[PATCH] serial: 8250_dw: Add DMA support for non-ACPI platforms

[PATCH] serial: 8250_dw: Add DMA support for non-ACPI platforms

[Ray Jui]

The dma pointer under struct uart_8250_port is currently left
unassigned for non-ACPI platforms. It should be pointing to the dma
member in struct dw8250_data like how it was done for ACPI, so the core
8250 code will try to request for DMA when registering the port

If DMA is not enabled in device tree, request DMA will fail and the
driver will fall back to PIO

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: JD (Jiandong) Zheng <jdzheng@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Tested-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/tty/serial/8250/8250_dw.c |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index 4db7987..1038ea8 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -293,6 +293,14 @@ static int dw8250_probe_of(struct uart_port *p,
 	if (has_ucv)
 		dw8250_setup_port(up);
 
+	/* if we have a valid fifosize, try hooking up DMA here */
+	if (p->fifosize) {
+		up->dma = &data->dma;
+
+		up->dma->rxconf.src_maxburst = p->fifosize / 4;
+		up->dma->txconf.dst_maxburst = p->fifosize / 4;
+	}
+
 	if (!of_property_read_u32(np, "reg-shift", &val))
 		p->regshift = val;
 
-- 
1.7.9.5

[PATCH] serial: 8250_dw: Add DMA support for non-ACPI platforms

[Ray Jui]

The dma pointer under struct uart_8250_port is currently left
unassigned for non-ACPI platforms. It should be pointing to the dma
member in struct dw8250_data like how it was done for ACPI, so the core
8250 code will try to request for DMA when registering the port

If DMA is not enabled in device tree, request DMA will fail and the
driver will fall back to PIO

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: JD (Jiandong) Zheng <jdzheng@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Tested-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/tty/serial/8250/8250_dw.c |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index 4db7987..1038ea8 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -293,6 +293,14 @@ static int dw8250_probe_of(struct uart_port *p,
 	if (has_ucv)
 		dw8250_setup_port(up);
 
+	/* if we have a valid fifosize, try hooking up DMA here */
+	if (p->fifosize) {
+		up->dma = &data->dma;
+
+		up->dma->rxconf.src_maxburst = p->fifosize / 4;
+		up->dma->txconf.dst_maxburst = p->fifosize / 4;
+	}
+
 	if (!of_property_read_u32(np, "reg-shift", &val))
 		p->regshift = val;
 
-- 
1.7.9.5

[PATCH] spi: pl022: Fix broken spidev when DMA is enabled

[Ray Jui]

The PL022 SPI driver maps the DMA RX buffer before the DMA TX buffer. In
most cases, the sequence of the mapping does not matter. But in cases
where TX and RX happen to use the same buffer, e.g., spidev, it causes
the cached TX data not written to memory, because the same memory has
been marked invalid when dma_map_sg on the RX buffer is called

The solution is to reverse the sequence so it maps the TX buffer before
the RX buffer

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: JD (Jiandong) Zheng <jdzheng@broadcom.com>
Tested-by: Scott Branden <sbranden@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/spi/spi-pl022.c |   20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/spi/spi-pl022.c b/drivers/spi/spi-pl022.c
index 1189cfd..edb7298 100644
--- a/drivers/spi/spi-pl022.c
+++ b/drivers/spi/spi-pl022.c
@@ -773,10 +773,10 @@ static void *next_transfer(struct pl022 *pl022)
 static void unmap_free_dma_scatter(struct pl022 *pl022)
 {
 	/* Unmap and free the SG tables */
-	dma_unmap_sg(pl022->dma_tx_channel->device->dev, pl022->sgt_tx.sgl,
-		     pl022->sgt_tx.nents, DMA_TO_DEVICE);
 	dma_unmap_sg(pl022->dma_rx_channel->device->dev, pl022->sgt_rx.sgl,
 		     pl022->sgt_rx.nents, DMA_FROM_DEVICE);
+	dma_unmap_sg(pl022->dma_tx_channel->device->dev, pl022->sgt_tx.sgl,
+		     pl022->sgt_tx.nents, DMA_TO_DEVICE);
 	sg_free_table(&pl022->sgt_rx);
 	sg_free_table(&pl022->sgt_tx);
 }
@@ -1026,16 +1026,16 @@ static int configure_dma(struct pl022 *pl022)
 			  pl022->cur_transfer->len, &pl022->sgt_tx);
 
 	/* Map DMA buffers */
-	rx_sglen = dma_map_sg(rxchan->device->dev, pl022->sgt_rx.sgl,
-			   pl022->sgt_rx.nents, DMA_FROM_DEVICE);
-	if (!rx_sglen)
-		goto err_rx_sgmap;
-
 	tx_sglen = dma_map_sg(txchan->device->dev, pl022->sgt_tx.sgl,
 			   pl022->sgt_tx.nents, DMA_TO_DEVICE);
 	if (!tx_sglen)
 		goto err_tx_sgmap;
 
+	rx_sglen = dma_map_sg(rxchan->device->dev, pl022->sgt_rx.sgl,
+			   pl022->sgt_rx.nents, DMA_FROM_DEVICE);
+	if (!rx_sglen)
+		goto err_rx_sgmap;
+
 	/* Send both scatterlists */
 	rxdesc = dmaengine_prep_slave_sg(rxchan,
 				      pl022->sgt_rx.sgl,
@@ -1070,12 +1070,12 @@ err_txdesc:
 	dmaengine_terminate_all(txchan);
 err_rxdesc:
 	dmaengine_terminate_all(rxchan);
+	dma_unmap_sg(rxchan->device->dev, pl022->sgt_rx.sgl,
+		     pl022->sgt_rx.nents, DMA_FROM_DEVICE);
+err_rx_sgmap:
 	dma_unmap_sg(txchan->device->dev, pl022->sgt_tx.sgl,
 		     pl022->sgt_tx.nents, DMA_TO_DEVICE);
 err_tx_sgmap:
-	dma_unmap_sg(rxchan->device->dev, pl022->sgt_rx.sgl,
-		     pl022->sgt_tx.nents, DMA_FROM_DEVICE);
-err_rx_sgmap:
 	sg_free_table(&pl022->sgt_tx);
 err_alloc_tx_sg:
 	sg_free_table(&pl022->sgt_rx);
-- 
1.7.9.5

[PATCH] spi: pl022: Fix broken spidev when DMA is enabled

[Ray Jui]

The PL022 SPI driver maps the DMA RX buffer before the DMA TX buffer. In
most cases, the sequence of the mapping does not matter. But in cases
where TX and RX happen to use the same buffer, e.g., spidev, it causes
the cached TX data not written to memory, because the same memory has
been marked invalid when dma_map_sg on the RX buffer is called

The solution is to reverse the sequence so it maps the TX buffer before
the RX buffer

Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
Reviewed-by: JD (Jiandong) Zheng <jdzheng-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
Tested-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
---
 drivers/spi/spi-pl022.c |   20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/spi/spi-pl022.c b/drivers/spi/spi-pl022.c
index 1189cfd..edb7298 100644
--- a/drivers/spi/spi-pl022.c
+++ b/drivers/spi/spi-pl022.c
@@ -773,10 +773,10 @@ static void *next_transfer(struct pl022 *pl022)
 static void unmap_free_dma_scatter(struct pl022 *pl022)
 {
 	/* Unmap and free the SG tables */
-	dma_unmap_sg(pl022->dma_tx_channel->device->dev, pl022->sgt_tx.sgl,
-		     pl022->sgt_tx.nents, DMA_TO_DEVICE);
 	dma_unmap_sg(pl022->dma_rx_channel->device->dev, pl022->sgt_rx.sgl,
 		     pl022->sgt_rx.nents, DMA_FROM_DEVICE);
+	dma_unmap_sg(pl022->dma_tx_channel->device->dev, pl022->sgt_tx.sgl,
+		     pl022->sgt_tx.nents, DMA_TO_DEVICE);
 	sg_free_table(&pl022->sgt_rx);
 	sg_free_table(&pl022->sgt_tx);
 }
@@ -1026,16 +1026,16 @@ static int configure_dma(struct pl022 *pl022)
 			  pl022->cur_transfer->len, &pl022->sgt_tx);
 
 	/* Map DMA buffers */
-	rx_sglen = dma_map_sg(rxchan->device->dev, pl022->sgt_rx.sgl,
-			   pl022->sgt_rx.nents, DMA_FROM_DEVICE);
-	if (!rx_sglen)
-		goto err_rx_sgmap;
-
 	tx_sglen = dma_map_sg(txchan->device->dev, pl022->sgt_tx.sgl,
 			   pl022->sgt_tx.nents, DMA_TO_DEVICE);
 	if (!tx_sglen)
 		goto err_tx_sgmap;
 
+	rx_sglen = dma_map_sg(rxchan->device->dev, pl022->sgt_rx.sgl,
+			   pl022->sgt_rx.nents, DMA_FROM_DEVICE);
+	if (!rx_sglen)
+		goto err_rx_sgmap;
+
 	/* Send both scatterlists */
 	rxdesc = dmaengine_prep_slave_sg(rxchan,
 				      pl022->sgt_rx.sgl,
@@ -1070,12 +1070,12 @@ err_txdesc:
 	dmaengine_terminate_all(txchan);
 err_rxdesc:
 	dmaengine_terminate_all(rxchan);
+	dma_unmap_sg(rxchan->device->dev, pl022->sgt_rx.sgl,
+		     pl022->sgt_rx.nents, DMA_FROM_DEVICE);
+err_rx_sgmap:
 	dma_unmap_sg(txchan->device->dev, pl022->sgt_tx.sgl,
 		     pl022->sgt_tx.nents, DMA_TO_DEVICE);
 err_tx_sgmap:
-	dma_unmap_sg(rxchan->device->dev, pl022->sgt_rx.sgl,
-		     pl022->sgt_tx.nents, DMA_FROM_DEVICE);
-err_rx_sgmap:
 	sg_free_table(&pl022->sgt_tx);
 err_alloc_tx_sg:
 	sg_free_table(&pl022->sgt_rx);
-- 
1.7.9.5

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Re: [PATCH] spi: pl022: Fix broken spidev when DMA is enabled

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 623 bytes --]

On Tue, Oct 07, 2014 at 09:38:47PM -0700, Ray Jui wrote:

> The PL022 SPI driver maps the DMA RX buffer before the DMA TX buffer. In
> most cases, the sequence of the mapping does not matter. But in cases
> where TX and RX happen to use the same buffer, e.g., spidev, it causes
> the cached TX data not written to memory, because the same memory has
> been marked invalid when dma_map_sg on the RX buffer is called

This seems like it is a bug in spidev, using the same buffer simultaneously
for both directions isn't something I'd think would be expected to work
reliably unless it was explicitly mapped as bidirectional.

[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 473 bytes --]

Re: [PATCH] spi: pl022: Fix broken spidev when DMA is enabled

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 623 bytes --]

On Tue, Oct 07, 2014 at 09:38:47PM -0700, Ray Jui wrote:

> The PL022 SPI driver maps the DMA RX buffer before the DMA TX buffer. In
> most cases, the sequence of the mapping does not matter. But in cases
> where TX and RX happen to use the same buffer, e.g., spidev, it causes
> the cached TX data not written to memory, because the same memory has
> been marked invalid when dma_map_sg on the RX buffer is called

This seems like it is a bug in spidev, using the same buffer simultaneously
for both directions isn't something I'd think would be expected to work
reliably unless it was explicitly mapped as bidirectional.

[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 473 bytes --]

Re: [PATCH] spi: pl022: Fix broken spidev when DMA is enabled

[Ray Jui]

On 10/8/2014 4:21 AM, Mark Brown wrote:
> On Tue, Oct 07, 2014 at 09:38:47PM -0700, Ray Jui wrote:
>
>> The PL022 SPI driver maps the DMA RX buffer before the DMA TX buffer. In
>> most cases, the sequence of the mapping does not matter. But in cases
>> where TX and RX happen to use the same buffer, e.g., spidev, it causes
>> the cached TX data not written to memory, because the same memory has
>> been marked invalid when dma_map_sg on the RX buffer is called
>
> This seems like it is a bug in spidev, using the same buffer simultaneously
> for both directions isn't something I'd think would be expected to work
> reliably unless it was explicitly mapped as bidirectional.
>
Hi Mark,

Thanks for the reply. It looks like you are also the maintainer of 
spidev. In this case, could you please help to confirm that you expect 
spidev to use separate buffers for TX and RX? If so, I can go ahead and 
make the change in spidev.

+ Grant

Thanks,

Ray

Re: [PATCH] spi: pl022: Fix broken spidev when DMA is enabled

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 481 bytes --]

On Wed, Oct 08, 2014 at 09:14:35AM -0700, Ray Jui wrote:

> Thanks for the reply. It looks like you are also the maintainer of spidev.
> In this case, could you please help to confirm that you expect spidev to use
> separate buffers for TX and RX? If so, I can go ahead and make the change in
> spidev.

Yes, that would be my expectation for maximum robustness (or if it is
going to use one buffer it explicitly maps it for mixed use but I'd
expect that to be asking for trouble).

[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 473 bytes --]

Re: [PATCH] spi: pl022: Fix broken spidev when DMA is enabled

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 481 bytes --]

On Wed, Oct 08, 2014 at 09:14:35AM -0700, Ray Jui wrote:

> Thanks for the reply. It looks like you are also the maintainer of spidev.
> In this case, could you please help to confirm that you expect spidev to use
> separate buffers for TX and RX? If so, I can go ahead and make the change in
> spidev.

Yes, that would be my expectation for maximum robustness (or if it is
going to use one buffer it explicitly maps it for mixed use but I'd
expect that to be asking for trouble).

[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 473 bytes --]

Re: [PATCH] spi: pl022: Fix broken spidev when DMA is enabled

[Ray Jui]

On 10/8/2014 11:21 AM, Mark Brown wrote:
> On Wed, Oct 08, 2014 at 09:14:35AM -0700, Ray Jui wrote:
>
>> Thanks for the reply. It looks like you are also the maintainer of spidev.
>> In this case, could you please help to confirm that you expect spidev to use
>> separate buffers for TX and RX? If so, I can go ahead and make the change in
>> spidev.
>
> Yes, that would be my expectation for maximum robustness (or if it is
> going to use one buffer it explicitly maps it for mixed use but I'd
> expect that to be asking for trouble).
>
Okay, Mark. I'm going to make the change in the spidev and submit a new 
patch.

Thanks for the feedback.

Ray

Re: [PATCH] spi: pl022: Fix broken spidev when DMA is enabled

[Ray Jui]

On 10/8/2014 11:21 AM, Mark Brown wrote:
> On Wed, Oct 08, 2014 at 09:14:35AM -0700, Ray Jui wrote:
>
>> Thanks for the reply. It looks like you are also the maintainer of spidev.
>> In this case, could you please help to confirm that you expect spidev to use
>> separate buffers for TX and RX? If so, I can go ahead and make the change in
>> spidev.
>
> Yes, that would be my expectation for maximum robustness (or if it is
> going to use one buffer it explicitly maps it for mixed use but I'd
> expect that to be asking for trouble).
>
Okay, Mark. I'm going to make the change in the spidev and submit a new 
patch.

Thanks for the feedback.

Ray
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Re: [PATCH] serial: 8250_dw: Add DMA support for non-ACPI platforms

[Heikki Krogerus]

On Tue, Oct 07, 2014 at 05:35:47PM -0700, Ray Jui wrote:
> The dma pointer under struct uart_8250_port is currently left
> unassigned for non-ACPI platforms. It should be pointing to the dma
> member in struct dw8250_data like how it was done for ACPI, so the core
> 8250 code will try to request for DMA when registering the port
> 
> If DMA is not enabled in device tree, request DMA will fail and the
> driver will fall back to PIO
> 
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: JD (Jiandong) Zheng <jdzheng@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> Tested-by: Scott Branden <sbranden@broadcom.com>

OK by me. FWIW..

Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>


-- 
heikki

Re: [PATCH] spi: pl022: Fix broken spidev when DMA is enabled

[Geert Uytterhoeven]

On Wed, Oct 8, 2014 at 8:21 PM, Mark Brown <broonie@kernel.org> wrote:
> On Wed, Oct 08, 2014 at 09:14:35AM -0700, Ray Jui wrote:
>> Thanks for the reply. It looks like you are also the maintainer of spidev.
>> In this case, could you please help to confirm that you expect spidev to use
>> separate buffers for TX and RX? If so, I can go ahead and make the change in
>> spidev.
>
> Yes, that would be my expectation for maximum robustness (or if it is
> going to use one buffer it explicitly maps it for mixed use but I'd
> expect that to be asking for trouble).

Having two separate buffers avoids false successes when running
"spidev_test --loop" on a buggy SPI master driver.
Been there, done that ;-)

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: [PATCH] spi: pl022: Fix broken spidev when DMA is enabled

[Geert Uytterhoeven]

On Wed, Oct 8, 2014 at 8:21 PM, Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> wrote:
> On Wed, Oct 08, 2014 at 09:14:35AM -0700, Ray Jui wrote:
>> Thanks for the reply. It looks like you are also the maintainer of spidev.
>> In this case, could you please help to confirm that you expect spidev to use
>> separate buffers for TX and RX? If so, I can go ahead and make the change in
>> spidev.
>
> Yes, that would be my expectation for maximum robustness (or if it is
> going to use one buffer it explicitly maps it for mixed use but I'd
> expect that to be asking for trouble).

Having two separate buffers avoids false successes when running
"spidev_test --loop" on a buggy SPI master driver.
Been there, done that ;-)

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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[PATCH] spi: spidev: Use separate TX and RX bounce buffers

[Ray Jui]

By using separate TX and RX bounce buffers, we avoid potential cache
flush and invalidation sequence issue that may be encountered when a
single bounce buffer is shared between TX and RX

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: JD (Jiandong) Zheng <jdzheng@broadcom.com>
---
 drivers/spi/spidev.c |   79 +++++++++++++++++++++++++++++++++-----------------
 1 file changed, 52 insertions(+), 27 deletions(-)

diff --git a/drivers/spi/spidev.c b/drivers/spi/spidev.c
index e3bc23b..e50039f 100644
--- a/drivers/spi/spidev.c
+++ b/drivers/spi/spidev.c
@@ -82,10 +82,11 @@ struct spidev_data {
 	struct spi_device	*spi;
 	struct list_head	device_entry;
 
-	/* buffer is NULL unless this device is open (users > 0) */
+	/* TX/RX buffers are NULL unless this device is open (users > 0) */
 	struct mutex		buf_lock;
 	unsigned		users;
-	u8			*buffer;
+	u8			*tx_buffer;
+	u8			*rx_buffer;
 };
 
 static LIST_HEAD(device_list);
@@ -135,7 +136,7 @@ static inline ssize_t
 spidev_sync_write(struct spidev_data *spidev, size_t len)
 {
 	struct spi_transfer	t = {
-			.tx_buf		= spidev->buffer,
+			.tx_buf		= spidev->tx_buffer,
 			.len		= len,
 		};
 	struct spi_message	m;
@@ -149,7 +150,7 @@ static inline ssize_t
 spidev_sync_read(struct spidev_data *spidev, size_t len)
 {
 	struct spi_transfer	t = {
-			.rx_buf		= spidev->buffer,
+			.rx_buf		= spidev->rx_buffer,
 			.len		= len,
 		};
 	struct spi_message	m;
@@ -179,7 +180,7 @@ spidev_read(struct file *filp, char __user *buf, size_t count, loff_t *f_pos)
 	if (status > 0) {
 		unsigned long	missing;
 
-		missing = copy_to_user(buf, spidev->buffer, status);
+		missing = copy_to_user(buf, spidev->rx_buffer, status);
 		if (missing == status)
 			status = -EFAULT;
 		else
@@ -206,7 +207,7 @@ spidev_write(struct file *filp, const char __user *buf,
 	spidev = filp->private_data;
 
 	mutex_lock(&spidev->buf_lock);
-	missing = copy_from_user(spidev->buffer, buf, count);
+	missing = copy_from_user(spidev->tx_buffer, buf, count);
 	if (missing == 0)
 		status = spidev_sync_write(spidev, count);
 	else
@@ -224,7 +225,7 @@ static int spidev_message(struct spidev_data *spidev,
 	struct spi_transfer	*k_tmp;
 	struct spi_ioc_transfer *u_tmp;
 	unsigned		n, total;
-	u8			*buf;
+	u8			*tx_buf, *rx_buf;
 	int			status = -EFAULT;
 
 	spi_message_init(&msg);
@@ -236,7 +237,8 @@ static int spidev_message(struct spidev_data *spidev,
 	 * We walk the array of user-provided transfers, using each one
 	 * to initialize a kernel version of the same transfer.
 	 */
-	buf = spidev->buffer;
+	tx_buf = spidev->tx_buffer;
+	rx_buf = spidev->rx_buffer;
 	total = 0;
 	for (n = n_xfers, k_tmp = k_xfers, u_tmp = u_xfers;
 			n;
@@ -250,20 +252,21 @@ static int spidev_message(struct spidev_data *spidev,
 		}
 
 		if (u_tmp->rx_buf) {
-			k_tmp->rx_buf = buf;
+			k_tmp->rx_buf = rx_buf;
 			if (!access_ok(VERIFY_WRITE, (u8 __user *)
 						(uintptr_t) u_tmp->rx_buf,
 						u_tmp->len))
 				goto done;
 		}
 		if (u_tmp->tx_buf) {
-			k_tmp->tx_buf = buf;
-			if (copy_from_user(buf, (const u8 __user *)
+			k_tmp->tx_buf = tx_buf;
+			if (copy_from_user(tx_buf, (const u8 __user *)
 						(uintptr_t) u_tmp->tx_buf,
 					u_tmp->len))
 				goto done;
 		}
-		buf += k_tmp->len;
+		tx_buf += k_tmp->len;
+		rx_buf += k_tmp->len;
 
 		k_tmp->cs_change = !!u_tmp->cs_change;
 		k_tmp->tx_nbits = u_tmp->tx_nbits;
@@ -290,17 +293,17 @@ static int spidev_message(struct spidev_data *spidev,
 		goto done;
 
 	/* copy any rx data out of bounce buffer */
-	buf = spidev->buffer;
+	rx_buf = spidev->rx_buffer;
 	for (n = n_xfers, u_tmp = u_xfers; n; n--, u_tmp++) {
 		if (u_tmp->rx_buf) {
 			if (__copy_to_user((u8 __user *)
-					(uintptr_t) u_tmp->rx_buf, buf,
+					(uintptr_t) u_tmp->rx_buf, rx_buf,
 					u_tmp->len)) {
 				status = -EFAULT;
 				goto done;
 			}
 		}
-		buf += u_tmp->len;
+		rx_buf += u_tmp->len;
 	}
 	status = total;
 
@@ -508,22 +511,41 @@ static int spidev_open(struct inode *inode, struct file *filp)
 			break;
 		}
 	}
-	if (status == 0) {
-		if (!spidev->buffer) {
-			spidev->buffer = kmalloc(bufsiz, GFP_KERNEL);
-			if (!spidev->buffer) {
+
+	if (status) {
+		pr_debug("spidev: nothing for minor %d\n", iminor(inode));
+		goto err_find_dev;
+	}
+
+	if (!spidev->tx_buffer) {
+		spidev->tx_buffer = kmalloc(bufsiz, GFP_KERNEL);
+		if (!spidev->tx_buffer) {
 				dev_dbg(&spidev->spi->dev, "open/ENOMEM\n");
 				status = -ENOMEM;
+			goto err_find_dev;
 			}
 		}
-		if (status == 0) {
-			spidev->users++;
-			filp->private_data = spidev;
-			nonseekable_open(inode, filp);
+
+	if (!spidev->rx_buffer) {
+		spidev->rx_buffer = kmalloc(bufsiz, GFP_KERNEL);
+		if (!spidev->rx_buffer) {
+			dev_dbg(&spidev->spi->dev, "open/ENOMEM\n");
+			status = -ENOMEM;
+			goto err_alloc_rx_buf;
 		}
-	} else
-		pr_debug("spidev: nothing for minor %d\n", iminor(inode));
+	}
+
+	spidev->users++;
+	filp->private_data = spidev;
+	nonseekable_open(inode, filp);
+
+	mutex_unlock(&device_list_lock);
+	return 0;
 
+err_alloc_rx_buf:
+	kfree(spidev->tx_buffer);
+	spidev->tx_buffer = NULL;
+err_find_dev:
 	mutex_unlock(&device_list_lock);
 	return status;
 }
@@ -542,8 +564,11 @@ static int spidev_release(struct inode *inode, struct file *filp)
 	if (!spidev->users) {
 		int		dofree;
 
-		kfree(spidev->buffer);
-		spidev->buffer = NULL;
+		kfree(spidev->tx_buffer);
+		spidev->tx_buffer = NULL;
+
+		kfree(spidev->rx_buffer);
+		spidev->rx_buffer = NULL;
 
 		/* ... after we unbound from the underlying device? */
 		spin_lock_irq(&spidev->spi_lock);
-- 
1.7.9.5

[PATCH] spi: pl022: Fix incorrect dma_unmap_sg

[Ray Jui]

When mapped RX DMA entries are unmapped in an error condition when DMA
is firstly configured in the driver, the number of TX DMA entries was
passed in, which is incorrect

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 drivers/spi/spi-pl022.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/spi/spi-pl022.c b/drivers/spi/spi-pl022.c
index f35f723..fc2dd84 100644
--- a/drivers/spi/spi-pl022.c
+++ b/drivers/spi/spi-pl022.c
@@ -1106,7 +1106,7 @@ err_rxdesc:
 		     pl022->sgt_tx.nents, DMA_TO_DEVICE);
 err_tx_sgmap:
 	dma_unmap_sg(rxchan->device->dev, pl022->sgt_rx.sgl,
-		     pl022->sgt_tx.nents, DMA_FROM_DEVICE);
+		     pl022->sgt_rx.nents, DMA_FROM_DEVICE);
 err_rx_sgmap:
 	sg_free_table(&pl022->sgt_tx);
 err_alloc_tx_sg:
-- 
1.7.9.5

[PATCH] spi: pl022: Fix incorrect dma_unmap_sg

[Ray Jui]

When mapped RX DMA entries are unmapped in an error condition when DMA
is firstly configured in the driver, the number of TX DMA entries was
passed in, which is incorrect

Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
---
 drivers/spi/spi-pl022.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/spi/spi-pl022.c b/drivers/spi/spi-pl022.c
index f35f723..fc2dd84 100644
--- a/drivers/spi/spi-pl022.c
+++ b/drivers/spi/spi-pl022.c
@@ -1106,7 +1106,7 @@ err_rxdesc:
 		     pl022->sgt_tx.nents, DMA_TO_DEVICE);
 err_tx_sgmap:
 	dma_unmap_sg(rxchan->device->dev, pl022->sgt_rx.sgl,
-		     pl022->sgt_tx.nents, DMA_FROM_DEVICE);
+		     pl022->sgt_rx.nents, DMA_FROM_DEVICE);
 err_rx_sgmap:
 	sg_free_table(&pl022->sgt_tx);
 err_alloc_tx_sg:
-- 
1.7.9.5

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Re: [PATCH] spi: spidev: Use separate TX and RX bounce buffers

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 268 bytes --]

On Thu, Oct 09, 2014 at 11:19:25AM -0700, Ray Jui wrote:
> By using separate TX and RX bounce buffers, we avoid potential cache
> flush and invalidation sequence issue that may be encountered when a
> single bounce buffer is shared between TX and RX

Applied, thanks.

[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 473 bytes --]

Re: [PATCH] spi: spidev: Use separate TX and RX bounce buffers

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 268 bytes --]

On Thu, Oct 09, 2014 at 11:19:25AM -0700, Ray Jui wrote:
> By using separate TX and RX bounce buffers, we avoid potential cache
> flush and invalidation sequence issue that may be encountered when a
> single bounce buffer is shared between TX and RX

Applied, thanks.

[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 473 bytes --]

Re: [PATCH] spi: pl022: Fix incorrect dma_unmap_sg

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 252 bytes --]

On Thu, Oct 09, 2014 at 11:44:54AM -0700, Ray Jui wrote:
> When mapped RX DMA entries are unmapped in an error condition when DMA
> is firstly configured in the driver, the number of TX DMA entries was
> passed in, which is incorrect

Applied, thanks.

[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 473 bytes --]

Re: [PATCH] spi: pl022: Fix incorrect dma_unmap_sg

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 252 bytes --]

On Thu, Oct 09, 2014 at 11:44:54AM -0700, Ray Jui wrote:
> When mapped RX DMA entries are unmapped in an error condition when DMA
> is firstly configured in the driver, the number of TX DMA entries was
> passed in, which is incorrect

Applied, thanks.

[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 473 bytes --]

Re: [PATCH] spi: spidev: Use separate TX and RX bounce buffers

[Ray Jui]

On 10/13/2014 4:07 AM, Mark Brown wrote:
> On Thu, Oct 09, 2014 at 11:19:25AM -0700, Ray Jui wrote:
>> By using separate TX and RX bounce buffers, we avoid potential cache
>> flush and invalidation sequence issue that may be encountered when a
>> single bounce buffer is shared between TX and RX
>
> Applied, thanks.
>
Thanks, Mark.

Re: [PATCH] spi: spidev: Use separate TX and RX bounce buffers

[Ray Jui]

On 10/13/2014 4:07 AM, Mark Brown wrote:
> On Thu, Oct 09, 2014 at 11:19:25AM -0700, Ray Jui wrote:
>> By using separate TX and RX bounce buffers, we avoid potential cache
>> flush and invalidation sequence issue that may be encountered when a
>> single bounce buffer is shared between TX and RX
>
> Applied, thanks.
>
Thanks, Mark.
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Re: [PATCH] spi: pl022: Fix incorrect dma_unmap_sg

[Ray Jui]

On 10/13/2014 4:08 AM, Mark Brown wrote:
> On Thu, Oct 09, 2014 at 11:44:54AM -0700, Ray Jui wrote:
>> When mapped RX DMA entries are unmapped in an error condition when DMA
>> is firstly configured in the driver, the number of TX DMA entries was
>> passed in, which is incorrect
>
> Applied, thanks.
>
Thanks, Mark.

Re: [PATCH] spi: pl022: Fix incorrect dma_unmap_sg

[Ray Jui]

On 10/13/2014 4:08 AM, Mark Brown wrote:
> On Thu, Oct 09, 2014 at 11:44:54AM -0700, Ray Jui wrote:
>> When mapped RX DMA entries are unmapped in an error condition when DMA
>> is firstly configured in the driver, the number of TX DMA entries was
>> passed in, which is incorrect
>
> Applied, thanks.
>
Thanks, Mark.
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[PATCH] dmaengine: pl330: use subsys_initcall

[Ray Jui]

As part of subsystem that many slave drivers depend on, it's more
appropriate for the pl330 DMA driver to be initialized at
subsys_initcall than device_initcall

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 drivers/dma/pl330.c |   12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index d5149aa..abb4cae 100644
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -2811,7 +2811,17 @@ static struct amba_driver pl330_driver = {
 	.remove = pl330_remove,
 };
 
-module_amba_driver(pl330_driver);
+static int __init pl330_init(void)
+{
+	return amba_driver_register(&pl330_driver);
+}
+subsys_initcall(pl330_init);
+
+static void __exit pl330_exit(void)
+{
+	amba_driver_unregister(&pl330_driver);
+}
+module_exit(pl330_exit);
 
 MODULE_AUTHOR("Jaswinder Singh <jassi.brar@samsung.com>");
 MODULE_DESCRIPTION("API Driver for PL330 DMAC");
-- 
1.7.9.5

Re: [PATCH] dmaengine: pl330: use subsys_initcall

[Vinod Koul]

On Fri, Oct 17, 2014 at 09:45:45AM +0200, Lars-Peter Clausen wrote:
> On 10/17/2014 02:48 AM, Ray Jui wrote:
> >As part of subsystem that many slave drivers depend on, it's more
> >appropriate for the pl330 DMA driver to be initialized at
> >subsys_initcall than device_initcall
> 
> Well, we do have -EPROBE_DEFER these days to handle these kinds of
> dependencies so we no longer have to these kinds of manual init
> reordering tricks.
How ould that work?

Consider for example SPI and dmanegine. SPI driver got probed, then to start
a transaction requested a channel... while dmaengine driver is still getting
probed/not probed yet. So SPI driver didnt get a channel.

-- 
~Vinod

Re: [PATCH] dmaengine: pl330: use subsys_initcall

[Lars-Peter Clausen]

On 10/17/2014 02:48 AM, Ray Jui wrote:
> As part of subsystem that many slave drivers depend on, it's more
> appropriate for the pl330 DMA driver to be initialized at
> subsys_initcall than device_initcall

Well, we do have -EPROBE_DEFER these days to handle these kinds of 
dependencies so we no longer have to these kinds of manual init reordering 
tricks.

- Lars

Re: [PATCH] dmaengine: pl330: use subsys_initcall

[Krzysztof Kozłowski]

On 17.10.2014 02:48, Ray Jui wrote:
> As part of subsystem that many slave drivers depend on, it's more
> appropriate for the pl330 DMA driver to be initialized at
> subsys_initcall than device_initcall
> 
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> ---
>  drivers/dma/pl330.c |   12 +++++++++++-
>  1 file changed, 11 insertions(+), 1 deletion(-)

For our setup this was not needed but anyway works fine.
Tested on Trats2 (Exynos4412) and Gear2 (Exynos3250).

Tested-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>

Best regards,
Krzysztof

> 
> diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
> index d5149aa..abb4cae 100644
> --- a/drivers/dma/pl330.c
> +++ b/drivers/dma/pl330.c
> @@ -2811,7 +2811,17 @@ static struct amba_driver pl330_driver = {
>  	.remove = pl330_remove,
>  };
>  
> -module_amba_driver(pl330_driver);
> +static int __init pl330_init(void)
> +{
> +	return amba_driver_register(&pl330_driver);
> +}
> +subsys_initcall(pl330_init);
> +
> +static void __exit pl330_exit(void)
> +{
> +	amba_driver_unregister(&pl330_driver);
> +}
> +module_exit(pl330_exit);
>  
>  MODULE_AUTHOR("Jaswinder Singh <jassi.brar@samsung.com>");
>  MODULE_DESCRIPTION("API Driver for PL330 DMAC");
> 

Re: [PATCH] dmaengine: pl330: use subsys_initcall

[Lars-Peter Clausen]

On 10/17/2014 09:35 AM, Vinod Koul wrote:
> On Fri, Oct 17, 2014 at 09:45:45AM +0200, Lars-Peter Clausen wrote:
>> On 10/17/2014 02:48 AM, Ray Jui wrote:
>>> As part of subsystem that many slave drivers depend on, it's more
>>> appropriate for the pl330 DMA driver to be initialized at
>>> subsys_initcall than device_initcall
>>
>> Well, we do have -EPROBE_DEFER these days to handle these kinds of
>> dependencies so we no longer have to these kinds of manual init
>> reordering tricks.
> How ould that work?
>
> Consider for example SPI and dmanegine. SPI driver got probed, then to start
> a transaction requested a channel... while dmaengine driver is still getting
> probed/not probed yet. So SPI driver didnt get a channel.
>

Ideally the SPI driver requests the channel in probe function and if the DMA 
controller is not yet probed returns EPROBE_DEFER. If the SPI driver 
requests the channel in the transfer handler it needs to deal with being 
able to fall back to non DMA transfers anyway so this shouldn't be a problem.

But in any case fiddling around with the init sequences is just a quick hack 
and might makes the problem less likely to appear in some cases, but there 
is no guarantee that it works. And I think the proper solution at the moment 
is to use probe deferral.

Other subsystems have seen patches which moved drivers from using 
subsys_initcall to device_initcall/module_..._driver/ with the reasoning 
that this is no longer necessary because of EPROBE_DEFER. So I don't think 
we should be doing the exact opposite in DMA framework. Also if we'd apply 
this patch it won't take to long until somebody suggest going back to 
module_platform_driver() instead of subsys_initcall.

- Lars

Re: [PATCH] dmaengine: pl330: use subsys_initcall

[Ray Jui]

On 10/17/2014 4:15 AM, Lars-Peter Clausen wrote:
> On 10/17/2014 09:35 AM, Vinod Koul wrote:
>> On Fri, Oct 17, 2014 at 09:45:45AM +0200, Lars-Peter Clausen wrote:
>>> On 10/17/2014 02:48 AM, Ray Jui wrote:
>>>> As part of subsystem that many slave drivers depend on, it's more
>>>> appropriate for the pl330 DMA driver to be initialized at
>>>> subsys_initcall than device_initcall
>>>
>>> Well, we do have -EPROBE_DEFER these days to handle these kinds of
>>> dependencies so we no longer have to these kinds of manual init
>>> reordering tricks.
>> How ould that work?
>>
>> Consider for example SPI and dmanegine. SPI driver got probed, then to
>> start
>> a transaction requested a channel... while dmaengine driver is still
>> getting
>> probed/not probed yet. So SPI driver didnt get a channel.
>>
>
> Ideally the SPI driver requests the channel in probe function and if the
> DMA controller is not yet probed returns EPROBE_DEFER. If the SPI driver
> requests the channel in the transfer handler it needs to deal with being
> able to fall back to non DMA transfers anyway so this shouldn't be a
> problem.
So in the case of the spi-pl022 driver. It requests the channel in probe 
function. And obviously DMA is not mandatory, so when the channel 
request fails the probe won't fail and instead it falls back to PIO. In 
this case, can you recommend a different way to solve this problem 
without having the DMA driver probed earlier than its slaves?

>
> But in any case fiddling around with the init sequences is just a quick
> hack and might makes the problem less likely to appear in some cases,
> but there is no guarantee that it works. And I think the proper solution
> at the moment is to use probe deferral.
I think it makes sense to have the DMA driver, as one of the core 
components in various SoCs that a lot of peripheral drivers depend on, 
to be registered at the level of subsys_init or somewhere close. We are 
not changing this just to get SPI to work. We are changing this because 
we think DMA should be ready before a lot of its slaves, which are 
typically done at device_initcall.

I have no problem relying on EPROBE_DEFER for this, provided that it 
works. The issue is, like I mentioned above, for a lot of slave devices 
DMA is not mandatory, when DMA fails at probe they would fall back to 
PIO and never use DMA. Another disadvantage I see with EPROBE_DEFER is 
delayed boot time.

>
> Other subsystems have seen patches which moved drivers from using
> subsys_initcall to device_initcall/module_..._driver/ with the reasoning
> that this is no longer necessary because of EPROBE_DEFER. So I don't
> think we should be doing the exact opposite in DMA framework. Also if
> we'd apply this patch it won't take to long until somebody suggest going
> back to module_platform_driver() instead of subsys_initcall.
>
> - Lars
There are currently 12 DMA drivers under drivers/dma registering 
themselves at subsys_init. I don't see why pl330 cannot do the same. Is 
there any concern that it may not work for some other SoCs when it's 
done at subsys_init? So far I cannot think of any. The only dependency 
of pl330 is the ARM apb_pclk, required during AMBA bus probe. But that's 
usually ready before subsys_init.

Thanks,

Ray

Re: [PATCH] dmaengine: pl330: use subsys_initcall

[Lars-Peter Clausen]

On 10/17/2014 06:18 PM, Ray Jui wrote:
> On 10/17/2014 4:15 AM, Lars-Peter Clausen wrote:
>> On 10/17/2014 09:35 AM, Vinod Koul wrote:
>>> On Fri, Oct 17, 2014 at 09:45:45AM +0200, Lars-Peter Clausen wrote:
>>>> On 10/17/2014 02:48 AM, Ray Jui wrote:
>>>>> As part of subsystem that many slave drivers depend on, it's more
>>>>> appropriate for the pl330 DMA driver to be initialized at
>>>>> subsys_initcall than device_initcall
>>>>
>>>> Well, we do have -EPROBE_DEFER these days to handle these kinds of
>>>> dependencies so we no longer have to these kinds of manual init
>>>> reordering tricks.
>>> How ould that work?
>>>
>>> Consider for example SPI and dmanegine. SPI driver got probed, then to
>>> start
>>> a transaction requested a channel... while dmaengine driver is still
>>> getting
>>> probed/not probed yet. So SPI driver didnt get a channel.
>>>
>>
>> Ideally the SPI driver requests the channel in probe function and if the
>> DMA controller is not yet probed returns EPROBE_DEFER. If the SPI driver
>> requests the channel in the transfer handler it needs to deal with being
>> able to fall back to non DMA transfers anyway so this shouldn't be a
>> problem.
> So in the case of the spi-pl022 driver. It requests the channel in probe
> function. And obviously DMA is not mandatory, so when the channel request
> fails the probe won't fail and instead it falls back to PIO. In this case,
> can you recommend a different way to solve this problem without having the
> DMA driver probed earlier than its slaves?


dma_request_slave_channel() has the problem that we can't differentiate 
between no channel provided and channel provided but the dma driver hasn't 
probed yet. The function will return NULL in both cases. But Stephen Warren 
added dma_request_slave_channel_reason() a while ago to solve this problem. 
This function returns a ERR_PTR. If it returns ERR_PTR(-EPROBE_DEFER) it 
means that a channel has been provided but the DMA driver hasn't probed yet. 
In this case the SPI driver should return -EPROBE_DEFER to try again later. 
If the function returns a different error code that means that it was not 
possible to get the DMA channel and it should fall back to PIO.

>
>>
>> But in any case fiddling around with the init sequences is just a quick
>> hack and might makes the problem less likely to appear in some cases,
>> but there is no guarantee that it works. And I think the proper solution
>> at the moment is to use probe deferral.
> I think it makes sense to have the DMA driver, as one of the core components
> in various SoCs that a lot of peripheral drivers depend on, to be registered
> at the level of subsys_init or somewhere close. We are not changing this
> just to get SPI to work. We are changing this because we think DMA should be
> ready before a lot of its slaves, which are typically done at device_initcall.

But if the DMA driver for example depends on a clock driver do you put the 
clock driver at a even earlier init level? The problem with using init 
levels for solving this problem is that there is only a small amount of init 
levels available and representing the dependency chains is neither possible 
with it nor were init level ever intended for solving this. EPROBE_DEFER on 
the other hand is.

>
> I have no problem relying on EPROBE_DEFER for this, provided that it works.
> The issue is, like I mentioned above, for a lot of slave devices DMA is not
> mandatory, when DMA fails at probe they would fall back to PIO and never use
> DMA. Another disadvantage I see with EPROBE_DEFER is delayed boot time.
>

Yea, the EPROBE_DEFER implementation is not ideal, but that is a problem 
that should be solved rather than working around it. I think there are 
patches somewhere for example that build a device dependency graph from the 
phandles in the devicetree and than probe devices in the correct order to 
reduce the number of times probe deferral is necessary.

>>
>> Other subsystems have seen patches which moved drivers from using
>> subsys_initcall to device_initcall/module_..._driver/ with the reasoning
>> that this is no longer necessary because of EPROBE_DEFER. So I don't
>> think we should be doing the exact opposite in DMA framework. Also if
>> we'd apply this patch it won't take to long until somebody suggest going
>> back to module_platform_driver() instead of subsys_initcall.
>>
>> - Lars
> There are currently 12 DMA drivers under drivers/dma registering themselves
> at subsys_init. I don't see why pl330 cannot do the same. Is there any
> concern that it may not work for some other SoCs when it's done at
> subsys_init? So far I cannot think of any. The only dependency of pl330 is
> the ARM apb_pclk, required during AMBA bus probe. But that's usually ready
> before subsys_init.

Those other drivers should be converted to device_initcall rather than 
converting the PL330 driver to subsys_init. Using subsys_init for device 
drivers is a hack which was used to try to solve ordering problems. But it 
doesn't work that great, especially if you have more than two devices in 
your dependency chain. The solution that people have come up with to solve 
this problem in a better way is probe deferral by the means of -EPROBE_DEFER.

- Lars

Re: [PATCH] dmaengine: pl330: use subsys_initcall

[Ray Jui]

On 10/17/2014 9:39 AM, Lars-Peter Clausen wrote:
> On 10/17/2014 06:18 PM, Ray Jui wrote:
>> On 10/17/2014 4:15 AM, Lars-Peter Clausen wrote:
>>> On 10/17/2014 09:35 AM, Vinod Koul wrote:
>>>> On Fri, Oct 17, 2014 at 09:45:45AM +0200, Lars-Peter Clausen wrote:
>>>>> On 10/17/2014 02:48 AM, Ray Jui wrote:
>>>>>> As part of subsystem that many slave drivers depend on, it's more
>>>>>> appropriate for the pl330 DMA driver to be initialized at
>>>>>> subsys_initcall than device_initcall
>>>>>
>>>>> Well, we do have -EPROBE_DEFER these days to handle these kinds of
>>>>> dependencies so we no longer have to these kinds of manual init
>>>>> reordering tricks.
>>>> How ould that work?
>>>>
>>>> Consider for example SPI and dmanegine. SPI driver got probed, then to
>>>> start
>>>> a transaction requested a channel... while dmaengine driver is still
>>>> getting
>>>> probed/not probed yet. So SPI driver didnt get a channel.
>>>>
>>>
>>> Ideally the SPI driver requests the channel in probe function and if the
>>> DMA controller is not yet probed returns EPROBE_DEFER. If the SPI driver
>>> requests the channel in the transfer handler it needs to deal with being
>>> able to fall back to non DMA transfers anyway so this shouldn't be a
>>> problem.
>> So in the case of the spi-pl022 driver. It requests the channel in probe
>> function. And obviously DMA is not mandatory, so when the channel request
>> fails the probe won't fail and instead it falls back to PIO. In this
>> case,
>> can you recommend a different way to solve this problem without having
>> the
>> DMA driver probed earlier than its slaves?
>
>
> dma_request_slave_channel() has the problem that we can't differentiate
> between no channel provided and channel provided but the dma driver
> hasn't probed yet. The function will return NULL in both cases. But
> Stephen Warren added dma_request_slave_channel_reason() a while ago to
> solve this problem. This function returns a ERR_PTR. If it returns
> ERR_PTR(-EPROBE_DEFER) it means that a channel has been provided but the
> DMA driver hasn't probed yet. In this case the SPI driver should return
> -EPROBE_DEFER to try again later. If the function returns a different
> error code that means that it was not possible to get the DMA channel
> and it should fall back to PIO.
>
Thanks for the information. This will solve our problem.

>>
>>>
>>> But in any case fiddling around with the init sequences is just a quick
>>> hack and might makes the problem less likely to appear in some cases,
>>> but there is no guarantee that it works. And I think the proper solution
>>> at the moment is to use probe deferral.
>> I think it makes sense to have the DMA driver, as one of the core
>> components
>> in various SoCs that a lot of peripheral drivers depend on, to be
>> registered
>> at the level of subsys_init or somewhere close. We are not changing this
>> just to get SPI to work. We are changing this because we think DMA
>> should be
>> ready before a lot of its slaves, which are typically done at
>> device_initcall.
>
> But if the DMA driver for example depends on a clock driver do you put
> the clock driver at a even earlier init level? The problem with using
> init levels for solving this problem is that there is only a small
> amount of init levels available and representing the dependency chains
> is neither possible with it nor were init level ever intended for
> solving this. EPROBE_DEFER on the other hand is.
>
>>
>> I have no problem relying on EPROBE_DEFER for this, provided that it
>> works.
>> The issue is, like I mentioned above, for a lot of slave devices DMA
>> is not
>> mandatory, when DMA fails at probe they would fall back to PIO and
>> never use
>> DMA. Another disadvantage I see with EPROBE_DEFER is delayed boot time.
>>
>
> Yea, the EPROBE_DEFER implementation is not ideal, but that is a problem
> that should be solved rather than working around it. I think there are
> patches somewhere for example that build a device dependency graph from
> the phandles in the devicetree and than probe devices in the correct
> order to reduce the number of times probe deferral is necessary.
>
Agreed. Yes, it would be very nice if we can eventually describe the 
dependencies of various components in a system by utilizing the device 
tree. This way the dependencies can be customized for each individual SoC.

>>>
>>> Other subsystems have seen patches which moved drivers from using
>>> subsys_initcall to device_initcall/module_..._driver/ with the reasoning
>>> that this is no longer necessary because of EPROBE_DEFER. So I don't
>>> think we should be doing the exact opposite in DMA framework. Also if
>>> we'd apply this patch it won't take to long until somebody suggest going
>>> back to module_platform_driver() instead of subsys_initcall.
>>>
>>> - Lars
>> There are currently 12 DMA drivers under drivers/dma registering
>> themselves
>> at subsys_init. I don't see why pl330 cannot do the same. Is there any
>> concern that it may not work for some other SoCs when it's done at
>> subsys_init? So far I cannot think of any. The only dependency of
>> pl330 is
>> the ARM apb_pclk, required during AMBA bus probe. But that's usually
>> ready
>> before subsys_init.
>
> Those other drivers should be converted to device_initcall rather than
> converting the PL330 driver to subsys_init. Using subsys_init for device
> drivers is a hack which was used to try to solve ordering problems. But
> it doesn't work that great, especially if you have more than two devices
> in your dependency chain. The solution that people have come up with to
> solve this problem in a better way is probe deferral by the means of
> -EPROBE_DEFER.
>
> - Lars
>
Thanks, Lars, for providing these information. They are very useful!

Ray

Re: [PATCH] dmaengine: pl330: use subsys_initcall

[Vinod Koul]

On Fri, Oct 17, 2014 at 01:15:55PM +0200, Lars-Peter Clausen wrote:
> On 10/17/2014 09:35 AM, Vinod Koul wrote:
> >On Fri, Oct 17, 2014 at 09:45:45AM +0200, Lars-Peter Clausen wrote:
> >>On 10/17/2014 02:48 AM, Ray Jui wrote:
> >>>As part of subsystem that many slave drivers depend on, it's more
> >>>appropriate for the pl330 DMA driver to be initialized at
> >>>subsys_initcall than device_initcall
> >>
> >>Well, we do have -EPROBE_DEFER these days to handle these kinds of
> >>dependencies so we no longer have to these kinds of manual init
> >>reordering tricks.
> >How ould that work?
> >
> >Consider for example SPI and dmanegine. SPI driver got probed, then to start
> >a transaction requested a channel... while dmaengine driver is still getting
> >probed/not probed yet. So SPI driver didnt get a channel.
> >
> 
> Ideally the SPI driver requests the channel in probe function and if
> the DMA controller is not yet probed returns EPROBE_DEFER. If the
> SPI driver requests the channel in the transfer handler it needs to
> deal with being able to fall back to non DMA transfers anyway so
> this shouldn't be a problem.
> 
> But in any case fiddling around with the init sequences is just a
> quick hack and might makes the problem less likely to appear in some
> cases, but there is no guarantee that it works. And I think the
> proper solution at the moment is to use probe deferral.
> 
> Other subsystems have seen patches which moved drivers from using
> subsys_initcall to device_initcall/module_..._driver/ with the
> reasoning that this is no longer necessary because of EPROBE_DEFER.
> So I don't think we should be doing the exact opposite in DMA
> framework. Also if we'd apply this patch it won't take to long until
> somebody suggest going back to module_platform_driver() instead of
> subsys_initcall.

Sure, I don't mind moving the driver to module_ if that solves the problem
with defer probe. I am still not able to wrap my head around on how will
deferral probe solve the problem, for example in above SPI case.

So when we request & channel is not found, it can be all that channels are
given out so nothing to give or controller of interest not available. How do
we distinguish between these and how does controller driver say "looks like
device might not be probed, let me try later"?

-- 
~Vinod

Re: [PATCH] dmaengine: pl330: use subsys_initcall

[Vinod Koul]

On Fri, Oct 17, 2014 at 06:39:41PM +0200, Lars-Peter Clausen wrote:
> On 10/17/2014 06:18 PM, Ray Jui wrote:
> >On 10/17/2014 4:15 AM, Lars-Peter Clausen wrote:
> >>On 10/17/2014 09:35 AM, Vinod Koul wrote:
> >>>On Fri, Oct 17, 2014 at 09:45:45AM +0200, Lars-Peter Clausen wrote:
> >>>>On 10/17/2014 02:48 AM, Ray Jui wrote:
> >>>>>As part of subsystem that many slave drivers depend on, it's more
> >>>>>appropriate for the pl330 DMA driver to be initialized at
> >>>>>subsys_initcall than device_initcall
> >>>>
> >>>>Well, we do have -EPROBE_DEFER these days to handle these kinds of
> >>>>dependencies so we no longer have to these kinds of manual init
> >>>>reordering tricks.
> >>>How ould that work?
> >>>
> >>>Consider for example SPI and dmanegine. SPI driver got probed, then to
> >>>start
> >>>a transaction requested a channel... while dmaengine driver is still
> >>>getting
> >>>probed/not probed yet. So SPI driver didnt get a channel.
> >>>
> >>
> >>Ideally the SPI driver requests the channel in probe function and if the
> >>DMA controller is not yet probed returns EPROBE_DEFER. If the SPI driver
> >>requests the channel in the transfer handler it needs to deal with being
> >>able to fall back to non DMA transfers anyway so this shouldn't be a
> >>problem.
> >So in the case of the spi-pl022 driver. It requests the channel in probe
> >function. And obviously DMA is not mandatory, so when the channel request
> >fails the probe won't fail and instead it falls back to PIO. In this case,
> >can you recommend a different way to solve this problem without having the
> >DMA driver probed earlier than its slaves?
> 
> 
> dma_request_slave_channel() has the problem that we can't
> differentiate between no channel provided and channel provided but
> the dma driver hasn't probed yet. The function will return NULL in
> both cases. But Stephen Warren added
> dma_request_slave_channel_reason() a while ago to solve this
> problem. This function returns a ERR_PTR. If it returns
> ERR_PTR(-EPROBE_DEFER) it means that a channel has been provided but
> the DMA driver hasn't probed yet. In this case the SPI driver should
> return -EPROBE_DEFER to try again later. If the function returns a
> different error code that means that it was not possible to get the
> DMA channel and it should fall back to PIO.
So when should the SPI here check, if dmaengine is available. The client
doesn't grab channel in its probe, so the client cannot return
-EPROBE_DEFER.

-- 
~Vinod

> 
> >
> >>
> >>But in any case fiddling around with the init sequences is just a quick
> >>hack and might makes the problem less likely to appear in some cases,
> >>but there is no guarantee that it works. And I think the proper solution
> >>at the moment is to use probe deferral.
> >I think it makes sense to have the DMA driver, as one of the core components
> >in various SoCs that a lot of peripheral drivers depend on, to be registered
> >at the level of subsys_init or somewhere close. We are not changing this
> >just to get SPI to work. We are changing this because we think DMA should be
> >ready before a lot of its slaves, which are typically done at device_initcall.
> 
> But if the DMA driver for example depends on a clock driver do you
> put the clock driver at a even earlier init level? The problem with
> using init levels for solving this problem is that there is only a
> small amount of init levels available and representing the
> dependency chains is neither possible with it nor were init level
> ever intended for solving this. EPROBE_DEFER on the other hand is.
> 
> >
> >I have no problem relying on EPROBE_DEFER for this, provided that it works.
> >The issue is, like I mentioned above, for a lot of slave devices DMA is not
> >mandatory, when DMA fails at probe they would fall back to PIO and never use
> >DMA. Another disadvantage I see with EPROBE_DEFER is delayed boot time.
> >
> 
> Yea, the EPROBE_DEFER implementation is not ideal, but that is a
> problem that should be solved rather than working around it. I think
> there are patches somewhere for example that build a device
> dependency graph from the phandles in the devicetree and than probe
> devices in the correct order to reduce the number of times probe
> deferral is necessary.
> 
> >>
> >>Other subsystems have seen patches which moved drivers from using
> >>subsys_initcall to device_initcall/module_..._driver/ with the reasoning
> >>that this is no longer necessary because of EPROBE_DEFER. So I don't
> >>think we should be doing the exact opposite in DMA framework. Also if
> >>we'd apply this patch it won't take to long until somebody suggest going
> >>back to module_platform_driver() instead of subsys_initcall.
> >>
> >>- Lars
> >There are currently 12 DMA drivers under drivers/dma registering themselves
> >at subsys_init. I don't see why pl330 cannot do the same. Is there any
> >concern that it may not work for some other SoCs when it's done at
> >subsys_init? So far I cannot think of any. The only dependency of pl330 is
> >the ARM apb_pclk, required during AMBA bus probe. But that's usually ready
> >before subsys_init.
> 
> Those other drivers should be converted to device_initcall rather
> than converting the PL330 driver to subsys_init. Using subsys_init
> for device drivers is a hack which was used to try to solve ordering
> problems. But it doesn't work that great, especially if you have
> more than two devices in your dependency chain. The solution that
> people have come up with to solve this problem in a better way is
> probe deferral by the means of -EPROBE_DEFER.
> 
> - Lars
> 

-- 

Re: [PATCH] dmaengine: pl330: use subsys_initcall

[Ray Jui]

On 10/21/2014 3:45 AM, Vinod Koul wrote:
> On Fri, Oct 17, 2014 at 06:39:41PM +0200, Lars-Peter Clausen wrote:
>> On 10/17/2014 06:18 PM, Ray Jui wrote:
>>> On 10/17/2014 4:15 AM, Lars-Peter Clausen wrote:
>>>> On 10/17/2014 09:35 AM, Vinod Koul wrote:
>>>>> On Fri, Oct 17, 2014 at 09:45:45AM +0200, Lars-Peter Clausen wrote:
>>>>>> On 10/17/2014 02:48 AM, Ray Jui wrote:
>>>>>>> As part of subsystem that many slave drivers depend on, it's more
>>>>>>> appropriate for the pl330 DMA driver to be initialized at
>>>>>>> subsys_initcall than device_initcall
>>>>>>
>>>>>> Well, we do have -EPROBE_DEFER these days to handle these kinds of
>>>>>> dependencies so we no longer have to these kinds of manual init
>>>>>> reordering tricks.
>>>>> How ould that work?
>>>>>
>>>>> Consider for example SPI and dmanegine. SPI driver got probed, then to
>>>>> start
>>>>> a transaction requested a channel... while dmaengine driver is still
>>>>> getting
>>>>> probed/not probed yet. So SPI driver didnt get a channel.
>>>>>
>>>>
>>>> Ideally the SPI driver requests the channel in probe function and if the
>>>> DMA controller is not yet probed returns EPROBE_DEFER. If the SPI driver
>>>> requests the channel in the transfer handler it needs to deal with being
>>>> able to fall back to non DMA transfers anyway so this shouldn't be a
>>>> problem.
>>> So in the case of the spi-pl022 driver. It requests the channel in probe
>>> function. And obviously DMA is not mandatory, so when the channel request
>>> fails the probe won't fail and instead it falls back to PIO. In this case,
>>> can you recommend a different way to solve this problem without having the
>>> DMA driver probed earlier than its slaves?
>>
>>
>> dma_request_slave_channel() has the problem that we can't
>> differentiate between no channel provided and channel provided but
>> the dma driver hasn't probed yet. The function will return NULL in
>> both cases. But Stephen Warren added
>> dma_request_slave_channel_reason() a while ago to solve this
>> problem. This function returns a ERR_PTR. If it returns
>> ERR_PTR(-EPROBE_DEFER) it means that a channel has been provided but
>> the DMA driver hasn't probed yet. In this case the SPI driver should
>> return -EPROBE_DEFER to try again later. If the function returns a
>> different error code that means that it was not possible to get the
>> DMA channel and it should fall back to PIO.
> So when should the SPI here check, if dmaengine is available. The client
> doesn't grab channel in its probe, so the client cannot return
> -EPROBE_DEFER.
>
Currently the spi-pl022 driver requests its DMA channel in 
pl022_dma_autoprobe, called during driver probe. Lars suggested changing 
the dma_request_slave_channel call to dma_request_slave_channel_reason. 
 From my understanding, dma_request_slave_channel_reason should return 
-EPROBE_DEFER if the DMA controller (pl330) device node and its channels 
are declared in device tree but the driver hasn't been probed. The SPI 
driver can then return -EPROBE_DEFER, which will cause its probe to be 
done again, at a later time. By then the pl330 driver will be ready.

This will solve our problem, because we don't care when SPI is probed, 
but we want to use DMA instead of PIO. But for the original problem that 
Linus tried to solve by moving spi probe to subsys_initcall in 25c8e03b, 
if one wants spi probe to be done that early, it will not be able to use 
DMA with the currently proposed change.

[PATCH 0/4] Add pinctrl support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial pinctrl support for the Broadcom Cygnus SoC.
The Cygnus pinctrl controller supports group based alternate function configuration

Ray Jui (4):
  pinctrl: Broadcom Cygnus pinctrl device tree binding
  pinctrl: cygnus: add initial pinctrl support
  ARM: mach-bcm: enable pinctrl support for Cygnus
  ARM: dts: enable pinctrl for Broadcom Cygnus

 .../bindings/pinctrl/brcm,cygnus-pinctrl.txt       |   92 +++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |    5 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/pinctrl/Kconfig                            |    7 +
 drivers/pinctrl/Makefile                           |    1 +
 drivers/pinctrl/pinctrl-bcm-cygnus.c               |  753 ++++++++++++++++++++
 6 files changed, 859 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
 create mode 100644 drivers/pinctrl/pinctrl-bcm-cygnus.c

-- 
1.7.9.5

[PATCH 0/4] Add pinctrl support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial pinctrl support for the Broadcom Cygnus SoC.
The Cygnus pinctrl controller supports group based alternate function configuration

Ray Jui (4):
  pinctrl: Broadcom Cygnus pinctrl device tree binding
  pinctrl: cygnus: add initial pinctrl support
  ARM: mach-bcm: enable pinctrl support for Cygnus
  ARM: dts: enable pinctrl for Broadcom Cygnus

 .../bindings/pinctrl/brcm,cygnus-pinctrl.txt       |   92 +++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |    5 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/pinctrl/Kconfig                            |    7 +
 drivers/pinctrl/Makefile                           |    1 +
 drivers/pinctrl/pinctrl-bcm-cygnus.c               |  753 ++++++++++++++++++++
 6 files changed, 859 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
 create mode 100644 drivers/pinctrl/pinctrl-bcm-cygnus.c

-- 
1.7.9.5

--
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[PATCH 0/4] Add pinctrl support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial pinctrl support for the Broadcom Cygnus SoC.
The Cygnus pinctrl controller supports group based alternate function configuration

Ray Jui (4):
  pinctrl: Broadcom Cygnus pinctrl device tree binding
  pinctrl: cygnus: add initial pinctrl support
  ARM: mach-bcm: enable pinctrl support for Cygnus
  ARM: dts: enable pinctrl for Broadcom Cygnus

 .../bindings/pinctrl/brcm,cygnus-pinctrl.txt       |   92 +++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |    5 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/pinctrl/Kconfig                            |    7 +
 drivers/pinctrl/Makefile                           |    1 +
 drivers/pinctrl/pinctrl-bcm-cygnus.c               |  753 ++++++++++++++++++++
 6 files changed, 859 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
 create mode 100644 drivers/pinctrl/pinctrl-bcm-cygnus.c

-- 
1.7.9.5

[PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Ray Jui]

Device tree binding documentation for Broadcom Cygnus pinctrl driver

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../bindings/pinctrl/brcm,cygnus-pinctrl.txt       |   92 ++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt

diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
new file mode 100644
index 0000000..86e4579
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
@@ -0,0 +1,92 @@
+Broadcom Cygnus Pin Controller
+
+The Cygnus pin controller supports setting the alternate functions of groups
+of pins. Pinmux configuration on individual pins is not supported by the
+Cygnus A0 SoC.
+
+Required properties:
+
+- compatible:
+    Must be "brcm,cygnus-pinctrl"
+
+- reg:
+    Define the base and range of the I/O address space that contain the Cygnus
+pin control registers
+
+- brcm,groups:
+    This can be strings of one or more group names. This defines the group(s)
+that one wants to configure
+
+- brcm,function:
+    This is the alternate function that one wants to configure to. Valid
+alternate functions are "alt1", "alt2", "alt3", "alt4"
+
+Each child node represents a configuration. Client devices reference the the
+child node to enable the mux configuration.
+
+For example:
+
+	pinctrl: pinctrl@0x0301d0c8 {
+		compatible = "brcm,cygnus-pinctrl";
+		reg = <0x0301d0c8 0x2c>;
+
+		i2s_0: i2s_0 {
+			brcm,groups = "smart_card0", "smart_card0_fcb";
+			brcm,function = "alt2";
+		};
+
+		i2s_1: i2s_1 {
+			brcm,groups = "smart_card1", "smart_card1_fcb";
+			brcm,function = "alt2";
+		};
+
+		spi_0: spi_0 {
+			brcm,groups = "spi0";
+			brcm,function = "alt1";
+		};
+	}
+
+	spi0@18028000 {
+			compatible = "arm,pl022", "arm,primecell";
+			reg = <0x18028000 0x1000>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			interrupts = <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>;
+			pinctrl-0 = <&spi_0>;
+			clocks = <&axi81_clk>;
+			clock-names = "apb_pclk";
+	};
+
+Consider the following snapshot of Cygnus pinmux table:
+
+number    pin            group              alt1             alt2        alt3        alt4
+------    ---            ----               ----             ----        ----        ----
+42        sc0_clk        smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio24
+43        sc0_cmdvcc_l   smart_card0        SMART CARD0      I2S_0       N/A         STRAP
+44        sc0_detect     smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio25
+45        sc0_fcb        smart_card0_fcb    SMART CARD0_FCB  I2S_0       N/A         chip_gpio26
+46        sc0_io         smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio27
+47        sc0_rst_l      smart_card0        SMART CARD0      SPDIF       N/A         STRAP
+
+Note due to limitation of the Cygnus hardware, pinmux configuration can only
+be group based. To enable I2S_0 function, one needs the following child node
+configuration:
+
+	i2s_0: i2s_0 {
+		brcm,groups = "smart_card0", "smart_card0_fcb";
+		brcm,function = "alt2";
+	};
+
+This tells the Cygnus pin controller to configure groups "smart_card0" and
+"smart_card0_fcb" to I2S_0. With this configuration, pins 42, 43, 44, 45, 46
+become I2C_0, and pin 47 becomes SPDIF
+
+Consider another example, that one wants to configure the above pins as GPIO:
+
+	gpio_24_27: gpio_24_27 {
+		brcm,groups = "smart_card0", "smart_card0_fcb";
+		brcm,function = "alt4";
+	};
+
+With the above configuration, pins 42, 44, 45, 46 become GPIO, and 43 and 47
+become reserved for STRAP
-- 
1.7.9.5

[PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Ray Jui]

Device tree binding documentation for Broadcom Cygnus pinctrl driver

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../bindings/pinctrl/brcm,cygnus-pinctrl.txt       |   92 ++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt

diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
new file mode 100644
index 0000000..86e4579
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
@@ -0,0 +1,92 @@
+Broadcom Cygnus Pin Controller
+
+The Cygnus pin controller supports setting the alternate functions of groups
+of pins. Pinmux configuration on individual pins is not supported by the
+Cygnus A0 SoC.
+
+Required properties:
+
+- compatible:
+    Must be "brcm,cygnus-pinctrl"
+
+- reg:
+    Define the base and range of the I/O address space that contain the Cygnus
+pin control registers
+
+- brcm,groups:
+    This can be strings of one or more group names. This defines the group(s)
+that one wants to configure
+
+- brcm,function:
+    This is the alternate function that one wants to configure to. Valid
+alternate functions are "alt1", "alt2", "alt3", "alt4"
+
+Each child node represents a configuration. Client devices reference the the
+child node to enable the mux configuration.
+
+For example:
+
+	pinctrl: pinctrl@0x0301d0c8 {
+		compatible = "brcm,cygnus-pinctrl";
+		reg = <0x0301d0c8 0x2c>;
+
+		i2s_0: i2s_0 {
+			brcm,groups = "smart_card0", "smart_card0_fcb";
+			brcm,function = "alt2";
+		};
+
+		i2s_1: i2s_1 {
+			brcm,groups = "smart_card1", "smart_card1_fcb";
+			brcm,function = "alt2";
+		};
+
+		spi_0: spi_0 {
+			brcm,groups = "spi0";
+			brcm,function = "alt1";
+		};
+	}
+
+	spi0@18028000 {
+			compatible = "arm,pl022", "arm,primecell";
+			reg = <0x18028000 0x1000>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			interrupts = <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>;
+			pinctrl-0 = <&spi_0>;
+			clocks = <&axi81_clk>;
+			clock-names = "apb_pclk";
+	};
+
+Consider the following snapshot of Cygnus pinmux table:
+
+number    pin            group              alt1             alt2        alt3        alt4
+------    ---            ----               ----             ----        ----        ----
+42        sc0_clk        smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio24
+43        sc0_cmdvcc_l   smart_card0        SMART CARD0      I2S_0       N/A         STRAP
+44        sc0_detect     smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio25
+45        sc0_fcb        smart_card0_fcb    SMART CARD0_FCB  I2S_0       N/A         chip_gpio26
+46        sc0_io         smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio27
+47        sc0_rst_l      smart_card0        SMART CARD0      SPDIF       N/A         STRAP
+
+Note due to limitation of the Cygnus hardware, pinmux configuration can only
+be group based. To enable I2S_0 function, one needs the following child node
+configuration:
+
+	i2s_0: i2s_0 {
+		brcm,groups = "smart_card0", "smart_card0_fcb";
+		brcm,function = "alt2";
+	};
+
+This tells the Cygnus pin controller to configure groups "smart_card0" and
+"smart_card0_fcb" to I2S_0. With this configuration, pins 42, 43, 44, 45, 46
+become I2C_0, and pin 47 becomes SPDIF
+
+Consider another example, that one wants to configure the above pins as GPIO:
+
+	gpio_24_27: gpio_24_27 {
+		brcm,groups = "smart_card0", "smart_card0_fcb";
+		brcm,function = "alt4";
+	};
+
+With the above configuration, pins 42, 44, 45, 46 become GPIO, and 43 and 47
+become reserved for STRAP
-- 
1.7.9.5

[PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Ray Jui]

Device tree binding documentation for Broadcom Cygnus pinctrl driver

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../bindings/pinctrl/brcm,cygnus-pinctrl.txt       |   92 ++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt

diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
new file mode 100644
index 0000000..86e4579
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
@@ -0,0 +1,92 @@
+Broadcom Cygnus Pin Controller
+
+The Cygnus pin controller supports setting the alternate functions of groups
+of pins. Pinmux configuration on individual pins is not supported by the
+Cygnus A0 SoC.
+
+Required properties:
+
+- compatible:
+    Must be "brcm,cygnus-pinctrl"
+
+- reg:
+    Define the base and range of the I/O address space that contain the Cygnus
+pin control registers
+
+- brcm,groups:
+    This can be strings of one or more group names. This defines the group(s)
+that one wants to configure
+
+- brcm,function:
+    This is the alternate function that one wants to configure to. Valid
+alternate functions are "alt1", "alt2", "alt3", "alt4"
+
+Each child node represents a configuration. Client devices reference the the
+child node to enable the mux configuration.
+
+For example:
+
+	pinctrl: pinctrl at 0x0301d0c8 {
+		compatible = "brcm,cygnus-pinctrl";
+		reg = <0x0301d0c8 0x2c>;
+
+		i2s_0: i2s_0 {
+			brcm,groups = "smart_card0", "smart_card0_fcb";
+			brcm,function = "alt2";
+		};
+
+		i2s_1: i2s_1 {
+			brcm,groups = "smart_card1", "smart_card1_fcb";
+			brcm,function = "alt2";
+		};
+
+		spi_0: spi_0 {
+			brcm,groups = "spi0";
+			brcm,function = "alt1";
+		};
+	}
+
+	spi0 at 18028000 {
+			compatible = "arm,pl022", "arm,primecell";
+			reg = <0x18028000 0x1000>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			interrupts = <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>;
+			pinctrl-0 = <&spi_0>;
+			clocks = <&axi81_clk>;
+			clock-names = "apb_pclk";
+	};
+
+Consider the following snapshot of Cygnus pinmux table:
+
+number    pin            group              alt1             alt2        alt3        alt4
+------    ---            ----               ----             ----        ----        ----
+42        sc0_clk        smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio24
+43        sc0_cmdvcc_l   smart_card0        SMART CARD0      I2S_0       N/A         STRAP
+44        sc0_detect     smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio25
+45        sc0_fcb        smart_card0_fcb    SMART CARD0_FCB  I2S_0       N/A         chip_gpio26
+46        sc0_io         smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio27
+47        sc0_rst_l      smart_card0        SMART CARD0      SPDIF       N/A         STRAP
+
+Note due to limitation of the Cygnus hardware, pinmux configuration can only
+be group based. To enable I2S_0 function, one needs the following child node
+configuration:
+
+	i2s_0: i2s_0 {
+		brcm,groups = "smart_card0", "smart_card0_fcb";
+		brcm,function = "alt2";
+	};
+
+This tells the Cygnus pin controller to configure groups "smart_card0" and
+"smart_card0_fcb" to I2S_0. With this configuration, pins 42, 43, 44, 45, 46
+become I2C_0, and pin 47 becomes SPDIF
+
+Consider another example, that one wants to configure the above pins as GPIO:
+
+	gpio_24_27: gpio_24_27 {
+		brcm,groups = "smart_card0", "smart_card0_fcb";
+		brcm,function = "alt4";
+	};
+
+With the above configuration, pins 42, 44, 45, 46 become GPIO, and 43 and 47
+become reserved for STRAP
-- 
1.7.9.5

[PATCH 2/4] pinctrl: cygnus: add initial pinctrl support

[Ray Jui]

This adds the initial driver support for the Broadcom Cygnus pinctrl
controller. The Cygnus pinctrl controller supports group based
alternate function configuration

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
---
 drivers/pinctrl/Kconfig              |    7 +
 drivers/pinctrl/Makefile             |    1 +
 drivers/pinctrl/pinctrl-bcm-cygnus.c |  753 ++++++++++++++++++++++++++++++++++
 3 files changed, 761 insertions(+)
 create mode 100644 drivers/pinctrl/pinctrl-bcm-cygnus.c

diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index d014f22..4549e9f 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -85,6 +85,13 @@ config PINCTRL_BCM281XX
 	  BCM28145, and BCM28155 SoCs.  This driver requires the pinctrl
 	  framework.  GPIO is provided by a separate GPIO driver.
 
+config PINCTRL_BCM_CYGNUS
+	bool "Broadcom Cygnus pinctrl driver"
+	depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
+	select PINMUX
+	select PINCONF
+	select GENERIC_PINCONF
+
 config PINCTRL_LANTIQ
 	bool
 	depends on LANTIQ
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index c030b3d..4ed8e8a 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_PINCTRL_BF60x)	+= pinctrl-adi2-bf60x.o
 obj-$(CONFIG_PINCTRL_AT91)	+= pinctrl-at91.o
 obj-$(CONFIG_PINCTRL_BCM2835)	+= pinctrl-bcm2835.o
 obj-$(CONFIG_PINCTRL_BCM281XX)	+= pinctrl-bcm281xx.o
+obj-$(CONFIG_PINCTRL_BCM_CYGNUS)	+= pinctrl-bcm-cygnus.o
 obj-$(CONFIG_PINCTRL_FALCON)	+= pinctrl-falcon.o
 obj-$(CONFIG_PINCTRL_PALMAS)	+= pinctrl-palmas.o
 obj-$(CONFIG_PINCTRL_ROCKCHIP)	+= pinctrl-rockchip.o
diff --git a/drivers/pinctrl/pinctrl-bcm-cygnus.c b/drivers/pinctrl/pinctrl-bcm-cygnus.c
new file mode 100644
index 0000000..eb6e27a
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-bcm-cygnus.c
@@ -0,0 +1,753 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/slab.h>
+
+#include "core.h"
+#include "pinctrl-utils.h"
+
+/*
+ * Alternate function configuration
+ *
+ * @name: name of the alternate function
+ * @group_names: array of strings of group names that can be supported by this
+ * alternate function
+ * @num_groups: total number of groups that can be supported by this alternate
+ * function
+ * @mux: mux setting for this alternate function to be programed
+ */
+struct cygnus_pin_function {
+	const char *name;
+	const char * const *group_names;
+	const unsigned num_groups;
+	unsigned int mux;
+};
+
+/*
+ * Cygnus allows group based pinmux configuration
+ *
+ * @name: name of the group
+ * @pins: array of pins used by this group
+ * @num_pins: total number of pins used by this group
+ * @offset: register offset for pinmux configuration of this group
+ * @shift: bit shift for pinmux configuration of this group
+ */
+struct cygnus_pin_group {
+	const char *name;
+	const unsigned *pins;
+	const unsigned num_pins;
+	const unsigned int offset;
+	const unsigned int shift;
+};
+
+/*
+ * Cygnus pinctrl core
+ *
+ * @pctl: pointer to pinctrl_dev
+ * @dev: pointer to the device
+ * @base: I/O register base for Cygnus pinctrl configuration
+ *
+ */
+struct cygnus_pinctrl {
+	struct pinctrl_dev *pctl;
+	struct device *dev;
+	void __iomem *base;
+
+	const struct pinctrl_pin_desc *pins;
+	unsigned num_pins;
+
+	const struct cygnus_pin_group *groups;
+	unsigned num_groups;
+
+	const struct cygnus_pin_function *functions;
+	unsigned num_functions;
+};
+
+#define CYGNUS_PIN_GROUP(group_name, off, sh)		\
+{							\
+	.name = #group_name,				\
+	.pins = group_name##_pins,			\
+	.num_pins = ARRAY_SIZE(group_name##_pins),	\
+	.offset = off,					\
+	.shift = sh,					\
+}
+
+/*
+ * The following pin description is based on Cygnus I/O MUX spreadsheet
+ */
+static const struct pinctrl_pin_desc cygnus_pinctrl_pins[] = {
+	PINCTRL_PIN(0, "ext_device_reset_n"),
+	PINCTRL_PIN(1, "chip_mode0"),
+	PINCTRL_PIN(2, "chip_mode1"),
+	PINCTRL_PIN(3, "chip_mode2"),
+	PINCTRL_PIN(4, "chip_mode3"),
+	PINCTRL_PIN(5, "chip_mode4"),
+	PINCTRL_PIN(6, "bsc0_scl"),
+	PINCTRL_PIN(7, "bsc0_sda"),
+	PINCTRL_PIN(8, "bsc1_scl"),
+	PINCTRL_PIN(9, "bsc1_sda"),
+	PINCTRL_PIN(10, "d1w_dq"),
+	PINCTRL_PIN(11, "d1wowstz_l"),
+	PINCTRL_PIN(12, "gpio0"),
+	PINCTRL_PIN(13, "gpio1"),
+	PINCTRL_PIN(14, "gpio2"),
+	PINCTRL_PIN(15, "gpio3"),
+	PINCTRL_PIN(16, "gpio4"),
+	PINCTRL_PIN(17, "gpio5"),
+	PINCTRL_PIN(18, "gpio6"),
+	PINCTRL_PIN(19, "gpio7"),
+	PINCTRL_PIN(20, "gpio8"),
+	PINCTRL_PIN(21, "gpio9"),
+	PINCTRL_PIN(22, "gpio10"),
+	PINCTRL_PIN(23, "gpio11"),
+	PINCTRL_PIN(24, "gpio12"),
+	PINCTRL_PIN(25, "gpio13"),
+	PINCTRL_PIN(26, "gpio14"),
+	PINCTRL_PIN(27, "gpio15"),
+	PINCTRL_PIN(28, "gpio16"),
+	PINCTRL_PIN(29, "gpio17"),
+	PINCTRL_PIN(30, "gpio18"),
+	PINCTRL_PIN(31, "gpio19"),
+	PINCTRL_PIN(32, "gpio20"),
+	PINCTRL_PIN(33, "gpio21"),
+	PINCTRL_PIN(34, "gpio22"),
+	PINCTRL_PIN(35, "gpio23"),
+	PINCTRL_PIN(36, "mdc"),
+	PINCTRL_PIN(37, "mdio"),
+	PINCTRL_PIN(38, "pwm0"),
+	PINCTRL_PIN(39, "pwm1"),
+	PINCTRL_PIN(40, "pwm2"),
+	PINCTRL_PIN(41, "pwm3"),
+	PINCTRL_PIN(42, "sc0_clk"),
+	PINCTRL_PIN(43, "sc0_cmdvcc_l"),
+	PINCTRL_PIN(44, "sc0_detect"),
+	PINCTRL_PIN(45, "sc0_fcb"),
+	PINCTRL_PIN(46, "sc0_io"),
+	PINCTRL_PIN(47, "sc0_rst_l"),
+	PINCTRL_PIN(48, "sc1_clk"),
+	PINCTRL_PIN(49, "sc1_cmdvcc_l"),
+	PINCTRL_PIN(50, "sc1_detect"),
+	PINCTRL_PIN(51, "sc1_fcb"),
+	PINCTRL_PIN(52, "sc1_io"),
+	PINCTRL_PIN(53, "sc1_rst_l"),
+	PINCTRL_PIN(54, "spi0_clk"),
+	PINCTRL_PIN(55, "spi0_mosi"),
+	PINCTRL_PIN(56, "spi0_miso"),
+	PINCTRL_PIN(57, "spi0_ss"),
+	PINCTRL_PIN(58, "spi1_clk"),
+	PINCTRL_PIN(59, "spi1_mosi"),
+	PINCTRL_PIN(60, "spi1_miso"),
+	PINCTRL_PIN(61, "spi1_ss"),
+	PINCTRL_PIN(62, "spi2_clk"),
+	PINCTRL_PIN(63, "spi2_mosi"),
+	PINCTRL_PIN(64, "spi2_miso"),
+	PINCTRL_PIN(65, "spi2_ss"),
+	PINCTRL_PIN(66, "spi3_clk"),
+	PINCTRL_PIN(67, "spi3_mosi"),
+	PINCTRL_PIN(68, "spi3_miso"),
+	PINCTRL_PIN(69, "spi3_ss"),
+	PINCTRL_PIN(70, "uart0_cts"),
+	PINCTRL_PIN(71, "uart0_rts"),
+	PINCTRL_PIN(72, "uart0_rx"),
+	PINCTRL_PIN(73, "uart0_tx"),
+	PINCTRL_PIN(74, "uart1_cts"),
+	PINCTRL_PIN(75, "uart1_dcd"),
+	PINCTRL_PIN(76, "uart1_dsr"),
+	PINCTRL_PIN(77, "uart1_dtr"),
+	PINCTRL_PIN(78, "uart1_ri"),
+	PINCTRL_PIN(79, "uart1_rts"),
+	PINCTRL_PIN(80, "uart1_rx"),
+	PINCTRL_PIN(81, "uart1_tx"),
+	PINCTRL_PIN(82, "uart3_rx"),
+	PINCTRL_PIN(83, "uart3_tx"),
+	PINCTRL_PIN(84, "sdio1_clk_sdcard"),
+	PINCTRL_PIN(85, "sdio1_cmd"),
+	PINCTRL_PIN(86, "sdio1_data0"),
+	PINCTRL_PIN(87, "sdio1_data1"),
+	PINCTRL_PIN(88, "sdio1_data2"),
+	PINCTRL_PIN(89, "sdio1_data3"),
+	PINCTRL_PIN(90, "sdio1_wp_n"),
+	PINCTRL_PIN(91, "sdio1_card_rst"),
+	PINCTRL_PIN(92, "sdio1_led_on"),
+	PINCTRL_PIN(93, "sdio1_cd"),
+	PINCTRL_PIN(94, "sdio0_clk_sdcard"),
+	PINCTRL_PIN(95, "sdio0_cmd"),
+	PINCTRL_PIN(96, "sdio0_data0"),
+	PINCTRL_PIN(97, "sdio0_data1"),
+	PINCTRL_PIN(98, "sdio0_data2"),
+	PINCTRL_PIN(99, "sdio0_data3"),
+	PINCTRL_PIN(100, "sdio0_wp_n"),
+	PINCTRL_PIN(101, "sdio0_card_rst"),
+	PINCTRL_PIN(102, "sdio0_led_on"),
+	PINCTRL_PIN(103, "sdio0_cd"),
+	PINCTRL_PIN(104, "sflash_clk"),
+	PINCTRL_PIN(105, "sflash_cs_l"),
+	PINCTRL_PIN(106, "sflash_mosi"),
+	PINCTRL_PIN(107, "sflash_miso"),
+	PINCTRL_PIN(108, "sflash_wp_n"),
+	PINCTRL_PIN(109, "sflash_hold_n"),
+	PINCTRL_PIN(110, "nand_ale"),
+	PINCTRL_PIN(111, "nand_ce0_l"),
+	PINCTRL_PIN(112, "nand_ce1_l"),
+	PINCTRL_PIN(113, "nand_cle"),
+	PINCTRL_PIN(114, "nand_dq0"),
+	PINCTRL_PIN(115, "nand_dq1"),
+	PINCTRL_PIN(116, "nand_dq2"),
+	PINCTRL_PIN(117, "nand_dq3"),
+	PINCTRL_PIN(118, "nand_dq4"),
+	PINCTRL_PIN(119, "nand_dq5"),
+	PINCTRL_PIN(120, "nand_dq6"),
+	PINCTRL_PIN(121, "nand_dq7"),
+	PINCTRL_PIN(122, "nand_rb_l"),
+	PINCTRL_PIN(123, "nand_re_l"),
+	PINCTRL_PIN(124, "nand_we_l"),
+	PINCTRL_PIN(125, "nand_wp_l"),
+	PINCTRL_PIN(126, "lcd_clac"),
+	PINCTRL_PIN(127, "lcd_clcp"),
+	PINCTRL_PIN(128, "lcd_cld0"),
+	PINCTRL_PIN(129, "lcd_cld1"),
+	PINCTRL_PIN(130, "lcd_cld10"),
+	PINCTRL_PIN(131, "lcd_cld11"),
+	PINCTRL_PIN(132, "lcd_cld12"),
+	PINCTRL_PIN(133, "lcd_cld13"),
+	PINCTRL_PIN(134, "lcd_cld14"),
+	PINCTRL_PIN(135, "lcd_cld15"),
+	PINCTRL_PIN(136, "lcd_cld16"),
+	PINCTRL_PIN(137, "lcd_cld17"),
+	PINCTRL_PIN(138, "lcd_cld18"),
+	PINCTRL_PIN(139, "lcd_cld19"),
+	PINCTRL_PIN(140, "lcd_cld2"),
+	PINCTRL_PIN(141, "lcd_cld20"),
+	PINCTRL_PIN(142, "lcd_cld21"),
+	PINCTRL_PIN(143, "lcd_cld22"),
+	PINCTRL_PIN(144, "lcd_cld23"),
+	PINCTRL_PIN(145, "lcd_cld3"),
+	PINCTRL_PIN(146, "lcd_cld4"),
+	PINCTRL_PIN(147, "lcd_cld5"),
+	PINCTRL_PIN(148, "lcd_cld6"),
+	PINCTRL_PIN(149, "lcd_cld7"),
+	PINCTRL_PIN(150, "lcd_cld8"),
+	PINCTRL_PIN(151, "lcd_cld9"),
+	PINCTRL_PIN(152, "lcd_clfp"),
+	PINCTRL_PIN(153, "lcd_clle"),
+	PINCTRL_PIN(154, "lcd_cllp"),
+	PINCTRL_PIN(155, "lcd_clpower"),
+	PINCTRL_PIN(156, "camera_vsync"),
+	PINCTRL_PIN(157, "camera_trigger"),
+	PINCTRL_PIN(158, "camera_strobe"),
+	PINCTRL_PIN(159, "camera_standby"),
+	PINCTRL_PIN(160, "camera_reset_n"),
+	PINCTRL_PIN(161, "camera_pixdata9"),
+	PINCTRL_PIN(162, "camera_pixdata8"),
+	PINCTRL_PIN(163, "camera_pixdata7"),
+	PINCTRL_PIN(164, "camera_pixdata6"),
+	PINCTRL_PIN(165, "camera_pixdata5"),
+	PINCTRL_PIN(166, "camera_pixdata4"),
+	PINCTRL_PIN(167, "camera_pixdata3"),
+	PINCTRL_PIN(168, "camera_pixdata2"),
+	PINCTRL_PIN(169, "camera_pixdata1"),
+	PINCTRL_PIN(170, "camera_pixdata0"),
+	PINCTRL_PIN(171, "camera_pixclk"),
+	PINCTRL_PIN(172, "camera_hsync"),
+	PINCTRL_PIN(173, "camera_pll_ref_clk"),
+	PINCTRL_PIN(174, "usb_id_indication"),
+	PINCTRL_PIN(175, "usb_vbus_indication"),
+	PINCTRL_PIN(176, "gpio0_3p3"),
+	PINCTRL_PIN(177, "gpio1_3p3"),
+	PINCTRL_PIN(178, "gpio2_3p3"),
+	PINCTRL_PIN(179, "gpio3_3p3"),
+};
+
+/*
+ * List of groups of pins
+ */
+static const unsigned gpio0_pins[] = { 12 };
+static const unsigned gpio1_pins[] = { 13 };
+static const unsigned gpio2_pins[] = { 14 };
+static const unsigned gpio3_pins[] = { 15 };
+static const unsigned gpio4_pins[] = { 16 };
+static const unsigned gpio5_pins[] = { 17 };
+static const unsigned gpio6_pins[] = { 18 };
+static const unsigned gpio7_pins[] = { 19 };
+static const unsigned gpio8_pins[] = { 20 };
+static const unsigned gpio9_pins[] = { 21 };
+static const unsigned gpio10_pins[] = { 22 };
+static const unsigned gpio11_pins[] = { 23 };
+static const unsigned gpio12_pins[] = { 24 };
+static const unsigned gpio13_pins[] = { 25 };
+static const unsigned gpio14_pins[] = { 26 };
+static const unsigned gpio15_pins[] = { 27 };
+static const unsigned gpio16_pins[] = { 28 };
+static const unsigned gpio17_pins[] = { 29 };
+static const unsigned gpio18_pins[] = { 30 };
+static const unsigned gpio19_pins[] = { 31 };
+static const unsigned gpio20_pins[] = { 32 };
+static const unsigned gpio21_pins[] = { 33 };
+static const unsigned gpio22_pins[] = { 34 };
+static const unsigned gpio23_pins[] = { 35 };
+static const unsigned pwm0_pins[] = { 38 };
+static const unsigned pwm1_pins[] = { 39 };
+static const unsigned pwm2_pins[] = { 40 };
+static const unsigned pwm3_pins[] = { 41 };
+static const unsigned sdio0_pins[] = { 94, 95, 96, 97, 98, 99 };
+static const unsigned smart_card0_pins[] = { 42, 43, 44, 46, 47 };
+static const unsigned smart_card1_pins[] = { 48, 49, 50, 52, 53 };
+static const unsigned spi0_pins[] = { 54, 55, 56, 57 };
+static const unsigned spi1_pins[] = { 58, 59, 60, 61 };
+static const unsigned spi2_pins[] = { 62, 63, 64, 65 };
+static const unsigned spi3_pins[] = { 66, 67, 68, 69 };
+static const unsigned d1w_pins[] = { 10, 11 };
+static const unsigned lcd_pins[] = { 126, 127, 128, 129, 130, 131, 132,	133,
+	134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147,
+	148, 149, 150, 151, 152, 153, 154, 155 };
+static const unsigned uart0_pins[] = { 70, 71, 72, 73 };
+static const unsigned uart1_dte_pins[] = { 75, 76, 77, 78 };
+static const unsigned uart1_pins[] = { 74, 79, 80, 81 };
+static const unsigned uart3_pins[] = { 82, 83 };
+static const unsigned qspi_pins[] = { 104, 105, 106, 107 };
+static const unsigned nand_pins[] = { 110, 111, 112, 113, 114, 115, 116, 117,
+	118, 119, 120, 121, 122, 123, 124, 125 };
+static const unsigned sdio0_cd_pins[] = { 103 };
+static const unsigned sdio0_mmc_pins[] = { 100, 101, 102 };
+static const unsigned can0_spi4_pins[] = { 86, 87 };
+static const unsigned can1_spi4_pins[] = { 88, 89 };
+static const unsigned sdio1_cd_pins[] = { 93 };
+static const unsigned sdio1_led_pins[] = { 84, 85 };
+static const unsigned sdio1_mmc_pins[] = { 90, 91, 92 };
+static const unsigned camera_led_pins[] = { 156, 157, 158, 159, 160 };
+static const unsigned camera_rgmii_pins[] = { 169, 170, 171, 169, 170, 171,
+	172, 173 };
+static const unsigned camera_sram_rgmii_pins[] = { 161, 162, 163, 164, 165,
+	166, 167, 168 };
+static const unsigned qspi_gpio_pins[] = { 108, 109 };
+static const unsigned smart_card0_fcb_pins[] = { 45 };
+static const unsigned smart_card1_fcb_pins[] = { 51 };
+static const unsigned gpio0_3p3_pins[] = { 176 };
+static const unsigned gpio1_3p3_pins[] = { 177 };
+static const unsigned gpio2_3p3_pins[] = { 178 };
+
+/*
+ * List of groups names. Need to match the order in cygnus_pin_groups
+ */
+static const char * const cygnus_pin_group_names[] = {
+	"gpio0",
+	"gpio1",
+	"gpio2",
+	"gpio3",
+	"gpio4",
+	"gpio5",
+	"gpio6",
+	"gpio7",
+	"gpio8",
+	"gpio9",
+	"gpio10",
+	"gpio11",
+	"gpio12",
+	"gpio13",
+	"gpio14",
+	"gpio15",
+	"gpio16",
+	"gpio17",
+	"gpio18",
+	"gpio19",
+	"gpio20",
+	"gpio21",
+	"gpio22",
+	"gpio23",
+	"pwm0",
+	"pwm1",
+	"pwm2",
+	"pwm3",
+	"sdio0",
+	"smart_card0",
+	"smart_card1",
+	"spi0",
+	"spi1",
+	"spi2",
+	"spi3",
+	"d1w",
+	"lcd",
+	"uart0",
+	"uart1_dte",
+	"uart1",
+	"uart3",
+	"qspi",
+	"nand",
+	"sdio0_cd",
+	"sdio0_mmc",
+	"can0_spi4",
+	"can1_spi4",
+	"sdio1_cd",
+	"sdio1_led",
+	"sdio1_mmc",
+	"camera_led",
+	"camera_rgmii",
+	"camera_sram_rgmii",
+	"qspi_gpio",
+	"smart_card0_fcb",
+	"smart_card1_fcb",
+	"gpio0_3p3",
+	"gpio1_3p3",
+	"gpio2_3p3",
+};
+
+/*
+ * List of groups. Need to match the order in cygnus_pin_group_names
+ */
+static const struct cygnus_pin_group cygnus_pin_groups[] = {
+	CYGNUS_PIN_GROUP(gpio0, 0x0, 0),
+	CYGNUS_PIN_GROUP(gpio1, 0x0, 4),
+	CYGNUS_PIN_GROUP(gpio2, 0x0, 8),
+	CYGNUS_PIN_GROUP(gpio3, 0x0, 12),
+	CYGNUS_PIN_GROUP(gpio4, 0x0, 16),
+	CYGNUS_PIN_GROUP(gpio5, 0x0, 20),
+	CYGNUS_PIN_GROUP(gpio6, 0x0, 24),
+	CYGNUS_PIN_GROUP(gpio7, 0x0, 28),
+	CYGNUS_PIN_GROUP(gpio8, 0x4, 0),
+	CYGNUS_PIN_GROUP(gpio9, 0x4, 4),
+	CYGNUS_PIN_GROUP(gpio10, 0x4, 8),
+	CYGNUS_PIN_GROUP(gpio11, 0x4, 12),
+	CYGNUS_PIN_GROUP(gpio12, 0x4, 16),
+	CYGNUS_PIN_GROUP(gpio13, 0x4, 20),
+	CYGNUS_PIN_GROUP(gpio14, 0x4, 24),
+	CYGNUS_PIN_GROUP(gpio15, 0x4, 28),
+	CYGNUS_PIN_GROUP(gpio16, 0x8, 0),
+	CYGNUS_PIN_GROUP(gpio17, 0x8, 4),
+	CYGNUS_PIN_GROUP(gpio18, 0x8, 8),
+	CYGNUS_PIN_GROUP(gpio19, 0x8, 12),
+	CYGNUS_PIN_GROUP(gpio20, 0x8, 16),
+	CYGNUS_PIN_GROUP(gpio21, 0x8, 20),
+	CYGNUS_PIN_GROUP(gpio22, 0x8, 24),
+	CYGNUS_PIN_GROUP(gpio23, 0x8, 28),
+	CYGNUS_PIN_GROUP(pwm0, 0xc, 0),
+	CYGNUS_PIN_GROUP(pwm1, 0xc, 4),
+	CYGNUS_PIN_GROUP(pwm2, 0xc, 8),
+	CYGNUS_PIN_GROUP(pwm3, 0xc, 12),
+	CYGNUS_PIN_GROUP(sdio0, 0xc, 16),
+	CYGNUS_PIN_GROUP(smart_card0, 0xc, 20),
+	CYGNUS_PIN_GROUP(smart_card1, 0xc, 24),
+	CYGNUS_PIN_GROUP(spi0, 0x10, 0),
+	CYGNUS_PIN_GROUP(spi1, 0x10, 4),
+	CYGNUS_PIN_GROUP(spi2, 0x10, 8),
+	CYGNUS_PIN_GROUP(spi3, 0x10, 12),
+	CYGNUS_PIN_GROUP(d1w, 0x10, 16),
+	CYGNUS_PIN_GROUP(lcd, 0x10, 20),
+	CYGNUS_PIN_GROUP(uart0, 0x14, 0),
+	CYGNUS_PIN_GROUP(uart1_dte, 0x14, 4),
+	CYGNUS_PIN_GROUP(uart1, 0x14, 8),
+	CYGNUS_PIN_GROUP(uart3, 0x14, 12),
+	CYGNUS_PIN_GROUP(qspi, 0x14, 16),
+	CYGNUS_PIN_GROUP(nand, 0x14, 20),
+	CYGNUS_PIN_GROUP(sdio0_cd, 0x18, 0),
+	CYGNUS_PIN_GROUP(sdio0_mmc, 0x18, 4),
+	CYGNUS_PIN_GROUP(can0_spi4, 0x18, 8),
+	CYGNUS_PIN_GROUP(can1_spi4, 0x18, 12),
+	CYGNUS_PIN_GROUP(sdio1_cd, 0x18, 16),
+	CYGNUS_PIN_GROUP(sdio1_led, 0x18, 20),
+	CYGNUS_PIN_GROUP(sdio1_mmc, 0x18, 24),
+	CYGNUS_PIN_GROUP(camera_led, 0x1c, 0),
+	CYGNUS_PIN_GROUP(camera_rgmii, 0x1c, 4),
+	CYGNUS_PIN_GROUP(camera_sram_rgmii, 0x1c, 8),
+	CYGNUS_PIN_GROUP(qspi_gpio, 0x1c, 12),
+	CYGNUS_PIN_GROUP(smart_card0_fcb, 0x20, 0),
+	CYGNUS_PIN_GROUP(smart_card1_fcb, 0x20, 4),
+	CYGNUS_PIN_GROUP(gpio0_3p3, 0x28, 0),
+	CYGNUS_PIN_GROUP(gpio1_3p3, 0x28, 4),
+	CYGNUS_PIN_GROUP(gpio2_3p3, 0x28, 8),
+};
+
+#define CYGNUS_PIN_FUNCTION(fcn_name, mux_val)			\
+{								\
+	.name = #fcn_name,					\
+	.group_names = cygnus_pin_group_names,			\
+	.num_groups = ARRAY_SIZE(cygnus_pin_group_names),	\
+	.mux = mux_val,						\
+}
+
+/*
+ * Cygnus has 4 alternate functions. All groups can be configured to any of
+ * the 4 alternate functions
+ */
+static const struct cygnus_pin_function cygnus_pin_functions[] = {
+	CYGNUS_PIN_FUNCTION(alt1, 0),
+	CYGNUS_PIN_FUNCTION(alt2, 1),
+	CYGNUS_PIN_FUNCTION(alt3, 2),
+	CYGNUS_PIN_FUNCTION(alt4, 3),
+};
+
+static int cygnus_get_groups_count(struct pinctrl_dev *pctrl_dev)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->num_groups;
+}
+
+static const char *cygnus_get_group_name(struct pinctrl_dev *pctrl_dev,
+		unsigned selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->groups[selector].name;
+}
+
+static int cygnus_get_group_pins(struct pinctrl_dev *pctrl_dev,
+		unsigned selector, const unsigned **pins,
+		unsigned *num_pins)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	*pins = pinctrl->groups[selector].pins;
+	*num_pins = pinctrl->groups[selector].num_pins;
+
+	return 0;
+}
+
+static void cygnus_pin_dbg_show(struct pinctrl_dev *pctrl_dev,
+		struct seq_file *s, unsigned offset)
+{
+	seq_printf(s, " %s", dev_name(pctrl_dev->dev));
+}
+
+static int find_matched_function(const char *function_name)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(cygnus_pin_functions); i++) {
+		if (!strcmp(cygnus_pin_functions[i].name, function_name))
+			return (int)cygnus_pin_functions[i].mux;
+	}
+
+	return -EINVAL;
+}
+
+static int cygnus_dt_node_to_map(struct pinctrl_dev *pctrl_dev,
+		struct device_node *np, struct pinctrl_map **map,
+		unsigned *num_maps)
+{
+	int ret, num_groups;
+	unsigned reserved_maps = 0;
+	struct property *prop;
+	const char *group_name, *function_name;
+
+	*map = NULL;
+	*num_maps = 0;
+
+	num_groups = of_property_count_strings(np, "brcm,groups");
+	if (num_groups < 0) {
+		dev_err(pctrl_dev->dev,
+			"could not parse property brcm,groups\n");
+		return -EINVAL;
+	}
+
+	ret = of_property_read_string(np, "brcm,function", &function_name);
+	if (ret < 0) {
+		dev_err(pctrl_dev->dev,
+			"could not parse property brcm,function\n");
+		return -EINVAL;
+	}
+
+	/* make sure it's a valid alternate function */
+	ret = find_matched_function(function_name);
+	if (ret < 0) {
+		dev_err(pctrl_dev->dev, "invalid function name: %s\n",
+				function_name);
+	}
+
+	ret = pinctrl_utils_reserve_map(pctrl_dev, map, &reserved_maps,
+			num_maps, num_groups);
+	if (ret) {
+		dev_err(pctrl_dev->dev, "unable to reserve map\n");
+		return ret;
+	}
+
+	of_property_for_each_string(np, "brcm,groups", prop, group_name) {
+		ret = pinctrl_utils_add_map_mux(pctrl_dev, map,
+				&reserved_maps, num_maps, group_name,
+				function_name);
+		if (ret) {
+			dev_err(pctrl_dev->dev, "can't add map: %d\n", ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static struct pinctrl_ops cygnus_pinctrl_ops = {
+	.get_groups_count = cygnus_get_groups_count,
+	.get_group_name = cygnus_get_group_name,
+	.get_group_pins = cygnus_get_group_pins,
+	.pin_dbg_show = cygnus_pin_dbg_show,
+	.dt_node_to_map = cygnus_dt_node_to_map,
+	.dt_free_map = pinctrl_utils_dt_free_map,
+};
+
+static int cygnus_get_functions_count(struct pinctrl_dev *pctrl_dev)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->num_functions;
+}
+
+static const char *cygnus_get_function_name(struct pinctrl_dev *pctrl_dev,
+		unsigned selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->functions[selector].name;
+}
+
+static int cygnus_get_function_groups(struct pinctrl_dev *pctrl_dev,
+	unsigned selector, const char * const **groups,
+	unsigned * const num_groups)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	*groups = pinctrl->functions[selector].group_names;
+	*num_groups = pinctrl->functions[selector].num_groups;
+
+	return 0;
+}
+
+static int cygnus_pinmux_set_mux(struct pinctrl_dev *pctrl_dev,
+		unsigned function_selector, unsigned group_selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+	const struct cygnus_pin_function *function =
+			&pinctrl->functions[function_selector];
+	const struct cygnus_pin_group *group =
+			&pinctrl->groups[group_selector];
+	u32 val, mask = 0x7;
+
+	dev_dbg(pctrl_dev->dev,
+	"group:%s with offset:0x%08x shift:%u set to function: %s mux:%u\n",
+		group->name, group->offset, group->shift, function->name,
+		function->mux);
+
+	val = readl(pinctrl->base + group->offset);
+	val &= ~(mask << group->shift);
+	val |= function->mux << group->shift;
+	writel(val, pinctrl->base + group->offset);
+
+	return 0;
+}
+
+static struct pinmux_ops cygnus_pinmux_ops = {
+	.get_functions_count = cygnus_get_functions_count,
+	.get_function_name = cygnus_get_function_name,
+	.get_function_groups = cygnus_get_function_groups,
+	.set_mux = cygnus_pinmux_set_mux,
+};
+
+static struct pinctrl_desc cygnus_pinctrl_desc = {
+	.pctlops = &cygnus_pinctrl_ops,
+	.pmxops = &cygnus_pinmux_ops,
+	.owner = THIS_MODULE,
+};
+
+static int cygnus_pinctrl_probe(struct platform_device *pdev)
+{
+	struct cygnus_pinctrl *pinctrl;
+	struct resource *res;
+
+	pinctrl = devm_kzalloc(&pdev->dev, sizeof(*pinctrl), GFP_KERNEL);
+	if (!pinctrl) {
+		dev_err(&pdev->dev, "unable to allocate memory\n");
+		return -ENOMEM;
+	}
+	pinctrl->dev = &pdev->dev;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "unable to get resource\n");
+		return -ENOENT;
+	}
+
+	pinctrl->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(pinctrl->base)) {
+		dev_err(&pdev->dev, "unable to map I/O space\n");
+		return PTR_ERR(pinctrl->base);
+	}
+
+	pinctrl->pins = cygnus_pinctrl_pins;
+	pinctrl->num_pins = ARRAY_SIZE(cygnus_pinctrl_pins);
+	pinctrl->groups = cygnus_pin_groups;
+	pinctrl->num_groups = ARRAY_SIZE(cygnus_pin_groups);
+	pinctrl->functions = cygnus_pin_functions;
+	pinctrl->num_functions = ARRAY_SIZE(cygnus_pin_functions);
+
+	cygnus_pinctrl_desc.name = dev_name(&pdev->dev);
+	cygnus_pinctrl_desc.pins = cygnus_pinctrl_pins;
+	cygnus_pinctrl_desc.npins = ARRAY_SIZE(cygnus_pinctrl_pins);
+
+	pinctrl->pctl = pinctrl_register(&cygnus_pinctrl_desc, &pdev->dev,
+			pinctrl);
+	if (!pinctrl->pctl) {
+		dev_err(&pdev->dev, "unable to register cygnus pinctrl\n");
+		return -EINVAL;
+	}
+
+	platform_set_drvdata(pdev, pinctrl);
+
+	return 0;
+}
+
+static int cygnus_pinctrl_remove(struct platform_device *pdev)
+{
+	struct cygnus_pinctrl *pinctrl = platform_get_drvdata(pdev);
+
+	pinctrl_unregister(pinctrl->pctl);
+	platform_set_drvdata(pdev, NULL);
+
+	return 0;
+}
+
+static struct of_device_id cygnus_pinctrl_of_match[] = {
+	{ .compatible = "brcm,cygnus-pinctrl", },
+	{ },
+};
+
+static struct platform_driver cygnus_pinctrl_driver = {
+	.driver = {
+		.name = "cygnus-pinctrl",
+		.owner = THIS_MODULE,
+		.of_match_table = cygnus_pinctrl_of_match,
+	},
+	.probe = cygnus_pinctrl_probe,
+	.remove = cygnus_pinctrl_remove,
+};
+
+static int __init cygnus_pinctrl_init(void)
+{
+	return platform_driver_register(&cygnus_pinctrl_driver);
+}
+arch_initcall(cygnus_pinctrl_init);
+
+static void __exit cygnus_pinctrl_exit(void)
+{
+	platform_driver_unregister(&cygnus_pinctrl_driver);
+}
+module_exit(cygnus_pinctrl_exit);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus pinctrl driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH 2/4] pinctrl: cygnus: add initial pinctrl support

[Ray Jui]

This adds the initial driver support for the Broadcom Cygnus pinctrl
controller. The Cygnus pinctrl controller supports group based
alternate function configuration

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
---
 drivers/pinctrl/Kconfig              |    7 +
 drivers/pinctrl/Makefile             |    1 +
 drivers/pinctrl/pinctrl-bcm-cygnus.c |  753 ++++++++++++++++++++++++++++++++++
 3 files changed, 761 insertions(+)
 create mode 100644 drivers/pinctrl/pinctrl-bcm-cygnus.c

diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index d014f22..4549e9f 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -85,6 +85,13 @@ config PINCTRL_BCM281XX
 	  BCM28145, and BCM28155 SoCs.  This driver requires the pinctrl
 	  framework.  GPIO is provided by a separate GPIO driver.
 
+config PINCTRL_BCM_CYGNUS
+	bool "Broadcom Cygnus pinctrl driver"
+	depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
+	select PINMUX
+	select PINCONF
+	select GENERIC_PINCONF
+
 config PINCTRL_LANTIQ
 	bool
 	depends on LANTIQ
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index c030b3d..4ed8e8a 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_PINCTRL_BF60x)	+= pinctrl-adi2-bf60x.o
 obj-$(CONFIG_PINCTRL_AT91)	+= pinctrl-at91.o
 obj-$(CONFIG_PINCTRL_BCM2835)	+= pinctrl-bcm2835.o
 obj-$(CONFIG_PINCTRL_BCM281XX)	+= pinctrl-bcm281xx.o
+obj-$(CONFIG_PINCTRL_BCM_CYGNUS)	+= pinctrl-bcm-cygnus.o
 obj-$(CONFIG_PINCTRL_FALCON)	+= pinctrl-falcon.o
 obj-$(CONFIG_PINCTRL_PALMAS)	+= pinctrl-palmas.o
 obj-$(CONFIG_PINCTRL_ROCKCHIP)	+= pinctrl-rockchip.o
diff --git a/drivers/pinctrl/pinctrl-bcm-cygnus.c b/drivers/pinctrl/pinctrl-bcm-cygnus.c
new file mode 100644
index 0000000..eb6e27a
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-bcm-cygnus.c
@@ -0,0 +1,753 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/slab.h>
+
+#include "core.h"
+#include "pinctrl-utils.h"
+
+/*
+ * Alternate function configuration
+ *
+ * @name: name of the alternate function
+ * @group_names: array of strings of group names that can be supported by this
+ * alternate function
+ * @num_groups: total number of groups that can be supported by this alternate
+ * function
+ * @mux: mux setting for this alternate function to be programed
+ */
+struct cygnus_pin_function {
+	const char *name;
+	const char * const *group_names;
+	const unsigned num_groups;
+	unsigned int mux;
+};
+
+/*
+ * Cygnus allows group based pinmux configuration
+ *
+ * @name: name of the group
+ * @pins: array of pins used by this group
+ * @num_pins: total number of pins used by this group
+ * @offset: register offset for pinmux configuration of this group
+ * @shift: bit shift for pinmux configuration of this group
+ */
+struct cygnus_pin_group {
+	const char *name;
+	const unsigned *pins;
+	const unsigned num_pins;
+	const unsigned int offset;
+	const unsigned int shift;
+};
+
+/*
+ * Cygnus pinctrl core
+ *
+ * @pctl: pointer to pinctrl_dev
+ * @dev: pointer to the device
+ * @base: I/O register base for Cygnus pinctrl configuration
+ *
+ */
+struct cygnus_pinctrl {
+	struct pinctrl_dev *pctl;
+	struct device *dev;
+	void __iomem *base;
+
+	const struct pinctrl_pin_desc *pins;
+	unsigned num_pins;
+
+	const struct cygnus_pin_group *groups;
+	unsigned num_groups;
+
+	const struct cygnus_pin_function *functions;
+	unsigned num_functions;
+};
+
+#define CYGNUS_PIN_GROUP(group_name, off, sh)		\
+{							\
+	.name = #group_name,				\
+	.pins = group_name##_pins,			\
+	.num_pins = ARRAY_SIZE(group_name##_pins),	\
+	.offset = off,					\
+	.shift = sh,					\
+}
+
+/*
+ * The following pin description is based on Cygnus I/O MUX spreadsheet
+ */
+static const struct pinctrl_pin_desc cygnus_pinctrl_pins[] = {
+	PINCTRL_PIN(0, "ext_device_reset_n"),
+	PINCTRL_PIN(1, "chip_mode0"),
+	PINCTRL_PIN(2, "chip_mode1"),
+	PINCTRL_PIN(3, "chip_mode2"),
+	PINCTRL_PIN(4, "chip_mode3"),
+	PINCTRL_PIN(5, "chip_mode4"),
+	PINCTRL_PIN(6, "bsc0_scl"),
+	PINCTRL_PIN(7, "bsc0_sda"),
+	PINCTRL_PIN(8, "bsc1_scl"),
+	PINCTRL_PIN(9, "bsc1_sda"),
+	PINCTRL_PIN(10, "d1w_dq"),
+	PINCTRL_PIN(11, "d1wowstz_l"),
+	PINCTRL_PIN(12, "gpio0"),
+	PINCTRL_PIN(13, "gpio1"),
+	PINCTRL_PIN(14, "gpio2"),
+	PINCTRL_PIN(15, "gpio3"),
+	PINCTRL_PIN(16, "gpio4"),
+	PINCTRL_PIN(17, "gpio5"),
+	PINCTRL_PIN(18, "gpio6"),
+	PINCTRL_PIN(19, "gpio7"),
+	PINCTRL_PIN(20, "gpio8"),
+	PINCTRL_PIN(21, "gpio9"),
+	PINCTRL_PIN(22, "gpio10"),
+	PINCTRL_PIN(23, "gpio11"),
+	PINCTRL_PIN(24, "gpio12"),
+	PINCTRL_PIN(25, "gpio13"),
+	PINCTRL_PIN(26, "gpio14"),
+	PINCTRL_PIN(27, "gpio15"),
+	PINCTRL_PIN(28, "gpio16"),
+	PINCTRL_PIN(29, "gpio17"),
+	PINCTRL_PIN(30, "gpio18"),
+	PINCTRL_PIN(31, "gpio19"),
+	PINCTRL_PIN(32, "gpio20"),
+	PINCTRL_PIN(33, "gpio21"),
+	PINCTRL_PIN(34, "gpio22"),
+	PINCTRL_PIN(35, "gpio23"),
+	PINCTRL_PIN(36, "mdc"),
+	PINCTRL_PIN(37, "mdio"),
+	PINCTRL_PIN(38, "pwm0"),
+	PINCTRL_PIN(39, "pwm1"),
+	PINCTRL_PIN(40, "pwm2"),
+	PINCTRL_PIN(41, "pwm3"),
+	PINCTRL_PIN(42, "sc0_clk"),
+	PINCTRL_PIN(43, "sc0_cmdvcc_l"),
+	PINCTRL_PIN(44, "sc0_detect"),
+	PINCTRL_PIN(45, "sc0_fcb"),
+	PINCTRL_PIN(46, "sc0_io"),
+	PINCTRL_PIN(47, "sc0_rst_l"),
+	PINCTRL_PIN(48, "sc1_clk"),
+	PINCTRL_PIN(49, "sc1_cmdvcc_l"),
+	PINCTRL_PIN(50, "sc1_detect"),
+	PINCTRL_PIN(51, "sc1_fcb"),
+	PINCTRL_PIN(52, "sc1_io"),
+	PINCTRL_PIN(53, "sc1_rst_l"),
+	PINCTRL_PIN(54, "spi0_clk"),
+	PINCTRL_PIN(55, "spi0_mosi"),
+	PINCTRL_PIN(56, "spi0_miso"),
+	PINCTRL_PIN(57, "spi0_ss"),
+	PINCTRL_PIN(58, "spi1_clk"),
+	PINCTRL_PIN(59, "spi1_mosi"),
+	PINCTRL_PIN(60, "spi1_miso"),
+	PINCTRL_PIN(61, "spi1_ss"),
+	PINCTRL_PIN(62, "spi2_clk"),
+	PINCTRL_PIN(63, "spi2_mosi"),
+	PINCTRL_PIN(64, "spi2_miso"),
+	PINCTRL_PIN(65, "spi2_ss"),
+	PINCTRL_PIN(66, "spi3_clk"),
+	PINCTRL_PIN(67, "spi3_mosi"),
+	PINCTRL_PIN(68, "spi3_miso"),
+	PINCTRL_PIN(69, "spi3_ss"),
+	PINCTRL_PIN(70, "uart0_cts"),
+	PINCTRL_PIN(71, "uart0_rts"),
+	PINCTRL_PIN(72, "uart0_rx"),
+	PINCTRL_PIN(73, "uart0_tx"),
+	PINCTRL_PIN(74, "uart1_cts"),
+	PINCTRL_PIN(75, "uart1_dcd"),
+	PINCTRL_PIN(76, "uart1_dsr"),
+	PINCTRL_PIN(77, "uart1_dtr"),
+	PINCTRL_PIN(78, "uart1_ri"),
+	PINCTRL_PIN(79, "uart1_rts"),
+	PINCTRL_PIN(80, "uart1_rx"),
+	PINCTRL_PIN(81, "uart1_tx"),
+	PINCTRL_PIN(82, "uart3_rx"),
+	PINCTRL_PIN(83, "uart3_tx"),
+	PINCTRL_PIN(84, "sdio1_clk_sdcard"),
+	PINCTRL_PIN(85, "sdio1_cmd"),
+	PINCTRL_PIN(86, "sdio1_data0"),
+	PINCTRL_PIN(87, "sdio1_data1"),
+	PINCTRL_PIN(88, "sdio1_data2"),
+	PINCTRL_PIN(89, "sdio1_data3"),
+	PINCTRL_PIN(90, "sdio1_wp_n"),
+	PINCTRL_PIN(91, "sdio1_card_rst"),
+	PINCTRL_PIN(92, "sdio1_led_on"),
+	PINCTRL_PIN(93, "sdio1_cd"),
+	PINCTRL_PIN(94, "sdio0_clk_sdcard"),
+	PINCTRL_PIN(95, "sdio0_cmd"),
+	PINCTRL_PIN(96, "sdio0_data0"),
+	PINCTRL_PIN(97, "sdio0_data1"),
+	PINCTRL_PIN(98, "sdio0_data2"),
+	PINCTRL_PIN(99, "sdio0_data3"),
+	PINCTRL_PIN(100, "sdio0_wp_n"),
+	PINCTRL_PIN(101, "sdio0_card_rst"),
+	PINCTRL_PIN(102, "sdio0_led_on"),
+	PINCTRL_PIN(103, "sdio0_cd"),
+	PINCTRL_PIN(104, "sflash_clk"),
+	PINCTRL_PIN(105, "sflash_cs_l"),
+	PINCTRL_PIN(106, "sflash_mosi"),
+	PINCTRL_PIN(107, "sflash_miso"),
+	PINCTRL_PIN(108, "sflash_wp_n"),
+	PINCTRL_PIN(109, "sflash_hold_n"),
+	PINCTRL_PIN(110, "nand_ale"),
+	PINCTRL_PIN(111, "nand_ce0_l"),
+	PINCTRL_PIN(112, "nand_ce1_l"),
+	PINCTRL_PIN(113, "nand_cle"),
+	PINCTRL_PIN(114, "nand_dq0"),
+	PINCTRL_PIN(115, "nand_dq1"),
+	PINCTRL_PIN(116, "nand_dq2"),
+	PINCTRL_PIN(117, "nand_dq3"),
+	PINCTRL_PIN(118, "nand_dq4"),
+	PINCTRL_PIN(119, "nand_dq5"),
+	PINCTRL_PIN(120, "nand_dq6"),
+	PINCTRL_PIN(121, "nand_dq7"),
+	PINCTRL_PIN(122, "nand_rb_l"),
+	PINCTRL_PIN(123, "nand_re_l"),
+	PINCTRL_PIN(124, "nand_we_l"),
+	PINCTRL_PIN(125, "nand_wp_l"),
+	PINCTRL_PIN(126, "lcd_clac"),
+	PINCTRL_PIN(127, "lcd_clcp"),
+	PINCTRL_PIN(128, "lcd_cld0"),
+	PINCTRL_PIN(129, "lcd_cld1"),
+	PINCTRL_PIN(130, "lcd_cld10"),
+	PINCTRL_PIN(131, "lcd_cld11"),
+	PINCTRL_PIN(132, "lcd_cld12"),
+	PINCTRL_PIN(133, "lcd_cld13"),
+	PINCTRL_PIN(134, "lcd_cld14"),
+	PINCTRL_PIN(135, "lcd_cld15"),
+	PINCTRL_PIN(136, "lcd_cld16"),
+	PINCTRL_PIN(137, "lcd_cld17"),
+	PINCTRL_PIN(138, "lcd_cld18"),
+	PINCTRL_PIN(139, "lcd_cld19"),
+	PINCTRL_PIN(140, "lcd_cld2"),
+	PINCTRL_PIN(141, "lcd_cld20"),
+	PINCTRL_PIN(142, "lcd_cld21"),
+	PINCTRL_PIN(143, "lcd_cld22"),
+	PINCTRL_PIN(144, "lcd_cld23"),
+	PINCTRL_PIN(145, "lcd_cld3"),
+	PINCTRL_PIN(146, "lcd_cld4"),
+	PINCTRL_PIN(147, "lcd_cld5"),
+	PINCTRL_PIN(148, "lcd_cld6"),
+	PINCTRL_PIN(149, "lcd_cld7"),
+	PINCTRL_PIN(150, "lcd_cld8"),
+	PINCTRL_PIN(151, "lcd_cld9"),
+	PINCTRL_PIN(152, "lcd_clfp"),
+	PINCTRL_PIN(153, "lcd_clle"),
+	PINCTRL_PIN(154, "lcd_cllp"),
+	PINCTRL_PIN(155, "lcd_clpower"),
+	PINCTRL_PIN(156, "camera_vsync"),
+	PINCTRL_PIN(157, "camera_trigger"),
+	PINCTRL_PIN(158, "camera_strobe"),
+	PINCTRL_PIN(159, "camera_standby"),
+	PINCTRL_PIN(160, "camera_reset_n"),
+	PINCTRL_PIN(161, "camera_pixdata9"),
+	PINCTRL_PIN(162, "camera_pixdata8"),
+	PINCTRL_PIN(163, "camera_pixdata7"),
+	PINCTRL_PIN(164, "camera_pixdata6"),
+	PINCTRL_PIN(165, "camera_pixdata5"),
+	PINCTRL_PIN(166, "camera_pixdata4"),
+	PINCTRL_PIN(167, "camera_pixdata3"),
+	PINCTRL_PIN(168, "camera_pixdata2"),
+	PINCTRL_PIN(169, "camera_pixdata1"),
+	PINCTRL_PIN(170, "camera_pixdata0"),
+	PINCTRL_PIN(171, "camera_pixclk"),
+	PINCTRL_PIN(172, "camera_hsync"),
+	PINCTRL_PIN(173, "camera_pll_ref_clk"),
+	PINCTRL_PIN(174, "usb_id_indication"),
+	PINCTRL_PIN(175, "usb_vbus_indication"),
+	PINCTRL_PIN(176, "gpio0_3p3"),
+	PINCTRL_PIN(177, "gpio1_3p3"),
+	PINCTRL_PIN(178, "gpio2_3p3"),
+	PINCTRL_PIN(179, "gpio3_3p3"),
+};
+
+/*
+ * List of groups of pins
+ */
+static const unsigned gpio0_pins[] = { 12 };
+static const unsigned gpio1_pins[] = { 13 };
+static const unsigned gpio2_pins[] = { 14 };
+static const unsigned gpio3_pins[] = { 15 };
+static const unsigned gpio4_pins[] = { 16 };
+static const unsigned gpio5_pins[] = { 17 };
+static const unsigned gpio6_pins[] = { 18 };
+static const unsigned gpio7_pins[] = { 19 };
+static const unsigned gpio8_pins[] = { 20 };
+static const unsigned gpio9_pins[] = { 21 };
+static const unsigned gpio10_pins[] = { 22 };
+static const unsigned gpio11_pins[] = { 23 };
+static const unsigned gpio12_pins[] = { 24 };
+static const unsigned gpio13_pins[] = { 25 };
+static const unsigned gpio14_pins[] = { 26 };
+static const unsigned gpio15_pins[] = { 27 };
+static const unsigned gpio16_pins[] = { 28 };
+static const unsigned gpio17_pins[] = { 29 };
+static const unsigned gpio18_pins[] = { 30 };
+static const unsigned gpio19_pins[] = { 31 };
+static const unsigned gpio20_pins[] = { 32 };
+static const unsigned gpio21_pins[] = { 33 };
+static const unsigned gpio22_pins[] = { 34 };
+static const unsigned gpio23_pins[] = { 35 };
+static const unsigned pwm0_pins[] = { 38 };
+static const unsigned pwm1_pins[] = { 39 };
+static const unsigned pwm2_pins[] = { 40 };
+static const unsigned pwm3_pins[] = { 41 };
+static const unsigned sdio0_pins[] = { 94, 95, 96, 97, 98, 99 };
+static const unsigned smart_card0_pins[] = { 42, 43, 44, 46, 47 };
+static const unsigned smart_card1_pins[] = { 48, 49, 50, 52, 53 };
+static const unsigned spi0_pins[] = { 54, 55, 56, 57 };
+static const unsigned spi1_pins[] = { 58, 59, 60, 61 };
+static const unsigned spi2_pins[] = { 62, 63, 64, 65 };
+static const unsigned spi3_pins[] = { 66, 67, 68, 69 };
+static const unsigned d1w_pins[] = { 10, 11 };
+static const unsigned lcd_pins[] = { 126, 127, 128, 129, 130, 131, 132,	133,
+	134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147,
+	148, 149, 150, 151, 152, 153, 154, 155 };
+static const unsigned uart0_pins[] = { 70, 71, 72, 73 };
+static const unsigned uart1_dte_pins[] = { 75, 76, 77, 78 };
+static const unsigned uart1_pins[] = { 74, 79, 80, 81 };
+static const unsigned uart3_pins[] = { 82, 83 };
+static const unsigned qspi_pins[] = { 104, 105, 106, 107 };
+static const unsigned nand_pins[] = { 110, 111, 112, 113, 114, 115, 116, 117,
+	118, 119, 120, 121, 122, 123, 124, 125 };
+static const unsigned sdio0_cd_pins[] = { 103 };
+static const unsigned sdio0_mmc_pins[] = { 100, 101, 102 };
+static const unsigned can0_spi4_pins[] = { 86, 87 };
+static const unsigned can1_spi4_pins[] = { 88, 89 };
+static const unsigned sdio1_cd_pins[] = { 93 };
+static const unsigned sdio1_led_pins[] = { 84, 85 };
+static const unsigned sdio1_mmc_pins[] = { 90, 91, 92 };
+static const unsigned camera_led_pins[] = { 156, 157, 158, 159, 160 };
+static const unsigned camera_rgmii_pins[] = { 169, 170, 171, 169, 170, 171,
+	172, 173 };
+static const unsigned camera_sram_rgmii_pins[] = { 161, 162, 163, 164, 165,
+	166, 167, 168 };
+static const unsigned qspi_gpio_pins[] = { 108, 109 };
+static const unsigned smart_card0_fcb_pins[] = { 45 };
+static const unsigned smart_card1_fcb_pins[] = { 51 };
+static const unsigned gpio0_3p3_pins[] = { 176 };
+static const unsigned gpio1_3p3_pins[] = { 177 };
+static const unsigned gpio2_3p3_pins[] = { 178 };
+
+/*
+ * List of groups names. Need to match the order in cygnus_pin_groups
+ */
+static const char * const cygnus_pin_group_names[] = {
+	"gpio0",
+	"gpio1",
+	"gpio2",
+	"gpio3",
+	"gpio4",
+	"gpio5",
+	"gpio6",
+	"gpio7",
+	"gpio8",
+	"gpio9",
+	"gpio10",
+	"gpio11",
+	"gpio12",
+	"gpio13",
+	"gpio14",
+	"gpio15",
+	"gpio16",
+	"gpio17",
+	"gpio18",
+	"gpio19",
+	"gpio20",
+	"gpio21",
+	"gpio22",
+	"gpio23",
+	"pwm0",
+	"pwm1",
+	"pwm2",
+	"pwm3",
+	"sdio0",
+	"smart_card0",
+	"smart_card1",
+	"spi0",
+	"spi1",
+	"spi2",
+	"spi3",
+	"d1w",
+	"lcd",
+	"uart0",
+	"uart1_dte",
+	"uart1",
+	"uart3",
+	"qspi",
+	"nand",
+	"sdio0_cd",
+	"sdio0_mmc",
+	"can0_spi4",
+	"can1_spi4",
+	"sdio1_cd",
+	"sdio1_led",
+	"sdio1_mmc",
+	"camera_led",
+	"camera_rgmii",
+	"camera_sram_rgmii",
+	"qspi_gpio",
+	"smart_card0_fcb",
+	"smart_card1_fcb",
+	"gpio0_3p3",
+	"gpio1_3p3",
+	"gpio2_3p3",
+};
+
+/*
+ * List of groups. Need to match the order in cygnus_pin_group_names
+ */
+static const struct cygnus_pin_group cygnus_pin_groups[] = {
+	CYGNUS_PIN_GROUP(gpio0, 0x0, 0),
+	CYGNUS_PIN_GROUP(gpio1, 0x0, 4),
+	CYGNUS_PIN_GROUP(gpio2, 0x0, 8),
+	CYGNUS_PIN_GROUP(gpio3, 0x0, 12),
+	CYGNUS_PIN_GROUP(gpio4, 0x0, 16),
+	CYGNUS_PIN_GROUP(gpio5, 0x0, 20),
+	CYGNUS_PIN_GROUP(gpio6, 0x0, 24),
+	CYGNUS_PIN_GROUP(gpio7, 0x0, 28),
+	CYGNUS_PIN_GROUP(gpio8, 0x4, 0),
+	CYGNUS_PIN_GROUP(gpio9, 0x4, 4),
+	CYGNUS_PIN_GROUP(gpio10, 0x4, 8),
+	CYGNUS_PIN_GROUP(gpio11, 0x4, 12),
+	CYGNUS_PIN_GROUP(gpio12, 0x4, 16),
+	CYGNUS_PIN_GROUP(gpio13, 0x4, 20),
+	CYGNUS_PIN_GROUP(gpio14, 0x4, 24),
+	CYGNUS_PIN_GROUP(gpio15, 0x4, 28),
+	CYGNUS_PIN_GROUP(gpio16, 0x8, 0),
+	CYGNUS_PIN_GROUP(gpio17, 0x8, 4),
+	CYGNUS_PIN_GROUP(gpio18, 0x8, 8),
+	CYGNUS_PIN_GROUP(gpio19, 0x8, 12),
+	CYGNUS_PIN_GROUP(gpio20, 0x8, 16),
+	CYGNUS_PIN_GROUP(gpio21, 0x8, 20),
+	CYGNUS_PIN_GROUP(gpio22, 0x8, 24),
+	CYGNUS_PIN_GROUP(gpio23, 0x8, 28),
+	CYGNUS_PIN_GROUP(pwm0, 0xc, 0),
+	CYGNUS_PIN_GROUP(pwm1, 0xc, 4),
+	CYGNUS_PIN_GROUP(pwm2, 0xc, 8),
+	CYGNUS_PIN_GROUP(pwm3, 0xc, 12),
+	CYGNUS_PIN_GROUP(sdio0, 0xc, 16),
+	CYGNUS_PIN_GROUP(smart_card0, 0xc, 20),
+	CYGNUS_PIN_GROUP(smart_card1, 0xc, 24),
+	CYGNUS_PIN_GROUP(spi0, 0x10, 0),
+	CYGNUS_PIN_GROUP(spi1, 0x10, 4),
+	CYGNUS_PIN_GROUP(spi2, 0x10, 8),
+	CYGNUS_PIN_GROUP(spi3, 0x10, 12),
+	CYGNUS_PIN_GROUP(d1w, 0x10, 16),
+	CYGNUS_PIN_GROUP(lcd, 0x10, 20),
+	CYGNUS_PIN_GROUP(uart0, 0x14, 0),
+	CYGNUS_PIN_GROUP(uart1_dte, 0x14, 4),
+	CYGNUS_PIN_GROUP(uart1, 0x14, 8),
+	CYGNUS_PIN_GROUP(uart3, 0x14, 12),
+	CYGNUS_PIN_GROUP(qspi, 0x14, 16),
+	CYGNUS_PIN_GROUP(nand, 0x14, 20),
+	CYGNUS_PIN_GROUP(sdio0_cd, 0x18, 0),
+	CYGNUS_PIN_GROUP(sdio0_mmc, 0x18, 4),
+	CYGNUS_PIN_GROUP(can0_spi4, 0x18, 8),
+	CYGNUS_PIN_GROUP(can1_spi4, 0x18, 12),
+	CYGNUS_PIN_GROUP(sdio1_cd, 0x18, 16),
+	CYGNUS_PIN_GROUP(sdio1_led, 0x18, 20),
+	CYGNUS_PIN_GROUP(sdio1_mmc, 0x18, 24),
+	CYGNUS_PIN_GROUP(camera_led, 0x1c, 0),
+	CYGNUS_PIN_GROUP(camera_rgmii, 0x1c, 4),
+	CYGNUS_PIN_GROUP(camera_sram_rgmii, 0x1c, 8),
+	CYGNUS_PIN_GROUP(qspi_gpio, 0x1c, 12),
+	CYGNUS_PIN_GROUP(smart_card0_fcb, 0x20, 0),
+	CYGNUS_PIN_GROUP(smart_card1_fcb, 0x20, 4),
+	CYGNUS_PIN_GROUP(gpio0_3p3, 0x28, 0),
+	CYGNUS_PIN_GROUP(gpio1_3p3, 0x28, 4),
+	CYGNUS_PIN_GROUP(gpio2_3p3, 0x28, 8),
+};
+
+#define CYGNUS_PIN_FUNCTION(fcn_name, mux_val)			\
+{								\
+	.name = #fcn_name,					\
+	.group_names = cygnus_pin_group_names,			\
+	.num_groups = ARRAY_SIZE(cygnus_pin_group_names),	\
+	.mux = mux_val,						\
+}
+
+/*
+ * Cygnus has 4 alternate functions. All groups can be configured to any of
+ * the 4 alternate functions
+ */
+static const struct cygnus_pin_function cygnus_pin_functions[] = {
+	CYGNUS_PIN_FUNCTION(alt1, 0),
+	CYGNUS_PIN_FUNCTION(alt2, 1),
+	CYGNUS_PIN_FUNCTION(alt3, 2),
+	CYGNUS_PIN_FUNCTION(alt4, 3),
+};
+
+static int cygnus_get_groups_count(struct pinctrl_dev *pctrl_dev)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->num_groups;
+}
+
+static const char *cygnus_get_group_name(struct pinctrl_dev *pctrl_dev,
+		unsigned selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->groups[selector].name;
+}
+
+static int cygnus_get_group_pins(struct pinctrl_dev *pctrl_dev,
+		unsigned selector, const unsigned **pins,
+		unsigned *num_pins)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	*pins = pinctrl->groups[selector].pins;
+	*num_pins = pinctrl->groups[selector].num_pins;
+
+	return 0;
+}
+
+static void cygnus_pin_dbg_show(struct pinctrl_dev *pctrl_dev,
+		struct seq_file *s, unsigned offset)
+{
+	seq_printf(s, " %s", dev_name(pctrl_dev->dev));
+}
+
+static int find_matched_function(const char *function_name)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(cygnus_pin_functions); i++) {
+		if (!strcmp(cygnus_pin_functions[i].name, function_name))
+			return (int)cygnus_pin_functions[i].mux;
+	}
+
+	return -EINVAL;
+}
+
+static int cygnus_dt_node_to_map(struct pinctrl_dev *pctrl_dev,
+		struct device_node *np, struct pinctrl_map **map,
+		unsigned *num_maps)
+{
+	int ret, num_groups;
+	unsigned reserved_maps = 0;
+	struct property *prop;
+	const char *group_name, *function_name;
+
+	*map = NULL;
+	*num_maps = 0;
+
+	num_groups = of_property_count_strings(np, "brcm,groups");
+	if (num_groups < 0) {
+		dev_err(pctrl_dev->dev,
+			"could not parse property brcm,groups\n");
+		return -EINVAL;
+	}
+
+	ret = of_property_read_string(np, "brcm,function", &function_name);
+	if (ret < 0) {
+		dev_err(pctrl_dev->dev,
+			"could not parse property brcm,function\n");
+		return -EINVAL;
+	}
+
+	/* make sure it's a valid alternate function */
+	ret = find_matched_function(function_name);
+	if (ret < 0) {
+		dev_err(pctrl_dev->dev, "invalid function name: %s\n",
+				function_name);
+	}
+
+	ret = pinctrl_utils_reserve_map(pctrl_dev, map, &reserved_maps,
+			num_maps, num_groups);
+	if (ret) {
+		dev_err(pctrl_dev->dev, "unable to reserve map\n");
+		return ret;
+	}
+
+	of_property_for_each_string(np, "brcm,groups", prop, group_name) {
+		ret = pinctrl_utils_add_map_mux(pctrl_dev, map,
+				&reserved_maps, num_maps, group_name,
+				function_name);
+		if (ret) {
+			dev_err(pctrl_dev->dev, "can't add map: %d\n", ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static struct pinctrl_ops cygnus_pinctrl_ops = {
+	.get_groups_count = cygnus_get_groups_count,
+	.get_group_name = cygnus_get_group_name,
+	.get_group_pins = cygnus_get_group_pins,
+	.pin_dbg_show = cygnus_pin_dbg_show,
+	.dt_node_to_map = cygnus_dt_node_to_map,
+	.dt_free_map = pinctrl_utils_dt_free_map,
+};
+
+static int cygnus_get_functions_count(struct pinctrl_dev *pctrl_dev)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->num_functions;
+}
+
+static const char *cygnus_get_function_name(struct pinctrl_dev *pctrl_dev,
+		unsigned selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->functions[selector].name;
+}
+
+static int cygnus_get_function_groups(struct pinctrl_dev *pctrl_dev,
+	unsigned selector, const char * const **groups,
+	unsigned * const num_groups)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	*groups = pinctrl->functions[selector].group_names;
+	*num_groups = pinctrl->functions[selector].num_groups;
+
+	return 0;
+}
+
+static int cygnus_pinmux_set_mux(struct pinctrl_dev *pctrl_dev,
+		unsigned function_selector, unsigned group_selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+	const struct cygnus_pin_function *function =
+			&pinctrl->functions[function_selector];
+	const struct cygnus_pin_group *group =
+			&pinctrl->groups[group_selector];
+	u32 val, mask = 0x7;
+
+	dev_dbg(pctrl_dev->dev,
+	"group:%s with offset:0x%08x shift:%u set to function: %s mux:%u\n",
+		group->name, group->offset, group->shift, function->name,
+		function->mux);
+
+	val = readl(pinctrl->base + group->offset);
+	val &= ~(mask << group->shift);
+	val |= function->mux << group->shift;
+	writel(val, pinctrl->base + group->offset);
+
+	return 0;
+}
+
+static struct pinmux_ops cygnus_pinmux_ops = {
+	.get_functions_count = cygnus_get_functions_count,
+	.get_function_name = cygnus_get_function_name,
+	.get_function_groups = cygnus_get_function_groups,
+	.set_mux = cygnus_pinmux_set_mux,
+};
+
+static struct pinctrl_desc cygnus_pinctrl_desc = {
+	.pctlops = &cygnus_pinctrl_ops,
+	.pmxops = &cygnus_pinmux_ops,
+	.owner = THIS_MODULE,
+};
+
+static int cygnus_pinctrl_probe(struct platform_device *pdev)
+{
+	struct cygnus_pinctrl *pinctrl;
+	struct resource *res;
+
+	pinctrl = devm_kzalloc(&pdev->dev, sizeof(*pinctrl), GFP_KERNEL);
+	if (!pinctrl) {
+		dev_err(&pdev->dev, "unable to allocate memory\n");
+		return -ENOMEM;
+	}
+	pinctrl->dev = &pdev->dev;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "unable to get resource\n");
+		return -ENOENT;
+	}
+
+	pinctrl->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(pinctrl->base)) {
+		dev_err(&pdev->dev, "unable to map I/O space\n");
+		return PTR_ERR(pinctrl->base);
+	}
+
+	pinctrl->pins = cygnus_pinctrl_pins;
+	pinctrl->num_pins = ARRAY_SIZE(cygnus_pinctrl_pins);
+	pinctrl->groups = cygnus_pin_groups;
+	pinctrl->num_groups = ARRAY_SIZE(cygnus_pin_groups);
+	pinctrl->functions = cygnus_pin_functions;
+	pinctrl->num_functions = ARRAY_SIZE(cygnus_pin_functions);
+
+	cygnus_pinctrl_desc.name = dev_name(&pdev->dev);
+	cygnus_pinctrl_desc.pins = cygnus_pinctrl_pins;
+	cygnus_pinctrl_desc.npins = ARRAY_SIZE(cygnus_pinctrl_pins);
+
+	pinctrl->pctl = pinctrl_register(&cygnus_pinctrl_desc, &pdev->dev,
+			pinctrl);
+	if (!pinctrl->pctl) {
+		dev_err(&pdev->dev, "unable to register cygnus pinctrl\n");
+		return -EINVAL;
+	}
+
+	platform_set_drvdata(pdev, pinctrl);
+
+	return 0;
+}
+
+static int cygnus_pinctrl_remove(struct platform_device *pdev)
+{
+	struct cygnus_pinctrl *pinctrl = platform_get_drvdata(pdev);
+
+	pinctrl_unregister(pinctrl->pctl);
+	platform_set_drvdata(pdev, NULL);
+
+	return 0;
+}
+
+static struct of_device_id cygnus_pinctrl_of_match[] = {
+	{ .compatible = "brcm,cygnus-pinctrl", },
+	{ },
+};
+
+static struct platform_driver cygnus_pinctrl_driver = {
+	.driver = {
+		.name = "cygnus-pinctrl",
+		.owner = THIS_MODULE,
+		.of_match_table = cygnus_pinctrl_of_match,
+	},
+	.probe = cygnus_pinctrl_probe,
+	.remove = cygnus_pinctrl_remove,
+};
+
+static int __init cygnus_pinctrl_init(void)
+{
+	return platform_driver_register(&cygnus_pinctrl_driver);
+}
+arch_initcall(cygnus_pinctrl_init);
+
+static void __exit cygnus_pinctrl_exit(void)
+{
+	platform_driver_unregister(&cygnus_pinctrl_driver);
+}
+module_exit(cygnus_pinctrl_exit);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus pinctrl driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH 2/4] pinctrl: cygnus: add initial pinctrl support

[Ray Jui]

This adds the initial driver support for the Broadcom Cygnus pinctrl
controller. The Cygnus pinctrl controller supports group based
alternate function configuration

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
---
 drivers/pinctrl/Kconfig              |    7 +
 drivers/pinctrl/Makefile             |    1 +
 drivers/pinctrl/pinctrl-bcm-cygnus.c |  753 ++++++++++++++++++++++++++++++++++
 3 files changed, 761 insertions(+)
 create mode 100644 drivers/pinctrl/pinctrl-bcm-cygnus.c

diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index d014f22..4549e9f 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -85,6 +85,13 @@ config PINCTRL_BCM281XX
 	  BCM28145, and BCM28155 SoCs.  This driver requires the pinctrl
 	  framework.  GPIO is provided by a separate GPIO driver.
 
+config PINCTRL_BCM_CYGNUS
+	bool "Broadcom Cygnus pinctrl driver"
+	depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
+	select PINMUX
+	select PINCONF
+	select GENERIC_PINCONF
+
 config PINCTRL_LANTIQ
 	bool
 	depends on LANTIQ
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index c030b3d..4ed8e8a 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_PINCTRL_BF60x)	+= pinctrl-adi2-bf60x.o
 obj-$(CONFIG_PINCTRL_AT91)	+= pinctrl-at91.o
 obj-$(CONFIG_PINCTRL_BCM2835)	+= pinctrl-bcm2835.o
 obj-$(CONFIG_PINCTRL_BCM281XX)	+= pinctrl-bcm281xx.o
+obj-$(CONFIG_PINCTRL_BCM_CYGNUS)	+= pinctrl-bcm-cygnus.o
 obj-$(CONFIG_PINCTRL_FALCON)	+= pinctrl-falcon.o
 obj-$(CONFIG_PINCTRL_PALMAS)	+= pinctrl-palmas.o
 obj-$(CONFIG_PINCTRL_ROCKCHIP)	+= pinctrl-rockchip.o
diff --git a/drivers/pinctrl/pinctrl-bcm-cygnus.c b/drivers/pinctrl/pinctrl-bcm-cygnus.c
new file mode 100644
index 0000000..eb6e27a
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-bcm-cygnus.c
@@ -0,0 +1,753 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/slab.h>
+
+#include "core.h"
+#include "pinctrl-utils.h"
+
+/*
+ * Alternate function configuration
+ *
+ * @name: name of the alternate function
+ * @group_names: array of strings of group names that can be supported by this
+ * alternate function
+ * @num_groups: total number of groups that can be supported by this alternate
+ * function
+ * @mux: mux setting for this alternate function to be programed
+ */
+struct cygnus_pin_function {
+	const char *name;
+	const char * const *group_names;
+	const unsigned num_groups;
+	unsigned int mux;
+};
+
+/*
+ * Cygnus allows group based pinmux configuration
+ *
+ * @name: name of the group
+ * @pins: array of pins used by this group
+ * @num_pins: total number of pins used by this group
+ * @offset: register offset for pinmux configuration of this group
+ * @shift: bit shift for pinmux configuration of this group
+ */
+struct cygnus_pin_group {
+	const char *name;
+	const unsigned *pins;
+	const unsigned num_pins;
+	const unsigned int offset;
+	const unsigned int shift;
+};
+
+/*
+ * Cygnus pinctrl core
+ *
+ * @pctl: pointer to pinctrl_dev
+ * @dev: pointer to the device
+ * @base: I/O register base for Cygnus pinctrl configuration
+ *
+ */
+struct cygnus_pinctrl {
+	struct pinctrl_dev *pctl;
+	struct device *dev;
+	void __iomem *base;
+
+	const struct pinctrl_pin_desc *pins;
+	unsigned num_pins;
+
+	const struct cygnus_pin_group *groups;
+	unsigned num_groups;
+
+	const struct cygnus_pin_function *functions;
+	unsigned num_functions;
+};
+
+#define CYGNUS_PIN_GROUP(group_name, off, sh)		\
+{							\
+	.name = #group_name,				\
+	.pins = group_name##_pins,			\
+	.num_pins = ARRAY_SIZE(group_name##_pins),	\
+	.offset = off,					\
+	.shift = sh,					\
+}
+
+/*
+ * The following pin description is based on Cygnus I/O MUX spreadsheet
+ */
+static const struct pinctrl_pin_desc cygnus_pinctrl_pins[] = {
+	PINCTRL_PIN(0, "ext_device_reset_n"),
+	PINCTRL_PIN(1, "chip_mode0"),
+	PINCTRL_PIN(2, "chip_mode1"),
+	PINCTRL_PIN(3, "chip_mode2"),
+	PINCTRL_PIN(4, "chip_mode3"),
+	PINCTRL_PIN(5, "chip_mode4"),
+	PINCTRL_PIN(6, "bsc0_scl"),
+	PINCTRL_PIN(7, "bsc0_sda"),
+	PINCTRL_PIN(8, "bsc1_scl"),
+	PINCTRL_PIN(9, "bsc1_sda"),
+	PINCTRL_PIN(10, "d1w_dq"),
+	PINCTRL_PIN(11, "d1wowstz_l"),
+	PINCTRL_PIN(12, "gpio0"),
+	PINCTRL_PIN(13, "gpio1"),
+	PINCTRL_PIN(14, "gpio2"),
+	PINCTRL_PIN(15, "gpio3"),
+	PINCTRL_PIN(16, "gpio4"),
+	PINCTRL_PIN(17, "gpio5"),
+	PINCTRL_PIN(18, "gpio6"),
+	PINCTRL_PIN(19, "gpio7"),
+	PINCTRL_PIN(20, "gpio8"),
+	PINCTRL_PIN(21, "gpio9"),
+	PINCTRL_PIN(22, "gpio10"),
+	PINCTRL_PIN(23, "gpio11"),
+	PINCTRL_PIN(24, "gpio12"),
+	PINCTRL_PIN(25, "gpio13"),
+	PINCTRL_PIN(26, "gpio14"),
+	PINCTRL_PIN(27, "gpio15"),
+	PINCTRL_PIN(28, "gpio16"),
+	PINCTRL_PIN(29, "gpio17"),
+	PINCTRL_PIN(30, "gpio18"),
+	PINCTRL_PIN(31, "gpio19"),
+	PINCTRL_PIN(32, "gpio20"),
+	PINCTRL_PIN(33, "gpio21"),
+	PINCTRL_PIN(34, "gpio22"),
+	PINCTRL_PIN(35, "gpio23"),
+	PINCTRL_PIN(36, "mdc"),
+	PINCTRL_PIN(37, "mdio"),
+	PINCTRL_PIN(38, "pwm0"),
+	PINCTRL_PIN(39, "pwm1"),
+	PINCTRL_PIN(40, "pwm2"),
+	PINCTRL_PIN(41, "pwm3"),
+	PINCTRL_PIN(42, "sc0_clk"),
+	PINCTRL_PIN(43, "sc0_cmdvcc_l"),
+	PINCTRL_PIN(44, "sc0_detect"),
+	PINCTRL_PIN(45, "sc0_fcb"),
+	PINCTRL_PIN(46, "sc0_io"),
+	PINCTRL_PIN(47, "sc0_rst_l"),
+	PINCTRL_PIN(48, "sc1_clk"),
+	PINCTRL_PIN(49, "sc1_cmdvcc_l"),
+	PINCTRL_PIN(50, "sc1_detect"),
+	PINCTRL_PIN(51, "sc1_fcb"),
+	PINCTRL_PIN(52, "sc1_io"),
+	PINCTRL_PIN(53, "sc1_rst_l"),
+	PINCTRL_PIN(54, "spi0_clk"),
+	PINCTRL_PIN(55, "spi0_mosi"),
+	PINCTRL_PIN(56, "spi0_miso"),
+	PINCTRL_PIN(57, "spi0_ss"),
+	PINCTRL_PIN(58, "spi1_clk"),
+	PINCTRL_PIN(59, "spi1_mosi"),
+	PINCTRL_PIN(60, "spi1_miso"),
+	PINCTRL_PIN(61, "spi1_ss"),
+	PINCTRL_PIN(62, "spi2_clk"),
+	PINCTRL_PIN(63, "spi2_mosi"),
+	PINCTRL_PIN(64, "spi2_miso"),
+	PINCTRL_PIN(65, "spi2_ss"),
+	PINCTRL_PIN(66, "spi3_clk"),
+	PINCTRL_PIN(67, "spi3_mosi"),
+	PINCTRL_PIN(68, "spi3_miso"),
+	PINCTRL_PIN(69, "spi3_ss"),
+	PINCTRL_PIN(70, "uart0_cts"),
+	PINCTRL_PIN(71, "uart0_rts"),
+	PINCTRL_PIN(72, "uart0_rx"),
+	PINCTRL_PIN(73, "uart0_tx"),
+	PINCTRL_PIN(74, "uart1_cts"),
+	PINCTRL_PIN(75, "uart1_dcd"),
+	PINCTRL_PIN(76, "uart1_dsr"),
+	PINCTRL_PIN(77, "uart1_dtr"),
+	PINCTRL_PIN(78, "uart1_ri"),
+	PINCTRL_PIN(79, "uart1_rts"),
+	PINCTRL_PIN(80, "uart1_rx"),
+	PINCTRL_PIN(81, "uart1_tx"),
+	PINCTRL_PIN(82, "uart3_rx"),
+	PINCTRL_PIN(83, "uart3_tx"),
+	PINCTRL_PIN(84, "sdio1_clk_sdcard"),
+	PINCTRL_PIN(85, "sdio1_cmd"),
+	PINCTRL_PIN(86, "sdio1_data0"),
+	PINCTRL_PIN(87, "sdio1_data1"),
+	PINCTRL_PIN(88, "sdio1_data2"),
+	PINCTRL_PIN(89, "sdio1_data3"),
+	PINCTRL_PIN(90, "sdio1_wp_n"),
+	PINCTRL_PIN(91, "sdio1_card_rst"),
+	PINCTRL_PIN(92, "sdio1_led_on"),
+	PINCTRL_PIN(93, "sdio1_cd"),
+	PINCTRL_PIN(94, "sdio0_clk_sdcard"),
+	PINCTRL_PIN(95, "sdio0_cmd"),
+	PINCTRL_PIN(96, "sdio0_data0"),
+	PINCTRL_PIN(97, "sdio0_data1"),
+	PINCTRL_PIN(98, "sdio0_data2"),
+	PINCTRL_PIN(99, "sdio0_data3"),
+	PINCTRL_PIN(100, "sdio0_wp_n"),
+	PINCTRL_PIN(101, "sdio0_card_rst"),
+	PINCTRL_PIN(102, "sdio0_led_on"),
+	PINCTRL_PIN(103, "sdio0_cd"),
+	PINCTRL_PIN(104, "sflash_clk"),
+	PINCTRL_PIN(105, "sflash_cs_l"),
+	PINCTRL_PIN(106, "sflash_mosi"),
+	PINCTRL_PIN(107, "sflash_miso"),
+	PINCTRL_PIN(108, "sflash_wp_n"),
+	PINCTRL_PIN(109, "sflash_hold_n"),
+	PINCTRL_PIN(110, "nand_ale"),
+	PINCTRL_PIN(111, "nand_ce0_l"),
+	PINCTRL_PIN(112, "nand_ce1_l"),
+	PINCTRL_PIN(113, "nand_cle"),
+	PINCTRL_PIN(114, "nand_dq0"),
+	PINCTRL_PIN(115, "nand_dq1"),
+	PINCTRL_PIN(116, "nand_dq2"),
+	PINCTRL_PIN(117, "nand_dq3"),
+	PINCTRL_PIN(118, "nand_dq4"),
+	PINCTRL_PIN(119, "nand_dq5"),
+	PINCTRL_PIN(120, "nand_dq6"),
+	PINCTRL_PIN(121, "nand_dq7"),
+	PINCTRL_PIN(122, "nand_rb_l"),
+	PINCTRL_PIN(123, "nand_re_l"),
+	PINCTRL_PIN(124, "nand_we_l"),
+	PINCTRL_PIN(125, "nand_wp_l"),
+	PINCTRL_PIN(126, "lcd_clac"),
+	PINCTRL_PIN(127, "lcd_clcp"),
+	PINCTRL_PIN(128, "lcd_cld0"),
+	PINCTRL_PIN(129, "lcd_cld1"),
+	PINCTRL_PIN(130, "lcd_cld10"),
+	PINCTRL_PIN(131, "lcd_cld11"),
+	PINCTRL_PIN(132, "lcd_cld12"),
+	PINCTRL_PIN(133, "lcd_cld13"),
+	PINCTRL_PIN(134, "lcd_cld14"),
+	PINCTRL_PIN(135, "lcd_cld15"),
+	PINCTRL_PIN(136, "lcd_cld16"),
+	PINCTRL_PIN(137, "lcd_cld17"),
+	PINCTRL_PIN(138, "lcd_cld18"),
+	PINCTRL_PIN(139, "lcd_cld19"),
+	PINCTRL_PIN(140, "lcd_cld2"),
+	PINCTRL_PIN(141, "lcd_cld20"),
+	PINCTRL_PIN(142, "lcd_cld21"),
+	PINCTRL_PIN(143, "lcd_cld22"),
+	PINCTRL_PIN(144, "lcd_cld23"),
+	PINCTRL_PIN(145, "lcd_cld3"),
+	PINCTRL_PIN(146, "lcd_cld4"),
+	PINCTRL_PIN(147, "lcd_cld5"),
+	PINCTRL_PIN(148, "lcd_cld6"),
+	PINCTRL_PIN(149, "lcd_cld7"),
+	PINCTRL_PIN(150, "lcd_cld8"),
+	PINCTRL_PIN(151, "lcd_cld9"),
+	PINCTRL_PIN(152, "lcd_clfp"),
+	PINCTRL_PIN(153, "lcd_clle"),
+	PINCTRL_PIN(154, "lcd_cllp"),
+	PINCTRL_PIN(155, "lcd_clpower"),
+	PINCTRL_PIN(156, "camera_vsync"),
+	PINCTRL_PIN(157, "camera_trigger"),
+	PINCTRL_PIN(158, "camera_strobe"),
+	PINCTRL_PIN(159, "camera_standby"),
+	PINCTRL_PIN(160, "camera_reset_n"),
+	PINCTRL_PIN(161, "camera_pixdata9"),
+	PINCTRL_PIN(162, "camera_pixdata8"),
+	PINCTRL_PIN(163, "camera_pixdata7"),
+	PINCTRL_PIN(164, "camera_pixdata6"),
+	PINCTRL_PIN(165, "camera_pixdata5"),
+	PINCTRL_PIN(166, "camera_pixdata4"),
+	PINCTRL_PIN(167, "camera_pixdata3"),
+	PINCTRL_PIN(168, "camera_pixdata2"),
+	PINCTRL_PIN(169, "camera_pixdata1"),
+	PINCTRL_PIN(170, "camera_pixdata0"),
+	PINCTRL_PIN(171, "camera_pixclk"),
+	PINCTRL_PIN(172, "camera_hsync"),
+	PINCTRL_PIN(173, "camera_pll_ref_clk"),
+	PINCTRL_PIN(174, "usb_id_indication"),
+	PINCTRL_PIN(175, "usb_vbus_indication"),
+	PINCTRL_PIN(176, "gpio0_3p3"),
+	PINCTRL_PIN(177, "gpio1_3p3"),
+	PINCTRL_PIN(178, "gpio2_3p3"),
+	PINCTRL_PIN(179, "gpio3_3p3"),
+};
+
+/*
+ * List of groups of pins
+ */
+static const unsigned gpio0_pins[] = { 12 };
+static const unsigned gpio1_pins[] = { 13 };
+static const unsigned gpio2_pins[] = { 14 };
+static const unsigned gpio3_pins[] = { 15 };
+static const unsigned gpio4_pins[] = { 16 };
+static const unsigned gpio5_pins[] = { 17 };
+static const unsigned gpio6_pins[] = { 18 };
+static const unsigned gpio7_pins[] = { 19 };
+static const unsigned gpio8_pins[] = { 20 };
+static const unsigned gpio9_pins[] = { 21 };
+static const unsigned gpio10_pins[] = { 22 };
+static const unsigned gpio11_pins[] = { 23 };
+static const unsigned gpio12_pins[] = { 24 };
+static const unsigned gpio13_pins[] = { 25 };
+static const unsigned gpio14_pins[] = { 26 };
+static const unsigned gpio15_pins[] = { 27 };
+static const unsigned gpio16_pins[] = { 28 };
+static const unsigned gpio17_pins[] = { 29 };
+static const unsigned gpio18_pins[] = { 30 };
+static const unsigned gpio19_pins[] = { 31 };
+static const unsigned gpio20_pins[] = { 32 };
+static const unsigned gpio21_pins[] = { 33 };
+static const unsigned gpio22_pins[] = { 34 };
+static const unsigned gpio23_pins[] = { 35 };
+static const unsigned pwm0_pins[] = { 38 };
+static const unsigned pwm1_pins[] = { 39 };
+static const unsigned pwm2_pins[] = { 40 };
+static const unsigned pwm3_pins[] = { 41 };
+static const unsigned sdio0_pins[] = { 94, 95, 96, 97, 98, 99 };
+static const unsigned smart_card0_pins[] = { 42, 43, 44, 46, 47 };
+static const unsigned smart_card1_pins[] = { 48, 49, 50, 52, 53 };
+static const unsigned spi0_pins[] = { 54, 55, 56, 57 };
+static const unsigned spi1_pins[] = { 58, 59, 60, 61 };
+static const unsigned spi2_pins[] = { 62, 63, 64, 65 };
+static const unsigned spi3_pins[] = { 66, 67, 68, 69 };
+static const unsigned d1w_pins[] = { 10, 11 };
+static const unsigned lcd_pins[] = { 126, 127, 128, 129, 130, 131, 132,	133,
+	134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147,
+	148, 149, 150, 151, 152, 153, 154, 155 };
+static const unsigned uart0_pins[] = { 70, 71, 72, 73 };
+static const unsigned uart1_dte_pins[] = { 75, 76, 77, 78 };
+static const unsigned uart1_pins[] = { 74, 79, 80, 81 };
+static const unsigned uart3_pins[] = { 82, 83 };
+static const unsigned qspi_pins[] = { 104, 105, 106, 107 };
+static const unsigned nand_pins[] = { 110, 111, 112, 113, 114, 115, 116, 117,
+	118, 119, 120, 121, 122, 123, 124, 125 };
+static const unsigned sdio0_cd_pins[] = { 103 };
+static const unsigned sdio0_mmc_pins[] = { 100, 101, 102 };
+static const unsigned can0_spi4_pins[] = { 86, 87 };
+static const unsigned can1_spi4_pins[] = { 88, 89 };
+static const unsigned sdio1_cd_pins[] = { 93 };
+static const unsigned sdio1_led_pins[] = { 84, 85 };
+static const unsigned sdio1_mmc_pins[] = { 90, 91, 92 };
+static const unsigned camera_led_pins[] = { 156, 157, 158, 159, 160 };
+static const unsigned camera_rgmii_pins[] = { 169, 170, 171, 169, 170, 171,
+	172, 173 };
+static const unsigned camera_sram_rgmii_pins[] = { 161, 162, 163, 164, 165,
+	166, 167, 168 };
+static const unsigned qspi_gpio_pins[] = { 108, 109 };
+static const unsigned smart_card0_fcb_pins[] = { 45 };
+static const unsigned smart_card1_fcb_pins[] = { 51 };
+static const unsigned gpio0_3p3_pins[] = { 176 };
+static const unsigned gpio1_3p3_pins[] = { 177 };
+static const unsigned gpio2_3p3_pins[] = { 178 };
+
+/*
+ * List of groups names. Need to match the order in cygnus_pin_groups
+ */
+static const char * const cygnus_pin_group_names[] = {
+	"gpio0",
+	"gpio1",
+	"gpio2",
+	"gpio3",
+	"gpio4",
+	"gpio5",
+	"gpio6",
+	"gpio7",
+	"gpio8",
+	"gpio9",
+	"gpio10",
+	"gpio11",
+	"gpio12",
+	"gpio13",
+	"gpio14",
+	"gpio15",
+	"gpio16",
+	"gpio17",
+	"gpio18",
+	"gpio19",
+	"gpio20",
+	"gpio21",
+	"gpio22",
+	"gpio23",
+	"pwm0",
+	"pwm1",
+	"pwm2",
+	"pwm3",
+	"sdio0",
+	"smart_card0",
+	"smart_card1",
+	"spi0",
+	"spi1",
+	"spi2",
+	"spi3",
+	"d1w",
+	"lcd",
+	"uart0",
+	"uart1_dte",
+	"uart1",
+	"uart3",
+	"qspi",
+	"nand",
+	"sdio0_cd",
+	"sdio0_mmc",
+	"can0_spi4",
+	"can1_spi4",
+	"sdio1_cd",
+	"sdio1_led",
+	"sdio1_mmc",
+	"camera_led",
+	"camera_rgmii",
+	"camera_sram_rgmii",
+	"qspi_gpio",
+	"smart_card0_fcb",
+	"smart_card1_fcb",
+	"gpio0_3p3",
+	"gpio1_3p3",
+	"gpio2_3p3",
+};
+
+/*
+ * List of groups. Need to match the order in cygnus_pin_group_names
+ */
+static const struct cygnus_pin_group cygnus_pin_groups[] = {
+	CYGNUS_PIN_GROUP(gpio0, 0x0, 0),
+	CYGNUS_PIN_GROUP(gpio1, 0x0, 4),
+	CYGNUS_PIN_GROUP(gpio2, 0x0, 8),
+	CYGNUS_PIN_GROUP(gpio3, 0x0, 12),
+	CYGNUS_PIN_GROUP(gpio4, 0x0, 16),
+	CYGNUS_PIN_GROUP(gpio5, 0x0, 20),
+	CYGNUS_PIN_GROUP(gpio6, 0x0, 24),
+	CYGNUS_PIN_GROUP(gpio7, 0x0, 28),
+	CYGNUS_PIN_GROUP(gpio8, 0x4, 0),
+	CYGNUS_PIN_GROUP(gpio9, 0x4, 4),
+	CYGNUS_PIN_GROUP(gpio10, 0x4, 8),
+	CYGNUS_PIN_GROUP(gpio11, 0x4, 12),
+	CYGNUS_PIN_GROUP(gpio12, 0x4, 16),
+	CYGNUS_PIN_GROUP(gpio13, 0x4, 20),
+	CYGNUS_PIN_GROUP(gpio14, 0x4, 24),
+	CYGNUS_PIN_GROUP(gpio15, 0x4, 28),
+	CYGNUS_PIN_GROUP(gpio16, 0x8, 0),
+	CYGNUS_PIN_GROUP(gpio17, 0x8, 4),
+	CYGNUS_PIN_GROUP(gpio18, 0x8, 8),
+	CYGNUS_PIN_GROUP(gpio19, 0x8, 12),
+	CYGNUS_PIN_GROUP(gpio20, 0x8, 16),
+	CYGNUS_PIN_GROUP(gpio21, 0x8, 20),
+	CYGNUS_PIN_GROUP(gpio22, 0x8, 24),
+	CYGNUS_PIN_GROUP(gpio23, 0x8, 28),
+	CYGNUS_PIN_GROUP(pwm0, 0xc, 0),
+	CYGNUS_PIN_GROUP(pwm1, 0xc, 4),
+	CYGNUS_PIN_GROUP(pwm2, 0xc, 8),
+	CYGNUS_PIN_GROUP(pwm3, 0xc, 12),
+	CYGNUS_PIN_GROUP(sdio0, 0xc, 16),
+	CYGNUS_PIN_GROUP(smart_card0, 0xc, 20),
+	CYGNUS_PIN_GROUP(smart_card1, 0xc, 24),
+	CYGNUS_PIN_GROUP(spi0, 0x10, 0),
+	CYGNUS_PIN_GROUP(spi1, 0x10, 4),
+	CYGNUS_PIN_GROUP(spi2, 0x10, 8),
+	CYGNUS_PIN_GROUP(spi3, 0x10, 12),
+	CYGNUS_PIN_GROUP(d1w, 0x10, 16),
+	CYGNUS_PIN_GROUP(lcd, 0x10, 20),
+	CYGNUS_PIN_GROUP(uart0, 0x14, 0),
+	CYGNUS_PIN_GROUP(uart1_dte, 0x14, 4),
+	CYGNUS_PIN_GROUP(uart1, 0x14, 8),
+	CYGNUS_PIN_GROUP(uart3, 0x14, 12),
+	CYGNUS_PIN_GROUP(qspi, 0x14, 16),
+	CYGNUS_PIN_GROUP(nand, 0x14, 20),
+	CYGNUS_PIN_GROUP(sdio0_cd, 0x18, 0),
+	CYGNUS_PIN_GROUP(sdio0_mmc, 0x18, 4),
+	CYGNUS_PIN_GROUP(can0_spi4, 0x18, 8),
+	CYGNUS_PIN_GROUP(can1_spi4, 0x18, 12),
+	CYGNUS_PIN_GROUP(sdio1_cd, 0x18, 16),
+	CYGNUS_PIN_GROUP(sdio1_led, 0x18, 20),
+	CYGNUS_PIN_GROUP(sdio1_mmc, 0x18, 24),
+	CYGNUS_PIN_GROUP(camera_led, 0x1c, 0),
+	CYGNUS_PIN_GROUP(camera_rgmii, 0x1c, 4),
+	CYGNUS_PIN_GROUP(camera_sram_rgmii, 0x1c, 8),
+	CYGNUS_PIN_GROUP(qspi_gpio, 0x1c, 12),
+	CYGNUS_PIN_GROUP(smart_card0_fcb, 0x20, 0),
+	CYGNUS_PIN_GROUP(smart_card1_fcb, 0x20, 4),
+	CYGNUS_PIN_GROUP(gpio0_3p3, 0x28, 0),
+	CYGNUS_PIN_GROUP(gpio1_3p3, 0x28, 4),
+	CYGNUS_PIN_GROUP(gpio2_3p3, 0x28, 8),
+};
+
+#define CYGNUS_PIN_FUNCTION(fcn_name, mux_val)			\
+{								\
+	.name = #fcn_name,					\
+	.group_names = cygnus_pin_group_names,			\
+	.num_groups = ARRAY_SIZE(cygnus_pin_group_names),	\
+	.mux = mux_val,						\
+}
+
+/*
+ * Cygnus has 4 alternate functions. All groups can be configured to any of
+ * the 4 alternate functions
+ */
+static const struct cygnus_pin_function cygnus_pin_functions[] = {
+	CYGNUS_PIN_FUNCTION(alt1, 0),
+	CYGNUS_PIN_FUNCTION(alt2, 1),
+	CYGNUS_PIN_FUNCTION(alt3, 2),
+	CYGNUS_PIN_FUNCTION(alt4, 3),
+};
+
+static int cygnus_get_groups_count(struct pinctrl_dev *pctrl_dev)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->num_groups;
+}
+
+static const char *cygnus_get_group_name(struct pinctrl_dev *pctrl_dev,
+		unsigned selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->groups[selector].name;
+}
+
+static int cygnus_get_group_pins(struct pinctrl_dev *pctrl_dev,
+		unsigned selector, const unsigned **pins,
+		unsigned *num_pins)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	*pins = pinctrl->groups[selector].pins;
+	*num_pins = pinctrl->groups[selector].num_pins;
+
+	return 0;
+}
+
+static void cygnus_pin_dbg_show(struct pinctrl_dev *pctrl_dev,
+		struct seq_file *s, unsigned offset)
+{
+	seq_printf(s, " %s", dev_name(pctrl_dev->dev));
+}
+
+static int find_matched_function(const char *function_name)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(cygnus_pin_functions); i++) {
+		if (!strcmp(cygnus_pin_functions[i].name, function_name))
+			return (int)cygnus_pin_functions[i].mux;
+	}
+
+	return -EINVAL;
+}
+
+static int cygnus_dt_node_to_map(struct pinctrl_dev *pctrl_dev,
+		struct device_node *np, struct pinctrl_map **map,
+		unsigned *num_maps)
+{
+	int ret, num_groups;
+	unsigned reserved_maps = 0;
+	struct property *prop;
+	const char *group_name, *function_name;
+
+	*map = NULL;
+	*num_maps = 0;
+
+	num_groups = of_property_count_strings(np, "brcm,groups");
+	if (num_groups < 0) {
+		dev_err(pctrl_dev->dev,
+			"could not parse property brcm,groups\n");
+		return -EINVAL;
+	}
+
+	ret = of_property_read_string(np, "brcm,function", &function_name);
+	if (ret < 0) {
+		dev_err(pctrl_dev->dev,
+			"could not parse property brcm,function\n");
+		return -EINVAL;
+	}
+
+	/* make sure it's a valid alternate function */
+	ret = find_matched_function(function_name);
+	if (ret < 0) {
+		dev_err(pctrl_dev->dev, "invalid function name: %s\n",
+				function_name);
+	}
+
+	ret = pinctrl_utils_reserve_map(pctrl_dev, map, &reserved_maps,
+			num_maps, num_groups);
+	if (ret) {
+		dev_err(pctrl_dev->dev, "unable to reserve map\n");
+		return ret;
+	}
+
+	of_property_for_each_string(np, "brcm,groups", prop, group_name) {
+		ret = pinctrl_utils_add_map_mux(pctrl_dev, map,
+				&reserved_maps, num_maps, group_name,
+				function_name);
+		if (ret) {
+			dev_err(pctrl_dev->dev, "can't add map: %d\n", ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static struct pinctrl_ops cygnus_pinctrl_ops = {
+	.get_groups_count = cygnus_get_groups_count,
+	.get_group_name = cygnus_get_group_name,
+	.get_group_pins = cygnus_get_group_pins,
+	.pin_dbg_show = cygnus_pin_dbg_show,
+	.dt_node_to_map = cygnus_dt_node_to_map,
+	.dt_free_map = pinctrl_utils_dt_free_map,
+};
+
+static int cygnus_get_functions_count(struct pinctrl_dev *pctrl_dev)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->num_functions;
+}
+
+static const char *cygnus_get_function_name(struct pinctrl_dev *pctrl_dev,
+		unsigned selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->functions[selector].name;
+}
+
+static int cygnus_get_function_groups(struct pinctrl_dev *pctrl_dev,
+	unsigned selector, const char * const **groups,
+	unsigned * const num_groups)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	*groups = pinctrl->functions[selector].group_names;
+	*num_groups = pinctrl->functions[selector].num_groups;
+
+	return 0;
+}
+
+static int cygnus_pinmux_set_mux(struct pinctrl_dev *pctrl_dev,
+		unsigned function_selector, unsigned group_selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+	const struct cygnus_pin_function *function =
+			&pinctrl->functions[function_selector];
+	const struct cygnus_pin_group *group =
+			&pinctrl->groups[group_selector];
+	u32 val, mask = 0x7;
+
+	dev_dbg(pctrl_dev->dev,
+	"group:%s with offset:0x%08x shift:%u set to function: %s mux:%u\n",
+		group->name, group->offset, group->shift, function->name,
+		function->mux);
+
+	val = readl(pinctrl->base + group->offset);
+	val &= ~(mask << group->shift);
+	val |= function->mux << group->shift;
+	writel(val, pinctrl->base + group->offset);
+
+	return 0;
+}
+
+static struct pinmux_ops cygnus_pinmux_ops = {
+	.get_functions_count = cygnus_get_functions_count,
+	.get_function_name = cygnus_get_function_name,
+	.get_function_groups = cygnus_get_function_groups,
+	.set_mux = cygnus_pinmux_set_mux,
+};
+
+static struct pinctrl_desc cygnus_pinctrl_desc = {
+	.pctlops = &cygnus_pinctrl_ops,
+	.pmxops = &cygnus_pinmux_ops,
+	.owner = THIS_MODULE,
+};
+
+static int cygnus_pinctrl_probe(struct platform_device *pdev)
+{
+	struct cygnus_pinctrl *pinctrl;
+	struct resource *res;
+
+	pinctrl = devm_kzalloc(&pdev->dev, sizeof(*pinctrl), GFP_KERNEL);
+	if (!pinctrl) {
+		dev_err(&pdev->dev, "unable to allocate memory\n");
+		return -ENOMEM;
+	}
+	pinctrl->dev = &pdev->dev;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "unable to get resource\n");
+		return -ENOENT;
+	}
+
+	pinctrl->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(pinctrl->base)) {
+		dev_err(&pdev->dev, "unable to map I/O space\n");
+		return PTR_ERR(pinctrl->base);
+	}
+
+	pinctrl->pins = cygnus_pinctrl_pins;
+	pinctrl->num_pins = ARRAY_SIZE(cygnus_pinctrl_pins);
+	pinctrl->groups = cygnus_pin_groups;
+	pinctrl->num_groups = ARRAY_SIZE(cygnus_pin_groups);
+	pinctrl->functions = cygnus_pin_functions;
+	pinctrl->num_functions = ARRAY_SIZE(cygnus_pin_functions);
+
+	cygnus_pinctrl_desc.name = dev_name(&pdev->dev);
+	cygnus_pinctrl_desc.pins = cygnus_pinctrl_pins;
+	cygnus_pinctrl_desc.npins = ARRAY_SIZE(cygnus_pinctrl_pins);
+
+	pinctrl->pctl = pinctrl_register(&cygnus_pinctrl_desc, &pdev->dev,
+			pinctrl);
+	if (!pinctrl->pctl) {
+		dev_err(&pdev->dev, "unable to register cygnus pinctrl\n");
+		return -EINVAL;
+	}
+
+	platform_set_drvdata(pdev, pinctrl);
+
+	return 0;
+}
+
+static int cygnus_pinctrl_remove(struct platform_device *pdev)
+{
+	struct cygnus_pinctrl *pinctrl = platform_get_drvdata(pdev);
+
+	pinctrl_unregister(pinctrl->pctl);
+	platform_set_drvdata(pdev, NULL);
+
+	return 0;
+}
+
+static struct of_device_id cygnus_pinctrl_of_match[] = {
+	{ .compatible = "brcm,cygnus-pinctrl", },
+	{ },
+};
+
+static struct platform_driver cygnus_pinctrl_driver = {
+	.driver = {
+		.name = "cygnus-pinctrl",
+		.owner = THIS_MODULE,
+		.of_match_table = cygnus_pinctrl_of_match,
+	},
+	.probe = cygnus_pinctrl_probe,
+	.remove = cygnus_pinctrl_remove,
+};
+
+static int __init cygnus_pinctrl_init(void)
+{
+	return platform_driver_register(&cygnus_pinctrl_driver);
+}
+arch_initcall(cygnus_pinctrl_init);
+
+static void __exit cygnus_pinctrl_exit(void)
+{
+	platform_driver_unregister(&cygnus_pinctrl_driver);
+}
+module_exit(cygnus_pinctrl_exit);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus pinctrl driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH 3/4] ARM: mach-bcm: enable pinctrl support for Cygnus

[Ray Jui]

This enables the pinctrl driver for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 arch/arm/mach-bcm/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index aaeec78..b4efff2 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -29,6 +29,7 @@ config ARCH_BCM_IPROC
 config ARCH_BCM_CYGNUS
 	bool "Broadcom Cygnus Support" if ARCH_MULTI_V7
 	select ARCH_BCM_IPROC
+	select PINCTRL_BCM_CYGNUS
 	help
 	  Enable support for the Cygnus family,
 	  which includes the following variants:
-- 
1.7.9.5

[PATCH 3/4] ARM: mach-bcm: enable pinctrl support for Cygnus

[Ray Jui]

This enables the pinctrl driver for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 arch/arm/mach-bcm/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index aaeec78..b4efff2 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -29,6 +29,7 @@ config ARCH_BCM_IPROC
 config ARCH_BCM_CYGNUS
 	bool "Broadcom Cygnus Support" if ARCH_MULTI_V7
 	select ARCH_BCM_IPROC
+	select PINCTRL_BCM_CYGNUS
 	help
 	  Enable support for the Cygnus family,
 	  which includes the following variants:
-- 
1.7.9.5

[PATCH 3/4] ARM: mach-bcm: enable pinctrl support for Cygnus

[Ray Jui]

This enables the pinctrl driver for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 arch/arm/mach-bcm/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index aaeec78..b4efff2 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -29,6 +29,7 @@ config ARCH_BCM_IPROC
 config ARCH_BCM_CYGNUS
 	bool "Broadcom Cygnus Support" if ARCH_MULTI_V7
 	select ARCH_BCM_IPROC
+	select PINCTRL_BCM_CYGNUS
 	help
 	  Enable support for the Cygnus family,
 	  which includes the following variants:
-- 
1.7.9.5

[PATCH 4/4] ARM: dts: enable pinctrl for Broadcom Cygnus

[Ray Jui]

This enables the pinctrl support for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..4c6bf4d 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -54,6 +54,11 @@
 
 	/include/ "bcm-cygnus-clock.dtsi"
 
+	pinctrl: pinctrl@0x0301d0c8 {
+		compatible = "brcm,cygnus-pinctrl";
+		reg = <0x0301d0c8 0x2c>;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

[PATCH 4/4] ARM: dts: enable pinctrl for Broadcom Cygnus

[Ray Jui]

This enables the pinctrl support for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..4c6bf4d 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -54,6 +54,11 @@
 
 	/include/ "bcm-cygnus-clock.dtsi"
 
+	pinctrl: pinctrl@0x0301d0c8 {
+		compatible = "brcm,cygnus-pinctrl";
+		reg = <0x0301d0c8 0x2c>;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

[PATCH 4/4] ARM: dts: enable pinctrl for Broadcom Cygnus

[Ray Jui]

This enables the pinctrl support for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..4c6bf4d 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -54,6 +54,11 @@
 
 	/include/ "bcm-cygnus-clock.dtsi"
 
+	pinctrl: pinctrl at 0x0301d0c8 {
+		compatible = "brcm,cygnus-pinctrl";
+		reg = <0x0301d0c8 0x2c>;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

[PATCH 0/4] Add common clock support for Broadcom iProc architecture

[Ray Jui]

This patchset contains the initial common clock support for Broadcom's iProc
family of SoCs. The iProc clock architecture comprises of various PLLs, e.g.,
ARMPLL, GENPLL, LCPLL0, MIPIPLL, and etc. An onboard crystal serves as the
basic reference clock for these PLLs. Each PLL may have several leaf clocks.
One special group of clocks is the ASIU clocks, which are dervied directly
from the crystal reference clock.

This patchset also contains the basic clock support for the Broadcom Cygnus
SoC, which implements the iProc clock architecture

Ray Jui (4):
  clk: iproc: define Broadcom iProc clock binding
  clk: iproc: add initial common clock support
  clk: cygnus: add clock support for Broadcom Cygnus
  ARM: dts: enable clock support for Broadcom Cygnus

 arch/arm/boot/dts/bcm-cygnus-clock.dtsi |  110 +++++--
 arch/arm/boot/dts/bcm-cygnus.dtsi       |    2 +-
 brcm,iproc-clocks.txt                   |  178 ++++++++++++
 drivers/clk/Makefile                    |    2 +-
 drivers/clk/bcm/Kconfig                 |    9 +
 drivers/clk/bcm/Makefile                |    2 +
 drivers/clk/bcm/clk-cygnus.c            |  277 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-armpll.c      |  286 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-asiu.c        |  275 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-clk.c         |  238 +++++++++++++++
 drivers/clk/bcm/clk-iproc-pll.c         |  483 +++++++++++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc.h             |  155 ++++++++++
 include/dt-bindings/clock/bcm-cygnus.h  |   77 +++++
 13 files changed, 2067 insertions(+), 27 deletions(-)
 create mode 100644 brcm,iproc-clocks.txt
 create mode 100644 drivers/clk/bcm/clk-cygnus.c
 create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
 create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
 create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
 create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
 create mode 100644 drivers/clk/bcm/clk-iproc.h
 create mode 100644 include/dt-bindings/clock/bcm-cygnus.h

-- 
1.7.9.5

[PATCH 0/4] Add common clock support for Broadcom iProc architecture

[Ray Jui]

This patchset contains the initial common clock support for Broadcom's iProc
family of SoCs. The iProc clock architecture comprises of various PLLs, e.g.,
ARMPLL, GENPLL, LCPLL0, MIPIPLL, and etc. An onboard crystal serves as the
basic reference clock for these PLLs. Each PLL may have several leaf clocks.
One special group of clocks is the ASIU clocks, which are dervied directly
from the crystal reference clock.

This patchset also contains the basic clock support for the Broadcom Cygnus
SoC, which implements the iProc clock architecture

Ray Jui (4):
  clk: iproc: define Broadcom iProc clock binding
  clk: iproc: add initial common clock support
  clk: cygnus: add clock support for Broadcom Cygnus
  ARM: dts: enable clock support for Broadcom Cygnus

 arch/arm/boot/dts/bcm-cygnus-clock.dtsi |  110 +++++--
 arch/arm/boot/dts/bcm-cygnus.dtsi       |    2 +-
 brcm,iproc-clocks.txt                   |  178 ++++++++++++
 drivers/clk/Makefile                    |    2 +-
 drivers/clk/bcm/Kconfig                 |    9 +
 drivers/clk/bcm/Makefile                |    2 +
 drivers/clk/bcm/clk-cygnus.c            |  277 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-armpll.c      |  286 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-asiu.c        |  275 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-clk.c         |  238 +++++++++++++++
 drivers/clk/bcm/clk-iproc-pll.c         |  483 +++++++++++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc.h             |  155 ++++++++++
 include/dt-bindings/clock/bcm-cygnus.h  |   77 +++++
 13 files changed, 2067 insertions(+), 27 deletions(-)
 create mode 100644 brcm,iproc-clocks.txt
 create mode 100644 drivers/clk/bcm/clk-cygnus.c
 create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
 create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
 create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
 create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
 create mode 100644 drivers/clk/bcm/clk-iproc.h
 create mode 100644 include/dt-bindings/clock/bcm-cygnus.h

-- 
1.7.9.5

[PATCH 1/4] clk: iproc: define Broadcom iProc clock binding

[Ray Jui]

Document the device tree binding for Broadcom iProc architecture based
clock controller

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 brcm,iproc-clocks.txt |  178 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 178 insertions(+)
 create mode 100644 brcm,iproc-clocks.txt

diff --git a/brcm,iproc-clocks.txt b/brcm,iproc-clocks.txt
new file mode 100644
index 0000000..cc64fd2
--- /dev/null
+++ b/brcm,iproc-clocks.txt
@@ -0,0 +1,178 @@
+Broadcom iProc Family Clocks
+
+This binding uses the common clock binding:
+    Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+The iProc clock controller manages clocks that are common to the iProc family.
+An SoC from the iProc family may have several PPLs, e.g., ARMPLL, GENPLL,
+LCPLL0, MIPIPLL, and etc., all derived from an onboard crystal. Each PLL
+comprises of several leaf clocks
+
+Required properties for PLLs:
+- compatible:
+    Should have a value of the form "brcm,<soc>-<pll>". For example, GENPLL on
+Cygnus has a compatible string of "brcm,cygnus-genpll"
+
+- #clock-cells:
+    Must be <0>
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL
+
+- clocks:
+    The input parent clock phandle for the PLL. For all iProc PLLs, this is an
+onboard crystal with a fixed rate
+
+Optional Properties for PLLs:
+- clock-frequency:
+    PLL frequency in Hz. If specified, PLL will be configured to run at
+<clock-frequency> instead of the default frequency after chip reset, provided
+that <clock-frequency> and its parameters are defined in the SoC specific
+frequency parameter table
+
+Example:
+
+	osc: oscillator {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <25000000>;
+	};
+
+	genpll: genpll {
+		#clock-cells = <0>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
+	};
+
+Required properties for leaf clocks of a PLL:
+
+- compatible:
+    Should have a value of the form "brcm,<soc>-<pll>-clk". For example, leaf
+clocks derived from the GENPLL on Cygnus SoC have a compatible string of
+"brcm,cygnus-genpll-clk"
+
+- #clock-cells:
+    Have a value of <1> since there are more than 1 leaf clock of a
+given PLL
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL leaf clocks
+
+- clocks:
+    The input parent PLL phandle for the leaf clock
+
+- clock-output-names:
+    An ordered list of strings defining the names of the leaf clocks
+
+Example:
+
+	genpll: genpll {
+		#clock-cells = <0>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
+	};
+
+	genpll_clks: genpll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-genpll-clk";
+		reg = <0x0301d000 0x2c>;
+		clocks = <&genpll>;
+		clock-output-names = "axi21", "250mhz", "ihost_sys",
+			"enet_sw", "audio_125", "can";
+	};
+
+Required properties for ASIU clocks:
+
+ASIU clocks are a special case. These clocks are derived directly from the
+reference clock of the onboard crystal
+
+- compatible:
+    Should have a value of the form "brcm,<soc>-asiu-clk". For example, ASIU
+clocks for Cygnus have a compatible string of "brcm,cygnus-asiu-clk"
+
+- #clock-cells:
+    Have a value of <1> since there are more than 1 ASIU clocks
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for ASIU clocks
+
+- clocks:
+    The input parent clock phandle for the ASIU clock, i.e., the onboard
+crystal
+
+- clock-output-names:
+    An ordered list of strings defining the names of the ASIU clocks
+
+Example:
+
+	osc: oscillator {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <25000000>;
+	};
+
+	asiu_clks: asiu_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-asiu-clk";
+		reg = <0x0301d048 0xc>,
+			<0x180aa024 0x4>;
+		clocks = <&osc>;
+		clock-output-names = "keypad", "adc/touch", "pwm";
+	};
+
+Cygnus
+------
+PLL and leaf clock compatible strings for Cygnus are:
+    "brcm,cygnus-armpll"
+    "brcm,cygnus-genpll"
+    "brcm,cygnus-lcpll0"
+    "brcm,cygnus-mipipll"
+    "brcm,cygnus-genpll-clk"
+    "brcm,cygnus-lcpll0-clk"
+    "brcm,cygnus-mipipll-clk"
+    "brcm,cygnus-asiu-clk"
+
+The following table defines the set of PLL/clock index and ID for Cygnus.
+These clock IDs are defined in:
+    "include/dt-bindings/clock/bcm-cygnus.h"
+
+    Clock      Source           Index   ID
+    ---        -----            -----   ---------
+    crystal    N/A              N/A     N/A
+
+    armpll     crystal          N/A     N/A
+    genpll     crystal          N/A     N/A
+    lcpll0     crystal          N/A     N/A
+    mipipll    crystal          N/A     N/A
+
+    keypad     crystal (ASIU)   0       BCM_CYGNUS_ASIU_KEYPAD_CLK
+    adc/tsc    crystal (ASIU)   1       BCM_CYGNUS_ASIU_ADC_CLK
+    pwm        crystal (ASIU)   2       BCM_CYGNUS_ASIU_PWM_CLK
+
+    axi21      genpll           0       BCM_CYGNUS_GENPLL_AXI21_CLK
+    250mhz     genpll           1       BCM_CYGNUS_GENPLL_250MHZ_CLK
+    ihost_sys  genpll           2       BCM_CYGNUS_GENPLL_IHOST_SYS_CLK
+    enet_sw    genpll           3       BCM_CYGNUS_GENPLL_ENET_SW_CLK
+    audio_125  genpll           4       BCM_CYGNUS_GENPLL_AUDIO_125_CLK
+    can        genpll           5       BCM_CYGNUS_GENPLL_CAN_CLK
+
+    pcie_phy   lcpll0           0       BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK
+    ddr_phy    lcpll0           1       BCM_CYGNUS_LCPLL0_DDR_PHY_CLK
+    sdio       lcpll0           2       BCM_CYGNUS_LCPLL0_SDIO_CLK
+    usb_phy    lcpll0           3       BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK
+    smart_card lcpll0           4       BCM_CYGNUS_LCPLL0_SMART_CARD_CLK
+    ch5        lcpll0           5       BCM_CYGNUS_LCPLL0_CH5_UNUSED
+
+    ch0_unused mipipll          0       BCM_CYGNUS_MIPIPLL_CH0_UNUSED
+    ch1_lcd    mipipll          1       BCM_CYGNUS_MIPIPLL_CH1_LCD
+    ch2_unused mipipll          2       BCM_CYGNUS_MIPIPLL_CH2_UNUSED
+    ch3_unused mipipll          3       BCM_CYGNUS_MIPIPLL_CH3_UNUSED
+    ch4_unused mipipll          4       BCM_CYGNUS_MIPIPLL_CH4_UNUSED
+    ch5_unused mipipll          5       BCM_CYGNUS_MIPIPLL_CH5_UNUSED
-- 
1.7.9.5

[PATCH 1/4] clk: iproc: define Broadcom iProc clock binding

[Ray Jui]

Document the device tree binding for Broadcom iProc architecture based
clock controller

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 brcm,iproc-clocks.txt |  178 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 178 insertions(+)
 create mode 100644 brcm,iproc-clocks.txt

diff --git a/brcm,iproc-clocks.txt b/brcm,iproc-clocks.txt
new file mode 100644
index 0000000..cc64fd2
--- /dev/null
+++ b/brcm,iproc-clocks.txt
@@ -0,0 +1,178 @@
+Broadcom iProc Family Clocks
+
+This binding uses the common clock binding:
+    Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+The iProc clock controller manages clocks that are common to the iProc family.
+An SoC from the iProc family may have several PPLs, e.g., ARMPLL, GENPLL,
+LCPLL0, MIPIPLL, and etc., all derived from an onboard crystal. Each PLL
+comprises of several leaf clocks
+
+Required properties for PLLs:
+- compatible:
+    Should have a value of the form "brcm,<soc>-<pll>". For example, GENPLL on
+Cygnus has a compatible string of "brcm,cygnus-genpll"
+
+- #clock-cells:
+    Must be <0>
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL
+
+- clocks:
+    The input parent clock phandle for the PLL. For all iProc PLLs, this is an
+onboard crystal with a fixed rate
+
+Optional Properties for PLLs:
+- clock-frequency:
+    PLL frequency in Hz. If specified, PLL will be configured to run at
+<clock-frequency> instead of the default frequency after chip reset, provided
+that <clock-frequency> and its parameters are defined in the SoC specific
+frequency parameter table
+
+Example:
+
+	osc: oscillator {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <25000000>;
+	};
+
+	genpll: genpll {
+		#clock-cells = <0>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
+	};
+
+Required properties for leaf clocks of a PLL:
+
+- compatible:
+    Should have a value of the form "brcm,<soc>-<pll>-clk". For example, leaf
+clocks derived from the GENPLL on Cygnus SoC have a compatible string of
+"brcm,cygnus-genpll-clk"
+
+- #clock-cells:
+    Have a value of <1> since there are more than 1 leaf clock of a
+given PLL
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL leaf clocks
+
+- clocks:
+    The input parent PLL phandle for the leaf clock
+
+- clock-output-names:
+    An ordered list of strings defining the names of the leaf clocks
+
+Example:
+
+	genpll: genpll {
+		#clock-cells = <0>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
+	};
+
+	genpll_clks: genpll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-genpll-clk";
+		reg = <0x0301d000 0x2c>;
+		clocks = <&genpll>;
+		clock-output-names = "axi21", "250mhz", "ihost_sys",
+			"enet_sw", "audio_125", "can";
+	};
+
+Required properties for ASIU clocks:
+
+ASIU clocks are a special case. These clocks are derived directly from the
+reference clock of the onboard crystal
+
+- compatible:
+    Should have a value of the form "brcm,<soc>-asiu-clk". For example, ASIU
+clocks for Cygnus have a compatible string of "brcm,cygnus-asiu-clk"
+
+- #clock-cells:
+    Have a value of <1> since there are more than 1 ASIU clocks
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for ASIU clocks
+
+- clocks:
+    The input parent clock phandle for the ASIU clock, i.e., the onboard
+crystal
+
+- clock-output-names:
+    An ordered list of strings defining the names of the ASIU clocks
+
+Example:
+
+	osc: oscillator {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <25000000>;
+	};
+
+	asiu_clks: asiu_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-asiu-clk";
+		reg = <0x0301d048 0xc>,
+			<0x180aa024 0x4>;
+		clocks = <&osc>;
+		clock-output-names = "keypad", "adc/touch", "pwm";
+	};
+
+Cygnus
+------
+PLL and leaf clock compatible strings for Cygnus are:
+    "brcm,cygnus-armpll"
+    "brcm,cygnus-genpll"
+    "brcm,cygnus-lcpll0"
+    "brcm,cygnus-mipipll"
+    "brcm,cygnus-genpll-clk"
+    "brcm,cygnus-lcpll0-clk"
+    "brcm,cygnus-mipipll-clk"
+    "brcm,cygnus-asiu-clk"
+
+The following table defines the set of PLL/clock index and ID for Cygnus.
+These clock IDs are defined in:
+    "include/dt-bindings/clock/bcm-cygnus.h"
+
+    Clock      Source           Index   ID
+    ---        -----            -----   ---------
+    crystal    N/A              N/A     N/A
+
+    armpll     crystal          N/A     N/A
+    genpll     crystal          N/A     N/A
+    lcpll0     crystal          N/A     N/A
+    mipipll    crystal          N/A     N/A
+
+    keypad     crystal (ASIU)   0       BCM_CYGNUS_ASIU_KEYPAD_CLK
+    adc/tsc    crystal (ASIU)   1       BCM_CYGNUS_ASIU_ADC_CLK
+    pwm        crystal (ASIU)   2       BCM_CYGNUS_ASIU_PWM_CLK
+
+    axi21      genpll           0       BCM_CYGNUS_GENPLL_AXI21_CLK
+    250mhz     genpll           1       BCM_CYGNUS_GENPLL_250MHZ_CLK
+    ihost_sys  genpll           2       BCM_CYGNUS_GENPLL_IHOST_SYS_CLK
+    enet_sw    genpll           3       BCM_CYGNUS_GENPLL_ENET_SW_CLK
+    audio_125  genpll           4       BCM_CYGNUS_GENPLL_AUDIO_125_CLK
+    can        genpll           5       BCM_CYGNUS_GENPLL_CAN_CLK
+
+    pcie_phy   lcpll0           0       BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK
+    ddr_phy    lcpll0           1       BCM_CYGNUS_LCPLL0_DDR_PHY_CLK
+    sdio       lcpll0           2       BCM_CYGNUS_LCPLL0_SDIO_CLK
+    usb_phy    lcpll0           3       BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK
+    smart_card lcpll0           4       BCM_CYGNUS_LCPLL0_SMART_CARD_CLK
+    ch5        lcpll0           5       BCM_CYGNUS_LCPLL0_CH5_UNUSED
+
+    ch0_unused mipipll          0       BCM_CYGNUS_MIPIPLL_CH0_UNUSED
+    ch1_lcd    mipipll          1       BCM_CYGNUS_MIPIPLL_CH1_LCD
+    ch2_unused mipipll          2       BCM_CYGNUS_MIPIPLL_CH2_UNUSED
+    ch3_unused mipipll          3       BCM_CYGNUS_MIPIPLL_CH3_UNUSED
+    ch4_unused mipipll          4       BCM_CYGNUS_MIPIPLL_CH4_UNUSED
+    ch5_unused mipipll          5       BCM_CYGNUS_MIPIPLL_CH5_UNUSED
-- 
1.7.9.5

[PATCH 2/4] clk: iproc: add initial common clock support

[Ray Jui]

This adds basic and generic support for various iProc PLLs and clocks
including the ARMPLL, GENPLL, LCPLL, MIPIPLL, and ASIU clocks.

SoCs under the iProc architecture can define their specific register
offsets and clock parameters for their PLL and clock controllers. These
parameters can be passed as arugments into the generic iProc PLL and
clock setup functions

Derived from code originally provided by Jonathan Richardson
<jonathar@broadcom.com>

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/clk/Makefile               |    2 +-
 drivers/clk/bcm/Kconfig            |    9 +
 drivers/clk/bcm/Makefile           |    1 +
 drivers/clk/bcm/clk-iproc-armpll.c |  286 +++++++++++++++++++++
 drivers/clk/bcm/clk-iproc-asiu.c   |  275 ++++++++++++++++++++
 drivers/clk/bcm/clk-iproc-clk.c    |  238 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-pll.c    |  483 ++++++++++++++++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc.h        |  155 ++++++++++++
 8 files changed, 1448 insertions(+), 1 deletion(-)
 create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
 create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
 create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
 create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
 create mode 100644 drivers/clk/bcm/clk-iproc.h

diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index d5fba5b..eff0213 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -41,7 +41,7 @@ obj-$(CONFIG_ARCH_VT8500)		+= clk-vt8500.o
 obj-$(CONFIG_COMMON_CLK_WM831X)		+= clk-wm831x.o
 obj-$(CONFIG_COMMON_CLK_XGENE)		+= clk-xgene.o
 obj-$(CONFIG_COMMON_CLK_AT91)		+= at91/
-obj-$(CONFIG_ARCH_BCM_MOBILE)		+= bcm/
+obj-$(CONFIG_ARCH_BCM)			+= bcm/
 obj-$(CONFIG_ARCH_BERLIN)		+= berlin/
 obj-$(CONFIG_ARCH_HI3xxx)		+= hisilicon/
 obj-$(CONFIG_ARCH_HIP04)		+= hisilicon/
diff --git a/drivers/clk/bcm/Kconfig b/drivers/clk/bcm/Kconfig
index 75506e5..66b5b7f 100644
--- a/drivers/clk/bcm/Kconfig
+++ b/drivers/clk/bcm/Kconfig
@@ -7,3 +7,12 @@ config CLK_BCM_KONA
 	  Enable common clock framework support for Broadcom SoCs
 	  using "Kona" style clock control units, including those
 	  in the BCM281xx and BCM21664 families.
+
+config COMMON_CLK_IPROC
+	bool "Broadcom iProc clock support"
+	depends on ARCH_BCM_IPROC
+	depends on COMMON_CLK
+	default y
+	help
+	  Enable common clock framework support for Broadcom SoCs
+	  based on the "iProc" architecture
diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
index 6297d05..6926636 100644
--- a/drivers/clk/bcm/Makefile
+++ b/drivers/clk/bcm/Makefile
@@ -2,3 +2,4 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
+obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
diff --git a/drivers/clk/bcm/clk-iproc-armpll.c b/drivers/clk/bcm/clk-iproc-armpll.c
new file mode 100644
index 0000000..ec9b130
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-armpll.c
@@ -0,0 +1,286 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+
+#define IPROC_CLK_MAX_FREQ_POLICY                    0x3
+#define IPROC_CLK_POLICY_FREQ_OFFSET                 0x008
+#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT      8
+#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK       0x7
+
+#define IPROC_CLK_PLLARMA_OFFSET                     0xc00
+#define IPROC_CLK_PLLARMA_LOCK_SHIFT                 28
+#define IPROC_CLK_PLLARMA_PDIV_SHIFT                 24
+#define IPROC_CLK_PLLARMA_PDIV_MASK                  0xf
+#define IPROC_CLK_PLLARMA_NDIV_INT_SHIFT             8
+#define IPROC_CLK_PLLARMA_NDIV_INT_MASK              0x3ff
+
+#define IPROC_CLK_PLLARMB_OFFSET                     0xc04
+#define IPROC_CLK_PLLARMB_NDIV_FRAC_MASK             0xfffff
+
+#define IPROC_CLK_PLLARMC_OFFSET                     0xc08
+#define IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT            8
+#define IPROC_CLK_PLLARMC_MDIV_MASK                  0xff
+
+#define IPROC_CLK_PLLARMCTL5_OFFSET                  0xc20
+#define IPROC_CLK_PLLARMCTL5_H_MDIV_MASK             0xff
+
+#define IPROC_CLK_PLLARM_OFFSET_OFFSET               0xc24
+#define IPROC_CLK_PLLARM_SW_CTL_SHIFT                29
+#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT       20
+#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK        0xff
+#define IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK       0xfffff
+
+#define IPROC_CLK_ARM_DIV_OFFSET                     0xe00
+#define IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT  4
+#define IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK        0xf
+
+#define IPROC_CLK_POLICY_DBG_OFFSET                  0xec0
+#define IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT          12
+#define IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK           0x7
+
+enum iproc_arm_pll_fid {
+	ARM_PLL_FID_CRYSTAL_CLK   = 0,
+	ARM_PLL_FID_SYS_CLK       = 2,
+	ARM_PLL_FID_CH0_SLOW_CLK  = 6,
+	ARM_PLL_FID_CH1_FAST_CLK  = 7
+};
+
+struct iproc_arm_pll {
+	struct clk_hw hw;
+	void __iomem *base;
+	struct clk_onecell_data clk_data;
+	unsigned long rate;
+};
+
+#define to_iproc_arm_pll(hw) container_of(hw, struct iproc_arm_pll, hw)
+
+static unsigned int __get_fid(struct iproc_arm_pll *pll)
+{
+	u32 val;
+	unsigned int policy, fid, active_fid;
+
+	val = readl(pll->base + IPROC_CLK_ARM_DIV_OFFSET);
+	if (val & (1 << IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT))
+		policy = val & IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK;
+	else
+		policy = 0;
+
+	/* something is seriously wrong */
+	BUG_ON(policy > IPROC_CLK_MAX_FREQ_POLICY);
+
+	val = readl(pll->base + IPROC_CLK_POLICY_FREQ_OFFSET);
+	fid = (val >> (IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT * policy)) &
+		IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK;
+
+	val = readl(pll->base + IPROC_CLK_POLICY_DBG_OFFSET);
+	active_fid = IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK &
+		(val >> IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT);
+	if (fid != active_fid) {
+		pr_debug("%s: fid override %u->%u\n", __func__,	fid,
+				active_fid);
+		fid = active_fid;
+	}
+
+	pr_debug("%s: active fid: %u\n", __func__, fid);
+
+	return fid;
+}
+
+/*
+ * Determine the mdiv (post divider) based on the frequency ID being used.
+ * There are 4 sources that can be used to derive the output clock rate:
+ *    - 25 MHz Crystal
+ *    - System clock
+ *    - PLL channel 0 (slow clock)
+ *    - PLL channel 1 (fast clock)
+ */
+static int __get_mdiv(struct iproc_arm_pll *pll)
+{
+	unsigned int fid;
+	int mdiv;
+	u32 val;
+
+	fid = __get_fid(pll);
+
+	switch (fid) {
+	case ARM_PLL_FID_CRYSTAL_CLK:
+	case ARM_PLL_FID_SYS_CLK:
+		mdiv = 1;
+		break;
+
+	case ARM_PLL_FID_CH0_SLOW_CLK:
+		val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
+		mdiv = val & IPROC_CLK_PLLARMC_MDIV_MASK;
+		if (mdiv == 0)
+			mdiv = 256;
+		break;
+
+	case ARM_PLL_FID_CH1_FAST_CLK:
+		val = readl(pll->base +	IPROC_CLK_PLLARMCTL5_OFFSET);
+		mdiv = val & IPROC_CLK_PLLARMCTL5_H_MDIV_MASK;
+		if (mdiv == 0)
+			mdiv = 256;
+		break;
+
+	default:
+		mdiv = -EFAULT;
+	}
+
+	return mdiv;
+}
+
+static unsigned int __get_ndiv(struct iproc_arm_pll *pll)
+{
+	u32 val;
+	unsigned int ndiv_int, ndiv_frac, ndiv;
+
+	val = readl(pll->base + IPROC_CLK_PLLARM_OFFSET_OFFSET);
+	if (val & (1 << IPROC_CLK_PLLARM_SW_CTL_SHIFT)) {
+		/*
+		 * offset mode is active. Read the ndiv from the PLLARM OFFSET
+		 * register
+		 */
+		ndiv_int = (val >> IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT) &
+			IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK;
+		if (ndiv_int == 0)
+			ndiv_int = 256;
+
+		ndiv_frac = val & IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK;
+	} else {
+		/* offset mode not active */
+		val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
+		ndiv_int = (val >> IPROC_CLK_PLLARMA_NDIV_INT_SHIFT) &
+			IPROC_CLK_PLLARMA_NDIV_INT_MASK;
+		if (ndiv_int == 0)
+			ndiv_int = 1024;
+
+		val = readl(pll->base + IPROC_CLK_PLLARMB_OFFSET);
+		ndiv_frac = val & IPROC_CLK_PLLARMB_NDIV_FRAC_MASK;
+	}
+
+	ndiv = (ndiv_int << 20) | ndiv_frac;
+
+	return ndiv;
+}
+
+/*
+ * The output frequency of the ARM PLL is calculated based on the ARM PLL
+ * divider values:
+ *   pdiv = ARM PLL pre-divider
+ *   ndiv = ARM PLL multiplier
+ *   mdiv = ARM PLL post divider
+ *
+ * The frequency is calculated by:
+ *   ((ndiv * parent clock rate) / pdiv) / mdiv
+ */
+static unsigned long iproc_arm_pll_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_arm_pll *pll = to_iproc_arm_pll(hw);
+	u32 val;
+	int mdiv;
+	u64 ndiv;
+	unsigned int pdiv;
+
+	/* in bypass mode, use parent rate */
+	val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
+	if (val & (1 << IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT)) {
+		pll->rate = parent_rate;
+		return pll->rate;
+	}
+
+	/* PLL needs to be locked */
+	val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
+	if (!(val & (1 << IPROC_CLK_PLLARMA_LOCK_SHIFT))) {
+		pll->rate = 0;
+		return 0;
+	}
+
+	pdiv = (val >> IPROC_CLK_PLLARMA_PDIV_SHIFT) &
+		IPROC_CLK_PLLARMA_PDIV_MASK;
+	if (pdiv == 0)
+		pdiv = 16;
+
+	ndiv = __get_ndiv(pll);
+	mdiv = __get_mdiv(pll);
+	if (mdiv <= 0) {
+		pll->rate = 0;
+		return 0;
+	}
+	pll->rate = (ndiv * parent_rate) >> 20;
+	pll->rate = (pll->rate / pdiv) / mdiv;
+
+	pr_debug("%s: ARM PLL rate: %lu. parent rate: %lu\n", __func__,
+			pll->rate, parent_rate);
+	pr_debug("%s: ndiv_int: %u, pdiv: %u, mdiv: %d\n", __func__,
+			(unsigned int)(ndiv >> 20), pdiv, mdiv);
+
+	return pll->rate;
+}
+
+static const struct clk_ops iproc_arm_pll_ops = {
+	.recalc_rate = iproc_arm_pll_recalc_rate,
+};
+
+void __init iproc_armpll_setup(struct device_node *node)
+{
+	int ret;
+	struct clk *clk;
+	struct iproc_arm_pll *pll;
+	struct clk_init_data init;
+	const char *parent_name;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->base = of_iomap(node, 0);
+	if (WARN_ON(!pll->base))
+		goto err_free_pll;
+
+	init.name = node->name;
+	init.ops = &iproc_arm_pll_ops;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	pll->hw.init = &init;
+
+	clk = clk_register(NULL, &pll->hw);
+	if (WARN_ON(IS_ERR(clk)))
+		goto err_iounmap;
+
+	pll->clk_data.clk_num = 1;
+	pll->clk_data.clks = &clk;
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_unregister;
+
+	return;
+
+err_clk_unregister:
+	clk_unregister(clk);
+err_iounmap:
+	iounmap(pll->base);
+err_free_pll:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc-asiu.c b/drivers/clk/bcm/clk-iproc-asiu.c
new file mode 100644
index 0000000..ab86b8c
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-asiu.c
@@ -0,0 +1,275 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+struct iproc_asiu;
+
+struct iproc_asiu_clk {
+	struct clk_hw hw;
+	const char *name;
+	struct iproc_asiu *asiu;
+	unsigned long rate;
+	struct iproc_asiu_div div;
+	struct iproc_asiu_gate gate;
+};
+
+struct iproc_asiu {
+	void __iomem *div_base;
+	void __iomem *gate_base;
+
+	struct clk_onecell_data clk_data;
+	struct iproc_asiu_clk *clks;
+};
+
+#define to_asiu_clk(hw) container_of(hw, struct iproc_asiu_clk, hw)
+
+static int iproc_asiu_clk_enable(struct clk_hw *hw)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+
+	/* some clocks at the ASIU level are always enabled */
+	if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
+		return 0;
+
+	val = readl(asiu->gate_base + clk->gate.offset);
+	val |= (1 << clk->gate.en_shift);
+	writel(val, asiu->gate_base + clk->gate.offset);
+
+	return 0;
+}
+
+static void iproc_asiu_clk_disable(struct clk_hw *hw)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+
+	/* some clocks at the ASIU level are always enabled */
+	if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
+		return;
+
+	val = readl(asiu->gate_base + clk->gate.offset);
+	val &= ~(1 << clk->gate.en_shift);
+	writel(val, asiu->gate_base + clk->gate.offset);
+}
+
+static unsigned long iproc_asiu_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+	unsigned int div_h, div_l;
+
+	if (parent_rate == 0) {
+		clk->rate = 0;
+		return 0;
+	}
+
+	/* if clock divisor is not enabled, simply return parent rate */
+	val = readl(asiu->div_base + clk->div.offset);
+	if ((val & (1 << clk->div.en_shift)) == 0) {
+		clk->rate = parent_rate;
+		return parent_rate;
+	}
+
+	/* clock rate = parent rate / (high_div + 1) + (low_div + 1) */
+	div_h = (val >> clk->div.high_shift) & bit_mask(clk->div.high_width);
+	div_h++;
+	div_l = (val >> clk->div.low_shift) & bit_mask(clk->div.low_width);
+	div_l++;
+
+	clk->rate = parent_rate / (div_h + div_l);
+	pr_debug("%s: rate: %lu. parent rate: %lu div_h: %u div_l: %u\n",
+		__func__, clk->rate, parent_rate, div_h, div_l);
+
+	return clk->rate;
+}
+
+static long iproc_asiu_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	unsigned int div;
+
+	if (rate == 0 || *parent_rate == 0)
+		return -EINVAL;
+
+	if (rate == *parent_rate)
+		return *parent_rate;
+
+	div = DIV_ROUND_UP(*parent_rate, rate);
+	if (div < 2)
+		return *parent_rate;
+
+	return *parent_rate / div;
+}
+
+static int iproc_asiu_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	unsigned int div, div_h, div_l;
+	u32 val;
+
+	if (rate == 0 || parent_rate == 0)
+		return -EINVAL;
+
+	/* simply disable the divisor if one wants the same rate as parent */
+	if (rate == parent_rate) {
+		val = readl(asiu->div_base + clk->div.offset);
+		val &= ~(1 << clk->div.en_shift);
+		writel(val, asiu->div_base + clk->div.offset);
+		return 0;
+	}
+
+	div = DIV_ROUND_UP(parent_rate, rate);
+	if (div < 2)
+		return -EINVAL;
+
+	div_h = div_l = div >> 1;
+	div_h--;
+	div_l--;
+
+	val = readl(asiu->div_base + clk->div.offset);
+	val |= 1 << clk->div.en_shift;
+	if (div_h) {
+		val &= ~(bit_mask(clk->div.high_width)
+				<< clk->div.high_shift);
+		val |= div_h << clk->div.high_shift;
+	} else {
+		val &= ~(bit_mask(clk->div.high_width)
+				<< clk->div.high_shift);
+	}
+	if (div_l) {
+		val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
+		val |= div_l << clk->div.low_shift;
+	} else {
+		val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
+	}
+	writel(val, asiu->div_base + clk->div.offset);
+
+	return 0;
+}
+
+static const struct clk_ops iproc_asiu_ops = {
+	.enable = iproc_asiu_clk_enable,
+	.disable = iproc_asiu_clk_disable,
+	.recalc_rate = iproc_asiu_clk_recalc_rate,
+	.round_rate = iproc_asiu_clk_round_rate,
+	.set_rate = iproc_asiu_clk_set_rate,
+};
+
+void __init iproc_asiu_setup(struct device_node *node,
+		const struct iproc_asiu_div *div,
+		const struct iproc_asiu_gate *gate, unsigned int num_clks)
+{
+	int i, ret;
+	struct iproc_asiu *asiu;
+
+	if (WARN_ON(!gate || !div))
+		return;
+
+	asiu = kzalloc(sizeof(*asiu), GFP_KERNEL);
+	if (WARN_ON(!asiu))
+		return;
+
+	asiu->clk_data.clk_num = num_clks;
+	asiu->clk_data.clks = kcalloc(num_clks, sizeof(*asiu->clk_data.clks),
+			GFP_KERNEL);
+	if (WARN_ON(!asiu->clk_data.clks))
+		goto err_clks;
+
+	asiu->clks = kcalloc(num_clks, sizeof(*asiu->clks), GFP_KERNEL);
+	if (WARN_ON(!asiu->clks))
+		goto err_asiu_clks;
+
+	asiu->div_base = of_iomap(node, 0);
+	if (WARN_ON(!asiu->div_base))
+		goto err_iomap_div;
+
+	asiu->gate_base = of_iomap(node, 1);
+	if (WARN_ON(!asiu->gate_base))
+		goto err_iomap_gate;
+
+	for (i = 0; i < num_clks; i++) {
+		struct clk_init_data init;
+		struct clk *clk;
+		const char *parent_name;
+		struct iproc_asiu_clk *asiu_clk;
+		const char *clk_name;
+
+		clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
+		if (WARN_ON(!clk_name))
+			goto err_clk_register;
+
+		ret = of_property_read_string_index(node, "clock-output-names",
+				i, &clk_name);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+
+		asiu_clk = &asiu->clks[i];
+		asiu_clk->name = clk_name;
+		asiu_clk->asiu = asiu;
+		asiu_clk->div = div[i];
+		asiu_clk->gate = gate[i];
+		init.name = clk_name;
+		init.ops = &iproc_asiu_ops;
+		init.flags = 0;
+		parent_name = of_clk_get_parent_name(node, 0);
+		init.parent_names = (parent_name ? &parent_name : NULL);
+		init.num_parents = (parent_name ? 1 : 0);
+		asiu_clk->hw.init = &init;
+
+		clk = clk_register(NULL, &asiu_clk->hw);
+		if (WARN_ON(IS_ERR(clk)))
+			goto err_clk_register;
+		asiu->clk_data.clks[i] = clk;
+	}
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get,
+			&asiu->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_register;
+
+	return;
+
+err_clk_register:
+	for (i = 0; i < num_clks; i++)
+		kfree(asiu->clks[i].name);
+	iounmap(asiu->gate_base);
+
+err_iomap_gate:
+	iounmap(asiu->div_base);
+
+err_iomap_div:
+	kfree(asiu->clks);
+
+err_asiu_clks:
+	kfree(asiu->clk_data.clks);
+
+err_clks:
+	kfree(asiu);
+}
diff --git a/drivers/clk/bcm/clk-iproc-clk.c b/drivers/clk/bcm/clk-iproc-clk.c
new file mode 100644
index 0000000..be3c42c
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-clk.c
@@ -0,0 +1,238 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+struct iproc_pll;
+
+struct iproc_clk {
+	struct clk_hw hw;
+	const char *name;
+	struct iproc_pll *pll;
+	unsigned long rate;
+	const struct iproc_clk_ctrl *ctrl;
+};
+
+struct iproc_pll {
+	void __iomem *base;
+	struct clk_onecell_data clk_data;
+	struct iproc_clk *clks;
+};
+
+#define to_iproc_clk(hw) container_of(hw, struct iproc_clk, hw)
+
+static int iproc_clk_enable(struct clk_hw *hw)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+
+	/* channel enable is active low */
+	val = readl(pll->base + ctrl->enable.offset);
+	val &= ~(1 << ctrl->enable.enable_shift);
+	writel(val, pll->base + ctrl->enable.offset);
+
+	/* also make sure channel is not held */
+	val = readl(pll->base + ctrl->enable.offset);
+	val &= ~(1 << ctrl->enable.hold_shift);
+	writel(val, pll->base + ctrl->enable.offset);
+
+	return 0;
+}
+
+static void iproc_clk_disable(struct clk_hw *hw)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+
+	if (ctrl->flags & IPROC_CLK_AON)
+		return;
+
+	val = readl(pll->base + ctrl->enable.offset);
+	val |= 1 << ctrl->enable.enable_shift;
+	writel(val, pll->base + ctrl->enable.offset);
+}
+
+static unsigned long iproc_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+	unsigned int mdiv;
+
+	if (parent_rate == 0)
+		return 0;
+
+	val = readl(pll->base + ctrl->mdiv.offset);
+	mdiv = (val >> ctrl->mdiv.shift) & bit_mask(ctrl->mdiv.width);
+	if (mdiv == 0)
+		mdiv = 256;
+
+	clk->rate = parent_rate / mdiv;
+
+	return clk->rate;
+}
+
+static long iproc_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	unsigned int div;
+
+	if (rate == 0 || *parent_rate == 0)
+		return -EINVAL;
+
+	if (rate == *parent_rate)
+		return *parent_rate;
+
+	div = DIV_ROUND_UP(*parent_rate, rate);
+	if (div < 2)
+		return *parent_rate;
+
+	if (div > 256)
+		div = 256;
+
+	return *parent_rate / div;
+}
+
+static int iproc_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+	unsigned int div;
+
+	if (rate == 0 || parent_rate == 0)
+		return -EINVAL;
+
+	div = DIV_ROUND_UP(parent_rate, rate);
+	if (div > 256)
+		return -EINVAL;
+
+	val = readl(pll->base + ctrl->mdiv.offset);
+	if (div == 256) {
+		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
+	} else {
+		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
+		val |= div << ctrl->mdiv.shift;
+	}
+	writel(val, pll->base + ctrl->mdiv.offset);
+	clk->rate = parent_rate / div;
+
+	return 0;
+}
+
+static const struct clk_ops iproc_clk_ops = {
+	.enable = iproc_clk_enable,
+	.disable = iproc_clk_disable,
+	.recalc_rate = iproc_clk_recalc_rate,
+	.round_rate = iproc_clk_round_rate,
+	.set_rate = iproc_clk_set_rate,
+};
+
+void __init iproc_clk_setup(struct device_node *node,
+		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks)
+{
+	int i, ret;
+	struct iproc_pll *pll;
+
+	if (WARN_ON(!ctrl))
+		return;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->clk_data.clk_num = num_clks;
+	pll->clk_data.clks = kcalloc(num_clks, sizeof(*pll->clk_data.clks),
+			GFP_KERNEL);
+	if (WARN_ON(!pll->clk_data.clks))
+		goto err_clks;
+
+	pll->clks = kcalloc(num_clks, sizeof(*pll->clks), GFP_KERNEL);
+	if (WARN_ON(!pll->clks))
+		goto err_pll_clks;
+
+	pll->base = of_iomap(node, 0);
+	if (WARN_ON(!pll->base))
+		goto err_iomap;
+
+	for (i = 0; i < num_clks; i++) {
+		struct clk_init_data init;
+		struct clk *clk;
+		const char *parent_name;
+		struct iproc_clk *iclk;
+		const char *clk_name;
+
+		clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
+		if (WARN_ON(!clk_name))
+			goto err_clk_register;
+
+		ret = of_property_read_string_index(node, "clock-output-names",
+				i, &clk_name);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+
+		iclk = &pll->clks[i];
+		iclk->name = clk_name;
+		iclk->pll = pll;
+		iclk->ctrl = &ctrl[i];
+		init.name = clk_name;
+		init.ops = &iproc_clk_ops;
+		init.flags = 0;
+		parent_name = of_clk_get_parent_name(node, 0);
+		init.parent_names = (parent_name ? &parent_name : NULL);
+		init.num_parents = (parent_name ? 1 : 0);
+		iclk->hw.init = &init;
+
+		clk = clk_register(NULL, &iclk->hw);
+		if (WARN_ON(IS_ERR(clk)))
+			goto err_clk_register;
+		pll->clk_data.clks[i] = clk;
+	}
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_register;
+
+	return;
+
+err_clk_register:
+	for (i = 0; i < num_clks; i++)
+		kfree(pll->clks[i].name);
+	iounmap(pll->base);
+
+err_iomap:
+	kfree(pll->clks);
+
+err_pll_clks:
+	kfree(pll->clk_data.clks);
+
+err_clks:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc-pll.c b/drivers/clk/bcm/clk-iproc-pll.c
new file mode 100644
index 0000000..cd3bd38
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-pll.c
@@ -0,0 +1,483 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+#define PLL_VCO_HIGH_SHIFT 19
+#define PLL_VCO_LOW_SHIFT  30
+
+/* number of delay loops waiting for PLL to lock */
+#define LOCK_DELAY 100
+
+/* number of VCO frequency bands */
+#define NUM_FREQ_BANDS 8
+
+#define NUM_KP_BANDS 3
+enum kp_band {
+	KP_BAND_MID = 0,
+	KP_BAND_HIGH,
+	KP_BAND_HIGH_HIGH
+};
+
+static const unsigned int kp_table[NUM_KP_BANDS][NUM_FREQ_BANDS] = {
+	{ 5, 6, 6, 7, 7, 8, 9, 10 },
+	{ 4, 4, 5, 5, 6, 7, 8, 9  },
+	{ 4, 5, 5, 6, 7, 8, 9, 10 },
+};
+
+static const unsigned long ref_freq_table[NUM_FREQ_BANDS][2] = {
+	{ 10000000,  12500000  },
+	{ 12500000,  15000000  },
+	{ 15000000,  20000000  },
+	{ 20000000,  25000000  },
+	{ 25000000,  50000000  },
+	{ 50000000,  75000000  },
+	{ 75000000,  100000000 },
+	{ 100000000, 125000000 },
+};
+
+enum vco_freq_range {
+	VCO_LOW       = 700000000U,
+	VCO_MID       = 1200000000U,
+	VCO_HIGH      = 2200000000U,
+	VCO_HIGH_HIGH = 3100000000U,
+	VCO_MAX       = 4000000000U,
+};
+
+struct iproc_pll {
+	struct clk_hw hw;
+	void __iomem *pll_base;
+	void __iomem *pwr_base;
+	void __iomem *asiu_base;
+	struct clk_onecell_data clk_data;
+	const char *name;
+	const struct iproc_pll_ctrl *ctrl;
+	const struct iproc_pll_vco_freq_param *vco_param;
+	unsigned int num_vco_entries;
+	unsigned long rate;
+};
+
+#define to_iproc_pll(hw) container_of(hw, struct iproc_pll, hw)
+
+/*
+ * Get the clock rate based on name
+ */
+static unsigned long __get_rate(const char *clk_name)
+{
+	struct clk *clk;
+
+	clk = __clk_lookup(clk_name);
+	if (!clk) {
+		pr_err("%s: unable to find clock by name: %s\n", __func__,
+				clk_name);
+		return 0;
+	}
+
+	return clk_get_rate(clk);
+}
+
+/*
+ * Based on the target frequency, find a match from the VCO frequency parameter
+ * table and return its index
+ */
+static int pll_get_rate_index(struct iproc_pll *pll, unsigned int target_rate)
+{
+	int i;
+
+	for (i = 0; i < pll->num_vco_entries; i++)
+		if (target_rate == pll->vco_param[i].rate)
+			break;
+
+	if (i >= pll->num_vco_entries)
+		return -EINVAL;
+
+	return i;
+}
+
+static int get_kp(unsigned long ref_freq, enum kp_band kp_index)
+{
+	int i;
+
+	if (ref_freq < ref_freq_table[0][0])
+		return -EINVAL;
+
+	for (i = 0; i < NUM_FREQ_BANDS; i++) {
+		if (ref_freq >= ref_freq_table[i][0] &&
+			ref_freq < ref_freq_table[i][1])
+			return kp_table[kp_index][i];
+	}
+	return -EINVAL;
+}
+
+static int pll_wait_for_lock(struct iproc_pll *pll)
+{
+	int i;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+
+	for (i = 0; i < LOCK_DELAY; i++) {
+		u32 val = readl(pll->pll_base + ctrl->status.offset);
+
+		if (val & (1 << ctrl->status.shift))
+			return 0;
+		udelay(10);
+	}
+
+	return -EIO;
+}
+
+static void __pll_disable(struct iproc_pll *pll)
+{
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		val = readl(pll->asiu_base + ctrl->asiu.offset);
+		val &= ~(1 << ctrl->asiu.en_shift);
+		writel(val, pll->asiu_base + ctrl->asiu.offset);
+	}
+
+	/* latch input value so core power can be shut down */
+	val = readl(pll->pwr_base + ctrl->aon.offset);
+	val |= (1 << ctrl->aon.iso_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+
+	/* power down the core */
+	val &= ~(bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+}
+
+static int __pll_enable(struct iproc_pll *pll)
+{
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+
+	/* power up the PLL and make sure it's not latched */
+	val = readl(pll->pwr_base + ctrl->aon.offset);
+	val |= bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift;
+	val &= ~(1 << ctrl->aon.iso_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+
+	/* certain PLLs also need to be ungated from the ASIU top level */
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		val = readl(pll->asiu_base + ctrl->asiu.offset);
+		val |= (1 << ctrl->asiu.en_shift);
+		writel(val, pll->asiu_base + ctrl->asiu.offset);
+	}
+
+	return 0;
+}
+
+static void __pll_put_in_reset(struct iproc_pll *pll)
+{
+	u32 val;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
+
+	val = readl(pll->pll_base + reset->offset);
+	val &= ~(1 << reset->reset_shift | 1 << reset->p_reset_shift);
+	writel(val, pll->pll_base + reset->offset);
+}
+
+static void __pll_bring_out_reset(struct iproc_pll *pll, unsigned int kp,
+		unsigned int ka, unsigned int ki)
+{
+	u32 val;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
+
+	val = readl(pll->pll_base + reset->offset);
+	val &= ~(bit_mask(reset->ki_width) << reset->ki_shift |
+		bit_mask(reset->kp_width) << reset->kp_shift |
+		bit_mask(reset->ka_width) << reset->ka_shift);
+	val |=  ki << reset->ki_shift | kp << reset->kp_shift |
+		ka << reset->ka_shift;
+	val |= 1 << reset->reset_shift | 1 << reset->p_reset_shift;
+	writel(val, pll->pll_base + reset->offset);
+}
+
+static int pll_set_rate(struct iproc_pll *pll, unsigned int rate_index,
+		unsigned long parent_rate)
+{
+	const struct iproc_pll_vco_freq_param *vco =
+				&pll->vco_param[rate_index];
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	int ka = 0, ki, kp, ret;
+	unsigned long rate = vco->rate;
+	u32 val;
+	enum kp_band kp_index;
+	unsigned long ref_freq;
+
+	/*
+	 * reference frequency = parent frequency / PDIV
+	 * If PDIV = 0, then it becomes a multiplier (x2)
+	 */
+	if (vco->pdiv == 0)
+		ref_freq = parent_rate * 2;
+	else
+		ref_freq = parent_rate / vco->pdiv;
+
+	/* determine Ki and Kp index based on target VCO frequency */
+	if (rate >= VCO_LOW && rate < VCO_HIGH) {
+		ki = 4;
+		kp_index = KP_BAND_MID;
+	} else if (rate >= VCO_HIGH && rate && rate < VCO_HIGH_HIGH) {
+		ki = 3;
+		kp_index = KP_BAND_HIGH;
+	} else if (rate >= VCO_HIGH_HIGH && rate < VCO_MAX) {
+		ki = 3;
+		kp_index = KP_BAND_HIGH_HIGH;
+	} else {
+		pr_err("%s: pll: %s has invalid rate: %lu\n", __func__,
+				pll->name, rate);
+		return -EINVAL;
+	}
+
+	kp = get_kp(ref_freq, kp_index);
+	if (kp < 0) {
+		pr_err("%s: pll: %s has invalid kp\n", __func__, pll->name);
+		return kp;
+	}
+
+	ret = __pll_enable(pll);
+	if (ret) {
+		pr_err("%s: pll: %s fails to enable\n", __func__, pll->name);
+		return ret;
+	}
+
+	/* put PLL in reset */
+	__pll_put_in_reset(pll);
+
+	writel(0, pll->pll_base + ctrl->vco_ctrl.u_offset);
+	val = readl(pll->pll_base + ctrl->vco_ctrl.l_offset);
+
+	if (rate >= VCO_LOW && rate < VCO_MID)
+		val |= (1 << PLL_VCO_LOW_SHIFT);
+
+	if (rate < VCO_HIGH)
+		val &= ~(1 << PLL_VCO_HIGH_SHIFT);
+	else
+		val |= (1 << PLL_VCO_HIGH_SHIFT);
+
+	writel(val, pll->pll_base + ctrl->vco_ctrl.l_offset);
+
+	/* program integer part of NDIV */
+	val = readl(pll->pll_base + ctrl->ndiv_int.offset);
+	val &= ~(bit_mask(ctrl->ndiv_int.width) << ctrl->ndiv_int.shift);
+	val |= vco->ndiv_int << ctrl->ndiv_int.shift;
+	writel(val, pll->pll_base + ctrl->ndiv_int.offset);
+
+	/* program fractional part of NDIV */
+	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
+		val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
+		val &= ~(bit_mask(ctrl->ndiv_frac.width) <<
+				ctrl->ndiv_frac.shift);
+		val |= vco->ndiv_frac << ctrl->ndiv_frac.shift;
+		writel(val, pll->pll_base + ctrl->ndiv_frac.offset);
+	}
+
+	/* program PDIV */
+	val = readl(pll->pll_base + ctrl->pdiv.offset);
+	val &= ~(bit_mask(ctrl->pdiv.width) << ctrl->pdiv.shift);
+	val |= vco->pdiv << ctrl->pdiv.shift;
+	writel(val, pll->pll_base + ctrl->pdiv.offset);
+
+	__pll_bring_out_reset(pll, kp, ka, ki);
+
+	ret = pll_wait_for_lock(pll);
+	if (ret < 0) {
+		pr_err("%s: pll: %s failed to lock\n", __func__, pll->name);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int iproc_pll_enable(struct clk_hw *hw)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+
+	return __pll_enable(pll);
+}
+
+static void iproc_pll_disable(struct clk_hw *hw)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+
+	if (ctrl->flags & IPROC_CLK_AON)
+		return;
+
+	__pll_disable(pll);
+}
+
+static unsigned long iproc_pll_recalc_rate(struct clk_hw *hw,
+	unsigned long parent_rate)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+	u64 ndiv;
+	unsigned int ndiv_int, ndiv_frac, pdiv;
+
+	if (parent_rate == 0)
+		return 0;
+
+	/* PLL needs to be locked */
+	val = readl(pll->pll_base + ctrl->status.offset);
+	if ((val & (1 << ctrl->status.shift)) == 0) {
+		pll->rate = 0;
+		return 0;
+	}
+
+	/*
+	 * PLL output frequency =
+	 *
+	 * ((ndiv_int + ndiv_frac / 2^20) * (parent clock rate / pdiv)
+	 */
+	val = readl(pll->pll_base + ctrl->ndiv_int.offset);
+	ndiv_int = (val >> ctrl->ndiv_int.shift) &
+		bit_mask(ctrl->ndiv_int.width);
+	ndiv = ndiv_int << ctrl->ndiv_int.shift;
+
+	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
+		val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
+		ndiv_frac = (val >> ctrl->ndiv_frac.shift) &
+			bit_mask(ctrl->ndiv_frac.width);
+
+		if (ndiv_frac != 0)
+			ndiv = (ndiv_int << ctrl->ndiv_int.shift) | ndiv_frac;
+	}
+
+	val = readl(pll->pll_base + ctrl->pdiv.offset);
+	pdiv = (val >> ctrl->pdiv.shift) & bit_mask(ctrl->pdiv.width);
+
+	pll->rate = (ndiv * parent_rate) >> ctrl->ndiv_int.shift;
+
+	if (pdiv == 0)
+		pll->rate *= 2;
+	else
+		pll->rate /= pdiv;
+
+	return pll->rate;
+}
+
+static const struct clk_ops iproc_pll_ops = {
+	.enable = iproc_pll_enable,
+	.disable = iproc_pll_disable,
+	.recalc_rate = iproc_pll_recalc_rate,
+};
+
+void __init iproc_pll_setup(struct device_node *node,
+		const struct iproc_pll_ctrl *ctrl,
+		const struct iproc_pll_vco_freq_param *vco_param,
+		unsigned int num_vco_entries)
+{
+	int ret;
+	struct clk *clk;
+	struct iproc_pll *pll;
+	struct clk_init_data init;
+	const char *parent_name;
+	unsigned int rate;
+
+	if (WARN_ON(!ctrl))
+		return;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->pll_base = of_iomap(node, 0);
+	if (WARN_ON(!pll->pll_base))
+		goto err_pll_iomap;
+
+	pll->pwr_base = of_iomap(node, 1);
+	if (WARN_ON(!pll->pwr_base))
+		goto err_pwr_iomap;
+
+	/* some PLLs require gating control at the top ASIU level */
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		pll->asiu_base = of_iomap(node, 2);
+		if (WARN_ON(!pll->asiu_base))
+			goto err_asiu_iomap;
+	}
+
+	pll->ctrl = ctrl;
+	pll->name = node->name;
+	init.name = node->name;
+	init.ops = &iproc_pll_ops;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	pll->hw.init = &init;
+
+	/* configure the PLL to the desired VCO frequency if specified */
+	ret = of_property_read_u32(node, "clock-frequency", &rate);
+	if (!ret) {
+		unsigned long parent_rate;
+		int rate_index;
+
+		if (WARN_ON(!vco_param))
+			goto err_clk_register;
+
+		pll->num_vco_entries = num_vco_entries;
+		pll->vco_param = vco_param;
+
+		parent_rate = __get_rate(parent_name);
+		if (WARN_ON(!parent_rate))
+			goto err_clk_register;
+
+		rate_index = pll_get_rate_index(pll, rate);
+		if (WARN_ON(rate_index < 0))
+			goto err_clk_register;
+
+		ret = pll_set_rate(pll, rate_index, parent_rate);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+	}
+
+	clk = clk_register(NULL, &pll->hw);
+	if (WARN_ON(IS_ERR(clk)))
+		goto err_clk_register;
+
+	pll->clk_data.clk_num = 1;
+	pll->clk_data.clks = &clk;
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get,
+			&pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_add;
+
+	return;
+
+err_clk_add:
+	clk_unregister(clk);
+err_clk_register:
+	if (pll->asiu_base)
+		iounmap(pll->asiu_base);
+err_asiu_iomap:
+	iounmap(pll->pwr_base);
+err_pwr_iomap:
+	iounmap(pll->pll_base);
+err_pll_iomap:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc.h b/drivers/clk/bcm/clk-iproc.h
new file mode 100644
index 0000000..4aa0479
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc.h
@@ -0,0 +1,155 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _CLK_IPROC_H
+#define _CLK_IPROC_H
+
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/of.h>
+#include <linux/clk-provider.h>
+
+#define IPROC_CLK_NAME_LEN 25
+#define IPROC_CLK_INVALID_OFFSET 0xffffffff
+#define bit_mask(width) ((1 << (width)) - 1)
+
+/* clock should not be disabled at runtime */
+#define IPROC_CLK_AON BIT(0)
+
+/* PLL requires gating through ASIU */
+#define IPROC_CLK_PLL_ASIU BIT(1)
+
+/* PLL has fractional part of the NDIV */
+#define IPROC_CLK_PLL_HAS_NDIV_FRAC BIT(2)
+
+/*
+ * Parameters for VCO frequency configuration
+ *
+ * VCO frequency =
+ * ((ndiv_int + ndiv_frac / 2^20) * (ref freqeuncy  / pdiv)
+ */
+struct iproc_pll_vco_freq_param {
+	unsigned long rate;
+	unsigned int ndiv_int;
+	unsigned int ndiv_frac;
+	unsigned int pdiv;
+};
+
+struct iproc_clk_reg_op {
+	unsigned int offset;
+	unsigned int shift;
+	unsigned int width;
+};
+
+/*
+ * Clock gating control at the top ASIU level
+ */
+struct iproc_asiu_gate {
+	unsigned int offset;
+	unsigned int en_shift;
+};
+
+/*
+ * Control of powering on/off of a PLL
+ *
+ * Before powering off a PLL, input isolation (ISO) needs to be enabled
+ */
+struct iproc_pll_aon_pwr_ctrl {
+	unsigned int offset;
+	unsigned int pwr_width;
+	unsigned int pwr_shift;
+	unsigned int iso_shift;
+};
+
+/*
+ * Control of the PLL reset, with Ki, Kp, and Ka parameters
+ */
+struct iproc_pll_reset_ctrl {
+	unsigned int offset;
+	unsigned int reset_shift;
+	unsigned int p_reset_shift;
+	unsigned int ki_shift;
+	unsigned int ki_width;
+	unsigned int kp_shift;
+	unsigned int kp_width;
+	unsigned int ka_shift;
+	unsigned int ka_width;
+};
+
+struct iproc_pll_vco_ctrl {
+	unsigned int u_offset;
+	unsigned int l_offset;
+};
+
+/*
+ * Main PLL control parameters
+ */
+struct iproc_pll_ctrl {
+	unsigned long flags;
+	struct iproc_pll_aon_pwr_ctrl aon;
+	struct iproc_asiu_gate asiu;
+	struct iproc_pll_reset_ctrl reset;
+	struct iproc_clk_reg_op ndiv_int;
+	struct iproc_clk_reg_op ndiv_frac;
+	struct iproc_clk_reg_op pdiv;
+	struct iproc_pll_vco_ctrl vco_ctrl;
+	struct iproc_clk_reg_op status;
+};
+
+/*
+ * Controls enabling/disabling a PLL derived clock
+ */
+struct iproc_clk_enable_ctrl {
+	unsigned int offset;
+	unsigned int enable_shift;
+	unsigned int hold_shift;
+	unsigned int bypass_shift;
+};
+
+/*
+ * Main clock control parameters for clocks derived from the PLLs
+ */
+struct iproc_clk_ctrl {
+	unsigned int channel;
+	unsigned long flags;
+	struct iproc_clk_enable_ctrl enable;
+	struct iproc_clk_reg_op mdiv;
+};
+
+/*
+ * Divisor of the ASIU clocks
+ */
+struct iproc_asiu_div {
+	unsigned int offset;
+	unsigned int en_shift;
+	unsigned int high_shift;
+	unsigned int high_width;
+	unsigned int low_shift;
+	unsigned int low_width;
+};
+
+extern void __init iproc_armpll_setup(struct device_node *node);
+extern void __init iproc_pll_setup(struct device_node *node,
+		const struct iproc_pll_ctrl *ctrl,
+		const struct iproc_pll_vco_freq_param *vco_param,
+		unsigned int num_freqs);
+extern void __init iproc_clk_setup(struct device_node *node,
+		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks);
+extern void __init iproc_asiu_setup(struct device_node *node,
+		const struct iproc_asiu_div *div,
+		const struct iproc_asiu_gate *gate, unsigned int num_clks);
+
+#endif /* _CLK_IPROC_H */
-- 
1.7.9.5

[PATCH 2/4] clk: iproc: add initial common clock support

[Ray Jui]

This adds basic and generic support for various iProc PLLs and clocks
including the ARMPLL, GENPLL, LCPLL, MIPIPLL, and ASIU clocks.

SoCs under the iProc architecture can define their specific register
offsets and clock parameters for their PLL and clock controllers. These
parameters can be passed as arugments into the generic iProc PLL and
clock setup functions

Derived from code originally provided by Jonathan Richardson
<jonathar@broadcom.com>

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/clk/Makefile               |    2 +-
 drivers/clk/bcm/Kconfig            |    9 +
 drivers/clk/bcm/Makefile           |    1 +
 drivers/clk/bcm/clk-iproc-armpll.c |  286 +++++++++++++++++++++
 drivers/clk/bcm/clk-iproc-asiu.c   |  275 ++++++++++++++++++++
 drivers/clk/bcm/clk-iproc-clk.c    |  238 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-pll.c    |  483 ++++++++++++++++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc.h        |  155 ++++++++++++
 8 files changed, 1448 insertions(+), 1 deletion(-)
 create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
 create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
 create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
 create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
 create mode 100644 drivers/clk/bcm/clk-iproc.h

diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index d5fba5b..eff0213 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -41,7 +41,7 @@ obj-$(CONFIG_ARCH_VT8500)		+= clk-vt8500.o
 obj-$(CONFIG_COMMON_CLK_WM831X)		+= clk-wm831x.o
 obj-$(CONFIG_COMMON_CLK_XGENE)		+= clk-xgene.o
 obj-$(CONFIG_COMMON_CLK_AT91)		+= at91/
-obj-$(CONFIG_ARCH_BCM_MOBILE)		+= bcm/
+obj-$(CONFIG_ARCH_BCM)			+= bcm/
 obj-$(CONFIG_ARCH_BERLIN)		+= berlin/
 obj-$(CONFIG_ARCH_HI3xxx)		+= hisilicon/
 obj-$(CONFIG_ARCH_HIP04)		+= hisilicon/
diff --git a/drivers/clk/bcm/Kconfig b/drivers/clk/bcm/Kconfig
index 75506e5..66b5b7f 100644
--- a/drivers/clk/bcm/Kconfig
+++ b/drivers/clk/bcm/Kconfig
@@ -7,3 +7,12 @@ config CLK_BCM_KONA
 	  Enable common clock framework support for Broadcom SoCs
 	  using "Kona" style clock control units, including those
 	  in the BCM281xx and BCM21664 families.
+
+config COMMON_CLK_IPROC
+	bool "Broadcom iProc clock support"
+	depends on ARCH_BCM_IPROC
+	depends on COMMON_CLK
+	default y
+	help
+	  Enable common clock framework support for Broadcom SoCs
+	  based on the "iProc" architecture
diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
index 6297d05..6926636 100644
--- a/drivers/clk/bcm/Makefile
+++ b/drivers/clk/bcm/Makefile
@@ -2,3 +2,4 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
+obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
diff --git a/drivers/clk/bcm/clk-iproc-armpll.c b/drivers/clk/bcm/clk-iproc-armpll.c
new file mode 100644
index 0000000..ec9b130
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-armpll.c
@@ -0,0 +1,286 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+
+#define IPROC_CLK_MAX_FREQ_POLICY                    0x3
+#define IPROC_CLK_POLICY_FREQ_OFFSET                 0x008
+#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT      8
+#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK       0x7
+
+#define IPROC_CLK_PLLARMA_OFFSET                     0xc00
+#define IPROC_CLK_PLLARMA_LOCK_SHIFT                 28
+#define IPROC_CLK_PLLARMA_PDIV_SHIFT                 24
+#define IPROC_CLK_PLLARMA_PDIV_MASK                  0xf
+#define IPROC_CLK_PLLARMA_NDIV_INT_SHIFT             8
+#define IPROC_CLK_PLLARMA_NDIV_INT_MASK              0x3ff
+
+#define IPROC_CLK_PLLARMB_OFFSET                     0xc04
+#define IPROC_CLK_PLLARMB_NDIV_FRAC_MASK             0xfffff
+
+#define IPROC_CLK_PLLARMC_OFFSET                     0xc08
+#define IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT            8
+#define IPROC_CLK_PLLARMC_MDIV_MASK                  0xff
+
+#define IPROC_CLK_PLLARMCTL5_OFFSET                  0xc20
+#define IPROC_CLK_PLLARMCTL5_H_MDIV_MASK             0xff
+
+#define IPROC_CLK_PLLARM_OFFSET_OFFSET               0xc24
+#define IPROC_CLK_PLLARM_SW_CTL_SHIFT                29
+#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT       20
+#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK        0xff
+#define IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK       0xfffff
+
+#define IPROC_CLK_ARM_DIV_OFFSET                     0xe00
+#define IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT  4
+#define IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK        0xf
+
+#define IPROC_CLK_POLICY_DBG_OFFSET                  0xec0
+#define IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT          12
+#define IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK           0x7
+
+enum iproc_arm_pll_fid {
+	ARM_PLL_FID_CRYSTAL_CLK   = 0,
+	ARM_PLL_FID_SYS_CLK       = 2,
+	ARM_PLL_FID_CH0_SLOW_CLK  = 6,
+	ARM_PLL_FID_CH1_FAST_CLK  = 7
+};
+
+struct iproc_arm_pll {
+	struct clk_hw hw;
+	void __iomem *base;
+	struct clk_onecell_data clk_data;
+	unsigned long rate;
+};
+
+#define to_iproc_arm_pll(hw) container_of(hw, struct iproc_arm_pll, hw)
+
+static unsigned int __get_fid(struct iproc_arm_pll *pll)
+{
+	u32 val;
+	unsigned int policy, fid, active_fid;
+
+	val = readl(pll->base + IPROC_CLK_ARM_DIV_OFFSET);
+	if (val & (1 << IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT))
+		policy = val & IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK;
+	else
+		policy = 0;
+
+	/* something is seriously wrong */
+	BUG_ON(policy > IPROC_CLK_MAX_FREQ_POLICY);
+
+	val = readl(pll->base + IPROC_CLK_POLICY_FREQ_OFFSET);
+	fid = (val >> (IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT * policy)) &
+		IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK;
+
+	val = readl(pll->base + IPROC_CLK_POLICY_DBG_OFFSET);
+	active_fid = IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK &
+		(val >> IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT);
+	if (fid != active_fid) {
+		pr_debug("%s: fid override %u->%u\n", __func__,	fid,
+				active_fid);
+		fid = active_fid;
+	}
+
+	pr_debug("%s: active fid: %u\n", __func__, fid);
+
+	return fid;
+}
+
+/*
+ * Determine the mdiv (post divider) based on the frequency ID being used.
+ * There are 4 sources that can be used to derive the output clock rate:
+ *    - 25 MHz Crystal
+ *    - System clock
+ *    - PLL channel 0 (slow clock)
+ *    - PLL channel 1 (fast clock)
+ */
+static int __get_mdiv(struct iproc_arm_pll *pll)
+{
+	unsigned int fid;
+	int mdiv;
+	u32 val;
+
+	fid = __get_fid(pll);
+
+	switch (fid) {
+	case ARM_PLL_FID_CRYSTAL_CLK:
+	case ARM_PLL_FID_SYS_CLK:
+		mdiv = 1;
+		break;
+
+	case ARM_PLL_FID_CH0_SLOW_CLK:
+		val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
+		mdiv = val & IPROC_CLK_PLLARMC_MDIV_MASK;
+		if (mdiv == 0)
+			mdiv = 256;
+		break;
+
+	case ARM_PLL_FID_CH1_FAST_CLK:
+		val = readl(pll->base +	IPROC_CLK_PLLARMCTL5_OFFSET);
+		mdiv = val & IPROC_CLK_PLLARMCTL5_H_MDIV_MASK;
+		if (mdiv == 0)
+			mdiv = 256;
+		break;
+
+	default:
+		mdiv = -EFAULT;
+	}
+
+	return mdiv;
+}
+
+static unsigned int __get_ndiv(struct iproc_arm_pll *pll)
+{
+	u32 val;
+	unsigned int ndiv_int, ndiv_frac, ndiv;
+
+	val = readl(pll->base + IPROC_CLK_PLLARM_OFFSET_OFFSET);
+	if (val & (1 << IPROC_CLK_PLLARM_SW_CTL_SHIFT)) {
+		/*
+		 * offset mode is active. Read the ndiv from the PLLARM OFFSET
+		 * register
+		 */
+		ndiv_int = (val >> IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT) &
+			IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK;
+		if (ndiv_int == 0)
+			ndiv_int = 256;
+
+		ndiv_frac = val & IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK;
+	} else {
+		/* offset mode not active */
+		val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
+		ndiv_int = (val >> IPROC_CLK_PLLARMA_NDIV_INT_SHIFT) &
+			IPROC_CLK_PLLARMA_NDIV_INT_MASK;
+		if (ndiv_int == 0)
+			ndiv_int = 1024;
+
+		val = readl(pll->base + IPROC_CLK_PLLARMB_OFFSET);
+		ndiv_frac = val & IPROC_CLK_PLLARMB_NDIV_FRAC_MASK;
+	}
+
+	ndiv = (ndiv_int << 20) | ndiv_frac;
+
+	return ndiv;
+}
+
+/*
+ * The output frequency of the ARM PLL is calculated based on the ARM PLL
+ * divider values:
+ *   pdiv = ARM PLL pre-divider
+ *   ndiv = ARM PLL multiplier
+ *   mdiv = ARM PLL post divider
+ *
+ * The frequency is calculated by:
+ *   ((ndiv * parent clock rate) / pdiv) / mdiv
+ */
+static unsigned long iproc_arm_pll_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_arm_pll *pll = to_iproc_arm_pll(hw);
+	u32 val;
+	int mdiv;
+	u64 ndiv;
+	unsigned int pdiv;
+
+	/* in bypass mode, use parent rate */
+	val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
+	if (val & (1 << IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT)) {
+		pll->rate = parent_rate;
+		return pll->rate;
+	}
+
+	/* PLL needs to be locked */
+	val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
+	if (!(val & (1 << IPROC_CLK_PLLARMA_LOCK_SHIFT))) {
+		pll->rate = 0;
+		return 0;
+	}
+
+	pdiv = (val >> IPROC_CLK_PLLARMA_PDIV_SHIFT) &
+		IPROC_CLK_PLLARMA_PDIV_MASK;
+	if (pdiv == 0)
+		pdiv = 16;
+
+	ndiv = __get_ndiv(pll);
+	mdiv = __get_mdiv(pll);
+	if (mdiv <= 0) {
+		pll->rate = 0;
+		return 0;
+	}
+	pll->rate = (ndiv * parent_rate) >> 20;
+	pll->rate = (pll->rate / pdiv) / mdiv;
+
+	pr_debug("%s: ARM PLL rate: %lu. parent rate: %lu\n", __func__,
+			pll->rate, parent_rate);
+	pr_debug("%s: ndiv_int: %u, pdiv: %u, mdiv: %d\n", __func__,
+			(unsigned int)(ndiv >> 20), pdiv, mdiv);
+
+	return pll->rate;
+}
+
+static const struct clk_ops iproc_arm_pll_ops = {
+	.recalc_rate = iproc_arm_pll_recalc_rate,
+};
+
+void __init iproc_armpll_setup(struct device_node *node)
+{
+	int ret;
+	struct clk *clk;
+	struct iproc_arm_pll *pll;
+	struct clk_init_data init;
+	const char *parent_name;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->base = of_iomap(node, 0);
+	if (WARN_ON(!pll->base))
+		goto err_free_pll;
+
+	init.name = node->name;
+	init.ops = &iproc_arm_pll_ops;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	pll->hw.init = &init;
+
+	clk = clk_register(NULL, &pll->hw);
+	if (WARN_ON(IS_ERR(clk)))
+		goto err_iounmap;
+
+	pll->clk_data.clk_num = 1;
+	pll->clk_data.clks = &clk;
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_unregister;
+
+	return;
+
+err_clk_unregister:
+	clk_unregister(clk);
+err_iounmap:
+	iounmap(pll->base);
+err_free_pll:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc-asiu.c b/drivers/clk/bcm/clk-iproc-asiu.c
new file mode 100644
index 0000000..ab86b8c
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-asiu.c
@@ -0,0 +1,275 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+struct iproc_asiu;
+
+struct iproc_asiu_clk {
+	struct clk_hw hw;
+	const char *name;
+	struct iproc_asiu *asiu;
+	unsigned long rate;
+	struct iproc_asiu_div div;
+	struct iproc_asiu_gate gate;
+};
+
+struct iproc_asiu {
+	void __iomem *div_base;
+	void __iomem *gate_base;
+
+	struct clk_onecell_data clk_data;
+	struct iproc_asiu_clk *clks;
+};
+
+#define to_asiu_clk(hw) container_of(hw, struct iproc_asiu_clk, hw)
+
+static int iproc_asiu_clk_enable(struct clk_hw *hw)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+
+	/* some clocks at the ASIU level are always enabled */
+	if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
+		return 0;
+
+	val = readl(asiu->gate_base + clk->gate.offset);
+	val |= (1 << clk->gate.en_shift);
+	writel(val, asiu->gate_base + clk->gate.offset);
+
+	return 0;
+}
+
+static void iproc_asiu_clk_disable(struct clk_hw *hw)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+
+	/* some clocks at the ASIU level are always enabled */
+	if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
+		return;
+
+	val = readl(asiu->gate_base + clk->gate.offset);
+	val &= ~(1 << clk->gate.en_shift);
+	writel(val, asiu->gate_base + clk->gate.offset);
+}
+
+static unsigned long iproc_asiu_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+	unsigned int div_h, div_l;
+
+	if (parent_rate == 0) {
+		clk->rate = 0;
+		return 0;
+	}
+
+	/* if clock divisor is not enabled, simply return parent rate */
+	val = readl(asiu->div_base + clk->div.offset);
+	if ((val & (1 << clk->div.en_shift)) == 0) {
+		clk->rate = parent_rate;
+		return parent_rate;
+	}
+
+	/* clock rate = parent rate / (high_div + 1) + (low_div + 1) */
+	div_h = (val >> clk->div.high_shift) & bit_mask(clk->div.high_width);
+	div_h++;
+	div_l = (val >> clk->div.low_shift) & bit_mask(clk->div.low_width);
+	div_l++;
+
+	clk->rate = parent_rate / (div_h + div_l);
+	pr_debug("%s: rate: %lu. parent rate: %lu div_h: %u div_l: %u\n",
+		__func__, clk->rate, parent_rate, div_h, div_l);
+
+	return clk->rate;
+}
+
+static long iproc_asiu_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	unsigned int div;
+
+	if (rate == 0 || *parent_rate == 0)
+		return -EINVAL;
+
+	if (rate == *parent_rate)
+		return *parent_rate;
+
+	div = DIV_ROUND_UP(*parent_rate, rate);
+	if (div < 2)
+		return *parent_rate;
+
+	return *parent_rate / div;
+}
+
+static int iproc_asiu_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	unsigned int div, div_h, div_l;
+	u32 val;
+
+	if (rate == 0 || parent_rate == 0)
+		return -EINVAL;
+
+	/* simply disable the divisor if one wants the same rate as parent */
+	if (rate == parent_rate) {
+		val = readl(asiu->div_base + clk->div.offset);
+		val &= ~(1 << clk->div.en_shift);
+		writel(val, asiu->div_base + clk->div.offset);
+		return 0;
+	}
+
+	div = DIV_ROUND_UP(parent_rate, rate);
+	if (div < 2)
+		return -EINVAL;
+
+	div_h = div_l = div >> 1;
+	div_h--;
+	div_l--;
+
+	val = readl(asiu->div_base + clk->div.offset);
+	val |= 1 << clk->div.en_shift;
+	if (div_h) {
+		val &= ~(bit_mask(clk->div.high_width)
+				<< clk->div.high_shift);
+		val |= div_h << clk->div.high_shift;
+	} else {
+		val &= ~(bit_mask(clk->div.high_width)
+				<< clk->div.high_shift);
+	}
+	if (div_l) {
+		val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
+		val |= div_l << clk->div.low_shift;
+	} else {
+		val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
+	}
+	writel(val, asiu->div_base + clk->div.offset);
+
+	return 0;
+}
+
+static const struct clk_ops iproc_asiu_ops = {
+	.enable = iproc_asiu_clk_enable,
+	.disable = iproc_asiu_clk_disable,
+	.recalc_rate = iproc_asiu_clk_recalc_rate,
+	.round_rate = iproc_asiu_clk_round_rate,
+	.set_rate = iproc_asiu_clk_set_rate,
+};
+
+void __init iproc_asiu_setup(struct device_node *node,
+		const struct iproc_asiu_div *div,
+		const struct iproc_asiu_gate *gate, unsigned int num_clks)
+{
+	int i, ret;
+	struct iproc_asiu *asiu;
+
+	if (WARN_ON(!gate || !div))
+		return;
+
+	asiu = kzalloc(sizeof(*asiu), GFP_KERNEL);
+	if (WARN_ON(!asiu))
+		return;
+
+	asiu->clk_data.clk_num = num_clks;
+	asiu->clk_data.clks = kcalloc(num_clks, sizeof(*asiu->clk_data.clks),
+			GFP_KERNEL);
+	if (WARN_ON(!asiu->clk_data.clks))
+		goto err_clks;
+
+	asiu->clks = kcalloc(num_clks, sizeof(*asiu->clks), GFP_KERNEL);
+	if (WARN_ON(!asiu->clks))
+		goto err_asiu_clks;
+
+	asiu->div_base = of_iomap(node, 0);
+	if (WARN_ON(!asiu->div_base))
+		goto err_iomap_div;
+
+	asiu->gate_base = of_iomap(node, 1);
+	if (WARN_ON(!asiu->gate_base))
+		goto err_iomap_gate;
+
+	for (i = 0; i < num_clks; i++) {
+		struct clk_init_data init;
+		struct clk *clk;
+		const char *parent_name;
+		struct iproc_asiu_clk *asiu_clk;
+		const char *clk_name;
+
+		clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
+		if (WARN_ON(!clk_name))
+			goto err_clk_register;
+
+		ret = of_property_read_string_index(node, "clock-output-names",
+				i, &clk_name);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+
+		asiu_clk = &asiu->clks[i];
+		asiu_clk->name = clk_name;
+		asiu_clk->asiu = asiu;
+		asiu_clk->div = div[i];
+		asiu_clk->gate = gate[i];
+		init.name = clk_name;
+		init.ops = &iproc_asiu_ops;
+		init.flags = 0;
+		parent_name = of_clk_get_parent_name(node, 0);
+		init.parent_names = (parent_name ? &parent_name : NULL);
+		init.num_parents = (parent_name ? 1 : 0);
+		asiu_clk->hw.init = &init;
+
+		clk = clk_register(NULL, &asiu_clk->hw);
+		if (WARN_ON(IS_ERR(clk)))
+			goto err_clk_register;
+		asiu->clk_data.clks[i] = clk;
+	}
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get,
+			&asiu->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_register;
+
+	return;
+
+err_clk_register:
+	for (i = 0; i < num_clks; i++)
+		kfree(asiu->clks[i].name);
+	iounmap(asiu->gate_base);
+
+err_iomap_gate:
+	iounmap(asiu->div_base);
+
+err_iomap_div:
+	kfree(asiu->clks);
+
+err_asiu_clks:
+	kfree(asiu->clk_data.clks);
+
+err_clks:
+	kfree(asiu);
+}
diff --git a/drivers/clk/bcm/clk-iproc-clk.c b/drivers/clk/bcm/clk-iproc-clk.c
new file mode 100644
index 0000000..be3c42c
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-clk.c
@@ -0,0 +1,238 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+struct iproc_pll;
+
+struct iproc_clk {
+	struct clk_hw hw;
+	const char *name;
+	struct iproc_pll *pll;
+	unsigned long rate;
+	const struct iproc_clk_ctrl *ctrl;
+};
+
+struct iproc_pll {
+	void __iomem *base;
+	struct clk_onecell_data clk_data;
+	struct iproc_clk *clks;
+};
+
+#define to_iproc_clk(hw) container_of(hw, struct iproc_clk, hw)
+
+static int iproc_clk_enable(struct clk_hw *hw)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+
+	/* channel enable is active low */
+	val = readl(pll->base + ctrl->enable.offset);
+	val &= ~(1 << ctrl->enable.enable_shift);
+	writel(val, pll->base + ctrl->enable.offset);
+
+	/* also make sure channel is not held */
+	val = readl(pll->base + ctrl->enable.offset);
+	val &= ~(1 << ctrl->enable.hold_shift);
+	writel(val, pll->base + ctrl->enable.offset);
+
+	return 0;
+}
+
+static void iproc_clk_disable(struct clk_hw *hw)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+
+	if (ctrl->flags & IPROC_CLK_AON)
+		return;
+
+	val = readl(pll->base + ctrl->enable.offset);
+	val |= 1 << ctrl->enable.enable_shift;
+	writel(val, pll->base + ctrl->enable.offset);
+}
+
+static unsigned long iproc_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+	unsigned int mdiv;
+
+	if (parent_rate == 0)
+		return 0;
+
+	val = readl(pll->base + ctrl->mdiv.offset);
+	mdiv = (val >> ctrl->mdiv.shift) & bit_mask(ctrl->mdiv.width);
+	if (mdiv == 0)
+		mdiv = 256;
+
+	clk->rate = parent_rate / mdiv;
+
+	return clk->rate;
+}
+
+static long iproc_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	unsigned int div;
+
+	if (rate == 0 || *parent_rate == 0)
+		return -EINVAL;
+
+	if (rate == *parent_rate)
+		return *parent_rate;
+
+	div = DIV_ROUND_UP(*parent_rate, rate);
+	if (div < 2)
+		return *parent_rate;
+
+	if (div > 256)
+		div = 256;
+
+	return *parent_rate / div;
+}
+
+static int iproc_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+	unsigned int div;
+
+	if (rate == 0 || parent_rate == 0)
+		return -EINVAL;
+
+	div = DIV_ROUND_UP(parent_rate, rate);
+	if (div > 256)
+		return -EINVAL;
+
+	val = readl(pll->base + ctrl->mdiv.offset);
+	if (div == 256) {
+		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
+	} else {
+		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
+		val |= div << ctrl->mdiv.shift;
+	}
+	writel(val, pll->base + ctrl->mdiv.offset);
+	clk->rate = parent_rate / div;
+
+	return 0;
+}
+
+static const struct clk_ops iproc_clk_ops = {
+	.enable = iproc_clk_enable,
+	.disable = iproc_clk_disable,
+	.recalc_rate = iproc_clk_recalc_rate,
+	.round_rate = iproc_clk_round_rate,
+	.set_rate = iproc_clk_set_rate,
+};
+
+void __init iproc_clk_setup(struct device_node *node,
+		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks)
+{
+	int i, ret;
+	struct iproc_pll *pll;
+
+	if (WARN_ON(!ctrl))
+		return;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->clk_data.clk_num = num_clks;
+	pll->clk_data.clks = kcalloc(num_clks, sizeof(*pll->clk_data.clks),
+			GFP_KERNEL);
+	if (WARN_ON(!pll->clk_data.clks))
+		goto err_clks;
+
+	pll->clks = kcalloc(num_clks, sizeof(*pll->clks), GFP_KERNEL);
+	if (WARN_ON(!pll->clks))
+		goto err_pll_clks;
+
+	pll->base = of_iomap(node, 0);
+	if (WARN_ON(!pll->base))
+		goto err_iomap;
+
+	for (i = 0; i < num_clks; i++) {
+		struct clk_init_data init;
+		struct clk *clk;
+		const char *parent_name;
+		struct iproc_clk *iclk;
+		const char *clk_name;
+
+		clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
+		if (WARN_ON(!clk_name))
+			goto err_clk_register;
+
+		ret = of_property_read_string_index(node, "clock-output-names",
+				i, &clk_name);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+
+		iclk = &pll->clks[i];
+		iclk->name = clk_name;
+		iclk->pll = pll;
+		iclk->ctrl = &ctrl[i];
+		init.name = clk_name;
+		init.ops = &iproc_clk_ops;
+		init.flags = 0;
+		parent_name = of_clk_get_parent_name(node, 0);
+		init.parent_names = (parent_name ? &parent_name : NULL);
+		init.num_parents = (parent_name ? 1 : 0);
+		iclk->hw.init = &init;
+
+		clk = clk_register(NULL, &iclk->hw);
+		if (WARN_ON(IS_ERR(clk)))
+			goto err_clk_register;
+		pll->clk_data.clks[i] = clk;
+	}
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_register;
+
+	return;
+
+err_clk_register:
+	for (i = 0; i < num_clks; i++)
+		kfree(pll->clks[i].name);
+	iounmap(pll->base);
+
+err_iomap:
+	kfree(pll->clks);
+
+err_pll_clks:
+	kfree(pll->clk_data.clks);
+
+err_clks:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc-pll.c b/drivers/clk/bcm/clk-iproc-pll.c
new file mode 100644
index 0000000..cd3bd38
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-pll.c
@@ -0,0 +1,483 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+#define PLL_VCO_HIGH_SHIFT 19
+#define PLL_VCO_LOW_SHIFT  30
+
+/* number of delay loops waiting for PLL to lock */
+#define LOCK_DELAY 100
+
+/* number of VCO frequency bands */
+#define NUM_FREQ_BANDS 8
+
+#define NUM_KP_BANDS 3
+enum kp_band {
+	KP_BAND_MID = 0,
+	KP_BAND_HIGH,
+	KP_BAND_HIGH_HIGH
+};
+
+static const unsigned int kp_table[NUM_KP_BANDS][NUM_FREQ_BANDS] = {
+	{ 5, 6, 6, 7, 7, 8, 9, 10 },
+	{ 4, 4, 5, 5, 6, 7, 8, 9  },
+	{ 4, 5, 5, 6, 7, 8, 9, 10 },
+};
+
+static const unsigned long ref_freq_table[NUM_FREQ_BANDS][2] = {
+	{ 10000000,  12500000  },
+	{ 12500000,  15000000  },
+	{ 15000000,  20000000  },
+	{ 20000000,  25000000  },
+	{ 25000000,  50000000  },
+	{ 50000000,  75000000  },
+	{ 75000000,  100000000 },
+	{ 100000000, 125000000 },
+};
+
+enum vco_freq_range {
+	VCO_LOW       = 700000000U,
+	VCO_MID       = 1200000000U,
+	VCO_HIGH      = 2200000000U,
+	VCO_HIGH_HIGH = 3100000000U,
+	VCO_MAX       = 4000000000U,
+};
+
+struct iproc_pll {
+	struct clk_hw hw;
+	void __iomem *pll_base;
+	void __iomem *pwr_base;
+	void __iomem *asiu_base;
+	struct clk_onecell_data clk_data;
+	const char *name;
+	const struct iproc_pll_ctrl *ctrl;
+	const struct iproc_pll_vco_freq_param *vco_param;
+	unsigned int num_vco_entries;
+	unsigned long rate;
+};
+
+#define to_iproc_pll(hw) container_of(hw, struct iproc_pll, hw)
+
+/*
+ * Get the clock rate based on name
+ */
+static unsigned long __get_rate(const char *clk_name)
+{
+	struct clk *clk;
+
+	clk = __clk_lookup(clk_name);
+	if (!clk) {
+		pr_err("%s: unable to find clock by name: %s\n", __func__,
+				clk_name);
+		return 0;
+	}
+
+	return clk_get_rate(clk);
+}
+
+/*
+ * Based on the target frequency, find a match from the VCO frequency parameter
+ * table and return its index
+ */
+static int pll_get_rate_index(struct iproc_pll *pll, unsigned int target_rate)
+{
+	int i;
+
+	for (i = 0; i < pll->num_vco_entries; i++)
+		if (target_rate == pll->vco_param[i].rate)
+			break;
+
+	if (i >= pll->num_vco_entries)
+		return -EINVAL;
+
+	return i;
+}
+
+static int get_kp(unsigned long ref_freq, enum kp_band kp_index)
+{
+	int i;
+
+	if (ref_freq < ref_freq_table[0][0])
+		return -EINVAL;
+
+	for (i = 0; i < NUM_FREQ_BANDS; i++) {
+		if (ref_freq >= ref_freq_table[i][0] &&
+			ref_freq < ref_freq_table[i][1])
+			return kp_table[kp_index][i];
+	}
+	return -EINVAL;
+}
+
+static int pll_wait_for_lock(struct iproc_pll *pll)
+{
+	int i;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+
+	for (i = 0; i < LOCK_DELAY; i++) {
+		u32 val = readl(pll->pll_base + ctrl->status.offset);
+
+		if (val & (1 << ctrl->status.shift))
+			return 0;
+		udelay(10);
+	}
+
+	return -EIO;
+}
+
+static void __pll_disable(struct iproc_pll *pll)
+{
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		val = readl(pll->asiu_base + ctrl->asiu.offset);
+		val &= ~(1 << ctrl->asiu.en_shift);
+		writel(val, pll->asiu_base + ctrl->asiu.offset);
+	}
+
+	/* latch input value so core power can be shut down */
+	val = readl(pll->pwr_base + ctrl->aon.offset);
+	val |= (1 << ctrl->aon.iso_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+
+	/* power down the core */
+	val &= ~(bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+}
+
+static int __pll_enable(struct iproc_pll *pll)
+{
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+
+	/* power up the PLL and make sure it's not latched */
+	val = readl(pll->pwr_base + ctrl->aon.offset);
+	val |= bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift;
+	val &= ~(1 << ctrl->aon.iso_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+
+	/* certain PLLs also need to be ungated from the ASIU top level */
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		val = readl(pll->asiu_base + ctrl->asiu.offset);
+		val |= (1 << ctrl->asiu.en_shift);
+		writel(val, pll->asiu_base + ctrl->asiu.offset);
+	}
+
+	return 0;
+}
+
+static void __pll_put_in_reset(struct iproc_pll *pll)
+{
+	u32 val;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
+
+	val = readl(pll->pll_base + reset->offset);
+	val &= ~(1 << reset->reset_shift | 1 << reset->p_reset_shift);
+	writel(val, pll->pll_base + reset->offset);
+}
+
+static void __pll_bring_out_reset(struct iproc_pll *pll, unsigned int kp,
+		unsigned int ka, unsigned int ki)
+{
+	u32 val;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
+
+	val = readl(pll->pll_base + reset->offset);
+	val &= ~(bit_mask(reset->ki_width) << reset->ki_shift |
+		bit_mask(reset->kp_width) << reset->kp_shift |
+		bit_mask(reset->ka_width) << reset->ka_shift);
+	val |=  ki << reset->ki_shift | kp << reset->kp_shift |
+		ka << reset->ka_shift;
+	val |= 1 << reset->reset_shift | 1 << reset->p_reset_shift;
+	writel(val, pll->pll_base + reset->offset);
+}
+
+static int pll_set_rate(struct iproc_pll *pll, unsigned int rate_index,
+		unsigned long parent_rate)
+{
+	const struct iproc_pll_vco_freq_param *vco =
+				&pll->vco_param[rate_index];
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	int ka = 0, ki, kp, ret;
+	unsigned long rate = vco->rate;
+	u32 val;
+	enum kp_band kp_index;
+	unsigned long ref_freq;
+
+	/*
+	 * reference frequency = parent frequency / PDIV
+	 * If PDIV = 0, then it becomes a multiplier (x2)
+	 */
+	if (vco->pdiv == 0)
+		ref_freq = parent_rate * 2;
+	else
+		ref_freq = parent_rate / vco->pdiv;
+
+	/* determine Ki and Kp index based on target VCO frequency */
+	if (rate >= VCO_LOW && rate < VCO_HIGH) {
+		ki = 4;
+		kp_index = KP_BAND_MID;
+	} else if (rate >= VCO_HIGH && rate && rate < VCO_HIGH_HIGH) {
+		ki = 3;
+		kp_index = KP_BAND_HIGH;
+	} else if (rate >= VCO_HIGH_HIGH && rate < VCO_MAX) {
+		ki = 3;
+		kp_index = KP_BAND_HIGH_HIGH;
+	} else {
+		pr_err("%s: pll: %s has invalid rate: %lu\n", __func__,
+				pll->name, rate);
+		return -EINVAL;
+	}
+
+	kp = get_kp(ref_freq, kp_index);
+	if (kp < 0) {
+		pr_err("%s: pll: %s has invalid kp\n", __func__, pll->name);
+		return kp;
+	}
+
+	ret = __pll_enable(pll);
+	if (ret) {
+		pr_err("%s: pll: %s fails to enable\n", __func__, pll->name);
+		return ret;
+	}
+
+	/* put PLL in reset */
+	__pll_put_in_reset(pll);
+
+	writel(0, pll->pll_base + ctrl->vco_ctrl.u_offset);
+	val = readl(pll->pll_base + ctrl->vco_ctrl.l_offset);
+
+	if (rate >= VCO_LOW && rate < VCO_MID)
+		val |= (1 << PLL_VCO_LOW_SHIFT);
+
+	if (rate < VCO_HIGH)
+		val &= ~(1 << PLL_VCO_HIGH_SHIFT);
+	else
+		val |= (1 << PLL_VCO_HIGH_SHIFT);
+
+	writel(val, pll->pll_base + ctrl->vco_ctrl.l_offset);
+
+	/* program integer part of NDIV */
+	val = readl(pll->pll_base + ctrl->ndiv_int.offset);
+	val &= ~(bit_mask(ctrl->ndiv_int.width) << ctrl->ndiv_int.shift);
+	val |= vco->ndiv_int << ctrl->ndiv_int.shift;
+	writel(val, pll->pll_base + ctrl->ndiv_int.offset);
+
+	/* program fractional part of NDIV */
+	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
+		val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
+		val &= ~(bit_mask(ctrl->ndiv_frac.width) <<
+				ctrl->ndiv_frac.shift);
+		val |= vco->ndiv_frac << ctrl->ndiv_frac.shift;
+		writel(val, pll->pll_base + ctrl->ndiv_frac.offset);
+	}
+
+	/* program PDIV */
+	val = readl(pll->pll_base + ctrl->pdiv.offset);
+	val &= ~(bit_mask(ctrl->pdiv.width) << ctrl->pdiv.shift);
+	val |= vco->pdiv << ctrl->pdiv.shift;
+	writel(val, pll->pll_base + ctrl->pdiv.offset);
+
+	__pll_bring_out_reset(pll, kp, ka, ki);
+
+	ret = pll_wait_for_lock(pll);
+	if (ret < 0) {
+		pr_err("%s: pll: %s failed to lock\n", __func__, pll->name);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int iproc_pll_enable(struct clk_hw *hw)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+
+	return __pll_enable(pll);
+}
+
+static void iproc_pll_disable(struct clk_hw *hw)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+
+	if (ctrl->flags & IPROC_CLK_AON)
+		return;
+
+	__pll_disable(pll);
+}
+
+static unsigned long iproc_pll_recalc_rate(struct clk_hw *hw,
+	unsigned long parent_rate)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+	u64 ndiv;
+	unsigned int ndiv_int, ndiv_frac, pdiv;
+
+	if (parent_rate == 0)
+		return 0;
+
+	/* PLL needs to be locked */
+	val = readl(pll->pll_base + ctrl->status.offset);
+	if ((val & (1 << ctrl->status.shift)) == 0) {
+		pll->rate = 0;
+		return 0;
+	}
+
+	/*
+	 * PLL output frequency =
+	 *
+	 * ((ndiv_int + ndiv_frac / 2^20) * (parent clock rate / pdiv)
+	 */
+	val = readl(pll->pll_base + ctrl->ndiv_int.offset);
+	ndiv_int = (val >> ctrl->ndiv_int.shift) &
+		bit_mask(ctrl->ndiv_int.width);
+	ndiv = ndiv_int << ctrl->ndiv_int.shift;
+
+	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
+		val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
+		ndiv_frac = (val >> ctrl->ndiv_frac.shift) &
+			bit_mask(ctrl->ndiv_frac.width);
+
+		if (ndiv_frac != 0)
+			ndiv = (ndiv_int << ctrl->ndiv_int.shift) | ndiv_frac;
+	}
+
+	val = readl(pll->pll_base + ctrl->pdiv.offset);
+	pdiv = (val >> ctrl->pdiv.shift) & bit_mask(ctrl->pdiv.width);
+
+	pll->rate = (ndiv * parent_rate) >> ctrl->ndiv_int.shift;
+
+	if (pdiv == 0)
+		pll->rate *= 2;
+	else
+		pll->rate /= pdiv;
+
+	return pll->rate;
+}
+
+static const struct clk_ops iproc_pll_ops = {
+	.enable = iproc_pll_enable,
+	.disable = iproc_pll_disable,
+	.recalc_rate = iproc_pll_recalc_rate,
+};
+
+void __init iproc_pll_setup(struct device_node *node,
+		const struct iproc_pll_ctrl *ctrl,
+		const struct iproc_pll_vco_freq_param *vco_param,
+		unsigned int num_vco_entries)
+{
+	int ret;
+	struct clk *clk;
+	struct iproc_pll *pll;
+	struct clk_init_data init;
+	const char *parent_name;
+	unsigned int rate;
+
+	if (WARN_ON(!ctrl))
+		return;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->pll_base = of_iomap(node, 0);
+	if (WARN_ON(!pll->pll_base))
+		goto err_pll_iomap;
+
+	pll->pwr_base = of_iomap(node, 1);
+	if (WARN_ON(!pll->pwr_base))
+		goto err_pwr_iomap;
+
+	/* some PLLs require gating control at the top ASIU level */
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		pll->asiu_base = of_iomap(node, 2);
+		if (WARN_ON(!pll->asiu_base))
+			goto err_asiu_iomap;
+	}
+
+	pll->ctrl = ctrl;
+	pll->name = node->name;
+	init.name = node->name;
+	init.ops = &iproc_pll_ops;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	pll->hw.init = &init;
+
+	/* configure the PLL to the desired VCO frequency if specified */
+	ret = of_property_read_u32(node, "clock-frequency", &rate);
+	if (!ret) {
+		unsigned long parent_rate;
+		int rate_index;
+
+		if (WARN_ON(!vco_param))
+			goto err_clk_register;
+
+		pll->num_vco_entries = num_vco_entries;
+		pll->vco_param = vco_param;
+
+		parent_rate = __get_rate(parent_name);
+		if (WARN_ON(!parent_rate))
+			goto err_clk_register;
+
+		rate_index = pll_get_rate_index(pll, rate);
+		if (WARN_ON(rate_index < 0))
+			goto err_clk_register;
+
+		ret = pll_set_rate(pll, rate_index, parent_rate);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+	}
+
+	clk = clk_register(NULL, &pll->hw);
+	if (WARN_ON(IS_ERR(clk)))
+		goto err_clk_register;
+
+	pll->clk_data.clk_num = 1;
+	pll->clk_data.clks = &clk;
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get,
+			&pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_add;
+
+	return;
+
+err_clk_add:
+	clk_unregister(clk);
+err_clk_register:
+	if (pll->asiu_base)
+		iounmap(pll->asiu_base);
+err_asiu_iomap:
+	iounmap(pll->pwr_base);
+err_pwr_iomap:
+	iounmap(pll->pll_base);
+err_pll_iomap:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc.h b/drivers/clk/bcm/clk-iproc.h
new file mode 100644
index 0000000..4aa0479
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc.h
@@ -0,0 +1,155 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _CLK_IPROC_H
+#define _CLK_IPROC_H
+
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/of.h>
+#include <linux/clk-provider.h>
+
+#define IPROC_CLK_NAME_LEN 25
+#define IPROC_CLK_INVALID_OFFSET 0xffffffff
+#define bit_mask(width) ((1 << (width)) - 1)
+
+/* clock should not be disabled at runtime */
+#define IPROC_CLK_AON BIT(0)
+
+/* PLL requires gating through ASIU */
+#define IPROC_CLK_PLL_ASIU BIT(1)
+
+/* PLL has fractional part of the NDIV */
+#define IPROC_CLK_PLL_HAS_NDIV_FRAC BIT(2)
+
+/*
+ * Parameters for VCO frequency configuration
+ *
+ * VCO frequency =
+ * ((ndiv_int + ndiv_frac / 2^20) * (ref freqeuncy  / pdiv)
+ */
+struct iproc_pll_vco_freq_param {
+	unsigned long rate;
+	unsigned int ndiv_int;
+	unsigned int ndiv_frac;
+	unsigned int pdiv;
+};
+
+struct iproc_clk_reg_op {
+	unsigned int offset;
+	unsigned int shift;
+	unsigned int width;
+};
+
+/*
+ * Clock gating control@the top ASIU level
+ */
+struct iproc_asiu_gate {
+	unsigned int offset;
+	unsigned int en_shift;
+};
+
+/*
+ * Control of powering on/off of a PLL
+ *
+ * Before powering off a PLL, input isolation (ISO) needs to be enabled
+ */
+struct iproc_pll_aon_pwr_ctrl {
+	unsigned int offset;
+	unsigned int pwr_width;
+	unsigned int pwr_shift;
+	unsigned int iso_shift;
+};
+
+/*
+ * Control of the PLL reset, with Ki, Kp, and Ka parameters
+ */
+struct iproc_pll_reset_ctrl {
+	unsigned int offset;
+	unsigned int reset_shift;
+	unsigned int p_reset_shift;
+	unsigned int ki_shift;
+	unsigned int ki_width;
+	unsigned int kp_shift;
+	unsigned int kp_width;
+	unsigned int ka_shift;
+	unsigned int ka_width;
+};
+
+struct iproc_pll_vco_ctrl {
+	unsigned int u_offset;
+	unsigned int l_offset;
+};
+
+/*
+ * Main PLL control parameters
+ */
+struct iproc_pll_ctrl {
+	unsigned long flags;
+	struct iproc_pll_aon_pwr_ctrl aon;
+	struct iproc_asiu_gate asiu;
+	struct iproc_pll_reset_ctrl reset;
+	struct iproc_clk_reg_op ndiv_int;
+	struct iproc_clk_reg_op ndiv_frac;
+	struct iproc_clk_reg_op pdiv;
+	struct iproc_pll_vco_ctrl vco_ctrl;
+	struct iproc_clk_reg_op status;
+};
+
+/*
+ * Controls enabling/disabling a PLL derived clock
+ */
+struct iproc_clk_enable_ctrl {
+	unsigned int offset;
+	unsigned int enable_shift;
+	unsigned int hold_shift;
+	unsigned int bypass_shift;
+};
+
+/*
+ * Main clock control parameters for clocks derived from the PLLs
+ */
+struct iproc_clk_ctrl {
+	unsigned int channel;
+	unsigned long flags;
+	struct iproc_clk_enable_ctrl enable;
+	struct iproc_clk_reg_op mdiv;
+};
+
+/*
+ * Divisor of the ASIU clocks
+ */
+struct iproc_asiu_div {
+	unsigned int offset;
+	unsigned int en_shift;
+	unsigned int high_shift;
+	unsigned int high_width;
+	unsigned int low_shift;
+	unsigned int low_width;
+};
+
+extern void __init iproc_armpll_setup(struct device_node *node);
+extern void __init iproc_pll_setup(struct device_node *node,
+		const struct iproc_pll_ctrl *ctrl,
+		const struct iproc_pll_vco_freq_param *vco_param,
+		unsigned int num_freqs);
+extern void __init iproc_clk_setup(struct device_node *node,
+		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks);
+extern void __init iproc_asiu_setup(struct device_node *node,
+		const struct iproc_asiu_div *div,
+		const struct iproc_asiu_gate *gate, unsigned int num_clks);
+
+#endif /* _CLK_IPROC_H */
-- 
1.7.9.5

[PATCH 3/4] clk: cygnus: add clock support for Broadcom Cygnus

[Ray Jui]

The Broadcom Cygnus SoC is architected under the iProc architecture. It
has the following PLLs: ARMPLL, GENPLL, LCPLL0, MIPIPLL, all dervied
from an onboard crystal. Cygnus also has various ASIU clocks that are
derived directly from the onboard crystal.

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/clk/bcm/Makefile               |    1 +
 drivers/clk/bcm/clk-cygnus.c           |  277 ++++++++++++++++++++++++++++++++
 include/dt-bindings/clock/bcm-cygnus.h |   77 +++++++++
 3 files changed, 355 insertions(+)
 create mode 100644 drivers/clk/bcm/clk-cygnus.c
 create mode 100644 include/dt-bindings/clock/bcm-cygnus.h

diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
index 6926636..afcbe55 100644
--- a/drivers/clk/bcm/Makefile
+++ b/drivers/clk/bcm/Makefile
@@ -3,3 +3,4 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
 obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
+obj-$(CONFIG_ARCH_BCM_CYGNUS)	+= clk-cygnus.o
diff --git a/drivers/clk/bcm/clk-cygnus.c b/drivers/clk/bcm/clk-cygnus.c
new file mode 100644
index 0000000..f603d1d
--- /dev/null
+++ b/drivers/clk/bcm/clk-cygnus.c
@@ -0,0 +1,277 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include <dt-bindings/clock/bcm-cygnus.h>
+#include "clk-iproc.h"
+
+#define reg_val(o, s, w) { .offset = o, .shift = s, .width = w, }
+
+#define aon_val(o, pw, ps, is) { .offset = o, .pwr_width = pw, \
+	.pwr_shift = ps, .iso_shift = is }
+
+#define asiu_div_val(o, es, hs, hw, ls, lw) \
+		{ .offset = o, .en_shift = es, .high_shift = hs, \
+		.high_width = hw, .low_shift = ls, .low_width = lw }
+
+#define reset_val(o, rs, prs, kis, kiw, kps, kpw, kas, kaw) { .offset = o, \
+	.reset_shift = rs, .p_reset_shift = prs, .ki_shift = kis, \
+	.ki_width = kiw, .kp_shift = kps, .kp_width = kpw, .ka_shift = kas, \
+	.ka_width = kaw }
+
+#define vco_ctrl_val(uo, lo) { .u_offset = uo, .l_offset = lo }
+
+#define enable_val(o, es, hs, bs) { .offset = o, .enable_shift = es, \
+	.hold_shift = hs, .bypass_shift = bs }
+
+#define asiu_gate_val(o, es) { .offset = o, .en_shift = es }
+
+static const struct iproc_pll_ctrl genpll = {
+	.flags = IPROC_CLK_AON | IPROC_CLK_PLL_HAS_NDIV_FRAC,
+	.aon = aon_val(0x0, 2, 1, 0),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 3),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static const struct iproc_pll_ctrl lcpll0 = {
+	.flags = IPROC_CLK_AON,
+	.aon = aon_val(0x0, 2, 5, 4),
+	.reset = reset_val(0x0, 31, 30, 27, 3, 23, 4, 19, 4),
+	.ndiv_int = reg_val(0x4, 16, 10),
+	.pdiv = reg_val(0x4, 26, 4),
+	.vco_ctrl = vco_ctrl_val(0x10, 0x14),
+	.status = reg_val(0x18, 12, 1),
+};
+
+/*
+ * MIPI PLL VCO frequency parameter table
+ */
+static const struct iproc_pll_vco_freq_param mipipll_vco_params[] = {
+	/* rate (Hz) ndiv_int ndiv_frac pdiv */
+	{ 750000000UL,   30,     0,        1 },
+	{ 1000000000UL,  40,     0,        1 },
+	{ 1350000000ul,  54,     0,        1 },
+	{ 2000000000UL,  80,     0,        1 },
+	{ 2100000000UL,  84,     0,        1 },
+	{ 2250000000UL,  90,     0,        1 },
+	{ 2500000000UL,  100,    0,        1 },
+	{ 2700000000UL,  54,     0,        0 },
+	{ 2975000000UL,  119,    0,        1 },
+	{ 3100000000UL,  124,    0,        1 },
+	{ 3150000000UL,  126,    0,        1 },
+};
+
+static const struct iproc_pll_ctrl mipipll = {
+	.flags = IPROC_CLK_PLL_ASIU | IPROC_CLK_PLL_HAS_NDIV_FRAC,
+	.aon = aon_val(0x0, 4, 17, 16),
+	.asiu = asiu_gate_val(0x0, 3),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 4),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static const struct iproc_clk_ctrl genpll_clk[BCM_CYGNUS_NUM_GENPLL_CLKS] = {
+	[BCM_CYGNUS_GENPLL_AXI21_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AXI21_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 6, 0, 12),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_250MHZ_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_250MHZ_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 7, 1, 13),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_IHOST_SYS_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_IHOST_SYS_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 8, 2, 14),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_GENPLL_ENET_SW_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_ENET_SW_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 9, 3, 15),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_AUDIO_125_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AUDIO_125_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 10, 4, 16),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_CAN_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_CAN_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 11, 5, 17),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static const struct iproc_clk_ctrl lcpll0_clk[BCM_CYGNUS_NUM_LCPLL0_CLKS] = {
+	[BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 7, 1, 13),
+		.mdiv = reg_val(0x8, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_DDR_PHY_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_DDR_PHY_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 8, 2, 14),
+		.mdiv = reg_val(0x8, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SDIO_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SDIO_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 9, 3, 15),
+		.mdiv = reg_val(0x8, 20, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 10, 4, 16),
+		.mdiv = reg_val(0xc, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SMART_CARD_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SMART_CARD_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 11, 5, 17),
+		.mdiv = reg_val(0xc, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_LCPLL0_CH5_UNUSED,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 12, 6, 18),
+		.mdiv = reg_val(0xc, 20, 8),
+	},
+};
+
+static const struct iproc_clk_ctrl mipipll_clk[BCM_CYGNUS_NUM_MIPIPLL_CLKS] = {
+	[BCM_CYGNUS_MIPIPLL_CH0_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH0_UNUSED,
+		.enable = enable_val(0x4, 12, 6, 18),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH1_LCD] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH1_LCD,
+		.enable = enable_val(0x4, 13, 7, 19),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH2_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH2_UNUSED,
+		.enable = enable_val(0x4, 14, 8, 20),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH3_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH3_UNUSED,
+		.enable = enable_val(0x4, 15, 9, 21),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH4_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH4_UNUSED,
+		.enable = enable_val(0x4, 16, 10, 22),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH5_UNUSED,
+		.enable = enable_val(0x4, 17, 11, 23),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static const struct iproc_asiu_div asiu_div[BCM_CYGNUS_NUM_ASIU_CLKS] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
+		asiu_div_val(0x0, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_ADC_CLK] =
+		asiu_div_val(0x4, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_PWM_CLK] =
+		asiu_div_val(0x8, 31, 16, 10, 0, 10),
+};
+
+static const struct iproc_asiu_gate asiu_gate[BCM_CYGNUS_NUM_ASIU_CLKS] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
+		asiu_gate_val(0x0, 7),
+	[BCM_CYGNUS_ASIU_ADC_CLK] =
+		asiu_gate_val(0x0, 9),
+	[BCM_CYGNUS_ASIU_PWM_CLK] =
+		asiu_gate_val(IPROC_CLK_INVALID_OFFSET, 0),
+};
+
+static void __init cygnus_armpll_init(struct device_node *node)
+{
+	iproc_armpll_setup(node);
+}
+CLK_OF_DECLARE(cygnus_armpll, "brcm,cygnus-armpll", cygnus_armpll_init);
+
+static void __init cygnus_genpll_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &genpll, NULL, 0);
+}
+CLK_OF_DECLARE(cygnus_genpll, "brcm,cygnus-genpll", cygnus_genpll_init);
+
+static void __init cygnus_lcpll0_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &lcpll0, NULL, 0);
+}
+CLK_OF_DECLARE(cygnus_lcpll0, "brcm,cygnus-lcpll0", cygnus_lcpll0_init);
+
+static void __init cygnus_mipipll_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &mipipll, mipipll_vco_params,
+			ARRAY_SIZE(mipipll_vco_params));
+}
+CLK_OF_DECLARE(cygnus_mipipll, "brcm,cygnus-mipipll", cygnus_mipipll_init);
+
+static void __init cygnus_genpll_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, genpll_clk, BCM_CYGNUS_NUM_GENPLL_CLKS);
+}
+CLK_OF_DECLARE(cygnus_genpll_clk, "brcm,cygnus-genpll-clk",
+		cygnus_genpll_clk_init);
+
+static void __init cygnus_lcpll0_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, lcpll0_clk, BCM_CYGNUS_NUM_LCPLL0_CLKS);
+}
+CLK_OF_DECLARE(cygnus_lcpll0_clk, "brcm,cygnus-lcpll0-clk",
+		cygnus_lcpll0_clk_init);
+
+static void __init cygnus_mipipll_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, mipipll_clk, BCM_CYGNUS_NUM_MIPIPLL_CLKS);
+}
+CLK_OF_DECLARE(cygnus_mipipll_clk, "brcm,cygnus-mipipll-clk",
+		cygnus_mipipll_clk_init);
+
+static void __init cygnus_asiu_init(struct device_node *node)
+{
+	iproc_asiu_setup(node, asiu_div, asiu_gate, BCM_CYGNUS_NUM_ASIU_CLKS);
+}
+CLK_OF_DECLARE(cygnus_asiu_clk, "brcm,cygnus-asiu-clk", cygnus_asiu_init);
diff --git a/include/dt-bindings/clock/bcm-cygnus.h b/include/dt-bindings/clock/bcm-cygnus.h
new file mode 100644
index 0000000..45948b6
--- /dev/null
+++ b/include/dt-bindings/clock/bcm-cygnus.h
@@ -0,0 +1,77 @@
+/*
+ *  BSD LICENSE
+ *
+ *  Copyright(c) 2014 Broadcom Corporation.  All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in
+ *      the documentation and/or other materials provided with the
+ *      distribution.
+ *    * Neither the name of Broadcom Corporation nor the names of its
+ *      contributors may be used to endorse or promote products derived
+ *      from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _CLOCK_BCM_CYGNUS_H
+#define _CLOCK_BCM_CYGNUS_H
+
+/* number of GENPLL clocks */
+#define BCM_CYGNUS_NUM_GENPLL_CLKS 6
+
+/* GENPLL clock channel ID */
+#define BCM_CYGNUS_GENPLL_AXI21_CLK          0
+#define BCM_CYGNUS_GENPLL_250MHZ_CLK         1
+#define BCM_CYGNUS_GENPLL_IHOST_SYS_CLK      2
+#define BCM_CYGNUS_GENPLL_ENET_SW_CLK        3
+#define BCM_CYGNUS_GENPLL_AUDIO_125_CLK      4
+#define BCM_CYGNUS_GENPLL_CAN_CLK            5
+
+/* number of LCPLL0 clocks */
+#define BCM_CYGNUS_NUM_LCPLL0_CLKS 6
+
+/* LCPLL0 clock channel ID */
+#define BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK    0
+#define BCM_CYGNUS_LCPLL0_DDR_PHY_CLK         1
+#define BCM_CYGNUS_LCPLL0_SDIO_CLK            2
+#define BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK     3
+#define BCM_CYGNUS_LCPLL0_SMART_CARD_CLK      4
+#define BCM_CYGNUS_LCPLL0_CH5_UNUSED          5
+
+/* number of MIPI PLL clocks */
+#define BCM_CYGNUS_NUM_MIPIPLL_CLKS 6
+
+/* MIPI PLL clock channel ID */
+#define BCM_CYGNUS_MIPIPLL_CH0_UNUSED         0
+#define BCM_CYGNUS_MIPIPLL_CH1_LCD            1
+#define BCM_CYGNUS_MIPIPLL_CH2_UNUSED         2
+#define BCM_CYGNUS_MIPIPLL_CH3_UNUSED         3
+#define BCM_CYGNUS_MIPIPLL_CH4_UNUSED         4
+#define BCM_CYGNUS_MIPIPLL_CH5_UNUSED         5
+
+/* number of ASIU clocks */
+#define BCM_CYGNUS_NUM_ASIU_CLKS 3
+
+/* ASIU clock IDs */
+#define BCM_CYGNUS_ASIU_KEYPAD_CLK    0
+#define BCM_CYGNUS_ASIU_ADC_CLK       1
+#define BCM_CYGNUS_ASIU_PWM_CLK       2
+
+#endif /* _CLOCK_BCM_CYGNUS_H */
-- 
1.7.9.5

[PATCH 3/4] clk: cygnus: add clock support for Broadcom Cygnus

[Ray Jui]

The Broadcom Cygnus SoC is architected under the iProc architecture. It
has the following PLLs: ARMPLL, GENPLL, LCPLL0, MIPIPLL, all dervied
from an onboard crystal. Cygnus also has various ASIU clocks that are
derived directly from the onboard crystal.

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/clk/bcm/Makefile               |    1 +
 drivers/clk/bcm/clk-cygnus.c           |  277 ++++++++++++++++++++++++++++++++
 include/dt-bindings/clock/bcm-cygnus.h |   77 +++++++++
 3 files changed, 355 insertions(+)
 create mode 100644 drivers/clk/bcm/clk-cygnus.c
 create mode 100644 include/dt-bindings/clock/bcm-cygnus.h

diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
index 6926636..afcbe55 100644
--- a/drivers/clk/bcm/Makefile
+++ b/drivers/clk/bcm/Makefile
@@ -3,3 +3,4 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
 obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
+obj-$(CONFIG_ARCH_BCM_CYGNUS)	+= clk-cygnus.o
diff --git a/drivers/clk/bcm/clk-cygnus.c b/drivers/clk/bcm/clk-cygnus.c
new file mode 100644
index 0000000..f603d1d
--- /dev/null
+++ b/drivers/clk/bcm/clk-cygnus.c
@@ -0,0 +1,277 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include <dt-bindings/clock/bcm-cygnus.h>
+#include "clk-iproc.h"
+
+#define reg_val(o, s, w) { .offset = o, .shift = s, .width = w, }
+
+#define aon_val(o, pw, ps, is) { .offset = o, .pwr_width = pw, \
+	.pwr_shift = ps, .iso_shift = is }
+
+#define asiu_div_val(o, es, hs, hw, ls, lw) \
+		{ .offset = o, .en_shift = es, .high_shift = hs, \
+		.high_width = hw, .low_shift = ls, .low_width = lw }
+
+#define reset_val(o, rs, prs, kis, kiw, kps, kpw, kas, kaw) { .offset = o, \
+	.reset_shift = rs, .p_reset_shift = prs, .ki_shift = kis, \
+	.ki_width = kiw, .kp_shift = kps, .kp_width = kpw, .ka_shift = kas, \
+	.ka_width = kaw }
+
+#define vco_ctrl_val(uo, lo) { .u_offset = uo, .l_offset = lo }
+
+#define enable_val(o, es, hs, bs) { .offset = o, .enable_shift = es, \
+	.hold_shift = hs, .bypass_shift = bs }
+
+#define asiu_gate_val(o, es) { .offset = o, .en_shift = es }
+
+static const struct iproc_pll_ctrl genpll = {
+	.flags = IPROC_CLK_AON | IPROC_CLK_PLL_HAS_NDIV_FRAC,
+	.aon = aon_val(0x0, 2, 1, 0),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 3),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static const struct iproc_pll_ctrl lcpll0 = {
+	.flags = IPROC_CLK_AON,
+	.aon = aon_val(0x0, 2, 5, 4),
+	.reset = reset_val(0x0, 31, 30, 27, 3, 23, 4, 19, 4),
+	.ndiv_int = reg_val(0x4, 16, 10),
+	.pdiv = reg_val(0x4, 26, 4),
+	.vco_ctrl = vco_ctrl_val(0x10, 0x14),
+	.status = reg_val(0x18, 12, 1),
+};
+
+/*
+ * MIPI PLL VCO frequency parameter table
+ */
+static const struct iproc_pll_vco_freq_param mipipll_vco_params[] = {
+	/* rate (Hz) ndiv_int ndiv_frac pdiv */
+	{ 750000000UL,   30,     0,        1 },
+	{ 1000000000UL,  40,     0,        1 },
+	{ 1350000000ul,  54,     0,        1 },
+	{ 2000000000UL,  80,     0,        1 },
+	{ 2100000000UL,  84,     0,        1 },
+	{ 2250000000UL,  90,     0,        1 },
+	{ 2500000000UL,  100,    0,        1 },
+	{ 2700000000UL,  54,     0,        0 },
+	{ 2975000000UL,  119,    0,        1 },
+	{ 3100000000UL,  124,    0,        1 },
+	{ 3150000000UL,  126,    0,        1 },
+};
+
+static const struct iproc_pll_ctrl mipipll = {
+	.flags = IPROC_CLK_PLL_ASIU | IPROC_CLK_PLL_HAS_NDIV_FRAC,
+	.aon = aon_val(0x0, 4, 17, 16),
+	.asiu = asiu_gate_val(0x0, 3),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 4),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static const struct iproc_clk_ctrl genpll_clk[BCM_CYGNUS_NUM_GENPLL_CLKS] = {
+	[BCM_CYGNUS_GENPLL_AXI21_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AXI21_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 6, 0, 12),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_250MHZ_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_250MHZ_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 7, 1, 13),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_IHOST_SYS_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_IHOST_SYS_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 8, 2, 14),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_GENPLL_ENET_SW_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_ENET_SW_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 9, 3, 15),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_AUDIO_125_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AUDIO_125_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 10, 4, 16),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_CAN_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_CAN_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 11, 5, 17),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static const struct iproc_clk_ctrl lcpll0_clk[BCM_CYGNUS_NUM_LCPLL0_CLKS] = {
+	[BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 7, 1, 13),
+		.mdiv = reg_val(0x8, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_DDR_PHY_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_DDR_PHY_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 8, 2, 14),
+		.mdiv = reg_val(0x8, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SDIO_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SDIO_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 9, 3, 15),
+		.mdiv = reg_val(0x8, 20, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 10, 4, 16),
+		.mdiv = reg_val(0xc, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SMART_CARD_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SMART_CARD_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 11, 5, 17),
+		.mdiv = reg_val(0xc, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_LCPLL0_CH5_UNUSED,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 12, 6, 18),
+		.mdiv = reg_val(0xc, 20, 8),
+	},
+};
+
+static const struct iproc_clk_ctrl mipipll_clk[BCM_CYGNUS_NUM_MIPIPLL_CLKS] = {
+	[BCM_CYGNUS_MIPIPLL_CH0_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH0_UNUSED,
+		.enable = enable_val(0x4, 12, 6, 18),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH1_LCD] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH1_LCD,
+		.enable = enable_val(0x4, 13, 7, 19),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH2_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH2_UNUSED,
+		.enable = enable_val(0x4, 14, 8, 20),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH3_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH3_UNUSED,
+		.enable = enable_val(0x4, 15, 9, 21),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH4_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH4_UNUSED,
+		.enable = enable_val(0x4, 16, 10, 22),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH5_UNUSED,
+		.enable = enable_val(0x4, 17, 11, 23),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static const struct iproc_asiu_div asiu_div[BCM_CYGNUS_NUM_ASIU_CLKS] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
+		asiu_div_val(0x0, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_ADC_CLK] =
+		asiu_div_val(0x4, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_PWM_CLK] =
+		asiu_div_val(0x8, 31, 16, 10, 0, 10),
+};
+
+static const struct iproc_asiu_gate asiu_gate[BCM_CYGNUS_NUM_ASIU_CLKS] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
+		asiu_gate_val(0x0, 7),
+	[BCM_CYGNUS_ASIU_ADC_CLK] =
+		asiu_gate_val(0x0, 9),
+	[BCM_CYGNUS_ASIU_PWM_CLK] =
+		asiu_gate_val(IPROC_CLK_INVALID_OFFSET, 0),
+};
+
+static void __init cygnus_armpll_init(struct device_node *node)
+{
+	iproc_armpll_setup(node);
+}
+CLK_OF_DECLARE(cygnus_armpll, "brcm,cygnus-armpll", cygnus_armpll_init);
+
+static void __init cygnus_genpll_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &genpll, NULL, 0);
+}
+CLK_OF_DECLARE(cygnus_genpll, "brcm,cygnus-genpll", cygnus_genpll_init);
+
+static void __init cygnus_lcpll0_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &lcpll0, NULL, 0);
+}
+CLK_OF_DECLARE(cygnus_lcpll0, "brcm,cygnus-lcpll0", cygnus_lcpll0_init);
+
+static void __init cygnus_mipipll_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &mipipll, mipipll_vco_params,
+			ARRAY_SIZE(mipipll_vco_params));
+}
+CLK_OF_DECLARE(cygnus_mipipll, "brcm,cygnus-mipipll", cygnus_mipipll_init);
+
+static void __init cygnus_genpll_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, genpll_clk, BCM_CYGNUS_NUM_GENPLL_CLKS);
+}
+CLK_OF_DECLARE(cygnus_genpll_clk, "brcm,cygnus-genpll-clk",
+		cygnus_genpll_clk_init);
+
+static void __init cygnus_lcpll0_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, lcpll0_clk, BCM_CYGNUS_NUM_LCPLL0_CLKS);
+}
+CLK_OF_DECLARE(cygnus_lcpll0_clk, "brcm,cygnus-lcpll0-clk",
+		cygnus_lcpll0_clk_init);
+
+static void __init cygnus_mipipll_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, mipipll_clk, BCM_CYGNUS_NUM_MIPIPLL_CLKS);
+}
+CLK_OF_DECLARE(cygnus_mipipll_clk, "brcm,cygnus-mipipll-clk",
+		cygnus_mipipll_clk_init);
+
+static void __init cygnus_asiu_init(struct device_node *node)
+{
+	iproc_asiu_setup(node, asiu_div, asiu_gate, BCM_CYGNUS_NUM_ASIU_CLKS);
+}
+CLK_OF_DECLARE(cygnus_asiu_clk, "brcm,cygnus-asiu-clk", cygnus_asiu_init);
diff --git a/include/dt-bindings/clock/bcm-cygnus.h b/include/dt-bindings/clock/bcm-cygnus.h
new file mode 100644
index 0000000..45948b6
--- /dev/null
+++ b/include/dt-bindings/clock/bcm-cygnus.h
@@ -0,0 +1,77 @@
+/*
+ *  BSD LICENSE
+ *
+ *  Copyright(c) 2014 Broadcom Corporation.  All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in
+ *      the documentation and/or other materials provided with the
+ *      distribution.
+ *    * Neither the name of Broadcom Corporation nor the names of its
+ *      contributors may be used to endorse or promote products derived
+ *      from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _CLOCK_BCM_CYGNUS_H
+#define _CLOCK_BCM_CYGNUS_H
+
+/* number of GENPLL clocks */
+#define BCM_CYGNUS_NUM_GENPLL_CLKS 6
+
+/* GENPLL clock channel ID */
+#define BCM_CYGNUS_GENPLL_AXI21_CLK          0
+#define BCM_CYGNUS_GENPLL_250MHZ_CLK         1
+#define BCM_CYGNUS_GENPLL_IHOST_SYS_CLK      2
+#define BCM_CYGNUS_GENPLL_ENET_SW_CLK        3
+#define BCM_CYGNUS_GENPLL_AUDIO_125_CLK      4
+#define BCM_CYGNUS_GENPLL_CAN_CLK            5
+
+/* number of LCPLL0 clocks */
+#define BCM_CYGNUS_NUM_LCPLL0_CLKS 6
+
+/* LCPLL0 clock channel ID */
+#define BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK    0
+#define BCM_CYGNUS_LCPLL0_DDR_PHY_CLK         1
+#define BCM_CYGNUS_LCPLL0_SDIO_CLK            2
+#define BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK     3
+#define BCM_CYGNUS_LCPLL0_SMART_CARD_CLK      4
+#define BCM_CYGNUS_LCPLL0_CH5_UNUSED          5
+
+/* number of MIPI PLL clocks */
+#define BCM_CYGNUS_NUM_MIPIPLL_CLKS 6
+
+/* MIPI PLL clock channel ID */
+#define BCM_CYGNUS_MIPIPLL_CH0_UNUSED         0
+#define BCM_CYGNUS_MIPIPLL_CH1_LCD            1
+#define BCM_CYGNUS_MIPIPLL_CH2_UNUSED         2
+#define BCM_CYGNUS_MIPIPLL_CH3_UNUSED         3
+#define BCM_CYGNUS_MIPIPLL_CH4_UNUSED         4
+#define BCM_CYGNUS_MIPIPLL_CH5_UNUSED         5
+
+/* number of ASIU clocks */
+#define BCM_CYGNUS_NUM_ASIU_CLKS 3
+
+/* ASIU clock IDs */
+#define BCM_CYGNUS_ASIU_KEYPAD_CLK    0
+#define BCM_CYGNUS_ASIU_ADC_CLK       1
+#define BCM_CYGNUS_ASIU_PWM_CLK       2
+
+#endif /* _CLOCK_BCM_CYGNUS_H */
-- 
1.7.9.5

[PATCH 4/4] ARM: dts: enable clock support for Broadcom Cygnus

[Ray Jui]

Replace current device tree dummy clocks with real clock support for
Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbraden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus-clock.dtsi |  110 ++++++++++++++++++++++++-------
 arch/arm/boot/dts/bcm-cygnus.dtsi       |    2 +-
 2 files changed, 86 insertions(+), 26 deletions(-)

diff --git a/arch/arm/boot/dts/bcm-cygnus-clock.dtsi b/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
index 60d8389..f2da5e2 100644
--- a/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
@@ -36,56 +36,116 @@ clocks {
 	ranges;
 
 	osc: oscillator {
+		#clock-cells = <0>;
 		compatible = "fixed-clock";
-		#clock-cells = <1>;
 		clock-frequency = <25000000>;
 	};
 
-	apb_clk: apb_clk {
-		compatible = "fixed-clock";
+	/* Cygnus ARM PLL */
+	armpll: armpll {
 		#clock-cells = <0>;
-		clock-frequency = <1000000000>;
+		compatible = "brcm,cygnus-armpll";
+		clocks = <&osc>;
+		reg = <0x19000000 0x1000>;
 	};
 
-	periph_clk: periph_clk {
-		compatible = "fixed-clock";
+	/* peripheral clock for system timer */
+	arm_periph_clk: arm_periph_clk {
 		#clock-cells = <0>;
-		clock-frequency = <500000000>;
+		compatible = "fixed-factor-clock";
+		clocks = <&armpll>;
+		clock-div = <2>;
+		clock-mult = <1>;
 	};
 
-	sdio_clk: lcpll_ch2 {
-		compatible = "fixed-clock";
+	/* APB bus clock */
+	apb_clk: apb_clk {
 		#clock-cells = <0>;
-		clock-frequency = <200000000>;
+		compatible = "fixed-factor-clock";
+		clocks = <&armpll>;
+		clock-div = <4>;
+		clock-mult = <1>;
 	};
 
-	axi81_clk: axi81_clk {
-		compatible = "fixed-clock";
+	genpll: genpll {
 		#clock-cells = <0>;
-		clock-frequency = <100000000>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
 	};
 
-	keypad_clk: keypad_clk {
-		compatible = "fixed-clock";
+	/* various clocks running off the GENPLL */
+	genpll_clks: genpll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-genpll-clk";
+		reg = <0x0301d000 0x2c>;
+		clocks = <&genpll>;
+		clock-output-names = "axi21", "250mhz", "ihost_sys",
+			"enet_sw", "audio_125", "can";
+	};
+
+	/* always 1/2 of the axi21 clock */
+	axi41_clk: axi41_clk {
 		#clock-cells = <0>;
-		clock-frequency = <31806>;
+		compatible = "fixed-factor-clock";
+		clocks = <&genpll_clks 0>;
+		clock-div = <2>;
+		clock-mult = <1>;
 	};
 
-	adc_clk: adc_clk {
-		compatible = "fixed-clock";
+	/* always 1/4 of the axi21 clock */
+	axi81_clk: axi81_clk {
 		#clock-cells = <0>;
-		clock-frequency = <1562500>;
+		compatible = "fixed-factor-clock";
+		clocks = <&genpll_clks 0>;
+		clock-div = <4>;
+		clock-mult = <1>;
 	};
 
-	pwm_clk: pwm_clk {
-		compatible = "fixed-clock";
+	lcpll0: lcpll0 {
 		#clock-cells = <0>;
-		clock-frequency = <1000000>;
+		compatible = "brcm,cygnus-lcpll0";
+		reg = <0x0301d02c 0x1c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
 	};
 
-	lcd_clk: mipipll_ch1 {
-		compatible = "fixed-clock";
+	/* various clocks running off the LCPLL0 */
+	lcpll0_clks: lcpll0_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-lcpll0-clk";
+		reg = <0x0301d02c 0x1c>;
+		clocks = <&lcpll0>;
+		clock-output-names = "pcie_phy", "ddr_phy", "sdio",
+			"usb_phy", "smart_card", "ch5";
+	};
+
+	mipipll: mipipll {
 		#clock-cells = <0>;
-		clock-frequency = <100000000>;
+		compatible = "brcm,cygnus-mipipll";
+		reg = <0x180a9800 0x2c>,
+			<0x0301c020 0x4>,
+			<0x180aa024 0x4>;
+		clock-frequency = <1350000000>;
+		clocks = <&osc>;
+	};
+
+	mipipll_clks: mipipll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-mipipll-clk";
+		reg = <0x180a9800 0x2c>;
+		clocks = <&mipipll>;
+		clock-output-names = "ch0_unused", "ch1_lcd", "ch2_unused",
+			"ch3_unused", "ch4_unused", "ch5_unused";
+	};
+
+	asiu_clks: asiu_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-asiu-clk";
+		reg = <0x0301d048 0xc>,
+			<0x180aa024 0x4>;
+		clocks = <&osc>;
+		clock-output-names = "keypad", "adc/touch", "pwm";
 	};
 };
diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..2b99e9c 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -134,7 +134,7 @@
 		compatible = "arm,cortex-a9-global-timer";
 		reg = <0x19020200 0x100>;
 		interrupts = <GIC_PPI 11 IRQ_TYPE_LEVEL_HIGH>;
-		clocks = <&periph_clk>;
+		clocks = <&arm_periph_clk>;
 	};
 
 };
-- 
1.7.9.5

[PATCH 4/4] ARM: dts: enable clock support for Broadcom Cygnus

[Ray Jui]

Replace current device tree dummy clocks with real clock support for
Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbraden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus-clock.dtsi |  110 ++++++++++++++++++++++++-------
 arch/arm/boot/dts/bcm-cygnus.dtsi       |    2 +-
 2 files changed, 86 insertions(+), 26 deletions(-)

diff --git a/arch/arm/boot/dts/bcm-cygnus-clock.dtsi b/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
index 60d8389..f2da5e2 100644
--- a/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
@@ -36,56 +36,116 @@ clocks {
 	ranges;
 
 	osc: oscillator {
+		#clock-cells = <0>;
 		compatible = "fixed-clock";
-		#clock-cells = <1>;
 		clock-frequency = <25000000>;
 	};
 
-	apb_clk: apb_clk {
-		compatible = "fixed-clock";
+	/* Cygnus ARM PLL */
+	armpll: armpll {
 		#clock-cells = <0>;
-		clock-frequency = <1000000000>;
+		compatible = "brcm,cygnus-armpll";
+		clocks = <&osc>;
+		reg = <0x19000000 0x1000>;
 	};
 
-	periph_clk: periph_clk {
-		compatible = "fixed-clock";
+	/* peripheral clock for system timer */
+	arm_periph_clk: arm_periph_clk {
 		#clock-cells = <0>;
-		clock-frequency = <500000000>;
+		compatible = "fixed-factor-clock";
+		clocks = <&armpll>;
+		clock-div = <2>;
+		clock-mult = <1>;
 	};
 
-	sdio_clk: lcpll_ch2 {
-		compatible = "fixed-clock";
+	/* APB bus clock */
+	apb_clk: apb_clk {
 		#clock-cells = <0>;
-		clock-frequency = <200000000>;
+		compatible = "fixed-factor-clock";
+		clocks = <&armpll>;
+		clock-div = <4>;
+		clock-mult = <1>;
 	};
 
-	axi81_clk: axi81_clk {
-		compatible = "fixed-clock";
+	genpll: genpll {
 		#clock-cells = <0>;
-		clock-frequency = <100000000>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
 	};
 
-	keypad_clk: keypad_clk {
-		compatible = "fixed-clock";
+	/* various clocks running off the GENPLL */
+	genpll_clks: genpll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-genpll-clk";
+		reg = <0x0301d000 0x2c>;
+		clocks = <&genpll>;
+		clock-output-names = "axi21", "250mhz", "ihost_sys",
+			"enet_sw", "audio_125", "can";
+	};
+
+	/* always 1/2 of the axi21 clock */
+	axi41_clk: axi41_clk {
 		#clock-cells = <0>;
-		clock-frequency = <31806>;
+		compatible = "fixed-factor-clock";
+		clocks = <&genpll_clks 0>;
+		clock-div = <2>;
+		clock-mult = <1>;
 	};
 
-	adc_clk: adc_clk {
-		compatible = "fixed-clock";
+	/* always 1/4 of the axi21 clock */
+	axi81_clk: axi81_clk {
 		#clock-cells = <0>;
-		clock-frequency = <1562500>;
+		compatible = "fixed-factor-clock";
+		clocks = <&genpll_clks 0>;
+		clock-div = <4>;
+		clock-mult = <1>;
 	};
 
-	pwm_clk: pwm_clk {
-		compatible = "fixed-clock";
+	lcpll0: lcpll0 {
 		#clock-cells = <0>;
-		clock-frequency = <1000000>;
+		compatible = "brcm,cygnus-lcpll0";
+		reg = <0x0301d02c 0x1c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
 	};
 
-	lcd_clk: mipipll_ch1 {
-		compatible = "fixed-clock";
+	/* various clocks running off the LCPLL0 */
+	lcpll0_clks: lcpll0_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-lcpll0-clk";
+		reg = <0x0301d02c 0x1c>;
+		clocks = <&lcpll0>;
+		clock-output-names = "pcie_phy", "ddr_phy", "sdio",
+			"usb_phy", "smart_card", "ch5";
+	};
+
+	mipipll: mipipll {
 		#clock-cells = <0>;
-		clock-frequency = <100000000>;
+		compatible = "brcm,cygnus-mipipll";
+		reg = <0x180a9800 0x2c>,
+			<0x0301c020 0x4>,
+			<0x180aa024 0x4>;
+		clock-frequency = <1350000000>;
+		clocks = <&osc>;
+	};
+
+	mipipll_clks: mipipll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-mipipll-clk";
+		reg = <0x180a9800 0x2c>;
+		clocks = <&mipipll>;
+		clock-output-names = "ch0_unused", "ch1_lcd", "ch2_unused",
+			"ch3_unused", "ch4_unused", "ch5_unused";
+	};
+
+	asiu_clks: asiu_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-asiu-clk";
+		reg = <0x0301d048 0xc>,
+			<0x180aa024 0x4>;
+		clocks = <&osc>;
+		clock-output-names = "keypad", "adc/touch", "pwm";
 	};
 };
diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..2b99e9c 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -134,7 +134,7 @@
 		compatible = "arm,cortex-a9-global-timer";
 		reg = <0x19020200 0x100>;
 		interrupts = <GIC_PPI 11 IRQ_TYPE_LEVEL_HIGH>;
-		clocks = <&periph_clk>;
+		clocks = <&arm_periph_clk>;
 	};
 
 };
-- 
1.7.9.5

[PATCH 0/4] Add common clock support for Broadcom iProc architecture

[Ray Jui]

This patchset contains the initial common clock support for Broadcom's iProc
family of SoCs. The iProc clock architecture comprises of various PLLs, e.g.,
ARMPLL, GENPLL, LCPLL0, MIPIPLL, and etc. An onboard crystal serves as the
basic reference clock for these PLLs. Each PLL may have several leaf clocks.
One special group of clocks is the ASIU clocks, which are dervied directly
from the crystal reference clock.

This patchset also contains the basic clock support for the Broadcom Cygnus
SoC, which implements the iProc clock architecture

Ray Jui (4):
  clk: iproc: define Broadcom iProc clock binding
  clk: iproc: add initial common clock support
  clk: cygnus: add clock support for Broadcom Cygnus
  ARM: dts: enable clock support for Broadcom Cygnus

 arch/arm/boot/dts/bcm-cygnus-clock.dtsi |  110 +++++--
 arch/arm/boot/dts/bcm-cygnus.dtsi       |    2 +-
 brcm,iproc-clocks.txt                   |  178 ++++++++++++
 drivers/clk/Makefile                    |    2 +-
 drivers/clk/bcm/Kconfig                 |    9 +
 drivers/clk/bcm/Makefile                |    2 +
 drivers/clk/bcm/clk-cygnus.c            |  277 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-armpll.c      |  286 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-asiu.c        |  275 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-clk.c         |  238 +++++++++++++++
 drivers/clk/bcm/clk-iproc-pll.c         |  483 +++++++++++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc.h             |  155 ++++++++++
 include/dt-bindings/clock/bcm-cygnus.h  |   77 +++++
 13 files changed, 2067 insertions(+), 27 deletions(-)
 create mode 100644 brcm,iproc-clocks.txt
 create mode 100644 drivers/clk/bcm/clk-cygnus.c
 create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
 create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
 create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
 create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
 create mode 100644 drivers/clk/bcm/clk-iproc.h
 create mode 100644 include/dt-bindings/clock/bcm-cygnus.h

-- 
1.7.9.5

[PATCH 0/4] Add common clock support for Broadcom iProc architecture

[Ray Jui]

This patchset contains the initial common clock support for Broadcom's iProc
family of SoCs. The iProc clock architecture comprises of various PLLs, e.g.,
ARMPLL, GENPLL, LCPLL0, MIPIPLL, and etc. An onboard crystal serves as the
basic reference clock for these PLLs. Each PLL may have several leaf clocks.
One special group of clocks is the ASIU clocks, which are dervied directly
from the crystal reference clock.

This patchset also contains the basic clock support for the Broadcom Cygnus
SoC, which implements the iProc clock architecture

Ray Jui (4):
  clk: iproc: define Broadcom iProc clock binding
  clk: iproc: add initial common clock support
  clk: cygnus: add clock support for Broadcom Cygnus
  ARM: dts: enable clock support for Broadcom Cygnus

 arch/arm/boot/dts/bcm-cygnus-clock.dtsi |  110 +++++--
 arch/arm/boot/dts/bcm-cygnus.dtsi       |    2 +-
 brcm,iproc-clocks.txt                   |  178 ++++++++++++
 drivers/clk/Makefile                    |    2 +-
 drivers/clk/bcm/Kconfig                 |    9 +
 drivers/clk/bcm/Makefile                |    2 +
 drivers/clk/bcm/clk-cygnus.c            |  277 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-armpll.c      |  286 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-asiu.c        |  275 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-clk.c         |  238 +++++++++++++++
 drivers/clk/bcm/clk-iproc-pll.c         |  483 +++++++++++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc.h             |  155 ++++++++++
 include/dt-bindings/clock/bcm-cygnus.h  |   77 +++++
 13 files changed, 2067 insertions(+), 27 deletions(-)
 create mode 100644 brcm,iproc-clocks.txt
 create mode 100644 drivers/clk/bcm/clk-cygnus.c
 create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
 create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
 create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
 create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
 create mode 100644 drivers/clk/bcm/clk-iproc.h
 create mode 100644 include/dt-bindings/clock/bcm-cygnus.h

-- 
1.7.9.5

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[PATCH 0/4] Add common clock support for Broadcom iProc architecture

[Ray Jui]

This patchset contains the initial common clock support for Broadcom's iProc
family of SoCs. The iProc clock architecture comprises of various PLLs, e.g.,
ARMPLL, GENPLL, LCPLL0, MIPIPLL, and etc. An onboard crystal serves as the
basic reference clock for these PLLs. Each PLL may have several leaf clocks.
One special group of clocks is the ASIU clocks, which are dervied directly
from the crystal reference clock.

This patchset also contains the basic clock support for the Broadcom Cygnus
SoC, which implements the iProc clock architecture

Ray Jui (4):
  clk: iproc: define Broadcom iProc clock binding
  clk: iproc: add initial common clock support
  clk: cygnus: add clock support for Broadcom Cygnus
  ARM: dts: enable clock support for Broadcom Cygnus

 arch/arm/boot/dts/bcm-cygnus-clock.dtsi |  110 +++++--
 arch/arm/boot/dts/bcm-cygnus.dtsi       |    2 +-
 brcm,iproc-clocks.txt                   |  178 ++++++++++++
 drivers/clk/Makefile                    |    2 +-
 drivers/clk/bcm/Kconfig                 |    9 +
 drivers/clk/bcm/Makefile                |    2 +
 drivers/clk/bcm/clk-cygnus.c            |  277 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-armpll.c      |  286 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-asiu.c        |  275 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-clk.c         |  238 +++++++++++++++
 drivers/clk/bcm/clk-iproc-pll.c         |  483 +++++++++++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc.h             |  155 ++++++++++
 include/dt-bindings/clock/bcm-cygnus.h  |   77 +++++
 13 files changed, 2067 insertions(+), 27 deletions(-)
 create mode 100644 brcm,iproc-clocks.txt
 create mode 100644 drivers/clk/bcm/clk-cygnus.c
 create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
 create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
 create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
 create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
 create mode 100644 drivers/clk/bcm/clk-iproc.h
 create mode 100644 include/dt-bindings/clock/bcm-cygnus.h

-- 
1.7.9.5

[PATCH 1/4] clk: iproc: define Broadcom iProc clock binding

[Ray Jui]

Document the device tree binding for Broadcom iProc architecture based
clock controller

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 brcm,iproc-clocks.txt |  178 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 178 insertions(+)
 create mode 100644 brcm,iproc-clocks.txt

diff --git a/brcm,iproc-clocks.txt b/brcm,iproc-clocks.txt
new file mode 100644
index 0000000..cc64fd2
--- /dev/null
+++ b/brcm,iproc-clocks.txt
@@ -0,0 +1,178 @@
+Broadcom iProc Family Clocks
+
+This binding uses the common clock binding:
+    Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+The iProc clock controller manages clocks that are common to the iProc family.
+An SoC from the iProc family may have several PPLs, e.g., ARMPLL, GENPLL,
+LCPLL0, MIPIPLL, and etc., all derived from an onboard crystal. Each PLL
+comprises of several leaf clocks
+
+Required properties for PLLs:
+- compatible:
+    Should have a value of the form "brcm,<soc>-<pll>". For example, GENPLL on
+Cygnus has a compatible string of "brcm,cygnus-genpll"
+
+- #clock-cells:
+    Must be <0>
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL
+
+- clocks:
+    The input parent clock phandle for the PLL. For all iProc PLLs, this is an
+onboard crystal with a fixed rate
+
+Optional Properties for PLLs:
+- clock-frequency:
+    PLL frequency in Hz. If specified, PLL will be configured to run at
+<clock-frequency> instead of the default frequency after chip reset, provided
+that <clock-frequency> and its parameters are defined in the SoC specific
+frequency parameter table
+
+Example:
+
+	osc: oscillator {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <25000000>;
+	};
+
+	genpll: genpll {
+		#clock-cells = <0>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
+	};
+
+Required properties for leaf clocks of a PLL:
+
+- compatible:
+    Should have a value of the form "brcm,<soc>-<pll>-clk". For example, leaf
+clocks derived from the GENPLL on Cygnus SoC have a compatible string of
+"brcm,cygnus-genpll-clk"
+
+- #clock-cells:
+    Have a value of <1> since there are more than 1 leaf clock of a
+given PLL
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL leaf clocks
+
+- clocks:
+    The input parent PLL phandle for the leaf clock
+
+- clock-output-names:
+    An ordered list of strings defining the names of the leaf clocks
+
+Example:
+
+	genpll: genpll {
+		#clock-cells = <0>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
+	};
+
+	genpll_clks: genpll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-genpll-clk";
+		reg = <0x0301d000 0x2c>;
+		clocks = <&genpll>;
+		clock-output-names = "axi21", "250mhz", "ihost_sys",
+			"enet_sw", "audio_125", "can";
+	};
+
+Required properties for ASIU clocks:
+
+ASIU clocks are a special case. These clocks are derived directly from the
+reference clock of the onboard crystal
+
+- compatible:
+    Should have a value of the form "brcm,<soc>-asiu-clk". For example, ASIU
+clocks for Cygnus have a compatible string of "brcm,cygnus-asiu-clk"
+
+- #clock-cells:
+    Have a value of <1> since there are more than 1 ASIU clocks
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for ASIU clocks
+
+- clocks:
+    The input parent clock phandle for the ASIU clock, i.e., the onboard
+crystal
+
+- clock-output-names:
+    An ordered list of strings defining the names of the ASIU clocks
+
+Example:
+
+	osc: oscillator {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <25000000>;
+	};
+
+	asiu_clks: asiu_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-asiu-clk";
+		reg = <0x0301d048 0xc>,
+			<0x180aa024 0x4>;
+		clocks = <&osc>;
+		clock-output-names = "keypad", "adc/touch", "pwm";
+	};
+
+Cygnus
+------
+PLL and leaf clock compatible strings for Cygnus are:
+    "brcm,cygnus-armpll"
+    "brcm,cygnus-genpll"
+    "brcm,cygnus-lcpll0"
+    "brcm,cygnus-mipipll"
+    "brcm,cygnus-genpll-clk"
+    "brcm,cygnus-lcpll0-clk"
+    "brcm,cygnus-mipipll-clk"
+    "brcm,cygnus-asiu-clk"
+
+The following table defines the set of PLL/clock index and ID for Cygnus.
+These clock IDs are defined in:
+    "include/dt-bindings/clock/bcm-cygnus.h"
+
+    Clock      Source           Index   ID
+    ---        -----            -----   ---------
+    crystal    N/A              N/A     N/A
+
+    armpll     crystal          N/A     N/A
+    genpll     crystal          N/A     N/A
+    lcpll0     crystal          N/A     N/A
+    mipipll    crystal          N/A     N/A
+
+    keypad     crystal (ASIU)   0       BCM_CYGNUS_ASIU_KEYPAD_CLK
+    adc/tsc    crystal (ASIU)   1       BCM_CYGNUS_ASIU_ADC_CLK
+    pwm        crystal (ASIU)   2       BCM_CYGNUS_ASIU_PWM_CLK
+
+    axi21      genpll           0       BCM_CYGNUS_GENPLL_AXI21_CLK
+    250mhz     genpll           1       BCM_CYGNUS_GENPLL_250MHZ_CLK
+    ihost_sys  genpll           2       BCM_CYGNUS_GENPLL_IHOST_SYS_CLK
+    enet_sw    genpll           3       BCM_CYGNUS_GENPLL_ENET_SW_CLK
+    audio_125  genpll           4       BCM_CYGNUS_GENPLL_AUDIO_125_CLK
+    can        genpll           5       BCM_CYGNUS_GENPLL_CAN_CLK
+
+    pcie_phy   lcpll0           0       BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK
+    ddr_phy    lcpll0           1       BCM_CYGNUS_LCPLL0_DDR_PHY_CLK
+    sdio       lcpll0           2       BCM_CYGNUS_LCPLL0_SDIO_CLK
+    usb_phy    lcpll0           3       BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK
+    smart_card lcpll0           4       BCM_CYGNUS_LCPLL0_SMART_CARD_CLK
+    ch5        lcpll0           5       BCM_CYGNUS_LCPLL0_CH5_UNUSED
+
+    ch0_unused mipipll          0       BCM_CYGNUS_MIPIPLL_CH0_UNUSED
+    ch1_lcd    mipipll          1       BCM_CYGNUS_MIPIPLL_CH1_LCD
+    ch2_unused mipipll          2       BCM_CYGNUS_MIPIPLL_CH2_UNUSED
+    ch3_unused mipipll          3       BCM_CYGNUS_MIPIPLL_CH3_UNUSED
+    ch4_unused mipipll          4       BCM_CYGNUS_MIPIPLL_CH4_UNUSED
+    ch5_unused mipipll          5       BCM_CYGNUS_MIPIPLL_CH5_UNUSED
-- 
1.7.9.5

[PATCH 1/4] clk: iproc: define Broadcom iProc clock binding

[Ray Jui]

Document the device tree binding for Broadcom iProc architecture based
clock controller

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 brcm,iproc-clocks.txt |  178 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 178 insertions(+)
 create mode 100644 brcm,iproc-clocks.txt

diff --git a/brcm,iproc-clocks.txt b/brcm,iproc-clocks.txt
new file mode 100644
index 0000000..cc64fd2
--- /dev/null
+++ b/brcm,iproc-clocks.txt
@@ -0,0 +1,178 @@
+Broadcom iProc Family Clocks
+
+This binding uses the common clock binding:
+    Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+The iProc clock controller manages clocks that are common to the iProc family.
+An SoC from the iProc family may have several PPLs, e.g., ARMPLL, GENPLL,
+LCPLL0, MIPIPLL, and etc., all derived from an onboard crystal. Each PLL
+comprises of several leaf clocks
+
+Required properties for PLLs:
+- compatible:
+    Should have a value of the form "brcm,<soc>-<pll>". For example, GENPLL on
+Cygnus has a compatible string of "brcm,cygnus-genpll"
+
+- #clock-cells:
+    Must be <0>
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL
+
+- clocks:
+    The input parent clock phandle for the PLL. For all iProc PLLs, this is an
+onboard crystal with a fixed rate
+
+Optional Properties for PLLs:
+- clock-frequency:
+    PLL frequency in Hz. If specified, PLL will be configured to run at
+<clock-frequency> instead of the default frequency after chip reset, provided
+that <clock-frequency> and its parameters are defined in the SoC specific
+frequency parameter table
+
+Example:
+
+	osc: oscillator {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <25000000>;
+	};
+
+	genpll: genpll {
+		#clock-cells = <0>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
+	};
+
+Required properties for leaf clocks of a PLL:
+
+- compatible:
+    Should have a value of the form "brcm,<soc>-<pll>-clk". For example, leaf
+clocks derived from the GENPLL on Cygnus SoC have a compatible string of
+"brcm,cygnus-genpll-clk"
+
+- #clock-cells:
+    Have a value of <1> since there are more than 1 leaf clock of a
+given PLL
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL leaf clocks
+
+- clocks:
+    The input parent PLL phandle for the leaf clock
+
+- clock-output-names:
+    An ordered list of strings defining the names of the leaf clocks
+
+Example:
+
+	genpll: genpll {
+		#clock-cells = <0>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
+	};
+
+	genpll_clks: genpll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-genpll-clk";
+		reg = <0x0301d000 0x2c>;
+		clocks = <&genpll>;
+		clock-output-names = "axi21", "250mhz", "ihost_sys",
+			"enet_sw", "audio_125", "can";
+	};
+
+Required properties for ASIU clocks:
+
+ASIU clocks are a special case. These clocks are derived directly from the
+reference clock of the onboard crystal
+
+- compatible:
+    Should have a value of the form "brcm,<soc>-asiu-clk". For example, ASIU
+clocks for Cygnus have a compatible string of "brcm,cygnus-asiu-clk"
+
+- #clock-cells:
+    Have a value of <1> since there are more than 1 ASIU clocks
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for ASIU clocks
+
+- clocks:
+    The input parent clock phandle for the ASIU clock, i.e., the onboard
+crystal
+
+- clock-output-names:
+    An ordered list of strings defining the names of the ASIU clocks
+
+Example:
+
+	osc: oscillator {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <25000000>;
+	};
+
+	asiu_clks: asiu_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-asiu-clk";
+		reg = <0x0301d048 0xc>,
+			<0x180aa024 0x4>;
+		clocks = <&osc>;
+		clock-output-names = "keypad", "adc/touch", "pwm";
+	};
+
+Cygnus
+------
+PLL and leaf clock compatible strings for Cygnus are:
+    "brcm,cygnus-armpll"
+    "brcm,cygnus-genpll"
+    "brcm,cygnus-lcpll0"
+    "brcm,cygnus-mipipll"
+    "brcm,cygnus-genpll-clk"
+    "brcm,cygnus-lcpll0-clk"
+    "brcm,cygnus-mipipll-clk"
+    "brcm,cygnus-asiu-clk"
+
+The following table defines the set of PLL/clock index and ID for Cygnus.
+These clock IDs are defined in:
+    "include/dt-bindings/clock/bcm-cygnus.h"
+
+    Clock      Source           Index   ID
+    ---        -----            -----   ---------
+    crystal    N/A              N/A     N/A
+
+    armpll     crystal          N/A     N/A
+    genpll     crystal          N/A     N/A
+    lcpll0     crystal          N/A     N/A
+    mipipll    crystal          N/A     N/A
+
+    keypad     crystal (ASIU)   0       BCM_CYGNUS_ASIU_KEYPAD_CLK
+    adc/tsc    crystal (ASIU)   1       BCM_CYGNUS_ASIU_ADC_CLK
+    pwm        crystal (ASIU)   2       BCM_CYGNUS_ASIU_PWM_CLK
+
+    axi21      genpll           0       BCM_CYGNUS_GENPLL_AXI21_CLK
+    250mhz     genpll           1       BCM_CYGNUS_GENPLL_250MHZ_CLK
+    ihost_sys  genpll           2       BCM_CYGNUS_GENPLL_IHOST_SYS_CLK
+    enet_sw    genpll           3       BCM_CYGNUS_GENPLL_ENET_SW_CLK
+    audio_125  genpll           4       BCM_CYGNUS_GENPLL_AUDIO_125_CLK
+    can        genpll           5       BCM_CYGNUS_GENPLL_CAN_CLK
+
+    pcie_phy   lcpll0           0       BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK
+    ddr_phy    lcpll0           1       BCM_CYGNUS_LCPLL0_DDR_PHY_CLK
+    sdio       lcpll0           2       BCM_CYGNUS_LCPLL0_SDIO_CLK
+    usb_phy    lcpll0           3       BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK
+    smart_card lcpll0           4       BCM_CYGNUS_LCPLL0_SMART_CARD_CLK
+    ch5        lcpll0           5       BCM_CYGNUS_LCPLL0_CH5_UNUSED
+
+    ch0_unused mipipll          0       BCM_CYGNUS_MIPIPLL_CH0_UNUSED
+    ch1_lcd    mipipll          1       BCM_CYGNUS_MIPIPLL_CH1_LCD
+    ch2_unused mipipll          2       BCM_CYGNUS_MIPIPLL_CH2_UNUSED
+    ch3_unused mipipll          3       BCM_CYGNUS_MIPIPLL_CH3_UNUSED
+    ch4_unused mipipll          4       BCM_CYGNUS_MIPIPLL_CH4_UNUSED
+    ch5_unused mipipll          5       BCM_CYGNUS_MIPIPLL_CH5_UNUSED
-- 
1.7.9.5

[PATCH 1/4] clk: iproc: define Broadcom iProc clock binding

[Ray Jui]

Document the device tree binding for Broadcom iProc architecture based
clock controller

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 brcm,iproc-clocks.txt |  178 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 178 insertions(+)
 create mode 100644 brcm,iproc-clocks.txt

diff --git a/brcm,iproc-clocks.txt b/brcm,iproc-clocks.txt
new file mode 100644
index 0000000..cc64fd2
--- /dev/null
+++ b/brcm,iproc-clocks.txt
@@ -0,0 +1,178 @@
+Broadcom iProc Family Clocks
+
+This binding uses the common clock binding:
+    Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+The iProc clock controller manages clocks that are common to the iProc family.
+An SoC from the iProc family may have several PPLs, e.g., ARMPLL, GENPLL,
+LCPLL0, MIPIPLL, and etc., all derived from an onboard crystal. Each PLL
+comprises of several leaf clocks
+
+Required properties for PLLs:
+- compatible:
+    Should have a value of the form "brcm,<soc>-<pll>". For example, GENPLL on
+Cygnus has a compatible string of "brcm,cygnus-genpll"
+
+- #clock-cells:
+    Must be <0>
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL
+
+- clocks:
+    The input parent clock phandle for the PLL. For all iProc PLLs, this is an
+onboard crystal with a fixed rate
+
+Optional Properties for PLLs:
+- clock-frequency:
+    PLL frequency in Hz. If specified, PLL will be configured to run at
+<clock-frequency> instead of the default frequency after chip reset, provided
+that <clock-frequency> and its parameters are defined in the SoC specific
+frequency parameter table
+
+Example:
+
+	osc: oscillator {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <25000000>;
+	};
+
+	genpll: genpll {
+		#clock-cells = <0>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
+	};
+
+Required properties for leaf clocks of a PLL:
+
+- compatible:
+    Should have a value of the form "brcm,<soc>-<pll>-clk". For example, leaf
+clocks derived from the GENPLL on Cygnus SoC have a compatible string of
+"brcm,cygnus-genpll-clk"
+
+- #clock-cells:
+    Have a value of <1> since there are more than 1 leaf clock of a
+given PLL
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL leaf clocks
+
+- clocks:
+    The input parent PLL phandle for the leaf clock
+
+- clock-output-names:
+    An ordered list of strings defining the names of the leaf clocks
+
+Example:
+
+	genpll: genpll {
+		#clock-cells = <0>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
+	};
+
+	genpll_clks: genpll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-genpll-clk";
+		reg = <0x0301d000 0x2c>;
+		clocks = <&genpll>;
+		clock-output-names = "axi21", "250mhz", "ihost_sys",
+			"enet_sw", "audio_125", "can";
+	};
+
+Required properties for ASIU clocks:
+
+ASIU clocks are a special case. These clocks are derived directly from the
+reference clock of the onboard crystal
+
+- compatible:
+    Should have a value of the form "brcm,<soc>-asiu-clk". For example, ASIU
+clocks for Cygnus have a compatible string of "brcm,cygnus-asiu-clk"
+
+- #clock-cells:
+    Have a value of <1> since there are more than 1 ASIU clocks
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for ASIU clocks
+
+- clocks:
+    The input parent clock phandle for the ASIU clock, i.e., the onboard
+crystal
+
+- clock-output-names:
+    An ordered list of strings defining the names of the ASIU clocks
+
+Example:
+
+	osc: oscillator {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <25000000>;
+	};
+
+	asiu_clks: asiu_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-asiu-clk";
+		reg = <0x0301d048 0xc>,
+			<0x180aa024 0x4>;
+		clocks = <&osc>;
+		clock-output-names = "keypad", "adc/touch", "pwm";
+	};
+
+Cygnus
+------
+PLL and leaf clock compatible strings for Cygnus are:
+    "brcm,cygnus-armpll"
+    "brcm,cygnus-genpll"
+    "brcm,cygnus-lcpll0"
+    "brcm,cygnus-mipipll"
+    "brcm,cygnus-genpll-clk"
+    "brcm,cygnus-lcpll0-clk"
+    "brcm,cygnus-mipipll-clk"
+    "brcm,cygnus-asiu-clk"
+
+The following table defines the set of PLL/clock index and ID for Cygnus.
+These clock IDs are defined in:
+    "include/dt-bindings/clock/bcm-cygnus.h"
+
+    Clock      Source           Index   ID
+    ---        -----            -----   ---------
+    crystal    N/A              N/A     N/A
+
+    armpll     crystal          N/A     N/A
+    genpll     crystal          N/A     N/A
+    lcpll0     crystal          N/A     N/A
+    mipipll    crystal          N/A     N/A
+
+    keypad     crystal (ASIU)   0       BCM_CYGNUS_ASIU_KEYPAD_CLK
+    adc/tsc    crystal (ASIU)   1       BCM_CYGNUS_ASIU_ADC_CLK
+    pwm        crystal (ASIU)   2       BCM_CYGNUS_ASIU_PWM_CLK
+
+    axi21      genpll           0       BCM_CYGNUS_GENPLL_AXI21_CLK
+    250mhz     genpll           1       BCM_CYGNUS_GENPLL_250MHZ_CLK
+    ihost_sys  genpll           2       BCM_CYGNUS_GENPLL_IHOST_SYS_CLK
+    enet_sw    genpll           3       BCM_CYGNUS_GENPLL_ENET_SW_CLK
+    audio_125  genpll           4       BCM_CYGNUS_GENPLL_AUDIO_125_CLK
+    can        genpll           5       BCM_CYGNUS_GENPLL_CAN_CLK
+
+    pcie_phy   lcpll0           0       BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK
+    ddr_phy    lcpll0           1       BCM_CYGNUS_LCPLL0_DDR_PHY_CLK
+    sdio       lcpll0           2       BCM_CYGNUS_LCPLL0_SDIO_CLK
+    usb_phy    lcpll0           3       BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK
+    smart_card lcpll0           4       BCM_CYGNUS_LCPLL0_SMART_CARD_CLK
+    ch5        lcpll0           5       BCM_CYGNUS_LCPLL0_CH5_UNUSED
+
+    ch0_unused mipipll          0       BCM_CYGNUS_MIPIPLL_CH0_UNUSED
+    ch1_lcd    mipipll          1       BCM_CYGNUS_MIPIPLL_CH1_LCD
+    ch2_unused mipipll          2       BCM_CYGNUS_MIPIPLL_CH2_UNUSED
+    ch3_unused mipipll          3       BCM_CYGNUS_MIPIPLL_CH3_UNUSED
+    ch4_unused mipipll          4       BCM_CYGNUS_MIPIPLL_CH4_UNUSED
+    ch5_unused mipipll          5       BCM_CYGNUS_MIPIPLL_CH5_UNUSED
-- 
1.7.9.5

[PATCH 2/4] clk: iproc: add initial common clock support

[Ray Jui]

This adds basic and generic support for various iProc PLLs and clocks
including the ARMPLL, GENPLL, LCPLL, MIPIPLL, and ASIU clocks.

SoCs under the iProc architecture can define their specific register
offsets and clock parameters for their PLL and clock controllers. These
parameters can be passed as arugments into the generic iProc PLL and
clock setup functions

Derived from code originally provided by Jonathan Richardson
<jonathar@broadcom.com>

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/clk/Makefile               |    2 +-
 drivers/clk/bcm/Kconfig            |    9 +
 drivers/clk/bcm/Makefile           |    1 +
 drivers/clk/bcm/clk-iproc-armpll.c |  286 +++++++++++++++++++++
 drivers/clk/bcm/clk-iproc-asiu.c   |  275 ++++++++++++++++++++
 drivers/clk/bcm/clk-iproc-clk.c    |  238 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-pll.c    |  483 ++++++++++++++++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc.h        |  155 ++++++++++++
 8 files changed, 1448 insertions(+), 1 deletion(-)
 create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
 create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
 create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
 create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
 create mode 100644 drivers/clk/bcm/clk-iproc.h

diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index d5fba5b..eff0213 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -41,7 +41,7 @@ obj-$(CONFIG_ARCH_VT8500)		+= clk-vt8500.o
 obj-$(CONFIG_COMMON_CLK_WM831X)		+= clk-wm831x.o
 obj-$(CONFIG_COMMON_CLK_XGENE)		+= clk-xgene.o
 obj-$(CONFIG_COMMON_CLK_AT91)		+= at91/
-obj-$(CONFIG_ARCH_BCM_MOBILE)		+= bcm/
+obj-$(CONFIG_ARCH_BCM)			+= bcm/
 obj-$(CONFIG_ARCH_BERLIN)		+= berlin/
 obj-$(CONFIG_ARCH_HI3xxx)		+= hisilicon/
 obj-$(CONFIG_ARCH_HIP04)		+= hisilicon/
diff --git a/drivers/clk/bcm/Kconfig b/drivers/clk/bcm/Kconfig
index 75506e5..66b5b7f 100644
--- a/drivers/clk/bcm/Kconfig
+++ b/drivers/clk/bcm/Kconfig
@@ -7,3 +7,12 @@ config CLK_BCM_KONA
 	  Enable common clock framework support for Broadcom SoCs
 	  using "Kona" style clock control units, including those
 	  in the BCM281xx and BCM21664 families.
+
+config COMMON_CLK_IPROC
+	bool "Broadcom iProc clock support"
+	depends on ARCH_BCM_IPROC
+	depends on COMMON_CLK
+	default y
+	help
+	  Enable common clock framework support for Broadcom SoCs
+	  based on the "iProc" architecture
diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
index 6297d05..6926636 100644
--- a/drivers/clk/bcm/Makefile
+++ b/drivers/clk/bcm/Makefile
@@ -2,3 +2,4 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
+obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
diff --git a/drivers/clk/bcm/clk-iproc-armpll.c b/drivers/clk/bcm/clk-iproc-armpll.c
new file mode 100644
index 0000000..ec9b130
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-armpll.c
@@ -0,0 +1,286 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+
+#define IPROC_CLK_MAX_FREQ_POLICY                    0x3
+#define IPROC_CLK_POLICY_FREQ_OFFSET                 0x008
+#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT      8
+#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK       0x7
+
+#define IPROC_CLK_PLLARMA_OFFSET                     0xc00
+#define IPROC_CLK_PLLARMA_LOCK_SHIFT                 28
+#define IPROC_CLK_PLLARMA_PDIV_SHIFT                 24
+#define IPROC_CLK_PLLARMA_PDIV_MASK                  0xf
+#define IPROC_CLK_PLLARMA_NDIV_INT_SHIFT             8
+#define IPROC_CLK_PLLARMA_NDIV_INT_MASK              0x3ff
+
+#define IPROC_CLK_PLLARMB_OFFSET                     0xc04
+#define IPROC_CLK_PLLARMB_NDIV_FRAC_MASK             0xfffff
+
+#define IPROC_CLK_PLLARMC_OFFSET                     0xc08
+#define IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT            8
+#define IPROC_CLK_PLLARMC_MDIV_MASK                  0xff
+
+#define IPROC_CLK_PLLARMCTL5_OFFSET                  0xc20
+#define IPROC_CLK_PLLARMCTL5_H_MDIV_MASK             0xff
+
+#define IPROC_CLK_PLLARM_OFFSET_OFFSET               0xc24
+#define IPROC_CLK_PLLARM_SW_CTL_SHIFT                29
+#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT       20
+#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK        0xff
+#define IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK       0xfffff
+
+#define IPROC_CLK_ARM_DIV_OFFSET                     0xe00
+#define IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT  4
+#define IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK        0xf
+
+#define IPROC_CLK_POLICY_DBG_OFFSET                  0xec0
+#define IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT          12
+#define IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK           0x7
+
+enum iproc_arm_pll_fid {
+	ARM_PLL_FID_CRYSTAL_CLK   = 0,
+	ARM_PLL_FID_SYS_CLK       = 2,
+	ARM_PLL_FID_CH0_SLOW_CLK  = 6,
+	ARM_PLL_FID_CH1_FAST_CLK  = 7
+};
+
+struct iproc_arm_pll {
+	struct clk_hw hw;
+	void __iomem *base;
+	struct clk_onecell_data clk_data;
+	unsigned long rate;
+};
+
+#define to_iproc_arm_pll(hw) container_of(hw, struct iproc_arm_pll, hw)
+
+static unsigned int __get_fid(struct iproc_arm_pll *pll)
+{
+	u32 val;
+	unsigned int policy, fid, active_fid;
+
+	val = readl(pll->base + IPROC_CLK_ARM_DIV_OFFSET);
+	if (val & (1 << IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT))
+		policy = val & IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK;
+	else
+		policy = 0;
+
+	/* something is seriously wrong */
+	BUG_ON(policy > IPROC_CLK_MAX_FREQ_POLICY);
+
+	val = readl(pll->base + IPROC_CLK_POLICY_FREQ_OFFSET);
+	fid = (val >> (IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT * policy)) &
+		IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK;
+
+	val = readl(pll->base + IPROC_CLK_POLICY_DBG_OFFSET);
+	active_fid = IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK &
+		(val >> IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT);
+	if (fid != active_fid) {
+		pr_debug("%s: fid override %u->%u\n", __func__,	fid,
+				active_fid);
+		fid = active_fid;
+	}
+
+	pr_debug("%s: active fid: %u\n", __func__, fid);
+
+	return fid;
+}
+
+/*
+ * Determine the mdiv (post divider) based on the frequency ID being used.
+ * There are 4 sources that can be used to derive the output clock rate:
+ *    - 25 MHz Crystal
+ *    - System clock
+ *    - PLL channel 0 (slow clock)
+ *    - PLL channel 1 (fast clock)
+ */
+static int __get_mdiv(struct iproc_arm_pll *pll)
+{
+	unsigned int fid;
+	int mdiv;
+	u32 val;
+
+	fid = __get_fid(pll);
+
+	switch (fid) {
+	case ARM_PLL_FID_CRYSTAL_CLK:
+	case ARM_PLL_FID_SYS_CLK:
+		mdiv = 1;
+		break;
+
+	case ARM_PLL_FID_CH0_SLOW_CLK:
+		val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
+		mdiv = val & IPROC_CLK_PLLARMC_MDIV_MASK;
+		if (mdiv == 0)
+			mdiv = 256;
+		break;
+
+	case ARM_PLL_FID_CH1_FAST_CLK:
+		val = readl(pll->base +	IPROC_CLK_PLLARMCTL5_OFFSET);
+		mdiv = val & IPROC_CLK_PLLARMCTL5_H_MDIV_MASK;
+		if (mdiv == 0)
+			mdiv = 256;
+		break;
+
+	default:
+		mdiv = -EFAULT;
+	}
+
+	return mdiv;
+}
+
+static unsigned int __get_ndiv(struct iproc_arm_pll *pll)
+{
+	u32 val;
+	unsigned int ndiv_int, ndiv_frac, ndiv;
+
+	val = readl(pll->base + IPROC_CLK_PLLARM_OFFSET_OFFSET);
+	if (val & (1 << IPROC_CLK_PLLARM_SW_CTL_SHIFT)) {
+		/*
+		 * offset mode is active. Read the ndiv from the PLLARM OFFSET
+		 * register
+		 */
+		ndiv_int = (val >> IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT) &
+			IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK;
+		if (ndiv_int == 0)
+			ndiv_int = 256;
+
+		ndiv_frac = val & IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK;
+	} else {
+		/* offset mode not active */
+		val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
+		ndiv_int = (val >> IPROC_CLK_PLLARMA_NDIV_INT_SHIFT) &
+			IPROC_CLK_PLLARMA_NDIV_INT_MASK;
+		if (ndiv_int == 0)
+			ndiv_int = 1024;
+
+		val = readl(pll->base + IPROC_CLK_PLLARMB_OFFSET);
+		ndiv_frac = val & IPROC_CLK_PLLARMB_NDIV_FRAC_MASK;
+	}
+
+	ndiv = (ndiv_int << 20) | ndiv_frac;
+
+	return ndiv;
+}
+
+/*
+ * The output frequency of the ARM PLL is calculated based on the ARM PLL
+ * divider values:
+ *   pdiv = ARM PLL pre-divider
+ *   ndiv = ARM PLL multiplier
+ *   mdiv = ARM PLL post divider
+ *
+ * The frequency is calculated by:
+ *   ((ndiv * parent clock rate) / pdiv) / mdiv
+ */
+static unsigned long iproc_arm_pll_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_arm_pll *pll = to_iproc_arm_pll(hw);
+	u32 val;
+	int mdiv;
+	u64 ndiv;
+	unsigned int pdiv;
+
+	/* in bypass mode, use parent rate */
+	val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
+	if (val & (1 << IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT)) {
+		pll->rate = parent_rate;
+		return pll->rate;
+	}
+
+	/* PLL needs to be locked */
+	val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
+	if (!(val & (1 << IPROC_CLK_PLLARMA_LOCK_SHIFT))) {
+		pll->rate = 0;
+		return 0;
+	}
+
+	pdiv = (val >> IPROC_CLK_PLLARMA_PDIV_SHIFT) &
+		IPROC_CLK_PLLARMA_PDIV_MASK;
+	if (pdiv == 0)
+		pdiv = 16;
+
+	ndiv = __get_ndiv(pll);
+	mdiv = __get_mdiv(pll);
+	if (mdiv <= 0) {
+		pll->rate = 0;
+		return 0;
+	}
+	pll->rate = (ndiv * parent_rate) >> 20;
+	pll->rate = (pll->rate / pdiv) / mdiv;
+
+	pr_debug("%s: ARM PLL rate: %lu. parent rate: %lu\n", __func__,
+			pll->rate, parent_rate);
+	pr_debug("%s: ndiv_int: %u, pdiv: %u, mdiv: %d\n", __func__,
+			(unsigned int)(ndiv >> 20), pdiv, mdiv);
+
+	return pll->rate;
+}
+
+static const struct clk_ops iproc_arm_pll_ops = {
+	.recalc_rate = iproc_arm_pll_recalc_rate,
+};
+
+void __init iproc_armpll_setup(struct device_node *node)
+{
+	int ret;
+	struct clk *clk;
+	struct iproc_arm_pll *pll;
+	struct clk_init_data init;
+	const char *parent_name;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->base = of_iomap(node, 0);
+	if (WARN_ON(!pll->base))
+		goto err_free_pll;
+
+	init.name = node->name;
+	init.ops = &iproc_arm_pll_ops;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	pll->hw.init = &init;
+
+	clk = clk_register(NULL, &pll->hw);
+	if (WARN_ON(IS_ERR(clk)))
+		goto err_iounmap;
+
+	pll->clk_data.clk_num = 1;
+	pll->clk_data.clks = &clk;
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_unregister;
+
+	return;
+
+err_clk_unregister:
+	clk_unregister(clk);
+err_iounmap:
+	iounmap(pll->base);
+err_free_pll:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc-asiu.c b/drivers/clk/bcm/clk-iproc-asiu.c
new file mode 100644
index 0000000..ab86b8c
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-asiu.c
@@ -0,0 +1,275 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+struct iproc_asiu;
+
+struct iproc_asiu_clk {
+	struct clk_hw hw;
+	const char *name;
+	struct iproc_asiu *asiu;
+	unsigned long rate;
+	struct iproc_asiu_div div;
+	struct iproc_asiu_gate gate;
+};
+
+struct iproc_asiu {
+	void __iomem *div_base;
+	void __iomem *gate_base;
+
+	struct clk_onecell_data clk_data;
+	struct iproc_asiu_clk *clks;
+};
+
+#define to_asiu_clk(hw) container_of(hw, struct iproc_asiu_clk, hw)
+
+static int iproc_asiu_clk_enable(struct clk_hw *hw)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+
+	/* some clocks at the ASIU level are always enabled */
+	if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
+		return 0;
+
+	val = readl(asiu->gate_base + clk->gate.offset);
+	val |= (1 << clk->gate.en_shift);
+	writel(val, asiu->gate_base + clk->gate.offset);
+
+	return 0;
+}
+
+static void iproc_asiu_clk_disable(struct clk_hw *hw)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+
+	/* some clocks at the ASIU level are always enabled */
+	if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
+		return;
+
+	val = readl(asiu->gate_base + clk->gate.offset);
+	val &= ~(1 << clk->gate.en_shift);
+	writel(val, asiu->gate_base + clk->gate.offset);
+}
+
+static unsigned long iproc_asiu_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+	unsigned int div_h, div_l;
+
+	if (parent_rate == 0) {
+		clk->rate = 0;
+		return 0;
+	}
+
+	/* if clock divisor is not enabled, simply return parent rate */
+	val = readl(asiu->div_base + clk->div.offset);
+	if ((val & (1 << clk->div.en_shift)) == 0) {
+		clk->rate = parent_rate;
+		return parent_rate;
+	}
+
+	/* clock rate = parent rate / (high_div + 1) + (low_div + 1) */
+	div_h = (val >> clk->div.high_shift) & bit_mask(clk->div.high_width);
+	div_h++;
+	div_l = (val >> clk->div.low_shift) & bit_mask(clk->div.low_width);
+	div_l++;
+
+	clk->rate = parent_rate / (div_h + div_l);
+	pr_debug("%s: rate: %lu. parent rate: %lu div_h: %u div_l: %u\n",
+		__func__, clk->rate, parent_rate, div_h, div_l);
+
+	return clk->rate;
+}
+
+static long iproc_asiu_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	unsigned int div;
+
+	if (rate == 0 || *parent_rate == 0)
+		return -EINVAL;
+
+	if (rate == *parent_rate)
+		return *parent_rate;
+
+	div = DIV_ROUND_UP(*parent_rate, rate);
+	if (div < 2)
+		return *parent_rate;
+
+	return *parent_rate / div;
+}
+
+static int iproc_asiu_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	unsigned int div, div_h, div_l;
+	u32 val;
+
+	if (rate == 0 || parent_rate == 0)
+		return -EINVAL;
+
+	/* simply disable the divisor if one wants the same rate as parent */
+	if (rate == parent_rate) {
+		val = readl(asiu->div_base + clk->div.offset);
+		val &= ~(1 << clk->div.en_shift);
+		writel(val, asiu->div_base + clk->div.offset);
+		return 0;
+	}
+
+	div = DIV_ROUND_UP(parent_rate, rate);
+	if (div < 2)
+		return -EINVAL;
+
+	div_h = div_l = div >> 1;
+	div_h--;
+	div_l--;
+
+	val = readl(asiu->div_base + clk->div.offset);
+	val |= 1 << clk->div.en_shift;
+	if (div_h) {
+		val &= ~(bit_mask(clk->div.high_width)
+				<< clk->div.high_shift);
+		val |= div_h << clk->div.high_shift;
+	} else {
+		val &= ~(bit_mask(clk->div.high_width)
+				<< clk->div.high_shift);
+	}
+	if (div_l) {
+		val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
+		val |= div_l << clk->div.low_shift;
+	} else {
+		val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
+	}
+	writel(val, asiu->div_base + clk->div.offset);
+
+	return 0;
+}
+
+static const struct clk_ops iproc_asiu_ops = {
+	.enable = iproc_asiu_clk_enable,
+	.disable = iproc_asiu_clk_disable,
+	.recalc_rate = iproc_asiu_clk_recalc_rate,
+	.round_rate = iproc_asiu_clk_round_rate,
+	.set_rate = iproc_asiu_clk_set_rate,
+};
+
+void __init iproc_asiu_setup(struct device_node *node,
+		const struct iproc_asiu_div *div,
+		const struct iproc_asiu_gate *gate, unsigned int num_clks)
+{
+	int i, ret;
+	struct iproc_asiu *asiu;
+
+	if (WARN_ON(!gate || !div))
+		return;
+
+	asiu = kzalloc(sizeof(*asiu), GFP_KERNEL);
+	if (WARN_ON(!asiu))
+		return;
+
+	asiu->clk_data.clk_num = num_clks;
+	asiu->clk_data.clks = kcalloc(num_clks, sizeof(*asiu->clk_data.clks),
+			GFP_KERNEL);
+	if (WARN_ON(!asiu->clk_data.clks))
+		goto err_clks;
+
+	asiu->clks = kcalloc(num_clks, sizeof(*asiu->clks), GFP_KERNEL);
+	if (WARN_ON(!asiu->clks))
+		goto err_asiu_clks;
+
+	asiu->div_base = of_iomap(node, 0);
+	if (WARN_ON(!asiu->div_base))
+		goto err_iomap_div;
+
+	asiu->gate_base = of_iomap(node, 1);
+	if (WARN_ON(!asiu->gate_base))
+		goto err_iomap_gate;
+
+	for (i = 0; i < num_clks; i++) {
+		struct clk_init_data init;
+		struct clk *clk;
+		const char *parent_name;
+		struct iproc_asiu_clk *asiu_clk;
+		const char *clk_name;
+
+		clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
+		if (WARN_ON(!clk_name))
+			goto err_clk_register;
+
+		ret = of_property_read_string_index(node, "clock-output-names",
+				i, &clk_name);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+
+		asiu_clk = &asiu->clks[i];
+		asiu_clk->name = clk_name;
+		asiu_clk->asiu = asiu;
+		asiu_clk->div = div[i];
+		asiu_clk->gate = gate[i];
+		init.name = clk_name;
+		init.ops = &iproc_asiu_ops;
+		init.flags = 0;
+		parent_name = of_clk_get_parent_name(node, 0);
+		init.parent_names = (parent_name ? &parent_name : NULL);
+		init.num_parents = (parent_name ? 1 : 0);
+		asiu_clk->hw.init = &init;
+
+		clk = clk_register(NULL, &asiu_clk->hw);
+		if (WARN_ON(IS_ERR(clk)))
+			goto err_clk_register;
+		asiu->clk_data.clks[i] = clk;
+	}
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get,
+			&asiu->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_register;
+
+	return;
+
+err_clk_register:
+	for (i = 0; i < num_clks; i++)
+		kfree(asiu->clks[i].name);
+	iounmap(asiu->gate_base);
+
+err_iomap_gate:
+	iounmap(asiu->div_base);
+
+err_iomap_div:
+	kfree(asiu->clks);
+
+err_asiu_clks:
+	kfree(asiu->clk_data.clks);
+
+err_clks:
+	kfree(asiu);
+}
diff --git a/drivers/clk/bcm/clk-iproc-clk.c b/drivers/clk/bcm/clk-iproc-clk.c
new file mode 100644
index 0000000..be3c42c
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-clk.c
@@ -0,0 +1,238 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+struct iproc_pll;
+
+struct iproc_clk {
+	struct clk_hw hw;
+	const char *name;
+	struct iproc_pll *pll;
+	unsigned long rate;
+	const struct iproc_clk_ctrl *ctrl;
+};
+
+struct iproc_pll {
+	void __iomem *base;
+	struct clk_onecell_data clk_data;
+	struct iproc_clk *clks;
+};
+
+#define to_iproc_clk(hw) container_of(hw, struct iproc_clk, hw)
+
+static int iproc_clk_enable(struct clk_hw *hw)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+
+	/* channel enable is active low */
+	val = readl(pll->base + ctrl->enable.offset);
+	val &= ~(1 << ctrl->enable.enable_shift);
+	writel(val, pll->base + ctrl->enable.offset);
+
+	/* also make sure channel is not held */
+	val = readl(pll->base + ctrl->enable.offset);
+	val &= ~(1 << ctrl->enable.hold_shift);
+	writel(val, pll->base + ctrl->enable.offset);
+
+	return 0;
+}
+
+static void iproc_clk_disable(struct clk_hw *hw)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+
+	if (ctrl->flags & IPROC_CLK_AON)
+		return;
+
+	val = readl(pll->base + ctrl->enable.offset);
+	val |= 1 << ctrl->enable.enable_shift;
+	writel(val, pll->base + ctrl->enable.offset);
+}
+
+static unsigned long iproc_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+	unsigned int mdiv;
+
+	if (parent_rate == 0)
+		return 0;
+
+	val = readl(pll->base + ctrl->mdiv.offset);
+	mdiv = (val >> ctrl->mdiv.shift) & bit_mask(ctrl->mdiv.width);
+	if (mdiv == 0)
+		mdiv = 256;
+
+	clk->rate = parent_rate / mdiv;
+
+	return clk->rate;
+}
+
+static long iproc_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	unsigned int div;
+
+	if (rate == 0 || *parent_rate == 0)
+		return -EINVAL;
+
+	if (rate == *parent_rate)
+		return *parent_rate;
+
+	div = DIV_ROUND_UP(*parent_rate, rate);
+	if (div < 2)
+		return *parent_rate;
+
+	if (div > 256)
+		div = 256;
+
+	return *parent_rate / div;
+}
+
+static int iproc_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+	unsigned int div;
+
+	if (rate == 0 || parent_rate == 0)
+		return -EINVAL;
+
+	div = DIV_ROUND_UP(parent_rate, rate);
+	if (div > 256)
+		return -EINVAL;
+
+	val = readl(pll->base + ctrl->mdiv.offset);
+	if (div == 256) {
+		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
+	} else {
+		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
+		val |= div << ctrl->mdiv.shift;
+	}
+	writel(val, pll->base + ctrl->mdiv.offset);
+	clk->rate = parent_rate / div;
+
+	return 0;
+}
+
+static const struct clk_ops iproc_clk_ops = {
+	.enable = iproc_clk_enable,
+	.disable = iproc_clk_disable,
+	.recalc_rate = iproc_clk_recalc_rate,
+	.round_rate = iproc_clk_round_rate,
+	.set_rate = iproc_clk_set_rate,
+};
+
+void __init iproc_clk_setup(struct device_node *node,
+		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks)
+{
+	int i, ret;
+	struct iproc_pll *pll;
+
+	if (WARN_ON(!ctrl))
+		return;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->clk_data.clk_num = num_clks;
+	pll->clk_data.clks = kcalloc(num_clks, sizeof(*pll->clk_data.clks),
+			GFP_KERNEL);
+	if (WARN_ON(!pll->clk_data.clks))
+		goto err_clks;
+
+	pll->clks = kcalloc(num_clks, sizeof(*pll->clks), GFP_KERNEL);
+	if (WARN_ON(!pll->clks))
+		goto err_pll_clks;
+
+	pll->base = of_iomap(node, 0);
+	if (WARN_ON(!pll->base))
+		goto err_iomap;
+
+	for (i = 0; i < num_clks; i++) {
+		struct clk_init_data init;
+		struct clk *clk;
+		const char *parent_name;
+		struct iproc_clk *iclk;
+		const char *clk_name;
+
+		clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
+		if (WARN_ON(!clk_name))
+			goto err_clk_register;
+
+		ret = of_property_read_string_index(node, "clock-output-names",
+				i, &clk_name);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+
+		iclk = &pll->clks[i];
+		iclk->name = clk_name;
+		iclk->pll = pll;
+		iclk->ctrl = &ctrl[i];
+		init.name = clk_name;
+		init.ops = &iproc_clk_ops;
+		init.flags = 0;
+		parent_name = of_clk_get_parent_name(node, 0);
+		init.parent_names = (parent_name ? &parent_name : NULL);
+		init.num_parents = (parent_name ? 1 : 0);
+		iclk->hw.init = &init;
+
+		clk = clk_register(NULL, &iclk->hw);
+		if (WARN_ON(IS_ERR(clk)))
+			goto err_clk_register;
+		pll->clk_data.clks[i] = clk;
+	}
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_register;
+
+	return;
+
+err_clk_register:
+	for (i = 0; i < num_clks; i++)
+		kfree(pll->clks[i].name);
+	iounmap(pll->base);
+
+err_iomap:
+	kfree(pll->clks);
+
+err_pll_clks:
+	kfree(pll->clk_data.clks);
+
+err_clks:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc-pll.c b/drivers/clk/bcm/clk-iproc-pll.c
new file mode 100644
index 0000000..cd3bd38
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-pll.c
@@ -0,0 +1,483 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+#define PLL_VCO_HIGH_SHIFT 19
+#define PLL_VCO_LOW_SHIFT  30
+
+/* number of delay loops waiting for PLL to lock */
+#define LOCK_DELAY 100
+
+/* number of VCO frequency bands */
+#define NUM_FREQ_BANDS 8
+
+#define NUM_KP_BANDS 3
+enum kp_band {
+	KP_BAND_MID = 0,
+	KP_BAND_HIGH,
+	KP_BAND_HIGH_HIGH
+};
+
+static const unsigned int kp_table[NUM_KP_BANDS][NUM_FREQ_BANDS] = {
+	{ 5, 6, 6, 7, 7, 8, 9, 10 },
+	{ 4, 4, 5, 5, 6, 7, 8, 9  },
+	{ 4, 5, 5, 6, 7, 8, 9, 10 },
+};
+
+static const unsigned long ref_freq_table[NUM_FREQ_BANDS][2] = {
+	{ 10000000,  12500000  },
+	{ 12500000,  15000000  },
+	{ 15000000,  20000000  },
+	{ 20000000,  25000000  },
+	{ 25000000,  50000000  },
+	{ 50000000,  75000000  },
+	{ 75000000,  100000000 },
+	{ 100000000, 125000000 },
+};
+
+enum vco_freq_range {
+	VCO_LOW       = 700000000U,
+	VCO_MID       = 1200000000U,
+	VCO_HIGH      = 2200000000U,
+	VCO_HIGH_HIGH = 3100000000U,
+	VCO_MAX       = 4000000000U,
+};
+
+struct iproc_pll {
+	struct clk_hw hw;
+	void __iomem *pll_base;
+	void __iomem *pwr_base;
+	void __iomem *asiu_base;
+	struct clk_onecell_data clk_data;
+	const char *name;
+	const struct iproc_pll_ctrl *ctrl;
+	const struct iproc_pll_vco_freq_param *vco_param;
+	unsigned int num_vco_entries;
+	unsigned long rate;
+};
+
+#define to_iproc_pll(hw) container_of(hw, struct iproc_pll, hw)
+
+/*
+ * Get the clock rate based on name
+ */
+static unsigned long __get_rate(const char *clk_name)
+{
+	struct clk *clk;
+
+	clk = __clk_lookup(clk_name);
+	if (!clk) {
+		pr_err("%s: unable to find clock by name: %s\n", __func__,
+				clk_name);
+		return 0;
+	}
+
+	return clk_get_rate(clk);
+}
+
+/*
+ * Based on the target frequency, find a match from the VCO frequency parameter
+ * table and return its index
+ */
+static int pll_get_rate_index(struct iproc_pll *pll, unsigned int target_rate)
+{
+	int i;
+
+	for (i = 0; i < pll->num_vco_entries; i++)
+		if (target_rate == pll->vco_param[i].rate)
+			break;
+
+	if (i >= pll->num_vco_entries)
+		return -EINVAL;
+
+	return i;
+}
+
+static int get_kp(unsigned long ref_freq, enum kp_band kp_index)
+{
+	int i;
+
+	if (ref_freq < ref_freq_table[0][0])
+		return -EINVAL;
+
+	for (i = 0; i < NUM_FREQ_BANDS; i++) {
+		if (ref_freq >= ref_freq_table[i][0] &&
+			ref_freq < ref_freq_table[i][1])
+			return kp_table[kp_index][i];
+	}
+	return -EINVAL;
+}
+
+static int pll_wait_for_lock(struct iproc_pll *pll)
+{
+	int i;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+
+	for (i = 0; i < LOCK_DELAY; i++) {
+		u32 val = readl(pll->pll_base + ctrl->status.offset);
+
+		if (val & (1 << ctrl->status.shift))
+			return 0;
+		udelay(10);
+	}
+
+	return -EIO;
+}
+
+static void __pll_disable(struct iproc_pll *pll)
+{
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		val = readl(pll->asiu_base + ctrl->asiu.offset);
+		val &= ~(1 << ctrl->asiu.en_shift);
+		writel(val, pll->asiu_base + ctrl->asiu.offset);
+	}
+
+	/* latch input value so core power can be shut down */
+	val = readl(pll->pwr_base + ctrl->aon.offset);
+	val |= (1 << ctrl->aon.iso_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+
+	/* power down the core */
+	val &= ~(bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+}
+
+static int __pll_enable(struct iproc_pll *pll)
+{
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+
+	/* power up the PLL and make sure it's not latched */
+	val = readl(pll->pwr_base + ctrl->aon.offset);
+	val |= bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift;
+	val &= ~(1 << ctrl->aon.iso_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+
+	/* certain PLLs also need to be ungated from the ASIU top level */
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		val = readl(pll->asiu_base + ctrl->asiu.offset);
+		val |= (1 << ctrl->asiu.en_shift);
+		writel(val, pll->asiu_base + ctrl->asiu.offset);
+	}
+
+	return 0;
+}
+
+static void __pll_put_in_reset(struct iproc_pll *pll)
+{
+	u32 val;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
+
+	val = readl(pll->pll_base + reset->offset);
+	val &= ~(1 << reset->reset_shift | 1 << reset->p_reset_shift);
+	writel(val, pll->pll_base + reset->offset);
+}
+
+static void __pll_bring_out_reset(struct iproc_pll *pll, unsigned int kp,
+		unsigned int ka, unsigned int ki)
+{
+	u32 val;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
+
+	val = readl(pll->pll_base + reset->offset);
+	val &= ~(bit_mask(reset->ki_width) << reset->ki_shift |
+		bit_mask(reset->kp_width) << reset->kp_shift |
+		bit_mask(reset->ka_width) << reset->ka_shift);
+	val |=  ki << reset->ki_shift | kp << reset->kp_shift |
+		ka << reset->ka_shift;
+	val |= 1 << reset->reset_shift | 1 << reset->p_reset_shift;
+	writel(val, pll->pll_base + reset->offset);
+}
+
+static int pll_set_rate(struct iproc_pll *pll, unsigned int rate_index,
+		unsigned long parent_rate)
+{
+	const struct iproc_pll_vco_freq_param *vco =
+				&pll->vco_param[rate_index];
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	int ka = 0, ki, kp, ret;
+	unsigned long rate = vco->rate;
+	u32 val;
+	enum kp_band kp_index;
+	unsigned long ref_freq;
+
+	/*
+	 * reference frequency = parent frequency / PDIV
+	 * If PDIV = 0, then it becomes a multiplier (x2)
+	 */
+	if (vco->pdiv == 0)
+		ref_freq = parent_rate * 2;
+	else
+		ref_freq = parent_rate / vco->pdiv;
+
+	/* determine Ki and Kp index based on target VCO frequency */
+	if (rate >= VCO_LOW && rate < VCO_HIGH) {
+		ki = 4;
+		kp_index = KP_BAND_MID;
+	} else if (rate >= VCO_HIGH && rate && rate < VCO_HIGH_HIGH) {
+		ki = 3;
+		kp_index = KP_BAND_HIGH;
+	} else if (rate >= VCO_HIGH_HIGH && rate < VCO_MAX) {
+		ki = 3;
+		kp_index = KP_BAND_HIGH_HIGH;
+	} else {
+		pr_err("%s: pll: %s has invalid rate: %lu\n", __func__,
+				pll->name, rate);
+		return -EINVAL;
+	}
+
+	kp = get_kp(ref_freq, kp_index);
+	if (kp < 0) {
+		pr_err("%s: pll: %s has invalid kp\n", __func__, pll->name);
+		return kp;
+	}
+
+	ret = __pll_enable(pll);
+	if (ret) {
+		pr_err("%s: pll: %s fails to enable\n", __func__, pll->name);
+		return ret;
+	}
+
+	/* put PLL in reset */
+	__pll_put_in_reset(pll);
+
+	writel(0, pll->pll_base + ctrl->vco_ctrl.u_offset);
+	val = readl(pll->pll_base + ctrl->vco_ctrl.l_offset);
+
+	if (rate >= VCO_LOW && rate < VCO_MID)
+		val |= (1 << PLL_VCO_LOW_SHIFT);
+
+	if (rate < VCO_HIGH)
+		val &= ~(1 << PLL_VCO_HIGH_SHIFT);
+	else
+		val |= (1 << PLL_VCO_HIGH_SHIFT);
+
+	writel(val, pll->pll_base + ctrl->vco_ctrl.l_offset);
+
+	/* program integer part of NDIV */
+	val = readl(pll->pll_base + ctrl->ndiv_int.offset);
+	val &= ~(bit_mask(ctrl->ndiv_int.width) << ctrl->ndiv_int.shift);
+	val |= vco->ndiv_int << ctrl->ndiv_int.shift;
+	writel(val, pll->pll_base + ctrl->ndiv_int.offset);
+
+	/* program fractional part of NDIV */
+	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
+		val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
+		val &= ~(bit_mask(ctrl->ndiv_frac.width) <<
+				ctrl->ndiv_frac.shift);
+		val |= vco->ndiv_frac << ctrl->ndiv_frac.shift;
+		writel(val, pll->pll_base + ctrl->ndiv_frac.offset);
+	}
+
+	/* program PDIV */
+	val = readl(pll->pll_base + ctrl->pdiv.offset);
+	val &= ~(bit_mask(ctrl->pdiv.width) << ctrl->pdiv.shift);
+	val |= vco->pdiv << ctrl->pdiv.shift;
+	writel(val, pll->pll_base + ctrl->pdiv.offset);
+
+	__pll_bring_out_reset(pll, kp, ka, ki);
+
+	ret = pll_wait_for_lock(pll);
+	if (ret < 0) {
+		pr_err("%s: pll: %s failed to lock\n", __func__, pll->name);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int iproc_pll_enable(struct clk_hw *hw)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+
+	return __pll_enable(pll);
+}
+
+static void iproc_pll_disable(struct clk_hw *hw)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+
+	if (ctrl->flags & IPROC_CLK_AON)
+		return;
+
+	__pll_disable(pll);
+}
+
+static unsigned long iproc_pll_recalc_rate(struct clk_hw *hw,
+	unsigned long parent_rate)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+	u64 ndiv;
+	unsigned int ndiv_int, ndiv_frac, pdiv;
+
+	if (parent_rate == 0)
+		return 0;
+
+	/* PLL needs to be locked */
+	val = readl(pll->pll_base + ctrl->status.offset);
+	if ((val & (1 << ctrl->status.shift)) == 0) {
+		pll->rate = 0;
+		return 0;
+	}
+
+	/*
+	 * PLL output frequency =
+	 *
+	 * ((ndiv_int + ndiv_frac / 2^20) * (parent clock rate / pdiv)
+	 */
+	val = readl(pll->pll_base + ctrl->ndiv_int.offset);
+	ndiv_int = (val >> ctrl->ndiv_int.shift) &
+		bit_mask(ctrl->ndiv_int.width);
+	ndiv = ndiv_int << ctrl->ndiv_int.shift;
+
+	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
+		val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
+		ndiv_frac = (val >> ctrl->ndiv_frac.shift) &
+			bit_mask(ctrl->ndiv_frac.width);
+
+		if (ndiv_frac != 0)
+			ndiv = (ndiv_int << ctrl->ndiv_int.shift) | ndiv_frac;
+	}
+
+	val = readl(pll->pll_base + ctrl->pdiv.offset);
+	pdiv = (val >> ctrl->pdiv.shift) & bit_mask(ctrl->pdiv.width);
+
+	pll->rate = (ndiv * parent_rate) >> ctrl->ndiv_int.shift;
+
+	if (pdiv == 0)
+		pll->rate *= 2;
+	else
+		pll->rate /= pdiv;
+
+	return pll->rate;
+}
+
+static const struct clk_ops iproc_pll_ops = {
+	.enable = iproc_pll_enable,
+	.disable = iproc_pll_disable,
+	.recalc_rate = iproc_pll_recalc_rate,
+};
+
+void __init iproc_pll_setup(struct device_node *node,
+		const struct iproc_pll_ctrl *ctrl,
+		const struct iproc_pll_vco_freq_param *vco_param,
+		unsigned int num_vco_entries)
+{
+	int ret;
+	struct clk *clk;
+	struct iproc_pll *pll;
+	struct clk_init_data init;
+	const char *parent_name;
+	unsigned int rate;
+
+	if (WARN_ON(!ctrl))
+		return;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->pll_base = of_iomap(node, 0);
+	if (WARN_ON(!pll->pll_base))
+		goto err_pll_iomap;
+
+	pll->pwr_base = of_iomap(node, 1);
+	if (WARN_ON(!pll->pwr_base))
+		goto err_pwr_iomap;
+
+	/* some PLLs require gating control at the top ASIU level */
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		pll->asiu_base = of_iomap(node, 2);
+		if (WARN_ON(!pll->asiu_base))
+			goto err_asiu_iomap;
+	}
+
+	pll->ctrl = ctrl;
+	pll->name = node->name;
+	init.name = node->name;
+	init.ops = &iproc_pll_ops;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	pll->hw.init = &init;
+
+	/* configure the PLL to the desired VCO frequency if specified */
+	ret = of_property_read_u32(node, "clock-frequency", &rate);
+	if (!ret) {
+		unsigned long parent_rate;
+		int rate_index;
+
+		if (WARN_ON(!vco_param))
+			goto err_clk_register;
+
+		pll->num_vco_entries = num_vco_entries;
+		pll->vco_param = vco_param;
+
+		parent_rate = __get_rate(parent_name);
+		if (WARN_ON(!parent_rate))
+			goto err_clk_register;
+
+		rate_index = pll_get_rate_index(pll, rate);
+		if (WARN_ON(rate_index < 0))
+			goto err_clk_register;
+
+		ret = pll_set_rate(pll, rate_index, parent_rate);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+	}
+
+	clk = clk_register(NULL, &pll->hw);
+	if (WARN_ON(IS_ERR(clk)))
+		goto err_clk_register;
+
+	pll->clk_data.clk_num = 1;
+	pll->clk_data.clks = &clk;
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get,
+			&pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_add;
+
+	return;
+
+err_clk_add:
+	clk_unregister(clk);
+err_clk_register:
+	if (pll->asiu_base)
+		iounmap(pll->asiu_base);
+err_asiu_iomap:
+	iounmap(pll->pwr_base);
+err_pwr_iomap:
+	iounmap(pll->pll_base);
+err_pll_iomap:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc.h b/drivers/clk/bcm/clk-iproc.h
new file mode 100644
index 0000000..4aa0479
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc.h
@@ -0,0 +1,155 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _CLK_IPROC_H
+#define _CLK_IPROC_H
+
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/of.h>
+#include <linux/clk-provider.h>
+
+#define IPROC_CLK_NAME_LEN 25
+#define IPROC_CLK_INVALID_OFFSET 0xffffffff
+#define bit_mask(width) ((1 << (width)) - 1)
+
+/* clock should not be disabled at runtime */
+#define IPROC_CLK_AON BIT(0)
+
+/* PLL requires gating through ASIU */
+#define IPROC_CLK_PLL_ASIU BIT(1)
+
+/* PLL has fractional part of the NDIV */
+#define IPROC_CLK_PLL_HAS_NDIV_FRAC BIT(2)
+
+/*
+ * Parameters for VCO frequency configuration
+ *
+ * VCO frequency =
+ * ((ndiv_int + ndiv_frac / 2^20) * (ref freqeuncy  / pdiv)
+ */
+struct iproc_pll_vco_freq_param {
+	unsigned long rate;
+	unsigned int ndiv_int;
+	unsigned int ndiv_frac;
+	unsigned int pdiv;
+};
+
+struct iproc_clk_reg_op {
+	unsigned int offset;
+	unsigned int shift;
+	unsigned int width;
+};
+
+/*
+ * Clock gating control at the top ASIU level
+ */
+struct iproc_asiu_gate {
+	unsigned int offset;
+	unsigned int en_shift;
+};
+
+/*
+ * Control of powering on/off of a PLL
+ *
+ * Before powering off a PLL, input isolation (ISO) needs to be enabled
+ */
+struct iproc_pll_aon_pwr_ctrl {
+	unsigned int offset;
+	unsigned int pwr_width;
+	unsigned int pwr_shift;
+	unsigned int iso_shift;
+};
+
+/*
+ * Control of the PLL reset, with Ki, Kp, and Ka parameters
+ */
+struct iproc_pll_reset_ctrl {
+	unsigned int offset;
+	unsigned int reset_shift;
+	unsigned int p_reset_shift;
+	unsigned int ki_shift;
+	unsigned int ki_width;
+	unsigned int kp_shift;
+	unsigned int kp_width;
+	unsigned int ka_shift;
+	unsigned int ka_width;
+};
+
+struct iproc_pll_vco_ctrl {
+	unsigned int u_offset;
+	unsigned int l_offset;
+};
+
+/*
+ * Main PLL control parameters
+ */
+struct iproc_pll_ctrl {
+	unsigned long flags;
+	struct iproc_pll_aon_pwr_ctrl aon;
+	struct iproc_asiu_gate asiu;
+	struct iproc_pll_reset_ctrl reset;
+	struct iproc_clk_reg_op ndiv_int;
+	struct iproc_clk_reg_op ndiv_frac;
+	struct iproc_clk_reg_op pdiv;
+	struct iproc_pll_vco_ctrl vco_ctrl;
+	struct iproc_clk_reg_op status;
+};
+
+/*
+ * Controls enabling/disabling a PLL derived clock
+ */
+struct iproc_clk_enable_ctrl {
+	unsigned int offset;
+	unsigned int enable_shift;
+	unsigned int hold_shift;
+	unsigned int bypass_shift;
+};
+
+/*
+ * Main clock control parameters for clocks derived from the PLLs
+ */
+struct iproc_clk_ctrl {
+	unsigned int channel;
+	unsigned long flags;
+	struct iproc_clk_enable_ctrl enable;
+	struct iproc_clk_reg_op mdiv;
+};
+
+/*
+ * Divisor of the ASIU clocks
+ */
+struct iproc_asiu_div {
+	unsigned int offset;
+	unsigned int en_shift;
+	unsigned int high_shift;
+	unsigned int high_width;
+	unsigned int low_shift;
+	unsigned int low_width;
+};
+
+extern void __init iproc_armpll_setup(struct device_node *node);
+extern void __init iproc_pll_setup(struct device_node *node,
+		const struct iproc_pll_ctrl *ctrl,
+		const struct iproc_pll_vco_freq_param *vco_param,
+		unsigned int num_freqs);
+extern void __init iproc_clk_setup(struct device_node *node,
+		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks);
+extern void __init iproc_asiu_setup(struct device_node *node,
+		const struct iproc_asiu_div *div,
+		const struct iproc_asiu_gate *gate, unsigned int num_clks);
+
+#endif /* _CLK_IPROC_H */
-- 
1.7.9.5

[PATCH 2/4] clk: iproc: add initial common clock support

[Ray Jui]

This adds basic and generic support for various iProc PLLs and clocks
including the ARMPLL, GENPLL, LCPLL, MIPIPLL, and ASIU clocks.

SoCs under the iProc architecture can define their specific register
offsets and clock parameters for their PLL and clock controllers. These
parameters can be passed as arugments into the generic iProc PLL and
clock setup functions

Derived from code originally provided by Jonathan Richardson
<jonathar@broadcom.com>

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/clk/Makefile               |    2 +-
 drivers/clk/bcm/Kconfig            |    9 +
 drivers/clk/bcm/Makefile           |    1 +
 drivers/clk/bcm/clk-iproc-armpll.c |  286 +++++++++++++++++++++
 drivers/clk/bcm/clk-iproc-asiu.c   |  275 ++++++++++++++++++++
 drivers/clk/bcm/clk-iproc-clk.c    |  238 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-pll.c    |  483 ++++++++++++++++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc.h        |  155 ++++++++++++
 8 files changed, 1448 insertions(+), 1 deletion(-)
 create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
 create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
 create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
 create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
 create mode 100644 drivers/clk/bcm/clk-iproc.h

diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index d5fba5b..eff0213 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -41,7 +41,7 @@ obj-$(CONFIG_ARCH_VT8500)		+= clk-vt8500.o
 obj-$(CONFIG_COMMON_CLK_WM831X)		+= clk-wm831x.o
 obj-$(CONFIG_COMMON_CLK_XGENE)		+= clk-xgene.o
 obj-$(CONFIG_COMMON_CLK_AT91)		+= at91/
-obj-$(CONFIG_ARCH_BCM_MOBILE)		+= bcm/
+obj-$(CONFIG_ARCH_BCM)			+= bcm/
 obj-$(CONFIG_ARCH_BERLIN)		+= berlin/
 obj-$(CONFIG_ARCH_HI3xxx)		+= hisilicon/
 obj-$(CONFIG_ARCH_HIP04)		+= hisilicon/
diff --git a/drivers/clk/bcm/Kconfig b/drivers/clk/bcm/Kconfig
index 75506e5..66b5b7f 100644
--- a/drivers/clk/bcm/Kconfig
+++ b/drivers/clk/bcm/Kconfig
@@ -7,3 +7,12 @@ config CLK_BCM_KONA
 	  Enable common clock framework support for Broadcom SoCs
 	  using "Kona" style clock control units, including those
 	  in the BCM281xx and BCM21664 families.
+
+config COMMON_CLK_IPROC
+	bool "Broadcom iProc clock support"
+	depends on ARCH_BCM_IPROC
+	depends on COMMON_CLK
+	default y
+	help
+	  Enable common clock framework support for Broadcom SoCs
+	  based on the "iProc" architecture
diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
index 6297d05..6926636 100644
--- a/drivers/clk/bcm/Makefile
+++ b/drivers/clk/bcm/Makefile
@@ -2,3 +2,4 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
+obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
diff --git a/drivers/clk/bcm/clk-iproc-armpll.c b/drivers/clk/bcm/clk-iproc-armpll.c
new file mode 100644
index 0000000..ec9b130
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-armpll.c
@@ -0,0 +1,286 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+
+#define IPROC_CLK_MAX_FREQ_POLICY                    0x3
+#define IPROC_CLK_POLICY_FREQ_OFFSET                 0x008
+#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT      8
+#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK       0x7
+
+#define IPROC_CLK_PLLARMA_OFFSET                     0xc00
+#define IPROC_CLK_PLLARMA_LOCK_SHIFT                 28
+#define IPROC_CLK_PLLARMA_PDIV_SHIFT                 24
+#define IPROC_CLK_PLLARMA_PDIV_MASK                  0xf
+#define IPROC_CLK_PLLARMA_NDIV_INT_SHIFT             8
+#define IPROC_CLK_PLLARMA_NDIV_INT_MASK              0x3ff
+
+#define IPROC_CLK_PLLARMB_OFFSET                     0xc04
+#define IPROC_CLK_PLLARMB_NDIV_FRAC_MASK             0xfffff
+
+#define IPROC_CLK_PLLARMC_OFFSET                     0xc08
+#define IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT            8
+#define IPROC_CLK_PLLARMC_MDIV_MASK                  0xff
+
+#define IPROC_CLK_PLLARMCTL5_OFFSET                  0xc20
+#define IPROC_CLK_PLLARMCTL5_H_MDIV_MASK             0xff
+
+#define IPROC_CLK_PLLARM_OFFSET_OFFSET               0xc24
+#define IPROC_CLK_PLLARM_SW_CTL_SHIFT                29
+#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT       20
+#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK        0xff
+#define IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK       0xfffff
+
+#define IPROC_CLK_ARM_DIV_OFFSET                     0xe00
+#define IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT  4
+#define IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK        0xf
+
+#define IPROC_CLK_POLICY_DBG_OFFSET                  0xec0
+#define IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT          12
+#define IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK           0x7
+
+enum iproc_arm_pll_fid {
+	ARM_PLL_FID_CRYSTAL_CLK   = 0,
+	ARM_PLL_FID_SYS_CLK       = 2,
+	ARM_PLL_FID_CH0_SLOW_CLK  = 6,
+	ARM_PLL_FID_CH1_FAST_CLK  = 7
+};
+
+struct iproc_arm_pll {
+	struct clk_hw hw;
+	void __iomem *base;
+	struct clk_onecell_data clk_data;
+	unsigned long rate;
+};
+
+#define to_iproc_arm_pll(hw) container_of(hw, struct iproc_arm_pll, hw)
+
+static unsigned int __get_fid(struct iproc_arm_pll *pll)
+{
+	u32 val;
+	unsigned int policy, fid, active_fid;
+
+	val = readl(pll->base + IPROC_CLK_ARM_DIV_OFFSET);
+	if (val & (1 << IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT))
+		policy = val & IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK;
+	else
+		policy = 0;
+
+	/* something is seriously wrong */
+	BUG_ON(policy > IPROC_CLK_MAX_FREQ_POLICY);
+
+	val = readl(pll->base + IPROC_CLK_POLICY_FREQ_OFFSET);
+	fid = (val >> (IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT * policy)) &
+		IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK;
+
+	val = readl(pll->base + IPROC_CLK_POLICY_DBG_OFFSET);
+	active_fid = IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK &
+		(val >> IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT);
+	if (fid != active_fid) {
+		pr_debug("%s: fid override %u->%u\n", __func__,	fid,
+				active_fid);
+		fid = active_fid;
+	}
+
+	pr_debug("%s: active fid: %u\n", __func__, fid);
+
+	return fid;
+}
+
+/*
+ * Determine the mdiv (post divider) based on the frequency ID being used.
+ * There are 4 sources that can be used to derive the output clock rate:
+ *    - 25 MHz Crystal
+ *    - System clock
+ *    - PLL channel 0 (slow clock)
+ *    - PLL channel 1 (fast clock)
+ */
+static int __get_mdiv(struct iproc_arm_pll *pll)
+{
+	unsigned int fid;
+	int mdiv;
+	u32 val;
+
+	fid = __get_fid(pll);
+
+	switch (fid) {
+	case ARM_PLL_FID_CRYSTAL_CLK:
+	case ARM_PLL_FID_SYS_CLK:
+		mdiv = 1;
+		break;
+
+	case ARM_PLL_FID_CH0_SLOW_CLK:
+		val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
+		mdiv = val & IPROC_CLK_PLLARMC_MDIV_MASK;
+		if (mdiv == 0)
+			mdiv = 256;
+		break;
+
+	case ARM_PLL_FID_CH1_FAST_CLK:
+		val = readl(pll->base +	IPROC_CLK_PLLARMCTL5_OFFSET);
+		mdiv = val & IPROC_CLK_PLLARMCTL5_H_MDIV_MASK;
+		if (mdiv == 0)
+			mdiv = 256;
+		break;
+
+	default:
+		mdiv = -EFAULT;
+	}
+
+	return mdiv;
+}
+
+static unsigned int __get_ndiv(struct iproc_arm_pll *pll)
+{
+	u32 val;
+	unsigned int ndiv_int, ndiv_frac, ndiv;
+
+	val = readl(pll->base + IPROC_CLK_PLLARM_OFFSET_OFFSET);
+	if (val & (1 << IPROC_CLK_PLLARM_SW_CTL_SHIFT)) {
+		/*
+		 * offset mode is active. Read the ndiv from the PLLARM OFFSET
+		 * register
+		 */
+		ndiv_int = (val >> IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT) &
+			IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK;
+		if (ndiv_int == 0)
+			ndiv_int = 256;
+
+		ndiv_frac = val & IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK;
+	} else {
+		/* offset mode not active */
+		val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
+		ndiv_int = (val >> IPROC_CLK_PLLARMA_NDIV_INT_SHIFT) &
+			IPROC_CLK_PLLARMA_NDIV_INT_MASK;
+		if (ndiv_int == 0)
+			ndiv_int = 1024;
+
+		val = readl(pll->base + IPROC_CLK_PLLARMB_OFFSET);
+		ndiv_frac = val & IPROC_CLK_PLLARMB_NDIV_FRAC_MASK;
+	}
+
+	ndiv = (ndiv_int << 20) | ndiv_frac;
+
+	return ndiv;
+}
+
+/*
+ * The output frequency of the ARM PLL is calculated based on the ARM PLL
+ * divider values:
+ *   pdiv = ARM PLL pre-divider
+ *   ndiv = ARM PLL multiplier
+ *   mdiv = ARM PLL post divider
+ *
+ * The frequency is calculated by:
+ *   ((ndiv * parent clock rate) / pdiv) / mdiv
+ */
+static unsigned long iproc_arm_pll_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_arm_pll *pll = to_iproc_arm_pll(hw);
+	u32 val;
+	int mdiv;
+	u64 ndiv;
+	unsigned int pdiv;
+
+	/* in bypass mode, use parent rate */
+	val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
+	if (val & (1 << IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT)) {
+		pll->rate = parent_rate;
+		return pll->rate;
+	}
+
+	/* PLL needs to be locked */
+	val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
+	if (!(val & (1 << IPROC_CLK_PLLARMA_LOCK_SHIFT))) {
+		pll->rate = 0;
+		return 0;
+	}
+
+	pdiv = (val >> IPROC_CLK_PLLARMA_PDIV_SHIFT) &
+		IPROC_CLK_PLLARMA_PDIV_MASK;
+	if (pdiv == 0)
+		pdiv = 16;
+
+	ndiv = __get_ndiv(pll);
+	mdiv = __get_mdiv(pll);
+	if (mdiv <= 0) {
+		pll->rate = 0;
+		return 0;
+	}
+	pll->rate = (ndiv * parent_rate) >> 20;
+	pll->rate = (pll->rate / pdiv) / mdiv;
+
+	pr_debug("%s: ARM PLL rate: %lu. parent rate: %lu\n", __func__,
+			pll->rate, parent_rate);
+	pr_debug("%s: ndiv_int: %u, pdiv: %u, mdiv: %d\n", __func__,
+			(unsigned int)(ndiv >> 20), pdiv, mdiv);
+
+	return pll->rate;
+}
+
+static const struct clk_ops iproc_arm_pll_ops = {
+	.recalc_rate = iproc_arm_pll_recalc_rate,
+};
+
+void __init iproc_armpll_setup(struct device_node *node)
+{
+	int ret;
+	struct clk *clk;
+	struct iproc_arm_pll *pll;
+	struct clk_init_data init;
+	const char *parent_name;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->base = of_iomap(node, 0);
+	if (WARN_ON(!pll->base))
+		goto err_free_pll;
+
+	init.name = node->name;
+	init.ops = &iproc_arm_pll_ops;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	pll->hw.init = &init;
+
+	clk = clk_register(NULL, &pll->hw);
+	if (WARN_ON(IS_ERR(clk)))
+		goto err_iounmap;
+
+	pll->clk_data.clk_num = 1;
+	pll->clk_data.clks = &clk;
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_unregister;
+
+	return;
+
+err_clk_unregister:
+	clk_unregister(clk);
+err_iounmap:
+	iounmap(pll->base);
+err_free_pll:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc-asiu.c b/drivers/clk/bcm/clk-iproc-asiu.c
new file mode 100644
index 0000000..ab86b8c
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-asiu.c
@@ -0,0 +1,275 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+struct iproc_asiu;
+
+struct iproc_asiu_clk {
+	struct clk_hw hw;
+	const char *name;
+	struct iproc_asiu *asiu;
+	unsigned long rate;
+	struct iproc_asiu_div div;
+	struct iproc_asiu_gate gate;
+};
+
+struct iproc_asiu {
+	void __iomem *div_base;
+	void __iomem *gate_base;
+
+	struct clk_onecell_data clk_data;
+	struct iproc_asiu_clk *clks;
+};
+
+#define to_asiu_clk(hw) container_of(hw, struct iproc_asiu_clk, hw)
+
+static int iproc_asiu_clk_enable(struct clk_hw *hw)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+
+	/* some clocks at the ASIU level are always enabled */
+	if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
+		return 0;
+
+	val = readl(asiu->gate_base + clk->gate.offset);
+	val |= (1 << clk->gate.en_shift);
+	writel(val, asiu->gate_base + clk->gate.offset);
+
+	return 0;
+}
+
+static void iproc_asiu_clk_disable(struct clk_hw *hw)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+
+	/* some clocks at the ASIU level are always enabled */
+	if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
+		return;
+
+	val = readl(asiu->gate_base + clk->gate.offset);
+	val &= ~(1 << clk->gate.en_shift);
+	writel(val, asiu->gate_base + clk->gate.offset);
+}
+
+static unsigned long iproc_asiu_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+	unsigned int div_h, div_l;
+
+	if (parent_rate == 0) {
+		clk->rate = 0;
+		return 0;
+	}
+
+	/* if clock divisor is not enabled, simply return parent rate */
+	val = readl(asiu->div_base + clk->div.offset);
+	if ((val & (1 << clk->div.en_shift)) == 0) {
+		clk->rate = parent_rate;
+		return parent_rate;
+	}
+
+	/* clock rate = parent rate / (high_div + 1) + (low_div + 1) */
+	div_h = (val >> clk->div.high_shift) & bit_mask(clk->div.high_width);
+	div_h++;
+	div_l = (val >> clk->div.low_shift) & bit_mask(clk->div.low_width);
+	div_l++;
+
+	clk->rate = parent_rate / (div_h + div_l);
+	pr_debug("%s: rate: %lu. parent rate: %lu div_h: %u div_l: %u\n",
+		__func__, clk->rate, parent_rate, div_h, div_l);
+
+	return clk->rate;
+}
+
+static long iproc_asiu_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	unsigned int div;
+
+	if (rate == 0 || *parent_rate == 0)
+		return -EINVAL;
+
+	if (rate == *parent_rate)
+		return *parent_rate;
+
+	div = DIV_ROUND_UP(*parent_rate, rate);
+	if (div < 2)
+		return *parent_rate;
+
+	return *parent_rate / div;
+}
+
+static int iproc_asiu_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	unsigned int div, div_h, div_l;
+	u32 val;
+
+	if (rate == 0 || parent_rate == 0)
+		return -EINVAL;
+
+	/* simply disable the divisor if one wants the same rate as parent */
+	if (rate == parent_rate) {
+		val = readl(asiu->div_base + clk->div.offset);
+		val &= ~(1 << clk->div.en_shift);
+		writel(val, asiu->div_base + clk->div.offset);
+		return 0;
+	}
+
+	div = DIV_ROUND_UP(parent_rate, rate);
+	if (div < 2)
+		return -EINVAL;
+
+	div_h = div_l = div >> 1;
+	div_h--;
+	div_l--;
+
+	val = readl(asiu->div_base + clk->div.offset);
+	val |= 1 << clk->div.en_shift;
+	if (div_h) {
+		val &= ~(bit_mask(clk->div.high_width)
+				<< clk->div.high_shift);
+		val |= div_h << clk->div.high_shift;
+	} else {
+		val &= ~(bit_mask(clk->div.high_width)
+				<< clk->div.high_shift);
+	}
+	if (div_l) {
+		val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
+		val |= div_l << clk->div.low_shift;
+	} else {
+		val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
+	}
+	writel(val, asiu->div_base + clk->div.offset);
+
+	return 0;
+}
+
+static const struct clk_ops iproc_asiu_ops = {
+	.enable = iproc_asiu_clk_enable,
+	.disable = iproc_asiu_clk_disable,
+	.recalc_rate = iproc_asiu_clk_recalc_rate,
+	.round_rate = iproc_asiu_clk_round_rate,
+	.set_rate = iproc_asiu_clk_set_rate,
+};
+
+void __init iproc_asiu_setup(struct device_node *node,
+		const struct iproc_asiu_div *div,
+		const struct iproc_asiu_gate *gate, unsigned int num_clks)
+{
+	int i, ret;
+	struct iproc_asiu *asiu;
+
+	if (WARN_ON(!gate || !div))
+		return;
+
+	asiu = kzalloc(sizeof(*asiu), GFP_KERNEL);
+	if (WARN_ON(!asiu))
+		return;
+
+	asiu->clk_data.clk_num = num_clks;
+	asiu->clk_data.clks = kcalloc(num_clks, sizeof(*asiu->clk_data.clks),
+			GFP_KERNEL);
+	if (WARN_ON(!asiu->clk_data.clks))
+		goto err_clks;
+
+	asiu->clks = kcalloc(num_clks, sizeof(*asiu->clks), GFP_KERNEL);
+	if (WARN_ON(!asiu->clks))
+		goto err_asiu_clks;
+
+	asiu->div_base = of_iomap(node, 0);
+	if (WARN_ON(!asiu->div_base))
+		goto err_iomap_div;
+
+	asiu->gate_base = of_iomap(node, 1);
+	if (WARN_ON(!asiu->gate_base))
+		goto err_iomap_gate;
+
+	for (i = 0; i < num_clks; i++) {
+		struct clk_init_data init;
+		struct clk *clk;
+		const char *parent_name;
+		struct iproc_asiu_clk *asiu_clk;
+		const char *clk_name;
+
+		clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
+		if (WARN_ON(!clk_name))
+			goto err_clk_register;
+
+		ret = of_property_read_string_index(node, "clock-output-names",
+				i, &clk_name);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+
+		asiu_clk = &asiu->clks[i];
+		asiu_clk->name = clk_name;
+		asiu_clk->asiu = asiu;
+		asiu_clk->div = div[i];
+		asiu_clk->gate = gate[i];
+		init.name = clk_name;
+		init.ops = &iproc_asiu_ops;
+		init.flags = 0;
+		parent_name = of_clk_get_parent_name(node, 0);
+		init.parent_names = (parent_name ? &parent_name : NULL);
+		init.num_parents = (parent_name ? 1 : 0);
+		asiu_clk->hw.init = &init;
+
+		clk = clk_register(NULL, &asiu_clk->hw);
+		if (WARN_ON(IS_ERR(clk)))
+			goto err_clk_register;
+		asiu->clk_data.clks[i] = clk;
+	}
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get,
+			&asiu->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_register;
+
+	return;
+
+err_clk_register:
+	for (i = 0; i < num_clks; i++)
+		kfree(asiu->clks[i].name);
+	iounmap(asiu->gate_base);
+
+err_iomap_gate:
+	iounmap(asiu->div_base);
+
+err_iomap_div:
+	kfree(asiu->clks);
+
+err_asiu_clks:
+	kfree(asiu->clk_data.clks);
+
+err_clks:
+	kfree(asiu);
+}
diff --git a/drivers/clk/bcm/clk-iproc-clk.c b/drivers/clk/bcm/clk-iproc-clk.c
new file mode 100644
index 0000000..be3c42c
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-clk.c
@@ -0,0 +1,238 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+struct iproc_pll;
+
+struct iproc_clk {
+	struct clk_hw hw;
+	const char *name;
+	struct iproc_pll *pll;
+	unsigned long rate;
+	const struct iproc_clk_ctrl *ctrl;
+};
+
+struct iproc_pll {
+	void __iomem *base;
+	struct clk_onecell_data clk_data;
+	struct iproc_clk *clks;
+};
+
+#define to_iproc_clk(hw) container_of(hw, struct iproc_clk, hw)
+
+static int iproc_clk_enable(struct clk_hw *hw)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+
+	/* channel enable is active low */
+	val = readl(pll->base + ctrl->enable.offset);
+	val &= ~(1 << ctrl->enable.enable_shift);
+	writel(val, pll->base + ctrl->enable.offset);
+
+	/* also make sure channel is not held */
+	val = readl(pll->base + ctrl->enable.offset);
+	val &= ~(1 << ctrl->enable.hold_shift);
+	writel(val, pll->base + ctrl->enable.offset);
+
+	return 0;
+}
+
+static void iproc_clk_disable(struct clk_hw *hw)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+
+	if (ctrl->flags & IPROC_CLK_AON)
+		return;
+
+	val = readl(pll->base + ctrl->enable.offset);
+	val |= 1 << ctrl->enable.enable_shift;
+	writel(val, pll->base + ctrl->enable.offset);
+}
+
+static unsigned long iproc_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+	unsigned int mdiv;
+
+	if (parent_rate == 0)
+		return 0;
+
+	val = readl(pll->base + ctrl->mdiv.offset);
+	mdiv = (val >> ctrl->mdiv.shift) & bit_mask(ctrl->mdiv.width);
+	if (mdiv == 0)
+		mdiv = 256;
+
+	clk->rate = parent_rate / mdiv;
+
+	return clk->rate;
+}
+
+static long iproc_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	unsigned int div;
+
+	if (rate == 0 || *parent_rate == 0)
+		return -EINVAL;
+
+	if (rate == *parent_rate)
+		return *parent_rate;
+
+	div = DIV_ROUND_UP(*parent_rate, rate);
+	if (div < 2)
+		return *parent_rate;
+
+	if (div > 256)
+		div = 256;
+
+	return *parent_rate / div;
+}
+
+static int iproc_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+	unsigned int div;
+
+	if (rate == 0 || parent_rate == 0)
+		return -EINVAL;
+
+	div = DIV_ROUND_UP(parent_rate, rate);
+	if (div > 256)
+		return -EINVAL;
+
+	val = readl(pll->base + ctrl->mdiv.offset);
+	if (div == 256) {
+		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
+	} else {
+		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
+		val |= div << ctrl->mdiv.shift;
+	}
+	writel(val, pll->base + ctrl->mdiv.offset);
+	clk->rate = parent_rate / div;
+
+	return 0;
+}
+
+static const struct clk_ops iproc_clk_ops = {
+	.enable = iproc_clk_enable,
+	.disable = iproc_clk_disable,
+	.recalc_rate = iproc_clk_recalc_rate,
+	.round_rate = iproc_clk_round_rate,
+	.set_rate = iproc_clk_set_rate,
+};
+
+void __init iproc_clk_setup(struct device_node *node,
+		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks)
+{
+	int i, ret;
+	struct iproc_pll *pll;
+
+	if (WARN_ON(!ctrl))
+		return;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->clk_data.clk_num = num_clks;
+	pll->clk_data.clks = kcalloc(num_clks, sizeof(*pll->clk_data.clks),
+			GFP_KERNEL);
+	if (WARN_ON(!pll->clk_data.clks))
+		goto err_clks;
+
+	pll->clks = kcalloc(num_clks, sizeof(*pll->clks), GFP_KERNEL);
+	if (WARN_ON(!pll->clks))
+		goto err_pll_clks;
+
+	pll->base = of_iomap(node, 0);
+	if (WARN_ON(!pll->base))
+		goto err_iomap;
+
+	for (i = 0; i < num_clks; i++) {
+		struct clk_init_data init;
+		struct clk *clk;
+		const char *parent_name;
+		struct iproc_clk *iclk;
+		const char *clk_name;
+
+		clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
+		if (WARN_ON(!clk_name))
+			goto err_clk_register;
+
+		ret = of_property_read_string_index(node, "clock-output-names",
+				i, &clk_name);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+
+		iclk = &pll->clks[i];
+		iclk->name = clk_name;
+		iclk->pll = pll;
+		iclk->ctrl = &ctrl[i];
+		init.name = clk_name;
+		init.ops = &iproc_clk_ops;
+		init.flags = 0;
+		parent_name = of_clk_get_parent_name(node, 0);
+		init.parent_names = (parent_name ? &parent_name : NULL);
+		init.num_parents = (parent_name ? 1 : 0);
+		iclk->hw.init = &init;
+
+		clk = clk_register(NULL, &iclk->hw);
+		if (WARN_ON(IS_ERR(clk)))
+			goto err_clk_register;
+		pll->clk_data.clks[i] = clk;
+	}
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_register;
+
+	return;
+
+err_clk_register:
+	for (i = 0; i < num_clks; i++)
+		kfree(pll->clks[i].name);
+	iounmap(pll->base);
+
+err_iomap:
+	kfree(pll->clks);
+
+err_pll_clks:
+	kfree(pll->clk_data.clks);
+
+err_clks:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc-pll.c b/drivers/clk/bcm/clk-iproc-pll.c
new file mode 100644
index 0000000..cd3bd38
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-pll.c
@@ -0,0 +1,483 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+#define PLL_VCO_HIGH_SHIFT 19
+#define PLL_VCO_LOW_SHIFT  30
+
+/* number of delay loops waiting for PLL to lock */
+#define LOCK_DELAY 100
+
+/* number of VCO frequency bands */
+#define NUM_FREQ_BANDS 8
+
+#define NUM_KP_BANDS 3
+enum kp_band {
+	KP_BAND_MID = 0,
+	KP_BAND_HIGH,
+	KP_BAND_HIGH_HIGH
+};
+
+static const unsigned int kp_table[NUM_KP_BANDS][NUM_FREQ_BANDS] = {
+	{ 5, 6, 6, 7, 7, 8, 9, 10 },
+	{ 4, 4, 5, 5, 6, 7, 8, 9  },
+	{ 4, 5, 5, 6, 7, 8, 9, 10 },
+};
+
+static const unsigned long ref_freq_table[NUM_FREQ_BANDS][2] = {
+	{ 10000000,  12500000  },
+	{ 12500000,  15000000  },
+	{ 15000000,  20000000  },
+	{ 20000000,  25000000  },
+	{ 25000000,  50000000  },
+	{ 50000000,  75000000  },
+	{ 75000000,  100000000 },
+	{ 100000000, 125000000 },
+};
+
+enum vco_freq_range {
+	VCO_LOW       = 700000000U,
+	VCO_MID       = 1200000000U,
+	VCO_HIGH      = 2200000000U,
+	VCO_HIGH_HIGH = 3100000000U,
+	VCO_MAX       = 4000000000U,
+};
+
+struct iproc_pll {
+	struct clk_hw hw;
+	void __iomem *pll_base;
+	void __iomem *pwr_base;
+	void __iomem *asiu_base;
+	struct clk_onecell_data clk_data;
+	const char *name;
+	const struct iproc_pll_ctrl *ctrl;
+	const struct iproc_pll_vco_freq_param *vco_param;
+	unsigned int num_vco_entries;
+	unsigned long rate;
+};
+
+#define to_iproc_pll(hw) container_of(hw, struct iproc_pll, hw)
+
+/*
+ * Get the clock rate based on name
+ */
+static unsigned long __get_rate(const char *clk_name)
+{
+	struct clk *clk;
+
+	clk = __clk_lookup(clk_name);
+	if (!clk) {
+		pr_err("%s: unable to find clock by name: %s\n", __func__,
+				clk_name);
+		return 0;
+	}
+
+	return clk_get_rate(clk);
+}
+
+/*
+ * Based on the target frequency, find a match from the VCO frequency parameter
+ * table and return its index
+ */
+static int pll_get_rate_index(struct iproc_pll *pll, unsigned int target_rate)
+{
+	int i;
+
+	for (i = 0; i < pll->num_vco_entries; i++)
+		if (target_rate == pll->vco_param[i].rate)
+			break;
+
+	if (i >= pll->num_vco_entries)
+		return -EINVAL;
+
+	return i;
+}
+
+static int get_kp(unsigned long ref_freq, enum kp_band kp_index)
+{
+	int i;
+
+	if (ref_freq < ref_freq_table[0][0])
+		return -EINVAL;
+
+	for (i = 0; i < NUM_FREQ_BANDS; i++) {
+		if (ref_freq >= ref_freq_table[i][0] &&
+			ref_freq < ref_freq_table[i][1])
+			return kp_table[kp_index][i];
+	}
+	return -EINVAL;
+}
+
+static int pll_wait_for_lock(struct iproc_pll *pll)
+{
+	int i;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+
+	for (i = 0; i < LOCK_DELAY; i++) {
+		u32 val = readl(pll->pll_base + ctrl->status.offset);
+
+		if (val & (1 << ctrl->status.shift))
+			return 0;
+		udelay(10);
+	}
+
+	return -EIO;
+}
+
+static void __pll_disable(struct iproc_pll *pll)
+{
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		val = readl(pll->asiu_base + ctrl->asiu.offset);
+		val &= ~(1 << ctrl->asiu.en_shift);
+		writel(val, pll->asiu_base + ctrl->asiu.offset);
+	}
+
+	/* latch input value so core power can be shut down */
+	val = readl(pll->pwr_base + ctrl->aon.offset);
+	val |= (1 << ctrl->aon.iso_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+
+	/* power down the core */
+	val &= ~(bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+}
+
+static int __pll_enable(struct iproc_pll *pll)
+{
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+
+	/* power up the PLL and make sure it's not latched */
+	val = readl(pll->pwr_base + ctrl->aon.offset);
+	val |= bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift;
+	val &= ~(1 << ctrl->aon.iso_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+
+	/* certain PLLs also need to be ungated from the ASIU top level */
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		val = readl(pll->asiu_base + ctrl->asiu.offset);
+		val |= (1 << ctrl->asiu.en_shift);
+		writel(val, pll->asiu_base + ctrl->asiu.offset);
+	}
+
+	return 0;
+}
+
+static void __pll_put_in_reset(struct iproc_pll *pll)
+{
+	u32 val;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
+
+	val = readl(pll->pll_base + reset->offset);
+	val &= ~(1 << reset->reset_shift | 1 << reset->p_reset_shift);
+	writel(val, pll->pll_base + reset->offset);
+}
+
+static void __pll_bring_out_reset(struct iproc_pll *pll, unsigned int kp,
+		unsigned int ka, unsigned int ki)
+{
+	u32 val;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
+
+	val = readl(pll->pll_base + reset->offset);
+	val &= ~(bit_mask(reset->ki_width) << reset->ki_shift |
+		bit_mask(reset->kp_width) << reset->kp_shift |
+		bit_mask(reset->ka_width) << reset->ka_shift);
+	val |=  ki << reset->ki_shift | kp << reset->kp_shift |
+		ka << reset->ka_shift;
+	val |= 1 << reset->reset_shift | 1 << reset->p_reset_shift;
+	writel(val, pll->pll_base + reset->offset);
+}
+
+static int pll_set_rate(struct iproc_pll *pll, unsigned int rate_index,
+		unsigned long parent_rate)
+{
+	const struct iproc_pll_vco_freq_param *vco =
+				&pll->vco_param[rate_index];
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	int ka = 0, ki, kp, ret;
+	unsigned long rate = vco->rate;
+	u32 val;
+	enum kp_band kp_index;
+	unsigned long ref_freq;
+
+	/*
+	 * reference frequency = parent frequency / PDIV
+	 * If PDIV = 0, then it becomes a multiplier (x2)
+	 */
+	if (vco->pdiv == 0)
+		ref_freq = parent_rate * 2;
+	else
+		ref_freq = parent_rate / vco->pdiv;
+
+	/* determine Ki and Kp index based on target VCO frequency */
+	if (rate >= VCO_LOW && rate < VCO_HIGH) {
+		ki = 4;
+		kp_index = KP_BAND_MID;
+	} else if (rate >= VCO_HIGH && rate && rate < VCO_HIGH_HIGH) {
+		ki = 3;
+		kp_index = KP_BAND_HIGH;
+	} else if (rate >= VCO_HIGH_HIGH && rate < VCO_MAX) {
+		ki = 3;
+		kp_index = KP_BAND_HIGH_HIGH;
+	} else {
+		pr_err("%s: pll: %s has invalid rate: %lu\n", __func__,
+				pll->name, rate);
+		return -EINVAL;
+	}
+
+	kp = get_kp(ref_freq, kp_index);
+	if (kp < 0) {
+		pr_err("%s: pll: %s has invalid kp\n", __func__, pll->name);
+		return kp;
+	}
+
+	ret = __pll_enable(pll);
+	if (ret) {
+		pr_err("%s: pll: %s fails to enable\n", __func__, pll->name);
+		return ret;
+	}
+
+	/* put PLL in reset */
+	__pll_put_in_reset(pll);
+
+	writel(0, pll->pll_base + ctrl->vco_ctrl.u_offset);
+	val = readl(pll->pll_base + ctrl->vco_ctrl.l_offset);
+
+	if (rate >= VCO_LOW && rate < VCO_MID)
+		val |= (1 << PLL_VCO_LOW_SHIFT);
+
+	if (rate < VCO_HIGH)
+		val &= ~(1 << PLL_VCO_HIGH_SHIFT);
+	else
+		val |= (1 << PLL_VCO_HIGH_SHIFT);
+
+	writel(val, pll->pll_base + ctrl->vco_ctrl.l_offset);
+
+	/* program integer part of NDIV */
+	val = readl(pll->pll_base + ctrl->ndiv_int.offset);
+	val &= ~(bit_mask(ctrl->ndiv_int.width) << ctrl->ndiv_int.shift);
+	val |= vco->ndiv_int << ctrl->ndiv_int.shift;
+	writel(val, pll->pll_base + ctrl->ndiv_int.offset);
+
+	/* program fractional part of NDIV */
+	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
+		val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
+		val &= ~(bit_mask(ctrl->ndiv_frac.width) <<
+				ctrl->ndiv_frac.shift);
+		val |= vco->ndiv_frac << ctrl->ndiv_frac.shift;
+		writel(val, pll->pll_base + ctrl->ndiv_frac.offset);
+	}
+
+	/* program PDIV */
+	val = readl(pll->pll_base + ctrl->pdiv.offset);
+	val &= ~(bit_mask(ctrl->pdiv.width) << ctrl->pdiv.shift);
+	val |= vco->pdiv << ctrl->pdiv.shift;
+	writel(val, pll->pll_base + ctrl->pdiv.offset);
+
+	__pll_bring_out_reset(pll, kp, ka, ki);
+
+	ret = pll_wait_for_lock(pll);
+	if (ret < 0) {
+		pr_err("%s: pll: %s failed to lock\n", __func__, pll->name);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int iproc_pll_enable(struct clk_hw *hw)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+
+	return __pll_enable(pll);
+}
+
+static void iproc_pll_disable(struct clk_hw *hw)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+
+	if (ctrl->flags & IPROC_CLK_AON)
+		return;
+
+	__pll_disable(pll);
+}
+
+static unsigned long iproc_pll_recalc_rate(struct clk_hw *hw,
+	unsigned long parent_rate)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+	u64 ndiv;
+	unsigned int ndiv_int, ndiv_frac, pdiv;
+
+	if (parent_rate == 0)
+		return 0;
+
+	/* PLL needs to be locked */
+	val = readl(pll->pll_base + ctrl->status.offset);
+	if ((val & (1 << ctrl->status.shift)) == 0) {
+		pll->rate = 0;
+		return 0;
+	}
+
+	/*
+	 * PLL output frequency =
+	 *
+	 * ((ndiv_int + ndiv_frac / 2^20) * (parent clock rate / pdiv)
+	 */
+	val = readl(pll->pll_base + ctrl->ndiv_int.offset);
+	ndiv_int = (val >> ctrl->ndiv_int.shift) &
+		bit_mask(ctrl->ndiv_int.width);
+	ndiv = ndiv_int << ctrl->ndiv_int.shift;
+
+	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
+		val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
+		ndiv_frac = (val >> ctrl->ndiv_frac.shift) &
+			bit_mask(ctrl->ndiv_frac.width);
+
+		if (ndiv_frac != 0)
+			ndiv = (ndiv_int << ctrl->ndiv_int.shift) | ndiv_frac;
+	}
+
+	val = readl(pll->pll_base + ctrl->pdiv.offset);
+	pdiv = (val >> ctrl->pdiv.shift) & bit_mask(ctrl->pdiv.width);
+
+	pll->rate = (ndiv * parent_rate) >> ctrl->ndiv_int.shift;
+
+	if (pdiv == 0)
+		pll->rate *= 2;
+	else
+		pll->rate /= pdiv;
+
+	return pll->rate;
+}
+
+static const struct clk_ops iproc_pll_ops = {
+	.enable = iproc_pll_enable,
+	.disable = iproc_pll_disable,
+	.recalc_rate = iproc_pll_recalc_rate,
+};
+
+void __init iproc_pll_setup(struct device_node *node,
+		const struct iproc_pll_ctrl *ctrl,
+		const struct iproc_pll_vco_freq_param *vco_param,
+		unsigned int num_vco_entries)
+{
+	int ret;
+	struct clk *clk;
+	struct iproc_pll *pll;
+	struct clk_init_data init;
+	const char *parent_name;
+	unsigned int rate;
+
+	if (WARN_ON(!ctrl))
+		return;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->pll_base = of_iomap(node, 0);
+	if (WARN_ON(!pll->pll_base))
+		goto err_pll_iomap;
+
+	pll->pwr_base = of_iomap(node, 1);
+	if (WARN_ON(!pll->pwr_base))
+		goto err_pwr_iomap;
+
+	/* some PLLs require gating control at the top ASIU level */
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		pll->asiu_base = of_iomap(node, 2);
+		if (WARN_ON(!pll->asiu_base))
+			goto err_asiu_iomap;
+	}
+
+	pll->ctrl = ctrl;
+	pll->name = node->name;
+	init.name = node->name;
+	init.ops = &iproc_pll_ops;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	pll->hw.init = &init;
+
+	/* configure the PLL to the desired VCO frequency if specified */
+	ret = of_property_read_u32(node, "clock-frequency", &rate);
+	if (!ret) {
+		unsigned long parent_rate;
+		int rate_index;
+
+		if (WARN_ON(!vco_param))
+			goto err_clk_register;
+
+		pll->num_vco_entries = num_vco_entries;
+		pll->vco_param = vco_param;
+
+		parent_rate = __get_rate(parent_name);
+		if (WARN_ON(!parent_rate))
+			goto err_clk_register;
+
+		rate_index = pll_get_rate_index(pll, rate);
+		if (WARN_ON(rate_index < 0))
+			goto err_clk_register;
+
+		ret = pll_set_rate(pll, rate_index, parent_rate);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+	}
+
+	clk = clk_register(NULL, &pll->hw);
+	if (WARN_ON(IS_ERR(clk)))
+		goto err_clk_register;
+
+	pll->clk_data.clk_num = 1;
+	pll->clk_data.clks = &clk;
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get,
+			&pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_add;
+
+	return;
+
+err_clk_add:
+	clk_unregister(clk);
+err_clk_register:
+	if (pll->asiu_base)
+		iounmap(pll->asiu_base);
+err_asiu_iomap:
+	iounmap(pll->pwr_base);
+err_pwr_iomap:
+	iounmap(pll->pll_base);
+err_pll_iomap:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc.h b/drivers/clk/bcm/clk-iproc.h
new file mode 100644
index 0000000..4aa0479
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc.h
@@ -0,0 +1,155 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _CLK_IPROC_H
+#define _CLK_IPROC_H
+
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/of.h>
+#include <linux/clk-provider.h>
+
+#define IPROC_CLK_NAME_LEN 25
+#define IPROC_CLK_INVALID_OFFSET 0xffffffff
+#define bit_mask(width) ((1 << (width)) - 1)
+
+/* clock should not be disabled at runtime */
+#define IPROC_CLK_AON BIT(0)
+
+/* PLL requires gating through ASIU */
+#define IPROC_CLK_PLL_ASIU BIT(1)
+
+/* PLL has fractional part of the NDIV */
+#define IPROC_CLK_PLL_HAS_NDIV_FRAC BIT(2)
+
+/*
+ * Parameters for VCO frequency configuration
+ *
+ * VCO frequency =
+ * ((ndiv_int + ndiv_frac / 2^20) * (ref freqeuncy  / pdiv)
+ */
+struct iproc_pll_vco_freq_param {
+	unsigned long rate;
+	unsigned int ndiv_int;
+	unsigned int ndiv_frac;
+	unsigned int pdiv;
+};
+
+struct iproc_clk_reg_op {
+	unsigned int offset;
+	unsigned int shift;
+	unsigned int width;
+};
+
+/*
+ * Clock gating control at the top ASIU level
+ */
+struct iproc_asiu_gate {
+	unsigned int offset;
+	unsigned int en_shift;
+};
+
+/*
+ * Control of powering on/off of a PLL
+ *
+ * Before powering off a PLL, input isolation (ISO) needs to be enabled
+ */
+struct iproc_pll_aon_pwr_ctrl {
+	unsigned int offset;
+	unsigned int pwr_width;
+	unsigned int pwr_shift;
+	unsigned int iso_shift;
+};
+
+/*
+ * Control of the PLL reset, with Ki, Kp, and Ka parameters
+ */
+struct iproc_pll_reset_ctrl {
+	unsigned int offset;
+	unsigned int reset_shift;
+	unsigned int p_reset_shift;
+	unsigned int ki_shift;
+	unsigned int ki_width;
+	unsigned int kp_shift;
+	unsigned int kp_width;
+	unsigned int ka_shift;
+	unsigned int ka_width;
+};
+
+struct iproc_pll_vco_ctrl {
+	unsigned int u_offset;
+	unsigned int l_offset;
+};
+
+/*
+ * Main PLL control parameters
+ */
+struct iproc_pll_ctrl {
+	unsigned long flags;
+	struct iproc_pll_aon_pwr_ctrl aon;
+	struct iproc_asiu_gate asiu;
+	struct iproc_pll_reset_ctrl reset;
+	struct iproc_clk_reg_op ndiv_int;
+	struct iproc_clk_reg_op ndiv_frac;
+	struct iproc_clk_reg_op pdiv;
+	struct iproc_pll_vco_ctrl vco_ctrl;
+	struct iproc_clk_reg_op status;
+};
+
+/*
+ * Controls enabling/disabling a PLL derived clock
+ */
+struct iproc_clk_enable_ctrl {
+	unsigned int offset;
+	unsigned int enable_shift;
+	unsigned int hold_shift;
+	unsigned int bypass_shift;
+};
+
+/*
+ * Main clock control parameters for clocks derived from the PLLs
+ */
+struct iproc_clk_ctrl {
+	unsigned int channel;
+	unsigned long flags;
+	struct iproc_clk_enable_ctrl enable;
+	struct iproc_clk_reg_op mdiv;
+};
+
+/*
+ * Divisor of the ASIU clocks
+ */
+struct iproc_asiu_div {
+	unsigned int offset;
+	unsigned int en_shift;
+	unsigned int high_shift;
+	unsigned int high_width;
+	unsigned int low_shift;
+	unsigned int low_width;
+};
+
+extern void __init iproc_armpll_setup(struct device_node *node);
+extern void __init iproc_pll_setup(struct device_node *node,
+		const struct iproc_pll_ctrl *ctrl,
+		const struct iproc_pll_vco_freq_param *vco_param,
+		unsigned int num_freqs);
+extern void __init iproc_clk_setup(struct device_node *node,
+		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks);
+extern void __init iproc_asiu_setup(struct device_node *node,
+		const struct iproc_asiu_div *div,
+		const struct iproc_asiu_gate *gate, unsigned int num_clks);
+
+#endif /* _CLK_IPROC_H */
-- 
1.7.9.5

[PATCH 2/4] clk: iproc: add initial common clock support

[Ray Jui]

This adds basic and generic support for various iProc PLLs and clocks
including the ARMPLL, GENPLL, LCPLL, MIPIPLL, and ASIU clocks.

SoCs under the iProc architecture can define their specific register
offsets and clock parameters for their PLL and clock controllers. These
parameters can be passed as arugments into the generic iProc PLL and
clock setup functions

Derived from code originally provided by Jonathan Richardson
<jonathar@broadcom.com>

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/clk/Makefile               |    2 +-
 drivers/clk/bcm/Kconfig            |    9 +
 drivers/clk/bcm/Makefile           |    1 +
 drivers/clk/bcm/clk-iproc-armpll.c |  286 +++++++++++++++++++++
 drivers/clk/bcm/clk-iproc-asiu.c   |  275 ++++++++++++++++++++
 drivers/clk/bcm/clk-iproc-clk.c    |  238 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-pll.c    |  483 ++++++++++++++++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc.h        |  155 ++++++++++++
 8 files changed, 1448 insertions(+), 1 deletion(-)
 create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
 create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
 create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
 create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
 create mode 100644 drivers/clk/bcm/clk-iproc.h

diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index d5fba5b..eff0213 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -41,7 +41,7 @@ obj-$(CONFIG_ARCH_VT8500)		+= clk-vt8500.o
 obj-$(CONFIG_COMMON_CLK_WM831X)		+= clk-wm831x.o
 obj-$(CONFIG_COMMON_CLK_XGENE)		+= clk-xgene.o
 obj-$(CONFIG_COMMON_CLK_AT91)		+= at91/
-obj-$(CONFIG_ARCH_BCM_MOBILE)		+= bcm/
+obj-$(CONFIG_ARCH_BCM)			+= bcm/
 obj-$(CONFIG_ARCH_BERLIN)		+= berlin/
 obj-$(CONFIG_ARCH_HI3xxx)		+= hisilicon/
 obj-$(CONFIG_ARCH_HIP04)		+= hisilicon/
diff --git a/drivers/clk/bcm/Kconfig b/drivers/clk/bcm/Kconfig
index 75506e5..66b5b7f 100644
--- a/drivers/clk/bcm/Kconfig
+++ b/drivers/clk/bcm/Kconfig
@@ -7,3 +7,12 @@ config CLK_BCM_KONA
 	  Enable common clock framework support for Broadcom SoCs
 	  using "Kona" style clock control units, including those
 	  in the BCM281xx and BCM21664 families.
+
+config COMMON_CLK_IPROC
+	bool "Broadcom iProc clock support"
+	depends on ARCH_BCM_IPROC
+	depends on COMMON_CLK
+	default y
+	help
+	  Enable common clock framework support for Broadcom SoCs
+	  based on the "iProc" architecture
diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
index 6297d05..6926636 100644
--- a/drivers/clk/bcm/Makefile
+++ b/drivers/clk/bcm/Makefile
@@ -2,3 +2,4 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
+obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
diff --git a/drivers/clk/bcm/clk-iproc-armpll.c b/drivers/clk/bcm/clk-iproc-armpll.c
new file mode 100644
index 0000000..ec9b130
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-armpll.c
@@ -0,0 +1,286 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+
+#define IPROC_CLK_MAX_FREQ_POLICY                    0x3
+#define IPROC_CLK_POLICY_FREQ_OFFSET                 0x008
+#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT      8
+#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK       0x7
+
+#define IPROC_CLK_PLLARMA_OFFSET                     0xc00
+#define IPROC_CLK_PLLARMA_LOCK_SHIFT                 28
+#define IPROC_CLK_PLLARMA_PDIV_SHIFT                 24
+#define IPROC_CLK_PLLARMA_PDIV_MASK                  0xf
+#define IPROC_CLK_PLLARMA_NDIV_INT_SHIFT             8
+#define IPROC_CLK_PLLARMA_NDIV_INT_MASK              0x3ff
+
+#define IPROC_CLK_PLLARMB_OFFSET                     0xc04
+#define IPROC_CLK_PLLARMB_NDIV_FRAC_MASK             0xfffff
+
+#define IPROC_CLK_PLLARMC_OFFSET                     0xc08
+#define IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT            8
+#define IPROC_CLK_PLLARMC_MDIV_MASK                  0xff
+
+#define IPROC_CLK_PLLARMCTL5_OFFSET                  0xc20
+#define IPROC_CLK_PLLARMCTL5_H_MDIV_MASK             0xff
+
+#define IPROC_CLK_PLLARM_OFFSET_OFFSET               0xc24
+#define IPROC_CLK_PLLARM_SW_CTL_SHIFT                29
+#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT       20
+#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK        0xff
+#define IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK       0xfffff
+
+#define IPROC_CLK_ARM_DIV_OFFSET                     0xe00
+#define IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT  4
+#define IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK        0xf
+
+#define IPROC_CLK_POLICY_DBG_OFFSET                  0xec0
+#define IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT          12
+#define IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK           0x7
+
+enum iproc_arm_pll_fid {
+	ARM_PLL_FID_CRYSTAL_CLK   = 0,
+	ARM_PLL_FID_SYS_CLK       = 2,
+	ARM_PLL_FID_CH0_SLOW_CLK  = 6,
+	ARM_PLL_FID_CH1_FAST_CLK  = 7
+};
+
+struct iproc_arm_pll {
+	struct clk_hw hw;
+	void __iomem *base;
+	struct clk_onecell_data clk_data;
+	unsigned long rate;
+};
+
+#define to_iproc_arm_pll(hw) container_of(hw, struct iproc_arm_pll, hw)
+
+static unsigned int __get_fid(struct iproc_arm_pll *pll)
+{
+	u32 val;
+	unsigned int policy, fid, active_fid;
+
+	val = readl(pll->base + IPROC_CLK_ARM_DIV_OFFSET);
+	if (val & (1 << IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT))
+		policy = val & IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK;
+	else
+		policy = 0;
+
+	/* something is seriously wrong */
+	BUG_ON(policy > IPROC_CLK_MAX_FREQ_POLICY);
+
+	val = readl(pll->base + IPROC_CLK_POLICY_FREQ_OFFSET);
+	fid = (val >> (IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT * policy)) &
+		IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK;
+
+	val = readl(pll->base + IPROC_CLK_POLICY_DBG_OFFSET);
+	active_fid = IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK &
+		(val >> IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT);
+	if (fid != active_fid) {
+		pr_debug("%s: fid override %u->%u\n", __func__,	fid,
+				active_fid);
+		fid = active_fid;
+	}
+
+	pr_debug("%s: active fid: %u\n", __func__, fid);
+
+	return fid;
+}
+
+/*
+ * Determine the mdiv (post divider) based on the frequency ID being used.
+ * There are 4 sources that can be used to derive the output clock rate:
+ *    - 25 MHz Crystal
+ *    - System clock
+ *    - PLL channel 0 (slow clock)
+ *    - PLL channel 1 (fast clock)
+ */
+static int __get_mdiv(struct iproc_arm_pll *pll)
+{
+	unsigned int fid;
+	int mdiv;
+	u32 val;
+
+	fid = __get_fid(pll);
+
+	switch (fid) {
+	case ARM_PLL_FID_CRYSTAL_CLK:
+	case ARM_PLL_FID_SYS_CLK:
+		mdiv = 1;
+		break;
+
+	case ARM_PLL_FID_CH0_SLOW_CLK:
+		val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
+		mdiv = val & IPROC_CLK_PLLARMC_MDIV_MASK;
+		if (mdiv == 0)
+			mdiv = 256;
+		break;
+
+	case ARM_PLL_FID_CH1_FAST_CLK:
+		val = readl(pll->base +	IPROC_CLK_PLLARMCTL5_OFFSET);
+		mdiv = val & IPROC_CLK_PLLARMCTL5_H_MDIV_MASK;
+		if (mdiv == 0)
+			mdiv = 256;
+		break;
+
+	default:
+		mdiv = -EFAULT;
+	}
+
+	return mdiv;
+}
+
+static unsigned int __get_ndiv(struct iproc_arm_pll *pll)
+{
+	u32 val;
+	unsigned int ndiv_int, ndiv_frac, ndiv;
+
+	val = readl(pll->base + IPROC_CLK_PLLARM_OFFSET_OFFSET);
+	if (val & (1 << IPROC_CLK_PLLARM_SW_CTL_SHIFT)) {
+		/*
+		 * offset mode is active. Read the ndiv from the PLLARM OFFSET
+		 * register
+		 */
+		ndiv_int = (val >> IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT) &
+			IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK;
+		if (ndiv_int == 0)
+			ndiv_int = 256;
+
+		ndiv_frac = val & IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK;
+	} else {
+		/* offset mode not active */
+		val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
+		ndiv_int = (val >> IPROC_CLK_PLLARMA_NDIV_INT_SHIFT) &
+			IPROC_CLK_PLLARMA_NDIV_INT_MASK;
+		if (ndiv_int == 0)
+			ndiv_int = 1024;
+
+		val = readl(pll->base + IPROC_CLK_PLLARMB_OFFSET);
+		ndiv_frac = val & IPROC_CLK_PLLARMB_NDIV_FRAC_MASK;
+	}
+
+	ndiv = (ndiv_int << 20) | ndiv_frac;
+
+	return ndiv;
+}
+
+/*
+ * The output frequency of the ARM PLL is calculated based on the ARM PLL
+ * divider values:
+ *   pdiv = ARM PLL pre-divider
+ *   ndiv = ARM PLL multiplier
+ *   mdiv = ARM PLL post divider
+ *
+ * The frequency is calculated by:
+ *   ((ndiv * parent clock rate) / pdiv) / mdiv
+ */
+static unsigned long iproc_arm_pll_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_arm_pll *pll = to_iproc_arm_pll(hw);
+	u32 val;
+	int mdiv;
+	u64 ndiv;
+	unsigned int pdiv;
+
+	/* in bypass mode, use parent rate */
+	val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
+	if (val & (1 << IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT)) {
+		pll->rate = parent_rate;
+		return pll->rate;
+	}
+
+	/* PLL needs to be locked */
+	val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
+	if (!(val & (1 << IPROC_CLK_PLLARMA_LOCK_SHIFT))) {
+		pll->rate = 0;
+		return 0;
+	}
+
+	pdiv = (val >> IPROC_CLK_PLLARMA_PDIV_SHIFT) &
+		IPROC_CLK_PLLARMA_PDIV_MASK;
+	if (pdiv == 0)
+		pdiv = 16;
+
+	ndiv = __get_ndiv(pll);
+	mdiv = __get_mdiv(pll);
+	if (mdiv <= 0) {
+		pll->rate = 0;
+		return 0;
+	}
+	pll->rate = (ndiv * parent_rate) >> 20;
+	pll->rate = (pll->rate / pdiv) / mdiv;
+
+	pr_debug("%s: ARM PLL rate: %lu. parent rate: %lu\n", __func__,
+			pll->rate, parent_rate);
+	pr_debug("%s: ndiv_int: %u, pdiv: %u, mdiv: %d\n", __func__,
+			(unsigned int)(ndiv >> 20), pdiv, mdiv);
+
+	return pll->rate;
+}
+
+static const struct clk_ops iproc_arm_pll_ops = {
+	.recalc_rate = iproc_arm_pll_recalc_rate,
+};
+
+void __init iproc_armpll_setup(struct device_node *node)
+{
+	int ret;
+	struct clk *clk;
+	struct iproc_arm_pll *pll;
+	struct clk_init_data init;
+	const char *parent_name;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->base = of_iomap(node, 0);
+	if (WARN_ON(!pll->base))
+		goto err_free_pll;
+
+	init.name = node->name;
+	init.ops = &iproc_arm_pll_ops;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	pll->hw.init = &init;
+
+	clk = clk_register(NULL, &pll->hw);
+	if (WARN_ON(IS_ERR(clk)))
+		goto err_iounmap;
+
+	pll->clk_data.clk_num = 1;
+	pll->clk_data.clks = &clk;
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_unregister;
+
+	return;
+
+err_clk_unregister:
+	clk_unregister(clk);
+err_iounmap:
+	iounmap(pll->base);
+err_free_pll:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc-asiu.c b/drivers/clk/bcm/clk-iproc-asiu.c
new file mode 100644
index 0000000..ab86b8c
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-asiu.c
@@ -0,0 +1,275 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+struct iproc_asiu;
+
+struct iproc_asiu_clk {
+	struct clk_hw hw;
+	const char *name;
+	struct iproc_asiu *asiu;
+	unsigned long rate;
+	struct iproc_asiu_div div;
+	struct iproc_asiu_gate gate;
+};
+
+struct iproc_asiu {
+	void __iomem *div_base;
+	void __iomem *gate_base;
+
+	struct clk_onecell_data clk_data;
+	struct iproc_asiu_clk *clks;
+};
+
+#define to_asiu_clk(hw) container_of(hw, struct iproc_asiu_clk, hw)
+
+static int iproc_asiu_clk_enable(struct clk_hw *hw)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+
+	/* some clocks at the ASIU level are always enabled */
+	if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
+		return 0;
+
+	val = readl(asiu->gate_base + clk->gate.offset);
+	val |= (1 << clk->gate.en_shift);
+	writel(val, asiu->gate_base + clk->gate.offset);
+
+	return 0;
+}
+
+static void iproc_asiu_clk_disable(struct clk_hw *hw)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+
+	/* some clocks at the ASIU level are always enabled */
+	if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
+		return;
+
+	val = readl(asiu->gate_base + clk->gate.offset);
+	val &= ~(1 << clk->gate.en_shift);
+	writel(val, asiu->gate_base + clk->gate.offset);
+}
+
+static unsigned long iproc_asiu_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+	unsigned int div_h, div_l;
+
+	if (parent_rate == 0) {
+		clk->rate = 0;
+		return 0;
+	}
+
+	/* if clock divisor is not enabled, simply return parent rate */
+	val = readl(asiu->div_base + clk->div.offset);
+	if ((val & (1 << clk->div.en_shift)) == 0) {
+		clk->rate = parent_rate;
+		return parent_rate;
+	}
+
+	/* clock rate = parent rate / (high_div + 1) + (low_div + 1) */
+	div_h = (val >> clk->div.high_shift) & bit_mask(clk->div.high_width);
+	div_h++;
+	div_l = (val >> clk->div.low_shift) & bit_mask(clk->div.low_width);
+	div_l++;
+
+	clk->rate = parent_rate / (div_h + div_l);
+	pr_debug("%s: rate: %lu. parent rate: %lu div_h: %u div_l: %u\n",
+		__func__, clk->rate, parent_rate, div_h, div_l);
+
+	return clk->rate;
+}
+
+static long iproc_asiu_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	unsigned int div;
+
+	if (rate == 0 || *parent_rate == 0)
+		return -EINVAL;
+
+	if (rate == *parent_rate)
+		return *parent_rate;
+
+	div = DIV_ROUND_UP(*parent_rate, rate);
+	if (div < 2)
+		return *parent_rate;
+
+	return *parent_rate / div;
+}
+
+static int iproc_asiu_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	unsigned int div, div_h, div_l;
+	u32 val;
+
+	if (rate == 0 || parent_rate == 0)
+		return -EINVAL;
+
+	/* simply disable the divisor if one wants the same rate as parent */
+	if (rate == parent_rate) {
+		val = readl(asiu->div_base + clk->div.offset);
+		val &= ~(1 << clk->div.en_shift);
+		writel(val, asiu->div_base + clk->div.offset);
+		return 0;
+	}
+
+	div = DIV_ROUND_UP(parent_rate, rate);
+	if (div < 2)
+		return -EINVAL;
+
+	div_h = div_l = div >> 1;
+	div_h--;
+	div_l--;
+
+	val = readl(asiu->div_base + clk->div.offset);
+	val |= 1 << clk->div.en_shift;
+	if (div_h) {
+		val &= ~(bit_mask(clk->div.high_width)
+				<< clk->div.high_shift);
+		val |= div_h << clk->div.high_shift;
+	} else {
+		val &= ~(bit_mask(clk->div.high_width)
+				<< clk->div.high_shift);
+	}
+	if (div_l) {
+		val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
+		val |= div_l << clk->div.low_shift;
+	} else {
+		val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
+	}
+	writel(val, asiu->div_base + clk->div.offset);
+
+	return 0;
+}
+
+static const struct clk_ops iproc_asiu_ops = {
+	.enable = iproc_asiu_clk_enable,
+	.disable = iproc_asiu_clk_disable,
+	.recalc_rate = iproc_asiu_clk_recalc_rate,
+	.round_rate = iproc_asiu_clk_round_rate,
+	.set_rate = iproc_asiu_clk_set_rate,
+};
+
+void __init iproc_asiu_setup(struct device_node *node,
+		const struct iproc_asiu_div *div,
+		const struct iproc_asiu_gate *gate, unsigned int num_clks)
+{
+	int i, ret;
+	struct iproc_asiu *asiu;
+
+	if (WARN_ON(!gate || !div))
+		return;
+
+	asiu = kzalloc(sizeof(*asiu), GFP_KERNEL);
+	if (WARN_ON(!asiu))
+		return;
+
+	asiu->clk_data.clk_num = num_clks;
+	asiu->clk_data.clks = kcalloc(num_clks, sizeof(*asiu->clk_data.clks),
+			GFP_KERNEL);
+	if (WARN_ON(!asiu->clk_data.clks))
+		goto err_clks;
+
+	asiu->clks = kcalloc(num_clks, sizeof(*asiu->clks), GFP_KERNEL);
+	if (WARN_ON(!asiu->clks))
+		goto err_asiu_clks;
+
+	asiu->div_base = of_iomap(node, 0);
+	if (WARN_ON(!asiu->div_base))
+		goto err_iomap_div;
+
+	asiu->gate_base = of_iomap(node, 1);
+	if (WARN_ON(!asiu->gate_base))
+		goto err_iomap_gate;
+
+	for (i = 0; i < num_clks; i++) {
+		struct clk_init_data init;
+		struct clk *clk;
+		const char *parent_name;
+		struct iproc_asiu_clk *asiu_clk;
+		const char *clk_name;
+
+		clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
+		if (WARN_ON(!clk_name))
+			goto err_clk_register;
+
+		ret = of_property_read_string_index(node, "clock-output-names",
+				i, &clk_name);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+
+		asiu_clk = &asiu->clks[i];
+		asiu_clk->name = clk_name;
+		asiu_clk->asiu = asiu;
+		asiu_clk->div = div[i];
+		asiu_clk->gate = gate[i];
+		init.name = clk_name;
+		init.ops = &iproc_asiu_ops;
+		init.flags = 0;
+		parent_name = of_clk_get_parent_name(node, 0);
+		init.parent_names = (parent_name ? &parent_name : NULL);
+		init.num_parents = (parent_name ? 1 : 0);
+		asiu_clk->hw.init = &init;
+
+		clk = clk_register(NULL, &asiu_clk->hw);
+		if (WARN_ON(IS_ERR(clk)))
+			goto err_clk_register;
+		asiu->clk_data.clks[i] = clk;
+	}
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get,
+			&asiu->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_register;
+
+	return;
+
+err_clk_register:
+	for (i = 0; i < num_clks; i++)
+		kfree(asiu->clks[i].name);
+	iounmap(asiu->gate_base);
+
+err_iomap_gate:
+	iounmap(asiu->div_base);
+
+err_iomap_div:
+	kfree(asiu->clks);
+
+err_asiu_clks:
+	kfree(asiu->clk_data.clks);
+
+err_clks:
+	kfree(asiu);
+}
diff --git a/drivers/clk/bcm/clk-iproc-clk.c b/drivers/clk/bcm/clk-iproc-clk.c
new file mode 100644
index 0000000..be3c42c
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-clk.c
@@ -0,0 +1,238 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+struct iproc_pll;
+
+struct iproc_clk {
+	struct clk_hw hw;
+	const char *name;
+	struct iproc_pll *pll;
+	unsigned long rate;
+	const struct iproc_clk_ctrl *ctrl;
+};
+
+struct iproc_pll {
+	void __iomem *base;
+	struct clk_onecell_data clk_data;
+	struct iproc_clk *clks;
+};
+
+#define to_iproc_clk(hw) container_of(hw, struct iproc_clk, hw)
+
+static int iproc_clk_enable(struct clk_hw *hw)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+
+	/* channel enable is active low */
+	val = readl(pll->base + ctrl->enable.offset);
+	val &= ~(1 << ctrl->enable.enable_shift);
+	writel(val, pll->base + ctrl->enable.offset);
+
+	/* also make sure channel is not held */
+	val = readl(pll->base + ctrl->enable.offset);
+	val &= ~(1 << ctrl->enable.hold_shift);
+	writel(val, pll->base + ctrl->enable.offset);
+
+	return 0;
+}
+
+static void iproc_clk_disable(struct clk_hw *hw)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+
+	if (ctrl->flags & IPROC_CLK_AON)
+		return;
+
+	val = readl(pll->base + ctrl->enable.offset);
+	val |= 1 << ctrl->enable.enable_shift;
+	writel(val, pll->base + ctrl->enable.offset);
+}
+
+static unsigned long iproc_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+	unsigned int mdiv;
+
+	if (parent_rate == 0)
+		return 0;
+
+	val = readl(pll->base + ctrl->mdiv.offset);
+	mdiv = (val >> ctrl->mdiv.shift) & bit_mask(ctrl->mdiv.width);
+	if (mdiv == 0)
+		mdiv = 256;
+
+	clk->rate = parent_rate / mdiv;
+
+	return clk->rate;
+}
+
+static long iproc_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	unsigned int div;
+
+	if (rate == 0 || *parent_rate == 0)
+		return -EINVAL;
+
+	if (rate == *parent_rate)
+		return *parent_rate;
+
+	div = DIV_ROUND_UP(*parent_rate, rate);
+	if (div < 2)
+		return *parent_rate;
+
+	if (div > 256)
+		div = 256;
+
+	return *parent_rate / div;
+}
+
+static int iproc_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+	unsigned int div;
+
+	if (rate == 0 || parent_rate == 0)
+		return -EINVAL;
+
+	div = DIV_ROUND_UP(parent_rate, rate);
+	if (div > 256)
+		return -EINVAL;
+
+	val = readl(pll->base + ctrl->mdiv.offset);
+	if (div == 256) {
+		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
+	} else {
+		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
+		val |= div << ctrl->mdiv.shift;
+	}
+	writel(val, pll->base + ctrl->mdiv.offset);
+	clk->rate = parent_rate / div;
+
+	return 0;
+}
+
+static const struct clk_ops iproc_clk_ops = {
+	.enable = iproc_clk_enable,
+	.disable = iproc_clk_disable,
+	.recalc_rate = iproc_clk_recalc_rate,
+	.round_rate = iproc_clk_round_rate,
+	.set_rate = iproc_clk_set_rate,
+};
+
+void __init iproc_clk_setup(struct device_node *node,
+		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks)
+{
+	int i, ret;
+	struct iproc_pll *pll;
+
+	if (WARN_ON(!ctrl))
+		return;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->clk_data.clk_num = num_clks;
+	pll->clk_data.clks = kcalloc(num_clks, sizeof(*pll->clk_data.clks),
+			GFP_KERNEL);
+	if (WARN_ON(!pll->clk_data.clks))
+		goto err_clks;
+
+	pll->clks = kcalloc(num_clks, sizeof(*pll->clks), GFP_KERNEL);
+	if (WARN_ON(!pll->clks))
+		goto err_pll_clks;
+
+	pll->base = of_iomap(node, 0);
+	if (WARN_ON(!pll->base))
+		goto err_iomap;
+
+	for (i = 0; i < num_clks; i++) {
+		struct clk_init_data init;
+		struct clk *clk;
+		const char *parent_name;
+		struct iproc_clk *iclk;
+		const char *clk_name;
+
+		clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
+		if (WARN_ON(!clk_name))
+			goto err_clk_register;
+
+		ret = of_property_read_string_index(node, "clock-output-names",
+				i, &clk_name);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+
+		iclk = &pll->clks[i];
+		iclk->name = clk_name;
+		iclk->pll = pll;
+		iclk->ctrl = &ctrl[i];
+		init.name = clk_name;
+		init.ops = &iproc_clk_ops;
+		init.flags = 0;
+		parent_name = of_clk_get_parent_name(node, 0);
+		init.parent_names = (parent_name ? &parent_name : NULL);
+		init.num_parents = (parent_name ? 1 : 0);
+		iclk->hw.init = &init;
+
+		clk = clk_register(NULL, &iclk->hw);
+		if (WARN_ON(IS_ERR(clk)))
+			goto err_clk_register;
+		pll->clk_data.clks[i] = clk;
+	}
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_register;
+
+	return;
+
+err_clk_register:
+	for (i = 0; i < num_clks; i++)
+		kfree(pll->clks[i].name);
+	iounmap(pll->base);
+
+err_iomap:
+	kfree(pll->clks);
+
+err_pll_clks:
+	kfree(pll->clk_data.clks);
+
+err_clks:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc-pll.c b/drivers/clk/bcm/clk-iproc-pll.c
new file mode 100644
index 0000000..cd3bd38
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-pll.c
@@ -0,0 +1,483 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+#define PLL_VCO_HIGH_SHIFT 19
+#define PLL_VCO_LOW_SHIFT  30
+
+/* number of delay loops waiting for PLL to lock */
+#define LOCK_DELAY 100
+
+/* number of VCO frequency bands */
+#define NUM_FREQ_BANDS 8
+
+#define NUM_KP_BANDS 3
+enum kp_band {
+	KP_BAND_MID = 0,
+	KP_BAND_HIGH,
+	KP_BAND_HIGH_HIGH
+};
+
+static const unsigned int kp_table[NUM_KP_BANDS][NUM_FREQ_BANDS] = {
+	{ 5, 6, 6, 7, 7, 8, 9, 10 },
+	{ 4, 4, 5, 5, 6, 7, 8, 9  },
+	{ 4, 5, 5, 6, 7, 8, 9, 10 },
+};
+
+static const unsigned long ref_freq_table[NUM_FREQ_BANDS][2] = {
+	{ 10000000,  12500000  },
+	{ 12500000,  15000000  },
+	{ 15000000,  20000000  },
+	{ 20000000,  25000000  },
+	{ 25000000,  50000000  },
+	{ 50000000,  75000000  },
+	{ 75000000,  100000000 },
+	{ 100000000, 125000000 },
+};
+
+enum vco_freq_range {
+	VCO_LOW       = 700000000U,
+	VCO_MID       = 1200000000U,
+	VCO_HIGH      = 2200000000U,
+	VCO_HIGH_HIGH = 3100000000U,
+	VCO_MAX       = 4000000000U,
+};
+
+struct iproc_pll {
+	struct clk_hw hw;
+	void __iomem *pll_base;
+	void __iomem *pwr_base;
+	void __iomem *asiu_base;
+	struct clk_onecell_data clk_data;
+	const char *name;
+	const struct iproc_pll_ctrl *ctrl;
+	const struct iproc_pll_vco_freq_param *vco_param;
+	unsigned int num_vco_entries;
+	unsigned long rate;
+};
+
+#define to_iproc_pll(hw) container_of(hw, struct iproc_pll, hw)
+
+/*
+ * Get the clock rate based on name
+ */
+static unsigned long __get_rate(const char *clk_name)
+{
+	struct clk *clk;
+
+	clk = __clk_lookup(clk_name);
+	if (!clk) {
+		pr_err("%s: unable to find clock by name: %s\n", __func__,
+				clk_name);
+		return 0;
+	}
+
+	return clk_get_rate(clk);
+}
+
+/*
+ * Based on the target frequency, find a match from the VCO frequency parameter
+ * table and return its index
+ */
+static int pll_get_rate_index(struct iproc_pll *pll, unsigned int target_rate)
+{
+	int i;
+
+	for (i = 0; i < pll->num_vco_entries; i++)
+		if (target_rate == pll->vco_param[i].rate)
+			break;
+
+	if (i >= pll->num_vco_entries)
+		return -EINVAL;
+
+	return i;
+}
+
+static int get_kp(unsigned long ref_freq, enum kp_band kp_index)
+{
+	int i;
+
+	if (ref_freq < ref_freq_table[0][0])
+		return -EINVAL;
+
+	for (i = 0; i < NUM_FREQ_BANDS; i++) {
+		if (ref_freq >= ref_freq_table[i][0] &&
+			ref_freq < ref_freq_table[i][1])
+			return kp_table[kp_index][i];
+	}
+	return -EINVAL;
+}
+
+static int pll_wait_for_lock(struct iproc_pll *pll)
+{
+	int i;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+
+	for (i = 0; i < LOCK_DELAY; i++) {
+		u32 val = readl(pll->pll_base + ctrl->status.offset);
+
+		if (val & (1 << ctrl->status.shift))
+			return 0;
+		udelay(10);
+	}
+
+	return -EIO;
+}
+
+static void __pll_disable(struct iproc_pll *pll)
+{
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		val = readl(pll->asiu_base + ctrl->asiu.offset);
+		val &= ~(1 << ctrl->asiu.en_shift);
+		writel(val, pll->asiu_base + ctrl->asiu.offset);
+	}
+
+	/* latch input value so core power can be shut down */
+	val = readl(pll->pwr_base + ctrl->aon.offset);
+	val |= (1 << ctrl->aon.iso_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+
+	/* power down the core */
+	val &= ~(bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+}
+
+static int __pll_enable(struct iproc_pll *pll)
+{
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+
+	/* power up the PLL and make sure it's not latched */
+	val = readl(pll->pwr_base + ctrl->aon.offset);
+	val |= bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift;
+	val &= ~(1 << ctrl->aon.iso_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+
+	/* certain PLLs also need to be ungated from the ASIU top level */
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		val = readl(pll->asiu_base + ctrl->asiu.offset);
+		val |= (1 << ctrl->asiu.en_shift);
+		writel(val, pll->asiu_base + ctrl->asiu.offset);
+	}
+
+	return 0;
+}
+
+static void __pll_put_in_reset(struct iproc_pll *pll)
+{
+	u32 val;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
+
+	val = readl(pll->pll_base + reset->offset);
+	val &= ~(1 << reset->reset_shift | 1 << reset->p_reset_shift);
+	writel(val, pll->pll_base + reset->offset);
+}
+
+static void __pll_bring_out_reset(struct iproc_pll *pll, unsigned int kp,
+		unsigned int ka, unsigned int ki)
+{
+	u32 val;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
+
+	val = readl(pll->pll_base + reset->offset);
+	val &= ~(bit_mask(reset->ki_width) << reset->ki_shift |
+		bit_mask(reset->kp_width) << reset->kp_shift |
+		bit_mask(reset->ka_width) << reset->ka_shift);
+	val |=  ki << reset->ki_shift | kp << reset->kp_shift |
+		ka << reset->ka_shift;
+	val |= 1 << reset->reset_shift | 1 << reset->p_reset_shift;
+	writel(val, pll->pll_base + reset->offset);
+}
+
+static int pll_set_rate(struct iproc_pll *pll, unsigned int rate_index,
+		unsigned long parent_rate)
+{
+	const struct iproc_pll_vco_freq_param *vco =
+				&pll->vco_param[rate_index];
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	int ka = 0, ki, kp, ret;
+	unsigned long rate = vco->rate;
+	u32 val;
+	enum kp_band kp_index;
+	unsigned long ref_freq;
+
+	/*
+	 * reference frequency = parent frequency / PDIV
+	 * If PDIV = 0, then it becomes a multiplier (x2)
+	 */
+	if (vco->pdiv == 0)
+		ref_freq = parent_rate * 2;
+	else
+		ref_freq = parent_rate / vco->pdiv;
+
+	/* determine Ki and Kp index based on target VCO frequency */
+	if (rate >= VCO_LOW && rate < VCO_HIGH) {
+		ki = 4;
+		kp_index = KP_BAND_MID;
+	} else if (rate >= VCO_HIGH && rate && rate < VCO_HIGH_HIGH) {
+		ki = 3;
+		kp_index = KP_BAND_HIGH;
+	} else if (rate >= VCO_HIGH_HIGH && rate < VCO_MAX) {
+		ki = 3;
+		kp_index = KP_BAND_HIGH_HIGH;
+	} else {
+		pr_err("%s: pll: %s has invalid rate: %lu\n", __func__,
+				pll->name, rate);
+		return -EINVAL;
+	}
+
+	kp = get_kp(ref_freq, kp_index);
+	if (kp < 0) {
+		pr_err("%s: pll: %s has invalid kp\n", __func__, pll->name);
+		return kp;
+	}
+
+	ret = __pll_enable(pll);
+	if (ret) {
+		pr_err("%s: pll: %s fails to enable\n", __func__, pll->name);
+		return ret;
+	}
+
+	/* put PLL in reset */
+	__pll_put_in_reset(pll);
+
+	writel(0, pll->pll_base + ctrl->vco_ctrl.u_offset);
+	val = readl(pll->pll_base + ctrl->vco_ctrl.l_offset);
+
+	if (rate >= VCO_LOW && rate < VCO_MID)
+		val |= (1 << PLL_VCO_LOW_SHIFT);
+
+	if (rate < VCO_HIGH)
+		val &= ~(1 << PLL_VCO_HIGH_SHIFT);
+	else
+		val |= (1 << PLL_VCO_HIGH_SHIFT);
+
+	writel(val, pll->pll_base + ctrl->vco_ctrl.l_offset);
+
+	/* program integer part of NDIV */
+	val = readl(pll->pll_base + ctrl->ndiv_int.offset);
+	val &= ~(bit_mask(ctrl->ndiv_int.width) << ctrl->ndiv_int.shift);
+	val |= vco->ndiv_int << ctrl->ndiv_int.shift;
+	writel(val, pll->pll_base + ctrl->ndiv_int.offset);
+
+	/* program fractional part of NDIV */
+	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
+		val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
+		val &= ~(bit_mask(ctrl->ndiv_frac.width) <<
+				ctrl->ndiv_frac.shift);
+		val |= vco->ndiv_frac << ctrl->ndiv_frac.shift;
+		writel(val, pll->pll_base + ctrl->ndiv_frac.offset);
+	}
+
+	/* program PDIV */
+	val = readl(pll->pll_base + ctrl->pdiv.offset);
+	val &= ~(bit_mask(ctrl->pdiv.width) << ctrl->pdiv.shift);
+	val |= vco->pdiv << ctrl->pdiv.shift;
+	writel(val, pll->pll_base + ctrl->pdiv.offset);
+
+	__pll_bring_out_reset(pll, kp, ka, ki);
+
+	ret = pll_wait_for_lock(pll);
+	if (ret < 0) {
+		pr_err("%s: pll: %s failed to lock\n", __func__, pll->name);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int iproc_pll_enable(struct clk_hw *hw)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+
+	return __pll_enable(pll);
+}
+
+static void iproc_pll_disable(struct clk_hw *hw)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+
+	if (ctrl->flags & IPROC_CLK_AON)
+		return;
+
+	__pll_disable(pll);
+}
+
+static unsigned long iproc_pll_recalc_rate(struct clk_hw *hw,
+	unsigned long parent_rate)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+	u64 ndiv;
+	unsigned int ndiv_int, ndiv_frac, pdiv;
+
+	if (parent_rate == 0)
+		return 0;
+
+	/* PLL needs to be locked */
+	val = readl(pll->pll_base + ctrl->status.offset);
+	if ((val & (1 << ctrl->status.shift)) == 0) {
+		pll->rate = 0;
+		return 0;
+	}
+
+	/*
+	 * PLL output frequency =
+	 *
+	 * ((ndiv_int + ndiv_frac / 2^20) * (parent clock rate / pdiv)
+	 */
+	val = readl(pll->pll_base + ctrl->ndiv_int.offset);
+	ndiv_int = (val >> ctrl->ndiv_int.shift) &
+		bit_mask(ctrl->ndiv_int.width);
+	ndiv = ndiv_int << ctrl->ndiv_int.shift;
+
+	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
+		val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
+		ndiv_frac = (val >> ctrl->ndiv_frac.shift) &
+			bit_mask(ctrl->ndiv_frac.width);
+
+		if (ndiv_frac != 0)
+			ndiv = (ndiv_int << ctrl->ndiv_int.shift) | ndiv_frac;
+	}
+
+	val = readl(pll->pll_base + ctrl->pdiv.offset);
+	pdiv = (val >> ctrl->pdiv.shift) & bit_mask(ctrl->pdiv.width);
+
+	pll->rate = (ndiv * parent_rate) >> ctrl->ndiv_int.shift;
+
+	if (pdiv == 0)
+		pll->rate *= 2;
+	else
+		pll->rate /= pdiv;
+
+	return pll->rate;
+}
+
+static const struct clk_ops iproc_pll_ops = {
+	.enable = iproc_pll_enable,
+	.disable = iproc_pll_disable,
+	.recalc_rate = iproc_pll_recalc_rate,
+};
+
+void __init iproc_pll_setup(struct device_node *node,
+		const struct iproc_pll_ctrl *ctrl,
+		const struct iproc_pll_vco_freq_param *vco_param,
+		unsigned int num_vco_entries)
+{
+	int ret;
+	struct clk *clk;
+	struct iproc_pll *pll;
+	struct clk_init_data init;
+	const char *parent_name;
+	unsigned int rate;
+
+	if (WARN_ON(!ctrl))
+		return;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->pll_base = of_iomap(node, 0);
+	if (WARN_ON(!pll->pll_base))
+		goto err_pll_iomap;
+
+	pll->pwr_base = of_iomap(node, 1);
+	if (WARN_ON(!pll->pwr_base))
+		goto err_pwr_iomap;
+
+	/* some PLLs require gating control at the top ASIU level */
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		pll->asiu_base = of_iomap(node, 2);
+		if (WARN_ON(!pll->asiu_base))
+			goto err_asiu_iomap;
+	}
+
+	pll->ctrl = ctrl;
+	pll->name = node->name;
+	init.name = node->name;
+	init.ops = &iproc_pll_ops;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	pll->hw.init = &init;
+
+	/* configure the PLL to the desired VCO frequency if specified */
+	ret = of_property_read_u32(node, "clock-frequency", &rate);
+	if (!ret) {
+		unsigned long parent_rate;
+		int rate_index;
+
+		if (WARN_ON(!vco_param))
+			goto err_clk_register;
+
+		pll->num_vco_entries = num_vco_entries;
+		pll->vco_param = vco_param;
+
+		parent_rate = __get_rate(parent_name);
+		if (WARN_ON(!parent_rate))
+			goto err_clk_register;
+
+		rate_index = pll_get_rate_index(pll, rate);
+		if (WARN_ON(rate_index < 0))
+			goto err_clk_register;
+
+		ret = pll_set_rate(pll, rate_index, parent_rate);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+	}
+
+	clk = clk_register(NULL, &pll->hw);
+	if (WARN_ON(IS_ERR(clk)))
+		goto err_clk_register;
+
+	pll->clk_data.clk_num = 1;
+	pll->clk_data.clks = &clk;
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get,
+			&pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_add;
+
+	return;
+
+err_clk_add:
+	clk_unregister(clk);
+err_clk_register:
+	if (pll->asiu_base)
+		iounmap(pll->asiu_base);
+err_asiu_iomap:
+	iounmap(pll->pwr_base);
+err_pwr_iomap:
+	iounmap(pll->pll_base);
+err_pll_iomap:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc.h b/drivers/clk/bcm/clk-iproc.h
new file mode 100644
index 0000000..4aa0479
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc.h
@@ -0,0 +1,155 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _CLK_IPROC_H
+#define _CLK_IPROC_H
+
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/of.h>
+#include <linux/clk-provider.h>
+
+#define IPROC_CLK_NAME_LEN 25
+#define IPROC_CLK_INVALID_OFFSET 0xffffffff
+#define bit_mask(width) ((1 << (width)) - 1)
+
+/* clock should not be disabled at runtime */
+#define IPROC_CLK_AON BIT(0)
+
+/* PLL requires gating through ASIU */
+#define IPROC_CLK_PLL_ASIU BIT(1)
+
+/* PLL has fractional part of the NDIV */
+#define IPROC_CLK_PLL_HAS_NDIV_FRAC BIT(2)
+
+/*
+ * Parameters for VCO frequency configuration
+ *
+ * VCO frequency =
+ * ((ndiv_int + ndiv_frac / 2^20) * (ref freqeuncy  / pdiv)
+ */
+struct iproc_pll_vco_freq_param {
+	unsigned long rate;
+	unsigned int ndiv_int;
+	unsigned int ndiv_frac;
+	unsigned int pdiv;
+};
+
+struct iproc_clk_reg_op {
+	unsigned int offset;
+	unsigned int shift;
+	unsigned int width;
+};
+
+/*
+ * Clock gating control@the top ASIU level
+ */
+struct iproc_asiu_gate {
+	unsigned int offset;
+	unsigned int en_shift;
+};
+
+/*
+ * Control of powering on/off of a PLL
+ *
+ * Before powering off a PLL, input isolation (ISO) needs to be enabled
+ */
+struct iproc_pll_aon_pwr_ctrl {
+	unsigned int offset;
+	unsigned int pwr_width;
+	unsigned int pwr_shift;
+	unsigned int iso_shift;
+};
+
+/*
+ * Control of the PLL reset, with Ki, Kp, and Ka parameters
+ */
+struct iproc_pll_reset_ctrl {
+	unsigned int offset;
+	unsigned int reset_shift;
+	unsigned int p_reset_shift;
+	unsigned int ki_shift;
+	unsigned int ki_width;
+	unsigned int kp_shift;
+	unsigned int kp_width;
+	unsigned int ka_shift;
+	unsigned int ka_width;
+};
+
+struct iproc_pll_vco_ctrl {
+	unsigned int u_offset;
+	unsigned int l_offset;
+};
+
+/*
+ * Main PLL control parameters
+ */
+struct iproc_pll_ctrl {
+	unsigned long flags;
+	struct iproc_pll_aon_pwr_ctrl aon;
+	struct iproc_asiu_gate asiu;
+	struct iproc_pll_reset_ctrl reset;
+	struct iproc_clk_reg_op ndiv_int;
+	struct iproc_clk_reg_op ndiv_frac;
+	struct iproc_clk_reg_op pdiv;
+	struct iproc_pll_vco_ctrl vco_ctrl;
+	struct iproc_clk_reg_op status;
+};
+
+/*
+ * Controls enabling/disabling a PLL derived clock
+ */
+struct iproc_clk_enable_ctrl {
+	unsigned int offset;
+	unsigned int enable_shift;
+	unsigned int hold_shift;
+	unsigned int bypass_shift;
+};
+
+/*
+ * Main clock control parameters for clocks derived from the PLLs
+ */
+struct iproc_clk_ctrl {
+	unsigned int channel;
+	unsigned long flags;
+	struct iproc_clk_enable_ctrl enable;
+	struct iproc_clk_reg_op mdiv;
+};
+
+/*
+ * Divisor of the ASIU clocks
+ */
+struct iproc_asiu_div {
+	unsigned int offset;
+	unsigned int en_shift;
+	unsigned int high_shift;
+	unsigned int high_width;
+	unsigned int low_shift;
+	unsigned int low_width;
+};
+
+extern void __init iproc_armpll_setup(struct device_node *node);
+extern void __init iproc_pll_setup(struct device_node *node,
+		const struct iproc_pll_ctrl *ctrl,
+		const struct iproc_pll_vco_freq_param *vco_param,
+		unsigned int num_freqs);
+extern void __init iproc_clk_setup(struct device_node *node,
+		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks);
+extern void __init iproc_asiu_setup(struct device_node *node,
+		const struct iproc_asiu_div *div,
+		const struct iproc_asiu_gate *gate, unsigned int num_clks);
+
+#endif /* _CLK_IPROC_H */
-- 
1.7.9.5

[PATCH 3/4] clk: cygnus: add clock support for Broadcom Cygnus

[Ray Jui]

The Broadcom Cygnus SoC is architected under the iProc architecture. It
has the following PLLs: ARMPLL, GENPLL, LCPLL0, MIPIPLL, all dervied
from an onboard crystal. Cygnus also has various ASIU clocks that are
derived directly from the onboard crystal.

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/clk/bcm/Makefile               |    1 +
 drivers/clk/bcm/clk-cygnus.c           |  277 ++++++++++++++++++++++++++++++++
 include/dt-bindings/clock/bcm-cygnus.h |   77 +++++++++
 3 files changed, 355 insertions(+)
 create mode 100644 drivers/clk/bcm/clk-cygnus.c
 create mode 100644 include/dt-bindings/clock/bcm-cygnus.h

diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
index 6926636..afcbe55 100644
--- a/drivers/clk/bcm/Makefile
+++ b/drivers/clk/bcm/Makefile
@@ -3,3 +3,4 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
 obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
+obj-$(CONFIG_ARCH_BCM_CYGNUS)	+= clk-cygnus.o
diff --git a/drivers/clk/bcm/clk-cygnus.c b/drivers/clk/bcm/clk-cygnus.c
new file mode 100644
index 0000000..f603d1d
--- /dev/null
+++ b/drivers/clk/bcm/clk-cygnus.c
@@ -0,0 +1,277 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include <dt-bindings/clock/bcm-cygnus.h>
+#include "clk-iproc.h"
+
+#define reg_val(o, s, w) { .offset = o, .shift = s, .width = w, }
+
+#define aon_val(o, pw, ps, is) { .offset = o, .pwr_width = pw, \
+	.pwr_shift = ps, .iso_shift = is }
+
+#define asiu_div_val(o, es, hs, hw, ls, lw) \
+		{ .offset = o, .en_shift = es, .high_shift = hs, \
+		.high_width = hw, .low_shift = ls, .low_width = lw }
+
+#define reset_val(o, rs, prs, kis, kiw, kps, kpw, kas, kaw) { .offset = o, \
+	.reset_shift = rs, .p_reset_shift = prs, .ki_shift = kis, \
+	.ki_width = kiw, .kp_shift = kps, .kp_width = kpw, .ka_shift = kas, \
+	.ka_width = kaw }
+
+#define vco_ctrl_val(uo, lo) { .u_offset = uo, .l_offset = lo }
+
+#define enable_val(o, es, hs, bs) { .offset = o, .enable_shift = es, \
+	.hold_shift = hs, .bypass_shift = bs }
+
+#define asiu_gate_val(o, es) { .offset = o, .en_shift = es }
+
+static const struct iproc_pll_ctrl genpll = {
+	.flags = IPROC_CLK_AON | IPROC_CLK_PLL_HAS_NDIV_FRAC,
+	.aon = aon_val(0x0, 2, 1, 0),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 3),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static const struct iproc_pll_ctrl lcpll0 = {
+	.flags = IPROC_CLK_AON,
+	.aon = aon_val(0x0, 2, 5, 4),
+	.reset = reset_val(0x0, 31, 30, 27, 3, 23, 4, 19, 4),
+	.ndiv_int = reg_val(0x4, 16, 10),
+	.pdiv = reg_val(0x4, 26, 4),
+	.vco_ctrl = vco_ctrl_val(0x10, 0x14),
+	.status = reg_val(0x18, 12, 1),
+};
+
+/*
+ * MIPI PLL VCO frequency parameter table
+ */
+static const struct iproc_pll_vco_freq_param mipipll_vco_params[] = {
+	/* rate (Hz) ndiv_int ndiv_frac pdiv */
+	{ 750000000UL,   30,     0,        1 },
+	{ 1000000000UL,  40,     0,        1 },
+	{ 1350000000ul,  54,     0,        1 },
+	{ 2000000000UL,  80,     0,        1 },
+	{ 2100000000UL,  84,     0,        1 },
+	{ 2250000000UL,  90,     0,        1 },
+	{ 2500000000UL,  100,    0,        1 },
+	{ 2700000000UL,  54,     0,        0 },
+	{ 2975000000UL,  119,    0,        1 },
+	{ 3100000000UL,  124,    0,        1 },
+	{ 3150000000UL,  126,    0,        1 },
+};
+
+static const struct iproc_pll_ctrl mipipll = {
+	.flags = IPROC_CLK_PLL_ASIU | IPROC_CLK_PLL_HAS_NDIV_FRAC,
+	.aon = aon_val(0x0, 4, 17, 16),
+	.asiu = asiu_gate_val(0x0, 3),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 4),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static const struct iproc_clk_ctrl genpll_clk[BCM_CYGNUS_NUM_GENPLL_CLKS] = {
+	[BCM_CYGNUS_GENPLL_AXI21_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AXI21_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 6, 0, 12),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_250MHZ_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_250MHZ_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 7, 1, 13),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_IHOST_SYS_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_IHOST_SYS_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 8, 2, 14),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_GENPLL_ENET_SW_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_ENET_SW_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 9, 3, 15),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_AUDIO_125_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AUDIO_125_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 10, 4, 16),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_CAN_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_CAN_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 11, 5, 17),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static const struct iproc_clk_ctrl lcpll0_clk[BCM_CYGNUS_NUM_LCPLL0_CLKS] = {
+	[BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 7, 1, 13),
+		.mdiv = reg_val(0x8, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_DDR_PHY_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_DDR_PHY_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 8, 2, 14),
+		.mdiv = reg_val(0x8, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SDIO_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SDIO_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 9, 3, 15),
+		.mdiv = reg_val(0x8, 20, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 10, 4, 16),
+		.mdiv = reg_val(0xc, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SMART_CARD_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SMART_CARD_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 11, 5, 17),
+		.mdiv = reg_val(0xc, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_LCPLL0_CH5_UNUSED,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 12, 6, 18),
+		.mdiv = reg_val(0xc, 20, 8),
+	},
+};
+
+static const struct iproc_clk_ctrl mipipll_clk[BCM_CYGNUS_NUM_MIPIPLL_CLKS] = {
+	[BCM_CYGNUS_MIPIPLL_CH0_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH0_UNUSED,
+		.enable = enable_val(0x4, 12, 6, 18),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH1_LCD] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH1_LCD,
+		.enable = enable_val(0x4, 13, 7, 19),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH2_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH2_UNUSED,
+		.enable = enable_val(0x4, 14, 8, 20),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH3_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH3_UNUSED,
+		.enable = enable_val(0x4, 15, 9, 21),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH4_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH4_UNUSED,
+		.enable = enable_val(0x4, 16, 10, 22),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH5_UNUSED,
+		.enable = enable_val(0x4, 17, 11, 23),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static const struct iproc_asiu_div asiu_div[BCM_CYGNUS_NUM_ASIU_CLKS] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
+		asiu_div_val(0x0, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_ADC_CLK] =
+		asiu_div_val(0x4, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_PWM_CLK] =
+		asiu_div_val(0x8, 31, 16, 10, 0, 10),
+};
+
+static const struct iproc_asiu_gate asiu_gate[BCM_CYGNUS_NUM_ASIU_CLKS] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
+		asiu_gate_val(0x0, 7),
+	[BCM_CYGNUS_ASIU_ADC_CLK] =
+		asiu_gate_val(0x0, 9),
+	[BCM_CYGNUS_ASIU_PWM_CLK] =
+		asiu_gate_val(IPROC_CLK_INVALID_OFFSET, 0),
+};
+
+static void __init cygnus_armpll_init(struct device_node *node)
+{
+	iproc_armpll_setup(node);
+}
+CLK_OF_DECLARE(cygnus_armpll, "brcm,cygnus-armpll", cygnus_armpll_init);
+
+static void __init cygnus_genpll_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &genpll, NULL, 0);
+}
+CLK_OF_DECLARE(cygnus_genpll, "brcm,cygnus-genpll", cygnus_genpll_init);
+
+static void __init cygnus_lcpll0_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &lcpll0, NULL, 0);
+}
+CLK_OF_DECLARE(cygnus_lcpll0, "brcm,cygnus-lcpll0", cygnus_lcpll0_init);
+
+static void __init cygnus_mipipll_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &mipipll, mipipll_vco_params,
+			ARRAY_SIZE(mipipll_vco_params));
+}
+CLK_OF_DECLARE(cygnus_mipipll, "brcm,cygnus-mipipll", cygnus_mipipll_init);
+
+static void __init cygnus_genpll_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, genpll_clk, BCM_CYGNUS_NUM_GENPLL_CLKS);
+}
+CLK_OF_DECLARE(cygnus_genpll_clk, "brcm,cygnus-genpll-clk",
+		cygnus_genpll_clk_init);
+
+static void __init cygnus_lcpll0_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, lcpll0_clk, BCM_CYGNUS_NUM_LCPLL0_CLKS);
+}
+CLK_OF_DECLARE(cygnus_lcpll0_clk, "brcm,cygnus-lcpll0-clk",
+		cygnus_lcpll0_clk_init);
+
+static void __init cygnus_mipipll_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, mipipll_clk, BCM_CYGNUS_NUM_MIPIPLL_CLKS);
+}
+CLK_OF_DECLARE(cygnus_mipipll_clk, "brcm,cygnus-mipipll-clk",
+		cygnus_mipipll_clk_init);
+
+static void __init cygnus_asiu_init(struct device_node *node)
+{
+	iproc_asiu_setup(node, asiu_div, asiu_gate, BCM_CYGNUS_NUM_ASIU_CLKS);
+}
+CLK_OF_DECLARE(cygnus_asiu_clk, "brcm,cygnus-asiu-clk", cygnus_asiu_init);
diff --git a/include/dt-bindings/clock/bcm-cygnus.h b/include/dt-bindings/clock/bcm-cygnus.h
new file mode 100644
index 0000000..45948b6
--- /dev/null
+++ b/include/dt-bindings/clock/bcm-cygnus.h
@@ -0,0 +1,77 @@
+/*
+ *  BSD LICENSE
+ *
+ *  Copyright(c) 2014 Broadcom Corporation.  All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in
+ *      the documentation and/or other materials provided with the
+ *      distribution.
+ *    * Neither the name of Broadcom Corporation nor the names of its
+ *      contributors may be used to endorse or promote products derived
+ *      from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _CLOCK_BCM_CYGNUS_H
+#define _CLOCK_BCM_CYGNUS_H
+
+/* number of GENPLL clocks */
+#define BCM_CYGNUS_NUM_GENPLL_CLKS 6
+
+/* GENPLL clock channel ID */
+#define BCM_CYGNUS_GENPLL_AXI21_CLK          0
+#define BCM_CYGNUS_GENPLL_250MHZ_CLK         1
+#define BCM_CYGNUS_GENPLL_IHOST_SYS_CLK      2
+#define BCM_CYGNUS_GENPLL_ENET_SW_CLK        3
+#define BCM_CYGNUS_GENPLL_AUDIO_125_CLK      4
+#define BCM_CYGNUS_GENPLL_CAN_CLK            5
+
+/* number of LCPLL0 clocks */
+#define BCM_CYGNUS_NUM_LCPLL0_CLKS 6
+
+/* LCPLL0 clock channel ID */
+#define BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK    0
+#define BCM_CYGNUS_LCPLL0_DDR_PHY_CLK         1
+#define BCM_CYGNUS_LCPLL0_SDIO_CLK            2
+#define BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK     3
+#define BCM_CYGNUS_LCPLL0_SMART_CARD_CLK      4
+#define BCM_CYGNUS_LCPLL0_CH5_UNUSED          5
+
+/* number of MIPI PLL clocks */
+#define BCM_CYGNUS_NUM_MIPIPLL_CLKS 6
+
+/* MIPI PLL clock channel ID */
+#define BCM_CYGNUS_MIPIPLL_CH0_UNUSED         0
+#define BCM_CYGNUS_MIPIPLL_CH1_LCD            1
+#define BCM_CYGNUS_MIPIPLL_CH2_UNUSED         2
+#define BCM_CYGNUS_MIPIPLL_CH3_UNUSED         3
+#define BCM_CYGNUS_MIPIPLL_CH4_UNUSED         4
+#define BCM_CYGNUS_MIPIPLL_CH5_UNUSED         5
+
+/* number of ASIU clocks */
+#define BCM_CYGNUS_NUM_ASIU_CLKS 3
+
+/* ASIU clock IDs */
+#define BCM_CYGNUS_ASIU_KEYPAD_CLK    0
+#define BCM_CYGNUS_ASIU_ADC_CLK       1
+#define BCM_CYGNUS_ASIU_PWM_CLK       2
+
+#endif /* _CLOCK_BCM_CYGNUS_H */
-- 
1.7.9.5

[PATCH 3/4] clk: cygnus: add clock support for Broadcom Cygnus

[Ray Jui]

The Broadcom Cygnus SoC is architected under the iProc architecture. It
has the following PLLs: ARMPLL, GENPLL, LCPLL0, MIPIPLL, all dervied
from an onboard crystal. Cygnus also has various ASIU clocks that are
derived directly from the onboard crystal.

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/clk/bcm/Makefile               |    1 +
 drivers/clk/bcm/clk-cygnus.c           |  277 ++++++++++++++++++++++++++++++++
 include/dt-bindings/clock/bcm-cygnus.h |   77 +++++++++
 3 files changed, 355 insertions(+)
 create mode 100644 drivers/clk/bcm/clk-cygnus.c
 create mode 100644 include/dt-bindings/clock/bcm-cygnus.h

diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
index 6926636..afcbe55 100644
--- a/drivers/clk/bcm/Makefile
+++ b/drivers/clk/bcm/Makefile
@@ -3,3 +3,4 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
 obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
+obj-$(CONFIG_ARCH_BCM_CYGNUS)	+= clk-cygnus.o
diff --git a/drivers/clk/bcm/clk-cygnus.c b/drivers/clk/bcm/clk-cygnus.c
new file mode 100644
index 0000000..f603d1d
--- /dev/null
+++ b/drivers/clk/bcm/clk-cygnus.c
@@ -0,0 +1,277 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include <dt-bindings/clock/bcm-cygnus.h>
+#include "clk-iproc.h"
+
+#define reg_val(o, s, w) { .offset = o, .shift = s, .width = w, }
+
+#define aon_val(o, pw, ps, is) { .offset = o, .pwr_width = pw, \
+	.pwr_shift = ps, .iso_shift = is }
+
+#define asiu_div_val(o, es, hs, hw, ls, lw) \
+		{ .offset = o, .en_shift = es, .high_shift = hs, \
+		.high_width = hw, .low_shift = ls, .low_width = lw }
+
+#define reset_val(o, rs, prs, kis, kiw, kps, kpw, kas, kaw) { .offset = o, \
+	.reset_shift = rs, .p_reset_shift = prs, .ki_shift = kis, \
+	.ki_width = kiw, .kp_shift = kps, .kp_width = kpw, .ka_shift = kas, \
+	.ka_width = kaw }
+
+#define vco_ctrl_val(uo, lo) { .u_offset = uo, .l_offset = lo }
+
+#define enable_val(o, es, hs, bs) { .offset = o, .enable_shift = es, \
+	.hold_shift = hs, .bypass_shift = bs }
+
+#define asiu_gate_val(o, es) { .offset = o, .en_shift = es }
+
+static const struct iproc_pll_ctrl genpll = {
+	.flags = IPROC_CLK_AON | IPROC_CLK_PLL_HAS_NDIV_FRAC,
+	.aon = aon_val(0x0, 2, 1, 0),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 3),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static const struct iproc_pll_ctrl lcpll0 = {
+	.flags = IPROC_CLK_AON,
+	.aon = aon_val(0x0, 2, 5, 4),
+	.reset = reset_val(0x0, 31, 30, 27, 3, 23, 4, 19, 4),
+	.ndiv_int = reg_val(0x4, 16, 10),
+	.pdiv = reg_val(0x4, 26, 4),
+	.vco_ctrl = vco_ctrl_val(0x10, 0x14),
+	.status = reg_val(0x18, 12, 1),
+};
+
+/*
+ * MIPI PLL VCO frequency parameter table
+ */
+static const struct iproc_pll_vco_freq_param mipipll_vco_params[] = {
+	/* rate (Hz) ndiv_int ndiv_frac pdiv */
+	{ 750000000UL,   30,     0,        1 },
+	{ 1000000000UL,  40,     0,        1 },
+	{ 1350000000ul,  54,     0,        1 },
+	{ 2000000000UL,  80,     0,        1 },
+	{ 2100000000UL,  84,     0,        1 },
+	{ 2250000000UL,  90,     0,        1 },
+	{ 2500000000UL,  100,    0,        1 },
+	{ 2700000000UL,  54,     0,        0 },
+	{ 2975000000UL,  119,    0,        1 },
+	{ 3100000000UL,  124,    0,        1 },
+	{ 3150000000UL,  126,    0,        1 },
+};
+
+static const struct iproc_pll_ctrl mipipll = {
+	.flags = IPROC_CLK_PLL_ASIU | IPROC_CLK_PLL_HAS_NDIV_FRAC,
+	.aon = aon_val(0x0, 4, 17, 16),
+	.asiu = asiu_gate_val(0x0, 3),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 4),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static const struct iproc_clk_ctrl genpll_clk[BCM_CYGNUS_NUM_GENPLL_CLKS] = {
+	[BCM_CYGNUS_GENPLL_AXI21_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AXI21_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 6, 0, 12),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_250MHZ_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_250MHZ_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 7, 1, 13),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_IHOST_SYS_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_IHOST_SYS_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 8, 2, 14),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_GENPLL_ENET_SW_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_ENET_SW_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 9, 3, 15),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_AUDIO_125_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AUDIO_125_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 10, 4, 16),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_CAN_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_CAN_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 11, 5, 17),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static const struct iproc_clk_ctrl lcpll0_clk[BCM_CYGNUS_NUM_LCPLL0_CLKS] = {
+	[BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 7, 1, 13),
+		.mdiv = reg_val(0x8, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_DDR_PHY_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_DDR_PHY_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 8, 2, 14),
+		.mdiv = reg_val(0x8, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SDIO_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SDIO_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 9, 3, 15),
+		.mdiv = reg_val(0x8, 20, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 10, 4, 16),
+		.mdiv = reg_val(0xc, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SMART_CARD_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SMART_CARD_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 11, 5, 17),
+		.mdiv = reg_val(0xc, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_LCPLL0_CH5_UNUSED,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 12, 6, 18),
+		.mdiv = reg_val(0xc, 20, 8),
+	},
+};
+
+static const struct iproc_clk_ctrl mipipll_clk[BCM_CYGNUS_NUM_MIPIPLL_CLKS] = {
+	[BCM_CYGNUS_MIPIPLL_CH0_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH0_UNUSED,
+		.enable = enable_val(0x4, 12, 6, 18),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH1_LCD] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH1_LCD,
+		.enable = enable_val(0x4, 13, 7, 19),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH2_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH2_UNUSED,
+		.enable = enable_val(0x4, 14, 8, 20),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH3_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH3_UNUSED,
+		.enable = enable_val(0x4, 15, 9, 21),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH4_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH4_UNUSED,
+		.enable = enable_val(0x4, 16, 10, 22),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH5_UNUSED,
+		.enable = enable_val(0x4, 17, 11, 23),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static const struct iproc_asiu_div asiu_div[BCM_CYGNUS_NUM_ASIU_CLKS] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
+		asiu_div_val(0x0, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_ADC_CLK] =
+		asiu_div_val(0x4, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_PWM_CLK] =
+		asiu_div_val(0x8, 31, 16, 10, 0, 10),
+};
+
+static const struct iproc_asiu_gate asiu_gate[BCM_CYGNUS_NUM_ASIU_CLKS] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
+		asiu_gate_val(0x0, 7),
+	[BCM_CYGNUS_ASIU_ADC_CLK] =
+		asiu_gate_val(0x0, 9),
+	[BCM_CYGNUS_ASIU_PWM_CLK] =
+		asiu_gate_val(IPROC_CLK_INVALID_OFFSET, 0),
+};
+
+static void __init cygnus_armpll_init(struct device_node *node)
+{
+	iproc_armpll_setup(node);
+}
+CLK_OF_DECLARE(cygnus_armpll, "brcm,cygnus-armpll", cygnus_armpll_init);
+
+static void __init cygnus_genpll_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &genpll, NULL, 0);
+}
+CLK_OF_DECLARE(cygnus_genpll, "brcm,cygnus-genpll", cygnus_genpll_init);
+
+static void __init cygnus_lcpll0_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &lcpll0, NULL, 0);
+}
+CLK_OF_DECLARE(cygnus_lcpll0, "brcm,cygnus-lcpll0", cygnus_lcpll0_init);
+
+static void __init cygnus_mipipll_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &mipipll, mipipll_vco_params,
+			ARRAY_SIZE(mipipll_vco_params));
+}
+CLK_OF_DECLARE(cygnus_mipipll, "brcm,cygnus-mipipll", cygnus_mipipll_init);
+
+static void __init cygnus_genpll_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, genpll_clk, BCM_CYGNUS_NUM_GENPLL_CLKS);
+}
+CLK_OF_DECLARE(cygnus_genpll_clk, "brcm,cygnus-genpll-clk",
+		cygnus_genpll_clk_init);
+
+static void __init cygnus_lcpll0_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, lcpll0_clk, BCM_CYGNUS_NUM_LCPLL0_CLKS);
+}
+CLK_OF_DECLARE(cygnus_lcpll0_clk, "brcm,cygnus-lcpll0-clk",
+		cygnus_lcpll0_clk_init);
+
+static void __init cygnus_mipipll_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, mipipll_clk, BCM_CYGNUS_NUM_MIPIPLL_CLKS);
+}
+CLK_OF_DECLARE(cygnus_mipipll_clk, "brcm,cygnus-mipipll-clk",
+		cygnus_mipipll_clk_init);
+
+static void __init cygnus_asiu_init(struct device_node *node)
+{
+	iproc_asiu_setup(node, asiu_div, asiu_gate, BCM_CYGNUS_NUM_ASIU_CLKS);
+}
+CLK_OF_DECLARE(cygnus_asiu_clk, "brcm,cygnus-asiu-clk", cygnus_asiu_init);
diff --git a/include/dt-bindings/clock/bcm-cygnus.h b/include/dt-bindings/clock/bcm-cygnus.h
new file mode 100644
index 0000000..45948b6
--- /dev/null
+++ b/include/dt-bindings/clock/bcm-cygnus.h
@@ -0,0 +1,77 @@
+/*
+ *  BSD LICENSE
+ *
+ *  Copyright(c) 2014 Broadcom Corporation.  All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in
+ *      the documentation and/or other materials provided with the
+ *      distribution.
+ *    * Neither the name of Broadcom Corporation nor the names of its
+ *      contributors may be used to endorse or promote products derived
+ *      from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _CLOCK_BCM_CYGNUS_H
+#define _CLOCK_BCM_CYGNUS_H
+
+/* number of GENPLL clocks */
+#define BCM_CYGNUS_NUM_GENPLL_CLKS 6
+
+/* GENPLL clock channel ID */
+#define BCM_CYGNUS_GENPLL_AXI21_CLK          0
+#define BCM_CYGNUS_GENPLL_250MHZ_CLK         1
+#define BCM_CYGNUS_GENPLL_IHOST_SYS_CLK      2
+#define BCM_CYGNUS_GENPLL_ENET_SW_CLK        3
+#define BCM_CYGNUS_GENPLL_AUDIO_125_CLK      4
+#define BCM_CYGNUS_GENPLL_CAN_CLK            5
+
+/* number of LCPLL0 clocks */
+#define BCM_CYGNUS_NUM_LCPLL0_CLKS 6
+
+/* LCPLL0 clock channel ID */
+#define BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK    0
+#define BCM_CYGNUS_LCPLL0_DDR_PHY_CLK         1
+#define BCM_CYGNUS_LCPLL0_SDIO_CLK            2
+#define BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK     3
+#define BCM_CYGNUS_LCPLL0_SMART_CARD_CLK      4
+#define BCM_CYGNUS_LCPLL0_CH5_UNUSED          5
+
+/* number of MIPI PLL clocks */
+#define BCM_CYGNUS_NUM_MIPIPLL_CLKS 6
+
+/* MIPI PLL clock channel ID */
+#define BCM_CYGNUS_MIPIPLL_CH0_UNUSED         0
+#define BCM_CYGNUS_MIPIPLL_CH1_LCD            1
+#define BCM_CYGNUS_MIPIPLL_CH2_UNUSED         2
+#define BCM_CYGNUS_MIPIPLL_CH3_UNUSED         3
+#define BCM_CYGNUS_MIPIPLL_CH4_UNUSED         4
+#define BCM_CYGNUS_MIPIPLL_CH5_UNUSED         5
+
+/* number of ASIU clocks */
+#define BCM_CYGNUS_NUM_ASIU_CLKS 3
+
+/* ASIU clock IDs */
+#define BCM_CYGNUS_ASIU_KEYPAD_CLK    0
+#define BCM_CYGNUS_ASIU_ADC_CLK       1
+#define BCM_CYGNUS_ASIU_PWM_CLK       2
+
+#endif /* _CLOCK_BCM_CYGNUS_H */
-- 
1.7.9.5

[PATCH 3/4] clk: cygnus: add clock support for Broadcom Cygnus

[Ray Jui]

The Broadcom Cygnus SoC is architected under the iProc architecture. It
has the following PLLs: ARMPLL, GENPLL, LCPLL0, MIPIPLL, all dervied
from an onboard crystal. Cygnus also has various ASIU clocks that are
derived directly from the onboard crystal.

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/clk/bcm/Makefile               |    1 +
 drivers/clk/bcm/clk-cygnus.c           |  277 ++++++++++++++++++++++++++++++++
 include/dt-bindings/clock/bcm-cygnus.h |   77 +++++++++
 3 files changed, 355 insertions(+)
 create mode 100644 drivers/clk/bcm/clk-cygnus.c
 create mode 100644 include/dt-bindings/clock/bcm-cygnus.h

diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
index 6926636..afcbe55 100644
--- a/drivers/clk/bcm/Makefile
+++ b/drivers/clk/bcm/Makefile
@@ -3,3 +3,4 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
 obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
+obj-$(CONFIG_ARCH_BCM_CYGNUS)	+= clk-cygnus.o
diff --git a/drivers/clk/bcm/clk-cygnus.c b/drivers/clk/bcm/clk-cygnus.c
new file mode 100644
index 0000000..f603d1d
--- /dev/null
+++ b/drivers/clk/bcm/clk-cygnus.c
@@ -0,0 +1,277 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include <dt-bindings/clock/bcm-cygnus.h>
+#include "clk-iproc.h"
+
+#define reg_val(o, s, w) { .offset = o, .shift = s, .width = w, }
+
+#define aon_val(o, pw, ps, is) { .offset = o, .pwr_width = pw, \
+	.pwr_shift = ps, .iso_shift = is }
+
+#define asiu_div_val(o, es, hs, hw, ls, lw) \
+		{ .offset = o, .en_shift = es, .high_shift = hs, \
+		.high_width = hw, .low_shift = ls, .low_width = lw }
+
+#define reset_val(o, rs, prs, kis, kiw, kps, kpw, kas, kaw) { .offset = o, \
+	.reset_shift = rs, .p_reset_shift = prs, .ki_shift = kis, \
+	.ki_width = kiw, .kp_shift = kps, .kp_width = kpw, .ka_shift = kas, \
+	.ka_width = kaw }
+
+#define vco_ctrl_val(uo, lo) { .u_offset = uo, .l_offset = lo }
+
+#define enable_val(o, es, hs, bs) { .offset = o, .enable_shift = es, \
+	.hold_shift = hs, .bypass_shift = bs }
+
+#define asiu_gate_val(o, es) { .offset = o, .en_shift = es }
+
+static const struct iproc_pll_ctrl genpll = {
+	.flags = IPROC_CLK_AON | IPROC_CLK_PLL_HAS_NDIV_FRAC,
+	.aon = aon_val(0x0, 2, 1, 0),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 3),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static const struct iproc_pll_ctrl lcpll0 = {
+	.flags = IPROC_CLK_AON,
+	.aon = aon_val(0x0, 2, 5, 4),
+	.reset = reset_val(0x0, 31, 30, 27, 3, 23, 4, 19, 4),
+	.ndiv_int = reg_val(0x4, 16, 10),
+	.pdiv = reg_val(0x4, 26, 4),
+	.vco_ctrl = vco_ctrl_val(0x10, 0x14),
+	.status = reg_val(0x18, 12, 1),
+};
+
+/*
+ * MIPI PLL VCO frequency parameter table
+ */
+static const struct iproc_pll_vco_freq_param mipipll_vco_params[] = {
+	/* rate (Hz) ndiv_int ndiv_frac pdiv */
+	{ 750000000UL,   30,     0,        1 },
+	{ 1000000000UL,  40,     0,        1 },
+	{ 1350000000ul,  54,     0,        1 },
+	{ 2000000000UL,  80,     0,        1 },
+	{ 2100000000UL,  84,     0,        1 },
+	{ 2250000000UL,  90,     0,        1 },
+	{ 2500000000UL,  100,    0,        1 },
+	{ 2700000000UL,  54,     0,        0 },
+	{ 2975000000UL,  119,    0,        1 },
+	{ 3100000000UL,  124,    0,        1 },
+	{ 3150000000UL,  126,    0,        1 },
+};
+
+static const struct iproc_pll_ctrl mipipll = {
+	.flags = IPROC_CLK_PLL_ASIU | IPROC_CLK_PLL_HAS_NDIV_FRAC,
+	.aon = aon_val(0x0, 4, 17, 16),
+	.asiu = asiu_gate_val(0x0, 3),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 4),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static const struct iproc_clk_ctrl genpll_clk[BCM_CYGNUS_NUM_GENPLL_CLKS] = {
+	[BCM_CYGNUS_GENPLL_AXI21_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AXI21_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 6, 0, 12),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_250MHZ_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_250MHZ_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 7, 1, 13),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_IHOST_SYS_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_IHOST_SYS_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 8, 2, 14),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_GENPLL_ENET_SW_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_ENET_SW_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 9, 3, 15),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_AUDIO_125_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AUDIO_125_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 10, 4, 16),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_CAN_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_CAN_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 11, 5, 17),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static const struct iproc_clk_ctrl lcpll0_clk[BCM_CYGNUS_NUM_LCPLL0_CLKS] = {
+	[BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 7, 1, 13),
+		.mdiv = reg_val(0x8, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_DDR_PHY_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_DDR_PHY_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 8, 2, 14),
+		.mdiv = reg_val(0x8, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SDIO_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SDIO_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 9, 3, 15),
+		.mdiv = reg_val(0x8, 20, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 10, 4, 16),
+		.mdiv = reg_val(0xc, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SMART_CARD_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SMART_CARD_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 11, 5, 17),
+		.mdiv = reg_val(0xc, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_LCPLL0_CH5_UNUSED,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 12, 6, 18),
+		.mdiv = reg_val(0xc, 20, 8),
+	},
+};
+
+static const struct iproc_clk_ctrl mipipll_clk[BCM_CYGNUS_NUM_MIPIPLL_CLKS] = {
+	[BCM_CYGNUS_MIPIPLL_CH0_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH0_UNUSED,
+		.enable = enable_val(0x4, 12, 6, 18),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH1_LCD] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH1_LCD,
+		.enable = enable_val(0x4, 13, 7, 19),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH2_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH2_UNUSED,
+		.enable = enable_val(0x4, 14, 8, 20),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH3_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH3_UNUSED,
+		.enable = enable_val(0x4, 15, 9, 21),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH4_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH4_UNUSED,
+		.enable = enable_val(0x4, 16, 10, 22),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH5_UNUSED,
+		.enable = enable_val(0x4, 17, 11, 23),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static const struct iproc_asiu_div asiu_div[BCM_CYGNUS_NUM_ASIU_CLKS] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
+		asiu_div_val(0x0, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_ADC_CLK] =
+		asiu_div_val(0x4, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_PWM_CLK] =
+		asiu_div_val(0x8, 31, 16, 10, 0, 10),
+};
+
+static const struct iproc_asiu_gate asiu_gate[BCM_CYGNUS_NUM_ASIU_CLKS] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
+		asiu_gate_val(0x0, 7),
+	[BCM_CYGNUS_ASIU_ADC_CLK] =
+		asiu_gate_val(0x0, 9),
+	[BCM_CYGNUS_ASIU_PWM_CLK] =
+		asiu_gate_val(IPROC_CLK_INVALID_OFFSET, 0),
+};
+
+static void __init cygnus_armpll_init(struct device_node *node)
+{
+	iproc_armpll_setup(node);
+}
+CLK_OF_DECLARE(cygnus_armpll, "brcm,cygnus-armpll", cygnus_armpll_init);
+
+static void __init cygnus_genpll_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &genpll, NULL, 0);
+}
+CLK_OF_DECLARE(cygnus_genpll, "brcm,cygnus-genpll", cygnus_genpll_init);
+
+static void __init cygnus_lcpll0_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &lcpll0, NULL, 0);
+}
+CLK_OF_DECLARE(cygnus_lcpll0, "brcm,cygnus-lcpll0", cygnus_lcpll0_init);
+
+static void __init cygnus_mipipll_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &mipipll, mipipll_vco_params,
+			ARRAY_SIZE(mipipll_vco_params));
+}
+CLK_OF_DECLARE(cygnus_mipipll, "brcm,cygnus-mipipll", cygnus_mipipll_init);
+
+static void __init cygnus_genpll_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, genpll_clk, BCM_CYGNUS_NUM_GENPLL_CLKS);
+}
+CLK_OF_DECLARE(cygnus_genpll_clk, "brcm,cygnus-genpll-clk",
+		cygnus_genpll_clk_init);
+
+static void __init cygnus_lcpll0_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, lcpll0_clk, BCM_CYGNUS_NUM_LCPLL0_CLKS);
+}
+CLK_OF_DECLARE(cygnus_lcpll0_clk, "brcm,cygnus-lcpll0-clk",
+		cygnus_lcpll0_clk_init);
+
+static void __init cygnus_mipipll_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, mipipll_clk, BCM_CYGNUS_NUM_MIPIPLL_CLKS);
+}
+CLK_OF_DECLARE(cygnus_mipipll_clk, "brcm,cygnus-mipipll-clk",
+		cygnus_mipipll_clk_init);
+
+static void __init cygnus_asiu_init(struct device_node *node)
+{
+	iproc_asiu_setup(node, asiu_div, asiu_gate, BCM_CYGNUS_NUM_ASIU_CLKS);
+}
+CLK_OF_DECLARE(cygnus_asiu_clk, "brcm,cygnus-asiu-clk", cygnus_asiu_init);
diff --git a/include/dt-bindings/clock/bcm-cygnus.h b/include/dt-bindings/clock/bcm-cygnus.h
new file mode 100644
index 0000000..45948b6
--- /dev/null
+++ b/include/dt-bindings/clock/bcm-cygnus.h
@@ -0,0 +1,77 @@
+/*
+ *  BSD LICENSE
+ *
+ *  Copyright(c) 2014 Broadcom Corporation.  All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in
+ *      the documentation and/or other materials provided with the
+ *      distribution.
+ *    * Neither the name of Broadcom Corporation nor the names of its
+ *      contributors may be used to endorse or promote products derived
+ *      from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _CLOCK_BCM_CYGNUS_H
+#define _CLOCK_BCM_CYGNUS_H
+
+/* number of GENPLL clocks */
+#define BCM_CYGNUS_NUM_GENPLL_CLKS 6
+
+/* GENPLL clock channel ID */
+#define BCM_CYGNUS_GENPLL_AXI21_CLK          0
+#define BCM_CYGNUS_GENPLL_250MHZ_CLK         1
+#define BCM_CYGNUS_GENPLL_IHOST_SYS_CLK      2
+#define BCM_CYGNUS_GENPLL_ENET_SW_CLK        3
+#define BCM_CYGNUS_GENPLL_AUDIO_125_CLK      4
+#define BCM_CYGNUS_GENPLL_CAN_CLK            5
+
+/* number of LCPLL0 clocks */
+#define BCM_CYGNUS_NUM_LCPLL0_CLKS 6
+
+/* LCPLL0 clock channel ID */
+#define BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK    0
+#define BCM_CYGNUS_LCPLL0_DDR_PHY_CLK         1
+#define BCM_CYGNUS_LCPLL0_SDIO_CLK            2
+#define BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK     3
+#define BCM_CYGNUS_LCPLL0_SMART_CARD_CLK      4
+#define BCM_CYGNUS_LCPLL0_CH5_UNUSED          5
+
+/* number of MIPI PLL clocks */
+#define BCM_CYGNUS_NUM_MIPIPLL_CLKS 6
+
+/* MIPI PLL clock channel ID */
+#define BCM_CYGNUS_MIPIPLL_CH0_UNUSED         0
+#define BCM_CYGNUS_MIPIPLL_CH1_LCD            1
+#define BCM_CYGNUS_MIPIPLL_CH2_UNUSED         2
+#define BCM_CYGNUS_MIPIPLL_CH3_UNUSED         3
+#define BCM_CYGNUS_MIPIPLL_CH4_UNUSED         4
+#define BCM_CYGNUS_MIPIPLL_CH5_UNUSED         5
+
+/* number of ASIU clocks */
+#define BCM_CYGNUS_NUM_ASIU_CLKS 3
+
+/* ASIU clock IDs */
+#define BCM_CYGNUS_ASIU_KEYPAD_CLK    0
+#define BCM_CYGNUS_ASIU_ADC_CLK       1
+#define BCM_CYGNUS_ASIU_PWM_CLK       2
+
+#endif /* _CLOCK_BCM_CYGNUS_H */
-- 
1.7.9.5

[PATCH 4/4] ARM: dts: enable clock support for Broadcom Cygnus

[Ray Jui]

Replace current device tree dummy clocks with real clock support for
Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbraden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus-clock.dtsi |  110 ++++++++++++++++++++++++-------
 arch/arm/boot/dts/bcm-cygnus.dtsi       |    2 +-
 2 files changed, 86 insertions(+), 26 deletions(-)

diff --git a/arch/arm/boot/dts/bcm-cygnus-clock.dtsi b/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
index 60d8389..f2da5e2 100644
--- a/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
@@ -36,56 +36,116 @@ clocks {
 	ranges;
 
 	osc: oscillator {
+		#clock-cells = <0>;
 		compatible = "fixed-clock";
-		#clock-cells = <1>;
 		clock-frequency = <25000000>;
 	};
 
-	apb_clk: apb_clk {
-		compatible = "fixed-clock";
+	/* Cygnus ARM PLL */
+	armpll: armpll {
 		#clock-cells = <0>;
-		clock-frequency = <1000000000>;
+		compatible = "brcm,cygnus-armpll";
+		clocks = <&osc>;
+		reg = <0x19000000 0x1000>;
 	};
 
-	periph_clk: periph_clk {
-		compatible = "fixed-clock";
+	/* peripheral clock for system timer */
+	arm_periph_clk: arm_periph_clk {
 		#clock-cells = <0>;
-		clock-frequency = <500000000>;
+		compatible = "fixed-factor-clock";
+		clocks = <&armpll>;
+		clock-div = <2>;
+		clock-mult = <1>;
 	};
 
-	sdio_clk: lcpll_ch2 {
-		compatible = "fixed-clock";
+	/* APB bus clock */
+	apb_clk: apb_clk {
 		#clock-cells = <0>;
-		clock-frequency = <200000000>;
+		compatible = "fixed-factor-clock";
+		clocks = <&armpll>;
+		clock-div = <4>;
+		clock-mult = <1>;
 	};
 
-	axi81_clk: axi81_clk {
-		compatible = "fixed-clock";
+	genpll: genpll {
 		#clock-cells = <0>;
-		clock-frequency = <100000000>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
 	};
 
-	keypad_clk: keypad_clk {
-		compatible = "fixed-clock";
+	/* various clocks running off the GENPLL */
+	genpll_clks: genpll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-genpll-clk";
+		reg = <0x0301d000 0x2c>;
+		clocks = <&genpll>;
+		clock-output-names = "axi21", "250mhz", "ihost_sys",
+			"enet_sw", "audio_125", "can";
+	};
+
+	/* always 1/2 of the axi21 clock */
+	axi41_clk: axi41_clk {
 		#clock-cells = <0>;
-		clock-frequency = <31806>;
+		compatible = "fixed-factor-clock";
+		clocks = <&genpll_clks 0>;
+		clock-div = <2>;
+		clock-mult = <1>;
 	};
 
-	adc_clk: adc_clk {
-		compatible = "fixed-clock";
+	/* always 1/4 of the axi21 clock */
+	axi81_clk: axi81_clk {
 		#clock-cells = <0>;
-		clock-frequency = <1562500>;
+		compatible = "fixed-factor-clock";
+		clocks = <&genpll_clks 0>;
+		clock-div = <4>;
+		clock-mult = <1>;
 	};
 
-	pwm_clk: pwm_clk {
-		compatible = "fixed-clock";
+	lcpll0: lcpll0 {
 		#clock-cells = <0>;
-		clock-frequency = <1000000>;
+		compatible = "brcm,cygnus-lcpll0";
+		reg = <0x0301d02c 0x1c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
 	};
 
-	lcd_clk: mipipll_ch1 {
-		compatible = "fixed-clock";
+	/* various clocks running off the LCPLL0 */
+	lcpll0_clks: lcpll0_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-lcpll0-clk";
+		reg = <0x0301d02c 0x1c>;
+		clocks = <&lcpll0>;
+		clock-output-names = "pcie_phy", "ddr_phy", "sdio",
+			"usb_phy", "smart_card", "ch5";
+	};
+
+	mipipll: mipipll {
 		#clock-cells = <0>;
-		clock-frequency = <100000000>;
+		compatible = "brcm,cygnus-mipipll";
+		reg = <0x180a9800 0x2c>,
+			<0x0301c020 0x4>,
+			<0x180aa024 0x4>;
+		clock-frequency = <1350000000>;
+		clocks = <&osc>;
+	};
+
+	mipipll_clks: mipipll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-mipipll-clk";
+		reg = <0x180a9800 0x2c>;
+		clocks = <&mipipll>;
+		clock-output-names = "ch0_unused", "ch1_lcd", "ch2_unused",
+			"ch3_unused", "ch4_unused", "ch5_unused";
+	};
+
+	asiu_clks: asiu_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-asiu-clk";
+		reg = <0x0301d048 0xc>,
+			<0x180aa024 0x4>;
+		clocks = <&osc>;
+		clock-output-names = "keypad", "adc/touch", "pwm";
 	};
 };
diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..2b99e9c 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -134,7 +134,7 @@
 		compatible = "arm,cortex-a9-global-timer";
 		reg = <0x19020200 0x100>;
 		interrupts = <GIC_PPI 11 IRQ_TYPE_LEVEL_HIGH>;
-		clocks = <&periph_clk>;
+		clocks = <&arm_periph_clk>;
 	};
 
 };
-- 
1.7.9.5

[PATCH 4/4] ARM: dts: enable clock support for Broadcom Cygnus

[Ray Jui]

Replace current device tree dummy clocks with real clock support for
Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbraden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus-clock.dtsi |  110 ++++++++++++++++++++++++-------
 arch/arm/boot/dts/bcm-cygnus.dtsi       |    2 +-
 2 files changed, 86 insertions(+), 26 deletions(-)

diff --git a/arch/arm/boot/dts/bcm-cygnus-clock.dtsi b/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
index 60d8389..f2da5e2 100644
--- a/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
@@ -36,56 +36,116 @@ clocks {
 	ranges;
 
 	osc: oscillator {
+		#clock-cells = <0>;
 		compatible = "fixed-clock";
-		#clock-cells = <1>;
 		clock-frequency = <25000000>;
 	};
 
-	apb_clk: apb_clk {
-		compatible = "fixed-clock";
+	/* Cygnus ARM PLL */
+	armpll: armpll {
 		#clock-cells = <0>;
-		clock-frequency = <1000000000>;
+		compatible = "brcm,cygnus-armpll";
+		clocks = <&osc>;
+		reg = <0x19000000 0x1000>;
 	};
 
-	periph_clk: periph_clk {
-		compatible = "fixed-clock";
+	/* peripheral clock for system timer */
+	arm_periph_clk: arm_periph_clk {
 		#clock-cells = <0>;
-		clock-frequency = <500000000>;
+		compatible = "fixed-factor-clock";
+		clocks = <&armpll>;
+		clock-div = <2>;
+		clock-mult = <1>;
 	};
 
-	sdio_clk: lcpll_ch2 {
-		compatible = "fixed-clock";
+	/* APB bus clock */
+	apb_clk: apb_clk {
 		#clock-cells = <0>;
-		clock-frequency = <200000000>;
+		compatible = "fixed-factor-clock";
+		clocks = <&armpll>;
+		clock-div = <4>;
+		clock-mult = <1>;
 	};
 
-	axi81_clk: axi81_clk {
-		compatible = "fixed-clock";
+	genpll: genpll {
 		#clock-cells = <0>;
-		clock-frequency = <100000000>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
 	};
 
-	keypad_clk: keypad_clk {
-		compatible = "fixed-clock";
+	/* various clocks running off the GENPLL */
+	genpll_clks: genpll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-genpll-clk";
+		reg = <0x0301d000 0x2c>;
+		clocks = <&genpll>;
+		clock-output-names = "axi21", "250mhz", "ihost_sys",
+			"enet_sw", "audio_125", "can";
+	};
+
+	/* always 1/2 of the axi21 clock */
+	axi41_clk: axi41_clk {
 		#clock-cells = <0>;
-		clock-frequency = <31806>;
+		compatible = "fixed-factor-clock";
+		clocks = <&genpll_clks 0>;
+		clock-div = <2>;
+		clock-mult = <1>;
 	};
 
-	adc_clk: adc_clk {
-		compatible = "fixed-clock";
+	/* always 1/4 of the axi21 clock */
+	axi81_clk: axi81_clk {
 		#clock-cells = <0>;
-		clock-frequency = <1562500>;
+		compatible = "fixed-factor-clock";
+		clocks = <&genpll_clks 0>;
+		clock-div = <4>;
+		clock-mult = <1>;
 	};
 
-	pwm_clk: pwm_clk {
-		compatible = "fixed-clock";
+	lcpll0: lcpll0 {
 		#clock-cells = <0>;
-		clock-frequency = <1000000>;
+		compatible = "brcm,cygnus-lcpll0";
+		reg = <0x0301d02c 0x1c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
 	};
 
-	lcd_clk: mipipll_ch1 {
-		compatible = "fixed-clock";
+	/* various clocks running off the LCPLL0 */
+	lcpll0_clks: lcpll0_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-lcpll0-clk";
+		reg = <0x0301d02c 0x1c>;
+		clocks = <&lcpll0>;
+		clock-output-names = "pcie_phy", "ddr_phy", "sdio",
+			"usb_phy", "smart_card", "ch5";
+	};
+
+	mipipll: mipipll {
 		#clock-cells = <0>;
-		clock-frequency = <100000000>;
+		compatible = "brcm,cygnus-mipipll";
+		reg = <0x180a9800 0x2c>,
+			<0x0301c020 0x4>,
+			<0x180aa024 0x4>;
+		clock-frequency = <1350000000>;
+		clocks = <&osc>;
+	};
+
+	mipipll_clks: mipipll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-mipipll-clk";
+		reg = <0x180a9800 0x2c>;
+		clocks = <&mipipll>;
+		clock-output-names = "ch0_unused", "ch1_lcd", "ch2_unused",
+			"ch3_unused", "ch4_unused", "ch5_unused";
+	};
+
+	asiu_clks: asiu_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-asiu-clk";
+		reg = <0x0301d048 0xc>,
+			<0x180aa024 0x4>;
+		clocks = <&osc>;
+		clock-output-names = "keypad", "adc/touch", "pwm";
 	};
 };
diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..2b99e9c 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -134,7 +134,7 @@
 		compatible = "arm,cortex-a9-global-timer";
 		reg = <0x19020200 0x100>;
 		interrupts = <GIC_PPI 11 IRQ_TYPE_LEVEL_HIGH>;
-		clocks = <&periph_clk>;
+		clocks = <&arm_periph_clk>;
 	};
 
 };
-- 
1.7.9.5

[PATCH 4/4] ARM: dts: enable clock support for Broadcom Cygnus

[Ray Jui]

Replace current device tree dummy clocks with real clock support for
Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbraden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus-clock.dtsi |  110 ++++++++++++++++++++++++-------
 arch/arm/boot/dts/bcm-cygnus.dtsi       |    2 +-
 2 files changed, 86 insertions(+), 26 deletions(-)

diff --git a/arch/arm/boot/dts/bcm-cygnus-clock.dtsi b/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
index 60d8389..f2da5e2 100644
--- a/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
@@ -36,56 +36,116 @@ clocks {
 	ranges;
 
 	osc: oscillator {
+		#clock-cells = <0>;
 		compatible = "fixed-clock";
-		#clock-cells = <1>;
 		clock-frequency = <25000000>;
 	};
 
-	apb_clk: apb_clk {
-		compatible = "fixed-clock";
+	/* Cygnus ARM PLL */
+	armpll: armpll {
 		#clock-cells = <0>;
-		clock-frequency = <1000000000>;
+		compatible = "brcm,cygnus-armpll";
+		clocks = <&osc>;
+		reg = <0x19000000 0x1000>;
 	};
 
-	periph_clk: periph_clk {
-		compatible = "fixed-clock";
+	/* peripheral clock for system timer */
+	arm_periph_clk: arm_periph_clk {
 		#clock-cells = <0>;
-		clock-frequency = <500000000>;
+		compatible = "fixed-factor-clock";
+		clocks = <&armpll>;
+		clock-div = <2>;
+		clock-mult = <1>;
 	};
 
-	sdio_clk: lcpll_ch2 {
-		compatible = "fixed-clock";
+	/* APB bus clock */
+	apb_clk: apb_clk {
 		#clock-cells = <0>;
-		clock-frequency = <200000000>;
+		compatible = "fixed-factor-clock";
+		clocks = <&armpll>;
+		clock-div = <4>;
+		clock-mult = <1>;
 	};
 
-	axi81_clk: axi81_clk {
-		compatible = "fixed-clock";
+	genpll: genpll {
 		#clock-cells = <0>;
-		clock-frequency = <100000000>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
 	};
 
-	keypad_clk: keypad_clk {
-		compatible = "fixed-clock";
+	/* various clocks running off the GENPLL */
+	genpll_clks: genpll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-genpll-clk";
+		reg = <0x0301d000 0x2c>;
+		clocks = <&genpll>;
+		clock-output-names = "axi21", "250mhz", "ihost_sys",
+			"enet_sw", "audio_125", "can";
+	};
+
+	/* always 1/2 of the axi21 clock */
+	axi41_clk: axi41_clk {
 		#clock-cells = <0>;
-		clock-frequency = <31806>;
+		compatible = "fixed-factor-clock";
+		clocks = <&genpll_clks 0>;
+		clock-div = <2>;
+		clock-mult = <1>;
 	};
 
-	adc_clk: adc_clk {
-		compatible = "fixed-clock";
+	/* always 1/4 of the axi21 clock */
+	axi81_clk: axi81_clk {
 		#clock-cells = <0>;
-		clock-frequency = <1562500>;
+		compatible = "fixed-factor-clock";
+		clocks = <&genpll_clks 0>;
+		clock-div = <4>;
+		clock-mult = <1>;
 	};
 
-	pwm_clk: pwm_clk {
-		compatible = "fixed-clock";
+	lcpll0: lcpll0 {
 		#clock-cells = <0>;
-		clock-frequency = <1000000>;
+		compatible = "brcm,cygnus-lcpll0";
+		reg = <0x0301d02c 0x1c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
 	};
 
-	lcd_clk: mipipll_ch1 {
-		compatible = "fixed-clock";
+	/* various clocks running off the LCPLL0 */
+	lcpll0_clks: lcpll0_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-lcpll0-clk";
+		reg = <0x0301d02c 0x1c>;
+		clocks = <&lcpll0>;
+		clock-output-names = "pcie_phy", "ddr_phy", "sdio",
+			"usb_phy", "smart_card", "ch5";
+	};
+
+	mipipll: mipipll {
 		#clock-cells = <0>;
-		clock-frequency = <100000000>;
+		compatible = "brcm,cygnus-mipipll";
+		reg = <0x180a9800 0x2c>,
+			<0x0301c020 0x4>,
+			<0x180aa024 0x4>;
+		clock-frequency = <1350000000>;
+		clocks = <&osc>;
+	};
+
+	mipipll_clks: mipipll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-mipipll-clk";
+		reg = <0x180a9800 0x2c>;
+		clocks = <&mipipll>;
+		clock-output-names = "ch0_unused", "ch1_lcd", "ch2_unused",
+			"ch3_unused", "ch4_unused", "ch5_unused";
+	};
+
+	asiu_clks: asiu_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-asiu-clk";
+		reg = <0x0301d048 0xc>,
+			<0x180aa024 0x4>;
+		clocks = <&osc>;
+		clock-output-names = "keypad", "adc/touch", "pwm";
 	};
 };
diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..2b99e9c 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -134,7 +134,7 @@
 		compatible = "arm,cortex-a9-global-timer";
 		reg = <0x19020200 0x100>;
 		interrupts = <GIC_PPI 11 IRQ_TYPE_LEVEL_HIGH>;
-		clocks = <&periph_clk>;
+		clocks = <&arm_periph_clk>;
 	};
 
 };
-- 
1.7.9.5

[PATCH 0/4] Add pinctrl support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial pinctrl support for the Broadcom Cygnus SoC.
The Cygnus pinctrl controller supports group based alternate function configuration

Ray Jui (4):
  pinctrl: Broadcom Cygnus pinctrl device tree binding
  pinctrl: cygnus: add initial pinctrl support
  ARM: mach-bcm: enable pinctrl support for Cygnus
  ARM: dts: enable pinctrl for Broadcom Cygnus

 .../bindings/pinctrl/brcm,cygnus-pinctrl.txt       |   92 +++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |    5 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/pinctrl/Kconfig                            |    7 +
 drivers/pinctrl/Makefile                           |    1 +
 drivers/pinctrl/pinctrl-bcm-cygnus.c               |  753 ++++++++++++++++++++
 6 files changed, 859 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
 create mode 100644 drivers/pinctrl/pinctrl-bcm-cygnus.c

-- 
1.7.9.5

[PATCH 0/4] Add pinctrl support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial pinctrl support for the Broadcom Cygnus SoC.
The Cygnus pinctrl controller supports group based alternate function configuration

Ray Jui (4):
  pinctrl: Broadcom Cygnus pinctrl device tree binding
  pinctrl: cygnus: add initial pinctrl support
  ARM: mach-bcm: enable pinctrl support for Cygnus
  ARM: dts: enable pinctrl for Broadcom Cygnus

 .../bindings/pinctrl/brcm,cygnus-pinctrl.txt       |   92 +++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |    5 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/pinctrl/Kconfig                            |    7 +
 drivers/pinctrl/Makefile                           |    1 +
 drivers/pinctrl/pinctrl-bcm-cygnus.c               |  753 ++++++++++++++++++++
 6 files changed, 859 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
 create mode 100644 drivers/pinctrl/pinctrl-bcm-cygnus.c

-- 
1.7.9.5

[PATCH 0/4] Add pinctrl support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial pinctrl support for the Broadcom Cygnus SoC.
The Cygnus pinctrl controller supports group based alternate function configuration

Ray Jui (4):
  pinctrl: Broadcom Cygnus pinctrl device tree binding
  pinctrl: cygnus: add initial pinctrl support
  ARM: mach-bcm: enable pinctrl support for Cygnus
  ARM: dts: enable pinctrl for Broadcom Cygnus

 .../bindings/pinctrl/brcm,cygnus-pinctrl.txt       |   92 +++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |    5 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/pinctrl/Kconfig                            |    7 +
 drivers/pinctrl/Makefile                           |    1 +
 drivers/pinctrl/pinctrl-bcm-cygnus.c               |  753 ++++++++++++++++++++
 6 files changed, 859 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
 create mode 100644 drivers/pinctrl/pinctrl-bcm-cygnus.c

-- 
1.7.9.5

[PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Ray Jui]

Device tree binding documentation for Broadcom Cygnus pinctrl driver

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../bindings/pinctrl/brcm,cygnus-pinctrl.txt       |   92 ++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt

diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
new file mode 100644
index 0000000..86e4579
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
@@ -0,0 +1,92 @@
+Broadcom Cygnus Pin Controller
+
+The Cygnus pin controller supports setting the alternate functions of groups
+of pins. Pinmux configuration on individual pins is not supported by the
+Cygnus A0 SoC.
+
+Required properties:
+
+- compatible:
+    Must be "brcm,cygnus-pinctrl"
+
+- reg:
+    Define the base and range of the I/O address space that contain the Cygnus
+pin control registers
+
+- brcm,groups:
+    This can be strings of one or more group names. This defines the group(s)
+that one wants to configure
+
+- brcm,function:
+    This is the alternate function that one wants to configure to. Valid
+alternate functions are "alt1", "alt2", "alt3", "alt4"
+
+Each child node represents a configuration. Client devices reference the the
+child node to enable the mux configuration.
+
+For example:
+
+	pinctrl: pinctrl@0x0301d0c8 {
+		compatible = "brcm,cygnus-pinctrl";
+		reg = <0x0301d0c8 0x2c>;
+
+		i2s_0: i2s_0 {
+			brcm,groups = "smart_card0", "smart_card0_fcb";
+			brcm,function = "alt2";
+		};
+
+		i2s_1: i2s_1 {
+			brcm,groups = "smart_card1", "smart_card1_fcb";
+			brcm,function = "alt2";
+		};
+
+		spi_0: spi_0 {
+			brcm,groups = "spi0";
+			brcm,function = "alt1";
+		};
+	}
+
+	spi0@18028000 {
+			compatible = "arm,pl022", "arm,primecell";
+			reg = <0x18028000 0x1000>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			interrupts = <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>;
+			pinctrl-0 = <&spi_0>;
+			clocks = <&axi81_clk>;
+			clock-names = "apb_pclk";
+	};
+
+Consider the following snapshot of Cygnus pinmux table:
+
+number    pin            group              alt1             alt2        alt3        alt4
+------    ---            ----               ----             ----        ----        ----
+42        sc0_clk        smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio24
+43        sc0_cmdvcc_l   smart_card0        SMART CARD0      I2S_0       N/A         STRAP
+44        sc0_detect     smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio25
+45        sc0_fcb        smart_card0_fcb    SMART CARD0_FCB  I2S_0       N/A         chip_gpio26
+46        sc0_io         smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio27
+47        sc0_rst_l      smart_card0        SMART CARD0      SPDIF       N/A         STRAP
+
+Note due to limitation of the Cygnus hardware, pinmux configuration can only
+be group based. To enable I2S_0 function, one needs the following child node
+configuration:
+
+	i2s_0: i2s_0 {
+		brcm,groups = "smart_card0", "smart_card0_fcb";
+		brcm,function = "alt2";
+	};
+
+This tells the Cygnus pin controller to configure groups "smart_card0" and
+"smart_card0_fcb" to I2S_0. With this configuration, pins 42, 43, 44, 45, 46
+become I2C_0, and pin 47 becomes SPDIF
+
+Consider another example, that one wants to configure the above pins as GPIO:
+
+	gpio_24_27: gpio_24_27 {
+		brcm,groups = "smart_card0", "smart_card0_fcb";
+		brcm,function = "alt4";
+	};
+
+With the above configuration, pins 42, 44, 45, 46 become GPIO, and 43 and 47
+become reserved for STRAP
-- 
1.7.9.5

[PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Ray Jui]

Device tree binding documentation for Broadcom Cygnus pinctrl driver

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../bindings/pinctrl/brcm,cygnus-pinctrl.txt       |   92 ++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt

diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
new file mode 100644
index 0000000..86e4579
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
@@ -0,0 +1,92 @@
+Broadcom Cygnus Pin Controller
+
+The Cygnus pin controller supports setting the alternate functions of groups
+of pins. Pinmux configuration on individual pins is not supported by the
+Cygnus A0 SoC.
+
+Required properties:
+
+- compatible:
+    Must be "brcm,cygnus-pinctrl"
+
+- reg:
+    Define the base and range of the I/O address space that contain the Cygnus
+pin control registers
+
+- brcm,groups:
+    This can be strings of one or more group names. This defines the group(s)
+that one wants to configure
+
+- brcm,function:
+    This is the alternate function that one wants to configure to. Valid
+alternate functions are "alt1", "alt2", "alt3", "alt4"
+
+Each child node represents a configuration. Client devices reference the the
+child node to enable the mux configuration.
+
+For example:
+
+	pinctrl: pinctrl@0x0301d0c8 {
+		compatible = "brcm,cygnus-pinctrl";
+		reg = <0x0301d0c8 0x2c>;
+
+		i2s_0: i2s_0 {
+			brcm,groups = "smart_card0", "smart_card0_fcb";
+			brcm,function = "alt2";
+		};
+
+		i2s_1: i2s_1 {
+			brcm,groups = "smart_card1", "smart_card1_fcb";
+			brcm,function = "alt2";
+		};
+
+		spi_0: spi_0 {
+			brcm,groups = "spi0";
+			brcm,function = "alt1";
+		};
+	}
+
+	spi0@18028000 {
+			compatible = "arm,pl022", "arm,primecell";
+			reg = <0x18028000 0x1000>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			interrupts = <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>;
+			pinctrl-0 = <&spi_0>;
+			clocks = <&axi81_clk>;
+			clock-names = "apb_pclk";
+	};
+
+Consider the following snapshot of Cygnus pinmux table:
+
+number    pin            group              alt1             alt2        alt3        alt4
+------    ---            ----               ----             ----        ----        ----
+42        sc0_clk        smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio24
+43        sc0_cmdvcc_l   smart_card0        SMART CARD0      I2S_0       N/A         STRAP
+44        sc0_detect     smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio25
+45        sc0_fcb        smart_card0_fcb    SMART CARD0_FCB  I2S_0       N/A         chip_gpio26
+46        sc0_io         smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio27
+47        sc0_rst_l      smart_card0        SMART CARD0      SPDIF       N/A         STRAP
+
+Note due to limitation of the Cygnus hardware, pinmux configuration can only
+be group based. To enable I2S_0 function, one needs the following child node
+configuration:
+
+	i2s_0: i2s_0 {
+		brcm,groups = "smart_card0", "smart_card0_fcb";
+		brcm,function = "alt2";
+	};
+
+This tells the Cygnus pin controller to configure groups "smart_card0" and
+"smart_card0_fcb" to I2S_0. With this configuration, pins 42, 43, 44, 45, 46
+become I2C_0, and pin 47 becomes SPDIF
+
+Consider another example, that one wants to configure the above pins as GPIO:
+
+	gpio_24_27: gpio_24_27 {
+		brcm,groups = "smart_card0", "smart_card0_fcb";
+		brcm,function = "alt4";
+	};
+
+With the above configuration, pins 42, 44, 45, 46 become GPIO, and 43 and 47
+become reserved for STRAP
-- 
1.7.9.5

[PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Ray Jui]

Device tree binding documentation for Broadcom Cygnus pinctrl driver

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../bindings/pinctrl/brcm,cygnus-pinctrl.txt       |   92 ++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt

diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
new file mode 100644
index 0000000..86e4579
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
@@ -0,0 +1,92 @@
+Broadcom Cygnus Pin Controller
+
+The Cygnus pin controller supports setting the alternate functions of groups
+of pins. Pinmux configuration on individual pins is not supported by the
+Cygnus A0 SoC.
+
+Required properties:
+
+- compatible:
+    Must be "brcm,cygnus-pinctrl"
+
+- reg:
+    Define the base and range of the I/O address space that contain the Cygnus
+pin control registers
+
+- brcm,groups:
+    This can be strings of one or more group names. This defines the group(s)
+that one wants to configure
+
+- brcm,function:
+    This is the alternate function that one wants to configure to. Valid
+alternate functions are "alt1", "alt2", "alt3", "alt4"
+
+Each child node represents a configuration. Client devices reference the the
+child node to enable the mux configuration.
+
+For example:
+
+	pinctrl: pinctrl at 0x0301d0c8 {
+		compatible = "brcm,cygnus-pinctrl";
+		reg = <0x0301d0c8 0x2c>;
+
+		i2s_0: i2s_0 {
+			brcm,groups = "smart_card0", "smart_card0_fcb";
+			brcm,function = "alt2";
+		};
+
+		i2s_1: i2s_1 {
+			brcm,groups = "smart_card1", "smart_card1_fcb";
+			brcm,function = "alt2";
+		};
+
+		spi_0: spi_0 {
+			brcm,groups = "spi0";
+			brcm,function = "alt1";
+		};
+	}
+
+	spi0 at 18028000 {
+			compatible = "arm,pl022", "arm,primecell";
+			reg = <0x18028000 0x1000>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			interrupts = <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>;
+			pinctrl-0 = <&spi_0>;
+			clocks = <&axi81_clk>;
+			clock-names = "apb_pclk";
+	};
+
+Consider the following snapshot of Cygnus pinmux table:
+
+number    pin            group              alt1             alt2        alt3        alt4
+------    ---            ----               ----             ----        ----        ----
+42        sc0_clk        smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio24
+43        sc0_cmdvcc_l   smart_card0        SMART CARD0      I2S_0       N/A         STRAP
+44        sc0_detect     smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio25
+45        sc0_fcb        smart_card0_fcb    SMART CARD0_FCB  I2S_0       N/A         chip_gpio26
+46        sc0_io         smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio27
+47        sc0_rst_l      smart_card0        SMART CARD0      SPDIF       N/A         STRAP
+
+Note due to limitation of the Cygnus hardware, pinmux configuration can only
+be group based. To enable I2S_0 function, one needs the following child node
+configuration:
+
+	i2s_0: i2s_0 {
+		brcm,groups = "smart_card0", "smart_card0_fcb";
+		brcm,function = "alt2";
+	};
+
+This tells the Cygnus pin controller to configure groups "smart_card0" and
+"smart_card0_fcb" to I2S_0. With this configuration, pins 42, 43, 44, 45, 46
+become I2C_0, and pin 47 becomes SPDIF
+
+Consider another example, that one wants to configure the above pins as GPIO:
+
+	gpio_24_27: gpio_24_27 {
+		brcm,groups = "smart_card0", "smart_card0_fcb";
+		brcm,function = "alt4";
+	};
+
+With the above configuration, pins 42, 44, 45, 46 become GPIO, and 43 and 47
+become reserved for STRAP
-- 
1.7.9.5

[PATCH 2/4] pinctrl: cygnus: add initial pinctrl support

[Ray Jui]

This adds the initial driver support for the Broadcom Cygnus pinctrl
controller. The Cygnus pinctrl controller supports group based
alternate function configuration

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
---
 drivers/pinctrl/Kconfig              |    7 +
 drivers/pinctrl/Makefile             |    1 +
 drivers/pinctrl/pinctrl-bcm-cygnus.c |  753 ++++++++++++++++++++++++++++++++++
 3 files changed, 761 insertions(+)
 create mode 100644 drivers/pinctrl/pinctrl-bcm-cygnus.c

diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index d014f22..4549e9f 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -85,6 +85,13 @@ config PINCTRL_BCM281XX
 	  BCM28145, and BCM28155 SoCs.  This driver requires the pinctrl
 	  framework.  GPIO is provided by a separate GPIO driver.
 
+config PINCTRL_BCM_CYGNUS
+	bool "Broadcom Cygnus pinctrl driver"
+	depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
+	select PINMUX
+	select PINCONF
+	select GENERIC_PINCONF
+
 config PINCTRL_LANTIQ
 	bool
 	depends on LANTIQ
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index c030b3d..4ed8e8a 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_PINCTRL_BF60x)	+= pinctrl-adi2-bf60x.o
 obj-$(CONFIG_PINCTRL_AT91)	+= pinctrl-at91.o
 obj-$(CONFIG_PINCTRL_BCM2835)	+= pinctrl-bcm2835.o
 obj-$(CONFIG_PINCTRL_BCM281XX)	+= pinctrl-bcm281xx.o
+obj-$(CONFIG_PINCTRL_BCM_CYGNUS)	+= pinctrl-bcm-cygnus.o
 obj-$(CONFIG_PINCTRL_FALCON)	+= pinctrl-falcon.o
 obj-$(CONFIG_PINCTRL_PALMAS)	+= pinctrl-palmas.o
 obj-$(CONFIG_PINCTRL_ROCKCHIP)	+= pinctrl-rockchip.o
diff --git a/drivers/pinctrl/pinctrl-bcm-cygnus.c b/drivers/pinctrl/pinctrl-bcm-cygnus.c
new file mode 100644
index 0000000..eb6e27a
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-bcm-cygnus.c
@@ -0,0 +1,753 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/slab.h>
+
+#include "core.h"
+#include "pinctrl-utils.h"
+
+/*
+ * Alternate function configuration
+ *
+ * @name: name of the alternate function
+ * @group_names: array of strings of group names that can be supported by this
+ * alternate function
+ * @num_groups: total number of groups that can be supported by this alternate
+ * function
+ * @mux: mux setting for this alternate function to be programed
+ */
+struct cygnus_pin_function {
+	const char *name;
+	const char * const *group_names;
+	const unsigned num_groups;
+	unsigned int mux;
+};
+
+/*
+ * Cygnus allows group based pinmux configuration
+ *
+ * @name: name of the group
+ * @pins: array of pins used by this group
+ * @num_pins: total number of pins used by this group
+ * @offset: register offset for pinmux configuration of this group
+ * @shift: bit shift for pinmux configuration of this group
+ */
+struct cygnus_pin_group {
+	const char *name;
+	const unsigned *pins;
+	const unsigned num_pins;
+	const unsigned int offset;
+	const unsigned int shift;
+};
+
+/*
+ * Cygnus pinctrl core
+ *
+ * @pctl: pointer to pinctrl_dev
+ * @dev: pointer to the device
+ * @base: I/O register base for Cygnus pinctrl configuration
+ *
+ */
+struct cygnus_pinctrl {
+	struct pinctrl_dev *pctl;
+	struct device *dev;
+	void __iomem *base;
+
+	const struct pinctrl_pin_desc *pins;
+	unsigned num_pins;
+
+	const struct cygnus_pin_group *groups;
+	unsigned num_groups;
+
+	const struct cygnus_pin_function *functions;
+	unsigned num_functions;
+};
+
+#define CYGNUS_PIN_GROUP(group_name, off, sh)		\
+{							\
+	.name = #group_name,				\
+	.pins = group_name##_pins,			\
+	.num_pins = ARRAY_SIZE(group_name##_pins),	\
+	.offset = off,					\
+	.shift = sh,					\
+}
+
+/*
+ * The following pin description is based on Cygnus I/O MUX spreadsheet
+ */
+static const struct pinctrl_pin_desc cygnus_pinctrl_pins[] = {
+	PINCTRL_PIN(0, "ext_device_reset_n"),
+	PINCTRL_PIN(1, "chip_mode0"),
+	PINCTRL_PIN(2, "chip_mode1"),
+	PINCTRL_PIN(3, "chip_mode2"),
+	PINCTRL_PIN(4, "chip_mode3"),
+	PINCTRL_PIN(5, "chip_mode4"),
+	PINCTRL_PIN(6, "bsc0_scl"),
+	PINCTRL_PIN(7, "bsc0_sda"),
+	PINCTRL_PIN(8, "bsc1_scl"),
+	PINCTRL_PIN(9, "bsc1_sda"),
+	PINCTRL_PIN(10, "d1w_dq"),
+	PINCTRL_PIN(11, "d1wowstz_l"),
+	PINCTRL_PIN(12, "gpio0"),
+	PINCTRL_PIN(13, "gpio1"),
+	PINCTRL_PIN(14, "gpio2"),
+	PINCTRL_PIN(15, "gpio3"),
+	PINCTRL_PIN(16, "gpio4"),
+	PINCTRL_PIN(17, "gpio5"),
+	PINCTRL_PIN(18, "gpio6"),
+	PINCTRL_PIN(19, "gpio7"),
+	PINCTRL_PIN(20, "gpio8"),
+	PINCTRL_PIN(21, "gpio9"),
+	PINCTRL_PIN(22, "gpio10"),
+	PINCTRL_PIN(23, "gpio11"),
+	PINCTRL_PIN(24, "gpio12"),
+	PINCTRL_PIN(25, "gpio13"),
+	PINCTRL_PIN(26, "gpio14"),
+	PINCTRL_PIN(27, "gpio15"),
+	PINCTRL_PIN(28, "gpio16"),
+	PINCTRL_PIN(29, "gpio17"),
+	PINCTRL_PIN(30, "gpio18"),
+	PINCTRL_PIN(31, "gpio19"),
+	PINCTRL_PIN(32, "gpio20"),
+	PINCTRL_PIN(33, "gpio21"),
+	PINCTRL_PIN(34, "gpio22"),
+	PINCTRL_PIN(35, "gpio23"),
+	PINCTRL_PIN(36, "mdc"),
+	PINCTRL_PIN(37, "mdio"),
+	PINCTRL_PIN(38, "pwm0"),
+	PINCTRL_PIN(39, "pwm1"),
+	PINCTRL_PIN(40, "pwm2"),
+	PINCTRL_PIN(41, "pwm3"),
+	PINCTRL_PIN(42, "sc0_clk"),
+	PINCTRL_PIN(43, "sc0_cmdvcc_l"),
+	PINCTRL_PIN(44, "sc0_detect"),
+	PINCTRL_PIN(45, "sc0_fcb"),
+	PINCTRL_PIN(46, "sc0_io"),
+	PINCTRL_PIN(47, "sc0_rst_l"),
+	PINCTRL_PIN(48, "sc1_clk"),
+	PINCTRL_PIN(49, "sc1_cmdvcc_l"),
+	PINCTRL_PIN(50, "sc1_detect"),
+	PINCTRL_PIN(51, "sc1_fcb"),
+	PINCTRL_PIN(52, "sc1_io"),
+	PINCTRL_PIN(53, "sc1_rst_l"),
+	PINCTRL_PIN(54, "spi0_clk"),
+	PINCTRL_PIN(55, "spi0_mosi"),
+	PINCTRL_PIN(56, "spi0_miso"),
+	PINCTRL_PIN(57, "spi0_ss"),
+	PINCTRL_PIN(58, "spi1_clk"),
+	PINCTRL_PIN(59, "spi1_mosi"),
+	PINCTRL_PIN(60, "spi1_miso"),
+	PINCTRL_PIN(61, "spi1_ss"),
+	PINCTRL_PIN(62, "spi2_clk"),
+	PINCTRL_PIN(63, "spi2_mosi"),
+	PINCTRL_PIN(64, "spi2_miso"),
+	PINCTRL_PIN(65, "spi2_ss"),
+	PINCTRL_PIN(66, "spi3_clk"),
+	PINCTRL_PIN(67, "spi3_mosi"),
+	PINCTRL_PIN(68, "spi3_miso"),
+	PINCTRL_PIN(69, "spi3_ss"),
+	PINCTRL_PIN(70, "uart0_cts"),
+	PINCTRL_PIN(71, "uart0_rts"),
+	PINCTRL_PIN(72, "uart0_rx"),
+	PINCTRL_PIN(73, "uart0_tx"),
+	PINCTRL_PIN(74, "uart1_cts"),
+	PINCTRL_PIN(75, "uart1_dcd"),
+	PINCTRL_PIN(76, "uart1_dsr"),
+	PINCTRL_PIN(77, "uart1_dtr"),
+	PINCTRL_PIN(78, "uart1_ri"),
+	PINCTRL_PIN(79, "uart1_rts"),
+	PINCTRL_PIN(80, "uart1_rx"),
+	PINCTRL_PIN(81, "uart1_tx"),
+	PINCTRL_PIN(82, "uart3_rx"),
+	PINCTRL_PIN(83, "uart3_tx"),
+	PINCTRL_PIN(84, "sdio1_clk_sdcard"),
+	PINCTRL_PIN(85, "sdio1_cmd"),
+	PINCTRL_PIN(86, "sdio1_data0"),
+	PINCTRL_PIN(87, "sdio1_data1"),
+	PINCTRL_PIN(88, "sdio1_data2"),
+	PINCTRL_PIN(89, "sdio1_data3"),
+	PINCTRL_PIN(90, "sdio1_wp_n"),
+	PINCTRL_PIN(91, "sdio1_card_rst"),
+	PINCTRL_PIN(92, "sdio1_led_on"),
+	PINCTRL_PIN(93, "sdio1_cd"),
+	PINCTRL_PIN(94, "sdio0_clk_sdcard"),
+	PINCTRL_PIN(95, "sdio0_cmd"),
+	PINCTRL_PIN(96, "sdio0_data0"),
+	PINCTRL_PIN(97, "sdio0_data1"),
+	PINCTRL_PIN(98, "sdio0_data2"),
+	PINCTRL_PIN(99, "sdio0_data3"),
+	PINCTRL_PIN(100, "sdio0_wp_n"),
+	PINCTRL_PIN(101, "sdio0_card_rst"),
+	PINCTRL_PIN(102, "sdio0_led_on"),
+	PINCTRL_PIN(103, "sdio0_cd"),
+	PINCTRL_PIN(104, "sflash_clk"),
+	PINCTRL_PIN(105, "sflash_cs_l"),
+	PINCTRL_PIN(106, "sflash_mosi"),
+	PINCTRL_PIN(107, "sflash_miso"),
+	PINCTRL_PIN(108, "sflash_wp_n"),
+	PINCTRL_PIN(109, "sflash_hold_n"),
+	PINCTRL_PIN(110, "nand_ale"),
+	PINCTRL_PIN(111, "nand_ce0_l"),
+	PINCTRL_PIN(112, "nand_ce1_l"),
+	PINCTRL_PIN(113, "nand_cle"),
+	PINCTRL_PIN(114, "nand_dq0"),
+	PINCTRL_PIN(115, "nand_dq1"),
+	PINCTRL_PIN(116, "nand_dq2"),
+	PINCTRL_PIN(117, "nand_dq3"),
+	PINCTRL_PIN(118, "nand_dq4"),
+	PINCTRL_PIN(119, "nand_dq5"),
+	PINCTRL_PIN(120, "nand_dq6"),
+	PINCTRL_PIN(121, "nand_dq7"),
+	PINCTRL_PIN(122, "nand_rb_l"),
+	PINCTRL_PIN(123, "nand_re_l"),
+	PINCTRL_PIN(124, "nand_we_l"),
+	PINCTRL_PIN(125, "nand_wp_l"),
+	PINCTRL_PIN(126, "lcd_clac"),
+	PINCTRL_PIN(127, "lcd_clcp"),
+	PINCTRL_PIN(128, "lcd_cld0"),
+	PINCTRL_PIN(129, "lcd_cld1"),
+	PINCTRL_PIN(130, "lcd_cld10"),
+	PINCTRL_PIN(131, "lcd_cld11"),
+	PINCTRL_PIN(132, "lcd_cld12"),
+	PINCTRL_PIN(133, "lcd_cld13"),
+	PINCTRL_PIN(134, "lcd_cld14"),
+	PINCTRL_PIN(135, "lcd_cld15"),
+	PINCTRL_PIN(136, "lcd_cld16"),
+	PINCTRL_PIN(137, "lcd_cld17"),
+	PINCTRL_PIN(138, "lcd_cld18"),
+	PINCTRL_PIN(139, "lcd_cld19"),
+	PINCTRL_PIN(140, "lcd_cld2"),
+	PINCTRL_PIN(141, "lcd_cld20"),
+	PINCTRL_PIN(142, "lcd_cld21"),
+	PINCTRL_PIN(143, "lcd_cld22"),
+	PINCTRL_PIN(144, "lcd_cld23"),
+	PINCTRL_PIN(145, "lcd_cld3"),
+	PINCTRL_PIN(146, "lcd_cld4"),
+	PINCTRL_PIN(147, "lcd_cld5"),
+	PINCTRL_PIN(148, "lcd_cld6"),
+	PINCTRL_PIN(149, "lcd_cld7"),
+	PINCTRL_PIN(150, "lcd_cld8"),
+	PINCTRL_PIN(151, "lcd_cld9"),
+	PINCTRL_PIN(152, "lcd_clfp"),
+	PINCTRL_PIN(153, "lcd_clle"),
+	PINCTRL_PIN(154, "lcd_cllp"),
+	PINCTRL_PIN(155, "lcd_clpower"),
+	PINCTRL_PIN(156, "camera_vsync"),
+	PINCTRL_PIN(157, "camera_trigger"),
+	PINCTRL_PIN(158, "camera_strobe"),
+	PINCTRL_PIN(159, "camera_standby"),
+	PINCTRL_PIN(160, "camera_reset_n"),
+	PINCTRL_PIN(161, "camera_pixdata9"),
+	PINCTRL_PIN(162, "camera_pixdata8"),
+	PINCTRL_PIN(163, "camera_pixdata7"),
+	PINCTRL_PIN(164, "camera_pixdata6"),
+	PINCTRL_PIN(165, "camera_pixdata5"),
+	PINCTRL_PIN(166, "camera_pixdata4"),
+	PINCTRL_PIN(167, "camera_pixdata3"),
+	PINCTRL_PIN(168, "camera_pixdata2"),
+	PINCTRL_PIN(169, "camera_pixdata1"),
+	PINCTRL_PIN(170, "camera_pixdata0"),
+	PINCTRL_PIN(171, "camera_pixclk"),
+	PINCTRL_PIN(172, "camera_hsync"),
+	PINCTRL_PIN(173, "camera_pll_ref_clk"),
+	PINCTRL_PIN(174, "usb_id_indication"),
+	PINCTRL_PIN(175, "usb_vbus_indication"),
+	PINCTRL_PIN(176, "gpio0_3p3"),
+	PINCTRL_PIN(177, "gpio1_3p3"),
+	PINCTRL_PIN(178, "gpio2_3p3"),
+	PINCTRL_PIN(179, "gpio3_3p3"),
+};
+
+/*
+ * List of groups of pins
+ */
+static const unsigned gpio0_pins[] = { 12 };
+static const unsigned gpio1_pins[] = { 13 };
+static const unsigned gpio2_pins[] = { 14 };
+static const unsigned gpio3_pins[] = { 15 };
+static const unsigned gpio4_pins[] = { 16 };
+static const unsigned gpio5_pins[] = { 17 };
+static const unsigned gpio6_pins[] = { 18 };
+static const unsigned gpio7_pins[] = { 19 };
+static const unsigned gpio8_pins[] = { 20 };
+static const unsigned gpio9_pins[] = { 21 };
+static const unsigned gpio10_pins[] = { 22 };
+static const unsigned gpio11_pins[] = { 23 };
+static const unsigned gpio12_pins[] = { 24 };
+static const unsigned gpio13_pins[] = { 25 };
+static const unsigned gpio14_pins[] = { 26 };
+static const unsigned gpio15_pins[] = { 27 };
+static const unsigned gpio16_pins[] = { 28 };
+static const unsigned gpio17_pins[] = { 29 };
+static const unsigned gpio18_pins[] = { 30 };
+static const unsigned gpio19_pins[] = { 31 };
+static const unsigned gpio20_pins[] = { 32 };
+static const unsigned gpio21_pins[] = { 33 };
+static const unsigned gpio22_pins[] = { 34 };
+static const unsigned gpio23_pins[] = { 35 };
+static const unsigned pwm0_pins[] = { 38 };
+static const unsigned pwm1_pins[] = { 39 };
+static const unsigned pwm2_pins[] = { 40 };
+static const unsigned pwm3_pins[] = { 41 };
+static const unsigned sdio0_pins[] = { 94, 95, 96, 97, 98, 99 };
+static const unsigned smart_card0_pins[] = { 42, 43, 44, 46, 47 };
+static const unsigned smart_card1_pins[] = { 48, 49, 50, 52, 53 };
+static const unsigned spi0_pins[] = { 54, 55, 56, 57 };
+static const unsigned spi1_pins[] = { 58, 59, 60, 61 };
+static const unsigned spi2_pins[] = { 62, 63, 64, 65 };
+static const unsigned spi3_pins[] = { 66, 67, 68, 69 };
+static const unsigned d1w_pins[] = { 10, 11 };
+static const unsigned lcd_pins[] = { 126, 127, 128, 129, 130, 131, 132,	133,
+	134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147,
+	148, 149, 150, 151, 152, 153, 154, 155 };
+static const unsigned uart0_pins[] = { 70, 71, 72, 73 };
+static const unsigned uart1_dte_pins[] = { 75, 76, 77, 78 };
+static const unsigned uart1_pins[] = { 74, 79, 80, 81 };
+static const unsigned uart3_pins[] = { 82, 83 };
+static const unsigned qspi_pins[] = { 104, 105, 106, 107 };
+static const unsigned nand_pins[] = { 110, 111, 112, 113, 114, 115, 116, 117,
+	118, 119, 120, 121, 122, 123, 124, 125 };
+static const unsigned sdio0_cd_pins[] = { 103 };
+static const unsigned sdio0_mmc_pins[] = { 100, 101, 102 };
+static const unsigned can0_spi4_pins[] = { 86, 87 };
+static const unsigned can1_spi4_pins[] = { 88, 89 };
+static const unsigned sdio1_cd_pins[] = { 93 };
+static const unsigned sdio1_led_pins[] = { 84, 85 };
+static const unsigned sdio1_mmc_pins[] = { 90, 91, 92 };
+static const unsigned camera_led_pins[] = { 156, 157, 158, 159, 160 };
+static const unsigned camera_rgmii_pins[] = { 169, 170, 171, 169, 170, 171,
+	172, 173 };
+static const unsigned camera_sram_rgmii_pins[] = { 161, 162, 163, 164, 165,
+	166, 167, 168 };
+static const unsigned qspi_gpio_pins[] = { 108, 109 };
+static const unsigned smart_card0_fcb_pins[] = { 45 };
+static const unsigned smart_card1_fcb_pins[] = { 51 };
+static const unsigned gpio0_3p3_pins[] = { 176 };
+static const unsigned gpio1_3p3_pins[] = { 177 };
+static const unsigned gpio2_3p3_pins[] = { 178 };
+
+/*
+ * List of groups names. Need to match the order in cygnus_pin_groups
+ */
+static const char * const cygnus_pin_group_names[] = {
+	"gpio0",
+	"gpio1",
+	"gpio2",
+	"gpio3",
+	"gpio4",
+	"gpio5",
+	"gpio6",
+	"gpio7",
+	"gpio8",
+	"gpio9",
+	"gpio10",
+	"gpio11",
+	"gpio12",
+	"gpio13",
+	"gpio14",
+	"gpio15",
+	"gpio16",
+	"gpio17",
+	"gpio18",
+	"gpio19",
+	"gpio20",
+	"gpio21",
+	"gpio22",
+	"gpio23",
+	"pwm0",
+	"pwm1",
+	"pwm2",
+	"pwm3",
+	"sdio0",
+	"smart_card0",
+	"smart_card1",
+	"spi0",
+	"spi1",
+	"spi2",
+	"spi3",
+	"d1w",
+	"lcd",
+	"uart0",
+	"uart1_dte",
+	"uart1",
+	"uart3",
+	"qspi",
+	"nand",
+	"sdio0_cd",
+	"sdio0_mmc",
+	"can0_spi4",
+	"can1_spi4",
+	"sdio1_cd",
+	"sdio1_led",
+	"sdio1_mmc",
+	"camera_led",
+	"camera_rgmii",
+	"camera_sram_rgmii",
+	"qspi_gpio",
+	"smart_card0_fcb",
+	"smart_card1_fcb",
+	"gpio0_3p3",
+	"gpio1_3p3",
+	"gpio2_3p3",
+};
+
+/*
+ * List of groups. Need to match the order in cygnus_pin_group_names
+ */
+static const struct cygnus_pin_group cygnus_pin_groups[] = {
+	CYGNUS_PIN_GROUP(gpio0, 0x0, 0),
+	CYGNUS_PIN_GROUP(gpio1, 0x0, 4),
+	CYGNUS_PIN_GROUP(gpio2, 0x0, 8),
+	CYGNUS_PIN_GROUP(gpio3, 0x0, 12),
+	CYGNUS_PIN_GROUP(gpio4, 0x0, 16),
+	CYGNUS_PIN_GROUP(gpio5, 0x0, 20),
+	CYGNUS_PIN_GROUP(gpio6, 0x0, 24),
+	CYGNUS_PIN_GROUP(gpio7, 0x0, 28),
+	CYGNUS_PIN_GROUP(gpio8, 0x4, 0),
+	CYGNUS_PIN_GROUP(gpio9, 0x4, 4),
+	CYGNUS_PIN_GROUP(gpio10, 0x4, 8),
+	CYGNUS_PIN_GROUP(gpio11, 0x4, 12),
+	CYGNUS_PIN_GROUP(gpio12, 0x4, 16),
+	CYGNUS_PIN_GROUP(gpio13, 0x4, 20),
+	CYGNUS_PIN_GROUP(gpio14, 0x4, 24),
+	CYGNUS_PIN_GROUP(gpio15, 0x4, 28),
+	CYGNUS_PIN_GROUP(gpio16, 0x8, 0),
+	CYGNUS_PIN_GROUP(gpio17, 0x8, 4),
+	CYGNUS_PIN_GROUP(gpio18, 0x8, 8),
+	CYGNUS_PIN_GROUP(gpio19, 0x8, 12),
+	CYGNUS_PIN_GROUP(gpio20, 0x8, 16),
+	CYGNUS_PIN_GROUP(gpio21, 0x8, 20),
+	CYGNUS_PIN_GROUP(gpio22, 0x8, 24),
+	CYGNUS_PIN_GROUP(gpio23, 0x8, 28),
+	CYGNUS_PIN_GROUP(pwm0, 0xc, 0),
+	CYGNUS_PIN_GROUP(pwm1, 0xc, 4),
+	CYGNUS_PIN_GROUP(pwm2, 0xc, 8),
+	CYGNUS_PIN_GROUP(pwm3, 0xc, 12),
+	CYGNUS_PIN_GROUP(sdio0, 0xc, 16),
+	CYGNUS_PIN_GROUP(smart_card0, 0xc, 20),
+	CYGNUS_PIN_GROUP(smart_card1, 0xc, 24),
+	CYGNUS_PIN_GROUP(spi0, 0x10, 0),
+	CYGNUS_PIN_GROUP(spi1, 0x10, 4),
+	CYGNUS_PIN_GROUP(spi2, 0x10, 8),
+	CYGNUS_PIN_GROUP(spi3, 0x10, 12),
+	CYGNUS_PIN_GROUP(d1w, 0x10, 16),
+	CYGNUS_PIN_GROUP(lcd, 0x10, 20),
+	CYGNUS_PIN_GROUP(uart0, 0x14, 0),
+	CYGNUS_PIN_GROUP(uart1_dte, 0x14, 4),
+	CYGNUS_PIN_GROUP(uart1, 0x14, 8),
+	CYGNUS_PIN_GROUP(uart3, 0x14, 12),
+	CYGNUS_PIN_GROUP(qspi, 0x14, 16),
+	CYGNUS_PIN_GROUP(nand, 0x14, 20),
+	CYGNUS_PIN_GROUP(sdio0_cd, 0x18, 0),
+	CYGNUS_PIN_GROUP(sdio0_mmc, 0x18, 4),
+	CYGNUS_PIN_GROUP(can0_spi4, 0x18, 8),
+	CYGNUS_PIN_GROUP(can1_spi4, 0x18, 12),
+	CYGNUS_PIN_GROUP(sdio1_cd, 0x18, 16),
+	CYGNUS_PIN_GROUP(sdio1_led, 0x18, 20),
+	CYGNUS_PIN_GROUP(sdio1_mmc, 0x18, 24),
+	CYGNUS_PIN_GROUP(camera_led, 0x1c, 0),
+	CYGNUS_PIN_GROUP(camera_rgmii, 0x1c, 4),
+	CYGNUS_PIN_GROUP(camera_sram_rgmii, 0x1c, 8),
+	CYGNUS_PIN_GROUP(qspi_gpio, 0x1c, 12),
+	CYGNUS_PIN_GROUP(smart_card0_fcb, 0x20, 0),
+	CYGNUS_PIN_GROUP(smart_card1_fcb, 0x20, 4),
+	CYGNUS_PIN_GROUP(gpio0_3p3, 0x28, 0),
+	CYGNUS_PIN_GROUP(gpio1_3p3, 0x28, 4),
+	CYGNUS_PIN_GROUP(gpio2_3p3, 0x28, 8),
+};
+
+#define CYGNUS_PIN_FUNCTION(fcn_name, mux_val)			\
+{								\
+	.name = #fcn_name,					\
+	.group_names = cygnus_pin_group_names,			\
+	.num_groups = ARRAY_SIZE(cygnus_pin_group_names),	\
+	.mux = mux_val,						\
+}
+
+/*
+ * Cygnus has 4 alternate functions. All groups can be configured to any of
+ * the 4 alternate functions
+ */
+static const struct cygnus_pin_function cygnus_pin_functions[] = {
+	CYGNUS_PIN_FUNCTION(alt1, 0),
+	CYGNUS_PIN_FUNCTION(alt2, 1),
+	CYGNUS_PIN_FUNCTION(alt3, 2),
+	CYGNUS_PIN_FUNCTION(alt4, 3),
+};
+
+static int cygnus_get_groups_count(struct pinctrl_dev *pctrl_dev)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->num_groups;
+}
+
+static const char *cygnus_get_group_name(struct pinctrl_dev *pctrl_dev,
+		unsigned selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->groups[selector].name;
+}
+
+static int cygnus_get_group_pins(struct pinctrl_dev *pctrl_dev,
+		unsigned selector, const unsigned **pins,
+		unsigned *num_pins)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	*pins = pinctrl->groups[selector].pins;
+	*num_pins = pinctrl->groups[selector].num_pins;
+
+	return 0;
+}
+
+static void cygnus_pin_dbg_show(struct pinctrl_dev *pctrl_dev,
+		struct seq_file *s, unsigned offset)
+{
+	seq_printf(s, " %s", dev_name(pctrl_dev->dev));
+}
+
+static int find_matched_function(const char *function_name)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(cygnus_pin_functions); i++) {
+		if (!strcmp(cygnus_pin_functions[i].name, function_name))
+			return (int)cygnus_pin_functions[i].mux;
+	}
+
+	return -EINVAL;
+}
+
+static int cygnus_dt_node_to_map(struct pinctrl_dev *pctrl_dev,
+		struct device_node *np, struct pinctrl_map **map,
+		unsigned *num_maps)
+{
+	int ret, num_groups;
+	unsigned reserved_maps = 0;
+	struct property *prop;
+	const char *group_name, *function_name;
+
+	*map = NULL;
+	*num_maps = 0;
+
+	num_groups = of_property_count_strings(np, "brcm,groups");
+	if (num_groups < 0) {
+		dev_err(pctrl_dev->dev,
+			"could not parse property brcm,groups\n");
+		return -EINVAL;
+	}
+
+	ret = of_property_read_string(np, "brcm,function", &function_name);
+	if (ret < 0) {
+		dev_err(pctrl_dev->dev,
+			"could not parse property brcm,function\n");
+		return -EINVAL;
+	}
+
+	/* make sure it's a valid alternate function */
+	ret = find_matched_function(function_name);
+	if (ret < 0) {
+		dev_err(pctrl_dev->dev, "invalid function name: %s\n",
+				function_name);
+	}
+
+	ret = pinctrl_utils_reserve_map(pctrl_dev, map, &reserved_maps,
+			num_maps, num_groups);
+	if (ret) {
+		dev_err(pctrl_dev->dev, "unable to reserve map\n");
+		return ret;
+	}
+
+	of_property_for_each_string(np, "brcm,groups", prop, group_name) {
+		ret = pinctrl_utils_add_map_mux(pctrl_dev, map,
+				&reserved_maps, num_maps, group_name,
+				function_name);
+		if (ret) {
+			dev_err(pctrl_dev->dev, "can't add map: %d\n", ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static struct pinctrl_ops cygnus_pinctrl_ops = {
+	.get_groups_count = cygnus_get_groups_count,
+	.get_group_name = cygnus_get_group_name,
+	.get_group_pins = cygnus_get_group_pins,
+	.pin_dbg_show = cygnus_pin_dbg_show,
+	.dt_node_to_map = cygnus_dt_node_to_map,
+	.dt_free_map = pinctrl_utils_dt_free_map,
+};
+
+static int cygnus_get_functions_count(struct pinctrl_dev *pctrl_dev)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->num_functions;
+}
+
+static const char *cygnus_get_function_name(struct pinctrl_dev *pctrl_dev,
+		unsigned selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->functions[selector].name;
+}
+
+static int cygnus_get_function_groups(struct pinctrl_dev *pctrl_dev,
+	unsigned selector, const char * const **groups,
+	unsigned * const num_groups)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	*groups = pinctrl->functions[selector].group_names;
+	*num_groups = pinctrl->functions[selector].num_groups;
+
+	return 0;
+}
+
+static int cygnus_pinmux_set_mux(struct pinctrl_dev *pctrl_dev,
+		unsigned function_selector, unsigned group_selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+	const struct cygnus_pin_function *function =
+			&pinctrl->functions[function_selector];
+	const struct cygnus_pin_group *group =
+			&pinctrl->groups[group_selector];
+	u32 val, mask = 0x7;
+
+	dev_dbg(pctrl_dev->dev,
+	"group:%s with offset:0x%08x shift:%u set to function: %s mux:%u\n",
+		group->name, group->offset, group->shift, function->name,
+		function->mux);
+
+	val = readl(pinctrl->base + group->offset);
+	val &= ~(mask << group->shift);
+	val |= function->mux << group->shift;
+	writel(val, pinctrl->base + group->offset);
+
+	return 0;
+}
+
+static struct pinmux_ops cygnus_pinmux_ops = {
+	.get_functions_count = cygnus_get_functions_count,
+	.get_function_name = cygnus_get_function_name,
+	.get_function_groups = cygnus_get_function_groups,
+	.set_mux = cygnus_pinmux_set_mux,
+};
+
+static struct pinctrl_desc cygnus_pinctrl_desc = {
+	.pctlops = &cygnus_pinctrl_ops,
+	.pmxops = &cygnus_pinmux_ops,
+	.owner = THIS_MODULE,
+};
+
+static int cygnus_pinctrl_probe(struct platform_device *pdev)
+{
+	struct cygnus_pinctrl *pinctrl;
+	struct resource *res;
+
+	pinctrl = devm_kzalloc(&pdev->dev, sizeof(*pinctrl), GFP_KERNEL);
+	if (!pinctrl) {
+		dev_err(&pdev->dev, "unable to allocate memory\n");
+		return -ENOMEM;
+	}
+	pinctrl->dev = &pdev->dev;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "unable to get resource\n");
+		return -ENOENT;
+	}
+
+	pinctrl->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(pinctrl->base)) {
+		dev_err(&pdev->dev, "unable to map I/O space\n");
+		return PTR_ERR(pinctrl->base);
+	}
+
+	pinctrl->pins = cygnus_pinctrl_pins;
+	pinctrl->num_pins = ARRAY_SIZE(cygnus_pinctrl_pins);
+	pinctrl->groups = cygnus_pin_groups;
+	pinctrl->num_groups = ARRAY_SIZE(cygnus_pin_groups);
+	pinctrl->functions = cygnus_pin_functions;
+	pinctrl->num_functions = ARRAY_SIZE(cygnus_pin_functions);
+
+	cygnus_pinctrl_desc.name = dev_name(&pdev->dev);
+	cygnus_pinctrl_desc.pins = cygnus_pinctrl_pins;
+	cygnus_pinctrl_desc.npins = ARRAY_SIZE(cygnus_pinctrl_pins);
+
+	pinctrl->pctl = pinctrl_register(&cygnus_pinctrl_desc, &pdev->dev,
+			pinctrl);
+	if (!pinctrl->pctl) {
+		dev_err(&pdev->dev, "unable to register cygnus pinctrl\n");
+		return -EINVAL;
+	}
+
+	platform_set_drvdata(pdev, pinctrl);
+
+	return 0;
+}
+
+static int cygnus_pinctrl_remove(struct platform_device *pdev)
+{
+	struct cygnus_pinctrl *pinctrl = platform_get_drvdata(pdev);
+
+	pinctrl_unregister(pinctrl->pctl);
+	platform_set_drvdata(pdev, NULL);
+
+	return 0;
+}
+
+static struct of_device_id cygnus_pinctrl_of_match[] = {
+	{ .compatible = "brcm,cygnus-pinctrl", },
+	{ },
+};
+
+static struct platform_driver cygnus_pinctrl_driver = {
+	.driver = {
+		.name = "cygnus-pinctrl",
+		.owner = THIS_MODULE,
+		.of_match_table = cygnus_pinctrl_of_match,
+	},
+	.probe = cygnus_pinctrl_probe,
+	.remove = cygnus_pinctrl_remove,
+};
+
+static int __init cygnus_pinctrl_init(void)
+{
+	return platform_driver_register(&cygnus_pinctrl_driver);
+}
+arch_initcall(cygnus_pinctrl_init);
+
+static void __exit cygnus_pinctrl_exit(void)
+{
+	platform_driver_unregister(&cygnus_pinctrl_driver);
+}
+module_exit(cygnus_pinctrl_exit);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus pinctrl driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH 2/4] pinctrl: cygnus: add initial pinctrl support

[Ray Jui]

This adds the initial driver support for the Broadcom Cygnus pinctrl
controller. The Cygnus pinctrl controller supports group based
alternate function configuration

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
---
 drivers/pinctrl/Kconfig              |    7 +
 drivers/pinctrl/Makefile             |    1 +
 drivers/pinctrl/pinctrl-bcm-cygnus.c |  753 ++++++++++++++++++++++++++++++++++
 3 files changed, 761 insertions(+)
 create mode 100644 drivers/pinctrl/pinctrl-bcm-cygnus.c

diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index d014f22..4549e9f 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -85,6 +85,13 @@ config PINCTRL_BCM281XX
 	  BCM28145, and BCM28155 SoCs.  This driver requires the pinctrl
 	  framework.  GPIO is provided by a separate GPIO driver.
 
+config PINCTRL_BCM_CYGNUS
+	bool "Broadcom Cygnus pinctrl driver"
+	depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
+	select PINMUX
+	select PINCONF
+	select GENERIC_PINCONF
+
 config PINCTRL_LANTIQ
 	bool
 	depends on LANTIQ
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index c030b3d..4ed8e8a 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_PINCTRL_BF60x)	+= pinctrl-adi2-bf60x.o
 obj-$(CONFIG_PINCTRL_AT91)	+= pinctrl-at91.o
 obj-$(CONFIG_PINCTRL_BCM2835)	+= pinctrl-bcm2835.o
 obj-$(CONFIG_PINCTRL_BCM281XX)	+= pinctrl-bcm281xx.o
+obj-$(CONFIG_PINCTRL_BCM_CYGNUS)	+= pinctrl-bcm-cygnus.o
 obj-$(CONFIG_PINCTRL_FALCON)	+= pinctrl-falcon.o
 obj-$(CONFIG_PINCTRL_PALMAS)	+= pinctrl-palmas.o
 obj-$(CONFIG_PINCTRL_ROCKCHIP)	+= pinctrl-rockchip.o
diff --git a/drivers/pinctrl/pinctrl-bcm-cygnus.c b/drivers/pinctrl/pinctrl-bcm-cygnus.c
new file mode 100644
index 0000000..eb6e27a
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-bcm-cygnus.c
@@ -0,0 +1,753 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/slab.h>
+
+#include "core.h"
+#include "pinctrl-utils.h"
+
+/*
+ * Alternate function configuration
+ *
+ * @name: name of the alternate function
+ * @group_names: array of strings of group names that can be supported by this
+ * alternate function
+ * @num_groups: total number of groups that can be supported by this alternate
+ * function
+ * @mux: mux setting for this alternate function to be programed
+ */
+struct cygnus_pin_function {
+	const char *name;
+	const char * const *group_names;
+	const unsigned num_groups;
+	unsigned int mux;
+};
+
+/*
+ * Cygnus allows group based pinmux configuration
+ *
+ * @name: name of the group
+ * @pins: array of pins used by this group
+ * @num_pins: total number of pins used by this group
+ * @offset: register offset for pinmux configuration of this group
+ * @shift: bit shift for pinmux configuration of this group
+ */
+struct cygnus_pin_group {
+	const char *name;
+	const unsigned *pins;
+	const unsigned num_pins;
+	const unsigned int offset;
+	const unsigned int shift;
+};
+
+/*
+ * Cygnus pinctrl core
+ *
+ * @pctl: pointer to pinctrl_dev
+ * @dev: pointer to the device
+ * @base: I/O register base for Cygnus pinctrl configuration
+ *
+ */
+struct cygnus_pinctrl {
+	struct pinctrl_dev *pctl;
+	struct device *dev;
+	void __iomem *base;
+
+	const struct pinctrl_pin_desc *pins;
+	unsigned num_pins;
+
+	const struct cygnus_pin_group *groups;
+	unsigned num_groups;
+
+	const struct cygnus_pin_function *functions;
+	unsigned num_functions;
+};
+
+#define CYGNUS_PIN_GROUP(group_name, off, sh)		\
+{							\
+	.name = #group_name,				\
+	.pins = group_name##_pins,			\
+	.num_pins = ARRAY_SIZE(group_name##_pins),	\
+	.offset = off,					\
+	.shift = sh,					\
+}
+
+/*
+ * The following pin description is based on Cygnus I/O MUX spreadsheet
+ */
+static const struct pinctrl_pin_desc cygnus_pinctrl_pins[] = {
+	PINCTRL_PIN(0, "ext_device_reset_n"),
+	PINCTRL_PIN(1, "chip_mode0"),
+	PINCTRL_PIN(2, "chip_mode1"),
+	PINCTRL_PIN(3, "chip_mode2"),
+	PINCTRL_PIN(4, "chip_mode3"),
+	PINCTRL_PIN(5, "chip_mode4"),
+	PINCTRL_PIN(6, "bsc0_scl"),
+	PINCTRL_PIN(7, "bsc0_sda"),
+	PINCTRL_PIN(8, "bsc1_scl"),
+	PINCTRL_PIN(9, "bsc1_sda"),
+	PINCTRL_PIN(10, "d1w_dq"),
+	PINCTRL_PIN(11, "d1wowstz_l"),
+	PINCTRL_PIN(12, "gpio0"),
+	PINCTRL_PIN(13, "gpio1"),
+	PINCTRL_PIN(14, "gpio2"),
+	PINCTRL_PIN(15, "gpio3"),
+	PINCTRL_PIN(16, "gpio4"),
+	PINCTRL_PIN(17, "gpio5"),
+	PINCTRL_PIN(18, "gpio6"),
+	PINCTRL_PIN(19, "gpio7"),
+	PINCTRL_PIN(20, "gpio8"),
+	PINCTRL_PIN(21, "gpio9"),
+	PINCTRL_PIN(22, "gpio10"),
+	PINCTRL_PIN(23, "gpio11"),
+	PINCTRL_PIN(24, "gpio12"),
+	PINCTRL_PIN(25, "gpio13"),
+	PINCTRL_PIN(26, "gpio14"),
+	PINCTRL_PIN(27, "gpio15"),
+	PINCTRL_PIN(28, "gpio16"),
+	PINCTRL_PIN(29, "gpio17"),
+	PINCTRL_PIN(30, "gpio18"),
+	PINCTRL_PIN(31, "gpio19"),
+	PINCTRL_PIN(32, "gpio20"),
+	PINCTRL_PIN(33, "gpio21"),
+	PINCTRL_PIN(34, "gpio22"),
+	PINCTRL_PIN(35, "gpio23"),
+	PINCTRL_PIN(36, "mdc"),
+	PINCTRL_PIN(37, "mdio"),
+	PINCTRL_PIN(38, "pwm0"),
+	PINCTRL_PIN(39, "pwm1"),
+	PINCTRL_PIN(40, "pwm2"),
+	PINCTRL_PIN(41, "pwm3"),
+	PINCTRL_PIN(42, "sc0_clk"),
+	PINCTRL_PIN(43, "sc0_cmdvcc_l"),
+	PINCTRL_PIN(44, "sc0_detect"),
+	PINCTRL_PIN(45, "sc0_fcb"),
+	PINCTRL_PIN(46, "sc0_io"),
+	PINCTRL_PIN(47, "sc0_rst_l"),
+	PINCTRL_PIN(48, "sc1_clk"),
+	PINCTRL_PIN(49, "sc1_cmdvcc_l"),
+	PINCTRL_PIN(50, "sc1_detect"),
+	PINCTRL_PIN(51, "sc1_fcb"),
+	PINCTRL_PIN(52, "sc1_io"),
+	PINCTRL_PIN(53, "sc1_rst_l"),
+	PINCTRL_PIN(54, "spi0_clk"),
+	PINCTRL_PIN(55, "spi0_mosi"),
+	PINCTRL_PIN(56, "spi0_miso"),
+	PINCTRL_PIN(57, "spi0_ss"),
+	PINCTRL_PIN(58, "spi1_clk"),
+	PINCTRL_PIN(59, "spi1_mosi"),
+	PINCTRL_PIN(60, "spi1_miso"),
+	PINCTRL_PIN(61, "spi1_ss"),
+	PINCTRL_PIN(62, "spi2_clk"),
+	PINCTRL_PIN(63, "spi2_mosi"),
+	PINCTRL_PIN(64, "spi2_miso"),
+	PINCTRL_PIN(65, "spi2_ss"),
+	PINCTRL_PIN(66, "spi3_clk"),
+	PINCTRL_PIN(67, "spi3_mosi"),
+	PINCTRL_PIN(68, "spi3_miso"),
+	PINCTRL_PIN(69, "spi3_ss"),
+	PINCTRL_PIN(70, "uart0_cts"),
+	PINCTRL_PIN(71, "uart0_rts"),
+	PINCTRL_PIN(72, "uart0_rx"),
+	PINCTRL_PIN(73, "uart0_tx"),
+	PINCTRL_PIN(74, "uart1_cts"),
+	PINCTRL_PIN(75, "uart1_dcd"),
+	PINCTRL_PIN(76, "uart1_dsr"),
+	PINCTRL_PIN(77, "uart1_dtr"),
+	PINCTRL_PIN(78, "uart1_ri"),
+	PINCTRL_PIN(79, "uart1_rts"),
+	PINCTRL_PIN(80, "uart1_rx"),
+	PINCTRL_PIN(81, "uart1_tx"),
+	PINCTRL_PIN(82, "uart3_rx"),
+	PINCTRL_PIN(83, "uart3_tx"),
+	PINCTRL_PIN(84, "sdio1_clk_sdcard"),
+	PINCTRL_PIN(85, "sdio1_cmd"),
+	PINCTRL_PIN(86, "sdio1_data0"),
+	PINCTRL_PIN(87, "sdio1_data1"),
+	PINCTRL_PIN(88, "sdio1_data2"),
+	PINCTRL_PIN(89, "sdio1_data3"),
+	PINCTRL_PIN(90, "sdio1_wp_n"),
+	PINCTRL_PIN(91, "sdio1_card_rst"),
+	PINCTRL_PIN(92, "sdio1_led_on"),
+	PINCTRL_PIN(93, "sdio1_cd"),
+	PINCTRL_PIN(94, "sdio0_clk_sdcard"),
+	PINCTRL_PIN(95, "sdio0_cmd"),
+	PINCTRL_PIN(96, "sdio0_data0"),
+	PINCTRL_PIN(97, "sdio0_data1"),
+	PINCTRL_PIN(98, "sdio0_data2"),
+	PINCTRL_PIN(99, "sdio0_data3"),
+	PINCTRL_PIN(100, "sdio0_wp_n"),
+	PINCTRL_PIN(101, "sdio0_card_rst"),
+	PINCTRL_PIN(102, "sdio0_led_on"),
+	PINCTRL_PIN(103, "sdio0_cd"),
+	PINCTRL_PIN(104, "sflash_clk"),
+	PINCTRL_PIN(105, "sflash_cs_l"),
+	PINCTRL_PIN(106, "sflash_mosi"),
+	PINCTRL_PIN(107, "sflash_miso"),
+	PINCTRL_PIN(108, "sflash_wp_n"),
+	PINCTRL_PIN(109, "sflash_hold_n"),
+	PINCTRL_PIN(110, "nand_ale"),
+	PINCTRL_PIN(111, "nand_ce0_l"),
+	PINCTRL_PIN(112, "nand_ce1_l"),
+	PINCTRL_PIN(113, "nand_cle"),
+	PINCTRL_PIN(114, "nand_dq0"),
+	PINCTRL_PIN(115, "nand_dq1"),
+	PINCTRL_PIN(116, "nand_dq2"),
+	PINCTRL_PIN(117, "nand_dq3"),
+	PINCTRL_PIN(118, "nand_dq4"),
+	PINCTRL_PIN(119, "nand_dq5"),
+	PINCTRL_PIN(120, "nand_dq6"),
+	PINCTRL_PIN(121, "nand_dq7"),
+	PINCTRL_PIN(122, "nand_rb_l"),
+	PINCTRL_PIN(123, "nand_re_l"),
+	PINCTRL_PIN(124, "nand_we_l"),
+	PINCTRL_PIN(125, "nand_wp_l"),
+	PINCTRL_PIN(126, "lcd_clac"),
+	PINCTRL_PIN(127, "lcd_clcp"),
+	PINCTRL_PIN(128, "lcd_cld0"),
+	PINCTRL_PIN(129, "lcd_cld1"),
+	PINCTRL_PIN(130, "lcd_cld10"),
+	PINCTRL_PIN(131, "lcd_cld11"),
+	PINCTRL_PIN(132, "lcd_cld12"),
+	PINCTRL_PIN(133, "lcd_cld13"),
+	PINCTRL_PIN(134, "lcd_cld14"),
+	PINCTRL_PIN(135, "lcd_cld15"),
+	PINCTRL_PIN(136, "lcd_cld16"),
+	PINCTRL_PIN(137, "lcd_cld17"),
+	PINCTRL_PIN(138, "lcd_cld18"),
+	PINCTRL_PIN(139, "lcd_cld19"),
+	PINCTRL_PIN(140, "lcd_cld2"),
+	PINCTRL_PIN(141, "lcd_cld20"),
+	PINCTRL_PIN(142, "lcd_cld21"),
+	PINCTRL_PIN(143, "lcd_cld22"),
+	PINCTRL_PIN(144, "lcd_cld23"),
+	PINCTRL_PIN(145, "lcd_cld3"),
+	PINCTRL_PIN(146, "lcd_cld4"),
+	PINCTRL_PIN(147, "lcd_cld5"),
+	PINCTRL_PIN(148, "lcd_cld6"),
+	PINCTRL_PIN(149, "lcd_cld7"),
+	PINCTRL_PIN(150, "lcd_cld8"),
+	PINCTRL_PIN(151, "lcd_cld9"),
+	PINCTRL_PIN(152, "lcd_clfp"),
+	PINCTRL_PIN(153, "lcd_clle"),
+	PINCTRL_PIN(154, "lcd_cllp"),
+	PINCTRL_PIN(155, "lcd_clpower"),
+	PINCTRL_PIN(156, "camera_vsync"),
+	PINCTRL_PIN(157, "camera_trigger"),
+	PINCTRL_PIN(158, "camera_strobe"),
+	PINCTRL_PIN(159, "camera_standby"),
+	PINCTRL_PIN(160, "camera_reset_n"),
+	PINCTRL_PIN(161, "camera_pixdata9"),
+	PINCTRL_PIN(162, "camera_pixdata8"),
+	PINCTRL_PIN(163, "camera_pixdata7"),
+	PINCTRL_PIN(164, "camera_pixdata6"),
+	PINCTRL_PIN(165, "camera_pixdata5"),
+	PINCTRL_PIN(166, "camera_pixdata4"),
+	PINCTRL_PIN(167, "camera_pixdata3"),
+	PINCTRL_PIN(168, "camera_pixdata2"),
+	PINCTRL_PIN(169, "camera_pixdata1"),
+	PINCTRL_PIN(170, "camera_pixdata0"),
+	PINCTRL_PIN(171, "camera_pixclk"),
+	PINCTRL_PIN(172, "camera_hsync"),
+	PINCTRL_PIN(173, "camera_pll_ref_clk"),
+	PINCTRL_PIN(174, "usb_id_indication"),
+	PINCTRL_PIN(175, "usb_vbus_indication"),
+	PINCTRL_PIN(176, "gpio0_3p3"),
+	PINCTRL_PIN(177, "gpio1_3p3"),
+	PINCTRL_PIN(178, "gpio2_3p3"),
+	PINCTRL_PIN(179, "gpio3_3p3"),
+};
+
+/*
+ * List of groups of pins
+ */
+static const unsigned gpio0_pins[] = { 12 };
+static const unsigned gpio1_pins[] = { 13 };
+static const unsigned gpio2_pins[] = { 14 };
+static const unsigned gpio3_pins[] = { 15 };
+static const unsigned gpio4_pins[] = { 16 };
+static const unsigned gpio5_pins[] = { 17 };
+static const unsigned gpio6_pins[] = { 18 };
+static const unsigned gpio7_pins[] = { 19 };
+static const unsigned gpio8_pins[] = { 20 };
+static const unsigned gpio9_pins[] = { 21 };
+static const unsigned gpio10_pins[] = { 22 };
+static const unsigned gpio11_pins[] = { 23 };
+static const unsigned gpio12_pins[] = { 24 };
+static const unsigned gpio13_pins[] = { 25 };
+static const unsigned gpio14_pins[] = { 26 };
+static const unsigned gpio15_pins[] = { 27 };
+static const unsigned gpio16_pins[] = { 28 };
+static const unsigned gpio17_pins[] = { 29 };
+static const unsigned gpio18_pins[] = { 30 };
+static const unsigned gpio19_pins[] = { 31 };
+static const unsigned gpio20_pins[] = { 32 };
+static const unsigned gpio21_pins[] = { 33 };
+static const unsigned gpio22_pins[] = { 34 };
+static const unsigned gpio23_pins[] = { 35 };
+static const unsigned pwm0_pins[] = { 38 };
+static const unsigned pwm1_pins[] = { 39 };
+static const unsigned pwm2_pins[] = { 40 };
+static const unsigned pwm3_pins[] = { 41 };
+static const unsigned sdio0_pins[] = { 94, 95, 96, 97, 98, 99 };
+static const unsigned smart_card0_pins[] = { 42, 43, 44, 46, 47 };
+static const unsigned smart_card1_pins[] = { 48, 49, 50, 52, 53 };
+static const unsigned spi0_pins[] = { 54, 55, 56, 57 };
+static const unsigned spi1_pins[] = { 58, 59, 60, 61 };
+static const unsigned spi2_pins[] = { 62, 63, 64, 65 };
+static const unsigned spi3_pins[] = { 66, 67, 68, 69 };
+static const unsigned d1w_pins[] = { 10, 11 };
+static const unsigned lcd_pins[] = { 126, 127, 128, 129, 130, 131, 132,	133,
+	134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147,
+	148, 149, 150, 151, 152, 153, 154, 155 };
+static const unsigned uart0_pins[] = { 70, 71, 72, 73 };
+static const unsigned uart1_dte_pins[] = { 75, 76, 77, 78 };
+static const unsigned uart1_pins[] = { 74, 79, 80, 81 };
+static const unsigned uart3_pins[] = { 82, 83 };
+static const unsigned qspi_pins[] = { 104, 105, 106, 107 };
+static const unsigned nand_pins[] = { 110, 111, 112, 113, 114, 115, 116, 117,
+	118, 119, 120, 121, 122, 123, 124, 125 };
+static const unsigned sdio0_cd_pins[] = { 103 };
+static const unsigned sdio0_mmc_pins[] = { 100, 101, 102 };
+static const unsigned can0_spi4_pins[] = { 86, 87 };
+static const unsigned can1_spi4_pins[] = { 88, 89 };
+static const unsigned sdio1_cd_pins[] = { 93 };
+static const unsigned sdio1_led_pins[] = { 84, 85 };
+static const unsigned sdio1_mmc_pins[] = { 90, 91, 92 };
+static const unsigned camera_led_pins[] = { 156, 157, 158, 159, 160 };
+static const unsigned camera_rgmii_pins[] = { 169, 170, 171, 169, 170, 171,
+	172, 173 };
+static const unsigned camera_sram_rgmii_pins[] = { 161, 162, 163, 164, 165,
+	166, 167, 168 };
+static const unsigned qspi_gpio_pins[] = { 108, 109 };
+static const unsigned smart_card0_fcb_pins[] = { 45 };
+static const unsigned smart_card1_fcb_pins[] = { 51 };
+static const unsigned gpio0_3p3_pins[] = { 176 };
+static const unsigned gpio1_3p3_pins[] = { 177 };
+static const unsigned gpio2_3p3_pins[] = { 178 };
+
+/*
+ * List of groups names. Need to match the order in cygnus_pin_groups
+ */
+static const char * const cygnus_pin_group_names[] = {
+	"gpio0",
+	"gpio1",
+	"gpio2",
+	"gpio3",
+	"gpio4",
+	"gpio5",
+	"gpio6",
+	"gpio7",
+	"gpio8",
+	"gpio9",
+	"gpio10",
+	"gpio11",
+	"gpio12",
+	"gpio13",
+	"gpio14",
+	"gpio15",
+	"gpio16",
+	"gpio17",
+	"gpio18",
+	"gpio19",
+	"gpio20",
+	"gpio21",
+	"gpio22",
+	"gpio23",
+	"pwm0",
+	"pwm1",
+	"pwm2",
+	"pwm3",
+	"sdio0",
+	"smart_card0",
+	"smart_card1",
+	"spi0",
+	"spi1",
+	"spi2",
+	"spi3",
+	"d1w",
+	"lcd",
+	"uart0",
+	"uart1_dte",
+	"uart1",
+	"uart3",
+	"qspi",
+	"nand",
+	"sdio0_cd",
+	"sdio0_mmc",
+	"can0_spi4",
+	"can1_spi4",
+	"sdio1_cd",
+	"sdio1_led",
+	"sdio1_mmc",
+	"camera_led",
+	"camera_rgmii",
+	"camera_sram_rgmii",
+	"qspi_gpio",
+	"smart_card0_fcb",
+	"smart_card1_fcb",
+	"gpio0_3p3",
+	"gpio1_3p3",
+	"gpio2_3p3",
+};
+
+/*
+ * List of groups. Need to match the order in cygnus_pin_group_names
+ */
+static const struct cygnus_pin_group cygnus_pin_groups[] = {
+	CYGNUS_PIN_GROUP(gpio0, 0x0, 0),
+	CYGNUS_PIN_GROUP(gpio1, 0x0, 4),
+	CYGNUS_PIN_GROUP(gpio2, 0x0, 8),
+	CYGNUS_PIN_GROUP(gpio3, 0x0, 12),
+	CYGNUS_PIN_GROUP(gpio4, 0x0, 16),
+	CYGNUS_PIN_GROUP(gpio5, 0x0, 20),
+	CYGNUS_PIN_GROUP(gpio6, 0x0, 24),
+	CYGNUS_PIN_GROUP(gpio7, 0x0, 28),
+	CYGNUS_PIN_GROUP(gpio8, 0x4, 0),
+	CYGNUS_PIN_GROUP(gpio9, 0x4, 4),
+	CYGNUS_PIN_GROUP(gpio10, 0x4, 8),
+	CYGNUS_PIN_GROUP(gpio11, 0x4, 12),
+	CYGNUS_PIN_GROUP(gpio12, 0x4, 16),
+	CYGNUS_PIN_GROUP(gpio13, 0x4, 20),
+	CYGNUS_PIN_GROUP(gpio14, 0x4, 24),
+	CYGNUS_PIN_GROUP(gpio15, 0x4, 28),
+	CYGNUS_PIN_GROUP(gpio16, 0x8, 0),
+	CYGNUS_PIN_GROUP(gpio17, 0x8, 4),
+	CYGNUS_PIN_GROUP(gpio18, 0x8, 8),
+	CYGNUS_PIN_GROUP(gpio19, 0x8, 12),
+	CYGNUS_PIN_GROUP(gpio20, 0x8, 16),
+	CYGNUS_PIN_GROUP(gpio21, 0x8, 20),
+	CYGNUS_PIN_GROUP(gpio22, 0x8, 24),
+	CYGNUS_PIN_GROUP(gpio23, 0x8, 28),
+	CYGNUS_PIN_GROUP(pwm0, 0xc, 0),
+	CYGNUS_PIN_GROUP(pwm1, 0xc, 4),
+	CYGNUS_PIN_GROUP(pwm2, 0xc, 8),
+	CYGNUS_PIN_GROUP(pwm3, 0xc, 12),
+	CYGNUS_PIN_GROUP(sdio0, 0xc, 16),
+	CYGNUS_PIN_GROUP(smart_card0, 0xc, 20),
+	CYGNUS_PIN_GROUP(smart_card1, 0xc, 24),
+	CYGNUS_PIN_GROUP(spi0, 0x10, 0),
+	CYGNUS_PIN_GROUP(spi1, 0x10, 4),
+	CYGNUS_PIN_GROUP(spi2, 0x10, 8),
+	CYGNUS_PIN_GROUP(spi3, 0x10, 12),
+	CYGNUS_PIN_GROUP(d1w, 0x10, 16),
+	CYGNUS_PIN_GROUP(lcd, 0x10, 20),
+	CYGNUS_PIN_GROUP(uart0, 0x14, 0),
+	CYGNUS_PIN_GROUP(uart1_dte, 0x14, 4),
+	CYGNUS_PIN_GROUP(uart1, 0x14, 8),
+	CYGNUS_PIN_GROUP(uart3, 0x14, 12),
+	CYGNUS_PIN_GROUP(qspi, 0x14, 16),
+	CYGNUS_PIN_GROUP(nand, 0x14, 20),
+	CYGNUS_PIN_GROUP(sdio0_cd, 0x18, 0),
+	CYGNUS_PIN_GROUP(sdio0_mmc, 0x18, 4),
+	CYGNUS_PIN_GROUP(can0_spi4, 0x18, 8),
+	CYGNUS_PIN_GROUP(can1_spi4, 0x18, 12),
+	CYGNUS_PIN_GROUP(sdio1_cd, 0x18, 16),
+	CYGNUS_PIN_GROUP(sdio1_led, 0x18, 20),
+	CYGNUS_PIN_GROUP(sdio1_mmc, 0x18, 24),
+	CYGNUS_PIN_GROUP(camera_led, 0x1c, 0),
+	CYGNUS_PIN_GROUP(camera_rgmii, 0x1c, 4),
+	CYGNUS_PIN_GROUP(camera_sram_rgmii, 0x1c, 8),
+	CYGNUS_PIN_GROUP(qspi_gpio, 0x1c, 12),
+	CYGNUS_PIN_GROUP(smart_card0_fcb, 0x20, 0),
+	CYGNUS_PIN_GROUP(smart_card1_fcb, 0x20, 4),
+	CYGNUS_PIN_GROUP(gpio0_3p3, 0x28, 0),
+	CYGNUS_PIN_GROUP(gpio1_3p3, 0x28, 4),
+	CYGNUS_PIN_GROUP(gpio2_3p3, 0x28, 8),
+};
+
+#define CYGNUS_PIN_FUNCTION(fcn_name, mux_val)			\
+{								\
+	.name = #fcn_name,					\
+	.group_names = cygnus_pin_group_names,			\
+	.num_groups = ARRAY_SIZE(cygnus_pin_group_names),	\
+	.mux = mux_val,						\
+}
+
+/*
+ * Cygnus has 4 alternate functions. All groups can be configured to any of
+ * the 4 alternate functions
+ */
+static const struct cygnus_pin_function cygnus_pin_functions[] = {
+	CYGNUS_PIN_FUNCTION(alt1, 0),
+	CYGNUS_PIN_FUNCTION(alt2, 1),
+	CYGNUS_PIN_FUNCTION(alt3, 2),
+	CYGNUS_PIN_FUNCTION(alt4, 3),
+};
+
+static int cygnus_get_groups_count(struct pinctrl_dev *pctrl_dev)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->num_groups;
+}
+
+static const char *cygnus_get_group_name(struct pinctrl_dev *pctrl_dev,
+		unsigned selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->groups[selector].name;
+}
+
+static int cygnus_get_group_pins(struct pinctrl_dev *pctrl_dev,
+		unsigned selector, const unsigned **pins,
+		unsigned *num_pins)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	*pins = pinctrl->groups[selector].pins;
+	*num_pins = pinctrl->groups[selector].num_pins;
+
+	return 0;
+}
+
+static void cygnus_pin_dbg_show(struct pinctrl_dev *pctrl_dev,
+		struct seq_file *s, unsigned offset)
+{
+	seq_printf(s, " %s", dev_name(pctrl_dev->dev));
+}
+
+static int find_matched_function(const char *function_name)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(cygnus_pin_functions); i++) {
+		if (!strcmp(cygnus_pin_functions[i].name, function_name))
+			return (int)cygnus_pin_functions[i].mux;
+	}
+
+	return -EINVAL;
+}
+
+static int cygnus_dt_node_to_map(struct pinctrl_dev *pctrl_dev,
+		struct device_node *np, struct pinctrl_map **map,
+		unsigned *num_maps)
+{
+	int ret, num_groups;
+	unsigned reserved_maps = 0;
+	struct property *prop;
+	const char *group_name, *function_name;
+
+	*map = NULL;
+	*num_maps = 0;
+
+	num_groups = of_property_count_strings(np, "brcm,groups");
+	if (num_groups < 0) {
+		dev_err(pctrl_dev->dev,
+			"could not parse property brcm,groups\n");
+		return -EINVAL;
+	}
+
+	ret = of_property_read_string(np, "brcm,function", &function_name);
+	if (ret < 0) {
+		dev_err(pctrl_dev->dev,
+			"could not parse property brcm,function\n");
+		return -EINVAL;
+	}
+
+	/* make sure it's a valid alternate function */
+	ret = find_matched_function(function_name);
+	if (ret < 0) {
+		dev_err(pctrl_dev->dev, "invalid function name: %s\n",
+				function_name);
+	}
+
+	ret = pinctrl_utils_reserve_map(pctrl_dev, map, &reserved_maps,
+			num_maps, num_groups);
+	if (ret) {
+		dev_err(pctrl_dev->dev, "unable to reserve map\n");
+		return ret;
+	}
+
+	of_property_for_each_string(np, "brcm,groups", prop, group_name) {
+		ret = pinctrl_utils_add_map_mux(pctrl_dev, map,
+				&reserved_maps, num_maps, group_name,
+				function_name);
+		if (ret) {
+			dev_err(pctrl_dev->dev, "can't add map: %d\n", ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static struct pinctrl_ops cygnus_pinctrl_ops = {
+	.get_groups_count = cygnus_get_groups_count,
+	.get_group_name = cygnus_get_group_name,
+	.get_group_pins = cygnus_get_group_pins,
+	.pin_dbg_show = cygnus_pin_dbg_show,
+	.dt_node_to_map = cygnus_dt_node_to_map,
+	.dt_free_map = pinctrl_utils_dt_free_map,
+};
+
+static int cygnus_get_functions_count(struct pinctrl_dev *pctrl_dev)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->num_functions;
+}
+
+static const char *cygnus_get_function_name(struct pinctrl_dev *pctrl_dev,
+		unsigned selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->functions[selector].name;
+}
+
+static int cygnus_get_function_groups(struct pinctrl_dev *pctrl_dev,
+	unsigned selector, const char * const **groups,
+	unsigned * const num_groups)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	*groups = pinctrl->functions[selector].group_names;
+	*num_groups = pinctrl->functions[selector].num_groups;
+
+	return 0;
+}
+
+static int cygnus_pinmux_set_mux(struct pinctrl_dev *pctrl_dev,
+		unsigned function_selector, unsigned group_selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+	const struct cygnus_pin_function *function =
+			&pinctrl->functions[function_selector];
+	const struct cygnus_pin_group *group =
+			&pinctrl->groups[group_selector];
+	u32 val, mask = 0x7;
+
+	dev_dbg(pctrl_dev->dev,
+	"group:%s with offset:0x%08x shift:%u set to function: %s mux:%u\n",
+		group->name, group->offset, group->shift, function->name,
+		function->mux);
+
+	val = readl(pinctrl->base + group->offset);
+	val &= ~(mask << group->shift);
+	val |= function->mux << group->shift;
+	writel(val, pinctrl->base + group->offset);
+
+	return 0;
+}
+
+static struct pinmux_ops cygnus_pinmux_ops = {
+	.get_functions_count = cygnus_get_functions_count,
+	.get_function_name = cygnus_get_function_name,
+	.get_function_groups = cygnus_get_function_groups,
+	.set_mux = cygnus_pinmux_set_mux,
+};
+
+static struct pinctrl_desc cygnus_pinctrl_desc = {
+	.pctlops = &cygnus_pinctrl_ops,
+	.pmxops = &cygnus_pinmux_ops,
+	.owner = THIS_MODULE,
+};
+
+static int cygnus_pinctrl_probe(struct platform_device *pdev)
+{
+	struct cygnus_pinctrl *pinctrl;
+	struct resource *res;
+
+	pinctrl = devm_kzalloc(&pdev->dev, sizeof(*pinctrl), GFP_KERNEL);
+	if (!pinctrl) {
+		dev_err(&pdev->dev, "unable to allocate memory\n");
+		return -ENOMEM;
+	}
+	pinctrl->dev = &pdev->dev;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "unable to get resource\n");
+		return -ENOENT;
+	}
+
+	pinctrl->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(pinctrl->base)) {
+		dev_err(&pdev->dev, "unable to map I/O space\n");
+		return PTR_ERR(pinctrl->base);
+	}
+
+	pinctrl->pins = cygnus_pinctrl_pins;
+	pinctrl->num_pins = ARRAY_SIZE(cygnus_pinctrl_pins);
+	pinctrl->groups = cygnus_pin_groups;
+	pinctrl->num_groups = ARRAY_SIZE(cygnus_pin_groups);
+	pinctrl->functions = cygnus_pin_functions;
+	pinctrl->num_functions = ARRAY_SIZE(cygnus_pin_functions);
+
+	cygnus_pinctrl_desc.name = dev_name(&pdev->dev);
+	cygnus_pinctrl_desc.pins = cygnus_pinctrl_pins;
+	cygnus_pinctrl_desc.npins = ARRAY_SIZE(cygnus_pinctrl_pins);
+
+	pinctrl->pctl = pinctrl_register(&cygnus_pinctrl_desc, &pdev->dev,
+			pinctrl);
+	if (!pinctrl->pctl) {
+		dev_err(&pdev->dev, "unable to register cygnus pinctrl\n");
+		return -EINVAL;
+	}
+
+	platform_set_drvdata(pdev, pinctrl);
+
+	return 0;
+}
+
+static int cygnus_pinctrl_remove(struct platform_device *pdev)
+{
+	struct cygnus_pinctrl *pinctrl = platform_get_drvdata(pdev);
+
+	pinctrl_unregister(pinctrl->pctl);
+	platform_set_drvdata(pdev, NULL);
+
+	return 0;
+}
+
+static struct of_device_id cygnus_pinctrl_of_match[] = {
+	{ .compatible = "brcm,cygnus-pinctrl", },
+	{ },
+};
+
+static struct platform_driver cygnus_pinctrl_driver = {
+	.driver = {
+		.name = "cygnus-pinctrl",
+		.owner = THIS_MODULE,
+		.of_match_table = cygnus_pinctrl_of_match,
+	},
+	.probe = cygnus_pinctrl_probe,
+	.remove = cygnus_pinctrl_remove,
+};
+
+static int __init cygnus_pinctrl_init(void)
+{
+	return platform_driver_register(&cygnus_pinctrl_driver);
+}
+arch_initcall(cygnus_pinctrl_init);
+
+static void __exit cygnus_pinctrl_exit(void)
+{
+	platform_driver_unregister(&cygnus_pinctrl_driver);
+}
+module_exit(cygnus_pinctrl_exit);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus pinctrl driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH 2/4] pinctrl: cygnus: add initial pinctrl support

[Ray Jui]

This adds the initial driver support for the Broadcom Cygnus pinctrl
controller. The Cygnus pinctrl controller supports group based
alternate function configuration

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
---
 drivers/pinctrl/Kconfig              |    7 +
 drivers/pinctrl/Makefile             |    1 +
 drivers/pinctrl/pinctrl-bcm-cygnus.c |  753 ++++++++++++++++++++++++++++++++++
 3 files changed, 761 insertions(+)
 create mode 100644 drivers/pinctrl/pinctrl-bcm-cygnus.c

diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index d014f22..4549e9f 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -85,6 +85,13 @@ config PINCTRL_BCM281XX
 	  BCM28145, and BCM28155 SoCs.  This driver requires the pinctrl
 	  framework.  GPIO is provided by a separate GPIO driver.
 
+config PINCTRL_BCM_CYGNUS
+	bool "Broadcom Cygnus pinctrl driver"
+	depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
+	select PINMUX
+	select PINCONF
+	select GENERIC_PINCONF
+
 config PINCTRL_LANTIQ
 	bool
 	depends on LANTIQ
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index c030b3d..4ed8e8a 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_PINCTRL_BF60x)	+= pinctrl-adi2-bf60x.o
 obj-$(CONFIG_PINCTRL_AT91)	+= pinctrl-at91.o
 obj-$(CONFIG_PINCTRL_BCM2835)	+= pinctrl-bcm2835.o
 obj-$(CONFIG_PINCTRL_BCM281XX)	+= pinctrl-bcm281xx.o
+obj-$(CONFIG_PINCTRL_BCM_CYGNUS)	+= pinctrl-bcm-cygnus.o
 obj-$(CONFIG_PINCTRL_FALCON)	+= pinctrl-falcon.o
 obj-$(CONFIG_PINCTRL_PALMAS)	+= pinctrl-palmas.o
 obj-$(CONFIG_PINCTRL_ROCKCHIP)	+= pinctrl-rockchip.o
diff --git a/drivers/pinctrl/pinctrl-bcm-cygnus.c b/drivers/pinctrl/pinctrl-bcm-cygnus.c
new file mode 100644
index 0000000..eb6e27a
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-bcm-cygnus.c
@@ -0,0 +1,753 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/slab.h>
+
+#include "core.h"
+#include "pinctrl-utils.h"
+
+/*
+ * Alternate function configuration
+ *
+ * @name: name of the alternate function
+ * @group_names: array of strings of group names that can be supported by this
+ * alternate function
+ * @num_groups: total number of groups that can be supported by this alternate
+ * function
+ * @mux: mux setting for this alternate function to be programed
+ */
+struct cygnus_pin_function {
+	const char *name;
+	const char * const *group_names;
+	const unsigned num_groups;
+	unsigned int mux;
+};
+
+/*
+ * Cygnus allows group based pinmux configuration
+ *
+ * @name: name of the group
+ * @pins: array of pins used by this group
+ * @num_pins: total number of pins used by this group
+ * @offset: register offset for pinmux configuration of this group
+ * @shift: bit shift for pinmux configuration of this group
+ */
+struct cygnus_pin_group {
+	const char *name;
+	const unsigned *pins;
+	const unsigned num_pins;
+	const unsigned int offset;
+	const unsigned int shift;
+};
+
+/*
+ * Cygnus pinctrl core
+ *
+ * @pctl: pointer to pinctrl_dev
+ * @dev: pointer to the device
+ * @base: I/O register base for Cygnus pinctrl configuration
+ *
+ */
+struct cygnus_pinctrl {
+	struct pinctrl_dev *pctl;
+	struct device *dev;
+	void __iomem *base;
+
+	const struct pinctrl_pin_desc *pins;
+	unsigned num_pins;
+
+	const struct cygnus_pin_group *groups;
+	unsigned num_groups;
+
+	const struct cygnus_pin_function *functions;
+	unsigned num_functions;
+};
+
+#define CYGNUS_PIN_GROUP(group_name, off, sh)		\
+{							\
+	.name = #group_name,				\
+	.pins = group_name##_pins,			\
+	.num_pins = ARRAY_SIZE(group_name##_pins),	\
+	.offset = off,					\
+	.shift = sh,					\
+}
+
+/*
+ * The following pin description is based on Cygnus I/O MUX spreadsheet
+ */
+static const struct pinctrl_pin_desc cygnus_pinctrl_pins[] = {
+	PINCTRL_PIN(0, "ext_device_reset_n"),
+	PINCTRL_PIN(1, "chip_mode0"),
+	PINCTRL_PIN(2, "chip_mode1"),
+	PINCTRL_PIN(3, "chip_mode2"),
+	PINCTRL_PIN(4, "chip_mode3"),
+	PINCTRL_PIN(5, "chip_mode4"),
+	PINCTRL_PIN(6, "bsc0_scl"),
+	PINCTRL_PIN(7, "bsc0_sda"),
+	PINCTRL_PIN(8, "bsc1_scl"),
+	PINCTRL_PIN(9, "bsc1_sda"),
+	PINCTRL_PIN(10, "d1w_dq"),
+	PINCTRL_PIN(11, "d1wowstz_l"),
+	PINCTRL_PIN(12, "gpio0"),
+	PINCTRL_PIN(13, "gpio1"),
+	PINCTRL_PIN(14, "gpio2"),
+	PINCTRL_PIN(15, "gpio3"),
+	PINCTRL_PIN(16, "gpio4"),
+	PINCTRL_PIN(17, "gpio5"),
+	PINCTRL_PIN(18, "gpio6"),
+	PINCTRL_PIN(19, "gpio7"),
+	PINCTRL_PIN(20, "gpio8"),
+	PINCTRL_PIN(21, "gpio9"),
+	PINCTRL_PIN(22, "gpio10"),
+	PINCTRL_PIN(23, "gpio11"),
+	PINCTRL_PIN(24, "gpio12"),
+	PINCTRL_PIN(25, "gpio13"),
+	PINCTRL_PIN(26, "gpio14"),
+	PINCTRL_PIN(27, "gpio15"),
+	PINCTRL_PIN(28, "gpio16"),
+	PINCTRL_PIN(29, "gpio17"),
+	PINCTRL_PIN(30, "gpio18"),
+	PINCTRL_PIN(31, "gpio19"),
+	PINCTRL_PIN(32, "gpio20"),
+	PINCTRL_PIN(33, "gpio21"),
+	PINCTRL_PIN(34, "gpio22"),
+	PINCTRL_PIN(35, "gpio23"),
+	PINCTRL_PIN(36, "mdc"),
+	PINCTRL_PIN(37, "mdio"),
+	PINCTRL_PIN(38, "pwm0"),
+	PINCTRL_PIN(39, "pwm1"),
+	PINCTRL_PIN(40, "pwm2"),
+	PINCTRL_PIN(41, "pwm3"),
+	PINCTRL_PIN(42, "sc0_clk"),
+	PINCTRL_PIN(43, "sc0_cmdvcc_l"),
+	PINCTRL_PIN(44, "sc0_detect"),
+	PINCTRL_PIN(45, "sc0_fcb"),
+	PINCTRL_PIN(46, "sc0_io"),
+	PINCTRL_PIN(47, "sc0_rst_l"),
+	PINCTRL_PIN(48, "sc1_clk"),
+	PINCTRL_PIN(49, "sc1_cmdvcc_l"),
+	PINCTRL_PIN(50, "sc1_detect"),
+	PINCTRL_PIN(51, "sc1_fcb"),
+	PINCTRL_PIN(52, "sc1_io"),
+	PINCTRL_PIN(53, "sc1_rst_l"),
+	PINCTRL_PIN(54, "spi0_clk"),
+	PINCTRL_PIN(55, "spi0_mosi"),
+	PINCTRL_PIN(56, "spi0_miso"),
+	PINCTRL_PIN(57, "spi0_ss"),
+	PINCTRL_PIN(58, "spi1_clk"),
+	PINCTRL_PIN(59, "spi1_mosi"),
+	PINCTRL_PIN(60, "spi1_miso"),
+	PINCTRL_PIN(61, "spi1_ss"),
+	PINCTRL_PIN(62, "spi2_clk"),
+	PINCTRL_PIN(63, "spi2_mosi"),
+	PINCTRL_PIN(64, "spi2_miso"),
+	PINCTRL_PIN(65, "spi2_ss"),
+	PINCTRL_PIN(66, "spi3_clk"),
+	PINCTRL_PIN(67, "spi3_mosi"),
+	PINCTRL_PIN(68, "spi3_miso"),
+	PINCTRL_PIN(69, "spi3_ss"),
+	PINCTRL_PIN(70, "uart0_cts"),
+	PINCTRL_PIN(71, "uart0_rts"),
+	PINCTRL_PIN(72, "uart0_rx"),
+	PINCTRL_PIN(73, "uart0_tx"),
+	PINCTRL_PIN(74, "uart1_cts"),
+	PINCTRL_PIN(75, "uart1_dcd"),
+	PINCTRL_PIN(76, "uart1_dsr"),
+	PINCTRL_PIN(77, "uart1_dtr"),
+	PINCTRL_PIN(78, "uart1_ri"),
+	PINCTRL_PIN(79, "uart1_rts"),
+	PINCTRL_PIN(80, "uart1_rx"),
+	PINCTRL_PIN(81, "uart1_tx"),
+	PINCTRL_PIN(82, "uart3_rx"),
+	PINCTRL_PIN(83, "uart3_tx"),
+	PINCTRL_PIN(84, "sdio1_clk_sdcard"),
+	PINCTRL_PIN(85, "sdio1_cmd"),
+	PINCTRL_PIN(86, "sdio1_data0"),
+	PINCTRL_PIN(87, "sdio1_data1"),
+	PINCTRL_PIN(88, "sdio1_data2"),
+	PINCTRL_PIN(89, "sdio1_data3"),
+	PINCTRL_PIN(90, "sdio1_wp_n"),
+	PINCTRL_PIN(91, "sdio1_card_rst"),
+	PINCTRL_PIN(92, "sdio1_led_on"),
+	PINCTRL_PIN(93, "sdio1_cd"),
+	PINCTRL_PIN(94, "sdio0_clk_sdcard"),
+	PINCTRL_PIN(95, "sdio0_cmd"),
+	PINCTRL_PIN(96, "sdio0_data0"),
+	PINCTRL_PIN(97, "sdio0_data1"),
+	PINCTRL_PIN(98, "sdio0_data2"),
+	PINCTRL_PIN(99, "sdio0_data3"),
+	PINCTRL_PIN(100, "sdio0_wp_n"),
+	PINCTRL_PIN(101, "sdio0_card_rst"),
+	PINCTRL_PIN(102, "sdio0_led_on"),
+	PINCTRL_PIN(103, "sdio0_cd"),
+	PINCTRL_PIN(104, "sflash_clk"),
+	PINCTRL_PIN(105, "sflash_cs_l"),
+	PINCTRL_PIN(106, "sflash_mosi"),
+	PINCTRL_PIN(107, "sflash_miso"),
+	PINCTRL_PIN(108, "sflash_wp_n"),
+	PINCTRL_PIN(109, "sflash_hold_n"),
+	PINCTRL_PIN(110, "nand_ale"),
+	PINCTRL_PIN(111, "nand_ce0_l"),
+	PINCTRL_PIN(112, "nand_ce1_l"),
+	PINCTRL_PIN(113, "nand_cle"),
+	PINCTRL_PIN(114, "nand_dq0"),
+	PINCTRL_PIN(115, "nand_dq1"),
+	PINCTRL_PIN(116, "nand_dq2"),
+	PINCTRL_PIN(117, "nand_dq3"),
+	PINCTRL_PIN(118, "nand_dq4"),
+	PINCTRL_PIN(119, "nand_dq5"),
+	PINCTRL_PIN(120, "nand_dq6"),
+	PINCTRL_PIN(121, "nand_dq7"),
+	PINCTRL_PIN(122, "nand_rb_l"),
+	PINCTRL_PIN(123, "nand_re_l"),
+	PINCTRL_PIN(124, "nand_we_l"),
+	PINCTRL_PIN(125, "nand_wp_l"),
+	PINCTRL_PIN(126, "lcd_clac"),
+	PINCTRL_PIN(127, "lcd_clcp"),
+	PINCTRL_PIN(128, "lcd_cld0"),
+	PINCTRL_PIN(129, "lcd_cld1"),
+	PINCTRL_PIN(130, "lcd_cld10"),
+	PINCTRL_PIN(131, "lcd_cld11"),
+	PINCTRL_PIN(132, "lcd_cld12"),
+	PINCTRL_PIN(133, "lcd_cld13"),
+	PINCTRL_PIN(134, "lcd_cld14"),
+	PINCTRL_PIN(135, "lcd_cld15"),
+	PINCTRL_PIN(136, "lcd_cld16"),
+	PINCTRL_PIN(137, "lcd_cld17"),
+	PINCTRL_PIN(138, "lcd_cld18"),
+	PINCTRL_PIN(139, "lcd_cld19"),
+	PINCTRL_PIN(140, "lcd_cld2"),
+	PINCTRL_PIN(141, "lcd_cld20"),
+	PINCTRL_PIN(142, "lcd_cld21"),
+	PINCTRL_PIN(143, "lcd_cld22"),
+	PINCTRL_PIN(144, "lcd_cld23"),
+	PINCTRL_PIN(145, "lcd_cld3"),
+	PINCTRL_PIN(146, "lcd_cld4"),
+	PINCTRL_PIN(147, "lcd_cld5"),
+	PINCTRL_PIN(148, "lcd_cld6"),
+	PINCTRL_PIN(149, "lcd_cld7"),
+	PINCTRL_PIN(150, "lcd_cld8"),
+	PINCTRL_PIN(151, "lcd_cld9"),
+	PINCTRL_PIN(152, "lcd_clfp"),
+	PINCTRL_PIN(153, "lcd_clle"),
+	PINCTRL_PIN(154, "lcd_cllp"),
+	PINCTRL_PIN(155, "lcd_clpower"),
+	PINCTRL_PIN(156, "camera_vsync"),
+	PINCTRL_PIN(157, "camera_trigger"),
+	PINCTRL_PIN(158, "camera_strobe"),
+	PINCTRL_PIN(159, "camera_standby"),
+	PINCTRL_PIN(160, "camera_reset_n"),
+	PINCTRL_PIN(161, "camera_pixdata9"),
+	PINCTRL_PIN(162, "camera_pixdata8"),
+	PINCTRL_PIN(163, "camera_pixdata7"),
+	PINCTRL_PIN(164, "camera_pixdata6"),
+	PINCTRL_PIN(165, "camera_pixdata5"),
+	PINCTRL_PIN(166, "camera_pixdata4"),
+	PINCTRL_PIN(167, "camera_pixdata3"),
+	PINCTRL_PIN(168, "camera_pixdata2"),
+	PINCTRL_PIN(169, "camera_pixdata1"),
+	PINCTRL_PIN(170, "camera_pixdata0"),
+	PINCTRL_PIN(171, "camera_pixclk"),
+	PINCTRL_PIN(172, "camera_hsync"),
+	PINCTRL_PIN(173, "camera_pll_ref_clk"),
+	PINCTRL_PIN(174, "usb_id_indication"),
+	PINCTRL_PIN(175, "usb_vbus_indication"),
+	PINCTRL_PIN(176, "gpio0_3p3"),
+	PINCTRL_PIN(177, "gpio1_3p3"),
+	PINCTRL_PIN(178, "gpio2_3p3"),
+	PINCTRL_PIN(179, "gpio3_3p3"),
+};
+
+/*
+ * List of groups of pins
+ */
+static const unsigned gpio0_pins[] = { 12 };
+static const unsigned gpio1_pins[] = { 13 };
+static const unsigned gpio2_pins[] = { 14 };
+static const unsigned gpio3_pins[] = { 15 };
+static const unsigned gpio4_pins[] = { 16 };
+static const unsigned gpio5_pins[] = { 17 };
+static const unsigned gpio6_pins[] = { 18 };
+static const unsigned gpio7_pins[] = { 19 };
+static const unsigned gpio8_pins[] = { 20 };
+static const unsigned gpio9_pins[] = { 21 };
+static const unsigned gpio10_pins[] = { 22 };
+static const unsigned gpio11_pins[] = { 23 };
+static const unsigned gpio12_pins[] = { 24 };
+static const unsigned gpio13_pins[] = { 25 };
+static const unsigned gpio14_pins[] = { 26 };
+static const unsigned gpio15_pins[] = { 27 };
+static const unsigned gpio16_pins[] = { 28 };
+static const unsigned gpio17_pins[] = { 29 };
+static const unsigned gpio18_pins[] = { 30 };
+static const unsigned gpio19_pins[] = { 31 };
+static const unsigned gpio20_pins[] = { 32 };
+static const unsigned gpio21_pins[] = { 33 };
+static const unsigned gpio22_pins[] = { 34 };
+static const unsigned gpio23_pins[] = { 35 };
+static const unsigned pwm0_pins[] = { 38 };
+static const unsigned pwm1_pins[] = { 39 };
+static const unsigned pwm2_pins[] = { 40 };
+static const unsigned pwm3_pins[] = { 41 };
+static const unsigned sdio0_pins[] = { 94, 95, 96, 97, 98, 99 };
+static const unsigned smart_card0_pins[] = { 42, 43, 44, 46, 47 };
+static const unsigned smart_card1_pins[] = { 48, 49, 50, 52, 53 };
+static const unsigned spi0_pins[] = { 54, 55, 56, 57 };
+static const unsigned spi1_pins[] = { 58, 59, 60, 61 };
+static const unsigned spi2_pins[] = { 62, 63, 64, 65 };
+static const unsigned spi3_pins[] = { 66, 67, 68, 69 };
+static const unsigned d1w_pins[] = { 10, 11 };
+static const unsigned lcd_pins[] = { 126, 127, 128, 129, 130, 131, 132,	133,
+	134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147,
+	148, 149, 150, 151, 152, 153, 154, 155 };
+static const unsigned uart0_pins[] = { 70, 71, 72, 73 };
+static const unsigned uart1_dte_pins[] = { 75, 76, 77, 78 };
+static const unsigned uart1_pins[] = { 74, 79, 80, 81 };
+static const unsigned uart3_pins[] = { 82, 83 };
+static const unsigned qspi_pins[] = { 104, 105, 106, 107 };
+static const unsigned nand_pins[] = { 110, 111, 112, 113, 114, 115, 116, 117,
+	118, 119, 120, 121, 122, 123, 124, 125 };
+static const unsigned sdio0_cd_pins[] = { 103 };
+static const unsigned sdio0_mmc_pins[] = { 100, 101, 102 };
+static const unsigned can0_spi4_pins[] = { 86, 87 };
+static const unsigned can1_spi4_pins[] = { 88, 89 };
+static const unsigned sdio1_cd_pins[] = { 93 };
+static const unsigned sdio1_led_pins[] = { 84, 85 };
+static const unsigned sdio1_mmc_pins[] = { 90, 91, 92 };
+static const unsigned camera_led_pins[] = { 156, 157, 158, 159, 160 };
+static const unsigned camera_rgmii_pins[] = { 169, 170, 171, 169, 170, 171,
+	172, 173 };
+static const unsigned camera_sram_rgmii_pins[] = { 161, 162, 163, 164, 165,
+	166, 167, 168 };
+static const unsigned qspi_gpio_pins[] = { 108, 109 };
+static const unsigned smart_card0_fcb_pins[] = { 45 };
+static const unsigned smart_card1_fcb_pins[] = { 51 };
+static const unsigned gpio0_3p3_pins[] = { 176 };
+static const unsigned gpio1_3p3_pins[] = { 177 };
+static const unsigned gpio2_3p3_pins[] = { 178 };
+
+/*
+ * List of groups names. Need to match the order in cygnus_pin_groups
+ */
+static const char * const cygnus_pin_group_names[] = {
+	"gpio0",
+	"gpio1",
+	"gpio2",
+	"gpio3",
+	"gpio4",
+	"gpio5",
+	"gpio6",
+	"gpio7",
+	"gpio8",
+	"gpio9",
+	"gpio10",
+	"gpio11",
+	"gpio12",
+	"gpio13",
+	"gpio14",
+	"gpio15",
+	"gpio16",
+	"gpio17",
+	"gpio18",
+	"gpio19",
+	"gpio20",
+	"gpio21",
+	"gpio22",
+	"gpio23",
+	"pwm0",
+	"pwm1",
+	"pwm2",
+	"pwm3",
+	"sdio0",
+	"smart_card0",
+	"smart_card1",
+	"spi0",
+	"spi1",
+	"spi2",
+	"spi3",
+	"d1w",
+	"lcd",
+	"uart0",
+	"uart1_dte",
+	"uart1",
+	"uart3",
+	"qspi",
+	"nand",
+	"sdio0_cd",
+	"sdio0_mmc",
+	"can0_spi4",
+	"can1_spi4",
+	"sdio1_cd",
+	"sdio1_led",
+	"sdio1_mmc",
+	"camera_led",
+	"camera_rgmii",
+	"camera_sram_rgmii",
+	"qspi_gpio",
+	"smart_card0_fcb",
+	"smart_card1_fcb",
+	"gpio0_3p3",
+	"gpio1_3p3",
+	"gpio2_3p3",
+};
+
+/*
+ * List of groups. Need to match the order in cygnus_pin_group_names
+ */
+static const struct cygnus_pin_group cygnus_pin_groups[] = {
+	CYGNUS_PIN_GROUP(gpio0, 0x0, 0),
+	CYGNUS_PIN_GROUP(gpio1, 0x0, 4),
+	CYGNUS_PIN_GROUP(gpio2, 0x0, 8),
+	CYGNUS_PIN_GROUP(gpio3, 0x0, 12),
+	CYGNUS_PIN_GROUP(gpio4, 0x0, 16),
+	CYGNUS_PIN_GROUP(gpio5, 0x0, 20),
+	CYGNUS_PIN_GROUP(gpio6, 0x0, 24),
+	CYGNUS_PIN_GROUP(gpio7, 0x0, 28),
+	CYGNUS_PIN_GROUP(gpio8, 0x4, 0),
+	CYGNUS_PIN_GROUP(gpio9, 0x4, 4),
+	CYGNUS_PIN_GROUP(gpio10, 0x4, 8),
+	CYGNUS_PIN_GROUP(gpio11, 0x4, 12),
+	CYGNUS_PIN_GROUP(gpio12, 0x4, 16),
+	CYGNUS_PIN_GROUP(gpio13, 0x4, 20),
+	CYGNUS_PIN_GROUP(gpio14, 0x4, 24),
+	CYGNUS_PIN_GROUP(gpio15, 0x4, 28),
+	CYGNUS_PIN_GROUP(gpio16, 0x8, 0),
+	CYGNUS_PIN_GROUP(gpio17, 0x8, 4),
+	CYGNUS_PIN_GROUP(gpio18, 0x8, 8),
+	CYGNUS_PIN_GROUP(gpio19, 0x8, 12),
+	CYGNUS_PIN_GROUP(gpio20, 0x8, 16),
+	CYGNUS_PIN_GROUP(gpio21, 0x8, 20),
+	CYGNUS_PIN_GROUP(gpio22, 0x8, 24),
+	CYGNUS_PIN_GROUP(gpio23, 0x8, 28),
+	CYGNUS_PIN_GROUP(pwm0, 0xc, 0),
+	CYGNUS_PIN_GROUP(pwm1, 0xc, 4),
+	CYGNUS_PIN_GROUP(pwm2, 0xc, 8),
+	CYGNUS_PIN_GROUP(pwm3, 0xc, 12),
+	CYGNUS_PIN_GROUP(sdio0, 0xc, 16),
+	CYGNUS_PIN_GROUP(smart_card0, 0xc, 20),
+	CYGNUS_PIN_GROUP(smart_card1, 0xc, 24),
+	CYGNUS_PIN_GROUP(spi0, 0x10, 0),
+	CYGNUS_PIN_GROUP(spi1, 0x10, 4),
+	CYGNUS_PIN_GROUP(spi2, 0x10, 8),
+	CYGNUS_PIN_GROUP(spi3, 0x10, 12),
+	CYGNUS_PIN_GROUP(d1w, 0x10, 16),
+	CYGNUS_PIN_GROUP(lcd, 0x10, 20),
+	CYGNUS_PIN_GROUP(uart0, 0x14, 0),
+	CYGNUS_PIN_GROUP(uart1_dte, 0x14, 4),
+	CYGNUS_PIN_GROUP(uart1, 0x14, 8),
+	CYGNUS_PIN_GROUP(uart3, 0x14, 12),
+	CYGNUS_PIN_GROUP(qspi, 0x14, 16),
+	CYGNUS_PIN_GROUP(nand, 0x14, 20),
+	CYGNUS_PIN_GROUP(sdio0_cd, 0x18, 0),
+	CYGNUS_PIN_GROUP(sdio0_mmc, 0x18, 4),
+	CYGNUS_PIN_GROUP(can0_spi4, 0x18, 8),
+	CYGNUS_PIN_GROUP(can1_spi4, 0x18, 12),
+	CYGNUS_PIN_GROUP(sdio1_cd, 0x18, 16),
+	CYGNUS_PIN_GROUP(sdio1_led, 0x18, 20),
+	CYGNUS_PIN_GROUP(sdio1_mmc, 0x18, 24),
+	CYGNUS_PIN_GROUP(camera_led, 0x1c, 0),
+	CYGNUS_PIN_GROUP(camera_rgmii, 0x1c, 4),
+	CYGNUS_PIN_GROUP(camera_sram_rgmii, 0x1c, 8),
+	CYGNUS_PIN_GROUP(qspi_gpio, 0x1c, 12),
+	CYGNUS_PIN_GROUP(smart_card0_fcb, 0x20, 0),
+	CYGNUS_PIN_GROUP(smart_card1_fcb, 0x20, 4),
+	CYGNUS_PIN_GROUP(gpio0_3p3, 0x28, 0),
+	CYGNUS_PIN_GROUP(gpio1_3p3, 0x28, 4),
+	CYGNUS_PIN_GROUP(gpio2_3p3, 0x28, 8),
+};
+
+#define CYGNUS_PIN_FUNCTION(fcn_name, mux_val)			\
+{								\
+	.name = #fcn_name,					\
+	.group_names = cygnus_pin_group_names,			\
+	.num_groups = ARRAY_SIZE(cygnus_pin_group_names),	\
+	.mux = mux_val,						\
+}
+
+/*
+ * Cygnus has 4 alternate functions. All groups can be configured to any of
+ * the 4 alternate functions
+ */
+static const struct cygnus_pin_function cygnus_pin_functions[] = {
+	CYGNUS_PIN_FUNCTION(alt1, 0),
+	CYGNUS_PIN_FUNCTION(alt2, 1),
+	CYGNUS_PIN_FUNCTION(alt3, 2),
+	CYGNUS_PIN_FUNCTION(alt4, 3),
+};
+
+static int cygnus_get_groups_count(struct pinctrl_dev *pctrl_dev)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->num_groups;
+}
+
+static const char *cygnus_get_group_name(struct pinctrl_dev *pctrl_dev,
+		unsigned selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->groups[selector].name;
+}
+
+static int cygnus_get_group_pins(struct pinctrl_dev *pctrl_dev,
+		unsigned selector, const unsigned **pins,
+		unsigned *num_pins)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	*pins = pinctrl->groups[selector].pins;
+	*num_pins = pinctrl->groups[selector].num_pins;
+
+	return 0;
+}
+
+static void cygnus_pin_dbg_show(struct pinctrl_dev *pctrl_dev,
+		struct seq_file *s, unsigned offset)
+{
+	seq_printf(s, " %s", dev_name(pctrl_dev->dev));
+}
+
+static int find_matched_function(const char *function_name)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(cygnus_pin_functions); i++) {
+		if (!strcmp(cygnus_pin_functions[i].name, function_name))
+			return (int)cygnus_pin_functions[i].mux;
+	}
+
+	return -EINVAL;
+}
+
+static int cygnus_dt_node_to_map(struct pinctrl_dev *pctrl_dev,
+		struct device_node *np, struct pinctrl_map **map,
+		unsigned *num_maps)
+{
+	int ret, num_groups;
+	unsigned reserved_maps = 0;
+	struct property *prop;
+	const char *group_name, *function_name;
+
+	*map = NULL;
+	*num_maps = 0;
+
+	num_groups = of_property_count_strings(np, "brcm,groups");
+	if (num_groups < 0) {
+		dev_err(pctrl_dev->dev,
+			"could not parse property brcm,groups\n");
+		return -EINVAL;
+	}
+
+	ret = of_property_read_string(np, "brcm,function", &function_name);
+	if (ret < 0) {
+		dev_err(pctrl_dev->dev,
+			"could not parse property brcm,function\n");
+		return -EINVAL;
+	}
+
+	/* make sure it's a valid alternate function */
+	ret = find_matched_function(function_name);
+	if (ret < 0) {
+		dev_err(pctrl_dev->dev, "invalid function name: %s\n",
+				function_name);
+	}
+
+	ret = pinctrl_utils_reserve_map(pctrl_dev, map, &reserved_maps,
+			num_maps, num_groups);
+	if (ret) {
+		dev_err(pctrl_dev->dev, "unable to reserve map\n");
+		return ret;
+	}
+
+	of_property_for_each_string(np, "brcm,groups", prop, group_name) {
+		ret = pinctrl_utils_add_map_mux(pctrl_dev, map,
+				&reserved_maps, num_maps, group_name,
+				function_name);
+		if (ret) {
+			dev_err(pctrl_dev->dev, "can't add map: %d\n", ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static struct pinctrl_ops cygnus_pinctrl_ops = {
+	.get_groups_count = cygnus_get_groups_count,
+	.get_group_name = cygnus_get_group_name,
+	.get_group_pins = cygnus_get_group_pins,
+	.pin_dbg_show = cygnus_pin_dbg_show,
+	.dt_node_to_map = cygnus_dt_node_to_map,
+	.dt_free_map = pinctrl_utils_dt_free_map,
+};
+
+static int cygnus_get_functions_count(struct pinctrl_dev *pctrl_dev)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->num_functions;
+}
+
+static const char *cygnus_get_function_name(struct pinctrl_dev *pctrl_dev,
+		unsigned selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->functions[selector].name;
+}
+
+static int cygnus_get_function_groups(struct pinctrl_dev *pctrl_dev,
+	unsigned selector, const char * const **groups,
+	unsigned * const num_groups)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	*groups = pinctrl->functions[selector].group_names;
+	*num_groups = pinctrl->functions[selector].num_groups;
+
+	return 0;
+}
+
+static int cygnus_pinmux_set_mux(struct pinctrl_dev *pctrl_dev,
+		unsigned function_selector, unsigned group_selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+	const struct cygnus_pin_function *function =
+			&pinctrl->functions[function_selector];
+	const struct cygnus_pin_group *group =
+			&pinctrl->groups[group_selector];
+	u32 val, mask = 0x7;
+
+	dev_dbg(pctrl_dev->dev,
+	"group:%s with offset:0x%08x shift:%u set to function: %s mux:%u\n",
+		group->name, group->offset, group->shift, function->name,
+		function->mux);
+
+	val = readl(pinctrl->base + group->offset);
+	val &= ~(mask << group->shift);
+	val |= function->mux << group->shift;
+	writel(val, pinctrl->base + group->offset);
+
+	return 0;
+}
+
+static struct pinmux_ops cygnus_pinmux_ops = {
+	.get_functions_count = cygnus_get_functions_count,
+	.get_function_name = cygnus_get_function_name,
+	.get_function_groups = cygnus_get_function_groups,
+	.set_mux = cygnus_pinmux_set_mux,
+};
+
+static struct pinctrl_desc cygnus_pinctrl_desc = {
+	.pctlops = &cygnus_pinctrl_ops,
+	.pmxops = &cygnus_pinmux_ops,
+	.owner = THIS_MODULE,
+};
+
+static int cygnus_pinctrl_probe(struct platform_device *pdev)
+{
+	struct cygnus_pinctrl *pinctrl;
+	struct resource *res;
+
+	pinctrl = devm_kzalloc(&pdev->dev, sizeof(*pinctrl), GFP_KERNEL);
+	if (!pinctrl) {
+		dev_err(&pdev->dev, "unable to allocate memory\n");
+		return -ENOMEM;
+	}
+	pinctrl->dev = &pdev->dev;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "unable to get resource\n");
+		return -ENOENT;
+	}
+
+	pinctrl->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(pinctrl->base)) {
+		dev_err(&pdev->dev, "unable to map I/O space\n");
+		return PTR_ERR(pinctrl->base);
+	}
+
+	pinctrl->pins = cygnus_pinctrl_pins;
+	pinctrl->num_pins = ARRAY_SIZE(cygnus_pinctrl_pins);
+	pinctrl->groups = cygnus_pin_groups;
+	pinctrl->num_groups = ARRAY_SIZE(cygnus_pin_groups);
+	pinctrl->functions = cygnus_pin_functions;
+	pinctrl->num_functions = ARRAY_SIZE(cygnus_pin_functions);
+
+	cygnus_pinctrl_desc.name = dev_name(&pdev->dev);
+	cygnus_pinctrl_desc.pins = cygnus_pinctrl_pins;
+	cygnus_pinctrl_desc.npins = ARRAY_SIZE(cygnus_pinctrl_pins);
+
+	pinctrl->pctl = pinctrl_register(&cygnus_pinctrl_desc, &pdev->dev,
+			pinctrl);
+	if (!pinctrl->pctl) {
+		dev_err(&pdev->dev, "unable to register cygnus pinctrl\n");
+		return -EINVAL;
+	}
+
+	platform_set_drvdata(pdev, pinctrl);
+
+	return 0;
+}
+
+static int cygnus_pinctrl_remove(struct platform_device *pdev)
+{
+	struct cygnus_pinctrl *pinctrl = platform_get_drvdata(pdev);
+
+	pinctrl_unregister(pinctrl->pctl);
+	platform_set_drvdata(pdev, NULL);
+
+	return 0;
+}
+
+static struct of_device_id cygnus_pinctrl_of_match[] = {
+	{ .compatible = "brcm,cygnus-pinctrl", },
+	{ },
+};
+
+static struct platform_driver cygnus_pinctrl_driver = {
+	.driver = {
+		.name = "cygnus-pinctrl",
+		.owner = THIS_MODULE,
+		.of_match_table = cygnus_pinctrl_of_match,
+	},
+	.probe = cygnus_pinctrl_probe,
+	.remove = cygnus_pinctrl_remove,
+};
+
+static int __init cygnus_pinctrl_init(void)
+{
+	return platform_driver_register(&cygnus_pinctrl_driver);
+}
+arch_initcall(cygnus_pinctrl_init);
+
+static void __exit cygnus_pinctrl_exit(void)
+{
+	platform_driver_unregister(&cygnus_pinctrl_driver);
+}
+module_exit(cygnus_pinctrl_exit);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus pinctrl driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH 3/4] ARM: mach-bcm: enable pinctrl support for Cygnus

[Ray Jui]

This enables the pinctrl driver for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 arch/arm/mach-bcm/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index aaeec78..b4efff2 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -29,6 +29,7 @@ config ARCH_BCM_IPROC
 config ARCH_BCM_CYGNUS
 	bool "Broadcom Cygnus Support" if ARCH_MULTI_V7
 	select ARCH_BCM_IPROC
+	select PINCTRL_BCM_CYGNUS
 	help
 	  Enable support for the Cygnus family,
 	  which includes the following variants:
-- 
1.7.9.5

[PATCH 3/4] ARM: mach-bcm: enable pinctrl support for Cygnus

[Ray Jui]

This enables the pinctrl driver for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 arch/arm/mach-bcm/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index aaeec78..b4efff2 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -29,6 +29,7 @@ config ARCH_BCM_IPROC
 config ARCH_BCM_CYGNUS
 	bool "Broadcom Cygnus Support" if ARCH_MULTI_V7
 	select ARCH_BCM_IPROC
+	select PINCTRL_BCM_CYGNUS
 	help
 	  Enable support for the Cygnus family,
 	  which includes the following variants:
-- 
1.7.9.5

[PATCH 3/4] ARM: mach-bcm: enable pinctrl support for Cygnus

[Ray Jui]

This enables the pinctrl driver for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 arch/arm/mach-bcm/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index aaeec78..b4efff2 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -29,6 +29,7 @@ config ARCH_BCM_IPROC
 config ARCH_BCM_CYGNUS
 	bool "Broadcom Cygnus Support" if ARCH_MULTI_V7
 	select ARCH_BCM_IPROC
+	select PINCTRL_BCM_CYGNUS
 	help
 	  Enable support for the Cygnus family,
 	  which includes the following variants:
-- 
1.7.9.5

[PATCH 4/4] ARM: dts: enable pinctrl for Broadcom Cygnus

[Ray Jui]

This enables the pinctrl support for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..4c6bf4d 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -54,6 +54,11 @@
 
 	/include/ "bcm-cygnus-clock.dtsi"
 
+	pinctrl: pinctrl@0x0301d0c8 {
+		compatible = "brcm,cygnus-pinctrl";
+		reg = <0x0301d0c8 0x2c>;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

[PATCH 4/4] ARM: dts: enable pinctrl for Broadcom Cygnus

[Ray Jui]

This enables the pinctrl support for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..4c6bf4d 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -54,6 +54,11 @@
 
 	/include/ "bcm-cygnus-clock.dtsi"
 
+	pinctrl: pinctrl@0x0301d0c8 {
+		compatible = "brcm,cygnus-pinctrl";
+		reg = <0x0301d0c8 0x2c>;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

[PATCH 4/4] ARM: dts: enable pinctrl for Broadcom Cygnus

[Ray Jui]

This enables the pinctrl support for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..4c6bf4d 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -54,6 +54,11 @@
 
 	/include/ "bcm-cygnus-clock.dtsi"
 
+	pinctrl: pinctrl at 0x0301d0c8 {
+		compatible = "brcm,cygnus-pinctrl";
+		reg = <0x0301d0c8 0x2c>;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

Re: [PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Belisko Marek]

On Thu, Dec 4, 2014 at 10:56 PM, Ray Jui <rjui@broadcom.com> wrote:
> Device tree binding documentation for Broadcom Cygnus pinctrl driver
>
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> ---
>  .../bindings/pinctrl/brcm,cygnus-pinctrl.txt       |   92 ++++++++++++++++++++
>  1 file changed, 92 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
>
> diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
> new file mode 100644
> index 0000000..86e4579
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
> @@ -0,0 +1,92 @@
> +Broadcom Cygnus Pin Controller
> +
> +The Cygnus pin controller supports setting the alternate functions of groups
> +of pins. Pinmux configuration on individual pins is not supported by the
> +Cygnus A0 SoC.
> +
> +Required properties:
> +
> +- compatible:
> +    Must be "brcm,cygnus-pinctrl"
> +
> +- reg:
> +    Define the base and range of the I/O address space that contain the Cygnus
> +pin control registers
> +
> +- brcm,groups:
> +    This can be strings of one or more group names. This defines the group(s)
> +that one wants to configure
> +
> +- brcm,function:
> +    This is the alternate function that one wants to configure to. Valid
> +alternate functions are "alt1", "alt2", "alt3", "alt4"
> +
> +Each child node represents a configuration. Client devices reference the the
> +child node to enable the mux configuration.
> +
> +For example:
> +
> +       pinctrl: pinctrl@0x0301d0c8 {
> +               compatible = "brcm,cygnus-pinctrl";
> +               reg = <0x0301d0c8 0x2c>;
> +
> +               i2s_0: i2s_0 {
> +                       brcm,groups = "smart_card0", "smart_card0_fcb";
> +                       brcm,function = "alt2";
> +               };
> +
> +               i2s_1: i2s_1 {
> +                       brcm,groups = "smart_card1", "smart_card1_fcb";
> +                       brcm,function = "alt2";
> +               };
> +
> +               spi_0: spi_0 {
> +                       brcm,groups = "spi0";
> +                       brcm,function = "alt1";
> +               };
> +       }
> +
> +       spi0@18028000 {
> +                       compatible = "arm,pl022", "arm,primecell";
> +                       reg = <0x18028000 0x1000>;
> +                       #address-cells = <1>;
> +                       #size-cells = <0>;
> +                       interrupts = <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>;
> +                       pinctrl-0 = <&spi_0>;
> +                       clocks = <&axi81_clk>;
> +                       clock-names = "apb_pclk";
> +       };
> +
> +Consider the following snapshot of Cygnus pinmux table:
> +
> +number    pin            group              alt1             alt2        alt3        alt4
> +------    ---            ----               ----             ----        ----        ----
> +42        sc0_clk        smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio24
> +43        sc0_cmdvcc_l   smart_card0        SMART CARD0      I2S_0       N/A         STRAP
> +44        sc0_detect     smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio25
> +45        sc0_fcb        smart_card0_fcb    SMART CARD0_FCB  I2S_0       N/A         chip_gpio26
> +46        sc0_io         smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio27
> +47        sc0_rst_l      smart_card0        SMART CARD0      SPDIF       N/A         STRAP
> +
> +Note due to limitation of the Cygnus hardware, pinmux configuration can only
> +be group based. To enable I2S_0 function, one needs the following child node
> +configuration:
> +
> +       i2s_0: i2s_0 {
> +               brcm,groups = "smart_card0", "smart_card0_fcb";
> +               brcm,function = "alt2";
> +       };
> +
> +This tells the Cygnus pin controller to configure groups "smart_card0" and
> +"smart_card0_fcb" to I2S_0. With this configuration, pins 42, 43, 44, 45, 46
> +become I2C_0, and pin 47 becomes SPDIF
                  ^^^^ typo - should be I2S_0
> +
> +Consider another example, that one wants to configure the above pins as GPIO:
> +
> +       gpio_24_27: gpio_24_27 {
> +               brcm,groups = "smart_card0", "smart_card0_fcb";
> +               brcm,function = "alt4";
> +       };
> +
> +With the above configuration, pins 42, 44, 45, 46 become GPIO, and 43 and 47
> +become reserved for STRAP
> --
> 1.7.9.5
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

BR,

marek

-- 
as simple and primitive as possible
-------------------------------------------------
Marek Belisko - OPEN-NANDRA
Freelance Developer

Ruska Nova Ves 219 | Presov, 08005 Slovak Republic
Tel: +421 915 052 184
skype: marekwhite
twitter: #opennandra
web: http://open-nandra.com

[PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Belisko Marek]

On Thu, Dec 4, 2014 at 10:56 PM, Ray Jui <rjui@broadcom.com> wrote:
> Device tree binding documentation for Broadcom Cygnus pinctrl driver
>
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> ---
>  .../bindings/pinctrl/brcm,cygnus-pinctrl.txt       |   92 ++++++++++++++++++++
>  1 file changed, 92 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
>
> diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
> new file mode 100644
> index 0000000..86e4579
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
> @@ -0,0 +1,92 @@
> +Broadcom Cygnus Pin Controller
> +
> +The Cygnus pin controller supports setting the alternate functions of groups
> +of pins. Pinmux configuration on individual pins is not supported by the
> +Cygnus A0 SoC.
> +
> +Required properties:
> +
> +- compatible:
> +    Must be "brcm,cygnus-pinctrl"
> +
> +- reg:
> +    Define the base and range of the I/O address space that contain the Cygnus
> +pin control registers
> +
> +- brcm,groups:
> +    This can be strings of one or more group names. This defines the group(s)
> +that one wants to configure
> +
> +- brcm,function:
> +    This is the alternate function that one wants to configure to. Valid
> +alternate functions are "alt1", "alt2", "alt3", "alt4"
> +
> +Each child node represents a configuration. Client devices reference the the
> +child node to enable the mux configuration.
> +
> +For example:
> +
> +       pinctrl: pinctrl at 0x0301d0c8 {
> +               compatible = "brcm,cygnus-pinctrl";
> +               reg = <0x0301d0c8 0x2c>;
> +
> +               i2s_0: i2s_0 {
> +                       brcm,groups = "smart_card0", "smart_card0_fcb";
> +                       brcm,function = "alt2";
> +               };
> +
> +               i2s_1: i2s_1 {
> +                       brcm,groups = "smart_card1", "smart_card1_fcb";
> +                       brcm,function = "alt2";
> +               };
> +
> +               spi_0: spi_0 {
> +                       brcm,groups = "spi0";
> +                       brcm,function = "alt1";
> +               };
> +       }
> +
> +       spi0 at 18028000 {
> +                       compatible = "arm,pl022", "arm,primecell";
> +                       reg = <0x18028000 0x1000>;
> +                       #address-cells = <1>;
> +                       #size-cells = <0>;
> +                       interrupts = <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>;
> +                       pinctrl-0 = <&spi_0>;
> +                       clocks = <&axi81_clk>;
> +                       clock-names = "apb_pclk";
> +       };
> +
> +Consider the following snapshot of Cygnus pinmux table:
> +
> +number    pin            group              alt1             alt2        alt3        alt4
> +------    ---            ----               ----             ----        ----        ----
> +42        sc0_clk        smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio24
> +43        sc0_cmdvcc_l   smart_card0        SMART CARD0      I2S_0       N/A         STRAP
> +44        sc0_detect     smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio25
> +45        sc0_fcb        smart_card0_fcb    SMART CARD0_FCB  I2S_0       N/A         chip_gpio26
> +46        sc0_io         smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio27
> +47        sc0_rst_l      smart_card0        SMART CARD0      SPDIF       N/A         STRAP
> +
> +Note due to limitation of the Cygnus hardware, pinmux configuration can only
> +be group based. To enable I2S_0 function, one needs the following child node
> +configuration:
> +
> +       i2s_0: i2s_0 {
> +               brcm,groups = "smart_card0", "smart_card0_fcb";
> +               brcm,function = "alt2";
> +       };
> +
> +This tells the Cygnus pin controller to configure groups "smart_card0" and
> +"smart_card0_fcb" to I2S_0. With this configuration, pins 42, 43, 44, 45, 46
> +become I2C_0, and pin 47 becomes SPDIF
                  ^^^^ typo - should be I2S_0
> +
> +Consider another example, that one wants to configure the above pins as GPIO:
> +
> +       gpio_24_27: gpio_24_27 {
> +               brcm,groups = "smart_card0", "smart_card0_fcb";
> +               brcm,function = "alt4";
> +       };
> +
> +With the above configuration, pins 42, 44, 45, 46 become GPIO, and 43 and 47
> +become reserved for STRAP
> --
> 1.7.9.5
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel at lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

BR,

marek

-- 
as simple and primitive as possible
-------------------------------------------------
Marek Belisko - OPEN-NANDRA
Freelance Developer

Ruska Nova Ves 219 | Presov, 08005 Slovak Republic
Tel: +421 915 052 184
skype: marekwhite
twitter: #opennandra
web: http://open-nandra.com

Re: [PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Ray Jui]

On 12/4/2014 2:16 PM, Belisko Marek wrote:
> On Thu, Dec 4, 2014 at 10:56 PM, Ray Jui <rjui@broadcom.com> wrote:
>> Device tree binding documentation for Broadcom Cygnus pinctrl driver
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>> ---
>>   .../bindings/pinctrl/brcm,cygnus-pinctrl.txt       |   92 ++++++++++++++++++++
>>   1 file changed, 92 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
>>
>> diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
>> new file mode 100644
>> index 0000000..86e4579
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
>> @@ -0,0 +1,92 @@
>> +Broadcom Cygnus Pin Controller
>> +
>> +The Cygnus pin controller supports setting the alternate functions of groups
>> +of pins. Pinmux configuration on individual pins is not supported by the
>> +Cygnus A0 SoC.
>> +
>> +Required properties:
>> +
>> +- compatible:
>> +    Must be "brcm,cygnus-pinctrl"
>> +
>> +- reg:
>> +    Define the base and range of the I/O address space that contain the Cygnus
>> +pin control registers
>> +
>> +- brcm,groups:
>> +    This can be strings of one or more group names. This defines the group(s)
>> +that one wants to configure
>> +
>> +- brcm,function:
>> +    This is the alternate function that one wants to configure to. Valid
>> +alternate functions are "alt1", "alt2", "alt3", "alt4"
>> +
>> +Each child node represents a configuration. Client devices reference the the
>> +child node to enable the mux configuration.
>> +
>> +For example:
>> +
>> +       pinctrl: pinctrl@0x0301d0c8 {
>> +               compatible = "brcm,cygnus-pinctrl";
>> +               reg = <0x0301d0c8 0x2c>;
>> +
>> +               i2s_0: i2s_0 {
>> +                       brcm,groups = "smart_card0", "smart_card0_fcb";
>> +                       brcm,function = "alt2";
>> +               };
>> +
>> +               i2s_1: i2s_1 {
>> +                       brcm,groups = "smart_card1", "smart_card1_fcb";
>> +                       brcm,function = "alt2";
>> +               };
>> +
>> +               spi_0: spi_0 {
>> +                       brcm,groups = "spi0";
>> +                       brcm,function = "alt1";
>> +               };
>> +       }
>> +
>> +       spi0@18028000 {
>> +                       compatible = "arm,pl022", "arm,primecell";
>> +                       reg = <0x18028000 0x1000>;
>> +                       #address-cells = <1>;
>> +                       #size-cells = <0>;
>> +                       interrupts = <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>;
>> +                       pinctrl-0 = <&spi_0>;
>> +                       clocks = <&axi81_clk>;
>> +                       clock-names = "apb_pclk";
>> +       };
>> +
>> +Consider the following snapshot of Cygnus pinmux table:
>> +
>> +number    pin            group              alt1             alt2        alt3        alt4
>> +------    ---            ----               ----             ----        ----        ----
>> +42        sc0_clk        smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio24
>> +43        sc0_cmdvcc_l   smart_card0        SMART CARD0      I2S_0       N/A         STRAP
>> +44        sc0_detect     smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio25
>> +45        sc0_fcb        smart_card0_fcb    SMART CARD0_FCB  I2S_0       N/A         chip_gpio26
>> +46        sc0_io         smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio27
>> +47        sc0_rst_l      smart_card0        SMART CARD0      SPDIF       N/A         STRAP
>> +
>> +Note due to limitation of the Cygnus hardware, pinmux configuration can only
>> +be group based. To enable I2S_0 function, one needs the following child node
>> +configuration:
>> +
>> +       i2s_0: i2s_0 {
>> +               brcm,groups = "smart_card0", "smart_card0_fcb";
>> +               brcm,function = "alt2";
>> +       };
>> +
>> +This tells the Cygnus pin controller to configure groups "smart_card0" and
>> +"smart_card0_fcb" to I2S_0. With this configuration, pins 42, 43, 44, 45, 46
>> +become I2C_0, and pin 47 becomes SPDIF
>                    ^^^^ typo - should be I2S_0
Oh yeah. Will change from I2C_0 to I2S_0. Thanks.
>> +
>> +Consider another example, that one wants to configure the above pins as GPIO:
>> +
>> +       gpio_24_27: gpio_24_27 {
>> +               brcm,groups = "smart_card0", "smart_card0_fcb";
>> +               brcm,function = "alt4";
>> +       };
>> +
>> +With the above configuration, pins 42, 44, 45, 46 become GPIO, and 43 and 47
>> +become reserved for STRAP
>> --
>> 1.7.9.5
>>
>>
>> _______________________________________________
>> linux-arm-kernel mailing list
>> linux-arm-kernel@lists.infradead.org
>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>
> BR,
>
> marek
>

Re: [PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Ray Jui]

On 12/4/2014 2:16 PM, Belisko Marek wrote:
> On Thu, Dec 4, 2014 at 10:56 PM, Ray Jui <rjui@broadcom.com> wrote:
>> Device tree binding documentation for Broadcom Cygnus pinctrl driver
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>> ---
>>   .../bindings/pinctrl/brcm,cygnus-pinctrl.txt       |   92 ++++++++++++++++++++
>>   1 file changed, 92 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
>>
>> diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
>> new file mode 100644
>> index 0000000..86e4579
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
>> @@ -0,0 +1,92 @@
>> +Broadcom Cygnus Pin Controller
>> +
>> +The Cygnus pin controller supports setting the alternate functions of groups
>> +of pins. Pinmux configuration on individual pins is not supported by the
>> +Cygnus A0 SoC.
>> +
>> +Required properties:
>> +
>> +- compatible:
>> +    Must be "brcm,cygnus-pinctrl"
>> +
>> +- reg:
>> +    Define the base and range of the I/O address space that contain the Cygnus
>> +pin control registers
>> +
>> +- brcm,groups:
>> +    This can be strings of one or more group names. This defines the group(s)
>> +that one wants to configure
>> +
>> +- brcm,function:
>> +    This is the alternate function that one wants to configure to. Valid
>> +alternate functions are "alt1", "alt2", "alt3", "alt4"
>> +
>> +Each child node represents a configuration. Client devices reference the the
>> +child node to enable the mux configuration.
>> +
>> +For example:
>> +
>> +       pinctrl: pinctrl@0x0301d0c8 {
>> +               compatible = "brcm,cygnus-pinctrl";
>> +               reg = <0x0301d0c8 0x2c>;
>> +
>> +               i2s_0: i2s_0 {
>> +                       brcm,groups = "smart_card0", "smart_card0_fcb";
>> +                       brcm,function = "alt2";
>> +               };
>> +
>> +               i2s_1: i2s_1 {
>> +                       brcm,groups = "smart_card1", "smart_card1_fcb";
>> +                       brcm,function = "alt2";
>> +               };
>> +
>> +               spi_0: spi_0 {
>> +                       brcm,groups = "spi0";
>> +                       brcm,function = "alt1";
>> +               };
>> +       }
>> +
>> +       spi0@18028000 {
>> +                       compatible = "arm,pl022", "arm,primecell";
>> +                       reg = <0x18028000 0x1000>;
>> +                       #address-cells = <1>;
>> +                       #size-cells = <0>;
>> +                       interrupts = <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>;
>> +                       pinctrl-0 = <&spi_0>;
>> +                       clocks = <&axi81_clk>;
>> +                       clock-names = "apb_pclk";
>> +       };
>> +
>> +Consider the following snapshot of Cygnus pinmux table:
>> +
>> +number    pin            group              alt1             alt2        alt3        alt4
>> +------    ---            ----               ----             ----        ----        ----
>> +42        sc0_clk        smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio24
>> +43        sc0_cmdvcc_l   smart_card0        SMART CARD0      I2S_0       N/A         STRAP
>> +44        sc0_detect     smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio25
>> +45        sc0_fcb        smart_card0_fcb    SMART CARD0_FCB  I2S_0       N/A         chip_gpio26
>> +46        sc0_io         smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio27
>> +47        sc0_rst_l      smart_card0        SMART CARD0      SPDIF       N/A         STRAP
>> +
>> +Note due to limitation of the Cygnus hardware, pinmux configuration can only
>> +be group based. To enable I2S_0 function, one needs the following child node
>> +configuration:
>> +
>> +       i2s_0: i2s_0 {
>> +               brcm,groups = "smart_card0", "smart_card0_fcb";
>> +               brcm,function = "alt2";
>> +       };
>> +
>> +This tells the Cygnus pin controller to configure groups "smart_card0" and
>> +"smart_card0_fcb" to I2S_0. With this configuration, pins 42, 43, 44, 45, 46
>> +become I2C_0, and pin 47 becomes SPDIF
>                    ^^^^ typo - should be I2S_0
Oh yeah. Will change from I2C_0 to I2S_0. Thanks.
>> +
>> +Consider another example, that one wants to configure the above pins as GPIO:
>> +
>> +       gpio_24_27: gpio_24_27 {
>> +               brcm,groups = "smart_card0", "smart_card0_fcb";
>> +               brcm,function = "alt4";
>> +       };
>> +
>> +With the above configuration, pins 42, 44, 45, 46 become GPIO, and 43 and 47
>> +become reserved for STRAP
>> --
>> 1.7.9.5
>>
>>
>> _______________________________________________
>> linux-arm-kernel mailing list
>> linux-arm-kernel@lists.infradead.org
>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>
> BR,
>
> marek
>

[PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Ray Jui]

On 12/4/2014 2:16 PM, Belisko Marek wrote:
> On Thu, Dec 4, 2014 at 10:56 PM, Ray Jui <rjui@broadcom.com> wrote:
>> Device tree binding documentation for Broadcom Cygnus pinctrl driver
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>> ---
>>   .../bindings/pinctrl/brcm,cygnus-pinctrl.txt       |   92 ++++++++++++++++++++
>>   1 file changed, 92 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
>>
>> diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
>> new file mode 100644
>> index 0000000..86e4579
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
>> @@ -0,0 +1,92 @@
>> +Broadcom Cygnus Pin Controller
>> +
>> +The Cygnus pin controller supports setting the alternate functions of groups
>> +of pins. Pinmux configuration on individual pins is not supported by the
>> +Cygnus A0 SoC.
>> +
>> +Required properties:
>> +
>> +- compatible:
>> +    Must be "brcm,cygnus-pinctrl"
>> +
>> +- reg:
>> +    Define the base and range of the I/O address space that contain the Cygnus
>> +pin control registers
>> +
>> +- brcm,groups:
>> +    This can be strings of one or more group names. This defines the group(s)
>> +that one wants to configure
>> +
>> +- brcm,function:
>> +    This is the alternate function that one wants to configure to. Valid
>> +alternate functions are "alt1", "alt2", "alt3", "alt4"
>> +
>> +Each child node represents a configuration. Client devices reference the the
>> +child node to enable the mux configuration.
>> +
>> +For example:
>> +
>> +       pinctrl: pinctrl at 0x0301d0c8 {
>> +               compatible = "brcm,cygnus-pinctrl";
>> +               reg = <0x0301d0c8 0x2c>;
>> +
>> +               i2s_0: i2s_0 {
>> +                       brcm,groups = "smart_card0", "smart_card0_fcb";
>> +                       brcm,function = "alt2";
>> +               };
>> +
>> +               i2s_1: i2s_1 {
>> +                       brcm,groups = "smart_card1", "smart_card1_fcb";
>> +                       brcm,function = "alt2";
>> +               };
>> +
>> +               spi_0: spi_0 {
>> +                       brcm,groups = "spi0";
>> +                       brcm,function = "alt1";
>> +               };
>> +       }
>> +
>> +       spi0 at 18028000 {
>> +                       compatible = "arm,pl022", "arm,primecell";
>> +                       reg = <0x18028000 0x1000>;
>> +                       #address-cells = <1>;
>> +                       #size-cells = <0>;
>> +                       interrupts = <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>;
>> +                       pinctrl-0 = <&spi_0>;
>> +                       clocks = <&axi81_clk>;
>> +                       clock-names = "apb_pclk";
>> +       };
>> +
>> +Consider the following snapshot of Cygnus pinmux table:
>> +
>> +number    pin            group              alt1             alt2        alt3        alt4
>> +------    ---            ----               ----             ----        ----        ----
>> +42        sc0_clk        smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio24
>> +43        sc0_cmdvcc_l   smart_card0        SMART CARD0      I2S_0       N/A         STRAP
>> +44        sc0_detect     smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio25
>> +45        sc0_fcb        smart_card0_fcb    SMART CARD0_FCB  I2S_0       N/A         chip_gpio26
>> +46        sc0_io         smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio27
>> +47        sc0_rst_l      smart_card0        SMART CARD0      SPDIF       N/A         STRAP
>> +
>> +Note due to limitation of the Cygnus hardware, pinmux configuration can only
>> +be group based. To enable I2S_0 function, one needs the following child node
>> +configuration:
>> +
>> +       i2s_0: i2s_0 {
>> +               brcm,groups = "smart_card0", "smart_card0_fcb";
>> +               brcm,function = "alt2";
>> +       };
>> +
>> +This tells the Cygnus pin controller to configure groups "smart_card0" and
>> +"smart_card0_fcb" to I2S_0. With this configuration, pins 42, 43, 44, 45, 46
>> +become I2C_0, and pin 47 becomes SPDIF
>                    ^^^^ typo - should be I2S_0
Oh yeah. Will change from I2C_0 to I2S_0. Thanks.
>> +
>> +Consider another example, that one wants to configure the above pins as GPIO:
>> +
>> +       gpio_24_27: gpio_24_27 {
>> +               brcm,groups = "smart_card0", "smart_card0_fcb";
>> +               brcm,function = "alt4";
>> +       };
>> +
>> +With the above configuration, pins 42, 44, 45, 46 become GPIO, and 43 and 47
>> +become reserved for STRAP
>> --
>> 1.7.9.5
>>
>>
>> _______________________________________________
>> linux-arm-kernel mailing list
>> linux-arm-kernel at lists.infradead.org
>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>
> BR,
>
> marek
>

[PATCH v2 0/4] Add pinctrl support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial pinctrl support for the Broadcom Cygnus SoC.
The Cygnus pinctrl controller supports group based alternate function configuration

Changes from v1:
 - Fix a typo in device tree binding document

Ray Jui (4):
  pinctrl: Broadcom Cygnus pinctrl device tree binding
  pinctrl: cygnus: add initial pinctrl support
  ARM: mach-bcm: enable pinctrl support for Cygnus
  ARM: dts: enable pinctrl for Broadcom Cygnus

 .../bindings/pinctrl/brcm,cygnus-pinctrl.txt       |   92 +++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |    5 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/pinctrl/Kconfig                            |    7 +
 drivers/pinctrl/Makefile                           |    1 +
 drivers/pinctrl/pinctrl-bcm-cygnus.c               |  753 ++++++++++++++++++++
 6 files changed, 859 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
 create mode 100644 drivers/pinctrl/pinctrl-bcm-cygnus.c

-- 
1.7.9.5

[PATCH v2 0/4] Add pinctrl support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial pinctrl support for the Broadcom Cygnus SoC.
The Cygnus pinctrl controller supports group based alternate function configuration

Changes from v1:
 - Fix a typo in device tree binding document

Ray Jui (4):
  pinctrl: Broadcom Cygnus pinctrl device tree binding
  pinctrl: cygnus: add initial pinctrl support
  ARM: mach-bcm: enable pinctrl support for Cygnus
  ARM: dts: enable pinctrl for Broadcom Cygnus

 .../bindings/pinctrl/brcm,cygnus-pinctrl.txt       |   92 +++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |    5 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/pinctrl/Kconfig                            |    7 +
 drivers/pinctrl/Makefile                           |    1 +
 drivers/pinctrl/pinctrl-bcm-cygnus.c               |  753 ++++++++++++++++++++
 6 files changed, 859 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
 create mode 100644 drivers/pinctrl/pinctrl-bcm-cygnus.c

-- 
1.7.9.5

[PATCH v2 0/4] Add pinctrl support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial pinctrl support for the Broadcom Cygnus SoC.
The Cygnus pinctrl controller supports group based alternate function configuration

Changes from v1:
 - Fix a typo in device tree binding document

Ray Jui (4):
  pinctrl: Broadcom Cygnus pinctrl device tree binding
  pinctrl: cygnus: add initial pinctrl support
  ARM: mach-bcm: enable pinctrl support for Cygnus
  ARM: dts: enable pinctrl for Broadcom Cygnus

 .../bindings/pinctrl/brcm,cygnus-pinctrl.txt       |   92 +++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |    5 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/pinctrl/Kconfig                            |    7 +
 drivers/pinctrl/Makefile                           |    1 +
 drivers/pinctrl/pinctrl-bcm-cygnus.c               |  753 ++++++++++++++++++++
 6 files changed, 859 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
 create mode 100644 drivers/pinctrl/pinctrl-bcm-cygnus.c

-- 
1.7.9.5

[PATCH v2 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Ray Jui]

Device tree binding documentation for Broadcom Cygnus pinctrl driver

Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
---
 .../bindings/pinctrl/brcm,cygnus-pinctrl.txt       |   92 ++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt

diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
new file mode 100644
index 0000000..4461aaf
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
@@ -0,0 +1,92 @@
+Broadcom Cygnus Pin Controller
+
+The Cygnus pin controller supports setting the alternate functions of groups
+of pins. Pinmux configuration on individual pins is not supported by the
+Cygnus A0 SoC.
+
+Required properties:
+
+- compatible:
+    Must be "brcm,cygnus-pinctrl"
+
+- reg:
+    Define the base and range of the I/O address space that contain the Cygnus
+pin control registers
+
+- brcm,groups:
+    This can be strings of one or more group names. This defines the group(s)
+that one wants to configure
+
+- brcm,function:
+    This is the alternate function that one wants to configure to. Valid
+alternate functions are "alt1", "alt2", "alt3", "alt4"
+
+Each child node represents a configuration. Client devices reference the the
+child node to enable the mux configuration.
+
+For example:
+
+	pinctrl: pinctrl@0x0301d0c8 {
+		compatible = "brcm,cygnus-pinctrl";
+		reg = <0x0301d0c8 0x2c>;
+
+		i2s_0: i2s_0 {
+			brcm,groups = "smart_card0", "smart_card0_fcb";
+			brcm,function = "alt2";
+		};
+
+		i2s_1: i2s_1 {
+			brcm,groups = "smart_card1", "smart_card1_fcb";
+			brcm,function = "alt2";
+		};
+
+		spi_0: spi_0 {
+			brcm,groups = "spi0";
+			brcm,function = "alt1";
+		};
+	}
+
+	spi0@18028000 {
+			compatible = "arm,pl022", "arm,primecell";
+			reg = <0x18028000 0x1000>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			interrupts = <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>;
+			pinctrl-0 = <&spi_0>;
+			clocks = <&axi81_clk>;
+			clock-names = "apb_pclk";
+	};
+
+Consider the following snapshot of Cygnus pinmux table:
+
+number    pin            group              alt1             alt2        alt3        alt4
+------    ---            ----               ----             ----        ----        ----
+42        sc0_clk        smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio24
+43        sc0_cmdvcc_l   smart_card0        SMART CARD0      I2S_0       N/A         STRAP
+44        sc0_detect     smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio25
+45        sc0_fcb        smart_card0_fcb    SMART CARD0_FCB  I2S_0       N/A         chip_gpio26
+46        sc0_io         smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio27
+47        sc0_rst_l      smart_card0        SMART CARD0      SPDIF       N/A         STRAP
+
+Note due to limitation of the Cygnus hardware, pinmux configuration can only
+be group based. To enable I2S_0 function, one needs the following child node
+configuration:
+
+	i2s_0: i2s_0 {
+		brcm,groups = "smart_card0", "smart_card0_fcb";
+		brcm,function = "alt2";
+	};
+
+This tells the Cygnus pin controller to configure groups "smart_card0" and
+"smart_card0_fcb" to I2S_0. With this configuration, pins 42, 43, 44, 45, 46
+become I2S_0, and pin 47 becomes SPDIF
+
+Consider another example, that one wants to configure the above pins as GPIO:
+
+	gpio_24_27: gpio_24_27 {
+		brcm,groups = "smart_card0", "smart_card0_fcb";
+		brcm,function = "alt4";
+	};
+
+With the above configuration, pins 42, 44, 45, 46 become GPIO, and 43 and 47
+become reserved for STRAP
-- 
1.7.9.5

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[PATCH v2 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Ray Jui]

Device tree binding documentation for Broadcom Cygnus pinctrl driver

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../bindings/pinctrl/brcm,cygnus-pinctrl.txt       |   92 ++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt

diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
new file mode 100644
index 0000000..4461aaf
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
@@ -0,0 +1,92 @@
+Broadcom Cygnus Pin Controller
+
+The Cygnus pin controller supports setting the alternate functions of groups
+of pins. Pinmux configuration on individual pins is not supported by the
+Cygnus A0 SoC.
+
+Required properties:
+
+- compatible:
+    Must be "brcm,cygnus-pinctrl"
+
+- reg:
+    Define the base and range of the I/O address space that contain the Cygnus
+pin control registers
+
+- brcm,groups:
+    This can be strings of one or more group names. This defines the group(s)
+that one wants to configure
+
+- brcm,function:
+    This is the alternate function that one wants to configure to. Valid
+alternate functions are "alt1", "alt2", "alt3", "alt4"
+
+Each child node represents a configuration. Client devices reference the the
+child node to enable the mux configuration.
+
+For example:
+
+	pinctrl: pinctrl@0x0301d0c8 {
+		compatible = "brcm,cygnus-pinctrl";
+		reg = <0x0301d0c8 0x2c>;
+
+		i2s_0: i2s_0 {
+			brcm,groups = "smart_card0", "smart_card0_fcb";
+			brcm,function = "alt2";
+		};
+
+		i2s_1: i2s_1 {
+			brcm,groups = "smart_card1", "smart_card1_fcb";
+			brcm,function = "alt2";
+		};
+
+		spi_0: spi_0 {
+			brcm,groups = "spi0";
+			brcm,function = "alt1";
+		};
+	}
+
+	spi0@18028000 {
+			compatible = "arm,pl022", "arm,primecell";
+			reg = <0x18028000 0x1000>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			interrupts = <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>;
+			pinctrl-0 = <&spi_0>;
+			clocks = <&axi81_clk>;
+			clock-names = "apb_pclk";
+	};
+
+Consider the following snapshot of Cygnus pinmux table:
+
+number    pin            group              alt1             alt2        alt3        alt4
+------    ---            ----               ----             ----        ----        ----
+42        sc0_clk        smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio24
+43        sc0_cmdvcc_l   smart_card0        SMART CARD0      I2S_0       N/A         STRAP
+44        sc0_detect     smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio25
+45        sc0_fcb        smart_card0_fcb    SMART CARD0_FCB  I2S_0       N/A         chip_gpio26
+46        sc0_io         smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio27
+47        sc0_rst_l      smart_card0        SMART CARD0      SPDIF       N/A         STRAP
+
+Note due to limitation of the Cygnus hardware, pinmux configuration can only
+be group based. To enable I2S_0 function, one needs the following child node
+configuration:
+
+	i2s_0: i2s_0 {
+		brcm,groups = "smart_card0", "smart_card0_fcb";
+		brcm,function = "alt2";
+	};
+
+This tells the Cygnus pin controller to configure groups "smart_card0" and
+"smart_card0_fcb" to I2S_0. With this configuration, pins 42, 43, 44, 45, 46
+become I2S_0, and pin 47 becomes SPDIF
+
+Consider another example, that one wants to configure the above pins as GPIO:
+
+	gpio_24_27: gpio_24_27 {
+		brcm,groups = "smart_card0", "smart_card0_fcb";
+		brcm,function = "alt4";
+	};
+
+With the above configuration, pins 42, 44, 45, 46 become GPIO, and 43 and 47
+become reserved for STRAP
-- 
1.7.9.5

[PATCH v2 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Ray Jui]

Device tree binding documentation for Broadcom Cygnus pinctrl driver

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../bindings/pinctrl/brcm,cygnus-pinctrl.txt       |   92 ++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt

diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
new file mode 100644
index 0000000..4461aaf
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
@@ -0,0 +1,92 @@
+Broadcom Cygnus Pin Controller
+
+The Cygnus pin controller supports setting the alternate functions of groups
+of pins. Pinmux configuration on individual pins is not supported by the
+Cygnus A0 SoC.
+
+Required properties:
+
+- compatible:
+    Must be "brcm,cygnus-pinctrl"
+
+- reg:
+    Define the base and range of the I/O address space that contain the Cygnus
+pin control registers
+
+- brcm,groups:
+    This can be strings of one or more group names. This defines the group(s)
+that one wants to configure
+
+- brcm,function:
+    This is the alternate function that one wants to configure to. Valid
+alternate functions are "alt1", "alt2", "alt3", "alt4"
+
+Each child node represents a configuration. Client devices reference the the
+child node to enable the mux configuration.
+
+For example:
+
+	pinctrl: pinctrl at 0x0301d0c8 {
+		compatible = "brcm,cygnus-pinctrl";
+		reg = <0x0301d0c8 0x2c>;
+
+		i2s_0: i2s_0 {
+			brcm,groups = "smart_card0", "smart_card0_fcb";
+			brcm,function = "alt2";
+		};
+
+		i2s_1: i2s_1 {
+			brcm,groups = "smart_card1", "smart_card1_fcb";
+			brcm,function = "alt2";
+		};
+
+		spi_0: spi_0 {
+			brcm,groups = "spi0";
+			brcm,function = "alt1";
+		};
+	}
+
+	spi0 at 18028000 {
+			compatible = "arm,pl022", "arm,primecell";
+			reg = <0x18028000 0x1000>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			interrupts = <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>;
+			pinctrl-0 = <&spi_0>;
+			clocks = <&axi81_clk>;
+			clock-names = "apb_pclk";
+	};
+
+Consider the following snapshot of Cygnus pinmux table:
+
+number    pin            group              alt1             alt2        alt3        alt4
+------    ---            ----               ----             ----        ----        ----
+42        sc0_clk        smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio24
+43        sc0_cmdvcc_l   smart_card0        SMART CARD0      I2S_0       N/A         STRAP
+44        sc0_detect     smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio25
+45        sc0_fcb        smart_card0_fcb    SMART CARD0_FCB  I2S_0       N/A         chip_gpio26
+46        sc0_io         smart_card0        SMART CARD0      I2S_0       N/A         chip_gpio27
+47        sc0_rst_l      smart_card0        SMART CARD0      SPDIF       N/A         STRAP
+
+Note due to limitation of the Cygnus hardware, pinmux configuration can only
+be group based. To enable I2S_0 function, one needs the following child node
+configuration:
+
+	i2s_0: i2s_0 {
+		brcm,groups = "smart_card0", "smart_card0_fcb";
+		brcm,function = "alt2";
+	};
+
+This tells the Cygnus pin controller to configure groups "smart_card0" and
+"smart_card0_fcb" to I2S_0. With this configuration, pins 42, 43, 44, 45, 46
+become I2S_0, and pin 47 becomes SPDIF
+
+Consider another example, that one wants to configure the above pins as GPIO:
+
+	gpio_24_27: gpio_24_27 {
+		brcm,groups = "smart_card0", "smart_card0_fcb";
+		brcm,function = "alt4";
+	};
+
+With the above configuration, pins 42, 44, 45, 46 become GPIO, and 43 and 47
+become reserved for STRAP
-- 
1.7.9.5

[PATCH v2 2/4] pinctrl: cygnus: add initial pinctrl support

[Ray Jui]

This adds the initial driver support for the Broadcom Cygnus pinctrl
controller. The Cygnus pinctrl controller supports group based
alternate function configuration

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
---
 drivers/pinctrl/Kconfig              |    7 +
 drivers/pinctrl/Makefile             |    1 +
 drivers/pinctrl/pinctrl-bcm-cygnus.c |  753 ++++++++++++++++++++++++++++++++++
 3 files changed, 761 insertions(+)
 create mode 100644 drivers/pinctrl/pinctrl-bcm-cygnus.c

diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index d014f22..4549e9f 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -85,6 +85,13 @@ config PINCTRL_BCM281XX
 	  BCM28145, and BCM28155 SoCs.  This driver requires the pinctrl
 	  framework.  GPIO is provided by a separate GPIO driver.
 
+config PINCTRL_BCM_CYGNUS
+	bool "Broadcom Cygnus pinctrl driver"
+	depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
+	select PINMUX
+	select PINCONF
+	select GENERIC_PINCONF
+
 config PINCTRL_LANTIQ
 	bool
 	depends on LANTIQ
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index c030b3d..4ed8e8a 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_PINCTRL_BF60x)	+= pinctrl-adi2-bf60x.o
 obj-$(CONFIG_PINCTRL_AT91)	+= pinctrl-at91.o
 obj-$(CONFIG_PINCTRL_BCM2835)	+= pinctrl-bcm2835.o
 obj-$(CONFIG_PINCTRL_BCM281XX)	+= pinctrl-bcm281xx.o
+obj-$(CONFIG_PINCTRL_BCM_CYGNUS)	+= pinctrl-bcm-cygnus.o
 obj-$(CONFIG_PINCTRL_FALCON)	+= pinctrl-falcon.o
 obj-$(CONFIG_PINCTRL_PALMAS)	+= pinctrl-palmas.o
 obj-$(CONFIG_PINCTRL_ROCKCHIP)	+= pinctrl-rockchip.o
diff --git a/drivers/pinctrl/pinctrl-bcm-cygnus.c b/drivers/pinctrl/pinctrl-bcm-cygnus.c
new file mode 100644
index 0000000..eb6e27a
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-bcm-cygnus.c
@@ -0,0 +1,753 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/slab.h>
+
+#include "core.h"
+#include "pinctrl-utils.h"
+
+/*
+ * Alternate function configuration
+ *
+ * @name: name of the alternate function
+ * @group_names: array of strings of group names that can be supported by this
+ * alternate function
+ * @num_groups: total number of groups that can be supported by this alternate
+ * function
+ * @mux: mux setting for this alternate function to be programed
+ */
+struct cygnus_pin_function {
+	const char *name;
+	const char * const *group_names;
+	const unsigned num_groups;
+	unsigned int mux;
+};
+
+/*
+ * Cygnus allows group based pinmux configuration
+ *
+ * @name: name of the group
+ * @pins: array of pins used by this group
+ * @num_pins: total number of pins used by this group
+ * @offset: register offset for pinmux configuration of this group
+ * @shift: bit shift for pinmux configuration of this group
+ */
+struct cygnus_pin_group {
+	const char *name;
+	const unsigned *pins;
+	const unsigned num_pins;
+	const unsigned int offset;
+	const unsigned int shift;
+};
+
+/*
+ * Cygnus pinctrl core
+ *
+ * @pctl: pointer to pinctrl_dev
+ * @dev: pointer to the device
+ * @base: I/O register base for Cygnus pinctrl configuration
+ *
+ */
+struct cygnus_pinctrl {
+	struct pinctrl_dev *pctl;
+	struct device *dev;
+	void __iomem *base;
+
+	const struct pinctrl_pin_desc *pins;
+	unsigned num_pins;
+
+	const struct cygnus_pin_group *groups;
+	unsigned num_groups;
+
+	const struct cygnus_pin_function *functions;
+	unsigned num_functions;
+};
+
+#define CYGNUS_PIN_GROUP(group_name, off, sh)		\
+{							\
+	.name = #group_name,				\
+	.pins = group_name##_pins,			\
+	.num_pins = ARRAY_SIZE(group_name##_pins),	\
+	.offset = off,					\
+	.shift = sh,					\
+}
+
+/*
+ * The following pin description is based on Cygnus I/O MUX spreadsheet
+ */
+static const struct pinctrl_pin_desc cygnus_pinctrl_pins[] = {
+	PINCTRL_PIN(0, "ext_device_reset_n"),
+	PINCTRL_PIN(1, "chip_mode0"),
+	PINCTRL_PIN(2, "chip_mode1"),
+	PINCTRL_PIN(3, "chip_mode2"),
+	PINCTRL_PIN(4, "chip_mode3"),
+	PINCTRL_PIN(5, "chip_mode4"),
+	PINCTRL_PIN(6, "bsc0_scl"),
+	PINCTRL_PIN(7, "bsc0_sda"),
+	PINCTRL_PIN(8, "bsc1_scl"),
+	PINCTRL_PIN(9, "bsc1_sda"),
+	PINCTRL_PIN(10, "d1w_dq"),
+	PINCTRL_PIN(11, "d1wowstz_l"),
+	PINCTRL_PIN(12, "gpio0"),
+	PINCTRL_PIN(13, "gpio1"),
+	PINCTRL_PIN(14, "gpio2"),
+	PINCTRL_PIN(15, "gpio3"),
+	PINCTRL_PIN(16, "gpio4"),
+	PINCTRL_PIN(17, "gpio5"),
+	PINCTRL_PIN(18, "gpio6"),
+	PINCTRL_PIN(19, "gpio7"),
+	PINCTRL_PIN(20, "gpio8"),
+	PINCTRL_PIN(21, "gpio9"),
+	PINCTRL_PIN(22, "gpio10"),
+	PINCTRL_PIN(23, "gpio11"),
+	PINCTRL_PIN(24, "gpio12"),
+	PINCTRL_PIN(25, "gpio13"),
+	PINCTRL_PIN(26, "gpio14"),
+	PINCTRL_PIN(27, "gpio15"),
+	PINCTRL_PIN(28, "gpio16"),
+	PINCTRL_PIN(29, "gpio17"),
+	PINCTRL_PIN(30, "gpio18"),
+	PINCTRL_PIN(31, "gpio19"),
+	PINCTRL_PIN(32, "gpio20"),
+	PINCTRL_PIN(33, "gpio21"),
+	PINCTRL_PIN(34, "gpio22"),
+	PINCTRL_PIN(35, "gpio23"),
+	PINCTRL_PIN(36, "mdc"),
+	PINCTRL_PIN(37, "mdio"),
+	PINCTRL_PIN(38, "pwm0"),
+	PINCTRL_PIN(39, "pwm1"),
+	PINCTRL_PIN(40, "pwm2"),
+	PINCTRL_PIN(41, "pwm3"),
+	PINCTRL_PIN(42, "sc0_clk"),
+	PINCTRL_PIN(43, "sc0_cmdvcc_l"),
+	PINCTRL_PIN(44, "sc0_detect"),
+	PINCTRL_PIN(45, "sc0_fcb"),
+	PINCTRL_PIN(46, "sc0_io"),
+	PINCTRL_PIN(47, "sc0_rst_l"),
+	PINCTRL_PIN(48, "sc1_clk"),
+	PINCTRL_PIN(49, "sc1_cmdvcc_l"),
+	PINCTRL_PIN(50, "sc1_detect"),
+	PINCTRL_PIN(51, "sc1_fcb"),
+	PINCTRL_PIN(52, "sc1_io"),
+	PINCTRL_PIN(53, "sc1_rst_l"),
+	PINCTRL_PIN(54, "spi0_clk"),
+	PINCTRL_PIN(55, "spi0_mosi"),
+	PINCTRL_PIN(56, "spi0_miso"),
+	PINCTRL_PIN(57, "spi0_ss"),
+	PINCTRL_PIN(58, "spi1_clk"),
+	PINCTRL_PIN(59, "spi1_mosi"),
+	PINCTRL_PIN(60, "spi1_miso"),
+	PINCTRL_PIN(61, "spi1_ss"),
+	PINCTRL_PIN(62, "spi2_clk"),
+	PINCTRL_PIN(63, "spi2_mosi"),
+	PINCTRL_PIN(64, "spi2_miso"),
+	PINCTRL_PIN(65, "spi2_ss"),
+	PINCTRL_PIN(66, "spi3_clk"),
+	PINCTRL_PIN(67, "spi3_mosi"),
+	PINCTRL_PIN(68, "spi3_miso"),
+	PINCTRL_PIN(69, "spi3_ss"),
+	PINCTRL_PIN(70, "uart0_cts"),
+	PINCTRL_PIN(71, "uart0_rts"),
+	PINCTRL_PIN(72, "uart0_rx"),
+	PINCTRL_PIN(73, "uart0_tx"),
+	PINCTRL_PIN(74, "uart1_cts"),
+	PINCTRL_PIN(75, "uart1_dcd"),
+	PINCTRL_PIN(76, "uart1_dsr"),
+	PINCTRL_PIN(77, "uart1_dtr"),
+	PINCTRL_PIN(78, "uart1_ri"),
+	PINCTRL_PIN(79, "uart1_rts"),
+	PINCTRL_PIN(80, "uart1_rx"),
+	PINCTRL_PIN(81, "uart1_tx"),
+	PINCTRL_PIN(82, "uart3_rx"),
+	PINCTRL_PIN(83, "uart3_tx"),
+	PINCTRL_PIN(84, "sdio1_clk_sdcard"),
+	PINCTRL_PIN(85, "sdio1_cmd"),
+	PINCTRL_PIN(86, "sdio1_data0"),
+	PINCTRL_PIN(87, "sdio1_data1"),
+	PINCTRL_PIN(88, "sdio1_data2"),
+	PINCTRL_PIN(89, "sdio1_data3"),
+	PINCTRL_PIN(90, "sdio1_wp_n"),
+	PINCTRL_PIN(91, "sdio1_card_rst"),
+	PINCTRL_PIN(92, "sdio1_led_on"),
+	PINCTRL_PIN(93, "sdio1_cd"),
+	PINCTRL_PIN(94, "sdio0_clk_sdcard"),
+	PINCTRL_PIN(95, "sdio0_cmd"),
+	PINCTRL_PIN(96, "sdio0_data0"),
+	PINCTRL_PIN(97, "sdio0_data1"),
+	PINCTRL_PIN(98, "sdio0_data2"),
+	PINCTRL_PIN(99, "sdio0_data3"),
+	PINCTRL_PIN(100, "sdio0_wp_n"),
+	PINCTRL_PIN(101, "sdio0_card_rst"),
+	PINCTRL_PIN(102, "sdio0_led_on"),
+	PINCTRL_PIN(103, "sdio0_cd"),
+	PINCTRL_PIN(104, "sflash_clk"),
+	PINCTRL_PIN(105, "sflash_cs_l"),
+	PINCTRL_PIN(106, "sflash_mosi"),
+	PINCTRL_PIN(107, "sflash_miso"),
+	PINCTRL_PIN(108, "sflash_wp_n"),
+	PINCTRL_PIN(109, "sflash_hold_n"),
+	PINCTRL_PIN(110, "nand_ale"),
+	PINCTRL_PIN(111, "nand_ce0_l"),
+	PINCTRL_PIN(112, "nand_ce1_l"),
+	PINCTRL_PIN(113, "nand_cle"),
+	PINCTRL_PIN(114, "nand_dq0"),
+	PINCTRL_PIN(115, "nand_dq1"),
+	PINCTRL_PIN(116, "nand_dq2"),
+	PINCTRL_PIN(117, "nand_dq3"),
+	PINCTRL_PIN(118, "nand_dq4"),
+	PINCTRL_PIN(119, "nand_dq5"),
+	PINCTRL_PIN(120, "nand_dq6"),
+	PINCTRL_PIN(121, "nand_dq7"),
+	PINCTRL_PIN(122, "nand_rb_l"),
+	PINCTRL_PIN(123, "nand_re_l"),
+	PINCTRL_PIN(124, "nand_we_l"),
+	PINCTRL_PIN(125, "nand_wp_l"),
+	PINCTRL_PIN(126, "lcd_clac"),
+	PINCTRL_PIN(127, "lcd_clcp"),
+	PINCTRL_PIN(128, "lcd_cld0"),
+	PINCTRL_PIN(129, "lcd_cld1"),
+	PINCTRL_PIN(130, "lcd_cld10"),
+	PINCTRL_PIN(131, "lcd_cld11"),
+	PINCTRL_PIN(132, "lcd_cld12"),
+	PINCTRL_PIN(133, "lcd_cld13"),
+	PINCTRL_PIN(134, "lcd_cld14"),
+	PINCTRL_PIN(135, "lcd_cld15"),
+	PINCTRL_PIN(136, "lcd_cld16"),
+	PINCTRL_PIN(137, "lcd_cld17"),
+	PINCTRL_PIN(138, "lcd_cld18"),
+	PINCTRL_PIN(139, "lcd_cld19"),
+	PINCTRL_PIN(140, "lcd_cld2"),
+	PINCTRL_PIN(141, "lcd_cld20"),
+	PINCTRL_PIN(142, "lcd_cld21"),
+	PINCTRL_PIN(143, "lcd_cld22"),
+	PINCTRL_PIN(144, "lcd_cld23"),
+	PINCTRL_PIN(145, "lcd_cld3"),
+	PINCTRL_PIN(146, "lcd_cld4"),
+	PINCTRL_PIN(147, "lcd_cld5"),
+	PINCTRL_PIN(148, "lcd_cld6"),
+	PINCTRL_PIN(149, "lcd_cld7"),
+	PINCTRL_PIN(150, "lcd_cld8"),
+	PINCTRL_PIN(151, "lcd_cld9"),
+	PINCTRL_PIN(152, "lcd_clfp"),
+	PINCTRL_PIN(153, "lcd_clle"),
+	PINCTRL_PIN(154, "lcd_cllp"),
+	PINCTRL_PIN(155, "lcd_clpower"),
+	PINCTRL_PIN(156, "camera_vsync"),
+	PINCTRL_PIN(157, "camera_trigger"),
+	PINCTRL_PIN(158, "camera_strobe"),
+	PINCTRL_PIN(159, "camera_standby"),
+	PINCTRL_PIN(160, "camera_reset_n"),
+	PINCTRL_PIN(161, "camera_pixdata9"),
+	PINCTRL_PIN(162, "camera_pixdata8"),
+	PINCTRL_PIN(163, "camera_pixdata7"),
+	PINCTRL_PIN(164, "camera_pixdata6"),
+	PINCTRL_PIN(165, "camera_pixdata5"),
+	PINCTRL_PIN(166, "camera_pixdata4"),
+	PINCTRL_PIN(167, "camera_pixdata3"),
+	PINCTRL_PIN(168, "camera_pixdata2"),
+	PINCTRL_PIN(169, "camera_pixdata1"),
+	PINCTRL_PIN(170, "camera_pixdata0"),
+	PINCTRL_PIN(171, "camera_pixclk"),
+	PINCTRL_PIN(172, "camera_hsync"),
+	PINCTRL_PIN(173, "camera_pll_ref_clk"),
+	PINCTRL_PIN(174, "usb_id_indication"),
+	PINCTRL_PIN(175, "usb_vbus_indication"),
+	PINCTRL_PIN(176, "gpio0_3p3"),
+	PINCTRL_PIN(177, "gpio1_3p3"),
+	PINCTRL_PIN(178, "gpio2_3p3"),
+	PINCTRL_PIN(179, "gpio3_3p3"),
+};
+
+/*
+ * List of groups of pins
+ */
+static const unsigned gpio0_pins[] = { 12 };
+static const unsigned gpio1_pins[] = { 13 };
+static const unsigned gpio2_pins[] = { 14 };
+static const unsigned gpio3_pins[] = { 15 };
+static const unsigned gpio4_pins[] = { 16 };
+static const unsigned gpio5_pins[] = { 17 };
+static const unsigned gpio6_pins[] = { 18 };
+static const unsigned gpio7_pins[] = { 19 };
+static const unsigned gpio8_pins[] = { 20 };
+static const unsigned gpio9_pins[] = { 21 };
+static const unsigned gpio10_pins[] = { 22 };
+static const unsigned gpio11_pins[] = { 23 };
+static const unsigned gpio12_pins[] = { 24 };
+static const unsigned gpio13_pins[] = { 25 };
+static const unsigned gpio14_pins[] = { 26 };
+static const unsigned gpio15_pins[] = { 27 };
+static const unsigned gpio16_pins[] = { 28 };
+static const unsigned gpio17_pins[] = { 29 };
+static const unsigned gpio18_pins[] = { 30 };
+static const unsigned gpio19_pins[] = { 31 };
+static const unsigned gpio20_pins[] = { 32 };
+static const unsigned gpio21_pins[] = { 33 };
+static const unsigned gpio22_pins[] = { 34 };
+static const unsigned gpio23_pins[] = { 35 };
+static const unsigned pwm0_pins[] = { 38 };
+static const unsigned pwm1_pins[] = { 39 };
+static const unsigned pwm2_pins[] = { 40 };
+static const unsigned pwm3_pins[] = { 41 };
+static const unsigned sdio0_pins[] = { 94, 95, 96, 97, 98, 99 };
+static const unsigned smart_card0_pins[] = { 42, 43, 44, 46, 47 };
+static const unsigned smart_card1_pins[] = { 48, 49, 50, 52, 53 };
+static const unsigned spi0_pins[] = { 54, 55, 56, 57 };
+static const unsigned spi1_pins[] = { 58, 59, 60, 61 };
+static const unsigned spi2_pins[] = { 62, 63, 64, 65 };
+static const unsigned spi3_pins[] = { 66, 67, 68, 69 };
+static const unsigned d1w_pins[] = { 10, 11 };
+static const unsigned lcd_pins[] = { 126, 127, 128, 129, 130, 131, 132,	133,
+	134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147,
+	148, 149, 150, 151, 152, 153, 154, 155 };
+static const unsigned uart0_pins[] = { 70, 71, 72, 73 };
+static const unsigned uart1_dte_pins[] = { 75, 76, 77, 78 };
+static const unsigned uart1_pins[] = { 74, 79, 80, 81 };
+static const unsigned uart3_pins[] = { 82, 83 };
+static const unsigned qspi_pins[] = { 104, 105, 106, 107 };
+static const unsigned nand_pins[] = { 110, 111, 112, 113, 114, 115, 116, 117,
+	118, 119, 120, 121, 122, 123, 124, 125 };
+static const unsigned sdio0_cd_pins[] = { 103 };
+static const unsigned sdio0_mmc_pins[] = { 100, 101, 102 };
+static const unsigned can0_spi4_pins[] = { 86, 87 };
+static const unsigned can1_spi4_pins[] = { 88, 89 };
+static const unsigned sdio1_cd_pins[] = { 93 };
+static const unsigned sdio1_led_pins[] = { 84, 85 };
+static const unsigned sdio1_mmc_pins[] = { 90, 91, 92 };
+static const unsigned camera_led_pins[] = { 156, 157, 158, 159, 160 };
+static const unsigned camera_rgmii_pins[] = { 169, 170, 171, 169, 170, 171,
+	172, 173 };
+static const unsigned camera_sram_rgmii_pins[] = { 161, 162, 163, 164, 165,
+	166, 167, 168 };
+static const unsigned qspi_gpio_pins[] = { 108, 109 };
+static const unsigned smart_card0_fcb_pins[] = { 45 };
+static const unsigned smart_card1_fcb_pins[] = { 51 };
+static const unsigned gpio0_3p3_pins[] = { 176 };
+static const unsigned gpio1_3p3_pins[] = { 177 };
+static const unsigned gpio2_3p3_pins[] = { 178 };
+
+/*
+ * List of groups names. Need to match the order in cygnus_pin_groups
+ */
+static const char * const cygnus_pin_group_names[] = {
+	"gpio0",
+	"gpio1",
+	"gpio2",
+	"gpio3",
+	"gpio4",
+	"gpio5",
+	"gpio6",
+	"gpio7",
+	"gpio8",
+	"gpio9",
+	"gpio10",
+	"gpio11",
+	"gpio12",
+	"gpio13",
+	"gpio14",
+	"gpio15",
+	"gpio16",
+	"gpio17",
+	"gpio18",
+	"gpio19",
+	"gpio20",
+	"gpio21",
+	"gpio22",
+	"gpio23",
+	"pwm0",
+	"pwm1",
+	"pwm2",
+	"pwm3",
+	"sdio0",
+	"smart_card0",
+	"smart_card1",
+	"spi0",
+	"spi1",
+	"spi2",
+	"spi3",
+	"d1w",
+	"lcd",
+	"uart0",
+	"uart1_dte",
+	"uart1",
+	"uart3",
+	"qspi",
+	"nand",
+	"sdio0_cd",
+	"sdio0_mmc",
+	"can0_spi4",
+	"can1_spi4",
+	"sdio1_cd",
+	"sdio1_led",
+	"sdio1_mmc",
+	"camera_led",
+	"camera_rgmii",
+	"camera_sram_rgmii",
+	"qspi_gpio",
+	"smart_card0_fcb",
+	"smart_card1_fcb",
+	"gpio0_3p3",
+	"gpio1_3p3",
+	"gpio2_3p3",
+};
+
+/*
+ * List of groups. Need to match the order in cygnus_pin_group_names
+ */
+static const struct cygnus_pin_group cygnus_pin_groups[] = {
+	CYGNUS_PIN_GROUP(gpio0, 0x0, 0),
+	CYGNUS_PIN_GROUP(gpio1, 0x0, 4),
+	CYGNUS_PIN_GROUP(gpio2, 0x0, 8),
+	CYGNUS_PIN_GROUP(gpio3, 0x0, 12),
+	CYGNUS_PIN_GROUP(gpio4, 0x0, 16),
+	CYGNUS_PIN_GROUP(gpio5, 0x0, 20),
+	CYGNUS_PIN_GROUP(gpio6, 0x0, 24),
+	CYGNUS_PIN_GROUP(gpio7, 0x0, 28),
+	CYGNUS_PIN_GROUP(gpio8, 0x4, 0),
+	CYGNUS_PIN_GROUP(gpio9, 0x4, 4),
+	CYGNUS_PIN_GROUP(gpio10, 0x4, 8),
+	CYGNUS_PIN_GROUP(gpio11, 0x4, 12),
+	CYGNUS_PIN_GROUP(gpio12, 0x4, 16),
+	CYGNUS_PIN_GROUP(gpio13, 0x4, 20),
+	CYGNUS_PIN_GROUP(gpio14, 0x4, 24),
+	CYGNUS_PIN_GROUP(gpio15, 0x4, 28),
+	CYGNUS_PIN_GROUP(gpio16, 0x8, 0),
+	CYGNUS_PIN_GROUP(gpio17, 0x8, 4),
+	CYGNUS_PIN_GROUP(gpio18, 0x8, 8),
+	CYGNUS_PIN_GROUP(gpio19, 0x8, 12),
+	CYGNUS_PIN_GROUP(gpio20, 0x8, 16),
+	CYGNUS_PIN_GROUP(gpio21, 0x8, 20),
+	CYGNUS_PIN_GROUP(gpio22, 0x8, 24),
+	CYGNUS_PIN_GROUP(gpio23, 0x8, 28),
+	CYGNUS_PIN_GROUP(pwm0, 0xc, 0),
+	CYGNUS_PIN_GROUP(pwm1, 0xc, 4),
+	CYGNUS_PIN_GROUP(pwm2, 0xc, 8),
+	CYGNUS_PIN_GROUP(pwm3, 0xc, 12),
+	CYGNUS_PIN_GROUP(sdio0, 0xc, 16),
+	CYGNUS_PIN_GROUP(smart_card0, 0xc, 20),
+	CYGNUS_PIN_GROUP(smart_card1, 0xc, 24),
+	CYGNUS_PIN_GROUP(spi0, 0x10, 0),
+	CYGNUS_PIN_GROUP(spi1, 0x10, 4),
+	CYGNUS_PIN_GROUP(spi2, 0x10, 8),
+	CYGNUS_PIN_GROUP(spi3, 0x10, 12),
+	CYGNUS_PIN_GROUP(d1w, 0x10, 16),
+	CYGNUS_PIN_GROUP(lcd, 0x10, 20),
+	CYGNUS_PIN_GROUP(uart0, 0x14, 0),
+	CYGNUS_PIN_GROUP(uart1_dte, 0x14, 4),
+	CYGNUS_PIN_GROUP(uart1, 0x14, 8),
+	CYGNUS_PIN_GROUP(uart3, 0x14, 12),
+	CYGNUS_PIN_GROUP(qspi, 0x14, 16),
+	CYGNUS_PIN_GROUP(nand, 0x14, 20),
+	CYGNUS_PIN_GROUP(sdio0_cd, 0x18, 0),
+	CYGNUS_PIN_GROUP(sdio0_mmc, 0x18, 4),
+	CYGNUS_PIN_GROUP(can0_spi4, 0x18, 8),
+	CYGNUS_PIN_GROUP(can1_spi4, 0x18, 12),
+	CYGNUS_PIN_GROUP(sdio1_cd, 0x18, 16),
+	CYGNUS_PIN_GROUP(sdio1_led, 0x18, 20),
+	CYGNUS_PIN_GROUP(sdio1_mmc, 0x18, 24),
+	CYGNUS_PIN_GROUP(camera_led, 0x1c, 0),
+	CYGNUS_PIN_GROUP(camera_rgmii, 0x1c, 4),
+	CYGNUS_PIN_GROUP(camera_sram_rgmii, 0x1c, 8),
+	CYGNUS_PIN_GROUP(qspi_gpio, 0x1c, 12),
+	CYGNUS_PIN_GROUP(smart_card0_fcb, 0x20, 0),
+	CYGNUS_PIN_GROUP(smart_card1_fcb, 0x20, 4),
+	CYGNUS_PIN_GROUP(gpio0_3p3, 0x28, 0),
+	CYGNUS_PIN_GROUP(gpio1_3p3, 0x28, 4),
+	CYGNUS_PIN_GROUP(gpio2_3p3, 0x28, 8),
+};
+
+#define CYGNUS_PIN_FUNCTION(fcn_name, mux_val)			\
+{								\
+	.name = #fcn_name,					\
+	.group_names = cygnus_pin_group_names,			\
+	.num_groups = ARRAY_SIZE(cygnus_pin_group_names),	\
+	.mux = mux_val,						\
+}
+
+/*
+ * Cygnus has 4 alternate functions. All groups can be configured to any of
+ * the 4 alternate functions
+ */
+static const struct cygnus_pin_function cygnus_pin_functions[] = {
+	CYGNUS_PIN_FUNCTION(alt1, 0),
+	CYGNUS_PIN_FUNCTION(alt2, 1),
+	CYGNUS_PIN_FUNCTION(alt3, 2),
+	CYGNUS_PIN_FUNCTION(alt4, 3),
+};
+
+static int cygnus_get_groups_count(struct pinctrl_dev *pctrl_dev)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->num_groups;
+}
+
+static const char *cygnus_get_group_name(struct pinctrl_dev *pctrl_dev,
+		unsigned selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->groups[selector].name;
+}
+
+static int cygnus_get_group_pins(struct pinctrl_dev *pctrl_dev,
+		unsigned selector, const unsigned **pins,
+		unsigned *num_pins)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	*pins = pinctrl->groups[selector].pins;
+	*num_pins = pinctrl->groups[selector].num_pins;
+
+	return 0;
+}
+
+static void cygnus_pin_dbg_show(struct pinctrl_dev *pctrl_dev,
+		struct seq_file *s, unsigned offset)
+{
+	seq_printf(s, " %s", dev_name(pctrl_dev->dev));
+}
+
+static int find_matched_function(const char *function_name)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(cygnus_pin_functions); i++) {
+		if (!strcmp(cygnus_pin_functions[i].name, function_name))
+			return (int)cygnus_pin_functions[i].mux;
+	}
+
+	return -EINVAL;
+}
+
+static int cygnus_dt_node_to_map(struct pinctrl_dev *pctrl_dev,
+		struct device_node *np, struct pinctrl_map **map,
+		unsigned *num_maps)
+{
+	int ret, num_groups;
+	unsigned reserved_maps = 0;
+	struct property *prop;
+	const char *group_name, *function_name;
+
+	*map = NULL;
+	*num_maps = 0;
+
+	num_groups = of_property_count_strings(np, "brcm,groups");
+	if (num_groups < 0) {
+		dev_err(pctrl_dev->dev,
+			"could not parse property brcm,groups\n");
+		return -EINVAL;
+	}
+
+	ret = of_property_read_string(np, "brcm,function", &function_name);
+	if (ret < 0) {
+		dev_err(pctrl_dev->dev,
+			"could not parse property brcm,function\n");
+		return -EINVAL;
+	}
+
+	/* make sure it's a valid alternate function */
+	ret = find_matched_function(function_name);
+	if (ret < 0) {
+		dev_err(pctrl_dev->dev, "invalid function name: %s\n",
+				function_name);
+	}
+
+	ret = pinctrl_utils_reserve_map(pctrl_dev, map, &reserved_maps,
+			num_maps, num_groups);
+	if (ret) {
+		dev_err(pctrl_dev->dev, "unable to reserve map\n");
+		return ret;
+	}
+
+	of_property_for_each_string(np, "brcm,groups", prop, group_name) {
+		ret = pinctrl_utils_add_map_mux(pctrl_dev, map,
+				&reserved_maps, num_maps, group_name,
+				function_name);
+		if (ret) {
+			dev_err(pctrl_dev->dev, "can't add map: %d\n", ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static struct pinctrl_ops cygnus_pinctrl_ops = {
+	.get_groups_count = cygnus_get_groups_count,
+	.get_group_name = cygnus_get_group_name,
+	.get_group_pins = cygnus_get_group_pins,
+	.pin_dbg_show = cygnus_pin_dbg_show,
+	.dt_node_to_map = cygnus_dt_node_to_map,
+	.dt_free_map = pinctrl_utils_dt_free_map,
+};
+
+static int cygnus_get_functions_count(struct pinctrl_dev *pctrl_dev)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->num_functions;
+}
+
+static const char *cygnus_get_function_name(struct pinctrl_dev *pctrl_dev,
+		unsigned selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->functions[selector].name;
+}
+
+static int cygnus_get_function_groups(struct pinctrl_dev *pctrl_dev,
+	unsigned selector, const char * const **groups,
+	unsigned * const num_groups)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	*groups = pinctrl->functions[selector].group_names;
+	*num_groups = pinctrl->functions[selector].num_groups;
+
+	return 0;
+}
+
+static int cygnus_pinmux_set_mux(struct pinctrl_dev *pctrl_dev,
+		unsigned function_selector, unsigned group_selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+	const struct cygnus_pin_function *function =
+			&pinctrl->functions[function_selector];
+	const struct cygnus_pin_group *group =
+			&pinctrl->groups[group_selector];
+	u32 val, mask = 0x7;
+
+	dev_dbg(pctrl_dev->dev,
+	"group:%s with offset:0x%08x shift:%u set to function: %s mux:%u\n",
+		group->name, group->offset, group->shift, function->name,
+		function->mux);
+
+	val = readl(pinctrl->base + group->offset);
+	val &= ~(mask << group->shift);
+	val |= function->mux << group->shift;
+	writel(val, pinctrl->base + group->offset);
+
+	return 0;
+}
+
+static struct pinmux_ops cygnus_pinmux_ops = {
+	.get_functions_count = cygnus_get_functions_count,
+	.get_function_name = cygnus_get_function_name,
+	.get_function_groups = cygnus_get_function_groups,
+	.set_mux = cygnus_pinmux_set_mux,
+};
+
+static struct pinctrl_desc cygnus_pinctrl_desc = {
+	.pctlops = &cygnus_pinctrl_ops,
+	.pmxops = &cygnus_pinmux_ops,
+	.owner = THIS_MODULE,
+};
+
+static int cygnus_pinctrl_probe(struct platform_device *pdev)
+{
+	struct cygnus_pinctrl *pinctrl;
+	struct resource *res;
+
+	pinctrl = devm_kzalloc(&pdev->dev, sizeof(*pinctrl), GFP_KERNEL);
+	if (!pinctrl) {
+		dev_err(&pdev->dev, "unable to allocate memory\n");
+		return -ENOMEM;
+	}
+	pinctrl->dev = &pdev->dev;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "unable to get resource\n");
+		return -ENOENT;
+	}
+
+	pinctrl->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(pinctrl->base)) {
+		dev_err(&pdev->dev, "unable to map I/O space\n");
+		return PTR_ERR(pinctrl->base);
+	}
+
+	pinctrl->pins = cygnus_pinctrl_pins;
+	pinctrl->num_pins = ARRAY_SIZE(cygnus_pinctrl_pins);
+	pinctrl->groups = cygnus_pin_groups;
+	pinctrl->num_groups = ARRAY_SIZE(cygnus_pin_groups);
+	pinctrl->functions = cygnus_pin_functions;
+	pinctrl->num_functions = ARRAY_SIZE(cygnus_pin_functions);
+
+	cygnus_pinctrl_desc.name = dev_name(&pdev->dev);
+	cygnus_pinctrl_desc.pins = cygnus_pinctrl_pins;
+	cygnus_pinctrl_desc.npins = ARRAY_SIZE(cygnus_pinctrl_pins);
+
+	pinctrl->pctl = pinctrl_register(&cygnus_pinctrl_desc, &pdev->dev,
+			pinctrl);
+	if (!pinctrl->pctl) {
+		dev_err(&pdev->dev, "unable to register cygnus pinctrl\n");
+		return -EINVAL;
+	}
+
+	platform_set_drvdata(pdev, pinctrl);
+
+	return 0;
+}
+
+static int cygnus_pinctrl_remove(struct platform_device *pdev)
+{
+	struct cygnus_pinctrl *pinctrl = platform_get_drvdata(pdev);
+
+	pinctrl_unregister(pinctrl->pctl);
+	platform_set_drvdata(pdev, NULL);
+
+	return 0;
+}
+
+static struct of_device_id cygnus_pinctrl_of_match[] = {
+	{ .compatible = "brcm,cygnus-pinctrl", },
+	{ },
+};
+
+static struct platform_driver cygnus_pinctrl_driver = {
+	.driver = {
+		.name = "cygnus-pinctrl",
+		.owner = THIS_MODULE,
+		.of_match_table = cygnus_pinctrl_of_match,
+	},
+	.probe = cygnus_pinctrl_probe,
+	.remove = cygnus_pinctrl_remove,
+};
+
+static int __init cygnus_pinctrl_init(void)
+{
+	return platform_driver_register(&cygnus_pinctrl_driver);
+}
+arch_initcall(cygnus_pinctrl_init);
+
+static void __exit cygnus_pinctrl_exit(void)
+{
+	platform_driver_unregister(&cygnus_pinctrl_driver);
+}
+module_exit(cygnus_pinctrl_exit);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus pinctrl driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v2 2/4] pinctrl: cygnus: add initial pinctrl support

[Ray Jui]

This adds the initial driver support for the Broadcom Cygnus pinctrl
controller. The Cygnus pinctrl controller supports group based
alternate function configuration

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
---
 drivers/pinctrl/Kconfig              |    7 +
 drivers/pinctrl/Makefile             |    1 +
 drivers/pinctrl/pinctrl-bcm-cygnus.c |  753 ++++++++++++++++++++++++++++++++++
 3 files changed, 761 insertions(+)
 create mode 100644 drivers/pinctrl/pinctrl-bcm-cygnus.c

diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index d014f22..4549e9f 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -85,6 +85,13 @@ config PINCTRL_BCM281XX
 	  BCM28145, and BCM28155 SoCs.  This driver requires the pinctrl
 	  framework.  GPIO is provided by a separate GPIO driver.
 
+config PINCTRL_BCM_CYGNUS
+	bool "Broadcom Cygnus pinctrl driver"
+	depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
+	select PINMUX
+	select PINCONF
+	select GENERIC_PINCONF
+
 config PINCTRL_LANTIQ
 	bool
 	depends on LANTIQ
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index c030b3d..4ed8e8a 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_PINCTRL_BF60x)	+= pinctrl-adi2-bf60x.o
 obj-$(CONFIG_PINCTRL_AT91)	+= pinctrl-at91.o
 obj-$(CONFIG_PINCTRL_BCM2835)	+= pinctrl-bcm2835.o
 obj-$(CONFIG_PINCTRL_BCM281XX)	+= pinctrl-bcm281xx.o
+obj-$(CONFIG_PINCTRL_BCM_CYGNUS)	+= pinctrl-bcm-cygnus.o
 obj-$(CONFIG_PINCTRL_FALCON)	+= pinctrl-falcon.o
 obj-$(CONFIG_PINCTRL_PALMAS)	+= pinctrl-palmas.o
 obj-$(CONFIG_PINCTRL_ROCKCHIP)	+= pinctrl-rockchip.o
diff --git a/drivers/pinctrl/pinctrl-bcm-cygnus.c b/drivers/pinctrl/pinctrl-bcm-cygnus.c
new file mode 100644
index 0000000..eb6e27a
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-bcm-cygnus.c
@@ -0,0 +1,753 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/slab.h>
+
+#include "core.h"
+#include "pinctrl-utils.h"
+
+/*
+ * Alternate function configuration
+ *
+ * @name: name of the alternate function
+ * @group_names: array of strings of group names that can be supported by this
+ * alternate function
+ * @num_groups: total number of groups that can be supported by this alternate
+ * function
+ * @mux: mux setting for this alternate function to be programed
+ */
+struct cygnus_pin_function {
+	const char *name;
+	const char * const *group_names;
+	const unsigned num_groups;
+	unsigned int mux;
+};
+
+/*
+ * Cygnus allows group based pinmux configuration
+ *
+ * @name: name of the group
+ * @pins: array of pins used by this group
+ * @num_pins: total number of pins used by this group
+ * @offset: register offset for pinmux configuration of this group
+ * @shift: bit shift for pinmux configuration of this group
+ */
+struct cygnus_pin_group {
+	const char *name;
+	const unsigned *pins;
+	const unsigned num_pins;
+	const unsigned int offset;
+	const unsigned int shift;
+};
+
+/*
+ * Cygnus pinctrl core
+ *
+ * @pctl: pointer to pinctrl_dev
+ * @dev: pointer to the device
+ * @base: I/O register base for Cygnus pinctrl configuration
+ *
+ */
+struct cygnus_pinctrl {
+	struct pinctrl_dev *pctl;
+	struct device *dev;
+	void __iomem *base;
+
+	const struct pinctrl_pin_desc *pins;
+	unsigned num_pins;
+
+	const struct cygnus_pin_group *groups;
+	unsigned num_groups;
+
+	const struct cygnus_pin_function *functions;
+	unsigned num_functions;
+};
+
+#define CYGNUS_PIN_GROUP(group_name, off, sh)		\
+{							\
+	.name = #group_name,				\
+	.pins = group_name##_pins,			\
+	.num_pins = ARRAY_SIZE(group_name##_pins),	\
+	.offset = off,					\
+	.shift = sh,					\
+}
+
+/*
+ * The following pin description is based on Cygnus I/O MUX spreadsheet
+ */
+static const struct pinctrl_pin_desc cygnus_pinctrl_pins[] = {
+	PINCTRL_PIN(0, "ext_device_reset_n"),
+	PINCTRL_PIN(1, "chip_mode0"),
+	PINCTRL_PIN(2, "chip_mode1"),
+	PINCTRL_PIN(3, "chip_mode2"),
+	PINCTRL_PIN(4, "chip_mode3"),
+	PINCTRL_PIN(5, "chip_mode4"),
+	PINCTRL_PIN(6, "bsc0_scl"),
+	PINCTRL_PIN(7, "bsc0_sda"),
+	PINCTRL_PIN(8, "bsc1_scl"),
+	PINCTRL_PIN(9, "bsc1_sda"),
+	PINCTRL_PIN(10, "d1w_dq"),
+	PINCTRL_PIN(11, "d1wowstz_l"),
+	PINCTRL_PIN(12, "gpio0"),
+	PINCTRL_PIN(13, "gpio1"),
+	PINCTRL_PIN(14, "gpio2"),
+	PINCTRL_PIN(15, "gpio3"),
+	PINCTRL_PIN(16, "gpio4"),
+	PINCTRL_PIN(17, "gpio5"),
+	PINCTRL_PIN(18, "gpio6"),
+	PINCTRL_PIN(19, "gpio7"),
+	PINCTRL_PIN(20, "gpio8"),
+	PINCTRL_PIN(21, "gpio9"),
+	PINCTRL_PIN(22, "gpio10"),
+	PINCTRL_PIN(23, "gpio11"),
+	PINCTRL_PIN(24, "gpio12"),
+	PINCTRL_PIN(25, "gpio13"),
+	PINCTRL_PIN(26, "gpio14"),
+	PINCTRL_PIN(27, "gpio15"),
+	PINCTRL_PIN(28, "gpio16"),
+	PINCTRL_PIN(29, "gpio17"),
+	PINCTRL_PIN(30, "gpio18"),
+	PINCTRL_PIN(31, "gpio19"),
+	PINCTRL_PIN(32, "gpio20"),
+	PINCTRL_PIN(33, "gpio21"),
+	PINCTRL_PIN(34, "gpio22"),
+	PINCTRL_PIN(35, "gpio23"),
+	PINCTRL_PIN(36, "mdc"),
+	PINCTRL_PIN(37, "mdio"),
+	PINCTRL_PIN(38, "pwm0"),
+	PINCTRL_PIN(39, "pwm1"),
+	PINCTRL_PIN(40, "pwm2"),
+	PINCTRL_PIN(41, "pwm3"),
+	PINCTRL_PIN(42, "sc0_clk"),
+	PINCTRL_PIN(43, "sc0_cmdvcc_l"),
+	PINCTRL_PIN(44, "sc0_detect"),
+	PINCTRL_PIN(45, "sc0_fcb"),
+	PINCTRL_PIN(46, "sc0_io"),
+	PINCTRL_PIN(47, "sc0_rst_l"),
+	PINCTRL_PIN(48, "sc1_clk"),
+	PINCTRL_PIN(49, "sc1_cmdvcc_l"),
+	PINCTRL_PIN(50, "sc1_detect"),
+	PINCTRL_PIN(51, "sc1_fcb"),
+	PINCTRL_PIN(52, "sc1_io"),
+	PINCTRL_PIN(53, "sc1_rst_l"),
+	PINCTRL_PIN(54, "spi0_clk"),
+	PINCTRL_PIN(55, "spi0_mosi"),
+	PINCTRL_PIN(56, "spi0_miso"),
+	PINCTRL_PIN(57, "spi0_ss"),
+	PINCTRL_PIN(58, "spi1_clk"),
+	PINCTRL_PIN(59, "spi1_mosi"),
+	PINCTRL_PIN(60, "spi1_miso"),
+	PINCTRL_PIN(61, "spi1_ss"),
+	PINCTRL_PIN(62, "spi2_clk"),
+	PINCTRL_PIN(63, "spi2_mosi"),
+	PINCTRL_PIN(64, "spi2_miso"),
+	PINCTRL_PIN(65, "spi2_ss"),
+	PINCTRL_PIN(66, "spi3_clk"),
+	PINCTRL_PIN(67, "spi3_mosi"),
+	PINCTRL_PIN(68, "spi3_miso"),
+	PINCTRL_PIN(69, "spi3_ss"),
+	PINCTRL_PIN(70, "uart0_cts"),
+	PINCTRL_PIN(71, "uart0_rts"),
+	PINCTRL_PIN(72, "uart0_rx"),
+	PINCTRL_PIN(73, "uart0_tx"),
+	PINCTRL_PIN(74, "uart1_cts"),
+	PINCTRL_PIN(75, "uart1_dcd"),
+	PINCTRL_PIN(76, "uart1_dsr"),
+	PINCTRL_PIN(77, "uart1_dtr"),
+	PINCTRL_PIN(78, "uart1_ri"),
+	PINCTRL_PIN(79, "uart1_rts"),
+	PINCTRL_PIN(80, "uart1_rx"),
+	PINCTRL_PIN(81, "uart1_tx"),
+	PINCTRL_PIN(82, "uart3_rx"),
+	PINCTRL_PIN(83, "uart3_tx"),
+	PINCTRL_PIN(84, "sdio1_clk_sdcard"),
+	PINCTRL_PIN(85, "sdio1_cmd"),
+	PINCTRL_PIN(86, "sdio1_data0"),
+	PINCTRL_PIN(87, "sdio1_data1"),
+	PINCTRL_PIN(88, "sdio1_data2"),
+	PINCTRL_PIN(89, "sdio1_data3"),
+	PINCTRL_PIN(90, "sdio1_wp_n"),
+	PINCTRL_PIN(91, "sdio1_card_rst"),
+	PINCTRL_PIN(92, "sdio1_led_on"),
+	PINCTRL_PIN(93, "sdio1_cd"),
+	PINCTRL_PIN(94, "sdio0_clk_sdcard"),
+	PINCTRL_PIN(95, "sdio0_cmd"),
+	PINCTRL_PIN(96, "sdio0_data0"),
+	PINCTRL_PIN(97, "sdio0_data1"),
+	PINCTRL_PIN(98, "sdio0_data2"),
+	PINCTRL_PIN(99, "sdio0_data3"),
+	PINCTRL_PIN(100, "sdio0_wp_n"),
+	PINCTRL_PIN(101, "sdio0_card_rst"),
+	PINCTRL_PIN(102, "sdio0_led_on"),
+	PINCTRL_PIN(103, "sdio0_cd"),
+	PINCTRL_PIN(104, "sflash_clk"),
+	PINCTRL_PIN(105, "sflash_cs_l"),
+	PINCTRL_PIN(106, "sflash_mosi"),
+	PINCTRL_PIN(107, "sflash_miso"),
+	PINCTRL_PIN(108, "sflash_wp_n"),
+	PINCTRL_PIN(109, "sflash_hold_n"),
+	PINCTRL_PIN(110, "nand_ale"),
+	PINCTRL_PIN(111, "nand_ce0_l"),
+	PINCTRL_PIN(112, "nand_ce1_l"),
+	PINCTRL_PIN(113, "nand_cle"),
+	PINCTRL_PIN(114, "nand_dq0"),
+	PINCTRL_PIN(115, "nand_dq1"),
+	PINCTRL_PIN(116, "nand_dq2"),
+	PINCTRL_PIN(117, "nand_dq3"),
+	PINCTRL_PIN(118, "nand_dq4"),
+	PINCTRL_PIN(119, "nand_dq5"),
+	PINCTRL_PIN(120, "nand_dq6"),
+	PINCTRL_PIN(121, "nand_dq7"),
+	PINCTRL_PIN(122, "nand_rb_l"),
+	PINCTRL_PIN(123, "nand_re_l"),
+	PINCTRL_PIN(124, "nand_we_l"),
+	PINCTRL_PIN(125, "nand_wp_l"),
+	PINCTRL_PIN(126, "lcd_clac"),
+	PINCTRL_PIN(127, "lcd_clcp"),
+	PINCTRL_PIN(128, "lcd_cld0"),
+	PINCTRL_PIN(129, "lcd_cld1"),
+	PINCTRL_PIN(130, "lcd_cld10"),
+	PINCTRL_PIN(131, "lcd_cld11"),
+	PINCTRL_PIN(132, "lcd_cld12"),
+	PINCTRL_PIN(133, "lcd_cld13"),
+	PINCTRL_PIN(134, "lcd_cld14"),
+	PINCTRL_PIN(135, "lcd_cld15"),
+	PINCTRL_PIN(136, "lcd_cld16"),
+	PINCTRL_PIN(137, "lcd_cld17"),
+	PINCTRL_PIN(138, "lcd_cld18"),
+	PINCTRL_PIN(139, "lcd_cld19"),
+	PINCTRL_PIN(140, "lcd_cld2"),
+	PINCTRL_PIN(141, "lcd_cld20"),
+	PINCTRL_PIN(142, "lcd_cld21"),
+	PINCTRL_PIN(143, "lcd_cld22"),
+	PINCTRL_PIN(144, "lcd_cld23"),
+	PINCTRL_PIN(145, "lcd_cld3"),
+	PINCTRL_PIN(146, "lcd_cld4"),
+	PINCTRL_PIN(147, "lcd_cld5"),
+	PINCTRL_PIN(148, "lcd_cld6"),
+	PINCTRL_PIN(149, "lcd_cld7"),
+	PINCTRL_PIN(150, "lcd_cld8"),
+	PINCTRL_PIN(151, "lcd_cld9"),
+	PINCTRL_PIN(152, "lcd_clfp"),
+	PINCTRL_PIN(153, "lcd_clle"),
+	PINCTRL_PIN(154, "lcd_cllp"),
+	PINCTRL_PIN(155, "lcd_clpower"),
+	PINCTRL_PIN(156, "camera_vsync"),
+	PINCTRL_PIN(157, "camera_trigger"),
+	PINCTRL_PIN(158, "camera_strobe"),
+	PINCTRL_PIN(159, "camera_standby"),
+	PINCTRL_PIN(160, "camera_reset_n"),
+	PINCTRL_PIN(161, "camera_pixdata9"),
+	PINCTRL_PIN(162, "camera_pixdata8"),
+	PINCTRL_PIN(163, "camera_pixdata7"),
+	PINCTRL_PIN(164, "camera_pixdata6"),
+	PINCTRL_PIN(165, "camera_pixdata5"),
+	PINCTRL_PIN(166, "camera_pixdata4"),
+	PINCTRL_PIN(167, "camera_pixdata3"),
+	PINCTRL_PIN(168, "camera_pixdata2"),
+	PINCTRL_PIN(169, "camera_pixdata1"),
+	PINCTRL_PIN(170, "camera_pixdata0"),
+	PINCTRL_PIN(171, "camera_pixclk"),
+	PINCTRL_PIN(172, "camera_hsync"),
+	PINCTRL_PIN(173, "camera_pll_ref_clk"),
+	PINCTRL_PIN(174, "usb_id_indication"),
+	PINCTRL_PIN(175, "usb_vbus_indication"),
+	PINCTRL_PIN(176, "gpio0_3p3"),
+	PINCTRL_PIN(177, "gpio1_3p3"),
+	PINCTRL_PIN(178, "gpio2_3p3"),
+	PINCTRL_PIN(179, "gpio3_3p3"),
+};
+
+/*
+ * List of groups of pins
+ */
+static const unsigned gpio0_pins[] = { 12 };
+static const unsigned gpio1_pins[] = { 13 };
+static const unsigned gpio2_pins[] = { 14 };
+static const unsigned gpio3_pins[] = { 15 };
+static const unsigned gpio4_pins[] = { 16 };
+static const unsigned gpio5_pins[] = { 17 };
+static const unsigned gpio6_pins[] = { 18 };
+static const unsigned gpio7_pins[] = { 19 };
+static const unsigned gpio8_pins[] = { 20 };
+static const unsigned gpio9_pins[] = { 21 };
+static const unsigned gpio10_pins[] = { 22 };
+static const unsigned gpio11_pins[] = { 23 };
+static const unsigned gpio12_pins[] = { 24 };
+static const unsigned gpio13_pins[] = { 25 };
+static const unsigned gpio14_pins[] = { 26 };
+static const unsigned gpio15_pins[] = { 27 };
+static const unsigned gpio16_pins[] = { 28 };
+static const unsigned gpio17_pins[] = { 29 };
+static const unsigned gpio18_pins[] = { 30 };
+static const unsigned gpio19_pins[] = { 31 };
+static const unsigned gpio20_pins[] = { 32 };
+static const unsigned gpio21_pins[] = { 33 };
+static const unsigned gpio22_pins[] = { 34 };
+static const unsigned gpio23_pins[] = { 35 };
+static const unsigned pwm0_pins[] = { 38 };
+static const unsigned pwm1_pins[] = { 39 };
+static const unsigned pwm2_pins[] = { 40 };
+static const unsigned pwm3_pins[] = { 41 };
+static const unsigned sdio0_pins[] = { 94, 95, 96, 97, 98, 99 };
+static const unsigned smart_card0_pins[] = { 42, 43, 44, 46, 47 };
+static const unsigned smart_card1_pins[] = { 48, 49, 50, 52, 53 };
+static const unsigned spi0_pins[] = { 54, 55, 56, 57 };
+static const unsigned spi1_pins[] = { 58, 59, 60, 61 };
+static const unsigned spi2_pins[] = { 62, 63, 64, 65 };
+static const unsigned spi3_pins[] = { 66, 67, 68, 69 };
+static const unsigned d1w_pins[] = { 10, 11 };
+static const unsigned lcd_pins[] = { 126, 127, 128, 129, 130, 131, 132,	133,
+	134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147,
+	148, 149, 150, 151, 152, 153, 154, 155 };
+static const unsigned uart0_pins[] = { 70, 71, 72, 73 };
+static const unsigned uart1_dte_pins[] = { 75, 76, 77, 78 };
+static const unsigned uart1_pins[] = { 74, 79, 80, 81 };
+static const unsigned uart3_pins[] = { 82, 83 };
+static const unsigned qspi_pins[] = { 104, 105, 106, 107 };
+static const unsigned nand_pins[] = { 110, 111, 112, 113, 114, 115, 116, 117,
+	118, 119, 120, 121, 122, 123, 124, 125 };
+static const unsigned sdio0_cd_pins[] = { 103 };
+static const unsigned sdio0_mmc_pins[] = { 100, 101, 102 };
+static const unsigned can0_spi4_pins[] = { 86, 87 };
+static const unsigned can1_spi4_pins[] = { 88, 89 };
+static const unsigned sdio1_cd_pins[] = { 93 };
+static const unsigned sdio1_led_pins[] = { 84, 85 };
+static const unsigned sdio1_mmc_pins[] = { 90, 91, 92 };
+static const unsigned camera_led_pins[] = { 156, 157, 158, 159, 160 };
+static const unsigned camera_rgmii_pins[] = { 169, 170, 171, 169, 170, 171,
+	172, 173 };
+static const unsigned camera_sram_rgmii_pins[] = { 161, 162, 163, 164, 165,
+	166, 167, 168 };
+static const unsigned qspi_gpio_pins[] = { 108, 109 };
+static const unsigned smart_card0_fcb_pins[] = { 45 };
+static const unsigned smart_card1_fcb_pins[] = { 51 };
+static const unsigned gpio0_3p3_pins[] = { 176 };
+static const unsigned gpio1_3p3_pins[] = { 177 };
+static const unsigned gpio2_3p3_pins[] = { 178 };
+
+/*
+ * List of groups names. Need to match the order in cygnus_pin_groups
+ */
+static const char * const cygnus_pin_group_names[] = {
+	"gpio0",
+	"gpio1",
+	"gpio2",
+	"gpio3",
+	"gpio4",
+	"gpio5",
+	"gpio6",
+	"gpio7",
+	"gpio8",
+	"gpio9",
+	"gpio10",
+	"gpio11",
+	"gpio12",
+	"gpio13",
+	"gpio14",
+	"gpio15",
+	"gpio16",
+	"gpio17",
+	"gpio18",
+	"gpio19",
+	"gpio20",
+	"gpio21",
+	"gpio22",
+	"gpio23",
+	"pwm0",
+	"pwm1",
+	"pwm2",
+	"pwm3",
+	"sdio0",
+	"smart_card0",
+	"smart_card1",
+	"spi0",
+	"spi1",
+	"spi2",
+	"spi3",
+	"d1w",
+	"lcd",
+	"uart0",
+	"uart1_dte",
+	"uart1",
+	"uart3",
+	"qspi",
+	"nand",
+	"sdio0_cd",
+	"sdio0_mmc",
+	"can0_spi4",
+	"can1_spi4",
+	"sdio1_cd",
+	"sdio1_led",
+	"sdio1_mmc",
+	"camera_led",
+	"camera_rgmii",
+	"camera_sram_rgmii",
+	"qspi_gpio",
+	"smart_card0_fcb",
+	"smart_card1_fcb",
+	"gpio0_3p3",
+	"gpio1_3p3",
+	"gpio2_3p3",
+};
+
+/*
+ * List of groups. Need to match the order in cygnus_pin_group_names
+ */
+static const struct cygnus_pin_group cygnus_pin_groups[] = {
+	CYGNUS_PIN_GROUP(gpio0, 0x0, 0),
+	CYGNUS_PIN_GROUP(gpio1, 0x0, 4),
+	CYGNUS_PIN_GROUP(gpio2, 0x0, 8),
+	CYGNUS_PIN_GROUP(gpio3, 0x0, 12),
+	CYGNUS_PIN_GROUP(gpio4, 0x0, 16),
+	CYGNUS_PIN_GROUP(gpio5, 0x0, 20),
+	CYGNUS_PIN_GROUP(gpio6, 0x0, 24),
+	CYGNUS_PIN_GROUP(gpio7, 0x0, 28),
+	CYGNUS_PIN_GROUP(gpio8, 0x4, 0),
+	CYGNUS_PIN_GROUP(gpio9, 0x4, 4),
+	CYGNUS_PIN_GROUP(gpio10, 0x4, 8),
+	CYGNUS_PIN_GROUP(gpio11, 0x4, 12),
+	CYGNUS_PIN_GROUP(gpio12, 0x4, 16),
+	CYGNUS_PIN_GROUP(gpio13, 0x4, 20),
+	CYGNUS_PIN_GROUP(gpio14, 0x4, 24),
+	CYGNUS_PIN_GROUP(gpio15, 0x4, 28),
+	CYGNUS_PIN_GROUP(gpio16, 0x8, 0),
+	CYGNUS_PIN_GROUP(gpio17, 0x8, 4),
+	CYGNUS_PIN_GROUP(gpio18, 0x8, 8),
+	CYGNUS_PIN_GROUP(gpio19, 0x8, 12),
+	CYGNUS_PIN_GROUP(gpio20, 0x8, 16),
+	CYGNUS_PIN_GROUP(gpio21, 0x8, 20),
+	CYGNUS_PIN_GROUP(gpio22, 0x8, 24),
+	CYGNUS_PIN_GROUP(gpio23, 0x8, 28),
+	CYGNUS_PIN_GROUP(pwm0, 0xc, 0),
+	CYGNUS_PIN_GROUP(pwm1, 0xc, 4),
+	CYGNUS_PIN_GROUP(pwm2, 0xc, 8),
+	CYGNUS_PIN_GROUP(pwm3, 0xc, 12),
+	CYGNUS_PIN_GROUP(sdio0, 0xc, 16),
+	CYGNUS_PIN_GROUP(smart_card0, 0xc, 20),
+	CYGNUS_PIN_GROUP(smart_card1, 0xc, 24),
+	CYGNUS_PIN_GROUP(spi0, 0x10, 0),
+	CYGNUS_PIN_GROUP(spi1, 0x10, 4),
+	CYGNUS_PIN_GROUP(spi2, 0x10, 8),
+	CYGNUS_PIN_GROUP(spi3, 0x10, 12),
+	CYGNUS_PIN_GROUP(d1w, 0x10, 16),
+	CYGNUS_PIN_GROUP(lcd, 0x10, 20),
+	CYGNUS_PIN_GROUP(uart0, 0x14, 0),
+	CYGNUS_PIN_GROUP(uart1_dte, 0x14, 4),
+	CYGNUS_PIN_GROUP(uart1, 0x14, 8),
+	CYGNUS_PIN_GROUP(uart3, 0x14, 12),
+	CYGNUS_PIN_GROUP(qspi, 0x14, 16),
+	CYGNUS_PIN_GROUP(nand, 0x14, 20),
+	CYGNUS_PIN_GROUP(sdio0_cd, 0x18, 0),
+	CYGNUS_PIN_GROUP(sdio0_mmc, 0x18, 4),
+	CYGNUS_PIN_GROUP(can0_spi4, 0x18, 8),
+	CYGNUS_PIN_GROUP(can1_spi4, 0x18, 12),
+	CYGNUS_PIN_GROUP(sdio1_cd, 0x18, 16),
+	CYGNUS_PIN_GROUP(sdio1_led, 0x18, 20),
+	CYGNUS_PIN_GROUP(sdio1_mmc, 0x18, 24),
+	CYGNUS_PIN_GROUP(camera_led, 0x1c, 0),
+	CYGNUS_PIN_GROUP(camera_rgmii, 0x1c, 4),
+	CYGNUS_PIN_GROUP(camera_sram_rgmii, 0x1c, 8),
+	CYGNUS_PIN_GROUP(qspi_gpio, 0x1c, 12),
+	CYGNUS_PIN_GROUP(smart_card0_fcb, 0x20, 0),
+	CYGNUS_PIN_GROUP(smart_card1_fcb, 0x20, 4),
+	CYGNUS_PIN_GROUP(gpio0_3p3, 0x28, 0),
+	CYGNUS_PIN_GROUP(gpio1_3p3, 0x28, 4),
+	CYGNUS_PIN_GROUP(gpio2_3p3, 0x28, 8),
+};
+
+#define CYGNUS_PIN_FUNCTION(fcn_name, mux_val)			\
+{								\
+	.name = #fcn_name,					\
+	.group_names = cygnus_pin_group_names,			\
+	.num_groups = ARRAY_SIZE(cygnus_pin_group_names),	\
+	.mux = mux_val,						\
+}
+
+/*
+ * Cygnus has 4 alternate functions. All groups can be configured to any of
+ * the 4 alternate functions
+ */
+static const struct cygnus_pin_function cygnus_pin_functions[] = {
+	CYGNUS_PIN_FUNCTION(alt1, 0),
+	CYGNUS_PIN_FUNCTION(alt2, 1),
+	CYGNUS_PIN_FUNCTION(alt3, 2),
+	CYGNUS_PIN_FUNCTION(alt4, 3),
+};
+
+static int cygnus_get_groups_count(struct pinctrl_dev *pctrl_dev)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->num_groups;
+}
+
+static const char *cygnus_get_group_name(struct pinctrl_dev *pctrl_dev,
+		unsigned selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->groups[selector].name;
+}
+
+static int cygnus_get_group_pins(struct pinctrl_dev *pctrl_dev,
+		unsigned selector, const unsigned **pins,
+		unsigned *num_pins)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	*pins = pinctrl->groups[selector].pins;
+	*num_pins = pinctrl->groups[selector].num_pins;
+
+	return 0;
+}
+
+static void cygnus_pin_dbg_show(struct pinctrl_dev *pctrl_dev,
+		struct seq_file *s, unsigned offset)
+{
+	seq_printf(s, " %s", dev_name(pctrl_dev->dev));
+}
+
+static int find_matched_function(const char *function_name)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(cygnus_pin_functions); i++) {
+		if (!strcmp(cygnus_pin_functions[i].name, function_name))
+			return (int)cygnus_pin_functions[i].mux;
+	}
+
+	return -EINVAL;
+}
+
+static int cygnus_dt_node_to_map(struct pinctrl_dev *pctrl_dev,
+		struct device_node *np, struct pinctrl_map **map,
+		unsigned *num_maps)
+{
+	int ret, num_groups;
+	unsigned reserved_maps = 0;
+	struct property *prop;
+	const char *group_name, *function_name;
+
+	*map = NULL;
+	*num_maps = 0;
+
+	num_groups = of_property_count_strings(np, "brcm,groups");
+	if (num_groups < 0) {
+		dev_err(pctrl_dev->dev,
+			"could not parse property brcm,groups\n");
+		return -EINVAL;
+	}
+
+	ret = of_property_read_string(np, "brcm,function", &function_name);
+	if (ret < 0) {
+		dev_err(pctrl_dev->dev,
+			"could not parse property brcm,function\n");
+		return -EINVAL;
+	}
+
+	/* make sure it's a valid alternate function */
+	ret = find_matched_function(function_name);
+	if (ret < 0) {
+		dev_err(pctrl_dev->dev, "invalid function name: %s\n",
+				function_name);
+	}
+
+	ret = pinctrl_utils_reserve_map(pctrl_dev, map, &reserved_maps,
+			num_maps, num_groups);
+	if (ret) {
+		dev_err(pctrl_dev->dev, "unable to reserve map\n");
+		return ret;
+	}
+
+	of_property_for_each_string(np, "brcm,groups", prop, group_name) {
+		ret = pinctrl_utils_add_map_mux(pctrl_dev, map,
+				&reserved_maps, num_maps, group_name,
+				function_name);
+		if (ret) {
+			dev_err(pctrl_dev->dev, "can't add map: %d\n", ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static struct pinctrl_ops cygnus_pinctrl_ops = {
+	.get_groups_count = cygnus_get_groups_count,
+	.get_group_name = cygnus_get_group_name,
+	.get_group_pins = cygnus_get_group_pins,
+	.pin_dbg_show = cygnus_pin_dbg_show,
+	.dt_node_to_map = cygnus_dt_node_to_map,
+	.dt_free_map = pinctrl_utils_dt_free_map,
+};
+
+static int cygnus_get_functions_count(struct pinctrl_dev *pctrl_dev)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->num_functions;
+}
+
+static const char *cygnus_get_function_name(struct pinctrl_dev *pctrl_dev,
+		unsigned selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->functions[selector].name;
+}
+
+static int cygnus_get_function_groups(struct pinctrl_dev *pctrl_dev,
+	unsigned selector, const char * const **groups,
+	unsigned * const num_groups)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	*groups = pinctrl->functions[selector].group_names;
+	*num_groups = pinctrl->functions[selector].num_groups;
+
+	return 0;
+}
+
+static int cygnus_pinmux_set_mux(struct pinctrl_dev *pctrl_dev,
+		unsigned function_selector, unsigned group_selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+	const struct cygnus_pin_function *function =
+			&pinctrl->functions[function_selector];
+	const struct cygnus_pin_group *group =
+			&pinctrl->groups[group_selector];
+	u32 val, mask = 0x7;
+
+	dev_dbg(pctrl_dev->dev,
+	"group:%s with offset:0x%08x shift:%u set to function: %s mux:%u\n",
+		group->name, group->offset, group->shift, function->name,
+		function->mux);
+
+	val = readl(pinctrl->base + group->offset);
+	val &= ~(mask << group->shift);
+	val |= function->mux << group->shift;
+	writel(val, pinctrl->base + group->offset);
+
+	return 0;
+}
+
+static struct pinmux_ops cygnus_pinmux_ops = {
+	.get_functions_count = cygnus_get_functions_count,
+	.get_function_name = cygnus_get_function_name,
+	.get_function_groups = cygnus_get_function_groups,
+	.set_mux = cygnus_pinmux_set_mux,
+};
+
+static struct pinctrl_desc cygnus_pinctrl_desc = {
+	.pctlops = &cygnus_pinctrl_ops,
+	.pmxops = &cygnus_pinmux_ops,
+	.owner = THIS_MODULE,
+};
+
+static int cygnus_pinctrl_probe(struct platform_device *pdev)
+{
+	struct cygnus_pinctrl *pinctrl;
+	struct resource *res;
+
+	pinctrl = devm_kzalloc(&pdev->dev, sizeof(*pinctrl), GFP_KERNEL);
+	if (!pinctrl) {
+		dev_err(&pdev->dev, "unable to allocate memory\n");
+		return -ENOMEM;
+	}
+	pinctrl->dev = &pdev->dev;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "unable to get resource\n");
+		return -ENOENT;
+	}
+
+	pinctrl->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(pinctrl->base)) {
+		dev_err(&pdev->dev, "unable to map I/O space\n");
+		return PTR_ERR(pinctrl->base);
+	}
+
+	pinctrl->pins = cygnus_pinctrl_pins;
+	pinctrl->num_pins = ARRAY_SIZE(cygnus_pinctrl_pins);
+	pinctrl->groups = cygnus_pin_groups;
+	pinctrl->num_groups = ARRAY_SIZE(cygnus_pin_groups);
+	pinctrl->functions = cygnus_pin_functions;
+	pinctrl->num_functions = ARRAY_SIZE(cygnus_pin_functions);
+
+	cygnus_pinctrl_desc.name = dev_name(&pdev->dev);
+	cygnus_pinctrl_desc.pins = cygnus_pinctrl_pins;
+	cygnus_pinctrl_desc.npins = ARRAY_SIZE(cygnus_pinctrl_pins);
+
+	pinctrl->pctl = pinctrl_register(&cygnus_pinctrl_desc, &pdev->dev,
+			pinctrl);
+	if (!pinctrl->pctl) {
+		dev_err(&pdev->dev, "unable to register cygnus pinctrl\n");
+		return -EINVAL;
+	}
+
+	platform_set_drvdata(pdev, pinctrl);
+
+	return 0;
+}
+
+static int cygnus_pinctrl_remove(struct platform_device *pdev)
+{
+	struct cygnus_pinctrl *pinctrl = platform_get_drvdata(pdev);
+
+	pinctrl_unregister(pinctrl->pctl);
+	platform_set_drvdata(pdev, NULL);
+
+	return 0;
+}
+
+static struct of_device_id cygnus_pinctrl_of_match[] = {
+	{ .compatible = "brcm,cygnus-pinctrl", },
+	{ },
+};
+
+static struct platform_driver cygnus_pinctrl_driver = {
+	.driver = {
+		.name = "cygnus-pinctrl",
+		.owner = THIS_MODULE,
+		.of_match_table = cygnus_pinctrl_of_match,
+	},
+	.probe = cygnus_pinctrl_probe,
+	.remove = cygnus_pinctrl_remove,
+};
+
+static int __init cygnus_pinctrl_init(void)
+{
+	return platform_driver_register(&cygnus_pinctrl_driver);
+}
+arch_initcall(cygnus_pinctrl_init);
+
+static void __exit cygnus_pinctrl_exit(void)
+{
+	platform_driver_unregister(&cygnus_pinctrl_driver);
+}
+module_exit(cygnus_pinctrl_exit);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus pinctrl driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v2 2/4] pinctrl: cygnus: add initial pinctrl support

[Ray Jui]

This adds the initial driver support for the Broadcom Cygnus pinctrl
controller. The Cygnus pinctrl controller supports group based
alternate function configuration

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
---
 drivers/pinctrl/Kconfig              |    7 +
 drivers/pinctrl/Makefile             |    1 +
 drivers/pinctrl/pinctrl-bcm-cygnus.c |  753 ++++++++++++++++++++++++++++++++++
 3 files changed, 761 insertions(+)
 create mode 100644 drivers/pinctrl/pinctrl-bcm-cygnus.c

diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index d014f22..4549e9f 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -85,6 +85,13 @@ config PINCTRL_BCM281XX
 	  BCM28145, and BCM28155 SoCs.  This driver requires the pinctrl
 	  framework.  GPIO is provided by a separate GPIO driver.
 
+config PINCTRL_BCM_CYGNUS
+	bool "Broadcom Cygnus pinctrl driver"
+	depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
+	select PINMUX
+	select PINCONF
+	select GENERIC_PINCONF
+
 config PINCTRL_LANTIQ
 	bool
 	depends on LANTIQ
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index c030b3d..4ed8e8a 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_PINCTRL_BF60x)	+= pinctrl-adi2-bf60x.o
 obj-$(CONFIG_PINCTRL_AT91)	+= pinctrl-at91.o
 obj-$(CONFIG_PINCTRL_BCM2835)	+= pinctrl-bcm2835.o
 obj-$(CONFIG_PINCTRL_BCM281XX)	+= pinctrl-bcm281xx.o
+obj-$(CONFIG_PINCTRL_BCM_CYGNUS)	+= pinctrl-bcm-cygnus.o
 obj-$(CONFIG_PINCTRL_FALCON)	+= pinctrl-falcon.o
 obj-$(CONFIG_PINCTRL_PALMAS)	+= pinctrl-palmas.o
 obj-$(CONFIG_PINCTRL_ROCKCHIP)	+= pinctrl-rockchip.o
diff --git a/drivers/pinctrl/pinctrl-bcm-cygnus.c b/drivers/pinctrl/pinctrl-bcm-cygnus.c
new file mode 100644
index 0000000..eb6e27a
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-bcm-cygnus.c
@@ -0,0 +1,753 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/slab.h>
+
+#include "core.h"
+#include "pinctrl-utils.h"
+
+/*
+ * Alternate function configuration
+ *
+ * @name: name of the alternate function
+ * @group_names: array of strings of group names that can be supported by this
+ * alternate function
+ * @num_groups: total number of groups that can be supported by this alternate
+ * function
+ * @mux: mux setting for this alternate function to be programed
+ */
+struct cygnus_pin_function {
+	const char *name;
+	const char * const *group_names;
+	const unsigned num_groups;
+	unsigned int mux;
+};
+
+/*
+ * Cygnus allows group based pinmux configuration
+ *
+ * @name: name of the group
+ * @pins: array of pins used by this group
+ * @num_pins: total number of pins used by this group
+ * @offset: register offset for pinmux configuration of this group
+ * @shift: bit shift for pinmux configuration of this group
+ */
+struct cygnus_pin_group {
+	const char *name;
+	const unsigned *pins;
+	const unsigned num_pins;
+	const unsigned int offset;
+	const unsigned int shift;
+};
+
+/*
+ * Cygnus pinctrl core
+ *
+ * @pctl: pointer to pinctrl_dev
+ * @dev: pointer to the device
+ * @base: I/O register base for Cygnus pinctrl configuration
+ *
+ */
+struct cygnus_pinctrl {
+	struct pinctrl_dev *pctl;
+	struct device *dev;
+	void __iomem *base;
+
+	const struct pinctrl_pin_desc *pins;
+	unsigned num_pins;
+
+	const struct cygnus_pin_group *groups;
+	unsigned num_groups;
+
+	const struct cygnus_pin_function *functions;
+	unsigned num_functions;
+};
+
+#define CYGNUS_PIN_GROUP(group_name, off, sh)		\
+{							\
+	.name = #group_name,				\
+	.pins = group_name##_pins,			\
+	.num_pins = ARRAY_SIZE(group_name##_pins),	\
+	.offset = off,					\
+	.shift = sh,					\
+}
+
+/*
+ * The following pin description is based on Cygnus I/O MUX spreadsheet
+ */
+static const struct pinctrl_pin_desc cygnus_pinctrl_pins[] = {
+	PINCTRL_PIN(0, "ext_device_reset_n"),
+	PINCTRL_PIN(1, "chip_mode0"),
+	PINCTRL_PIN(2, "chip_mode1"),
+	PINCTRL_PIN(3, "chip_mode2"),
+	PINCTRL_PIN(4, "chip_mode3"),
+	PINCTRL_PIN(5, "chip_mode4"),
+	PINCTRL_PIN(6, "bsc0_scl"),
+	PINCTRL_PIN(7, "bsc0_sda"),
+	PINCTRL_PIN(8, "bsc1_scl"),
+	PINCTRL_PIN(9, "bsc1_sda"),
+	PINCTRL_PIN(10, "d1w_dq"),
+	PINCTRL_PIN(11, "d1wowstz_l"),
+	PINCTRL_PIN(12, "gpio0"),
+	PINCTRL_PIN(13, "gpio1"),
+	PINCTRL_PIN(14, "gpio2"),
+	PINCTRL_PIN(15, "gpio3"),
+	PINCTRL_PIN(16, "gpio4"),
+	PINCTRL_PIN(17, "gpio5"),
+	PINCTRL_PIN(18, "gpio6"),
+	PINCTRL_PIN(19, "gpio7"),
+	PINCTRL_PIN(20, "gpio8"),
+	PINCTRL_PIN(21, "gpio9"),
+	PINCTRL_PIN(22, "gpio10"),
+	PINCTRL_PIN(23, "gpio11"),
+	PINCTRL_PIN(24, "gpio12"),
+	PINCTRL_PIN(25, "gpio13"),
+	PINCTRL_PIN(26, "gpio14"),
+	PINCTRL_PIN(27, "gpio15"),
+	PINCTRL_PIN(28, "gpio16"),
+	PINCTRL_PIN(29, "gpio17"),
+	PINCTRL_PIN(30, "gpio18"),
+	PINCTRL_PIN(31, "gpio19"),
+	PINCTRL_PIN(32, "gpio20"),
+	PINCTRL_PIN(33, "gpio21"),
+	PINCTRL_PIN(34, "gpio22"),
+	PINCTRL_PIN(35, "gpio23"),
+	PINCTRL_PIN(36, "mdc"),
+	PINCTRL_PIN(37, "mdio"),
+	PINCTRL_PIN(38, "pwm0"),
+	PINCTRL_PIN(39, "pwm1"),
+	PINCTRL_PIN(40, "pwm2"),
+	PINCTRL_PIN(41, "pwm3"),
+	PINCTRL_PIN(42, "sc0_clk"),
+	PINCTRL_PIN(43, "sc0_cmdvcc_l"),
+	PINCTRL_PIN(44, "sc0_detect"),
+	PINCTRL_PIN(45, "sc0_fcb"),
+	PINCTRL_PIN(46, "sc0_io"),
+	PINCTRL_PIN(47, "sc0_rst_l"),
+	PINCTRL_PIN(48, "sc1_clk"),
+	PINCTRL_PIN(49, "sc1_cmdvcc_l"),
+	PINCTRL_PIN(50, "sc1_detect"),
+	PINCTRL_PIN(51, "sc1_fcb"),
+	PINCTRL_PIN(52, "sc1_io"),
+	PINCTRL_PIN(53, "sc1_rst_l"),
+	PINCTRL_PIN(54, "spi0_clk"),
+	PINCTRL_PIN(55, "spi0_mosi"),
+	PINCTRL_PIN(56, "spi0_miso"),
+	PINCTRL_PIN(57, "spi0_ss"),
+	PINCTRL_PIN(58, "spi1_clk"),
+	PINCTRL_PIN(59, "spi1_mosi"),
+	PINCTRL_PIN(60, "spi1_miso"),
+	PINCTRL_PIN(61, "spi1_ss"),
+	PINCTRL_PIN(62, "spi2_clk"),
+	PINCTRL_PIN(63, "spi2_mosi"),
+	PINCTRL_PIN(64, "spi2_miso"),
+	PINCTRL_PIN(65, "spi2_ss"),
+	PINCTRL_PIN(66, "spi3_clk"),
+	PINCTRL_PIN(67, "spi3_mosi"),
+	PINCTRL_PIN(68, "spi3_miso"),
+	PINCTRL_PIN(69, "spi3_ss"),
+	PINCTRL_PIN(70, "uart0_cts"),
+	PINCTRL_PIN(71, "uart0_rts"),
+	PINCTRL_PIN(72, "uart0_rx"),
+	PINCTRL_PIN(73, "uart0_tx"),
+	PINCTRL_PIN(74, "uart1_cts"),
+	PINCTRL_PIN(75, "uart1_dcd"),
+	PINCTRL_PIN(76, "uart1_dsr"),
+	PINCTRL_PIN(77, "uart1_dtr"),
+	PINCTRL_PIN(78, "uart1_ri"),
+	PINCTRL_PIN(79, "uart1_rts"),
+	PINCTRL_PIN(80, "uart1_rx"),
+	PINCTRL_PIN(81, "uart1_tx"),
+	PINCTRL_PIN(82, "uart3_rx"),
+	PINCTRL_PIN(83, "uart3_tx"),
+	PINCTRL_PIN(84, "sdio1_clk_sdcard"),
+	PINCTRL_PIN(85, "sdio1_cmd"),
+	PINCTRL_PIN(86, "sdio1_data0"),
+	PINCTRL_PIN(87, "sdio1_data1"),
+	PINCTRL_PIN(88, "sdio1_data2"),
+	PINCTRL_PIN(89, "sdio1_data3"),
+	PINCTRL_PIN(90, "sdio1_wp_n"),
+	PINCTRL_PIN(91, "sdio1_card_rst"),
+	PINCTRL_PIN(92, "sdio1_led_on"),
+	PINCTRL_PIN(93, "sdio1_cd"),
+	PINCTRL_PIN(94, "sdio0_clk_sdcard"),
+	PINCTRL_PIN(95, "sdio0_cmd"),
+	PINCTRL_PIN(96, "sdio0_data0"),
+	PINCTRL_PIN(97, "sdio0_data1"),
+	PINCTRL_PIN(98, "sdio0_data2"),
+	PINCTRL_PIN(99, "sdio0_data3"),
+	PINCTRL_PIN(100, "sdio0_wp_n"),
+	PINCTRL_PIN(101, "sdio0_card_rst"),
+	PINCTRL_PIN(102, "sdio0_led_on"),
+	PINCTRL_PIN(103, "sdio0_cd"),
+	PINCTRL_PIN(104, "sflash_clk"),
+	PINCTRL_PIN(105, "sflash_cs_l"),
+	PINCTRL_PIN(106, "sflash_mosi"),
+	PINCTRL_PIN(107, "sflash_miso"),
+	PINCTRL_PIN(108, "sflash_wp_n"),
+	PINCTRL_PIN(109, "sflash_hold_n"),
+	PINCTRL_PIN(110, "nand_ale"),
+	PINCTRL_PIN(111, "nand_ce0_l"),
+	PINCTRL_PIN(112, "nand_ce1_l"),
+	PINCTRL_PIN(113, "nand_cle"),
+	PINCTRL_PIN(114, "nand_dq0"),
+	PINCTRL_PIN(115, "nand_dq1"),
+	PINCTRL_PIN(116, "nand_dq2"),
+	PINCTRL_PIN(117, "nand_dq3"),
+	PINCTRL_PIN(118, "nand_dq4"),
+	PINCTRL_PIN(119, "nand_dq5"),
+	PINCTRL_PIN(120, "nand_dq6"),
+	PINCTRL_PIN(121, "nand_dq7"),
+	PINCTRL_PIN(122, "nand_rb_l"),
+	PINCTRL_PIN(123, "nand_re_l"),
+	PINCTRL_PIN(124, "nand_we_l"),
+	PINCTRL_PIN(125, "nand_wp_l"),
+	PINCTRL_PIN(126, "lcd_clac"),
+	PINCTRL_PIN(127, "lcd_clcp"),
+	PINCTRL_PIN(128, "lcd_cld0"),
+	PINCTRL_PIN(129, "lcd_cld1"),
+	PINCTRL_PIN(130, "lcd_cld10"),
+	PINCTRL_PIN(131, "lcd_cld11"),
+	PINCTRL_PIN(132, "lcd_cld12"),
+	PINCTRL_PIN(133, "lcd_cld13"),
+	PINCTRL_PIN(134, "lcd_cld14"),
+	PINCTRL_PIN(135, "lcd_cld15"),
+	PINCTRL_PIN(136, "lcd_cld16"),
+	PINCTRL_PIN(137, "lcd_cld17"),
+	PINCTRL_PIN(138, "lcd_cld18"),
+	PINCTRL_PIN(139, "lcd_cld19"),
+	PINCTRL_PIN(140, "lcd_cld2"),
+	PINCTRL_PIN(141, "lcd_cld20"),
+	PINCTRL_PIN(142, "lcd_cld21"),
+	PINCTRL_PIN(143, "lcd_cld22"),
+	PINCTRL_PIN(144, "lcd_cld23"),
+	PINCTRL_PIN(145, "lcd_cld3"),
+	PINCTRL_PIN(146, "lcd_cld4"),
+	PINCTRL_PIN(147, "lcd_cld5"),
+	PINCTRL_PIN(148, "lcd_cld6"),
+	PINCTRL_PIN(149, "lcd_cld7"),
+	PINCTRL_PIN(150, "lcd_cld8"),
+	PINCTRL_PIN(151, "lcd_cld9"),
+	PINCTRL_PIN(152, "lcd_clfp"),
+	PINCTRL_PIN(153, "lcd_clle"),
+	PINCTRL_PIN(154, "lcd_cllp"),
+	PINCTRL_PIN(155, "lcd_clpower"),
+	PINCTRL_PIN(156, "camera_vsync"),
+	PINCTRL_PIN(157, "camera_trigger"),
+	PINCTRL_PIN(158, "camera_strobe"),
+	PINCTRL_PIN(159, "camera_standby"),
+	PINCTRL_PIN(160, "camera_reset_n"),
+	PINCTRL_PIN(161, "camera_pixdata9"),
+	PINCTRL_PIN(162, "camera_pixdata8"),
+	PINCTRL_PIN(163, "camera_pixdata7"),
+	PINCTRL_PIN(164, "camera_pixdata6"),
+	PINCTRL_PIN(165, "camera_pixdata5"),
+	PINCTRL_PIN(166, "camera_pixdata4"),
+	PINCTRL_PIN(167, "camera_pixdata3"),
+	PINCTRL_PIN(168, "camera_pixdata2"),
+	PINCTRL_PIN(169, "camera_pixdata1"),
+	PINCTRL_PIN(170, "camera_pixdata0"),
+	PINCTRL_PIN(171, "camera_pixclk"),
+	PINCTRL_PIN(172, "camera_hsync"),
+	PINCTRL_PIN(173, "camera_pll_ref_clk"),
+	PINCTRL_PIN(174, "usb_id_indication"),
+	PINCTRL_PIN(175, "usb_vbus_indication"),
+	PINCTRL_PIN(176, "gpio0_3p3"),
+	PINCTRL_PIN(177, "gpio1_3p3"),
+	PINCTRL_PIN(178, "gpio2_3p3"),
+	PINCTRL_PIN(179, "gpio3_3p3"),
+};
+
+/*
+ * List of groups of pins
+ */
+static const unsigned gpio0_pins[] = { 12 };
+static const unsigned gpio1_pins[] = { 13 };
+static const unsigned gpio2_pins[] = { 14 };
+static const unsigned gpio3_pins[] = { 15 };
+static const unsigned gpio4_pins[] = { 16 };
+static const unsigned gpio5_pins[] = { 17 };
+static const unsigned gpio6_pins[] = { 18 };
+static const unsigned gpio7_pins[] = { 19 };
+static const unsigned gpio8_pins[] = { 20 };
+static const unsigned gpio9_pins[] = { 21 };
+static const unsigned gpio10_pins[] = { 22 };
+static const unsigned gpio11_pins[] = { 23 };
+static const unsigned gpio12_pins[] = { 24 };
+static const unsigned gpio13_pins[] = { 25 };
+static const unsigned gpio14_pins[] = { 26 };
+static const unsigned gpio15_pins[] = { 27 };
+static const unsigned gpio16_pins[] = { 28 };
+static const unsigned gpio17_pins[] = { 29 };
+static const unsigned gpio18_pins[] = { 30 };
+static const unsigned gpio19_pins[] = { 31 };
+static const unsigned gpio20_pins[] = { 32 };
+static const unsigned gpio21_pins[] = { 33 };
+static const unsigned gpio22_pins[] = { 34 };
+static const unsigned gpio23_pins[] = { 35 };
+static const unsigned pwm0_pins[] = { 38 };
+static const unsigned pwm1_pins[] = { 39 };
+static const unsigned pwm2_pins[] = { 40 };
+static const unsigned pwm3_pins[] = { 41 };
+static const unsigned sdio0_pins[] = { 94, 95, 96, 97, 98, 99 };
+static const unsigned smart_card0_pins[] = { 42, 43, 44, 46, 47 };
+static const unsigned smart_card1_pins[] = { 48, 49, 50, 52, 53 };
+static const unsigned spi0_pins[] = { 54, 55, 56, 57 };
+static const unsigned spi1_pins[] = { 58, 59, 60, 61 };
+static const unsigned spi2_pins[] = { 62, 63, 64, 65 };
+static const unsigned spi3_pins[] = { 66, 67, 68, 69 };
+static const unsigned d1w_pins[] = { 10, 11 };
+static const unsigned lcd_pins[] = { 126, 127, 128, 129, 130, 131, 132,	133,
+	134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147,
+	148, 149, 150, 151, 152, 153, 154, 155 };
+static const unsigned uart0_pins[] = { 70, 71, 72, 73 };
+static const unsigned uart1_dte_pins[] = { 75, 76, 77, 78 };
+static const unsigned uart1_pins[] = { 74, 79, 80, 81 };
+static const unsigned uart3_pins[] = { 82, 83 };
+static const unsigned qspi_pins[] = { 104, 105, 106, 107 };
+static const unsigned nand_pins[] = { 110, 111, 112, 113, 114, 115, 116, 117,
+	118, 119, 120, 121, 122, 123, 124, 125 };
+static const unsigned sdio0_cd_pins[] = { 103 };
+static const unsigned sdio0_mmc_pins[] = { 100, 101, 102 };
+static const unsigned can0_spi4_pins[] = { 86, 87 };
+static const unsigned can1_spi4_pins[] = { 88, 89 };
+static const unsigned sdio1_cd_pins[] = { 93 };
+static const unsigned sdio1_led_pins[] = { 84, 85 };
+static const unsigned sdio1_mmc_pins[] = { 90, 91, 92 };
+static const unsigned camera_led_pins[] = { 156, 157, 158, 159, 160 };
+static const unsigned camera_rgmii_pins[] = { 169, 170, 171, 169, 170, 171,
+	172, 173 };
+static const unsigned camera_sram_rgmii_pins[] = { 161, 162, 163, 164, 165,
+	166, 167, 168 };
+static const unsigned qspi_gpio_pins[] = { 108, 109 };
+static const unsigned smart_card0_fcb_pins[] = { 45 };
+static const unsigned smart_card1_fcb_pins[] = { 51 };
+static const unsigned gpio0_3p3_pins[] = { 176 };
+static const unsigned gpio1_3p3_pins[] = { 177 };
+static const unsigned gpio2_3p3_pins[] = { 178 };
+
+/*
+ * List of groups names. Need to match the order in cygnus_pin_groups
+ */
+static const char * const cygnus_pin_group_names[] = {
+	"gpio0",
+	"gpio1",
+	"gpio2",
+	"gpio3",
+	"gpio4",
+	"gpio5",
+	"gpio6",
+	"gpio7",
+	"gpio8",
+	"gpio9",
+	"gpio10",
+	"gpio11",
+	"gpio12",
+	"gpio13",
+	"gpio14",
+	"gpio15",
+	"gpio16",
+	"gpio17",
+	"gpio18",
+	"gpio19",
+	"gpio20",
+	"gpio21",
+	"gpio22",
+	"gpio23",
+	"pwm0",
+	"pwm1",
+	"pwm2",
+	"pwm3",
+	"sdio0",
+	"smart_card0",
+	"smart_card1",
+	"spi0",
+	"spi1",
+	"spi2",
+	"spi3",
+	"d1w",
+	"lcd",
+	"uart0",
+	"uart1_dte",
+	"uart1",
+	"uart3",
+	"qspi",
+	"nand",
+	"sdio0_cd",
+	"sdio0_mmc",
+	"can0_spi4",
+	"can1_spi4",
+	"sdio1_cd",
+	"sdio1_led",
+	"sdio1_mmc",
+	"camera_led",
+	"camera_rgmii",
+	"camera_sram_rgmii",
+	"qspi_gpio",
+	"smart_card0_fcb",
+	"smart_card1_fcb",
+	"gpio0_3p3",
+	"gpio1_3p3",
+	"gpio2_3p3",
+};
+
+/*
+ * List of groups. Need to match the order in cygnus_pin_group_names
+ */
+static const struct cygnus_pin_group cygnus_pin_groups[] = {
+	CYGNUS_PIN_GROUP(gpio0, 0x0, 0),
+	CYGNUS_PIN_GROUP(gpio1, 0x0, 4),
+	CYGNUS_PIN_GROUP(gpio2, 0x0, 8),
+	CYGNUS_PIN_GROUP(gpio3, 0x0, 12),
+	CYGNUS_PIN_GROUP(gpio4, 0x0, 16),
+	CYGNUS_PIN_GROUP(gpio5, 0x0, 20),
+	CYGNUS_PIN_GROUP(gpio6, 0x0, 24),
+	CYGNUS_PIN_GROUP(gpio7, 0x0, 28),
+	CYGNUS_PIN_GROUP(gpio8, 0x4, 0),
+	CYGNUS_PIN_GROUP(gpio9, 0x4, 4),
+	CYGNUS_PIN_GROUP(gpio10, 0x4, 8),
+	CYGNUS_PIN_GROUP(gpio11, 0x4, 12),
+	CYGNUS_PIN_GROUP(gpio12, 0x4, 16),
+	CYGNUS_PIN_GROUP(gpio13, 0x4, 20),
+	CYGNUS_PIN_GROUP(gpio14, 0x4, 24),
+	CYGNUS_PIN_GROUP(gpio15, 0x4, 28),
+	CYGNUS_PIN_GROUP(gpio16, 0x8, 0),
+	CYGNUS_PIN_GROUP(gpio17, 0x8, 4),
+	CYGNUS_PIN_GROUP(gpio18, 0x8, 8),
+	CYGNUS_PIN_GROUP(gpio19, 0x8, 12),
+	CYGNUS_PIN_GROUP(gpio20, 0x8, 16),
+	CYGNUS_PIN_GROUP(gpio21, 0x8, 20),
+	CYGNUS_PIN_GROUP(gpio22, 0x8, 24),
+	CYGNUS_PIN_GROUP(gpio23, 0x8, 28),
+	CYGNUS_PIN_GROUP(pwm0, 0xc, 0),
+	CYGNUS_PIN_GROUP(pwm1, 0xc, 4),
+	CYGNUS_PIN_GROUP(pwm2, 0xc, 8),
+	CYGNUS_PIN_GROUP(pwm3, 0xc, 12),
+	CYGNUS_PIN_GROUP(sdio0, 0xc, 16),
+	CYGNUS_PIN_GROUP(smart_card0, 0xc, 20),
+	CYGNUS_PIN_GROUP(smart_card1, 0xc, 24),
+	CYGNUS_PIN_GROUP(spi0, 0x10, 0),
+	CYGNUS_PIN_GROUP(spi1, 0x10, 4),
+	CYGNUS_PIN_GROUP(spi2, 0x10, 8),
+	CYGNUS_PIN_GROUP(spi3, 0x10, 12),
+	CYGNUS_PIN_GROUP(d1w, 0x10, 16),
+	CYGNUS_PIN_GROUP(lcd, 0x10, 20),
+	CYGNUS_PIN_GROUP(uart0, 0x14, 0),
+	CYGNUS_PIN_GROUP(uart1_dte, 0x14, 4),
+	CYGNUS_PIN_GROUP(uart1, 0x14, 8),
+	CYGNUS_PIN_GROUP(uart3, 0x14, 12),
+	CYGNUS_PIN_GROUP(qspi, 0x14, 16),
+	CYGNUS_PIN_GROUP(nand, 0x14, 20),
+	CYGNUS_PIN_GROUP(sdio0_cd, 0x18, 0),
+	CYGNUS_PIN_GROUP(sdio0_mmc, 0x18, 4),
+	CYGNUS_PIN_GROUP(can0_spi4, 0x18, 8),
+	CYGNUS_PIN_GROUP(can1_spi4, 0x18, 12),
+	CYGNUS_PIN_GROUP(sdio1_cd, 0x18, 16),
+	CYGNUS_PIN_GROUP(sdio1_led, 0x18, 20),
+	CYGNUS_PIN_GROUP(sdio1_mmc, 0x18, 24),
+	CYGNUS_PIN_GROUP(camera_led, 0x1c, 0),
+	CYGNUS_PIN_GROUP(camera_rgmii, 0x1c, 4),
+	CYGNUS_PIN_GROUP(camera_sram_rgmii, 0x1c, 8),
+	CYGNUS_PIN_GROUP(qspi_gpio, 0x1c, 12),
+	CYGNUS_PIN_GROUP(smart_card0_fcb, 0x20, 0),
+	CYGNUS_PIN_GROUP(smart_card1_fcb, 0x20, 4),
+	CYGNUS_PIN_GROUP(gpio0_3p3, 0x28, 0),
+	CYGNUS_PIN_GROUP(gpio1_3p3, 0x28, 4),
+	CYGNUS_PIN_GROUP(gpio2_3p3, 0x28, 8),
+};
+
+#define CYGNUS_PIN_FUNCTION(fcn_name, mux_val)			\
+{								\
+	.name = #fcn_name,					\
+	.group_names = cygnus_pin_group_names,			\
+	.num_groups = ARRAY_SIZE(cygnus_pin_group_names),	\
+	.mux = mux_val,						\
+}
+
+/*
+ * Cygnus has 4 alternate functions. All groups can be configured to any of
+ * the 4 alternate functions
+ */
+static const struct cygnus_pin_function cygnus_pin_functions[] = {
+	CYGNUS_PIN_FUNCTION(alt1, 0),
+	CYGNUS_PIN_FUNCTION(alt2, 1),
+	CYGNUS_PIN_FUNCTION(alt3, 2),
+	CYGNUS_PIN_FUNCTION(alt4, 3),
+};
+
+static int cygnus_get_groups_count(struct pinctrl_dev *pctrl_dev)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->num_groups;
+}
+
+static const char *cygnus_get_group_name(struct pinctrl_dev *pctrl_dev,
+		unsigned selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->groups[selector].name;
+}
+
+static int cygnus_get_group_pins(struct pinctrl_dev *pctrl_dev,
+		unsigned selector, const unsigned **pins,
+		unsigned *num_pins)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	*pins = pinctrl->groups[selector].pins;
+	*num_pins = pinctrl->groups[selector].num_pins;
+
+	return 0;
+}
+
+static void cygnus_pin_dbg_show(struct pinctrl_dev *pctrl_dev,
+		struct seq_file *s, unsigned offset)
+{
+	seq_printf(s, " %s", dev_name(pctrl_dev->dev));
+}
+
+static int find_matched_function(const char *function_name)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(cygnus_pin_functions); i++) {
+		if (!strcmp(cygnus_pin_functions[i].name, function_name))
+			return (int)cygnus_pin_functions[i].mux;
+	}
+
+	return -EINVAL;
+}
+
+static int cygnus_dt_node_to_map(struct pinctrl_dev *pctrl_dev,
+		struct device_node *np, struct pinctrl_map **map,
+		unsigned *num_maps)
+{
+	int ret, num_groups;
+	unsigned reserved_maps = 0;
+	struct property *prop;
+	const char *group_name, *function_name;
+
+	*map = NULL;
+	*num_maps = 0;
+
+	num_groups = of_property_count_strings(np, "brcm,groups");
+	if (num_groups < 0) {
+		dev_err(pctrl_dev->dev,
+			"could not parse property brcm,groups\n");
+		return -EINVAL;
+	}
+
+	ret = of_property_read_string(np, "brcm,function", &function_name);
+	if (ret < 0) {
+		dev_err(pctrl_dev->dev,
+			"could not parse property brcm,function\n");
+		return -EINVAL;
+	}
+
+	/* make sure it's a valid alternate function */
+	ret = find_matched_function(function_name);
+	if (ret < 0) {
+		dev_err(pctrl_dev->dev, "invalid function name: %s\n",
+				function_name);
+	}
+
+	ret = pinctrl_utils_reserve_map(pctrl_dev, map, &reserved_maps,
+			num_maps, num_groups);
+	if (ret) {
+		dev_err(pctrl_dev->dev, "unable to reserve map\n");
+		return ret;
+	}
+
+	of_property_for_each_string(np, "brcm,groups", prop, group_name) {
+		ret = pinctrl_utils_add_map_mux(pctrl_dev, map,
+				&reserved_maps, num_maps, group_name,
+				function_name);
+		if (ret) {
+			dev_err(pctrl_dev->dev, "can't add map: %d\n", ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static struct pinctrl_ops cygnus_pinctrl_ops = {
+	.get_groups_count = cygnus_get_groups_count,
+	.get_group_name = cygnus_get_group_name,
+	.get_group_pins = cygnus_get_group_pins,
+	.pin_dbg_show = cygnus_pin_dbg_show,
+	.dt_node_to_map = cygnus_dt_node_to_map,
+	.dt_free_map = pinctrl_utils_dt_free_map,
+};
+
+static int cygnus_get_functions_count(struct pinctrl_dev *pctrl_dev)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->num_functions;
+}
+
+static const char *cygnus_get_function_name(struct pinctrl_dev *pctrl_dev,
+		unsigned selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->functions[selector].name;
+}
+
+static int cygnus_get_function_groups(struct pinctrl_dev *pctrl_dev,
+	unsigned selector, const char * const **groups,
+	unsigned * const num_groups)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	*groups = pinctrl->functions[selector].group_names;
+	*num_groups = pinctrl->functions[selector].num_groups;
+
+	return 0;
+}
+
+static int cygnus_pinmux_set_mux(struct pinctrl_dev *pctrl_dev,
+		unsigned function_selector, unsigned group_selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+	const struct cygnus_pin_function *function =
+			&pinctrl->functions[function_selector];
+	const struct cygnus_pin_group *group =
+			&pinctrl->groups[group_selector];
+	u32 val, mask = 0x7;
+
+	dev_dbg(pctrl_dev->dev,
+	"group:%s with offset:0x%08x shift:%u set to function: %s mux:%u\n",
+		group->name, group->offset, group->shift, function->name,
+		function->mux);
+
+	val = readl(pinctrl->base + group->offset);
+	val &= ~(mask << group->shift);
+	val |= function->mux << group->shift;
+	writel(val, pinctrl->base + group->offset);
+
+	return 0;
+}
+
+static struct pinmux_ops cygnus_pinmux_ops = {
+	.get_functions_count = cygnus_get_functions_count,
+	.get_function_name = cygnus_get_function_name,
+	.get_function_groups = cygnus_get_function_groups,
+	.set_mux = cygnus_pinmux_set_mux,
+};
+
+static struct pinctrl_desc cygnus_pinctrl_desc = {
+	.pctlops = &cygnus_pinctrl_ops,
+	.pmxops = &cygnus_pinmux_ops,
+	.owner = THIS_MODULE,
+};
+
+static int cygnus_pinctrl_probe(struct platform_device *pdev)
+{
+	struct cygnus_pinctrl *pinctrl;
+	struct resource *res;
+
+	pinctrl = devm_kzalloc(&pdev->dev, sizeof(*pinctrl), GFP_KERNEL);
+	if (!pinctrl) {
+		dev_err(&pdev->dev, "unable to allocate memory\n");
+		return -ENOMEM;
+	}
+	pinctrl->dev = &pdev->dev;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "unable to get resource\n");
+		return -ENOENT;
+	}
+
+	pinctrl->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(pinctrl->base)) {
+		dev_err(&pdev->dev, "unable to map I/O space\n");
+		return PTR_ERR(pinctrl->base);
+	}
+
+	pinctrl->pins = cygnus_pinctrl_pins;
+	pinctrl->num_pins = ARRAY_SIZE(cygnus_pinctrl_pins);
+	pinctrl->groups = cygnus_pin_groups;
+	pinctrl->num_groups = ARRAY_SIZE(cygnus_pin_groups);
+	pinctrl->functions = cygnus_pin_functions;
+	pinctrl->num_functions = ARRAY_SIZE(cygnus_pin_functions);
+
+	cygnus_pinctrl_desc.name = dev_name(&pdev->dev);
+	cygnus_pinctrl_desc.pins = cygnus_pinctrl_pins;
+	cygnus_pinctrl_desc.npins = ARRAY_SIZE(cygnus_pinctrl_pins);
+
+	pinctrl->pctl = pinctrl_register(&cygnus_pinctrl_desc, &pdev->dev,
+			pinctrl);
+	if (!pinctrl->pctl) {
+		dev_err(&pdev->dev, "unable to register cygnus pinctrl\n");
+		return -EINVAL;
+	}
+
+	platform_set_drvdata(pdev, pinctrl);
+
+	return 0;
+}
+
+static int cygnus_pinctrl_remove(struct platform_device *pdev)
+{
+	struct cygnus_pinctrl *pinctrl = platform_get_drvdata(pdev);
+
+	pinctrl_unregister(pinctrl->pctl);
+	platform_set_drvdata(pdev, NULL);
+
+	return 0;
+}
+
+static struct of_device_id cygnus_pinctrl_of_match[] = {
+	{ .compatible = "brcm,cygnus-pinctrl", },
+	{ },
+};
+
+static struct platform_driver cygnus_pinctrl_driver = {
+	.driver = {
+		.name = "cygnus-pinctrl",
+		.owner = THIS_MODULE,
+		.of_match_table = cygnus_pinctrl_of_match,
+	},
+	.probe = cygnus_pinctrl_probe,
+	.remove = cygnus_pinctrl_remove,
+};
+
+static int __init cygnus_pinctrl_init(void)
+{
+	return platform_driver_register(&cygnus_pinctrl_driver);
+}
+arch_initcall(cygnus_pinctrl_init);
+
+static void __exit cygnus_pinctrl_exit(void)
+{
+	platform_driver_unregister(&cygnus_pinctrl_driver);
+}
+module_exit(cygnus_pinctrl_exit);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus pinctrl driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v2 3/4] ARM: mach-bcm: enable pinctrl support for Cygnus

[Ray Jui]

This enables the pinctrl driver for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 arch/arm/mach-bcm/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index aaeec78..b4efff2 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -29,6 +29,7 @@ config ARCH_BCM_IPROC
 config ARCH_BCM_CYGNUS
 	bool "Broadcom Cygnus Support" if ARCH_MULTI_V7
 	select ARCH_BCM_IPROC
+	select PINCTRL_BCM_CYGNUS
 	help
 	  Enable support for the Cygnus family,
 	  which includes the following variants:
-- 
1.7.9.5

[PATCH v2 3/4] ARM: mach-bcm: enable pinctrl support for Cygnus

[Ray Jui]

This enables the pinctrl driver for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 arch/arm/mach-bcm/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index aaeec78..b4efff2 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -29,6 +29,7 @@ config ARCH_BCM_IPROC
 config ARCH_BCM_CYGNUS
 	bool "Broadcom Cygnus Support" if ARCH_MULTI_V7
 	select ARCH_BCM_IPROC
+	select PINCTRL_BCM_CYGNUS
 	help
 	  Enable support for the Cygnus family,
 	  which includes the following variants:
-- 
1.7.9.5

[PATCH v2 3/4] ARM: mach-bcm: enable pinctrl support for Cygnus

[Ray Jui]

This enables the pinctrl driver for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 arch/arm/mach-bcm/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index aaeec78..b4efff2 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -29,6 +29,7 @@ config ARCH_BCM_IPROC
 config ARCH_BCM_CYGNUS
 	bool "Broadcom Cygnus Support" if ARCH_MULTI_V7
 	select ARCH_BCM_IPROC
+	select PINCTRL_BCM_CYGNUS
 	help
 	  Enable support for the Cygnus family,
 	  which includes the following variants:
-- 
1.7.9.5

[PATCH v2 4/4] ARM: dts: enable pinctrl for Broadcom Cygnus

[Ray Jui]

This enables the pinctrl support for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..4c6bf4d 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -54,6 +54,11 @@
 
 	/include/ "bcm-cygnus-clock.dtsi"
 
+	pinctrl: pinctrl@0x0301d0c8 {
+		compatible = "brcm,cygnus-pinctrl";
+		reg = <0x0301d0c8 0x2c>;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

[PATCH v2 4/4] ARM: dts: enable pinctrl for Broadcom Cygnus

[Ray Jui]

This enables the pinctrl support for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..4c6bf4d 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -54,6 +54,11 @@
 
 	/include/ "bcm-cygnus-clock.dtsi"
 
+	pinctrl: pinctrl@0x0301d0c8 {
+		compatible = "brcm,cygnus-pinctrl";
+		reg = <0x0301d0c8 0x2c>;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

[PATCH v2 4/4] ARM: dts: enable pinctrl for Broadcom Cygnus

[Ray Jui]

This enables the pinctrl support for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..4c6bf4d 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -54,6 +54,11 @@
 
 	/include/ "bcm-cygnus-clock.dtsi"
 
+	pinctrl: pinctrl at 0x0301d0c8 {
+		compatible = "brcm,cygnus-pinctrl";
+		reg = <0x0301d0c8 0x2c>;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

[PATCH 0/5] Add gpio support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial GPIO support for the Broadcom Cygnus SoC.
Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
the same Cygnus GPIO driver

Ray Jui (5):
  gpio: Cygnus: define Broadcom Cygnus GPIO binding
  gpio: Cygnus: add GPIO driver
  ARM: mach-bcm: Enable GPIO support for Cygnus
  ARM: dts: enable GPIO for Broadcom Cygnus
  MAINTAINERS: Entry for Cygnus GPIO driver

 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   85 +++
 MAINTAINERS                                        |    7 +
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   30 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/gpio/Kconfig                               |   11 +
 drivers/gpio/Makefile                              |    1 +
 drivers/gpio/gpio-bcm-cygnus.c                     |  719 ++++++++++++++++++++
 7 files changed, 854 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

-- 
1.7.9.5

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[PATCH 0/5] Add gpio support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial GPIO support for the Broadcom Cygnus SoC.
Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
the same Cygnus GPIO driver

Ray Jui (5):
  gpio: Cygnus: define Broadcom Cygnus GPIO binding
  gpio: Cygnus: add GPIO driver
  ARM: mach-bcm: Enable GPIO support for Cygnus
  ARM: dts: enable GPIO for Broadcom Cygnus
  MAINTAINERS: Entry for Cygnus GPIO driver

 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   85 +++
 MAINTAINERS                                        |    7 +
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   30 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/gpio/Kconfig                               |   11 +
 drivers/gpio/Makefile                              |    1 +
 drivers/gpio/gpio-bcm-cygnus.c                     |  719 ++++++++++++++++++++
 7 files changed, 854 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

-- 
1.7.9.5

[PATCH 0/5] Add gpio support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial GPIO support for the Broadcom Cygnus SoC.
Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
the same Cygnus GPIO driver

Ray Jui (5):
  gpio: Cygnus: define Broadcom Cygnus GPIO binding
  gpio: Cygnus: add GPIO driver
  ARM: mach-bcm: Enable GPIO support for Cygnus
  ARM: dts: enable GPIO for Broadcom Cygnus
  MAINTAINERS: Entry for Cygnus GPIO driver

 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   85 +++
 MAINTAINERS                                        |    7 +
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   30 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/gpio/Kconfig                               |   11 +
 drivers/gpio/Makefile                              |    1 +
 drivers/gpio/gpio-bcm-cygnus.c                     |  719 ++++++++++++++++++++
 7 files changed, 854 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

-- 
1.7.9.5

[PATCH 1/5] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

Document the GPIO device tree binding for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   85 ++++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt

diff --git a/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
new file mode 100644
index 0000000..24a1513
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
@@ -0,0 +1,85 @@
+Broadcom Cygnus GPIO Controller
+
+Required properties:
+
+- compatible:
+    Currently supported Cygnus GPIO controllers include:
+    "brcm,cygnus-ccm-gpio": ChipcommonG GPIO controller
+    "brcm,cygnus-asiu-gpio": ASIU GPIO controller
+    "brcm,cygnus-crmu-gpio": CRMU GPIO controller
+
+- reg:
+    Define the base and range of the I/O address space that contain the Cygnus
+GPIO controller registers
+
+- ngpios:
+    Total number of GPIOs the controller provides
+
+- #gpio-cells:
+    Must be two. The first cell is the GPIO pin number (within the
+controller's domain) and the second cell is used for the following:
+    bit[0]: polarity (0 for normal and 1 for inverted)
+    bit[18:16]: internal pull up/down: 0 - pull up/down disabled
+                                       1 - pull up enabled
+                                       2 - pull down enabled
+    bit[22:20]: drive strength: 0 - 2 mA
+                                1 - 4 mA
+                                2 - 6 mA
+                                3 - 8 mA
+                                4 - 10 mA
+                                5 - 12 mA
+                                6 - 14 mA
+                                7 - 16 mA
+
+- gpio-controller:
+    Specifies that the node is a GPIO controller
+
+Optional properties:
+
+- interrupt-controller:
+    Specifies that the node is an interrupt controller. Not all Cygnus GPIO
+interfaces support interrupt, e.g., the CRMU GPIO controller does not have its
+interrupt routed to the main processor's GIC
+
+- interrupts:
+    The interrupt outputs from the GPIO controller.
+
+- no-interrupt:
+    Specifies that the GPIO interface does not support interrupt
+
+Example:
+	gpio_asiu: gpio@180a5000 {
+		compatible = "brcm,cygnus-asiu-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio@03024800 {
+		compatible = "brcm,cygnus-crmu-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-interrupt;
+	};
+
+	/*
+	 * Touchscreen that uses the ASIU GPIO 100, with internal pull-up
+	 * enabled
+	 */
+	tsc {
+		...
+		...
+		gpio-event = <&gpio_asiu 100 0x10000>;
+	};
+
+	/* Bluetooth that uses the CRMU GPIO 2, with polarity inverted */
+	bluetooth {
+		...
+		...
+		bcm,rfkill-bank-sel = <&gpio_crmu 2 1>
+	}
-- 
1.7.9.5

[PATCH 1/5] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

Document the GPIO device tree binding for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   85 ++++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt

diff --git a/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
new file mode 100644
index 0000000..24a1513
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
@@ -0,0 +1,85 @@
+Broadcom Cygnus GPIO Controller
+
+Required properties:
+
+- compatible:
+    Currently supported Cygnus GPIO controllers include:
+    "brcm,cygnus-ccm-gpio": ChipcommonG GPIO controller
+    "brcm,cygnus-asiu-gpio": ASIU GPIO controller
+    "brcm,cygnus-crmu-gpio": CRMU GPIO controller
+
+- reg:
+    Define the base and range of the I/O address space that contain the Cygnus
+GPIO controller registers
+
+- ngpios:
+    Total number of GPIOs the controller provides
+
+- #gpio-cells:
+    Must be two. The first cell is the GPIO pin number (within the
+controller's domain) and the second cell is used for the following:
+    bit[0]: polarity (0 for normal and 1 for inverted)
+    bit[18:16]: internal pull up/down: 0 - pull up/down disabled
+                                       1 - pull up enabled
+                                       2 - pull down enabled
+    bit[22:20]: drive strength: 0 - 2 mA
+                                1 - 4 mA
+                                2 - 6 mA
+                                3 - 8 mA
+                                4 - 10 mA
+                                5 - 12 mA
+                                6 - 14 mA
+                                7 - 16 mA
+
+- gpio-controller:
+    Specifies that the node is a GPIO controller
+
+Optional properties:
+
+- interrupt-controller:
+    Specifies that the node is an interrupt controller. Not all Cygnus GPIO
+interfaces support interrupt, e.g., the CRMU GPIO controller does not have its
+interrupt routed to the main processor's GIC
+
+- interrupts:
+    The interrupt outputs from the GPIO controller.
+
+- no-interrupt:
+    Specifies that the GPIO interface does not support interrupt
+
+Example:
+	gpio_asiu: gpio@180a5000 {
+		compatible = "brcm,cygnus-asiu-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio@03024800 {
+		compatible = "brcm,cygnus-crmu-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-interrupt;
+	};
+
+	/*
+	 * Touchscreen that uses the ASIU GPIO 100, with internal pull-up
+	 * enabled
+	 */
+	tsc {
+		...
+		...
+		gpio-event = <&gpio_asiu 100 0x10000>;
+	};
+
+	/* Bluetooth that uses the CRMU GPIO 2, with polarity inverted */
+	bluetooth {
+		...
+		...
+		bcm,rfkill-bank-sel = <&gpio_crmu 2 1>
+	}
-- 
1.7.9.5

[PATCH 1/5] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

Document the GPIO device tree binding for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   85 ++++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt

diff --git a/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
new file mode 100644
index 0000000..24a1513
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
@@ -0,0 +1,85 @@
+Broadcom Cygnus GPIO Controller
+
+Required properties:
+
+- compatible:
+    Currently supported Cygnus GPIO controllers include:
+    "brcm,cygnus-ccm-gpio": ChipcommonG GPIO controller
+    "brcm,cygnus-asiu-gpio": ASIU GPIO controller
+    "brcm,cygnus-crmu-gpio": CRMU GPIO controller
+
+- reg:
+    Define the base and range of the I/O address space that contain the Cygnus
+GPIO controller registers
+
+- ngpios:
+    Total number of GPIOs the controller provides
+
+- #gpio-cells:
+    Must be two. The first cell is the GPIO pin number (within the
+controller's domain) and the second cell is used for the following:
+    bit[0]: polarity (0 for normal and 1 for inverted)
+    bit[18:16]: internal pull up/down: 0 - pull up/down disabled
+                                       1 - pull up enabled
+                                       2 - pull down enabled
+    bit[22:20]: drive strength: 0 - 2 mA
+                                1 - 4 mA
+                                2 - 6 mA
+                                3 - 8 mA
+                                4 - 10 mA
+                                5 - 12 mA
+                                6 - 14 mA
+                                7 - 16 mA
+
+- gpio-controller:
+    Specifies that the node is a GPIO controller
+
+Optional properties:
+
+- interrupt-controller:
+    Specifies that the node is an interrupt controller. Not all Cygnus GPIO
+interfaces support interrupt, e.g., the CRMU GPIO controller does not have its
+interrupt routed to the main processor's GIC
+
+- interrupts:
+    The interrupt outputs from the GPIO controller.
+
+- no-interrupt:
+    Specifies that the GPIO interface does not support interrupt
+
+Example:
+	gpio_asiu: gpio at 180a5000 {
+		compatible = "brcm,cygnus-asiu-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio at 03024800 {
+		compatible = "brcm,cygnus-crmu-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-interrupt;
+	};
+
+	/*
+	 * Touchscreen that uses the ASIU GPIO 100, with internal pull-up
+	 * enabled
+	 */
+	tsc {
+		...
+		...
+		gpio-event = <&gpio_asiu 100 0x10000>;
+	};
+
+	/* Bluetooth that uses the CRMU GPIO 2, with polarity inverted */
+	bluetooth {
+		...
+		...
+		bcm,rfkill-bank-sel = <&gpio_crmu 2 1>
+	}
-- 
1.7.9.5

[PATCH 2/5] gpio: Cygnus: add GPIO driver

[Ray Jui]

This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller
("brcm,cygnus-asiu-gpio"), 2) the chipCommonG GPIO controller
("brcm,cygnus-ccm-gpio"), and 3) the ALWAYS-ON GPIO controller
("brcm,cygnus-crmu-gpio")

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/gpio/Kconfig           |   11 +
 drivers/gpio/Makefile          |    1 +
 drivers/gpio/gpio-bcm-cygnus.c |  719 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 731 insertions(+)
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 633ec21..3e3b0342 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -126,6 +126,17 @@ config GPIO_74XX_MMIO
 	    8 bits:	74244 (Input), 74273 (Output)
 	    16 bits:	741624 (Input), 7416374 (Output)
 
+config GPIO_BCM_CYGNUS
+	bool "Broadcom Cygnus GPIO support"
+	depends on ARCH_BCM_CYGNUS && OF_GPIO
+	help
+	  Say yes here to turn on GPIO support for Broadcom Cygnus SoC
+
+	  The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
+	  GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
+	  the always-ON GPIO controller (CRMU). All 3 GPIO controllers are
+	  supported by this driver
+
 config GPIO_CLPS711X
 	tristate "CLPS711X GPIO support"
 	depends on ARCH_CLPS711X || COMPILE_TEST
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 81755f1..31eb7e0 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_GPIO_ADP5520)	+= gpio-adp5520.o
 obj-$(CONFIG_GPIO_ADP5588)	+= gpio-adp5588.o
 obj-$(CONFIG_GPIO_AMD8111)	+= gpio-amd8111.o
 obj-$(CONFIG_GPIO_ARIZONA)	+= gpio-arizona.o
+obj-$(CONFIG_GPIO_BCM_CYGNUS)	+= gpio-bcm-cygnus.o
 obj-$(CONFIG_GPIO_BCM_KONA)	+= gpio-bcm-kona.o
 obj-$(CONFIG_GPIO_BT8XX)	+= gpio-bt8xx.o
 obj-$(CONFIG_GPIO_CLPS711X)	+= gpio-clps711x.o
diff --git a/drivers/gpio/gpio-bcm-cygnus.c b/drivers/gpio/gpio-bcm-cygnus.c
new file mode 100644
index 0000000..1549ea8
--- /dev/null
+++ b/drivers/gpio/gpio-bcm-cygnus.c
@@ -0,0 +1,719 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/ioport.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/irqchip/chained_irq.h>
+
+#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
+#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
+#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
+#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
+#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
+#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
+#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
+#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
+#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
+#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
+#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
+#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
+
+/* drive strength control for ASIU GPIO */
+#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
+
+/* drive strength control for CCM GPIO */
+#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00
+
+#define GPIO_BANK_SIZE 0x200
+#define NGPIOS_PER_BANK 32
+#define GPIO_BIT(pin) ((pin) % NGPIOS_PER_BANK)
+#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
+
+#define GPIO_FLAG_BIT_MASK           0xffff
+#define GPIO_PULL_BIT_SHIFT          16
+#define GPIO_PULL_BIT_MASK           0x3
+
+#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
+#define GPIO_DRV_STRENGTH_BITS       3
+#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
+
+/*
+ * For GPIO internal pull up/down registers
+ */
+enum gpio_pull {
+	GPIO_PULL_NONE = 0,
+	GPIO_PULL_UP,
+	GPIO_PULL_DOWN,
+	GPIO_PULL_INVALID,
+};
+
+/*
+ * GPIO drive strength
+ */
+enum gpio_drv_strength {
+	GPIO_DRV_STRENGTH_2MA = 0,
+	GPIO_DRV_STRENGTH_4MA,
+	GPIO_DRV_STRENGTH_6MA,
+	GPIO_DRV_STRENGTH_8MA,
+	GPIO_DRV_STRENGTH_10MA,
+	GPIO_DRV_STRENGTH_12MA,
+	GPIO_DRV_STRENGTH_14MA,
+	GPIO_DRV_STRENGTH_16MA,
+	GPIO_DRV_STRENGTH_INVALID,
+};
+
+struct bcm_cygnus_gpio {
+	struct device *dev;
+	void __iomem *base;
+	void __iomem *io_ctrl;
+	spinlock_t lock;
+	struct gpio_chip gc;
+	unsigned num_banks;
+	int irq;
+	struct irq_domain *irq_domain;
+};
+
+static unsigned int gpio_base_index;
+
+static inline struct bcm_cygnus_gpio *to_bcm_cygnus_gpio(
+		struct gpio_chip *gc)
+{
+	return container_of(gc, struct bcm_cygnus_gpio, gc);
+}
+
+static inline int bcm_cygnus_gpio_to_irq(struct gpio_chip *gc,
+		unsigned offset)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+
+	return irq_find_mapping(cygnus_gpio->irq_domain, offset);
+}
+
+static inline unsigned int __gpio_reg_offset(
+		struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio)
+{
+	return GPIO_BANK(gpio) * GPIO_BANK_SIZE;
+}
+
+static inline unsigned int __gpio_bitpos(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio)
+{
+	return GPIO_BIT(gpio);
+}
+
+static void bcm_cygnus_gpio_irq_handler(unsigned int irq,
+		struct irq_desc *desc)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio;
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	int i, bit;
+
+	chained_irq_enter(chip, desc);
+
+	cygnus_gpio = irq_get_handler_data(irq);
+
+	/* go through the entire GPIO banks and handle all interrupts */
+	for (i = 0; i < cygnus_gpio->num_banks; i++) {
+		unsigned long val = readl(cygnus_gpio->base +
+				(i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_MSTAT_OFFSET);
+		if (val) {
+			for_each_set_bit(bit, &val, 32) {
+				unsigned pin = NGPIOS_PER_BANK * i + bit;
+				int child_irq =	bcm_cygnus_gpio_to_irq(
+						&cygnus_gpio->gc, pin);
+
+				/*
+				 * Clear the interrupt before invoking the
+				 * handler, so we do not leave any window
+				 */
+				writel(1 << bit,
+					cygnus_gpio->base +
+					(i * GPIO_BANK_SIZE) +
+					CYGNUS_GPIO_INT_CLR_OFFSET);
+
+				generic_handle_irq(child_irq);
+			}
+
+		}
+	}
+
+	chained_irq_exit(chip, desc);
+}
+
+static void bcm_cygnus_gpio_irq_ack(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_CLR_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static void bcm_cygnus_gpio_irq_mask(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_MSK_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static void bcm_cygnus_gpio_irq_unmask(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_MSK_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static int bcm_cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int int_type, dual_edge, edge_lvl;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	switch (type & IRQ_TYPE_SENSE_MASK) {
+	case IRQ_TYPE_EDGE_RISING:
+		int_type = 0;
+		dual_edge = 0;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_EDGE_FALLING:
+		int_type = 0;
+		dual_edge = 0;
+		edge_lvl = 0;
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		int_type = 0;
+		dual_edge = 1;
+		edge_lvl = 0;
+		break;
+
+	case IRQ_TYPE_LEVEL_HIGH:
+		int_type = 1;
+		dual_edge = 0;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_LOW:
+		int_type = 1;
+		dual_edge = 0;
+		edge_lvl = 0;
+		break;
+
+	default:
+		dev_err(cygnus_gpio->dev, "invalid GPIO irq type 0x%x\n", type);
+		return -EINVAL;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_IN_TYPE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= int_type << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_DE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= dual_edge << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_EDGE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= edge_lvl << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	return 0;
+}
+
+static struct irq_chip bcm_cygnus_gpio_irq_chip = {
+	.name = "bcm-cygnus-gpio",
+	.irq_ack = bcm_cygnus_gpio_irq_ack,
+	.irq_mask = bcm_cygnus_gpio_irq_mask,
+	.irq_unmask = bcm_cygnus_gpio_irq_unmask,
+	.irq_set_type = bcm_cygnus_gpio_irq_set_type,
+};
+
+static int bcm_cygnus_gpio_direction_input(struct gpio_chip *gc,
+		unsigned gpio)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_OUT_EN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+
+	return 0;
+}
+
+static int bcm_cygnus_gpio_direction_output(struct gpio_chip *gc,
+		unsigned gpio, int value)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_OUT_EN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_OUT_OFFSET;
+
+	val = readl(cygnus_gpio->base + offset);
+	if (value)
+		val |= 1 << shift;
+	else
+		val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+		"gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
+		gpio, offset, shift, val);
+
+	return 0;
+}
+
+static void bcm_cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio,
+		int value)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_OUT_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	if (value)
+		val |= 1 << shift;
+	else
+		val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+		"gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
+		gpio, offset, shift, val);
+}
+
+static int bcm_cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_IN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = readl(cygnus_gpio->base + offset);
+	val = (val >> shift) & 1;
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u val:%u\n",
+			gpio, offset, shift, val);
+
+	return val;
+}
+
+static struct lock_class_key gpio_lock_class;
+
+static int bcm_cygnus_gpio_irq_map(struct irq_domain *d, unsigned int irq,
+				 irq_hw_number_t hwirq)
+{
+	int ret;
+
+	ret = irq_set_chip_data(irq, d->host_data);
+	if (ret < 0)
+		return ret;
+	irq_set_lockdep_class(irq, &gpio_lock_class);
+	irq_set_chip_and_handler(irq, &bcm_cygnus_gpio_irq_chip,
+			handle_simple_irq);
+	set_irq_flags(irq, IRQF_VALID);
+
+	return 0;
+}
+
+static void bcm_cygnus_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
+{
+	irq_set_chip_and_handler(irq, NULL, NULL);
+	irq_set_chip_data(irq, NULL);
+}
+
+static struct irq_domain_ops bcm_cygnus_irq_ops = {
+	.map = bcm_cygnus_gpio_irq_map,
+	.unmap = bcm_cygnus_gpio_irq_unmap,
+	.xlate = irq_domain_xlate_twocell,
+};
+
+#ifdef CONFIG_OF_GPIO
+static void bcm_cygnus_gpio_set_pull(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio, enum gpio_pull pull)
+{
+	unsigned int offset, shift;
+	u32 val, up;
+	unsigned long flags;
+
+	switch (pull) {
+	case GPIO_PULL_NONE:
+		return;
+	case GPIO_PULL_UP:
+		up = 1;
+		break;
+	case GPIO_PULL_DOWN:
+		up = 0;
+		break;
+	case GPIO_PULL_INVALID:
+	default:
+		return;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	/* set pull up/down */
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_PAD_RES_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	if (up)
+		val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	/* enable pad */
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_RES_EN_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static void bcm_cygnus_gpio_set_strength(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio, enum gpio_drv_strength strength)
+{
+	struct device *dev = cygnus_gpio->dev;
+	void __iomem *base;
+	unsigned int i, offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	if (of_device_is_compatible(dev->of_node, "brcm,cygnus-asiu-gpio")) {
+		base = cygnus_gpio->base;
+		offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+			CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET;
+	} else if (of_device_is_compatible(dev->of_node,
+			"brcm,cygnus-ccm-gpio")) {
+		if (!cygnus_gpio->io_ctrl)
+			return;
+
+		base = cygnus_gpio->io_ctrl;
+		offset = CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET;
+	} else
+		return;
+
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
+		val = readl(base + offset);
+		val &= ~(1 << shift);
+		val |= ((strength >> i) & 0x1) << shift;
+		writel(val, base + offset);
+		offset += 4;
+	}
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static int bcm_cygnus_gpio_of_xlate(struct gpio_chip *gc,
+		const struct of_phandle_args *gpiospec, u32 *flags)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	enum gpio_pull pull;
+	enum gpio_drv_strength strength;
+
+	if (gc->of_gpio_n_cells < 2)
+		return -EINVAL;
+
+	if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
+		return -EINVAL;
+
+	if (gpiospec->args[0] >= gc->ngpio)
+		return -EINVAL;
+
+	pull = (gpiospec->args[1] >> GPIO_PULL_BIT_SHIFT) & GPIO_PULL_BIT_MASK;
+	if (WARN_ON(pull >= GPIO_PULL_INVALID))
+		return -EINVAL;
+
+	strength = (gpiospec->args[1] >> GPIO_DRV_STRENGTH_BIT_SHIFT) &
+		GPIO_DRV_STRENGTH_BIT_MASK;
+
+	if (flags)
+		*flags = gpiospec->args[1] & GPIO_FLAG_BIT_MASK;
+
+	bcm_cygnus_gpio_set_pull(cygnus_gpio, gpiospec->args[0], pull);
+	bcm_cygnus_gpio_set_strength(cygnus_gpio, gpiospec->args[0], strength);
+
+	return gpiospec->args[0];
+}
+#endif
+
+static const struct of_device_id bcm_cygnus_gpio_of_match[] = {
+	{ .compatible = "brcm,cygnus-crmu-gpio" },
+	{ .compatible = "brcm,cygnus-asiu-gpio" },
+	{ .compatible = "brcm,cygnus-ccm-gpio" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, bcm_cygnus_gpio_of_match);
+
+static int bcm_cygnus_gpio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	const struct of_device_id *match;
+	struct resource *res;
+	struct bcm_cygnus_gpio *cygnus_gpio;
+	struct gpio_chip *gc;
+	u32 i, ngpios;
+	int ret;
+
+	match = of_match_device(bcm_cygnus_gpio_of_match, dev);
+	if (!match) {
+		dev_err(&pdev->dev, "failed to find GPIO controller\n");
+		return -ENODEV;
+	}
+
+	cygnus_gpio = devm_kzalloc(dev, sizeof(*cygnus_gpio), GFP_KERNEL);
+	if (!cygnus_gpio)
+		return -ENOMEM;
+
+	cygnus_gpio->dev = dev;
+	platform_set_drvdata(pdev, cygnus_gpio);
+
+	if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
+		dev_err(&pdev->dev, "missing ngpios device tree property\n");
+		return -ENODEV;
+	}
+	cygnus_gpio->num_banks = (ngpios + NGPIOS_PER_BANK - 1) /
+		NGPIOS_PER_BANK;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "unable to get I/O resource");
+		return -ENODEV;
+	}
+
+	cygnus_gpio->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(cygnus_gpio->base)) {
+		dev_err(&pdev->dev, "unable to map I/O memory\n");
+		return PTR_ERR(cygnus_gpio->base);
+	}
+
+	/*
+	 * Only certain types of Cygnus GPIO interfaces have I/O control
+	 * registers
+	 */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (res) {
+		cygnus_gpio->io_ctrl = devm_ioremap_resource(dev, res);
+		if (IS_ERR(cygnus_gpio->io_ctrl)) {
+			dev_err(&pdev->dev, "unable to map I/O memory\n");
+			return PTR_ERR(cygnus_gpio->io_ctrl);
+		}
+	}
+
+	spin_lock_init(&cygnus_gpio->lock);
+
+	gc = &cygnus_gpio->gc;
+	gc->base = gpio_base_index;
+	gpio_base_index += ngpios;
+	gc->ngpio = ngpios;
+	gc->label = dev_name(dev);
+	gc->dev = dev;
+#ifdef CONFIG_OF_GPIO
+	gc->of_node = dev->of_node;
+	gc->of_gpio_n_cells = 2;
+	gc->of_xlate = bcm_cygnus_gpio_of_xlate;
+#endif
+	gc->direction_input = bcm_cygnus_gpio_direction_input;
+	gc->direction_output = bcm_cygnus_gpio_direction_output;
+	gc->set = bcm_cygnus_gpio_set;
+	gc->get = bcm_cygnus_gpio_get;
+	gc->to_irq = bcm_cygnus_gpio_to_irq;
+
+	ret = gpiochip_add(gc);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "unable to add GPIO chip\n");
+		goto err_dec_gpio_base;
+	}
+
+	/*
+	 * Some of the GPIO interfaces do not have interrupt wired to the main
+	 * processor
+	 */
+	if (of_find_property(dev->of_node, "no-interrupt", NULL))
+		return 0;
+
+	cygnus_gpio->irq_domain = irq_domain_add_linear(dev->of_node,
+			gc->ngpio, &bcm_cygnus_irq_ops, cygnus_gpio);
+	if (!cygnus_gpio->irq_domain) {
+		dev_err(&pdev->dev, "unable to allocate IRQ domain\n");
+		ret = -ENXIO;
+		goto err_rm_gpiochip;
+	}
+
+	cygnus_gpio->irq = platform_get_irq(pdev, 0);
+	if (cygnus_gpio->irq < 0) {
+		dev_err(&pdev->dev, "unable to get IRQ\n");
+		ret = cygnus_gpio->irq;
+		goto err_rm_irq_domain;
+	}
+
+	for (i = 0; i < gc->ngpio; i++) {
+		int irq = irq_create_mapping(cygnus_gpio->irq_domain, i);
+
+		irq_set_lockdep_class(irq, &gpio_lock_class);
+		irq_set_chip_data(irq, cygnus_gpio);
+		irq_set_chip_and_handler(irq, &bcm_cygnus_gpio_irq_chip,
+				handle_simple_irq);
+		set_irq_flags(irq, IRQF_VALID);
+	}
+
+	irq_set_chained_handler(cygnus_gpio->irq, bcm_cygnus_gpio_irq_handler);
+	irq_set_handler_data(cygnus_gpio->irq, cygnus_gpio);
+
+	return 0;
+
+err_rm_irq_domain:
+	irq_domain_remove(cygnus_gpio->irq_domain);
+
+err_rm_gpiochip:
+	gpiochip_remove(gc);
+
+err_dec_gpio_base:
+	gpio_base_index -= ngpios;
+	return ret;
+}
+
+static struct platform_driver bcm_cygnus_gpio_driver = {
+	.driver = {
+		.name = "bcm-cygnus-gpio",
+		.owner = THIS_MODULE,
+		.of_match_table = bcm_cygnus_gpio_of_match,
+	},
+	.probe = bcm_cygnus_gpio_probe,
+};
+
+module_platform_driver(bcm_cygnus_gpio_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus GPIO Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH 2/5] gpio: Cygnus: add GPIO driver

[Ray Jui]

This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller
("brcm,cygnus-asiu-gpio"), 2) the chipCommonG GPIO controller
("brcm,cygnus-ccm-gpio"), and 3) the ALWAYS-ON GPIO controller
("brcm,cygnus-crmu-gpio")

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/gpio/Kconfig           |   11 +
 drivers/gpio/Makefile          |    1 +
 drivers/gpio/gpio-bcm-cygnus.c |  719 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 731 insertions(+)
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 633ec21..3e3b0342 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -126,6 +126,17 @@ config GPIO_74XX_MMIO
 	    8 bits:	74244 (Input), 74273 (Output)
 	    16 bits:	741624 (Input), 7416374 (Output)
 
+config GPIO_BCM_CYGNUS
+	bool "Broadcom Cygnus GPIO support"
+	depends on ARCH_BCM_CYGNUS && OF_GPIO
+	help
+	  Say yes here to turn on GPIO support for Broadcom Cygnus SoC
+
+	  The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
+	  GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
+	  the always-ON GPIO controller (CRMU). All 3 GPIO controllers are
+	  supported by this driver
+
 config GPIO_CLPS711X
 	tristate "CLPS711X GPIO support"
 	depends on ARCH_CLPS711X || COMPILE_TEST
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 81755f1..31eb7e0 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_GPIO_ADP5520)	+= gpio-adp5520.o
 obj-$(CONFIG_GPIO_ADP5588)	+= gpio-adp5588.o
 obj-$(CONFIG_GPIO_AMD8111)	+= gpio-amd8111.o
 obj-$(CONFIG_GPIO_ARIZONA)	+= gpio-arizona.o
+obj-$(CONFIG_GPIO_BCM_CYGNUS)	+= gpio-bcm-cygnus.o
 obj-$(CONFIG_GPIO_BCM_KONA)	+= gpio-bcm-kona.o
 obj-$(CONFIG_GPIO_BT8XX)	+= gpio-bt8xx.o
 obj-$(CONFIG_GPIO_CLPS711X)	+= gpio-clps711x.o
diff --git a/drivers/gpio/gpio-bcm-cygnus.c b/drivers/gpio/gpio-bcm-cygnus.c
new file mode 100644
index 0000000..1549ea8
--- /dev/null
+++ b/drivers/gpio/gpio-bcm-cygnus.c
@@ -0,0 +1,719 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/ioport.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/irqchip/chained_irq.h>
+
+#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
+#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
+#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
+#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
+#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
+#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
+#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
+#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
+#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
+#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
+#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
+#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
+
+/* drive strength control for ASIU GPIO */
+#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
+
+/* drive strength control for CCM GPIO */
+#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00
+
+#define GPIO_BANK_SIZE 0x200
+#define NGPIOS_PER_BANK 32
+#define GPIO_BIT(pin) ((pin) % NGPIOS_PER_BANK)
+#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
+
+#define GPIO_FLAG_BIT_MASK           0xffff
+#define GPIO_PULL_BIT_SHIFT          16
+#define GPIO_PULL_BIT_MASK           0x3
+
+#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
+#define GPIO_DRV_STRENGTH_BITS       3
+#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
+
+/*
+ * For GPIO internal pull up/down registers
+ */
+enum gpio_pull {
+	GPIO_PULL_NONE = 0,
+	GPIO_PULL_UP,
+	GPIO_PULL_DOWN,
+	GPIO_PULL_INVALID,
+};
+
+/*
+ * GPIO drive strength
+ */
+enum gpio_drv_strength {
+	GPIO_DRV_STRENGTH_2MA = 0,
+	GPIO_DRV_STRENGTH_4MA,
+	GPIO_DRV_STRENGTH_6MA,
+	GPIO_DRV_STRENGTH_8MA,
+	GPIO_DRV_STRENGTH_10MA,
+	GPIO_DRV_STRENGTH_12MA,
+	GPIO_DRV_STRENGTH_14MA,
+	GPIO_DRV_STRENGTH_16MA,
+	GPIO_DRV_STRENGTH_INVALID,
+};
+
+struct bcm_cygnus_gpio {
+	struct device *dev;
+	void __iomem *base;
+	void __iomem *io_ctrl;
+	spinlock_t lock;
+	struct gpio_chip gc;
+	unsigned num_banks;
+	int irq;
+	struct irq_domain *irq_domain;
+};
+
+static unsigned int gpio_base_index;
+
+static inline struct bcm_cygnus_gpio *to_bcm_cygnus_gpio(
+		struct gpio_chip *gc)
+{
+	return container_of(gc, struct bcm_cygnus_gpio, gc);
+}
+
+static inline int bcm_cygnus_gpio_to_irq(struct gpio_chip *gc,
+		unsigned offset)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+
+	return irq_find_mapping(cygnus_gpio->irq_domain, offset);
+}
+
+static inline unsigned int __gpio_reg_offset(
+		struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio)
+{
+	return GPIO_BANK(gpio) * GPIO_BANK_SIZE;
+}
+
+static inline unsigned int __gpio_bitpos(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio)
+{
+	return GPIO_BIT(gpio);
+}
+
+static void bcm_cygnus_gpio_irq_handler(unsigned int irq,
+		struct irq_desc *desc)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio;
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	int i, bit;
+
+	chained_irq_enter(chip, desc);
+
+	cygnus_gpio = irq_get_handler_data(irq);
+
+	/* go through the entire GPIO banks and handle all interrupts */
+	for (i = 0; i < cygnus_gpio->num_banks; i++) {
+		unsigned long val = readl(cygnus_gpio->base +
+				(i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_MSTAT_OFFSET);
+		if (val) {
+			for_each_set_bit(bit, &val, 32) {
+				unsigned pin = NGPIOS_PER_BANK * i + bit;
+				int child_irq =	bcm_cygnus_gpio_to_irq(
+						&cygnus_gpio->gc, pin);
+
+				/*
+				 * Clear the interrupt before invoking the
+				 * handler, so we do not leave any window
+				 */
+				writel(1 << bit,
+					cygnus_gpio->base +
+					(i * GPIO_BANK_SIZE) +
+					CYGNUS_GPIO_INT_CLR_OFFSET);
+
+				generic_handle_irq(child_irq);
+			}
+
+		}
+	}
+
+	chained_irq_exit(chip, desc);
+}
+
+static void bcm_cygnus_gpio_irq_ack(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_CLR_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static void bcm_cygnus_gpio_irq_mask(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_MSK_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static void bcm_cygnus_gpio_irq_unmask(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_MSK_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static int bcm_cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int int_type, dual_edge, edge_lvl;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	switch (type & IRQ_TYPE_SENSE_MASK) {
+	case IRQ_TYPE_EDGE_RISING:
+		int_type = 0;
+		dual_edge = 0;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_EDGE_FALLING:
+		int_type = 0;
+		dual_edge = 0;
+		edge_lvl = 0;
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		int_type = 0;
+		dual_edge = 1;
+		edge_lvl = 0;
+		break;
+
+	case IRQ_TYPE_LEVEL_HIGH:
+		int_type = 1;
+		dual_edge = 0;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_LOW:
+		int_type = 1;
+		dual_edge = 0;
+		edge_lvl = 0;
+		break;
+
+	default:
+		dev_err(cygnus_gpio->dev, "invalid GPIO irq type 0x%x\n", type);
+		return -EINVAL;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_IN_TYPE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= int_type << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_DE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= dual_edge << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_EDGE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= edge_lvl << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	return 0;
+}
+
+static struct irq_chip bcm_cygnus_gpio_irq_chip = {
+	.name = "bcm-cygnus-gpio",
+	.irq_ack = bcm_cygnus_gpio_irq_ack,
+	.irq_mask = bcm_cygnus_gpio_irq_mask,
+	.irq_unmask = bcm_cygnus_gpio_irq_unmask,
+	.irq_set_type = bcm_cygnus_gpio_irq_set_type,
+};
+
+static int bcm_cygnus_gpio_direction_input(struct gpio_chip *gc,
+		unsigned gpio)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_OUT_EN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+
+	return 0;
+}
+
+static int bcm_cygnus_gpio_direction_output(struct gpio_chip *gc,
+		unsigned gpio, int value)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_OUT_EN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_OUT_OFFSET;
+
+	val = readl(cygnus_gpio->base + offset);
+	if (value)
+		val |= 1 << shift;
+	else
+		val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+		"gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
+		gpio, offset, shift, val);
+
+	return 0;
+}
+
+static void bcm_cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio,
+		int value)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_OUT_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	if (value)
+		val |= 1 << shift;
+	else
+		val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+		"gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
+		gpio, offset, shift, val);
+}
+
+static int bcm_cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_IN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = readl(cygnus_gpio->base + offset);
+	val = (val >> shift) & 1;
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u val:%u\n",
+			gpio, offset, shift, val);
+
+	return val;
+}
+
+static struct lock_class_key gpio_lock_class;
+
+static int bcm_cygnus_gpio_irq_map(struct irq_domain *d, unsigned int irq,
+				 irq_hw_number_t hwirq)
+{
+	int ret;
+
+	ret = irq_set_chip_data(irq, d->host_data);
+	if (ret < 0)
+		return ret;
+	irq_set_lockdep_class(irq, &gpio_lock_class);
+	irq_set_chip_and_handler(irq, &bcm_cygnus_gpio_irq_chip,
+			handle_simple_irq);
+	set_irq_flags(irq, IRQF_VALID);
+
+	return 0;
+}
+
+static void bcm_cygnus_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
+{
+	irq_set_chip_and_handler(irq, NULL, NULL);
+	irq_set_chip_data(irq, NULL);
+}
+
+static struct irq_domain_ops bcm_cygnus_irq_ops = {
+	.map = bcm_cygnus_gpio_irq_map,
+	.unmap = bcm_cygnus_gpio_irq_unmap,
+	.xlate = irq_domain_xlate_twocell,
+};
+
+#ifdef CONFIG_OF_GPIO
+static void bcm_cygnus_gpio_set_pull(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio, enum gpio_pull pull)
+{
+	unsigned int offset, shift;
+	u32 val, up;
+	unsigned long flags;
+
+	switch (pull) {
+	case GPIO_PULL_NONE:
+		return;
+	case GPIO_PULL_UP:
+		up = 1;
+		break;
+	case GPIO_PULL_DOWN:
+		up = 0;
+		break;
+	case GPIO_PULL_INVALID:
+	default:
+		return;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	/* set pull up/down */
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_PAD_RES_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	if (up)
+		val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	/* enable pad */
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_RES_EN_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static void bcm_cygnus_gpio_set_strength(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio, enum gpio_drv_strength strength)
+{
+	struct device *dev = cygnus_gpio->dev;
+	void __iomem *base;
+	unsigned int i, offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	if (of_device_is_compatible(dev->of_node, "brcm,cygnus-asiu-gpio")) {
+		base = cygnus_gpio->base;
+		offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+			CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET;
+	} else if (of_device_is_compatible(dev->of_node,
+			"brcm,cygnus-ccm-gpio")) {
+		if (!cygnus_gpio->io_ctrl)
+			return;
+
+		base = cygnus_gpio->io_ctrl;
+		offset = CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET;
+	} else
+		return;
+
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
+		val = readl(base + offset);
+		val &= ~(1 << shift);
+		val |= ((strength >> i) & 0x1) << shift;
+		writel(val, base + offset);
+		offset += 4;
+	}
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static int bcm_cygnus_gpio_of_xlate(struct gpio_chip *gc,
+		const struct of_phandle_args *gpiospec, u32 *flags)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	enum gpio_pull pull;
+	enum gpio_drv_strength strength;
+
+	if (gc->of_gpio_n_cells < 2)
+		return -EINVAL;
+
+	if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
+		return -EINVAL;
+
+	if (gpiospec->args[0] >= gc->ngpio)
+		return -EINVAL;
+
+	pull = (gpiospec->args[1] >> GPIO_PULL_BIT_SHIFT) & GPIO_PULL_BIT_MASK;
+	if (WARN_ON(pull >= GPIO_PULL_INVALID))
+		return -EINVAL;
+
+	strength = (gpiospec->args[1] >> GPIO_DRV_STRENGTH_BIT_SHIFT) &
+		GPIO_DRV_STRENGTH_BIT_MASK;
+
+	if (flags)
+		*flags = gpiospec->args[1] & GPIO_FLAG_BIT_MASK;
+
+	bcm_cygnus_gpio_set_pull(cygnus_gpio, gpiospec->args[0], pull);
+	bcm_cygnus_gpio_set_strength(cygnus_gpio, gpiospec->args[0], strength);
+
+	return gpiospec->args[0];
+}
+#endif
+
+static const struct of_device_id bcm_cygnus_gpio_of_match[] = {
+	{ .compatible = "brcm,cygnus-crmu-gpio" },
+	{ .compatible = "brcm,cygnus-asiu-gpio" },
+	{ .compatible = "brcm,cygnus-ccm-gpio" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, bcm_cygnus_gpio_of_match);
+
+static int bcm_cygnus_gpio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	const struct of_device_id *match;
+	struct resource *res;
+	struct bcm_cygnus_gpio *cygnus_gpio;
+	struct gpio_chip *gc;
+	u32 i, ngpios;
+	int ret;
+
+	match = of_match_device(bcm_cygnus_gpio_of_match, dev);
+	if (!match) {
+		dev_err(&pdev->dev, "failed to find GPIO controller\n");
+		return -ENODEV;
+	}
+
+	cygnus_gpio = devm_kzalloc(dev, sizeof(*cygnus_gpio), GFP_KERNEL);
+	if (!cygnus_gpio)
+		return -ENOMEM;
+
+	cygnus_gpio->dev = dev;
+	platform_set_drvdata(pdev, cygnus_gpio);
+
+	if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
+		dev_err(&pdev->dev, "missing ngpios device tree property\n");
+		return -ENODEV;
+	}
+	cygnus_gpio->num_banks = (ngpios + NGPIOS_PER_BANK - 1) /
+		NGPIOS_PER_BANK;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "unable to get I/O resource");
+		return -ENODEV;
+	}
+
+	cygnus_gpio->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(cygnus_gpio->base)) {
+		dev_err(&pdev->dev, "unable to map I/O memory\n");
+		return PTR_ERR(cygnus_gpio->base);
+	}
+
+	/*
+	 * Only certain types of Cygnus GPIO interfaces have I/O control
+	 * registers
+	 */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (res) {
+		cygnus_gpio->io_ctrl = devm_ioremap_resource(dev, res);
+		if (IS_ERR(cygnus_gpio->io_ctrl)) {
+			dev_err(&pdev->dev, "unable to map I/O memory\n");
+			return PTR_ERR(cygnus_gpio->io_ctrl);
+		}
+	}
+
+	spin_lock_init(&cygnus_gpio->lock);
+
+	gc = &cygnus_gpio->gc;
+	gc->base = gpio_base_index;
+	gpio_base_index += ngpios;
+	gc->ngpio = ngpios;
+	gc->label = dev_name(dev);
+	gc->dev = dev;
+#ifdef CONFIG_OF_GPIO
+	gc->of_node = dev->of_node;
+	gc->of_gpio_n_cells = 2;
+	gc->of_xlate = bcm_cygnus_gpio_of_xlate;
+#endif
+	gc->direction_input = bcm_cygnus_gpio_direction_input;
+	gc->direction_output = bcm_cygnus_gpio_direction_output;
+	gc->set = bcm_cygnus_gpio_set;
+	gc->get = bcm_cygnus_gpio_get;
+	gc->to_irq = bcm_cygnus_gpio_to_irq;
+
+	ret = gpiochip_add(gc);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "unable to add GPIO chip\n");
+		goto err_dec_gpio_base;
+	}
+
+	/*
+	 * Some of the GPIO interfaces do not have interrupt wired to the main
+	 * processor
+	 */
+	if (of_find_property(dev->of_node, "no-interrupt", NULL))
+		return 0;
+
+	cygnus_gpio->irq_domain = irq_domain_add_linear(dev->of_node,
+			gc->ngpio, &bcm_cygnus_irq_ops, cygnus_gpio);
+	if (!cygnus_gpio->irq_domain) {
+		dev_err(&pdev->dev, "unable to allocate IRQ domain\n");
+		ret = -ENXIO;
+		goto err_rm_gpiochip;
+	}
+
+	cygnus_gpio->irq = platform_get_irq(pdev, 0);
+	if (cygnus_gpio->irq < 0) {
+		dev_err(&pdev->dev, "unable to get IRQ\n");
+		ret = cygnus_gpio->irq;
+		goto err_rm_irq_domain;
+	}
+
+	for (i = 0; i < gc->ngpio; i++) {
+		int irq = irq_create_mapping(cygnus_gpio->irq_domain, i);
+
+		irq_set_lockdep_class(irq, &gpio_lock_class);
+		irq_set_chip_data(irq, cygnus_gpio);
+		irq_set_chip_and_handler(irq, &bcm_cygnus_gpio_irq_chip,
+				handle_simple_irq);
+		set_irq_flags(irq, IRQF_VALID);
+	}
+
+	irq_set_chained_handler(cygnus_gpio->irq, bcm_cygnus_gpio_irq_handler);
+	irq_set_handler_data(cygnus_gpio->irq, cygnus_gpio);
+
+	return 0;
+
+err_rm_irq_domain:
+	irq_domain_remove(cygnus_gpio->irq_domain);
+
+err_rm_gpiochip:
+	gpiochip_remove(gc);
+
+err_dec_gpio_base:
+	gpio_base_index -= ngpios;
+	return ret;
+}
+
+static struct platform_driver bcm_cygnus_gpio_driver = {
+	.driver = {
+		.name = "bcm-cygnus-gpio",
+		.owner = THIS_MODULE,
+		.of_match_table = bcm_cygnus_gpio_of_match,
+	},
+	.probe = bcm_cygnus_gpio_probe,
+};
+
+module_platform_driver(bcm_cygnus_gpio_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus GPIO Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH 2/5] gpio: Cygnus: add GPIO driver

[Ray Jui]

This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller
("brcm,cygnus-asiu-gpio"), 2) the chipCommonG GPIO controller
("brcm,cygnus-ccm-gpio"), and 3) the ALWAYS-ON GPIO controller
("brcm,cygnus-crmu-gpio")

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/gpio/Kconfig           |   11 +
 drivers/gpio/Makefile          |    1 +
 drivers/gpio/gpio-bcm-cygnus.c |  719 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 731 insertions(+)
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 633ec21..3e3b0342 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -126,6 +126,17 @@ config GPIO_74XX_MMIO
 	    8 bits:	74244 (Input), 74273 (Output)
 	    16 bits:	741624 (Input), 7416374 (Output)
 
+config GPIO_BCM_CYGNUS
+	bool "Broadcom Cygnus GPIO support"
+	depends on ARCH_BCM_CYGNUS && OF_GPIO
+	help
+	  Say yes here to turn on GPIO support for Broadcom Cygnus SoC
+
+	  The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
+	  GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
+	  the always-ON GPIO controller (CRMU). All 3 GPIO controllers are
+	  supported by this driver
+
 config GPIO_CLPS711X
 	tristate "CLPS711X GPIO support"
 	depends on ARCH_CLPS711X || COMPILE_TEST
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 81755f1..31eb7e0 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_GPIO_ADP5520)	+= gpio-adp5520.o
 obj-$(CONFIG_GPIO_ADP5588)	+= gpio-adp5588.o
 obj-$(CONFIG_GPIO_AMD8111)	+= gpio-amd8111.o
 obj-$(CONFIG_GPIO_ARIZONA)	+= gpio-arizona.o
+obj-$(CONFIG_GPIO_BCM_CYGNUS)	+= gpio-bcm-cygnus.o
 obj-$(CONFIG_GPIO_BCM_KONA)	+= gpio-bcm-kona.o
 obj-$(CONFIG_GPIO_BT8XX)	+= gpio-bt8xx.o
 obj-$(CONFIG_GPIO_CLPS711X)	+= gpio-clps711x.o
diff --git a/drivers/gpio/gpio-bcm-cygnus.c b/drivers/gpio/gpio-bcm-cygnus.c
new file mode 100644
index 0000000..1549ea8
--- /dev/null
+++ b/drivers/gpio/gpio-bcm-cygnus.c
@@ -0,0 +1,719 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/ioport.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/irqchip/chained_irq.h>
+
+#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
+#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
+#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
+#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
+#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
+#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
+#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
+#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
+#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
+#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
+#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
+#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
+
+/* drive strength control for ASIU GPIO */
+#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
+
+/* drive strength control for CCM GPIO */
+#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00
+
+#define GPIO_BANK_SIZE 0x200
+#define NGPIOS_PER_BANK 32
+#define GPIO_BIT(pin) ((pin) % NGPIOS_PER_BANK)
+#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
+
+#define GPIO_FLAG_BIT_MASK           0xffff
+#define GPIO_PULL_BIT_SHIFT          16
+#define GPIO_PULL_BIT_MASK           0x3
+
+#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
+#define GPIO_DRV_STRENGTH_BITS       3
+#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
+
+/*
+ * For GPIO internal pull up/down registers
+ */
+enum gpio_pull {
+	GPIO_PULL_NONE = 0,
+	GPIO_PULL_UP,
+	GPIO_PULL_DOWN,
+	GPIO_PULL_INVALID,
+};
+
+/*
+ * GPIO drive strength
+ */
+enum gpio_drv_strength {
+	GPIO_DRV_STRENGTH_2MA = 0,
+	GPIO_DRV_STRENGTH_4MA,
+	GPIO_DRV_STRENGTH_6MA,
+	GPIO_DRV_STRENGTH_8MA,
+	GPIO_DRV_STRENGTH_10MA,
+	GPIO_DRV_STRENGTH_12MA,
+	GPIO_DRV_STRENGTH_14MA,
+	GPIO_DRV_STRENGTH_16MA,
+	GPIO_DRV_STRENGTH_INVALID,
+};
+
+struct bcm_cygnus_gpio {
+	struct device *dev;
+	void __iomem *base;
+	void __iomem *io_ctrl;
+	spinlock_t lock;
+	struct gpio_chip gc;
+	unsigned num_banks;
+	int irq;
+	struct irq_domain *irq_domain;
+};
+
+static unsigned int gpio_base_index;
+
+static inline struct bcm_cygnus_gpio *to_bcm_cygnus_gpio(
+		struct gpio_chip *gc)
+{
+	return container_of(gc, struct bcm_cygnus_gpio, gc);
+}
+
+static inline int bcm_cygnus_gpio_to_irq(struct gpio_chip *gc,
+		unsigned offset)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+
+	return irq_find_mapping(cygnus_gpio->irq_domain, offset);
+}
+
+static inline unsigned int __gpio_reg_offset(
+		struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio)
+{
+	return GPIO_BANK(gpio) * GPIO_BANK_SIZE;
+}
+
+static inline unsigned int __gpio_bitpos(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio)
+{
+	return GPIO_BIT(gpio);
+}
+
+static void bcm_cygnus_gpio_irq_handler(unsigned int irq,
+		struct irq_desc *desc)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio;
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	int i, bit;
+
+	chained_irq_enter(chip, desc);
+
+	cygnus_gpio = irq_get_handler_data(irq);
+
+	/* go through the entire GPIO banks and handle all interrupts */
+	for (i = 0; i < cygnus_gpio->num_banks; i++) {
+		unsigned long val = readl(cygnus_gpio->base +
+				(i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_MSTAT_OFFSET);
+		if (val) {
+			for_each_set_bit(bit, &val, 32) {
+				unsigned pin = NGPIOS_PER_BANK * i + bit;
+				int child_irq =	bcm_cygnus_gpio_to_irq(
+						&cygnus_gpio->gc, pin);
+
+				/*
+				 * Clear the interrupt before invoking the
+				 * handler, so we do not leave any window
+				 */
+				writel(1 << bit,
+					cygnus_gpio->base +
+					(i * GPIO_BANK_SIZE) +
+					CYGNUS_GPIO_INT_CLR_OFFSET);
+
+				generic_handle_irq(child_irq);
+			}
+
+		}
+	}
+
+	chained_irq_exit(chip, desc);
+}
+
+static void bcm_cygnus_gpio_irq_ack(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_CLR_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static void bcm_cygnus_gpio_irq_mask(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_MSK_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static void bcm_cygnus_gpio_irq_unmask(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_MSK_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static int bcm_cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int int_type, dual_edge, edge_lvl;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	switch (type & IRQ_TYPE_SENSE_MASK) {
+	case IRQ_TYPE_EDGE_RISING:
+		int_type = 0;
+		dual_edge = 0;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_EDGE_FALLING:
+		int_type = 0;
+		dual_edge = 0;
+		edge_lvl = 0;
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		int_type = 0;
+		dual_edge = 1;
+		edge_lvl = 0;
+		break;
+
+	case IRQ_TYPE_LEVEL_HIGH:
+		int_type = 1;
+		dual_edge = 0;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_LOW:
+		int_type = 1;
+		dual_edge = 0;
+		edge_lvl = 0;
+		break;
+
+	default:
+		dev_err(cygnus_gpio->dev, "invalid GPIO irq type 0x%x\n", type);
+		return -EINVAL;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_IN_TYPE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= int_type << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_DE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= dual_edge << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_EDGE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= edge_lvl << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	return 0;
+}
+
+static struct irq_chip bcm_cygnus_gpio_irq_chip = {
+	.name = "bcm-cygnus-gpio",
+	.irq_ack = bcm_cygnus_gpio_irq_ack,
+	.irq_mask = bcm_cygnus_gpio_irq_mask,
+	.irq_unmask = bcm_cygnus_gpio_irq_unmask,
+	.irq_set_type = bcm_cygnus_gpio_irq_set_type,
+};
+
+static int bcm_cygnus_gpio_direction_input(struct gpio_chip *gc,
+		unsigned gpio)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_OUT_EN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+
+	return 0;
+}
+
+static int bcm_cygnus_gpio_direction_output(struct gpio_chip *gc,
+		unsigned gpio, int value)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_OUT_EN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_OUT_OFFSET;
+
+	val = readl(cygnus_gpio->base + offset);
+	if (value)
+		val |= 1 << shift;
+	else
+		val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+		"gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
+		gpio, offset, shift, val);
+
+	return 0;
+}
+
+static void bcm_cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio,
+		int value)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_OUT_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	if (value)
+		val |= 1 << shift;
+	else
+		val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+		"gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
+		gpio, offset, shift, val);
+}
+
+static int bcm_cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_IN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = readl(cygnus_gpio->base + offset);
+	val = (val >> shift) & 1;
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u val:%u\n",
+			gpio, offset, shift, val);
+
+	return val;
+}
+
+static struct lock_class_key gpio_lock_class;
+
+static int bcm_cygnus_gpio_irq_map(struct irq_domain *d, unsigned int irq,
+				 irq_hw_number_t hwirq)
+{
+	int ret;
+
+	ret = irq_set_chip_data(irq, d->host_data);
+	if (ret < 0)
+		return ret;
+	irq_set_lockdep_class(irq, &gpio_lock_class);
+	irq_set_chip_and_handler(irq, &bcm_cygnus_gpio_irq_chip,
+			handle_simple_irq);
+	set_irq_flags(irq, IRQF_VALID);
+
+	return 0;
+}
+
+static void bcm_cygnus_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
+{
+	irq_set_chip_and_handler(irq, NULL, NULL);
+	irq_set_chip_data(irq, NULL);
+}
+
+static struct irq_domain_ops bcm_cygnus_irq_ops = {
+	.map = bcm_cygnus_gpio_irq_map,
+	.unmap = bcm_cygnus_gpio_irq_unmap,
+	.xlate = irq_domain_xlate_twocell,
+};
+
+#ifdef CONFIG_OF_GPIO
+static void bcm_cygnus_gpio_set_pull(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio, enum gpio_pull pull)
+{
+	unsigned int offset, shift;
+	u32 val, up;
+	unsigned long flags;
+
+	switch (pull) {
+	case GPIO_PULL_NONE:
+		return;
+	case GPIO_PULL_UP:
+		up = 1;
+		break;
+	case GPIO_PULL_DOWN:
+		up = 0;
+		break;
+	case GPIO_PULL_INVALID:
+	default:
+		return;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	/* set pull up/down */
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_PAD_RES_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	if (up)
+		val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	/* enable pad */
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_RES_EN_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static void bcm_cygnus_gpio_set_strength(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio, enum gpio_drv_strength strength)
+{
+	struct device *dev = cygnus_gpio->dev;
+	void __iomem *base;
+	unsigned int i, offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	if (of_device_is_compatible(dev->of_node, "brcm,cygnus-asiu-gpio")) {
+		base = cygnus_gpio->base;
+		offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+			CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET;
+	} else if (of_device_is_compatible(dev->of_node,
+			"brcm,cygnus-ccm-gpio")) {
+		if (!cygnus_gpio->io_ctrl)
+			return;
+
+		base = cygnus_gpio->io_ctrl;
+		offset = CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET;
+	} else
+		return;
+
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
+		val = readl(base + offset);
+		val &= ~(1 << shift);
+		val |= ((strength >> i) & 0x1) << shift;
+		writel(val, base + offset);
+		offset += 4;
+	}
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static int bcm_cygnus_gpio_of_xlate(struct gpio_chip *gc,
+		const struct of_phandle_args *gpiospec, u32 *flags)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	enum gpio_pull pull;
+	enum gpio_drv_strength strength;
+
+	if (gc->of_gpio_n_cells < 2)
+		return -EINVAL;
+
+	if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
+		return -EINVAL;
+
+	if (gpiospec->args[0] >= gc->ngpio)
+		return -EINVAL;
+
+	pull = (gpiospec->args[1] >> GPIO_PULL_BIT_SHIFT) & GPIO_PULL_BIT_MASK;
+	if (WARN_ON(pull >= GPIO_PULL_INVALID))
+		return -EINVAL;
+
+	strength = (gpiospec->args[1] >> GPIO_DRV_STRENGTH_BIT_SHIFT) &
+		GPIO_DRV_STRENGTH_BIT_MASK;
+
+	if (flags)
+		*flags = gpiospec->args[1] & GPIO_FLAG_BIT_MASK;
+
+	bcm_cygnus_gpio_set_pull(cygnus_gpio, gpiospec->args[0], pull);
+	bcm_cygnus_gpio_set_strength(cygnus_gpio, gpiospec->args[0], strength);
+
+	return gpiospec->args[0];
+}
+#endif
+
+static const struct of_device_id bcm_cygnus_gpio_of_match[] = {
+	{ .compatible = "brcm,cygnus-crmu-gpio" },
+	{ .compatible = "brcm,cygnus-asiu-gpio" },
+	{ .compatible = "brcm,cygnus-ccm-gpio" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, bcm_cygnus_gpio_of_match);
+
+static int bcm_cygnus_gpio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	const struct of_device_id *match;
+	struct resource *res;
+	struct bcm_cygnus_gpio *cygnus_gpio;
+	struct gpio_chip *gc;
+	u32 i, ngpios;
+	int ret;
+
+	match = of_match_device(bcm_cygnus_gpio_of_match, dev);
+	if (!match) {
+		dev_err(&pdev->dev, "failed to find GPIO controller\n");
+		return -ENODEV;
+	}
+
+	cygnus_gpio = devm_kzalloc(dev, sizeof(*cygnus_gpio), GFP_KERNEL);
+	if (!cygnus_gpio)
+		return -ENOMEM;
+
+	cygnus_gpio->dev = dev;
+	platform_set_drvdata(pdev, cygnus_gpio);
+
+	if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
+		dev_err(&pdev->dev, "missing ngpios device tree property\n");
+		return -ENODEV;
+	}
+	cygnus_gpio->num_banks = (ngpios + NGPIOS_PER_BANK - 1) /
+		NGPIOS_PER_BANK;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "unable to get I/O resource");
+		return -ENODEV;
+	}
+
+	cygnus_gpio->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(cygnus_gpio->base)) {
+		dev_err(&pdev->dev, "unable to map I/O memory\n");
+		return PTR_ERR(cygnus_gpio->base);
+	}
+
+	/*
+	 * Only certain types of Cygnus GPIO interfaces have I/O control
+	 * registers
+	 */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (res) {
+		cygnus_gpio->io_ctrl = devm_ioremap_resource(dev, res);
+		if (IS_ERR(cygnus_gpio->io_ctrl)) {
+			dev_err(&pdev->dev, "unable to map I/O memory\n");
+			return PTR_ERR(cygnus_gpio->io_ctrl);
+		}
+	}
+
+	spin_lock_init(&cygnus_gpio->lock);
+
+	gc = &cygnus_gpio->gc;
+	gc->base = gpio_base_index;
+	gpio_base_index += ngpios;
+	gc->ngpio = ngpios;
+	gc->label = dev_name(dev);
+	gc->dev = dev;
+#ifdef CONFIG_OF_GPIO
+	gc->of_node = dev->of_node;
+	gc->of_gpio_n_cells = 2;
+	gc->of_xlate = bcm_cygnus_gpio_of_xlate;
+#endif
+	gc->direction_input = bcm_cygnus_gpio_direction_input;
+	gc->direction_output = bcm_cygnus_gpio_direction_output;
+	gc->set = bcm_cygnus_gpio_set;
+	gc->get = bcm_cygnus_gpio_get;
+	gc->to_irq = bcm_cygnus_gpio_to_irq;
+
+	ret = gpiochip_add(gc);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "unable to add GPIO chip\n");
+		goto err_dec_gpio_base;
+	}
+
+	/*
+	 * Some of the GPIO interfaces do not have interrupt wired to the main
+	 * processor
+	 */
+	if (of_find_property(dev->of_node, "no-interrupt", NULL))
+		return 0;
+
+	cygnus_gpio->irq_domain = irq_domain_add_linear(dev->of_node,
+			gc->ngpio, &bcm_cygnus_irq_ops, cygnus_gpio);
+	if (!cygnus_gpio->irq_domain) {
+		dev_err(&pdev->dev, "unable to allocate IRQ domain\n");
+		ret = -ENXIO;
+		goto err_rm_gpiochip;
+	}
+
+	cygnus_gpio->irq = platform_get_irq(pdev, 0);
+	if (cygnus_gpio->irq < 0) {
+		dev_err(&pdev->dev, "unable to get IRQ\n");
+		ret = cygnus_gpio->irq;
+		goto err_rm_irq_domain;
+	}
+
+	for (i = 0; i < gc->ngpio; i++) {
+		int irq = irq_create_mapping(cygnus_gpio->irq_domain, i);
+
+		irq_set_lockdep_class(irq, &gpio_lock_class);
+		irq_set_chip_data(irq, cygnus_gpio);
+		irq_set_chip_and_handler(irq, &bcm_cygnus_gpio_irq_chip,
+				handle_simple_irq);
+		set_irq_flags(irq, IRQF_VALID);
+	}
+
+	irq_set_chained_handler(cygnus_gpio->irq, bcm_cygnus_gpio_irq_handler);
+	irq_set_handler_data(cygnus_gpio->irq, cygnus_gpio);
+
+	return 0;
+
+err_rm_irq_domain:
+	irq_domain_remove(cygnus_gpio->irq_domain);
+
+err_rm_gpiochip:
+	gpiochip_remove(gc);
+
+err_dec_gpio_base:
+	gpio_base_index -= ngpios;
+	return ret;
+}
+
+static struct platform_driver bcm_cygnus_gpio_driver = {
+	.driver = {
+		.name = "bcm-cygnus-gpio",
+		.owner = THIS_MODULE,
+		.of_match_table = bcm_cygnus_gpio_of_match,
+	},
+	.probe = bcm_cygnus_gpio_probe,
+};
+
+module_platform_driver(bcm_cygnus_gpio_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus GPIO Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH 3/5] ARM: mach-bcm: Enable GPIO support for Cygnus

[Ray Jui]

Enable GPIO driver for Broadcom Cygnus SoC by selecting GPIO_BCM_CYGNUS

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/mach-bcm/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index aaeec78..5066d5d 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -29,6 +29,7 @@ config ARCH_BCM_IPROC
 config ARCH_BCM_CYGNUS
 	bool "Broadcom Cygnus Support" if ARCH_MULTI_V7
 	select ARCH_BCM_IPROC
+	select GPIO_BCM_CYGNUS
 	help
 	  Enable support for the Cygnus family,
 	  which includes the following variants:
-- 
1.7.9.5

[PATCH 3/5] ARM: mach-bcm: Enable GPIO support for Cygnus

[Ray Jui]

Enable GPIO driver for Broadcom Cygnus SoC by selecting GPIO_BCM_CYGNUS

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/mach-bcm/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index aaeec78..5066d5d 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -29,6 +29,7 @@ config ARCH_BCM_IPROC
 config ARCH_BCM_CYGNUS
 	bool "Broadcom Cygnus Support" if ARCH_MULTI_V7
 	select ARCH_BCM_IPROC
+	select GPIO_BCM_CYGNUS
 	help
 	  Enable support for the Cygnus family,
 	  which includes the following variants:
-- 
1.7.9.5

[PATCH 3/5] ARM: mach-bcm: Enable GPIO support for Cygnus

[Ray Jui]

Enable GPIO driver for Broadcom Cygnus SoC by selecting GPIO_BCM_CYGNUS

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/mach-bcm/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index aaeec78..5066d5d 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -29,6 +29,7 @@ config ARCH_BCM_IPROC
 config ARCH_BCM_CYGNUS
 	bool "Broadcom Cygnus Support" if ARCH_MULTI_V7
 	select ARCH_BCM_IPROC
+	select GPIO_BCM_CYGNUS
 	help
 	  Enable support for the Cygnus family,
 	  which includes the following variants:
-- 
1.7.9.5

[PATCH 4/5] ARM: dts: enable GPIO for Broadcom Cygnus

[Ray Jui]

This enables all 3 GPIO controllers including the ASIU GPIO, the
chipcommonG GPIO, and the ALWAYS-ON GPIO, for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..c7587c1 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -54,6 +54,36 @@
 
 	/include/ "bcm-cygnus-clock.dtsi"
 
+	gpio_ccm: gpio@1800a000 {
+		compatible = "brcm,cygnus-ccm-gpio";
+		reg = <0x1800a000 0x50>,
+			<0x0301d164 0x20>;
+		ngpios = <24>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+	};
+
+	gpio_asiu: gpio@180a5000 {
+		compatible = "brcm,cygnus-asiu-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio@03024800 {
+		compatible = "brcm,cygnus-crmu-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-interrupt;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

[PATCH 4/5] ARM: dts: enable GPIO for Broadcom Cygnus

[Ray Jui]

This enables all 3 GPIO controllers including the ASIU GPIO, the
chipcommonG GPIO, and the ALWAYS-ON GPIO, for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..c7587c1 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -54,6 +54,36 @@
 
 	/include/ "bcm-cygnus-clock.dtsi"
 
+	gpio_ccm: gpio@1800a000 {
+		compatible = "brcm,cygnus-ccm-gpio";
+		reg = <0x1800a000 0x50>,
+			<0x0301d164 0x20>;
+		ngpios = <24>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+	};
+
+	gpio_asiu: gpio@180a5000 {
+		compatible = "brcm,cygnus-asiu-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio@03024800 {
+		compatible = "brcm,cygnus-crmu-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-interrupt;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

[PATCH 4/5] ARM: dts: enable GPIO for Broadcom Cygnus

[Ray Jui]

This enables all 3 GPIO controllers including the ASIU GPIO, the
chipcommonG GPIO, and the ALWAYS-ON GPIO, for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..c7587c1 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -54,6 +54,36 @@
 
 	/include/ "bcm-cygnus-clock.dtsi"
 
+	gpio_ccm: gpio at 1800a000 {
+		compatible = "brcm,cygnus-ccm-gpio";
+		reg = <0x1800a000 0x50>,
+			<0x0301d164 0x20>;
+		ngpios = <24>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+	};
+
+	gpio_asiu: gpio at 180a5000 {
+		compatible = "brcm,cygnus-asiu-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio at 03024800 {
+		compatible = "brcm,cygnus-crmu-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-interrupt;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

[PATCH 5/5] MAINTAINERS: Entry for Cygnus GPIO driver

[Ray Jui]

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 MAINTAINERS |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 7b712d8..5d67204 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2174,6 +2174,13 @@ N:	bcm9583*
 N:	bcm583*
 N:	bcm113*
 
+BROADCOM CYGNUS GPIO DRIVER
+M:	Ray Jui <rjui@broadcom.com>
+L:	bcm-kernel-feedback-list@broadcom.com
+S:	Supported
+F:	drivers/gpio/gpio-bcm-cygnus.c
+F:	Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
+
 BROADCOM KONA GPIO DRIVER
 M:	Ray Jui <rjui@broadcom.com>
 L:	bcm-kernel-feedback-list@broadcom.com
-- 
1.7.9.5

[PATCH 5/5] MAINTAINERS: Entry for Cygnus GPIO driver

[Ray Jui]

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 MAINTAINERS |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 7b712d8..5d67204 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2174,6 +2174,13 @@ N:	bcm9583*
 N:	bcm583*
 N:	bcm113*
 
+BROADCOM CYGNUS GPIO DRIVER
+M:	Ray Jui <rjui@broadcom.com>
+L:	bcm-kernel-feedback-list@broadcom.com
+S:	Supported
+F:	drivers/gpio/gpio-bcm-cygnus.c
+F:	Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
+
 BROADCOM KONA GPIO DRIVER
 M:	Ray Jui <rjui@broadcom.com>
 L:	bcm-kernel-feedback-list@broadcom.com
-- 
1.7.9.5

[PATCH 5/5] MAINTAINERS: Entry for Cygnus GPIO driver

[Ray Jui]

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 MAINTAINERS |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 7b712d8..5d67204 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2174,6 +2174,13 @@ N:	bcm9583*
 N:	bcm583*
 N:	bcm113*
 
+BROADCOM CYGNUS GPIO DRIVER
+M:	Ray Jui <rjui@broadcom.com>
+L:	bcm-kernel-feedback-list at broadcom.com
+S:	Supported
+F:	drivers/gpio/gpio-bcm-cygnus.c
+F:	Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
+
 BROADCOM KONA GPIO DRIVER
 M:	Ray Jui <rjui@broadcom.com>
 L:	bcm-kernel-feedback-list at broadcom.com
-- 
1.7.9.5

Re: [PATCH 2/5] gpio: Cygnus: add GPIO driver

[Joe Perches]

On Fri, 2014-12-05 at 16:40 -0800, Ray Jui wrote:
> This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
> SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller
> ("brcm,cygnus-asiu-gpio"), 2) the chipCommonG GPIO controller
> ("brcm,cygnus-ccm-gpio"), and 3) the ALWAYS-ON GPIO controller
> ("brcm,cygnus-crmu-gpio")

trivia:

> diff --git a/drivers/gpio/gpio-bcm-cygnus.c b/drivers/gpio/gpio-bcm-cygnus.c

> +static inline struct bcm_cygnus_gpio *to_bcm_cygnus_gpio(
> +		struct gpio_chip *gc)
> +{
> +	return container_of(gc, struct bcm_cygnus_gpio, gc);
> +}

Probably all of these inlines can just be static.

The compiler does a pretty good job these days
of inlining where appropriate.


> +static void bcm_cygnus_gpio_irq_handler(unsigned int irq,
> +		struct irq_desc *desc)
> +{
> +	struct bcm_cygnus_gpio *cygnus_gpio;
> +	struct irq_chip *chip = irq_desc_get_chip(desc);
> +	int i, bit;
> +
> +	chained_irq_enter(chip, desc);
> +
> +	cygnus_gpio = irq_get_handler_data(irq);
> +
> +	/* go through the entire GPIO banks and handle all interrupts */
> +	for (i = 0; i < cygnus_gpio->num_banks; i++) {
> +		unsigned long val = readl(cygnus_gpio->base +
> +				(i * GPIO_BANK_SIZE) +
> +				CYGNUS_GPIO_INT_MSTAT_OFFSET);
> +		if (val) {

This if (val) and indentation isn't really necessary

> +			for_each_set_bit(bit, &val, 32) {

for_each_set_bit will effectively do the if above.

32 bit only code?
otherwise isn't this endian unsafe?

> +				unsigned pin = NGPIOS_PER_BANK * i + bit;
> +				int child_irq =	bcm_cygnus_gpio_to_irq(
> +						&cygnus_gpio->gc, pin);
> +
> +				/*
> +				 * Clear the interrupt before invoking the
> +				 * handler, so we do not leave any window
> +				 */
> +				writel(1 << bit,
> +					cygnus_gpio->base +
> +					(i * GPIO_BANK_SIZE) +
> +					CYGNUS_GPIO_INT_CLR_OFFSET);
> +
> +				generic_handle_irq(child_irq);
> +			}
> +
> +		}
> +	}
> +
> +	chained_irq_exit(chip, desc);
> +}
> +
> +static void bcm_cygnus_gpio_irq_ack(struct irq_data *d)
> +{
> +	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
> +	unsigned gpio = d->hwirq;
> +	unsigned int offset, shift;
> +	u32 val;
> +
> +	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +		CYGNUS_GPIO_INT_CLR_OFFSET;
> +	shift = __gpio_bitpos(cygnus_gpio, gpio);
> +
> +	val = 1 << shift;
> +	writel(val, cygnus_gpio->base + offset);
> +
> +	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
> +			offset, shift);
> +}

> +static struct irq_chip bcm_cygnus_gpio_irq_chip = {
> +	.name = "bcm-cygnus-gpio",
> +	.irq_ack = bcm_cygnus_gpio_irq_ack,
> +	.irq_mask = bcm_cygnus_gpio_irq_mask,
> +	.irq_unmask = bcm_cygnus_gpio_irq_unmask,
> +	.irq_set_type = bcm_cygnus_gpio_irq_set_type,
> +};

const?

> +static struct irq_domain_ops bcm_cygnus_irq_ops = {
> +	.map = bcm_cygnus_gpio_irq_map,
> +	.unmap = bcm_cygnus_gpio_irq_unmap,
> +	.xlate = irq_domain_xlate_twocell,
> +};

const here too?

> +#ifdef CONFIG_OF_GPIO
> +static void bcm_cygnus_gpio_set_pull(struct bcm_cygnus_gpio *cygnus_gpio,
> +		unsigned gpio, enum gpio_pull pull)
> +{
> +	unsigned int offset, shift;
> +	u32 val, up;

	bool up; ?

> +	unsigned long flags;
> +
> +	switch (pull) {
> +	case GPIO_PULL_NONE:
> +		return;
> +	case GPIO_PULL_UP:
> +		up = 1;
> +		break;
> +	case GPIO_PULL_DOWN:
> +		up = 0;
> +		break;
> +	case GPIO_PULL_INVALID:
> +	default:
> +		return;
> +	}

Maybe more sensible to group GPIO_PULL_NONE with GPIO_PULL_INVALID


> +static int bcm_cygnus_gpio_probe(struct platform_device *pdev)
> +{
[]
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	if (!res) {
> +		dev_err(&pdev->dev, "unable to get I/O resource");

missing newline


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Re: [PATCH 2/5] gpio: Cygnus: add GPIO driver

[Joe Perches]

On Fri, 2014-12-05 at 16:40 -0800, Ray Jui wrote:
> This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
> SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller
> ("brcm,cygnus-asiu-gpio"), 2) the chipCommonG GPIO controller
> ("brcm,cygnus-ccm-gpio"), and 3) the ALWAYS-ON GPIO controller
> ("brcm,cygnus-crmu-gpio")

trivia:

> diff --git a/drivers/gpio/gpio-bcm-cygnus.c b/drivers/gpio/gpio-bcm-cygnus.c

> +static inline struct bcm_cygnus_gpio *to_bcm_cygnus_gpio(
> +		struct gpio_chip *gc)
> +{
> +	return container_of(gc, struct bcm_cygnus_gpio, gc);
> +}

Probably all of these inlines can just be static.

The compiler does a pretty good job these days
of inlining where appropriate.


> +static void bcm_cygnus_gpio_irq_handler(unsigned int irq,
> +		struct irq_desc *desc)
> +{
> +	struct bcm_cygnus_gpio *cygnus_gpio;
> +	struct irq_chip *chip = irq_desc_get_chip(desc);
> +	int i, bit;
> +
> +	chained_irq_enter(chip, desc);
> +
> +	cygnus_gpio = irq_get_handler_data(irq);
> +
> +	/* go through the entire GPIO banks and handle all interrupts */
> +	for (i = 0; i < cygnus_gpio->num_banks; i++) {
> +		unsigned long val = readl(cygnus_gpio->base +
> +				(i * GPIO_BANK_SIZE) +
> +				CYGNUS_GPIO_INT_MSTAT_OFFSET);
> +		if (val) {

This if (val) and indentation isn't really necessary

> +			for_each_set_bit(bit, &val, 32) {

for_each_set_bit will effectively do the if above.

32 bit only code?
otherwise isn't this endian unsafe?

> +				unsigned pin = NGPIOS_PER_BANK * i + bit;
> +				int child_irq =	bcm_cygnus_gpio_to_irq(
> +						&cygnus_gpio->gc, pin);
> +
> +				/*
> +				 * Clear the interrupt before invoking the
> +				 * handler, so we do not leave any window
> +				 */
> +				writel(1 << bit,
> +					cygnus_gpio->base +
> +					(i * GPIO_BANK_SIZE) +
> +					CYGNUS_GPIO_INT_CLR_OFFSET);
> +
> +				generic_handle_irq(child_irq);
> +			}
> +
> +		}
> +	}
> +
> +	chained_irq_exit(chip, desc);
> +}
> +
> +static void bcm_cygnus_gpio_irq_ack(struct irq_data *d)
> +{
> +	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
> +	unsigned gpio = d->hwirq;
> +	unsigned int offset, shift;
> +	u32 val;
> +
> +	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +		CYGNUS_GPIO_INT_CLR_OFFSET;
> +	shift = __gpio_bitpos(cygnus_gpio, gpio);
> +
> +	val = 1 << shift;
> +	writel(val, cygnus_gpio->base + offset);
> +
> +	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
> +			offset, shift);
> +}

> +static struct irq_chip bcm_cygnus_gpio_irq_chip = {
> +	.name = "bcm-cygnus-gpio",
> +	.irq_ack = bcm_cygnus_gpio_irq_ack,
> +	.irq_mask = bcm_cygnus_gpio_irq_mask,
> +	.irq_unmask = bcm_cygnus_gpio_irq_unmask,
> +	.irq_set_type = bcm_cygnus_gpio_irq_set_type,
> +};

const?

> +static struct irq_domain_ops bcm_cygnus_irq_ops = {
> +	.map = bcm_cygnus_gpio_irq_map,
> +	.unmap = bcm_cygnus_gpio_irq_unmap,
> +	.xlate = irq_domain_xlate_twocell,
> +};

const here too?

> +#ifdef CONFIG_OF_GPIO
> +static void bcm_cygnus_gpio_set_pull(struct bcm_cygnus_gpio *cygnus_gpio,
> +		unsigned gpio, enum gpio_pull pull)
> +{
> +	unsigned int offset, shift;
> +	u32 val, up;

	bool up; ?

> +	unsigned long flags;
> +
> +	switch (pull) {
> +	case GPIO_PULL_NONE:
> +		return;
> +	case GPIO_PULL_UP:
> +		up = 1;
> +		break;
> +	case GPIO_PULL_DOWN:
> +		up = 0;
> +		break;
> +	case GPIO_PULL_INVALID:
> +	default:
> +		return;
> +	}

Maybe more sensible to group GPIO_PULL_NONE with GPIO_PULL_INVALID


> +static int bcm_cygnus_gpio_probe(struct platform_device *pdev)
> +{
[]
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	if (!res) {
> +		dev_err(&pdev->dev, "unable to get I/O resource");

missing newline

[PATCH 2/5] gpio: Cygnus: add GPIO driver

[Joe Perches]

On Fri, 2014-12-05 at 16:40 -0800, Ray Jui wrote:
> This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
> SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller
> ("brcm,cygnus-asiu-gpio"), 2) the chipCommonG GPIO controller
> ("brcm,cygnus-ccm-gpio"), and 3) the ALWAYS-ON GPIO controller
> ("brcm,cygnus-crmu-gpio")

trivia:

> diff --git a/drivers/gpio/gpio-bcm-cygnus.c b/drivers/gpio/gpio-bcm-cygnus.c

> +static inline struct bcm_cygnus_gpio *to_bcm_cygnus_gpio(
> +		struct gpio_chip *gc)
> +{
> +	return container_of(gc, struct bcm_cygnus_gpio, gc);
> +}

Probably all of these inlines can just be static.

The compiler does a pretty good job these days
of inlining where appropriate.


> +static void bcm_cygnus_gpio_irq_handler(unsigned int irq,
> +		struct irq_desc *desc)
> +{
> +	struct bcm_cygnus_gpio *cygnus_gpio;
> +	struct irq_chip *chip = irq_desc_get_chip(desc);
> +	int i, bit;
> +
> +	chained_irq_enter(chip, desc);
> +
> +	cygnus_gpio = irq_get_handler_data(irq);
> +
> +	/* go through the entire GPIO banks and handle all interrupts */
> +	for (i = 0; i < cygnus_gpio->num_banks; i++) {
> +		unsigned long val = readl(cygnus_gpio->base +
> +				(i * GPIO_BANK_SIZE) +
> +				CYGNUS_GPIO_INT_MSTAT_OFFSET);
> +		if (val) {

This if (val) and indentation isn't really necessary

> +			for_each_set_bit(bit, &val, 32) {

for_each_set_bit will effectively do the if above.

32 bit only code?
otherwise isn't this endian unsafe?

> +				unsigned pin = NGPIOS_PER_BANK * i + bit;
> +				int child_irq =	bcm_cygnus_gpio_to_irq(
> +						&cygnus_gpio->gc, pin);
> +
> +				/*
> +				 * Clear the interrupt before invoking the
> +				 * handler, so we do not leave any window
> +				 */
> +				writel(1 << bit,
> +					cygnus_gpio->base +
> +					(i * GPIO_BANK_SIZE) +
> +					CYGNUS_GPIO_INT_CLR_OFFSET);
> +
> +				generic_handle_irq(child_irq);
> +			}
> +
> +		}
> +	}
> +
> +	chained_irq_exit(chip, desc);
> +}
> +
> +static void bcm_cygnus_gpio_irq_ack(struct irq_data *d)
> +{
> +	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
> +	unsigned gpio = d->hwirq;
> +	unsigned int offset, shift;
> +	u32 val;
> +
> +	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +		CYGNUS_GPIO_INT_CLR_OFFSET;
> +	shift = __gpio_bitpos(cygnus_gpio, gpio);
> +
> +	val = 1 << shift;
> +	writel(val, cygnus_gpio->base + offset);
> +
> +	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
> +			offset, shift);
> +}

> +static struct irq_chip bcm_cygnus_gpio_irq_chip = {
> +	.name = "bcm-cygnus-gpio",
> +	.irq_ack = bcm_cygnus_gpio_irq_ack,
> +	.irq_mask = bcm_cygnus_gpio_irq_mask,
> +	.irq_unmask = bcm_cygnus_gpio_irq_unmask,
> +	.irq_set_type = bcm_cygnus_gpio_irq_set_type,
> +};

const?

> +static struct irq_domain_ops bcm_cygnus_irq_ops = {
> +	.map = bcm_cygnus_gpio_irq_map,
> +	.unmap = bcm_cygnus_gpio_irq_unmap,
> +	.xlate = irq_domain_xlate_twocell,
> +};

const here too?

> +#ifdef CONFIG_OF_GPIO
> +static void bcm_cygnus_gpio_set_pull(struct bcm_cygnus_gpio *cygnus_gpio,
> +		unsigned gpio, enum gpio_pull pull)
> +{
> +	unsigned int offset, shift;
> +	u32 val, up;

	bool up; ?

> +	unsigned long flags;
> +
> +	switch (pull) {
> +	case GPIO_PULL_NONE:
> +		return;
> +	case GPIO_PULL_UP:
> +		up = 1;
> +		break;
> +	case GPIO_PULL_DOWN:
> +		up = 0;
> +		break;
> +	case GPIO_PULL_INVALID:
> +	default:
> +		return;
> +	}

Maybe more sensible to group GPIO_PULL_NONE with GPIO_PULL_INVALID


> +static int bcm_cygnus_gpio_probe(struct platform_device *pdev)
> +{
[]
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	if (!res) {
> +		dev_err(&pdev->dev, "unable to get I/O resource");

missing newline

Re: [PATCH 2/5] gpio: Cygnus: add GPIO driver

[Ray Jui]

Thanks for your review, Joe:

On 12/5/2014 5:28 PM, Joe Perches wrote:
> On Fri, 2014-12-05 at 16:40 -0800, Ray Jui wrote:
>> This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
>> SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller
>> ("brcm,cygnus-asiu-gpio"), 2) the chipCommonG GPIO controller
>> ("brcm,cygnus-ccm-gpio"), and 3) the ALWAYS-ON GPIO controller
>> ("brcm,cygnus-crmu-gpio")
>
> trivia:
>
>> diff --git a/drivers/gpio/gpio-bcm-cygnus.c b/drivers/gpio/gpio-bcm-cygnus.c
>
>> +static inline struct bcm_cygnus_gpio *to_bcm_cygnus_gpio(
>> +		struct gpio_chip *gc)
>> +{
>> +	return container_of(gc, struct bcm_cygnus_gpio, gc);
>> +}
>
> Probably all of these inlines can just be static.
>
> The compiler does a pretty good job these days
> of inlining where appropriate.

Okay I can remove all inlines.

>
>
>> +static void bcm_cygnus_gpio_irq_handler(unsigned int irq,
>> +		struct irq_desc *desc)
>> +{
>> +	struct bcm_cygnus_gpio *cygnus_gpio;
>> +	struct irq_chip *chip = irq_desc_get_chip(desc);
>> +	int i, bit;
>> +
>> +	chained_irq_enter(chip, desc);
>> +
>> +	cygnus_gpio = irq_get_handler_data(irq);
>> +
>> +	/* go through the entire GPIO banks and handle all interrupts */
>> +	for (i = 0; i < cygnus_gpio->num_banks; i++) {
>> +		unsigned long val = readl(cygnus_gpio->base +
>> +				(i * GPIO_BANK_SIZE) +
>> +				CYGNUS_GPIO_INT_MSTAT_OFFSET);
>> +		if (val) {
>
> This if (val) and indentation isn't really necessary
>

Note for_each_set_bit in this case iterates 32 times searching for bits 
that are set. By having the if (val) check here, it can potentially save 
some of such processing in the ISR. I agree with you that it introduces 
one extra indent here but I think it's required.

>> +			for_each_set_bit(bit, &val, 32) {
>
> for_each_set_bit will effectively do the if above.
>
> 32 bit only code?
> otherwise isn't this endian unsafe?
>

Will change 'unsigned long val' to 'u32 val'.

>> +				unsigned pin = NGPIOS_PER_BANK * i + bit;
>> +				int child_irq =	bcm_cygnus_gpio_to_irq(
>> +						&cygnus_gpio->gc, pin);
>> +
>> +				/*
>> +				 * Clear the interrupt before invoking the
>> +				 * handler, so we do not leave any window
>> +				 */
>> +				writel(1 << bit,
>> +					cygnus_gpio->base +
>> +					(i * GPIO_BANK_SIZE) +
>> +					CYGNUS_GPIO_INT_CLR_OFFSET);
>> +
>> +				generic_handle_irq(child_irq);
>> +			}
>> +
>> +		}
>> +	}
>> +
>> +	chained_irq_exit(chip, desc);
>> +}
>> +
>> +static void bcm_cygnus_gpio_irq_ack(struct irq_data *d)
>> +{
>> +	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
>> +	unsigned gpio = d->hwirq;
>> +	unsigned int offset, shift;
>> +	u32 val;
>> +
>> +	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +		CYGNUS_GPIO_INT_CLR_OFFSET;
>> +	shift = __gpio_bitpos(cygnus_gpio, gpio);
>> +
>> +	val = 1 << shift;
>> +	writel(val, cygnus_gpio->base + offset);
>> +
>> +	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
>> +			offset, shift);
>> +}
>
>> +static struct irq_chip bcm_cygnus_gpio_irq_chip = {
>> +	.name = "bcm-cygnus-gpio",
>> +	.irq_ack = bcm_cygnus_gpio_irq_ack,
>> +	.irq_mask = bcm_cygnus_gpio_irq_mask,
>> +	.irq_unmask = bcm_cygnus_gpio_irq_unmask,
>> +	.irq_set_type = bcm_cygnus_gpio_irq_set_type,
>> +};
>
> const?
>


Sure, will add const to bcm_cygnus_gpio_irq_chip

>> +static struct irq_domain_ops bcm_cygnus_irq_ops = {
>> +	.map = bcm_cygnus_gpio_irq_map,
>> +	.unmap = bcm_cygnus_gpio_irq_unmap,
>> +	.xlate = irq_domain_xlate_twocell,
>> +};
>
> const here too?
>

Yes, will make bcm_cygnus_irq_ops const.

>> +#ifdef CONFIG_OF_GPIO
>> +static void bcm_cygnus_gpio_set_pull(struct bcm_cygnus_gpio *cygnus_gpio,
>> +		unsigned gpio, enum gpio_pull pull)
>> +{
>> +	unsigned int offset, shift;
>> +	u32 val, up;
>
> 	bool up; ?
>

Okay I'll change the name from 'up' to 'pullup' to make it more readable.

>> +	unsigned long flags;
>> +
>> +	switch (pull) {
>> +	case GPIO_PULL_NONE:
>> +		return;
>> +	case GPIO_PULL_UP:
>> +		up = 1;
>> +		break;
>> +	case GPIO_PULL_DOWN:
>> +		up = 0;
>> +		break;
>> +	case GPIO_PULL_INVALID:
>> +	default:
>> +		return;
>> +	}
>
> Maybe more sensible to group GPIO_PULL_NONE with GPIO_PULL_INVALID
>
>

Good suggestion, will do the following:

case GPIO_PULL_NONE:
case GPIO_PULL_INVALID:
default:
        return;

>> +static int bcm_cygnus_gpio_probe(struct platform_device *pdev)
>> +{
> []
>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +	if (!res) {
>> +		dev_err(&pdev->dev, "unable to get I/O resource");
>
> missing newline
>
>

Right, will fix it with dev_err(&pdev->dev, "unable to get I/O resource\n");

Re: [PATCH 2/5] gpio: Cygnus: add GPIO driver

[Ray Jui]

Thanks for your review, Joe:

On 12/5/2014 5:28 PM, Joe Perches wrote:
> On Fri, 2014-12-05 at 16:40 -0800, Ray Jui wrote:
>> This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
>> SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller
>> ("brcm,cygnus-asiu-gpio"), 2) the chipCommonG GPIO controller
>> ("brcm,cygnus-ccm-gpio"), and 3) the ALWAYS-ON GPIO controller
>> ("brcm,cygnus-crmu-gpio")
>
> trivia:
>
>> diff --git a/drivers/gpio/gpio-bcm-cygnus.c b/drivers/gpio/gpio-bcm-cygnus.c
>
>> +static inline struct bcm_cygnus_gpio *to_bcm_cygnus_gpio(
>> +		struct gpio_chip *gc)
>> +{
>> +	return container_of(gc, struct bcm_cygnus_gpio, gc);
>> +}
>
> Probably all of these inlines can just be static.
>
> The compiler does a pretty good job these days
> of inlining where appropriate.

Okay I can remove all inlines.

>
>
>> +static void bcm_cygnus_gpio_irq_handler(unsigned int irq,
>> +		struct irq_desc *desc)
>> +{
>> +	struct bcm_cygnus_gpio *cygnus_gpio;
>> +	struct irq_chip *chip = irq_desc_get_chip(desc);
>> +	int i, bit;
>> +
>> +	chained_irq_enter(chip, desc);
>> +
>> +	cygnus_gpio = irq_get_handler_data(irq);
>> +
>> +	/* go through the entire GPIO banks and handle all interrupts */
>> +	for (i = 0; i < cygnus_gpio->num_banks; i++) {
>> +		unsigned long val = readl(cygnus_gpio->base +
>> +				(i * GPIO_BANK_SIZE) +
>> +				CYGNUS_GPIO_INT_MSTAT_OFFSET);
>> +		if (val) {
>
> This if (val) and indentation isn't really necessary
>

Note for_each_set_bit in this case iterates 32 times searching for bits 
that are set. By having the if (val) check here, it can potentially save 
some of such processing in the ISR. I agree with you that it introduces 
one extra indent here but I think it's required.

>> +			for_each_set_bit(bit, &val, 32) {
>
> for_each_set_bit will effectively do the if above.
>
> 32 bit only code?
> otherwise isn't this endian unsafe?
>

Will change 'unsigned long val' to 'u32 val'.

>> +				unsigned pin = NGPIOS_PER_BANK * i + bit;
>> +				int child_irq =	bcm_cygnus_gpio_to_irq(
>> +						&cygnus_gpio->gc, pin);
>> +
>> +				/*
>> +				 * Clear the interrupt before invoking the
>> +				 * handler, so we do not leave any window
>> +				 */
>> +				writel(1 << bit,
>> +					cygnus_gpio->base +
>> +					(i * GPIO_BANK_SIZE) +
>> +					CYGNUS_GPIO_INT_CLR_OFFSET);
>> +
>> +				generic_handle_irq(child_irq);
>> +			}
>> +
>> +		}
>> +	}
>> +
>> +	chained_irq_exit(chip, desc);
>> +}
>> +
>> +static void bcm_cygnus_gpio_irq_ack(struct irq_data *d)
>> +{
>> +	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
>> +	unsigned gpio = d->hwirq;
>> +	unsigned int offset, shift;
>> +	u32 val;
>> +
>> +	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +		CYGNUS_GPIO_INT_CLR_OFFSET;
>> +	shift = __gpio_bitpos(cygnus_gpio, gpio);
>> +
>> +	val = 1 << shift;
>> +	writel(val, cygnus_gpio->base + offset);
>> +
>> +	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
>> +			offset, shift);
>> +}
>
>> +static struct irq_chip bcm_cygnus_gpio_irq_chip = {
>> +	.name = "bcm-cygnus-gpio",
>> +	.irq_ack = bcm_cygnus_gpio_irq_ack,
>> +	.irq_mask = bcm_cygnus_gpio_irq_mask,
>> +	.irq_unmask = bcm_cygnus_gpio_irq_unmask,
>> +	.irq_set_type = bcm_cygnus_gpio_irq_set_type,
>> +};
>
> const?
>


Sure, will add const to bcm_cygnus_gpio_irq_chip

>> +static struct irq_domain_ops bcm_cygnus_irq_ops = {
>> +	.map = bcm_cygnus_gpio_irq_map,
>> +	.unmap = bcm_cygnus_gpio_irq_unmap,
>> +	.xlate = irq_domain_xlate_twocell,
>> +};
>
> const here too?
>

Yes, will make bcm_cygnus_irq_ops const.

>> +#ifdef CONFIG_OF_GPIO
>> +static void bcm_cygnus_gpio_set_pull(struct bcm_cygnus_gpio *cygnus_gpio,
>> +		unsigned gpio, enum gpio_pull pull)
>> +{
>> +	unsigned int offset, shift;
>> +	u32 val, up;
>
> 	bool up; ?
>

Okay I'll change the name from 'up' to 'pullup' to make it more readable.

>> +	unsigned long flags;
>> +
>> +	switch (pull) {
>> +	case GPIO_PULL_NONE:
>> +		return;
>> +	case GPIO_PULL_UP:
>> +		up = 1;
>> +		break;
>> +	case GPIO_PULL_DOWN:
>> +		up = 0;
>> +		break;
>> +	case GPIO_PULL_INVALID:
>> +	default:
>> +		return;
>> +	}
>
> Maybe more sensible to group GPIO_PULL_NONE with GPIO_PULL_INVALID
>
>

Good suggestion, will do the following:

case GPIO_PULL_NONE:
case GPIO_PULL_INVALID:
default:
        return;

>> +static int bcm_cygnus_gpio_probe(struct platform_device *pdev)
>> +{
> []
>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +	if (!res) {
>> +		dev_err(&pdev->dev, "unable to get I/O resource");
>
> missing newline
>
>

Right, will fix it with dev_err(&pdev->dev, "unable to get I/O resource\n");

[PATCH 2/5] gpio: Cygnus: add GPIO driver

[Ray Jui]

Thanks for your review, Joe:

On 12/5/2014 5:28 PM, Joe Perches wrote:
> On Fri, 2014-12-05 at 16:40 -0800, Ray Jui wrote:
>> This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
>> SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller
>> ("brcm,cygnus-asiu-gpio"), 2) the chipCommonG GPIO controller
>> ("brcm,cygnus-ccm-gpio"), and 3) the ALWAYS-ON GPIO controller
>> ("brcm,cygnus-crmu-gpio")
>
> trivia:
>
>> diff --git a/drivers/gpio/gpio-bcm-cygnus.c b/drivers/gpio/gpio-bcm-cygnus.c
>
>> +static inline struct bcm_cygnus_gpio *to_bcm_cygnus_gpio(
>> +		struct gpio_chip *gc)
>> +{
>> +	return container_of(gc, struct bcm_cygnus_gpio, gc);
>> +}
>
> Probably all of these inlines can just be static.
>
> The compiler does a pretty good job these days
> of inlining where appropriate.

Okay I can remove all inlines.

>
>
>> +static void bcm_cygnus_gpio_irq_handler(unsigned int irq,
>> +		struct irq_desc *desc)
>> +{
>> +	struct bcm_cygnus_gpio *cygnus_gpio;
>> +	struct irq_chip *chip = irq_desc_get_chip(desc);
>> +	int i, bit;
>> +
>> +	chained_irq_enter(chip, desc);
>> +
>> +	cygnus_gpio = irq_get_handler_data(irq);
>> +
>> +	/* go through the entire GPIO banks and handle all interrupts */
>> +	for (i = 0; i < cygnus_gpio->num_banks; i++) {
>> +		unsigned long val = readl(cygnus_gpio->base +
>> +				(i * GPIO_BANK_SIZE) +
>> +				CYGNUS_GPIO_INT_MSTAT_OFFSET);
>> +		if (val) {
>
> This if (val) and indentation isn't really necessary
>

Note for_each_set_bit in this case iterates 32 times searching for bits 
that are set. By having the if (val) check here, it can potentially save 
some of such processing in the ISR. I agree with you that it introduces 
one extra indent here but I think it's required.

>> +			for_each_set_bit(bit, &val, 32) {
>
> for_each_set_bit will effectively do the if above.
>
> 32 bit only code?
> otherwise isn't this endian unsafe?
>

Will change 'unsigned long val' to 'u32 val'.

>> +				unsigned pin = NGPIOS_PER_BANK * i + bit;
>> +				int child_irq =	bcm_cygnus_gpio_to_irq(
>> +						&cygnus_gpio->gc, pin);
>> +
>> +				/*
>> +				 * Clear the interrupt before invoking the
>> +				 * handler, so we do not leave any window
>> +				 */
>> +				writel(1 << bit,
>> +					cygnus_gpio->base +
>> +					(i * GPIO_BANK_SIZE) +
>> +					CYGNUS_GPIO_INT_CLR_OFFSET);
>> +
>> +				generic_handle_irq(child_irq);
>> +			}
>> +
>> +		}
>> +	}
>> +
>> +	chained_irq_exit(chip, desc);
>> +}
>> +
>> +static void bcm_cygnus_gpio_irq_ack(struct irq_data *d)
>> +{
>> +	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
>> +	unsigned gpio = d->hwirq;
>> +	unsigned int offset, shift;
>> +	u32 val;
>> +
>> +	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +		CYGNUS_GPIO_INT_CLR_OFFSET;
>> +	shift = __gpio_bitpos(cygnus_gpio, gpio);
>> +
>> +	val = 1 << shift;
>> +	writel(val, cygnus_gpio->base + offset);
>> +
>> +	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
>> +			offset, shift);
>> +}
>
>> +static struct irq_chip bcm_cygnus_gpio_irq_chip = {
>> +	.name = "bcm-cygnus-gpio",
>> +	.irq_ack = bcm_cygnus_gpio_irq_ack,
>> +	.irq_mask = bcm_cygnus_gpio_irq_mask,
>> +	.irq_unmask = bcm_cygnus_gpio_irq_unmask,
>> +	.irq_set_type = bcm_cygnus_gpio_irq_set_type,
>> +};
>
> const?
>


Sure, will add const to bcm_cygnus_gpio_irq_chip

>> +static struct irq_domain_ops bcm_cygnus_irq_ops = {
>> +	.map = bcm_cygnus_gpio_irq_map,
>> +	.unmap = bcm_cygnus_gpio_irq_unmap,
>> +	.xlate = irq_domain_xlate_twocell,
>> +};
>
> const here too?
>

Yes, will make bcm_cygnus_irq_ops const.

>> +#ifdef CONFIG_OF_GPIO
>> +static void bcm_cygnus_gpio_set_pull(struct bcm_cygnus_gpio *cygnus_gpio,
>> +		unsigned gpio, enum gpio_pull pull)
>> +{
>> +	unsigned int offset, shift;
>> +	u32 val, up;
>
> 	bool up; ?
>

Okay I'll change the name from 'up' to 'pullup' to make it more readable.

>> +	unsigned long flags;
>> +
>> +	switch (pull) {
>> +	case GPIO_PULL_NONE:
>> +		return;
>> +	case GPIO_PULL_UP:
>> +		up = 1;
>> +		break;
>> +	case GPIO_PULL_DOWN:
>> +		up = 0;
>> +		break;
>> +	case GPIO_PULL_INVALID:
>> +	default:
>> +		return;
>> +	}
>
> Maybe more sensible to group GPIO_PULL_NONE with GPIO_PULL_INVALID
>
>

Good suggestion, will do the following:

case GPIO_PULL_NONE:
case GPIO_PULL_INVALID:
default:
        return;

>> +static int bcm_cygnus_gpio_probe(struct platform_device *pdev)
>> +{
> []
>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +	if (!res) {
>> +		dev_err(&pdev->dev, "unable to get I/O resource");
>
> missing newline
>
>

Right, will fix it with dev_err(&pdev->dev, "unable to get I/O resource\n");

Re: [PATCH 2/5] gpio: Cygnus: add GPIO driver

[Joe Perches]

On Fri, 2014-12-05 at 18:14 -0800, Ray Jui wrote:
> On 12/5/2014 5:28 PM, Joe Perches wrote:
> > On Fri, 2014-12-05 at 16:40 -0800, Ray Jui wrote:
> >> +static void bcm_cygnus_gpio_irq_handler(unsigned int irq,
> >> +		struct irq_desc *desc)
> >> +{
> >> +	struct bcm_cygnus_gpio *cygnus_gpio;
> >> +	struct irq_chip *chip = irq_desc_get_chip(desc);
> >> +	int i, bit;
> >> +
> >> +	chained_irq_enter(chip, desc);
> >> +
> >> +	cygnus_gpio = irq_get_handler_data(irq);
> >> +
> >> +	/* go through the entire GPIO banks and handle all interrupts */
> >> +	for (i = 0; i < cygnus_gpio->num_banks; i++) {
> >> +		unsigned long val = readl(cygnus_gpio->base +
> >> +				(i * GPIO_BANK_SIZE) +
> >> +				CYGNUS_GPIO_INT_MSTAT_OFFSET);
> >> +		if (val) {
> >
> > This if (val) and indentation isn't really necessary
> >
> 
> Note for_each_set_bit in this case iterates 32 times searching for bits 
> that are set.

No it doesn't.

#define for_each_set_bit(bit, addr, size) \
	for ((bit) = find_first_bit((addr), (size));		\
	     (bit) < (size);					\
	     (bit) = find_next_bit((addr), (size), (bit) + 1))

find_first_bit:

 * Returns the bit number of the first set bit.
 * If no bits are set, returns @size.

>  By having the if (val) check here, it can potentially save 
> some of such processing in the ISR. I agree with you that it introduces 
> one extra indent here but I think it's required.
> 
> >> +			for_each_set_bit(bit, &val, 32) {
> >
> > for_each_set_bit will effectively do the if above.
> >
> > 32 bit only code?
> > otherwise isn't this endian unsafe?
> >
> 
> Will change 'unsigned long val' to 'u32 val'.

All the bit operations only work on long *

[PATCH 2/5] gpio: Cygnus: add GPIO driver

[Joe Perches]

On Fri, 2014-12-05 at 18:14 -0800, Ray Jui wrote:
> On 12/5/2014 5:28 PM, Joe Perches wrote:
> > On Fri, 2014-12-05 at 16:40 -0800, Ray Jui wrote:
> >> +static void bcm_cygnus_gpio_irq_handler(unsigned int irq,
> >> +		struct irq_desc *desc)
> >> +{
> >> +	struct bcm_cygnus_gpio *cygnus_gpio;
> >> +	struct irq_chip *chip = irq_desc_get_chip(desc);
> >> +	int i, bit;
> >> +
> >> +	chained_irq_enter(chip, desc);
> >> +
> >> +	cygnus_gpio = irq_get_handler_data(irq);
> >> +
> >> +	/* go through the entire GPIO banks and handle all interrupts */
> >> +	for (i = 0; i < cygnus_gpio->num_banks; i++) {
> >> +		unsigned long val = readl(cygnus_gpio->base +
> >> +				(i * GPIO_BANK_SIZE) +
> >> +				CYGNUS_GPIO_INT_MSTAT_OFFSET);
> >> +		if (val) {
> >
> > This if (val) and indentation isn't really necessary
> >
> 
> Note for_each_set_bit in this case iterates 32 times searching for bits 
> that are set.

No it doesn't.

#define for_each_set_bit(bit, addr, size) \
	for ((bit) = find_first_bit((addr), (size));		\
	     (bit) < (size);					\
	     (bit) = find_next_bit((addr), (size), (bit) + 1))

find_first_bit:

 * Returns the bit number of the first set bit.
 * If no bits are set, returns @size.

>  By having the if (val) check here, it can potentially save 
> some of such processing in the ISR. I agree with you that it introduces 
> one extra indent here but I think it's required.
> 
> >> +			for_each_set_bit(bit, &val, 32) {
> >
> > for_each_set_bit will effectively do the if above.
> >
> > 32 bit only code?
> > otherwise isn't this endian unsafe?
> >
> 
> Will change 'unsigned long val' to 'u32 val'.

All the bit operations only work on long *

Re: [PATCH 2/5] gpio: Cygnus: add GPIO driver

[Ray Jui]

On 12/5/2014 6:34 PM, Joe Perches wrote:
> On Fri, 2014-12-05 at 18:14 -0800, Ray Jui wrote:
>> On 12/5/2014 5:28 PM, Joe Perches wrote:
>>> On Fri, 2014-12-05 at 16:40 -0800, Ray Jui wrote:
>>>> +static void bcm_cygnus_gpio_irq_handler(unsigned int irq,
>>>> +		struct irq_desc *desc)
>>>> +{
>>>> +	struct bcm_cygnus_gpio *cygnus_gpio;
>>>> +	struct irq_chip *chip = irq_desc_get_chip(desc);
>>>> +	int i, bit;
>>>> +
>>>> +	chained_irq_enter(chip, desc);
>>>> +
>>>> +	cygnus_gpio = irq_get_handler_data(irq);
>>>> +
>>>> +	/* go through the entire GPIO banks and handle all interrupts */
>>>> +	for (i = 0; i < cygnus_gpio->num_banks; i++) {
>>>> +		unsigned long val = readl(cygnus_gpio->base +
>>>> +				(i * GPIO_BANK_SIZE) +
>>>> +				CYGNUS_GPIO_INT_MSTAT_OFFSET);
>>>> +		if (val) {
>>>
>>> This if (val) and indentation isn't really necessary
>>>
>>
>> Note for_each_set_bit in this case iterates 32 times searching for bits
>> that are set.
>
> No it doesn't.
>
> #define for_each_set_bit(bit, addr, size) \
> 	for ((bit) = find_first_bit((addr), (size));		\
> 	     (bit) < (size);					\
> 	     (bit) = find_next_bit((addr), (size), (bit) + 1))
>
> find_first_bit:
>
>   * Returns the bit number of the first set bit.
>   * If no bits are set, returns @size.
>

You are right. I reviewed for_each_set_bit but didn't notice 
find_next_bit may simply return 32 in our case without doing any 
iterative processing. I will get rid of the redundant if (val) check below.

>>   By having the if (val) check here, it can potentially save
>> some of such processing in the ISR. I agree with you that it introduces
>> one extra indent here but I think it's required.
>>
>>>> +			for_each_set_bit(bit, &val, 32) {
>>>
>>> for_each_set_bit will effectively do the if above.
>>>
>>> 32 bit only code?
>>> otherwise isn't this endian unsafe?
>>>
>>
>> Will change 'unsigned long val' to 'u32 val'.
>
> All the bit operations only work on long *
>
>

Actually, by reviewing the code more deeply, I'm not sure why using 
for_each_set_bit here is 'endian unsafe'. Isn't that already taken care 
of by macros in bitops.h? Sorry if I'm still missing something here...

Re: [PATCH 2/5] gpio: Cygnus: add GPIO driver

[Ray Jui]

On 12/5/2014 6:34 PM, Joe Perches wrote:
> On Fri, 2014-12-05 at 18:14 -0800, Ray Jui wrote:
>> On 12/5/2014 5:28 PM, Joe Perches wrote:
>>> On Fri, 2014-12-05 at 16:40 -0800, Ray Jui wrote:
>>>> +static void bcm_cygnus_gpio_irq_handler(unsigned int irq,
>>>> +		struct irq_desc *desc)
>>>> +{
>>>> +	struct bcm_cygnus_gpio *cygnus_gpio;
>>>> +	struct irq_chip *chip = irq_desc_get_chip(desc);
>>>> +	int i, bit;
>>>> +
>>>> +	chained_irq_enter(chip, desc);
>>>> +
>>>> +	cygnus_gpio = irq_get_handler_data(irq);
>>>> +
>>>> +	/* go through the entire GPIO banks and handle all interrupts */
>>>> +	for (i = 0; i < cygnus_gpio->num_banks; i++) {
>>>> +		unsigned long val = readl(cygnus_gpio->base +
>>>> +				(i * GPIO_BANK_SIZE) +
>>>> +				CYGNUS_GPIO_INT_MSTAT_OFFSET);
>>>> +		if (val) {
>>>
>>> This if (val) and indentation isn't really necessary
>>>
>>
>> Note for_each_set_bit in this case iterates 32 times searching for bits
>> that are set.
>
> No it doesn't.
>
> #define for_each_set_bit(bit, addr, size) \
> 	for ((bit) = find_first_bit((addr), (size));		\
> 	     (bit) < (size);					\
> 	     (bit) = find_next_bit((addr), (size), (bit) + 1))
>
> find_first_bit:
>
>   * Returns the bit number of the first set bit.
>   * If no bits are set, returns @size.
>

You are right. I reviewed for_each_set_bit but didn't notice 
find_next_bit may simply return 32 in our case without doing any 
iterative processing. I will get rid of the redundant if (val) check below.

>>   By having the if (val) check here, it can potentially save
>> some of such processing in the ISR. I agree with you that it introduces
>> one extra indent here but I think it's required.
>>
>>>> +			for_each_set_bit(bit, &val, 32) {
>>>
>>> for_each_set_bit will effectively do the if above.
>>>
>>> 32 bit only code?
>>> otherwise isn't this endian unsafe?
>>>
>>
>> Will change 'unsigned long val' to 'u32 val'.
>
> All the bit operations only work on long *
>
>

Actually, by reviewing the code more deeply, I'm not sure why using 
for_each_set_bit here is 'endian unsafe'. Isn't that already taken care 
of by macros in bitops.h? Sorry if I'm still missing something here...

[PATCH 2/5] gpio: Cygnus: add GPIO driver

[Ray Jui]

On 12/5/2014 6:34 PM, Joe Perches wrote:
> On Fri, 2014-12-05 at 18:14 -0800, Ray Jui wrote:
>> On 12/5/2014 5:28 PM, Joe Perches wrote:
>>> On Fri, 2014-12-05 at 16:40 -0800, Ray Jui wrote:
>>>> +static void bcm_cygnus_gpio_irq_handler(unsigned int irq,
>>>> +		struct irq_desc *desc)
>>>> +{
>>>> +	struct bcm_cygnus_gpio *cygnus_gpio;
>>>> +	struct irq_chip *chip = irq_desc_get_chip(desc);
>>>> +	int i, bit;
>>>> +
>>>> +	chained_irq_enter(chip, desc);
>>>> +
>>>> +	cygnus_gpio = irq_get_handler_data(irq);
>>>> +
>>>> +	/* go through the entire GPIO banks and handle all interrupts */
>>>> +	for (i = 0; i < cygnus_gpio->num_banks; i++) {
>>>> +		unsigned long val = readl(cygnus_gpio->base +
>>>> +				(i * GPIO_BANK_SIZE) +
>>>> +				CYGNUS_GPIO_INT_MSTAT_OFFSET);
>>>> +		if (val) {
>>>
>>> This if (val) and indentation isn't really necessary
>>>
>>
>> Note for_each_set_bit in this case iterates 32 times searching for bits
>> that are set.
>
> No it doesn't.
>
> #define for_each_set_bit(bit, addr, size) \
> 	for ((bit) = find_first_bit((addr), (size));		\
> 	     (bit) < (size);					\
> 	     (bit) = find_next_bit((addr), (size), (bit) + 1))
>
> find_first_bit:
>
>   * Returns the bit number of the first set bit.
>   * If no bits are set, returns @size.
>

You are right. I reviewed for_each_set_bit but didn't notice 
find_next_bit may simply return 32 in our case without doing any 
iterative processing. I will get rid of the redundant if (val) check below.

>>   By having the if (val) check here, it can potentially save
>> some of such processing in the ISR. I agree with you that it introduces
>> one extra indent here but I think it's required.
>>
>>>> +			for_each_set_bit(bit, &val, 32) {
>>>
>>> for_each_set_bit will effectively do the if above.
>>>
>>> 32 bit only code?
>>> otherwise isn't this endian unsafe?
>>>
>>
>> Will change 'unsigned long val' to 'u32 val'.
>
> All the bit operations only work on long *
>
>

Actually, by reviewing the code more deeply, I'm not sure why using 
for_each_set_bit here is 'endian unsafe'. Isn't that already taken care 
of by macros in bitops.h? Sorry if I'm still missing something here...

Re: [PATCH 2/5] gpio: Cygnus: add GPIO driver

[Joe Perches]

On Fri, 2014-12-05 at 19:41 -0800, Ray Jui wrote:
> On 12/5/2014 6:34 PM, Joe Perches wrote:
> > On Fri, 2014-12-05 at 18:14 -0800, Ray Jui wrote:
> >> On 12/5/2014 5:28 PM, Joe Perches wrote:
> >>> On Fri, 2014-12-05 at 16:40 -0800, Ray Jui wrote:
> >>>> +			for_each_set_bit(bit, &val, 32) {
[]
> Actually, by reviewing the code more deeply, I'm not sure why using 
> for_each_set_bit here is 'endian unsafe'.

It's not.  The 32 confused me as it was long
and sizeof(long) isn't necessarily 32.

Maybe the 32 should be a #define

[PATCH 2/5] gpio: Cygnus: add GPIO driver

[Joe Perches]

On Fri, 2014-12-05 at 19:41 -0800, Ray Jui wrote:
> On 12/5/2014 6:34 PM, Joe Perches wrote:
> > On Fri, 2014-12-05 at 18:14 -0800, Ray Jui wrote:
> >> On 12/5/2014 5:28 PM, Joe Perches wrote:
> >>> On Fri, 2014-12-05 at 16:40 -0800, Ray Jui wrote:
> >>>> +			for_each_set_bit(bit, &val, 32) {
[]
> Actually, by reviewing the code more deeply, I'm not sure why using 
> for_each_set_bit here is 'endian unsafe'.

It's not.  The 32 confused me as it was long
and sizeof(long) isn't necessarily 32.

Maybe the 32 should be a #define

Re: [PATCH 2/4] clk: iproc: add initial common clock support

[Tim Kryger]

On Thu, Dec 4, 2014 at 1:43 PM, Ray Jui <rjui@broadcom.com> wrote:
> This adds basic and generic support for various iProc PLLs and clocks
> including the ARMPLL, GENPLL, LCPLL, MIPIPLL, and ASIU clocks.
>
> SoCs under the iProc architecture can define their specific register
> offsets and clock parameters for their PLL and clock controllers. These
> parameters can be passed as arugments into the generic iProc PLL and
> clock setup functions
>
> Derived from code originally provided by Jonathan Richardson
> <jonathar@broadcom.com>
>
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> ---
>  drivers/clk/Makefile               |    2 +-
>  drivers/clk/bcm/Kconfig            |    9 +
>  drivers/clk/bcm/Makefile           |    1 +
>  drivers/clk/bcm/clk-iproc-armpll.c |  286 +++++++++++++++++++++
>  drivers/clk/bcm/clk-iproc-asiu.c   |  275 ++++++++++++++++++++
>  drivers/clk/bcm/clk-iproc-clk.c    |  238 ++++++++++++++++++
>  drivers/clk/bcm/clk-iproc-pll.c    |  483 ++++++++++++++++++++++++++++++++++++
>  drivers/clk/bcm/clk-iproc.h        |  155 ++++++++++++
>  8 files changed, 1448 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
>  create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
>  create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
>  create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
>  create mode 100644 drivers/clk/bcm/clk-iproc.h
>
> diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
> index d5fba5b..eff0213 100644
> --- a/drivers/clk/Makefile
> +++ b/drivers/clk/Makefile
> @@ -41,7 +41,7 @@ obj-$(CONFIG_ARCH_VT8500)             += clk-vt8500.o
>  obj-$(CONFIG_COMMON_CLK_WM831X)                += clk-wm831x.o
>  obj-$(CONFIG_COMMON_CLK_XGENE)         += clk-xgene.o
>  obj-$(CONFIG_COMMON_CLK_AT91)          += at91/
> -obj-$(CONFIG_ARCH_BCM_MOBILE)          += bcm/
> +obj-$(CONFIG_ARCH_BCM)                 += bcm/
>  obj-$(CONFIG_ARCH_BERLIN)              += berlin/
>  obj-$(CONFIG_ARCH_HI3xxx)              += hisilicon/
>  obj-$(CONFIG_ARCH_HIP04)               += hisilicon/

It may be best to move the above change into its own commit.

> diff --git a/drivers/clk/bcm/Kconfig b/drivers/clk/bcm/Kconfig
> index 75506e5..66b5b7f 100644
> --- a/drivers/clk/bcm/Kconfig
> +++ b/drivers/clk/bcm/Kconfig
> @@ -7,3 +7,12 @@ config CLK_BCM_KONA
>           Enable common clock framework support for Broadcom SoCs
>           using "Kona" style clock control units, including those
>           in the BCM281xx and BCM21664 families.
> +
> +config COMMON_CLK_IPROC
> +       bool "Broadcom iProc clock support"
> +       depends on ARCH_BCM_IPROC
> +       depends on COMMON_CLK
> +       default y
> +       help
> +         Enable common clock framework support for Broadcom SoCs
> +         based on the "iProc" architecture
> diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
> index 6297d05..6926636 100644
> --- a/drivers/clk/bcm/Makefile
> +++ b/drivers/clk/bcm/Makefile
> @@ -2,3 +2,4 @@ obj-$(CONFIG_CLK_BCM_KONA)      += clk-kona.o
>  obj-$(CONFIG_CLK_BCM_KONA)     += clk-kona-setup.o
>  obj-$(CONFIG_CLK_BCM_KONA)     += clk-bcm281xx.o
>  obj-$(CONFIG_CLK_BCM_KONA)     += clk-bcm21664.o
> +obj-$(CONFIG_COMMON_CLK_IPROC) += clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
> diff --git a/drivers/clk/bcm/clk-iproc-armpll.c b/drivers/clk/bcm/clk-iproc-armpll.c
> new file mode 100644
> index 0000000..ec9b130
> --- /dev/null
> +++ b/drivers/clk/bcm/clk-iproc-armpll.c
> @@ -0,0 +1,286 @@
> +/*
> + * Copyright (C) 2014 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/slab.h>
> +#include <linux/err.h>
> +#include <linux/clk-provider.h>
> +#include <linux/io.h>
> +#include <linux/of.h>
> +#include <linux/clkdev.h>
> +#include <linux/of_address.h>
> +
> +#define IPROC_CLK_MAX_FREQ_POLICY                    0x3
> +#define IPROC_CLK_POLICY_FREQ_OFFSET                 0x008
> +#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT      8
> +#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK       0x7
> +
> +#define IPROC_CLK_PLLARMA_OFFSET                     0xc00
> +#define IPROC_CLK_PLLARMA_LOCK_SHIFT                 28
> +#define IPROC_CLK_PLLARMA_PDIV_SHIFT                 24
> +#define IPROC_CLK_PLLARMA_PDIV_MASK                  0xf
> +#define IPROC_CLK_PLLARMA_NDIV_INT_SHIFT             8
> +#define IPROC_CLK_PLLARMA_NDIV_INT_MASK              0x3ff
> +
> +#define IPROC_CLK_PLLARMB_OFFSET                     0xc04
> +#define IPROC_CLK_PLLARMB_NDIV_FRAC_MASK             0xfffff
> +
> +#define IPROC_CLK_PLLARMC_OFFSET                     0xc08
> +#define IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT            8
> +#define IPROC_CLK_PLLARMC_MDIV_MASK                  0xff
> +
> +#define IPROC_CLK_PLLARMCTL5_OFFSET                  0xc20
> +#define IPROC_CLK_PLLARMCTL5_H_MDIV_MASK             0xff
> +
> +#define IPROC_CLK_PLLARM_OFFSET_OFFSET               0xc24
> +#define IPROC_CLK_PLLARM_SW_CTL_SHIFT                29
> +#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT       20
> +#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK        0xff
> +#define IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK       0xfffff
> +
> +#define IPROC_CLK_ARM_DIV_OFFSET                     0xe00
> +#define IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT  4
> +#define IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK        0xf
> +
> +#define IPROC_CLK_POLICY_DBG_OFFSET                  0xec0
> +#define IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT          12
> +#define IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK           0x7
> +
> +enum iproc_arm_pll_fid {
> +       ARM_PLL_FID_CRYSTAL_CLK   = 0,
> +       ARM_PLL_FID_SYS_CLK       = 2,
> +       ARM_PLL_FID_CH0_SLOW_CLK  = 6,
> +       ARM_PLL_FID_CH1_FAST_CLK  = 7
> +};
> +
> +struct iproc_arm_pll {
> +       struct clk_hw hw;
> +       void __iomem *base;
> +       struct clk_onecell_data clk_data;
> +       unsigned long rate;
> +};
> +
> +#define to_iproc_arm_pll(hw) container_of(hw, struct iproc_arm_pll, hw)
> +
> +static unsigned int __get_fid(struct iproc_arm_pll *pll)
> +{
> +       u32 val;
> +       unsigned int policy, fid, active_fid;
> +
> +       val = readl(pll->base + IPROC_CLK_ARM_DIV_OFFSET);
> +       if (val & (1 << IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT))
> +               policy = val & IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK;
> +       else
> +               policy = 0;
> +
> +       /* something is seriously wrong */
> +       BUG_ON(policy > IPROC_CLK_MAX_FREQ_POLICY);
> +
> +       val = readl(pll->base + IPROC_CLK_POLICY_FREQ_OFFSET);
> +       fid = (val >> (IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT * policy)) &
> +               IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK;
> +
> +       val = readl(pll->base + IPROC_CLK_POLICY_DBG_OFFSET);
> +       active_fid = IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK &
> +               (val >> IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT);
> +       if (fid != active_fid) {
> +               pr_debug("%s: fid override %u->%u\n", __func__, fid,
> +                               active_fid);
> +               fid = active_fid;
> +       }
> +
> +       pr_debug("%s: active fid: %u\n", __func__, fid);
> +
> +       return fid;
> +}
> +
> +/*
> + * Determine the mdiv (post divider) based on the frequency ID being used.
> + * There are 4 sources that can be used to derive the output clock rate:
> + *    - 25 MHz Crystal
> + *    - System clock
> + *    - PLL channel 0 (slow clock)
> + *    - PLL channel 1 (fast clock)
> + */
> +static int __get_mdiv(struct iproc_arm_pll *pll)
> +{
> +       unsigned int fid;
> +       int mdiv;
> +       u32 val;
> +
> +       fid = __get_fid(pll);
> +
> +       switch (fid) {
> +       case ARM_PLL_FID_CRYSTAL_CLK:
> +       case ARM_PLL_FID_SYS_CLK:
> +               mdiv = 1;
> +               break;
> +
> +       case ARM_PLL_FID_CH0_SLOW_CLK:
> +               val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
> +               mdiv = val & IPROC_CLK_PLLARMC_MDIV_MASK;
> +               if (mdiv == 0)
> +                       mdiv = 256;
> +               break;
> +
> +       case ARM_PLL_FID_CH1_FAST_CLK:
> +               val = readl(pll->base + IPROC_CLK_PLLARMCTL5_OFFSET);
> +               mdiv = val & IPROC_CLK_PLLARMCTL5_H_MDIV_MASK;
> +               if (mdiv == 0)
> +                       mdiv = 256;
> +               break;
> +
> +       default:
> +               mdiv = -EFAULT;
> +       }
> +
> +       return mdiv;
> +}
> +
> +static unsigned int __get_ndiv(struct iproc_arm_pll *pll)
> +{
> +       u32 val;
> +       unsigned int ndiv_int, ndiv_frac, ndiv;
> +
> +       val = readl(pll->base + IPROC_CLK_PLLARM_OFFSET_OFFSET);
> +       if (val & (1 << IPROC_CLK_PLLARM_SW_CTL_SHIFT)) {
> +               /*
> +                * offset mode is active. Read the ndiv from the PLLARM OFFSET
> +                * register
> +                */
> +               ndiv_int = (val >> IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT) &
> +                       IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK;
> +               if (ndiv_int == 0)
> +                       ndiv_int = 256;
> +
> +               ndiv_frac = val & IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK;
> +       } else {
> +               /* offset mode not active */
> +               val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
> +               ndiv_int = (val >> IPROC_CLK_PLLARMA_NDIV_INT_SHIFT) &
> +                       IPROC_CLK_PLLARMA_NDIV_INT_MASK;
> +               if (ndiv_int == 0)
> +                       ndiv_int = 1024;
> +
> +               val = readl(pll->base + IPROC_CLK_PLLARMB_OFFSET);
> +               ndiv_frac = val & IPROC_CLK_PLLARMB_NDIV_FRAC_MASK;
> +       }
> +
> +       ndiv = (ndiv_int << 20) | ndiv_frac;
> +
> +       return ndiv;
> +}
> +
> +/*
> + * The output frequency of the ARM PLL is calculated based on the ARM PLL
> + * divider values:
> + *   pdiv = ARM PLL pre-divider
> + *   ndiv = ARM PLL multiplier
> + *   mdiv = ARM PLL post divider
> + *
> + * The frequency is calculated by:
> + *   ((ndiv * parent clock rate) / pdiv) / mdiv
> + */
> +static unsigned long iproc_arm_pll_recalc_rate(struct clk_hw *hw,
> +               unsigned long parent_rate)
> +{
> +       struct iproc_arm_pll *pll = to_iproc_arm_pll(hw);
> +       u32 val;
> +       int mdiv;
> +       u64 ndiv;
> +       unsigned int pdiv;
> +
> +       /* in bypass mode, use parent rate */
> +       val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
> +       if (val & (1 << IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT)) {
> +               pll->rate = parent_rate;
> +               return pll->rate;
> +       }
> +
> +       /* PLL needs to be locked */
> +       val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
> +       if (!(val & (1 << IPROC_CLK_PLLARMA_LOCK_SHIFT))) {
> +               pll->rate = 0;
> +               return 0;
> +       }
> +
> +       pdiv = (val >> IPROC_CLK_PLLARMA_PDIV_SHIFT) &
> +               IPROC_CLK_PLLARMA_PDIV_MASK;
> +       if (pdiv == 0)
> +               pdiv = 16;
> +
> +       ndiv = __get_ndiv(pll);
> +       mdiv = __get_mdiv(pll);
> +       if (mdiv <= 0) {
> +               pll->rate = 0;
> +               return 0;
> +       }
> +       pll->rate = (ndiv * parent_rate) >> 20;
> +       pll->rate = (pll->rate / pdiv) / mdiv;
> +
> +       pr_debug("%s: ARM PLL rate: %lu. parent rate: %lu\n", __func__,
> +                       pll->rate, parent_rate);
> +       pr_debug("%s: ndiv_int: %u, pdiv: %u, mdiv: %d\n", __func__,
> +                       (unsigned int)(ndiv >> 20), pdiv, mdiv);
> +
> +       return pll->rate;
> +}
> +
> +static const struct clk_ops iproc_arm_pll_ops = {
> +       .recalc_rate = iproc_arm_pll_recalc_rate,
> +};
> +
> +void __init iproc_armpll_setup(struct device_node *node)
> +{
> +       int ret;
> +       struct clk *clk;
> +       struct iproc_arm_pll *pll;
> +       struct clk_init_data init;
> +       const char *parent_name;
> +
> +       pll = kzalloc(sizeof(*pll), GFP_KERNEL);
> +       if (WARN_ON(!pll))
> +               return;
> +
> +       pll->base = of_iomap(node, 0);
> +       if (WARN_ON(!pll->base))
> +               goto err_free_pll;
> +
> +       init.name = node->name;
> +       init.ops = &iproc_arm_pll_ops;
> +       init.flags = 0;
> +       parent_name = of_clk_get_parent_name(node, 0);
> +       init.parent_names = (parent_name ? &parent_name : NULL);
> +       init.num_parents = (parent_name ? 1 : 0);
> +       pll->hw.init = &init;
> +
> +       clk = clk_register(NULL, &pll->hw);
> +       if (WARN_ON(IS_ERR(clk)))
> +               goto err_iounmap;
> +
> +       pll->clk_data.clk_num = 1;
> +       pll->clk_data.clks = &clk;
> +
> +       ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
> +       if (WARN_ON(ret))
> +               goto err_clk_unregister;
> +
> +       return;
> +
> +err_clk_unregister:
> +       clk_unregister(clk);
> +err_iounmap:
> +       iounmap(pll->base);
> +err_free_pll:
> +       kfree(pll);
> +}
> diff --git a/drivers/clk/bcm/clk-iproc-asiu.c b/drivers/clk/bcm/clk-iproc-asiu.c
> new file mode 100644
> index 0000000..ab86b8c
> --- /dev/null
> +++ b/drivers/clk/bcm/clk-iproc-asiu.c
> @@ -0,0 +1,275 @@
> +/*
> + * Copyright (C) 2014 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/err.h>
> +#include <linux/clk-provider.h>
> +#include <linux/io.h>
> +#include <linux/of.h>
> +#include <linux/clkdev.h>
> +#include <linux/of_address.h>
> +#include <linux/delay.h>
> +
> +#include "clk-iproc.h"
> +
> +struct iproc_asiu;
> +
> +struct iproc_asiu_clk {
> +       struct clk_hw hw;
> +       const char *name;
> +       struct iproc_asiu *asiu;
> +       unsigned long rate;
> +       struct iproc_asiu_div div;
> +       struct iproc_asiu_gate gate;
> +};
> +
> +struct iproc_asiu {
> +       void __iomem *div_base;
> +       void __iomem *gate_base;
> +
> +       struct clk_onecell_data clk_data;
> +       struct iproc_asiu_clk *clks;
> +};
> +
> +#define to_asiu_clk(hw) container_of(hw, struct iproc_asiu_clk, hw)
> +
> +static int iproc_asiu_clk_enable(struct clk_hw *hw)
> +{
> +       struct iproc_asiu_clk *clk = to_asiu_clk(hw);
> +       struct iproc_asiu *asiu = clk->asiu;
> +       u32 val;
> +
> +       /* some clocks at the ASIU level are always enabled */
> +       if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
> +               return 0;
> +
> +       val = readl(asiu->gate_base + clk->gate.offset);
> +       val |= (1 << clk->gate.en_shift);
> +       writel(val, asiu->gate_base + clk->gate.offset);
> +
> +       return 0;
> +}
> +
> +static void iproc_asiu_clk_disable(struct clk_hw *hw)
> +{
> +       struct iproc_asiu_clk *clk = to_asiu_clk(hw);
> +       struct iproc_asiu *asiu = clk->asiu;
> +       u32 val;
> +
> +       /* some clocks at the ASIU level are always enabled */
> +       if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
> +               return;
> +
> +       val = readl(asiu->gate_base + clk->gate.offset);
> +       val &= ~(1 << clk->gate.en_shift);
> +       writel(val, asiu->gate_base + clk->gate.offset);
> +}
> +
> +static unsigned long iproc_asiu_clk_recalc_rate(struct clk_hw *hw,
> +               unsigned long parent_rate)
> +{
> +       struct iproc_asiu_clk *clk = to_asiu_clk(hw);
> +       struct iproc_asiu *asiu = clk->asiu;
> +       u32 val;
> +       unsigned int div_h, div_l;
> +
> +       if (parent_rate == 0) {
> +               clk->rate = 0;
> +               return 0;
> +       }
> +
> +       /* if clock divisor is not enabled, simply return parent rate */
> +       val = readl(asiu->div_base + clk->div.offset);
> +       if ((val & (1 << clk->div.en_shift)) == 0) {
> +               clk->rate = parent_rate;
> +               return parent_rate;
> +       }
> +
> +       /* clock rate = parent rate / (high_div + 1) + (low_div + 1) */
> +       div_h = (val >> clk->div.high_shift) & bit_mask(clk->div.high_width);
> +       div_h++;
> +       div_l = (val >> clk->div.low_shift) & bit_mask(clk->div.low_width);
> +       div_l++;
> +
> +       clk->rate = parent_rate / (div_h + div_l);
> +       pr_debug("%s: rate: %lu. parent rate: %lu div_h: %u div_l: %u\n",
> +               __func__, clk->rate, parent_rate, div_h, div_l);
> +
> +       return clk->rate;
> +}
> +
> +static long iproc_asiu_clk_round_rate(struct clk_hw *hw, unsigned long rate,
> +               unsigned long *parent_rate)
> +{
> +       unsigned int div;
> +
> +       if (rate == 0 || *parent_rate == 0)
> +               return -EINVAL;
> +
> +       if (rate == *parent_rate)
> +               return *parent_rate;
> +
> +       div = DIV_ROUND_UP(*parent_rate, rate);
> +       if (div < 2)
> +               return *parent_rate;
> +
> +       return *parent_rate / div;
> +}
> +
> +static int iproc_asiu_clk_set_rate(struct clk_hw *hw, unsigned long rate,
> +               unsigned long parent_rate)
> +{
> +       struct iproc_asiu_clk *clk = to_asiu_clk(hw);
> +       struct iproc_asiu *asiu = clk->asiu;
> +       unsigned int div, div_h, div_l;
> +       u32 val;
> +
> +       if (rate == 0 || parent_rate == 0)
> +               return -EINVAL;
> +
> +       /* simply disable the divisor if one wants the same rate as parent */
> +       if (rate == parent_rate) {
> +               val = readl(asiu->div_base + clk->div.offset);
> +               val &= ~(1 << clk->div.en_shift);
> +               writel(val, asiu->div_base + clk->div.offset);
> +               return 0;
> +       }
> +
> +       div = DIV_ROUND_UP(parent_rate, rate);
> +       if (div < 2)
> +               return -EINVAL;
> +
> +       div_h = div_l = div >> 1;
> +       div_h--;
> +       div_l--;
> +
> +       val = readl(asiu->div_base + clk->div.offset);
> +       val |= 1 << clk->div.en_shift;
> +       if (div_h) {
> +               val &= ~(bit_mask(clk->div.high_width)
> +                               << clk->div.high_shift);
> +               val |= div_h << clk->div.high_shift;
> +       } else {
> +               val &= ~(bit_mask(clk->div.high_width)
> +                               << clk->div.high_shift);
> +       }
> +       if (div_l) {
> +               val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
> +               val |= div_l << clk->div.low_shift;
> +       } else {
> +               val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
> +       }
> +       writel(val, asiu->div_base + clk->div.offset);
> +
> +       return 0;
> +}
> +
> +static const struct clk_ops iproc_asiu_ops = {
> +       .enable = iproc_asiu_clk_enable,
> +       .disable = iproc_asiu_clk_disable,
> +       .recalc_rate = iproc_asiu_clk_recalc_rate,
> +       .round_rate = iproc_asiu_clk_round_rate,
> +       .set_rate = iproc_asiu_clk_set_rate,
> +};
> +
> +void __init iproc_asiu_setup(struct device_node *node,
> +               const struct iproc_asiu_div *div,
> +               const struct iproc_asiu_gate *gate, unsigned int num_clks)
> +{
> +       int i, ret;
> +       struct iproc_asiu *asiu;
> +
> +       if (WARN_ON(!gate || !div))
> +               return;
> +
> +       asiu = kzalloc(sizeof(*asiu), GFP_KERNEL);
> +       if (WARN_ON(!asiu))
> +               return;
> +
> +       asiu->clk_data.clk_num = num_clks;
> +       asiu->clk_data.clks = kcalloc(num_clks, sizeof(*asiu->clk_data.clks),
> +                       GFP_KERNEL);
> +       if (WARN_ON(!asiu->clk_data.clks))
> +               goto err_clks;
> +
> +       asiu->clks = kcalloc(num_clks, sizeof(*asiu->clks), GFP_KERNEL);
> +       if (WARN_ON(!asiu->clks))
> +               goto err_asiu_clks;
> +
> +       asiu->div_base = of_iomap(node, 0);
> +       if (WARN_ON(!asiu->div_base))
> +               goto err_iomap_div;
> +
> +       asiu->gate_base = of_iomap(node, 1);
> +       if (WARN_ON(!asiu->gate_base))
> +               goto err_iomap_gate;
> +
> +       for (i = 0; i < num_clks; i++) {
> +               struct clk_init_data init;
> +               struct clk *clk;
> +               const char *parent_name;
> +               struct iproc_asiu_clk *asiu_clk;
> +               const char *clk_name;
> +
> +               clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
> +               if (WARN_ON(!clk_name))
> +                       goto err_clk_register;
> +
> +               ret = of_property_read_string_index(node, "clock-output-names",
> +                               i, &clk_name);
> +               if (WARN_ON(ret))
> +                       goto err_clk_register;
> +
> +               asiu_clk = &asiu->clks[i];
> +               asiu_clk->name = clk_name;
> +               asiu_clk->asiu = asiu;
> +               asiu_clk->div = div[i];
> +               asiu_clk->gate = gate[i];
> +               init.name = clk_name;
> +               init.ops = &iproc_asiu_ops;
> +               init.flags = 0;
> +               parent_name = of_clk_get_parent_name(node, 0);
> +               init.parent_names = (parent_name ? &parent_name : NULL);
> +               init.num_parents = (parent_name ? 1 : 0);
> +               asiu_clk->hw.init = &init;
> +
> +               clk = clk_register(NULL, &asiu_clk->hw);
> +               if (WARN_ON(IS_ERR(clk)))
> +                       goto err_clk_register;
> +               asiu->clk_data.clks[i] = clk;
> +       }
> +
> +       ret = of_clk_add_provider(node, of_clk_src_onecell_get,
> +                       &asiu->clk_data);
> +       if (WARN_ON(ret))
> +               goto err_clk_register;
> +
> +       return;
> +
> +err_clk_register:
> +       for (i = 0; i < num_clks; i++)
> +               kfree(asiu->clks[i].name);
> +       iounmap(asiu->gate_base);
> +
> +err_iomap_gate:
> +       iounmap(asiu->div_base);
> +
> +err_iomap_div:
> +       kfree(asiu->clks);
> +
> +err_asiu_clks:
> +       kfree(asiu->clk_data.clks);
> +
> +err_clks:
> +       kfree(asiu);
> +}
> diff --git a/drivers/clk/bcm/clk-iproc-clk.c b/drivers/clk/bcm/clk-iproc-clk.c
> new file mode 100644
> index 0000000..be3c42c
> --- /dev/null
> +++ b/drivers/clk/bcm/clk-iproc-clk.c
> @@ -0,0 +1,238 @@
> +/*
> + * Copyright (C) 2014 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/err.h>
> +#include <linux/clk-provider.h>
> +#include <linux/io.h>
> +#include <linux/of.h>
> +#include <linux/clkdev.h>
> +#include <linux/of_address.h>
> +#include <linux/delay.h>
> +
> +#include "clk-iproc.h"
> +
> +struct iproc_pll;
> +
> +struct iproc_clk {
> +       struct clk_hw hw;
> +       const char *name;
> +       struct iproc_pll *pll;
> +       unsigned long rate;
> +       const struct iproc_clk_ctrl *ctrl;
> +};
> +
> +struct iproc_pll {
> +       void __iomem *base;
> +       struct clk_onecell_data clk_data;
> +       struct iproc_clk *clks;
> +};
> +
> +#define to_iproc_clk(hw) container_of(hw, struct iproc_clk, hw)
> +
> +static int iproc_clk_enable(struct clk_hw *hw)
> +{
> +       struct iproc_clk *clk = to_iproc_clk(hw);
> +       const struct iproc_clk_ctrl *ctrl = clk->ctrl;
> +       struct iproc_pll *pll = clk->pll;
> +       u32 val;
> +
> +       /* channel enable is active low */
> +       val = readl(pll->base + ctrl->enable.offset);
> +       val &= ~(1 << ctrl->enable.enable_shift);
> +       writel(val, pll->base + ctrl->enable.offset);
> +
> +       /* also make sure channel is not held */
> +       val = readl(pll->base + ctrl->enable.offset);
> +       val &= ~(1 << ctrl->enable.hold_shift);
> +       writel(val, pll->base + ctrl->enable.offset);
> +
> +       return 0;
> +}
> +
> +static void iproc_clk_disable(struct clk_hw *hw)
> +{
> +       struct iproc_clk *clk = to_iproc_clk(hw);
> +       const struct iproc_clk_ctrl *ctrl = clk->ctrl;
> +       struct iproc_pll *pll = clk->pll;
> +       u32 val;
> +
> +       if (ctrl->flags & IPROC_CLK_AON)
> +               return;
> +
> +       val = readl(pll->base + ctrl->enable.offset);
> +       val |= 1 << ctrl->enable.enable_shift;
> +       writel(val, pll->base + ctrl->enable.offset);
> +}
> +
> +static unsigned long iproc_clk_recalc_rate(struct clk_hw *hw,
> +               unsigned long parent_rate)
> +{
> +       struct iproc_clk *clk = to_iproc_clk(hw);
> +       const struct iproc_clk_ctrl *ctrl = clk->ctrl;
> +       struct iproc_pll *pll = clk->pll;
> +       u32 val;
> +       unsigned int mdiv;
> +
> +       if (parent_rate == 0)
> +               return 0;
> +
> +       val = readl(pll->base + ctrl->mdiv.offset);
> +       mdiv = (val >> ctrl->mdiv.shift) & bit_mask(ctrl->mdiv.width);
> +       if (mdiv == 0)
> +               mdiv = 256;
> +
> +       clk->rate = parent_rate / mdiv;
> +
> +       return clk->rate;
> +}
> +
> +static long iproc_clk_round_rate(struct clk_hw *hw, unsigned long rate,
> +               unsigned long *parent_rate)
> +{
> +       unsigned int div;
> +
> +       if (rate == 0 || *parent_rate == 0)
> +               return -EINVAL;
> +
> +       if (rate == *parent_rate)
> +               return *parent_rate;
> +
> +       div = DIV_ROUND_UP(*parent_rate, rate);
> +       if (div < 2)
> +               return *parent_rate;
> +
> +       if (div > 256)
> +               div = 256;
> +
> +       return *parent_rate / div;
> +}
> +
> +static int iproc_clk_set_rate(struct clk_hw *hw, unsigned long rate,
> +               unsigned long parent_rate)
> +{
> +       struct iproc_clk *clk = to_iproc_clk(hw);
> +       const struct iproc_clk_ctrl *ctrl = clk->ctrl;
> +       struct iproc_pll *pll = clk->pll;
> +       u32 val;
> +       unsigned int div;
> +
> +       if (rate == 0 || parent_rate == 0)
> +               return -EINVAL;
> +
> +       div = DIV_ROUND_UP(parent_rate, rate);
> +       if (div > 256)
> +               return -EINVAL;
> +
> +       val = readl(pll->base + ctrl->mdiv.offset);
> +       if (div == 256) {
> +               val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
> +       } else {
> +               val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
> +               val |= div << ctrl->mdiv.shift;
> +       }
> +       writel(val, pll->base + ctrl->mdiv.offset);
> +       clk->rate = parent_rate / div;
> +
> +       return 0;
> +}
> +
> +static const struct clk_ops iproc_clk_ops = {
> +       .enable = iproc_clk_enable,
> +       .disable = iproc_clk_disable,
> +       .recalc_rate = iproc_clk_recalc_rate,
> +       .round_rate = iproc_clk_round_rate,
> +       .set_rate = iproc_clk_set_rate,
> +};
> +
> +void __init iproc_clk_setup(struct device_node *node,
> +               const struct iproc_clk_ctrl *ctrl, unsigned int num_clks)
> +{
> +       int i, ret;
> +       struct iproc_pll *pll;
> +
> +       if (WARN_ON(!ctrl))
> +               return;
> +
> +       pll = kzalloc(sizeof(*pll), GFP_KERNEL);
> +       if (WARN_ON(!pll))
> +               return;
> +
> +       pll->clk_data.clk_num = num_clks;
> +       pll->clk_data.clks = kcalloc(num_clks, sizeof(*pll->clk_data.clks),
> +                       GFP_KERNEL);
> +       if (WARN_ON(!pll->clk_data.clks))
> +               goto err_clks;
> +
> +       pll->clks = kcalloc(num_clks, sizeof(*pll->clks), GFP_KERNEL);
> +       if (WARN_ON(!pll->clks))
> +               goto err_pll_clks;
> +
> +       pll->base = of_iomap(node, 0);
> +       if (WARN_ON(!pll->base))
> +               goto err_iomap;
> +
> +       for (i = 0; i < num_clks; i++) {
> +               struct clk_init_data init;
> +               struct clk *clk;
> +               const char *parent_name;
> +               struct iproc_clk *iclk;
> +               const char *clk_name;
> +
> +               clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
> +               if (WARN_ON(!clk_name))
> +                       goto err_clk_register;
> +
> +               ret = of_property_read_string_index(node, "clock-output-names",
> +                               i, &clk_name);
> +               if (WARN_ON(ret))
> +                       goto err_clk_register;
> +
> +               iclk = &pll->clks[i];
> +               iclk->name = clk_name;
> +               iclk->pll = pll;
> +               iclk->ctrl = &ctrl[i];
> +               init.name = clk_name;
> +               init.ops = &iproc_clk_ops;
> +               init.flags = 0;
> +               parent_name = of_clk_get_parent_name(node, 0);
> +               init.parent_names = (parent_name ? &parent_name : NULL);
> +               init.num_parents = (parent_name ? 1 : 0);
> +               iclk->hw.init = &init;
> +
> +               clk = clk_register(NULL, &iclk->hw);
> +               if (WARN_ON(IS_ERR(clk)))
> +                       goto err_clk_register;
> +               pll->clk_data.clks[i] = clk;
> +       }
> +
> +       ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
> +       if (WARN_ON(ret))
> +               goto err_clk_register;
> +
> +       return;
> +
> +err_clk_register:
> +       for (i = 0; i < num_clks; i++)
> +               kfree(pll->clks[i].name);
> +       iounmap(pll->base);
> +
> +err_iomap:
> +       kfree(pll->clks);
> +
> +err_pll_clks:
> +       kfree(pll->clk_data.clks);
> +
> +err_clks:
> +       kfree(pll);
> +}
> diff --git a/drivers/clk/bcm/clk-iproc-pll.c b/drivers/clk/bcm/clk-iproc-pll.c
> new file mode 100644
> index 0000000..cd3bd38
> --- /dev/null
> +++ b/drivers/clk/bcm/clk-iproc-pll.c
> @@ -0,0 +1,483 @@
> +/*
> + * Copyright (C) 2014 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/err.h>
> +#include <linux/clk-provider.h>
> +#include <linux/io.h>
> +#include <linux/of.h>
> +#include <linux/clkdev.h>
> +#include <linux/of_address.h>
> +#include <linux/delay.h>
> +
> +#include "clk-iproc.h"
> +
> +#define PLL_VCO_HIGH_SHIFT 19
> +#define PLL_VCO_LOW_SHIFT  30
> +
> +/* number of delay loops waiting for PLL to lock */
> +#define LOCK_DELAY 100
> +
> +/* number of VCO frequency bands */
> +#define NUM_FREQ_BANDS 8
> +
> +#define NUM_KP_BANDS 3
> +enum kp_band {
> +       KP_BAND_MID = 0,
> +       KP_BAND_HIGH,
> +       KP_BAND_HIGH_HIGH
> +};
> +
> +static const unsigned int kp_table[NUM_KP_BANDS][NUM_FREQ_BANDS] = {
> +       { 5, 6, 6, 7, 7, 8, 9, 10 },
> +       { 4, 4, 5, 5, 6, 7, 8, 9  },
> +       { 4, 5, 5, 6, 7, 8, 9, 10 },
> +};
> +
> +static const unsigned long ref_freq_table[NUM_FREQ_BANDS][2] = {
> +       { 10000000,  12500000  },
> +       { 12500000,  15000000  },
> +       { 15000000,  20000000  },
> +       { 20000000,  25000000  },
> +       { 25000000,  50000000  },
> +       { 50000000,  75000000  },
> +       { 75000000,  100000000 },
> +       { 100000000, 125000000 },
> +};
> +
> +enum vco_freq_range {
> +       VCO_LOW       = 700000000U,
> +       VCO_MID       = 1200000000U,
> +       VCO_HIGH      = 2200000000U,
> +       VCO_HIGH_HIGH = 3100000000U,
> +       VCO_MAX       = 4000000000U,
> +};
> +
> +struct iproc_pll {
> +       struct clk_hw hw;
> +       void __iomem *pll_base;
> +       void __iomem *pwr_base;
> +       void __iomem *asiu_base;
> +       struct clk_onecell_data clk_data;
> +       const char *name;
> +       const struct iproc_pll_ctrl *ctrl;
> +       const struct iproc_pll_vco_freq_param *vco_param;
> +       unsigned int num_vco_entries;
> +       unsigned long rate;
> +};
> +
> +#define to_iproc_pll(hw) container_of(hw, struct iproc_pll, hw)
> +
> +/*
> + * Get the clock rate based on name
> + */
> +static unsigned long __get_rate(const char *clk_name)
> +{
> +       struct clk *clk;
> +
> +       clk = __clk_lookup(clk_name);
> +       if (!clk) {
> +               pr_err("%s: unable to find clock by name: %s\n", __func__,
> +                               clk_name);
> +               return 0;
> +       }
> +
> +       return clk_get_rate(clk);
> +}
> +
> +/*
> + * Based on the target frequency, find a match from the VCO frequency parameter
> + * table and return its index
> + */
> +static int pll_get_rate_index(struct iproc_pll *pll, unsigned int target_rate)
> +{
> +       int i;
> +
> +       for (i = 0; i < pll->num_vco_entries; i++)
> +               if (target_rate == pll->vco_param[i].rate)
> +                       break;
> +
> +       if (i >= pll->num_vco_entries)
> +               return -EINVAL;
> +
> +       return i;
> +}
> +
> +static int get_kp(unsigned long ref_freq, enum kp_band kp_index)
> +{
> +       int i;
> +
> +       if (ref_freq < ref_freq_table[0][0])
> +               return -EINVAL;
> +
> +       for (i = 0; i < NUM_FREQ_BANDS; i++) {
> +               if (ref_freq >= ref_freq_table[i][0] &&
> +                       ref_freq < ref_freq_table[i][1])
> +                       return kp_table[kp_index][i];
> +       }
> +       return -EINVAL;
> +}
> +
> +static int pll_wait_for_lock(struct iproc_pll *pll)
> +{
> +       int i;
> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
> +
> +       for (i = 0; i < LOCK_DELAY; i++) {
> +               u32 val = readl(pll->pll_base + ctrl->status.offset);
> +
> +               if (val & (1 << ctrl->status.shift))
> +                       return 0;
> +               udelay(10);
> +       }
> +
> +       return -EIO;
> +}
> +
> +static void __pll_disable(struct iproc_pll *pll)
> +{
> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
> +       u32 val;
> +
> +       if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
> +               val = readl(pll->asiu_base + ctrl->asiu.offset);
> +               val &= ~(1 << ctrl->asiu.en_shift);
> +               writel(val, pll->asiu_base + ctrl->asiu.offset);
> +       }
> +
> +       /* latch input value so core power can be shut down */
> +       val = readl(pll->pwr_base + ctrl->aon.offset);
> +       val |= (1 << ctrl->aon.iso_shift);
> +       writel(val, pll->pwr_base + ctrl->aon.offset);
> +
> +       /* power down the core */
> +       val &= ~(bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift);
> +       writel(val, pll->pwr_base + ctrl->aon.offset);
> +}
> +
> +static int __pll_enable(struct iproc_pll *pll)
> +{
> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
> +       u32 val;
> +
> +       /* power up the PLL and make sure it's not latched */
> +       val = readl(pll->pwr_base + ctrl->aon.offset);
> +       val |= bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift;
> +       val &= ~(1 << ctrl->aon.iso_shift);
> +       writel(val, pll->pwr_base + ctrl->aon.offset);
> +
> +       /* certain PLLs also need to be ungated from the ASIU top level */
> +       if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
> +               val = readl(pll->asiu_base + ctrl->asiu.offset);
> +               val |= (1 << ctrl->asiu.en_shift);
> +               writel(val, pll->asiu_base + ctrl->asiu.offset);
> +       }
> +
> +       return 0;
> +}
> +
> +static void __pll_put_in_reset(struct iproc_pll *pll)
> +{
> +       u32 val;
> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
> +       const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
> +
> +       val = readl(pll->pll_base + reset->offset);
> +       val &= ~(1 << reset->reset_shift | 1 << reset->p_reset_shift);
> +       writel(val, pll->pll_base + reset->offset);
> +}
> +
> +static void __pll_bring_out_reset(struct iproc_pll *pll, unsigned int kp,
> +               unsigned int ka, unsigned int ki)
> +{
> +       u32 val;
> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
> +       const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
> +
> +       val = readl(pll->pll_base + reset->offset);
> +       val &= ~(bit_mask(reset->ki_width) << reset->ki_shift |
> +               bit_mask(reset->kp_width) << reset->kp_shift |
> +               bit_mask(reset->ka_width) << reset->ka_shift);
> +       val |=  ki << reset->ki_shift | kp << reset->kp_shift |
> +               ka << reset->ka_shift;
> +       val |= 1 << reset->reset_shift | 1 << reset->p_reset_shift;
> +       writel(val, pll->pll_base + reset->offset);
> +}
> +
> +static int pll_set_rate(struct iproc_pll *pll, unsigned int rate_index,
> +               unsigned long parent_rate)
> +{
> +       const struct iproc_pll_vco_freq_param *vco =
> +                               &pll->vco_param[rate_index];
> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
> +       int ka = 0, ki, kp, ret;
> +       unsigned long rate = vco->rate;
> +       u32 val;
> +       enum kp_band kp_index;
> +       unsigned long ref_freq;
> +
> +       /*
> +        * reference frequency = parent frequency / PDIV
> +        * If PDIV = 0, then it becomes a multiplier (x2)
> +        */
> +       if (vco->pdiv == 0)
> +               ref_freq = parent_rate * 2;
> +       else
> +               ref_freq = parent_rate / vco->pdiv;
> +
> +       /* determine Ki and Kp index based on target VCO frequency */
> +       if (rate >= VCO_LOW && rate < VCO_HIGH) {
> +               ki = 4;
> +               kp_index = KP_BAND_MID;
> +       } else if (rate >= VCO_HIGH && rate && rate < VCO_HIGH_HIGH) {
> +               ki = 3;
> +               kp_index = KP_BAND_HIGH;
> +       } else if (rate >= VCO_HIGH_HIGH && rate < VCO_MAX) {
> +               ki = 3;
> +               kp_index = KP_BAND_HIGH_HIGH;
> +       } else {
> +               pr_err("%s: pll: %s has invalid rate: %lu\n", __func__,
> +                               pll->name, rate);
> +               return -EINVAL;
> +       }
> +
> +       kp = get_kp(ref_freq, kp_index);
> +       if (kp < 0) {
> +               pr_err("%s: pll: %s has invalid kp\n", __func__, pll->name);
> +               return kp;
> +       }
> +
> +       ret = __pll_enable(pll);
> +       if (ret) {
> +               pr_err("%s: pll: %s fails to enable\n", __func__, pll->name);
> +               return ret;
> +       }
> +
> +       /* put PLL in reset */
> +       __pll_put_in_reset(pll);
> +
> +       writel(0, pll->pll_base + ctrl->vco_ctrl.u_offset);
> +       val = readl(pll->pll_base + ctrl->vco_ctrl.l_offset);
> +
> +       if (rate >= VCO_LOW && rate < VCO_MID)
> +               val |= (1 << PLL_VCO_LOW_SHIFT);
> +
> +       if (rate < VCO_HIGH)
> +               val &= ~(1 << PLL_VCO_HIGH_SHIFT);
> +       else
> +               val |= (1 << PLL_VCO_HIGH_SHIFT);
> +
> +       writel(val, pll->pll_base + ctrl->vco_ctrl.l_offset);
> +
> +       /* program integer part of NDIV */
> +       val = readl(pll->pll_base + ctrl->ndiv_int.offset);
> +       val &= ~(bit_mask(ctrl->ndiv_int.width) << ctrl->ndiv_int.shift);
> +       val |= vco->ndiv_int << ctrl->ndiv_int.shift;
> +       writel(val, pll->pll_base + ctrl->ndiv_int.offset);
> +
> +       /* program fractional part of NDIV */
> +       if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
> +               val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
> +               val &= ~(bit_mask(ctrl->ndiv_frac.width) <<
> +                               ctrl->ndiv_frac.shift);
> +               val |= vco->ndiv_frac << ctrl->ndiv_frac.shift;
> +               writel(val, pll->pll_base + ctrl->ndiv_frac.offset);
> +       }
> +
> +       /* program PDIV */
> +       val = readl(pll->pll_base + ctrl->pdiv.offset);
> +       val &= ~(bit_mask(ctrl->pdiv.width) << ctrl->pdiv.shift);
> +       val |= vco->pdiv << ctrl->pdiv.shift;
> +       writel(val, pll->pll_base + ctrl->pdiv.offset);
> +
> +       __pll_bring_out_reset(pll, kp, ka, ki);
> +
> +       ret = pll_wait_for_lock(pll);
> +       if (ret < 0) {
> +               pr_err("%s: pll: %s failed to lock\n", __func__, pll->name);
> +               return ret;
> +       }
> +
> +       return 0;
> +}
> +
> +static int iproc_pll_enable(struct clk_hw *hw)
> +{
> +       struct iproc_pll *pll = to_iproc_pll(hw);
> +
> +       return __pll_enable(pll);
> +}
> +
> +static void iproc_pll_disable(struct clk_hw *hw)
> +{
> +       struct iproc_pll *pll = to_iproc_pll(hw);
> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
> +
> +       if (ctrl->flags & IPROC_CLK_AON)
> +               return;
> +
> +       __pll_disable(pll);
> +}
> +
> +static unsigned long iproc_pll_recalc_rate(struct clk_hw *hw,
> +       unsigned long parent_rate)
> +{
> +       struct iproc_pll *pll = to_iproc_pll(hw);
> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
> +       u32 val;
> +       u64 ndiv;
> +       unsigned int ndiv_int, ndiv_frac, pdiv;
> +
> +       if (parent_rate == 0)
> +               return 0;
> +
> +       /* PLL needs to be locked */
> +       val = readl(pll->pll_base + ctrl->status.offset);
> +       if ((val & (1 << ctrl->status.shift)) == 0) {
> +               pll->rate = 0;
> +               return 0;
> +       }
> +
> +       /*
> +        * PLL output frequency =
> +        *
> +        * ((ndiv_int + ndiv_frac / 2^20) * (parent clock rate / pdiv)
> +        */
> +       val = readl(pll->pll_base + ctrl->ndiv_int.offset);
> +       ndiv_int = (val >> ctrl->ndiv_int.shift) &
> +               bit_mask(ctrl->ndiv_int.width);
> +       ndiv = ndiv_int << ctrl->ndiv_int.shift;
> +
> +       if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
> +               val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
> +               ndiv_frac = (val >> ctrl->ndiv_frac.shift) &
> +                       bit_mask(ctrl->ndiv_frac.width);
> +
> +               if (ndiv_frac != 0)
> +                       ndiv = (ndiv_int << ctrl->ndiv_int.shift) | ndiv_frac;
> +       }
> +
> +       val = readl(pll->pll_base + ctrl->pdiv.offset);
> +       pdiv = (val >> ctrl->pdiv.shift) & bit_mask(ctrl->pdiv.width);
> +
> +       pll->rate = (ndiv * parent_rate) >> ctrl->ndiv_int.shift;
> +
> +       if (pdiv == 0)
> +               pll->rate *= 2;
> +       else
> +               pll->rate /= pdiv;
> +
> +       return pll->rate;
> +}
> +
> +static const struct clk_ops iproc_pll_ops = {
> +       .enable = iproc_pll_enable,
> +       .disable = iproc_pll_disable,
> +       .recalc_rate = iproc_pll_recalc_rate,
> +};
> +
> +void __init iproc_pll_setup(struct device_node *node,
> +               const struct iproc_pll_ctrl *ctrl,
> +               const struct iproc_pll_vco_freq_param *vco_param,
> +               unsigned int num_vco_entries)
> +{
> +       int ret;
> +       struct clk *clk;
> +       struct iproc_pll *pll;
> +       struct clk_init_data init;
> +       const char *parent_name;
> +       unsigned int rate;
> +
> +       if (WARN_ON(!ctrl))
> +               return;
> +
> +       pll = kzalloc(sizeof(*pll), GFP_KERNEL);
> +       if (WARN_ON(!pll))
> +               return;
> +
> +       pll->pll_base = of_iomap(node, 0);
> +       if (WARN_ON(!pll->pll_base))
> +               goto err_pll_iomap;
> +
> +       pll->pwr_base = of_iomap(node, 1);
> +       if (WARN_ON(!pll->pwr_base))
> +               goto err_pwr_iomap;
> +
> +       /* some PLLs require gating control at the top ASIU level */
> +       if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
> +               pll->asiu_base = of_iomap(node, 2);
> +               if (WARN_ON(!pll->asiu_base))
> +                       goto err_asiu_iomap;
> +       }
> +
> +       pll->ctrl = ctrl;
> +       pll->name = node->name;
> +       init.name = node->name;
> +       init.ops = &iproc_pll_ops;
> +       init.flags = 0;
> +       parent_name = of_clk_get_parent_name(node, 0);
> +       init.parent_names = (parent_name ? &parent_name : NULL);
> +       init.num_parents = (parent_name ? 1 : 0);
> +       pll->hw.init = &init;
> +
> +       /* configure the PLL to the desired VCO frequency if specified */
> +       ret = of_property_read_u32(node, "clock-frequency", &rate);
> +       if (!ret) {
> +               unsigned long parent_rate;
> +               int rate_index;
> +
> +               if (WARN_ON(!vco_param))
> +                       goto err_clk_register;
> +
> +               pll->num_vco_entries = num_vco_entries;
> +               pll->vco_param = vco_param;
> +
> +               parent_rate = __get_rate(parent_name);
> +               if (WARN_ON(!parent_rate))
> +                       goto err_clk_register;
> +
> +               rate_index = pll_get_rate_index(pll, rate);
> +               if (WARN_ON(rate_index < 0))
> +                       goto err_clk_register;
> +
> +               ret = pll_set_rate(pll, rate_index, parent_rate);
> +               if (WARN_ON(ret))
> +                       goto err_clk_register;
> +       }
> +
> +       clk = clk_register(NULL, &pll->hw);
> +       if (WARN_ON(IS_ERR(clk)))
> +               goto err_clk_register;
> +
> +       pll->clk_data.clk_num = 1;
> +       pll->clk_data.clks = &clk;
> +
> +       ret = of_clk_add_provider(node, of_clk_src_onecell_get,
> +                       &pll->clk_data);
> +       if (WARN_ON(ret))
> +               goto err_clk_add;
> +
> +       return;
> +
> +err_clk_add:
> +       clk_unregister(clk);
> +err_clk_register:
> +       if (pll->asiu_base)
> +               iounmap(pll->asiu_base);
> +err_asiu_iomap:
> +       iounmap(pll->pwr_base);
> +err_pwr_iomap:
> +       iounmap(pll->pll_base);
> +err_pll_iomap:
> +       kfree(pll);
> +}
> diff --git a/drivers/clk/bcm/clk-iproc.h b/drivers/clk/bcm/clk-iproc.h
> new file mode 100644
> index 0000000..4aa0479
> --- /dev/null
> +++ b/drivers/clk/bcm/clk-iproc.h
> @@ -0,0 +1,155 @@
> +/*
> + * Copyright (C) 2014 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef _CLK_IPROC_H
> +#define _CLK_IPROC_H
> +
> +#include <linux/kernel.h>
> +#include <linux/list.h>
> +#include <linux/spinlock.h>
> +#include <linux/slab.h>
> +#include <linux/device.h>
> +#include <linux/of.h>
> +#include <linux/clk-provider.h>
> +
> +#define IPROC_CLK_NAME_LEN 25
> +#define IPROC_CLK_INVALID_OFFSET 0xffffffff
> +#define bit_mask(width) ((1 << (width)) - 1)
> +
> +/* clock should not be disabled at runtime */
> +#define IPROC_CLK_AON BIT(0)
> +
> +/* PLL requires gating through ASIU */
> +#define IPROC_CLK_PLL_ASIU BIT(1)
> +
> +/* PLL has fractional part of the NDIV */
> +#define IPROC_CLK_PLL_HAS_NDIV_FRAC BIT(2)
> +
> +/*
> + * Parameters for VCO frequency configuration
> + *
> + * VCO frequency =
> + * ((ndiv_int + ndiv_frac / 2^20) * (ref freqeuncy  / pdiv)
> + */
> +struct iproc_pll_vco_freq_param {
> +       unsigned long rate;
> +       unsigned int ndiv_int;
> +       unsigned int ndiv_frac;
> +       unsigned int pdiv;
> +};
> +
> +struct iproc_clk_reg_op {
> +       unsigned int offset;
> +       unsigned int shift;
> +       unsigned int width;
> +};
> +
> +/*
> + * Clock gating control at the top ASIU level
> + */
> +struct iproc_asiu_gate {
> +       unsigned int offset;
> +       unsigned int en_shift;
> +};
> +
> +/*
> + * Control of powering on/off of a PLL
> + *
> + * Before powering off a PLL, input isolation (ISO) needs to be enabled
> + */
> +struct iproc_pll_aon_pwr_ctrl {
> +       unsigned int offset;
> +       unsigned int pwr_width;
> +       unsigned int pwr_shift;
> +       unsigned int iso_shift;
> +};
> +
> +/*
> + * Control of the PLL reset, with Ki, Kp, and Ka parameters
> + */
> +struct iproc_pll_reset_ctrl {
> +       unsigned int offset;
> +       unsigned int reset_shift;
> +       unsigned int p_reset_shift;
> +       unsigned int ki_shift;
> +       unsigned int ki_width;
> +       unsigned int kp_shift;
> +       unsigned int kp_width;
> +       unsigned int ka_shift;
> +       unsigned int ka_width;
> +};
> +
> +struct iproc_pll_vco_ctrl {
> +       unsigned int u_offset;
> +       unsigned int l_offset;
> +};
> +
> +/*
> + * Main PLL control parameters
> + */
> +struct iproc_pll_ctrl {
> +       unsigned long flags;
> +       struct iproc_pll_aon_pwr_ctrl aon;
> +       struct iproc_asiu_gate asiu;
> +       struct iproc_pll_reset_ctrl reset;
> +       struct iproc_clk_reg_op ndiv_int;
> +       struct iproc_clk_reg_op ndiv_frac;
> +       struct iproc_clk_reg_op pdiv;
> +       struct iproc_pll_vco_ctrl vco_ctrl;
> +       struct iproc_clk_reg_op status;
> +};
> +
> +/*
> + * Controls enabling/disabling a PLL derived clock
> + */
> +struct iproc_clk_enable_ctrl {
> +       unsigned int offset;
> +       unsigned int enable_shift;
> +       unsigned int hold_shift;
> +       unsigned int bypass_shift;
> +};
> +
> +/*
> + * Main clock control parameters for clocks derived from the PLLs
> + */
> +struct iproc_clk_ctrl {
> +       unsigned int channel;
> +       unsigned long flags;
> +       struct iproc_clk_enable_ctrl enable;
> +       struct iproc_clk_reg_op mdiv;
> +};
> +
> +/*
> + * Divisor of the ASIU clocks
> + */
> +struct iproc_asiu_div {
> +       unsigned int offset;
> +       unsigned int en_shift;
> +       unsigned int high_shift;
> +       unsigned int high_width;
> +       unsigned int low_shift;
> +       unsigned int low_width;
> +};
> +
> +extern void __init iproc_armpll_setup(struct device_node *node);
> +extern void __init iproc_pll_setup(struct device_node *node,
> +               const struct iproc_pll_ctrl *ctrl,
> +               const struct iproc_pll_vco_freq_param *vco_param,
> +               unsigned int num_freqs);
> +extern void __init iproc_clk_setup(struct device_node *node,
> +               const struct iproc_clk_ctrl *ctrl, unsigned int num_clks);
> +extern void __init iproc_asiu_setup(struct device_node *node,
> +               const struct iproc_asiu_div *div,
> +               const struct iproc_asiu_gate *gate, unsigned int num_clks);
> +
> +#endif /* _CLK_IPROC_H */
> --
> 1.7.9.5
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Re: [PATCH 2/4] clk: iproc: add initial common clock support

[Tim Kryger]

On Thu, Dec 4, 2014 at 1:43 PM, Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org> wrote:
> This adds basic and generic support for various iProc PLLs and clocks
> including the ARMPLL, GENPLL, LCPLL, MIPIPLL, and ASIU clocks.
>
> SoCs under the iProc architecture can define their specific register
> offsets and clock parameters for their PLL and clock controllers. These
> parameters can be passed as arugments into the generic iProc PLL and
> clock setup functions
>
> Derived from code originally provided by Jonathan Richardson
> <jonathar-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>
> Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
> Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
> ---
>  drivers/clk/Makefile               |    2 +-
>  drivers/clk/bcm/Kconfig            |    9 +
>  drivers/clk/bcm/Makefile           |    1 +
>  drivers/clk/bcm/clk-iproc-armpll.c |  286 +++++++++++++++++++++
>  drivers/clk/bcm/clk-iproc-asiu.c   |  275 ++++++++++++++++++++
>  drivers/clk/bcm/clk-iproc-clk.c    |  238 ++++++++++++++++++
>  drivers/clk/bcm/clk-iproc-pll.c    |  483 ++++++++++++++++++++++++++++++++++++
>  drivers/clk/bcm/clk-iproc.h        |  155 ++++++++++++
>  8 files changed, 1448 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
>  create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
>  create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
>  create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
>  create mode 100644 drivers/clk/bcm/clk-iproc.h
>
> diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
> index d5fba5b..eff0213 100644
> --- a/drivers/clk/Makefile
> +++ b/drivers/clk/Makefile
> @@ -41,7 +41,7 @@ obj-$(CONFIG_ARCH_VT8500)             += clk-vt8500.o
>  obj-$(CONFIG_COMMON_CLK_WM831X)                += clk-wm831x.o
>  obj-$(CONFIG_COMMON_CLK_XGENE)         += clk-xgene.o
>  obj-$(CONFIG_COMMON_CLK_AT91)          += at91/
> -obj-$(CONFIG_ARCH_BCM_MOBILE)          += bcm/
> +obj-$(CONFIG_ARCH_BCM)                 += bcm/
>  obj-$(CONFIG_ARCH_BERLIN)              += berlin/
>  obj-$(CONFIG_ARCH_HI3xxx)              += hisilicon/
>  obj-$(CONFIG_ARCH_HIP04)               += hisilicon/

It may be best to move the above change into its own commit.

> diff --git a/drivers/clk/bcm/Kconfig b/drivers/clk/bcm/Kconfig
> index 75506e5..66b5b7f 100644
> --- a/drivers/clk/bcm/Kconfig
> +++ b/drivers/clk/bcm/Kconfig
> @@ -7,3 +7,12 @@ config CLK_BCM_KONA
>           Enable common clock framework support for Broadcom SoCs
>           using "Kona" style clock control units, including those
>           in the BCM281xx and BCM21664 families.
> +
> +config COMMON_CLK_IPROC
> +       bool "Broadcom iProc clock support"
> +       depends on ARCH_BCM_IPROC
> +       depends on COMMON_CLK
> +       default y
> +       help
> +         Enable common clock framework support for Broadcom SoCs
> +         based on the "iProc" architecture
> diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
> index 6297d05..6926636 100644
> --- a/drivers/clk/bcm/Makefile
> +++ b/drivers/clk/bcm/Makefile
> @@ -2,3 +2,4 @@ obj-$(CONFIG_CLK_BCM_KONA)      += clk-kona.o
>  obj-$(CONFIG_CLK_BCM_KONA)     += clk-kona-setup.o
>  obj-$(CONFIG_CLK_BCM_KONA)     += clk-bcm281xx.o
>  obj-$(CONFIG_CLK_BCM_KONA)     += clk-bcm21664.o
> +obj-$(CONFIG_COMMON_CLK_IPROC) += clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
> diff --git a/drivers/clk/bcm/clk-iproc-armpll.c b/drivers/clk/bcm/clk-iproc-armpll.c
> new file mode 100644
> index 0000000..ec9b130
> --- /dev/null
> +++ b/drivers/clk/bcm/clk-iproc-armpll.c
> @@ -0,0 +1,286 @@
> +/*
> + * Copyright (C) 2014 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/slab.h>
> +#include <linux/err.h>
> +#include <linux/clk-provider.h>
> +#include <linux/io.h>
> +#include <linux/of.h>
> +#include <linux/clkdev.h>
> +#include <linux/of_address.h>
> +
> +#define IPROC_CLK_MAX_FREQ_POLICY                    0x3
> +#define IPROC_CLK_POLICY_FREQ_OFFSET                 0x008
> +#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT      8
> +#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK       0x7
> +
> +#define IPROC_CLK_PLLARMA_OFFSET                     0xc00
> +#define IPROC_CLK_PLLARMA_LOCK_SHIFT                 28
> +#define IPROC_CLK_PLLARMA_PDIV_SHIFT                 24
> +#define IPROC_CLK_PLLARMA_PDIV_MASK                  0xf
> +#define IPROC_CLK_PLLARMA_NDIV_INT_SHIFT             8
> +#define IPROC_CLK_PLLARMA_NDIV_INT_MASK              0x3ff
> +
> +#define IPROC_CLK_PLLARMB_OFFSET                     0xc04
> +#define IPROC_CLK_PLLARMB_NDIV_FRAC_MASK             0xfffff
> +
> +#define IPROC_CLK_PLLARMC_OFFSET                     0xc08
> +#define IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT            8
> +#define IPROC_CLK_PLLARMC_MDIV_MASK                  0xff
> +
> +#define IPROC_CLK_PLLARMCTL5_OFFSET                  0xc20
> +#define IPROC_CLK_PLLARMCTL5_H_MDIV_MASK             0xff
> +
> +#define IPROC_CLK_PLLARM_OFFSET_OFFSET               0xc24
> +#define IPROC_CLK_PLLARM_SW_CTL_SHIFT                29
> +#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT       20
> +#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK        0xff
> +#define IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK       0xfffff
> +
> +#define IPROC_CLK_ARM_DIV_OFFSET                     0xe00
> +#define IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT  4
> +#define IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK        0xf
> +
> +#define IPROC_CLK_POLICY_DBG_OFFSET                  0xec0
> +#define IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT          12
> +#define IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK           0x7
> +
> +enum iproc_arm_pll_fid {
> +       ARM_PLL_FID_CRYSTAL_CLK   = 0,
> +       ARM_PLL_FID_SYS_CLK       = 2,
> +       ARM_PLL_FID_CH0_SLOW_CLK  = 6,
> +       ARM_PLL_FID_CH1_FAST_CLK  = 7
> +};
> +
> +struct iproc_arm_pll {
> +       struct clk_hw hw;
> +       void __iomem *base;
> +       struct clk_onecell_data clk_data;
> +       unsigned long rate;
> +};
> +
> +#define to_iproc_arm_pll(hw) container_of(hw, struct iproc_arm_pll, hw)
> +
> +static unsigned int __get_fid(struct iproc_arm_pll *pll)
> +{
> +       u32 val;
> +       unsigned int policy, fid, active_fid;
> +
> +       val = readl(pll->base + IPROC_CLK_ARM_DIV_OFFSET);
> +       if (val & (1 << IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT))
> +               policy = val & IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK;
> +       else
> +               policy = 0;
> +
> +       /* something is seriously wrong */
> +       BUG_ON(policy > IPROC_CLK_MAX_FREQ_POLICY);
> +
> +       val = readl(pll->base + IPROC_CLK_POLICY_FREQ_OFFSET);
> +       fid = (val >> (IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT * policy)) &
> +               IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK;
> +
> +       val = readl(pll->base + IPROC_CLK_POLICY_DBG_OFFSET);
> +       active_fid = IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK &
> +               (val >> IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT);
> +       if (fid != active_fid) {
> +               pr_debug("%s: fid override %u->%u\n", __func__, fid,
> +                               active_fid);
> +               fid = active_fid;
> +       }
> +
> +       pr_debug("%s: active fid: %u\n", __func__, fid);
> +
> +       return fid;
> +}
> +
> +/*
> + * Determine the mdiv (post divider) based on the frequency ID being used.
> + * There are 4 sources that can be used to derive the output clock rate:
> + *    - 25 MHz Crystal
> + *    - System clock
> + *    - PLL channel 0 (slow clock)
> + *    - PLL channel 1 (fast clock)
> + */
> +static int __get_mdiv(struct iproc_arm_pll *pll)
> +{
> +       unsigned int fid;
> +       int mdiv;
> +       u32 val;
> +
> +       fid = __get_fid(pll);
> +
> +       switch (fid) {
> +       case ARM_PLL_FID_CRYSTAL_CLK:
> +       case ARM_PLL_FID_SYS_CLK:
> +               mdiv = 1;
> +               break;
> +
> +       case ARM_PLL_FID_CH0_SLOW_CLK:
> +               val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
> +               mdiv = val & IPROC_CLK_PLLARMC_MDIV_MASK;
> +               if (mdiv == 0)
> +                       mdiv = 256;
> +               break;
> +
> +       case ARM_PLL_FID_CH1_FAST_CLK:
> +               val = readl(pll->base + IPROC_CLK_PLLARMCTL5_OFFSET);
> +               mdiv = val & IPROC_CLK_PLLARMCTL5_H_MDIV_MASK;
> +               if (mdiv == 0)
> +                       mdiv = 256;
> +               break;
> +
> +       default:
> +               mdiv = -EFAULT;
> +       }
> +
> +       return mdiv;
> +}
> +
> +static unsigned int __get_ndiv(struct iproc_arm_pll *pll)
> +{
> +       u32 val;
> +       unsigned int ndiv_int, ndiv_frac, ndiv;
> +
> +       val = readl(pll->base + IPROC_CLK_PLLARM_OFFSET_OFFSET);
> +       if (val & (1 << IPROC_CLK_PLLARM_SW_CTL_SHIFT)) {
> +               /*
> +                * offset mode is active. Read the ndiv from the PLLARM OFFSET
> +                * register
> +                */
> +               ndiv_int = (val >> IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT) &
> +                       IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK;
> +               if (ndiv_int == 0)
> +                       ndiv_int = 256;
> +
> +               ndiv_frac = val & IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK;
> +       } else {
> +               /* offset mode not active */
> +               val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
> +               ndiv_int = (val >> IPROC_CLK_PLLARMA_NDIV_INT_SHIFT) &
> +                       IPROC_CLK_PLLARMA_NDIV_INT_MASK;
> +               if (ndiv_int == 0)
> +                       ndiv_int = 1024;
> +
> +               val = readl(pll->base + IPROC_CLK_PLLARMB_OFFSET);
> +               ndiv_frac = val & IPROC_CLK_PLLARMB_NDIV_FRAC_MASK;
> +       }
> +
> +       ndiv = (ndiv_int << 20) | ndiv_frac;
> +
> +       return ndiv;
> +}
> +
> +/*
> + * The output frequency of the ARM PLL is calculated based on the ARM PLL
> + * divider values:
> + *   pdiv = ARM PLL pre-divider
> + *   ndiv = ARM PLL multiplier
> + *   mdiv = ARM PLL post divider
> + *
> + * The frequency is calculated by:
> + *   ((ndiv * parent clock rate) / pdiv) / mdiv
> + */
> +static unsigned long iproc_arm_pll_recalc_rate(struct clk_hw *hw,
> +               unsigned long parent_rate)
> +{
> +       struct iproc_arm_pll *pll = to_iproc_arm_pll(hw);
> +       u32 val;
> +       int mdiv;
> +       u64 ndiv;
> +       unsigned int pdiv;
> +
> +       /* in bypass mode, use parent rate */
> +       val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
> +       if (val & (1 << IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT)) {
> +               pll->rate = parent_rate;
> +               return pll->rate;
> +       }
> +
> +       /* PLL needs to be locked */
> +       val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
> +       if (!(val & (1 << IPROC_CLK_PLLARMA_LOCK_SHIFT))) {
> +               pll->rate = 0;
> +               return 0;
> +       }
> +
> +       pdiv = (val >> IPROC_CLK_PLLARMA_PDIV_SHIFT) &
> +               IPROC_CLK_PLLARMA_PDIV_MASK;
> +       if (pdiv == 0)
> +               pdiv = 16;
> +
> +       ndiv = __get_ndiv(pll);
> +       mdiv = __get_mdiv(pll);
> +       if (mdiv <= 0) {
> +               pll->rate = 0;
> +               return 0;
> +       }
> +       pll->rate = (ndiv * parent_rate) >> 20;
> +       pll->rate = (pll->rate / pdiv) / mdiv;
> +
> +       pr_debug("%s: ARM PLL rate: %lu. parent rate: %lu\n", __func__,
> +                       pll->rate, parent_rate);
> +       pr_debug("%s: ndiv_int: %u, pdiv: %u, mdiv: %d\n", __func__,
> +                       (unsigned int)(ndiv >> 20), pdiv, mdiv);
> +
> +       return pll->rate;
> +}
> +
> +static const struct clk_ops iproc_arm_pll_ops = {
> +       .recalc_rate = iproc_arm_pll_recalc_rate,
> +};
> +
> +void __init iproc_armpll_setup(struct device_node *node)
> +{
> +       int ret;
> +       struct clk *clk;
> +       struct iproc_arm_pll *pll;
> +       struct clk_init_data init;
> +       const char *parent_name;
> +
> +       pll = kzalloc(sizeof(*pll), GFP_KERNEL);
> +       if (WARN_ON(!pll))
> +               return;
> +
> +       pll->base = of_iomap(node, 0);
> +       if (WARN_ON(!pll->base))
> +               goto err_free_pll;
> +
> +       init.name = node->name;
> +       init.ops = &iproc_arm_pll_ops;
> +       init.flags = 0;
> +       parent_name = of_clk_get_parent_name(node, 0);
> +       init.parent_names = (parent_name ? &parent_name : NULL);
> +       init.num_parents = (parent_name ? 1 : 0);
> +       pll->hw.init = &init;
> +
> +       clk = clk_register(NULL, &pll->hw);
> +       if (WARN_ON(IS_ERR(clk)))
> +               goto err_iounmap;
> +
> +       pll->clk_data.clk_num = 1;
> +       pll->clk_data.clks = &clk;
> +
> +       ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
> +       if (WARN_ON(ret))
> +               goto err_clk_unregister;
> +
> +       return;
> +
> +err_clk_unregister:
> +       clk_unregister(clk);
> +err_iounmap:
> +       iounmap(pll->base);
> +err_free_pll:
> +       kfree(pll);
> +}
> diff --git a/drivers/clk/bcm/clk-iproc-asiu.c b/drivers/clk/bcm/clk-iproc-asiu.c
> new file mode 100644
> index 0000000..ab86b8c
> --- /dev/null
> +++ b/drivers/clk/bcm/clk-iproc-asiu.c
> @@ -0,0 +1,275 @@
> +/*
> + * Copyright (C) 2014 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/err.h>
> +#include <linux/clk-provider.h>
> +#include <linux/io.h>
> +#include <linux/of.h>
> +#include <linux/clkdev.h>
> +#include <linux/of_address.h>
> +#include <linux/delay.h>
> +
> +#include "clk-iproc.h"
> +
> +struct iproc_asiu;
> +
> +struct iproc_asiu_clk {
> +       struct clk_hw hw;
> +       const char *name;
> +       struct iproc_asiu *asiu;
> +       unsigned long rate;
> +       struct iproc_asiu_div div;
> +       struct iproc_asiu_gate gate;
> +};
> +
> +struct iproc_asiu {
> +       void __iomem *div_base;
> +       void __iomem *gate_base;
> +
> +       struct clk_onecell_data clk_data;
> +       struct iproc_asiu_clk *clks;
> +};
> +
> +#define to_asiu_clk(hw) container_of(hw, struct iproc_asiu_clk, hw)
> +
> +static int iproc_asiu_clk_enable(struct clk_hw *hw)
> +{
> +       struct iproc_asiu_clk *clk = to_asiu_clk(hw);
> +       struct iproc_asiu *asiu = clk->asiu;
> +       u32 val;
> +
> +       /* some clocks at the ASIU level are always enabled */
> +       if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
> +               return 0;
> +
> +       val = readl(asiu->gate_base + clk->gate.offset);
> +       val |= (1 << clk->gate.en_shift);
> +       writel(val, asiu->gate_base + clk->gate.offset);
> +
> +       return 0;
> +}
> +
> +static void iproc_asiu_clk_disable(struct clk_hw *hw)
> +{
> +       struct iproc_asiu_clk *clk = to_asiu_clk(hw);
> +       struct iproc_asiu *asiu = clk->asiu;
> +       u32 val;
> +
> +       /* some clocks at the ASIU level are always enabled */
> +       if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
> +               return;
> +
> +       val = readl(asiu->gate_base + clk->gate.offset);
> +       val &= ~(1 << clk->gate.en_shift);
> +       writel(val, asiu->gate_base + clk->gate.offset);
> +}
> +
> +static unsigned long iproc_asiu_clk_recalc_rate(struct clk_hw *hw,
> +               unsigned long parent_rate)
> +{
> +       struct iproc_asiu_clk *clk = to_asiu_clk(hw);
> +       struct iproc_asiu *asiu = clk->asiu;
> +       u32 val;
> +       unsigned int div_h, div_l;
> +
> +       if (parent_rate == 0) {
> +               clk->rate = 0;
> +               return 0;
> +       }
> +
> +       /* if clock divisor is not enabled, simply return parent rate */
> +       val = readl(asiu->div_base + clk->div.offset);
> +       if ((val & (1 << clk->div.en_shift)) == 0) {
> +               clk->rate = parent_rate;
> +               return parent_rate;
> +       }
> +
> +       /* clock rate = parent rate / (high_div + 1) + (low_div + 1) */
> +       div_h = (val >> clk->div.high_shift) & bit_mask(clk->div.high_width);
> +       div_h++;
> +       div_l = (val >> clk->div.low_shift) & bit_mask(clk->div.low_width);
> +       div_l++;
> +
> +       clk->rate = parent_rate / (div_h + div_l);
> +       pr_debug("%s: rate: %lu. parent rate: %lu div_h: %u div_l: %u\n",
> +               __func__, clk->rate, parent_rate, div_h, div_l);
> +
> +       return clk->rate;
> +}
> +
> +static long iproc_asiu_clk_round_rate(struct clk_hw *hw, unsigned long rate,
> +               unsigned long *parent_rate)
> +{
> +       unsigned int div;
> +
> +       if (rate == 0 || *parent_rate == 0)
> +               return -EINVAL;
> +
> +       if (rate == *parent_rate)
> +               return *parent_rate;
> +
> +       div = DIV_ROUND_UP(*parent_rate, rate);
> +       if (div < 2)
> +               return *parent_rate;
> +
> +       return *parent_rate / div;
> +}
> +
> +static int iproc_asiu_clk_set_rate(struct clk_hw *hw, unsigned long rate,
> +               unsigned long parent_rate)
> +{
> +       struct iproc_asiu_clk *clk = to_asiu_clk(hw);
> +       struct iproc_asiu *asiu = clk->asiu;
> +       unsigned int div, div_h, div_l;
> +       u32 val;
> +
> +       if (rate == 0 || parent_rate == 0)
> +               return -EINVAL;
> +
> +       /* simply disable the divisor if one wants the same rate as parent */
> +       if (rate == parent_rate) {
> +               val = readl(asiu->div_base + clk->div.offset);
> +               val &= ~(1 << clk->div.en_shift);
> +               writel(val, asiu->div_base + clk->div.offset);
> +               return 0;
> +       }
> +
> +       div = DIV_ROUND_UP(parent_rate, rate);
> +       if (div < 2)
> +               return -EINVAL;
> +
> +       div_h = div_l = div >> 1;
> +       div_h--;
> +       div_l--;
> +
> +       val = readl(asiu->div_base + clk->div.offset);
> +       val |= 1 << clk->div.en_shift;
> +       if (div_h) {
> +               val &= ~(bit_mask(clk->div.high_width)
> +                               << clk->div.high_shift);
> +               val |= div_h << clk->div.high_shift;
> +       } else {
> +               val &= ~(bit_mask(clk->div.high_width)
> +                               << clk->div.high_shift);
> +       }
> +       if (div_l) {
> +               val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
> +               val |= div_l << clk->div.low_shift;
> +       } else {
> +               val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
> +       }
> +       writel(val, asiu->div_base + clk->div.offset);
> +
> +       return 0;
> +}
> +
> +static const struct clk_ops iproc_asiu_ops = {
> +       .enable = iproc_asiu_clk_enable,
> +       .disable = iproc_asiu_clk_disable,
> +       .recalc_rate = iproc_asiu_clk_recalc_rate,
> +       .round_rate = iproc_asiu_clk_round_rate,
> +       .set_rate = iproc_asiu_clk_set_rate,
> +};
> +
> +void __init iproc_asiu_setup(struct device_node *node,
> +               const struct iproc_asiu_div *div,
> +               const struct iproc_asiu_gate *gate, unsigned int num_clks)
> +{
> +       int i, ret;
> +       struct iproc_asiu *asiu;
> +
> +       if (WARN_ON(!gate || !div))
> +               return;
> +
> +       asiu = kzalloc(sizeof(*asiu), GFP_KERNEL);
> +       if (WARN_ON(!asiu))
> +               return;
> +
> +       asiu->clk_data.clk_num = num_clks;
> +       asiu->clk_data.clks = kcalloc(num_clks, sizeof(*asiu->clk_data.clks),
> +                       GFP_KERNEL);
> +       if (WARN_ON(!asiu->clk_data.clks))
> +               goto err_clks;
> +
> +       asiu->clks = kcalloc(num_clks, sizeof(*asiu->clks), GFP_KERNEL);
> +       if (WARN_ON(!asiu->clks))
> +               goto err_asiu_clks;
> +
> +       asiu->div_base = of_iomap(node, 0);
> +       if (WARN_ON(!asiu->div_base))
> +               goto err_iomap_div;
> +
> +       asiu->gate_base = of_iomap(node, 1);
> +       if (WARN_ON(!asiu->gate_base))
> +               goto err_iomap_gate;
> +
> +       for (i = 0; i < num_clks; i++) {
> +               struct clk_init_data init;
> +               struct clk *clk;
> +               const char *parent_name;
> +               struct iproc_asiu_clk *asiu_clk;
> +               const char *clk_name;
> +
> +               clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
> +               if (WARN_ON(!clk_name))
> +                       goto err_clk_register;
> +
> +               ret = of_property_read_string_index(node, "clock-output-names",
> +                               i, &clk_name);
> +               if (WARN_ON(ret))
> +                       goto err_clk_register;
> +
> +               asiu_clk = &asiu->clks[i];
> +               asiu_clk->name = clk_name;
> +               asiu_clk->asiu = asiu;
> +               asiu_clk->div = div[i];
> +               asiu_clk->gate = gate[i];
> +               init.name = clk_name;
> +               init.ops = &iproc_asiu_ops;
> +               init.flags = 0;
> +               parent_name = of_clk_get_parent_name(node, 0);
> +               init.parent_names = (parent_name ? &parent_name : NULL);
> +               init.num_parents = (parent_name ? 1 : 0);
> +               asiu_clk->hw.init = &init;
> +
> +               clk = clk_register(NULL, &asiu_clk->hw);
> +               if (WARN_ON(IS_ERR(clk)))
> +                       goto err_clk_register;
> +               asiu->clk_data.clks[i] = clk;
> +       }
> +
> +       ret = of_clk_add_provider(node, of_clk_src_onecell_get,
> +                       &asiu->clk_data);
> +       if (WARN_ON(ret))
> +               goto err_clk_register;
> +
> +       return;
> +
> +err_clk_register:
> +       for (i = 0; i < num_clks; i++)
> +               kfree(asiu->clks[i].name);
> +       iounmap(asiu->gate_base);
> +
> +err_iomap_gate:
> +       iounmap(asiu->div_base);
> +
> +err_iomap_div:
> +       kfree(asiu->clks);
> +
> +err_asiu_clks:
> +       kfree(asiu->clk_data.clks);
> +
> +err_clks:
> +       kfree(asiu);
> +}
> diff --git a/drivers/clk/bcm/clk-iproc-clk.c b/drivers/clk/bcm/clk-iproc-clk.c
> new file mode 100644
> index 0000000..be3c42c
> --- /dev/null
> +++ b/drivers/clk/bcm/clk-iproc-clk.c
> @@ -0,0 +1,238 @@
> +/*
> + * Copyright (C) 2014 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/err.h>
> +#include <linux/clk-provider.h>
> +#include <linux/io.h>
> +#include <linux/of.h>
> +#include <linux/clkdev.h>
> +#include <linux/of_address.h>
> +#include <linux/delay.h>
> +
> +#include "clk-iproc.h"
> +
> +struct iproc_pll;
> +
> +struct iproc_clk {
> +       struct clk_hw hw;
> +       const char *name;
> +       struct iproc_pll *pll;
> +       unsigned long rate;
> +       const struct iproc_clk_ctrl *ctrl;
> +};
> +
> +struct iproc_pll {
> +       void __iomem *base;
> +       struct clk_onecell_data clk_data;
> +       struct iproc_clk *clks;
> +};
> +
> +#define to_iproc_clk(hw) container_of(hw, struct iproc_clk, hw)
> +
> +static int iproc_clk_enable(struct clk_hw *hw)
> +{
> +       struct iproc_clk *clk = to_iproc_clk(hw);
> +       const struct iproc_clk_ctrl *ctrl = clk->ctrl;
> +       struct iproc_pll *pll = clk->pll;
> +       u32 val;
> +
> +       /* channel enable is active low */
> +       val = readl(pll->base + ctrl->enable.offset);
> +       val &= ~(1 << ctrl->enable.enable_shift);
> +       writel(val, pll->base + ctrl->enable.offset);
> +
> +       /* also make sure channel is not held */
> +       val = readl(pll->base + ctrl->enable.offset);
> +       val &= ~(1 << ctrl->enable.hold_shift);
> +       writel(val, pll->base + ctrl->enable.offset);
> +
> +       return 0;
> +}
> +
> +static void iproc_clk_disable(struct clk_hw *hw)
> +{
> +       struct iproc_clk *clk = to_iproc_clk(hw);
> +       const struct iproc_clk_ctrl *ctrl = clk->ctrl;
> +       struct iproc_pll *pll = clk->pll;
> +       u32 val;
> +
> +       if (ctrl->flags & IPROC_CLK_AON)
> +               return;
> +
> +       val = readl(pll->base + ctrl->enable.offset);
> +       val |= 1 << ctrl->enable.enable_shift;
> +       writel(val, pll->base + ctrl->enable.offset);
> +}
> +
> +static unsigned long iproc_clk_recalc_rate(struct clk_hw *hw,
> +               unsigned long parent_rate)
> +{
> +       struct iproc_clk *clk = to_iproc_clk(hw);
> +       const struct iproc_clk_ctrl *ctrl = clk->ctrl;
> +       struct iproc_pll *pll = clk->pll;
> +       u32 val;
> +       unsigned int mdiv;
> +
> +       if (parent_rate == 0)
> +               return 0;
> +
> +       val = readl(pll->base + ctrl->mdiv.offset);
> +       mdiv = (val >> ctrl->mdiv.shift) & bit_mask(ctrl->mdiv.width);
> +       if (mdiv == 0)
> +               mdiv = 256;
> +
> +       clk->rate = parent_rate / mdiv;
> +
> +       return clk->rate;
> +}
> +
> +static long iproc_clk_round_rate(struct clk_hw *hw, unsigned long rate,
> +               unsigned long *parent_rate)
> +{
> +       unsigned int div;
> +
> +       if (rate == 0 || *parent_rate == 0)
> +               return -EINVAL;
> +
> +       if (rate == *parent_rate)
> +               return *parent_rate;
> +
> +       div = DIV_ROUND_UP(*parent_rate, rate);
> +       if (div < 2)
> +               return *parent_rate;
> +
> +       if (div > 256)
> +               div = 256;
> +
> +       return *parent_rate / div;
> +}
> +
> +static int iproc_clk_set_rate(struct clk_hw *hw, unsigned long rate,
> +               unsigned long parent_rate)
> +{
> +       struct iproc_clk *clk = to_iproc_clk(hw);
> +       const struct iproc_clk_ctrl *ctrl = clk->ctrl;
> +       struct iproc_pll *pll = clk->pll;
> +       u32 val;
> +       unsigned int div;
> +
> +       if (rate == 0 || parent_rate == 0)
> +               return -EINVAL;
> +
> +       div = DIV_ROUND_UP(parent_rate, rate);
> +       if (div > 256)
> +               return -EINVAL;
> +
> +       val = readl(pll->base + ctrl->mdiv.offset);
> +       if (div == 256) {
> +               val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
> +       } else {
> +               val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
> +               val |= div << ctrl->mdiv.shift;
> +       }
> +       writel(val, pll->base + ctrl->mdiv.offset);
> +       clk->rate = parent_rate / div;
> +
> +       return 0;
> +}
> +
> +static const struct clk_ops iproc_clk_ops = {
> +       .enable = iproc_clk_enable,
> +       .disable = iproc_clk_disable,
> +       .recalc_rate = iproc_clk_recalc_rate,
> +       .round_rate = iproc_clk_round_rate,
> +       .set_rate = iproc_clk_set_rate,
> +};
> +
> +void __init iproc_clk_setup(struct device_node *node,
> +               const struct iproc_clk_ctrl *ctrl, unsigned int num_clks)
> +{
> +       int i, ret;
> +       struct iproc_pll *pll;
> +
> +       if (WARN_ON(!ctrl))
> +               return;
> +
> +       pll = kzalloc(sizeof(*pll), GFP_KERNEL);
> +       if (WARN_ON(!pll))
> +               return;
> +
> +       pll->clk_data.clk_num = num_clks;
> +       pll->clk_data.clks = kcalloc(num_clks, sizeof(*pll->clk_data.clks),
> +                       GFP_KERNEL);
> +       if (WARN_ON(!pll->clk_data.clks))
> +               goto err_clks;
> +
> +       pll->clks = kcalloc(num_clks, sizeof(*pll->clks), GFP_KERNEL);
> +       if (WARN_ON(!pll->clks))
> +               goto err_pll_clks;
> +
> +       pll->base = of_iomap(node, 0);
> +       if (WARN_ON(!pll->base))
> +               goto err_iomap;
> +
> +       for (i = 0; i < num_clks; i++) {
> +               struct clk_init_data init;
> +               struct clk *clk;
> +               const char *parent_name;
> +               struct iproc_clk *iclk;
> +               const char *clk_name;
> +
> +               clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
> +               if (WARN_ON(!clk_name))
> +                       goto err_clk_register;
> +
> +               ret = of_property_read_string_index(node, "clock-output-names",
> +                               i, &clk_name);
> +               if (WARN_ON(ret))
> +                       goto err_clk_register;
> +
> +               iclk = &pll->clks[i];
> +               iclk->name = clk_name;
> +               iclk->pll = pll;
> +               iclk->ctrl = &ctrl[i];
> +               init.name = clk_name;
> +               init.ops = &iproc_clk_ops;
> +               init.flags = 0;
> +               parent_name = of_clk_get_parent_name(node, 0);
> +               init.parent_names = (parent_name ? &parent_name : NULL);
> +               init.num_parents = (parent_name ? 1 : 0);
> +               iclk->hw.init = &init;
> +
> +               clk = clk_register(NULL, &iclk->hw);
> +               if (WARN_ON(IS_ERR(clk)))
> +                       goto err_clk_register;
> +               pll->clk_data.clks[i] = clk;
> +       }
> +
> +       ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
> +       if (WARN_ON(ret))
> +               goto err_clk_register;
> +
> +       return;
> +
> +err_clk_register:
> +       for (i = 0; i < num_clks; i++)
> +               kfree(pll->clks[i].name);
> +       iounmap(pll->base);
> +
> +err_iomap:
> +       kfree(pll->clks);
> +
> +err_pll_clks:
> +       kfree(pll->clk_data.clks);
> +
> +err_clks:
> +       kfree(pll);
> +}
> diff --git a/drivers/clk/bcm/clk-iproc-pll.c b/drivers/clk/bcm/clk-iproc-pll.c
> new file mode 100644
> index 0000000..cd3bd38
> --- /dev/null
> +++ b/drivers/clk/bcm/clk-iproc-pll.c
> @@ -0,0 +1,483 @@
> +/*
> + * Copyright (C) 2014 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/err.h>
> +#include <linux/clk-provider.h>
> +#include <linux/io.h>
> +#include <linux/of.h>
> +#include <linux/clkdev.h>
> +#include <linux/of_address.h>
> +#include <linux/delay.h>
> +
> +#include "clk-iproc.h"
> +
> +#define PLL_VCO_HIGH_SHIFT 19
> +#define PLL_VCO_LOW_SHIFT  30
> +
> +/* number of delay loops waiting for PLL to lock */
> +#define LOCK_DELAY 100
> +
> +/* number of VCO frequency bands */
> +#define NUM_FREQ_BANDS 8
> +
> +#define NUM_KP_BANDS 3
> +enum kp_band {
> +       KP_BAND_MID = 0,
> +       KP_BAND_HIGH,
> +       KP_BAND_HIGH_HIGH
> +};
> +
> +static const unsigned int kp_table[NUM_KP_BANDS][NUM_FREQ_BANDS] = {
> +       { 5, 6, 6, 7, 7, 8, 9, 10 },
> +       { 4, 4, 5, 5, 6, 7, 8, 9  },
> +       { 4, 5, 5, 6, 7, 8, 9, 10 },
> +};
> +
> +static const unsigned long ref_freq_table[NUM_FREQ_BANDS][2] = {
> +       { 10000000,  12500000  },
> +       { 12500000,  15000000  },
> +       { 15000000,  20000000  },
> +       { 20000000,  25000000  },
> +       { 25000000,  50000000  },
> +       { 50000000,  75000000  },
> +       { 75000000,  100000000 },
> +       { 100000000, 125000000 },
> +};
> +
> +enum vco_freq_range {
> +       VCO_LOW       = 700000000U,
> +       VCO_MID       = 1200000000U,
> +       VCO_HIGH      = 2200000000U,
> +       VCO_HIGH_HIGH = 3100000000U,
> +       VCO_MAX       = 4000000000U,
> +};
> +
> +struct iproc_pll {
> +       struct clk_hw hw;
> +       void __iomem *pll_base;
> +       void __iomem *pwr_base;
> +       void __iomem *asiu_base;
> +       struct clk_onecell_data clk_data;
> +       const char *name;
> +       const struct iproc_pll_ctrl *ctrl;
> +       const struct iproc_pll_vco_freq_param *vco_param;
> +       unsigned int num_vco_entries;
> +       unsigned long rate;
> +};
> +
> +#define to_iproc_pll(hw) container_of(hw, struct iproc_pll, hw)
> +
> +/*
> + * Get the clock rate based on name
> + */
> +static unsigned long __get_rate(const char *clk_name)
> +{
> +       struct clk *clk;
> +
> +       clk = __clk_lookup(clk_name);
> +       if (!clk) {
> +               pr_err("%s: unable to find clock by name: %s\n", __func__,
> +                               clk_name);
> +               return 0;
> +       }
> +
> +       return clk_get_rate(clk);
> +}
> +
> +/*
> + * Based on the target frequency, find a match from the VCO frequency parameter
> + * table and return its index
> + */
> +static int pll_get_rate_index(struct iproc_pll *pll, unsigned int target_rate)
> +{
> +       int i;
> +
> +       for (i = 0; i < pll->num_vco_entries; i++)
> +               if (target_rate == pll->vco_param[i].rate)
> +                       break;
> +
> +       if (i >= pll->num_vco_entries)
> +               return -EINVAL;
> +
> +       return i;
> +}
> +
> +static int get_kp(unsigned long ref_freq, enum kp_band kp_index)
> +{
> +       int i;
> +
> +       if (ref_freq < ref_freq_table[0][0])
> +               return -EINVAL;
> +
> +       for (i = 0; i < NUM_FREQ_BANDS; i++) {
> +               if (ref_freq >= ref_freq_table[i][0] &&
> +                       ref_freq < ref_freq_table[i][1])
> +                       return kp_table[kp_index][i];
> +       }
> +       return -EINVAL;
> +}
> +
> +static int pll_wait_for_lock(struct iproc_pll *pll)
> +{
> +       int i;
> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
> +
> +       for (i = 0; i < LOCK_DELAY; i++) {
> +               u32 val = readl(pll->pll_base + ctrl->status.offset);
> +
> +               if (val & (1 << ctrl->status.shift))
> +                       return 0;
> +               udelay(10);
> +       }
> +
> +       return -EIO;
> +}
> +
> +static void __pll_disable(struct iproc_pll *pll)
> +{
> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
> +       u32 val;
> +
> +       if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
> +               val = readl(pll->asiu_base + ctrl->asiu.offset);
> +               val &= ~(1 << ctrl->asiu.en_shift);
> +               writel(val, pll->asiu_base + ctrl->asiu.offset);
> +       }
> +
> +       /* latch input value so core power can be shut down */
> +       val = readl(pll->pwr_base + ctrl->aon.offset);
> +       val |= (1 << ctrl->aon.iso_shift);
> +       writel(val, pll->pwr_base + ctrl->aon.offset);
> +
> +       /* power down the core */
> +       val &= ~(bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift);
> +       writel(val, pll->pwr_base + ctrl->aon.offset);
> +}
> +
> +static int __pll_enable(struct iproc_pll *pll)
> +{
> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
> +       u32 val;
> +
> +       /* power up the PLL and make sure it's not latched */
> +       val = readl(pll->pwr_base + ctrl->aon.offset);
> +       val |= bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift;
> +       val &= ~(1 << ctrl->aon.iso_shift);
> +       writel(val, pll->pwr_base + ctrl->aon.offset);
> +
> +       /* certain PLLs also need to be ungated from the ASIU top level */
> +       if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
> +               val = readl(pll->asiu_base + ctrl->asiu.offset);
> +               val |= (1 << ctrl->asiu.en_shift);
> +               writel(val, pll->asiu_base + ctrl->asiu.offset);
> +       }
> +
> +       return 0;
> +}
> +
> +static void __pll_put_in_reset(struct iproc_pll *pll)
> +{
> +       u32 val;
> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
> +       const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
> +
> +       val = readl(pll->pll_base + reset->offset);
> +       val &= ~(1 << reset->reset_shift | 1 << reset->p_reset_shift);
> +       writel(val, pll->pll_base + reset->offset);
> +}
> +
> +static void __pll_bring_out_reset(struct iproc_pll *pll, unsigned int kp,
> +               unsigned int ka, unsigned int ki)
> +{
> +       u32 val;
> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
> +       const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
> +
> +       val = readl(pll->pll_base + reset->offset);
> +       val &= ~(bit_mask(reset->ki_width) << reset->ki_shift |
> +               bit_mask(reset->kp_width) << reset->kp_shift |
> +               bit_mask(reset->ka_width) << reset->ka_shift);
> +       val |=  ki << reset->ki_shift | kp << reset->kp_shift |
> +               ka << reset->ka_shift;
> +       val |= 1 << reset->reset_shift | 1 << reset->p_reset_shift;
> +       writel(val, pll->pll_base + reset->offset);
> +}
> +
> +static int pll_set_rate(struct iproc_pll *pll, unsigned int rate_index,
> +               unsigned long parent_rate)
> +{
> +       const struct iproc_pll_vco_freq_param *vco =
> +                               &pll->vco_param[rate_index];
> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
> +       int ka = 0, ki, kp, ret;
> +       unsigned long rate = vco->rate;
> +       u32 val;
> +       enum kp_band kp_index;
> +       unsigned long ref_freq;
> +
> +       /*
> +        * reference frequency = parent frequency / PDIV
> +        * If PDIV = 0, then it becomes a multiplier (x2)
> +        */
> +       if (vco->pdiv == 0)
> +               ref_freq = parent_rate * 2;
> +       else
> +               ref_freq = parent_rate / vco->pdiv;
> +
> +       /* determine Ki and Kp index based on target VCO frequency */
> +       if (rate >= VCO_LOW && rate < VCO_HIGH) {
> +               ki = 4;
> +               kp_index = KP_BAND_MID;
> +       } else if (rate >= VCO_HIGH && rate && rate < VCO_HIGH_HIGH) {
> +               ki = 3;
> +               kp_index = KP_BAND_HIGH;
> +       } else if (rate >= VCO_HIGH_HIGH && rate < VCO_MAX) {
> +               ki = 3;
> +               kp_index = KP_BAND_HIGH_HIGH;
> +       } else {
> +               pr_err("%s: pll: %s has invalid rate: %lu\n", __func__,
> +                               pll->name, rate);
> +               return -EINVAL;
> +       }
> +
> +       kp = get_kp(ref_freq, kp_index);
> +       if (kp < 0) {
> +               pr_err("%s: pll: %s has invalid kp\n", __func__, pll->name);
> +               return kp;
> +       }
> +
> +       ret = __pll_enable(pll);
> +       if (ret) {
> +               pr_err("%s: pll: %s fails to enable\n", __func__, pll->name);
> +               return ret;
> +       }
> +
> +       /* put PLL in reset */
> +       __pll_put_in_reset(pll);
> +
> +       writel(0, pll->pll_base + ctrl->vco_ctrl.u_offset);
> +       val = readl(pll->pll_base + ctrl->vco_ctrl.l_offset);
> +
> +       if (rate >= VCO_LOW && rate < VCO_MID)
> +               val |= (1 << PLL_VCO_LOW_SHIFT);
> +
> +       if (rate < VCO_HIGH)
> +               val &= ~(1 << PLL_VCO_HIGH_SHIFT);
> +       else
> +               val |= (1 << PLL_VCO_HIGH_SHIFT);
> +
> +       writel(val, pll->pll_base + ctrl->vco_ctrl.l_offset);
> +
> +       /* program integer part of NDIV */
> +       val = readl(pll->pll_base + ctrl->ndiv_int.offset);
> +       val &= ~(bit_mask(ctrl->ndiv_int.width) << ctrl->ndiv_int.shift);
> +       val |= vco->ndiv_int << ctrl->ndiv_int.shift;
> +       writel(val, pll->pll_base + ctrl->ndiv_int.offset);
> +
> +       /* program fractional part of NDIV */
> +       if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
> +               val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
> +               val &= ~(bit_mask(ctrl->ndiv_frac.width) <<
> +                               ctrl->ndiv_frac.shift);
> +               val |= vco->ndiv_frac << ctrl->ndiv_frac.shift;
> +               writel(val, pll->pll_base + ctrl->ndiv_frac.offset);
> +       }
> +
> +       /* program PDIV */
> +       val = readl(pll->pll_base + ctrl->pdiv.offset);
> +       val &= ~(bit_mask(ctrl->pdiv.width) << ctrl->pdiv.shift);
> +       val |= vco->pdiv << ctrl->pdiv.shift;
> +       writel(val, pll->pll_base + ctrl->pdiv.offset);
> +
> +       __pll_bring_out_reset(pll, kp, ka, ki);
> +
> +       ret = pll_wait_for_lock(pll);
> +       if (ret < 0) {
> +               pr_err("%s: pll: %s failed to lock\n", __func__, pll->name);
> +               return ret;
> +       }
> +
> +       return 0;
> +}
> +
> +static int iproc_pll_enable(struct clk_hw *hw)
> +{
> +       struct iproc_pll *pll = to_iproc_pll(hw);
> +
> +       return __pll_enable(pll);
> +}
> +
> +static void iproc_pll_disable(struct clk_hw *hw)
> +{
> +       struct iproc_pll *pll = to_iproc_pll(hw);
> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
> +
> +       if (ctrl->flags & IPROC_CLK_AON)
> +               return;
> +
> +       __pll_disable(pll);
> +}
> +
> +static unsigned long iproc_pll_recalc_rate(struct clk_hw *hw,
> +       unsigned long parent_rate)
> +{
> +       struct iproc_pll *pll = to_iproc_pll(hw);
> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
> +       u32 val;
> +       u64 ndiv;
> +       unsigned int ndiv_int, ndiv_frac, pdiv;
> +
> +       if (parent_rate == 0)
> +               return 0;
> +
> +       /* PLL needs to be locked */
> +       val = readl(pll->pll_base + ctrl->status.offset);
> +       if ((val & (1 << ctrl->status.shift)) == 0) {
> +               pll->rate = 0;
> +               return 0;
> +       }
> +
> +       /*
> +        * PLL output frequency =
> +        *
> +        * ((ndiv_int + ndiv_frac / 2^20) * (parent clock rate / pdiv)
> +        */
> +       val = readl(pll->pll_base + ctrl->ndiv_int.offset);
> +       ndiv_int = (val >> ctrl->ndiv_int.shift) &
> +               bit_mask(ctrl->ndiv_int.width);
> +       ndiv = ndiv_int << ctrl->ndiv_int.shift;
> +
> +       if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
> +               val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
> +               ndiv_frac = (val >> ctrl->ndiv_frac.shift) &
> +                       bit_mask(ctrl->ndiv_frac.width);
> +
> +               if (ndiv_frac != 0)
> +                       ndiv = (ndiv_int << ctrl->ndiv_int.shift) | ndiv_frac;
> +       }
> +
> +       val = readl(pll->pll_base + ctrl->pdiv.offset);
> +       pdiv = (val >> ctrl->pdiv.shift) & bit_mask(ctrl->pdiv.width);
> +
> +       pll->rate = (ndiv * parent_rate) >> ctrl->ndiv_int.shift;
> +
> +       if (pdiv == 0)
> +               pll->rate *= 2;
> +       else
> +               pll->rate /= pdiv;
> +
> +       return pll->rate;
> +}
> +
> +static const struct clk_ops iproc_pll_ops = {
> +       .enable = iproc_pll_enable,
> +       .disable = iproc_pll_disable,
> +       .recalc_rate = iproc_pll_recalc_rate,
> +};
> +
> +void __init iproc_pll_setup(struct device_node *node,
> +               const struct iproc_pll_ctrl *ctrl,
> +               const struct iproc_pll_vco_freq_param *vco_param,
> +               unsigned int num_vco_entries)
> +{
> +       int ret;
> +       struct clk *clk;
> +       struct iproc_pll *pll;
> +       struct clk_init_data init;
> +       const char *parent_name;
> +       unsigned int rate;
> +
> +       if (WARN_ON(!ctrl))
> +               return;
> +
> +       pll = kzalloc(sizeof(*pll), GFP_KERNEL);
> +       if (WARN_ON(!pll))
> +               return;
> +
> +       pll->pll_base = of_iomap(node, 0);
> +       if (WARN_ON(!pll->pll_base))
> +               goto err_pll_iomap;
> +
> +       pll->pwr_base = of_iomap(node, 1);
> +       if (WARN_ON(!pll->pwr_base))
> +               goto err_pwr_iomap;
> +
> +       /* some PLLs require gating control at the top ASIU level */
> +       if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
> +               pll->asiu_base = of_iomap(node, 2);
> +               if (WARN_ON(!pll->asiu_base))
> +                       goto err_asiu_iomap;
> +       }
> +
> +       pll->ctrl = ctrl;
> +       pll->name = node->name;
> +       init.name = node->name;
> +       init.ops = &iproc_pll_ops;
> +       init.flags = 0;
> +       parent_name = of_clk_get_parent_name(node, 0);
> +       init.parent_names = (parent_name ? &parent_name : NULL);
> +       init.num_parents = (parent_name ? 1 : 0);
> +       pll->hw.init = &init;
> +
> +       /* configure the PLL to the desired VCO frequency if specified */
> +       ret = of_property_read_u32(node, "clock-frequency", &rate);
> +       if (!ret) {
> +               unsigned long parent_rate;
> +               int rate_index;
> +
> +               if (WARN_ON(!vco_param))
> +                       goto err_clk_register;
> +
> +               pll->num_vco_entries = num_vco_entries;
> +               pll->vco_param = vco_param;
> +
> +               parent_rate = __get_rate(parent_name);
> +               if (WARN_ON(!parent_rate))
> +                       goto err_clk_register;
> +
> +               rate_index = pll_get_rate_index(pll, rate);
> +               if (WARN_ON(rate_index < 0))
> +                       goto err_clk_register;
> +
> +               ret = pll_set_rate(pll, rate_index, parent_rate);
> +               if (WARN_ON(ret))
> +                       goto err_clk_register;
> +       }
> +
> +       clk = clk_register(NULL, &pll->hw);
> +       if (WARN_ON(IS_ERR(clk)))
> +               goto err_clk_register;
> +
> +       pll->clk_data.clk_num = 1;
> +       pll->clk_data.clks = &clk;
> +
> +       ret = of_clk_add_provider(node, of_clk_src_onecell_get,
> +                       &pll->clk_data);
> +       if (WARN_ON(ret))
> +               goto err_clk_add;
> +
> +       return;
> +
> +err_clk_add:
> +       clk_unregister(clk);
> +err_clk_register:
> +       if (pll->asiu_base)
> +               iounmap(pll->asiu_base);
> +err_asiu_iomap:
> +       iounmap(pll->pwr_base);
> +err_pwr_iomap:
> +       iounmap(pll->pll_base);
> +err_pll_iomap:
> +       kfree(pll);
> +}
> diff --git a/drivers/clk/bcm/clk-iproc.h b/drivers/clk/bcm/clk-iproc.h
> new file mode 100644
> index 0000000..4aa0479
> --- /dev/null
> +++ b/drivers/clk/bcm/clk-iproc.h
> @@ -0,0 +1,155 @@
> +/*
> + * Copyright (C) 2014 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef _CLK_IPROC_H
> +#define _CLK_IPROC_H
> +
> +#include <linux/kernel.h>
> +#include <linux/list.h>
> +#include <linux/spinlock.h>
> +#include <linux/slab.h>
> +#include <linux/device.h>
> +#include <linux/of.h>
> +#include <linux/clk-provider.h>
> +
> +#define IPROC_CLK_NAME_LEN 25
> +#define IPROC_CLK_INVALID_OFFSET 0xffffffff
> +#define bit_mask(width) ((1 << (width)) - 1)
> +
> +/* clock should not be disabled at runtime */
> +#define IPROC_CLK_AON BIT(0)
> +
> +/* PLL requires gating through ASIU */
> +#define IPROC_CLK_PLL_ASIU BIT(1)
> +
> +/* PLL has fractional part of the NDIV */
> +#define IPROC_CLK_PLL_HAS_NDIV_FRAC BIT(2)
> +
> +/*
> + * Parameters for VCO frequency configuration
> + *
> + * VCO frequency =
> + * ((ndiv_int + ndiv_frac / 2^20) * (ref freqeuncy  / pdiv)
> + */
> +struct iproc_pll_vco_freq_param {
> +       unsigned long rate;
> +       unsigned int ndiv_int;
> +       unsigned int ndiv_frac;
> +       unsigned int pdiv;
> +};
> +
> +struct iproc_clk_reg_op {
> +       unsigned int offset;
> +       unsigned int shift;
> +       unsigned int width;
> +};
> +
> +/*
> + * Clock gating control at the top ASIU level
> + */
> +struct iproc_asiu_gate {
> +       unsigned int offset;
> +       unsigned int en_shift;
> +};
> +
> +/*
> + * Control of powering on/off of a PLL
> + *
> + * Before powering off a PLL, input isolation (ISO) needs to be enabled
> + */
> +struct iproc_pll_aon_pwr_ctrl {
> +       unsigned int offset;
> +       unsigned int pwr_width;
> +       unsigned int pwr_shift;
> +       unsigned int iso_shift;
> +};
> +
> +/*
> + * Control of the PLL reset, with Ki, Kp, and Ka parameters
> + */
> +struct iproc_pll_reset_ctrl {
> +       unsigned int offset;
> +       unsigned int reset_shift;
> +       unsigned int p_reset_shift;
> +       unsigned int ki_shift;
> +       unsigned int ki_width;
> +       unsigned int kp_shift;
> +       unsigned int kp_width;
> +       unsigned int ka_shift;
> +       unsigned int ka_width;
> +};
> +
> +struct iproc_pll_vco_ctrl {
> +       unsigned int u_offset;
> +       unsigned int l_offset;
> +};
> +
> +/*
> + * Main PLL control parameters
> + */
> +struct iproc_pll_ctrl {
> +       unsigned long flags;
> +       struct iproc_pll_aon_pwr_ctrl aon;
> +       struct iproc_asiu_gate asiu;
> +       struct iproc_pll_reset_ctrl reset;
> +       struct iproc_clk_reg_op ndiv_int;
> +       struct iproc_clk_reg_op ndiv_frac;
> +       struct iproc_clk_reg_op pdiv;
> +       struct iproc_pll_vco_ctrl vco_ctrl;
> +       struct iproc_clk_reg_op status;
> +};
> +
> +/*
> + * Controls enabling/disabling a PLL derived clock
> + */
> +struct iproc_clk_enable_ctrl {
> +       unsigned int offset;
> +       unsigned int enable_shift;
> +       unsigned int hold_shift;
> +       unsigned int bypass_shift;
> +};
> +
> +/*
> + * Main clock control parameters for clocks derived from the PLLs
> + */
> +struct iproc_clk_ctrl {
> +       unsigned int channel;
> +       unsigned long flags;
> +       struct iproc_clk_enable_ctrl enable;
> +       struct iproc_clk_reg_op mdiv;
> +};
> +
> +/*
> + * Divisor of the ASIU clocks
> + */
> +struct iproc_asiu_div {
> +       unsigned int offset;
> +       unsigned int en_shift;
> +       unsigned int high_shift;
> +       unsigned int high_width;
> +       unsigned int low_shift;
> +       unsigned int low_width;
> +};
> +
> +extern void __init iproc_armpll_setup(struct device_node *node);
> +extern void __init iproc_pll_setup(struct device_node *node,
> +               const struct iproc_pll_ctrl *ctrl,
> +               const struct iproc_pll_vco_freq_param *vco_param,
> +               unsigned int num_freqs);
> +extern void __init iproc_clk_setup(struct device_node *node,
> +               const struct iproc_clk_ctrl *ctrl, unsigned int num_clks);
> +extern void __init iproc_asiu_setup(struct device_node *node,
> +               const struct iproc_asiu_div *div,
> +               const struct iproc_asiu_gate *gate, unsigned int num_clks);
> +
> +#endif /* _CLK_IPROC_H */
> --
> 1.7.9.5
>
>
> _______________________________________________
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[PATCH 2/4] clk: iproc: add initial common clock support

[Tim Kryger]

On Thu, Dec 4, 2014 at 1:43 PM, Ray Jui <rjui@broadcom.com> wrote:
> This adds basic and generic support for various iProc PLLs and clocks
> including the ARMPLL, GENPLL, LCPLL, MIPIPLL, and ASIU clocks.
>
> SoCs under the iProc architecture can define their specific register
> offsets and clock parameters for their PLL and clock controllers. These
> parameters can be passed as arugments into the generic iProc PLL and
> clock setup functions
>
> Derived from code originally provided by Jonathan Richardson
> <jonathar@broadcom.com>
>
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> ---
>  drivers/clk/Makefile               |    2 +-
>  drivers/clk/bcm/Kconfig            |    9 +
>  drivers/clk/bcm/Makefile           |    1 +
>  drivers/clk/bcm/clk-iproc-armpll.c |  286 +++++++++++++++++++++
>  drivers/clk/bcm/clk-iproc-asiu.c   |  275 ++++++++++++++++++++
>  drivers/clk/bcm/clk-iproc-clk.c    |  238 ++++++++++++++++++
>  drivers/clk/bcm/clk-iproc-pll.c    |  483 ++++++++++++++++++++++++++++++++++++
>  drivers/clk/bcm/clk-iproc.h        |  155 ++++++++++++
>  8 files changed, 1448 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
>  create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
>  create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
>  create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
>  create mode 100644 drivers/clk/bcm/clk-iproc.h
>
> diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
> index d5fba5b..eff0213 100644
> --- a/drivers/clk/Makefile
> +++ b/drivers/clk/Makefile
> @@ -41,7 +41,7 @@ obj-$(CONFIG_ARCH_VT8500)             += clk-vt8500.o
>  obj-$(CONFIG_COMMON_CLK_WM831X)                += clk-wm831x.o
>  obj-$(CONFIG_COMMON_CLK_XGENE)         += clk-xgene.o
>  obj-$(CONFIG_COMMON_CLK_AT91)          += at91/
> -obj-$(CONFIG_ARCH_BCM_MOBILE)          += bcm/
> +obj-$(CONFIG_ARCH_BCM)                 += bcm/
>  obj-$(CONFIG_ARCH_BERLIN)              += berlin/
>  obj-$(CONFIG_ARCH_HI3xxx)              += hisilicon/
>  obj-$(CONFIG_ARCH_HIP04)               += hisilicon/

It may be best to move the above change into its own commit.

> diff --git a/drivers/clk/bcm/Kconfig b/drivers/clk/bcm/Kconfig
> index 75506e5..66b5b7f 100644
> --- a/drivers/clk/bcm/Kconfig
> +++ b/drivers/clk/bcm/Kconfig
> @@ -7,3 +7,12 @@ config CLK_BCM_KONA
>           Enable common clock framework support for Broadcom SoCs
>           using "Kona" style clock control units, including those
>           in the BCM281xx and BCM21664 families.
> +
> +config COMMON_CLK_IPROC
> +       bool "Broadcom iProc clock support"
> +       depends on ARCH_BCM_IPROC
> +       depends on COMMON_CLK
> +       default y
> +       help
> +         Enable common clock framework support for Broadcom SoCs
> +         based on the "iProc" architecture
> diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
> index 6297d05..6926636 100644
> --- a/drivers/clk/bcm/Makefile
> +++ b/drivers/clk/bcm/Makefile
> @@ -2,3 +2,4 @@ obj-$(CONFIG_CLK_BCM_KONA)      += clk-kona.o
>  obj-$(CONFIG_CLK_BCM_KONA)     += clk-kona-setup.o
>  obj-$(CONFIG_CLK_BCM_KONA)     += clk-bcm281xx.o
>  obj-$(CONFIG_CLK_BCM_KONA)     += clk-bcm21664.o
> +obj-$(CONFIG_COMMON_CLK_IPROC) += clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
> diff --git a/drivers/clk/bcm/clk-iproc-armpll.c b/drivers/clk/bcm/clk-iproc-armpll.c
> new file mode 100644
> index 0000000..ec9b130
> --- /dev/null
> +++ b/drivers/clk/bcm/clk-iproc-armpll.c
> @@ -0,0 +1,286 @@
> +/*
> + * Copyright (C) 2014 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/slab.h>
> +#include <linux/err.h>
> +#include <linux/clk-provider.h>
> +#include <linux/io.h>
> +#include <linux/of.h>
> +#include <linux/clkdev.h>
> +#include <linux/of_address.h>
> +
> +#define IPROC_CLK_MAX_FREQ_POLICY                    0x3
> +#define IPROC_CLK_POLICY_FREQ_OFFSET                 0x008
> +#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT      8
> +#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK       0x7
> +
> +#define IPROC_CLK_PLLARMA_OFFSET                     0xc00
> +#define IPROC_CLK_PLLARMA_LOCK_SHIFT                 28
> +#define IPROC_CLK_PLLARMA_PDIV_SHIFT                 24
> +#define IPROC_CLK_PLLARMA_PDIV_MASK                  0xf
> +#define IPROC_CLK_PLLARMA_NDIV_INT_SHIFT             8
> +#define IPROC_CLK_PLLARMA_NDIV_INT_MASK              0x3ff
> +
> +#define IPROC_CLK_PLLARMB_OFFSET                     0xc04
> +#define IPROC_CLK_PLLARMB_NDIV_FRAC_MASK             0xfffff
> +
> +#define IPROC_CLK_PLLARMC_OFFSET                     0xc08
> +#define IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT            8
> +#define IPROC_CLK_PLLARMC_MDIV_MASK                  0xff
> +
> +#define IPROC_CLK_PLLARMCTL5_OFFSET                  0xc20
> +#define IPROC_CLK_PLLARMCTL5_H_MDIV_MASK             0xff
> +
> +#define IPROC_CLK_PLLARM_OFFSET_OFFSET               0xc24
> +#define IPROC_CLK_PLLARM_SW_CTL_SHIFT                29
> +#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT       20
> +#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK        0xff
> +#define IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK       0xfffff
> +
> +#define IPROC_CLK_ARM_DIV_OFFSET                     0xe00
> +#define IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT  4
> +#define IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK        0xf
> +
> +#define IPROC_CLK_POLICY_DBG_OFFSET                  0xec0
> +#define IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT          12
> +#define IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK           0x7
> +
> +enum iproc_arm_pll_fid {
> +       ARM_PLL_FID_CRYSTAL_CLK   = 0,
> +       ARM_PLL_FID_SYS_CLK       = 2,
> +       ARM_PLL_FID_CH0_SLOW_CLK  = 6,
> +       ARM_PLL_FID_CH1_FAST_CLK  = 7
> +};
> +
> +struct iproc_arm_pll {
> +       struct clk_hw hw;
> +       void __iomem *base;
> +       struct clk_onecell_data clk_data;
> +       unsigned long rate;
> +};
> +
> +#define to_iproc_arm_pll(hw) container_of(hw, struct iproc_arm_pll, hw)
> +
> +static unsigned int __get_fid(struct iproc_arm_pll *pll)
> +{
> +       u32 val;
> +       unsigned int policy, fid, active_fid;
> +
> +       val = readl(pll->base + IPROC_CLK_ARM_DIV_OFFSET);
> +       if (val & (1 << IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT))
> +               policy = val & IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK;
> +       else
> +               policy = 0;
> +
> +       /* something is seriously wrong */
> +       BUG_ON(policy > IPROC_CLK_MAX_FREQ_POLICY);
> +
> +       val = readl(pll->base + IPROC_CLK_POLICY_FREQ_OFFSET);
> +       fid = (val >> (IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT * policy)) &
> +               IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK;
> +
> +       val = readl(pll->base + IPROC_CLK_POLICY_DBG_OFFSET);
> +       active_fid = IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK &
> +               (val >> IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT);
> +       if (fid != active_fid) {
> +               pr_debug("%s: fid override %u->%u\n", __func__, fid,
> +                               active_fid);
> +               fid = active_fid;
> +       }
> +
> +       pr_debug("%s: active fid: %u\n", __func__, fid);
> +
> +       return fid;
> +}
> +
> +/*
> + * Determine the mdiv (post divider) based on the frequency ID being used.
> + * There are 4 sources that can be used to derive the output clock rate:
> + *    - 25 MHz Crystal
> + *    - System clock
> + *    - PLL channel 0 (slow clock)
> + *    - PLL channel 1 (fast clock)
> + */
> +static int __get_mdiv(struct iproc_arm_pll *pll)
> +{
> +       unsigned int fid;
> +       int mdiv;
> +       u32 val;
> +
> +       fid = __get_fid(pll);
> +
> +       switch (fid) {
> +       case ARM_PLL_FID_CRYSTAL_CLK:
> +       case ARM_PLL_FID_SYS_CLK:
> +               mdiv = 1;
> +               break;
> +
> +       case ARM_PLL_FID_CH0_SLOW_CLK:
> +               val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
> +               mdiv = val & IPROC_CLK_PLLARMC_MDIV_MASK;
> +               if (mdiv == 0)
> +                       mdiv = 256;
> +               break;
> +
> +       case ARM_PLL_FID_CH1_FAST_CLK:
> +               val = readl(pll->base + IPROC_CLK_PLLARMCTL5_OFFSET);
> +               mdiv = val & IPROC_CLK_PLLARMCTL5_H_MDIV_MASK;
> +               if (mdiv == 0)
> +                       mdiv = 256;
> +               break;
> +
> +       default:
> +               mdiv = -EFAULT;
> +       }
> +
> +       return mdiv;
> +}
> +
> +static unsigned int __get_ndiv(struct iproc_arm_pll *pll)
> +{
> +       u32 val;
> +       unsigned int ndiv_int, ndiv_frac, ndiv;
> +
> +       val = readl(pll->base + IPROC_CLK_PLLARM_OFFSET_OFFSET);
> +       if (val & (1 << IPROC_CLK_PLLARM_SW_CTL_SHIFT)) {
> +               /*
> +                * offset mode is active. Read the ndiv from the PLLARM OFFSET
> +                * register
> +                */
> +               ndiv_int = (val >> IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT) &
> +                       IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK;
> +               if (ndiv_int == 0)
> +                       ndiv_int = 256;
> +
> +               ndiv_frac = val & IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK;
> +       } else {
> +               /* offset mode not active */
> +               val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
> +               ndiv_int = (val >> IPROC_CLK_PLLARMA_NDIV_INT_SHIFT) &
> +                       IPROC_CLK_PLLARMA_NDIV_INT_MASK;
> +               if (ndiv_int == 0)
> +                       ndiv_int = 1024;
> +
> +               val = readl(pll->base + IPROC_CLK_PLLARMB_OFFSET);
> +               ndiv_frac = val & IPROC_CLK_PLLARMB_NDIV_FRAC_MASK;
> +       }
> +
> +       ndiv = (ndiv_int << 20) | ndiv_frac;
> +
> +       return ndiv;
> +}
> +
> +/*
> + * The output frequency of the ARM PLL is calculated based on the ARM PLL
> + * divider values:
> + *   pdiv = ARM PLL pre-divider
> + *   ndiv = ARM PLL multiplier
> + *   mdiv = ARM PLL post divider
> + *
> + * The frequency is calculated by:
> + *   ((ndiv * parent clock rate) / pdiv) / mdiv
> + */
> +static unsigned long iproc_arm_pll_recalc_rate(struct clk_hw *hw,
> +               unsigned long parent_rate)
> +{
> +       struct iproc_arm_pll *pll = to_iproc_arm_pll(hw);
> +       u32 val;
> +       int mdiv;
> +       u64 ndiv;
> +       unsigned int pdiv;
> +
> +       /* in bypass mode, use parent rate */
> +       val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
> +       if (val & (1 << IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT)) {
> +               pll->rate = parent_rate;
> +               return pll->rate;
> +       }
> +
> +       /* PLL needs to be locked */
> +       val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
> +       if (!(val & (1 << IPROC_CLK_PLLARMA_LOCK_SHIFT))) {
> +               pll->rate = 0;
> +               return 0;
> +       }
> +
> +       pdiv = (val >> IPROC_CLK_PLLARMA_PDIV_SHIFT) &
> +               IPROC_CLK_PLLARMA_PDIV_MASK;
> +       if (pdiv == 0)
> +               pdiv = 16;
> +
> +       ndiv = __get_ndiv(pll);
> +       mdiv = __get_mdiv(pll);
> +       if (mdiv <= 0) {
> +               pll->rate = 0;
> +               return 0;
> +       }
> +       pll->rate = (ndiv * parent_rate) >> 20;
> +       pll->rate = (pll->rate / pdiv) / mdiv;
> +
> +       pr_debug("%s: ARM PLL rate: %lu. parent rate: %lu\n", __func__,
> +                       pll->rate, parent_rate);
> +       pr_debug("%s: ndiv_int: %u, pdiv: %u, mdiv: %d\n", __func__,
> +                       (unsigned int)(ndiv >> 20), pdiv, mdiv);
> +
> +       return pll->rate;
> +}
> +
> +static const struct clk_ops iproc_arm_pll_ops = {
> +       .recalc_rate = iproc_arm_pll_recalc_rate,
> +};
> +
> +void __init iproc_armpll_setup(struct device_node *node)
> +{
> +       int ret;
> +       struct clk *clk;
> +       struct iproc_arm_pll *pll;
> +       struct clk_init_data init;
> +       const char *parent_name;
> +
> +       pll = kzalloc(sizeof(*pll), GFP_KERNEL);
> +       if (WARN_ON(!pll))
> +               return;
> +
> +       pll->base = of_iomap(node, 0);
> +       if (WARN_ON(!pll->base))
> +               goto err_free_pll;
> +
> +       init.name = node->name;
> +       init.ops = &iproc_arm_pll_ops;
> +       init.flags = 0;
> +       parent_name = of_clk_get_parent_name(node, 0);
> +       init.parent_names = (parent_name ? &parent_name : NULL);
> +       init.num_parents = (parent_name ? 1 : 0);
> +       pll->hw.init = &init;
> +
> +       clk = clk_register(NULL, &pll->hw);
> +       if (WARN_ON(IS_ERR(clk)))
> +               goto err_iounmap;
> +
> +       pll->clk_data.clk_num = 1;
> +       pll->clk_data.clks = &clk;
> +
> +       ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
> +       if (WARN_ON(ret))
> +               goto err_clk_unregister;
> +
> +       return;
> +
> +err_clk_unregister:
> +       clk_unregister(clk);
> +err_iounmap:
> +       iounmap(pll->base);
> +err_free_pll:
> +       kfree(pll);
> +}
> diff --git a/drivers/clk/bcm/clk-iproc-asiu.c b/drivers/clk/bcm/clk-iproc-asiu.c
> new file mode 100644
> index 0000000..ab86b8c
> --- /dev/null
> +++ b/drivers/clk/bcm/clk-iproc-asiu.c
> @@ -0,0 +1,275 @@
> +/*
> + * Copyright (C) 2014 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/err.h>
> +#include <linux/clk-provider.h>
> +#include <linux/io.h>
> +#include <linux/of.h>
> +#include <linux/clkdev.h>
> +#include <linux/of_address.h>
> +#include <linux/delay.h>
> +
> +#include "clk-iproc.h"
> +
> +struct iproc_asiu;
> +
> +struct iproc_asiu_clk {
> +       struct clk_hw hw;
> +       const char *name;
> +       struct iproc_asiu *asiu;
> +       unsigned long rate;
> +       struct iproc_asiu_div div;
> +       struct iproc_asiu_gate gate;
> +};
> +
> +struct iproc_asiu {
> +       void __iomem *div_base;
> +       void __iomem *gate_base;
> +
> +       struct clk_onecell_data clk_data;
> +       struct iproc_asiu_clk *clks;
> +};
> +
> +#define to_asiu_clk(hw) container_of(hw, struct iproc_asiu_clk, hw)
> +
> +static int iproc_asiu_clk_enable(struct clk_hw *hw)
> +{
> +       struct iproc_asiu_clk *clk = to_asiu_clk(hw);
> +       struct iproc_asiu *asiu = clk->asiu;
> +       u32 val;
> +
> +       /* some clocks at the ASIU level are always enabled */
> +       if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
> +               return 0;
> +
> +       val = readl(asiu->gate_base + clk->gate.offset);
> +       val |= (1 << clk->gate.en_shift);
> +       writel(val, asiu->gate_base + clk->gate.offset);
> +
> +       return 0;
> +}
> +
> +static void iproc_asiu_clk_disable(struct clk_hw *hw)
> +{
> +       struct iproc_asiu_clk *clk = to_asiu_clk(hw);
> +       struct iproc_asiu *asiu = clk->asiu;
> +       u32 val;
> +
> +       /* some clocks at the ASIU level are always enabled */
> +       if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
> +               return;
> +
> +       val = readl(asiu->gate_base + clk->gate.offset);
> +       val &= ~(1 << clk->gate.en_shift);
> +       writel(val, asiu->gate_base + clk->gate.offset);
> +}
> +
> +static unsigned long iproc_asiu_clk_recalc_rate(struct clk_hw *hw,
> +               unsigned long parent_rate)
> +{
> +       struct iproc_asiu_clk *clk = to_asiu_clk(hw);
> +       struct iproc_asiu *asiu = clk->asiu;
> +       u32 val;
> +       unsigned int div_h, div_l;
> +
> +       if (parent_rate == 0) {
> +               clk->rate = 0;
> +               return 0;
> +       }
> +
> +       /* if clock divisor is not enabled, simply return parent rate */
> +       val = readl(asiu->div_base + clk->div.offset);
> +       if ((val & (1 << clk->div.en_shift)) == 0) {
> +               clk->rate = parent_rate;
> +               return parent_rate;
> +       }
> +
> +       /* clock rate = parent rate / (high_div + 1) + (low_div + 1) */
> +       div_h = (val >> clk->div.high_shift) & bit_mask(clk->div.high_width);
> +       div_h++;
> +       div_l = (val >> clk->div.low_shift) & bit_mask(clk->div.low_width);
> +       div_l++;
> +
> +       clk->rate = parent_rate / (div_h + div_l);
> +       pr_debug("%s: rate: %lu. parent rate: %lu div_h: %u div_l: %u\n",
> +               __func__, clk->rate, parent_rate, div_h, div_l);
> +
> +       return clk->rate;
> +}
> +
> +static long iproc_asiu_clk_round_rate(struct clk_hw *hw, unsigned long rate,
> +               unsigned long *parent_rate)
> +{
> +       unsigned int div;
> +
> +       if (rate == 0 || *parent_rate == 0)
> +               return -EINVAL;
> +
> +       if (rate == *parent_rate)
> +               return *parent_rate;
> +
> +       div = DIV_ROUND_UP(*parent_rate, rate);
> +       if (div < 2)
> +               return *parent_rate;
> +
> +       return *parent_rate / div;
> +}
> +
> +static int iproc_asiu_clk_set_rate(struct clk_hw *hw, unsigned long rate,
> +               unsigned long parent_rate)
> +{
> +       struct iproc_asiu_clk *clk = to_asiu_clk(hw);
> +       struct iproc_asiu *asiu = clk->asiu;
> +       unsigned int div, div_h, div_l;
> +       u32 val;
> +
> +       if (rate == 0 || parent_rate == 0)
> +               return -EINVAL;
> +
> +       /* simply disable the divisor if one wants the same rate as parent */
> +       if (rate == parent_rate) {
> +               val = readl(asiu->div_base + clk->div.offset);
> +               val &= ~(1 << clk->div.en_shift);
> +               writel(val, asiu->div_base + clk->div.offset);
> +               return 0;
> +       }
> +
> +       div = DIV_ROUND_UP(parent_rate, rate);
> +       if (div < 2)
> +               return -EINVAL;
> +
> +       div_h = div_l = div >> 1;
> +       div_h--;
> +       div_l--;
> +
> +       val = readl(asiu->div_base + clk->div.offset);
> +       val |= 1 << clk->div.en_shift;
> +       if (div_h) {
> +               val &= ~(bit_mask(clk->div.high_width)
> +                               << clk->div.high_shift);
> +               val |= div_h << clk->div.high_shift;
> +       } else {
> +               val &= ~(bit_mask(clk->div.high_width)
> +                               << clk->div.high_shift);
> +       }
> +       if (div_l) {
> +               val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
> +               val |= div_l << clk->div.low_shift;
> +       } else {
> +               val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
> +       }
> +       writel(val, asiu->div_base + clk->div.offset);
> +
> +       return 0;
> +}
> +
> +static const struct clk_ops iproc_asiu_ops = {
> +       .enable = iproc_asiu_clk_enable,
> +       .disable = iproc_asiu_clk_disable,
> +       .recalc_rate = iproc_asiu_clk_recalc_rate,
> +       .round_rate = iproc_asiu_clk_round_rate,
> +       .set_rate = iproc_asiu_clk_set_rate,
> +};
> +
> +void __init iproc_asiu_setup(struct device_node *node,
> +               const struct iproc_asiu_div *div,
> +               const struct iproc_asiu_gate *gate, unsigned int num_clks)
> +{
> +       int i, ret;
> +       struct iproc_asiu *asiu;
> +
> +       if (WARN_ON(!gate || !div))
> +               return;
> +
> +       asiu = kzalloc(sizeof(*asiu), GFP_KERNEL);
> +       if (WARN_ON(!asiu))
> +               return;
> +
> +       asiu->clk_data.clk_num = num_clks;
> +       asiu->clk_data.clks = kcalloc(num_clks, sizeof(*asiu->clk_data.clks),
> +                       GFP_KERNEL);
> +       if (WARN_ON(!asiu->clk_data.clks))
> +               goto err_clks;
> +
> +       asiu->clks = kcalloc(num_clks, sizeof(*asiu->clks), GFP_KERNEL);
> +       if (WARN_ON(!asiu->clks))
> +               goto err_asiu_clks;
> +
> +       asiu->div_base = of_iomap(node, 0);
> +       if (WARN_ON(!asiu->div_base))
> +               goto err_iomap_div;
> +
> +       asiu->gate_base = of_iomap(node, 1);
> +       if (WARN_ON(!asiu->gate_base))
> +               goto err_iomap_gate;
> +
> +       for (i = 0; i < num_clks; i++) {
> +               struct clk_init_data init;
> +               struct clk *clk;
> +               const char *parent_name;
> +               struct iproc_asiu_clk *asiu_clk;
> +               const char *clk_name;
> +
> +               clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
> +               if (WARN_ON(!clk_name))
> +                       goto err_clk_register;
> +
> +               ret = of_property_read_string_index(node, "clock-output-names",
> +                               i, &clk_name);
> +               if (WARN_ON(ret))
> +                       goto err_clk_register;
> +
> +               asiu_clk = &asiu->clks[i];
> +               asiu_clk->name = clk_name;
> +               asiu_clk->asiu = asiu;
> +               asiu_clk->div = div[i];
> +               asiu_clk->gate = gate[i];
> +               init.name = clk_name;
> +               init.ops = &iproc_asiu_ops;
> +               init.flags = 0;
> +               parent_name = of_clk_get_parent_name(node, 0);
> +               init.parent_names = (parent_name ? &parent_name : NULL);
> +               init.num_parents = (parent_name ? 1 : 0);
> +               asiu_clk->hw.init = &init;
> +
> +               clk = clk_register(NULL, &asiu_clk->hw);
> +               if (WARN_ON(IS_ERR(clk)))
> +                       goto err_clk_register;
> +               asiu->clk_data.clks[i] = clk;
> +       }
> +
> +       ret = of_clk_add_provider(node, of_clk_src_onecell_get,
> +                       &asiu->clk_data);
> +       if (WARN_ON(ret))
> +               goto err_clk_register;
> +
> +       return;
> +
> +err_clk_register:
> +       for (i = 0; i < num_clks; i++)
> +               kfree(asiu->clks[i].name);
> +       iounmap(asiu->gate_base);
> +
> +err_iomap_gate:
> +       iounmap(asiu->div_base);
> +
> +err_iomap_div:
> +       kfree(asiu->clks);
> +
> +err_asiu_clks:
> +       kfree(asiu->clk_data.clks);
> +
> +err_clks:
> +       kfree(asiu);
> +}
> diff --git a/drivers/clk/bcm/clk-iproc-clk.c b/drivers/clk/bcm/clk-iproc-clk.c
> new file mode 100644
> index 0000000..be3c42c
> --- /dev/null
> +++ b/drivers/clk/bcm/clk-iproc-clk.c
> @@ -0,0 +1,238 @@
> +/*
> + * Copyright (C) 2014 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/err.h>
> +#include <linux/clk-provider.h>
> +#include <linux/io.h>
> +#include <linux/of.h>
> +#include <linux/clkdev.h>
> +#include <linux/of_address.h>
> +#include <linux/delay.h>
> +
> +#include "clk-iproc.h"
> +
> +struct iproc_pll;
> +
> +struct iproc_clk {
> +       struct clk_hw hw;
> +       const char *name;
> +       struct iproc_pll *pll;
> +       unsigned long rate;
> +       const struct iproc_clk_ctrl *ctrl;
> +};
> +
> +struct iproc_pll {
> +       void __iomem *base;
> +       struct clk_onecell_data clk_data;
> +       struct iproc_clk *clks;
> +};
> +
> +#define to_iproc_clk(hw) container_of(hw, struct iproc_clk, hw)
> +
> +static int iproc_clk_enable(struct clk_hw *hw)
> +{
> +       struct iproc_clk *clk = to_iproc_clk(hw);
> +       const struct iproc_clk_ctrl *ctrl = clk->ctrl;
> +       struct iproc_pll *pll = clk->pll;
> +       u32 val;
> +
> +       /* channel enable is active low */
> +       val = readl(pll->base + ctrl->enable.offset);
> +       val &= ~(1 << ctrl->enable.enable_shift);
> +       writel(val, pll->base + ctrl->enable.offset);
> +
> +       /* also make sure channel is not held */
> +       val = readl(pll->base + ctrl->enable.offset);
> +       val &= ~(1 << ctrl->enable.hold_shift);
> +       writel(val, pll->base + ctrl->enable.offset);
> +
> +       return 0;
> +}
> +
> +static void iproc_clk_disable(struct clk_hw *hw)
> +{
> +       struct iproc_clk *clk = to_iproc_clk(hw);
> +       const struct iproc_clk_ctrl *ctrl = clk->ctrl;
> +       struct iproc_pll *pll = clk->pll;
> +       u32 val;
> +
> +       if (ctrl->flags & IPROC_CLK_AON)
> +               return;
> +
> +       val = readl(pll->base + ctrl->enable.offset);
> +       val |= 1 << ctrl->enable.enable_shift;
> +       writel(val, pll->base + ctrl->enable.offset);
> +}
> +
> +static unsigned long iproc_clk_recalc_rate(struct clk_hw *hw,
> +               unsigned long parent_rate)
> +{
> +       struct iproc_clk *clk = to_iproc_clk(hw);
> +       const struct iproc_clk_ctrl *ctrl = clk->ctrl;
> +       struct iproc_pll *pll = clk->pll;
> +       u32 val;
> +       unsigned int mdiv;
> +
> +       if (parent_rate == 0)
> +               return 0;
> +
> +       val = readl(pll->base + ctrl->mdiv.offset);
> +       mdiv = (val >> ctrl->mdiv.shift) & bit_mask(ctrl->mdiv.width);
> +       if (mdiv == 0)
> +               mdiv = 256;
> +
> +       clk->rate = parent_rate / mdiv;
> +
> +       return clk->rate;
> +}
> +
> +static long iproc_clk_round_rate(struct clk_hw *hw, unsigned long rate,
> +               unsigned long *parent_rate)
> +{
> +       unsigned int div;
> +
> +       if (rate == 0 || *parent_rate == 0)
> +               return -EINVAL;
> +
> +       if (rate == *parent_rate)
> +               return *parent_rate;
> +
> +       div = DIV_ROUND_UP(*parent_rate, rate);
> +       if (div < 2)
> +               return *parent_rate;
> +
> +       if (div > 256)
> +               div = 256;
> +
> +       return *parent_rate / div;
> +}
> +
> +static int iproc_clk_set_rate(struct clk_hw *hw, unsigned long rate,
> +               unsigned long parent_rate)
> +{
> +       struct iproc_clk *clk = to_iproc_clk(hw);
> +       const struct iproc_clk_ctrl *ctrl = clk->ctrl;
> +       struct iproc_pll *pll = clk->pll;
> +       u32 val;
> +       unsigned int div;
> +
> +       if (rate == 0 || parent_rate == 0)
> +               return -EINVAL;
> +
> +       div = DIV_ROUND_UP(parent_rate, rate);
> +       if (div > 256)
> +               return -EINVAL;
> +
> +       val = readl(pll->base + ctrl->mdiv.offset);
> +       if (div == 256) {
> +               val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
> +       } else {
> +               val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
> +               val |= div << ctrl->mdiv.shift;
> +       }
> +       writel(val, pll->base + ctrl->mdiv.offset);
> +       clk->rate = parent_rate / div;
> +
> +       return 0;
> +}
> +
> +static const struct clk_ops iproc_clk_ops = {
> +       .enable = iproc_clk_enable,
> +       .disable = iproc_clk_disable,
> +       .recalc_rate = iproc_clk_recalc_rate,
> +       .round_rate = iproc_clk_round_rate,
> +       .set_rate = iproc_clk_set_rate,
> +};
> +
> +void __init iproc_clk_setup(struct device_node *node,
> +               const struct iproc_clk_ctrl *ctrl, unsigned int num_clks)
> +{
> +       int i, ret;
> +       struct iproc_pll *pll;
> +
> +       if (WARN_ON(!ctrl))
> +               return;
> +
> +       pll = kzalloc(sizeof(*pll), GFP_KERNEL);
> +       if (WARN_ON(!pll))
> +               return;
> +
> +       pll->clk_data.clk_num = num_clks;
> +       pll->clk_data.clks = kcalloc(num_clks, sizeof(*pll->clk_data.clks),
> +                       GFP_KERNEL);
> +       if (WARN_ON(!pll->clk_data.clks))
> +               goto err_clks;
> +
> +       pll->clks = kcalloc(num_clks, sizeof(*pll->clks), GFP_KERNEL);
> +       if (WARN_ON(!pll->clks))
> +               goto err_pll_clks;
> +
> +       pll->base = of_iomap(node, 0);
> +       if (WARN_ON(!pll->base))
> +               goto err_iomap;
> +
> +       for (i = 0; i < num_clks; i++) {
> +               struct clk_init_data init;
> +               struct clk *clk;
> +               const char *parent_name;
> +               struct iproc_clk *iclk;
> +               const char *clk_name;
> +
> +               clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
> +               if (WARN_ON(!clk_name))
> +                       goto err_clk_register;
> +
> +               ret = of_property_read_string_index(node, "clock-output-names",
> +                               i, &clk_name);
> +               if (WARN_ON(ret))
> +                       goto err_clk_register;
> +
> +               iclk = &pll->clks[i];
> +               iclk->name = clk_name;
> +               iclk->pll = pll;
> +               iclk->ctrl = &ctrl[i];
> +               init.name = clk_name;
> +               init.ops = &iproc_clk_ops;
> +               init.flags = 0;
> +               parent_name = of_clk_get_parent_name(node, 0);
> +               init.parent_names = (parent_name ? &parent_name : NULL);
> +               init.num_parents = (parent_name ? 1 : 0);
> +               iclk->hw.init = &init;
> +
> +               clk = clk_register(NULL, &iclk->hw);
> +               if (WARN_ON(IS_ERR(clk)))
> +                       goto err_clk_register;
> +               pll->clk_data.clks[i] = clk;
> +       }
> +
> +       ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
> +       if (WARN_ON(ret))
> +               goto err_clk_register;
> +
> +       return;
> +
> +err_clk_register:
> +       for (i = 0; i < num_clks; i++)
> +               kfree(pll->clks[i].name);
> +       iounmap(pll->base);
> +
> +err_iomap:
> +       kfree(pll->clks);
> +
> +err_pll_clks:
> +       kfree(pll->clk_data.clks);
> +
> +err_clks:
> +       kfree(pll);
> +}
> diff --git a/drivers/clk/bcm/clk-iproc-pll.c b/drivers/clk/bcm/clk-iproc-pll.c
> new file mode 100644
> index 0000000..cd3bd38
> --- /dev/null
> +++ b/drivers/clk/bcm/clk-iproc-pll.c
> @@ -0,0 +1,483 @@
> +/*
> + * Copyright (C) 2014 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/err.h>
> +#include <linux/clk-provider.h>
> +#include <linux/io.h>
> +#include <linux/of.h>
> +#include <linux/clkdev.h>
> +#include <linux/of_address.h>
> +#include <linux/delay.h>
> +
> +#include "clk-iproc.h"
> +
> +#define PLL_VCO_HIGH_SHIFT 19
> +#define PLL_VCO_LOW_SHIFT  30
> +
> +/* number of delay loops waiting for PLL to lock */
> +#define LOCK_DELAY 100
> +
> +/* number of VCO frequency bands */
> +#define NUM_FREQ_BANDS 8
> +
> +#define NUM_KP_BANDS 3
> +enum kp_band {
> +       KP_BAND_MID = 0,
> +       KP_BAND_HIGH,
> +       KP_BAND_HIGH_HIGH
> +};
> +
> +static const unsigned int kp_table[NUM_KP_BANDS][NUM_FREQ_BANDS] = {
> +       { 5, 6, 6, 7, 7, 8, 9, 10 },
> +       { 4, 4, 5, 5, 6, 7, 8, 9  },
> +       { 4, 5, 5, 6, 7, 8, 9, 10 },
> +};
> +
> +static const unsigned long ref_freq_table[NUM_FREQ_BANDS][2] = {
> +       { 10000000,  12500000  },
> +       { 12500000,  15000000  },
> +       { 15000000,  20000000  },
> +       { 20000000,  25000000  },
> +       { 25000000,  50000000  },
> +       { 50000000,  75000000  },
> +       { 75000000,  100000000 },
> +       { 100000000, 125000000 },
> +};
> +
> +enum vco_freq_range {
> +       VCO_LOW       = 700000000U,
> +       VCO_MID       = 1200000000U,
> +       VCO_HIGH      = 2200000000U,
> +       VCO_HIGH_HIGH = 3100000000U,
> +       VCO_MAX       = 4000000000U,
> +};
> +
> +struct iproc_pll {
> +       struct clk_hw hw;
> +       void __iomem *pll_base;
> +       void __iomem *pwr_base;
> +       void __iomem *asiu_base;
> +       struct clk_onecell_data clk_data;
> +       const char *name;
> +       const struct iproc_pll_ctrl *ctrl;
> +       const struct iproc_pll_vco_freq_param *vco_param;
> +       unsigned int num_vco_entries;
> +       unsigned long rate;
> +};
> +
> +#define to_iproc_pll(hw) container_of(hw, struct iproc_pll, hw)
> +
> +/*
> + * Get the clock rate based on name
> + */
> +static unsigned long __get_rate(const char *clk_name)
> +{
> +       struct clk *clk;
> +
> +       clk = __clk_lookup(clk_name);
> +       if (!clk) {
> +               pr_err("%s: unable to find clock by name: %s\n", __func__,
> +                               clk_name);
> +               return 0;
> +       }
> +
> +       return clk_get_rate(clk);
> +}
> +
> +/*
> + * Based on the target frequency, find a match from the VCO frequency parameter
> + * table and return its index
> + */
> +static int pll_get_rate_index(struct iproc_pll *pll, unsigned int target_rate)
> +{
> +       int i;
> +
> +       for (i = 0; i < pll->num_vco_entries; i++)
> +               if (target_rate == pll->vco_param[i].rate)
> +                       break;
> +
> +       if (i >= pll->num_vco_entries)
> +               return -EINVAL;
> +
> +       return i;
> +}
> +
> +static int get_kp(unsigned long ref_freq, enum kp_band kp_index)
> +{
> +       int i;
> +
> +       if (ref_freq < ref_freq_table[0][0])
> +               return -EINVAL;
> +
> +       for (i = 0; i < NUM_FREQ_BANDS; i++) {
> +               if (ref_freq >= ref_freq_table[i][0] &&
> +                       ref_freq < ref_freq_table[i][1])
> +                       return kp_table[kp_index][i];
> +       }
> +       return -EINVAL;
> +}
> +
> +static int pll_wait_for_lock(struct iproc_pll *pll)
> +{
> +       int i;
> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
> +
> +       for (i = 0; i < LOCK_DELAY; i++) {
> +               u32 val = readl(pll->pll_base + ctrl->status.offset);
> +
> +               if (val & (1 << ctrl->status.shift))
> +                       return 0;
> +               udelay(10);
> +       }
> +
> +       return -EIO;
> +}
> +
> +static void __pll_disable(struct iproc_pll *pll)
> +{
> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
> +       u32 val;
> +
> +       if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
> +               val = readl(pll->asiu_base + ctrl->asiu.offset);
> +               val &= ~(1 << ctrl->asiu.en_shift);
> +               writel(val, pll->asiu_base + ctrl->asiu.offset);
> +       }
> +
> +       /* latch input value so core power can be shut down */
> +       val = readl(pll->pwr_base + ctrl->aon.offset);
> +       val |= (1 << ctrl->aon.iso_shift);
> +       writel(val, pll->pwr_base + ctrl->aon.offset);
> +
> +       /* power down the core */
> +       val &= ~(bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift);
> +       writel(val, pll->pwr_base + ctrl->aon.offset);
> +}
> +
> +static int __pll_enable(struct iproc_pll *pll)
> +{
> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
> +       u32 val;
> +
> +       /* power up the PLL and make sure it's not latched */
> +       val = readl(pll->pwr_base + ctrl->aon.offset);
> +       val |= bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift;
> +       val &= ~(1 << ctrl->aon.iso_shift);
> +       writel(val, pll->pwr_base + ctrl->aon.offset);
> +
> +       /* certain PLLs also need to be ungated from the ASIU top level */
> +       if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
> +               val = readl(pll->asiu_base + ctrl->asiu.offset);
> +               val |= (1 << ctrl->asiu.en_shift);
> +               writel(val, pll->asiu_base + ctrl->asiu.offset);
> +       }
> +
> +       return 0;
> +}
> +
> +static void __pll_put_in_reset(struct iproc_pll *pll)
> +{
> +       u32 val;
> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
> +       const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
> +
> +       val = readl(pll->pll_base + reset->offset);
> +       val &= ~(1 << reset->reset_shift | 1 << reset->p_reset_shift);
> +       writel(val, pll->pll_base + reset->offset);
> +}
> +
> +static void __pll_bring_out_reset(struct iproc_pll *pll, unsigned int kp,
> +               unsigned int ka, unsigned int ki)
> +{
> +       u32 val;
> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
> +       const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
> +
> +       val = readl(pll->pll_base + reset->offset);
> +       val &= ~(bit_mask(reset->ki_width) << reset->ki_shift |
> +               bit_mask(reset->kp_width) << reset->kp_shift |
> +               bit_mask(reset->ka_width) << reset->ka_shift);
> +       val |=  ki << reset->ki_shift | kp << reset->kp_shift |
> +               ka << reset->ka_shift;
> +       val |= 1 << reset->reset_shift | 1 << reset->p_reset_shift;
> +       writel(val, pll->pll_base + reset->offset);
> +}
> +
> +static int pll_set_rate(struct iproc_pll *pll, unsigned int rate_index,
> +               unsigned long parent_rate)
> +{
> +       const struct iproc_pll_vco_freq_param *vco =
> +                               &pll->vco_param[rate_index];
> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
> +       int ka = 0, ki, kp, ret;
> +       unsigned long rate = vco->rate;
> +       u32 val;
> +       enum kp_band kp_index;
> +       unsigned long ref_freq;
> +
> +       /*
> +        * reference frequency = parent frequency / PDIV
> +        * If PDIV = 0, then it becomes a multiplier (x2)
> +        */
> +       if (vco->pdiv == 0)
> +               ref_freq = parent_rate * 2;
> +       else
> +               ref_freq = parent_rate / vco->pdiv;
> +
> +       /* determine Ki and Kp index based on target VCO frequency */
> +       if (rate >= VCO_LOW && rate < VCO_HIGH) {
> +               ki = 4;
> +               kp_index = KP_BAND_MID;
> +       } else if (rate >= VCO_HIGH && rate && rate < VCO_HIGH_HIGH) {
> +               ki = 3;
> +               kp_index = KP_BAND_HIGH;
> +       } else if (rate >= VCO_HIGH_HIGH && rate < VCO_MAX) {
> +               ki = 3;
> +               kp_index = KP_BAND_HIGH_HIGH;
> +       } else {
> +               pr_err("%s: pll: %s has invalid rate: %lu\n", __func__,
> +                               pll->name, rate);
> +               return -EINVAL;
> +       }
> +
> +       kp = get_kp(ref_freq, kp_index);
> +       if (kp < 0) {
> +               pr_err("%s: pll: %s has invalid kp\n", __func__, pll->name);
> +               return kp;
> +       }
> +
> +       ret = __pll_enable(pll);
> +       if (ret) {
> +               pr_err("%s: pll: %s fails to enable\n", __func__, pll->name);
> +               return ret;
> +       }
> +
> +       /* put PLL in reset */
> +       __pll_put_in_reset(pll);
> +
> +       writel(0, pll->pll_base + ctrl->vco_ctrl.u_offset);
> +       val = readl(pll->pll_base + ctrl->vco_ctrl.l_offset);
> +
> +       if (rate >= VCO_LOW && rate < VCO_MID)
> +               val |= (1 << PLL_VCO_LOW_SHIFT);
> +
> +       if (rate < VCO_HIGH)
> +               val &= ~(1 << PLL_VCO_HIGH_SHIFT);
> +       else
> +               val |= (1 << PLL_VCO_HIGH_SHIFT);
> +
> +       writel(val, pll->pll_base + ctrl->vco_ctrl.l_offset);
> +
> +       /* program integer part of NDIV */
> +       val = readl(pll->pll_base + ctrl->ndiv_int.offset);
> +       val &= ~(bit_mask(ctrl->ndiv_int.width) << ctrl->ndiv_int.shift);
> +       val |= vco->ndiv_int << ctrl->ndiv_int.shift;
> +       writel(val, pll->pll_base + ctrl->ndiv_int.offset);
> +
> +       /* program fractional part of NDIV */
> +       if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
> +               val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
> +               val &= ~(bit_mask(ctrl->ndiv_frac.width) <<
> +                               ctrl->ndiv_frac.shift);
> +               val |= vco->ndiv_frac << ctrl->ndiv_frac.shift;
> +               writel(val, pll->pll_base + ctrl->ndiv_frac.offset);
> +       }
> +
> +       /* program PDIV */
> +       val = readl(pll->pll_base + ctrl->pdiv.offset);
> +       val &= ~(bit_mask(ctrl->pdiv.width) << ctrl->pdiv.shift);
> +       val |= vco->pdiv << ctrl->pdiv.shift;
> +       writel(val, pll->pll_base + ctrl->pdiv.offset);
> +
> +       __pll_bring_out_reset(pll, kp, ka, ki);
> +
> +       ret = pll_wait_for_lock(pll);
> +       if (ret < 0) {
> +               pr_err("%s: pll: %s failed to lock\n", __func__, pll->name);
> +               return ret;
> +       }
> +
> +       return 0;
> +}
> +
> +static int iproc_pll_enable(struct clk_hw *hw)
> +{
> +       struct iproc_pll *pll = to_iproc_pll(hw);
> +
> +       return __pll_enable(pll);
> +}
> +
> +static void iproc_pll_disable(struct clk_hw *hw)
> +{
> +       struct iproc_pll *pll = to_iproc_pll(hw);
> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
> +
> +       if (ctrl->flags & IPROC_CLK_AON)
> +               return;
> +
> +       __pll_disable(pll);
> +}
> +
> +static unsigned long iproc_pll_recalc_rate(struct clk_hw *hw,
> +       unsigned long parent_rate)
> +{
> +       struct iproc_pll *pll = to_iproc_pll(hw);
> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
> +       u32 val;
> +       u64 ndiv;
> +       unsigned int ndiv_int, ndiv_frac, pdiv;
> +
> +       if (parent_rate == 0)
> +               return 0;
> +
> +       /* PLL needs to be locked */
> +       val = readl(pll->pll_base + ctrl->status.offset);
> +       if ((val & (1 << ctrl->status.shift)) == 0) {
> +               pll->rate = 0;
> +               return 0;
> +       }
> +
> +       /*
> +        * PLL output frequency =
> +        *
> +        * ((ndiv_int + ndiv_frac / 2^20) * (parent clock rate / pdiv)
> +        */
> +       val = readl(pll->pll_base + ctrl->ndiv_int.offset);
> +       ndiv_int = (val >> ctrl->ndiv_int.shift) &
> +               bit_mask(ctrl->ndiv_int.width);
> +       ndiv = ndiv_int << ctrl->ndiv_int.shift;
> +
> +       if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
> +               val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
> +               ndiv_frac = (val >> ctrl->ndiv_frac.shift) &
> +                       bit_mask(ctrl->ndiv_frac.width);
> +
> +               if (ndiv_frac != 0)
> +                       ndiv = (ndiv_int << ctrl->ndiv_int.shift) | ndiv_frac;
> +       }
> +
> +       val = readl(pll->pll_base + ctrl->pdiv.offset);
> +       pdiv = (val >> ctrl->pdiv.shift) & bit_mask(ctrl->pdiv.width);
> +
> +       pll->rate = (ndiv * parent_rate) >> ctrl->ndiv_int.shift;
> +
> +       if (pdiv == 0)
> +               pll->rate *= 2;
> +       else
> +               pll->rate /= pdiv;
> +
> +       return pll->rate;
> +}
> +
> +static const struct clk_ops iproc_pll_ops = {
> +       .enable = iproc_pll_enable,
> +       .disable = iproc_pll_disable,
> +       .recalc_rate = iproc_pll_recalc_rate,
> +};
> +
> +void __init iproc_pll_setup(struct device_node *node,
> +               const struct iproc_pll_ctrl *ctrl,
> +               const struct iproc_pll_vco_freq_param *vco_param,
> +               unsigned int num_vco_entries)
> +{
> +       int ret;
> +       struct clk *clk;
> +       struct iproc_pll *pll;
> +       struct clk_init_data init;
> +       const char *parent_name;
> +       unsigned int rate;
> +
> +       if (WARN_ON(!ctrl))
> +               return;
> +
> +       pll = kzalloc(sizeof(*pll), GFP_KERNEL);
> +       if (WARN_ON(!pll))
> +               return;
> +
> +       pll->pll_base = of_iomap(node, 0);
> +       if (WARN_ON(!pll->pll_base))
> +               goto err_pll_iomap;
> +
> +       pll->pwr_base = of_iomap(node, 1);
> +       if (WARN_ON(!pll->pwr_base))
> +               goto err_pwr_iomap;
> +
> +       /* some PLLs require gating control at the top ASIU level */
> +       if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
> +               pll->asiu_base = of_iomap(node, 2);
> +               if (WARN_ON(!pll->asiu_base))
> +                       goto err_asiu_iomap;
> +       }
> +
> +       pll->ctrl = ctrl;
> +       pll->name = node->name;
> +       init.name = node->name;
> +       init.ops = &iproc_pll_ops;
> +       init.flags = 0;
> +       parent_name = of_clk_get_parent_name(node, 0);
> +       init.parent_names = (parent_name ? &parent_name : NULL);
> +       init.num_parents = (parent_name ? 1 : 0);
> +       pll->hw.init = &init;
> +
> +       /* configure the PLL to the desired VCO frequency if specified */
> +       ret = of_property_read_u32(node, "clock-frequency", &rate);
> +       if (!ret) {
> +               unsigned long parent_rate;
> +               int rate_index;
> +
> +               if (WARN_ON(!vco_param))
> +                       goto err_clk_register;
> +
> +               pll->num_vco_entries = num_vco_entries;
> +               pll->vco_param = vco_param;
> +
> +               parent_rate = __get_rate(parent_name);
> +               if (WARN_ON(!parent_rate))
> +                       goto err_clk_register;
> +
> +               rate_index = pll_get_rate_index(pll, rate);
> +               if (WARN_ON(rate_index < 0))
> +                       goto err_clk_register;
> +
> +               ret = pll_set_rate(pll, rate_index, parent_rate);
> +               if (WARN_ON(ret))
> +                       goto err_clk_register;
> +       }
> +
> +       clk = clk_register(NULL, &pll->hw);
> +       if (WARN_ON(IS_ERR(clk)))
> +               goto err_clk_register;
> +
> +       pll->clk_data.clk_num = 1;
> +       pll->clk_data.clks = &clk;
> +
> +       ret = of_clk_add_provider(node, of_clk_src_onecell_get,
> +                       &pll->clk_data);
> +       if (WARN_ON(ret))
> +               goto err_clk_add;
> +
> +       return;
> +
> +err_clk_add:
> +       clk_unregister(clk);
> +err_clk_register:
> +       if (pll->asiu_base)
> +               iounmap(pll->asiu_base);
> +err_asiu_iomap:
> +       iounmap(pll->pwr_base);
> +err_pwr_iomap:
> +       iounmap(pll->pll_base);
> +err_pll_iomap:
> +       kfree(pll);
> +}
> diff --git a/drivers/clk/bcm/clk-iproc.h b/drivers/clk/bcm/clk-iproc.h
> new file mode 100644
> index 0000000..4aa0479
> --- /dev/null
> +++ b/drivers/clk/bcm/clk-iproc.h
> @@ -0,0 +1,155 @@
> +/*
> + * Copyright (C) 2014 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef _CLK_IPROC_H
> +#define _CLK_IPROC_H
> +
> +#include <linux/kernel.h>
> +#include <linux/list.h>
> +#include <linux/spinlock.h>
> +#include <linux/slab.h>
> +#include <linux/device.h>
> +#include <linux/of.h>
> +#include <linux/clk-provider.h>
> +
> +#define IPROC_CLK_NAME_LEN 25
> +#define IPROC_CLK_INVALID_OFFSET 0xffffffff
> +#define bit_mask(width) ((1 << (width)) - 1)
> +
> +/* clock should not be disabled at runtime */
> +#define IPROC_CLK_AON BIT(0)
> +
> +/* PLL requires gating through ASIU */
> +#define IPROC_CLK_PLL_ASIU BIT(1)
> +
> +/* PLL has fractional part of the NDIV */
> +#define IPROC_CLK_PLL_HAS_NDIV_FRAC BIT(2)
> +
> +/*
> + * Parameters for VCO frequency configuration
> + *
> + * VCO frequency =
> + * ((ndiv_int + ndiv_frac / 2^20) * (ref freqeuncy  / pdiv)
> + */
> +struct iproc_pll_vco_freq_param {
> +       unsigned long rate;
> +       unsigned int ndiv_int;
> +       unsigned int ndiv_frac;
> +       unsigned int pdiv;
> +};
> +
> +struct iproc_clk_reg_op {
> +       unsigned int offset;
> +       unsigned int shift;
> +       unsigned int width;
> +};
> +
> +/*
> + * Clock gating control at the top ASIU level
> + */
> +struct iproc_asiu_gate {
> +       unsigned int offset;
> +       unsigned int en_shift;
> +};
> +
> +/*
> + * Control of powering on/off of a PLL
> + *
> + * Before powering off a PLL, input isolation (ISO) needs to be enabled
> + */
> +struct iproc_pll_aon_pwr_ctrl {
> +       unsigned int offset;
> +       unsigned int pwr_width;
> +       unsigned int pwr_shift;
> +       unsigned int iso_shift;
> +};
> +
> +/*
> + * Control of the PLL reset, with Ki, Kp, and Ka parameters
> + */
> +struct iproc_pll_reset_ctrl {
> +       unsigned int offset;
> +       unsigned int reset_shift;
> +       unsigned int p_reset_shift;
> +       unsigned int ki_shift;
> +       unsigned int ki_width;
> +       unsigned int kp_shift;
> +       unsigned int kp_width;
> +       unsigned int ka_shift;
> +       unsigned int ka_width;
> +};
> +
> +struct iproc_pll_vco_ctrl {
> +       unsigned int u_offset;
> +       unsigned int l_offset;
> +};
> +
> +/*
> + * Main PLL control parameters
> + */
> +struct iproc_pll_ctrl {
> +       unsigned long flags;
> +       struct iproc_pll_aon_pwr_ctrl aon;
> +       struct iproc_asiu_gate asiu;
> +       struct iproc_pll_reset_ctrl reset;
> +       struct iproc_clk_reg_op ndiv_int;
> +       struct iproc_clk_reg_op ndiv_frac;
> +       struct iproc_clk_reg_op pdiv;
> +       struct iproc_pll_vco_ctrl vco_ctrl;
> +       struct iproc_clk_reg_op status;
> +};
> +
> +/*
> + * Controls enabling/disabling a PLL derived clock
> + */
> +struct iproc_clk_enable_ctrl {
> +       unsigned int offset;
> +       unsigned int enable_shift;
> +       unsigned int hold_shift;
> +       unsigned int bypass_shift;
> +};
> +
> +/*
> + * Main clock control parameters for clocks derived from the PLLs
> + */
> +struct iproc_clk_ctrl {
> +       unsigned int channel;
> +       unsigned long flags;
> +       struct iproc_clk_enable_ctrl enable;
> +       struct iproc_clk_reg_op mdiv;
> +};
> +
> +/*
> + * Divisor of the ASIU clocks
> + */
> +struct iproc_asiu_div {
> +       unsigned int offset;
> +       unsigned int en_shift;
> +       unsigned int high_shift;
> +       unsigned int high_width;
> +       unsigned int low_shift;
> +       unsigned int low_width;
> +};
> +
> +extern void __init iproc_armpll_setup(struct device_node *node);
> +extern void __init iproc_pll_setup(struct device_node *node,
> +               const struct iproc_pll_ctrl *ctrl,
> +               const struct iproc_pll_vco_freq_param *vco_param,
> +               unsigned int num_freqs);
> +extern void __init iproc_clk_setup(struct device_node *node,
> +               const struct iproc_clk_ctrl *ctrl, unsigned int num_clks);
> +extern void __init iproc_asiu_setup(struct device_node *node,
> +               const struct iproc_asiu_div *div,
> +               const struct iproc_asiu_gate *gate, unsigned int num_clks);
> +
> +#endif /* _CLK_IPROC_H */
> --
> 1.7.9.5
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel at lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Re: [PATCH 2/5] gpio: Cygnus: add GPIO driver

[Ray Jui]

On 12/5/2014 8:24 PM, Joe Perches wrote:
> On Fri, 2014-12-05 at 19:41 -0800, Ray Jui wrote:
>> On 12/5/2014 6:34 PM, Joe Perches wrote:
>>> On Fri, 2014-12-05 at 18:14 -0800, Ray Jui wrote:
>>>> On 12/5/2014 5:28 PM, Joe Perches wrote:
>>>>> On Fri, 2014-12-05 at 16:40 -0800, Ray Jui wrote:
>>>>>> +			for_each_set_bit(bit, &val, 32) {
> []
>> Actually, by reviewing the code more deeply, I'm not sure why using
>> for_each_set_bit here is 'endian unsafe'.
>
> It's not.  The 32 confused me as it was long
> and sizeof(long) isn't necessarily 32.
>
> Maybe the 32 should be a #define
>
>
>
Okay, to improve readability, I will change 32 to NGPIOS_PER_BANK.

Re: [PATCH 2/5] gpio: Cygnus: add GPIO driver

[Ray Jui]

On 12/5/2014 8:24 PM, Joe Perches wrote:
> On Fri, 2014-12-05 at 19:41 -0800, Ray Jui wrote:
>> On 12/5/2014 6:34 PM, Joe Perches wrote:
>>> On Fri, 2014-12-05 at 18:14 -0800, Ray Jui wrote:
>>>> On 12/5/2014 5:28 PM, Joe Perches wrote:
>>>>> On Fri, 2014-12-05 at 16:40 -0800, Ray Jui wrote:
>>>>>> +			for_each_set_bit(bit, &val, 32) {
> []
>> Actually, by reviewing the code more deeply, I'm not sure why using
>> for_each_set_bit here is 'endian unsafe'.
>
> It's not.  The 32 confused me as it was long
> and sizeof(long) isn't necessarily 32.
>
> Maybe the 32 should be a #define
>
>
>
Okay, to improve readability, I will change 32 to NGPIOS_PER_BANK.

[PATCH 2/5] gpio: Cygnus: add GPIO driver

[Ray Jui]

On 12/5/2014 8:24 PM, Joe Perches wrote:
> On Fri, 2014-12-05 at 19:41 -0800, Ray Jui wrote:
>> On 12/5/2014 6:34 PM, Joe Perches wrote:
>>> On Fri, 2014-12-05 at 18:14 -0800, Ray Jui wrote:
>>>> On 12/5/2014 5:28 PM, Joe Perches wrote:
>>>>> On Fri, 2014-12-05 at 16:40 -0800, Ray Jui wrote:
>>>>>> +			for_each_set_bit(bit, &val, 32) {
> []
>> Actually, by reviewing the code more deeply, I'm not sure why using
>> for_each_set_bit here is 'endian unsafe'.
>
> It's not.  The 32 confused me as it was long
> and sizeof(long) isn't necessarily 32.
>
> Maybe the 32 should be a #define
>
>
>
Okay, to improve readability, I will change 32 to NGPIOS_PER_BANK.

Re: [PATCH 2/4] clk: iproc: add initial common clock support

[Ray Jui]

On 12/6/2014 2:20 PM, Tim Kryger wrote:
> On Thu, Dec 4, 2014 at 1:43 PM, Ray Jui <rjui@broadcom.com> wrote:
>> This adds basic and generic support for various iProc PLLs and clocks
>> including the ARMPLL, GENPLL, LCPLL, MIPIPLL, and ASIU clocks.
>>
>> SoCs under the iProc architecture can define their specific register
>> offsets and clock parameters for their PLL and clock controllers. These
>> parameters can be passed as arugments into the generic iProc PLL and
>> clock setup functions
>>
>> Derived from code originally provided by Jonathan Richardson
>> <jonathar@broadcom.com>
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>> ---
>>   drivers/clk/Makefile               |    2 +-
>>   drivers/clk/bcm/Kconfig            |    9 +
>>   drivers/clk/bcm/Makefile           |    1 +
>>   drivers/clk/bcm/clk-iproc-armpll.c |  286 +++++++++++++++++++++
>>   drivers/clk/bcm/clk-iproc-asiu.c   |  275 ++++++++++++++++++++
>>   drivers/clk/bcm/clk-iproc-clk.c    |  238 ++++++++++++++++++
>>   drivers/clk/bcm/clk-iproc-pll.c    |  483 ++++++++++++++++++++++++++++++++++++
>>   drivers/clk/bcm/clk-iproc.h        |  155 ++++++++++++
>>   8 files changed, 1448 insertions(+), 1 deletion(-)
>>   create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
>>   create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
>>   create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
>>   create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
>>   create mode 100644 drivers/clk/bcm/clk-iproc.h
>>
>> diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
>> index d5fba5b..eff0213 100644
>> --- a/drivers/clk/Makefile
>> +++ b/drivers/clk/Makefile
>> @@ -41,7 +41,7 @@ obj-$(CONFIG_ARCH_VT8500)             += clk-vt8500.o
>>   obj-$(CONFIG_COMMON_CLK_WM831X)                += clk-wm831x.o
>>   obj-$(CONFIG_COMMON_CLK_XGENE)         += clk-xgene.o
>>   obj-$(CONFIG_COMMON_CLK_AT91)          += at91/
>> -obj-$(CONFIG_ARCH_BCM_MOBILE)          += bcm/
>> +obj-$(CONFIG_ARCH_BCM)                 += bcm/
>>   obj-$(CONFIG_ARCH_BERLIN)              += berlin/
>>   obj-$(CONFIG_ARCH_HI3xxx)              += hisilicon/
>>   obj-$(CONFIG_ARCH_HIP04)               += hisilicon/
>
> It may be best to move the above change into its own commit.
>
Okay. Will make this change along with other changes if required. Still 
waiting for more code review comments at this point.

>> diff --git a/drivers/clk/bcm/Kconfig b/drivers/clk/bcm/Kconfig
>> index 75506e5..66b5b7f 100644
>> --- a/drivers/clk/bcm/Kconfig
>> +++ b/drivers/clk/bcm/Kconfig
>> @@ -7,3 +7,12 @@ config CLK_BCM_KONA
>>            Enable common clock framework support for Broadcom SoCs
>>            using "Kona" style clock control units, including those
>>            in the BCM281xx and BCM21664 families.
>> +
>> +config COMMON_CLK_IPROC
>> +       bool "Broadcom iProc clock support"
>> +       depends on ARCH_BCM_IPROC
>> +       depends on COMMON_CLK
>> +       default y
>> +       help
>> +         Enable common clock framework support for Broadcom SoCs
>> +         based on the "iProc" architecture
>> diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
>> index 6297d05..6926636 100644
>> --- a/drivers/clk/bcm/Makefile
>> +++ b/drivers/clk/bcm/Makefile
>> @@ -2,3 +2,4 @@ obj-$(CONFIG_CLK_BCM_KONA)      += clk-kona.o
>>   obj-$(CONFIG_CLK_BCM_KONA)     += clk-kona-setup.o
>>   obj-$(CONFIG_CLK_BCM_KONA)     += clk-bcm281xx.o
>>   obj-$(CONFIG_CLK_BCM_KONA)     += clk-bcm21664.o
>> +obj-$(CONFIG_COMMON_CLK_IPROC) += clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
>> diff --git a/drivers/clk/bcm/clk-iproc-armpll.c b/drivers/clk/bcm/clk-iproc-armpll.c
>> new file mode 100644
>> index 0000000..ec9b130
>> --- /dev/null
>> +++ b/drivers/clk/bcm/clk-iproc-armpll.c
>> @@ -0,0 +1,286 @@
>> +/*
>> + * Copyright (C) 2014 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/slab.h>
>> +#include <linux/err.h>
>> +#include <linux/clk-provider.h>
>> +#include <linux/io.h>
>> +#include <linux/of.h>
>> +#include <linux/clkdev.h>
>> +#include <linux/of_address.h>
>> +
>> +#define IPROC_CLK_MAX_FREQ_POLICY                    0x3
>> +#define IPROC_CLK_POLICY_FREQ_OFFSET                 0x008
>> +#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT      8
>> +#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK       0x7
>> +
>> +#define IPROC_CLK_PLLARMA_OFFSET                     0xc00
>> +#define IPROC_CLK_PLLARMA_LOCK_SHIFT                 28
>> +#define IPROC_CLK_PLLARMA_PDIV_SHIFT                 24
>> +#define IPROC_CLK_PLLARMA_PDIV_MASK                  0xf
>> +#define IPROC_CLK_PLLARMA_NDIV_INT_SHIFT             8
>> +#define IPROC_CLK_PLLARMA_NDIV_INT_MASK              0x3ff
>> +
>> +#define IPROC_CLK_PLLARMB_OFFSET                     0xc04
>> +#define IPROC_CLK_PLLARMB_NDIV_FRAC_MASK             0xfffff
>> +
>> +#define IPROC_CLK_PLLARMC_OFFSET                     0xc08
>> +#define IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT            8
>> +#define IPROC_CLK_PLLARMC_MDIV_MASK                  0xff
>> +
>> +#define IPROC_CLK_PLLARMCTL5_OFFSET                  0xc20
>> +#define IPROC_CLK_PLLARMCTL5_H_MDIV_MASK             0xff
>> +
>> +#define IPROC_CLK_PLLARM_OFFSET_OFFSET               0xc24
>> +#define IPROC_CLK_PLLARM_SW_CTL_SHIFT                29
>> +#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT       20
>> +#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK        0xff
>> +#define IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK       0xfffff
>> +
>> +#define IPROC_CLK_ARM_DIV_OFFSET                     0xe00
>> +#define IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT  4
>> +#define IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK        0xf
>> +
>> +#define IPROC_CLK_POLICY_DBG_OFFSET                  0xec0
>> +#define IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT          12
>> +#define IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK           0x7
>> +
>> +enum iproc_arm_pll_fid {
>> +       ARM_PLL_FID_CRYSTAL_CLK   = 0,
>> +       ARM_PLL_FID_SYS_CLK       = 2,
>> +       ARM_PLL_FID_CH0_SLOW_CLK  = 6,
>> +       ARM_PLL_FID_CH1_FAST_CLK  = 7
>> +};
>> +
>> +struct iproc_arm_pll {
>> +       struct clk_hw hw;
>> +       void __iomem *base;
>> +       struct clk_onecell_data clk_data;
>> +       unsigned long rate;
>> +};
>> +
>> +#define to_iproc_arm_pll(hw) container_of(hw, struct iproc_arm_pll, hw)
>> +
>> +static unsigned int __get_fid(struct iproc_arm_pll *pll)
>> +{
>> +       u32 val;
>> +       unsigned int policy, fid, active_fid;
>> +
>> +       val = readl(pll->base + IPROC_CLK_ARM_DIV_OFFSET);
>> +       if (val & (1 << IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT))
>> +               policy = val & IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK;
>> +       else
>> +               policy = 0;
>> +
>> +       /* something is seriously wrong */
>> +       BUG_ON(policy > IPROC_CLK_MAX_FREQ_POLICY);
>> +
>> +       val = readl(pll->base + IPROC_CLK_POLICY_FREQ_OFFSET);
>> +       fid = (val >> (IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT * policy)) &
>> +               IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK;
>> +
>> +       val = readl(pll->base + IPROC_CLK_POLICY_DBG_OFFSET);
>> +       active_fid = IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK &
>> +               (val >> IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT);
>> +       if (fid != active_fid) {
>> +               pr_debug("%s: fid override %u->%u\n", __func__, fid,
>> +                               active_fid);
>> +               fid = active_fid;
>> +       }
>> +
>> +       pr_debug("%s: active fid: %u\n", __func__, fid);
>> +
>> +       return fid;
>> +}
>> +
>> +/*
>> + * Determine the mdiv (post divider) based on the frequency ID being used.
>> + * There are 4 sources that can be used to derive the output clock rate:
>> + *    - 25 MHz Crystal
>> + *    - System clock
>> + *    - PLL channel 0 (slow clock)
>> + *    - PLL channel 1 (fast clock)
>> + */
>> +static int __get_mdiv(struct iproc_arm_pll *pll)
>> +{
>> +       unsigned int fid;
>> +       int mdiv;
>> +       u32 val;
>> +
>> +       fid = __get_fid(pll);
>> +
>> +       switch (fid) {
>> +       case ARM_PLL_FID_CRYSTAL_CLK:
>> +       case ARM_PLL_FID_SYS_CLK:
>> +               mdiv = 1;
>> +               break;
>> +
>> +       case ARM_PLL_FID_CH0_SLOW_CLK:
>> +               val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
>> +               mdiv = val & IPROC_CLK_PLLARMC_MDIV_MASK;
>> +               if (mdiv == 0)
>> +                       mdiv = 256;
>> +               break;
>> +
>> +       case ARM_PLL_FID_CH1_FAST_CLK:
>> +               val = readl(pll->base + IPROC_CLK_PLLARMCTL5_OFFSET);
>> +               mdiv = val & IPROC_CLK_PLLARMCTL5_H_MDIV_MASK;
>> +               if (mdiv == 0)
>> +                       mdiv = 256;
>> +               break;
>> +
>> +       default:
>> +               mdiv = -EFAULT;
>> +       }
>> +
>> +       return mdiv;
>> +}
>> +
>> +static unsigned int __get_ndiv(struct iproc_arm_pll *pll)
>> +{
>> +       u32 val;
>> +       unsigned int ndiv_int, ndiv_frac, ndiv;
>> +
>> +       val = readl(pll->base + IPROC_CLK_PLLARM_OFFSET_OFFSET);
>> +       if (val & (1 << IPROC_CLK_PLLARM_SW_CTL_SHIFT)) {
>> +               /*
>> +                * offset mode is active. Read the ndiv from the PLLARM OFFSET
>> +                * register
>> +                */
>> +               ndiv_int = (val >> IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT) &
>> +                       IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK;
>> +               if (ndiv_int == 0)
>> +                       ndiv_int = 256;
>> +
>> +               ndiv_frac = val & IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK;
>> +       } else {
>> +               /* offset mode not active */
>> +               val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
>> +               ndiv_int = (val >> IPROC_CLK_PLLARMA_NDIV_INT_SHIFT) &
>> +                       IPROC_CLK_PLLARMA_NDIV_INT_MASK;
>> +               if (ndiv_int == 0)
>> +                       ndiv_int = 1024;
>> +
>> +               val = readl(pll->base + IPROC_CLK_PLLARMB_OFFSET);
>> +               ndiv_frac = val & IPROC_CLK_PLLARMB_NDIV_FRAC_MASK;
>> +       }
>> +
>> +       ndiv = (ndiv_int << 20) | ndiv_frac;
>> +
>> +       return ndiv;
>> +}
>> +
>> +/*
>> + * The output frequency of the ARM PLL is calculated based on the ARM PLL
>> + * divider values:
>> + *   pdiv = ARM PLL pre-divider
>> + *   ndiv = ARM PLL multiplier
>> + *   mdiv = ARM PLL post divider
>> + *
>> + * The frequency is calculated by:
>> + *   ((ndiv * parent clock rate) / pdiv) / mdiv
>> + */
>> +static unsigned long iproc_arm_pll_recalc_rate(struct clk_hw *hw,
>> +               unsigned long parent_rate)
>> +{
>> +       struct iproc_arm_pll *pll = to_iproc_arm_pll(hw);
>> +       u32 val;
>> +       int mdiv;
>> +       u64 ndiv;
>> +       unsigned int pdiv;
>> +
>> +       /* in bypass mode, use parent rate */
>> +       val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
>> +       if (val & (1 << IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT)) {
>> +               pll->rate = parent_rate;
>> +               return pll->rate;
>> +       }
>> +
>> +       /* PLL needs to be locked */
>> +       val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
>> +       if (!(val & (1 << IPROC_CLK_PLLARMA_LOCK_SHIFT))) {
>> +               pll->rate = 0;
>> +               return 0;
>> +       }
>> +
>> +       pdiv = (val >> IPROC_CLK_PLLARMA_PDIV_SHIFT) &
>> +               IPROC_CLK_PLLARMA_PDIV_MASK;
>> +       if (pdiv == 0)
>> +               pdiv = 16;
>> +
>> +       ndiv = __get_ndiv(pll);
>> +       mdiv = __get_mdiv(pll);
>> +       if (mdiv <= 0) {
>> +               pll->rate = 0;
>> +               return 0;
>> +       }
>> +       pll->rate = (ndiv * parent_rate) >> 20;
>> +       pll->rate = (pll->rate / pdiv) / mdiv;
>> +
>> +       pr_debug("%s: ARM PLL rate: %lu. parent rate: %lu\n", __func__,
>> +                       pll->rate, parent_rate);
>> +       pr_debug("%s: ndiv_int: %u, pdiv: %u, mdiv: %d\n", __func__,
>> +                       (unsigned int)(ndiv >> 20), pdiv, mdiv);
>> +
>> +       return pll->rate;
>> +}
>> +
>> +static const struct clk_ops iproc_arm_pll_ops = {
>> +       .recalc_rate = iproc_arm_pll_recalc_rate,
>> +};
>> +
>> +void __init iproc_armpll_setup(struct device_node *node)
>> +{
>> +       int ret;
>> +       struct clk *clk;
>> +       struct iproc_arm_pll *pll;
>> +       struct clk_init_data init;
>> +       const char *parent_name;
>> +
>> +       pll = kzalloc(sizeof(*pll), GFP_KERNEL);
>> +       if (WARN_ON(!pll))
>> +               return;
>> +
>> +       pll->base = of_iomap(node, 0);
>> +       if (WARN_ON(!pll->base))
>> +               goto err_free_pll;
>> +
>> +       init.name = node->name;
>> +       init.ops = &iproc_arm_pll_ops;
>> +       init.flags = 0;
>> +       parent_name = of_clk_get_parent_name(node, 0);
>> +       init.parent_names = (parent_name ? &parent_name : NULL);
>> +       init.num_parents = (parent_name ? 1 : 0);
>> +       pll->hw.init = &init;
>> +
>> +       clk = clk_register(NULL, &pll->hw);
>> +       if (WARN_ON(IS_ERR(clk)))
>> +               goto err_iounmap;
>> +
>> +       pll->clk_data.clk_num = 1;
>> +       pll->clk_data.clks = &clk;
>> +
>> +       ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
>> +       if (WARN_ON(ret))
>> +               goto err_clk_unregister;
>> +
>> +       return;
>> +
>> +err_clk_unregister:
>> +       clk_unregister(clk);
>> +err_iounmap:
>> +       iounmap(pll->base);
>> +err_free_pll:
>> +       kfree(pll);
>> +}
>> diff --git a/drivers/clk/bcm/clk-iproc-asiu.c b/drivers/clk/bcm/clk-iproc-asiu.c
>> new file mode 100644
>> index 0000000..ab86b8c
>> --- /dev/null
>> +++ b/drivers/clk/bcm/clk-iproc-asiu.c
>> @@ -0,0 +1,275 @@
>> +/*
>> + * Copyright (C) 2014 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/err.h>
>> +#include <linux/clk-provider.h>
>> +#include <linux/io.h>
>> +#include <linux/of.h>
>> +#include <linux/clkdev.h>
>> +#include <linux/of_address.h>
>> +#include <linux/delay.h>
>> +
>> +#include "clk-iproc.h"
>> +
>> +struct iproc_asiu;
>> +
>> +struct iproc_asiu_clk {
>> +       struct clk_hw hw;
>> +       const char *name;
>> +       struct iproc_asiu *asiu;
>> +       unsigned long rate;
>> +       struct iproc_asiu_div div;
>> +       struct iproc_asiu_gate gate;
>> +};
>> +
>> +struct iproc_asiu {
>> +       void __iomem *div_base;
>> +       void __iomem *gate_base;
>> +
>> +       struct clk_onecell_data clk_data;
>> +       struct iproc_asiu_clk *clks;
>> +};
>> +
>> +#define to_asiu_clk(hw) container_of(hw, struct iproc_asiu_clk, hw)
>> +
>> +static int iproc_asiu_clk_enable(struct clk_hw *hw)
>> +{
>> +       struct iproc_asiu_clk *clk = to_asiu_clk(hw);
>> +       struct iproc_asiu *asiu = clk->asiu;
>> +       u32 val;
>> +
>> +       /* some clocks at the ASIU level are always enabled */
>> +       if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
>> +               return 0;
>> +
>> +       val = readl(asiu->gate_base + clk->gate.offset);
>> +       val |= (1 << clk->gate.en_shift);
>> +       writel(val, asiu->gate_base + clk->gate.offset);
>> +
>> +       return 0;
>> +}
>> +
>> +static void iproc_asiu_clk_disable(struct clk_hw *hw)
>> +{
>> +       struct iproc_asiu_clk *clk = to_asiu_clk(hw);
>> +       struct iproc_asiu *asiu = clk->asiu;
>> +       u32 val;
>> +
>> +       /* some clocks at the ASIU level are always enabled */
>> +       if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
>> +               return;
>> +
>> +       val = readl(asiu->gate_base + clk->gate.offset);
>> +       val &= ~(1 << clk->gate.en_shift);
>> +       writel(val, asiu->gate_base + clk->gate.offset);
>> +}
>> +
>> +static unsigned long iproc_asiu_clk_recalc_rate(struct clk_hw *hw,
>> +               unsigned long parent_rate)
>> +{
>> +       struct iproc_asiu_clk *clk = to_asiu_clk(hw);
>> +       struct iproc_asiu *asiu = clk->asiu;
>> +       u32 val;
>> +       unsigned int div_h, div_l;
>> +
>> +       if (parent_rate == 0) {
>> +               clk->rate = 0;
>> +               return 0;
>> +       }
>> +
>> +       /* if clock divisor is not enabled, simply return parent rate */
>> +       val = readl(asiu->div_base + clk->div.offset);
>> +       if ((val & (1 << clk->div.en_shift)) == 0) {
>> +               clk->rate = parent_rate;
>> +               return parent_rate;
>> +       }
>> +
>> +       /* clock rate = parent rate / (high_div + 1) + (low_div + 1) */
>> +       div_h = (val >> clk->div.high_shift) & bit_mask(clk->div.high_width);
>> +       div_h++;
>> +       div_l = (val >> clk->div.low_shift) & bit_mask(clk->div.low_width);
>> +       div_l++;
>> +
>> +       clk->rate = parent_rate / (div_h + div_l);
>> +       pr_debug("%s: rate: %lu. parent rate: %lu div_h: %u div_l: %u\n",
>> +               __func__, clk->rate, parent_rate, div_h, div_l);
>> +
>> +       return clk->rate;
>> +}
>> +
>> +static long iproc_asiu_clk_round_rate(struct clk_hw *hw, unsigned long rate,
>> +               unsigned long *parent_rate)
>> +{
>> +       unsigned int div;
>> +
>> +       if (rate == 0 || *parent_rate == 0)
>> +               return -EINVAL;
>> +
>> +       if (rate == *parent_rate)
>> +               return *parent_rate;
>> +
>> +       div = DIV_ROUND_UP(*parent_rate, rate);
>> +       if (div < 2)
>> +               return *parent_rate;
>> +
>> +       return *parent_rate / div;
>> +}
>> +
>> +static int iproc_asiu_clk_set_rate(struct clk_hw *hw, unsigned long rate,
>> +               unsigned long parent_rate)
>> +{
>> +       struct iproc_asiu_clk *clk = to_asiu_clk(hw);
>> +       struct iproc_asiu *asiu = clk->asiu;
>> +       unsigned int div, div_h, div_l;
>> +       u32 val;
>> +
>> +       if (rate == 0 || parent_rate == 0)
>> +               return -EINVAL;
>> +
>> +       /* simply disable the divisor if one wants the same rate as parent */
>> +       if (rate == parent_rate) {
>> +               val = readl(asiu->div_base + clk->div.offset);
>> +               val &= ~(1 << clk->div.en_shift);
>> +               writel(val, asiu->div_base + clk->div.offset);
>> +               return 0;
>> +       }
>> +
>> +       div = DIV_ROUND_UP(parent_rate, rate);
>> +       if (div < 2)
>> +               return -EINVAL;
>> +
>> +       div_h = div_l = div >> 1;
>> +       div_h--;
>> +       div_l--;
>> +
>> +       val = readl(asiu->div_base + clk->div.offset);
>> +       val |= 1 << clk->div.en_shift;
>> +       if (div_h) {
>> +               val &= ~(bit_mask(clk->div.high_width)
>> +                               << clk->div.high_shift);
>> +               val |= div_h << clk->div.high_shift;
>> +       } else {
>> +               val &= ~(bit_mask(clk->div.high_width)
>> +                               << clk->div.high_shift);
>> +       }
>> +       if (div_l) {
>> +               val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
>> +               val |= div_l << clk->div.low_shift;
>> +       } else {
>> +               val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
>> +       }
>> +       writel(val, asiu->div_base + clk->div.offset);
>> +
>> +       return 0;
>> +}
>> +
>> +static const struct clk_ops iproc_asiu_ops = {
>> +       .enable = iproc_asiu_clk_enable,
>> +       .disable = iproc_asiu_clk_disable,
>> +       .recalc_rate = iproc_asiu_clk_recalc_rate,
>> +       .round_rate = iproc_asiu_clk_round_rate,
>> +       .set_rate = iproc_asiu_clk_set_rate,
>> +};
>> +
>> +void __init iproc_asiu_setup(struct device_node *node,
>> +               const struct iproc_asiu_div *div,
>> +               const struct iproc_asiu_gate *gate, unsigned int num_clks)
>> +{
>> +       int i, ret;
>> +       struct iproc_asiu *asiu;
>> +
>> +       if (WARN_ON(!gate || !div))
>> +               return;
>> +
>> +       asiu = kzalloc(sizeof(*asiu), GFP_KERNEL);
>> +       if (WARN_ON(!asiu))
>> +               return;
>> +
>> +       asiu->clk_data.clk_num = num_clks;
>> +       asiu->clk_data.clks = kcalloc(num_clks, sizeof(*asiu->clk_data.clks),
>> +                       GFP_KERNEL);
>> +       if (WARN_ON(!asiu->clk_data.clks))
>> +               goto err_clks;
>> +
>> +       asiu->clks = kcalloc(num_clks, sizeof(*asiu->clks), GFP_KERNEL);
>> +       if (WARN_ON(!asiu->clks))
>> +               goto err_asiu_clks;
>> +
>> +       asiu->div_base = of_iomap(node, 0);
>> +       if (WARN_ON(!asiu->div_base))
>> +               goto err_iomap_div;
>> +
>> +       asiu->gate_base = of_iomap(node, 1);
>> +       if (WARN_ON(!asiu->gate_base))
>> +               goto err_iomap_gate;
>> +
>> +       for (i = 0; i < num_clks; i++) {
>> +               struct clk_init_data init;
>> +               struct clk *clk;
>> +               const char *parent_name;
>> +               struct iproc_asiu_clk *asiu_clk;
>> +               const char *clk_name;
>> +
>> +               clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
>> +               if (WARN_ON(!clk_name))
>> +                       goto err_clk_register;
>> +
>> +               ret = of_property_read_string_index(node, "clock-output-names",
>> +                               i, &clk_name);
>> +               if (WARN_ON(ret))
>> +                       goto err_clk_register;
>> +
>> +               asiu_clk = &asiu->clks[i];
>> +               asiu_clk->name = clk_name;
>> +               asiu_clk->asiu = asiu;
>> +               asiu_clk->div = div[i];
>> +               asiu_clk->gate = gate[i];
>> +               init.name = clk_name;
>> +               init.ops = &iproc_asiu_ops;
>> +               init.flags = 0;
>> +               parent_name = of_clk_get_parent_name(node, 0);
>> +               init.parent_names = (parent_name ? &parent_name : NULL);
>> +               init.num_parents = (parent_name ? 1 : 0);
>> +               asiu_clk->hw.init = &init;
>> +
>> +               clk = clk_register(NULL, &asiu_clk->hw);
>> +               if (WARN_ON(IS_ERR(clk)))
>> +                       goto err_clk_register;
>> +               asiu->clk_data.clks[i] = clk;
>> +       }
>> +
>> +       ret = of_clk_add_provider(node, of_clk_src_onecell_get,
>> +                       &asiu->clk_data);
>> +       if (WARN_ON(ret))
>> +               goto err_clk_register;
>> +
>> +       return;
>> +
>> +err_clk_register:
>> +       for (i = 0; i < num_clks; i++)
>> +               kfree(asiu->clks[i].name);
>> +       iounmap(asiu->gate_base);
>> +
>> +err_iomap_gate:
>> +       iounmap(asiu->div_base);
>> +
>> +err_iomap_div:
>> +       kfree(asiu->clks);
>> +
>> +err_asiu_clks:
>> +       kfree(asiu->clk_data.clks);
>> +
>> +err_clks:
>> +       kfree(asiu);
>> +}
>> diff --git a/drivers/clk/bcm/clk-iproc-clk.c b/drivers/clk/bcm/clk-iproc-clk.c
>> new file mode 100644
>> index 0000000..be3c42c
>> --- /dev/null
>> +++ b/drivers/clk/bcm/clk-iproc-clk.c
>> @@ -0,0 +1,238 @@
>> +/*
>> + * Copyright (C) 2014 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/err.h>
>> +#include <linux/clk-provider.h>
>> +#include <linux/io.h>
>> +#include <linux/of.h>
>> +#include <linux/clkdev.h>
>> +#include <linux/of_address.h>
>> +#include <linux/delay.h>
>> +
>> +#include "clk-iproc.h"
>> +
>> +struct iproc_pll;
>> +
>> +struct iproc_clk {
>> +       struct clk_hw hw;
>> +       const char *name;
>> +       struct iproc_pll *pll;
>> +       unsigned long rate;
>> +       const struct iproc_clk_ctrl *ctrl;
>> +};
>> +
>> +struct iproc_pll {
>> +       void __iomem *base;
>> +       struct clk_onecell_data clk_data;
>> +       struct iproc_clk *clks;
>> +};
>> +
>> +#define to_iproc_clk(hw) container_of(hw, struct iproc_clk, hw)
>> +
>> +static int iproc_clk_enable(struct clk_hw *hw)
>> +{
>> +       struct iproc_clk *clk = to_iproc_clk(hw);
>> +       const struct iproc_clk_ctrl *ctrl = clk->ctrl;
>> +       struct iproc_pll *pll = clk->pll;
>> +       u32 val;
>> +
>> +       /* channel enable is active low */
>> +       val = readl(pll->base + ctrl->enable.offset);
>> +       val &= ~(1 << ctrl->enable.enable_shift);
>> +       writel(val, pll->base + ctrl->enable.offset);
>> +
>> +       /* also make sure channel is not held */
>> +       val = readl(pll->base + ctrl->enable.offset);
>> +       val &= ~(1 << ctrl->enable.hold_shift);
>> +       writel(val, pll->base + ctrl->enable.offset);
>> +
>> +       return 0;
>> +}
>> +
>> +static void iproc_clk_disable(struct clk_hw *hw)
>> +{
>> +       struct iproc_clk *clk = to_iproc_clk(hw);
>> +       const struct iproc_clk_ctrl *ctrl = clk->ctrl;
>> +       struct iproc_pll *pll = clk->pll;
>> +       u32 val;
>> +
>> +       if (ctrl->flags & IPROC_CLK_AON)
>> +               return;
>> +
>> +       val = readl(pll->base + ctrl->enable.offset);
>> +       val |= 1 << ctrl->enable.enable_shift;
>> +       writel(val, pll->base + ctrl->enable.offset);
>> +}
>> +
>> +static unsigned long iproc_clk_recalc_rate(struct clk_hw *hw,
>> +               unsigned long parent_rate)
>> +{
>> +       struct iproc_clk *clk = to_iproc_clk(hw);
>> +       const struct iproc_clk_ctrl *ctrl = clk->ctrl;
>> +       struct iproc_pll *pll = clk->pll;
>> +       u32 val;
>> +       unsigned int mdiv;
>> +
>> +       if (parent_rate == 0)
>> +               return 0;
>> +
>> +       val = readl(pll->base + ctrl->mdiv.offset);
>> +       mdiv = (val >> ctrl->mdiv.shift) & bit_mask(ctrl->mdiv.width);
>> +       if (mdiv == 0)
>> +               mdiv = 256;
>> +
>> +       clk->rate = parent_rate / mdiv;
>> +
>> +       return clk->rate;
>> +}
>> +
>> +static long iproc_clk_round_rate(struct clk_hw *hw, unsigned long rate,
>> +               unsigned long *parent_rate)
>> +{
>> +       unsigned int div;
>> +
>> +       if (rate == 0 || *parent_rate == 0)
>> +               return -EINVAL;
>> +
>> +       if (rate == *parent_rate)
>> +               return *parent_rate;
>> +
>> +       div = DIV_ROUND_UP(*parent_rate, rate);
>> +       if (div < 2)
>> +               return *parent_rate;
>> +
>> +       if (div > 256)
>> +               div = 256;
>> +
>> +       return *parent_rate / div;
>> +}
>> +
>> +static int iproc_clk_set_rate(struct clk_hw *hw, unsigned long rate,
>> +               unsigned long parent_rate)
>> +{
>> +       struct iproc_clk *clk = to_iproc_clk(hw);
>> +       const struct iproc_clk_ctrl *ctrl = clk->ctrl;
>> +       struct iproc_pll *pll = clk->pll;
>> +       u32 val;
>> +       unsigned int div;
>> +
>> +       if (rate == 0 || parent_rate == 0)
>> +               return -EINVAL;
>> +
>> +       div = DIV_ROUND_UP(parent_rate, rate);
>> +       if (div > 256)
>> +               return -EINVAL;
>> +
>> +       val = readl(pll->base + ctrl->mdiv.offset);
>> +       if (div == 256) {
>> +               val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
>> +       } else {
>> +               val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
>> +               val |= div << ctrl->mdiv.shift;
>> +       }
>> +       writel(val, pll->base + ctrl->mdiv.offset);
>> +       clk->rate = parent_rate / div;
>> +
>> +       return 0;
>> +}
>> +
>> +static const struct clk_ops iproc_clk_ops = {
>> +       .enable = iproc_clk_enable,
>> +       .disable = iproc_clk_disable,
>> +       .recalc_rate = iproc_clk_recalc_rate,
>> +       .round_rate = iproc_clk_round_rate,
>> +       .set_rate = iproc_clk_set_rate,
>> +};
>> +
>> +void __init iproc_clk_setup(struct device_node *node,
>> +               const struct iproc_clk_ctrl *ctrl, unsigned int num_clks)
>> +{
>> +       int i, ret;
>> +       struct iproc_pll *pll;
>> +
>> +       if (WARN_ON(!ctrl))
>> +               return;
>> +
>> +       pll = kzalloc(sizeof(*pll), GFP_KERNEL);
>> +       if (WARN_ON(!pll))
>> +               return;
>> +
>> +       pll->clk_data.clk_num = num_clks;
>> +       pll->clk_data.clks = kcalloc(num_clks, sizeof(*pll->clk_data.clks),
>> +                       GFP_KERNEL);
>> +       if (WARN_ON(!pll->clk_data.clks))
>> +               goto err_clks;
>> +
>> +       pll->clks = kcalloc(num_clks, sizeof(*pll->clks), GFP_KERNEL);
>> +       if (WARN_ON(!pll->clks))
>> +               goto err_pll_clks;
>> +
>> +       pll->base = of_iomap(node, 0);
>> +       if (WARN_ON(!pll->base))
>> +               goto err_iomap;
>> +
>> +       for (i = 0; i < num_clks; i++) {
>> +               struct clk_init_data init;
>> +               struct clk *clk;
>> +               const char *parent_name;
>> +               struct iproc_clk *iclk;
>> +               const char *clk_name;
>> +
>> +               clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
>> +               if (WARN_ON(!clk_name))
>> +                       goto err_clk_register;
>> +
>> +               ret = of_property_read_string_index(node, "clock-output-names",
>> +                               i, &clk_name);
>> +               if (WARN_ON(ret))
>> +                       goto err_clk_register;
>> +
>> +               iclk = &pll->clks[i];
>> +               iclk->name = clk_name;
>> +               iclk->pll = pll;
>> +               iclk->ctrl = &ctrl[i];
>> +               init.name = clk_name;
>> +               init.ops = &iproc_clk_ops;
>> +               init.flags = 0;
>> +               parent_name = of_clk_get_parent_name(node, 0);
>> +               init.parent_names = (parent_name ? &parent_name : NULL);
>> +               init.num_parents = (parent_name ? 1 : 0);
>> +               iclk->hw.init = &init;
>> +
>> +               clk = clk_register(NULL, &iclk->hw);
>> +               if (WARN_ON(IS_ERR(clk)))
>> +                       goto err_clk_register;
>> +               pll->clk_data.clks[i] = clk;
>> +       }
>> +
>> +       ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
>> +       if (WARN_ON(ret))
>> +               goto err_clk_register;
>> +
>> +       return;
>> +
>> +err_clk_register:
>> +       for (i = 0; i < num_clks; i++)
>> +               kfree(pll->clks[i].name);
>> +       iounmap(pll->base);
>> +
>> +err_iomap:
>> +       kfree(pll->clks);
>> +
>> +err_pll_clks:
>> +       kfree(pll->clk_data.clks);
>> +
>> +err_clks:
>> +       kfree(pll);
>> +}
>> diff --git a/drivers/clk/bcm/clk-iproc-pll.c b/drivers/clk/bcm/clk-iproc-pll.c
>> new file mode 100644
>> index 0000000..cd3bd38
>> --- /dev/null
>> +++ b/drivers/clk/bcm/clk-iproc-pll.c
>> @@ -0,0 +1,483 @@
>> +/*
>> + * Copyright (C) 2014 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/err.h>
>> +#include <linux/clk-provider.h>
>> +#include <linux/io.h>
>> +#include <linux/of.h>
>> +#include <linux/clkdev.h>
>> +#include <linux/of_address.h>
>> +#include <linux/delay.h>
>> +
>> +#include "clk-iproc.h"
>> +
>> +#define PLL_VCO_HIGH_SHIFT 19
>> +#define PLL_VCO_LOW_SHIFT  30
>> +
>> +/* number of delay loops waiting for PLL to lock */
>> +#define LOCK_DELAY 100
>> +
>> +/* number of VCO frequency bands */
>> +#define NUM_FREQ_BANDS 8
>> +
>> +#define NUM_KP_BANDS 3
>> +enum kp_band {
>> +       KP_BAND_MID = 0,
>> +       KP_BAND_HIGH,
>> +       KP_BAND_HIGH_HIGH
>> +};
>> +
>> +static const unsigned int kp_table[NUM_KP_BANDS][NUM_FREQ_BANDS] = {
>> +       { 5, 6, 6, 7, 7, 8, 9, 10 },
>> +       { 4, 4, 5, 5, 6, 7, 8, 9  },
>> +       { 4, 5, 5, 6, 7, 8, 9, 10 },
>> +};
>> +
>> +static const unsigned long ref_freq_table[NUM_FREQ_BANDS][2] = {
>> +       { 10000000,  12500000  },
>> +       { 12500000,  15000000  },
>> +       { 15000000,  20000000  },
>> +       { 20000000,  25000000  },
>> +       { 25000000,  50000000  },
>> +       { 50000000,  75000000  },
>> +       { 75000000,  100000000 },
>> +       { 100000000, 125000000 },
>> +};
>> +
>> +enum vco_freq_range {
>> +       VCO_LOW       = 700000000U,
>> +       VCO_MID       = 1200000000U,
>> +       VCO_HIGH      = 2200000000U,
>> +       VCO_HIGH_HIGH = 3100000000U,
>> +       VCO_MAX       = 4000000000U,
>> +};
>> +
>> +struct iproc_pll {
>> +       struct clk_hw hw;
>> +       void __iomem *pll_base;
>> +       void __iomem *pwr_base;
>> +       void __iomem *asiu_base;
>> +       struct clk_onecell_data clk_data;
>> +       const char *name;
>> +       const struct iproc_pll_ctrl *ctrl;
>> +       const struct iproc_pll_vco_freq_param *vco_param;
>> +       unsigned int num_vco_entries;
>> +       unsigned long rate;
>> +};
>> +
>> +#define to_iproc_pll(hw) container_of(hw, struct iproc_pll, hw)
>> +
>> +/*
>> + * Get the clock rate based on name
>> + */
>> +static unsigned long __get_rate(const char *clk_name)
>> +{
>> +       struct clk *clk;
>> +
>> +       clk = __clk_lookup(clk_name);
>> +       if (!clk) {
>> +               pr_err("%s: unable to find clock by name: %s\n", __func__,
>> +                               clk_name);
>> +               return 0;
>> +       }
>> +
>> +       return clk_get_rate(clk);
>> +}
>> +
>> +/*
>> + * Based on the target frequency, find a match from the VCO frequency parameter
>> + * table and return its index
>> + */
>> +static int pll_get_rate_index(struct iproc_pll *pll, unsigned int target_rate)
>> +{
>> +       int i;
>> +
>> +       for (i = 0; i < pll->num_vco_entries; i++)
>> +               if (target_rate == pll->vco_param[i].rate)
>> +                       break;
>> +
>> +       if (i >= pll->num_vco_entries)
>> +               return -EINVAL;
>> +
>> +       return i;
>> +}
>> +
>> +static int get_kp(unsigned long ref_freq, enum kp_band kp_index)
>> +{
>> +       int i;
>> +
>> +       if (ref_freq < ref_freq_table[0][0])
>> +               return -EINVAL;
>> +
>> +       for (i = 0; i < NUM_FREQ_BANDS; i++) {
>> +               if (ref_freq >= ref_freq_table[i][0] &&
>> +                       ref_freq < ref_freq_table[i][1])
>> +                       return kp_table[kp_index][i];
>> +       }
>> +       return -EINVAL;
>> +}
>> +
>> +static int pll_wait_for_lock(struct iproc_pll *pll)
>> +{
>> +       int i;
>> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
>> +
>> +       for (i = 0; i < LOCK_DELAY; i++) {
>> +               u32 val = readl(pll->pll_base + ctrl->status.offset);
>> +
>> +               if (val & (1 << ctrl->status.shift))
>> +                       return 0;
>> +               udelay(10);
>> +       }
>> +
>> +       return -EIO;
>> +}
>> +
>> +static void __pll_disable(struct iproc_pll *pll)
>> +{
>> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
>> +       u32 val;
>> +
>> +       if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
>> +               val = readl(pll->asiu_base + ctrl->asiu.offset);
>> +               val &= ~(1 << ctrl->asiu.en_shift);
>> +               writel(val, pll->asiu_base + ctrl->asiu.offset);
>> +       }
>> +
>> +       /* latch input value so core power can be shut down */
>> +       val = readl(pll->pwr_base + ctrl->aon.offset);
>> +       val |= (1 << ctrl->aon.iso_shift);
>> +       writel(val, pll->pwr_base + ctrl->aon.offset);
>> +
>> +       /* power down the core */
>> +       val &= ~(bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift);
>> +       writel(val, pll->pwr_base + ctrl->aon.offset);
>> +}
>> +
>> +static int __pll_enable(struct iproc_pll *pll)
>> +{
>> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
>> +       u32 val;
>> +
>> +       /* power up the PLL and make sure it's not latched */
>> +       val = readl(pll->pwr_base + ctrl->aon.offset);
>> +       val |= bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift;
>> +       val &= ~(1 << ctrl->aon.iso_shift);
>> +       writel(val, pll->pwr_base + ctrl->aon.offset);
>> +
>> +       /* certain PLLs also need to be ungated from the ASIU top level */
>> +       if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
>> +               val = readl(pll->asiu_base + ctrl->asiu.offset);
>> +               val |= (1 << ctrl->asiu.en_shift);
>> +               writel(val, pll->asiu_base + ctrl->asiu.offset);
>> +       }
>> +
>> +       return 0;
>> +}
>> +
>> +static void __pll_put_in_reset(struct iproc_pll *pll)
>> +{
>> +       u32 val;
>> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
>> +       const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
>> +
>> +       val = readl(pll->pll_base + reset->offset);
>> +       val &= ~(1 << reset->reset_shift | 1 << reset->p_reset_shift);
>> +       writel(val, pll->pll_base + reset->offset);
>> +}
>> +
>> +static void __pll_bring_out_reset(struct iproc_pll *pll, unsigned int kp,
>> +               unsigned int ka, unsigned int ki)
>> +{
>> +       u32 val;
>> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
>> +       const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
>> +
>> +       val = readl(pll->pll_base + reset->offset);
>> +       val &= ~(bit_mask(reset->ki_width) << reset->ki_shift |
>> +               bit_mask(reset->kp_width) << reset->kp_shift |
>> +               bit_mask(reset->ka_width) << reset->ka_shift);
>> +       val |=  ki << reset->ki_shift | kp << reset->kp_shift |
>> +               ka << reset->ka_shift;
>> +       val |= 1 << reset->reset_shift | 1 << reset->p_reset_shift;
>> +       writel(val, pll->pll_base + reset->offset);
>> +}
>> +
>> +static int pll_set_rate(struct iproc_pll *pll, unsigned int rate_index,
>> +               unsigned long parent_rate)
>> +{
>> +       const struct iproc_pll_vco_freq_param *vco =
>> +                               &pll->vco_param[rate_index];
>> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
>> +       int ka = 0, ki, kp, ret;
>> +       unsigned long rate = vco->rate;
>> +       u32 val;
>> +       enum kp_band kp_index;
>> +       unsigned long ref_freq;
>> +
>> +       /*
>> +        * reference frequency = parent frequency / PDIV
>> +        * If PDIV = 0, then it becomes a multiplier (x2)
>> +        */
>> +       if (vco->pdiv == 0)
>> +               ref_freq = parent_rate * 2;
>> +       else
>> +               ref_freq = parent_rate / vco->pdiv;
>> +
>> +       /* determine Ki and Kp index based on target VCO frequency */
>> +       if (rate >= VCO_LOW && rate < VCO_HIGH) {
>> +               ki = 4;
>> +               kp_index = KP_BAND_MID;
>> +       } else if (rate >= VCO_HIGH && rate && rate < VCO_HIGH_HIGH) {
>> +               ki = 3;
>> +               kp_index = KP_BAND_HIGH;
>> +       } else if (rate >= VCO_HIGH_HIGH && rate < VCO_MAX) {
>> +               ki = 3;
>> +               kp_index = KP_BAND_HIGH_HIGH;
>> +       } else {
>> +               pr_err("%s: pll: %s has invalid rate: %lu\n", __func__,
>> +                               pll->name, rate);
>> +               return -EINVAL;
>> +       }
>> +
>> +       kp = get_kp(ref_freq, kp_index);
>> +       if (kp < 0) {
>> +               pr_err("%s: pll: %s has invalid kp\n", __func__, pll->name);
>> +               return kp;
>> +       }
>> +
>> +       ret = __pll_enable(pll);
>> +       if (ret) {
>> +               pr_err("%s: pll: %s fails to enable\n", __func__, pll->name);
>> +               return ret;
>> +       }
>> +
>> +       /* put PLL in reset */
>> +       __pll_put_in_reset(pll);
>> +
>> +       writel(0, pll->pll_base + ctrl->vco_ctrl.u_offset);
>> +       val = readl(pll->pll_base + ctrl->vco_ctrl.l_offset);
>> +
>> +       if (rate >= VCO_LOW && rate < VCO_MID)
>> +               val |= (1 << PLL_VCO_LOW_SHIFT);
>> +
>> +       if (rate < VCO_HIGH)
>> +               val &= ~(1 << PLL_VCO_HIGH_SHIFT);
>> +       else
>> +               val |= (1 << PLL_VCO_HIGH_SHIFT);
>> +
>> +       writel(val, pll->pll_base + ctrl->vco_ctrl.l_offset);
>> +
>> +       /* program integer part of NDIV */
>> +       val = readl(pll->pll_base + ctrl->ndiv_int.offset);
>> +       val &= ~(bit_mask(ctrl->ndiv_int.width) << ctrl->ndiv_int.shift);
>> +       val |= vco->ndiv_int << ctrl->ndiv_int.shift;
>> +       writel(val, pll->pll_base + ctrl->ndiv_int.offset);
>> +
>> +       /* program fractional part of NDIV */
>> +       if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
>> +               val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
>> +               val &= ~(bit_mask(ctrl->ndiv_frac.width) <<
>> +                               ctrl->ndiv_frac.shift);
>> +               val |= vco->ndiv_frac << ctrl->ndiv_frac.shift;
>> +               writel(val, pll->pll_base + ctrl->ndiv_frac.offset);
>> +       }
>> +
>> +       /* program PDIV */
>> +       val = readl(pll->pll_base + ctrl->pdiv.offset);
>> +       val &= ~(bit_mask(ctrl->pdiv.width) << ctrl->pdiv.shift);
>> +       val |= vco->pdiv << ctrl->pdiv.shift;
>> +       writel(val, pll->pll_base + ctrl->pdiv.offset);
>> +
>> +       __pll_bring_out_reset(pll, kp, ka, ki);
>> +
>> +       ret = pll_wait_for_lock(pll);
>> +       if (ret < 0) {
>> +               pr_err("%s: pll: %s failed to lock\n", __func__, pll->name);
>> +               return ret;
>> +       }
>> +
>> +       return 0;
>> +}
>> +
>> +static int iproc_pll_enable(struct clk_hw *hw)
>> +{
>> +       struct iproc_pll *pll = to_iproc_pll(hw);
>> +
>> +       return __pll_enable(pll);
>> +}
>> +
>> +static void iproc_pll_disable(struct clk_hw *hw)
>> +{
>> +       struct iproc_pll *pll = to_iproc_pll(hw);
>> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
>> +
>> +       if (ctrl->flags & IPROC_CLK_AON)
>> +               return;
>> +
>> +       __pll_disable(pll);
>> +}
>> +
>> +static unsigned long iproc_pll_recalc_rate(struct clk_hw *hw,
>> +       unsigned long parent_rate)
>> +{
>> +       struct iproc_pll *pll = to_iproc_pll(hw);
>> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
>> +       u32 val;
>> +       u64 ndiv;
>> +       unsigned int ndiv_int, ndiv_frac, pdiv;
>> +
>> +       if (parent_rate == 0)
>> +               return 0;
>> +
>> +       /* PLL needs to be locked */
>> +       val = readl(pll->pll_base + ctrl->status.offset);
>> +       if ((val & (1 << ctrl->status.shift)) == 0) {
>> +               pll->rate = 0;
>> +               return 0;
>> +       }
>> +
>> +       /*
>> +        * PLL output frequency =
>> +        *
>> +        * ((ndiv_int + ndiv_frac / 2^20) * (parent clock rate / pdiv)
>> +        */
>> +       val = readl(pll->pll_base + ctrl->ndiv_int.offset);
>> +       ndiv_int = (val >> ctrl->ndiv_int.shift) &
>> +               bit_mask(ctrl->ndiv_int.width);
>> +       ndiv = ndiv_int << ctrl->ndiv_int.shift;
>> +
>> +       if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
>> +               val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
>> +               ndiv_frac = (val >> ctrl->ndiv_frac.shift) &
>> +                       bit_mask(ctrl->ndiv_frac.width);
>> +
>> +               if (ndiv_frac != 0)
>> +                       ndiv = (ndiv_int << ctrl->ndiv_int.shift) | ndiv_frac;
>> +       }
>> +
>> +       val = readl(pll->pll_base + ctrl->pdiv.offset);
>> +       pdiv = (val >> ctrl->pdiv.shift) & bit_mask(ctrl->pdiv.width);
>> +
>> +       pll->rate = (ndiv * parent_rate) >> ctrl->ndiv_int.shift;
>> +
>> +       if (pdiv == 0)
>> +               pll->rate *= 2;
>> +       else
>> +               pll->rate /= pdiv;
>> +
>> +       return pll->rate;
>> +}
>> +
>> +static const struct clk_ops iproc_pll_ops = {
>> +       .enable = iproc_pll_enable,
>> +       .disable = iproc_pll_disable,
>> +       .recalc_rate = iproc_pll_recalc_rate,
>> +};
>> +
>> +void __init iproc_pll_setup(struct device_node *node,
>> +               const struct iproc_pll_ctrl *ctrl,
>> +               const struct iproc_pll_vco_freq_param *vco_param,
>> +               unsigned int num_vco_entries)
>> +{
>> +       int ret;
>> +       struct clk *clk;
>> +       struct iproc_pll *pll;
>> +       struct clk_init_data init;
>> +       const char *parent_name;
>> +       unsigned int rate;
>> +
>> +       if (WARN_ON(!ctrl))
>> +               return;
>> +
>> +       pll = kzalloc(sizeof(*pll), GFP_KERNEL);
>> +       if (WARN_ON(!pll))
>> +               return;
>> +
>> +       pll->pll_base = of_iomap(node, 0);
>> +       if (WARN_ON(!pll->pll_base))
>> +               goto err_pll_iomap;
>> +
>> +       pll->pwr_base = of_iomap(node, 1);
>> +       if (WARN_ON(!pll->pwr_base))
>> +               goto err_pwr_iomap;
>> +
>> +       /* some PLLs require gating control at the top ASIU level */
>> +       if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
>> +               pll->asiu_base = of_iomap(node, 2);
>> +               if (WARN_ON(!pll->asiu_base))
>> +                       goto err_asiu_iomap;
>> +       }
>> +
>> +       pll->ctrl = ctrl;
>> +       pll->name = node->name;
>> +       init.name = node->name;
>> +       init.ops = &iproc_pll_ops;
>> +       init.flags = 0;
>> +       parent_name = of_clk_get_parent_name(node, 0);
>> +       init.parent_names = (parent_name ? &parent_name : NULL);
>> +       init.num_parents = (parent_name ? 1 : 0);
>> +       pll->hw.init = &init;
>> +
>> +       /* configure the PLL to the desired VCO frequency if specified */
>> +       ret = of_property_read_u32(node, "clock-frequency", &rate);
>> +       if (!ret) {
>> +               unsigned long parent_rate;
>> +               int rate_index;
>> +
>> +               if (WARN_ON(!vco_param))
>> +                       goto err_clk_register;
>> +
>> +               pll->num_vco_entries = num_vco_entries;
>> +               pll->vco_param = vco_param;
>> +
>> +               parent_rate = __get_rate(parent_name);
>> +               if (WARN_ON(!parent_rate))
>> +                       goto err_clk_register;
>> +
>> +               rate_index = pll_get_rate_index(pll, rate);
>> +               if (WARN_ON(rate_index < 0))
>> +                       goto err_clk_register;
>> +
>> +               ret = pll_set_rate(pll, rate_index, parent_rate);
>> +               if (WARN_ON(ret))
>> +                       goto err_clk_register;
>> +       }
>> +
>> +       clk = clk_register(NULL, &pll->hw);
>> +       if (WARN_ON(IS_ERR(clk)))
>> +               goto err_clk_register;
>> +
>> +       pll->clk_data.clk_num = 1;
>> +       pll->clk_data.clks = &clk;
>> +
>> +       ret = of_clk_add_provider(node, of_clk_src_onecell_get,
>> +                       &pll->clk_data);
>> +       if (WARN_ON(ret))
>> +               goto err_clk_add;
>> +
>> +       return;
>> +
>> +err_clk_add:
>> +       clk_unregister(clk);
>> +err_clk_register:
>> +       if (pll->asiu_base)
>> +               iounmap(pll->asiu_base);
>> +err_asiu_iomap:
>> +       iounmap(pll->pwr_base);
>> +err_pwr_iomap:
>> +       iounmap(pll->pll_base);
>> +err_pll_iomap:
>> +       kfree(pll);
>> +}
>> diff --git a/drivers/clk/bcm/clk-iproc.h b/drivers/clk/bcm/clk-iproc.h
>> new file mode 100644
>> index 0000000..4aa0479
>> --- /dev/null
>> +++ b/drivers/clk/bcm/clk-iproc.h
>> @@ -0,0 +1,155 @@
>> +/*
>> + * Copyright (C) 2014 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#ifndef _CLK_IPROC_H
>> +#define _CLK_IPROC_H
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/list.h>
>> +#include <linux/spinlock.h>
>> +#include <linux/slab.h>
>> +#include <linux/device.h>
>> +#include <linux/of.h>
>> +#include <linux/clk-provider.h>
>> +
>> +#define IPROC_CLK_NAME_LEN 25
>> +#define IPROC_CLK_INVALID_OFFSET 0xffffffff
>> +#define bit_mask(width) ((1 << (width)) - 1)
>> +
>> +/* clock should not be disabled at runtime */
>> +#define IPROC_CLK_AON BIT(0)
>> +
>> +/* PLL requires gating through ASIU */
>> +#define IPROC_CLK_PLL_ASIU BIT(1)
>> +
>> +/* PLL has fractional part of the NDIV */
>> +#define IPROC_CLK_PLL_HAS_NDIV_FRAC BIT(2)
>> +
>> +/*
>> + * Parameters for VCO frequency configuration
>> + *
>> + * VCO frequency =
>> + * ((ndiv_int + ndiv_frac / 2^20) * (ref freqeuncy  / pdiv)
>> + */
>> +struct iproc_pll_vco_freq_param {
>> +       unsigned long rate;
>> +       unsigned int ndiv_int;
>> +       unsigned int ndiv_frac;
>> +       unsigned int pdiv;
>> +};
>> +
>> +struct iproc_clk_reg_op {
>> +       unsigned int offset;
>> +       unsigned int shift;
>> +       unsigned int width;
>> +};
>> +
>> +/*
>> + * Clock gating control at the top ASIU level
>> + */
>> +struct iproc_asiu_gate {
>> +       unsigned int offset;
>> +       unsigned int en_shift;
>> +};
>> +
>> +/*
>> + * Control of powering on/off of a PLL
>> + *
>> + * Before powering off a PLL, input isolation (ISO) needs to be enabled
>> + */
>> +struct iproc_pll_aon_pwr_ctrl {
>> +       unsigned int offset;
>> +       unsigned int pwr_width;
>> +       unsigned int pwr_shift;
>> +       unsigned int iso_shift;
>> +};
>> +
>> +/*
>> + * Control of the PLL reset, with Ki, Kp, and Ka parameters
>> + */
>> +struct iproc_pll_reset_ctrl {
>> +       unsigned int offset;
>> +       unsigned int reset_shift;
>> +       unsigned int p_reset_shift;
>> +       unsigned int ki_shift;
>> +       unsigned int ki_width;
>> +       unsigned int kp_shift;
>> +       unsigned int kp_width;
>> +       unsigned int ka_shift;
>> +       unsigned int ka_width;
>> +};
>> +
>> +struct iproc_pll_vco_ctrl {
>> +       unsigned int u_offset;
>> +       unsigned int l_offset;
>> +};
>> +
>> +/*
>> + * Main PLL control parameters
>> + */
>> +struct iproc_pll_ctrl {
>> +       unsigned long flags;
>> +       struct iproc_pll_aon_pwr_ctrl aon;
>> +       struct iproc_asiu_gate asiu;
>> +       struct iproc_pll_reset_ctrl reset;
>> +       struct iproc_clk_reg_op ndiv_int;
>> +       struct iproc_clk_reg_op ndiv_frac;
>> +       struct iproc_clk_reg_op pdiv;
>> +       struct iproc_pll_vco_ctrl vco_ctrl;
>> +       struct iproc_clk_reg_op status;
>> +};
>> +
>> +/*
>> + * Controls enabling/disabling a PLL derived clock
>> + */
>> +struct iproc_clk_enable_ctrl {
>> +       unsigned int offset;
>> +       unsigned int enable_shift;
>> +       unsigned int hold_shift;
>> +       unsigned int bypass_shift;
>> +};
>> +
>> +/*
>> + * Main clock control parameters for clocks derived from the PLLs
>> + */
>> +struct iproc_clk_ctrl {
>> +       unsigned int channel;
>> +       unsigned long flags;
>> +       struct iproc_clk_enable_ctrl enable;
>> +       struct iproc_clk_reg_op mdiv;
>> +};
>> +
>> +/*
>> + * Divisor of the ASIU clocks
>> + */
>> +struct iproc_asiu_div {
>> +       unsigned int offset;
>> +       unsigned int en_shift;
>> +       unsigned int high_shift;
>> +       unsigned int high_width;
>> +       unsigned int low_shift;
>> +       unsigned int low_width;
>> +};
>> +
>> +extern void __init iproc_armpll_setup(struct device_node *node);
>> +extern void __init iproc_pll_setup(struct device_node *node,
>> +               const struct iproc_pll_ctrl *ctrl,
>> +               const struct iproc_pll_vco_freq_param *vco_param,
>> +               unsigned int num_freqs);
>> +extern void __init iproc_clk_setup(struct device_node *node,
>> +               const struct iproc_clk_ctrl *ctrl, unsigned int num_clks);
>> +extern void __init iproc_asiu_setup(struct device_node *node,
>> +               const struct iproc_asiu_div *div,
>> +               const struct iproc_asiu_gate *gate, unsigned int num_clks);
>> +
>> +#endif /* _CLK_IPROC_H */
>> --
>> 1.7.9.5
>>
>>
>> _______________________________________________
>> linux-arm-kernel mailing list
>> linux-arm-kernel@lists.infradead.org
>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Re: [PATCH 2/4] clk: iproc: add initial common clock support

[Ray Jui]

On 12/6/2014 2:20 PM, Tim Kryger wrote:
> On Thu, Dec 4, 2014 at 1:43 PM, Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org> wrote:
>> This adds basic and generic support for various iProc PLLs and clocks
>> including the ARMPLL, GENPLL, LCPLL, MIPIPLL, and ASIU clocks.
>>
>> SoCs under the iProc architecture can define their specific register
>> offsets and clock parameters for their PLL and clock controllers. These
>> parameters can be passed as arugments into the generic iProc PLL and
>> clock setup functions
>>
>> Derived from code originally provided by Jonathan Richardson
>> <jonathar-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>>
>> Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>> Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>> ---
>>   drivers/clk/Makefile               |    2 +-
>>   drivers/clk/bcm/Kconfig            |    9 +
>>   drivers/clk/bcm/Makefile           |    1 +
>>   drivers/clk/bcm/clk-iproc-armpll.c |  286 +++++++++++++++++++++
>>   drivers/clk/bcm/clk-iproc-asiu.c   |  275 ++++++++++++++++++++
>>   drivers/clk/bcm/clk-iproc-clk.c    |  238 ++++++++++++++++++
>>   drivers/clk/bcm/clk-iproc-pll.c    |  483 ++++++++++++++++++++++++++++++++++++
>>   drivers/clk/bcm/clk-iproc.h        |  155 ++++++++++++
>>   8 files changed, 1448 insertions(+), 1 deletion(-)
>>   create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
>>   create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
>>   create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
>>   create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
>>   create mode 100644 drivers/clk/bcm/clk-iproc.h
>>
>> diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
>> index d5fba5b..eff0213 100644
>> --- a/drivers/clk/Makefile
>> +++ b/drivers/clk/Makefile
>> @@ -41,7 +41,7 @@ obj-$(CONFIG_ARCH_VT8500)             += clk-vt8500.o
>>   obj-$(CONFIG_COMMON_CLK_WM831X)                += clk-wm831x.o
>>   obj-$(CONFIG_COMMON_CLK_XGENE)         += clk-xgene.o
>>   obj-$(CONFIG_COMMON_CLK_AT91)          += at91/
>> -obj-$(CONFIG_ARCH_BCM_MOBILE)          += bcm/
>> +obj-$(CONFIG_ARCH_BCM)                 += bcm/
>>   obj-$(CONFIG_ARCH_BERLIN)              += berlin/
>>   obj-$(CONFIG_ARCH_HI3xxx)              += hisilicon/
>>   obj-$(CONFIG_ARCH_HIP04)               += hisilicon/
>
> It may be best to move the above change into its own commit.
>
Okay. Will make this change along with other changes if required. Still 
waiting for more code review comments at this point.

>> diff --git a/drivers/clk/bcm/Kconfig b/drivers/clk/bcm/Kconfig
>> index 75506e5..66b5b7f 100644
>> --- a/drivers/clk/bcm/Kconfig
>> +++ b/drivers/clk/bcm/Kconfig
>> @@ -7,3 +7,12 @@ config CLK_BCM_KONA
>>            Enable common clock framework support for Broadcom SoCs
>>            using "Kona" style clock control units, including those
>>            in the BCM281xx and BCM21664 families.
>> +
>> +config COMMON_CLK_IPROC
>> +       bool "Broadcom iProc clock support"
>> +       depends on ARCH_BCM_IPROC
>> +       depends on COMMON_CLK
>> +       default y
>> +       help
>> +         Enable common clock framework support for Broadcom SoCs
>> +         based on the "iProc" architecture
>> diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
>> index 6297d05..6926636 100644
>> --- a/drivers/clk/bcm/Makefile
>> +++ b/drivers/clk/bcm/Makefile
>> @@ -2,3 +2,4 @@ obj-$(CONFIG_CLK_BCM_KONA)      += clk-kona.o
>>   obj-$(CONFIG_CLK_BCM_KONA)     += clk-kona-setup.o
>>   obj-$(CONFIG_CLK_BCM_KONA)     += clk-bcm281xx.o
>>   obj-$(CONFIG_CLK_BCM_KONA)     += clk-bcm21664.o
>> +obj-$(CONFIG_COMMON_CLK_IPROC) += clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
>> diff --git a/drivers/clk/bcm/clk-iproc-armpll.c b/drivers/clk/bcm/clk-iproc-armpll.c
>> new file mode 100644
>> index 0000000..ec9b130
>> --- /dev/null
>> +++ b/drivers/clk/bcm/clk-iproc-armpll.c
>> @@ -0,0 +1,286 @@
>> +/*
>> + * Copyright (C) 2014 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/slab.h>
>> +#include <linux/err.h>
>> +#include <linux/clk-provider.h>
>> +#include <linux/io.h>
>> +#include <linux/of.h>
>> +#include <linux/clkdev.h>
>> +#include <linux/of_address.h>
>> +
>> +#define IPROC_CLK_MAX_FREQ_POLICY                    0x3
>> +#define IPROC_CLK_POLICY_FREQ_OFFSET                 0x008
>> +#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT      8
>> +#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK       0x7
>> +
>> +#define IPROC_CLK_PLLARMA_OFFSET                     0xc00
>> +#define IPROC_CLK_PLLARMA_LOCK_SHIFT                 28
>> +#define IPROC_CLK_PLLARMA_PDIV_SHIFT                 24
>> +#define IPROC_CLK_PLLARMA_PDIV_MASK                  0xf
>> +#define IPROC_CLK_PLLARMA_NDIV_INT_SHIFT             8
>> +#define IPROC_CLK_PLLARMA_NDIV_INT_MASK              0x3ff
>> +
>> +#define IPROC_CLK_PLLARMB_OFFSET                     0xc04
>> +#define IPROC_CLK_PLLARMB_NDIV_FRAC_MASK             0xfffff
>> +
>> +#define IPROC_CLK_PLLARMC_OFFSET                     0xc08
>> +#define IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT            8
>> +#define IPROC_CLK_PLLARMC_MDIV_MASK                  0xff
>> +
>> +#define IPROC_CLK_PLLARMCTL5_OFFSET                  0xc20
>> +#define IPROC_CLK_PLLARMCTL5_H_MDIV_MASK             0xff
>> +
>> +#define IPROC_CLK_PLLARM_OFFSET_OFFSET               0xc24
>> +#define IPROC_CLK_PLLARM_SW_CTL_SHIFT                29
>> +#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT       20
>> +#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK        0xff
>> +#define IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK       0xfffff
>> +
>> +#define IPROC_CLK_ARM_DIV_OFFSET                     0xe00
>> +#define IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT  4
>> +#define IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK        0xf
>> +
>> +#define IPROC_CLK_POLICY_DBG_OFFSET                  0xec0
>> +#define IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT          12
>> +#define IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK           0x7
>> +
>> +enum iproc_arm_pll_fid {
>> +       ARM_PLL_FID_CRYSTAL_CLK   = 0,
>> +       ARM_PLL_FID_SYS_CLK       = 2,
>> +       ARM_PLL_FID_CH0_SLOW_CLK  = 6,
>> +       ARM_PLL_FID_CH1_FAST_CLK  = 7
>> +};
>> +
>> +struct iproc_arm_pll {
>> +       struct clk_hw hw;
>> +       void __iomem *base;
>> +       struct clk_onecell_data clk_data;
>> +       unsigned long rate;
>> +};
>> +
>> +#define to_iproc_arm_pll(hw) container_of(hw, struct iproc_arm_pll, hw)
>> +
>> +static unsigned int __get_fid(struct iproc_arm_pll *pll)
>> +{
>> +       u32 val;
>> +       unsigned int policy, fid, active_fid;
>> +
>> +       val = readl(pll->base + IPROC_CLK_ARM_DIV_OFFSET);
>> +       if (val & (1 << IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT))
>> +               policy = val & IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK;
>> +       else
>> +               policy = 0;
>> +
>> +       /* something is seriously wrong */
>> +       BUG_ON(policy > IPROC_CLK_MAX_FREQ_POLICY);
>> +
>> +       val = readl(pll->base + IPROC_CLK_POLICY_FREQ_OFFSET);
>> +       fid = (val >> (IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT * policy)) &
>> +               IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK;
>> +
>> +       val = readl(pll->base + IPROC_CLK_POLICY_DBG_OFFSET);
>> +       active_fid = IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK &
>> +               (val >> IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT);
>> +       if (fid != active_fid) {
>> +               pr_debug("%s: fid override %u->%u\n", __func__, fid,
>> +                               active_fid);
>> +               fid = active_fid;
>> +       }
>> +
>> +       pr_debug("%s: active fid: %u\n", __func__, fid);
>> +
>> +       return fid;
>> +}
>> +
>> +/*
>> + * Determine the mdiv (post divider) based on the frequency ID being used.
>> + * There are 4 sources that can be used to derive the output clock rate:
>> + *    - 25 MHz Crystal
>> + *    - System clock
>> + *    - PLL channel 0 (slow clock)
>> + *    - PLL channel 1 (fast clock)
>> + */
>> +static int __get_mdiv(struct iproc_arm_pll *pll)
>> +{
>> +       unsigned int fid;
>> +       int mdiv;
>> +       u32 val;
>> +
>> +       fid = __get_fid(pll);
>> +
>> +       switch (fid) {
>> +       case ARM_PLL_FID_CRYSTAL_CLK:
>> +       case ARM_PLL_FID_SYS_CLK:
>> +               mdiv = 1;
>> +               break;
>> +
>> +       case ARM_PLL_FID_CH0_SLOW_CLK:
>> +               val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
>> +               mdiv = val & IPROC_CLK_PLLARMC_MDIV_MASK;
>> +               if (mdiv == 0)
>> +                       mdiv = 256;
>> +               break;
>> +
>> +       case ARM_PLL_FID_CH1_FAST_CLK:
>> +               val = readl(pll->base + IPROC_CLK_PLLARMCTL5_OFFSET);
>> +               mdiv = val & IPROC_CLK_PLLARMCTL5_H_MDIV_MASK;
>> +               if (mdiv == 0)
>> +                       mdiv = 256;
>> +               break;
>> +
>> +       default:
>> +               mdiv = -EFAULT;
>> +       }
>> +
>> +       return mdiv;
>> +}
>> +
>> +static unsigned int __get_ndiv(struct iproc_arm_pll *pll)
>> +{
>> +       u32 val;
>> +       unsigned int ndiv_int, ndiv_frac, ndiv;
>> +
>> +       val = readl(pll->base + IPROC_CLK_PLLARM_OFFSET_OFFSET);
>> +       if (val & (1 << IPROC_CLK_PLLARM_SW_CTL_SHIFT)) {
>> +               /*
>> +                * offset mode is active. Read the ndiv from the PLLARM OFFSET
>> +                * register
>> +                */
>> +               ndiv_int = (val >> IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT) &
>> +                       IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK;
>> +               if (ndiv_int == 0)
>> +                       ndiv_int = 256;
>> +
>> +               ndiv_frac = val & IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK;
>> +       } else {
>> +               /* offset mode not active */
>> +               val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
>> +               ndiv_int = (val >> IPROC_CLK_PLLARMA_NDIV_INT_SHIFT) &
>> +                       IPROC_CLK_PLLARMA_NDIV_INT_MASK;
>> +               if (ndiv_int == 0)
>> +                       ndiv_int = 1024;
>> +
>> +               val = readl(pll->base + IPROC_CLK_PLLARMB_OFFSET);
>> +               ndiv_frac = val & IPROC_CLK_PLLARMB_NDIV_FRAC_MASK;
>> +       }
>> +
>> +       ndiv = (ndiv_int << 20) | ndiv_frac;
>> +
>> +       return ndiv;
>> +}
>> +
>> +/*
>> + * The output frequency of the ARM PLL is calculated based on the ARM PLL
>> + * divider values:
>> + *   pdiv = ARM PLL pre-divider
>> + *   ndiv = ARM PLL multiplier
>> + *   mdiv = ARM PLL post divider
>> + *
>> + * The frequency is calculated by:
>> + *   ((ndiv * parent clock rate) / pdiv) / mdiv
>> + */
>> +static unsigned long iproc_arm_pll_recalc_rate(struct clk_hw *hw,
>> +               unsigned long parent_rate)
>> +{
>> +       struct iproc_arm_pll *pll = to_iproc_arm_pll(hw);
>> +       u32 val;
>> +       int mdiv;
>> +       u64 ndiv;
>> +       unsigned int pdiv;
>> +
>> +       /* in bypass mode, use parent rate */
>> +       val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
>> +       if (val & (1 << IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT)) {
>> +               pll->rate = parent_rate;
>> +               return pll->rate;
>> +       }
>> +
>> +       /* PLL needs to be locked */
>> +       val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
>> +       if (!(val & (1 << IPROC_CLK_PLLARMA_LOCK_SHIFT))) {
>> +               pll->rate = 0;
>> +               return 0;
>> +       }
>> +
>> +       pdiv = (val >> IPROC_CLK_PLLARMA_PDIV_SHIFT) &
>> +               IPROC_CLK_PLLARMA_PDIV_MASK;
>> +       if (pdiv == 0)
>> +               pdiv = 16;
>> +
>> +       ndiv = __get_ndiv(pll);
>> +       mdiv = __get_mdiv(pll);
>> +       if (mdiv <= 0) {
>> +               pll->rate = 0;
>> +               return 0;
>> +       }
>> +       pll->rate = (ndiv * parent_rate) >> 20;
>> +       pll->rate = (pll->rate / pdiv) / mdiv;
>> +
>> +       pr_debug("%s: ARM PLL rate: %lu. parent rate: %lu\n", __func__,
>> +                       pll->rate, parent_rate);
>> +       pr_debug("%s: ndiv_int: %u, pdiv: %u, mdiv: %d\n", __func__,
>> +                       (unsigned int)(ndiv >> 20), pdiv, mdiv);
>> +
>> +       return pll->rate;
>> +}
>> +
>> +static const struct clk_ops iproc_arm_pll_ops = {
>> +       .recalc_rate = iproc_arm_pll_recalc_rate,
>> +};
>> +
>> +void __init iproc_armpll_setup(struct device_node *node)
>> +{
>> +       int ret;
>> +       struct clk *clk;
>> +       struct iproc_arm_pll *pll;
>> +       struct clk_init_data init;
>> +       const char *parent_name;
>> +
>> +       pll = kzalloc(sizeof(*pll), GFP_KERNEL);
>> +       if (WARN_ON(!pll))
>> +               return;
>> +
>> +       pll->base = of_iomap(node, 0);
>> +       if (WARN_ON(!pll->base))
>> +               goto err_free_pll;
>> +
>> +       init.name = node->name;
>> +       init.ops = &iproc_arm_pll_ops;
>> +       init.flags = 0;
>> +       parent_name = of_clk_get_parent_name(node, 0);
>> +       init.parent_names = (parent_name ? &parent_name : NULL);
>> +       init.num_parents = (parent_name ? 1 : 0);
>> +       pll->hw.init = &init;
>> +
>> +       clk = clk_register(NULL, &pll->hw);
>> +       if (WARN_ON(IS_ERR(clk)))
>> +               goto err_iounmap;
>> +
>> +       pll->clk_data.clk_num = 1;
>> +       pll->clk_data.clks = &clk;
>> +
>> +       ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
>> +       if (WARN_ON(ret))
>> +               goto err_clk_unregister;
>> +
>> +       return;
>> +
>> +err_clk_unregister:
>> +       clk_unregister(clk);
>> +err_iounmap:
>> +       iounmap(pll->base);
>> +err_free_pll:
>> +       kfree(pll);
>> +}
>> diff --git a/drivers/clk/bcm/clk-iproc-asiu.c b/drivers/clk/bcm/clk-iproc-asiu.c
>> new file mode 100644
>> index 0000000..ab86b8c
>> --- /dev/null
>> +++ b/drivers/clk/bcm/clk-iproc-asiu.c
>> @@ -0,0 +1,275 @@
>> +/*
>> + * Copyright (C) 2014 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/err.h>
>> +#include <linux/clk-provider.h>
>> +#include <linux/io.h>
>> +#include <linux/of.h>
>> +#include <linux/clkdev.h>
>> +#include <linux/of_address.h>
>> +#include <linux/delay.h>
>> +
>> +#include "clk-iproc.h"
>> +
>> +struct iproc_asiu;
>> +
>> +struct iproc_asiu_clk {
>> +       struct clk_hw hw;
>> +       const char *name;
>> +       struct iproc_asiu *asiu;
>> +       unsigned long rate;
>> +       struct iproc_asiu_div div;
>> +       struct iproc_asiu_gate gate;
>> +};
>> +
>> +struct iproc_asiu {
>> +       void __iomem *div_base;
>> +       void __iomem *gate_base;
>> +
>> +       struct clk_onecell_data clk_data;
>> +       struct iproc_asiu_clk *clks;
>> +};
>> +
>> +#define to_asiu_clk(hw) container_of(hw, struct iproc_asiu_clk, hw)
>> +
>> +static int iproc_asiu_clk_enable(struct clk_hw *hw)
>> +{
>> +       struct iproc_asiu_clk *clk = to_asiu_clk(hw);
>> +       struct iproc_asiu *asiu = clk->asiu;
>> +       u32 val;
>> +
>> +       /* some clocks at the ASIU level are always enabled */
>> +       if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
>> +               return 0;
>> +
>> +       val = readl(asiu->gate_base + clk->gate.offset);
>> +       val |= (1 << clk->gate.en_shift);
>> +       writel(val, asiu->gate_base + clk->gate.offset);
>> +
>> +       return 0;
>> +}
>> +
>> +static void iproc_asiu_clk_disable(struct clk_hw *hw)
>> +{
>> +       struct iproc_asiu_clk *clk = to_asiu_clk(hw);
>> +       struct iproc_asiu *asiu = clk->asiu;
>> +       u32 val;
>> +
>> +       /* some clocks at the ASIU level are always enabled */
>> +       if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
>> +               return;
>> +
>> +       val = readl(asiu->gate_base + clk->gate.offset);
>> +       val &= ~(1 << clk->gate.en_shift);
>> +       writel(val, asiu->gate_base + clk->gate.offset);
>> +}
>> +
>> +static unsigned long iproc_asiu_clk_recalc_rate(struct clk_hw *hw,
>> +               unsigned long parent_rate)
>> +{
>> +       struct iproc_asiu_clk *clk = to_asiu_clk(hw);
>> +       struct iproc_asiu *asiu = clk->asiu;
>> +       u32 val;
>> +       unsigned int div_h, div_l;
>> +
>> +       if (parent_rate == 0) {
>> +               clk->rate = 0;
>> +               return 0;
>> +       }
>> +
>> +       /* if clock divisor is not enabled, simply return parent rate */
>> +       val = readl(asiu->div_base + clk->div.offset);
>> +       if ((val & (1 << clk->div.en_shift)) == 0) {
>> +               clk->rate = parent_rate;
>> +               return parent_rate;
>> +       }
>> +
>> +       /* clock rate = parent rate / (high_div + 1) + (low_div + 1) */
>> +       div_h = (val >> clk->div.high_shift) & bit_mask(clk->div.high_width);
>> +       div_h++;
>> +       div_l = (val >> clk->div.low_shift) & bit_mask(clk->div.low_width);
>> +       div_l++;
>> +
>> +       clk->rate = parent_rate / (div_h + div_l);
>> +       pr_debug("%s: rate: %lu. parent rate: %lu div_h: %u div_l: %u\n",
>> +               __func__, clk->rate, parent_rate, div_h, div_l);
>> +
>> +       return clk->rate;
>> +}
>> +
>> +static long iproc_asiu_clk_round_rate(struct clk_hw *hw, unsigned long rate,
>> +               unsigned long *parent_rate)
>> +{
>> +       unsigned int div;
>> +
>> +       if (rate == 0 || *parent_rate == 0)
>> +               return -EINVAL;
>> +
>> +       if (rate == *parent_rate)
>> +               return *parent_rate;
>> +
>> +       div = DIV_ROUND_UP(*parent_rate, rate);
>> +       if (div < 2)
>> +               return *parent_rate;
>> +
>> +       return *parent_rate / div;
>> +}
>> +
>> +static int iproc_asiu_clk_set_rate(struct clk_hw *hw, unsigned long rate,
>> +               unsigned long parent_rate)
>> +{
>> +       struct iproc_asiu_clk *clk = to_asiu_clk(hw);
>> +       struct iproc_asiu *asiu = clk->asiu;
>> +       unsigned int div, div_h, div_l;
>> +       u32 val;
>> +
>> +       if (rate == 0 || parent_rate == 0)
>> +               return -EINVAL;
>> +
>> +       /* simply disable the divisor if one wants the same rate as parent */
>> +       if (rate == parent_rate) {
>> +               val = readl(asiu->div_base + clk->div.offset);
>> +               val &= ~(1 << clk->div.en_shift);
>> +               writel(val, asiu->div_base + clk->div.offset);
>> +               return 0;
>> +       }
>> +
>> +       div = DIV_ROUND_UP(parent_rate, rate);
>> +       if (div < 2)
>> +               return -EINVAL;
>> +
>> +       div_h = div_l = div >> 1;
>> +       div_h--;
>> +       div_l--;
>> +
>> +       val = readl(asiu->div_base + clk->div.offset);
>> +       val |= 1 << clk->div.en_shift;
>> +       if (div_h) {
>> +               val &= ~(bit_mask(clk->div.high_width)
>> +                               << clk->div.high_shift);
>> +               val |= div_h << clk->div.high_shift;
>> +       } else {
>> +               val &= ~(bit_mask(clk->div.high_width)
>> +                               << clk->div.high_shift);
>> +       }
>> +       if (div_l) {
>> +               val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
>> +               val |= div_l << clk->div.low_shift;
>> +       } else {
>> +               val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
>> +       }
>> +       writel(val, asiu->div_base + clk->div.offset);
>> +
>> +       return 0;
>> +}
>> +
>> +static const struct clk_ops iproc_asiu_ops = {
>> +       .enable = iproc_asiu_clk_enable,
>> +       .disable = iproc_asiu_clk_disable,
>> +       .recalc_rate = iproc_asiu_clk_recalc_rate,
>> +       .round_rate = iproc_asiu_clk_round_rate,
>> +       .set_rate = iproc_asiu_clk_set_rate,
>> +};
>> +
>> +void __init iproc_asiu_setup(struct device_node *node,
>> +               const struct iproc_asiu_div *div,
>> +               const struct iproc_asiu_gate *gate, unsigned int num_clks)
>> +{
>> +       int i, ret;
>> +       struct iproc_asiu *asiu;
>> +
>> +       if (WARN_ON(!gate || !div))
>> +               return;
>> +
>> +       asiu = kzalloc(sizeof(*asiu), GFP_KERNEL);
>> +       if (WARN_ON(!asiu))
>> +               return;
>> +
>> +       asiu->clk_data.clk_num = num_clks;
>> +       asiu->clk_data.clks = kcalloc(num_clks, sizeof(*asiu->clk_data.clks),
>> +                       GFP_KERNEL);
>> +       if (WARN_ON(!asiu->clk_data.clks))
>> +               goto err_clks;
>> +
>> +       asiu->clks = kcalloc(num_clks, sizeof(*asiu->clks), GFP_KERNEL);
>> +       if (WARN_ON(!asiu->clks))
>> +               goto err_asiu_clks;
>> +
>> +       asiu->div_base = of_iomap(node, 0);
>> +       if (WARN_ON(!asiu->div_base))
>> +               goto err_iomap_div;
>> +
>> +       asiu->gate_base = of_iomap(node, 1);
>> +       if (WARN_ON(!asiu->gate_base))
>> +               goto err_iomap_gate;
>> +
>> +       for (i = 0; i < num_clks; i++) {
>> +               struct clk_init_data init;
>> +               struct clk *clk;
>> +               const char *parent_name;
>> +               struct iproc_asiu_clk *asiu_clk;
>> +               const char *clk_name;
>> +
>> +               clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
>> +               if (WARN_ON(!clk_name))
>> +                       goto err_clk_register;
>> +
>> +               ret = of_property_read_string_index(node, "clock-output-names",
>> +                               i, &clk_name);
>> +               if (WARN_ON(ret))
>> +                       goto err_clk_register;
>> +
>> +               asiu_clk = &asiu->clks[i];
>> +               asiu_clk->name = clk_name;
>> +               asiu_clk->asiu = asiu;
>> +               asiu_clk->div = div[i];
>> +               asiu_clk->gate = gate[i];
>> +               init.name = clk_name;
>> +               init.ops = &iproc_asiu_ops;
>> +               init.flags = 0;
>> +               parent_name = of_clk_get_parent_name(node, 0);
>> +               init.parent_names = (parent_name ? &parent_name : NULL);
>> +               init.num_parents = (parent_name ? 1 : 0);
>> +               asiu_clk->hw.init = &init;
>> +
>> +               clk = clk_register(NULL, &asiu_clk->hw);
>> +               if (WARN_ON(IS_ERR(clk)))
>> +                       goto err_clk_register;
>> +               asiu->clk_data.clks[i] = clk;
>> +       }
>> +
>> +       ret = of_clk_add_provider(node, of_clk_src_onecell_get,
>> +                       &asiu->clk_data);
>> +       if (WARN_ON(ret))
>> +               goto err_clk_register;
>> +
>> +       return;
>> +
>> +err_clk_register:
>> +       for (i = 0; i < num_clks; i++)
>> +               kfree(asiu->clks[i].name);
>> +       iounmap(asiu->gate_base);
>> +
>> +err_iomap_gate:
>> +       iounmap(asiu->div_base);
>> +
>> +err_iomap_div:
>> +       kfree(asiu->clks);
>> +
>> +err_asiu_clks:
>> +       kfree(asiu->clk_data.clks);
>> +
>> +err_clks:
>> +       kfree(asiu);
>> +}
>> diff --git a/drivers/clk/bcm/clk-iproc-clk.c b/drivers/clk/bcm/clk-iproc-clk.c
>> new file mode 100644
>> index 0000000..be3c42c
>> --- /dev/null
>> +++ b/drivers/clk/bcm/clk-iproc-clk.c
>> @@ -0,0 +1,238 @@
>> +/*
>> + * Copyright (C) 2014 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/err.h>
>> +#include <linux/clk-provider.h>
>> +#include <linux/io.h>
>> +#include <linux/of.h>
>> +#include <linux/clkdev.h>
>> +#include <linux/of_address.h>
>> +#include <linux/delay.h>
>> +
>> +#include "clk-iproc.h"
>> +
>> +struct iproc_pll;
>> +
>> +struct iproc_clk {
>> +       struct clk_hw hw;
>> +       const char *name;
>> +       struct iproc_pll *pll;
>> +       unsigned long rate;
>> +       const struct iproc_clk_ctrl *ctrl;
>> +};
>> +
>> +struct iproc_pll {
>> +       void __iomem *base;
>> +       struct clk_onecell_data clk_data;
>> +       struct iproc_clk *clks;
>> +};
>> +
>> +#define to_iproc_clk(hw) container_of(hw, struct iproc_clk, hw)
>> +
>> +static int iproc_clk_enable(struct clk_hw *hw)
>> +{
>> +       struct iproc_clk *clk = to_iproc_clk(hw);
>> +       const struct iproc_clk_ctrl *ctrl = clk->ctrl;
>> +       struct iproc_pll *pll = clk->pll;
>> +       u32 val;
>> +
>> +       /* channel enable is active low */
>> +       val = readl(pll->base + ctrl->enable.offset);
>> +       val &= ~(1 << ctrl->enable.enable_shift);
>> +       writel(val, pll->base + ctrl->enable.offset);
>> +
>> +       /* also make sure channel is not held */
>> +       val = readl(pll->base + ctrl->enable.offset);
>> +       val &= ~(1 << ctrl->enable.hold_shift);
>> +       writel(val, pll->base + ctrl->enable.offset);
>> +
>> +       return 0;
>> +}
>> +
>> +static void iproc_clk_disable(struct clk_hw *hw)
>> +{
>> +       struct iproc_clk *clk = to_iproc_clk(hw);
>> +       const struct iproc_clk_ctrl *ctrl = clk->ctrl;
>> +       struct iproc_pll *pll = clk->pll;
>> +       u32 val;
>> +
>> +       if (ctrl->flags & IPROC_CLK_AON)
>> +               return;
>> +
>> +       val = readl(pll->base + ctrl->enable.offset);
>> +       val |= 1 << ctrl->enable.enable_shift;
>> +       writel(val, pll->base + ctrl->enable.offset);
>> +}
>> +
>> +static unsigned long iproc_clk_recalc_rate(struct clk_hw *hw,
>> +               unsigned long parent_rate)
>> +{
>> +       struct iproc_clk *clk = to_iproc_clk(hw);
>> +       const struct iproc_clk_ctrl *ctrl = clk->ctrl;
>> +       struct iproc_pll *pll = clk->pll;
>> +       u32 val;
>> +       unsigned int mdiv;
>> +
>> +       if (parent_rate == 0)
>> +               return 0;
>> +
>> +       val = readl(pll->base + ctrl->mdiv.offset);
>> +       mdiv = (val >> ctrl->mdiv.shift) & bit_mask(ctrl->mdiv.width);
>> +       if (mdiv == 0)
>> +               mdiv = 256;
>> +
>> +       clk->rate = parent_rate / mdiv;
>> +
>> +       return clk->rate;
>> +}
>> +
>> +static long iproc_clk_round_rate(struct clk_hw *hw, unsigned long rate,
>> +               unsigned long *parent_rate)
>> +{
>> +       unsigned int div;
>> +
>> +       if (rate == 0 || *parent_rate == 0)
>> +               return -EINVAL;
>> +
>> +       if (rate == *parent_rate)
>> +               return *parent_rate;
>> +
>> +       div = DIV_ROUND_UP(*parent_rate, rate);
>> +       if (div < 2)
>> +               return *parent_rate;
>> +
>> +       if (div > 256)
>> +               div = 256;
>> +
>> +       return *parent_rate / div;
>> +}
>> +
>> +static int iproc_clk_set_rate(struct clk_hw *hw, unsigned long rate,
>> +               unsigned long parent_rate)
>> +{
>> +       struct iproc_clk *clk = to_iproc_clk(hw);
>> +       const struct iproc_clk_ctrl *ctrl = clk->ctrl;
>> +       struct iproc_pll *pll = clk->pll;
>> +       u32 val;
>> +       unsigned int div;
>> +
>> +       if (rate == 0 || parent_rate == 0)
>> +               return -EINVAL;
>> +
>> +       div = DIV_ROUND_UP(parent_rate, rate);
>> +       if (div > 256)
>> +               return -EINVAL;
>> +
>> +       val = readl(pll->base + ctrl->mdiv.offset);
>> +       if (div == 256) {
>> +               val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
>> +       } else {
>> +               val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
>> +               val |= div << ctrl->mdiv.shift;
>> +       }
>> +       writel(val, pll->base + ctrl->mdiv.offset);
>> +       clk->rate = parent_rate / div;
>> +
>> +       return 0;
>> +}
>> +
>> +static const struct clk_ops iproc_clk_ops = {
>> +       .enable = iproc_clk_enable,
>> +       .disable = iproc_clk_disable,
>> +       .recalc_rate = iproc_clk_recalc_rate,
>> +       .round_rate = iproc_clk_round_rate,
>> +       .set_rate = iproc_clk_set_rate,
>> +};
>> +
>> +void __init iproc_clk_setup(struct device_node *node,
>> +               const struct iproc_clk_ctrl *ctrl, unsigned int num_clks)
>> +{
>> +       int i, ret;
>> +       struct iproc_pll *pll;
>> +
>> +       if (WARN_ON(!ctrl))
>> +               return;
>> +
>> +       pll = kzalloc(sizeof(*pll), GFP_KERNEL);
>> +       if (WARN_ON(!pll))
>> +               return;
>> +
>> +       pll->clk_data.clk_num = num_clks;
>> +       pll->clk_data.clks = kcalloc(num_clks, sizeof(*pll->clk_data.clks),
>> +                       GFP_KERNEL);
>> +       if (WARN_ON(!pll->clk_data.clks))
>> +               goto err_clks;
>> +
>> +       pll->clks = kcalloc(num_clks, sizeof(*pll->clks), GFP_KERNEL);
>> +       if (WARN_ON(!pll->clks))
>> +               goto err_pll_clks;
>> +
>> +       pll->base = of_iomap(node, 0);
>> +       if (WARN_ON(!pll->base))
>> +               goto err_iomap;
>> +
>> +       for (i = 0; i < num_clks; i++) {
>> +               struct clk_init_data init;
>> +               struct clk *clk;
>> +               const char *parent_name;
>> +               struct iproc_clk *iclk;
>> +               const char *clk_name;
>> +
>> +               clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
>> +               if (WARN_ON(!clk_name))
>> +                       goto err_clk_register;
>> +
>> +               ret = of_property_read_string_index(node, "clock-output-names",
>> +                               i, &clk_name);
>> +               if (WARN_ON(ret))
>> +                       goto err_clk_register;
>> +
>> +               iclk = &pll->clks[i];
>> +               iclk->name = clk_name;
>> +               iclk->pll = pll;
>> +               iclk->ctrl = &ctrl[i];
>> +               init.name = clk_name;
>> +               init.ops = &iproc_clk_ops;
>> +               init.flags = 0;
>> +               parent_name = of_clk_get_parent_name(node, 0);
>> +               init.parent_names = (parent_name ? &parent_name : NULL);
>> +               init.num_parents = (parent_name ? 1 : 0);
>> +               iclk->hw.init = &init;
>> +
>> +               clk = clk_register(NULL, &iclk->hw);
>> +               if (WARN_ON(IS_ERR(clk)))
>> +                       goto err_clk_register;
>> +               pll->clk_data.clks[i] = clk;
>> +       }
>> +
>> +       ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
>> +       if (WARN_ON(ret))
>> +               goto err_clk_register;
>> +
>> +       return;
>> +
>> +err_clk_register:
>> +       for (i = 0; i < num_clks; i++)
>> +               kfree(pll->clks[i].name);
>> +       iounmap(pll->base);
>> +
>> +err_iomap:
>> +       kfree(pll->clks);
>> +
>> +err_pll_clks:
>> +       kfree(pll->clk_data.clks);
>> +
>> +err_clks:
>> +       kfree(pll);
>> +}
>> diff --git a/drivers/clk/bcm/clk-iproc-pll.c b/drivers/clk/bcm/clk-iproc-pll.c
>> new file mode 100644
>> index 0000000..cd3bd38
>> --- /dev/null
>> +++ b/drivers/clk/bcm/clk-iproc-pll.c
>> @@ -0,0 +1,483 @@
>> +/*
>> + * Copyright (C) 2014 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/err.h>
>> +#include <linux/clk-provider.h>
>> +#include <linux/io.h>
>> +#include <linux/of.h>
>> +#include <linux/clkdev.h>
>> +#include <linux/of_address.h>
>> +#include <linux/delay.h>
>> +
>> +#include "clk-iproc.h"
>> +
>> +#define PLL_VCO_HIGH_SHIFT 19
>> +#define PLL_VCO_LOW_SHIFT  30
>> +
>> +/* number of delay loops waiting for PLL to lock */
>> +#define LOCK_DELAY 100
>> +
>> +/* number of VCO frequency bands */
>> +#define NUM_FREQ_BANDS 8
>> +
>> +#define NUM_KP_BANDS 3
>> +enum kp_band {
>> +       KP_BAND_MID = 0,
>> +       KP_BAND_HIGH,
>> +       KP_BAND_HIGH_HIGH
>> +};
>> +
>> +static const unsigned int kp_table[NUM_KP_BANDS][NUM_FREQ_BANDS] = {
>> +       { 5, 6, 6, 7, 7, 8, 9, 10 },
>> +       { 4, 4, 5, 5, 6, 7, 8, 9  },
>> +       { 4, 5, 5, 6, 7, 8, 9, 10 },
>> +};
>> +
>> +static const unsigned long ref_freq_table[NUM_FREQ_BANDS][2] = {
>> +       { 10000000,  12500000  },
>> +       { 12500000,  15000000  },
>> +       { 15000000,  20000000  },
>> +       { 20000000,  25000000  },
>> +       { 25000000,  50000000  },
>> +       { 50000000,  75000000  },
>> +       { 75000000,  100000000 },
>> +       { 100000000, 125000000 },
>> +};
>> +
>> +enum vco_freq_range {
>> +       VCO_LOW       = 700000000U,
>> +       VCO_MID       = 1200000000U,
>> +       VCO_HIGH      = 2200000000U,
>> +       VCO_HIGH_HIGH = 3100000000U,
>> +       VCO_MAX       = 4000000000U,
>> +};
>> +
>> +struct iproc_pll {
>> +       struct clk_hw hw;
>> +       void __iomem *pll_base;
>> +       void __iomem *pwr_base;
>> +       void __iomem *asiu_base;
>> +       struct clk_onecell_data clk_data;
>> +       const char *name;
>> +       const struct iproc_pll_ctrl *ctrl;
>> +       const struct iproc_pll_vco_freq_param *vco_param;
>> +       unsigned int num_vco_entries;
>> +       unsigned long rate;
>> +};
>> +
>> +#define to_iproc_pll(hw) container_of(hw, struct iproc_pll, hw)
>> +
>> +/*
>> + * Get the clock rate based on name
>> + */
>> +static unsigned long __get_rate(const char *clk_name)
>> +{
>> +       struct clk *clk;
>> +
>> +       clk = __clk_lookup(clk_name);
>> +       if (!clk) {
>> +               pr_err("%s: unable to find clock by name: %s\n", __func__,
>> +                               clk_name);
>> +               return 0;
>> +       }
>> +
>> +       return clk_get_rate(clk);
>> +}
>> +
>> +/*
>> + * Based on the target frequency, find a match from the VCO frequency parameter
>> + * table and return its index
>> + */
>> +static int pll_get_rate_index(struct iproc_pll *pll, unsigned int target_rate)
>> +{
>> +       int i;
>> +
>> +       for (i = 0; i < pll->num_vco_entries; i++)
>> +               if (target_rate == pll->vco_param[i].rate)
>> +                       break;
>> +
>> +       if (i >= pll->num_vco_entries)
>> +               return -EINVAL;
>> +
>> +       return i;
>> +}
>> +
>> +static int get_kp(unsigned long ref_freq, enum kp_band kp_index)
>> +{
>> +       int i;
>> +
>> +       if (ref_freq < ref_freq_table[0][0])
>> +               return -EINVAL;
>> +
>> +       for (i = 0; i < NUM_FREQ_BANDS; i++) {
>> +               if (ref_freq >= ref_freq_table[i][0] &&
>> +                       ref_freq < ref_freq_table[i][1])
>> +                       return kp_table[kp_index][i];
>> +       }
>> +       return -EINVAL;
>> +}
>> +
>> +static int pll_wait_for_lock(struct iproc_pll *pll)
>> +{
>> +       int i;
>> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
>> +
>> +       for (i = 0; i < LOCK_DELAY; i++) {
>> +               u32 val = readl(pll->pll_base + ctrl->status.offset);
>> +
>> +               if (val & (1 << ctrl->status.shift))
>> +                       return 0;
>> +               udelay(10);
>> +       }
>> +
>> +       return -EIO;
>> +}
>> +
>> +static void __pll_disable(struct iproc_pll *pll)
>> +{
>> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
>> +       u32 val;
>> +
>> +       if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
>> +               val = readl(pll->asiu_base + ctrl->asiu.offset);
>> +               val &= ~(1 << ctrl->asiu.en_shift);
>> +               writel(val, pll->asiu_base + ctrl->asiu.offset);
>> +       }
>> +
>> +       /* latch input value so core power can be shut down */
>> +       val = readl(pll->pwr_base + ctrl->aon.offset);
>> +       val |= (1 << ctrl->aon.iso_shift);
>> +       writel(val, pll->pwr_base + ctrl->aon.offset);
>> +
>> +       /* power down the core */
>> +       val &= ~(bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift);
>> +       writel(val, pll->pwr_base + ctrl->aon.offset);
>> +}
>> +
>> +static int __pll_enable(struct iproc_pll *pll)
>> +{
>> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
>> +       u32 val;
>> +
>> +       /* power up the PLL and make sure it's not latched */
>> +       val = readl(pll->pwr_base + ctrl->aon.offset);
>> +       val |= bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift;
>> +       val &= ~(1 << ctrl->aon.iso_shift);
>> +       writel(val, pll->pwr_base + ctrl->aon.offset);
>> +
>> +       /* certain PLLs also need to be ungated from the ASIU top level */
>> +       if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
>> +               val = readl(pll->asiu_base + ctrl->asiu.offset);
>> +               val |= (1 << ctrl->asiu.en_shift);
>> +               writel(val, pll->asiu_base + ctrl->asiu.offset);
>> +       }
>> +
>> +       return 0;
>> +}
>> +
>> +static void __pll_put_in_reset(struct iproc_pll *pll)
>> +{
>> +       u32 val;
>> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
>> +       const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
>> +
>> +       val = readl(pll->pll_base + reset->offset);
>> +       val &= ~(1 << reset->reset_shift | 1 << reset->p_reset_shift);
>> +       writel(val, pll->pll_base + reset->offset);
>> +}
>> +
>> +static void __pll_bring_out_reset(struct iproc_pll *pll, unsigned int kp,
>> +               unsigned int ka, unsigned int ki)
>> +{
>> +       u32 val;
>> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
>> +       const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
>> +
>> +       val = readl(pll->pll_base + reset->offset);
>> +       val &= ~(bit_mask(reset->ki_width) << reset->ki_shift |
>> +               bit_mask(reset->kp_width) << reset->kp_shift |
>> +               bit_mask(reset->ka_width) << reset->ka_shift);
>> +       val |=  ki << reset->ki_shift | kp << reset->kp_shift |
>> +               ka << reset->ka_shift;
>> +       val |= 1 << reset->reset_shift | 1 << reset->p_reset_shift;
>> +       writel(val, pll->pll_base + reset->offset);
>> +}
>> +
>> +static int pll_set_rate(struct iproc_pll *pll, unsigned int rate_index,
>> +               unsigned long parent_rate)
>> +{
>> +       const struct iproc_pll_vco_freq_param *vco =
>> +                               &pll->vco_param[rate_index];
>> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
>> +       int ka = 0, ki, kp, ret;
>> +       unsigned long rate = vco->rate;
>> +       u32 val;
>> +       enum kp_band kp_index;
>> +       unsigned long ref_freq;
>> +
>> +       /*
>> +        * reference frequency = parent frequency / PDIV
>> +        * If PDIV = 0, then it becomes a multiplier (x2)
>> +        */
>> +       if (vco->pdiv == 0)
>> +               ref_freq = parent_rate * 2;
>> +       else
>> +               ref_freq = parent_rate / vco->pdiv;
>> +
>> +       /* determine Ki and Kp index based on target VCO frequency */
>> +       if (rate >= VCO_LOW && rate < VCO_HIGH) {
>> +               ki = 4;
>> +               kp_index = KP_BAND_MID;
>> +       } else if (rate >= VCO_HIGH && rate && rate < VCO_HIGH_HIGH) {
>> +               ki = 3;
>> +               kp_index = KP_BAND_HIGH;
>> +       } else if (rate >= VCO_HIGH_HIGH && rate < VCO_MAX) {
>> +               ki = 3;
>> +               kp_index = KP_BAND_HIGH_HIGH;
>> +       } else {
>> +               pr_err("%s: pll: %s has invalid rate: %lu\n", __func__,
>> +                               pll->name, rate);
>> +               return -EINVAL;
>> +       }
>> +
>> +       kp = get_kp(ref_freq, kp_index);
>> +       if (kp < 0) {
>> +               pr_err("%s: pll: %s has invalid kp\n", __func__, pll->name);
>> +               return kp;
>> +       }
>> +
>> +       ret = __pll_enable(pll);
>> +       if (ret) {
>> +               pr_err("%s: pll: %s fails to enable\n", __func__, pll->name);
>> +               return ret;
>> +       }
>> +
>> +       /* put PLL in reset */
>> +       __pll_put_in_reset(pll);
>> +
>> +       writel(0, pll->pll_base + ctrl->vco_ctrl.u_offset);
>> +       val = readl(pll->pll_base + ctrl->vco_ctrl.l_offset);
>> +
>> +       if (rate >= VCO_LOW && rate < VCO_MID)
>> +               val |= (1 << PLL_VCO_LOW_SHIFT);
>> +
>> +       if (rate < VCO_HIGH)
>> +               val &= ~(1 << PLL_VCO_HIGH_SHIFT);
>> +       else
>> +               val |= (1 << PLL_VCO_HIGH_SHIFT);
>> +
>> +       writel(val, pll->pll_base + ctrl->vco_ctrl.l_offset);
>> +
>> +       /* program integer part of NDIV */
>> +       val = readl(pll->pll_base + ctrl->ndiv_int.offset);
>> +       val &= ~(bit_mask(ctrl->ndiv_int.width) << ctrl->ndiv_int.shift);
>> +       val |= vco->ndiv_int << ctrl->ndiv_int.shift;
>> +       writel(val, pll->pll_base + ctrl->ndiv_int.offset);
>> +
>> +       /* program fractional part of NDIV */
>> +       if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
>> +               val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
>> +               val &= ~(bit_mask(ctrl->ndiv_frac.width) <<
>> +                               ctrl->ndiv_frac.shift);
>> +               val |= vco->ndiv_frac << ctrl->ndiv_frac.shift;
>> +               writel(val, pll->pll_base + ctrl->ndiv_frac.offset);
>> +       }
>> +
>> +       /* program PDIV */
>> +       val = readl(pll->pll_base + ctrl->pdiv.offset);
>> +       val &= ~(bit_mask(ctrl->pdiv.width) << ctrl->pdiv.shift);
>> +       val |= vco->pdiv << ctrl->pdiv.shift;
>> +       writel(val, pll->pll_base + ctrl->pdiv.offset);
>> +
>> +       __pll_bring_out_reset(pll, kp, ka, ki);
>> +
>> +       ret = pll_wait_for_lock(pll);
>> +       if (ret < 0) {
>> +               pr_err("%s: pll: %s failed to lock\n", __func__, pll->name);
>> +               return ret;
>> +       }
>> +
>> +       return 0;
>> +}
>> +
>> +static int iproc_pll_enable(struct clk_hw *hw)
>> +{
>> +       struct iproc_pll *pll = to_iproc_pll(hw);
>> +
>> +       return __pll_enable(pll);
>> +}
>> +
>> +static void iproc_pll_disable(struct clk_hw *hw)
>> +{
>> +       struct iproc_pll *pll = to_iproc_pll(hw);
>> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
>> +
>> +       if (ctrl->flags & IPROC_CLK_AON)
>> +               return;
>> +
>> +       __pll_disable(pll);
>> +}
>> +
>> +static unsigned long iproc_pll_recalc_rate(struct clk_hw *hw,
>> +       unsigned long parent_rate)
>> +{
>> +       struct iproc_pll *pll = to_iproc_pll(hw);
>> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
>> +       u32 val;
>> +       u64 ndiv;
>> +       unsigned int ndiv_int, ndiv_frac, pdiv;
>> +
>> +       if (parent_rate == 0)
>> +               return 0;
>> +
>> +       /* PLL needs to be locked */
>> +       val = readl(pll->pll_base + ctrl->status.offset);
>> +       if ((val & (1 << ctrl->status.shift)) == 0) {
>> +               pll->rate = 0;
>> +               return 0;
>> +       }
>> +
>> +       /*
>> +        * PLL output frequency =
>> +        *
>> +        * ((ndiv_int + ndiv_frac / 2^20) * (parent clock rate / pdiv)
>> +        */
>> +       val = readl(pll->pll_base + ctrl->ndiv_int.offset);
>> +       ndiv_int = (val >> ctrl->ndiv_int.shift) &
>> +               bit_mask(ctrl->ndiv_int.width);
>> +       ndiv = ndiv_int << ctrl->ndiv_int.shift;
>> +
>> +       if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
>> +               val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
>> +               ndiv_frac = (val >> ctrl->ndiv_frac.shift) &
>> +                       bit_mask(ctrl->ndiv_frac.width);
>> +
>> +               if (ndiv_frac != 0)
>> +                       ndiv = (ndiv_int << ctrl->ndiv_int.shift) | ndiv_frac;
>> +       }
>> +
>> +       val = readl(pll->pll_base + ctrl->pdiv.offset);
>> +       pdiv = (val >> ctrl->pdiv.shift) & bit_mask(ctrl->pdiv.width);
>> +
>> +       pll->rate = (ndiv * parent_rate) >> ctrl->ndiv_int.shift;
>> +
>> +       if (pdiv == 0)
>> +               pll->rate *= 2;
>> +       else
>> +               pll->rate /= pdiv;
>> +
>> +       return pll->rate;
>> +}
>> +
>> +static const struct clk_ops iproc_pll_ops = {
>> +       .enable = iproc_pll_enable,
>> +       .disable = iproc_pll_disable,
>> +       .recalc_rate = iproc_pll_recalc_rate,
>> +};
>> +
>> +void __init iproc_pll_setup(struct device_node *node,
>> +               const struct iproc_pll_ctrl *ctrl,
>> +               const struct iproc_pll_vco_freq_param *vco_param,
>> +               unsigned int num_vco_entries)
>> +{
>> +       int ret;
>> +       struct clk *clk;
>> +       struct iproc_pll *pll;
>> +       struct clk_init_data init;
>> +       const char *parent_name;
>> +       unsigned int rate;
>> +
>> +       if (WARN_ON(!ctrl))
>> +               return;
>> +
>> +       pll = kzalloc(sizeof(*pll), GFP_KERNEL);
>> +       if (WARN_ON(!pll))
>> +               return;
>> +
>> +       pll->pll_base = of_iomap(node, 0);
>> +       if (WARN_ON(!pll->pll_base))
>> +               goto err_pll_iomap;
>> +
>> +       pll->pwr_base = of_iomap(node, 1);
>> +       if (WARN_ON(!pll->pwr_base))
>> +               goto err_pwr_iomap;
>> +
>> +       /* some PLLs require gating control at the top ASIU level */
>> +       if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
>> +               pll->asiu_base = of_iomap(node, 2);
>> +               if (WARN_ON(!pll->asiu_base))
>> +                       goto err_asiu_iomap;
>> +       }
>> +
>> +       pll->ctrl = ctrl;
>> +       pll->name = node->name;
>> +       init.name = node->name;
>> +       init.ops = &iproc_pll_ops;
>> +       init.flags = 0;
>> +       parent_name = of_clk_get_parent_name(node, 0);
>> +       init.parent_names = (parent_name ? &parent_name : NULL);
>> +       init.num_parents = (parent_name ? 1 : 0);
>> +       pll->hw.init = &init;
>> +
>> +       /* configure the PLL to the desired VCO frequency if specified */
>> +       ret = of_property_read_u32(node, "clock-frequency", &rate);
>> +       if (!ret) {
>> +               unsigned long parent_rate;
>> +               int rate_index;
>> +
>> +               if (WARN_ON(!vco_param))
>> +                       goto err_clk_register;
>> +
>> +               pll->num_vco_entries = num_vco_entries;
>> +               pll->vco_param = vco_param;
>> +
>> +               parent_rate = __get_rate(parent_name);
>> +               if (WARN_ON(!parent_rate))
>> +                       goto err_clk_register;
>> +
>> +               rate_index = pll_get_rate_index(pll, rate);
>> +               if (WARN_ON(rate_index < 0))
>> +                       goto err_clk_register;
>> +
>> +               ret = pll_set_rate(pll, rate_index, parent_rate);
>> +               if (WARN_ON(ret))
>> +                       goto err_clk_register;
>> +       }
>> +
>> +       clk = clk_register(NULL, &pll->hw);
>> +       if (WARN_ON(IS_ERR(clk)))
>> +               goto err_clk_register;
>> +
>> +       pll->clk_data.clk_num = 1;
>> +       pll->clk_data.clks = &clk;
>> +
>> +       ret = of_clk_add_provider(node, of_clk_src_onecell_get,
>> +                       &pll->clk_data);
>> +       if (WARN_ON(ret))
>> +               goto err_clk_add;
>> +
>> +       return;
>> +
>> +err_clk_add:
>> +       clk_unregister(clk);
>> +err_clk_register:
>> +       if (pll->asiu_base)
>> +               iounmap(pll->asiu_base);
>> +err_asiu_iomap:
>> +       iounmap(pll->pwr_base);
>> +err_pwr_iomap:
>> +       iounmap(pll->pll_base);
>> +err_pll_iomap:
>> +       kfree(pll);
>> +}
>> diff --git a/drivers/clk/bcm/clk-iproc.h b/drivers/clk/bcm/clk-iproc.h
>> new file mode 100644
>> index 0000000..4aa0479
>> --- /dev/null
>> +++ b/drivers/clk/bcm/clk-iproc.h
>> @@ -0,0 +1,155 @@
>> +/*
>> + * Copyright (C) 2014 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#ifndef _CLK_IPROC_H
>> +#define _CLK_IPROC_H
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/list.h>
>> +#include <linux/spinlock.h>
>> +#include <linux/slab.h>
>> +#include <linux/device.h>
>> +#include <linux/of.h>
>> +#include <linux/clk-provider.h>
>> +
>> +#define IPROC_CLK_NAME_LEN 25
>> +#define IPROC_CLK_INVALID_OFFSET 0xffffffff
>> +#define bit_mask(width) ((1 << (width)) - 1)
>> +
>> +/* clock should not be disabled at runtime */
>> +#define IPROC_CLK_AON BIT(0)
>> +
>> +/* PLL requires gating through ASIU */
>> +#define IPROC_CLK_PLL_ASIU BIT(1)
>> +
>> +/* PLL has fractional part of the NDIV */
>> +#define IPROC_CLK_PLL_HAS_NDIV_FRAC BIT(2)
>> +
>> +/*
>> + * Parameters for VCO frequency configuration
>> + *
>> + * VCO frequency =
>> + * ((ndiv_int + ndiv_frac / 2^20) * (ref freqeuncy  / pdiv)
>> + */
>> +struct iproc_pll_vco_freq_param {
>> +       unsigned long rate;
>> +       unsigned int ndiv_int;
>> +       unsigned int ndiv_frac;
>> +       unsigned int pdiv;
>> +};
>> +
>> +struct iproc_clk_reg_op {
>> +       unsigned int offset;
>> +       unsigned int shift;
>> +       unsigned int width;
>> +};
>> +
>> +/*
>> + * Clock gating control at the top ASIU level
>> + */
>> +struct iproc_asiu_gate {
>> +       unsigned int offset;
>> +       unsigned int en_shift;
>> +};
>> +
>> +/*
>> + * Control of powering on/off of a PLL
>> + *
>> + * Before powering off a PLL, input isolation (ISO) needs to be enabled
>> + */
>> +struct iproc_pll_aon_pwr_ctrl {
>> +       unsigned int offset;
>> +       unsigned int pwr_width;
>> +       unsigned int pwr_shift;
>> +       unsigned int iso_shift;
>> +};
>> +
>> +/*
>> + * Control of the PLL reset, with Ki, Kp, and Ka parameters
>> + */
>> +struct iproc_pll_reset_ctrl {
>> +       unsigned int offset;
>> +       unsigned int reset_shift;
>> +       unsigned int p_reset_shift;
>> +       unsigned int ki_shift;
>> +       unsigned int ki_width;
>> +       unsigned int kp_shift;
>> +       unsigned int kp_width;
>> +       unsigned int ka_shift;
>> +       unsigned int ka_width;
>> +};
>> +
>> +struct iproc_pll_vco_ctrl {
>> +       unsigned int u_offset;
>> +       unsigned int l_offset;
>> +};
>> +
>> +/*
>> + * Main PLL control parameters
>> + */
>> +struct iproc_pll_ctrl {
>> +       unsigned long flags;
>> +       struct iproc_pll_aon_pwr_ctrl aon;
>> +       struct iproc_asiu_gate asiu;
>> +       struct iproc_pll_reset_ctrl reset;
>> +       struct iproc_clk_reg_op ndiv_int;
>> +       struct iproc_clk_reg_op ndiv_frac;
>> +       struct iproc_clk_reg_op pdiv;
>> +       struct iproc_pll_vco_ctrl vco_ctrl;
>> +       struct iproc_clk_reg_op status;
>> +};
>> +
>> +/*
>> + * Controls enabling/disabling a PLL derived clock
>> + */
>> +struct iproc_clk_enable_ctrl {
>> +       unsigned int offset;
>> +       unsigned int enable_shift;
>> +       unsigned int hold_shift;
>> +       unsigned int bypass_shift;
>> +};
>> +
>> +/*
>> + * Main clock control parameters for clocks derived from the PLLs
>> + */
>> +struct iproc_clk_ctrl {
>> +       unsigned int channel;
>> +       unsigned long flags;
>> +       struct iproc_clk_enable_ctrl enable;
>> +       struct iproc_clk_reg_op mdiv;
>> +};
>> +
>> +/*
>> + * Divisor of the ASIU clocks
>> + */
>> +struct iproc_asiu_div {
>> +       unsigned int offset;
>> +       unsigned int en_shift;
>> +       unsigned int high_shift;
>> +       unsigned int high_width;
>> +       unsigned int low_shift;
>> +       unsigned int low_width;
>> +};
>> +
>> +extern void __init iproc_armpll_setup(struct device_node *node);
>> +extern void __init iproc_pll_setup(struct device_node *node,
>> +               const struct iproc_pll_ctrl *ctrl,
>> +               const struct iproc_pll_vco_freq_param *vco_param,
>> +               unsigned int num_freqs);
>> +extern void __init iproc_clk_setup(struct device_node *node,
>> +               const struct iproc_clk_ctrl *ctrl, unsigned int num_clks);
>> +extern void __init iproc_asiu_setup(struct device_node *node,
>> +               const struct iproc_asiu_div *div,
>> +               const struct iproc_asiu_gate *gate, unsigned int num_clks);
>> +
>> +#endif /* _CLK_IPROC_H */
>> --
>> 1.7.9.5
>>
>>
>> _______________________________________________
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>> linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
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[PATCH 2/4] clk: iproc: add initial common clock support

[Ray Jui]

On 12/6/2014 2:20 PM, Tim Kryger wrote:
> On Thu, Dec 4, 2014 at 1:43 PM, Ray Jui <rjui@broadcom.com> wrote:
>> This adds basic and generic support for various iProc PLLs and clocks
>> including the ARMPLL, GENPLL, LCPLL, MIPIPLL, and ASIU clocks.
>>
>> SoCs under the iProc architecture can define their specific register
>> offsets and clock parameters for their PLL and clock controllers. These
>> parameters can be passed as arugments into the generic iProc PLL and
>> clock setup functions
>>
>> Derived from code originally provided by Jonathan Richardson
>> <jonathar@broadcom.com>
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>> ---
>>   drivers/clk/Makefile               |    2 +-
>>   drivers/clk/bcm/Kconfig            |    9 +
>>   drivers/clk/bcm/Makefile           |    1 +
>>   drivers/clk/bcm/clk-iproc-armpll.c |  286 +++++++++++++++++++++
>>   drivers/clk/bcm/clk-iproc-asiu.c   |  275 ++++++++++++++++++++
>>   drivers/clk/bcm/clk-iproc-clk.c    |  238 ++++++++++++++++++
>>   drivers/clk/bcm/clk-iproc-pll.c    |  483 ++++++++++++++++++++++++++++++++++++
>>   drivers/clk/bcm/clk-iproc.h        |  155 ++++++++++++
>>   8 files changed, 1448 insertions(+), 1 deletion(-)
>>   create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
>>   create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
>>   create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
>>   create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
>>   create mode 100644 drivers/clk/bcm/clk-iproc.h
>>
>> diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
>> index d5fba5b..eff0213 100644
>> --- a/drivers/clk/Makefile
>> +++ b/drivers/clk/Makefile
>> @@ -41,7 +41,7 @@ obj-$(CONFIG_ARCH_VT8500)             += clk-vt8500.o
>>   obj-$(CONFIG_COMMON_CLK_WM831X)                += clk-wm831x.o
>>   obj-$(CONFIG_COMMON_CLK_XGENE)         += clk-xgene.o
>>   obj-$(CONFIG_COMMON_CLK_AT91)          += at91/
>> -obj-$(CONFIG_ARCH_BCM_MOBILE)          += bcm/
>> +obj-$(CONFIG_ARCH_BCM)                 += bcm/
>>   obj-$(CONFIG_ARCH_BERLIN)              += berlin/
>>   obj-$(CONFIG_ARCH_HI3xxx)              += hisilicon/
>>   obj-$(CONFIG_ARCH_HIP04)               += hisilicon/
>
> It may be best to move the above change into its own commit.
>
Okay. Will make this change along with other changes if required. Still 
waiting for more code review comments at this point.

>> diff --git a/drivers/clk/bcm/Kconfig b/drivers/clk/bcm/Kconfig
>> index 75506e5..66b5b7f 100644
>> --- a/drivers/clk/bcm/Kconfig
>> +++ b/drivers/clk/bcm/Kconfig
>> @@ -7,3 +7,12 @@ config CLK_BCM_KONA
>>            Enable common clock framework support for Broadcom SoCs
>>            using "Kona" style clock control units, including those
>>            in the BCM281xx and BCM21664 families.
>> +
>> +config COMMON_CLK_IPROC
>> +       bool "Broadcom iProc clock support"
>> +       depends on ARCH_BCM_IPROC
>> +       depends on COMMON_CLK
>> +       default y
>> +       help
>> +         Enable common clock framework support for Broadcom SoCs
>> +         based on the "iProc" architecture
>> diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
>> index 6297d05..6926636 100644
>> --- a/drivers/clk/bcm/Makefile
>> +++ b/drivers/clk/bcm/Makefile
>> @@ -2,3 +2,4 @@ obj-$(CONFIG_CLK_BCM_KONA)      += clk-kona.o
>>   obj-$(CONFIG_CLK_BCM_KONA)     += clk-kona-setup.o
>>   obj-$(CONFIG_CLK_BCM_KONA)     += clk-bcm281xx.o
>>   obj-$(CONFIG_CLK_BCM_KONA)     += clk-bcm21664.o
>> +obj-$(CONFIG_COMMON_CLK_IPROC) += clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
>> diff --git a/drivers/clk/bcm/clk-iproc-armpll.c b/drivers/clk/bcm/clk-iproc-armpll.c
>> new file mode 100644
>> index 0000000..ec9b130
>> --- /dev/null
>> +++ b/drivers/clk/bcm/clk-iproc-armpll.c
>> @@ -0,0 +1,286 @@
>> +/*
>> + * Copyright (C) 2014 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/slab.h>
>> +#include <linux/err.h>
>> +#include <linux/clk-provider.h>
>> +#include <linux/io.h>
>> +#include <linux/of.h>
>> +#include <linux/clkdev.h>
>> +#include <linux/of_address.h>
>> +
>> +#define IPROC_CLK_MAX_FREQ_POLICY                    0x3
>> +#define IPROC_CLK_POLICY_FREQ_OFFSET                 0x008
>> +#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT      8
>> +#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK       0x7
>> +
>> +#define IPROC_CLK_PLLARMA_OFFSET                     0xc00
>> +#define IPROC_CLK_PLLARMA_LOCK_SHIFT                 28
>> +#define IPROC_CLK_PLLARMA_PDIV_SHIFT                 24
>> +#define IPROC_CLK_PLLARMA_PDIV_MASK                  0xf
>> +#define IPROC_CLK_PLLARMA_NDIV_INT_SHIFT             8
>> +#define IPROC_CLK_PLLARMA_NDIV_INT_MASK              0x3ff
>> +
>> +#define IPROC_CLK_PLLARMB_OFFSET                     0xc04
>> +#define IPROC_CLK_PLLARMB_NDIV_FRAC_MASK             0xfffff
>> +
>> +#define IPROC_CLK_PLLARMC_OFFSET                     0xc08
>> +#define IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT            8
>> +#define IPROC_CLK_PLLARMC_MDIV_MASK                  0xff
>> +
>> +#define IPROC_CLK_PLLARMCTL5_OFFSET                  0xc20
>> +#define IPROC_CLK_PLLARMCTL5_H_MDIV_MASK             0xff
>> +
>> +#define IPROC_CLK_PLLARM_OFFSET_OFFSET               0xc24
>> +#define IPROC_CLK_PLLARM_SW_CTL_SHIFT                29
>> +#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT       20
>> +#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK        0xff
>> +#define IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK       0xfffff
>> +
>> +#define IPROC_CLK_ARM_DIV_OFFSET                     0xe00
>> +#define IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT  4
>> +#define IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK        0xf
>> +
>> +#define IPROC_CLK_POLICY_DBG_OFFSET                  0xec0
>> +#define IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT          12
>> +#define IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK           0x7
>> +
>> +enum iproc_arm_pll_fid {
>> +       ARM_PLL_FID_CRYSTAL_CLK   = 0,
>> +       ARM_PLL_FID_SYS_CLK       = 2,
>> +       ARM_PLL_FID_CH0_SLOW_CLK  = 6,
>> +       ARM_PLL_FID_CH1_FAST_CLK  = 7
>> +};
>> +
>> +struct iproc_arm_pll {
>> +       struct clk_hw hw;
>> +       void __iomem *base;
>> +       struct clk_onecell_data clk_data;
>> +       unsigned long rate;
>> +};
>> +
>> +#define to_iproc_arm_pll(hw) container_of(hw, struct iproc_arm_pll, hw)
>> +
>> +static unsigned int __get_fid(struct iproc_arm_pll *pll)
>> +{
>> +       u32 val;
>> +       unsigned int policy, fid, active_fid;
>> +
>> +       val = readl(pll->base + IPROC_CLK_ARM_DIV_OFFSET);
>> +       if (val & (1 << IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT))
>> +               policy = val & IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK;
>> +       else
>> +               policy = 0;
>> +
>> +       /* something is seriously wrong */
>> +       BUG_ON(policy > IPROC_CLK_MAX_FREQ_POLICY);
>> +
>> +       val = readl(pll->base + IPROC_CLK_POLICY_FREQ_OFFSET);
>> +       fid = (val >> (IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT * policy)) &
>> +               IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK;
>> +
>> +       val = readl(pll->base + IPROC_CLK_POLICY_DBG_OFFSET);
>> +       active_fid = IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK &
>> +               (val >> IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT);
>> +       if (fid != active_fid) {
>> +               pr_debug("%s: fid override %u->%u\n", __func__, fid,
>> +                               active_fid);
>> +               fid = active_fid;
>> +       }
>> +
>> +       pr_debug("%s: active fid: %u\n", __func__, fid);
>> +
>> +       return fid;
>> +}
>> +
>> +/*
>> + * Determine the mdiv (post divider) based on the frequency ID being used.
>> + * There are 4 sources that can be used to derive the output clock rate:
>> + *    - 25 MHz Crystal
>> + *    - System clock
>> + *    - PLL channel 0 (slow clock)
>> + *    - PLL channel 1 (fast clock)
>> + */
>> +static int __get_mdiv(struct iproc_arm_pll *pll)
>> +{
>> +       unsigned int fid;
>> +       int mdiv;
>> +       u32 val;
>> +
>> +       fid = __get_fid(pll);
>> +
>> +       switch (fid) {
>> +       case ARM_PLL_FID_CRYSTAL_CLK:
>> +       case ARM_PLL_FID_SYS_CLK:
>> +               mdiv = 1;
>> +               break;
>> +
>> +       case ARM_PLL_FID_CH0_SLOW_CLK:
>> +               val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
>> +               mdiv = val & IPROC_CLK_PLLARMC_MDIV_MASK;
>> +               if (mdiv == 0)
>> +                       mdiv = 256;
>> +               break;
>> +
>> +       case ARM_PLL_FID_CH1_FAST_CLK:
>> +               val = readl(pll->base + IPROC_CLK_PLLARMCTL5_OFFSET);
>> +               mdiv = val & IPROC_CLK_PLLARMCTL5_H_MDIV_MASK;
>> +               if (mdiv == 0)
>> +                       mdiv = 256;
>> +               break;
>> +
>> +       default:
>> +               mdiv = -EFAULT;
>> +       }
>> +
>> +       return mdiv;
>> +}
>> +
>> +static unsigned int __get_ndiv(struct iproc_arm_pll *pll)
>> +{
>> +       u32 val;
>> +       unsigned int ndiv_int, ndiv_frac, ndiv;
>> +
>> +       val = readl(pll->base + IPROC_CLK_PLLARM_OFFSET_OFFSET);
>> +       if (val & (1 << IPROC_CLK_PLLARM_SW_CTL_SHIFT)) {
>> +               /*
>> +                * offset mode is active. Read the ndiv from the PLLARM OFFSET
>> +                * register
>> +                */
>> +               ndiv_int = (val >> IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT) &
>> +                       IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK;
>> +               if (ndiv_int == 0)
>> +                       ndiv_int = 256;
>> +
>> +               ndiv_frac = val & IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK;
>> +       } else {
>> +               /* offset mode not active */
>> +               val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
>> +               ndiv_int = (val >> IPROC_CLK_PLLARMA_NDIV_INT_SHIFT) &
>> +                       IPROC_CLK_PLLARMA_NDIV_INT_MASK;
>> +               if (ndiv_int == 0)
>> +                       ndiv_int = 1024;
>> +
>> +               val = readl(pll->base + IPROC_CLK_PLLARMB_OFFSET);
>> +               ndiv_frac = val & IPROC_CLK_PLLARMB_NDIV_FRAC_MASK;
>> +       }
>> +
>> +       ndiv = (ndiv_int << 20) | ndiv_frac;
>> +
>> +       return ndiv;
>> +}
>> +
>> +/*
>> + * The output frequency of the ARM PLL is calculated based on the ARM PLL
>> + * divider values:
>> + *   pdiv = ARM PLL pre-divider
>> + *   ndiv = ARM PLL multiplier
>> + *   mdiv = ARM PLL post divider
>> + *
>> + * The frequency is calculated by:
>> + *   ((ndiv * parent clock rate) / pdiv) / mdiv
>> + */
>> +static unsigned long iproc_arm_pll_recalc_rate(struct clk_hw *hw,
>> +               unsigned long parent_rate)
>> +{
>> +       struct iproc_arm_pll *pll = to_iproc_arm_pll(hw);
>> +       u32 val;
>> +       int mdiv;
>> +       u64 ndiv;
>> +       unsigned int pdiv;
>> +
>> +       /* in bypass mode, use parent rate */
>> +       val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
>> +       if (val & (1 << IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT)) {
>> +               pll->rate = parent_rate;
>> +               return pll->rate;
>> +       }
>> +
>> +       /* PLL needs to be locked */
>> +       val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
>> +       if (!(val & (1 << IPROC_CLK_PLLARMA_LOCK_SHIFT))) {
>> +               pll->rate = 0;
>> +               return 0;
>> +       }
>> +
>> +       pdiv = (val >> IPROC_CLK_PLLARMA_PDIV_SHIFT) &
>> +               IPROC_CLK_PLLARMA_PDIV_MASK;
>> +       if (pdiv == 0)
>> +               pdiv = 16;
>> +
>> +       ndiv = __get_ndiv(pll);
>> +       mdiv = __get_mdiv(pll);
>> +       if (mdiv <= 0) {
>> +               pll->rate = 0;
>> +               return 0;
>> +       }
>> +       pll->rate = (ndiv * parent_rate) >> 20;
>> +       pll->rate = (pll->rate / pdiv) / mdiv;
>> +
>> +       pr_debug("%s: ARM PLL rate: %lu. parent rate: %lu\n", __func__,
>> +                       pll->rate, parent_rate);
>> +       pr_debug("%s: ndiv_int: %u, pdiv: %u, mdiv: %d\n", __func__,
>> +                       (unsigned int)(ndiv >> 20), pdiv, mdiv);
>> +
>> +       return pll->rate;
>> +}
>> +
>> +static const struct clk_ops iproc_arm_pll_ops = {
>> +       .recalc_rate = iproc_arm_pll_recalc_rate,
>> +};
>> +
>> +void __init iproc_armpll_setup(struct device_node *node)
>> +{
>> +       int ret;
>> +       struct clk *clk;
>> +       struct iproc_arm_pll *pll;
>> +       struct clk_init_data init;
>> +       const char *parent_name;
>> +
>> +       pll = kzalloc(sizeof(*pll), GFP_KERNEL);
>> +       if (WARN_ON(!pll))
>> +               return;
>> +
>> +       pll->base = of_iomap(node, 0);
>> +       if (WARN_ON(!pll->base))
>> +               goto err_free_pll;
>> +
>> +       init.name = node->name;
>> +       init.ops = &iproc_arm_pll_ops;
>> +       init.flags = 0;
>> +       parent_name = of_clk_get_parent_name(node, 0);
>> +       init.parent_names = (parent_name ? &parent_name : NULL);
>> +       init.num_parents = (parent_name ? 1 : 0);
>> +       pll->hw.init = &init;
>> +
>> +       clk = clk_register(NULL, &pll->hw);
>> +       if (WARN_ON(IS_ERR(clk)))
>> +               goto err_iounmap;
>> +
>> +       pll->clk_data.clk_num = 1;
>> +       pll->clk_data.clks = &clk;
>> +
>> +       ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
>> +       if (WARN_ON(ret))
>> +               goto err_clk_unregister;
>> +
>> +       return;
>> +
>> +err_clk_unregister:
>> +       clk_unregister(clk);
>> +err_iounmap:
>> +       iounmap(pll->base);
>> +err_free_pll:
>> +       kfree(pll);
>> +}
>> diff --git a/drivers/clk/bcm/clk-iproc-asiu.c b/drivers/clk/bcm/clk-iproc-asiu.c
>> new file mode 100644
>> index 0000000..ab86b8c
>> --- /dev/null
>> +++ b/drivers/clk/bcm/clk-iproc-asiu.c
>> @@ -0,0 +1,275 @@
>> +/*
>> + * Copyright (C) 2014 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/err.h>
>> +#include <linux/clk-provider.h>
>> +#include <linux/io.h>
>> +#include <linux/of.h>
>> +#include <linux/clkdev.h>
>> +#include <linux/of_address.h>
>> +#include <linux/delay.h>
>> +
>> +#include "clk-iproc.h"
>> +
>> +struct iproc_asiu;
>> +
>> +struct iproc_asiu_clk {
>> +       struct clk_hw hw;
>> +       const char *name;
>> +       struct iproc_asiu *asiu;
>> +       unsigned long rate;
>> +       struct iproc_asiu_div div;
>> +       struct iproc_asiu_gate gate;
>> +};
>> +
>> +struct iproc_asiu {
>> +       void __iomem *div_base;
>> +       void __iomem *gate_base;
>> +
>> +       struct clk_onecell_data clk_data;
>> +       struct iproc_asiu_clk *clks;
>> +};
>> +
>> +#define to_asiu_clk(hw) container_of(hw, struct iproc_asiu_clk, hw)
>> +
>> +static int iproc_asiu_clk_enable(struct clk_hw *hw)
>> +{
>> +       struct iproc_asiu_clk *clk = to_asiu_clk(hw);
>> +       struct iproc_asiu *asiu = clk->asiu;
>> +       u32 val;
>> +
>> +       /* some clocks at the ASIU level are always enabled */
>> +       if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
>> +               return 0;
>> +
>> +       val = readl(asiu->gate_base + clk->gate.offset);
>> +       val |= (1 << clk->gate.en_shift);
>> +       writel(val, asiu->gate_base + clk->gate.offset);
>> +
>> +       return 0;
>> +}
>> +
>> +static void iproc_asiu_clk_disable(struct clk_hw *hw)
>> +{
>> +       struct iproc_asiu_clk *clk = to_asiu_clk(hw);
>> +       struct iproc_asiu *asiu = clk->asiu;
>> +       u32 val;
>> +
>> +       /* some clocks at the ASIU level are always enabled */
>> +       if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
>> +               return;
>> +
>> +       val = readl(asiu->gate_base + clk->gate.offset);
>> +       val &= ~(1 << clk->gate.en_shift);
>> +       writel(val, asiu->gate_base + clk->gate.offset);
>> +}
>> +
>> +static unsigned long iproc_asiu_clk_recalc_rate(struct clk_hw *hw,
>> +               unsigned long parent_rate)
>> +{
>> +       struct iproc_asiu_clk *clk = to_asiu_clk(hw);
>> +       struct iproc_asiu *asiu = clk->asiu;
>> +       u32 val;
>> +       unsigned int div_h, div_l;
>> +
>> +       if (parent_rate == 0) {
>> +               clk->rate = 0;
>> +               return 0;
>> +       }
>> +
>> +       /* if clock divisor is not enabled, simply return parent rate */
>> +       val = readl(asiu->div_base + clk->div.offset);
>> +       if ((val & (1 << clk->div.en_shift)) == 0) {
>> +               clk->rate = parent_rate;
>> +               return parent_rate;
>> +       }
>> +
>> +       /* clock rate = parent rate / (high_div + 1) + (low_div + 1) */
>> +       div_h = (val >> clk->div.high_shift) & bit_mask(clk->div.high_width);
>> +       div_h++;
>> +       div_l = (val >> clk->div.low_shift) & bit_mask(clk->div.low_width);
>> +       div_l++;
>> +
>> +       clk->rate = parent_rate / (div_h + div_l);
>> +       pr_debug("%s: rate: %lu. parent rate: %lu div_h: %u div_l: %u\n",
>> +               __func__, clk->rate, parent_rate, div_h, div_l);
>> +
>> +       return clk->rate;
>> +}
>> +
>> +static long iproc_asiu_clk_round_rate(struct clk_hw *hw, unsigned long rate,
>> +               unsigned long *parent_rate)
>> +{
>> +       unsigned int div;
>> +
>> +       if (rate == 0 || *parent_rate == 0)
>> +               return -EINVAL;
>> +
>> +       if (rate == *parent_rate)
>> +               return *parent_rate;
>> +
>> +       div = DIV_ROUND_UP(*parent_rate, rate);
>> +       if (div < 2)
>> +               return *parent_rate;
>> +
>> +       return *parent_rate / div;
>> +}
>> +
>> +static int iproc_asiu_clk_set_rate(struct clk_hw *hw, unsigned long rate,
>> +               unsigned long parent_rate)
>> +{
>> +       struct iproc_asiu_clk *clk = to_asiu_clk(hw);
>> +       struct iproc_asiu *asiu = clk->asiu;
>> +       unsigned int div, div_h, div_l;
>> +       u32 val;
>> +
>> +       if (rate == 0 || parent_rate == 0)
>> +               return -EINVAL;
>> +
>> +       /* simply disable the divisor if one wants the same rate as parent */
>> +       if (rate == parent_rate) {
>> +               val = readl(asiu->div_base + clk->div.offset);
>> +               val &= ~(1 << clk->div.en_shift);
>> +               writel(val, asiu->div_base + clk->div.offset);
>> +               return 0;
>> +       }
>> +
>> +       div = DIV_ROUND_UP(parent_rate, rate);
>> +       if (div < 2)
>> +               return -EINVAL;
>> +
>> +       div_h = div_l = div >> 1;
>> +       div_h--;
>> +       div_l--;
>> +
>> +       val = readl(asiu->div_base + clk->div.offset);
>> +       val |= 1 << clk->div.en_shift;
>> +       if (div_h) {
>> +               val &= ~(bit_mask(clk->div.high_width)
>> +                               << clk->div.high_shift);
>> +               val |= div_h << clk->div.high_shift;
>> +       } else {
>> +               val &= ~(bit_mask(clk->div.high_width)
>> +                               << clk->div.high_shift);
>> +       }
>> +       if (div_l) {
>> +               val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
>> +               val |= div_l << clk->div.low_shift;
>> +       } else {
>> +               val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
>> +       }
>> +       writel(val, asiu->div_base + clk->div.offset);
>> +
>> +       return 0;
>> +}
>> +
>> +static const struct clk_ops iproc_asiu_ops = {
>> +       .enable = iproc_asiu_clk_enable,
>> +       .disable = iproc_asiu_clk_disable,
>> +       .recalc_rate = iproc_asiu_clk_recalc_rate,
>> +       .round_rate = iproc_asiu_clk_round_rate,
>> +       .set_rate = iproc_asiu_clk_set_rate,
>> +};
>> +
>> +void __init iproc_asiu_setup(struct device_node *node,
>> +               const struct iproc_asiu_div *div,
>> +               const struct iproc_asiu_gate *gate, unsigned int num_clks)
>> +{
>> +       int i, ret;
>> +       struct iproc_asiu *asiu;
>> +
>> +       if (WARN_ON(!gate || !div))
>> +               return;
>> +
>> +       asiu = kzalloc(sizeof(*asiu), GFP_KERNEL);
>> +       if (WARN_ON(!asiu))
>> +               return;
>> +
>> +       asiu->clk_data.clk_num = num_clks;
>> +       asiu->clk_data.clks = kcalloc(num_clks, sizeof(*asiu->clk_data.clks),
>> +                       GFP_KERNEL);
>> +       if (WARN_ON(!asiu->clk_data.clks))
>> +               goto err_clks;
>> +
>> +       asiu->clks = kcalloc(num_clks, sizeof(*asiu->clks), GFP_KERNEL);
>> +       if (WARN_ON(!asiu->clks))
>> +               goto err_asiu_clks;
>> +
>> +       asiu->div_base = of_iomap(node, 0);
>> +       if (WARN_ON(!asiu->div_base))
>> +               goto err_iomap_div;
>> +
>> +       asiu->gate_base = of_iomap(node, 1);
>> +       if (WARN_ON(!asiu->gate_base))
>> +               goto err_iomap_gate;
>> +
>> +       for (i = 0; i < num_clks; i++) {
>> +               struct clk_init_data init;
>> +               struct clk *clk;
>> +               const char *parent_name;
>> +               struct iproc_asiu_clk *asiu_clk;
>> +               const char *clk_name;
>> +
>> +               clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
>> +               if (WARN_ON(!clk_name))
>> +                       goto err_clk_register;
>> +
>> +               ret = of_property_read_string_index(node, "clock-output-names",
>> +                               i, &clk_name);
>> +               if (WARN_ON(ret))
>> +                       goto err_clk_register;
>> +
>> +               asiu_clk = &asiu->clks[i];
>> +               asiu_clk->name = clk_name;
>> +               asiu_clk->asiu = asiu;
>> +               asiu_clk->div = div[i];
>> +               asiu_clk->gate = gate[i];
>> +               init.name = clk_name;
>> +               init.ops = &iproc_asiu_ops;
>> +               init.flags = 0;
>> +               parent_name = of_clk_get_parent_name(node, 0);
>> +               init.parent_names = (parent_name ? &parent_name : NULL);
>> +               init.num_parents = (parent_name ? 1 : 0);
>> +               asiu_clk->hw.init = &init;
>> +
>> +               clk = clk_register(NULL, &asiu_clk->hw);
>> +               if (WARN_ON(IS_ERR(clk)))
>> +                       goto err_clk_register;
>> +               asiu->clk_data.clks[i] = clk;
>> +       }
>> +
>> +       ret = of_clk_add_provider(node, of_clk_src_onecell_get,
>> +                       &asiu->clk_data);
>> +       if (WARN_ON(ret))
>> +               goto err_clk_register;
>> +
>> +       return;
>> +
>> +err_clk_register:
>> +       for (i = 0; i < num_clks; i++)
>> +               kfree(asiu->clks[i].name);
>> +       iounmap(asiu->gate_base);
>> +
>> +err_iomap_gate:
>> +       iounmap(asiu->div_base);
>> +
>> +err_iomap_div:
>> +       kfree(asiu->clks);
>> +
>> +err_asiu_clks:
>> +       kfree(asiu->clk_data.clks);
>> +
>> +err_clks:
>> +       kfree(asiu);
>> +}
>> diff --git a/drivers/clk/bcm/clk-iproc-clk.c b/drivers/clk/bcm/clk-iproc-clk.c
>> new file mode 100644
>> index 0000000..be3c42c
>> --- /dev/null
>> +++ b/drivers/clk/bcm/clk-iproc-clk.c
>> @@ -0,0 +1,238 @@
>> +/*
>> + * Copyright (C) 2014 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/err.h>
>> +#include <linux/clk-provider.h>
>> +#include <linux/io.h>
>> +#include <linux/of.h>
>> +#include <linux/clkdev.h>
>> +#include <linux/of_address.h>
>> +#include <linux/delay.h>
>> +
>> +#include "clk-iproc.h"
>> +
>> +struct iproc_pll;
>> +
>> +struct iproc_clk {
>> +       struct clk_hw hw;
>> +       const char *name;
>> +       struct iproc_pll *pll;
>> +       unsigned long rate;
>> +       const struct iproc_clk_ctrl *ctrl;
>> +};
>> +
>> +struct iproc_pll {
>> +       void __iomem *base;
>> +       struct clk_onecell_data clk_data;
>> +       struct iproc_clk *clks;
>> +};
>> +
>> +#define to_iproc_clk(hw) container_of(hw, struct iproc_clk, hw)
>> +
>> +static int iproc_clk_enable(struct clk_hw *hw)
>> +{
>> +       struct iproc_clk *clk = to_iproc_clk(hw);
>> +       const struct iproc_clk_ctrl *ctrl = clk->ctrl;
>> +       struct iproc_pll *pll = clk->pll;
>> +       u32 val;
>> +
>> +       /* channel enable is active low */
>> +       val = readl(pll->base + ctrl->enable.offset);
>> +       val &= ~(1 << ctrl->enable.enable_shift);
>> +       writel(val, pll->base + ctrl->enable.offset);
>> +
>> +       /* also make sure channel is not held */
>> +       val = readl(pll->base + ctrl->enable.offset);
>> +       val &= ~(1 << ctrl->enable.hold_shift);
>> +       writel(val, pll->base + ctrl->enable.offset);
>> +
>> +       return 0;
>> +}
>> +
>> +static void iproc_clk_disable(struct clk_hw *hw)
>> +{
>> +       struct iproc_clk *clk = to_iproc_clk(hw);
>> +       const struct iproc_clk_ctrl *ctrl = clk->ctrl;
>> +       struct iproc_pll *pll = clk->pll;
>> +       u32 val;
>> +
>> +       if (ctrl->flags & IPROC_CLK_AON)
>> +               return;
>> +
>> +       val = readl(pll->base + ctrl->enable.offset);
>> +       val |= 1 << ctrl->enable.enable_shift;
>> +       writel(val, pll->base + ctrl->enable.offset);
>> +}
>> +
>> +static unsigned long iproc_clk_recalc_rate(struct clk_hw *hw,
>> +               unsigned long parent_rate)
>> +{
>> +       struct iproc_clk *clk = to_iproc_clk(hw);
>> +       const struct iproc_clk_ctrl *ctrl = clk->ctrl;
>> +       struct iproc_pll *pll = clk->pll;
>> +       u32 val;
>> +       unsigned int mdiv;
>> +
>> +       if (parent_rate == 0)
>> +               return 0;
>> +
>> +       val = readl(pll->base + ctrl->mdiv.offset);
>> +       mdiv = (val >> ctrl->mdiv.shift) & bit_mask(ctrl->mdiv.width);
>> +       if (mdiv == 0)
>> +               mdiv = 256;
>> +
>> +       clk->rate = parent_rate / mdiv;
>> +
>> +       return clk->rate;
>> +}
>> +
>> +static long iproc_clk_round_rate(struct clk_hw *hw, unsigned long rate,
>> +               unsigned long *parent_rate)
>> +{
>> +       unsigned int div;
>> +
>> +       if (rate == 0 || *parent_rate == 0)
>> +               return -EINVAL;
>> +
>> +       if (rate == *parent_rate)
>> +               return *parent_rate;
>> +
>> +       div = DIV_ROUND_UP(*parent_rate, rate);
>> +       if (div < 2)
>> +               return *parent_rate;
>> +
>> +       if (div > 256)
>> +               div = 256;
>> +
>> +       return *parent_rate / div;
>> +}
>> +
>> +static int iproc_clk_set_rate(struct clk_hw *hw, unsigned long rate,
>> +               unsigned long parent_rate)
>> +{
>> +       struct iproc_clk *clk = to_iproc_clk(hw);
>> +       const struct iproc_clk_ctrl *ctrl = clk->ctrl;
>> +       struct iproc_pll *pll = clk->pll;
>> +       u32 val;
>> +       unsigned int div;
>> +
>> +       if (rate == 0 || parent_rate == 0)
>> +               return -EINVAL;
>> +
>> +       div = DIV_ROUND_UP(parent_rate, rate);
>> +       if (div > 256)
>> +               return -EINVAL;
>> +
>> +       val = readl(pll->base + ctrl->mdiv.offset);
>> +       if (div == 256) {
>> +               val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
>> +       } else {
>> +               val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
>> +               val |= div << ctrl->mdiv.shift;
>> +       }
>> +       writel(val, pll->base + ctrl->mdiv.offset);
>> +       clk->rate = parent_rate / div;
>> +
>> +       return 0;
>> +}
>> +
>> +static const struct clk_ops iproc_clk_ops = {
>> +       .enable = iproc_clk_enable,
>> +       .disable = iproc_clk_disable,
>> +       .recalc_rate = iproc_clk_recalc_rate,
>> +       .round_rate = iproc_clk_round_rate,
>> +       .set_rate = iproc_clk_set_rate,
>> +};
>> +
>> +void __init iproc_clk_setup(struct device_node *node,
>> +               const struct iproc_clk_ctrl *ctrl, unsigned int num_clks)
>> +{
>> +       int i, ret;
>> +       struct iproc_pll *pll;
>> +
>> +       if (WARN_ON(!ctrl))
>> +               return;
>> +
>> +       pll = kzalloc(sizeof(*pll), GFP_KERNEL);
>> +       if (WARN_ON(!pll))
>> +               return;
>> +
>> +       pll->clk_data.clk_num = num_clks;
>> +       pll->clk_data.clks = kcalloc(num_clks, sizeof(*pll->clk_data.clks),
>> +                       GFP_KERNEL);
>> +       if (WARN_ON(!pll->clk_data.clks))
>> +               goto err_clks;
>> +
>> +       pll->clks = kcalloc(num_clks, sizeof(*pll->clks), GFP_KERNEL);
>> +       if (WARN_ON(!pll->clks))
>> +               goto err_pll_clks;
>> +
>> +       pll->base = of_iomap(node, 0);
>> +       if (WARN_ON(!pll->base))
>> +               goto err_iomap;
>> +
>> +       for (i = 0; i < num_clks; i++) {
>> +               struct clk_init_data init;
>> +               struct clk *clk;
>> +               const char *parent_name;
>> +               struct iproc_clk *iclk;
>> +               const char *clk_name;
>> +
>> +               clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
>> +               if (WARN_ON(!clk_name))
>> +                       goto err_clk_register;
>> +
>> +               ret = of_property_read_string_index(node, "clock-output-names",
>> +                               i, &clk_name);
>> +               if (WARN_ON(ret))
>> +                       goto err_clk_register;
>> +
>> +               iclk = &pll->clks[i];
>> +               iclk->name = clk_name;
>> +               iclk->pll = pll;
>> +               iclk->ctrl = &ctrl[i];
>> +               init.name = clk_name;
>> +               init.ops = &iproc_clk_ops;
>> +               init.flags = 0;
>> +               parent_name = of_clk_get_parent_name(node, 0);
>> +               init.parent_names = (parent_name ? &parent_name : NULL);
>> +               init.num_parents = (parent_name ? 1 : 0);
>> +               iclk->hw.init = &init;
>> +
>> +               clk = clk_register(NULL, &iclk->hw);
>> +               if (WARN_ON(IS_ERR(clk)))
>> +                       goto err_clk_register;
>> +               pll->clk_data.clks[i] = clk;
>> +       }
>> +
>> +       ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
>> +       if (WARN_ON(ret))
>> +               goto err_clk_register;
>> +
>> +       return;
>> +
>> +err_clk_register:
>> +       for (i = 0; i < num_clks; i++)
>> +               kfree(pll->clks[i].name);
>> +       iounmap(pll->base);
>> +
>> +err_iomap:
>> +       kfree(pll->clks);
>> +
>> +err_pll_clks:
>> +       kfree(pll->clk_data.clks);
>> +
>> +err_clks:
>> +       kfree(pll);
>> +}
>> diff --git a/drivers/clk/bcm/clk-iproc-pll.c b/drivers/clk/bcm/clk-iproc-pll.c
>> new file mode 100644
>> index 0000000..cd3bd38
>> --- /dev/null
>> +++ b/drivers/clk/bcm/clk-iproc-pll.c
>> @@ -0,0 +1,483 @@
>> +/*
>> + * Copyright (C) 2014 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/err.h>
>> +#include <linux/clk-provider.h>
>> +#include <linux/io.h>
>> +#include <linux/of.h>
>> +#include <linux/clkdev.h>
>> +#include <linux/of_address.h>
>> +#include <linux/delay.h>
>> +
>> +#include "clk-iproc.h"
>> +
>> +#define PLL_VCO_HIGH_SHIFT 19
>> +#define PLL_VCO_LOW_SHIFT  30
>> +
>> +/* number of delay loops waiting for PLL to lock */
>> +#define LOCK_DELAY 100
>> +
>> +/* number of VCO frequency bands */
>> +#define NUM_FREQ_BANDS 8
>> +
>> +#define NUM_KP_BANDS 3
>> +enum kp_band {
>> +       KP_BAND_MID = 0,
>> +       KP_BAND_HIGH,
>> +       KP_BAND_HIGH_HIGH
>> +};
>> +
>> +static const unsigned int kp_table[NUM_KP_BANDS][NUM_FREQ_BANDS] = {
>> +       { 5, 6, 6, 7, 7, 8, 9, 10 },
>> +       { 4, 4, 5, 5, 6, 7, 8, 9  },
>> +       { 4, 5, 5, 6, 7, 8, 9, 10 },
>> +};
>> +
>> +static const unsigned long ref_freq_table[NUM_FREQ_BANDS][2] = {
>> +       { 10000000,  12500000  },
>> +       { 12500000,  15000000  },
>> +       { 15000000,  20000000  },
>> +       { 20000000,  25000000  },
>> +       { 25000000,  50000000  },
>> +       { 50000000,  75000000  },
>> +       { 75000000,  100000000 },
>> +       { 100000000, 125000000 },
>> +};
>> +
>> +enum vco_freq_range {
>> +       VCO_LOW       = 700000000U,
>> +       VCO_MID       = 1200000000U,
>> +       VCO_HIGH      = 2200000000U,
>> +       VCO_HIGH_HIGH = 3100000000U,
>> +       VCO_MAX       = 4000000000U,
>> +};
>> +
>> +struct iproc_pll {
>> +       struct clk_hw hw;
>> +       void __iomem *pll_base;
>> +       void __iomem *pwr_base;
>> +       void __iomem *asiu_base;
>> +       struct clk_onecell_data clk_data;
>> +       const char *name;
>> +       const struct iproc_pll_ctrl *ctrl;
>> +       const struct iproc_pll_vco_freq_param *vco_param;
>> +       unsigned int num_vco_entries;
>> +       unsigned long rate;
>> +};
>> +
>> +#define to_iproc_pll(hw) container_of(hw, struct iproc_pll, hw)
>> +
>> +/*
>> + * Get the clock rate based on name
>> + */
>> +static unsigned long __get_rate(const char *clk_name)
>> +{
>> +       struct clk *clk;
>> +
>> +       clk = __clk_lookup(clk_name);
>> +       if (!clk) {
>> +               pr_err("%s: unable to find clock by name: %s\n", __func__,
>> +                               clk_name);
>> +               return 0;
>> +       }
>> +
>> +       return clk_get_rate(clk);
>> +}
>> +
>> +/*
>> + * Based on the target frequency, find a match from the VCO frequency parameter
>> + * table and return its index
>> + */
>> +static int pll_get_rate_index(struct iproc_pll *pll, unsigned int target_rate)
>> +{
>> +       int i;
>> +
>> +       for (i = 0; i < pll->num_vco_entries; i++)
>> +               if (target_rate == pll->vco_param[i].rate)
>> +                       break;
>> +
>> +       if (i >= pll->num_vco_entries)
>> +               return -EINVAL;
>> +
>> +       return i;
>> +}
>> +
>> +static int get_kp(unsigned long ref_freq, enum kp_band kp_index)
>> +{
>> +       int i;
>> +
>> +       if (ref_freq < ref_freq_table[0][0])
>> +               return -EINVAL;
>> +
>> +       for (i = 0; i < NUM_FREQ_BANDS; i++) {
>> +               if (ref_freq >= ref_freq_table[i][0] &&
>> +                       ref_freq < ref_freq_table[i][1])
>> +                       return kp_table[kp_index][i];
>> +       }
>> +       return -EINVAL;
>> +}
>> +
>> +static int pll_wait_for_lock(struct iproc_pll *pll)
>> +{
>> +       int i;
>> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
>> +
>> +       for (i = 0; i < LOCK_DELAY; i++) {
>> +               u32 val = readl(pll->pll_base + ctrl->status.offset);
>> +
>> +               if (val & (1 << ctrl->status.shift))
>> +                       return 0;
>> +               udelay(10);
>> +       }
>> +
>> +       return -EIO;
>> +}
>> +
>> +static void __pll_disable(struct iproc_pll *pll)
>> +{
>> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
>> +       u32 val;
>> +
>> +       if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
>> +               val = readl(pll->asiu_base + ctrl->asiu.offset);
>> +               val &= ~(1 << ctrl->asiu.en_shift);
>> +               writel(val, pll->asiu_base + ctrl->asiu.offset);
>> +       }
>> +
>> +       /* latch input value so core power can be shut down */
>> +       val = readl(pll->pwr_base + ctrl->aon.offset);
>> +       val |= (1 << ctrl->aon.iso_shift);
>> +       writel(val, pll->pwr_base + ctrl->aon.offset);
>> +
>> +       /* power down the core */
>> +       val &= ~(bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift);
>> +       writel(val, pll->pwr_base + ctrl->aon.offset);
>> +}
>> +
>> +static int __pll_enable(struct iproc_pll *pll)
>> +{
>> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
>> +       u32 val;
>> +
>> +       /* power up the PLL and make sure it's not latched */
>> +       val = readl(pll->pwr_base + ctrl->aon.offset);
>> +       val |= bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift;
>> +       val &= ~(1 << ctrl->aon.iso_shift);
>> +       writel(val, pll->pwr_base + ctrl->aon.offset);
>> +
>> +       /* certain PLLs also need to be ungated from the ASIU top level */
>> +       if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
>> +               val = readl(pll->asiu_base + ctrl->asiu.offset);
>> +               val |= (1 << ctrl->asiu.en_shift);
>> +               writel(val, pll->asiu_base + ctrl->asiu.offset);
>> +       }
>> +
>> +       return 0;
>> +}
>> +
>> +static void __pll_put_in_reset(struct iproc_pll *pll)
>> +{
>> +       u32 val;
>> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
>> +       const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
>> +
>> +       val = readl(pll->pll_base + reset->offset);
>> +       val &= ~(1 << reset->reset_shift | 1 << reset->p_reset_shift);
>> +       writel(val, pll->pll_base + reset->offset);
>> +}
>> +
>> +static void __pll_bring_out_reset(struct iproc_pll *pll, unsigned int kp,
>> +               unsigned int ka, unsigned int ki)
>> +{
>> +       u32 val;
>> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
>> +       const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
>> +
>> +       val = readl(pll->pll_base + reset->offset);
>> +       val &= ~(bit_mask(reset->ki_width) << reset->ki_shift |
>> +               bit_mask(reset->kp_width) << reset->kp_shift |
>> +               bit_mask(reset->ka_width) << reset->ka_shift);
>> +       val |=  ki << reset->ki_shift | kp << reset->kp_shift |
>> +               ka << reset->ka_shift;
>> +       val |= 1 << reset->reset_shift | 1 << reset->p_reset_shift;
>> +       writel(val, pll->pll_base + reset->offset);
>> +}
>> +
>> +static int pll_set_rate(struct iproc_pll *pll, unsigned int rate_index,
>> +               unsigned long parent_rate)
>> +{
>> +       const struct iproc_pll_vco_freq_param *vco =
>> +                               &pll->vco_param[rate_index];
>> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
>> +       int ka = 0, ki, kp, ret;
>> +       unsigned long rate = vco->rate;
>> +       u32 val;
>> +       enum kp_band kp_index;
>> +       unsigned long ref_freq;
>> +
>> +       /*
>> +        * reference frequency = parent frequency / PDIV
>> +        * If PDIV = 0, then it becomes a multiplier (x2)
>> +        */
>> +       if (vco->pdiv == 0)
>> +               ref_freq = parent_rate * 2;
>> +       else
>> +               ref_freq = parent_rate / vco->pdiv;
>> +
>> +       /* determine Ki and Kp index based on target VCO frequency */
>> +       if (rate >= VCO_LOW && rate < VCO_HIGH) {
>> +               ki = 4;
>> +               kp_index = KP_BAND_MID;
>> +       } else if (rate >= VCO_HIGH && rate && rate < VCO_HIGH_HIGH) {
>> +               ki = 3;
>> +               kp_index = KP_BAND_HIGH;
>> +       } else if (rate >= VCO_HIGH_HIGH && rate < VCO_MAX) {
>> +               ki = 3;
>> +               kp_index = KP_BAND_HIGH_HIGH;
>> +       } else {
>> +               pr_err("%s: pll: %s has invalid rate: %lu\n", __func__,
>> +                               pll->name, rate);
>> +               return -EINVAL;
>> +       }
>> +
>> +       kp = get_kp(ref_freq, kp_index);
>> +       if (kp < 0) {
>> +               pr_err("%s: pll: %s has invalid kp\n", __func__, pll->name);
>> +               return kp;
>> +       }
>> +
>> +       ret = __pll_enable(pll);
>> +       if (ret) {
>> +               pr_err("%s: pll: %s fails to enable\n", __func__, pll->name);
>> +               return ret;
>> +       }
>> +
>> +       /* put PLL in reset */
>> +       __pll_put_in_reset(pll);
>> +
>> +       writel(0, pll->pll_base + ctrl->vco_ctrl.u_offset);
>> +       val = readl(pll->pll_base + ctrl->vco_ctrl.l_offset);
>> +
>> +       if (rate >= VCO_LOW && rate < VCO_MID)
>> +               val |= (1 << PLL_VCO_LOW_SHIFT);
>> +
>> +       if (rate < VCO_HIGH)
>> +               val &= ~(1 << PLL_VCO_HIGH_SHIFT);
>> +       else
>> +               val |= (1 << PLL_VCO_HIGH_SHIFT);
>> +
>> +       writel(val, pll->pll_base + ctrl->vco_ctrl.l_offset);
>> +
>> +       /* program integer part of NDIV */
>> +       val = readl(pll->pll_base + ctrl->ndiv_int.offset);
>> +       val &= ~(bit_mask(ctrl->ndiv_int.width) << ctrl->ndiv_int.shift);
>> +       val |= vco->ndiv_int << ctrl->ndiv_int.shift;
>> +       writel(val, pll->pll_base + ctrl->ndiv_int.offset);
>> +
>> +       /* program fractional part of NDIV */
>> +       if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
>> +               val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
>> +               val &= ~(bit_mask(ctrl->ndiv_frac.width) <<
>> +                               ctrl->ndiv_frac.shift);
>> +               val |= vco->ndiv_frac << ctrl->ndiv_frac.shift;
>> +               writel(val, pll->pll_base + ctrl->ndiv_frac.offset);
>> +       }
>> +
>> +       /* program PDIV */
>> +       val = readl(pll->pll_base + ctrl->pdiv.offset);
>> +       val &= ~(bit_mask(ctrl->pdiv.width) << ctrl->pdiv.shift);
>> +       val |= vco->pdiv << ctrl->pdiv.shift;
>> +       writel(val, pll->pll_base + ctrl->pdiv.offset);
>> +
>> +       __pll_bring_out_reset(pll, kp, ka, ki);
>> +
>> +       ret = pll_wait_for_lock(pll);
>> +       if (ret < 0) {
>> +               pr_err("%s: pll: %s failed to lock\n", __func__, pll->name);
>> +               return ret;
>> +       }
>> +
>> +       return 0;
>> +}
>> +
>> +static int iproc_pll_enable(struct clk_hw *hw)
>> +{
>> +       struct iproc_pll *pll = to_iproc_pll(hw);
>> +
>> +       return __pll_enable(pll);
>> +}
>> +
>> +static void iproc_pll_disable(struct clk_hw *hw)
>> +{
>> +       struct iproc_pll *pll = to_iproc_pll(hw);
>> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
>> +
>> +       if (ctrl->flags & IPROC_CLK_AON)
>> +               return;
>> +
>> +       __pll_disable(pll);
>> +}
>> +
>> +static unsigned long iproc_pll_recalc_rate(struct clk_hw *hw,
>> +       unsigned long parent_rate)
>> +{
>> +       struct iproc_pll *pll = to_iproc_pll(hw);
>> +       const struct iproc_pll_ctrl *ctrl = pll->ctrl;
>> +       u32 val;
>> +       u64 ndiv;
>> +       unsigned int ndiv_int, ndiv_frac, pdiv;
>> +
>> +       if (parent_rate == 0)
>> +               return 0;
>> +
>> +       /* PLL needs to be locked */
>> +       val = readl(pll->pll_base + ctrl->status.offset);
>> +       if ((val & (1 << ctrl->status.shift)) == 0) {
>> +               pll->rate = 0;
>> +               return 0;
>> +       }
>> +
>> +       /*
>> +        * PLL output frequency =
>> +        *
>> +        * ((ndiv_int + ndiv_frac / 2^20) * (parent clock rate / pdiv)
>> +        */
>> +       val = readl(pll->pll_base + ctrl->ndiv_int.offset);
>> +       ndiv_int = (val >> ctrl->ndiv_int.shift) &
>> +               bit_mask(ctrl->ndiv_int.width);
>> +       ndiv = ndiv_int << ctrl->ndiv_int.shift;
>> +
>> +       if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
>> +               val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
>> +               ndiv_frac = (val >> ctrl->ndiv_frac.shift) &
>> +                       bit_mask(ctrl->ndiv_frac.width);
>> +
>> +               if (ndiv_frac != 0)
>> +                       ndiv = (ndiv_int << ctrl->ndiv_int.shift) | ndiv_frac;
>> +       }
>> +
>> +       val = readl(pll->pll_base + ctrl->pdiv.offset);
>> +       pdiv = (val >> ctrl->pdiv.shift) & bit_mask(ctrl->pdiv.width);
>> +
>> +       pll->rate = (ndiv * parent_rate) >> ctrl->ndiv_int.shift;
>> +
>> +       if (pdiv == 0)
>> +               pll->rate *= 2;
>> +       else
>> +               pll->rate /= pdiv;
>> +
>> +       return pll->rate;
>> +}
>> +
>> +static const struct clk_ops iproc_pll_ops = {
>> +       .enable = iproc_pll_enable,
>> +       .disable = iproc_pll_disable,
>> +       .recalc_rate = iproc_pll_recalc_rate,
>> +};
>> +
>> +void __init iproc_pll_setup(struct device_node *node,
>> +               const struct iproc_pll_ctrl *ctrl,
>> +               const struct iproc_pll_vco_freq_param *vco_param,
>> +               unsigned int num_vco_entries)
>> +{
>> +       int ret;
>> +       struct clk *clk;
>> +       struct iproc_pll *pll;
>> +       struct clk_init_data init;
>> +       const char *parent_name;
>> +       unsigned int rate;
>> +
>> +       if (WARN_ON(!ctrl))
>> +               return;
>> +
>> +       pll = kzalloc(sizeof(*pll), GFP_KERNEL);
>> +       if (WARN_ON(!pll))
>> +               return;
>> +
>> +       pll->pll_base = of_iomap(node, 0);
>> +       if (WARN_ON(!pll->pll_base))
>> +               goto err_pll_iomap;
>> +
>> +       pll->pwr_base = of_iomap(node, 1);
>> +       if (WARN_ON(!pll->pwr_base))
>> +               goto err_pwr_iomap;
>> +
>> +       /* some PLLs require gating control at the top ASIU level */
>> +       if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
>> +               pll->asiu_base = of_iomap(node, 2);
>> +               if (WARN_ON(!pll->asiu_base))
>> +                       goto err_asiu_iomap;
>> +       }
>> +
>> +       pll->ctrl = ctrl;
>> +       pll->name = node->name;
>> +       init.name = node->name;
>> +       init.ops = &iproc_pll_ops;
>> +       init.flags = 0;
>> +       parent_name = of_clk_get_parent_name(node, 0);
>> +       init.parent_names = (parent_name ? &parent_name : NULL);
>> +       init.num_parents = (parent_name ? 1 : 0);
>> +       pll->hw.init = &init;
>> +
>> +       /* configure the PLL to the desired VCO frequency if specified */
>> +       ret = of_property_read_u32(node, "clock-frequency", &rate);
>> +       if (!ret) {
>> +               unsigned long parent_rate;
>> +               int rate_index;
>> +
>> +               if (WARN_ON(!vco_param))
>> +                       goto err_clk_register;
>> +
>> +               pll->num_vco_entries = num_vco_entries;
>> +               pll->vco_param = vco_param;
>> +
>> +               parent_rate = __get_rate(parent_name);
>> +               if (WARN_ON(!parent_rate))
>> +                       goto err_clk_register;
>> +
>> +               rate_index = pll_get_rate_index(pll, rate);
>> +               if (WARN_ON(rate_index < 0))
>> +                       goto err_clk_register;
>> +
>> +               ret = pll_set_rate(pll, rate_index, parent_rate);
>> +               if (WARN_ON(ret))
>> +                       goto err_clk_register;
>> +       }
>> +
>> +       clk = clk_register(NULL, &pll->hw);
>> +       if (WARN_ON(IS_ERR(clk)))
>> +               goto err_clk_register;
>> +
>> +       pll->clk_data.clk_num = 1;
>> +       pll->clk_data.clks = &clk;
>> +
>> +       ret = of_clk_add_provider(node, of_clk_src_onecell_get,
>> +                       &pll->clk_data);
>> +       if (WARN_ON(ret))
>> +               goto err_clk_add;
>> +
>> +       return;
>> +
>> +err_clk_add:
>> +       clk_unregister(clk);
>> +err_clk_register:
>> +       if (pll->asiu_base)
>> +               iounmap(pll->asiu_base);
>> +err_asiu_iomap:
>> +       iounmap(pll->pwr_base);
>> +err_pwr_iomap:
>> +       iounmap(pll->pll_base);
>> +err_pll_iomap:
>> +       kfree(pll);
>> +}
>> diff --git a/drivers/clk/bcm/clk-iproc.h b/drivers/clk/bcm/clk-iproc.h
>> new file mode 100644
>> index 0000000..4aa0479
>> --- /dev/null
>> +++ b/drivers/clk/bcm/clk-iproc.h
>> @@ -0,0 +1,155 @@
>> +/*
>> + * Copyright (C) 2014 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#ifndef _CLK_IPROC_H
>> +#define _CLK_IPROC_H
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/list.h>
>> +#include <linux/spinlock.h>
>> +#include <linux/slab.h>
>> +#include <linux/device.h>
>> +#include <linux/of.h>
>> +#include <linux/clk-provider.h>
>> +
>> +#define IPROC_CLK_NAME_LEN 25
>> +#define IPROC_CLK_INVALID_OFFSET 0xffffffff
>> +#define bit_mask(width) ((1 << (width)) - 1)
>> +
>> +/* clock should not be disabled at runtime */
>> +#define IPROC_CLK_AON BIT(0)
>> +
>> +/* PLL requires gating through ASIU */
>> +#define IPROC_CLK_PLL_ASIU BIT(1)
>> +
>> +/* PLL has fractional part of the NDIV */
>> +#define IPROC_CLK_PLL_HAS_NDIV_FRAC BIT(2)
>> +
>> +/*
>> + * Parameters for VCO frequency configuration
>> + *
>> + * VCO frequency =
>> + * ((ndiv_int + ndiv_frac / 2^20) * (ref freqeuncy  / pdiv)
>> + */
>> +struct iproc_pll_vco_freq_param {
>> +       unsigned long rate;
>> +       unsigned int ndiv_int;
>> +       unsigned int ndiv_frac;
>> +       unsigned int pdiv;
>> +};
>> +
>> +struct iproc_clk_reg_op {
>> +       unsigned int offset;
>> +       unsigned int shift;
>> +       unsigned int width;
>> +};
>> +
>> +/*
>> + * Clock gating control at the top ASIU level
>> + */
>> +struct iproc_asiu_gate {
>> +       unsigned int offset;
>> +       unsigned int en_shift;
>> +};
>> +
>> +/*
>> + * Control of powering on/off of a PLL
>> + *
>> + * Before powering off a PLL, input isolation (ISO) needs to be enabled
>> + */
>> +struct iproc_pll_aon_pwr_ctrl {
>> +       unsigned int offset;
>> +       unsigned int pwr_width;
>> +       unsigned int pwr_shift;
>> +       unsigned int iso_shift;
>> +};
>> +
>> +/*
>> + * Control of the PLL reset, with Ki, Kp, and Ka parameters
>> + */
>> +struct iproc_pll_reset_ctrl {
>> +       unsigned int offset;
>> +       unsigned int reset_shift;
>> +       unsigned int p_reset_shift;
>> +       unsigned int ki_shift;
>> +       unsigned int ki_width;
>> +       unsigned int kp_shift;
>> +       unsigned int kp_width;
>> +       unsigned int ka_shift;
>> +       unsigned int ka_width;
>> +};
>> +
>> +struct iproc_pll_vco_ctrl {
>> +       unsigned int u_offset;
>> +       unsigned int l_offset;
>> +};
>> +
>> +/*
>> + * Main PLL control parameters
>> + */
>> +struct iproc_pll_ctrl {
>> +       unsigned long flags;
>> +       struct iproc_pll_aon_pwr_ctrl aon;
>> +       struct iproc_asiu_gate asiu;
>> +       struct iproc_pll_reset_ctrl reset;
>> +       struct iproc_clk_reg_op ndiv_int;
>> +       struct iproc_clk_reg_op ndiv_frac;
>> +       struct iproc_clk_reg_op pdiv;
>> +       struct iproc_pll_vco_ctrl vco_ctrl;
>> +       struct iproc_clk_reg_op status;
>> +};
>> +
>> +/*
>> + * Controls enabling/disabling a PLL derived clock
>> + */
>> +struct iproc_clk_enable_ctrl {
>> +       unsigned int offset;
>> +       unsigned int enable_shift;
>> +       unsigned int hold_shift;
>> +       unsigned int bypass_shift;
>> +};
>> +
>> +/*
>> + * Main clock control parameters for clocks derived from the PLLs
>> + */
>> +struct iproc_clk_ctrl {
>> +       unsigned int channel;
>> +       unsigned long flags;
>> +       struct iproc_clk_enable_ctrl enable;
>> +       struct iproc_clk_reg_op mdiv;
>> +};
>> +
>> +/*
>> + * Divisor of the ASIU clocks
>> + */
>> +struct iproc_asiu_div {
>> +       unsigned int offset;
>> +       unsigned int en_shift;
>> +       unsigned int high_shift;
>> +       unsigned int high_width;
>> +       unsigned int low_shift;
>> +       unsigned int low_width;
>> +};
>> +
>> +extern void __init iproc_armpll_setup(struct device_node *node);
>> +extern void __init iproc_pll_setup(struct device_node *node,
>> +               const struct iproc_pll_ctrl *ctrl,
>> +               const struct iproc_pll_vco_freq_param *vco_param,
>> +               unsigned int num_freqs);
>> +extern void __init iproc_clk_setup(struct device_node *node,
>> +               const struct iproc_clk_ctrl *ctrl, unsigned int num_clks);
>> +extern void __init iproc_asiu_setup(struct device_node *node,
>> +               const struct iproc_asiu_div *div,
>> +               const struct iproc_asiu_gate *gate, unsigned int num_clks);
>> +
>> +#endif /* _CLK_IPROC_H */
>> --
>> 1.7.9.5
>>
>>
>> _______________________________________________
>> linux-arm-kernel mailing list
>> linux-arm-kernel at lists.infradead.org
>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Re: [PATCH 2/5] gpio: Cygnus: add GPIO driver

[Ray Jui]

On 12/5/2014 6:14 PM, Ray Jui wrote:
>>> +static struct irq_chip bcm_cygnus_gpio_irq_chip = {
>>> +    .name = "bcm-cygnus-gpio",
>>> +    .irq_ack = bcm_cygnus_gpio_irq_ack,
>>> +    .irq_mask = bcm_cygnus_gpio_irq_mask,
>>> +    .irq_unmask = bcm_cygnus_gpio_irq_unmask,
>>> +    .irq_set_type = bcm_cygnus_gpio_irq_set_type,
>>> +};
>>
>> const?
>>
>
>
> Sure, will add const to bcm_cygnus_gpio_irq_chip
>
>>> +static struct irq_domain_ops bcm_cygnus_irq_ops = {
>>> +    .map = bcm_cygnus_gpio_irq_map,
>>> +    .unmap = bcm_cygnus_gpio_irq_unmap,
>>> +    .xlate = irq_domain_xlate_twocell,
>>> +};
>>
>> const here too?
>>
>
> Yes, will make bcm_cygnus_irq_ops const.
>
Actually, I cannot make them const here. Note they are passed into other 
APIs which can potentially modifies their values internally.

drivers/gpio/gpio-bcm-cygnus.c: In function ‘bcm_cygnus_gpio_irq_map’:
drivers/gpio/gpio-bcm-cygnus.c:430:4: warning: passing argument 2 of 
‘irq_set_chip_and_handler’ discards ‘const’ qualifier from pointer 
target type [enabled by default]
     handle_simple_irq);
     ^
In file included from drivers/gpio/gpio-bcm-cygnus.c:17:0:
include/linux/irq.h:461:20: note: expected ‘struct irq_chip *’ but 
argument is of type ‘const struct irq_chip *’
  static inline void irq_set_chip_and_handler(unsigned int irq, struct 
irq_chip *chip,
                     ^
drivers/gpio/gpio-bcm-cygnus.c: In function ‘bcm_cygnus_gpio_probe’:
drivers/gpio/gpio-bcm-cygnus.c:679:5: warning: passing argument 2 of 
‘irq_set_chip_and_handler’ discards ‘const’ qualifier from pointer 
target type [enabled by default]
      handle_simple_irq);
      ^
In file included from drivers/gpio/gpio-bcm-cygnus.c:17:0:
include/linux/irq.h:461:20: note: expected ‘struct irq_chip *’ but 
argument is of type ‘const struct irq_chip *’
  static inline void irq_set_chip_and_handler(unsigned int irq, struct 
irq_chip *chip,
--
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Re: [PATCH 2/5] gpio: Cygnus: add GPIO driver

[Ray Jui]

On 12/5/2014 6:14 PM, Ray Jui wrote:
>>> +static struct irq_chip bcm_cygnus_gpio_irq_chip = {
>>> +    .name = "bcm-cygnus-gpio",
>>> +    .irq_ack = bcm_cygnus_gpio_irq_ack,
>>> +    .irq_mask = bcm_cygnus_gpio_irq_mask,
>>> +    .irq_unmask = bcm_cygnus_gpio_irq_unmask,
>>> +    .irq_set_type = bcm_cygnus_gpio_irq_set_type,
>>> +};
>>
>> const?
>>
>
>
> Sure, will add const to bcm_cygnus_gpio_irq_chip
>
>>> +static struct irq_domain_ops bcm_cygnus_irq_ops = {
>>> +    .map = bcm_cygnus_gpio_irq_map,
>>> +    .unmap = bcm_cygnus_gpio_irq_unmap,
>>> +    .xlate = irq_domain_xlate_twocell,
>>> +};
>>
>> const here too?
>>
>
> Yes, will make bcm_cygnus_irq_ops const.
>
Actually, I cannot make them const here. Note they are passed into other 
APIs which can potentially modifies their values internally.

drivers/gpio/gpio-bcm-cygnus.c: In function ‘bcm_cygnus_gpio_irq_map’:
drivers/gpio/gpio-bcm-cygnus.c:430:4: warning: passing argument 2 of 
‘irq_set_chip_and_handler’ discards ‘const’ qualifier from pointer 
target type [enabled by default]
     handle_simple_irq);
     ^
In file included from drivers/gpio/gpio-bcm-cygnus.c:17:0:
include/linux/irq.h:461:20: note: expected ‘struct irq_chip *’ but 
argument is of type ‘const struct irq_chip *’
  static inline void irq_set_chip_and_handler(unsigned int irq, struct 
irq_chip *chip,
                     ^
drivers/gpio/gpio-bcm-cygnus.c: In function ‘bcm_cygnus_gpio_probe’:
drivers/gpio/gpio-bcm-cygnus.c:679:5: warning: passing argument 2 of 
‘irq_set_chip_and_handler’ discards ‘const’ qualifier from pointer 
target type [enabled by default]
      handle_simple_irq);
      ^
In file included from drivers/gpio/gpio-bcm-cygnus.c:17:0:
include/linux/irq.h:461:20: note: expected ‘struct irq_chip *’ but 
argument is of type ‘const struct irq_chip *’
  static inline void irq_set_chip_and_handler(unsigned int irq, struct 
irq_chip *chip,

[PATCH 2/5] gpio: Cygnus: add GPIO driver

[Ray Jui]

On 12/5/2014 6:14 PM, Ray Jui wrote:
>>> +static struct irq_chip bcm_cygnus_gpio_irq_chip = {
>>> +    .name = "bcm-cygnus-gpio",
>>> +    .irq_ack = bcm_cygnus_gpio_irq_ack,
>>> +    .irq_mask = bcm_cygnus_gpio_irq_mask,
>>> +    .irq_unmask = bcm_cygnus_gpio_irq_unmask,
>>> +    .irq_set_type = bcm_cygnus_gpio_irq_set_type,
>>> +};
>>
>> const?
>>
>
>
> Sure, will add const to bcm_cygnus_gpio_irq_chip
>
>>> +static struct irq_domain_ops bcm_cygnus_irq_ops = {
>>> +    .map = bcm_cygnus_gpio_irq_map,
>>> +    .unmap = bcm_cygnus_gpio_irq_unmap,
>>> +    .xlate = irq_domain_xlate_twocell,
>>> +};
>>
>> const here too?
>>
>
> Yes, will make bcm_cygnus_irq_ops const.
>
Actually, I cannot make them const here. Note they are passed into other 
APIs which can potentially modifies their values internally.

drivers/gpio/gpio-bcm-cygnus.c: In function ?bcm_cygnus_gpio_irq_map?:
drivers/gpio/gpio-bcm-cygnus.c:430:4: warning: passing argument 2 of 
?irq_set_chip_and_handler? discards ?const? qualifier from pointer 
target type [enabled by default]
     handle_simple_irq);
     ^
In file included from drivers/gpio/gpio-bcm-cygnus.c:17:0:
include/linux/irq.h:461:20: note: expected ?struct irq_chip *? but 
argument is of type ?const struct irq_chip *?
  static inline void irq_set_chip_and_handler(unsigned int irq, struct 
irq_chip *chip,
                     ^
drivers/gpio/gpio-bcm-cygnus.c: In function ?bcm_cygnus_gpio_probe?:
drivers/gpio/gpio-bcm-cygnus.c:679:5: warning: passing argument 2 of 
?irq_set_chip_and_handler? discards ?const? qualifier from pointer 
target type [enabled by default]
      handle_simple_irq);
      ^
In file included from drivers/gpio/gpio-bcm-cygnus.c:17:0:
include/linux/irq.h:461:20: note: expected ?struct irq_chip *? but 
argument is of type ?const struct irq_chip *?
  static inline void irq_set_chip_and_handler(unsigned int irq, struct 
irq_chip *chip,

[PATCH v2 0/5] Add gpio support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial GPIO support for the Broadcom Cygnus SoC.
Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
the same Cygnus GPIO driver

Changes from v1:
 - Get rid of inline qualifier
 - Get rid of redundant check in the ISR
 - Other minor fixes to imrove code readability

Ray Jui (5):
  gpio: Cygnus: define Broadcom Cygnus GPIO binding
  gpio: Cygnus: add GPIO driver
  ARM: mach-bcm: Enable GPIO support for Cygnus
  ARM: dts: enable GPIO for Broadcom Cygnus
  MAINTAINERS: Entry for Cygnus GPIO driver

 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   85 +++
 MAINTAINERS                                        |    7 +
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   30 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/gpio/Kconfig                               |   11 +
 drivers/gpio/Makefile                              |    1 +
 drivers/gpio/gpio-bcm-cygnus.c                     |  712 ++++++++++++++++++++
 7 files changed, 847 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

-- 
1.7.9.5

[PATCH v2 0/5] Add gpio support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial GPIO support for the Broadcom Cygnus SoC.
Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
the same Cygnus GPIO driver

Changes from v1:
 - Get rid of inline qualifier
 - Get rid of redundant check in the ISR
 - Other minor fixes to imrove code readability

Ray Jui (5):
  gpio: Cygnus: define Broadcom Cygnus GPIO binding
  gpio: Cygnus: add GPIO driver
  ARM: mach-bcm: Enable GPIO support for Cygnus
  ARM: dts: enable GPIO for Broadcom Cygnus
  MAINTAINERS: Entry for Cygnus GPIO driver

 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   85 +++
 MAINTAINERS                                        |    7 +
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   30 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/gpio/Kconfig                               |   11 +
 drivers/gpio/Makefile                              |    1 +
 drivers/gpio/gpio-bcm-cygnus.c                     |  712 ++++++++++++++++++++
 7 files changed, 847 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

-- 
1.7.9.5

[PATCH v2 0/5] Add gpio support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial GPIO support for the Broadcom Cygnus SoC.
Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
the same Cygnus GPIO driver

Changes from v1:
 - Get rid of inline qualifier
 - Get rid of redundant check in the ISR
 - Other minor fixes to imrove code readability

Ray Jui (5):
  gpio: Cygnus: define Broadcom Cygnus GPIO binding
  gpio: Cygnus: add GPIO driver
  ARM: mach-bcm: Enable GPIO support for Cygnus
  ARM: dts: enable GPIO for Broadcom Cygnus
  MAINTAINERS: Entry for Cygnus GPIO driver

 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   85 +++
 MAINTAINERS                                        |    7 +
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   30 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/gpio/Kconfig                               |   11 +
 drivers/gpio/Makefile                              |    1 +
 drivers/gpio/gpio-bcm-cygnus.c                     |  712 ++++++++++++++++++++
 7 files changed, 847 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

-- 
1.7.9.5

[PATCH v2 1/5] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

Document the GPIO device tree binding for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   85 ++++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt

diff --git a/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
new file mode 100644
index 0000000..24a1513
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
@@ -0,0 +1,85 @@
+Broadcom Cygnus GPIO Controller
+
+Required properties:
+
+- compatible:
+    Currently supported Cygnus GPIO controllers include:
+    "brcm,cygnus-ccm-gpio": ChipcommonG GPIO controller
+    "brcm,cygnus-asiu-gpio": ASIU GPIO controller
+    "brcm,cygnus-crmu-gpio": CRMU GPIO controller
+
+- reg:
+    Define the base and range of the I/O address space that contain the Cygnus
+GPIO controller registers
+
+- ngpios:
+    Total number of GPIOs the controller provides
+
+- #gpio-cells:
+    Must be two. The first cell is the GPIO pin number (within the
+controller's domain) and the second cell is used for the following:
+    bit[0]: polarity (0 for normal and 1 for inverted)
+    bit[18:16]: internal pull up/down: 0 - pull up/down disabled
+                                       1 - pull up enabled
+                                       2 - pull down enabled
+    bit[22:20]: drive strength: 0 - 2 mA
+                                1 - 4 mA
+                                2 - 6 mA
+                                3 - 8 mA
+                                4 - 10 mA
+                                5 - 12 mA
+                                6 - 14 mA
+                                7 - 16 mA
+
+- gpio-controller:
+    Specifies that the node is a GPIO controller
+
+Optional properties:
+
+- interrupt-controller:
+    Specifies that the node is an interrupt controller. Not all Cygnus GPIO
+interfaces support interrupt, e.g., the CRMU GPIO controller does not have its
+interrupt routed to the main processor's GIC
+
+- interrupts:
+    The interrupt outputs from the GPIO controller.
+
+- no-interrupt:
+    Specifies that the GPIO interface does not support interrupt
+
+Example:
+	gpio_asiu: gpio@180a5000 {
+		compatible = "brcm,cygnus-asiu-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio@03024800 {
+		compatible = "brcm,cygnus-crmu-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-interrupt;
+	};
+
+	/*
+	 * Touchscreen that uses the ASIU GPIO 100, with internal pull-up
+	 * enabled
+	 */
+	tsc {
+		...
+		...
+		gpio-event = <&gpio_asiu 100 0x10000>;
+	};
+
+	/* Bluetooth that uses the CRMU GPIO 2, with polarity inverted */
+	bluetooth {
+		...
+		...
+		bcm,rfkill-bank-sel = <&gpio_crmu 2 1>
+	}
-- 
1.7.9.5

[PATCH v2 1/5] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

Document the GPIO device tree binding for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   85 ++++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt

diff --git a/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
new file mode 100644
index 0000000..24a1513
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
@@ -0,0 +1,85 @@
+Broadcom Cygnus GPIO Controller
+
+Required properties:
+
+- compatible:
+    Currently supported Cygnus GPIO controllers include:
+    "brcm,cygnus-ccm-gpio": ChipcommonG GPIO controller
+    "brcm,cygnus-asiu-gpio": ASIU GPIO controller
+    "brcm,cygnus-crmu-gpio": CRMU GPIO controller
+
+- reg:
+    Define the base and range of the I/O address space that contain the Cygnus
+GPIO controller registers
+
+- ngpios:
+    Total number of GPIOs the controller provides
+
+- #gpio-cells:
+    Must be two. The first cell is the GPIO pin number (within the
+controller's domain) and the second cell is used for the following:
+    bit[0]: polarity (0 for normal and 1 for inverted)
+    bit[18:16]: internal pull up/down: 0 - pull up/down disabled
+                                       1 - pull up enabled
+                                       2 - pull down enabled
+    bit[22:20]: drive strength: 0 - 2 mA
+                                1 - 4 mA
+                                2 - 6 mA
+                                3 - 8 mA
+                                4 - 10 mA
+                                5 - 12 mA
+                                6 - 14 mA
+                                7 - 16 mA
+
+- gpio-controller:
+    Specifies that the node is a GPIO controller
+
+Optional properties:
+
+- interrupt-controller:
+    Specifies that the node is an interrupt controller. Not all Cygnus GPIO
+interfaces support interrupt, e.g., the CRMU GPIO controller does not have its
+interrupt routed to the main processor's GIC
+
+- interrupts:
+    The interrupt outputs from the GPIO controller.
+
+- no-interrupt:
+    Specifies that the GPIO interface does not support interrupt
+
+Example:
+	gpio_asiu: gpio@180a5000 {
+		compatible = "brcm,cygnus-asiu-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio@03024800 {
+		compatible = "brcm,cygnus-crmu-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-interrupt;
+	};
+
+	/*
+	 * Touchscreen that uses the ASIU GPIO 100, with internal pull-up
+	 * enabled
+	 */
+	tsc {
+		...
+		...
+		gpio-event = <&gpio_asiu 100 0x10000>;
+	};
+
+	/* Bluetooth that uses the CRMU GPIO 2, with polarity inverted */
+	bluetooth {
+		...
+		...
+		bcm,rfkill-bank-sel = <&gpio_crmu 2 1>
+	}
-- 
1.7.9.5

[PATCH v2 1/5] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

Document the GPIO device tree binding for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   85 ++++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt

diff --git a/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
new file mode 100644
index 0000000..24a1513
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
@@ -0,0 +1,85 @@
+Broadcom Cygnus GPIO Controller
+
+Required properties:
+
+- compatible:
+    Currently supported Cygnus GPIO controllers include:
+    "brcm,cygnus-ccm-gpio": ChipcommonG GPIO controller
+    "brcm,cygnus-asiu-gpio": ASIU GPIO controller
+    "brcm,cygnus-crmu-gpio": CRMU GPIO controller
+
+- reg:
+    Define the base and range of the I/O address space that contain the Cygnus
+GPIO controller registers
+
+- ngpios:
+    Total number of GPIOs the controller provides
+
+- #gpio-cells:
+    Must be two. The first cell is the GPIO pin number (within the
+controller's domain) and the second cell is used for the following:
+    bit[0]: polarity (0 for normal and 1 for inverted)
+    bit[18:16]: internal pull up/down: 0 - pull up/down disabled
+                                       1 - pull up enabled
+                                       2 - pull down enabled
+    bit[22:20]: drive strength: 0 - 2 mA
+                                1 - 4 mA
+                                2 - 6 mA
+                                3 - 8 mA
+                                4 - 10 mA
+                                5 - 12 mA
+                                6 - 14 mA
+                                7 - 16 mA
+
+- gpio-controller:
+    Specifies that the node is a GPIO controller
+
+Optional properties:
+
+- interrupt-controller:
+    Specifies that the node is an interrupt controller. Not all Cygnus GPIO
+interfaces support interrupt, e.g., the CRMU GPIO controller does not have its
+interrupt routed to the main processor's GIC
+
+- interrupts:
+    The interrupt outputs from the GPIO controller.
+
+- no-interrupt:
+    Specifies that the GPIO interface does not support interrupt
+
+Example:
+	gpio_asiu: gpio at 180a5000 {
+		compatible = "brcm,cygnus-asiu-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio at 03024800 {
+		compatible = "brcm,cygnus-crmu-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-interrupt;
+	};
+
+	/*
+	 * Touchscreen that uses the ASIU GPIO 100, with internal pull-up
+	 * enabled
+	 */
+	tsc {
+		...
+		...
+		gpio-event = <&gpio_asiu 100 0x10000>;
+	};
+
+	/* Bluetooth that uses the CRMU GPIO 2, with polarity inverted */
+	bluetooth {
+		...
+		...
+		bcm,rfkill-bank-sel = <&gpio_crmu 2 1>
+	}
-- 
1.7.9.5

[PATCH v2 2/5] gpio: Cygnus: add GPIO driver

[Ray Jui]

This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller
("brcm,cygnus-asiu-gpio"), 2) the chipCommonG GPIO controller
("brcm,cygnus-ccm-gpio"), and 3) the ALWAYS-ON GPIO controller
("brcm,cygnus-crmu-gpio")

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/gpio/Kconfig           |   11 +
 drivers/gpio/Makefile          |    1 +
 drivers/gpio/gpio-bcm-cygnus.c |  712 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 724 insertions(+)
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 633ec21..3e3b0342 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -126,6 +126,17 @@ config GPIO_74XX_MMIO
 	    8 bits:	74244 (Input), 74273 (Output)
 	    16 bits:	741624 (Input), 7416374 (Output)
 
+config GPIO_BCM_CYGNUS
+	bool "Broadcom Cygnus GPIO support"
+	depends on ARCH_BCM_CYGNUS && OF_GPIO
+	help
+	  Say yes here to turn on GPIO support for Broadcom Cygnus SoC
+
+	  The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
+	  GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
+	  the always-ON GPIO controller (CRMU). All 3 GPIO controllers are
+	  supported by this driver
+
 config GPIO_CLPS711X
 	tristate "CLPS711X GPIO support"
 	depends on ARCH_CLPS711X || COMPILE_TEST
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 81755f1..31eb7e0 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_GPIO_ADP5520)	+= gpio-adp5520.o
 obj-$(CONFIG_GPIO_ADP5588)	+= gpio-adp5588.o
 obj-$(CONFIG_GPIO_AMD8111)	+= gpio-amd8111.o
 obj-$(CONFIG_GPIO_ARIZONA)	+= gpio-arizona.o
+obj-$(CONFIG_GPIO_BCM_CYGNUS)	+= gpio-bcm-cygnus.o
 obj-$(CONFIG_GPIO_BCM_KONA)	+= gpio-bcm-kona.o
 obj-$(CONFIG_GPIO_BT8XX)	+= gpio-bt8xx.o
 obj-$(CONFIG_GPIO_CLPS711X)	+= gpio-clps711x.o
diff --git a/drivers/gpio/gpio-bcm-cygnus.c b/drivers/gpio/gpio-bcm-cygnus.c
new file mode 100644
index 0000000..873dce2
--- /dev/null
+++ b/drivers/gpio/gpio-bcm-cygnus.c
@@ -0,0 +1,712 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/ioport.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/irqchip/chained_irq.h>
+
+#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
+#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
+#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
+#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
+#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
+#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
+#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
+#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
+#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
+#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
+#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
+#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
+
+/* drive strength control for ASIU GPIO */
+#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
+
+/* drive strength control for CCM GPIO */
+#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00
+
+#define GPIO_BANK_SIZE 0x200
+#define NGPIOS_PER_BANK 32
+#define GPIO_BIT(pin) ((pin) % NGPIOS_PER_BANK)
+#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
+
+#define GPIO_FLAG_BIT_MASK           0xffff
+#define GPIO_PULL_BIT_SHIFT          16
+#define GPIO_PULL_BIT_MASK           0x3
+
+#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
+#define GPIO_DRV_STRENGTH_BITS       3
+#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
+
+/*
+ * For GPIO internal pull up/down registers
+ */
+enum gpio_pull {
+	GPIO_PULL_NONE = 0,
+	GPIO_PULL_UP,
+	GPIO_PULL_DOWN,
+	GPIO_PULL_INVALID,
+};
+
+/*
+ * GPIO drive strength
+ */
+enum gpio_drv_strength {
+	GPIO_DRV_STRENGTH_2MA = 0,
+	GPIO_DRV_STRENGTH_4MA,
+	GPIO_DRV_STRENGTH_6MA,
+	GPIO_DRV_STRENGTH_8MA,
+	GPIO_DRV_STRENGTH_10MA,
+	GPIO_DRV_STRENGTH_12MA,
+	GPIO_DRV_STRENGTH_14MA,
+	GPIO_DRV_STRENGTH_16MA,
+	GPIO_DRV_STRENGTH_INVALID,
+};
+
+struct bcm_cygnus_gpio {
+	struct device *dev;
+	void __iomem *base;
+	void __iomem *io_ctrl;
+	spinlock_t lock;
+	struct gpio_chip gc;
+	unsigned num_banks;
+	int irq;
+	struct irq_domain *irq_domain;
+};
+
+static unsigned int gpio_base_index;
+
+static struct bcm_cygnus_gpio *to_bcm_cygnus_gpio(struct gpio_chip *gc)
+{
+	return container_of(gc, struct bcm_cygnus_gpio, gc);
+}
+
+static int bcm_cygnus_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+
+	return irq_find_mapping(cygnus_gpio->irq_domain, offset);
+}
+
+static unsigned int __gpio_reg_offset(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio)
+{
+	return GPIO_BANK(gpio) * GPIO_BANK_SIZE;
+}
+
+static unsigned int __gpio_bitpos(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio)
+{
+	return GPIO_BIT(gpio);
+}
+
+static void bcm_cygnus_gpio_irq_handler(unsigned int irq,
+		struct irq_desc *desc)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio;
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	int i, bit;
+
+	chained_irq_enter(chip, desc);
+
+	cygnus_gpio = irq_get_handler_data(irq);
+
+	/* go through the entire GPIO banks and handle all interrupts */
+	for (i = 0; i < cygnus_gpio->num_banks; i++) {
+		unsigned long val = readl(cygnus_gpio->base +
+				(i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_MSTAT_OFFSET);
+
+		for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
+			unsigned pin = NGPIOS_PER_BANK * i + bit;
+			int child_irq =
+				bcm_cygnus_gpio_to_irq(&cygnus_gpio->gc, pin);
+
+			/*
+			 * Clear the interrupt before invoking the
+			 * handler, so we do not leave any window
+			 */
+			writel(1 << bit,
+				cygnus_gpio->base + (i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_CLR_OFFSET);
+
+			generic_handle_irq(child_irq);
+		}
+	}
+
+	chained_irq_exit(chip, desc);
+}
+
+static void bcm_cygnus_gpio_irq_ack(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_CLR_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static void bcm_cygnus_gpio_irq_mask(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_MSK_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static void bcm_cygnus_gpio_irq_unmask(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_MSK_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static int bcm_cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int int_type, dual_edge, edge_lvl;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	switch (type & IRQ_TYPE_SENSE_MASK) {
+	case IRQ_TYPE_EDGE_RISING:
+		int_type = 0;
+		dual_edge = 0;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_EDGE_FALLING:
+		int_type = 0;
+		dual_edge = 0;
+		edge_lvl = 0;
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		int_type = 0;
+		dual_edge = 1;
+		edge_lvl = 0;
+		break;
+
+	case IRQ_TYPE_LEVEL_HIGH:
+		int_type = 1;
+		dual_edge = 0;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_LOW:
+		int_type = 1;
+		dual_edge = 0;
+		edge_lvl = 0;
+		break;
+
+	default:
+		dev_err(cygnus_gpio->dev, "invalid GPIO irq type 0x%x\n", type);
+		return -EINVAL;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_IN_TYPE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= int_type << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_DE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= dual_edge << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_EDGE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= edge_lvl << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	return 0;
+}
+
+static struct irq_chip bcm_cygnus_gpio_irq_chip = {
+	.name = "bcm-cygnus-gpio",
+	.irq_ack = bcm_cygnus_gpio_irq_ack,
+	.irq_mask = bcm_cygnus_gpio_irq_mask,
+	.irq_unmask = bcm_cygnus_gpio_irq_unmask,
+	.irq_set_type = bcm_cygnus_gpio_irq_set_type,
+};
+
+static int bcm_cygnus_gpio_direction_input(struct gpio_chip *gc,
+		unsigned gpio)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_OUT_EN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+
+	return 0;
+}
+
+static int bcm_cygnus_gpio_direction_output(struct gpio_chip *gc,
+		unsigned gpio, int value)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_OUT_EN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_OUT_OFFSET;
+
+	val = readl(cygnus_gpio->base + offset);
+	if (value)
+		val |= 1 << shift;
+	else
+		val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+		"gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
+		gpio, offset, shift, val);
+
+	return 0;
+}
+
+static void bcm_cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio,
+		int value)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_OUT_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	if (value)
+		val |= 1 << shift;
+	else
+		val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+		"gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
+		gpio, offset, shift, val);
+}
+
+static int bcm_cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_IN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = readl(cygnus_gpio->base + offset);
+	val = (val >> shift) & 1;
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u val:%u\n",
+			gpio, offset, shift, val);
+
+	return val;
+}
+
+static struct lock_class_key gpio_lock_class;
+
+static int bcm_cygnus_gpio_irq_map(struct irq_domain *d, unsigned int irq,
+				 irq_hw_number_t hwirq)
+{
+	int ret;
+
+	ret = irq_set_chip_data(irq, d->host_data);
+	if (ret < 0)
+		return ret;
+	irq_set_lockdep_class(irq, &gpio_lock_class);
+	irq_set_chip_and_handler(irq, &bcm_cygnus_gpio_irq_chip,
+			handle_simple_irq);
+	set_irq_flags(irq, IRQF_VALID);
+
+	return 0;
+}
+
+static void bcm_cygnus_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
+{
+	irq_set_chip_and_handler(irq, NULL, NULL);
+	irq_set_chip_data(irq, NULL);
+}
+
+static struct irq_domain_ops bcm_cygnus_irq_ops = {
+	.map = bcm_cygnus_gpio_irq_map,
+	.unmap = bcm_cygnus_gpio_irq_unmap,
+	.xlate = irq_domain_xlate_twocell,
+};
+
+#ifdef CONFIG_OF_GPIO
+static void bcm_cygnus_gpio_set_pull(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio, enum gpio_pull pull)
+{
+	unsigned int offset, shift;
+	u32 val, pullup;
+	unsigned long flags;
+
+	switch (pull) {
+	case GPIO_PULL_UP:
+		pullup = 1;
+		break;
+	case GPIO_PULL_DOWN:
+		pullup = 0;
+		break;
+	case GPIO_PULL_NONE:
+	case GPIO_PULL_INVALID:
+	default:
+		return;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	/* set pull up/down */
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_PAD_RES_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	if (pullup)
+		val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	/* enable pad */
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_RES_EN_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static void bcm_cygnus_gpio_set_strength(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio, enum gpio_drv_strength strength)
+{
+	struct device *dev = cygnus_gpio->dev;
+	void __iomem *base;
+	unsigned int i, offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	if (of_device_is_compatible(dev->of_node, "brcm,cygnus-asiu-gpio")) {
+		base = cygnus_gpio->base;
+		offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+			CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET;
+	} else if (of_device_is_compatible(dev->of_node,
+			"brcm,cygnus-ccm-gpio")) {
+		if (!cygnus_gpio->io_ctrl)
+			return;
+
+		base = cygnus_gpio->io_ctrl;
+		offset = CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET;
+	} else
+		return;
+
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
+		val = readl(base + offset);
+		val &= ~(1 << shift);
+		val |= ((strength >> i) & 0x1) << shift;
+		writel(val, base + offset);
+		offset += 4;
+	}
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static int bcm_cygnus_gpio_of_xlate(struct gpio_chip *gc,
+		const struct of_phandle_args *gpiospec, u32 *flags)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	enum gpio_pull pull;
+	enum gpio_drv_strength strength;
+
+	if (gc->of_gpio_n_cells < 2)
+		return -EINVAL;
+
+	if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
+		return -EINVAL;
+
+	if (gpiospec->args[0] >= gc->ngpio)
+		return -EINVAL;
+
+	pull = (gpiospec->args[1] >> GPIO_PULL_BIT_SHIFT) & GPIO_PULL_BIT_MASK;
+	if (WARN_ON(pull >= GPIO_PULL_INVALID))
+		return -EINVAL;
+
+	strength = (gpiospec->args[1] >> GPIO_DRV_STRENGTH_BIT_SHIFT) &
+		GPIO_DRV_STRENGTH_BIT_MASK;
+
+	if (flags)
+		*flags = gpiospec->args[1] & GPIO_FLAG_BIT_MASK;
+
+	bcm_cygnus_gpio_set_pull(cygnus_gpio, gpiospec->args[0], pull);
+	bcm_cygnus_gpio_set_strength(cygnus_gpio, gpiospec->args[0], strength);
+
+	return gpiospec->args[0];
+}
+#endif
+
+static const struct of_device_id bcm_cygnus_gpio_of_match[] = {
+	{ .compatible = "brcm,cygnus-crmu-gpio" },
+	{ .compatible = "brcm,cygnus-asiu-gpio" },
+	{ .compatible = "brcm,cygnus-ccm-gpio" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, bcm_cygnus_gpio_of_match);
+
+static int bcm_cygnus_gpio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	const struct of_device_id *match;
+	struct resource *res;
+	struct bcm_cygnus_gpio *cygnus_gpio;
+	struct gpio_chip *gc;
+	u32 i, ngpios;
+	int ret;
+
+	match = of_match_device(bcm_cygnus_gpio_of_match, dev);
+	if (!match) {
+		dev_err(&pdev->dev, "failed to find GPIO controller\n");
+		return -ENODEV;
+	}
+
+	cygnus_gpio = devm_kzalloc(dev, sizeof(*cygnus_gpio), GFP_KERNEL);
+	if (!cygnus_gpio)
+		return -ENOMEM;
+
+	cygnus_gpio->dev = dev;
+	platform_set_drvdata(pdev, cygnus_gpio);
+
+	if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
+		dev_err(&pdev->dev, "missing ngpios device tree property\n");
+		return -ENODEV;
+	}
+	cygnus_gpio->num_banks = (ngpios + NGPIOS_PER_BANK - 1) /
+		NGPIOS_PER_BANK;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "unable to get I/O resource\n");
+		return -ENODEV;
+	}
+
+	cygnus_gpio->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(cygnus_gpio->base)) {
+		dev_err(&pdev->dev, "unable to map I/O memory\n");
+		return PTR_ERR(cygnus_gpio->base);
+	}
+
+	/*
+	 * Only certain types of Cygnus GPIO interfaces have I/O control
+	 * registers
+	 */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (res) {
+		cygnus_gpio->io_ctrl = devm_ioremap_resource(dev, res);
+		if (IS_ERR(cygnus_gpio->io_ctrl)) {
+			dev_err(&pdev->dev, "unable to map I/O memory\n");
+			return PTR_ERR(cygnus_gpio->io_ctrl);
+		}
+	}
+
+	spin_lock_init(&cygnus_gpio->lock);
+
+	gc = &cygnus_gpio->gc;
+	gc->base = gpio_base_index;
+	gpio_base_index += ngpios;
+	gc->ngpio = ngpios;
+	gc->label = dev_name(dev);
+	gc->dev = dev;
+#ifdef CONFIG_OF_GPIO
+	gc->of_node = dev->of_node;
+	gc->of_gpio_n_cells = 2;
+	gc->of_xlate = bcm_cygnus_gpio_of_xlate;
+#endif
+	gc->direction_input = bcm_cygnus_gpio_direction_input;
+	gc->direction_output = bcm_cygnus_gpio_direction_output;
+	gc->set = bcm_cygnus_gpio_set;
+	gc->get = bcm_cygnus_gpio_get;
+	gc->to_irq = bcm_cygnus_gpio_to_irq;
+
+	ret = gpiochip_add(gc);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "unable to add GPIO chip\n");
+		goto err_dec_gpio_base;
+	}
+
+	/*
+	 * Some of the GPIO interfaces do not have interrupt wired to the main
+	 * processor
+	 */
+	if (of_find_property(dev->of_node, "no-interrupt", NULL))
+		return 0;
+
+	cygnus_gpio->irq_domain = irq_domain_add_linear(dev->of_node,
+			gc->ngpio, &bcm_cygnus_irq_ops, cygnus_gpio);
+	if (!cygnus_gpio->irq_domain) {
+		dev_err(&pdev->dev, "unable to allocate IRQ domain\n");
+		ret = -ENXIO;
+		goto err_rm_gpiochip;
+	}
+
+	cygnus_gpio->irq = platform_get_irq(pdev, 0);
+	if (cygnus_gpio->irq < 0) {
+		dev_err(&pdev->dev, "unable to get IRQ\n");
+		ret = cygnus_gpio->irq;
+		goto err_rm_irq_domain;
+	}
+
+	for (i = 0; i < gc->ngpio; i++) {
+		int irq = irq_create_mapping(cygnus_gpio->irq_domain, i);
+
+		irq_set_lockdep_class(irq, &gpio_lock_class);
+		irq_set_chip_data(irq, cygnus_gpio);
+		irq_set_chip_and_handler(irq, &bcm_cygnus_gpio_irq_chip,
+				handle_simple_irq);
+		set_irq_flags(irq, IRQF_VALID);
+	}
+
+	irq_set_chained_handler(cygnus_gpio->irq, bcm_cygnus_gpio_irq_handler);
+	irq_set_handler_data(cygnus_gpio->irq, cygnus_gpio);
+
+	return 0;
+
+err_rm_irq_domain:
+	irq_domain_remove(cygnus_gpio->irq_domain);
+
+err_rm_gpiochip:
+	gpiochip_remove(gc);
+
+err_dec_gpio_base:
+	gpio_base_index -= ngpios;
+	return ret;
+}
+
+static struct platform_driver bcm_cygnus_gpio_driver = {
+	.driver = {
+		.name = "bcm-cygnus-gpio",
+		.owner = THIS_MODULE,
+		.of_match_table = bcm_cygnus_gpio_of_match,
+	},
+	.probe = bcm_cygnus_gpio_probe,
+};
+
+module_platform_driver(bcm_cygnus_gpio_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus GPIO Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v2 2/5] gpio: Cygnus: add GPIO driver

[Ray Jui]

This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller
("brcm,cygnus-asiu-gpio"), 2) the chipCommonG GPIO controller
("brcm,cygnus-ccm-gpio"), and 3) the ALWAYS-ON GPIO controller
("brcm,cygnus-crmu-gpio")

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/gpio/Kconfig           |   11 +
 drivers/gpio/Makefile          |    1 +
 drivers/gpio/gpio-bcm-cygnus.c |  712 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 724 insertions(+)
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 633ec21..3e3b0342 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -126,6 +126,17 @@ config GPIO_74XX_MMIO
 	    8 bits:	74244 (Input), 74273 (Output)
 	    16 bits:	741624 (Input), 7416374 (Output)
 
+config GPIO_BCM_CYGNUS
+	bool "Broadcom Cygnus GPIO support"
+	depends on ARCH_BCM_CYGNUS && OF_GPIO
+	help
+	  Say yes here to turn on GPIO support for Broadcom Cygnus SoC
+
+	  The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
+	  GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
+	  the always-ON GPIO controller (CRMU). All 3 GPIO controllers are
+	  supported by this driver
+
 config GPIO_CLPS711X
 	tristate "CLPS711X GPIO support"
 	depends on ARCH_CLPS711X || COMPILE_TEST
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 81755f1..31eb7e0 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_GPIO_ADP5520)	+= gpio-adp5520.o
 obj-$(CONFIG_GPIO_ADP5588)	+= gpio-adp5588.o
 obj-$(CONFIG_GPIO_AMD8111)	+= gpio-amd8111.o
 obj-$(CONFIG_GPIO_ARIZONA)	+= gpio-arizona.o
+obj-$(CONFIG_GPIO_BCM_CYGNUS)	+= gpio-bcm-cygnus.o
 obj-$(CONFIG_GPIO_BCM_KONA)	+= gpio-bcm-kona.o
 obj-$(CONFIG_GPIO_BT8XX)	+= gpio-bt8xx.o
 obj-$(CONFIG_GPIO_CLPS711X)	+= gpio-clps711x.o
diff --git a/drivers/gpio/gpio-bcm-cygnus.c b/drivers/gpio/gpio-bcm-cygnus.c
new file mode 100644
index 0000000..873dce2
--- /dev/null
+++ b/drivers/gpio/gpio-bcm-cygnus.c
@@ -0,0 +1,712 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/ioport.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/irqchip/chained_irq.h>
+
+#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
+#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
+#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
+#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
+#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
+#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
+#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
+#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
+#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
+#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
+#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
+#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
+
+/* drive strength control for ASIU GPIO */
+#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
+
+/* drive strength control for CCM GPIO */
+#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00
+
+#define GPIO_BANK_SIZE 0x200
+#define NGPIOS_PER_BANK 32
+#define GPIO_BIT(pin) ((pin) % NGPIOS_PER_BANK)
+#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
+
+#define GPIO_FLAG_BIT_MASK           0xffff
+#define GPIO_PULL_BIT_SHIFT          16
+#define GPIO_PULL_BIT_MASK           0x3
+
+#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
+#define GPIO_DRV_STRENGTH_BITS       3
+#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
+
+/*
+ * For GPIO internal pull up/down registers
+ */
+enum gpio_pull {
+	GPIO_PULL_NONE = 0,
+	GPIO_PULL_UP,
+	GPIO_PULL_DOWN,
+	GPIO_PULL_INVALID,
+};
+
+/*
+ * GPIO drive strength
+ */
+enum gpio_drv_strength {
+	GPIO_DRV_STRENGTH_2MA = 0,
+	GPIO_DRV_STRENGTH_4MA,
+	GPIO_DRV_STRENGTH_6MA,
+	GPIO_DRV_STRENGTH_8MA,
+	GPIO_DRV_STRENGTH_10MA,
+	GPIO_DRV_STRENGTH_12MA,
+	GPIO_DRV_STRENGTH_14MA,
+	GPIO_DRV_STRENGTH_16MA,
+	GPIO_DRV_STRENGTH_INVALID,
+};
+
+struct bcm_cygnus_gpio {
+	struct device *dev;
+	void __iomem *base;
+	void __iomem *io_ctrl;
+	spinlock_t lock;
+	struct gpio_chip gc;
+	unsigned num_banks;
+	int irq;
+	struct irq_domain *irq_domain;
+};
+
+static unsigned int gpio_base_index;
+
+static struct bcm_cygnus_gpio *to_bcm_cygnus_gpio(struct gpio_chip *gc)
+{
+	return container_of(gc, struct bcm_cygnus_gpio, gc);
+}
+
+static int bcm_cygnus_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+
+	return irq_find_mapping(cygnus_gpio->irq_domain, offset);
+}
+
+static unsigned int __gpio_reg_offset(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio)
+{
+	return GPIO_BANK(gpio) * GPIO_BANK_SIZE;
+}
+
+static unsigned int __gpio_bitpos(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio)
+{
+	return GPIO_BIT(gpio);
+}
+
+static void bcm_cygnus_gpio_irq_handler(unsigned int irq,
+		struct irq_desc *desc)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio;
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	int i, bit;
+
+	chained_irq_enter(chip, desc);
+
+	cygnus_gpio = irq_get_handler_data(irq);
+
+	/* go through the entire GPIO banks and handle all interrupts */
+	for (i = 0; i < cygnus_gpio->num_banks; i++) {
+		unsigned long val = readl(cygnus_gpio->base +
+				(i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_MSTAT_OFFSET);
+
+		for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
+			unsigned pin = NGPIOS_PER_BANK * i + bit;
+			int child_irq =
+				bcm_cygnus_gpio_to_irq(&cygnus_gpio->gc, pin);
+
+			/*
+			 * Clear the interrupt before invoking the
+			 * handler, so we do not leave any window
+			 */
+			writel(1 << bit,
+				cygnus_gpio->base + (i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_CLR_OFFSET);
+
+			generic_handle_irq(child_irq);
+		}
+	}
+
+	chained_irq_exit(chip, desc);
+}
+
+static void bcm_cygnus_gpio_irq_ack(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_CLR_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static void bcm_cygnus_gpio_irq_mask(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_MSK_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static void bcm_cygnus_gpio_irq_unmask(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_MSK_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static int bcm_cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int int_type, dual_edge, edge_lvl;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	switch (type & IRQ_TYPE_SENSE_MASK) {
+	case IRQ_TYPE_EDGE_RISING:
+		int_type = 0;
+		dual_edge = 0;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_EDGE_FALLING:
+		int_type = 0;
+		dual_edge = 0;
+		edge_lvl = 0;
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		int_type = 0;
+		dual_edge = 1;
+		edge_lvl = 0;
+		break;
+
+	case IRQ_TYPE_LEVEL_HIGH:
+		int_type = 1;
+		dual_edge = 0;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_LOW:
+		int_type = 1;
+		dual_edge = 0;
+		edge_lvl = 0;
+		break;
+
+	default:
+		dev_err(cygnus_gpio->dev, "invalid GPIO irq type 0x%x\n", type);
+		return -EINVAL;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_IN_TYPE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= int_type << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_DE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= dual_edge << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_EDGE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= edge_lvl << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	return 0;
+}
+
+static struct irq_chip bcm_cygnus_gpio_irq_chip = {
+	.name = "bcm-cygnus-gpio",
+	.irq_ack = bcm_cygnus_gpio_irq_ack,
+	.irq_mask = bcm_cygnus_gpio_irq_mask,
+	.irq_unmask = bcm_cygnus_gpio_irq_unmask,
+	.irq_set_type = bcm_cygnus_gpio_irq_set_type,
+};
+
+static int bcm_cygnus_gpio_direction_input(struct gpio_chip *gc,
+		unsigned gpio)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_OUT_EN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+
+	return 0;
+}
+
+static int bcm_cygnus_gpio_direction_output(struct gpio_chip *gc,
+		unsigned gpio, int value)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_OUT_EN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_OUT_OFFSET;
+
+	val = readl(cygnus_gpio->base + offset);
+	if (value)
+		val |= 1 << shift;
+	else
+		val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+		"gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
+		gpio, offset, shift, val);
+
+	return 0;
+}
+
+static void bcm_cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio,
+		int value)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_OUT_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	if (value)
+		val |= 1 << shift;
+	else
+		val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+		"gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
+		gpio, offset, shift, val);
+}
+
+static int bcm_cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_IN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = readl(cygnus_gpio->base + offset);
+	val = (val >> shift) & 1;
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u val:%u\n",
+			gpio, offset, shift, val);
+
+	return val;
+}
+
+static struct lock_class_key gpio_lock_class;
+
+static int bcm_cygnus_gpio_irq_map(struct irq_domain *d, unsigned int irq,
+				 irq_hw_number_t hwirq)
+{
+	int ret;
+
+	ret = irq_set_chip_data(irq, d->host_data);
+	if (ret < 0)
+		return ret;
+	irq_set_lockdep_class(irq, &gpio_lock_class);
+	irq_set_chip_and_handler(irq, &bcm_cygnus_gpio_irq_chip,
+			handle_simple_irq);
+	set_irq_flags(irq, IRQF_VALID);
+
+	return 0;
+}
+
+static void bcm_cygnus_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
+{
+	irq_set_chip_and_handler(irq, NULL, NULL);
+	irq_set_chip_data(irq, NULL);
+}
+
+static struct irq_domain_ops bcm_cygnus_irq_ops = {
+	.map = bcm_cygnus_gpio_irq_map,
+	.unmap = bcm_cygnus_gpio_irq_unmap,
+	.xlate = irq_domain_xlate_twocell,
+};
+
+#ifdef CONFIG_OF_GPIO
+static void bcm_cygnus_gpio_set_pull(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio, enum gpio_pull pull)
+{
+	unsigned int offset, shift;
+	u32 val, pullup;
+	unsigned long flags;
+
+	switch (pull) {
+	case GPIO_PULL_UP:
+		pullup = 1;
+		break;
+	case GPIO_PULL_DOWN:
+		pullup = 0;
+		break;
+	case GPIO_PULL_NONE:
+	case GPIO_PULL_INVALID:
+	default:
+		return;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	/* set pull up/down */
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_PAD_RES_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	if (pullup)
+		val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	/* enable pad */
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_RES_EN_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static void bcm_cygnus_gpio_set_strength(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio, enum gpio_drv_strength strength)
+{
+	struct device *dev = cygnus_gpio->dev;
+	void __iomem *base;
+	unsigned int i, offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	if (of_device_is_compatible(dev->of_node, "brcm,cygnus-asiu-gpio")) {
+		base = cygnus_gpio->base;
+		offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+			CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET;
+	} else if (of_device_is_compatible(dev->of_node,
+			"brcm,cygnus-ccm-gpio")) {
+		if (!cygnus_gpio->io_ctrl)
+			return;
+
+		base = cygnus_gpio->io_ctrl;
+		offset = CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET;
+	} else
+		return;
+
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
+		val = readl(base + offset);
+		val &= ~(1 << shift);
+		val |= ((strength >> i) & 0x1) << shift;
+		writel(val, base + offset);
+		offset += 4;
+	}
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static int bcm_cygnus_gpio_of_xlate(struct gpio_chip *gc,
+		const struct of_phandle_args *gpiospec, u32 *flags)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	enum gpio_pull pull;
+	enum gpio_drv_strength strength;
+
+	if (gc->of_gpio_n_cells < 2)
+		return -EINVAL;
+
+	if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
+		return -EINVAL;
+
+	if (gpiospec->args[0] >= gc->ngpio)
+		return -EINVAL;
+
+	pull = (gpiospec->args[1] >> GPIO_PULL_BIT_SHIFT) & GPIO_PULL_BIT_MASK;
+	if (WARN_ON(pull >= GPIO_PULL_INVALID))
+		return -EINVAL;
+
+	strength = (gpiospec->args[1] >> GPIO_DRV_STRENGTH_BIT_SHIFT) &
+		GPIO_DRV_STRENGTH_BIT_MASK;
+
+	if (flags)
+		*flags = gpiospec->args[1] & GPIO_FLAG_BIT_MASK;
+
+	bcm_cygnus_gpio_set_pull(cygnus_gpio, gpiospec->args[0], pull);
+	bcm_cygnus_gpio_set_strength(cygnus_gpio, gpiospec->args[0], strength);
+
+	return gpiospec->args[0];
+}
+#endif
+
+static const struct of_device_id bcm_cygnus_gpio_of_match[] = {
+	{ .compatible = "brcm,cygnus-crmu-gpio" },
+	{ .compatible = "brcm,cygnus-asiu-gpio" },
+	{ .compatible = "brcm,cygnus-ccm-gpio" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, bcm_cygnus_gpio_of_match);
+
+static int bcm_cygnus_gpio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	const struct of_device_id *match;
+	struct resource *res;
+	struct bcm_cygnus_gpio *cygnus_gpio;
+	struct gpio_chip *gc;
+	u32 i, ngpios;
+	int ret;
+
+	match = of_match_device(bcm_cygnus_gpio_of_match, dev);
+	if (!match) {
+		dev_err(&pdev->dev, "failed to find GPIO controller\n");
+		return -ENODEV;
+	}
+
+	cygnus_gpio = devm_kzalloc(dev, sizeof(*cygnus_gpio), GFP_KERNEL);
+	if (!cygnus_gpio)
+		return -ENOMEM;
+
+	cygnus_gpio->dev = dev;
+	platform_set_drvdata(pdev, cygnus_gpio);
+
+	if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
+		dev_err(&pdev->dev, "missing ngpios device tree property\n");
+		return -ENODEV;
+	}
+	cygnus_gpio->num_banks = (ngpios + NGPIOS_PER_BANK - 1) /
+		NGPIOS_PER_BANK;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "unable to get I/O resource\n");
+		return -ENODEV;
+	}
+
+	cygnus_gpio->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(cygnus_gpio->base)) {
+		dev_err(&pdev->dev, "unable to map I/O memory\n");
+		return PTR_ERR(cygnus_gpio->base);
+	}
+
+	/*
+	 * Only certain types of Cygnus GPIO interfaces have I/O control
+	 * registers
+	 */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (res) {
+		cygnus_gpio->io_ctrl = devm_ioremap_resource(dev, res);
+		if (IS_ERR(cygnus_gpio->io_ctrl)) {
+			dev_err(&pdev->dev, "unable to map I/O memory\n");
+			return PTR_ERR(cygnus_gpio->io_ctrl);
+		}
+	}
+
+	spin_lock_init(&cygnus_gpio->lock);
+
+	gc = &cygnus_gpio->gc;
+	gc->base = gpio_base_index;
+	gpio_base_index += ngpios;
+	gc->ngpio = ngpios;
+	gc->label = dev_name(dev);
+	gc->dev = dev;
+#ifdef CONFIG_OF_GPIO
+	gc->of_node = dev->of_node;
+	gc->of_gpio_n_cells = 2;
+	gc->of_xlate = bcm_cygnus_gpio_of_xlate;
+#endif
+	gc->direction_input = bcm_cygnus_gpio_direction_input;
+	gc->direction_output = bcm_cygnus_gpio_direction_output;
+	gc->set = bcm_cygnus_gpio_set;
+	gc->get = bcm_cygnus_gpio_get;
+	gc->to_irq = bcm_cygnus_gpio_to_irq;
+
+	ret = gpiochip_add(gc);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "unable to add GPIO chip\n");
+		goto err_dec_gpio_base;
+	}
+
+	/*
+	 * Some of the GPIO interfaces do not have interrupt wired to the main
+	 * processor
+	 */
+	if (of_find_property(dev->of_node, "no-interrupt", NULL))
+		return 0;
+
+	cygnus_gpio->irq_domain = irq_domain_add_linear(dev->of_node,
+			gc->ngpio, &bcm_cygnus_irq_ops, cygnus_gpio);
+	if (!cygnus_gpio->irq_domain) {
+		dev_err(&pdev->dev, "unable to allocate IRQ domain\n");
+		ret = -ENXIO;
+		goto err_rm_gpiochip;
+	}
+
+	cygnus_gpio->irq = platform_get_irq(pdev, 0);
+	if (cygnus_gpio->irq < 0) {
+		dev_err(&pdev->dev, "unable to get IRQ\n");
+		ret = cygnus_gpio->irq;
+		goto err_rm_irq_domain;
+	}
+
+	for (i = 0; i < gc->ngpio; i++) {
+		int irq = irq_create_mapping(cygnus_gpio->irq_domain, i);
+
+		irq_set_lockdep_class(irq, &gpio_lock_class);
+		irq_set_chip_data(irq, cygnus_gpio);
+		irq_set_chip_and_handler(irq, &bcm_cygnus_gpio_irq_chip,
+				handle_simple_irq);
+		set_irq_flags(irq, IRQF_VALID);
+	}
+
+	irq_set_chained_handler(cygnus_gpio->irq, bcm_cygnus_gpio_irq_handler);
+	irq_set_handler_data(cygnus_gpio->irq, cygnus_gpio);
+
+	return 0;
+
+err_rm_irq_domain:
+	irq_domain_remove(cygnus_gpio->irq_domain);
+
+err_rm_gpiochip:
+	gpiochip_remove(gc);
+
+err_dec_gpio_base:
+	gpio_base_index -= ngpios;
+	return ret;
+}
+
+static struct platform_driver bcm_cygnus_gpio_driver = {
+	.driver = {
+		.name = "bcm-cygnus-gpio",
+		.owner = THIS_MODULE,
+		.of_match_table = bcm_cygnus_gpio_of_match,
+	},
+	.probe = bcm_cygnus_gpio_probe,
+};
+
+module_platform_driver(bcm_cygnus_gpio_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus GPIO Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v2 2/5] gpio: Cygnus: add GPIO driver

[Ray Jui]

This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller
("brcm,cygnus-asiu-gpio"), 2) the chipCommonG GPIO controller
("brcm,cygnus-ccm-gpio"), and 3) the ALWAYS-ON GPIO controller
("brcm,cygnus-crmu-gpio")

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/gpio/Kconfig           |   11 +
 drivers/gpio/Makefile          |    1 +
 drivers/gpio/gpio-bcm-cygnus.c |  712 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 724 insertions(+)
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 633ec21..3e3b0342 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -126,6 +126,17 @@ config GPIO_74XX_MMIO
 	    8 bits:	74244 (Input), 74273 (Output)
 	    16 bits:	741624 (Input), 7416374 (Output)
 
+config GPIO_BCM_CYGNUS
+	bool "Broadcom Cygnus GPIO support"
+	depends on ARCH_BCM_CYGNUS && OF_GPIO
+	help
+	  Say yes here to turn on GPIO support for Broadcom Cygnus SoC
+
+	  The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
+	  GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
+	  the always-ON GPIO controller (CRMU). All 3 GPIO controllers are
+	  supported by this driver
+
 config GPIO_CLPS711X
 	tristate "CLPS711X GPIO support"
 	depends on ARCH_CLPS711X || COMPILE_TEST
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 81755f1..31eb7e0 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_GPIO_ADP5520)	+= gpio-adp5520.o
 obj-$(CONFIG_GPIO_ADP5588)	+= gpio-adp5588.o
 obj-$(CONFIG_GPIO_AMD8111)	+= gpio-amd8111.o
 obj-$(CONFIG_GPIO_ARIZONA)	+= gpio-arizona.o
+obj-$(CONFIG_GPIO_BCM_CYGNUS)	+= gpio-bcm-cygnus.o
 obj-$(CONFIG_GPIO_BCM_KONA)	+= gpio-bcm-kona.o
 obj-$(CONFIG_GPIO_BT8XX)	+= gpio-bt8xx.o
 obj-$(CONFIG_GPIO_CLPS711X)	+= gpio-clps711x.o
diff --git a/drivers/gpio/gpio-bcm-cygnus.c b/drivers/gpio/gpio-bcm-cygnus.c
new file mode 100644
index 0000000..873dce2
--- /dev/null
+++ b/drivers/gpio/gpio-bcm-cygnus.c
@@ -0,0 +1,712 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/ioport.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/irqchip/chained_irq.h>
+
+#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
+#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
+#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
+#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
+#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
+#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
+#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
+#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
+#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
+#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
+#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
+#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
+
+/* drive strength control for ASIU GPIO */
+#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
+
+/* drive strength control for CCM GPIO */
+#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00
+
+#define GPIO_BANK_SIZE 0x200
+#define NGPIOS_PER_BANK 32
+#define GPIO_BIT(pin) ((pin) % NGPIOS_PER_BANK)
+#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
+
+#define GPIO_FLAG_BIT_MASK           0xffff
+#define GPIO_PULL_BIT_SHIFT          16
+#define GPIO_PULL_BIT_MASK           0x3
+
+#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
+#define GPIO_DRV_STRENGTH_BITS       3
+#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
+
+/*
+ * For GPIO internal pull up/down registers
+ */
+enum gpio_pull {
+	GPIO_PULL_NONE = 0,
+	GPIO_PULL_UP,
+	GPIO_PULL_DOWN,
+	GPIO_PULL_INVALID,
+};
+
+/*
+ * GPIO drive strength
+ */
+enum gpio_drv_strength {
+	GPIO_DRV_STRENGTH_2MA = 0,
+	GPIO_DRV_STRENGTH_4MA,
+	GPIO_DRV_STRENGTH_6MA,
+	GPIO_DRV_STRENGTH_8MA,
+	GPIO_DRV_STRENGTH_10MA,
+	GPIO_DRV_STRENGTH_12MA,
+	GPIO_DRV_STRENGTH_14MA,
+	GPIO_DRV_STRENGTH_16MA,
+	GPIO_DRV_STRENGTH_INVALID,
+};
+
+struct bcm_cygnus_gpio {
+	struct device *dev;
+	void __iomem *base;
+	void __iomem *io_ctrl;
+	spinlock_t lock;
+	struct gpio_chip gc;
+	unsigned num_banks;
+	int irq;
+	struct irq_domain *irq_domain;
+};
+
+static unsigned int gpio_base_index;
+
+static struct bcm_cygnus_gpio *to_bcm_cygnus_gpio(struct gpio_chip *gc)
+{
+	return container_of(gc, struct bcm_cygnus_gpio, gc);
+}
+
+static int bcm_cygnus_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+
+	return irq_find_mapping(cygnus_gpio->irq_domain, offset);
+}
+
+static unsigned int __gpio_reg_offset(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio)
+{
+	return GPIO_BANK(gpio) * GPIO_BANK_SIZE;
+}
+
+static unsigned int __gpio_bitpos(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio)
+{
+	return GPIO_BIT(gpio);
+}
+
+static void bcm_cygnus_gpio_irq_handler(unsigned int irq,
+		struct irq_desc *desc)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio;
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	int i, bit;
+
+	chained_irq_enter(chip, desc);
+
+	cygnus_gpio = irq_get_handler_data(irq);
+
+	/* go through the entire GPIO banks and handle all interrupts */
+	for (i = 0; i < cygnus_gpio->num_banks; i++) {
+		unsigned long val = readl(cygnus_gpio->base +
+				(i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_MSTAT_OFFSET);
+
+		for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
+			unsigned pin = NGPIOS_PER_BANK * i + bit;
+			int child_irq =
+				bcm_cygnus_gpio_to_irq(&cygnus_gpio->gc, pin);
+
+			/*
+			 * Clear the interrupt before invoking the
+			 * handler, so we do not leave any window
+			 */
+			writel(1 << bit,
+				cygnus_gpio->base + (i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_CLR_OFFSET);
+
+			generic_handle_irq(child_irq);
+		}
+	}
+
+	chained_irq_exit(chip, desc);
+}
+
+static void bcm_cygnus_gpio_irq_ack(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_CLR_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static void bcm_cygnus_gpio_irq_mask(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_MSK_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static void bcm_cygnus_gpio_irq_unmask(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_MSK_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static int bcm_cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int int_type, dual_edge, edge_lvl;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	switch (type & IRQ_TYPE_SENSE_MASK) {
+	case IRQ_TYPE_EDGE_RISING:
+		int_type = 0;
+		dual_edge = 0;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_EDGE_FALLING:
+		int_type = 0;
+		dual_edge = 0;
+		edge_lvl = 0;
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		int_type = 0;
+		dual_edge = 1;
+		edge_lvl = 0;
+		break;
+
+	case IRQ_TYPE_LEVEL_HIGH:
+		int_type = 1;
+		dual_edge = 0;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_LOW:
+		int_type = 1;
+		dual_edge = 0;
+		edge_lvl = 0;
+		break;
+
+	default:
+		dev_err(cygnus_gpio->dev, "invalid GPIO irq type 0x%x\n", type);
+		return -EINVAL;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_IN_TYPE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= int_type << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_DE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= dual_edge << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_EDGE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= edge_lvl << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	return 0;
+}
+
+static struct irq_chip bcm_cygnus_gpio_irq_chip = {
+	.name = "bcm-cygnus-gpio",
+	.irq_ack = bcm_cygnus_gpio_irq_ack,
+	.irq_mask = bcm_cygnus_gpio_irq_mask,
+	.irq_unmask = bcm_cygnus_gpio_irq_unmask,
+	.irq_set_type = bcm_cygnus_gpio_irq_set_type,
+};
+
+static int bcm_cygnus_gpio_direction_input(struct gpio_chip *gc,
+		unsigned gpio)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_OUT_EN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+
+	return 0;
+}
+
+static int bcm_cygnus_gpio_direction_output(struct gpio_chip *gc,
+		unsigned gpio, int value)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_OUT_EN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_OUT_OFFSET;
+
+	val = readl(cygnus_gpio->base + offset);
+	if (value)
+		val |= 1 << shift;
+	else
+		val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+		"gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
+		gpio, offset, shift, val);
+
+	return 0;
+}
+
+static void bcm_cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio,
+		int value)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_OUT_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	if (value)
+		val |= 1 << shift;
+	else
+		val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+		"gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
+		gpio, offset, shift, val);
+}
+
+static int bcm_cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_IN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = readl(cygnus_gpio->base + offset);
+	val = (val >> shift) & 1;
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u val:%u\n",
+			gpio, offset, shift, val);
+
+	return val;
+}
+
+static struct lock_class_key gpio_lock_class;
+
+static int bcm_cygnus_gpio_irq_map(struct irq_domain *d, unsigned int irq,
+				 irq_hw_number_t hwirq)
+{
+	int ret;
+
+	ret = irq_set_chip_data(irq, d->host_data);
+	if (ret < 0)
+		return ret;
+	irq_set_lockdep_class(irq, &gpio_lock_class);
+	irq_set_chip_and_handler(irq, &bcm_cygnus_gpio_irq_chip,
+			handle_simple_irq);
+	set_irq_flags(irq, IRQF_VALID);
+
+	return 0;
+}
+
+static void bcm_cygnus_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
+{
+	irq_set_chip_and_handler(irq, NULL, NULL);
+	irq_set_chip_data(irq, NULL);
+}
+
+static struct irq_domain_ops bcm_cygnus_irq_ops = {
+	.map = bcm_cygnus_gpio_irq_map,
+	.unmap = bcm_cygnus_gpio_irq_unmap,
+	.xlate = irq_domain_xlate_twocell,
+};
+
+#ifdef CONFIG_OF_GPIO
+static void bcm_cygnus_gpio_set_pull(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio, enum gpio_pull pull)
+{
+	unsigned int offset, shift;
+	u32 val, pullup;
+	unsigned long flags;
+
+	switch (pull) {
+	case GPIO_PULL_UP:
+		pullup = 1;
+		break;
+	case GPIO_PULL_DOWN:
+		pullup = 0;
+		break;
+	case GPIO_PULL_NONE:
+	case GPIO_PULL_INVALID:
+	default:
+		return;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	/* set pull up/down */
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_PAD_RES_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	if (pullup)
+		val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	/* enable pad */
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_RES_EN_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static void bcm_cygnus_gpio_set_strength(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio, enum gpio_drv_strength strength)
+{
+	struct device *dev = cygnus_gpio->dev;
+	void __iomem *base;
+	unsigned int i, offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	if (of_device_is_compatible(dev->of_node, "brcm,cygnus-asiu-gpio")) {
+		base = cygnus_gpio->base;
+		offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+			CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET;
+	} else if (of_device_is_compatible(dev->of_node,
+			"brcm,cygnus-ccm-gpio")) {
+		if (!cygnus_gpio->io_ctrl)
+			return;
+
+		base = cygnus_gpio->io_ctrl;
+		offset = CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET;
+	} else
+		return;
+
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
+		val = readl(base + offset);
+		val &= ~(1 << shift);
+		val |= ((strength >> i) & 0x1) << shift;
+		writel(val, base + offset);
+		offset += 4;
+	}
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static int bcm_cygnus_gpio_of_xlate(struct gpio_chip *gc,
+		const struct of_phandle_args *gpiospec, u32 *flags)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	enum gpio_pull pull;
+	enum gpio_drv_strength strength;
+
+	if (gc->of_gpio_n_cells < 2)
+		return -EINVAL;
+
+	if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
+		return -EINVAL;
+
+	if (gpiospec->args[0] >= gc->ngpio)
+		return -EINVAL;
+
+	pull = (gpiospec->args[1] >> GPIO_PULL_BIT_SHIFT) & GPIO_PULL_BIT_MASK;
+	if (WARN_ON(pull >= GPIO_PULL_INVALID))
+		return -EINVAL;
+
+	strength = (gpiospec->args[1] >> GPIO_DRV_STRENGTH_BIT_SHIFT) &
+		GPIO_DRV_STRENGTH_BIT_MASK;
+
+	if (flags)
+		*flags = gpiospec->args[1] & GPIO_FLAG_BIT_MASK;
+
+	bcm_cygnus_gpio_set_pull(cygnus_gpio, gpiospec->args[0], pull);
+	bcm_cygnus_gpio_set_strength(cygnus_gpio, gpiospec->args[0], strength);
+
+	return gpiospec->args[0];
+}
+#endif
+
+static const struct of_device_id bcm_cygnus_gpio_of_match[] = {
+	{ .compatible = "brcm,cygnus-crmu-gpio" },
+	{ .compatible = "brcm,cygnus-asiu-gpio" },
+	{ .compatible = "brcm,cygnus-ccm-gpio" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, bcm_cygnus_gpio_of_match);
+
+static int bcm_cygnus_gpio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	const struct of_device_id *match;
+	struct resource *res;
+	struct bcm_cygnus_gpio *cygnus_gpio;
+	struct gpio_chip *gc;
+	u32 i, ngpios;
+	int ret;
+
+	match = of_match_device(bcm_cygnus_gpio_of_match, dev);
+	if (!match) {
+		dev_err(&pdev->dev, "failed to find GPIO controller\n");
+		return -ENODEV;
+	}
+
+	cygnus_gpio = devm_kzalloc(dev, sizeof(*cygnus_gpio), GFP_KERNEL);
+	if (!cygnus_gpio)
+		return -ENOMEM;
+
+	cygnus_gpio->dev = dev;
+	platform_set_drvdata(pdev, cygnus_gpio);
+
+	if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
+		dev_err(&pdev->dev, "missing ngpios device tree property\n");
+		return -ENODEV;
+	}
+	cygnus_gpio->num_banks = (ngpios + NGPIOS_PER_BANK - 1) /
+		NGPIOS_PER_BANK;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "unable to get I/O resource\n");
+		return -ENODEV;
+	}
+
+	cygnus_gpio->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(cygnus_gpio->base)) {
+		dev_err(&pdev->dev, "unable to map I/O memory\n");
+		return PTR_ERR(cygnus_gpio->base);
+	}
+
+	/*
+	 * Only certain types of Cygnus GPIO interfaces have I/O control
+	 * registers
+	 */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (res) {
+		cygnus_gpio->io_ctrl = devm_ioremap_resource(dev, res);
+		if (IS_ERR(cygnus_gpio->io_ctrl)) {
+			dev_err(&pdev->dev, "unable to map I/O memory\n");
+			return PTR_ERR(cygnus_gpio->io_ctrl);
+		}
+	}
+
+	spin_lock_init(&cygnus_gpio->lock);
+
+	gc = &cygnus_gpio->gc;
+	gc->base = gpio_base_index;
+	gpio_base_index += ngpios;
+	gc->ngpio = ngpios;
+	gc->label = dev_name(dev);
+	gc->dev = dev;
+#ifdef CONFIG_OF_GPIO
+	gc->of_node = dev->of_node;
+	gc->of_gpio_n_cells = 2;
+	gc->of_xlate = bcm_cygnus_gpio_of_xlate;
+#endif
+	gc->direction_input = bcm_cygnus_gpio_direction_input;
+	gc->direction_output = bcm_cygnus_gpio_direction_output;
+	gc->set = bcm_cygnus_gpio_set;
+	gc->get = bcm_cygnus_gpio_get;
+	gc->to_irq = bcm_cygnus_gpio_to_irq;
+
+	ret = gpiochip_add(gc);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "unable to add GPIO chip\n");
+		goto err_dec_gpio_base;
+	}
+
+	/*
+	 * Some of the GPIO interfaces do not have interrupt wired to the main
+	 * processor
+	 */
+	if (of_find_property(dev->of_node, "no-interrupt", NULL))
+		return 0;
+
+	cygnus_gpio->irq_domain = irq_domain_add_linear(dev->of_node,
+			gc->ngpio, &bcm_cygnus_irq_ops, cygnus_gpio);
+	if (!cygnus_gpio->irq_domain) {
+		dev_err(&pdev->dev, "unable to allocate IRQ domain\n");
+		ret = -ENXIO;
+		goto err_rm_gpiochip;
+	}
+
+	cygnus_gpio->irq = platform_get_irq(pdev, 0);
+	if (cygnus_gpio->irq < 0) {
+		dev_err(&pdev->dev, "unable to get IRQ\n");
+		ret = cygnus_gpio->irq;
+		goto err_rm_irq_domain;
+	}
+
+	for (i = 0; i < gc->ngpio; i++) {
+		int irq = irq_create_mapping(cygnus_gpio->irq_domain, i);
+
+		irq_set_lockdep_class(irq, &gpio_lock_class);
+		irq_set_chip_data(irq, cygnus_gpio);
+		irq_set_chip_and_handler(irq, &bcm_cygnus_gpio_irq_chip,
+				handle_simple_irq);
+		set_irq_flags(irq, IRQF_VALID);
+	}
+
+	irq_set_chained_handler(cygnus_gpio->irq, bcm_cygnus_gpio_irq_handler);
+	irq_set_handler_data(cygnus_gpio->irq, cygnus_gpio);
+
+	return 0;
+
+err_rm_irq_domain:
+	irq_domain_remove(cygnus_gpio->irq_domain);
+
+err_rm_gpiochip:
+	gpiochip_remove(gc);
+
+err_dec_gpio_base:
+	gpio_base_index -= ngpios;
+	return ret;
+}
+
+static struct platform_driver bcm_cygnus_gpio_driver = {
+	.driver = {
+		.name = "bcm-cygnus-gpio",
+		.owner = THIS_MODULE,
+		.of_match_table = bcm_cygnus_gpio_of_match,
+	},
+	.probe = bcm_cygnus_gpio_probe,
+};
+
+module_platform_driver(bcm_cygnus_gpio_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus GPIO Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v2 3/5] ARM: mach-bcm: Enable GPIO support for Cygnus

[Ray Jui]

Enable GPIO driver for Broadcom Cygnus SoC by selecting GPIO_BCM_CYGNUS

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/mach-bcm/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index aaeec78..5066d5d 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -29,6 +29,7 @@ config ARCH_BCM_IPROC
 config ARCH_BCM_CYGNUS
 	bool "Broadcom Cygnus Support" if ARCH_MULTI_V7
 	select ARCH_BCM_IPROC
+	select GPIO_BCM_CYGNUS
 	help
 	  Enable support for the Cygnus family,
 	  which includes the following variants:
-- 
1.7.9.5

[PATCH v2 3/5] ARM: mach-bcm: Enable GPIO support for Cygnus

[Ray Jui]

Enable GPIO driver for Broadcom Cygnus SoC by selecting GPIO_BCM_CYGNUS

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/mach-bcm/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index aaeec78..5066d5d 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -29,6 +29,7 @@ config ARCH_BCM_IPROC
 config ARCH_BCM_CYGNUS
 	bool "Broadcom Cygnus Support" if ARCH_MULTI_V7
 	select ARCH_BCM_IPROC
+	select GPIO_BCM_CYGNUS
 	help
 	  Enable support for the Cygnus family,
 	  which includes the following variants:
-- 
1.7.9.5

[PATCH v2 3/5] ARM: mach-bcm: Enable GPIO support for Cygnus

[Ray Jui]

Enable GPIO driver for Broadcom Cygnus SoC by selecting GPIO_BCM_CYGNUS

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/mach-bcm/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index aaeec78..5066d5d 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -29,6 +29,7 @@ config ARCH_BCM_IPROC
 config ARCH_BCM_CYGNUS
 	bool "Broadcom Cygnus Support" if ARCH_MULTI_V7
 	select ARCH_BCM_IPROC
+	select GPIO_BCM_CYGNUS
 	help
 	  Enable support for the Cygnus family,
 	  which includes the following variants:
-- 
1.7.9.5

[PATCH v2 4/5] ARM: dts: enable GPIO for Broadcom Cygnus

[Ray Jui]

This enables all 3 GPIO controllers including the ASIU GPIO, the
chipcommonG GPIO, and the ALWAYS-ON GPIO, for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..c7587c1 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -54,6 +54,36 @@
 
 	/include/ "bcm-cygnus-clock.dtsi"
 
+	gpio_ccm: gpio@1800a000 {
+		compatible = "brcm,cygnus-ccm-gpio";
+		reg = <0x1800a000 0x50>,
+			<0x0301d164 0x20>;
+		ngpios = <24>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+	};
+
+	gpio_asiu: gpio@180a5000 {
+		compatible = "brcm,cygnus-asiu-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio@03024800 {
+		compatible = "brcm,cygnus-crmu-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-interrupt;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

[PATCH v2 4/5] ARM: dts: enable GPIO for Broadcom Cygnus

[Ray Jui]

This enables all 3 GPIO controllers including the ASIU GPIO, the
chipcommonG GPIO, and the ALWAYS-ON GPIO, for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..c7587c1 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -54,6 +54,36 @@
 
 	/include/ "bcm-cygnus-clock.dtsi"
 
+	gpio_ccm: gpio@1800a000 {
+		compatible = "brcm,cygnus-ccm-gpio";
+		reg = <0x1800a000 0x50>,
+			<0x0301d164 0x20>;
+		ngpios = <24>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+	};
+
+	gpio_asiu: gpio@180a5000 {
+		compatible = "brcm,cygnus-asiu-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio@03024800 {
+		compatible = "brcm,cygnus-crmu-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-interrupt;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

[PATCH v2 4/5] ARM: dts: enable GPIO for Broadcom Cygnus

[Ray Jui]

This enables all 3 GPIO controllers including the ASIU GPIO, the
chipcommonG GPIO, and the ALWAYS-ON GPIO, for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..c7587c1 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -54,6 +54,36 @@
 
 	/include/ "bcm-cygnus-clock.dtsi"
 
+	gpio_ccm: gpio at 1800a000 {
+		compatible = "brcm,cygnus-ccm-gpio";
+		reg = <0x1800a000 0x50>,
+			<0x0301d164 0x20>;
+		ngpios = <24>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+	};
+
+	gpio_asiu: gpio at 180a5000 {
+		compatible = "brcm,cygnus-asiu-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio at 03024800 {
+		compatible = "brcm,cygnus-crmu-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-interrupt;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

[PATCH v2 5/5] MAINTAINERS: Entry for Cygnus GPIO driver

[Ray Jui]

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 MAINTAINERS |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index e6bff3a..8473422 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2202,6 +2202,13 @@ N:	bcm9583*
 N:	bcm583*
 N:	bcm113*
 
+BROADCOM CYGNUS GPIO DRIVER
+M:	Ray Jui <rjui@broadcom.com>
+L:	bcm-kernel-feedback-list@broadcom.com
+S:	Supported
+F:	drivers/gpio/gpio-bcm-cygnus.c
+F:	Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
+
 BROADCOM KONA GPIO DRIVER
 M:	Ray Jui <rjui@broadcom.com>
 L:	bcm-kernel-feedback-list@broadcom.com
-- 
1.7.9.5

[PATCH v2 5/5] MAINTAINERS: Entry for Cygnus GPIO driver

[Ray Jui]

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 MAINTAINERS |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index e6bff3a..8473422 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2202,6 +2202,13 @@ N:	bcm9583*
 N:	bcm583*
 N:	bcm113*
 
+BROADCOM CYGNUS GPIO DRIVER
+M:	Ray Jui <rjui@broadcom.com>
+L:	bcm-kernel-feedback-list@broadcom.com
+S:	Supported
+F:	drivers/gpio/gpio-bcm-cygnus.c
+F:	Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
+
 BROADCOM KONA GPIO DRIVER
 M:	Ray Jui <rjui@broadcom.com>
 L:	bcm-kernel-feedback-list@broadcom.com
-- 
1.7.9.5

[PATCH v2 5/5] MAINTAINERS: Entry for Cygnus GPIO driver

[Ray Jui]

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 MAINTAINERS |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index e6bff3a..8473422 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2202,6 +2202,13 @@ N:	bcm9583*
 N:	bcm583*
 N:	bcm113*
 
+BROADCOM CYGNUS GPIO DRIVER
+M:	Ray Jui <rjui@broadcom.com>
+L:	bcm-kernel-feedback-list at broadcom.com
+S:	Supported
+F:	drivers/gpio/gpio-bcm-cygnus.c
+F:	Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
+
 BROADCOM KONA GPIO DRIVER
 M:	Ray Jui <rjui@broadcom.com>
 L:	bcm-kernel-feedback-list at broadcom.com
-- 
1.7.9.5

Re: [PATCH v2 1/5] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Arnd Bergmann]

On Sunday 07 December 2014 18:38:32 Ray Jui wrote:
> +Required properties:
> +
> +- compatible:
> +    Currently supported Cygnus GPIO controllers include:
> +    "brcm,cygnus-ccm-gpio": ChipcommonG GPIO controller
> +    "brcm,cygnus-asiu-gpio": ASIU GPIO controller
> +    "brcm,cygnus-crmu-gpio": CRMU GPIO controller

How different are these? If they are almost the same, would it
be better to use the same compatible string for all of them and
describe the differences in extra properties?

If they are rather different, maybe you should have a separate
binding and driver for each?

	Arnd

[PATCH v2 1/5] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Arnd Bergmann]

On Sunday 07 December 2014 18:38:32 Ray Jui wrote:
> +Required properties:
> +
> +- compatible:
> +    Currently supported Cygnus GPIO controllers include:
> +    "brcm,cygnus-ccm-gpio": ChipcommonG GPIO controller
> +    "brcm,cygnus-asiu-gpio": ASIU GPIO controller
> +    "brcm,cygnus-crmu-gpio": CRMU GPIO controller

How different are these? If they are almost the same, would it
be better to use the same compatible string for all of them and
describe the differences in extra properties?

If they are rather different, maybe you should have a separate
binding and driver for each?

	Arnd

Re: [PATCH v2 1/5] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

On 12/8/2014 3:22 AM, Arnd Bergmann wrote:
> On Sunday 07 December 2014 18:38:32 Ray Jui wrote:
>> +Required properties:
>> +
>> +- compatible:
>> +    Currently supported Cygnus GPIO controllers include:
>> +    "brcm,cygnus-ccm-gpio": ChipcommonG GPIO controller
>> +    "brcm,cygnus-asiu-gpio": ASIU GPIO controller
>> +    "brcm,cygnus-crmu-gpio": CRMU GPIO controller
>
> How different are these? If they are almost the same, would it
> be better to use the same compatible string for all of them and
> describe the differences in extra properties?
>
> If they are rather different, maybe you should have a separate
> binding and driver for each?
>
> 	Arnd
>
They are quite similar with the following minor differences:
1) ChipcommonG GPIO controller uses a separate register block 
(0x0301d164) to control drive stregnth
2) Cannot control drive strength for the CMRU GPIO
3) CRMU GPIO controller's interrupt is not connected to GIC of A9. 
Currently that's taken care of by using a "no-interrupt" device tree 
property

I can change to use the common compatible string "brcm,cygnus-gpio". 
With an introduction of property "no-drv-stregnth" which should be set 
for CRMU GPIO controller. For ChipcommonG GPIO, it will have a second 
register block defined, so we'll know to use that second register block 
for drive strength configuration. For the rest, we assume normal drive 
strength configuration (i.e., ASIU in our case).

Looking at this again, it looks like the "no-interrupt" property is 
really redundant. For GPIO controller without interrupt connected to A9, 
we can simply leave its interrupt properties not defined. I'll get rid 
of it along with the above changes.
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Re: [PATCH v2 1/5] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

On 12/8/2014 3:22 AM, Arnd Bergmann wrote:
> On Sunday 07 December 2014 18:38:32 Ray Jui wrote:
>> +Required properties:
>> +
>> +- compatible:
>> +    Currently supported Cygnus GPIO controllers include:
>> +    "brcm,cygnus-ccm-gpio": ChipcommonG GPIO controller
>> +    "brcm,cygnus-asiu-gpio": ASIU GPIO controller
>> +    "brcm,cygnus-crmu-gpio": CRMU GPIO controller
>
> How different are these? If they are almost the same, would it
> be better to use the same compatible string for all of them and
> describe the differences in extra properties?
>
> If they are rather different, maybe you should have a separate
> binding and driver for each?
>
> 	Arnd
>
They are quite similar with the following minor differences:
1) ChipcommonG GPIO controller uses a separate register block 
(0x0301d164) to control drive stregnth
2) Cannot control drive strength for the CMRU GPIO
3) CRMU GPIO controller's interrupt is not connected to GIC of A9. 
Currently that's taken care of by using a "no-interrupt" device tree 
property

I can change to use the common compatible string "brcm,cygnus-gpio". 
With an introduction of property "no-drv-stregnth" which should be set 
for CRMU GPIO controller. For ChipcommonG GPIO, it will have a second 
register block defined, so we'll know to use that second register block 
for drive strength configuration. For the rest, we assume normal drive 
strength configuration (i.e., ASIU in our case).

Looking at this again, it looks like the "no-interrupt" property is 
really redundant. For GPIO controller without interrupt connected to A9, 
we can simply leave its interrupt properties not defined. I'll get rid 
of it along with the above changes.

[PATCH v2 1/5] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

On 12/8/2014 3:22 AM, Arnd Bergmann wrote:
> On Sunday 07 December 2014 18:38:32 Ray Jui wrote:
>> +Required properties:
>> +
>> +- compatible:
>> +    Currently supported Cygnus GPIO controllers include:
>> +    "brcm,cygnus-ccm-gpio": ChipcommonG GPIO controller
>> +    "brcm,cygnus-asiu-gpio": ASIU GPIO controller
>> +    "brcm,cygnus-crmu-gpio": CRMU GPIO controller
>
> How different are these? If they are almost the same, would it
> be better to use the same compatible string for all of them and
> describe the differences in extra properties?
>
> If they are rather different, maybe you should have a separate
> binding and driver for each?
>
> 	Arnd
>
They are quite similar with the following minor differences:
1) ChipcommonG GPIO controller uses a separate register block 
(0x0301d164) to control drive stregnth
2) Cannot control drive strength for the CMRU GPIO
3) CRMU GPIO controller's interrupt is not connected to GIC of A9. 
Currently that's taken care of by using a "no-interrupt" device tree 
property

I can change to use the common compatible string "brcm,cygnus-gpio". 
With an introduction of property "no-drv-stregnth" which should be set 
for CRMU GPIO controller. For ChipcommonG GPIO, it will have a second 
register block defined, so we'll know to use that second register block 
for drive strength configuration. For the rest, we assume normal drive 
strength configuration (i.e., ASIU in our case).

Looking at this again, it looks like the "no-interrupt" property is 
really redundant. For GPIO controller without interrupt connected to A9, 
we can simply leave its interrupt properties not defined. I'll get rid 
of it along with the above changes.

Re: [PATCH v2 1/5] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Arnd Bergmann]

On Monday 08 December 2014 08:55:20 Ray Jui wrote:
> 
> On 12/8/2014 3:22 AM, Arnd Bergmann wrote:
> > On Sunday 07 December 2014 18:38:32 Ray Jui wrote:
> >> +Required properties:
> >> +
> >> +- compatible:
> >> +    Currently supported Cygnus GPIO controllers include:
> >> +    "brcm,cygnus-ccm-gpio": ChipcommonG GPIO controller
> >> +    "brcm,cygnus-asiu-gpio": ASIU GPIO controller
> >> +    "brcm,cygnus-crmu-gpio": CRMU GPIO controller
> >
> > How different are these? If they are almost the same, would it
> > be better to use the same compatible string for all of them and
> > describe the differences in extra properties?
> >
> > If they are rather different, maybe you should have a separate
> > binding and driver for each?
> >
> > 	Arnd
> >
> They are quite similar with the following minor differences:
> 1) ChipcommonG GPIO controller uses a separate register block 
> (0x0301d164) to control drive stregnth
> 2) Cannot control drive strength for the CMRU GPIO

This can be deducted from having one or two register blocks I
assume.

> 3) CRMU GPIO controller's interrupt is not connected to GIC of A9. 
> Currently that's taken care of by using a "no-interrupt" device tree 
> property

No need for this property even, just see if there is an "interrupts"
property or not.
 
> I can change to use the common compatible string "brcm,cygnus-gpio". 
> With an introduction of property "no-drv-stregnth" which should be set 
> for CRMU GPIO controller. 

Ok.

> For ChipcommonG GPIO, it will have a second 
> register block defined, so we'll know to use that second register block 
> for drive strength configuration. For the rest, we assume normal drive 
> strength configuration (i.e., ASIU in our case).

Maybe see if something older than cygnus was already using a compatible
gpio controller and then use the name of that.

> Looking at this again, it looks like the "no-interrupt" property is 
> really redundant. For GPIO controller without interrupt connected to A9, 
> we can simply leave its interrupt properties not defined. I'll get rid 
> of it along with the above changes.

Right.

	Arnd

[PATCH v2 1/5] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Arnd Bergmann]

On Monday 08 December 2014 08:55:20 Ray Jui wrote:
> 
> On 12/8/2014 3:22 AM, Arnd Bergmann wrote:
> > On Sunday 07 December 2014 18:38:32 Ray Jui wrote:
> >> +Required properties:
> >> +
> >> +- compatible:
> >> +    Currently supported Cygnus GPIO controllers include:
> >> +    "brcm,cygnus-ccm-gpio": ChipcommonG GPIO controller
> >> +    "brcm,cygnus-asiu-gpio": ASIU GPIO controller
> >> +    "brcm,cygnus-crmu-gpio": CRMU GPIO controller
> >
> > How different are these? If they are almost the same, would it
> > be better to use the same compatible string for all of them and
> > describe the differences in extra properties?
> >
> > If they are rather different, maybe you should have a separate
> > binding and driver for each?
> >
> > 	Arnd
> >
> They are quite similar with the following minor differences:
> 1) ChipcommonG GPIO controller uses a separate register block 
> (0x0301d164) to control drive stregnth
> 2) Cannot control drive strength for the CMRU GPIO

This can be deducted from having one or two register blocks I
assume.

> 3) CRMU GPIO controller's interrupt is not connected to GIC of A9. 
> Currently that's taken care of by using a "no-interrupt" device tree 
> property

No need for this property even, just see if there is an "interrupts"
property or not.
 
> I can change to use the common compatible string "brcm,cygnus-gpio". 
> With an introduction of property "no-drv-stregnth" which should be set 
> for CRMU GPIO controller. 

Ok.

> For ChipcommonG GPIO, it will have a second 
> register block defined, so we'll know to use that second register block 
> for drive strength configuration. For the rest, we assume normal drive 
> strength configuration (i.e., ASIU in our case).

Maybe see if something older than cygnus was already using a compatible
gpio controller and then use the name of that.

> Looking at this again, it looks like the "no-interrupt" property is 
> really redundant. For GPIO controller without interrupt connected to A9, 
> we can simply leave its interrupt properties not defined. I'll get rid 
> of it along with the above changes.

Right.

	Arnd

[PATCH v3 0/5] Add gpio support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial GPIO support for the Broadcom Cygnus SoC.
Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
the same Cygnus GPIO driver

Changes from v2:
 - Consolidate different compatible IDs into "brcm,cygnus-gpio"
 - Get rid of redundant "no-interrupt" property

Changes from v1:
 - Get rid of inline qualifier
 - Get rid of redundant check in the ISR
 - Other minor fixes to imrove code readability

Ray Jui (5):
  gpio: Cygnus: define Broadcom Cygnus GPIO binding
  gpio: Cygnus: add GPIO driver
  ARM: mach-bcm: Enable GPIO support for Cygnus
  ARM: dts: enable GPIO for Broadcom Cygnus
  MAINTAINERS: Entry for Cygnus GPIO driver

 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   82 +++
 MAINTAINERS                                        |    7 +
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   30 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/gpio/Kconfig                               |   11 +
 drivers/gpio/Makefile                              |    1 +
 drivers/gpio/gpio-bcm-cygnus.c                     |  705 ++++++++++++++++++++
 7 files changed, 837 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

-- 
1.7.9.5

[PATCH v3 0/5] Add gpio support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial GPIO support for the Broadcom Cygnus SoC.
Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
the same Cygnus GPIO driver

Changes from v2:
 - Consolidate different compatible IDs into "brcm,cygnus-gpio"
 - Get rid of redundant "no-interrupt" property

Changes from v1:
 - Get rid of inline qualifier
 - Get rid of redundant check in the ISR
 - Other minor fixes to imrove code readability

Ray Jui (5):
  gpio: Cygnus: define Broadcom Cygnus GPIO binding
  gpio: Cygnus: add GPIO driver
  ARM: mach-bcm: Enable GPIO support for Cygnus
  ARM: dts: enable GPIO for Broadcom Cygnus
  MAINTAINERS: Entry for Cygnus GPIO driver

 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   82 +++
 MAINTAINERS                                        |    7 +
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   30 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/gpio/Kconfig                               |   11 +
 drivers/gpio/Makefile                              |    1 +
 drivers/gpio/gpio-bcm-cygnus.c                     |  705 ++++++++++++++++++++
 7 files changed, 837 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

-- 
1.7.9.5

[PATCH v3 0/5] Add gpio support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial GPIO support for the Broadcom Cygnus SoC.
Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
the same Cygnus GPIO driver

Changes from v2:
 - Consolidate different compatible IDs into "brcm,cygnus-gpio"
 - Get rid of redundant "no-interrupt" property

Changes from v1:
 - Get rid of inline qualifier
 - Get rid of redundant check in the ISR
 - Other minor fixes to imrove code readability

Ray Jui (5):
  gpio: Cygnus: define Broadcom Cygnus GPIO binding
  gpio: Cygnus: add GPIO driver
  ARM: mach-bcm: Enable GPIO support for Cygnus
  ARM: dts: enable GPIO for Broadcom Cygnus
  MAINTAINERS: Entry for Cygnus GPIO driver

 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   82 +++
 MAINTAINERS                                        |    7 +
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   30 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/gpio/Kconfig                               |   11 +
 drivers/gpio/Makefile                              |    1 +
 drivers/gpio/gpio-bcm-cygnus.c                     |  705 ++++++++++++++++++++
 7 files changed, 837 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

-- 
1.7.9.5

[PATCH v2 0/5] Add gpio support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial GPIO support for the Broadcom Cygnus SoC.
Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
the same Cygnus GPIO driver

Changes from v1:
 - Get rid of inline qualifier
 - Get rid of redundant check in the ISR
 - Other minor fixes to imrove code readability

Ray Jui (5):
  gpio: Cygnus: define Broadcom Cygnus GPIO binding
  gpio: Cygnus: add GPIO driver
  ARM: mach-bcm: Enable GPIO support for Cygnus
  ARM: dts: enable GPIO for Broadcom Cygnus
  MAINTAINERS: Entry for Cygnus GPIO driver

 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   85 +++
 MAINTAINERS                                        |    7 +
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   30 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/gpio/Kconfig                               |   11 +
 drivers/gpio/Makefile                              |    1 +
 drivers/gpio/gpio-bcm-cygnus.c                     |  712 ++++++++++++++++++++
 7 files changed, 847 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

-- 
1.7.9.5

[PATCH v2 0/5] Add gpio support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial GPIO support for the Broadcom Cygnus SoC.
Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
the same Cygnus GPIO driver

Changes from v1:
 - Get rid of inline qualifier
 - Get rid of redundant check in the ISR
 - Other minor fixes to imrove code readability

Ray Jui (5):
  gpio: Cygnus: define Broadcom Cygnus GPIO binding
  gpio: Cygnus: add GPIO driver
  ARM: mach-bcm: Enable GPIO support for Cygnus
  ARM: dts: enable GPIO for Broadcom Cygnus
  MAINTAINERS: Entry for Cygnus GPIO driver

 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   85 +++
 MAINTAINERS                                        |    7 +
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   30 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/gpio/Kconfig                               |   11 +
 drivers/gpio/Makefile                              |    1 +
 drivers/gpio/gpio-bcm-cygnus.c                     |  712 ++++++++++++++++++++
 7 files changed, 847 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

-- 
1.7.9.5

[PATCH v2 0/5] Add gpio support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial GPIO support for the Broadcom Cygnus SoC.
Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
the same Cygnus GPIO driver

Changes from v1:
 - Get rid of inline qualifier
 - Get rid of redundant check in the ISR
 - Other minor fixes to imrove code readability

Ray Jui (5):
  gpio: Cygnus: define Broadcom Cygnus GPIO binding
  gpio: Cygnus: add GPIO driver
  ARM: mach-bcm: Enable GPIO support for Cygnus
  ARM: dts: enable GPIO for Broadcom Cygnus
  MAINTAINERS: Entry for Cygnus GPIO driver

 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   85 +++
 MAINTAINERS                                        |    7 +
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   30 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/gpio/Kconfig                               |   11 +
 drivers/gpio/Makefile                              |    1 +
 drivers/gpio/gpio-bcm-cygnus.c                     |  712 ++++++++++++++++++++
 7 files changed, 847 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

-- 
1.7.9.5

[PATCH v3 1/5] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

Document the GPIO device tree binding for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   82 ++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt

diff --git a/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
new file mode 100644
index 0000000..c477271
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
@@ -0,0 +1,82 @@
+Broadcom Cygnus GPIO Controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,cygnus-gpio"
+
+- reg:
+    Define the base and range of the I/O address space that contain the Cygnus
+GPIO controller registers
+
+- ngpios:
+    Total number of GPIOs the controller provides
+
+- #gpio-cells:
+    Must be two. The first cell is the GPIO pin number (within the
+controller's domain) and the second cell is used for the following:
+    bit[0]: polarity (0 for normal and 1 for inverted)
+    bit[18:16]: internal pull up/down: 0 - pull up/down disabled
+                                       1 - pull up enabled
+                                       2 - pull down enabled
+    bit[22:20]: drive strength: 0 - 2 mA
+                                1 - 4 mA
+                                2 - 6 mA
+                                3 - 8 mA
+                                4 - 10 mA
+                                5 - 12 mA
+                                6 - 14 mA
+                                7 - 16 mA
+
+- gpio-controller:
+    Specifies that the node is a GPIO controller
+
+Optional properties:
+
+- interrupt-controller:
+    Specifies that the node is an interrupt controller. Not all Cygnus GPIO
+interfaces support interrupt, e.g., the CRMU GPIO controller does not have its
+interrupt routed to the main processor's GIC
+
+- interrupts:
+    The interrupt outputs from the GPIO controller.
+
+- no-drv-stregnth:
+    Specifies the GPIO controller does not support drive strength configuration
+
+Example:
+	gpio_asiu: gpio@180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio@03024800 {
+		compatible = "brcm,cygnus-crmu-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-drv-stregnth;
+	};
+
+	/*
+	 * Touchscreen that uses the ASIU GPIO 100, with internal pull-up
+	 * enabled
+	 */
+	tsc {
+		...
+		...
+		gpio-event = <&gpio_asiu 100 0x10000>;
+	};
+
+	/* Bluetooth that uses the CRMU GPIO 2, with polarity inverted */
+	bluetooth {
+		...
+		...
+		bcm,rfkill-bank-sel = <&gpio_crmu 2 1>
+	}
-- 
1.7.9.5

[PATCH v3 1/5] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

Document the GPIO device tree binding for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   82 ++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt

diff --git a/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
new file mode 100644
index 0000000..c477271
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
@@ -0,0 +1,82 @@
+Broadcom Cygnus GPIO Controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,cygnus-gpio"
+
+- reg:
+    Define the base and range of the I/O address space that contain the Cygnus
+GPIO controller registers
+
+- ngpios:
+    Total number of GPIOs the controller provides
+
+- #gpio-cells:
+    Must be two. The first cell is the GPIO pin number (within the
+controller's domain) and the second cell is used for the following:
+    bit[0]: polarity (0 for normal and 1 for inverted)
+    bit[18:16]: internal pull up/down: 0 - pull up/down disabled
+                                       1 - pull up enabled
+                                       2 - pull down enabled
+    bit[22:20]: drive strength: 0 - 2 mA
+                                1 - 4 mA
+                                2 - 6 mA
+                                3 - 8 mA
+                                4 - 10 mA
+                                5 - 12 mA
+                                6 - 14 mA
+                                7 - 16 mA
+
+- gpio-controller:
+    Specifies that the node is a GPIO controller
+
+Optional properties:
+
+- interrupt-controller:
+    Specifies that the node is an interrupt controller. Not all Cygnus GPIO
+interfaces support interrupt, e.g., the CRMU GPIO controller does not have its
+interrupt routed to the main processor's GIC
+
+- interrupts:
+    The interrupt outputs from the GPIO controller.
+
+- no-drv-stregnth:
+    Specifies the GPIO controller does not support drive strength configuration
+
+Example:
+	gpio_asiu: gpio@180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio@03024800 {
+		compatible = "brcm,cygnus-crmu-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-drv-stregnth;
+	};
+
+	/*
+	 * Touchscreen that uses the ASIU GPIO 100, with internal pull-up
+	 * enabled
+	 */
+	tsc {
+		...
+		...
+		gpio-event = <&gpio_asiu 100 0x10000>;
+	};
+
+	/* Bluetooth that uses the CRMU GPIO 2, with polarity inverted */
+	bluetooth {
+		...
+		...
+		bcm,rfkill-bank-sel = <&gpio_crmu 2 1>
+	}
-- 
1.7.9.5

[PATCH v3 1/5] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

Document the GPIO device tree binding for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   82 ++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt

diff --git a/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
new file mode 100644
index 0000000..c477271
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
@@ -0,0 +1,82 @@
+Broadcom Cygnus GPIO Controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,cygnus-gpio"
+
+- reg:
+    Define the base and range of the I/O address space that contain the Cygnus
+GPIO controller registers
+
+- ngpios:
+    Total number of GPIOs the controller provides
+
+- #gpio-cells:
+    Must be two. The first cell is the GPIO pin number (within the
+controller's domain) and the second cell is used for the following:
+    bit[0]: polarity (0 for normal and 1 for inverted)
+    bit[18:16]: internal pull up/down: 0 - pull up/down disabled
+                                       1 - pull up enabled
+                                       2 - pull down enabled
+    bit[22:20]: drive strength: 0 - 2 mA
+                                1 - 4 mA
+                                2 - 6 mA
+                                3 - 8 mA
+                                4 - 10 mA
+                                5 - 12 mA
+                                6 - 14 mA
+                                7 - 16 mA
+
+- gpio-controller:
+    Specifies that the node is a GPIO controller
+
+Optional properties:
+
+- interrupt-controller:
+    Specifies that the node is an interrupt controller. Not all Cygnus GPIO
+interfaces support interrupt, e.g., the CRMU GPIO controller does not have its
+interrupt routed to the main processor's GIC
+
+- interrupts:
+    The interrupt outputs from the GPIO controller.
+
+- no-drv-stregnth:
+    Specifies the GPIO controller does not support drive strength configuration
+
+Example:
+	gpio_asiu: gpio at 180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio at 03024800 {
+		compatible = "brcm,cygnus-crmu-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-drv-stregnth;
+	};
+
+	/*
+	 * Touchscreen that uses the ASIU GPIO 100, with internal pull-up
+	 * enabled
+	 */
+	tsc {
+		...
+		...
+		gpio-event = <&gpio_asiu 100 0x10000>;
+	};
+
+	/* Bluetooth that uses the CRMU GPIO 2, with polarity inverted */
+	bluetooth {
+		...
+		...
+		bcm,rfkill-bank-sel = <&gpio_crmu 2 1>
+	}
-- 
1.7.9.5

[PATCH v3 2/5] gpio: Cygnus: add GPIO driver

[Ray Jui]

This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller, 2) the
chipCommonG GPIO controller, and 3) the ALWAYS-ON GPIO controller

Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
---
 drivers/gpio/Kconfig           |   11 +
 drivers/gpio/Makefile          |    1 +
 drivers/gpio/gpio-bcm-cygnus.c |  705 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 717 insertions(+)
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 633ec21..3e3b0342 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -126,6 +126,17 @@ config GPIO_74XX_MMIO
 	    8 bits:	74244 (Input), 74273 (Output)
 	    16 bits:	741624 (Input), 7416374 (Output)
 
+config GPIO_BCM_CYGNUS
+	bool "Broadcom Cygnus GPIO support"
+	depends on ARCH_BCM_CYGNUS && OF_GPIO
+	help
+	  Say yes here to turn on GPIO support for Broadcom Cygnus SoC
+
+	  The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
+	  GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
+	  the always-ON GPIO controller (CRMU). All 3 GPIO controllers are
+	  supported by this driver
+
 config GPIO_CLPS711X
 	tristate "CLPS711X GPIO support"
 	depends on ARCH_CLPS711X || COMPILE_TEST
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 81755f1..31eb7e0 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_GPIO_ADP5520)	+= gpio-adp5520.o
 obj-$(CONFIG_GPIO_ADP5588)	+= gpio-adp5588.o
 obj-$(CONFIG_GPIO_AMD8111)	+= gpio-amd8111.o
 obj-$(CONFIG_GPIO_ARIZONA)	+= gpio-arizona.o
+obj-$(CONFIG_GPIO_BCM_CYGNUS)	+= gpio-bcm-cygnus.o
 obj-$(CONFIG_GPIO_BCM_KONA)	+= gpio-bcm-kona.o
 obj-$(CONFIG_GPIO_BT8XX)	+= gpio-bt8xx.o
 obj-$(CONFIG_GPIO_CLPS711X)	+= gpio-clps711x.o
diff --git a/drivers/gpio/gpio-bcm-cygnus.c b/drivers/gpio/gpio-bcm-cygnus.c
new file mode 100644
index 0000000..f1f69ce
--- /dev/null
+++ b/drivers/gpio/gpio-bcm-cygnus.c
@@ -0,0 +1,705 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/ioport.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/irqchip/chained_irq.h>
+
+#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
+#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
+#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
+#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
+#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
+#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
+#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
+#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
+#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
+#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
+#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
+#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
+
+/* drive strength control for ASIU GPIO */
+#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
+
+/* drive strength control for CCM GPIO */
+#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00
+
+#define GPIO_BANK_SIZE 0x200
+#define NGPIOS_PER_BANK 32
+#define GPIO_BIT(pin) ((pin) % NGPIOS_PER_BANK)
+#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
+
+#define GPIO_FLAG_BIT_MASK           0xffff
+#define GPIO_PULL_BIT_SHIFT          16
+#define GPIO_PULL_BIT_MASK           0x3
+
+#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
+#define GPIO_DRV_STRENGTH_BITS       3
+#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
+
+/*
+ * For GPIO internal pull up/down registers
+ */
+enum gpio_pull {
+	GPIO_PULL_NONE = 0,
+	GPIO_PULL_UP,
+	GPIO_PULL_DOWN,
+	GPIO_PULL_INVALID,
+};
+
+/*
+ * GPIO drive strength
+ */
+enum gpio_drv_strength {
+	GPIO_DRV_STRENGTH_2MA = 0,
+	GPIO_DRV_STRENGTH_4MA,
+	GPIO_DRV_STRENGTH_6MA,
+	GPIO_DRV_STRENGTH_8MA,
+	GPIO_DRV_STRENGTH_10MA,
+	GPIO_DRV_STRENGTH_12MA,
+	GPIO_DRV_STRENGTH_14MA,
+	GPIO_DRV_STRENGTH_16MA,
+	GPIO_DRV_STRENGTH_INVALID,
+};
+
+struct bcm_cygnus_gpio {
+	struct device *dev;
+	void __iomem *base;
+	void __iomem *io_ctrl;
+	spinlock_t lock;
+	struct gpio_chip gc;
+	unsigned num_banks;
+	int irq;
+	struct irq_domain *irq_domain;
+};
+
+static unsigned int gpio_base_index;
+
+static struct bcm_cygnus_gpio *to_bcm_cygnus_gpio(struct gpio_chip *gc)
+{
+	return container_of(gc, struct bcm_cygnus_gpio, gc);
+}
+
+static int bcm_cygnus_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+
+	return irq_find_mapping(cygnus_gpio->irq_domain, offset);
+}
+
+static unsigned int __gpio_reg_offset(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio)
+{
+	return GPIO_BANK(gpio) * GPIO_BANK_SIZE;
+}
+
+static unsigned int __gpio_bitpos(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio)
+{
+	return GPIO_BIT(gpio);
+}
+
+static void bcm_cygnus_gpio_irq_handler(unsigned int irq,
+		struct irq_desc *desc)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio;
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	int i, bit;
+
+	chained_irq_enter(chip, desc);
+
+	cygnus_gpio = irq_get_handler_data(irq);
+
+	/* go through the entire GPIO banks and handle all interrupts */
+	for (i = 0; i < cygnus_gpio->num_banks; i++) {
+		unsigned long val = readl(cygnus_gpio->base +
+				(i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_MSTAT_OFFSET);
+
+		for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
+			unsigned pin = NGPIOS_PER_BANK * i + bit;
+			int child_irq =
+				bcm_cygnus_gpio_to_irq(&cygnus_gpio->gc, pin);
+
+			/*
+			 * Clear the interrupt before invoking the
+			 * handler, so we do not leave any window
+			 */
+			writel(1 << bit,
+				cygnus_gpio->base + (i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_CLR_OFFSET);
+
+			generic_handle_irq(child_irq);
+		}
+	}
+
+	chained_irq_exit(chip, desc);
+}
+
+static void bcm_cygnus_gpio_irq_ack(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_CLR_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static void bcm_cygnus_gpio_irq_mask(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_MSK_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static void bcm_cygnus_gpio_irq_unmask(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_MSK_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static int bcm_cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int int_type, dual_edge, edge_lvl;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	switch (type & IRQ_TYPE_SENSE_MASK) {
+	case IRQ_TYPE_EDGE_RISING:
+		int_type = 0;
+		dual_edge = 0;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_EDGE_FALLING:
+		int_type = 0;
+		dual_edge = 0;
+		edge_lvl = 0;
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		int_type = 0;
+		dual_edge = 1;
+		edge_lvl = 0;
+		break;
+
+	case IRQ_TYPE_LEVEL_HIGH:
+		int_type = 1;
+		dual_edge = 0;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_LOW:
+		int_type = 1;
+		dual_edge = 0;
+		edge_lvl = 0;
+		break;
+
+	default:
+		dev_err(cygnus_gpio->dev, "invalid GPIO irq type 0x%x\n", type);
+		return -EINVAL;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_IN_TYPE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= int_type << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_DE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= dual_edge << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_EDGE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= edge_lvl << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	return 0;
+}
+
+static struct irq_chip bcm_cygnus_gpio_irq_chip = {
+	.name = "bcm-cygnus-gpio",
+	.irq_ack = bcm_cygnus_gpio_irq_ack,
+	.irq_mask = bcm_cygnus_gpio_irq_mask,
+	.irq_unmask = bcm_cygnus_gpio_irq_unmask,
+	.irq_set_type = bcm_cygnus_gpio_irq_set_type,
+};
+
+static int bcm_cygnus_gpio_direction_input(struct gpio_chip *gc,
+		unsigned gpio)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_OUT_EN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+
+	return 0;
+}
+
+static int bcm_cygnus_gpio_direction_output(struct gpio_chip *gc,
+		unsigned gpio, int value)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_OUT_EN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_OUT_OFFSET;
+
+	val = readl(cygnus_gpio->base + offset);
+	if (value)
+		val |= 1 << shift;
+	else
+		val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+		"gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
+		gpio, offset, shift, val);
+
+	return 0;
+}
+
+static void bcm_cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio,
+		int value)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_OUT_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	if (value)
+		val |= 1 << shift;
+	else
+		val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+		"gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
+		gpio, offset, shift, val);
+}
+
+static int bcm_cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_IN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = readl(cygnus_gpio->base + offset);
+	val = (val >> shift) & 1;
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u val:%u\n",
+			gpio, offset, shift, val);
+
+	return val;
+}
+
+static struct lock_class_key gpio_lock_class;
+
+static int bcm_cygnus_gpio_irq_map(struct irq_domain *d, unsigned int irq,
+				 irq_hw_number_t hwirq)
+{
+	int ret;
+
+	ret = irq_set_chip_data(irq, d->host_data);
+	if (ret < 0)
+		return ret;
+	irq_set_lockdep_class(irq, &gpio_lock_class);
+	irq_set_chip_and_handler(irq, &bcm_cygnus_gpio_irq_chip,
+			handle_simple_irq);
+	set_irq_flags(irq, IRQF_VALID);
+
+	return 0;
+}
+
+static void bcm_cygnus_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
+{
+	irq_set_chip_and_handler(irq, NULL, NULL);
+	irq_set_chip_data(irq, NULL);
+}
+
+static struct irq_domain_ops bcm_cygnus_irq_ops = {
+	.map = bcm_cygnus_gpio_irq_map,
+	.unmap = bcm_cygnus_gpio_irq_unmap,
+	.xlate = irq_domain_xlate_twocell,
+};
+
+#ifdef CONFIG_OF_GPIO
+static void bcm_cygnus_gpio_set_pull(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio, enum gpio_pull pull)
+{
+	unsigned int offset, shift;
+	u32 val, pullup;
+	unsigned long flags;
+
+	switch (pull) {
+	case GPIO_PULL_UP:
+		pullup = 1;
+		break;
+	case GPIO_PULL_DOWN:
+		pullup = 0;
+		break;
+	case GPIO_PULL_NONE:
+	case GPIO_PULL_INVALID:
+	default:
+		return;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	/* set pull up/down */
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_PAD_RES_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	if (pullup)
+		val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	/* enable pad */
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_RES_EN_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static void bcm_cygnus_gpio_set_strength(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio, enum gpio_drv_strength strength)
+{
+	struct device *dev = cygnus_gpio->dev;
+	void __iomem *base;
+	unsigned int i, offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	/* some GPIO controllers do not support drive strength configuration */
+	if (of_find_property(dev->of_node, "no-drv-stregnth", NULL))
+		return;
+
+	if (cygnus_gpio->io_ctrl) {
+		base = cygnus_gpio->io_ctrl;
+		offset = CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET;
+	} else {
+		base = cygnus_gpio->base;
+		offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+			CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET;
+	}
+
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
+		val = readl(base + offset);
+		val &= ~(1 << shift);
+		val |= ((strength >> i) & 0x1) << shift;
+		writel(val, base + offset);
+		offset += 4;
+	}
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static int bcm_cygnus_gpio_of_xlate(struct gpio_chip *gc,
+		const struct of_phandle_args *gpiospec, u32 *flags)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	enum gpio_pull pull;
+	enum gpio_drv_strength strength;
+
+	if (gc->of_gpio_n_cells < 2)
+		return -EINVAL;
+
+	if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
+		return -EINVAL;
+
+	if (gpiospec->args[0] >= gc->ngpio)
+		return -EINVAL;
+
+	pull = (gpiospec->args[1] >> GPIO_PULL_BIT_SHIFT) & GPIO_PULL_BIT_MASK;
+	if (WARN_ON(pull >= GPIO_PULL_INVALID))
+		return -EINVAL;
+
+	strength = (gpiospec->args[1] >> GPIO_DRV_STRENGTH_BIT_SHIFT) &
+		GPIO_DRV_STRENGTH_BIT_MASK;
+
+	if (flags)
+		*flags = gpiospec->args[1] & GPIO_FLAG_BIT_MASK;
+
+	bcm_cygnus_gpio_set_pull(cygnus_gpio, gpiospec->args[0], pull);
+	bcm_cygnus_gpio_set_strength(cygnus_gpio, gpiospec->args[0], strength);
+
+	return gpiospec->args[0];
+}
+#endif
+
+static const struct of_device_id bcm_cygnus_gpio_of_match[] = {
+	{ .compatible = "brcm,cygnus-gpio" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, bcm_cygnus_gpio_of_match);
+
+static int bcm_cygnus_gpio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	const struct of_device_id *match;
+	struct resource *res;
+	struct bcm_cygnus_gpio *cygnus_gpio;
+	struct gpio_chip *gc;
+	u32 i, ngpios;
+	int ret;
+
+	match = of_match_device(bcm_cygnus_gpio_of_match, dev);
+	if (!match) {
+		dev_err(&pdev->dev, "failed to find GPIO controller\n");
+		return -ENODEV;
+	}
+
+	cygnus_gpio = devm_kzalloc(dev, sizeof(*cygnus_gpio), GFP_KERNEL);
+	if (!cygnus_gpio)
+		return -ENOMEM;
+
+	cygnus_gpio->dev = dev;
+	platform_set_drvdata(pdev, cygnus_gpio);
+
+	if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
+		dev_err(&pdev->dev, "missing ngpios device tree property\n");
+		return -ENODEV;
+	}
+	cygnus_gpio->num_banks = (ngpios + NGPIOS_PER_BANK - 1) /
+		NGPIOS_PER_BANK;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "unable to get I/O resource\n");
+		return -ENODEV;
+	}
+
+	cygnus_gpio->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(cygnus_gpio->base)) {
+		dev_err(&pdev->dev, "unable to map I/O memory\n");
+		return PTR_ERR(cygnus_gpio->base);
+	}
+
+	/*
+	 * Only certain types of Cygnus GPIO interfaces have I/O control
+	 * registers
+	 */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (res) {
+		cygnus_gpio->io_ctrl = devm_ioremap_resource(dev, res);
+		if (IS_ERR(cygnus_gpio->io_ctrl)) {
+			dev_err(&pdev->dev, "unable to map I/O memory\n");
+			return PTR_ERR(cygnus_gpio->io_ctrl);
+		}
+	}
+
+	spin_lock_init(&cygnus_gpio->lock);
+
+	gc = &cygnus_gpio->gc;
+	gc->base = gpio_base_index;
+	gpio_base_index += ngpios;
+	gc->ngpio = ngpios;
+	gc->label = dev_name(dev);
+	gc->dev = dev;
+#ifdef CONFIG_OF_GPIO
+	gc->of_node = dev->of_node;
+	gc->of_gpio_n_cells = 2;
+	gc->of_xlate = bcm_cygnus_gpio_of_xlate;
+#endif
+	gc->direction_input = bcm_cygnus_gpio_direction_input;
+	gc->direction_output = bcm_cygnus_gpio_direction_output;
+	gc->set = bcm_cygnus_gpio_set;
+	gc->get = bcm_cygnus_gpio_get;
+	gc->to_irq = bcm_cygnus_gpio_to_irq;
+
+	ret = gpiochip_add(gc);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "unable to add GPIO chip\n");
+		goto err_dec_gpio_base;
+	}
+
+	/*
+	 * Some of the GPIO interfaces do not have interrupt wired to the main
+	 * processor
+	 */
+	cygnus_gpio->irq = platform_get_irq(pdev, 0);
+	if (cygnus_gpio->irq < 0) {
+		ret = cygnus_gpio->irq;
+		if (ret == -EPROBE_DEFER)
+			goto err_rm_gpiochip;
+
+		dev_info(&pdev->dev, "no interrupt hook\n");
+	}
+
+	cygnus_gpio->irq_domain = irq_domain_add_linear(dev->of_node,
+			gc->ngpio, &bcm_cygnus_irq_ops, cygnus_gpio);
+	if (!cygnus_gpio->irq_domain) {
+		dev_err(&pdev->dev, "unable to allocate IRQ domain\n");
+		ret = -ENXIO;
+		goto err_rm_gpiochip;
+	}
+
+	for (i = 0; i < gc->ngpio; i++) {
+		int irq = irq_create_mapping(cygnus_gpio->irq_domain, i);
+
+		irq_set_lockdep_class(irq, &gpio_lock_class);
+		irq_set_chip_data(irq, cygnus_gpio);
+		irq_set_chip_and_handler(irq, &bcm_cygnus_gpio_irq_chip,
+				handle_simple_irq);
+		set_irq_flags(irq, IRQF_VALID);
+	}
+
+	irq_set_chained_handler(cygnus_gpio->irq, bcm_cygnus_gpio_irq_handler);
+	irq_set_handler_data(cygnus_gpio->irq, cygnus_gpio);
+
+	return 0;
+
+err_rm_gpiochip:
+	gpiochip_remove(gc);
+
+err_dec_gpio_base:
+	gpio_base_index -= ngpios;
+	return ret;
+}
+
+static struct platform_driver bcm_cygnus_gpio_driver = {
+	.driver = {
+		.name = "bcm-cygnus-gpio",
+		.owner = THIS_MODULE,
+		.of_match_table = bcm_cygnus_gpio_of_match,
+	},
+	.probe = bcm_cygnus_gpio_probe,
+};
+
+module_platform_driver(bcm_cygnus_gpio_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>");
+MODULE_DESCRIPTION("Broadcom Cygnus GPIO Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

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[PATCH v3 2/5] gpio: Cygnus: add GPIO driver

[Ray Jui]

This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller, 2) the
chipCommonG GPIO controller, and 3) the ALWAYS-ON GPIO controller

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/gpio/Kconfig           |   11 +
 drivers/gpio/Makefile          |    1 +
 drivers/gpio/gpio-bcm-cygnus.c |  705 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 717 insertions(+)
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 633ec21..3e3b0342 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -126,6 +126,17 @@ config GPIO_74XX_MMIO
 	    8 bits:	74244 (Input), 74273 (Output)
 	    16 bits:	741624 (Input), 7416374 (Output)
 
+config GPIO_BCM_CYGNUS
+	bool "Broadcom Cygnus GPIO support"
+	depends on ARCH_BCM_CYGNUS && OF_GPIO
+	help
+	  Say yes here to turn on GPIO support for Broadcom Cygnus SoC
+
+	  The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
+	  GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
+	  the always-ON GPIO controller (CRMU). All 3 GPIO controllers are
+	  supported by this driver
+
 config GPIO_CLPS711X
 	tristate "CLPS711X GPIO support"
 	depends on ARCH_CLPS711X || COMPILE_TEST
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 81755f1..31eb7e0 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_GPIO_ADP5520)	+= gpio-adp5520.o
 obj-$(CONFIG_GPIO_ADP5588)	+= gpio-adp5588.o
 obj-$(CONFIG_GPIO_AMD8111)	+= gpio-amd8111.o
 obj-$(CONFIG_GPIO_ARIZONA)	+= gpio-arizona.o
+obj-$(CONFIG_GPIO_BCM_CYGNUS)	+= gpio-bcm-cygnus.o
 obj-$(CONFIG_GPIO_BCM_KONA)	+= gpio-bcm-kona.o
 obj-$(CONFIG_GPIO_BT8XX)	+= gpio-bt8xx.o
 obj-$(CONFIG_GPIO_CLPS711X)	+= gpio-clps711x.o
diff --git a/drivers/gpio/gpio-bcm-cygnus.c b/drivers/gpio/gpio-bcm-cygnus.c
new file mode 100644
index 0000000..f1f69ce
--- /dev/null
+++ b/drivers/gpio/gpio-bcm-cygnus.c
@@ -0,0 +1,705 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/ioport.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/irqchip/chained_irq.h>
+
+#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
+#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
+#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
+#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
+#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
+#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
+#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
+#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
+#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
+#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
+#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
+#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
+
+/* drive strength control for ASIU GPIO */
+#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
+
+/* drive strength control for CCM GPIO */
+#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00
+
+#define GPIO_BANK_SIZE 0x200
+#define NGPIOS_PER_BANK 32
+#define GPIO_BIT(pin) ((pin) % NGPIOS_PER_BANK)
+#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
+
+#define GPIO_FLAG_BIT_MASK           0xffff
+#define GPIO_PULL_BIT_SHIFT          16
+#define GPIO_PULL_BIT_MASK           0x3
+
+#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
+#define GPIO_DRV_STRENGTH_BITS       3
+#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
+
+/*
+ * For GPIO internal pull up/down registers
+ */
+enum gpio_pull {
+	GPIO_PULL_NONE = 0,
+	GPIO_PULL_UP,
+	GPIO_PULL_DOWN,
+	GPIO_PULL_INVALID,
+};
+
+/*
+ * GPIO drive strength
+ */
+enum gpio_drv_strength {
+	GPIO_DRV_STRENGTH_2MA = 0,
+	GPIO_DRV_STRENGTH_4MA,
+	GPIO_DRV_STRENGTH_6MA,
+	GPIO_DRV_STRENGTH_8MA,
+	GPIO_DRV_STRENGTH_10MA,
+	GPIO_DRV_STRENGTH_12MA,
+	GPIO_DRV_STRENGTH_14MA,
+	GPIO_DRV_STRENGTH_16MA,
+	GPIO_DRV_STRENGTH_INVALID,
+};
+
+struct bcm_cygnus_gpio {
+	struct device *dev;
+	void __iomem *base;
+	void __iomem *io_ctrl;
+	spinlock_t lock;
+	struct gpio_chip gc;
+	unsigned num_banks;
+	int irq;
+	struct irq_domain *irq_domain;
+};
+
+static unsigned int gpio_base_index;
+
+static struct bcm_cygnus_gpio *to_bcm_cygnus_gpio(struct gpio_chip *gc)
+{
+	return container_of(gc, struct bcm_cygnus_gpio, gc);
+}
+
+static int bcm_cygnus_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+
+	return irq_find_mapping(cygnus_gpio->irq_domain, offset);
+}
+
+static unsigned int __gpio_reg_offset(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio)
+{
+	return GPIO_BANK(gpio) * GPIO_BANK_SIZE;
+}
+
+static unsigned int __gpio_bitpos(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio)
+{
+	return GPIO_BIT(gpio);
+}
+
+static void bcm_cygnus_gpio_irq_handler(unsigned int irq,
+		struct irq_desc *desc)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio;
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	int i, bit;
+
+	chained_irq_enter(chip, desc);
+
+	cygnus_gpio = irq_get_handler_data(irq);
+
+	/* go through the entire GPIO banks and handle all interrupts */
+	for (i = 0; i < cygnus_gpio->num_banks; i++) {
+		unsigned long val = readl(cygnus_gpio->base +
+				(i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_MSTAT_OFFSET);
+
+		for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
+			unsigned pin = NGPIOS_PER_BANK * i + bit;
+			int child_irq =
+				bcm_cygnus_gpio_to_irq(&cygnus_gpio->gc, pin);
+
+			/*
+			 * Clear the interrupt before invoking the
+			 * handler, so we do not leave any window
+			 */
+			writel(1 << bit,
+				cygnus_gpio->base + (i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_CLR_OFFSET);
+
+			generic_handle_irq(child_irq);
+		}
+	}
+
+	chained_irq_exit(chip, desc);
+}
+
+static void bcm_cygnus_gpio_irq_ack(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_CLR_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static void bcm_cygnus_gpio_irq_mask(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_MSK_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static void bcm_cygnus_gpio_irq_unmask(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_MSK_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static int bcm_cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int int_type, dual_edge, edge_lvl;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	switch (type & IRQ_TYPE_SENSE_MASK) {
+	case IRQ_TYPE_EDGE_RISING:
+		int_type = 0;
+		dual_edge = 0;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_EDGE_FALLING:
+		int_type = 0;
+		dual_edge = 0;
+		edge_lvl = 0;
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		int_type = 0;
+		dual_edge = 1;
+		edge_lvl = 0;
+		break;
+
+	case IRQ_TYPE_LEVEL_HIGH:
+		int_type = 1;
+		dual_edge = 0;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_LOW:
+		int_type = 1;
+		dual_edge = 0;
+		edge_lvl = 0;
+		break;
+
+	default:
+		dev_err(cygnus_gpio->dev, "invalid GPIO irq type 0x%x\n", type);
+		return -EINVAL;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_IN_TYPE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= int_type << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_DE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= dual_edge << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_EDGE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= edge_lvl << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	return 0;
+}
+
+static struct irq_chip bcm_cygnus_gpio_irq_chip = {
+	.name = "bcm-cygnus-gpio",
+	.irq_ack = bcm_cygnus_gpio_irq_ack,
+	.irq_mask = bcm_cygnus_gpio_irq_mask,
+	.irq_unmask = bcm_cygnus_gpio_irq_unmask,
+	.irq_set_type = bcm_cygnus_gpio_irq_set_type,
+};
+
+static int bcm_cygnus_gpio_direction_input(struct gpio_chip *gc,
+		unsigned gpio)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_OUT_EN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+
+	return 0;
+}
+
+static int bcm_cygnus_gpio_direction_output(struct gpio_chip *gc,
+		unsigned gpio, int value)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_OUT_EN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_OUT_OFFSET;
+
+	val = readl(cygnus_gpio->base + offset);
+	if (value)
+		val |= 1 << shift;
+	else
+		val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+		"gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
+		gpio, offset, shift, val);
+
+	return 0;
+}
+
+static void bcm_cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio,
+		int value)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_OUT_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	if (value)
+		val |= 1 << shift;
+	else
+		val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+		"gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
+		gpio, offset, shift, val);
+}
+
+static int bcm_cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_IN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = readl(cygnus_gpio->base + offset);
+	val = (val >> shift) & 1;
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u val:%u\n",
+			gpio, offset, shift, val);
+
+	return val;
+}
+
+static struct lock_class_key gpio_lock_class;
+
+static int bcm_cygnus_gpio_irq_map(struct irq_domain *d, unsigned int irq,
+				 irq_hw_number_t hwirq)
+{
+	int ret;
+
+	ret = irq_set_chip_data(irq, d->host_data);
+	if (ret < 0)
+		return ret;
+	irq_set_lockdep_class(irq, &gpio_lock_class);
+	irq_set_chip_and_handler(irq, &bcm_cygnus_gpio_irq_chip,
+			handle_simple_irq);
+	set_irq_flags(irq, IRQF_VALID);
+
+	return 0;
+}
+
+static void bcm_cygnus_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
+{
+	irq_set_chip_and_handler(irq, NULL, NULL);
+	irq_set_chip_data(irq, NULL);
+}
+
+static struct irq_domain_ops bcm_cygnus_irq_ops = {
+	.map = bcm_cygnus_gpio_irq_map,
+	.unmap = bcm_cygnus_gpio_irq_unmap,
+	.xlate = irq_domain_xlate_twocell,
+};
+
+#ifdef CONFIG_OF_GPIO
+static void bcm_cygnus_gpio_set_pull(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio, enum gpio_pull pull)
+{
+	unsigned int offset, shift;
+	u32 val, pullup;
+	unsigned long flags;
+
+	switch (pull) {
+	case GPIO_PULL_UP:
+		pullup = 1;
+		break;
+	case GPIO_PULL_DOWN:
+		pullup = 0;
+		break;
+	case GPIO_PULL_NONE:
+	case GPIO_PULL_INVALID:
+	default:
+		return;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	/* set pull up/down */
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_PAD_RES_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	if (pullup)
+		val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	/* enable pad */
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_RES_EN_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static void bcm_cygnus_gpio_set_strength(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio, enum gpio_drv_strength strength)
+{
+	struct device *dev = cygnus_gpio->dev;
+	void __iomem *base;
+	unsigned int i, offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	/* some GPIO controllers do not support drive strength configuration */
+	if (of_find_property(dev->of_node, "no-drv-stregnth", NULL))
+		return;
+
+	if (cygnus_gpio->io_ctrl) {
+		base = cygnus_gpio->io_ctrl;
+		offset = CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET;
+	} else {
+		base = cygnus_gpio->base;
+		offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+			CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET;
+	}
+
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
+		val = readl(base + offset);
+		val &= ~(1 << shift);
+		val |= ((strength >> i) & 0x1) << shift;
+		writel(val, base + offset);
+		offset += 4;
+	}
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static int bcm_cygnus_gpio_of_xlate(struct gpio_chip *gc,
+		const struct of_phandle_args *gpiospec, u32 *flags)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	enum gpio_pull pull;
+	enum gpio_drv_strength strength;
+
+	if (gc->of_gpio_n_cells < 2)
+		return -EINVAL;
+
+	if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
+		return -EINVAL;
+
+	if (gpiospec->args[0] >= gc->ngpio)
+		return -EINVAL;
+
+	pull = (gpiospec->args[1] >> GPIO_PULL_BIT_SHIFT) & GPIO_PULL_BIT_MASK;
+	if (WARN_ON(pull >= GPIO_PULL_INVALID))
+		return -EINVAL;
+
+	strength = (gpiospec->args[1] >> GPIO_DRV_STRENGTH_BIT_SHIFT) &
+		GPIO_DRV_STRENGTH_BIT_MASK;
+
+	if (flags)
+		*flags = gpiospec->args[1] & GPIO_FLAG_BIT_MASK;
+
+	bcm_cygnus_gpio_set_pull(cygnus_gpio, gpiospec->args[0], pull);
+	bcm_cygnus_gpio_set_strength(cygnus_gpio, gpiospec->args[0], strength);
+
+	return gpiospec->args[0];
+}
+#endif
+
+static const struct of_device_id bcm_cygnus_gpio_of_match[] = {
+	{ .compatible = "brcm,cygnus-gpio" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, bcm_cygnus_gpio_of_match);
+
+static int bcm_cygnus_gpio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	const struct of_device_id *match;
+	struct resource *res;
+	struct bcm_cygnus_gpio *cygnus_gpio;
+	struct gpio_chip *gc;
+	u32 i, ngpios;
+	int ret;
+
+	match = of_match_device(bcm_cygnus_gpio_of_match, dev);
+	if (!match) {
+		dev_err(&pdev->dev, "failed to find GPIO controller\n");
+		return -ENODEV;
+	}
+
+	cygnus_gpio = devm_kzalloc(dev, sizeof(*cygnus_gpio), GFP_KERNEL);
+	if (!cygnus_gpio)
+		return -ENOMEM;
+
+	cygnus_gpio->dev = dev;
+	platform_set_drvdata(pdev, cygnus_gpio);
+
+	if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
+		dev_err(&pdev->dev, "missing ngpios device tree property\n");
+		return -ENODEV;
+	}
+	cygnus_gpio->num_banks = (ngpios + NGPIOS_PER_BANK - 1) /
+		NGPIOS_PER_BANK;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "unable to get I/O resource\n");
+		return -ENODEV;
+	}
+
+	cygnus_gpio->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(cygnus_gpio->base)) {
+		dev_err(&pdev->dev, "unable to map I/O memory\n");
+		return PTR_ERR(cygnus_gpio->base);
+	}
+
+	/*
+	 * Only certain types of Cygnus GPIO interfaces have I/O control
+	 * registers
+	 */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (res) {
+		cygnus_gpio->io_ctrl = devm_ioremap_resource(dev, res);
+		if (IS_ERR(cygnus_gpio->io_ctrl)) {
+			dev_err(&pdev->dev, "unable to map I/O memory\n");
+			return PTR_ERR(cygnus_gpio->io_ctrl);
+		}
+	}
+
+	spin_lock_init(&cygnus_gpio->lock);
+
+	gc = &cygnus_gpio->gc;
+	gc->base = gpio_base_index;
+	gpio_base_index += ngpios;
+	gc->ngpio = ngpios;
+	gc->label = dev_name(dev);
+	gc->dev = dev;
+#ifdef CONFIG_OF_GPIO
+	gc->of_node = dev->of_node;
+	gc->of_gpio_n_cells = 2;
+	gc->of_xlate = bcm_cygnus_gpio_of_xlate;
+#endif
+	gc->direction_input = bcm_cygnus_gpio_direction_input;
+	gc->direction_output = bcm_cygnus_gpio_direction_output;
+	gc->set = bcm_cygnus_gpio_set;
+	gc->get = bcm_cygnus_gpio_get;
+	gc->to_irq = bcm_cygnus_gpio_to_irq;
+
+	ret = gpiochip_add(gc);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "unable to add GPIO chip\n");
+		goto err_dec_gpio_base;
+	}
+
+	/*
+	 * Some of the GPIO interfaces do not have interrupt wired to the main
+	 * processor
+	 */
+	cygnus_gpio->irq = platform_get_irq(pdev, 0);
+	if (cygnus_gpio->irq < 0) {
+		ret = cygnus_gpio->irq;
+		if (ret == -EPROBE_DEFER)
+			goto err_rm_gpiochip;
+
+		dev_info(&pdev->dev, "no interrupt hook\n");
+	}
+
+	cygnus_gpio->irq_domain = irq_domain_add_linear(dev->of_node,
+			gc->ngpio, &bcm_cygnus_irq_ops, cygnus_gpio);
+	if (!cygnus_gpio->irq_domain) {
+		dev_err(&pdev->dev, "unable to allocate IRQ domain\n");
+		ret = -ENXIO;
+		goto err_rm_gpiochip;
+	}
+
+	for (i = 0; i < gc->ngpio; i++) {
+		int irq = irq_create_mapping(cygnus_gpio->irq_domain, i);
+
+		irq_set_lockdep_class(irq, &gpio_lock_class);
+		irq_set_chip_data(irq, cygnus_gpio);
+		irq_set_chip_and_handler(irq, &bcm_cygnus_gpio_irq_chip,
+				handle_simple_irq);
+		set_irq_flags(irq, IRQF_VALID);
+	}
+
+	irq_set_chained_handler(cygnus_gpio->irq, bcm_cygnus_gpio_irq_handler);
+	irq_set_handler_data(cygnus_gpio->irq, cygnus_gpio);
+
+	return 0;
+
+err_rm_gpiochip:
+	gpiochip_remove(gc);
+
+err_dec_gpio_base:
+	gpio_base_index -= ngpios;
+	return ret;
+}
+
+static struct platform_driver bcm_cygnus_gpio_driver = {
+	.driver = {
+		.name = "bcm-cygnus-gpio",
+		.owner = THIS_MODULE,
+		.of_match_table = bcm_cygnus_gpio_of_match,
+	},
+	.probe = bcm_cygnus_gpio_probe,
+};
+
+module_platform_driver(bcm_cygnus_gpio_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus GPIO Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v3 2/5] gpio: Cygnus: add GPIO driver

[Ray Jui]

This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller, 2) the
chipCommonG GPIO controller, and 3) the ALWAYS-ON GPIO controller

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/gpio/Kconfig           |   11 +
 drivers/gpio/Makefile          |    1 +
 drivers/gpio/gpio-bcm-cygnus.c |  705 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 717 insertions(+)
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 633ec21..3e3b0342 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -126,6 +126,17 @@ config GPIO_74XX_MMIO
 	    8 bits:	74244 (Input), 74273 (Output)
 	    16 bits:	741624 (Input), 7416374 (Output)
 
+config GPIO_BCM_CYGNUS
+	bool "Broadcom Cygnus GPIO support"
+	depends on ARCH_BCM_CYGNUS && OF_GPIO
+	help
+	  Say yes here to turn on GPIO support for Broadcom Cygnus SoC
+
+	  The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
+	  GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
+	  the always-ON GPIO controller (CRMU). All 3 GPIO controllers are
+	  supported by this driver
+
 config GPIO_CLPS711X
 	tristate "CLPS711X GPIO support"
 	depends on ARCH_CLPS711X || COMPILE_TEST
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 81755f1..31eb7e0 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_GPIO_ADP5520)	+= gpio-adp5520.o
 obj-$(CONFIG_GPIO_ADP5588)	+= gpio-adp5588.o
 obj-$(CONFIG_GPIO_AMD8111)	+= gpio-amd8111.o
 obj-$(CONFIG_GPIO_ARIZONA)	+= gpio-arizona.o
+obj-$(CONFIG_GPIO_BCM_CYGNUS)	+= gpio-bcm-cygnus.o
 obj-$(CONFIG_GPIO_BCM_KONA)	+= gpio-bcm-kona.o
 obj-$(CONFIG_GPIO_BT8XX)	+= gpio-bt8xx.o
 obj-$(CONFIG_GPIO_CLPS711X)	+= gpio-clps711x.o
diff --git a/drivers/gpio/gpio-bcm-cygnus.c b/drivers/gpio/gpio-bcm-cygnus.c
new file mode 100644
index 0000000..f1f69ce
--- /dev/null
+++ b/drivers/gpio/gpio-bcm-cygnus.c
@@ -0,0 +1,705 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/ioport.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/irqchip/chained_irq.h>
+
+#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
+#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
+#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
+#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
+#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
+#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
+#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
+#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
+#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
+#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
+#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
+#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
+
+/* drive strength control for ASIU GPIO */
+#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
+
+/* drive strength control for CCM GPIO */
+#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00
+
+#define GPIO_BANK_SIZE 0x200
+#define NGPIOS_PER_BANK 32
+#define GPIO_BIT(pin) ((pin) % NGPIOS_PER_BANK)
+#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
+
+#define GPIO_FLAG_BIT_MASK           0xffff
+#define GPIO_PULL_BIT_SHIFT          16
+#define GPIO_PULL_BIT_MASK           0x3
+
+#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
+#define GPIO_DRV_STRENGTH_BITS       3
+#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
+
+/*
+ * For GPIO internal pull up/down registers
+ */
+enum gpio_pull {
+	GPIO_PULL_NONE = 0,
+	GPIO_PULL_UP,
+	GPIO_PULL_DOWN,
+	GPIO_PULL_INVALID,
+};
+
+/*
+ * GPIO drive strength
+ */
+enum gpio_drv_strength {
+	GPIO_DRV_STRENGTH_2MA = 0,
+	GPIO_DRV_STRENGTH_4MA,
+	GPIO_DRV_STRENGTH_6MA,
+	GPIO_DRV_STRENGTH_8MA,
+	GPIO_DRV_STRENGTH_10MA,
+	GPIO_DRV_STRENGTH_12MA,
+	GPIO_DRV_STRENGTH_14MA,
+	GPIO_DRV_STRENGTH_16MA,
+	GPIO_DRV_STRENGTH_INVALID,
+};
+
+struct bcm_cygnus_gpio {
+	struct device *dev;
+	void __iomem *base;
+	void __iomem *io_ctrl;
+	spinlock_t lock;
+	struct gpio_chip gc;
+	unsigned num_banks;
+	int irq;
+	struct irq_domain *irq_domain;
+};
+
+static unsigned int gpio_base_index;
+
+static struct bcm_cygnus_gpio *to_bcm_cygnus_gpio(struct gpio_chip *gc)
+{
+	return container_of(gc, struct bcm_cygnus_gpio, gc);
+}
+
+static int bcm_cygnus_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+
+	return irq_find_mapping(cygnus_gpio->irq_domain, offset);
+}
+
+static unsigned int __gpio_reg_offset(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio)
+{
+	return GPIO_BANK(gpio) * GPIO_BANK_SIZE;
+}
+
+static unsigned int __gpio_bitpos(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio)
+{
+	return GPIO_BIT(gpio);
+}
+
+static void bcm_cygnus_gpio_irq_handler(unsigned int irq,
+		struct irq_desc *desc)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio;
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	int i, bit;
+
+	chained_irq_enter(chip, desc);
+
+	cygnus_gpio = irq_get_handler_data(irq);
+
+	/* go through the entire GPIO banks and handle all interrupts */
+	for (i = 0; i < cygnus_gpio->num_banks; i++) {
+		unsigned long val = readl(cygnus_gpio->base +
+				(i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_MSTAT_OFFSET);
+
+		for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
+			unsigned pin = NGPIOS_PER_BANK * i + bit;
+			int child_irq =
+				bcm_cygnus_gpio_to_irq(&cygnus_gpio->gc, pin);
+
+			/*
+			 * Clear the interrupt before invoking the
+			 * handler, so we do not leave any window
+			 */
+			writel(1 << bit,
+				cygnus_gpio->base + (i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_CLR_OFFSET);
+
+			generic_handle_irq(child_irq);
+		}
+	}
+
+	chained_irq_exit(chip, desc);
+}
+
+static void bcm_cygnus_gpio_irq_ack(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_CLR_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static void bcm_cygnus_gpio_irq_mask(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_MSK_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static void bcm_cygnus_gpio_irq_unmask(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_MSK_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static int bcm_cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int int_type, dual_edge, edge_lvl;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	switch (type & IRQ_TYPE_SENSE_MASK) {
+	case IRQ_TYPE_EDGE_RISING:
+		int_type = 0;
+		dual_edge = 0;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_EDGE_FALLING:
+		int_type = 0;
+		dual_edge = 0;
+		edge_lvl = 0;
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		int_type = 0;
+		dual_edge = 1;
+		edge_lvl = 0;
+		break;
+
+	case IRQ_TYPE_LEVEL_HIGH:
+		int_type = 1;
+		dual_edge = 0;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_LOW:
+		int_type = 1;
+		dual_edge = 0;
+		edge_lvl = 0;
+		break;
+
+	default:
+		dev_err(cygnus_gpio->dev, "invalid GPIO irq type 0x%x\n", type);
+		return -EINVAL;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_IN_TYPE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= int_type << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_DE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= dual_edge << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_EDGE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= edge_lvl << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	return 0;
+}
+
+static struct irq_chip bcm_cygnus_gpio_irq_chip = {
+	.name = "bcm-cygnus-gpio",
+	.irq_ack = bcm_cygnus_gpio_irq_ack,
+	.irq_mask = bcm_cygnus_gpio_irq_mask,
+	.irq_unmask = bcm_cygnus_gpio_irq_unmask,
+	.irq_set_type = bcm_cygnus_gpio_irq_set_type,
+};
+
+static int bcm_cygnus_gpio_direction_input(struct gpio_chip *gc,
+		unsigned gpio)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_OUT_EN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+
+	return 0;
+}
+
+static int bcm_cygnus_gpio_direction_output(struct gpio_chip *gc,
+		unsigned gpio, int value)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_OUT_EN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_OUT_OFFSET;
+
+	val = readl(cygnus_gpio->base + offset);
+	if (value)
+		val |= 1 << shift;
+	else
+		val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+		"gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
+		gpio, offset, shift, val);
+
+	return 0;
+}
+
+static void bcm_cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio,
+		int value)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_OUT_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	if (value)
+		val |= 1 << shift;
+	else
+		val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+		"gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
+		gpio, offset, shift, val);
+}
+
+static int bcm_cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_IN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = readl(cygnus_gpio->base + offset);
+	val = (val >> shift) & 1;
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u val:%u\n",
+			gpio, offset, shift, val);
+
+	return val;
+}
+
+static struct lock_class_key gpio_lock_class;
+
+static int bcm_cygnus_gpio_irq_map(struct irq_domain *d, unsigned int irq,
+				 irq_hw_number_t hwirq)
+{
+	int ret;
+
+	ret = irq_set_chip_data(irq, d->host_data);
+	if (ret < 0)
+		return ret;
+	irq_set_lockdep_class(irq, &gpio_lock_class);
+	irq_set_chip_and_handler(irq, &bcm_cygnus_gpio_irq_chip,
+			handle_simple_irq);
+	set_irq_flags(irq, IRQF_VALID);
+
+	return 0;
+}
+
+static void bcm_cygnus_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
+{
+	irq_set_chip_and_handler(irq, NULL, NULL);
+	irq_set_chip_data(irq, NULL);
+}
+
+static struct irq_domain_ops bcm_cygnus_irq_ops = {
+	.map = bcm_cygnus_gpio_irq_map,
+	.unmap = bcm_cygnus_gpio_irq_unmap,
+	.xlate = irq_domain_xlate_twocell,
+};
+
+#ifdef CONFIG_OF_GPIO
+static void bcm_cygnus_gpio_set_pull(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio, enum gpio_pull pull)
+{
+	unsigned int offset, shift;
+	u32 val, pullup;
+	unsigned long flags;
+
+	switch (pull) {
+	case GPIO_PULL_UP:
+		pullup = 1;
+		break;
+	case GPIO_PULL_DOWN:
+		pullup = 0;
+		break;
+	case GPIO_PULL_NONE:
+	case GPIO_PULL_INVALID:
+	default:
+		return;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	/* set pull up/down */
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_PAD_RES_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	if (pullup)
+		val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	/* enable pad */
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_RES_EN_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static void bcm_cygnus_gpio_set_strength(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio, enum gpio_drv_strength strength)
+{
+	struct device *dev = cygnus_gpio->dev;
+	void __iomem *base;
+	unsigned int i, offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	/* some GPIO controllers do not support drive strength configuration */
+	if (of_find_property(dev->of_node, "no-drv-stregnth", NULL))
+		return;
+
+	if (cygnus_gpio->io_ctrl) {
+		base = cygnus_gpio->io_ctrl;
+		offset = CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET;
+	} else {
+		base = cygnus_gpio->base;
+		offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+			CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET;
+	}
+
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
+		val = readl(base + offset);
+		val &= ~(1 << shift);
+		val |= ((strength >> i) & 0x1) << shift;
+		writel(val, base + offset);
+		offset += 4;
+	}
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static int bcm_cygnus_gpio_of_xlate(struct gpio_chip *gc,
+		const struct of_phandle_args *gpiospec, u32 *flags)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	enum gpio_pull pull;
+	enum gpio_drv_strength strength;
+
+	if (gc->of_gpio_n_cells < 2)
+		return -EINVAL;
+
+	if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
+		return -EINVAL;
+
+	if (gpiospec->args[0] >= gc->ngpio)
+		return -EINVAL;
+
+	pull = (gpiospec->args[1] >> GPIO_PULL_BIT_SHIFT) & GPIO_PULL_BIT_MASK;
+	if (WARN_ON(pull >= GPIO_PULL_INVALID))
+		return -EINVAL;
+
+	strength = (gpiospec->args[1] >> GPIO_DRV_STRENGTH_BIT_SHIFT) &
+		GPIO_DRV_STRENGTH_BIT_MASK;
+
+	if (flags)
+		*flags = gpiospec->args[1] & GPIO_FLAG_BIT_MASK;
+
+	bcm_cygnus_gpio_set_pull(cygnus_gpio, gpiospec->args[0], pull);
+	bcm_cygnus_gpio_set_strength(cygnus_gpio, gpiospec->args[0], strength);
+
+	return gpiospec->args[0];
+}
+#endif
+
+static const struct of_device_id bcm_cygnus_gpio_of_match[] = {
+	{ .compatible = "brcm,cygnus-gpio" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, bcm_cygnus_gpio_of_match);
+
+static int bcm_cygnus_gpio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	const struct of_device_id *match;
+	struct resource *res;
+	struct bcm_cygnus_gpio *cygnus_gpio;
+	struct gpio_chip *gc;
+	u32 i, ngpios;
+	int ret;
+
+	match = of_match_device(bcm_cygnus_gpio_of_match, dev);
+	if (!match) {
+		dev_err(&pdev->dev, "failed to find GPIO controller\n");
+		return -ENODEV;
+	}
+
+	cygnus_gpio = devm_kzalloc(dev, sizeof(*cygnus_gpio), GFP_KERNEL);
+	if (!cygnus_gpio)
+		return -ENOMEM;
+
+	cygnus_gpio->dev = dev;
+	platform_set_drvdata(pdev, cygnus_gpio);
+
+	if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
+		dev_err(&pdev->dev, "missing ngpios device tree property\n");
+		return -ENODEV;
+	}
+	cygnus_gpio->num_banks = (ngpios + NGPIOS_PER_BANK - 1) /
+		NGPIOS_PER_BANK;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "unable to get I/O resource\n");
+		return -ENODEV;
+	}
+
+	cygnus_gpio->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(cygnus_gpio->base)) {
+		dev_err(&pdev->dev, "unable to map I/O memory\n");
+		return PTR_ERR(cygnus_gpio->base);
+	}
+
+	/*
+	 * Only certain types of Cygnus GPIO interfaces have I/O control
+	 * registers
+	 */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (res) {
+		cygnus_gpio->io_ctrl = devm_ioremap_resource(dev, res);
+		if (IS_ERR(cygnus_gpio->io_ctrl)) {
+			dev_err(&pdev->dev, "unable to map I/O memory\n");
+			return PTR_ERR(cygnus_gpio->io_ctrl);
+		}
+	}
+
+	spin_lock_init(&cygnus_gpio->lock);
+
+	gc = &cygnus_gpio->gc;
+	gc->base = gpio_base_index;
+	gpio_base_index += ngpios;
+	gc->ngpio = ngpios;
+	gc->label = dev_name(dev);
+	gc->dev = dev;
+#ifdef CONFIG_OF_GPIO
+	gc->of_node = dev->of_node;
+	gc->of_gpio_n_cells = 2;
+	gc->of_xlate = bcm_cygnus_gpio_of_xlate;
+#endif
+	gc->direction_input = bcm_cygnus_gpio_direction_input;
+	gc->direction_output = bcm_cygnus_gpio_direction_output;
+	gc->set = bcm_cygnus_gpio_set;
+	gc->get = bcm_cygnus_gpio_get;
+	gc->to_irq = bcm_cygnus_gpio_to_irq;
+
+	ret = gpiochip_add(gc);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "unable to add GPIO chip\n");
+		goto err_dec_gpio_base;
+	}
+
+	/*
+	 * Some of the GPIO interfaces do not have interrupt wired to the main
+	 * processor
+	 */
+	cygnus_gpio->irq = platform_get_irq(pdev, 0);
+	if (cygnus_gpio->irq < 0) {
+		ret = cygnus_gpio->irq;
+		if (ret == -EPROBE_DEFER)
+			goto err_rm_gpiochip;
+
+		dev_info(&pdev->dev, "no interrupt hook\n");
+	}
+
+	cygnus_gpio->irq_domain = irq_domain_add_linear(dev->of_node,
+			gc->ngpio, &bcm_cygnus_irq_ops, cygnus_gpio);
+	if (!cygnus_gpio->irq_domain) {
+		dev_err(&pdev->dev, "unable to allocate IRQ domain\n");
+		ret = -ENXIO;
+		goto err_rm_gpiochip;
+	}
+
+	for (i = 0; i < gc->ngpio; i++) {
+		int irq = irq_create_mapping(cygnus_gpio->irq_domain, i);
+
+		irq_set_lockdep_class(irq, &gpio_lock_class);
+		irq_set_chip_data(irq, cygnus_gpio);
+		irq_set_chip_and_handler(irq, &bcm_cygnus_gpio_irq_chip,
+				handle_simple_irq);
+		set_irq_flags(irq, IRQF_VALID);
+	}
+
+	irq_set_chained_handler(cygnus_gpio->irq, bcm_cygnus_gpio_irq_handler);
+	irq_set_handler_data(cygnus_gpio->irq, cygnus_gpio);
+
+	return 0;
+
+err_rm_gpiochip:
+	gpiochip_remove(gc);
+
+err_dec_gpio_base:
+	gpio_base_index -= ngpios;
+	return ret;
+}
+
+static struct platform_driver bcm_cygnus_gpio_driver = {
+	.driver = {
+		.name = "bcm-cygnus-gpio",
+		.owner = THIS_MODULE,
+		.of_match_table = bcm_cygnus_gpio_of_match,
+	},
+	.probe = bcm_cygnus_gpio_probe,
+};
+
+module_platform_driver(bcm_cygnus_gpio_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus GPIO Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v3 3/5] ARM: mach-bcm: Enable GPIO support for Cygnus

[Ray Jui]

Enable GPIO driver for Broadcom Cygnus SoC by selecting GPIO_BCM_CYGNUS

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/mach-bcm/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index aaeec78..5066d5d 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -29,6 +29,7 @@ config ARCH_BCM_IPROC
 config ARCH_BCM_CYGNUS
 	bool "Broadcom Cygnus Support" if ARCH_MULTI_V7
 	select ARCH_BCM_IPROC
+	select GPIO_BCM_CYGNUS
 	help
 	  Enable support for the Cygnus family,
 	  which includes the following variants:
-- 
1.7.9.5

[PATCH v3 3/5] ARM: mach-bcm: Enable GPIO support for Cygnus

[Ray Jui]

Enable GPIO driver for Broadcom Cygnus SoC by selecting GPIO_BCM_CYGNUS

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/mach-bcm/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index aaeec78..5066d5d 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -29,6 +29,7 @@ config ARCH_BCM_IPROC
 config ARCH_BCM_CYGNUS
 	bool "Broadcom Cygnus Support" if ARCH_MULTI_V7
 	select ARCH_BCM_IPROC
+	select GPIO_BCM_CYGNUS
 	help
 	  Enable support for the Cygnus family,
 	  which includes the following variants:
-- 
1.7.9.5

[PATCH v3 3/5] ARM: mach-bcm: Enable GPIO support for Cygnus

[Ray Jui]

Enable GPIO driver for Broadcom Cygnus SoC by selecting GPIO_BCM_CYGNUS

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/mach-bcm/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index aaeec78..5066d5d 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -29,6 +29,7 @@ config ARCH_BCM_IPROC
 config ARCH_BCM_CYGNUS
 	bool "Broadcom Cygnus Support" if ARCH_MULTI_V7
 	select ARCH_BCM_IPROC
+	select GPIO_BCM_CYGNUS
 	help
 	  Enable support for the Cygnus family,
 	  which includes the following variants:
-- 
1.7.9.5

[PATCH v3 4/5] ARM: dts: enable GPIO for Broadcom Cygnus

[Ray Jui]

This enables all 3 GPIO controllers including the ASIU GPIO, the
chipcommonG GPIO, and the ALWAYS-ON GPIO, for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..48339d0 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -54,6 +54,36 @@
 
 	/include/ "bcm-cygnus-clock.dtsi"
 
+	gpio_ccm: gpio@1800a000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x1800a000 0x50>,
+			<0x0301d164 0x20>;
+		ngpios = <24>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+	};
+
+	gpio_asiu: gpio@180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio@03024800 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-drv-stregnth;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

[PATCH v3 4/5] ARM: dts: enable GPIO for Broadcom Cygnus

[Ray Jui]

This enables all 3 GPIO controllers including the ASIU GPIO, the
chipcommonG GPIO, and the ALWAYS-ON GPIO, for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..48339d0 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -54,6 +54,36 @@
 
 	/include/ "bcm-cygnus-clock.dtsi"
 
+	gpio_ccm: gpio@1800a000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x1800a000 0x50>,
+			<0x0301d164 0x20>;
+		ngpios = <24>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+	};
+
+	gpio_asiu: gpio@180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio@03024800 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-drv-stregnth;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

[PATCH v3 4/5] ARM: dts: enable GPIO for Broadcom Cygnus

[Ray Jui]

This enables all 3 GPIO controllers including the ASIU GPIO, the
chipcommonG GPIO, and the ALWAYS-ON GPIO, for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..48339d0 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -54,6 +54,36 @@
 
 	/include/ "bcm-cygnus-clock.dtsi"
 
+	gpio_ccm: gpio at 1800a000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x1800a000 0x50>,
+			<0x0301d164 0x20>;
+		ngpios = <24>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+	};
+
+	gpio_asiu: gpio at 180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio at 03024800 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-drv-stregnth;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

[PATCH v3 5/5] MAINTAINERS: Entry for Cygnus GPIO driver

[Ray Jui]

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 MAINTAINERS |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index e6bff3a..8473422 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2202,6 +2202,13 @@ N:	bcm9583*
 N:	bcm583*
 N:	bcm113*
 
+BROADCOM CYGNUS GPIO DRIVER
+M:	Ray Jui <rjui@broadcom.com>
+L:	bcm-kernel-feedback-list@broadcom.com
+S:	Supported
+F:	drivers/gpio/gpio-bcm-cygnus.c
+F:	Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
+
 BROADCOM KONA GPIO DRIVER
 M:	Ray Jui <rjui@broadcom.com>
 L:	bcm-kernel-feedback-list@broadcom.com
-- 
1.7.9.5

[PATCH v3 5/5] MAINTAINERS: Entry for Cygnus GPIO driver

[Ray Jui]

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 MAINTAINERS |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index e6bff3a..8473422 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2202,6 +2202,13 @@ N:	bcm9583*
 N:	bcm583*
 N:	bcm113*
 
+BROADCOM CYGNUS GPIO DRIVER
+M:	Ray Jui <rjui@broadcom.com>
+L:	bcm-kernel-feedback-list@broadcom.com
+S:	Supported
+F:	drivers/gpio/gpio-bcm-cygnus.c
+F:	Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
+
 BROADCOM KONA GPIO DRIVER
 M:	Ray Jui <rjui@broadcom.com>
 L:	bcm-kernel-feedback-list@broadcom.com
-- 
1.7.9.5

[PATCH v3 5/5] MAINTAINERS: Entry for Cygnus GPIO driver

[Ray Jui]

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 MAINTAINERS |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index e6bff3a..8473422 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2202,6 +2202,13 @@ N:	bcm9583*
 N:	bcm583*
 N:	bcm113*
 
+BROADCOM CYGNUS GPIO DRIVER
+M:	Ray Jui <rjui@broadcom.com>
+L:	bcm-kernel-feedback-list at broadcom.com
+S:	Supported
+F:	drivers/gpio/gpio-bcm-cygnus.c
+F:	Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
+
 BROADCOM KONA GPIO DRIVER
 M:	Ray Jui <rjui@broadcom.com>
 L:	bcm-kernel-feedback-list at broadcom.com
-- 
1.7.9.5

Re: [PATCH v2 0/5] Add gpio support to Broadcom Cygnus SoC

[Ray Jui]

Sorry. Please ignore this particular cover letter. It accidentally got 
sent along with other v3 patches.

On 12/8/2014 10:47 AM, Ray Jui wrote:
> This patchset contains the initial GPIO support for the Broadcom Cygnus SoC.
> Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
> and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
> the same Cygnus GPIO driver
>
> Changes from v1:
>   - Get rid of inline qualifier
>   - Get rid of redundant check in the ISR
>   - Other minor fixes to imrove code readability
>
> Ray Jui (5):
>    gpio: Cygnus: define Broadcom Cygnus GPIO binding
>    gpio: Cygnus: add GPIO driver
>    ARM: mach-bcm: Enable GPIO support for Cygnus
>    ARM: dts: enable GPIO for Broadcom Cygnus
>    MAINTAINERS: Entry for Cygnus GPIO driver
>
>   .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   85 +++
>   MAINTAINERS                                        |    7 +
>   arch/arm/boot/dts/bcm-cygnus.dtsi                  |   30 +
>   arch/arm/mach-bcm/Kconfig                          |    1 +
>   drivers/gpio/Kconfig                               |   11 +
>   drivers/gpio/Makefile                              |    1 +
>   drivers/gpio/gpio-bcm-cygnus.c                     |  712 ++++++++++++++++++++
>   7 files changed, 847 insertions(+)
>   create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
>   create mode 100644 drivers/gpio/gpio-bcm-cygnus.c
>
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Re: [PATCH v2 0/5] Add gpio support to Broadcom Cygnus SoC

[Ray Jui]

Sorry. Please ignore this particular cover letter. It accidentally got 
sent along with other v3 patches.

On 12/8/2014 10:47 AM, Ray Jui wrote:
> This patchset contains the initial GPIO support for the Broadcom Cygnus SoC.
> Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
> and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
> the same Cygnus GPIO driver
>
> Changes from v1:
>   - Get rid of inline qualifier
>   - Get rid of redundant check in the ISR
>   - Other minor fixes to imrove code readability
>
> Ray Jui (5):
>    gpio: Cygnus: define Broadcom Cygnus GPIO binding
>    gpio: Cygnus: add GPIO driver
>    ARM: mach-bcm: Enable GPIO support for Cygnus
>    ARM: dts: enable GPIO for Broadcom Cygnus
>    MAINTAINERS: Entry for Cygnus GPIO driver
>
>   .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   85 +++
>   MAINTAINERS                                        |    7 +
>   arch/arm/boot/dts/bcm-cygnus.dtsi                  |   30 +
>   arch/arm/mach-bcm/Kconfig                          |    1 +
>   drivers/gpio/Kconfig                               |   11 +
>   drivers/gpio/Makefile                              |    1 +
>   drivers/gpio/gpio-bcm-cygnus.c                     |  712 ++++++++++++++++++++
>   7 files changed, 847 insertions(+)
>   create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
>   create mode 100644 drivers/gpio/gpio-bcm-cygnus.c
>

[PATCH v2 0/5] Add gpio support to Broadcom Cygnus SoC

[Ray Jui]

Sorry. Please ignore this particular cover letter. It accidentally got 
sent along with other v3 patches.

On 12/8/2014 10:47 AM, Ray Jui wrote:
> This patchset contains the initial GPIO support for the Broadcom Cygnus SoC.
> Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
> and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
> the same Cygnus GPIO driver
>
> Changes from v1:
>   - Get rid of inline qualifier
>   - Get rid of redundant check in the ISR
>   - Other minor fixes to imrove code readability
>
> Ray Jui (5):
>    gpio: Cygnus: define Broadcom Cygnus GPIO binding
>    gpio: Cygnus: add GPIO driver
>    ARM: mach-bcm: Enable GPIO support for Cygnus
>    ARM: dts: enable GPIO for Broadcom Cygnus
>    MAINTAINERS: Entry for Cygnus GPIO driver
>
>   .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   85 +++
>   MAINTAINERS                                        |    7 +
>   arch/arm/boot/dts/bcm-cygnus.dtsi                  |   30 +
>   arch/arm/mach-bcm/Kconfig                          |    1 +
>   drivers/gpio/Kconfig                               |   11 +
>   drivers/gpio/Makefile                              |    1 +
>   drivers/gpio/gpio-bcm-cygnus.c                     |  712 ++++++++++++++++++++
>   7 files changed, 847 insertions(+)
>   create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
>   create mode 100644 drivers/gpio/gpio-bcm-cygnus.c
>

Re: [PATCH v3 1/5] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Arnd Bergmann]

On Monday 08 December 2014 10:47:44 Ray Jui wrote:
> +
> +- no-drv-stregnth:
> +    Specifies the GPIO controller does not support drive strength configuration
> +
> 

Typo:

	strength, not stregnth

Otherwise looks good.

	Arnd

[PATCH v3 1/5] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Arnd Bergmann]

On Monday 08 December 2014 10:47:44 Ray Jui wrote:
> +
> +- no-drv-stregnth:
> +    Specifies the GPIO controller does not support drive strength configuration
> +
> 

Typo:

	strength, not stregnth

Otherwise looks good.

	Arnd

Re: [PATCH v3 1/5] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

On 12/8/2014 11:38 AM, Arnd Bergmann wrote:
> On Monday 08 December 2014 10:47:44 Ray Jui wrote:
>> +
>> +- no-drv-stregnth:
>> +    Specifies the GPIO controller does not support drive strength configuration
>> +
>>
>
> Typo:
>
> 	strength, not stregnth
>
> Otherwise looks good.
>
> 	Arnd
>
Right...Let me fix that. Also noticed the following in the device tree 
binding example that needs to be fixed:
	gpio_crmu: gpio@03024800 {

		compatible = "brcm,cygnus-crmu-gpio";
The above line needs to be fixed with:
		compatible = "brcm,cygnus-gpio";

		reg = <0x03024800 0x50>;
		ngpios = <6>;
		#gpio-cells = <2>;
		gpio-controller;
		no-drv-stregnth;
	};

Re: [PATCH v3 1/5] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

On 12/8/2014 11:38 AM, Arnd Bergmann wrote:
> On Monday 08 December 2014 10:47:44 Ray Jui wrote:
>> +
>> +- no-drv-stregnth:
>> +    Specifies the GPIO controller does not support drive strength configuration
>> +
>>
>
> Typo:
>
> 	strength, not stregnth
>
> Otherwise looks good.
>
> 	Arnd
>
Right...Let me fix that. Also noticed the following in the device tree 
binding example that needs to be fixed:
	gpio_crmu: gpio@03024800 {

		compatible = "brcm,cygnus-crmu-gpio";
The above line needs to be fixed with:
		compatible = "brcm,cygnus-gpio";

		reg = <0x03024800 0x50>;
		ngpios = <6>;
		#gpio-cells = <2>;
		gpio-controller;
		no-drv-stregnth;
	};

[PATCH v3 1/5] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

On 12/8/2014 11:38 AM, Arnd Bergmann wrote:
> On Monday 08 December 2014 10:47:44 Ray Jui wrote:
>> +
>> +- no-drv-stregnth:
>> +    Specifies the GPIO controller does not support drive strength configuration
>> +
>>
>
> Typo:
>
> 	strength, not stregnth
>
> Otherwise looks good.
>
> 	Arnd
>
Right...Let me fix that. Also noticed the following in the device tree 
binding example that needs to be fixed:
	gpio_crmu: gpio at 03024800 {

		compatible = "brcm,cygnus-crmu-gpio";
The above line needs to be fixed with:
		compatible = "brcm,cygnus-gpio";

		reg = <0x03024800 0x50>;
		ngpios = <6>;
		#gpio-cells = <2>;
		gpio-controller;
		no-drv-stregnth;
	};

[PATCH v4 0/5] Add gpio support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial GPIO support for the Broadcom Cygnus SoC.
Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
the same Cygnus GPIO driver

Changes from v3:
 - Fix dt property tpyo
 - Fix incorrect GPIO compatible ID in device tree binding document example

Changes from v2:
 - Consolidate different compatible IDs into "brcm,cygnus-gpio"
 - Get rid of redundant "no-interrupt" property

Changes from v1:
 - Get rid of inline qualifier
 - Get rid of redundant check in the ISR
 - Other minor fixes to imrove code readability

Ray Jui (5):
  gpio: Cygnus: define Broadcom Cygnus GPIO binding
  gpio: Cygnus: add GPIO driver
  ARM: mach-bcm: Enable GPIO support for Cygnus
  ARM: dts: enable GPIO for Broadcom Cygnus
  MAINTAINERS: Entry for Cygnus GPIO driver

 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   82 +++
 MAINTAINERS                                        |    7 +
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   30 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/gpio/Kconfig                               |   11 +
 drivers/gpio/Makefile                              |    1 +
 drivers/gpio/gpio-bcm-cygnus.c                     |  705 ++++++++++++++++++++
 7 files changed, 837 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

-- 
1.7.9.5

[PATCH v4 0/5] Add gpio support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial GPIO support for the Broadcom Cygnus SoC.
Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
the same Cygnus GPIO driver

Changes from v3:
 - Fix dt property tpyo
 - Fix incorrect GPIO compatible ID in device tree binding document example

Changes from v2:
 - Consolidate different compatible IDs into "brcm,cygnus-gpio"
 - Get rid of redundant "no-interrupt" property

Changes from v1:
 - Get rid of inline qualifier
 - Get rid of redundant check in the ISR
 - Other minor fixes to imrove code readability

Ray Jui (5):
  gpio: Cygnus: define Broadcom Cygnus GPIO binding
  gpio: Cygnus: add GPIO driver
  ARM: mach-bcm: Enable GPIO support for Cygnus
  ARM: dts: enable GPIO for Broadcom Cygnus
  MAINTAINERS: Entry for Cygnus GPIO driver

 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   82 +++
 MAINTAINERS                                        |    7 +
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   30 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/gpio/Kconfig                               |   11 +
 drivers/gpio/Makefile                              |    1 +
 drivers/gpio/gpio-bcm-cygnus.c                     |  705 ++++++++++++++++++++
 7 files changed, 837 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

-- 
1.7.9.5

[PATCH v4 0/5] Add gpio support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial GPIO support for the Broadcom Cygnus SoC.
Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
the same Cygnus GPIO driver

Changes from v3:
 - Fix dt property tpyo
 - Fix incorrect GPIO compatible ID in device tree binding document example

Changes from v2:
 - Consolidate different compatible IDs into "brcm,cygnus-gpio"
 - Get rid of redundant "no-interrupt" property

Changes from v1:
 - Get rid of inline qualifier
 - Get rid of redundant check in the ISR
 - Other minor fixes to imrove code readability

Ray Jui (5):
  gpio: Cygnus: define Broadcom Cygnus GPIO binding
  gpio: Cygnus: add GPIO driver
  ARM: mach-bcm: Enable GPIO support for Cygnus
  ARM: dts: enable GPIO for Broadcom Cygnus
  MAINTAINERS: Entry for Cygnus GPIO driver

 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   82 +++
 MAINTAINERS                                        |    7 +
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   30 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/gpio/Kconfig                               |   11 +
 drivers/gpio/Makefile                              |    1 +
 drivers/gpio/gpio-bcm-cygnus.c                     |  705 ++++++++++++++++++++
 7 files changed, 837 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

-- 
1.7.9.5

[PATCH v4 1/5] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

Document the GPIO device tree binding for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   82 ++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt

diff --git a/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
new file mode 100644
index 0000000..dca322a
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
@@ -0,0 +1,82 @@
+Broadcom Cygnus GPIO Controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,cygnus-gpio"
+
+- reg:
+    Define the base and range of the I/O address space that contain the Cygnus
+GPIO controller registers
+
+- ngpios:
+    Total number of GPIOs the controller provides
+
+- #gpio-cells:
+    Must be two. The first cell is the GPIO pin number (within the
+controller's domain) and the second cell is used for the following:
+    bit[0]: polarity (0 for normal and 1 for inverted)
+    bit[18:16]: internal pull up/down: 0 - pull up/down disabled
+                                       1 - pull up enabled
+                                       2 - pull down enabled
+    bit[22:20]: drive strength: 0 - 2 mA
+                                1 - 4 mA
+                                2 - 6 mA
+                                3 - 8 mA
+                                4 - 10 mA
+                                5 - 12 mA
+                                6 - 14 mA
+                                7 - 16 mA
+
+- gpio-controller:
+    Specifies that the node is a GPIO controller
+
+Optional properties:
+
+- interrupt-controller:
+    Specifies that the node is an interrupt controller. Not all Cygnus GPIO
+interfaces support interrupt, e.g., the CRMU GPIO controller does not have its
+interrupt routed to the main processor's GIC
+
+- interrupts:
+    The interrupt outputs from the GPIO controller.
+
+- no-drv-strength:
+    Specifies the GPIO controller does not support drive strength configuration
+
+Example:
+	gpio_asiu: gpio@180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio@03024800 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-drv-strength;
+	};
+
+	/*
+	 * Touchscreen that uses the ASIU GPIO 100, with internal pull-up
+	 * enabled
+	 */
+	tsc {
+		...
+		...
+		gpio-event = <&gpio_asiu 100 0x10000>;
+	};
+
+	/* Bluetooth that uses the CRMU GPIO 2, with polarity inverted */
+	bluetooth {
+		...
+		...
+		bcm,rfkill-bank-sel = <&gpio_crmu 2 1>
+	}
-- 
1.7.9.5

[PATCH v4 1/5] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

Document the GPIO device tree binding for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   82 ++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt

diff --git a/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
new file mode 100644
index 0000000..dca322a
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
@@ -0,0 +1,82 @@
+Broadcom Cygnus GPIO Controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,cygnus-gpio"
+
+- reg:
+    Define the base and range of the I/O address space that contain the Cygnus
+GPIO controller registers
+
+- ngpios:
+    Total number of GPIOs the controller provides
+
+- #gpio-cells:
+    Must be two. The first cell is the GPIO pin number (within the
+controller's domain) and the second cell is used for the following:
+    bit[0]: polarity (0 for normal and 1 for inverted)
+    bit[18:16]: internal pull up/down: 0 - pull up/down disabled
+                                       1 - pull up enabled
+                                       2 - pull down enabled
+    bit[22:20]: drive strength: 0 - 2 mA
+                                1 - 4 mA
+                                2 - 6 mA
+                                3 - 8 mA
+                                4 - 10 mA
+                                5 - 12 mA
+                                6 - 14 mA
+                                7 - 16 mA
+
+- gpio-controller:
+    Specifies that the node is a GPIO controller
+
+Optional properties:
+
+- interrupt-controller:
+    Specifies that the node is an interrupt controller. Not all Cygnus GPIO
+interfaces support interrupt, e.g., the CRMU GPIO controller does not have its
+interrupt routed to the main processor's GIC
+
+- interrupts:
+    The interrupt outputs from the GPIO controller.
+
+- no-drv-strength:
+    Specifies the GPIO controller does not support drive strength configuration
+
+Example:
+	gpio_asiu: gpio@180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio@03024800 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-drv-strength;
+	};
+
+	/*
+	 * Touchscreen that uses the ASIU GPIO 100, with internal pull-up
+	 * enabled
+	 */
+	tsc {
+		...
+		...
+		gpio-event = <&gpio_asiu 100 0x10000>;
+	};
+
+	/* Bluetooth that uses the CRMU GPIO 2, with polarity inverted */
+	bluetooth {
+		...
+		...
+		bcm,rfkill-bank-sel = <&gpio_crmu 2 1>
+	}
-- 
1.7.9.5

[PATCH v4 1/5] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

Document the GPIO device tree binding for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   82 ++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt

diff --git a/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
new file mode 100644
index 0000000..dca322a
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
@@ -0,0 +1,82 @@
+Broadcom Cygnus GPIO Controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,cygnus-gpio"
+
+- reg:
+    Define the base and range of the I/O address space that contain the Cygnus
+GPIO controller registers
+
+- ngpios:
+    Total number of GPIOs the controller provides
+
+- #gpio-cells:
+    Must be two. The first cell is the GPIO pin number (within the
+controller's domain) and the second cell is used for the following:
+    bit[0]: polarity (0 for normal and 1 for inverted)
+    bit[18:16]: internal pull up/down: 0 - pull up/down disabled
+                                       1 - pull up enabled
+                                       2 - pull down enabled
+    bit[22:20]: drive strength: 0 - 2 mA
+                                1 - 4 mA
+                                2 - 6 mA
+                                3 - 8 mA
+                                4 - 10 mA
+                                5 - 12 mA
+                                6 - 14 mA
+                                7 - 16 mA
+
+- gpio-controller:
+    Specifies that the node is a GPIO controller
+
+Optional properties:
+
+- interrupt-controller:
+    Specifies that the node is an interrupt controller. Not all Cygnus GPIO
+interfaces support interrupt, e.g., the CRMU GPIO controller does not have its
+interrupt routed to the main processor's GIC
+
+- interrupts:
+    The interrupt outputs from the GPIO controller.
+
+- no-drv-strength:
+    Specifies the GPIO controller does not support drive strength configuration
+
+Example:
+	gpio_asiu: gpio at 180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio at 03024800 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-drv-strength;
+	};
+
+	/*
+	 * Touchscreen that uses the ASIU GPIO 100, with internal pull-up
+	 * enabled
+	 */
+	tsc {
+		...
+		...
+		gpio-event = <&gpio_asiu 100 0x10000>;
+	};
+
+	/* Bluetooth that uses the CRMU GPIO 2, with polarity inverted */
+	bluetooth {
+		...
+		...
+		bcm,rfkill-bank-sel = <&gpio_crmu 2 1>
+	}
-- 
1.7.9.5

[PATCH v4 2/5] gpio: Cygnus: add GPIO driver

[Ray Jui]

This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller, 2) the
chipCommonG GPIO controller, and 3) the ALWAYS-ON GPIO controller

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/gpio/Kconfig           |   11 +
 drivers/gpio/Makefile          |    1 +
 drivers/gpio/gpio-bcm-cygnus.c |  705 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 717 insertions(+)
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 633ec21..3e3b0342 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -126,6 +126,17 @@ config GPIO_74XX_MMIO
 	    8 bits:	74244 (Input), 74273 (Output)
 	    16 bits:	741624 (Input), 7416374 (Output)
 
+config GPIO_BCM_CYGNUS
+	bool "Broadcom Cygnus GPIO support"
+	depends on ARCH_BCM_CYGNUS && OF_GPIO
+	help
+	  Say yes here to turn on GPIO support for Broadcom Cygnus SoC
+
+	  The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
+	  GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
+	  the always-ON GPIO controller (CRMU). All 3 GPIO controllers are
+	  supported by this driver
+
 config GPIO_CLPS711X
 	tristate "CLPS711X GPIO support"
 	depends on ARCH_CLPS711X || COMPILE_TEST
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 81755f1..31eb7e0 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_GPIO_ADP5520)	+= gpio-adp5520.o
 obj-$(CONFIG_GPIO_ADP5588)	+= gpio-adp5588.o
 obj-$(CONFIG_GPIO_AMD8111)	+= gpio-amd8111.o
 obj-$(CONFIG_GPIO_ARIZONA)	+= gpio-arizona.o
+obj-$(CONFIG_GPIO_BCM_CYGNUS)	+= gpio-bcm-cygnus.o
 obj-$(CONFIG_GPIO_BCM_KONA)	+= gpio-bcm-kona.o
 obj-$(CONFIG_GPIO_BT8XX)	+= gpio-bt8xx.o
 obj-$(CONFIG_GPIO_CLPS711X)	+= gpio-clps711x.o
diff --git a/drivers/gpio/gpio-bcm-cygnus.c b/drivers/gpio/gpio-bcm-cygnus.c
new file mode 100644
index 0000000..4fd9b73
--- /dev/null
+++ b/drivers/gpio/gpio-bcm-cygnus.c
@@ -0,0 +1,705 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/ioport.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/irqchip/chained_irq.h>
+
+#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
+#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
+#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
+#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
+#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
+#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
+#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
+#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
+#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
+#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
+#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
+#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
+
+/* drive strength control for ASIU GPIO */
+#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
+
+/* drive strength control for CCM GPIO */
+#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00
+
+#define GPIO_BANK_SIZE 0x200
+#define NGPIOS_PER_BANK 32
+#define GPIO_BIT(pin) ((pin) % NGPIOS_PER_BANK)
+#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
+
+#define GPIO_FLAG_BIT_MASK           0xffff
+#define GPIO_PULL_BIT_SHIFT          16
+#define GPIO_PULL_BIT_MASK           0x3
+
+#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
+#define GPIO_DRV_STRENGTH_BITS       3
+#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
+
+/*
+ * For GPIO internal pull up/down registers
+ */
+enum gpio_pull {
+	GPIO_PULL_NONE = 0,
+	GPIO_PULL_UP,
+	GPIO_PULL_DOWN,
+	GPIO_PULL_INVALID,
+};
+
+/*
+ * GPIO drive strength
+ */
+enum gpio_drv_strength {
+	GPIO_DRV_STRENGTH_2MA = 0,
+	GPIO_DRV_STRENGTH_4MA,
+	GPIO_DRV_STRENGTH_6MA,
+	GPIO_DRV_STRENGTH_8MA,
+	GPIO_DRV_STRENGTH_10MA,
+	GPIO_DRV_STRENGTH_12MA,
+	GPIO_DRV_STRENGTH_14MA,
+	GPIO_DRV_STRENGTH_16MA,
+	GPIO_DRV_STRENGTH_INVALID,
+};
+
+struct bcm_cygnus_gpio {
+	struct device *dev;
+	void __iomem *base;
+	void __iomem *io_ctrl;
+	spinlock_t lock;
+	struct gpio_chip gc;
+	unsigned num_banks;
+	int irq;
+	struct irq_domain *irq_domain;
+};
+
+static unsigned int gpio_base_index;
+
+static struct bcm_cygnus_gpio *to_bcm_cygnus_gpio(struct gpio_chip *gc)
+{
+	return container_of(gc, struct bcm_cygnus_gpio, gc);
+}
+
+static int bcm_cygnus_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+
+	return irq_find_mapping(cygnus_gpio->irq_domain, offset);
+}
+
+static unsigned int __gpio_reg_offset(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio)
+{
+	return GPIO_BANK(gpio) * GPIO_BANK_SIZE;
+}
+
+static unsigned int __gpio_bitpos(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio)
+{
+	return GPIO_BIT(gpio);
+}
+
+static void bcm_cygnus_gpio_irq_handler(unsigned int irq,
+		struct irq_desc *desc)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio;
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	int i, bit;
+
+	chained_irq_enter(chip, desc);
+
+	cygnus_gpio = irq_get_handler_data(irq);
+
+	/* go through the entire GPIO banks and handle all interrupts */
+	for (i = 0; i < cygnus_gpio->num_banks; i++) {
+		unsigned long val = readl(cygnus_gpio->base +
+				(i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_MSTAT_OFFSET);
+
+		for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
+			unsigned pin = NGPIOS_PER_BANK * i + bit;
+			int child_irq =
+				bcm_cygnus_gpio_to_irq(&cygnus_gpio->gc, pin);
+
+			/*
+			 * Clear the interrupt before invoking the
+			 * handler, so we do not leave any window
+			 */
+			writel(1 << bit,
+				cygnus_gpio->base + (i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_CLR_OFFSET);
+
+			generic_handle_irq(child_irq);
+		}
+	}
+
+	chained_irq_exit(chip, desc);
+}
+
+static void bcm_cygnus_gpio_irq_ack(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_CLR_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static void bcm_cygnus_gpio_irq_mask(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_MSK_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static void bcm_cygnus_gpio_irq_unmask(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_MSK_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static int bcm_cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int int_type, dual_edge, edge_lvl;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	switch (type & IRQ_TYPE_SENSE_MASK) {
+	case IRQ_TYPE_EDGE_RISING:
+		int_type = 0;
+		dual_edge = 0;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_EDGE_FALLING:
+		int_type = 0;
+		dual_edge = 0;
+		edge_lvl = 0;
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		int_type = 0;
+		dual_edge = 1;
+		edge_lvl = 0;
+		break;
+
+	case IRQ_TYPE_LEVEL_HIGH:
+		int_type = 1;
+		dual_edge = 0;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_LOW:
+		int_type = 1;
+		dual_edge = 0;
+		edge_lvl = 0;
+		break;
+
+	default:
+		dev_err(cygnus_gpio->dev, "invalid GPIO irq type 0x%x\n", type);
+		return -EINVAL;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_IN_TYPE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= int_type << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_DE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= dual_edge << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_EDGE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= edge_lvl << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	return 0;
+}
+
+static struct irq_chip bcm_cygnus_gpio_irq_chip = {
+	.name = "bcm-cygnus-gpio",
+	.irq_ack = bcm_cygnus_gpio_irq_ack,
+	.irq_mask = bcm_cygnus_gpio_irq_mask,
+	.irq_unmask = bcm_cygnus_gpio_irq_unmask,
+	.irq_set_type = bcm_cygnus_gpio_irq_set_type,
+};
+
+static int bcm_cygnus_gpio_direction_input(struct gpio_chip *gc,
+		unsigned gpio)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_OUT_EN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+
+	return 0;
+}
+
+static int bcm_cygnus_gpio_direction_output(struct gpio_chip *gc,
+		unsigned gpio, int value)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_OUT_EN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_OUT_OFFSET;
+
+	val = readl(cygnus_gpio->base + offset);
+	if (value)
+		val |= 1 << shift;
+	else
+		val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+		"gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
+		gpio, offset, shift, val);
+
+	return 0;
+}
+
+static void bcm_cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio,
+		int value)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_OUT_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	if (value)
+		val |= 1 << shift;
+	else
+		val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+		"gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
+		gpio, offset, shift, val);
+}
+
+static int bcm_cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_IN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = readl(cygnus_gpio->base + offset);
+	val = (val >> shift) & 1;
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u val:%u\n",
+			gpio, offset, shift, val);
+
+	return val;
+}
+
+static struct lock_class_key gpio_lock_class;
+
+static int bcm_cygnus_gpio_irq_map(struct irq_domain *d, unsigned int irq,
+				 irq_hw_number_t hwirq)
+{
+	int ret;
+
+	ret = irq_set_chip_data(irq, d->host_data);
+	if (ret < 0)
+		return ret;
+	irq_set_lockdep_class(irq, &gpio_lock_class);
+	irq_set_chip_and_handler(irq, &bcm_cygnus_gpio_irq_chip,
+			handle_simple_irq);
+	set_irq_flags(irq, IRQF_VALID);
+
+	return 0;
+}
+
+static void bcm_cygnus_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
+{
+	irq_set_chip_and_handler(irq, NULL, NULL);
+	irq_set_chip_data(irq, NULL);
+}
+
+static struct irq_domain_ops bcm_cygnus_irq_ops = {
+	.map = bcm_cygnus_gpio_irq_map,
+	.unmap = bcm_cygnus_gpio_irq_unmap,
+	.xlate = irq_domain_xlate_twocell,
+};
+
+#ifdef CONFIG_OF_GPIO
+static void bcm_cygnus_gpio_set_pull(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio, enum gpio_pull pull)
+{
+	unsigned int offset, shift;
+	u32 val, pullup;
+	unsigned long flags;
+
+	switch (pull) {
+	case GPIO_PULL_UP:
+		pullup = 1;
+		break;
+	case GPIO_PULL_DOWN:
+		pullup = 0;
+		break;
+	case GPIO_PULL_NONE:
+	case GPIO_PULL_INVALID:
+	default:
+		return;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	/* set pull up/down */
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_PAD_RES_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	if (pullup)
+		val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	/* enable pad */
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_RES_EN_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static void bcm_cygnus_gpio_set_strength(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio, enum gpio_drv_strength strength)
+{
+	struct device *dev = cygnus_gpio->dev;
+	void __iomem *base;
+	unsigned int i, offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	/* some GPIO controllers do not support drive strength configuration */
+	if (of_find_property(dev->of_node, "no-drv-strength", NULL))
+		return;
+
+	if (cygnus_gpio->io_ctrl) {
+		base = cygnus_gpio->io_ctrl;
+		offset = CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET;
+	} else {
+		base = cygnus_gpio->base;
+		offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+			CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET;
+	}
+
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
+		val = readl(base + offset);
+		val &= ~(1 << shift);
+		val |= ((strength >> i) & 0x1) << shift;
+		writel(val, base + offset);
+		offset += 4;
+	}
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static int bcm_cygnus_gpio_of_xlate(struct gpio_chip *gc,
+		const struct of_phandle_args *gpiospec, u32 *flags)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	enum gpio_pull pull;
+	enum gpio_drv_strength strength;
+
+	if (gc->of_gpio_n_cells < 2)
+		return -EINVAL;
+
+	if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
+		return -EINVAL;
+
+	if (gpiospec->args[0] >= gc->ngpio)
+		return -EINVAL;
+
+	pull = (gpiospec->args[1] >> GPIO_PULL_BIT_SHIFT) & GPIO_PULL_BIT_MASK;
+	if (WARN_ON(pull >= GPIO_PULL_INVALID))
+		return -EINVAL;
+
+	strength = (gpiospec->args[1] >> GPIO_DRV_STRENGTH_BIT_SHIFT) &
+		GPIO_DRV_STRENGTH_BIT_MASK;
+
+	if (flags)
+		*flags = gpiospec->args[1] & GPIO_FLAG_BIT_MASK;
+
+	bcm_cygnus_gpio_set_pull(cygnus_gpio, gpiospec->args[0], pull);
+	bcm_cygnus_gpio_set_strength(cygnus_gpio, gpiospec->args[0], strength);
+
+	return gpiospec->args[0];
+}
+#endif
+
+static const struct of_device_id bcm_cygnus_gpio_of_match[] = {
+	{ .compatible = "brcm,cygnus-gpio" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, bcm_cygnus_gpio_of_match);
+
+static int bcm_cygnus_gpio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	const struct of_device_id *match;
+	struct resource *res;
+	struct bcm_cygnus_gpio *cygnus_gpio;
+	struct gpio_chip *gc;
+	u32 i, ngpios;
+	int ret;
+
+	match = of_match_device(bcm_cygnus_gpio_of_match, dev);
+	if (!match) {
+		dev_err(&pdev->dev, "failed to find GPIO controller\n");
+		return -ENODEV;
+	}
+
+	cygnus_gpio = devm_kzalloc(dev, sizeof(*cygnus_gpio), GFP_KERNEL);
+	if (!cygnus_gpio)
+		return -ENOMEM;
+
+	cygnus_gpio->dev = dev;
+	platform_set_drvdata(pdev, cygnus_gpio);
+
+	if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
+		dev_err(&pdev->dev, "missing ngpios device tree property\n");
+		return -ENODEV;
+	}
+	cygnus_gpio->num_banks = (ngpios + NGPIOS_PER_BANK - 1) /
+		NGPIOS_PER_BANK;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "unable to get I/O resource\n");
+		return -ENODEV;
+	}
+
+	cygnus_gpio->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(cygnus_gpio->base)) {
+		dev_err(&pdev->dev, "unable to map I/O memory\n");
+		return PTR_ERR(cygnus_gpio->base);
+	}
+
+	/*
+	 * Only certain types of Cygnus GPIO interfaces have I/O control
+	 * registers
+	 */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (res) {
+		cygnus_gpio->io_ctrl = devm_ioremap_resource(dev, res);
+		if (IS_ERR(cygnus_gpio->io_ctrl)) {
+			dev_err(&pdev->dev, "unable to map I/O memory\n");
+			return PTR_ERR(cygnus_gpio->io_ctrl);
+		}
+	}
+
+	spin_lock_init(&cygnus_gpio->lock);
+
+	gc = &cygnus_gpio->gc;
+	gc->base = gpio_base_index;
+	gpio_base_index += ngpios;
+	gc->ngpio = ngpios;
+	gc->label = dev_name(dev);
+	gc->dev = dev;
+#ifdef CONFIG_OF_GPIO
+	gc->of_node = dev->of_node;
+	gc->of_gpio_n_cells = 2;
+	gc->of_xlate = bcm_cygnus_gpio_of_xlate;
+#endif
+	gc->direction_input = bcm_cygnus_gpio_direction_input;
+	gc->direction_output = bcm_cygnus_gpio_direction_output;
+	gc->set = bcm_cygnus_gpio_set;
+	gc->get = bcm_cygnus_gpio_get;
+	gc->to_irq = bcm_cygnus_gpio_to_irq;
+
+	ret = gpiochip_add(gc);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "unable to add GPIO chip\n");
+		goto err_dec_gpio_base;
+	}
+
+	/*
+	 * Some of the GPIO interfaces do not have interrupt wired to the main
+	 * processor
+	 */
+	cygnus_gpio->irq = platform_get_irq(pdev, 0);
+	if (cygnus_gpio->irq < 0) {
+		ret = cygnus_gpio->irq;
+		if (ret == -EPROBE_DEFER)
+			goto err_rm_gpiochip;
+
+		dev_info(&pdev->dev, "no interrupt hook\n");
+	}
+
+	cygnus_gpio->irq_domain = irq_domain_add_linear(dev->of_node,
+			gc->ngpio, &bcm_cygnus_irq_ops, cygnus_gpio);
+	if (!cygnus_gpio->irq_domain) {
+		dev_err(&pdev->dev, "unable to allocate IRQ domain\n");
+		ret = -ENXIO;
+		goto err_rm_gpiochip;
+	}
+
+	for (i = 0; i < gc->ngpio; i++) {
+		int irq = irq_create_mapping(cygnus_gpio->irq_domain, i);
+
+		irq_set_lockdep_class(irq, &gpio_lock_class);
+		irq_set_chip_data(irq, cygnus_gpio);
+		irq_set_chip_and_handler(irq, &bcm_cygnus_gpio_irq_chip,
+				handle_simple_irq);
+		set_irq_flags(irq, IRQF_VALID);
+	}
+
+	irq_set_chained_handler(cygnus_gpio->irq, bcm_cygnus_gpio_irq_handler);
+	irq_set_handler_data(cygnus_gpio->irq, cygnus_gpio);
+
+	return 0;
+
+err_rm_gpiochip:
+	gpiochip_remove(gc);
+
+err_dec_gpio_base:
+	gpio_base_index -= ngpios;
+	return ret;
+}
+
+static struct platform_driver bcm_cygnus_gpio_driver = {
+	.driver = {
+		.name = "bcm-cygnus-gpio",
+		.owner = THIS_MODULE,
+		.of_match_table = bcm_cygnus_gpio_of_match,
+	},
+	.probe = bcm_cygnus_gpio_probe,
+};
+
+module_platform_driver(bcm_cygnus_gpio_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus GPIO Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v4 2/5] gpio: Cygnus: add GPIO driver

[Ray Jui]

This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller, 2) the
chipCommonG GPIO controller, and 3) the ALWAYS-ON GPIO controller

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/gpio/Kconfig           |   11 +
 drivers/gpio/Makefile          |    1 +
 drivers/gpio/gpio-bcm-cygnus.c |  705 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 717 insertions(+)
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 633ec21..3e3b0342 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -126,6 +126,17 @@ config GPIO_74XX_MMIO
 	    8 bits:	74244 (Input), 74273 (Output)
 	    16 bits:	741624 (Input), 7416374 (Output)
 
+config GPIO_BCM_CYGNUS
+	bool "Broadcom Cygnus GPIO support"
+	depends on ARCH_BCM_CYGNUS && OF_GPIO
+	help
+	  Say yes here to turn on GPIO support for Broadcom Cygnus SoC
+
+	  The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
+	  GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
+	  the always-ON GPIO controller (CRMU). All 3 GPIO controllers are
+	  supported by this driver
+
 config GPIO_CLPS711X
 	tristate "CLPS711X GPIO support"
 	depends on ARCH_CLPS711X || COMPILE_TEST
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 81755f1..31eb7e0 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_GPIO_ADP5520)	+= gpio-adp5520.o
 obj-$(CONFIG_GPIO_ADP5588)	+= gpio-adp5588.o
 obj-$(CONFIG_GPIO_AMD8111)	+= gpio-amd8111.o
 obj-$(CONFIG_GPIO_ARIZONA)	+= gpio-arizona.o
+obj-$(CONFIG_GPIO_BCM_CYGNUS)	+= gpio-bcm-cygnus.o
 obj-$(CONFIG_GPIO_BCM_KONA)	+= gpio-bcm-kona.o
 obj-$(CONFIG_GPIO_BT8XX)	+= gpio-bt8xx.o
 obj-$(CONFIG_GPIO_CLPS711X)	+= gpio-clps711x.o
diff --git a/drivers/gpio/gpio-bcm-cygnus.c b/drivers/gpio/gpio-bcm-cygnus.c
new file mode 100644
index 0000000..4fd9b73
--- /dev/null
+++ b/drivers/gpio/gpio-bcm-cygnus.c
@@ -0,0 +1,705 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/ioport.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/irqchip/chained_irq.h>
+
+#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
+#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
+#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
+#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
+#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
+#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
+#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
+#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
+#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
+#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
+#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
+#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
+
+/* drive strength control for ASIU GPIO */
+#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
+
+/* drive strength control for CCM GPIO */
+#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00
+
+#define GPIO_BANK_SIZE 0x200
+#define NGPIOS_PER_BANK 32
+#define GPIO_BIT(pin) ((pin) % NGPIOS_PER_BANK)
+#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
+
+#define GPIO_FLAG_BIT_MASK           0xffff
+#define GPIO_PULL_BIT_SHIFT          16
+#define GPIO_PULL_BIT_MASK           0x3
+
+#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
+#define GPIO_DRV_STRENGTH_BITS       3
+#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
+
+/*
+ * For GPIO internal pull up/down registers
+ */
+enum gpio_pull {
+	GPIO_PULL_NONE = 0,
+	GPIO_PULL_UP,
+	GPIO_PULL_DOWN,
+	GPIO_PULL_INVALID,
+};
+
+/*
+ * GPIO drive strength
+ */
+enum gpio_drv_strength {
+	GPIO_DRV_STRENGTH_2MA = 0,
+	GPIO_DRV_STRENGTH_4MA,
+	GPIO_DRV_STRENGTH_6MA,
+	GPIO_DRV_STRENGTH_8MA,
+	GPIO_DRV_STRENGTH_10MA,
+	GPIO_DRV_STRENGTH_12MA,
+	GPIO_DRV_STRENGTH_14MA,
+	GPIO_DRV_STRENGTH_16MA,
+	GPIO_DRV_STRENGTH_INVALID,
+};
+
+struct bcm_cygnus_gpio {
+	struct device *dev;
+	void __iomem *base;
+	void __iomem *io_ctrl;
+	spinlock_t lock;
+	struct gpio_chip gc;
+	unsigned num_banks;
+	int irq;
+	struct irq_domain *irq_domain;
+};
+
+static unsigned int gpio_base_index;
+
+static struct bcm_cygnus_gpio *to_bcm_cygnus_gpio(struct gpio_chip *gc)
+{
+	return container_of(gc, struct bcm_cygnus_gpio, gc);
+}
+
+static int bcm_cygnus_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+
+	return irq_find_mapping(cygnus_gpio->irq_domain, offset);
+}
+
+static unsigned int __gpio_reg_offset(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio)
+{
+	return GPIO_BANK(gpio) * GPIO_BANK_SIZE;
+}
+
+static unsigned int __gpio_bitpos(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio)
+{
+	return GPIO_BIT(gpio);
+}
+
+static void bcm_cygnus_gpio_irq_handler(unsigned int irq,
+		struct irq_desc *desc)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio;
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	int i, bit;
+
+	chained_irq_enter(chip, desc);
+
+	cygnus_gpio = irq_get_handler_data(irq);
+
+	/* go through the entire GPIO banks and handle all interrupts */
+	for (i = 0; i < cygnus_gpio->num_banks; i++) {
+		unsigned long val = readl(cygnus_gpio->base +
+				(i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_MSTAT_OFFSET);
+
+		for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
+			unsigned pin = NGPIOS_PER_BANK * i + bit;
+			int child_irq =
+				bcm_cygnus_gpio_to_irq(&cygnus_gpio->gc, pin);
+
+			/*
+			 * Clear the interrupt before invoking the
+			 * handler, so we do not leave any window
+			 */
+			writel(1 << bit,
+				cygnus_gpio->base + (i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_CLR_OFFSET);
+
+			generic_handle_irq(child_irq);
+		}
+	}
+
+	chained_irq_exit(chip, desc);
+}
+
+static void bcm_cygnus_gpio_irq_ack(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_CLR_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static void bcm_cygnus_gpio_irq_mask(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_MSK_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static void bcm_cygnus_gpio_irq_unmask(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_MSK_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static int bcm_cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int int_type, dual_edge, edge_lvl;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	switch (type & IRQ_TYPE_SENSE_MASK) {
+	case IRQ_TYPE_EDGE_RISING:
+		int_type = 0;
+		dual_edge = 0;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_EDGE_FALLING:
+		int_type = 0;
+		dual_edge = 0;
+		edge_lvl = 0;
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		int_type = 0;
+		dual_edge = 1;
+		edge_lvl = 0;
+		break;
+
+	case IRQ_TYPE_LEVEL_HIGH:
+		int_type = 1;
+		dual_edge = 0;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_LOW:
+		int_type = 1;
+		dual_edge = 0;
+		edge_lvl = 0;
+		break;
+
+	default:
+		dev_err(cygnus_gpio->dev, "invalid GPIO irq type 0x%x\n", type);
+		return -EINVAL;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_IN_TYPE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= int_type << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_DE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= dual_edge << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_EDGE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= edge_lvl << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	return 0;
+}
+
+static struct irq_chip bcm_cygnus_gpio_irq_chip = {
+	.name = "bcm-cygnus-gpio",
+	.irq_ack = bcm_cygnus_gpio_irq_ack,
+	.irq_mask = bcm_cygnus_gpio_irq_mask,
+	.irq_unmask = bcm_cygnus_gpio_irq_unmask,
+	.irq_set_type = bcm_cygnus_gpio_irq_set_type,
+};
+
+static int bcm_cygnus_gpio_direction_input(struct gpio_chip *gc,
+		unsigned gpio)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_OUT_EN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+
+	return 0;
+}
+
+static int bcm_cygnus_gpio_direction_output(struct gpio_chip *gc,
+		unsigned gpio, int value)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_OUT_EN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_OUT_OFFSET;
+
+	val = readl(cygnus_gpio->base + offset);
+	if (value)
+		val |= 1 << shift;
+	else
+		val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+		"gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
+		gpio, offset, shift, val);
+
+	return 0;
+}
+
+static void bcm_cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio,
+		int value)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_OUT_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	if (value)
+		val |= 1 << shift;
+	else
+		val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+		"gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
+		gpio, offset, shift, val);
+}
+
+static int bcm_cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_IN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = readl(cygnus_gpio->base + offset);
+	val = (val >> shift) & 1;
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u val:%u\n",
+			gpio, offset, shift, val);
+
+	return val;
+}
+
+static struct lock_class_key gpio_lock_class;
+
+static int bcm_cygnus_gpio_irq_map(struct irq_domain *d, unsigned int irq,
+				 irq_hw_number_t hwirq)
+{
+	int ret;
+
+	ret = irq_set_chip_data(irq, d->host_data);
+	if (ret < 0)
+		return ret;
+	irq_set_lockdep_class(irq, &gpio_lock_class);
+	irq_set_chip_and_handler(irq, &bcm_cygnus_gpio_irq_chip,
+			handle_simple_irq);
+	set_irq_flags(irq, IRQF_VALID);
+
+	return 0;
+}
+
+static void bcm_cygnus_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
+{
+	irq_set_chip_and_handler(irq, NULL, NULL);
+	irq_set_chip_data(irq, NULL);
+}
+
+static struct irq_domain_ops bcm_cygnus_irq_ops = {
+	.map = bcm_cygnus_gpio_irq_map,
+	.unmap = bcm_cygnus_gpio_irq_unmap,
+	.xlate = irq_domain_xlate_twocell,
+};
+
+#ifdef CONFIG_OF_GPIO
+static void bcm_cygnus_gpio_set_pull(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio, enum gpio_pull pull)
+{
+	unsigned int offset, shift;
+	u32 val, pullup;
+	unsigned long flags;
+
+	switch (pull) {
+	case GPIO_PULL_UP:
+		pullup = 1;
+		break;
+	case GPIO_PULL_DOWN:
+		pullup = 0;
+		break;
+	case GPIO_PULL_NONE:
+	case GPIO_PULL_INVALID:
+	default:
+		return;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	/* set pull up/down */
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_PAD_RES_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	if (pullup)
+		val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	/* enable pad */
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_RES_EN_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static void bcm_cygnus_gpio_set_strength(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio, enum gpio_drv_strength strength)
+{
+	struct device *dev = cygnus_gpio->dev;
+	void __iomem *base;
+	unsigned int i, offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	/* some GPIO controllers do not support drive strength configuration */
+	if (of_find_property(dev->of_node, "no-drv-strength", NULL))
+		return;
+
+	if (cygnus_gpio->io_ctrl) {
+		base = cygnus_gpio->io_ctrl;
+		offset = CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET;
+	} else {
+		base = cygnus_gpio->base;
+		offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+			CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET;
+	}
+
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
+		val = readl(base + offset);
+		val &= ~(1 << shift);
+		val |= ((strength >> i) & 0x1) << shift;
+		writel(val, base + offset);
+		offset += 4;
+	}
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static int bcm_cygnus_gpio_of_xlate(struct gpio_chip *gc,
+		const struct of_phandle_args *gpiospec, u32 *flags)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	enum gpio_pull pull;
+	enum gpio_drv_strength strength;
+
+	if (gc->of_gpio_n_cells < 2)
+		return -EINVAL;
+
+	if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
+		return -EINVAL;
+
+	if (gpiospec->args[0] >= gc->ngpio)
+		return -EINVAL;
+
+	pull = (gpiospec->args[1] >> GPIO_PULL_BIT_SHIFT) & GPIO_PULL_BIT_MASK;
+	if (WARN_ON(pull >= GPIO_PULL_INVALID))
+		return -EINVAL;
+
+	strength = (gpiospec->args[1] >> GPIO_DRV_STRENGTH_BIT_SHIFT) &
+		GPIO_DRV_STRENGTH_BIT_MASK;
+
+	if (flags)
+		*flags = gpiospec->args[1] & GPIO_FLAG_BIT_MASK;
+
+	bcm_cygnus_gpio_set_pull(cygnus_gpio, gpiospec->args[0], pull);
+	bcm_cygnus_gpio_set_strength(cygnus_gpio, gpiospec->args[0], strength);
+
+	return gpiospec->args[0];
+}
+#endif
+
+static const struct of_device_id bcm_cygnus_gpio_of_match[] = {
+	{ .compatible = "brcm,cygnus-gpio" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, bcm_cygnus_gpio_of_match);
+
+static int bcm_cygnus_gpio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	const struct of_device_id *match;
+	struct resource *res;
+	struct bcm_cygnus_gpio *cygnus_gpio;
+	struct gpio_chip *gc;
+	u32 i, ngpios;
+	int ret;
+
+	match = of_match_device(bcm_cygnus_gpio_of_match, dev);
+	if (!match) {
+		dev_err(&pdev->dev, "failed to find GPIO controller\n");
+		return -ENODEV;
+	}
+
+	cygnus_gpio = devm_kzalloc(dev, sizeof(*cygnus_gpio), GFP_KERNEL);
+	if (!cygnus_gpio)
+		return -ENOMEM;
+
+	cygnus_gpio->dev = dev;
+	platform_set_drvdata(pdev, cygnus_gpio);
+
+	if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
+		dev_err(&pdev->dev, "missing ngpios device tree property\n");
+		return -ENODEV;
+	}
+	cygnus_gpio->num_banks = (ngpios + NGPIOS_PER_BANK - 1) /
+		NGPIOS_PER_BANK;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "unable to get I/O resource\n");
+		return -ENODEV;
+	}
+
+	cygnus_gpio->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(cygnus_gpio->base)) {
+		dev_err(&pdev->dev, "unable to map I/O memory\n");
+		return PTR_ERR(cygnus_gpio->base);
+	}
+
+	/*
+	 * Only certain types of Cygnus GPIO interfaces have I/O control
+	 * registers
+	 */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (res) {
+		cygnus_gpio->io_ctrl = devm_ioremap_resource(dev, res);
+		if (IS_ERR(cygnus_gpio->io_ctrl)) {
+			dev_err(&pdev->dev, "unable to map I/O memory\n");
+			return PTR_ERR(cygnus_gpio->io_ctrl);
+		}
+	}
+
+	spin_lock_init(&cygnus_gpio->lock);
+
+	gc = &cygnus_gpio->gc;
+	gc->base = gpio_base_index;
+	gpio_base_index += ngpios;
+	gc->ngpio = ngpios;
+	gc->label = dev_name(dev);
+	gc->dev = dev;
+#ifdef CONFIG_OF_GPIO
+	gc->of_node = dev->of_node;
+	gc->of_gpio_n_cells = 2;
+	gc->of_xlate = bcm_cygnus_gpio_of_xlate;
+#endif
+	gc->direction_input = bcm_cygnus_gpio_direction_input;
+	gc->direction_output = bcm_cygnus_gpio_direction_output;
+	gc->set = bcm_cygnus_gpio_set;
+	gc->get = bcm_cygnus_gpio_get;
+	gc->to_irq = bcm_cygnus_gpio_to_irq;
+
+	ret = gpiochip_add(gc);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "unable to add GPIO chip\n");
+		goto err_dec_gpio_base;
+	}
+
+	/*
+	 * Some of the GPIO interfaces do not have interrupt wired to the main
+	 * processor
+	 */
+	cygnus_gpio->irq = platform_get_irq(pdev, 0);
+	if (cygnus_gpio->irq < 0) {
+		ret = cygnus_gpio->irq;
+		if (ret == -EPROBE_DEFER)
+			goto err_rm_gpiochip;
+
+		dev_info(&pdev->dev, "no interrupt hook\n");
+	}
+
+	cygnus_gpio->irq_domain = irq_domain_add_linear(dev->of_node,
+			gc->ngpio, &bcm_cygnus_irq_ops, cygnus_gpio);
+	if (!cygnus_gpio->irq_domain) {
+		dev_err(&pdev->dev, "unable to allocate IRQ domain\n");
+		ret = -ENXIO;
+		goto err_rm_gpiochip;
+	}
+
+	for (i = 0; i < gc->ngpio; i++) {
+		int irq = irq_create_mapping(cygnus_gpio->irq_domain, i);
+
+		irq_set_lockdep_class(irq, &gpio_lock_class);
+		irq_set_chip_data(irq, cygnus_gpio);
+		irq_set_chip_and_handler(irq, &bcm_cygnus_gpio_irq_chip,
+				handle_simple_irq);
+		set_irq_flags(irq, IRQF_VALID);
+	}
+
+	irq_set_chained_handler(cygnus_gpio->irq, bcm_cygnus_gpio_irq_handler);
+	irq_set_handler_data(cygnus_gpio->irq, cygnus_gpio);
+
+	return 0;
+
+err_rm_gpiochip:
+	gpiochip_remove(gc);
+
+err_dec_gpio_base:
+	gpio_base_index -= ngpios;
+	return ret;
+}
+
+static struct platform_driver bcm_cygnus_gpio_driver = {
+	.driver = {
+		.name = "bcm-cygnus-gpio",
+		.owner = THIS_MODULE,
+		.of_match_table = bcm_cygnus_gpio_of_match,
+	},
+	.probe = bcm_cygnus_gpio_probe,
+};
+
+module_platform_driver(bcm_cygnus_gpio_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus GPIO Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v4 2/5] gpio: Cygnus: add GPIO driver

[Ray Jui]

This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller, 2) the
chipCommonG GPIO controller, and 3) the ALWAYS-ON GPIO controller

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/gpio/Kconfig           |   11 +
 drivers/gpio/Makefile          |    1 +
 drivers/gpio/gpio-bcm-cygnus.c |  705 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 717 insertions(+)
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 633ec21..3e3b0342 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -126,6 +126,17 @@ config GPIO_74XX_MMIO
 	    8 bits:	74244 (Input), 74273 (Output)
 	    16 bits:	741624 (Input), 7416374 (Output)
 
+config GPIO_BCM_CYGNUS
+	bool "Broadcom Cygnus GPIO support"
+	depends on ARCH_BCM_CYGNUS && OF_GPIO
+	help
+	  Say yes here to turn on GPIO support for Broadcom Cygnus SoC
+
+	  The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
+	  GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
+	  the always-ON GPIO controller (CRMU). All 3 GPIO controllers are
+	  supported by this driver
+
 config GPIO_CLPS711X
 	tristate "CLPS711X GPIO support"
 	depends on ARCH_CLPS711X || COMPILE_TEST
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 81755f1..31eb7e0 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_GPIO_ADP5520)	+= gpio-adp5520.o
 obj-$(CONFIG_GPIO_ADP5588)	+= gpio-adp5588.o
 obj-$(CONFIG_GPIO_AMD8111)	+= gpio-amd8111.o
 obj-$(CONFIG_GPIO_ARIZONA)	+= gpio-arizona.o
+obj-$(CONFIG_GPIO_BCM_CYGNUS)	+= gpio-bcm-cygnus.o
 obj-$(CONFIG_GPIO_BCM_KONA)	+= gpio-bcm-kona.o
 obj-$(CONFIG_GPIO_BT8XX)	+= gpio-bt8xx.o
 obj-$(CONFIG_GPIO_CLPS711X)	+= gpio-clps711x.o
diff --git a/drivers/gpio/gpio-bcm-cygnus.c b/drivers/gpio/gpio-bcm-cygnus.c
new file mode 100644
index 0000000..4fd9b73
--- /dev/null
+++ b/drivers/gpio/gpio-bcm-cygnus.c
@@ -0,0 +1,705 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/ioport.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/irqchip/chained_irq.h>
+
+#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
+#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
+#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
+#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
+#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
+#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
+#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
+#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
+#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
+#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
+#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
+#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
+
+/* drive strength control for ASIU GPIO */
+#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
+
+/* drive strength control for CCM GPIO */
+#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00
+
+#define GPIO_BANK_SIZE 0x200
+#define NGPIOS_PER_BANK 32
+#define GPIO_BIT(pin) ((pin) % NGPIOS_PER_BANK)
+#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
+
+#define GPIO_FLAG_BIT_MASK           0xffff
+#define GPIO_PULL_BIT_SHIFT          16
+#define GPIO_PULL_BIT_MASK           0x3
+
+#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
+#define GPIO_DRV_STRENGTH_BITS       3
+#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
+
+/*
+ * For GPIO internal pull up/down registers
+ */
+enum gpio_pull {
+	GPIO_PULL_NONE = 0,
+	GPIO_PULL_UP,
+	GPIO_PULL_DOWN,
+	GPIO_PULL_INVALID,
+};
+
+/*
+ * GPIO drive strength
+ */
+enum gpio_drv_strength {
+	GPIO_DRV_STRENGTH_2MA = 0,
+	GPIO_DRV_STRENGTH_4MA,
+	GPIO_DRV_STRENGTH_6MA,
+	GPIO_DRV_STRENGTH_8MA,
+	GPIO_DRV_STRENGTH_10MA,
+	GPIO_DRV_STRENGTH_12MA,
+	GPIO_DRV_STRENGTH_14MA,
+	GPIO_DRV_STRENGTH_16MA,
+	GPIO_DRV_STRENGTH_INVALID,
+};
+
+struct bcm_cygnus_gpio {
+	struct device *dev;
+	void __iomem *base;
+	void __iomem *io_ctrl;
+	spinlock_t lock;
+	struct gpio_chip gc;
+	unsigned num_banks;
+	int irq;
+	struct irq_domain *irq_domain;
+};
+
+static unsigned int gpio_base_index;
+
+static struct bcm_cygnus_gpio *to_bcm_cygnus_gpio(struct gpio_chip *gc)
+{
+	return container_of(gc, struct bcm_cygnus_gpio, gc);
+}
+
+static int bcm_cygnus_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+
+	return irq_find_mapping(cygnus_gpio->irq_domain, offset);
+}
+
+static unsigned int __gpio_reg_offset(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio)
+{
+	return GPIO_BANK(gpio) * GPIO_BANK_SIZE;
+}
+
+static unsigned int __gpio_bitpos(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio)
+{
+	return GPIO_BIT(gpio);
+}
+
+static void bcm_cygnus_gpio_irq_handler(unsigned int irq,
+		struct irq_desc *desc)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio;
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	int i, bit;
+
+	chained_irq_enter(chip, desc);
+
+	cygnus_gpio = irq_get_handler_data(irq);
+
+	/* go through the entire GPIO banks and handle all interrupts */
+	for (i = 0; i < cygnus_gpio->num_banks; i++) {
+		unsigned long val = readl(cygnus_gpio->base +
+				(i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_MSTAT_OFFSET);
+
+		for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
+			unsigned pin = NGPIOS_PER_BANK * i + bit;
+			int child_irq =
+				bcm_cygnus_gpio_to_irq(&cygnus_gpio->gc, pin);
+
+			/*
+			 * Clear the interrupt before invoking the
+			 * handler, so we do not leave any window
+			 */
+			writel(1 << bit,
+				cygnus_gpio->base + (i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_CLR_OFFSET);
+
+			generic_handle_irq(child_irq);
+		}
+	}
+
+	chained_irq_exit(chip, desc);
+}
+
+static void bcm_cygnus_gpio_irq_ack(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_CLR_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static void bcm_cygnus_gpio_irq_mask(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_MSK_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static void bcm_cygnus_gpio_irq_unmask(struct irq_data *d)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_MSK_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+}
+
+static int bcm_cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int int_type, dual_edge, edge_lvl;
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	switch (type & IRQ_TYPE_SENSE_MASK) {
+	case IRQ_TYPE_EDGE_RISING:
+		int_type = 0;
+		dual_edge = 0;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_EDGE_FALLING:
+		int_type = 0;
+		dual_edge = 0;
+		edge_lvl = 0;
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		int_type = 0;
+		dual_edge = 1;
+		edge_lvl = 0;
+		break;
+
+	case IRQ_TYPE_LEVEL_HIGH:
+		int_type = 1;
+		dual_edge = 0;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_LOW:
+		int_type = 1;
+		dual_edge = 0;
+		edge_lvl = 0;
+		break;
+
+	default:
+		dev_err(cygnus_gpio->dev, "invalid GPIO irq type 0x%x\n", type);
+		return -EINVAL;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_IN_TYPE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= int_type << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_DE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= dual_edge << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_INT_EDGE_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	val |= edge_lvl << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	return 0;
+}
+
+static struct irq_chip bcm_cygnus_gpio_irq_chip = {
+	.name = "bcm-cygnus-gpio",
+	.irq_ack = bcm_cygnus_gpio_irq_ack,
+	.irq_mask = bcm_cygnus_gpio_irq_mask,
+	.irq_unmask = bcm_cygnus_gpio_irq_unmask,
+	.irq_set_type = bcm_cygnus_gpio_irq_set_type,
+};
+
+static int bcm_cygnus_gpio_direction_input(struct gpio_chip *gc,
+		unsigned gpio)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_OUT_EN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+
+	return 0;
+}
+
+static int bcm_cygnus_gpio_direction_output(struct gpio_chip *gc,
+		unsigned gpio, int value)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_OUT_EN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
+			offset, shift);
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_OUT_OFFSET;
+
+	val = readl(cygnus_gpio->base + offset);
+	if (value)
+		val |= 1 << shift;
+	else
+		val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+		"gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
+		gpio, offset, shift, val);
+
+	return 0;
+}
+
+static void bcm_cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio,
+		int value)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_OUT_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	val = readl(cygnus_gpio->base + offset);
+	if (value)
+		val |= 1 << shift;
+	else
+		val &= ~(1 << shift);
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+		"gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
+		gpio, offset, shift, val);
+}
+
+static int bcm_cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	unsigned int offset, shift;
+	u32 val;
+
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_DATA_IN_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = readl(cygnus_gpio->base + offset);
+	val = (val >> shift) & 1;
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u val:%u\n",
+			gpio, offset, shift, val);
+
+	return val;
+}
+
+static struct lock_class_key gpio_lock_class;
+
+static int bcm_cygnus_gpio_irq_map(struct irq_domain *d, unsigned int irq,
+				 irq_hw_number_t hwirq)
+{
+	int ret;
+
+	ret = irq_set_chip_data(irq, d->host_data);
+	if (ret < 0)
+		return ret;
+	irq_set_lockdep_class(irq, &gpio_lock_class);
+	irq_set_chip_and_handler(irq, &bcm_cygnus_gpio_irq_chip,
+			handle_simple_irq);
+	set_irq_flags(irq, IRQF_VALID);
+
+	return 0;
+}
+
+static void bcm_cygnus_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
+{
+	irq_set_chip_and_handler(irq, NULL, NULL);
+	irq_set_chip_data(irq, NULL);
+}
+
+static struct irq_domain_ops bcm_cygnus_irq_ops = {
+	.map = bcm_cygnus_gpio_irq_map,
+	.unmap = bcm_cygnus_gpio_irq_unmap,
+	.xlate = irq_domain_xlate_twocell,
+};
+
+#ifdef CONFIG_OF_GPIO
+static void bcm_cygnus_gpio_set_pull(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio, enum gpio_pull pull)
+{
+	unsigned int offset, shift;
+	u32 val, pullup;
+	unsigned long flags;
+
+	switch (pull) {
+	case GPIO_PULL_UP:
+		pullup = 1;
+		break;
+	case GPIO_PULL_DOWN:
+		pullup = 0;
+		break;
+	case GPIO_PULL_NONE:
+	case GPIO_PULL_INVALID:
+	default:
+		return;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	/* set pull up/down */
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_PAD_RES_OFFSET;
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	val = readl(cygnus_gpio->base + offset);
+	val &= ~(1 << shift);
+	if (pullup)
+		val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	/* enable pad */
+	offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+		CYGNUS_GPIO_RES_EN_OFFSET;
+	val = readl(cygnus_gpio->base + offset);
+	val |= 1 << shift;
+	writel(val, cygnus_gpio->base + offset);
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static void bcm_cygnus_gpio_set_strength(struct bcm_cygnus_gpio *cygnus_gpio,
+		unsigned gpio, enum gpio_drv_strength strength)
+{
+	struct device *dev = cygnus_gpio->dev;
+	void __iomem *base;
+	unsigned int i, offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	/* some GPIO controllers do not support drive strength configuration */
+	if (of_find_property(dev->of_node, "no-drv-strength", NULL))
+		return;
+
+	if (cygnus_gpio->io_ctrl) {
+		base = cygnus_gpio->io_ctrl;
+		offset = CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET;
+	} else {
+		base = cygnus_gpio->base;
+		offset = __gpio_reg_offset(cygnus_gpio, gpio) +
+			CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET;
+	}
+
+	shift = __gpio_bitpos(cygnus_gpio, gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
+		val = readl(base + offset);
+		val &= ~(1 << shift);
+		val |= ((strength >> i) & 0x1) << shift;
+		writel(val, base + offset);
+		offset += 4;
+	}
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static int bcm_cygnus_gpio_of_xlate(struct gpio_chip *gc,
+		const struct of_phandle_args *gpiospec, u32 *flags)
+{
+	struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
+	enum gpio_pull pull;
+	enum gpio_drv_strength strength;
+
+	if (gc->of_gpio_n_cells < 2)
+		return -EINVAL;
+
+	if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
+		return -EINVAL;
+
+	if (gpiospec->args[0] >= gc->ngpio)
+		return -EINVAL;
+
+	pull = (gpiospec->args[1] >> GPIO_PULL_BIT_SHIFT) & GPIO_PULL_BIT_MASK;
+	if (WARN_ON(pull >= GPIO_PULL_INVALID))
+		return -EINVAL;
+
+	strength = (gpiospec->args[1] >> GPIO_DRV_STRENGTH_BIT_SHIFT) &
+		GPIO_DRV_STRENGTH_BIT_MASK;
+
+	if (flags)
+		*flags = gpiospec->args[1] & GPIO_FLAG_BIT_MASK;
+
+	bcm_cygnus_gpio_set_pull(cygnus_gpio, gpiospec->args[0], pull);
+	bcm_cygnus_gpio_set_strength(cygnus_gpio, gpiospec->args[0], strength);
+
+	return gpiospec->args[0];
+}
+#endif
+
+static const struct of_device_id bcm_cygnus_gpio_of_match[] = {
+	{ .compatible = "brcm,cygnus-gpio" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, bcm_cygnus_gpio_of_match);
+
+static int bcm_cygnus_gpio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	const struct of_device_id *match;
+	struct resource *res;
+	struct bcm_cygnus_gpio *cygnus_gpio;
+	struct gpio_chip *gc;
+	u32 i, ngpios;
+	int ret;
+
+	match = of_match_device(bcm_cygnus_gpio_of_match, dev);
+	if (!match) {
+		dev_err(&pdev->dev, "failed to find GPIO controller\n");
+		return -ENODEV;
+	}
+
+	cygnus_gpio = devm_kzalloc(dev, sizeof(*cygnus_gpio), GFP_KERNEL);
+	if (!cygnus_gpio)
+		return -ENOMEM;
+
+	cygnus_gpio->dev = dev;
+	platform_set_drvdata(pdev, cygnus_gpio);
+
+	if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
+		dev_err(&pdev->dev, "missing ngpios device tree property\n");
+		return -ENODEV;
+	}
+	cygnus_gpio->num_banks = (ngpios + NGPIOS_PER_BANK - 1) /
+		NGPIOS_PER_BANK;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "unable to get I/O resource\n");
+		return -ENODEV;
+	}
+
+	cygnus_gpio->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(cygnus_gpio->base)) {
+		dev_err(&pdev->dev, "unable to map I/O memory\n");
+		return PTR_ERR(cygnus_gpio->base);
+	}
+
+	/*
+	 * Only certain types of Cygnus GPIO interfaces have I/O control
+	 * registers
+	 */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (res) {
+		cygnus_gpio->io_ctrl = devm_ioremap_resource(dev, res);
+		if (IS_ERR(cygnus_gpio->io_ctrl)) {
+			dev_err(&pdev->dev, "unable to map I/O memory\n");
+			return PTR_ERR(cygnus_gpio->io_ctrl);
+		}
+	}
+
+	spin_lock_init(&cygnus_gpio->lock);
+
+	gc = &cygnus_gpio->gc;
+	gc->base = gpio_base_index;
+	gpio_base_index += ngpios;
+	gc->ngpio = ngpios;
+	gc->label = dev_name(dev);
+	gc->dev = dev;
+#ifdef CONFIG_OF_GPIO
+	gc->of_node = dev->of_node;
+	gc->of_gpio_n_cells = 2;
+	gc->of_xlate = bcm_cygnus_gpio_of_xlate;
+#endif
+	gc->direction_input = bcm_cygnus_gpio_direction_input;
+	gc->direction_output = bcm_cygnus_gpio_direction_output;
+	gc->set = bcm_cygnus_gpio_set;
+	gc->get = bcm_cygnus_gpio_get;
+	gc->to_irq = bcm_cygnus_gpio_to_irq;
+
+	ret = gpiochip_add(gc);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "unable to add GPIO chip\n");
+		goto err_dec_gpio_base;
+	}
+
+	/*
+	 * Some of the GPIO interfaces do not have interrupt wired to the main
+	 * processor
+	 */
+	cygnus_gpio->irq = platform_get_irq(pdev, 0);
+	if (cygnus_gpio->irq < 0) {
+		ret = cygnus_gpio->irq;
+		if (ret == -EPROBE_DEFER)
+			goto err_rm_gpiochip;
+
+		dev_info(&pdev->dev, "no interrupt hook\n");
+	}
+
+	cygnus_gpio->irq_domain = irq_domain_add_linear(dev->of_node,
+			gc->ngpio, &bcm_cygnus_irq_ops, cygnus_gpio);
+	if (!cygnus_gpio->irq_domain) {
+		dev_err(&pdev->dev, "unable to allocate IRQ domain\n");
+		ret = -ENXIO;
+		goto err_rm_gpiochip;
+	}
+
+	for (i = 0; i < gc->ngpio; i++) {
+		int irq = irq_create_mapping(cygnus_gpio->irq_domain, i);
+
+		irq_set_lockdep_class(irq, &gpio_lock_class);
+		irq_set_chip_data(irq, cygnus_gpio);
+		irq_set_chip_and_handler(irq, &bcm_cygnus_gpio_irq_chip,
+				handle_simple_irq);
+		set_irq_flags(irq, IRQF_VALID);
+	}
+
+	irq_set_chained_handler(cygnus_gpio->irq, bcm_cygnus_gpio_irq_handler);
+	irq_set_handler_data(cygnus_gpio->irq, cygnus_gpio);
+
+	return 0;
+
+err_rm_gpiochip:
+	gpiochip_remove(gc);
+
+err_dec_gpio_base:
+	gpio_base_index -= ngpios;
+	return ret;
+}
+
+static struct platform_driver bcm_cygnus_gpio_driver = {
+	.driver = {
+		.name = "bcm-cygnus-gpio",
+		.owner = THIS_MODULE,
+		.of_match_table = bcm_cygnus_gpio_of_match,
+	},
+	.probe = bcm_cygnus_gpio_probe,
+};
+
+module_platform_driver(bcm_cygnus_gpio_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus GPIO Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v4 3/5] ARM: mach-bcm: Enable GPIO support for Cygnus

[Ray Jui]

Enable GPIO driver for Broadcom Cygnus SoC by selecting GPIO_BCM_CYGNUS

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/mach-bcm/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index aaeec78..5066d5d 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -29,6 +29,7 @@ config ARCH_BCM_IPROC
 config ARCH_BCM_CYGNUS
 	bool "Broadcom Cygnus Support" if ARCH_MULTI_V7
 	select ARCH_BCM_IPROC
+	select GPIO_BCM_CYGNUS
 	help
 	  Enable support for the Cygnus family,
 	  which includes the following variants:
-- 
1.7.9.5

[PATCH v4 3/5] ARM: mach-bcm: Enable GPIO support for Cygnus

[Ray Jui]

Enable GPIO driver for Broadcom Cygnus SoC by selecting GPIO_BCM_CYGNUS

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/mach-bcm/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index aaeec78..5066d5d 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -29,6 +29,7 @@ config ARCH_BCM_IPROC
 config ARCH_BCM_CYGNUS
 	bool "Broadcom Cygnus Support" if ARCH_MULTI_V7
 	select ARCH_BCM_IPROC
+	select GPIO_BCM_CYGNUS
 	help
 	  Enable support for the Cygnus family,
 	  which includes the following variants:
-- 
1.7.9.5

[PATCH v4 3/5] ARM: mach-bcm: Enable GPIO support for Cygnus

[Ray Jui]

Enable GPIO driver for Broadcom Cygnus SoC by selecting GPIO_BCM_CYGNUS

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/mach-bcm/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index aaeec78..5066d5d 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -29,6 +29,7 @@ config ARCH_BCM_IPROC
 config ARCH_BCM_CYGNUS
 	bool "Broadcom Cygnus Support" if ARCH_MULTI_V7
 	select ARCH_BCM_IPROC
+	select GPIO_BCM_CYGNUS
 	help
 	  Enable support for the Cygnus family,
 	  which includes the following variants:
-- 
1.7.9.5

[PATCH v4 4/5] ARM: dts: enable GPIO for Broadcom Cygnus

[Ray Jui]

This enables all 3 GPIO controllers including the ASIU GPIO, the
chipcommonG GPIO, and the ALWAYS-ON GPIO, for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..fbc8257 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -54,6 +54,36 @@
 
 	/include/ "bcm-cygnus-clock.dtsi"
 
+	gpio_ccm: gpio@1800a000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x1800a000 0x50>,
+			<0x0301d164 0x20>;
+		ngpios = <24>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+	};
+
+	gpio_asiu: gpio@180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio@03024800 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-drv-strength;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

[PATCH v4 4/5] ARM: dts: enable GPIO for Broadcom Cygnus

[Ray Jui]

This enables all 3 GPIO controllers including the ASIU GPIO, the
chipcommonG GPIO, and the ALWAYS-ON GPIO, for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..fbc8257 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -54,6 +54,36 @@
 
 	/include/ "bcm-cygnus-clock.dtsi"
 
+	gpio_ccm: gpio@1800a000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x1800a000 0x50>,
+			<0x0301d164 0x20>;
+		ngpios = <24>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+	};
+
+	gpio_asiu: gpio@180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio@03024800 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-drv-strength;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

[PATCH v4 4/5] ARM: dts: enable GPIO for Broadcom Cygnus

[Ray Jui]

This enables all 3 GPIO controllers including the ASIU GPIO, the
chipcommonG GPIO, and the ALWAYS-ON GPIO, for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..fbc8257 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -54,6 +54,36 @@
 
 	/include/ "bcm-cygnus-clock.dtsi"
 
+	gpio_ccm: gpio at 1800a000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x1800a000 0x50>,
+			<0x0301d164 0x20>;
+		ngpios = <24>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+	};
+
+	gpio_asiu: gpio at 180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio at 03024800 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-drv-strength;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

[PATCH v4 5/5] MAINTAINERS: Entry for Cygnus GPIO driver

[Ray Jui]

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 MAINTAINERS |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index e6bff3a..8473422 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2202,6 +2202,13 @@ N:	bcm9583*
 N:	bcm583*
 N:	bcm113*
 
+BROADCOM CYGNUS GPIO DRIVER
+M:	Ray Jui <rjui@broadcom.com>
+L:	bcm-kernel-feedback-list@broadcom.com
+S:	Supported
+F:	drivers/gpio/gpio-bcm-cygnus.c
+F:	Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
+
 BROADCOM KONA GPIO DRIVER
 M:	Ray Jui <rjui@broadcom.com>
 L:	bcm-kernel-feedback-list@broadcom.com
-- 
1.7.9.5

[PATCH v4 5/5] MAINTAINERS: Entry for Cygnus GPIO driver

[Ray Jui]

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 MAINTAINERS |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index e6bff3a..8473422 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2202,6 +2202,13 @@ N:	bcm9583*
 N:	bcm583*
 N:	bcm113*
 
+BROADCOM CYGNUS GPIO DRIVER
+M:	Ray Jui <rjui@broadcom.com>
+L:	bcm-kernel-feedback-list@broadcom.com
+S:	Supported
+F:	drivers/gpio/gpio-bcm-cygnus.c
+F:	Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
+
 BROADCOM KONA GPIO DRIVER
 M:	Ray Jui <rjui@broadcom.com>
 L:	bcm-kernel-feedback-list@broadcom.com
-- 
1.7.9.5

[PATCH v4 5/5] MAINTAINERS: Entry for Cygnus GPIO driver

[Ray Jui]

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 MAINTAINERS |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index e6bff3a..8473422 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2202,6 +2202,13 @@ N:	bcm9583*
 N:	bcm583*
 N:	bcm113*
 
+BROADCOM CYGNUS GPIO DRIVER
+M:	Ray Jui <rjui@broadcom.com>
+L:	bcm-kernel-feedback-list at broadcom.com
+S:	Supported
+F:	drivers/gpio/gpio-bcm-cygnus.c
+F:	Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
+
 BROADCOM KONA GPIO DRIVER
 M:	Ray Jui <rjui@broadcom.com>
 L:	bcm-kernel-feedback-list at broadcom.com
-- 
1.7.9.5

[PATCH 0/4] Add PCIe support to Broadcom iProc

[Ray Jui]

This patchset contains the initial PCIe support for Broadcom iProc family of
SoCs. This driver has been validated with Cygnus and NSP and is expected to
work on other iProc family of SoCs that deploy the same PCIe controller

Ray Jui (4):
  pci: iProc: define Broadcom iProc PCIe binding
  PCI: iproc: Add Broadcom iProc PCIe driver
  ARM: mach-bcm: Enable PCIe support for iProc
  ARM: dts: enable PCIe for Broadcom Cygnus

 .../devicetree/bindings/pci/brcm,iproc-pcie.txt    |   62 ++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   43 +
 arch/arm/boot/dts/bcm958300k.dts                   |    8 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/pci/host/Kconfig                           |    9 +
 drivers/pci/host/Makefile                          |    1 +
 drivers/pci/host/pcie-iproc.c                      |  896 ++++++++++++++++++++
 7 files changed, 1020 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
 create mode 100644 drivers/pci/host/pcie-iproc.c

-- 
1.7.9.5

[PATCH 0/4] Add PCIe support to Broadcom iProc

[Ray Jui]

This patchset contains the initial PCIe support for Broadcom iProc family of
SoCs. This driver has been validated with Cygnus and NSP and is expected to
work on other iProc family of SoCs that deploy the same PCIe controller

Ray Jui (4):
  pci: iProc: define Broadcom iProc PCIe binding
  PCI: iproc: Add Broadcom iProc PCIe driver
  ARM: mach-bcm: Enable PCIe support for iProc
  ARM: dts: enable PCIe for Broadcom Cygnus

 .../devicetree/bindings/pci/brcm,iproc-pcie.txt    |   62 ++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   43 +
 arch/arm/boot/dts/bcm958300k.dts                   |    8 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/pci/host/Kconfig                           |    9 +
 drivers/pci/host/Makefile                          |    1 +
 drivers/pci/host/pcie-iproc.c                      |  896 ++++++++++++++++++++
 7 files changed, 1020 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
 create mode 100644 drivers/pci/host/pcie-iproc.c

-- 
1.7.9.5

[PATCH 0/4] Add PCIe support to Broadcom iProc

[Ray Jui]

This patchset contains the initial PCIe support for Broadcom iProc family of
SoCs. This driver has been validated with Cygnus and NSP and is expected to
work on other iProc family of SoCs that deploy the same PCIe controller

Ray Jui (4):
  pci: iProc: define Broadcom iProc PCIe binding
  PCI: iproc: Add Broadcom iProc PCIe driver
  ARM: mach-bcm: Enable PCIe support for iProc
  ARM: dts: enable PCIe for Broadcom Cygnus

 .../devicetree/bindings/pci/brcm,iproc-pcie.txt    |   62 ++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   43 +
 arch/arm/boot/dts/bcm958300k.dts                   |    8 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/pci/host/Kconfig                           |    9 +
 drivers/pci/host/Makefile                          |    1 +
 drivers/pci/host/pcie-iproc.c                      |  896 ++++++++++++++++++++
 7 files changed, 1020 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
 create mode 100644 drivers/pci/host/pcie-iproc.c

-- 
1.7.9.5

[PATCH 1/4] pci: iProc: define Broadcom iProc PCIe binding

[Ray Jui]

Document the PCIe device tree binding for Broadcom iProc family of SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/pci/brcm,iproc-pcie.txt    |   62 ++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt

diff --git a/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
new file mode 100644
index 0000000..2467628
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
@@ -0,0 +1,62 @@
+* Broadcom iProc PCIe controller
+
+Required properties:
+- compatible: Must be "brcm,iproc-pcie"
+- reg: base address and length of the PCIe controller and the MDIO interface
+  that controls the PCIe PHY
+- interrupts: interrupt IDs
+- bus-range: PCI bus numbers covered
+- #address-cells: set to <3>
+- #size-cells: set to <2>
+- device_type: set to "pci"
+- ranges: ranges for the PCI memory and I/O regions
+- phy-addr: MDC/MDIO adddress of the PCIe PHY
+- have-msi-inten-reg: Required for legacy iProc PCIe controllers that need the
+  MSI interrupt enable register to be set explicitly
+
+The Broadcom iProc PCie driver adapts the multi-domain structure, i.e., each
+interface has its own domain and therefore has its own device node
+Example:
+
+SoC specific DT Entry:
+
+	pcie0: pcie@18012000 {
+		compatible = "brcm,iproc-pcie";
+		reg = <0x18012000 0x1000>,
+			<0x18002000 0x1000>;
+		interrupts = <GIC_SPI 96 IRQ_TYPE_NONE>,
+			     <GIC_SPI 97 IRQ_TYPE_NONE>,
+			     <GIC_SPI 98 IRQ_TYPE_NONE>,
+			     <GIC_SPI 99 IRQ_TYPE_NONE>,
+			     <GIC_SPI 100 IRQ_TYPE_NONE>,
+			     <GIC_SPI 101 IRQ_TYPE_NONE>;
+		bus-range = <0x00 0xFF>;
+
+		#address-cells = <3>;
+		#size-cells = <2>;
+		device_type = "pci";
+		ranges = <0x81000000 0 0	  0x28000000 0 0x00010000   /* downstream I/O */
+			  0x82000000 0 0x20000000 0x20000000 0 0x04000000>; /* non-prefetchable memory */
+		phy-addr = <5>;
+	};
+
+	pcie1: pcie@18013000 {
+		compatible = "brcm,iproc-pcie";
+		reg = <0x18013000 0x1000>,
+			<0x18002000 0x1000>;
+
+		interrupts = <GIC_SPI 102 IRQ_TYPE_NONE>,
+			     <GIC_SPI 103 IRQ_TYPE_NONE>,
+			     <GIC_SPI 104 IRQ_TYPE_NONE>,
+			     <GIC_SPI 105 IRQ_TYPE_NONE>,
+			     <GIC_SPI 106 IRQ_TYPE_NONE>,
+			     <GIC_SPI 107 IRQ_TYPE_NONE>;
+		bus-range = <0x00 0xFF>;
+
+		#address-cells = <3>;
+		#size-cells = <2>;
+		device_type = "pci";
+		ranges = <0x81000000 0 0	  0x48000000 0 0x00010000   /* downstream I/O */
+			  0x82000000 0 0x40000000 0x40000000 0 0x04000000>; /* non-prefetchable memory */
+		phy-addr = <6>;
+	};
-- 
1.7.9.5

[PATCH 1/4] pci: iProc: define Broadcom iProc PCIe binding

[Ray Jui]

Document the PCIe device tree binding for Broadcom iProc family of SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/pci/brcm,iproc-pcie.txt    |   62 ++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt

diff --git a/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
new file mode 100644
index 0000000..2467628
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
@@ -0,0 +1,62 @@
+* Broadcom iProc PCIe controller
+
+Required properties:
+- compatible: Must be "brcm,iproc-pcie"
+- reg: base address and length of the PCIe controller and the MDIO interface
+  that controls the PCIe PHY
+- interrupts: interrupt IDs
+- bus-range: PCI bus numbers covered
+- #address-cells: set to <3>
+- #size-cells: set to <2>
+- device_type: set to "pci"
+- ranges: ranges for the PCI memory and I/O regions
+- phy-addr: MDC/MDIO adddress of the PCIe PHY
+- have-msi-inten-reg: Required for legacy iProc PCIe controllers that need the
+  MSI interrupt enable register to be set explicitly
+
+The Broadcom iProc PCie driver adapts the multi-domain structure, i.e., each
+interface has its own domain and therefore has its own device node
+Example:
+
+SoC specific DT Entry:
+
+	pcie0: pcie@18012000 {
+		compatible = "brcm,iproc-pcie";
+		reg = <0x18012000 0x1000>,
+			<0x18002000 0x1000>;
+		interrupts = <GIC_SPI 96 IRQ_TYPE_NONE>,
+			     <GIC_SPI 97 IRQ_TYPE_NONE>,
+			     <GIC_SPI 98 IRQ_TYPE_NONE>,
+			     <GIC_SPI 99 IRQ_TYPE_NONE>,
+			     <GIC_SPI 100 IRQ_TYPE_NONE>,
+			     <GIC_SPI 101 IRQ_TYPE_NONE>;
+		bus-range = <0x00 0xFF>;
+
+		#address-cells = <3>;
+		#size-cells = <2>;
+		device_type = "pci";
+		ranges = <0x81000000 0 0	  0x28000000 0 0x00010000   /* downstream I/O */
+			  0x82000000 0 0x20000000 0x20000000 0 0x04000000>; /* non-prefetchable memory */
+		phy-addr = <5>;
+	};
+
+	pcie1: pcie@18013000 {
+		compatible = "brcm,iproc-pcie";
+		reg = <0x18013000 0x1000>,
+			<0x18002000 0x1000>;
+
+		interrupts = <GIC_SPI 102 IRQ_TYPE_NONE>,
+			     <GIC_SPI 103 IRQ_TYPE_NONE>,
+			     <GIC_SPI 104 IRQ_TYPE_NONE>,
+			     <GIC_SPI 105 IRQ_TYPE_NONE>,
+			     <GIC_SPI 106 IRQ_TYPE_NONE>,
+			     <GIC_SPI 107 IRQ_TYPE_NONE>;
+		bus-range = <0x00 0xFF>;
+
+		#address-cells = <3>;
+		#size-cells = <2>;
+		device_type = "pci";
+		ranges = <0x81000000 0 0	  0x48000000 0 0x00010000   /* downstream I/O */
+			  0x82000000 0 0x40000000 0x40000000 0 0x04000000>; /* non-prefetchable memory */
+		phy-addr = <6>;
+	};
-- 
1.7.9.5

[PATCH 1/4] pci: iProc: define Broadcom iProc PCIe binding

[Ray Jui]

Document the PCIe device tree binding for Broadcom iProc family of SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/pci/brcm,iproc-pcie.txt    |   62 ++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt

diff --git a/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
new file mode 100644
index 0000000..2467628
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
@@ -0,0 +1,62 @@
+* Broadcom iProc PCIe controller
+
+Required properties:
+- compatible: Must be "brcm,iproc-pcie"
+- reg: base address and length of the PCIe controller and the MDIO interface
+  that controls the PCIe PHY
+- interrupts: interrupt IDs
+- bus-range: PCI bus numbers covered
+- #address-cells: set to <3>
+- #size-cells: set to <2>
+- device_type: set to "pci"
+- ranges: ranges for the PCI memory and I/O regions
+- phy-addr: MDC/MDIO adddress of the PCIe PHY
+- have-msi-inten-reg: Required for legacy iProc PCIe controllers that need the
+  MSI interrupt enable register to be set explicitly
+
+The Broadcom iProc PCie driver adapts the multi-domain structure, i.e., each
+interface has its own domain and therefore has its own device node
+Example:
+
+SoC specific DT Entry:
+
+	pcie0: pcie at 18012000 {
+		compatible = "brcm,iproc-pcie";
+		reg = <0x18012000 0x1000>,
+			<0x18002000 0x1000>;
+		interrupts = <GIC_SPI 96 IRQ_TYPE_NONE>,
+			     <GIC_SPI 97 IRQ_TYPE_NONE>,
+			     <GIC_SPI 98 IRQ_TYPE_NONE>,
+			     <GIC_SPI 99 IRQ_TYPE_NONE>,
+			     <GIC_SPI 100 IRQ_TYPE_NONE>,
+			     <GIC_SPI 101 IRQ_TYPE_NONE>;
+		bus-range = <0x00 0xFF>;
+
+		#address-cells = <3>;
+		#size-cells = <2>;
+		device_type = "pci";
+		ranges = <0x81000000 0 0	  0x28000000 0 0x00010000   /* downstream I/O */
+			  0x82000000 0 0x20000000 0x20000000 0 0x04000000>; /* non-prefetchable memory */
+		phy-addr = <5>;
+	};
+
+	pcie1: pcie at 18013000 {
+		compatible = "brcm,iproc-pcie";
+		reg = <0x18013000 0x1000>,
+			<0x18002000 0x1000>;
+
+		interrupts = <GIC_SPI 102 IRQ_TYPE_NONE>,
+			     <GIC_SPI 103 IRQ_TYPE_NONE>,
+			     <GIC_SPI 104 IRQ_TYPE_NONE>,
+			     <GIC_SPI 105 IRQ_TYPE_NONE>,
+			     <GIC_SPI 106 IRQ_TYPE_NONE>,
+			     <GIC_SPI 107 IRQ_TYPE_NONE>;
+		bus-range = <0x00 0xFF>;
+
+		#address-cells = <3>;
+		#size-cells = <2>;
+		device_type = "pci";
+		ranges = <0x81000000 0 0	  0x48000000 0 0x00010000   /* downstream I/O */
+			  0x82000000 0 0x40000000 0x40000000 0 0x04000000>; /* non-prefetchable memory */
+		phy-addr = <6>;
+	};
-- 
1.7.9.5

[PATCH 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Ray Jui]

Add initial version of the Broadcom iProc PCIe driver. This driver
has been tested on NSP and Cygnus and is expected to work on all iProc
family of SoCs that deploys the same PCIe host controller

The driver also supports MSI

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/pci/host/Kconfig      |    9 +
 drivers/pci/host/Makefile     |    1 +
 drivers/pci/host/pcie-iproc.c |  896 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 906 insertions(+)
 create mode 100644 drivers/pci/host/pcie-iproc.c

diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
index c4b6568..22322e1 100644
--- a/drivers/pci/host/Kconfig
+++ b/drivers/pci/host/Kconfig
@@ -102,4 +102,13 @@ config PCI_LAYERSCAPE
 	help
 	  Say Y here if you want PCIe controller support on Layerscape SoCs.
 
+config PCIE_IPROC
+	bool "Broadcom iProc PCIe controller"
+	depends on ARCH_BCM_IPROC
+	help
+	  Say Y here if you want to enable the PCIe controller driver support
+	  on Broadcom's iProc family of SoCs.
+
+	  MSI is also supported in the driver.
+
 endmenu
diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
index 44c2699..1f5e9d2 100644
--- a/drivers/pci/host/Makefile
+++ b/drivers/pci/host/Makefile
@@ -12,3 +12,4 @@ obj-$(CONFIG_PCI_KEYSTONE) += pci-keystone-dw.o pci-keystone.o
 obj-$(CONFIG_PCIE_XILINX) += pcie-xilinx.o
 obj-$(CONFIG_PCI_XGENE) += pci-xgene.o
 obj-$(CONFIG_PCI_LAYERSCAPE) += pci-layerscape.o
+obj-$(CONFIG_PCIE_IPROC) += pcie-iproc.o
diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
new file mode 100644
index 0000000..bd9f01c
--- /dev/null
+++ b/drivers/pci/host/pcie-iproc.c
@@ -0,0 +1,896 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/msi.h>
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/mbus.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/of_address.h>
+#include <linux/of_pci.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+
+/* max number of MSI event queues */
+#define MAX_MSI_EQ 6
+#define MAX_IRQS MAX_MSI_EQ
+
+#define MDIO_TIMEOUT_USEC 100
+
+#define OPCODE_WRITE 1
+#define OPCODE_READ  2
+
+#define MII_TA_VAL 2
+#define MII_MDCDIV 62
+
+#define MII_MGMT_CTRL_OFFSET         0x000
+#define MII_MGMT_CTRL_MDCDIV_SHIFT   0
+#define MII_MGMT_CTRL_PRE_SHIFT      7
+#define MII_MGMT_CTRL_BUSY_SHIFT     8
+#define MII_MGMT_CTRL_EXT_SHIFT      9
+#define MII_MGMT_CTRL_BTP_SHIFT      10
+
+#define MII_MGMT_CMD_DATA_OFFSET     0x004
+#define MII_MGMT_CMD_DATA_SHIFT      0
+#define MII_MGMT_CMD_TA_SHIFT        16
+#define MII_MGMT_CMD_RA_SHIFT        18
+#define MII_MGMT_CMD_PA_SHIFT        23
+#define MII_MGMT_CMD_OP_SHIFT        28
+#define MII_MGMT_CMD_SB_SHIFT        30
+#define MII_MGMT_CMD_DATA_MASK       0xFFFF
+
+#define CLK_CONTROL_OFFSET           0x000
+#define EP_PERST_SOURCE_SELECT_SHIFT 2
+#define EP_PERST_SOURCE_SELECT       (1 << EP_PERST_SOURCE_SELECT_SHIFT)
+#define EP_MODE_SURVIVE_PERST_SHIFT  1
+#define EP_MODE_SURVIVE_PERST        (1 << EP_MODE_SURVIVE_PERST_SHIFT)
+#define RC_PCIE_RST_OUTPUT_SHIFT     0
+#define RC_PCIE_RST_OUTPUT           (1 << RC_PCIE_RST_OUTPUT_SHIFT)
+
+#define CFG_IND_ADDR_OFFSET          0x120
+#define CFG_IND_ADDR_MASK            0x00001FFC
+
+#define CFG_IND_DATA_OFFSET          0x124
+
+#define CFG_ADDR_OFFSET              0x1F8
+#define CFG_ADDR_BUS_NUM_SHIFT       20
+#define CFG_ADDR_BUS_NUM_MASK        0x0FF00000
+#define CFG_ADDR_DEV_NUM_SHIFT       15
+#define CFG_ADDR_DEV_NUM_MASK        0x000F8000
+#define CFG_ADDR_FUNC_NUM_SHIFT      12
+#define CFG_ADDR_FUNC_NUM_MASK       0x00007000
+#define CFG_ADDR_REG_NUM_SHIFT       2
+#define CFG_ADDR_REG_NUM_MASK        0x00000FFC
+#define CFG_ADDR_CFG_TYPE_SHIFT      0
+#define CFG_ADDR_CFG_TYPE_MASK       0x00000003
+
+#define CFG_DATA_OFFSET              0x1FC
+
+#define SYS_EQ_PAGE_OFFSET           0x200
+#define SYS_MSI_PAGE_OFFSET          0x204
+
+#define SYS_MSI_INTS_EN_OFFSET       0x208
+
+#define SYS_MSI_CTRL_0_OFFSET        0x210
+#define SYS_MSI_INTR_EN_SHIFT        11
+#define SYS_MSI_INTR_EN              (1 << SYS_MSI_INTR_EN_SHIFT)
+#define SYS_MSI_INT_N_EVENT_SHIFT    1
+#define SYS_MSI_INT_N_EVENT          (1 << SYS_MSI_INT_N_EVENT_SHIFT)
+#define SYS_MSI_EQ_EN_SHIFT          0
+#define SYS_MSI_EQ_EN                (1 << SYS_MSI_EQ_EN_SHIFT)
+
+#define SYS_EQ_HEAD_0_OFFSET         0x250
+#define SYS_EQ_TAIL_0_OFFSET         0x254
+#define SYS_EQ_TAIL_0_MASK           0x3F
+
+#define SYS_RC_INTX_EN               0x330
+#define SYS_RC_INTX_MASK             0xF
+
+#define SYS_RC_INTX_CSR              0x334
+#define SYS_RC_INTX_MASK             0xF
+
+#define OARR_0_OFFSET                0xD20
+#define OAAR_0_ADDR_MASK             0xF0000000
+#define OAAR_0_VALID_SHIFT           0
+#define OAAR_0_VALID                 (1 << OAAR_0_VALID_SHIFT)
+#define OAAR_0_UPPER_OFFSET          0xD24
+#define OAAR_0_UPPER_ADDR_MASK       0x0000000F
+
+#define PCIE_SYS_RC_INTX_EN_OFFSET   0x330
+
+#define OMAP_0_LOWER_OFFSET          0xD40
+#define OMAP_0_LOWER_ADDR_MASK       0xF0000000
+#define OMAP_0_UPPER_OFFSET          0x0D44
+
+#define PCIE_LINK_STATUS_OFFSET      0xF0C
+#define PCIE_PHYLINKUP_SHITF         3
+#define PCIE_PHYLINKUP               (1 << PCIE_PHYLINKUP_SHITF)
+
+#define STRAP_STATUS_OFFSET          0xF10
+#define STRAP_1LANE_SHIFT            2
+#define STRAP_1LANE                  (1 << STRAP_1LANE_SHIFT)
+#define STRAP_IF_ENABLE_SHIFT        1
+#define STRAP_IF_ENABLE              (1 << STRAP_IF_ENABLE_SHIFT)
+#define STRAP_RC_MODE_SHIFT          0
+#define STRAP_RC_MODE                (1 << STRAP_RC_MODE_SHIFT)
+
+struct iproc_pcie;
+
+/**
+ * iProc MSI
+ * @pcie: pointer to the iProc PCIe data structure
+ * @irq_in_use: bitmap of MSI IRQs that are in use
+ * @domain: MSI IRQ domain
+ * @chip: MSI controller
+ * @eq_page: memory page to store the iProc MSI event queue
+ * @msi_page: memory page for MSI posted writes
+ */
+struct iproc_msi {
+	struct iproc_pcie *pcie;
+	DECLARE_BITMAP(irq_in_use, MAX_IRQS);
+	struct irq_domain *domain;
+	struct msi_controller chip;
+	unsigned long eq_page;
+	unsigned long msi_page;
+};
+
+/**
+ * iProc PCIe
+ * @dev: pointer to the device
+ * @mii: MII/MDIO management I/O register base
+ * @reg: PCIe I/O register base
+ * @io: PCIe I/O resource
+ * @mem: PCIe memory resource
+ * @busn: PCIe bus resource
+ * @phy_addr: MIDO PHY address
+ * @irqs: Array that stores IRQs
+ * @msi: MSI related info
+ */
+struct iproc_pcie {
+	struct device *dev;
+
+	void __iomem *mii;
+	void __iomem *reg;
+
+	struct resource io;
+	struct resource mem;
+	struct resource busn;
+
+	u32 phy_addr;
+	int irqs[MAX_IRQS];
+
+	struct iproc_msi msi;
+};
+
+static inline int mdio_wait_idle(struct iproc_pcie *pcie)
+{
+	int timeout = MDIO_TIMEOUT_USEC;
+
+	while (readl(pcie->mii + MII_MGMT_CTRL_OFFSET) &
+			(1 << MII_MGMT_CTRL_BUSY_SHIFT)) {
+		udelay(1);
+		if (timeout-- <= 0)
+			return -EBUSY;
+	}
+	return 0;
+}
+
+static void mdio_init(struct iproc_pcie *pcie)
+{
+	u32 val;
+
+	val = MII_MDCDIV << MII_MGMT_CTRL_MDCDIV_SHIFT;
+	val |= (1 << MII_MGMT_CTRL_PRE_SHIFT);
+	writel(val, pcie->mii + MII_MGMT_CTRL_OFFSET);
+
+	WARN_ON(mdio_wait_idle(pcie));
+}
+
+static u16 mdio_read(struct iproc_pcie *pcie, unsigned int phy_addr,
+		unsigned int reg_addr)
+{
+	u32 val;
+
+	WARN_ON(mdio_wait_idle(pcie));
+
+	val = (MII_TA_VAL << MII_MGMT_CMD_TA_SHIFT);
+	val |= (reg_addr << MII_MGMT_CMD_RA_SHIFT);
+	val |= (phy_addr << MII_MGMT_CMD_PA_SHIFT);
+	val |= (OPCODE_READ << MII_MGMT_CMD_OP_SHIFT);
+	val |= (1 << MII_MGMT_CMD_SB_SHIFT);
+	writel(val, pcie->mii + MII_MGMT_CMD_DATA_OFFSET);
+
+	WARN_ON(mdio_wait_idle(pcie));
+
+	val = readl(pcie->mii + MII_MGMT_CMD_DATA_OFFSET) &
+		MII_MGMT_CMD_DATA_MASK;
+
+	return (u16)val;
+}
+
+static void mdio_write(struct iproc_pcie *pcie, unsigned int phy_addr,
+		unsigned int reg_addr, u16 wr_data)
+{
+	u32 val;
+
+	WARN_ON(mdio_wait_idle(pcie));
+
+	val = (MII_TA_VAL << MII_MGMT_CMD_TA_SHIFT);
+	val |= (reg_addr << MII_MGMT_CMD_RA_SHIFT);
+	val |= (phy_addr << MII_MGMT_CMD_PA_SHIFT);
+	val |= (OPCODE_WRITE << MII_MGMT_CMD_OP_SHIFT);
+	val |= (1 << MII_MGMT_CMD_SB_SHIFT);
+	val |= ((u32)wr_data & MII_MGMT_CMD_DATA_MASK);
+	writel(val, pcie->mii + MII_MGMT_CMD_DATA_OFFSET);
+
+	WARN_ON(mdio_wait_idle(pcie));
+}
+
+#define PCIE_PHY_BLK_ADDR_OFFSET 0x1F
+#define PCIE_PHY_BLK_ADDR_MASK   0xFFF0
+#define PCIE_PHY_REG_ADDR_MASK   0xF
+static u16 iproc_pcie_phy_reg_read(struct iproc_pcie *pcie,
+		unsigned int phy_addr, unsigned int reg_addr)
+{
+	u16 val;
+
+	mdio_write(pcie, phy_addr, PCIE_PHY_BLK_ADDR_OFFSET,
+			reg_addr & PCIE_PHY_BLK_ADDR_MASK);
+	val = mdio_read(pcie, phy_addr, reg_addr & PCIE_PHY_REG_ADDR_MASK);
+
+	dev_dbg(pcie->dev, "phy rd: phy: 0x%0x reg: 0x%4x data: 0x%4x\n",
+			phy_addr, reg_addr, val);
+
+	return val;
+}
+
+static void iproc_pcie_phy_reg_write(struct iproc_pcie *pcie,
+		unsigned int phy_addr, unsigned int reg_addr, u16 val)
+{
+	mdio_write(pcie, phy_addr, PCIE_PHY_BLK_ADDR_OFFSET,
+			reg_addr & PCIE_PHY_BLK_ADDR_MASK);
+	mdio_write(pcie, phy_addr, reg_addr & PCIE_PHY_REG_ADDR_MASK, val);
+
+	dev_dbg(pcie->dev, "phy wr: phy: 0x%0x reg: 0x%4x data: 0x%4x\n",
+			phy_addr, reg_addr, val);
+}
+
+static inline struct iproc_pcie *sys_to_pcie(struct pci_sys_data *sys)
+{
+	return sys->private_data;
+}
+
+static void iproc_pcie_reset(struct iproc_pcie *pcie)
+{
+	u32 val;
+
+	/* send a downstream reset */
+	val = EP_MODE_SURVIVE_PERST | RC_PCIE_RST_OUTPUT;
+	writel(val, pcie->reg + CLK_CONTROL_OFFSET);
+	udelay(250);
+	val &= ~EP_MODE_SURVIVE_PERST;
+	writel(val, pcie->reg + CLK_CONTROL_OFFSET);
+	mdelay(250);
+}
+
+#define INVALID_ACCESS_OFFSET 0xFFFFFFFF
+static u32 iproc_pcie_conf_access(struct iproc_pcie *pcie, struct pci_bus *bus,
+		unsigned int devfn, int where)
+{
+	int busno = bus->number;
+	int slot = PCI_SLOT(devfn);
+	int fn = PCI_FUNC(devfn);
+	u32 val;
+
+	/* root complex access */
+	if (busno == 0) {
+		if (slot)
+			return INVALID_ACCESS_OFFSET;
+		writel(where & CFG_IND_ADDR_MASK,
+				pcie->reg + CFG_IND_ADDR_OFFSET);
+		return CFG_IND_DATA_OFFSET;
+	}
+
+	if (fn > 1)
+		return INVALID_ACCESS_OFFSET;
+
+	/* access of EP device */
+	val = (bus->number << CFG_ADDR_BUS_NUM_SHIFT) |
+		(PCI_SLOT(devfn) << CFG_ADDR_DEV_NUM_SHIFT) |
+		(PCI_FUNC(devfn) << CFG_ADDR_FUNC_NUM_SHIFT) |
+		(where & CFG_ADDR_REG_NUM_MASK) |
+		(1 & CFG_ADDR_CFG_TYPE_MASK);
+	writel(val, pcie->reg + CFG_ADDR_OFFSET);
+
+	return CFG_DATA_OFFSET;
+}
+
+#define INVALID_CFG_RD 0xFFFFFFFF
+static int iproc_pci_read_conf(struct pci_bus *bus, unsigned int devfn,
+		int where, int size, u32 *val)
+{
+	u32 offset;
+	struct iproc_pcie *pcie = sys_to_pcie(bus->sysdata);
+
+	*val = INVALID_CFG_RD;
+
+	if (size != 1 && size != 2 && size != 4)
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+	else if ((size == 2) && (where & 1))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+	else if ((size == 4) && (where & 3))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	offset = iproc_pcie_conf_access(pcie, bus, devfn, where);
+	if (offset == INVALID_ACCESS_OFFSET)
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	*val = readl(pcie->reg + offset);
+
+	switch (size) {
+	case 4:
+		/* return raw data */
+		break;
+	case 2:
+		*val = (*val >> (8 * (where & 3))) & 0xFFFF;
+		break;
+	case 1:
+		*val = (*val >> (8 * (where & 3))) & 0xFF;
+		break;
+	default:
+		BUG_ON(1);
+	}
+
+	dev_dbg(pcie->dev, "conf rd: busn=%d devfn=%d where=%d size=%d val=0x%08x\n",
+			bus->number, devfn, where, size, *val);
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int iproc_pci_write_conf(struct pci_bus *bus, unsigned int devfn,
+		int where, int size, u32 val)
+{
+	int shift;
+	u32 offset, data;
+	struct iproc_pcie *pcie = sys_to_pcie(bus->sysdata);
+
+	if (size != 1 && size != 2 && size != 4)
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+	else if ((size == 2) && (where & 1))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+	else if ((size == 4) && (where & 3))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	offset = iproc_pcie_conf_access(pcie, bus, devfn, where);
+	if (offset == INVALID_ACCESS_OFFSET)
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	data = readl(pcie->reg + offset);
+
+	switch (size) {
+	case 4:
+		data = val;
+		break;
+	case 2:
+		shift = 8 * (where & 2);
+		data &= ~(0xFFFF << shift);
+		data |= ((val & 0xFFFF) << shift);
+		break;
+	case 1:
+		shift = 8 * (where & 3);
+		data &= ~(0xFF << shift);
+		data |= ((val & 0xFF) << shift);
+		break;
+	default:
+		BUG_ON(1);
+	}
+
+	writel(data, pcie->reg + offset);
+
+	dev_dbg(pcie->dev,
+		"config wr: busn=%d devfn=%d where=%d size=%d data=0x%08x\n",
+		bus->number, devfn, where, size, data);
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static struct pci_ops iproc_pcie_ops = {
+	.read = iproc_pci_read_conf,
+	.write = iproc_pci_write_conf,
+};
+
+static int iproc_pcie_check_link(struct iproc_pcie *pcie)
+{
+	int ret;
+	u8 nlw;
+	u16 pos, tmp16;
+	u32 val;
+	struct pci_sys_data sys;
+	struct pci_bus bus;
+
+	val = readl(pcie->reg + PCIE_LINK_STATUS_OFFSET);
+	dev_dbg(pcie->dev, "link status: 0x%08x\n", val);
+
+	val = readl(pcie->reg + STRAP_STATUS_OFFSET);
+	dev_dbg(pcie->dev, "strap status: 0x%08x\n", val);
+
+	memset(&sys, 0, sizeof(sys));
+	memset(&bus, 0, sizeof(bus));
+
+	bus.number = 0;
+	bus.ops = &iproc_pcie_ops;
+	bus.sysdata = &sys;
+	sys.private_data = pcie;
+
+	ret = iproc_pci_read_conf(&bus, 0, PCI_HEADER_TYPE, 1, &val);
+	if (ret != PCIBIOS_SUCCESSFUL || val != PCI_HEADER_TYPE_BRIDGE) {
+		dev_err(pcie->dev, "in EP mode, val=0x08%x\n", val);
+		return -EFAULT;
+	}
+
+	/*
+	 * Under RC mode, write to function specific register 0x43c, to change
+	 * the CLASS code in configuration space
+	 *
+	 * After this modification, the CLASS code in configuration space would
+	 * be read as PCI_CLASS_BRIDGE_PCI(0x0604)
+	 */
+#define PCI_BRIDGE_CTRL_REG_OFFSET 0x43C
+#define PCI_CLASS_BRIDGE_PCI_MASK  0xFF0000FF
+	pci_bus_read_config_dword(&bus, 0, PCI_BRIDGE_CTRL_REG_OFFSET, &val);
+	val = (val & PCI_CLASS_BRIDGE_PCI_MASK) | (PCI_CLASS_BRIDGE_PCI << 8);
+	pci_bus_write_config_dword(&bus, 0, PCI_BRIDGE_CTRL_REG_OFFSET, val);
+
+	/* check link status to see if link is active */
+	pos = pci_bus_find_capability(&bus, 0, PCI_CAP_ID_EXP);
+	pci_bus_read_config_word(&bus, 0, pos + PCI_EXP_LNKSTA, &tmp16);
+	tmp16 &= PCI_EXP_LNKSTA_DLLLA;
+	nlw = (tmp16 & PCI_EXP_LNKSTA_NLW) >> PCI_EXP_LNKSTA_NLW_SHIFT;
+
+	if (nlw == 0) {
+		/* try GEN 1 link speed */
+#define PCI_LINK_STATUS_CTRL_2_OFFSET 0xDC
+#define PCI_TARGET_LINK_SPEED_MASK    0xF
+#define PCI_TARGET_LINK_SPEED_GEN2    0x2
+#define PCI_TARGET_LINK_SPEED_GEN1    0x1
+		pci_bus_read_config_dword(&bus, 0,
+				PCI_LINK_STATUS_CTRL_2_OFFSET, &val);
+		if ((val & PCI_TARGET_LINK_SPEED_MASK) ==
+				PCI_TARGET_LINK_SPEED_GEN2) {
+			val &= ~PCI_TARGET_LINK_SPEED_MASK;
+			val |= PCI_TARGET_LINK_SPEED_GEN1;
+			pci_bus_write_config_dword(&bus, 0,
+					PCI_LINK_STATUS_CTRL_2_OFFSET, val);
+			pci_bus_read_config_dword(&bus, 0,
+					PCI_LINK_STATUS_CTRL_2_OFFSET, &val);
+			mdelay(100);
+
+			pos = pci_bus_find_capability(&bus, 0, PCI_CAP_ID_EXP);
+			pci_bus_read_config_word(&bus, 0, pos + PCI_EXP_LNKSTA,
+					&tmp16);
+			nlw = (tmp16 & PCI_EXP_LNKSTA_NLW) >>
+				PCI_EXP_LNKSTA_NLW_SHIFT;
+		}
+	}
+
+	dev_info(pcie->dev, "link: %s\n", nlw ? "UP" : "DOWN");
+
+	return nlw ? 0 : -ENODEV;
+}
+
+static int iproc_pcie_setup(int nr, struct pci_sys_data *sys)
+{
+	struct iproc_pcie *pcie = sys_to_pcie(sys);
+
+	pci_add_resource(&sys->resources, &pcie->io);
+	pci_add_resource(&sys->resources, &pcie->mem);
+	pci_add_resource(&sys->resources, &pcie->busn);
+
+	return 1;
+}
+
+static struct pci_bus *iproc_pcie_scan_bus(int nr, struct pci_sys_data *sys)
+{
+	struct iproc_pcie *pcie = sys->private_data;
+	struct pci_bus *bus;
+
+	bus = pci_create_root_bus(pcie->dev, sys->busnr, &iproc_pcie_ops, sys,
+			&sys->resources);
+	if (!bus)
+		return NULL;
+
+	if (IS_ENABLED(CONFIG_PCI_MSI))
+		bus->msi = &pcie->msi.chip;
+
+	pci_scan_child_bus(bus);
+
+	return bus;
+}
+
+static int iproc_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+{
+	struct iproc_pcie *pcie = sys_to_pcie(dev->sysdata);
+
+	/* need to use the 5th IRQ for INTx */
+	return pcie->irqs[4];
+}
+
+static struct hw_pci hw;
+
+static void iproc_pcie_enable(struct iproc_pcie *pcie)
+{
+	hw.nr_controllers = 1;
+	hw.private_data = (void **)&pcie;
+	hw.setup = iproc_pcie_setup;
+	hw.scan = iproc_pcie_scan_bus;
+	hw.map_irq = iproc_pcie_map_irq;
+	hw.ops = &iproc_pcie_ops;
+
+	/* enable root complex INTX */
+	writel(SYS_RC_INTX_MASK, pcie->reg + SYS_RC_INTX_EN);
+
+	pci_common_init_dev(pcie->dev, &hw);
+#ifdef CONFIG_PCI_DOMAINS
+	hw.domain++;
+#endif
+}
+
+#define PCIE_PHY_REG_ADDR 0x2103
+#define PCIE_PHY_DATA     0x2B1C
+static void iproc_pcie_mii_phy_init(struct iproc_pcie *pcie, u32 phy_addr)
+{
+	unsigned int reg_addr;
+	u16 val;
+
+	mdio_init(pcie);
+
+	reg_addr = PCIE_PHY_REG_ADDR;
+	val = PCIE_PHY_DATA;
+	iproc_pcie_phy_reg_write(pcie, phy_addr, reg_addr, val);
+	val = iproc_pcie_phy_reg_read(pcie, phy_addr, reg_addr);
+	dev_info(pcie->dev, "phy: 0x%x reg: 0x%4x val: 0x%4x\n", phy_addr,
+			reg_addr, val);
+}
+
+static inline struct iproc_msi *to_iproc_msi(struct msi_controller *chip)
+{
+	return container_of(chip, struct iproc_msi, chip);
+}
+
+static int iproc_msi_irq_assign(struct iproc_msi *chip)
+{
+	int msi;
+
+	msi = find_first_zero_bit(chip->irq_in_use, MAX_IRQS);
+	if (msi < MAX_IRQS)
+		set_bit(msi, chip->irq_in_use);
+	else
+		msi = -ENOSPC;
+
+	return msi;
+}
+
+static void iproc_msi_irq_free(struct iproc_msi *chip, unsigned long irq)
+{
+	clear_bit(irq, chip->irq_in_use);
+}
+
+static int iproc_msi_setup_irq(struct msi_controller *chip,
+		struct pci_dev *pdev, struct msi_desc *desc)
+{
+	struct iproc_msi *msi = to_iproc_msi(chip);
+	struct iproc_pcie *pcie = msi->pcie;
+	struct msi_msg msg;
+	unsigned int irq;
+	int hwirq;
+
+	hwirq = iproc_msi_irq_assign(msi);
+	if (hwirq < 0)
+		return hwirq;
+
+	irq = irq_create_mapping(msi->domain, hwirq);
+	if (!irq) {
+		iproc_msi_irq_free(msi, hwirq);
+		return -EINVAL;
+	}
+
+	dev_dbg(pcie->dev, "mapped irq:%d\n", irq);
+
+	irq_set_msi_desc(irq, desc);
+
+	msg.address_lo = virt_to_phys((void *)msi->msi_page) | (hwirq * 4);
+	msg.address_hi = 0x0;
+	msg.data = hwirq;
+
+	write_msi_msg(irq, &msg);
+
+	return 0;
+}
+
+static void iproc_msi_teardown_irq(struct msi_controller *chip,
+		unsigned int irq)
+{
+	struct iproc_msi *msi = to_iproc_msi(chip);
+	struct irq_data *data = irq_get_irq_data(irq);
+
+	iproc_msi_irq_free(msi, data->hwirq);
+}
+
+static struct irq_chip iproc_msi_irq_chip = {
+	.name = "iProc PCIe MSI",
+	.irq_enable = unmask_msi_irq,
+	.irq_disable = mask_msi_irq,
+	.irq_mask = mask_msi_irq,
+	.irq_unmask = unmask_msi_irq,
+};
+
+static int iproc_msi_map(struct irq_domain *domain, unsigned int irq,
+			irq_hw_number_t hwirq)
+{
+	irq_set_chip_and_handler(irq, &iproc_msi_irq_chip, handle_simple_irq);
+	irq_set_chip_data(irq, domain->host_data);
+	set_irq_flags(irq, IRQF_VALID);
+
+	return 0;
+}
+
+static const struct irq_domain_ops iproc_msi_domain_ops = {
+	.map = iproc_msi_map,
+};
+
+static irqreturn_t iproc_msi_irq(int irq, void *data)
+{
+	struct iproc_pcie *pcie = data;
+	unsigned int eq, head, tail, num_events;
+
+	/* Do not handle INTx interrupt */
+	if ((readl(pcie->reg + SYS_RC_INTX_CSR) & SYS_RC_INTX_MASK) != 0)
+		return IRQ_NONE;
+
+	eq = irq - pcie->irqs[0];
+	BUG_ON(eq >= MAX_MSI_EQ);
+
+	irq = irq_find_mapping(pcie->msi.domain, eq);
+	head = readl(pcie->reg + SYS_EQ_HEAD_0_OFFSET + (eq * 8));
+	do {
+		tail = readl(pcie->reg + SYS_EQ_TAIL_0_OFFSET + (eq * 8));
+		tail &= SYS_EQ_TAIL_0_MASK;
+
+		num_events = (tail < head) ?
+			(64 + (tail - head)) : (tail - head);
+		if (!num_events)
+			break;
+
+		generic_handle_irq(irq);
+
+		head++;
+		head %= 64;
+		writel(head, pcie->reg + SYS_EQ_HEAD_0_OFFSET + (eq * 8));
+	} while (true);
+
+	return IRQ_HANDLED;
+}
+
+static int iproc_pcie_enable_msi(struct iproc_pcie *pcie)
+{
+	struct iproc_msi *msi = &pcie->msi;
+	struct device_node *np = pcie->dev->of_node;
+	int i, ret;
+	u32 val;
+
+	msi->pcie = pcie;
+	msi->chip.dev = pcie->dev;
+	msi->chip.setup_irq = iproc_msi_setup_irq;
+	msi->chip.teardown_irq = iproc_msi_teardown_irq;
+
+	msi->domain = irq_domain_add_linear(pcie->dev->of_node, MAX_IRQS,
+			&iproc_msi_domain_ops, &msi->chip);
+	if (!msi->domain) {
+		dev_err(pcie->dev, "failed to create IRQ domain\n");
+		return -ENOMEM;
+	}
+
+	for (i = 0; i < MAX_IRQS; i++) {
+		ret = devm_request_irq(pcie->dev, pcie->irqs[i],
+			iproc_msi_irq, IRQF_SHARED, "iproc-pcie", pcie);
+		if (ret < 0) {
+			dev_err(pcie->dev, "failed to request IRQ: %d\n",
+					pcie->irqs[i]);
+			goto err_rm_irq_domain;
+		}
+	}
+
+	msi->eq_page = __get_free_pages(GFP_KERNEL, 0);
+	if (!msi->eq_page) {
+		dev_err(pcie->dev,
+			"failed to allocate memory for MSI event queue\n");
+		ret = -ENOMEM;
+		goto err_rm_irq_domain;
+	}
+
+	msi->msi_page = __get_free_pages(GFP_KERNEL, 0);
+	if (!msi->msi_page) {
+		dev_err(pcie->dev,
+			"failed to allocate memory for MSI\n");
+		ret = -ENOMEM;
+		goto err_free_msi_eq_page;
+	}
+
+	writel(virt_to_phys((void *)msi->eq_page),
+			pcie->reg + SYS_EQ_PAGE_OFFSET);
+	writel(virt_to_phys((void *)msi->msi_page),
+			pcie->reg + SYS_MSI_PAGE_OFFSET);
+
+	for (i = 0; i < MAX_MSI_EQ; i++) {
+		/* enable MSI event queue and interrupt */
+		val = SYS_MSI_INTR_EN | SYS_MSI_INT_N_EVENT | SYS_MSI_EQ_EN;
+		writel(val, pcie->reg + SYS_MSI_CTRL_0_OFFSET + (i * 4));
+		/*
+		 * To support legacy platforms that require the MSI interrupt
+		 * enable register to be set explicitly
+		 */
+		if (of_find_property(np, "have-msi-inten-reg", NULL)) {
+			val = readl(pcie->reg + SYS_MSI_INTS_EN_OFFSET);
+			val |= (1 << i);
+			writel(val, pcie->reg + SYS_MSI_INTS_EN_OFFSET);
+		}
+	}
+
+	dev_info(pcie->dev, "MSI enabled\n");
+	return 0;
+
+err_free_msi_eq_page:
+	free_pages(msi->eq_page, 0);
+
+err_rm_irq_domain:
+	irq_domain_remove(msi->domain);
+	return ret;
+}
+
+static int __init iproc_pcie_probe(struct platform_device *pdev)
+{
+	struct iproc_pcie *pcie;
+	struct device_node *np = pdev->dev.of_node;
+	struct of_pci_range range;
+	struct of_pci_range_parser parser;
+	struct resource res, regs;
+	int i, ret;
+
+	pcie = devm_kzalloc(&pdev->dev, sizeof(struct iproc_pcie),
+			    GFP_KERNEL);
+	if (!pcie)
+		return -ENOMEM;
+
+	pcie->dev = &pdev->dev;
+	platform_set_drvdata(pdev, pcie);
+
+	if (of_pci_parse_bus_range(pdev->dev.of_node, &pcie->busn)) {
+		dev_err(&pdev->dev, "failed to parse bus-range property\n");
+		return -EINVAL;
+	}
+
+	/* PCIE controller registers */
+	ret = of_address_to_resource(np, 0, &regs);
+	if (ret) {
+		dev_err(pcie->dev, "unable to obtain device resources\n");
+		return -ENODEV;
+	}
+
+	pcie->reg = devm_ioremap(pcie->dev, regs.start, resource_size(&regs));
+	if (!pcie->reg) {
+		dev_err(pcie->dev, "unable to map device reg resources\n");
+		return -ENOMEM;
+	}
+
+	/* MDIO registers */
+	ret = of_address_to_resource(np, 1, &regs);
+	if (ret) {
+		dev_err(pcie->dev, "unable to obtain device resources\n");
+		return -ENODEV;
+	}
+
+	pcie->mii = devm_ioremap(pcie->dev, regs.start, resource_size(&regs));
+	if (!pcie->mii) {
+		dev_err(pcie->dev, "unable to map device mii resources\n");
+		return -ENOMEM;
+	}
+
+	for (i = 0; i < MAX_IRQS; i++) {
+		pcie->irqs[i] = irq_of_parse_and_map(np, i);
+		if (!pcie->irqs[i]) {
+			dev_err(pcie->dev, "unable to parse irq index:%d\n", i);
+			return -ENODEV;
+		}
+	}
+
+	if (of_property_read_u32(np, "phy-addr", &pcie->phy_addr)) {
+		dev_err(pcie->dev, "missing \"phy-addr\" property in DT\n");
+		return -EINVAL;
+	}
+
+	if (of_pci_range_parser_init(&parser, np)) {
+		dev_err(pcie->dev, "missing \"ranges\" property in DT\n");
+		return -EINVAL;
+	}
+
+	/* Get the PCI memory ranges from DT */
+	for_each_of_pci_range(&parser, &range) {
+		of_pci_range_to_resource(&range, np, &res);
+
+		switch (res.flags & IORESOURCE_TYPE_BITS) {
+		case IORESOURCE_IO:
+			memcpy(&pcie->io, &res, sizeof(res));
+			pcie->io.name = "I/O";
+			break;
+
+		case IORESOURCE_MEM:
+			memcpy(&pcie->mem, &res, sizeof(res));
+			pcie->mem.name = "MEM";
+			break;
+		}
+	}
+
+	if (IS_ENABLED(CONFIG_PCI_MSI)) {
+		ret = iproc_pcie_enable_msi(pcie);
+		if (ret < 0) {
+			dev_err(pcie->dev, "failed to enable MSI support\n");
+			return ret;
+		}
+	}
+
+	iproc_pcie_mii_phy_init(pcie, pcie->phy_addr);
+
+	iproc_pcie_reset(pcie);
+
+	ret = iproc_pcie_check_link(pcie);
+	if (ret) {
+		dev_err(pcie->dev, "no PCIe EP device detected\n");
+		return ret;
+	}
+
+	iproc_pcie_enable(pcie);
+	pci_assign_unassigned_resources();
+
+	return 0;
+}
+
+static const struct of_device_id iproc_pcie_of_match_table[] = {
+	{ .compatible = "brcm,iproc-pcie", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, iproc_pcie_of_match_table);
+
+static struct platform_driver iproc_pcie_driver = {
+	.driver = {
+		.owner = THIS_MODULE,
+		.name = "iproc-pcie",
+		.of_match_table =
+		   of_match_ptr(iproc_pcie_of_match_table),
+	},
+};
+
+static int __init iproc_pcie_init(void)
+{
+	return platform_driver_probe(&iproc_pcie_driver,
+			iproc_pcie_probe);
+}
+subsys_initcall(iproc_pcie_init);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom iPROC PCIe driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Ray Jui]

Add initial version of the Broadcom iProc PCIe driver. This driver
has been tested on NSP and Cygnus and is expected to work on all iProc
family of SoCs that deploys the same PCIe host controller

The driver also supports MSI

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/pci/host/Kconfig      |    9 +
 drivers/pci/host/Makefile     |    1 +
 drivers/pci/host/pcie-iproc.c |  896 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 906 insertions(+)
 create mode 100644 drivers/pci/host/pcie-iproc.c

diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
index c4b6568..22322e1 100644
--- a/drivers/pci/host/Kconfig
+++ b/drivers/pci/host/Kconfig
@@ -102,4 +102,13 @@ config PCI_LAYERSCAPE
 	help
 	  Say Y here if you want PCIe controller support on Layerscape SoCs.
 
+config PCIE_IPROC
+	bool "Broadcom iProc PCIe controller"
+	depends on ARCH_BCM_IPROC
+	help
+	  Say Y here if you want to enable the PCIe controller driver support
+	  on Broadcom's iProc family of SoCs.
+
+	  MSI is also supported in the driver.
+
 endmenu
diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
index 44c2699..1f5e9d2 100644
--- a/drivers/pci/host/Makefile
+++ b/drivers/pci/host/Makefile
@@ -12,3 +12,4 @@ obj-$(CONFIG_PCI_KEYSTONE) += pci-keystone-dw.o pci-keystone.o
 obj-$(CONFIG_PCIE_XILINX) += pcie-xilinx.o
 obj-$(CONFIG_PCI_XGENE) += pci-xgene.o
 obj-$(CONFIG_PCI_LAYERSCAPE) += pci-layerscape.o
+obj-$(CONFIG_PCIE_IPROC) += pcie-iproc.o
diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
new file mode 100644
index 0000000..bd9f01c
--- /dev/null
+++ b/drivers/pci/host/pcie-iproc.c
@@ -0,0 +1,896 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/msi.h>
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/mbus.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/of_address.h>
+#include <linux/of_pci.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+
+/* max number of MSI event queues */
+#define MAX_MSI_EQ 6
+#define MAX_IRQS MAX_MSI_EQ
+
+#define MDIO_TIMEOUT_USEC 100
+
+#define OPCODE_WRITE 1
+#define OPCODE_READ  2
+
+#define MII_TA_VAL 2
+#define MII_MDCDIV 62
+
+#define MII_MGMT_CTRL_OFFSET         0x000
+#define MII_MGMT_CTRL_MDCDIV_SHIFT   0
+#define MII_MGMT_CTRL_PRE_SHIFT      7
+#define MII_MGMT_CTRL_BUSY_SHIFT     8
+#define MII_MGMT_CTRL_EXT_SHIFT      9
+#define MII_MGMT_CTRL_BTP_SHIFT      10
+
+#define MII_MGMT_CMD_DATA_OFFSET     0x004
+#define MII_MGMT_CMD_DATA_SHIFT      0
+#define MII_MGMT_CMD_TA_SHIFT        16
+#define MII_MGMT_CMD_RA_SHIFT        18
+#define MII_MGMT_CMD_PA_SHIFT        23
+#define MII_MGMT_CMD_OP_SHIFT        28
+#define MII_MGMT_CMD_SB_SHIFT        30
+#define MII_MGMT_CMD_DATA_MASK       0xFFFF
+
+#define CLK_CONTROL_OFFSET           0x000
+#define EP_PERST_SOURCE_SELECT_SHIFT 2
+#define EP_PERST_SOURCE_SELECT       (1 << EP_PERST_SOURCE_SELECT_SHIFT)
+#define EP_MODE_SURVIVE_PERST_SHIFT  1
+#define EP_MODE_SURVIVE_PERST        (1 << EP_MODE_SURVIVE_PERST_SHIFT)
+#define RC_PCIE_RST_OUTPUT_SHIFT     0
+#define RC_PCIE_RST_OUTPUT           (1 << RC_PCIE_RST_OUTPUT_SHIFT)
+
+#define CFG_IND_ADDR_OFFSET          0x120
+#define CFG_IND_ADDR_MASK            0x00001FFC
+
+#define CFG_IND_DATA_OFFSET          0x124
+
+#define CFG_ADDR_OFFSET              0x1F8
+#define CFG_ADDR_BUS_NUM_SHIFT       20
+#define CFG_ADDR_BUS_NUM_MASK        0x0FF00000
+#define CFG_ADDR_DEV_NUM_SHIFT       15
+#define CFG_ADDR_DEV_NUM_MASK        0x000F8000
+#define CFG_ADDR_FUNC_NUM_SHIFT      12
+#define CFG_ADDR_FUNC_NUM_MASK       0x00007000
+#define CFG_ADDR_REG_NUM_SHIFT       2
+#define CFG_ADDR_REG_NUM_MASK        0x00000FFC
+#define CFG_ADDR_CFG_TYPE_SHIFT      0
+#define CFG_ADDR_CFG_TYPE_MASK       0x00000003
+
+#define CFG_DATA_OFFSET              0x1FC
+
+#define SYS_EQ_PAGE_OFFSET           0x200
+#define SYS_MSI_PAGE_OFFSET          0x204
+
+#define SYS_MSI_INTS_EN_OFFSET       0x208
+
+#define SYS_MSI_CTRL_0_OFFSET        0x210
+#define SYS_MSI_INTR_EN_SHIFT        11
+#define SYS_MSI_INTR_EN              (1 << SYS_MSI_INTR_EN_SHIFT)
+#define SYS_MSI_INT_N_EVENT_SHIFT    1
+#define SYS_MSI_INT_N_EVENT          (1 << SYS_MSI_INT_N_EVENT_SHIFT)
+#define SYS_MSI_EQ_EN_SHIFT          0
+#define SYS_MSI_EQ_EN                (1 << SYS_MSI_EQ_EN_SHIFT)
+
+#define SYS_EQ_HEAD_0_OFFSET         0x250
+#define SYS_EQ_TAIL_0_OFFSET         0x254
+#define SYS_EQ_TAIL_0_MASK           0x3F
+
+#define SYS_RC_INTX_EN               0x330
+#define SYS_RC_INTX_MASK             0xF
+
+#define SYS_RC_INTX_CSR              0x334
+#define SYS_RC_INTX_MASK             0xF
+
+#define OARR_0_OFFSET                0xD20
+#define OAAR_0_ADDR_MASK             0xF0000000
+#define OAAR_0_VALID_SHIFT           0
+#define OAAR_0_VALID                 (1 << OAAR_0_VALID_SHIFT)
+#define OAAR_0_UPPER_OFFSET          0xD24
+#define OAAR_0_UPPER_ADDR_MASK       0x0000000F
+
+#define PCIE_SYS_RC_INTX_EN_OFFSET   0x330
+
+#define OMAP_0_LOWER_OFFSET          0xD40
+#define OMAP_0_LOWER_ADDR_MASK       0xF0000000
+#define OMAP_0_UPPER_OFFSET          0x0D44
+
+#define PCIE_LINK_STATUS_OFFSET      0xF0C
+#define PCIE_PHYLINKUP_SHITF         3
+#define PCIE_PHYLINKUP               (1 << PCIE_PHYLINKUP_SHITF)
+
+#define STRAP_STATUS_OFFSET          0xF10
+#define STRAP_1LANE_SHIFT            2
+#define STRAP_1LANE                  (1 << STRAP_1LANE_SHIFT)
+#define STRAP_IF_ENABLE_SHIFT        1
+#define STRAP_IF_ENABLE              (1 << STRAP_IF_ENABLE_SHIFT)
+#define STRAP_RC_MODE_SHIFT          0
+#define STRAP_RC_MODE                (1 << STRAP_RC_MODE_SHIFT)
+
+struct iproc_pcie;
+
+/**
+ * iProc MSI
+ * @pcie: pointer to the iProc PCIe data structure
+ * @irq_in_use: bitmap of MSI IRQs that are in use
+ * @domain: MSI IRQ domain
+ * @chip: MSI controller
+ * @eq_page: memory page to store the iProc MSI event queue
+ * @msi_page: memory page for MSI posted writes
+ */
+struct iproc_msi {
+	struct iproc_pcie *pcie;
+	DECLARE_BITMAP(irq_in_use, MAX_IRQS);
+	struct irq_domain *domain;
+	struct msi_controller chip;
+	unsigned long eq_page;
+	unsigned long msi_page;
+};
+
+/**
+ * iProc PCIe
+ * @dev: pointer to the device
+ * @mii: MII/MDIO management I/O register base
+ * @reg: PCIe I/O register base
+ * @io: PCIe I/O resource
+ * @mem: PCIe memory resource
+ * @busn: PCIe bus resource
+ * @phy_addr: MIDO PHY address
+ * @irqs: Array that stores IRQs
+ * @msi: MSI related info
+ */
+struct iproc_pcie {
+	struct device *dev;
+
+	void __iomem *mii;
+	void __iomem *reg;
+
+	struct resource io;
+	struct resource mem;
+	struct resource busn;
+
+	u32 phy_addr;
+	int irqs[MAX_IRQS];
+
+	struct iproc_msi msi;
+};
+
+static inline int mdio_wait_idle(struct iproc_pcie *pcie)
+{
+	int timeout = MDIO_TIMEOUT_USEC;
+
+	while (readl(pcie->mii + MII_MGMT_CTRL_OFFSET) &
+			(1 << MII_MGMT_CTRL_BUSY_SHIFT)) {
+		udelay(1);
+		if (timeout-- <= 0)
+			return -EBUSY;
+	}
+	return 0;
+}
+
+static void mdio_init(struct iproc_pcie *pcie)
+{
+	u32 val;
+
+	val = MII_MDCDIV << MII_MGMT_CTRL_MDCDIV_SHIFT;
+	val |= (1 << MII_MGMT_CTRL_PRE_SHIFT);
+	writel(val, pcie->mii + MII_MGMT_CTRL_OFFSET);
+
+	WARN_ON(mdio_wait_idle(pcie));
+}
+
+static u16 mdio_read(struct iproc_pcie *pcie, unsigned int phy_addr,
+		unsigned int reg_addr)
+{
+	u32 val;
+
+	WARN_ON(mdio_wait_idle(pcie));
+
+	val = (MII_TA_VAL << MII_MGMT_CMD_TA_SHIFT);
+	val |= (reg_addr << MII_MGMT_CMD_RA_SHIFT);
+	val |= (phy_addr << MII_MGMT_CMD_PA_SHIFT);
+	val |= (OPCODE_READ << MII_MGMT_CMD_OP_SHIFT);
+	val |= (1 << MII_MGMT_CMD_SB_SHIFT);
+	writel(val, pcie->mii + MII_MGMT_CMD_DATA_OFFSET);
+
+	WARN_ON(mdio_wait_idle(pcie));
+
+	val = readl(pcie->mii + MII_MGMT_CMD_DATA_OFFSET) &
+		MII_MGMT_CMD_DATA_MASK;
+
+	return (u16)val;
+}
+
+static void mdio_write(struct iproc_pcie *pcie, unsigned int phy_addr,
+		unsigned int reg_addr, u16 wr_data)
+{
+	u32 val;
+
+	WARN_ON(mdio_wait_idle(pcie));
+
+	val = (MII_TA_VAL << MII_MGMT_CMD_TA_SHIFT);
+	val |= (reg_addr << MII_MGMT_CMD_RA_SHIFT);
+	val |= (phy_addr << MII_MGMT_CMD_PA_SHIFT);
+	val |= (OPCODE_WRITE << MII_MGMT_CMD_OP_SHIFT);
+	val |= (1 << MII_MGMT_CMD_SB_SHIFT);
+	val |= ((u32)wr_data & MII_MGMT_CMD_DATA_MASK);
+	writel(val, pcie->mii + MII_MGMT_CMD_DATA_OFFSET);
+
+	WARN_ON(mdio_wait_idle(pcie));
+}
+
+#define PCIE_PHY_BLK_ADDR_OFFSET 0x1F
+#define PCIE_PHY_BLK_ADDR_MASK   0xFFF0
+#define PCIE_PHY_REG_ADDR_MASK   0xF
+static u16 iproc_pcie_phy_reg_read(struct iproc_pcie *pcie,
+		unsigned int phy_addr, unsigned int reg_addr)
+{
+	u16 val;
+
+	mdio_write(pcie, phy_addr, PCIE_PHY_BLK_ADDR_OFFSET,
+			reg_addr & PCIE_PHY_BLK_ADDR_MASK);
+	val = mdio_read(pcie, phy_addr, reg_addr & PCIE_PHY_REG_ADDR_MASK);
+
+	dev_dbg(pcie->dev, "phy rd: phy: 0x%0x reg: 0x%4x data: 0x%4x\n",
+			phy_addr, reg_addr, val);
+
+	return val;
+}
+
+static void iproc_pcie_phy_reg_write(struct iproc_pcie *pcie,
+		unsigned int phy_addr, unsigned int reg_addr, u16 val)
+{
+	mdio_write(pcie, phy_addr, PCIE_PHY_BLK_ADDR_OFFSET,
+			reg_addr & PCIE_PHY_BLK_ADDR_MASK);
+	mdio_write(pcie, phy_addr, reg_addr & PCIE_PHY_REG_ADDR_MASK, val);
+
+	dev_dbg(pcie->dev, "phy wr: phy: 0x%0x reg: 0x%4x data: 0x%4x\n",
+			phy_addr, reg_addr, val);
+}
+
+static inline struct iproc_pcie *sys_to_pcie(struct pci_sys_data *sys)
+{
+	return sys->private_data;
+}
+
+static void iproc_pcie_reset(struct iproc_pcie *pcie)
+{
+	u32 val;
+
+	/* send a downstream reset */
+	val = EP_MODE_SURVIVE_PERST | RC_PCIE_RST_OUTPUT;
+	writel(val, pcie->reg + CLK_CONTROL_OFFSET);
+	udelay(250);
+	val &= ~EP_MODE_SURVIVE_PERST;
+	writel(val, pcie->reg + CLK_CONTROL_OFFSET);
+	mdelay(250);
+}
+
+#define INVALID_ACCESS_OFFSET 0xFFFFFFFF
+static u32 iproc_pcie_conf_access(struct iproc_pcie *pcie, struct pci_bus *bus,
+		unsigned int devfn, int where)
+{
+	int busno = bus->number;
+	int slot = PCI_SLOT(devfn);
+	int fn = PCI_FUNC(devfn);
+	u32 val;
+
+	/* root complex access */
+	if (busno == 0) {
+		if (slot)
+			return INVALID_ACCESS_OFFSET;
+		writel(where & CFG_IND_ADDR_MASK,
+				pcie->reg + CFG_IND_ADDR_OFFSET);
+		return CFG_IND_DATA_OFFSET;
+	}
+
+	if (fn > 1)
+		return INVALID_ACCESS_OFFSET;
+
+	/* access of EP device */
+	val = (bus->number << CFG_ADDR_BUS_NUM_SHIFT) |
+		(PCI_SLOT(devfn) << CFG_ADDR_DEV_NUM_SHIFT) |
+		(PCI_FUNC(devfn) << CFG_ADDR_FUNC_NUM_SHIFT) |
+		(where & CFG_ADDR_REG_NUM_MASK) |
+		(1 & CFG_ADDR_CFG_TYPE_MASK);
+	writel(val, pcie->reg + CFG_ADDR_OFFSET);
+
+	return CFG_DATA_OFFSET;
+}
+
+#define INVALID_CFG_RD 0xFFFFFFFF
+static int iproc_pci_read_conf(struct pci_bus *bus, unsigned int devfn,
+		int where, int size, u32 *val)
+{
+	u32 offset;
+	struct iproc_pcie *pcie = sys_to_pcie(bus->sysdata);
+
+	*val = INVALID_CFG_RD;
+
+	if (size != 1 && size != 2 && size != 4)
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+	else if ((size == 2) && (where & 1))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+	else if ((size == 4) && (where & 3))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	offset = iproc_pcie_conf_access(pcie, bus, devfn, where);
+	if (offset == INVALID_ACCESS_OFFSET)
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	*val = readl(pcie->reg + offset);
+
+	switch (size) {
+	case 4:
+		/* return raw data */
+		break;
+	case 2:
+		*val = (*val >> (8 * (where & 3))) & 0xFFFF;
+		break;
+	case 1:
+		*val = (*val >> (8 * (where & 3))) & 0xFF;
+		break;
+	default:
+		BUG_ON(1);
+	}
+
+	dev_dbg(pcie->dev, "conf rd: busn=%d devfn=%d where=%d size=%d val=0x%08x\n",
+			bus->number, devfn, where, size, *val);
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int iproc_pci_write_conf(struct pci_bus *bus, unsigned int devfn,
+		int where, int size, u32 val)
+{
+	int shift;
+	u32 offset, data;
+	struct iproc_pcie *pcie = sys_to_pcie(bus->sysdata);
+
+	if (size != 1 && size != 2 && size != 4)
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+	else if ((size == 2) && (where & 1))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+	else if ((size == 4) && (where & 3))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	offset = iproc_pcie_conf_access(pcie, bus, devfn, where);
+	if (offset == INVALID_ACCESS_OFFSET)
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	data = readl(pcie->reg + offset);
+
+	switch (size) {
+	case 4:
+		data = val;
+		break;
+	case 2:
+		shift = 8 * (where & 2);
+		data &= ~(0xFFFF << shift);
+		data |= ((val & 0xFFFF) << shift);
+		break;
+	case 1:
+		shift = 8 * (where & 3);
+		data &= ~(0xFF << shift);
+		data |= ((val & 0xFF) << shift);
+		break;
+	default:
+		BUG_ON(1);
+	}
+
+	writel(data, pcie->reg + offset);
+
+	dev_dbg(pcie->dev,
+		"config wr: busn=%d devfn=%d where=%d size=%d data=0x%08x\n",
+		bus->number, devfn, where, size, data);
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static struct pci_ops iproc_pcie_ops = {
+	.read = iproc_pci_read_conf,
+	.write = iproc_pci_write_conf,
+};
+
+static int iproc_pcie_check_link(struct iproc_pcie *pcie)
+{
+	int ret;
+	u8 nlw;
+	u16 pos, tmp16;
+	u32 val;
+	struct pci_sys_data sys;
+	struct pci_bus bus;
+
+	val = readl(pcie->reg + PCIE_LINK_STATUS_OFFSET);
+	dev_dbg(pcie->dev, "link status: 0x%08x\n", val);
+
+	val = readl(pcie->reg + STRAP_STATUS_OFFSET);
+	dev_dbg(pcie->dev, "strap status: 0x%08x\n", val);
+
+	memset(&sys, 0, sizeof(sys));
+	memset(&bus, 0, sizeof(bus));
+
+	bus.number = 0;
+	bus.ops = &iproc_pcie_ops;
+	bus.sysdata = &sys;
+	sys.private_data = pcie;
+
+	ret = iproc_pci_read_conf(&bus, 0, PCI_HEADER_TYPE, 1, &val);
+	if (ret != PCIBIOS_SUCCESSFUL || val != PCI_HEADER_TYPE_BRIDGE) {
+		dev_err(pcie->dev, "in EP mode, val=0x08%x\n", val);
+		return -EFAULT;
+	}
+
+	/*
+	 * Under RC mode, write to function specific register 0x43c, to change
+	 * the CLASS code in configuration space
+	 *
+	 * After this modification, the CLASS code in configuration space would
+	 * be read as PCI_CLASS_BRIDGE_PCI(0x0604)
+	 */
+#define PCI_BRIDGE_CTRL_REG_OFFSET 0x43C
+#define PCI_CLASS_BRIDGE_PCI_MASK  0xFF0000FF
+	pci_bus_read_config_dword(&bus, 0, PCI_BRIDGE_CTRL_REG_OFFSET, &val);
+	val = (val & PCI_CLASS_BRIDGE_PCI_MASK) | (PCI_CLASS_BRIDGE_PCI << 8);
+	pci_bus_write_config_dword(&bus, 0, PCI_BRIDGE_CTRL_REG_OFFSET, val);
+
+	/* check link status to see if link is active */
+	pos = pci_bus_find_capability(&bus, 0, PCI_CAP_ID_EXP);
+	pci_bus_read_config_word(&bus, 0, pos + PCI_EXP_LNKSTA, &tmp16);
+	tmp16 &= PCI_EXP_LNKSTA_DLLLA;
+	nlw = (tmp16 & PCI_EXP_LNKSTA_NLW) >> PCI_EXP_LNKSTA_NLW_SHIFT;
+
+	if (nlw == 0) {
+		/* try GEN 1 link speed */
+#define PCI_LINK_STATUS_CTRL_2_OFFSET 0xDC
+#define PCI_TARGET_LINK_SPEED_MASK    0xF
+#define PCI_TARGET_LINK_SPEED_GEN2    0x2
+#define PCI_TARGET_LINK_SPEED_GEN1    0x1
+		pci_bus_read_config_dword(&bus, 0,
+				PCI_LINK_STATUS_CTRL_2_OFFSET, &val);
+		if ((val & PCI_TARGET_LINK_SPEED_MASK) ==
+				PCI_TARGET_LINK_SPEED_GEN2) {
+			val &= ~PCI_TARGET_LINK_SPEED_MASK;
+			val |= PCI_TARGET_LINK_SPEED_GEN1;
+			pci_bus_write_config_dword(&bus, 0,
+					PCI_LINK_STATUS_CTRL_2_OFFSET, val);
+			pci_bus_read_config_dword(&bus, 0,
+					PCI_LINK_STATUS_CTRL_2_OFFSET, &val);
+			mdelay(100);
+
+			pos = pci_bus_find_capability(&bus, 0, PCI_CAP_ID_EXP);
+			pci_bus_read_config_word(&bus, 0, pos + PCI_EXP_LNKSTA,
+					&tmp16);
+			nlw = (tmp16 & PCI_EXP_LNKSTA_NLW) >>
+				PCI_EXP_LNKSTA_NLW_SHIFT;
+		}
+	}
+
+	dev_info(pcie->dev, "link: %s\n", nlw ? "UP" : "DOWN");
+
+	return nlw ? 0 : -ENODEV;
+}
+
+static int iproc_pcie_setup(int nr, struct pci_sys_data *sys)
+{
+	struct iproc_pcie *pcie = sys_to_pcie(sys);
+
+	pci_add_resource(&sys->resources, &pcie->io);
+	pci_add_resource(&sys->resources, &pcie->mem);
+	pci_add_resource(&sys->resources, &pcie->busn);
+
+	return 1;
+}
+
+static struct pci_bus *iproc_pcie_scan_bus(int nr, struct pci_sys_data *sys)
+{
+	struct iproc_pcie *pcie = sys->private_data;
+	struct pci_bus *bus;
+
+	bus = pci_create_root_bus(pcie->dev, sys->busnr, &iproc_pcie_ops, sys,
+			&sys->resources);
+	if (!bus)
+		return NULL;
+
+	if (IS_ENABLED(CONFIG_PCI_MSI))
+		bus->msi = &pcie->msi.chip;
+
+	pci_scan_child_bus(bus);
+
+	return bus;
+}
+
+static int iproc_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+{
+	struct iproc_pcie *pcie = sys_to_pcie(dev->sysdata);
+
+	/* need to use the 5th IRQ for INTx */
+	return pcie->irqs[4];
+}
+
+static struct hw_pci hw;
+
+static void iproc_pcie_enable(struct iproc_pcie *pcie)
+{
+	hw.nr_controllers = 1;
+	hw.private_data = (void **)&pcie;
+	hw.setup = iproc_pcie_setup;
+	hw.scan = iproc_pcie_scan_bus;
+	hw.map_irq = iproc_pcie_map_irq;
+	hw.ops = &iproc_pcie_ops;
+
+	/* enable root complex INTX */
+	writel(SYS_RC_INTX_MASK, pcie->reg + SYS_RC_INTX_EN);
+
+	pci_common_init_dev(pcie->dev, &hw);
+#ifdef CONFIG_PCI_DOMAINS
+	hw.domain++;
+#endif
+}
+
+#define PCIE_PHY_REG_ADDR 0x2103
+#define PCIE_PHY_DATA     0x2B1C
+static void iproc_pcie_mii_phy_init(struct iproc_pcie *pcie, u32 phy_addr)
+{
+	unsigned int reg_addr;
+	u16 val;
+
+	mdio_init(pcie);
+
+	reg_addr = PCIE_PHY_REG_ADDR;
+	val = PCIE_PHY_DATA;
+	iproc_pcie_phy_reg_write(pcie, phy_addr, reg_addr, val);
+	val = iproc_pcie_phy_reg_read(pcie, phy_addr, reg_addr);
+	dev_info(pcie->dev, "phy: 0x%x reg: 0x%4x val: 0x%4x\n", phy_addr,
+			reg_addr, val);
+}
+
+static inline struct iproc_msi *to_iproc_msi(struct msi_controller *chip)
+{
+	return container_of(chip, struct iproc_msi, chip);
+}
+
+static int iproc_msi_irq_assign(struct iproc_msi *chip)
+{
+	int msi;
+
+	msi = find_first_zero_bit(chip->irq_in_use, MAX_IRQS);
+	if (msi < MAX_IRQS)
+		set_bit(msi, chip->irq_in_use);
+	else
+		msi = -ENOSPC;
+
+	return msi;
+}
+
+static void iproc_msi_irq_free(struct iproc_msi *chip, unsigned long irq)
+{
+	clear_bit(irq, chip->irq_in_use);
+}
+
+static int iproc_msi_setup_irq(struct msi_controller *chip,
+		struct pci_dev *pdev, struct msi_desc *desc)
+{
+	struct iproc_msi *msi = to_iproc_msi(chip);
+	struct iproc_pcie *pcie = msi->pcie;
+	struct msi_msg msg;
+	unsigned int irq;
+	int hwirq;
+
+	hwirq = iproc_msi_irq_assign(msi);
+	if (hwirq < 0)
+		return hwirq;
+
+	irq = irq_create_mapping(msi->domain, hwirq);
+	if (!irq) {
+		iproc_msi_irq_free(msi, hwirq);
+		return -EINVAL;
+	}
+
+	dev_dbg(pcie->dev, "mapped irq:%d\n", irq);
+
+	irq_set_msi_desc(irq, desc);
+
+	msg.address_lo = virt_to_phys((void *)msi->msi_page) | (hwirq * 4);
+	msg.address_hi = 0x0;
+	msg.data = hwirq;
+
+	write_msi_msg(irq, &msg);
+
+	return 0;
+}
+
+static void iproc_msi_teardown_irq(struct msi_controller *chip,
+		unsigned int irq)
+{
+	struct iproc_msi *msi = to_iproc_msi(chip);
+	struct irq_data *data = irq_get_irq_data(irq);
+
+	iproc_msi_irq_free(msi, data->hwirq);
+}
+
+static struct irq_chip iproc_msi_irq_chip = {
+	.name = "iProc PCIe MSI",
+	.irq_enable = unmask_msi_irq,
+	.irq_disable = mask_msi_irq,
+	.irq_mask = mask_msi_irq,
+	.irq_unmask = unmask_msi_irq,
+};
+
+static int iproc_msi_map(struct irq_domain *domain, unsigned int irq,
+			irq_hw_number_t hwirq)
+{
+	irq_set_chip_and_handler(irq, &iproc_msi_irq_chip, handle_simple_irq);
+	irq_set_chip_data(irq, domain->host_data);
+	set_irq_flags(irq, IRQF_VALID);
+
+	return 0;
+}
+
+static const struct irq_domain_ops iproc_msi_domain_ops = {
+	.map = iproc_msi_map,
+};
+
+static irqreturn_t iproc_msi_irq(int irq, void *data)
+{
+	struct iproc_pcie *pcie = data;
+	unsigned int eq, head, tail, num_events;
+
+	/* Do not handle INTx interrupt */
+	if ((readl(pcie->reg + SYS_RC_INTX_CSR) & SYS_RC_INTX_MASK) != 0)
+		return IRQ_NONE;
+
+	eq = irq - pcie->irqs[0];
+	BUG_ON(eq >= MAX_MSI_EQ);
+
+	irq = irq_find_mapping(pcie->msi.domain, eq);
+	head = readl(pcie->reg + SYS_EQ_HEAD_0_OFFSET + (eq * 8));
+	do {
+		tail = readl(pcie->reg + SYS_EQ_TAIL_0_OFFSET + (eq * 8));
+		tail &= SYS_EQ_TAIL_0_MASK;
+
+		num_events = (tail < head) ?
+			(64 + (tail - head)) : (tail - head);
+		if (!num_events)
+			break;
+
+		generic_handle_irq(irq);
+
+		head++;
+		head %= 64;
+		writel(head, pcie->reg + SYS_EQ_HEAD_0_OFFSET + (eq * 8));
+	} while (true);
+
+	return IRQ_HANDLED;
+}
+
+static int iproc_pcie_enable_msi(struct iproc_pcie *pcie)
+{
+	struct iproc_msi *msi = &pcie->msi;
+	struct device_node *np = pcie->dev->of_node;
+	int i, ret;
+	u32 val;
+
+	msi->pcie = pcie;
+	msi->chip.dev = pcie->dev;
+	msi->chip.setup_irq = iproc_msi_setup_irq;
+	msi->chip.teardown_irq = iproc_msi_teardown_irq;
+
+	msi->domain = irq_domain_add_linear(pcie->dev->of_node, MAX_IRQS,
+			&iproc_msi_domain_ops, &msi->chip);
+	if (!msi->domain) {
+		dev_err(pcie->dev, "failed to create IRQ domain\n");
+		return -ENOMEM;
+	}
+
+	for (i = 0; i < MAX_IRQS; i++) {
+		ret = devm_request_irq(pcie->dev, pcie->irqs[i],
+			iproc_msi_irq, IRQF_SHARED, "iproc-pcie", pcie);
+		if (ret < 0) {
+			dev_err(pcie->dev, "failed to request IRQ: %d\n",
+					pcie->irqs[i]);
+			goto err_rm_irq_domain;
+		}
+	}
+
+	msi->eq_page = __get_free_pages(GFP_KERNEL, 0);
+	if (!msi->eq_page) {
+		dev_err(pcie->dev,
+			"failed to allocate memory for MSI event queue\n");
+		ret = -ENOMEM;
+		goto err_rm_irq_domain;
+	}
+
+	msi->msi_page = __get_free_pages(GFP_KERNEL, 0);
+	if (!msi->msi_page) {
+		dev_err(pcie->dev,
+			"failed to allocate memory for MSI\n");
+		ret = -ENOMEM;
+		goto err_free_msi_eq_page;
+	}
+
+	writel(virt_to_phys((void *)msi->eq_page),
+			pcie->reg + SYS_EQ_PAGE_OFFSET);
+	writel(virt_to_phys((void *)msi->msi_page),
+			pcie->reg + SYS_MSI_PAGE_OFFSET);
+
+	for (i = 0; i < MAX_MSI_EQ; i++) {
+		/* enable MSI event queue and interrupt */
+		val = SYS_MSI_INTR_EN | SYS_MSI_INT_N_EVENT | SYS_MSI_EQ_EN;
+		writel(val, pcie->reg + SYS_MSI_CTRL_0_OFFSET + (i * 4));
+		/*
+		 * To support legacy platforms that require the MSI interrupt
+		 * enable register to be set explicitly
+		 */
+		if (of_find_property(np, "have-msi-inten-reg", NULL)) {
+			val = readl(pcie->reg + SYS_MSI_INTS_EN_OFFSET);
+			val |= (1 << i);
+			writel(val, pcie->reg + SYS_MSI_INTS_EN_OFFSET);
+		}
+	}
+
+	dev_info(pcie->dev, "MSI enabled\n");
+	return 0;
+
+err_free_msi_eq_page:
+	free_pages(msi->eq_page, 0);
+
+err_rm_irq_domain:
+	irq_domain_remove(msi->domain);
+	return ret;
+}
+
+static int __init iproc_pcie_probe(struct platform_device *pdev)
+{
+	struct iproc_pcie *pcie;
+	struct device_node *np = pdev->dev.of_node;
+	struct of_pci_range range;
+	struct of_pci_range_parser parser;
+	struct resource res, regs;
+	int i, ret;
+
+	pcie = devm_kzalloc(&pdev->dev, sizeof(struct iproc_pcie),
+			    GFP_KERNEL);
+	if (!pcie)
+		return -ENOMEM;
+
+	pcie->dev = &pdev->dev;
+	platform_set_drvdata(pdev, pcie);
+
+	if (of_pci_parse_bus_range(pdev->dev.of_node, &pcie->busn)) {
+		dev_err(&pdev->dev, "failed to parse bus-range property\n");
+		return -EINVAL;
+	}
+
+	/* PCIE controller registers */
+	ret = of_address_to_resource(np, 0, &regs);
+	if (ret) {
+		dev_err(pcie->dev, "unable to obtain device resources\n");
+		return -ENODEV;
+	}
+
+	pcie->reg = devm_ioremap(pcie->dev, regs.start, resource_size(&regs));
+	if (!pcie->reg) {
+		dev_err(pcie->dev, "unable to map device reg resources\n");
+		return -ENOMEM;
+	}
+
+	/* MDIO registers */
+	ret = of_address_to_resource(np, 1, &regs);
+	if (ret) {
+		dev_err(pcie->dev, "unable to obtain device resources\n");
+		return -ENODEV;
+	}
+
+	pcie->mii = devm_ioremap(pcie->dev, regs.start, resource_size(&regs));
+	if (!pcie->mii) {
+		dev_err(pcie->dev, "unable to map device mii resources\n");
+		return -ENOMEM;
+	}
+
+	for (i = 0; i < MAX_IRQS; i++) {
+		pcie->irqs[i] = irq_of_parse_and_map(np, i);
+		if (!pcie->irqs[i]) {
+			dev_err(pcie->dev, "unable to parse irq index:%d\n", i);
+			return -ENODEV;
+		}
+	}
+
+	if (of_property_read_u32(np, "phy-addr", &pcie->phy_addr)) {
+		dev_err(pcie->dev, "missing \"phy-addr\" property in DT\n");
+		return -EINVAL;
+	}
+
+	if (of_pci_range_parser_init(&parser, np)) {
+		dev_err(pcie->dev, "missing \"ranges\" property in DT\n");
+		return -EINVAL;
+	}
+
+	/* Get the PCI memory ranges from DT */
+	for_each_of_pci_range(&parser, &range) {
+		of_pci_range_to_resource(&range, np, &res);
+
+		switch (res.flags & IORESOURCE_TYPE_BITS) {
+		case IORESOURCE_IO:
+			memcpy(&pcie->io, &res, sizeof(res));
+			pcie->io.name = "I/O";
+			break;
+
+		case IORESOURCE_MEM:
+			memcpy(&pcie->mem, &res, sizeof(res));
+			pcie->mem.name = "MEM";
+			break;
+		}
+	}
+
+	if (IS_ENABLED(CONFIG_PCI_MSI)) {
+		ret = iproc_pcie_enable_msi(pcie);
+		if (ret < 0) {
+			dev_err(pcie->dev, "failed to enable MSI support\n");
+			return ret;
+		}
+	}
+
+	iproc_pcie_mii_phy_init(pcie, pcie->phy_addr);
+
+	iproc_pcie_reset(pcie);
+
+	ret = iproc_pcie_check_link(pcie);
+	if (ret) {
+		dev_err(pcie->dev, "no PCIe EP device detected\n");
+		return ret;
+	}
+
+	iproc_pcie_enable(pcie);
+	pci_assign_unassigned_resources();
+
+	return 0;
+}
+
+static const struct of_device_id iproc_pcie_of_match_table[] = {
+	{ .compatible = "brcm,iproc-pcie", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, iproc_pcie_of_match_table);
+
+static struct platform_driver iproc_pcie_driver = {
+	.driver = {
+		.owner = THIS_MODULE,
+		.name = "iproc-pcie",
+		.of_match_table =
+		   of_match_ptr(iproc_pcie_of_match_table),
+	},
+};
+
+static int __init iproc_pcie_init(void)
+{
+	return platform_driver_probe(&iproc_pcie_driver,
+			iproc_pcie_probe);
+}
+subsys_initcall(iproc_pcie_init);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom iPROC PCIe driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Ray Jui]

Add initial version of the Broadcom iProc PCIe driver. This driver
has been tested on NSP and Cygnus and is expected to work on all iProc
family of SoCs that deploys the same PCIe host controller

The driver also supports MSI

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/pci/host/Kconfig      |    9 +
 drivers/pci/host/Makefile     |    1 +
 drivers/pci/host/pcie-iproc.c |  896 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 906 insertions(+)
 create mode 100644 drivers/pci/host/pcie-iproc.c

diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
index c4b6568..22322e1 100644
--- a/drivers/pci/host/Kconfig
+++ b/drivers/pci/host/Kconfig
@@ -102,4 +102,13 @@ config PCI_LAYERSCAPE
 	help
 	  Say Y here if you want PCIe controller support on Layerscape SoCs.
 
+config PCIE_IPROC
+	bool "Broadcom iProc PCIe controller"
+	depends on ARCH_BCM_IPROC
+	help
+	  Say Y here if you want to enable the PCIe controller driver support
+	  on Broadcom's iProc family of SoCs.
+
+	  MSI is also supported in the driver.
+
 endmenu
diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
index 44c2699..1f5e9d2 100644
--- a/drivers/pci/host/Makefile
+++ b/drivers/pci/host/Makefile
@@ -12,3 +12,4 @@ obj-$(CONFIG_PCI_KEYSTONE) += pci-keystone-dw.o pci-keystone.o
 obj-$(CONFIG_PCIE_XILINX) += pcie-xilinx.o
 obj-$(CONFIG_PCI_XGENE) += pci-xgene.o
 obj-$(CONFIG_PCI_LAYERSCAPE) += pci-layerscape.o
+obj-$(CONFIG_PCIE_IPROC) += pcie-iproc.o
diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
new file mode 100644
index 0000000..bd9f01c
--- /dev/null
+++ b/drivers/pci/host/pcie-iproc.c
@@ -0,0 +1,896 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/msi.h>
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/mbus.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/of_address.h>
+#include <linux/of_pci.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+
+/* max number of MSI event queues */
+#define MAX_MSI_EQ 6
+#define MAX_IRQS MAX_MSI_EQ
+
+#define MDIO_TIMEOUT_USEC 100
+
+#define OPCODE_WRITE 1
+#define OPCODE_READ  2
+
+#define MII_TA_VAL 2
+#define MII_MDCDIV 62
+
+#define MII_MGMT_CTRL_OFFSET         0x000
+#define MII_MGMT_CTRL_MDCDIV_SHIFT   0
+#define MII_MGMT_CTRL_PRE_SHIFT      7
+#define MII_MGMT_CTRL_BUSY_SHIFT     8
+#define MII_MGMT_CTRL_EXT_SHIFT      9
+#define MII_MGMT_CTRL_BTP_SHIFT      10
+
+#define MII_MGMT_CMD_DATA_OFFSET     0x004
+#define MII_MGMT_CMD_DATA_SHIFT      0
+#define MII_MGMT_CMD_TA_SHIFT        16
+#define MII_MGMT_CMD_RA_SHIFT        18
+#define MII_MGMT_CMD_PA_SHIFT        23
+#define MII_MGMT_CMD_OP_SHIFT        28
+#define MII_MGMT_CMD_SB_SHIFT        30
+#define MII_MGMT_CMD_DATA_MASK       0xFFFF
+
+#define CLK_CONTROL_OFFSET           0x000
+#define EP_PERST_SOURCE_SELECT_SHIFT 2
+#define EP_PERST_SOURCE_SELECT       (1 << EP_PERST_SOURCE_SELECT_SHIFT)
+#define EP_MODE_SURVIVE_PERST_SHIFT  1
+#define EP_MODE_SURVIVE_PERST        (1 << EP_MODE_SURVIVE_PERST_SHIFT)
+#define RC_PCIE_RST_OUTPUT_SHIFT     0
+#define RC_PCIE_RST_OUTPUT           (1 << RC_PCIE_RST_OUTPUT_SHIFT)
+
+#define CFG_IND_ADDR_OFFSET          0x120
+#define CFG_IND_ADDR_MASK            0x00001FFC
+
+#define CFG_IND_DATA_OFFSET          0x124
+
+#define CFG_ADDR_OFFSET              0x1F8
+#define CFG_ADDR_BUS_NUM_SHIFT       20
+#define CFG_ADDR_BUS_NUM_MASK        0x0FF00000
+#define CFG_ADDR_DEV_NUM_SHIFT       15
+#define CFG_ADDR_DEV_NUM_MASK        0x000F8000
+#define CFG_ADDR_FUNC_NUM_SHIFT      12
+#define CFG_ADDR_FUNC_NUM_MASK       0x00007000
+#define CFG_ADDR_REG_NUM_SHIFT       2
+#define CFG_ADDR_REG_NUM_MASK        0x00000FFC
+#define CFG_ADDR_CFG_TYPE_SHIFT      0
+#define CFG_ADDR_CFG_TYPE_MASK       0x00000003
+
+#define CFG_DATA_OFFSET              0x1FC
+
+#define SYS_EQ_PAGE_OFFSET           0x200
+#define SYS_MSI_PAGE_OFFSET          0x204
+
+#define SYS_MSI_INTS_EN_OFFSET       0x208
+
+#define SYS_MSI_CTRL_0_OFFSET        0x210
+#define SYS_MSI_INTR_EN_SHIFT        11
+#define SYS_MSI_INTR_EN              (1 << SYS_MSI_INTR_EN_SHIFT)
+#define SYS_MSI_INT_N_EVENT_SHIFT    1
+#define SYS_MSI_INT_N_EVENT          (1 << SYS_MSI_INT_N_EVENT_SHIFT)
+#define SYS_MSI_EQ_EN_SHIFT          0
+#define SYS_MSI_EQ_EN                (1 << SYS_MSI_EQ_EN_SHIFT)
+
+#define SYS_EQ_HEAD_0_OFFSET         0x250
+#define SYS_EQ_TAIL_0_OFFSET         0x254
+#define SYS_EQ_TAIL_0_MASK           0x3F
+
+#define SYS_RC_INTX_EN               0x330
+#define SYS_RC_INTX_MASK             0xF
+
+#define SYS_RC_INTX_CSR              0x334
+#define SYS_RC_INTX_MASK             0xF
+
+#define OARR_0_OFFSET                0xD20
+#define OAAR_0_ADDR_MASK             0xF0000000
+#define OAAR_0_VALID_SHIFT           0
+#define OAAR_0_VALID                 (1 << OAAR_0_VALID_SHIFT)
+#define OAAR_0_UPPER_OFFSET          0xD24
+#define OAAR_0_UPPER_ADDR_MASK       0x0000000F
+
+#define PCIE_SYS_RC_INTX_EN_OFFSET   0x330
+
+#define OMAP_0_LOWER_OFFSET          0xD40
+#define OMAP_0_LOWER_ADDR_MASK       0xF0000000
+#define OMAP_0_UPPER_OFFSET          0x0D44
+
+#define PCIE_LINK_STATUS_OFFSET      0xF0C
+#define PCIE_PHYLINKUP_SHITF         3
+#define PCIE_PHYLINKUP               (1 << PCIE_PHYLINKUP_SHITF)
+
+#define STRAP_STATUS_OFFSET          0xF10
+#define STRAP_1LANE_SHIFT            2
+#define STRAP_1LANE                  (1 << STRAP_1LANE_SHIFT)
+#define STRAP_IF_ENABLE_SHIFT        1
+#define STRAP_IF_ENABLE              (1 << STRAP_IF_ENABLE_SHIFT)
+#define STRAP_RC_MODE_SHIFT          0
+#define STRAP_RC_MODE                (1 << STRAP_RC_MODE_SHIFT)
+
+struct iproc_pcie;
+
+/**
+ * iProc MSI
+ * @pcie: pointer to the iProc PCIe data structure
+ * @irq_in_use: bitmap of MSI IRQs that are in use
+ * @domain: MSI IRQ domain
+ * @chip: MSI controller
+ * @eq_page: memory page to store the iProc MSI event queue
+ * @msi_page: memory page for MSI posted writes
+ */
+struct iproc_msi {
+	struct iproc_pcie *pcie;
+	DECLARE_BITMAP(irq_in_use, MAX_IRQS);
+	struct irq_domain *domain;
+	struct msi_controller chip;
+	unsigned long eq_page;
+	unsigned long msi_page;
+};
+
+/**
+ * iProc PCIe
+ * @dev: pointer to the device
+ * @mii: MII/MDIO management I/O register base
+ * @reg: PCIe I/O register base
+ * @io: PCIe I/O resource
+ * @mem: PCIe memory resource
+ * @busn: PCIe bus resource
+ * @phy_addr: MIDO PHY address
+ * @irqs: Array that stores IRQs
+ * @msi: MSI related info
+ */
+struct iproc_pcie {
+	struct device *dev;
+
+	void __iomem *mii;
+	void __iomem *reg;
+
+	struct resource io;
+	struct resource mem;
+	struct resource busn;
+
+	u32 phy_addr;
+	int irqs[MAX_IRQS];
+
+	struct iproc_msi msi;
+};
+
+static inline int mdio_wait_idle(struct iproc_pcie *pcie)
+{
+	int timeout = MDIO_TIMEOUT_USEC;
+
+	while (readl(pcie->mii + MII_MGMT_CTRL_OFFSET) &
+			(1 << MII_MGMT_CTRL_BUSY_SHIFT)) {
+		udelay(1);
+		if (timeout-- <= 0)
+			return -EBUSY;
+	}
+	return 0;
+}
+
+static void mdio_init(struct iproc_pcie *pcie)
+{
+	u32 val;
+
+	val = MII_MDCDIV << MII_MGMT_CTRL_MDCDIV_SHIFT;
+	val |= (1 << MII_MGMT_CTRL_PRE_SHIFT);
+	writel(val, pcie->mii + MII_MGMT_CTRL_OFFSET);
+
+	WARN_ON(mdio_wait_idle(pcie));
+}
+
+static u16 mdio_read(struct iproc_pcie *pcie, unsigned int phy_addr,
+		unsigned int reg_addr)
+{
+	u32 val;
+
+	WARN_ON(mdio_wait_idle(pcie));
+
+	val = (MII_TA_VAL << MII_MGMT_CMD_TA_SHIFT);
+	val |= (reg_addr << MII_MGMT_CMD_RA_SHIFT);
+	val |= (phy_addr << MII_MGMT_CMD_PA_SHIFT);
+	val |= (OPCODE_READ << MII_MGMT_CMD_OP_SHIFT);
+	val |= (1 << MII_MGMT_CMD_SB_SHIFT);
+	writel(val, pcie->mii + MII_MGMT_CMD_DATA_OFFSET);
+
+	WARN_ON(mdio_wait_idle(pcie));
+
+	val = readl(pcie->mii + MII_MGMT_CMD_DATA_OFFSET) &
+		MII_MGMT_CMD_DATA_MASK;
+
+	return (u16)val;
+}
+
+static void mdio_write(struct iproc_pcie *pcie, unsigned int phy_addr,
+		unsigned int reg_addr, u16 wr_data)
+{
+	u32 val;
+
+	WARN_ON(mdio_wait_idle(pcie));
+
+	val = (MII_TA_VAL << MII_MGMT_CMD_TA_SHIFT);
+	val |= (reg_addr << MII_MGMT_CMD_RA_SHIFT);
+	val |= (phy_addr << MII_MGMT_CMD_PA_SHIFT);
+	val |= (OPCODE_WRITE << MII_MGMT_CMD_OP_SHIFT);
+	val |= (1 << MII_MGMT_CMD_SB_SHIFT);
+	val |= ((u32)wr_data & MII_MGMT_CMD_DATA_MASK);
+	writel(val, pcie->mii + MII_MGMT_CMD_DATA_OFFSET);
+
+	WARN_ON(mdio_wait_idle(pcie));
+}
+
+#define PCIE_PHY_BLK_ADDR_OFFSET 0x1F
+#define PCIE_PHY_BLK_ADDR_MASK   0xFFF0
+#define PCIE_PHY_REG_ADDR_MASK   0xF
+static u16 iproc_pcie_phy_reg_read(struct iproc_pcie *pcie,
+		unsigned int phy_addr, unsigned int reg_addr)
+{
+	u16 val;
+
+	mdio_write(pcie, phy_addr, PCIE_PHY_BLK_ADDR_OFFSET,
+			reg_addr & PCIE_PHY_BLK_ADDR_MASK);
+	val = mdio_read(pcie, phy_addr, reg_addr & PCIE_PHY_REG_ADDR_MASK);
+
+	dev_dbg(pcie->dev, "phy rd: phy: 0x%0x reg: 0x%4x data: 0x%4x\n",
+			phy_addr, reg_addr, val);
+
+	return val;
+}
+
+static void iproc_pcie_phy_reg_write(struct iproc_pcie *pcie,
+		unsigned int phy_addr, unsigned int reg_addr, u16 val)
+{
+	mdio_write(pcie, phy_addr, PCIE_PHY_BLK_ADDR_OFFSET,
+			reg_addr & PCIE_PHY_BLK_ADDR_MASK);
+	mdio_write(pcie, phy_addr, reg_addr & PCIE_PHY_REG_ADDR_MASK, val);
+
+	dev_dbg(pcie->dev, "phy wr: phy: 0x%0x reg: 0x%4x data: 0x%4x\n",
+			phy_addr, reg_addr, val);
+}
+
+static inline struct iproc_pcie *sys_to_pcie(struct pci_sys_data *sys)
+{
+	return sys->private_data;
+}
+
+static void iproc_pcie_reset(struct iproc_pcie *pcie)
+{
+	u32 val;
+
+	/* send a downstream reset */
+	val = EP_MODE_SURVIVE_PERST | RC_PCIE_RST_OUTPUT;
+	writel(val, pcie->reg + CLK_CONTROL_OFFSET);
+	udelay(250);
+	val &= ~EP_MODE_SURVIVE_PERST;
+	writel(val, pcie->reg + CLK_CONTROL_OFFSET);
+	mdelay(250);
+}
+
+#define INVALID_ACCESS_OFFSET 0xFFFFFFFF
+static u32 iproc_pcie_conf_access(struct iproc_pcie *pcie, struct pci_bus *bus,
+		unsigned int devfn, int where)
+{
+	int busno = bus->number;
+	int slot = PCI_SLOT(devfn);
+	int fn = PCI_FUNC(devfn);
+	u32 val;
+
+	/* root complex access */
+	if (busno == 0) {
+		if (slot)
+			return INVALID_ACCESS_OFFSET;
+		writel(where & CFG_IND_ADDR_MASK,
+				pcie->reg + CFG_IND_ADDR_OFFSET);
+		return CFG_IND_DATA_OFFSET;
+	}
+
+	if (fn > 1)
+		return INVALID_ACCESS_OFFSET;
+
+	/* access of EP device */
+	val = (bus->number << CFG_ADDR_BUS_NUM_SHIFT) |
+		(PCI_SLOT(devfn) << CFG_ADDR_DEV_NUM_SHIFT) |
+		(PCI_FUNC(devfn) << CFG_ADDR_FUNC_NUM_SHIFT) |
+		(where & CFG_ADDR_REG_NUM_MASK) |
+		(1 & CFG_ADDR_CFG_TYPE_MASK);
+	writel(val, pcie->reg + CFG_ADDR_OFFSET);
+
+	return CFG_DATA_OFFSET;
+}
+
+#define INVALID_CFG_RD 0xFFFFFFFF
+static int iproc_pci_read_conf(struct pci_bus *bus, unsigned int devfn,
+		int where, int size, u32 *val)
+{
+	u32 offset;
+	struct iproc_pcie *pcie = sys_to_pcie(bus->sysdata);
+
+	*val = INVALID_CFG_RD;
+
+	if (size != 1 && size != 2 && size != 4)
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+	else if ((size == 2) && (where & 1))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+	else if ((size == 4) && (where & 3))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	offset = iproc_pcie_conf_access(pcie, bus, devfn, where);
+	if (offset == INVALID_ACCESS_OFFSET)
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	*val = readl(pcie->reg + offset);
+
+	switch (size) {
+	case 4:
+		/* return raw data */
+		break;
+	case 2:
+		*val = (*val >> (8 * (where & 3))) & 0xFFFF;
+		break;
+	case 1:
+		*val = (*val >> (8 * (where & 3))) & 0xFF;
+		break;
+	default:
+		BUG_ON(1);
+	}
+
+	dev_dbg(pcie->dev, "conf rd: busn=%d devfn=%d where=%d size=%d val=0x%08x\n",
+			bus->number, devfn, where, size, *val);
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int iproc_pci_write_conf(struct pci_bus *bus, unsigned int devfn,
+		int where, int size, u32 val)
+{
+	int shift;
+	u32 offset, data;
+	struct iproc_pcie *pcie = sys_to_pcie(bus->sysdata);
+
+	if (size != 1 && size != 2 && size != 4)
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+	else if ((size == 2) && (where & 1))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+	else if ((size == 4) && (where & 3))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	offset = iproc_pcie_conf_access(pcie, bus, devfn, where);
+	if (offset == INVALID_ACCESS_OFFSET)
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	data = readl(pcie->reg + offset);
+
+	switch (size) {
+	case 4:
+		data = val;
+		break;
+	case 2:
+		shift = 8 * (where & 2);
+		data &= ~(0xFFFF << shift);
+		data |= ((val & 0xFFFF) << shift);
+		break;
+	case 1:
+		shift = 8 * (where & 3);
+		data &= ~(0xFF << shift);
+		data |= ((val & 0xFF) << shift);
+		break;
+	default:
+		BUG_ON(1);
+	}
+
+	writel(data, pcie->reg + offset);
+
+	dev_dbg(pcie->dev,
+		"config wr: busn=%d devfn=%d where=%d size=%d data=0x%08x\n",
+		bus->number, devfn, where, size, data);
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static struct pci_ops iproc_pcie_ops = {
+	.read = iproc_pci_read_conf,
+	.write = iproc_pci_write_conf,
+};
+
+static int iproc_pcie_check_link(struct iproc_pcie *pcie)
+{
+	int ret;
+	u8 nlw;
+	u16 pos, tmp16;
+	u32 val;
+	struct pci_sys_data sys;
+	struct pci_bus bus;
+
+	val = readl(pcie->reg + PCIE_LINK_STATUS_OFFSET);
+	dev_dbg(pcie->dev, "link status: 0x%08x\n", val);
+
+	val = readl(pcie->reg + STRAP_STATUS_OFFSET);
+	dev_dbg(pcie->dev, "strap status: 0x%08x\n", val);
+
+	memset(&sys, 0, sizeof(sys));
+	memset(&bus, 0, sizeof(bus));
+
+	bus.number = 0;
+	bus.ops = &iproc_pcie_ops;
+	bus.sysdata = &sys;
+	sys.private_data = pcie;
+
+	ret = iproc_pci_read_conf(&bus, 0, PCI_HEADER_TYPE, 1, &val);
+	if (ret != PCIBIOS_SUCCESSFUL || val != PCI_HEADER_TYPE_BRIDGE) {
+		dev_err(pcie->dev, "in EP mode, val=0x08%x\n", val);
+		return -EFAULT;
+	}
+
+	/*
+	 * Under RC mode, write to function specific register 0x43c, to change
+	 * the CLASS code in configuration space
+	 *
+	 * After this modification, the CLASS code in configuration space would
+	 * be read as PCI_CLASS_BRIDGE_PCI(0x0604)
+	 */
+#define PCI_BRIDGE_CTRL_REG_OFFSET 0x43C
+#define PCI_CLASS_BRIDGE_PCI_MASK  0xFF0000FF
+	pci_bus_read_config_dword(&bus, 0, PCI_BRIDGE_CTRL_REG_OFFSET, &val);
+	val = (val & PCI_CLASS_BRIDGE_PCI_MASK) | (PCI_CLASS_BRIDGE_PCI << 8);
+	pci_bus_write_config_dword(&bus, 0, PCI_BRIDGE_CTRL_REG_OFFSET, val);
+
+	/* check link status to see if link is active */
+	pos = pci_bus_find_capability(&bus, 0, PCI_CAP_ID_EXP);
+	pci_bus_read_config_word(&bus, 0, pos + PCI_EXP_LNKSTA, &tmp16);
+	tmp16 &= PCI_EXP_LNKSTA_DLLLA;
+	nlw = (tmp16 & PCI_EXP_LNKSTA_NLW) >> PCI_EXP_LNKSTA_NLW_SHIFT;
+
+	if (nlw == 0) {
+		/* try GEN 1 link speed */
+#define PCI_LINK_STATUS_CTRL_2_OFFSET 0xDC
+#define PCI_TARGET_LINK_SPEED_MASK    0xF
+#define PCI_TARGET_LINK_SPEED_GEN2    0x2
+#define PCI_TARGET_LINK_SPEED_GEN1    0x1
+		pci_bus_read_config_dword(&bus, 0,
+				PCI_LINK_STATUS_CTRL_2_OFFSET, &val);
+		if ((val & PCI_TARGET_LINK_SPEED_MASK) ==
+				PCI_TARGET_LINK_SPEED_GEN2) {
+			val &= ~PCI_TARGET_LINK_SPEED_MASK;
+			val |= PCI_TARGET_LINK_SPEED_GEN1;
+			pci_bus_write_config_dword(&bus, 0,
+					PCI_LINK_STATUS_CTRL_2_OFFSET, val);
+			pci_bus_read_config_dword(&bus, 0,
+					PCI_LINK_STATUS_CTRL_2_OFFSET, &val);
+			mdelay(100);
+
+			pos = pci_bus_find_capability(&bus, 0, PCI_CAP_ID_EXP);
+			pci_bus_read_config_word(&bus, 0, pos + PCI_EXP_LNKSTA,
+					&tmp16);
+			nlw = (tmp16 & PCI_EXP_LNKSTA_NLW) >>
+				PCI_EXP_LNKSTA_NLW_SHIFT;
+		}
+	}
+
+	dev_info(pcie->dev, "link: %s\n", nlw ? "UP" : "DOWN");
+
+	return nlw ? 0 : -ENODEV;
+}
+
+static int iproc_pcie_setup(int nr, struct pci_sys_data *sys)
+{
+	struct iproc_pcie *pcie = sys_to_pcie(sys);
+
+	pci_add_resource(&sys->resources, &pcie->io);
+	pci_add_resource(&sys->resources, &pcie->mem);
+	pci_add_resource(&sys->resources, &pcie->busn);
+
+	return 1;
+}
+
+static struct pci_bus *iproc_pcie_scan_bus(int nr, struct pci_sys_data *sys)
+{
+	struct iproc_pcie *pcie = sys->private_data;
+	struct pci_bus *bus;
+
+	bus = pci_create_root_bus(pcie->dev, sys->busnr, &iproc_pcie_ops, sys,
+			&sys->resources);
+	if (!bus)
+		return NULL;
+
+	if (IS_ENABLED(CONFIG_PCI_MSI))
+		bus->msi = &pcie->msi.chip;
+
+	pci_scan_child_bus(bus);
+
+	return bus;
+}
+
+static int iproc_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+{
+	struct iproc_pcie *pcie = sys_to_pcie(dev->sysdata);
+
+	/* need to use the 5th IRQ for INTx */
+	return pcie->irqs[4];
+}
+
+static struct hw_pci hw;
+
+static void iproc_pcie_enable(struct iproc_pcie *pcie)
+{
+	hw.nr_controllers = 1;
+	hw.private_data = (void **)&pcie;
+	hw.setup = iproc_pcie_setup;
+	hw.scan = iproc_pcie_scan_bus;
+	hw.map_irq = iproc_pcie_map_irq;
+	hw.ops = &iproc_pcie_ops;
+
+	/* enable root complex INTX */
+	writel(SYS_RC_INTX_MASK, pcie->reg + SYS_RC_INTX_EN);
+
+	pci_common_init_dev(pcie->dev, &hw);
+#ifdef CONFIG_PCI_DOMAINS
+	hw.domain++;
+#endif
+}
+
+#define PCIE_PHY_REG_ADDR 0x2103
+#define PCIE_PHY_DATA     0x2B1C
+static void iproc_pcie_mii_phy_init(struct iproc_pcie *pcie, u32 phy_addr)
+{
+	unsigned int reg_addr;
+	u16 val;
+
+	mdio_init(pcie);
+
+	reg_addr = PCIE_PHY_REG_ADDR;
+	val = PCIE_PHY_DATA;
+	iproc_pcie_phy_reg_write(pcie, phy_addr, reg_addr, val);
+	val = iproc_pcie_phy_reg_read(pcie, phy_addr, reg_addr);
+	dev_info(pcie->dev, "phy: 0x%x reg: 0x%4x val: 0x%4x\n", phy_addr,
+			reg_addr, val);
+}
+
+static inline struct iproc_msi *to_iproc_msi(struct msi_controller *chip)
+{
+	return container_of(chip, struct iproc_msi, chip);
+}
+
+static int iproc_msi_irq_assign(struct iproc_msi *chip)
+{
+	int msi;
+
+	msi = find_first_zero_bit(chip->irq_in_use, MAX_IRQS);
+	if (msi < MAX_IRQS)
+		set_bit(msi, chip->irq_in_use);
+	else
+		msi = -ENOSPC;
+
+	return msi;
+}
+
+static void iproc_msi_irq_free(struct iproc_msi *chip, unsigned long irq)
+{
+	clear_bit(irq, chip->irq_in_use);
+}
+
+static int iproc_msi_setup_irq(struct msi_controller *chip,
+		struct pci_dev *pdev, struct msi_desc *desc)
+{
+	struct iproc_msi *msi = to_iproc_msi(chip);
+	struct iproc_pcie *pcie = msi->pcie;
+	struct msi_msg msg;
+	unsigned int irq;
+	int hwirq;
+
+	hwirq = iproc_msi_irq_assign(msi);
+	if (hwirq < 0)
+		return hwirq;
+
+	irq = irq_create_mapping(msi->domain, hwirq);
+	if (!irq) {
+		iproc_msi_irq_free(msi, hwirq);
+		return -EINVAL;
+	}
+
+	dev_dbg(pcie->dev, "mapped irq:%d\n", irq);
+
+	irq_set_msi_desc(irq, desc);
+
+	msg.address_lo = virt_to_phys((void *)msi->msi_page) | (hwirq * 4);
+	msg.address_hi = 0x0;
+	msg.data = hwirq;
+
+	write_msi_msg(irq, &msg);
+
+	return 0;
+}
+
+static void iproc_msi_teardown_irq(struct msi_controller *chip,
+		unsigned int irq)
+{
+	struct iproc_msi *msi = to_iproc_msi(chip);
+	struct irq_data *data = irq_get_irq_data(irq);
+
+	iproc_msi_irq_free(msi, data->hwirq);
+}
+
+static struct irq_chip iproc_msi_irq_chip = {
+	.name = "iProc PCIe MSI",
+	.irq_enable = unmask_msi_irq,
+	.irq_disable = mask_msi_irq,
+	.irq_mask = mask_msi_irq,
+	.irq_unmask = unmask_msi_irq,
+};
+
+static int iproc_msi_map(struct irq_domain *domain, unsigned int irq,
+			irq_hw_number_t hwirq)
+{
+	irq_set_chip_and_handler(irq, &iproc_msi_irq_chip, handle_simple_irq);
+	irq_set_chip_data(irq, domain->host_data);
+	set_irq_flags(irq, IRQF_VALID);
+
+	return 0;
+}
+
+static const struct irq_domain_ops iproc_msi_domain_ops = {
+	.map = iproc_msi_map,
+};
+
+static irqreturn_t iproc_msi_irq(int irq, void *data)
+{
+	struct iproc_pcie *pcie = data;
+	unsigned int eq, head, tail, num_events;
+
+	/* Do not handle INTx interrupt */
+	if ((readl(pcie->reg + SYS_RC_INTX_CSR) & SYS_RC_INTX_MASK) != 0)
+		return IRQ_NONE;
+
+	eq = irq - pcie->irqs[0];
+	BUG_ON(eq >= MAX_MSI_EQ);
+
+	irq = irq_find_mapping(pcie->msi.domain, eq);
+	head = readl(pcie->reg + SYS_EQ_HEAD_0_OFFSET + (eq * 8));
+	do {
+		tail = readl(pcie->reg + SYS_EQ_TAIL_0_OFFSET + (eq * 8));
+		tail &= SYS_EQ_TAIL_0_MASK;
+
+		num_events = (tail < head) ?
+			(64 + (tail - head)) : (tail - head);
+		if (!num_events)
+			break;
+
+		generic_handle_irq(irq);
+
+		head++;
+		head %= 64;
+		writel(head, pcie->reg + SYS_EQ_HEAD_0_OFFSET + (eq * 8));
+	} while (true);
+
+	return IRQ_HANDLED;
+}
+
+static int iproc_pcie_enable_msi(struct iproc_pcie *pcie)
+{
+	struct iproc_msi *msi = &pcie->msi;
+	struct device_node *np = pcie->dev->of_node;
+	int i, ret;
+	u32 val;
+
+	msi->pcie = pcie;
+	msi->chip.dev = pcie->dev;
+	msi->chip.setup_irq = iproc_msi_setup_irq;
+	msi->chip.teardown_irq = iproc_msi_teardown_irq;
+
+	msi->domain = irq_domain_add_linear(pcie->dev->of_node, MAX_IRQS,
+			&iproc_msi_domain_ops, &msi->chip);
+	if (!msi->domain) {
+		dev_err(pcie->dev, "failed to create IRQ domain\n");
+		return -ENOMEM;
+	}
+
+	for (i = 0; i < MAX_IRQS; i++) {
+		ret = devm_request_irq(pcie->dev, pcie->irqs[i],
+			iproc_msi_irq, IRQF_SHARED, "iproc-pcie", pcie);
+		if (ret < 0) {
+			dev_err(pcie->dev, "failed to request IRQ: %d\n",
+					pcie->irqs[i]);
+			goto err_rm_irq_domain;
+		}
+	}
+
+	msi->eq_page = __get_free_pages(GFP_KERNEL, 0);
+	if (!msi->eq_page) {
+		dev_err(pcie->dev,
+			"failed to allocate memory for MSI event queue\n");
+		ret = -ENOMEM;
+		goto err_rm_irq_domain;
+	}
+
+	msi->msi_page = __get_free_pages(GFP_KERNEL, 0);
+	if (!msi->msi_page) {
+		dev_err(pcie->dev,
+			"failed to allocate memory for MSI\n");
+		ret = -ENOMEM;
+		goto err_free_msi_eq_page;
+	}
+
+	writel(virt_to_phys((void *)msi->eq_page),
+			pcie->reg + SYS_EQ_PAGE_OFFSET);
+	writel(virt_to_phys((void *)msi->msi_page),
+			pcie->reg + SYS_MSI_PAGE_OFFSET);
+
+	for (i = 0; i < MAX_MSI_EQ; i++) {
+		/* enable MSI event queue and interrupt */
+		val = SYS_MSI_INTR_EN | SYS_MSI_INT_N_EVENT | SYS_MSI_EQ_EN;
+		writel(val, pcie->reg + SYS_MSI_CTRL_0_OFFSET + (i * 4));
+		/*
+		 * To support legacy platforms that require the MSI interrupt
+		 * enable register to be set explicitly
+		 */
+		if (of_find_property(np, "have-msi-inten-reg", NULL)) {
+			val = readl(pcie->reg + SYS_MSI_INTS_EN_OFFSET);
+			val |= (1 << i);
+			writel(val, pcie->reg + SYS_MSI_INTS_EN_OFFSET);
+		}
+	}
+
+	dev_info(pcie->dev, "MSI enabled\n");
+	return 0;
+
+err_free_msi_eq_page:
+	free_pages(msi->eq_page, 0);
+
+err_rm_irq_domain:
+	irq_domain_remove(msi->domain);
+	return ret;
+}
+
+static int __init iproc_pcie_probe(struct platform_device *pdev)
+{
+	struct iproc_pcie *pcie;
+	struct device_node *np = pdev->dev.of_node;
+	struct of_pci_range range;
+	struct of_pci_range_parser parser;
+	struct resource res, regs;
+	int i, ret;
+
+	pcie = devm_kzalloc(&pdev->dev, sizeof(struct iproc_pcie),
+			    GFP_KERNEL);
+	if (!pcie)
+		return -ENOMEM;
+
+	pcie->dev = &pdev->dev;
+	platform_set_drvdata(pdev, pcie);
+
+	if (of_pci_parse_bus_range(pdev->dev.of_node, &pcie->busn)) {
+		dev_err(&pdev->dev, "failed to parse bus-range property\n");
+		return -EINVAL;
+	}
+
+	/* PCIE controller registers */
+	ret = of_address_to_resource(np, 0, &regs);
+	if (ret) {
+		dev_err(pcie->dev, "unable to obtain device resources\n");
+		return -ENODEV;
+	}
+
+	pcie->reg = devm_ioremap(pcie->dev, regs.start, resource_size(&regs));
+	if (!pcie->reg) {
+		dev_err(pcie->dev, "unable to map device reg resources\n");
+		return -ENOMEM;
+	}
+
+	/* MDIO registers */
+	ret = of_address_to_resource(np, 1, &regs);
+	if (ret) {
+		dev_err(pcie->dev, "unable to obtain device resources\n");
+		return -ENODEV;
+	}
+
+	pcie->mii = devm_ioremap(pcie->dev, regs.start, resource_size(&regs));
+	if (!pcie->mii) {
+		dev_err(pcie->dev, "unable to map device mii resources\n");
+		return -ENOMEM;
+	}
+
+	for (i = 0; i < MAX_IRQS; i++) {
+		pcie->irqs[i] = irq_of_parse_and_map(np, i);
+		if (!pcie->irqs[i]) {
+			dev_err(pcie->dev, "unable to parse irq index:%d\n", i);
+			return -ENODEV;
+		}
+	}
+
+	if (of_property_read_u32(np, "phy-addr", &pcie->phy_addr)) {
+		dev_err(pcie->dev, "missing \"phy-addr\" property in DT\n");
+		return -EINVAL;
+	}
+
+	if (of_pci_range_parser_init(&parser, np)) {
+		dev_err(pcie->dev, "missing \"ranges\" property in DT\n");
+		return -EINVAL;
+	}
+
+	/* Get the PCI memory ranges from DT */
+	for_each_of_pci_range(&parser, &range) {
+		of_pci_range_to_resource(&range, np, &res);
+
+		switch (res.flags & IORESOURCE_TYPE_BITS) {
+		case IORESOURCE_IO:
+			memcpy(&pcie->io, &res, sizeof(res));
+			pcie->io.name = "I/O";
+			break;
+
+		case IORESOURCE_MEM:
+			memcpy(&pcie->mem, &res, sizeof(res));
+			pcie->mem.name = "MEM";
+			break;
+		}
+	}
+
+	if (IS_ENABLED(CONFIG_PCI_MSI)) {
+		ret = iproc_pcie_enable_msi(pcie);
+		if (ret < 0) {
+			dev_err(pcie->dev, "failed to enable MSI support\n");
+			return ret;
+		}
+	}
+
+	iproc_pcie_mii_phy_init(pcie, pcie->phy_addr);
+
+	iproc_pcie_reset(pcie);
+
+	ret = iproc_pcie_check_link(pcie);
+	if (ret) {
+		dev_err(pcie->dev, "no PCIe EP device detected\n");
+		return ret;
+	}
+
+	iproc_pcie_enable(pcie);
+	pci_assign_unassigned_resources();
+
+	return 0;
+}
+
+static const struct of_device_id iproc_pcie_of_match_table[] = {
+	{ .compatible = "brcm,iproc-pcie", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, iproc_pcie_of_match_table);
+
+static struct platform_driver iproc_pcie_driver = {
+	.driver = {
+		.owner = THIS_MODULE,
+		.name = "iproc-pcie",
+		.of_match_table =
+		   of_match_ptr(iproc_pcie_of_match_table),
+	},
+};
+
+static int __init iproc_pcie_init(void)
+{
+	return platform_driver_probe(&iproc_pcie_driver,
+			iproc_pcie_probe);
+}
+subsys_initcall(iproc_pcie_init);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom iPROC PCIe driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH 3/4] ARM: mach-bcm: Enable PCIe support for iProc

[Ray Jui]

Enable PCIe driver support for Broadcom iProc family of SoCs by
selecting PCIE_IPROC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/mach-bcm/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index aaeec78..a13a0b2 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -19,6 +19,7 @@ config ARCH_BCM_IPROC
 	select ARCH_REQUIRE_GPIOLIB
 	select ARM_AMBA
 	select PINCTRL
+	select PCIE_IPROC
 	help
 	  This enables support for systems based on Broadcom IPROC architected SoCs.
 	  The IPROC complex contains one or more ARM CPUs along with common
-- 
1.7.9.5

[PATCH 3/4] ARM: mach-bcm: Enable PCIe support for iProc

[Ray Jui]

Enable PCIe driver support for Broadcom iProc family of SoCs by
selecting PCIE_IPROC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/mach-bcm/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index aaeec78..a13a0b2 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -19,6 +19,7 @@ config ARCH_BCM_IPROC
 	select ARCH_REQUIRE_GPIOLIB
 	select ARM_AMBA
 	select PINCTRL
+	select PCIE_IPROC
 	help
 	  This enables support for systems based on Broadcom IPROC architected SoCs.
 	  The IPROC complex contains one or more ARM CPUs along with common
-- 
1.7.9.5

[PATCH 3/4] ARM: mach-bcm: Enable PCIe support for iProc

[Ray Jui]

Enable PCIe driver support for Broadcom iProc family of SoCs by
selecting PCIE_IPROC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/mach-bcm/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index aaeec78..a13a0b2 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -19,6 +19,7 @@ config ARCH_BCM_IPROC
 	select ARCH_REQUIRE_GPIOLIB
 	select ARM_AMBA
 	select PINCTRL
+	select PCIE_IPROC
 	help
 	  This enables support for systems based on Broadcom IPROC architected SoCs.
 	  The IPROC complex contains one or more ARM CPUs along with common
-- 
1.7.9.5

[PATCH 4/4] ARM: dts: enable PCIe for Broadcom Cygnus

[Ray Jui]

Add PCIe device nodes and its properties in bcm-cygnus.dtsi but keep it
disabled there. Only enable it in bcm958300k.dts because PCIe interfaces
are only populated on that board

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   43 +++++++++++++++++++++++++++++++++++++
 arch/arm/boot/dts/bcm958300k.dts  |    8 +++++++
 2 files changed, 51 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..669bb3b 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -70,6 +70,49 @@
 		};
 	};
 
+	pcie0: pcie@18012000 {
+		compatible = "brcm,iproc-pcie";
+		reg = <0x18012000 0x1000>,
+			<0x18002000 0x1000>;
+		interrupts = <GIC_SPI 96 IRQ_TYPE_NONE>,
+			     <GIC_SPI 97 IRQ_TYPE_NONE>,
+			     <GIC_SPI 98 IRQ_TYPE_NONE>,
+			     <GIC_SPI 99 IRQ_TYPE_NONE>,
+			     <GIC_SPI 100 IRQ_TYPE_NONE>,
+			     <GIC_SPI 101 IRQ_TYPE_NONE>;
+		bus-range = <0x00 0xFF>;
+
+		#address-cells = <3>;
+		#size-cells = <2>;
+		device_type = "pci";
+		ranges = <0x81000000 0 0	  0x28000000 0 0x00010000
+			  0x82000000 0 0x20000000 0x20000000 0 0x04000000>;
+		phy-addr = <5>;
+		status = "disabled";
+	};
+
+	pcie1: pcie@18013000 {
+		compatible = "brcm,iproc-pcie";
+		reg = <0x18013000 0x1000>,
+			<0x18002000 0x1000>;
+
+		interrupts = <GIC_SPI 102 IRQ_TYPE_NONE>,
+			     <GIC_SPI 103 IRQ_TYPE_NONE>,
+			     <GIC_SPI 104 IRQ_TYPE_NONE>,
+			     <GIC_SPI 105 IRQ_TYPE_NONE>,
+			     <GIC_SPI 106 IRQ_TYPE_NONE>,
+			     <GIC_SPI 107 IRQ_TYPE_NONE>;
+		bus-range = <0x00 0xFF>;
+
+		#address-cells = <3>;
+		#size-cells = <2>;
+		device_type = "pci";
+		ranges = <0x81000000 0 0	  0x48000000 0 0x00010000
+			  0x82000000 0 0x40000000 0x40000000 0 0x04000000>;
+		phy-addr = <6>;
+		status = "disabled";
+	};
+
 	uart0: serial@18020000 {
 		compatible = "snps,dw-apb-uart";
 		reg = <0x18020000 0x100>;
diff --git a/arch/arm/boot/dts/bcm958300k.dts b/arch/arm/boot/dts/bcm958300k.dts
index f1bb36f..c9eb856 100644
--- a/arch/arm/boot/dts/bcm958300k.dts
+++ b/arch/arm/boot/dts/bcm958300k.dts
@@ -47,6 +47,14 @@
 		bootargs = "console=ttyS0,115200";
 	};
 
+	pcie0: pcie@18012000 {
+		status = "okay";
+	};
+
+	pcie1: pcie@18013000 {
+		status = "okay";
+	};
+
 	uart3: serial@18023000 {
 		status = "okay";
 	};
-- 
1.7.9.5

[PATCH 4/4] ARM: dts: enable PCIe for Broadcom Cygnus

[Ray Jui]

Add PCIe device nodes and its properties in bcm-cygnus.dtsi but keep it
disabled there. Only enable it in bcm958300k.dts because PCIe interfaces
are only populated on that board

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   43 +++++++++++++++++++++++++++++++++++++
 arch/arm/boot/dts/bcm958300k.dts  |    8 +++++++
 2 files changed, 51 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..669bb3b 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -70,6 +70,49 @@
 		};
 	};
 
+	pcie0: pcie@18012000 {
+		compatible = "brcm,iproc-pcie";
+		reg = <0x18012000 0x1000>,
+			<0x18002000 0x1000>;
+		interrupts = <GIC_SPI 96 IRQ_TYPE_NONE>,
+			     <GIC_SPI 97 IRQ_TYPE_NONE>,
+			     <GIC_SPI 98 IRQ_TYPE_NONE>,
+			     <GIC_SPI 99 IRQ_TYPE_NONE>,
+			     <GIC_SPI 100 IRQ_TYPE_NONE>,
+			     <GIC_SPI 101 IRQ_TYPE_NONE>;
+		bus-range = <0x00 0xFF>;
+
+		#address-cells = <3>;
+		#size-cells = <2>;
+		device_type = "pci";
+		ranges = <0x81000000 0 0	  0x28000000 0 0x00010000
+			  0x82000000 0 0x20000000 0x20000000 0 0x04000000>;
+		phy-addr = <5>;
+		status = "disabled";
+	};
+
+	pcie1: pcie@18013000 {
+		compatible = "brcm,iproc-pcie";
+		reg = <0x18013000 0x1000>,
+			<0x18002000 0x1000>;
+
+		interrupts = <GIC_SPI 102 IRQ_TYPE_NONE>,
+			     <GIC_SPI 103 IRQ_TYPE_NONE>,
+			     <GIC_SPI 104 IRQ_TYPE_NONE>,
+			     <GIC_SPI 105 IRQ_TYPE_NONE>,
+			     <GIC_SPI 106 IRQ_TYPE_NONE>,
+			     <GIC_SPI 107 IRQ_TYPE_NONE>;
+		bus-range = <0x00 0xFF>;
+
+		#address-cells = <3>;
+		#size-cells = <2>;
+		device_type = "pci";
+		ranges = <0x81000000 0 0	  0x48000000 0 0x00010000
+			  0x82000000 0 0x40000000 0x40000000 0 0x04000000>;
+		phy-addr = <6>;
+		status = "disabled";
+	};
+
 	uart0: serial@18020000 {
 		compatible = "snps,dw-apb-uart";
 		reg = <0x18020000 0x100>;
diff --git a/arch/arm/boot/dts/bcm958300k.dts b/arch/arm/boot/dts/bcm958300k.dts
index f1bb36f..c9eb856 100644
--- a/arch/arm/boot/dts/bcm958300k.dts
+++ b/arch/arm/boot/dts/bcm958300k.dts
@@ -47,6 +47,14 @@
 		bootargs = "console=ttyS0,115200";
 	};
 
+	pcie0: pcie@18012000 {
+		status = "okay";
+	};
+
+	pcie1: pcie@18013000 {
+		status = "okay";
+	};
+
 	uart3: serial@18023000 {
 		status = "okay";
 	};
-- 
1.7.9.5

[PATCH 4/4] ARM: dts: enable PCIe for Broadcom Cygnus

[Ray Jui]

Add PCIe device nodes and its properties in bcm-cygnus.dtsi but keep it
disabled there. Only enable it in bcm958300k.dts because PCIe interfaces
are only populated on that board

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   43 +++++++++++++++++++++++++++++++++++++
 arch/arm/boot/dts/bcm958300k.dts  |    8 +++++++
 2 files changed, 51 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..669bb3b 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -70,6 +70,49 @@
 		};
 	};
 
+	pcie0: pcie at 18012000 {
+		compatible = "brcm,iproc-pcie";
+		reg = <0x18012000 0x1000>,
+			<0x18002000 0x1000>;
+		interrupts = <GIC_SPI 96 IRQ_TYPE_NONE>,
+			     <GIC_SPI 97 IRQ_TYPE_NONE>,
+			     <GIC_SPI 98 IRQ_TYPE_NONE>,
+			     <GIC_SPI 99 IRQ_TYPE_NONE>,
+			     <GIC_SPI 100 IRQ_TYPE_NONE>,
+			     <GIC_SPI 101 IRQ_TYPE_NONE>;
+		bus-range = <0x00 0xFF>;
+
+		#address-cells = <3>;
+		#size-cells = <2>;
+		device_type = "pci";
+		ranges = <0x81000000 0 0	  0x28000000 0 0x00010000
+			  0x82000000 0 0x20000000 0x20000000 0 0x04000000>;
+		phy-addr = <5>;
+		status = "disabled";
+	};
+
+	pcie1: pcie at 18013000 {
+		compatible = "brcm,iproc-pcie";
+		reg = <0x18013000 0x1000>,
+			<0x18002000 0x1000>;
+
+		interrupts = <GIC_SPI 102 IRQ_TYPE_NONE>,
+			     <GIC_SPI 103 IRQ_TYPE_NONE>,
+			     <GIC_SPI 104 IRQ_TYPE_NONE>,
+			     <GIC_SPI 105 IRQ_TYPE_NONE>,
+			     <GIC_SPI 106 IRQ_TYPE_NONE>,
+			     <GIC_SPI 107 IRQ_TYPE_NONE>;
+		bus-range = <0x00 0xFF>;
+
+		#address-cells = <3>;
+		#size-cells = <2>;
+		device_type = "pci";
+		ranges = <0x81000000 0 0	  0x48000000 0 0x00010000
+			  0x82000000 0 0x40000000 0x40000000 0 0x04000000>;
+		phy-addr = <6>;
+		status = "disabled";
+	};
+
 	uart0: serial at 18020000 {
 		compatible = "snps,dw-apb-uart";
 		reg = <0x18020000 0x100>;
diff --git a/arch/arm/boot/dts/bcm958300k.dts b/arch/arm/boot/dts/bcm958300k.dts
index f1bb36f..c9eb856 100644
--- a/arch/arm/boot/dts/bcm958300k.dts
+++ b/arch/arm/boot/dts/bcm958300k.dts
@@ -47,6 +47,14 @@
 		bootargs = "console=ttyS0,115200";
 	};
 
+	pcie0: pcie at 18012000 {
+		status = "okay";
+	};
+
+	pcie1: pcie at 18013000 {
+		status = "okay";
+	};
+
 	uart3: serial at 18023000 {
 		status = "okay";
 	};
-- 
1.7.9.5

[PATCH 0/4] Add I2C support to Broadcom iProc

[Ray Jui]

This patchset contains the initial I2C support for Broadcom iProc family of
SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has a
size of 64 bytes. The iProc I2C controller supports two bus speeds including
standard mode (100 kHz) and fast mode (400 kHz)

Ray Jui (4):
  i2c: iProc: define Broadcom iProc I2C binding
  i2c: iproc: Add Broadcom iProc I2C Driver
  ARM: mach-bcm: Enable I2C support for iProc
  ARM: dts: add I2C device nodes for Broadcom Cygnus

 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   20 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/i2c/busses/Kconfig                         |    9 +
 drivers/i2c/busses/Makefile                        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c                 |  503 ++++++++++++++++++++
 6 files changed, 571 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

-- 
1.7.9.5

[PATCH 0/4] Add I2C support to Broadcom iProc

[Ray Jui]

This patchset contains the initial I2C support for Broadcom iProc family of
SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has a
size of 64 bytes. The iProc I2C controller supports two bus speeds including
standard mode (100 kHz) and fast mode (400 kHz)

Ray Jui (4):
  i2c: iProc: define Broadcom iProc I2C binding
  i2c: iproc: Add Broadcom iProc I2C Driver
  ARM: mach-bcm: Enable I2C support for iProc
  ARM: dts: add I2C device nodes for Broadcom Cygnus

 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   20 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/i2c/busses/Kconfig                         |    9 +
 drivers/i2c/busses/Makefile                        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c                 |  503 ++++++++++++++++++++
 6 files changed, 571 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

-- 
1.7.9.5

[PATCH 0/4] Add I2C support to Broadcom iProc

[Ray Jui]

This patchset contains the initial I2C support for Broadcom iProc family of
SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has a
size of 64 bytes. The iProc I2C controller supports two bus speeds including
standard mode (100 kHz) and fast mode (400 kHz)

Ray Jui (4):
  i2c: iProc: define Broadcom iProc I2C binding
  i2c: iproc: Add Broadcom iProc I2C Driver
  ARM: mach-bcm: Enable I2C support for iProc
  ARM: dts: add I2C device nodes for Broadcom Cygnus

 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   20 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/i2c/busses/Kconfig                         |    9 +
 drivers/i2c/busses/Makefile                        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c                 |  503 ++++++++++++++++++++
 6 files changed, 571 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

-- 
1.7.9.5

[PATCH 1/4] i2c: iProc: define Broadcom iProc I2C binding

[Ray Jui]

Document the I2C device tree binding for Broadcom iProc family of
SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt

diff --git a/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
new file mode 100644
index 0000000..81f982c
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
@@ -0,0 +1,37 @@
+Broadcom iProc I2C controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,iproc-i2c"
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+    I2C controller registers
+
+- interrupts:
+    Should contain the I2C interrupt
+
+- clock-frequency:
+    This is the I2C bus clock. Need to be either 100000 or 400000
+
+- #address-cells:
+    Always 1 (for I2C addresses)
+
+- #size-cells:
+    Always 0
+
+Example:
+	i2c0: i2c@18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+
+		codec: wm8750@1a {
+			compatible = "wlf,wm8750";
+			reg = <0x1a>;
+		};
+	};
-- 
1.7.9.5

[PATCH 1/4] i2c: iProc: define Broadcom iProc I2C binding

[Ray Jui]

Document the I2C device tree binding for Broadcom iProc family of
SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt

diff --git a/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
new file mode 100644
index 0000000..81f982c
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
@@ -0,0 +1,37 @@
+Broadcom iProc I2C controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,iproc-i2c"
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+    I2C controller registers
+
+- interrupts:
+    Should contain the I2C interrupt
+
+- clock-frequency:
+    This is the I2C bus clock. Need to be either 100000 or 400000
+
+- #address-cells:
+    Always 1 (for I2C addresses)
+
+- #size-cells:
+    Always 0
+
+Example:
+	i2c0: i2c@18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+
+		codec: wm8750@1a {
+			compatible = "wlf,wm8750";
+			reg = <0x1a>;
+		};
+	};
-- 
1.7.9.5

[PATCH 1/4] i2c: iProc: define Broadcom iProc I2C binding

[Ray Jui]

Document the I2C device tree binding for Broadcom iProc family of
SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt

diff --git a/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
new file mode 100644
index 0000000..81f982c
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
@@ -0,0 +1,37 @@
+Broadcom iProc I2C controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,iproc-i2c"
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+    I2C controller registers
+
+- interrupts:
+    Should contain the I2C interrupt
+
+- clock-frequency:
+    This is the I2C bus clock. Need to be either 100000 or 400000
+
+- #address-cells:
+    Always 1 (for I2C addresses)
+
+- #size-cells:
+    Always 0
+
+Example:
+	i2c0: i2c at 18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+
+		codec: wm8750 at 1a {
+			compatible = "wlf,wm8750";
+			reg = <0x1a>;
+		};
+	};
-- 
1.7.9.5

[PATCH 2/4] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

Add initial support to the Broadcom iProc I2C controller found in the
iProc family of SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has
a size of 64 bytes. The iProc I2C controller supports two bus speeds
including standard mode (100kHz) and fast mode (400kHz)

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/i2c/busses/Kconfig         |    9 +
 drivers/i2c/busses/Makefile        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c |  503 ++++++++++++++++++++++++++++++++++++
 3 files changed, 513 insertions(+)
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index c1351d9..8a2eb7e 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -372,6 +372,15 @@ config I2C_BCM2835
 	  This support is also available as a module.  If so, the module
 	  will be called i2c-bcm2835.
 
+config I2C_BCM_IPROC
+	tristate "Broadcom iProc I2C controller"
+	depends on ARCH_BCM_IPROC
+	help
+	  If you say yes to this option, support will be included for the
+	  Broadcom iProc I2C controller.
+
+	  If you don't know what to do here, say N.
+
 config I2C_BCM_KONA
 	tristate "BCM Kona I2C adapter"
 	depends on ARCH_BCM_MOBILE
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 5e6c822..216e7be 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
 obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
 obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
 obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
+obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
 obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
 obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
 obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
new file mode 100644
index 0000000..0e6e603
--- /dev/null
+++ b/drivers/i2c/busses/i2c-bcm-iproc.c
@@ -0,0 +1,503 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+
+#define CFG_OFFSET                   0x00
+#define CFG_RESET_SHIFT              31
+#define CFG_EN_SHIFT                 30
+#define CFG_M_RETRY_CNT_SHIFT        16
+#define CFG_M_RETRY_CNT_MASK         0x0f
+
+#define TIM_CFG_OFFSET               0x04
+#define TIME_CFG_MODE_400_SHIFT      31
+
+#define M_FIFO_CTRL_OFFSET           0x0c
+#define M_FIFO_RX_FLUSH_SHIFT        31
+#define M_FIFO_TX_FLUSH_SHIFT        30
+#define M_FIFO_RX_CNT_SHIFT          16
+#define M_FIFO_RX_CNT_MASK           0x7f
+#define M_FIFO_RX_THLD_SHIFT         8
+#define M_FIFO_RX_THLD_MASK          0x3f
+
+#define M_CMD_OFFSET                 0x30
+#define M_CMD_START_BUSY_SHIFT       31
+#define M_CMD_STATUS_SHIFT           25
+#define M_CMD_STATUS_MASK            0x07
+#define M_CMD_STATUS_SUCCESS         0x0
+#define M_CMD_STATUS_LOST_ARB        0x1
+#define M_CMD_STATUS_NACK_ADDR       0x2
+#define M_CMD_STATUS_NACK_DATA       0x3
+#define M_CMD_STATUS_TIMEOUT         0x4
+#define M_CMD_PROTOCOL_SHIFT         9
+#define M_CMD_PROTOCOL_MASK          0xf
+#define M_CMD_PROTOCOL_BLK_WR        0x7
+#define M_CMD_PROTOCOL_BLK_RD        0x8
+#define M_CMD_PEC_SHIFT              8
+#define M_CMD_RD_CNT_SHIFT           0
+#define M_CMD_RD_CNT_MASK            0xff
+
+#define IE_OFFSET                    0x38
+#define IE_M_RX_FIFO_FULL_SHIFT      31
+#define IE_M_RX_THLD_SHIFT           30
+#define IE_M_START_BUSY_SHIFT        28
+
+#define IS_OFFSET                    0x3c
+#define IS_M_RX_FIFO_FULL_SHIFT      31
+#define IS_M_RX_THLD_SHIFT           30
+#define IS_M_START_BUSY_SHIFT        28
+
+#define M_TX_OFFSET                  0x40
+#define M_TX_WR_STATUS_SHIFT         31
+#define M_TX_DATA_SHIFT              0
+#define M_TX_DATA_MASK               0xff
+
+#define M_RX_OFFSET                  0x44
+#define M_RX_STATUS_SHIFT            30
+#define M_RX_STATUS_MASK             0x03
+#define M_RX_PEC_ERR_SHIFT           29
+#define M_RX_DATA_SHIFT              0
+#define M_RX_DATA_MASK               0xff
+
+#define I2C_TIMEOUT_MESC             100
+#define M_TX_RX_FIFO_SIZE            64
+
+enum bus_speed_index {
+	I2C_SPD_100K = 0,
+	I2C_SPD_400K,
+};
+
+struct bcm_iproc_i2c_dev {
+	struct device *device;
+
+	void __iomem *base;
+	struct i2c_msg *msg;
+
+	struct i2c_adapter adapter;
+
+	struct completion done;
+};
+
+/*
+ * Can be expanded in the future if more interrupt status bits are utilized
+ */
+#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
+
+static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
+{
+	struct bcm_iproc_i2c_dev *dev = data;
+	u32 status = readl(dev->base + IS_OFFSET);
+
+	status &= ISR_MASK;
+
+	if (!status)
+		return IRQ_NONE;
+
+	writel(status, dev->base + IS_OFFSET);
+	complete_all(&dev->done);
+
+	return IRQ_HANDLED;
+}
+
+static int __wait_for_bus_idle(struct bcm_iproc_i2c_dev *dev)
+{
+	unsigned long timeout = jiffies + msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	while (readl(dev->base + M_CMD_OFFSET) &
+			(1 << M_CMD_START_BUSY_SHIFT)) {
+		if (time_after(jiffies, timeout)) {
+			dev_err(dev->device, "wait for bus idle timeout\n");
+			return -ETIMEDOUT;
+		}
+	}
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *dev,
+		struct i2c_msg *msg, u8 *addr)
+{
+
+	if (msg->flags & I2C_M_TEN) {
+		dev_err(dev->device, "no support for 10-bit address\n");
+		return -EINVAL;
+	}
+
+	*addr = (msg->addr << 1) & 0xfe;
+
+	if (msg->flags & I2C_M_RD)
+		*addr |= 1;
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	val = readl(dev->base + M_CMD_OFFSET);
+	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
+
+	switch (val) {
+	case M_CMD_STATUS_SUCCESS:
+		return 0;
+
+	case M_CMD_STATUS_LOST_ARB:
+		dev_err(dev->device, "lost bus arbitration\n");
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_NACK_ADDR:
+		dev_err(dev->device, "NAK addr:0x%02x\n", dev->msg->addr);
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_NACK_DATA:
+		dev_err(dev->device, "NAK data\n");
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_TIMEOUT:
+		dev_err(dev->device, "bus timeout\n");
+		return -ETIMEDOUT;
+
+	default:
+		dev_err(dev->device, "unknown error code=%d\n", val);
+		return -EREMOTEIO;
+	}
+
+	return -EREMOTEIO;
+}
+
+static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *dev,
+		struct i2c_msg *msg)
+{
+	int ret, i;
+	u8 addr;
+	u32 val;
+	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	if (msg->len < 1 || msg->len > M_TX_RX_FIFO_SIZE - 1) {
+		dev_err(dev->device,
+			"supported data length is 1 - %u bytes\n",
+				M_TX_RX_FIFO_SIZE - 1);
+		return -EINVAL;
+	}
+
+	dev->msg = msg;
+	ret = __wait_for_bus_idle(dev);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_format_addr(dev, msg, &addr);
+	if (ret)
+		return ret;
+
+	/* load slave address into the TX FIFO */
+	writel(addr, dev->base + M_TX_OFFSET);
+
+	/* for a write transaction, load data into the TX FIFO */
+	if (!(msg->flags & I2C_M_RD)) {
+		for (i = 0; i < msg->len; i++) {
+			val = msg->buf[i];
+
+			/* mark the last byte */
+			if (i == msg->len - 1)
+				val |= 1 << M_TX_WR_STATUS_SHIFT;
+
+			writel(val, dev->base + M_TX_OFFSET);
+		}
+	}
+
+	/* mark as incomplete before starting the transaction */
+	reinit_completion(&dev->done);
+
+	/*
+	 * Enable the "start busy" interrupt, which will be triggered after
+	 * the transaction is done
+	 */
+	writel(1 << IE_M_START_BUSY_SHIFT, dev->base + IE_OFFSET);
+
+	/*
+	 * Now we can activate the transfer. For a read operation, specify the
+	 * number of bytes to read
+	 */
+	val = 1 << M_CMD_START_BUSY_SHIFT;
+	if (msg->flags & I2C_M_RD) {
+		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
+			(msg->len << M_CMD_RD_CNT_SHIFT);
+	} else {
+		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
+	}
+	writel(val, dev->base + M_CMD_OFFSET);
+
+	time_left = wait_for_completion_timeout(&dev->done, time_left);
+
+	/* disable all interrupts */
+	writel(0, dev->base + IE_OFFSET);
+
+	if (!time_left) {
+		dev_err(dev->device, "transaction times out\n");
+
+		/* flush FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+			(1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, dev->base + M_FIFO_CTRL_OFFSET);
+		return -EREMOTEIO;
+	}
+
+	ret = bcm_iproc_i2c_check_status(dev);
+	if (ret) {
+		/* flush both TX/RX FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+			(1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, dev->base + M_FIFO_CTRL_OFFSET);
+		return ret;
+	}
+
+	/*
+	 * For a read operation, we now need to load the data from FIFO
+	 * into the memory buffer
+	 */
+	if (msg->flags & I2C_M_RD) {
+		for (i = 0; i < msg->len; i++) {
+			msg->buf[i] = (readl(dev->base + M_RX_OFFSET) >>
+					M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
+		}
+	}
+
+	dev_dbg(dev->device, "xfer %c, addr=0x%02x, len=%d\n",
+			(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
+			msg->len);
+	dev_dbg(dev->device, "**** data start ****\n");
+	for (i = 0; i < msg->len; i++)
+		dev_dbg(dev->device, "0x%02x ",  msg->buf[i]);
+	dev_dbg(dev->device, "**** data end ****\n");
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
+			     struct i2c_msg msgs[], int num)
+{
+	struct bcm_iproc_i2c_dev *dev = i2c_get_adapdata(adapter);
+	int ret, i;
+
+	/* go through all messages */
+	for (i = 0; i < num; i++) {
+		ret = bcm_iproc_i2c_xfer_single_msg(dev, &msgs[i]);
+		if (ret) {
+			dev_err(dev->device, "xfer failed\n");
+			return ret;
+		}
+	}
+
+	return num;
+}
+
+static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm bcm_iproc_algo = {
+	.master_xfer = bcm_iproc_i2c_xfer,
+	.functionality = bcm_iproc_i2c_functionality,
+};
+
+static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *dev)
+{
+	unsigned int bus_speed, speed_bit;
+	u32 val;
+	int ret = of_property_read_u32(dev->device->of_node, "clock-frequency",
+				       &bus_speed);
+	if (ret < 0) {
+		dev_err(dev->device, "missing clock-frequency property\n");
+		return -ENODEV;
+	}
+
+	switch (bus_speed) {
+	case 100000:
+		speed_bit = 0;
+		break;
+	case 400000:
+		speed_bit = 1;
+		break;
+	default:
+		dev_err(dev->device, "%d Hz bus speed not supported\n",
+				bus_speed);
+		dev_err(dev->device, "valid speeds are 100khz and 400khz\n");
+		return -EINVAL;
+	}
+
+	val = readl(dev->base + TIM_CFG_OFFSET);
+	val &= ~(1 << TIME_CFG_MODE_400_SHIFT);
+	val |= speed_bit << TIME_CFG_MODE_400_SHIFT;
+	writel(val, dev->base + TIM_CFG_OFFSET);
+
+	dev_info(dev->device, "bus set to %u Hz\n", bus_speed);
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	/* put controller in reset */
+	val = readl(dev->base + CFG_OFFSET);
+	val |= 1 << CFG_RESET_SHIFT;
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, dev->base + CFG_OFFSET);
+
+	/* wait 100 usec per spec */
+	udelay(100);
+
+	/* bring controller out of reset */
+	val = readl(dev->base + CFG_OFFSET);
+	val &= ~(1 << CFG_RESET_SHIFT);
+	writel(val, dev->base + CFG_OFFSET);
+
+	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
+	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
+	writel(val, dev->base + M_FIFO_CTRL_OFFSET);
+
+	/* disable all interrupts */
+	val = 0;
+	writel(val, dev->base + IE_OFFSET);
+
+	/* clear all pending interrupts */
+	val = readl(dev->base + IS_OFFSET);
+	writel(val, dev->base + IS_OFFSET);
+
+	return 0;
+}
+
+static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	val = readl(dev->base + CFG_OFFSET);
+	val |= 1 << CFG_EN_SHIFT;
+	writel(val, dev->base + CFG_OFFSET);
+}
+
+static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	val = readl(dev->base + CFG_OFFSET);
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, dev->base + CFG_OFFSET);
+}
+
+static int bcm_iproc_i2c_probe(struct platform_device *pdev)
+{
+	int irq, ret = 0;
+	struct bcm_iproc_i2c_dev *dev;
+	struct i2c_adapter *adap;
+	struct resource *res;
+
+	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
+	if (!dev)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, dev);
+	dev->device = &pdev->dev;
+	init_completion(&dev->done);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -ENODEV;
+	dev->base = devm_ioremap_resource(dev->device, res);
+	if (IS_ERR(dev->base))
+		return -ENOMEM;
+
+	ret = bcm_iproc_i2c_init(dev);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_cfg_speed(dev);
+	if (ret)
+		return ret;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		dev_err(dev->device, "no irq resource\n");
+		return irq;
+	}
+
+	ret = devm_request_irq(&pdev->dev, irq, bcm_iproc_i2c_isr,
+			IRQF_SHARED, pdev->name, dev);
+	if (ret) {
+		dev_err(dev->device, "unable to request irq %i\n", irq);
+		return ret;
+	}
+
+	bcm_iproc_i2c_enable(dev);
+
+	adap = &dev->adapter;
+	i2c_set_adapdata(adap, dev);
+	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
+	adap->algo = &bcm_iproc_algo;
+	adap->dev.parent = &pdev->dev;
+	adap->dev.of_node = pdev->dev.of_node;
+
+	ret = i2c_add_adapter(adap);
+	if (ret) {
+		dev_err(dev->device, "failed to add adapter\n");
+		return ret;
+	}
+
+	dev_info(dev->device, "device registered successfully\n");
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_remove(struct platform_device *pdev)
+{
+	struct bcm_iproc_i2c_dev *dev = platform_get_drvdata(pdev);
+
+	i2c_del_adapter(&dev->adapter);
+	bcm_iproc_i2c_disable(dev);
+
+	return 0;
+}
+
+static const struct of_device_id bcm_iproc_i2c_of_match[] = {
+	{.compatible = "brcm,iproc-i2c",},
+	{},
+};
+MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
+
+static struct platform_driver bcm_iproc_i2c_driver = {
+	.driver = {
+		   .name = "bcm-iproc-i2c",
+		   .owner = THIS_MODULE,
+		   .of_match_table = bcm_iproc_i2c_of_match,
+		   },
+	.probe = bcm_iproc_i2c_probe,
+	.remove = bcm_iproc_i2c_remove,
+};
+module_platform_driver(bcm_iproc_i2c_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH 2/4] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

Add initial support to the Broadcom iProc I2C controller found in the
iProc family of SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has
a size of 64 bytes. The iProc I2C controller supports two bus speeds
including standard mode (100kHz) and fast mode (400kHz)

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/i2c/busses/Kconfig         |    9 +
 drivers/i2c/busses/Makefile        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c |  503 ++++++++++++++++++++++++++++++++++++
 3 files changed, 513 insertions(+)
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index c1351d9..8a2eb7e 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -372,6 +372,15 @@ config I2C_BCM2835
 	  This support is also available as a module.  If so, the module
 	  will be called i2c-bcm2835.
 
+config I2C_BCM_IPROC
+	tristate "Broadcom iProc I2C controller"
+	depends on ARCH_BCM_IPROC
+	help
+	  If you say yes to this option, support will be included for the
+	  Broadcom iProc I2C controller.
+
+	  If you don't know what to do here, say N.
+
 config I2C_BCM_KONA
 	tristate "BCM Kona I2C adapter"
 	depends on ARCH_BCM_MOBILE
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 5e6c822..216e7be 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
 obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
 obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
 obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
+obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
 obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
 obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
 obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
new file mode 100644
index 0000000..0e6e603
--- /dev/null
+++ b/drivers/i2c/busses/i2c-bcm-iproc.c
@@ -0,0 +1,503 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+
+#define CFG_OFFSET                   0x00
+#define CFG_RESET_SHIFT              31
+#define CFG_EN_SHIFT                 30
+#define CFG_M_RETRY_CNT_SHIFT        16
+#define CFG_M_RETRY_CNT_MASK         0x0f
+
+#define TIM_CFG_OFFSET               0x04
+#define TIME_CFG_MODE_400_SHIFT      31
+
+#define M_FIFO_CTRL_OFFSET           0x0c
+#define M_FIFO_RX_FLUSH_SHIFT        31
+#define M_FIFO_TX_FLUSH_SHIFT        30
+#define M_FIFO_RX_CNT_SHIFT          16
+#define M_FIFO_RX_CNT_MASK           0x7f
+#define M_FIFO_RX_THLD_SHIFT         8
+#define M_FIFO_RX_THLD_MASK          0x3f
+
+#define M_CMD_OFFSET                 0x30
+#define M_CMD_START_BUSY_SHIFT       31
+#define M_CMD_STATUS_SHIFT           25
+#define M_CMD_STATUS_MASK            0x07
+#define M_CMD_STATUS_SUCCESS         0x0
+#define M_CMD_STATUS_LOST_ARB        0x1
+#define M_CMD_STATUS_NACK_ADDR       0x2
+#define M_CMD_STATUS_NACK_DATA       0x3
+#define M_CMD_STATUS_TIMEOUT         0x4
+#define M_CMD_PROTOCOL_SHIFT         9
+#define M_CMD_PROTOCOL_MASK          0xf
+#define M_CMD_PROTOCOL_BLK_WR        0x7
+#define M_CMD_PROTOCOL_BLK_RD        0x8
+#define M_CMD_PEC_SHIFT              8
+#define M_CMD_RD_CNT_SHIFT           0
+#define M_CMD_RD_CNT_MASK            0xff
+
+#define IE_OFFSET                    0x38
+#define IE_M_RX_FIFO_FULL_SHIFT      31
+#define IE_M_RX_THLD_SHIFT           30
+#define IE_M_START_BUSY_SHIFT        28
+
+#define IS_OFFSET                    0x3c
+#define IS_M_RX_FIFO_FULL_SHIFT      31
+#define IS_M_RX_THLD_SHIFT           30
+#define IS_M_START_BUSY_SHIFT        28
+
+#define M_TX_OFFSET                  0x40
+#define M_TX_WR_STATUS_SHIFT         31
+#define M_TX_DATA_SHIFT              0
+#define M_TX_DATA_MASK               0xff
+
+#define M_RX_OFFSET                  0x44
+#define M_RX_STATUS_SHIFT            30
+#define M_RX_STATUS_MASK             0x03
+#define M_RX_PEC_ERR_SHIFT           29
+#define M_RX_DATA_SHIFT              0
+#define M_RX_DATA_MASK               0xff
+
+#define I2C_TIMEOUT_MESC             100
+#define M_TX_RX_FIFO_SIZE            64
+
+enum bus_speed_index {
+	I2C_SPD_100K = 0,
+	I2C_SPD_400K,
+};
+
+struct bcm_iproc_i2c_dev {
+	struct device *device;
+
+	void __iomem *base;
+	struct i2c_msg *msg;
+
+	struct i2c_adapter adapter;
+
+	struct completion done;
+};
+
+/*
+ * Can be expanded in the future if more interrupt status bits are utilized
+ */
+#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
+
+static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
+{
+	struct bcm_iproc_i2c_dev *dev = data;
+	u32 status = readl(dev->base + IS_OFFSET);
+
+	status &= ISR_MASK;
+
+	if (!status)
+		return IRQ_NONE;
+
+	writel(status, dev->base + IS_OFFSET);
+	complete_all(&dev->done);
+
+	return IRQ_HANDLED;
+}
+
+static int __wait_for_bus_idle(struct bcm_iproc_i2c_dev *dev)
+{
+	unsigned long timeout = jiffies + msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	while (readl(dev->base + M_CMD_OFFSET) &
+			(1 << M_CMD_START_BUSY_SHIFT)) {
+		if (time_after(jiffies, timeout)) {
+			dev_err(dev->device, "wait for bus idle timeout\n");
+			return -ETIMEDOUT;
+		}
+	}
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *dev,
+		struct i2c_msg *msg, u8 *addr)
+{
+
+	if (msg->flags & I2C_M_TEN) {
+		dev_err(dev->device, "no support for 10-bit address\n");
+		return -EINVAL;
+	}
+
+	*addr = (msg->addr << 1) & 0xfe;
+
+	if (msg->flags & I2C_M_RD)
+		*addr |= 1;
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	val = readl(dev->base + M_CMD_OFFSET);
+	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
+
+	switch (val) {
+	case M_CMD_STATUS_SUCCESS:
+		return 0;
+
+	case M_CMD_STATUS_LOST_ARB:
+		dev_err(dev->device, "lost bus arbitration\n");
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_NACK_ADDR:
+		dev_err(dev->device, "NAK addr:0x%02x\n", dev->msg->addr);
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_NACK_DATA:
+		dev_err(dev->device, "NAK data\n");
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_TIMEOUT:
+		dev_err(dev->device, "bus timeout\n");
+		return -ETIMEDOUT;
+
+	default:
+		dev_err(dev->device, "unknown error code=%d\n", val);
+		return -EREMOTEIO;
+	}
+
+	return -EREMOTEIO;
+}
+
+static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *dev,
+		struct i2c_msg *msg)
+{
+	int ret, i;
+	u8 addr;
+	u32 val;
+	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	if (msg->len < 1 || msg->len > M_TX_RX_FIFO_SIZE - 1) {
+		dev_err(dev->device,
+			"supported data length is 1 - %u bytes\n",
+				M_TX_RX_FIFO_SIZE - 1);
+		return -EINVAL;
+	}
+
+	dev->msg = msg;
+	ret = __wait_for_bus_idle(dev);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_format_addr(dev, msg, &addr);
+	if (ret)
+		return ret;
+
+	/* load slave address into the TX FIFO */
+	writel(addr, dev->base + M_TX_OFFSET);
+
+	/* for a write transaction, load data into the TX FIFO */
+	if (!(msg->flags & I2C_M_RD)) {
+		for (i = 0; i < msg->len; i++) {
+			val = msg->buf[i];
+
+			/* mark the last byte */
+			if (i == msg->len - 1)
+				val |= 1 << M_TX_WR_STATUS_SHIFT;
+
+			writel(val, dev->base + M_TX_OFFSET);
+		}
+	}
+
+	/* mark as incomplete before starting the transaction */
+	reinit_completion(&dev->done);
+
+	/*
+	 * Enable the "start busy" interrupt, which will be triggered after
+	 * the transaction is done
+	 */
+	writel(1 << IE_M_START_BUSY_SHIFT, dev->base + IE_OFFSET);
+
+	/*
+	 * Now we can activate the transfer. For a read operation, specify the
+	 * number of bytes to read
+	 */
+	val = 1 << M_CMD_START_BUSY_SHIFT;
+	if (msg->flags & I2C_M_RD) {
+		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
+			(msg->len << M_CMD_RD_CNT_SHIFT);
+	} else {
+		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
+	}
+	writel(val, dev->base + M_CMD_OFFSET);
+
+	time_left = wait_for_completion_timeout(&dev->done, time_left);
+
+	/* disable all interrupts */
+	writel(0, dev->base + IE_OFFSET);
+
+	if (!time_left) {
+		dev_err(dev->device, "transaction times out\n");
+
+		/* flush FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+			(1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, dev->base + M_FIFO_CTRL_OFFSET);
+		return -EREMOTEIO;
+	}
+
+	ret = bcm_iproc_i2c_check_status(dev);
+	if (ret) {
+		/* flush both TX/RX FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+			(1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, dev->base + M_FIFO_CTRL_OFFSET);
+		return ret;
+	}
+
+	/*
+	 * For a read operation, we now need to load the data from FIFO
+	 * into the memory buffer
+	 */
+	if (msg->flags & I2C_M_RD) {
+		for (i = 0; i < msg->len; i++) {
+			msg->buf[i] = (readl(dev->base + M_RX_OFFSET) >>
+					M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
+		}
+	}
+
+	dev_dbg(dev->device, "xfer %c, addr=0x%02x, len=%d\n",
+			(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
+			msg->len);
+	dev_dbg(dev->device, "**** data start ****\n");
+	for (i = 0; i < msg->len; i++)
+		dev_dbg(dev->device, "0x%02x ",  msg->buf[i]);
+	dev_dbg(dev->device, "**** data end ****\n");
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
+			     struct i2c_msg msgs[], int num)
+{
+	struct bcm_iproc_i2c_dev *dev = i2c_get_adapdata(adapter);
+	int ret, i;
+
+	/* go through all messages */
+	for (i = 0; i < num; i++) {
+		ret = bcm_iproc_i2c_xfer_single_msg(dev, &msgs[i]);
+		if (ret) {
+			dev_err(dev->device, "xfer failed\n");
+			return ret;
+		}
+	}
+
+	return num;
+}
+
+static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm bcm_iproc_algo = {
+	.master_xfer = bcm_iproc_i2c_xfer,
+	.functionality = bcm_iproc_i2c_functionality,
+};
+
+static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *dev)
+{
+	unsigned int bus_speed, speed_bit;
+	u32 val;
+	int ret = of_property_read_u32(dev->device->of_node, "clock-frequency",
+				       &bus_speed);
+	if (ret < 0) {
+		dev_err(dev->device, "missing clock-frequency property\n");
+		return -ENODEV;
+	}
+
+	switch (bus_speed) {
+	case 100000:
+		speed_bit = 0;
+		break;
+	case 400000:
+		speed_bit = 1;
+		break;
+	default:
+		dev_err(dev->device, "%d Hz bus speed not supported\n",
+				bus_speed);
+		dev_err(dev->device, "valid speeds are 100khz and 400khz\n");
+		return -EINVAL;
+	}
+
+	val = readl(dev->base + TIM_CFG_OFFSET);
+	val &= ~(1 << TIME_CFG_MODE_400_SHIFT);
+	val |= speed_bit << TIME_CFG_MODE_400_SHIFT;
+	writel(val, dev->base + TIM_CFG_OFFSET);
+
+	dev_info(dev->device, "bus set to %u Hz\n", bus_speed);
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	/* put controller in reset */
+	val = readl(dev->base + CFG_OFFSET);
+	val |= 1 << CFG_RESET_SHIFT;
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, dev->base + CFG_OFFSET);
+
+	/* wait 100 usec per spec */
+	udelay(100);
+
+	/* bring controller out of reset */
+	val = readl(dev->base + CFG_OFFSET);
+	val &= ~(1 << CFG_RESET_SHIFT);
+	writel(val, dev->base + CFG_OFFSET);
+
+	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
+	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
+	writel(val, dev->base + M_FIFO_CTRL_OFFSET);
+
+	/* disable all interrupts */
+	val = 0;
+	writel(val, dev->base + IE_OFFSET);
+
+	/* clear all pending interrupts */
+	val = readl(dev->base + IS_OFFSET);
+	writel(val, dev->base + IS_OFFSET);
+
+	return 0;
+}
+
+static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	val = readl(dev->base + CFG_OFFSET);
+	val |= 1 << CFG_EN_SHIFT;
+	writel(val, dev->base + CFG_OFFSET);
+}
+
+static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	val = readl(dev->base + CFG_OFFSET);
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, dev->base + CFG_OFFSET);
+}
+
+static int bcm_iproc_i2c_probe(struct platform_device *pdev)
+{
+	int irq, ret = 0;
+	struct bcm_iproc_i2c_dev *dev;
+	struct i2c_adapter *adap;
+	struct resource *res;
+
+	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
+	if (!dev)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, dev);
+	dev->device = &pdev->dev;
+	init_completion(&dev->done);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -ENODEV;
+	dev->base = devm_ioremap_resource(dev->device, res);
+	if (IS_ERR(dev->base))
+		return -ENOMEM;
+
+	ret = bcm_iproc_i2c_init(dev);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_cfg_speed(dev);
+	if (ret)
+		return ret;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		dev_err(dev->device, "no irq resource\n");
+		return irq;
+	}
+
+	ret = devm_request_irq(&pdev->dev, irq, bcm_iproc_i2c_isr,
+			IRQF_SHARED, pdev->name, dev);
+	if (ret) {
+		dev_err(dev->device, "unable to request irq %i\n", irq);
+		return ret;
+	}
+
+	bcm_iproc_i2c_enable(dev);
+
+	adap = &dev->adapter;
+	i2c_set_adapdata(adap, dev);
+	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
+	adap->algo = &bcm_iproc_algo;
+	adap->dev.parent = &pdev->dev;
+	adap->dev.of_node = pdev->dev.of_node;
+
+	ret = i2c_add_adapter(adap);
+	if (ret) {
+		dev_err(dev->device, "failed to add adapter\n");
+		return ret;
+	}
+
+	dev_info(dev->device, "device registered successfully\n");
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_remove(struct platform_device *pdev)
+{
+	struct bcm_iproc_i2c_dev *dev = platform_get_drvdata(pdev);
+
+	i2c_del_adapter(&dev->adapter);
+	bcm_iproc_i2c_disable(dev);
+
+	return 0;
+}
+
+static const struct of_device_id bcm_iproc_i2c_of_match[] = {
+	{.compatible = "brcm,iproc-i2c",},
+	{},
+};
+MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
+
+static struct platform_driver bcm_iproc_i2c_driver = {
+	.driver = {
+		   .name = "bcm-iproc-i2c",
+		   .owner = THIS_MODULE,
+		   .of_match_table = bcm_iproc_i2c_of_match,
+		   },
+	.probe = bcm_iproc_i2c_probe,
+	.remove = bcm_iproc_i2c_remove,
+};
+module_platform_driver(bcm_iproc_i2c_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH 2/4] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

Add initial support to the Broadcom iProc I2C controller found in the
iProc family of SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has
a size of 64 bytes. The iProc I2C controller supports two bus speeds
including standard mode (100kHz) and fast mode (400kHz)

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/i2c/busses/Kconfig         |    9 +
 drivers/i2c/busses/Makefile        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c |  503 ++++++++++++++++++++++++++++++++++++
 3 files changed, 513 insertions(+)
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index c1351d9..8a2eb7e 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -372,6 +372,15 @@ config I2C_BCM2835
 	  This support is also available as a module.  If so, the module
 	  will be called i2c-bcm2835.
 
+config I2C_BCM_IPROC
+	tristate "Broadcom iProc I2C controller"
+	depends on ARCH_BCM_IPROC
+	help
+	  If you say yes to this option, support will be included for the
+	  Broadcom iProc I2C controller.
+
+	  If you don't know what to do here, say N.
+
 config I2C_BCM_KONA
 	tristate "BCM Kona I2C adapter"
 	depends on ARCH_BCM_MOBILE
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 5e6c822..216e7be 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
 obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
 obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
 obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
+obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
 obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
 obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
 obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
new file mode 100644
index 0000000..0e6e603
--- /dev/null
+++ b/drivers/i2c/busses/i2c-bcm-iproc.c
@@ -0,0 +1,503 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+
+#define CFG_OFFSET                   0x00
+#define CFG_RESET_SHIFT              31
+#define CFG_EN_SHIFT                 30
+#define CFG_M_RETRY_CNT_SHIFT        16
+#define CFG_M_RETRY_CNT_MASK         0x0f
+
+#define TIM_CFG_OFFSET               0x04
+#define TIME_CFG_MODE_400_SHIFT      31
+
+#define M_FIFO_CTRL_OFFSET           0x0c
+#define M_FIFO_RX_FLUSH_SHIFT        31
+#define M_FIFO_TX_FLUSH_SHIFT        30
+#define M_FIFO_RX_CNT_SHIFT          16
+#define M_FIFO_RX_CNT_MASK           0x7f
+#define M_FIFO_RX_THLD_SHIFT         8
+#define M_FIFO_RX_THLD_MASK          0x3f
+
+#define M_CMD_OFFSET                 0x30
+#define M_CMD_START_BUSY_SHIFT       31
+#define M_CMD_STATUS_SHIFT           25
+#define M_CMD_STATUS_MASK            0x07
+#define M_CMD_STATUS_SUCCESS         0x0
+#define M_CMD_STATUS_LOST_ARB        0x1
+#define M_CMD_STATUS_NACK_ADDR       0x2
+#define M_CMD_STATUS_NACK_DATA       0x3
+#define M_CMD_STATUS_TIMEOUT         0x4
+#define M_CMD_PROTOCOL_SHIFT         9
+#define M_CMD_PROTOCOL_MASK          0xf
+#define M_CMD_PROTOCOL_BLK_WR        0x7
+#define M_CMD_PROTOCOL_BLK_RD        0x8
+#define M_CMD_PEC_SHIFT              8
+#define M_CMD_RD_CNT_SHIFT           0
+#define M_CMD_RD_CNT_MASK            0xff
+
+#define IE_OFFSET                    0x38
+#define IE_M_RX_FIFO_FULL_SHIFT      31
+#define IE_M_RX_THLD_SHIFT           30
+#define IE_M_START_BUSY_SHIFT        28
+
+#define IS_OFFSET                    0x3c
+#define IS_M_RX_FIFO_FULL_SHIFT      31
+#define IS_M_RX_THLD_SHIFT           30
+#define IS_M_START_BUSY_SHIFT        28
+
+#define M_TX_OFFSET                  0x40
+#define M_TX_WR_STATUS_SHIFT         31
+#define M_TX_DATA_SHIFT              0
+#define M_TX_DATA_MASK               0xff
+
+#define M_RX_OFFSET                  0x44
+#define M_RX_STATUS_SHIFT            30
+#define M_RX_STATUS_MASK             0x03
+#define M_RX_PEC_ERR_SHIFT           29
+#define M_RX_DATA_SHIFT              0
+#define M_RX_DATA_MASK               0xff
+
+#define I2C_TIMEOUT_MESC             100
+#define M_TX_RX_FIFO_SIZE            64
+
+enum bus_speed_index {
+	I2C_SPD_100K = 0,
+	I2C_SPD_400K,
+};
+
+struct bcm_iproc_i2c_dev {
+	struct device *device;
+
+	void __iomem *base;
+	struct i2c_msg *msg;
+
+	struct i2c_adapter adapter;
+
+	struct completion done;
+};
+
+/*
+ * Can be expanded in the future if more interrupt status bits are utilized
+ */
+#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
+
+static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
+{
+	struct bcm_iproc_i2c_dev *dev = data;
+	u32 status = readl(dev->base + IS_OFFSET);
+
+	status &= ISR_MASK;
+
+	if (!status)
+		return IRQ_NONE;
+
+	writel(status, dev->base + IS_OFFSET);
+	complete_all(&dev->done);
+
+	return IRQ_HANDLED;
+}
+
+static int __wait_for_bus_idle(struct bcm_iproc_i2c_dev *dev)
+{
+	unsigned long timeout = jiffies + msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	while (readl(dev->base + M_CMD_OFFSET) &
+			(1 << M_CMD_START_BUSY_SHIFT)) {
+		if (time_after(jiffies, timeout)) {
+			dev_err(dev->device, "wait for bus idle timeout\n");
+			return -ETIMEDOUT;
+		}
+	}
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *dev,
+		struct i2c_msg *msg, u8 *addr)
+{
+
+	if (msg->flags & I2C_M_TEN) {
+		dev_err(dev->device, "no support for 10-bit address\n");
+		return -EINVAL;
+	}
+
+	*addr = (msg->addr << 1) & 0xfe;
+
+	if (msg->flags & I2C_M_RD)
+		*addr |= 1;
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	val = readl(dev->base + M_CMD_OFFSET);
+	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
+
+	switch (val) {
+	case M_CMD_STATUS_SUCCESS:
+		return 0;
+
+	case M_CMD_STATUS_LOST_ARB:
+		dev_err(dev->device, "lost bus arbitration\n");
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_NACK_ADDR:
+		dev_err(dev->device, "NAK addr:0x%02x\n", dev->msg->addr);
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_NACK_DATA:
+		dev_err(dev->device, "NAK data\n");
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_TIMEOUT:
+		dev_err(dev->device, "bus timeout\n");
+		return -ETIMEDOUT;
+
+	default:
+		dev_err(dev->device, "unknown error code=%d\n", val);
+		return -EREMOTEIO;
+	}
+
+	return -EREMOTEIO;
+}
+
+static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *dev,
+		struct i2c_msg *msg)
+{
+	int ret, i;
+	u8 addr;
+	u32 val;
+	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	if (msg->len < 1 || msg->len > M_TX_RX_FIFO_SIZE - 1) {
+		dev_err(dev->device,
+			"supported data length is 1 - %u bytes\n",
+				M_TX_RX_FIFO_SIZE - 1);
+		return -EINVAL;
+	}
+
+	dev->msg = msg;
+	ret = __wait_for_bus_idle(dev);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_format_addr(dev, msg, &addr);
+	if (ret)
+		return ret;
+
+	/* load slave address into the TX FIFO */
+	writel(addr, dev->base + M_TX_OFFSET);
+
+	/* for a write transaction, load data into the TX FIFO */
+	if (!(msg->flags & I2C_M_RD)) {
+		for (i = 0; i < msg->len; i++) {
+			val = msg->buf[i];
+
+			/* mark the last byte */
+			if (i == msg->len - 1)
+				val |= 1 << M_TX_WR_STATUS_SHIFT;
+
+			writel(val, dev->base + M_TX_OFFSET);
+		}
+	}
+
+	/* mark as incomplete before starting the transaction */
+	reinit_completion(&dev->done);
+
+	/*
+	 * Enable the "start busy" interrupt, which will be triggered after
+	 * the transaction is done
+	 */
+	writel(1 << IE_M_START_BUSY_SHIFT, dev->base + IE_OFFSET);
+
+	/*
+	 * Now we can activate the transfer. For a read operation, specify the
+	 * number of bytes to read
+	 */
+	val = 1 << M_CMD_START_BUSY_SHIFT;
+	if (msg->flags & I2C_M_RD) {
+		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
+			(msg->len << M_CMD_RD_CNT_SHIFT);
+	} else {
+		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
+	}
+	writel(val, dev->base + M_CMD_OFFSET);
+
+	time_left = wait_for_completion_timeout(&dev->done, time_left);
+
+	/* disable all interrupts */
+	writel(0, dev->base + IE_OFFSET);
+
+	if (!time_left) {
+		dev_err(dev->device, "transaction times out\n");
+
+		/* flush FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+			(1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, dev->base + M_FIFO_CTRL_OFFSET);
+		return -EREMOTEIO;
+	}
+
+	ret = bcm_iproc_i2c_check_status(dev);
+	if (ret) {
+		/* flush both TX/RX FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+			(1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, dev->base + M_FIFO_CTRL_OFFSET);
+		return ret;
+	}
+
+	/*
+	 * For a read operation, we now need to load the data from FIFO
+	 * into the memory buffer
+	 */
+	if (msg->flags & I2C_M_RD) {
+		for (i = 0; i < msg->len; i++) {
+			msg->buf[i] = (readl(dev->base + M_RX_OFFSET) >>
+					M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
+		}
+	}
+
+	dev_dbg(dev->device, "xfer %c, addr=0x%02x, len=%d\n",
+			(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
+			msg->len);
+	dev_dbg(dev->device, "**** data start ****\n");
+	for (i = 0; i < msg->len; i++)
+		dev_dbg(dev->device, "0x%02x ",  msg->buf[i]);
+	dev_dbg(dev->device, "**** data end ****\n");
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
+			     struct i2c_msg msgs[], int num)
+{
+	struct bcm_iproc_i2c_dev *dev = i2c_get_adapdata(adapter);
+	int ret, i;
+
+	/* go through all messages */
+	for (i = 0; i < num; i++) {
+		ret = bcm_iproc_i2c_xfer_single_msg(dev, &msgs[i]);
+		if (ret) {
+			dev_err(dev->device, "xfer failed\n");
+			return ret;
+		}
+	}
+
+	return num;
+}
+
+static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm bcm_iproc_algo = {
+	.master_xfer = bcm_iproc_i2c_xfer,
+	.functionality = bcm_iproc_i2c_functionality,
+};
+
+static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *dev)
+{
+	unsigned int bus_speed, speed_bit;
+	u32 val;
+	int ret = of_property_read_u32(dev->device->of_node, "clock-frequency",
+				       &bus_speed);
+	if (ret < 0) {
+		dev_err(dev->device, "missing clock-frequency property\n");
+		return -ENODEV;
+	}
+
+	switch (bus_speed) {
+	case 100000:
+		speed_bit = 0;
+		break;
+	case 400000:
+		speed_bit = 1;
+		break;
+	default:
+		dev_err(dev->device, "%d Hz bus speed not supported\n",
+				bus_speed);
+		dev_err(dev->device, "valid speeds are 100khz and 400khz\n");
+		return -EINVAL;
+	}
+
+	val = readl(dev->base + TIM_CFG_OFFSET);
+	val &= ~(1 << TIME_CFG_MODE_400_SHIFT);
+	val |= speed_bit << TIME_CFG_MODE_400_SHIFT;
+	writel(val, dev->base + TIM_CFG_OFFSET);
+
+	dev_info(dev->device, "bus set to %u Hz\n", bus_speed);
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	/* put controller in reset */
+	val = readl(dev->base + CFG_OFFSET);
+	val |= 1 << CFG_RESET_SHIFT;
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, dev->base + CFG_OFFSET);
+
+	/* wait 100 usec per spec */
+	udelay(100);
+
+	/* bring controller out of reset */
+	val = readl(dev->base + CFG_OFFSET);
+	val &= ~(1 << CFG_RESET_SHIFT);
+	writel(val, dev->base + CFG_OFFSET);
+
+	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
+	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
+	writel(val, dev->base + M_FIFO_CTRL_OFFSET);
+
+	/* disable all interrupts */
+	val = 0;
+	writel(val, dev->base + IE_OFFSET);
+
+	/* clear all pending interrupts */
+	val = readl(dev->base + IS_OFFSET);
+	writel(val, dev->base + IS_OFFSET);
+
+	return 0;
+}
+
+static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	val = readl(dev->base + CFG_OFFSET);
+	val |= 1 << CFG_EN_SHIFT;
+	writel(val, dev->base + CFG_OFFSET);
+}
+
+static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	val = readl(dev->base + CFG_OFFSET);
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, dev->base + CFG_OFFSET);
+}
+
+static int bcm_iproc_i2c_probe(struct platform_device *pdev)
+{
+	int irq, ret = 0;
+	struct bcm_iproc_i2c_dev *dev;
+	struct i2c_adapter *adap;
+	struct resource *res;
+
+	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
+	if (!dev)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, dev);
+	dev->device = &pdev->dev;
+	init_completion(&dev->done);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -ENODEV;
+	dev->base = devm_ioremap_resource(dev->device, res);
+	if (IS_ERR(dev->base))
+		return -ENOMEM;
+
+	ret = bcm_iproc_i2c_init(dev);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_cfg_speed(dev);
+	if (ret)
+		return ret;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		dev_err(dev->device, "no irq resource\n");
+		return irq;
+	}
+
+	ret = devm_request_irq(&pdev->dev, irq, bcm_iproc_i2c_isr,
+			IRQF_SHARED, pdev->name, dev);
+	if (ret) {
+		dev_err(dev->device, "unable to request irq %i\n", irq);
+		return ret;
+	}
+
+	bcm_iproc_i2c_enable(dev);
+
+	adap = &dev->adapter;
+	i2c_set_adapdata(adap, dev);
+	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
+	adap->algo = &bcm_iproc_algo;
+	adap->dev.parent = &pdev->dev;
+	adap->dev.of_node = pdev->dev.of_node;
+
+	ret = i2c_add_adapter(adap);
+	if (ret) {
+		dev_err(dev->device, "failed to add adapter\n");
+		return ret;
+	}
+
+	dev_info(dev->device, "device registered successfully\n");
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_remove(struct platform_device *pdev)
+{
+	struct bcm_iproc_i2c_dev *dev = platform_get_drvdata(pdev);
+
+	i2c_del_adapter(&dev->adapter);
+	bcm_iproc_i2c_disable(dev);
+
+	return 0;
+}
+
+static const struct of_device_id bcm_iproc_i2c_of_match[] = {
+	{.compatible = "brcm,iproc-i2c",},
+	{},
+};
+MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
+
+static struct platform_driver bcm_iproc_i2c_driver = {
+	.driver = {
+		   .name = "bcm-iproc-i2c",
+		   .owner = THIS_MODULE,
+		   .of_match_table = bcm_iproc_i2c_of_match,
+		   },
+	.probe = bcm_iproc_i2c_probe,
+	.remove = bcm_iproc_i2c_remove,
+};
+module_platform_driver(bcm_iproc_i2c_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH 3/4] ARM: mach-bcm: Enable I2C support for iProc

[Ray Jui]

Enable I2C driver support for Broadcom iProc family of SoCs by
selecting I2C_BCM_IPROC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/mach-bcm/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index aaeec78..86ee90b 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -19,6 +19,7 @@ config ARCH_BCM_IPROC
 	select ARCH_REQUIRE_GPIOLIB
 	select ARM_AMBA
 	select PINCTRL
+	select I2C_BCM_IPROC
 	help
 	  This enables support for systems based on Broadcom IPROC architected SoCs.
 	  The IPROC complex contains one or more ARM CPUs along with common
-- 
1.7.9.5

[PATCH 3/4] ARM: mach-bcm: Enable I2C support for iProc

[Ray Jui]

Enable I2C driver support for Broadcom iProc family of SoCs by
selecting I2C_BCM_IPROC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/mach-bcm/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index aaeec78..86ee90b 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -19,6 +19,7 @@ config ARCH_BCM_IPROC
 	select ARCH_REQUIRE_GPIOLIB
 	select ARM_AMBA
 	select PINCTRL
+	select I2C_BCM_IPROC
 	help
 	  This enables support for systems based on Broadcom IPROC architected SoCs.
 	  The IPROC complex contains one or more ARM CPUs along with common
-- 
1.7.9.5

[PATCH 3/4] ARM: mach-bcm: Enable I2C support for iProc

[Ray Jui]

Enable I2C driver support for Broadcom iProc family of SoCs by
selecting I2C_BCM_IPROC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/mach-bcm/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index aaeec78..86ee90b 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -19,6 +19,7 @@ config ARCH_BCM_IPROC
 	select ARCH_REQUIRE_GPIOLIB
 	select ARM_AMBA
 	select PINCTRL
+	select I2C_BCM_IPROC
 	help
 	  This enables support for systems based on Broadcom IPROC architected SoCs.
 	  The IPROC complex contains one or more ARM CPUs along with common
-- 
1.7.9.5

[PATCH 4/4] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
them disabled there. Individual I2C devices can be enabled in board
specific dts file when I2C slave devices are enabled in the future

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..f7d6c1d 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -70,6 +70,26 @@
 		};
 	};
 
+	i2c0: i2c@18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
+	i2c1: i2c@1800b000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x1800b000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 86 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
 	uart0: serial@18020000 {
 		compatible = "snps,dw-apb-uart";
 		reg = <0x18020000 0x100>;
-- 
1.7.9.5

[PATCH 4/4] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
them disabled there. Individual I2C devices can be enabled in board
specific dts file when I2C slave devices are enabled in the future

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..f7d6c1d 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -70,6 +70,26 @@
 		};
 	};
 
+	i2c0: i2c@18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
+	i2c1: i2c@1800b000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x1800b000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 86 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
 	uart0: serial@18020000 {
 		compatible = "snps,dw-apb-uart";
 		reg = <0x18020000 0x100>;
-- 
1.7.9.5

[PATCH 4/4] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
them disabled there. Individual I2C devices can be enabled in board
specific dts file when I2C slave devices are enabled in the future

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..f7d6c1d 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -70,6 +70,26 @@
 		};
 	};
 
+	i2c0: i2c at 18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
+	i2c1: i2c at 1800b000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x1800b000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 86 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
 	uart0: serial at 18020000 {
 		compatible = "snps,dw-apb-uart";
 		reg = <0x18020000 0x100>;
-- 
1.7.9.5

Re: [PATCH 1/4] i2c: iProc: define Broadcom iProc I2C binding

[Varka Bhadram]

Hi,

On Wednesday 10 December 2014 06:24 AM, Ray Jui wrote:
> Document the I2C device tree binding for Broadcom iProc family of
> SoCs
>
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> ---
>   .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++++++++++++++++++++
>   1 file changed, 37 insertions(+)
>   create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
>
> diff --git a/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
> new file mode 100644
> index 0000000..81f982c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
> @@ -0,0 +1,37 @@
> +Broadcom iProc I2C controller
> +
> +Required properties:
> +
> +- compatible:
> +    Must be "brcm,iproc-i2c"
> +
> +- reg:
> +    Define the base and range of the I/O address space that contain the iProc
> +    I2C controller registers
> +
> +- interrupts:
> +    Should contain the I2C interrupt
> +
> +- clock-frequency:
> +    This is the I2C bus clock. Need to be either 100000 or 400000
> +
> +- #address-cells:
> +    Always 1 (for I2C addresses)
> +
> +- #size-cells:
> +    Always 0
> +

All the properties defined with two lines of statements.

Why cant they be with single line statement, like:

compatible:	Must be "brcm,iproc-i2c"
reg:		Define the base and range of the I/O address space that
		contain the iProc I2C controller registers

....


-- 
Thanks and Regards,
Varka Bhadram.

[PATCH 1/4] i2c: iProc: define Broadcom iProc I2C binding

[Varka Bhadram]

Hi,

On Wednesday 10 December 2014 06:24 AM, Ray Jui wrote:
> Document the I2C device tree binding for Broadcom iProc family of
> SoCs
>
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> ---
>   .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++++++++++++++++++++
>   1 file changed, 37 insertions(+)
>   create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
>
> diff --git a/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
> new file mode 100644
> index 0000000..81f982c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
> @@ -0,0 +1,37 @@
> +Broadcom iProc I2C controller
> +
> +Required properties:
> +
> +- compatible:
> +    Must be "brcm,iproc-i2c"
> +
> +- reg:
> +    Define the base and range of the I/O address space that contain the iProc
> +    I2C controller registers
> +
> +- interrupts:
> +    Should contain the I2C interrupt
> +
> +- clock-frequency:
> +    This is the I2C bus clock. Need to be either 100000 or 400000
> +
> +- #address-cells:
> +    Always 1 (for I2C addresses)
> +
> +- #size-cells:
> +    Always 0
> +

All the properties defined with two lines of statements.

Why cant they be with single line statement, like:

compatible:	Must be "brcm,iproc-i2c"
reg:		Define the base and range of the I/O address space that
		contain the iProc I2C controller registers

....


-- 
Thanks and Regards,
Varka Bhadram.

Re: [PATCH 2/4] i2c: iproc: Add Broadcom iProc I2C Driver

[Varka Bhadram]

On Wednesday 10 December 2014 06:24 AM, Ray Jui wrote:
> Add initial support to the Broadcom iProc I2C controller found in the
> iProc family of SoCs.
>
> The iProc I2C controller has separate internal TX and RX FIFOs, each has
> a size of 64 bytes. The iProc I2C controller supports two bus speeds
> including standard mode (100kHz) and fast mode (400kHz)
>
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> ---
>   drivers/i2c/busses/Kconfig         |    9 +
>   drivers/i2c/busses/Makefile        |    1 +
>   drivers/i2c/busses/i2c-bcm-iproc.c |  503 ++++++++++++++++++++++++++++++++++++
>   3 files changed, 513 insertions(+)
>   create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c
>
> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
> index c1351d9..8a2eb7e 100644
> --- a/drivers/i2c/busses/Kconfig
> +++ b/drivers/i2c/busses/Kconfig
> @@ -372,6 +372,15 @@ config I2C_BCM2835
>   	  This support is also available as a module.  If so, the module
>   	  will be called i2c-bcm2835.
>   
> +config I2C_BCM_IPROC
> +	tristate "Broadcom iProc I2C controller"
> +	depends on ARCH_BCM_IPROC
> +	help
> +	  If you say yes to this option, support will be included for the
> +	  Broadcom iProc I2C controller.
> +
> +	  If you don't know what to do here, say N.
> +
>   config I2C_BCM_KONA
>   	tristate "BCM Kona I2C adapter"
>   	depends on ARCH_BCM_MOBILE
> diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
> index 5e6c822..216e7be 100644
> --- a/drivers/i2c/busses/Makefile
> +++ b/drivers/i2c/busses/Makefile
> @@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
>   obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
>   obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
>   obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
> +obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
>   obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
>   obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
>   obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
> diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
> new file mode 100644
> index 0000000..0e6e603
> --- /dev/null
> +++ b/drivers/i2c/busses/i2c-bcm-iproc.c
> @@ -0,0 +1,503 @@
> +/*
> + * Copyright (C) 2014 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/device.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/sched.h>
> +#include <linux/i2c.h>
> +#include <linux/interrupt.h>
> +#include <linux/platform_device.h>
> +#include <linux/clk.h>
> +#include <linux/io.h>
> +#include <linux/slab.h>
> +#include <linux/delay.h>
> +
> +#define CFG_OFFSET                   0x00
> +#define CFG_RESET_SHIFT              31
> +#define CFG_EN_SHIFT                 30
> +#define CFG_M_RETRY_CNT_SHIFT        16
> +#define CFG_M_RETRY_CNT_MASK         0x0f
> +
> +#define TIM_CFG_OFFSET               0x04
> +#define TIME_CFG_MODE_400_SHIFT      31
> +
> +#define M_FIFO_CTRL_OFFSET           0x0c
> +#define M_FIFO_RX_FLUSH_SHIFT        31
> +#define M_FIFO_TX_FLUSH_SHIFT        30
> +#define M_FIFO_RX_CNT_SHIFT          16
> +#define M_FIFO_RX_CNT_MASK           0x7f
> +#define M_FIFO_RX_THLD_SHIFT         8
> +#define M_FIFO_RX_THLD_MASK          0x3f
> +
> +#define M_CMD_OFFSET                 0x30
> +#define M_CMD_START_BUSY_SHIFT       31
> +#define M_CMD_STATUS_SHIFT           25
> +#define M_CMD_STATUS_MASK            0x07
> +#define M_CMD_STATUS_SUCCESS         0x0
> +#define M_CMD_STATUS_LOST_ARB        0x1
> +#define M_CMD_STATUS_NACK_ADDR       0x2
> +#define M_CMD_STATUS_NACK_DATA       0x3
> +#define M_CMD_STATUS_TIMEOUT         0x4
> +#define M_CMD_PROTOCOL_SHIFT         9
> +#define M_CMD_PROTOCOL_MASK          0xf
> +#define M_CMD_PROTOCOL_BLK_WR        0x7
> +#define M_CMD_PROTOCOL_BLK_RD        0x8
> +#define M_CMD_PEC_SHIFT              8
> +#define M_CMD_RD_CNT_SHIFT           0
> +#define M_CMD_RD_CNT_MASK            0xff
> +
> +#define IE_OFFSET                    0x38
> +#define IE_M_RX_FIFO_FULL_SHIFT      31
> +#define IE_M_RX_THLD_SHIFT           30
> +#define IE_M_START_BUSY_SHIFT        28
> +
> +#define IS_OFFSET                    0x3c
> +#define IS_M_RX_FIFO_FULL_SHIFT      31
> +#define IS_M_RX_THLD_SHIFT           30
> +#define IS_M_START_BUSY_SHIFT        28
> +
> +#define M_TX_OFFSET                  0x40
> +#define M_TX_WR_STATUS_SHIFT         31
> +#define M_TX_DATA_SHIFT              0
> +#define M_TX_DATA_MASK               0xff
> +
> +#define M_RX_OFFSET                  0x44
> +#define M_RX_STATUS_SHIFT            30
> +#define M_RX_STATUS_MASK             0x03
> +#define M_RX_PEC_ERR_SHIFT           29
> +#define M_RX_DATA_SHIFT              0
> +#define M_RX_DATA_MASK               0xff
> +
> +#define I2C_TIMEOUT_MESC             100
> +#define M_TX_RX_FIFO_SIZE            64
> +
> +enum bus_speed_index {
> +	I2C_SPD_100K = 0,
> +	I2C_SPD_400K,
> +};
> +
> +struct bcm_iproc_i2c_dev {
> +	struct device *device;
> +
> +	void __iomem *base;
> +	struct i2c_msg *msg;
> +
> +	struct i2c_adapter adapter;
> +
> +	struct completion done;
> +};
> +
> +/*
> + * Can be expanded in the future if more interrupt status bits are utilized
> + */
> +#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
> +
> +static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
> +{
> +	struct bcm_iproc_i2c_dev *dev = data;
> +	u32 status = readl(dev->base + IS_OFFSET);
> +
> +	status &= ISR_MASK;
> +
> +	if (!status)
> +		return IRQ_NONE;
> +
> +	writel(status, dev->base + IS_OFFSET);
> +	complete_all(&dev->done);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static int __wait_for_bus_idle(struct bcm_iproc_i2c_dev *dev)
> +{
> +	unsigned long timeout = jiffies + msecs_to_jiffies(I2C_TIMEOUT_MESC);
> +
> +	while (readl(dev->base + M_CMD_OFFSET) &
> +			(1 << M_CMD_START_BUSY_SHIFT)) {
> +		if (time_after(jiffies, timeout)) {
> +			dev_err(dev->device, "wait for bus idle timeout\n");
> +			return -ETIMEDOUT;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *dev,
> +		struct i2c_msg *msg, u8 *addr)
> +{

Match open parenthesis..

static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *dev,
				     struct i2c_msg *msg, u8 *addr)


> +
> +	if (msg->flags & I2C_M_TEN) {
> +		dev_err(dev->device, "no support for 10-bit address\n");
> +		return -EINVAL;
> +	}
> +
> +	*addr = (msg->addr << 1) & 0xfe;
> +
> +	if (msg->flags & I2C_M_RD)
> +		*addr |= 1;
> +
> +	return 0;
> +}
> +
> +static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *dev)
> +{
> +	u32 val;
> +
> +	val = readl(dev->base + M_CMD_OFFSET);
> +	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
> +
> +	switch (val) {
> +	case M_CMD_STATUS_SUCCESS:
> +		return 0;
> +
> +	case M_CMD_STATUS_LOST_ARB:
> +		dev_err(dev->device, "lost bus arbitration\n");
> +		return -EREMOTEIO;
> +
> +	case M_CMD_STATUS_NACK_ADDR:
> +		dev_err(dev->device, "NAK addr:0x%02x\n", dev->msg->addr);
> +		return -EREMOTEIO;
> +
> +	case M_CMD_STATUS_NACK_DATA:
> +		dev_err(dev->device, "NAK data\n");
> +		return -EREMOTEIO;
> +
> +	case M_CMD_STATUS_TIMEOUT:
> +		dev_err(dev->device, "bus timeout\n");
> +		return -ETIMEDOUT;
> +
> +	default:
> +		dev_err(dev->device, "unknown error code=%d\n", val);
> +		return -EREMOTEIO;
> +	}
> +
> +	return -EREMOTEIO;
> +}
> +
> +static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *dev,
> +		struct i2c_msg *msg)
> +{

dto...

> +	int ret, i;
> +	u8 addr;
> +	u32 val;
> +	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
> +
> +	if (msg->len < 1 || msg->len > M_TX_RX_FIFO_SIZE - 1) {
> +		dev_err(dev->device,
> +			"supported data length is 1 - %u bytes\n",
> +				M_TX_RX_FIFO_SIZE - 1);
> +		return -EINVAL;
> +	}
> +
> +	dev->msg = msg;
> +	ret = __wait_for_bus_idle(dev);
> +	if (ret)
> +		return ret;
> +
> +	ret = bcm_iproc_i2c_format_addr(dev, msg, &addr);
> +	if (ret)
> +		return ret;
> +
> +	/* load slave address into the TX FIFO */
> +	writel(addr, dev->base + M_TX_OFFSET);
> +
> +	/* for a write transaction, load data into the TX FIFO */
> +	if (!(msg->flags & I2C_M_RD)) {
> +		for (i = 0; i < msg->len; i++) {
> +			val = msg->buf[i];
> +
> +			/* mark the last byte */
> +			if (i == msg->len - 1)
> +				val |= 1 << M_TX_WR_STATUS_SHIFT;
> +
> +			writel(val, dev->base + M_TX_OFFSET);
> +		}
> +	}
> +
> +	/* mark as incomplete before starting the transaction */
> +	reinit_completion(&dev->done);
> +
> +	/*
> +	 * Enable the "start busy" interrupt, which will be triggered after
> +	 * the transaction is done
> +	 */
> +	writel(1 << IE_M_START_BUSY_SHIFT, dev->base + IE_OFFSET);
> +
> +	/*
> +	 * Now we can activate the transfer. For a read operation, specify the
> +	 * number of bytes to read
> +	 */
> +	val = 1 << M_CMD_START_BUSY_SHIFT;
> +	if (msg->flags & I2C_M_RD) {
> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
> +			(msg->len << M_CMD_RD_CNT_SHIFT);
> +	} else {
> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
> +	}
> +	writel(val, dev->base + M_CMD_OFFSET);
> +
> +	time_left = wait_for_completion_timeout(&dev->done, time_left);
> +
> +	/* disable all interrupts */
> +	writel(0, dev->base + IE_OFFSET);
> +
> +	if (!time_left) {
> +		dev_err(dev->device, "transaction times out\n");
> +
> +		/* flush FIFOs */
> +		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
> +			(1 << M_FIFO_TX_FLUSH_SHIFT);
> +		writel(val, dev->base + M_FIFO_CTRL_OFFSET);
> +		return -EREMOTEIO;
> +	}
> +
> +	ret = bcm_iproc_i2c_check_status(dev);
> +	if (ret) {
> +		/* flush both TX/RX FIFOs */
> +		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
> +			(1 << M_FIFO_TX_FLUSH_SHIFT);
> +		writel(val, dev->base + M_FIFO_CTRL_OFFSET);
> +		return ret;
> +	}
> +
> +	/*
> +	 * For a read operation, we now need to load the data from FIFO
> +	 * into the memory buffer
> +	 */
> +	if (msg->flags & I2C_M_RD) {
> +		for (i = 0; i < msg->len; i++) {
> +			msg->buf[i] = (readl(dev->base + M_RX_OFFSET) >>
> +					M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
> +		}
> +	}
> +
> +	dev_dbg(dev->device, "xfer %c, addr=0x%02x, len=%d\n",
> +			(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
> +			msg->len);
> +	dev_dbg(dev->device, "**** data start ****\n");
> +	for (i = 0; i < msg->len; i++)
> +		dev_dbg(dev->device, "0x%02x ",  msg->buf[i]);
> +	dev_dbg(dev->device, "**** data end ****\n");
> +
> +	return 0;
> +}
> +
> +static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
> +			     struct i2c_msg msgs[], int num)
> +{
> +	struct bcm_iproc_i2c_dev *dev = i2c_get_adapdata(adapter);
> +	int ret, i;
> +
> +	/* go through all messages */
> +	for (i = 0; i < num; i++) {
> +		ret = bcm_iproc_i2c_xfer_single_msg(dev, &msgs[i]);
> +		if (ret) {
> +			dev_err(dev->device, "xfer failed\n");
> +			return ret;
> +		}
> +	}
> +
> +	return num;
> +}
> +
> +static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
> +{
> +	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
> +}
> +
> +static const struct i2c_algorithm bcm_iproc_algo = {
> +	.master_xfer = bcm_iproc_i2c_xfer,
> +	.functionality = bcm_iproc_i2c_functionality,
> +};
> +
> +static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *dev)
> +{
> +	unsigned int bus_speed, speed_bit;
> +	u32 val;
> +	int ret = of_property_read_u32(dev->device->of_node, "clock-frequency",
> +				       &bus_speed);
> +	if (ret < 0) {
> +		dev_err(dev->device, "missing clock-frequency property\n");
> +		return -ENODEV;
> +	}
> +
> +	switch (bus_speed) {
> +	case 100000:
> +		speed_bit = 0;
> +		break;
> +	case 400000:
> +		speed_bit = 1;
> +		break;
> +	default:
> +		dev_err(dev->device, "%d Hz bus speed not supported\n",
> +				bus_speed);
> +		dev_err(dev->device, "valid speeds are 100khz and 400khz\n");
> +		return -EINVAL;
> +	}
> +
> +	val = readl(dev->base + TIM_CFG_OFFSET);
> +	val &= ~(1 << TIME_CFG_MODE_400_SHIFT);
> +	val |= speed_bit << TIME_CFG_MODE_400_SHIFT;
> +	writel(val, dev->base + TIM_CFG_OFFSET);
> +
> +	dev_info(dev->device, "bus set to %u Hz\n", bus_speed);
> +
> +	return 0;
> +}
> +
> +static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *dev)
> +{
> +	u32 val;
> +
> +	/* put controller in reset */
> +	val = readl(dev->base + CFG_OFFSET);
> +	val |= 1 << CFG_RESET_SHIFT;
> +	val &= ~(1 << CFG_EN_SHIFT);
> +	writel(val, dev->base + CFG_OFFSET);
> +
> +	/* wait 100 usec per spec */
> +	udelay(100);
> +
> +	/* bring controller out of reset */
> +	val = readl(dev->base + CFG_OFFSET);
> +	val &= ~(1 << CFG_RESET_SHIFT);
> +	writel(val, dev->base + CFG_OFFSET);
> +
> +	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
> +	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
> +	writel(val, dev->base + M_FIFO_CTRL_OFFSET);
> +
> +	/* disable all interrupts */
> +	val = 0;
> +	writel(val, dev->base + IE_OFFSET);
> +
> +	/* clear all pending interrupts */
> +	val = readl(dev->base + IS_OFFSET);
> +	writel(val, dev->base + IS_OFFSET);
> +
> +	return 0;
> +}
> +
> +static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *dev)
> +{
> +	u32 val;
> +
> +	val = readl(dev->base + CFG_OFFSET);
> +	val |= 1 << CFG_EN_SHIFT;
> +	writel(val, dev->base + CFG_OFFSET);
> +}
> +
> +static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *dev)
> +{
> +	u32 val;
> +
> +	val = readl(dev->base + CFG_OFFSET);
> +	val &= ~(1 << CFG_EN_SHIFT);
> +	writel(val, dev->base + CFG_OFFSET);
> +}
> +
> +static int bcm_iproc_i2c_probe(struct platform_device *pdev)
> +{
> +	int irq, ret = 0;
> +	struct bcm_iproc_i2c_dev *dev;
> +	struct i2c_adapter *adap;
> +	struct resource *res;
> +
> +	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
> +	if (!dev)
> +		return -ENOMEM;
> +
> +	platform_set_drvdata(pdev, dev);
> +	dev->device = &pdev->dev;
> +	init_completion(&dev->done);
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	if (!res)
> +		return -ENODEV;

We can remove this resource check. This checking will happen with devm_ioremap_resource()

> +	dev->base = devm_ioremap_resource(dev->device, res);
> +	if (IS_ERR(dev->base))
> +		return -ENOMEM;
> +
> +	ret = bcm_iproc_i2c_init(dev);
> +	if (ret)
> +		return ret;
> +
> +	ret = bcm_iproc_i2c_cfg_speed(dev);
> +	if (ret)
> +		return ret;
> +
> +	irq = platform_get_irq(pdev, 0);
> +	if (irq < 0) {
> +		dev_err(dev->device, "no irq resource\n");
> +		return irq;
> +	}
> +
> +	ret = devm_request_irq(&pdev->dev, irq, bcm_iproc_i2c_isr,
> +			IRQF_SHARED, pdev->name, dev);
> +	if (ret) {
> +		dev_err(dev->device, "unable to request irq %i\n", irq);
> +		return ret;
> +	}
> +
> +	bcm_iproc_i2c_enable(dev);
> +
> +	adap = &dev->adapter;
> +	i2c_set_adapdata(adap, dev);
> +	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
> +	adap->algo = &bcm_iproc_algo;
> +	adap->dev.parent = &pdev->dev;
> +	adap->dev.of_node = pdev->dev.of_node;
> +
> +	ret = i2c_add_adapter(adap);
> +	if (ret) {
> +		dev_err(dev->device, "failed to add adapter\n");
> +		return ret;
> +	}
> +
> +	dev_info(dev->device, "device registered successfully\n");
> +
> +	return 0;
> +}
> +
> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
> +{
> +	struct bcm_iproc_i2c_dev *dev = platform_get_drvdata(pdev);
> +
> +	i2c_del_adapter(&dev->adapter);
> +	bcm_iproc_i2c_disable(dev);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id bcm_iproc_i2c_of_match[] = {
> +	{.compatible = "brcm,iproc-i2c",},
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
> +
> +static struct platform_driver bcm_iproc_i2c_driver = {
> +	.driver = {
> +		   .name = "bcm-iproc-i2c",
> +		   .owner = THIS_MODULE,

No need to update this field. Its updated by module_platform_driver().

> +		   .of_match_table = bcm_iproc_i2c_of_match,
> +		   },
> +	.probe = bcm_iproc_i2c_probe,
> +	.remove = bcm_iproc_i2c_remove,
> +};
> +module_platform_driver(bcm_iproc_i2c_driver);
> +
> +MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
> +MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
> +MODULE_LICENSE("GPL v2");

-- 
Thanks and Regards,
Varka Bhadram.

[PATCH 2/4] i2c: iproc: Add Broadcom iProc I2C Driver

[Varka Bhadram]

On Wednesday 10 December 2014 06:24 AM, Ray Jui wrote:
> Add initial support to the Broadcom iProc I2C controller found in the
> iProc family of SoCs.
>
> The iProc I2C controller has separate internal TX and RX FIFOs, each has
> a size of 64 bytes. The iProc I2C controller supports two bus speeds
> including standard mode (100kHz) and fast mode (400kHz)
>
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> ---
>   drivers/i2c/busses/Kconfig         |    9 +
>   drivers/i2c/busses/Makefile        |    1 +
>   drivers/i2c/busses/i2c-bcm-iproc.c |  503 ++++++++++++++++++++++++++++++++++++
>   3 files changed, 513 insertions(+)
>   create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c
>
> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
> index c1351d9..8a2eb7e 100644
> --- a/drivers/i2c/busses/Kconfig
> +++ b/drivers/i2c/busses/Kconfig
> @@ -372,6 +372,15 @@ config I2C_BCM2835
>   	  This support is also available as a module.  If so, the module
>   	  will be called i2c-bcm2835.
>   
> +config I2C_BCM_IPROC
> +	tristate "Broadcom iProc I2C controller"
> +	depends on ARCH_BCM_IPROC
> +	help
> +	  If you say yes to this option, support will be included for the
> +	  Broadcom iProc I2C controller.
> +
> +	  If you don't know what to do here, say N.
> +
>   config I2C_BCM_KONA
>   	tristate "BCM Kona I2C adapter"
>   	depends on ARCH_BCM_MOBILE
> diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
> index 5e6c822..216e7be 100644
> --- a/drivers/i2c/busses/Makefile
> +++ b/drivers/i2c/busses/Makefile
> @@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
>   obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
>   obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
>   obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
> +obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
>   obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
>   obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
>   obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
> diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
> new file mode 100644
> index 0000000..0e6e603
> --- /dev/null
> +++ b/drivers/i2c/busses/i2c-bcm-iproc.c
> @@ -0,0 +1,503 @@
> +/*
> + * Copyright (C) 2014 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/device.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/sched.h>
> +#include <linux/i2c.h>
> +#include <linux/interrupt.h>
> +#include <linux/platform_device.h>
> +#include <linux/clk.h>
> +#include <linux/io.h>
> +#include <linux/slab.h>
> +#include <linux/delay.h>
> +
> +#define CFG_OFFSET                   0x00
> +#define CFG_RESET_SHIFT              31
> +#define CFG_EN_SHIFT                 30
> +#define CFG_M_RETRY_CNT_SHIFT        16
> +#define CFG_M_RETRY_CNT_MASK         0x0f
> +
> +#define TIM_CFG_OFFSET               0x04
> +#define TIME_CFG_MODE_400_SHIFT      31
> +
> +#define M_FIFO_CTRL_OFFSET           0x0c
> +#define M_FIFO_RX_FLUSH_SHIFT        31
> +#define M_FIFO_TX_FLUSH_SHIFT        30
> +#define M_FIFO_RX_CNT_SHIFT          16
> +#define M_FIFO_RX_CNT_MASK           0x7f
> +#define M_FIFO_RX_THLD_SHIFT         8
> +#define M_FIFO_RX_THLD_MASK          0x3f
> +
> +#define M_CMD_OFFSET                 0x30
> +#define M_CMD_START_BUSY_SHIFT       31
> +#define M_CMD_STATUS_SHIFT           25
> +#define M_CMD_STATUS_MASK            0x07
> +#define M_CMD_STATUS_SUCCESS         0x0
> +#define M_CMD_STATUS_LOST_ARB        0x1
> +#define M_CMD_STATUS_NACK_ADDR       0x2
> +#define M_CMD_STATUS_NACK_DATA       0x3
> +#define M_CMD_STATUS_TIMEOUT         0x4
> +#define M_CMD_PROTOCOL_SHIFT         9
> +#define M_CMD_PROTOCOL_MASK          0xf
> +#define M_CMD_PROTOCOL_BLK_WR        0x7
> +#define M_CMD_PROTOCOL_BLK_RD        0x8
> +#define M_CMD_PEC_SHIFT              8
> +#define M_CMD_RD_CNT_SHIFT           0
> +#define M_CMD_RD_CNT_MASK            0xff
> +
> +#define IE_OFFSET                    0x38
> +#define IE_M_RX_FIFO_FULL_SHIFT      31
> +#define IE_M_RX_THLD_SHIFT           30
> +#define IE_M_START_BUSY_SHIFT        28
> +
> +#define IS_OFFSET                    0x3c
> +#define IS_M_RX_FIFO_FULL_SHIFT      31
> +#define IS_M_RX_THLD_SHIFT           30
> +#define IS_M_START_BUSY_SHIFT        28
> +
> +#define M_TX_OFFSET                  0x40
> +#define M_TX_WR_STATUS_SHIFT         31
> +#define M_TX_DATA_SHIFT              0
> +#define M_TX_DATA_MASK               0xff
> +
> +#define M_RX_OFFSET                  0x44
> +#define M_RX_STATUS_SHIFT            30
> +#define M_RX_STATUS_MASK             0x03
> +#define M_RX_PEC_ERR_SHIFT           29
> +#define M_RX_DATA_SHIFT              0
> +#define M_RX_DATA_MASK               0xff
> +
> +#define I2C_TIMEOUT_MESC             100
> +#define M_TX_RX_FIFO_SIZE            64
> +
> +enum bus_speed_index {
> +	I2C_SPD_100K = 0,
> +	I2C_SPD_400K,
> +};
> +
> +struct bcm_iproc_i2c_dev {
> +	struct device *device;
> +
> +	void __iomem *base;
> +	struct i2c_msg *msg;
> +
> +	struct i2c_adapter adapter;
> +
> +	struct completion done;
> +};
> +
> +/*
> + * Can be expanded in the future if more interrupt status bits are utilized
> + */
> +#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
> +
> +static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
> +{
> +	struct bcm_iproc_i2c_dev *dev = data;
> +	u32 status = readl(dev->base + IS_OFFSET);
> +
> +	status &= ISR_MASK;
> +
> +	if (!status)
> +		return IRQ_NONE;
> +
> +	writel(status, dev->base + IS_OFFSET);
> +	complete_all(&dev->done);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static int __wait_for_bus_idle(struct bcm_iproc_i2c_dev *dev)
> +{
> +	unsigned long timeout = jiffies + msecs_to_jiffies(I2C_TIMEOUT_MESC);
> +
> +	while (readl(dev->base + M_CMD_OFFSET) &
> +			(1 << M_CMD_START_BUSY_SHIFT)) {
> +		if (time_after(jiffies, timeout)) {
> +			dev_err(dev->device, "wait for bus idle timeout\n");
> +			return -ETIMEDOUT;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *dev,
> +		struct i2c_msg *msg, u8 *addr)
> +{

Match open parenthesis..

static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *dev,
				     struct i2c_msg *msg, u8 *addr)


> +
> +	if (msg->flags & I2C_M_TEN) {
> +		dev_err(dev->device, "no support for 10-bit address\n");
> +		return -EINVAL;
> +	}
> +
> +	*addr = (msg->addr << 1) & 0xfe;
> +
> +	if (msg->flags & I2C_M_RD)
> +		*addr |= 1;
> +
> +	return 0;
> +}
> +
> +static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *dev)
> +{
> +	u32 val;
> +
> +	val = readl(dev->base + M_CMD_OFFSET);
> +	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
> +
> +	switch (val) {
> +	case M_CMD_STATUS_SUCCESS:
> +		return 0;
> +
> +	case M_CMD_STATUS_LOST_ARB:
> +		dev_err(dev->device, "lost bus arbitration\n");
> +		return -EREMOTEIO;
> +
> +	case M_CMD_STATUS_NACK_ADDR:
> +		dev_err(dev->device, "NAK addr:0x%02x\n", dev->msg->addr);
> +		return -EREMOTEIO;
> +
> +	case M_CMD_STATUS_NACK_DATA:
> +		dev_err(dev->device, "NAK data\n");
> +		return -EREMOTEIO;
> +
> +	case M_CMD_STATUS_TIMEOUT:
> +		dev_err(dev->device, "bus timeout\n");
> +		return -ETIMEDOUT;
> +
> +	default:
> +		dev_err(dev->device, "unknown error code=%d\n", val);
> +		return -EREMOTEIO;
> +	}
> +
> +	return -EREMOTEIO;
> +}
> +
> +static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *dev,
> +		struct i2c_msg *msg)
> +{

dto...

> +	int ret, i;
> +	u8 addr;
> +	u32 val;
> +	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
> +
> +	if (msg->len < 1 || msg->len > M_TX_RX_FIFO_SIZE - 1) {
> +		dev_err(dev->device,
> +			"supported data length is 1 - %u bytes\n",
> +				M_TX_RX_FIFO_SIZE - 1);
> +		return -EINVAL;
> +	}
> +
> +	dev->msg = msg;
> +	ret = __wait_for_bus_idle(dev);
> +	if (ret)
> +		return ret;
> +
> +	ret = bcm_iproc_i2c_format_addr(dev, msg, &addr);
> +	if (ret)
> +		return ret;
> +
> +	/* load slave address into the TX FIFO */
> +	writel(addr, dev->base + M_TX_OFFSET);
> +
> +	/* for a write transaction, load data into the TX FIFO */
> +	if (!(msg->flags & I2C_M_RD)) {
> +		for (i = 0; i < msg->len; i++) {
> +			val = msg->buf[i];
> +
> +			/* mark the last byte */
> +			if (i == msg->len - 1)
> +				val |= 1 << M_TX_WR_STATUS_SHIFT;
> +
> +			writel(val, dev->base + M_TX_OFFSET);
> +		}
> +	}
> +
> +	/* mark as incomplete before starting the transaction */
> +	reinit_completion(&dev->done);
> +
> +	/*
> +	 * Enable the "start busy" interrupt, which will be triggered after
> +	 * the transaction is done
> +	 */
> +	writel(1 << IE_M_START_BUSY_SHIFT, dev->base + IE_OFFSET);
> +
> +	/*
> +	 * Now we can activate the transfer. For a read operation, specify the
> +	 * number of bytes to read
> +	 */
> +	val = 1 << M_CMD_START_BUSY_SHIFT;
> +	if (msg->flags & I2C_M_RD) {
> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
> +			(msg->len << M_CMD_RD_CNT_SHIFT);
> +	} else {
> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
> +	}
> +	writel(val, dev->base + M_CMD_OFFSET);
> +
> +	time_left = wait_for_completion_timeout(&dev->done, time_left);
> +
> +	/* disable all interrupts */
> +	writel(0, dev->base + IE_OFFSET);
> +
> +	if (!time_left) {
> +		dev_err(dev->device, "transaction times out\n");
> +
> +		/* flush FIFOs */
> +		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
> +			(1 << M_FIFO_TX_FLUSH_SHIFT);
> +		writel(val, dev->base + M_FIFO_CTRL_OFFSET);
> +		return -EREMOTEIO;
> +	}
> +
> +	ret = bcm_iproc_i2c_check_status(dev);
> +	if (ret) {
> +		/* flush both TX/RX FIFOs */
> +		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
> +			(1 << M_FIFO_TX_FLUSH_SHIFT);
> +		writel(val, dev->base + M_FIFO_CTRL_OFFSET);
> +		return ret;
> +	}
> +
> +	/*
> +	 * For a read operation, we now need to load the data from FIFO
> +	 * into the memory buffer
> +	 */
> +	if (msg->flags & I2C_M_RD) {
> +		for (i = 0; i < msg->len; i++) {
> +			msg->buf[i] = (readl(dev->base + M_RX_OFFSET) >>
> +					M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
> +		}
> +	}
> +
> +	dev_dbg(dev->device, "xfer %c, addr=0x%02x, len=%d\n",
> +			(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
> +			msg->len);
> +	dev_dbg(dev->device, "**** data start ****\n");
> +	for (i = 0; i < msg->len; i++)
> +		dev_dbg(dev->device, "0x%02x ",  msg->buf[i]);
> +	dev_dbg(dev->device, "**** data end ****\n");
> +
> +	return 0;
> +}
> +
> +static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
> +			     struct i2c_msg msgs[], int num)
> +{
> +	struct bcm_iproc_i2c_dev *dev = i2c_get_adapdata(adapter);
> +	int ret, i;
> +
> +	/* go through all messages */
> +	for (i = 0; i < num; i++) {
> +		ret = bcm_iproc_i2c_xfer_single_msg(dev, &msgs[i]);
> +		if (ret) {
> +			dev_err(dev->device, "xfer failed\n");
> +			return ret;
> +		}
> +	}
> +
> +	return num;
> +}
> +
> +static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
> +{
> +	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
> +}
> +
> +static const struct i2c_algorithm bcm_iproc_algo = {
> +	.master_xfer = bcm_iproc_i2c_xfer,
> +	.functionality = bcm_iproc_i2c_functionality,
> +};
> +
> +static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *dev)
> +{
> +	unsigned int bus_speed, speed_bit;
> +	u32 val;
> +	int ret = of_property_read_u32(dev->device->of_node, "clock-frequency",
> +				       &bus_speed);
> +	if (ret < 0) {
> +		dev_err(dev->device, "missing clock-frequency property\n");
> +		return -ENODEV;
> +	}
> +
> +	switch (bus_speed) {
> +	case 100000:
> +		speed_bit = 0;
> +		break;
> +	case 400000:
> +		speed_bit = 1;
> +		break;
> +	default:
> +		dev_err(dev->device, "%d Hz bus speed not supported\n",
> +				bus_speed);
> +		dev_err(dev->device, "valid speeds are 100khz and 400khz\n");
> +		return -EINVAL;
> +	}
> +
> +	val = readl(dev->base + TIM_CFG_OFFSET);
> +	val &= ~(1 << TIME_CFG_MODE_400_SHIFT);
> +	val |= speed_bit << TIME_CFG_MODE_400_SHIFT;
> +	writel(val, dev->base + TIM_CFG_OFFSET);
> +
> +	dev_info(dev->device, "bus set to %u Hz\n", bus_speed);
> +
> +	return 0;
> +}
> +
> +static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *dev)
> +{
> +	u32 val;
> +
> +	/* put controller in reset */
> +	val = readl(dev->base + CFG_OFFSET);
> +	val |= 1 << CFG_RESET_SHIFT;
> +	val &= ~(1 << CFG_EN_SHIFT);
> +	writel(val, dev->base + CFG_OFFSET);
> +
> +	/* wait 100 usec per spec */
> +	udelay(100);
> +
> +	/* bring controller out of reset */
> +	val = readl(dev->base + CFG_OFFSET);
> +	val &= ~(1 << CFG_RESET_SHIFT);
> +	writel(val, dev->base + CFG_OFFSET);
> +
> +	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
> +	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
> +	writel(val, dev->base + M_FIFO_CTRL_OFFSET);
> +
> +	/* disable all interrupts */
> +	val = 0;
> +	writel(val, dev->base + IE_OFFSET);
> +
> +	/* clear all pending interrupts */
> +	val = readl(dev->base + IS_OFFSET);
> +	writel(val, dev->base + IS_OFFSET);
> +
> +	return 0;
> +}
> +
> +static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *dev)
> +{
> +	u32 val;
> +
> +	val = readl(dev->base + CFG_OFFSET);
> +	val |= 1 << CFG_EN_SHIFT;
> +	writel(val, dev->base + CFG_OFFSET);
> +}
> +
> +static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *dev)
> +{
> +	u32 val;
> +
> +	val = readl(dev->base + CFG_OFFSET);
> +	val &= ~(1 << CFG_EN_SHIFT);
> +	writel(val, dev->base + CFG_OFFSET);
> +}
> +
> +static int bcm_iproc_i2c_probe(struct platform_device *pdev)
> +{
> +	int irq, ret = 0;
> +	struct bcm_iproc_i2c_dev *dev;
> +	struct i2c_adapter *adap;
> +	struct resource *res;
> +
> +	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
> +	if (!dev)
> +		return -ENOMEM;
> +
> +	platform_set_drvdata(pdev, dev);
> +	dev->device = &pdev->dev;
> +	init_completion(&dev->done);
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	if (!res)
> +		return -ENODEV;

We can remove this resource check. This checking will happen with devm_ioremap_resource()

> +	dev->base = devm_ioremap_resource(dev->device, res);
> +	if (IS_ERR(dev->base))
> +		return -ENOMEM;
> +
> +	ret = bcm_iproc_i2c_init(dev);
> +	if (ret)
> +		return ret;
> +
> +	ret = bcm_iproc_i2c_cfg_speed(dev);
> +	if (ret)
> +		return ret;
> +
> +	irq = platform_get_irq(pdev, 0);
> +	if (irq < 0) {
> +		dev_err(dev->device, "no irq resource\n");
> +		return irq;
> +	}
> +
> +	ret = devm_request_irq(&pdev->dev, irq, bcm_iproc_i2c_isr,
> +			IRQF_SHARED, pdev->name, dev);
> +	if (ret) {
> +		dev_err(dev->device, "unable to request irq %i\n", irq);
> +		return ret;
> +	}
> +
> +	bcm_iproc_i2c_enable(dev);
> +
> +	adap = &dev->adapter;
> +	i2c_set_adapdata(adap, dev);
> +	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
> +	adap->algo = &bcm_iproc_algo;
> +	adap->dev.parent = &pdev->dev;
> +	adap->dev.of_node = pdev->dev.of_node;
> +
> +	ret = i2c_add_adapter(adap);
> +	if (ret) {
> +		dev_err(dev->device, "failed to add adapter\n");
> +		return ret;
> +	}
> +
> +	dev_info(dev->device, "device registered successfully\n");
> +
> +	return 0;
> +}
> +
> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
> +{
> +	struct bcm_iproc_i2c_dev *dev = platform_get_drvdata(pdev);
> +
> +	i2c_del_adapter(&dev->adapter);
> +	bcm_iproc_i2c_disable(dev);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id bcm_iproc_i2c_of_match[] = {
> +	{.compatible = "brcm,iproc-i2c",},
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
> +
> +static struct platform_driver bcm_iproc_i2c_driver = {
> +	.driver = {
> +		   .name = "bcm-iproc-i2c",
> +		   .owner = THIS_MODULE,

No need to update this field. Its updated by module_platform_driver().

> +		   .of_match_table = bcm_iproc_i2c_of_match,
> +		   },
> +	.probe = bcm_iproc_i2c_probe,
> +	.remove = bcm_iproc_i2c_remove,
> +};
> +module_platform_driver(bcm_iproc_i2c_driver);
> +
> +MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
> +MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
> +MODULE_LICENSE("GPL v2");

-- 
Thanks and Regards,
Varka Bhadram.

Re: [PATCH 1/4] i2c: iProc: define Broadcom iProc I2C binding

[Ray Jui]

On 12/9/2014 5:27 PM, Varka Bhadram wrote:
> Hi,
>
> On Wednesday 10 December 2014 06:24 AM, Ray Jui wrote:
>> Document the I2C device tree binding for Broadcom iProc family of
>> SoCs
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>> ---
>>   .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37
>> ++++++++++++++++++++
>>   1 file changed, 37 insertions(+)
>>   create mode 100644
>> Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
>>
>> diff --git a/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
>> b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
>> new file mode 100644
>> index 0000000..81f982c
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
>> @@ -0,0 +1,37 @@
>> +Broadcom iProc I2C controller
>> +
>> +Required properties:
>> +
>> +- compatible:
>> +    Must be "brcm,iproc-i2c"
>> +
>> +- reg:
>> +    Define the base and range of the I/O address space that contain
>> the iProc
>> +    I2C controller registers
>> +
>> +- interrupts:
>> +    Should contain the I2C interrupt
>> +
>> +- clock-frequency:
>> +    This is the I2C bus clock. Need to be either 100000 or 400000
>> +
>> +- #address-cells:
>> +    Always 1 (for I2C addresses)
>> +
>> +- #size-cells:
>> +    Always 0
>> +
>
> All the properties defined with two lines of statements.
>
> Why cant they be with single line statement, like:
>
> compatible:    Must be "brcm,iproc-i2c"
> reg:        Define the base and range of the I/O address space that
>          contain the iProc I2C controller registers
>
> ....
>
>
I thought making them two lines are more readable (and obviously that's 
very subjective, :)). But more importantly, it matches the format of 
other Broadcom iProc/Cygnus devicetree binding documents that are 
currently in progress of upstreaming.

Re: [PATCH 1/4] i2c: iProc: define Broadcom iProc I2C binding

[Ray Jui]

On 12/9/2014 5:27 PM, Varka Bhadram wrote:
> Hi,
>
> On Wednesday 10 December 2014 06:24 AM, Ray Jui wrote:
>> Document the I2C device tree binding for Broadcom iProc family of
>> SoCs
>>
>> Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>> Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>> ---
>>   .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37
>> ++++++++++++++++++++
>>   1 file changed, 37 insertions(+)
>>   create mode 100644
>> Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
>>
>> diff --git a/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
>> b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
>> new file mode 100644
>> index 0000000..81f982c
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
>> @@ -0,0 +1,37 @@
>> +Broadcom iProc I2C controller
>> +
>> +Required properties:
>> +
>> +- compatible:
>> +    Must be "brcm,iproc-i2c"
>> +
>> +- reg:
>> +    Define the base and range of the I/O address space that contain
>> the iProc
>> +    I2C controller registers
>> +
>> +- interrupts:
>> +    Should contain the I2C interrupt
>> +
>> +- clock-frequency:
>> +    This is the I2C bus clock. Need to be either 100000 or 400000
>> +
>> +- #address-cells:
>> +    Always 1 (for I2C addresses)
>> +
>> +- #size-cells:
>> +    Always 0
>> +
>
> All the properties defined with two lines of statements.
>
> Why cant they be with single line statement, like:
>
> compatible:    Must be "brcm,iproc-i2c"
> reg:        Define the base and range of the I/O address space that
>          contain the iProc I2C controller registers
>
> ....
>
>
I thought making them two lines are more readable (and obviously that's 
very subjective, :)). But more importantly, it matches the format of 
other Broadcom iProc/Cygnus devicetree binding documents that are 
currently in progress of upstreaming.

[PATCH 1/4] i2c: iProc: define Broadcom iProc I2C binding

[Ray Jui]

On 12/9/2014 5:27 PM, Varka Bhadram wrote:
> Hi,
>
> On Wednesday 10 December 2014 06:24 AM, Ray Jui wrote:
>> Document the I2C device tree binding for Broadcom iProc family of
>> SoCs
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>> ---
>>   .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37
>> ++++++++++++++++++++
>>   1 file changed, 37 insertions(+)
>>   create mode 100644
>> Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
>>
>> diff --git a/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
>> b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
>> new file mode 100644
>> index 0000000..81f982c
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
>> @@ -0,0 +1,37 @@
>> +Broadcom iProc I2C controller
>> +
>> +Required properties:
>> +
>> +- compatible:
>> +    Must be "brcm,iproc-i2c"
>> +
>> +- reg:
>> +    Define the base and range of the I/O address space that contain
>> the iProc
>> +    I2C controller registers
>> +
>> +- interrupts:
>> +    Should contain the I2C interrupt
>> +
>> +- clock-frequency:
>> +    This is the I2C bus clock. Need to be either 100000 or 400000
>> +
>> +- #address-cells:
>> +    Always 1 (for I2C addresses)
>> +
>> +- #size-cells:
>> +    Always 0
>> +
>
> All the properties defined with two lines of statements.
>
> Why cant they be with single line statement, like:
>
> compatible:    Must be "brcm,iproc-i2c"
> reg:        Define the base and range of the I/O address space that
>          contain the iProc I2C controller registers
>
> ....
>
>
I thought making them two lines are more readable (and obviously that's 
very subjective, :)). But more importantly, it matches the format of 
other Broadcom iProc/Cygnus devicetree binding documents that are 
currently in progress of upstreaming.

Re: [PATCH 2/4] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 12/9/2014 5:33 PM, Varka Bhadram wrote:
>
> On Wednesday 10 December 2014 06:24 AM, Ray Jui wrote:
>> Add initial support to the Broadcom iProc I2C controller found in the
>> iProc family of SoCs.
>>
>> The iProc I2C controller has separate internal TX and RX FIFOs, each has
>> a size of 64 bytes. The iProc I2C controller supports two bus speeds
>> including standard mode (100kHz) and fast mode (400kHz)
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>> ---
>>   drivers/i2c/busses/Kconfig         |    9 +
>>   drivers/i2c/busses/Makefile        |    1 +
>>   drivers/i2c/busses/i2c-bcm-iproc.c |  503
>> ++++++++++++++++++++++++++++++++++++
>>   3 files changed, 513 insertions(+)
>>   create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c
>>
>> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
>> index c1351d9..8a2eb7e 100644
>> --- a/drivers/i2c/busses/Kconfig
>> +++ b/drivers/i2c/busses/Kconfig
>> @@ -372,6 +372,15 @@ config I2C_BCM2835
>>         This support is also available as a module.  If so, the module
>>         will be called i2c-bcm2835.
>> +config I2C_BCM_IPROC
>> +    tristate "Broadcom iProc I2C controller"
>> +    depends on ARCH_BCM_IPROC
>> +    help
>> +      If you say yes to this option, support will be included for the
>> +      Broadcom iProc I2C controller.
>> +
>> +      If you don't know what to do here, say N.
>> +
>>   config I2C_BCM_KONA
>>       tristate "BCM Kona I2C adapter"
>>       depends on ARCH_BCM_MOBILE
>> diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
>> index 5e6c822..216e7be 100644
>> --- a/drivers/i2c/busses/Makefile
>> +++ b/drivers/i2c/busses/Makefile
>> @@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)        += i2c-at91.o
>>   obj-$(CONFIG_I2C_AU1550)    += i2c-au1550.o
>>   obj-$(CONFIG_I2C_AXXIA)        += i2c-axxia.o
>>   obj-$(CONFIG_I2C_BCM2835)    += i2c-bcm2835.o
>> +obj-$(CONFIG_I2C_BCM_IPROC)    += i2c-bcm-iproc.o
>>   obj-$(CONFIG_I2C_BLACKFIN_TWI)    += i2c-bfin-twi.o
>>   obj-$(CONFIG_I2C_CADENCE)    += i2c-cadence.o
>>   obj-$(CONFIG_I2C_CBUS_GPIO)    += i2c-cbus-gpio.o
>> diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c
>> b/drivers/i2c/busses/i2c-bcm-iproc.c
>> new file mode 100644
>> index 0000000..0e6e603
>> --- /dev/null
>> +++ b/drivers/i2c/busses/i2c-bcm-iproc.c
>> @@ -0,0 +1,503 @@
>> +/*
>> + * Copyright (C) 2014 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#include <linux/device.h>
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/sched.h>
>> +#include <linux/i2c.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/clk.h>
>> +#include <linux/io.h>
>> +#include <linux/slab.h>
>> +#include <linux/delay.h>
>> +
>> +#define CFG_OFFSET                   0x00
>> +#define CFG_RESET_SHIFT              31
>> +#define CFG_EN_SHIFT                 30
>> +#define CFG_M_RETRY_CNT_SHIFT        16
>> +#define CFG_M_RETRY_CNT_MASK         0x0f
>> +
>> +#define TIM_CFG_OFFSET               0x04
>> +#define TIME_CFG_MODE_400_SHIFT      31
>> +
>> +#define M_FIFO_CTRL_OFFSET           0x0c
>> +#define M_FIFO_RX_FLUSH_SHIFT        31
>> +#define M_FIFO_TX_FLUSH_SHIFT        30
>> +#define M_FIFO_RX_CNT_SHIFT          16
>> +#define M_FIFO_RX_CNT_MASK           0x7f
>> +#define M_FIFO_RX_THLD_SHIFT         8
>> +#define M_FIFO_RX_THLD_MASK          0x3f
>> +
>> +#define M_CMD_OFFSET                 0x30
>> +#define M_CMD_START_BUSY_SHIFT       31
>> +#define M_CMD_STATUS_SHIFT           25
>> +#define M_CMD_STATUS_MASK            0x07
>> +#define M_CMD_STATUS_SUCCESS         0x0
>> +#define M_CMD_STATUS_LOST_ARB        0x1
>> +#define M_CMD_STATUS_NACK_ADDR       0x2
>> +#define M_CMD_STATUS_NACK_DATA       0x3
>> +#define M_CMD_STATUS_TIMEOUT         0x4
>> +#define M_CMD_PROTOCOL_SHIFT         9
>> +#define M_CMD_PROTOCOL_MASK          0xf
>> +#define M_CMD_PROTOCOL_BLK_WR        0x7
>> +#define M_CMD_PROTOCOL_BLK_RD        0x8
>> +#define M_CMD_PEC_SHIFT              8
>> +#define M_CMD_RD_CNT_SHIFT           0
>> +#define M_CMD_RD_CNT_MASK            0xff
>> +
>> +#define IE_OFFSET                    0x38
>> +#define IE_M_RX_FIFO_FULL_SHIFT      31
>> +#define IE_M_RX_THLD_SHIFT           30
>> +#define IE_M_START_BUSY_SHIFT        28
>> +
>> +#define IS_OFFSET                    0x3c
>> +#define IS_M_RX_FIFO_FULL_SHIFT      31
>> +#define IS_M_RX_THLD_SHIFT           30
>> +#define IS_M_START_BUSY_SHIFT        28
>> +
>> +#define M_TX_OFFSET                  0x40
>> +#define M_TX_WR_STATUS_SHIFT         31
>> +#define M_TX_DATA_SHIFT              0
>> +#define M_TX_DATA_MASK               0xff
>> +
>> +#define M_RX_OFFSET                  0x44
>> +#define M_RX_STATUS_SHIFT            30
>> +#define M_RX_STATUS_MASK             0x03
>> +#define M_RX_PEC_ERR_SHIFT           29
>> +#define M_RX_DATA_SHIFT              0
>> +#define M_RX_DATA_MASK               0xff
>> +
>> +#define I2C_TIMEOUT_MESC             100
>> +#define M_TX_RX_FIFO_SIZE            64
>> +
>> +enum bus_speed_index {
>> +    I2C_SPD_100K = 0,
>> +    I2C_SPD_400K,
>> +};
>> +
>> +struct bcm_iproc_i2c_dev {
>> +    struct device *device;
>> +
>> +    void __iomem *base;
>> +    struct i2c_msg *msg;
>> +
>> +    struct i2c_adapter adapter;
>> +
>> +    struct completion done;
>> +};
>> +
>> +/*
>> + * Can be expanded in the future if more interrupt status bits are
>> utilized
>> + */
>> +#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
>> +
>> +static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
>> +{
>> +    struct bcm_iproc_i2c_dev *dev = data;
>> +    u32 status = readl(dev->base + IS_OFFSET);
>> +
>> +    status &= ISR_MASK;
>> +
>> +    if (!status)
>> +        return IRQ_NONE;
>> +
>> +    writel(status, dev->base + IS_OFFSET);
>> +    complete_all(&dev->done);
>> +
>> +    return IRQ_HANDLED;
>> +}
>> +
>> +static int __wait_for_bus_idle(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +    unsigned long timeout = jiffies +
>> msecs_to_jiffies(I2C_TIMEOUT_MESC);
>> +
>> +    while (readl(dev->base + M_CMD_OFFSET) &
>> +            (1 << M_CMD_START_BUSY_SHIFT)) {
>> +        if (time_after(jiffies, timeout)) {
>> +            dev_err(dev->device, "wait for bus idle timeout\n");
>> +            return -ETIMEDOUT;
>> +        }
>> +    }
>> +
>> +    return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *dev,
>> +        struct i2c_msg *msg, u8 *addr)
>> +{
>
> Match open parenthesis..
>
> static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *dev,
>                       struct i2c_msg *msg, u8 *addr)
>
>
Okay I can make this change.
>> +
>> +    if (msg->flags & I2C_M_TEN) {
>> +        dev_err(dev->device, "no support for 10-bit address\n");
>> +        return -EINVAL;
>> +    }
>> +
>> +    *addr = (msg->addr << 1) & 0xfe;
>> +
>> +    if (msg->flags & I2C_M_RD)
>> +        *addr |= 1;
>> +
>> +    return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +    u32 val;
>> +
>> +    val = readl(dev->base + M_CMD_OFFSET);
>> +    val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
>> +
>> +    switch (val) {
>> +    case M_CMD_STATUS_SUCCESS:
>> +        return 0;
>> +
>> +    case M_CMD_STATUS_LOST_ARB:
>> +        dev_err(dev->device, "lost bus arbitration\n");
>> +        return -EREMOTEIO;
>> +
>> +    case M_CMD_STATUS_NACK_ADDR:
>> +        dev_err(dev->device, "NAK addr:0x%02x\n", dev->msg->addr);
>> +        return -EREMOTEIO;
>> +
>> +    case M_CMD_STATUS_NACK_DATA:
>> +        dev_err(dev->device, "NAK data\n");
>> +        return -EREMOTEIO;
>> +
>> +    case M_CMD_STATUS_TIMEOUT:
>> +        dev_err(dev->device, "bus timeout\n");
>> +        return -ETIMEDOUT;
>> +
>> +    default:
>> +        dev_err(dev->device, "unknown error code=%d\n", val);
>> +        return -EREMOTEIO;
>> +    }
>> +
>> +    return -EREMOTEIO;
>> +}
>> +
>> +static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *dev,
>> +        struct i2c_msg *msg)
>> +{
>
> dto...
>
One more indent? Sure.

>> +    int ret, i;
>> +    u8 addr;
>> +    u32 val;
>> +    unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
>> +
>> +    if (msg->len < 1 || msg->len > M_TX_RX_FIFO_SIZE - 1) {
>> +        dev_err(dev->device,
>> +            "supported data length is 1 - %u bytes\n",
>> +                M_TX_RX_FIFO_SIZE - 1);
>> +        return -EINVAL;
>> +    }
>> +
>> +    dev->msg = msg;
>> +    ret = __wait_for_bus_idle(dev);
>> +    if (ret)
>> +        return ret;
>> +
>> +    ret = bcm_iproc_i2c_format_addr(dev, msg, &addr);
>> +    if (ret)
>> +        return ret;
>> +
>> +    /* load slave address into the TX FIFO */
>> +    writel(addr, dev->base + M_TX_OFFSET);
>> +
>> +    /* for a write transaction, load data into the TX FIFO */
>> +    if (!(msg->flags & I2C_M_RD)) {
>> +        for (i = 0; i < msg->len; i++) {
>> +            val = msg->buf[i];
>> +
>> +            /* mark the last byte */
>> +            if (i == msg->len - 1)
>> +                val |= 1 << M_TX_WR_STATUS_SHIFT;
>> +
>> +            writel(val, dev->base + M_TX_OFFSET);
>> +        }
>> +    }
>> +
>> +    /* mark as incomplete before starting the transaction */
>> +    reinit_completion(&dev->done);
>> +
>> +    /*
>> +     * Enable the "start busy" interrupt, which will be triggered after
>> +     * the transaction is done
>> +     */
>> +    writel(1 << IE_M_START_BUSY_SHIFT, dev->base + IE_OFFSET);
>> +
>> +    /*
>> +     * Now we can activate the transfer. For a read operation,
>> specify the
>> +     * number of bytes to read
>> +     */
>> +    val = 1 << M_CMD_START_BUSY_SHIFT;
>> +    if (msg->flags & I2C_M_RD) {
>> +        val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
>> +            (msg->len << M_CMD_RD_CNT_SHIFT);
>> +    } else {
>> +        val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
>> +    }
>> +    writel(val, dev->base + M_CMD_OFFSET);
>> +
>> +    time_left = wait_for_completion_timeout(&dev->done, time_left);
>> +
>> +    /* disable all interrupts */
>> +    writel(0, dev->base + IE_OFFSET);
>> +
>> +    if (!time_left) {
>> +        dev_err(dev->device, "transaction times out\n");
>> +
>> +        /* flush FIFOs */
>> +        val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
>> +            (1 << M_FIFO_TX_FLUSH_SHIFT);
>> +        writel(val, dev->base + M_FIFO_CTRL_OFFSET);
>> +        return -EREMOTEIO;
>> +    }
>> +
>> +    ret = bcm_iproc_i2c_check_status(dev);
>> +    if (ret) {
>> +        /* flush both TX/RX FIFOs */
>> +        val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
>> +            (1 << M_FIFO_TX_FLUSH_SHIFT);
>> +        writel(val, dev->base + M_FIFO_CTRL_OFFSET);
>> +        return ret;
>> +    }
>> +
>> +    /*
>> +     * For a read operation, we now need to load the data from FIFO
>> +     * into the memory buffer
>> +     */
>> +    if (msg->flags & I2C_M_RD) {
>> +        for (i = 0; i < msg->len; i++) {
>> +            msg->buf[i] = (readl(dev->base + M_RX_OFFSET) >>
>> +                    M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
>> +        }
>> +    }
>> +
>> +    dev_dbg(dev->device, "xfer %c, addr=0x%02x, len=%d\n",
>> +            (msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
>> +            msg->len);
>> +    dev_dbg(dev->device, "**** data start ****\n");
>> +    for (i = 0; i < msg->len; i++)
>> +        dev_dbg(dev->device, "0x%02x ",  msg->buf[i]);
>> +    dev_dbg(dev->device, "**** data end ****\n");
>> +
>> +    return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
>> +                 struct i2c_msg msgs[], int num)
>> +{
>> +    struct bcm_iproc_i2c_dev *dev = i2c_get_adapdata(adapter);
>> +    int ret, i;
>> +
>> +    /* go through all messages */
>> +    for (i = 0; i < num; i++) {
>> +        ret = bcm_iproc_i2c_xfer_single_msg(dev, &msgs[i]);
>> +        if (ret) {
>> +            dev_err(dev->device, "xfer failed\n");
>> +            return ret;
>> +        }
>> +    }
>> +
>> +    return num;
>> +}
>> +
>> +static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
>> +{
>> +    return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
>> +}
>> +
>> +static const struct i2c_algorithm bcm_iproc_algo = {
>> +    .master_xfer = bcm_iproc_i2c_xfer,
>> +    .functionality = bcm_iproc_i2c_functionality,
>> +};
>> +
>> +static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +    unsigned int bus_speed, speed_bit;
>> +    u32 val;
>> +    int ret = of_property_read_u32(dev->device->of_node,
>> "clock-frequency",
>> +                       &bus_speed);
>> +    if (ret < 0) {
>> +        dev_err(dev->device, "missing clock-frequency property\n");
>> +        return -ENODEV;
>> +    }
>> +
>> +    switch (bus_speed) {
>> +    case 100000:
>> +        speed_bit = 0;
>> +        break;
>> +    case 400000:
>> +        speed_bit = 1;
>> +        break;
>> +    default:
>> +        dev_err(dev->device, "%d Hz bus speed not supported\n",
>> +                bus_speed);
>> +        dev_err(dev->device, "valid speeds are 100khz and 400khz\n");
>> +        return -EINVAL;
>> +    }
>> +
>> +    val = readl(dev->base + TIM_CFG_OFFSET);
>> +    val &= ~(1 << TIME_CFG_MODE_400_SHIFT);
>> +    val |= speed_bit << TIME_CFG_MODE_400_SHIFT;
>> +    writel(val, dev->base + TIM_CFG_OFFSET);
>> +
>> +    dev_info(dev->device, "bus set to %u Hz\n", bus_speed);
>> +
>> +    return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +    u32 val;
>> +
>> +    /* put controller in reset */
>> +    val = readl(dev->base + CFG_OFFSET);
>> +    val |= 1 << CFG_RESET_SHIFT;
>> +    val &= ~(1 << CFG_EN_SHIFT);
>> +    writel(val, dev->base + CFG_OFFSET);
>> +
>> +    /* wait 100 usec per spec */
>> +    udelay(100);
>> +
>> +    /* bring controller out of reset */
>> +    val = readl(dev->base + CFG_OFFSET);
>> +    val &= ~(1 << CFG_RESET_SHIFT);
>> +    writel(val, dev->base + CFG_OFFSET);
>> +
>> +    /* flush TX/RX FIFOs and set RX FIFO threshold to zero */
>> +    val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
>> +    writel(val, dev->base + M_FIFO_CTRL_OFFSET);
>> +
>> +    /* disable all interrupts */
>> +    val = 0;
>> +    writel(val, dev->base + IE_OFFSET);
>> +
>> +    /* clear all pending interrupts */
>> +    val = readl(dev->base + IS_OFFSET);
>> +    writel(val, dev->base + IS_OFFSET);
>> +
>> +    return 0;
>> +}
>> +
>> +static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +    u32 val;
>> +
>> +    val = readl(dev->base + CFG_OFFSET);
>> +    val |= 1 << CFG_EN_SHIFT;
>> +    writel(val, dev->base + CFG_OFFSET);
>> +}
>> +
>> +static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +    u32 val;
>> +
>> +    val = readl(dev->base + CFG_OFFSET);
>> +    val &= ~(1 << CFG_EN_SHIFT);
>> +    writel(val, dev->base + CFG_OFFSET);
>> +}
>> +
>> +static int bcm_iproc_i2c_probe(struct platform_device *pdev)
>> +{
>> +    int irq, ret = 0;
>> +    struct bcm_iproc_i2c_dev *dev;
>> +    struct i2c_adapter *adap;
>> +    struct resource *res;
>> +
>> +    dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
>> +    if (!dev)
>> +        return -ENOMEM;
>> +
>> +    platform_set_drvdata(pdev, dev);
>> +    dev->device = &pdev->dev;
>> +    init_completion(&dev->done);
>> +
>> +    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +    if (!res)
>> +        return -ENODEV;
>
> We can remove this resource check. This checking will happen with
> devm_ioremap_resource()
>
Don't you need to obtain a valid resource and pass it into 
devm_ioremap_resource? Without 'res' being assigned a valid resource, 
devm_ioremap_resource will reject with "invalid resource".

>> +    dev->base = devm_ioremap_resource(dev->device, res);
>> +    if (IS_ERR(dev->base))
>> +        return -ENOMEM;
>> +
>> +    ret = bcm_iproc_i2c_init(dev);
>> +    if (ret)
>> +        return ret;
>> +
>> +    ret = bcm_iproc_i2c_cfg_speed(dev);
>> +    if (ret)
>> +        return ret;
>> +
>> +    irq = platform_get_irq(pdev, 0);
>> +    if (irq < 0) {
>> +        dev_err(dev->device, "no irq resource\n");
>> +        return irq;
>> +    }
>> +
>> +    ret = devm_request_irq(&pdev->dev, irq, bcm_iproc_i2c_isr,
>> +            IRQF_SHARED, pdev->name, dev);
>> +    if (ret) {
>> +        dev_err(dev->device, "unable to request irq %i\n", irq);
>> +        return ret;
>> +    }
>> +
>> +    bcm_iproc_i2c_enable(dev);
>> +
>> +    adap = &dev->adapter;
>> +    i2c_set_adapdata(adap, dev);
>> +    strlcpy(adap->name, "Broadcom iProc I2C adapter",
>> sizeof(adap->name));
>> +    adap->algo = &bcm_iproc_algo;
>> +    adap->dev.parent = &pdev->dev;
>> +    adap->dev.of_node = pdev->dev.of_node;
>> +
>> +    ret = i2c_add_adapter(adap);
>> +    if (ret) {
>> +        dev_err(dev->device, "failed to add adapter\n");
>> +        return ret;
>> +    }
>> +
>> +    dev_info(dev->device, "device registered successfully\n");
>> +
>> +    return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
>> +{
>> +    struct bcm_iproc_i2c_dev *dev = platform_get_drvdata(pdev);
>> +
>> +    i2c_del_adapter(&dev->adapter);
>> +    bcm_iproc_i2c_disable(dev);
>> +
>> +    return 0;
>> +}
>> +
>> +static const struct of_device_id bcm_iproc_i2c_of_match[] = {
>> +    {.compatible = "brcm,iproc-i2c",},
>> +    {},
>> +};
>> +MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
>> +
>> +static struct platform_driver bcm_iproc_i2c_driver = {
>> +    .driver = {
>> +           .name = "bcm-iproc-i2c",
>> +           .owner = THIS_MODULE,
>
> No need to update this field. Its updated by module_platform_driver().
>
Okay will get rid of .owner = THIS_MODULES,

>> +           .of_match_table = bcm_iproc_i2c_of_match,
>> +           },
>> +    .probe = bcm_iproc_i2c_probe,
>> +    .remove = bcm_iproc_i2c_remove,
>> +};
>> +module_platform_driver(bcm_iproc_i2c_driver);
>> +
>> +MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
>> +MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
>> +MODULE_LICENSE("GPL v2");
>

Re: [PATCH 2/4] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 12/9/2014 5:33 PM, Varka Bhadram wrote:
>
> On Wednesday 10 December 2014 06:24 AM, Ray Jui wrote:
>> Add initial support to the Broadcom iProc I2C controller found in the
>> iProc family of SoCs.
>>
>> The iProc I2C controller has separate internal TX and RX FIFOs, each has
>> a size of 64 bytes. The iProc I2C controller supports two bus speeds
>> including standard mode (100kHz) and fast mode (400kHz)
>>
>> Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>> Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>> ---
>>   drivers/i2c/busses/Kconfig         |    9 +
>>   drivers/i2c/busses/Makefile        |    1 +
>>   drivers/i2c/busses/i2c-bcm-iproc.c |  503
>> ++++++++++++++++++++++++++++++++++++
>>   3 files changed, 513 insertions(+)
>>   create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c
>>
>> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
>> index c1351d9..8a2eb7e 100644
>> --- a/drivers/i2c/busses/Kconfig
>> +++ b/drivers/i2c/busses/Kconfig
>> @@ -372,6 +372,15 @@ config I2C_BCM2835
>>         This support is also available as a module.  If so, the module
>>         will be called i2c-bcm2835.
>> +config I2C_BCM_IPROC
>> +    tristate "Broadcom iProc I2C controller"
>> +    depends on ARCH_BCM_IPROC
>> +    help
>> +      If you say yes to this option, support will be included for the
>> +      Broadcom iProc I2C controller.
>> +
>> +      If you don't know what to do here, say N.
>> +
>>   config I2C_BCM_KONA
>>       tristate "BCM Kona I2C adapter"
>>       depends on ARCH_BCM_MOBILE
>> diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
>> index 5e6c822..216e7be 100644
>> --- a/drivers/i2c/busses/Makefile
>> +++ b/drivers/i2c/busses/Makefile
>> @@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)        += i2c-at91.o
>>   obj-$(CONFIG_I2C_AU1550)    += i2c-au1550.o
>>   obj-$(CONFIG_I2C_AXXIA)        += i2c-axxia.o
>>   obj-$(CONFIG_I2C_BCM2835)    += i2c-bcm2835.o
>> +obj-$(CONFIG_I2C_BCM_IPROC)    += i2c-bcm-iproc.o
>>   obj-$(CONFIG_I2C_BLACKFIN_TWI)    += i2c-bfin-twi.o
>>   obj-$(CONFIG_I2C_CADENCE)    += i2c-cadence.o
>>   obj-$(CONFIG_I2C_CBUS_GPIO)    += i2c-cbus-gpio.o
>> diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c
>> b/drivers/i2c/busses/i2c-bcm-iproc.c
>> new file mode 100644
>> index 0000000..0e6e603
>> --- /dev/null
>> +++ b/drivers/i2c/busses/i2c-bcm-iproc.c
>> @@ -0,0 +1,503 @@
>> +/*
>> + * Copyright (C) 2014 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#include <linux/device.h>
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/sched.h>
>> +#include <linux/i2c.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/clk.h>
>> +#include <linux/io.h>
>> +#include <linux/slab.h>
>> +#include <linux/delay.h>
>> +
>> +#define CFG_OFFSET                   0x00
>> +#define CFG_RESET_SHIFT              31
>> +#define CFG_EN_SHIFT                 30
>> +#define CFG_M_RETRY_CNT_SHIFT        16
>> +#define CFG_M_RETRY_CNT_MASK         0x0f
>> +
>> +#define TIM_CFG_OFFSET               0x04
>> +#define TIME_CFG_MODE_400_SHIFT      31
>> +
>> +#define M_FIFO_CTRL_OFFSET           0x0c
>> +#define M_FIFO_RX_FLUSH_SHIFT        31
>> +#define M_FIFO_TX_FLUSH_SHIFT        30
>> +#define M_FIFO_RX_CNT_SHIFT          16
>> +#define M_FIFO_RX_CNT_MASK           0x7f
>> +#define M_FIFO_RX_THLD_SHIFT         8
>> +#define M_FIFO_RX_THLD_MASK          0x3f
>> +
>> +#define M_CMD_OFFSET                 0x30
>> +#define M_CMD_START_BUSY_SHIFT       31
>> +#define M_CMD_STATUS_SHIFT           25
>> +#define M_CMD_STATUS_MASK            0x07
>> +#define M_CMD_STATUS_SUCCESS         0x0
>> +#define M_CMD_STATUS_LOST_ARB        0x1
>> +#define M_CMD_STATUS_NACK_ADDR       0x2
>> +#define M_CMD_STATUS_NACK_DATA       0x3
>> +#define M_CMD_STATUS_TIMEOUT         0x4
>> +#define M_CMD_PROTOCOL_SHIFT         9
>> +#define M_CMD_PROTOCOL_MASK          0xf
>> +#define M_CMD_PROTOCOL_BLK_WR        0x7
>> +#define M_CMD_PROTOCOL_BLK_RD        0x8
>> +#define M_CMD_PEC_SHIFT              8
>> +#define M_CMD_RD_CNT_SHIFT           0
>> +#define M_CMD_RD_CNT_MASK            0xff
>> +
>> +#define IE_OFFSET                    0x38
>> +#define IE_M_RX_FIFO_FULL_SHIFT      31
>> +#define IE_M_RX_THLD_SHIFT           30
>> +#define IE_M_START_BUSY_SHIFT        28
>> +
>> +#define IS_OFFSET                    0x3c
>> +#define IS_M_RX_FIFO_FULL_SHIFT      31
>> +#define IS_M_RX_THLD_SHIFT           30
>> +#define IS_M_START_BUSY_SHIFT        28
>> +
>> +#define M_TX_OFFSET                  0x40
>> +#define M_TX_WR_STATUS_SHIFT         31
>> +#define M_TX_DATA_SHIFT              0
>> +#define M_TX_DATA_MASK               0xff
>> +
>> +#define M_RX_OFFSET                  0x44
>> +#define M_RX_STATUS_SHIFT            30
>> +#define M_RX_STATUS_MASK             0x03
>> +#define M_RX_PEC_ERR_SHIFT           29
>> +#define M_RX_DATA_SHIFT              0
>> +#define M_RX_DATA_MASK               0xff
>> +
>> +#define I2C_TIMEOUT_MESC             100
>> +#define M_TX_RX_FIFO_SIZE            64
>> +
>> +enum bus_speed_index {
>> +    I2C_SPD_100K = 0,
>> +    I2C_SPD_400K,
>> +};
>> +
>> +struct bcm_iproc_i2c_dev {
>> +    struct device *device;
>> +
>> +    void __iomem *base;
>> +    struct i2c_msg *msg;
>> +
>> +    struct i2c_adapter adapter;
>> +
>> +    struct completion done;
>> +};
>> +
>> +/*
>> + * Can be expanded in the future if more interrupt status bits are
>> utilized
>> + */
>> +#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
>> +
>> +static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
>> +{
>> +    struct bcm_iproc_i2c_dev *dev = data;
>> +    u32 status = readl(dev->base + IS_OFFSET);
>> +
>> +    status &= ISR_MASK;
>> +
>> +    if (!status)
>> +        return IRQ_NONE;
>> +
>> +    writel(status, dev->base + IS_OFFSET);
>> +    complete_all(&dev->done);
>> +
>> +    return IRQ_HANDLED;
>> +}
>> +
>> +static int __wait_for_bus_idle(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +    unsigned long timeout = jiffies +
>> msecs_to_jiffies(I2C_TIMEOUT_MESC);
>> +
>> +    while (readl(dev->base + M_CMD_OFFSET) &
>> +            (1 << M_CMD_START_BUSY_SHIFT)) {
>> +        if (time_after(jiffies, timeout)) {
>> +            dev_err(dev->device, "wait for bus idle timeout\n");
>> +            return -ETIMEDOUT;
>> +        }
>> +    }
>> +
>> +    return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *dev,
>> +        struct i2c_msg *msg, u8 *addr)
>> +{
>
> Match open parenthesis..
>
> static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *dev,
>                       struct i2c_msg *msg, u8 *addr)
>
>
Okay I can make this change.
>> +
>> +    if (msg->flags & I2C_M_TEN) {
>> +        dev_err(dev->device, "no support for 10-bit address\n");
>> +        return -EINVAL;
>> +    }
>> +
>> +    *addr = (msg->addr << 1) & 0xfe;
>> +
>> +    if (msg->flags & I2C_M_RD)
>> +        *addr |= 1;
>> +
>> +    return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +    u32 val;
>> +
>> +    val = readl(dev->base + M_CMD_OFFSET);
>> +    val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
>> +
>> +    switch (val) {
>> +    case M_CMD_STATUS_SUCCESS:
>> +        return 0;
>> +
>> +    case M_CMD_STATUS_LOST_ARB:
>> +        dev_err(dev->device, "lost bus arbitration\n");
>> +        return -EREMOTEIO;
>> +
>> +    case M_CMD_STATUS_NACK_ADDR:
>> +        dev_err(dev->device, "NAK addr:0x%02x\n", dev->msg->addr);
>> +        return -EREMOTEIO;
>> +
>> +    case M_CMD_STATUS_NACK_DATA:
>> +        dev_err(dev->device, "NAK data\n");
>> +        return -EREMOTEIO;
>> +
>> +    case M_CMD_STATUS_TIMEOUT:
>> +        dev_err(dev->device, "bus timeout\n");
>> +        return -ETIMEDOUT;
>> +
>> +    default:
>> +        dev_err(dev->device, "unknown error code=%d\n", val);
>> +        return -EREMOTEIO;
>> +    }
>> +
>> +    return -EREMOTEIO;
>> +}
>> +
>> +static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *dev,
>> +        struct i2c_msg *msg)
>> +{
>
> dto...
>
One more indent? Sure.

>> +    int ret, i;
>> +    u8 addr;
>> +    u32 val;
>> +    unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
>> +
>> +    if (msg->len < 1 || msg->len > M_TX_RX_FIFO_SIZE - 1) {
>> +        dev_err(dev->device,
>> +            "supported data length is 1 - %u bytes\n",
>> +                M_TX_RX_FIFO_SIZE - 1);
>> +        return -EINVAL;
>> +    }
>> +
>> +    dev->msg = msg;
>> +    ret = __wait_for_bus_idle(dev);
>> +    if (ret)
>> +        return ret;
>> +
>> +    ret = bcm_iproc_i2c_format_addr(dev, msg, &addr);
>> +    if (ret)
>> +        return ret;
>> +
>> +    /* load slave address into the TX FIFO */
>> +    writel(addr, dev->base + M_TX_OFFSET);
>> +
>> +    /* for a write transaction, load data into the TX FIFO */
>> +    if (!(msg->flags & I2C_M_RD)) {
>> +        for (i = 0; i < msg->len; i++) {
>> +            val = msg->buf[i];
>> +
>> +            /* mark the last byte */
>> +            if (i == msg->len - 1)
>> +                val |= 1 << M_TX_WR_STATUS_SHIFT;
>> +
>> +            writel(val, dev->base + M_TX_OFFSET);
>> +        }
>> +    }
>> +
>> +    /* mark as incomplete before starting the transaction */
>> +    reinit_completion(&dev->done);
>> +
>> +    /*
>> +     * Enable the "start busy" interrupt, which will be triggered after
>> +     * the transaction is done
>> +     */
>> +    writel(1 << IE_M_START_BUSY_SHIFT, dev->base + IE_OFFSET);
>> +
>> +    /*
>> +     * Now we can activate the transfer. For a read operation,
>> specify the
>> +     * number of bytes to read
>> +     */
>> +    val = 1 << M_CMD_START_BUSY_SHIFT;
>> +    if (msg->flags & I2C_M_RD) {
>> +        val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
>> +            (msg->len << M_CMD_RD_CNT_SHIFT);
>> +    } else {
>> +        val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
>> +    }
>> +    writel(val, dev->base + M_CMD_OFFSET);
>> +
>> +    time_left = wait_for_completion_timeout(&dev->done, time_left);
>> +
>> +    /* disable all interrupts */
>> +    writel(0, dev->base + IE_OFFSET);
>> +
>> +    if (!time_left) {
>> +        dev_err(dev->device, "transaction times out\n");
>> +
>> +        /* flush FIFOs */
>> +        val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
>> +            (1 << M_FIFO_TX_FLUSH_SHIFT);
>> +        writel(val, dev->base + M_FIFO_CTRL_OFFSET);
>> +        return -EREMOTEIO;
>> +    }
>> +
>> +    ret = bcm_iproc_i2c_check_status(dev);
>> +    if (ret) {
>> +        /* flush both TX/RX FIFOs */
>> +        val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
>> +            (1 << M_FIFO_TX_FLUSH_SHIFT);
>> +        writel(val, dev->base + M_FIFO_CTRL_OFFSET);
>> +        return ret;
>> +    }
>> +
>> +    /*
>> +     * For a read operation, we now need to load the data from FIFO
>> +     * into the memory buffer
>> +     */
>> +    if (msg->flags & I2C_M_RD) {
>> +        for (i = 0; i < msg->len; i++) {
>> +            msg->buf[i] = (readl(dev->base + M_RX_OFFSET) >>
>> +                    M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
>> +        }
>> +    }
>> +
>> +    dev_dbg(dev->device, "xfer %c, addr=0x%02x, len=%d\n",
>> +            (msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
>> +            msg->len);
>> +    dev_dbg(dev->device, "**** data start ****\n");
>> +    for (i = 0; i < msg->len; i++)
>> +        dev_dbg(dev->device, "0x%02x ",  msg->buf[i]);
>> +    dev_dbg(dev->device, "**** data end ****\n");
>> +
>> +    return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
>> +                 struct i2c_msg msgs[], int num)
>> +{
>> +    struct bcm_iproc_i2c_dev *dev = i2c_get_adapdata(adapter);
>> +    int ret, i;
>> +
>> +    /* go through all messages */
>> +    for (i = 0; i < num; i++) {
>> +        ret = bcm_iproc_i2c_xfer_single_msg(dev, &msgs[i]);
>> +        if (ret) {
>> +            dev_err(dev->device, "xfer failed\n");
>> +            return ret;
>> +        }
>> +    }
>> +
>> +    return num;
>> +}
>> +
>> +static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
>> +{
>> +    return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
>> +}
>> +
>> +static const struct i2c_algorithm bcm_iproc_algo = {
>> +    .master_xfer = bcm_iproc_i2c_xfer,
>> +    .functionality = bcm_iproc_i2c_functionality,
>> +};
>> +
>> +static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +    unsigned int bus_speed, speed_bit;
>> +    u32 val;
>> +    int ret = of_property_read_u32(dev->device->of_node,
>> "clock-frequency",
>> +                       &bus_speed);
>> +    if (ret < 0) {
>> +        dev_err(dev->device, "missing clock-frequency property\n");
>> +        return -ENODEV;
>> +    }
>> +
>> +    switch (bus_speed) {
>> +    case 100000:
>> +        speed_bit = 0;
>> +        break;
>> +    case 400000:
>> +        speed_bit = 1;
>> +        break;
>> +    default:
>> +        dev_err(dev->device, "%d Hz bus speed not supported\n",
>> +                bus_speed);
>> +        dev_err(dev->device, "valid speeds are 100khz and 400khz\n");
>> +        return -EINVAL;
>> +    }
>> +
>> +    val = readl(dev->base + TIM_CFG_OFFSET);
>> +    val &= ~(1 << TIME_CFG_MODE_400_SHIFT);
>> +    val |= speed_bit << TIME_CFG_MODE_400_SHIFT;
>> +    writel(val, dev->base + TIM_CFG_OFFSET);
>> +
>> +    dev_info(dev->device, "bus set to %u Hz\n", bus_speed);
>> +
>> +    return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +    u32 val;
>> +
>> +    /* put controller in reset */
>> +    val = readl(dev->base + CFG_OFFSET);
>> +    val |= 1 << CFG_RESET_SHIFT;
>> +    val &= ~(1 << CFG_EN_SHIFT);
>> +    writel(val, dev->base + CFG_OFFSET);
>> +
>> +    /* wait 100 usec per spec */
>> +    udelay(100);
>> +
>> +    /* bring controller out of reset */
>> +    val = readl(dev->base + CFG_OFFSET);
>> +    val &= ~(1 << CFG_RESET_SHIFT);
>> +    writel(val, dev->base + CFG_OFFSET);
>> +
>> +    /* flush TX/RX FIFOs and set RX FIFO threshold to zero */
>> +    val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
>> +    writel(val, dev->base + M_FIFO_CTRL_OFFSET);
>> +
>> +    /* disable all interrupts */
>> +    val = 0;
>> +    writel(val, dev->base + IE_OFFSET);
>> +
>> +    /* clear all pending interrupts */
>> +    val = readl(dev->base + IS_OFFSET);
>> +    writel(val, dev->base + IS_OFFSET);
>> +
>> +    return 0;
>> +}
>> +
>> +static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +    u32 val;
>> +
>> +    val = readl(dev->base + CFG_OFFSET);
>> +    val |= 1 << CFG_EN_SHIFT;
>> +    writel(val, dev->base + CFG_OFFSET);
>> +}
>> +
>> +static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +    u32 val;
>> +
>> +    val = readl(dev->base + CFG_OFFSET);
>> +    val &= ~(1 << CFG_EN_SHIFT);
>> +    writel(val, dev->base + CFG_OFFSET);
>> +}
>> +
>> +static int bcm_iproc_i2c_probe(struct platform_device *pdev)
>> +{
>> +    int irq, ret = 0;
>> +    struct bcm_iproc_i2c_dev *dev;
>> +    struct i2c_adapter *adap;
>> +    struct resource *res;
>> +
>> +    dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
>> +    if (!dev)
>> +        return -ENOMEM;
>> +
>> +    platform_set_drvdata(pdev, dev);
>> +    dev->device = &pdev->dev;
>> +    init_completion(&dev->done);
>> +
>> +    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +    if (!res)
>> +        return -ENODEV;
>
> We can remove this resource check. This checking will happen with
> devm_ioremap_resource()
>
Don't you need to obtain a valid resource and pass it into 
devm_ioremap_resource? Without 'res' being assigned a valid resource, 
devm_ioremap_resource will reject with "invalid resource".

>> +    dev->base = devm_ioremap_resource(dev->device, res);
>> +    if (IS_ERR(dev->base))
>> +        return -ENOMEM;
>> +
>> +    ret = bcm_iproc_i2c_init(dev);
>> +    if (ret)
>> +        return ret;
>> +
>> +    ret = bcm_iproc_i2c_cfg_speed(dev);
>> +    if (ret)
>> +        return ret;
>> +
>> +    irq = platform_get_irq(pdev, 0);
>> +    if (irq < 0) {
>> +        dev_err(dev->device, "no irq resource\n");
>> +        return irq;
>> +    }
>> +
>> +    ret = devm_request_irq(&pdev->dev, irq, bcm_iproc_i2c_isr,
>> +            IRQF_SHARED, pdev->name, dev);
>> +    if (ret) {
>> +        dev_err(dev->device, "unable to request irq %i\n", irq);
>> +        return ret;
>> +    }
>> +
>> +    bcm_iproc_i2c_enable(dev);
>> +
>> +    adap = &dev->adapter;
>> +    i2c_set_adapdata(adap, dev);
>> +    strlcpy(adap->name, "Broadcom iProc I2C adapter",
>> sizeof(adap->name));
>> +    adap->algo = &bcm_iproc_algo;
>> +    adap->dev.parent = &pdev->dev;
>> +    adap->dev.of_node = pdev->dev.of_node;
>> +
>> +    ret = i2c_add_adapter(adap);
>> +    if (ret) {
>> +        dev_err(dev->device, "failed to add adapter\n");
>> +        return ret;
>> +    }
>> +
>> +    dev_info(dev->device, "device registered successfully\n");
>> +
>> +    return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
>> +{
>> +    struct bcm_iproc_i2c_dev *dev = platform_get_drvdata(pdev);
>> +
>> +    i2c_del_adapter(&dev->adapter);
>> +    bcm_iproc_i2c_disable(dev);
>> +
>> +    return 0;
>> +}
>> +
>> +static const struct of_device_id bcm_iproc_i2c_of_match[] = {
>> +    {.compatible = "brcm,iproc-i2c",},
>> +    {},
>> +};
>> +MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
>> +
>> +static struct platform_driver bcm_iproc_i2c_driver = {
>> +    .driver = {
>> +           .name = "bcm-iproc-i2c",
>> +           .owner = THIS_MODULE,
>
> No need to update this field. Its updated by module_platform_driver().
>
Okay will get rid of .owner = THIS_MODULES,

>> +           .of_match_table = bcm_iproc_i2c_of_match,
>> +           },
>> +    .probe = bcm_iproc_i2c_probe,
>> +    .remove = bcm_iproc_i2c_remove,
>> +};
>> +module_platform_driver(bcm_iproc_i2c_driver);
>> +
>> +MODULE_AUTHOR("Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>");
>> +MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
>> +MODULE_LICENSE("GPL v2");
>

[PATCH 2/4] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 12/9/2014 5:33 PM, Varka Bhadram wrote:
>
> On Wednesday 10 December 2014 06:24 AM, Ray Jui wrote:
>> Add initial support to the Broadcom iProc I2C controller found in the
>> iProc family of SoCs.
>>
>> The iProc I2C controller has separate internal TX and RX FIFOs, each has
>> a size of 64 bytes. The iProc I2C controller supports two bus speeds
>> including standard mode (100kHz) and fast mode (400kHz)
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>> ---
>>   drivers/i2c/busses/Kconfig         |    9 +
>>   drivers/i2c/busses/Makefile        |    1 +
>>   drivers/i2c/busses/i2c-bcm-iproc.c |  503
>> ++++++++++++++++++++++++++++++++++++
>>   3 files changed, 513 insertions(+)
>>   create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c
>>
>> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
>> index c1351d9..8a2eb7e 100644
>> --- a/drivers/i2c/busses/Kconfig
>> +++ b/drivers/i2c/busses/Kconfig
>> @@ -372,6 +372,15 @@ config I2C_BCM2835
>>         This support is also available as a module.  If so, the module
>>         will be called i2c-bcm2835.
>> +config I2C_BCM_IPROC
>> +    tristate "Broadcom iProc I2C controller"
>> +    depends on ARCH_BCM_IPROC
>> +    help
>> +      If you say yes to this option, support will be included for the
>> +      Broadcom iProc I2C controller.
>> +
>> +      If you don't know what to do here, say N.
>> +
>>   config I2C_BCM_KONA
>>       tristate "BCM Kona I2C adapter"
>>       depends on ARCH_BCM_MOBILE
>> diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
>> index 5e6c822..216e7be 100644
>> --- a/drivers/i2c/busses/Makefile
>> +++ b/drivers/i2c/busses/Makefile
>> @@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)        += i2c-at91.o
>>   obj-$(CONFIG_I2C_AU1550)    += i2c-au1550.o
>>   obj-$(CONFIG_I2C_AXXIA)        += i2c-axxia.o
>>   obj-$(CONFIG_I2C_BCM2835)    += i2c-bcm2835.o
>> +obj-$(CONFIG_I2C_BCM_IPROC)    += i2c-bcm-iproc.o
>>   obj-$(CONFIG_I2C_BLACKFIN_TWI)    += i2c-bfin-twi.o
>>   obj-$(CONFIG_I2C_CADENCE)    += i2c-cadence.o
>>   obj-$(CONFIG_I2C_CBUS_GPIO)    += i2c-cbus-gpio.o
>> diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c
>> b/drivers/i2c/busses/i2c-bcm-iproc.c
>> new file mode 100644
>> index 0000000..0e6e603
>> --- /dev/null
>> +++ b/drivers/i2c/busses/i2c-bcm-iproc.c
>> @@ -0,0 +1,503 @@
>> +/*
>> + * Copyright (C) 2014 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#include <linux/device.h>
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/sched.h>
>> +#include <linux/i2c.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/clk.h>
>> +#include <linux/io.h>
>> +#include <linux/slab.h>
>> +#include <linux/delay.h>
>> +
>> +#define CFG_OFFSET                   0x00
>> +#define CFG_RESET_SHIFT              31
>> +#define CFG_EN_SHIFT                 30
>> +#define CFG_M_RETRY_CNT_SHIFT        16
>> +#define CFG_M_RETRY_CNT_MASK         0x0f
>> +
>> +#define TIM_CFG_OFFSET               0x04
>> +#define TIME_CFG_MODE_400_SHIFT      31
>> +
>> +#define M_FIFO_CTRL_OFFSET           0x0c
>> +#define M_FIFO_RX_FLUSH_SHIFT        31
>> +#define M_FIFO_TX_FLUSH_SHIFT        30
>> +#define M_FIFO_RX_CNT_SHIFT          16
>> +#define M_FIFO_RX_CNT_MASK           0x7f
>> +#define M_FIFO_RX_THLD_SHIFT         8
>> +#define M_FIFO_RX_THLD_MASK          0x3f
>> +
>> +#define M_CMD_OFFSET                 0x30
>> +#define M_CMD_START_BUSY_SHIFT       31
>> +#define M_CMD_STATUS_SHIFT           25
>> +#define M_CMD_STATUS_MASK            0x07
>> +#define M_CMD_STATUS_SUCCESS         0x0
>> +#define M_CMD_STATUS_LOST_ARB        0x1
>> +#define M_CMD_STATUS_NACK_ADDR       0x2
>> +#define M_CMD_STATUS_NACK_DATA       0x3
>> +#define M_CMD_STATUS_TIMEOUT         0x4
>> +#define M_CMD_PROTOCOL_SHIFT         9
>> +#define M_CMD_PROTOCOL_MASK          0xf
>> +#define M_CMD_PROTOCOL_BLK_WR        0x7
>> +#define M_CMD_PROTOCOL_BLK_RD        0x8
>> +#define M_CMD_PEC_SHIFT              8
>> +#define M_CMD_RD_CNT_SHIFT           0
>> +#define M_CMD_RD_CNT_MASK            0xff
>> +
>> +#define IE_OFFSET                    0x38
>> +#define IE_M_RX_FIFO_FULL_SHIFT      31
>> +#define IE_M_RX_THLD_SHIFT           30
>> +#define IE_M_START_BUSY_SHIFT        28
>> +
>> +#define IS_OFFSET                    0x3c
>> +#define IS_M_RX_FIFO_FULL_SHIFT      31
>> +#define IS_M_RX_THLD_SHIFT           30
>> +#define IS_M_START_BUSY_SHIFT        28
>> +
>> +#define M_TX_OFFSET                  0x40
>> +#define M_TX_WR_STATUS_SHIFT         31
>> +#define M_TX_DATA_SHIFT              0
>> +#define M_TX_DATA_MASK               0xff
>> +
>> +#define M_RX_OFFSET                  0x44
>> +#define M_RX_STATUS_SHIFT            30
>> +#define M_RX_STATUS_MASK             0x03
>> +#define M_RX_PEC_ERR_SHIFT           29
>> +#define M_RX_DATA_SHIFT              0
>> +#define M_RX_DATA_MASK               0xff
>> +
>> +#define I2C_TIMEOUT_MESC             100
>> +#define M_TX_RX_FIFO_SIZE            64
>> +
>> +enum bus_speed_index {
>> +    I2C_SPD_100K = 0,
>> +    I2C_SPD_400K,
>> +};
>> +
>> +struct bcm_iproc_i2c_dev {
>> +    struct device *device;
>> +
>> +    void __iomem *base;
>> +    struct i2c_msg *msg;
>> +
>> +    struct i2c_adapter adapter;
>> +
>> +    struct completion done;
>> +};
>> +
>> +/*
>> + * Can be expanded in the future if more interrupt status bits are
>> utilized
>> + */
>> +#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
>> +
>> +static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
>> +{
>> +    struct bcm_iproc_i2c_dev *dev = data;
>> +    u32 status = readl(dev->base + IS_OFFSET);
>> +
>> +    status &= ISR_MASK;
>> +
>> +    if (!status)
>> +        return IRQ_NONE;
>> +
>> +    writel(status, dev->base + IS_OFFSET);
>> +    complete_all(&dev->done);
>> +
>> +    return IRQ_HANDLED;
>> +}
>> +
>> +static int __wait_for_bus_idle(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +    unsigned long timeout = jiffies +
>> msecs_to_jiffies(I2C_TIMEOUT_MESC);
>> +
>> +    while (readl(dev->base + M_CMD_OFFSET) &
>> +            (1 << M_CMD_START_BUSY_SHIFT)) {
>> +        if (time_after(jiffies, timeout)) {
>> +            dev_err(dev->device, "wait for bus idle timeout\n");
>> +            return -ETIMEDOUT;
>> +        }
>> +    }
>> +
>> +    return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *dev,
>> +        struct i2c_msg *msg, u8 *addr)
>> +{
>
> Match open parenthesis..
>
> static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *dev,
>                       struct i2c_msg *msg, u8 *addr)
>
>
Okay I can make this change.
>> +
>> +    if (msg->flags & I2C_M_TEN) {
>> +        dev_err(dev->device, "no support for 10-bit address\n");
>> +        return -EINVAL;
>> +    }
>> +
>> +    *addr = (msg->addr << 1) & 0xfe;
>> +
>> +    if (msg->flags & I2C_M_RD)
>> +        *addr |= 1;
>> +
>> +    return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +    u32 val;
>> +
>> +    val = readl(dev->base + M_CMD_OFFSET);
>> +    val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
>> +
>> +    switch (val) {
>> +    case M_CMD_STATUS_SUCCESS:
>> +        return 0;
>> +
>> +    case M_CMD_STATUS_LOST_ARB:
>> +        dev_err(dev->device, "lost bus arbitration\n");
>> +        return -EREMOTEIO;
>> +
>> +    case M_CMD_STATUS_NACK_ADDR:
>> +        dev_err(dev->device, "NAK addr:0x%02x\n", dev->msg->addr);
>> +        return -EREMOTEIO;
>> +
>> +    case M_CMD_STATUS_NACK_DATA:
>> +        dev_err(dev->device, "NAK data\n");
>> +        return -EREMOTEIO;
>> +
>> +    case M_CMD_STATUS_TIMEOUT:
>> +        dev_err(dev->device, "bus timeout\n");
>> +        return -ETIMEDOUT;
>> +
>> +    default:
>> +        dev_err(dev->device, "unknown error code=%d\n", val);
>> +        return -EREMOTEIO;
>> +    }
>> +
>> +    return -EREMOTEIO;
>> +}
>> +
>> +static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *dev,
>> +        struct i2c_msg *msg)
>> +{
>
> dto...
>
One more indent? Sure.

>> +    int ret, i;
>> +    u8 addr;
>> +    u32 val;
>> +    unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
>> +
>> +    if (msg->len < 1 || msg->len > M_TX_RX_FIFO_SIZE - 1) {
>> +        dev_err(dev->device,
>> +            "supported data length is 1 - %u bytes\n",
>> +                M_TX_RX_FIFO_SIZE - 1);
>> +        return -EINVAL;
>> +    }
>> +
>> +    dev->msg = msg;
>> +    ret = __wait_for_bus_idle(dev);
>> +    if (ret)
>> +        return ret;
>> +
>> +    ret = bcm_iproc_i2c_format_addr(dev, msg, &addr);
>> +    if (ret)
>> +        return ret;
>> +
>> +    /* load slave address into the TX FIFO */
>> +    writel(addr, dev->base + M_TX_OFFSET);
>> +
>> +    /* for a write transaction, load data into the TX FIFO */
>> +    if (!(msg->flags & I2C_M_RD)) {
>> +        for (i = 0; i < msg->len; i++) {
>> +            val = msg->buf[i];
>> +
>> +            /* mark the last byte */
>> +            if (i == msg->len - 1)
>> +                val |= 1 << M_TX_WR_STATUS_SHIFT;
>> +
>> +            writel(val, dev->base + M_TX_OFFSET);
>> +        }
>> +    }
>> +
>> +    /* mark as incomplete before starting the transaction */
>> +    reinit_completion(&dev->done);
>> +
>> +    /*
>> +     * Enable the "start busy" interrupt, which will be triggered after
>> +     * the transaction is done
>> +     */
>> +    writel(1 << IE_M_START_BUSY_SHIFT, dev->base + IE_OFFSET);
>> +
>> +    /*
>> +     * Now we can activate the transfer. For a read operation,
>> specify the
>> +     * number of bytes to read
>> +     */
>> +    val = 1 << M_CMD_START_BUSY_SHIFT;
>> +    if (msg->flags & I2C_M_RD) {
>> +        val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
>> +            (msg->len << M_CMD_RD_CNT_SHIFT);
>> +    } else {
>> +        val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
>> +    }
>> +    writel(val, dev->base + M_CMD_OFFSET);
>> +
>> +    time_left = wait_for_completion_timeout(&dev->done, time_left);
>> +
>> +    /* disable all interrupts */
>> +    writel(0, dev->base + IE_OFFSET);
>> +
>> +    if (!time_left) {
>> +        dev_err(dev->device, "transaction times out\n");
>> +
>> +        /* flush FIFOs */
>> +        val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
>> +            (1 << M_FIFO_TX_FLUSH_SHIFT);
>> +        writel(val, dev->base + M_FIFO_CTRL_OFFSET);
>> +        return -EREMOTEIO;
>> +    }
>> +
>> +    ret = bcm_iproc_i2c_check_status(dev);
>> +    if (ret) {
>> +        /* flush both TX/RX FIFOs */
>> +        val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
>> +            (1 << M_FIFO_TX_FLUSH_SHIFT);
>> +        writel(val, dev->base + M_FIFO_CTRL_OFFSET);
>> +        return ret;
>> +    }
>> +
>> +    /*
>> +     * For a read operation, we now need to load the data from FIFO
>> +     * into the memory buffer
>> +     */
>> +    if (msg->flags & I2C_M_RD) {
>> +        for (i = 0; i < msg->len; i++) {
>> +            msg->buf[i] = (readl(dev->base + M_RX_OFFSET) >>
>> +                    M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
>> +        }
>> +    }
>> +
>> +    dev_dbg(dev->device, "xfer %c, addr=0x%02x, len=%d\n",
>> +            (msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
>> +            msg->len);
>> +    dev_dbg(dev->device, "**** data start ****\n");
>> +    for (i = 0; i < msg->len; i++)
>> +        dev_dbg(dev->device, "0x%02x ",  msg->buf[i]);
>> +    dev_dbg(dev->device, "**** data end ****\n");
>> +
>> +    return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
>> +                 struct i2c_msg msgs[], int num)
>> +{
>> +    struct bcm_iproc_i2c_dev *dev = i2c_get_adapdata(adapter);
>> +    int ret, i;
>> +
>> +    /* go through all messages */
>> +    for (i = 0; i < num; i++) {
>> +        ret = bcm_iproc_i2c_xfer_single_msg(dev, &msgs[i]);
>> +        if (ret) {
>> +            dev_err(dev->device, "xfer failed\n");
>> +            return ret;
>> +        }
>> +    }
>> +
>> +    return num;
>> +}
>> +
>> +static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
>> +{
>> +    return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
>> +}
>> +
>> +static const struct i2c_algorithm bcm_iproc_algo = {
>> +    .master_xfer = bcm_iproc_i2c_xfer,
>> +    .functionality = bcm_iproc_i2c_functionality,
>> +};
>> +
>> +static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +    unsigned int bus_speed, speed_bit;
>> +    u32 val;
>> +    int ret = of_property_read_u32(dev->device->of_node,
>> "clock-frequency",
>> +                       &bus_speed);
>> +    if (ret < 0) {
>> +        dev_err(dev->device, "missing clock-frequency property\n");
>> +        return -ENODEV;
>> +    }
>> +
>> +    switch (bus_speed) {
>> +    case 100000:
>> +        speed_bit = 0;
>> +        break;
>> +    case 400000:
>> +        speed_bit = 1;
>> +        break;
>> +    default:
>> +        dev_err(dev->device, "%d Hz bus speed not supported\n",
>> +                bus_speed);
>> +        dev_err(dev->device, "valid speeds are 100khz and 400khz\n");
>> +        return -EINVAL;
>> +    }
>> +
>> +    val = readl(dev->base + TIM_CFG_OFFSET);
>> +    val &= ~(1 << TIME_CFG_MODE_400_SHIFT);
>> +    val |= speed_bit << TIME_CFG_MODE_400_SHIFT;
>> +    writel(val, dev->base + TIM_CFG_OFFSET);
>> +
>> +    dev_info(dev->device, "bus set to %u Hz\n", bus_speed);
>> +
>> +    return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +    u32 val;
>> +
>> +    /* put controller in reset */
>> +    val = readl(dev->base + CFG_OFFSET);
>> +    val |= 1 << CFG_RESET_SHIFT;
>> +    val &= ~(1 << CFG_EN_SHIFT);
>> +    writel(val, dev->base + CFG_OFFSET);
>> +
>> +    /* wait 100 usec per spec */
>> +    udelay(100);
>> +
>> +    /* bring controller out of reset */
>> +    val = readl(dev->base + CFG_OFFSET);
>> +    val &= ~(1 << CFG_RESET_SHIFT);
>> +    writel(val, dev->base + CFG_OFFSET);
>> +
>> +    /* flush TX/RX FIFOs and set RX FIFO threshold to zero */
>> +    val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
>> +    writel(val, dev->base + M_FIFO_CTRL_OFFSET);
>> +
>> +    /* disable all interrupts */
>> +    val = 0;
>> +    writel(val, dev->base + IE_OFFSET);
>> +
>> +    /* clear all pending interrupts */
>> +    val = readl(dev->base + IS_OFFSET);
>> +    writel(val, dev->base + IS_OFFSET);
>> +
>> +    return 0;
>> +}
>> +
>> +static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +    u32 val;
>> +
>> +    val = readl(dev->base + CFG_OFFSET);
>> +    val |= 1 << CFG_EN_SHIFT;
>> +    writel(val, dev->base + CFG_OFFSET);
>> +}
>> +
>> +static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +    u32 val;
>> +
>> +    val = readl(dev->base + CFG_OFFSET);
>> +    val &= ~(1 << CFG_EN_SHIFT);
>> +    writel(val, dev->base + CFG_OFFSET);
>> +}
>> +
>> +static int bcm_iproc_i2c_probe(struct platform_device *pdev)
>> +{
>> +    int irq, ret = 0;
>> +    struct bcm_iproc_i2c_dev *dev;
>> +    struct i2c_adapter *adap;
>> +    struct resource *res;
>> +
>> +    dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
>> +    if (!dev)
>> +        return -ENOMEM;
>> +
>> +    platform_set_drvdata(pdev, dev);
>> +    dev->device = &pdev->dev;
>> +    init_completion(&dev->done);
>> +
>> +    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +    if (!res)
>> +        return -ENODEV;
>
> We can remove this resource check. This checking will happen with
> devm_ioremap_resource()
>
Don't you need to obtain a valid resource and pass it into 
devm_ioremap_resource? Without 'res' being assigned a valid resource, 
devm_ioremap_resource will reject with "invalid resource".

>> +    dev->base = devm_ioremap_resource(dev->device, res);
>> +    if (IS_ERR(dev->base))
>> +        return -ENOMEM;
>> +
>> +    ret = bcm_iproc_i2c_init(dev);
>> +    if (ret)
>> +        return ret;
>> +
>> +    ret = bcm_iproc_i2c_cfg_speed(dev);
>> +    if (ret)
>> +        return ret;
>> +
>> +    irq = platform_get_irq(pdev, 0);
>> +    if (irq < 0) {
>> +        dev_err(dev->device, "no irq resource\n");
>> +        return irq;
>> +    }
>> +
>> +    ret = devm_request_irq(&pdev->dev, irq, bcm_iproc_i2c_isr,
>> +            IRQF_SHARED, pdev->name, dev);
>> +    if (ret) {
>> +        dev_err(dev->device, "unable to request irq %i\n", irq);
>> +        return ret;
>> +    }
>> +
>> +    bcm_iproc_i2c_enable(dev);
>> +
>> +    adap = &dev->adapter;
>> +    i2c_set_adapdata(adap, dev);
>> +    strlcpy(adap->name, "Broadcom iProc I2C adapter",
>> sizeof(adap->name));
>> +    adap->algo = &bcm_iproc_algo;
>> +    adap->dev.parent = &pdev->dev;
>> +    adap->dev.of_node = pdev->dev.of_node;
>> +
>> +    ret = i2c_add_adapter(adap);
>> +    if (ret) {
>> +        dev_err(dev->device, "failed to add adapter\n");
>> +        return ret;
>> +    }
>> +
>> +    dev_info(dev->device, "device registered successfully\n");
>> +
>> +    return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
>> +{
>> +    struct bcm_iproc_i2c_dev *dev = platform_get_drvdata(pdev);
>> +
>> +    i2c_del_adapter(&dev->adapter);
>> +    bcm_iproc_i2c_disable(dev);
>> +
>> +    return 0;
>> +}
>> +
>> +static const struct of_device_id bcm_iproc_i2c_of_match[] = {
>> +    {.compatible = "brcm,iproc-i2c",},
>> +    {},
>> +};
>> +MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
>> +
>> +static struct platform_driver bcm_iproc_i2c_driver = {
>> +    .driver = {
>> +           .name = "bcm-iproc-i2c",
>> +           .owner = THIS_MODULE,
>
> No need to update this field. Its updated by module_platform_driver().
>
Okay will get rid of .owner = THIS_MODULES,

>> +           .of_match_table = bcm_iproc_i2c_of_match,
>> +           },
>> +    .probe = bcm_iproc_i2c_probe,
>> +    .remove = bcm_iproc_i2c_remove,
>> +};
>> +module_platform_driver(bcm_iproc_i2c_driver);
>> +
>> +MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
>> +MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
>> +MODULE_LICENSE("GPL v2");
>

[PATCH v2 0/4] Add I2C support to Broadcom iProc

[Ray Jui]

This patchset contains the initial I2C support for Broadcom iProc family of
SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has a
size of 64 bytes. The iProc I2C controller supports two bus speeds including
standard mode (100 kHz) and fast mode (400 kHz)

Changes from v1:
 - Fix function argument parenthesis
 - Get rid of redundant driver owner field

Ray Jui (4):
  i2c: iProc: define Broadcom iProc I2C binding
  i2c: iproc: Add Broadcom iProc I2C Driver
  ARM: mach-bcm: Enable I2C support for iProc
  ARM: dts: add I2C device nodes for Broadcom Cygnus

 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   20 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/i2c/busses/Kconfig                         |    9 +
 drivers/i2c/busses/Makefile                        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c                 |  502 ++++++++++++++++++++
 6 files changed, 570 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

-- 
1.7.9.5

[PATCH v2 0/4] Add I2C support to Broadcom iProc

[Ray Jui]

This patchset contains the initial I2C support for Broadcom iProc family of
SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has a
size of 64 bytes. The iProc I2C controller supports two bus speeds including
standard mode (100 kHz) and fast mode (400 kHz)

Changes from v1:
 - Fix function argument parenthesis
 - Get rid of redundant driver owner field

Ray Jui (4):
  i2c: iProc: define Broadcom iProc I2C binding
  i2c: iproc: Add Broadcom iProc I2C Driver
  ARM: mach-bcm: Enable I2C support for iProc
  ARM: dts: add I2C device nodes for Broadcom Cygnus

 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   20 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/i2c/busses/Kconfig                         |    9 +
 drivers/i2c/busses/Makefile                        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c                 |  502 ++++++++++++++++++++
 6 files changed, 570 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

-- 
1.7.9.5

[PATCH v2 0/4] Add I2C support to Broadcom iProc

[Ray Jui]

This patchset contains the initial I2C support for Broadcom iProc family of
SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has a
size of 64 bytes. The iProc I2C controller supports two bus speeds including
standard mode (100 kHz) and fast mode (400 kHz)

Changes from v1:
 - Fix function argument parenthesis
 - Get rid of redundant driver owner field

Ray Jui (4):
  i2c: iProc: define Broadcom iProc I2C binding
  i2c: iproc: Add Broadcom iProc I2C Driver
  ARM: mach-bcm: Enable I2C support for iProc
  ARM: dts: add I2C device nodes for Broadcom Cygnus

 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   20 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/i2c/busses/Kconfig                         |    9 +
 drivers/i2c/busses/Makefile                        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c                 |  502 ++++++++++++++++++++
 6 files changed, 570 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

-- 
1.7.9.5

[PATCH v2 1/4] i2c: iProc: define Broadcom iProc I2C binding

[Ray Jui]

Document the I2C device tree binding for Broadcom iProc family of
SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt

diff --git a/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
new file mode 100644
index 0000000..81f982c
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
@@ -0,0 +1,37 @@
+Broadcom iProc I2C controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,iproc-i2c"
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+    I2C controller registers
+
+- interrupts:
+    Should contain the I2C interrupt
+
+- clock-frequency:
+    This is the I2C bus clock. Need to be either 100000 or 400000
+
+- #address-cells:
+    Always 1 (for I2C addresses)
+
+- #size-cells:
+    Always 0
+
+Example:
+	i2c0: i2c@18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+
+		codec: wm8750@1a {
+			compatible = "wlf,wm8750";
+			reg = <0x1a>;
+		};
+	};
-- 
1.7.9.5

[PATCH v2 1/4] i2c: iProc: define Broadcom iProc I2C binding

[Ray Jui]

Document the I2C device tree binding for Broadcom iProc family of
SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt

diff --git a/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
new file mode 100644
index 0000000..81f982c
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
@@ -0,0 +1,37 @@
+Broadcom iProc I2C controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,iproc-i2c"
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+    I2C controller registers
+
+- interrupts:
+    Should contain the I2C interrupt
+
+- clock-frequency:
+    This is the I2C bus clock. Need to be either 100000 or 400000
+
+- #address-cells:
+    Always 1 (for I2C addresses)
+
+- #size-cells:
+    Always 0
+
+Example:
+	i2c0: i2c@18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+
+		codec: wm8750@1a {
+			compatible = "wlf,wm8750";
+			reg = <0x1a>;
+		};
+	};
-- 
1.7.9.5

[PATCH v2 1/4] i2c: iProc: define Broadcom iProc I2C binding

[Ray Jui]

Document the I2C device tree binding for Broadcom iProc family of
SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt

diff --git a/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
new file mode 100644
index 0000000..81f982c
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
@@ -0,0 +1,37 @@
+Broadcom iProc I2C controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,iproc-i2c"
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+    I2C controller registers
+
+- interrupts:
+    Should contain the I2C interrupt
+
+- clock-frequency:
+    This is the I2C bus clock. Need to be either 100000 or 400000
+
+- #address-cells:
+    Always 1 (for I2C addresses)
+
+- #size-cells:
+    Always 0
+
+Example:
+	i2c0: i2c at 18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+
+		codec: wm8750 at 1a {
+			compatible = "wlf,wm8750";
+			reg = <0x1a>;
+		};
+	};
-- 
1.7.9.5

[PATCH v2 2/4] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

Add initial support to the Broadcom iProc I2C controller found in the
iProc family of SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has
a size of 64 bytes. The iProc I2C controller supports two bus speeds
including standard mode (100kHz) and fast mode (400kHz)

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/i2c/busses/Kconfig         |    9 +
 drivers/i2c/busses/Makefile        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c |  502 ++++++++++++++++++++++++++++++++++++
 3 files changed, 512 insertions(+)
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index c1351d9..8a2eb7e 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -372,6 +372,15 @@ config I2C_BCM2835
 	  This support is also available as a module.  If so, the module
 	  will be called i2c-bcm2835.
 
+config I2C_BCM_IPROC
+	tristate "Broadcom iProc I2C controller"
+	depends on ARCH_BCM_IPROC
+	help
+	  If you say yes to this option, support will be included for the
+	  Broadcom iProc I2C controller.
+
+	  If you don't know what to do here, say N.
+
 config I2C_BCM_KONA
 	tristate "BCM Kona I2C adapter"
 	depends on ARCH_BCM_MOBILE
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 5e6c822..216e7be 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
 obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
 obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
 obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
+obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
 obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
 obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
 obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
new file mode 100644
index 0000000..57f5f29
--- /dev/null
+++ b/drivers/i2c/busses/i2c-bcm-iproc.c
@@ -0,0 +1,502 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+
+#define CFG_OFFSET                   0x00
+#define CFG_RESET_SHIFT              31
+#define CFG_EN_SHIFT                 30
+#define CFG_M_RETRY_CNT_SHIFT        16
+#define CFG_M_RETRY_CNT_MASK         0x0f
+
+#define TIM_CFG_OFFSET               0x04
+#define TIME_CFG_MODE_400_SHIFT      31
+
+#define M_FIFO_CTRL_OFFSET           0x0c
+#define M_FIFO_RX_FLUSH_SHIFT        31
+#define M_FIFO_TX_FLUSH_SHIFT        30
+#define M_FIFO_RX_CNT_SHIFT          16
+#define M_FIFO_RX_CNT_MASK           0x7f
+#define M_FIFO_RX_THLD_SHIFT         8
+#define M_FIFO_RX_THLD_MASK          0x3f
+
+#define M_CMD_OFFSET                 0x30
+#define M_CMD_START_BUSY_SHIFT       31
+#define M_CMD_STATUS_SHIFT           25
+#define M_CMD_STATUS_MASK            0x07
+#define M_CMD_STATUS_SUCCESS         0x0
+#define M_CMD_STATUS_LOST_ARB        0x1
+#define M_CMD_STATUS_NACK_ADDR       0x2
+#define M_CMD_STATUS_NACK_DATA       0x3
+#define M_CMD_STATUS_TIMEOUT         0x4
+#define M_CMD_PROTOCOL_SHIFT         9
+#define M_CMD_PROTOCOL_MASK          0xf
+#define M_CMD_PROTOCOL_BLK_WR        0x7
+#define M_CMD_PROTOCOL_BLK_RD        0x8
+#define M_CMD_PEC_SHIFT              8
+#define M_CMD_RD_CNT_SHIFT           0
+#define M_CMD_RD_CNT_MASK            0xff
+
+#define IE_OFFSET                    0x38
+#define IE_M_RX_FIFO_FULL_SHIFT      31
+#define IE_M_RX_THLD_SHIFT           30
+#define IE_M_START_BUSY_SHIFT        28
+
+#define IS_OFFSET                    0x3c
+#define IS_M_RX_FIFO_FULL_SHIFT      31
+#define IS_M_RX_THLD_SHIFT           30
+#define IS_M_START_BUSY_SHIFT        28
+
+#define M_TX_OFFSET                  0x40
+#define M_TX_WR_STATUS_SHIFT         31
+#define M_TX_DATA_SHIFT              0
+#define M_TX_DATA_MASK               0xff
+
+#define M_RX_OFFSET                  0x44
+#define M_RX_STATUS_SHIFT            30
+#define M_RX_STATUS_MASK             0x03
+#define M_RX_PEC_ERR_SHIFT           29
+#define M_RX_DATA_SHIFT              0
+#define M_RX_DATA_MASK               0xff
+
+#define I2C_TIMEOUT_MESC             100
+#define M_TX_RX_FIFO_SIZE            64
+
+enum bus_speed_index {
+	I2C_SPD_100K = 0,
+	I2C_SPD_400K,
+};
+
+struct bcm_iproc_i2c_dev {
+	struct device *device;
+
+	void __iomem *base;
+	struct i2c_msg *msg;
+
+	struct i2c_adapter adapter;
+
+	struct completion done;
+};
+
+/*
+ * Can be expanded in the future if more interrupt status bits are utilized
+ */
+#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
+
+static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
+{
+	struct bcm_iproc_i2c_dev *dev = data;
+	u32 status = readl(dev->base + IS_OFFSET);
+
+	status &= ISR_MASK;
+
+	if (!status)
+		return IRQ_NONE;
+
+	writel(status, dev->base + IS_OFFSET);
+	complete_all(&dev->done);
+
+	return IRQ_HANDLED;
+}
+
+static int __wait_for_bus_idle(struct bcm_iproc_i2c_dev *dev)
+{
+	unsigned long timeout = jiffies + msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	while (readl(dev->base + M_CMD_OFFSET) &
+			(1 << M_CMD_START_BUSY_SHIFT)) {
+		if (time_after(jiffies, timeout)) {
+			dev_err(dev->device, "wait for bus idle timeout\n");
+			return -ETIMEDOUT;
+		}
+	}
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *dev,
+				     struct i2c_msg *msg, u8 *addr)
+{
+
+	if (msg->flags & I2C_M_TEN) {
+		dev_err(dev->device, "no support for 10-bit address\n");
+		return -EINVAL;
+	}
+
+	*addr = (msg->addr << 1) & 0xfe;
+
+	if (msg->flags & I2C_M_RD)
+		*addr |= 1;
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	val = readl(dev->base + M_CMD_OFFSET);
+	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
+
+	switch (val) {
+	case M_CMD_STATUS_SUCCESS:
+		return 0;
+
+	case M_CMD_STATUS_LOST_ARB:
+		dev_err(dev->device, "lost bus arbitration\n");
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_NACK_ADDR:
+		dev_err(dev->device, "NAK addr:0x%02x\n", dev->msg->addr);
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_NACK_DATA:
+		dev_err(dev->device, "NAK data\n");
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_TIMEOUT:
+		dev_err(dev->device, "bus timeout\n");
+		return -ETIMEDOUT;
+
+	default:
+		dev_err(dev->device, "unknown error code=%d\n", val);
+		return -EREMOTEIO;
+	}
+
+	return -EREMOTEIO;
+}
+
+static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *dev,
+					 struct i2c_msg *msg)
+{
+	int ret, i;
+	u8 addr;
+	u32 val;
+	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	if (msg->len < 1 || msg->len > M_TX_RX_FIFO_SIZE - 1) {
+		dev_err(dev->device,
+			"supported data length is 1 - %u bytes\n",
+				M_TX_RX_FIFO_SIZE - 1);
+		return -EINVAL;
+	}
+
+	dev->msg = msg;
+	ret = __wait_for_bus_idle(dev);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_format_addr(dev, msg, &addr);
+	if (ret)
+		return ret;
+
+	/* load slave address into the TX FIFO */
+	writel(addr, dev->base + M_TX_OFFSET);
+
+	/* for a write transaction, load data into the TX FIFO */
+	if (!(msg->flags & I2C_M_RD)) {
+		for (i = 0; i < msg->len; i++) {
+			val = msg->buf[i];
+
+			/* mark the last byte */
+			if (i == msg->len - 1)
+				val |= 1 << M_TX_WR_STATUS_SHIFT;
+
+			writel(val, dev->base + M_TX_OFFSET);
+		}
+	}
+
+	/* mark as incomplete before starting the transaction */
+	reinit_completion(&dev->done);
+
+	/*
+	 * Enable the "start busy" interrupt, which will be triggered after
+	 * the transaction is done
+	 */
+	writel(1 << IE_M_START_BUSY_SHIFT, dev->base + IE_OFFSET);
+
+	/*
+	 * Now we can activate the transfer. For a read operation, specify the
+	 * number of bytes to read
+	 */
+	val = 1 << M_CMD_START_BUSY_SHIFT;
+	if (msg->flags & I2C_M_RD) {
+		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
+			(msg->len << M_CMD_RD_CNT_SHIFT);
+	} else {
+		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
+	}
+	writel(val, dev->base + M_CMD_OFFSET);
+
+	time_left = wait_for_completion_timeout(&dev->done, time_left);
+
+	/* disable all interrupts */
+	writel(0, dev->base + IE_OFFSET);
+
+	if (!time_left) {
+		dev_err(dev->device, "transaction times out\n");
+
+		/* flush FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+			(1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, dev->base + M_FIFO_CTRL_OFFSET);
+		return -EREMOTEIO;
+	}
+
+	ret = bcm_iproc_i2c_check_status(dev);
+	if (ret) {
+		/* flush both TX/RX FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+			(1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, dev->base + M_FIFO_CTRL_OFFSET);
+		return ret;
+	}
+
+	/*
+	 * For a read operation, we now need to load the data from FIFO
+	 * into the memory buffer
+	 */
+	if (msg->flags & I2C_M_RD) {
+		for (i = 0; i < msg->len; i++) {
+			msg->buf[i] = (readl(dev->base + M_RX_OFFSET) >>
+					M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
+		}
+	}
+
+	dev_dbg(dev->device, "xfer %c, addr=0x%02x, len=%d\n",
+			(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
+			msg->len);
+	dev_dbg(dev->device, "**** data start ****\n");
+	for (i = 0; i < msg->len; i++)
+		dev_dbg(dev->device, "0x%02x ",  msg->buf[i]);
+	dev_dbg(dev->device, "**** data end ****\n");
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
+			      struct i2c_msg msgs[], int num)
+{
+	struct bcm_iproc_i2c_dev *dev = i2c_get_adapdata(adapter);
+	int ret, i;
+
+	/* go through all messages */
+	for (i = 0; i < num; i++) {
+		ret = bcm_iproc_i2c_xfer_single_msg(dev, &msgs[i]);
+		if (ret) {
+			dev_err(dev->device, "xfer failed\n");
+			return ret;
+		}
+	}
+
+	return num;
+}
+
+static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm bcm_iproc_algo = {
+	.master_xfer = bcm_iproc_i2c_xfer,
+	.functionality = bcm_iproc_i2c_functionality,
+};
+
+static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *dev)
+{
+	unsigned int bus_speed, speed_bit;
+	u32 val;
+	int ret = of_property_read_u32(dev->device->of_node, "clock-frequency",
+				       &bus_speed);
+	if (ret < 0) {
+		dev_err(dev->device, "missing clock-frequency property\n");
+		return -ENODEV;
+	}
+
+	switch (bus_speed) {
+	case 100000:
+		speed_bit = 0;
+		break;
+	case 400000:
+		speed_bit = 1;
+		break;
+	default:
+		dev_err(dev->device, "%d Hz bus speed not supported\n",
+				bus_speed);
+		dev_err(dev->device, "valid speeds are 100khz and 400khz\n");
+		return -EINVAL;
+	}
+
+	val = readl(dev->base + TIM_CFG_OFFSET);
+	val &= ~(1 << TIME_CFG_MODE_400_SHIFT);
+	val |= speed_bit << TIME_CFG_MODE_400_SHIFT;
+	writel(val, dev->base + TIM_CFG_OFFSET);
+
+	dev_info(dev->device, "bus set to %u Hz\n", bus_speed);
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	/* put controller in reset */
+	val = readl(dev->base + CFG_OFFSET);
+	val |= 1 << CFG_RESET_SHIFT;
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, dev->base + CFG_OFFSET);
+
+	/* wait 100 usec per spec */
+	udelay(100);
+
+	/* bring controller out of reset */
+	val = readl(dev->base + CFG_OFFSET);
+	val &= ~(1 << CFG_RESET_SHIFT);
+	writel(val, dev->base + CFG_OFFSET);
+
+	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
+	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
+	writel(val, dev->base + M_FIFO_CTRL_OFFSET);
+
+	/* disable all interrupts */
+	val = 0;
+	writel(val, dev->base + IE_OFFSET);
+
+	/* clear all pending interrupts */
+	val = readl(dev->base + IS_OFFSET);
+	writel(val, dev->base + IS_OFFSET);
+
+	return 0;
+}
+
+static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	val = readl(dev->base + CFG_OFFSET);
+	val |= 1 << CFG_EN_SHIFT;
+	writel(val, dev->base + CFG_OFFSET);
+}
+
+static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	val = readl(dev->base + CFG_OFFSET);
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, dev->base + CFG_OFFSET);
+}
+
+static int bcm_iproc_i2c_probe(struct platform_device *pdev)
+{
+	int irq, ret = 0;
+	struct bcm_iproc_i2c_dev *dev;
+	struct i2c_adapter *adap;
+	struct resource *res;
+
+	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
+	if (!dev)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, dev);
+	dev->device = &pdev->dev;
+	init_completion(&dev->done);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -ENODEV;
+	dev->base = devm_ioremap_resource(dev->device, res);
+	if (IS_ERR(dev->base))
+		return -ENOMEM;
+
+	ret = bcm_iproc_i2c_init(dev);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_cfg_speed(dev);
+	if (ret)
+		return ret;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		dev_err(dev->device, "no irq resource\n");
+		return irq;
+	}
+
+	ret = devm_request_irq(&pdev->dev, irq, bcm_iproc_i2c_isr,
+			IRQF_SHARED, pdev->name, dev);
+	if (ret) {
+		dev_err(dev->device, "unable to request irq %i\n", irq);
+		return ret;
+	}
+
+	bcm_iproc_i2c_enable(dev);
+
+	adap = &dev->adapter;
+	i2c_set_adapdata(adap, dev);
+	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
+	adap->algo = &bcm_iproc_algo;
+	adap->dev.parent = &pdev->dev;
+	adap->dev.of_node = pdev->dev.of_node;
+
+	ret = i2c_add_adapter(adap);
+	if (ret) {
+		dev_err(dev->device, "failed to add adapter\n");
+		return ret;
+	}
+
+	dev_info(dev->device, "device registered successfully\n");
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_remove(struct platform_device *pdev)
+{
+	struct bcm_iproc_i2c_dev *dev = platform_get_drvdata(pdev);
+
+	i2c_del_adapter(&dev->adapter);
+	bcm_iproc_i2c_disable(dev);
+
+	return 0;
+}
+
+static const struct of_device_id bcm_iproc_i2c_of_match[] = {
+	{.compatible = "brcm,iproc-i2c",},
+	{},
+};
+MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
+
+static struct platform_driver bcm_iproc_i2c_driver = {
+	.driver = {
+		   .name = "bcm-iproc-i2c",
+		   .of_match_table = bcm_iproc_i2c_of_match,
+		   },
+	.probe = bcm_iproc_i2c_probe,
+	.remove = bcm_iproc_i2c_remove,
+};
+module_platform_driver(bcm_iproc_i2c_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v2 2/4] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

Add initial support to the Broadcom iProc I2C controller found in the
iProc family of SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has
a size of 64 bytes. The iProc I2C controller supports two bus speeds
including standard mode (100kHz) and fast mode (400kHz)

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/i2c/busses/Kconfig         |    9 +
 drivers/i2c/busses/Makefile        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c |  502 ++++++++++++++++++++++++++++++++++++
 3 files changed, 512 insertions(+)
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index c1351d9..8a2eb7e 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -372,6 +372,15 @@ config I2C_BCM2835
 	  This support is also available as a module.  If so, the module
 	  will be called i2c-bcm2835.
 
+config I2C_BCM_IPROC
+	tristate "Broadcom iProc I2C controller"
+	depends on ARCH_BCM_IPROC
+	help
+	  If you say yes to this option, support will be included for the
+	  Broadcom iProc I2C controller.
+
+	  If you don't know what to do here, say N.
+
 config I2C_BCM_KONA
 	tristate "BCM Kona I2C adapter"
 	depends on ARCH_BCM_MOBILE
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 5e6c822..216e7be 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
 obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
 obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
 obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
+obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
 obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
 obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
 obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
new file mode 100644
index 0000000..57f5f29
--- /dev/null
+++ b/drivers/i2c/busses/i2c-bcm-iproc.c
@@ -0,0 +1,502 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+
+#define CFG_OFFSET                   0x00
+#define CFG_RESET_SHIFT              31
+#define CFG_EN_SHIFT                 30
+#define CFG_M_RETRY_CNT_SHIFT        16
+#define CFG_M_RETRY_CNT_MASK         0x0f
+
+#define TIM_CFG_OFFSET               0x04
+#define TIME_CFG_MODE_400_SHIFT      31
+
+#define M_FIFO_CTRL_OFFSET           0x0c
+#define M_FIFO_RX_FLUSH_SHIFT        31
+#define M_FIFO_TX_FLUSH_SHIFT        30
+#define M_FIFO_RX_CNT_SHIFT          16
+#define M_FIFO_RX_CNT_MASK           0x7f
+#define M_FIFO_RX_THLD_SHIFT         8
+#define M_FIFO_RX_THLD_MASK          0x3f
+
+#define M_CMD_OFFSET                 0x30
+#define M_CMD_START_BUSY_SHIFT       31
+#define M_CMD_STATUS_SHIFT           25
+#define M_CMD_STATUS_MASK            0x07
+#define M_CMD_STATUS_SUCCESS         0x0
+#define M_CMD_STATUS_LOST_ARB        0x1
+#define M_CMD_STATUS_NACK_ADDR       0x2
+#define M_CMD_STATUS_NACK_DATA       0x3
+#define M_CMD_STATUS_TIMEOUT         0x4
+#define M_CMD_PROTOCOL_SHIFT         9
+#define M_CMD_PROTOCOL_MASK          0xf
+#define M_CMD_PROTOCOL_BLK_WR        0x7
+#define M_CMD_PROTOCOL_BLK_RD        0x8
+#define M_CMD_PEC_SHIFT              8
+#define M_CMD_RD_CNT_SHIFT           0
+#define M_CMD_RD_CNT_MASK            0xff
+
+#define IE_OFFSET                    0x38
+#define IE_M_RX_FIFO_FULL_SHIFT      31
+#define IE_M_RX_THLD_SHIFT           30
+#define IE_M_START_BUSY_SHIFT        28
+
+#define IS_OFFSET                    0x3c
+#define IS_M_RX_FIFO_FULL_SHIFT      31
+#define IS_M_RX_THLD_SHIFT           30
+#define IS_M_START_BUSY_SHIFT        28
+
+#define M_TX_OFFSET                  0x40
+#define M_TX_WR_STATUS_SHIFT         31
+#define M_TX_DATA_SHIFT              0
+#define M_TX_DATA_MASK               0xff
+
+#define M_RX_OFFSET                  0x44
+#define M_RX_STATUS_SHIFT            30
+#define M_RX_STATUS_MASK             0x03
+#define M_RX_PEC_ERR_SHIFT           29
+#define M_RX_DATA_SHIFT              0
+#define M_RX_DATA_MASK               0xff
+
+#define I2C_TIMEOUT_MESC             100
+#define M_TX_RX_FIFO_SIZE            64
+
+enum bus_speed_index {
+	I2C_SPD_100K = 0,
+	I2C_SPD_400K,
+};
+
+struct bcm_iproc_i2c_dev {
+	struct device *device;
+
+	void __iomem *base;
+	struct i2c_msg *msg;
+
+	struct i2c_adapter adapter;
+
+	struct completion done;
+};
+
+/*
+ * Can be expanded in the future if more interrupt status bits are utilized
+ */
+#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
+
+static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
+{
+	struct bcm_iproc_i2c_dev *dev = data;
+	u32 status = readl(dev->base + IS_OFFSET);
+
+	status &= ISR_MASK;
+
+	if (!status)
+		return IRQ_NONE;
+
+	writel(status, dev->base + IS_OFFSET);
+	complete_all(&dev->done);
+
+	return IRQ_HANDLED;
+}
+
+static int __wait_for_bus_idle(struct bcm_iproc_i2c_dev *dev)
+{
+	unsigned long timeout = jiffies + msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	while (readl(dev->base + M_CMD_OFFSET) &
+			(1 << M_CMD_START_BUSY_SHIFT)) {
+		if (time_after(jiffies, timeout)) {
+			dev_err(dev->device, "wait for bus idle timeout\n");
+			return -ETIMEDOUT;
+		}
+	}
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *dev,
+				     struct i2c_msg *msg, u8 *addr)
+{
+
+	if (msg->flags & I2C_M_TEN) {
+		dev_err(dev->device, "no support for 10-bit address\n");
+		return -EINVAL;
+	}
+
+	*addr = (msg->addr << 1) & 0xfe;
+
+	if (msg->flags & I2C_M_RD)
+		*addr |= 1;
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	val = readl(dev->base + M_CMD_OFFSET);
+	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
+
+	switch (val) {
+	case M_CMD_STATUS_SUCCESS:
+		return 0;
+
+	case M_CMD_STATUS_LOST_ARB:
+		dev_err(dev->device, "lost bus arbitration\n");
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_NACK_ADDR:
+		dev_err(dev->device, "NAK addr:0x%02x\n", dev->msg->addr);
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_NACK_DATA:
+		dev_err(dev->device, "NAK data\n");
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_TIMEOUT:
+		dev_err(dev->device, "bus timeout\n");
+		return -ETIMEDOUT;
+
+	default:
+		dev_err(dev->device, "unknown error code=%d\n", val);
+		return -EREMOTEIO;
+	}
+
+	return -EREMOTEIO;
+}
+
+static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *dev,
+					 struct i2c_msg *msg)
+{
+	int ret, i;
+	u8 addr;
+	u32 val;
+	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	if (msg->len < 1 || msg->len > M_TX_RX_FIFO_SIZE - 1) {
+		dev_err(dev->device,
+			"supported data length is 1 - %u bytes\n",
+				M_TX_RX_FIFO_SIZE - 1);
+		return -EINVAL;
+	}
+
+	dev->msg = msg;
+	ret = __wait_for_bus_idle(dev);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_format_addr(dev, msg, &addr);
+	if (ret)
+		return ret;
+
+	/* load slave address into the TX FIFO */
+	writel(addr, dev->base + M_TX_OFFSET);
+
+	/* for a write transaction, load data into the TX FIFO */
+	if (!(msg->flags & I2C_M_RD)) {
+		for (i = 0; i < msg->len; i++) {
+			val = msg->buf[i];
+
+			/* mark the last byte */
+			if (i == msg->len - 1)
+				val |= 1 << M_TX_WR_STATUS_SHIFT;
+
+			writel(val, dev->base + M_TX_OFFSET);
+		}
+	}
+
+	/* mark as incomplete before starting the transaction */
+	reinit_completion(&dev->done);
+
+	/*
+	 * Enable the "start busy" interrupt, which will be triggered after
+	 * the transaction is done
+	 */
+	writel(1 << IE_M_START_BUSY_SHIFT, dev->base + IE_OFFSET);
+
+	/*
+	 * Now we can activate the transfer. For a read operation, specify the
+	 * number of bytes to read
+	 */
+	val = 1 << M_CMD_START_BUSY_SHIFT;
+	if (msg->flags & I2C_M_RD) {
+		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
+			(msg->len << M_CMD_RD_CNT_SHIFT);
+	} else {
+		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
+	}
+	writel(val, dev->base + M_CMD_OFFSET);
+
+	time_left = wait_for_completion_timeout(&dev->done, time_left);
+
+	/* disable all interrupts */
+	writel(0, dev->base + IE_OFFSET);
+
+	if (!time_left) {
+		dev_err(dev->device, "transaction times out\n");
+
+		/* flush FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+			(1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, dev->base + M_FIFO_CTRL_OFFSET);
+		return -EREMOTEIO;
+	}
+
+	ret = bcm_iproc_i2c_check_status(dev);
+	if (ret) {
+		/* flush both TX/RX FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+			(1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, dev->base + M_FIFO_CTRL_OFFSET);
+		return ret;
+	}
+
+	/*
+	 * For a read operation, we now need to load the data from FIFO
+	 * into the memory buffer
+	 */
+	if (msg->flags & I2C_M_RD) {
+		for (i = 0; i < msg->len; i++) {
+			msg->buf[i] = (readl(dev->base + M_RX_OFFSET) >>
+					M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
+		}
+	}
+
+	dev_dbg(dev->device, "xfer %c, addr=0x%02x, len=%d\n",
+			(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
+			msg->len);
+	dev_dbg(dev->device, "**** data start ****\n");
+	for (i = 0; i < msg->len; i++)
+		dev_dbg(dev->device, "0x%02x ",  msg->buf[i]);
+	dev_dbg(dev->device, "**** data end ****\n");
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
+			      struct i2c_msg msgs[], int num)
+{
+	struct bcm_iproc_i2c_dev *dev = i2c_get_adapdata(adapter);
+	int ret, i;
+
+	/* go through all messages */
+	for (i = 0; i < num; i++) {
+		ret = bcm_iproc_i2c_xfer_single_msg(dev, &msgs[i]);
+		if (ret) {
+			dev_err(dev->device, "xfer failed\n");
+			return ret;
+		}
+	}
+
+	return num;
+}
+
+static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm bcm_iproc_algo = {
+	.master_xfer = bcm_iproc_i2c_xfer,
+	.functionality = bcm_iproc_i2c_functionality,
+};
+
+static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *dev)
+{
+	unsigned int bus_speed, speed_bit;
+	u32 val;
+	int ret = of_property_read_u32(dev->device->of_node, "clock-frequency",
+				       &bus_speed);
+	if (ret < 0) {
+		dev_err(dev->device, "missing clock-frequency property\n");
+		return -ENODEV;
+	}
+
+	switch (bus_speed) {
+	case 100000:
+		speed_bit = 0;
+		break;
+	case 400000:
+		speed_bit = 1;
+		break;
+	default:
+		dev_err(dev->device, "%d Hz bus speed not supported\n",
+				bus_speed);
+		dev_err(dev->device, "valid speeds are 100khz and 400khz\n");
+		return -EINVAL;
+	}
+
+	val = readl(dev->base + TIM_CFG_OFFSET);
+	val &= ~(1 << TIME_CFG_MODE_400_SHIFT);
+	val |= speed_bit << TIME_CFG_MODE_400_SHIFT;
+	writel(val, dev->base + TIM_CFG_OFFSET);
+
+	dev_info(dev->device, "bus set to %u Hz\n", bus_speed);
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	/* put controller in reset */
+	val = readl(dev->base + CFG_OFFSET);
+	val |= 1 << CFG_RESET_SHIFT;
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, dev->base + CFG_OFFSET);
+
+	/* wait 100 usec per spec */
+	udelay(100);
+
+	/* bring controller out of reset */
+	val = readl(dev->base + CFG_OFFSET);
+	val &= ~(1 << CFG_RESET_SHIFT);
+	writel(val, dev->base + CFG_OFFSET);
+
+	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
+	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
+	writel(val, dev->base + M_FIFO_CTRL_OFFSET);
+
+	/* disable all interrupts */
+	val = 0;
+	writel(val, dev->base + IE_OFFSET);
+
+	/* clear all pending interrupts */
+	val = readl(dev->base + IS_OFFSET);
+	writel(val, dev->base + IS_OFFSET);
+
+	return 0;
+}
+
+static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	val = readl(dev->base + CFG_OFFSET);
+	val |= 1 << CFG_EN_SHIFT;
+	writel(val, dev->base + CFG_OFFSET);
+}
+
+static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	val = readl(dev->base + CFG_OFFSET);
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, dev->base + CFG_OFFSET);
+}
+
+static int bcm_iproc_i2c_probe(struct platform_device *pdev)
+{
+	int irq, ret = 0;
+	struct bcm_iproc_i2c_dev *dev;
+	struct i2c_adapter *adap;
+	struct resource *res;
+
+	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
+	if (!dev)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, dev);
+	dev->device = &pdev->dev;
+	init_completion(&dev->done);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -ENODEV;
+	dev->base = devm_ioremap_resource(dev->device, res);
+	if (IS_ERR(dev->base))
+		return -ENOMEM;
+
+	ret = bcm_iproc_i2c_init(dev);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_cfg_speed(dev);
+	if (ret)
+		return ret;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		dev_err(dev->device, "no irq resource\n");
+		return irq;
+	}
+
+	ret = devm_request_irq(&pdev->dev, irq, bcm_iproc_i2c_isr,
+			IRQF_SHARED, pdev->name, dev);
+	if (ret) {
+		dev_err(dev->device, "unable to request irq %i\n", irq);
+		return ret;
+	}
+
+	bcm_iproc_i2c_enable(dev);
+
+	adap = &dev->adapter;
+	i2c_set_adapdata(adap, dev);
+	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
+	adap->algo = &bcm_iproc_algo;
+	adap->dev.parent = &pdev->dev;
+	adap->dev.of_node = pdev->dev.of_node;
+
+	ret = i2c_add_adapter(adap);
+	if (ret) {
+		dev_err(dev->device, "failed to add adapter\n");
+		return ret;
+	}
+
+	dev_info(dev->device, "device registered successfully\n");
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_remove(struct platform_device *pdev)
+{
+	struct bcm_iproc_i2c_dev *dev = platform_get_drvdata(pdev);
+
+	i2c_del_adapter(&dev->adapter);
+	bcm_iproc_i2c_disable(dev);
+
+	return 0;
+}
+
+static const struct of_device_id bcm_iproc_i2c_of_match[] = {
+	{.compatible = "brcm,iproc-i2c",},
+	{},
+};
+MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
+
+static struct platform_driver bcm_iproc_i2c_driver = {
+	.driver = {
+		   .name = "bcm-iproc-i2c",
+		   .of_match_table = bcm_iproc_i2c_of_match,
+		   },
+	.probe = bcm_iproc_i2c_probe,
+	.remove = bcm_iproc_i2c_remove,
+};
+module_platform_driver(bcm_iproc_i2c_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v2 2/4] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

Add initial support to the Broadcom iProc I2C controller found in the
iProc family of SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has
a size of 64 bytes. The iProc I2C controller supports two bus speeds
including standard mode (100kHz) and fast mode (400kHz)

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/i2c/busses/Kconfig         |    9 +
 drivers/i2c/busses/Makefile        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c |  502 ++++++++++++++++++++++++++++++++++++
 3 files changed, 512 insertions(+)
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index c1351d9..8a2eb7e 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -372,6 +372,15 @@ config I2C_BCM2835
 	  This support is also available as a module.  If so, the module
 	  will be called i2c-bcm2835.
 
+config I2C_BCM_IPROC
+	tristate "Broadcom iProc I2C controller"
+	depends on ARCH_BCM_IPROC
+	help
+	  If you say yes to this option, support will be included for the
+	  Broadcom iProc I2C controller.
+
+	  If you don't know what to do here, say N.
+
 config I2C_BCM_KONA
 	tristate "BCM Kona I2C adapter"
 	depends on ARCH_BCM_MOBILE
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 5e6c822..216e7be 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
 obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
 obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
 obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
+obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
 obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
 obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
 obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
new file mode 100644
index 0000000..57f5f29
--- /dev/null
+++ b/drivers/i2c/busses/i2c-bcm-iproc.c
@@ -0,0 +1,502 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+
+#define CFG_OFFSET                   0x00
+#define CFG_RESET_SHIFT              31
+#define CFG_EN_SHIFT                 30
+#define CFG_M_RETRY_CNT_SHIFT        16
+#define CFG_M_RETRY_CNT_MASK         0x0f
+
+#define TIM_CFG_OFFSET               0x04
+#define TIME_CFG_MODE_400_SHIFT      31
+
+#define M_FIFO_CTRL_OFFSET           0x0c
+#define M_FIFO_RX_FLUSH_SHIFT        31
+#define M_FIFO_TX_FLUSH_SHIFT        30
+#define M_FIFO_RX_CNT_SHIFT          16
+#define M_FIFO_RX_CNT_MASK           0x7f
+#define M_FIFO_RX_THLD_SHIFT         8
+#define M_FIFO_RX_THLD_MASK          0x3f
+
+#define M_CMD_OFFSET                 0x30
+#define M_CMD_START_BUSY_SHIFT       31
+#define M_CMD_STATUS_SHIFT           25
+#define M_CMD_STATUS_MASK            0x07
+#define M_CMD_STATUS_SUCCESS         0x0
+#define M_CMD_STATUS_LOST_ARB        0x1
+#define M_CMD_STATUS_NACK_ADDR       0x2
+#define M_CMD_STATUS_NACK_DATA       0x3
+#define M_CMD_STATUS_TIMEOUT         0x4
+#define M_CMD_PROTOCOL_SHIFT         9
+#define M_CMD_PROTOCOL_MASK          0xf
+#define M_CMD_PROTOCOL_BLK_WR        0x7
+#define M_CMD_PROTOCOL_BLK_RD        0x8
+#define M_CMD_PEC_SHIFT              8
+#define M_CMD_RD_CNT_SHIFT           0
+#define M_CMD_RD_CNT_MASK            0xff
+
+#define IE_OFFSET                    0x38
+#define IE_M_RX_FIFO_FULL_SHIFT      31
+#define IE_M_RX_THLD_SHIFT           30
+#define IE_M_START_BUSY_SHIFT        28
+
+#define IS_OFFSET                    0x3c
+#define IS_M_RX_FIFO_FULL_SHIFT      31
+#define IS_M_RX_THLD_SHIFT           30
+#define IS_M_START_BUSY_SHIFT        28
+
+#define M_TX_OFFSET                  0x40
+#define M_TX_WR_STATUS_SHIFT         31
+#define M_TX_DATA_SHIFT              0
+#define M_TX_DATA_MASK               0xff
+
+#define M_RX_OFFSET                  0x44
+#define M_RX_STATUS_SHIFT            30
+#define M_RX_STATUS_MASK             0x03
+#define M_RX_PEC_ERR_SHIFT           29
+#define M_RX_DATA_SHIFT              0
+#define M_RX_DATA_MASK               0xff
+
+#define I2C_TIMEOUT_MESC             100
+#define M_TX_RX_FIFO_SIZE            64
+
+enum bus_speed_index {
+	I2C_SPD_100K = 0,
+	I2C_SPD_400K,
+};
+
+struct bcm_iproc_i2c_dev {
+	struct device *device;
+
+	void __iomem *base;
+	struct i2c_msg *msg;
+
+	struct i2c_adapter adapter;
+
+	struct completion done;
+};
+
+/*
+ * Can be expanded in the future if more interrupt status bits are utilized
+ */
+#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
+
+static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
+{
+	struct bcm_iproc_i2c_dev *dev = data;
+	u32 status = readl(dev->base + IS_OFFSET);
+
+	status &= ISR_MASK;
+
+	if (!status)
+		return IRQ_NONE;
+
+	writel(status, dev->base + IS_OFFSET);
+	complete_all(&dev->done);
+
+	return IRQ_HANDLED;
+}
+
+static int __wait_for_bus_idle(struct bcm_iproc_i2c_dev *dev)
+{
+	unsigned long timeout = jiffies + msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	while (readl(dev->base + M_CMD_OFFSET) &
+			(1 << M_CMD_START_BUSY_SHIFT)) {
+		if (time_after(jiffies, timeout)) {
+			dev_err(dev->device, "wait for bus idle timeout\n");
+			return -ETIMEDOUT;
+		}
+	}
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *dev,
+				     struct i2c_msg *msg, u8 *addr)
+{
+
+	if (msg->flags & I2C_M_TEN) {
+		dev_err(dev->device, "no support for 10-bit address\n");
+		return -EINVAL;
+	}
+
+	*addr = (msg->addr << 1) & 0xfe;
+
+	if (msg->flags & I2C_M_RD)
+		*addr |= 1;
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	val = readl(dev->base + M_CMD_OFFSET);
+	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
+
+	switch (val) {
+	case M_CMD_STATUS_SUCCESS:
+		return 0;
+
+	case M_CMD_STATUS_LOST_ARB:
+		dev_err(dev->device, "lost bus arbitration\n");
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_NACK_ADDR:
+		dev_err(dev->device, "NAK addr:0x%02x\n", dev->msg->addr);
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_NACK_DATA:
+		dev_err(dev->device, "NAK data\n");
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_TIMEOUT:
+		dev_err(dev->device, "bus timeout\n");
+		return -ETIMEDOUT;
+
+	default:
+		dev_err(dev->device, "unknown error code=%d\n", val);
+		return -EREMOTEIO;
+	}
+
+	return -EREMOTEIO;
+}
+
+static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *dev,
+					 struct i2c_msg *msg)
+{
+	int ret, i;
+	u8 addr;
+	u32 val;
+	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	if (msg->len < 1 || msg->len > M_TX_RX_FIFO_SIZE - 1) {
+		dev_err(dev->device,
+			"supported data length is 1 - %u bytes\n",
+				M_TX_RX_FIFO_SIZE - 1);
+		return -EINVAL;
+	}
+
+	dev->msg = msg;
+	ret = __wait_for_bus_idle(dev);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_format_addr(dev, msg, &addr);
+	if (ret)
+		return ret;
+
+	/* load slave address into the TX FIFO */
+	writel(addr, dev->base + M_TX_OFFSET);
+
+	/* for a write transaction, load data into the TX FIFO */
+	if (!(msg->flags & I2C_M_RD)) {
+		for (i = 0; i < msg->len; i++) {
+			val = msg->buf[i];
+
+			/* mark the last byte */
+			if (i == msg->len - 1)
+				val |= 1 << M_TX_WR_STATUS_SHIFT;
+
+			writel(val, dev->base + M_TX_OFFSET);
+		}
+	}
+
+	/* mark as incomplete before starting the transaction */
+	reinit_completion(&dev->done);
+
+	/*
+	 * Enable the "start busy" interrupt, which will be triggered after
+	 * the transaction is done
+	 */
+	writel(1 << IE_M_START_BUSY_SHIFT, dev->base + IE_OFFSET);
+
+	/*
+	 * Now we can activate the transfer. For a read operation, specify the
+	 * number of bytes to read
+	 */
+	val = 1 << M_CMD_START_BUSY_SHIFT;
+	if (msg->flags & I2C_M_RD) {
+		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
+			(msg->len << M_CMD_RD_CNT_SHIFT);
+	} else {
+		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
+	}
+	writel(val, dev->base + M_CMD_OFFSET);
+
+	time_left = wait_for_completion_timeout(&dev->done, time_left);
+
+	/* disable all interrupts */
+	writel(0, dev->base + IE_OFFSET);
+
+	if (!time_left) {
+		dev_err(dev->device, "transaction times out\n");
+
+		/* flush FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+			(1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, dev->base + M_FIFO_CTRL_OFFSET);
+		return -EREMOTEIO;
+	}
+
+	ret = bcm_iproc_i2c_check_status(dev);
+	if (ret) {
+		/* flush both TX/RX FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+			(1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, dev->base + M_FIFO_CTRL_OFFSET);
+		return ret;
+	}
+
+	/*
+	 * For a read operation, we now need to load the data from FIFO
+	 * into the memory buffer
+	 */
+	if (msg->flags & I2C_M_RD) {
+		for (i = 0; i < msg->len; i++) {
+			msg->buf[i] = (readl(dev->base + M_RX_OFFSET) >>
+					M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
+		}
+	}
+
+	dev_dbg(dev->device, "xfer %c, addr=0x%02x, len=%d\n",
+			(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
+			msg->len);
+	dev_dbg(dev->device, "**** data start ****\n");
+	for (i = 0; i < msg->len; i++)
+		dev_dbg(dev->device, "0x%02x ",  msg->buf[i]);
+	dev_dbg(dev->device, "**** data end ****\n");
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
+			      struct i2c_msg msgs[], int num)
+{
+	struct bcm_iproc_i2c_dev *dev = i2c_get_adapdata(adapter);
+	int ret, i;
+
+	/* go through all messages */
+	for (i = 0; i < num; i++) {
+		ret = bcm_iproc_i2c_xfer_single_msg(dev, &msgs[i]);
+		if (ret) {
+			dev_err(dev->device, "xfer failed\n");
+			return ret;
+		}
+	}
+
+	return num;
+}
+
+static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm bcm_iproc_algo = {
+	.master_xfer = bcm_iproc_i2c_xfer,
+	.functionality = bcm_iproc_i2c_functionality,
+};
+
+static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *dev)
+{
+	unsigned int bus_speed, speed_bit;
+	u32 val;
+	int ret = of_property_read_u32(dev->device->of_node, "clock-frequency",
+				       &bus_speed);
+	if (ret < 0) {
+		dev_err(dev->device, "missing clock-frequency property\n");
+		return -ENODEV;
+	}
+
+	switch (bus_speed) {
+	case 100000:
+		speed_bit = 0;
+		break;
+	case 400000:
+		speed_bit = 1;
+		break;
+	default:
+		dev_err(dev->device, "%d Hz bus speed not supported\n",
+				bus_speed);
+		dev_err(dev->device, "valid speeds are 100khz and 400khz\n");
+		return -EINVAL;
+	}
+
+	val = readl(dev->base + TIM_CFG_OFFSET);
+	val &= ~(1 << TIME_CFG_MODE_400_SHIFT);
+	val |= speed_bit << TIME_CFG_MODE_400_SHIFT;
+	writel(val, dev->base + TIM_CFG_OFFSET);
+
+	dev_info(dev->device, "bus set to %u Hz\n", bus_speed);
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	/* put controller in reset */
+	val = readl(dev->base + CFG_OFFSET);
+	val |= 1 << CFG_RESET_SHIFT;
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, dev->base + CFG_OFFSET);
+
+	/* wait 100 usec per spec */
+	udelay(100);
+
+	/* bring controller out of reset */
+	val = readl(dev->base + CFG_OFFSET);
+	val &= ~(1 << CFG_RESET_SHIFT);
+	writel(val, dev->base + CFG_OFFSET);
+
+	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
+	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
+	writel(val, dev->base + M_FIFO_CTRL_OFFSET);
+
+	/* disable all interrupts */
+	val = 0;
+	writel(val, dev->base + IE_OFFSET);
+
+	/* clear all pending interrupts */
+	val = readl(dev->base + IS_OFFSET);
+	writel(val, dev->base + IS_OFFSET);
+
+	return 0;
+}
+
+static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	val = readl(dev->base + CFG_OFFSET);
+	val |= 1 << CFG_EN_SHIFT;
+	writel(val, dev->base + CFG_OFFSET);
+}
+
+static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	val = readl(dev->base + CFG_OFFSET);
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, dev->base + CFG_OFFSET);
+}
+
+static int bcm_iproc_i2c_probe(struct platform_device *pdev)
+{
+	int irq, ret = 0;
+	struct bcm_iproc_i2c_dev *dev;
+	struct i2c_adapter *adap;
+	struct resource *res;
+
+	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
+	if (!dev)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, dev);
+	dev->device = &pdev->dev;
+	init_completion(&dev->done);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -ENODEV;
+	dev->base = devm_ioremap_resource(dev->device, res);
+	if (IS_ERR(dev->base))
+		return -ENOMEM;
+
+	ret = bcm_iproc_i2c_init(dev);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_cfg_speed(dev);
+	if (ret)
+		return ret;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		dev_err(dev->device, "no irq resource\n");
+		return irq;
+	}
+
+	ret = devm_request_irq(&pdev->dev, irq, bcm_iproc_i2c_isr,
+			IRQF_SHARED, pdev->name, dev);
+	if (ret) {
+		dev_err(dev->device, "unable to request irq %i\n", irq);
+		return ret;
+	}
+
+	bcm_iproc_i2c_enable(dev);
+
+	adap = &dev->adapter;
+	i2c_set_adapdata(adap, dev);
+	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
+	adap->algo = &bcm_iproc_algo;
+	adap->dev.parent = &pdev->dev;
+	adap->dev.of_node = pdev->dev.of_node;
+
+	ret = i2c_add_adapter(adap);
+	if (ret) {
+		dev_err(dev->device, "failed to add adapter\n");
+		return ret;
+	}
+
+	dev_info(dev->device, "device registered successfully\n");
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_remove(struct platform_device *pdev)
+{
+	struct bcm_iproc_i2c_dev *dev = platform_get_drvdata(pdev);
+
+	i2c_del_adapter(&dev->adapter);
+	bcm_iproc_i2c_disable(dev);
+
+	return 0;
+}
+
+static const struct of_device_id bcm_iproc_i2c_of_match[] = {
+	{.compatible = "brcm,iproc-i2c",},
+	{},
+};
+MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
+
+static struct platform_driver bcm_iproc_i2c_driver = {
+	.driver = {
+		   .name = "bcm-iproc-i2c",
+		   .of_match_table = bcm_iproc_i2c_of_match,
+		   },
+	.probe = bcm_iproc_i2c_probe,
+	.remove = bcm_iproc_i2c_remove,
+};
+module_platform_driver(bcm_iproc_i2c_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v2 3/4] ARM: mach-bcm: Enable I2C support for iProc

[Ray Jui]

Enable I2C driver support for Broadcom iProc family of SoCs by
selecting I2C_BCM_IPROC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/mach-bcm/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index aaeec78..86ee90b 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -19,6 +19,7 @@ config ARCH_BCM_IPROC
 	select ARCH_REQUIRE_GPIOLIB
 	select ARM_AMBA
 	select PINCTRL
+	select I2C_BCM_IPROC
 	help
 	  This enables support for systems based on Broadcom IPROC architected SoCs.
 	  The IPROC complex contains one or more ARM CPUs along with common
-- 
1.7.9.5

[PATCH v2 3/4] ARM: mach-bcm: Enable I2C support for iProc

[Ray Jui]

Enable I2C driver support for Broadcom iProc family of SoCs by
selecting I2C_BCM_IPROC

Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
---
 arch/arm/mach-bcm/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index aaeec78..86ee90b 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -19,6 +19,7 @@ config ARCH_BCM_IPROC
 	select ARCH_REQUIRE_GPIOLIB
 	select ARM_AMBA
 	select PINCTRL
+	select I2C_BCM_IPROC
 	help
 	  This enables support for systems based on Broadcom IPROC architected SoCs.
 	  The IPROC complex contains one or more ARM CPUs along with common
-- 
1.7.9.5

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[PATCH v2 3/4] ARM: mach-bcm: Enable I2C support for iProc

[Ray Jui]

Enable I2C driver support for Broadcom iProc family of SoCs by
selecting I2C_BCM_IPROC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/mach-bcm/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index aaeec78..86ee90b 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -19,6 +19,7 @@ config ARCH_BCM_IPROC
 	select ARCH_REQUIRE_GPIOLIB
 	select ARM_AMBA
 	select PINCTRL
+	select I2C_BCM_IPROC
 	help
 	  This enables support for systems based on Broadcom IPROC architected SoCs.
 	  The IPROC complex contains one or more ARM CPUs along with common
-- 
1.7.9.5

[PATCH v2 4/4] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
them disabled there. Individual I2C devices can be enabled in board
specific dts file when I2C slave devices are enabled in the future

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..f7d6c1d 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -70,6 +70,26 @@
 		};
 	};
 
+	i2c0: i2c@18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
+	i2c1: i2c@1800b000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x1800b000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 86 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
 	uart0: serial@18020000 {
 		compatible = "snps,dw-apb-uart";
 		reg = <0x18020000 0x100>;
-- 
1.7.9.5

[PATCH v2 4/4] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
them disabled there. Individual I2C devices can be enabled in board
specific dts file when I2C slave devices are enabled in the future

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..f7d6c1d 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -70,6 +70,26 @@
 		};
 	};
 
+	i2c0: i2c@18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
+	i2c1: i2c@1800b000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x1800b000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 86 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
 	uart0: serial@18020000 {
 		compatible = "snps,dw-apb-uart";
 		reg = <0x18020000 0x100>;
-- 
1.7.9.5

[PATCH v2 4/4] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
them disabled there. Individual I2C devices can be enabled in board
specific dts file when I2C slave devices are enabled in the future

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..f7d6c1d 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -70,6 +70,26 @@
 		};
 	};
 
+	i2c0: i2c at 18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
+	i2c1: i2c at 1800b000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x1800b000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 86 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
 	uart0: serial at 18020000 {
 		compatible = "snps,dw-apb-uart";
 		reg = <0x18020000 0x100>;
-- 
1.7.9.5

Re: [PATCH v2 3/4] ARM: mach-bcm: Enable I2C support for iProc

[Florian Fainelli]

On 09/12/14 18:18, Ray Jui wrote:
> Enable I2C driver support for Broadcom iProc family of SoCs by
> selecting I2C_BCM_IPROC
> 
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> ---
>  arch/arm/mach-bcm/Kconfig |    1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
> index aaeec78..86ee90b 100644
> --- a/arch/arm/mach-bcm/Kconfig
> +++ b/arch/arm/mach-bcm/Kconfig
> @@ -19,6 +19,7 @@ config ARCH_BCM_IPROC
>  	select ARCH_REQUIRE_GPIOLIB
>  	select ARM_AMBA
>  	select PINCTRL
> +	select I2C_BCM_IPROC

One way to avoid having to modify mach-bcm/Kconfig would be to have your
i2c driver Kconfig do this:

default ARCH_BCM_IPROC

would that work?

>  	help
>  	  This enables support for systems based on Broadcom IPROC architected SoCs.
>  	  The IPROC complex contains one or more ARM CPUs along with common
> 

Re: [PATCH v2 3/4] ARM: mach-bcm: Enable I2C support for iProc

[Florian Fainelli]

On 09/12/14 18:18, Ray Jui wrote:
> Enable I2C driver support for Broadcom iProc family of SoCs by
> selecting I2C_BCM_IPROC
> 
> Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
> Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
> ---
>  arch/arm/mach-bcm/Kconfig |    1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
> index aaeec78..86ee90b 100644
> --- a/arch/arm/mach-bcm/Kconfig
> +++ b/arch/arm/mach-bcm/Kconfig
> @@ -19,6 +19,7 @@ config ARCH_BCM_IPROC
>  	select ARCH_REQUIRE_GPIOLIB
>  	select ARM_AMBA
>  	select PINCTRL
> +	select I2C_BCM_IPROC

One way to avoid having to modify mach-bcm/Kconfig would be to have your
i2c driver Kconfig do this:

default ARCH_BCM_IPROC

would that work?

>  	help
>  	  This enables support for systems based on Broadcom IPROC architected SoCs.
>  	  The IPROC complex contains one or more ARM CPUs along with common
> 

[PATCH v2 3/4] ARM: mach-bcm: Enable I2C support for iProc

[Florian Fainelli]

On 09/12/14 18:18, Ray Jui wrote:
> Enable I2C driver support for Broadcom iProc family of SoCs by
> selecting I2C_BCM_IPROC
> 
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> ---
>  arch/arm/mach-bcm/Kconfig |    1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
> index aaeec78..86ee90b 100644
> --- a/arch/arm/mach-bcm/Kconfig
> +++ b/arch/arm/mach-bcm/Kconfig
> @@ -19,6 +19,7 @@ config ARCH_BCM_IPROC
>  	select ARCH_REQUIRE_GPIOLIB
>  	select ARM_AMBA
>  	select PINCTRL
> +	select I2C_BCM_IPROC

One way to avoid having to modify mach-bcm/Kconfig would be to have your
i2c driver Kconfig do this:

default ARCH_BCM_IPROC

would that work?

>  	help
>  	  This enables support for systems based on Broadcom IPROC architected SoCs.
>  	  The IPROC complex contains one or more ARM CPUs along with common
> 

Re: [PATCH v2 3/4] ARM: mach-bcm: Enable I2C support for iProc

[Ray Jui]

On 12/9/2014 6:20 PM, Florian Fainelli wrote:
> On 09/12/14 18:18, Ray Jui wrote:
>> Enable I2C driver support for Broadcom iProc family of SoCs by
>> selecting I2C_BCM_IPROC
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>> ---
>>   arch/arm/mach-bcm/Kconfig |    1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
>> index aaeec78..86ee90b 100644
>> --- a/arch/arm/mach-bcm/Kconfig
>> +++ b/arch/arm/mach-bcm/Kconfig
>> @@ -19,6 +19,7 @@ config ARCH_BCM_IPROC
>>   	select ARCH_REQUIRE_GPIOLIB
>>   	select ARM_AMBA
>>   	select PINCTRL
>> +	select I2C_BCM_IPROC
>
> One way to avoid having to modify mach-bcm/Kconfig would be to have your
> i2c driver Kconfig do this:
>
> default ARCH_BCM_IPROC
>
> would that work?
>
Yes. So in which case it is better to select a driver from the 
architecture specific Kconfig?

>>   	help
>>   	  This enables support for systems based on Broadcom IPROC architected SoCs.
>>   	  The IPROC complex contains one or more ARM CPUs along with common
>>
>

Re: [PATCH v2 3/4] ARM: mach-bcm: Enable I2C support for iProc

[Ray Jui]

On 12/9/2014 6:20 PM, Florian Fainelli wrote:
> On 09/12/14 18:18, Ray Jui wrote:
>> Enable I2C driver support for Broadcom iProc family of SoCs by
>> selecting I2C_BCM_IPROC
>>
>> Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>> Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>> ---
>>   arch/arm/mach-bcm/Kconfig |    1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
>> index aaeec78..86ee90b 100644
>> --- a/arch/arm/mach-bcm/Kconfig
>> +++ b/arch/arm/mach-bcm/Kconfig
>> @@ -19,6 +19,7 @@ config ARCH_BCM_IPROC
>>   	select ARCH_REQUIRE_GPIOLIB
>>   	select ARM_AMBA
>>   	select PINCTRL
>> +	select I2C_BCM_IPROC
>
> One way to avoid having to modify mach-bcm/Kconfig would be to have your
> i2c driver Kconfig do this:
>
> default ARCH_BCM_IPROC
>
> would that work?
>
Yes. So in which case it is better to select a driver from the 
architecture specific Kconfig?

>>   	help
>>   	  This enables support for systems based on Broadcom IPROC architected SoCs.
>>   	  The IPROC complex contains one or more ARM CPUs along with common
>>
>
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[PATCH v2 3/4] ARM: mach-bcm: Enable I2C support for iProc

[Ray Jui]

On 12/9/2014 6:20 PM, Florian Fainelli wrote:
> On 09/12/14 18:18, Ray Jui wrote:
>> Enable I2C driver support for Broadcom iProc family of SoCs by
>> selecting I2C_BCM_IPROC
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>> ---
>>   arch/arm/mach-bcm/Kconfig |    1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
>> index aaeec78..86ee90b 100644
>> --- a/arch/arm/mach-bcm/Kconfig
>> +++ b/arch/arm/mach-bcm/Kconfig
>> @@ -19,6 +19,7 @@ config ARCH_BCM_IPROC
>>   	select ARCH_REQUIRE_GPIOLIB
>>   	select ARM_AMBA
>>   	select PINCTRL
>> +	select I2C_BCM_IPROC
>
> One way to avoid having to modify mach-bcm/Kconfig would be to have your
> i2c driver Kconfig do this:
>
> default ARCH_BCM_IPROC
>
> would that work?
>
Yes. So in which case it is better to select a driver from the 
architecture specific Kconfig?

>>   	help
>>   	  This enables support for systems based on Broadcom IPROC architected SoCs.
>>   	  The IPROC complex contains one or more ARM CPUs along with common
>>
>

Re: [PATCH 1/4] i2c: iProc: define Broadcom iProc I2C binding

[Varka Bhadram]

[-- Attachment #1: Type: text/plain, Size: 2130 bytes --]

On Wed, Dec 10, 2014 at 7:05 AM, Ray Jui <rjui@broadcom.com> wrote:

>
>
> On 12/9/2014 5:27 PM, Varka Bhadram wrote:
>
>> Hi,
>>
>> On Wednesday 10 December 2014 06:24 AM, Ray Jui wrote:
>>
>>> Document the I2C device tree binding for Broadcom iProc family of
>>> SoCs
>>>
>>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>>> ---
>>>   .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37
>>> ++++++++++++++++++++
>>>   1 file changed, 37 insertions(+)
>>>   create mode 100644
>>> Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
>>>
>>> diff --git a/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
>>> b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
>>> new file mode 100644
>>> index 0000000..81f982c
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
>>> @@ -0,0 +1,37 @@
>>> +Broadcom iProc I2C controller
>>> +
>>> +Required properties:
>>> +
>>> +- compatible:
>>> +    Must be "brcm,iproc-i2c"
>>> +
>>> +- reg:
>>> +    Define the base and range of the I/O address space that contain
>>> the iProc
>>> +    I2C controller registers
>>> +
>>> +- interrupts:
>>> +    Should contain the I2C interrupt
>>> +
>>> +- clock-frequency:
>>> +    This is the I2C bus clock. Need to be either 100000 or 400000
>>> +
>>> +- #address-cells:
>>> +    Always 1 (for I2C addresses)
>>> +
>>> +- #size-cells:
>>> +    Always 0
>>> +
>>>
>>
>> All the properties defined with two lines of statements.
>>
>> Why cant they be with single line statement, like:
>>
>> compatible:    Must be "brcm,iproc-i2c"
>> reg:        Define the base and range of the I/O address space that
>>          contain the iProc I2C controller registers
>>
>> ....
>>
>>
>>  I thought making them two lines are more readable (and obviously that's
> very subjective, :)). But more importantly, it matches the format of other
> Broadcom iProc/Cygnus devicetree binding documents that are currently in
> progress of upstreaming.
>

But max of the bindings over the kernel follows single line statements.

-- 
Thanks and Regards,
Varka Bhadram.

[-- Attachment #2: Type: text/html, Size: 3224 bytes --]

Re: [PATCH v2 3/4] ARM: mach-bcm: Enable I2C support for iProc

[Florian Fainelli]

On 09/12/14 18:24, Ray Jui wrote:
> 
> 
> On 12/9/2014 6:20 PM, Florian Fainelli wrote:
>> On 09/12/14 18:18, Ray Jui wrote:
>>> Enable I2C driver support for Broadcom iProc family of SoCs by
>>> selecting I2C_BCM_IPROC
>>>
>>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>>> ---
>>>   arch/arm/mach-bcm/Kconfig |    1 +
>>>   1 file changed, 1 insertion(+)
>>>
>>> diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
>>> index aaeec78..86ee90b 100644
>>> --- a/arch/arm/mach-bcm/Kconfig
>>> +++ b/arch/arm/mach-bcm/Kconfig
>>> @@ -19,6 +19,7 @@ config ARCH_BCM_IPROC
>>>       select ARCH_REQUIRE_GPIOLIB
>>>       select ARM_AMBA
>>>       select PINCTRL
>>> +    select I2C_BCM_IPROC
>>
>> One way to avoid having to modify mach-bcm/Kconfig would be to have your
>> i2c driver Kconfig do this:
>>
>> default ARCH_BCM_IPROC
>>
>> would that work?
>>
> Yes. So in which case it is better to select a driver from the
> architecture specific Kconfig?

I suppose if your driver/subsystem is critical for system boot, like
powering a regulator or something that has a critical purpose, a select
is probably more appropriate here. If this is just exposing non-critical
devices, I would go with a depends on/default at the driver Kconfig level.

This is just how I see things, others would definitively have a
different view.

> 
>>>       help
>>>         This enables support for systems based on Broadcom IPROC
>>> architected SoCs.
>>>         The IPROC complex contains one or more ARM CPUs along with
>>> common
>>>
>>

Re: [PATCH v2 3/4] ARM: mach-bcm: Enable I2C support for iProc

[Florian Fainelli]

On 09/12/14 18:24, Ray Jui wrote:
> 
> 
> On 12/9/2014 6:20 PM, Florian Fainelli wrote:
>> On 09/12/14 18:18, Ray Jui wrote:
>>> Enable I2C driver support for Broadcom iProc family of SoCs by
>>> selecting I2C_BCM_IPROC
>>>
>>> Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>>> Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>>> ---
>>>   arch/arm/mach-bcm/Kconfig |    1 +
>>>   1 file changed, 1 insertion(+)
>>>
>>> diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
>>> index aaeec78..86ee90b 100644
>>> --- a/arch/arm/mach-bcm/Kconfig
>>> +++ b/arch/arm/mach-bcm/Kconfig
>>> @@ -19,6 +19,7 @@ config ARCH_BCM_IPROC
>>>       select ARCH_REQUIRE_GPIOLIB
>>>       select ARM_AMBA
>>>       select PINCTRL
>>> +    select I2C_BCM_IPROC
>>
>> One way to avoid having to modify mach-bcm/Kconfig would be to have your
>> i2c driver Kconfig do this:
>>
>> default ARCH_BCM_IPROC
>>
>> would that work?
>>
> Yes. So in which case it is better to select a driver from the
> architecture specific Kconfig?

I suppose if your driver/subsystem is critical for system boot, like
powering a regulator or something that has a critical purpose, a select
is probably more appropriate here. If this is just exposing non-critical
devices, I would go with a depends on/default at the driver Kconfig level.

This is just how I see things, others would definitively have a
different view.

> 
>>>       help
>>>         This enables support for systems based on Broadcom IPROC
>>> architected SoCs.
>>>         The IPROC complex contains one or more ARM CPUs along with
>>> common
>>>
>>

[PATCH v2 3/4] ARM: mach-bcm: Enable I2C support for iProc

[Florian Fainelli]

On 09/12/14 18:24, Ray Jui wrote:
> 
> 
> On 12/9/2014 6:20 PM, Florian Fainelli wrote:
>> On 09/12/14 18:18, Ray Jui wrote:
>>> Enable I2C driver support for Broadcom iProc family of SoCs by
>>> selecting I2C_BCM_IPROC
>>>
>>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>>> ---
>>>   arch/arm/mach-bcm/Kconfig |    1 +
>>>   1 file changed, 1 insertion(+)
>>>
>>> diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
>>> index aaeec78..86ee90b 100644
>>> --- a/arch/arm/mach-bcm/Kconfig
>>> +++ b/arch/arm/mach-bcm/Kconfig
>>> @@ -19,6 +19,7 @@ config ARCH_BCM_IPROC
>>>       select ARCH_REQUIRE_GPIOLIB
>>>       select ARM_AMBA
>>>       select PINCTRL
>>> +    select I2C_BCM_IPROC
>>
>> One way to avoid having to modify mach-bcm/Kconfig would be to have your
>> i2c driver Kconfig do this:
>>
>> default ARCH_BCM_IPROC
>>
>> would that work?
>>
> Yes. So in which case it is better to select a driver from the
> architecture specific Kconfig?

I suppose if your driver/subsystem is critical for system boot, like
powering a regulator or something that has a critical purpose, a select
is probably more appropriate here. If this is just exposing non-critical
devices, I would go with a depends on/default at the driver Kconfig level.

This is just how I see things, others would definitively have a
different view.

> 
>>>       help
>>>         This enables support for systems based on Broadcom IPROC
>>> architected SoCs.
>>>         The IPROC complex contains one or more ARM CPUs along with
>>> common
>>>
>>

Re: [PATCH 2/4] i2c: iproc: Add Broadcom iProc I2C Driver

[Varka Bhadram]

[-- Attachment #1: Type: text/plain, Size: 9489 bytes --]

On Wed, Dec 10, 2014 at 7:11 AM, Ray Jui <rjui@broadcom.com> wrote:

>
>
> On 12/9/2014 5:33 PM, Varka Bhadram wrote:
>
>>
>> On Wednesday 10 December 2014 06:24 AM, Ray Jui wrote:
>>
>>> Add initial support to the Broadcom iProc I2C controller found in the
>>> iProc family of SoCs.
>>>
>>> The iProc I2C controller has separate internal TX and RX FIFOs, each has
>>> a size of 64 bytes. The iProc I2C controller supports two bus speeds
>>> including standard mode (100kHz) and fast mode (400kHz)
>>>
>>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>>> ---
>>>   drivers/i2c/busses/Kconfig         |    9 +
>>>   drivers/i2c/busses/Makefile        |    1 +
>>>   drivers/i2c/busses/i2c-bcm-iproc.c |  503
>>> ++++++++++++++++++++++++++++++++++++
>>>   3 files changed, 513 insertions(+)
>>>   create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c
>>>
>>> (...)

> +static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *dev,
>>> +        struct i2c_msg *msg)
>>> +{
>>>
>>
>> dto...
>>
>>  One more indent? Sure.
>
> Yes...
 static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *dev,
                                          struct i2c_msg *msg)

>
>  +    int ret, i;
>>> +    u8 addr;
>>> +    u32 val;
>>> +    unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
>>> +
>>> +    if (msg->len < 1 || msg->len > M_TX_RX_FIFO_SIZE - 1) {
>>> +        dev_err(dev->device,
>>> +            "supported data length is 1 - %u bytes\n",
>>> +                M_TX_RX_FIFO_SIZE - 1);
>>> +        return -EINVAL;
>>> +    }
>>> +
>>> +    dev->msg = msg;
>>> +    ret = __wait_for_bus_idle(dev);
>>> +    if (ret)
>>> +        return ret;
>>> +
>>> +    ret = bcm_iproc_i2c_format_addr(dev, msg, &addr);
>>> +    if (ret)
>>> +        return ret;
>>> +
>>> +    /* load slave address into the TX FIFO */
>>> +    writel(addr, dev->base + M_TX_OFFSET);
>>> +
>>> +    /* for a write transaction, load data into the TX FIFO */
>>> +    if (!(msg->flags & I2C_M_RD)) {
>>> +        for (i = 0; i < msg->len; i++) {
>>> +            val = msg->buf[i];
>>> +
>>> +            /* mark the last byte */
>>> +            if (i == msg->len - 1)
>>> +                val |= 1 << M_TX_WR_STATUS_SHIFT;
>>> +
>>> +            writel(val, dev->base + M_TX_OFFSET);
>>> +        }
>>> +    }
>>> +
>>> +    /* mark as incomplete before starting the transaction */
>>> +    reinit_completion(&dev->done);
>>> +
>>> +    /*
>>> +     * Enable the "start busy" interrupt, which will be triggered after
>>> +     * the transaction is done
>>> +     */
>>> +    writel(1 << IE_M_START_BUSY_SHIFT, dev->base + IE_OFFSET);
>>> +
>>> +    /*
>>> +     * Now we can activate the transfer. For a read operation,
>>> specify the
>>> +     * number of bytes to read
>>> +     */
>>> +    val = 1 << M_CMD_START_BUSY_SHIFT;
>>> +    if (msg->flags & I2C_M_RD) {
>>> +        val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
>>> +            (msg->len << M_CMD_RD_CNT_SHIFT);
>>> +    } else {
>>> +        val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
>>> +    }
>>> +    writel(val, dev->base + M_CMD_OFFSET);
>>> +
>>> +    time_left = wait_for_completion_timeout(&dev->done, time_left);
>>> +
>>> +    /* disable all interrupts */
>>> +    writel(0, dev->base + IE_OFFSET);
>>> +
>>> +    if (!time_left) {
>>> +        dev_err(dev->device, "transaction times out\n");
>>> +
>>> +        /* flush FIFOs */
>>> +        val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
>>> +            (1 << M_FIFO_TX_FLUSH_SHIFT);
>>> +        writel(val, dev->base + M_FIFO_CTRL_OFFSET);
>>> +        return -EREMOTEIO;
>>> +    }
>>> +
>>> +    ret = bcm_iproc_i2c_check_status(dev);
>>> +    if (ret) {
>>> +        /* flush both TX/RX FIFOs */
>>> +        val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
>>> +            (1 << M_FIFO_TX_FLUSH_SHIFT);
>>> +        writel(val, dev->base + M_FIFO_CTRL_OFFSET);
>>> +        return ret;
>>> +    }
>>> +
>>> +    /*
>>> +     * For a read operation, we now need to load the data from FIFO
>>> +     * into the memory buffer
>>> +     */
>>> +    if (msg->flags & I2C_M_RD) {
>>> +        for (i = 0; i < msg->len; i++) {
>>> +            msg->buf[i] = (readl(dev->base + M_RX_OFFSET) >>
>>> +                    M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
>>> +        }
>>> +    }
>>> +
>>> +    dev_dbg(dev->device, "xfer %c, addr=0x%02x, len=%d\n",
>>> +            (msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
>>> +            msg->len);
>>> +    dev_dbg(dev->device, "**** data start ****\n");
>>> +    for (i = 0; i < msg->len; i++)
>>> +        dev_dbg(dev->device, "0x%02x ",  msg->buf[i]);
>>> +    dev_dbg(dev->device, "**** data end ****\n");
>>> +
>>> +    return 0;
>>> +}
>>> +
>>> +static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
>>> +                 struct i2c_msg msgs[], int num)
>>> +{
>>> +    struct bcm_iproc_i2c_dev *dev = i2c_get_adapdata(adapter);
>>> +    int ret, i;
>>> +
>>> +    /* go through all messages */
>>> +    for (i = 0; i < num; i++) {
>>> +        ret = bcm_iproc_i2c_xfer_single_msg(dev, &msgs[i]);
>>> +        if (ret) {
>>> +            dev_err(dev->device, "xfer failed\n");
>>> +            return ret;
>>> +        }
>>> +    }
>>> +
>>> +    return num;
>>> +}
>>> +
>>> +static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
>>> +{
>>> +    return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
>>> +}
>>> +
>>> +static const struct i2c_algorithm bcm_iproc_algo = {
>>> +    .master_xfer = bcm_iproc_i2c_xfer,
>>> +    .functionality = bcm_iproc_i2c_functionality,
>>> +};
>>> +
>>> +static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *dev)
>>> +{
>>> +    unsigned int bus_speed, speed_bit;
>>> +    u32 val;
>>> +    int ret = of_property_read_u32(dev->device->of_node,
>>> "clock-frequency",
>>> +                       &bus_speed);
>>> +    if (ret < 0) {
>>> +        dev_err(dev->device, "missing clock-frequency property\n");
>>> +        return -ENODEV;
>>> +    }
>>> +
>>> +    switch (bus_speed) {
>>> +    case 100000:
>>> +        speed_bit = 0;
>>> +        break;
>>> +    case 400000:
>>> +        speed_bit = 1;
>>> +        break;
>>> +    default:
>>> +        dev_err(dev->device, "%d Hz bus speed not supported\n",
>>> +                bus_speed);
>>> +        dev_err(dev->device, "valid speeds are 100khz and 400khz\n");
>>> +        return -EINVAL;
>>> +    }
>>> +
>>> +    val = readl(dev->base + TIM_CFG_OFFSET);
>>> +    val &= ~(1 << TIME_CFG_MODE_400_SHIFT);
>>> +    val |= speed_bit << TIME_CFG_MODE_400_SHIFT;
>>> +    writel(val, dev->base + TIM_CFG_OFFSET);
>>> +
>>> +    dev_info(dev->device, "bus set to %u Hz\n", bus_speed);
>>> +
>>> +    return 0;
>>> +}
>>> +
>>> +static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *dev)
>>> +{
>>> +    u32 val;
>>> +
>>> +    /* put controller in reset */
>>> +    val = readl(dev->base + CFG_OFFSET);
>>> +    val |= 1 << CFG_RESET_SHIFT;
>>> +    val &= ~(1 << CFG_EN_SHIFT);
>>> +    writel(val, dev->base + CFG_OFFSET);
>>> +
>>> +    /* wait 100 usec per spec */
>>> +    udelay(100);
>>> +
>>> +    /* bring controller out of reset */
>>> +    val = readl(dev->base + CFG_OFFSET);
>>> +    val &= ~(1 << CFG_RESET_SHIFT);
>>> +    writel(val, dev->base + CFG_OFFSET);
>>> +
>>> +    /* flush TX/RX FIFOs and set RX FIFO threshold to zero */
>>> +    val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
>>> +    writel(val, dev->base + M_FIFO_CTRL_OFFSET);
>>> +
>>> +    /* disable all interrupts */
>>> +    val = 0;
>>> +    writel(val, dev->base + IE_OFFSET);
>>> +
>>> +    /* clear all pending interrupts */
>>> +    val = readl(dev->base + IS_OFFSET);
>>> +    writel(val, dev->base + IS_OFFSET);
>>> +
>>> +    return 0;
>>> +}
>>> +
>>> +static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *dev)
>>> +{
>>> +    u32 val;
>>> +
>>> +    val = readl(dev->base + CFG_OFFSET);
>>> +    val |= 1 << CFG_EN_SHIFT;
>>> +    writel(val, dev->base + CFG_OFFSET);
>>> +}
>>> +
>>> +static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *dev)
>>> +{
>>> +    u32 val;
>>> +
>>> +    val = readl(dev->base + CFG_OFFSET);
>>> +    val &= ~(1 << CFG_EN_SHIFT);
>>> +    writel(val, dev->base + CFG_OFFSET);
>>> +}
>>> +
>>> +static int bcm_iproc_i2c_probe(struct platform_device *pdev)
>>> +{
>>> +    int irq, ret = 0;
>>> +    struct bcm_iproc_i2c_dev *dev;
>>> +    struct i2c_adapter *adap;
>>> +    struct resource *res;
>>> +
>>> +    dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
>>> +    if (!dev)
>>> +        return -ENOMEM;
>>> +
>>> +    platform_set_drvdata(pdev, dev);
>>> +    dev->device = &pdev->dev;
>>> +    init_completion(&dev->done);
>>> +
>>> +    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>> +    if (!res)
>>> +        return -ENODEV;
>>>
>>
>> We can remove this resource check. This checking will happen with
>> devm_ioremap_resource()
>>
>>  Don't you need to obtain a valid resource and pass it into
> devm_ioremap_resource? Without 'res' being assigned a valid resource,
> devm_ioremap_resource will reject with "invalid resource".
>
>   platform_get_resource() will return a resource, checking on this
resource is happening at
http://lxr.free-electrons.com/source/lib/devres.c#L115. So no need to check
it explicitly.

If you check here it will be duplication of check with resource. Two times
we are checking on
the resource. No point of doing like that.

Thanks.

[-- Attachment #2: Type: text/html, Size: 13287 bytes --]

Re: [PATCH 1/4] i2c: iProc: define Broadcom iProc I2C binding

[Ray Jui]

On 12/9/2014 7:12 PM, Varka Bhadram wrote:
>
>
> On Wed, Dec 10, 2014 at 7:05 AM, Ray Jui <rjui@broadcom.com
> <mailto:rjui@broadcom.com>> wrote:
>
>
>
>     On 12/9/2014 5:27 PM, Varka Bhadram wrote:
>
>         Hi,
>
>         On Wednesday 10 December 2014 06:24 AM, Ray Jui wrote:
>
>             Document the I2C device tree binding for Broadcom iProc
>             family of
>             SoCs
>
>             Signed-off-by: Ray Jui <rjui@broadcom.com
>             <mailto:rjui@broadcom.com>>
>             Reviewed-by: Scott Branden <sbranden@broadcom.com
>             <mailto:sbranden@broadcom.com>>
>             ---
>                .../devicetree/bindings/i2c/__brcm,iproc-i2c.txt     |   37
>             ++++++++++++++++++++
>                1 file changed, 37 insertions(+)
>                create mode 100644
>             Documentation/devicetree/__bindings/i2c/brcm,iproc-i2c.__txt
>
>             diff --git
>             a/Documentation/devicetree/__bindings/i2c/brcm,iproc-i2c.__txt
>             b/Documentation/devicetree/__bindings/i2c/brcm,iproc-i2c.__txt
>             new file mode 100644
>             index 0000000..81f982c
>             --- /dev/null
>             +++
>             b/Documentation/devicetree/__bindings/i2c/brcm,iproc-i2c.__txt
>             @@ -0,0 +1,37 @@
>             +Broadcom iProc I2C controller
>             +
>             +Required properties:
>             +
>             +- compatible:
>             +    Must be "brcm,iproc-i2c"
>             +
>             +- reg:
>             +    Define the base and range of the I/O address space that
>             contain
>             the iProc
>             +    I2C controller registers
>             +
>             +- interrupts:
>             +    Should contain the I2C interrupt
>             +
>             +- clock-frequency:
>             +    This is the I2C bus clock. Need to be either 100000 or
>             400000
>             +
>             +- #address-cells:
>             +    Always 1 (for I2C addresses)
>             +
>             +- #size-cells:
>             +    Always 0
>             +
>
>
>         All the properties defined with two lines of statements.
>
>         Why cant they be with single line statement, like:
>
>         compatible:    Must be "brcm,iproc-i2c"
>         reg:        Define the base and range of the I/O address space that
>                   contain the iProc I2C controller registers
>
>         ....
>
>
>     I thought making them two lines are more readable (and obviously
>     that's very subjective, :)). But more importantly, it matches the
>     format of other Broadcom iProc/Cygnus devicetree binding documents
>     that are currently in progress of upstreaming.
>
>
> But max of the bindings over the kernel follows single line statements.
>
> --
> Thanks and Regards,
> Varka Bhadram.
Is it a requirement for these property descriptions to be one line? If 
not, I prefer to stick with the way it is now. Thanks.

Re: [PATCH 1/4] i2c: iProc: define Broadcom iProc I2C binding

[Ray Jui]

On 12/9/2014 7:12 PM, Varka Bhadram wrote:
>
>
> On Wed, Dec 10, 2014 at 7:05 AM, Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org
> <mailto:rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>> wrote:
>
>
>
>     On 12/9/2014 5:27 PM, Varka Bhadram wrote:
>
>         Hi,
>
>         On Wednesday 10 December 2014 06:24 AM, Ray Jui wrote:
>
>             Document the I2C device tree binding for Broadcom iProc
>             family of
>             SoCs
>
>             Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org
>             <mailto:rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>>
>             Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org
>             <mailto:sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>>
>             ---
>                .../devicetree/bindings/i2c/__brcm,iproc-i2c.txt     |   37
>             ++++++++++++++++++++
>                1 file changed, 37 insertions(+)
>                create mode 100644
>             Documentation/devicetree/__bindings/i2c/brcm,iproc-i2c.__txt
>
>             diff --git
>             a/Documentation/devicetree/__bindings/i2c/brcm,iproc-i2c.__txt
>             b/Documentation/devicetree/__bindings/i2c/brcm,iproc-i2c.__txt
>             new file mode 100644
>             index 0000000..81f982c
>             --- /dev/null
>             +++
>             b/Documentation/devicetree/__bindings/i2c/brcm,iproc-i2c.__txt
>             @@ -0,0 +1,37 @@
>             +Broadcom iProc I2C controller
>             +
>             +Required properties:
>             +
>             +- compatible:
>             +    Must be "brcm,iproc-i2c"
>             +
>             +- reg:
>             +    Define the base and range of the I/O address space that
>             contain
>             the iProc
>             +    I2C controller registers
>             +
>             +- interrupts:
>             +    Should contain the I2C interrupt
>             +
>             +- clock-frequency:
>             +    This is the I2C bus clock. Need to be either 100000 or
>             400000
>             +
>             +- #address-cells:
>             +    Always 1 (for I2C addresses)
>             +
>             +- #size-cells:
>             +    Always 0
>             +
>
>
>         All the properties defined with two lines of statements.
>
>         Why cant they be with single line statement, like:
>
>         compatible:    Must be "brcm,iproc-i2c"
>         reg:        Define the base and range of the I/O address space that
>                   contain the iProc I2C controller registers
>
>         ....
>
>
>     I thought making them two lines are more readable (and obviously
>     that's very subjective, :)). But more importantly, it matches the
>     format of other Broadcom iProc/Cygnus devicetree binding documents
>     that are currently in progress of upstreaming.
>
>
> But max of the bindings over the kernel follows single line statements.
>
> --
> Thanks and Regards,
> Varka Bhadram.
Is it a requirement for these property descriptions to be one line? If 
not, I prefer to stick with the way it is now. Thanks.

[PATCH 1/4] i2c: iProc: define Broadcom iProc I2C binding

[Ray Jui]

On 12/9/2014 7:12 PM, Varka Bhadram wrote:
>
>
> On Wed, Dec 10, 2014 at 7:05 AM, Ray Jui <rjui@broadcom.com
> <mailto:rjui@broadcom.com>> wrote:
>
>
>
>     On 12/9/2014 5:27 PM, Varka Bhadram wrote:
>
>         Hi,
>
>         On Wednesday 10 December 2014 06:24 AM, Ray Jui wrote:
>
>             Document the I2C device tree binding for Broadcom iProc
>             family of
>             SoCs
>
>             Signed-off-by: Ray Jui <rjui@broadcom.com
>             <mailto:rjui@broadcom.com>>
>             Reviewed-by: Scott Branden <sbranden@broadcom.com
>             <mailto:sbranden@broadcom.com>>
>             ---
>                .../devicetree/bindings/i2c/__brcm,iproc-i2c.txt     |   37
>             ++++++++++++++++++++
>                1 file changed, 37 insertions(+)
>                create mode 100644
>             Documentation/devicetree/__bindings/i2c/brcm,iproc-i2c.__txt
>
>             diff --git
>             a/Documentation/devicetree/__bindings/i2c/brcm,iproc-i2c.__txt
>             b/Documentation/devicetree/__bindings/i2c/brcm,iproc-i2c.__txt
>             new file mode 100644
>             index 0000000..81f982c
>             --- /dev/null
>             +++
>             b/Documentation/devicetree/__bindings/i2c/brcm,iproc-i2c.__txt
>             @@ -0,0 +1,37 @@
>             +Broadcom iProc I2C controller
>             +
>             +Required properties:
>             +
>             +- compatible:
>             +    Must be "brcm,iproc-i2c"
>             +
>             +- reg:
>             +    Define the base and range of the I/O address space that
>             contain
>             the iProc
>             +    I2C controller registers
>             +
>             +- interrupts:
>             +    Should contain the I2C interrupt
>             +
>             +- clock-frequency:
>             +    This is the I2C bus clock. Need to be either 100000 or
>             400000
>             +
>             +- #address-cells:
>             +    Always 1 (for I2C addresses)
>             +
>             +- #size-cells:
>             +    Always 0
>             +
>
>
>         All the properties defined with two lines of statements.
>
>         Why cant they be with single line statement, like:
>
>         compatible:    Must be "brcm,iproc-i2c"
>         reg:        Define the base and range of the I/O address space that
>                   contain the iProc I2C controller registers
>
>         ....
>
>
>     I thought making them two lines are more readable (and obviously
>     that's very subjective, :)). But more importantly, it matches the
>     format of other Broadcom iProc/Cygnus devicetree binding documents
>     that are currently in progress of upstreaming.
>
>
> But max of the bindings over the kernel follows single line statements.
>
> --
> Thanks and Regards,
> Varka Bhadram.
Is it a requirement for these property descriptions to be one line? If 
not, I prefer to stick with the way it is now. Thanks.

Re: [PATCH 2/4] i2c: iproc: Add Broadcom iProc I2C Driver

[Varka Bhadram]

[-- Attachment #1: Type: text/plain, Size: 2377 bytes --]

On Wed, Dec 10, 2014 at 8:51 AM, Varka Bhadram <varkabhadram@gmail.com>
wrote:


> On Wed, Dec 10, 2014 at 7:11 AM, Ray Jui <rjui@broadcom.com> wrote:
>
>>
>>
>> On 12/9/2014 5:33 PM, Varka Bhadram wrote:
>>
>>>
>>> On Wednesday 10 December 2014 06:24 AM, Ray Jui wrote:
>>>
>>>> Add initial support to the Broadcom iProc I2C controller found in the
>>>> iProc family of SoCs.
>>>>
>>>> The iProc I2C controller has separate internal TX and RX FIFOs, each has
>>>> a size of 64 bytes. The iProc I2C controller supports two bus speeds
>>>> including standard mode (100kHz) and fast mode (400kHz)
>>>>
>>>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>>>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>>>> ---
>>>>   drivers/i2c/busses/Kconfig         |    9 +
>>>>   drivers/i2c/busses/Makefile        |    1 +
>>>>   drivers/i2c/busses/i2c-bcm-iproc.c |  503
>>>> ++++++++++++++++++++++++++++++++++++
>>>>   3 files changed, 513 insertions(+)
>>>>   create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c
>>>>
>>>> (...)
>
> +static int bcm_iproc_i2c_probe(struct platform_device *pdev)
>>>> +{
>>>> +    int irq, ret = 0;
>>>> +    struct bcm_iproc_i2c_dev *dev;
>>>> +    struct i2c_adapter *adap;
>>>> +    struct resource *res;
>>>> +
>>>> +    dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
>>>> +    if (!dev)
>>>> +        return -ENOMEM;
>>>> +
>>>> +    platform_set_drvdata(pdev, dev);
>>>> +    dev->device = &pdev->dev;
>>>> +    init_completion(&dev->done);
>>>> +
>>>> +    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>>> +    if (!res)
>>>> +        return -ENODEV;
>>>>
>>>
>>> We can remove this resource check. This checking will happen with
>>> devm_ioremap_resource()
>>>
>>>  Don't you need to obtain a valid resource and pass it into
>> devm_ioremap_resource? Without 'res' being assigned a valid resource,
>> devm_ioremap_resource will reject with "invalid resource".
>>
>>   platform_get_resource() will return a resource, checking on this
> resource is happening at
> http://lxr.free-electrons.com/source/lib/devres.c#L115. So no need to
> check it explicitly.
>
> If you check here it will be duplication of check with resource. Two times
> we are checking on
> the resource. No point of doing like that.
>
> Thanks.
>

See this: http://lxr.free-electrons.com/source/lib/devres.c#L102

-- 
Thanks and Regards,
Varka Bhadram.

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Re: [PATCH 2/4] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 12/9/2014 7:28 PM, Varka Bhadram wrote:
>
>
> On Wed, Dec 10, 2014 at 8:51 AM, Varka Bhadram <varkabhadram@gmail.com
> <mailto:varkabhadram@gmail.com>> wrote:
>
>     On Wed, Dec 10, 2014 at 7:11 AM, Ray Jui <rjui@broadcom.com
>     <mailto:rjui@broadcom.com>> wrote:
>
>
>
>         On 12/9/2014 5:33 PM, Varka Bhadram wrote:
>
>
>             On Wednesday 10 December 2014 06:24 AM, Ray Jui wrote:
>
>                 Add initial support to the Broadcom iProc I2C controller
>                 found in the
>                 iProc family of SoCs.
>
>                 The iProc I2C controller has separate internal TX and RX
>                 FIFOs, each has
>                 a size of 64 bytes. The iProc I2C controller supports
>                 two bus speeds
>                 including standard mode (100kHz) and fast mode (400kHz)
>
>                 Signed-off-by: Ray Jui <rjui@broadcom.com
>                 <mailto:rjui@broadcom.com>>
>                 Reviewed-by: Scott Branden <sbranden@broadcom.com
>                 <mailto:sbranden@broadcom.com>>
>                 ---
>                    drivers/i2c/busses/Kconfig         |    9 +
>                    drivers/i2c/busses/Makefile        |    1 +
>                    drivers/i2c/busses/i2c-bcm-iproc.c |  503
>                 ++++++++++++++++++++++++++++++++++++
>                    3 files changed, 513 insertions(+)
>                    create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c
>
>     (...)
>
>                 +static int bcm_iproc_i2c_probe(struct platform_device
>                 *pdev)
>                 +{
>                 +    int irq, ret = 0;
>                 +    struct bcm_iproc_i2c_dev *dev;
>                 +    struct i2c_adapter *adap;
>                 +    struct resource *res;
>                 +
>                 +    dev = devm_kzalloc(&pdev->dev, sizeof(*dev),
>                 GFP_KERNEL);
>                 +    if (!dev)
>                 +        return -ENOMEM;
>                 +
>                 +    platform_set_drvdata(pdev, dev);
>                 +    dev->device = &pdev->dev;
>                 +    init_completion(&dev->done);
>                 +
>                 +    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>                 +    if (!res)
>                 +        return -ENODEV;
>
>
>             We can remove this resource check. This checking will happen
>             with
>             devm_ioremap_resource()
>
>         Don't you need to obtain a valid resource and pass it into
>         devm_ioremap_resource? Without 'res' being assigned a valid
>         resource, devm_ioremap_resource will reject with "invalid resource".
>
>     platform_get_resource() will return a resource, checking on this
>     resource is happening at
>     http://lxr.free-electrons.com/source/lib/devres.c#L115. So no need
>     to check it explicitly.
>
>     If you check here it will be duplication of check with resource. Two
>     times we are checking on
>     the resource. No point of doing like that.
>
>     Thanks.
Sorry I misunderstood what you meant. Okay I'll get rid of if (!res) 
check there. Thanks.

>
>
> See this: http://lxr.free-electrons.com/source/lib/devres.c#L102
>
> --
> Thanks and Regards,
> Varka Bhadram.

Re: [PATCH 2/4] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 12/9/2014 7:28 PM, Varka Bhadram wrote:
>
>
> On Wed, Dec 10, 2014 at 8:51 AM, Varka Bhadram <varkabhadram-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
> <mailto:varkabhadram-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>> wrote:
>
>     On Wed, Dec 10, 2014 at 7:11 AM, Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org
>     <mailto:rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>> wrote:
>
>
>
>         On 12/9/2014 5:33 PM, Varka Bhadram wrote:
>
>
>             On Wednesday 10 December 2014 06:24 AM, Ray Jui wrote:
>
>                 Add initial support to the Broadcom iProc I2C controller
>                 found in the
>                 iProc family of SoCs.
>
>                 The iProc I2C controller has separate internal TX and RX
>                 FIFOs, each has
>                 a size of 64 bytes. The iProc I2C controller supports
>                 two bus speeds
>                 including standard mode (100kHz) and fast mode (400kHz)
>
>                 Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org
>                 <mailto:rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>>
>                 Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org
>                 <mailto:sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>>
>                 ---
>                    drivers/i2c/busses/Kconfig         |    9 +
>                    drivers/i2c/busses/Makefile        |    1 +
>                    drivers/i2c/busses/i2c-bcm-iproc.c |  503
>                 ++++++++++++++++++++++++++++++++++++
>                    3 files changed, 513 insertions(+)
>                    create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c
>
>     (...)
>
>                 +static int bcm_iproc_i2c_probe(struct platform_device
>                 *pdev)
>                 +{
>                 +    int irq, ret = 0;
>                 +    struct bcm_iproc_i2c_dev *dev;
>                 +    struct i2c_adapter *adap;
>                 +    struct resource *res;
>                 +
>                 +    dev = devm_kzalloc(&pdev->dev, sizeof(*dev),
>                 GFP_KERNEL);
>                 +    if (!dev)
>                 +        return -ENOMEM;
>                 +
>                 +    platform_set_drvdata(pdev, dev);
>                 +    dev->device = &pdev->dev;
>                 +    init_completion(&dev->done);
>                 +
>                 +    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>                 +    if (!res)
>                 +        return -ENODEV;
>
>
>             We can remove this resource check. This checking will happen
>             with
>             devm_ioremap_resource()
>
>         Don't you need to obtain a valid resource and pass it into
>         devm_ioremap_resource? Without 'res' being assigned a valid
>         resource, devm_ioremap_resource will reject with "invalid resource".
>
>     platform_get_resource() will return a resource, checking on this
>     resource is happening at
>     http://lxr.free-electrons.com/source/lib/devres.c#L115. So no need
>     to check it explicitly.
>
>     If you check here it will be duplication of check with resource. Two
>     times we are checking on
>     the resource. No point of doing like that.
>
>     Thanks.
Sorry I misunderstood what you meant. Okay I'll get rid of if (!res) 
check there. Thanks.

>
>
> See this: http://lxr.free-electrons.com/source/lib/devres.c#L102
>
> --
> Thanks and Regards,
> Varka Bhadram.

[PATCH 2/4] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 12/9/2014 7:28 PM, Varka Bhadram wrote:
>
>
> On Wed, Dec 10, 2014 at 8:51 AM, Varka Bhadram <varkabhadram@gmail.com
> <mailto:varkabhadram@gmail.com>> wrote:
>
>     On Wed, Dec 10, 2014 at 7:11 AM, Ray Jui <rjui@broadcom.com
>     <mailto:rjui@broadcom.com>> wrote:
>
>
>
>         On 12/9/2014 5:33 PM, Varka Bhadram wrote:
>
>
>             On Wednesday 10 December 2014 06:24 AM, Ray Jui wrote:
>
>                 Add initial support to the Broadcom iProc I2C controller
>                 found in the
>                 iProc family of SoCs.
>
>                 The iProc I2C controller has separate internal TX and RX
>                 FIFOs, each has
>                 a size of 64 bytes. The iProc I2C controller supports
>                 two bus speeds
>                 including standard mode (100kHz) and fast mode (400kHz)
>
>                 Signed-off-by: Ray Jui <rjui@broadcom.com
>                 <mailto:rjui@broadcom.com>>
>                 Reviewed-by: Scott Branden <sbranden@broadcom.com
>                 <mailto:sbranden@broadcom.com>>
>                 ---
>                    drivers/i2c/busses/Kconfig         |    9 +
>                    drivers/i2c/busses/Makefile        |    1 +
>                    drivers/i2c/busses/i2c-bcm-iproc.c |  503
>                 ++++++++++++++++++++++++++++++++++++
>                    3 files changed, 513 insertions(+)
>                    create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c
>
>     (...)
>
>                 +static int bcm_iproc_i2c_probe(struct platform_device
>                 *pdev)
>                 +{
>                 +    int irq, ret = 0;
>                 +    struct bcm_iproc_i2c_dev *dev;
>                 +    struct i2c_adapter *adap;
>                 +    struct resource *res;
>                 +
>                 +    dev = devm_kzalloc(&pdev->dev, sizeof(*dev),
>                 GFP_KERNEL);
>                 +    if (!dev)
>                 +        return -ENOMEM;
>                 +
>                 +    platform_set_drvdata(pdev, dev);
>                 +    dev->device = &pdev->dev;
>                 +    init_completion(&dev->done);
>                 +
>                 +    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>                 +    if (!res)
>                 +        return -ENODEV;
>
>
>             We can remove this resource check. This checking will happen
>             with
>             devm_ioremap_resource()
>
>         Don't you need to obtain a valid resource and pass it into
>         devm_ioremap_resource? Without 'res' being assigned a valid
>         resource, devm_ioremap_resource will reject with "invalid resource".
>
>     platform_get_resource() will return a resource, checking on this
>     resource is happening at
>     http://lxr.free-electrons.com/source/lib/devres.c#L115. So no need
>     to check it explicitly.
>
>     If you check here it will be duplication of check with resource. Two
>     times we are checking on
>     the resource. No point of doing like that.
>
>     Thanks.
Sorry I misunderstood what you meant. Okay I'll get rid of if (!res) 
check there. Thanks.

>
>
> See this: http://lxr.free-electrons.com/source/lib/devres.c#L102
>
> --
> Thanks and Regards,
> Varka Bhadram.

[PATCH v3 0/3] Add I2C support to Broadcom iProc

[Ray Jui]

This patchset contains the initial I2C support for Broadcom iProc family of
SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has a
size of 64 bytes. The iProc I2C controller supports two bus speeds including
standard mode (100 kHz) and fast mode (400 kHz)

Changes from v2:
 - Have the I2C driver default to y so it does not need to be selected from
   ARCH_BCM_IPROC. This also helps to get rid of one patch. The driver still
   depends on ARCH_BCM_IPROC
 - Get rid of redundant check on resource returned by platform_get_resource

Changes from v1:
 - Fix function argument parenthesis
 - Get rid of redundant driver owner field

Ray Jui (3):
  i2c: iProc: define Broadcom iProc I2C binding
  i2c: iproc: Add Broadcom iProc I2C Driver
  ARM: dts: add I2C device nodes for Broadcom Cygnus

 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   20 +
 drivers/i2c/busses/Kconfig                         |   10 +
 drivers/i2c/busses/Makefile                        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c                 |  500 ++++++++++++++++++++
 5 files changed, 568 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

-- 
1.7.9.5

[PATCH v3 0/3] Add I2C support to Broadcom iProc

[Ray Jui]

This patchset contains the initial I2C support for Broadcom iProc family of
SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has a
size of 64 bytes. The iProc I2C controller supports two bus speeds including
standard mode (100 kHz) and fast mode (400 kHz)

Changes from v2:
 - Have the I2C driver default to y so it does not need to be selected from
   ARCH_BCM_IPROC. This also helps to get rid of one patch. The driver still
   depends on ARCH_BCM_IPROC
 - Get rid of redundant check on resource returned by platform_get_resource

Changes from v1:
 - Fix function argument parenthesis
 - Get rid of redundant driver owner field

Ray Jui (3):
  i2c: iProc: define Broadcom iProc I2C binding
  i2c: iproc: Add Broadcom iProc I2C Driver
  ARM: dts: add I2C device nodes for Broadcom Cygnus

 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   20 +
 drivers/i2c/busses/Kconfig                         |   10 +
 drivers/i2c/busses/Makefile                        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c                 |  500 ++++++++++++++++++++
 5 files changed, 568 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

-- 
1.7.9.5

[PATCH v3 0/3] Add I2C support to Broadcom iProc

[Ray Jui]

This patchset contains the initial I2C support for Broadcom iProc family of
SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has a
size of 64 bytes. The iProc I2C controller supports two bus speeds including
standard mode (100 kHz) and fast mode (400 kHz)

Changes from v2:
 - Have the I2C driver default to y so it does not need to be selected from
   ARCH_BCM_IPROC. This also helps to get rid of one patch. The driver still
   depends on ARCH_BCM_IPROC
 - Get rid of redundant check on resource returned by platform_get_resource

Changes from v1:
 - Fix function argument parenthesis
 - Get rid of redundant driver owner field

Ray Jui (3):
  i2c: iProc: define Broadcom iProc I2C binding
  i2c: iproc: Add Broadcom iProc I2C Driver
  ARM: dts: add I2C device nodes for Broadcom Cygnus

 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   20 +
 drivers/i2c/busses/Kconfig                         |   10 +
 drivers/i2c/busses/Makefile                        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c                 |  500 ++++++++++++++++++++
 5 files changed, 568 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

-- 
1.7.9.5

[PATCH v3 1/3] i2c: iProc: define Broadcom iProc I2C binding

[Ray Jui]

Document the I2C device tree binding for Broadcom iProc family of
SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt

diff --git a/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
new file mode 100644
index 0000000..81f982c
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
@@ -0,0 +1,37 @@
+Broadcom iProc I2C controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,iproc-i2c"
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+    I2C controller registers
+
+- interrupts:
+    Should contain the I2C interrupt
+
+- clock-frequency:
+    This is the I2C bus clock. Need to be either 100000 or 400000
+
+- #address-cells:
+    Always 1 (for I2C addresses)
+
+- #size-cells:
+    Always 0
+
+Example:
+	i2c0: i2c@18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+
+		codec: wm8750@1a {
+			compatible = "wlf,wm8750";
+			reg = <0x1a>;
+		};
+	};
-- 
1.7.9.5

[PATCH v3 1/3] i2c: iProc: define Broadcom iProc I2C binding

[Ray Jui]

Document the I2C device tree binding for Broadcom iProc family of
SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt

diff --git a/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
new file mode 100644
index 0000000..81f982c
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
@@ -0,0 +1,37 @@
+Broadcom iProc I2C controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,iproc-i2c"
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+    I2C controller registers
+
+- interrupts:
+    Should contain the I2C interrupt
+
+- clock-frequency:
+    This is the I2C bus clock. Need to be either 100000 or 400000
+
+- #address-cells:
+    Always 1 (for I2C addresses)
+
+- #size-cells:
+    Always 0
+
+Example:
+	i2c0: i2c@18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+
+		codec: wm8750@1a {
+			compatible = "wlf,wm8750";
+			reg = <0x1a>;
+		};
+	};
-- 
1.7.9.5

[PATCH v3 1/3] i2c: iProc: define Broadcom iProc I2C binding

[Ray Jui]

Document the I2C device tree binding for Broadcom iProc family of
SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt

diff --git a/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
new file mode 100644
index 0000000..81f982c
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
@@ -0,0 +1,37 @@
+Broadcom iProc I2C controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,iproc-i2c"
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+    I2C controller registers
+
+- interrupts:
+    Should contain the I2C interrupt
+
+- clock-frequency:
+    This is the I2C bus clock. Need to be either 100000 or 400000
+
+- #address-cells:
+    Always 1 (for I2C addresses)
+
+- #size-cells:
+    Always 0
+
+Example:
+	i2c0: i2c at 18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+
+		codec: wm8750 at 1a {
+			compatible = "wlf,wm8750";
+			reg = <0x1a>;
+		};
+	};
-- 
1.7.9.5

[PATCH v3 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

Add initial support to the Broadcom iProc I2C controller found in the
iProc family of SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has
a size of 64 bytes. The iProc I2C controller supports two bus speeds
including standard mode (100kHz) and fast mode (400kHz)

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/i2c/busses/Kconfig         |   10 +
 drivers/i2c/busses/Makefile        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c |  500 ++++++++++++++++++++++++++++++++++++
 3 files changed, 511 insertions(+)
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index c1351d9..df21366 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -372,6 +372,16 @@ config I2C_BCM2835
 	  This support is also available as a module.  If so, the module
 	  will be called i2c-bcm2835.
 
+config I2C_BCM_IPROC
+	tristate "Broadcom iProc I2C controller"
+	depends on ARCH_BCM_IPROC
+	default y
+	help
+	  If you say yes to this option, support will be included for the
+	  Broadcom iProc I2C controller.
+
+	  If you don't know what to do here, say N.
+
 config I2C_BCM_KONA
 	tristate "BCM Kona I2C adapter"
 	depends on ARCH_BCM_MOBILE
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 5e6c822..216e7be 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
 obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
 obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
 obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
+obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
 obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
 obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
 obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
new file mode 100644
index 0000000..35ac497
--- /dev/null
+++ b/drivers/i2c/busses/i2c-bcm-iproc.c
@@ -0,0 +1,500 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+
+#define CFG_OFFSET                   0x00
+#define CFG_RESET_SHIFT              31
+#define CFG_EN_SHIFT                 30
+#define CFG_M_RETRY_CNT_SHIFT        16
+#define CFG_M_RETRY_CNT_MASK         0x0f
+
+#define TIM_CFG_OFFSET               0x04
+#define TIME_CFG_MODE_400_SHIFT      31
+
+#define M_FIFO_CTRL_OFFSET           0x0c
+#define M_FIFO_RX_FLUSH_SHIFT        31
+#define M_FIFO_TX_FLUSH_SHIFT        30
+#define M_FIFO_RX_CNT_SHIFT          16
+#define M_FIFO_RX_CNT_MASK           0x7f
+#define M_FIFO_RX_THLD_SHIFT         8
+#define M_FIFO_RX_THLD_MASK          0x3f
+
+#define M_CMD_OFFSET                 0x30
+#define M_CMD_START_BUSY_SHIFT       31
+#define M_CMD_STATUS_SHIFT           25
+#define M_CMD_STATUS_MASK            0x07
+#define M_CMD_STATUS_SUCCESS         0x0
+#define M_CMD_STATUS_LOST_ARB        0x1
+#define M_CMD_STATUS_NACK_ADDR       0x2
+#define M_CMD_STATUS_NACK_DATA       0x3
+#define M_CMD_STATUS_TIMEOUT         0x4
+#define M_CMD_PROTOCOL_SHIFT         9
+#define M_CMD_PROTOCOL_MASK          0xf
+#define M_CMD_PROTOCOL_BLK_WR        0x7
+#define M_CMD_PROTOCOL_BLK_RD        0x8
+#define M_CMD_PEC_SHIFT              8
+#define M_CMD_RD_CNT_SHIFT           0
+#define M_CMD_RD_CNT_MASK            0xff
+
+#define IE_OFFSET                    0x38
+#define IE_M_RX_FIFO_FULL_SHIFT      31
+#define IE_M_RX_THLD_SHIFT           30
+#define IE_M_START_BUSY_SHIFT        28
+
+#define IS_OFFSET                    0x3c
+#define IS_M_RX_FIFO_FULL_SHIFT      31
+#define IS_M_RX_THLD_SHIFT           30
+#define IS_M_START_BUSY_SHIFT        28
+
+#define M_TX_OFFSET                  0x40
+#define M_TX_WR_STATUS_SHIFT         31
+#define M_TX_DATA_SHIFT              0
+#define M_TX_DATA_MASK               0xff
+
+#define M_RX_OFFSET                  0x44
+#define M_RX_STATUS_SHIFT            30
+#define M_RX_STATUS_MASK             0x03
+#define M_RX_PEC_ERR_SHIFT           29
+#define M_RX_DATA_SHIFT              0
+#define M_RX_DATA_MASK               0xff
+
+#define I2C_TIMEOUT_MESC             100
+#define M_TX_RX_FIFO_SIZE            64
+
+enum bus_speed_index {
+	I2C_SPD_100K = 0,
+	I2C_SPD_400K,
+};
+
+struct bcm_iproc_i2c_dev {
+	struct device *device;
+
+	void __iomem *base;
+	struct i2c_msg *msg;
+
+	struct i2c_adapter adapter;
+
+	struct completion done;
+};
+
+/*
+ * Can be expanded in the future if more interrupt status bits are utilized
+ */
+#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
+
+static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
+{
+	struct bcm_iproc_i2c_dev *dev = data;
+	u32 status = readl(dev->base + IS_OFFSET);
+
+	status &= ISR_MASK;
+
+	if (!status)
+		return IRQ_NONE;
+
+	writel(status, dev->base + IS_OFFSET);
+	complete_all(&dev->done);
+
+	return IRQ_HANDLED;
+}
+
+static int __wait_for_bus_idle(struct bcm_iproc_i2c_dev *dev)
+{
+	unsigned long timeout = jiffies + msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	while (readl(dev->base + M_CMD_OFFSET) &
+			(1 << M_CMD_START_BUSY_SHIFT)) {
+		if (time_after(jiffies, timeout)) {
+			dev_err(dev->device, "wait for bus idle timeout\n");
+			return -ETIMEDOUT;
+		}
+	}
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *dev,
+				     struct i2c_msg *msg, u8 *addr)
+{
+
+	if (msg->flags & I2C_M_TEN) {
+		dev_err(dev->device, "no support for 10-bit address\n");
+		return -EINVAL;
+	}
+
+	*addr = (msg->addr << 1) & 0xfe;
+
+	if (msg->flags & I2C_M_RD)
+		*addr |= 1;
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	val = readl(dev->base + M_CMD_OFFSET);
+	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
+
+	switch (val) {
+	case M_CMD_STATUS_SUCCESS:
+		return 0;
+
+	case M_CMD_STATUS_LOST_ARB:
+		dev_err(dev->device, "lost bus arbitration\n");
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_NACK_ADDR:
+		dev_err(dev->device, "NAK addr:0x%02x\n", dev->msg->addr);
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_NACK_DATA:
+		dev_err(dev->device, "NAK data\n");
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_TIMEOUT:
+		dev_err(dev->device, "bus timeout\n");
+		return -ETIMEDOUT;
+
+	default:
+		dev_err(dev->device, "unknown error code=%d\n", val);
+		return -EREMOTEIO;
+	}
+
+	return -EREMOTEIO;
+}
+
+static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *dev,
+					 struct i2c_msg *msg)
+{
+	int ret, i;
+	u8 addr;
+	u32 val;
+	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	if (msg->len < 1 || msg->len > M_TX_RX_FIFO_SIZE - 1) {
+		dev_err(dev->device,
+			"supported data length is 1 - %u bytes\n",
+				M_TX_RX_FIFO_SIZE - 1);
+		return -EINVAL;
+	}
+
+	dev->msg = msg;
+	ret = __wait_for_bus_idle(dev);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_format_addr(dev, msg, &addr);
+	if (ret)
+		return ret;
+
+	/* load slave address into the TX FIFO */
+	writel(addr, dev->base + M_TX_OFFSET);
+
+	/* for a write transaction, load data into the TX FIFO */
+	if (!(msg->flags & I2C_M_RD)) {
+		for (i = 0; i < msg->len; i++) {
+			val = msg->buf[i];
+
+			/* mark the last byte */
+			if (i == msg->len - 1)
+				val |= 1 << M_TX_WR_STATUS_SHIFT;
+
+			writel(val, dev->base + M_TX_OFFSET);
+		}
+	}
+
+	/* mark as incomplete before starting the transaction */
+	reinit_completion(&dev->done);
+
+	/*
+	 * Enable the "start busy" interrupt, which will be triggered after
+	 * the transaction is done
+	 */
+	writel(1 << IE_M_START_BUSY_SHIFT, dev->base + IE_OFFSET);
+
+	/*
+	 * Now we can activate the transfer. For a read operation, specify the
+	 * number of bytes to read
+	 */
+	val = 1 << M_CMD_START_BUSY_SHIFT;
+	if (msg->flags & I2C_M_RD) {
+		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
+			(msg->len << M_CMD_RD_CNT_SHIFT);
+	} else {
+		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
+	}
+	writel(val, dev->base + M_CMD_OFFSET);
+
+	time_left = wait_for_completion_timeout(&dev->done, time_left);
+
+	/* disable all interrupts */
+	writel(0, dev->base + IE_OFFSET);
+
+	if (!time_left) {
+		dev_err(dev->device, "transaction times out\n");
+
+		/* flush FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+			(1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, dev->base + M_FIFO_CTRL_OFFSET);
+		return -EREMOTEIO;
+	}
+
+	ret = bcm_iproc_i2c_check_status(dev);
+	if (ret) {
+		/* flush both TX/RX FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+			(1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, dev->base + M_FIFO_CTRL_OFFSET);
+		return ret;
+	}
+
+	/*
+	 * For a read operation, we now need to load the data from FIFO
+	 * into the memory buffer
+	 */
+	if (msg->flags & I2C_M_RD) {
+		for (i = 0; i < msg->len; i++) {
+			msg->buf[i] = (readl(dev->base + M_RX_OFFSET) >>
+					M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
+		}
+	}
+
+	dev_dbg(dev->device, "xfer %c, addr=0x%02x, len=%d\n",
+			(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
+			msg->len);
+	dev_dbg(dev->device, "**** data start ****\n");
+	for (i = 0; i < msg->len; i++)
+		dev_dbg(dev->device, "0x%02x ",  msg->buf[i]);
+	dev_dbg(dev->device, "**** data end ****\n");
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
+			      struct i2c_msg msgs[], int num)
+{
+	struct bcm_iproc_i2c_dev *dev = i2c_get_adapdata(adapter);
+	int ret, i;
+
+	/* go through all messages */
+	for (i = 0; i < num; i++) {
+		ret = bcm_iproc_i2c_xfer_single_msg(dev, &msgs[i]);
+		if (ret) {
+			dev_err(dev->device, "xfer failed\n");
+			return ret;
+		}
+	}
+
+	return num;
+}
+
+static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm bcm_iproc_algo = {
+	.master_xfer = bcm_iproc_i2c_xfer,
+	.functionality = bcm_iproc_i2c_functionality,
+};
+
+static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *dev)
+{
+	unsigned int bus_speed, speed_bit;
+	u32 val;
+	int ret = of_property_read_u32(dev->device->of_node, "clock-frequency",
+				       &bus_speed);
+	if (ret < 0) {
+		dev_err(dev->device, "missing clock-frequency property\n");
+		return -ENODEV;
+	}
+
+	switch (bus_speed) {
+	case 100000:
+		speed_bit = 0;
+		break;
+	case 400000:
+		speed_bit = 1;
+		break;
+	default:
+		dev_err(dev->device, "%d Hz bus speed not supported\n",
+				bus_speed);
+		dev_err(dev->device, "valid speeds are 100khz and 400khz\n");
+		return -EINVAL;
+	}
+
+	val = readl(dev->base + TIM_CFG_OFFSET);
+	val &= ~(1 << TIME_CFG_MODE_400_SHIFT);
+	val |= speed_bit << TIME_CFG_MODE_400_SHIFT;
+	writel(val, dev->base + TIM_CFG_OFFSET);
+
+	dev_info(dev->device, "bus set to %u Hz\n", bus_speed);
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	/* put controller in reset */
+	val = readl(dev->base + CFG_OFFSET);
+	val |= 1 << CFG_RESET_SHIFT;
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, dev->base + CFG_OFFSET);
+
+	/* wait 100 usec per spec */
+	udelay(100);
+
+	/* bring controller out of reset */
+	val = readl(dev->base + CFG_OFFSET);
+	val &= ~(1 << CFG_RESET_SHIFT);
+	writel(val, dev->base + CFG_OFFSET);
+
+	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
+	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
+	writel(val, dev->base + M_FIFO_CTRL_OFFSET);
+
+	/* disable all interrupts */
+	val = 0;
+	writel(val, dev->base + IE_OFFSET);
+
+	/* clear all pending interrupts */
+	val = readl(dev->base + IS_OFFSET);
+	writel(val, dev->base + IS_OFFSET);
+
+	return 0;
+}
+
+static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	val = readl(dev->base + CFG_OFFSET);
+	val |= 1 << CFG_EN_SHIFT;
+	writel(val, dev->base + CFG_OFFSET);
+}
+
+static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	val = readl(dev->base + CFG_OFFSET);
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, dev->base + CFG_OFFSET);
+}
+
+static int bcm_iproc_i2c_probe(struct platform_device *pdev)
+{
+	int irq, ret = 0;
+	struct bcm_iproc_i2c_dev *dev;
+	struct i2c_adapter *adap;
+	struct resource *res;
+
+	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
+	if (!dev)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, dev);
+	dev->device = &pdev->dev;
+	init_completion(&dev->done);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	dev->base = devm_ioremap_resource(dev->device, res);
+	if (IS_ERR(dev->base))
+		return -ENOMEM;
+
+	ret = bcm_iproc_i2c_init(dev);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_cfg_speed(dev);
+	if (ret)
+		return ret;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		dev_err(dev->device, "no irq resource\n");
+		return irq;
+	}
+
+	ret = devm_request_irq(&pdev->dev, irq, bcm_iproc_i2c_isr,
+			IRQF_SHARED, pdev->name, dev);
+	if (ret) {
+		dev_err(dev->device, "unable to request irq %i\n", irq);
+		return ret;
+	}
+
+	bcm_iproc_i2c_enable(dev);
+
+	adap = &dev->adapter;
+	i2c_set_adapdata(adap, dev);
+	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
+	adap->algo = &bcm_iproc_algo;
+	adap->dev.parent = &pdev->dev;
+	adap->dev.of_node = pdev->dev.of_node;
+
+	ret = i2c_add_adapter(adap);
+	if (ret) {
+		dev_err(dev->device, "failed to add adapter\n");
+		return ret;
+	}
+
+	dev_info(dev->device, "device registered successfully\n");
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_remove(struct platform_device *pdev)
+{
+	struct bcm_iproc_i2c_dev *dev = platform_get_drvdata(pdev);
+
+	i2c_del_adapter(&dev->adapter);
+	bcm_iproc_i2c_disable(dev);
+
+	return 0;
+}
+
+static const struct of_device_id bcm_iproc_i2c_of_match[] = {
+	{.compatible = "brcm,iproc-i2c",},
+	{},
+};
+MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
+
+static struct platform_driver bcm_iproc_i2c_driver = {
+	.driver = {
+		   .name = "bcm-iproc-i2c",
+		   .of_match_table = bcm_iproc_i2c_of_match,
+		   },
+	.probe = bcm_iproc_i2c_probe,
+	.remove = bcm_iproc_i2c_remove,
+};
+module_platform_driver(bcm_iproc_i2c_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v3 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

Add initial support to the Broadcom iProc I2C controller found in the
iProc family of SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has
a size of 64 bytes. The iProc I2C controller supports two bus speeds
including standard mode (100kHz) and fast mode (400kHz)

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/i2c/busses/Kconfig         |   10 +
 drivers/i2c/busses/Makefile        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c |  500 ++++++++++++++++++++++++++++++++++++
 3 files changed, 511 insertions(+)
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index c1351d9..df21366 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -372,6 +372,16 @@ config I2C_BCM2835
 	  This support is also available as a module.  If so, the module
 	  will be called i2c-bcm2835.
 
+config I2C_BCM_IPROC
+	tristate "Broadcom iProc I2C controller"
+	depends on ARCH_BCM_IPROC
+	default y
+	help
+	  If you say yes to this option, support will be included for the
+	  Broadcom iProc I2C controller.
+
+	  If you don't know what to do here, say N.
+
 config I2C_BCM_KONA
 	tristate "BCM Kona I2C adapter"
 	depends on ARCH_BCM_MOBILE
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 5e6c822..216e7be 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
 obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
 obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
 obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
+obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
 obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
 obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
 obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
new file mode 100644
index 0000000..35ac497
--- /dev/null
+++ b/drivers/i2c/busses/i2c-bcm-iproc.c
@@ -0,0 +1,500 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+
+#define CFG_OFFSET                   0x00
+#define CFG_RESET_SHIFT              31
+#define CFG_EN_SHIFT                 30
+#define CFG_M_RETRY_CNT_SHIFT        16
+#define CFG_M_RETRY_CNT_MASK         0x0f
+
+#define TIM_CFG_OFFSET               0x04
+#define TIME_CFG_MODE_400_SHIFT      31
+
+#define M_FIFO_CTRL_OFFSET           0x0c
+#define M_FIFO_RX_FLUSH_SHIFT        31
+#define M_FIFO_TX_FLUSH_SHIFT        30
+#define M_FIFO_RX_CNT_SHIFT          16
+#define M_FIFO_RX_CNT_MASK           0x7f
+#define M_FIFO_RX_THLD_SHIFT         8
+#define M_FIFO_RX_THLD_MASK          0x3f
+
+#define M_CMD_OFFSET                 0x30
+#define M_CMD_START_BUSY_SHIFT       31
+#define M_CMD_STATUS_SHIFT           25
+#define M_CMD_STATUS_MASK            0x07
+#define M_CMD_STATUS_SUCCESS         0x0
+#define M_CMD_STATUS_LOST_ARB        0x1
+#define M_CMD_STATUS_NACK_ADDR       0x2
+#define M_CMD_STATUS_NACK_DATA       0x3
+#define M_CMD_STATUS_TIMEOUT         0x4
+#define M_CMD_PROTOCOL_SHIFT         9
+#define M_CMD_PROTOCOL_MASK          0xf
+#define M_CMD_PROTOCOL_BLK_WR        0x7
+#define M_CMD_PROTOCOL_BLK_RD        0x8
+#define M_CMD_PEC_SHIFT              8
+#define M_CMD_RD_CNT_SHIFT           0
+#define M_CMD_RD_CNT_MASK            0xff
+
+#define IE_OFFSET                    0x38
+#define IE_M_RX_FIFO_FULL_SHIFT      31
+#define IE_M_RX_THLD_SHIFT           30
+#define IE_M_START_BUSY_SHIFT        28
+
+#define IS_OFFSET                    0x3c
+#define IS_M_RX_FIFO_FULL_SHIFT      31
+#define IS_M_RX_THLD_SHIFT           30
+#define IS_M_START_BUSY_SHIFT        28
+
+#define M_TX_OFFSET                  0x40
+#define M_TX_WR_STATUS_SHIFT         31
+#define M_TX_DATA_SHIFT              0
+#define M_TX_DATA_MASK               0xff
+
+#define M_RX_OFFSET                  0x44
+#define M_RX_STATUS_SHIFT            30
+#define M_RX_STATUS_MASK             0x03
+#define M_RX_PEC_ERR_SHIFT           29
+#define M_RX_DATA_SHIFT              0
+#define M_RX_DATA_MASK               0xff
+
+#define I2C_TIMEOUT_MESC             100
+#define M_TX_RX_FIFO_SIZE            64
+
+enum bus_speed_index {
+	I2C_SPD_100K = 0,
+	I2C_SPD_400K,
+};
+
+struct bcm_iproc_i2c_dev {
+	struct device *device;
+
+	void __iomem *base;
+	struct i2c_msg *msg;
+
+	struct i2c_adapter adapter;
+
+	struct completion done;
+};
+
+/*
+ * Can be expanded in the future if more interrupt status bits are utilized
+ */
+#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
+
+static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
+{
+	struct bcm_iproc_i2c_dev *dev = data;
+	u32 status = readl(dev->base + IS_OFFSET);
+
+	status &= ISR_MASK;
+
+	if (!status)
+		return IRQ_NONE;
+
+	writel(status, dev->base + IS_OFFSET);
+	complete_all(&dev->done);
+
+	return IRQ_HANDLED;
+}
+
+static int __wait_for_bus_idle(struct bcm_iproc_i2c_dev *dev)
+{
+	unsigned long timeout = jiffies + msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	while (readl(dev->base + M_CMD_OFFSET) &
+			(1 << M_CMD_START_BUSY_SHIFT)) {
+		if (time_after(jiffies, timeout)) {
+			dev_err(dev->device, "wait for bus idle timeout\n");
+			return -ETIMEDOUT;
+		}
+	}
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *dev,
+				     struct i2c_msg *msg, u8 *addr)
+{
+
+	if (msg->flags & I2C_M_TEN) {
+		dev_err(dev->device, "no support for 10-bit address\n");
+		return -EINVAL;
+	}
+
+	*addr = (msg->addr << 1) & 0xfe;
+
+	if (msg->flags & I2C_M_RD)
+		*addr |= 1;
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	val = readl(dev->base + M_CMD_OFFSET);
+	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
+
+	switch (val) {
+	case M_CMD_STATUS_SUCCESS:
+		return 0;
+
+	case M_CMD_STATUS_LOST_ARB:
+		dev_err(dev->device, "lost bus arbitration\n");
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_NACK_ADDR:
+		dev_err(dev->device, "NAK addr:0x%02x\n", dev->msg->addr);
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_NACK_DATA:
+		dev_err(dev->device, "NAK data\n");
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_TIMEOUT:
+		dev_err(dev->device, "bus timeout\n");
+		return -ETIMEDOUT;
+
+	default:
+		dev_err(dev->device, "unknown error code=%d\n", val);
+		return -EREMOTEIO;
+	}
+
+	return -EREMOTEIO;
+}
+
+static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *dev,
+					 struct i2c_msg *msg)
+{
+	int ret, i;
+	u8 addr;
+	u32 val;
+	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	if (msg->len < 1 || msg->len > M_TX_RX_FIFO_SIZE - 1) {
+		dev_err(dev->device,
+			"supported data length is 1 - %u bytes\n",
+				M_TX_RX_FIFO_SIZE - 1);
+		return -EINVAL;
+	}
+
+	dev->msg = msg;
+	ret = __wait_for_bus_idle(dev);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_format_addr(dev, msg, &addr);
+	if (ret)
+		return ret;
+
+	/* load slave address into the TX FIFO */
+	writel(addr, dev->base + M_TX_OFFSET);
+
+	/* for a write transaction, load data into the TX FIFO */
+	if (!(msg->flags & I2C_M_RD)) {
+		for (i = 0; i < msg->len; i++) {
+			val = msg->buf[i];
+
+			/* mark the last byte */
+			if (i == msg->len - 1)
+				val |= 1 << M_TX_WR_STATUS_SHIFT;
+
+			writel(val, dev->base + M_TX_OFFSET);
+		}
+	}
+
+	/* mark as incomplete before starting the transaction */
+	reinit_completion(&dev->done);
+
+	/*
+	 * Enable the "start busy" interrupt, which will be triggered after
+	 * the transaction is done
+	 */
+	writel(1 << IE_M_START_BUSY_SHIFT, dev->base + IE_OFFSET);
+
+	/*
+	 * Now we can activate the transfer. For a read operation, specify the
+	 * number of bytes to read
+	 */
+	val = 1 << M_CMD_START_BUSY_SHIFT;
+	if (msg->flags & I2C_M_RD) {
+		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
+			(msg->len << M_CMD_RD_CNT_SHIFT);
+	} else {
+		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
+	}
+	writel(val, dev->base + M_CMD_OFFSET);
+
+	time_left = wait_for_completion_timeout(&dev->done, time_left);
+
+	/* disable all interrupts */
+	writel(0, dev->base + IE_OFFSET);
+
+	if (!time_left) {
+		dev_err(dev->device, "transaction times out\n");
+
+		/* flush FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+			(1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, dev->base + M_FIFO_CTRL_OFFSET);
+		return -EREMOTEIO;
+	}
+
+	ret = bcm_iproc_i2c_check_status(dev);
+	if (ret) {
+		/* flush both TX/RX FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+			(1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, dev->base + M_FIFO_CTRL_OFFSET);
+		return ret;
+	}
+
+	/*
+	 * For a read operation, we now need to load the data from FIFO
+	 * into the memory buffer
+	 */
+	if (msg->flags & I2C_M_RD) {
+		for (i = 0; i < msg->len; i++) {
+			msg->buf[i] = (readl(dev->base + M_RX_OFFSET) >>
+					M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
+		}
+	}
+
+	dev_dbg(dev->device, "xfer %c, addr=0x%02x, len=%d\n",
+			(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
+			msg->len);
+	dev_dbg(dev->device, "**** data start ****\n");
+	for (i = 0; i < msg->len; i++)
+		dev_dbg(dev->device, "0x%02x ",  msg->buf[i]);
+	dev_dbg(dev->device, "**** data end ****\n");
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
+			      struct i2c_msg msgs[], int num)
+{
+	struct bcm_iproc_i2c_dev *dev = i2c_get_adapdata(adapter);
+	int ret, i;
+
+	/* go through all messages */
+	for (i = 0; i < num; i++) {
+		ret = bcm_iproc_i2c_xfer_single_msg(dev, &msgs[i]);
+		if (ret) {
+			dev_err(dev->device, "xfer failed\n");
+			return ret;
+		}
+	}
+
+	return num;
+}
+
+static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm bcm_iproc_algo = {
+	.master_xfer = bcm_iproc_i2c_xfer,
+	.functionality = bcm_iproc_i2c_functionality,
+};
+
+static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *dev)
+{
+	unsigned int bus_speed, speed_bit;
+	u32 val;
+	int ret = of_property_read_u32(dev->device->of_node, "clock-frequency",
+				       &bus_speed);
+	if (ret < 0) {
+		dev_err(dev->device, "missing clock-frequency property\n");
+		return -ENODEV;
+	}
+
+	switch (bus_speed) {
+	case 100000:
+		speed_bit = 0;
+		break;
+	case 400000:
+		speed_bit = 1;
+		break;
+	default:
+		dev_err(dev->device, "%d Hz bus speed not supported\n",
+				bus_speed);
+		dev_err(dev->device, "valid speeds are 100khz and 400khz\n");
+		return -EINVAL;
+	}
+
+	val = readl(dev->base + TIM_CFG_OFFSET);
+	val &= ~(1 << TIME_CFG_MODE_400_SHIFT);
+	val |= speed_bit << TIME_CFG_MODE_400_SHIFT;
+	writel(val, dev->base + TIM_CFG_OFFSET);
+
+	dev_info(dev->device, "bus set to %u Hz\n", bus_speed);
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	/* put controller in reset */
+	val = readl(dev->base + CFG_OFFSET);
+	val |= 1 << CFG_RESET_SHIFT;
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, dev->base + CFG_OFFSET);
+
+	/* wait 100 usec per spec */
+	udelay(100);
+
+	/* bring controller out of reset */
+	val = readl(dev->base + CFG_OFFSET);
+	val &= ~(1 << CFG_RESET_SHIFT);
+	writel(val, dev->base + CFG_OFFSET);
+
+	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
+	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
+	writel(val, dev->base + M_FIFO_CTRL_OFFSET);
+
+	/* disable all interrupts */
+	val = 0;
+	writel(val, dev->base + IE_OFFSET);
+
+	/* clear all pending interrupts */
+	val = readl(dev->base + IS_OFFSET);
+	writel(val, dev->base + IS_OFFSET);
+
+	return 0;
+}
+
+static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	val = readl(dev->base + CFG_OFFSET);
+	val |= 1 << CFG_EN_SHIFT;
+	writel(val, dev->base + CFG_OFFSET);
+}
+
+static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	val = readl(dev->base + CFG_OFFSET);
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, dev->base + CFG_OFFSET);
+}
+
+static int bcm_iproc_i2c_probe(struct platform_device *pdev)
+{
+	int irq, ret = 0;
+	struct bcm_iproc_i2c_dev *dev;
+	struct i2c_adapter *adap;
+	struct resource *res;
+
+	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
+	if (!dev)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, dev);
+	dev->device = &pdev->dev;
+	init_completion(&dev->done);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	dev->base = devm_ioremap_resource(dev->device, res);
+	if (IS_ERR(dev->base))
+		return -ENOMEM;
+
+	ret = bcm_iproc_i2c_init(dev);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_cfg_speed(dev);
+	if (ret)
+		return ret;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		dev_err(dev->device, "no irq resource\n");
+		return irq;
+	}
+
+	ret = devm_request_irq(&pdev->dev, irq, bcm_iproc_i2c_isr,
+			IRQF_SHARED, pdev->name, dev);
+	if (ret) {
+		dev_err(dev->device, "unable to request irq %i\n", irq);
+		return ret;
+	}
+
+	bcm_iproc_i2c_enable(dev);
+
+	adap = &dev->adapter;
+	i2c_set_adapdata(adap, dev);
+	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
+	adap->algo = &bcm_iproc_algo;
+	adap->dev.parent = &pdev->dev;
+	adap->dev.of_node = pdev->dev.of_node;
+
+	ret = i2c_add_adapter(adap);
+	if (ret) {
+		dev_err(dev->device, "failed to add adapter\n");
+		return ret;
+	}
+
+	dev_info(dev->device, "device registered successfully\n");
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_remove(struct platform_device *pdev)
+{
+	struct bcm_iproc_i2c_dev *dev = platform_get_drvdata(pdev);
+
+	i2c_del_adapter(&dev->adapter);
+	bcm_iproc_i2c_disable(dev);
+
+	return 0;
+}
+
+static const struct of_device_id bcm_iproc_i2c_of_match[] = {
+	{.compatible = "brcm,iproc-i2c",},
+	{},
+};
+MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
+
+static struct platform_driver bcm_iproc_i2c_driver = {
+	.driver = {
+		   .name = "bcm-iproc-i2c",
+		   .of_match_table = bcm_iproc_i2c_of_match,
+		   },
+	.probe = bcm_iproc_i2c_probe,
+	.remove = bcm_iproc_i2c_remove,
+};
+module_platform_driver(bcm_iproc_i2c_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v3 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

Add initial support to the Broadcom iProc I2C controller found in the
iProc family of SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has
a size of 64 bytes. The iProc I2C controller supports two bus speeds
including standard mode (100kHz) and fast mode (400kHz)

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/i2c/busses/Kconfig         |   10 +
 drivers/i2c/busses/Makefile        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c |  500 ++++++++++++++++++++++++++++++++++++
 3 files changed, 511 insertions(+)
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index c1351d9..df21366 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -372,6 +372,16 @@ config I2C_BCM2835
 	  This support is also available as a module.  If so, the module
 	  will be called i2c-bcm2835.
 
+config I2C_BCM_IPROC
+	tristate "Broadcom iProc I2C controller"
+	depends on ARCH_BCM_IPROC
+	default y
+	help
+	  If you say yes to this option, support will be included for the
+	  Broadcom iProc I2C controller.
+
+	  If you don't know what to do here, say N.
+
 config I2C_BCM_KONA
 	tristate "BCM Kona I2C adapter"
 	depends on ARCH_BCM_MOBILE
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 5e6c822..216e7be 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
 obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
 obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
 obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
+obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
 obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
 obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
 obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
new file mode 100644
index 0000000..35ac497
--- /dev/null
+++ b/drivers/i2c/busses/i2c-bcm-iproc.c
@@ -0,0 +1,500 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+
+#define CFG_OFFSET                   0x00
+#define CFG_RESET_SHIFT              31
+#define CFG_EN_SHIFT                 30
+#define CFG_M_RETRY_CNT_SHIFT        16
+#define CFG_M_RETRY_CNT_MASK         0x0f
+
+#define TIM_CFG_OFFSET               0x04
+#define TIME_CFG_MODE_400_SHIFT      31
+
+#define M_FIFO_CTRL_OFFSET           0x0c
+#define M_FIFO_RX_FLUSH_SHIFT        31
+#define M_FIFO_TX_FLUSH_SHIFT        30
+#define M_FIFO_RX_CNT_SHIFT          16
+#define M_FIFO_RX_CNT_MASK           0x7f
+#define M_FIFO_RX_THLD_SHIFT         8
+#define M_FIFO_RX_THLD_MASK          0x3f
+
+#define M_CMD_OFFSET                 0x30
+#define M_CMD_START_BUSY_SHIFT       31
+#define M_CMD_STATUS_SHIFT           25
+#define M_CMD_STATUS_MASK            0x07
+#define M_CMD_STATUS_SUCCESS         0x0
+#define M_CMD_STATUS_LOST_ARB        0x1
+#define M_CMD_STATUS_NACK_ADDR       0x2
+#define M_CMD_STATUS_NACK_DATA       0x3
+#define M_CMD_STATUS_TIMEOUT         0x4
+#define M_CMD_PROTOCOL_SHIFT         9
+#define M_CMD_PROTOCOL_MASK          0xf
+#define M_CMD_PROTOCOL_BLK_WR        0x7
+#define M_CMD_PROTOCOL_BLK_RD        0x8
+#define M_CMD_PEC_SHIFT              8
+#define M_CMD_RD_CNT_SHIFT           0
+#define M_CMD_RD_CNT_MASK            0xff
+
+#define IE_OFFSET                    0x38
+#define IE_M_RX_FIFO_FULL_SHIFT      31
+#define IE_M_RX_THLD_SHIFT           30
+#define IE_M_START_BUSY_SHIFT        28
+
+#define IS_OFFSET                    0x3c
+#define IS_M_RX_FIFO_FULL_SHIFT      31
+#define IS_M_RX_THLD_SHIFT           30
+#define IS_M_START_BUSY_SHIFT        28
+
+#define M_TX_OFFSET                  0x40
+#define M_TX_WR_STATUS_SHIFT         31
+#define M_TX_DATA_SHIFT              0
+#define M_TX_DATA_MASK               0xff
+
+#define M_RX_OFFSET                  0x44
+#define M_RX_STATUS_SHIFT            30
+#define M_RX_STATUS_MASK             0x03
+#define M_RX_PEC_ERR_SHIFT           29
+#define M_RX_DATA_SHIFT              0
+#define M_RX_DATA_MASK               0xff
+
+#define I2C_TIMEOUT_MESC             100
+#define M_TX_RX_FIFO_SIZE            64
+
+enum bus_speed_index {
+	I2C_SPD_100K = 0,
+	I2C_SPD_400K,
+};
+
+struct bcm_iproc_i2c_dev {
+	struct device *device;
+
+	void __iomem *base;
+	struct i2c_msg *msg;
+
+	struct i2c_adapter adapter;
+
+	struct completion done;
+};
+
+/*
+ * Can be expanded in the future if more interrupt status bits are utilized
+ */
+#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
+
+static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
+{
+	struct bcm_iproc_i2c_dev *dev = data;
+	u32 status = readl(dev->base + IS_OFFSET);
+
+	status &= ISR_MASK;
+
+	if (!status)
+		return IRQ_NONE;
+
+	writel(status, dev->base + IS_OFFSET);
+	complete_all(&dev->done);
+
+	return IRQ_HANDLED;
+}
+
+static int __wait_for_bus_idle(struct bcm_iproc_i2c_dev *dev)
+{
+	unsigned long timeout = jiffies + msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	while (readl(dev->base + M_CMD_OFFSET) &
+			(1 << M_CMD_START_BUSY_SHIFT)) {
+		if (time_after(jiffies, timeout)) {
+			dev_err(dev->device, "wait for bus idle timeout\n");
+			return -ETIMEDOUT;
+		}
+	}
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *dev,
+				     struct i2c_msg *msg, u8 *addr)
+{
+
+	if (msg->flags & I2C_M_TEN) {
+		dev_err(dev->device, "no support for 10-bit address\n");
+		return -EINVAL;
+	}
+
+	*addr = (msg->addr << 1) & 0xfe;
+
+	if (msg->flags & I2C_M_RD)
+		*addr |= 1;
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	val = readl(dev->base + M_CMD_OFFSET);
+	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
+
+	switch (val) {
+	case M_CMD_STATUS_SUCCESS:
+		return 0;
+
+	case M_CMD_STATUS_LOST_ARB:
+		dev_err(dev->device, "lost bus arbitration\n");
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_NACK_ADDR:
+		dev_err(dev->device, "NAK addr:0x%02x\n", dev->msg->addr);
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_NACK_DATA:
+		dev_err(dev->device, "NAK data\n");
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_TIMEOUT:
+		dev_err(dev->device, "bus timeout\n");
+		return -ETIMEDOUT;
+
+	default:
+		dev_err(dev->device, "unknown error code=%d\n", val);
+		return -EREMOTEIO;
+	}
+
+	return -EREMOTEIO;
+}
+
+static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *dev,
+					 struct i2c_msg *msg)
+{
+	int ret, i;
+	u8 addr;
+	u32 val;
+	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	if (msg->len < 1 || msg->len > M_TX_RX_FIFO_SIZE - 1) {
+		dev_err(dev->device,
+			"supported data length is 1 - %u bytes\n",
+				M_TX_RX_FIFO_SIZE - 1);
+		return -EINVAL;
+	}
+
+	dev->msg = msg;
+	ret = __wait_for_bus_idle(dev);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_format_addr(dev, msg, &addr);
+	if (ret)
+		return ret;
+
+	/* load slave address into the TX FIFO */
+	writel(addr, dev->base + M_TX_OFFSET);
+
+	/* for a write transaction, load data into the TX FIFO */
+	if (!(msg->flags & I2C_M_RD)) {
+		for (i = 0; i < msg->len; i++) {
+			val = msg->buf[i];
+
+			/* mark the last byte */
+			if (i == msg->len - 1)
+				val |= 1 << M_TX_WR_STATUS_SHIFT;
+
+			writel(val, dev->base + M_TX_OFFSET);
+		}
+	}
+
+	/* mark as incomplete before starting the transaction */
+	reinit_completion(&dev->done);
+
+	/*
+	 * Enable the "start busy" interrupt, which will be triggered after
+	 * the transaction is done
+	 */
+	writel(1 << IE_M_START_BUSY_SHIFT, dev->base + IE_OFFSET);
+
+	/*
+	 * Now we can activate the transfer. For a read operation, specify the
+	 * number of bytes to read
+	 */
+	val = 1 << M_CMD_START_BUSY_SHIFT;
+	if (msg->flags & I2C_M_RD) {
+		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
+			(msg->len << M_CMD_RD_CNT_SHIFT);
+	} else {
+		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
+	}
+	writel(val, dev->base + M_CMD_OFFSET);
+
+	time_left = wait_for_completion_timeout(&dev->done, time_left);
+
+	/* disable all interrupts */
+	writel(0, dev->base + IE_OFFSET);
+
+	if (!time_left) {
+		dev_err(dev->device, "transaction times out\n");
+
+		/* flush FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+			(1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, dev->base + M_FIFO_CTRL_OFFSET);
+		return -EREMOTEIO;
+	}
+
+	ret = bcm_iproc_i2c_check_status(dev);
+	if (ret) {
+		/* flush both TX/RX FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+			(1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, dev->base + M_FIFO_CTRL_OFFSET);
+		return ret;
+	}
+
+	/*
+	 * For a read operation, we now need to load the data from FIFO
+	 * into the memory buffer
+	 */
+	if (msg->flags & I2C_M_RD) {
+		for (i = 0; i < msg->len; i++) {
+			msg->buf[i] = (readl(dev->base + M_RX_OFFSET) >>
+					M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
+		}
+	}
+
+	dev_dbg(dev->device, "xfer %c, addr=0x%02x, len=%d\n",
+			(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
+			msg->len);
+	dev_dbg(dev->device, "**** data start ****\n");
+	for (i = 0; i < msg->len; i++)
+		dev_dbg(dev->device, "0x%02x ",  msg->buf[i]);
+	dev_dbg(dev->device, "**** data end ****\n");
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
+			      struct i2c_msg msgs[], int num)
+{
+	struct bcm_iproc_i2c_dev *dev = i2c_get_adapdata(adapter);
+	int ret, i;
+
+	/* go through all messages */
+	for (i = 0; i < num; i++) {
+		ret = bcm_iproc_i2c_xfer_single_msg(dev, &msgs[i]);
+		if (ret) {
+			dev_err(dev->device, "xfer failed\n");
+			return ret;
+		}
+	}
+
+	return num;
+}
+
+static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm bcm_iproc_algo = {
+	.master_xfer = bcm_iproc_i2c_xfer,
+	.functionality = bcm_iproc_i2c_functionality,
+};
+
+static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *dev)
+{
+	unsigned int bus_speed, speed_bit;
+	u32 val;
+	int ret = of_property_read_u32(dev->device->of_node, "clock-frequency",
+				       &bus_speed);
+	if (ret < 0) {
+		dev_err(dev->device, "missing clock-frequency property\n");
+		return -ENODEV;
+	}
+
+	switch (bus_speed) {
+	case 100000:
+		speed_bit = 0;
+		break;
+	case 400000:
+		speed_bit = 1;
+		break;
+	default:
+		dev_err(dev->device, "%d Hz bus speed not supported\n",
+				bus_speed);
+		dev_err(dev->device, "valid speeds are 100khz and 400khz\n");
+		return -EINVAL;
+	}
+
+	val = readl(dev->base + TIM_CFG_OFFSET);
+	val &= ~(1 << TIME_CFG_MODE_400_SHIFT);
+	val |= speed_bit << TIME_CFG_MODE_400_SHIFT;
+	writel(val, dev->base + TIM_CFG_OFFSET);
+
+	dev_info(dev->device, "bus set to %u Hz\n", bus_speed);
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	/* put controller in reset */
+	val = readl(dev->base + CFG_OFFSET);
+	val |= 1 << CFG_RESET_SHIFT;
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, dev->base + CFG_OFFSET);
+
+	/* wait 100 usec per spec */
+	udelay(100);
+
+	/* bring controller out of reset */
+	val = readl(dev->base + CFG_OFFSET);
+	val &= ~(1 << CFG_RESET_SHIFT);
+	writel(val, dev->base + CFG_OFFSET);
+
+	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
+	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
+	writel(val, dev->base + M_FIFO_CTRL_OFFSET);
+
+	/* disable all interrupts */
+	val = 0;
+	writel(val, dev->base + IE_OFFSET);
+
+	/* clear all pending interrupts */
+	val = readl(dev->base + IS_OFFSET);
+	writel(val, dev->base + IS_OFFSET);
+
+	return 0;
+}
+
+static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	val = readl(dev->base + CFG_OFFSET);
+	val |= 1 << CFG_EN_SHIFT;
+	writel(val, dev->base + CFG_OFFSET);
+}
+
+static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *dev)
+{
+	u32 val;
+
+	val = readl(dev->base + CFG_OFFSET);
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, dev->base + CFG_OFFSET);
+}
+
+static int bcm_iproc_i2c_probe(struct platform_device *pdev)
+{
+	int irq, ret = 0;
+	struct bcm_iproc_i2c_dev *dev;
+	struct i2c_adapter *adap;
+	struct resource *res;
+
+	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
+	if (!dev)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, dev);
+	dev->device = &pdev->dev;
+	init_completion(&dev->done);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	dev->base = devm_ioremap_resource(dev->device, res);
+	if (IS_ERR(dev->base))
+		return -ENOMEM;
+
+	ret = bcm_iproc_i2c_init(dev);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_cfg_speed(dev);
+	if (ret)
+		return ret;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		dev_err(dev->device, "no irq resource\n");
+		return irq;
+	}
+
+	ret = devm_request_irq(&pdev->dev, irq, bcm_iproc_i2c_isr,
+			IRQF_SHARED, pdev->name, dev);
+	if (ret) {
+		dev_err(dev->device, "unable to request irq %i\n", irq);
+		return ret;
+	}
+
+	bcm_iproc_i2c_enable(dev);
+
+	adap = &dev->adapter;
+	i2c_set_adapdata(adap, dev);
+	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
+	adap->algo = &bcm_iproc_algo;
+	adap->dev.parent = &pdev->dev;
+	adap->dev.of_node = pdev->dev.of_node;
+
+	ret = i2c_add_adapter(adap);
+	if (ret) {
+		dev_err(dev->device, "failed to add adapter\n");
+		return ret;
+	}
+
+	dev_info(dev->device, "device registered successfully\n");
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_remove(struct platform_device *pdev)
+{
+	struct bcm_iproc_i2c_dev *dev = platform_get_drvdata(pdev);
+
+	i2c_del_adapter(&dev->adapter);
+	bcm_iproc_i2c_disable(dev);
+
+	return 0;
+}
+
+static const struct of_device_id bcm_iproc_i2c_of_match[] = {
+	{.compatible = "brcm,iproc-i2c",},
+	{},
+};
+MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
+
+static struct platform_driver bcm_iproc_i2c_driver = {
+	.driver = {
+		   .name = "bcm-iproc-i2c",
+		   .of_match_table = bcm_iproc_i2c_of_match,
+		   },
+	.probe = bcm_iproc_i2c_probe,
+	.remove = bcm_iproc_i2c_remove,
+};
+module_platform_driver(bcm_iproc_i2c_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v3 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
them disabled there. Individual I2C devices can be enabled in board
specific dts file when I2C slave devices are enabled in the future

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..f7d6c1d 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -70,6 +70,26 @@
 		};
 	};
 
+	i2c0: i2c@18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
+	i2c1: i2c@1800b000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x1800b000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 86 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
 	uart0: serial@18020000 {
 		compatible = "snps,dw-apb-uart";
 		reg = <0x18020000 0x100>;
-- 
1.7.9.5

[PATCH v3 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
them disabled there. Individual I2C devices can be enabled in board
specific dts file when I2C slave devices are enabled in the future

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..f7d6c1d 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -70,6 +70,26 @@
 		};
 	};
 
+	i2c0: i2c@18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
+	i2c1: i2c@1800b000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x1800b000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 86 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
 	uart0: serial@18020000 {
 		compatible = "snps,dw-apb-uart";
 		reg = <0x18020000 0x100>;
-- 
1.7.9.5

[PATCH v3 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
them disabled there. Individual I2C devices can be enabled in board
specific dts file when I2C slave devices are enabled in the future

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..f7d6c1d 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -70,6 +70,26 @@
 		};
 	};
 
+	i2c0: i2c at 18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
+	i2c1: i2c at 1800b000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x1800b000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 86 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
 	uart0: serial at 18020000 {
 		compatible = "snps,dw-apb-uart";
 		reg = <0x18020000 0x100>;
-- 
1.7.9.5

Re: [PATCH v2 3/4] ARM: mach-bcm: Enable I2C support for iProc

[Ray Jui]

On 12/9/2014 7:20 PM, Florian Fainelli wrote:
> On 09/12/14 18:24, Ray Jui wrote:
>>
>>
>> On 12/9/2014 6:20 PM, Florian Fainelli wrote:
>>> On 09/12/14 18:18, Ray Jui wrote:
>>>> Enable I2C driver support for Broadcom iProc family of SoCs by
>>>> selecting I2C_BCM_IPROC
>>>>
>>>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>>>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>>>> ---
>>>>    arch/arm/mach-bcm/Kconfig |    1 +
>>>>    1 file changed, 1 insertion(+)
>>>>
>>>> diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
>>>> index aaeec78..86ee90b 100644
>>>> --- a/arch/arm/mach-bcm/Kconfig
>>>> +++ b/arch/arm/mach-bcm/Kconfig
>>>> @@ -19,6 +19,7 @@ config ARCH_BCM_IPROC
>>>>        select ARCH_REQUIRE_GPIOLIB
>>>>        select ARM_AMBA
>>>>        select PINCTRL
>>>> +    select I2C_BCM_IPROC
>>>
>>> One way to avoid having to modify mach-bcm/Kconfig would be to have your
>>> i2c driver Kconfig do this:
>>>
>>> default ARCH_BCM_IPROC
>>>
>>> would that work?
>>>
>> Yes. So in which case it is better to select a driver from the
>> architecture specific Kconfig?
>
> I suppose if your driver/subsystem is critical for system boot, like
> powering a regulator or something that has a critical purpose, a select
> is probably more appropriate here. If this is just exposing non-critical
> devices, I would go with a depends on/default at the driver Kconfig level.
>
> This is just how I see things, others would definitively have a
> different view.
>
Okay. Thanks. I default the driver to y in patchset v3 just like some 
other I2C drivers in the same Kconfig. It already depends on 
ARCH_BCM_IPROC so it makes sense to set the default to y, i.e., it will 
be enabled by default for ARCH_BCM_IPROC platforms.

>>
>>>>        help
>>>>          This enables support for systems based on Broadcom IPROC
>>>> architected SoCs.
>>>>          The IPROC complex contains one or more ARM CPUs along with
>>>> common
>>>>
>>>
>

Re: [PATCH v2 3/4] ARM: mach-bcm: Enable I2C support for iProc

[Ray Jui]

On 12/9/2014 7:20 PM, Florian Fainelli wrote:
> On 09/12/14 18:24, Ray Jui wrote:
>>
>>
>> On 12/9/2014 6:20 PM, Florian Fainelli wrote:
>>> On 09/12/14 18:18, Ray Jui wrote:
>>>> Enable I2C driver support for Broadcom iProc family of SoCs by
>>>> selecting I2C_BCM_IPROC
>>>>
>>>> Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>>>> Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>>>> ---
>>>>    arch/arm/mach-bcm/Kconfig |    1 +
>>>>    1 file changed, 1 insertion(+)
>>>>
>>>> diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
>>>> index aaeec78..86ee90b 100644
>>>> --- a/arch/arm/mach-bcm/Kconfig
>>>> +++ b/arch/arm/mach-bcm/Kconfig
>>>> @@ -19,6 +19,7 @@ config ARCH_BCM_IPROC
>>>>        select ARCH_REQUIRE_GPIOLIB
>>>>        select ARM_AMBA
>>>>        select PINCTRL
>>>> +    select I2C_BCM_IPROC
>>>
>>> One way to avoid having to modify mach-bcm/Kconfig would be to have your
>>> i2c driver Kconfig do this:
>>>
>>> default ARCH_BCM_IPROC
>>>
>>> would that work?
>>>
>> Yes. So in which case it is better to select a driver from the
>> architecture specific Kconfig?
>
> I suppose if your driver/subsystem is critical for system boot, like
> powering a regulator or something that has a critical purpose, a select
> is probably more appropriate here. If this is just exposing non-critical
> devices, I would go with a depends on/default at the driver Kconfig level.
>
> This is just how I see things, others would definitively have a
> different view.
>
Okay. Thanks. I default the driver to y in patchset v3 just like some 
other I2C drivers in the same Kconfig. It already depends on 
ARCH_BCM_IPROC so it makes sense to set the default to y, i.e., it will 
be enabled by default for ARCH_BCM_IPROC platforms.

>>
>>>>        help
>>>>          This enables support for systems based on Broadcom IPROC
>>>> architected SoCs.
>>>>          The IPROC complex contains one or more ARM CPUs along with
>>>> common
>>>>
>>>
>

[PATCH v2 3/4] ARM: mach-bcm: Enable I2C support for iProc

[Ray Jui]

On 12/9/2014 7:20 PM, Florian Fainelli wrote:
> On 09/12/14 18:24, Ray Jui wrote:
>>
>>
>> On 12/9/2014 6:20 PM, Florian Fainelli wrote:
>>> On 09/12/14 18:18, Ray Jui wrote:
>>>> Enable I2C driver support for Broadcom iProc family of SoCs by
>>>> selecting I2C_BCM_IPROC
>>>>
>>>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>>>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>>>> ---
>>>>    arch/arm/mach-bcm/Kconfig |    1 +
>>>>    1 file changed, 1 insertion(+)
>>>>
>>>> diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
>>>> index aaeec78..86ee90b 100644
>>>> --- a/arch/arm/mach-bcm/Kconfig
>>>> +++ b/arch/arm/mach-bcm/Kconfig
>>>> @@ -19,6 +19,7 @@ config ARCH_BCM_IPROC
>>>>        select ARCH_REQUIRE_GPIOLIB
>>>>        select ARM_AMBA
>>>>        select PINCTRL
>>>> +    select I2C_BCM_IPROC
>>>
>>> One way to avoid having to modify mach-bcm/Kconfig would be to have your
>>> i2c driver Kconfig do this:
>>>
>>> default ARCH_BCM_IPROC
>>>
>>> would that work?
>>>
>> Yes. So in which case it is better to select a driver from the
>> architecture specific Kconfig?
>
> I suppose if your driver/subsystem is critical for system boot, like
> powering a regulator or something that has a critical purpose, a select
> is probably more appropriate here. If this is just exposing non-critical
> devices, I would go with a depends on/default at the driver Kconfig level.
>
> This is just how I see things, others would definitively have a
> different view.
>
Okay. Thanks. I default the driver to y in patchset v3 just like some 
other I2C drivers in the same Kconfig. It already depends on 
ARCH_BCM_IPROC so it makes sense to set the default to y, i.e., it will 
be enabled by default for ARCH_BCM_IPROC platforms.

>>
>>>>        help
>>>>          This enables support for systems based on Broadcom IPROC
>>>> architected SoCs.
>>>>          The IPROC complex contains one or more ARM CPUs along with
>>>> common
>>>>
>>>
>

Re: [PATCH 1/4] pci: iProc: define Broadcom iProc PCIe binding

[Lucas Stach]

Am Dienstag, den 09.12.2014, 16:04 -0800 schrieb Ray Jui:
> Document the PCIe device tree binding for Broadcom iProc family of SoCs
> 
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> ---
>  .../devicetree/bindings/pci/brcm,iproc-pcie.txt    |   62 ++++++++++++++++++++
>  1 file changed, 62 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
> 
> diff --git a/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
> new file mode 100644
> index 0000000..2467628
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
> @@ -0,0 +1,62 @@
> +* Broadcom iProc PCIe controller
> +
> +Required properties:
> +- compatible: Must be "brcm,iproc-pcie"
> +- reg: base address and length of the PCIe controller and the MDIO interface
> +  that controls the PCIe PHY
> +- interrupts: interrupt IDs
> +- bus-range: PCI bus numbers covered
> +- #address-cells: set to <3>
> +- #size-cells: set to <2>
> +- device_type: set to "pci"
> +- ranges: ranges for the PCI memory and I/O regions
> +- phy-addr: MDC/MDIO adddress of the PCIe PHY
> +- have-msi-inten-reg: Required for legacy iProc PCIe controllers that need the
> +  MSI interrupt enable register to be set explicitly
> +
> +The Broadcom iProc PCie driver adapts the multi-domain structure, i.e., each
> +interface has its own domain and therefore has its own device node
> +Example:
> +
> +SoC specific DT Entry:
> +
> +	pcie0: pcie@18012000 {
> +		compatible = "brcm,iproc-pcie";
> +		reg = <0x18012000 0x1000>,
> +			<0x18002000 0x1000>;
> +		interrupts = <GIC_SPI 96 IRQ_TYPE_NONE>,
> +			     <GIC_SPI 97 IRQ_TYPE_NONE>,
> +			     <GIC_SPI 98 IRQ_TYPE_NONE>,
> +			     <GIC_SPI 99 IRQ_TYPE_NONE>,
> +			     <GIC_SPI 100 IRQ_TYPE_NONE>,
> +			     <GIC_SPI 101 IRQ_TYPE_NONE>;

This is missing the interrupt-map and interrupt-map-mask for the legacy
INTx interrupts. If you add this you don't need to have a special map
function in your driver, but can just use the standard
of_irq_parse_and_map_pci() function.

Regards,
Lucas

> +		bus-range = <0x00 0xFF>;
> +
> +		#address-cells = <3>;
> +		#size-cells = <2>;
> +		device_type = "pci";
> +		ranges = <0x81000000 0 0	  0x28000000 0 0x00010000   /* downstream I/O */
> +			  0x82000000 0 0x20000000 0x20000000 0 0x04000000>; /* non-prefetchable memory */
> +		phy-addr = <5>;
> +	};
> +
> +	pcie1: pcie@18013000 {
> +		compatible = "brcm,iproc-pcie";
> +		reg = <0x18013000 0x1000>,
> +			<0x18002000 0x1000>;
> +
> +		interrupts = <GIC_SPI 102 IRQ_TYPE_NONE>,
> +			     <GIC_SPI 103 IRQ_TYPE_NONE>,
> +			     <GIC_SPI 104 IRQ_TYPE_NONE>,
> +			     <GIC_SPI 105 IRQ_TYPE_NONE>,
> +			     <GIC_SPI 106 IRQ_TYPE_NONE>,
> +			     <GIC_SPI 107 IRQ_TYPE_NONE>;
> +		bus-range = <0x00 0xFF>;
> +
> +		#address-cells = <3>;
> +		#size-cells = <2>;
> +		device_type = "pci";
> +		ranges = <0x81000000 0 0	  0x48000000 0 0x00010000   /* downstream I/O */
> +			  0x82000000 0 0x40000000 0x40000000 0 0x04000000>; /* non-prefetchable memory */
> +		phy-addr = <6>;
> +	};

-- 
Pengutronix e.K.             | Lucas Stach                 |
Industrial Linux Solutions   | http://www.pengutronix.de/  |

[PATCH 1/4] pci: iProc: define Broadcom iProc PCIe binding

[Lucas Stach]

Am Dienstag, den 09.12.2014, 16:04 -0800 schrieb Ray Jui:
> Document the PCIe device tree binding for Broadcom iProc family of SoCs
> 
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> ---
>  .../devicetree/bindings/pci/brcm,iproc-pcie.txt    |   62 ++++++++++++++++++++
>  1 file changed, 62 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
> 
> diff --git a/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
> new file mode 100644
> index 0000000..2467628
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
> @@ -0,0 +1,62 @@
> +* Broadcom iProc PCIe controller
> +
> +Required properties:
> +- compatible: Must be "brcm,iproc-pcie"
> +- reg: base address and length of the PCIe controller and the MDIO interface
> +  that controls the PCIe PHY
> +- interrupts: interrupt IDs
> +- bus-range: PCI bus numbers covered
> +- #address-cells: set to <3>
> +- #size-cells: set to <2>
> +- device_type: set to "pci"
> +- ranges: ranges for the PCI memory and I/O regions
> +- phy-addr: MDC/MDIO adddress of the PCIe PHY
> +- have-msi-inten-reg: Required for legacy iProc PCIe controllers that need the
> +  MSI interrupt enable register to be set explicitly
> +
> +The Broadcom iProc PCie driver adapts the multi-domain structure, i.e., each
> +interface has its own domain and therefore has its own device node
> +Example:
> +
> +SoC specific DT Entry:
> +
> +	pcie0: pcie at 18012000 {
> +		compatible = "brcm,iproc-pcie";
> +		reg = <0x18012000 0x1000>,
> +			<0x18002000 0x1000>;
> +		interrupts = <GIC_SPI 96 IRQ_TYPE_NONE>,
> +			     <GIC_SPI 97 IRQ_TYPE_NONE>,
> +			     <GIC_SPI 98 IRQ_TYPE_NONE>,
> +			     <GIC_SPI 99 IRQ_TYPE_NONE>,
> +			     <GIC_SPI 100 IRQ_TYPE_NONE>,
> +			     <GIC_SPI 101 IRQ_TYPE_NONE>;

This is missing the interrupt-map and interrupt-map-mask for the legacy
INTx interrupts. If you add this you don't need to have a special map
function in your driver, but can just use the standard
of_irq_parse_and_map_pci() function.

Regards,
Lucas

> +		bus-range = <0x00 0xFF>;
> +
> +		#address-cells = <3>;
> +		#size-cells = <2>;
> +		device_type = "pci";
> +		ranges = <0x81000000 0 0	  0x28000000 0 0x00010000   /* downstream I/O */
> +			  0x82000000 0 0x20000000 0x20000000 0 0x04000000>; /* non-prefetchable memory */
> +		phy-addr = <5>;
> +	};
> +
> +	pcie1: pcie at 18013000 {
> +		compatible = "brcm,iproc-pcie";
> +		reg = <0x18013000 0x1000>,
> +			<0x18002000 0x1000>;
> +
> +		interrupts = <GIC_SPI 102 IRQ_TYPE_NONE>,
> +			     <GIC_SPI 103 IRQ_TYPE_NONE>,
> +			     <GIC_SPI 104 IRQ_TYPE_NONE>,
> +			     <GIC_SPI 105 IRQ_TYPE_NONE>,
> +			     <GIC_SPI 106 IRQ_TYPE_NONE>,
> +			     <GIC_SPI 107 IRQ_TYPE_NONE>;
> +		bus-range = <0x00 0xFF>;
> +
> +		#address-cells = <3>;
> +		#size-cells = <2>;
> +		device_type = "pci";
> +		ranges = <0x81000000 0 0	  0x48000000 0 0x00010000   /* downstream I/O */
> +			  0x82000000 0 0x40000000 0x40000000 0 0x04000000>; /* non-prefetchable memory */
> +		phy-addr = <6>;
> +	};

-- 
Pengutronix e.K.             | Lucas Stach                 |
Industrial Linux Solutions   | http://www.pengutronix.de/  |

Re: [PATCH v4 2/5] gpio: Cygnus: add GPIO driver

[Alexandre Courbot]

On Tue, Dec 9, 2014 at 5:41 AM, Ray Jui <rjui@broadcom.com> wrote:
> This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
> SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller, 2) the
> chipCommonG GPIO controller, and 3) the ALWAYS-ON GPIO controller
>
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> ---
>  drivers/gpio/Kconfig           |   11 +
>  drivers/gpio/Makefile          |    1 +
>  drivers/gpio/gpio-bcm-cygnus.c |  705 ++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 717 insertions(+)
>  create mode 100644 drivers/gpio/gpio-bcm-cygnus.c
>
> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> index 633ec21..3e3b0342 100644
> --- a/drivers/gpio/Kconfig
> +++ b/drivers/gpio/Kconfig
> @@ -126,6 +126,17 @@ config GPIO_74XX_MMIO
>             8 bits:     74244 (Input), 74273 (Output)
>             16 bits:    741624 (Input), 7416374 (Output)
>
> +config GPIO_BCM_CYGNUS
> +       bool "Broadcom Cygnus GPIO support"
> +       depends on ARCH_BCM_CYGNUS && OF_GPIO
> +       help
> +         Say yes here to turn on GPIO support for Broadcom Cygnus SoC
> +
> +         The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
> +         GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
> +         the always-ON GPIO controller (CRMU). All 3 GPIO controllers are
> +         supported by this driver
> +
>  config GPIO_CLPS711X
>         tristate "CLPS711X GPIO support"
>         depends on ARCH_CLPS711X || COMPILE_TEST
> diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
> index 81755f1..31eb7e0 100644
> --- a/drivers/gpio/Makefile
> +++ b/drivers/gpio/Makefile
> @@ -19,6 +19,7 @@ obj-$(CONFIG_GPIO_ADP5520)    += gpio-adp5520.o
>  obj-$(CONFIG_GPIO_ADP5588)     += gpio-adp5588.o
>  obj-$(CONFIG_GPIO_AMD8111)     += gpio-amd8111.o
>  obj-$(CONFIG_GPIO_ARIZONA)     += gpio-arizona.o
> +obj-$(CONFIG_GPIO_BCM_CYGNUS)  += gpio-bcm-cygnus.o
>  obj-$(CONFIG_GPIO_BCM_KONA)    += gpio-bcm-kona.o
>  obj-$(CONFIG_GPIO_BT8XX)       += gpio-bt8xx.o
>  obj-$(CONFIG_GPIO_CLPS711X)    += gpio-clps711x.o
> diff --git a/drivers/gpio/gpio-bcm-cygnus.c b/drivers/gpio/gpio-bcm-cygnus.c
> new file mode 100644
> index 0000000..4fd9b73
> --- /dev/null
> +++ b/drivers/gpio/gpio-bcm-cygnus.c
> @@ -0,0 +1,705 @@
> +/*
> + * Copyright (C) 2014 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/slab.h>
> +#include <linux/module.h>
> +#include <linux/irq.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/gpio.h>
> +#include <linux/ioport.h>
> +#include <linux/of_device.h>
> +#include <linux/of_irq.h>
> +#include <linux/irqchip/chained_irq.h>
> +
> +#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
> +#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
> +#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
> +#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
> +#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
> +#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
> +#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
> +#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
> +#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
> +#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
> +#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
> +#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
> +
> +/* drive strength control for ASIU GPIO */
> +#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
> +
> +/* drive strength control for CCM GPIO */
> +#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00
> +
> +#define GPIO_BANK_SIZE 0x200
> +#define NGPIOS_PER_BANK 32
> +#define GPIO_BIT(pin) ((pin) % NGPIOS_PER_BANK)
> +#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
> +
> +#define GPIO_FLAG_BIT_MASK           0xffff
> +#define GPIO_PULL_BIT_SHIFT          16
> +#define GPIO_PULL_BIT_MASK           0x3
> +
> +#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
> +#define GPIO_DRV_STRENGTH_BITS       3
> +#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
> +
> +/*
> + * For GPIO internal pull up/down registers
> + */
> +enum gpio_pull {
> +       GPIO_PULL_NONE = 0,
> +       GPIO_PULL_UP,
> +       GPIO_PULL_DOWN,
> +       GPIO_PULL_INVALID,
> +};
> +
> +/*
> + * GPIO drive strength
> + */
> +enum gpio_drv_strength {
> +       GPIO_DRV_STRENGTH_2MA = 0,
> +       GPIO_DRV_STRENGTH_4MA,
> +       GPIO_DRV_STRENGTH_6MA,
> +       GPIO_DRV_STRENGTH_8MA,
> +       GPIO_DRV_STRENGTH_10MA,
> +       GPIO_DRV_STRENGTH_12MA,
> +       GPIO_DRV_STRENGTH_14MA,
> +       GPIO_DRV_STRENGTH_16MA,
> +       GPIO_DRV_STRENGTH_INVALID,
> +};
> +
> +struct bcm_cygnus_gpio {
> +       struct device *dev;
> +       void __iomem *base;
> +       void __iomem *io_ctrl;
> +       spinlock_t lock;
> +       struct gpio_chip gc;
> +       unsigned num_banks;
> +       int irq;
> +       struct irq_domain *irq_domain;
> +};
> +
> +static unsigned int gpio_base_index;

Nope. What happens if there are other GPIO controllers with
conflicting base GPIOs? I guess this adds more weight to that
"linux,gpio-base" property I mentioned in
http://www.spinics.net/lists/arm-kernel/msg384847.html .

The best solution would be for users of the GPIOs provided by this
driver to not rely on GPIO numbers at all, and exclusively use the
gpiod interface. Is that an option for you?

> +
> +static struct bcm_cygnus_gpio *to_bcm_cygnus_gpio(struct gpio_chip *gc)
> +{
> +       return container_of(gc, struct bcm_cygnus_gpio, gc);
> +}
> +
> +static int bcm_cygnus_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
> +{
> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
> +
> +       return irq_find_mapping(cygnus_gpio->irq_domain, offset);
> +}
> +
> +static unsigned int __gpio_reg_offset(struct bcm_cygnus_gpio *cygnus_gpio,
> +               unsigned gpio)
> +{
> +       return GPIO_BANK(gpio) * GPIO_BANK_SIZE;
> +}

The cygnus_gpio argument in this function is unused. The compiler is
supposed to signal such issues. Have you looked at your compiler
output?

> +
> +static unsigned int __gpio_bitpos(struct bcm_cygnus_gpio *cygnus_gpio,
> +               unsigned gpio)
> +{
> +       return GPIO_BIT(gpio);
> +}

Same here. Also they are so simple that macros would be more adequate
here I believe:

#define CYGNUS_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + reg)
#define CYGNUS_GPIO_SHIFT(pin) (pin % NGPIOS_PER_BANK) /* and remove
the GPIO_BIT macro */

> +
> +static void bcm_cygnus_gpio_irq_handler(unsigned int irq,
> +               struct irq_desc *desc)
> +{
> +       struct bcm_cygnus_gpio *cygnus_gpio;
> +       struct irq_chip *chip = irq_desc_get_chip(desc);
> +       int i, bit;
> +
> +       chained_irq_enter(chip, desc);
> +
> +       cygnus_gpio = irq_get_handler_data(irq);
> +
> +       /* go through the entire GPIO banks and handle all interrupts */
> +       for (i = 0; i < cygnus_gpio->num_banks; i++) {
> +               unsigned long val = readl(cygnus_gpio->base +
> +                               (i * GPIO_BANK_SIZE) +
> +                               CYGNUS_GPIO_INT_MSTAT_OFFSET);

Can you add cygnus_readl() and cygnus_writel() functions to avoid
explicitly doing this operation on cygnus_gpio->base every time? It
would be clearer and less error-prone.

> +
> +               for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
> +                       unsigned pin = NGPIOS_PER_BANK * i + bit;
> +                       int child_irq =
> +                               bcm_cygnus_gpio_to_irq(&cygnus_gpio->gc, pin);
> +
> +                       /*
> +                        * Clear the interrupt before invoking the
> +                        * handler, so we do not leave any window
> +                        */
> +                       writel(1 << bit,
> +                               cygnus_gpio->base + (i * GPIO_BANK_SIZE) +
> +                               CYGNUS_GPIO_INT_CLR_OFFSET);
> +
> +                       generic_handle_irq(child_irq);
> +               }
> +       }
> +
> +       chained_irq_exit(chip, desc);
> +}
> +
> +static void bcm_cygnus_gpio_irq_ack(struct irq_data *d)
> +{
> +       struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
> +       unsigned gpio = d->hwirq;
> +       unsigned int offset, shift;
> +       u32 val;
> +
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_INT_CLR_OFFSET;
> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
> +
> +       val = 1 << shift;

val = BIT(shift);

> +       writel(val, cygnus_gpio->base + offset);
> +
> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
> +                       offset, shift);
> +}
> +
> +static void bcm_cygnus_gpio_irq_mask(struct irq_data *d)
> +{
> +       struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
> +       unsigned gpio = d->hwirq;
> +       unsigned int offset, shift;
> +       u32 val;
> +       unsigned long flags;
> +
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_INT_MSK_OFFSET;
> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
> +
> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
> +
> +       val = readl(cygnus_gpio->base + offset);
> +       val &= ~(1 << shift);

val &= ~BIT(shift);

> +       writel(val, cygnus_gpio->base + offset);
> +
> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
> +
> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
> +                       offset, shift);
> +}
> +
> +static void bcm_cygnus_gpio_irq_unmask(struct irq_data *d)
> +{
> +       struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
> +       unsigned gpio = d->hwirq;
> +       unsigned int offset, shift;
> +       u32 val;
> +       unsigned long flags;
> +
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_INT_MSK_OFFSET;
> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
> +
> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
> +
> +       val = readl(cygnus_gpio->base + offset);
> +       val |= 1 << shift;

val |= BIT(shift);

Same remark everywhere it applies in this file.

> +       writel(val, cygnus_gpio->base + offset);
> +
> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
> +
> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
> +                       offset, shift);
> +}

It seems like you can factorize bcm_cygnus_gpio_irq_mask() and
bcm_cygnus_gpio_irq_unmask() into one function which prototype would
be, say:

static void bcm_cygnus_gpio_irq_set_mask(struct irq_data *d, int mask);

which would set of clear the bit according to the value of mask. Then
your two mask/unmask functions would just need to call this one,
reducing the amount of redundant code.

Also I noticed that this driver has lots of readl()/twiddle
bit/writel() sequences. Maybe it would make sense to have a
cygnus_set_bit(chip, reg, gpio, set) function to factorize this:

void cygnus_set_bit(chip, reg, gpio, set)
{
    unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
    unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
    u32 val;

    val = cygnus_readl(chip, offset);
    if (set)
        val |= BIT(shift);
    else
        val &= ~BIT(shift);
    cygnus_writel(chip, offset, val);
}

> +
> +static int bcm_cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
> +{
> +       struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
> +       unsigned gpio = d->hwirq;
> +       unsigned int int_type, dual_edge, edge_lvl;
> +       unsigned int offset, shift;
> +       u32 val;
> +       unsigned long flags;
> +
> +       switch (type & IRQ_TYPE_SENSE_MASK) {
> +       case IRQ_TYPE_EDGE_RISING:
> +               int_type = 0;
> +               dual_edge = 0;
> +               edge_lvl = 1;
> +               break;
> +
> +       case IRQ_TYPE_EDGE_FALLING:
> +               int_type = 0;
> +               dual_edge = 0;
> +               edge_lvl = 0;
> +               break;
> +
> +       case IRQ_TYPE_EDGE_BOTH:
> +               int_type = 0;
> +               dual_edge = 1;
> +               edge_lvl = 0;
> +               break;
> +
> +       case IRQ_TYPE_LEVEL_HIGH:
> +               int_type = 1;
> +               dual_edge = 0;
> +               edge_lvl = 1;
> +               break;
> +
> +       case IRQ_TYPE_LEVEL_LOW:
> +               int_type = 1;
> +               dual_edge = 0;
> +               edge_lvl = 0;
> +               break;
> +
> +       default:
> +               dev_err(cygnus_gpio->dev, "invalid GPIO irq type 0x%x\n", type);
> +               return -EINVAL;
> +       }
> +
> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
> +
> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_IN_TYPE_OFFSET;
> +       val = readl(cygnus_gpio->base + offset);
> +       val &= ~(1 << shift);
> +       val |= int_type << shift;
> +       writel(val, cygnus_gpio->base + offset);
> +
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_INT_DE_OFFSET;
> +       val = readl(cygnus_gpio->base + offset);
> +       val &= ~(1 << shift);
> +       val |= dual_edge << shift;
> +       writel(val, cygnus_gpio->base + offset);
> +
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_INT_EDGE_OFFSET;
> +       val = readl(cygnus_gpio->base + offset);
> +       val &= ~(1 << shift);
> +       val |= edge_lvl << shift;
> +       writel(val, cygnus_gpio->base + offset);

With the functions/macros suggested above I think you could change the
3 blocks above into something like:

cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_IN_TYPE_OFFSET, gpio, int_type);
cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_INT_DE_OFFSET, gpio, dual_edge);
cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_INT_EDGE_OFFSET, gpio, edge_lvl);

> +
> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
> +
> +       return 0;
> +}
> +
> +static struct irq_chip bcm_cygnus_gpio_irq_chip = {
> +       .name = "bcm-cygnus-gpio",
> +       .irq_ack = bcm_cygnus_gpio_irq_ack,
> +       .irq_mask = bcm_cygnus_gpio_irq_mask,
> +       .irq_unmask = bcm_cygnus_gpio_irq_unmask,
> +       .irq_set_type = bcm_cygnus_gpio_irq_set_type,
> +};
> +
> +static int bcm_cygnus_gpio_direction_input(struct gpio_chip *gc,
> +               unsigned gpio)
> +{
> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
> +       unsigned int offset, shift;
> +       u32 val;
> +       unsigned long flags;
> +
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_OUT_EN_OFFSET;
> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
> +
> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
> +
> +       val = readl(cygnus_gpio->base + offset);
> +       val &= ~(1 << shift);
> +       writel(val, cygnus_gpio->base + offset);
> +
> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
> +
> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
> +                       offset, shift);
> +
> +       return 0;
> +}
> +
> +static int bcm_cygnus_gpio_direction_output(struct gpio_chip *gc,
> +               unsigned gpio, int value)
> +{
> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
> +       unsigned int offset, shift;
> +       u32 val;
> +       unsigned long flags;
> +
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_OUT_EN_OFFSET;
> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
> +
> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
> +
> +       val = readl(cygnus_gpio->base + offset);
> +       val |= 1 << shift;
> +       writel(val, cygnus_gpio->base + offset);
> +
> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
> +                       offset, shift);
> +
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_DATA_OUT_OFFSET;
> +
> +       val = readl(cygnus_gpio->base + offset);
> +       if (value)
> +               val |= 1 << shift;
> +       else
> +               val &= ~(1 << shift);
> +       writel(val, cygnus_gpio->base + offset);

And here you would have:

cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 1);
cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);

Many other sites in this file could be simplified this way.

> +
> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
> +
> +       dev_dbg(cygnus_gpio->dev,
> +               "gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
> +               gpio, offset, shift, val);
> +
> +       return 0;
> +}
> +
> +static void bcm_cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio,
> +               int value)
> +{
> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
> +       unsigned int offset, shift;
> +       u32 val;
> +       unsigned long flags;
> +
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_DATA_OUT_OFFSET;
> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
> +
> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
> +
> +       val = readl(cygnus_gpio->base + offset);
> +       if (value)
> +               val |= 1 << shift;
> +       else
> +               val &= ~(1 << shift);
> +       writel(val, cygnus_gpio->base + offset);
> +
> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
> +
> +       dev_dbg(cygnus_gpio->dev,
> +               "gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
> +               gpio, offset, shift, val);
> +}
> +
> +static int bcm_cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
> +{
> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
> +       unsigned int offset, shift;
> +       u32 val;
> +
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_DATA_IN_OFFSET;
> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
> +
> +       val = readl(cygnus_gpio->base + offset);
> +       val = (val >> shift) & 1;
> +
> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u val:%u\n",
> +                       gpio, offset, shift, val);
> +
> +       return val;
> +}
> +
> +static struct lock_class_key gpio_lock_class;
> +
> +static int bcm_cygnus_gpio_irq_map(struct irq_domain *d, unsigned int irq,
> +                                irq_hw_number_t hwirq)
> +{
> +       int ret;
> +
> +       ret = irq_set_chip_data(irq, d->host_data);
> +       if (ret < 0)
> +               return ret;
> +       irq_set_lockdep_class(irq, &gpio_lock_class);
> +       irq_set_chip_and_handler(irq, &bcm_cygnus_gpio_irq_chip,
> +                       handle_simple_irq);
> +       set_irq_flags(irq, IRQF_VALID);
> +
> +       return 0;
> +}
> +
> +static void bcm_cygnus_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
> +{
> +       irq_set_chip_and_handler(irq, NULL, NULL);
> +       irq_set_chip_data(irq, NULL);
> +}
> +
> +static struct irq_domain_ops bcm_cygnus_irq_ops = {
> +       .map = bcm_cygnus_gpio_irq_map,
> +       .unmap = bcm_cygnus_gpio_irq_unmap,
> +       .xlate = irq_domain_xlate_twocell,
> +};
> +
> +#ifdef CONFIG_OF_GPIO
> +static void bcm_cygnus_gpio_set_pull(struct bcm_cygnus_gpio *cygnus_gpio,
> +               unsigned gpio, enum gpio_pull pull)
> +{
> +       unsigned int offset, shift;
> +       u32 val, pullup;
> +       unsigned long flags;
> +
> +       switch (pull) {
> +       case GPIO_PULL_UP:
> +               pullup = 1;
> +               break;
> +       case GPIO_PULL_DOWN:
> +               pullup = 0;
> +               break;
> +       case GPIO_PULL_NONE:
> +       case GPIO_PULL_INVALID:
> +       default:
> +               return;
> +       }
> +
> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
> +
> +       /* set pull up/down */
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_PAD_RES_OFFSET;
> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
> +
> +       val = readl(cygnus_gpio->base + offset);
> +       val &= ~(1 << shift);
> +       if (pullup)
> +               val |= 1 << shift;
> +       writel(val, cygnus_gpio->base + offset);
> +
> +       /* enable pad */
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_RES_EN_OFFSET;
> +       val = readl(cygnus_gpio->base + offset);
> +       val |= 1 << shift;
> +       writel(val, cygnus_gpio->base + offset);
> +
> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
> +}
> +
> +static void bcm_cygnus_gpio_set_strength(struct bcm_cygnus_gpio *cygnus_gpio,
> +               unsigned gpio, enum gpio_drv_strength strength)
> +{
> +       struct device *dev = cygnus_gpio->dev;
> +       void __iomem *base;
> +       unsigned int i, offset, shift;
> +       u32 val;
> +       unsigned long flags;
> +
> +       /* some GPIO controllers do not support drive strength configuration */
> +       if (of_find_property(dev->of_node, "no-drv-strength", NULL))
> +               return;
> +
> +       if (cygnus_gpio->io_ctrl) {
> +               base = cygnus_gpio->io_ctrl;
> +               offset = CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET;
> +       } else {
> +               base = cygnus_gpio->base;
> +               offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +                       CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET;
> +       }
> +
> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
> +
> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
> +
> +       for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
> +               val = readl(base + offset);
> +               val &= ~(1 << shift);
> +               val |= ((strength >> i) & 0x1) << shift;
> +               writel(val, base + offset);
> +               offset += 4;
> +       }
> +
> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
> +}
> +
> +static int bcm_cygnus_gpio_of_xlate(struct gpio_chip *gc,
> +               const struct of_phandle_args *gpiospec, u32 *flags)
> +{
> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
> +       enum gpio_pull pull;
> +       enum gpio_drv_strength strength;
> +
> +       if (gc->of_gpio_n_cells < 2)
> +               return -EINVAL;
> +
> +       if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
> +               return -EINVAL;
> +
> +       if (gpiospec->args[0] >= gc->ngpio)
> +               return -EINVAL;
> +
> +       pull = (gpiospec->args[1] >> GPIO_PULL_BIT_SHIFT) & GPIO_PULL_BIT_MASK;
> +       if (WARN_ON(pull >= GPIO_PULL_INVALID))
> +               return -EINVAL;
> +
> +       strength = (gpiospec->args[1] >> GPIO_DRV_STRENGTH_BIT_SHIFT) &
> +               GPIO_DRV_STRENGTH_BIT_MASK;
> +
> +       if (flags)
> +               *flags = gpiospec->args[1] & GPIO_FLAG_BIT_MASK;
> +
> +       bcm_cygnus_gpio_set_pull(cygnus_gpio, gpiospec->args[0], pull);
> +       bcm_cygnus_gpio_set_strength(cygnus_gpio, gpiospec->args[0], strength);
> +
> +       return gpiospec->args[0];
> +}
> +#endif
> +
> +static const struct of_device_id bcm_cygnus_gpio_of_match[] = {
> +       { .compatible = "brcm,cygnus-gpio" },
> +       { }
> +};
> +MODULE_DEVICE_TABLE(of, bcm_cygnus_gpio_of_match);
> +
> +static int bcm_cygnus_gpio_probe(struct platform_device *pdev)
> +{
> +       struct device *dev = &pdev->dev;
> +       const struct of_device_id *match;
> +       struct resource *res;
> +       struct bcm_cygnus_gpio *cygnus_gpio;
> +       struct gpio_chip *gc;
> +       u32 i, ngpios;
> +       int ret;
> +
> +       match = of_match_device(bcm_cygnus_gpio_of_match, dev);
> +       if (!match) {
> +               dev_err(&pdev->dev, "failed to find GPIO controller\n");
> +               return -ENODEV;
> +       }

Do you still need that block of code? match is never used in this function.

... well, I think you get the drill. Let's first start by factorizing
as much code as can be to make this driver easier to read (I have a
few leads, but I am sure there are other similar factorizations that
can be made). Let's also get rid of this static gpio_base_index
variable that effectively prevents any other GPIO driver from being
used alongside with this one. If you really need to use global GPIO
numbers, let's see if Linus agrees for that "linux,gpio-base" DT
property that would certainly make many people happy.

Re: [PATCH v4 2/5] gpio: Cygnus: add GPIO driver

[Alexandre Courbot]

On Tue, Dec 9, 2014 at 5:41 AM, Ray Jui <rjui@broadcom.com> wrote:
> This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
> SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller, 2) the
> chipCommonG GPIO controller, and 3) the ALWAYS-ON GPIO controller
>
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> ---
>  drivers/gpio/Kconfig           |   11 +
>  drivers/gpio/Makefile          |    1 +
>  drivers/gpio/gpio-bcm-cygnus.c |  705 ++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 717 insertions(+)
>  create mode 100644 drivers/gpio/gpio-bcm-cygnus.c
>
> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> index 633ec21..3e3b0342 100644
> --- a/drivers/gpio/Kconfig
> +++ b/drivers/gpio/Kconfig
> @@ -126,6 +126,17 @@ config GPIO_74XX_MMIO
>             8 bits:     74244 (Input), 74273 (Output)
>             16 bits:    741624 (Input), 7416374 (Output)
>
> +config GPIO_BCM_CYGNUS
> +       bool "Broadcom Cygnus GPIO support"
> +       depends on ARCH_BCM_CYGNUS && OF_GPIO
> +       help
> +         Say yes here to turn on GPIO support for Broadcom Cygnus SoC
> +
> +         The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
> +         GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
> +         the always-ON GPIO controller (CRMU). All 3 GPIO controllers are
> +         supported by this driver
> +
>  config GPIO_CLPS711X
>         tristate "CLPS711X GPIO support"
>         depends on ARCH_CLPS711X || COMPILE_TEST
> diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
> index 81755f1..31eb7e0 100644
> --- a/drivers/gpio/Makefile
> +++ b/drivers/gpio/Makefile
> @@ -19,6 +19,7 @@ obj-$(CONFIG_GPIO_ADP5520)    += gpio-adp5520.o
>  obj-$(CONFIG_GPIO_ADP5588)     += gpio-adp5588.o
>  obj-$(CONFIG_GPIO_AMD8111)     += gpio-amd8111.o
>  obj-$(CONFIG_GPIO_ARIZONA)     += gpio-arizona.o
> +obj-$(CONFIG_GPIO_BCM_CYGNUS)  += gpio-bcm-cygnus.o
>  obj-$(CONFIG_GPIO_BCM_KONA)    += gpio-bcm-kona.o
>  obj-$(CONFIG_GPIO_BT8XX)       += gpio-bt8xx.o
>  obj-$(CONFIG_GPIO_CLPS711X)    += gpio-clps711x.o
> diff --git a/drivers/gpio/gpio-bcm-cygnus.c b/drivers/gpio/gpio-bcm-cygnus.c
> new file mode 100644
> index 0000000..4fd9b73
> --- /dev/null
> +++ b/drivers/gpio/gpio-bcm-cygnus.c
> @@ -0,0 +1,705 @@
> +/*
> + * Copyright (C) 2014 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/slab.h>
> +#include <linux/module.h>
> +#include <linux/irq.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/gpio.h>
> +#include <linux/ioport.h>
> +#include <linux/of_device.h>
> +#include <linux/of_irq.h>
> +#include <linux/irqchip/chained_irq.h>
> +
> +#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
> +#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
> +#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
> +#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
> +#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
> +#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
> +#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
> +#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
> +#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
> +#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
> +#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
> +#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
> +
> +/* drive strength control for ASIU GPIO */
> +#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
> +
> +/* drive strength control for CCM GPIO */
> +#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00
> +
> +#define GPIO_BANK_SIZE 0x200
> +#define NGPIOS_PER_BANK 32
> +#define GPIO_BIT(pin) ((pin) % NGPIOS_PER_BANK)
> +#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
> +
> +#define GPIO_FLAG_BIT_MASK           0xffff
> +#define GPIO_PULL_BIT_SHIFT          16
> +#define GPIO_PULL_BIT_MASK           0x3
> +
> +#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
> +#define GPIO_DRV_STRENGTH_BITS       3
> +#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
> +
> +/*
> + * For GPIO internal pull up/down registers
> + */
> +enum gpio_pull {
> +       GPIO_PULL_NONE = 0,
> +       GPIO_PULL_UP,
> +       GPIO_PULL_DOWN,
> +       GPIO_PULL_INVALID,
> +};
> +
> +/*
> + * GPIO drive strength
> + */
> +enum gpio_drv_strength {
> +       GPIO_DRV_STRENGTH_2MA = 0,
> +       GPIO_DRV_STRENGTH_4MA,
> +       GPIO_DRV_STRENGTH_6MA,
> +       GPIO_DRV_STRENGTH_8MA,
> +       GPIO_DRV_STRENGTH_10MA,
> +       GPIO_DRV_STRENGTH_12MA,
> +       GPIO_DRV_STRENGTH_14MA,
> +       GPIO_DRV_STRENGTH_16MA,
> +       GPIO_DRV_STRENGTH_INVALID,
> +};
> +
> +struct bcm_cygnus_gpio {
> +       struct device *dev;
> +       void __iomem *base;
> +       void __iomem *io_ctrl;
> +       spinlock_t lock;
> +       struct gpio_chip gc;
> +       unsigned num_banks;
> +       int irq;
> +       struct irq_domain *irq_domain;
> +};
> +
> +static unsigned int gpio_base_index;

Nope. What happens if there are other GPIO controllers with
conflicting base GPIOs? I guess this adds more weight to that
"linux,gpio-base" property I mentioned in
http://www.spinics.net/lists/arm-kernel/msg384847.html .

The best solution would be for users of the GPIOs provided by this
driver to not rely on GPIO numbers at all, and exclusively use the
gpiod interface. Is that an option for you?

> +
> +static struct bcm_cygnus_gpio *to_bcm_cygnus_gpio(struct gpio_chip *gc)
> +{
> +       return container_of(gc, struct bcm_cygnus_gpio, gc);
> +}
> +
> +static int bcm_cygnus_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
> +{
> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
> +
> +       return irq_find_mapping(cygnus_gpio->irq_domain, offset);
> +}
> +
> +static unsigned int __gpio_reg_offset(struct bcm_cygnus_gpio *cygnus_gpio,
> +               unsigned gpio)
> +{
> +       return GPIO_BANK(gpio) * GPIO_BANK_SIZE;
> +}

The cygnus_gpio argument in this function is unused. The compiler is
supposed to signal such issues. Have you looked at your compiler
output?

> +
> +static unsigned int __gpio_bitpos(struct bcm_cygnus_gpio *cygnus_gpio,
> +               unsigned gpio)
> +{
> +       return GPIO_BIT(gpio);
> +}

Same here. Also they are so simple that macros would be more adequate
here I believe:

#define CYGNUS_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + reg)
#define CYGNUS_GPIO_SHIFT(pin) (pin % NGPIOS_PER_BANK) /* and remove
the GPIO_BIT macro */

> +
> +static void bcm_cygnus_gpio_irq_handler(unsigned int irq,
> +               struct irq_desc *desc)
> +{
> +       struct bcm_cygnus_gpio *cygnus_gpio;
> +       struct irq_chip *chip = irq_desc_get_chip(desc);
> +       int i, bit;
> +
> +       chained_irq_enter(chip, desc);
> +
> +       cygnus_gpio = irq_get_handler_data(irq);
> +
> +       /* go through the entire GPIO banks and handle all interrupts */
> +       for (i = 0; i < cygnus_gpio->num_banks; i++) {
> +               unsigned long val = readl(cygnus_gpio->base +
> +                               (i * GPIO_BANK_SIZE) +
> +                               CYGNUS_GPIO_INT_MSTAT_OFFSET);

Can you add cygnus_readl() and cygnus_writel() functions to avoid
explicitly doing this operation on cygnus_gpio->base every time? It
would be clearer and less error-prone.

> +
> +               for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
> +                       unsigned pin = NGPIOS_PER_BANK * i + bit;
> +                       int child_irq =
> +                               bcm_cygnus_gpio_to_irq(&cygnus_gpio->gc, pin);
> +
> +                       /*
> +                        * Clear the interrupt before invoking the
> +                        * handler, so we do not leave any window
> +                        */
> +                       writel(1 << bit,
> +                               cygnus_gpio->base + (i * GPIO_BANK_SIZE) +
> +                               CYGNUS_GPIO_INT_CLR_OFFSET);
> +
> +                       generic_handle_irq(child_irq);
> +               }
> +       }
> +
> +       chained_irq_exit(chip, desc);
> +}
> +
> +static void bcm_cygnus_gpio_irq_ack(struct irq_data *d)
> +{
> +       struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
> +       unsigned gpio = d->hwirq;
> +       unsigned int offset, shift;
> +       u32 val;
> +
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_INT_CLR_OFFSET;
> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
> +
> +       val = 1 << shift;

val = BIT(shift);

> +       writel(val, cygnus_gpio->base + offset);
> +
> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
> +                       offset, shift);
> +}
> +
> +static void bcm_cygnus_gpio_irq_mask(struct irq_data *d)
> +{
> +       struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
> +       unsigned gpio = d->hwirq;
> +       unsigned int offset, shift;
> +       u32 val;
> +       unsigned long flags;
> +
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_INT_MSK_OFFSET;
> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
> +
> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
> +
> +       val = readl(cygnus_gpio->base + offset);
> +       val &= ~(1 << shift);

val &= ~BIT(shift);

> +       writel(val, cygnus_gpio->base + offset);
> +
> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
> +
> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
> +                       offset, shift);
> +}
> +
> +static void bcm_cygnus_gpio_irq_unmask(struct irq_data *d)
> +{
> +       struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
> +       unsigned gpio = d->hwirq;
> +       unsigned int offset, shift;
> +       u32 val;
> +       unsigned long flags;
> +
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_INT_MSK_OFFSET;
> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
> +
> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
> +
> +       val = readl(cygnus_gpio->base + offset);
> +       val |= 1 << shift;

val |= BIT(shift);

Same remark everywhere it applies in this file.

> +       writel(val, cygnus_gpio->base + offset);
> +
> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
> +
> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
> +                       offset, shift);
> +}

It seems like you can factorize bcm_cygnus_gpio_irq_mask() and
bcm_cygnus_gpio_irq_unmask() into one function which prototype would
be, say:

static void bcm_cygnus_gpio_irq_set_mask(struct irq_data *d, int mask);

which would set of clear the bit according to the value of mask. Then
your two mask/unmask functions would just need to call this one,
reducing the amount of redundant code.

Also I noticed that this driver has lots of readl()/twiddle
bit/writel() sequences. Maybe it would make sense to have a
cygnus_set_bit(chip, reg, gpio, set) function to factorize this:

void cygnus_set_bit(chip, reg, gpio, set)
{
    unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
    unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
    u32 val;

    val = cygnus_readl(chip, offset);
    if (set)
        val |= BIT(shift);
    else
        val &= ~BIT(shift);
    cygnus_writel(chip, offset, val);
}

> +
> +static int bcm_cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
> +{
> +       struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
> +       unsigned gpio = d->hwirq;
> +       unsigned int int_type, dual_edge, edge_lvl;
> +       unsigned int offset, shift;
> +       u32 val;
> +       unsigned long flags;
> +
> +       switch (type & IRQ_TYPE_SENSE_MASK) {
> +       case IRQ_TYPE_EDGE_RISING:
> +               int_type = 0;
> +               dual_edge = 0;
> +               edge_lvl = 1;
> +               break;
> +
> +       case IRQ_TYPE_EDGE_FALLING:
> +               int_type = 0;
> +               dual_edge = 0;
> +               edge_lvl = 0;
> +               break;
> +
> +       case IRQ_TYPE_EDGE_BOTH:
> +               int_type = 0;
> +               dual_edge = 1;
> +               edge_lvl = 0;
> +               break;
> +
> +       case IRQ_TYPE_LEVEL_HIGH:
> +               int_type = 1;
> +               dual_edge = 0;
> +               edge_lvl = 1;
> +               break;
> +
> +       case IRQ_TYPE_LEVEL_LOW:
> +               int_type = 1;
> +               dual_edge = 0;
> +               edge_lvl = 0;
> +               break;
> +
> +       default:
> +               dev_err(cygnus_gpio->dev, "invalid GPIO irq type 0x%x\n", type);
> +               return -EINVAL;
> +       }
> +
> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
> +
> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_IN_TYPE_OFFSET;
> +       val = readl(cygnus_gpio->base + offset);
> +       val &= ~(1 << shift);
> +       val |= int_type << shift;
> +       writel(val, cygnus_gpio->base + offset);
> +
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_INT_DE_OFFSET;
> +       val = readl(cygnus_gpio->base + offset);
> +       val &= ~(1 << shift);
> +       val |= dual_edge << shift;
> +       writel(val, cygnus_gpio->base + offset);
> +
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_INT_EDGE_OFFSET;
> +       val = readl(cygnus_gpio->base + offset);
> +       val &= ~(1 << shift);
> +       val |= edge_lvl << shift;
> +       writel(val, cygnus_gpio->base + offset);

With the functions/macros suggested above I think you could change the
3 blocks above into something like:

cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_IN_TYPE_OFFSET, gpio, int_type);
cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_INT_DE_OFFSET, gpio, dual_edge);
cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_INT_EDGE_OFFSET, gpio, edge_lvl);

> +
> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
> +
> +       return 0;
> +}
> +
> +static struct irq_chip bcm_cygnus_gpio_irq_chip = {
> +       .name = "bcm-cygnus-gpio",
> +       .irq_ack = bcm_cygnus_gpio_irq_ack,
> +       .irq_mask = bcm_cygnus_gpio_irq_mask,
> +       .irq_unmask = bcm_cygnus_gpio_irq_unmask,
> +       .irq_set_type = bcm_cygnus_gpio_irq_set_type,
> +};
> +
> +static int bcm_cygnus_gpio_direction_input(struct gpio_chip *gc,
> +               unsigned gpio)
> +{
> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
> +       unsigned int offset, shift;
> +       u32 val;
> +       unsigned long flags;
> +
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_OUT_EN_OFFSET;
> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
> +
> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
> +
> +       val = readl(cygnus_gpio->base + offset);
> +       val &= ~(1 << shift);
> +       writel(val, cygnus_gpio->base + offset);
> +
> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
> +
> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
> +                       offset, shift);
> +
> +       return 0;
> +}
> +
> +static int bcm_cygnus_gpio_direction_output(struct gpio_chip *gc,
> +               unsigned gpio, int value)
> +{
> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
> +       unsigned int offset, shift;
> +       u32 val;
> +       unsigned long flags;
> +
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_OUT_EN_OFFSET;
> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
> +
> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
> +
> +       val = readl(cygnus_gpio->base + offset);
> +       val |= 1 << shift;
> +       writel(val, cygnus_gpio->base + offset);
> +
> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
> +                       offset, shift);
> +
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_DATA_OUT_OFFSET;
> +
> +       val = readl(cygnus_gpio->base + offset);
> +       if (value)
> +               val |= 1 << shift;
> +       else
> +               val &= ~(1 << shift);
> +       writel(val, cygnus_gpio->base + offset);

And here you would have:

cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 1);
cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);

Many other sites in this file could be simplified this way.

> +
> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
> +
> +       dev_dbg(cygnus_gpio->dev,
> +               "gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
> +               gpio, offset, shift, val);
> +
> +       return 0;
> +}
> +
> +static void bcm_cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio,
> +               int value)
> +{
> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
> +       unsigned int offset, shift;
> +       u32 val;
> +       unsigned long flags;
> +
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_DATA_OUT_OFFSET;
> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
> +
> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
> +
> +       val = readl(cygnus_gpio->base + offset);
> +       if (value)
> +               val |= 1 << shift;
> +       else
> +               val &= ~(1 << shift);
> +       writel(val, cygnus_gpio->base + offset);
> +
> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
> +
> +       dev_dbg(cygnus_gpio->dev,
> +               "gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
> +               gpio, offset, shift, val);
> +}
> +
> +static int bcm_cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
> +{
> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
> +       unsigned int offset, shift;
> +       u32 val;
> +
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_DATA_IN_OFFSET;
> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
> +
> +       val = readl(cygnus_gpio->base + offset);
> +       val = (val >> shift) & 1;
> +
> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u val:%u\n",
> +                       gpio, offset, shift, val);
> +
> +       return val;
> +}
> +
> +static struct lock_class_key gpio_lock_class;
> +
> +static int bcm_cygnus_gpio_irq_map(struct irq_domain *d, unsigned int irq,
> +                                irq_hw_number_t hwirq)
> +{
> +       int ret;
> +
> +       ret = irq_set_chip_data(irq, d->host_data);
> +       if (ret < 0)
> +               return ret;
> +       irq_set_lockdep_class(irq, &gpio_lock_class);
> +       irq_set_chip_and_handler(irq, &bcm_cygnus_gpio_irq_chip,
> +                       handle_simple_irq);
> +       set_irq_flags(irq, IRQF_VALID);
> +
> +       return 0;
> +}
> +
> +static void bcm_cygnus_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
> +{
> +       irq_set_chip_and_handler(irq, NULL, NULL);
> +       irq_set_chip_data(irq, NULL);
> +}
> +
> +static struct irq_domain_ops bcm_cygnus_irq_ops = {
> +       .map = bcm_cygnus_gpio_irq_map,
> +       .unmap = bcm_cygnus_gpio_irq_unmap,
> +       .xlate = irq_domain_xlate_twocell,
> +};
> +
> +#ifdef CONFIG_OF_GPIO
> +static void bcm_cygnus_gpio_set_pull(struct bcm_cygnus_gpio *cygnus_gpio,
> +               unsigned gpio, enum gpio_pull pull)
> +{
> +       unsigned int offset, shift;
> +       u32 val, pullup;
> +       unsigned long flags;
> +
> +       switch (pull) {
> +       case GPIO_PULL_UP:
> +               pullup = 1;
> +               break;
> +       case GPIO_PULL_DOWN:
> +               pullup = 0;
> +               break;
> +       case GPIO_PULL_NONE:
> +       case GPIO_PULL_INVALID:
> +       default:
> +               return;
> +       }
> +
> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
> +
> +       /* set pull up/down */
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_PAD_RES_OFFSET;
> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
> +
> +       val = readl(cygnus_gpio->base + offset);
> +       val &= ~(1 << shift);
> +       if (pullup)
> +               val |= 1 << shift;
> +       writel(val, cygnus_gpio->base + offset);
> +
> +       /* enable pad */
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_RES_EN_OFFSET;
> +       val = readl(cygnus_gpio->base + offset);
> +       val |= 1 << shift;
> +       writel(val, cygnus_gpio->base + offset);
> +
> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
> +}
> +
> +static void bcm_cygnus_gpio_set_strength(struct bcm_cygnus_gpio *cygnus_gpio,
> +               unsigned gpio, enum gpio_drv_strength strength)
> +{
> +       struct device *dev = cygnus_gpio->dev;
> +       void __iomem *base;
> +       unsigned int i, offset, shift;
> +       u32 val;
> +       unsigned long flags;
> +
> +       /* some GPIO controllers do not support drive strength configuration */
> +       if (of_find_property(dev->of_node, "no-drv-strength", NULL))
> +               return;
> +
> +       if (cygnus_gpio->io_ctrl) {
> +               base = cygnus_gpio->io_ctrl;
> +               offset = CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET;
> +       } else {
> +               base = cygnus_gpio->base;
> +               offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +                       CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET;
> +       }
> +
> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
> +
> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
> +
> +       for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
> +               val = readl(base + offset);
> +               val &= ~(1 << shift);
> +               val |= ((strength >> i) & 0x1) << shift;
> +               writel(val, base + offset);
> +               offset += 4;
> +       }
> +
> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
> +}
> +
> +static int bcm_cygnus_gpio_of_xlate(struct gpio_chip *gc,
> +               const struct of_phandle_args *gpiospec, u32 *flags)
> +{
> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
> +       enum gpio_pull pull;
> +       enum gpio_drv_strength strength;
> +
> +       if (gc->of_gpio_n_cells < 2)
> +               return -EINVAL;
> +
> +       if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
> +               return -EINVAL;
> +
> +       if (gpiospec->args[0] >= gc->ngpio)
> +               return -EINVAL;
> +
> +       pull = (gpiospec->args[1] >> GPIO_PULL_BIT_SHIFT) & GPIO_PULL_BIT_MASK;
> +       if (WARN_ON(pull >= GPIO_PULL_INVALID))
> +               return -EINVAL;
> +
> +       strength = (gpiospec->args[1] >> GPIO_DRV_STRENGTH_BIT_SHIFT) &
> +               GPIO_DRV_STRENGTH_BIT_MASK;
> +
> +       if (flags)
> +               *flags = gpiospec->args[1] & GPIO_FLAG_BIT_MASK;
> +
> +       bcm_cygnus_gpio_set_pull(cygnus_gpio, gpiospec->args[0], pull);
> +       bcm_cygnus_gpio_set_strength(cygnus_gpio, gpiospec->args[0], strength);
> +
> +       return gpiospec->args[0];
> +}
> +#endif
> +
> +static const struct of_device_id bcm_cygnus_gpio_of_match[] = {
> +       { .compatible = "brcm,cygnus-gpio" },
> +       { }
> +};
> +MODULE_DEVICE_TABLE(of, bcm_cygnus_gpio_of_match);
> +
> +static int bcm_cygnus_gpio_probe(struct platform_device *pdev)
> +{
> +       struct device *dev = &pdev->dev;
> +       const struct of_device_id *match;
> +       struct resource *res;
> +       struct bcm_cygnus_gpio *cygnus_gpio;
> +       struct gpio_chip *gc;
> +       u32 i, ngpios;
> +       int ret;
> +
> +       match = of_match_device(bcm_cygnus_gpio_of_match, dev);
> +       if (!match) {
> +               dev_err(&pdev->dev, "failed to find GPIO controller\n");
> +               return -ENODEV;
> +       }

Do you still need that block of code? match is never used in this function.

... well, I think you get the drill. Let's first start by factorizing
as much code as can be to make this driver easier to read (I have a
few leads, but I am sure there are other similar factorizations that
can be made). Let's also get rid of this static gpio_base_index
variable that effectively prevents any other GPIO driver from being
used alongside with this one. If you really need to use global GPIO
numbers, let's see if Linus agrees for that "linux,gpio-base" DT
property that would certainly make many people happy.

[PATCH v4 2/5] gpio: Cygnus: add GPIO driver

[Alexandre Courbot]

On Tue, Dec 9, 2014 at 5:41 AM, Ray Jui <rjui@broadcom.com> wrote:
> This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
> SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller, 2) the
> chipCommonG GPIO controller, and 3) the ALWAYS-ON GPIO controller
>
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> ---
>  drivers/gpio/Kconfig           |   11 +
>  drivers/gpio/Makefile          |    1 +
>  drivers/gpio/gpio-bcm-cygnus.c |  705 ++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 717 insertions(+)
>  create mode 100644 drivers/gpio/gpio-bcm-cygnus.c
>
> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> index 633ec21..3e3b0342 100644
> --- a/drivers/gpio/Kconfig
> +++ b/drivers/gpio/Kconfig
> @@ -126,6 +126,17 @@ config GPIO_74XX_MMIO
>             8 bits:     74244 (Input), 74273 (Output)
>             16 bits:    741624 (Input), 7416374 (Output)
>
> +config GPIO_BCM_CYGNUS
> +       bool "Broadcom Cygnus GPIO support"
> +       depends on ARCH_BCM_CYGNUS && OF_GPIO
> +       help
> +         Say yes here to turn on GPIO support for Broadcom Cygnus SoC
> +
> +         The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
> +         GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
> +         the always-ON GPIO controller (CRMU). All 3 GPIO controllers are
> +         supported by this driver
> +
>  config GPIO_CLPS711X
>         tristate "CLPS711X GPIO support"
>         depends on ARCH_CLPS711X || COMPILE_TEST
> diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
> index 81755f1..31eb7e0 100644
> --- a/drivers/gpio/Makefile
> +++ b/drivers/gpio/Makefile
> @@ -19,6 +19,7 @@ obj-$(CONFIG_GPIO_ADP5520)    += gpio-adp5520.o
>  obj-$(CONFIG_GPIO_ADP5588)     += gpio-adp5588.o
>  obj-$(CONFIG_GPIO_AMD8111)     += gpio-amd8111.o
>  obj-$(CONFIG_GPIO_ARIZONA)     += gpio-arizona.o
> +obj-$(CONFIG_GPIO_BCM_CYGNUS)  += gpio-bcm-cygnus.o
>  obj-$(CONFIG_GPIO_BCM_KONA)    += gpio-bcm-kona.o
>  obj-$(CONFIG_GPIO_BT8XX)       += gpio-bt8xx.o
>  obj-$(CONFIG_GPIO_CLPS711X)    += gpio-clps711x.o
> diff --git a/drivers/gpio/gpio-bcm-cygnus.c b/drivers/gpio/gpio-bcm-cygnus.c
> new file mode 100644
> index 0000000..4fd9b73
> --- /dev/null
> +++ b/drivers/gpio/gpio-bcm-cygnus.c
> @@ -0,0 +1,705 @@
> +/*
> + * Copyright (C) 2014 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/slab.h>
> +#include <linux/module.h>
> +#include <linux/irq.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/gpio.h>
> +#include <linux/ioport.h>
> +#include <linux/of_device.h>
> +#include <linux/of_irq.h>
> +#include <linux/irqchip/chained_irq.h>
> +
> +#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
> +#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
> +#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
> +#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
> +#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
> +#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
> +#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
> +#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
> +#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
> +#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
> +#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
> +#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
> +
> +/* drive strength control for ASIU GPIO */
> +#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
> +
> +/* drive strength control for CCM GPIO */
> +#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00
> +
> +#define GPIO_BANK_SIZE 0x200
> +#define NGPIOS_PER_BANK 32
> +#define GPIO_BIT(pin) ((pin) % NGPIOS_PER_BANK)
> +#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
> +
> +#define GPIO_FLAG_BIT_MASK           0xffff
> +#define GPIO_PULL_BIT_SHIFT          16
> +#define GPIO_PULL_BIT_MASK           0x3
> +
> +#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
> +#define GPIO_DRV_STRENGTH_BITS       3
> +#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
> +
> +/*
> + * For GPIO internal pull up/down registers
> + */
> +enum gpio_pull {
> +       GPIO_PULL_NONE = 0,
> +       GPIO_PULL_UP,
> +       GPIO_PULL_DOWN,
> +       GPIO_PULL_INVALID,
> +};
> +
> +/*
> + * GPIO drive strength
> + */
> +enum gpio_drv_strength {
> +       GPIO_DRV_STRENGTH_2MA = 0,
> +       GPIO_DRV_STRENGTH_4MA,
> +       GPIO_DRV_STRENGTH_6MA,
> +       GPIO_DRV_STRENGTH_8MA,
> +       GPIO_DRV_STRENGTH_10MA,
> +       GPIO_DRV_STRENGTH_12MA,
> +       GPIO_DRV_STRENGTH_14MA,
> +       GPIO_DRV_STRENGTH_16MA,
> +       GPIO_DRV_STRENGTH_INVALID,
> +};
> +
> +struct bcm_cygnus_gpio {
> +       struct device *dev;
> +       void __iomem *base;
> +       void __iomem *io_ctrl;
> +       spinlock_t lock;
> +       struct gpio_chip gc;
> +       unsigned num_banks;
> +       int irq;
> +       struct irq_domain *irq_domain;
> +};
> +
> +static unsigned int gpio_base_index;

Nope. What happens if there are other GPIO controllers with
conflicting base GPIOs? I guess this adds more weight to that
"linux,gpio-base" property I mentioned in
http://www.spinics.net/lists/arm-kernel/msg384847.html .

The best solution would be for users of the GPIOs provided by this
driver to not rely on GPIO numbers at all, and exclusively use the
gpiod interface. Is that an option for you?

> +
> +static struct bcm_cygnus_gpio *to_bcm_cygnus_gpio(struct gpio_chip *gc)
> +{
> +       return container_of(gc, struct bcm_cygnus_gpio, gc);
> +}
> +
> +static int bcm_cygnus_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
> +{
> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
> +
> +       return irq_find_mapping(cygnus_gpio->irq_domain, offset);
> +}
> +
> +static unsigned int __gpio_reg_offset(struct bcm_cygnus_gpio *cygnus_gpio,
> +               unsigned gpio)
> +{
> +       return GPIO_BANK(gpio) * GPIO_BANK_SIZE;
> +}

The cygnus_gpio argument in this function is unused. The compiler is
supposed to signal such issues. Have you looked at your compiler
output?

> +
> +static unsigned int __gpio_bitpos(struct bcm_cygnus_gpio *cygnus_gpio,
> +               unsigned gpio)
> +{
> +       return GPIO_BIT(gpio);
> +}

Same here. Also they are so simple that macros would be more adequate
here I believe:

#define CYGNUS_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + reg)
#define CYGNUS_GPIO_SHIFT(pin) (pin % NGPIOS_PER_BANK) /* and remove
the GPIO_BIT macro */

> +
> +static void bcm_cygnus_gpio_irq_handler(unsigned int irq,
> +               struct irq_desc *desc)
> +{
> +       struct bcm_cygnus_gpio *cygnus_gpio;
> +       struct irq_chip *chip = irq_desc_get_chip(desc);
> +       int i, bit;
> +
> +       chained_irq_enter(chip, desc);
> +
> +       cygnus_gpio = irq_get_handler_data(irq);
> +
> +       /* go through the entire GPIO banks and handle all interrupts */
> +       for (i = 0; i < cygnus_gpio->num_banks; i++) {
> +               unsigned long val = readl(cygnus_gpio->base +
> +                               (i * GPIO_BANK_SIZE) +
> +                               CYGNUS_GPIO_INT_MSTAT_OFFSET);

Can you add cygnus_readl() and cygnus_writel() functions to avoid
explicitly doing this operation on cygnus_gpio->base every time? It
would be clearer and less error-prone.

> +
> +               for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
> +                       unsigned pin = NGPIOS_PER_BANK * i + bit;
> +                       int child_irq =
> +                               bcm_cygnus_gpio_to_irq(&cygnus_gpio->gc, pin);
> +
> +                       /*
> +                        * Clear the interrupt before invoking the
> +                        * handler, so we do not leave any window
> +                        */
> +                       writel(1 << bit,
> +                               cygnus_gpio->base + (i * GPIO_BANK_SIZE) +
> +                               CYGNUS_GPIO_INT_CLR_OFFSET);
> +
> +                       generic_handle_irq(child_irq);
> +               }
> +       }
> +
> +       chained_irq_exit(chip, desc);
> +}
> +
> +static void bcm_cygnus_gpio_irq_ack(struct irq_data *d)
> +{
> +       struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
> +       unsigned gpio = d->hwirq;
> +       unsigned int offset, shift;
> +       u32 val;
> +
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_INT_CLR_OFFSET;
> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
> +
> +       val = 1 << shift;

val = BIT(shift);

> +       writel(val, cygnus_gpio->base + offset);
> +
> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
> +                       offset, shift);
> +}
> +
> +static void bcm_cygnus_gpio_irq_mask(struct irq_data *d)
> +{
> +       struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
> +       unsigned gpio = d->hwirq;
> +       unsigned int offset, shift;
> +       u32 val;
> +       unsigned long flags;
> +
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_INT_MSK_OFFSET;
> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
> +
> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
> +
> +       val = readl(cygnus_gpio->base + offset);
> +       val &= ~(1 << shift);

val &= ~BIT(shift);

> +       writel(val, cygnus_gpio->base + offset);
> +
> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
> +
> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
> +                       offset, shift);
> +}
> +
> +static void bcm_cygnus_gpio_irq_unmask(struct irq_data *d)
> +{
> +       struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
> +       unsigned gpio = d->hwirq;
> +       unsigned int offset, shift;
> +       u32 val;
> +       unsigned long flags;
> +
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_INT_MSK_OFFSET;
> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
> +
> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
> +
> +       val = readl(cygnus_gpio->base + offset);
> +       val |= 1 << shift;

val |= BIT(shift);

Same remark everywhere it applies in this file.

> +       writel(val, cygnus_gpio->base + offset);
> +
> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
> +
> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
> +                       offset, shift);
> +}

It seems like you can factorize bcm_cygnus_gpio_irq_mask() and
bcm_cygnus_gpio_irq_unmask() into one function which prototype would
be, say:

static void bcm_cygnus_gpio_irq_set_mask(struct irq_data *d, int mask);

which would set of clear the bit according to the value of mask. Then
your two mask/unmask functions would just need to call this one,
reducing the amount of redundant code.

Also I noticed that this driver has lots of readl()/twiddle
bit/writel() sequences. Maybe it would make sense to have a
cygnus_set_bit(chip, reg, gpio, set) function to factorize this:

void cygnus_set_bit(chip, reg, gpio, set)
{
    unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
    unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
    u32 val;

    val = cygnus_readl(chip, offset);
    if (set)
        val |= BIT(shift);
    else
        val &= ~BIT(shift);
    cygnus_writel(chip, offset, val);
}

> +
> +static int bcm_cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
> +{
> +       struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
> +       unsigned gpio = d->hwirq;
> +       unsigned int int_type, dual_edge, edge_lvl;
> +       unsigned int offset, shift;
> +       u32 val;
> +       unsigned long flags;
> +
> +       switch (type & IRQ_TYPE_SENSE_MASK) {
> +       case IRQ_TYPE_EDGE_RISING:
> +               int_type = 0;
> +               dual_edge = 0;
> +               edge_lvl = 1;
> +               break;
> +
> +       case IRQ_TYPE_EDGE_FALLING:
> +               int_type = 0;
> +               dual_edge = 0;
> +               edge_lvl = 0;
> +               break;
> +
> +       case IRQ_TYPE_EDGE_BOTH:
> +               int_type = 0;
> +               dual_edge = 1;
> +               edge_lvl = 0;
> +               break;
> +
> +       case IRQ_TYPE_LEVEL_HIGH:
> +               int_type = 1;
> +               dual_edge = 0;
> +               edge_lvl = 1;
> +               break;
> +
> +       case IRQ_TYPE_LEVEL_LOW:
> +               int_type = 1;
> +               dual_edge = 0;
> +               edge_lvl = 0;
> +               break;
> +
> +       default:
> +               dev_err(cygnus_gpio->dev, "invalid GPIO irq type 0x%x\n", type);
> +               return -EINVAL;
> +       }
> +
> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
> +
> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_IN_TYPE_OFFSET;
> +       val = readl(cygnus_gpio->base + offset);
> +       val &= ~(1 << shift);
> +       val |= int_type << shift;
> +       writel(val, cygnus_gpio->base + offset);
> +
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_INT_DE_OFFSET;
> +       val = readl(cygnus_gpio->base + offset);
> +       val &= ~(1 << shift);
> +       val |= dual_edge << shift;
> +       writel(val, cygnus_gpio->base + offset);
> +
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_INT_EDGE_OFFSET;
> +       val = readl(cygnus_gpio->base + offset);
> +       val &= ~(1 << shift);
> +       val |= edge_lvl << shift;
> +       writel(val, cygnus_gpio->base + offset);

With the functions/macros suggested above I think you could change the
3 blocks above into something like:

cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_IN_TYPE_OFFSET, gpio, int_type);
cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_INT_DE_OFFSET, gpio, dual_edge);
cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_INT_EDGE_OFFSET, gpio, edge_lvl);

> +
> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
> +
> +       return 0;
> +}
> +
> +static struct irq_chip bcm_cygnus_gpio_irq_chip = {
> +       .name = "bcm-cygnus-gpio",
> +       .irq_ack = bcm_cygnus_gpio_irq_ack,
> +       .irq_mask = bcm_cygnus_gpio_irq_mask,
> +       .irq_unmask = bcm_cygnus_gpio_irq_unmask,
> +       .irq_set_type = bcm_cygnus_gpio_irq_set_type,
> +};
> +
> +static int bcm_cygnus_gpio_direction_input(struct gpio_chip *gc,
> +               unsigned gpio)
> +{
> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
> +       unsigned int offset, shift;
> +       u32 val;
> +       unsigned long flags;
> +
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_OUT_EN_OFFSET;
> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
> +
> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
> +
> +       val = readl(cygnus_gpio->base + offset);
> +       val &= ~(1 << shift);
> +       writel(val, cygnus_gpio->base + offset);
> +
> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
> +
> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
> +                       offset, shift);
> +
> +       return 0;
> +}
> +
> +static int bcm_cygnus_gpio_direction_output(struct gpio_chip *gc,
> +               unsigned gpio, int value)
> +{
> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
> +       unsigned int offset, shift;
> +       u32 val;
> +       unsigned long flags;
> +
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_OUT_EN_OFFSET;
> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
> +
> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
> +
> +       val = readl(cygnus_gpio->base + offset);
> +       val |= 1 << shift;
> +       writel(val, cygnus_gpio->base + offset);
> +
> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
> +                       offset, shift);
> +
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_DATA_OUT_OFFSET;
> +
> +       val = readl(cygnus_gpio->base + offset);
> +       if (value)
> +               val |= 1 << shift;
> +       else
> +               val &= ~(1 << shift);
> +       writel(val, cygnus_gpio->base + offset);

And here you would have:

cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 1);
cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);

Many other sites in this file could be simplified this way.

> +
> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
> +
> +       dev_dbg(cygnus_gpio->dev,
> +               "gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
> +               gpio, offset, shift, val);
> +
> +       return 0;
> +}
> +
> +static void bcm_cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio,
> +               int value)
> +{
> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
> +       unsigned int offset, shift;
> +       u32 val;
> +       unsigned long flags;
> +
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_DATA_OUT_OFFSET;
> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
> +
> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
> +
> +       val = readl(cygnus_gpio->base + offset);
> +       if (value)
> +               val |= 1 << shift;
> +       else
> +               val &= ~(1 << shift);
> +       writel(val, cygnus_gpio->base + offset);
> +
> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
> +
> +       dev_dbg(cygnus_gpio->dev,
> +               "gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
> +               gpio, offset, shift, val);
> +}
> +
> +static int bcm_cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
> +{
> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
> +       unsigned int offset, shift;
> +       u32 val;
> +
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_DATA_IN_OFFSET;
> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
> +
> +       val = readl(cygnus_gpio->base + offset);
> +       val = (val >> shift) & 1;
> +
> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u val:%u\n",
> +                       gpio, offset, shift, val);
> +
> +       return val;
> +}
> +
> +static struct lock_class_key gpio_lock_class;
> +
> +static int bcm_cygnus_gpio_irq_map(struct irq_domain *d, unsigned int irq,
> +                                irq_hw_number_t hwirq)
> +{
> +       int ret;
> +
> +       ret = irq_set_chip_data(irq, d->host_data);
> +       if (ret < 0)
> +               return ret;
> +       irq_set_lockdep_class(irq, &gpio_lock_class);
> +       irq_set_chip_and_handler(irq, &bcm_cygnus_gpio_irq_chip,
> +                       handle_simple_irq);
> +       set_irq_flags(irq, IRQF_VALID);
> +
> +       return 0;
> +}
> +
> +static void bcm_cygnus_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
> +{
> +       irq_set_chip_and_handler(irq, NULL, NULL);
> +       irq_set_chip_data(irq, NULL);
> +}
> +
> +static struct irq_domain_ops bcm_cygnus_irq_ops = {
> +       .map = bcm_cygnus_gpio_irq_map,
> +       .unmap = bcm_cygnus_gpio_irq_unmap,
> +       .xlate = irq_domain_xlate_twocell,
> +};
> +
> +#ifdef CONFIG_OF_GPIO
> +static void bcm_cygnus_gpio_set_pull(struct bcm_cygnus_gpio *cygnus_gpio,
> +               unsigned gpio, enum gpio_pull pull)
> +{
> +       unsigned int offset, shift;
> +       u32 val, pullup;
> +       unsigned long flags;
> +
> +       switch (pull) {
> +       case GPIO_PULL_UP:
> +               pullup = 1;
> +               break;
> +       case GPIO_PULL_DOWN:
> +               pullup = 0;
> +               break;
> +       case GPIO_PULL_NONE:
> +       case GPIO_PULL_INVALID:
> +       default:
> +               return;
> +       }
> +
> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
> +
> +       /* set pull up/down */
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_PAD_RES_OFFSET;
> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
> +
> +       val = readl(cygnus_gpio->base + offset);
> +       val &= ~(1 << shift);
> +       if (pullup)
> +               val |= 1 << shift;
> +       writel(val, cygnus_gpio->base + offset);
> +
> +       /* enable pad */
> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +               CYGNUS_GPIO_RES_EN_OFFSET;
> +       val = readl(cygnus_gpio->base + offset);
> +       val |= 1 << shift;
> +       writel(val, cygnus_gpio->base + offset);
> +
> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
> +}
> +
> +static void bcm_cygnus_gpio_set_strength(struct bcm_cygnus_gpio *cygnus_gpio,
> +               unsigned gpio, enum gpio_drv_strength strength)
> +{
> +       struct device *dev = cygnus_gpio->dev;
> +       void __iomem *base;
> +       unsigned int i, offset, shift;
> +       u32 val;
> +       unsigned long flags;
> +
> +       /* some GPIO controllers do not support drive strength configuration */
> +       if (of_find_property(dev->of_node, "no-drv-strength", NULL))
> +               return;
> +
> +       if (cygnus_gpio->io_ctrl) {
> +               base = cygnus_gpio->io_ctrl;
> +               offset = CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET;
> +       } else {
> +               base = cygnus_gpio->base;
> +               offset = __gpio_reg_offset(cygnus_gpio, gpio) +
> +                       CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET;
> +       }
> +
> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
> +
> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
> +
> +       for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
> +               val = readl(base + offset);
> +               val &= ~(1 << shift);
> +               val |= ((strength >> i) & 0x1) << shift;
> +               writel(val, base + offset);
> +               offset += 4;
> +       }
> +
> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
> +}
> +
> +static int bcm_cygnus_gpio_of_xlate(struct gpio_chip *gc,
> +               const struct of_phandle_args *gpiospec, u32 *flags)
> +{
> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
> +       enum gpio_pull pull;
> +       enum gpio_drv_strength strength;
> +
> +       if (gc->of_gpio_n_cells < 2)
> +               return -EINVAL;
> +
> +       if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
> +               return -EINVAL;
> +
> +       if (gpiospec->args[0] >= gc->ngpio)
> +               return -EINVAL;
> +
> +       pull = (gpiospec->args[1] >> GPIO_PULL_BIT_SHIFT) & GPIO_PULL_BIT_MASK;
> +       if (WARN_ON(pull >= GPIO_PULL_INVALID))
> +               return -EINVAL;
> +
> +       strength = (gpiospec->args[1] >> GPIO_DRV_STRENGTH_BIT_SHIFT) &
> +               GPIO_DRV_STRENGTH_BIT_MASK;
> +
> +       if (flags)
> +               *flags = gpiospec->args[1] & GPIO_FLAG_BIT_MASK;
> +
> +       bcm_cygnus_gpio_set_pull(cygnus_gpio, gpiospec->args[0], pull);
> +       bcm_cygnus_gpio_set_strength(cygnus_gpio, gpiospec->args[0], strength);
> +
> +       return gpiospec->args[0];
> +}
> +#endif
> +
> +static const struct of_device_id bcm_cygnus_gpio_of_match[] = {
> +       { .compatible = "brcm,cygnus-gpio" },
> +       { }
> +};
> +MODULE_DEVICE_TABLE(of, bcm_cygnus_gpio_of_match);
> +
> +static int bcm_cygnus_gpio_probe(struct platform_device *pdev)
> +{
> +       struct device *dev = &pdev->dev;
> +       const struct of_device_id *match;
> +       struct resource *res;
> +       struct bcm_cygnus_gpio *cygnus_gpio;
> +       struct gpio_chip *gc;
> +       u32 i, ngpios;
> +       int ret;
> +
> +       match = of_match_device(bcm_cygnus_gpio_of_match, dev);
> +       if (!match) {
> +               dev_err(&pdev->dev, "failed to find GPIO controller\n");
> +               return -ENODEV;
> +       }

Do you still need that block of code? match is never used in this function.

... well, I think you get the drill. Let's first start by factorizing
as much code as can be to make this driver easier to read (I have a
few leads, but I am sure there are other similar factorizations that
can be made). Let's also get rid of this static gpio_base_index
variable that effectively prevents any other GPIO driver from being
used alongside with this one. If you really need to use global GPIO
numbers, let's see if Linus agrees for that "linux,gpio-base" DT
property that would certainly make many people happy.

Re: [PATCH 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Arnd Bergmann]

On Tuesday 09 December 2014 16:04:29 Ray Jui wrote:
> Add initial version of the Broadcom iProc PCIe driver. This driver
> has been tested on NSP and Cygnus and is expected to work on all iProc
> family of SoCs that deploys the same PCIe host controller
> 
> The driver also supports MSI
> 
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>

The driver looks suspiciously like the one that Hauke already submitted a
while ago for bcm53xx. Please come up with a merged driver that works for
both.

Are you sure that iProc isn't based on the BCMA bus infrastructure after
all? Even the physical address of your PCI host falls into the address
range that is used for the internal BCMA bus on the other chips!

	Arnd

[PATCH 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Arnd Bergmann]

On Tuesday 09 December 2014 16:04:29 Ray Jui wrote:
> Add initial version of the Broadcom iProc PCIe driver. This driver
> has been tested on NSP and Cygnus and is expected to work on all iProc
> family of SoCs that deploys the same PCIe host controller
> 
> The driver also supports MSI
> 
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>

The driver looks suspiciously like the one that Hauke already submitted a
while ago for bcm53xx. Please come up with a merged driver that works for
both.

Are you sure that iProc isn't based on the BCMA bus infrastructure after
all? Even the physical address of your PCI host falls into the address
range that is used for the internal BCMA bus on the other chips!

	Arnd

Re: [PATCH 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Scott Branden]

On 14-12-10 03:31 AM, Arnd Bergmann wrote:
> On Tuesday 09 December 2014 16:04:29 Ray Jui wrote:
>> Add initial version of the Broadcom iProc PCIe driver. This driver
>> has been tested on NSP and Cygnus and is expected to work on all iProc
>> family of SoCs that deploys the same PCIe host controller
>>
>> The driver also supports MSI
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>
> The driver looks suspiciously like the one that Hauke already submitted a
> while ago for bcm53xx. Please come up with a merged driver that works for
> both.
Could you please be a little more specific.  What driver did "Hauke 
already submitted"?  I do not see any driver in the kernel you are 
talking about.
>
> Are you sure that iProc isn't based on the BCMA bus infrastructure after
> all? Even the physical address of your PCI host falls into the address
> range that is used for the internal BCMA bus on the other chips!
BCMA seems to be for MIPS architectures.  It seems to be quite specific 
to those architectures using BCMA.  I see no use of it in bcm53xx code?
>
> 	Arnd
>

Re: [PATCH 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Scott Branden]

On 14-12-10 03:31 AM, Arnd Bergmann wrote:
> On Tuesday 09 December 2014 16:04:29 Ray Jui wrote:
>> Add initial version of the Broadcom iProc PCIe driver. This driver
>> has been tested on NSP and Cygnus and is expected to work on all iProc
>> family of SoCs that deploys the same PCIe host controller
>>
>> The driver also supports MSI
>>
>> Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>> Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>
> The driver looks suspiciously like the one that Hauke already submitted a
> while ago for bcm53xx. Please come up with a merged driver that works for
> both.
Could you please be a little more specific.  What driver did "Hauke 
already submitted"?  I do not see any driver in the kernel you are 
talking about.
>
> Are you sure that iProc isn't based on the BCMA bus infrastructure after
> all? Even the physical address of your PCI host falls into the address
> range that is used for the internal BCMA bus on the other chips!
BCMA seems to be for MIPS architectures.  It seems to be quite specific 
to those architectures using BCMA.  I see no use of it in bcm53xx code?
>
> 	Arnd
>

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[PATCH 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Scott Branden]

On 14-12-10 03:31 AM, Arnd Bergmann wrote:
> On Tuesday 09 December 2014 16:04:29 Ray Jui wrote:
>> Add initial version of the Broadcom iProc PCIe driver. This driver
>> has been tested on NSP and Cygnus and is expected to work on all iProc
>> family of SoCs that deploys the same PCIe host controller
>>
>> The driver also supports MSI
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>
> The driver looks suspiciously like the one that Hauke already submitted a
> while ago for bcm53xx. Please come up with a merged driver that works for
> both.
Could you please be a little more specific.  What driver did "Hauke 
already submitted"?  I do not see any driver in the kernel you are 
talking about.
>
> Are you sure that iProc isn't based on the BCMA bus infrastructure after
> all? Even the physical address of your PCI host falls into the address
> range that is used for the internal BCMA bus on the other chips!
BCMA seems to be for MIPS architectures.  It seems to be quite specific 
to those architectures using BCMA.  I see no use of it in bcm53xx code?
>
> 	Arnd
>

Re: [PATCH 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Florian Fainelli]

2014-12-10 8:46 GMT-08:00 Scott Branden <sbranden@broadcom.com>:
> On 14-12-10 03:31 AM, Arnd Bergmann wrote:
>>
>> On Tuesday 09 December 2014 16:04:29 Ray Jui wrote:
>>>
>>> Add initial version of the Broadcom iProc PCIe driver. This driver
>>> has been tested on NSP and Cygnus and is expected to work on all iProc
>>> family of SoCs that deploys the same PCIe host controller
>>>
>>> The driver also supports MSI
>>>
>>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>>
>>
>> The driver looks suspiciously like the one that Hauke already submitted a
>> while ago for bcm53xx. Please come up with a merged driver that works for
>> both.
>
> Could you please be a little more specific.  What driver did "Hauke already
> submitted"?  I do not see any driver in the kernel you are talking about.

https://www.marc.info/?l=linux-pci&m=141547043110684&w=2

>>
>>
>> Are you sure that iProc isn't based on the BCMA bus infrastructure after
>> all? Even the physical address of your PCI host falls into the address
>> range that is used for the internal BCMA bus on the other chips!
>
> BCMA seems to be for MIPS architectures.  It seems to be quite specific to
> those architectures using BCMA.  I see no use of it in bcm53xx code?

BCMA lives in its own directory in drivers/bcma/ and is not specific
to MIPS actually. Older BCM47xx/BCM53xx MIPS-based SoCs traditionally
started with a discoverable Silicon Sonics Backplane (drivers/ssb) and
progressively migrated to BCMA (drivers/bcma), both subsystems offer a
very similar bus/device/driver abstraction and discovery mechanism.
-- 
Florian

Re: [PATCH 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Florian Fainelli]

2014-12-10 8:46 GMT-08:00 Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>:
> On 14-12-10 03:31 AM, Arnd Bergmann wrote:
>>
>> On Tuesday 09 December 2014 16:04:29 Ray Jui wrote:
>>>
>>> Add initial version of the Broadcom iProc PCIe driver. This driver
>>> has been tested on NSP and Cygnus and is expected to work on all iProc
>>> family of SoCs that deploys the same PCIe host controller
>>>
>>> The driver also supports MSI
>>>
>>> Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>>> Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>>
>>
>> The driver looks suspiciously like the one that Hauke already submitted a
>> while ago for bcm53xx. Please come up with a merged driver that works for
>> both.
>
> Could you please be a little more specific.  What driver did "Hauke already
> submitted"?  I do not see any driver in the kernel you are talking about.

https://www.marc.info/?l=linux-pci&m=141547043110684&w=2

>>
>>
>> Are you sure that iProc isn't based on the BCMA bus infrastructure after
>> all? Even the physical address of your PCI host falls into the address
>> range that is used for the internal BCMA bus on the other chips!
>
> BCMA seems to be for MIPS architectures.  It seems to be quite specific to
> those architectures using BCMA.  I see no use of it in bcm53xx code?

BCMA lives in its own directory in drivers/bcma/ and is not specific
to MIPS actually. Older BCM47xx/BCM53xx MIPS-based SoCs traditionally
started with a discoverable Silicon Sonics Backplane (drivers/ssb) and
progressively migrated to BCMA (drivers/bcma), both subsystems offer a
very similar bus/device/driver abstraction and discovery mechanism.
-- 
Florian
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Re: [PATCH 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Florian Fainelli]

2014-12-10 8:46 GMT-08:00 Scott Branden <sbranden@broadcom.com>:
> On 14-12-10 03:31 AM, Arnd Bergmann wrote:
>>
>> On Tuesday 09 December 2014 16:04:29 Ray Jui wrote:
>>>
>>> Add initial version of the Broadcom iProc PCIe driver. This driver
>>> has been tested on NSP and Cygnus and is expected to work on all iProc
>>> family of SoCs that deploys the same PCIe host controller
>>>
>>> The driver also supports MSI
>>>
>>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>>
>>
>> The driver looks suspiciously like the one that Hauke already submitted a
>> while ago for bcm53xx. Please come up with a merged driver that works for
>> both.
>
> Could you please be a little more specific.  What driver did "Hauke already
> submitted"?  I do not see any driver in the kernel you are talking about.

https://www.marc.info/?l=linux-pci&m=141547043110684&w=2

>>
>>
>> Are you sure that iProc isn't based on the BCMA bus infrastructure after
>> all? Even the physical address of your PCI host falls into the address
>> range that is used for the internal BCMA bus on the other chips!
>
> BCMA seems to be for MIPS architectures.  It seems to be quite specific to
> those architectures using BCMA.  I see no use of it in bcm53xx code?

BCMA lives in its own directory in drivers/bcma/ and is not specific
to MIPS actually. Older BCM47xx/BCM53xx MIPS-based SoCs traditionally
started with a discoverable Silicon Sonics Backplane (drivers/ssb) and
progressively migrated to BCMA (drivers/bcma), both subsystems offer a
very similar bus/device/driver abstraction and discovery mechanism.
-- 
Florian

[PATCH 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Florian Fainelli]

2014-12-10 8:46 GMT-08:00 Scott Branden <sbranden@broadcom.com>:
> On 14-12-10 03:31 AM, Arnd Bergmann wrote:
>>
>> On Tuesday 09 December 2014 16:04:29 Ray Jui wrote:
>>>
>>> Add initial version of the Broadcom iProc PCIe driver. This driver
>>> has been tested on NSP and Cygnus and is expected to work on all iProc
>>> family of SoCs that deploys the same PCIe host controller
>>>
>>> The driver also supports MSI
>>>
>>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>>
>>
>> The driver looks suspiciously like the one that Hauke already submitted a
>> while ago for bcm53xx. Please come up with a merged driver that works for
>> both.
>
> Could you please be a little more specific.  What driver did "Hauke already
> submitted"?  I do not see any driver in the kernel you are talking about.

https://www.marc.info/?l=linux-pci&m=141547043110684&w=2

>>
>>
>> Are you sure that iProc isn't based on the BCMA bus infrastructure after
>> all? Even the physical address of your PCI host falls into the address
>> range that is used for the internal BCMA bus on the other chips!
>
> BCMA seems to be for MIPS architectures.  It seems to be quite specific to
> those architectures using BCMA.  I see no use of it in bcm53xx code?

BCMA lives in its own directory in drivers/bcma/ and is not specific
to MIPS actually. Older BCM47xx/BCM53xx MIPS-based SoCs traditionally
started with a discoverable Silicon Sonics Backplane (drivers/ssb) and
progressively migrated to BCMA (drivers/bcma), both subsystems offer a
very similar bus/device/driver abstraction and discovery mechanism.
-- 
Florian

Re: [PATCH 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Hauke Mehrtens]

On 12/10/2014 07:46 PM, Florian Fainelli wrote:
> 2014-12-10 8:46 GMT-08:00 Scott Branden <sbranden@broadcom.com>:
>> On 14-12-10 03:31 AM, Arnd Bergmann wrote:
>>>
>>> On Tuesday 09 December 2014 16:04:29 Ray Jui wrote:
>>>>
>>>> Add initial version of the Broadcom iProc PCIe driver. This driver
>>>> has been tested on NSP and Cygnus and is expected to work on all iProc
>>>> family of SoCs that deploys the same PCIe host controller
>>>>
>>>> The driver also supports MSI
>>>>
>>>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>>>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>>>
>>>
>>> The driver looks suspiciously like the one that Hauke already submitted a
>>> while ago for bcm53xx. Please come up with a merged driver that works for
>>> both.
>>
>> Could you please be a little more specific.  What driver did "Hauke already
>> submitted"?  I do not see any driver in the kernel you are talking about.
> 
> https://www.marc.info/?l=linux-pci&m=141547043110684&w=2

Yes it also looks similar to me. Your code also contains the same
comments as the driver used on Northstar (BCM5301X). Your driver has
some more features, but I just have access to the consumer SoC Northstar
where the PCIe controller is only used to connect some Broadcom Wifi
chips to the SoC. I do not know If this controller does not have these
features or the driver I used as a reference does not implement them.

When I find some time I will try this driver on a Northstar device. I
think your driver is more advanced then the one I send to the mailing list.

When you want to stay with pure device tree I will send a patch adding
additional support for registering to bcma.

Does your SoC also have a third PCIe controller which shares the PHY
with the USB 3 controller?

Why is this stuff in the iproc_pcie_check_link() function needed? I
think it is strange that the controller driver has to check if the
device is there and set the correct speed. When we do not check if the
card is there on BCM5301X the device stops working.

>>> Are you sure that iProc isn't based on the BCMA bus infrastructure after
>>> all? Even the physical address of your PCI host falls into the address
>>> range that is used for the internal BCMA bus on the other chips!
>>
>> BCMA seems to be for MIPS architectures.  It seems to be quite specific to
>> those architectures using BCMA.  I see no use of it in bcm53xx code?
> 
> BCMA lives in its own directory in drivers/bcma/ and is not specific
> to MIPS actually. Older BCM47xx/BCM53xx MIPS-based SoCs traditionally
> started with a discoverable Silicon Sonics Backplane (drivers/ssb) and
> progressively migrated to BCMA (drivers/bcma), both subsystems offer a
> very similar bus/device/driver abstraction and discovery mechanism.

With mainline kernel 3.18 you can boot Linux on a BCM5301X SoC and bcma
will find all the cores.

Hauke

Re: [PATCH 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Hauke Mehrtens]

On 12/10/2014 07:46 PM, Florian Fainelli wrote:
> 2014-12-10 8:46 GMT-08:00 Scott Branden <sbranden@broadcom.com>:
>> On 14-12-10 03:31 AM, Arnd Bergmann wrote:
>>>
>>> On Tuesday 09 December 2014 16:04:29 Ray Jui wrote:
>>>>
>>>> Add initial version of the Broadcom iProc PCIe driver. This driver
>>>> has been tested on NSP and Cygnus and is expected to work on all iProc
>>>> family of SoCs that deploys the same PCIe host controller
>>>>
>>>> The driver also supports MSI
>>>>
>>>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>>>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>>>
>>>
>>> The driver looks suspiciously like the one that Hauke already submitted a
>>> while ago for bcm53xx. Please come up with a merged driver that works for
>>> both.
>>
>> Could you please be a little more specific.  What driver did "Hauke already
>> submitted"?  I do not see any driver in the kernel you are talking about.
> 
> https://www.marc.info/?l=linux-pci&m=141547043110684&w=2

Yes it also looks similar to me. Your code also contains the same
comments as the driver used on Northstar (BCM5301X). Your driver has
some more features, but I just have access to the consumer SoC Northstar
where the PCIe controller is only used to connect some Broadcom Wifi
chips to the SoC. I do not know If this controller does not have these
features or the driver I used as a reference does not implement them.

When I find some time I will try this driver on a Northstar device. I
think your driver is more advanced then the one I send to the mailing list.

When you want to stay with pure device tree I will send a patch adding
additional support for registering to bcma.

Does your SoC also have a third PCIe controller which shares the PHY
with the USB 3 controller?

Why is this stuff in the iproc_pcie_check_link() function needed? I
think it is strange that the controller driver has to check if the
device is there and set the correct speed. When we do not check if the
card is there on BCM5301X the device stops working.

>>> Are you sure that iProc isn't based on the BCMA bus infrastructure after
>>> all? Even the physical address of your PCI host falls into the address
>>> range that is used for the internal BCMA bus on the other chips!
>>
>> BCMA seems to be for MIPS architectures.  It seems to be quite specific to
>> those architectures using BCMA.  I see no use of it in bcm53xx code?
> 
> BCMA lives in its own directory in drivers/bcma/ and is not specific
> to MIPS actually. Older BCM47xx/BCM53xx MIPS-based SoCs traditionally
> started with a discoverable Silicon Sonics Backplane (drivers/ssb) and
> progressively migrated to BCMA (drivers/bcma), both subsystems offer a
> very similar bus/device/driver abstraction and discovery mechanism.

With mainline kernel 3.18 you can boot Linux on a BCM5301X SoC and bcma
will find all the cores.

Hauke

[PATCH 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Hauke Mehrtens]

On 12/10/2014 07:46 PM, Florian Fainelli wrote:
> 2014-12-10 8:46 GMT-08:00 Scott Branden <sbranden@broadcom.com>:
>> On 14-12-10 03:31 AM, Arnd Bergmann wrote:
>>>
>>> On Tuesday 09 December 2014 16:04:29 Ray Jui wrote:
>>>>
>>>> Add initial version of the Broadcom iProc PCIe driver. This driver
>>>> has been tested on NSP and Cygnus and is expected to work on all iProc
>>>> family of SoCs that deploys the same PCIe host controller
>>>>
>>>> The driver also supports MSI
>>>>
>>>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>>>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>>>
>>>
>>> The driver looks suspiciously like the one that Hauke already submitted a
>>> while ago for bcm53xx. Please come up with a merged driver that works for
>>> both.
>>
>> Could you please be a little more specific.  What driver did "Hauke already
>> submitted"?  I do not see any driver in the kernel you are talking about.
> 
> https://www.marc.info/?l=linux-pci&m=141547043110684&w=2

Yes it also looks similar to me. Your code also contains the same
comments as the driver used on Northstar (BCM5301X). Your driver has
some more features, but I just have access to the consumer SoC Northstar
where the PCIe controller is only used to connect some Broadcom Wifi
chips to the SoC. I do not know If this controller does not have these
features or the driver I used as a reference does not implement them.

When I find some time I will try this driver on a Northstar device. I
think your driver is more advanced then the one I send to the mailing list.

When you want to stay with pure device tree I will send a patch adding
additional support for registering to bcma.

Does your SoC also have a third PCIe controller which shares the PHY
with the USB 3 controller?

Why is this stuff in the iproc_pcie_check_link() function needed? I
think it is strange that the controller driver has to check if the
device is there and set the correct speed. When we do not check if the
card is there on BCM5301X the device stops working.

>>> Are you sure that iProc isn't based on the BCMA bus infrastructure after
>>> all? Even the physical address of your PCI host falls into the address
>>> range that is used for the internal BCMA bus on the other chips!
>>
>> BCMA seems to be for MIPS architectures.  It seems to be quite specific to
>> those architectures using BCMA.  I see no use of it in bcm53xx code?
> 
> BCMA lives in its own directory in drivers/bcma/ and is not specific
> to MIPS actually. Older BCM47xx/BCM53xx MIPS-based SoCs traditionally
> started with a discoverable Silicon Sonics Backplane (drivers/ssb) and
> progressively migrated to BCMA (drivers/bcma), both subsystems offer a
> very similar bus/device/driver abstraction and discovery mechanism.

With mainline kernel 3.18 you can boot Linux on a BCM5301X SoC and bcma
will find all the cores.

Hauke

Re: [PATCH 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Ray Jui]

On 12/10/2014 12:26 PM, Hauke Mehrtens wrote:
> On 12/10/2014 07:46 PM, Florian Fainelli wrote:
>> 2014-12-10 8:46 GMT-08:00 Scott Branden <sbranden@broadcom.com>:
>>> On 14-12-10 03:31 AM, Arnd Bergmann wrote:
>>>>
>>>> On Tuesday 09 December 2014 16:04:29 Ray Jui wrote:
>>>>>
>>>>> Add initial version of the Broadcom iProc PCIe driver. This driver
>>>>> has been tested on NSP and Cygnus and is expected to work on all iProc
>>>>> family of SoCs that deploys the same PCIe host controller
>>>>>
>>>>> The driver also supports MSI
>>>>>
>>>>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>>>>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>>>>
>>>>
>>>> The driver looks suspiciously like the one that Hauke already submitted a
>>>> while ago for bcm53xx. Please come up with a merged driver that works for
>>>> both.
>>>
>>> Could you please be a little more specific.  What driver did "Hauke already
>>> submitted"?  I do not see any driver in the kernel you are talking about.
>>
>> https://www.marc.info/?l=linux-pci&m=141547043110684&w=2
>
> Yes it also looks similar to me. Your code also contains the same
> comments as the driver used on Northstar (BCM5301X).Your driver has
> some more features, but I just have access to the consumer SoC Northstar
> where the PCIe controller is only used to connect some Broadcom Wifi
> chips to the SoC. I do not know If this controller does not have these
> features or the driver I used as a reference does not implement them.
>
Right, I wrote this driver based on some old Broadcom internal PCIe 
driver from a 3.6 kernel and might have copied some of the comments 
(especially in the check link function). The 3.6 driver is probably what 
you received?

> When I find some time I will try this driver on a Northstar device. I
> think your driver is more advanced then the one I send to the mailing list.
>
Please do that. I tested this driver on Cygnus and one of my colleagues 
helped to test it on North Star Plus. We do expect the same driver to 
work on NorthStar as well.

> When you want to stay with pure device tree I will send a patch adding
> additional support for registering to bcma.
>
What exactly is bcma? I guess I'll need to look into it in more details 
myself.

> Does your SoC also have a third PCIe controller which shares the PHY
> with the USB 3 controller?
No. Cygnus has only two PCIe controllers, each has its own dedicated PHY.

>
> Why is this stuff in the iproc_pcie_check_link() function needed? I
> think it is strange that the controller driver has to check if the
> device is there and set the correct speed. When we do not check if the
> card is there on BCM5301X the device stops working.
>
I need to check with our ASIC engineer on this. In theory we should be 
able to support hot plug eventually, but maybe not in the initial 
version of this driver.

>>>> Are you sure that iProc isn't based on the BCMA bus infrastructure after
>>>> all? Even the physical address of your PCI host falls into the address
>>>> range that is used for the internal BCMA bus on the other chips!
>>>
>>> BCMA seems to be for MIPS architectures.  It seems to be quite specific to
>>> those architectures using BCMA.  I see no use of it in bcm53xx code?
>>
>> BCMA lives in its own directory in drivers/bcma/ and is not specific
>> to MIPS actually. Older BCM47xx/BCM53xx MIPS-based SoCs traditionally
>> started with a discoverable Silicon Sonics Backplane (drivers/ssb) and
>> progressively migrated to BCMA (drivers/bcma), both subsystems offer a
>> very similar bus/device/driver abstraction and discovery mechanism.
>
> With mainline kernel 3.18 you can boot Linux on a BCM5301X SoC and bcma
> will find all the cores.
>
> Hauke
>

Re: [PATCH 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Ray Jui]

On 12/10/2014 12:26 PM, Hauke Mehrtens wrote:
> On 12/10/2014 07:46 PM, Florian Fainelli wrote:
>> 2014-12-10 8:46 GMT-08:00 Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>:
>>> On 14-12-10 03:31 AM, Arnd Bergmann wrote:
>>>>
>>>> On Tuesday 09 December 2014 16:04:29 Ray Jui wrote:
>>>>>
>>>>> Add initial version of the Broadcom iProc PCIe driver. This driver
>>>>> has been tested on NSP and Cygnus and is expected to work on all iProc
>>>>> family of SoCs that deploys the same PCIe host controller
>>>>>
>>>>> The driver also supports MSI
>>>>>
>>>>> Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>>>>> Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>>>>
>>>>
>>>> The driver looks suspiciously like the one that Hauke already submitted a
>>>> while ago for bcm53xx. Please come up with a merged driver that works for
>>>> both.
>>>
>>> Could you please be a little more specific.  What driver did "Hauke already
>>> submitted"?  I do not see any driver in the kernel you are talking about.
>>
>> https://www.marc.info/?l=linux-pci&m=141547043110684&w=2
>
> Yes it also looks similar to me. Your code also contains the same
> comments as the driver used on Northstar (BCM5301X).Your driver has
> some more features, but I just have access to the consumer SoC Northstar
> where the PCIe controller is only used to connect some Broadcom Wifi
> chips to the SoC. I do not know If this controller does not have these
> features or the driver I used as a reference does not implement them.
>
Right, I wrote this driver based on some old Broadcom internal PCIe 
driver from a 3.6 kernel and might have copied some of the comments 
(especially in the check link function). The 3.6 driver is probably what 
you received?

> When I find some time I will try this driver on a Northstar device. I
> think your driver is more advanced then the one I send to the mailing list.
>
Please do that. I tested this driver on Cygnus and one of my colleagues 
helped to test it on North Star Plus. We do expect the same driver to 
work on NorthStar as well.

> When you want to stay with pure device tree I will send a patch adding
> additional support for registering to bcma.
>
What exactly is bcma? I guess I'll need to look into it in more details 
myself.

> Does your SoC also have a third PCIe controller which shares the PHY
> with the USB 3 controller?
No. Cygnus has only two PCIe controllers, each has its own dedicated PHY.

>
> Why is this stuff in the iproc_pcie_check_link() function needed? I
> think it is strange that the controller driver has to check if the
> device is there and set the correct speed. When we do not check if the
> card is there on BCM5301X the device stops working.
>
I need to check with our ASIC engineer on this. In theory we should be 
able to support hot plug eventually, but maybe not in the initial 
version of this driver.

>>>> Are you sure that iProc isn't based on the BCMA bus infrastructure after
>>>> all? Even the physical address of your PCI host falls into the address
>>>> range that is used for the internal BCMA bus on the other chips!
>>>
>>> BCMA seems to be for MIPS architectures.  It seems to be quite specific to
>>> those architectures using BCMA.  I see no use of it in bcm53xx code?
>>
>> BCMA lives in its own directory in drivers/bcma/ and is not specific
>> to MIPS actually. Older BCM47xx/BCM53xx MIPS-based SoCs traditionally
>> started with a discoverable Silicon Sonics Backplane (drivers/ssb) and
>> progressively migrated to BCMA (drivers/bcma), both subsystems offer a
>> very similar bus/device/driver abstraction and discovery mechanism.
>
> With mainline kernel 3.18 you can boot Linux on a BCM5301X SoC and bcma
> will find all the cores.
>
> Hauke
>
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Re: [PATCH 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Ray Jui]

On 12/10/2014 12:26 PM, Hauke Mehrtens wrote:
> On 12/10/2014 07:46 PM, Florian Fainelli wrote:
>> 2014-12-10 8:46 GMT-08:00 Scott Branden <sbranden@broadcom.com>:
>>> On 14-12-10 03:31 AM, Arnd Bergmann wrote:
>>>>
>>>> On Tuesday 09 December 2014 16:04:29 Ray Jui wrote:
>>>>>
>>>>> Add initial version of the Broadcom iProc PCIe driver. This driver
>>>>> has been tested on NSP and Cygnus and is expected to work on all iProc
>>>>> family of SoCs that deploys the same PCIe host controller
>>>>>
>>>>> The driver also supports MSI
>>>>>
>>>>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>>>>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>>>>
>>>>
>>>> The driver looks suspiciously like the one that Hauke already submitted a
>>>> while ago for bcm53xx. Please come up with a merged driver that works for
>>>> both.
>>>
>>> Could you please be a little more specific.  What driver did "Hauke already
>>> submitted"?  I do not see any driver in the kernel you are talking about.
>>
>> https://www.marc.info/?l=linux-pci&m=141547043110684&w=2
>
> Yes it also looks similar to me. Your code also contains the same
> comments as the driver used on Northstar (BCM5301X).Your driver has
> some more features, but I just have access to the consumer SoC Northstar
> where the PCIe controller is only used to connect some Broadcom Wifi
> chips to the SoC. I do not know If this controller does not have these
> features or the driver I used as a reference does not implement them.
>
Right, I wrote this driver based on some old Broadcom internal PCIe 
driver from a 3.6 kernel and might have copied some of the comments 
(especially in the check link function). The 3.6 driver is probably what 
you received?

> When I find some time I will try this driver on a Northstar device. I
> think your driver is more advanced then the one I send to the mailing list.
>
Please do that. I tested this driver on Cygnus and one of my colleagues 
helped to test it on North Star Plus. We do expect the same driver to 
work on NorthStar as well.

> When you want to stay with pure device tree I will send a patch adding
> additional support for registering to bcma.
>
What exactly is bcma? I guess I'll need to look into it in more details 
myself.

> Does your SoC also have a third PCIe controller which shares the PHY
> with the USB 3 controller?
No. Cygnus has only two PCIe controllers, each has its own dedicated PHY.

>
> Why is this stuff in the iproc_pcie_check_link() function needed? I
> think it is strange that the controller driver has to check if the
> device is there and set the correct speed. When we do not check if the
> card is there on BCM5301X the device stops working.
>
I need to check with our ASIC engineer on this. In theory we should be 
able to support hot plug eventually, but maybe not in the initial 
version of this driver.

>>>> Are you sure that iProc isn't based on the BCMA bus infrastructure after
>>>> all? Even the physical address of your PCI host falls into the address
>>>> range that is used for the internal BCMA bus on the other chips!
>>>
>>> BCMA seems to be for MIPS architectures.  It seems to be quite specific to
>>> those architectures using BCMA.  I see no use of it in bcm53xx code?
>>
>> BCMA lives in its own directory in drivers/bcma/ and is not specific
>> to MIPS actually. Older BCM47xx/BCM53xx MIPS-based SoCs traditionally
>> started with a discoverable Silicon Sonics Backplane (drivers/ssb) and
>> progressively migrated to BCMA (drivers/bcma), both subsystems offer a
>> very similar bus/device/driver abstraction and discovery mechanism.
>
> With mainline kernel 3.18 you can boot Linux on a BCM5301X SoC and bcma
> will find all the cores.
>
> Hauke
>

[PATCH 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Ray Jui]

On 12/10/2014 12:26 PM, Hauke Mehrtens wrote:
> On 12/10/2014 07:46 PM, Florian Fainelli wrote:
>> 2014-12-10 8:46 GMT-08:00 Scott Branden <sbranden@broadcom.com>:
>>> On 14-12-10 03:31 AM, Arnd Bergmann wrote:
>>>>
>>>> On Tuesday 09 December 2014 16:04:29 Ray Jui wrote:
>>>>>
>>>>> Add initial version of the Broadcom iProc PCIe driver. This driver
>>>>> has been tested on NSP and Cygnus and is expected to work on all iProc
>>>>> family of SoCs that deploys the same PCIe host controller
>>>>>
>>>>> The driver also supports MSI
>>>>>
>>>>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>>>>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>>>>
>>>>
>>>> The driver looks suspiciously like the one that Hauke already submitted a
>>>> while ago for bcm53xx. Please come up with a merged driver that works for
>>>> both.
>>>
>>> Could you please be a little more specific.  What driver did "Hauke already
>>> submitted"?  I do not see any driver in the kernel you are talking about.
>>
>> https://www.marc.info/?l=linux-pci&m=141547043110684&w=2
>
> Yes it also looks similar to me. Your code also contains the same
> comments as the driver used on Northstar (BCM5301X).Your driver has
> some more features, but I just have access to the consumer SoC Northstar
> where the PCIe controller is only used to connect some Broadcom Wifi
> chips to the SoC. I do not know If this controller does not have these
> features or the driver I used as a reference does not implement them.
>
Right, I wrote this driver based on some old Broadcom internal PCIe 
driver from a 3.6 kernel and might have copied some of the comments 
(especially in the check link function). The 3.6 driver is probably what 
you received?

> When I find some time I will try this driver on a Northstar device. I
> think your driver is more advanced then the one I send to the mailing list.
>
Please do that. I tested this driver on Cygnus and one of my colleagues 
helped to test it on North Star Plus. We do expect the same driver to 
work on NorthStar as well.

> When you want to stay with pure device tree I will send a patch adding
> additional support for registering to bcma.
>
What exactly is bcma? I guess I'll need to look into it in more details 
myself.

> Does your SoC also have a third PCIe controller which shares the PHY
> with the USB 3 controller?
No. Cygnus has only two PCIe controllers, each has its own dedicated PHY.

>
> Why is this stuff in the iproc_pcie_check_link() function needed? I
> think it is strange that the controller driver has to check if the
> device is there and set the correct speed. When we do not check if the
> card is there on BCM5301X the device stops working.
>
I need to check with our ASIC engineer on this. In theory we should be 
able to support hot plug eventually, but maybe not in the initial 
version of this driver.

>>>> Are you sure that iProc isn't based on the BCMA bus infrastructure after
>>>> all? Even the physical address of your PCI host falls into the address
>>>> range that is used for the internal BCMA bus on the other chips!
>>>
>>> BCMA seems to be for MIPS architectures.  It seems to be quite specific to
>>> those architectures using BCMA.  I see no use of it in bcm53xx code?
>>
>> BCMA lives in its own directory in drivers/bcma/ and is not specific
>> to MIPS actually. Older BCM47xx/BCM53xx MIPS-based SoCs traditionally
>> started with a discoverable Silicon Sonics Backplane (drivers/ssb) and
>> progressively migrated to BCMA (drivers/bcma), both subsystems offer a
>> very similar bus/device/driver abstraction and discovery mechanism.
>
> With mainline kernel 3.18 you can boot Linux on a BCM5301X SoC and bcma
> will find all the cores.
>
> Hauke
>

Re: [PATCH v4 2/5] gpio: Cygnus: add GPIO driver

[Ray Jui]

On 12/10/2014 2:34 AM, Alexandre Courbot wrote:
> On Tue, Dec 9, 2014 at 5:41 AM, Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org> wrote:
>> This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
>> SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller, 2) the
>> chipCommonG GPIO controller, and 3) the ALWAYS-ON GPIO controller
>>
>> Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>> Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>> ---
>>   drivers/gpio/Kconfig           |   11 +
>>   drivers/gpio/Makefile          |    1 +
>>   drivers/gpio/gpio-bcm-cygnus.c |  705 ++++++++++++++++++++++++++++++++++++++++
>>   3 files changed, 717 insertions(+)
>>   create mode 100644 drivers/gpio/gpio-bcm-cygnus.c
>>
>> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
>> index 633ec21..3e3b0342 100644
>> --- a/drivers/gpio/Kconfig
>> +++ b/drivers/gpio/Kconfig
>> @@ -126,6 +126,17 @@ config GPIO_74XX_MMIO
>>              8 bits:     74244 (Input), 74273 (Output)
>>              16 bits:    741624 (Input), 7416374 (Output)
>>
>> +config GPIO_BCM_CYGNUS
>> +       bool "Broadcom Cygnus GPIO support"
>> +       depends on ARCH_BCM_CYGNUS && OF_GPIO
>> +       help
>> +         Say yes here to turn on GPIO support for Broadcom Cygnus SoC
>> +
>> +         The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
>> +         GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
>> +         the always-ON GPIO controller (CRMU). All 3 GPIO controllers are
>> +         supported by this driver
>> +
>>   config GPIO_CLPS711X
>>          tristate "CLPS711X GPIO support"
>>          depends on ARCH_CLPS711X || COMPILE_TEST
>> diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
>> index 81755f1..31eb7e0 100644
>> --- a/drivers/gpio/Makefile
>> +++ b/drivers/gpio/Makefile
>> @@ -19,6 +19,7 @@ obj-$(CONFIG_GPIO_ADP5520)    += gpio-adp5520.o
>>   obj-$(CONFIG_GPIO_ADP5588)     += gpio-adp5588.o
>>   obj-$(CONFIG_GPIO_AMD8111)     += gpio-amd8111.o
>>   obj-$(CONFIG_GPIO_ARIZONA)     += gpio-arizona.o
>> +obj-$(CONFIG_GPIO_BCM_CYGNUS)  += gpio-bcm-cygnus.o
>>   obj-$(CONFIG_GPIO_BCM_KONA)    += gpio-bcm-kona.o
>>   obj-$(CONFIG_GPIO_BT8XX)       += gpio-bt8xx.o
>>   obj-$(CONFIG_GPIO_CLPS711X)    += gpio-clps711x.o
>> diff --git a/drivers/gpio/gpio-bcm-cygnus.c b/drivers/gpio/gpio-bcm-cygnus.c
>> new file mode 100644
>> index 0000000..4fd9b73
>> --- /dev/null
>> +++ b/drivers/gpio/gpio-bcm-cygnus.c
>> @@ -0,0 +1,705 @@
>> +/*
>> + * Copyright (C) 2014 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/slab.h>
>> +#include <linux/module.h>
>> +#include <linux/irq.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/io.h>
>> +#include <linux/gpio.h>
>> +#include <linux/ioport.h>
>> +#include <linux/of_device.h>
>> +#include <linux/of_irq.h>
>> +#include <linux/irqchip/chained_irq.h>
>> +
>> +#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
>> +#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
>> +#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
>> +#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
>> +#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
>> +#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
>> +#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
>> +#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
>> +#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
>> +#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
>> +#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
>> +#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
>> +
>> +/* drive strength control for ASIU GPIO */
>> +#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
>> +
>> +/* drive strength control for CCM GPIO */
>> +#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00
>> +
>> +#define GPIO_BANK_SIZE 0x200
>> +#define NGPIOS_PER_BANK 32
>> +#define GPIO_BIT(pin) ((pin) % NGPIOS_PER_BANK)
>> +#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
>> +
>> +#define GPIO_FLAG_BIT_MASK           0xffff
>> +#define GPIO_PULL_BIT_SHIFT          16
>> +#define GPIO_PULL_BIT_MASK           0x3
>> +
>> +#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
>> +#define GPIO_DRV_STRENGTH_BITS       3
>> +#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
>> +
>> +/*
>> + * For GPIO internal pull up/down registers
>> + */
>> +enum gpio_pull {
>> +       GPIO_PULL_NONE = 0,
>> +       GPIO_PULL_UP,
>> +       GPIO_PULL_DOWN,
>> +       GPIO_PULL_INVALID,
>> +};
>> +
>> +/*
>> + * GPIO drive strength
>> + */
>> +enum gpio_drv_strength {
>> +       GPIO_DRV_STRENGTH_2MA = 0,
>> +       GPIO_DRV_STRENGTH_4MA,
>> +       GPIO_DRV_STRENGTH_6MA,
>> +       GPIO_DRV_STRENGTH_8MA,
>> +       GPIO_DRV_STRENGTH_10MA,
>> +       GPIO_DRV_STRENGTH_12MA,
>> +       GPIO_DRV_STRENGTH_14MA,
>> +       GPIO_DRV_STRENGTH_16MA,
>> +       GPIO_DRV_STRENGTH_INVALID,
>> +};
>> +
>> +struct bcm_cygnus_gpio {
>> +       struct device *dev;
>> +       void __iomem *base;
>> +       void __iomem *io_ctrl;
>> +       spinlock_t lock;
>> +       struct gpio_chip gc;
>> +       unsigned num_banks;
>> +       int irq;
>> +       struct irq_domain *irq_domain;
>> +};
>> +
>> +static unsigned int gpio_base_index;
>
> Nope. What happens if there are other GPIO controllers with
> conflicting base GPIOs? I guess this adds more weight to that
> "linux,gpio-base" property I mentioned in
> http://www.spinics.net/lists/arm-kernel/msg384847.html .
>
> The best solution would be for users of the GPIOs provided by this
> driver to not rely on GPIO numbers at all, and exclusively use the
> gpiod interface. Is that an option for you?
>
Doesn't sysfs still rely the global GPIO number? We need to support the 
sysfs GPIO entries because some of our customers are using that for GPIO 
configuration.

I can definitely change the code to use device tree property 
"linux,gpio-base" though.

>> +
>> +static struct bcm_cygnus_gpio *to_bcm_cygnus_gpio(struct gpio_chip *gc)
>> +{
>> +       return container_of(gc, struct bcm_cygnus_gpio, gc);
>> +}
>> +
>> +static int bcm_cygnus_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
>> +{
>> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
>> +
>> +       return irq_find_mapping(cygnus_gpio->irq_domain, offset);
>> +}
>> +
>> +static unsigned int __gpio_reg_offset(struct bcm_cygnus_gpio *cygnus_gpio,
>> +               unsigned gpio)
>> +{
>> +       return GPIO_BANK(gpio) * GPIO_BANK_SIZE;
>> +}
>
> The cygnus_gpio argument in this function is unused. The compiler is
> supposed to signal such issues. Have you looked at your compiler
> output?
>
Let me change it to marco GPIO_REG(gpio) as you suggested.

>> +
>> +static unsigned int __gpio_bitpos(struct bcm_cygnus_gpio *cygnus_gpio,
>> +               unsigned gpio)
>> +{
>> +       return GPIO_BIT(gpio);
>> +}
>
> Same here. Also they are so simple that macros would be more adequate
> here I believe:
>
Agreed.

> #define CYGNUS_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + reg)
> #define CYGNUS_GPIO_SHIFT(pin) (pin % NGPIOS_PER_BANK) /* and remove
> the GPIO_BIT macro */
>
Right. The two macros make it simpler. Especially CYGNUS_GPIO_REG that 
takes the register offset as well. Will make the change.

>> +
>> +static void bcm_cygnus_gpio_irq_handler(unsigned int irq,
>> +               struct irq_desc *desc)
>> +{
>> +       struct bcm_cygnus_gpio *cygnus_gpio;
>> +       struct irq_chip *chip = irq_desc_get_chip(desc);
>> +       int i, bit;
>> +
>> +       chained_irq_enter(chip, desc);
>> +
>> +       cygnus_gpio = irq_get_handler_data(irq);
>> +
>> +       /* go through the entire GPIO banks and handle all interrupts */
>> +       for (i = 0; i < cygnus_gpio->num_banks; i++) {
>> +               unsigned long val = readl(cygnus_gpio->base +
>> +                               (i * GPIO_BANK_SIZE) +
>> +                               CYGNUS_GPIO_INT_MSTAT_OFFSET);
>
> Can you add cygnus_readl() and cygnus_writel() functions to avoid
> explicitly doing this operation on cygnus_gpio->base every time? It
> would be clearer and less error-prone.
>
Hmmm...But 'base' isn't the only register block that we access in this 
driver. There's also 'io_ctrl'.

What I can do is to introduce cygnus_readl() and cygnus_writel() like 
you suggested, and in the particular function 
bcm_cygnus_gpio_set_strength where io_ctrl register is needed, still use 
the normal readl and writel functions.

>> +
>> +               for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
>> +                       unsigned pin = NGPIOS_PER_BANK * i + bit;
>> +                       int child_irq =
>> +                               bcm_cygnus_gpio_to_irq(&cygnus_gpio->gc, pin);
>> +
>> +                       /*
>> +                        * Clear the interrupt before invoking the
>> +                        * handler, so we do not leave any window
>> +                        */
>> +                       writel(1 << bit,
>> +                               cygnus_gpio->base + (i * GPIO_BANK_SIZE) +
>> +                               CYGNUS_GPIO_INT_CLR_OFFSET);
>> +
>> +                       generic_handle_irq(child_irq);
>> +               }
>> +       }
>> +
>> +       chained_irq_exit(chip, desc);
>> +}
>> +
>> +static void bcm_cygnus_gpio_irq_ack(struct irq_data *d)
>> +{
>> +       struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
>> +       unsigned gpio = d->hwirq;
>> +       unsigned int offset, shift;
>> +       u32 val;
>> +
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_INT_CLR_OFFSET;
>> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
>> +
>> +       val = 1 << shift;
>
> val = BIT(shift);
>
Will change.

>> +       writel(val, cygnus_gpio->base + offset);
>> +
>> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
>> +                       offset, shift);
>> +}
>> +
>> +static void bcm_cygnus_gpio_irq_mask(struct irq_data *d)
>> +{
>> +       struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
>> +       unsigned gpio = d->hwirq;
>> +       unsigned int offset, shift;
>> +       u32 val;
>> +       unsigned long flags;
>> +
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_INT_MSK_OFFSET;
>> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
>> +
>> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
>> +
>> +       val = readl(cygnus_gpio->base + offset);
>> +       val &= ~(1 << shift);
>
> val &= ~BIT(shift);
>
Yes.

>> +       writel(val, cygnus_gpio->base + offset);
>> +
>> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
>> +
>> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
>> +                       offset, shift);
>> +}
>> +
>> +static void bcm_cygnus_gpio_irq_unmask(struct irq_data *d)
>> +{
>> +       struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
>> +       unsigned gpio = d->hwirq;
>> +       unsigned int offset, shift;
>> +       u32 val;
>> +       unsigned long flags;
>> +
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_INT_MSK_OFFSET;
>> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
>> +
>> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
>> +
>> +       val = readl(cygnus_gpio->base + offset);
>> +       val |= 1 << shift;
>
> val |= BIT(shift);
>
> Same remark everywhere it applies in this file.
>
Got it. Will go through the entire driver again and use 'BIT' where it 
applies.

>> +       writel(val, cygnus_gpio->base + offset);
>> +
>> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
>> +
>> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
>> +                       offset, shift);
>> +}
>
> It seems like you can factorize bcm_cygnus_gpio_irq_mask() and
> bcm_cygnus_gpio_irq_unmask() into one function which prototype would
> be, say:
>
> static void bcm_cygnus_gpio_irq_set_mask(struct irq_data *d, int mask);
>
> which would set of clear the bit according to the value of mask. Then
> your two mask/unmask functions would just need to call this one,
> reducing the amount of redundant code.
>
> Also I noticed that this driver has lots of readl()/twiddle
> bit/writel() sequences. Maybe it would make sense to have a
> cygnus_set_bit(chip, reg, gpio, set) function to factorize this:
>
> void cygnus_set_bit(chip, reg, gpio, set)
> {
>      unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
>      unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
>      u32 val;
>
>      val = cygnus_readl(chip, offset);
>      if (set)
>          val |= BIT(shift);
>      else
>          val &= ~BIT(shift);
>      cygnus_writel(chip, offset, val);
> }
>
Okay. Need to go through the entire driver and make the change.

>> +
>> +static int bcm_cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
>> +{
>> +       struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
>> +       unsigned gpio = d->hwirq;
>> +       unsigned int int_type, dual_edge, edge_lvl;
>> +       unsigned int offset, shift;
>> +       u32 val;
>> +       unsigned long flags;
>> +
>> +       switch (type & IRQ_TYPE_SENSE_MASK) {
>> +       case IRQ_TYPE_EDGE_RISING:
>> +               int_type = 0;
>> +               dual_edge = 0;
>> +               edge_lvl = 1;
>> +               break;
>> +
>> +       case IRQ_TYPE_EDGE_FALLING:
>> +               int_type = 0;
>> +               dual_edge = 0;
>> +               edge_lvl = 0;
>> +               break;
>> +
>> +       case IRQ_TYPE_EDGE_BOTH:
>> +               int_type = 0;
>> +               dual_edge = 1;
>> +               edge_lvl = 0;
>> +               break;
>> +
>> +       case IRQ_TYPE_LEVEL_HIGH:
>> +               int_type = 1;
>> +               dual_edge = 0;
>> +               edge_lvl = 1;
>> +               break;
>> +
>> +       case IRQ_TYPE_LEVEL_LOW:
>> +               int_type = 1;
>> +               dual_edge = 0;
>> +               edge_lvl = 0;
>> +               break;
>> +
>> +       default:
>> +               dev_err(cygnus_gpio->dev, "invalid GPIO irq type 0x%x\n", type);
>> +               return -EINVAL;
>> +       }
>> +
>> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
>> +
>> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_IN_TYPE_OFFSET;
>> +       val = readl(cygnus_gpio->base + offset);
>> +       val &= ~(1 << shift);
>> +       val |= int_type << shift;
>> +       writel(val, cygnus_gpio->base + offset);
>> +
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_INT_DE_OFFSET;
>> +       val = readl(cygnus_gpio->base + offset);
>> +       val &= ~(1 << shift);
>> +       val |= dual_edge << shift;
>> +       writel(val, cygnus_gpio->base + offset);
>> +
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_INT_EDGE_OFFSET;
>> +       val = readl(cygnus_gpio->base + offset);
>> +       val &= ~(1 << shift);
>> +       val |= edge_lvl << shift;
>> +       writel(val, cygnus_gpio->base + offset);
>
> With the functions/macros suggested above I think you could change the
> 3 blocks above into something like:
>
> cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_IN_TYPE_OFFSET, gpio, int_type);
> cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_INT_DE_OFFSET, gpio, dual_edge);
> cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_INT_EDGE_OFFSET, gpio, edge_lvl);
>
Yes. Indeed a lot simpler and easier to read. Thanks.

>> +
>> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
>> +
>> +       return 0;
>> +}
>> +
>> +static struct irq_chip bcm_cygnus_gpio_irq_chip = {
>> +       .name = "bcm-cygnus-gpio",
>> +       .irq_ack = bcm_cygnus_gpio_irq_ack,
>> +       .irq_mask = bcm_cygnus_gpio_irq_mask,
>> +       .irq_unmask = bcm_cygnus_gpio_irq_unmask,
>> +       .irq_set_type = bcm_cygnus_gpio_irq_set_type,
>> +};
>> +
>> +static int bcm_cygnus_gpio_direction_input(struct gpio_chip *gc,
>> +               unsigned gpio)
>> +{
>> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
>> +       unsigned int offset, shift;
>> +       u32 val;
>> +       unsigned long flags;
>> +
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_OUT_EN_OFFSET;
>> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
>> +
>> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
>> +
>> +       val = readl(cygnus_gpio->base + offset);
>> +       val &= ~(1 << shift);
>> +       writel(val, cygnus_gpio->base + offset);
>> +
>> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
>> +
>> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
>> +                       offset, shift);
>> +
>> +       return 0;
>> +}
>> +
>> +static int bcm_cygnus_gpio_direction_output(struct gpio_chip *gc,
>> +               unsigned gpio, int value)
>> +{
>> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
>> +       unsigned int offset, shift;
>> +       u32 val;
>> +       unsigned long flags;
>> +
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_OUT_EN_OFFSET;
>> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
>> +
>> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
>> +
>> +       val = readl(cygnus_gpio->base + offset);
>> +       val |= 1 << shift;
>> +       writel(val, cygnus_gpio->base + offset);
>> +
>> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
>> +                       offset, shift);
>> +
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_DATA_OUT_OFFSET;
>> +
>> +       val = readl(cygnus_gpio->base + offset);
>> +       if (value)
>> +               val |= 1 << shift;
>> +       else
>> +               val &= ~(1 << shift);
>> +       writel(val, cygnus_gpio->base + offset);
>
> And here you would have:
>
> cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 1);
> cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
>
> Many other sites in this file could be simplified this way.
>
Yes. Will make the change.

>> +
>> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
>> +
>> +       dev_dbg(cygnus_gpio->dev,
>> +               "gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
>> +               gpio, offset, shift, val);
>> +
>> +       return 0;
>> +}
>> +
>> +static void bcm_cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio,
>> +               int value)
>> +{
>> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
>> +       unsigned int offset, shift;
>> +       u32 val;
>> +       unsigned long flags;
>> +
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_DATA_OUT_OFFSET;
>> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
>> +
>> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
>> +
>> +       val = readl(cygnus_gpio->base + offset);
>> +       if (value)
>> +               val |= 1 << shift;
>> +       else
>> +               val &= ~(1 << shift);
>> +       writel(val, cygnus_gpio->base + offset);
>> +
>> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
>> +
>> +       dev_dbg(cygnus_gpio->dev,
>> +               "gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
>> +               gpio, offset, shift, val);
>> +}
>> +
>> +static int bcm_cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
>> +{
>> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
>> +       unsigned int offset, shift;
>> +       u32 val;
>> +
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_DATA_IN_OFFSET;
>> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
>> +
>> +       val = readl(cygnus_gpio->base + offset);
>> +       val = (val >> shift) & 1;
>> +
>> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u val:%u\n",
>> +                       gpio, offset, shift, val);
>> +
>> +       return val;
>> +}
>> +
>> +static struct lock_class_key gpio_lock_class;
>> +
>> +static int bcm_cygnus_gpio_irq_map(struct irq_domain *d, unsigned int irq,
>> +                                irq_hw_number_t hwirq)
>> +{
>> +       int ret;
>> +
>> +       ret = irq_set_chip_data(irq, d->host_data);
>> +       if (ret < 0)
>> +               return ret;
>> +       irq_set_lockdep_class(irq, &gpio_lock_class);
>> +       irq_set_chip_and_handler(irq, &bcm_cygnus_gpio_irq_chip,
>> +                       handle_simple_irq);
>> +       set_irq_flags(irq, IRQF_VALID);
>> +
>> +       return 0;
>> +}
>> +
>> +static void bcm_cygnus_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
>> +{
>> +       irq_set_chip_and_handler(irq, NULL, NULL);
>> +       irq_set_chip_data(irq, NULL);
>> +}
>> +
>> +static struct irq_domain_ops bcm_cygnus_irq_ops = {
>> +       .map = bcm_cygnus_gpio_irq_map,
>> +       .unmap = bcm_cygnus_gpio_irq_unmap,
>> +       .xlate = irq_domain_xlate_twocell,
>> +};
>> +
>> +#ifdef CONFIG_OF_GPIO
>> +static void bcm_cygnus_gpio_set_pull(struct bcm_cygnus_gpio *cygnus_gpio,
>> +               unsigned gpio, enum gpio_pull pull)
>> +{
>> +       unsigned int offset, shift;
>> +       u32 val, pullup;
>> +       unsigned long flags;
>> +
>> +       switch (pull) {
>> +       case GPIO_PULL_UP:
>> +               pullup = 1;
>> +               break;
>> +       case GPIO_PULL_DOWN:
>> +               pullup = 0;
>> +               break;
>> +       case GPIO_PULL_NONE:
>> +       case GPIO_PULL_INVALID:
>> +       default:
>> +               return;
>> +       }
>> +
>> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
>> +
>> +       /* set pull up/down */
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_PAD_RES_OFFSET;
>> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
>> +
>> +       val = readl(cygnus_gpio->base + offset);
>> +       val &= ~(1 << shift);
>> +       if (pullup)
>> +               val |= 1 << shift;
>> +       writel(val, cygnus_gpio->base + offset);
>> +
>> +       /* enable pad */
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_RES_EN_OFFSET;
>> +       val = readl(cygnus_gpio->base + offset);
>> +       val |= 1 << shift;
>> +       writel(val, cygnus_gpio->base + offset);
>> +
>> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
>> +}
>> +
>> +static void bcm_cygnus_gpio_set_strength(struct bcm_cygnus_gpio *cygnus_gpio,
>> +               unsigned gpio, enum gpio_drv_strength strength)
>> +{
>> +       struct device *dev = cygnus_gpio->dev;
>> +       void __iomem *base;
>> +       unsigned int i, offset, shift;
>> +       u32 val;
>> +       unsigned long flags;
>> +
>> +       /* some GPIO controllers do not support drive strength configuration */
>> +       if (of_find_property(dev->of_node, "no-drv-strength", NULL))
>> +               return;
>> +
>> +       if (cygnus_gpio->io_ctrl) {
>> +               base = cygnus_gpio->io_ctrl;
>> +               offset = CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET;
>> +       } else {
>> +               base = cygnus_gpio->base;
>> +               offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +                       CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET;
>> +       }
>> +
>> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
>> +
>> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
>> +
>> +       for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
>> +               val = readl(base + offset);
>> +               val &= ~(1 << shift);
>> +               val |= ((strength >> i) & 0x1) << shift;
>> +               writel(val, base + offset);
>> +               offset += 4;
>> +       }
>> +
>> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
>> +}
>> +
>> +static int bcm_cygnus_gpio_of_xlate(struct gpio_chip *gc,
>> +               const struct of_phandle_args *gpiospec, u32 *flags)
>> +{
>> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
>> +       enum gpio_pull pull;
>> +       enum gpio_drv_strength strength;
>> +
>> +       if (gc->of_gpio_n_cells < 2)
>> +               return -EINVAL;
>> +
>> +       if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
>> +               return -EINVAL;
>> +
>> +       if (gpiospec->args[0] >= gc->ngpio)
>> +               return -EINVAL;
>> +
>> +       pull = (gpiospec->args[1] >> GPIO_PULL_BIT_SHIFT) & GPIO_PULL_BIT_MASK;
>> +       if (WARN_ON(pull >= GPIO_PULL_INVALID))
>> +               return -EINVAL;
>> +
>> +       strength = (gpiospec->args[1] >> GPIO_DRV_STRENGTH_BIT_SHIFT) &
>> +               GPIO_DRV_STRENGTH_BIT_MASK;
>> +
>> +       if (flags)
>> +               *flags = gpiospec->args[1] & GPIO_FLAG_BIT_MASK;
>> +
>> +       bcm_cygnus_gpio_set_pull(cygnus_gpio, gpiospec->args[0], pull);
>> +       bcm_cygnus_gpio_set_strength(cygnus_gpio, gpiospec->args[0], strength);
>> +
>> +       return gpiospec->args[0];
>> +}
>> +#endif
>> +
>> +static const struct of_device_id bcm_cygnus_gpio_of_match[] = {
>> +       { .compatible = "brcm,cygnus-gpio" },
>> +       { }
>> +};
>> +MODULE_DEVICE_TABLE(of, bcm_cygnus_gpio_of_match);
>> +
>> +static int bcm_cygnus_gpio_probe(struct platform_device *pdev)
>> +{
>> +       struct device *dev = &pdev->dev;
>> +       const struct of_device_id *match;
>> +       struct resource *res;
>> +       struct bcm_cygnus_gpio *cygnus_gpio;
>> +       struct gpio_chip *gc;
>> +       u32 i, ngpios;
>> +       int ret;
>> +
>> +       match = of_match_device(bcm_cygnus_gpio_of_match, dev);
>> +       if (!match) {
>> +               dev_err(&pdev->dev, "failed to find GPIO controller\n");
>> +               return -ENODEV;
>> +       }
>
> Do you still need that block of code? match is never used in this function.
>
Will get rid of it. Pretty much a redundant check.

> ... well, I think you get the drill. Let's first start by factorizing
> as much code as can be to make this driver easier to read (I have a
> few leads, but I am sure there are other similar factorizations that
> can be made). Let's also get rid of this static gpio_base_index
> variable that effectively prevents any other GPIO driver from being
> used alongside with this one. If you really need to use global GPIO
> numbers, let's see if Linus agrees for that "linux,gpio-base" DT
> property that would certainly make many people happy.
>
Will make the change. Thanks for the review. Very helpful!

We do need to use global GPIO numbers, at least before sysfs GPIO 
interface is updated to use gpiod. I'm fine with using 
"linux,gpio-base". Btw, I assume that's per GPIO controller based device 
tree property, correct?
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Re: [PATCH v4 2/5] gpio: Cygnus: add GPIO driver

[Ray Jui]

On 12/10/2014 2:34 AM, Alexandre Courbot wrote:
> On Tue, Dec 9, 2014 at 5:41 AM, Ray Jui <rjui@broadcom.com> wrote:
>> This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
>> SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller, 2) the
>> chipCommonG GPIO controller, and 3) the ALWAYS-ON GPIO controller
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>> ---
>>   drivers/gpio/Kconfig           |   11 +
>>   drivers/gpio/Makefile          |    1 +
>>   drivers/gpio/gpio-bcm-cygnus.c |  705 ++++++++++++++++++++++++++++++++++++++++
>>   3 files changed, 717 insertions(+)
>>   create mode 100644 drivers/gpio/gpio-bcm-cygnus.c
>>
>> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
>> index 633ec21..3e3b0342 100644
>> --- a/drivers/gpio/Kconfig
>> +++ b/drivers/gpio/Kconfig
>> @@ -126,6 +126,17 @@ config GPIO_74XX_MMIO
>>              8 bits:     74244 (Input), 74273 (Output)
>>              16 bits:    741624 (Input), 7416374 (Output)
>>
>> +config GPIO_BCM_CYGNUS
>> +       bool "Broadcom Cygnus GPIO support"
>> +       depends on ARCH_BCM_CYGNUS && OF_GPIO
>> +       help
>> +         Say yes here to turn on GPIO support for Broadcom Cygnus SoC
>> +
>> +         The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
>> +         GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
>> +         the always-ON GPIO controller (CRMU). All 3 GPIO controllers are
>> +         supported by this driver
>> +
>>   config GPIO_CLPS711X
>>          tristate "CLPS711X GPIO support"
>>          depends on ARCH_CLPS711X || COMPILE_TEST
>> diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
>> index 81755f1..31eb7e0 100644
>> --- a/drivers/gpio/Makefile
>> +++ b/drivers/gpio/Makefile
>> @@ -19,6 +19,7 @@ obj-$(CONFIG_GPIO_ADP5520)    += gpio-adp5520.o
>>   obj-$(CONFIG_GPIO_ADP5588)     += gpio-adp5588.o
>>   obj-$(CONFIG_GPIO_AMD8111)     += gpio-amd8111.o
>>   obj-$(CONFIG_GPIO_ARIZONA)     += gpio-arizona.o
>> +obj-$(CONFIG_GPIO_BCM_CYGNUS)  += gpio-bcm-cygnus.o
>>   obj-$(CONFIG_GPIO_BCM_KONA)    += gpio-bcm-kona.o
>>   obj-$(CONFIG_GPIO_BT8XX)       += gpio-bt8xx.o
>>   obj-$(CONFIG_GPIO_CLPS711X)    += gpio-clps711x.o
>> diff --git a/drivers/gpio/gpio-bcm-cygnus.c b/drivers/gpio/gpio-bcm-cygnus.c
>> new file mode 100644
>> index 0000000..4fd9b73
>> --- /dev/null
>> +++ b/drivers/gpio/gpio-bcm-cygnus.c
>> @@ -0,0 +1,705 @@
>> +/*
>> + * Copyright (C) 2014 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/slab.h>
>> +#include <linux/module.h>
>> +#include <linux/irq.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/io.h>
>> +#include <linux/gpio.h>
>> +#include <linux/ioport.h>
>> +#include <linux/of_device.h>
>> +#include <linux/of_irq.h>
>> +#include <linux/irqchip/chained_irq.h>
>> +
>> +#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
>> +#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
>> +#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
>> +#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
>> +#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
>> +#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
>> +#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
>> +#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
>> +#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
>> +#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
>> +#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
>> +#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
>> +
>> +/* drive strength control for ASIU GPIO */
>> +#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
>> +
>> +/* drive strength control for CCM GPIO */
>> +#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00
>> +
>> +#define GPIO_BANK_SIZE 0x200
>> +#define NGPIOS_PER_BANK 32
>> +#define GPIO_BIT(pin) ((pin) % NGPIOS_PER_BANK)
>> +#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
>> +
>> +#define GPIO_FLAG_BIT_MASK           0xffff
>> +#define GPIO_PULL_BIT_SHIFT          16
>> +#define GPIO_PULL_BIT_MASK           0x3
>> +
>> +#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
>> +#define GPIO_DRV_STRENGTH_BITS       3
>> +#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
>> +
>> +/*
>> + * For GPIO internal pull up/down registers
>> + */
>> +enum gpio_pull {
>> +       GPIO_PULL_NONE = 0,
>> +       GPIO_PULL_UP,
>> +       GPIO_PULL_DOWN,
>> +       GPIO_PULL_INVALID,
>> +};
>> +
>> +/*
>> + * GPIO drive strength
>> + */
>> +enum gpio_drv_strength {
>> +       GPIO_DRV_STRENGTH_2MA = 0,
>> +       GPIO_DRV_STRENGTH_4MA,
>> +       GPIO_DRV_STRENGTH_6MA,
>> +       GPIO_DRV_STRENGTH_8MA,
>> +       GPIO_DRV_STRENGTH_10MA,
>> +       GPIO_DRV_STRENGTH_12MA,
>> +       GPIO_DRV_STRENGTH_14MA,
>> +       GPIO_DRV_STRENGTH_16MA,
>> +       GPIO_DRV_STRENGTH_INVALID,
>> +};
>> +
>> +struct bcm_cygnus_gpio {
>> +       struct device *dev;
>> +       void __iomem *base;
>> +       void __iomem *io_ctrl;
>> +       spinlock_t lock;
>> +       struct gpio_chip gc;
>> +       unsigned num_banks;
>> +       int irq;
>> +       struct irq_domain *irq_domain;
>> +};
>> +
>> +static unsigned int gpio_base_index;
>
> Nope. What happens if there are other GPIO controllers with
> conflicting base GPIOs? I guess this adds more weight to that
> "linux,gpio-base" property I mentioned in
> http://www.spinics.net/lists/arm-kernel/msg384847.html .
>
> The best solution would be for users of the GPIOs provided by this
> driver to not rely on GPIO numbers at all, and exclusively use the
> gpiod interface. Is that an option for you?
>
Doesn't sysfs still rely the global GPIO number? We need to support the 
sysfs GPIO entries because some of our customers are using that for GPIO 
configuration.

I can definitely change the code to use device tree property 
"linux,gpio-base" though.

>> +
>> +static struct bcm_cygnus_gpio *to_bcm_cygnus_gpio(struct gpio_chip *gc)
>> +{
>> +       return container_of(gc, struct bcm_cygnus_gpio, gc);
>> +}
>> +
>> +static int bcm_cygnus_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
>> +{
>> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
>> +
>> +       return irq_find_mapping(cygnus_gpio->irq_domain, offset);
>> +}
>> +
>> +static unsigned int __gpio_reg_offset(struct bcm_cygnus_gpio *cygnus_gpio,
>> +               unsigned gpio)
>> +{
>> +       return GPIO_BANK(gpio) * GPIO_BANK_SIZE;
>> +}
>
> The cygnus_gpio argument in this function is unused. The compiler is
> supposed to signal such issues. Have you looked at your compiler
> output?
>
Let me change it to marco GPIO_REG(gpio) as you suggested.

>> +
>> +static unsigned int __gpio_bitpos(struct bcm_cygnus_gpio *cygnus_gpio,
>> +               unsigned gpio)
>> +{
>> +       return GPIO_BIT(gpio);
>> +}
>
> Same here. Also they are so simple that macros would be more adequate
> here I believe:
>
Agreed.

> #define CYGNUS_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + reg)
> #define CYGNUS_GPIO_SHIFT(pin) (pin % NGPIOS_PER_BANK) /* and remove
> the GPIO_BIT macro */
>
Right. The two macros make it simpler. Especially CYGNUS_GPIO_REG that 
takes the register offset as well. Will make the change.

>> +
>> +static void bcm_cygnus_gpio_irq_handler(unsigned int irq,
>> +               struct irq_desc *desc)
>> +{
>> +       struct bcm_cygnus_gpio *cygnus_gpio;
>> +       struct irq_chip *chip = irq_desc_get_chip(desc);
>> +       int i, bit;
>> +
>> +       chained_irq_enter(chip, desc);
>> +
>> +       cygnus_gpio = irq_get_handler_data(irq);
>> +
>> +       /* go through the entire GPIO banks and handle all interrupts */
>> +       for (i = 0; i < cygnus_gpio->num_banks; i++) {
>> +               unsigned long val = readl(cygnus_gpio->base +
>> +                               (i * GPIO_BANK_SIZE) +
>> +                               CYGNUS_GPIO_INT_MSTAT_OFFSET);
>
> Can you add cygnus_readl() and cygnus_writel() functions to avoid
> explicitly doing this operation on cygnus_gpio->base every time? It
> would be clearer and less error-prone.
>
Hmmm...But 'base' isn't the only register block that we access in this 
driver. There's also 'io_ctrl'.

What I can do is to introduce cygnus_readl() and cygnus_writel() like 
you suggested, and in the particular function 
bcm_cygnus_gpio_set_strength where io_ctrl register is needed, still use 
the normal readl and writel functions.

>> +
>> +               for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
>> +                       unsigned pin = NGPIOS_PER_BANK * i + bit;
>> +                       int child_irq =
>> +                               bcm_cygnus_gpio_to_irq(&cygnus_gpio->gc, pin);
>> +
>> +                       /*
>> +                        * Clear the interrupt before invoking the
>> +                        * handler, so we do not leave any window
>> +                        */
>> +                       writel(1 << bit,
>> +                               cygnus_gpio->base + (i * GPIO_BANK_SIZE) +
>> +                               CYGNUS_GPIO_INT_CLR_OFFSET);
>> +
>> +                       generic_handle_irq(child_irq);
>> +               }
>> +       }
>> +
>> +       chained_irq_exit(chip, desc);
>> +}
>> +
>> +static void bcm_cygnus_gpio_irq_ack(struct irq_data *d)
>> +{
>> +       struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
>> +       unsigned gpio = d->hwirq;
>> +       unsigned int offset, shift;
>> +       u32 val;
>> +
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_INT_CLR_OFFSET;
>> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
>> +
>> +       val = 1 << shift;
>
> val = BIT(shift);
>
Will change.

>> +       writel(val, cygnus_gpio->base + offset);
>> +
>> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
>> +                       offset, shift);
>> +}
>> +
>> +static void bcm_cygnus_gpio_irq_mask(struct irq_data *d)
>> +{
>> +       struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
>> +       unsigned gpio = d->hwirq;
>> +       unsigned int offset, shift;
>> +       u32 val;
>> +       unsigned long flags;
>> +
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_INT_MSK_OFFSET;
>> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
>> +
>> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
>> +
>> +       val = readl(cygnus_gpio->base + offset);
>> +       val &= ~(1 << shift);
>
> val &= ~BIT(shift);
>
Yes.

>> +       writel(val, cygnus_gpio->base + offset);
>> +
>> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
>> +
>> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
>> +                       offset, shift);
>> +}
>> +
>> +static void bcm_cygnus_gpio_irq_unmask(struct irq_data *d)
>> +{
>> +       struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
>> +       unsigned gpio = d->hwirq;
>> +       unsigned int offset, shift;
>> +       u32 val;
>> +       unsigned long flags;
>> +
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_INT_MSK_OFFSET;
>> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
>> +
>> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
>> +
>> +       val = readl(cygnus_gpio->base + offset);
>> +       val |= 1 << shift;
>
> val |= BIT(shift);
>
> Same remark everywhere it applies in this file.
>
Got it. Will go through the entire driver again and use 'BIT' where it 
applies.

>> +       writel(val, cygnus_gpio->base + offset);
>> +
>> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
>> +
>> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
>> +                       offset, shift);
>> +}
>
> It seems like you can factorize bcm_cygnus_gpio_irq_mask() and
> bcm_cygnus_gpio_irq_unmask() into one function which prototype would
> be, say:
>
> static void bcm_cygnus_gpio_irq_set_mask(struct irq_data *d, int mask);
>
> which would set of clear the bit according to the value of mask. Then
> your two mask/unmask functions would just need to call this one,
> reducing the amount of redundant code.
>
> Also I noticed that this driver has lots of readl()/twiddle
> bit/writel() sequences. Maybe it would make sense to have a
> cygnus_set_bit(chip, reg, gpio, set) function to factorize this:
>
> void cygnus_set_bit(chip, reg, gpio, set)
> {
>      unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
>      unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
>      u32 val;
>
>      val = cygnus_readl(chip, offset);
>      if (set)
>          val |= BIT(shift);
>      else
>          val &= ~BIT(shift);
>      cygnus_writel(chip, offset, val);
> }
>
Okay. Need to go through the entire driver and make the change.

>> +
>> +static int bcm_cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
>> +{
>> +       struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
>> +       unsigned gpio = d->hwirq;
>> +       unsigned int int_type, dual_edge, edge_lvl;
>> +       unsigned int offset, shift;
>> +       u32 val;
>> +       unsigned long flags;
>> +
>> +       switch (type & IRQ_TYPE_SENSE_MASK) {
>> +       case IRQ_TYPE_EDGE_RISING:
>> +               int_type = 0;
>> +               dual_edge = 0;
>> +               edge_lvl = 1;
>> +               break;
>> +
>> +       case IRQ_TYPE_EDGE_FALLING:
>> +               int_type = 0;
>> +               dual_edge = 0;
>> +               edge_lvl = 0;
>> +               break;
>> +
>> +       case IRQ_TYPE_EDGE_BOTH:
>> +               int_type = 0;
>> +               dual_edge = 1;
>> +               edge_lvl = 0;
>> +               break;
>> +
>> +       case IRQ_TYPE_LEVEL_HIGH:
>> +               int_type = 1;
>> +               dual_edge = 0;
>> +               edge_lvl = 1;
>> +               break;
>> +
>> +       case IRQ_TYPE_LEVEL_LOW:
>> +               int_type = 1;
>> +               dual_edge = 0;
>> +               edge_lvl = 0;
>> +               break;
>> +
>> +       default:
>> +               dev_err(cygnus_gpio->dev, "invalid GPIO irq type 0x%x\n", type);
>> +               return -EINVAL;
>> +       }
>> +
>> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
>> +
>> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_IN_TYPE_OFFSET;
>> +       val = readl(cygnus_gpio->base + offset);
>> +       val &= ~(1 << shift);
>> +       val |= int_type << shift;
>> +       writel(val, cygnus_gpio->base + offset);
>> +
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_INT_DE_OFFSET;
>> +       val = readl(cygnus_gpio->base + offset);
>> +       val &= ~(1 << shift);
>> +       val |= dual_edge << shift;
>> +       writel(val, cygnus_gpio->base + offset);
>> +
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_INT_EDGE_OFFSET;
>> +       val = readl(cygnus_gpio->base + offset);
>> +       val &= ~(1 << shift);
>> +       val |= edge_lvl << shift;
>> +       writel(val, cygnus_gpio->base + offset);
>
> With the functions/macros suggested above I think you could change the
> 3 blocks above into something like:
>
> cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_IN_TYPE_OFFSET, gpio, int_type);
> cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_INT_DE_OFFSET, gpio, dual_edge);
> cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_INT_EDGE_OFFSET, gpio, edge_lvl);
>
Yes. Indeed a lot simpler and easier to read. Thanks.

>> +
>> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
>> +
>> +       return 0;
>> +}
>> +
>> +static struct irq_chip bcm_cygnus_gpio_irq_chip = {
>> +       .name = "bcm-cygnus-gpio",
>> +       .irq_ack = bcm_cygnus_gpio_irq_ack,
>> +       .irq_mask = bcm_cygnus_gpio_irq_mask,
>> +       .irq_unmask = bcm_cygnus_gpio_irq_unmask,
>> +       .irq_set_type = bcm_cygnus_gpio_irq_set_type,
>> +};
>> +
>> +static int bcm_cygnus_gpio_direction_input(struct gpio_chip *gc,
>> +               unsigned gpio)
>> +{
>> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
>> +       unsigned int offset, shift;
>> +       u32 val;
>> +       unsigned long flags;
>> +
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_OUT_EN_OFFSET;
>> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
>> +
>> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
>> +
>> +       val = readl(cygnus_gpio->base + offset);
>> +       val &= ~(1 << shift);
>> +       writel(val, cygnus_gpio->base + offset);
>> +
>> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
>> +
>> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
>> +                       offset, shift);
>> +
>> +       return 0;
>> +}
>> +
>> +static int bcm_cygnus_gpio_direction_output(struct gpio_chip *gc,
>> +               unsigned gpio, int value)
>> +{
>> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
>> +       unsigned int offset, shift;
>> +       u32 val;
>> +       unsigned long flags;
>> +
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_OUT_EN_OFFSET;
>> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
>> +
>> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
>> +
>> +       val = readl(cygnus_gpio->base + offset);
>> +       val |= 1 << shift;
>> +       writel(val, cygnus_gpio->base + offset);
>> +
>> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
>> +                       offset, shift);
>> +
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_DATA_OUT_OFFSET;
>> +
>> +       val = readl(cygnus_gpio->base + offset);
>> +       if (value)
>> +               val |= 1 << shift;
>> +       else
>> +               val &= ~(1 << shift);
>> +       writel(val, cygnus_gpio->base + offset);
>
> And here you would have:
>
> cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 1);
> cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
>
> Many other sites in this file could be simplified this way.
>
Yes. Will make the change.

>> +
>> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
>> +
>> +       dev_dbg(cygnus_gpio->dev,
>> +               "gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
>> +               gpio, offset, shift, val);
>> +
>> +       return 0;
>> +}
>> +
>> +static void bcm_cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio,
>> +               int value)
>> +{
>> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
>> +       unsigned int offset, shift;
>> +       u32 val;
>> +       unsigned long flags;
>> +
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_DATA_OUT_OFFSET;
>> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
>> +
>> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
>> +
>> +       val = readl(cygnus_gpio->base + offset);
>> +       if (value)
>> +               val |= 1 << shift;
>> +       else
>> +               val &= ~(1 << shift);
>> +       writel(val, cygnus_gpio->base + offset);
>> +
>> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
>> +
>> +       dev_dbg(cygnus_gpio->dev,
>> +               "gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
>> +               gpio, offset, shift, val);
>> +}
>> +
>> +static int bcm_cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
>> +{
>> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
>> +       unsigned int offset, shift;
>> +       u32 val;
>> +
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_DATA_IN_OFFSET;
>> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
>> +
>> +       val = readl(cygnus_gpio->base + offset);
>> +       val = (val >> shift) & 1;
>> +
>> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u val:%u\n",
>> +                       gpio, offset, shift, val);
>> +
>> +       return val;
>> +}
>> +
>> +static struct lock_class_key gpio_lock_class;
>> +
>> +static int bcm_cygnus_gpio_irq_map(struct irq_domain *d, unsigned int irq,
>> +                                irq_hw_number_t hwirq)
>> +{
>> +       int ret;
>> +
>> +       ret = irq_set_chip_data(irq, d->host_data);
>> +       if (ret < 0)
>> +               return ret;
>> +       irq_set_lockdep_class(irq, &gpio_lock_class);
>> +       irq_set_chip_and_handler(irq, &bcm_cygnus_gpio_irq_chip,
>> +                       handle_simple_irq);
>> +       set_irq_flags(irq, IRQF_VALID);
>> +
>> +       return 0;
>> +}
>> +
>> +static void bcm_cygnus_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
>> +{
>> +       irq_set_chip_and_handler(irq, NULL, NULL);
>> +       irq_set_chip_data(irq, NULL);
>> +}
>> +
>> +static struct irq_domain_ops bcm_cygnus_irq_ops = {
>> +       .map = bcm_cygnus_gpio_irq_map,
>> +       .unmap = bcm_cygnus_gpio_irq_unmap,
>> +       .xlate = irq_domain_xlate_twocell,
>> +};
>> +
>> +#ifdef CONFIG_OF_GPIO
>> +static void bcm_cygnus_gpio_set_pull(struct bcm_cygnus_gpio *cygnus_gpio,
>> +               unsigned gpio, enum gpio_pull pull)
>> +{
>> +       unsigned int offset, shift;
>> +       u32 val, pullup;
>> +       unsigned long flags;
>> +
>> +       switch (pull) {
>> +       case GPIO_PULL_UP:
>> +               pullup = 1;
>> +               break;
>> +       case GPIO_PULL_DOWN:
>> +               pullup = 0;
>> +               break;
>> +       case GPIO_PULL_NONE:
>> +       case GPIO_PULL_INVALID:
>> +       default:
>> +               return;
>> +       }
>> +
>> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
>> +
>> +       /* set pull up/down */
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_PAD_RES_OFFSET;
>> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
>> +
>> +       val = readl(cygnus_gpio->base + offset);
>> +       val &= ~(1 << shift);
>> +       if (pullup)
>> +               val |= 1 << shift;
>> +       writel(val, cygnus_gpio->base + offset);
>> +
>> +       /* enable pad */
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_RES_EN_OFFSET;
>> +       val = readl(cygnus_gpio->base + offset);
>> +       val |= 1 << shift;
>> +       writel(val, cygnus_gpio->base + offset);
>> +
>> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
>> +}
>> +
>> +static void bcm_cygnus_gpio_set_strength(struct bcm_cygnus_gpio *cygnus_gpio,
>> +               unsigned gpio, enum gpio_drv_strength strength)
>> +{
>> +       struct device *dev = cygnus_gpio->dev;
>> +       void __iomem *base;
>> +       unsigned int i, offset, shift;
>> +       u32 val;
>> +       unsigned long flags;
>> +
>> +       /* some GPIO controllers do not support drive strength configuration */
>> +       if (of_find_property(dev->of_node, "no-drv-strength", NULL))
>> +               return;
>> +
>> +       if (cygnus_gpio->io_ctrl) {
>> +               base = cygnus_gpio->io_ctrl;
>> +               offset = CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET;
>> +       } else {
>> +               base = cygnus_gpio->base;
>> +               offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +                       CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET;
>> +       }
>> +
>> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
>> +
>> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
>> +
>> +       for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
>> +               val = readl(base + offset);
>> +               val &= ~(1 << shift);
>> +               val |= ((strength >> i) & 0x1) << shift;
>> +               writel(val, base + offset);
>> +               offset += 4;
>> +       }
>> +
>> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
>> +}
>> +
>> +static int bcm_cygnus_gpio_of_xlate(struct gpio_chip *gc,
>> +               const struct of_phandle_args *gpiospec, u32 *flags)
>> +{
>> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
>> +       enum gpio_pull pull;
>> +       enum gpio_drv_strength strength;
>> +
>> +       if (gc->of_gpio_n_cells < 2)
>> +               return -EINVAL;
>> +
>> +       if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
>> +               return -EINVAL;
>> +
>> +       if (gpiospec->args[0] >= gc->ngpio)
>> +               return -EINVAL;
>> +
>> +       pull = (gpiospec->args[1] >> GPIO_PULL_BIT_SHIFT) & GPIO_PULL_BIT_MASK;
>> +       if (WARN_ON(pull >= GPIO_PULL_INVALID))
>> +               return -EINVAL;
>> +
>> +       strength = (gpiospec->args[1] >> GPIO_DRV_STRENGTH_BIT_SHIFT) &
>> +               GPIO_DRV_STRENGTH_BIT_MASK;
>> +
>> +       if (flags)
>> +               *flags = gpiospec->args[1] & GPIO_FLAG_BIT_MASK;
>> +
>> +       bcm_cygnus_gpio_set_pull(cygnus_gpio, gpiospec->args[0], pull);
>> +       bcm_cygnus_gpio_set_strength(cygnus_gpio, gpiospec->args[0], strength);
>> +
>> +       return gpiospec->args[0];
>> +}
>> +#endif
>> +
>> +static const struct of_device_id bcm_cygnus_gpio_of_match[] = {
>> +       { .compatible = "brcm,cygnus-gpio" },
>> +       { }
>> +};
>> +MODULE_DEVICE_TABLE(of, bcm_cygnus_gpio_of_match);
>> +
>> +static int bcm_cygnus_gpio_probe(struct platform_device *pdev)
>> +{
>> +       struct device *dev = &pdev->dev;
>> +       const struct of_device_id *match;
>> +       struct resource *res;
>> +       struct bcm_cygnus_gpio *cygnus_gpio;
>> +       struct gpio_chip *gc;
>> +       u32 i, ngpios;
>> +       int ret;
>> +
>> +       match = of_match_device(bcm_cygnus_gpio_of_match, dev);
>> +       if (!match) {
>> +               dev_err(&pdev->dev, "failed to find GPIO controller\n");
>> +               return -ENODEV;
>> +       }
>
> Do you still need that block of code? match is never used in this function.
>
Will get rid of it. Pretty much a redundant check.

> ... well, I think you get the drill. Let's first start by factorizing
> as much code as can be to make this driver easier to read (I have a
> few leads, but I am sure there are other similar factorizations that
> can be made). Let's also get rid of this static gpio_base_index
> variable that effectively prevents any other GPIO driver from being
> used alongside with this one. If you really need to use global GPIO
> numbers, let's see if Linus agrees for that "linux,gpio-base" DT
> property that would certainly make many people happy.
>
Will make the change. Thanks for the review. Very helpful!

We do need to use global GPIO numbers, at least before sysfs GPIO 
interface is updated to use gpiod. I'm fine with using 
"linux,gpio-base". Btw, I assume that's per GPIO controller based device 
tree property, correct?

[PATCH v4 2/5] gpio: Cygnus: add GPIO driver

[Ray Jui]

On 12/10/2014 2:34 AM, Alexandre Courbot wrote:
> On Tue, Dec 9, 2014 at 5:41 AM, Ray Jui <rjui@broadcom.com> wrote:
>> This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
>> SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller, 2) the
>> chipCommonG GPIO controller, and 3) the ALWAYS-ON GPIO controller
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>> ---
>>   drivers/gpio/Kconfig           |   11 +
>>   drivers/gpio/Makefile          |    1 +
>>   drivers/gpio/gpio-bcm-cygnus.c |  705 ++++++++++++++++++++++++++++++++++++++++
>>   3 files changed, 717 insertions(+)
>>   create mode 100644 drivers/gpio/gpio-bcm-cygnus.c
>>
>> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
>> index 633ec21..3e3b0342 100644
>> --- a/drivers/gpio/Kconfig
>> +++ b/drivers/gpio/Kconfig
>> @@ -126,6 +126,17 @@ config GPIO_74XX_MMIO
>>              8 bits:     74244 (Input), 74273 (Output)
>>              16 bits:    741624 (Input), 7416374 (Output)
>>
>> +config GPIO_BCM_CYGNUS
>> +       bool "Broadcom Cygnus GPIO support"
>> +       depends on ARCH_BCM_CYGNUS && OF_GPIO
>> +       help
>> +         Say yes here to turn on GPIO support for Broadcom Cygnus SoC
>> +
>> +         The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
>> +         GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
>> +         the always-ON GPIO controller (CRMU). All 3 GPIO controllers are
>> +         supported by this driver
>> +
>>   config GPIO_CLPS711X
>>          tristate "CLPS711X GPIO support"
>>          depends on ARCH_CLPS711X || COMPILE_TEST
>> diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
>> index 81755f1..31eb7e0 100644
>> --- a/drivers/gpio/Makefile
>> +++ b/drivers/gpio/Makefile
>> @@ -19,6 +19,7 @@ obj-$(CONFIG_GPIO_ADP5520)    += gpio-adp5520.o
>>   obj-$(CONFIG_GPIO_ADP5588)     += gpio-adp5588.o
>>   obj-$(CONFIG_GPIO_AMD8111)     += gpio-amd8111.o
>>   obj-$(CONFIG_GPIO_ARIZONA)     += gpio-arizona.o
>> +obj-$(CONFIG_GPIO_BCM_CYGNUS)  += gpio-bcm-cygnus.o
>>   obj-$(CONFIG_GPIO_BCM_KONA)    += gpio-bcm-kona.o
>>   obj-$(CONFIG_GPIO_BT8XX)       += gpio-bt8xx.o
>>   obj-$(CONFIG_GPIO_CLPS711X)    += gpio-clps711x.o
>> diff --git a/drivers/gpio/gpio-bcm-cygnus.c b/drivers/gpio/gpio-bcm-cygnus.c
>> new file mode 100644
>> index 0000000..4fd9b73
>> --- /dev/null
>> +++ b/drivers/gpio/gpio-bcm-cygnus.c
>> @@ -0,0 +1,705 @@
>> +/*
>> + * Copyright (C) 2014 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/slab.h>
>> +#include <linux/module.h>
>> +#include <linux/irq.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/io.h>
>> +#include <linux/gpio.h>
>> +#include <linux/ioport.h>
>> +#include <linux/of_device.h>
>> +#include <linux/of_irq.h>
>> +#include <linux/irqchip/chained_irq.h>
>> +
>> +#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
>> +#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
>> +#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
>> +#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
>> +#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
>> +#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
>> +#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
>> +#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
>> +#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
>> +#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
>> +#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
>> +#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
>> +
>> +/* drive strength control for ASIU GPIO */
>> +#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
>> +
>> +/* drive strength control for CCM GPIO */
>> +#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00
>> +
>> +#define GPIO_BANK_SIZE 0x200
>> +#define NGPIOS_PER_BANK 32
>> +#define GPIO_BIT(pin) ((pin) % NGPIOS_PER_BANK)
>> +#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
>> +
>> +#define GPIO_FLAG_BIT_MASK           0xffff
>> +#define GPIO_PULL_BIT_SHIFT          16
>> +#define GPIO_PULL_BIT_MASK           0x3
>> +
>> +#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
>> +#define GPIO_DRV_STRENGTH_BITS       3
>> +#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
>> +
>> +/*
>> + * For GPIO internal pull up/down registers
>> + */
>> +enum gpio_pull {
>> +       GPIO_PULL_NONE = 0,
>> +       GPIO_PULL_UP,
>> +       GPIO_PULL_DOWN,
>> +       GPIO_PULL_INVALID,
>> +};
>> +
>> +/*
>> + * GPIO drive strength
>> + */
>> +enum gpio_drv_strength {
>> +       GPIO_DRV_STRENGTH_2MA = 0,
>> +       GPIO_DRV_STRENGTH_4MA,
>> +       GPIO_DRV_STRENGTH_6MA,
>> +       GPIO_DRV_STRENGTH_8MA,
>> +       GPIO_DRV_STRENGTH_10MA,
>> +       GPIO_DRV_STRENGTH_12MA,
>> +       GPIO_DRV_STRENGTH_14MA,
>> +       GPIO_DRV_STRENGTH_16MA,
>> +       GPIO_DRV_STRENGTH_INVALID,
>> +};
>> +
>> +struct bcm_cygnus_gpio {
>> +       struct device *dev;
>> +       void __iomem *base;
>> +       void __iomem *io_ctrl;
>> +       spinlock_t lock;
>> +       struct gpio_chip gc;
>> +       unsigned num_banks;
>> +       int irq;
>> +       struct irq_domain *irq_domain;
>> +};
>> +
>> +static unsigned int gpio_base_index;
>
> Nope. What happens if there are other GPIO controllers with
> conflicting base GPIOs? I guess this adds more weight to that
> "linux,gpio-base" property I mentioned in
> http://www.spinics.net/lists/arm-kernel/msg384847.html .
>
> The best solution would be for users of the GPIOs provided by this
> driver to not rely on GPIO numbers at all, and exclusively use the
> gpiod interface. Is that an option for you?
>
Doesn't sysfs still rely the global GPIO number? We need to support the 
sysfs GPIO entries because some of our customers are using that for GPIO 
configuration.

I can definitely change the code to use device tree property 
"linux,gpio-base" though.

>> +
>> +static struct bcm_cygnus_gpio *to_bcm_cygnus_gpio(struct gpio_chip *gc)
>> +{
>> +       return container_of(gc, struct bcm_cygnus_gpio, gc);
>> +}
>> +
>> +static int bcm_cygnus_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
>> +{
>> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
>> +
>> +       return irq_find_mapping(cygnus_gpio->irq_domain, offset);
>> +}
>> +
>> +static unsigned int __gpio_reg_offset(struct bcm_cygnus_gpio *cygnus_gpio,
>> +               unsigned gpio)
>> +{
>> +       return GPIO_BANK(gpio) * GPIO_BANK_SIZE;
>> +}
>
> The cygnus_gpio argument in this function is unused. The compiler is
> supposed to signal such issues. Have you looked at your compiler
> output?
>
Let me change it to marco GPIO_REG(gpio) as you suggested.

>> +
>> +static unsigned int __gpio_bitpos(struct bcm_cygnus_gpio *cygnus_gpio,
>> +               unsigned gpio)
>> +{
>> +       return GPIO_BIT(gpio);
>> +}
>
> Same here. Also they are so simple that macros would be more adequate
> here I believe:
>
Agreed.

> #define CYGNUS_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + reg)
> #define CYGNUS_GPIO_SHIFT(pin) (pin % NGPIOS_PER_BANK) /* and remove
> the GPIO_BIT macro */
>
Right. The two macros make it simpler. Especially CYGNUS_GPIO_REG that 
takes the register offset as well. Will make the change.

>> +
>> +static void bcm_cygnus_gpio_irq_handler(unsigned int irq,
>> +               struct irq_desc *desc)
>> +{
>> +       struct bcm_cygnus_gpio *cygnus_gpio;
>> +       struct irq_chip *chip = irq_desc_get_chip(desc);
>> +       int i, bit;
>> +
>> +       chained_irq_enter(chip, desc);
>> +
>> +       cygnus_gpio = irq_get_handler_data(irq);
>> +
>> +       /* go through the entire GPIO banks and handle all interrupts */
>> +       for (i = 0; i < cygnus_gpio->num_banks; i++) {
>> +               unsigned long val = readl(cygnus_gpio->base +
>> +                               (i * GPIO_BANK_SIZE) +
>> +                               CYGNUS_GPIO_INT_MSTAT_OFFSET);
>
> Can you add cygnus_readl() and cygnus_writel() functions to avoid
> explicitly doing this operation on cygnus_gpio->base every time? It
> would be clearer and less error-prone.
>
Hmmm...But 'base' isn't the only register block that we access in this 
driver. There's also 'io_ctrl'.

What I can do is to introduce cygnus_readl() and cygnus_writel() like 
you suggested, and in the particular function 
bcm_cygnus_gpio_set_strength where io_ctrl register is needed, still use 
the normal readl and writel functions.

>> +
>> +               for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
>> +                       unsigned pin = NGPIOS_PER_BANK * i + bit;
>> +                       int child_irq =
>> +                               bcm_cygnus_gpio_to_irq(&cygnus_gpio->gc, pin);
>> +
>> +                       /*
>> +                        * Clear the interrupt before invoking the
>> +                        * handler, so we do not leave any window
>> +                        */
>> +                       writel(1 << bit,
>> +                               cygnus_gpio->base + (i * GPIO_BANK_SIZE) +
>> +                               CYGNUS_GPIO_INT_CLR_OFFSET);
>> +
>> +                       generic_handle_irq(child_irq);
>> +               }
>> +       }
>> +
>> +       chained_irq_exit(chip, desc);
>> +}
>> +
>> +static void bcm_cygnus_gpio_irq_ack(struct irq_data *d)
>> +{
>> +       struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
>> +       unsigned gpio = d->hwirq;
>> +       unsigned int offset, shift;
>> +       u32 val;
>> +
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_INT_CLR_OFFSET;
>> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
>> +
>> +       val = 1 << shift;
>
> val = BIT(shift);
>
Will change.

>> +       writel(val, cygnus_gpio->base + offset);
>> +
>> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
>> +                       offset, shift);
>> +}
>> +
>> +static void bcm_cygnus_gpio_irq_mask(struct irq_data *d)
>> +{
>> +       struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
>> +       unsigned gpio = d->hwirq;
>> +       unsigned int offset, shift;
>> +       u32 val;
>> +       unsigned long flags;
>> +
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_INT_MSK_OFFSET;
>> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
>> +
>> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
>> +
>> +       val = readl(cygnus_gpio->base + offset);
>> +       val &= ~(1 << shift);
>
> val &= ~BIT(shift);
>
Yes.

>> +       writel(val, cygnus_gpio->base + offset);
>> +
>> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
>> +
>> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
>> +                       offset, shift);
>> +}
>> +
>> +static void bcm_cygnus_gpio_irq_unmask(struct irq_data *d)
>> +{
>> +       struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
>> +       unsigned gpio = d->hwirq;
>> +       unsigned int offset, shift;
>> +       u32 val;
>> +       unsigned long flags;
>> +
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_INT_MSK_OFFSET;
>> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
>> +
>> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
>> +
>> +       val = readl(cygnus_gpio->base + offset);
>> +       val |= 1 << shift;
>
> val |= BIT(shift);
>
> Same remark everywhere it applies in this file.
>
Got it. Will go through the entire driver again and use 'BIT' where it 
applies.

>> +       writel(val, cygnus_gpio->base + offset);
>> +
>> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
>> +
>> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
>> +                       offset, shift);
>> +}
>
> It seems like you can factorize bcm_cygnus_gpio_irq_mask() and
> bcm_cygnus_gpio_irq_unmask() into one function which prototype would
> be, say:
>
> static void bcm_cygnus_gpio_irq_set_mask(struct irq_data *d, int mask);
>
> which would set of clear the bit according to the value of mask. Then
> your two mask/unmask functions would just need to call this one,
> reducing the amount of redundant code.
>
> Also I noticed that this driver has lots of readl()/twiddle
> bit/writel() sequences. Maybe it would make sense to have a
> cygnus_set_bit(chip, reg, gpio, set) function to factorize this:
>
> void cygnus_set_bit(chip, reg, gpio, set)
> {
>      unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
>      unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
>      u32 val;
>
>      val = cygnus_readl(chip, offset);
>      if (set)
>          val |= BIT(shift);
>      else
>          val &= ~BIT(shift);
>      cygnus_writel(chip, offset, val);
> }
>
Okay. Need to go through the entire driver and make the change.

>> +
>> +static int bcm_cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
>> +{
>> +       struct bcm_cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
>> +       unsigned gpio = d->hwirq;
>> +       unsigned int int_type, dual_edge, edge_lvl;
>> +       unsigned int offset, shift;
>> +       u32 val;
>> +       unsigned long flags;
>> +
>> +       switch (type & IRQ_TYPE_SENSE_MASK) {
>> +       case IRQ_TYPE_EDGE_RISING:
>> +               int_type = 0;
>> +               dual_edge = 0;
>> +               edge_lvl = 1;
>> +               break;
>> +
>> +       case IRQ_TYPE_EDGE_FALLING:
>> +               int_type = 0;
>> +               dual_edge = 0;
>> +               edge_lvl = 0;
>> +               break;
>> +
>> +       case IRQ_TYPE_EDGE_BOTH:
>> +               int_type = 0;
>> +               dual_edge = 1;
>> +               edge_lvl = 0;
>> +               break;
>> +
>> +       case IRQ_TYPE_LEVEL_HIGH:
>> +               int_type = 1;
>> +               dual_edge = 0;
>> +               edge_lvl = 1;
>> +               break;
>> +
>> +       case IRQ_TYPE_LEVEL_LOW:
>> +               int_type = 1;
>> +               dual_edge = 0;
>> +               edge_lvl = 0;
>> +               break;
>> +
>> +       default:
>> +               dev_err(cygnus_gpio->dev, "invalid GPIO irq type 0x%x\n", type);
>> +               return -EINVAL;
>> +       }
>> +
>> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
>> +
>> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_IN_TYPE_OFFSET;
>> +       val = readl(cygnus_gpio->base + offset);
>> +       val &= ~(1 << shift);
>> +       val |= int_type << shift;
>> +       writel(val, cygnus_gpio->base + offset);
>> +
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_INT_DE_OFFSET;
>> +       val = readl(cygnus_gpio->base + offset);
>> +       val &= ~(1 << shift);
>> +       val |= dual_edge << shift;
>> +       writel(val, cygnus_gpio->base + offset);
>> +
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_INT_EDGE_OFFSET;
>> +       val = readl(cygnus_gpio->base + offset);
>> +       val &= ~(1 << shift);
>> +       val |= edge_lvl << shift;
>> +       writel(val, cygnus_gpio->base + offset);
>
> With the functions/macros suggested above I think you could change the
> 3 blocks above into something like:
>
> cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_IN_TYPE_OFFSET, gpio, int_type);
> cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_INT_DE_OFFSET, gpio, dual_edge);
> cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_INT_EDGE_OFFSET, gpio, edge_lvl);
>
Yes. Indeed a lot simpler and easier to read. Thanks.

>> +
>> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
>> +
>> +       return 0;
>> +}
>> +
>> +static struct irq_chip bcm_cygnus_gpio_irq_chip = {
>> +       .name = "bcm-cygnus-gpio",
>> +       .irq_ack = bcm_cygnus_gpio_irq_ack,
>> +       .irq_mask = bcm_cygnus_gpio_irq_mask,
>> +       .irq_unmask = bcm_cygnus_gpio_irq_unmask,
>> +       .irq_set_type = bcm_cygnus_gpio_irq_set_type,
>> +};
>> +
>> +static int bcm_cygnus_gpio_direction_input(struct gpio_chip *gc,
>> +               unsigned gpio)
>> +{
>> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
>> +       unsigned int offset, shift;
>> +       u32 val;
>> +       unsigned long flags;
>> +
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_OUT_EN_OFFSET;
>> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
>> +
>> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
>> +
>> +       val = readl(cygnus_gpio->base + offset);
>> +       val &= ~(1 << shift);
>> +       writel(val, cygnus_gpio->base + offset);
>> +
>> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
>> +
>> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
>> +                       offset, shift);
>> +
>> +       return 0;
>> +}
>> +
>> +static int bcm_cygnus_gpio_direction_output(struct gpio_chip *gc,
>> +               unsigned gpio, int value)
>> +{
>> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
>> +       unsigned int offset, shift;
>> +       u32 val;
>> +       unsigned long flags;
>> +
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_OUT_EN_OFFSET;
>> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
>> +
>> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
>> +
>> +       val = readl(cygnus_gpio->base + offset);
>> +       val |= 1 << shift;
>> +       writel(val, cygnus_gpio->base + offset);
>> +
>> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u\n", gpio,
>> +                       offset, shift);
>> +
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_DATA_OUT_OFFSET;
>> +
>> +       val = readl(cygnus_gpio->base + offset);
>> +       if (value)
>> +               val |= 1 << shift;
>> +       else
>> +               val &= ~(1 << shift);
>> +       writel(val, cygnus_gpio->base + offset);
>
> And here you would have:
>
> cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 1);
> cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
>
> Many other sites in this file could be simplified this way.
>
Yes. Will make the change.

>> +
>> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
>> +
>> +       dev_dbg(cygnus_gpio->dev,
>> +               "gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
>> +               gpio, offset, shift, val);
>> +
>> +       return 0;
>> +}
>> +
>> +static void bcm_cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio,
>> +               int value)
>> +{
>> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
>> +       unsigned int offset, shift;
>> +       u32 val;
>> +       unsigned long flags;
>> +
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_DATA_OUT_OFFSET;
>> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
>> +
>> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
>> +
>> +       val = readl(cygnus_gpio->base + offset);
>> +       if (value)
>> +               val |= 1 << shift;
>> +       else
>> +               val &= ~(1 << shift);
>> +       writel(val, cygnus_gpio->base + offset);
>> +
>> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
>> +
>> +       dev_dbg(cygnus_gpio->dev,
>> +               "gpio:%u offset:0x%04x shift:%u val:0x%08x\n",
>> +               gpio, offset, shift, val);
>> +}
>> +
>> +static int bcm_cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
>> +{
>> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
>> +       unsigned int offset, shift;
>> +       u32 val;
>> +
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_DATA_IN_OFFSET;
>> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
>> +
>> +       val = readl(cygnus_gpio->base + offset);
>> +       val = (val >> shift) & 1;
>> +
>> +       dev_dbg(cygnus_gpio->dev, "gpio:%u offset:0x%04x shift:%u val:%u\n",
>> +                       gpio, offset, shift, val);
>> +
>> +       return val;
>> +}
>> +
>> +static struct lock_class_key gpio_lock_class;
>> +
>> +static int bcm_cygnus_gpio_irq_map(struct irq_domain *d, unsigned int irq,
>> +                                irq_hw_number_t hwirq)
>> +{
>> +       int ret;
>> +
>> +       ret = irq_set_chip_data(irq, d->host_data);
>> +       if (ret < 0)
>> +               return ret;
>> +       irq_set_lockdep_class(irq, &gpio_lock_class);
>> +       irq_set_chip_and_handler(irq, &bcm_cygnus_gpio_irq_chip,
>> +                       handle_simple_irq);
>> +       set_irq_flags(irq, IRQF_VALID);
>> +
>> +       return 0;
>> +}
>> +
>> +static void bcm_cygnus_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
>> +{
>> +       irq_set_chip_and_handler(irq, NULL, NULL);
>> +       irq_set_chip_data(irq, NULL);
>> +}
>> +
>> +static struct irq_domain_ops bcm_cygnus_irq_ops = {
>> +       .map = bcm_cygnus_gpio_irq_map,
>> +       .unmap = bcm_cygnus_gpio_irq_unmap,
>> +       .xlate = irq_domain_xlate_twocell,
>> +};
>> +
>> +#ifdef CONFIG_OF_GPIO
>> +static void bcm_cygnus_gpio_set_pull(struct bcm_cygnus_gpio *cygnus_gpio,
>> +               unsigned gpio, enum gpio_pull pull)
>> +{
>> +       unsigned int offset, shift;
>> +       u32 val, pullup;
>> +       unsigned long flags;
>> +
>> +       switch (pull) {
>> +       case GPIO_PULL_UP:
>> +               pullup = 1;
>> +               break;
>> +       case GPIO_PULL_DOWN:
>> +               pullup = 0;
>> +               break;
>> +       case GPIO_PULL_NONE:
>> +       case GPIO_PULL_INVALID:
>> +       default:
>> +               return;
>> +       }
>> +
>> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
>> +
>> +       /* set pull up/down */
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_PAD_RES_OFFSET;
>> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
>> +
>> +       val = readl(cygnus_gpio->base + offset);
>> +       val &= ~(1 << shift);
>> +       if (pullup)
>> +               val |= 1 << shift;
>> +       writel(val, cygnus_gpio->base + offset);
>> +
>> +       /* enable pad */
>> +       offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +               CYGNUS_GPIO_RES_EN_OFFSET;
>> +       val = readl(cygnus_gpio->base + offset);
>> +       val |= 1 << shift;
>> +       writel(val, cygnus_gpio->base + offset);
>> +
>> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
>> +}
>> +
>> +static void bcm_cygnus_gpio_set_strength(struct bcm_cygnus_gpio *cygnus_gpio,
>> +               unsigned gpio, enum gpio_drv_strength strength)
>> +{
>> +       struct device *dev = cygnus_gpio->dev;
>> +       void __iomem *base;
>> +       unsigned int i, offset, shift;
>> +       u32 val;
>> +       unsigned long flags;
>> +
>> +       /* some GPIO controllers do not support drive strength configuration */
>> +       if (of_find_property(dev->of_node, "no-drv-strength", NULL))
>> +               return;
>> +
>> +       if (cygnus_gpio->io_ctrl) {
>> +               base = cygnus_gpio->io_ctrl;
>> +               offset = CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET;
>> +       } else {
>> +               base = cygnus_gpio->base;
>> +               offset = __gpio_reg_offset(cygnus_gpio, gpio) +
>> +                       CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET;
>> +       }
>> +
>> +       shift = __gpio_bitpos(cygnus_gpio, gpio);
>> +
>> +       spin_lock_irqsave(&cygnus_gpio->lock, flags);
>> +
>> +       for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
>> +               val = readl(base + offset);
>> +               val &= ~(1 << shift);
>> +               val |= ((strength >> i) & 0x1) << shift;
>> +               writel(val, base + offset);
>> +               offset += 4;
>> +       }
>> +
>> +       spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
>> +}
>> +
>> +static int bcm_cygnus_gpio_of_xlate(struct gpio_chip *gc,
>> +               const struct of_phandle_args *gpiospec, u32 *flags)
>> +{
>> +       struct bcm_cygnus_gpio *cygnus_gpio = to_bcm_cygnus_gpio(gc);
>> +       enum gpio_pull pull;
>> +       enum gpio_drv_strength strength;
>> +
>> +       if (gc->of_gpio_n_cells < 2)
>> +               return -EINVAL;
>> +
>> +       if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
>> +               return -EINVAL;
>> +
>> +       if (gpiospec->args[0] >= gc->ngpio)
>> +               return -EINVAL;
>> +
>> +       pull = (gpiospec->args[1] >> GPIO_PULL_BIT_SHIFT) & GPIO_PULL_BIT_MASK;
>> +       if (WARN_ON(pull >= GPIO_PULL_INVALID))
>> +               return -EINVAL;
>> +
>> +       strength = (gpiospec->args[1] >> GPIO_DRV_STRENGTH_BIT_SHIFT) &
>> +               GPIO_DRV_STRENGTH_BIT_MASK;
>> +
>> +       if (flags)
>> +               *flags = gpiospec->args[1] & GPIO_FLAG_BIT_MASK;
>> +
>> +       bcm_cygnus_gpio_set_pull(cygnus_gpio, gpiospec->args[0], pull);
>> +       bcm_cygnus_gpio_set_strength(cygnus_gpio, gpiospec->args[0], strength);
>> +
>> +       return gpiospec->args[0];
>> +}
>> +#endif
>> +
>> +static const struct of_device_id bcm_cygnus_gpio_of_match[] = {
>> +       { .compatible = "brcm,cygnus-gpio" },
>> +       { }
>> +};
>> +MODULE_DEVICE_TABLE(of, bcm_cygnus_gpio_of_match);
>> +
>> +static int bcm_cygnus_gpio_probe(struct platform_device *pdev)
>> +{
>> +       struct device *dev = &pdev->dev;
>> +       const struct of_device_id *match;
>> +       struct resource *res;
>> +       struct bcm_cygnus_gpio *cygnus_gpio;
>> +       struct gpio_chip *gc;
>> +       u32 i, ngpios;
>> +       int ret;
>> +
>> +       match = of_match_device(bcm_cygnus_gpio_of_match, dev);
>> +       if (!match) {
>> +               dev_err(&pdev->dev, "failed to find GPIO controller\n");
>> +               return -ENODEV;
>> +       }
>
> Do you still need that block of code? match is never used in this function.
>
Will get rid of it. Pretty much a redundant check.

> ... well, I think you get the drill. Let's first start by factorizing
> as much code as can be to make this driver easier to read (I have a
> few leads, but I am sure there are other similar factorizations that
> can be made). Let's also get rid of this static gpio_base_index
> variable that effectively prevents any other GPIO driver from being
> used alongside with this one. If you really need to use global GPIO
> numbers, let's see if Linus agrees for that "linux,gpio-base" DT
> property that would certainly make many people happy.
>
Will make the change. Thanks for the review. Very helpful!

We do need to use global GPIO numbers, at least before sysfs GPIO 
interface is updated to use gpiod. I'm fine with using 
"linux,gpio-base". Btw, I assume that's per GPIO controller based device 
tree property, correct?

Re: [PATCH 1/4] pci: iProc: define Broadcom iProc PCIe binding

[Ray Jui]

On 12/10/2014 2:30 AM, Lucas Stach wrote:
>> +Example:
>> +
>> +SoC specific DT Entry:
>> +
>> +	pcie0: pcie@18012000 {
>> +		compatible = "brcm,iproc-pcie";
>> +		reg = <0x18012000 0x1000>,
>> +			<0x18002000 0x1000>;
>> +		interrupts = <GIC_SPI 96 IRQ_TYPE_NONE>,
>> +			     <GIC_SPI 97 IRQ_TYPE_NONE>,
>> +			     <GIC_SPI 98 IRQ_TYPE_NONE>,
>> +			     <GIC_SPI 99 IRQ_TYPE_NONE>,
>> +			     <GIC_SPI 100 IRQ_TYPE_NONE>,
>> +			     <GIC_SPI 101 IRQ_TYPE_NONE>;
>
> This is missing the interrupt-map and interrupt-map-mask for the legacy
> INTx interrupts. If you add this you don't need to have a special map
> function in your driver, but can just use the standard
> of_irq_parse_and_map_pci() function.
>
> Regards,
> Lucas
>
Thanks for pointing this out. I will look into this and try it out.

Re: [PATCH 1/4] pci: iProc: define Broadcom iProc PCIe binding

[Ray Jui]

On 12/10/2014 2:30 AM, Lucas Stach wrote:
>> +Example:
>> +
>> +SoC specific DT Entry:
>> +
>> +	pcie0: pcie@18012000 {
>> +		compatible = "brcm,iproc-pcie";
>> +		reg = <0x18012000 0x1000>,
>> +			<0x18002000 0x1000>;
>> +		interrupts = <GIC_SPI 96 IRQ_TYPE_NONE>,
>> +			     <GIC_SPI 97 IRQ_TYPE_NONE>,
>> +			     <GIC_SPI 98 IRQ_TYPE_NONE>,
>> +			     <GIC_SPI 99 IRQ_TYPE_NONE>,
>> +			     <GIC_SPI 100 IRQ_TYPE_NONE>,
>> +			     <GIC_SPI 101 IRQ_TYPE_NONE>;
>
> This is missing the interrupt-map and interrupt-map-mask for the legacy
> INTx interrupts. If you add this you don't need to have a special map
> function in your driver, but can just use the standard
> of_irq_parse_and_map_pci() function.
>
> Regards,
> Lucas
>
Thanks for pointing this out. I will look into this and try it out.
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[PATCH 1/4] pci: iProc: define Broadcom iProc PCIe binding

[Ray Jui]

On 12/10/2014 2:30 AM, Lucas Stach wrote:
>> +Example:
>> +
>> +SoC specific DT Entry:
>> +
>> +	pcie0: pcie at 18012000 {
>> +		compatible = "brcm,iproc-pcie";
>> +		reg = <0x18012000 0x1000>,
>> +			<0x18002000 0x1000>;
>> +		interrupts = <GIC_SPI 96 IRQ_TYPE_NONE>,
>> +			     <GIC_SPI 97 IRQ_TYPE_NONE>,
>> +			     <GIC_SPI 98 IRQ_TYPE_NONE>,
>> +			     <GIC_SPI 99 IRQ_TYPE_NONE>,
>> +			     <GIC_SPI 100 IRQ_TYPE_NONE>,
>> +			     <GIC_SPI 101 IRQ_TYPE_NONE>;
>
> This is missing the interrupt-map and interrupt-map-mask for the legacy
> INTx interrupts. If you add this you don't need to have a special map
> function in your driver, but can just use the standard
> of_irq_parse_and_map_pci() function.
>
> Regards,
> Lucas
>
Thanks for pointing this out. I will look into this and try it out.

Re: [PATCH 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Arend van Spriel]

+ Rafal

On 12/10/14 19:46, Florian Fainelli wrote:
> 2014-12-10 8:46 GMT-08:00 Scott Branden<sbranden@broadcom.com>:
>> On 14-12-10 03:31 AM, Arnd Bergmann wrote:
>>>
>>> On Tuesday 09 December 2014 16:04:29 Ray Jui wrote:
>>>>
>>>> Add initial version of the Broadcom iProc PCIe driver. This driver
>>>> has been tested on NSP and Cygnus and is expected to work on all iProc
>>>> family of SoCs that deploys the same PCIe host controller
>>>>
>>>> The driver also supports MSI
>>>>
>>>> Signed-off-by: Ray Jui<rjui@broadcom.com>
>>>> Reviewed-by: Scott Branden<sbranden@broadcom.com>
>>>
>>>
>>> The driver looks suspiciously like the one that Hauke already submitted a
>>> while ago for bcm53xx. Please come up with a merged driver that works for
>>> both.
>>
>> Could you please be a little more specific.  What driver did "Hauke already
>> submitted"?  I do not see any driver in the kernel you are talking about.
>
> https://www.marc.info/?l=linux-pci&m=141547043110684&w=2
>
>>>
>>>
>>> Are you sure that iProc isn't based on the BCMA bus infrastructure after
>>> all? Even the physical address of your PCI host falls into the address
>>> range that is used for the internal BCMA bus on the other chips!
>>
>> BCMA seems to be for MIPS architectures.  It seems to be quite specific to
>> those architectures using BCMA.  I see no use of it in bcm53xx code?
>
> BCMA lives in its own directory in drivers/bcma/ and is not specific
> to MIPS actually. Older BCM47xx/BCM53xx MIPS-based SoCs traditionally
> started with a discoverable Silicon Sonics Backplane (drivers/ssb) and
> progressively migrated to BCMA (drivers/bcma), both subsystems offer a
> very similar bus/device/driver abstraction and discovery mechanism.

BCMA core is the bus driver for discoverable ARM AXI interconnect. Apart 
from that it also provides drivers for some cores. For the chips to be 
discoverable it needs additional IP logic. If that is not used in the 
iProc family devices, it can not use the BCMA-based PCIe controller 
driver that Hauke submitted unless BCMA would provide an API to provide 
the chips' core information statically either per core or a full list.

Regards,
Arend

[PATCH 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Arend van Spriel]

+ Rafal

On 12/10/14 19:46, Florian Fainelli wrote:
> 2014-12-10 8:46 GMT-08:00 Scott Branden<sbranden@broadcom.com>:
>> On 14-12-10 03:31 AM, Arnd Bergmann wrote:
>>>
>>> On Tuesday 09 December 2014 16:04:29 Ray Jui wrote:
>>>>
>>>> Add initial version of the Broadcom iProc PCIe driver. This driver
>>>> has been tested on NSP and Cygnus and is expected to work on all iProc
>>>> family of SoCs that deploys the same PCIe host controller
>>>>
>>>> The driver also supports MSI
>>>>
>>>> Signed-off-by: Ray Jui<rjui@broadcom.com>
>>>> Reviewed-by: Scott Branden<sbranden@broadcom.com>
>>>
>>>
>>> The driver looks suspiciously like the one that Hauke already submitted a
>>> while ago for bcm53xx. Please come up with a merged driver that works for
>>> both.
>>
>> Could you please be a little more specific.  What driver did "Hauke already
>> submitted"?  I do not see any driver in the kernel you are talking about.
>
> https://www.marc.info/?l=linux-pci&m=141547043110684&w=2
>
>>>
>>>
>>> Are you sure that iProc isn't based on the BCMA bus infrastructure after
>>> all? Even the physical address of your PCI host falls into the address
>>> range that is used for the internal BCMA bus on the other chips!
>>
>> BCMA seems to be for MIPS architectures.  It seems to be quite specific to
>> those architectures using BCMA.  I see no use of it in bcm53xx code?
>
> BCMA lives in its own directory in drivers/bcma/ and is not specific
> to MIPS actually. Older BCM47xx/BCM53xx MIPS-based SoCs traditionally
> started with a discoverable Silicon Sonics Backplane (drivers/ssb) and
> progressively migrated to BCMA (drivers/bcma), both subsystems offer a
> very similar bus/device/driver abstraction and discovery mechanism.

BCMA core is the bus driver for discoverable ARM AXI interconnect. Apart 
from that it also provides drivers for some cores. For the chips to be 
discoverable it needs additional IP logic. If that is not used in the 
iProc family devices, it can not use the BCMA-based PCIe controller 
driver that Hauke submitted unless BCMA would provide an API to provide 
the chips' core information statically either per core or a full list.

Regards,
Arend

[PATCH v5 0/3] Add gpio support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial GPIO support for the Broadcom Cygnus SoC.
Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
the same Cygnus GPIO driver

Changes from v4:
 - Use DT property "linux,gpio-base" to define GPIO base number
 - factorize common code to improve code readability and reduce code size
 - remove "bcm_" prefix on function and struct names
 - improve debugging prints
 - default GPIO_BCM_CYGNUS to y in Kconfig (it still depends on
   ARCH_BCM_CYGNUS). This way we do not need to select it from the
   arch/arm/mach-bcm/Kconfig
 - Get rid of redundant MAINTAINER entry for this driver. It will be maintained
   by Broadcom iProc/Cygnus maintainers
 - Update device tree document based on driver changes

Changes from v3:
 - Fix dt property tpyo
 - Fix incorrect GPIO compatible ID in device tree binding document example

Changes from v2:
 - Consolidate different compatible IDs into "brcm,cygnus-gpio"
 - Get rid of redundant "no-interrupt" property

Changes from v1:
 - Get rid of inline qualifier
 - Get rid of redundant check in the ISR
 - Other minor fixes to imrove code readability

Ray Jui (3):
  gpio: Cygnus: define Broadcom Cygnus GPIO binding
  gpio: Cygnus: add GPIO driver
  ARM: dts: enable GPIO for Broadcom Cygnus

 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   87 +++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   33 ++
 drivers/gpio/Kconfig                               |   12 +
 drivers/gpio/Makefile                              |    1 +
 drivers/gpio/gpio-bcm-cygnus.c                     |  613 ++++++++++++++++++++
 5 files changed, 746 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

-- 
1.7.9.5

[PATCH v5 0/3] Add gpio support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial GPIO support for the Broadcom Cygnus SoC.
Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
the same Cygnus GPIO driver

Changes from v4:
 - Use DT property "linux,gpio-base" to define GPIO base number
 - factorize common code to improve code readability and reduce code size
 - remove "bcm_" prefix on function and struct names
 - improve debugging prints
 - default GPIO_BCM_CYGNUS to y in Kconfig (it still depends on
   ARCH_BCM_CYGNUS). This way we do not need to select it from the
   arch/arm/mach-bcm/Kconfig
 - Get rid of redundant MAINTAINER entry for this driver. It will be maintained
   by Broadcom iProc/Cygnus maintainers
 - Update device tree document based on driver changes

Changes from v3:
 - Fix dt property tpyo
 - Fix incorrect GPIO compatible ID in device tree binding document example

Changes from v2:
 - Consolidate different compatible IDs into "brcm,cygnus-gpio"
 - Get rid of redundant "no-interrupt" property

Changes from v1:
 - Get rid of inline qualifier
 - Get rid of redundant check in the ISR
 - Other minor fixes to imrove code readability

Ray Jui (3):
  gpio: Cygnus: define Broadcom Cygnus GPIO binding
  gpio: Cygnus: add GPIO driver
  ARM: dts: enable GPIO for Broadcom Cygnus

 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   87 +++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   33 ++
 drivers/gpio/Kconfig                               |   12 +
 drivers/gpio/Makefile                              |    1 +
 drivers/gpio/gpio-bcm-cygnus.c                     |  613 ++++++++++++++++++++
 5 files changed, 746 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

-- 
1.7.9.5

[PATCH v5 0/3] Add gpio support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial GPIO support for the Broadcom Cygnus SoC.
Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
the same Cygnus GPIO driver

Changes from v4:
 - Use DT property "linux,gpio-base" to define GPIO base number
 - factorize common code to improve code readability and reduce code size
 - remove "bcm_" prefix on function and struct names
 - improve debugging prints
 - default GPIO_BCM_CYGNUS to y in Kconfig (it still depends on
   ARCH_BCM_CYGNUS). This way we do not need to select it from the
   arch/arm/mach-bcm/Kconfig
 - Get rid of redundant MAINTAINER entry for this driver. It will be maintained
   by Broadcom iProc/Cygnus maintainers
 - Update device tree document based on driver changes

Changes from v3:
 - Fix dt property tpyo
 - Fix incorrect GPIO compatible ID in device tree binding document example

Changes from v2:
 - Consolidate different compatible IDs into "brcm,cygnus-gpio"
 - Get rid of redundant "no-interrupt" property

Changes from v1:
 - Get rid of inline qualifier
 - Get rid of redundant check in the ISR
 - Other minor fixes to imrove code readability

Ray Jui (3):
  gpio: Cygnus: define Broadcom Cygnus GPIO binding
  gpio: Cygnus: add GPIO driver
  ARM: dts: enable GPIO for Broadcom Cygnus

 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   87 +++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   33 ++
 drivers/gpio/Kconfig                               |   12 +
 drivers/gpio/Makefile                              |    1 +
 drivers/gpio/gpio-bcm-cygnus.c                     |  613 ++++++++++++++++++++
 5 files changed, 746 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

-- 
1.7.9.5

[PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

Document the GPIO device tree binding for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   87 ++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt

diff --git a/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
new file mode 100644
index 0000000..0e446d4
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
@@ -0,0 +1,87 @@
+Broadcom Cygnus GPIO Controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,cygnus-gpio"
+
+- reg:
+    Define the base and range of the I/O address space that contain the Cygnus
+GPIO controller registers
+
+- ngpios:
+    Total number of GPIOs the controller provides
+
+- linux,gpio-base:
+    Base GPIO number of this controller
+
+- #gpio-cells:
+    Must be two. The first cell is the GPIO pin number (within the
+controller's domain) and the second cell is used for the following:
+    bit[0]: polarity (0 for normal and 1 for inverted)
+    bit[18:16]: internal pull up/down: 0 - pull up/down disabled
+                                       1 - pull up enabled
+                                       2 - pull down enabled
+    bit[22:20]: drive strength: 0 - 2 mA
+                                1 - 4 mA
+                                2 - 6 mA
+                                3 - 8 mA
+                                4 - 10 mA
+                                5 - 12 mA
+                                6 - 14 mA
+                                7 - 16 mA
+
+- gpio-controller:
+    Specifies that the node is a GPIO controller
+
+Optional properties:
+
+- interrupt-controller:
+    Specifies that the node is an interrupt controller. Not all Cygnus GPIO
+interfaces support interrupt, e.g., the CRMU GPIO controller does not have its
+interrupt routed to the main processor's GIC
+
+- interrupts:
+    The interrupt outputs from the GPIO controller.
+
+- no-drv-strength:
+    Specifies the GPIO controller does not support drive strength configuration
+
+Example:
+	gpio_asiu: gpio@180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		linux,gpio-base = <0>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio@03024800 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		linux,gpio-base = <146>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-drv-strength;
+	};
+
+	/*
+	 * Touchscreen that uses the ASIU GPIO 100, with internal pull-up
+	 * enabled
+	 */
+	tsc {
+		...
+		...
+		gpio-event = <&gpio_asiu 100 0x10000>;
+	};
+
+	/* Bluetooth that uses the CRMU GPIO 2, with polarity inverted */
+	bluetooth {
+		...
+		...
+		bcm,rfkill-bank-sel = <&gpio_crmu 2 1>
+	}
-- 
1.7.9.5

[PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

Document the GPIO device tree binding for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   87 ++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt

diff --git a/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
new file mode 100644
index 0000000..0e446d4
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
@@ -0,0 +1,87 @@
+Broadcom Cygnus GPIO Controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,cygnus-gpio"
+
+- reg:
+    Define the base and range of the I/O address space that contain the Cygnus
+GPIO controller registers
+
+- ngpios:
+    Total number of GPIOs the controller provides
+
+- linux,gpio-base:
+    Base GPIO number of this controller
+
+- #gpio-cells:
+    Must be two. The first cell is the GPIO pin number (within the
+controller's domain) and the second cell is used for the following:
+    bit[0]: polarity (0 for normal and 1 for inverted)
+    bit[18:16]: internal pull up/down: 0 - pull up/down disabled
+                                       1 - pull up enabled
+                                       2 - pull down enabled
+    bit[22:20]: drive strength: 0 - 2 mA
+                                1 - 4 mA
+                                2 - 6 mA
+                                3 - 8 mA
+                                4 - 10 mA
+                                5 - 12 mA
+                                6 - 14 mA
+                                7 - 16 mA
+
+- gpio-controller:
+    Specifies that the node is a GPIO controller
+
+Optional properties:
+
+- interrupt-controller:
+    Specifies that the node is an interrupt controller. Not all Cygnus GPIO
+interfaces support interrupt, e.g., the CRMU GPIO controller does not have its
+interrupt routed to the main processor's GIC
+
+- interrupts:
+    The interrupt outputs from the GPIO controller.
+
+- no-drv-strength:
+    Specifies the GPIO controller does not support drive strength configuration
+
+Example:
+	gpio_asiu: gpio@180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		linux,gpio-base = <0>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio@03024800 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		linux,gpio-base = <146>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-drv-strength;
+	};
+
+	/*
+	 * Touchscreen that uses the ASIU GPIO 100, with internal pull-up
+	 * enabled
+	 */
+	tsc {
+		...
+		...
+		gpio-event = <&gpio_asiu 100 0x10000>;
+	};
+
+	/* Bluetooth that uses the CRMU GPIO 2, with polarity inverted */
+	bluetooth {
+		...
+		...
+		bcm,rfkill-bank-sel = <&gpio_crmu 2 1>
+	}
-- 
1.7.9.5

[PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

Document the GPIO device tree binding for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   87 ++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt

diff --git a/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
new file mode 100644
index 0000000..0e446d4
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
@@ -0,0 +1,87 @@
+Broadcom Cygnus GPIO Controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,cygnus-gpio"
+
+- reg:
+    Define the base and range of the I/O address space that contain the Cygnus
+GPIO controller registers
+
+- ngpios:
+    Total number of GPIOs the controller provides
+
+- linux,gpio-base:
+    Base GPIO number of this controller
+
+- #gpio-cells:
+    Must be two. The first cell is the GPIO pin number (within the
+controller's domain) and the second cell is used for the following:
+    bit[0]: polarity (0 for normal and 1 for inverted)
+    bit[18:16]: internal pull up/down: 0 - pull up/down disabled
+                                       1 - pull up enabled
+                                       2 - pull down enabled
+    bit[22:20]: drive strength: 0 - 2 mA
+                                1 - 4 mA
+                                2 - 6 mA
+                                3 - 8 mA
+                                4 - 10 mA
+                                5 - 12 mA
+                                6 - 14 mA
+                                7 - 16 mA
+
+- gpio-controller:
+    Specifies that the node is a GPIO controller
+
+Optional properties:
+
+- interrupt-controller:
+    Specifies that the node is an interrupt controller. Not all Cygnus GPIO
+interfaces support interrupt, e.g., the CRMU GPIO controller does not have its
+interrupt routed to the main processor's GIC
+
+- interrupts:
+    The interrupt outputs from the GPIO controller.
+
+- no-drv-strength:
+    Specifies the GPIO controller does not support drive strength configuration
+
+Example:
+	gpio_asiu: gpio at 180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		linux,gpio-base = <0>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio at 03024800 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		linux,gpio-base = <146>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-drv-strength;
+	};
+
+	/*
+	 * Touchscreen that uses the ASIU GPIO 100, with internal pull-up
+	 * enabled
+	 */
+	tsc {
+		...
+		...
+		gpio-event = <&gpio_asiu 100 0x10000>;
+	};
+
+	/* Bluetooth that uses the CRMU GPIO 2, with polarity inverted */
+	bluetooth {
+		...
+		...
+		bcm,rfkill-bank-sel = <&gpio_crmu 2 1>
+	}
-- 
1.7.9.5

[PATCH v5 2/3] gpio: Cygnus: add GPIO driver

[Ray Jui]

This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller, 2) the
chipCommonG GPIO controller, and 3) the ALWAYS-ON GPIO controller

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/gpio/Kconfig           |   12 +
 drivers/gpio/Makefile          |    1 +
 drivers/gpio/gpio-bcm-cygnus.c |  613 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 626 insertions(+)
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 633ec21..1790ffd 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -126,6 +126,18 @@ config GPIO_74XX_MMIO
 	    8 bits:	74244 (Input), 74273 (Output)
 	    16 bits:	741624 (Input), 7416374 (Output)
 
+config GPIO_BCM_CYGNUS
+	bool "Broadcom Cygnus GPIO support"
+	depends on ARCH_BCM_CYGNUS && OF_GPIO
+	default y
+	help
+	  Say yes here to turn on GPIO support for Broadcom Cygnus SoC
+
+	  The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
+	  GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
+	  the always-ON GPIO controller (CRMU). All 3 GPIO controllers are
+	  supported by this driver
+
 config GPIO_CLPS711X
 	tristate "CLPS711X GPIO support"
 	depends on ARCH_CLPS711X || COMPILE_TEST
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 81755f1..31eb7e0 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_GPIO_ADP5520)	+= gpio-adp5520.o
 obj-$(CONFIG_GPIO_ADP5588)	+= gpio-adp5588.o
 obj-$(CONFIG_GPIO_AMD8111)	+= gpio-amd8111.o
 obj-$(CONFIG_GPIO_ARIZONA)	+= gpio-arizona.o
+obj-$(CONFIG_GPIO_BCM_CYGNUS)	+= gpio-bcm-cygnus.o
 obj-$(CONFIG_GPIO_BCM_KONA)	+= gpio-bcm-kona.o
 obj-$(CONFIG_GPIO_BT8XX)	+= gpio-bt8xx.o
 obj-$(CONFIG_GPIO_CLPS711X)	+= gpio-clps711x.o
diff --git a/drivers/gpio/gpio-bcm-cygnus.c b/drivers/gpio/gpio-bcm-cygnus.c
new file mode 100644
index 0000000..a6a7732
--- /dev/null
+++ b/drivers/gpio/gpio-bcm-cygnus.c
@@ -0,0 +1,613 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/ioport.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/irqchip/chained_irq.h>
+
+#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
+#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
+#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
+#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
+#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
+#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
+#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
+#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
+#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
+#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
+#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
+#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
+
+/* drive strength control for ASIU GPIO */
+#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
+
+/* drive strength control for CCM GPIO */
+#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00
+
+#define GPIO_BANK_SIZE 0x200
+#define NGPIOS_PER_BANK 32
+#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
+
+#define CYGNUS_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + (reg))
+#define CYGNUS_GPIO_SHIFT(pin) ((pin) % NGPIOS_PER_BANK)
+
+#define GPIO_FLAG_BIT_MASK           0xffff
+#define GPIO_PULL_BIT_SHIFT          16
+#define GPIO_PULL_BIT_MASK           0x3
+
+#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
+#define GPIO_DRV_STRENGTH_BITS       3
+#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
+
+/*
+ * For GPIO internal pull up/down registers
+ */
+enum gpio_pull {
+	GPIO_PULL_NONE = 0,
+	GPIO_PULL_UP,
+	GPIO_PULL_DOWN,
+	GPIO_PULL_INVALID,
+};
+
+/*
+ * GPIO drive strength
+ */
+enum gpio_drv_strength {
+	GPIO_DRV_STRENGTH_2MA = 0,
+	GPIO_DRV_STRENGTH_4MA,
+	GPIO_DRV_STRENGTH_6MA,
+	GPIO_DRV_STRENGTH_8MA,
+	GPIO_DRV_STRENGTH_10MA,
+	GPIO_DRV_STRENGTH_12MA,
+	GPIO_DRV_STRENGTH_14MA,
+	GPIO_DRV_STRENGTH_16MA,
+	GPIO_DRV_STRENGTH_INVALID,
+};
+
+struct cygnus_gpio {
+	struct device *dev;
+	void __iomem *base;
+	void __iomem *io_ctrl;
+	spinlock_t lock;
+	struct gpio_chip gc;
+	unsigned num_banks;
+	int irq;
+	struct irq_domain *irq_domain;
+};
+
+static struct cygnus_gpio *to_cygnus_gpio(struct gpio_chip *gc)
+{
+	return container_of(gc, struct cygnus_gpio, gc);
+}
+
+static u32 cygnus_readl(struct cygnus_gpio *cygnus_gpio, unsigned int offset)
+{
+	return readl(cygnus_gpio->base + offset);
+}
+
+static void cygnus_writel(struct cygnus_gpio *cygnus_gpio,
+			  unsigned int offset, u32 val)
+{
+	writel(val, cygnus_gpio->base + offset);
+}
+
+/**
+ *  cygnus_set_bit - set or clear one bit (corresponding to the GPIO pin) in a
+ *  Cygnus GPIO register
+ *
+ *  @cygnus_gpio: Cygnus GPIO device
+ *  @reg: register offset
+ *  @gpio: GPIO pin
+ *  @set: set or clear. 1 - set; 0 -clear
+ */
+static void cygnus_set_bit(struct cygnus_gpio *cygnus_gpio,
+			   unsigned int reg, unsigned gpio, int set)
+{
+	unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val;
+
+	val = cygnus_readl(cygnus_gpio, offset);
+	if (set)
+		val |= BIT(shift);
+	else
+		val &= ~BIT(shift);
+	cygnus_writel(cygnus_gpio, offset, val);
+}
+
+static int cygnus_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+
+	return irq_find_mapping(cygnus_gpio->irq_domain, offset);
+}
+
+static void cygnus_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+	struct cygnus_gpio *cygnus_gpio;
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	int i, bit;
+
+	chained_irq_enter(chip, desc);
+
+	cygnus_gpio = irq_get_handler_data(irq);
+
+	/* go through the entire GPIO banks and handle all interrupts */
+	for (i = 0; i < cygnus_gpio->num_banks; i++) {
+		unsigned long val = cygnus_readl(cygnus_gpio,
+				(i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_MSTAT_OFFSET);
+
+		for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
+			unsigned pin = NGPIOS_PER_BANK * i + bit;
+			int child_irq =
+				cygnus_gpio_to_irq(&cygnus_gpio->gc, pin);
+
+			/*
+			 * Clear the interrupt before invoking the
+			 * handler, so we do not leave any window
+			 */
+			cygnus_writel(cygnus_gpio, (i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_CLR_OFFSET, BIT(bit));
+
+			generic_handle_irq(child_irq);
+		}
+	}
+
+	chained_irq_exit(chip, desc);
+}
+
+
+static void cygnus_gpio_irq_ack(struct irq_data *d)
+{
+	struct cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset = CYGNUS_GPIO_REG(gpio,
+			CYGNUS_GPIO_INT_CLR_OFFSET);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val = BIT(shift);
+
+	cygnus_writel(cygnus_gpio, offset, val);
+}
+
+/**
+ *  cygnus_gpio_irq_set_mask - mask/unmask a GPIO interrupt
+ *
+ *  @d: IRQ chip data
+ *  @mask: mask/unmask GPIO interrupt. 0 - mask (disable); 1 - unmask (enable)
+ */
+static void cygnus_gpio_irq_set_mask(struct irq_data *d, int mask)
+{
+	struct cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_INT_MSK_OFFSET, gpio, mask);
+}
+
+static void cygnus_gpio_irq_mask(struct irq_data *d)
+{
+	struct cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_gpio_irq_set_mask(d, 0);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static void cygnus_gpio_irq_unmask(struct irq_data *d)
+{
+	struct cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_gpio_irq_set_mask(d, 1);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static int cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+	struct cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	int int_type = 0, dual_edge = 0, edge_lvl = 0;
+	unsigned long flags;
+
+	switch (type & IRQ_TYPE_SENSE_MASK) {
+	case IRQ_TYPE_EDGE_RISING:
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_EDGE_FALLING:
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		dual_edge = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_HIGH:
+		int_type = 1;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_LOW:
+		int_type = 1;
+		break;
+
+	default:
+		dev_err(cygnus_gpio->dev, "invalid GPIO IRQ type 0x%x\n",
+				type);
+		return -EINVAL;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_IN_TYPE_OFFSET, gpio,
+			int_type);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_INT_DE_OFFSET, gpio,
+			dual_edge);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_INT_EDGE_OFFSET, gpio,
+			edge_lvl);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+		"gpio:%u set int_type:%d dual_edge:%d edge_lvl:%d\n",
+		gpio, int_type, dual_edge, edge_lvl);
+
+	return 0;
+}
+
+static struct irq_chip cygnus_gpio_irq_chip = {
+	.name = "bcm-cygnus-gpio",
+	.irq_ack = cygnus_gpio_irq_ack,
+	.irq_mask = cygnus_gpio_irq_mask,
+	.irq_unmask = cygnus_gpio_irq_unmask,
+	.irq_set_type = cygnus_gpio_irq_set_type,
+};
+
+static int cygnus_gpio_direction_input(struct gpio_chip *gc, unsigned gpio)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 0);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u set input\n", gpio);
+
+	return 0;
+}
+
+static int cygnus_gpio_direction_output(struct gpio_chip *gc,
+		unsigned gpio, int value)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 1);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u set output, value:%d\n",
+			gpio, value);
+
+	return 0;
+}
+
+static void cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio,
+		int value)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u set, value:%d\n", gpio, value);
+}
+
+static int cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+	unsigned int offset = CYGNUS_GPIO_REG(gpio,
+			CYGNUS_GPIO_DATA_IN_OFFSET);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val;
+
+	val = cygnus_readl(cygnus_gpio, offset);
+	val = (val >> shift) & 1;
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u get, value:%d\n", gpio, val);
+
+	return val;
+}
+
+static struct lock_class_key gpio_lock_class;
+
+static int cygnus_gpio_irq_map(struct irq_domain *d, unsigned int irq,
+			       irq_hw_number_t hwirq)
+{
+	int ret;
+
+	ret = irq_set_chip_data(irq, d->host_data);
+	if (ret < 0)
+		return ret;
+	irq_set_lockdep_class(irq, &gpio_lock_class);
+	irq_set_chip_and_handler(irq, &cygnus_gpio_irq_chip,
+			handle_simple_irq);
+	set_irq_flags(irq, IRQF_VALID);
+
+	return 0;
+}
+
+static void cygnus_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
+{
+	irq_set_chip_and_handler(irq, NULL, NULL);
+	irq_set_chip_data(irq, NULL);
+}
+
+static struct irq_domain_ops cygnus_irq_ops = {
+	.map = cygnus_gpio_irq_map,
+	.unmap = cygnus_gpio_irq_unmap,
+	.xlate = irq_domain_xlate_twocell,
+};
+
+#ifdef CONFIG_OF_GPIO
+static void cygnus_gpio_set_pull(struct cygnus_gpio *cygnus_gpio,
+				 unsigned gpio, enum gpio_pull pull)
+{
+	int pullup;
+	unsigned long flags;
+
+	switch (pull) {
+	case GPIO_PULL_UP:
+		pullup = 1;
+		break;
+	case GPIO_PULL_DOWN:
+		pullup = 0;
+		break;
+	case GPIO_PULL_NONE:
+	case GPIO_PULL_INVALID:
+	default:
+		return;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	/* set pull up/down */
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_PAD_RES_OFFSET, gpio, pullup);
+	/* enable pad */
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_RES_EN_OFFSET, gpio, 1);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u set pullup:%d\n", gpio, pullup);
+}
+
+static void cygnus_gpio_set_strength(struct cygnus_gpio *cygnus_gpio,
+		unsigned gpio, enum gpio_drv_strength strength)
+{
+	struct device *dev = cygnus_gpio->dev;
+	void __iomem *base;
+	unsigned int i, offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	/* some GPIO controllers do not support drive strength configuration */
+	if (of_find_property(dev->of_node, "no-drv-strength", NULL))
+		return;
+
+	/*
+	 * Some GPIO controllers use a different register block for drive
+	 * strength control
+	 */
+	if (cygnus_gpio->io_ctrl) {
+		base = cygnus_gpio->io_ctrl;
+		offset = CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET;
+	} else {
+		base = cygnus_gpio->base;
+		offset = CYGNUS_GPIO_REG(gpio,
+				CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET);
+	}
+
+	shift = CYGNUS_GPIO_SHIFT(gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
+		val = readl(base + offset);
+		val &= ~BIT(shift);
+		val |= ((strength >> i) & 0x1) << shift;
+		writel(val, base + offset);
+		offset += 4;
+	}
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+			"gpio:%u set drive strength:%d\n", gpio, strength);
+}
+
+static int cygnus_gpio_of_xlate(struct gpio_chip *gc,
+		const struct of_phandle_args *gpiospec, u32 *flags)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+	enum gpio_pull pull;
+	enum gpio_drv_strength strength;
+
+	if (gc->of_gpio_n_cells < 2)
+		return -EINVAL;
+
+	if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
+		return -EINVAL;
+
+	if (gpiospec->args[0] >= gc->ngpio)
+		return -EINVAL;
+
+	pull = (gpiospec->args[1] >> GPIO_PULL_BIT_SHIFT) & GPIO_PULL_BIT_MASK;
+	if (WARN_ON(pull >= GPIO_PULL_INVALID))
+		return -EINVAL;
+
+	strength = (gpiospec->args[1] >> GPIO_DRV_STRENGTH_BIT_SHIFT) &
+		GPIO_DRV_STRENGTH_BIT_MASK;
+
+	if (flags)
+		*flags = gpiospec->args[1] & GPIO_FLAG_BIT_MASK;
+
+	cygnus_gpio_set_pull(cygnus_gpio, gpiospec->args[0], pull);
+	cygnus_gpio_set_strength(cygnus_gpio, gpiospec->args[0], strength);
+
+	return gpiospec->args[0];
+}
+#endif
+
+static const struct of_device_id cygnus_gpio_of_match[] = {
+	{ .compatible = "brcm,cygnus-gpio" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, cygnus_gpio_of_match);
+
+static int cygnus_gpio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+	struct cygnus_gpio *cygnus_gpio;
+	struct gpio_chip *gc;
+	u32 i, ngpios, gpio_base;
+	int ret;
+
+	cygnus_gpio = devm_kzalloc(dev, sizeof(*cygnus_gpio), GFP_KERNEL);
+	if (!cygnus_gpio)
+		return -ENOMEM;
+
+	cygnus_gpio->dev = dev;
+	platform_set_drvdata(pdev, cygnus_gpio);
+
+	if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
+		dev_err(&pdev->dev, "missing ngpios DT property\n");
+		return -ENODEV;
+	}
+	cygnus_gpio->num_banks = (ngpios + NGPIOS_PER_BANK - 1) /
+		NGPIOS_PER_BANK;
+
+	if (of_property_read_u32(dev->of_node, "linux,gpio-base",
+				&gpio_base)) {
+		dev_err(&pdev->dev, "missing linux,gpio-base DT property\n");
+		return -ENODEV;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	cygnus_gpio->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(cygnus_gpio->base)) {
+		dev_err(&pdev->dev, "unable to map I/O memory\n");
+		return PTR_ERR(cygnus_gpio->base);
+	}
+
+	/*
+	 * Only certain types of Cygnus GPIO interfaces have I/O control
+	 * registers
+	 */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (res) {
+		cygnus_gpio->io_ctrl = devm_ioremap_resource(dev, res);
+		if (IS_ERR(cygnus_gpio->io_ctrl)) {
+			dev_err(&pdev->dev, "unable to map I/O memory\n");
+			return PTR_ERR(cygnus_gpio->io_ctrl);
+		}
+	}
+
+	spin_lock_init(&cygnus_gpio->lock);
+
+	gc = &cygnus_gpio->gc;
+	gc->base = gpio_base;
+	gc->ngpio = ngpios;
+	gc->label = dev_name(dev);
+	gc->dev = dev;
+#ifdef CONFIG_OF_GPIO
+	gc->of_node = dev->of_node;
+	gc->of_gpio_n_cells = 2;
+	gc->of_xlate = cygnus_gpio_of_xlate;
+#endif
+	gc->direction_input = cygnus_gpio_direction_input;
+	gc->direction_output = cygnus_gpio_direction_output;
+	gc->set = cygnus_gpio_set;
+	gc->get = cygnus_gpio_get;
+	gc->to_irq = cygnus_gpio_to_irq;
+
+	ret = gpiochip_add(gc);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "unable to add GPIO chip\n");
+		return ret;
+	}
+
+	/*
+	 * Some of the GPIO interfaces do not have interrupt wired to the main
+	 * processor
+	 */
+	cygnus_gpio->irq = platform_get_irq(pdev, 0);
+	if (cygnus_gpio->irq < 0) {
+		ret = cygnus_gpio->irq;
+		if (ret == -EPROBE_DEFER)
+			goto err_rm_gpiochip;
+
+		dev_info(&pdev->dev, "no interrupt hook\n");
+	}
+
+	cygnus_gpio->irq_domain = irq_domain_add_linear(dev->of_node,
+			gc->ngpio, &cygnus_irq_ops, cygnus_gpio);
+	if (!cygnus_gpio->irq_domain) {
+		dev_err(&pdev->dev, "unable to allocate IRQ domain\n");
+		ret = -ENXIO;
+		goto err_rm_gpiochip;
+	}
+
+	for (i = 0; i < gc->ngpio; i++) {
+		int irq = irq_create_mapping(cygnus_gpio->irq_domain, i);
+
+		irq_set_lockdep_class(irq, &gpio_lock_class);
+		irq_set_chip_data(irq, cygnus_gpio);
+		irq_set_chip_and_handler(irq, &cygnus_gpio_irq_chip,
+				handle_simple_irq);
+		set_irq_flags(irq, IRQF_VALID);
+	}
+
+	irq_set_chained_handler(cygnus_gpio->irq, cygnus_gpio_irq_handler);
+	irq_set_handler_data(cygnus_gpio->irq, cygnus_gpio);
+
+	return 0;
+
+err_rm_gpiochip:
+	gpiochip_remove(gc);
+	return ret;
+}
+
+static struct platform_driver cygnus_gpio_driver = {
+	.driver = {
+		.name = "bcm-cygnus-gpio",
+		.owner = THIS_MODULE,
+		.of_match_table = cygnus_gpio_of_match,
+	},
+	.probe = cygnus_gpio_probe,
+};
+
+module_platform_driver(cygnus_gpio_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus GPIO Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v5 2/3] gpio: Cygnus: add GPIO driver

[Ray Jui]

This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller, 2) the
chipCommonG GPIO controller, and 3) the ALWAYS-ON GPIO controller

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/gpio/Kconfig           |   12 +
 drivers/gpio/Makefile          |    1 +
 drivers/gpio/gpio-bcm-cygnus.c |  613 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 626 insertions(+)
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 633ec21..1790ffd 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -126,6 +126,18 @@ config GPIO_74XX_MMIO
 	    8 bits:	74244 (Input), 74273 (Output)
 	    16 bits:	741624 (Input), 7416374 (Output)
 
+config GPIO_BCM_CYGNUS
+	bool "Broadcom Cygnus GPIO support"
+	depends on ARCH_BCM_CYGNUS && OF_GPIO
+	default y
+	help
+	  Say yes here to turn on GPIO support for Broadcom Cygnus SoC
+
+	  The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
+	  GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
+	  the always-ON GPIO controller (CRMU). All 3 GPIO controllers are
+	  supported by this driver
+
 config GPIO_CLPS711X
 	tristate "CLPS711X GPIO support"
 	depends on ARCH_CLPS711X || COMPILE_TEST
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 81755f1..31eb7e0 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_GPIO_ADP5520)	+= gpio-adp5520.o
 obj-$(CONFIG_GPIO_ADP5588)	+= gpio-adp5588.o
 obj-$(CONFIG_GPIO_AMD8111)	+= gpio-amd8111.o
 obj-$(CONFIG_GPIO_ARIZONA)	+= gpio-arizona.o
+obj-$(CONFIG_GPIO_BCM_CYGNUS)	+= gpio-bcm-cygnus.o
 obj-$(CONFIG_GPIO_BCM_KONA)	+= gpio-bcm-kona.o
 obj-$(CONFIG_GPIO_BT8XX)	+= gpio-bt8xx.o
 obj-$(CONFIG_GPIO_CLPS711X)	+= gpio-clps711x.o
diff --git a/drivers/gpio/gpio-bcm-cygnus.c b/drivers/gpio/gpio-bcm-cygnus.c
new file mode 100644
index 0000000..a6a7732
--- /dev/null
+++ b/drivers/gpio/gpio-bcm-cygnus.c
@@ -0,0 +1,613 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/ioport.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/irqchip/chained_irq.h>
+
+#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
+#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
+#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
+#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
+#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
+#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
+#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
+#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
+#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
+#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
+#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
+#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
+
+/* drive strength control for ASIU GPIO */
+#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
+
+/* drive strength control for CCM GPIO */
+#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00
+
+#define GPIO_BANK_SIZE 0x200
+#define NGPIOS_PER_BANK 32
+#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
+
+#define CYGNUS_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + (reg))
+#define CYGNUS_GPIO_SHIFT(pin) ((pin) % NGPIOS_PER_BANK)
+
+#define GPIO_FLAG_BIT_MASK           0xffff
+#define GPIO_PULL_BIT_SHIFT          16
+#define GPIO_PULL_BIT_MASK           0x3
+
+#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
+#define GPIO_DRV_STRENGTH_BITS       3
+#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
+
+/*
+ * For GPIO internal pull up/down registers
+ */
+enum gpio_pull {
+	GPIO_PULL_NONE = 0,
+	GPIO_PULL_UP,
+	GPIO_PULL_DOWN,
+	GPIO_PULL_INVALID,
+};
+
+/*
+ * GPIO drive strength
+ */
+enum gpio_drv_strength {
+	GPIO_DRV_STRENGTH_2MA = 0,
+	GPIO_DRV_STRENGTH_4MA,
+	GPIO_DRV_STRENGTH_6MA,
+	GPIO_DRV_STRENGTH_8MA,
+	GPIO_DRV_STRENGTH_10MA,
+	GPIO_DRV_STRENGTH_12MA,
+	GPIO_DRV_STRENGTH_14MA,
+	GPIO_DRV_STRENGTH_16MA,
+	GPIO_DRV_STRENGTH_INVALID,
+};
+
+struct cygnus_gpio {
+	struct device *dev;
+	void __iomem *base;
+	void __iomem *io_ctrl;
+	spinlock_t lock;
+	struct gpio_chip gc;
+	unsigned num_banks;
+	int irq;
+	struct irq_domain *irq_domain;
+};
+
+static struct cygnus_gpio *to_cygnus_gpio(struct gpio_chip *gc)
+{
+	return container_of(gc, struct cygnus_gpio, gc);
+}
+
+static u32 cygnus_readl(struct cygnus_gpio *cygnus_gpio, unsigned int offset)
+{
+	return readl(cygnus_gpio->base + offset);
+}
+
+static void cygnus_writel(struct cygnus_gpio *cygnus_gpio,
+			  unsigned int offset, u32 val)
+{
+	writel(val, cygnus_gpio->base + offset);
+}
+
+/**
+ *  cygnus_set_bit - set or clear one bit (corresponding to the GPIO pin) in a
+ *  Cygnus GPIO register
+ *
+ *  @cygnus_gpio: Cygnus GPIO device
+ *  @reg: register offset
+ *  @gpio: GPIO pin
+ *  @set: set or clear. 1 - set; 0 -clear
+ */
+static void cygnus_set_bit(struct cygnus_gpio *cygnus_gpio,
+			   unsigned int reg, unsigned gpio, int set)
+{
+	unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val;
+
+	val = cygnus_readl(cygnus_gpio, offset);
+	if (set)
+		val |= BIT(shift);
+	else
+		val &= ~BIT(shift);
+	cygnus_writel(cygnus_gpio, offset, val);
+}
+
+static int cygnus_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+
+	return irq_find_mapping(cygnus_gpio->irq_domain, offset);
+}
+
+static void cygnus_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+	struct cygnus_gpio *cygnus_gpio;
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	int i, bit;
+
+	chained_irq_enter(chip, desc);
+
+	cygnus_gpio = irq_get_handler_data(irq);
+
+	/* go through the entire GPIO banks and handle all interrupts */
+	for (i = 0; i < cygnus_gpio->num_banks; i++) {
+		unsigned long val = cygnus_readl(cygnus_gpio,
+				(i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_MSTAT_OFFSET);
+
+		for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
+			unsigned pin = NGPIOS_PER_BANK * i + bit;
+			int child_irq =
+				cygnus_gpio_to_irq(&cygnus_gpio->gc, pin);
+
+			/*
+			 * Clear the interrupt before invoking the
+			 * handler, so we do not leave any window
+			 */
+			cygnus_writel(cygnus_gpio, (i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_CLR_OFFSET, BIT(bit));
+
+			generic_handle_irq(child_irq);
+		}
+	}
+
+	chained_irq_exit(chip, desc);
+}
+
+
+static void cygnus_gpio_irq_ack(struct irq_data *d)
+{
+	struct cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset = CYGNUS_GPIO_REG(gpio,
+			CYGNUS_GPIO_INT_CLR_OFFSET);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val = BIT(shift);
+
+	cygnus_writel(cygnus_gpio, offset, val);
+}
+
+/**
+ *  cygnus_gpio_irq_set_mask - mask/unmask a GPIO interrupt
+ *
+ *  @d: IRQ chip data
+ *  @mask: mask/unmask GPIO interrupt. 0 - mask (disable); 1 - unmask (enable)
+ */
+static void cygnus_gpio_irq_set_mask(struct irq_data *d, int mask)
+{
+	struct cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_INT_MSK_OFFSET, gpio, mask);
+}
+
+static void cygnus_gpio_irq_mask(struct irq_data *d)
+{
+	struct cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_gpio_irq_set_mask(d, 0);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static void cygnus_gpio_irq_unmask(struct irq_data *d)
+{
+	struct cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_gpio_irq_set_mask(d, 1);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static int cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+	struct cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	int int_type = 0, dual_edge = 0, edge_lvl = 0;
+	unsigned long flags;
+
+	switch (type & IRQ_TYPE_SENSE_MASK) {
+	case IRQ_TYPE_EDGE_RISING:
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_EDGE_FALLING:
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		dual_edge = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_HIGH:
+		int_type = 1;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_LOW:
+		int_type = 1;
+		break;
+
+	default:
+		dev_err(cygnus_gpio->dev, "invalid GPIO IRQ type 0x%x\n",
+				type);
+		return -EINVAL;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_IN_TYPE_OFFSET, gpio,
+			int_type);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_INT_DE_OFFSET, gpio,
+			dual_edge);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_INT_EDGE_OFFSET, gpio,
+			edge_lvl);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+		"gpio:%u set int_type:%d dual_edge:%d edge_lvl:%d\n",
+		gpio, int_type, dual_edge, edge_lvl);
+
+	return 0;
+}
+
+static struct irq_chip cygnus_gpio_irq_chip = {
+	.name = "bcm-cygnus-gpio",
+	.irq_ack = cygnus_gpio_irq_ack,
+	.irq_mask = cygnus_gpio_irq_mask,
+	.irq_unmask = cygnus_gpio_irq_unmask,
+	.irq_set_type = cygnus_gpio_irq_set_type,
+};
+
+static int cygnus_gpio_direction_input(struct gpio_chip *gc, unsigned gpio)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 0);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u set input\n", gpio);
+
+	return 0;
+}
+
+static int cygnus_gpio_direction_output(struct gpio_chip *gc,
+		unsigned gpio, int value)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 1);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u set output, value:%d\n",
+			gpio, value);
+
+	return 0;
+}
+
+static void cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio,
+		int value)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u set, value:%d\n", gpio, value);
+}
+
+static int cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+	unsigned int offset = CYGNUS_GPIO_REG(gpio,
+			CYGNUS_GPIO_DATA_IN_OFFSET);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val;
+
+	val = cygnus_readl(cygnus_gpio, offset);
+	val = (val >> shift) & 1;
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u get, value:%d\n", gpio, val);
+
+	return val;
+}
+
+static struct lock_class_key gpio_lock_class;
+
+static int cygnus_gpio_irq_map(struct irq_domain *d, unsigned int irq,
+			       irq_hw_number_t hwirq)
+{
+	int ret;
+
+	ret = irq_set_chip_data(irq, d->host_data);
+	if (ret < 0)
+		return ret;
+	irq_set_lockdep_class(irq, &gpio_lock_class);
+	irq_set_chip_and_handler(irq, &cygnus_gpio_irq_chip,
+			handle_simple_irq);
+	set_irq_flags(irq, IRQF_VALID);
+
+	return 0;
+}
+
+static void cygnus_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
+{
+	irq_set_chip_and_handler(irq, NULL, NULL);
+	irq_set_chip_data(irq, NULL);
+}
+
+static struct irq_domain_ops cygnus_irq_ops = {
+	.map = cygnus_gpio_irq_map,
+	.unmap = cygnus_gpio_irq_unmap,
+	.xlate = irq_domain_xlate_twocell,
+};
+
+#ifdef CONFIG_OF_GPIO
+static void cygnus_gpio_set_pull(struct cygnus_gpio *cygnus_gpio,
+				 unsigned gpio, enum gpio_pull pull)
+{
+	int pullup;
+	unsigned long flags;
+
+	switch (pull) {
+	case GPIO_PULL_UP:
+		pullup = 1;
+		break;
+	case GPIO_PULL_DOWN:
+		pullup = 0;
+		break;
+	case GPIO_PULL_NONE:
+	case GPIO_PULL_INVALID:
+	default:
+		return;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	/* set pull up/down */
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_PAD_RES_OFFSET, gpio, pullup);
+	/* enable pad */
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_RES_EN_OFFSET, gpio, 1);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u set pullup:%d\n", gpio, pullup);
+}
+
+static void cygnus_gpio_set_strength(struct cygnus_gpio *cygnus_gpio,
+		unsigned gpio, enum gpio_drv_strength strength)
+{
+	struct device *dev = cygnus_gpio->dev;
+	void __iomem *base;
+	unsigned int i, offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	/* some GPIO controllers do not support drive strength configuration */
+	if (of_find_property(dev->of_node, "no-drv-strength", NULL))
+		return;
+
+	/*
+	 * Some GPIO controllers use a different register block for drive
+	 * strength control
+	 */
+	if (cygnus_gpio->io_ctrl) {
+		base = cygnus_gpio->io_ctrl;
+		offset = CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET;
+	} else {
+		base = cygnus_gpio->base;
+		offset = CYGNUS_GPIO_REG(gpio,
+				CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET);
+	}
+
+	shift = CYGNUS_GPIO_SHIFT(gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
+		val = readl(base + offset);
+		val &= ~BIT(shift);
+		val |= ((strength >> i) & 0x1) << shift;
+		writel(val, base + offset);
+		offset += 4;
+	}
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+			"gpio:%u set drive strength:%d\n", gpio, strength);
+}
+
+static int cygnus_gpio_of_xlate(struct gpio_chip *gc,
+		const struct of_phandle_args *gpiospec, u32 *flags)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+	enum gpio_pull pull;
+	enum gpio_drv_strength strength;
+
+	if (gc->of_gpio_n_cells < 2)
+		return -EINVAL;
+
+	if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
+		return -EINVAL;
+
+	if (gpiospec->args[0] >= gc->ngpio)
+		return -EINVAL;
+
+	pull = (gpiospec->args[1] >> GPIO_PULL_BIT_SHIFT) & GPIO_PULL_BIT_MASK;
+	if (WARN_ON(pull >= GPIO_PULL_INVALID))
+		return -EINVAL;
+
+	strength = (gpiospec->args[1] >> GPIO_DRV_STRENGTH_BIT_SHIFT) &
+		GPIO_DRV_STRENGTH_BIT_MASK;
+
+	if (flags)
+		*flags = gpiospec->args[1] & GPIO_FLAG_BIT_MASK;
+
+	cygnus_gpio_set_pull(cygnus_gpio, gpiospec->args[0], pull);
+	cygnus_gpio_set_strength(cygnus_gpio, gpiospec->args[0], strength);
+
+	return gpiospec->args[0];
+}
+#endif
+
+static const struct of_device_id cygnus_gpio_of_match[] = {
+	{ .compatible = "brcm,cygnus-gpio" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, cygnus_gpio_of_match);
+
+static int cygnus_gpio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+	struct cygnus_gpio *cygnus_gpio;
+	struct gpio_chip *gc;
+	u32 i, ngpios, gpio_base;
+	int ret;
+
+	cygnus_gpio = devm_kzalloc(dev, sizeof(*cygnus_gpio), GFP_KERNEL);
+	if (!cygnus_gpio)
+		return -ENOMEM;
+
+	cygnus_gpio->dev = dev;
+	platform_set_drvdata(pdev, cygnus_gpio);
+
+	if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
+		dev_err(&pdev->dev, "missing ngpios DT property\n");
+		return -ENODEV;
+	}
+	cygnus_gpio->num_banks = (ngpios + NGPIOS_PER_BANK - 1) /
+		NGPIOS_PER_BANK;
+
+	if (of_property_read_u32(dev->of_node, "linux,gpio-base",
+				&gpio_base)) {
+		dev_err(&pdev->dev, "missing linux,gpio-base DT property\n");
+		return -ENODEV;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	cygnus_gpio->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(cygnus_gpio->base)) {
+		dev_err(&pdev->dev, "unable to map I/O memory\n");
+		return PTR_ERR(cygnus_gpio->base);
+	}
+
+	/*
+	 * Only certain types of Cygnus GPIO interfaces have I/O control
+	 * registers
+	 */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (res) {
+		cygnus_gpio->io_ctrl = devm_ioremap_resource(dev, res);
+		if (IS_ERR(cygnus_gpio->io_ctrl)) {
+			dev_err(&pdev->dev, "unable to map I/O memory\n");
+			return PTR_ERR(cygnus_gpio->io_ctrl);
+		}
+	}
+
+	spin_lock_init(&cygnus_gpio->lock);
+
+	gc = &cygnus_gpio->gc;
+	gc->base = gpio_base;
+	gc->ngpio = ngpios;
+	gc->label = dev_name(dev);
+	gc->dev = dev;
+#ifdef CONFIG_OF_GPIO
+	gc->of_node = dev->of_node;
+	gc->of_gpio_n_cells = 2;
+	gc->of_xlate = cygnus_gpio_of_xlate;
+#endif
+	gc->direction_input = cygnus_gpio_direction_input;
+	gc->direction_output = cygnus_gpio_direction_output;
+	gc->set = cygnus_gpio_set;
+	gc->get = cygnus_gpio_get;
+	gc->to_irq = cygnus_gpio_to_irq;
+
+	ret = gpiochip_add(gc);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "unable to add GPIO chip\n");
+		return ret;
+	}
+
+	/*
+	 * Some of the GPIO interfaces do not have interrupt wired to the main
+	 * processor
+	 */
+	cygnus_gpio->irq = platform_get_irq(pdev, 0);
+	if (cygnus_gpio->irq < 0) {
+		ret = cygnus_gpio->irq;
+		if (ret == -EPROBE_DEFER)
+			goto err_rm_gpiochip;
+
+		dev_info(&pdev->dev, "no interrupt hook\n");
+	}
+
+	cygnus_gpio->irq_domain = irq_domain_add_linear(dev->of_node,
+			gc->ngpio, &cygnus_irq_ops, cygnus_gpio);
+	if (!cygnus_gpio->irq_domain) {
+		dev_err(&pdev->dev, "unable to allocate IRQ domain\n");
+		ret = -ENXIO;
+		goto err_rm_gpiochip;
+	}
+
+	for (i = 0; i < gc->ngpio; i++) {
+		int irq = irq_create_mapping(cygnus_gpio->irq_domain, i);
+
+		irq_set_lockdep_class(irq, &gpio_lock_class);
+		irq_set_chip_data(irq, cygnus_gpio);
+		irq_set_chip_and_handler(irq, &cygnus_gpio_irq_chip,
+				handle_simple_irq);
+		set_irq_flags(irq, IRQF_VALID);
+	}
+
+	irq_set_chained_handler(cygnus_gpio->irq, cygnus_gpio_irq_handler);
+	irq_set_handler_data(cygnus_gpio->irq, cygnus_gpio);
+
+	return 0;
+
+err_rm_gpiochip:
+	gpiochip_remove(gc);
+	return ret;
+}
+
+static struct platform_driver cygnus_gpio_driver = {
+	.driver = {
+		.name = "bcm-cygnus-gpio",
+		.owner = THIS_MODULE,
+		.of_match_table = cygnus_gpio_of_match,
+	},
+	.probe = cygnus_gpio_probe,
+};
+
+module_platform_driver(cygnus_gpio_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus GPIO Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v5 2/3] gpio: Cygnus: add GPIO driver

[Ray Jui]

This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller, 2) the
chipCommonG GPIO controller, and 3) the ALWAYS-ON GPIO controller

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/gpio/Kconfig           |   12 +
 drivers/gpio/Makefile          |    1 +
 drivers/gpio/gpio-bcm-cygnus.c |  613 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 626 insertions(+)
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 633ec21..1790ffd 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -126,6 +126,18 @@ config GPIO_74XX_MMIO
 	    8 bits:	74244 (Input), 74273 (Output)
 	    16 bits:	741624 (Input), 7416374 (Output)
 
+config GPIO_BCM_CYGNUS
+	bool "Broadcom Cygnus GPIO support"
+	depends on ARCH_BCM_CYGNUS && OF_GPIO
+	default y
+	help
+	  Say yes here to turn on GPIO support for Broadcom Cygnus SoC
+
+	  The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
+	  GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
+	  the always-ON GPIO controller (CRMU). All 3 GPIO controllers are
+	  supported by this driver
+
 config GPIO_CLPS711X
 	tristate "CLPS711X GPIO support"
 	depends on ARCH_CLPS711X || COMPILE_TEST
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 81755f1..31eb7e0 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_GPIO_ADP5520)	+= gpio-adp5520.o
 obj-$(CONFIG_GPIO_ADP5588)	+= gpio-adp5588.o
 obj-$(CONFIG_GPIO_AMD8111)	+= gpio-amd8111.o
 obj-$(CONFIG_GPIO_ARIZONA)	+= gpio-arizona.o
+obj-$(CONFIG_GPIO_BCM_CYGNUS)	+= gpio-bcm-cygnus.o
 obj-$(CONFIG_GPIO_BCM_KONA)	+= gpio-bcm-kona.o
 obj-$(CONFIG_GPIO_BT8XX)	+= gpio-bt8xx.o
 obj-$(CONFIG_GPIO_CLPS711X)	+= gpio-clps711x.o
diff --git a/drivers/gpio/gpio-bcm-cygnus.c b/drivers/gpio/gpio-bcm-cygnus.c
new file mode 100644
index 0000000..a6a7732
--- /dev/null
+++ b/drivers/gpio/gpio-bcm-cygnus.c
@@ -0,0 +1,613 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/ioport.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/irqchip/chained_irq.h>
+
+#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
+#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
+#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
+#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
+#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
+#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
+#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
+#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
+#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
+#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
+#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
+#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
+
+/* drive strength control for ASIU GPIO */
+#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
+
+/* drive strength control for CCM GPIO */
+#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00
+
+#define GPIO_BANK_SIZE 0x200
+#define NGPIOS_PER_BANK 32
+#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
+
+#define CYGNUS_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + (reg))
+#define CYGNUS_GPIO_SHIFT(pin) ((pin) % NGPIOS_PER_BANK)
+
+#define GPIO_FLAG_BIT_MASK           0xffff
+#define GPIO_PULL_BIT_SHIFT          16
+#define GPIO_PULL_BIT_MASK           0x3
+
+#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
+#define GPIO_DRV_STRENGTH_BITS       3
+#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
+
+/*
+ * For GPIO internal pull up/down registers
+ */
+enum gpio_pull {
+	GPIO_PULL_NONE = 0,
+	GPIO_PULL_UP,
+	GPIO_PULL_DOWN,
+	GPIO_PULL_INVALID,
+};
+
+/*
+ * GPIO drive strength
+ */
+enum gpio_drv_strength {
+	GPIO_DRV_STRENGTH_2MA = 0,
+	GPIO_DRV_STRENGTH_4MA,
+	GPIO_DRV_STRENGTH_6MA,
+	GPIO_DRV_STRENGTH_8MA,
+	GPIO_DRV_STRENGTH_10MA,
+	GPIO_DRV_STRENGTH_12MA,
+	GPIO_DRV_STRENGTH_14MA,
+	GPIO_DRV_STRENGTH_16MA,
+	GPIO_DRV_STRENGTH_INVALID,
+};
+
+struct cygnus_gpio {
+	struct device *dev;
+	void __iomem *base;
+	void __iomem *io_ctrl;
+	spinlock_t lock;
+	struct gpio_chip gc;
+	unsigned num_banks;
+	int irq;
+	struct irq_domain *irq_domain;
+};
+
+static struct cygnus_gpio *to_cygnus_gpio(struct gpio_chip *gc)
+{
+	return container_of(gc, struct cygnus_gpio, gc);
+}
+
+static u32 cygnus_readl(struct cygnus_gpio *cygnus_gpio, unsigned int offset)
+{
+	return readl(cygnus_gpio->base + offset);
+}
+
+static void cygnus_writel(struct cygnus_gpio *cygnus_gpio,
+			  unsigned int offset, u32 val)
+{
+	writel(val, cygnus_gpio->base + offset);
+}
+
+/**
+ *  cygnus_set_bit - set or clear one bit (corresponding to the GPIO pin) in a
+ *  Cygnus GPIO register
+ *
+ *  @cygnus_gpio: Cygnus GPIO device
+ *  @reg: register offset
+ *  @gpio: GPIO pin
+ *  @set: set or clear. 1 - set; 0 -clear
+ */
+static void cygnus_set_bit(struct cygnus_gpio *cygnus_gpio,
+			   unsigned int reg, unsigned gpio, int set)
+{
+	unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val;
+
+	val = cygnus_readl(cygnus_gpio, offset);
+	if (set)
+		val |= BIT(shift);
+	else
+		val &= ~BIT(shift);
+	cygnus_writel(cygnus_gpio, offset, val);
+}
+
+static int cygnus_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+
+	return irq_find_mapping(cygnus_gpio->irq_domain, offset);
+}
+
+static void cygnus_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+	struct cygnus_gpio *cygnus_gpio;
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	int i, bit;
+
+	chained_irq_enter(chip, desc);
+
+	cygnus_gpio = irq_get_handler_data(irq);
+
+	/* go through the entire GPIO banks and handle all interrupts */
+	for (i = 0; i < cygnus_gpio->num_banks; i++) {
+		unsigned long val = cygnus_readl(cygnus_gpio,
+				(i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_MSTAT_OFFSET);
+
+		for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
+			unsigned pin = NGPIOS_PER_BANK * i + bit;
+			int child_irq =
+				cygnus_gpio_to_irq(&cygnus_gpio->gc, pin);
+
+			/*
+			 * Clear the interrupt before invoking the
+			 * handler, so we do not leave any window
+			 */
+			cygnus_writel(cygnus_gpio, (i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_CLR_OFFSET, BIT(bit));
+
+			generic_handle_irq(child_irq);
+		}
+	}
+
+	chained_irq_exit(chip, desc);
+}
+
+
+static void cygnus_gpio_irq_ack(struct irq_data *d)
+{
+	struct cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset = CYGNUS_GPIO_REG(gpio,
+			CYGNUS_GPIO_INT_CLR_OFFSET);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val = BIT(shift);
+
+	cygnus_writel(cygnus_gpio, offset, val);
+}
+
+/**
+ *  cygnus_gpio_irq_set_mask - mask/unmask a GPIO interrupt
+ *
+ *  @d: IRQ chip data
+ *  @mask: mask/unmask GPIO interrupt. 0 - mask (disable); 1 - unmask (enable)
+ */
+static void cygnus_gpio_irq_set_mask(struct irq_data *d, int mask)
+{
+	struct cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_INT_MSK_OFFSET, gpio, mask);
+}
+
+static void cygnus_gpio_irq_mask(struct irq_data *d)
+{
+	struct cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_gpio_irq_set_mask(d, 0);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static void cygnus_gpio_irq_unmask(struct irq_data *d)
+{
+	struct cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_gpio_irq_set_mask(d, 1);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static int cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+	struct cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	int int_type = 0, dual_edge = 0, edge_lvl = 0;
+	unsigned long flags;
+
+	switch (type & IRQ_TYPE_SENSE_MASK) {
+	case IRQ_TYPE_EDGE_RISING:
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_EDGE_FALLING:
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		dual_edge = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_HIGH:
+		int_type = 1;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_LOW:
+		int_type = 1;
+		break;
+
+	default:
+		dev_err(cygnus_gpio->dev, "invalid GPIO IRQ type 0x%x\n",
+				type);
+		return -EINVAL;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_IN_TYPE_OFFSET, gpio,
+			int_type);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_INT_DE_OFFSET, gpio,
+			dual_edge);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_INT_EDGE_OFFSET, gpio,
+			edge_lvl);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+		"gpio:%u set int_type:%d dual_edge:%d edge_lvl:%d\n",
+		gpio, int_type, dual_edge, edge_lvl);
+
+	return 0;
+}
+
+static struct irq_chip cygnus_gpio_irq_chip = {
+	.name = "bcm-cygnus-gpio",
+	.irq_ack = cygnus_gpio_irq_ack,
+	.irq_mask = cygnus_gpio_irq_mask,
+	.irq_unmask = cygnus_gpio_irq_unmask,
+	.irq_set_type = cygnus_gpio_irq_set_type,
+};
+
+static int cygnus_gpio_direction_input(struct gpio_chip *gc, unsigned gpio)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 0);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u set input\n", gpio);
+
+	return 0;
+}
+
+static int cygnus_gpio_direction_output(struct gpio_chip *gc,
+		unsigned gpio, int value)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 1);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u set output, value:%d\n",
+			gpio, value);
+
+	return 0;
+}
+
+static void cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio,
+		int value)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u set, value:%d\n", gpio, value);
+}
+
+static int cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+	unsigned int offset = CYGNUS_GPIO_REG(gpio,
+			CYGNUS_GPIO_DATA_IN_OFFSET);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val;
+
+	val = cygnus_readl(cygnus_gpio, offset);
+	val = (val >> shift) & 1;
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u get, value:%d\n", gpio, val);
+
+	return val;
+}
+
+static struct lock_class_key gpio_lock_class;
+
+static int cygnus_gpio_irq_map(struct irq_domain *d, unsigned int irq,
+			       irq_hw_number_t hwirq)
+{
+	int ret;
+
+	ret = irq_set_chip_data(irq, d->host_data);
+	if (ret < 0)
+		return ret;
+	irq_set_lockdep_class(irq, &gpio_lock_class);
+	irq_set_chip_and_handler(irq, &cygnus_gpio_irq_chip,
+			handle_simple_irq);
+	set_irq_flags(irq, IRQF_VALID);
+
+	return 0;
+}
+
+static void cygnus_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
+{
+	irq_set_chip_and_handler(irq, NULL, NULL);
+	irq_set_chip_data(irq, NULL);
+}
+
+static struct irq_domain_ops cygnus_irq_ops = {
+	.map = cygnus_gpio_irq_map,
+	.unmap = cygnus_gpio_irq_unmap,
+	.xlate = irq_domain_xlate_twocell,
+};
+
+#ifdef CONFIG_OF_GPIO
+static void cygnus_gpio_set_pull(struct cygnus_gpio *cygnus_gpio,
+				 unsigned gpio, enum gpio_pull pull)
+{
+	int pullup;
+	unsigned long flags;
+
+	switch (pull) {
+	case GPIO_PULL_UP:
+		pullup = 1;
+		break;
+	case GPIO_PULL_DOWN:
+		pullup = 0;
+		break;
+	case GPIO_PULL_NONE:
+	case GPIO_PULL_INVALID:
+	default:
+		return;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	/* set pull up/down */
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_PAD_RES_OFFSET, gpio, pullup);
+	/* enable pad */
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_RES_EN_OFFSET, gpio, 1);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u set pullup:%d\n", gpio, pullup);
+}
+
+static void cygnus_gpio_set_strength(struct cygnus_gpio *cygnus_gpio,
+		unsigned gpio, enum gpio_drv_strength strength)
+{
+	struct device *dev = cygnus_gpio->dev;
+	void __iomem *base;
+	unsigned int i, offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	/* some GPIO controllers do not support drive strength configuration */
+	if (of_find_property(dev->of_node, "no-drv-strength", NULL))
+		return;
+
+	/*
+	 * Some GPIO controllers use a different register block for drive
+	 * strength control
+	 */
+	if (cygnus_gpio->io_ctrl) {
+		base = cygnus_gpio->io_ctrl;
+		offset = CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET;
+	} else {
+		base = cygnus_gpio->base;
+		offset = CYGNUS_GPIO_REG(gpio,
+				CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET);
+	}
+
+	shift = CYGNUS_GPIO_SHIFT(gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
+		val = readl(base + offset);
+		val &= ~BIT(shift);
+		val |= ((strength >> i) & 0x1) << shift;
+		writel(val, base + offset);
+		offset += 4;
+	}
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+			"gpio:%u set drive strength:%d\n", gpio, strength);
+}
+
+static int cygnus_gpio_of_xlate(struct gpio_chip *gc,
+		const struct of_phandle_args *gpiospec, u32 *flags)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+	enum gpio_pull pull;
+	enum gpio_drv_strength strength;
+
+	if (gc->of_gpio_n_cells < 2)
+		return -EINVAL;
+
+	if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
+		return -EINVAL;
+
+	if (gpiospec->args[0] >= gc->ngpio)
+		return -EINVAL;
+
+	pull = (gpiospec->args[1] >> GPIO_PULL_BIT_SHIFT) & GPIO_PULL_BIT_MASK;
+	if (WARN_ON(pull >= GPIO_PULL_INVALID))
+		return -EINVAL;
+
+	strength = (gpiospec->args[1] >> GPIO_DRV_STRENGTH_BIT_SHIFT) &
+		GPIO_DRV_STRENGTH_BIT_MASK;
+
+	if (flags)
+		*flags = gpiospec->args[1] & GPIO_FLAG_BIT_MASK;
+
+	cygnus_gpio_set_pull(cygnus_gpio, gpiospec->args[0], pull);
+	cygnus_gpio_set_strength(cygnus_gpio, gpiospec->args[0], strength);
+
+	return gpiospec->args[0];
+}
+#endif
+
+static const struct of_device_id cygnus_gpio_of_match[] = {
+	{ .compatible = "brcm,cygnus-gpio" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, cygnus_gpio_of_match);
+
+static int cygnus_gpio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+	struct cygnus_gpio *cygnus_gpio;
+	struct gpio_chip *gc;
+	u32 i, ngpios, gpio_base;
+	int ret;
+
+	cygnus_gpio = devm_kzalloc(dev, sizeof(*cygnus_gpio), GFP_KERNEL);
+	if (!cygnus_gpio)
+		return -ENOMEM;
+
+	cygnus_gpio->dev = dev;
+	platform_set_drvdata(pdev, cygnus_gpio);
+
+	if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
+		dev_err(&pdev->dev, "missing ngpios DT property\n");
+		return -ENODEV;
+	}
+	cygnus_gpio->num_banks = (ngpios + NGPIOS_PER_BANK - 1) /
+		NGPIOS_PER_BANK;
+
+	if (of_property_read_u32(dev->of_node, "linux,gpio-base",
+				&gpio_base)) {
+		dev_err(&pdev->dev, "missing linux,gpio-base DT property\n");
+		return -ENODEV;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	cygnus_gpio->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(cygnus_gpio->base)) {
+		dev_err(&pdev->dev, "unable to map I/O memory\n");
+		return PTR_ERR(cygnus_gpio->base);
+	}
+
+	/*
+	 * Only certain types of Cygnus GPIO interfaces have I/O control
+	 * registers
+	 */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (res) {
+		cygnus_gpio->io_ctrl = devm_ioremap_resource(dev, res);
+		if (IS_ERR(cygnus_gpio->io_ctrl)) {
+			dev_err(&pdev->dev, "unable to map I/O memory\n");
+			return PTR_ERR(cygnus_gpio->io_ctrl);
+		}
+	}
+
+	spin_lock_init(&cygnus_gpio->lock);
+
+	gc = &cygnus_gpio->gc;
+	gc->base = gpio_base;
+	gc->ngpio = ngpios;
+	gc->label = dev_name(dev);
+	gc->dev = dev;
+#ifdef CONFIG_OF_GPIO
+	gc->of_node = dev->of_node;
+	gc->of_gpio_n_cells = 2;
+	gc->of_xlate = cygnus_gpio_of_xlate;
+#endif
+	gc->direction_input = cygnus_gpio_direction_input;
+	gc->direction_output = cygnus_gpio_direction_output;
+	gc->set = cygnus_gpio_set;
+	gc->get = cygnus_gpio_get;
+	gc->to_irq = cygnus_gpio_to_irq;
+
+	ret = gpiochip_add(gc);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "unable to add GPIO chip\n");
+		return ret;
+	}
+
+	/*
+	 * Some of the GPIO interfaces do not have interrupt wired to the main
+	 * processor
+	 */
+	cygnus_gpio->irq = platform_get_irq(pdev, 0);
+	if (cygnus_gpio->irq < 0) {
+		ret = cygnus_gpio->irq;
+		if (ret == -EPROBE_DEFER)
+			goto err_rm_gpiochip;
+
+		dev_info(&pdev->dev, "no interrupt hook\n");
+	}
+
+	cygnus_gpio->irq_domain = irq_domain_add_linear(dev->of_node,
+			gc->ngpio, &cygnus_irq_ops, cygnus_gpio);
+	if (!cygnus_gpio->irq_domain) {
+		dev_err(&pdev->dev, "unable to allocate IRQ domain\n");
+		ret = -ENXIO;
+		goto err_rm_gpiochip;
+	}
+
+	for (i = 0; i < gc->ngpio; i++) {
+		int irq = irq_create_mapping(cygnus_gpio->irq_domain, i);
+
+		irq_set_lockdep_class(irq, &gpio_lock_class);
+		irq_set_chip_data(irq, cygnus_gpio);
+		irq_set_chip_and_handler(irq, &cygnus_gpio_irq_chip,
+				handle_simple_irq);
+		set_irq_flags(irq, IRQF_VALID);
+	}
+
+	irq_set_chained_handler(cygnus_gpio->irq, cygnus_gpio_irq_handler);
+	irq_set_handler_data(cygnus_gpio->irq, cygnus_gpio);
+
+	return 0;
+
+err_rm_gpiochip:
+	gpiochip_remove(gc);
+	return ret;
+}
+
+static struct platform_driver cygnus_gpio_driver = {
+	.driver = {
+		.name = "bcm-cygnus-gpio",
+		.owner = THIS_MODULE,
+		.of_match_table = cygnus_gpio_of_match,
+	},
+	.probe = cygnus_gpio_probe,
+};
+
+module_platform_driver(cygnus_gpio_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus GPIO Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v5 3/3] ARM: dts: enable GPIO for Broadcom Cygnus

[Ray Jui]

This enables all 3 GPIO controllers including the ASIU GPIO, the
chipcommonG GPIO, and the ALWAYS-ON GPIO, for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..35272b7 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -54,6 +54,39 @@
 
 	/include/ "bcm-cygnus-clock.dtsi"
 
+	gpio_ccm: gpio@1800a000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x1800a000 0x50>,
+			<0x0301d164 0x20>;
+		ngpios = <24>;
+		linux,gpio-base = <0>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+	};
+
+	gpio_asiu: gpio@180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		linux,gpio-base = <24>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio@03024800 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		linux,gpio-base = <146>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-drv-strength;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

[PATCH v5 3/3] ARM: dts: enable GPIO for Broadcom Cygnus

[Ray Jui]

This enables all 3 GPIO controllers including the ASIU GPIO, the
chipcommonG GPIO, and the ALWAYS-ON GPIO, for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..35272b7 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -54,6 +54,39 @@
 
 	/include/ "bcm-cygnus-clock.dtsi"
 
+	gpio_ccm: gpio@1800a000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x1800a000 0x50>,
+			<0x0301d164 0x20>;
+		ngpios = <24>;
+		linux,gpio-base = <0>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+	};
+
+	gpio_asiu: gpio@180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		linux,gpio-base = <24>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio@03024800 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		linux,gpio-base = <146>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-drv-strength;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

[PATCH v5 3/3] ARM: dts: enable GPIO for Broadcom Cygnus

[Ray Jui]

This enables all 3 GPIO controllers including the ASIU GPIO, the
chipcommonG GPIO, and the ALWAYS-ON GPIO, for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..35272b7 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -54,6 +54,39 @@
 
 	/include/ "bcm-cygnus-clock.dtsi"
 
+	gpio_ccm: gpio at 1800a000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x1800a000 0x50>,
+			<0x0301d164 0x20>;
+		ngpios = <24>;
+		linux,gpio-base = <0>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+	};
+
+	gpio_asiu: gpio at 180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		linux,gpio-base = <24>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio at 03024800 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		linux,gpio-base = <146>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-drv-strength;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

[PATCH v2 0/4] Add PCIe support to Broadcom iProc

[Ray Jui]

This patchset contains the initial PCIe support for Broadcom iProc family of
SoCs. This driver has been validated with Cygnus and NSP and is expected to
work on other iProc family of SoCs that deploy the same PCIe controller

Changes from v1:
 - Add standard PCI interrupt DT properties "#interrupt-cells",
   "interrupt-map-mask" and "interrupt-map" so legacy INTx interrupts can be
   supported by using standard PCI OF IRQ parsing function
 - Get rid of custom IRQ mapping function in the driver. Use
   of_irq_parse_and_map_pci instead

Ray Jui (4):
  pci: iProc: define Broadcom iProc PCIe binding
  PCI: iproc: Add Broadcom iProc PCIe driver
  ARM: mach-bcm: Enable PCIe support for iProc
  ARM: dts: enable PCIe for Broadcom Cygnus

 .../devicetree/bindings/pci/brcm,iproc-pcie.txt    |   74 ++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   52 ++
 arch/arm/boot/dts/bcm958300k.dts                   |    8 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/pci/host/Kconfig                           |    9 +
 drivers/pci/host/Makefile                          |    1 +
 drivers/pci/host/pcie-iproc.c                      |  888 ++++++++++++++++++++
 7 files changed, 1033 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
 create mode 100644 drivers/pci/host/pcie-iproc.c

-- 
1.7.9.5

[PATCH v2 0/4] Add PCIe support to Broadcom iProc

[Ray Jui]

This patchset contains the initial PCIe support for Broadcom iProc family of
SoCs. This driver has been validated with Cygnus and NSP and is expected to
work on other iProc family of SoCs that deploy the same PCIe controller

Changes from v1:
 - Add standard PCI interrupt DT properties "#interrupt-cells",
   "interrupt-map-mask" and "interrupt-map" so legacy INTx interrupts can be
   supported by using standard PCI OF IRQ parsing function
 - Get rid of custom IRQ mapping function in the driver. Use
   of_irq_parse_and_map_pci instead

Ray Jui (4):
  pci: iProc: define Broadcom iProc PCIe binding
  PCI: iproc: Add Broadcom iProc PCIe driver
  ARM: mach-bcm: Enable PCIe support for iProc
  ARM: dts: enable PCIe for Broadcom Cygnus

 .../devicetree/bindings/pci/brcm,iproc-pcie.txt    |   74 ++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   52 ++
 arch/arm/boot/dts/bcm958300k.dts                   |    8 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/pci/host/Kconfig                           |    9 +
 drivers/pci/host/Makefile                          |    1 +
 drivers/pci/host/pcie-iproc.c                      |  888 ++++++++++++++++++++
 7 files changed, 1033 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
 create mode 100644 drivers/pci/host/pcie-iproc.c

-- 
1.7.9.5

[PATCH v2 0/4] Add PCIe support to Broadcom iProc

[Ray Jui]

This patchset contains the initial PCIe support for Broadcom iProc family of
SoCs. This driver has been validated with Cygnus and NSP and is expected to
work on other iProc family of SoCs that deploy the same PCIe controller

Changes from v1:
 - Add standard PCI interrupt DT properties "#interrupt-cells",
   "interrupt-map-mask" and "interrupt-map" so legacy INTx interrupts can be
   supported by using standard PCI OF IRQ parsing function
 - Get rid of custom IRQ mapping function in the driver. Use
   of_irq_parse_and_map_pci instead

Ray Jui (4):
  pci: iProc: define Broadcom iProc PCIe binding
  PCI: iproc: Add Broadcom iProc PCIe driver
  ARM: mach-bcm: Enable PCIe support for iProc
  ARM: dts: enable PCIe for Broadcom Cygnus

 .../devicetree/bindings/pci/brcm,iproc-pcie.txt    |   74 ++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   52 ++
 arch/arm/boot/dts/bcm958300k.dts                   |    8 +
 arch/arm/mach-bcm/Kconfig                          |    1 +
 drivers/pci/host/Kconfig                           |    9 +
 drivers/pci/host/Makefile                          |    1 +
 drivers/pci/host/pcie-iproc.c                      |  888 ++++++++++++++++++++
 7 files changed, 1033 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
 create mode 100644 drivers/pci/host/pcie-iproc.c

-- 
1.7.9.5

[PATCH v2 1/4] pci: iProc: define Broadcom iProc PCIe binding

[Ray Jui]

Document the PCIe device tree binding for Broadcom iProc family of SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/pci/brcm,iproc-pcie.txt    |   74 ++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt

diff --git a/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
new file mode 100644
index 0000000..040bc0f
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
@@ -0,0 +1,74 @@
+* Broadcom iProc PCIe controller
+
+Required properties:
+- compatible: Must be "brcm,iproc-pcie"
+- reg: base address and length of the PCIe controller and the MDIO interface
+  that controls the PCIe PHY
+- #interrupt-cells: set to <1>
+- interrupts: interrupt IDs
+- interrupt-map-mask and interrupt-map, standard PCI properties to define the
+  mapping of the PCIe interface to interrupt numbers
+- bus-range: PCI bus numbers covered
+- #address-cells: set to <3>
+- #size-cells: set to <2>
+- device_type: set to "pci"
+- ranges: ranges for the PCI memory and I/O regions
+- phy-addr: MDC/MDIO adddress of the PCIe PHY
+- have-msi-inten-reg: Required for legacy iProc PCIe controllers that need the
+  MSI interrupt enable register to be set explicitly
+
+The Broadcom iProc PCie driver adapts the multi-domain structure, i.e., each
+interface has its own domain and therefore has its own device node
+Example:
+
+SoC specific DT Entry:
+
+	pcie0: pcie@18012000 {
+		compatible = "brcm,iproc-pcie";
+		reg = <0x18012000 0x1000>,
+			<0x18002000 0x1000>;
+
+		#interrupt-cells = <1>;
+		interrupts = <GIC_SPI 96 IRQ_TYPE_NONE>,
+			     <GIC_SPI 97 IRQ_TYPE_NONE>,
+			     <GIC_SPI 98 IRQ_TYPE_NONE>,
+			     <GIC_SPI 99 IRQ_TYPE_NONE>,
+			     <GIC_SPI 100 IRQ_TYPE_NONE>,
+			     <GIC_SPI 101 IRQ_TYPE_NONE>;
+		interrupt-map-mask = <0 0 0 0>;
+		interrupt-map = <0 0 0 0 &gic GIC_SPI 100 IRQ_TYPE_NONE>;
+
+		bus-range = <0x00 0xFF>;
+
+		#address-cells = <3>;
+		#size-cells = <2>;
+		device_type = "pci";
+		ranges = <0x81000000 0 0	  0x28000000 0 0x00010000   /* downstream I/O */
+			  0x82000000 0 0x20000000 0x20000000 0 0x04000000>; /* non-prefetchable memory */
+		phy-addr = <5>;
+	};
+
+	pcie1: pcie@18013000 {
+		compatible = "brcm,iproc-pcie";
+		reg = <0x18013000 0x1000>,
+			<0x18002000 0x1000>;
+
+		#interrupt-cells = <1>;
+		interrupts = <GIC_SPI 102 IRQ_TYPE_NONE>,
+			     <GIC_SPI 103 IRQ_TYPE_NONE>,
+			     <GIC_SPI 104 IRQ_TYPE_NONE>,
+			     <GIC_SPI 105 IRQ_TYPE_NONE>,
+			     <GIC_SPI 106 IRQ_TYPE_NONE>,
+			     <GIC_SPI 107 IRQ_TYPE_NONE>;
+		interrupt-map-mask = <0 0 0 0>;
+		interrupt-map = <0 0 0 0 &gic GIC_SPI 106 IRQ_TYPE_NONE>;
+
+		bus-range = <0x00 0xFF>;
+
+		#address-cells = <3>;
+		#size-cells = <2>;
+		device_type = "pci";
+		ranges = <0x81000000 0 0	  0x48000000 0 0x00010000   /* downstream I/O */
+			  0x82000000 0 0x40000000 0x40000000 0 0x04000000>; /* non-prefetchable memory */
+		phy-addr = <6>;
+	};
-- 
1.7.9.5

[PATCH v2 1/4] pci: iProc: define Broadcom iProc PCIe binding

[Ray Jui]

Document the PCIe device tree binding for Broadcom iProc family of SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/pci/brcm,iproc-pcie.txt    |   74 ++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt

diff --git a/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
new file mode 100644
index 0000000..040bc0f
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
@@ -0,0 +1,74 @@
+* Broadcom iProc PCIe controller
+
+Required properties:
+- compatible: Must be "brcm,iproc-pcie"
+- reg: base address and length of the PCIe controller and the MDIO interface
+  that controls the PCIe PHY
+- #interrupt-cells: set to <1>
+- interrupts: interrupt IDs
+- interrupt-map-mask and interrupt-map, standard PCI properties to define the
+  mapping of the PCIe interface to interrupt numbers
+- bus-range: PCI bus numbers covered
+- #address-cells: set to <3>
+- #size-cells: set to <2>
+- device_type: set to "pci"
+- ranges: ranges for the PCI memory and I/O regions
+- phy-addr: MDC/MDIO adddress of the PCIe PHY
+- have-msi-inten-reg: Required for legacy iProc PCIe controllers that need the
+  MSI interrupt enable register to be set explicitly
+
+The Broadcom iProc PCie driver adapts the multi-domain structure, i.e., each
+interface has its own domain and therefore has its own device node
+Example:
+
+SoC specific DT Entry:
+
+	pcie0: pcie@18012000 {
+		compatible = "brcm,iproc-pcie";
+		reg = <0x18012000 0x1000>,
+			<0x18002000 0x1000>;
+
+		#interrupt-cells = <1>;
+		interrupts = <GIC_SPI 96 IRQ_TYPE_NONE>,
+			     <GIC_SPI 97 IRQ_TYPE_NONE>,
+			     <GIC_SPI 98 IRQ_TYPE_NONE>,
+			     <GIC_SPI 99 IRQ_TYPE_NONE>,
+			     <GIC_SPI 100 IRQ_TYPE_NONE>,
+			     <GIC_SPI 101 IRQ_TYPE_NONE>;
+		interrupt-map-mask = <0 0 0 0>;
+		interrupt-map = <0 0 0 0 &gic GIC_SPI 100 IRQ_TYPE_NONE>;
+
+		bus-range = <0x00 0xFF>;
+
+		#address-cells = <3>;
+		#size-cells = <2>;
+		device_type = "pci";
+		ranges = <0x81000000 0 0	  0x28000000 0 0x00010000   /* downstream I/O */
+			  0x82000000 0 0x20000000 0x20000000 0 0x04000000>; /* non-prefetchable memory */
+		phy-addr = <5>;
+	};
+
+	pcie1: pcie@18013000 {
+		compatible = "brcm,iproc-pcie";
+		reg = <0x18013000 0x1000>,
+			<0x18002000 0x1000>;
+
+		#interrupt-cells = <1>;
+		interrupts = <GIC_SPI 102 IRQ_TYPE_NONE>,
+			     <GIC_SPI 103 IRQ_TYPE_NONE>,
+			     <GIC_SPI 104 IRQ_TYPE_NONE>,
+			     <GIC_SPI 105 IRQ_TYPE_NONE>,
+			     <GIC_SPI 106 IRQ_TYPE_NONE>,
+			     <GIC_SPI 107 IRQ_TYPE_NONE>;
+		interrupt-map-mask = <0 0 0 0>;
+		interrupt-map = <0 0 0 0 &gic GIC_SPI 106 IRQ_TYPE_NONE>;
+
+		bus-range = <0x00 0xFF>;
+
+		#address-cells = <3>;
+		#size-cells = <2>;
+		device_type = "pci";
+		ranges = <0x81000000 0 0	  0x48000000 0 0x00010000   /* downstream I/O */
+			  0x82000000 0 0x40000000 0x40000000 0 0x04000000>; /* non-prefetchable memory */
+		phy-addr = <6>;
+	};
-- 
1.7.9.5

[PATCH v2 1/4] pci: iProc: define Broadcom iProc PCIe binding

[Ray Jui]

Document the PCIe device tree binding for Broadcom iProc family of SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/pci/brcm,iproc-pcie.txt    |   74 ++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt

diff --git a/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
new file mode 100644
index 0000000..040bc0f
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
@@ -0,0 +1,74 @@
+* Broadcom iProc PCIe controller
+
+Required properties:
+- compatible: Must be "brcm,iproc-pcie"
+- reg: base address and length of the PCIe controller and the MDIO interface
+  that controls the PCIe PHY
+- #interrupt-cells: set to <1>
+- interrupts: interrupt IDs
+- interrupt-map-mask and interrupt-map, standard PCI properties to define the
+  mapping of the PCIe interface to interrupt numbers
+- bus-range: PCI bus numbers covered
+- #address-cells: set to <3>
+- #size-cells: set to <2>
+- device_type: set to "pci"
+- ranges: ranges for the PCI memory and I/O regions
+- phy-addr: MDC/MDIO adddress of the PCIe PHY
+- have-msi-inten-reg: Required for legacy iProc PCIe controllers that need the
+  MSI interrupt enable register to be set explicitly
+
+The Broadcom iProc PCie driver adapts the multi-domain structure, i.e., each
+interface has its own domain and therefore has its own device node
+Example:
+
+SoC specific DT Entry:
+
+	pcie0: pcie at 18012000 {
+		compatible = "brcm,iproc-pcie";
+		reg = <0x18012000 0x1000>,
+			<0x18002000 0x1000>;
+
+		#interrupt-cells = <1>;
+		interrupts = <GIC_SPI 96 IRQ_TYPE_NONE>,
+			     <GIC_SPI 97 IRQ_TYPE_NONE>,
+			     <GIC_SPI 98 IRQ_TYPE_NONE>,
+			     <GIC_SPI 99 IRQ_TYPE_NONE>,
+			     <GIC_SPI 100 IRQ_TYPE_NONE>,
+			     <GIC_SPI 101 IRQ_TYPE_NONE>;
+		interrupt-map-mask = <0 0 0 0>;
+		interrupt-map = <0 0 0 0 &gic GIC_SPI 100 IRQ_TYPE_NONE>;
+
+		bus-range = <0x00 0xFF>;
+
+		#address-cells = <3>;
+		#size-cells = <2>;
+		device_type = "pci";
+		ranges = <0x81000000 0 0	  0x28000000 0 0x00010000   /* downstream I/O */
+			  0x82000000 0 0x20000000 0x20000000 0 0x04000000>; /* non-prefetchable memory */
+		phy-addr = <5>;
+	};
+
+	pcie1: pcie at 18013000 {
+		compatible = "brcm,iproc-pcie";
+		reg = <0x18013000 0x1000>,
+			<0x18002000 0x1000>;
+
+		#interrupt-cells = <1>;
+		interrupts = <GIC_SPI 102 IRQ_TYPE_NONE>,
+			     <GIC_SPI 103 IRQ_TYPE_NONE>,
+			     <GIC_SPI 104 IRQ_TYPE_NONE>,
+			     <GIC_SPI 105 IRQ_TYPE_NONE>,
+			     <GIC_SPI 106 IRQ_TYPE_NONE>,
+			     <GIC_SPI 107 IRQ_TYPE_NONE>;
+		interrupt-map-mask = <0 0 0 0>;
+		interrupt-map = <0 0 0 0 &gic GIC_SPI 106 IRQ_TYPE_NONE>;
+
+		bus-range = <0x00 0xFF>;
+
+		#address-cells = <3>;
+		#size-cells = <2>;
+		device_type = "pci";
+		ranges = <0x81000000 0 0	  0x48000000 0 0x00010000   /* downstream I/O */
+			  0x82000000 0 0x40000000 0x40000000 0 0x04000000>; /* non-prefetchable memory */
+		phy-addr = <6>;
+	};
-- 
1.7.9.5

[PATCH v2 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Ray Jui]

Add initial version of the Broadcom iProc PCIe driver. This driver
has been tested on NSP and Cygnus and is expected to work on all iProc
family of SoCs that deploys the same PCIe host controller

The driver also supports MSI

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/pci/host/Kconfig      |    9 +
 drivers/pci/host/Makefile     |    1 +
 drivers/pci/host/pcie-iproc.c |  888 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 898 insertions(+)
 create mode 100644 drivers/pci/host/pcie-iproc.c

diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
index c4b6568..22322e1 100644
--- a/drivers/pci/host/Kconfig
+++ b/drivers/pci/host/Kconfig
@@ -102,4 +102,13 @@ config PCI_LAYERSCAPE
 	help
 	  Say Y here if you want PCIe controller support on Layerscape SoCs.
 
+config PCIE_IPROC
+	bool "Broadcom iProc PCIe controller"
+	depends on ARCH_BCM_IPROC
+	help
+	  Say Y here if you want to enable the PCIe controller driver support
+	  on Broadcom's iProc family of SoCs.
+
+	  MSI is also supported in the driver.
+
 endmenu
diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
index 44c2699..1f5e9d2 100644
--- a/drivers/pci/host/Makefile
+++ b/drivers/pci/host/Makefile
@@ -12,3 +12,4 @@ obj-$(CONFIG_PCI_KEYSTONE) += pci-keystone-dw.o pci-keystone.o
 obj-$(CONFIG_PCIE_XILINX) += pcie-xilinx.o
 obj-$(CONFIG_PCI_XGENE) += pci-xgene.o
 obj-$(CONFIG_PCI_LAYERSCAPE) += pci-layerscape.o
+obj-$(CONFIG_PCIE_IPROC) += pcie-iproc.o
diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
new file mode 100644
index 0000000..6f0556b
--- /dev/null
+++ b/drivers/pci/host/pcie-iproc.c
@@ -0,0 +1,888 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/msi.h>
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/mbus.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/of_address.h>
+#include <linux/of_pci.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+
+/* max number of MSI event queues */
+#define MAX_MSI_EQ 6
+#define MAX_IRQS MAX_MSI_EQ
+
+#define MDIO_TIMEOUT_USEC 100
+
+#define OPCODE_WRITE 1
+#define OPCODE_READ  2
+
+#define MII_TA_VAL 2
+#define MII_MDCDIV 62
+
+#define MII_MGMT_CTRL_OFFSET         0x000
+#define MII_MGMT_CTRL_MDCDIV_SHIFT   0
+#define MII_MGMT_CTRL_PRE_SHIFT      7
+#define MII_MGMT_CTRL_BUSY_SHIFT     8
+#define MII_MGMT_CTRL_EXT_SHIFT      9
+#define MII_MGMT_CTRL_BTP_SHIFT      10
+
+#define MII_MGMT_CMD_DATA_OFFSET     0x004
+#define MII_MGMT_CMD_DATA_SHIFT      0
+#define MII_MGMT_CMD_TA_SHIFT        16
+#define MII_MGMT_CMD_RA_SHIFT        18
+#define MII_MGMT_CMD_PA_SHIFT        23
+#define MII_MGMT_CMD_OP_SHIFT        28
+#define MII_MGMT_CMD_SB_SHIFT        30
+#define MII_MGMT_CMD_DATA_MASK       0xFFFF
+
+#define CLK_CONTROL_OFFSET           0x000
+#define EP_PERST_SOURCE_SELECT_SHIFT 2
+#define EP_PERST_SOURCE_SELECT       (1 << EP_PERST_SOURCE_SELECT_SHIFT)
+#define EP_MODE_SURVIVE_PERST_SHIFT  1
+#define EP_MODE_SURVIVE_PERST        (1 << EP_MODE_SURVIVE_PERST_SHIFT)
+#define RC_PCIE_RST_OUTPUT_SHIFT     0
+#define RC_PCIE_RST_OUTPUT           (1 << RC_PCIE_RST_OUTPUT_SHIFT)
+
+#define CFG_IND_ADDR_OFFSET          0x120
+#define CFG_IND_ADDR_MASK            0x00001FFC
+
+#define CFG_IND_DATA_OFFSET          0x124
+
+#define CFG_ADDR_OFFSET              0x1F8
+#define CFG_ADDR_BUS_NUM_SHIFT       20
+#define CFG_ADDR_BUS_NUM_MASK        0x0FF00000
+#define CFG_ADDR_DEV_NUM_SHIFT       15
+#define CFG_ADDR_DEV_NUM_MASK        0x000F8000
+#define CFG_ADDR_FUNC_NUM_SHIFT      12
+#define CFG_ADDR_FUNC_NUM_MASK       0x00007000
+#define CFG_ADDR_REG_NUM_SHIFT       2
+#define CFG_ADDR_REG_NUM_MASK        0x00000FFC
+#define CFG_ADDR_CFG_TYPE_SHIFT      0
+#define CFG_ADDR_CFG_TYPE_MASK       0x00000003
+
+#define CFG_DATA_OFFSET              0x1FC
+
+#define SYS_EQ_PAGE_OFFSET           0x200
+#define SYS_MSI_PAGE_OFFSET          0x204
+
+#define SYS_MSI_INTS_EN_OFFSET       0x208
+
+#define SYS_MSI_CTRL_0_OFFSET        0x210
+#define SYS_MSI_INTR_EN_SHIFT        11
+#define SYS_MSI_INTR_EN              (1 << SYS_MSI_INTR_EN_SHIFT)
+#define SYS_MSI_INT_N_EVENT_SHIFT    1
+#define SYS_MSI_INT_N_EVENT          (1 << SYS_MSI_INT_N_EVENT_SHIFT)
+#define SYS_MSI_EQ_EN_SHIFT          0
+#define SYS_MSI_EQ_EN                (1 << SYS_MSI_EQ_EN_SHIFT)
+
+#define SYS_EQ_HEAD_0_OFFSET         0x250
+#define SYS_EQ_TAIL_0_OFFSET         0x254
+#define SYS_EQ_TAIL_0_MASK           0x3F
+
+#define SYS_RC_INTX_EN               0x330
+#define SYS_RC_INTX_MASK             0xF
+
+#define SYS_RC_INTX_CSR              0x334
+#define SYS_RC_INTX_MASK             0xF
+
+#define OARR_0_OFFSET                0xD20
+#define OAAR_0_ADDR_MASK             0xF0000000
+#define OAAR_0_VALID_SHIFT           0
+#define OAAR_0_VALID                 (1 << OAAR_0_VALID_SHIFT)
+#define OAAR_0_UPPER_OFFSET          0xD24
+#define OAAR_0_UPPER_ADDR_MASK       0x0000000F
+
+#define PCIE_SYS_RC_INTX_EN_OFFSET   0x330
+
+#define OMAP_0_LOWER_OFFSET          0xD40
+#define OMAP_0_LOWER_ADDR_MASK       0xF0000000
+#define OMAP_0_UPPER_OFFSET          0x0D44
+
+#define PCIE_LINK_STATUS_OFFSET      0xF0C
+#define PCIE_PHYLINKUP_SHITF         3
+#define PCIE_PHYLINKUP               (1 << PCIE_PHYLINKUP_SHITF)
+
+#define STRAP_STATUS_OFFSET          0xF10
+#define STRAP_1LANE_SHIFT            2
+#define STRAP_1LANE                  (1 << STRAP_1LANE_SHIFT)
+#define STRAP_IF_ENABLE_SHIFT        1
+#define STRAP_IF_ENABLE              (1 << STRAP_IF_ENABLE_SHIFT)
+#define STRAP_RC_MODE_SHIFT          0
+#define STRAP_RC_MODE                (1 << STRAP_RC_MODE_SHIFT)
+
+struct iproc_pcie;
+
+/**
+ * iProc MSI
+ * @pcie: pointer to the iProc PCIe data structure
+ * @irq_in_use: bitmap of MSI IRQs that are in use
+ * @domain: MSI IRQ domain
+ * @chip: MSI controller
+ * @eq_page: memory page to store the iProc MSI event queue
+ * @msi_page: memory page for MSI posted writes
+ */
+struct iproc_msi {
+	struct iproc_pcie *pcie;
+	DECLARE_BITMAP(irq_in_use, MAX_IRQS);
+	struct irq_domain *domain;
+	struct msi_controller chip;
+	unsigned long eq_page;
+	unsigned long msi_page;
+};
+
+/**
+ * iProc PCIe
+ * @dev: pointer to the device
+ * @mii: MII/MDIO management I/O register base
+ * @reg: PCIe I/O register base
+ * @io: PCIe I/O resource
+ * @mem: PCIe memory resource
+ * @busn: PCIe bus resource
+ * @phy_addr: MIDO PHY address
+ * @irqs: Array that stores IRQs
+ * @msi: MSI related info
+ */
+struct iproc_pcie {
+	struct device *dev;
+
+	void __iomem *mii;
+	void __iomem *reg;
+
+	struct resource io;
+	struct resource mem;
+	struct resource busn;
+
+	u32 phy_addr;
+	int irqs[MAX_IRQS];
+
+	struct iproc_msi msi;
+};
+
+static inline int mdio_wait_idle(struct iproc_pcie *pcie)
+{
+	int timeout = MDIO_TIMEOUT_USEC;
+
+	while (readl(pcie->mii + MII_MGMT_CTRL_OFFSET) &
+			(1 << MII_MGMT_CTRL_BUSY_SHIFT)) {
+		udelay(1);
+		if (timeout-- <= 0)
+			return -EBUSY;
+	}
+	return 0;
+}
+
+static void mdio_init(struct iproc_pcie *pcie)
+{
+	u32 val;
+
+	val = MII_MDCDIV << MII_MGMT_CTRL_MDCDIV_SHIFT;
+	val |= (1 << MII_MGMT_CTRL_PRE_SHIFT);
+	writel(val, pcie->mii + MII_MGMT_CTRL_OFFSET);
+
+	WARN_ON(mdio_wait_idle(pcie));
+}
+
+static u16 mdio_read(struct iproc_pcie *pcie, unsigned int phy_addr,
+		unsigned int reg_addr)
+{
+	u32 val;
+
+	WARN_ON(mdio_wait_idle(pcie));
+
+	val = (MII_TA_VAL << MII_MGMT_CMD_TA_SHIFT);
+	val |= (reg_addr << MII_MGMT_CMD_RA_SHIFT);
+	val |= (phy_addr << MII_MGMT_CMD_PA_SHIFT);
+	val |= (OPCODE_READ << MII_MGMT_CMD_OP_SHIFT);
+	val |= (1 << MII_MGMT_CMD_SB_SHIFT);
+	writel(val, pcie->mii + MII_MGMT_CMD_DATA_OFFSET);
+
+	WARN_ON(mdio_wait_idle(pcie));
+
+	val = readl(pcie->mii + MII_MGMT_CMD_DATA_OFFSET) &
+		MII_MGMT_CMD_DATA_MASK;
+
+	return (u16)val;
+}
+
+static void mdio_write(struct iproc_pcie *pcie, unsigned int phy_addr,
+		unsigned int reg_addr, u16 wr_data)
+{
+	u32 val;
+
+	WARN_ON(mdio_wait_idle(pcie));
+
+	val = (MII_TA_VAL << MII_MGMT_CMD_TA_SHIFT);
+	val |= (reg_addr << MII_MGMT_CMD_RA_SHIFT);
+	val |= (phy_addr << MII_MGMT_CMD_PA_SHIFT);
+	val |= (OPCODE_WRITE << MII_MGMT_CMD_OP_SHIFT);
+	val |= (1 << MII_MGMT_CMD_SB_SHIFT);
+	val |= ((u32)wr_data & MII_MGMT_CMD_DATA_MASK);
+	writel(val, pcie->mii + MII_MGMT_CMD_DATA_OFFSET);
+
+	WARN_ON(mdio_wait_idle(pcie));
+}
+
+#define PCIE_PHY_BLK_ADDR_OFFSET 0x1F
+#define PCIE_PHY_BLK_ADDR_MASK   0xFFF0
+#define PCIE_PHY_REG_ADDR_MASK   0xF
+static u16 iproc_pcie_phy_reg_read(struct iproc_pcie *pcie,
+		unsigned int phy_addr, unsigned int reg_addr)
+{
+	u16 val;
+
+	mdio_write(pcie, phy_addr, PCIE_PHY_BLK_ADDR_OFFSET,
+			reg_addr & PCIE_PHY_BLK_ADDR_MASK);
+	val = mdio_read(pcie, phy_addr, reg_addr & PCIE_PHY_REG_ADDR_MASK);
+
+	dev_dbg(pcie->dev, "phy rd: phy: 0x%0x reg: 0x%4x data: 0x%4x\n",
+			phy_addr, reg_addr, val);
+
+	return val;
+}
+
+static void iproc_pcie_phy_reg_write(struct iproc_pcie *pcie,
+		unsigned int phy_addr, unsigned int reg_addr, u16 val)
+{
+	mdio_write(pcie, phy_addr, PCIE_PHY_BLK_ADDR_OFFSET,
+			reg_addr & PCIE_PHY_BLK_ADDR_MASK);
+	mdio_write(pcie, phy_addr, reg_addr & PCIE_PHY_REG_ADDR_MASK, val);
+
+	dev_dbg(pcie->dev, "phy wr: phy: 0x%0x reg: 0x%4x data: 0x%4x\n",
+			phy_addr, reg_addr, val);
+}
+
+static inline struct iproc_pcie *sys_to_pcie(struct pci_sys_data *sys)
+{
+	return sys->private_data;
+}
+
+static void iproc_pcie_reset(struct iproc_pcie *pcie)
+{
+	u32 val;
+
+	/* send a downstream reset */
+	val = EP_MODE_SURVIVE_PERST | RC_PCIE_RST_OUTPUT;
+	writel(val, pcie->reg + CLK_CONTROL_OFFSET);
+	udelay(250);
+	val &= ~EP_MODE_SURVIVE_PERST;
+	writel(val, pcie->reg + CLK_CONTROL_OFFSET);
+	mdelay(250);
+}
+
+#define INVALID_ACCESS_OFFSET 0xFFFFFFFF
+static u32 iproc_pcie_conf_access(struct iproc_pcie *pcie, struct pci_bus *bus,
+		unsigned int devfn, int where)
+{
+	int busno = bus->number;
+	int slot = PCI_SLOT(devfn);
+	int fn = PCI_FUNC(devfn);
+	u32 val;
+
+	/* root complex access */
+	if (busno == 0) {
+		if (slot)
+			return INVALID_ACCESS_OFFSET;
+		writel(where & CFG_IND_ADDR_MASK,
+				pcie->reg + CFG_IND_ADDR_OFFSET);
+		return CFG_IND_DATA_OFFSET;
+	}
+
+	if (fn > 1)
+		return INVALID_ACCESS_OFFSET;
+
+	/* access of EP device */
+	val = (bus->number << CFG_ADDR_BUS_NUM_SHIFT) |
+		(PCI_SLOT(devfn) << CFG_ADDR_DEV_NUM_SHIFT) |
+		(PCI_FUNC(devfn) << CFG_ADDR_FUNC_NUM_SHIFT) |
+		(where & CFG_ADDR_REG_NUM_MASK) |
+		(1 & CFG_ADDR_CFG_TYPE_MASK);
+	writel(val, pcie->reg + CFG_ADDR_OFFSET);
+
+	return CFG_DATA_OFFSET;
+}
+
+#define INVALID_CFG_RD 0xFFFFFFFF
+static int iproc_pci_read_conf(struct pci_bus *bus, unsigned int devfn,
+		int where, int size, u32 *val)
+{
+	u32 offset;
+	struct iproc_pcie *pcie = sys_to_pcie(bus->sysdata);
+
+	*val = INVALID_CFG_RD;
+
+	if (size != 1 && size != 2 && size != 4)
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+	else if ((size == 2) && (where & 1))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+	else if ((size == 4) && (where & 3))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	offset = iproc_pcie_conf_access(pcie, bus, devfn, where);
+	if (offset == INVALID_ACCESS_OFFSET)
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	*val = readl(pcie->reg + offset);
+
+	switch (size) {
+	case 4:
+		/* return raw data */
+		break;
+	case 2:
+		*val = (*val >> (8 * (where & 3))) & 0xFFFF;
+		break;
+	case 1:
+		*val = (*val >> (8 * (where & 3))) & 0xFF;
+		break;
+	default:
+		BUG_ON(1);
+	}
+
+	dev_dbg(pcie->dev, "conf rd: busn=%d devfn=%d where=%d size=%d val=0x%08x\n",
+			bus->number, devfn, where, size, *val);
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int iproc_pci_write_conf(struct pci_bus *bus, unsigned int devfn,
+		int where, int size, u32 val)
+{
+	int shift;
+	u32 offset, data;
+	struct iproc_pcie *pcie = sys_to_pcie(bus->sysdata);
+
+	if (size != 1 && size != 2 && size != 4)
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+	else if ((size == 2) && (where & 1))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+	else if ((size == 4) && (where & 3))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	offset = iproc_pcie_conf_access(pcie, bus, devfn, where);
+	if (offset == INVALID_ACCESS_OFFSET)
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	data = readl(pcie->reg + offset);
+
+	switch (size) {
+	case 4:
+		data = val;
+		break;
+	case 2:
+		shift = 8 * (where & 2);
+		data &= ~(0xFFFF << shift);
+		data |= ((val & 0xFFFF) << shift);
+		break;
+	case 1:
+		shift = 8 * (where & 3);
+		data &= ~(0xFF << shift);
+		data |= ((val & 0xFF) << shift);
+		break;
+	default:
+		BUG_ON(1);
+	}
+
+	writel(data, pcie->reg + offset);
+
+	dev_dbg(pcie->dev,
+		"config wr: busn=%d devfn=%d where=%d size=%d data=0x%08x\n",
+		bus->number, devfn, where, size, data);
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static struct pci_ops iproc_pcie_ops = {
+	.read = iproc_pci_read_conf,
+	.write = iproc_pci_write_conf,
+};
+
+static int iproc_pcie_check_link(struct iproc_pcie *pcie)
+{
+	int ret;
+	u8 nlw;
+	u16 pos, tmp16;
+	u32 val;
+	struct pci_sys_data sys;
+	struct pci_bus bus;
+
+	val = readl(pcie->reg + PCIE_LINK_STATUS_OFFSET);
+	dev_dbg(pcie->dev, "link status: 0x%08x\n", val);
+
+	val = readl(pcie->reg + STRAP_STATUS_OFFSET);
+	dev_dbg(pcie->dev, "strap status: 0x%08x\n", val);
+
+	memset(&sys, 0, sizeof(sys));
+	memset(&bus, 0, sizeof(bus));
+
+	bus.number = 0;
+	bus.ops = &iproc_pcie_ops;
+	bus.sysdata = &sys;
+	sys.private_data = pcie;
+
+	ret = iproc_pci_read_conf(&bus, 0, PCI_HEADER_TYPE, 1, &val);
+	if (ret != PCIBIOS_SUCCESSFUL || val != PCI_HEADER_TYPE_BRIDGE) {
+		dev_err(pcie->dev, "in EP mode, val=0x08%x\n", val);
+		return -EFAULT;
+	}
+
+	/*
+	 * Under RC mode, write to function specific register 0x43c, to change
+	 * the CLASS code in configuration space
+	 *
+	 * After this modification, the CLASS code in configuration space would
+	 * be read as PCI_CLASS_BRIDGE_PCI(0x0604)
+	 */
+#define PCI_BRIDGE_CTRL_REG_OFFSET 0x43C
+#define PCI_CLASS_BRIDGE_PCI_MASK  0xFF0000FF
+	pci_bus_read_config_dword(&bus, 0, PCI_BRIDGE_CTRL_REG_OFFSET, &val);
+	val = (val & PCI_CLASS_BRIDGE_PCI_MASK) | (PCI_CLASS_BRIDGE_PCI << 8);
+	pci_bus_write_config_dword(&bus, 0, PCI_BRIDGE_CTRL_REG_OFFSET, val);
+
+	/* check link status to see if link is active */
+	pos = pci_bus_find_capability(&bus, 0, PCI_CAP_ID_EXP);
+	pci_bus_read_config_word(&bus, 0, pos + PCI_EXP_LNKSTA, &tmp16);
+	tmp16 &= PCI_EXP_LNKSTA_DLLLA;
+	nlw = (tmp16 & PCI_EXP_LNKSTA_NLW) >> PCI_EXP_LNKSTA_NLW_SHIFT;
+
+	if (nlw == 0) {
+		/* try GEN 1 link speed */
+#define PCI_LINK_STATUS_CTRL_2_OFFSET 0xDC
+#define PCI_TARGET_LINK_SPEED_MASK    0xF
+#define PCI_TARGET_LINK_SPEED_GEN2    0x2
+#define PCI_TARGET_LINK_SPEED_GEN1    0x1
+		pci_bus_read_config_dword(&bus, 0,
+				PCI_LINK_STATUS_CTRL_2_OFFSET, &val);
+		if ((val & PCI_TARGET_LINK_SPEED_MASK) ==
+				PCI_TARGET_LINK_SPEED_GEN2) {
+			val &= ~PCI_TARGET_LINK_SPEED_MASK;
+			val |= PCI_TARGET_LINK_SPEED_GEN1;
+			pci_bus_write_config_dword(&bus, 0,
+					PCI_LINK_STATUS_CTRL_2_OFFSET, val);
+			pci_bus_read_config_dword(&bus, 0,
+					PCI_LINK_STATUS_CTRL_2_OFFSET, &val);
+			mdelay(100);
+
+			pos = pci_bus_find_capability(&bus, 0, PCI_CAP_ID_EXP);
+			pci_bus_read_config_word(&bus, 0, pos + PCI_EXP_LNKSTA,
+					&tmp16);
+			nlw = (tmp16 & PCI_EXP_LNKSTA_NLW) >>
+				PCI_EXP_LNKSTA_NLW_SHIFT;
+		}
+	}
+
+	dev_info(pcie->dev, "link: %s\n", nlw ? "UP" : "DOWN");
+
+	return nlw ? 0 : -ENODEV;
+}
+
+static int iproc_pcie_setup(int nr, struct pci_sys_data *sys)
+{
+	struct iproc_pcie *pcie = sys_to_pcie(sys);
+
+	pci_add_resource(&sys->resources, &pcie->io);
+	pci_add_resource(&sys->resources, &pcie->mem);
+	pci_add_resource(&sys->resources, &pcie->busn);
+
+	return 1;
+}
+
+static struct pci_bus *iproc_pcie_scan_bus(int nr, struct pci_sys_data *sys)
+{
+	struct iproc_pcie *pcie = sys->private_data;
+	struct pci_bus *bus;
+
+	bus = pci_create_root_bus(pcie->dev, sys->busnr, &iproc_pcie_ops, sys,
+			&sys->resources);
+	if (!bus)
+		return NULL;
+
+	if (IS_ENABLED(CONFIG_PCI_MSI))
+		bus->msi = &pcie->msi.chip;
+
+	pci_scan_child_bus(bus);
+
+	return bus;
+}
+
+static struct hw_pci hw;
+
+static void iproc_pcie_enable(struct iproc_pcie *pcie)
+{
+	hw.nr_controllers = 1;
+	hw.private_data = (void **)&pcie;
+	hw.setup = iproc_pcie_setup;
+	hw.scan = iproc_pcie_scan_bus;
+	hw.map_irq = of_irq_parse_and_map_pci;
+	hw.ops = &iproc_pcie_ops;
+
+	/* enable root complex INTX */
+	writel(SYS_RC_INTX_MASK, pcie->reg + SYS_RC_INTX_EN);
+
+	pci_common_init_dev(pcie->dev, &hw);
+#ifdef CONFIG_PCI_DOMAINS
+	hw.domain++;
+#endif
+}
+
+#define PCIE_PHY_REG_ADDR 0x2103
+#define PCIE_PHY_DATA     0x2B1C
+static void iproc_pcie_mii_phy_init(struct iproc_pcie *pcie, u32 phy_addr)
+{
+	unsigned int reg_addr;
+	u16 val;
+
+	mdio_init(pcie);
+
+	reg_addr = PCIE_PHY_REG_ADDR;
+	val = PCIE_PHY_DATA;
+	iproc_pcie_phy_reg_write(pcie, phy_addr, reg_addr, val);
+	val = iproc_pcie_phy_reg_read(pcie, phy_addr, reg_addr);
+	dev_info(pcie->dev, "phy: 0x%x reg: 0x%4x val: 0x%4x\n", phy_addr,
+			reg_addr, val);
+}
+
+static inline struct iproc_msi *to_iproc_msi(struct msi_controller *chip)
+{
+	return container_of(chip, struct iproc_msi, chip);
+}
+
+static int iproc_msi_irq_assign(struct iproc_msi *chip)
+{
+	int msi;
+
+	msi = find_first_zero_bit(chip->irq_in_use, MAX_IRQS);
+	if (msi < MAX_IRQS)
+		set_bit(msi, chip->irq_in_use);
+	else
+		msi = -ENOSPC;
+
+	return msi;
+}
+
+static void iproc_msi_irq_free(struct iproc_msi *chip, unsigned long irq)
+{
+	clear_bit(irq, chip->irq_in_use);
+}
+
+static int iproc_msi_setup_irq(struct msi_controller *chip,
+		struct pci_dev *pdev, struct msi_desc *desc)
+{
+	struct iproc_msi *msi = to_iproc_msi(chip);
+	struct iproc_pcie *pcie = msi->pcie;
+	struct msi_msg msg;
+	unsigned int irq;
+	int hwirq;
+
+	hwirq = iproc_msi_irq_assign(msi);
+	if (hwirq < 0)
+		return hwirq;
+
+	irq = irq_create_mapping(msi->domain, hwirq);
+	if (!irq) {
+		iproc_msi_irq_free(msi, hwirq);
+		return -EINVAL;
+	}
+
+	dev_dbg(pcie->dev, "mapped irq:%d\n", irq);
+
+	irq_set_msi_desc(irq, desc);
+
+	msg.address_lo = virt_to_phys((void *)msi->msi_page) | (hwirq * 4);
+	msg.address_hi = 0x0;
+	msg.data = hwirq;
+
+	write_msi_msg(irq, &msg);
+
+	return 0;
+}
+
+static void iproc_msi_teardown_irq(struct msi_controller *chip,
+		unsigned int irq)
+{
+	struct iproc_msi *msi = to_iproc_msi(chip);
+	struct irq_data *data = irq_get_irq_data(irq);
+
+	iproc_msi_irq_free(msi, data->hwirq);
+}
+
+static struct irq_chip iproc_msi_irq_chip = {
+	.name = "iProc PCIe MSI",
+	.irq_enable = unmask_msi_irq,
+	.irq_disable = mask_msi_irq,
+	.irq_mask = mask_msi_irq,
+	.irq_unmask = unmask_msi_irq,
+};
+
+static int iproc_msi_map(struct irq_domain *domain, unsigned int irq,
+			irq_hw_number_t hwirq)
+{
+	irq_set_chip_and_handler(irq, &iproc_msi_irq_chip, handle_simple_irq);
+	irq_set_chip_data(irq, domain->host_data);
+	set_irq_flags(irq, IRQF_VALID);
+
+	return 0;
+}
+
+static const struct irq_domain_ops iproc_msi_domain_ops = {
+	.map = iproc_msi_map,
+};
+
+static irqreturn_t iproc_msi_irq(int irq, void *data)
+{
+	struct iproc_pcie *pcie = data;
+	unsigned int eq, head, tail, num_events;
+
+	/* Do not handle INTx interrupt */
+	if ((readl(pcie->reg + SYS_RC_INTX_CSR) & SYS_RC_INTX_MASK) != 0)
+		return IRQ_NONE;
+
+	eq = irq - pcie->irqs[0];
+	BUG_ON(eq >= MAX_MSI_EQ);
+
+	irq = irq_find_mapping(pcie->msi.domain, eq);
+	head = readl(pcie->reg + SYS_EQ_HEAD_0_OFFSET + (eq * 8));
+	do {
+		tail = readl(pcie->reg + SYS_EQ_TAIL_0_OFFSET + (eq * 8));
+		tail &= SYS_EQ_TAIL_0_MASK;
+
+		num_events = (tail < head) ?
+			(64 + (tail - head)) : (tail - head);
+		if (!num_events)
+			break;
+
+		generic_handle_irq(irq);
+
+		head++;
+		head %= 64;
+		writel(head, pcie->reg + SYS_EQ_HEAD_0_OFFSET + (eq * 8));
+	} while (true);
+
+	return IRQ_HANDLED;
+}
+
+static int iproc_pcie_enable_msi(struct iproc_pcie *pcie)
+{
+	struct iproc_msi *msi = &pcie->msi;
+	struct device_node *np = pcie->dev->of_node;
+	int i, ret;
+	u32 val;
+
+	msi->pcie = pcie;
+	msi->chip.dev = pcie->dev;
+	msi->chip.setup_irq = iproc_msi_setup_irq;
+	msi->chip.teardown_irq = iproc_msi_teardown_irq;
+
+	msi->domain = irq_domain_add_linear(pcie->dev->of_node, MAX_IRQS,
+			&iproc_msi_domain_ops, &msi->chip);
+	if (!msi->domain) {
+		dev_err(pcie->dev, "failed to create IRQ domain\n");
+		return -ENOMEM;
+	}
+
+	for (i = 0; i < MAX_IRQS; i++) {
+		ret = devm_request_irq(pcie->dev, pcie->irqs[i],
+			iproc_msi_irq, IRQF_SHARED, "iproc-pcie", pcie);
+		if (ret < 0) {
+			dev_err(pcie->dev, "failed to request IRQ: %d\n",
+					pcie->irqs[i]);
+			goto err_rm_irq_domain;
+		}
+	}
+
+	msi->eq_page = __get_free_pages(GFP_KERNEL, 0);
+	if (!msi->eq_page) {
+		dev_err(pcie->dev,
+			"failed to allocate memory for MSI event queue\n");
+		ret = -ENOMEM;
+		goto err_rm_irq_domain;
+	}
+
+	msi->msi_page = __get_free_pages(GFP_KERNEL, 0);
+	if (!msi->msi_page) {
+		dev_err(pcie->dev,
+			"failed to allocate memory for MSI\n");
+		ret = -ENOMEM;
+		goto err_free_msi_eq_page;
+	}
+
+	writel(virt_to_phys((void *)msi->eq_page),
+			pcie->reg + SYS_EQ_PAGE_OFFSET);
+	writel(virt_to_phys((void *)msi->msi_page),
+			pcie->reg + SYS_MSI_PAGE_OFFSET);
+
+	for (i = 0; i < MAX_MSI_EQ; i++) {
+		/* enable MSI event queue and interrupt */
+		val = SYS_MSI_INTR_EN | SYS_MSI_INT_N_EVENT | SYS_MSI_EQ_EN;
+		writel(val, pcie->reg + SYS_MSI_CTRL_0_OFFSET + (i * 4));
+		/*
+		 * To support legacy platforms that require the MSI interrupt
+		 * enable register to be set explicitly
+		 */
+		if (of_find_property(np, "have-msi-inten-reg", NULL)) {
+			val = readl(pcie->reg + SYS_MSI_INTS_EN_OFFSET);
+			val |= (1 << i);
+			writel(val, pcie->reg + SYS_MSI_INTS_EN_OFFSET);
+		}
+	}
+
+	dev_info(pcie->dev, "MSI enabled\n");
+	return 0;
+
+err_free_msi_eq_page:
+	free_pages(msi->eq_page, 0);
+
+err_rm_irq_domain:
+	irq_domain_remove(msi->domain);
+	return ret;
+}
+
+static int __init iproc_pcie_probe(struct platform_device *pdev)
+{
+	struct iproc_pcie *pcie;
+	struct device_node *np = pdev->dev.of_node;
+	struct of_pci_range range;
+	struct of_pci_range_parser parser;
+	struct resource res, regs;
+	int i, ret;
+
+	pcie = devm_kzalloc(&pdev->dev, sizeof(struct iproc_pcie),
+			    GFP_KERNEL);
+	if (!pcie)
+		return -ENOMEM;
+
+	pcie->dev = &pdev->dev;
+	platform_set_drvdata(pdev, pcie);
+
+	if (of_pci_parse_bus_range(pdev->dev.of_node, &pcie->busn)) {
+		dev_err(&pdev->dev, "failed to parse bus-range property\n");
+		return -EINVAL;
+	}
+
+	/* PCIE controller registers */
+	ret = of_address_to_resource(np, 0, &regs);
+	if (ret) {
+		dev_err(pcie->dev, "unable to obtain device resources\n");
+		return -ENODEV;
+	}
+
+	pcie->reg = devm_ioremap(pcie->dev, regs.start, resource_size(&regs));
+	if (!pcie->reg) {
+		dev_err(pcie->dev, "unable to map device reg resources\n");
+		return -ENOMEM;
+	}
+
+	/* MDIO registers */
+	ret = of_address_to_resource(np, 1, &regs);
+	if (ret) {
+		dev_err(pcie->dev, "unable to obtain device resources\n");
+		return -ENODEV;
+	}
+
+	pcie->mii = devm_ioremap(pcie->dev, regs.start, resource_size(&regs));
+	if (!pcie->mii) {
+		dev_err(pcie->dev, "unable to map device mii resources\n");
+		return -ENOMEM;
+	}
+
+	for (i = 0; i < MAX_IRQS; i++) {
+		pcie->irqs[i] = irq_of_parse_and_map(np, i);
+		if (!pcie->irqs[i]) {
+			dev_err(pcie->dev, "unable to parse irq index:%d\n", i);
+			return -ENODEV;
+		}
+	}
+
+	if (of_property_read_u32(np, "phy-addr", &pcie->phy_addr)) {
+		dev_err(pcie->dev, "missing \"phy-addr\" property in DT\n");
+		return -EINVAL;
+	}
+
+	if (of_pci_range_parser_init(&parser, np)) {
+		dev_err(pcie->dev, "missing \"ranges\" property in DT\n");
+		return -EINVAL;
+	}
+
+	/* Get the PCI memory ranges from DT */
+	for_each_of_pci_range(&parser, &range) {
+		of_pci_range_to_resource(&range, np, &res);
+
+		switch (res.flags & IORESOURCE_TYPE_BITS) {
+		case IORESOURCE_IO:
+			memcpy(&pcie->io, &res, sizeof(res));
+			pcie->io.name = "I/O";
+			break;
+
+		case IORESOURCE_MEM:
+			memcpy(&pcie->mem, &res, sizeof(res));
+			pcie->mem.name = "MEM";
+			break;
+		}
+	}
+
+	if (IS_ENABLED(CONFIG_PCI_MSI)) {
+		ret = iproc_pcie_enable_msi(pcie);
+		if (ret < 0) {
+			dev_err(pcie->dev, "failed to enable MSI support\n");
+			return ret;
+		}
+	}
+
+	iproc_pcie_mii_phy_init(pcie, pcie->phy_addr);
+
+	iproc_pcie_reset(pcie);
+
+	ret = iproc_pcie_check_link(pcie);
+	if (ret) {
+		dev_err(pcie->dev, "no PCIe EP device detected\n");
+		return ret;
+	}
+
+	iproc_pcie_enable(pcie);
+	pci_assign_unassigned_resources();
+
+	return 0;
+}
+
+static const struct of_device_id iproc_pcie_of_match_table[] = {
+	{ .compatible = "brcm,iproc-pcie", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, iproc_pcie_of_match_table);
+
+static struct platform_driver iproc_pcie_driver = {
+	.driver = {
+		.owner = THIS_MODULE,
+		.name = "iproc-pcie",
+		.of_match_table =
+		   of_match_ptr(iproc_pcie_of_match_table),
+	},
+};
+
+static int __init iproc_pcie_init(void)
+{
+	return platform_driver_probe(&iproc_pcie_driver,
+			iproc_pcie_probe);
+}
+subsys_initcall(iproc_pcie_init);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom iPROC PCIe driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v2 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Ray Jui]

Add initial version of the Broadcom iProc PCIe driver. This driver
has been tested on NSP and Cygnus and is expected to work on all iProc
family of SoCs that deploys the same PCIe host controller

The driver also supports MSI

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/pci/host/Kconfig      |    9 +
 drivers/pci/host/Makefile     |    1 +
 drivers/pci/host/pcie-iproc.c |  888 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 898 insertions(+)
 create mode 100644 drivers/pci/host/pcie-iproc.c

diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
index c4b6568..22322e1 100644
--- a/drivers/pci/host/Kconfig
+++ b/drivers/pci/host/Kconfig
@@ -102,4 +102,13 @@ config PCI_LAYERSCAPE
 	help
 	  Say Y here if you want PCIe controller support on Layerscape SoCs.
 
+config PCIE_IPROC
+	bool "Broadcom iProc PCIe controller"
+	depends on ARCH_BCM_IPROC
+	help
+	  Say Y here if you want to enable the PCIe controller driver support
+	  on Broadcom's iProc family of SoCs.
+
+	  MSI is also supported in the driver.
+
 endmenu
diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
index 44c2699..1f5e9d2 100644
--- a/drivers/pci/host/Makefile
+++ b/drivers/pci/host/Makefile
@@ -12,3 +12,4 @@ obj-$(CONFIG_PCI_KEYSTONE) += pci-keystone-dw.o pci-keystone.o
 obj-$(CONFIG_PCIE_XILINX) += pcie-xilinx.o
 obj-$(CONFIG_PCI_XGENE) += pci-xgene.o
 obj-$(CONFIG_PCI_LAYERSCAPE) += pci-layerscape.o
+obj-$(CONFIG_PCIE_IPROC) += pcie-iproc.o
diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
new file mode 100644
index 0000000..6f0556b
--- /dev/null
+++ b/drivers/pci/host/pcie-iproc.c
@@ -0,0 +1,888 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/msi.h>
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/mbus.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/of_address.h>
+#include <linux/of_pci.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+
+/* max number of MSI event queues */
+#define MAX_MSI_EQ 6
+#define MAX_IRQS MAX_MSI_EQ
+
+#define MDIO_TIMEOUT_USEC 100
+
+#define OPCODE_WRITE 1
+#define OPCODE_READ  2
+
+#define MII_TA_VAL 2
+#define MII_MDCDIV 62
+
+#define MII_MGMT_CTRL_OFFSET         0x000
+#define MII_MGMT_CTRL_MDCDIV_SHIFT   0
+#define MII_MGMT_CTRL_PRE_SHIFT      7
+#define MII_MGMT_CTRL_BUSY_SHIFT     8
+#define MII_MGMT_CTRL_EXT_SHIFT      9
+#define MII_MGMT_CTRL_BTP_SHIFT      10
+
+#define MII_MGMT_CMD_DATA_OFFSET     0x004
+#define MII_MGMT_CMD_DATA_SHIFT      0
+#define MII_MGMT_CMD_TA_SHIFT        16
+#define MII_MGMT_CMD_RA_SHIFT        18
+#define MII_MGMT_CMD_PA_SHIFT        23
+#define MII_MGMT_CMD_OP_SHIFT        28
+#define MII_MGMT_CMD_SB_SHIFT        30
+#define MII_MGMT_CMD_DATA_MASK       0xFFFF
+
+#define CLK_CONTROL_OFFSET           0x000
+#define EP_PERST_SOURCE_SELECT_SHIFT 2
+#define EP_PERST_SOURCE_SELECT       (1 << EP_PERST_SOURCE_SELECT_SHIFT)
+#define EP_MODE_SURVIVE_PERST_SHIFT  1
+#define EP_MODE_SURVIVE_PERST        (1 << EP_MODE_SURVIVE_PERST_SHIFT)
+#define RC_PCIE_RST_OUTPUT_SHIFT     0
+#define RC_PCIE_RST_OUTPUT           (1 << RC_PCIE_RST_OUTPUT_SHIFT)
+
+#define CFG_IND_ADDR_OFFSET          0x120
+#define CFG_IND_ADDR_MASK            0x00001FFC
+
+#define CFG_IND_DATA_OFFSET          0x124
+
+#define CFG_ADDR_OFFSET              0x1F8
+#define CFG_ADDR_BUS_NUM_SHIFT       20
+#define CFG_ADDR_BUS_NUM_MASK        0x0FF00000
+#define CFG_ADDR_DEV_NUM_SHIFT       15
+#define CFG_ADDR_DEV_NUM_MASK        0x000F8000
+#define CFG_ADDR_FUNC_NUM_SHIFT      12
+#define CFG_ADDR_FUNC_NUM_MASK       0x00007000
+#define CFG_ADDR_REG_NUM_SHIFT       2
+#define CFG_ADDR_REG_NUM_MASK        0x00000FFC
+#define CFG_ADDR_CFG_TYPE_SHIFT      0
+#define CFG_ADDR_CFG_TYPE_MASK       0x00000003
+
+#define CFG_DATA_OFFSET              0x1FC
+
+#define SYS_EQ_PAGE_OFFSET           0x200
+#define SYS_MSI_PAGE_OFFSET          0x204
+
+#define SYS_MSI_INTS_EN_OFFSET       0x208
+
+#define SYS_MSI_CTRL_0_OFFSET        0x210
+#define SYS_MSI_INTR_EN_SHIFT        11
+#define SYS_MSI_INTR_EN              (1 << SYS_MSI_INTR_EN_SHIFT)
+#define SYS_MSI_INT_N_EVENT_SHIFT    1
+#define SYS_MSI_INT_N_EVENT          (1 << SYS_MSI_INT_N_EVENT_SHIFT)
+#define SYS_MSI_EQ_EN_SHIFT          0
+#define SYS_MSI_EQ_EN                (1 << SYS_MSI_EQ_EN_SHIFT)
+
+#define SYS_EQ_HEAD_0_OFFSET         0x250
+#define SYS_EQ_TAIL_0_OFFSET         0x254
+#define SYS_EQ_TAIL_0_MASK           0x3F
+
+#define SYS_RC_INTX_EN               0x330
+#define SYS_RC_INTX_MASK             0xF
+
+#define SYS_RC_INTX_CSR              0x334
+#define SYS_RC_INTX_MASK             0xF
+
+#define OARR_0_OFFSET                0xD20
+#define OAAR_0_ADDR_MASK             0xF0000000
+#define OAAR_0_VALID_SHIFT           0
+#define OAAR_0_VALID                 (1 << OAAR_0_VALID_SHIFT)
+#define OAAR_0_UPPER_OFFSET          0xD24
+#define OAAR_0_UPPER_ADDR_MASK       0x0000000F
+
+#define PCIE_SYS_RC_INTX_EN_OFFSET   0x330
+
+#define OMAP_0_LOWER_OFFSET          0xD40
+#define OMAP_0_LOWER_ADDR_MASK       0xF0000000
+#define OMAP_0_UPPER_OFFSET          0x0D44
+
+#define PCIE_LINK_STATUS_OFFSET      0xF0C
+#define PCIE_PHYLINKUP_SHITF         3
+#define PCIE_PHYLINKUP               (1 << PCIE_PHYLINKUP_SHITF)
+
+#define STRAP_STATUS_OFFSET          0xF10
+#define STRAP_1LANE_SHIFT            2
+#define STRAP_1LANE                  (1 << STRAP_1LANE_SHIFT)
+#define STRAP_IF_ENABLE_SHIFT        1
+#define STRAP_IF_ENABLE              (1 << STRAP_IF_ENABLE_SHIFT)
+#define STRAP_RC_MODE_SHIFT          0
+#define STRAP_RC_MODE                (1 << STRAP_RC_MODE_SHIFT)
+
+struct iproc_pcie;
+
+/**
+ * iProc MSI
+ * @pcie: pointer to the iProc PCIe data structure
+ * @irq_in_use: bitmap of MSI IRQs that are in use
+ * @domain: MSI IRQ domain
+ * @chip: MSI controller
+ * @eq_page: memory page to store the iProc MSI event queue
+ * @msi_page: memory page for MSI posted writes
+ */
+struct iproc_msi {
+	struct iproc_pcie *pcie;
+	DECLARE_BITMAP(irq_in_use, MAX_IRQS);
+	struct irq_domain *domain;
+	struct msi_controller chip;
+	unsigned long eq_page;
+	unsigned long msi_page;
+};
+
+/**
+ * iProc PCIe
+ * @dev: pointer to the device
+ * @mii: MII/MDIO management I/O register base
+ * @reg: PCIe I/O register base
+ * @io: PCIe I/O resource
+ * @mem: PCIe memory resource
+ * @busn: PCIe bus resource
+ * @phy_addr: MIDO PHY address
+ * @irqs: Array that stores IRQs
+ * @msi: MSI related info
+ */
+struct iproc_pcie {
+	struct device *dev;
+
+	void __iomem *mii;
+	void __iomem *reg;
+
+	struct resource io;
+	struct resource mem;
+	struct resource busn;
+
+	u32 phy_addr;
+	int irqs[MAX_IRQS];
+
+	struct iproc_msi msi;
+};
+
+static inline int mdio_wait_idle(struct iproc_pcie *pcie)
+{
+	int timeout = MDIO_TIMEOUT_USEC;
+
+	while (readl(pcie->mii + MII_MGMT_CTRL_OFFSET) &
+			(1 << MII_MGMT_CTRL_BUSY_SHIFT)) {
+		udelay(1);
+		if (timeout-- <= 0)
+			return -EBUSY;
+	}
+	return 0;
+}
+
+static void mdio_init(struct iproc_pcie *pcie)
+{
+	u32 val;
+
+	val = MII_MDCDIV << MII_MGMT_CTRL_MDCDIV_SHIFT;
+	val |= (1 << MII_MGMT_CTRL_PRE_SHIFT);
+	writel(val, pcie->mii + MII_MGMT_CTRL_OFFSET);
+
+	WARN_ON(mdio_wait_idle(pcie));
+}
+
+static u16 mdio_read(struct iproc_pcie *pcie, unsigned int phy_addr,
+		unsigned int reg_addr)
+{
+	u32 val;
+
+	WARN_ON(mdio_wait_idle(pcie));
+
+	val = (MII_TA_VAL << MII_MGMT_CMD_TA_SHIFT);
+	val |= (reg_addr << MII_MGMT_CMD_RA_SHIFT);
+	val |= (phy_addr << MII_MGMT_CMD_PA_SHIFT);
+	val |= (OPCODE_READ << MII_MGMT_CMD_OP_SHIFT);
+	val |= (1 << MII_MGMT_CMD_SB_SHIFT);
+	writel(val, pcie->mii + MII_MGMT_CMD_DATA_OFFSET);
+
+	WARN_ON(mdio_wait_idle(pcie));
+
+	val = readl(pcie->mii + MII_MGMT_CMD_DATA_OFFSET) &
+		MII_MGMT_CMD_DATA_MASK;
+
+	return (u16)val;
+}
+
+static void mdio_write(struct iproc_pcie *pcie, unsigned int phy_addr,
+		unsigned int reg_addr, u16 wr_data)
+{
+	u32 val;
+
+	WARN_ON(mdio_wait_idle(pcie));
+
+	val = (MII_TA_VAL << MII_MGMT_CMD_TA_SHIFT);
+	val |= (reg_addr << MII_MGMT_CMD_RA_SHIFT);
+	val |= (phy_addr << MII_MGMT_CMD_PA_SHIFT);
+	val |= (OPCODE_WRITE << MII_MGMT_CMD_OP_SHIFT);
+	val |= (1 << MII_MGMT_CMD_SB_SHIFT);
+	val |= ((u32)wr_data & MII_MGMT_CMD_DATA_MASK);
+	writel(val, pcie->mii + MII_MGMT_CMD_DATA_OFFSET);
+
+	WARN_ON(mdio_wait_idle(pcie));
+}
+
+#define PCIE_PHY_BLK_ADDR_OFFSET 0x1F
+#define PCIE_PHY_BLK_ADDR_MASK   0xFFF0
+#define PCIE_PHY_REG_ADDR_MASK   0xF
+static u16 iproc_pcie_phy_reg_read(struct iproc_pcie *pcie,
+		unsigned int phy_addr, unsigned int reg_addr)
+{
+	u16 val;
+
+	mdio_write(pcie, phy_addr, PCIE_PHY_BLK_ADDR_OFFSET,
+			reg_addr & PCIE_PHY_BLK_ADDR_MASK);
+	val = mdio_read(pcie, phy_addr, reg_addr & PCIE_PHY_REG_ADDR_MASK);
+
+	dev_dbg(pcie->dev, "phy rd: phy: 0x%0x reg: 0x%4x data: 0x%4x\n",
+			phy_addr, reg_addr, val);
+
+	return val;
+}
+
+static void iproc_pcie_phy_reg_write(struct iproc_pcie *pcie,
+		unsigned int phy_addr, unsigned int reg_addr, u16 val)
+{
+	mdio_write(pcie, phy_addr, PCIE_PHY_BLK_ADDR_OFFSET,
+			reg_addr & PCIE_PHY_BLK_ADDR_MASK);
+	mdio_write(pcie, phy_addr, reg_addr & PCIE_PHY_REG_ADDR_MASK, val);
+
+	dev_dbg(pcie->dev, "phy wr: phy: 0x%0x reg: 0x%4x data: 0x%4x\n",
+			phy_addr, reg_addr, val);
+}
+
+static inline struct iproc_pcie *sys_to_pcie(struct pci_sys_data *sys)
+{
+	return sys->private_data;
+}
+
+static void iproc_pcie_reset(struct iproc_pcie *pcie)
+{
+	u32 val;
+
+	/* send a downstream reset */
+	val = EP_MODE_SURVIVE_PERST | RC_PCIE_RST_OUTPUT;
+	writel(val, pcie->reg + CLK_CONTROL_OFFSET);
+	udelay(250);
+	val &= ~EP_MODE_SURVIVE_PERST;
+	writel(val, pcie->reg + CLK_CONTROL_OFFSET);
+	mdelay(250);
+}
+
+#define INVALID_ACCESS_OFFSET 0xFFFFFFFF
+static u32 iproc_pcie_conf_access(struct iproc_pcie *pcie, struct pci_bus *bus,
+		unsigned int devfn, int where)
+{
+	int busno = bus->number;
+	int slot = PCI_SLOT(devfn);
+	int fn = PCI_FUNC(devfn);
+	u32 val;
+
+	/* root complex access */
+	if (busno == 0) {
+		if (slot)
+			return INVALID_ACCESS_OFFSET;
+		writel(where & CFG_IND_ADDR_MASK,
+				pcie->reg + CFG_IND_ADDR_OFFSET);
+		return CFG_IND_DATA_OFFSET;
+	}
+
+	if (fn > 1)
+		return INVALID_ACCESS_OFFSET;
+
+	/* access of EP device */
+	val = (bus->number << CFG_ADDR_BUS_NUM_SHIFT) |
+		(PCI_SLOT(devfn) << CFG_ADDR_DEV_NUM_SHIFT) |
+		(PCI_FUNC(devfn) << CFG_ADDR_FUNC_NUM_SHIFT) |
+		(where & CFG_ADDR_REG_NUM_MASK) |
+		(1 & CFG_ADDR_CFG_TYPE_MASK);
+	writel(val, pcie->reg + CFG_ADDR_OFFSET);
+
+	return CFG_DATA_OFFSET;
+}
+
+#define INVALID_CFG_RD 0xFFFFFFFF
+static int iproc_pci_read_conf(struct pci_bus *bus, unsigned int devfn,
+		int where, int size, u32 *val)
+{
+	u32 offset;
+	struct iproc_pcie *pcie = sys_to_pcie(bus->sysdata);
+
+	*val = INVALID_CFG_RD;
+
+	if (size != 1 && size != 2 && size != 4)
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+	else if ((size == 2) && (where & 1))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+	else if ((size == 4) && (where & 3))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	offset = iproc_pcie_conf_access(pcie, bus, devfn, where);
+	if (offset == INVALID_ACCESS_OFFSET)
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	*val = readl(pcie->reg + offset);
+
+	switch (size) {
+	case 4:
+		/* return raw data */
+		break;
+	case 2:
+		*val = (*val >> (8 * (where & 3))) & 0xFFFF;
+		break;
+	case 1:
+		*val = (*val >> (8 * (where & 3))) & 0xFF;
+		break;
+	default:
+		BUG_ON(1);
+	}
+
+	dev_dbg(pcie->dev, "conf rd: busn=%d devfn=%d where=%d size=%d val=0x%08x\n",
+			bus->number, devfn, where, size, *val);
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int iproc_pci_write_conf(struct pci_bus *bus, unsigned int devfn,
+		int where, int size, u32 val)
+{
+	int shift;
+	u32 offset, data;
+	struct iproc_pcie *pcie = sys_to_pcie(bus->sysdata);
+
+	if (size != 1 && size != 2 && size != 4)
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+	else if ((size == 2) && (where & 1))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+	else if ((size == 4) && (where & 3))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	offset = iproc_pcie_conf_access(pcie, bus, devfn, where);
+	if (offset == INVALID_ACCESS_OFFSET)
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	data = readl(pcie->reg + offset);
+
+	switch (size) {
+	case 4:
+		data = val;
+		break;
+	case 2:
+		shift = 8 * (where & 2);
+		data &= ~(0xFFFF << shift);
+		data |= ((val & 0xFFFF) << shift);
+		break;
+	case 1:
+		shift = 8 * (where & 3);
+		data &= ~(0xFF << shift);
+		data |= ((val & 0xFF) << shift);
+		break;
+	default:
+		BUG_ON(1);
+	}
+
+	writel(data, pcie->reg + offset);
+
+	dev_dbg(pcie->dev,
+		"config wr: busn=%d devfn=%d where=%d size=%d data=0x%08x\n",
+		bus->number, devfn, where, size, data);
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static struct pci_ops iproc_pcie_ops = {
+	.read = iproc_pci_read_conf,
+	.write = iproc_pci_write_conf,
+};
+
+static int iproc_pcie_check_link(struct iproc_pcie *pcie)
+{
+	int ret;
+	u8 nlw;
+	u16 pos, tmp16;
+	u32 val;
+	struct pci_sys_data sys;
+	struct pci_bus bus;
+
+	val = readl(pcie->reg + PCIE_LINK_STATUS_OFFSET);
+	dev_dbg(pcie->dev, "link status: 0x%08x\n", val);
+
+	val = readl(pcie->reg + STRAP_STATUS_OFFSET);
+	dev_dbg(pcie->dev, "strap status: 0x%08x\n", val);
+
+	memset(&sys, 0, sizeof(sys));
+	memset(&bus, 0, sizeof(bus));
+
+	bus.number = 0;
+	bus.ops = &iproc_pcie_ops;
+	bus.sysdata = &sys;
+	sys.private_data = pcie;
+
+	ret = iproc_pci_read_conf(&bus, 0, PCI_HEADER_TYPE, 1, &val);
+	if (ret != PCIBIOS_SUCCESSFUL || val != PCI_HEADER_TYPE_BRIDGE) {
+		dev_err(pcie->dev, "in EP mode, val=0x08%x\n", val);
+		return -EFAULT;
+	}
+
+	/*
+	 * Under RC mode, write to function specific register 0x43c, to change
+	 * the CLASS code in configuration space
+	 *
+	 * After this modification, the CLASS code in configuration space would
+	 * be read as PCI_CLASS_BRIDGE_PCI(0x0604)
+	 */
+#define PCI_BRIDGE_CTRL_REG_OFFSET 0x43C
+#define PCI_CLASS_BRIDGE_PCI_MASK  0xFF0000FF
+	pci_bus_read_config_dword(&bus, 0, PCI_BRIDGE_CTRL_REG_OFFSET, &val);
+	val = (val & PCI_CLASS_BRIDGE_PCI_MASK) | (PCI_CLASS_BRIDGE_PCI << 8);
+	pci_bus_write_config_dword(&bus, 0, PCI_BRIDGE_CTRL_REG_OFFSET, val);
+
+	/* check link status to see if link is active */
+	pos = pci_bus_find_capability(&bus, 0, PCI_CAP_ID_EXP);
+	pci_bus_read_config_word(&bus, 0, pos + PCI_EXP_LNKSTA, &tmp16);
+	tmp16 &= PCI_EXP_LNKSTA_DLLLA;
+	nlw = (tmp16 & PCI_EXP_LNKSTA_NLW) >> PCI_EXP_LNKSTA_NLW_SHIFT;
+
+	if (nlw == 0) {
+		/* try GEN 1 link speed */
+#define PCI_LINK_STATUS_CTRL_2_OFFSET 0xDC
+#define PCI_TARGET_LINK_SPEED_MASK    0xF
+#define PCI_TARGET_LINK_SPEED_GEN2    0x2
+#define PCI_TARGET_LINK_SPEED_GEN1    0x1
+		pci_bus_read_config_dword(&bus, 0,
+				PCI_LINK_STATUS_CTRL_2_OFFSET, &val);
+		if ((val & PCI_TARGET_LINK_SPEED_MASK) ==
+				PCI_TARGET_LINK_SPEED_GEN2) {
+			val &= ~PCI_TARGET_LINK_SPEED_MASK;
+			val |= PCI_TARGET_LINK_SPEED_GEN1;
+			pci_bus_write_config_dword(&bus, 0,
+					PCI_LINK_STATUS_CTRL_2_OFFSET, val);
+			pci_bus_read_config_dword(&bus, 0,
+					PCI_LINK_STATUS_CTRL_2_OFFSET, &val);
+			mdelay(100);
+
+			pos = pci_bus_find_capability(&bus, 0, PCI_CAP_ID_EXP);
+			pci_bus_read_config_word(&bus, 0, pos + PCI_EXP_LNKSTA,
+					&tmp16);
+			nlw = (tmp16 & PCI_EXP_LNKSTA_NLW) >>
+				PCI_EXP_LNKSTA_NLW_SHIFT;
+		}
+	}
+
+	dev_info(pcie->dev, "link: %s\n", nlw ? "UP" : "DOWN");
+
+	return nlw ? 0 : -ENODEV;
+}
+
+static int iproc_pcie_setup(int nr, struct pci_sys_data *sys)
+{
+	struct iproc_pcie *pcie = sys_to_pcie(sys);
+
+	pci_add_resource(&sys->resources, &pcie->io);
+	pci_add_resource(&sys->resources, &pcie->mem);
+	pci_add_resource(&sys->resources, &pcie->busn);
+
+	return 1;
+}
+
+static struct pci_bus *iproc_pcie_scan_bus(int nr, struct pci_sys_data *sys)
+{
+	struct iproc_pcie *pcie = sys->private_data;
+	struct pci_bus *bus;
+
+	bus = pci_create_root_bus(pcie->dev, sys->busnr, &iproc_pcie_ops, sys,
+			&sys->resources);
+	if (!bus)
+		return NULL;
+
+	if (IS_ENABLED(CONFIG_PCI_MSI))
+		bus->msi = &pcie->msi.chip;
+
+	pci_scan_child_bus(bus);
+
+	return bus;
+}
+
+static struct hw_pci hw;
+
+static void iproc_pcie_enable(struct iproc_pcie *pcie)
+{
+	hw.nr_controllers = 1;
+	hw.private_data = (void **)&pcie;
+	hw.setup = iproc_pcie_setup;
+	hw.scan = iproc_pcie_scan_bus;
+	hw.map_irq = of_irq_parse_and_map_pci;
+	hw.ops = &iproc_pcie_ops;
+
+	/* enable root complex INTX */
+	writel(SYS_RC_INTX_MASK, pcie->reg + SYS_RC_INTX_EN);
+
+	pci_common_init_dev(pcie->dev, &hw);
+#ifdef CONFIG_PCI_DOMAINS
+	hw.domain++;
+#endif
+}
+
+#define PCIE_PHY_REG_ADDR 0x2103
+#define PCIE_PHY_DATA     0x2B1C
+static void iproc_pcie_mii_phy_init(struct iproc_pcie *pcie, u32 phy_addr)
+{
+	unsigned int reg_addr;
+	u16 val;
+
+	mdio_init(pcie);
+
+	reg_addr = PCIE_PHY_REG_ADDR;
+	val = PCIE_PHY_DATA;
+	iproc_pcie_phy_reg_write(pcie, phy_addr, reg_addr, val);
+	val = iproc_pcie_phy_reg_read(pcie, phy_addr, reg_addr);
+	dev_info(pcie->dev, "phy: 0x%x reg: 0x%4x val: 0x%4x\n", phy_addr,
+			reg_addr, val);
+}
+
+static inline struct iproc_msi *to_iproc_msi(struct msi_controller *chip)
+{
+	return container_of(chip, struct iproc_msi, chip);
+}
+
+static int iproc_msi_irq_assign(struct iproc_msi *chip)
+{
+	int msi;
+
+	msi = find_first_zero_bit(chip->irq_in_use, MAX_IRQS);
+	if (msi < MAX_IRQS)
+		set_bit(msi, chip->irq_in_use);
+	else
+		msi = -ENOSPC;
+
+	return msi;
+}
+
+static void iproc_msi_irq_free(struct iproc_msi *chip, unsigned long irq)
+{
+	clear_bit(irq, chip->irq_in_use);
+}
+
+static int iproc_msi_setup_irq(struct msi_controller *chip,
+		struct pci_dev *pdev, struct msi_desc *desc)
+{
+	struct iproc_msi *msi = to_iproc_msi(chip);
+	struct iproc_pcie *pcie = msi->pcie;
+	struct msi_msg msg;
+	unsigned int irq;
+	int hwirq;
+
+	hwirq = iproc_msi_irq_assign(msi);
+	if (hwirq < 0)
+		return hwirq;
+
+	irq = irq_create_mapping(msi->domain, hwirq);
+	if (!irq) {
+		iproc_msi_irq_free(msi, hwirq);
+		return -EINVAL;
+	}
+
+	dev_dbg(pcie->dev, "mapped irq:%d\n", irq);
+
+	irq_set_msi_desc(irq, desc);
+
+	msg.address_lo = virt_to_phys((void *)msi->msi_page) | (hwirq * 4);
+	msg.address_hi = 0x0;
+	msg.data = hwirq;
+
+	write_msi_msg(irq, &msg);
+
+	return 0;
+}
+
+static void iproc_msi_teardown_irq(struct msi_controller *chip,
+		unsigned int irq)
+{
+	struct iproc_msi *msi = to_iproc_msi(chip);
+	struct irq_data *data = irq_get_irq_data(irq);
+
+	iproc_msi_irq_free(msi, data->hwirq);
+}
+
+static struct irq_chip iproc_msi_irq_chip = {
+	.name = "iProc PCIe MSI",
+	.irq_enable = unmask_msi_irq,
+	.irq_disable = mask_msi_irq,
+	.irq_mask = mask_msi_irq,
+	.irq_unmask = unmask_msi_irq,
+};
+
+static int iproc_msi_map(struct irq_domain *domain, unsigned int irq,
+			irq_hw_number_t hwirq)
+{
+	irq_set_chip_and_handler(irq, &iproc_msi_irq_chip, handle_simple_irq);
+	irq_set_chip_data(irq, domain->host_data);
+	set_irq_flags(irq, IRQF_VALID);
+
+	return 0;
+}
+
+static const struct irq_domain_ops iproc_msi_domain_ops = {
+	.map = iproc_msi_map,
+};
+
+static irqreturn_t iproc_msi_irq(int irq, void *data)
+{
+	struct iproc_pcie *pcie = data;
+	unsigned int eq, head, tail, num_events;
+
+	/* Do not handle INTx interrupt */
+	if ((readl(pcie->reg + SYS_RC_INTX_CSR) & SYS_RC_INTX_MASK) != 0)
+		return IRQ_NONE;
+
+	eq = irq - pcie->irqs[0];
+	BUG_ON(eq >= MAX_MSI_EQ);
+
+	irq = irq_find_mapping(pcie->msi.domain, eq);
+	head = readl(pcie->reg + SYS_EQ_HEAD_0_OFFSET + (eq * 8));
+	do {
+		tail = readl(pcie->reg + SYS_EQ_TAIL_0_OFFSET + (eq * 8));
+		tail &= SYS_EQ_TAIL_0_MASK;
+
+		num_events = (tail < head) ?
+			(64 + (tail - head)) : (tail - head);
+		if (!num_events)
+			break;
+
+		generic_handle_irq(irq);
+
+		head++;
+		head %= 64;
+		writel(head, pcie->reg + SYS_EQ_HEAD_0_OFFSET + (eq * 8));
+	} while (true);
+
+	return IRQ_HANDLED;
+}
+
+static int iproc_pcie_enable_msi(struct iproc_pcie *pcie)
+{
+	struct iproc_msi *msi = &pcie->msi;
+	struct device_node *np = pcie->dev->of_node;
+	int i, ret;
+	u32 val;
+
+	msi->pcie = pcie;
+	msi->chip.dev = pcie->dev;
+	msi->chip.setup_irq = iproc_msi_setup_irq;
+	msi->chip.teardown_irq = iproc_msi_teardown_irq;
+
+	msi->domain = irq_domain_add_linear(pcie->dev->of_node, MAX_IRQS,
+			&iproc_msi_domain_ops, &msi->chip);
+	if (!msi->domain) {
+		dev_err(pcie->dev, "failed to create IRQ domain\n");
+		return -ENOMEM;
+	}
+
+	for (i = 0; i < MAX_IRQS; i++) {
+		ret = devm_request_irq(pcie->dev, pcie->irqs[i],
+			iproc_msi_irq, IRQF_SHARED, "iproc-pcie", pcie);
+		if (ret < 0) {
+			dev_err(pcie->dev, "failed to request IRQ: %d\n",
+					pcie->irqs[i]);
+			goto err_rm_irq_domain;
+		}
+	}
+
+	msi->eq_page = __get_free_pages(GFP_KERNEL, 0);
+	if (!msi->eq_page) {
+		dev_err(pcie->dev,
+			"failed to allocate memory for MSI event queue\n");
+		ret = -ENOMEM;
+		goto err_rm_irq_domain;
+	}
+
+	msi->msi_page = __get_free_pages(GFP_KERNEL, 0);
+	if (!msi->msi_page) {
+		dev_err(pcie->dev,
+			"failed to allocate memory for MSI\n");
+		ret = -ENOMEM;
+		goto err_free_msi_eq_page;
+	}
+
+	writel(virt_to_phys((void *)msi->eq_page),
+			pcie->reg + SYS_EQ_PAGE_OFFSET);
+	writel(virt_to_phys((void *)msi->msi_page),
+			pcie->reg + SYS_MSI_PAGE_OFFSET);
+
+	for (i = 0; i < MAX_MSI_EQ; i++) {
+		/* enable MSI event queue and interrupt */
+		val = SYS_MSI_INTR_EN | SYS_MSI_INT_N_EVENT | SYS_MSI_EQ_EN;
+		writel(val, pcie->reg + SYS_MSI_CTRL_0_OFFSET + (i * 4));
+		/*
+		 * To support legacy platforms that require the MSI interrupt
+		 * enable register to be set explicitly
+		 */
+		if (of_find_property(np, "have-msi-inten-reg", NULL)) {
+			val = readl(pcie->reg + SYS_MSI_INTS_EN_OFFSET);
+			val |= (1 << i);
+			writel(val, pcie->reg + SYS_MSI_INTS_EN_OFFSET);
+		}
+	}
+
+	dev_info(pcie->dev, "MSI enabled\n");
+	return 0;
+
+err_free_msi_eq_page:
+	free_pages(msi->eq_page, 0);
+
+err_rm_irq_domain:
+	irq_domain_remove(msi->domain);
+	return ret;
+}
+
+static int __init iproc_pcie_probe(struct platform_device *pdev)
+{
+	struct iproc_pcie *pcie;
+	struct device_node *np = pdev->dev.of_node;
+	struct of_pci_range range;
+	struct of_pci_range_parser parser;
+	struct resource res, regs;
+	int i, ret;
+
+	pcie = devm_kzalloc(&pdev->dev, sizeof(struct iproc_pcie),
+			    GFP_KERNEL);
+	if (!pcie)
+		return -ENOMEM;
+
+	pcie->dev = &pdev->dev;
+	platform_set_drvdata(pdev, pcie);
+
+	if (of_pci_parse_bus_range(pdev->dev.of_node, &pcie->busn)) {
+		dev_err(&pdev->dev, "failed to parse bus-range property\n");
+		return -EINVAL;
+	}
+
+	/* PCIE controller registers */
+	ret = of_address_to_resource(np, 0, &regs);
+	if (ret) {
+		dev_err(pcie->dev, "unable to obtain device resources\n");
+		return -ENODEV;
+	}
+
+	pcie->reg = devm_ioremap(pcie->dev, regs.start, resource_size(&regs));
+	if (!pcie->reg) {
+		dev_err(pcie->dev, "unable to map device reg resources\n");
+		return -ENOMEM;
+	}
+
+	/* MDIO registers */
+	ret = of_address_to_resource(np, 1, &regs);
+	if (ret) {
+		dev_err(pcie->dev, "unable to obtain device resources\n");
+		return -ENODEV;
+	}
+
+	pcie->mii = devm_ioremap(pcie->dev, regs.start, resource_size(&regs));
+	if (!pcie->mii) {
+		dev_err(pcie->dev, "unable to map device mii resources\n");
+		return -ENOMEM;
+	}
+
+	for (i = 0; i < MAX_IRQS; i++) {
+		pcie->irqs[i] = irq_of_parse_and_map(np, i);
+		if (!pcie->irqs[i]) {
+			dev_err(pcie->dev, "unable to parse irq index:%d\n", i);
+			return -ENODEV;
+		}
+	}
+
+	if (of_property_read_u32(np, "phy-addr", &pcie->phy_addr)) {
+		dev_err(pcie->dev, "missing \"phy-addr\" property in DT\n");
+		return -EINVAL;
+	}
+
+	if (of_pci_range_parser_init(&parser, np)) {
+		dev_err(pcie->dev, "missing \"ranges\" property in DT\n");
+		return -EINVAL;
+	}
+
+	/* Get the PCI memory ranges from DT */
+	for_each_of_pci_range(&parser, &range) {
+		of_pci_range_to_resource(&range, np, &res);
+
+		switch (res.flags & IORESOURCE_TYPE_BITS) {
+		case IORESOURCE_IO:
+			memcpy(&pcie->io, &res, sizeof(res));
+			pcie->io.name = "I/O";
+			break;
+
+		case IORESOURCE_MEM:
+			memcpy(&pcie->mem, &res, sizeof(res));
+			pcie->mem.name = "MEM";
+			break;
+		}
+	}
+
+	if (IS_ENABLED(CONFIG_PCI_MSI)) {
+		ret = iproc_pcie_enable_msi(pcie);
+		if (ret < 0) {
+			dev_err(pcie->dev, "failed to enable MSI support\n");
+			return ret;
+		}
+	}
+
+	iproc_pcie_mii_phy_init(pcie, pcie->phy_addr);
+
+	iproc_pcie_reset(pcie);
+
+	ret = iproc_pcie_check_link(pcie);
+	if (ret) {
+		dev_err(pcie->dev, "no PCIe EP device detected\n");
+		return ret;
+	}
+
+	iproc_pcie_enable(pcie);
+	pci_assign_unassigned_resources();
+
+	return 0;
+}
+
+static const struct of_device_id iproc_pcie_of_match_table[] = {
+	{ .compatible = "brcm,iproc-pcie", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, iproc_pcie_of_match_table);
+
+static struct platform_driver iproc_pcie_driver = {
+	.driver = {
+		.owner = THIS_MODULE,
+		.name = "iproc-pcie",
+		.of_match_table =
+		   of_match_ptr(iproc_pcie_of_match_table),
+	},
+};
+
+static int __init iproc_pcie_init(void)
+{
+	return platform_driver_probe(&iproc_pcie_driver,
+			iproc_pcie_probe);
+}
+subsys_initcall(iproc_pcie_init);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom iPROC PCIe driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v2 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Ray Jui]

Add initial version of the Broadcom iProc PCIe driver. This driver
has been tested on NSP and Cygnus and is expected to work on all iProc
family of SoCs that deploys the same PCIe host controller

The driver also supports MSI

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/pci/host/Kconfig      |    9 +
 drivers/pci/host/Makefile     |    1 +
 drivers/pci/host/pcie-iproc.c |  888 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 898 insertions(+)
 create mode 100644 drivers/pci/host/pcie-iproc.c

diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
index c4b6568..22322e1 100644
--- a/drivers/pci/host/Kconfig
+++ b/drivers/pci/host/Kconfig
@@ -102,4 +102,13 @@ config PCI_LAYERSCAPE
 	help
 	  Say Y here if you want PCIe controller support on Layerscape SoCs.
 
+config PCIE_IPROC
+	bool "Broadcom iProc PCIe controller"
+	depends on ARCH_BCM_IPROC
+	help
+	  Say Y here if you want to enable the PCIe controller driver support
+	  on Broadcom's iProc family of SoCs.
+
+	  MSI is also supported in the driver.
+
 endmenu
diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
index 44c2699..1f5e9d2 100644
--- a/drivers/pci/host/Makefile
+++ b/drivers/pci/host/Makefile
@@ -12,3 +12,4 @@ obj-$(CONFIG_PCI_KEYSTONE) += pci-keystone-dw.o pci-keystone.o
 obj-$(CONFIG_PCIE_XILINX) += pcie-xilinx.o
 obj-$(CONFIG_PCI_XGENE) += pci-xgene.o
 obj-$(CONFIG_PCI_LAYERSCAPE) += pci-layerscape.o
+obj-$(CONFIG_PCIE_IPROC) += pcie-iproc.o
diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
new file mode 100644
index 0000000..6f0556b
--- /dev/null
+++ b/drivers/pci/host/pcie-iproc.c
@@ -0,0 +1,888 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/msi.h>
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/mbus.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/of_address.h>
+#include <linux/of_pci.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+
+/* max number of MSI event queues */
+#define MAX_MSI_EQ 6
+#define MAX_IRQS MAX_MSI_EQ
+
+#define MDIO_TIMEOUT_USEC 100
+
+#define OPCODE_WRITE 1
+#define OPCODE_READ  2
+
+#define MII_TA_VAL 2
+#define MII_MDCDIV 62
+
+#define MII_MGMT_CTRL_OFFSET         0x000
+#define MII_MGMT_CTRL_MDCDIV_SHIFT   0
+#define MII_MGMT_CTRL_PRE_SHIFT      7
+#define MII_MGMT_CTRL_BUSY_SHIFT     8
+#define MII_MGMT_CTRL_EXT_SHIFT      9
+#define MII_MGMT_CTRL_BTP_SHIFT      10
+
+#define MII_MGMT_CMD_DATA_OFFSET     0x004
+#define MII_MGMT_CMD_DATA_SHIFT      0
+#define MII_MGMT_CMD_TA_SHIFT        16
+#define MII_MGMT_CMD_RA_SHIFT        18
+#define MII_MGMT_CMD_PA_SHIFT        23
+#define MII_MGMT_CMD_OP_SHIFT        28
+#define MII_MGMT_CMD_SB_SHIFT        30
+#define MII_MGMT_CMD_DATA_MASK       0xFFFF
+
+#define CLK_CONTROL_OFFSET           0x000
+#define EP_PERST_SOURCE_SELECT_SHIFT 2
+#define EP_PERST_SOURCE_SELECT       (1 << EP_PERST_SOURCE_SELECT_SHIFT)
+#define EP_MODE_SURVIVE_PERST_SHIFT  1
+#define EP_MODE_SURVIVE_PERST        (1 << EP_MODE_SURVIVE_PERST_SHIFT)
+#define RC_PCIE_RST_OUTPUT_SHIFT     0
+#define RC_PCIE_RST_OUTPUT           (1 << RC_PCIE_RST_OUTPUT_SHIFT)
+
+#define CFG_IND_ADDR_OFFSET          0x120
+#define CFG_IND_ADDR_MASK            0x00001FFC
+
+#define CFG_IND_DATA_OFFSET          0x124
+
+#define CFG_ADDR_OFFSET              0x1F8
+#define CFG_ADDR_BUS_NUM_SHIFT       20
+#define CFG_ADDR_BUS_NUM_MASK        0x0FF00000
+#define CFG_ADDR_DEV_NUM_SHIFT       15
+#define CFG_ADDR_DEV_NUM_MASK        0x000F8000
+#define CFG_ADDR_FUNC_NUM_SHIFT      12
+#define CFG_ADDR_FUNC_NUM_MASK       0x00007000
+#define CFG_ADDR_REG_NUM_SHIFT       2
+#define CFG_ADDR_REG_NUM_MASK        0x00000FFC
+#define CFG_ADDR_CFG_TYPE_SHIFT      0
+#define CFG_ADDR_CFG_TYPE_MASK       0x00000003
+
+#define CFG_DATA_OFFSET              0x1FC
+
+#define SYS_EQ_PAGE_OFFSET           0x200
+#define SYS_MSI_PAGE_OFFSET          0x204
+
+#define SYS_MSI_INTS_EN_OFFSET       0x208
+
+#define SYS_MSI_CTRL_0_OFFSET        0x210
+#define SYS_MSI_INTR_EN_SHIFT        11
+#define SYS_MSI_INTR_EN              (1 << SYS_MSI_INTR_EN_SHIFT)
+#define SYS_MSI_INT_N_EVENT_SHIFT    1
+#define SYS_MSI_INT_N_EVENT          (1 << SYS_MSI_INT_N_EVENT_SHIFT)
+#define SYS_MSI_EQ_EN_SHIFT          0
+#define SYS_MSI_EQ_EN                (1 << SYS_MSI_EQ_EN_SHIFT)
+
+#define SYS_EQ_HEAD_0_OFFSET         0x250
+#define SYS_EQ_TAIL_0_OFFSET         0x254
+#define SYS_EQ_TAIL_0_MASK           0x3F
+
+#define SYS_RC_INTX_EN               0x330
+#define SYS_RC_INTX_MASK             0xF
+
+#define SYS_RC_INTX_CSR              0x334
+#define SYS_RC_INTX_MASK             0xF
+
+#define OARR_0_OFFSET                0xD20
+#define OAAR_0_ADDR_MASK             0xF0000000
+#define OAAR_0_VALID_SHIFT           0
+#define OAAR_0_VALID                 (1 << OAAR_0_VALID_SHIFT)
+#define OAAR_0_UPPER_OFFSET          0xD24
+#define OAAR_0_UPPER_ADDR_MASK       0x0000000F
+
+#define PCIE_SYS_RC_INTX_EN_OFFSET   0x330
+
+#define OMAP_0_LOWER_OFFSET          0xD40
+#define OMAP_0_LOWER_ADDR_MASK       0xF0000000
+#define OMAP_0_UPPER_OFFSET          0x0D44
+
+#define PCIE_LINK_STATUS_OFFSET      0xF0C
+#define PCIE_PHYLINKUP_SHITF         3
+#define PCIE_PHYLINKUP               (1 << PCIE_PHYLINKUP_SHITF)
+
+#define STRAP_STATUS_OFFSET          0xF10
+#define STRAP_1LANE_SHIFT            2
+#define STRAP_1LANE                  (1 << STRAP_1LANE_SHIFT)
+#define STRAP_IF_ENABLE_SHIFT        1
+#define STRAP_IF_ENABLE              (1 << STRAP_IF_ENABLE_SHIFT)
+#define STRAP_RC_MODE_SHIFT          0
+#define STRAP_RC_MODE                (1 << STRAP_RC_MODE_SHIFT)
+
+struct iproc_pcie;
+
+/**
+ * iProc MSI
+ * @pcie: pointer to the iProc PCIe data structure
+ * @irq_in_use: bitmap of MSI IRQs that are in use
+ * @domain: MSI IRQ domain
+ * @chip: MSI controller
+ * @eq_page: memory page to store the iProc MSI event queue
+ * @msi_page: memory page for MSI posted writes
+ */
+struct iproc_msi {
+	struct iproc_pcie *pcie;
+	DECLARE_BITMAP(irq_in_use, MAX_IRQS);
+	struct irq_domain *domain;
+	struct msi_controller chip;
+	unsigned long eq_page;
+	unsigned long msi_page;
+};
+
+/**
+ * iProc PCIe
+ * @dev: pointer to the device
+ * @mii: MII/MDIO management I/O register base
+ * @reg: PCIe I/O register base
+ * @io: PCIe I/O resource
+ * @mem: PCIe memory resource
+ * @busn: PCIe bus resource
+ * @phy_addr: MIDO PHY address
+ * @irqs: Array that stores IRQs
+ * @msi: MSI related info
+ */
+struct iproc_pcie {
+	struct device *dev;
+
+	void __iomem *mii;
+	void __iomem *reg;
+
+	struct resource io;
+	struct resource mem;
+	struct resource busn;
+
+	u32 phy_addr;
+	int irqs[MAX_IRQS];
+
+	struct iproc_msi msi;
+};
+
+static inline int mdio_wait_idle(struct iproc_pcie *pcie)
+{
+	int timeout = MDIO_TIMEOUT_USEC;
+
+	while (readl(pcie->mii + MII_MGMT_CTRL_OFFSET) &
+			(1 << MII_MGMT_CTRL_BUSY_SHIFT)) {
+		udelay(1);
+		if (timeout-- <= 0)
+			return -EBUSY;
+	}
+	return 0;
+}
+
+static void mdio_init(struct iproc_pcie *pcie)
+{
+	u32 val;
+
+	val = MII_MDCDIV << MII_MGMT_CTRL_MDCDIV_SHIFT;
+	val |= (1 << MII_MGMT_CTRL_PRE_SHIFT);
+	writel(val, pcie->mii + MII_MGMT_CTRL_OFFSET);
+
+	WARN_ON(mdio_wait_idle(pcie));
+}
+
+static u16 mdio_read(struct iproc_pcie *pcie, unsigned int phy_addr,
+		unsigned int reg_addr)
+{
+	u32 val;
+
+	WARN_ON(mdio_wait_idle(pcie));
+
+	val = (MII_TA_VAL << MII_MGMT_CMD_TA_SHIFT);
+	val |= (reg_addr << MII_MGMT_CMD_RA_SHIFT);
+	val |= (phy_addr << MII_MGMT_CMD_PA_SHIFT);
+	val |= (OPCODE_READ << MII_MGMT_CMD_OP_SHIFT);
+	val |= (1 << MII_MGMT_CMD_SB_SHIFT);
+	writel(val, pcie->mii + MII_MGMT_CMD_DATA_OFFSET);
+
+	WARN_ON(mdio_wait_idle(pcie));
+
+	val = readl(pcie->mii + MII_MGMT_CMD_DATA_OFFSET) &
+		MII_MGMT_CMD_DATA_MASK;
+
+	return (u16)val;
+}
+
+static void mdio_write(struct iproc_pcie *pcie, unsigned int phy_addr,
+		unsigned int reg_addr, u16 wr_data)
+{
+	u32 val;
+
+	WARN_ON(mdio_wait_idle(pcie));
+
+	val = (MII_TA_VAL << MII_MGMT_CMD_TA_SHIFT);
+	val |= (reg_addr << MII_MGMT_CMD_RA_SHIFT);
+	val |= (phy_addr << MII_MGMT_CMD_PA_SHIFT);
+	val |= (OPCODE_WRITE << MII_MGMT_CMD_OP_SHIFT);
+	val |= (1 << MII_MGMT_CMD_SB_SHIFT);
+	val |= ((u32)wr_data & MII_MGMT_CMD_DATA_MASK);
+	writel(val, pcie->mii + MII_MGMT_CMD_DATA_OFFSET);
+
+	WARN_ON(mdio_wait_idle(pcie));
+}
+
+#define PCIE_PHY_BLK_ADDR_OFFSET 0x1F
+#define PCIE_PHY_BLK_ADDR_MASK   0xFFF0
+#define PCIE_PHY_REG_ADDR_MASK   0xF
+static u16 iproc_pcie_phy_reg_read(struct iproc_pcie *pcie,
+		unsigned int phy_addr, unsigned int reg_addr)
+{
+	u16 val;
+
+	mdio_write(pcie, phy_addr, PCIE_PHY_BLK_ADDR_OFFSET,
+			reg_addr & PCIE_PHY_BLK_ADDR_MASK);
+	val = mdio_read(pcie, phy_addr, reg_addr & PCIE_PHY_REG_ADDR_MASK);
+
+	dev_dbg(pcie->dev, "phy rd: phy: 0x%0x reg: 0x%4x data: 0x%4x\n",
+			phy_addr, reg_addr, val);
+
+	return val;
+}
+
+static void iproc_pcie_phy_reg_write(struct iproc_pcie *pcie,
+		unsigned int phy_addr, unsigned int reg_addr, u16 val)
+{
+	mdio_write(pcie, phy_addr, PCIE_PHY_BLK_ADDR_OFFSET,
+			reg_addr & PCIE_PHY_BLK_ADDR_MASK);
+	mdio_write(pcie, phy_addr, reg_addr & PCIE_PHY_REG_ADDR_MASK, val);
+
+	dev_dbg(pcie->dev, "phy wr: phy: 0x%0x reg: 0x%4x data: 0x%4x\n",
+			phy_addr, reg_addr, val);
+}
+
+static inline struct iproc_pcie *sys_to_pcie(struct pci_sys_data *sys)
+{
+	return sys->private_data;
+}
+
+static void iproc_pcie_reset(struct iproc_pcie *pcie)
+{
+	u32 val;
+
+	/* send a downstream reset */
+	val = EP_MODE_SURVIVE_PERST | RC_PCIE_RST_OUTPUT;
+	writel(val, pcie->reg + CLK_CONTROL_OFFSET);
+	udelay(250);
+	val &= ~EP_MODE_SURVIVE_PERST;
+	writel(val, pcie->reg + CLK_CONTROL_OFFSET);
+	mdelay(250);
+}
+
+#define INVALID_ACCESS_OFFSET 0xFFFFFFFF
+static u32 iproc_pcie_conf_access(struct iproc_pcie *pcie, struct pci_bus *bus,
+		unsigned int devfn, int where)
+{
+	int busno = bus->number;
+	int slot = PCI_SLOT(devfn);
+	int fn = PCI_FUNC(devfn);
+	u32 val;
+
+	/* root complex access */
+	if (busno == 0) {
+		if (slot)
+			return INVALID_ACCESS_OFFSET;
+		writel(where & CFG_IND_ADDR_MASK,
+				pcie->reg + CFG_IND_ADDR_OFFSET);
+		return CFG_IND_DATA_OFFSET;
+	}
+
+	if (fn > 1)
+		return INVALID_ACCESS_OFFSET;
+
+	/* access of EP device */
+	val = (bus->number << CFG_ADDR_BUS_NUM_SHIFT) |
+		(PCI_SLOT(devfn) << CFG_ADDR_DEV_NUM_SHIFT) |
+		(PCI_FUNC(devfn) << CFG_ADDR_FUNC_NUM_SHIFT) |
+		(where & CFG_ADDR_REG_NUM_MASK) |
+		(1 & CFG_ADDR_CFG_TYPE_MASK);
+	writel(val, pcie->reg + CFG_ADDR_OFFSET);
+
+	return CFG_DATA_OFFSET;
+}
+
+#define INVALID_CFG_RD 0xFFFFFFFF
+static int iproc_pci_read_conf(struct pci_bus *bus, unsigned int devfn,
+		int where, int size, u32 *val)
+{
+	u32 offset;
+	struct iproc_pcie *pcie = sys_to_pcie(bus->sysdata);
+
+	*val = INVALID_CFG_RD;
+
+	if (size != 1 && size != 2 && size != 4)
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+	else if ((size == 2) && (where & 1))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+	else if ((size == 4) && (where & 3))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	offset = iproc_pcie_conf_access(pcie, bus, devfn, where);
+	if (offset == INVALID_ACCESS_OFFSET)
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	*val = readl(pcie->reg + offset);
+
+	switch (size) {
+	case 4:
+		/* return raw data */
+		break;
+	case 2:
+		*val = (*val >> (8 * (where & 3))) & 0xFFFF;
+		break;
+	case 1:
+		*val = (*val >> (8 * (where & 3))) & 0xFF;
+		break;
+	default:
+		BUG_ON(1);
+	}
+
+	dev_dbg(pcie->dev, "conf rd: busn=%d devfn=%d where=%d size=%d val=0x%08x\n",
+			bus->number, devfn, where, size, *val);
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int iproc_pci_write_conf(struct pci_bus *bus, unsigned int devfn,
+		int where, int size, u32 val)
+{
+	int shift;
+	u32 offset, data;
+	struct iproc_pcie *pcie = sys_to_pcie(bus->sysdata);
+
+	if (size != 1 && size != 2 && size != 4)
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+	else if ((size == 2) && (where & 1))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+	else if ((size == 4) && (where & 3))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	offset = iproc_pcie_conf_access(pcie, bus, devfn, where);
+	if (offset == INVALID_ACCESS_OFFSET)
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	data = readl(pcie->reg + offset);
+
+	switch (size) {
+	case 4:
+		data = val;
+		break;
+	case 2:
+		shift = 8 * (where & 2);
+		data &= ~(0xFFFF << shift);
+		data |= ((val & 0xFFFF) << shift);
+		break;
+	case 1:
+		shift = 8 * (where & 3);
+		data &= ~(0xFF << shift);
+		data |= ((val & 0xFF) << shift);
+		break;
+	default:
+		BUG_ON(1);
+	}
+
+	writel(data, pcie->reg + offset);
+
+	dev_dbg(pcie->dev,
+		"config wr: busn=%d devfn=%d where=%d size=%d data=0x%08x\n",
+		bus->number, devfn, where, size, data);
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static struct pci_ops iproc_pcie_ops = {
+	.read = iproc_pci_read_conf,
+	.write = iproc_pci_write_conf,
+};
+
+static int iproc_pcie_check_link(struct iproc_pcie *pcie)
+{
+	int ret;
+	u8 nlw;
+	u16 pos, tmp16;
+	u32 val;
+	struct pci_sys_data sys;
+	struct pci_bus bus;
+
+	val = readl(pcie->reg + PCIE_LINK_STATUS_OFFSET);
+	dev_dbg(pcie->dev, "link status: 0x%08x\n", val);
+
+	val = readl(pcie->reg + STRAP_STATUS_OFFSET);
+	dev_dbg(pcie->dev, "strap status: 0x%08x\n", val);
+
+	memset(&sys, 0, sizeof(sys));
+	memset(&bus, 0, sizeof(bus));
+
+	bus.number = 0;
+	bus.ops = &iproc_pcie_ops;
+	bus.sysdata = &sys;
+	sys.private_data = pcie;
+
+	ret = iproc_pci_read_conf(&bus, 0, PCI_HEADER_TYPE, 1, &val);
+	if (ret != PCIBIOS_SUCCESSFUL || val != PCI_HEADER_TYPE_BRIDGE) {
+		dev_err(pcie->dev, "in EP mode, val=0x08%x\n", val);
+		return -EFAULT;
+	}
+
+	/*
+	 * Under RC mode, write to function specific register 0x43c, to change
+	 * the CLASS code in configuration space
+	 *
+	 * After this modification, the CLASS code in configuration space would
+	 * be read as PCI_CLASS_BRIDGE_PCI(0x0604)
+	 */
+#define PCI_BRIDGE_CTRL_REG_OFFSET 0x43C
+#define PCI_CLASS_BRIDGE_PCI_MASK  0xFF0000FF
+	pci_bus_read_config_dword(&bus, 0, PCI_BRIDGE_CTRL_REG_OFFSET, &val);
+	val = (val & PCI_CLASS_BRIDGE_PCI_MASK) | (PCI_CLASS_BRIDGE_PCI << 8);
+	pci_bus_write_config_dword(&bus, 0, PCI_BRIDGE_CTRL_REG_OFFSET, val);
+
+	/* check link status to see if link is active */
+	pos = pci_bus_find_capability(&bus, 0, PCI_CAP_ID_EXP);
+	pci_bus_read_config_word(&bus, 0, pos + PCI_EXP_LNKSTA, &tmp16);
+	tmp16 &= PCI_EXP_LNKSTA_DLLLA;
+	nlw = (tmp16 & PCI_EXP_LNKSTA_NLW) >> PCI_EXP_LNKSTA_NLW_SHIFT;
+
+	if (nlw == 0) {
+		/* try GEN 1 link speed */
+#define PCI_LINK_STATUS_CTRL_2_OFFSET 0xDC
+#define PCI_TARGET_LINK_SPEED_MASK    0xF
+#define PCI_TARGET_LINK_SPEED_GEN2    0x2
+#define PCI_TARGET_LINK_SPEED_GEN1    0x1
+		pci_bus_read_config_dword(&bus, 0,
+				PCI_LINK_STATUS_CTRL_2_OFFSET, &val);
+		if ((val & PCI_TARGET_LINK_SPEED_MASK) ==
+				PCI_TARGET_LINK_SPEED_GEN2) {
+			val &= ~PCI_TARGET_LINK_SPEED_MASK;
+			val |= PCI_TARGET_LINK_SPEED_GEN1;
+			pci_bus_write_config_dword(&bus, 0,
+					PCI_LINK_STATUS_CTRL_2_OFFSET, val);
+			pci_bus_read_config_dword(&bus, 0,
+					PCI_LINK_STATUS_CTRL_2_OFFSET, &val);
+			mdelay(100);
+
+			pos = pci_bus_find_capability(&bus, 0, PCI_CAP_ID_EXP);
+			pci_bus_read_config_word(&bus, 0, pos + PCI_EXP_LNKSTA,
+					&tmp16);
+			nlw = (tmp16 & PCI_EXP_LNKSTA_NLW) >>
+				PCI_EXP_LNKSTA_NLW_SHIFT;
+		}
+	}
+
+	dev_info(pcie->dev, "link: %s\n", nlw ? "UP" : "DOWN");
+
+	return nlw ? 0 : -ENODEV;
+}
+
+static int iproc_pcie_setup(int nr, struct pci_sys_data *sys)
+{
+	struct iproc_pcie *pcie = sys_to_pcie(sys);
+
+	pci_add_resource(&sys->resources, &pcie->io);
+	pci_add_resource(&sys->resources, &pcie->mem);
+	pci_add_resource(&sys->resources, &pcie->busn);
+
+	return 1;
+}
+
+static struct pci_bus *iproc_pcie_scan_bus(int nr, struct pci_sys_data *sys)
+{
+	struct iproc_pcie *pcie = sys->private_data;
+	struct pci_bus *bus;
+
+	bus = pci_create_root_bus(pcie->dev, sys->busnr, &iproc_pcie_ops, sys,
+			&sys->resources);
+	if (!bus)
+		return NULL;
+
+	if (IS_ENABLED(CONFIG_PCI_MSI))
+		bus->msi = &pcie->msi.chip;
+
+	pci_scan_child_bus(bus);
+
+	return bus;
+}
+
+static struct hw_pci hw;
+
+static void iproc_pcie_enable(struct iproc_pcie *pcie)
+{
+	hw.nr_controllers = 1;
+	hw.private_data = (void **)&pcie;
+	hw.setup = iproc_pcie_setup;
+	hw.scan = iproc_pcie_scan_bus;
+	hw.map_irq = of_irq_parse_and_map_pci;
+	hw.ops = &iproc_pcie_ops;
+
+	/* enable root complex INTX */
+	writel(SYS_RC_INTX_MASK, pcie->reg + SYS_RC_INTX_EN);
+
+	pci_common_init_dev(pcie->dev, &hw);
+#ifdef CONFIG_PCI_DOMAINS
+	hw.domain++;
+#endif
+}
+
+#define PCIE_PHY_REG_ADDR 0x2103
+#define PCIE_PHY_DATA     0x2B1C
+static void iproc_pcie_mii_phy_init(struct iproc_pcie *pcie, u32 phy_addr)
+{
+	unsigned int reg_addr;
+	u16 val;
+
+	mdio_init(pcie);
+
+	reg_addr = PCIE_PHY_REG_ADDR;
+	val = PCIE_PHY_DATA;
+	iproc_pcie_phy_reg_write(pcie, phy_addr, reg_addr, val);
+	val = iproc_pcie_phy_reg_read(pcie, phy_addr, reg_addr);
+	dev_info(pcie->dev, "phy: 0x%x reg: 0x%4x val: 0x%4x\n", phy_addr,
+			reg_addr, val);
+}
+
+static inline struct iproc_msi *to_iproc_msi(struct msi_controller *chip)
+{
+	return container_of(chip, struct iproc_msi, chip);
+}
+
+static int iproc_msi_irq_assign(struct iproc_msi *chip)
+{
+	int msi;
+
+	msi = find_first_zero_bit(chip->irq_in_use, MAX_IRQS);
+	if (msi < MAX_IRQS)
+		set_bit(msi, chip->irq_in_use);
+	else
+		msi = -ENOSPC;
+
+	return msi;
+}
+
+static void iproc_msi_irq_free(struct iproc_msi *chip, unsigned long irq)
+{
+	clear_bit(irq, chip->irq_in_use);
+}
+
+static int iproc_msi_setup_irq(struct msi_controller *chip,
+		struct pci_dev *pdev, struct msi_desc *desc)
+{
+	struct iproc_msi *msi = to_iproc_msi(chip);
+	struct iproc_pcie *pcie = msi->pcie;
+	struct msi_msg msg;
+	unsigned int irq;
+	int hwirq;
+
+	hwirq = iproc_msi_irq_assign(msi);
+	if (hwirq < 0)
+		return hwirq;
+
+	irq = irq_create_mapping(msi->domain, hwirq);
+	if (!irq) {
+		iproc_msi_irq_free(msi, hwirq);
+		return -EINVAL;
+	}
+
+	dev_dbg(pcie->dev, "mapped irq:%d\n", irq);
+
+	irq_set_msi_desc(irq, desc);
+
+	msg.address_lo = virt_to_phys((void *)msi->msi_page) | (hwirq * 4);
+	msg.address_hi = 0x0;
+	msg.data = hwirq;
+
+	write_msi_msg(irq, &msg);
+
+	return 0;
+}
+
+static void iproc_msi_teardown_irq(struct msi_controller *chip,
+		unsigned int irq)
+{
+	struct iproc_msi *msi = to_iproc_msi(chip);
+	struct irq_data *data = irq_get_irq_data(irq);
+
+	iproc_msi_irq_free(msi, data->hwirq);
+}
+
+static struct irq_chip iproc_msi_irq_chip = {
+	.name = "iProc PCIe MSI",
+	.irq_enable = unmask_msi_irq,
+	.irq_disable = mask_msi_irq,
+	.irq_mask = mask_msi_irq,
+	.irq_unmask = unmask_msi_irq,
+};
+
+static int iproc_msi_map(struct irq_domain *domain, unsigned int irq,
+			irq_hw_number_t hwirq)
+{
+	irq_set_chip_and_handler(irq, &iproc_msi_irq_chip, handle_simple_irq);
+	irq_set_chip_data(irq, domain->host_data);
+	set_irq_flags(irq, IRQF_VALID);
+
+	return 0;
+}
+
+static const struct irq_domain_ops iproc_msi_domain_ops = {
+	.map = iproc_msi_map,
+};
+
+static irqreturn_t iproc_msi_irq(int irq, void *data)
+{
+	struct iproc_pcie *pcie = data;
+	unsigned int eq, head, tail, num_events;
+
+	/* Do not handle INTx interrupt */
+	if ((readl(pcie->reg + SYS_RC_INTX_CSR) & SYS_RC_INTX_MASK) != 0)
+		return IRQ_NONE;
+
+	eq = irq - pcie->irqs[0];
+	BUG_ON(eq >= MAX_MSI_EQ);
+
+	irq = irq_find_mapping(pcie->msi.domain, eq);
+	head = readl(pcie->reg + SYS_EQ_HEAD_0_OFFSET + (eq * 8));
+	do {
+		tail = readl(pcie->reg + SYS_EQ_TAIL_0_OFFSET + (eq * 8));
+		tail &= SYS_EQ_TAIL_0_MASK;
+
+		num_events = (tail < head) ?
+			(64 + (tail - head)) : (tail - head);
+		if (!num_events)
+			break;
+
+		generic_handle_irq(irq);
+
+		head++;
+		head %= 64;
+		writel(head, pcie->reg + SYS_EQ_HEAD_0_OFFSET + (eq * 8));
+	} while (true);
+
+	return IRQ_HANDLED;
+}
+
+static int iproc_pcie_enable_msi(struct iproc_pcie *pcie)
+{
+	struct iproc_msi *msi = &pcie->msi;
+	struct device_node *np = pcie->dev->of_node;
+	int i, ret;
+	u32 val;
+
+	msi->pcie = pcie;
+	msi->chip.dev = pcie->dev;
+	msi->chip.setup_irq = iproc_msi_setup_irq;
+	msi->chip.teardown_irq = iproc_msi_teardown_irq;
+
+	msi->domain = irq_domain_add_linear(pcie->dev->of_node, MAX_IRQS,
+			&iproc_msi_domain_ops, &msi->chip);
+	if (!msi->domain) {
+		dev_err(pcie->dev, "failed to create IRQ domain\n");
+		return -ENOMEM;
+	}
+
+	for (i = 0; i < MAX_IRQS; i++) {
+		ret = devm_request_irq(pcie->dev, pcie->irqs[i],
+			iproc_msi_irq, IRQF_SHARED, "iproc-pcie", pcie);
+		if (ret < 0) {
+			dev_err(pcie->dev, "failed to request IRQ: %d\n",
+					pcie->irqs[i]);
+			goto err_rm_irq_domain;
+		}
+	}
+
+	msi->eq_page = __get_free_pages(GFP_KERNEL, 0);
+	if (!msi->eq_page) {
+		dev_err(pcie->dev,
+			"failed to allocate memory for MSI event queue\n");
+		ret = -ENOMEM;
+		goto err_rm_irq_domain;
+	}
+
+	msi->msi_page = __get_free_pages(GFP_KERNEL, 0);
+	if (!msi->msi_page) {
+		dev_err(pcie->dev,
+			"failed to allocate memory for MSI\n");
+		ret = -ENOMEM;
+		goto err_free_msi_eq_page;
+	}
+
+	writel(virt_to_phys((void *)msi->eq_page),
+			pcie->reg + SYS_EQ_PAGE_OFFSET);
+	writel(virt_to_phys((void *)msi->msi_page),
+			pcie->reg + SYS_MSI_PAGE_OFFSET);
+
+	for (i = 0; i < MAX_MSI_EQ; i++) {
+		/* enable MSI event queue and interrupt */
+		val = SYS_MSI_INTR_EN | SYS_MSI_INT_N_EVENT | SYS_MSI_EQ_EN;
+		writel(val, pcie->reg + SYS_MSI_CTRL_0_OFFSET + (i * 4));
+		/*
+		 * To support legacy platforms that require the MSI interrupt
+		 * enable register to be set explicitly
+		 */
+		if (of_find_property(np, "have-msi-inten-reg", NULL)) {
+			val = readl(pcie->reg + SYS_MSI_INTS_EN_OFFSET);
+			val |= (1 << i);
+			writel(val, pcie->reg + SYS_MSI_INTS_EN_OFFSET);
+		}
+	}
+
+	dev_info(pcie->dev, "MSI enabled\n");
+	return 0;
+
+err_free_msi_eq_page:
+	free_pages(msi->eq_page, 0);
+
+err_rm_irq_domain:
+	irq_domain_remove(msi->domain);
+	return ret;
+}
+
+static int __init iproc_pcie_probe(struct platform_device *pdev)
+{
+	struct iproc_pcie *pcie;
+	struct device_node *np = pdev->dev.of_node;
+	struct of_pci_range range;
+	struct of_pci_range_parser parser;
+	struct resource res, regs;
+	int i, ret;
+
+	pcie = devm_kzalloc(&pdev->dev, sizeof(struct iproc_pcie),
+			    GFP_KERNEL);
+	if (!pcie)
+		return -ENOMEM;
+
+	pcie->dev = &pdev->dev;
+	platform_set_drvdata(pdev, pcie);
+
+	if (of_pci_parse_bus_range(pdev->dev.of_node, &pcie->busn)) {
+		dev_err(&pdev->dev, "failed to parse bus-range property\n");
+		return -EINVAL;
+	}
+
+	/* PCIE controller registers */
+	ret = of_address_to_resource(np, 0, &regs);
+	if (ret) {
+		dev_err(pcie->dev, "unable to obtain device resources\n");
+		return -ENODEV;
+	}
+
+	pcie->reg = devm_ioremap(pcie->dev, regs.start, resource_size(&regs));
+	if (!pcie->reg) {
+		dev_err(pcie->dev, "unable to map device reg resources\n");
+		return -ENOMEM;
+	}
+
+	/* MDIO registers */
+	ret = of_address_to_resource(np, 1, &regs);
+	if (ret) {
+		dev_err(pcie->dev, "unable to obtain device resources\n");
+		return -ENODEV;
+	}
+
+	pcie->mii = devm_ioremap(pcie->dev, regs.start, resource_size(&regs));
+	if (!pcie->mii) {
+		dev_err(pcie->dev, "unable to map device mii resources\n");
+		return -ENOMEM;
+	}
+
+	for (i = 0; i < MAX_IRQS; i++) {
+		pcie->irqs[i] = irq_of_parse_and_map(np, i);
+		if (!pcie->irqs[i]) {
+			dev_err(pcie->dev, "unable to parse irq index:%d\n", i);
+			return -ENODEV;
+		}
+	}
+
+	if (of_property_read_u32(np, "phy-addr", &pcie->phy_addr)) {
+		dev_err(pcie->dev, "missing \"phy-addr\" property in DT\n");
+		return -EINVAL;
+	}
+
+	if (of_pci_range_parser_init(&parser, np)) {
+		dev_err(pcie->dev, "missing \"ranges\" property in DT\n");
+		return -EINVAL;
+	}
+
+	/* Get the PCI memory ranges from DT */
+	for_each_of_pci_range(&parser, &range) {
+		of_pci_range_to_resource(&range, np, &res);
+
+		switch (res.flags & IORESOURCE_TYPE_BITS) {
+		case IORESOURCE_IO:
+			memcpy(&pcie->io, &res, sizeof(res));
+			pcie->io.name = "I/O";
+			break;
+
+		case IORESOURCE_MEM:
+			memcpy(&pcie->mem, &res, sizeof(res));
+			pcie->mem.name = "MEM";
+			break;
+		}
+	}
+
+	if (IS_ENABLED(CONFIG_PCI_MSI)) {
+		ret = iproc_pcie_enable_msi(pcie);
+		if (ret < 0) {
+			dev_err(pcie->dev, "failed to enable MSI support\n");
+			return ret;
+		}
+	}
+
+	iproc_pcie_mii_phy_init(pcie, pcie->phy_addr);
+
+	iproc_pcie_reset(pcie);
+
+	ret = iproc_pcie_check_link(pcie);
+	if (ret) {
+		dev_err(pcie->dev, "no PCIe EP device detected\n");
+		return ret;
+	}
+
+	iproc_pcie_enable(pcie);
+	pci_assign_unassigned_resources();
+
+	return 0;
+}
+
+static const struct of_device_id iproc_pcie_of_match_table[] = {
+	{ .compatible = "brcm,iproc-pcie", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, iproc_pcie_of_match_table);
+
+static struct platform_driver iproc_pcie_driver = {
+	.driver = {
+		.owner = THIS_MODULE,
+		.name = "iproc-pcie",
+		.of_match_table =
+		   of_match_ptr(iproc_pcie_of_match_table),
+	},
+};
+
+static int __init iproc_pcie_init(void)
+{
+	return platform_driver_probe(&iproc_pcie_driver,
+			iproc_pcie_probe);
+}
+subsys_initcall(iproc_pcie_init);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom iPROC PCIe driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v2 3/4] ARM: mach-bcm: Enable PCIe support for iProc

[Ray Jui]

Enable PCIe driver support for Broadcom iProc family of SoCs by
selecting PCIE_IPROC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/mach-bcm/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index aaeec78..a13a0b2 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -19,6 +19,7 @@ config ARCH_BCM_IPROC
 	select ARCH_REQUIRE_GPIOLIB
 	select ARM_AMBA
 	select PINCTRL
+	select PCIE_IPROC
 	help
 	  This enables support for systems based on Broadcom IPROC architected SoCs.
 	  The IPROC complex contains one or more ARM CPUs along with common
-- 
1.7.9.5

[PATCH v2 3/4] ARM: mach-bcm: Enable PCIe support for iProc

[Ray Jui]

Enable PCIe driver support for Broadcom iProc family of SoCs by
selecting PCIE_IPROC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/mach-bcm/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index aaeec78..a13a0b2 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -19,6 +19,7 @@ config ARCH_BCM_IPROC
 	select ARCH_REQUIRE_GPIOLIB
 	select ARM_AMBA
 	select PINCTRL
+	select PCIE_IPROC
 	help
 	  This enables support for systems based on Broadcom IPROC architected SoCs.
 	  The IPROC complex contains one or more ARM CPUs along with common
-- 
1.7.9.5

[PATCH v2 3/4] ARM: mach-bcm: Enable PCIe support for iProc

[Ray Jui]

Enable PCIe driver support for Broadcom iProc family of SoCs by
selecting PCIE_IPROC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/mach-bcm/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index aaeec78..a13a0b2 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -19,6 +19,7 @@ config ARCH_BCM_IPROC
 	select ARCH_REQUIRE_GPIOLIB
 	select ARM_AMBA
 	select PINCTRL
+	select PCIE_IPROC
 	help
 	  This enables support for systems based on Broadcom IPROC architected SoCs.
 	  The IPROC complex contains one or more ARM CPUs along with common
-- 
1.7.9.5

[PATCH v2 4/4] ARM: dts: enable PCIe for Broadcom Cygnus

[Ray Jui]

Add PCIe device nodes and its properties in bcm-cygnus.dtsi but keep it
disabled there. Only enable it in bcm958300k.dts because PCIe interfaces
are only populated on that board

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   52 +++++++++++++++++++++++++++++++++++++
 arch/arm/boot/dts/bcm958300k.dts  |    8 ++++++
 2 files changed, 60 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..07938f9 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -70,6 +70,58 @@
 		};
 	};
 
+	pcie0: pcie@18012000 {
+		compatible = "brcm,iproc-pcie";
+		reg = <0x18012000 0x1000>,
+			<0x18002000 0x1000>;
+
+		#interrupt-cells = <1>;
+		interrupts = <GIC_SPI 96 IRQ_TYPE_NONE>,
+			     <GIC_SPI 97 IRQ_TYPE_NONE>,
+			     <GIC_SPI 98 IRQ_TYPE_NONE>,
+			     <GIC_SPI 99 IRQ_TYPE_NONE>,
+			     <GIC_SPI 100 IRQ_TYPE_NONE>,
+			     <GIC_SPI 101 IRQ_TYPE_NONE>;
+		interrupt-map-mask = <0 0 0 0>;
+		interrupt-map = <0 0 0 0 &gic GIC_SPI 100 IRQ_TYPE_NONE>;
+
+		bus-range = <0x00 0xFF>;
+
+		#address-cells = <3>;
+		#size-cells = <2>;
+		device_type = "pci";
+		ranges = <0x81000000 0 0	  0x28000000 0 0x00010000
+			  0x82000000 0 0x20000000 0x20000000 0 0x04000000>;
+		phy-addr = <5>;
+		status = "disabled";
+	};
+
+	pcie1: pcie@18013000 {
+		compatible = "brcm,iproc-pcie";
+		reg = <0x18013000 0x1000>,
+			<0x18002000 0x1000>;
+
+		#interrupt-cells = <1>;
+		interrupts = <GIC_SPI 102 IRQ_TYPE_NONE>,
+			     <GIC_SPI 103 IRQ_TYPE_NONE>,
+			     <GIC_SPI 104 IRQ_TYPE_NONE>,
+			     <GIC_SPI 105 IRQ_TYPE_NONE>,
+			     <GIC_SPI 106 IRQ_TYPE_NONE>,
+			     <GIC_SPI 107 IRQ_TYPE_NONE>;
+		interrupt-map-mask = <0 0 0 0>;
+		interrupt-map = <0 0 0 0 &gic GIC_SPI 106 IRQ_TYPE_NONE>;
+
+		bus-range = <0x00 0xFF>;
+
+		#address-cells = <3>;
+		#size-cells = <2>;
+		device_type = "pci";
+		ranges = <0x81000000 0 0	  0x48000000 0 0x00010000
+			  0x82000000 0 0x40000000 0x40000000 0 0x04000000>;
+		phy-addr = <6>;
+		status = "disabled";
+	};
+
 	uart0: serial@18020000 {
 		compatible = "snps,dw-apb-uart";
 		reg = <0x18020000 0x100>;
diff --git a/arch/arm/boot/dts/bcm958300k.dts b/arch/arm/boot/dts/bcm958300k.dts
index f1bb36f..c9eb856 100644
--- a/arch/arm/boot/dts/bcm958300k.dts
+++ b/arch/arm/boot/dts/bcm958300k.dts
@@ -47,6 +47,14 @@
 		bootargs = "console=ttyS0,115200";
 	};
 
+	pcie0: pcie@18012000 {
+		status = "okay";
+	};
+
+	pcie1: pcie@18013000 {
+		status = "okay";
+	};
+
 	uart3: serial@18023000 {
 		status = "okay";
 	};
-- 
1.7.9.5

[PATCH v2 4/4] ARM: dts: enable PCIe for Broadcom Cygnus

[Ray Jui]

Add PCIe device nodes and its properties in bcm-cygnus.dtsi but keep it
disabled there. Only enable it in bcm958300k.dts because PCIe interfaces
are only populated on that board

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   52 +++++++++++++++++++++++++++++++++++++
 arch/arm/boot/dts/bcm958300k.dts  |    8 ++++++
 2 files changed, 60 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..07938f9 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -70,6 +70,58 @@
 		};
 	};
 
+	pcie0: pcie@18012000 {
+		compatible = "brcm,iproc-pcie";
+		reg = <0x18012000 0x1000>,
+			<0x18002000 0x1000>;
+
+		#interrupt-cells = <1>;
+		interrupts = <GIC_SPI 96 IRQ_TYPE_NONE>,
+			     <GIC_SPI 97 IRQ_TYPE_NONE>,
+			     <GIC_SPI 98 IRQ_TYPE_NONE>,
+			     <GIC_SPI 99 IRQ_TYPE_NONE>,
+			     <GIC_SPI 100 IRQ_TYPE_NONE>,
+			     <GIC_SPI 101 IRQ_TYPE_NONE>;
+		interrupt-map-mask = <0 0 0 0>;
+		interrupt-map = <0 0 0 0 &gic GIC_SPI 100 IRQ_TYPE_NONE>;
+
+		bus-range = <0x00 0xFF>;
+
+		#address-cells = <3>;
+		#size-cells = <2>;
+		device_type = "pci";
+		ranges = <0x81000000 0 0	  0x28000000 0 0x00010000
+			  0x82000000 0 0x20000000 0x20000000 0 0x04000000>;
+		phy-addr = <5>;
+		status = "disabled";
+	};
+
+	pcie1: pcie@18013000 {
+		compatible = "brcm,iproc-pcie";
+		reg = <0x18013000 0x1000>,
+			<0x18002000 0x1000>;
+
+		#interrupt-cells = <1>;
+		interrupts = <GIC_SPI 102 IRQ_TYPE_NONE>,
+			     <GIC_SPI 103 IRQ_TYPE_NONE>,
+			     <GIC_SPI 104 IRQ_TYPE_NONE>,
+			     <GIC_SPI 105 IRQ_TYPE_NONE>,
+			     <GIC_SPI 106 IRQ_TYPE_NONE>,
+			     <GIC_SPI 107 IRQ_TYPE_NONE>;
+		interrupt-map-mask = <0 0 0 0>;
+		interrupt-map = <0 0 0 0 &gic GIC_SPI 106 IRQ_TYPE_NONE>;
+
+		bus-range = <0x00 0xFF>;
+
+		#address-cells = <3>;
+		#size-cells = <2>;
+		device_type = "pci";
+		ranges = <0x81000000 0 0	  0x48000000 0 0x00010000
+			  0x82000000 0 0x40000000 0x40000000 0 0x04000000>;
+		phy-addr = <6>;
+		status = "disabled";
+	};
+
 	uart0: serial@18020000 {
 		compatible = "snps,dw-apb-uart";
 		reg = <0x18020000 0x100>;
diff --git a/arch/arm/boot/dts/bcm958300k.dts b/arch/arm/boot/dts/bcm958300k.dts
index f1bb36f..c9eb856 100644
--- a/arch/arm/boot/dts/bcm958300k.dts
+++ b/arch/arm/boot/dts/bcm958300k.dts
@@ -47,6 +47,14 @@
 		bootargs = "console=ttyS0,115200";
 	};
 
+	pcie0: pcie@18012000 {
+		status = "okay";
+	};
+
+	pcie1: pcie@18013000 {
+		status = "okay";
+	};
+
 	uart3: serial@18023000 {
 		status = "okay";
 	};
-- 
1.7.9.5

[PATCH v2 4/4] ARM: dts: enable PCIe for Broadcom Cygnus

[Ray Jui]

Add PCIe device nodes and its properties in bcm-cygnus.dtsi but keep it
disabled there. Only enable it in bcm958300k.dts because PCIe interfaces
are only populated on that board

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   52 +++++++++++++++++++++++++++++++++++++
 arch/arm/boot/dts/bcm958300k.dts  |    8 ++++++
 2 files changed, 60 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..07938f9 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -70,6 +70,58 @@
 		};
 	};
 
+	pcie0: pcie at 18012000 {
+		compatible = "brcm,iproc-pcie";
+		reg = <0x18012000 0x1000>,
+			<0x18002000 0x1000>;
+
+		#interrupt-cells = <1>;
+		interrupts = <GIC_SPI 96 IRQ_TYPE_NONE>,
+			     <GIC_SPI 97 IRQ_TYPE_NONE>,
+			     <GIC_SPI 98 IRQ_TYPE_NONE>,
+			     <GIC_SPI 99 IRQ_TYPE_NONE>,
+			     <GIC_SPI 100 IRQ_TYPE_NONE>,
+			     <GIC_SPI 101 IRQ_TYPE_NONE>;
+		interrupt-map-mask = <0 0 0 0>;
+		interrupt-map = <0 0 0 0 &gic GIC_SPI 100 IRQ_TYPE_NONE>;
+
+		bus-range = <0x00 0xFF>;
+
+		#address-cells = <3>;
+		#size-cells = <2>;
+		device_type = "pci";
+		ranges = <0x81000000 0 0	  0x28000000 0 0x00010000
+			  0x82000000 0 0x20000000 0x20000000 0 0x04000000>;
+		phy-addr = <5>;
+		status = "disabled";
+	};
+
+	pcie1: pcie at 18013000 {
+		compatible = "brcm,iproc-pcie";
+		reg = <0x18013000 0x1000>,
+			<0x18002000 0x1000>;
+
+		#interrupt-cells = <1>;
+		interrupts = <GIC_SPI 102 IRQ_TYPE_NONE>,
+			     <GIC_SPI 103 IRQ_TYPE_NONE>,
+			     <GIC_SPI 104 IRQ_TYPE_NONE>,
+			     <GIC_SPI 105 IRQ_TYPE_NONE>,
+			     <GIC_SPI 106 IRQ_TYPE_NONE>,
+			     <GIC_SPI 107 IRQ_TYPE_NONE>;
+		interrupt-map-mask = <0 0 0 0>;
+		interrupt-map = <0 0 0 0 &gic GIC_SPI 106 IRQ_TYPE_NONE>;
+
+		bus-range = <0x00 0xFF>;
+
+		#address-cells = <3>;
+		#size-cells = <2>;
+		device_type = "pci";
+		ranges = <0x81000000 0 0	  0x48000000 0 0x00010000
+			  0x82000000 0 0x40000000 0x40000000 0 0x04000000>;
+		phy-addr = <6>;
+		status = "disabled";
+	};
+
 	uart0: serial at 18020000 {
 		compatible = "snps,dw-apb-uart";
 		reg = <0x18020000 0x100>;
diff --git a/arch/arm/boot/dts/bcm958300k.dts b/arch/arm/boot/dts/bcm958300k.dts
index f1bb36f..c9eb856 100644
--- a/arch/arm/boot/dts/bcm958300k.dts
+++ b/arch/arm/boot/dts/bcm958300k.dts
@@ -47,6 +47,14 @@
 		bootargs = "console=ttyS0,115200";
 	};
 
+	pcie0: pcie at 18012000 {
+		status = "okay";
+	};
+
+	pcie1: pcie at 18013000 {
+		status = "okay";
+	};
+
 	uart3: serial at 18023000 {
 		status = "okay";
 	};
-- 
1.7.9.5

Re: [PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Arnd Bergmann]

On Thursday 11 December 2014 16:05:04 Ray Jui wrote:
> +
> +- linux,gpio-base:
> +    Base GPIO number of this controller
> +
> 

We've NAK'ed properties like this multiple times before, and it
doesn't get any better this time. What are you trying to achieve
here?

	Arnd

[PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Arnd Bergmann]

On Thursday 11 December 2014 16:05:04 Ray Jui wrote:
> +
> +- linux,gpio-base:
> +    Base GPIO number of this controller
> +
> 

We've NAK'ed properties like this multiple times before, and it
doesn't get any better this time. What are you trying to achieve
here?

	Arnd

Re: [PATCH v2 1/4] pci: iProc: define Broadcom iProc PCIe binding

[Arnd Bergmann]

On Thursday 11 December 2014 18:36:54 Ray Jui wrote:
> index 0000000..040bc0f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
> @@ -0,0 +1,74 @@
> +* Broadcom iProc PCIe controller
> +
> +Required properties:
> +- compatible: Must be "brcm,iproc-pcie"
> +- reg: base address and length of the PCIe controller and the MDIO interface
> +  that controls the PCIe PHY
> +- #interrupt-cells: set to <1>
> +- interrupts: interrupt IDs

How many, and what are they?

> +- interrupt-map-mask and interrupt-map, standard PCI properties to define the
> +  mapping of the PCIe interface to interrupt numbers
> +- bus-range: PCI bus numbers covered
> +- #address-cells: set to <3>
> +- #size-cells: set to <2>
> +- device_type: set to "pci"
> +- ranges: ranges for the PCI memory and I/O regions
> +- phy-addr: MDC/MDIO adddress of the PCIe PHY

It looks like the phy controller is separate from the PCI controller,
and you even list the same register range for both PHYs. Better make
that a separate driver and put the phy address into the "phys" reference.

> +- have-msi-inten-reg: Required for legacy iProc PCIe controllers that need the
> +  MSI interrupt enable register to be set explicitly
> +
> +The Broadcom iProc PCie driver adapts the multi-domain structure, i.e., each
> +interface has its own domain and therefore has its own device node
> +Example:
> +
> +SoC specific DT Entry:
> +
> +       pcie0: pcie@18012000 {
> +               compatible = "brcm,iproc-pcie";
> +               reg = <0x18012000 0x1000>,
> +                       <0x18002000 0x1000>;

I guess the addresses should be relative to the BCMA bus, and this node
get moved under that. Please see Hauke's patch series, we've discussed
this in great length already.

> +               #interrupt-cells = <1>;
> +               interrupts = <GIC_SPI 96 IRQ_TYPE_NONE>,
> +                            <GIC_SPI 97 IRQ_TYPE_NONE>,
> +                            <GIC_SPI 98 IRQ_TYPE_NONE>,
> +                            <GIC_SPI 99 IRQ_TYPE_NONE>,
> +                            <GIC_SPI 100 IRQ_TYPE_NONE>,
> +                            <GIC_SPI 101 IRQ_TYPE_NONE>;



> +               interrupt-map-mask = <0 0 0 0>;
> +               interrupt-map = <0 0 0 0 &gic GIC_SPI 100 IRQ_TYPE_NONE>;

This interrupt is also listed in the "interrupts" above, which is
probably a mistake, unless the IRQ line is shared between all PCI
devices and the PCI host itself.

> +               bus-range = <0x00 0xFF>;
> +
> +               #address-cells = >;
> +               #size-cells = <2>;
> +               device_type = "pci";
> +               ranges = <0x81000000 0 0          0x28000000 0 0x00010000   /* downstream I/O */
> +                         0x82000000 0 0x20000000 0x20000000 0 0x04000000>; /* non-prefetchable memory */
> +               phy-addr = <5>;
> +       };
> 

	Arnd

Re: [PATCH v2 1/4] pci: iProc: define Broadcom iProc PCIe binding

[Arnd Bergmann]

On Thursday 11 December 2014 18:36:54 Ray Jui wrote:
> index 0000000..040bc0f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
> @@ -0,0 +1,74 @@
> +* Broadcom iProc PCIe controller
> +
> +Required properties:
> +- compatible: Must be "brcm,iproc-pcie"
> +- reg: base address and length of the PCIe controller and the MDIO interface
> +  that controls the PCIe PHY
> +- #interrupt-cells: set to <1>
> +- interrupts: interrupt IDs

How many, and what are they?

> +- interrupt-map-mask and interrupt-map, standard PCI properties to define the
> +  mapping of the PCIe interface to interrupt numbers
> +- bus-range: PCI bus numbers covered
> +- #address-cells: set to <3>
> +- #size-cells: set to <2>
> +- device_type: set to "pci"
> +- ranges: ranges for the PCI memory and I/O regions
> +- phy-addr: MDC/MDIO adddress of the PCIe PHY

It looks like the phy controller is separate from the PCI controller,
and you even list the same register range for both PHYs. Better make
that a separate driver and put the phy address into the "phys" reference.

> +- have-msi-inten-reg: Required for legacy iProc PCIe controllers that need the
> +  MSI interrupt enable register to be set explicitly
> +
> +The Broadcom iProc PCie driver adapts the multi-domain structure, i.e., each
> +interface has its own domain and therefore has its own device node
> +Example:
> +
> +SoC specific DT Entry:
> +
> +       pcie0: pcie@18012000 {
> +               compatible = "brcm,iproc-pcie";
> +               reg = <0x18012000 0x1000>,
> +                       <0x18002000 0x1000>;

I guess the addresses should be relative to the BCMA bus, and this node
get moved under that. Please see Hauke's patch series, we've discussed
this in great length already.

> +               #interrupt-cells = <1>;
> +               interrupts = <GIC_SPI 96 IRQ_TYPE_NONE>,
> +                            <GIC_SPI 97 IRQ_TYPE_NONE>,
> +                            <GIC_SPI 98 IRQ_TYPE_NONE>,
> +                            <GIC_SPI 99 IRQ_TYPE_NONE>,
> +                            <GIC_SPI 100 IRQ_TYPE_NONE>,
> +                            <GIC_SPI 101 IRQ_TYPE_NONE>;



> +               interrupt-map-mask = <0 0 0 0>;
> +               interrupt-map = <0 0 0 0 &gic GIC_SPI 100 IRQ_TYPE_NONE>;

This interrupt is also listed in the "interrupts" above, which is
probably a mistake, unless the IRQ line is shared between all PCI
devices and the PCI host itself.

> +               bus-range = <0x00 0xFF>;
> +
> +               #address-cells = >;
> +               #size-cells = <2>;
> +               device_type = "pci";
> +               ranges = <0x81000000 0 0          0x28000000 0 0x00010000   /* downstream I/O */
> +                         0x82000000 0 0x20000000 0x20000000 0 0x04000000>; /* non-prefetchable memory */
> +               phy-addr = <5>;
> +       };
> 

	Arnd
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[PATCH v2 1/4] pci: iProc: define Broadcom iProc PCIe binding

[Arnd Bergmann]

On Thursday 11 December 2014 18:36:54 Ray Jui wrote:
> index 0000000..040bc0f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
> @@ -0,0 +1,74 @@
> +* Broadcom iProc PCIe controller
> +
> +Required properties:
> +- compatible: Must be "brcm,iproc-pcie"
> +- reg: base address and length of the PCIe controller and the MDIO interface
> +  that controls the PCIe PHY
> +- #interrupt-cells: set to <1>
> +- interrupts: interrupt IDs

How many, and what are they?

> +- interrupt-map-mask and interrupt-map, standard PCI properties to define the
> +  mapping of the PCIe interface to interrupt numbers
> +- bus-range: PCI bus numbers covered
> +- #address-cells: set to <3>
> +- #size-cells: set to <2>
> +- device_type: set to "pci"
> +- ranges: ranges for the PCI memory and I/O regions
> +- phy-addr: MDC/MDIO adddress of the PCIe PHY

It looks like the phy controller is separate from the PCI controller,
and you even list the same register range for both PHYs. Better make
that a separate driver and put the phy address into the "phys" reference.

> +- have-msi-inten-reg: Required for legacy iProc PCIe controllers that need the
> +  MSI interrupt enable register to be set explicitly
> +
> +The Broadcom iProc PCie driver adapts the multi-domain structure, i.e., each
> +interface has its own domain and therefore has its own device node
> +Example:
> +
> +SoC specific DT Entry:
> +
> +       pcie0: pcie at 18012000 {
> +               compatible = "brcm,iproc-pcie";
> +               reg = <0x18012000 0x1000>,
> +                       <0x18002000 0x1000>;

I guess the addresses should be relative to the BCMA bus, and this node
get moved under that. Please see Hauke's patch series, we've discussed
this in great length already.

> +               #interrupt-cells = <1>;
> +               interrupts = <GIC_SPI 96 IRQ_TYPE_NONE>,
> +                            <GIC_SPI 97 IRQ_TYPE_NONE>,
> +                            <GIC_SPI 98 IRQ_TYPE_NONE>,
> +                            <GIC_SPI 99 IRQ_TYPE_NONE>,
> +                            <GIC_SPI 100 IRQ_TYPE_NONE>,
> +                            <GIC_SPI 101 IRQ_TYPE_NONE>;



> +               interrupt-map-mask = <0 0 0 0>;
> +               interrupt-map = <0 0 0 0 &gic GIC_SPI 100 IRQ_TYPE_NONE>;

This interrupt is also listed in the "interrupts" above, which is
probably a mistake, unless the IRQ line is shared between all PCI
devices and the PCI host itself.

> +               bus-range = <0x00 0xFF>;
> +
> +               #address-cells = >;
> +               #size-cells = <2>;
> +               device_type = "pci";
> +               ranges = <0x81000000 0 0          0x28000000 0 0x00010000   /* downstream I/O */
> +                         0x82000000 0 0x20000000 0x20000000 0 0x04000000>; /* non-prefetchable memory */
> +               phy-addr = <5>;
> +       };
> 

	Arnd

Re: [PATCH v2 3/4] ARM: mach-bcm: Enable PCIe support for iProc

[Arnd Bergmann]

On Thursday 11 December 2014 18:36:56 Ray Jui wrote:
> Enable PCIe driver support for Broadcom iProc family of SoCs by
> selecting PCIE_IPROC
> 
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> ---
>  arch/arm/mach-bcm/Kconfig |    1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
> index aaeec78..a13a0b2 100644
> --- a/arch/arm/mach-bcm/Kconfig
> +++ b/arch/arm/mach-bcm/Kconfig
> @@ -19,6 +19,7 @@ config ARCH_BCM_IPROC
>  	select ARCH_REQUIRE_GPIOLIB
>  	select ARM_AMBA
>  	select PINCTRL
> +	select PCIE_IPROC
>  	help
>  	  This enables support for systems based on Broadcom IPROC architected SoCs.
>  	  The IPROC complex contains one or more ARM CPUs along with common
> 

No, just enable it in multi_v7_defconfig and bcm_defconfig.

	Arnd

[PATCH v2 3/4] ARM: mach-bcm: Enable PCIe support for iProc

[Arnd Bergmann]

On Thursday 11 December 2014 18:36:56 Ray Jui wrote:
> Enable PCIe driver support for Broadcom iProc family of SoCs by
> selecting PCIE_IPROC
> 
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> ---
>  arch/arm/mach-bcm/Kconfig |    1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
> index aaeec78..a13a0b2 100644
> --- a/arch/arm/mach-bcm/Kconfig
> +++ b/arch/arm/mach-bcm/Kconfig
> @@ -19,6 +19,7 @@ config ARCH_BCM_IPROC
>  	select ARCH_REQUIRE_GPIOLIB
>  	select ARM_AMBA
>  	select PINCTRL
> +	select PCIE_IPROC
>  	help
>  	  This enables support for systems based on Broadcom IPROC architected SoCs.
>  	  The IPROC complex contains one or more ARM CPUs along with common
> 

No, just enable it in multi_v7_defconfig and bcm_defconfig.

	Arnd

Re: [PATCH v2 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Arnd Bergmann]

On Thursday 11 December 2014 18:36:55 Ray Jui wrote:
> Add initial version of the Broadcom iProc PCIe driver. This driver
> has been tested on NSP and Cygnus and is expected to work on all iProc
> family of SoCs that deploys the same PCIe host controller
>
> The driver also supports MSI

Overall, I'm not convinced it's worth continuing this driver. While it
supports more features, Hauke's version seemed much cleaner, and I'd
rather see his driver merged and have you add the additional features.

Why did you drop him from Cc again?

> +
> +#define MII_MGMT_CTRL_OFFSET         0x000
> +#define MII_MGMT_CTRL_MDCDIV_SHIFT   0
> +#define MII_MGMT_CTRL_PRE_SHIFT      7
> +#define MII_MGMT_CTRL_BUSY_SHIFT     8
> +#define MII_MGMT_CTRL_EXT_SHIFT      9
> +#define MII_MGMT_CTRL_BTP_SHIFT      10

As mentioned, better move all the MII handling to a separate driver.

> +struct iproc_pcie;
> +
> +/**
> + * iProc MSI
> + * @pcie: pointer to the iProc PCIe data structure
> + * @irq_in_use: bitmap of MSI IRQs that are in use
> + * @domain: MSI IRQ domain
> + * @chip: MSI controller
> + * @eq_page: memory page to store the iProc MSI event queue
> + * @msi_page: memory page for MSI posted writes
> + */
> +struct iproc_msi {
> +	struct iproc_pcie *pcie;
> +	DECLARE_BITMAP(irq_in_use, MAX_IRQS);
> +	struct irq_domain *domain;
> +	struct msi_controller chip;
> +	unsigned long eq_page;
> +	unsigned long msi_page;
> +};

Same for MSI. I would assume that you will eventually have
chips with this PCI core and a GICv2m or GICv3, so it would
be better to reference the MSI controller through an msi-parent
reference that can be replaced with a reference to the GIC.

> +
> +	u32 phy_addr;

struct phy *phy;

> +	int irqs[MAX_IRQS];

Please name these irqs individually according to what they do.
The MSI IRQ should of course be moved to the MSI driver.

> +	struct iproc_msi msi;
> +};
> +
> +static inline int mdio_wait_idle(struct iproc_pcie *pcie)
> +{
> +	int timeout = MDIO_TIMEOUT_USEC;
> +
> +	while (readl(pcie->mii + MII_MGMT_CTRL_OFFSET) &
> +			(1 << MII_MGMT_CTRL_BUSY_SHIFT)) {
> +		udelay(1);
> +		if (timeout-- <= 0)
> +			return -EBUSY;
> +	}
> +	return 0;
> +}

Better use ktime_get()/ktime_add_ns()/ktime_before() loop here
to do an accurate timeout.

> +static void iproc_pcie_reset(struct iproc_pcie *pcie)
> +{
> +	u32 val;
> +
> +	/* send a downstream reset */
> +	val = EP_MODE_SURVIVE_PERST | RC_PCIE_RST_OUTPUT;
> +	writel(val, pcie->reg + CLK_CONTROL_OFFSET);
> +	udelay(250);
> +	val &= ~EP_MODE_SURVIVE_PERST;
> +	writel(val, pcie->reg + CLK_CONTROL_OFFSET);
> +	mdelay(250);
> +}

250ms delay is not acceptable. Please find a way to call this function
from a context in which you can sleep.

> +static int iproc_pcie_check_link(struct iproc_pcie *pcie)
> +{
> +	int ret;
> +	u8 nlw;
> +	u16 pos, tmp16;
> +	u32 val;
> +	struct pci_sys_data sys;
> +	struct pci_bus bus;
> +
> +	val = readl(pcie->reg + PCIE_LINK_STATUS_OFFSET);
> +	dev_dbg(pcie->dev, "link status: 0x%08x\n", val);
> +
> +	val = readl(pcie->reg + STRAP_STATUS_OFFSET);
> +	dev_dbg(pcie->dev, "strap status: 0x%08x\n", val);
> +
> +	memset(&sys, 0, sizeof(sys));
> +	memset(&bus, 0, sizeof(bus));
> +
> +	bus.number = 0;
> +	bus.ops = &iproc_pcie_ops;
> +	bus.sysdata = &sys;
> +	sys.private_data = pcie;
> +
> +	ret = iproc_pci_read_conf(&bus, 0, PCI_HEADER_TYPE, 1, &val);
> +	if (ret != PCIBIOS_SUCCESSFUL || val != PCI_HEADER_TYPE_BRIDGE) {
> +		dev_err(pcie->dev, "in EP mode, val=0x08%x\n", val);
> +		return -EFAULT;
> +	}

Remove the fake pci_bus hack and just read the config space directly.

> +	if (nlw == 0) {
> +		/* try GEN 1 link speed */
> +#define PCI_LINK_STATUS_CTRL_2_OFFSET 0xDC
> +#define PCI_TARGET_LINK_SPEED_MASK    0xF
> +#define PCI_TARGET_LINK_SPEED_GEN2    0x2
> +#define PCI_TARGET_LINK_SPEED_GEN1    0x1
> +		pci_bus_read_config_dword(&bus, 0,
> +				PCI_LINK_STATUS_CTRL_2_OFFSET, &val);
> +		if ((val & PCI_TARGET_LINK_SPEED_MASK) ==
> +				PCI_TARGET_LINK_SPEED_GEN2) {
> +			val &= ~PCI_TARGET_LINK_SPEED_MASK;
> +			val |= PCI_TARGET_LINK_SPEED_GEN1;
> +			pci_bus_write_config_dword(&bus, 0,
> +					PCI_LINK_STATUS_CTRL_2_OFFSET, val);
> +			pci_bus_read_config_dword(&bus, 0,
> +					PCI_LINK_STATUS_CTRL_2_OFFSET, &val);
> +			mdelay(100);

Too much delay.

> +static struct hw_pci hw;

Put this on the stack.

> +
> +	/* Get the PCI memory ranges from DT */
> +	for_each_of_pci_range(&parser, &range) {
> +		of_pci_range_to_resource(&range, np, &res);
> +
> +		switch (res.flags & IORESOURCE_TYPE_BITS) {
> +		case IORESOURCE_IO:
> +			memcpy(&pcie->io, &res, sizeof(res));
> +			pcie->io.name = "I/O";
> +			break;
> +
> +		case IORESOURCE_MEM:
> +			memcpy(&pcie->mem, &res, sizeof(res));
> +			pcie->mem.name = "MEM";
> +			break;
> +		}
> +	}

I think you need to request all the resources here, including the physical
I/O space window.

> +static struct platform_driver iproc_pcie_driver = {
> +	.driver = {
> +		.owner = THIS_MODULE,
> +		.name = "iproc-pcie",
> +		.of_match_table =
> +		   of_match_ptr(iproc_pcie_of_match_table),
> +	},
> +};

Make this a bcma_driver.

> +static int __init iproc_pcie_init(void)
> +{
> +	return platform_driver_probe(&iproc_pcie_driver,
> +			iproc_pcie_probe);
> +}
> +subsys_initcall(iproc_pcie_init);

module_init()? Doesn't seem necessary to have this early.

	Arnd

Re: [PATCH v2 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Arnd Bergmann]

On Thursday 11 December 2014 18:36:55 Ray Jui wrote:
> Add initial version of the Broadcom iProc PCIe driver. This driver
> has been tested on NSP and Cygnus and is expected to work on all iProc
> family of SoCs that deploys the same PCIe host controller
>
> The driver also supports MSI

Overall, I'm not convinced it's worth continuing this driver. While it
supports more features, Hauke's version seemed much cleaner, and I'd
rather see his driver merged and have you add the additional features.

Why did you drop him from Cc again?

> +
> +#define MII_MGMT_CTRL_OFFSET         0x000
> +#define MII_MGMT_CTRL_MDCDIV_SHIFT   0
> +#define MII_MGMT_CTRL_PRE_SHIFT      7
> +#define MII_MGMT_CTRL_BUSY_SHIFT     8
> +#define MII_MGMT_CTRL_EXT_SHIFT      9
> +#define MII_MGMT_CTRL_BTP_SHIFT      10

As mentioned, better move all the MII handling to a separate driver.

> +struct iproc_pcie;
> +
> +/**
> + * iProc MSI
> + * @pcie: pointer to the iProc PCIe data structure
> + * @irq_in_use: bitmap of MSI IRQs that are in use
> + * @domain: MSI IRQ domain
> + * @chip: MSI controller
> + * @eq_page: memory page to store the iProc MSI event queue
> + * @msi_page: memory page for MSI posted writes
> + */
> +struct iproc_msi {
> +	struct iproc_pcie *pcie;
> +	DECLARE_BITMAP(irq_in_use, MAX_IRQS);
> +	struct irq_domain *domain;
> +	struct msi_controller chip;
> +	unsigned long eq_page;
> +	unsigned long msi_page;
> +};

Same for MSI. I would assume that you will eventually have
chips with this PCI core and a GICv2m or GICv3, so it would
be better to reference the MSI controller through an msi-parent
reference that can be replaced with a reference to the GIC.

> +
> +	u32 phy_addr;

struct phy *phy;

> +	int irqs[MAX_IRQS];

Please name these irqs individually according to what they do.
The MSI IRQ should of course be moved to the MSI driver.

> +	struct iproc_msi msi;
> +};
> +
> +static inline int mdio_wait_idle(struct iproc_pcie *pcie)
> +{
> +	int timeout = MDIO_TIMEOUT_USEC;
> +
> +	while (readl(pcie->mii + MII_MGMT_CTRL_OFFSET) &
> +			(1 << MII_MGMT_CTRL_BUSY_SHIFT)) {
> +		udelay(1);
> +		if (timeout-- <= 0)
> +			return -EBUSY;
> +	}
> +	return 0;
> +}

Better use ktime_get()/ktime_add_ns()/ktime_before() loop here
to do an accurate timeout.

> +static void iproc_pcie_reset(struct iproc_pcie *pcie)
> +{
> +	u32 val;
> +
> +	/* send a downstream reset */
> +	val = EP_MODE_SURVIVE_PERST | RC_PCIE_RST_OUTPUT;
> +	writel(val, pcie->reg + CLK_CONTROL_OFFSET);
> +	udelay(250);
> +	val &= ~EP_MODE_SURVIVE_PERST;
> +	writel(val, pcie->reg + CLK_CONTROL_OFFSET);
> +	mdelay(250);
> +}

250ms delay is not acceptable. Please find a way to call this function
from a context in which you can sleep.

> +static int iproc_pcie_check_link(struct iproc_pcie *pcie)
> +{
> +	int ret;
> +	u8 nlw;
> +	u16 pos, tmp16;
> +	u32 val;
> +	struct pci_sys_data sys;
> +	struct pci_bus bus;
> +
> +	val = readl(pcie->reg + PCIE_LINK_STATUS_OFFSET);
> +	dev_dbg(pcie->dev, "link status: 0x%08x\n", val);
> +
> +	val = readl(pcie->reg + STRAP_STATUS_OFFSET);
> +	dev_dbg(pcie->dev, "strap status: 0x%08x\n", val);
> +
> +	memset(&sys, 0, sizeof(sys));
> +	memset(&bus, 0, sizeof(bus));
> +
> +	bus.number = 0;
> +	bus.ops = &iproc_pcie_ops;
> +	bus.sysdata = &sys;
> +	sys.private_data = pcie;
> +
> +	ret = iproc_pci_read_conf(&bus, 0, PCI_HEADER_TYPE, 1, &val);
> +	if (ret != PCIBIOS_SUCCESSFUL || val != PCI_HEADER_TYPE_BRIDGE) {
> +		dev_err(pcie->dev, "in EP mode, val=0x08%x\n", val);
> +		return -EFAULT;
> +	}

Remove the fake pci_bus hack and just read the config space directly.

> +	if (nlw == 0) {
> +		/* try GEN 1 link speed */
> +#define PCI_LINK_STATUS_CTRL_2_OFFSET 0xDC
> +#define PCI_TARGET_LINK_SPEED_MASK    0xF
> +#define PCI_TARGET_LINK_SPEED_GEN2    0x2
> +#define PCI_TARGET_LINK_SPEED_GEN1    0x1
> +		pci_bus_read_config_dword(&bus, 0,
> +				PCI_LINK_STATUS_CTRL_2_OFFSET, &val);
> +		if ((val & PCI_TARGET_LINK_SPEED_MASK) ==
> +				PCI_TARGET_LINK_SPEED_GEN2) {
> +			val &= ~PCI_TARGET_LINK_SPEED_MASK;
> +			val |= PCI_TARGET_LINK_SPEED_GEN1;
> +			pci_bus_write_config_dword(&bus, 0,
> +					PCI_LINK_STATUS_CTRL_2_OFFSET, val);
> +			pci_bus_read_config_dword(&bus, 0,
> +					PCI_LINK_STATUS_CTRL_2_OFFSET, &val);
> +			mdelay(100);

Too much delay.

> +static struct hw_pci hw;

Put this on the stack.

> +
> +	/* Get the PCI memory ranges from DT */
> +	for_each_of_pci_range(&parser, &range) {
> +		of_pci_range_to_resource(&range, np, &res);
> +
> +		switch (res.flags & IORESOURCE_TYPE_BITS) {
> +		case IORESOURCE_IO:
> +			memcpy(&pcie->io, &res, sizeof(res));
> +			pcie->io.name = "I/O";
> +			break;
> +
> +		case IORESOURCE_MEM:
> +			memcpy(&pcie->mem, &res, sizeof(res));
> +			pcie->mem.name = "MEM";
> +			break;
> +		}
> +	}

I think you need to request all the resources here, including the physical
I/O space window.

> +static struct platform_driver iproc_pcie_driver = {
> +	.driver = {
> +		.owner = THIS_MODULE,
> +		.name = "iproc-pcie",
> +		.of_match_table =
> +		   of_match_ptr(iproc_pcie_of_match_table),
> +	},
> +};

Make this a bcma_driver.

> +static int __init iproc_pcie_init(void)
> +{
> +	return platform_driver_probe(&iproc_pcie_driver,
> +			iproc_pcie_probe);
> +}
> +subsys_initcall(iproc_pcie_init);

module_init()? Doesn't seem necessary to have this early.

	Arnd

[PATCH v2 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Arnd Bergmann]

On Thursday 11 December 2014 18:36:55 Ray Jui wrote:
> Add initial version of the Broadcom iProc PCIe driver. This driver
> has been tested on NSP and Cygnus and is expected to work on all iProc
> family of SoCs that deploys the same PCIe host controller
>
> The driver also supports MSI

Overall, I'm not convinced it's worth continuing this driver. While it
supports more features, Hauke's version seemed much cleaner, and I'd
rather see his driver merged and have you add the additional features.

Why did you drop him from Cc again?

> +
> +#define MII_MGMT_CTRL_OFFSET         0x000
> +#define MII_MGMT_CTRL_MDCDIV_SHIFT   0
> +#define MII_MGMT_CTRL_PRE_SHIFT      7
> +#define MII_MGMT_CTRL_BUSY_SHIFT     8
> +#define MII_MGMT_CTRL_EXT_SHIFT      9
> +#define MII_MGMT_CTRL_BTP_SHIFT      10

As mentioned, better move all the MII handling to a separate driver.

> +struct iproc_pcie;
> +
> +/**
> + * iProc MSI
> + * @pcie: pointer to the iProc PCIe data structure
> + * @irq_in_use: bitmap of MSI IRQs that are in use
> + * @domain: MSI IRQ domain
> + * @chip: MSI controller
> + * @eq_page: memory page to store the iProc MSI event queue
> + * @msi_page: memory page for MSI posted writes
> + */
> +struct iproc_msi {
> +	struct iproc_pcie *pcie;
> +	DECLARE_BITMAP(irq_in_use, MAX_IRQS);
> +	struct irq_domain *domain;
> +	struct msi_controller chip;
> +	unsigned long eq_page;
> +	unsigned long msi_page;
> +};

Same for MSI. I would assume that you will eventually have
chips with this PCI core and a GICv2m or GICv3, so it would
be better to reference the MSI controller through an msi-parent
reference that can be replaced with a reference to the GIC.

> +
> +	u32 phy_addr;

struct phy *phy;

> +	int irqs[MAX_IRQS];

Please name these irqs individually according to what they do.
The MSI IRQ should of course be moved to the MSI driver.

> +	struct iproc_msi msi;
> +};
> +
> +static inline int mdio_wait_idle(struct iproc_pcie *pcie)
> +{
> +	int timeout = MDIO_TIMEOUT_USEC;
> +
> +	while (readl(pcie->mii + MII_MGMT_CTRL_OFFSET) &
> +			(1 << MII_MGMT_CTRL_BUSY_SHIFT)) {
> +		udelay(1);
> +		if (timeout-- <= 0)
> +			return -EBUSY;
> +	}
> +	return 0;
> +}

Better use ktime_get()/ktime_add_ns()/ktime_before() loop here
to do an accurate timeout.

> +static void iproc_pcie_reset(struct iproc_pcie *pcie)
> +{
> +	u32 val;
> +
> +	/* send a downstream reset */
> +	val = EP_MODE_SURVIVE_PERST | RC_PCIE_RST_OUTPUT;
> +	writel(val, pcie->reg + CLK_CONTROL_OFFSET);
> +	udelay(250);
> +	val &= ~EP_MODE_SURVIVE_PERST;
> +	writel(val, pcie->reg + CLK_CONTROL_OFFSET);
> +	mdelay(250);
> +}

250ms delay is not acceptable. Please find a way to call this function
from a context in which you can sleep.

> +static int iproc_pcie_check_link(struct iproc_pcie *pcie)
> +{
> +	int ret;
> +	u8 nlw;
> +	u16 pos, tmp16;
> +	u32 val;
> +	struct pci_sys_data sys;
> +	struct pci_bus bus;
> +
> +	val = readl(pcie->reg + PCIE_LINK_STATUS_OFFSET);
> +	dev_dbg(pcie->dev, "link status: 0x%08x\n", val);
> +
> +	val = readl(pcie->reg + STRAP_STATUS_OFFSET);
> +	dev_dbg(pcie->dev, "strap status: 0x%08x\n", val);
> +
> +	memset(&sys, 0, sizeof(sys));
> +	memset(&bus, 0, sizeof(bus));
> +
> +	bus.number = 0;
> +	bus.ops = &iproc_pcie_ops;
> +	bus.sysdata = &sys;
> +	sys.private_data = pcie;
> +
> +	ret = iproc_pci_read_conf(&bus, 0, PCI_HEADER_TYPE, 1, &val);
> +	if (ret != PCIBIOS_SUCCESSFUL || val != PCI_HEADER_TYPE_BRIDGE) {
> +		dev_err(pcie->dev, "in EP mode, val=0x08%x\n", val);
> +		return -EFAULT;
> +	}

Remove the fake pci_bus hack and just read the config space directly.

> +	if (nlw == 0) {
> +		/* try GEN 1 link speed */
> +#define PCI_LINK_STATUS_CTRL_2_OFFSET 0xDC
> +#define PCI_TARGET_LINK_SPEED_MASK    0xF
> +#define PCI_TARGET_LINK_SPEED_GEN2    0x2
> +#define PCI_TARGET_LINK_SPEED_GEN1    0x1
> +		pci_bus_read_config_dword(&bus, 0,
> +				PCI_LINK_STATUS_CTRL_2_OFFSET, &val);
> +		if ((val & PCI_TARGET_LINK_SPEED_MASK) ==
> +				PCI_TARGET_LINK_SPEED_GEN2) {
> +			val &= ~PCI_TARGET_LINK_SPEED_MASK;
> +			val |= PCI_TARGET_LINK_SPEED_GEN1;
> +			pci_bus_write_config_dword(&bus, 0,
> +					PCI_LINK_STATUS_CTRL_2_OFFSET, val);
> +			pci_bus_read_config_dword(&bus, 0,
> +					PCI_LINK_STATUS_CTRL_2_OFFSET, &val);
> +			mdelay(100);

Too much delay.

> +static struct hw_pci hw;

Put this on the stack.

> +
> +	/* Get the PCI memory ranges from DT */
> +	for_each_of_pci_range(&parser, &range) {
> +		of_pci_range_to_resource(&range, np, &res);
> +
> +		switch (res.flags & IORESOURCE_TYPE_BITS) {
> +		case IORESOURCE_IO:
> +			memcpy(&pcie->io, &res, sizeof(res));
> +			pcie->io.name = "I/O";
> +			break;
> +
> +		case IORESOURCE_MEM:
> +			memcpy(&pcie->mem, &res, sizeof(res));
> +			pcie->mem.name = "MEM";
> +			break;
> +		}
> +	}

I think you need to request all the resources here, including the physical
I/O space window.

> +static struct platform_driver iproc_pcie_driver = {
> +	.driver = {
> +		.owner = THIS_MODULE,
> +		.name = "iproc-pcie",
> +		.of_match_table =
> +		   of_match_ptr(iproc_pcie_of_match_table),
> +	},
> +};

Make this a bcma_driver.

> +static int __init iproc_pcie_init(void)
> +{
> +	return platform_driver_probe(&iproc_pcie_driver,
> +			iproc_pcie_probe);
> +}
> +subsys_initcall(iproc_pcie_init);

module_init()? Doesn't seem necessary to have this early.

	Arnd

Re: [PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Alexandre Courbot]

On Fri, Dec 12, 2014 at 9:08 PM, Arnd Bergmann <arnd@arndb.de> wrote:
> On Thursday 11 December 2014 16:05:04 Ray Jui wrote:
>> +
>> +- linux,gpio-base:
>> +    Base GPIO number of this controller
>> +
>>
>
> We've NAK'ed properties like this multiple times before, and it
> doesn't get any better this time. What are you trying to achieve
> here?

I am to blame for suggesting using this property to Ray, and I am
fully aware that this has been rejected before, but look at what
people came with recently to palliate the lack of control over the
GPIO number space for DT platforms:

http://www.spinics.net/lists/arm-kernel/msg384847.html
https://lkml.org/lkml/2014/12/10/133

Right now GPIO numbering for platforms using DT is a very inconsistent
process, subject to change by the simple action of adjusting the value
of ARCH_NR_GPIOS (which we did recently, btw), adding a new GPIO
controller, or changing the probe order of devices. For users of the
integer or sysfs interfaces, this results in GPIO numbers that change,
and drivers and/or user-space programs that behave incorrectly.
Ironically, the only way to have consistent numbers is to use the old
platform files, where you can specify the base number of a gpio_chip.

DT is actually probably not such a bad place to provide consistency in
GPIO numbering. It has a global vision of the system layout, including
all GPIO controllers and the number of GPIOs they include, and thus
can make informed decisions. It provides a consistent result
regardless of probe order. And allowing it to assign GPIO bases to
controllers will free us from the nonsensical dependency of some
arbitrary upper-bound for GPIO numbers that ARCH_NR_GPIOS imposes on
us. Also about ARCH_NR_GPIOS, the plan is to eventually remove it
since we don't need it anymore after the removal of the global
gpio_descs array. This will again interfere with the numbering of GPIO
chips that do not have a base number provided.

Note that I don't really like this, either - but the problem is the
GPIO integer interface. Until everyone has upgraded to gpiod and we
have a replacement for the current sysfs interface (this will take a
while) we have to cope with this. This issue has been bothering users
for years, so this time I'd like to try and solve it the less ugly
way. If there is a better solution, of course I'm all for it.

Re: [PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Alexandre Courbot]

On Fri, Dec 12, 2014 at 9:08 PM, Arnd Bergmann <arnd@arndb.de> wrote:
> On Thursday 11 December 2014 16:05:04 Ray Jui wrote:
>> +
>> +- linux,gpio-base:
>> +    Base GPIO number of this controller
>> +
>>
>
> We've NAK'ed properties like this multiple times before, and it
> doesn't get any better this time. What are you trying to achieve
> here?

I am to blame for suggesting using this property to Ray, and I am
fully aware that this has been rejected before, but look at what
people came with recently to palliate the lack of control over the
GPIO number space for DT platforms:

http://www.spinics.net/lists/arm-kernel/msg384847.html
https://lkml.org/lkml/2014/12/10/133

Right now GPIO numbering for platforms using DT is a very inconsistent
process, subject to change by the simple action of adjusting the value
of ARCH_NR_GPIOS (which we did recently, btw), adding a new GPIO
controller, or changing the probe order of devices. For users of the
integer or sysfs interfaces, this results in GPIO numbers that change,
and drivers and/or user-space programs that behave incorrectly.
Ironically, the only way to have consistent numbers is to use the old
platform files, where you can specify the base number of a gpio_chip.

DT is actually probably not such a bad place to provide consistency in
GPIO numbering. It has a global vision of the system layout, including
all GPIO controllers and the number of GPIOs they include, and thus
can make informed decisions. It provides a consistent result
regardless of probe order. And allowing it to assign GPIO bases to
controllers will free us from the nonsensical dependency of some
arbitrary upper-bound for GPIO numbers that ARCH_NR_GPIOS imposes on
us. Also about ARCH_NR_GPIOS, the plan is to eventually remove it
since we don't need it anymore after the removal of the global
gpio_descs array. This will again interfere with the numbering of GPIO
chips that do not have a base number provided.

Note that I don't really like this, either - but the problem is the
GPIO integer interface. Until everyone has upgraded to gpiod and we
have a replacement for the current sysfs interface (this will take a
while) we have to cope with this. This issue has been bothering users
for years, so this time I'd like to try and solve it the less ugly
way. If there is a better solution, of course I'm all for it.

[PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Alexandre Courbot]

On Fri, Dec 12, 2014 at 9:08 PM, Arnd Bergmann <arnd@arndb.de> wrote:
> On Thursday 11 December 2014 16:05:04 Ray Jui wrote:
>> +
>> +- linux,gpio-base:
>> +    Base GPIO number of this controller
>> +
>>
>
> We've NAK'ed properties like this multiple times before, and it
> doesn't get any better this time. What are you trying to achieve
> here?

I am to blame for suggesting using this property to Ray, and I am
fully aware that this has been rejected before, but look at what
people came with recently to palliate the lack of control over the
GPIO number space for DT platforms:

http://www.spinics.net/lists/arm-kernel/msg384847.html
https://lkml.org/lkml/2014/12/10/133

Right now GPIO numbering for platforms using DT is a very inconsistent
process, subject to change by the simple action of adjusting the value
of ARCH_NR_GPIOS (which we did recently, btw), adding a new GPIO
controller, or changing the probe order of devices. For users of the
integer or sysfs interfaces, this results in GPIO numbers that change,
and drivers and/or user-space programs that behave incorrectly.
Ironically, the only way to have consistent numbers is to use the old
platform files, where you can specify the base number of a gpio_chip.

DT is actually probably not such a bad place to provide consistency in
GPIO numbering. It has a global vision of the system layout, including
all GPIO controllers and the number of GPIOs they include, and thus
can make informed decisions. It provides a consistent result
regardless of probe order. And allowing it to assign GPIO bases to
controllers will free us from the nonsensical dependency of some
arbitrary upper-bound for GPIO numbers that ARCH_NR_GPIOS imposes on
us. Also about ARCH_NR_GPIOS, the plan is to eventually remove it
since we don't need it anymore after the removal of the global
gpio_descs array. This will again interfere with the numbering of GPIO
chips that do not have a base number provided.

Note that I don't really like this, either - but the problem is the
GPIO integer interface. Until everyone has upgraded to gpiod and we
have a replacement for the current sysfs interface (this will take a
while) we have to cope with this. This issue has been bothering users
for years, so this time I'd like to try and solve it the less ugly
way. If there is a better solution, of course I'm all for it.

Re: [PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Arnd Bergmann]

On Friday 12 December 2014 22:05:37 Alexandre Courbot wrote:
> On Fri, Dec 12, 2014 at 9:08 PM, Arnd Bergmann <arnd@arndb.de> wrote:
> > On Thursday 11 December 2014 16:05:04 Ray Jui wrote:
> >> +
> >> +- linux,gpio-base:
> >> +    Base GPIO number of this controller
> >> +
> >>
> >
> > We've NAK'ed properties like this multiple times before, and it
> > doesn't get any better this time. What are you trying to achieve
> > here?
> 
> I am to blame for suggesting using this property to Ray, and I am
> fully aware that this has been rejected before, but look at what
> people came with recently to palliate the lack of control over the
> GPIO number space for DT platforms:
> 
> http://www.spinics.net/lists/arm-kernel/msg384847.html
> https://lkml.org/lkml/2014/12/10/133
> 
> Right now GPIO numbering for platforms using DT is a very inconsistent
> process, subject to change by the simple action of adjusting the value
> of ARCH_NR_GPIOS (which we did recently, btw), adding a new GPIO
> controller, or changing the probe order of devices. For users of the
> integer or sysfs interfaces, this results in GPIO numbers that change,
> and drivers and/or user-space programs that behave incorrectly.
> Ironically, the only way to have consistent numbers is to use the old
> platform files, where you can specify the base number of a gpio_chip.
> 
> DT is actually probably not such a bad place to provide consistency in
> GPIO numbering. It has a global vision of the system layout, including
> all GPIO controllers and the number of GPIOs they include, and thus
> can make informed decisions. It provides a consistent result
> regardless of probe order. And allowing it to assign GPIO bases to
> controllers will free us from the nonsensical dependency of some
> arbitrary upper-bound for GPIO numbers that ARCH_NR_GPIOS imposes on
> us. Also about ARCH_NR_GPIOS, the plan is to eventually remove it
> since we don't need it anymore after the removal of the global
> gpio_descs array. This will again interfere with the numbering of GPIO
> chips that do not have a base number provided.
> 
> Note that I don't really like this, either - but the problem is the
> GPIO integer interface. Until everyone has upgraded to gpiod and we
> have a replacement for the current sysfs interface (this will take a
> while) we have to cope with this. This issue has been bothering users
> for years, so this time I'd like to try and solve it the less ugly
> way. If there is a better solution, of course I'm all for it.

I think the scheme will fail if you ever get gpio controllers that are
not part of the DT: We have hotpluggable devices (PCI, USB, ...) that
are not represented in DT and that may also provide GPIOs for internal
uses.

The current state of affairs is definitely problematic, but defining
the GPIO numbers in DT properties would only be a relative improvement,
not a solution, and I fear it would make it harder to change the kernel
to remove the gpio numbers eventually.

I wonder if we could instead come up with an approach that completely
randomizes the gpio numbers (as a compile-time option) to find any
places that still rely on specific numbers.

	Arnd

Re: [PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Arnd Bergmann]

On Friday 12 December 2014 22:05:37 Alexandre Courbot wrote:
> On Fri, Dec 12, 2014 at 9:08 PM, Arnd Bergmann <arnd@arndb.de> wrote:
> > On Thursday 11 December 2014 16:05:04 Ray Jui wrote:
> >> +
> >> +- linux,gpio-base:
> >> +    Base GPIO number of this controller
> >> +
> >>
> >
> > We've NAK'ed properties like this multiple times before, and it
> > doesn't get any better this time. What are you trying to achieve
> > here?
> 
> I am to blame for suggesting using this property to Ray, and I am
> fully aware that this has been rejected before, but look at what
> people came with recently to palliate the lack of control over the
> GPIO number space for DT platforms:
> 
> http://www.spinics.net/lists/arm-kernel/msg384847.html
> https://lkml.org/lkml/2014/12/10/133
> 
> Right now GPIO numbering for platforms using DT is a very inconsistent
> process, subject to change by the simple action of adjusting the value
> of ARCH_NR_GPIOS (which we did recently, btw), adding a new GPIO
> controller, or changing the probe order of devices. For users of the
> integer or sysfs interfaces, this results in GPIO numbers that change,
> and drivers and/or user-space programs that behave incorrectly.
> Ironically, the only way to have consistent numbers is to use the old
> platform files, where you can specify the base number of a gpio_chip.
> 
> DT is actually probably not such a bad place to provide consistency in
> GPIO numbering. It has a global vision of the system layout, including
> all GPIO controllers and the number of GPIOs they include, and thus
> can make informed decisions. It provides a consistent result
> regardless of probe order. And allowing it to assign GPIO bases to
> controllers will free us from the nonsensical dependency of some
> arbitrary upper-bound for GPIO numbers that ARCH_NR_GPIOS imposes on
> us. Also about ARCH_NR_GPIOS, the plan is to eventually remove it
> since we don't need it anymore after the removal of the global
> gpio_descs array. This will again interfere with the numbering of GPIO
> chips that do not have a base number provided.
> 
> Note that I don't really like this, either - but the problem is the
> GPIO integer interface. Until everyone has upgraded to gpiod and we
> have a replacement for the current sysfs interface (this will take a
> while) we have to cope with this. This issue has been bothering users
> for years, so this time I'd like to try and solve it the less ugly
> way. If there is a better solution, of course I'm all for it.

I think the scheme will fail if you ever get gpio controllers that are
not part of the DT: We have hotpluggable devices (PCI, USB, ...) that
are not represented in DT and that may also provide GPIOs for internal
uses.

The current state of affairs is definitely problematic, but defining
the GPIO numbers in DT properties would only be a relative improvement,
not a solution, and I fear it would make it harder to change the kernel
to remove the gpio numbers eventually.

I wonder if we could instead come up with an approach that completely
randomizes the gpio numbers (as a compile-time option) to find any
places that still rely on specific numbers.

	Arnd

[PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Arnd Bergmann]

On Friday 12 December 2014 22:05:37 Alexandre Courbot wrote:
> On Fri, Dec 12, 2014 at 9:08 PM, Arnd Bergmann <arnd@arndb.de> wrote:
> > On Thursday 11 December 2014 16:05:04 Ray Jui wrote:
> >> +
> >> +- linux,gpio-base:
> >> +    Base GPIO number of this controller
> >> +
> >>
> >
> > We've NAK'ed properties like this multiple times before, and it
> > doesn't get any better this time. What are you trying to achieve
> > here?
> 
> I am to blame for suggesting using this property to Ray, and I am
> fully aware that this has been rejected before, but look at what
> people came with recently to palliate the lack of control over the
> GPIO number space for DT platforms:
> 
> http://www.spinics.net/lists/arm-kernel/msg384847.html
> https://lkml.org/lkml/2014/12/10/133
> 
> Right now GPIO numbering for platforms using DT is a very inconsistent
> process, subject to change by the simple action of adjusting the value
> of ARCH_NR_GPIOS (which we did recently, btw), adding a new GPIO
> controller, or changing the probe order of devices. For users of the
> integer or sysfs interfaces, this results in GPIO numbers that change,
> and drivers and/or user-space programs that behave incorrectly.
> Ironically, the only way to have consistent numbers is to use the old
> platform files, where you can specify the base number of a gpio_chip.
> 
> DT is actually probably not such a bad place to provide consistency in
> GPIO numbering. It has a global vision of the system layout, including
> all GPIO controllers and the number of GPIOs they include, and thus
> can make informed decisions. It provides a consistent result
> regardless of probe order. And allowing it to assign GPIO bases to
> controllers will free us from the nonsensical dependency of some
> arbitrary upper-bound for GPIO numbers that ARCH_NR_GPIOS imposes on
> us. Also about ARCH_NR_GPIOS, the plan is to eventually remove it
> since we don't need it anymore after the removal of the global
> gpio_descs array. This will again interfere with the numbering of GPIO
> chips that do not have a base number provided.
> 
> Note that I don't really like this, either - but the problem is the
> GPIO integer interface. Until everyone has upgraded to gpiod and we
> have a replacement for the current sysfs interface (this will take a
> while) we have to cope with this. This issue has been bothering users
> for years, so this time I'd like to try and solve it the less ugly
> way. If there is a better solution, of course I'm all for it.

I think the scheme will fail if you ever get gpio controllers that are
not part of the DT: We have hotpluggable devices (PCI, USB, ...) that
are not represented in DT and that may also provide GPIOs for internal
uses.

The current state of affairs is definitely problematic, but defining
the GPIO numbers in DT properties would only be a relative improvement,
not a solution, and I fear it would make it harder to change the kernel
to remove the gpio numbers eventually.

I wonder if we could instead come up with an approach that completely
randomizes the gpio numbers (as a compile-time option) to find any
places that still rely on specific numbers.

	Arnd

Re: [PATCH v2 1/4] pci: iProc: define Broadcom iProc PCIe binding

[Ray Jui]

On 12/12/2014 4:14 AM, Arnd Bergmann wrote:
> On Thursday 11 December 2014 18:36:54 Ray Jui wrote:
>> index 0000000..040bc0f
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
>> @@ -0,0 +1,74 @@
>> +* Broadcom iProc PCIe controller
>> +
>> +Required properties:
>> +- compatible: Must be "brcm,iproc-pcie"
>> +- reg: base address and length of the PCIe controller and the MDIO interface
>> +  that controls the PCIe PHY
>> +- #interrupt-cells: set to <1>
>> +- interrupts: interrupt IDs
>
> How many, and what are they?
>
Different iProc SoCs might have different number of interrupts. I'll 
elaborate more on the next patch.

>> +- interrupt-map-mask and interrupt-map, standard PCI properties to define the
>> +  mapping of the PCIe interface to interrupt numbers
>> +- bus-range: PCI bus numbers covered
>> +- #address-cells: set to <3>
>> +- #size-cells: set to <2>
>> +- device_type: set to "pci"
>> +- ranges: ranges for the PCI memory and I/O regions
>> +- phy-addr: MDC/MDIO adddress of the PCIe PHY
>
> It looks like the phy controller is separate from the PCI controller,
> and you even list the same register range for both PHYs. Better make
> that a separate driver and put the phy address into the "phys" reference.
>
Okay. In this case, I need to create a separate PHY driver under the 
drivers/phy directory and have the PCIe host driver reference it through 
the standard PHY API.

>> +- have-msi-inten-reg: Required for legacy iProc PCIe controllers that need the
>> +  MSI interrupt enable register to be set explicitly
>> +
>> +The Broadcom iProc PCie driver adapts the multi-domain structure, i.e., each
>> +interface has its own domain and therefore has its own device node
>> +Example:
>> +
>> +SoC specific DT Entry:
>> +
>> +       pcie0: pcie@18012000 {
>> +               compatible = "brcm,iproc-pcie";
>> +               reg = <0x18012000 0x1000>,
>> +                       <0x18002000 0x1000>;
>
> I guess the addresses should be relative to the BCMA bus, and this node
> get moved under that. Please see Hauke's patch series, we've discussed
> this in great length already.
>

As Arend van Spriel pointed out in the previous discussion:

BCMA core is the bus driver for discoverable ARM AXI interconnect. Apart 
from that it also provides drivers for some cores. For the chips to be 
discoverable it needs additional IP logic.

Not all iProc family of SoCs have the additional IP logic and for those 
which don't, they cannot use the BCMA bus.

>> +               #interrupt-cells = <1>;
>> +               interrupts = <GIC_SPI 96 IRQ_TYPE_NONE>,
>> +                            <GIC_SPI 97 IRQ_TYPE_NONE>,
>> +                            <GIC_SPI 98 IRQ_TYPE_NONE>,
>> +                            <GIC_SPI 99 IRQ_TYPE_NONE>,
>> +                            <GIC_SPI 100 IRQ_TYPE_NONE>,
>> +                            <GIC_SPI 101 IRQ_TYPE_NONE>;
>
>
>
>> +               interrupt-map-mask = <0 0 0 0>;
>> +               interrupt-map = <0 0 0 0 &gic GIC_SPI 100 IRQ_TYPE_NONE>;
>
> This interrupt is also listed in the "interrupts" above, which is
> probably a mistake, unless the IRQ line is shared between all PCI
> devices and the PCI host itself.
>
interrupts are for MSI interrupt support and interrupt-map is for legacy 
INTx support. To my best knowledge, MSI and INTx cannot be used at the 
same time. "nvidia,tegra20-pcie.txt" and "rcar-pci.txt" have similar 
configurations.

>> +               bus-range = <0x00 0xFF>;
>> +
>> +               #address-cells = >;
>> +               #size-cells = <2>;
>> +               device_type = "pci";
>> +               ranges = <0x81000000 0 0          0x28000000 0 0x00010000   /* downstream I/O */
>> +                         0x82000000 0 0x20000000 0x20000000 0 0x04000000>; /* non-prefetchable memory */
>> +               phy-addr = <5>;
>> +       };
>>
>
> 	Arnd
>

Re: [PATCH v2 1/4] pci: iProc: define Broadcom iProc PCIe binding

[Ray Jui]

On 12/12/2014 4:14 AM, Arnd Bergmann wrote:
> On Thursday 11 December 2014 18:36:54 Ray Jui wrote:
>> index 0000000..040bc0f
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
>> @@ -0,0 +1,74 @@
>> +* Broadcom iProc PCIe controller
>> +
>> +Required properties:
>> +- compatible: Must be "brcm,iproc-pcie"
>> +- reg: base address and length of the PCIe controller and the MDIO interface
>> +  that controls the PCIe PHY
>> +- #interrupt-cells: set to <1>
>> +- interrupts: interrupt IDs
>
> How many, and what are they?
>
Different iProc SoCs might have different number of interrupts. I'll 
elaborate more on the next patch.

>> +- interrupt-map-mask and interrupt-map, standard PCI properties to define the
>> +  mapping of the PCIe interface to interrupt numbers
>> +- bus-range: PCI bus numbers covered
>> +- #address-cells: set to <3>
>> +- #size-cells: set to <2>
>> +- device_type: set to "pci"
>> +- ranges: ranges for the PCI memory and I/O regions
>> +- phy-addr: MDC/MDIO adddress of the PCIe PHY
>
> It looks like the phy controller is separate from the PCI controller,
> and you even list the same register range for both PHYs. Better make
> that a separate driver and put the phy address into the "phys" reference.
>
Okay. In this case, I need to create a separate PHY driver under the 
drivers/phy directory and have the PCIe host driver reference it through 
the standard PHY API.

>> +- have-msi-inten-reg: Required for legacy iProc PCIe controllers that need the
>> +  MSI interrupt enable register to be set explicitly
>> +
>> +The Broadcom iProc PCie driver adapts the multi-domain structure, i.e., each
>> +interface has its own domain and therefore has its own device node
>> +Example:
>> +
>> +SoC specific DT Entry:
>> +
>> +       pcie0: pcie@18012000 {
>> +               compatible = "brcm,iproc-pcie";
>> +               reg = <0x18012000 0x1000>,
>> +                       <0x18002000 0x1000>;
>
> I guess the addresses should be relative to the BCMA bus, and this node
> get moved under that. Please see Hauke's patch series, we've discussed
> this in great length already.
>

As Arend van Spriel pointed out in the previous discussion:

BCMA core is the bus driver for discoverable ARM AXI interconnect. Apart 
from that it also provides drivers for some cores. For the chips to be 
discoverable it needs additional IP logic.

Not all iProc family of SoCs have the additional IP logic and for those 
which don't, they cannot use the BCMA bus.

>> +               #interrupt-cells = <1>;
>> +               interrupts = <GIC_SPI 96 IRQ_TYPE_NONE>,
>> +                            <GIC_SPI 97 IRQ_TYPE_NONE>,
>> +                            <GIC_SPI 98 IRQ_TYPE_NONE>,
>> +                            <GIC_SPI 99 IRQ_TYPE_NONE>,
>> +                            <GIC_SPI 100 IRQ_TYPE_NONE>,
>> +                            <GIC_SPI 101 IRQ_TYPE_NONE>;
>
>
>
>> +               interrupt-map-mask = <0 0 0 0>;
>> +               interrupt-map = <0 0 0 0 &gic GIC_SPI 100 IRQ_TYPE_NONE>;
>
> This interrupt is also listed in the "interrupts" above, which is
> probably a mistake, unless the IRQ line is shared between all PCI
> devices and the PCI host itself.
>
interrupts are for MSI interrupt support and interrupt-map is for legacy 
INTx support. To my best knowledge, MSI and INTx cannot be used at the 
same time. "nvidia,tegra20-pcie.txt" and "rcar-pci.txt" have similar 
configurations.

>> +               bus-range = <0x00 0xFF>;
>> +
>> +               #address-cells = >;
>> +               #size-cells = <2>;
>> +               device_type = "pci";
>> +               ranges = <0x81000000 0 0          0x28000000 0 0x00010000   /* downstream I/O */
>> +                         0x82000000 0 0x20000000 0x20000000 0 0x04000000>; /* non-prefetchable memory */
>> +               phy-addr = <5>;
>> +       };
>>
>
> 	Arnd
>

[PATCH v2 1/4] pci: iProc: define Broadcom iProc PCIe binding

[Ray Jui]

On 12/12/2014 4:14 AM, Arnd Bergmann wrote:
> On Thursday 11 December 2014 18:36:54 Ray Jui wrote:
>> index 0000000..040bc0f
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
>> @@ -0,0 +1,74 @@
>> +* Broadcom iProc PCIe controller
>> +
>> +Required properties:
>> +- compatible: Must be "brcm,iproc-pcie"
>> +- reg: base address and length of the PCIe controller and the MDIO interface
>> +  that controls the PCIe PHY
>> +- #interrupt-cells: set to <1>
>> +- interrupts: interrupt IDs
>
> How many, and what are they?
>
Different iProc SoCs might have different number of interrupts. I'll 
elaborate more on the next patch.

>> +- interrupt-map-mask and interrupt-map, standard PCI properties to define the
>> +  mapping of the PCIe interface to interrupt numbers
>> +- bus-range: PCI bus numbers covered
>> +- #address-cells: set to <3>
>> +- #size-cells: set to <2>
>> +- device_type: set to "pci"
>> +- ranges: ranges for the PCI memory and I/O regions
>> +- phy-addr: MDC/MDIO adddress of the PCIe PHY
>
> It looks like the phy controller is separate from the PCI controller,
> and you even list the same register range for both PHYs. Better make
> that a separate driver and put the phy address into the "phys" reference.
>
Okay. In this case, I need to create a separate PHY driver under the 
drivers/phy directory and have the PCIe host driver reference it through 
the standard PHY API.

>> +- have-msi-inten-reg: Required for legacy iProc PCIe controllers that need the
>> +  MSI interrupt enable register to be set explicitly
>> +
>> +The Broadcom iProc PCie driver adapts the multi-domain structure, i.e., each
>> +interface has its own domain and therefore has its own device node
>> +Example:
>> +
>> +SoC specific DT Entry:
>> +
>> +       pcie0: pcie at 18012000 {
>> +               compatible = "brcm,iproc-pcie";
>> +               reg = <0x18012000 0x1000>,
>> +                       <0x18002000 0x1000>;
>
> I guess the addresses should be relative to the BCMA bus, and this node
> get moved under that. Please see Hauke's patch series, we've discussed
> this in great length already.
>

As Arend van Spriel pointed out in the previous discussion:

BCMA core is the bus driver for discoverable ARM AXI interconnect. Apart 
from that it also provides drivers for some cores. For the chips to be 
discoverable it needs additional IP logic.

Not all iProc family of SoCs have the additional IP logic and for those 
which don't, they cannot use the BCMA bus.

>> +               #interrupt-cells = <1>;
>> +               interrupts = <GIC_SPI 96 IRQ_TYPE_NONE>,
>> +                            <GIC_SPI 97 IRQ_TYPE_NONE>,
>> +                            <GIC_SPI 98 IRQ_TYPE_NONE>,
>> +                            <GIC_SPI 99 IRQ_TYPE_NONE>,
>> +                            <GIC_SPI 100 IRQ_TYPE_NONE>,
>> +                            <GIC_SPI 101 IRQ_TYPE_NONE>;
>
>
>
>> +               interrupt-map-mask = <0 0 0 0>;
>> +               interrupt-map = <0 0 0 0 &gic GIC_SPI 100 IRQ_TYPE_NONE>;
>
> This interrupt is also listed in the "interrupts" above, which is
> probably a mistake, unless the IRQ line is shared between all PCI
> devices and the PCI host itself.
>
interrupts are for MSI interrupt support and interrupt-map is for legacy 
INTx support. To my best knowledge, MSI and INTx cannot be used at the 
same time. "nvidia,tegra20-pcie.txt" and "rcar-pci.txt" have similar 
configurations.

>> +               bus-range = <0x00 0xFF>;
>> +
>> +               #address-cells = >;
>> +               #size-cells = <2>;
>> +               device_type = "pci";
>> +               ranges = <0x81000000 0 0          0x28000000 0 0x00010000   /* downstream I/O */
>> +                         0x82000000 0 0x20000000 0x20000000 0 0x04000000>; /* non-prefetchable memory */
>> +               phy-addr = <5>;
>> +       };
>>
>
> 	Arnd
>

Re: [PATCH v2 3/4] ARM: mach-bcm: Enable PCIe support for iProc

[Ray Jui]

On 12/12/2014 4:15 AM, Arnd Bergmann wrote:
> On Thursday 11 December 2014 18:36:56 Ray Jui wrote:
>> Enable PCIe driver support for Broadcom iProc family of SoCs by
>> selecting PCIE_IPROC
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>> ---
>>   arch/arm/mach-bcm/Kconfig |    1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
>> index aaeec78..a13a0b2 100644
>> --- a/arch/arm/mach-bcm/Kconfig
>> +++ b/arch/arm/mach-bcm/Kconfig
>> @@ -19,6 +19,7 @@ config ARCH_BCM_IPROC
>>   	select ARCH_REQUIRE_GPIOLIB
>>   	select ARM_AMBA
>>   	select PINCTRL
>> +	select PCIE_IPROC
>>   	help
>>   	  This enables support for systems based on Broadcom IPROC architected SoCs.
>>   	  The IPROC complex contains one or more ARM CPUs along with common
>>
>
> No, just enable it in multi_v7_defconfig and bcm_defconfig.
>
> 	Arnd
>
Or can I simply have the PCIE_IPROC default to y in 
drivers/pci/host/Kconfig? Note PCIE_IPROC depends on ARCH_BCM_IPROC. By 
defaulting it to y, it will be automatically enabled for all iProc 
family of SoCs.

Re: [PATCH v2 3/4] ARM: mach-bcm: Enable PCIe support for iProc

[Ray Jui]

On 12/12/2014 4:15 AM, Arnd Bergmann wrote:
> On Thursday 11 December 2014 18:36:56 Ray Jui wrote:
>> Enable PCIe driver support for Broadcom iProc family of SoCs by
>> selecting PCIE_IPROC
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>> ---
>>   arch/arm/mach-bcm/Kconfig |    1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
>> index aaeec78..a13a0b2 100644
>> --- a/arch/arm/mach-bcm/Kconfig
>> +++ b/arch/arm/mach-bcm/Kconfig
>> @@ -19,6 +19,7 @@ config ARCH_BCM_IPROC
>>   	select ARCH_REQUIRE_GPIOLIB
>>   	select ARM_AMBA
>>   	select PINCTRL
>> +	select PCIE_IPROC
>>   	help
>>   	  This enables support for systems based on Broadcom IPROC architected SoCs.
>>   	  The IPROC complex contains one or more ARM CPUs along with common
>>
>
> No, just enable it in multi_v7_defconfig and bcm_defconfig.
>
> 	Arnd
>
Or can I simply have the PCIE_IPROC default to y in 
drivers/pci/host/Kconfig? Note PCIE_IPROC depends on ARCH_BCM_IPROC. By 
defaulting it to y, it will be automatically enabled for all iProc 
family of SoCs.

[PATCH v2 3/4] ARM: mach-bcm: Enable PCIe support for iProc

[Ray Jui]

On 12/12/2014 4:15 AM, Arnd Bergmann wrote:
> On Thursday 11 December 2014 18:36:56 Ray Jui wrote:
>> Enable PCIe driver support for Broadcom iProc family of SoCs by
>> selecting PCIE_IPROC
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>> ---
>>   arch/arm/mach-bcm/Kconfig |    1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
>> index aaeec78..a13a0b2 100644
>> --- a/arch/arm/mach-bcm/Kconfig
>> +++ b/arch/arm/mach-bcm/Kconfig
>> @@ -19,6 +19,7 @@ config ARCH_BCM_IPROC
>>   	select ARCH_REQUIRE_GPIOLIB
>>   	select ARM_AMBA
>>   	select PINCTRL
>> +	select PCIE_IPROC
>>   	help
>>   	  This enables support for systems based on Broadcom IPROC architected SoCs.
>>   	  The IPROC complex contains one or more ARM CPUs along with common
>>
>
> No, just enable it in multi_v7_defconfig and bcm_defconfig.
>
> 	Arnd
>
Or can I simply have the PCIE_IPROC default to y in 
drivers/pci/host/Kconfig? Note PCIE_IPROC depends on ARCH_BCM_IPROC. By 
defaulting it to y, it will be automatically enabled for all iProc 
family of SoCs.

Re: [PATCH v2 3/4] ARM: mach-bcm: Enable PCIe support for iProc

[Arnd Bergmann]

On Friday 12 December 2014 08:56:19 Ray Jui wrote:
> >>
> >> diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
> >> index aaeec78..a13a0b2 100644
> >> --- a/arch/arm/mach-bcm/Kconfig
> >> +++ b/arch/arm/mach-bcm/Kconfig
> >> @@ -19,6 +19,7 @@ config ARCH_BCM_IPROC
> >>      select ARCH_REQUIRE_GPIOLIB
> >>      select ARM_AMBA
> >>      select PINCTRL
> >> +    select PCIE_IPROC
> >>      help
> >>        This enables support for systems based on Broadcom IPROC architected SoCs.
> >>        The IPROC complex contains one or more ARM CPUs along with common
> >>
> >
> > No, just enable it in multi_v7_defconfig and bcm_defconfig.
> >
> >       Arnd
> >
> Or can I simply have the PCIE_IPROC default to y in 
> drivers/pci/host/Kconfig? Note PCIE_IPROC depends on ARCH_BCM_IPROC. By 
> defaulting it to y, it will be automatically enabled for all iProc 
> family of SoCs.

I still think it's best not to turn it on automatically. The convention
for device drivers is to make them all optional.

What you can do however is to add

	depends on ARCH_BCM_IPROC || COMPILE_TEST

to the driver to do the reverse and not let the driver be turned on
unless IPROC is selected or you are just testing the build.
A lot of distros just turn on all drivers, so this way you wouldn't
accidentally enable it for a kernel that doesn't support IPROC.

	Arnd

[PATCH v2 3/4] ARM: mach-bcm: Enable PCIe support for iProc

[Arnd Bergmann]

On Friday 12 December 2014 08:56:19 Ray Jui wrote:
> >>
> >> diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
> >> index aaeec78..a13a0b2 100644
> >> --- a/arch/arm/mach-bcm/Kconfig
> >> +++ b/arch/arm/mach-bcm/Kconfig
> >> @@ -19,6 +19,7 @@ config ARCH_BCM_IPROC
> >>      select ARCH_REQUIRE_GPIOLIB
> >>      select ARM_AMBA
> >>      select PINCTRL
> >> +    select PCIE_IPROC
> >>      help
> >>        This enables support for systems based on Broadcom IPROC architected SoCs.
> >>        The IPROC complex contains one or more ARM CPUs along with common
> >>
> >
> > No, just enable it in multi_v7_defconfig and bcm_defconfig.
> >
> >       Arnd
> >
> Or can I simply have the PCIE_IPROC default to y in 
> drivers/pci/host/Kconfig? Note PCIE_IPROC depends on ARCH_BCM_IPROC. By 
> defaulting it to y, it will be automatically enabled for all iProc 
> family of SoCs.

I still think it's best not to turn it on automatically. The convention
for device drivers is to make them all optional.

What you can do however is to add

	depends on ARCH_BCM_IPROC || COMPILE_TEST

to the driver to do the reverse and not let the driver be turned on
unless IPROC is selected or you are just testing the build.
A lot of distros just turn on all drivers, so this way you wouldn't
accidentally enable it for a kernel that doesn't support IPROC.

	Arnd

Re: [PATCH v2 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Ray Jui]

On 12/12/2014 4:29 AM, Arnd Bergmann wrote:
> On Thursday 11 December 2014 18:36:55 Ray Jui wrote:
>> Add initial version of the Broadcom iProc PCIe driver. This driver
>> has been tested on NSP and Cygnus and is expected to work on all iProc
>> family of SoCs that deploys the same PCIe host controller
>>
>> The driver also supports MSI
>
> Overall, I'm not convinced it's worth continuing this driver. While it
> supports more features, Hauke's version seemed much cleaner, and I'd
> rather see his driver merged and have you add the additional features.
>
> Why did you drop him from Cc again?
>
In fact, Hauke is on the "to" list of all v2 patchset that I sent out. I 
added him to the "to" list because he mentioned during v1 patchset 
review that he'll help to test this on North Star.

Doesn't Hauke's driver depends on BCMA? In that case, how does it work 
on the SoCs that do not have the IP block to support BCMA?

>> +
>> +#define MII_MGMT_CTRL_OFFSET         0x000
>> +#define MII_MGMT_CTRL_MDCDIV_SHIFT   0
>> +#define MII_MGMT_CTRL_PRE_SHIFT      7
>> +#define MII_MGMT_CTRL_BUSY_SHIFT     8
>> +#define MII_MGMT_CTRL_EXT_SHIFT      9
>> +#define MII_MGMT_CTRL_BTP_SHIFT      10
>
> As mentioned, better move all the MII handling to a separate driver.
>
Agreed.

>> +struct iproc_pcie;
>> +
>> +/**
>> + * iProc MSI
>> + * @pcie: pointer to the iProc PCIe data structure
>> + * @irq_in_use: bitmap of MSI IRQs that are in use
>> + * @domain: MSI IRQ domain
>> + * @chip: MSI controller
>> + * @eq_page: memory page to store the iProc MSI event queue
>> + * @msi_page: memory page for MSI posted writes
>> + */
>> +struct iproc_msi {
>> +	struct iproc_pcie *pcie;
>> +	DECLARE_BITMAP(irq_in_use, MAX_IRQS);
>> +	struct irq_domain *domain;
>> +	struct msi_controller chip;
>> +	unsigned long eq_page;
>> +	unsigned long msi_page;
>> +};
>
> Same for MSI. I would assume that you will eventually have
> chips with this PCI core and a GICv2m or GICv3, so it would
> be better to reference the MSI controller through an msi-parent
> reference that can be replaced with a reference to the GIC.
>
I'll need to look into this in more details.

>> +
>> +	u32 phy_addr;
>
> struct phy *phy;
>
>> +	int irqs[MAX_IRQS];
>
> Please name these irqs individually according to what they do.
> The MSI IRQ should of course be moved to the MSI driver.
>
Will investigate more on MSI.

>> +	struct iproc_msi msi;
>> +};
>> +
>> +static inline int mdio_wait_idle(struct iproc_pcie *pcie)
>> +{
>> +	int timeout = MDIO_TIMEOUT_USEC;
>> +
>> +	while (readl(pcie->mii + MII_MGMT_CTRL_OFFSET) &
>> +			(1 << MII_MGMT_CTRL_BUSY_SHIFT)) {
>> +		udelay(1);
>> +		if (timeout-- <= 0)
>> +			return -EBUSY;
>> +	}
>> +	return 0;
>> +}
>
> Better use ktime_get()/ktime_add_ns()/ktime_before() loop here
> to do an accurate timeout.
>
Sure. Will do that in the PHY driver.

>> +static void iproc_pcie_reset(struct iproc_pcie *pcie)
>> +{
>> +	u32 val;
>> +
>> +	/* send a downstream reset */
>> +	val = EP_MODE_SURVIVE_PERST | RC_PCIE_RST_OUTPUT;
>> +	writel(val, pcie->reg + CLK_CONTROL_OFFSET);
>> +	udelay(250);
>> +	val &= ~EP_MODE_SURVIVE_PERST;
>> +	writel(val, pcie->reg + CLK_CONTROL_OFFSET);
>> +	mdelay(250);
>> +}
>
> 250ms delay is not acceptable. Please find a way to call this function
> from a context in which you can sleep.
>
This is called from driver probe, where runs in the process context 
where you can sleep. Is my understanding correct? I can change mdelay to 
msleep so the CPU does not waste time spinning.

>> +static int iproc_pcie_check_link(struct iproc_pcie *pcie)
>> +{
>> +	int ret;
>> +	u8 nlw;
>> +	u16 pos, tmp16;
>> +	u32 val;
>> +	struct pci_sys_data sys;
>> +	struct pci_bus bus;
>> +
>> +	val = readl(pcie->reg + PCIE_LINK_STATUS_OFFSET);
>> +	dev_dbg(pcie->dev, "link status: 0x%08x\n", val);
>> +
>> +	val = readl(pcie->reg + STRAP_STATUS_OFFSET);
>> +	dev_dbg(pcie->dev, "strap status: 0x%08x\n", val);
>> +
>> +	memset(&sys, 0, sizeof(sys));
>> +	memset(&bus, 0, sizeof(bus));
>> +
>> +	bus.number = 0;
>> +	bus.ops = &iproc_pcie_ops;
>> +	bus.sysdata = &sys;
>> +	sys.private_data = pcie;
>> +
>> +	ret = iproc_pci_read_conf(&bus, 0, PCI_HEADER_TYPE, 1, &val);
>> +	if (ret != PCIBIOS_SUCCESSFUL || val != PCI_HEADER_TYPE_BRIDGE) {
>> +		dev_err(pcie->dev, "in EP mode, val=0x08%x\n", val);
>> +		return -EFAULT;
>> +	}
>
> Remove the fake pci_bus hack and just read the config space directly.
>
Will look into this in more details.

>> +	if (nlw == 0) {
>> +		/* try GEN 1 link speed */
>> +#define PCI_LINK_STATUS_CTRL_2_OFFSET 0xDC
>> +#define PCI_TARGET_LINK_SPEED_MASK    0xF
>> +#define PCI_TARGET_LINK_SPEED_GEN2    0x2
>> +#define PCI_TARGET_LINK_SPEED_GEN1    0x1
>> +		pci_bus_read_config_dword(&bus, 0,
>> +				PCI_LINK_STATUS_CTRL_2_OFFSET, &val);
>> +		if ((val & PCI_TARGET_LINK_SPEED_MASK) ==
>> +				PCI_TARGET_LINK_SPEED_GEN2) {
>> +			val &= ~PCI_TARGET_LINK_SPEED_MASK;
>> +			val |= PCI_TARGET_LINK_SPEED_GEN1;
>> +			pci_bus_write_config_dword(&bus, 0,
>> +					PCI_LINK_STATUS_CTRL_2_OFFSET, val);
>> +			pci_bus_read_config_dword(&bus, 0,
>> +					PCI_LINK_STATUS_CTRL_2_OFFSET, &val);
>> +			mdelay(100);
>
> Too much delay.
>
Need to confirm with the ASIC engineer. The delay may be what's needed.

>> +static struct hw_pci hw;
>
> Put this on the stack.
>
>> +
>> +	/* Get the PCI memory ranges from DT */
>> +	for_each_of_pci_range(&parser, &range) {
>> +		of_pci_range_to_resource(&range, np, &res);
>> +
>> +		switch (res.flags & IORESOURCE_TYPE_BITS) {
>> +		case IORESOURCE_IO:
>> +			memcpy(&pcie->io, &res, sizeof(res));
>> +			pcie->io.name = "I/O";
>> +			break;
>> +
>> +		case IORESOURCE_MEM:
>> +			memcpy(&pcie->mem, &res, sizeof(res));
>> +			pcie->mem.name = "MEM";
>> +			break;
>> +		}
>> +	}
>
> I think you need to request all the resources here, including the physical
> I/O space window.
>
Okay.

>> +static struct platform_driver iproc_pcie_driver = {
>> +	.driver = {
>> +		.owner = THIS_MODULE,
>> +		.name = "iproc-pcie",
>> +		.of_match_table =
>> +		   of_match_ptr(iproc_pcie_of_match_table),
>> +	},
>> +};
>
> Make this a bcma_driver.
>
Cannot be a bcma driver. Reason explained above and in PATCH v2 1/4 emails.

>> +static int __init iproc_pcie_init(void)
>> +{
>> +	return platform_driver_probe(&iproc_pcie_driver,
>> +			iproc_pcie_probe);
>> +}
>> +subsys_initcall(iproc_pcie_init);
>
> module_init()? Doesn't seem necessary to have this early.
>
> 	Arnd
>
Will look into this. Forgot why we use subsys_initcall here...

Re: [PATCH v2 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Ray Jui]

On 12/12/2014 4:29 AM, Arnd Bergmann wrote:
> On Thursday 11 December 2014 18:36:55 Ray Jui wrote:
>> Add initial version of the Broadcom iProc PCIe driver. This driver
>> has been tested on NSP and Cygnus and is expected to work on all iProc
>> family of SoCs that deploys the same PCIe host controller
>>
>> The driver also supports MSI
>
> Overall, I'm not convinced it's worth continuing this driver. While it
> supports more features, Hauke's version seemed much cleaner, and I'd
> rather see his driver merged and have you add the additional features.
>
> Why did you drop him from Cc again?
>
In fact, Hauke is on the "to" list of all v2 patchset that I sent out. I 
added him to the "to" list because he mentioned during v1 patchset 
review that he'll help to test this on North Star.

Doesn't Hauke's driver depends on BCMA? In that case, how does it work 
on the SoCs that do not have the IP block to support BCMA?

>> +
>> +#define MII_MGMT_CTRL_OFFSET         0x000
>> +#define MII_MGMT_CTRL_MDCDIV_SHIFT   0
>> +#define MII_MGMT_CTRL_PRE_SHIFT      7
>> +#define MII_MGMT_CTRL_BUSY_SHIFT     8
>> +#define MII_MGMT_CTRL_EXT_SHIFT      9
>> +#define MII_MGMT_CTRL_BTP_SHIFT      10
>
> As mentioned, better move all the MII handling to a separate driver.
>
Agreed.

>> +struct iproc_pcie;
>> +
>> +/**
>> + * iProc MSI
>> + * @pcie: pointer to the iProc PCIe data structure
>> + * @irq_in_use: bitmap of MSI IRQs that are in use
>> + * @domain: MSI IRQ domain
>> + * @chip: MSI controller
>> + * @eq_page: memory page to store the iProc MSI event queue
>> + * @msi_page: memory page for MSI posted writes
>> + */
>> +struct iproc_msi {
>> +	struct iproc_pcie *pcie;
>> +	DECLARE_BITMAP(irq_in_use, MAX_IRQS);
>> +	struct irq_domain *domain;
>> +	struct msi_controller chip;
>> +	unsigned long eq_page;
>> +	unsigned long msi_page;
>> +};
>
> Same for MSI. I would assume that you will eventually have
> chips with this PCI core and a GICv2m or GICv3, so it would
> be better to reference the MSI controller through an msi-parent
> reference that can be replaced with a reference to the GIC.
>
I'll need to look into this in more details.

>> +
>> +	u32 phy_addr;
>
> struct phy *phy;
>
>> +	int irqs[MAX_IRQS];
>
> Please name these irqs individually according to what they do.
> The MSI IRQ should of course be moved to the MSI driver.
>
Will investigate more on MSI.

>> +	struct iproc_msi msi;
>> +};
>> +
>> +static inline int mdio_wait_idle(struct iproc_pcie *pcie)
>> +{
>> +	int timeout = MDIO_TIMEOUT_USEC;
>> +
>> +	while (readl(pcie->mii + MII_MGMT_CTRL_OFFSET) &
>> +			(1 << MII_MGMT_CTRL_BUSY_SHIFT)) {
>> +		udelay(1);
>> +		if (timeout-- <= 0)
>> +			return -EBUSY;
>> +	}
>> +	return 0;
>> +}
>
> Better use ktime_get()/ktime_add_ns()/ktime_before() loop here
> to do an accurate timeout.
>
Sure. Will do that in the PHY driver.

>> +static void iproc_pcie_reset(struct iproc_pcie *pcie)
>> +{
>> +	u32 val;
>> +
>> +	/* send a downstream reset */
>> +	val = EP_MODE_SURVIVE_PERST | RC_PCIE_RST_OUTPUT;
>> +	writel(val, pcie->reg + CLK_CONTROL_OFFSET);
>> +	udelay(250);
>> +	val &= ~EP_MODE_SURVIVE_PERST;
>> +	writel(val, pcie->reg + CLK_CONTROL_OFFSET);
>> +	mdelay(250);
>> +}
>
> 250ms delay is not acceptable. Please find a way to call this function
> from a context in which you can sleep.
>
This is called from driver probe, where runs in the process context 
where you can sleep. Is my understanding correct? I can change mdelay to 
msleep so the CPU does not waste time spinning.

>> +static int iproc_pcie_check_link(struct iproc_pcie *pcie)
>> +{
>> +	int ret;
>> +	u8 nlw;
>> +	u16 pos, tmp16;
>> +	u32 val;
>> +	struct pci_sys_data sys;
>> +	struct pci_bus bus;
>> +
>> +	val = readl(pcie->reg + PCIE_LINK_STATUS_OFFSET);
>> +	dev_dbg(pcie->dev, "link status: 0x%08x\n", val);
>> +
>> +	val = readl(pcie->reg + STRAP_STATUS_OFFSET);
>> +	dev_dbg(pcie->dev, "strap status: 0x%08x\n", val);
>> +
>> +	memset(&sys, 0, sizeof(sys));
>> +	memset(&bus, 0, sizeof(bus));
>> +
>> +	bus.number = 0;
>> +	bus.ops = &iproc_pcie_ops;
>> +	bus.sysdata = &sys;
>> +	sys.private_data = pcie;
>> +
>> +	ret = iproc_pci_read_conf(&bus, 0, PCI_HEADER_TYPE, 1, &val);
>> +	if (ret != PCIBIOS_SUCCESSFUL || val != PCI_HEADER_TYPE_BRIDGE) {
>> +		dev_err(pcie->dev, "in EP mode, val=0x08%x\n", val);
>> +		return -EFAULT;
>> +	}
>
> Remove the fake pci_bus hack and just read the config space directly.
>
Will look into this in more details.

>> +	if (nlw == 0) {
>> +		/* try GEN 1 link speed */
>> +#define PCI_LINK_STATUS_CTRL_2_OFFSET 0xDC
>> +#define PCI_TARGET_LINK_SPEED_MASK    0xF
>> +#define PCI_TARGET_LINK_SPEED_GEN2    0x2
>> +#define PCI_TARGET_LINK_SPEED_GEN1    0x1
>> +		pci_bus_read_config_dword(&bus, 0,
>> +				PCI_LINK_STATUS_CTRL_2_OFFSET, &val);
>> +		if ((val & PCI_TARGET_LINK_SPEED_MASK) ==
>> +				PCI_TARGET_LINK_SPEED_GEN2) {
>> +			val &= ~PCI_TARGET_LINK_SPEED_MASK;
>> +			val |= PCI_TARGET_LINK_SPEED_GEN1;
>> +			pci_bus_write_config_dword(&bus, 0,
>> +					PCI_LINK_STATUS_CTRL_2_OFFSET, val);
>> +			pci_bus_read_config_dword(&bus, 0,
>> +					PCI_LINK_STATUS_CTRL_2_OFFSET, &val);
>> +			mdelay(100);
>
> Too much delay.
>
Need to confirm with the ASIC engineer. The delay may be what's needed.

>> +static struct hw_pci hw;
>
> Put this on the stack.
>
>> +
>> +	/* Get the PCI memory ranges from DT */
>> +	for_each_of_pci_range(&parser, &range) {
>> +		of_pci_range_to_resource(&range, np, &res);
>> +
>> +		switch (res.flags & IORESOURCE_TYPE_BITS) {
>> +		case IORESOURCE_IO:
>> +			memcpy(&pcie->io, &res, sizeof(res));
>> +			pcie->io.name = "I/O";
>> +			break;
>> +
>> +		case IORESOURCE_MEM:
>> +			memcpy(&pcie->mem, &res, sizeof(res));
>> +			pcie->mem.name = "MEM";
>> +			break;
>> +		}
>> +	}
>
> I think you need to request all the resources here, including the physical
> I/O space window.
>
Okay.

>> +static struct platform_driver iproc_pcie_driver = {
>> +	.driver = {
>> +		.owner = THIS_MODULE,
>> +		.name = "iproc-pcie",
>> +		.of_match_table =
>> +		   of_match_ptr(iproc_pcie_of_match_table),
>> +	},
>> +};
>
> Make this a bcma_driver.
>
Cannot be a bcma driver. Reason explained above and in PATCH v2 1/4 emails.

>> +static int __init iproc_pcie_init(void)
>> +{
>> +	return platform_driver_probe(&iproc_pcie_driver,
>> +			iproc_pcie_probe);
>> +}
>> +subsys_initcall(iproc_pcie_init);
>
> module_init()? Doesn't seem necessary to have this early.
>
> 	Arnd
>
Will look into this. Forgot why we use subsys_initcall here...
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[PATCH v2 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Ray Jui]

On 12/12/2014 4:29 AM, Arnd Bergmann wrote:
> On Thursday 11 December 2014 18:36:55 Ray Jui wrote:
>> Add initial version of the Broadcom iProc PCIe driver. This driver
>> has been tested on NSP and Cygnus and is expected to work on all iProc
>> family of SoCs that deploys the same PCIe host controller
>>
>> The driver also supports MSI
>
> Overall, I'm not convinced it's worth continuing this driver. While it
> supports more features, Hauke's version seemed much cleaner, and I'd
> rather see his driver merged and have you add the additional features.
>
> Why did you drop him from Cc again?
>
In fact, Hauke is on the "to" list of all v2 patchset that I sent out. I 
added him to the "to" list because he mentioned during v1 patchset 
review that he'll help to test this on North Star.

Doesn't Hauke's driver depends on BCMA? In that case, how does it work 
on the SoCs that do not have the IP block to support BCMA?

>> +
>> +#define MII_MGMT_CTRL_OFFSET         0x000
>> +#define MII_MGMT_CTRL_MDCDIV_SHIFT   0
>> +#define MII_MGMT_CTRL_PRE_SHIFT      7
>> +#define MII_MGMT_CTRL_BUSY_SHIFT     8
>> +#define MII_MGMT_CTRL_EXT_SHIFT      9
>> +#define MII_MGMT_CTRL_BTP_SHIFT      10
>
> As mentioned, better move all the MII handling to a separate driver.
>
Agreed.

>> +struct iproc_pcie;
>> +
>> +/**
>> + * iProc MSI
>> + * @pcie: pointer to the iProc PCIe data structure
>> + * @irq_in_use: bitmap of MSI IRQs that are in use
>> + * @domain: MSI IRQ domain
>> + * @chip: MSI controller
>> + * @eq_page: memory page to store the iProc MSI event queue
>> + * @msi_page: memory page for MSI posted writes
>> + */
>> +struct iproc_msi {
>> +	struct iproc_pcie *pcie;
>> +	DECLARE_BITMAP(irq_in_use, MAX_IRQS);
>> +	struct irq_domain *domain;
>> +	struct msi_controller chip;
>> +	unsigned long eq_page;
>> +	unsigned long msi_page;
>> +};
>
> Same for MSI. I would assume that you will eventually have
> chips with this PCI core and a GICv2m or GICv3, so it would
> be better to reference the MSI controller through an msi-parent
> reference that can be replaced with a reference to the GIC.
>
I'll need to look into this in more details.

>> +
>> +	u32 phy_addr;
>
> struct phy *phy;
>
>> +	int irqs[MAX_IRQS];
>
> Please name these irqs individually according to what they do.
> The MSI IRQ should of course be moved to the MSI driver.
>
Will investigate more on MSI.

>> +	struct iproc_msi msi;
>> +};
>> +
>> +static inline int mdio_wait_idle(struct iproc_pcie *pcie)
>> +{
>> +	int timeout = MDIO_TIMEOUT_USEC;
>> +
>> +	while (readl(pcie->mii + MII_MGMT_CTRL_OFFSET) &
>> +			(1 << MII_MGMT_CTRL_BUSY_SHIFT)) {
>> +		udelay(1);
>> +		if (timeout-- <= 0)
>> +			return -EBUSY;
>> +	}
>> +	return 0;
>> +}
>
> Better use ktime_get()/ktime_add_ns()/ktime_before() loop here
> to do an accurate timeout.
>
Sure. Will do that in the PHY driver.

>> +static void iproc_pcie_reset(struct iproc_pcie *pcie)
>> +{
>> +	u32 val;
>> +
>> +	/* send a downstream reset */
>> +	val = EP_MODE_SURVIVE_PERST | RC_PCIE_RST_OUTPUT;
>> +	writel(val, pcie->reg + CLK_CONTROL_OFFSET);
>> +	udelay(250);
>> +	val &= ~EP_MODE_SURVIVE_PERST;
>> +	writel(val, pcie->reg + CLK_CONTROL_OFFSET);
>> +	mdelay(250);
>> +}
>
> 250ms delay is not acceptable. Please find a way to call this function
> from a context in which you can sleep.
>
This is called from driver probe, where runs in the process context 
where you can sleep. Is my understanding correct? I can change mdelay to 
msleep so the CPU does not waste time spinning.

>> +static int iproc_pcie_check_link(struct iproc_pcie *pcie)
>> +{
>> +	int ret;
>> +	u8 nlw;
>> +	u16 pos, tmp16;
>> +	u32 val;
>> +	struct pci_sys_data sys;
>> +	struct pci_bus bus;
>> +
>> +	val = readl(pcie->reg + PCIE_LINK_STATUS_OFFSET);
>> +	dev_dbg(pcie->dev, "link status: 0x%08x\n", val);
>> +
>> +	val = readl(pcie->reg + STRAP_STATUS_OFFSET);
>> +	dev_dbg(pcie->dev, "strap status: 0x%08x\n", val);
>> +
>> +	memset(&sys, 0, sizeof(sys));
>> +	memset(&bus, 0, sizeof(bus));
>> +
>> +	bus.number = 0;
>> +	bus.ops = &iproc_pcie_ops;
>> +	bus.sysdata = &sys;
>> +	sys.private_data = pcie;
>> +
>> +	ret = iproc_pci_read_conf(&bus, 0, PCI_HEADER_TYPE, 1, &val);
>> +	if (ret != PCIBIOS_SUCCESSFUL || val != PCI_HEADER_TYPE_BRIDGE) {
>> +		dev_err(pcie->dev, "in EP mode, val=0x08%x\n", val);
>> +		return -EFAULT;
>> +	}
>
> Remove the fake pci_bus hack and just read the config space directly.
>
Will look into this in more details.

>> +	if (nlw == 0) {
>> +		/* try GEN 1 link speed */
>> +#define PCI_LINK_STATUS_CTRL_2_OFFSET 0xDC
>> +#define PCI_TARGET_LINK_SPEED_MASK    0xF
>> +#define PCI_TARGET_LINK_SPEED_GEN2    0x2
>> +#define PCI_TARGET_LINK_SPEED_GEN1    0x1
>> +		pci_bus_read_config_dword(&bus, 0,
>> +				PCI_LINK_STATUS_CTRL_2_OFFSET, &val);
>> +		if ((val & PCI_TARGET_LINK_SPEED_MASK) ==
>> +				PCI_TARGET_LINK_SPEED_GEN2) {
>> +			val &= ~PCI_TARGET_LINK_SPEED_MASK;
>> +			val |= PCI_TARGET_LINK_SPEED_GEN1;
>> +			pci_bus_write_config_dword(&bus, 0,
>> +					PCI_LINK_STATUS_CTRL_2_OFFSET, val);
>> +			pci_bus_read_config_dword(&bus, 0,
>> +					PCI_LINK_STATUS_CTRL_2_OFFSET, &val);
>> +			mdelay(100);
>
> Too much delay.
>
Need to confirm with the ASIC engineer. The delay may be what's needed.

>> +static struct hw_pci hw;
>
> Put this on the stack.
>
>> +
>> +	/* Get the PCI memory ranges from DT */
>> +	for_each_of_pci_range(&parser, &range) {
>> +		of_pci_range_to_resource(&range, np, &res);
>> +
>> +		switch (res.flags & IORESOURCE_TYPE_BITS) {
>> +		case IORESOURCE_IO:
>> +			memcpy(&pcie->io, &res, sizeof(res));
>> +			pcie->io.name = "I/O";
>> +			break;
>> +
>> +		case IORESOURCE_MEM:
>> +			memcpy(&pcie->mem, &res, sizeof(res));
>> +			pcie->mem.name = "MEM";
>> +			break;
>> +		}
>> +	}
>
> I think you need to request all the resources here, including the physical
> I/O space window.
>
Okay.

>> +static struct platform_driver iproc_pcie_driver = {
>> +	.driver = {
>> +		.owner = THIS_MODULE,
>> +		.name = "iproc-pcie",
>> +		.of_match_table =
>> +		   of_match_ptr(iproc_pcie_of_match_table),
>> +	},
>> +};
>
> Make this a bcma_driver.
>
Cannot be a bcma driver. Reason explained above and in PATCH v2 1/4 emails.

>> +static int __init iproc_pcie_init(void)
>> +{
>> +	return platform_driver_probe(&iproc_pcie_driver,
>> +			iproc_pcie_probe);
>> +}
>> +subsys_initcall(iproc_pcie_init);
>
> module_init()? Doesn't seem necessary to have this early.
>
> 	Arnd
>
Will look into this. Forgot why we use subsys_initcall here...

Re: [PATCH v2 3/4] ARM: mach-bcm: Enable PCIe support for iProc

[Ray Jui]

On 12/12/2014 9:02 AM, Arnd Bergmann wrote:
> On Friday 12 December 2014 08:56:19 Ray Jui wrote:
>>>>
>>>> diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
>>>> index aaeec78..a13a0b2 100644
>>>> --- a/arch/arm/mach-bcm/Kconfig
>>>> +++ b/arch/arm/mach-bcm/Kconfig
>>>> @@ -19,6 +19,7 @@ config ARCH_BCM_IPROC
>>>>       select ARCH_REQUIRE_GPIOLIB
>>>>       select ARM_AMBA
>>>>       select PINCTRL
>>>> +    select PCIE_IPROC
>>>>       help
>>>>         This enables support for systems based on Broadcom IPROC architected SoCs.
>>>>         The IPROC complex contains one or more ARM CPUs along with common
>>>>
>>>
>>> No, just enable it in multi_v7_defconfig and bcm_defconfig.
>>>
>>>        Arnd
>>>
>> Or can I simply have the PCIE_IPROC default to y in
>> drivers/pci/host/Kconfig? Note PCIE_IPROC depends on ARCH_BCM_IPROC. By
>> defaulting it to y, it will be automatically enabled for all iProc
>> family of SoCs.
>
> I still think it's best not to turn it on automatically. The convention
> for device drivers is to make them all optional.
>
> What you can do however is to add
>
> 	depends on ARCH_BCM_IPROC || COMPILE_TEST
>
> to the driver to do the reverse and not let the driver be turned on
> unless IPROC is selected or you are just testing the build.
> A lot of distros just turn on all drivers, so this way you wouldn't
> accidentally enable it for a kernel that doesn't support IPROC.
>
> 	Arnd
>
Okay I'll do that. Thanks.

Re: [PATCH v2 3/4] ARM: mach-bcm: Enable PCIe support for iProc

[Ray Jui]

On 12/12/2014 9:02 AM, Arnd Bergmann wrote:
> On Friday 12 December 2014 08:56:19 Ray Jui wrote:
>>>>
>>>> diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
>>>> index aaeec78..a13a0b2 100644
>>>> --- a/arch/arm/mach-bcm/Kconfig
>>>> +++ b/arch/arm/mach-bcm/Kconfig
>>>> @@ -19,6 +19,7 @@ config ARCH_BCM_IPROC
>>>>       select ARCH_REQUIRE_GPIOLIB
>>>>       select ARM_AMBA
>>>>       select PINCTRL
>>>> +    select PCIE_IPROC
>>>>       help
>>>>         This enables support for systems based on Broadcom IPROC architected SoCs.
>>>>         The IPROC complex contains one or more ARM CPUs along with common
>>>>
>>>
>>> No, just enable it in multi_v7_defconfig and bcm_defconfig.
>>>
>>>        Arnd
>>>
>> Or can I simply have the PCIE_IPROC default to y in
>> drivers/pci/host/Kconfig? Note PCIE_IPROC depends on ARCH_BCM_IPROC. By
>> defaulting it to y, it will be automatically enabled for all iProc
>> family of SoCs.
>
> I still think it's best not to turn it on automatically. The convention
> for device drivers is to make them all optional.
>
> What you can do however is to add
>
> 	depends on ARCH_BCM_IPROC || COMPILE_TEST
>
> to the driver to do the reverse and not let the driver be turned on
> unless IPROC is selected or you are just testing the build.
> A lot of distros just turn on all drivers, so this way you wouldn't
> accidentally enable it for a kernel that doesn't support IPROC.
>
> 	Arnd
>
Okay I'll do that. Thanks.

[PATCH v2 3/4] ARM: mach-bcm: Enable PCIe support for iProc

[Ray Jui]

On 12/12/2014 9:02 AM, Arnd Bergmann wrote:
> On Friday 12 December 2014 08:56:19 Ray Jui wrote:
>>>>
>>>> diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
>>>> index aaeec78..a13a0b2 100644
>>>> --- a/arch/arm/mach-bcm/Kconfig
>>>> +++ b/arch/arm/mach-bcm/Kconfig
>>>> @@ -19,6 +19,7 @@ config ARCH_BCM_IPROC
>>>>       select ARCH_REQUIRE_GPIOLIB
>>>>       select ARM_AMBA
>>>>       select PINCTRL
>>>> +    select PCIE_IPROC
>>>>       help
>>>>         This enables support for systems based on Broadcom IPROC architected SoCs.
>>>>         The IPROC complex contains one or more ARM CPUs along with common
>>>>
>>>
>>> No, just enable it in multi_v7_defconfig and bcm_defconfig.
>>>
>>>        Arnd
>>>
>> Or can I simply have the PCIE_IPROC default to y in
>> drivers/pci/host/Kconfig? Note PCIE_IPROC depends on ARCH_BCM_IPROC. By
>> defaulting it to y, it will be automatically enabled for all iProc
>> family of SoCs.
>
> I still think it's best not to turn it on automatically. The convention
> for device drivers is to make them all optional.
>
> What you can do however is to add
>
> 	depends on ARCH_BCM_IPROC || COMPILE_TEST
>
> to the driver to do the reverse and not let the driver be turned on
> unless IPROC is selected or you are just testing the build.
> A lot of distros just turn on all drivers, so this way you wouldn't
> accidentally enable it for a kernel that doesn't support IPROC.
>
> 	Arnd
>
Okay I'll do that. Thanks.

Re: [PATCH v2 1/4] pci: iProc: define Broadcom iProc PCIe binding

[Arnd Bergmann]

On Friday 12 December 2014 08:53:44 Ray Jui wrote:
> 
> On 12/12/2014 4:14 AM, Arnd Bergmann wrote:
> > On Thursday 11 December 2014 18:36:54 Ray Jui wrote:
> >> index 0000000..040bc0f
> >> --- /dev/null
> >> +++ b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
> >> @@ -0,0 +1,74 @@
> >> +* Broadcom iProc PCIe controller
> >> +
> >> +Required properties:
> >> +- compatible: Must be "brcm,iproc-pcie"
> >> +- reg: base address and length of the PCIe controller and the MDIO interface
> >> +  that controls the PCIe PHY
> >> +- #interrupt-cells: set to <1>
> >> +- interrupts: interrupt IDs
> >
> > How many, and what are they?
> >
> Different iProc SoCs might have different number of interrupts. I'll 
> elaborate more on the next patch.

Ok.

> >> +- interrupt-map-mask and interrupt-map, standard PCI properties to define the
> >> +  mapping of the PCIe interface to interrupt numbers
> >> +- bus-range: PCI bus numbers covered
> >> +- #address-cells: set to <3>
> >> +- #size-cells: set to <2>
> >> +- device_type: set to "pci"
> >> +- ranges: ranges for the PCI memory and I/O regions
> >> +- phy-addr: MDC/MDIO adddress of the PCIe PHY
> >
> > It looks like the phy controller is separate from the PCI controller,
> > and you even list the same register range for both PHYs. Better make
> > that a separate driver and put the phy address into the "phys" reference.
> >
> Okay. In this case, I need to create a separate PHY driver under the 
> drivers/phy directory and have the PCIe host driver reference it through 
> the standard PHY API.

Yes, that is what I meant. In particular, that has the advantage of letting
you reuse the two drivers separately if some new SoC comes up that uses
one but not the other. A lot of PHY implementations can support multiple
protocols (e.g. pcie and usb3), but I don't know if yours does.

> >> +- have-msi-inten-reg: Required for legacy iProc PCIe controllers that need the
> >> +  MSI interrupt enable register to be set explicitly
> >> +
> >> +The Broadcom iProc PCie driver adapts the multi-domain structure, i.e., each
> >> +interface has its own domain and therefore has its own device node
> >> +Example:
> >> +
> >> +SoC specific DT Entry:
> >> +
> >> +       pcie0: pcie@18012000 {
> >> +               compatible = "brcm,iproc-pcie";
> >> +               reg = <0x18012000 0x1000>,
> >> +                       <0x18002000 0x1000>;
> >
> > I guess the addresses should be relative to the BCMA bus, and this node
> > get moved under that. Please see Hauke's patch series, we've discussed
> > this in great length already.
> >
> 
> As Arend van Spriel pointed out in the previous discussion:
> 
> BCMA core is the bus driver for discoverable ARM AXI interconnect. Apart 
> from that it also provides drivers for some cores. For the chips to be 
> discoverable it needs additional IP logic.
> 
> Not all iProc family of SoCs have the additional IP logic and for those 
> which don't, they cannot use the BCMA bus.

Ok, but the one from your example almost certainly does because the
addresses are exactly the same ones as on bcm53xx.

The same problem likely occurs on other peripherals, not just PCI,
so we will have to come up with a way to have a common driver for
bcma_bus and platform_bus for USB, SPI, brcmsmac, and likely others
too.

> >> +               #interrupt-cells = <1>;
> >> +               interrupts = <GIC_SPI 96 IRQ_TYPE_NONE>,
> >> +                            <GIC_SPI 97 IRQ_TYPE_NONE>,
> >> +                            <GIC_SPI 98 IRQ_TYPE_NONE>,
> >> +                            <GIC_SPI 99 IRQ_TYPE_NONE>,
> >> +                            <GIC_SPI 100 IRQ_TYPE_NONE>,
> >> +                            <GIC_SPI 101 IRQ_TYPE_NONE>;
> >
> >
> >
> >> +               interrupt-map-mask = <0 0 0 0>;
> >> +               interrupt-map = <0 0 0 0 &gic GIC_SPI 100 IRQ_TYPE_NONE>;
> >
> > This interrupt is also listed in the "interrupts" above, which is
> > probably a mistake, unless the IRQ line is shared between all PCI
> > devices and the PCI host itself.
> >
> interrupts are for MSI interrupt support and interrupt-map is for legacy 
> INTx support. To my best knowledge, MSI and INTx cannot be used at the 
> same time. "nvidia,tegra20-pcie.txt" and "rcar-pci.txt" have similar 
> configurations.

Linux drivers will absolutely use MSI and legacy interrupts together, because
some drivers don't support MSI and others enable it unconditionally.

In both your examples (tegra and rcar), the interrupts that share the same
number are auxiliary and are correctly used with IRQF_SHARED, so that works.
If a device MSI just maps to a host IRQ however, you wouldn't be able to
use IRQF_SHARED.

	Arnd

[PATCH v2 1/4] pci: iProc: define Broadcom iProc PCIe binding

[Arnd Bergmann]

On Friday 12 December 2014 08:53:44 Ray Jui wrote:
> 
> On 12/12/2014 4:14 AM, Arnd Bergmann wrote:
> > On Thursday 11 December 2014 18:36:54 Ray Jui wrote:
> >> index 0000000..040bc0f
> >> --- /dev/null
> >> +++ b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
> >> @@ -0,0 +1,74 @@
> >> +* Broadcom iProc PCIe controller
> >> +
> >> +Required properties:
> >> +- compatible: Must be "brcm,iproc-pcie"
> >> +- reg: base address and length of the PCIe controller and the MDIO interface
> >> +  that controls the PCIe PHY
> >> +- #interrupt-cells: set to <1>
> >> +- interrupts: interrupt IDs
> >
> > How many, and what are they?
> >
> Different iProc SoCs might have different number of interrupts. I'll 
> elaborate more on the next patch.

Ok.

> >> +- interrupt-map-mask and interrupt-map, standard PCI properties to define the
> >> +  mapping of the PCIe interface to interrupt numbers
> >> +- bus-range: PCI bus numbers covered
> >> +- #address-cells: set to <3>
> >> +- #size-cells: set to <2>
> >> +- device_type: set to "pci"
> >> +- ranges: ranges for the PCI memory and I/O regions
> >> +- phy-addr: MDC/MDIO adddress of the PCIe PHY
> >
> > It looks like the phy controller is separate from the PCI controller,
> > and you even list the same register range for both PHYs. Better make
> > that a separate driver and put the phy address into the "phys" reference.
> >
> Okay. In this case, I need to create a separate PHY driver under the 
> drivers/phy directory and have the PCIe host driver reference it through 
> the standard PHY API.

Yes, that is what I meant. In particular, that has the advantage of letting
you reuse the two drivers separately if some new SoC comes up that uses
one but not the other. A lot of PHY implementations can support multiple
protocols (e.g. pcie and usb3), but I don't know if yours does.

> >> +- have-msi-inten-reg: Required for legacy iProc PCIe controllers that need the
> >> +  MSI interrupt enable register to be set explicitly
> >> +
> >> +The Broadcom iProc PCie driver adapts the multi-domain structure, i.e., each
> >> +interface has its own domain and therefore has its own device node
> >> +Example:
> >> +
> >> +SoC specific DT Entry:
> >> +
> >> +       pcie0: pcie at 18012000 {
> >> +               compatible = "brcm,iproc-pcie";
> >> +               reg = <0x18012000 0x1000>,
> >> +                       <0x18002000 0x1000>;
> >
> > I guess the addresses should be relative to the BCMA bus, and this node
> > get moved under that. Please see Hauke's patch series, we've discussed
> > this in great length already.
> >
> 
> As Arend van Spriel pointed out in the previous discussion:
> 
> BCMA core is the bus driver for discoverable ARM AXI interconnect. Apart 
> from that it also provides drivers for some cores. For the chips to be 
> discoverable it needs additional IP logic.
> 
> Not all iProc family of SoCs have the additional IP logic and for those 
> which don't, they cannot use the BCMA bus.

Ok, but the one from your example almost certainly does because the
addresses are exactly the same ones as on bcm53xx.

The same problem likely occurs on other peripherals, not just PCI,
so we will have to come up with a way to have a common driver for
bcma_bus and platform_bus for USB, SPI, brcmsmac, and likely others
too.

> >> +               #interrupt-cells = <1>;
> >> +               interrupts = <GIC_SPI 96 IRQ_TYPE_NONE>,
> >> +                            <GIC_SPI 97 IRQ_TYPE_NONE>,
> >> +                            <GIC_SPI 98 IRQ_TYPE_NONE>,
> >> +                            <GIC_SPI 99 IRQ_TYPE_NONE>,
> >> +                            <GIC_SPI 100 IRQ_TYPE_NONE>,
> >> +                            <GIC_SPI 101 IRQ_TYPE_NONE>;
> >
> >
> >
> >> +               interrupt-map-mask = <0 0 0 0>;
> >> +               interrupt-map = <0 0 0 0 &gic GIC_SPI 100 IRQ_TYPE_NONE>;
> >
> > This interrupt is also listed in the "interrupts" above, which is
> > probably a mistake, unless the IRQ line is shared between all PCI
> > devices and the PCI host itself.
> >
> interrupts are for MSI interrupt support and interrupt-map is for legacy 
> INTx support. To my best knowledge, MSI and INTx cannot be used at the 
> same time. "nvidia,tegra20-pcie.txt" and "rcar-pci.txt" have similar 
> configurations.

Linux drivers will absolutely use MSI and legacy interrupts together, because
some drivers don't support MSI and others enable it unconditionally.

In both your examples (tegra and rcar), the interrupts that share the same
number are auxiliary and are correctly used with IRQF_SHARED, so that works.
If a device MSI just maps to a host IRQ however, you wouldn't be able to
use IRQF_SHARED.

	Arnd

Re: [PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

On 12/12/2014 5:05 AM, Alexandre Courbot wrote:
> On Fri, Dec 12, 2014 at 9:08 PM, Arnd Bergmann <arnd@arndb.de> wrote:
>> On Thursday 11 December 2014 16:05:04 Ray Jui wrote:
>>> +
>>> +- linux,gpio-base:
>>> +    Base GPIO number of this controller
>>> +
>>>
>>
>> We've NAK'ed properties like this multiple times before, and it
>> doesn't get any better this time. What are you trying to achieve
>> here?
>
> I am to blame for suggesting using this property to Ray, and I am
> fully aware that this has been rejected before, but look at what
> people came with recently to palliate the lack of control over the
> GPIO number space for DT platforms:
>
> http://www.spinics.net/lists/arm-kernel/msg384847.html
> https://lkml.org/lkml/2014/12/10/133
>
> Right now GPIO numbering for platforms using DT is a very inconsistent
> process, subject to change by the simple action of adjusting the value
> of ARCH_NR_GPIOS (which we did recently, btw), adding a new GPIO
> controller, or changing the probe order of devices. For users of the
> integer or sysfs interfaces, this results in GPIO numbers that change,
> and drivers and/or user-space programs that behave incorrectly.
> Ironically, the only way to have consistent numbers is to use the old
> platform files, where you can specify the base number of a gpio_chip.
>
> DT is actually probably not such a bad place to provide consistency in
> GPIO numbering. It has a global vision of the system layout, including
> all GPIO controllers and the number of GPIOs they include, and thus
> can make informed decisions. It provides a consistent result
> regardless of probe order. And allowing it to assign GPIO bases to
> controllers will free us from the nonsensical dependency of some
> arbitrary upper-bound for GPIO numbers that ARCH_NR_GPIOS imposes on
> us. Also about ARCH_NR_GPIOS, the plan is to eventually remove it
> since we don't need it anymore after the removal of the global
> gpio_descs array. This will again interfere with the numbering of GPIO
> chips that do not have a base number provided.
>
> Note that I don't really like this, either - but the problem is the
> GPIO integer interface. Until everyone has upgraded to gpiod and we
> have a replacement for the current sysfs interface (this will take a
> while) we have to cope with this. This issue has been bothering users
> for years, so this time I'd like to try and solve it the less ugly
> way. If there is a better solution, of course I'm all for it.
>
Agreed.

Since we are just starting to upstream all of our drivers for 
iProc/Cygnus, enforcing all of our new drivers to use the gpiod 
interface is not an issue and is something that should be done.

Our current issue is really on the sysfs interface, as I mentioned 
earlier, a lot of our customers use the sysfs interface for GPIO access. 
Until the sysfs interface issue is resolved, we sort of need a way to 
maintain the GPIO base between different GPIO controllers.

Re: [PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

On 12/12/2014 5:05 AM, Alexandre Courbot wrote:
> On Fri, Dec 12, 2014 at 9:08 PM, Arnd Bergmann <arnd@arndb.de> wrote:
>> On Thursday 11 December 2014 16:05:04 Ray Jui wrote:
>>> +
>>> +- linux,gpio-base:
>>> +    Base GPIO number of this controller
>>> +
>>>
>>
>> We've NAK'ed properties like this multiple times before, and it
>> doesn't get any better this time. What are you trying to achieve
>> here?
>
> I am to blame for suggesting using this property to Ray, and I am
> fully aware that this has been rejected before, but look at what
> people came with recently to palliate the lack of control over the
> GPIO number space for DT platforms:
>
> http://www.spinics.net/lists/arm-kernel/msg384847.html
> https://lkml.org/lkml/2014/12/10/133
>
> Right now GPIO numbering for platforms using DT is a very inconsistent
> process, subject to change by the simple action of adjusting the value
> of ARCH_NR_GPIOS (which we did recently, btw), adding a new GPIO
> controller, or changing the probe order of devices. For users of the
> integer or sysfs interfaces, this results in GPIO numbers that change,
> and drivers and/or user-space programs that behave incorrectly.
> Ironically, the only way to have consistent numbers is to use the old
> platform files, where you can specify the base number of a gpio_chip.
>
> DT is actually probably not such a bad place to provide consistency in
> GPIO numbering. It has a global vision of the system layout, including
> all GPIO controllers and the number of GPIOs they include, and thus
> can make informed decisions. It provides a consistent result
> regardless of probe order. And allowing it to assign GPIO bases to
> controllers will free us from the nonsensical dependency of some
> arbitrary upper-bound for GPIO numbers that ARCH_NR_GPIOS imposes on
> us. Also about ARCH_NR_GPIOS, the plan is to eventually remove it
> since we don't need it anymore after the removal of the global
> gpio_descs array. This will again interfere with the numbering of GPIO
> chips that do not have a base number provided.
>
> Note that I don't really like this, either - but the problem is the
> GPIO integer interface. Until everyone has upgraded to gpiod and we
> have a replacement for the current sysfs interface (this will take a
> while) we have to cope with this. This issue has been bothering users
> for years, so this time I'd like to try and solve it the less ugly
> way. If there is a better solution, of course I'm all for it.
>
Agreed.

Since we are just starting to upstream all of our drivers for 
iProc/Cygnus, enforcing all of our new drivers to use the gpiod 
interface is not an issue and is something that should be done.

Our current issue is really on the sysfs interface, as I mentioned 
earlier, a lot of our customers use the sysfs interface for GPIO access. 
Until the sysfs interface issue is resolved, we sort of need a way to 
maintain the GPIO base between different GPIO controllers.

[PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

On 12/12/2014 5:05 AM, Alexandre Courbot wrote:
> On Fri, Dec 12, 2014 at 9:08 PM, Arnd Bergmann <arnd@arndb.de> wrote:
>> On Thursday 11 December 2014 16:05:04 Ray Jui wrote:
>>> +
>>> +- linux,gpio-base:
>>> +    Base GPIO number of this controller
>>> +
>>>
>>
>> We've NAK'ed properties like this multiple times before, and it
>> doesn't get any better this time. What are you trying to achieve
>> here?
>
> I am to blame for suggesting using this property to Ray, and I am
> fully aware that this has been rejected before, but look at what
> people came with recently to palliate the lack of control over the
> GPIO number space for DT platforms:
>
> http://www.spinics.net/lists/arm-kernel/msg384847.html
> https://lkml.org/lkml/2014/12/10/133
>
> Right now GPIO numbering for platforms using DT is a very inconsistent
> process, subject to change by the simple action of adjusting the value
> of ARCH_NR_GPIOS (which we did recently, btw), adding a new GPIO
> controller, or changing the probe order of devices. For users of the
> integer or sysfs interfaces, this results in GPIO numbers that change,
> and drivers and/or user-space programs that behave incorrectly.
> Ironically, the only way to have consistent numbers is to use the old
> platform files, where you can specify the base number of a gpio_chip.
>
> DT is actually probably not such a bad place to provide consistency in
> GPIO numbering. It has a global vision of the system layout, including
> all GPIO controllers and the number of GPIOs they include, and thus
> can make informed decisions. It provides a consistent result
> regardless of probe order. And allowing it to assign GPIO bases to
> controllers will free us from the nonsensical dependency of some
> arbitrary upper-bound for GPIO numbers that ARCH_NR_GPIOS imposes on
> us. Also about ARCH_NR_GPIOS, the plan is to eventually remove it
> since we don't need it anymore after the removal of the global
> gpio_descs array. This will again interfere with the numbering of GPIO
> chips that do not have a base number provided.
>
> Note that I don't really like this, either - but the problem is the
> GPIO integer interface. Until everyone has upgraded to gpiod and we
> have a replacement for the current sysfs interface (this will take a
> while) we have to cope with this. This issue has been bothering users
> for years, so this time I'd like to try and solve it the less ugly
> way. If there is a better solution, of course I'm all for it.
>
Agreed.

Since we are just starting to upstream all of our drivers for 
iProc/Cygnus, enforcing all of our new drivers to use the gpiod 
interface is not an issue and is something that should be done.

Our current issue is really on the sysfs interface, as I mentioned 
earlier, a lot of our customers use the sysfs interface for GPIO access. 
Until the sysfs interface issue is resolved, we sort of need a way to 
maintain the GPIO base between different GPIO controllers.

Re: [PATCH v2 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Arnd Bergmann]

On Friday 12 December 2014 09:08:48 Ray Jui wrote:
> 
> On 12/12/2014 4:29 AM, Arnd Bergmann wrote:
> > On Thursday 11 December 2014 18:36:55 Ray Jui wrote:
> >> Add initial version of the Broadcom iProc PCIe driver. This driver
> >> has been tested on NSP and Cygnus and is expected to work on all iProc
> >> family of SoCs that deploys the same PCIe host controller
> >>
> >> The driver also supports MSI
> >
> > Overall, I'm not convinced it's worth continuing this driver. While it
> > supports more features, Hauke's version seemed much cleaner, and I'd
> > rather see his driver merged and have you add the additional features.
> >
> > Why did you drop him from Cc again?
> >
> In fact, Hauke is on the "to" list of all v2 patchset that I sent out. I 
> added him to the "to" list because he mentioned during v1 patchset 
> review that he'll help to test this on North Star.

Sorry, my mistake. I looked through the Cc list multiple times but failed
to see him there.
 
> Doesn't Hauke's driver depends on BCMA? In that case, how does it work 
> on the SoCs that do not have the IP block to support BCMA?

I hadn't realized that there are some SoCs that are not BCMA based.
As the host controller implementation is closely related, we will
have to come up with some solution.

One way to solve this would be by turning the driver into a library
the same way as the pcie-dw driver, and have separate front-ends
for it for platform_device and bcma_device.

As I mentioned in my other reply, we will likely have the same problem
in a number of other drivers too, so we could try to come up with
a way to make bcma_device fit better into the platform_device
infrastructure, but I wouldn't know how to do that without giving
it more thought.

> >> +static void iproc_pcie_reset(struct iproc_pcie *pcie)
> >> +{
> >> +	u32 val;
> >> +
> >> +	/* send a downstream reset */
> >> +	val = EP_MODE_SURVIVE_PERST | RC_PCIE_RST_OUTPUT;
> >> +	writel(val, pcie->reg + CLK_CONTROL_OFFSET);
> >> +	udelay(250);
> >> +	val &= ~EP_MODE_SURVIVE_PERST;
> >> +	writel(val, pcie->reg + CLK_CONTROL_OFFSET);
> >> +	mdelay(250);
> >> +}
> >
> > 250ms delay is not acceptable. Please find a way to call this function
> > from a context in which you can sleep.
> >
> This is called from driver probe, where runs in the process context 
> where you can sleep. Is my understanding correct? I can change mdelay to 
> msleep so the CPU does not waste time spinning.

Right, that sounds good.

> >> +	if (nlw == 0) {
> >> +		/* try GEN 1 link speed */
> >> +#define PCI_LINK_STATUS_CTRL_2_OFFSET 0xDC
> >> +#define PCI_TARGET_LINK_SPEED_MASK    0xF
> >> +#define PCI_TARGET_LINK_SPEED_GEN2    0x2
> >> +#define PCI_TARGET_LINK_SPEED_GEN1    0x1
> >> +		pci_bus_read_config_dword(&bus, 0,
> >> +				PCI_LINK_STATUS_CTRL_2_OFFSET, &val);
> >> +		if ((val & PCI_TARGET_LINK_SPEED_MASK) ==
> >> +				PCI_TARGET_LINK_SPEED_GEN2) {
> >> +			val &= ~PCI_TARGET_LINK_SPEED_MASK;
> >> +			val |= PCI_TARGET_LINK_SPEED_GEN1;
> >> +			pci_bus_write_config_dword(&bus, 0,
> >> +					PCI_LINK_STATUS_CTRL_2_OFFSET, val);
> >> +			pci_bus_read_config_dword(&bus, 0,
> >> +					PCI_LINK_STATUS_CTRL_2_OFFSET, &val);
> >> +			mdelay(100);
> >
> > Too much delay.
> >
> Need to confirm with the ASIC engineer. The delay may be what's needed.

If you can turn it into msleep here, it's fine. Just don't waste 100
million CPU cycles for no reason.

> >> +static int __init iproc_pcie_init(void)
> >> +{
> >> +	return platform_driver_probe(&iproc_pcie_driver,
> >> +			iproc_pcie_probe);
> >> +}
> >> +subsys_initcall(iproc_pcie_init);
> >
> > module_init()? Doesn't seem necessary to have this early.
> >
> > 	Arnd
> >
> Will look into this. Forgot why we use subsys_initcall here...

Probably copied from other drivers. It used to be required.

	Arnd

[PATCH v2 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Arnd Bergmann]

On Friday 12 December 2014 09:08:48 Ray Jui wrote:
> 
> On 12/12/2014 4:29 AM, Arnd Bergmann wrote:
> > On Thursday 11 December 2014 18:36:55 Ray Jui wrote:
> >> Add initial version of the Broadcom iProc PCIe driver. This driver
> >> has been tested on NSP and Cygnus and is expected to work on all iProc
> >> family of SoCs that deploys the same PCIe host controller
> >>
> >> The driver also supports MSI
> >
> > Overall, I'm not convinced it's worth continuing this driver. While it
> > supports more features, Hauke's version seemed much cleaner, and I'd
> > rather see his driver merged and have you add the additional features.
> >
> > Why did you drop him from Cc again?
> >
> In fact, Hauke is on the "to" list of all v2 patchset that I sent out. I 
> added him to the "to" list because he mentioned during v1 patchset 
> review that he'll help to test this on North Star.

Sorry, my mistake. I looked through the Cc list multiple times but failed
to see him there.
 
> Doesn't Hauke's driver depends on BCMA? In that case, how does it work 
> on the SoCs that do not have the IP block to support BCMA?

I hadn't realized that there are some SoCs that are not BCMA based.
As the host controller implementation is closely related, we will
have to come up with some solution.

One way to solve this would be by turning the driver into a library
the same way as the pcie-dw driver, and have separate front-ends
for it for platform_device and bcma_device.

As I mentioned in my other reply, we will likely have the same problem
in a number of other drivers too, so we could try to come up with
a way to make bcma_device fit better into the platform_device
infrastructure, but I wouldn't know how to do that without giving
it more thought.

> >> +static void iproc_pcie_reset(struct iproc_pcie *pcie)
> >> +{
> >> +	u32 val;
> >> +
> >> +	/* send a downstream reset */
> >> +	val = EP_MODE_SURVIVE_PERST | RC_PCIE_RST_OUTPUT;
> >> +	writel(val, pcie->reg + CLK_CONTROL_OFFSET);
> >> +	udelay(250);
> >> +	val &= ~EP_MODE_SURVIVE_PERST;
> >> +	writel(val, pcie->reg + CLK_CONTROL_OFFSET);
> >> +	mdelay(250);
> >> +}
> >
> > 250ms delay is not acceptable. Please find a way to call this function
> > from a context in which you can sleep.
> >
> This is called from driver probe, where runs in the process context 
> where you can sleep. Is my understanding correct? I can change mdelay to 
> msleep so the CPU does not waste time spinning.

Right, that sounds good.

> >> +	if (nlw == 0) {
> >> +		/* try GEN 1 link speed */
> >> +#define PCI_LINK_STATUS_CTRL_2_OFFSET 0xDC
> >> +#define PCI_TARGET_LINK_SPEED_MASK    0xF
> >> +#define PCI_TARGET_LINK_SPEED_GEN2    0x2
> >> +#define PCI_TARGET_LINK_SPEED_GEN1    0x1
> >> +		pci_bus_read_config_dword(&bus, 0,
> >> +				PCI_LINK_STATUS_CTRL_2_OFFSET, &val);
> >> +		if ((val & PCI_TARGET_LINK_SPEED_MASK) ==
> >> +				PCI_TARGET_LINK_SPEED_GEN2) {
> >> +			val &= ~PCI_TARGET_LINK_SPEED_MASK;
> >> +			val |= PCI_TARGET_LINK_SPEED_GEN1;
> >> +			pci_bus_write_config_dword(&bus, 0,
> >> +					PCI_LINK_STATUS_CTRL_2_OFFSET, val);
> >> +			pci_bus_read_config_dword(&bus, 0,
> >> +					PCI_LINK_STATUS_CTRL_2_OFFSET, &val);
> >> +			mdelay(100);
> >
> > Too much delay.
> >
> Need to confirm with the ASIC engineer. The delay may be what's needed.

If you can turn it into msleep here, it's fine. Just don't waste 100
million CPU cycles for no reason.

> >> +static int __init iproc_pcie_init(void)
> >> +{
> >> +	return platform_driver_probe(&iproc_pcie_driver,
> >> +			iproc_pcie_probe);
> >> +}
> >> +subsys_initcall(iproc_pcie_init);
> >
> > module_init()? Doesn't seem necessary to have this early.
> >
> > 	Arnd
> >
> Will look into this. Forgot why we use subsys_initcall here...

Probably copied from other drivers. It used to be required.

	Arnd

Re: [PATCH v2 1/4] pci: iProc: define Broadcom iProc PCIe binding

[Arend van Spriel]

On 12/12/14 18:14, Arnd Bergmann wrote:
> On Friday 12 December 2014 08:53:44 Ray Jui wrote:
>>
>> On 12/12/2014 4:14 AM, Arnd Bergmann wrote:
>>> On Thursday 11 December 2014 18:36:54 Ray Jui wrote:
>>>> index 0000000..040bc0f
>>>> --- /dev/null
>>>> +++ b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
>>>> @@ -0,0 +1,74 @@
>>>> +* Broadcom iProc PCIe controller
>>>> +
>>>> +Required properties:
>>>> +- compatible: Must be "brcm,iproc-pcie"
>>>> +- reg: base address and length of the PCIe controller and the MDIO interface
>>>> +  that controls the PCIe PHY
>>>> +- #interrupt-cells: set to<1>
>>>> +- interrupts: interrupt IDs
>>>
>>> How many, and what are they?
>>>
>> Different iProc SoCs might have different number of interrupts. I'll
>> elaborate more on the next patch.
>
> Ok.
>
>>>> +- interrupt-map-mask and interrupt-map, standard PCI properties to define the
>>>> +  mapping of the PCIe interface to interrupt numbers
>>>> +- bus-range: PCI bus numbers covered
>>>> +- #address-cells: set to<3>
>>>> +- #size-cells: set to<2>
>>>> +- device_type: set to "pci"
>>>> +- ranges: ranges for the PCI memory and I/O regions
>>>> +- phy-addr: MDC/MDIO adddress of the PCIe PHY
>>>
>>> It looks like the phy controller is separate from the PCI controller,
>>> and you even list the same register range for both PHYs. Better make
>>> that a separate driver and put the phy address into the "phys" reference.
>>>
>> Okay. In this case, I need to create a separate PHY driver under the
>> drivers/phy directory and have the PCIe host driver reference it through
>> the standard PHY API.
>
> Yes, that is what I meant. In particular, that has the advantage of letting
> you reuse the two drivers separately if some new SoC comes up that uses
> one but not the other. A lot of PHY implementations can support multiple
> protocols (e.g. pcie and usb3), but I don't know if yours does.
>
>>>> +- have-msi-inten-reg: Required for legacy iProc PCIe controllers that need the
>>>> +  MSI interrupt enable register to be set explicitly
>>>> +
>>>> +The Broadcom iProc PCie driver adapts the multi-domain structure, i.e., each
>>>> +interface has its own domain and therefore has its own device node
>>>> +Example:
>>>> +
>>>> +SoC specific DT Entry:
>>>> +
>>>> +       pcie0: pcie@18012000 {
>>>> +               compatible = "brcm,iproc-pcie";
>>>> +               reg =<0x18012000 0x1000>,
>>>> +<0x18002000 0x1000>;
>>>
>>> I guess the addresses should be relative to the BCMA bus, and this node
>>> get moved under that. Please see Hauke's patch series, we've discussed
>>> this in great length already.
>>>
>>
>> As Arend van Spriel pointed out in the previous discussion:
>>
>> BCMA core is the bus driver for discoverable ARM AXI interconnect. Apart
>> from that it also provides drivers for some cores. For the chips to be
>> discoverable it needs additional IP logic.
>>
>> Not all iProc family of SoCs have the additional IP logic and for those
>> which don't, they cannot use the BCMA bus.
>
> Ok, but the one from your example almost certainly does because the
> addresses are exactly the same ones as on bcm53xx.
>
> The same problem likely occurs on other peripherals, not just PCI,
> so we will have to come up with a way to have a common driver for
> bcma_bus and platform_bus for USB, SPI, brcmsmac, and likely others
> too.

Makes sense. I think that is what Hauke meant by "adding
additional support for registering to bcma". So the discovery info is a 
piece of read-only memory in the chip. Its address is stored in the 
chipcommon core register space. BCMA parses that memory blob resulting 
in a list of cores which register address info. We could add DT support 
in BCMA matching the compatible string and register a core for it.

However, apart from the discovery info a "discoverable ARM AXI" chip has 
a register space per core that provides common procedures like 
enable/disable, reset, core status, which are implemented in BCMA. I am 
not seeing that register space in the DT examples so I guess this IP 
block is not there for iProc chips.

Regards,
Arend

>>>> +               #interrupt-cells =<1>;
>>>> +               interrupts =<GIC_SPI 96 IRQ_TYPE_NONE>,
>>>> +<GIC_SPI 97 IRQ_TYPE_NONE>,
>>>> +<GIC_SPI 98 IRQ_TYPE_NONE>,
>>>> +<GIC_SPI 99 IRQ_TYPE_NONE>,
>>>> +<GIC_SPI 100 IRQ_TYPE_NONE>,
>>>> +<GIC_SPI 101 IRQ_TYPE_NONE>;
>>>
>>>
>>>
>>>> +               interrupt-map-mask =<0 0 0 0>;
>>>> +               interrupt-map =<0 0 0 0&gic GIC_SPI 100 IRQ_TYPE_NONE>;
>>>
>>> This interrupt is also listed in the "interrupts" above, which is
>>> probably a mistake, unless the IRQ line is shared between all PCI
>>> devices and the PCI host itself.
>>>
>> interrupts are for MSI interrupt support and interrupt-map is for legacy
>> INTx support. To my best knowledge, MSI and INTx cannot be used at the
>> same time. "nvidia,tegra20-pcie.txt" and "rcar-pci.txt" have similar
>> configurations.
>
> Linux drivers will absolutely use MSI and legacy interrupts together, because
> some drivers don't support MSI and others enable it unconditionally.
>
> In both your examples (tegra and rcar), the interrupts that share the same
> number are auxiliary and are correctly used with IRQF_SHARED, so that works.
> If a device MSI just maps to a host IRQ however, you wouldn't be able to
> use IRQF_SHARED.
>
> 	Arnd
> --
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Re: [PATCH v2 1/4] pci: iProc: define Broadcom iProc PCIe binding

[Arend van Spriel]

On 12/12/14 18:14, Arnd Bergmann wrote:
> On Friday 12 December 2014 08:53:44 Ray Jui wrote:
>>
>> On 12/12/2014 4:14 AM, Arnd Bergmann wrote:
>>> On Thursday 11 December 2014 18:36:54 Ray Jui wrote:
>>>> index 0000000..040bc0f
>>>> --- /dev/null
>>>> +++ b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
>>>> @@ -0,0 +1,74 @@
>>>> +* Broadcom iProc PCIe controller
>>>> +
>>>> +Required properties:
>>>> +- compatible: Must be "brcm,iproc-pcie"
>>>> +- reg: base address and length of the PCIe controller and the MDIO interface
>>>> +  that controls the PCIe PHY
>>>> +- #interrupt-cells: set to<1>
>>>> +- interrupts: interrupt IDs
>>>
>>> How many, and what are they?
>>>
>> Different iProc SoCs might have different number of interrupts. I'll
>> elaborate more on the next patch.
>
> Ok.
>
>>>> +- interrupt-map-mask and interrupt-map, standard PCI properties to define the
>>>> +  mapping of the PCIe interface to interrupt numbers
>>>> +- bus-range: PCI bus numbers covered
>>>> +- #address-cells: set to<3>
>>>> +- #size-cells: set to<2>
>>>> +- device_type: set to "pci"
>>>> +- ranges: ranges for the PCI memory and I/O regions
>>>> +- phy-addr: MDC/MDIO adddress of the PCIe PHY
>>>
>>> It looks like the phy controller is separate from the PCI controller,
>>> and you even list the same register range for both PHYs. Better make
>>> that a separate driver and put the phy address into the "phys" reference.
>>>
>> Okay. In this case, I need to create a separate PHY driver under the
>> drivers/phy directory and have the PCIe host driver reference it through
>> the standard PHY API.
>
> Yes, that is what I meant. In particular, that has the advantage of letting
> you reuse the two drivers separately if some new SoC comes up that uses
> one but not the other. A lot of PHY implementations can support multiple
> protocols (e.g. pcie and usb3), but I don't know if yours does.
>
>>>> +- have-msi-inten-reg: Required for legacy iProc PCIe controllers that need the
>>>> +  MSI interrupt enable register to be set explicitly
>>>> +
>>>> +The Broadcom iProc PCie driver adapts the multi-domain structure, i.e., each
>>>> +interface has its own domain and therefore has its own device node
>>>> +Example:
>>>> +
>>>> +SoC specific DT Entry:
>>>> +
>>>> +       pcie0: pcie@18012000 {
>>>> +               compatible = "brcm,iproc-pcie";
>>>> +               reg =<0x18012000 0x1000>,
>>>> +<0x18002000 0x1000>;
>>>
>>> I guess the addresses should be relative to the BCMA bus, and this node
>>> get moved under that. Please see Hauke's patch series, we've discussed
>>> this in great length already.
>>>
>>
>> As Arend van Spriel pointed out in the previous discussion:
>>
>> BCMA core is the bus driver for discoverable ARM AXI interconnect. Apart
>> from that it also provides drivers for some cores. For the chips to be
>> discoverable it needs additional IP logic.
>>
>> Not all iProc family of SoCs have the additional IP logic and for those
>> which don't, they cannot use the BCMA bus.
>
> Ok, but the one from your example almost certainly does because the
> addresses are exactly the same ones as on bcm53xx.
>
> The same problem likely occurs on other peripherals, not just PCI,
> so we will have to come up with a way to have a common driver for
> bcma_bus and platform_bus for USB, SPI, brcmsmac, and likely others
> too.

Makes sense. I think that is what Hauke meant by "adding
additional support for registering to bcma". So the discovery info is a 
piece of read-only memory in the chip. Its address is stored in the 
chipcommon core register space. BCMA parses that memory blob resulting 
in a list of cores which register address info. We could add DT support 
in BCMA matching the compatible string and register a core for it.

However, apart from the discovery info a "discoverable ARM AXI" chip has 
a register space per core that provides common procedures like 
enable/disable, reset, core status, which are implemented in BCMA. I am 
not seeing that register space in the DT examples so I guess this IP 
block is not there for iProc chips.

Regards,
Arend

>>>> +               #interrupt-cells =<1>;
>>>> +               interrupts =<GIC_SPI 96 IRQ_TYPE_NONE>,
>>>> +<GIC_SPI 97 IRQ_TYPE_NONE>,
>>>> +<GIC_SPI 98 IRQ_TYPE_NONE>,
>>>> +<GIC_SPI 99 IRQ_TYPE_NONE>,
>>>> +<GIC_SPI 100 IRQ_TYPE_NONE>,
>>>> +<GIC_SPI 101 IRQ_TYPE_NONE>;
>>>
>>>
>>>
>>>> +               interrupt-map-mask =<0 0 0 0>;
>>>> +               interrupt-map =<0 0 0 0&gic GIC_SPI 100 IRQ_TYPE_NONE>;
>>>
>>> This interrupt is also listed in the "interrupts" above, which is
>>> probably a mistake, unless the IRQ line is shared between all PCI
>>> devices and the PCI host itself.
>>>
>> interrupts are for MSI interrupt support and interrupt-map is for legacy
>> INTx support. To my best knowledge, MSI and INTx cannot be used at the
>> same time. "nvidia,tegra20-pcie.txt" and "rcar-pci.txt" have similar
>> configurations.
>
> Linux drivers will absolutely use MSI and legacy interrupts together, because
> some drivers don't support MSI and others enable it unconditionally.
>
> In both your examples (tegra and rcar), the interrupts that share the same
> number are auxiliary and are correctly used with IRQF_SHARED, so that works.
> If a device MSI just maps to a host IRQ however, you wouldn't be able to
> use IRQF_SHARED.
>
> 	Arnd
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[PATCH v2 1/4] pci: iProc: define Broadcom iProc PCIe binding

[Arend van Spriel]

On 12/12/14 18:14, Arnd Bergmann wrote:
> On Friday 12 December 2014 08:53:44 Ray Jui wrote:
>>
>> On 12/12/2014 4:14 AM, Arnd Bergmann wrote:
>>> On Thursday 11 December 2014 18:36:54 Ray Jui wrote:
>>>> index 0000000..040bc0f
>>>> --- /dev/null
>>>> +++ b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
>>>> @@ -0,0 +1,74 @@
>>>> +* Broadcom iProc PCIe controller
>>>> +
>>>> +Required properties:
>>>> +- compatible: Must be "brcm,iproc-pcie"
>>>> +- reg: base address and length of the PCIe controller and the MDIO interface
>>>> +  that controls the PCIe PHY
>>>> +- #interrupt-cells: set to<1>
>>>> +- interrupts: interrupt IDs
>>>
>>> How many, and what are they?
>>>
>> Different iProc SoCs might have different number of interrupts. I'll
>> elaborate more on the next patch.
>
> Ok.
>
>>>> +- interrupt-map-mask and interrupt-map, standard PCI properties to define the
>>>> +  mapping of the PCIe interface to interrupt numbers
>>>> +- bus-range: PCI bus numbers covered
>>>> +- #address-cells: set to<3>
>>>> +- #size-cells: set to<2>
>>>> +- device_type: set to "pci"
>>>> +- ranges: ranges for the PCI memory and I/O regions
>>>> +- phy-addr: MDC/MDIO adddress of the PCIe PHY
>>>
>>> It looks like the phy controller is separate from the PCI controller,
>>> and you even list the same register range for both PHYs. Better make
>>> that a separate driver and put the phy address into the "phys" reference.
>>>
>> Okay. In this case, I need to create a separate PHY driver under the
>> drivers/phy directory and have the PCIe host driver reference it through
>> the standard PHY API.
>
> Yes, that is what I meant. In particular, that has the advantage of letting
> you reuse the two drivers separately if some new SoC comes up that uses
> one but not the other. A lot of PHY implementations can support multiple
> protocols (e.g. pcie and usb3), but I don't know if yours does.
>
>>>> +- have-msi-inten-reg: Required for legacy iProc PCIe controllers that need the
>>>> +  MSI interrupt enable register to be set explicitly
>>>> +
>>>> +The Broadcom iProc PCie driver adapts the multi-domain structure, i.e., each
>>>> +interface has its own domain and therefore has its own device node
>>>> +Example:
>>>> +
>>>> +SoC specific DT Entry:
>>>> +
>>>> +       pcie0: pcie at 18012000 {
>>>> +               compatible = "brcm,iproc-pcie";
>>>> +               reg =<0x18012000 0x1000>,
>>>> +<0x18002000 0x1000>;
>>>
>>> I guess the addresses should be relative to the BCMA bus, and this node
>>> get moved under that. Please see Hauke's patch series, we've discussed
>>> this in great length already.
>>>
>>
>> As Arend van Spriel pointed out in the previous discussion:
>>
>> BCMA core is the bus driver for discoverable ARM AXI interconnect. Apart
>> from that it also provides drivers for some cores. For the chips to be
>> discoverable it needs additional IP logic.
>>
>> Not all iProc family of SoCs have the additional IP logic and for those
>> which don't, they cannot use the BCMA bus.
>
> Ok, but the one from your example almost certainly does because the
> addresses are exactly the same ones as on bcm53xx.
>
> The same problem likely occurs on other peripherals, not just PCI,
> so we will have to come up with a way to have a common driver for
> bcma_bus and platform_bus for USB, SPI, brcmsmac, and likely others
> too.

Makes sense. I think that is what Hauke meant by "adding
additional support for registering to bcma". So the discovery info is a 
piece of read-only memory in the chip. Its address is stored in the 
chipcommon core register space. BCMA parses that memory blob resulting 
in a list of cores which register address info. We could add DT support 
in BCMA matching the compatible string and register a core for it.

However, apart from the discovery info a "discoverable ARM AXI" chip has 
a register space per core that provides common procedures like 
enable/disable, reset, core status, which are implemented in BCMA. I am 
not seeing that register space in the DT examples so I guess this IP 
block is not there for iProc chips.

Regards,
Arend

>>>> +               #interrupt-cells =<1>;
>>>> +               interrupts =<GIC_SPI 96 IRQ_TYPE_NONE>,
>>>> +<GIC_SPI 97 IRQ_TYPE_NONE>,
>>>> +<GIC_SPI 98 IRQ_TYPE_NONE>,
>>>> +<GIC_SPI 99 IRQ_TYPE_NONE>,
>>>> +<GIC_SPI 100 IRQ_TYPE_NONE>,
>>>> +<GIC_SPI 101 IRQ_TYPE_NONE>;
>>>
>>>
>>>
>>>> +               interrupt-map-mask =<0 0 0 0>;
>>>> +               interrupt-map =<0 0 0 0&gic GIC_SPI 100 IRQ_TYPE_NONE>;
>>>
>>> This interrupt is also listed in the "interrupts" above, which is
>>> probably a mistake, unless the IRQ line is shared between all PCI
>>> devices and the PCI host itself.
>>>
>> interrupts are for MSI interrupt support and interrupt-map is for legacy
>> INTx support. To my best knowledge, MSI and INTx cannot be used at the
>> same time. "nvidia,tegra20-pcie.txt" and "rcar-pci.txt" have similar
>> configurations.
>
> Linux drivers will absolutely use MSI and legacy interrupts together, because
> some drivers don't support MSI and others enable it unconditionally.
>
> In both your examples (tegra and rcar), the interrupts that share the same
> number are auxiliary and are correctly used with IRQF_SHARED, so that works.
> If a device MSI just maps to a host IRQ however, you wouldn't be able to
> use IRQF_SHARED.
>
> 	Arnd
> --
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Re: [PATCH v2 1/4] pci: iProc: define Broadcom iProc PCIe binding

[Arnd Bergmann]

On Saturday 13 December 2014 11:05:52 Arend van Spriel wrote:
> 
> Makes sense. I think that is what Hauke meant by "adding
> additional support for registering to bcma". So the discovery info is a 
> piece of read-only memory in the chip. Its address is stored in the 
> chipcommon core register space. BCMA parses that memory blob resulting 
> in a list of cores which register address info. We could add DT support 
> in BCMA matching the compatible string and register a core for it.

Ah, interesting idea. That would mirror what we do for drivers/amba,
I like the idea.

> However, apart from the discovery info a "discoverable ARM AXI" chip has 
> a register space per core that provides common procedures like 
> enable/disable, reset, core status, which are implemented in BCMA. I am 
> not seeing that register space in the DT examples so I guess this IP 
> block is not there for iProc chips.

I wouldn't draw conclusions from the absence of some node. Maybe these
registers are present but just not used by the original BSP.

	Arnd

[PATCH v2 1/4] pci: iProc: define Broadcom iProc PCIe binding

[Arnd Bergmann]

On Saturday 13 December 2014 11:05:52 Arend van Spriel wrote:
> 
> Makes sense. I think that is what Hauke meant by "adding
> additional support for registering to bcma". So the discovery info is a 
> piece of read-only memory in the chip. Its address is stored in the 
> chipcommon core register space. BCMA parses that memory blob resulting 
> in a list of cores which register address info. We could add DT support 
> in BCMA matching the compatible string and register a core for it.

Ah, interesting idea. That would mirror what we do for drivers/amba,
I like the idea.

> However, apart from the discovery info a "discoverable ARM AXI" chip has 
> a register space per core that provides common procedures like 
> enable/disable, reset, core status, which are implemented in BCMA. I am 
> not seeing that register space in the DT examples so I guess this IP 
> block is not there for iProc chips.

I wouldn't draw conclusions from the absence of some node. Maybe these
registers are present but just not used by the original BSP.

	Arnd

Re: [PATCH v2 1/4] pci: iProc: define Broadcom iProc PCIe binding

[Arend van Spriel]

On 12/13/14 20:46, Arnd Bergmann wrote:
> On Saturday 13 December 2014 11:05:52 Arend van Spriel wrote:
>>
>> Makes sense. I think that is what Hauke meant by "adding
>> additional support for registering to bcma". So the discovery info is a
>> piece of read-only memory in the chip. Its address is stored in the
>> chipcommon core register space. BCMA parses that memory blob resulting
>> in a list of cores which register address info. We could add DT support
>> in BCMA matching the compatible string and register a core for it.
>
> Ah, interesting idea. That would mirror what we do for drivers/amba,
> I like the idea.

+ Rafal

Let's explore this. Although I don't have the iProc hardware to verify it.

>> However, apart from the discovery info a "discoverable ARM AXI" chip has
>> a register space per core that provides common procedures like
>> enable/disable, reset, core status, which are implemented in BCMA. I am
>> not seeing that register space in the DT examples so I guess this IP
>> block is not there for iProc chips.
>
> I wouldn't draw conclusions from the absence of some node. Maybe these
> registers are present but just not used by the original BSP.

I do not intend to. We have raised the question internally to iProc chip 
designers.

Regards,
Arend

[PATCH v2 1/4] pci: iProc: define Broadcom iProc PCIe binding

[Arend van Spriel]

On 12/13/14 20:46, Arnd Bergmann wrote:
> On Saturday 13 December 2014 11:05:52 Arend van Spriel wrote:
>>
>> Makes sense. I think that is what Hauke meant by "adding
>> additional support for registering to bcma". So the discovery info is a
>> piece of read-only memory in the chip. Its address is stored in the
>> chipcommon core register space. BCMA parses that memory blob resulting
>> in a list of cores which register address info. We could add DT support
>> in BCMA matching the compatible string and register a core for it.
>
> Ah, interesting idea. That would mirror what we do for drivers/amba,
> I like the idea.

+ Rafal

Let's explore this. Although I don't have the iProc hardware to verify it.

>> However, apart from the discovery info a "discoverable ARM AXI" chip has
>> a register space per core that provides common procedures like
>> enable/disable, reset, core status, which are implemented in BCMA. I am
>> not seeing that register space in the DT examples so I guess this IP
>> block is not there for iProc chips.
>
> I wouldn't draw conclusions from the absence of some node. Maybe these
> registers are present but just not used by the original BSP.

I do not intend to. We have raised the question internally to iProc chip 
designers.

Regards,
Arend

Re: [PATCH v2 1/4] pci: iProc: define Broadcom iProc PCIe binding

[Arnd Bergmann]

On Sunday 14 December 2014 10:48:01 Arend van Spriel wrote:
> On 12/13/14 20:46, Arnd Bergmann wrote:
> > On Saturday 13 December 2014 11:05:52 Arend van Spriel wrote:
> >>
> >> Makes sense. I think that is what Hauke meant by "adding
> >> additional support for registering to bcma". So the discovery info is a
> >> piece of read-only memory in the chip. Its address is stored in the
> >> chipcommon core register space. BCMA parses that memory blob resulting
> >> in a list of cores which register address info. We could add DT support
> >> in BCMA matching the compatible string and register a core for it.
> >
> > Ah, interesting idea. That would mirror what we do for drivers/amba,
> > I like the idea.
> 
> + Rafal
> 
> Let's explore this. Although I don't have the iProc hardware to verify it.
> 

If we can make this work nicely, you won't even need iProc hardware,
but instead provide all the data for the bcma devices on an older
machine through DT and get the probing to work with that. For AMBA,
we actually allow mixing amba and platform devices on the same parent.
You could do this here as well, but it would be simpler to have a
a special bcma device node as the parent that does the probing, in order
to avoid adding bcma specific code to drivers/of/platform.c

	Arnd

Re: [PATCH v2 1/4] pci: iProc: define Broadcom iProc PCIe binding

[Arnd Bergmann]

On Sunday 14 December 2014 10:48:01 Arend van Spriel wrote:
> On 12/13/14 20:46, Arnd Bergmann wrote:
> > On Saturday 13 December 2014 11:05:52 Arend van Spriel wrote:
> >>
> >> Makes sense. I think that is what Hauke meant by "adding
> >> additional support for registering to bcma". So the discovery info is a
> >> piece of read-only memory in the chip. Its address is stored in the
> >> chipcommon core register space. BCMA parses that memory blob resulting
> >> in a list of cores which register address info. We could add DT support
> >> in BCMA matching the compatible string and register a core for it.
> >
> > Ah, interesting idea. That would mirror what we do for drivers/amba,
> > I like the idea.
> 
> + Rafal
> 
> Let's explore this. Although I don't have the iProc hardware to verify it.
> 

If we can make this work nicely, you won't even need iProc hardware,
but instead provide all the data for the bcma devices on an older
machine through DT and get the probing to work with that. For AMBA,
we actually allow mixing amba and platform devices on the same parent.
You could do this here as well, but it would be simpler to have a
a special bcma device node as the parent that does the probing, in order
to avoid adding bcma specific code to drivers/of/platform.c

	Arnd
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[PATCH v2 1/4] pci: iProc: define Broadcom iProc PCIe binding

[Arnd Bergmann]

On Sunday 14 December 2014 10:48:01 Arend van Spriel wrote:
> On 12/13/14 20:46, Arnd Bergmann wrote:
> > On Saturday 13 December 2014 11:05:52 Arend van Spriel wrote:
> >>
> >> Makes sense. I think that is what Hauke meant by "adding
> >> additional support for registering to bcma". So the discovery info is a
> >> piece of read-only memory in the chip. Its address is stored in the
> >> chipcommon core register space. BCMA parses that memory blob resulting
> >> in a list of cores which register address info. We could add DT support
> >> in BCMA matching the compatible string and register a core for it.
> >
> > Ah, interesting idea. That would mirror what we do for drivers/amba,
> > I like the idea.
> 
> + Rafal
> 
> Let's explore this. Although I don't have the iProc hardware to verify it.
> 

If we can make this work nicely, you won't even need iProc hardware,
but instead provide all the data for the bcma devices on an older
machine through DT and get the probing to work with that. For AMBA,
we actually allow mixing amba and platform devices on the same parent.
You could do this here as well, but it would be simpler to have a
a special bcma device node as the parent that does the probing, in order
to avoid adding bcma specific code to drivers/of/platform.c

	Arnd

Re: [PATCH v2 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Ray Jui]

On 12/12/2014 9:21 AM, Arnd Bergmann wrote:
> On Friday 12 December 2014 09:08:48 Ray Jui wrote:
>>
>> On 12/12/2014 4:29 AM, Arnd Bergmann wrote:
>> Doesn't Hauke's driver depends on BCMA? In that case, how does it work
>> on the SoCs that do not have the IP block to support BCMA?
>
> I hadn't realized that there are some SoCs that are not BCMA based.
> As the host controller implementation is closely related, we will
> have to come up with some solution.
>
I agree with you that we should have a common PCIe host driver which 
supports all iProc SoCs, BCM4708, BCM5301X, and some other similar SoCs.

> One way to solve this would be by turning the driver into a library
> the same way as the pcie-dw driver, and have separate front-ends
> for it for platform_device and bcma_device.
>
I'm fine with this solution, i.e., to introduce a common pcie-iproc core 
driver (just like pcie-designware) and have different front-ends 
depending on the device/bus type. If we end up deciding to go with this 
solution, I need to discuss with Hauke to come up with a plan to 
collaborate.

But before we choose to go with that route, may I ask, what is the 
purpose of tying a PCIe host driver to BCMA? What benefit does BCMA give 
us? If we have a generic platform based PCIe driver that can work on all 
iProc SoCs + BCM4708 and BCM5301X with all HW specific configurations 
taken care of by device tree, why do we still need to use BCMA?

I thought all a BCMA device here does is to auto-instantiate based on 
some register readings?

Re: [PATCH v2 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Ray Jui]

On 12/12/2014 9:21 AM, Arnd Bergmann wrote:
> On Friday 12 December 2014 09:08:48 Ray Jui wrote:
>>
>> On 12/12/2014 4:29 AM, Arnd Bergmann wrote:
>> Doesn't Hauke's driver depends on BCMA? In that case, how does it work
>> on the SoCs that do not have the IP block to support BCMA?
>
> I hadn't realized that there are some SoCs that are not BCMA based.
> As the host controller implementation is closely related, we will
> have to come up with some solution.
>
I agree with you that we should have a common PCIe host driver which 
supports all iProc SoCs, BCM4708, BCM5301X, and some other similar SoCs.

> One way to solve this would be by turning the driver into a library
> the same way as the pcie-dw driver, and have separate front-ends
> for it for platform_device and bcma_device.
>
I'm fine with this solution, i.e., to introduce a common pcie-iproc core 
driver (just like pcie-designware) and have different front-ends 
depending on the device/bus type. If we end up deciding to go with this 
solution, I need to discuss with Hauke to come up with a plan to 
collaborate.

But before we choose to go with that route, may I ask, what is the 
purpose of tying a PCIe host driver to BCMA? What benefit does BCMA give 
us? If we have a generic platform based PCIe driver that can work on all 
iProc SoCs + BCM4708 and BCM5301X with all HW specific configurations 
taken care of by device tree, why do we still need to use BCMA?

I thought all a BCMA device here does is to auto-instantiate based on 
some register readings?
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[PATCH v2 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Ray Jui]

On 12/12/2014 9:21 AM, Arnd Bergmann wrote:
> On Friday 12 December 2014 09:08:48 Ray Jui wrote:
>>
>> On 12/12/2014 4:29 AM, Arnd Bergmann wrote:
>> Doesn't Hauke's driver depends on BCMA? In that case, how does it work
>> on the SoCs that do not have the IP block to support BCMA?
>
> I hadn't realized that there are some SoCs that are not BCMA based.
> As the host controller implementation is closely related, we will
> have to come up with some solution.
>
I agree with you that we should have a common PCIe host driver which 
supports all iProc SoCs, BCM4708, BCM5301X, and some other similar SoCs.

> One way to solve this would be by turning the driver into a library
> the same way as the pcie-dw driver, and have separate front-ends
> for it for platform_device and bcma_device.
>
I'm fine with this solution, i.e., to introduce a common pcie-iproc core 
driver (just like pcie-designware) and have different front-ends 
depending on the device/bus type. If we end up deciding to go with this 
solution, I need to discuss with Hauke to come up with a plan to 
collaborate.

But before we choose to go with that route, may I ask, what is the 
purpose of tying a PCIe host driver to BCMA? What benefit does BCMA give 
us? If we have a generic platform based PCIe driver that can work on all 
iProc SoCs + BCM4708 and BCM5301X with all HW specific configurations 
taken care of by device tree, why do we still need to use BCMA?

I thought all a BCMA device here does is to auto-instantiate based on 
some register readings?

Re: [PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

On 12/12/2014 7:28 AM, Arnd Bergmann wrote:
> On Friday 12 December 2014 22:05:37 Alexandre Courbot wrote:
>> On Fri, Dec 12, 2014 at 9:08 PM, Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org> wrote:
>>> On Thursday 11 December 2014 16:05:04 Ray Jui wrote:
>>>> +
>>>> +- linux,gpio-base:
>>>> +    Base GPIO number of this controller
>>>> +
>>>>
>>>
>>> We've NAK'ed properties like this multiple times before, and it
>>> doesn't get any better this time. What are you trying to achieve
>>> here?
>>
>> I am to blame for suggesting using this property to Ray, and I am
>> fully aware that this has been rejected before, but look at what
>> people came with recently to palliate the lack of control over the
>> GPIO number space for DT platforms:
>>
>> http://www.spinics.net/lists/arm-kernel/msg384847.html
>> https://lkml.org/lkml/2014/12/10/133
>>
>> Right now GPIO numbering for platforms using DT is a very inconsistent
>> process, subject to change by the simple action of adjusting the value
>> of ARCH_NR_GPIOS (which we did recently, btw), adding a new GPIO
>> controller, or changing the probe order of devices. For users of the
>> integer or sysfs interfaces, this results in GPIO numbers that change,
>> and drivers and/or user-space programs that behave incorrectly.
>> Ironically, the only way to have consistent numbers is to use the old
>> platform files, where you can specify the base number of a gpio_chip.
>>
>> DT is actually probably not such a bad place to provide consistency in
>> GPIO numbering. It has a global vision of the system layout, including
>> all GPIO controllers and the number of GPIOs they include, and thus
>> can make informed decisions. It provides a consistent result
>> regardless of probe order. And allowing it to assign GPIO bases to
>> controllers will free us from the nonsensical dependency of some
>> arbitrary upper-bound for GPIO numbers that ARCH_NR_GPIOS imposes on
>> us. Also about ARCH_NR_GPIOS, the plan is to eventually remove it
>> since we don't need it anymore after the removal of the global
>> gpio_descs array. This will again interfere with the numbering of GPIO
>> chips that do not have a base number provided.
>>
>> Note that I don't really like this, either - but the problem is the
>> GPIO integer interface. Until everyone has upgraded to gpiod and we
>> have a replacement for the current sysfs interface (this will take a
>> while) we have to cope with this. This issue has been bothering users
>> for years, so this time I'd like to try and solve it the less ugly
>> way. If there is a better solution, of course I'm all for it.
>
> I think the scheme will fail if you ever get gpio controllers that are
> not part of the DT: We have hotpluggable devices (PCI, USB, ...) that
> are not represented in DT and that may also provide GPIOs for internal
> uses.
>
> The current state of affairs is definitely problematic, but defining
> the GPIO numbers in DT properties would only be a relative improvement,
> not a solution, and I fear it would make it harder to change the kernel
> to remove the gpio numbers eventually.
>
> I wonder if we could instead come up with an approach that completely
> randomizes the gpio numbers (as a compile-time option) to find any
> places that still rely on specific numbers.
>
> 	Arnd
>
Okay, if people think defining the GPIO base number in DT properties as 
a temporary, transient solution is not acceptable, I can switch the 
driver to use dynamic GPIO number allocation (by setting gpio base to a 
negative number and let gpiochip_add find a usable base number).

Like I said previously, dynamic GPIO allocation works fine in the 
kernel, as long as all of our GPIO clients in the kernel use gpiod based 
API, which is what we will enforce going forward. The only problem is 
with some of our customers who use GPIO through sysfs and expect fixed 
global GPIO numbers. Thinking about this more, it's probably not that 
difficult to add a script for those customers to convert/map the GPIO 
numbers based on readings parsed from sysfs, so I guess that's fine.

I'll submit v6 patchset with DT property "linux,gpio-base" removed.
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Re: [PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

On 12/12/2014 7:28 AM, Arnd Bergmann wrote:
> On Friday 12 December 2014 22:05:37 Alexandre Courbot wrote:
>> On Fri, Dec 12, 2014 at 9:08 PM, Arnd Bergmann <arnd@arndb.de> wrote:
>>> On Thursday 11 December 2014 16:05:04 Ray Jui wrote:
>>>> +
>>>> +- linux,gpio-base:
>>>> +    Base GPIO number of this controller
>>>> +
>>>>
>>>
>>> We've NAK'ed properties like this multiple times before, and it
>>> doesn't get any better this time. What are you trying to achieve
>>> here?
>>
>> I am to blame for suggesting using this property to Ray, and I am
>> fully aware that this has been rejected before, but look at what
>> people came with recently to palliate the lack of control over the
>> GPIO number space for DT platforms:
>>
>> http://www.spinics.net/lists/arm-kernel/msg384847.html
>> https://lkml.org/lkml/2014/12/10/133
>>
>> Right now GPIO numbering for platforms using DT is a very inconsistent
>> process, subject to change by the simple action of adjusting the value
>> of ARCH_NR_GPIOS (which we did recently, btw), adding a new GPIO
>> controller, or changing the probe order of devices. For users of the
>> integer or sysfs interfaces, this results in GPIO numbers that change,
>> and drivers and/or user-space programs that behave incorrectly.
>> Ironically, the only way to have consistent numbers is to use the old
>> platform files, where you can specify the base number of a gpio_chip.
>>
>> DT is actually probably not such a bad place to provide consistency in
>> GPIO numbering. It has a global vision of the system layout, including
>> all GPIO controllers and the number of GPIOs they include, and thus
>> can make informed decisions. It provides a consistent result
>> regardless of probe order. And allowing it to assign GPIO bases to
>> controllers will free us from the nonsensical dependency of some
>> arbitrary upper-bound for GPIO numbers that ARCH_NR_GPIOS imposes on
>> us. Also about ARCH_NR_GPIOS, the plan is to eventually remove it
>> since we don't need it anymore after the removal of the global
>> gpio_descs array. This will again interfere with the numbering of GPIO
>> chips that do not have a base number provided.
>>
>> Note that I don't really like this, either - but the problem is the
>> GPIO integer interface. Until everyone has upgraded to gpiod and we
>> have a replacement for the current sysfs interface (this will take a
>> while) we have to cope with this. This issue has been bothering users
>> for years, so this time I'd like to try and solve it the less ugly
>> way. If there is a better solution, of course I'm all for it.
>
> I think the scheme will fail if you ever get gpio controllers that are
> not part of the DT: We have hotpluggable devices (PCI, USB, ...) that
> are not represented in DT and that may also provide GPIOs for internal
> uses.
>
> The current state of affairs is definitely problematic, but defining
> the GPIO numbers in DT properties would only be a relative improvement,
> not a solution, and I fear it would make it harder to change the kernel
> to remove the gpio numbers eventually.
>
> I wonder if we could instead come up with an approach that completely
> randomizes the gpio numbers (as a compile-time option) to find any
> places that still rely on specific numbers.
>
> 	Arnd
>
Okay, if people think defining the GPIO base number in DT properties as 
a temporary, transient solution is not acceptable, I can switch the 
driver to use dynamic GPIO number allocation (by setting gpio base to a 
negative number and let gpiochip_add find a usable base number).

Like I said previously, dynamic GPIO allocation works fine in the 
kernel, as long as all of our GPIO clients in the kernel use gpiod based 
API, which is what we will enforce going forward. The only problem is 
with some of our customers who use GPIO through sysfs and expect fixed 
global GPIO numbers. Thinking about this more, it's probably not that 
difficult to add a script for those customers to convert/map the GPIO 
numbers based on readings parsed from sysfs, so I guess that's fine.

I'll submit v6 patchset with DT property "linux,gpio-base" removed.

[PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

On 12/12/2014 7:28 AM, Arnd Bergmann wrote:
> On Friday 12 December 2014 22:05:37 Alexandre Courbot wrote:
>> On Fri, Dec 12, 2014 at 9:08 PM, Arnd Bergmann <arnd@arndb.de> wrote:
>>> On Thursday 11 December 2014 16:05:04 Ray Jui wrote:
>>>> +
>>>> +- linux,gpio-base:
>>>> +    Base GPIO number of this controller
>>>> +
>>>>
>>>
>>> We've NAK'ed properties like this multiple times before, and it
>>> doesn't get any better this time. What are you trying to achieve
>>> here?
>>
>> I am to blame for suggesting using this property to Ray, and I am
>> fully aware that this has been rejected before, but look at what
>> people came with recently to palliate the lack of control over the
>> GPIO number space for DT platforms:
>>
>> http://www.spinics.net/lists/arm-kernel/msg384847.html
>> https://lkml.org/lkml/2014/12/10/133
>>
>> Right now GPIO numbering for platforms using DT is a very inconsistent
>> process, subject to change by the simple action of adjusting the value
>> of ARCH_NR_GPIOS (which we did recently, btw), adding a new GPIO
>> controller, or changing the probe order of devices. For users of the
>> integer or sysfs interfaces, this results in GPIO numbers that change,
>> and drivers and/or user-space programs that behave incorrectly.
>> Ironically, the only way to have consistent numbers is to use the old
>> platform files, where you can specify the base number of a gpio_chip.
>>
>> DT is actually probably not such a bad place to provide consistency in
>> GPIO numbering. It has a global vision of the system layout, including
>> all GPIO controllers and the number of GPIOs they include, and thus
>> can make informed decisions. It provides a consistent result
>> regardless of probe order. And allowing it to assign GPIO bases to
>> controllers will free us from the nonsensical dependency of some
>> arbitrary upper-bound for GPIO numbers that ARCH_NR_GPIOS imposes on
>> us. Also about ARCH_NR_GPIOS, the plan is to eventually remove it
>> since we don't need it anymore after the removal of the global
>> gpio_descs array. This will again interfere with the numbering of GPIO
>> chips that do not have a base number provided.
>>
>> Note that I don't really like this, either - but the problem is the
>> GPIO integer interface. Until everyone has upgraded to gpiod and we
>> have a replacement for the current sysfs interface (this will take a
>> while) we have to cope with this. This issue has been bothering users
>> for years, so this time I'd like to try and solve it the less ugly
>> way. If there is a better solution, of course I'm all for it.
>
> I think the scheme will fail if you ever get gpio controllers that are
> not part of the DT: We have hotpluggable devices (PCI, USB, ...) that
> are not represented in DT and that may also provide GPIOs for internal
> uses.
>
> The current state of affairs is definitely problematic, but defining
> the GPIO numbers in DT properties would only be a relative improvement,
> not a solution, and I fear it would make it harder to change the kernel
> to remove the gpio numbers eventually.
>
> I wonder if we could instead come up with an approach that completely
> randomizes the gpio numbers (as a compile-time option) to find any
> places that still rely on specific numbers.
>
> 	Arnd
>
Okay, if people think defining the GPIO base number in DT properties as 
a temporary, transient solution is not acceptable, I can switch the 
driver to use dynamic GPIO number allocation (by setting gpio base to a 
negative number and let gpiochip_add find a usable base number).

Like I said previously, dynamic GPIO allocation works fine in the 
kernel, as long as all of our GPIO clients in the kernel use gpiod based 
API, which is what we will enforce going forward. The only problem is 
with some of our customers who use GPIO through sysfs and expect fixed 
global GPIO numbers. Thinking about this more, it's probably not that 
difficult to add a script for those customers to convert/map the GPIO 
numbers based on readings parsed from sysfs, so I guess that's fine.

I'll submit v6 patchset with DT property "linux,gpio-base" removed.

Re: [PATCH v2 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Arnd Bergmann]

On Monday 15 December 2014 11:16:31 Ray Jui wrote:
> On 12/12/2014 9:21 AM, Arnd Bergmann wrote:
> > On Friday 12 December 2014 09:08:48 Ray Jui wrote:
> > One way to solve this would be by turning the driver into a library
> > the same way as the pcie-dw driver, and have separate front-ends
> > for it for platform_device and bcma_device.
> >
> I'm fine with this solution, i.e., to introduce a common pcie-iproc core 
> driver (just like pcie-designware) and have different front-ends 
> depending on the device/bus type. If we end up deciding to go with this 
> solution, I need to discuss with Hauke to come up with a plan to 
> collaborate.

Ok

> But before we choose to go with that route, may I ask, what is the 
> purpose of tying a PCIe host driver to BCMA? What benefit does BCMA give 
> us? If we have a generic platform based PCIe driver that can work on all 
> iProc SoCs + BCM4708 and BCM5301X with all HW specific configurations 
> taken care of by device tree, why do we still need to use BCMA?
> 
> I thought all a BCMA device here does is to auto-instantiate based on 
> some register readings?

Basically, DT is a hack that we only need for nondiscoverable buses.
As BCMA is (mostly) discoverable, we should use that, just like we do
for things like PCI and USB. There are clearly some limitations to 
BCMA as well, e.g. on bcm4708 we don't have proper IRQ numbers in
the device list and we need to work around that using DT, but overall
it still seems to have more upsides than downsides to use it.

It's also good to point other SoC makers to Broadcom as a good example
for how to do things they claim are impossible to do.

	Arnd

[PATCH v2 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Arnd Bergmann]

On Monday 15 December 2014 11:16:31 Ray Jui wrote:
> On 12/12/2014 9:21 AM, Arnd Bergmann wrote:
> > On Friday 12 December 2014 09:08:48 Ray Jui wrote:
> > One way to solve this would be by turning the driver into a library
> > the same way as the pcie-dw driver, and have separate front-ends
> > for it for platform_device and bcma_device.
> >
> I'm fine with this solution, i.e., to introduce a common pcie-iproc core 
> driver (just like pcie-designware) and have different front-ends 
> depending on the device/bus type. If we end up deciding to go with this 
> solution, I need to discuss with Hauke to come up with a plan to 
> collaborate.

Ok

> But before we choose to go with that route, may I ask, what is the 
> purpose of tying a PCIe host driver to BCMA? What benefit does BCMA give 
> us? If we have a generic platform based PCIe driver that can work on all 
> iProc SoCs + BCM4708 and BCM5301X with all HW specific configurations 
> taken care of by device tree, why do we still need to use BCMA?
> 
> I thought all a BCMA device here does is to auto-instantiate based on 
> some register readings?

Basically, DT is a hack that we only need for nondiscoverable buses.
As BCMA is (mostly) discoverable, we should use that, just like we do
for things like PCI and USB. There are clearly some limitations to 
BCMA as well, e.g. on bcm4708 we don't have proper IRQ numbers in
the device list and we need to work around that using DT, but overall
it still seems to have more upsides than downsides to use it.

It's also good to point other SoC makers to Broadcom as a good example
for how to do things they claim are impossible to do.

	Arnd

Re: [PATCH v3 0/3] Add I2C support to Broadcom iProc

[Wolfram Sang]

[-- Attachment #1: Type: text/plain, Size: 779 bytes --]

Hi,

please don't drop the i2c-list.

> I guess you are probably extremely busy and might not have had a chance to
> look into the iProc I2C driver v3 patch that was submitted on December 9.
> I'm not trying to rush it, and am perfectly fine with waiting longer. I
> understand subsystem maintainers like you are usually very busy.

True, true.

> As I'm quite new to the upstreaming process, here I'd just like to find out
> in a bit more details on what to expect and how to proceed forward.

We are in the merge window currently, and I will start looking at new
patches probably around rc2 or so.

If you want to speed up things, check the reviews of other new drivers I
did in the recent past and check if some of the remarks also apply to
your driver.

Thanks,

   Wolfram


[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 819 bytes --]

Re: [PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Arnd Bergmann]

On Monday 15 December 2014 13:35:47 Ray Jui wrote:
> 
> Like I said previously, dynamic GPIO allocation works fine in the 
> kernel, as long as all of our GPIO clients in the kernel use gpiod based 
> API, which is what we will enforce going forward. The only problem is 
> with some of our customers who use GPIO through sysfs and expect fixed 
> global GPIO numbers. Thinking about this more, it's probably not that 
> difficult to add a script for those customers to convert/map the GPIO 
> numbers based on readings parsed from sysfs, so I guess that's fine.
> 

I think we discussed the user space interface a number of times
in the past, but I forgot the outcome. Either there is already
a way to name gpio lines uniquely in sysfs, or there should be
one.

Can you reach the gpio interfaces using /sys/devices/0001234.bus/1234566.gpiocontroller/...? 

	Arnd

[PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Arnd Bergmann]

On Monday 15 December 2014 13:35:47 Ray Jui wrote:
> 
> Like I said previously, dynamic GPIO allocation works fine in the 
> kernel, as long as all of our GPIO clients in the kernel use gpiod based 
> API, which is what we will enforce going forward. The only problem is 
> with some of our customers who use GPIO through sysfs and expect fixed 
> global GPIO numbers. Thinking about this more, it's probably not that 
> difficult to add a script for those customers to convert/map the GPIO 
> numbers based on readings parsed from sysfs, so I guess that's fine.
> 

I think we discussed the user space interface a number of times
in the past, but I forgot the outcome. Either there is already
a way to name gpio lines uniquely in sysfs, or there should be
one.

Can you reach the gpio interfaces using /sys/devices/0001234.bus/1234566.gpiocontroller/...? 

	Arnd

Re: [PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

On 12/15/2014 1:57 PM, Arnd Bergmann wrote:
> On Monday 15 December 2014 13:35:47 Ray Jui wrote:
>>
>> Like I said previously, dynamic GPIO allocation works fine in the
>> kernel, as long as all of our GPIO clients in the kernel use gpiod based
>> API, which is what we will enforce going forward. The only problem is
>> with some of our customers who use GPIO through sysfs and expect fixed
>> global GPIO numbers. Thinking about this more, it's probably not that
>> difficult to add a script for those customers to convert/map the GPIO
>> numbers based on readings parsed from sysfs, so I guess that's fine.
>>
>
> I think we discussed the user space interface a number of times
> in the past, but I forgot the outcome. Either there is already
> a way to name gpio lines uniquely in sysfs, or there should be
> one.
>
> Can you reach the gpio interfaces using /sys/devices/0001234.bus/1234566.gpiocontroller/...?
>
> 	Arnd
>
We use entries under /sys/class/gpio/ to control GPIOs. All base, label, 
and ngpio info specific to a GPIO controller can be found there.

Re: [PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

On 12/15/2014 1:57 PM, Arnd Bergmann wrote:
> On Monday 15 December 2014 13:35:47 Ray Jui wrote:
>>
>> Like I said previously, dynamic GPIO allocation works fine in the
>> kernel, as long as all of our GPIO clients in the kernel use gpiod based
>> API, which is what we will enforce going forward. The only problem is
>> with some of our customers who use GPIO through sysfs and expect fixed
>> global GPIO numbers. Thinking about this more, it's probably not that
>> difficult to add a script for those customers to convert/map the GPIO
>> numbers based on readings parsed from sysfs, so I guess that's fine.
>>
>
> I think we discussed the user space interface a number of times
> in the past, but I forgot the outcome. Either there is already
> a way to name gpio lines uniquely in sysfs, or there should be
> one.
>
> Can you reach the gpio interfaces using /sys/devices/0001234.bus/1234566.gpiocontroller/...?
>
> 	Arnd
>
We use entries under /sys/class/gpio/ to control GPIOs. All base, label, 
and ngpio info specific to a GPIO controller can be found there.

[PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

On 12/15/2014 1:57 PM, Arnd Bergmann wrote:
> On Monday 15 December 2014 13:35:47 Ray Jui wrote:
>>
>> Like I said previously, dynamic GPIO allocation works fine in the
>> kernel, as long as all of our GPIO clients in the kernel use gpiod based
>> API, which is what we will enforce going forward. The only problem is
>> with some of our customers who use GPIO through sysfs and expect fixed
>> global GPIO numbers. Thinking about this more, it's probably not that
>> difficult to add a script for those customers to convert/map the GPIO
>> numbers based on readings parsed from sysfs, so I guess that's fine.
>>
>
> I think we discussed the user space interface a number of times
> in the past, but I forgot the outcome. Either there is already
> a way to name gpio lines uniquely in sysfs, or there should be
> one.
>
> Can you reach the gpio interfaces using /sys/devices/0001234.bus/1234566.gpiocontroller/...?
>
> 	Arnd
>
We use entries under /sys/class/gpio/ to control GPIOs. All base, label, 
and ngpio info specific to a GPIO controller can be found there.

Re: [PATCH v3 0/3] Add I2C support to Broadcom iProc

[Ray Jui]

Hi Wolfram,

Thanks for the reply. I'll go through your recent reviews and if I find 
any comment that applies to my driver I'll make the change.

Thanks,

Ray

On 12/15/2014 1:55 PM, Wolfram Sang wrote:
> Hi,
>
> please don't drop the i2c-list.
>
>> I guess you are probably extremely busy and might not have had a chance to
>> look into the iProc I2C driver v3 patch that was submitted on December 9.
>> I'm not trying to rush it, and am perfectly fine with waiting longer. I
>> understand subsystem maintainers like you are usually very busy.
>
> True, true.
>
>> As I'm quite new to the upstreaming process, here I'd just like to find out
>> in a bit more details on what to expect and how to proceed forward.
>
> We are in the merge window currently, and I will start looking at new
> patches probably around rc2 or so.
>
> If you want to speed up things, check the reviews of other new drivers I
> did in the recent past and check if some of the remarks also apply to
> your driver.
>
> Thanks,
>
>     Wolfram
>

Re: [PATCH v2 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Ray Jui]

On 12/15/2014 1:37 PM, Arnd Bergmann wrote:
> On Monday 15 December 2014 11:16:31 Ray Jui wrote:
>> On 12/12/2014 9:21 AM, Arnd Bergmann wrote:
>>> On Friday 12 December 2014 09:08:48 Ray Jui wrote:
>>> One way to solve this would be by turning the driver into a library
>>> the same way as the pcie-dw driver, and have separate front-ends
>>> for it for platform_device and bcma_device.
>>>
>> I'm fine with this solution, i.e., to introduce a common pcie-iproc core
>> driver (just like pcie-designware) and have different front-ends
>> depending on the device/bus type. If we end up deciding to go with this
>> solution, I need to discuss with Hauke to come up with a plan to
>> collaborate.
>
> Ok
>
>> But before we choose to go with that route, may I ask, what is the
>> purpose of tying a PCIe host driver to BCMA? What benefit does BCMA give
>> us? If we have a generic platform based PCIe driver that can work on all
>> iProc SoCs + BCM4708 and BCM5301X with all HW specific configurations
>> taken care of by device tree, why do we still need to use BCMA?
>>
>> I thought all a BCMA device here does is to auto-instantiate based on
>> some register readings?
>
> Basically, DT is a hack that we only need for nondiscoverable buses.
> As BCMA is (mostly) discoverable, we should use that, just like we do
> for things like PCI and USB. There are clearly some limitations to
> BCMA as well, e.g. on bcm4708 we don't have proper IRQ numbers in
> the device list and we need to work around that using DT, but overall
> it still seems to have more upsides than downsides to use it.
>
> It's also good to point other SoC makers to Broadcom as a good example
> for how to do things they claim are impossible to do.
>
> 	Arnd
>
Okay. Fair enough. Let's go with your proposal to create a generic 
driver pcie-iproc to be used by both bcma and platform bus. I'll 
initiate another email thread with you, Hauke, Scott, and me. We can 
discuss how to collaborate on that email thread.

Thanks.

Re: [PATCH v2 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Ray Jui]

On 12/15/2014 1:37 PM, Arnd Bergmann wrote:
> On Monday 15 December 2014 11:16:31 Ray Jui wrote:
>> On 12/12/2014 9:21 AM, Arnd Bergmann wrote:
>>> On Friday 12 December 2014 09:08:48 Ray Jui wrote:
>>> One way to solve this would be by turning the driver into a library
>>> the same way as the pcie-dw driver, and have separate front-ends
>>> for it for platform_device and bcma_device.
>>>
>> I'm fine with this solution, i.e., to introduce a common pcie-iproc core
>> driver (just like pcie-designware) and have different front-ends
>> depending on the device/bus type. If we end up deciding to go with this
>> solution, I need to discuss with Hauke to come up with a plan to
>> collaborate.
>
> Ok
>
>> But before we choose to go with that route, may I ask, what is the
>> purpose of tying a PCIe host driver to BCMA? What benefit does BCMA give
>> us? If we have a generic platform based PCIe driver that can work on all
>> iProc SoCs + BCM4708 and BCM5301X with all HW specific configurations
>> taken care of by device tree, why do we still need to use BCMA?
>>
>> I thought all a BCMA device here does is to auto-instantiate based on
>> some register readings?
>
> Basically, DT is a hack that we only need for nondiscoverable buses.
> As BCMA is (mostly) discoverable, we should use that, just like we do
> for things like PCI and USB. There are clearly some limitations to
> BCMA as well, e.g. on bcm4708 we don't have proper IRQ numbers in
> the device list and we need to work around that using DT, but overall
> it still seems to have more upsides than downsides to use it.
>
> It's also good to point other SoC makers to Broadcom as a good example
> for how to do things they claim are impossible to do.
>
> 	Arnd
>
Okay. Fair enough. Let's go with your proposal to create a generic 
driver pcie-iproc to be used by both bcma and platform bus. I'll 
initiate another email thread with you, Hauke, Scott, and me. We can 
discuss how to collaborate on that email thread.

Thanks.

[PATCH v2 2/4] PCI: iproc: Add Broadcom iProc PCIe driver

[Ray Jui]

On 12/15/2014 1:37 PM, Arnd Bergmann wrote:
> On Monday 15 December 2014 11:16:31 Ray Jui wrote:
>> On 12/12/2014 9:21 AM, Arnd Bergmann wrote:
>>> On Friday 12 December 2014 09:08:48 Ray Jui wrote:
>>> One way to solve this would be by turning the driver into a library
>>> the same way as the pcie-dw driver, and have separate front-ends
>>> for it for platform_device and bcma_device.
>>>
>> I'm fine with this solution, i.e., to introduce a common pcie-iproc core
>> driver (just like pcie-designware) and have different front-ends
>> depending on the device/bus type. If we end up deciding to go with this
>> solution, I need to discuss with Hauke to come up with a plan to
>> collaborate.
>
> Ok
>
>> But before we choose to go with that route, may I ask, what is the
>> purpose of tying a PCIe host driver to BCMA? What benefit does BCMA give
>> us? If we have a generic platform based PCIe driver that can work on all
>> iProc SoCs + BCM4708 and BCM5301X with all HW specific configurations
>> taken care of by device tree, why do we still need to use BCMA?
>>
>> I thought all a BCMA device here does is to auto-instantiate based on
>> some register readings?
>
> Basically, DT is a hack that we only need for nondiscoverable buses.
> As BCMA is (mostly) discoverable, we should use that, just like we do
> for things like PCI and USB. There are clearly some limitations to
> BCMA as well, e.g. on bcm4708 we don't have proper IRQ numbers in
> the device list and we need to work around that using DT, but overall
> it still seems to have more upsides than downsides to use it.
>
> It's also good to point other SoC makers to Broadcom as a good example
> for how to do things they claim are impossible to do.
>
> 	Arnd
>
Okay. Fair enough. Let's go with your proposal to create a generic 
driver pcie-iproc to be used by both bcma and platform bus. I'll 
initiate another email thread with you, Hauke, Scott, and me. We can 
discuss how to collaborate on that email thread.

Thanks.

[PATCH v6 0/3] Add gpio support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial GPIO support for the Broadcom Cygnus SoC.
Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
the same Cygnus GPIO driver

Changes from v5:
 - Get rid of DT property "linux,gpio-base". Use dynamic allocation for GPIO base
   number

Changes from v4:
 - Use DT property "linux,gpio-base" to define GPIO base number
 - factorize common code to improve code readability and reduce code size
 - remove "bcm_" prefix on function and struct names
 - improve debugging prints
 - default GPIO_BCM_CYGNUS to y in Kconfig (it still depends on
   ARCH_BCM_CYGNUS). This way we do not need to select it from the
   arch/arm/mach-bcm/Kconfig
 - Get rid of redundant MAINTAINER entry for this driver. It will be maintained
   by Broadcom iProc/Cygnus maintainers
 - Update device tree document based on driver changes

Changes from v3:
 - Fix dt property tpyo
 - Fix incorrect GPIO compatible ID in device tree binding document example

Changes from v2:
 - Consolidate different compatible IDs into "brcm,cygnus-gpio"
 - Get rid of redundant "no-interrupt" property

Changes from v1:
 - Get rid of inline qualifier
 - Get rid of redundant check in the ISR
 - Other minor fixes to imrove code readability

Ray Jui (3):
  gpio: Cygnus: define Broadcom Cygnus GPIO binding
  gpio: Cygnus: add GPIO driver
  ARM: dts: enable GPIO for Broadcom Cygnus

 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   82 +++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   30 +
 drivers/gpio/Kconfig                               |   12 +
 drivers/gpio/Makefile                              |    1 +
 drivers/gpio/gpio-bcm-cygnus.c                     |  607 ++++++++++++++++++++
 5 files changed, 732 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

-- 
1.7.9.5

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[PATCH v6 0/3] Add gpio support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial GPIO support for the Broadcom Cygnus SoC.
Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
the same Cygnus GPIO driver

Changes from v5:
 - Get rid of DT property "linux,gpio-base". Use dynamic allocation for GPIO base
   number

Changes from v4:
 - Use DT property "linux,gpio-base" to define GPIO base number
 - factorize common code to improve code readability and reduce code size
 - remove "bcm_" prefix on function and struct names
 - improve debugging prints
 - default GPIO_BCM_CYGNUS to y in Kconfig (it still depends on
   ARCH_BCM_CYGNUS). This way we do not need to select it from the
   arch/arm/mach-bcm/Kconfig
 - Get rid of redundant MAINTAINER entry for this driver. It will be maintained
   by Broadcom iProc/Cygnus maintainers
 - Update device tree document based on driver changes

Changes from v3:
 - Fix dt property tpyo
 - Fix incorrect GPIO compatible ID in device tree binding document example

Changes from v2:
 - Consolidate different compatible IDs into "brcm,cygnus-gpio"
 - Get rid of redundant "no-interrupt" property

Changes from v1:
 - Get rid of inline qualifier
 - Get rid of redundant check in the ISR
 - Other minor fixes to imrove code readability

Ray Jui (3):
  gpio: Cygnus: define Broadcom Cygnus GPIO binding
  gpio: Cygnus: add GPIO driver
  ARM: dts: enable GPIO for Broadcom Cygnus

 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   82 +++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   30 +
 drivers/gpio/Kconfig                               |   12 +
 drivers/gpio/Makefile                              |    1 +
 drivers/gpio/gpio-bcm-cygnus.c                     |  607 ++++++++++++++++++++
 5 files changed, 732 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

-- 
1.7.9.5

[PATCH v6 0/3] Add gpio support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial GPIO support for the Broadcom Cygnus SoC.
Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
the same Cygnus GPIO driver

Changes from v5:
 - Get rid of DT property "linux,gpio-base". Use dynamic allocation for GPIO base
   number

Changes from v4:
 - Use DT property "linux,gpio-base" to define GPIO base number
 - factorize common code to improve code readability and reduce code size
 - remove "bcm_" prefix on function and struct names
 - improve debugging prints
 - default GPIO_BCM_CYGNUS to y in Kconfig (it still depends on
   ARCH_BCM_CYGNUS). This way we do not need to select it from the
   arch/arm/mach-bcm/Kconfig
 - Get rid of redundant MAINTAINER entry for this driver. It will be maintained
   by Broadcom iProc/Cygnus maintainers
 - Update device tree document based on driver changes

Changes from v3:
 - Fix dt property tpyo
 - Fix incorrect GPIO compatible ID in device tree binding document example

Changes from v2:
 - Consolidate different compatible IDs into "brcm,cygnus-gpio"
 - Get rid of redundant "no-interrupt" property

Changes from v1:
 - Get rid of inline qualifier
 - Get rid of redundant check in the ISR
 - Other minor fixes to imrove code readability

Ray Jui (3):
  gpio: Cygnus: define Broadcom Cygnus GPIO binding
  gpio: Cygnus: add GPIO driver
  ARM: dts: enable GPIO for Broadcom Cygnus

 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   82 +++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   30 +
 drivers/gpio/Kconfig                               |   12 +
 drivers/gpio/Makefile                              |    1 +
 drivers/gpio/gpio-bcm-cygnus.c                     |  607 ++++++++++++++++++++
 5 files changed, 732 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

-- 
1.7.9.5

[PATCH v6 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

Document the GPIO device tree binding for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   82 ++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt

diff --git a/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
new file mode 100644
index 0000000..dca322a
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
@@ -0,0 +1,82 @@
+Broadcom Cygnus GPIO Controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,cygnus-gpio"
+
+- reg:
+    Define the base and range of the I/O address space that contain the Cygnus
+GPIO controller registers
+
+- ngpios:
+    Total number of GPIOs the controller provides
+
+- #gpio-cells:
+    Must be two. The first cell is the GPIO pin number (within the
+controller's domain) and the second cell is used for the following:
+    bit[0]: polarity (0 for normal and 1 for inverted)
+    bit[18:16]: internal pull up/down: 0 - pull up/down disabled
+                                       1 - pull up enabled
+                                       2 - pull down enabled
+    bit[22:20]: drive strength: 0 - 2 mA
+                                1 - 4 mA
+                                2 - 6 mA
+                                3 - 8 mA
+                                4 - 10 mA
+                                5 - 12 mA
+                                6 - 14 mA
+                                7 - 16 mA
+
+- gpio-controller:
+    Specifies that the node is a GPIO controller
+
+Optional properties:
+
+- interrupt-controller:
+    Specifies that the node is an interrupt controller. Not all Cygnus GPIO
+interfaces support interrupt, e.g., the CRMU GPIO controller does not have its
+interrupt routed to the main processor's GIC
+
+- interrupts:
+    The interrupt outputs from the GPIO controller.
+
+- no-drv-strength:
+    Specifies the GPIO controller does not support drive strength configuration
+
+Example:
+	gpio_asiu: gpio@180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio@03024800 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-drv-strength;
+	};
+
+	/*
+	 * Touchscreen that uses the ASIU GPIO 100, with internal pull-up
+	 * enabled
+	 */
+	tsc {
+		...
+		...
+		gpio-event = <&gpio_asiu 100 0x10000>;
+	};
+
+	/* Bluetooth that uses the CRMU GPIO 2, with polarity inverted */
+	bluetooth {
+		...
+		...
+		bcm,rfkill-bank-sel = <&gpio_crmu 2 1>
+	}
-- 
1.7.9.5

[PATCH v6 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

Document the GPIO device tree binding for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   82 ++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt

diff --git a/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
new file mode 100644
index 0000000..dca322a
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
@@ -0,0 +1,82 @@
+Broadcom Cygnus GPIO Controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,cygnus-gpio"
+
+- reg:
+    Define the base and range of the I/O address space that contain the Cygnus
+GPIO controller registers
+
+- ngpios:
+    Total number of GPIOs the controller provides
+
+- #gpio-cells:
+    Must be two. The first cell is the GPIO pin number (within the
+controller's domain) and the second cell is used for the following:
+    bit[0]: polarity (0 for normal and 1 for inverted)
+    bit[18:16]: internal pull up/down: 0 - pull up/down disabled
+                                       1 - pull up enabled
+                                       2 - pull down enabled
+    bit[22:20]: drive strength: 0 - 2 mA
+                                1 - 4 mA
+                                2 - 6 mA
+                                3 - 8 mA
+                                4 - 10 mA
+                                5 - 12 mA
+                                6 - 14 mA
+                                7 - 16 mA
+
+- gpio-controller:
+    Specifies that the node is a GPIO controller
+
+Optional properties:
+
+- interrupt-controller:
+    Specifies that the node is an interrupt controller. Not all Cygnus GPIO
+interfaces support interrupt, e.g., the CRMU GPIO controller does not have its
+interrupt routed to the main processor's GIC
+
+- interrupts:
+    The interrupt outputs from the GPIO controller.
+
+- no-drv-strength:
+    Specifies the GPIO controller does not support drive strength configuration
+
+Example:
+	gpio_asiu: gpio@180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio@03024800 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-drv-strength;
+	};
+
+	/*
+	 * Touchscreen that uses the ASIU GPIO 100, with internal pull-up
+	 * enabled
+	 */
+	tsc {
+		...
+		...
+		gpio-event = <&gpio_asiu 100 0x10000>;
+	};
+
+	/* Bluetooth that uses the CRMU GPIO 2, with polarity inverted */
+	bluetooth {
+		...
+		...
+		bcm,rfkill-bank-sel = <&gpio_crmu 2 1>
+	}
-- 
1.7.9.5

[PATCH v6 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

Document the GPIO device tree binding for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/gpio/brcm,cygnus-gpio.txt  |   82 ++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt

diff --git a/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
new file mode 100644
index 0000000..dca322a
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/brcm,cygnus-gpio.txt
@@ -0,0 +1,82 @@
+Broadcom Cygnus GPIO Controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,cygnus-gpio"
+
+- reg:
+    Define the base and range of the I/O address space that contain the Cygnus
+GPIO controller registers
+
+- ngpios:
+    Total number of GPIOs the controller provides
+
+- #gpio-cells:
+    Must be two. The first cell is the GPIO pin number (within the
+controller's domain) and the second cell is used for the following:
+    bit[0]: polarity (0 for normal and 1 for inverted)
+    bit[18:16]: internal pull up/down: 0 - pull up/down disabled
+                                       1 - pull up enabled
+                                       2 - pull down enabled
+    bit[22:20]: drive strength: 0 - 2 mA
+                                1 - 4 mA
+                                2 - 6 mA
+                                3 - 8 mA
+                                4 - 10 mA
+                                5 - 12 mA
+                                6 - 14 mA
+                                7 - 16 mA
+
+- gpio-controller:
+    Specifies that the node is a GPIO controller
+
+Optional properties:
+
+- interrupt-controller:
+    Specifies that the node is an interrupt controller. Not all Cygnus GPIO
+interfaces support interrupt, e.g., the CRMU GPIO controller does not have its
+interrupt routed to the main processor's GIC
+
+- interrupts:
+    The interrupt outputs from the GPIO controller.
+
+- no-drv-strength:
+    Specifies the GPIO controller does not support drive strength configuration
+
+Example:
+	gpio_asiu: gpio at 180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio at 03024800 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-drv-strength;
+	};
+
+	/*
+	 * Touchscreen that uses the ASIU GPIO 100, with internal pull-up
+	 * enabled
+	 */
+	tsc {
+		...
+		...
+		gpio-event = <&gpio_asiu 100 0x10000>;
+	};
+
+	/* Bluetooth that uses the CRMU GPIO 2, with polarity inverted */
+	bluetooth {
+		...
+		...
+		bcm,rfkill-bank-sel = <&gpio_crmu 2 1>
+	}
-- 
1.7.9.5

[PATCH v6 2/3] gpio: Cygnus: add GPIO driver

[Ray Jui]

This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller, 2) the
chipCommonG GPIO controller, and 3) the ALWAYS-ON GPIO controller

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/gpio/Kconfig           |   12 +
 drivers/gpio/Makefile          |    1 +
 drivers/gpio/gpio-bcm-cygnus.c |  607 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 620 insertions(+)
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 633ec21..1790ffd 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -126,6 +126,18 @@ config GPIO_74XX_MMIO
 	    8 bits:	74244 (Input), 74273 (Output)
 	    16 bits:	741624 (Input), 7416374 (Output)
 
+config GPIO_BCM_CYGNUS
+	bool "Broadcom Cygnus GPIO support"
+	depends on ARCH_BCM_CYGNUS && OF_GPIO
+	default y
+	help
+	  Say yes here to turn on GPIO support for Broadcom Cygnus SoC
+
+	  The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
+	  GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
+	  the always-ON GPIO controller (CRMU). All 3 GPIO controllers are
+	  supported by this driver
+
 config GPIO_CLPS711X
 	tristate "CLPS711X GPIO support"
 	depends on ARCH_CLPS711X || COMPILE_TEST
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 81755f1..31eb7e0 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_GPIO_ADP5520)	+= gpio-adp5520.o
 obj-$(CONFIG_GPIO_ADP5588)	+= gpio-adp5588.o
 obj-$(CONFIG_GPIO_AMD8111)	+= gpio-amd8111.o
 obj-$(CONFIG_GPIO_ARIZONA)	+= gpio-arizona.o
+obj-$(CONFIG_GPIO_BCM_CYGNUS)	+= gpio-bcm-cygnus.o
 obj-$(CONFIG_GPIO_BCM_KONA)	+= gpio-bcm-kona.o
 obj-$(CONFIG_GPIO_BT8XX)	+= gpio-bt8xx.o
 obj-$(CONFIG_GPIO_CLPS711X)	+= gpio-clps711x.o
diff --git a/drivers/gpio/gpio-bcm-cygnus.c b/drivers/gpio/gpio-bcm-cygnus.c
new file mode 100644
index 0000000..817bc9a
--- /dev/null
+++ b/drivers/gpio/gpio-bcm-cygnus.c
@@ -0,0 +1,607 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/ioport.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/irqchip/chained_irq.h>
+
+#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
+#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
+#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
+#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
+#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
+#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
+#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
+#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
+#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
+#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
+#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
+#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
+
+/* drive strength control for ASIU GPIO */
+#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
+
+/* drive strength control for CCM GPIO */
+#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00
+
+#define GPIO_BANK_SIZE 0x200
+#define NGPIOS_PER_BANK 32
+#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
+
+#define CYGNUS_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + (reg))
+#define CYGNUS_GPIO_SHIFT(pin) ((pin) % NGPIOS_PER_BANK)
+
+#define GPIO_FLAG_BIT_MASK           0xffff
+#define GPIO_PULL_BIT_SHIFT          16
+#define GPIO_PULL_BIT_MASK           0x3
+
+#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
+#define GPIO_DRV_STRENGTH_BITS       3
+#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
+
+/*
+ * For GPIO internal pull up/down registers
+ */
+enum gpio_pull {
+	GPIO_PULL_NONE = 0,
+	GPIO_PULL_UP,
+	GPIO_PULL_DOWN,
+	GPIO_PULL_INVALID,
+};
+
+/*
+ * GPIO drive strength
+ */
+enum gpio_drv_strength {
+	GPIO_DRV_STRENGTH_2MA = 0,
+	GPIO_DRV_STRENGTH_4MA,
+	GPIO_DRV_STRENGTH_6MA,
+	GPIO_DRV_STRENGTH_8MA,
+	GPIO_DRV_STRENGTH_10MA,
+	GPIO_DRV_STRENGTH_12MA,
+	GPIO_DRV_STRENGTH_14MA,
+	GPIO_DRV_STRENGTH_16MA,
+	GPIO_DRV_STRENGTH_INVALID,
+};
+
+struct cygnus_gpio {
+	struct device *dev;
+	void __iomem *base;
+	void __iomem *io_ctrl;
+	spinlock_t lock;
+	struct gpio_chip gc;
+	unsigned num_banks;
+	int irq;
+	struct irq_domain *irq_domain;
+};
+
+static struct cygnus_gpio *to_cygnus_gpio(struct gpio_chip *gc)
+{
+	return container_of(gc, struct cygnus_gpio, gc);
+}
+
+static u32 cygnus_readl(struct cygnus_gpio *cygnus_gpio, unsigned int offset)
+{
+	return readl(cygnus_gpio->base + offset);
+}
+
+static void cygnus_writel(struct cygnus_gpio *cygnus_gpio,
+			  unsigned int offset, u32 val)
+{
+	writel(val, cygnus_gpio->base + offset);
+}
+
+/**
+ *  cygnus_set_bit - set or clear one bit (corresponding to the GPIO pin) in a
+ *  Cygnus GPIO register
+ *
+ *  @cygnus_gpio: Cygnus GPIO device
+ *  @reg: register offset
+ *  @gpio: GPIO pin
+ *  @set: set or clear. 1 - set; 0 -clear
+ */
+static void cygnus_set_bit(struct cygnus_gpio *cygnus_gpio,
+			   unsigned int reg, unsigned gpio, int set)
+{
+	unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val;
+
+	val = cygnus_readl(cygnus_gpio, offset);
+	if (set)
+		val |= BIT(shift);
+	else
+		val &= ~BIT(shift);
+	cygnus_writel(cygnus_gpio, offset, val);
+}
+
+static int cygnus_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+
+	return irq_find_mapping(cygnus_gpio->irq_domain, offset);
+}
+
+static void cygnus_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+	struct cygnus_gpio *cygnus_gpio;
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	int i, bit;
+
+	chained_irq_enter(chip, desc);
+
+	cygnus_gpio = irq_get_handler_data(irq);
+
+	/* go through the entire GPIO banks and handle all interrupts */
+	for (i = 0; i < cygnus_gpio->num_banks; i++) {
+		unsigned long val = cygnus_readl(cygnus_gpio,
+				(i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_MSTAT_OFFSET);
+
+		for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
+			unsigned pin = NGPIOS_PER_BANK * i + bit;
+			int child_irq =
+				cygnus_gpio_to_irq(&cygnus_gpio->gc, pin);
+
+			/*
+			 * Clear the interrupt before invoking the
+			 * handler, so we do not leave any window
+			 */
+			cygnus_writel(cygnus_gpio, (i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_CLR_OFFSET, BIT(bit));
+
+			generic_handle_irq(child_irq);
+		}
+	}
+
+	chained_irq_exit(chip, desc);
+}
+
+
+static void cygnus_gpio_irq_ack(struct irq_data *d)
+{
+	struct cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset = CYGNUS_GPIO_REG(gpio,
+			CYGNUS_GPIO_INT_CLR_OFFSET);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val = BIT(shift);
+
+	cygnus_writel(cygnus_gpio, offset, val);
+}
+
+/**
+ *  cygnus_gpio_irq_set_mask - mask/unmask a GPIO interrupt
+ *
+ *  @d: IRQ chip data
+ *  @mask: mask/unmask GPIO interrupt. 0 - mask (disable); 1 - unmask (enable)
+ */
+static void cygnus_gpio_irq_set_mask(struct irq_data *d, int mask)
+{
+	struct cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_INT_MSK_OFFSET, gpio, mask);
+}
+
+static void cygnus_gpio_irq_mask(struct irq_data *d)
+{
+	struct cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_gpio_irq_set_mask(d, 0);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static void cygnus_gpio_irq_unmask(struct irq_data *d)
+{
+	struct cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_gpio_irq_set_mask(d, 1);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static int cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+	struct cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	int int_type = 0, dual_edge = 0, edge_lvl = 0;
+	unsigned long flags;
+
+	switch (type & IRQ_TYPE_SENSE_MASK) {
+	case IRQ_TYPE_EDGE_RISING:
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_EDGE_FALLING:
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		dual_edge = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_HIGH:
+		int_type = 1;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_LOW:
+		int_type = 1;
+		break;
+
+	default:
+		dev_err(cygnus_gpio->dev, "invalid GPIO IRQ type 0x%x\n",
+				type);
+		return -EINVAL;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_IN_TYPE_OFFSET, gpio,
+			int_type);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_INT_DE_OFFSET, gpio,
+			dual_edge);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_INT_EDGE_OFFSET, gpio,
+			edge_lvl);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+		"gpio:%u set int_type:%d dual_edge:%d edge_lvl:%d\n",
+		gpio, int_type, dual_edge, edge_lvl);
+
+	return 0;
+}
+
+static struct irq_chip cygnus_gpio_irq_chip = {
+	.name = "bcm-cygnus-gpio",
+	.irq_ack = cygnus_gpio_irq_ack,
+	.irq_mask = cygnus_gpio_irq_mask,
+	.irq_unmask = cygnus_gpio_irq_unmask,
+	.irq_set_type = cygnus_gpio_irq_set_type,
+};
+
+static int cygnus_gpio_direction_input(struct gpio_chip *gc, unsigned gpio)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 0);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u set input\n", gpio);
+
+	return 0;
+}
+
+static int cygnus_gpio_direction_output(struct gpio_chip *gc,
+		unsigned gpio, int value)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 1);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u set output, value:%d\n",
+			gpio, value);
+
+	return 0;
+}
+
+static void cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio,
+		int value)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u set, value:%d\n", gpio, value);
+}
+
+static int cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+	unsigned int offset = CYGNUS_GPIO_REG(gpio,
+			CYGNUS_GPIO_DATA_IN_OFFSET);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val;
+
+	val = cygnus_readl(cygnus_gpio, offset);
+	val = (val >> shift) & 1;
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u get, value:%d\n", gpio, val);
+
+	return val;
+}
+
+static struct lock_class_key gpio_lock_class;
+
+static int cygnus_gpio_irq_map(struct irq_domain *d, unsigned int irq,
+			       irq_hw_number_t hwirq)
+{
+	int ret;
+
+	ret = irq_set_chip_data(irq, d->host_data);
+	if (ret < 0)
+		return ret;
+	irq_set_lockdep_class(irq, &gpio_lock_class);
+	irq_set_chip_and_handler(irq, &cygnus_gpio_irq_chip,
+			handle_simple_irq);
+	set_irq_flags(irq, IRQF_VALID);
+
+	return 0;
+}
+
+static void cygnus_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
+{
+	irq_set_chip_and_handler(irq, NULL, NULL);
+	irq_set_chip_data(irq, NULL);
+}
+
+static struct irq_domain_ops cygnus_irq_ops = {
+	.map = cygnus_gpio_irq_map,
+	.unmap = cygnus_gpio_irq_unmap,
+	.xlate = irq_domain_xlate_twocell,
+};
+
+#ifdef CONFIG_OF_GPIO
+static void cygnus_gpio_set_pull(struct cygnus_gpio *cygnus_gpio,
+				 unsigned gpio, enum gpio_pull pull)
+{
+	int pullup;
+	unsigned long flags;
+
+	switch (pull) {
+	case GPIO_PULL_UP:
+		pullup = 1;
+		break;
+	case GPIO_PULL_DOWN:
+		pullup = 0;
+		break;
+	case GPIO_PULL_NONE:
+	case GPIO_PULL_INVALID:
+	default:
+		return;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	/* set pull up/down */
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_PAD_RES_OFFSET, gpio, pullup);
+	/* enable pad */
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_RES_EN_OFFSET, gpio, 1);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u set pullup:%d\n", gpio, pullup);
+}
+
+static void cygnus_gpio_set_strength(struct cygnus_gpio *cygnus_gpio,
+		unsigned gpio, enum gpio_drv_strength strength)
+{
+	struct device *dev = cygnus_gpio->dev;
+	void __iomem *base;
+	unsigned int i, offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	/* some GPIO controllers do not support drive strength configuration */
+	if (of_find_property(dev->of_node, "no-drv-strength", NULL))
+		return;
+
+	/*
+	 * Some GPIO controllers use a different register block for drive
+	 * strength control
+	 */
+	if (cygnus_gpio->io_ctrl) {
+		base = cygnus_gpio->io_ctrl;
+		offset = CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET;
+	} else {
+		base = cygnus_gpio->base;
+		offset = CYGNUS_GPIO_REG(gpio,
+				CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET);
+	}
+
+	shift = CYGNUS_GPIO_SHIFT(gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
+		val = readl(base + offset);
+		val &= ~BIT(shift);
+		val |= ((strength >> i) & 0x1) << shift;
+		writel(val, base + offset);
+		offset += 4;
+	}
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+			"gpio:%u set drive strength:%d\n", gpio, strength);
+}
+
+static int cygnus_gpio_of_xlate(struct gpio_chip *gc,
+		const struct of_phandle_args *gpiospec, u32 *flags)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+	enum gpio_pull pull;
+	enum gpio_drv_strength strength;
+
+	if (gc->of_gpio_n_cells < 2)
+		return -EINVAL;
+
+	if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
+		return -EINVAL;
+
+	if (gpiospec->args[0] >= gc->ngpio)
+		return -EINVAL;
+
+	pull = (gpiospec->args[1] >> GPIO_PULL_BIT_SHIFT) & GPIO_PULL_BIT_MASK;
+	if (WARN_ON(pull >= GPIO_PULL_INVALID))
+		return -EINVAL;
+
+	strength = (gpiospec->args[1] >> GPIO_DRV_STRENGTH_BIT_SHIFT) &
+		GPIO_DRV_STRENGTH_BIT_MASK;
+
+	if (flags)
+		*flags = gpiospec->args[1] & GPIO_FLAG_BIT_MASK;
+
+	cygnus_gpio_set_pull(cygnus_gpio, gpiospec->args[0], pull);
+	cygnus_gpio_set_strength(cygnus_gpio, gpiospec->args[0], strength);
+
+	return gpiospec->args[0];
+}
+#endif
+
+static const struct of_device_id cygnus_gpio_of_match[] = {
+	{ .compatible = "brcm,cygnus-gpio" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, cygnus_gpio_of_match);
+
+static int cygnus_gpio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+	struct cygnus_gpio *cygnus_gpio;
+	struct gpio_chip *gc;
+	u32 i, ngpios;
+	int ret;
+
+	cygnus_gpio = devm_kzalloc(dev, sizeof(*cygnus_gpio), GFP_KERNEL);
+	if (!cygnus_gpio)
+		return -ENOMEM;
+
+	cygnus_gpio->dev = dev;
+	platform_set_drvdata(pdev, cygnus_gpio);
+
+	if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
+		dev_err(&pdev->dev, "missing ngpios DT property\n");
+		return -ENODEV;
+	}
+	cygnus_gpio->num_banks = (ngpios + NGPIOS_PER_BANK - 1) /
+		NGPIOS_PER_BANK;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	cygnus_gpio->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(cygnus_gpio->base)) {
+		dev_err(&pdev->dev, "unable to map I/O memory\n");
+		return PTR_ERR(cygnus_gpio->base);
+	}
+
+	/*
+	 * Only certain types of Cygnus GPIO interfaces have I/O control
+	 * registers
+	 */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (res) {
+		cygnus_gpio->io_ctrl = devm_ioremap_resource(dev, res);
+		if (IS_ERR(cygnus_gpio->io_ctrl)) {
+			dev_err(&pdev->dev, "unable to map I/O memory\n");
+			return PTR_ERR(cygnus_gpio->io_ctrl);
+		}
+	}
+
+	spin_lock_init(&cygnus_gpio->lock);
+
+	gc = &cygnus_gpio->gc;
+	gc->base = -1;
+	gc->ngpio = ngpios;
+	gc->label = dev_name(dev);
+	gc->dev = dev;
+#ifdef CONFIG_OF_GPIO
+	gc->of_node = dev->of_node;
+	gc->of_gpio_n_cells = 2;
+	gc->of_xlate = cygnus_gpio_of_xlate;
+#endif
+	gc->direction_input = cygnus_gpio_direction_input;
+	gc->direction_output = cygnus_gpio_direction_output;
+	gc->set = cygnus_gpio_set;
+	gc->get = cygnus_gpio_get;
+	gc->to_irq = cygnus_gpio_to_irq;
+
+	ret = gpiochip_add(gc);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "unable to add GPIO chip\n");
+		return ret;
+	}
+
+	/*
+	 * Some of the GPIO interfaces do not have interrupt wired to the main
+	 * processor
+	 */
+	cygnus_gpio->irq = platform_get_irq(pdev, 0);
+	if (cygnus_gpio->irq < 0) {
+		ret = cygnus_gpio->irq;
+		if (ret == -EPROBE_DEFER)
+			goto err_rm_gpiochip;
+
+		dev_info(&pdev->dev, "no interrupt hook\n");
+	}
+
+	cygnus_gpio->irq_domain = irq_domain_add_linear(dev->of_node,
+			gc->ngpio, &cygnus_irq_ops, cygnus_gpio);
+	if (!cygnus_gpio->irq_domain) {
+		dev_err(&pdev->dev, "unable to allocate IRQ domain\n");
+		ret = -ENXIO;
+		goto err_rm_gpiochip;
+	}
+
+	for (i = 0; i < gc->ngpio; i++) {
+		int irq = irq_create_mapping(cygnus_gpio->irq_domain, i);
+
+		irq_set_lockdep_class(irq, &gpio_lock_class);
+		irq_set_chip_data(irq, cygnus_gpio);
+		irq_set_chip_and_handler(irq, &cygnus_gpio_irq_chip,
+				handle_simple_irq);
+		set_irq_flags(irq, IRQF_VALID);
+	}
+
+	irq_set_chained_handler(cygnus_gpio->irq, cygnus_gpio_irq_handler);
+	irq_set_handler_data(cygnus_gpio->irq, cygnus_gpio);
+
+	return 0;
+
+err_rm_gpiochip:
+	gpiochip_remove(gc);
+	return ret;
+}
+
+static struct platform_driver cygnus_gpio_driver = {
+	.driver = {
+		.name = "bcm-cygnus-gpio",
+		.owner = THIS_MODULE,
+		.of_match_table = cygnus_gpio_of_match,
+	},
+	.probe = cygnus_gpio_probe,
+};
+
+module_platform_driver(cygnus_gpio_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus GPIO Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v6 2/3] gpio: Cygnus: add GPIO driver

[Ray Jui]

This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller, 2) the
chipCommonG GPIO controller, and 3) the ALWAYS-ON GPIO controller

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/gpio/Kconfig           |   12 +
 drivers/gpio/Makefile          |    1 +
 drivers/gpio/gpio-bcm-cygnus.c |  607 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 620 insertions(+)
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 633ec21..1790ffd 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -126,6 +126,18 @@ config GPIO_74XX_MMIO
 	    8 bits:	74244 (Input), 74273 (Output)
 	    16 bits:	741624 (Input), 7416374 (Output)
 
+config GPIO_BCM_CYGNUS
+	bool "Broadcom Cygnus GPIO support"
+	depends on ARCH_BCM_CYGNUS && OF_GPIO
+	default y
+	help
+	  Say yes here to turn on GPIO support for Broadcom Cygnus SoC
+
+	  The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
+	  GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
+	  the always-ON GPIO controller (CRMU). All 3 GPIO controllers are
+	  supported by this driver
+
 config GPIO_CLPS711X
 	tristate "CLPS711X GPIO support"
 	depends on ARCH_CLPS711X || COMPILE_TEST
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 81755f1..31eb7e0 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_GPIO_ADP5520)	+= gpio-adp5520.o
 obj-$(CONFIG_GPIO_ADP5588)	+= gpio-adp5588.o
 obj-$(CONFIG_GPIO_AMD8111)	+= gpio-amd8111.o
 obj-$(CONFIG_GPIO_ARIZONA)	+= gpio-arizona.o
+obj-$(CONFIG_GPIO_BCM_CYGNUS)	+= gpio-bcm-cygnus.o
 obj-$(CONFIG_GPIO_BCM_KONA)	+= gpio-bcm-kona.o
 obj-$(CONFIG_GPIO_BT8XX)	+= gpio-bt8xx.o
 obj-$(CONFIG_GPIO_CLPS711X)	+= gpio-clps711x.o
diff --git a/drivers/gpio/gpio-bcm-cygnus.c b/drivers/gpio/gpio-bcm-cygnus.c
new file mode 100644
index 0000000..817bc9a
--- /dev/null
+++ b/drivers/gpio/gpio-bcm-cygnus.c
@@ -0,0 +1,607 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/ioport.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/irqchip/chained_irq.h>
+
+#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
+#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
+#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
+#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
+#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
+#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
+#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
+#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
+#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
+#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
+#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
+#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
+
+/* drive strength control for ASIU GPIO */
+#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
+
+/* drive strength control for CCM GPIO */
+#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00
+
+#define GPIO_BANK_SIZE 0x200
+#define NGPIOS_PER_BANK 32
+#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
+
+#define CYGNUS_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + (reg))
+#define CYGNUS_GPIO_SHIFT(pin) ((pin) % NGPIOS_PER_BANK)
+
+#define GPIO_FLAG_BIT_MASK           0xffff
+#define GPIO_PULL_BIT_SHIFT          16
+#define GPIO_PULL_BIT_MASK           0x3
+
+#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
+#define GPIO_DRV_STRENGTH_BITS       3
+#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
+
+/*
+ * For GPIO internal pull up/down registers
+ */
+enum gpio_pull {
+	GPIO_PULL_NONE = 0,
+	GPIO_PULL_UP,
+	GPIO_PULL_DOWN,
+	GPIO_PULL_INVALID,
+};
+
+/*
+ * GPIO drive strength
+ */
+enum gpio_drv_strength {
+	GPIO_DRV_STRENGTH_2MA = 0,
+	GPIO_DRV_STRENGTH_4MA,
+	GPIO_DRV_STRENGTH_6MA,
+	GPIO_DRV_STRENGTH_8MA,
+	GPIO_DRV_STRENGTH_10MA,
+	GPIO_DRV_STRENGTH_12MA,
+	GPIO_DRV_STRENGTH_14MA,
+	GPIO_DRV_STRENGTH_16MA,
+	GPIO_DRV_STRENGTH_INVALID,
+};
+
+struct cygnus_gpio {
+	struct device *dev;
+	void __iomem *base;
+	void __iomem *io_ctrl;
+	spinlock_t lock;
+	struct gpio_chip gc;
+	unsigned num_banks;
+	int irq;
+	struct irq_domain *irq_domain;
+};
+
+static struct cygnus_gpio *to_cygnus_gpio(struct gpio_chip *gc)
+{
+	return container_of(gc, struct cygnus_gpio, gc);
+}
+
+static u32 cygnus_readl(struct cygnus_gpio *cygnus_gpio, unsigned int offset)
+{
+	return readl(cygnus_gpio->base + offset);
+}
+
+static void cygnus_writel(struct cygnus_gpio *cygnus_gpio,
+			  unsigned int offset, u32 val)
+{
+	writel(val, cygnus_gpio->base + offset);
+}
+
+/**
+ *  cygnus_set_bit - set or clear one bit (corresponding to the GPIO pin) in a
+ *  Cygnus GPIO register
+ *
+ *  @cygnus_gpio: Cygnus GPIO device
+ *  @reg: register offset
+ *  @gpio: GPIO pin
+ *  @set: set or clear. 1 - set; 0 -clear
+ */
+static void cygnus_set_bit(struct cygnus_gpio *cygnus_gpio,
+			   unsigned int reg, unsigned gpio, int set)
+{
+	unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val;
+
+	val = cygnus_readl(cygnus_gpio, offset);
+	if (set)
+		val |= BIT(shift);
+	else
+		val &= ~BIT(shift);
+	cygnus_writel(cygnus_gpio, offset, val);
+}
+
+static int cygnus_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+
+	return irq_find_mapping(cygnus_gpio->irq_domain, offset);
+}
+
+static void cygnus_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+	struct cygnus_gpio *cygnus_gpio;
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	int i, bit;
+
+	chained_irq_enter(chip, desc);
+
+	cygnus_gpio = irq_get_handler_data(irq);
+
+	/* go through the entire GPIO banks and handle all interrupts */
+	for (i = 0; i < cygnus_gpio->num_banks; i++) {
+		unsigned long val = cygnus_readl(cygnus_gpio,
+				(i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_MSTAT_OFFSET);
+
+		for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
+			unsigned pin = NGPIOS_PER_BANK * i + bit;
+			int child_irq =
+				cygnus_gpio_to_irq(&cygnus_gpio->gc, pin);
+
+			/*
+			 * Clear the interrupt before invoking the
+			 * handler, so we do not leave any window
+			 */
+			cygnus_writel(cygnus_gpio, (i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_CLR_OFFSET, BIT(bit));
+
+			generic_handle_irq(child_irq);
+		}
+	}
+
+	chained_irq_exit(chip, desc);
+}
+
+
+static void cygnus_gpio_irq_ack(struct irq_data *d)
+{
+	struct cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset = CYGNUS_GPIO_REG(gpio,
+			CYGNUS_GPIO_INT_CLR_OFFSET);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val = BIT(shift);
+
+	cygnus_writel(cygnus_gpio, offset, val);
+}
+
+/**
+ *  cygnus_gpio_irq_set_mask - mask/unmask a GPIO interrupt
+ *
+ *  @d: IRQ chip data
+ *  @mask: mask/unmask GPIO interrupt. 0 - mask (disable); 1 - unmask (enable)
+ */
+static void cygnus_gpio_irq_set_mask(struct irq_data *d, int mask)
+{
+	struct cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_INT_MSK_OFFSET, gpio, mask);
+}
+
+static void cygnus_gpio_irq_mask(struct irq_data *d)
+{
+	struct cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_gpio_irq_set_mask(d, 0);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static void cygnus_gpio_irq_unmask(struct irq_data *d)
+{
+	struct cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_gpio_irq_set_mask(d, 1);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static int cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+	struct cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	int int_type = 0, dual_edge = 0, edge_lvl = 0;
+	unsigned long flags;
+
+	switch (type & IRQ_TYPE_SENSE_MASK) {
+	case IRQ_TYPE_EDGE_RISING:
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_EDGE_FALLING:
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		dual_edge = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_HIGH:
+		int_type = 1;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_LOW:
+		int_type = 1;
+		break;
+
+	default:
+		dev_err(cygnus_gpio->dev, "invalid GPIO IRQ type 0x%x\n",
+				type);
+		return -EINVAL;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_IN_TYPE_OFFSET, gpio,
+			int_type);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_INT_DE_OFFSET, gpio,
+			dual_edge);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_INT_EDGE_OFFSET, gpio,
+			edge_lvl);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+		"gpio:%u set int_type:%d dual_edge:%d edge_lvl:%d\n",
+		gpio, int_type, dual_edge, edge_lvl);
+
+	return 0;
+}
+
+static struct irq_chip cygnus_gpio_irq_chip = {
+	.name = "bcm-cygnus-gpio",
+	.irq_ack = cygnus_gpio_irq_ack,
+	.irq_mask = cygnus_gpio_irq_mask,
+	.irq_unmask = cygnus_gpio_irq_unmask,
+	.irq_set_type = cygnus_gpio_irq_set_type,
+};
+
+static int cygnus_gpio_direction_input(struct gpio_chip *gc, unsigned gpio)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 0);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u set input\n", gpio);
+
+	return 0;
+}
+
+static int cygnus_gpio_direction_output(struct gpio_chip *gc,
+		unsigned gpio, int value)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 1);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u set output, value:%d\n",
+			gpio, value);
+
+	return 0;
+}
+
+static void cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio,
+		int value)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u set, value:%d\n", gpio, value);
+}
+
+static int cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+	unsigned int offset = CYGNUS_GPIO_REG(gpio,
+			CYGNUS_GPIO_DATA_IN_OFFSET);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val;
+
+	val = cygnus_readl(cygnus_gpio, offset);
+	val = (val >> shift) & 1;
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u get, value:%d\n", gpio, val);
+
+	return val;
+}
+
+static struct lock_class_key gpio_lock_class;
+
+static int cygnus_gpio_irq_map(struct irq_domain *d, unsigned int irq,
+			       irq_hw_number_t hwirq)
+{
+	int ret;
+
+	ret = irq_set_chip_data(irq, d->host_data);
+	if (ret < 0)
+		return ret;
+	irq_set_lockdep_class(irq, &gpio_lock_class);
+	irq_set_chip_and_handler(irq, &cygnus_gpio_irq_chip,
+			handle_simple_irq);
+	set_irq_flags(irq, IRQF_VALID);
+
+	return 0;
+}
+
+static void cygnus_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
+{
+	irq_set_chip_and_handler(irq, NULL, NULL);
+	irq_set_chip_data(irq, NULL);
+}
+
+static struct irq_domain_ops cygnus_irq_ops = {
+	.map = cygnus_gpio_irq_map,
+	.unmap = cygnus_gpio_irq_unmap,
+	.xlate = irq_domain_xlate_twocell,
+};
+
+#ifdef CONFIG_OF_GPIO
+static void cygnus_gpio_set_pull(struct cygnus_gpio *cygnus_gpio,
+				 unsigned gpio, enum gpio_pull pull)
+{
+	int pullup;
+	unsigned long flags;
+
+	switch (pull) {
+	case GPIO_PULL_UP:
+		pullup = 1;
+		break;
+	case GPIO_PULL_DOWN:
+		pullup = 0;
+		break;
+	case GPIO_PULL_NONE:
+	case GPIO_PULL_INVALID:
+	default:
+		return;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	/* set pull up/down */
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_PAD_RES_OFFSET, gpio, pullup);
+	/* enable pad */
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_RES_EN_OFFSET, gpio, 1);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u set pullup:%d\n", gpio, pullup);
+}
+
+static void cygnus_gpio_set_strength(struct cygnus_gpio *cygnus_gpio,
+		unsigned gpio, enum gpio_drv_strength strength)
+{
+	struct device *dev = cygnus_gpio->dev;
+	void __iomem *base;
+	unsigned int i, offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	/* some GPIO controllers do not support drive strength configuration */
+	if (of_find_property(dev->of_node, "no-drv-strength", NULL))
+		return;
+
+	/*
+	 * Some GPIO controllers use a different register block for drive
+	 * strength control
+	 */
+	if (cygnus_gpio->io_ctrl) {
+		base = cygnus_gpio->io_ctrl;
+		offset = CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET;
+	} else {
+		base = cygnus_gpio->base;
+		offset = CYGNUS_GPIO_REG(gpio,
+				CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET);
+	}
+
+	shift = CYGNUS_GPIO_SHIFT(gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
+		val = readl(base + offset);
+		val &= ~BIT(shift);
+		val |= ((strength >> i) & 0x1) << shift;
+		writel(val, base + offset);
+		offset += 4;
+	}
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+			"gpio:%u set drive strength:%d\n", gpio, strength);
+}
+
+static int cygnus_gpio_of_xlate(struct gpio_chip *gc,
+		const struct of_phandle_args *gpiospec, u32 *flags)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+	enum gpio_pull pull;
+	enum gpio_drv_strength strength;
+
+	if (gc->of_gpio_n_cells < 2)
+		return -EINVAL;
+
+	if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
+		return -EINVAL;
+
+	if (gpiospec->args[0] >= gc->ngpio)
+		return -EINVAL;
+
+	pull = (gpiospec->args[1] >> GPIO_PULL_BIT_SHIFT) & GPIO_PULL_BIT_MASK;
+	if (WARN_ON(pull >= GPIO_PULL_INVALID))
+		return -EINVAL;
+
+	strength = (gpiospec->args[1] >> GPIO_DRV_STRENGTH_BIT_SHIFT) &
+		GPIO_DRV_STRENGTH_BIT_MASK;
+
+	if (flags)
+		*flags = gpiospec->args[1] & GPIO_FLAG_BIT_MASK;
+
+	cygnus_gpio_set_pull(cygnus_gpio, gpiospec->args[0], pull);
+	cygnus_gpio_set_strength(cygnus_gpio, gpiospec->args[0], strength);
+
+	return gpiospec->args[0];
+}
+#endif
+
+static const struct of_device_id cygnus_gpio_of_match[] = {
+	{ .compatible = "brcm,cygnus-gpio" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, cygnus_gpio_of_match);
+
+static int cygnus_gpio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+	struct cygnus_gpio *cygnus_gpio;
+	struct gpio_chip *gc;
+	u32 i, ngpios;
+	int ret;
+
+	cygnus_gpio = devm_kzalloc(dev, sizeof(*cygnus_gpio), GFP_KERNEL);
+	if (!cygnus_gpio)
+		return -ENOMEM;
+
+	cygnus_gpio->dev = dev;
+	platform_set_drvdata(pdev, cygnus_gpio);
+
+	if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
+		dev_err(&pdev->dev, "missing ngpios DT property\n");
+		return -ENODEV;
+	}
+	cygnus_gpio->num_banks = (ngpios + NGPIOS_PER_BANK - 1) /
+		NGPIOS_PER_BANK;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	cygnus_gpio->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(cygnus_gpio->base)) {
+		dev_err(&pdev->dev, "unable to map I/O memory\n");
+		return PTR_ERR(cygnus_gpio->base);
+	}
+
+	/*
+	 * Only certain types of Cygnus GPIO interfaces have I/O control
+	 * registers
+	 */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (res) {
+		cygnus_gpio->io_ctrl = devm_ioremap_resource(dev, res);
+		if (IS_ERR(cygnus_gpio->io_ctrl)) {
+			dev_err(&pdev->dev, "unable to map I/O memory\n");
+			return PTR_ERR(cygnus_gpio->io_ctrl);
+		}
+	}
+
+	spin_lock_init(&cygnus_gpio->lock);
+
+	gc = &cygnus_gpio->gc;
+	gc->base = -1;
+	gc->ngpio = ngpios;
+	gc->label = dev_name(dev);
+	gc->dev = dev;
+#ifdef CONFIG_OF_GPIO
+	gc->of_node = dev->of_node;
+	gc->of_gpio_n_cells = 2;
+	gc->of_xlate = cygnus_gpio_of_xlate;
+#endif
+	gc->direction_input = cygnus_gpio_direction_input;
+	gc->direction_output = cygnus_gpio_direction_output;
+	gc->set = cygnus_gpio_set;
+	gc->get = cygnus_gpio_get;
+	gc->to_irq = cygnus_gpio_to_irq;
+
+	ret = gpiochip_add(gc);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "unable to add GPIO chip\n");
+		return ret;
+	}
+
+	/*
+	 * Some of the GPIO interfaces do not have interrupt wired to the main
+	 * processor
+	 */
+	cygnus_gpio->irq = platform_get_irq(pdev, 0);
+	if (cygnus_gpio->irq < 0) {
+		ret = cygnus_gpio->irq;
+		if (ret == -EPROBE_DEFER)
+			goto err_rm_gpiochip;
+
+		dev_info(&pdev->dev, "no interrupt hook\n");
+	}
+
+	cygnus_gpio->irq_domain = irq_domain_add_linear(dev->of_node,
+			gc->ngpio, &cygnus_irq_ops, cygnus_gpio);
+	if (!cygnus_gpio->irq_domain) {
+		dev_err(&pdev->dev, "unable to allocate IRQ domain\n");
+		ret = -ENXIO;
+		goto err_rm_gpiochip;
+	}
+
+	for (i = 0; i < gc->ngpio; i++) {
+		int irq = irq_create_mapping(cygnus_gpio->irq_domain, i);
+
+		irq_set_lockdep_class(irq, &gpio_lock_class);
+		irq_set_chip_data(irq, cygnus_gpio);
+		irq_set_chip_and_handler(irq, &cygnus_gpio_irq_chip,
+				handle_simple_irq);
+		set_irq_flags(irq, IRQF_VALID);
+	}
+
+	irq_set_chained_handler(cygnus_gpio->irq, cygnus_gpio_irq_handler);
+	irq_set_handler_data(cygnus_gpio->irq, cygnus_gpio);
+
+	return 0;
+
+err_rm_gpiochip:
+	gpiochip_remove(gc);
+	return ret;
+}
+
+static struct platform_driver cygnus_gpio_driver = {
+	.driver = {
+		.name = "bcm-cygnus-gpio",
+		.owner = THIS_MODULE,
+		.of_match_table = cygnus_gpio_of_match,
+	},
+	.probe = cygnus_gpio_probe,
+};
+
+module_platform_driver(cygnus_gpio_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus GPIO Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v6 2/3] gpio: Cygnus: add GPIO driver

[Ray Jui]

This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller, 2) the
chipCommonG GPIO controller, and 3) the ALWAYS-ON GPIO controller

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/gpio/Kconfig           |   12 +
 drivers/gpio/Makefile          |    1 +
 drivers/gpio/gpio-bcm-cygnus.c |  607 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 620 insertions(+)
 create mode 100644 drivers/gpio/gpio-bcm-cygnus.c

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 633ec21..1790ffd 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -126,6 +126,18 @@ config GPIO_74XX_MMIO
 	    8 bits:	74244 (Input), 74273 (Output)
 	    16 bits:	741624 (Input), 7416374 (Output)
 
+config GPIO_BCM_CYGNUS
+	bool "Broadcom Cygnus GPIO support"
+	depends on ARCH_BCM_CYGNUS && OF_GPIO
+	default y
+	help
+	  Say yes here to turn on GPIO support for Broadcom Cygnus SoC
+
+	  The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
+	  GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
+	  the always-ON GPIO controller (CRMU). All 3 GPIO controllers are
+	  supported by this driver
+
 config GPIO_CLPS711X
 	tristate "CLPS711X GPIO support"
 	depends on ARCH_CLPS711X || COMPILE_TEST
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 81755f1..31eb7e0 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_GPIO_ADP5520)	+= gpio-adp5520.o
 obj-$(CONFIG_GPIO_ADP5588)	+= gpio-adp5588.o
 obj-$(CONFIG_GPIO_AMD8111)	+= gpio-amd8111.o
 obj-$(CONFIG_GPIO_ARIZONA)	+= gpio-arizona.o
+obj-$(CONFIG_GPIO_BCM_CYGNUS)	+= gpio-bcm-cygnus.o
 obj-$(CONFIG_GPIO_BCM_KONA)	+= gpio-bcm-kona.o
 obj-$(CONFIG_GPIO_BT8XX)	+= gpio-bt8xx.o
 obj-$(CONFIG_GPIO_CLPS711X)	+= gpio-clps711x.o
diff --git a/drivers/gpio/gpio-bcm-cygnus.c b/drivers/gpio/gpio-bcm-cygnus.c
new file mode 100644
index 0000000..817bc9a
--- /dev/null
+++ b/drivers/gpio/gpio-bcm-cygnus.c
@@ -0,0 +1,607 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/ioport.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/irqchip/chained_irq.h>
+
+#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
+#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
+#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
+#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
+#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
+#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
+#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
+#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
+#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
+#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
+#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
+#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
+
+/* drive strength control for ASIU GPIO */
+#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
+
+/* drive strength control for CCM GPIO */
+#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00
+
+#define GPIO_BANK_SIZE 0x200
+#define NGPIOS_PER_BANK 32
+#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
+
+#define CYGNUS_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + (reg))
+#define CYGNUS_GPIO_SHIFT(pin) ((pin) % NGPIOS_PER_BANK)
+
+#define GPIO_FLAG_BIT_MASK           0xffff
+#define GPIO_PULL_BIT_SHIFT          16
+#define GPIO_PULL_BIT_MASK           0x3
+
+#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
+#define GPIO_DRV_STRENGTH_BITS       3
+#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
+
+/*
+ * For GPIO internal pull up/down registers
+ */
+enum gpio_pull {
+	GPIO_PULL_NONE = 0,
+	GPIO_PULL_UP,
+	GPIO_PULL_DOWN,
+	GPIO_PULL_INVALID,
+};
+
+/*
+ * GPIO drive strength
+ */
+enum gpio_drv_strength {
+	GPIO_DRV_STRENGTH_2MA = 0,
+	GPIO_DRV_STRENGTH_4MA,
+	GPIO_DRV_STRENGTH_6MA,
+	GPIO_DRV_STRENGTH_8MA,
+	GPIO_DRV_STRENGTH_10MA,
+	GPIO_DRV_STRENGTH_12MA,
+	GPIO_DRV_STRENGTH_14MA,
+	GPIO_DRV_STRENGTH_16MA,
+	GPIO_DRV_STRENGTH_INVALID,
+};
+
+struct cygnus_gpio {
+	struct device *dev;
+	void __iomem *base;
+	void __iomem *io_ctrl;
+	spinlock_t lock;
+	struct gpio_chip gc;
+	unsigned num_banks;
+	int irq;
+	struct irq_domain *irq_domain;
+};
+
+static struct cygnus_gpio *to_cygnus_gpio(struct gpio_chip *gc)
+{
+	return container_of(gc, struct cygnus_gpio, gc);
+}
+
+static u32 cygnus_readl(struct cygnus_gpio *cygnus_gpio, unsigned int offset)
+{
+	return readl(cygnus_gpio->base + offset);
+}
+
+static void cygnus_writel(struct cygnus_gpio *cygnus_gpio,
+			  unsigned int offset, u32 val)
+{
+	writel(val, cygnus_gpio->base + offset);
+}
+
+/**
+ *  cygnus_set_bit - set or clear one bit (corresponding to the GPIO pin) in a
+ *  Cygnus GPIO register
+ *
+ *  @cygnus_gpio: Cygnus GPIO device
+ *  @reg: register offset
+ *  @gpio: GPIO pin
+ *  @set: set or clear. 1 - set; 0 -clear
+ */
+static void cygnus_set_bit(struct cygnus_gpio *cygnus_gpio,
+			   unsigned int reg, unsigned gpio, int set)
+{
+	unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val;
+
+	val = cygnus_readl(cygnus_gpio, offset);
+	if (set)
+		val |= BIT(shift);
+	else
+		val &= ~BIT(shift);
+	cygnus_writel(cygnus_gpio, offset, val);
+}
+
+static int cygnus_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+
+	return irq_find_mapping(cygnus_gpio->irq_domain, offset);
+}
+
+static void cygnus_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+	struct cygnus_gpio *cygnus_gpio;
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	int i, bit;
+
+	chained_irq_enter(chip, desc);
+
+	cygnus_gpio = irq_get_handler_data(irq);
+
+	/* go through the entire GPIO banks and handle all interrupts */
+	for (i = 0; i < cygnus_gpio->num_banks; i++) {
+		unsigned long val = cygnus_readl(cygnus_gpio,
+				(i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_MSTAT_OFFSET);
+
+		for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
+			unsigned pin = NGPIOS_PER_BANK * i + bit;
+			int child_irq =
+				cygnus_gpio_to_irq(&cygnus_gpio->gc, pin);
+
+			/*
+			 * Clear the interrupt before invoking the
+			 * handler, so we do not leave any window
+			 */
+			cygnus_writel(cygnus_gpio, (i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_CLR_OFFSET, BIT(bit));
+
+			generic_handle_irq(child_irq);
+		}
+	}
+
+	chained_irq_exit(chip, desc);
+}
+
+
+static void cygnus_gpio_irq_ack(struct irq_data *d)
+{
+	struct cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	unsigned int offset = CYGNUS_GPIO_REG(gpio,
+			CYGNUS_GPIO_INT_CLR_OFFSET);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val = BIT(shift);
+
+	cygnus_writel(cygnus_gpio, offset, val);
+}
+
+/**
+ *  cygnus_gpio_irq_set_mask - mask/unmask a GPIO interrupt
+ *
+ *  @d: IRQ chip data
+ *  @mask: mask/unmask GPIO interrupt. 0 - mask (disable); 1 - unmask (enable)
+ */
+static void cygnus_gpio_irq_set_mask(struct irq_data *d, int mask)
+{
+	struct cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_INT_MSK_OFFSET, gpio, mask);
+}
+
+static void cygnus_gpio_irq_mask(struct irq_data *d)
+{
+	struct cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_gpio_irq_set_mask(d, 0);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static void cygnus_gpio_irq_unmask(struct irq_data *d)
+{
+	struct cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_gpio_irq_set_mask(d, 1);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+}
+
+static int cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+	struct cygnus_gpio *cygnus_gpio = irq_data_get_irq_chip_data(d);
+	unsigned gpio = d->hwirq;
+	int int_type = 0, dual_edge = 0, edge_lvl = 0;
+	unsigned long flags;
+
+	switch (type & IRQ_TYPE_SENSE_MASK) {
+	case IRQ_TYPE_EDGE_RISING:
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_EDGE_FALLING:
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		dual_edge = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_HIGH:
+		int_type = 1;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_LOW:
+		int_type = 1;
+		break;
+
+	default:
+		dev_err(cygnus_gpio->dev, "invalid GPIO IRQ type 0x%x\n",
+				type);
+		return -EINVAL;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_IN_TYPE_OFFSET, gpio,
+			int_type);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_INT_DE_OFFSET, gpio,
+			dual_edge);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_INT_EDGE_OFFSET, gpio,
+			edge_lvl);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+		"gpio:%u set int_type:%d dual_edge:%d edge_lvl:%d\n",
+		gpio, int_type, dual_edge, edge_lvl);
+
+	return 0;
+}
+
+static struct irq_chip cygnus_gpio_irq_chip = {
+	.name = "bcm-cygnus-gpio",
+	.irq_ack = cygnus_gpio_irq_ack,
+	.irq_mask = cygnus_gpio_irq_mask,
+	.irq_unmask = cygnus_gpio_irq_unmask,
+	.irq_set_type = cygnus_gpio_irq_set_type,
+};
+
+static int cygnus_gpio_direction_input(struct gpio_chip *gc, unsigned gpio)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 0);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u set input\n", gpio);
+
+	return 0;
+}
+
+static int cygnus_gpio_direction_output(struct gpio_chip *gc,
+		unsigned gpio, int value)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 1);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u set output, value:%d\n",
+			gpio, value);
+
+	return 0;
+}
+
+static void cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio,
+		int value)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u set, value:%d\n", gpio, value);
+}
+
+static int cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+	unsigned int offset = CYGNUS_GPIO_REG(gpio,
+			CYGNUS_GPIO_DATA_IN_OFFSET);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val;
+
+	val = cygnus_readl(cygnus_gpio, offset);
+	val = (val >> shift) & 1;
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u get, value:%d\n", gpio, val);
+
+	return val;
+}
+
+static struct lock_class_key gpio_lock_class;
+
+static int cygnus_gpio_irq_map(struct irq_domain *d, unsigned int irq,
+			       irq_hw_number_t hwirq)
+{
+	int ret;
+
+	ret = irq_set_chip_data(irq, d->host_data);
+	if (ret < 0)
+		return ret;
+	irq_set_lockdep_class(irq, &gpio_lock_class);
+	irq_set_chip_and_handler(irq, &cygnus_gpio_irq_chip,
+			handle_simple_irq);
+	set_irq_flags(irq, IRQF_VALID);
+
+	return 0;
+}
+
+static void cygnus_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
+{
+	irq_set_chip_and_handler(irq, NULL, NULL);
+	irq_set_chip_data(irq, NULL);
+}
+
+static struct irq_domain_ops cygnus_irq_ops = {
+	.map = cygnus_gpio_irq_map,
+	.unmap = cygnus_gpio_irq_unmap,
+	.xlate = irq_domain_xlate_twocell,
+};
+
+#ifdef CONFIG_OF_GPIO
+static void cygnus_gpio_set_pull(struct cygnus_gpio *cygnus_gpio,
+				 unsigned gpio, enum gpio_pull pull)
+{
+	int pullup;
+	unsigned long flags;
+
+	switch (pull) {
+	case GPIO_PULL_UP:
+		pullup = 1;
+		break;
+	case GPIO_PULL_DOWN:
+		pullup = 0;
+		break;
+	case GPIO_PULL_NONE:
+	case GPIO_PULL_INVALID:
+	default:
+		return;
+	}
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+	/* set pull up/down */
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_PAD_RES_OFFSET, gpio, pullup);
+	/* enable pad */
+	cygnus_set_bit(cygnus_gpio, CYGNUS_GPIO_RES_EN_OFFSET, gpio, 1);
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev, "gpio:%u set pullup:%d\n", gpio, pullup);
+}
+
+static void cygnus_gpio_set_strength(struct cygnus_gpio *cygnus_gpio,
+		unsigned gpio, enum gpio_drv_strength strength)
+{
+	struct device *dev = cygnus_gpio->dev;
+	void __iomem *base;
+	unsigned int i, offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	/* some GPIO controllers do not support drive strength configuration */
+	if (of_find_property(dev->of_node, "no-drv-strength", NULL))
+		return;
+
+	/*
+	 * Some GPIO controllers use a different register block for drive
+	 * strength control
+	 */
+	if (cygnus_gpio->io_ctrl) {
+		base = cygnus_gpio->io_ctrl;
+		offset = CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET;
+	} else {
+		base = cygnus_gpio->base;
+		offset = CYGNUS_GPIO_REG(gpio,
+				CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET);
+	}
+
+	shift = CYGNUS_GPIO_SHIFT(gpio);
+
+	spin_lock_irqsave(&cygnus_gpio->lock, flags);
+
+	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
+		val = readl(base + offset);
+		val &= ~BIT(shift);
+		val |= ((strength >> i) & 0x1) << shift;
+		writel(val, base + offset);
+		offset += 4;
+	}
+
+	spin_unlock_irqrestore(&cygnus_gpio->lock, flags);
+
+	dev_dbg(cygnus_gpio->dev,
+			"gpio:%u set drive strength:%d\n", gpio, strength);
+}
+
+static int cygnus_gpio_of_xlate(struct gpio_chip *gc,
+		const struct of_phandle_args *gpiospec, u32 *flags)
+{
+	struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
+	enum gpio_pull pull;
+	enum gpio_drv_strength strength;
+
+	if (gc->of_gpio_n_cells < 2)
+		return -EINVAL;
+
+	if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
+		return -EINVAL;
+
+	if (gpiospec->args[0] >= gc->ngpio)
+		return -EINVAL;
+
+	pull = (gpiospec->args[1] >> GPIO_PULL_BIT_SHIFT) & GPIO_PULL_BIT_MASK;
+	if (WARN_ON(pull >= GPIO_PULL_INVALID))
+		return -EINVAL;
+
+	strength = (gpiospec->args[1] >> GPIO_DRV_STRENGTH_BIT_SHIFT) &
+		GPIO_DRV_STRENGTH_BIT_MASK;
+
+	if (flags)
+		*flags = gpiospec->args[1] & GPIO_FLAG_BIT_MASK;
+
+	cygnus_gpio_set_pull(cygnus_gpio, gpiospec->args[0], pull);
+	cygnus_gpio_set_strength(cygnus_gpio, gpiospec->args[0], strength);
+
+	return gpiospec->args[0];
+}
+#endif
+
+static const struct of_device_id cygnus_gpio_of_match[] = {
+	{ .compatible = "brcm,cygnus-gpio" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, cygnus_gpio_of_match);
+
+static int cygnus_gpio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+	struct cygnus_gpio *cygnus_gpio;
+	struct gpio_chip *gc;
+	u32 i, ngpios;
+	int ret;
+
+	cygnus_gpio = devm_kzalloc(dev, sizeof(*cygnus_gpio), GFP_KERNEL);
+	if (!cygnus_gpio)
+		return -ENOMEM;
+
+	cygnus_gpio->dev = dev;
+	platform_set_drvdata(pdev, cygnus_gpio);
+
+	if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
+		dev_err(&pdev->dev, "missing ngpios DT property\n");
+		return -ENODEV;
+	}
+	cygnus_gpio->num_banks = (ngpios + NGPIOS_PER_BANK - 1) /
+		NGPIOS_PER_BANK;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	cygnus_gpio->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(cygnus_gpio->base)) {
+		dev_err(&pdev->dev, "unable to map I/O memory\n");
+		return PTR_ERR(cygnus_gpio->base);
+	}
+
+	/*
+	 * Only certain types of Cygnus GPIO interfaces have I/O control
+	 * registers
+	 */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (res) {
+		cygnus_gpio->io_ctrl = devm_ioremap_resource(dev, res);
+		if (IS_ERR(cygnus_gpio->io_ctrl)) {
+			dev_err(&pdev->dev, "unable to map I/O memory\n");
+			return PTR_ERR(cygnus_gpio->io_ctrl);
+		}
+	}
+
+	spin_lock_init(&cygnus_gpio->lock);
+
+	gc = &cygnus_gpio->gc;
+	gc->base = -1;
+	gc->ngpio = ngpios;
+	gc->label = dev_name(dev);
+	gc->dev = dev;
+#ifdef CONFIG_OF_GPIO
+	gc->of_node = dev->of_node;
+	gc->of_gpio_n_cells = 2;
+	gc->of_xlate = cygnus_gpio_of_xlate;
+#endif
+	gc->direction_input = cygnus_gpio_direction_input;
+	gc->direction_output = cygnus_gpio_direction_output;
+	gc->set = cygnus_gpio_set;
+	gc->get = cygnus_gpio_get;
+	gc->to_irq = cygnus_gpio_to_irq;
+
+	ret = gpiochip_add(gc);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "unable to add GPIO chip\n");
+		return ret;
+	}
+
+	/*
+	 * Some of the GPIO interfaces do not have interrupt wired to the main
+	 * processor
+	 */
+	cygnus_gpio->irq = platform_get_irq(pdev, 0);
+	if (cygnus_gpio->irq < 0) {
+		ret = cygnus_gpio->irq;
+		if (ret == -EPROBE_DEFER)
+			goto err_rm_gpiochip;
+
+		dev_info(&pdev->dev, "no interrupt hook\n");
+	}
+
+	cygnus_gpio->irq_domain = irq_domain_add_linear(dev->of_node,
+			gc->ngpio, &cygnus_irq_ops, cygnus_gpio);
+	if (!cygnus_gpio->irq_domain) {
+		dev_err(&pdev->dev, "unable to allocate IRQ domain\n");
+		ret = -ENXIO;
+		goto err_rm_gpiochip;
+	}
+
+	for (i = 0; i < gc->ngpio; i++) {
+		int irq = irq_create_mapping(cygnus_gpio->irq_domain, i);
+
+		irq_set_lockdep_class(irq, &gpio_lock_class);
+		irq_set_chip_data(irq, cygnus_gpio);
+		irq_set_chip_and_handler(irq, &cygnus_gpio_irq_chip,
+				handle_simple_irq);
+		set_irq_flags(irq, IRQF_VALID);
+	}
+
+	irq_set_chained_handler(cygnus_gpio->irq, cygnus_gpio_irq_handler);
+	irq_set_handler_data(cygnus_gpio->irq, cygnus_gpio);
+
+	return 0;
+
+err_rm_gpiochip:
+	gpiochip_remove(gc);
+	return ret;
+}
+
+static struct platform_driver cygnus_gpio_driver = {
+	.driver = {
+		.name = "bcm-cygnus-gpio",
+		.owner = THIS_MODULE,
+		.of_match_table = cygnus_gpio_of_match,
+	},
+	.probe = cygnus_gpio_probe,
+};
+
+module_platform_driver(cygnus_gpio_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus GPIO Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v6 3/3] ARM: dts: enable GPIO for Broadcom Cygnus

[Ray Jui]

This enables all 3 GPIO controllers including the ASIU GPIO, the
chipcommonG GPIO, and the ALWAYS-ON GPIO, for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..fbc8257 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -54,6 +54,36 @@
 
 	/include/ "bcm-cygnus-clock.dtsi"
 
+	gpio_ccm: gpio@1800a000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x1800a000 0x50>,
+			<0x0301d164 0x20>;
+		ngpios = <24>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+	};
+
+	gpio_asiu: gpio@180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio@03024800 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-drv-strength;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

[PATCH v6 3/3] ARM: dts: enable GPIO for Broadcom Cygnus

[Ray Jui]

This enables all 3 GPIO controllers including the ASIU GPIO, the
chipcommonG GPIO, and the ALWAYS-ON GPIO, for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..fbc8257 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -54,6 +54,36 @@
 
 	/include/ "bcm-cygnus-clock.dtsi"
 
+	gpio_ccm: gpio@1800a000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x1800a000 0x50>,
+			<0x0301d164 0x20>;
+		ngpios = <24>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+	};
+
+	gpio_asiu: gpio@180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio@03024800 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-drv-strength;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

[PATCH v6 3/3] ARM: dts: enable GPIO for Broadcom Cygnus

[Ray Jui]

This enables all 3 GPIO controllers including the ASIU GPIO, the
chipcommonG GPIO, and the ALWAYS-ON GPIO, for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..fbc8257 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -54,6 +54,36 @@
 
 	/include/ "bcm-cygnus-clock.dtsi"
 
+	gpio_ccm: gpio at 1800a000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x1800a000 0x50>,
+			<0x0301d164 0x20>;
+		ngpios = <24>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+	};
+
+	gpio_asiu: gpio at 180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <122>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	gpio_crmu: gpio at 03024800 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x03024800 0x50>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		no-drv-strength;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

Re: [PATCH v6 0/3] Add gpio support to Broadcom Cygnus SoC

[Arnd Bergmann]

On Monday 15 December 2014 18:18:24 Ray Jui wrote:
> This patchset contains the initial GPIO support for the Broadcom Cygnus SoC.
> Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
> and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
> the same Cygnus GPIO driver
> 
> 

Looks good to me now.

	Arnd

[PATCH v6 0/3] Add gpio support to Broadcom Cygnus SoC

[Arnd Bergmann]

On Monday 15 December 2014 18:18:24 Ray Jui wrote:
> This patchset contains the initial GPIO support for the Broadcom Cygnus SoC.
> Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
> and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
> the same Cygnus GPIO driver
> 
> 

Looks good to me now.

	Arnd

Re: [PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Alexandre Courbot]

On Sat, Dec 13, 2014 at 12:28 AM, Arnd Bergmann <arnd@arndb.de> wrote:
> On Friday 12 December 2014 22:05:37 Alexandre Courbot wrote:
>> On Fri, Dec 12, 2014 at 9:08 PM, Arnd Bergmann <arnd@arndb.de> wrote:
>> > On Thursday 11 December 2014 16:05:04 Ray Jui wrote:
>> >> +
>> >> +- linux,gpio-base:
>> >> +    Base GPIO number of this controller
>> >> +
>> >>
>> >
>> > We've NAK'ed properties like this multiple times before, and it
>> > doesn't get any better this time. What are you trying to achieve
>> > here?
>>
>> I am to blame for suggesting using this property to Ray, and I am
>> fully aware that this has been rejected before, but look at what
>> people came with recently to palliate the lack of control over the
>> GPIO number space for DT platforms:
>>
>> http://www.spinics.net/lists/arm-kernel/msg384847.html
>> https://lkml.org/lkml/2014/12/10/133
>>
>> Right now GPIO numbering for platforms using DT is a very inconsistent
>> process, subject to change by the simple action of adjusting the value
>> of ARCH_NR_GPIOS (which we did recently, btw), adding a new GPIO
>> controller, or changing the probe order of devices. For users of the
>> integer or sysfs interfaces, this results in GPIO numbers that change,
>> and drivers and/or user-space programs that behave incorrectly.
>> Ironically, the only way to have consistent numbers is to use the old
>> platform files, where you can specify the base number of a gpio_chip.
>>
>> DT is actually probably not such a bad place to provide consistency in
>> GPIO numbering. It has a global vision of the system layout, including
>> all GPIO controllers and the number of GPIOs they include, and thus
>> can make informed decisions. It provides a consistent result
>> regardless of probe order. And allowing it to assign GPIO bases to
>> controllers will free us from the nonsensical dependency of some
>> arbitrary upper-bound for GPIO numbers that ARCH_NR_GPIOS imposes on
>> us. Also about ARCH_NR_GPIOS, the plan is to eventually remove it
>> since we don't need it anymore after the removal of the global
>> gpio_descs array. This will again interfere with the numbering of GPIO
>> chips that do not have a base number provided.
>>
>> Note that I don't really like this, either - but the problem is the
>> GPIO integer interface. Until everyone has upgraded to gpiod and we
>> have a replacement for the current sysfs interface (this will take a
>> while) we have to cope with this. This issue has been bothering users
>> for years, so this time I'd like to try and solve it the less ugly
>> way. If there is a better solution, of course I'm all for it.
>
> I think the scheme will fail if you ever get gpio controllers that are
> not part of the DT: We have hotpluggable devices (PCI, USB, ...) that
> are not represented in DT and that may also provide GPIOs for internal
> uses.
>
> The current state of affairs is definitely problematic, but defining
> the GPIO numbers in DT properties would only be a relative improvement,
> not a solution, and I fear it would make it harder to change the kernel
> to remove the gpio numbers eventually.

You are absolutely right that this would be only a partial solution.
However this is a situation where there is no absolute fix (besides
dropping the GPIO numbers completely) and the relief this property
would brings makes it up for its shortcomings IMHO.

> I wonder if we could instead come up with an approach that completely
> randomizes the gpio numbers (as a compile-time option) to find any
> places that still rely on specific numbers.

A.k.a. Linus and Alex' hate mail generator. :P

Actually we are not that far from being able to do completely without
any GPIO number, and maybe that's what we should aim for. I think the
only remaining offender is the sysfs interface. If we could reach GPIO
controllers through a fixed path and just export their GPIOs there, I
believe we would have fixed the whole issue.

Re: [PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Alexandre Courbot]

On Sat, Dec 13, 2014 at 12:28 AM, Arnd Bergmann <arnd@arndb.de> wrote:
> On Friday 12 December 2014 22:05:37 Alexandre Courbot wrote:
>> On Fri, Dec 12, 2014 at 9:08 PM, Arnd Bergmann <arnd@arndb.de> wrote:
>> > On Thursday 11 December 2014 16:05:04 Ray Jui wrote:
>> >> +
>> >> +- linux,gpio-base:
>> >> +    Base GPIO number of this controller
>> >> +
>> >>
>> >
>> > We've NAK'ed properties like this multiple times before, and it
>> > doesn't get any better this time. What are you trying to achieve
>> > here?
>>
>> I am to blame for suggesting using this property to Ray, and I am
>> fully aware that this has been rejected before, but look at what
>> people came with recently to palliate the lack of control over the
>> GPIO number space for DT platforms:
>>
>> http://www.spinics.net/lists/arm-kernel/msg384847.html
>> https://lkml.org/lkml/2014/12/10/133
>>
>> Right now GPIO numbering for platforms using DT is a very inconsistent
>> process, subject to change by the simple action of adjusting the value
>> of ARCH_NR_GPIOS (which we did recently, btw), adding a new GPIO
>> controller, or changing the probe order of devices. For users of the
>> integer or sysfs interfaces, this results in GPIO numbers that change,
>> and drivers and/or user-space programs that behave incorrectly.
>> Ironically, the only way to have consistent numbers is to use the old
>> platform files, where you can specify the base number of a gpio_chip.
>>
>> DT is actually probably not such a bad place to provide consistency in
>> GPIO numbering. It has a global vision of the system layout, including
>> all GPIO controllers and the number of GPIOs they include, and thus
>> can make informed decisions. It provides a consistent result
>> regardless of probe order. And allowing it to assign GPIO bases to
>> controllers will free us from the nonsensical dependency of some
>> arbitrary upper-bound for GPIO numbers that ARCH_NR_GPIOS imposes on
>> us. Also about ARCH_NR_GPIOS, the plan is to eventually remove it
>> since we don't need it anymore after the removal of the global
>> gpio_descs array. This will again interfere with the numbering of GPIO
>> chips that do not have a base number provided.
>>
>> Note that I don't really like this, either - but the problem is the
>> GPIO integer interface. Until everyone has upgraded to gpiod and we
>> have a replacement for the current sysfs interface (this will take a
>> while) we have to cope with this. This issue has been bothering users
>> for years, so this time I'd like to try and solve it the less ugly
>> way. If there is a better solution, of course I'm all for it.
>
> I think the scheme will fail if you ever get gpio controllers that are
> not part of the DT: We have hotpluggable devices (PCI, USB, ...) that
> are not represented in DT and that may also provide GPIOs for internal
> uses.
>
> The current state of affairs is definitely problematic, but defining
> the GPIO numbers in DT properties would only be a relative improvement,
> not a solution, and I fear it would make it harder to change the kernel
> to remove the gpio numbers eventually.

You are absolutely right that this would be only a partial solution.
However this is a situation where there is no absolute fix (besides
dropping the GPIO numbers completely) and the relief this property
would brings makes it up for its shortcomings IMHO.

> I wonder if we could instead come up with an approach that completely
> randomizes the gpio numbers (as a compile-time option) to find any
> places that still rely on specific numbers.

A.k.a. Linus and Alex' hate mail generator. :P

Actually we are not that far from being able to do completely without
any GPIO number, and maybe that's what we should aim for. I think the
only remaining offender is the sysfs interface. If we could reach GPIO
controllers through a fixed path and just export their GPIOs there, I
believe we would have fixed the whole issue.

[PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Alexandre Courbot]

On Sat, Dec 13, 2014 at 12:28 AM, Arnd Bergmann <arnd@arndb.de> wrote:
> On Friday 12 December 2014 22:05:37 Alexandre Courbot wrote:
>> On Fri, Dec 12, 2014 at 9:08 PM, Arnd Bergmann <arnd@arndb.de> wrote:
>> > On Thursday 11 December 2014 16:05:04 Ray Jui wrote:
>> >> +
>> >> +- linux,gpio-base:
>> >> +    Base GPIO number of this controller
>> >> +
>> >>
>> >
>> > We've NAK'ed properties like this multiple times before, and it
>> > doesn't get any better this time. What are you trying to achieve
>> > here?
>>
>> I am to blame for suggesting using this property to Ray, and I am
>> fully aware that this has been rejected before, but look at what
>> people came with recently to palliate the lack of control over the
>> GPIO number space for DT platforms:
>>
>> http://www.spinics.net/lists/arm-kernel/msg384847.html
>> https://lkml.org/lkml/2014/12/10/133
>>
>> Right now GPIO numbering for platforms using DT is a very inconsistent
>> process, subject to change by the simple action of adjusting the value
>> of ARCH_NR_GPIOS (which we did recently, btw), adding a new GPIO
>> controller, or changing the probe order of devices. For users of the
>> integer or sysfs interfaces, this results in GPIO numbers that change,
>> and drivers and/or user-space programs that behave incorrectly.
>> Ironically, the only way to have consistent numbers is to use the old
>> platform files, where you can specify the base number of a gpio_chip.
>>
>> DT is actually probably not such a bad place to provide consistency in
>> GPIO numbering. It has a global vision of the system layout, including
>> all GPIO controllers and the number of GPIOs they include, and thus
>> can make informed decisions. It provides a consistent result
>> regardless of probe order. And allowing it to assign GPIO bases to
>> controllers will free us from the nonsensical dependency of some
>> arbitrary upper-bound for GPIO numbers that ARCH_NR_GPIOS imposes on
>> us. Also about ARCH_NR_GPIOS, the plan is to eventually remove it
>> since we don't need it anymore after the removal of the global
>> gpio_descs array. This will again interfere with the numbering of GPIO
>> chips that do not have a base number provided.
>>
>> Note that I don't really like this, either - but the problem is the
>> GPIO integer interface. Until everyone has upgraded to gpiod and we
>> have a replacement for the current sysfs interface (this will take a
>> while) we have to cope with this. This issue has been bothering users
>> for years, so this time I'd like to try and solve it the less ugly
>> way. If there is a better solution, of course I'm all for it.
>
> I think the scheme will fail if you ever get gpio controllers that are
> not part of the DT: We have hotpluggable devices (PCI, USB, ...) that
> are not represented in DT and that may also provide GPIOs for internal
> uses.
>
> The current state of affairs is definitely problematic, but defining
> the GPIO numbers in DT properties would only be a relative improvement,
> not a solution, and I fear it would make it harder to change the kernel
> to remove the gpio numbers eventually.

You are absolutely right that this would be only a partial solution.
However this is a situation where there is no absolute fix (besides
dropping the GPIO numbers completely) and the relief this property
would brings makes it up for its shortcomings IMHO.

> I wonder if we could instead come up with an approach that completely
> randomizes the gpio numbers (as a compile-time option) to find any
> places that still rely on specific numbers.

A.k.a. Linus and Alex' hate mail generator. :P

Actually we are not that far from being able to do completely without
any GPIO number, and maybe that's what we should aim for. I think the
only remaining offender is the sysfs interface. If we could reach GPIO
controllers through a fixed path and just export their GPIOs there, I
believe we would have fixed the whole issue.

Re: [PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Alexandre Courbot]

On Tue, Dec 16, 2014 at 6:57 AM, Arnd Bergmann <arnd@arndb.de> wrote:
> On Monday 15 December 2014 13:35:47 Ray Jui wrote:
>>
>> Like I said previously, dynamic GPIO allocation works fine in the
>> kernel, as long as all of our GPIO clients in the kernel use gpiod based
>> API, which is what we will enforce going forward. The only problem is
>> with some of our customers who use GPIO through sysfs and expect fixed
>> global GPIO numbers. Thinking about this more, it's probably not that
>> difficult to add a script for those customers to convert/map the GPIO
>> numbers based on readings parsed from sysfs, so I guess that's fine.
>>
>
> I think we discussed the user space interface a number of times
> in the past, but I forgot the outcome. Either there is already
> a way to name gpio lines uniquely in sysfs, or there should be
> one.
>
> Can you reach the gpio interfaces using /sys/devices/0001234.bus/1234566.gpiocontroller/...?

No, but it seems like this is exactly the solution we need. We could
have an "export" node there that takes a relative GPIO number and
exports it under
/sys/devices/0001234.bus/1234566.gpiocontroller/exported/ the same way
the current sysfs exporter does. Then for convenience we could also
allow exported GPIOs to take names to be used under the shorter
/sys/class/gpio/ (named GPIOs is another request we pushed back many
times but that keeps coming).

Let's see if I can come with a patch. That would at least give us
something to reply to the many people that hit this issue.

Re: [PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Alexandre Courbot]

On Tue, Dec 16, 2014 at 6:57 AM, Arnd Bergmann <arnd@arndb.de> wrote:
> On Monday 15 December 2014 13:35:47 Ray Jui wrote:
>>
>> Like I said previously, dynamic GPIO allocation works fine in the
>> kernel, as long as all of our GPIO clients in the kernel use gpiod based
>> API, which is what we will enforce going forward. The only problem is
>> with some of our customers who use GPIO through sysfs and expect fixed
>> global GPIO numbers. Thinking about this more, it's probably not that
>> difficult to add a script for those customers to convert/map the GPIO
>> numbers based on readings parsed from sysfs, so I guess that's fine.
>>
>
> I think we discussed the user space interface a number of times
> in the past, but I forgot the outcome. Either there is already
> a way to name gpio lines uniquely in sysfs, or there should be
> one.
>
> Can you reach the gpio interfaces using /sys/devices/0001234.bus/1234566.gpiocontroller/...?

No, but it seems like this is exactly the solution we need. We could
have an "export" node there that takes a relative GPIO number and
exports it under
/sys/devices/0001234.bus/1234566.gpiocontroller/exported/ the same way
the current sysfs exporter does. Then for convenience we could also
allow exported GPIOs to take names to be used under the shorter
/sys/class/gpio/ (named GPIOs is another request we pushed back many
times but that keeps coming).

Let's see if I can come with a patch. That would at least give us
something to reply to the many people that hit this issue.

[PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Alexandre Courbot]

On Tue, Dec 16, 2014 at 6:57 AM, Arnd Bergmann <arnd@arndb.de> wrote:
> On Monday 15 December 2014 13:35:47 Ray Jui wrote:
>>
>> Like I said previously, dynamic GPIO allocation works fine in the
>> kernel, as long as all of our GPIO clients in the kernel use gpiod based
>> API, which is what we will enforce going forward. The only problem is
>> with some of our customers who use GPIO through sysfs and expect fixed
>> global GPIO numbers. Thinking about this more, it's probably not that
>> difficult to add a script for those customers to convert/map the GPIO
>> numbers based on readings parsed from sysfs, so I guess that's fine.
>>
>
> I think we discussed the user space interface a number of times
> in the past, but I forgot the outcome. Either there is already
> a way to name gpio lines uniquely in sysfs, or there should be
> one.
>
> Can you reach the gpio interfaces using /sys/devices/0001234.bus/1234566.gpiocontroller/...?

No, but it seems like this is exactly the solution we need. We could
have an "export" node there that takes a relative GPIO number and
exports it under
/sys/devices/0001234.bus/1234566.gpiocontroller/exported/ the same way
the current sysfs exporter does. Then for convenience we could also
allow exported GPIOs to take names to be used under the shorter
/sys/class/gpio/ (named GPIOs is another request we pushed back many
times but that keeps coming).

Let's see if I can come with a patch. That would at least give us
something to reply to the many people that hit this issue.

Re: [PATCH v6 0/3] Add gpio support to Broadcom Cygnus SoC

[Alexandre Courbot]

On Tue, Dec 16, 2014 at 11:18 AM, Ray Jui <rjui@broadcom.com> wrote:
> This patchset contains the initial GPIO support for the Broadcom Cygnus SoC.
> Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
> and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
> the same Cygnus GPIO driver

No objections for this v6. The series,

Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>

Re: [PATCH v6 0/3] Add gpio support to Broadcom Cygnus SoC

[Alexandre Courbot]

On Tue, Dec 16, 2014 at 11:18 AM, Ray Jui <rjui@broadcom.com> wrote:
> This patchset contains the initial GPIO support for the Broadcom Cygnus SoC.
> Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
> and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
> the same Cygnus GPIO driver

No objections for this v6. The series,

Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>

[PATCH v6 0/3] Add gpio support to Broadcom Cygnus SoC

[Alexandre Courbot]

On Tue, Dec 16, 2014 at 11:18 AM, Ray Jui <rjui@broadcom.com> wrote:
> This patchset contains the initial GPIO support for the Broadcom Cygnus SoC.
> Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
> and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
> the same Cygnus GPIO driver

No objections for this v6. The series,

Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>

Re: [PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Arnd Bergmann]

On Wednesday 17 December 2014 11:45:01 Alexandre Courbot wrote:
> 
> Actually we are not that far from being able to do completely without
> any GPIO number, and maybe that's what we should aim for. I think the
> only remaining offender is the sysfs interface. If we could reach GPIO
> controllers through a fixed path and just export their GPIOs there, I
> believe we would have fixed the whole issue.

What about the hundreds of board files and device drivers that still
reference hardcoded gpio numbers? The problem seems mostly solved for
anything that uses DT, but there are some architectures and a number
of ARM platforms that don't use DT and probably never will.

I would assume they could all be changed to use gpiod_lookup tables,
but that's a lot of work.

	Arnd

Re: [PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Arnd Bergmann]

On Wednesday 17 December 2014 11:45:01 Alexandre Courbot wrote:
> 
> Actually we are not that far from being able to do completely without
> any GPIO number, and maybe that's what we should aim for. I think the
> only remaining offender is the sysfs interface. If we could reach GPIO
> controllers through a fixed path and just export their GPIOs there, I
> believe we would have fixed the whole issue.

What about the hundreds of board files and device drivers that still
reference hardcoded gpio numbers? The problem seems mostly solved for
anything that uses DT, but there are some architectures and a number
of ARM platforms that don't use DT and probably never will.

I would assume they could all be changed to use gpiod_lookup tables,
but that's a lot of work.

	Arnd

[PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Arnd Bergmann]

On Wednesday 17 December 2014 11:45:01 Alexandre Courbot wrote:
> 
> Actually we are not that far from being able to do completely without
> any GPIO number, and maybe that's what we should aim for. I think the
> only remaining offender is the sysfs interface. If we could reach GPIO
> controllers through a fixed path and just export their GPIOs there, I
> believe we would have fixed the whole issue.

What about the hundreds of board files and device drivers that still
reference hardcoded gpio numbers? The problem seems mostly solved for
anything that uses DT, but there are some architectures and a number
of ARM platforms that don't use DT and probably never will.

I would assume they could all be changed to use gpiod_lookup tables,
but that's a lot of work.

	Arnd

Re: [PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Russell King - ARM Linux]

On Wed, Dec 17, 2014 at 11:45:01AM +0900, Alexandre Courbot wrote:
> Actually we are not that far from being able to do completely without
> any GPIO number, and maybe that's what we should aim for. I think the
> only remaining offender is the sysfs interface.

And that is a user API, and there's lots of users of it (eg, on Raspberry
Pi platforms.)  So changing it isn't going to be easy - I'd say that it's
impractical.

What you're suggesting would be like re-numbering Linux syscalls.

-- 
FTTC broadband for 0.8mile line: currently at 9.5Mbps down 400kbps up
according to speedtest.net.

Re: [PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Russell King - ARM Linux]

On Wed, Dec 17, 2014 at 11:45:01AM +0900, Alexandre Courbot wrote:
> Actually we are not that far from being able to do completely without
> any GPIO number, and maybe that's what we should aim for. I think the
> only remaining offender is the sysfs interface.

And that is a user API, and there's lots of users of it (eg, on Raspberry
Pi platforms.)  So changing it isn't going to be easy - I'd say that it's
impractical.

What you're suggesting would be like re-numbering Linux syscalls.

-- 
FTTC broadband for 0.8mile line: currently at 9.5Mbps down 400kbps up
according to speedtest.net.

[PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Russell King - ARM Linux]

On Wed, Dec 17, 2014 at 11:45:01AM +0900, Alexandre Courbot wrote:
> Actually we are not that far from being able to do completely without
> any GPIO number, and maybe that's what we should aim for. I think the
> only remaining offender is the sysfs interface.

And that is a user API, and there's lots of users of it (eg, on Raspberry
Pi platforms.)  So changing it isn't going to be easy - I'd say that it's
impractical.

What you're suggesting would be like re-numbering Linux syscalls.

-- 
FTTC broadband for 0.8mile line: currently at 9.5Mbps down 400kbps up
according to speedtest.net.

Re: [PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Alexandre Courbot]

On Wed, Dec 17, 2014 at 7:44 PM, Russell King - ARM Linux
<linux@arm.linux.org.uk> wrote:
> On Wed, Dec 17, 2014 at 11:45:01AM +0900, Alexandre Courbot wrote:
>> Actually we are not that far from being able to do completely without
>> any GPIO number, and maybe that's what we should aim for. I think the
>> only remaining offender is the sysfs interface.
>
> And that is a user API, and there's lots of users of it (eg, on Raspberry
> Pi platforms.)  So changing it isn't going to be easy - I'd say that it's
> impractical.
>
> What you're suggesting would be like re-numbering Linux syscalls.

Uh, I expressed myself poorly. What I intended to say is that once we
have a sysfs alternative that does not rely on GPIO numbers (and thus
have the same feature coverage as the integer interface), we can
require new platforms to exclusively rely on gpiod/sysfs2, and
encourage older users to switch to it if they have an issue with the
way integers are handled or need one of the new features.

I don't foresee that we will ever be able to retire the integer
interface, however I would like to be able to say "your problem will
be solved if you switch to gpiod" instead of having to juggle with
potentially conflicting integer range requirements from different
platforms. Right now the only thing that prevents us to say that is
the lack of a consistent sysfs interface.

Re: [PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Alexandre Courbot]

On Wed, Dec 17, 2014 at 7:44 PM, Russell King - ARM Linux
<linux@arm.linux.org.uk> wrote:
> On Wed, Dec 17, 2014 at 11:45:01AM +0900, Alexandre Courbot wrote:
>> Actually we are not that far from being able to do completely without
>> any GPIO number, and maybe that's what we should aim for. I think the
>> only remaining offender is the sysfs interface.
>
> And that is a user API, and there's lots of users of it (eg, on Raspberry
> Pi platforms.)  So changing it isn't going to be easy - I'd say that it's
> impractical.
>
> What you're suggesting would be like re-numbering Linux syscalls.

Uh, I expressed myself poorly. What I intended to say is that once we
have a sysfs alternative that does not rely on GPIO numbers (and thus
have the same feature coverage as the integer interface), we can
require new platforms to exclusively rely on gpiod/sysfs2, and
encourage older users to switch to it if they have an issue with the
way integers are handled or need one of the new features.

I don't foresee that we will ever be able to retire the integer
interface, however I would like to be able to say "your problem will
be solved if you switch to gpiod" instead of having to juggle with
potentially conflicting integer range requirements from different
platforms. Right now the only thing that prevents us to say that is
the lack of a consistent sysfs interface.

[PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Alexandre Courbot]

On Wed, Dec 17, 2014 at 7:44 PM, Russell King - ARM Linux
<linux@arm.linux.org.uk> wrote:
> On Wed, Dec 17, 2014 at 11:45:01AM +0900, Alexandre Courbot wrote:
>> Actually we are not that far from being able to do completely without
>> any GPIO number, and maybe that's what we should aim for. I think the
>> only remaining offender is the sysfs interface.
>
> And that is a user API, and there's lots of users of it (eg, on Raspberry
> Pi platforms.)  So changing it isn't going to be easy - I'd say that it's
> impractical.
>
> What you're suggesting would be like re-numbering Linux syscalls.

Uh, I expressed myself poorly. What I intended to say is that once we
have a sysfs alternative that does not rely on GPIO numbers (and thus
have the same feature coverage as the integer interface), we can
require new platforms to exclusively rely on gpiod/sysfs2, and
encourage older users to switch to it if they have an issue with the
way integers are handled or need one of the new features.

I don't foresee that we will ever be able to retire the integer
interface, however I would like to be able to say "your problem will
be solved if you switch to gpiod" instead of having to juggle with
potentially conflicting integer range requirements from different
platforms. Right now the only thing that prevents us to say that is
the lack of a consistent sysfs interface.

Re: [PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Alexandre Courbot]

On Wed, Dec 17, 2014 at 7:26 PM, Arnd Bergmann <arnd@arndb.de> wrote:
> On Wednesday 17 December 2014 11:45:01 Alexandre Courbot wrote:
>>
>> Actually we are not that far from being able to do completely without
>> any GPIO number, and maybe that's what we should aim for. I think the
>> only remaining offender is the sysfs interface. If we could reach GPIO
>> controllers through a fixed path and just export their GPIOs there, I
>> believe we would have fixed the whole issue.
>
> What about the hundreds of board files and device drivers that still
> reference hardcoded gpio numbers? The problem seems mostly solved for
> anything that uses DT, but there are some architectures and a number
> of ARM platforms that don't use DT and probably never will.
>
> I would assume they could all be changed to use gpiod_lookup tables,
> but that's a lot of work.

Indeed, that's not something to expect, as I replied to Russell. Sorry
about the confusion.

Re: [PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Alexandre Courbot]

On Wed, Dec 17, 2014 at 7:26 PM, Arnd Bergmann <arnd@arndb.de> wrote:
> On Wednesday 17 December 2014 11:45:01 Alexandre Courbot wrote:
>>
>> Actually we are not that far from being able to do completely without
>> any GPIO number, and maybe that's what we should aim for. I think the
>> only remaining offender is the sysfs interface. If we could reach GPIO
>> controllers through a fixed path and just export their GPIOs there, I
>> believe we would have fixed the whole issue.
>
> What about the hundreds of board files and device drivers that still
> reference hardcoded gpio numbers? The problem seems mostly solved for
> anything that uses DT, but there are some architectures and a number
> of ARM platforms that don't use DT and probably never will.
>
> I would assume they could all be changed to use gpiod_lookup tables,
> but that's a lot of work.

Indeed, that's not something to expect, as I replied to Russell. Sorry
about the confusion.

[PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Alexandre Courbot]

On Wed, Dec 17, 2014 at 7:26 PM, Arnd Bergmann <arnd@arndb.de> wrote:
> On Wednesday 17 December 2014 11:45:01 Alexandre Courbot wrote:
>>
>> Actually we are not that far from being able to do completely without
>> any GPIO number, and maybe that's what we should aim for. I think the
>> only remaining offender is the sysfs interface. If we could reach GPIO
>> controllers through a fixed path and just export their GPIOs there, I
>> believe we would have fixed the whole issue.
>
> What about the hundreds of board files and device drivers that still
> reference hardcoded gpio numbers? The problem seems mostly solved for
> anything that uses DT, but there are some architectures and a number
> of ARM platforms that don't use DT and probably never will.
>
> I would assume they could all be changed to use gpiod_lookup tables,
> but that's a lot of work.

Indeed, that's not something to expect, as I replied to Russell. Sorry
about the confusion.

[PATCH v2 0/5] Add common clock support for Broadcom iProc architecture

[Ray Jui]

This patchset contains the initial common clock support for Broadcom's iProc
family of SoCs. The iProc clock architecture comprises of various PLLs, e.g.,
ARMPLL, GENPLL, LCPLL0, MIPIPLL, and etc. An onboard crystal serves as the
basic reference clock for these PLLs. Each PLL may have several leaf clocks.
One special group of clocks is the ASIU clocks, which are dervied directly
from the crystal reference clock.

This patchset also contains the basic clock support for the Broadcom Cygnus
SoC, which implements the iProc clock architecture

Changes from v1:
 - Separate drivers/clk/Makefile change for drivers/clk/bcm out to a standalone patch

Ray Jui (5):
  clk: iproc: define Broadcom iProc clock binding
  clk: iproc: add initial common clock support
  clk: Change bcm clocks build dependency
  clk: cygnus: add clock support for Broadcom Cygnus
  ARM: dts: enable clock support for Broadcom Cygnus

 arch/arm/boot/dts/bcm-cygnus-clock.dtsi |  110 +++++--
 arch/arm/boot/dts/bcm-cygnus.dtsi       |    2 +-
 brcm,iproc-clocks.txt                   |  178 ++++++++++++
 drivers/clk/Makefile                    |    2 +-
 drivers/clk/bcm/Kconfig                 |    9 +
 drivers/clk/bcm/Makefile                |    2 +
 drivers/clk/bcm/clk-cygnus.c            |  277 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-armpll.c      |  286 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-asiu.c        |  275 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-clk.c         |  238 +++++++++++++++
 drivers/clk/bcm/clk-iproc-pll.c         |  483 +++++++++++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc.h             |  155 ++++++++++
 include/dt-bindings/clock/bcm-cygnus.h  |   77 +++++
 13 files changed, 2067 insertions(+), 27 deletions(-)
 create mode 100644 brcm,iproc-clocks.txt
 create mode 100644 drivers/clk/bcm/clk-cygnus.c
 create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
 create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
 create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
 create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
 create mode 100644 drivers/clk/bcm/clk-iproc.h
 create mode 100644 include/dt-bindings/clock/bcm-cygnus.h

-- 
1.7.9.5

[PATCH v2 0/5] Add common clock support for Broadcom iProc architecture

[Ray Jui]

This patchset contains the initial common clock support for Broadcom's iProc
family of SoCs. The iProc clock architecture comprises of various PLLs, e.g.,
ARMPLL, GENPLL, LCPLL0, MIPIPLL, and etc. An onboard crystal serves as the
basic reference clock for these PLLs. Each PLL may have several leaf clocks.
One special group of clocks is the ASIU clocks, which are dervied directly
from the crystal reference clock.

This patchset also contains the basic clock support for the Broadcom Cygnus
SoC, which implements the iProc clock architecture

Changes from v1:
 - Separate drivers/clk/Makefile change for drivers/clk/bcm out to a standalone patch

Ray Jui (5):
  clk: iproc: define Broadcom iProc clock binding
  clk: iproc: add initial common clock support
  clk: Change bcm clocks build dependency
  clk: cygnus: add clock support for Broadcom Cygnus
  ARM: dts: enable clock support for Broadcom Cygnus

 arch/arm/boot/dts/bcm-cygnus-clock.dtsi |  110 +++++--
 arch/arm/boot/dts/bcm-cygnus.dtsi       |    2 +-
 brcm,iproc-clocks.txt                   |  178 ++++++++++++
 drivers/clk/Makefile                    |    2 +-
 drivers/clk/bcm/Kconfig                 |    9 +
 drivers/clk/bcm/Makefile                |    2 +
 drivers/clk/bcm/clk-cygnus.c            |  277 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-armpll.c      |  286 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-asiu.c        |  275 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-clk.c         |  238 +++++++++++++++
 drivers/clk/bcm/clk-iproc-pll.c         |  483 +++++++++++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc.h             |  155 ++++++++++
 include/dt-bindings/clock/bcm-cygnus.h  |   77 +++++
 13 files changed, 2067 insertions(+), 27 deletions(-)
 create mode 100644 brcm,iproc-clocks.txt
 create mode 100644 drivers/clk/bcm/clk-cygnus.c
 create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
 create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
 create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
 create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
 create mode 100644 drivers/clk/bcm/clk-iproc.h
 create mode 100644 include/dt-bindings/clock/bcm-cygnus.h

-- 
1.7.9.5

[PATCH v2 0/5] Add common clock support for Broadcom iProc architecture

[Ray Jui]

This patchset contains the initial common clock support for Broadcom's iProc
family of SoCs. The iProc clock architecture comprises of various PLLs, e.g.,
ARMPLL, GENPLL, LCPLL0, MIPIPLL, and etc. An onboard crystal serves as the
basic reference clock for these PLLs. Each PLL may have several leaf clocks.
One special group of clocks is the ASIU clocks, which are dervied directly
from the crystal reference clock.

This patchset also contains the basic clock support for the Broadcom Cygnus
SoC, which implements the iProc clock architecture

Changes from v1:
 - Separate drivers/clk/Makefile change for drivers/clk/bcm out to a standalone patch

Ray Jui (5):
  clk: iproc: define Broadcom iProc clock binding
  clk: iproc: add initial common clock support
  clk: Change bcm clocks build dependency
  clk: cygnus: add clock support for Broadcom Cygnus
  ARM: dts: enable clock support for Broadcom Cygnus

 arch/arm/boot/dts/bcm-cygnus-clock.dtsi |  110 +++++--
 arch/arm/boot/dts/bcm-cygnus.dtsi       |    2 +-
 brcm,iproc-clocks.txt                   |  178 ++++++++++++
 drivers/clk/Makefile                    |    2 +-
 drivers/clk/bcm/Kconfig                 |    9 +
 drivers/clk/bcm/Makefile                |    2 +
 drivers/clk/bcm/clk-cygnus.c            |  277 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-armpll.c      |  286 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-asiu.c        |  275 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-clk.c         |  238 +++++++++++++++
 drivers/clk/bcm/clk-iproc-pll.c         |  483 +++++++++++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc.h             |  155 ++++++++++
 include/dt-bindings/clock/bcm-cygnus.h  |   77 +++++
 13 files changed, 2067 insertions(+), 27 deletions(-)
 create mode 100644 brcm,iproc-clocks.txt
 create mode 100644 drivers/clk/bcm/clk-cygnus.c
 create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
 create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
 create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
 create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
 create mode 100644 drivers/clk/bcm/clk-iproc.h
 create mode 100644 include/dt-bindings/clock/bcm-cygnus.h

-- 
1.7.9.5

[PATCH v2 1/5] clk: iproc: define Broadcom iProc clock binding

[Ray Jui]

Document the device tree binding for Broadcom iProc architecture based
clock controller

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 brcm,iproc-clocks.txt |  178 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 178 insertions(+)
 create mode 100644 brcm,iproc-clocks.txt

diff --git a/brcm,iproc-clocks.txt b/brcm,iproc-clocks.txt
new file mode 100644
index 0000000..cc64fd2
--- /dev/null
+++ b/brcm,iproc-clocks.txt
@@ -0,0 +1,178 @@
+Broadcom iProc Family Clocks
+
+This binding uses the common clock binding:
+    Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+The iProc clock controller manages clocks that are common to the iProc family.
+An SoC from the iProc family may have several PPLs, e.g., ARMPLL, GENPLL,
+LCPLL0, MIPIPLL, and etc., all derived from an onboard crystal. Each PLL
+comprises of several leaf clocks
+
+Required properties for PLLs:
+- compatible:
+    Should have a value of the form "brcm,<soc>-<pll>". For example, GENPLL on
+Cygnus has a compatible string of "brcm,cygnus-genpll"
+
+- #clock-cells:
+    Must be <0>
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL
+
+- clocks:
+    The input parent clock phandle for the PLL. For all iProc PLLs, this is an
+onboard crystal with a fixed rate
+
+Optional Properties for PLLs:
+- clock-frequency:
+    PLL frequency in Hz. If specified, PLL will be configured to run at
+<clock-frequency> instead of the default frequency after chip reset, provided
+that <clock-frequency> and its parameters are defined in the SoC specific
+frequency parameter table
+
+Example:
+
+	osc: oscillator {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <25000000>;
+	};
+
+	genpll: genpll {
+		#clock-cells = <0>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
+	};
+
+Required properties for leaf clocks of a PLL:
+
+- compatible:
+    Should have a value of the form "brcm,<soc>-<pll>-clk". For example, leaf
+clocks derived from the GENPLL on Cygnus SoC have a compatible string of
+"brcm,cygnus-genpll-clk"
+
+- #clock-cells:
+    Have a value of <1> since there are more than 1 leaf clock of a
+given PLL
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL leaf clocks
+
+- clocks:
+    The input parent PLL phandle for the leaf clock
+
+- clock-output-names:
+    An ordered list of strings defining the names of the leaf clocks
+
+Example:
+
+	genpll: genpll {
+		#clock-cells = <0>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
+	};
+
+	genpll_clks: genpll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-genpll-clk";
+		reg = <0x0301d000 0x2c>;
+		clocks = <&genpll>;
+		clock-output-names = "axi21", "250mhz", "ihost_sys",
+			"enet_sw", "audio_125", "can";
+	};
+
+Required properties for ASIU clocks:
+
+ASIU clocks are a special case. These clocks are derived directly from the
+reference clock of the onboard crystal
+
+- compatible:
+    Should have a value of the form "brcm,<soc>-asiu-clk". For example, ASIU
+clocks for Cygnus have a compatible string of "brcm,cygnus-asiu-clk"
+
+- #clock-cells:
+    Have a value of <1> since there are more than 1 ASIU clocks
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for ASIU clocks
+
+- clocks:
+    The input parent clock phandle for the ASIU clock, i.e., the onboard
+crystal
+
+- clock-output-names:
+    An ordered list of strings defining the names of the ASIU clocks
+
+Example:
+
+	osc: oscillator {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <25000000>;
+	};
+
+	asiu_clks: asiu_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-asiu-clk";
+		reg = <0x0301d048 0xc>,
+			<0x180aa024 0x4>;
+		clocks = <&osc>;
+		clock-output-names = "keypad", "adc/touch", "pwm";
+	};
+
+Cygnus
+------
+PLL and leaf clock compatible strings for Cygnus are:
+    "brcm,cygnus-armpll"
+    "brcm,cygnus-genpll"
+    "brcm,cygnus-lcpll0"
+    "brcm,cygnus-mipipll"
+    "brcm,cygnus-genpll-clk"
+    "brcm,cygnus-lcpll0-clk"
+    "brcm,cygnus-mipipll-clk"
+    "brcm,cygnus-asiu-clk"
+
+The following table defines the set of PLL/clock index and ID for Cygnus.
+These clock IDs are defined in:
+    "include/dt-bindings/clock/bcm-cygnus.h"
+
+    Clock      Source           Index   ID
+    ---        -----            -----   ---------
+    crystal    N/A              N/A     N/A
+
+    armpll     crystal          N/A     N/A
+    genpll     crystal          N/A     N/A
+    lcpll0     crystal          N/A     N/A
+    mipipll    crystal          N/A     N/A
+
+    keypad     crystal (ASIU)   0       BCM_CYGNUS_ASIU_KEYPAD_CLK
+    adc/tsc    crystal (ASIU)   1       BCM_CYGNUS_ASIU_ADC_CLK
+    pwm        crystal (ASIU)   2       BCM_CYGNUS_ASIU_PWM_CLK
+
+    axi21      genpll           0       BCM_CYGNUS_GENPLL_AXI21_CLK
+    250mhz     genpll           1       BCM_CYGNUS_GENPLL_250MHZ_CLK
+    ihost_sys  genpll           2       BCM_CYGNUS_GENPLL_IHOST_SYS_CLK
+    enet_sw    genpll           3       BCM_CYGNUS_GENPLL_ENET_SW_CLK
+    audio_125  genpll           4       BCM_CYGNUS_GENPLL_AUDIO_125_CLK
+    can        genpll           5       BCM_CYGNUS_GENPLL_CAN_CLK
+
+    pcie_phy   lcpll0           0       BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK
+    ddr_phy    lcpll0           1       BCM_CYGNUS_LCPLL0_DDR_PHY_CLK
+    sdio       lcpll0           2       BCM_CYGNUS_LCPLL0_SDIO_CLK
+    usb_phy    lcpll0           3       BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK
+    smart_card lcpll0           4       BCM_CYGNUS_LCPLL0_SMART_CARD_CLK
+    ch5        lcpll0           5       BCM_CYGNUS_LCPLL0_CH5_UNUSED
+
+    ch0_unused mipipll          0       BCM_CYGNUS_MIPIPLL_CH0_UNUSED
+    ch1_lcd    mipipll          1       BCM_CYGNUS_MIPIPLL_CH1_LCD
+    ch2_unused mipipll          2       BCM_CYGNUS_MIPIPLL_CH2_UNUSED
+    ch3_unused mipipll          3       BCM_CYGNUS_MIPIPLL_CH3_UNUSED
+    ch4_unused mipipll          4       BCM_CYGNUS_MIPIPLL_CH4_UNUSED
+    ch5_unused mipipll          5       BCM_CYGNUS_MIPIPLL_CH5_UNUSED
-- 
1.7.9.5

[PATCH v2 1/5] clk: iproc: define Broadcom iProc clock binding

[Ray Jui]

Document the device tree binding for Broadcom iProc architecture based
clock controller

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 brcm,iproc-clocks.txt |  178 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 178 insertions(+)
 create mode 100644 brcm,iproc-clocks.txt

diff --git a/brcm,iproc-clocks.txt b/brcm,iproc-clocks.txt
new file mode 100644
index 0000000..cc64fd2
--- /dev/null
+++ b/brcm,iproc-clocks.txt
@@ -0,0 +1,178 @@
+Broadcom iProc Family Clocks
+
+This binding uses the common clock binding:
+    Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+The iProc clock controller manages clocks that are common to the iProc family.
+An SoC from the iProc family may have several PPLs, e.g., ARMPLL, GENPLL,
+LCPLL0, MIPIPLL, and etc., all derived from an onboard crystal. Each PLL
+comprises of several leaf clocks
+
+Required properties for PLLs:
+- compatible:
+    Should have a value of the form "brcm,<soc>-<pll>". For example, GENPLL on
+Cygnus has a compatible string of "brcm,cygnus-genpll"
+
+- #clock-cells:
+    Must be <0>
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL
+
+- clocks:
+    The input parent clock phandle for the PLL. For all iProc PLLs, this is an
+onboard crystal with a fixed rate
+
+Optional Properties for PLLs:
+- clock-frequency:
+    PLL frequency in Hz. If specified, PLL will be configured to run at
+<clock-frequency> instead of the default frequency after chip reset, provided
+that <clock-frequency> and its parameters are defined in the SoC specific
+frequency parameter table
+
+Example:
+
+	osc: oscillator {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <25000000>;
+	};
+
+	genpll: genpll {
+		#clock-cells = <0>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
+	};
+
+Required properties for leaf clocks of a PLL:
+
+- compatible:
+    Should have a value of the form "brcm,<soc>-<pll>-clk". For example, leaf
+clocks derived from the GENPLL on Cygnus SoC have a compatible string of
+"brcm,cygnus-genpll-clk"
+
+- #clock-cells:
+    Have a value of <1> since there are more than 1 leaf clock of a
+given PLL
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL leaf clocks
+
+- clocks:
+    The input parent PLL phandle for the leaf clock
+
+- clock-output-names:
+    An ordered list of strings defining the names of the leaf clocks
+
+Example:
+
+	genpll: genpll {
+		#clock-cells = <0>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
+	};
+
+	genpll_clks: genpll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-genpll-clk";
+		reg = <0x0301d000 0x2c>;
+		clocks = <&genpll>;
+		clock-output-names = "axi21", "250mhz", "ihost_sys",
+			"enet_sw", "audio_125", "can";
+	};
+
+Required properties for ASIU clocks:
+
+ASIU clocks are a special case. These clocks are derived directly from the
+reference clock of the onboard crystal
+
+- compatible:
+    Should have a value of the form "brcm,<soc>-asiu-clk". For example, ASIU
+clocks for Cygnus have a compatible string of "brcm,cygnus-asiu-clk"
+
+- #clock-cells:
+    Have a value of <1> since there are more than 1 ASIU clocks
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for ASIU clocks
+
+- clocks:
+    The input parent clock phandle for the ASIU clock, i.e., the onboard
+crystal
+
+- clock-output-names:
+    An ordered list of strings defining the names of the ASIU clocks
+
+Example:
+
+	osc: oscillator {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <25000000>;
+	};
+
+	asiu_clks: asiu_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-asiu-clk";
+		reg = <0x0301d048 0xc>,
+			<0x180aa024 0x4>;
+		clocks = <&osc>;
+		clock-output-names = "keypad", "adc/touch", "pwm";
+	};
+
+Cygnus
+------
+PLL and leaf clock compatible strings for Cygnus are:
+    "brcm,cygnus-armpll"
+    "brcm,cygnus-genpll"
+    "brcm,cygnus-lcpll0"
+    "brcm,cygnus-mipipll"
+    "brcm,cygnus-genpll-clk"
+    "brcm,cygnus-lcpll0-clk"
+    "brcm,cygnus-mipipll-clk"
+    "brcm,cygnus-asiu-clk"
+
+The following table defines the set of PLL/clock index and ID for Cygnus.
+These clock IDs are defined in:
+    "include/dt-bindings/clock/bcm-cygnus.h"
+
+    Clock      Source           Index   ID
+    ---        -----            -----   ---------
+    crystal    N/A              N/A     N/A
+
+    armpll     crystal          N/A     N/A
+    genpll     crystal          N/A     N/A
+    lcpll0     crystal          N/A     N/A
+    mipipll    crystal          N/A     N/A
+
+    keypad     crystal (ASIU)   0       BCM_CYGNUS_ASIU_KEYPAD_CLK
+    adc/tsc    crystal (ASIU)   1       BCM_CYGNUS_ASIU_ADC_CLK
+    pwm        crystal (ASIU)   2       BCM_CYGNUS_ASIU_PWM_CLK
+
+    axi21      genpll           0       BCM_CYGNUS_GENPLL_AXI21_CLK
+    250mhz     genpll           1       BCM_CYGNUS_GENPLL_250MHZ_CLK
+    ihost_sys  genpll           2       BCM_CYGNUS_GENPLL_IHOST_SYS_CLK
+    enet_sw    genpll           3       BCM_CYGNUS_GENPLL_ENET_SW_CLK
+    audio_125  genpll           4       BCM_CYGNUS_GENPLL_AUDIO_125_CLK
+    can        genpll           5       BCM_CYGNUS_GENPLL_CAN_CLK
+
+    pcie_phy   lcpll0           0       BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK
+    ddr_phy    lcpll0           1       BCM_CYGNUS_LCPLL0_DDR_PHY_CLK
+    sdio       lcpll0           2       BCM_CYGNUS_LCPLL0_SDIO_CLK
+    usb_phy    lcpll0           3       BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK
+    smart_card lcpll0           4       BCM_CYGNUS_LCPLL0_SMART_CARD_CLK
+    ch5        lcpll0           5       BCM_CYGNUS_LCPLL0_CH5_UNUSED
+
+    ch0_unused mipipll          0       BCM_CYGNUS_MIPIPLL_CH0_UNUSED
+    ch1_lcd    mipipll          1       BCM_CYGNUS_MIPIPLL_CH1_LCD
+    ch2_unused mipipll          2       BCM_CYGNUS_MIPIPLL_CH2_UNUSED
+    ch3_unused mipipll          3       BCM_CYGNUS_MIPIPLL_CH3_UNUSED
+    ch4_unused mipipll          4       BCM_CYGNUS_MIPIPLL_CH4_UNUSED
+    ch5_unused mipipll          5       BCM_CYGNUS_MIPIPLL_CH5_UNUSED
-- 
1.7.9.5

[PATCH v2 1/5] clk: iproc: define Broadcom iProc clock binding

[Ray Jui]

Document the device tree binding for Broadcom iProc architecture based
clock controller

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 brcm,iproc-clocks.txt |  178 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 178 insertions(+)
 create mode 100644 brcm,iproc-clocks.txt

diff --git a/brcm,iproc-clocks.txt b/brcm,iproc-clocks.txt
new file mode 100644
index 0000000..cc64fd2
--- /dev/null
+++ b/brcm,iproc-clocks.txt
@@ -0,0 +1,178 @@
+Broadcom iProc Family Clocks
+
+This binding uses the common clock binding:
+    Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+The iProc clock controller manages clocks that are common to the iProc family.
+An SoC from the iProc family may have several PPLs, e.g., ARMPLL, GENPLL,
+LCPLL0, MIPIPLL, and etc., all derived from an onboard crystal. Each PLL
+comprises of several leaf clocks
+
+Required properties for PLLs:
+- compatible:
+    Should have a value of the form "brcm,<soc>-<pll>". For example, GENPLL on
+Cygnus has a compatible string of "brcm,cygnus-genpll"
+
+- #clock-cells:
+    Must be <0>
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL
+
+- clocks:
+    The input parent clock phandle for the PLL. For all iProc PLLs, this is an
+onboard crystal with a fixed rate
+
+Optional Properties for PLLs:
+- clock-frequency:
+    PLL frequency in Hz. If specified, PLL will be configured to run at
+<clock-frequency> instead of the default frequency after chip reset, provided
+that <clock-frequency> and its parameters are defined in the SoC specific
+frequency parameter table
+
+Example:
+
+	osc: oscillator {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <25000000>;
+	};
+
+	genpll: genpll {
+		#clock-cells = <0>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
+	};
+
+Required properties for leaf clocks of a PLL:
+
+- compatible:
+    Should have a value of the form "brcm,<soc>-<pll>-clk". For example, leaf
+clocks derived from the GENPLL on Cygnus SoC have a compatible string of
+"brcm,cygnus-genpll-clk"
+
+- #clock-cells:
+    Have a value of <1> since there are more than 1 leaf clock of a
+given PLL
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL leaf clocks
+
+- clocks:
+    The input parent PLL phandle for the leaf clock
+
+- clock-output-names:
+    An ordered list of strings defining the names of the leaf clocks
+
+Example:
+
+	genpll: genpll {
+		#clock-cells = <0>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
+	};
+
+	genpll_clks: genpll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-genpll-clk";
+		reg = <0x0301d000 0x2c>;
+		clocks = <&genpll>;
+		clock-output-names = "axi21", "250mhz", "ihost_sys",
+			"enet_sw", "audio_125", "can";
+	};
+
+Required properties for ASIU clocks:
+
+ASIU clocks are a special case. These clocks are derived directly from the
+reference clock of the onboard crystal
+
+- compatible:
+    Should have a value of the form "brcm,<soc>-asiu-clk". For example, ASIU
+clocks for Cygnus have a compatible string of "brcm,cygnus-asiu-clk"
+
+- #clock-cells:
+    Have a value of <1> since there are more than 1 ASIU clocks
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for ASIU clocks
+
+- clocks:
+    The input parent clock phandle for the ASIU clock, i.e., the onboard
+crystal
+
+- clock-output-names:
+    An ordered list of strings defining the names of the ASIU clocks
+
+Example:
+
+	osc: oscillator {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <25000000>;
+	};
+
+	asiu_clks: asiu_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-asiu-clk";
+		reg = <0x0301d048 0xc>,
+			<0x180aa024 0x4>;
+		clocks = <&osc>;
+		clock-output-names = "keypad", "adc/touch", "pwm";
+	};
+
+Cygnus
+------
+PLL and leaf clock compatible strings for Cygnus are:
+    "brcm,cygnus-armpll"
+    "brcm,cygnus-genpll"
+    "brcm,cygnus-lcpll0"
+    "brcm,cygnus-mipipll"
+    "brcm,cygnus-genpll-clk"
+    "brcm,cygnus-lcpll0-clk"
+    "brcm,cygnus-mipipll-clk"
+    "brcm,cygnus-asiu-clk"
+
+The following table defines the set of PLL/clock index and ID for Cygnus.
+These clock IDs are defined in:
+    "include/dt-bindings/clock/bcm-cygnus.h"
+
+    Clock      Source           Index   ID
+    ---        -----            -----   ---------
+    crystal    N/A              N/A     N/A
+
+    armpll     crystal          N/A     N/A
+    genpll     crystal          N/A     N/A
+    lcpll0     crystal          N/A     N/A
+    mipipll    crystal          N/A     N/A
+
+    keypad     crystal (ASIU)   0       BCM_CYGNUS_ASIU_KEYPAD_CLK
+    adc/tsc    crystal (ASIU)   1       BCM_CYGNUS_ASIU_ADC_CLK
+    pwm        crystal (ASIU)   2       BCM_CYGNUS_ASIU_PWM_CLK
+
+    axi21      genpll           0       BCM_CYGNUS_GENPLL_AXI21_CLK
+    250mhz     genpll           1       BCM_CYGNUS_GENPLL_250MHZ_CLK
+    ihost_sys  genpll           2       BCM_CYGNUS_GENPLL_IHOST_SYS_CLK
+    enet_sw    genpll           3       BCM_CYGNUS_GENPLL_ENET_SW_CLK
+    audio_125  genpll           4       BCM_CYGNUS_GENPLL_AUDIO_125_CLK
+    can        genpll           5       BCM_CYGNUS_GENPLL_CAN_CLK
+
+    pcie_phy   lcpll0           0       BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK
+    ddr_phy    lcpll0           1       BCM_CYGNUS_LCPLL0_DDR_PHY_CLK
+    sdio       lcpll0           2       BCM_CYGNUS_LCPLL0_SDIO_CLK
+    usb_phy    lcpll0           3       BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK
+    smart_card lcpll0           4       BCM_CYGNUS_LCPLL0_SMART_CARD_CLK
+    ch5        lcpll0           5       BCM_CYGNUS_LCPLL0_CH5_UNUSED
+
+    ch0_unused mipipll          0       BCM_CYGNUS_MIPIPLL_CH0_UNUSED
+    ch1_lcd    mipipll          1       BCM_CYGNUS_MIPIPLL_CH1_LCD
+    ch2_unused mipipll          2       BCM_CYGNUS_MIPIPLL_CH2_UNUSED
+    ch3_unused mipipll          3       BCM_CYGNUS_MIPIPLL_CH3_UNUSED
+    ch4_unused mipipll          4       BCM_CYGNUS_MIPIPLL_CH4_UNUSED
+    ch5_unused mipipll          5       BCM_CYGNUS_MIPIPLL_CH5_UNUSED
-- 
1.7.9.5

[PATCH v2 2/5] clk: iproc: add initial common clock support

[Ray Jui]

This adds basic and generic support for various iProc PLLs and clocks
including the ARMPLL, GENPLL, LCPLL, MIPIPLL, and ASIU clocks.

SoCs under the iProc architecture can define their specific register
offsets and clock parameters for their PLL and clock controllers. These
parameters can be passed as arugments into the generic iProc PLL and
clock setup functions

Derived from code originally provided by Jonathan Richardson
<jonathar@broadcom.com>

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/clk/bcm/Kconfig            |    9 +
 drivers/clk/bcm/Makefile           |    1 +
 drivers/clk/bcm/clk-iproc-armpll.c |  286 +++++++++++++++++++++
 drivers/clk/bcm/clk-iproc-asiu.c   |  275 ++++++++++++++++++++
 drivers/clk/bcm/clk-iproc-clk.c    |  238 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-pll.c    |  483 ++++++++++++++++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc.h        |  155 ++++++++++++
 7 files changed, 1447 insertions(+)
 create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
 create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
 create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
 create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
 create mode 100644 drivers/clk/bcm/clk-iproc.h

diff --git a/drivers/clk/bcm/Kconfig b/drivers/clk/bcm/Kconfig
index 75506e5..66b5b7f 100644
--- a/drivers/clk/bcm/Kconfig
+++ b/drivers/clk/bcm/Kconfig
@@ -7,3 +7,12 @@ config CLK_BCM_KONA
 	  Enable common clock framework support for Broadcom SoCs
 	  using "Kona" style clock control units, including those
 	  in the BCM281xx and BCM21664 families.
+
+config COMMON_CLK_IPROC
+	bool "Broadcom iProc clock support"
+	depends on ARCH_BCM_IPROC
+	depends on COMMON_CLK
+	default y
+	help
+	  Enable common clock framework support for Broadcom SoCs
+	  based on the "iProc" architecture
diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
index 6297d05..6926636 100644
--- a/drivers/clk/bcm/Makefile
+++ b/drivers/clk/bcm/Makefile
@@ -2,3 +2,4 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
+obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
diff --git a/drivers/clk/bcm/clk-iproc-armpll.c b/drivers/clk/bcm/clk-iproc-armpll.c
new file mode 100644
index 0000000..ec9b130
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-armpll.c
@@ -0,0 +1,286 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+
+#define IPROC_CLK_MAX_FREQ_POLICY                    0x3
+#define IPROC_CLK_POLICY_FREQ_OFFSET                 0x008
+#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT      8
+#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK       0x7
+
+#define IPROC_CLK_PLLARMA_OFFSET                     0xc00
+#define IPROC_CLK_PLLARMA_LOCK_SHIFT                 28
+#define IPROC_CLK_PLLARMA_PDIV_SHIFT                 24
+#define IPROC_CLK_PLLARMA_PDIV_MASK                  0xf
+#define IPROC_CLK_PLLARMA_NDIV_INT_SHIFT             8
+#define IPROC_CLK_PLLARMA_NDIV_INT_MASK              0x3ff
+
+#define IPROC_CLK_PLLARMB_OFFSET                     0xc04
+#define IPROC_CLK_PLLARMB_NDIV_FRAC_MASK             0xfffff
+
+#define IPROC_CLK_PLLARMC_OFFSET                     0xc08
+#define IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT            8
+#define IPROC_CLK_PLLARMC_MDIV_MASK                  0xff
+
+#define IPROC_CLK_PLLARMCTL5_OFFSET                  0xc20
+#define IPROC_CLK_PLLARMCTL5_H_MDIV_MASK             0xff
+
+#define IPROC_CLK_PLLARM_OFFSET_OFFSET               0xc24
+#define IPROC_CLK_PLLARM_SW_CTL_SHIFT                29
+#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT       20
+#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK        0xff
+#define IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK       0xfffff
+
+#define IPROC_CLK_ARM_DIV_OFFSET                     0xe00
+#define IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT  4
+#define IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK        0xf
+
+#define IPROC_CLK_POLICY_DBG_OFFSET                  0xec0
+#define IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT          12
+#define IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK           0x7
+
+enum iproc_arm_pll_fid {
+	ARM_PLL_FID_CRYSTAL_CLK   = 0,
+	ARM_PLL_FID_SYS_CLK       = 2,
+	ARM_PLL_FID_CH0_SLOW_CLK  = 6,
+	ARM_PLL_FID_CH1_FAST_CLK  = 7
+};
+
+struct iproc_arm_pll {
+	struct clk_hw hw;
+	void __iomem *base;
+	struct clk_onecell_data clk_data;
+	unsigned long rate;
+};
+
+#define to_iproc_arm_pll(hw) container_of(hw, struct iproc_arm_pll, hw)
+
+static unsigned int __get_fid(struct iproc_arm_pll *pll)
+{
+	u32 val;
+	unsigned int policy, fid, active_fid;
+
+	val = readl(pll->base + IPROC_CLK_ARM_DIV_OFFSET);
+	if (val & (1 << IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT))
+		policy = val & IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK;
+	else
+		policy = 0;
+
+	/* something is seriously wrong */
+	BUG_ON(policy > IPROC_CLK_MAX_FREQ_POLICY);
+
+	val = readl(pll->base + IPROC_CLK_POLICY_FREQ_OFFSET);
+	fid = (val >> (IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT * policy)) &
+		IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK;
+
+	val = readl(pll->base + IPROC_CLK_POLICY_DBG_OFFSET);
+	active_fid = IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK &
+		(val >> IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT);
+	if (fid != active_fid) {
+		pr_debug("%s: fid override %u->%u\n", __func__,	fid,
+				active_fid);
+		fid = active_fid;
+	}
+
+	pr_debug("%s: active fid: %u\n", __func__, fid);
+
+	return fid;
+}
+
+/*
+ * Determine the mdiv (post divider) based on the frequency ID being used.
+ * There are 4 sources that can be used to derive the output clock rate:
+ *    - 25 MHz Crystal
+ *    - System clock
+ *    - PLL channel 0 (slow clock)
+ *    - PLL channel 1 (fast clock)
+ */
+static int __get_mdiv(struct iproc_arm_pll *pll)
+{
+	unsigned int fid;
+	int mdiv;
+	u32 val;
+
+	fid = __get_fid(pll);
+
+	switch (fid) {
+	case ARM_PLL_FID_CRYSTAL_CLK:
+	case ARM_PLL_FID_SYS_CLK:
+		mdiv = 1;
+		break;
+
+	case ARM_PLL_FID_CH0_SLOW_CLK:
+		val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
+		mdiv = val & IPROC_CLK_PLLARMC_MDIV_MASK;
+		if (mdiv == 0)
+			mdiv = 256;
+		break;
+
+	case ARM_PLL_FID_CH1_FAST_CLK:
+		val = readl(pll->base +	IPROC_CLK_PLLARMCTL5_OFFSET);
+		mdiv = val & IPROC_CLK_PLLARMCTL5_H_MDIV_MASK;
+		if (mdiv == 0)
+			mdiv = 256;
+		break;
+
+	default:
+		mdiv = -EFAULT;
+	}
+
+	return mdiv;
+}
+
+static unsigned int __get_ndiv(struct iproc_arm_pll *pll)
+{
+	u32 val;
+	unsigned int ndiv_int, ndiv_frac, ndiv;
+
+	val = readl(pll->base + IPROC_CLK_PLLARM_OFFSET_OFFSET);
+	if (val & (1 << IPROC_CLK_PLLARM_SW_CTL_SHIFT)) {
+		/*
+		 * offset mode is active. Read the ndiv from the PLLARM OFFSET
+		 * register
+		 */
+		ndiv_int = (val >> IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT) &
+			IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK;
+		if (ndiv_int == 0)
+			ndiv_int = 256;
+
+		ndiv_frac = val & IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK;
+	} else {
+		/* offset mode not active */
+		val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
+		ndiv_int = (val >> IPROC_CLK_PLLARMA_NDIV_INT_SHIFT) &
+			IPROC_CLK_PLLARMA_NDIV_INT_MASK;
+		if (ndiv_int == 0)
+			ndiv_int = 1024;
+
+		val = readl(pll->base + IPROC_CLK_PLLARMB_OFFSET);
+		ndiv_frac = val & IPROC_CLK_PLLARMB_NDIV_FRAC_MASK;
+	}
+
+	ndiv = (ndiv_int << 20) | ndiv_frac;
+
+	return ndiv;
+}
+
+/*
+ * The output frequency of the ARM PLL is calculated based on the ARM PLL
+ * divider values:
+ *   pdiv = ARM PLL pre-divider
+ *   ndiv = ARM PLL multiplier
+ *   mdiv = ARM PLL post divider
+ *
+ * The frequency is calculated by:
+ *   ((ndiv * parent clock rate) / pdiv) / mdiv
+ */
+static unsigned long iproc_arm_pll_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_arm_pll *pll = to_iproc_arm_pll(hw);
+	u32 val;
+	int mdiv;
+	u64 ndiv;
+	unsigned int pdiv;
+
+	/* in bypass mode, use parent rate */
+	val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
+	if (val & (1 << IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT)) {
+		pll->rate = parent_rate;
+		return pll->rate;
+	}
+
+	/* PLL needs to be locked */
+	val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
+	if (!(val & (1 << IPROC_CLK_PLLARMA_LOCK_SHIFT))) {
+		pll->rate = 0;
+		return 0;
+	}
+
+	pdiv = (val >> IPROC_CLK_PLLARMA_PDIV_SHIFT) &
+		IPROC_CLK_PLLARMA_PDIV_MASK;
+	if (pdiv == 0)
+		pdiv = 16;
+
+	ndiv = __get_ndiv(pll);
+	mdiv = __get_mdiv(pll);
+	if (mdiv <= 0) {
+		pll->rate = 0;
+		return 0;
+	}
+	pll->rate = (ndiv * parent_rate) >> 20;
+	pll->rate = (pll->rate / pdiv) / mdiv;
+
+	pr_debug("%s: ARM PLL rate: %lu. parent rate: %lu\n", __func__,
+			pll->rate, parent_rate);
+	pr_debug("%s: ndiv_int: %u, pdiv: %u, mdiv: %d\n", __func__,
+			(unsigned int)(ndiv >> 20), pdiv, mdiv);
+
+	return pll->rate;
+}
+
+static const struct clk_ops iproc_arm_pll_ops = {
+	.recalc_rate = iproc_arm_pll_recalc_rate,
+};
+
+void __init iproc_armpll_setup(struct device_node *node)
+{
+	int ret;
+	struct clk *clk;
+	struct iproc_arm_pll *pll;
+	struct clk_init_data init;
+	const char *parent_name;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->base = of_iomap(node, 0);
+	if (WARN_ON(!pll->base))
+		goto err_free_pll;
+
+	init.name = node->name;
+	init.ops = &iproc_arm_pll_ops;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	pll->hw.init = &init;
+
+	clk = clk_register(NULL, &pll->hw);
+	if (WARN_ON(IS_ERR(clk)))
+		goto err_iounmap;
+
+	pll->clk_data.clk_num = 1;
+	pll->clk_data.clks = &clk;
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_unregister;
+
+	return;
+
+err_clk_unregister:
+	clk_unregister(clk);
+err_iounmap:
+	iounmap(pll->base);
+err_free_pll:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc-asiu.c b/drivers/clk/bcm/clk-iproc-asiu.c
new file mode 100644
index 0000000..ab86b8c
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-asiu.c
@@ -0,0 +1,275 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+struct iproc_asiu;
+
+struct iproc_asiu_clk {
+	struct clk_hw hw;
+	const char *name;
+	struct iproc_asiu *asiu;
+	unsigned long rate;
+	struct iproc_asiu_div div;
+	struct iproc_asiu_gate gate;
+};
+
+struct iproc_asiu {
+	void __iomem *div_base;
+	void __iomem *gate_base;
+
+	struct clk_onecell_data clk_data;
+	struct iproc_asiu_clk *clks;
+};
+
+#define to_asiu_clk(hw) container_of(hw, struct iproc_asiu_clk, hw)
+
+static int iproc_asiu_clk_enable(struct clk_hw *hw)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+
+	/* some clocks at the ASIU level are always enabled */
+	if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
+		return 0;
+
+	val = readl(asiu->gate_base + clk->gate.offset);
+	val |= (1 << clk->gate.en_shift);
+	writel(val, asiu->gate_base + clk->gate.offset);
+
+	return 0;
+}
+
+static void iproc_asiu_clk_disable(struct clk_hw *hw)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+
+	/* some clocks at the ASIU level are always enabled */
+	if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
+		return;
+
+	val = readl(asiu->gate_base + clk->gate.offset);
+	val &= ~(1 << clk->gate.en_shift);
+	writel(val, asiu->gate_base + clk->gate.offset);
+}
+
+static unsigned long iproc_asiu_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+	unsigned int div_h, div_l;
+
+	if (parent_rate == 0) {
+		clk->rate = 0;
+		return 0;
+	}
+
+	/* if clock divisor is not enabled, simply return parent rate */
+	val = readl(asiu->div_base + clk->div.offset);
+	if ((val & (1 << clk->div.en_shift)) == 0) {
+		clk->rate = parent_rate;
+		return parent_rate;
+	}
+
+	/* clock rate = parent rate / (high_div + 1) + (low_div + 1) */
+	div_h = (val >> clk->div.high_shift) & bit_mask(clk->div.high_width);
+	div_h++;
+	div_l = (val >> clk->div.low_shift) & bit_mask(clk->div.low_width);
+	div_l++;
+
+	clk->rate = parent_rate / (div_h + div_l);
+	pr_debug("%s: rate: %lu. parent rate: %lu div_h: %u div_l: %u\n",
+		__func__, clk->rate, parent_rate, div_h, div_l);
+
+	return clk->rate;
+}
+
+static long iproc_asiu_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	unsigned int div;
+
+	if (rate == 0 || *parent_rate == 0)
+		return -EINVAL;
+
+	if (rate == *parent_rate)
+		return *parent_rate;
+
+	div = DIV_ROUND_UP(*parent_rate, rate);
+	if (div < 2)
+		return *parent_rate;
+
+	return *parent_rate / div;
+}
+
+static int iproc_asiu_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	unsigned int div, div_h, div_l;
+	u32 val;
+
+	if (rate == 0 || parent_rate == 0)
+		return -EINVAL;
+
+	/* simply disable the divisor if one wants the same rate as parent */
+	if (rate == parent_rate) {
+		val = readl(asiu->div_base + clk->div.offset);
+		val &= ~(1 << clk->div.en_shift);
+		writel(val, asiu->div_base + clk->div.offset);
+		return 0;
+	}
+
+	div = DIV_ROUND_UP(parent_rate, rate);
+	if (div < 2)
+		return -EINVAL;
+
+	div_h = div_l = div >> 1;
+	div_h--;
+	div_l--;
+
+	val = readl(asiu->div_base + clk->div.offset);
+	val |= 1 << clk->div.en_shift;
+	if (div_h) {
+		val &= ~(bit_mask(clk->div.high_width)
+				<< clk->div.high_shift);
+		val |= div_h << clk->div.high_shift;
+	} else {
+		val &= ~(bit_mask(clk->div.high_width)
+				<< clk->div.high_shift);
+	}
+	if (div_l) {
+		val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
+		val |= div_l << clk->div.low_shift;
+	} else {
+		val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
+	}
+	writel(val, asiu->div_base + clk->div.offset);
+
+	return 0;
+}
+
+static const struct clk_ops iproc_asiu_ops = {
+	.enable = iproc_asiu_clk_enable,
+	.disable = iproc_asiu_clk_disable,
+	.recalc_rate = iproc_asiu_clk_recalc_rate,
+	.round_rate = iproc_asiu_clk_round_rate,
+	.set_rate = iproc_asiu_clk_set_rate,
+};
+
+void __init iproc_asiu_setup(struct device_node *node,
+		const struct iproc_asiu_div *div,
+		const struct iproc_asiu_gate *gate, unsigned int num_clks)
+{
+	int i, ret;
+	struct iproc_asiu *asiu;
+
+	if (WARN_ON(!gate || !div))
+		return;
+
+	asiu = kzalloc(sizeof(*asiu), GFP_KERNEL);
+	if (WARN_ON(!asiu))
+		return;
+
+	asiu->clk_data.clk_num = num_clks;
+	asiu->clk_data.clks = kcalloc(num_clks, sizeof(*asiu->clk_data.clks),
+			GFP_KERNEL);
+	if (WARN_ON(!asiu->clk_data.clks))
+		goto err_clks;
+
+	asiu->clks = kcalloc(num_clks, sizeof(*asiu->clks), GFP_KERNEL);
+	if (WARN_ON(!asiu->clks))
+		goto err_asiu_clks;
+
+	asiu->div_base = of_iomap(node, 0);
+	if (WARN_ON(!asiu->div_base))
+		goto err_iomap_div;
+
+	asiu->gate_base = of_iomap(node, 1);
+	if (WARN_ON(!asiu->gate_base))
+		goto err_iomap_gate;
+
+	for (i = 0; i < num_clks; i++) {
+		struct clk_init_data init;
+		struct clk *clk;
+		const char *parent_name;
+		struct iproc_asiu_clk *asiu_clk;
+		const char *clk_name;
+
+		clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
+		if (WARN_ON(!clk_name))
+			goto err_clk_register;
+
+		ret = of_property_read_string_index(node, "clock-output-names",
+				i, &clk_name);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+
+		asiu_clk = &asiu->clks[i];
+		asiu_clk->name = clk_name;
+		asiu_clk->asiu = asiu;
+		asiu_clk->div = div[i];
+		asiu_clk->gate = gate[i];
+		init.name = clk_name;
+		init.ops = &iproc_asiu_ops;
+		init.flags = 0;
+		parent_name = of_clk_get_parent_name(node, 0);
+		init.parent_names = (parent_name ? &parent_name : NULL);
+		init.num_parents = (parent_name ? 1 : 0);
+		asiu_clk->hw.init = &init;
+
+		clk = clk_register(NULL, &asiu_clk->hw);
+		if (WARN_ON(IS_ERR(clk)))
+			goto err_clk_register;
+		asiu->clk_data.clks[i] = clk;
+	}
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get,
+			&asiu->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_register;
+
+	return;
+
+err_clk_register:
+	for (i = 0; i < num_clks; i++)
+		kfree(asiu->clks[i].name);
+	iounmap(asiu->gate_base);
+
+err_iomap_gate:
+	iounmap(asiu->div_base);
+
+err_iomap_div:
+	kfree(asiu->clks);
+
+err_asiu_clks:
+	kfree(asiu->clk_data.clks);
+
+err_clks:
+	kfree(asiu);
+}
diff --git a/drivers/clk/bcm/clk-iproc-clk.c b/drivers/clk/bcm/clk-iproc-clk.c
new file mode 100644
index 0000000..be3c42c
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-clk.c
@@ -0,0 +1,238 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+struct iproc_pll;
+
+struct iproc_clk {
+	struct clk_hw hw;
+	const char *name;
+	struct iproc_pll *pll;
+	unsigned long rate;
+	const struct iproc_clk_ctrl *ctrl;
+};
+
+struct iproc_pll {
+	void __iomem *base;
+	struct clk_onecell_data clk_data;
+	struct iproc_clk *clks;
+};
+
+#define to_iproc_clk(hw) container_of(hw, struct iproc_clk, hw)
+
+static int iproc_clk_enable(struct clk_hw *hw)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+
+	/* channel enable is active low */
+	val = readl(pll->base + ctrl->enable.offset);
+	val &= ~(1 << ctrl->enable.enable_shift);
+	writel(val, pll->base + ctrl->enable.offset);
+
+	/* also make sure channel is not held */
+	val = readl(pll->base + ctrl->enable.offset);
+	val &= ~(1 << ctrl->enable.hold_shift);
+	writel(val, pll->base + ctrl->enable.offset);
+
+	return 0;
+}
+
+static void iproc_clk_disable(struct clk_hw *hw)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+
+	if (ctrl->flags & IPROC_CLK_AON)
+		return;
+
+	val = readl(pll->base + ctrl->enable.offset);
+	val |= 1 << ctrl->enable.enable_shift;
+	writel(val, pll->base + ctrl->enable.offset);
+}
+
+static unsigned long iproc_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+	unsigned int mdiv;
+
+	if (parent_rate == 0)
+		return 0;
+
+	val = readl(pll->base + ctrl->mdiv.offset);
+	mdiv = (val >> ctrl->mdiv.shift) & bit_mask(ctrl->mdiv.width);
+	if (mdiv == 0)
+		mdiv = 256;
+
+	clk->rate = parent_rate / mdiv;
+
+	return clk->rate;
+}
+
+static long iproc_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	unsigned int div;
+
+	if (rate == 0 || *parent_rate == 0)
+		return -EINVAL;
+
+	if (rate == *parent_rate)
+		return *parent_rate;
+
+	div = DIV_ROUND_UP(*parent_rate, rate);
+	if (div < 2)
+		return *parent_rate;
+
+	if (div > 256)
+		div = 256;
+
+	return *parent_rate / div;
+}
+
+static int iproc_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+	unsigned int div;
+
+	if (rate == 0 || parent_rate == 0)
+		return -EINVAL;
+
+	div = DIV_ROUND_UP(parent_rate, rate);
+	if (div > 256)
+		return -EINVAL;
+
+	val = readl(pll->base + ctrl->mdiv.offset);
+	if (div == 256) {
+		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
+	} else {
+		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
+		val |= div << ctrl->mdiv.shift;
+	}
+	writel(val, pll->base + ctrl->mdiv.offset);
+	clk->rate = parent_rate / div;
+
+	return 0;
+}
+
+static const struct clk_ops iproc_clk_ops = {
+	.enable = iproc_clk_enable,
+	.disable = iproc_clk_disable,
+	.recalc_rate = iproc_clk_recalc_rate,
+	.round_rate = iproc_clk_round_rate,
+	.set_rate = iproc_clk_set_rate,
+};
+
+void __init iproc_clk_setup(struct device_node *node,
+		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks)
+{
+	int i, ret;
+	struct iproc_pll *pll;
+
+	if (WARN_ON(!ctrl))
+		return;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->clk_data.clk_num = num_clks;
+	pll->clk_data.clks = kcalloc(num_clks, sizeof(*pll->clk_data.clks),
+			GFP_KERNEL);
+	if (WARN_ON(!pll->clk_data.clks))
+		goto err_clks;
+
+	pll->clks = kcalloc(num_clks, sizeof(*pll->clks), GFP_KERNEL);
+	if (WARN_ON(!pll->clks))
+		goto err_pll_clks;
+
+	pll->base = of_iomap(node, 0);
+	if (WARN_ON(!pll->base))
+		goto err_iomap;
+
+	for (i = 0; i < num_clks; i++) {
+		struct clk_init_data init;
+		struct clk *clk;
+		const char *parent_name;
+		struct iproc_clk *iclk;
+		const char *clk_name;
+
+		clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
+		if (WARN_ON(!clk_name))
+			goto err_clk_register;
+
+		ret = of_property_read_string_index(node, "clock-output-names",
+				i, &clk_name);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+
+		iclk = &pll->clks[i];
+		iclk->name = clk_name;
+		iclk->pll = pll;
+		iclk->ctrl = &ctrl[i];
+		init.name = clk_name;
+		init.ops = &iproc_clk_ops;
+		init.flags = 0;
+		parent_name = of_clk_get_parent_name(node, 0);
+		init.parent_names = (parent_name ? &parent_name : NULL);
+		init.num_parents = (parent_name ? 1 : 0);
+		iclk->hw.init = &init;
+
+		clk = clk_register(NULL, &iclk->hw);
+		if (WARN_ON(IS_ERR(clk)))
+			goto err_clk_register;
+		pll->clk_data.clks[i] = clk;
+	}
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_register;
+
+	return;
+
+err_clk_register:
+	for (i = 0; i < num_clks; i++)
+		kfree(pll->clks[i].name);
+	iounmap(pll->base);
+
+err_iomap:
+	kfree(pll->clks);
+
+err_pll_clks:
+	kfree(pll->clk_data.clks);
+
+err_clks:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc-pll.c b/drivers/clk/bcm/clk-iproc-pll.c
new file mode 100644
index 0000000..cd3bd38
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-pll.c
@@ -0,0 +1,483 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+#define PLL_VCO_HIGH_SHIFT 19
+#define PLL_VCO_LOW_SHIFT  30
+
+/* number of delay loops waiting for PLL to lock */
+#define LOCK_DELAY 100
+
+/* number of VCO frequency bands */
+#define NUM_FREQ_BANDS 8
+
+#define NUM_KP_BANDS 3
+enum kp_band {
+	KP_BAND_MID = 0,
+	KP_BAND_HIGH,
+	KP_BAND_HIGH_HIGH
+};
+
+static const unsigned int kp_table[NUM_KP_BANDS][NUM_FREQ_BANDS] = {
+	{ 5, 6, 6, 7, 7, 8, 9, 10 },
+	{ 4, 4, 5, 5, 6, 7, 8, 9  },
+	{ 4, 5, 5, 6, 7, 8, 9, 10 },
+};
+
+static const unsigned long ref_freq_table[NUM_FREQ_BANDS][2] = {
+	{ 10000000,  12500000  },
+	{ 12500000,  15000000  },
+	{ 15000000,  20000000  },
+	{ 20000000,  25000000  },
+	{ 25000000,  50000000  },
+	{ 50000000,  75000000  },
+	{ 75000000,  100000000 },
+	{ 100000000, 125000000 },
+};
+
+enum vco_freq_range {
+	VCO_LOW       = 700000000U,
+	VCO_MID       = 1200000000U,
+	VCO_HIGH      = 2200000000U,
+	VCO_HIGH_HIGH = 3100000000U,
+	VCO_MAX       = 4000000000U,
+};
+
+struct iproc_pll {
+	struct clk_hw hw;
+	void __iomem *pll_base;
+	void __iomem *pwr_base;
+	void __iomem *asiu_base;
+	struct clk_onecell_data clk_data;
+	const char *name;
+	const struct iproc_pll_ctrl *ctrl;
+	const struct iproc_pll_vco_freq_param *vco_param;
+	unsigned int num_vco_entries;
+	unsigned long rate;
+};
+
+#define to_iproc_pll(hw) container_of(hw, struct iproc_pll, hw)
+
+/*
+ * Get the clock rate based on name
+ */
+static unsigned long __get_rate(const char *clk_name)
+{
+	struct clk *clk;
+
+	clk = __clk_lookup(clk_name);
+	if (!clk) {
+		pr_err("%s: unable to find clock by name: %s\n", __func__,
+				clk_name);
+		return 0;
+	}
+
+	return clk_get_rate(clk);
+}
+
+/*
+ * Based on the target frequency, find a match from the VCO frequency parameter
+ * table and return its index
+ */
+static int pll_get_rate_index(struct iproc_pll *pll, unsigned int target_rate)
+{
+	int i;
+
+	for (i = 0; i < pll->num_vco_entries; i++)
+		if (target_rate == pll->vco_param[i].rate)
+			break;
+
+	if (i >= pll->num_vco_entries)
+		return -EINVAL;
+
+	return i;
+}
+
+static int get_kp(unsigned long ref_freq, enum kp_band kp_index)
+{
+	int i;
+
+	if (ref_freq < ref_freq_table[0][0])
+		return -EINVAL;
+
+	for (i = 0; i < NUM_FREQ_BANDS; i++) {
+		if (ref_freq >= ref_freq_table[i][0] &&
+			ref_freq < ref_freq_table[i][1])
+			return kp_table[kp_index][i];
+	}
+	return -EINVAL;
+}
+
+static int pll_wait_for_lock(struct iproc_pll *pll)
+{
+	int i;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+
+	for (i = 0; i < LOCK_DELAY; i++) {
+		u32 val = readl(pll->pll_base + ctrl->status.offset);
+
+		if (val & (1 << ctrl->status.shift))
+			return 0;
+		udelay(10);
+	}
+
+	return -EIO;
+}
+
+static void __pll_disable(struct iproc_pll *pll)
+{
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		val = readl(pll->asiu_base + ctrl->asiu.offset);
+		val &= ~(1 << ctrl->asiu.en_shift);
+		writel(val, pll->asiu_base + ctrl->asiu.offset);
+	}
+
+	/* latch input value so core power can be shut down */
+	val = readl(pll->pwr_base + ctrl->aon.offset);
+	val |= (1 << ctrl->aon.iso_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+
+	/* power down the core */
+	val &= ~(bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+}
+
+static int __pll_enable(struct iproc_pll *pll)
+{
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+
+	/* power up the PLL and make sure it's not latched */
+	val = readl(pll->pwr_base + ctrl->aon.offset);
+	val |= bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift;
+	val &= ~(1 << ctrl->aon.iso_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+
+	/* certain PLLs also need to be ungated from the ASIU top level */
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		val = readl(pll->asiu_base + ctrl->asiu.offset);
+		val |= (1 << ctrl->asiu.en_shift);
+		writel(val, pll->asiu_base + ctrl->asiu.offset);
+	}
+
+	return 0;
+}
+
+static void __pll_put_in_reset(struct iproc_pll *pll)
+{
+	u32 val;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
+
+	val = readl(pll->pll_base + reset->offset);
+	val &= ~(1 << reset->reset_shift | 1 << reset->p_reset_shift);
+	writel(val, pll->pll_base + reset->offset);
+}
+
+static void __pll_bring_out_reset(struct iproc_pll *pll, unsigned int kp,
+		unsigned int ka, unsigned int ki)
+{
+	u32 val;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
+
+	val = readl(pll->pll_base + reset->offset);
+	val &= ~(bit_mask(reset->ki_width) << reset->ki_shift |
+		bit_mask(reset->kp_width) << reset->kp_shift |
+		bit_mask(reset->ka_width) << reset->ka_shift);
+	val |=  ki << reset->ki_shift | kp << reset->kp_shift |
+		ka << reset->ka_shift;
+	val |= 1 << reset->reset_shift | 1 << reset->p_reset_shift;
+	writel(val, pll->pll_base + reset->offset);
+}
+
+static int pll_set_rate(struct iproc_pll *pll, unsigned int rate_index,
+		unsigned long parent_rate)
+{
+	const struct iproc_pll_vco_freq_param *vco =
+				&pll->vco_param[rate_index];
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	int ka = 0, ki, kp, ret;
+	unsigned long rate = vco->rate;
+	u32 val;
+	enum kp_band kp_index;
+	unsigned long ref_freq;
+
+	/*
+	 * reference frequency = parent frequency / PDIV
+	 * If PDIV = 0, then it becomes a multiplier (x2)
+	 */
+	if (vco->pdiv == 0)
+		ref_freq = parent_rate * 2;
+	else
+		ref_freq = parent_rate / vco->pdiv;
+
+	/* determine Ki and Kp index based on target VCO frequency */
+	if (rate >= VCO_LOW && rate < VCO_HIGH) {
+		ki = 4;
+		kp_index = KP_BAND_MID;
+	} else if (rate >= VCO_HIGH && rate && rate < VCO_HIGH_HIGH) {
+		ki = 3;
+		kp_index = KP_BAND_HIGH;
+	} else if (rate >= VCO_HIGH_HIGH && rate < VCO_MAX) {
+		ki = 3;
+		kp_index = KP_BAND_HIGH_HIGH;
+	} else {
+		pr_err("%s: pll: %s has invalid rate: %lu\n", __func__,
+				pll->name, rate);
+		return -EINVAL;
+	}
+
+	kp = get_kp(ref_freq, kp_index);
+	if (kp < 0) {
+		pr_err("%s: pll: %s has invalid kp\n", __func__, pll->name);
+		return kp;
+	}
+
+	ret = __pll_enable(pll);
+	if (ret) {
+		pr_err("%s: pll: %s fails to enable\n", __func__, pll->name);
+		return ret;
+	}
+
+	/* put PLL in reset */
+	__pll_put_in_reset(pll);
+
+	writel(0, pll->pll_base + ctrl->vco_ctrl.u_offset);
+	val = readl(pll->pll_base + ctrl->vco_ctrl.l_offset);
+
+	if (rate >= VCO_LOW && rate < VCO_MID)
+		val |= (1 << PLL_VCO_LOW_SHIFT);
+
+	if (rate < VCO_HIGH)
+		val &= ~(1 << PLL_VCO_HIGH_SHIFT);
+	else
+		val |= (1 << PLL_VCO_HIGH_SHIFT);
+
+	writel(val, pll->pll_base + ctrl->vco_ctrl.l_offset);
+
+	/* program integer part of NDIV */
+	val = readl(pll->pll_base + ctrl->ndiv_int.offset);
+	val &= ~(bit_mask(ctrl->ndiv_int.width) << ctrl->ndiv_int.shift);
+	val |= vco->ndiv_int << ctrl->ndiv_int.shift;
+	writel(val, pll->pll_base + ctrl->ndiv_int.offset);
+
+	/* program fractional part of NDIV */
+	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
+		val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
+		val &= ~(bit_mask(ctrl->ndiv_frac.width) <<
+				ctrl->ndiv_frac.shift);
+		val |= vco->ndiv_frac << ctrl->ndiv_frac.shift;
+		writel(val, pll->pll_base + ctrl->ndiv_frac.offset);
+	}
+
+	/* program PDIV */
+	val = readl(pll->pll_base + ctrl->pdiv.offset);
+	val &= ~(bit_mask(ctrl->pdiv.width) << ctrl->pdiv.shift);
+	val |= vco->pdiv << ctrl->pdiv.shift;
+	writel(val, pll->pll_base + ctrl->pdiv.offset);
+
+	__pll_bring_out_reset(pll, kp, ka, ki);
+
+	ret = pll_wait_for_lock(pll);
+	if (ret < 0) {
+		pr_err("%s: pll: %s failed to lock\n", __func__, pll->name);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int iproc_pll_enable(struct clk_hw *hw)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+
+	return __pll_enable(pll);
+}
+
+static void iproc_pll_disable(struct clk_hw *hw)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+
+	if (ctrl->flags & IPROC_CLK_AON)
+		return;
+
+	__pll_disable(pll);
+}
+
+static unsigned long iproc_pll_recalc_rate(struct clk_hw *hw,
+	unsigned long parent_rate)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+	u64 ndiv;
+	unsigned int ndiv_int, ndiv_frac, pdiv;
+
+	if (parent_rate == 0)
+		return 0;
+
+	/* PLL needs to be locked */
+	val = readl(pll->pll_base + ctrl->status.offset);
+	if ((val & (1 << ctrl->status.shift)) == 0) {
+		pll->rate = 0;
+		return 0;
+	}
+
+	/*
+	 * PLL output frequency =
+	 *
+	 * ((ndiv_int + ndiv_frac / 2^20) * (parent clock rate / pdiv)
+	 */
+	val = readl(pll->pll_base + ctrl->ndiv_int.offset);
+	ndiv_int = (val >> ctrl->ndiv_int.shift) &
+		bit_mask(ctrl->ndiv_int.width);
+	ndiv = ndiv_int << ctrl->ndiv_int.shift;
+
+	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
+		val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
+		ndiv_frac = (val >> ctrl->ndiv_frac.shift) &
+			bit_mask(ctrl->ndiv_frac.width);
+
+		if (ndiv_frac != 0)
+			ndiv = (ndiv_int << ctrl->ndiv_int.shift) | ndiv_frac;
+	}
+
+	val = readl(pll->pll_base + ctrl->pdiv.offset);
+	pdiv = (val >> ctrl->pdiv.shift) & bit_mask(ctrl->pdiv.width);
+
+	pll->rate = (ndiv * parent_rate) >> ctrl->ndiv_int.shift;
+
+	if (pdiv == 0)
+		pll->rate *= 2;
+	else
+		pll->rate /= pdiv;
+
+	return pll->rate;
+}
+
+static const struct clk_ops iproc_pll_ops = {
+	.enable = iproc_pll_enable,
+	.disable = iproc_pll_disable,
+	.recalc_rate = iproc_pll_recalc_rate,
+};
+
+void __init iproc_pll_setup(struct device_node *node,
+		const struct iproc_pll_ctrl *ctrl,
+		const struct iproc_pll_vco_freq_param *vco_param,
+		unsigned int num_vco_entries)
+{
+	int ret;
+	struct clk *clk;
+	struct iproc_pll *pll;
+	struct clk_init_data init;
+	const char *parent_name;
+	unsigned int rate;
+
+	if (WARN_ON(!ctrl))
+		return;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->pll_base = of_iomap(node, 0);
+	if (WARN_ON(!pll->pll_base))
+		goto err_pll_iomap;
+
+	pll->pwr_base = of_iomap(node, 1);
+	if (WARN_ON(!pll->pwr_base))
+		goto err_pwr_iomap;
+
+	/* some PLLs require gating control at the top ASIU level */
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		pll->asiu_base = of_iomap(node, 2);
+		if (WARN_ON(!pll->asiu_base))
+			goto err_asiu_iomap;
+	}
+
+	pll->ctrl = ctrl;
+	pll->name = node->name;
+	init.name = node->name;
+	init.ops = &iproc_pll_ops;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	pll->hw.init = &init;
+
+	/* configure the PLL to the desired VCO frequency if specified */
+	ret = of_property_read_u32(node, "clock-frequency", &rate);
+	if (!ret) {
+		unsigned long parent_rate;
+		int rate_index;
+
+		if (WARN_ON(!vco_param))
+			goto err_clk_register;
+
+		pll->num_vco_entries = num_vco_entries;
+		pll->vco_param = vco_param;
+
+		parent_rate = __get_rate(parent_name);
+		if (WARN_ON(!parent_rate))
+			goto err_clk_register;
+
+		rate_index = pll_get_rate_index(pll, rate);
+		if (WARN_ON(rate_index < 0))
+			goto err_clk_register;
+
+		ret = pll_set_rate(pll, rate_index, parent_rate);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+	}
+
+	clk = clk_register(NULL, &pll->hw);
+	if (WARN_ON(IS_ERR(clk)))
+		goto err_clk_register;
+
+	pll->clk_data.clk_num = 1;
+	pll->clk_data.clks = &clk;
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get,
+			&pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_add;
+
+	return;
+
+err_clk_add:
+	clk_unregister(clk);
+err_clk_register:
+	if (pll->asiu_base)
+		iounmap(pll->asiu_base);
+err_asiu_iomap:
+	iounmap(pll->pwr_base);
+err_pwr_iomap:
+	iounmap(pll->pll_base);
+err_pll_iomap:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc.h b/drivers/clk/bcm/clk-iproc.h
new file mode 100644
index 0000000..4aa0479
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc.h
@@ -0,0 +1,155 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _CLK_IPROC_H
+#define _CLK_IPROC_H
+
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/of.h>
+#include <linux/clk-provider.h>
+
+#define IPROC_CLK_NAME_LEN 25
+#define IPROC_CLK_INVALID_OFFSET 0xffffffff
+#define bit_mask(width) ((1 << (width)) - 1)
+
+/* clock should not be disabled at runtime */
+#define IPROC_CLK_AON BIT(0)
+
+/* PLL requires gating through ASIU */
+#define IPROC_CLK_PLL_ASIU BIT(1)
+
+/* PLL has fractional part of the NDIV */
+#define IPROC_CLK_PLL_HAS_NDIV_FRAC BIT(2)
+
+/*
+ * Parameters for VCO frequency configuration
+ *
+ * VCO frequency =
+ * ((ndiv_int + ndiv_frac / 2^20) * (ref freqeuncy  / pdiv)
+ */
+struct iproc_pll_vco_freq_param {
+	unsigned long rate;
+	unsigned int ndiv_int;
+	unsigned int ndiv_frac;
+	unsigned int pdiv;
+};
+
+struct iproc_clk_reg_op {
+	unsigned int offset;
+	unsigned int shift;
+	unsigned int width;
+};
+
+/*
+ * Clock gating control at the top ASIU level
+ */
+struct iproc_asiu_gate {
+	unsigned int offset;
+	unsigned int en_shift;
+};
+
+/*
+ * Control of powering on/off of a PLL
+ *
+ * Before powering off a PLL, input isolation (ISO) needs to be enabled
+ */
+struct iproc_pll_aon_pwr_ctrl {
+	unsigned int offset;
+	unsigned int pwr_width;
+	unsigned int pwr_shift;
+	unsigned int iso_shift;
+};
+
+/*
+ * Control of the PLL reset, with Ki, Kp, and Ka parameters
+ */
+struct iproc_pll_reset_ctrl {
+	unsigned int offset;
+	unsigned int reset_shift;
+	unsigned int p_reset_shift;
+	unsigned int ki_shift;
+	unsigned int ki_width;
+	unsigned int kp_shift;
+	unsigned int kp_width;
+	unsigned int ka_shift;
+	unsigned int ka_width;
+};
+
+struct iproc_pll_vco_ctrl {
+	unsigned int u_offset;
+	unsigned int l_offset;
+};
+
+/*
+ * Main PLL control parameters
+ */
+struct iproc_pll_ctrl {
+	unsigned long flags;
+	struct iproc_pll_aon_pwr_ctrl aon;
+	struct iproc_asiu_gate asiu;
+	struct iproc_pll_reset_ctrl reset;
+	struct iproc_clk_reg_op ndiv_int;
+	struct iproc_clk_reg_op ndiv_frac;
+	struct iproc_clk_reg_op pdiv;
+	struct iproc_pll_vco_ctrl vco_ctrl;
+	struct iproc_clk_reg_op status;
+};
+
+/*
+ * Controls enabling/disabling a PLL derived clock
+ */
+struct iproc_clk_enable_ctrl {
+	unsigned int offset;
+	unsigned int enable_shift;
+	unsigned int hold_shift;
+	unsigned int bypass_shift;
+};
+
+/*
+ * Main clock control parameters for clocks derived from the PLLs
+ */
+struct iproc_clk_ctrl {
+	unsigned int channel;
+	unsigned long flags;
+	struct iproc_clk_enable_ctrl enable;
+	struct iproc_clk_reg_op mdiv;
+};
+
+/*
+ * Divisor of the ASIU clocks
+ */
+struct iproc_asiu_div {
+	unsigned int offset;
+	unsigned int en_shift;
+	unsigned int high_shift;
+	unsigned int high_width;
+	unsigned int low_shift;
+	unsigned int low_width;
+};
+
+extern void __init iproc_armpll_setup(struct device_node *node);
+extern void __init iproc_pll_setup(struct device_node *node,
+		const struct iproc_pll_ctrl *ctrl,
+		const struct iproc_pll_vco_freq_param *vco_param,
+		unsigned int num_freqs);
+extern void __init iproc_clk_setup(struct device_node *node,
+		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks);
+extern void __init iproc_asiu_setup(struct device_node *node,
+		const struct iproc_asiu_div *div,
+		const struct iproc_asiu_gate *gate, unsigned int num_clks);
+
+#endif /* _CLK_IPROC_H */
-- 
1.7.9.5

[PATCH v2 2/5] clk: iproc: add initial common clock support

[Ray Jui]

This adds basic and generic support for various iProc PLLs and clocks
including the ARMPLL, GENPLL, LCPLL, MIPIPLL, and ASIU clocks.

SoCs under the iProc architecture can define their specific register
offsets and clock parameters for their PLL and clock controllers. These
parameters can be passed as arugments into the generic iProc PLL and
clock setup functions

Derived from code originally provided by Jonathan Richardson
<jonathar@broadcom.com>

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/clk/bcm/Kconfig            |    9 +
 drivers/clk/bcm/Makefile           |    1 +
 drivers/clk/bcm/clk-iproc-armpll.c |  286 +++++++++++++++++++++
 drivers/clk/bcm/clk-iproc-asiu.c   |  275 ++++++++++++++++++++
 drivers/clk/bcm/clk-iproc-clk.c    |  238 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-pll.c    |  483 ++++++++++++++++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc.h        |  155 ++++++++++++
 7 files changed, 1447 insertions(+)
 create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
 create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
 create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
 create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
 create mode 100644 drivers/clk/bcm/clk-iproc.h

diff --git a/drivers/clk/bcm/Kconfig b/drivers/clk/bcm/Kconfig
index 75506e5..66b5b7f 100644
--- a/drivers/clk/bcm/Kconfig
+++ b/drivers/clk/bcm/Kconfig
@@ -7,3 +7,12 @@ config CLK_BCM_KONA
 	  Enable common clock framework support for Broadcom SoCs
 	  using "Kona" style clock control units, including those
 	  in the BCM281xx and BCM21664 families.
+
+config COMMON_CLK_IPROC
+	bool "Broadcom iProc clock support"
+	depends on ARCH_BCM_IPROC
+	depends on COMMON_CLK
+	default y
+	help
+	  Enable common clock framework support for Broadcom SoCs
+	  based on the "iProc" architecture
diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
index 6297d05..6926636 100644
--- a/drivers/clk/bcm/Makefile
+++ b/drivers/clk/bcm/Makefile
@@ -2,3 +2,4 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
+obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
diff --git a/drivers/clk/bcm/clk-iproc-armpll.c b/drivers/clk/bcm/clk-iproc-armpll.c
new file mode 100644
index 0000000..ec9b130
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-armpll.c
@@ -0,0 +1,286 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+
+#define IPROC_CLK_MAX_FREQ_POLICY                    0x3
+#define IPROC_CLK_POLICY_FREQ_OFFSET                 0x008
+#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT      8
+#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK       0x7
+
+#define IPROC_CLK_PLLARMA_OFFSET                     0xc00
+#define IPROC_CLK_PLLARMA_LOCK_SHIFT                 28
+#define IPROC_CLK_PLLARMA_PDIV_SHIFT                 24
+#define IPROC_CLK_PLLARMA_PDIV_MASK                  0xf
+#define IPROC_CLK_PLLARMA_NDIV_INT_SHIFT             8
+#define IPROC_CLK_PLLARMA_NDIV_INT_MASK              0x3ff
+
+#define IPROC_CLK_PLLARMB_OFFSET                     0xc04
+#define IPROC_CLK_PLLARMB_NDIV_FRAC_MASK             0xfffff
+
+#define IPROC_CLK_PLLARMC_OFFSET                     0xc08
+#define IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT            8
+#define IPROC_CLK_PLLARMC_MDIV_MASK                  0xff
+
+#define IPROC_CLK_PLLARMCTL5_OFFSET                  0xc20
+#define IPROC_CLK_PLLARMCTL5_H_MDIV_MASK             0xff
+
+#define IPROC_CLK_PLLARM_OFFSET_OFFSET               0xc24
+#define IPROC_CLK_PLLARM_SW_CTL_SHIFT                29
+#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT       20
+#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK        0xff
+#define IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK       0xfffff
+
+#define IPROC_CLK_ARM_DIV_OFFSET                     0xe00
+#define IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT  4
+#define IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK        0xf
+
+#define IPROC_CLK_POLICY_DBG_OFFSET                  0xec0
+#define IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT          12
+#define IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK           0x7
+
+enum iproc_arm_pll_fid {
+	ARM_PLL_FID_CRYSTAL_CLK   = 0,
+	ARM_PLL_FID_SYS_CLK       = 2,
+	ARM_PLL_FID_CH0_SLOW_CLK  = 6,
+	ARM_PLL_FID_CH1_FAST_CLK  = 7
+};
+
+struct iproc_arm_pll {
+	struct clk_hw hw;
+	void __iomem *base;
+	struct clk_onecell_data clk_data;
+	unsigned long rate;
+};
+
+#define to_iproc_arm_pll(hw) container_of(hw, struct iproc_arm_pll, hw)
+
+static unsigned int __get_fid(struct iproc_arm_pll *pll)
+{
+	u32 val;
+	unsigned int policy, fid, active_fid;
+
+	val = readl(pll->base + IPROC_CLK_ARM_DIV_OFFSET);
+	if (val & (1 << IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT))
+		policy = val & IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK;
+	else
+		policy = 0;
+
+	/* something is seriously wrong */
+	BUG_ON(policy > IPROC_CLK_MAX_FREQ_POLICY);
+
+	val = readl(pll->base + IPROC_CLK_POLICY_FREQ_OFFSET);
+	fid = (val >> (IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT * policy)) &
+		IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK;
+
+	val = readl(pll->base + IPROC_CLK_POLICY_DBG_OFFSET);
+	active_fid = IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK &
+		(val >> IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT);
+	if (fid != active_fid) {
+		pr_debug("%s: fid override %u->%u\n", __func__,	fid,
+				active_fid);
+		fid = active_fid;
+	}
+
+	pr_debug("%s: active fid: %u\n", __func__, fid);
+
+	return fid;
+}
+
+/*
+ * Determine the mdiv (post divider) based on the frequency ID being used.
+ * There are 4 sources that can be used to derive the output clock rate:
+ *    - 25 MHz Crystal
+ *    - System clock
+ *    - PLL channel 0 (slow clock)
+ *    - PLL channel 1 (fast clock)
+ */
+static int __get_mdiv(struct iproc_arm_pll *pll)
+{
+	unsigned int fid;
+	int mdiv;
+	u32 val;
+
+	fid = __get_fid(pll);
+
+	switch (fid) {
+	case ARM_PLL_FID_CRYSTAL_CLK:
+	case ARM_PLL_FID_SYS_CLK:
+		mdiv = 1;
+		break;
+
+	case ARM_PLL_FID_CH0_SLOW_CLK:
+		val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
+		mdiv = val & IPROC_CLK_PLLARMC_MDIV_MASK;
+		if (mdiv == 0)
+			mdiv = 256;
+		break;
+
+	case ARM_PLL_FID_CH1_FAST_CLK:
+		val = readl(pll->base +	IPROC_CLK_PLLARMCTL5_OFFSET);
+		mdiv = val & IPROC_CLK_PLLARMCTL5_H_MDIV_MASK;
+		if (mdiv == 0)
+			mdiv = 256;
+		break;
+
+	default:
+		mdiv = -EFAULT;
+	}
+
+	return mdiv;
+}
+
+static unsigned int __get_ndiv(struct iproc_arm_pll *pll)
+{
+	u32 val;
+	unsigned int ndiv_int, ndiv_frac, ndiv;
+
+	val = readl(pll->base + IPROC_CLK_PLLARM_OFFSET_OFFSET);
+	if (val & (1 << IPROC_CLK_PLLARM_SW_CTL_SHIFT)) {
+		/*
+		 * offset mode is active. Read the ndiv from the PLLARM OFFSET
+		 * register
+		 */
+		ndiv_int = (val >> IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT) &
+			IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK;
+		if (ndiv_int == 0)
+			ndiv_int = 256;
+
+		ndiv_frac = val & IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK;
+	} else {
+		/* offset mode not active */
+		val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
+		ndiv_int = (val >> IPROC_CLK_PLLARMA_NDIV_INT_SHIFT) &
+			IPROC_CLK_PLLARMA_NDIV_INT_MASK;
+		if (ndiv_int == 0)
+			ndiv_int = 1024;
+
+		val = readl(pll->base + IPROC_CLK_PLLARMB_OFFSET);
+		ndiv_frac = val & IPROC_CLK_PLLARMB_NDIV_FRAC_MASK;
+	}
+
+	ndiv = (ndiv_int << 20) | ndiv_frac;
+
+	return ndiv;
+}
+
+/*
+ * The output frequency of the ARM PLL is calculated based on the ARM PLL
+ * divider values:
+ *   pdiv = ARM PLL pre-divider
+ *   ndiv = ARM PLL multiplier
+ *   mdiv = ARM PLL post divider
+ *
+ * The frequency is calculated by:
+ *   ((ndiv * parent clock rate) / pdiv) / mdiv
+ */
+static unsigned long iproc_arm_pll_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_arm_pll *pll = to_iproc_arm_pll(hw);
+	u32 val;
+	int mdiv;
+	u64 ndiv;
+	unsigned int pdiv;
+
+	/* in bypass mode, use parent rate */
+	val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
+	if (val & (1 << IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT)) {
+		pll->rate = parent_rate;
+		return pll->rate;
+	}
+
+	/* PLL needs to be locked */
+	val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
+	if (!(val & (1 << IPROC_CLK_PLLARMA_LOCK_SHIFT))) {
+		pll->rate = 0;
+		return 0;
+	}
+
+	pdiv = (val >> IPROC_CLK_PLLARMA_PDIV_SHIFT) &
+		IPROC_CLK_PLLARMA_PDIV_MASK;
+	if (pdiv == 0)
+		pdiv = 16;
+
+	ndiv = __get_ndiv(pll);
+	mdiv = __get_mdiv(pll);
+	if (mdiv <= 0) {
+		pll->rate = 0;
+		return 0;
+	}
+	pll->rate = (ndiv * parent_rate) >> 20;
+	pll->rate = (pll->rate / pdiv) / mdiv;
+
+	pr_debug("%s: ARM PLL rate: %lu. parent rate: %lu\n", __func__,
+			pll->rate, parent_rate);
+	pr_debug("%s: ndiv_int: %u, pdiv: %u, mdiv: %d\n", __func__,
+			(unsigned int)(ndiv >> 20), pdiv, mdiv);
+
+	return pll->rate;
+}
+
+static const struct clk_ops iproc_arm_pll_ops = {
+	.recalc_rate = iproc_arm_pll_recalc_rate,
+};
+
+void __init iproc_armpll_setup(struct device_node *node)
+{
+	int ret;
+	struct clk *clk;
+	struct iproc_arm_pll *pll;
+	struct clk_init_data init;
+	const char *parent_name;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->base = of_iomap(node, 0);
+	if (WARN_ON(!pll->base))
+		goto err_free_pll;
+
+	init.name = node->name;
+	init.ops = &iproc_arm_pll_ops;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	pll->hw.init = &init;
+
+	clk = clk_register(NULL, &pll->hw);
+	if (WARN_ON(IS_ERR(clk)))
+		goto err_iounmap;
+
+	pll->clk_data.clk_num = 1;
+	pll->clk_data.clks = &clk;
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_unregister;
+
+	return;
+
+err_clk_unregister:
+	clk_unregister(clk);
+err_iounmap:
+	iounmap(pll->base);
+err_free_pll:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc-asiu.c b/drivers/clk/bcm/clk-iproc-asiu.c
new file mode 100644
index 0000000..ab86b8c
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-asiu.c
@@ -0,0 +1,275 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+struct iproc_asiu;
+
+struct iproc_asiu_clk {
+	struct clk_hw hw;
+	const char *name;
+	struct iproc_asiu *asiu;
+	unsigned long rate;
+	struct iproc_asiu_div div;
+	struct iproc_asiu_gate gate;
+};
+
+struct iproc_asiu {
+	void __iomem *div_base;
+	void __iomem *gate_base;
+
+	struct clk_onecell_data clk_data;
+	struct iproc_asiu_clk *clks;
+};
+
+#define to_asiu_clk(hw) container_of(hw, struct iproc_asiu_clk, hw)
+
+static int iproc_asiu_clk_enable(struct clk_hw *hw)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+
+	/* some clocks at the ASIU level are always enabled */
+	if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
+		return 0;
+
+	val = readl(asiu->gate_base + clk->gate.offset);
+	val |= (1 << clk->gate.en_shift);
+	writel(val, asiu->gate_base + clk->gate.offset);
+
+	return 0;
+}
+
+static void iproc_asiu_clk_disable(struct clk_hw *hw)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+
+	/* some clocks at the ASIU level are always enabled */
+	if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
+		return;
+
+	val = readl(asiu->gate_base + clk->gate.offset);
+	val &= ~(1 << clk->gate.en_shift);
+	writel(val, asiu->gate_base + clk->gate.offset);
+}
+
+static unsigned long iproc_asiu_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+	unsigned int div_h, div_l;
+
+	if (parent_rate == 0) {
+		clk->rate = 0;
+		return 0;
+	}
+
+	/* if clock divisor is not enabled, simply return parent rate */
+	val = readl(asiu->div_base + clk->div.offset);
+	if ((val & (1 << clk->div.en_shift)) == 0) {
+		clk->rate = parent_rate;
+		return parent_rate;
+	}
+
+	/* clock rate = parent rate / (high_div + 1) + (low_div + 1) */
+	div_h = (val >> clk->div.high_shift) & bit_mask(clk->div.high_width);
+	div_h++;
+	div_l = (val >> clk->div.low_shift) & bit_mask(clk->div.low_width);
+	div_l++;
+
+	clk->rate = parent_rate / (div_h + div_l);
+	pr_debug("%s: rate: %lu. parent rate: %lu div_h: %u div_l: %u\n",
+		__func__, clk->rate, parent_rate, div_h, div_l);
+
+	return clk->rate;
+}
+
+static long iproc_asiu_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	unsigned int div;
+
+	if (rate == 0 || *parent_rate == 0)
+		return -EINVAL;
+
+	if (rate == *parent_rate)
+		return *parent_rate;
+
+	div = DIV_ROUND_UP(*parent_rate, rate);
+	if (div < 2)
+		return *parent_rate;
+
+	return *parent_rate / div;
+}
+
+static int iproc_asiu_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	unsigned int div, div_h, div_l;
+	u32 val;
+
+	if (rate == 0 || parent_rate == 0)
+		return -EINVAL;
+
+	/* simply disable the divisor if one wants the same rate as parent */
+	if (rate == parent_rate) {
+		val = readl(asiu->div_base + clk->div.offset);
+		val &= ~(1 << clk->div.en_shift);
+		writel(val, asiu->div_base + clk->div.offset);
+		return 0;
+	}
+
+	div = DIV_ROUND_UP(parent_rate, rate);
+	if (div < 2)
+		return -EINVAL;
+
+	div_h = div_l = div >> 1;
+	div_h--;
+	div_l--;
+
+	val = readl(asiu->div_base + clk->div.offset);
+	val |= 1 << clk->div.en_shift;
+	if (div_h) {
+		val &= ~(bit_mask(clk->div.high_width)
+				<< clk->div.high_shift);
+		val |= div_h << clk->div.high_shift;
+	} else {
+		val &= ~(bit_mask(clk->div.high_width)
+				<< clk->div.high_shift);
+	}
+	if (div_l) {
+		val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
+		val |= div_l << clk->div.low_shift;
+	} else {
+		val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
+	}
+	writel(val, asiu->div_base + clk->div.offset);
+
+	return 0;
+}
+
+static const struct clk_ops iproc_asiu_ops = {
+	.enable = iproc_asiu_clk_enable,
+	.disable = iproc_asiu_clk_disable,
+	.recalc_rate = iproc_asiu_clk_recalc_rate,
+	.round_rate = iproc_asiu_clk_round_rate,
+	.set_rate = iproc_asiu_clk_set_rate,
+};
+
+void __init iproc_asiu_setup(struct device_node *node,
+		const struct iproc_asiu_div *div,
+		const struct iproc_asiu_gate *gate, unsigned int num_clks)
+{
+	int i, ret;
+	struct iproc_asiu *asiu;
+
+	if (WARN_ON(!gate || !div))
+		return;
+
+	asiu = kzalloc(sizeof(*asiu), GFP_KERNEL);
+	if (WARN_ON(!asiu))
+		return;
+
+	asiu->clk_data.clk_num = num_clks;
+	asiu->clk_data.clks = kcalloc(num_clks, sizeof(*asiu->clk_data.clks),
+			GFP_KERNEL);
+	if (WARN_ON(!asiu->clk_data.clks))
+		goto err_clks;
+
+	asiu->clks = kcalloc(num_clks, sizeof(*asiu->clks), GFP_KERNEL);
+	if (WARN_ON(!asiu->clks))
+		goto err_asiu_clks;
+
+	asiu->div_base = of_iomap(node, 0);
+	if (WARN_ON(!asiu->div_base))
+		goto err_iomap_div;
+
+	asiu->gate_base = of_iomap(node, 1);
+	if (WARN_ON(!asiu->gate_base))
+		goto err_iomap_gate;
+
+	for (i = 0; i < num_clks; i++) {
+		struct clk_init_data init;
+		struct clk *clk;
+		const char *parent_name;
+		struct iproc_asiu_clk *asiu_clk;
+		const char *clk_name;
+
+		clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
+		if (WARN_ON(!clk_name))
+			goto err_clk_register;
+
+		ret = of_property_read_string_index(node, "clock-output-names",
+				i, &clk_name);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+
+		asiu_clk = &asiu->clks[i];
+		asiu_clk->name = clk_name;
+		asiu_clk->asiu = asiu;
+		asiu_clk->div = div[i];
+		asiu_clk->gate = gate[i];
+		init.name = clk_name;
+		init.ops = &iproc_asiu_ops;
+		init.flags = 0;
+		parent_name = of_clk_get_parent_name(node, 0);
+		init.parent_names = (parent_name ? &parent_name : NULL);
+		init.num_parents = (parent_name ? 1 : 0);
+		asiu_clk->hw.init = &init;
+
+		clk = clk_register(NULL, &asiu_clk->hw);
+		if (WARN_ON(IS_ERR(clk)))
+			goto err_clk_register;
+		asiu->clk_data.clks[i] = clk;
+	}
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get,
+			&asiu->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_register;
+
+	return;
+
+err_clk_register:
+	for (i = 0; i < num_clks; i++)
+		kfree(asiu->clks[i].name);
+	iounmap(asiu->gate_base);
+
+err_iomap_gate:
+	iounmap(asiu->div_base);
+
+err_iomap_div:
+	kfree(asiu->clks);
+
+err_asiu_clks:
+	kfree(asiu->clk_data.clks);
+
+err_clks:
+	kfree(asiu);
+}
diff --git a/drivers/clk/bcm/clk-iproc-clk.c b/drivers/clk/bcm/clk-iproc-clk.c
new file mode 100644
index 0000000..be3c42c
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-clk.c
@@ -0,0 +1,238 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+struct iproc_pll;
+
+struct iproc_clk {
+	struct clk_hw hw;
+	const char *name;
+	struct iproc_pll *pll;
+	unsigned long rate;
+	const struct iproc_clk_ctrl *ctrl;
+};
+
+struct iproc_pll {
+	void __iomem *base;
+	struct clk_onecell_data clk_data;
+	struct iproc_clk *clks;
+};
+
+#define to_iproc_clk(hw) container_of(hw, struct iproc_clk, hw)
+
+static int iproc_clk_enable(struct clk_hw *hw)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+
+	/* channel enable is active low */
+	val = readl(pll->base + ctrl->enable.offset);
+	val &= ~(1 << ctrl->enable.enable_shift);
+	writel(val, pll->base + ctrl->enable.offset);
+
+	/* also make sure channel is not held */
+	val = readl(pll->base + ctrl->enable.offset);
+	val &= ~(1 << ctrl->enable.hold_shift);
+	writel(val, pll->base + ctrl->enable.offset);
+
+	return 0;
+}
+
+static void iproc_clk_disable(struct clk_hw *hw)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+
+	if (ctrl->flags & IPROC_CLK_AON)
+		return;
+
+	val = readl(pll->base + ctrl->enable.offset);
+	val |= 1 << ctrl->enable.enable_shift;
+	writel(val, pll->base + ctrl->enable.offset);
+}
+
+static unsigned long iproc_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+	unsigned int mdiv;
+
+	if (parent_rate == 0)
+		return 0;
+
+	val = readl(pll->base + ctrl->mdiv.offset);
+	mdiv = (val >> ctrl->mdiv.shift) & bit_mask(ctrl->mdiv.width);
+	if (mdiv == 0)
+		mdiv = 256;
+
+	clk->rate = parent_rate / mdiv;
+
+	return clk->rate;
+}
+
+static long iproc_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	unsigned int div;
+
+	if (rate == 0 || *parent_rate == 0)
+		return -EINVAL;
+
+	if (rate == *parent_rate)
+		return *parent_rate;
+
+	div = DIV_ROUND_UP(*parent_rate, rate);
+	if (div < 2)
+		return *parent_rate;
+
+	if (div > 256)
+		div = 256;
+
+	return *parent_rate / div;
+}
+
+static int iproc_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+	unsigned int div;
+
+	if (rate == 0 || parent_rate == 0)
+		return -EINVAL;
+
+	div = DIV_ROUND_UP(parent_rate, rate);
+	if (div > 256)
+		return -EINVAL;
+
+	val = readl(pll->base + ctrl->mdiv.offset);
+	if (div == 256) {
+		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
+	} else {
+		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
+		val |= div << ctrl->mdiv.shift;
+	}
+	writel(val, pll->base + ctrl->mdiv.offset);
+	clk->rate = parent_rate / div;
+
+	return 0;
+}
+
+static const struct clk_ops iproc_clk_ops = {
+	.enable = iproc_clk_enable,
+	.disable = iproc_clk_disable,
+	.recalc_rate = iproc_clk_recalc_rate,
+	.round_rate = iproc_clk_round_rate,
+	.set_rate = iproc_clk_set_rate,
+};
+
+void __init iproc_clk_setup(struct device_node *node,
+		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks)
+{
+	int i, ret;
+	struct iproc_pll *pll;
+
+	if (WARN_ON(!ctrl))
+		return;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->clk_data.clk_num = num_clks;
+	pll->clk_data.clks = kcalloc(num_clks, sizeof(*pll->clk_data.clks),
+			GFP_KERNEL);
+	if (WARN_ON(!pll->clk_data.clks))
+		goto err_clks;
+
+	pll->clks = kcalloc(num_clks, sizeof(*pll->clks), GFP_KERNEL);
+	if (WARN_ON(!pll->clks))
+		goto err_pll_clks;
+
+	pll->base = of_iomap(node, 0);
+	if (WARN_ON(!pll->base))
+		goto err_iomap;
+
+	for (i = 0; i < num_clks; i++) {
+		struct clk_init_data init;
+		struct clk *clk;
+		const char *parent_name;
+		struct iproc_clk *iclk;
+		const char *clk_name;
+
+		clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
+		if (WARN_ON(!clk_name))
+			goto err_clk_register;
+
+		ret = of_property_read_string_index(node, "clock-output-names",
+				i, &clk_name);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+
+		iclk = &pll->clks[i];
+		iclk->name = clk_name;
+		iclk->pll = pll;
+		iclk->ctrl = &ctrl[i];
+		init.name = clk_name;
+		init.ops = &iproc_clk_ops;
+		init.flags = 0;
+		parent_name = of_clk_get_parent_name(node, 0);
+		init.parent_names = (parent_name ? &parent_name : NULL);
+		init.num_parents = (parent_name ? 1 : 0);
+		iclk->hw.init = &init;
+
+		clk = clk_register(NULL, &iclk->hw);
+		if (WARN_ON(IS_ERR(clk)))
+			goto err_clk_register;
+		pll->clk_data.clks[i] = clk;
+	}
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_register;
+
+	return;
+
+err_clk_register:
+	for (i = 0; i < num_clks; i++)
+		kfree(pll->clks[i].name);
+	iounmap(pll->base);
+
+err_iomap:
+	kfree(pll->clks);
+
+err_pll_clks:
+	kfree(pll->clk_data.clks);
+
+err_clks:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc-pll.c b/drivers/clk/bcm/clk-iproc-pll.c
new file mode 100644
index 0000000..cd3bd38
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-pll.c
@@ -0,0 +1,483 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+#define PLL_VCO_HIGH_SHIFT 19
+#define PLL_VCO_LOW_SHIFT  30
+
+/* number of delay loops waiting for PLL to lock */
+#define LOCK_DELAY 100
+
+/* number of VCO frequency bands */
+#define NUM_FREQ_BANDS 8
+
+#define NUM_KP_BANDS 3
+enum kp_band {
+	KP_BAND_MID = 0,
+	KP_BAND_HIGH,
+	KP_BAND_HIGH_HIGH
+};
+
+static const unsigned int kp_table[NUM_KP_BANDS][NUM_FREQ_BANDS] = {
+	{ 5, 6, 6, 7, 7, 8, 9, 10 },
+	{ 4, 4, 5, 5, 6, 7, 8, 9  },
+	{ 4, 5, 5, 6, 7, 8, 9, 10 },
+};
+
+static const unsigned long ref_freq_table[NUM_FREQ_BANDS][2] = {
+	{ 10000000,  12500000  },
+	{ 12500000,  15000000  },
+	{ 15000000,  20000000  },
+	{ 20000000,  25000000  },
+	{ 25000000,  50000000  },
+	{ 50000000,  75000000  },
+	{ 75000000,  100000000 },
+	{ 100000000, 125000000 },
+};
+
+enum vco_freq_range {
+	VCO_LOW       = 700000000U,
+	VCO_MID       = 1200000000U,
+	VCO_HIGH      = 2200000000U,
+	VCO_HIGH_HIGH = 3100000000U,
+	VCO_MAX       = 4000000000U,
+};
+
+struct iproc_pll {
+	struct clk_hw hw;
+	void __iomem *pll_base;
+	void __iomem *pwr_base;
+	void __iomem *asiu_base;
+	struct clk_onecell_data clk_data;
+	const char *name;
+	const struct iproc_pll_ctrl *ctrl;
+	const struct iproc_pll_vco_freq_param *vco_param;
+	unsigned int num_vco_entries;
+	unsigned long rate;
+};
+
+#define to_iproc_pll(hw) container_of(hw, struct iproc_pll, hw)
+
+/*
+ * Get the clock rate based on name
+ */
+static unsigned long __get_rate(const char *clk_name)
+{
+	struct clk *clk;
+
+	clk = __clk_lookup(clk_name);
+	if (!clk) {
+		pr_err("%s: unable to find clock by name: %s\n", __func__,
+				clk_name);
+		return 0;
+	}
+
+	return clk_get_rate(clk);
+}
+
+/*
+ * Based on the target frequency, find a match from the VCO frequency parameter
+ * table and return its index
+ */
+static int pll_get_rate_index(struct iproc_pll *pll, unsigned int target_rate)
+{
+	int i;
+
+	for (i = 0; i < pll->num_vco_entries; i++)
+		if (target_rate == pll->vco_param[i].rate)
+			break;
+
+	if (i >= pll->num_vco_entries)
+		return -EINVAL;
+
+	return i;
+}
+
+static int get_kp(unsigned long ref_freq, enum kp_band kp_index)
+{
+	int i;
+
+	if (ref_freq < ref_freq_table[0][0])
+		return -EINVAL;
+
+	for (i = 0; i < NUM_FREQ_BANDS; i++) {
+		if (ref_freq >= ref_freq_table[i][0] &&
+			ref_freq < ref_freq_table[i][1])
+			return kp_table[kp_index][i];
+	}
+	return -EINVAL;
+}
+
+static int pll_wait_for_lock(struct iproc_pll *pll)
+{
+	int i;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+
+	for (i = 0; i < LOCK_DELAY; i++) {
+		u32 val = readl(pll->pll_base + ctrl->status.offset);
+
+		if (val & (1 << ctrl->status.shift))
+			return 0;
+		udelay(10);
+	}
+
+	return -EIO;
+}
+
+static void __pll_disable(struct iproc_pll *pll)
+{
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		val = readl(pll->asiu_base + ctrl->asiu.offset);
+		val &= ~(1 << ctrl->asiu.en_shift);
+		writel(val, pll->asiu_base + ctrl->asiu.offset);
+	}
+
+	/* latch input value so core power can be shut down */
+	val = readl(pll->pwr_base + ctrl->aon.offset);
+	val |= (1 << ctrl->aon.iso_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+
+	/* power down the core */
+	val &= ~(bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+}
+
+static int __pll_enable(struct iproc_pll *pll)
+{
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+
+	/* power up the PLL and make sure it's not latched */
+	val = readl(pll->pwr_base + ctrl->aon.offset);
+	val |= bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift;
+	val &= ~(1 << ctrl->aon.iso_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+
+	/* certain PLLs also need to be ungated from the ASIU top level */
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		val = readl(pll->asiu_base + ctrl->asiu.offset);
+		val |= (1 << ctrl->asiu.en_shift);
+		writel(val, pll->asiu_base + ctrl->asiu.offset);
+	}
+
+	return 0;
+}
+
+static void __pll_put_in_reset(struct iproc_pll *pll)
+{
+	u32 val;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
+
+	val = readl(pll->pll_base + reset->offset);
+	val &= ~(1 << reset->reset_shift | 1 << reset->p_reset_shift);
+	writel(val, pll->pll_base + reset->offset);
+}
+
+static void __pll_bring_out_reset(struct iproc_pll *pll, unsigned int kp,
+		unsigned int ka, unsigned int ki)
+{
+	u32 val;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
+
+	val = readl(pll->pll_base + reset->offset);
+	val &= ~(bit_mask(reset->ki_width) << reset->ki_shift |
+		bit_mask(reset->kp_width) << reset->kp_shift |
+		bit_mask(reset->ka_width) << reset->ka_shift);
+	val |=  ki << reset->ki_shift | kp << reset->kp_shift |
+		ka << reset->ka_shift;
+	val |= 1 << reset->reset_shift | 1 << reset->p_reset_shift;
+	writel(val, pll->pll_base + reset->offset);
+}
+
+static int pll_set_rate(struct iproc_pll *pll, unsigned int rate_index,
+		unsigned long parent_rate)
+{
+	const struct iproc_pll_vco_freq_param *vco =
+				&pll->vco_param[rate_index];
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	int ka = 0, ki, kp, ret;
+	unsigned long rate = vco->rate;
+	u32 val;
+	enum kp_band kp_index;
+	unsigned long ref_freq;
+
+	/*
+	 * reference frequency = parent frequency / PDIV
+	 * If PDIV = 0, then it becomes a multiplier (x2)
+	 */
+	if (vco->pdiv == 0)
+		ref_freq = parent_rate * 2;
+	else
+		ref_freq = parent_rate / vco->pdiv;
+
+	/* determine Ki and Kp index based on target VCO frequency */
+	if (rate >= VCO_LOW && rate < VCO_HIGH) {
+		ki = 4;
+		kp_index = KP_BAND_MID;
+	} else if (rate >= VCO_HIGH && rate && rate < VCO_HIGH_HIGH) {
+		ki = 3;
+		kp_index = KP_BAND_HIGH;
+	} else if (rate >= VCO_HIGH_HIGH && rate < VCO_MAX) {
+		ki = 3;
+		kp_index = KP_BAND_HIGH_HIGH;
+	} else {
+		pr_err("%s: pll: %s has invalid rate: %lu\n", __func__,
+				pll->name, rate);
+		return -EINVAL;
+	}
+
+	kp = get_kp(ref_freq, kp_index);
+	if (kp < 0) {
+		pr_err("%s: pll: %s has invalid kp\n", __func__, pll->name);
+		return kp;
+	}
+
+	ret = __pll_enable(pll);
+	if (ret) {
+		pr_err("%s: pll: %s fails to enable\n", __func__, pll->name);
+		return ret;
+	}
+
+	/* put PLL in reset */
+	__pll_put_in_reset(pll);
+
+	writel(0, pll->pll_base + ctrl->vco_ctrl.u_offset);
+	val = readl(pll->pll_base + ctrl->vco_ctrl.l_offset);
+
+	if (rate >= VCO_LOW && rate < VCO_MID)
+		val |= (1 << PLL_VCO_LOW_SHIFT);
+
+	if (rate < VCO_HIGH)
+		val &= ~(1 << PLL_VCO_HIGH_SHIFT);
+	else
+		val |= (1 << PLL_VCO_HIGH_SHIFT);
+
+	writel(val, pll->pll_base + ctrl->vco_ctrl.l_offset);
+
+	/* program integer part of NDIV */
+	val = readl(pll->pll_base + ctrl->ndiv_int.offset);
+	val &= ~(bit_mask(ctrl->ndiv_int.width) << ctrl->ndiv_int.shift);
+	val |= vco->ndiv_int << ctrl->ndiv_int.shift;
+	writel(val, pll->pll_base + ctrl->ndiv_int.offset);
+
+	/* program fractional part of NDIV */
+	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
+		val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
+		val &= ~(bit_mask(ctrl->ndiv_frac.width) <<
+				ctrl->ndiv_frac.shift);
+		val |= vco->ndiv_frac << ctrl->ndiv_frac.shift;
+		writel(val, pll->pll_base + ctrl->ndiv_frac.offset);
+	}
+
+	/* program PDIV */
+	val = readl(pll->pll_base + ctrl->pdiv.offset);
+	val &= ~(bit_mask(ctrl->pdiv.width) << ctrl->pdiv.shift);
+	val |= vco->pdiv << ctrl->pdiv.shift;
+	writel(val, pll->pll_base + ctrl->pdiv.offset);
+
+	__pll_bring_out_reset(pll, kp, ka, ki);
+
+	ret = pll_wait_for_lock(pll);
+	if (ret < 0) {
+		pr_err("%s: pll: %s failed to lock\n", __func__, pll->name);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int iproc_pll_enable(struct clk_hw *hw)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+
+	return __pll_enable(pll);
+}
+
+static void iproc_pll_disable(struct clk_hw *hw)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+
+	if (ctrl->flags & IPROC_CLK_AON)
+		return;
+
+	__pll_disable(pll);
+}
+
+static unsigned long iproc_pll_recalc_rate(struct clk_hw *hw,
+	unsigned long parent_rate)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+	u64 ndiv;
+	unsigned int ndiv_int, ndiv_frac, pdiv;
+
+	if (parent_rate == 0)
+		return 0;
+
+	/* PLL needs to be locked */
+	val = readl(pll->pll_base + ctrl->status.offset);
+	if ((val & (1 << ctrl->status.shift)) == 0) {
+		pll->rate = 0;
+		return 0;
+	}
+
+	/*
+	 * PLL output frequency =
+	 *
+	 * ((ndiv_int + ndiv_frac / 2^20) * (parent clock rate / pdiv)
+	 */
+	val = readl(pll->pll_base + ctrl->ndiv_int.offset);
+	ndiv_int = (val >> ctrl->ndiv_int.shift) &
+		bit_mask(ctrl->ndiv_int.width);
+	ndiv = ndiv_int << ctrl->ndiv_int.shift;
+
+	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
+		val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
+		ndiv_frac = (val >> ctrl->ndiv_frac.shift) &
+			bit_mask(ctrl->ndiv_frac.width);
+
+		if (ndiv_frac != 0)
+			ndiv = (ndiv_int << ctrl->ndiv_int.shift) | ndiv_frac;
+	}
+
+	val = readl(pll->pll_base + ctrl->pdiv.offset);
+	pdiv = (val >> ctrl->pdiv.shift) & bit_mask(ctrl->pdiv.width);
+
+	pll->rate = (ndiv * parent_rate) >> ctrl->ndiv_int.shift;
+
+	if (pdiv == 0)
+		pll->rate *= 2;
+	else
+		pll->rate /= pdiv;
+
+	return pll->rate;
+}
+
+static const struct clk_ops iproc_pll_ops = {
+	.enable = iproc_pll_enable,
+	.disable = iproc_pll_disable,
+	.recalc_rate = iproc_pll_recalc_rate,
+};
+
+void __init iproc_pll_setup(struct device_node *node,
+		const struct iproc_pll_ctrl *ctrl,
+		const struct iproc_pll_vco_freq_param *vco_param,
+		unsigned int num_vco_entries)
+{
+	int ret;
+	struct clk *clk;
+	struct iproc_pll *pll;
+	struct clk_init_data init;
+	const char *parent_name;
+	unsigned int rate;
+
+	if (WARN_ON(!ctrl))
+		return;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->pll_base = of_iomap(node, 0);
+	if (WARN_ON(!pll->pll_base))
+		goto err_pll_iomap;
+
+	pll->pwr_base = of_iomap(node, 1);
+	if (WARN_ON(!pll->pwr_base))
+		goto err_pwr_iomap;
+
+	/* some PLLs require gating control at the top ASIU level */
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		pll->asiu_base = of_iomap(node, 2);
+		if (WARN_ON(!pll->asiu_base))
+			goto err_asiu_iomap;
+	}
+
+	pll->ctrl = ctrl;
+	pll->name = node->name;
+	init.name = node->name;
+	init.ops = &iproc_pll_ops;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	pll->hw.init = &init;
+
+	/* configure the PLL to the desired VCO frequency if specified */
+	ret = of_property_read_u32(node, "clock-frequency", &rate);
+	if (!ret) {
+		unsigned long parent_rate;
+		int rate_index;
+
+		if (WARN_ON(!vco_param))
+			goto err_clk_register;
+
+		pll->num_vco_entries = num_vco_entries;
+		pll->vco_param = vco_param;
+
+		parent_rate = __get_rate(parent_name);
+		if (WARN_ON(!parent_rate))
+			goto err_clk_register;
+
+		rate_index = pll_get_rate_index(pll, rate);
+		if (WARN_ON(rate_index < 0))
+			goto err_clk_register;
+
+		ret = pll_set_rate(pll, rate_index, parent_rate);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+	}
+
+	clk = clk_register(NULL, &pll->hw);
+	if (WARN_ON(IS_ERR(clk)))
+		goto err_clk_register;
+
+	pll->clk_data.clk_num = 1;
+	pll->clk_data.clks = &clk;
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get,
+			&pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_add;
+
+	return;
+
+err_clk_add:
+	clk_unregister(clk);
+err_clk_register:
+	if (pll->asiu_base)
+		iounmap(pll->asiu_base);
+err_asiu_iomap:
+	iounmap(pll->pwr_base);
+err_pwr_iomap:
+	iounmap(pll->pll_base);
+err_pll_iomap:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc.h b/drivers/clk/bcm/clk-iproc.h
new file mode 100644
index 0000000..4aa0479
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc.h
@@ -0,0 +1,155 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _CLK_IPROC_H
+#define _CLK_IPROC_H
+
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/of.h>
+#include <linux/clk-provider.h>
+
+#define IPROC_CLK_NAME_LEN 25
+#define IPROC_CLK_INVALID_OFFSET 0xffffffff
+#define bit_mask(width) ((1 << (width)) - 1)
+
+/* clock should not be disabled at runtime */
+#define IPROC_CLK_AON BIT(0)
+
+/* PLL requires gating through ASIU */
+#define IPROC_CLK_PLL_ASIU BIT(1)
+
+/* PLL has fractional part of the NDIV */
+#define IPROC_CLK_PLL_HAS_NDIV_FRAC BIT(2)
+
+/*
+ * Parameters for VCO frequency configuration
+ *
+ * VCO frequency =
+ * ((ndiv_int + ndiv_frac / 2^20) * (ref freqeuncy  / pdiv)
+ */
+struct iproc_pll_vco_freq_param {
+	unsigned long rate;
+	unsigned int ndiv_int;
+	unsigned int ndiv_frac;
+	unsigned int pdiv;
+};
+
+struct iproc_clk_reg_op {
+	unsigned int offset;
+	unsigned int shift;
+	unsigned int width;
+};
+
+/*
+ * Clock gating control at the top ASIU level
+ */
+struct iproc_asiu_gate {
+	unsigned int offset;
+	unsigned int en_shift;
+};
+
+/*
+ * Control of powering on/off of a PLL
+ *
+ * Before powering off a PLL, input isolation (ISO) needs to be enabled
+ */
+struct iproc_pll_aon_pwr_ctrl {
+	unsigned int offset;
+	unsigned int pwr_width;
+	unsigned int pwr_shift;
+	unsigned int iso_shift;
+};
+
+/*
+ * Control of the PLL reset, with Ki, Kp, and Ka parameters
+ */
+struct iproc_pll_reset_ctrl {
+	unsigned int offset;
+	unsigned int reset_shift;
+	unsigned int p_reset_shift;
+	unsigned int ki_shift;
+	unsigned int ki_width;
+	unsigned int kp_shift;
+	unsigned int kp_width;
+	unsigned int ka_shift;
+	unsigned int ka_width;
+};
+
+struct iproc_pll_vco_ctrl {
+	unsigned int u_offset;
+	unsigned int l_offset;
+};
+
+/*
+ * Main PLL control parameters
+ */
+struct iproc_pll_ctrl {
+	unsigned long flags;
+	struct iproc_pll_aon_pwr_ctrl aon;
+	struct iproc_asiu_gate asiu;
+	struct iproc_pll_reset_ctrl reset;
+	struct iproc_clk_reg_op ndiv_int;
+	struct iproc_clk_reg_op ndiv_frac;
+	struct iproc_clk_reg_op pdiv;
+	struct iproc_pll_vco_ctrl vco_ctrl;
+	struct iproc_clk_reg_op status;
+};
+
+/*
+ * Controls enabling/disabling a PLL derived clock
+ */
+struct iproc_clk_enable_ctrl {
+	unsigned int offset;
+	unsigned int enable_shift;
+	unsigned int hold_shift;
+	unsigned int bypass_shift;
+};
+
+/*
+ * Main clock control parameters for clocks derived from the PLLs
+ */
+struct iproc_clk_ctrl {
+	unsigned int channel;
+	unsigned long flags;
+	struct iproc_clk_enable_ctrl enable;
+	struct iproc_clk_reg_op mdiv;
+};
+
+/*
+ * Divisor of the ASIU clocks
+ */
+struct iproc_asiu_div {
+	unsigned int offset;
+	unsigned int en_shift;
+	unsigned int high_shift;
+	unsigned int high_width;
+	unsigned int low_shift;
+	unsigned int low_width;
+};
+
+extern void __init iproc_armpll_setup(struct device_node *node);
+extern void __init iproc_pll_setup(struct device_node *node,
+		const struct iproc_pll_ctrl *ctrl,
+		const struct iproc_pll_vco_freq_param *vco_param,
+		unsigned int num_freqs);
+extern void __init iproc_clk_setup(struct device_node *node,
+		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks);
+extern void __init iproc_asiu_setup(struct device_node *node,
+		const struct iproc_asiu_div *div,
+		const struct iproc_asiu_gate *gate, unsigned int num_clks);
+
+#endif /* _CLK_IPROC_H */
-- 
1.7.9.5

[PATCH v2 2/5] clk: iproc: add initial common clock support

[Ray Jui]

This adds basic and generic support for various iProc PLLs and clocks
including the ARMPLL, GENPLL, LCPLL, MIPIPLL, and ASIU clocks.

SoCs under the iProc architecture can define their specific register
offsets and clock parameters for their PLL and clock controllers. These
parameters can be passed as arugments into the generic iProc PLL and
clock setup functions

Derived from code originally provided by Jonathan Richardson
<jonathar@broadcom.com>

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/clk/bcm/Kconfig            |    9 +
 drivers/clk/bcm/Makefile           |    1 +
 drivers/clk/bcm/clk-iproc-armpll.c |  286 +++++++++++++++++++++
 drivers/clk/bcm/clk-iproc-asiu.c   |  275 ++++++++++++++++++++
 drivers/clk/bcm/clk-iproc-clk.c    |  238 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-pll.c    |  483 ++++++++++++++++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc.h        |  155 ++++++++++++
 7 files changed, 1447 insertions(+)
 create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
 create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
 create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
 create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
 create mode 100644 drivers/clk/bcm/clk-iproc.h

diff --git a/drivers/clk/bcm/Kconfig b/drivers/clk/bcm/Kconfig
index 75506e5..66b5b7f 100644
--- a/drivers/clk/bcm/Kconfig
+++ b/drivers/clk/bcm/Kconfig
@@ -7,3 +7,12 @@ config CLK_BCM_KONA
 	  Enable common clock framework support for Broadcom SoCs
 	  using "Kona" style clock control units, including those
 	  in the BCM281xx and BCM21664 families.
+
+config COMMON_CLK_IPROC
+	bool "Broadcom iProc clock support"
+	depends on ARCH_BCM_IPROC
+	depends on COMMON_CLK
+	default y
+	help
+	  Enable common clock framework support for Broadcom SoCs
+	  based on the "iProc" architecture
diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
index 6297d05..6926636 100644
--- a/drivers/clk/bcm/Makefile
+++ b/drivers/clk/bcm/Makefile
@@ -2,3 +2,4 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
+obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
diff --git a/drivers/clk/bcm/clk-iproc-armpll.c b/drivers/clk/bcm/clk-iproc-armpll.c
new file mode 100644
index 0000000..ec9b130
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-armpll.c
@@ -0,0 +1,286 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+
+#define IPROC_CLK_MAX_FREQ_POLICY                    0x3
+#define IPROC_CLK_POLICY_FREQ_OFFSET                 0x008
+#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT      8
+#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK       0x7
+
+#define IPROC_CLK_PLLARMA_OFFSET                     0xc00
+#define IPROC_CLK_PLLARMA_LOCK_SHIFT                 28
+#define IPROC_CLK_PLLARMA_PDIV_SHIFT                 24
+#define IPROC_CLK_PLLARMA_PDIV_MASK                  0xf
+#define IPROC_CLK_PLLARMA_NDIV_INT_SHIFT             8
+#define IPROC_CLK_PLLARMA_NDIV_INT_MASK              0x3ff
+
+#define IPROC_CLK_PLLARMB_OFFSET                     0xc04
+#define IPROC_CLK_PLLARMB_NDIV_FRAC_MASK             0xfffff
+
+#define IPROC_CLK_PLLARMC_OFFSET                     0xc08
+#define IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT            8
+#define IPROC_CLK_PLLARMC_MDIV_MASK                  0xff
+
+#define IPROC_CLK_PLLARMCTL5_OFFSET                  0xc20
+#define IPROC_CLK_PLLARMCTL5_H_MDIV_MASK             0xff
+
+#define IPROC_CLK_PLLARM_OFFSET_OFFSET               0xc24
+#define IPROC_CLK_PLLARM_SW_CTL_SHIFT                29
+#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT       20
+#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK        0xff
+#define IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK       0xfffff
+
+#define IPROC_CLK_ARM_DIV_OFFSET                     0xe00
+#define IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT  4
+#define IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK        0xf
+
+#define IPROC_CLK_POLICY_DBG_OFFSET                  0xec0
+#define IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT          12
+#define IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK           0x7
+
+enum iproc_arm_pll_fid {
+	ARM_PLL_FID_CRYSTAL_CLK   = 0,
+	ARM_PLL_FID_SYS_CLK       = 2,
+	ARM_PLL_FID_CH0_SLOW_CLK  = 6,
+	ARM_PLL_FID_CH1_FAST_CLK  = 7
+};
+
+struct iproc_arm_pll {
+	struct clk_hw hw;
+	void __iomem *base;
+	struct clk_onecell_data clk_data;
+	unsigned long rate;
+};
+
+#define to_iproc_arm_pll(hw) container_of(hw, struct iproc_arm_pll, hw)
+
+static unsigned int __get_fid(struct iproc_arm_pll *pll)
+{
+	u32 val;
+	unsigned int policy, fid, active_fid;
+
+	val = readl(pll->base + IPROC_CLK_ARM_DIV_OFFSET);
+	if (val & (1 << IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT))
+		policy = val & IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK;
+	else
+		policy = 0;
+
+	/* something is seriously wrong */
+	BUG_ON(policy > IPROC_CLK_MAX_FREQ_POLICY);
+
+	val = readl(pll->base + IPROC_CLK_POLICY_FREQ_OFFSET);
+	fid = (val >> (IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT * policy)) &
+		IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK;
+
+	val = readl(pll->base + IPROC_CLK_POLICY_DBG_OFFSET);
+	active_fid = IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK &
+		(val >> IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT);
+	if (fid != active_fid) {
+		pr_debug("%s: fid override %u->%u\n", __func__,	fid,
+				active_fid);
+		fid = active_fid;
+	}
+
+	pr_debug("%s: active fid: %u\n", __func__, fid);
+
+	return fid;
+}
+
+/*
+ * Determine the mdiv (post divider) based on the frequency ID being used.
+ * There are 4 sources that can be used to derive the output clock rate:
+ *    - 25 MHz Crystal
+ *    - System clock
+ *    - PLL channel 0 (slow clock)
+ *    - PLL channel 1 (fast clock)
+ */
+static int __get_mdiv(struct iproc_arm_pll *pll)
+{
+	unsigned int fid;
+	int mdiv;
+	u32 val;
+
+	fid = __get_fid(pll);
+
+	switch (fid) {
+	case ARM_PLL_FID_CRYSTAL_CLK:
+	case ARM_PLL_FID_SYS_CLK:
+		mdiv = 1;
+		break;
+
+	case ARM_PLL_FID_CH0_SLOW_CLK:
+		val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
+		mdiv = val & IPROC_CLK_PLLARMC_MDIV_MASK;
+		if (mdiv == 0)
+			mdiv = 256;
+		break;
+
+	case ARM_PLL_FID_CH1_FAST_CLK:
+		val = readl(pll->base +	IPROC_CLK_PLLARMCTL5_OFFSET);
+		mdiv = val & IPROC_CLK_PLLARMCTL5_H_MDIV_MASK;
+		if (mdiv == 0)
+			mdiv = 256;
+		break;
+
+	default:
+		mdiv = -EFAULT;
+	}
+
+	return mdiv;
+}
+
+static unsigned int __get_ndiv(struct iproc_arm_pll *pll)
+{
+	u32 val;
+	unsigned int ndiv_int, ndiv_frac, ndiv;
+
+	val = readl(pll->base + IPROC_CLK_PLLARM_OFFSET_OFFSET);
+	if (val & (1 << IPROC_CLK_PLLARM_SW_CTL_SHIFT)) {
+		/*
+		 * offset mode is active. Read the ndiv from the PLLARM OFFSET
+		 * register
+		 */
+		ndiv_int = (val >> IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT) &
+			IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK;
+		if (ndiv_int == 0)
+			ndiv_int = 256;
+
+		ndiv_frac = val & IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK;
+	} else {
+		/* offset mode not active */
+		val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
+		ndiv_int = (val >> IPROC_CLK_PLLARMA_NDIV_INT_SHIFT) &
+			IPROC_CLK_PLLARMA_NDIV_INT_MASK;
+		if (ndiv_int == 0)
+			ndiv_int = 1024;
+
+		val = readl(pll->base + IPROC_CLK_PLLARMB_OFFSET);
+		ndiv_frac = val & IPROC_CLK_PLLARMB_NDIV_FRAC_MASK;
+	}
+
+	ndiv = (ndiv_int << 20) | ndiv_frac;
+
+	return ndiv;
+}
+
+/*
+ * The output frequency of the ARM PLL is calculated based on the ARM PLL
+ * divider values:
+ *   pdiv = ARM PLL pre-divider
+ *   ndiv = ARM PLL multiplier
+ *   mdiv = ARM PLL post divider
+ *
+ * The frequency is calculated by:
+ *   ((ndiv * parent clock rate) / pdiv) / mdiv
+ */
+static unsigned long iproc_arm_pll_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_arm_pll *pll = to_iproc_arm_pll(hw);
+	u32 val;
+	int mdiv;
+	u64 ndiv;
+	unsigned int pdiv;
+
+	/* in bypass mode, use parent rate */
+	val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
+	if (val & (1 << IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT)) {
+		pll->rate = parent_rate;
+		return pll->rate;
+	}
+
+	/* PLL needs to be locked */
+	val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
+	if (!(val & (1 << IPROC_CLK_PLLARMA_LOCK_SHIFT))) {
+		pll->rate = 0;
+		return 0;
+	}
+
+	pdiv = (val >> IPROC_CLK_PLLARMA_PDIV_SHIFT) &
+		IPROC_CLK_PLLARMA_PDIV_MASK;
+	if (pdiv == 0)
+		pdiv = 16;
+
+	ndiv = __get_ndiv(pll);
+	mdiv = __get_mdiv(pll);
+	if (mdiv <= 0) {
+		pll->rate = 0;
+		return 0;
+	}
+	pll->rate = (ndiv * parent_rate) >> 20;
+	pll->rate = (pll->rate / pdiv) / mdiv;
+
+	pr_debug("%s: ARM PLL rate: %lu. parent rate: %lu\n", __func__,
+			pll->rate, parent_rate);
+	pr_debug("%s: ndiv_int: %u, pdiv: %u, mdiv: %d\n", __func__,
+			(unsigned int)(ndiv >> 20), pdiv, mdiv);
+
+	return pll->rate;
+}
+
+static const struct clk_ops iproc_arm_pll_ops = {
+	.recalc_rate = iproc_arm_pll_recalc_rate,
+};
+
+void __init iproc_armpll_setup(struct device_node *node)
+{
+	int ret;
+	struct clk *clk;
+	struct iproc_arm_pll *pll;
+	struct clk_init_data init;
+	const char *parent_name;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->base = of_iomap(node, 0);
+	if (WARN_ON(!pll->base))
+		goto err_free_pll;
+
+	init.name = node->name;
+	init.ops = &iproc_arm_pll_ops;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	pll->hw.init = &init;
+
+	clk = clk_register(NULL, &pll->hw);
+	if (WARN_ON(IS_ERR(clk)))
+		goto err_iounmap;
+
+	pll->clk_data.clk_num = 1;
+	pll->clk_data.clks = &clk;
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_unregister;
+
+	return;
+
+err_clk_unregister:
+	clk_unregister(clk);
+err_iounmap:
+	iounmap(pll->base);
+err_free_pll:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc-asiu.c b/drivers/clk/bcm/clk-iproc-asiu.c
new file mode 100644
index 0000000..ab86b8c
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-asiu.c
@@ -0,0 +1,275 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+struct iproc_asiu;
+
+struct iproc_asiu_clk {
+	struct clk_hw hw;
+	const char *name;
+	struct iproc_asiu *asiu;
+	unsigned long rate;
+	struct iproc_asiu_div div;
+	struct iproc_asiu_gate gate;
+};
+
+struct iproc_asiu {
+	void __iomem *div_base;
+	void __iomem *gate_base;
+
+	struct clk_onecell_data clk_data;
+	struct iproc_asiu_clk *clks;
+};
+
+#define to_asiu_clk(hw) container_of(hw, struct iproc_asiu_clk, hw)
+
+static int iproc_asiu_clk_enable(struct clk_hw *hw)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+
+	/* some clocks at the ASIU level are always enabled */
+	if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
+		return 0;
+
+	val = readl(asiu->gate_base + clk->gate.offset);
+	val |= (1 << clk->gate.en_shift);
+	writel(val, asiu->gate_base + clk->gate.offset);
+
+	return 0;
+}
+
+static void iproc_asiu_clk_disable(struct clk_hw *hw)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+
+	/* some clocks at the ASIU level are always enabled */
+	if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
+		return;
+
+	val = readl(asiu->gate_base + clk->gate.offset);
+	val &= ~(1 << clk->gate.en_shift);
+	writel(val, asiu->gate_base + clk->gate.offset);
+}
+
+static unsigned long iproc_asiu_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+	unsigned int div_h, div_l;
+
+	if (parent_rate == 0) {
+		clk->rate = 0;
+		return 0;
+	}
+
+	/* if clock divisor is not enabled, simply return parent rate */
+	val = readl(asiu->div_base + clk->div.offset);
+	if ((val & (1 << clk->div.en_shift)) == 0) {
+		clk->rate = parent_rate;
+		return parent_rate;
+	}
+
+	/* clock rate = parent rate / (high_div + 1) + (low_div + 1) */
+	div_h = (val >> clk->div.high_shift) & bit_mask(clk->div.high_width);
+	div_h++;
+	div_l = (val >> clk->div.low_shift) & bit_mask(clk->div.low_width);
+	div_l++;
+
+	clk->rate = parent_rate / (div_h + div_l);
+	pr_debug("%s: rate: %lu. parent rate: %lu div_h: %u div_l: %u\n",
+		__func__, clk->rate, parent_rate, div_h, div_l);
+
+	return clk->rate;
+}
+
+static long iproc_asiu_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	unsigned int div;
+
+	if (rate == 0 || *parent_rate == 0)
+		return -EINVAL;
+
+	if (rate == *parent_rate)
+		return *parent_rate;
+
+	div = DIV_ROUND_UP(*parent_rate, rate);
+	if (div < 2)
+		return *parent_rate;
+
+	return *parent_rate / div;
+}
+
+static int iproc_asiu_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	unsigned int div, div_h, div_l;
+	u32 val;
+
+	if (rate == 0 || parent_rate == 0)
+		return -EINVAL;
+
+	/* simply disable the divisor if one wants the same rate as parent */
+	if (rate == parent_rate) {
+		val = readl(asiu->div_base + clk->div.offset);
+		val &= ~(1 << clk->div.en_shift);
+		writel(val, asiu->div_base + clk->div.offset);
+		return 0;
+	}
+
+	div = DIV_ROUND_UP(parent_rate, rate);
+	if (div < 2)
+		return -EINVAL;
+
+	div_h = div_l = div >> 1;
+	div_h--;
+	div_l--;
+
+	val = readl(asiu->div_base + clk->div.offset);
+	val |= 1 << clk->div.en_shift;
+	if (div_h) {
+		val &= ~(bit_mask(clk->div.high_width)
+				<< clk->div.high_shift);
+		val |= div_h << clk->div.high_shift;
+	} else {
+		val &= ~(bit_mask(clk->div.high_width)
+				<< clk->div.high_shift);
+	}
+	if (div_l) {
+		val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
+		val |= div_l << clk->div.low_shift;
+	} else {
+		val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
+	}
+	writel(val, asiu->div_base + clk->div.offset);
+
+	return 0;
+}
+
+static const struct clk_ops iproc_asiu_ops = {
+	.enable = iproc_asiu_clk_enable,
+	.disable = iproc_asiu_clk_disable,
+	.recalc_rate = iproc_asiu_clk_recalc_rate,
+	.round_rate = iproc_asiu_clk_round_rate,
+	.set_rate = iproc_asiu_clk_set_rate,
+};
+
+void __init iproc_asiu_setup(struct device_node *node,
+		const struct iproc_asiu_div *div,
+		const struct iproc_asiu_gate *gate, unsigned int num_clks)
+{
+	int i, ret;
+	struct iproc_asiu *asiu;
+
+	if (WARN_ON(!gate || !div))
+		return;
+
+	asiu = kzalloc(sizeof(*asiu), GFP_KERNEL);
+	if (WARN_ON(!asiu))
+		return;
+
+	asiu->clk_data.clk_num = num_clks;
+	asiu->clk_data.clks = kcalloc(num_clks, sizeof(*asiu->clk_data.clks),
+			GFP_KERNEL);
+	if (WARN_ON(!asiu->clk_data.clks))
+		goto err_clks;
+
+	asiu->clks = kcalloc(num_clks, sizeof(*asiu->clks), GFP_KERNEL);
+	if (WARN_ON(!asiu->clks))
+		goto err_asiu_clks;
+
+	asiu->div_base = of_iomap(node, 0);
+	if (WARN_ON(!asiu->div_base))
+		goto err_iomap_div;
+
+	asiu->gate_base = of_iomap(node, 1);
+	if (WARN_ON(!asiu->gate_base))
+		goto err_iomap_gate;
+
+	for (i = 0; i < num_clks; i++) {
+		struct clk_init_data init;
+		struct clk *clk;
+		const char *parent_name;
+		struct iproc_asiu_clk *asiu_clk;
+		const char *clk_name;
+
+		clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
+		if (WARN_ON(!clk_name))
+			goto err_clk_register;
+
+		ret = of_property_read_string_index(node, "clock-output-names",
+				i, &clk_name);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+
+		asiu_clk = &asiu->clks[i];
+		asiu_clk->name = clk_name;
+		asiu_clk->asiu = asiu;
+		asiu_clk->div = div[i];
+		asiu_clk->gate = gate[i];
+		init.name = clk_name;
+		init.ops = &iproc_asiu_ops;
+		init.flags = 0;
+		parent_name = of_clk_get_parent_name(node, 0);
+		init.parent_names = (parent_name ? &parent_name : NULL);
+		init.num_parents = (parent_name ? 1 : 0);
+		asiu_clk->hw.init = &init;
+
+		clk = clk_register(NULL, &asiu_clk->hw);
+		if (WARN_ON(IS_ERR(clk)))
+			goto err_clk_register;
+		asiu->clk_data.clks[i] = clk;
+	}
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get,
+			&asiu->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_register;
+
+	return;
+
+err_clk_register:
+	for (i = 0; i < num_clks; i++)
+		kfree(asiu->clks[i].name);
+	iounmap(asiu->gate_base);
+
+err_iomap_gate:
+	iounmap(asiu->div_base);
+
+err_iomap_div:
+	kfree(asiu->clks);
+
+err_asiu_clks:
+	kfree(asiu->clk_data.clks);
+
+err_clks:
+	kfree(asiu);
+}
diff --git a/drivers/clk/bcm/clk-iproc-clk.c b/drivers/clk/bcm/clk-iproc-clk.c
new file mode 100644
index 0000000..be3c42c
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-clk.c
@@ -0,0 +1,238 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+struct iproc_pll;
+
+struct iproc_clk {
+	struct clk_hw hw;
+	const char *name;
+	struct iproc_pll *pll;
+	unsigned long rate;
+	const struct iproc_clk_ctrl *ctrl;
+};
+
+struct iproc_pll {
+	void __iomem *base;
+	struct clk_onecell_data clk_data;
+	struct iproc_clk *clks;
+};
+
+#define to_iproc_clk(hw) container_of(hw, struct iproc_clk, hw)
+
+static int iproc_clk_enable(struct clk_hw *hw)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+
+	/* channel enable is active low */
+	val = readl(pll->base + ctrl->enable.offset);
+	val &= ~(1 << ctrl->enable.enable_shift);
+	writel(val, pll->base + ctrl->enable.offset);
+
+	/* also make sure channel is not held */
+	val = readl(pll->base + ctrl->enable.offset);
+	val &= ~(1 << ctrl->enable.hold_shift);
+	writel(val, pll->base + ctrl->enable.offset);
+
+	return 0;
+}
+
+static void iproc_clk_disable(struct clk_hw *hw)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+
+	if (ctrl->flags & IPROC_CLK_AON)
+		return;
+
+	val = readl(pll->base + ctrl->enable.offset);
+	val |= 1 << ctrl->enable.enable_shift;
+	writel(val, pll->base + ctrl->enable.offset);
+}
+
+static unsigned long iproc_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+	unsigned int mdiv;
+
+	if (parent_rate == 0)
+		return 0;
+
+	val = readl(pll->base + ctrl->mdiv.offset);
+	mdiv = (val >> ctrl->mdiv.shift) & bit_mask(ctrl->mdiv.width);
+	if (mdiv == 0)
+		mdiv = 256;
+
+	clk->rate = parent_rate / mdiv;
+
+	return clk->rate;
+}
+
+static long iproc_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	unsigned int div;
+
+	if (rate == 0 || *parent_rate == 0)
+		return -EINVAL;
+
+	if (rate == *parent_rate)
+		return *parent_rate;
+
+	div = DIV_ROUND_UP(*parent_rate, rate);
+	if (div < 2)
+		return *parent_rate;
+
+	if (div > 256)
+		div = 256;
+
+	return *parent_rate / div;
+}
+
+static int iproc_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+	unsigned int div;
+
+	if (rate == 0 || parent_rate == 0)
+		return -EINVAL;
+
+	div = DIV_ROUND_UP(parent_rate, rate);
+	if (div > 256)
+		return -EINVAL;
+
+	val = readl(pll->base + ctrl->mdiv.offset);
+	if (div == 256) {
+		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
+	} else {
+		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
+		val |= div << ctrl->mdiv.shift;
+	}
+	writel(val, pll->base + ctrl->mdiv.offset);
+	clk->rate = parent_rate / div;
+
+	return 0;
+}
+
+static const struct clk_ops iproc_clk_ops = {
+	.enable = iproc_clk_enable,
+	.disable = iproc_clk_disable,
+	.recalc_rate = iproc_clk_recalc_rate,
+	.round_rate = iproc_clk_round_rate,
+	.set_rate = iproc_clk_set_rate,
+};
+
+void __init iproc_clk_setup(struct device_node *node,
+		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks)
+{
+	int i, ret;
+	struct iproc_pll *pll;
+
+	if (WARN_ON(!ctrl))
+		return;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->clk_data.clk_num = num_clks;
+	pll->clk_data.clks = kcalloc(num_clks, sizeof(*pll->clk_data.clks),
+			GFP_KERNEL);
+	if (WARN_ON(!pll->clk_data.clks))
+		goto err_clks;
+
+	pll->clks = kcalloc(num_clks, sizeof(*pll->clks), GFP_KERNEL);
+	if (WARN_ON(!pll->clks))
+		goto err_pll_clks;
+
+	pll->base = of_iomap(node, 0);
+	if (WARN_ON(!pll->base))
+		goto err_iomap;
+
+	for (i = 0; i < num_clks; i++) {
+		struct clk_init_data init;
+		struct clk *clk;
+		const char *parent_name;
+		struct iproc_clk *iclk;
+		const char *clk_name;
+
+		clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
+		if (WARN_ON(!clk_name))
+			goto err_clk_register;
+
+		ret = of_property_read_string_index(node, "clock-output-names",
+				i, &clk_name);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+
+		iclk = &pll->clks[i];
+		iclk->name = clk_name;
+		iclk->pll = pll;
+		iclk->ctrl = &ctrl[i];
+		init.name = clk_name;
+		init.ops = &iproc_clk_ops;
+		init.flags = 0;
+		parent_name = of_clk_get_parent_name(node, 0);
+		init.parent_names = (parent_name ? &parent_name : NULL);
+		init.num_parents = (parent_name ? 1 : 0);
+		iclk->hw.init = &init;
+
+		clk = clk_register(NULL, &iclk->hw);
+		if (WARN_ON(IS_ERR(clk)))
+			goto err_clk_register;
+		pll->clk_data.clks[i] = clk;
+	}
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_register;
+
+	return;
+
+err_clk_register:
+	for (i = 0; i < num_clks; i++)
+		kfree(pll->clks[i].name);
+	iounmap(pll->base);
+
+err_iomap:
+	kfree(pll->clks);
+
+err_pll_clks:
+	kfree(pll->clk_data.clks);
+
+err_clks:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc-pll.c b/drivers/clk/bcm/clk-iproc-pll.c
new file mode 100644
index 0000000..cd3bd38
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-pll.c
@@ -0,0 +1,483 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+#define PLL_VCO_HIGH_SHIFT 19
+#define PLL_VCO_LOW_SHIFT  30
+
+/* number of delay loops waiting for PLL to lock */
+#define LOCK_DELAY 100
+
+/* number of VCO frequency bands */
+#define NUM_FREQ_BANDS 8
+
+#define NUM_KP_BANDS 3
+enum kp_band {
+	KP_BAND_MID = 0,
+	KP_BAND_HIGH,
+	KP_BAND_HIGH_HIGH
+};
+
+static const unsigned int kp_table[NUM_KP_BANDS][NUM_FREQ_BANDS] = {
+	{ 5, 6, 6, 7, 7, 8, 9, 10 },
+	{ 4, 4, 5, 5, 6, 7, 8, 9  },
+	{ 4, 5, 5, 6, 7, 8, 9, 10 },
+};
+
+static const unsigned long ref_freq_table[NUM_FREQ_BANDS][2] = {
+	{ 10000000,  12500000  },
+	{ 12500000,  15000000  },
+	{ 15000000,  20000000  },
+	{ 20000000,  25000000  },
+	{ 25000000,  50000000  },
+	{ 50000000,  75000000  },
+	{ 75000000,  100000000 },
+	{ 100000000, 125000000 },
+};
+
+enum vco_freq_range {
+	VCO_LOW       = 700000000U,
+	VCO_MID       = 1200000000U,
+	VCO_HIGH      = 2200000000U,
+	VCO_HIGH_HIGH = 3100000000U,
+	VCO_MAX       = 4000000000U,
+};
+
+struct iproc_pll {
+	struct clk_hw hw;
+	void __iomem *pll_base;
+	void __iomem *pwr_base;
+	void __iomem *asiu_base;
+	struct clk_onecell_data clk_data;
+	const char *name;
+	const struct iproc_pll_ctrl *ctrl;
+	const struct iproc_pll_vco_freq_param *vco_param;
+	unsigned int num_vco_entries;
+	unsigned long rate;
+};
+
+#define to_iproc_pll(hw) container_of(hw, struct iproc_pll, hw)
+
+/*
+ * Get the clock rate based on name
+ */
+static unsigned long __get_rate(const char *clk_name)
+{
+	struct clk *clk;
+
+	clk = __clk_lookup(clk_name);
+	if (!clk) {
+		pr_err("%s: unable to find clock by name: %s\n", __func__,
+				clk_name);
+		return 0;
+	}
+
+	return clk_get_rate(clk);
+}
+
+/*
+ * Based on the target frequency, find a match from the VCO frequency parameter
+ * table and return its index
+ */
+static int pll_get_rate_index(struct iproc_pll *pll, unsigned int target_rate)
+{
+	int i;
+
+	for (i = 0; i < pll->num_vco_entries; i++)
+		if (target_rate == pll->vco_param[i].rate)
+			break;
+
+	if (i >= pll->num_vco_entries)
+		return -EINVAL;
+
+	return i;
+}
+
+static int get_kp(unsigned long ref_freq, enum kp_band kp_index)
+{
+	int i;
+
+	if (ref_freq < ref_freq_table[0][0])
+		return -EINVAL;
+
+	for (i = 0; i < NUM_FREQ_BANDS; i++) {
+		if (ref_freq >= ref_freq_table[i][0] &&
+			ref_freq < ref_freq_table[i][1])
+			return kp_table[kp_index][i];
+	}
+	return -EINVAL;
+}
+
+static int pll_wait_for_lock(struct iproc_pll *pll)
+{
+	int i;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+
+	for (i = 0; i < LOCK_DELAY; i++) {
+		u32 val = readl(pll->pll_base + ctrl->status.offset);
+
+		if (val & (1 << ctrl->status.shift))
+			return 0;
+		udelay(10);
+	}
+
+	return -EIO;
+}
+
+static void __pll_disable(struct iproc_pll *pll)
+{
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		val = readl(pll->asiu_base + ctrl->asiu.offset);
+		val &= ~(1 << ctrl->asiu.en_shift);
+		writel(val, pll->asiu_base + ctrl->asiu.offset);
+	}
+
+	/* latch input value so core power can be shut down */
+	val = readl(pll->pwr_base + ctrl->aon.offset);
+	val |= (1 << ctrl->aon.iso_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+
+	/* power down the core */
+	val &= ~(bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+}
+
+static int __pll_enable(struct iproc_pll *pll)
+{
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+
+	/* power up the PLL and make sure it's not latched */
+	val = readl(pll->pwr_base + ctrl->aon.offset);
+	val |= bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift;
+	val &= ~(1 << ctrl->aon.iso_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+
+	/* certain PLLs also need to be ungated from the ASIU top level */
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		val = readl(pll->asiu_base + ctrl->asiu.offset);
+		val |= (1 << ctrl->asiu.en_shift);
+		writel(val, pll->asiu_base + ctrl->asiu.offset);
+	}
+
+	return 0;
+}
+
+static void __pll_put_in_reset(struct iproc_pll *pll)
+{
+	u32 val;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
+
+	val = readl(pll->pll_base + reset->offset);
+	val &= ~(1 << reset->reset_shift | 1 << reset->p_reset_shift);
+	writel(val, pll->pll_base + reset->offset);
+}
+
+static void __pll_bring_out_reset(struct iproc_pll *pll, unsigned int kp,
+		unsigned int ka, unsigned int ki)
+{
+	u32 val;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
+
+	val = readl(pll->pll_base + reset->offset);
+	val &= ~(bit_mask(reset->ki_width) << reset->ki_shift |
+		bit_mask(reset->kp_width) << reset->kp_shift |
+		bit_mask(reset->ka_width) << reset->ka_shift);
+	val |=  ki << reset->ki_shift | kp << reset->kp_shift |
+		ka << reset->ka_shift;
+	val |= 1 << reset->reset_shift | 1 << reset->p_reset_shift;
+	writel(val, pll->pll_base + reset->offset);
+}
+
+static int pll_set_rate(struct iproc_pll *pll, unsigned int rate_index,
+		unsigned long parent_rate)
+{
+	const struct iproc_pll_vco_freq_param *vco =
+				&pll->vco_param[rate_index];
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	int ka = 0, ki, kp, ret;
+	unsigned long rate = vco->rate;
+	u32 val;
+	enum kp_band kp_index;
+	unsigned long ref_freq;
+
+	/*
+	 * reference frequency = parent frequency / PDIV
+	 * If PDIV = 0, then it becomes a multiplier (x2)
+	 */
+	if (vco->pdiv == 0)
+		ref_freq = parent_rate * 2;
+	else
+		ref_freq = parent_rate / vco->pdiv;
+
+	/* determine Ki and Kp index based on target VCO frequency */
+	if (rate >= VCO_LOW && rate < VCO_HIGH) {
+		ki = 4;
+		kp_index = KP_BAND_MID;
+	} else if (rate >= VCO_HIGH && rate && rate < VCO_HIGH_HIGH) {
+		ki = 3;
+		kp_index = KP_BAND_HIGH;
+	} else if (rate >= VCO_HIGH_HIGH && rate < VCO_MAX) {
+		ki = 3;
+		kp_index = KP_BAND_HIGH_HIGH;
+	} else {
+		pr_err("%s: pll: %s has invalid rate: %lu\n", __func__,
+				pll->name, rate);
+		return -EINVAL;
+	}
+
+	kp = get_kp(ref_freq, kp_index);
+	if (kp < 0) {
+		pr_err("%s: pll: %s has invalid kp\n", __func__, pll->name);
+		return kp;
+	}
+
+	ret = __pll_enable(pll);
+	if (ret) {
+		pr_err("%s: pll: %s fails to enable\n", __func__, pll->name);
+		return ret;
+	}
+
+	/* put PLL in reset */
+	__pll_put_in_reset(pll);
+
+	writel(0, pll->pll_base + ctrl->vco_ctrl.u_offset);
+	val = readl(pll->pll_base + ctrl->vco_ctrl.l_offset);
+
+	if (rate >= VCO_LOW && rate < VCO_MID)
+		val |= (1 << PLL_VCO_LOW_SHIFT);
+
+	if (rate < VCO_HIGH)
+		val &= ~(1 << PLL_VCO_HIGH_SHIFT);
+	else
+		val |= (1 << PLL_VCO_HIGH_SHIFT);
+
+	writel(val, pll->pll_base + ctrl->vco_ctrl.l_offset);
+
+	/* program integer part of NDIV */
+	val = readl(pll->pll_base + ctrl->ndiv_int.offset);
+	val &= ~(bit_mask(ctrl->ndiv_int.width) << ctrl->ndiv_int.shift);
+	val |= vco->ndiv_int << ctrl->ndiv_int.shift;
+	writel(val, pll->pll_base + ctrl->ndiv_int.offset);
+
+	/* program fractional part of NDIV */
+	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
+		val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
+		val &= ~(bit_mask(ctrl->ndiv_frac.width) <<
+				ctrl->ndiv_frac.shift);
+		val |= vco->ndiv_frac << ctrl->ndiv_frac.shift;
+		writel(val, pll->pll_base + ctrl->ndiv_frac.offset);
+	}
+
+	/* program PDIV */
+	val = readl(pll->pll_base + ctrl->pdiv.offset);
+	val &= ~(bit_mask(ctrl->pdiv.width) << ctrl->pdiv.shift);
+	val |= vco->pdiv << ctrl->pdiv.shift;
+	writel(val, pll->pll_base + ctrl->pdiv.offset);
+
+	__pll_bring_out_reset(pll, kp, ka, ki);
+
+	ret = pll_wait_for_lock(pll);
+	if (ret < 0) {
+		pr_err("%s: pll: %s failed to lock\n", __func__, pll->name);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int iproc_pll_enable(struct clk_hw *hw)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+
+	return __pll_enable(pll);
+}
+
+static void iproc_pll_disable(struct clk_hw *hw)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+
+	if (ctrl->flags & IPROC_CLK_AON)
+		return;
+
+	__pll_disable(pll);
+}
+
+static unsigned long iproc_pll_recalc_rate(struct clk_hw *hw,
+	unsigned long parent_rate)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+	u64 ndiv;
+	unsigned int ndiv_int, ndiv_frac, pdiv;
+
+	if (parent_rate == 0)
+		return 0;
+
+	/* PLL needs to be locked */
+	val = readl(pll->pll_base + ctrl->status.offset);
+	if ((val & (1 << ctrl->status.shift)) == 0) {
+		pll->rate = 0;
+		return 0;
+	}
+
+	/*
+	 * PLL output frequency =
+	 *
+	 * ((ndiv_int + ndiv_frac / 2^20) * (parent clock rate / pdiv)
+	 */
+	val = readl(pll->pll_base + ctrl->ndiv_int.offset);
+	ndiv_int = (val >> ctrl->ndiv_int.shift) &
+		bit_mask(ctrl->ndiv_int.width);
+	ndiv = ndiv_int << ctrl->ndiv_int.shift;
+
+	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
+		val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
+		ndiv_frac = (val >> ctrl->ndiv_frac.shift) &
+			bit_mask(ctrl->ndiv_frac.width);
+
+		if (ndiv_frac != 0)
+			ndiv = (ndiv_int << ctrl->ndiv_int.shift) | ndiv_frac;
+	}
+
+	val = readl(pll->pll_base + ctrl->pdiv.offset);
+	pdiv = (val >> ctrl->pdiv.shift) & bit_mask(ctrl->pdiv.width);
+
+	pll->rate = (ndiv * parent_rate) >> ctrl->ndiv_int.shift;
+
+	if (pdiv == 0)
+		pll->rate *= 2;
+	else
+		pll->rate /= pdiv;
+
+	return pll->rate;
+}
+
+static const struct clk_ops iproc_pll_ops = {
+	.enable = iproc_pll_enable,
+	.disable = iproc_pll_disable,
+	.recalc_rate = iproc_pll_recalc_rate,
+};
+
+void __init iproc_pll_setup(struct device_node *node,
+		const struct iproc_pll_ctrl *ctrl,
+		const struct iproc_pll_vco_freq_param *vco_param,
+		unsigned int num_vco_entries)
+{
+	int ret;
+	struct clk *clk;
+	struct iproc_pll *pll;
+	struct clk_init_data init;
+	const char *parent_name;
+	unsigned int rate;
+
+	if (WARN_ON(!ctrl))
+		return;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->pll_base = of_iomap(node, 0);
+	if (WARN_ON(!pll->pll_base))
+		goto err_pll_iomap;
+
+	pll->pwr_base = of_iomap(node, 1);
+	if (WARN_ON(!pll->pwr_base))
+		goto err_pwr_iomap;
+
+	/* some PLLs require gating control at the top ASIU level */
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		pll->asiu_base = of_iomap(node, 2);
+		if (WARN_ON(!pll->asiu_base))
+			goto err_asiu_iomap;
+	}
+
+	pll->ctrl = ctrl;
+	pll->name = node->name;
+	init.name = node->name;
+	init.ops = &iproc_pll_ops;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	pll->hw.init = &init;
+
+	/* configure the PLL to the desired VCO frequency if specified */
+	ret = of_property_read_u32(node, "clock-frequency", &rate);
+	if (!ret) {
+		unsigned long parent_rate;
+		int rate_index;
+
+		if (WARN_ON(!vco_param))
+			goto err_clk_register;
+
+		pll->num_vco_entries = num_vco_entries;
+		pll->vco_param = vco_param;
+
+		parent_rate = __get_rate(parent_name);
+		if (WARN_ON(!parent_rate))
+			goto err_clk_register;
+
+		rate_index = pll_get_rate_index(pll, rate);
+		if (WARN_ON(rate_index < 0))
+			goto err_clk_register;
+
+		ret = pll_set_rate(pll, rate_index, parent_rate);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+	}
+
+	clk = clk_register(NULL, &pll->hw);
+	if (WARN_ON(IS_ERR(clk)))
+		goto err_clk_register;
+
+	pll->clk_data.clk_num = 1;
+	pll->clk_data.clks = &clk;
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get,
+			&pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_add;
+
+	return;
+
+err_clk_add:
+	clk_unregister(clk);
+err_clk_register:
+	if (pll->asiu_base)
+		iounmap(pll->asiu_base);
+err_asiu_iomap:
+	iounmap(pll->pwr_base);
+err_pwr_iomap:
+	iounmap(pll->pll_base);
+err_pll_iomap:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc.h b/drivers/clk/bcm/clk-iproc.h
new file mode 100644
index 0000000..4aa0479
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc.h
@@ -0,0 +1,155 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _CLK_IPROC_H
+#define _CLK_IPROC_H
+
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/of.h>
+#include <linux/clk-provider.h>
+
+#define IPROC_CLK_NAME_LEN 25
+#define IPROC_CLK_INVALID_OFFSET 0xffffffff
+#define bit_mask(width) ((1 << (width)) - 1)
+
+/* clock should not be disabled at runtime */
+#define IPROC_CLK_AON BIT(0)
+
+/* PLL requires gating through ASIU */
+#define IPROC_CLK_PLL_ASIU BIT(1)
+
+/* PLL has fractional part of the NDIV */
+#define IPROC_CLK_PLL_HAS_NDIV_FRAC BIT(2)
+
+/*
+ * Parameters for VCO frequency configuration
+ *
+ * VCO frequency =
+ * ((ndiv_int + ndiv_frac / 2^20) * (ref freqeuncy  / pdiv)
+ */
+struct iproc_pll_vco_freq_param {
+	unsigned long rate;
+	unsigned int ndiv_int;
+	unsigned int ndiv_frac;
+	unsigned int pdiv;
+};
+
+struct iproc_clk_reg_op {
+	unsigned int offset;
+	unsigned int shift;
+	unsigned int width;
+};
+
+/*
+ * Clock gating control@the top ASIU level
+ */
+struct iproc_asiu_gate {
+	unsigned int offset;
+	unsigned int en_shift;
+};
+
+/*
+ * Control of powering on/off of a PLL
+ *
+ * Before powering off a PLL, input isolation (ISO) needs to be enabled
+ */
+struct iproc_pll_aon_pwr_ctrl {
+	unsigned int offset;
+	unsigned int pwr_width;
+	unsigned int pwr_shift;
+	unsigned int iso_shift;
+};
+
+/*
+ * Control of the PLL reset, with Ki, Kp, and Ka parameters
+ */
+struct iproc_pll_reset_ctrl {
+	unsigned int offset;
+	unsigned int reset_shift;
+	unsigned int p_reset_shift;
+	unsigned int ki_shift;
+	unsigned int ki_width;
+	unsigned int kp_shift;
+	unsigned int kp_width;
+	unsigned int ka_shift;
+	unsigned int ka_width;
+};
+
+struct iproc_pll_vco_ctrl {
+	unsigned int u_offset;
+	unsigned int l_offset;
+};
+
+/*
+ * Main PLL control parameters
+ */
+struct iproc_pll_ctrl {
+	unsigned long flags;
+	struct iproc_pll_aon_pwr_ctrl aon;
+	struct iproc_asiu_gate asiu;
+	struct iproc_pll_reset_ctrl reset;
+	struct iproc_clk_reg_op ndiv_int;
+	struct iproc_clk_reg_op ndiv_frac;
+	struct iproc_clk_reg_op pdiv;
+	struct iproc_pll_vco_ctrl vco_ctrl;
+	struct iproc_clk_reg_op status;
+};
+
+/*
+ * Controls enabling/disabling a PLL derived clock
+ */
+struct iproc_clk_enable_ctrl {
+	unsigned int offset;
+	unsigned int enable_shift;
+	unsigned int hold_shift;
+	unsigned int bypass_shift;
+};
+
+/*
+ * Main clock control parameters for clocks derived from the PLLs
+ */
+struct iproc_clk_ctrl {
+	unsigned int channel;
+	unsigned long flags;
+	struct iproc_clk_enable_ctrl enable;
+	struct iproc_clk_reg_op mdiv;
+};
+
+/*
+ * Divisor of the ASIU clocks
+ */
+struct iproc_asiu_div {
+	unsigned int offset;
+	unsigned int en_shift;
+	unsigned int high_shift;
+	unsigned int high_width;
+	unsigned int low_shift;
+	unsigned int low_width;
+};
+
+extern void __init iproc_armpll_setup(struct device_node *node);
+extern void __init iproc_pll_setup(struct device_node *node,
+		const struct iproc_pll_ctrl *ctrl,
+		const struct iproc_pll_vco_freq_param *vco_param,
+		unsigned int num_freqs);
+extern void __init iproc_clk_setup(struct device_node *node,
+		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks);
+extern void __init iproc_asiu_setup(struct device_node *node,
+		const struct iproc_asiu_div *div,
+		const struct iproc_asiu_gate *gate, unsigned int num_clks);
+
+#endif /* _CLK_IPROC_H */
-- 
1.7.9.5

[PATCH v2 3/5] clk: Change bcm clocks build dependency

[Ray Jui]

The clock code under drivers/clk/bcm now contains code for both the
Broadcom mobile SoCs and the iProc SoCs. Change the the makefile
dependency to be under config flag CONFIG_ARCH_BCM that's enabled for
both families of SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 drivers/clk/Makefile |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index d5fba5b..eff0213 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -41,7 +41,7 @@ obj-$(CONFIG_ARCH_VT8500)		+= clk-vt8500.o
 obj-$(CONFIG_COMMON_CLK_WM831X)		+= clk-wm831x.o
 obj-$(CONFIG_COMMON_CLK_XGENE)		+= clk-xgene.o
 obj-$(CONFIG_COMMON_CLK_AT91)		+= at91/
-obj-$(CONFIG_ARCH_BCM_MOBILE)		+= bcm/
+obj-$(CONFIG_ARCH_BCM)			+= bcm/
 obj-$(CONFIG_ARCH_BERLIN)		+= berlin/
 obj-$(CONFIG_ARCH_HI3xxx)		+= hisilicon/
 obj-$(CONFIG_ARCH_HIP04)		+= hisilicon/
-- 
1.7.9.5

[PATCH v2 3/5] clk: Change bcm clocks build dependency

[Ray Jui]

The clock code under drivers/clk/bcm now contains code for both the
Broadcom mobile SoCs and the iProc SoCs. Change the the makefile
dependency to be under config flag CONFIG_ARCH_BCM that's enabled for
both families of SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 drivers/clk/Makefile |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index d5fba5b..eff0213 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -41,7 +41,7 @@ obj-$(CONFIG_ARCH_VT8500)		+= clk-vt8500.o
 obj-$(CONFIG_COMMON_CLK_WM831X)		+= clk-wm831x.o
 obj-$(CONFIG_COMMON_CLK_XGENE)		+= clk-xgene.o
 obj-$(CONFIG_COMMON_CLK_AT91)		+= at91/
-obj-$(CONFIG_ARCH_BCM_MOBILE)		+= bcm/
+obj-$(CONFIG_ARCH_BCM)			+= bcm/
 obj-$(CONFIG_ARCH_BERLIN)		+= berlin/
 obj-$(CONFIG_ARCH_HI3xxx)		+= hisilicon/
 obj-$(CONFIG_ARCH_HIP04)		+= hisilicon/
-- 
1.7.9.5

[PATCH v2 3/5] clk: Change bcm clocks build dependency

[Ray Jui]

The clock code under drivers/clk/bcm now contains code for both the
Broadcom mobile SoCs and the iProc SoCs. Change the the makefile
dependency to be under config flag CONFIG_ARCH_BCM that's enabled for
both families of SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 drivers/clk/Makefile |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index d5fba5b..eff0213 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -41,7 +41,7 @@ obj-$(CONFIG_ARCH_VT8500)		+= clk-vt8500.o
 obj-$(CONFIG_COMMON_CLK_WM831X)		+= clk-wm831x.o
 obj-$(CONFIG_COMMON_CLK_XGENE)		+= clk-xgene.o
 obj-$(CONFIG_COMMON_CLK_AT91)		+= at91/
-obj-$(CONFIG_ARCH_BCM_MOBILE)		+= bcm/
+obj-$(CONFIG_ARCH_BCM)			+= bcm/
 obj-$(CONFIG_ARCH_BERLIN)		+= berlin/
 obj-$(CONFIG_ARCH_HI3xxx)		+= hisilicon/
 obj-$(CONFIG_ARCH_HIP04)		+= hisilicon/
-- 
1.7.9.5

[PATCH v2 4/5] clk: cygnus: add clock support for Broadcom Cygnus

[Ray Jui]

The Broadcom Cygnus SoC is architected under the iProc architecture. It
has the following PLLs: ARMPLL, GENPLL, LCPLL0, MIPIPLL, all dervied
from an onboard crystal. Cygnus also has various ASIU clocks that are
derived directly from the onboard crystal.

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/clk/bcm/Makefile               |    1 +
 drivers/clk/bcm/clk-cygnus.c           |  277 ++++++++++++++++++++++++++++++++
 include/dt-bindings/clock/bcm-cygnus.h |   77 +++++++++
 3 files changed, 355 insertions(+)
 create mode 100644 drivers/clk/bcm/clk-cygnus.c
 create mode 100644 include/dt-bindings/clock/bcm-cygnus.h

diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
index 6926636..afcbe55 100644
--- a/drivers/clk/bcm/Makefile
+++ b/drivers/clk/bcm/Makefile
@@ -3,3 +3,4 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
 obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
+obj-$(CONFIG_ARCH_BCM_CYGNUS)	+= clk-cygnus.o
diff --git a/drivers/clk/bcm/clk-cygnus.c b/drivers/clk/bcm/clk-cygnus.c
new file mode 100644
index 0000000..f603d1d
--- /dev/null
+++ b/drivers/clk/bcm/clk-cygnus.c
@@ -0,0 +1,277 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include <dt-bindings/clock/bcm-cygnus.h>
+#include "clk-iproc.h"
+
+#define reg_val(o, s, w) { .offset = o, .shift = s, .width = w, }
+
+#define aon_val(o, pw, ps, is) { .offset = o, .pwr_width = pw, \
+	.pwr_shift = ps, .iso_shift = is }
+
+#define asiu_div_val(o, es, hs, hw, ls, lw) \
+		{ .offset = o, .en_shift = es, .high_shift = hs, \
+		.high_width = hw, .low_shift = ls, .low_width = lw }
+
+#define reset_val(o, rs, prs, kis, kiw, kps, kpw, kas, kaw) { .offset = o, \
+	.reset_shift = rs, .p_reset_shift = prs, .ki_shift = kis, \
+	.ki_width = kiw, .kp_shift = kps, .kp_width = kpw, .ka_shift = kas, \
+	.ka_width = kaw }
+
+#define vco_ctrl_val(uo, lo) { .u_offset = uo, .l_offset = lo }
+
+#define enable_val(o, es, hs, bs) { .offset = o, .enable_shift = es, \
+	.hold_shift = hs, .bypass_shift = bs }
+
+#define asiu_gate_val(o, es) { .offset = o, .en_shift = es }
+
+static const struct iproc_pll_ctrl genpll = {
+	.flags = IPROC_CLK_AON | IPROC_CLK_PLL_HAS_NDIV_FRAC,
+	.aon = aon_val(0x0, 2, 1, 0),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 3),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static const struct iproc_pll_ctrl lcpll0 = {
+	.flags = IPROC_CLK_AON,
+	.aon = aon_val(0x0, 2, 5, 4),
+	.reset = reset_val(0x0, 31, 30, 27, 3, 23, 4, 19, 4),
+	.ndiv_int = reg_val(0x4, 16, 10),
+	.pdiv = reg_val(0x4, 26, 4),
+	.vco_ctrl = vco_ctrl_val(0x10, 0x14),
+	.status = reg_val(0x18, 12, 1),
+};
+
+/*
+ * MIPI PLL VCO frequency parameter table
+ */
+static const struct iproc_pll_vco_freq_param mipipll_vco_params[] = {
+	/* rate (Hz) ndiv_int ndiv_frac pdiv */
+	{ 750000000UL,   30,     0,        1 },
+	{ 1000000000UL,  40,     0,        1 },
+	{ 1350000000ul,  54,     0,        1 },
+	{ 2000000000UL,  80,     0,        1 },
+	{ 2100000000UL,  84,     0,        1 },
+	{ 2250000000UL,  90,     0,        1 },
+	{ 2500000000UL,  100,    0,        1 },
+	{ 2700000000UL,  54,     0,        0 },
+	{ 2975000000UL,  119,    0,        1 },
+	{ 3100000000UL,  124,    0,        1 },
+	{ 3150000000UL,  126,    0,        1 },
+};
+
+static const struct iproc_pll_ctrl mipipll = {
+	.flags = IPROC_CLK_PLL_ASIU | IPROC_CLK_PLL_HAS_NDIV_FRAC,
+	.aon = aon_val(0x0, 4, 17, 16),
+	.asiu = asiu_gate_val(0x0, 3),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 4),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static const struct iproc_clk_ctrl genpll_clk[BCM_CYGNUS_NUM_GENPLL_CLKS] = {
+	[BCM_CYGNUS_GENPLL_AXI21_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AXI21_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 6, 0, 12),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_250MHZ_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_250MHZ_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 7, 1, 13),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_IHOST_SYS_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_IHOST_SYS_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 8, 2, 14),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_GENPLL_ENET_SW_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_ENET_SW_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 9, 3, 15),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_AUDIO_125_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AUDIO_125_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 10, 4, 16),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_CAN_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_CAN_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 11, 5, 17),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static const struct iproc_clk_ctrl lcpll0_clk[BCM_CYGNUS_NUM_LCPLL0_CLKS] = {
+	[BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 7, 1, 13),
+		.mdiv = reg_val(0x8, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_DDR_PHY_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_DDR_PHY_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 8, 2, 14),
+		.mdiv = reg_val(0x8, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SDIO_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SDIO_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 9, 3, 15),
+		.mdiv = reg_val(0x8, 20, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 10, 4, 16),
+		.mdiv = reg_val(0xc, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SMART_CARD_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SMART_CARD_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 11, 5, 17),
+		.mdiv = reg_val(0xc, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_LCPLL0_CH5_UNUSED,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 12, 6, 18),
+		.mdiv = reg_val(0xc, 20, 8),
+	},
+};
+
+static const struct iproc_clk_ctrl mipipll_clk[BCM_CYGNUS_NUM_MIPIPLL_CLKS] = {
+	[BCM_CYGNUS_MIPIPLL_CH0_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH0_UNUSED,
+		.enable = enable_val(0x4, 12, 6, 18),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH1_LCD] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH1_LCD,
+		.enable = enable_val(0x4, 13, 7, 19),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH2_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH2_UNUSED,
+		.enable = enable_val(0x4, 14, 8, 20),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH3_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH3_UNUSED,
+		.enable = enable_val(0x4, 15, 9, 21),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH4_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH4_UNUSED,
+		.enable = enable_val(0x4, 16, 10, 22),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH5_UNUSED,
+		.enable = enable_val(0x4, 17, 11, 23),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static const struct iproc_asiu_div asiu_div[BCM_CYGNUS_NUM_ASIU_CLKS] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
+		asiu_div_val(0x0, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_ADC_CLK] =
+		asiu_div_val(0x4, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_PWM_CLK] =
+		asiu_div_val(0x8, 31, 16, 10, 0, 10),
+};
+
+static const struct iproc_asiu_gate asiu_gate[BCM_CYGNUS_NUM_ASIU_CLKS] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
+		asiu_gate_val(0x0, 7),
+	[BCM_CYGNUS_ASIU_ADC_CLK] =
+		asiu_gate_val(0x0, 9),
+	[BCM_CYGNUS_ASIU_PWM_CLK] =
+		asiu_gate_val(IPROC_CLK_INVALID_OFFSET, 0),
+};
+
+static void __init cygnus_armpll_init(struct device_node *node)
+{
+	iproc_armpll_setup(node);
+}
+CLK_OF_DECLARE(cygnus_armpll, "brcm,cygnus-armpll", cygnus_armpll_init);
+
+static void __init cygnus_genpll_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &genpll, NULL, 0);
+}
+CLK_OF_DECLARE(cygnus_genpll, "brcm,cygnus-genpll", cygnus_genpll_init);
+
+static void __init cygnus_lcpll0_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &lcpll0, NULL, 0);
+}
+CLK_OF_DECLARE(cygnus_lcpll0, "brcm,cygnus-lcpll0", cygnus_lcpll0_init);
+
+static void __init cygnus_mipipll_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &mipipll, mipipll_vco_params,
+			ARRAY_SIZE(mipipll_vco_params));
+}
+CLK_OF_DECLARE(cygnus_mipipll, "brcm,cygnus-mipipll", cygnus_mipipll_init);
+
+static void __init cygnus_genpll_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, genpll_clk, BCM_CYGNUS_NUM_GENPLL_CLKS);
+}
+CLK_OF_DECLARE(cygnus_genpll_clk, "brcm,cygnus-genpll-clk",
+		cygnus_genpll_clk_init);
+
+static void __init cygnus_lcpll0_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, lcpll0_clk, BCM_CYGNUS_NUM_LCPLL0_CLKS);
+}
+CLK_OF_DECLARE(cygnus_lcpll0_clk, "brcm,cygnus-lcpll0-clk",
+		cygnus_lcpll0_clk_init);
+
+static void __init cygnus_mipipll_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, mipipll_clk, BCM_CYGNUS_NUM_MIPIPLL_CLKS);
+}
+CLK_OF_DECLARE(cygnus_mipipll_clk, "brcm,cygnus-mipipll-clk",
+		cygnus_mipipll_clk_init);
+
+static void __init cygnus_asiu_init(struct device_node *node)
+{
+	iproc_asiu_setup(node, asiu_div, asiu_gate, BCM_CYGNUS_NUM_ASIU_CLKS);
+}
+CLK_OF_DECLARE(cygnus_asiu_clk, "brcm,cygnus-asiu-clk", cygnus_asiu_init);
diff --git a/include/dt-bindings/clock/bcm-cygnus.h b/include/dt-bindings/clock/bcm-cygnus.h
new file mode 100644
index 0000000..45948b6
--- /dev/null
+++ b/include/dt-bindings/clock/bcm-cygnus.h
@@ -0,0 +1,77 @@
+/*
+ *  BSD LICENSE
+ *
+ *  Copyright(c) 2014 Broadcom Corporation.  All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in
+ *      the documentation and/or other materials provided with the
+ *      distribution.
+ *    * Neither the name of Broadcom Corporation nor the names of its
+ *      contributors may be used to endorse or promote products derived
+ *      from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _CLOCK_BCM_CYGNUS_H
+#define _CLOCK_BCM_CYGNUS_H
+
+/* number of GENPLL clocks */
+#define BCM_CYGNUS_NUM_GENPLL_CLKS 6
+
+/* GENPLL clock channel ID */
+#define BCM_CYGNUS_GENPLL_AXI21_CLK          0
+#define BCM_CYGNUS_GENPLL_250MHZ_CLK         1
+#define BCM_CYGNUS_GENPLL_IHOST_SYS_CLK      2
+#define BCM_CYGNUS_GENPLL_ENET_SW_CLK        3
+#define BCM_CYGNUS_GENPLL_AUDIO_125_CLK      4
+#define BCM_CYGNUS_GENPLL_CAN_CLK            5
+
+/* number of LCPLL0 clocks */
+#define BCM_CYGNUS_NUM_LCPLL0_CLKS 6
+
+/* LCPLL0 clock channel ID */
+#define BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK    0
+#define BCM_CYGNUS_LCPLL0_DDR_PHY_CLK         1
+#define BCM_CYGNUS_LCPLL0_SDIO_CLK            2
+#define BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK     3
+#define BCM_CYGNUS_LCPLL0_SMART_CARD_CLK      4
+#define BCM_CYGNUS_LCPLL0_CH5_UNUSED          5
+
+/* number of MIPI PLL clocks */
+#define BCM_CYGNUS_NUM_MIPIPLL_CLKS 6
+
+/* MIPI PLL clock channel ID */
+#define BCM_CYGNUS_MIPIPLL_CH0_UNUSED         0
+#define BCM_CYGNUS_MIPIPLL_CH1_LCD            1
+#define BCM_CYGNUS_MIPIPLL_CH2_UNUSED         2
+#define BCM_CYGNUS_MIPIPLL_CH3_UNUSED         3
+#define BCM_CYGNUS_MIPIPLL_CH4_UNUSED         4
+#define BCM_CYGNUS_MIPIPLL_CH5_UNUSED         5
+
+/* number of ASIU clocks */
+#define BCM_CYGNUS_NUM_ASIU_CLKS 3
+
+/* ASIU clock IDs */
+#define BCM_CYGNUS_ASIU_KEYPAD_CLK    0
+#define BCM_CYGNUS_ASIU_ADC_CLK       1
+#define BCM_CYGNUS_ASIU_PWM_CLK       2
+
+#endif /* _CLOCK_BCM_CYGNUS_H */
-- 
1.7.9.5

[PATCH v2 4/5] clk: cygnus: add clock support for Broadcom Cygnus

[Ray Jui]

The Broadcom Cygnus SoC is architected under the iProc architecture. It
has the following PLLs: ARMPLL, GENPLL, LCPLL0, MIPIPLL, all dervied
from an onboard crystal. Cygnus also has various ASIU clocks that are
derived directly from the onboard crystal.

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/clk/bcm/Makefile               |    1 +
 drivers/clk/bcm/clk-cygnus.c           |  277 ++++++++++++++++++++++++++++++++
 include/dt-bindings/clock/bcm-cygnus.h |   77 +++++++++
 3 files changed, 355 insertions(+)
 create mode 100644 drivers/clk/bcm/clk-cygnus.c
 create mode 100644 include/dt-bindings/clock/bcm-cygnus.h

diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
index 6926636..afcbe55 100644
--- a/drivers/clk/bcm/Makefile
+++ b/drivers/clk/bcm/Makefile
@@ -3,3 +3,4 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
 obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
+obj-$(CONFIG_ARCH_BCM_CYGNUS)	+= clk-cygnus.o
diff --git a/drivers/clk/bcm/clk-cygnus.c b/drivers/clk/bcm/clk-cygnus.c
new file mode 100644
index 0000000..f603d1d
--- /dev/null
+++ b/drivers/clk/bcm/clk-cygnus.c
@@ -0,0 +1,277 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include <dt-bindings/clock/bcm-cygnus.h>
+#include "clk-iproc.h"
+
+#define reg_val(o, s, w) { .offset = o, .shift = s, .width = w, }
+
+#define aon_val(o, pw, ps, is) { .offset = o, .pwr_width = pw, \
+	.pwr_shift = ps, .iso_shift = is }
+
+#define asiu_div_val(o, es, hs, hw, ls, lw) \
+		{ .offset = o, .en_shift = es, .high_shift = hs, \
+		.high_width = hw, .low_shift = ls, .low_width = lw }
+
+#define reset_val(o, rs, prs, kis, kiw, kps, kpw, kas, kaw) { .offset = o, \
+	.reset_shift = rs, .p_reset_shift = prs, .ki_shift = kis, \
+	.ki_width = kiw, .kp_shift = kps, .kp_width = kpw, .ka_shift = kas, \
+	.ka_width = kaw }
+
+#define vco_ctrl_val(uo, lo) { .u_offset = uo, .l_offset = lo }
+
+#define enable_val(o, es, hs, bs) { .offset = o, .enable_shift = es, \
+	.hold_shift = hs, .bypass_shift = bs }
+
+#define asiu_gate_val(o, es) { .offset = o, .en_shift = es }
+
+static const struct iproc_pll_ctrl genpll = {
+	.flags = IPROC_CLK_AON | IPROC_CLK_PLL_HAS_NDIV_FRAC,
+	.aon = aon_val(0x0, 2, 1, 0),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 3),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static const struct iproc_pll_ctrl lcpll0 = {
+	.flags = IPROC_CLK_AON,
+	.aon = aon_val(0x0, 2, 5, 4),
+	.reset = reset_val(0x0, 31, 30, 27, 3, 23, 4, 19, 4),
+	.ndiv_int = reg_val(0x4, 16, 10),
+	.pdiv = reg_val(0x4, 26, 4),
+	.vco_ctrl = vco_ctrl_val(0x10, 0x14),
+	.status = reg_val(0x18, 12, 1),
+};
+
+/*
+ * MIPI PLL VCO frequency parameter table
+ */
+static const struct iproc_pll_vco_freq_param mipipll_vco_params[] = {
+	/* rate (Hz) ndiv_int ndiv_frac pdiv */
+	{ 750000000UL,   30,     0,        1 },
+	{ 1000000000UL,  40,     0,        1 },
+	{ 1350000000ul,  54,     0,        1 },
+	{ 2000000000UL,  80,     0,        1 },
+	{ 2100000000UL,  84,     0,        1 },
+	{ 2250000000UL,  90,     0,        1 },
+	{ 2500000000UL,  100,    0,        1 },
+	{ 2700000000UL,  54,     0,        0 },
+	{ 2975000000UL,  119,    0,        1 },
+	{ 3100000000UL,  124,    0,        1 },
+	{ 3150000000UL,  126,    0,        1 },
+};
+
+static const struct iproc_pll_ctrl mipipll = {
+	.flags = IPROC_CLK_PLL_ASIU | IPROC_CLK_PLL_HAS_NDIV_FRAC,
+	.aon = aon_val(0x0, 4, 17, 16),
+	.asiu = asiu_gate_val(0x0, 3),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 4),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static const struct iproc_clk_ctrl genpll_clk[BCM_CYGNUS_NUM_GENPLL_CLKS] = {
+	[BCM_CYGNUS_GENPLL_AXI21_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AXI21_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 6, 0, 12),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_250MHZ_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_250MHZ_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 7, 1, 13),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_IHOST_SYS_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_IHOST_SYS_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 8, 2, 14),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_GENPLL_ENET_SW_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_ENET_SW_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 9, 3, 15),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_AUDIO_125_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AUDIO_125_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 10, 4, 16),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_CAN_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_CAN_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 11, 5, 17),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static const struct iproc_clk_ctrl lcpll0_clk[BCM_CYGNUS_NUM_LCPLL0_CLKS] = {
+	[BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 7, 1, 13),
+		.mdiv = reg_val(0x8, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_DDR_PHY_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_DDR_PHY_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 8, 2, 14),
+		.mdiv = reg_val(0x8, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SDIO_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SDIO_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 9, 3, 15),
+		.mdiv = reg_val(0x8, 20, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 10, 4, 16),
+		.mdiv = reg_val(0xc, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SMART_CARD_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SMART_CARD_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 11, 5, 17),
+		.mdiv = reg_val(0xc, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_LCPLL0_CH5_UNUSED,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 12, 6, 18),
+		.mdiv = reg_val(0xc, 20, 8),
+	},
+};
+
+static const struct iproc_clk_ctrl mipipll_clk[BCM_CYGNUS_NUM_MIPIPLL_CLKS] = {
+	[BCM_CYGNUS_MIPIPLL_CH0_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH0_UNUSED,
+		.enable = enable_val(0x4, 12, 6, 18),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH1_LCD] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH1_LCD,
+		.enable = enable_val(0x4, 13, 7, 19),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH2_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH2_UNUSED,
+		.enable = enable_val(0x4, 14, 8, 20),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH3_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH3_UNUSED,
+		.enable = enable_val(0x4, 15, 9, 21),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH4_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH4_UNUSED,
+		.enable = enable_val(0x4, 16, 10, 22),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH5_UNUSED,
+		.enable = enable_val(0x4, 17, 11, 23),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static const struct iproc_asiu_div asiu_div[BCM_CYGNUS_NUM_ASIU_CLKS] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
+		asiu_div_val(0x0, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_ADC_CLK] =
+		asiu_div_val(0x4, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_PWM_CLK] =
+		asiu_div_val(0x8, 31, 16, 10, 0, 10),
+};
+
+static const struct iproc_asiu_gate asiu_gate[BCM_CYGNUS_NUM_ASIU_CLKS] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
+		asiu_gate_val(0x0, 7),
+	[BCM_CYGNUS_ASIU_ADC_CLK] =
+		asiu_gate_val(0x0, 9),
+	[BCM_CYGNUS_ASIU_PWM_CLK] =
+		asiu_gate_val(IPROC_CLK_INVALID_OFFSET, 0),
+};
+
+static void __init cygnus_armpll_init(struct device_node *node)
+{
+	iproc_armpll_setup(node);
+}
+CLK_OF_DECLARE(cygnus_armpll, "brcm,cygnus-armpll", cygnus_armpll_init);
+
+static void __init cygnus_genpll_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &genpll, NULL, 0);
+}
+CLK_OF_DECLARE(cygnus_genpll, "brcm,cygnus-genpll", cygnus_genpll_init);
+
+static void __init cygnus_lcpll0_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &lcpll0, NULL, 0);
+}
+CLK_OF_DECLARE(cygnus_lcpll0, "brcm,cygnus-lcpll0", cygnus_lcpll0_init);
+
+static void __init cygnus_mipipll_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &mipipll, mipipll_vco_params,
+			ARRAY_SIZE(mipipll_vco_params));
+}
+CLK_OF_DECLARE(cygnus_mipipll, "brcm,cygnus-mipipll", cygnus_mipipll_init);
+
+static void __init cygnus_genpll_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, genpll_clk, BCM_CYGNUS_NUM_GENPLL_CLKS);
+}
+CLK_OF_DECLARE(cygnus_genpll_clk, "brcm,cygnus-genpll-clk",
+		cygnus_genpll_clk_init);
+
+static void __init cygnus_lcpll0_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, lcpll0_clk, BCM_CYGNUS_NUM_LCPLL0_CLKS);
+}
+CLK_OF_DECLARE(cygnus_lcpll0_clk, "brcm,cygnus-lcpll0-clk",
+		cygnus_lcpll0_clk_init);
+
+static void __init cygnus_mipipll_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, mipipll_clk, BCM_CYGNUS_NUM_MIPIPLL_CLKS);
+}
+CLK_OF_DECLARE(cygnus_mipipll_clk, "brcm,cygnus-mipipll-clk",
+		cygnus_mipipll_clk_init);
+
+static void __init cygnus_asiu_init(struct device_node *node)
+{
+	iproc_asiu_setup(node, asiu_div, asiu_gate, BCM_CYGNUS_NUM_ASIU_CLKS);
+}
+CLK_OF_DECLARE(cygnus_asiu_clk, "brcm,cygnus-asiu-clk", cygnus_asiu_init);
diff --git a/include/dt-bindings/clock/bcm-cygnus.h b/include/dt-bindings/clock/bcm-cygnus.h
new file mode 100644
index 0000000..45948b6
--- /dev/null
+++ b/include/dt-bindings/clock/bcm-cygnus.h
@@ -0,0 +1,77 @@
+/*
+ *  BSD LICENSE
+ *
+ *  Copyright(c) 2014 Broadcom Corporation.  All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in
+ *      the documentation and/or other materials provided with the
+ *      distribution.
+ *    * Neither the name of Broadcom Corporation nor the names of its
+ *      contributors may be used to endorse or promote products derived
+ *      from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _CLOCK_BCM_CYGNUS_H
+#define _CLOCK_BCM_CYGNUS_H
+
+/* number of GENPLL clocks */
+#define BCM_CYGNUS_NUM_GENPLL_CLKS 6
+
+/* GENPLL clock channel ID */
+#define BCM_CYGNUS_GENPLL_AXI21_CLK          0
+#define BCM_CYGNUS_GENPLL_250MHZ_CLK         1
+#define BCM_CYGNUS_GENPLL_IHOST_SYS_CLK      2
+#define BCM_CYGNUS_GENPLL_ENET_SW_CLK        3
+#define BCM_CYGNUS_GENPLL_AUDIO_125_CLK      4
+#define BCM_CYGNUS_GENPLL_CAN_CLK            5
+
+/* number of LCPLL0 clocks */
+#define BCM_CYGNUS_NUM_LCPLL0_CLKS 6
+
+/* LCPLL0 clock channel ID */
+#define BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK    0
+#define BCM_CYGNUS_LCPLL0_DDR_PHY_CLK         1
+#define BCM_CYGNUS_LCPLL0_SDIO_CLK            2
+#define BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK     3
+#define BCM_CYGNUS_LCPLL0_SMART_CARD_CLK      4
+#define BCM_CYGNUS_LCPLL0_CH5_UNUSED          5
+
+/* number of MIPI PLL clocks */
+#define BCM_CYGNUS_NUM_MIPIPLL_CLKS 6
+
+/* MIPI PLL clock channel ID */
+#define BCM_CYGNUS_MIPIPLL_CH0_UNUSED         0
+#define BCM_CYGNUS_MIPIPLL_CH1_LCD            1
+#define BCM_CYGNUS_MIPIPLL_CH2_UNUSED         2
+#define BCM_CYGNUS_MIPIPLL_CH3_UNUSED         3
+#define BCM_CYGNUS_MIPIPLL_CH4_UNUSED         4
+#define BCM_CYGNUS_MIPIPLL_CH5_UNUSED         5
+
+/* number of ASIU clocks */
+#define BCM_CYGNUS_NUM_ASIU_CLKS 3
+
+/* ASIU clock IDs */
+#define BCM_CYGNUS_ASIU_KEYPAD_CLK    0
+#define BCM_CYGNUS_ASIU_ADC_CLK       1
+#define BCM_CYGNUS_ASIU_PWM_CLK       2
+
+#endif /* _CLOCK_BCM_CYGNUS_H */
-- 
1.7.9.5

[PATCH v2 4/5] clk: cygnus: add clock support for Broadcom Cygnus

[Ray Jui]

The Broadcom Cygnus SoC is architected under the iProc architecture. It
has the following PLLs: ARMPLL, GENPLL, LCPLL0, MIPIPLL, all dervied
from an onboard crystal. Cygnus also has various ASIU clocks that are
derived directly from the onboard crystal.

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/clk/bcm/Makefile               |    1 +
 drivers/clk/bcm/clk-cygnus.c           |  277 ++++++++++++++++++++++++++++++++
 include/dt-bindings/clock/bcm-cygnus.h |   77 +++++++++
 3 files changed, 355 insertions(+)
 create mode 100644 drivers/clk/bcm/clk-cygnus.c
 create mode 100644 include/dt-bindings/clock/bcm-cygnus.h

diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
index 6926636..afcbe55 100644
--- a/drivers/clk/bcm/Makefile
+++ b/drivers/clk/bcm/Makefile
@@ -3,3 +3,4 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
 obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
+obj-$(CONFIG_ARCH_BCM_CYGNUS)	+= clk-cygnus.o
diff --git a/drivers/clk/bcm/clk-cygnus.c b/drivers/clk/bcm/clk-cygnus.c
new file mode 100644
index 0000000..f603d1d
--- /dev/null
+++ b/drivers/clk/bcm/clk-cygnus.c
@@ -0,0 +1,277 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include <dt-bindings/clock/bcm-cygnus.h>
+#include "clk-iproc.h"
+
+#define reg_val(o, s, w) { .offset = o, .shift = s, .width = w, }
+
+#define aon_val(o, pw, ps, is) { .offset = o, .pwr_width = pw, \
+	.pwr_shift = ps, .iso_shift = is }
+
+#define asiu_div_val(o, es, hs, hw, ls, lw) \
+		{ .offset = o, .en_shift = es, .high_shift = hs, \
+		.high_width = hw, .low_shift = ls, .low_width = lw }
+
+#define reset_val(o, rs, prs, kis, kiw, kps, kpw, kas, kaw) { .offset = o, \
+	.reset_shift = rs, .p_reset_shift = prs, .ki_shift = kis, \
+	.ki_width = kiw, .kp_shift = kps, .kp_width = kpw, .ka_shift = kas, \
+	.ka_width = kaw }
+
+#define vco_ctrl_val(uo, lo) { .u_offset = uo, .l_offset = lo }
+
+#define enable_val(o, es, hs, bs) { .offset = o, .enable_shift = es, \
+	.hold_shift = hs, .bypass_shift = bs }
+
+#define asiu_gate_val(o, es) { .offset = o, .en_shift = es }
+
+static const struct iproc_pll_ctrl genpll = {
+	.flags = IPROC_CLK_AON | IPROC_CLK_PLL_HAS_NDIV_FRAC,
+	.aon = aon_val(0x0, 2, 1, 0),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 3),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static const struct iproc_pll_ctrl lcpll0 = {
+	.flags = IPROC_CLK_AON,
+	.aon = aon_val(0x0, 2, 5, 4),
+	.reset = reset_val(0x0, 31, 30, 27, 3, 23, 4, 19, 4),
+	.ndiv_int = reg_val(0x4, 16, 10),
+	.pdiv = reg_val(0x4, 26, 4),
+	.vco_ctrl = vco_ctrl_val(0x10, 0x14),
+	.status = reg_val(0x18, 12, 1),
+};
+
+/*
+ * MIPI PLL VCO frequency parameter table
+ */
+static const struct iproc_pll_vco_freq_param mipipll_vco_params[] = {
+	/* rate (Hz) ndiv_int ndiv_frac pdiv */
+	{ 750000000UL,   30,     0,        1 },
+	{ 1000000000UL,  40,     0,        1 },
+	{ 1350000000ul,  54,     0,        1 },
+	{ 2000000000UL,  80,     0,        1 },
+	{ 2100000000UL,  84,     0,        1 },
+	{ 2250000000UL,  90,     0,        1 },
+	{ 2500000000UL,  100,    0,        1 },
+	{ 2700000000UL,  54,     0,        0 },
+	{ 2975000000UL,  119,    0,        1 },
+	{ 3100000000UL,  124,    0,        1 },
+	{ 3150000000UL,  126,    0,        1 },
+};
+
+static const struct iproc_pll_ctrl mipipll = {
+	.flags = IPROC_CLK_PLL_ASIU | IPROC_CLK_PLL_HAS_NDIV_FRAC,
+	.aon = aon_val(0x0, 4, 17, 16),
+	.asiu = asiu_gate_val(0x0, 3),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 4),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static const struct iproc_clk_ctrl genpll_clk[BCM_CYGNUS_NUM_GENPLL_CLKS] = {
+	[BCM_CYGNUS_GENPLL_AXI21_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AXI21_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 6, 0, 12),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_250MHZ_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_250MHZ_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 7, 1, 13),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_IHOST_SYS_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_IHOST_SYS_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 8, 2, 14),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_GENPLL_ENET_SW_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_ENET_SW_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 9, 3, 15),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_AUDIO_125_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AUDIO_125_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 10, 4, 16),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_CAN_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_CAN_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 11, 5, 17),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static const struct iproc_clk_ctrl lcpll0_clk[BCM_CYGNUS_NUM_LCPLL0_CLKS] = {
+	[BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 7, 1, 13),
+		.mdiv = reg_val(0x8, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_DDR_PHY_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_DDR_PHY_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 8, 2, 14),
+		.mdiv = reg_val(0x8, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SDIO_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SDIO_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 9, 3, 15),
+		.mdiv = reg_val(0x8, 20, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 10, 4, 16),
+		.mdiv = reg_val(0xc, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SMART_CARD_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SMART_CARD_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 11, 5, 17),
+		.mdiv = reg_val(0xc, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_LCPLL0_CH5_UNUSED,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 12, 6, 18),
+		.mdiv = reg_val(0xc, 20, 8),
+	},
+};
+
+static const struct iproc_clk_ctrl mipipll_clk[BCM_CYGNUS_NUM_MIPIPLL_CLKS] = {
+	[BCM_CYGNUS_MIPIPLL_CH0_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH0_UNUSED,
+		.enable = enable_val(0x4, 12, 6, 18),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH1_LCD] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH1_LCD,
+		.enable = enable_val(0x4, 13, 7, 19),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH2_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH2_UNUSED,
+		.enable = enable_val(0x4, 14, 8, 20),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH3_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH3_UNUSED,
+		.enable = enable_val(0x4, 15, 9, 21),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH4_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH4_UNUSED,
+		.enable = enable_val(0x4, 16, 10, 22),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH5_UNUSED,
+		.enable = enable_val(0x4, 17, 11, 23),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static const struct iproc_asiu_div asiu_div[BCM_CYGNUS_NUM_ASIU_CLKS] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
+		asiu_div_val(0x0, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_ADC_CLK] =
+		asiu_div_val(0x4, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_PWM_CLK] =
+		asiu_div_val(0x8, 31, 16, 10, 0, 10),
+};
+
+static const struct iproc_asiu_gate asiu_gate[BCM_CYGNUS_NUM_ASIU_CLKS] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
+		asiu_gate_val(0x0, 7),
+	[BCM_CYGNUS_ASIU_ADC_CLK] =
+		asiu_gate_val(0x0, 9),
+	[BCM_CYGNUS_ASIU_PWM_CLK] =
+		asiu_gate_val(IPROC_CLK_INVALID_OFFSET, 0),
+};
+
+static void __init cygnus_armpll_init(struct device_node *node)
+{
+	iproc_armpll_setup(node);
+}
+CLK_OF_DECLARE(cygnus_armpll, "brcm,cygnus-armpll", cygnus_armpll_init);
+
+static void __init cygnus_genpll_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &genpll, NULL, 0);
+}
+CLK_OF_DECLARE(cygnus_genpll, "brcm,cygnus-genpll", cygnus_genpll_init);
+
+static void __init cygnus_lcpll0_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &lcpll0, NULL, 0);
+}
+CLK_OF_DECLARE(cygnus_lcpll0, "brcm,cygnus-lcpll0", cygnus_lcpll0_init);
+
+static void __init cygnus_mipipll_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &mipipll, mipipll_vco_params,
+			ARRAY_SIZE(mipipll_vco_params));
+}
+CLK_OF_DECLARE(cygnus_mipipll, "brcm,cygnus-mipipll", cygnus_mipipll_init);
+
+static void __init cygnus_genpll_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, genpll_clk, BCM_CYGNUS_NUM_GENPLL_CLKS);
+}
+CLK_OF_DECLARE(cygnus_genpll_clk, "brcm,cygnus-genpll-clk",
+		cygnus_genpll_clk_init);
+
+static void __init cygnus_lcpll0_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, lcpll0_clk, BCM_CYGNUS_NUM_LCPLL0_CLKS);
+}
+CLK_OF_DECLARE(cygnus_lcpll0_clk, "brcm,cygnus-lcpll0-clk",
+		cygnus_lcpll0_clk_init);
+
+static void __init cygnus_mipipll_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, mipipll_clk, BCM_CYGNUS_NUM_MIPIPLL_CLKS);
+}
+CLK_OF_DECLARE(cygnus_mipipll_clk, "brcm,cygnus-mipipll-clk",
+		cygnus_mipipll_clk_init);
+
+static void __init cygnus_asiu_init(struct device_node *node)
+{
+	iproc_asiu_setup(node, asiu_div, asiu_gate, BCM_CYGNUS_NUM_ASIU_CLKS);
+}
+CLK_OF_DECLARE(cygnus_asiu_clk, "brcm,cygnus-asiu-clk", cygnus_asiu_init);
diff --git a/include/dt-bindings/clock/bcm-cygnus.h b/include/dt-bindings/clock/bcm-cygnus.h
new file mode 100644
index 0000000..45948b6
--- /dev/null
+++ b/include/dt-bindings/clock/bcm-cygnus.h
@@ -0,0 +1,77 @@
+/*
+ *  BSD LICENSE
+ *
+ *  Copyright(c) 2014 Broadcom Corporation.  All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in
+ *      the documentation and/or other materials provided with the
+ *      distribution.
+ *    * Neither the name of Broadcom Corporation nor the names of its
+ *      contributors may be used to endorse or promote products derived
+ *      from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _CLOCK_BCM_CYGNUS_H
+#define _CLOCK_BCM_CYGNUS_H
+
+/* number of GENPLL clocks */
+#define BCM_CYGNUS_NUM_GENPLL_CLKS 6
+
+/* GENPLL clock channel ID */
+#define BCM_CYGNUS_GENPLL_AXI21_CLK          0
+#define BCM_CYGNUS_GENPLL_250MHZ_CLK         1
+#define BCM_CYGNUS_GENPLL_IHOST_SYS_CLK      2
+#define BCM_CYGNUS_GENPLL_ENET_SW_CLK        3
+#define BCM_CYGNUS_GENPLL_AUDIO_125_CLK      4
+#define BCM_CYGNUS_GENPLL_CAN_CLK            5
+
+/* number of LCPLL0 clocks */
+#define BCM_CYGNUS_NUM_LCPLL0_CLKS 6
+
+/* LCPLL0 clock channel ID */
+#define BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK    0
+#define BCM_CYGNUS_LCPLL0_DDR_PHY_CLK         1
+#define BCM_CYGNUS_LCPLL0_SDIO_CLK            2
+#define BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK     3
+#define BCM_CYGNUS_LCPLL0_SMART_CARD_CLK      4
+#define BCM_CYGNUS_LCPLL0_CH5_UNUSED          5
+
+/* number of MIPI PLL clocks */
+#define BCM_CYGNUS_NUM_MIPIPLL_CLKS 6
+
+/* MIPI PLL clock channel ID */
+#define BCM_CYGNUS_MIPIPLL_CH0_UNUSED         0
+#define BCM_CYGNUS_MIPIPLL_CH1_LCD            1
+#define BCM_CYGNUS_MIPIPLL_CH2_UNUSED         2
+#define BCM_CYGNUS_MIPIPLL_CH3_UNUSED         3
+#define BCM_CYGNUS_MIPIPLL_CH4_UNUSED         4
+#define BCM_CYGNUS_MIPIPLL_CH5_UNUSED         5
+
+/* number of ASIU clocks */
+#define BCM_CYGNUS_NUM_ASIU_CLKS 3
+
+/* ASIU clock IDs */
+#define BCM_CYGNUS_ASIU_KEYPAD_CLK    0
+#define BCM_CYGNUS_ASIU_ADC_CLK       1
+#define BCM_CYGNUS_ASIU_PWM_CLK       2
+
+#endif /* _CLOCK_BCM_CYGNUS_H */
-- 
1.7.9.5

[PATCH v2 5/5] ARM: dts: enable clock support for Broadcom Cygnus

[Ray Jui]

Replace current device tree dummy clocks with real clock support for
Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbraden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus-clock.dtsi |  110 ++++++++++++++++++++++++-------
 arch/arm/boot/dts/bcm-cygnus.dtsi       |    2 +-
 2 files changed, 86 insertions(+), 26 deletions(-)

diff --git a/arch/arm/boot/dts/bcm-cygnus-clock.dtsi b/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
index 60d8389..f2da5e2 100644
--- a/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
@@ -36,56 +36,116 @@ clocks {
 	ranges;
 
 	osc: oscillator {
+		#clock-cells = <0>;
 		compatible = "fixed-clock";
-		#clock-cells = <1>;
 		clock-frequency = <25000000>;
 	};
 
-	apb_clk: apb_clk {
-		compatible = "fixed-clock";
+	/* Cygnus ARM PLL */
+	armpll: armpll {
 		#clock-cells = <0>;
-		clock-frequency = <1000000000>;
+		compatible = "brcm,cygnus-armpll";
+		clocks = <&osc>;
+		reg = <0x19000000 0x1000>;
 	};
 
-	periph_clk: periph_clk {
-		compatible = "fixed-clock";
+	/* peripheral clock for system timer */
+	arm_periph_clk: arm_periph_clk {
 		#clock-cells = <0>;
-		clock-frequency = <500000000>;
+		compatible = "fixed-factor-clock";
+		clocks = <&armpll>;
+		clock-div = <2>;
+		clock-mult = <1>;
 	};
 
-	sdio_clk: lcpll_ch2 {
-		compatible = "fixed-clock";
+	/* APB bus clock */
+	apb_clk: apb_clk {
 		#clock-cells = <0>;
-		clock-frequency = <200000000>;
+		compatible = "fixed-factor-clock";
+		clocks = <&armpll>;
+		clock-div = <4>;
+		clock-mult = <1>;
 	};
 
-	axi81_clk: axi81_clk {
-		compatible = "fixed-clock";
+	genpll: genpll {
 		#clock-cells = <0>;
-		clock-frequency = <100000000>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
 	};
 
-	keypad_clk: keypad_clk {
-		compatible = "fixed-clock";
+	/* various clocks running off the GENPLL */
+	genpll_clks: genpll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-genpll-clk";
+		reg = <0x0301d000 0x2c>;
+		clocks = <&genpll>;
+		clock-output-names = "axi21", "250mhz", "ihost_sys",
+			"enet_sw", "audio_125", "can";
+	};
+
+	/* always 1/2 of the axi21 clock */
+	axi41_clk: axi41_clk {
 		#clock-cells = <0>;
-		clock-frequency = <31806>;
+		compatible = "fixed-factor-clock";
+		clocks = <&genpll_clks 0>;
+		clock-div = <2>;
+		clock-mult = <1>;
 	};
 
-	adc_clk: adc_clk {
-		compatible = "fixed-clock";
+	/* always 1/4 of the axi21 clock */
+	axi81_clk: axi81_clk {
 		#clock-cells = <0>;
-		clock-frequency = <1562500>;
+		compatible = "fixed-factor-clock";
+		clocks = <&genpll_clks 0>;
+		clock-div = <4>;
+		clock-mult = <1>;
 	};
 
-	pwm_clk: pwm_clk {
-		compatible = "fixed-clock";
+	lcpll0: lcpll0 {
 		#clock-cells = <0>;
-		clock-frequency = <1000000>;
+		compatible = "brcm,cygnus-lcpll0";
+		reg = <0x0301d02c 0x1c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
 	};
 
-	lcd_clk: mipipll_ch1 {
-		compatible = "fixed-clock";
+	/* various clocks running off the LCPLL0 */
+	lcpll0_clks: lcpll0_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-lcpll0-clk";
+		reg = <0x0301d02c 0x1c>;
+		clocks = <&lcpll0>;
+		clock-output-names = "pcie_phy", "ddr_phy", "sdio",
+			"usb_phy", "smart_card", "ch5";
+	};
+
+	mipipll: mipipll {
 		#clock-cells = <0>;
-		clock-frequency = <100000000>;
+		compatible = "brcm,cygnus-mipipll";
+		reg = <0x180a9800 0x2c>,
+			<0x0301c020 0x4>,
+			<0x180aa024 0x4>;
+		clock-frequency = <1350000000>;
+		clocks = <&osc>;
+	};
+
+	mipipll_clks: mipipll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-mipipll-clk";
+		reg = <0x180a9800 0x2c>;
+		clocks = <&mipipll>;
+		clock-output-names = "ch0_unused", "ch1_lcd", "ch2_unused",
+			"ch3_unused", "ch4_unused", "ch5_unused";
+	};
+
+	asiu_clks: asiu_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-asiu-clk";
+		reg = <0x0301d048 0xc>,
+			<0x180aa024 0x4>;
+		clocks = <&osc>;
+		clock-output-names = "keypad", "adc/touch", "pwm";
 	};
 };
diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..2b99e9c 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -134,7 +134,7 @@
 		compatible = "arm,cortex-a9-global-timer";
 		reg = <0x19020200 0x100>;
 		interrupts = <GIC_PPI 11 IRQ_TYPE_LEVEL_HIGH>;
-		clocks = <&periph_clk>;
+		clocks = <&arm_periph_clk>;
 	};
 
 };
-- 
1.7.9.5

[PATCH v2 5/5] ARM: dts: enable clock support for Broadcom Cygnus

[Ray Jui]

Replace current device tree dummy clocks with real clock support for
Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbraden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus-clock.dtsi |  110 ++++++++++++++++++++++++-------
 arch/arm/boot/dts/bcm-cygnus.dtsi       |    2 +-
 2 files changed, 86 insertions(+), 26 deletions(-)

diff --git a/arch/arm/boot/dts/bcm-cygnus-clock.dtsi b/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
index 60d8389..f2da5e2 100644
--- a/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
@@ -36,56 +36,116 @@ clocks {
 	ranges;
 
 	osc: oscillator {
+		#clock-cells = <0>;
 		compatible = "fixed-clock";
-		#clock-cells = <1>;
 		clock-frequency = <25000000>;
 	};
 
-	apb_clk: apb_clk {
-		compatible = "fixed-clock";
+	/* Cygnus ARM PLL */
+	armpll: armpll {
 		#clock-cells = <0>;
-		clock-frequency = <1000000000>;
+		compatible = "brcm,cygnus-armpll";
+		clocks = <&osc>;
+		reg = <0x19000000 0x1000>;
 	};
 
-	periph_clk: periph_clk {
-		compatible = "fixed-clock";
+	/* peripheral clock for system timer */
+	arm_periph_clk: arm_periph_clk {
 		#clock-cells = <0>;
-		clock-frequency = <500000000>;
+		compatible = "fixed-factor-clock";
+		clocks = <&armpll>;
+		clock-div = <2>;
+		clock-mult = <1>;
 	};
 
-	sdio_clk: lcpll_ch2 {
-		compatible = "fixed-clock";
+	/* APB bus clock */
+	apb_clk: apb_clk {
 		#clock-cells = <0>;
-		clock-frequency = <200000000>;
+		compatible = "fixed-factor-clock";
+		clocks = <&armpll>;
+		clock-div = <4>;
+		clock-mult = <1>;
 	};
 
-	axi81_clk: axi81_clk {
-		compatible = "fixed-clock";
+	genpll: genpll {
 		#clock-cells = <0>;
-		clock-frequency = <100000000>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
 	};
 
-	keypad_clk: keypad_clk {
-		compatible = "fixed-clock";
+	/* various clocks running off the GENPLL */
+	genpll_clks: genpll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-genpll-clk";
+		reg = <0x0301d000 0x2c>;
+		clocks = <&genpll>;
+		clock-output-names = "axi21", "250mhz", "ihost_sys",
+			"enet_sw", "audio_125", "can";
+	};
+
+	/* always 1/2 of the axi21 clock */
+	axi41_clk: axi41_clk {
 		#clock-cells = <0>;
-		clock-frequency = <31806>;
+		compatible = "fixed-factor-clock";
+		clocks = <&genpll_clks 0>;
+		clock-div = <2>;
+		clock-mult = <1>;
 	};
 
-	adc_clk: adc_clk {
-		compatible = "fixed-clock";
+	/* always 1/4 of the axi21 clock */
+	axi81_clk: axi81_clk {
 		#clock-cells = <0>;
-		clock-frequency = <1562500>;
+		compatible = "fixed-factor-clock";
+		clocks = <&genpll_clks 0>;
+		clock-div = <4>;
+		clock-mult = <1>;
 	};
 
-	pwm_clk: pwm_clk {
-		compatible = "fixed-clock";
+	lcpll0: lcpll0 {
 		#clock-cells = <0>;
-		clock-frequency = <1000000>;
+		compatible = "brcm,cygnus-lcpll0";
+		reg = <0x0301d02c 0x1c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
 	};
 
-	lcd_clk: mipipll_ch1 {
-		compatible = "fixed-clock";
+	/* various clocks running off the LCPLL0 */
+	lcpll0_clks: lcpll0_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-lcpll0-clk";
+		reg = <0x0301d02c 0x1c>;
+		clocks = <&lcpll0>;
+		clock-output-names = "pcie_phy", "ddr_phy", "sdio",
+			"usb_phy", "smart_card", "ch5";
+	};
+
+	mipipll: mipipll {
 		#clock-cells = <0>;
-		clock-frequency = <100000000>;
+		compatible = "brcm,cygnus-mipipll";
+		reg = <0x180a9800 0x2c>,
+			<0x0301c020 0x4>,
+			<0x180aa024 0x4>;
+		clock-frequency = <1350000000>;
+		clocks = <&osc>;
+	};
+
+	mipipll_clks: mipipll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-mipipll-clk";
+		reg = <0x180a9800 0x2c>;
+		clocks = <&mipipll>;
+		clock-output-names = "ch0_unused", "ch1_lcd", "ch2_unused",
+			"ch3_unused", "ch4_unused", "ch5_unused";
+	};
+
+	asiu_clks: asiu_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-asiu-clk";
+		reg = <0x0301d048 0xc>,
+			<0x180aa024 0x4>;
+		clocks = <&osc>;
+		clock-output-names = "keypad", "adc/touch", "pwm";
 	};
 };
diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..2b99e9c 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -134,7 +134,7 @@
 		compatible = "arm,cortex-a9-global-timer";
 		reg = <0x19020200 0x100>;
 		interrupts = <GIC_PPI 11 IRQ_TYPE_LEVEL_HIGH>;
-		clocks = <&periph_clk>;
+		clocks = <&arm_periph_clk>;
 	};
 
 };
-- 
1.7.9.5

[PATCH v2 5/5] ARM: dts: enable clock support for Broadcom Cygnus

[Ray Jui]

Replace current device tree dummy clocks with real clock support for
Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbraden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus-clock.dtsi |  110 ++++++++++++++++++++++++-------
 arch/arm/boot/dts/bcm-cygnus.dtsi       |    2 +-
 2 files changed, 86 insertions(+), 26 deletions(-)

diff --git a/arch/arm/boot/dts/bcm-cygnus-clock.dtsi b/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
index 60d8389..f2da5e2 100644
--- a/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
@@ -36,56 +36,116 @@ clocks {
 	ranges;
 
 	osc: oscillator {
+		#clock-cells = <0>;
 		compatible = "fixed-clock";
-		#clock-cells = <1>;
 		clock-frequency = <25000000>;
 	};
 
-	apb_clk: apb_clk {
-		compatible = "fixed-clock";
+	/* Cygnus ARM PLL */
+	armpll: armpll {
 		#clock-cells = <0>;
-		clock-frequency = <1000000000>;
+		compatible = "brcm,cygnus-armpll";
+		clocks = <&osc>;
+		reg = <0x19000000 0x1000>;
 	};
 
-	periph_clk: periph_clk {
-		compatible = "fixed-clock";
+	/* peripheral clock for system timer */
+	arm_periph_clk: arm_periph_clk {
 		#clock-cells = <0>;
-		clock-frequency = <500000000>;
+		compatible = "fixed-factor-clock";
+		clocks = <&armpll>;
+		clock-div = <2>;
+		clock-mult = <1>;
 	};
 
-	sdio_clk: lcpll_ch2 {
-		compatible = "fixed-clock";
+	/* APB bus clock */
+	apb_clk: apb_clk {
 		#clock-cells = <0>;
-		clock-frequency = <200000000>;
+		compatible = "fixed-factor-clock";
+		clocks = <&armpll>;
+		clock-div = <4>;
+		clock-mult = <1>;
 	};
 
-	axi81_clk: axi81_clk {
-		compatible = "fixed-clock";
+	genpll: genpll {
 		#clock-cells = <0>;
-		clock-frequency = <100000000>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
 	};
 
-	keypad_clk: keypad_clk {
-		compatible = "fixed-clock";
+	/* various clocks running off the GENPLL */
+	genpll_clks: genpll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-genpll-clk";
+		reg = <0x0301d000 0x2c>;
+		clocks = <&genpll>;
+		clock-output-names = "axi21", "250mhz", "ihost_sys",
+			"enet_sw", "audio_125", "can";
+	};
+
+	/* always 1/2 of the axi21 clock */
+	axi41_clk: axi41_clk {
 		#clock-cells = <0>;
-		clock-frequency = <31806>;
+		compatible = "fixed-factor-clock";
+		clocks = <&genpll_clks 0>;
+		clock-div = <2>;
+		clock-mult = <1>;
 	};
 
-	adc_clk: adc_clk {
-		compatible = "fixed-clock";
+	/* always 1/4 of the axi21 clock */
+	axi81_clk: axi81_clk {
 		#clock-cells = <0>;
-		clock-frequency = <1562500>;
+		compatible = "fixed-factor-clock";
+		clocks = <&genpll_clks 0>;
+		clock-div = <4>;
+		clock-mult = <1>;
 	};
 
-	pwm_clk: pwm_clk {
-		compatible = "fixed-clock";
+	lcpll0: lcpll0 {
 		#clock-cells = <0>;
-		clock-frequency = <1000000>;
+		compatible = "brcm,cygnus-lcpll0";
+		reg = <0x0301d02c 0x1c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
 	};
 
-	lcd_clk: mipipll_ch1 {
-		compatible = "fixed-clock";
+	/* various clocks running off the LCPLL0 */
+	lcpll0_clks: lcpll0_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-lcpll0-clk";
+		reg = <0x0301d02c 0x1c>;
+		clocks = <&lcpll0>;
+		clock-output-names = "pcie_phy", "ddr_phy", "sdio",
+			"usb_phy", "smart_card", "ch5";
+	};
+
+	mipipll: mipipll {
 		#clock-cells = <0>;
-		clock-frequency = <100000000>;
+		compatible = "brcm,cygnus-mipipll";
+		reg = <0x180a9800 0x2c>,
+			<0x0301c020 0x4>,
+			<0x180aa024 0x4>;
+		clock-frequency = <1350000000>;
+		clocks = <&osc>;
+	};
+
+	mipipll_clks: mipipll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-mipipll-clk";
+		reg = <0x180a9800 0x2c>;
+		clocks = <&mipipll>;
+		clock-output-names = "ch0_unused", "ch1_lcd", "ch2_unused",
+			"ch3_unused", "ch4_unused", "ch5_unused";
+	};
+
+	asiu_clks: asiu_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-asiu-clk";
+		reg = <0x0301d048 0xc>,
+			<0x180aa024 0x4>;
+		clocks = <&osc>;
+		clock-output-names = "keypad", "adc/touch", "pwm";
 	};
 };
diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..2b99e9c 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -134,7 +134,7 @@
 		compatible = "arm,cortex-a9-global-timer";
 		reg = <0x19020200 0x100>;
 		interrupts = <GIC_PPI 11 IRQ_TYPE_LEVEL_HIGH>;
-		clocks = <&periph_clk>;
+		clocks = <&arm_periph_clk>;
 	};
 
 };
-- 
1.7.9.5

Re: [PATCH v2 4/5] clk: cygnus: add clock support for Broadcom Cygnus

[Arnd Bergmann]

On Monday 05 January 2015 15:21:15 Ray Jui wrote:
> +static const struct iproc_clk_ctrl mipipll_clk[BCM_CYGNUS_NUM_MIPIPLL_CLKS] = {
> +	[BCM_CYGNUS_MIPIPLL_CH0_UNUSED] = {
> +		.channel = BCM_CYGNUS_MIPIPLL_CH0_UNUSED,
> +		.enable = enable_val(0x4, 12, 6, 18),
> +		.mdiv = reg_val(0x20, 0, 8),
> +	},
> +	[BCM_CYGNUS_MIPIPLL_CH1_LCD] = {
> +		.channel = BCM_CYGNUS_MIPIPLL_CH1_LCD,
> +		.enable = enable_val(0x4, 13, 7, 19),
> +		.mdiv = reg_val(0x20, 10, 8),
> +	},
> +	[BCM_CYGNUS_MIPIPLL_CH2_UNUSED] = {
> +		.channel = BCM_CYGNUS_MIPIPLL_CH2_UNUSED,
> +		.enable = enable_val(0x4, 14, 8, 20),
> +		.mdiv = reg_val(0x20, 20, 8),
> +	},
> +	[BCM_CYGNUS_MIPIPLL_CH3_UNUSED] = {
> +		.channel = BCM_CYGNUS_MIPIPLL_CH3_UNUSED,
> +		.enable = enable_val(0x4, 15, 9, 21),
> +		.mdiv = reg_val(0x24, 0, 8),
> +	},
> +	[BCM_CYGNUS_MIPIPLL_CH4_UNUSED] = {
> +		.channel = BCM_CYGNUS_MIPIPLL_CH4_UNUSED,
> +		.enable = enable_val(0x4, 16, 10, 22),
> +		.mdiv = reg_val(0x24, 10, 8),
> +	},
> +	[BCM_CYGNUS_MIPIPLL_CH5_UNUSED] = {
> +		.channel = BCM_CYGNUS_MIPIPLL_CH5_UNUSED,
> +		.enable = enable_val(0x4, 17, 11, 23),
> +		.mdiv = reg_val(0x24, 20, 8),
> +	},
> +};

The tables look fairly regular. Is it possible that it's common
to all iproc variants with a standard way to derive all other
values from the channel index?

> +static const struct iproc_asiu_gate asiu_gate[BCM_CYGNUS_NUM_ASIU_CLKS] = {
> +	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
> +		asiu_gate_val(0x0, 7),
> +	[BCM_CYGNUS_ASIU_ADC_CLK] =
> +		asiu_gate_val(0x0, 9),
> +	[BCM_CYGNUS_ASIU_PWM_CLK] =
> +		asiu_gate_val(IPROC_CLK_INVALID_OFFSET, 0),
> +};

Here I think a better binding would be to pass the gate value in the
clock specifier, rather than an artificial index. That would let
you get rid of the BCM_CYGNUS_ASIU_KEYPAD_CLK/BCM_CYGNUS_ASIU_ADC_CLK
macros.

> +static void __init cygnus_armpll_init(struct device_node *node)
> +{
> +	iproc_armpll_setup(node);
> +}
> +CLK_OF_DECLARE(cygnus_armpll, "brcm,cygnus-armpll", cygnus_armpll_init);

How about moving all of these directly next to the tables, to keep
each clock controller?

> +static void __init cygnus_genpll_clk_init(struct device_node *node)
> +{
> +	iproc_clk_setup(node, genpll_clk, BCM_CYGNUS_NUM_GENPLL_CLKS);
> +}

If you use ARRAY_SIZE here, you can remove the BCM_CYGNUS_NUM_GENPLL_CLKS
macro that is not useful to the DT binding.

	Arnd

[PATCH v2 4/5] clk: cygnus: add clock support for Broadcom Cygnus

[Arnd Bergmann]

On Monday 05 January 2015 15:21:15 Ray Jui wrote:
> +static const struct iproc_clk_ctrl mipipll_clk[BCM_CYGNUS_NUM_MIPIPLL_CLKS] = {
> +	[BCM_CYGNUS_MIPIPLL_CH0_UNUSED] = {
> +		.channel = BCM_CYGNUS_MIPIPLL_CH0_UNUSED,
> +		.enable = enable_val(0x4, 12, 6, 18),
> +		.mdiv = reg_val(0x20, 0, 8),
> +	},
> +	[BCM_CYGNUS_MIPIPLL_CH1_LCD] = {
> +		.channel = BCM_CYGNUS_MIPIPLL_CH1_LCD,
> +		.enable = enable_val(0x4, 13, 7, 19),
> +		.mdiv = reg_val(0x20, 10, 8),
> +	},
> +	[BCM_CYGNUS_MIPIPLL_CH2_UNUSED] = {
> +		.channel = BCM_CYGNUS_MIPIPLL_CH2_UNUSED,
> +		.enable = enable_val(0x4, 14, 8, 20),
> +		.mdiv = reg_val(0x20, 20, 8),
> +	},
> +	[BCM_CYGNUS_MIPIPLL_CH3_UNUSED] = {
> +		.channel = BCM_CYGNUS_MIPIPLL_CH3_UNUSED,
> +		.enable = enable_val(0x4, 15, 9, 21),
> +		.mdiv = reg_val(0x24, 0, 8),
> +	},
> +	[BCM_CYGNUS_MIPIPLL_CH4_UNUSED] = {
> +		.channel = BCM_CYGNUS_MIPIPLL_CH4_UNUSED,
> +		.enable = enable_val(0x4, 16, 10, 22),
> +		.mdiv = reg_val(0x24, 10, 8),
> +	},
> +	[BCM_CYGNUS_MIPIPLL_CH5_UNUSED] = {
> +		.channel = BCM_CYGNUS_MIPIPLL_CH5_UNUSED,
> +		.enable = enable_val(0x4, 17, 11, 23),
> +		.mdiv = reg_val(0x24, 20, 8),
> +	},
> +};

The tables look fairly regular. Is it possible that it's common
to all iproc variants with a standard way to derive all other
values from the channel index?

> +static const struct iproc_asiu_gate asiu_gate[BCM_CYGNUS_NUM_ASIU_CLKS] = {
> +	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
> +		asiu_gate_val(0x0, 7),
> +	[BCM_CYGNUS_ASIU_ADC_CLK] =
> +		asiu_gate_val(0x0, 9),
> +	[BCM_CYGNUS_ASIU_PWM_CLK] =
> +		asiu_gate_val(IPROC_CLK_INVALID_OFFSET, 0),
> +};

Here I think a better binding would be to pass the gate value in the
clock specifier, rather than an artificial index. That would let
you get rid of the BCM_CYGNUS_ASIU_KEYPAD_CLK/BCM_CYGNUS_ASIU_ADC_CLK
macros.

> +static void __init cygnus_armpll_init(struct device_node *node)
> +{
> +	iproc_armpll_setup(node);
> +}
> +CLK_OF_DECLARE(cygnus_armpll, "brcm,cygnus-armpll", cygnus_armpll_init);

How about moving all of these directly next to the tables, to keep
each clock controller?

> +static void __init cygnus_genpll_clk_init(struct device_node *node)
> +{
> +	iproc_clk_setup(node, genpll_clk, BCM_CYGNUS_NUM_GENPLL_CLKS);
> +}

If you use ARRAY_SIZE here, you can remove the BCM_CYGNUS_NUM_GENPLL_CLKS
macro that is not useful to the DT binding.

	Arnd

Re: [PATCH v2 4/5] clk: cygnus: add clock support for Broadcom Cygnus

[Ray Jui]

On 1/6/2015 12:21 PM, Arnd Bergmann wrote:
> On Monday 05 January 2015 15:21:15 Ray Jui wrote:
>> +static const struct iproc_clk_ctrl mipipll_clk[BCM_CYGNUS_NUM_MIPIPLL_CLKS] = {
>> +	[BCM_CYGNUS_MIPIPLL_CH0_UNUSED] = {
>> +		.channel = BCM_CYGNUS_MIPIPLL_CH0_UNUSED,
>> +		.enable = enable_val(0x4, 12, 6, 18),
>> +		.mdiv = reg_val(0x20, 0, 8),
>> +	},
>> +	[BCM_CYGNUS_MIPIPLL_CH1_LCD] = {
>> +		.channel = BCM_CYGNUS_MIPIPLL_CH1_LCD,
>> +		.enable = enable_val(0x4, 13, 7, 19),
>> +		.mdiv = reg_val(0x20, 10, 8),
>> +	},
>> +	[BCM_CYGNUS_MIPIPLL_CH2_UNUSED] = {
>> +		.channel = BCM_CYGNUS_MIPIPLL_CH2_UNUSED,
>> +		.enable = enable_val(0x4, 14, 8, 20),
>> +		.mdiv = reg_val(0x20, 20, 8),
>> +	},
>> +	[BCM_CYGNUS_MIPIPLL_CH3_UNUSED] = {
>> +		.channel = BCM_CYGNUS_MIPIPLL_CH3_UNUSED,
>> +		.enable = enable_val(0x4, 15, 9, 21),
>> +		.mdiv = reg_val(0x24, 0, 8),
>> +	},
>> +	[BCM_CYGNUS_MIPIPLL_CH4_UNUSED] = {
>> +		.channel = BCM_CYGNUS_MIPIPLL_CH4_UNUSED,
>> +		.enable = enable_val(0x4, 16, 10, 22),
>> +		.mdiv = reg_val(0x24, 10, 8),
>> +	},
>> +	[BCM_CYGNUS_MIPIPLL_CH5_UNUSED] = {
>> +		.channel = BCM_CYGNUS_MIPIPLL_CH5_UNUSED,
>> +		.enable = enable_val(0x4, 17, 11, 23),
>> +		.mdiv = reg_val(0x24, 20, 8),
>> +	},
>> +};
> 
> The tables look fairly regular. Is it possible that it's common
> to all iproc variants with a standard way to derive all other
> values from the channel index?
> 
Ah no. Not only it's different between different iproc variants, it's
also different between plls on the same soc.

>> +static const struct iproc_asiu_gate asiu_gate[BCM_CYGNUS_NUM_ASIU_CLKS] = {
>> +	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
>> +		asiu_gate_val(0x0, 7),
>> +	[BCM_CYGNUS_ASIU_ADC_CLK] =
>> +		asiu_gate_val(0x0, 9),
>> +	[BCM_CYGNUS_ASIU_PWM_CLK] =
>> +		asiu_gate_val(IPROC_CLK_INVALID_OFFSET, 0),
>> +};
> 
> Here I think a better binding would be to pass the gate value in the
> clock specifier, rather than an artificial index. That would let
> you get rid of the BCM_CYGNUS_ASIU_KEYPAD_CLK/BCM_CYGNUS_ASIU_ADC_CLK
> macros.
> 
You meant to pass in both the gate register offset and its bit shift
through the clock specifier? But isn't the current ASIU clock code much
more consistent with the rest of the iProc clock code?

>> +static void __init cygnus_armpll_init(struct device_node *node)
>> +{
>> +	iproc_armpll_setup(node);
>> +}
>> +CLK_OF_DECLARE(cygnus_armpll, "brcm,cygnus-armpll", cygnus_armpll_init);
> 
> How about moving all of these directly next to the tables, to keep
> each clock controller?
> 
Good suggestion. That would make it more clear and easier to read. Will do.

>> +static void __init cygnus_genpll_clk_init(struct device_node *node)
>> +{
>> +	iproc_clk_setup(node, genpll_clk, BCM_CYGNUS_NUM_GENPLL_CLKS);
>> +}
> 
> If you use ARRAY_SIZE here, you can remove the BCM_CYGNUS_NUM_GENPLL_CLKS
> macro that is not useful to the DT binding.
> 
Agreed. Will do this for all iproc clock setup calls. Thanks.

> 	Arnd
> 

Re: [PATCH v2 4/5] clk: cygnus: add clock support for Broadcom Cygnus

[Ray Jui]

On 1/6/2015 12:21 PM, Arnd Bergmann wrote:
> On Monday 05 January 2015 15:21:15 Ray Jui wrote:
>> +static const struct iproc_clk_ctrl mipipll_clk[BCM_CYGNUS_NUM_MIPIPLL_CLKS] = {
>> +	[BCM_CYGNUS_MIPIPLL_CH0_UNUSED] = {
>> +		.channel = BCM_CYGNUS_MIPIPLL_CH0_UNUSED,
>> +		.enable = enable_val(0x4, 12, 6, 18),
>> +		.mdiv = reg_val(0x20, 0, 8),
>> +	},
>> +	[BCM_CYGNUS_MIPIPLL_CH1_LCD] = {
>> +		.channel = BCM_CYGNUS_MIPIPLL_CH1_LCD,
>> +		.enable = enable_val(0x4, 13, 7, 19),
>> +		.mdiv = reg_val(0x20, 10, 8),
>> +	},
>> +	[BCM_CYGNUS_MIPIPLL_CH2_UNUSED] = {
>> +		.channel = BCM_CYGNUS_MIPIPLL_CH2_UNUSED,
>> +		.enable = enable_val(0x4, 14, 8, 20),
>> +		.mdiv = reg_val(0x20, 20, 8),
>> +	},
>> +	[BCM_CYGNUS_MIPIPLL_CH3_UNUSED] = {
>> +		.channel = BCM_CYGNUS_MIPIPLL_CH3_UNUSED,
>> +		.enable = enable_val(0x4, 15, 9, 21),
>> +		.mdiv = reg_val(0x24, 0, 8),
>> +	},
>> +	[BCM_CYGNUS_MIPIPLL_CH4_UNUSED] = {
>> +		.channel = BCM_CYGNUS_MIPIPLL_CH4_UNUSED,
>> +		.enable = enable_val(0x4, 16, 10, 22),
>> +		.mdiv = reg_val(0x24, 10, 8),
>> +	},
>> +	[BCM_CYGNUS_MIPIPLL_CH5_UNUSED] = {
>> +		.channel = BCM_CYGNUS_MIPIPLL_CH5_UNUSED,
>> +		.enable = enable_val(0x4, 17, 11, 23),
>> +		.mdiv = reg_val(0x24, 20, 8),
>> +	},
>> +};
> 
> The tables look fairly regular. Is it possible that it's common
> to all iproc variants with a standard way to derive all other
> values from the channel index?
> 
Ah no. Not only it's different between different iproc variants, it's
also different between plls on the same soc.

>> +static const struct iproc_asiu_gate asiu_gate[BCM_CYGNUS_NUM_ASIU_CLKS] = {
>> +	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
>> +		asiu_gate_val(0x0, 7),
>> +	[BCM_CYGNUS_ASIU_ADC_CLK] =
>> +		asiu_gate_val(0x0, 9),
>> +	[BCM_CYGNUS_ASIU_PWM_CLK] =
>> +		asiu_gate_val(IPROC_CLK_INVALID_OFFSET, 0),
>> +};
> 
> Here I think a better binding would be to pass the gate value in the
> clock specifier, rather than an artificial index. That would let
> you get rid of the BCM_CYGNUS_ASIU_KEYPAD_CLK/BCM_CYGNUS_ASIU_ADC_CLK
> macros.
> 
You meant to pass in both the gate register offset and its bit shift
through the clock specifier? But isn't the current ASIU clock code much
more consistent with the rest of the iProc clock code?

>> +static void __init cygnus_armpll_init(struct device_node *node)
>> +{
>> +	iproc_armpll_setup(node);
>> +}
>> +CLK_OF_DECLARE(cygnus_armpll, "brcm,cygnus-armpll", cygnus_armpll_init);
> 
> How about moving all of these directly next to the tables, to keep
> each clock controller?
> 
Good suggestion. That would make it more clear and easier to read. Will do.

>> +static void __init cygnus_genpll_clk_init(struct device_node *node)
>> +{
>> +	iproc_clk_setup(node, genpll_clk, BCM_CYGNUS_NUM_GENPLL_CLKS);
>> +}
> 
> If you use ARRAY_SIZE here, you can remove the BCM_CYGNUS_NUM_GENPLL_CLKS
> macro that is not useful to the DT binding.
> 
Agreed. Will do this for all iproc clock setup calls. Thanks.

> 	Arnd
> 

[PATCH v2 4/5] clk: cygnus: add clock support for Broadcom Cygnus

[Ray Jui]

On 1/6/2015 12:21 PM, Arnd Bergmann wrote:
> On Monday 05 January 2015 15:21:15 Ray Jui wrote:
>> +static const struct iproc_clk_ctrl mipipll_clk[BCM_CYGNUS_NUM_MIPIPLL_CLKS] = {
>> +	[BCM_CYGNUS_MIPIPLL_CH0_UNUSED] = {
>> +		.channel = BCM_CYGNUS_MIPIPLL_CH0_UNUSED,
>> +		.enable = enable_val(0x4, 12, 6, 18),
>> +		.mdiv = reg_val(0x20, 0, 8),
>> +	},
>> +	[BCM_CYGNUS_MIPIPLL_CH1_LCD] = {
>> +		.channel = BCM_CYGNUS_MIPIPLL_CH1_LCD,
>> +		.enable = enable_val(0x4, 13, 7, 19),
>> +		.mdiv = reg_val(0x20, 10, 8),
>> +	},
>> +	[BCM_CYGNUS_MIPIPLL_CH2_UNUSED] = {
>> +		.channel = BCM_CYGNUS_MIPIPLL_CH2_UNUSED,
>> +		.enable = enable_val(0x4, 14, 8, 20),
>> +		.mdiv = reg_val(0x20, 20, 8),
>> +	},
>> +	[BCM_CYGNUS_MIPIPLL_CH3_UNUSED] = {
>> +		.channel = BCM_CYGNUS_MIPIPLL_CH3_UNUSED,
>> +		.enable = enable_val(0x4, 15, 9, 21),
>> +		.mdiv = reg_val(0x24, 0, 8),
>> +	},
>> +	[BCM_CYGNUS_MIPIPLL_CH4_UNUSED] = {
>> +		.channel = BCM_CYGNUS_MIPIPLL_CH4_UNUSED,
>> +		.enable = enable_val(0x4, 16, 10, 22),
>> +		.mdiv = reg_val(0x24, 10, 8),
>> +	},
>> +	[BCM_CYGNUS_MIPIPLL_CH5_UNUSED] = {
>> +		.channel = BCM_CYGNUS_MIPIPLL_CH5_UNUSED,
>> +		.enable = enable_val(0x4, 17, 11, 23),
>> +		.mdiv = reg_val(0x24, 20, 8),
>> +	},
>> +};
> 
> The tables look fairly regular. Is it possible that it's common
> to all iproc variants with a standard way to derive all other
> values from the channel index?
> 
Ah no. Not only it's different between different iproc variants, it's
also different between plls on the same soc.

>> +static const struct iproc_asiu_gate asiu_gate[BCM_CYGNUS_NUM_ASIU_CLKS] = {
>> +	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
>> +		asiu_gate_val(0x0, 7),
>> +	[BCM_CYGNUS_ASIU_ADC_CLK] =
>> +		asiu_gate_val(0x0, 9),
>> +	[BCM_CYGNUS_ASIU_PWM_CLK] =
>> +		asiu_gate_val(IPROC_CLK_INVALID_OFFSET, 0),
>> +};
> 
> Here I think a better binding would be to pass the gate value in the
> clock specifier, rather than an artificial index. That would let
> you get rid of the BCM_CYGNUS_ASIU_KEYPAD_CLK/BCM_CYGNUS_ASIU_ADC_CLK
> macros.
> 
You meant to pass in both the gate register offset and its bit shift
through the clock specifier? But isn't the current ASIU clock code much
more consistent with the rest of the iProc clock code?

>> +static void __init cygnus_armpll_init(struct device_node *node)
>> +{
>> +	iproc_armpll_setup(node);
>> +}
>> +CLK_OF_DECLARE(cygnus_armpll, "brcm,cygnus-armpll", cygnus_armpll_init);
> 
> How about moving all of these directly next to the tables, to keep
> each clock controller?
> 
Good suggestion. That would make it more clear and easier to read. Will do.

>> +static void __init cygnus_genpll_clk_init(struct device_node *node)
>> +{
>> +	iproc_clk_setup(node, genpll_clk, BCM_CYGNUS_NUM_GENPLL_CLKS);
>> +}
> 
> If you use ARRAY_SIZE here, you can remove the BCM_CYGNUS_NUM_GENPLL_CLKS
> macro that is not useful to the DT binding.
> 
Agreed. Will do this for all iproc clock setup calls. Thanks.

> 	Arnd
> 

Re: [PATCH v2 4/5] clk: cygnus: add clock support for Broadcom Cygnus

[Arnd Bergmann]

On Tuesday 06 January 2015 18:29:07 Ray Jui wrote:
> On 1/6/2015 12:21 PM, Arnd Bergmann wrote:
> > On Monday 05 January 2015 15:21:15 Ray Jui wrote:
> > 
> > The tables look fairly regular. Is it possible that it's common
> > to all iproc variants with a standard way to derive all other
> > values from the channel index?
> > 
> Ah no. Not only it's different between different iproc variants, it's
> also different between plls on the same soc.

Ok, I see.
 
> >> +static const struct iproc_asiu_gate asiu_gate[BCM_CYGNUS_NUM_ASIU_CLKS] = {
> >> +	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
> >> +		asiu_gate_val(0x0, 7),
> >> +	[BCM_CYGNUS_ASIU_ADC_CLK] =
> >> +		asiu_gate_val(0x0, 9),
> >> +	[BCM_CYGNUS_ASIU_PWM_CLK] =
> >> +		asiu_gate_val(IPROC_CLK_INVALID_OFFSET, 0),
> >> +};
> > 
> > Here I think a better binding would be to pass the gate value in the
> > clock specifier, rather than an artificial index. That would let
> > you get rid of the BCM_CYGNUS_ASIU_KEYPAD_CLK/BCM_CYGNUS_ASIU_ADC_CLK
> > macros.
> > 
> You meant to pass in both the gate register offset and its bit shift
> through the clock specifier? But isn't the current ASIU clock code much
> more consistent with the rest of the iProc clock code?

For simple devices that don't need an index macro, I would always
prefer not defining them, because they are a pain to maintain.
For a simple gate clock controller, we could compute both the offset
and bit number from a single integer.

However, I now saw upon taking a closer look that the asiu has both
a gate and a divider, and the latter one is not as simple, so
my comment doesn't apply here.

	Arnd

Re: [PATCH v2 4/5] clk: cygnus: add clock support for Broadcom Cygnus

[Arnd Bergmann]

On Tuesday 06 January 2015 18:29:07 Ray Jui wrote:
> On 1/6/2015 12:21 PM, Arnd Bergmann wrote:
> > On Monday 05 January 2015 15:21:15 Ray Jui wrote:
> > 
> > The tables look fairly regular. Is it possible that it's common
> > to all iproc variants with a standard way to derive all other
> > values from the channel index?
> > 
> Ah no. Not only it's different between different iproc variants, it's
> also different between plls on the same soc.

Ok, I see.
 
> >> +static const struct iproc_asiu_gate asiu_gate[BCM_CYGNUS_NUM_ASIU_CLKS] = {
> >> +	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
> >> +		asiu_gate_val(0x0, 7),
> >> +	[BCM_CYGNUS_ASIU_ADC_CLK] =
> >> +		asiu_gate_val(0x0, 9),
> >> +	[BCM_CYGNUS_ASIU_PWM_CLK] =
> >> +		asiu_gate_val(IPROC_CLK_INVALID_OFFSET, 0),
> >> +};
> > 
> > Here I think a better binding would be to pass the gate value in the
> > clock specifier, rather than an artificial index. That would let
> > you get rid of the BCM_CYGNUS_ASIU_KEYPAD_CLK/BCM_CYGNUS_ASIU_ADC_CLK
> > macros.
> > 
> You meant to pass in both the gate register offset and its bit shift
> through the clock specifier? But isn't the current ASIU clock code much
> more consistent with the rest of the iProc clock code?

For simple devices that don't need an index macro, I would always
prefer not defining them, because they are a pain to maintain.
For a simple gate clock controller, we could compute both the offset
and bit number from a single integer.

However, I now saw upon taking a closer look that the asiu has both
a gate and a divider, and the latter one is not as simple, so
my comment doesn't apply here.

	Arnd
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[PATCH v2 4/5] clk: cygnus: add clock support for Broadcom Cygnus

[Arnd Bergmann]

On Tuesday 06 January 2015 18:29:07 Ray Jui wrote:
> On 1/6/2015 12:21 PM, Arnd Bergmann wrote:
> > On Monday 05 January 2015 15:21:15 Ray Jui wrote:
> > 
> > The tables look fairly regular. Is it possible that it's common
> > to all iproc variants with a standard way to derive all other
> > values from the channel index?
> > 
> Ah no. Not only it's different between different iproc variants, it's
> also different between plls on the same soc.

Ok, I see.
 
> >> +static const struct iproc_asiu_gate asiu_gate[BCM_CYGNUS_NUM_ASIU_CLKS] = {
> >> +	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
> >> +		asiu_gate_val(0x0, 7),
> >> +	[BCM_CYGNUS_ASIU_ADC_CLK] =
> >> +		asiu_gate_val(0x0, 9),
> >> +	[BCM_CYGNUS_ASIU_PWM_CLK] =
> >> +		asiu_gate_val(IPROC_CLK_INVALID_OFFSET, 0),
> >> +};
> > 
> > Here I think a better binding would be to pass the gate value in the
> > clock specifier, rather than an artificial index. That would let
> > you get rid of the BCM_CYGNUS_ASIU_KEYPAD_CLK/BCM_CYGNUS_ASIU_ADC_CLK
> > macros.
> > 
> You meant to pass in both the gate register offset and its bit shift
> through the clock specifier? But isn't the current ASIU clock code much
> more consistent with the rest of the iProc clock code?

For simple devices that don't need an index macro, I would always
prefer not defining them, because they are a pain to maintain.
For a simple gate clock controller, we could compute both the offset
and bit number from a single integer.

However, I now saw upon taking a closer look that the asiu has both
a gate and a divider, and the latter one is not as simple, so
my comment doesn't apply here.

	Arnd

Re: [PATCH v2 4/5] clk: cygnus: add clock support for Broadcom Cygnus

[Ray Jui]

On 1/7/2015 1:11 AM, Arnd Bergmann wrote:
> On Tuesday 06 January 2015 18:29:07 Ray Jui wrote:
>> On 1/6/2015 12:21 PM, Arnd Bergmann wrote:
>>> On Monday 05 January 2015 15:21:15 Ray Jui wrote:
>>>> +static const struct iproc_asiu_gate asiu_gate[BCM_CYGNUS_NUM_ASIU_CLKS] = {
>>>> +	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
>>>> +		asiu_gate_val(0x0, 7),
>>>> +	[BCM_CYGNUS_ASIU_ADC_CLK] =
>>>> +		asiu_gate_val(0x0, 9),
>>>> +	[BCM_CYGNUS_ASIU_PWM_CLK] =
>>>> +		asiu_gate_val(IPROC_CLK_INVALID_OFFSET, 0),
>>>> +};
>>>
>>> Here I think a better binding would be to pass the gate value in the
>>> clock specifier, rather than an artificial index. That would let
>>> you get rid of the BCM_CYGNUS_ASIU_KEYPAD_CLK/BCM_CYGNUS_ASIU_ADC_CLK
>>> macros.
>>>
>> You meant to pass in both the gate register offset and its bit shift
>> through the clock specifier? But isn't the current ASIU clock code much
>> more consistent with the rest of the iProc clock code?
> 
> For simple devices that don't need an index macro, I would always
> prefer not defining them, because they are a pain to maintain.
> For a simple gate clock controller, we could compute both the offset
> and bit number from a single integer.
> 
> However, I now saw upon taking a closer look that the asiu has both
> a gate and a divider, and the latter one is not as simple, so
> my comment doesn't apply here.
> 
> 	Arnd
> 
Okay. I'll leave this as it is and make other changes based on the
review. Thanks!

Re: [PATCH v2 4/5] clk: cygnus: add clock support for Broadcom Cygnus

[Ray Jui]

On 1/7/2015 1:11 AM, Arnd Bergmann wrote:
> On Tuesday 06 January 2015 18:29:07 Ray Jui wrote:
>> On 1/6/2015 12:21 PM, Arnd Bergmann wrote:
>>> On Monday 05 January 2015 15:21:15 Ray Jui wrote:
>>>> +static const struct iproc_asiu_gate asiu_gate[BCM_CYGNUS_NUM_ASIU_CLKS] = {
>>>> +	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
>>>> +		asiu_gate_val(0x0, 7),
>>>> +	[BCM_CYGNUS_ASIU_ADC_CLK] =
>>>> +		asiu_gate_val(0x0, 9),
>>>> +	[BCM_CYGNUS_ASIU_PWM_CLK] =
>>>> +		asiu_gate_val(IPROC_CLK_INVALID_OFFSET, 0),
>>>> +};
>>>
>>> Here I think a better binding would be to pass the gate value in the
>>> clock specifier, rather than an artificial index. That would let
>>> you get rid of the BCM_CYGNUS_ASIU_KEYPAD_CLK/BCM_CYGNUS_ASIU_ADC_CLK
>>> macros.
>>>
>> You meant to pass in both the gate register offset and its bit shift
>> through the clock specifier? But isn't the current ASIU clock code much
>> more consistent with the rest of the iProc clock code?
> 
> For simple devices that don't need an index macro, I would always
> prefer not defining them, because they are a pain to maintain.
> For a simple gate clock controller, we could compute both the offset
> and bit number from a single integer.
> 
> However, I now saw upon taking a closer look that the asiu has both
> a gate and a divider, and the latter one is not as simple, so
> my comment doesn't apply here.
> 
> 	Arnd
> 
Okay. I'll leave this as it is and make other changes based on the
review. Thanks!

[PATCH v2 4/5] clk: cygnus: add clock support for Broadcom Cygnus

[Ray Jui]

On 1/7/2015 1:11 AM, Arnd Bergmann wrote:
> On Tuesday 06 January 2015 18:29:07 Ray Jui wrote:
>> On 1/6/2015 12:21 PM, Arnd Bergmann wrote:
>>> On Monday 05 January 2015 15:21:15 Ray Jui wrote:
>>>> +static const struct iproc_asiu_gate asiu_gate[BCM_CYGNUS_NUM_ASIU_CLKS] = {
>>>> +	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
>>>> +		asiu_gate_val(0x0, 7),
>>>> +	[BCM_CYGNUS_ASIU_ADC_CLK] =
>>>> +		asiu_gate_val(0x0, 9),
>>>> +	[BCM_CYGNUS_ASIU_PWM_CLK] =
>>>> +		asiu_gate_val(IPROC_CLK_INVALID_OFFSET, 0),
>>>> +};
>>>
>>> Here I think a better binding would be to pass the gate value in the
>>> clock specifier, rather than an artificial index. That would let
>>> you get rid of the BCM_CYGNUS_ASIU_KEYPAD_CLK/BCM_CYGNUS_ASIU_ADC_CLK
>>> macros.
>>>
>> You meant to pass in both the gate register offset and its bit shift
>> through the clock specifier? But isn't the current ASIU clock code much
>> more consistent with the rest of the iProc clock code?
> 
> For simple devices that don't need an index macro, I would always
> prefer not defining them, because they are a pain to maintain.
> For a simple gate clock controller, we could compute both the offset
> and bit number from a single integer.
> 
> However, I now saw upon taking a closer look that the asiu has both
> a gate and a divider, and the latter one is not as simple, so
> my comment doesn't apply here.
> 
> 	Arnd
> 
Okay. I'll leave this as it is and make other changes based on the
review. Thanks!

[PATCH v3 0/5] Add common clock support for Broadcom iProc architecture

[Ray Jui]

This patchset contains the initial common clock support for Broadcom's iProc
family of SoCs. The iProc clock architecture comprises of various PLLs, e.g.,
ARMPLL, GENPLL, LCPLL0, MIPIPLL, and etc. An onboard crystal serves as the
basic reference clock for these PLLs. Each PLL may have several leaf clocks.
One special group of clocks is the ASIU clocks, which are dervied directly
from the crystal reference clock.

This patchset also contains the basic clock support for the Broadcom Cygnus
SoC, which implements the iProc clock architecture

Changes from v2:
 - Re-arrange Cygnus clock/pll init functions so each init function is right
   next to its clock table
 - Removed #defines for number of clocks in Cygnus. Have the number of clocks
   automatically determined based on array size of the clock table

Changes from v1:
 - Separate drivers/clk/Makefile change for drivers/clk/bcm out to a standalone patch

Ray Jui (5):
  clk: iproc: define Broadcom iProc clock binding
  clk: iproc: add initial common clock support
  clk: Change bcm clocks build dependency
  clk: cygnus: add clock support for Broadcom Cygnus
  ARM: dts: enable clock support for Broadcom Cygnus

 arch/arm/boot/dts/bcm-cygnus-clock.dtsi |  110 +++++--
 arch/arm/boot/dts/bcm-cygnus.dtsi       |    2 +-
 brcm,iproc-clocks.txt                   |  178 ++++++++++++
 drivers/clk/Makefile                    |    2 +-
 drivers/clk/bcm/Kconfig                 |    9 +
 drivers/clk/bcm/Makefile                |    2 +
 drivers/clk/bcm/clk-cygnus.c            |  277 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-armpll.c      |  286 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-asiu.c        |  275 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-clk.c         |  238 +++++++++++++++
 drivers/clk/bcm/clk-iproc-pll.c         |  483 +++++++++++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc.h             |  155 ++++++++++
 include/dt-bindings/clock/bcm-cygnus.h  |   65 +++++
 13 files changed, 2055 insertions(+), 27 deletions(-)
 create mode 100644 brcm,iproc-clocks.txt
 create mode 100644 drivers/clk/bcm/clk-cygnus.c
 create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
 create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
 create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
 create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
 create mode 100644 drivers/clk/bcm/clk-iproc.h
 create mode 100644 include/dt-bindings/clock/bcm-cygnus.h

-- 
1.7.9.5

[PATCH v3 0/5] Add common clock support for Broadcom iProc architecture

[Ray Jui]

This patchset contains the initial common clock support for Broadcom's iProc
family of SoCs. The iProc clock architecture comprises of various PLLs, e.g.,
ARMPLL, GENPLL, LCPLL0, MIPIPLL, and etc. An onboard crystal serves as the
basic reference clock for these PLLs. Each PLL may have several leaf clocks.
One special group of clocks is the ASIU clocks, which are dervied directly
from the crystal reference clock.

This patchset also contains the basic clock support for the Broadcom Cygnus
SoC, which implements the iProc clock architecture

Changes from v2:
 - Re-arrange Cygnus clock/pll init functions so each init function is right
   next to its clock table
 - Removed #defines for number of clocks in Cygnus. Have the number of clocks
   automatically determined based on array size of the clock table

Changes from v1:
 - Separate drivers/clk/Makefile change for drivers/clk/bcm out to a standalone patch

Ray Jui (5):
  clk: iproc: define Broadcom iProc clock binding
  clk: iproc: add initial common clock support
  clk: Change bcm clocks build dependency
  clk: cygnus: add clock support for Broadcom Cygnus
  ARM: dts: enable clock support for Broadcom Cygnus

 arch/arm/boot/dts/bcm-cygnus-clock.dtsi |  110 +++++--
 arch/arm/boot/dts/bcm-cygnus.dtsi       |    2 +-
 brcm,iproc-clocks.txt                   |  178 ++++++++++++
 drivers/clk/Makefile                    |    2 +-
 drivers/clk/bcm/Kconfig                 |    9 +
 drivers/clk/bcm/Makefile                |    2 +
 drivers/clk/bcm/clk-cygnus.c            |  277 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-armpll.c      |  286 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-asiu.c        |  275 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-clk.c         |  238 +++++++++++++++
 drivers/clk/bcm/clk-iproc-pll.c         |  483 +++++++++++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc.h             |  155 ++++++++++
 include/dt-bindings/clock/bcm-cygnus.h  |   65 +++++
 13 files changed, 2055 insertions(+), 27 deletions(-)
 create mode 100644 brcm,iproc-clocks.txt
 create mode 100644 drivers/clk/bcm/clk-cygnus.c
 create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
 create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
 create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
 create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
 create mode 100644 drivers/clk/bcm/clk-iproc.h
 create mode 100644 include/dt-bindings/clock/bcm-cygnus.h

-- 
1.7.9.5

[PATCH v3 0/5] Add common clock support for Broadcom iProc architecture

[Ray Jui]

This patchset contains the initial common clock support for Broadcom's iProc
family of SoCs. The iProc clock architecture comprises of various PLLs, e.g.,
ARMPLL, GENPLL, LCPLL0, MIPIPLL, and etc. An onboard crystal serves as the
basic reference clock for these PLLs. Each PLL may have several leaf clocks.
One special group of clocks is the ASIU clocks, which are dervied directly
from the crystal reference clock.

This patchset also contains the basic clock support for the Broadcom Cygnus
SoC, which implements the iProc clock architecture

Changes from v2:
 - Re-arrange Cygnus clock/pll init functions so each init function is right
   next to its clock table
 - Removed #defines for number of clocks in Cygnus. Have the number of clocks
   automatically determined based on array size of the clock table

Changes from v1:
 - Separate drivers/clk/Makefile change for drivers/clk/bcm out to a standalone patch

Ray Jui (5):
  clk: iproc: define Broadcom iProc clock binding
  clk: iproc: add initial common clock support
  clk: Change bcm clocks build dependency
  clk: cygnus: add clock support for Broadcom Cygnus
  ARM: dts: enable clock support for Broadcom Cygnus

 arch/arm/boot/dts/bcm-cygnus-clock.dtsi |  110 +++++--
 arch/arm/boot/dts/bcm-cygnus.dtsi       |    2 +-
 brcm,iproc-clocks.txt                   |  178 ++++++++++++
 drivers/clk/Makefile                    |    2 +-
 drivers/clk/bcm/Kconfig                 |    9 +
 drivers/clk/bcm/Makefile                |    2 +
 drivers/clk/bcm/clk-cygnus.c            |  277 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-armpll.c      |  286 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-asiu.c        |  275 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-clk.c         |  238 +++++++++++++++
 drivers/clk/bcm/clk-iproc-pll.c         |  483 +++++++++++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc.h             |  155 ++++++++++
 include/dt-bindings/clock/bcm-cygnus.h  |   65 +++++
 13 files changed, 2055 insertions(+), 27 deletions(-)
 create mode 100644 brcm,iproc-clocks.txt
 create mode 100644 drivers/clk/bcm/clk-cygnus.c
 create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
 create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
 create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
 create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
 create mode 100644 drivers/clk/bcm/clk-iproc.h
 create mode 100644 include/dt-bindings/clock/bcm-cygnus.h

-- 
1.7.9.5

[PATCH v3 1/5] clk: iproc: define Broadcom iProc clock binding

[Ray Jui]

Document the device tree binding for Broadcom iProc architecture based
clock controller

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 brcm,iproc-clocks.txt |  178 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 178 insertions(+)
 create mode 100644 brcm,iproc-clocks.txt

diff --git a/brcm,iproc-clocks.txt b/brcm,iproc-clocks.txt
new file mode 100644
index 0000000..cc64fd2
--- /dev/null
+++ b/brcm,iproc-clocks.txt
@@ -0,0 +1,178 @@
+Broadcom iProc Family Clocks
+
+This binding uses the common clock binding:
+    Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+The iProc clock controller manages clocks that are common to the iProc family.
+An SoC from the iProc family may have several PPLs, e.g., ARMPLL, GENPLL,
+LCPLL0, MIPIPLL, and etc., all derived from an onboard crystal. Each PLL
+comprises of several leaf clocks
+
+Required properties for PLLs:
+- compatible:
+    Should have a value of the form "brcm,<soc>-<pll>". For example, GENPLL on
+Cygnus has a compatible string of "brcm,cygnus-genpll"
+
+- #clock-cells:
+    Must be <0>
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL
+
+- clocks:
+    The input parent clock phandle for the PLL. For all iProc PLLs, this is an
+onboard crystal with a fixed rate
+
+Optional Properties for PLLs:
+- clock-frequency:
+    PLL frequency in Hz. If specified, PLL will be configured to run at
+<clock-frequency> instead of the default frequency after chip reset, provided
+that <clock-frequency> and its parameters are defined in the SoC specific
+frequency parameter table
+
+Example:
+
+	osc: oscillator {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <25000000>;
+	};
+
+	genpll: genpll {
+		#clock-cells = <0>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
+	};
+
+Required properties for leaf clocks of a PLL:
+
+- compatible:
+    Should have a value of the form "brcm,<soc>-<pll>-clk". For example, leaf
+clocks derived from the GENPLL on Cygnus SoC have a compatible string of
+"brcm,cygnus-genpll-clk"
+
+- #clock-cells:
+    Have a value of <1> since there are more than 1 leaf clock of a
+given PLL
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL leaf clocks
+
+- clocks:
+    The input parent PLL phandle for the leaf clock
+
+- clock-output-names:
+    An ordered list of strings defining the names of the leaf clocks
+
+Example:
+
+	genpll: genpll {
+		#clock-cells = <0>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
+	};
+
+	genpll_clks: genpll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-genpll-clk";
+		reg = <0x0301d000 0x2c>;
+		clocks = <&genpll>;
+		clock-output-names = "axi21", "250mhz", "ihost_sys",
+			"enet_sw", "audio_125", "can";
+	};
+
+Required properties for ASIU clocks:
+
+ASIU clocks are a special case. These clocks are derived directly from the
+reference clock of the onboard crystal
+
+- compatible:
+    Should have a value of the form "brcm,<soc>-asiu-clk". For example, ASIU
+clocks for Cygnus have a compatible string of "brcm,cygnus-asiu-clk"
+
+- #clock-cells:
+    Have a value of <1> since there are more than 1 ASIU clocks
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for ASIU clocks
+
+- clocks:
+    The input parent clock phandle for the ASIU clock, i.e., the onboard
+crystal
+
+- clock-output-names:
+    An ordered list of strings defining the names of the ASIU clocks
+
+Example:
+
+	osc: oscillator {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <25000000>;
+	};
+
+	asiu_clks: asiu_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-asiu-clk";
+		reg = <0x0301d048 0xc>,
+			<0x180aa024 0x4>;
+		clocks = <&osc>;
+		clock-output-names = "keypad", "adc/touch", "pwm";
+	};
+
+Cygnus
+------
+PLL and leaf clock compatible strings for Cygnus are:
+    "brcm,cygnus-armpll"
+    "brcm,cygnus-genpll"
+    "brcm,cygnus-lcpll0"
+    "brcm,cygnus-mipipll"
+    "brcm,cygnus-genpll-clk"
+    "brcm,cygnus-lcpll0-clk"
+    "brcm,cygnus-mipipll-clk"
+    "brcm,cygnus-asiu-clk"
+
+The following table defines the set of PLL/clock index and ID for Cygnus.
+These clock IDs are defined in:
+    "include/dt-bindings/clock/bcm-cygnus.h"
+
+    Clock      Source           Index   ID
+    ---        -----            -----   ---------
+    crystal    N/A              N/A     N/A
+
+    armpll     crystal          N/A     N/A
+    genpll     crystal          N/A     N/A
+    lcpll0     crystal          N/A     N/A
+    mipipll    crystal          N/A     N/A
+
+    keypad     crystal (ASIU)   0       BCM_CYGNUS_ASIU_KEYPAD_CLK
+    adc/tsc    crystal (ASIU)   1       BCM_CYGNUS_ASIU_ADC_CLK
+    pwm        crystal (ASIU)   2       BCM_CYGNUS_ASIU_PWM_CLK
+
+    axi21      genpll           0       BCM_CYGNUS_GENPLL_AXI21_CLK
+    250mhz     genpll           1       BCM_CYGNUS_GENPLL_250MHZ_CLK
+    ihost_sys  genpll           2       BCM_CYGNUS_GENPLL_IHOST_SYS_CLK
+    enet_sw    genpll           3       BCM_CYGNUS_GENPLL_ENET_SW_CLK
+    audio_125  genpll           4       BCM_CYGNUS_GENPLL_AUDIO_125_CLK
+    can        genpll           5       BCM_CYGNUS_GENPLL_CAN_CLK
+
+    pcie_phy   lcpll0           0       BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK
+    ddr_phy    lcpll0           1       BCM_CYGNUS_LCPLL0_DDR_PHY_CLK
+    sdio       lcpll0           2       BCM_CYGNUS_LCPLL0_SDIO_CLK
+    usb_phy    lcpll0           3       BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK
+    smart_card lcpll0           4       BCM_CYGNUS_LCPLL0_SMART_CARD_CLK
+    ch5        lcpll0           5       BCM_CYGNUS_LCPLL0_CH5_UNUSED
+
+    ch0_unused mipipll          0       BCM_CYGNUS_MIPIPLL_CH0_UNUSED
+    ch1_lcd    mipipll          1       BCM_CYGNUS_MIPIPLL_CH1_LCD
+    ch2_unused mipipll          2       BCM_CYGNUS_MIPIPLL_CH2_UNUSED
+    ch3_unused mipipll          3       BCM_CYGNUS_MIPIPLL_CH3_UNUSED
+    ch4_unused mipipll          4       BCM_CYGNUS_MIPIPLL_CH4_UNUSED
+    ch5_unused mipipll          5       BCM_CYGNUS_MIPIPLL_CH5_UNUSED
-- 
1.7.9.5

[PATCH v3 1/5] clk: iproc: define Broadcom iProc clock binding

[Ray Jui]

Document the device tree binding for Broadcom iProc architecture based
clock controller

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 brcm,iproc-clocks.txt |  178 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 178 insertions(+)
 create mode 100644 brcm,iproc-clocks.txt

diff --git a/brcm,iproc-clocks.txt b/brcm,iproc-clocks.txt
new file mode 100644
index 0000000..cc64fd2
--- /dev/null
+++ b/brcm,iproc-clocks.txt
@@ -0,0 +1,178 @@
+Broadcom iProc Family Clocks
+
+This binding uses the common clock binding:
+    Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+The iProc clock controller manages clocks that are common to the iProc family.
+An SoC from the iProc family may have several PPLs, e.g., ARMPLL, GENPLL,
+LCPLL0, MIPIPLL, and etc., all derived from an onboard crystal. Each PLL
+comprises of several leaf clocks
+
+Required properties for PLLs:
+- compatible:
+    Should have a value of the form "brcm,<soc>-<pll>". For example, GENPLL on
+Cygnus has a compatible string of "brcm,cygnus-genpll"
+
+- #clock-cells:
+    Must be <0>
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL
+
+- clocks:
+    The input parent clock phandle for the PLL. For all iProc PLLs, this is an
+onboard crystal with a fixed rate
+
+Optional Properties for PLLs:
+- clock-frequency:
+    PLL frequency in Hz. If specified, PLL will be configured to run at
+<clock-frequency> instead of the default frequency after chip reset, provided
+that <clock-frequency> and its parameters are defined in the SoC specific
+frequency parameter table
+
+Example:
+
+	osc: oscillator {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <25000000>;
+	};
+
+	genpll: genpll {
+		#clock-cells = <0>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
+	};
+
+Required properties for leaf clocks of a PLL:
+
+- compatible:
+    Should have a value of the form "brcm,<soc>-<pll>-clk". For example, leaf
+clocks derived from the GENPLL on Cygnus SoC have a compatible string of
+"brcm,cygnus-genpll-clk"
+
+- #clock-cells:
+    Have a value of <1> since there are more than 1 leaf clock of a
+given PLL
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL leaf clocks
+
+- clocks:
+    The input parent PLL phandle for the leaf clock
+
+- clock-output-names:
+    An ordered list of strings defining the names of the leaf clocks
+
+Example:
+
+	genpll: genpll {
+		#clock-cells = <0>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
+	};
+
+	genpll_clks: genpll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-genpll-clk";
+		reg = <0x0301d000 0x2c>;
+		clocks = <&genpll>;
+		clock-output-names = "axi21", "250mhz", "ihost_sys",
+			"enet_sw", "audio_125", "can";
+	};
+
+Required properties for ASIU clocks:
+
+ASIU clocks are a special case. These clocks are derived directly from the
+reference clock of the onboard crystal
+
+- compatible:
+    Should have a value of the form "brcm,<soc>-asiu-clk". For example, ASIU
+clocks for Cygnus have a compatible string of "brcm,cygnus-asiu-clk"
+
+- #clock-cells:
+    Have a value of <1> since there are more than 1 ASIU clocks
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for ASIU clocks
+
+- clocks:
+    The input parent clock phandle for the ASIU clock, i.e., the onboard
+crystal
+
+- clock-output-names:
+    An ordered list of strings defining the names of the ASIU clocks
+
+Example:
+
+	osc: oscillator {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <25000000>;
+	};
+
+	asiu_clks: asiu_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-asiu-clk";
+		reg = <0x0301d048 0xc>,
+			<0x180aa024 0x4>;
+		clocks = <&osc>;
+		clock-output-names = "keypad", "adc/touch", "pwm";
+	};
+
+Cygnus
+------
+PLL and leaf clock compatible strings for Cygnus are:
+    "brcm,cygnus-armpll"
+    "brcm,cygnus-genpll"
+    "brcm,cygnus-lcpll0"
+    "brcm,cygnus-mipipll"
+    "brcm,cygnus-genpll-clk"
+    "brcm,cygnus-lcpll0-clk"
+    "brcm,cygnus-mipipll-clk"
+    "brcm,cygnus-asiu-clk"
+
+The following table defines the set of PLL/clock index and ID for Cygnus.
+These clock IDs are defined in:
+    "include/dt-bindings/clock/bcm-cygnus.h"
+
+    Clock      Source           Index   ID
+    ---        -----            -----   ---------
+    crystal    N/A              N/A     N/A
+
+    armpll     crystal          N/A     N/A
+    genpll     crystal          N/A     N/A
+    lcpll0     crystal          N/A     N/A
+    mipipll    crystal          N/A     N/A
+
+    keypad     crystal (ASIU)   0       BCM_CYGNUS_ASIU_KEYPAD_CLK
+    adc/tsc    crystal (ASIU)   1       BCM_CYGNUS_ASIU_ADC_CLK
+    pwm        crystal (ASIU)   2       BCM_CYGNUS_ASIU_PWM_CLK
+
+    axi21      genpll           0       BCM_CYGNUS_GENPLL_AXI21_CLK
+    250mhz     genpll           1       BCM_CYGNUS_GENPLL_250MHZ_CLK
+    ihost_sys  genpll           2       BCM_CYGNUS_GENPLL_IHOST_SYS_CLK
+    enet_sw    genpll           3       BCM_CYGNUS_GENPLL_ENET_SW_CLK
+    audio_125  genpll           4       BCM_CYGNUS_GENPLL_AUDIO_125_CLK
+    can        genpll           5       BCM_CYGNUS_GENPLL_CAN_CLK
+
+    pcie_phy   lcpll0           0       BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK
+    ddr_phy    lcpll0           1       BCM_CYGNUS_LCPLL0_DDR_PHY_CLK
+    sdio       lcpll0           2       BCM_CYGNUS_LCPLL0_SDIO_CLK
+    usb_phy    lcpll0           3       BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK
+    smart_card lcpll0           4       BCM_CYGNUS_LCPLL0_SMART_CARD_CLK
+    ch5        lcpll0           5       BCM_CYGNUS_LCPLL0_CH5_UNUSED
+
+    ch0_unused mipipll          0       BCM_CYGNUS_MIPIPLL_CH0_UNUSED
+    ch1_lcd    mipipll          1       BCM_CYGNUS_MIPIPLL_CH1_LCD
+    ch2_unused mipipll          2       BCM_CYGNUS_MIPIPLL_CH2_UNUSED
+    ch3_unused mipipll          3       BCM_CYGNUS_MIPIPLL_CH3_UNUSED
+    ch4_unused mipipll          4       BCM_CYGNUS_MIPIPLL_CH4_UNUSED
+    ch5_unused mipipll          5       BCM_CYGNUS_MIPIPLL_CH5_UNUSED
-- 
1.7.9.5

[PATCH v3 1/5] clk: iproc: define Broadcom iProc clock binding

[Ray Jui]

Document the device tree binding for Broadcom iProc architecture based
clock controller

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 brcm,iproc-clocks.txt |  178 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 178 insertions(+)
 create mode 100644 brcm,iproc-clocks.txt

diff --git a/brcm,iproc-clocks.txt b/brcm,iproc-clocks.txt
new file mode 100644
index 0000000..cc64fd2
--- /dev/null
+++ b/brcm,iproc-clocks.txt
@@ -0,0 +1,178 @@
+Broadcom iProc Family Clocks
+
+This binding uses the common clock binding:
+    Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+The iProc clock controller manages clocks that are common to the iProc family.
+An SoC from the iProc family may have several PPLs, e.g., ARMPLL, GENPLL,
+LCPLL0, MIPIPLL, and etc., all derived from an onboard crystal. Each PLL
+comprises of several leaf clocks
+
+Required properties for PLLs:
+- compatible:
+    Should have a value of the form "brcm,<soc>-<pll>". For example, GENPLL on
+Cygnus has a compatible string of "brcm,cygnus-genpll"
+
+- #clock-cells:
+    Must be <0>
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL
+
+- clocks:
+    The input parent clock phandle for the PLL. For all iProc PLLs, this is an
+onboard crystal with a fixed rate
+
+Optional Properties for PLLs:
+- clock-frequency:
+    PLL frequency in Hz. If specified, PLL will be configured to run at
+<clock-frequency> instead of the default frequency after chip reset, provided
+that <clock-frequency> and its parameters are defined in the SoC specific
+frequency parameter table
+
+Example:
+
+	osc: oscillator {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <25000000>;
+	};
+
+	genpll: genpll {
+		#clock-cells = <0>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
+	};
+
+Required properties for leaf clocks of a PLL:
+
+- compatible:
+    Should have a value of the form "brcm,<soc>-<pll>-clk". For example, leaf
+clocks derived from the GENPLL on Cygnus SoC have a compatible string of
+"brcm,cygnus-genpll-clk"
+
+- #clock-cells:
+    Have a value of <1> since there are more than 1 leaf clock of a
+given PLL
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL leaf clocks
+
+- clocks:
+    The input parent PLL phandle for the leaf clock
+
+- clock-output-names:
+    An ordered list of strings defining the names of the leaf clocks
+
+Example:
+
+	genpll: genpll {
+		#clock-cells = <0>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
+	};
+
+	genpll_clks: genpll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-genpll-clk";
+		reg = <0x0301d000 0x2c>;
+		clocks = <&genpll>;
+		clock-output-names = "axi21", "250mhz", "ihost_sys",
+			"enet_sw", "audio_125", "can";
+	};
+
+Required properties for ASIU clocks:
+
+ASIU clocks are a special case. These clocks are derived directly from the
+reference clock of the onboard crystal
+
+- compatible:
+    Should have a value of the form "brcm,<soc>-asiu-clk". For example, ASIU
+clocks for Cygnus have a compatible string of "brcm,cygnus-asiu-clk"
+
+- #clock-cells:
+    Have a value of <1> since there are more than 1 ASIU clocks
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for ASIU clocks
+
+- clocks:
+    The input parent clock phandle for the ASIU clock, i.e., the onboard
+crystal
+
+- clock-output-names:
+    An ordered list of strings defining the names of the ASIU clocks
+
+Example:
+
+	osc: oscillator {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <25000000>;
+	};
+
+	asiu_clks: asiu_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-asiu-clk";
+		reg = <0x0301d048 0xc>,
+			<0x180aa024 0x4>;
+		clocks = <&osc>;
+		clock-output-names = "keypad", "adc/touch", "pwm";
+	};
+
+Cygnus
+------
+PLL and leaf clock compatible strings for Cygnus are:
+    "brcm,cygnus-armpll"
+    "brcm,cygnus-genpll"
+    "brcm,cygnus-lcpll0"
+    "brcm,cygnus-mipipll"
+    "brcm,cygnus-genpll-clk"
+    "brcm,cygnus-lcpll0-clk"
+    "brcm,cygnus-mipipll-clk"
+    "brcm,cygnus-asiu-clk"
+
+The following table defines the set of PLL/clock index and ID for Cygnus.
+These clock IDs are defined in:
+    "include/dt-bindings/clock/bcm-cygnus.h"
+
+    Clock      Source           Index   ID
+    ---        -----            -----   ---------
+    crystal    N/A              N/A     N/A
+
+    armpll     crystal          N/A     N/A
+    genpll     crystal          N/A     N/A
+    lcpll0     crystal          N/A     N/A
+    mipipll    crystal          N/A     N/A
+
+    keypad     crystal (ASIU)   0       BCM_CYGNUS_ASIU_KEYPAD_CLK
+    adc/tsc    crystal (ASIU)   1       BCM_CYGNUS_ASIU_ADC_CLK
+    pwm        crystal (ASIU)   2       BCM_CYGNUS_ASIU_PWM_CLK
+
+    axi21      genpll           0       BCM_CYGNUS_GENPLL_AXI21_CLK
+    250mhz     genpll           1       BCM_CYGNUS_GENPLL_250MHZ_CLK
+    ihost_sys  genpll           2       BCM_CYGNUS_GENPLL_IHOST_SYS_CLK
+    enet_sw    genpll           3       BCM_CYGNUS_GENPLL_ENET_SW_CLK
+    audio_125  genpll           4       BCM_CYGNUS_GENPLL_AUDIO_125_CLK
+    can        genpll           5       BCM_CYGNUS_GENPLL_CAN_CLK
+
+    pcie_phy   lcpll0           0       BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK
+    ddr_phy    lcpll0           1       BCM_CYGNUS_LCPLL0_DDR_PHY_CLK
+    sdio       lcpll0           2       BCM_CYGNUS_LCPLL0_SDIO_CLK
+    usb_phy    lcpll0           3       BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK
+    smart_card lcpll0           4       BCM_CYGNUS_LCPLL0_SMART_CARD_CLK
+    ch5        lcpll0           5       BCM_CYGNUS_LCPLL0_CH5_UNUSED
+
+    ch0_unused mipipll          0       BCM_CYGNUS_MIPIPLL_CH0_UNUSED
+    ch1_lcd    mipipll          1       BCM_CYGNUS_MIPIPLL_CH1_LCD
+    ch2_unused mipipll          2       BCM_CYGNUS_MIPIPLL_CH2_UNUSED
+    ch3_unused mipipll          3       BCM_CYGNUS_MIPIPLL_CH3_UNUSED
+    ch4_unused mipipll          4       BCM_CYGNUS_MIPIPLL_CH4_UNUSED
+    ch5_unused mipipll          5       BCM_CYGNUS_MIPIPLL_CH5_UNUSED
-- 
1.7.9.5

[PATCH v3 2/5] clk: iproc: add initial common clock support

[Ray Jui]

This adds basic and generic support for various iProc PLLs and clocks
including the ARMPLL, GENPLL, LCPLL, MIPIPLL, and ASIU clocks.

SoCs under the iProc architecture can define their specific register
offsets and clock parameters for their PLL and clock controllers. These
parameters can be passed as arugments into the generic iProc PLL and
clock setup functions

Derived from code originally provided by Jonathan Richardson
<jonathar@broadcom.com>

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/clk/bcm/Kconfig            |    9 +
 drivers/clk/bcm/Makefile           |    1 +
 drivers/clk/bcm/clk-iproc-armpll.c |  286 +++++++++++++++++++++
 drivers/clk/bcm/clk-iproc-asiu.c   |  275 ++++++++++++++++++++
 drivers/clk/bcm/clk-iproc-clk.c    |  238 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-pll.c    |  483 ++++++++++++++++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc.h        |  155 ++++++++++++
 7 files changed, 1447 insertions(+)
 create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
 create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
 create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
 create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
 create mode 100644 drivers/clk/bcm/clk-iproc.h

diff --git a/drivers/clk/bcm/Kconfig b/drivers/clk/bcm/Kconfig
index 75506e5..66b5b7f 100644
--- a/drivers/clk/bcm/Kconfig
+++ b/drivers/clk/bcm/Kconfig
@@ -7,3 +7,12 @@ config CLK_BCM_KONA
 	  Enable common clock framework support for Broadcom SoCs
 	  using "Kona" style clock control units, including those
 	  in the BCM281xx and BCM21664 families.
+
+config COMMON_CLK_IPROC
+	bool "Broadcom iProc clock support"
+	depends on ARCH_BCM_IPROC
+	depends on COMMON_CLK
+	default y
+	help
+	  Enable common clock framework support for Broadcom SoCs
+	  based on the "iProc" architecture
diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
index 6297d05..6926636 100644
--- a/drivers/clk/bcm/Makefile
+++ b/drivers/clk/bcm/Makefile
@@ -2,3 +2,4 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
+obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
diff --git a/drivers/clk/bcm/clk-iproc-armpll.c b/drivers/clk/bcm/clk-iproc-armpll.c
new file mode 100644
index 0000000..ec9b130
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-armpll.c
@@ -0,0 +1,286 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+
+#define IPROC_CLK_MAX_FREQ_POLICY                    0x3
+#define IPROC_CLK_POLICY_FREQ_OFFSET                 0x008
+#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT      8
+#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK       0x7
+
+#define IPROC_CLK_PLLARMA_OFFSET                     0xc00
+#define IPROC_CLK_PLLARMA_LOCK_SHIFT                 28
+#define IPROC_CLK_PLLARMA_PDIV_SHIFT                 24
+#define IPROC_CLK_PLLARMA_PDIV_MASK                  0xf
+#define IPROC_CLK_PLLARMA_NDIV_INT_SHIFT             8
+#define IPROC_CLK_PLLARMA_NDIV_INT_MASK              0x3ff
+
+#define IPROC_CLK_PLLARMB_OFFSET                     0xc04
+#define IPROC_CLK_PLLARMB_NDIV_FRAC_MASK             0xfffff
+
+#define IPROC_CLK_PLLARMC_OFFSET                     0xc08
+#define IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT            8
+#define IPROC_CLK_PLLARMC_MDIV_MASK                  0xff
+
+#define IPROC_CLK_PLLARMCTL5_OFFSET                  0xc20
+#define IPROC_CLK_PLLARMCTL5_H_MDIV_MASK             0xff
+
+#define IPROC_CLK_PLLARM_OFFSET_OFFSET               0xc24
+#define IPROC_CLK_PLLARM_SW_CTL_SHIFT                29
+#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT       20
+#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK        0xff
+#define IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK       0xfffff
+
+#define IPROC_CLK_ARM_DIV_OFFSET                     0xe00
+#define IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT  4
+#define IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK        0xf
+
+#define IPROC_CLK_POLICY_DBG_OFFSET                  0xec0
+#define IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT          12
+#define IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK           0x7
+
+enum iproc_arm_pll_fid {
+	ARM_PLL_FID_CRYSTAL_CLK   = 0,
+	ARM_PLL_FID_SYS_CLK       = 2,
+	ARM_PLL_FID_CH0_SLOW_CLK  = 6,
+	ARM_PLL_FID_CH1_FAST_CLK  = 7
+};
+
+struct iproc_arm_pll {
+	struct clk_hw hw;
+	void __iomem *base;
+	struct clk_onecell_data clk_data;
+	unsigned long rate;
+};
+
+#define to_iproc_arm_pll(hw) container_of(hw, struct iproc_arm_pll, hw)
+
+static unsigned int __get_fid(struct iproc_arm_pll *pll)
+{
+	u32 val;
+	unsigned int policy, fid, active_fid;
+
+	val = readl(pll->base + IPROC_CLK_ARM_DIV_OFFSET);
+	if (val & (1 << IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT))
+		policy = val & IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK;
+	else
+		policy = 0;
+
+	/* something is seriously wrong */
+	BUG_ON(policy > IPROC_CLK_MAX_FREQ_POLICY);
+
+	val = readl(pll->base + IPROC_CLK_POLICY_FREQ_OFFSET);
+	fid = (val >> (IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT * policy)) &
+		IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK;
+
+	val = readl(pll->base + IPROC_CLK_POLICY_DBG_OFFSET);
+	active_fid = IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK &
+		(val >> IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT);
+	if (fid != active_fid) {
+		pr_debug("%s: fid override %u->%u\n", __func__,	fid,
+				active_fid);
+		fid = active_fid;
+	}
+
+	pr_debug("%s: active fid: %u\n", __func__, fid);
+
+	return fid;
+}
+
+/*
+ * Determine the mdiv (post divider) based on the frequency ID being used.
+ * There are 4 sources that can be used to derive the output clock rate:
+ *    - 25 MHz Crystal
+ *    - System clock
+ *    - PLL channel 0 (slow clock)
+ *    - PLL channel 1 (fast clock)
+ */
+static int __get_mdiv(struct iproc_arm_pll *pll)
+{
+	unsigned int fid;
+	int mdiv;
+	u32 val;
+
+	fid = __get_fid(pll);
+
+	switch (fid) {
+	case ARM_PLL_FID_CRYSTAL_CLK:
+	case ARM_PLL_FID_SYS_CLK:
+		mdiv = 1;
+		break;
+
+	case ARM_PLL_FID_CH0_SLOW_CLK:
+		val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
+		mdiv = val & IPROC_CLK_PLLARMC_MDIV_MASK;
+		if (mdiv == 0)
+			mdiv = 256;
+		break;
+
+	case ARM_PLL_FID_CH1_FAST_CLK:
+		val = readl(pll->base +	IPROC_CLK_PLLARMCTL5_OFFSET);
+		mdiv = val & IPROC_CLK_PLLARMCTL5_H_MDIV_MASK;
+		if (mdiv == 0)
+			mdiv = 256;
+		break;
+
+	default:
+		mdiv = -EFAULT;
+	}
+
+	return mdiv;
+}
+
+static unsigned int __get_ndiv(struct iproc_arm_pll *pll)
+{
+	u32 val;
+	unsigned int ndiv_int, ndiv_frac, ndiv;
+
+	val = readl(pll->base + IPROC_CLK_PLLARM_OFFSET_OFFSET);
+	if (val & (1 << IPROC_CLK_PLLARM_SW_CTL_SHIFT)) {
+		/*
+		 * offset mode is active. Read the ndiv from the PLLARM OFFSET
+		 * register
+		 */
+		ndiv_int = (val >> IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT) &
+			IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK;
+		if (ndiv_int == 0)
+			ndiv_int = 256;
+
+		ndiv_frac = val & IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK;
+	} else {
+		/* offset mode not active */
+		val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
+		ndiv_int = (val >> IPROC_CLK_PLLARMA_NDIV_INT_SHIFT) &
+			IPROC_CLK_PLLARMA_NDIV_INT_MASK;
+		if (ndiv_int == 0)
+			ndiv_int = 1024;
+
+		val = readl(pll->base + IPROC_CLK_PLLARMB_OFFSET);
+		ndiv_frac = val & IPROC_CLK_PLLARMB_NDIV_FRAC_MASK;
+	}
+
+	ndiv = (ndiv_int << 20) | ndiv_frac;
+
+	return ndiv;
+}
+
+/*
+ * The output frequency of the ARM PLL is calculated based on the ARM PLL
+ * divider values:
+ *   pdiv = ARM PLL pre-divider
+ *   ndiv = ARM PLL multiplier
+ *   mdiv = ARM PLL post divider
+ *
+ * The frequency is calculated by:
+ *   ((ndiv * parent clock rate) / pdiv) / mdiv
+ */
+static unsigned long iproc_arm_pll_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_arm_pll *pll = to_iproc_arm_pll(hw);
+	u32 val;
+	int mdiv;
+	u64 ndiv;
+	unsigned int pdiv;
+
+	/* in bypass mode, use parent rate */
+	val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
+	if (val & (1 << IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT)) {
+		pll->rate = parent_rate;
+		return pll->rate;
+	}
+
+	/* PLL needs to be locked */
+	val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
+	if (!(val & (1 << IPROC_CLK_PLLARMA_LOCK_SHIFT))) {
+		pll->rate = 0;
+		return 0;
+	}
+
+	pdiv = (val >> IPROC_CLK_PLLARMA_PDIV_SHIFT) &
+		IPROC_CLK_PLLARMA_PDIV_MASK;
+	if (pdiv == 0)
+		pdiv = 16;
+
+	ndiv = __get_ndiv(pll);
+	mdiv = __get_mdiv(pll);
+	if (mdiv <= 0) {
+		pll->rate = 0;
+		return 0;
+	}
+	pll->rate = (ndiv * parent_rate) >> 20;
+	pll->rate = (pll->rate / pdiv) / mdiv;
+
+	pr_debug("%s: ARM PLL rate: %lu. parent rate: %lu\n", __func__,
+			pll->rate, parent_rate);
+	pr_debug("%s: ndiv_int: %u, pdiv: %u, mdiv: %d\n", __func__,
+			(unsigned int)(ndiv >> 20), pdiv, mdiv);
+
+	return pll->rate;
+}
+
+static const struct clk_ops iproc_arm_pll_ops = {
+	.recalc_rate = iproc_arm_pll_recalc_rate,
+};
+
+void __init iproc_armpll_setup(struct device_node *node)
+{
+	int ret;
+	struct clk *clk;
+	struct iproc_arm_pll *pll;
+	struct clk_init_data init;
+	const char *parent_name;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->base = of_iomap(node, 0);
+	if (WARN_ON(!pll->base))
+		goto err_free_pll;
+
+	init.name = node->name;
+	init.ops = &iproc_arm_pll_ops;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	pll->hw.init = &init;
+
+	clk = clk_register(NULL, &pll->hw);
+	if (WARN_ON(IS_ERR(clk)))
+		goto err_iounmap;
+
+	pll->clk_data.clk_num = 1;
+	pll->clk_data.clks = &clk;
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_unregister;
+
+	return;
+
+err_clk_unregister:
+	clk_unregister(clk);
+err_iounmap:
+	iounmap(pll->base);
+err_free_pll:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc-asiu.c b/drivers/clk/bcm/clk-iproc-asiu.c
new file mode 100644
index 0000000..ab86b8c
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-asiu.c
@@ -0,0 +1,275 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+struct iproc_asiu;
+
+struct iproc_asiu_clk {
+	struct clk_hw hw;
+	const char *name;
+	struct iproc_asiu *asiu;
+	unsigned long rate;
+	struct iproc_asiu_div div;
+	struct iproc_asiu_gate gate;
+};
+
+struct iproc_asiu {
+	void __iomem *div_base;
+	void __iomem *gate_base;
+
+	struct clk_onecell_data clk_data;
+	struct iproc_asiu_clk *clks;
+};
+
+#define to_asiu_clk(hw) container_of(hw, struct iproc_asiu_clk, hw)
+
+static int iproc_asiu_clk_enable(struct clk_hw *hw)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+
+	/* some clocks at the ASIU level are always enabled */
+	if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
+		return 0;
+
+	val = readl(asiu->gate_base + clk->gate.offset);
+	val |= (1 << clk->gate.en_shift);
+	writel(val, asiu->gate_base + clk->gate.offset);
+
+	return 0;
+}
+
+static void iproc_asiu_clk_disable(struct clk_hw *hw)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+
+	/* some clocks at the ASIU level are always enabled */
+	if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
+		return;
+
+	val = readl(asiu->gate_base + clk->gate.offset);
+	val &= ~(1 << clk->gate.en_shift);
+	writel(val, asiu->gate_base + clk->gate.offset);
+}
+
+static unsigned long iproc_asiu_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+	unsigned int div_h, div_l;
+
+	if (parent_rate == 0) {
+		clk->rate = 0;
+		return 0;
+	}
+
+	/* if clock divisor is not enabled, simply return parent rate */
+	val = readl(asiu->div_base + clk->div.offset);
+	if ((val & (1 << clk->div.en_shift)) == 0) {
+		clk->rate = parent_rate;
+		return parent_rate;
+	}
+
+	/* clock rate = parent rate / (high_div + 1) + (low_div + 1) */
+	div_h = (val >> clk->div.high_shift) & bit_mask(clk->div.high_width);
+	div_h++;
+	div_l = (val >> clk->div.low_shift) & bit_mask(clk->div.low_width);
+	div_l++;
+
+	clk->rate = parent_rate / (div_h + div_l);
+	pr_debug("%s: rate: %lu. parent rate: %lu div_h: %u div_l: %u\n",
+		__func__, clk->rate, parent_rate, div_h, div_l);
+
+	return clk->rate;
+}
+
+static long iproc_asiu_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	unsigned int div;
+
+	if (rate == 0 || *parent_rate == 0)
+		return -EINVAL;
+
+	if (rate == *parent_rate)
+		return *parent_rate;
+
+	div = DIV_ROUND_UP(*parent_rate, rate);
+	if (div < 2)
+		return *parent_rate;
+
+	return *parent_rate / div;
+}
+
+static int iproc_asiu_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	unsigned int div, div_h, div_l;
+	u32 val;
+
+	if (rate == 0 || parent_rate == 0)
+		return -EINVAL;
+
+	/* simply disable the divisor if one wants the same rate as parent */
+	if (rate == parent_rate) {
+		val = readl(asiu->div_base + clk->div.offset);
+		val &= ~(1 << clk->div.en_shift);
+		writel(val, asiu->div_base + clk->div.offset);
+		return 0;
+	}
+
+	div = DIV_ROUND_UP(parent_rate, rate);
+	if (div < 2)
+		return -EINVAL;
+
+	div_h = div_l = div >> 1;
+	div_h--;
+	div_l--;
+
+	val = readl(asiu->div_base + clk->div.offset);
+	val |= 1 << clk->div.en_shift;
+	if (div_h) {
+		val &= ~(bit_mask(clk->div.high_width)
+				<< clk->div.high_shift);
+		val |= div_h << clk->div.high_shift;
+	} else {
+		val &= ~(bit_mask(clk->div.high_width)
+				<< clk->div.high_shift);
+	}
+	if (div_l) {
+		val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
+		val |= div_l << clk->div.low_shift;
+	} else {
+		val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
+	}
+	writel(val, asiu->div_base + clk->div.offset);
+
+	return 0;
+}
+
+static const struct clk_ops iproc_asiu_ops = {
+	.enable = iproc_asiu_clk_enable,
+	.disable = iproc_asiu_clk_disable,
+	.recalc_rate = iproc_asiu_clk_recalc_rate,
+	.round_rate = iproc_asiu_clk_round_rate,
+	.set_rate = iproc_asiu_clk_set_rate,
+};
+
+void __init iproc_asiu_setup(struct device_node *node,
+		const struct iproc_asiu_div *div,
+		const struct iproc_asiu_gate *gate, unsigned int num_clks)
+{
+	int i, ret;
+	struct iproc_asiu *asiu;
+
+	if (WARN_ON(!gate || !div))
+		return;
+
+	asiu = kzalloc(sizeof(*asiu), GFP_KERNEL);
+	if (WARN_ON(!asiu))
+		return;
+
+	asiu->clk_data.clk_num = num_clks;
+	asiu->clk_data.clks = kcalloc(num_clks, sizeof(*asiu->clk_data.clks),
+			GFP_KERNEL);
+	if (WARN_ON(!asiu->clk_data.clks))
+		goto err_clks;
+
+	asiu->clks = kcalloc(num_clks, sizeof(*asiu->clks), GFP_KERNEL);
+	if (WARN_ON(!asiu->clks))
+		goto err_asiu_clks;
+
+	asiu->div_base = of_iomap(node, 0);
+	if (WARN_ON(!asiu->div_base))
+		goto err_iomap_div;
+
+	asiu->gate_base = of_iomap(node, 1);
+	if (WARN_ON(!asiu->gate_base))
+		goto err_iomap_gate;
+
+	for (i = 0; i < num_clks; i++) {
+		struct clk_init_data init;
+		struct clk *clk;
+		const char *parent_name;
+		struct iproc_asiu_clk *asiu_clk;
+		const char *clk_name;
+
+		clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
+		if (WARN_ON(!clk_name))
+			goto err_clk_register;
+
+		ret = of_property_read_string_index(node, "clock-output-names",
+				i, &clk_name);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+
+		asiu_clk = &asiu->clks[i];
+		asiu_clk->name = clk_name;
+		asiu_clk->asiu = asiu;
+		asiu_clk->div = div[i];
+		asiu_clk->gate = gate[i];
+		init.name = clk_name;
+		init.ops = &iproc_asiu_ops;
+		init.flags = 0;
+		parent_name = of_clk_get_parent_name(node, 0);
+		init.parent_names = (parent_name ? &parent_name : NULL);
+		init.num_parents = (parent_name ? 1 : 0);
+		asiu_clk->hw.init = &init;
+
+		clk = clk_register(NULL, &asiu_clk->hw);
+		if (WARN_ON(IS_ERR(clk)))
+			goto err_clk_register;
+		asiu->clk_data.clks[i] = clk;
+	}
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get,
+			&asiu->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_register;
+
+	return;
+
+err_clk_register:
+	for (i = 0; i < num_clks; i++)
+		kfree(asiu->clks[i].name);
+	iounmap(asiu->gate_base);
+
+err_iomap_gate:
+	iounmap(asiu->div_base);
+
+err_iomap_div:
+	kfree(asiu->clks);
+
+err_asiu_clks:
+	kfree(asiu->clk_data.clks);
+
+err_clks:
+	kfree(asiu);
+}
diff --git a/drivers/clk/bcm/clk-iproc-clk.c b/drivers/clk/bcm/clk-iproc-clk.c
new file mode 100644
index 0000000..be3c42c
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-clk.c
@@ -0,0 +1,238 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+struct iproc_pll;
+
+struct iproc_clk {
+	struct clk_hw hw;
+	const char *name;
+	struct iproc_pll *pll;
+	unsigned long rate;
+	const struct iproc_clk_ctrl *ctrl;
+};
+
+struct iproc_pll {
+	void __iomem *base;
+	struct clk_onecell_data clk_data;
+	struct iproc_clk *clks;
+};
+
+#define to_iproc_clk(hw) container_of(hw, struct iproc_clk, hw)
+
+static int iproc_clk_enable(struct clk_hw *hw)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+
+	/* channel enable is active low */
+	val = readl(pll->base + ctrl->enable.offset);
+	val &= ~(1 << ctrl->enable.enable_shift);
+	writel(val, pll->base + ctrl->enable.offset);
+
+	/* also make sure channel is not held */
+	val = readl(pll->base + ctrl->enable.offset);
+	val &= ~(1 << ctrl->enable.hold_shift);
+	writel(val, pll->base + ctrl->enable.offset);
+
+	return 0;
+}
+
+static void iproc_clk_disable(struct clk_hw *hw)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+
+	if (ctrl->flags & IPROC_CLK_AON)
+		return;
+
+	val = readl(pll->base + ctrl->enable.offset);
+	val |= 1 << ctrl->enable.enable_shift;
+	writel(val, pll->base + ctrl->enable.offset);
+}
+
+static unsigned long iproc_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+	unsigned int mdiv;
+
+	if (parent_rate == 0)
+		return 0;
+
+	val = readl(pll->base + ctrl->mdiv.offset);
+	mdiv = (val >> ctrl->mdiv.shift) & bit_mask(ctrl->mdiv.width);
+	if (mdiv == 0)
+		mdiv = 256;
+
+	clk->rate = parent_rate / mdiv;
+
+	return clk->rate;
+}
+
+static long iproc_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	unsigned int div;
+
+	if (rate == 0 || *parent_rate == 0)
+		return -EINVAL;
+
+	if (rate == *parent_rate)
+		return *parent_rate;
+
+	div = DIV_ROUND_UP(*parent_rate, rate);
+	if (div < 2)
+		return *parent_rate;
+
+	if (div > 256)
+		div = 256;
+
+	return *parent_rate / div;
+}
+
+static int iproc_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+	unsigned int div;
+
+	if (rate == 0 || parent_rate == 0)
+		return -EINVAL;
+
+	div = DIV_ROUND_UP(parent_rate, rate);
+	if (div > 256)
+		return -EINVAL;
+
+	val = readl(pll->base + ctrl->mdiv.offset);
+	if (div == 256) {
+		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
+	} else {
+		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
+		val |= div << ctrl->mdiv.shift;
+	}
+	writel(val, pll->base + ctrl->mdiv.offset);
+	clk->rate = parent_rate / div;
+
+	return 0;
+}
+
+static const struct clk_ops iproc_clk_ops = {
+	.enable = iproc_clk_enable,
+	.disable = iproc_clk_disable,
+	.recalc_rate = iproc_clk_recalc_rate,
+	.round_rate = iproc_clk_round_rate,
+	.set_rate = iproc_clk_set_rate,
+};
+
+void __init iproc_clk_setup(struct device_node *node,
+		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks)
+{
+	int i, ret;
+	struct iproc_pll *pll;
+
+	if (WARN_ON(!ctrl))
+		return;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->clk_data.clk_num = num_clks;
+	pll->clk_data.clks = kcalloc(num_clks, sizeof(*pll->clk_data.clks),
+			GFP_KERNEL);
+	if (WARN_ON(!pll->clk_data.clks))
+		goto err_clks;
+
+	pll->clks = kcalloc(num_clks, sizeof(*pll->clks), GFP_KERNEL);
+	if (WARN_ON(!pll->clks))
+		goto err_pll_clks;
+
+	pll->base = of_iomap(node, 0);
+	if (WARN_ON(!pll->base))
+		goto err_iomap;
+
+	for (i = 0; i < num_clks; i++) {
+		struct clk_init_data init;
+		struct clk *clk;
+		const char *parent_name;
+		struct iproc_clk *iclk;
+		const char *clk_name;
+
+		clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
+		if (WARN_ON(!clk_name))
+			goto err_clk_register;
+
+		ret = of_property_read_string_index(node, "clock-output-names",
+				i, &clk_name);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+
+		iclk = &pll->clks[i];
+		iclk->name = clk_name;
+		iclk->pll = pll;
+		iclk->ctrl = &ctrl[i];
+		init.name = clk_name;
+		init.ops = &iproc_clk_ops;
+		init.flags = 0;
+		parent_name = of_clk_get_parent_name(node, 0);
+		init.parent_names = (parent_name ? &parent_name : NULL);
+		init.num_parents = (parent_name ? 1 : 0);
+		iclk->hw.init = &init;
+
+		clk = clk_register(NULL, &iclk->hw);
+		if (WARN_ON(IS_ERR(clk)))
+			goto err_clk_register;
+		pll->clk_data.clks[i] = clk;
+	}
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_register;
+
+	return;
+
+err_clk_register:
+	for (i = 0; i < num_clks; i++)
+		kfree(pll->clks[i].name);
+	iounmap(pll->base);
+
+err_iomap:
+	kfree(pll->clks);
+
+err_pll_clks:
+	kfree(pll->clk_data.clks);
+
+err_clks:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc-pll.c b/drivers/clk/bcm/clk-iproc-pll.c
new file mode 100644
index 0000000..cd3bd38
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-pll.c
@@ -0,0 +1,483 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+#define PLL_VCO_HIGH_SHIFT 19
+#define PLL_VCO_LOW_SHIFT  30
+
+/* number of delay loops waiting for PLL to lock */
+#define LOCK_DELAY 100
+
+/* number of VCO frequency bands */
+#define NUM_FREQ_BANDS 8
+
+#define NUM_KP_BANDS 3
+enum kp_band {
+	KP_BAND_MID = 0,
+	KP_BAND_HIGH,
+	KP_BAND_HIGH_HIGH
+};
+
+static const unsigned int kp_table[NUM_KP_BANDS][NUM_FREQ_BANDS] = {
+	{ 5, 6, 6, 7, 7, 8, 9, 10 },
+	{ 4, 4, 5, 5, 6, 7, 8, 9  },
+	{ 4, 5, 5, 6, 7, 8, 9, 10 },
+};
+
+static const unsigned long ref_freq_table[NUM_FREQ_BANDS][2] = {
+	{ 10000000,  12500000  },
+	{ 12500000,  15000000  },
+	{ 15000000,  20000000  },
+	{ 20000000,  25000000  },
+	{ 25000000,  50000000  },
+	{ 50000000,  75000000  },
+	{ 75000000,  100000000 },
+	{ 100000000, 125000000 },
+};
+
+enum vco_freq_range {
+	VCO_LOW       = 700000000U,
+	VCO_MID       = 1200000000U,
+	VCO_HIGH      = 2200000000U,
+	VCO_HIGH_HIGH = 3100000000U,
+	VCO_MAX       = 4000000000U,
+};
+
+struct iproc_pll {
+	struct clk_hw hw;
+	void __iomem *pll_base;
+	void __iomem *pwr_base;
+	void __iomem *asiu_base;
+	struct clk_onecell_data clk_data;
+	const char *name;
+	const struct iproc_pll_ctrl *ctrl;
+	const struct iproc_pll_vco_freq_param *vco_param;
+	unsigned int num_vco_entries;
+	unsigned long rate;
+};
+
+#define to_iproc_pll(hw) container_of(hw, struct iproc_pll, hw)
+
+/*
+ * Get the clock rate based on name
+ */
+static unsigned long __get_rate(const char *clk_name)
+{
+	struct clk *clk;
+
+	clk = __clk_lookup(clk_name);
+	if (!clk) {
+		pr_err("%s: unable to find clock by name: %s\n", __func__,
+				clk_name);
+		return 0;
+	}
+
+	return clk_get_rate(clk);
+}
+
+/*
+ * Based on the target frequency, find a match from the VCO frequency parameter
+ * table and return its index
+ */
+static int pll_get_rate_index(struct iproc_pll *pll, unsigned int target_rate)
+{
+	int i;
+
+	for (i = 0; i < pll->num_vco_entries; i++)
+		if (target_rate == pll->vco_param[i].rate)
+			break;
+
+	if (i >= pll->num_vco_entries)
+		return -EINVAL;
+
+	return i;
+}
+
+static int get_kp(unsigned long ref_freq, enum kp_band kp_index)
+{
+	int i;
+
+	if (ref_freq < ref_freq_table[0][0])
+		return -EINVAL;
+
+	for (i = 0; i < NUM_FREQ_BANDS; i++) {
+		if (ref_freq >= ref_freq_table[i][0] &&
+			ref_freq < ref_freq_table[i][1])
+			return kp_table[kp_index][i];
+	}
+	return -EINVAL;
+}
+
+static int pll_wait_for_lock(struct iproc_pll *pll)
+{
+	int i;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+
+	for (i = 0; i < LOCK_DELAY; i++) {
+		u32 val = readl(pll->pll_base + ctrl->status.offset);
+
+		if (val & (1 << ctrl->status.shift))
+			return 0;
+		udelay(10);
+	}
+
+	return -EIO;
+}
+
+static void __pll_disable(struct iproc_pll *pll)
+{
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		val = readl(pll->asiu_base + ctrl->asiu.offset);
+		val &= ~(1 << ctrl->asiu.en_shift);
+		writel(val, pll->asiu_base + ctrl->asiu.offset);
+	}
+
+	/* latch input value so core power can be shut down */
+	val = readl(pll->pwr_base + ctrl->aon.offset);
+	val |= (1 << ctrl->aon.iso_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+
+	/* power down the core */
+	val &= ~(bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+}
+
+static int __pll_enable(struct iproc_pll *pll)
+{
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+
+	/* power up the PLL and make sure it's not latched */
+	val = readl(pll->pwr_base + ctrl->aon.offset);
+	val |= bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift;
+	val &= ~(1 << ctrl->aon.iso_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+
+	/* certain PLLs also need to be ungated from the ASIU top level */
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		val = readl(pll->asiu_base + ctrl->asiu.offset);
+		val |= (1 << ctrl->asiu.en_shift);
+		writel(val, pll->asiu_base + ctrl->asiu.offset);
+	}
+
+	return 0;
+}
+
+static void __pll_put_in_reset(struct iproc_pll *pll)
+{
+	u32 val;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
+
+	val = readl(pll->pll_base + reset->offset);
+	val &= ~(1 << reset->reset_shift | 1 << reset->p_reset_shift);
+	writel(val, pll->pll_base + reset->offset);
+}
+
+static void __pll_bring_out_reset(struct iproc_pll *pll, unsigned int kp,
+		unsigned int ka, unsigned int ki)
+{
+	u32 val;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
+
+	val = readl(pll->pll_base + reset->offset);
+	val &= ~(bit_mask(reset->ki_width) << reset->ki_shift |
+		bit_mask(reset->kp_width) << reset->kp_shift |
+		bit_mask(reset->ka_width) << reset->ka_shift);
+	val |=  ki << reset->ki_shift | kp << reset->kp_shift |
+		ka << reset->ka_shift;
+	val |= 1 << reset->reset_shift | 1 << reset->p_reset_shift;
+	writel(val, pll->pll_base + reset->offset);
+}
+
+static int pll_set_rate(struct iproc_pll *pll, unsigned int rate_index,
+		unsigned long parent_rate)
+{
+	const struct iproc_pll_vco_freq_param *vco =
+				&pll->vco_param[rate_index];
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	int ka = 0, ki, kp, ret;
+	unsigned long rate = vco->rate;
+	u32 val;
+	enum kp_band kp_index;
+	unsigned long ref_freq;
+
+	/*
+	 * reference frequency = parent frequency / PDIV
+	 * If PDIV = 0, then it becomes a multiplier (x2)
+	 */
+	if (vco->pdiv == 0)
+		ref_freq = parent_rate * 2;
+	else
+		ref_freq = parent_rate / vco->pdiv;
+
+	/* determine Ki and Kp index based on target VCO frequency */
+	if (rate >= VCO_LOW && rate < VCO_HIGH) {
+		ki = 4;
+		kp_index = KP_BAND_MID;
+	} else if (rate >= VCO_HIGH && rate && rate < VCO_HIGH_HIGH) {
+		ki = 3;
+		kp_index = KP_BAND_HIGH;
+	} else if (rate >= VCO_HIGH_HIGH && rate < VCO_MAX) {
+		ki = 3;
+		kp_index = KP_BAND_HIGH_HIGH;
+	} else {
+		pr_err("%s: pll: %s has invalid rate: %lu\n", __func__,
+				pll->name, rate);
+		return -EINVAL;
+	}
+
+	kp = get_kp(ref_freq, kp_index);
+	if (kp < 0) {
+		pr_err("%s: pll: %s has invalid kp\n", __func__, pll->name);
+		return kp;
+	}
+
+	ret = __pll_enable(pll);
+	if (ret) {
+		pr_err("%s: pll: %s fails to enable\n", __func__, pll->name);
+		return ret;
+	}
+
+	/* put PLL in reset */
+	__pll_put_in_reset(pll);
+
+	writel(0, pll->pll_base + ctrl->vco_ctrl.u_offset);
+	val = readl(pll->pll_base + ctrl->vco_ctrl.l_offset);
+
+	if (rate >= VCO_LOW && rate < VCO_MID)
+		val |= (1 << PLL_VCO_LOW_SHIFT);
+
+	if (rate < VCO_HIGH)
+		val &= ~(1 << PLL_VCO_HIGH_SHIFT);
+	else
+		val |= (1 << PLL_VCO_HIGH_SHIFT);
+
+	writel(val, pll->pll_base + ctrl->vco_ctrl.l_offset);
+
+	/* program integer part of NDIV */
+	val = readl(pll->pll_base + ctrl->ndiv_int.offset);
+	val &= ~(bit_mask(ctrl->ndiv_int.width) << ctrl->ndiv_int.shift);
+	val |= vco->ndiv_int << ctrl->ndiv_int.shift;
+	writel(val, pll->pll_base + ctrl->ndiv_int.offset);
+
+	/* program fractional part of NDIV */
+	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
+		val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
+		val &= ~(bit_mask(ctrl->ndiv_frac.width) <<
+				ctrl->ndiv_frac.shift);
+		val |= vco->ndiv_frac << ctrl->ndiv_frac.shift;
+		writel(val, pll->pll_base + ctrl->ndiv_frac.offset);
+	}
+
+	/* program PDIV */
+	val = readl(pll->pll_base + ctrl->pdiv.offset);
+	val &= ~(bit_mask(ctrl->pdiv.width) << ctrl->pdiv.shift);
+	val |= vco->pdiv << ctrl->pdiv.shift;
+	writel(val, pll->pll_base + ctrl->pdiv.offset);
+
+	__pll_bring_out_reset(pll, kp, ka, ki);
+
+	ret = pll_wait_for_lock(pll);
+	if (ret < 0) {
+		pr_err("%s: pll: %s failed to lock\n", __func__, pll->name);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int iproc_pll_enable(struct clk_hw *hw)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+
+	return __pll_enable(pll);
+}
+
+static void iproc_pll_disable(struct clk_hw *hw)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+
+	if (ctrl->flags & IPROC_CLK_AON)
+		return;
+
+	__pll_disable(pll);
+}
+
+static unsigned long iproc_pll_recalc_rate(struct clk_hw *hw,
+	unsigned long parent_rate)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+	u64 ndiv;
+	unsigned int ndiv_int, ndiv_frac, pdiv;
+
+	if (parent_rate == 0)
+		return 0;
+
+	/* PLL needs to be locked */
+	val = readl(pll->pll_base + ctrl->status.offset);
+	if ((val & (1 << ctrl->status.shift)) == 0) {
+		pll->rate = 0;
+		return 0;
+	}
+
+	/*
+	 * PLL output frequency =
+	 *
+	 * ((ndiv_int + ndiv_frac / 2^20) * (parent clock rate / pdiv)
+	 */
+	val = readl(pll->pll_base + ctrl->ndiv_int.offset);
+	ndiv_int = (val >> ctrl->ndiv_int.shift) &
+		bit_mask(ctrl->ndiv_int.width);
+	ndiv = ndiv_int << ctrl->ndiv_int.shift;
+
+	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
+		val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
+		ndiv_frac = (val >> ctrl->ndiv_frac.shift) &
+			bit_mask(ctrl->ndiv_frac.width);
+
+		if (ndiv_frac != 0)
+			ndiv = (ndiv_int << ctrl->ndiv_int.shift) | ndiv_frac;
+	}
+
+	val = readl(pll->pll_base + ctrl->pdiv.offset);
+	pdiv = (val >> ctrl->pdiv.shift) & bit_mask(ctrl->pdiv.width);
+
+	pll->rate = (ndiv * parent_rate) >> ctrl->ndiv_int.shift;
+
+	if (pdiv == 0)
+		pll->rate *= 2;
+	else
+		pll->rate /= pdiv;
+
+	return pll->rate;
+}
+
+static const struct clk_ops iproc_pll_ops = {
+	.enable = iproc_pll_enable,
+	.disable = iproc_pll_disable,
+	.recalc_rate = iproc_pll_recalc_rate,
+};
+
+void __init iproc_pll_setup(struct device_node *node,
+		const struct iproc_pll_ctrl *ctrl,
+		const struct iproc_pll_vco_freq_param *vco_param,
+		unsigned int num_vco_entries)
+{
+	int ret;
+	struct clk *clk;
+	struct iproc_pll *pll;
+	struct clk_init_data init;
+	const char *parent_name;
+	unsigned int rate;
+
+	if (WARN_ON(!ctrl))
+		return;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->pll_base = of_iomap(node, 0);
+	if (WARN_ON(!pll->pll_base))
+		goto err_pll_iomap;
+
+	pll->pwr_base = of_iomap(node, 1);
+	if (WARN_ON(!pll->pwr_base))
+		goto err_pwr_iomap;
+
+	/* some PLLs require gating control at the top ASIU level */
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		pll->asiu_base = of_iomap(node, 2);
+		if (WARN_ON(!pll->asiu_base))
+			goto err_asiu_iomap;
+	}
+
+	pll->ctrl = ctrl;
+	pll->name = node->name;
+	init.name = node->name;
+	init.ops = &iproc_pll_ops;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	pll->hw.init = &init;
+
+	/* configure the PLL to the desired VCO frequency if specified */
+	ret = of_property_read_u32(node, "clock-frequency", &rate);
+	if (!ret) {
+		unsigned long parent_rate;
+		int rate_index;
+
+		if (WARN_ON(!vco_param))
+			goto err_clk_register;
+
+		pll->num_vco_entries = num_vco_entries;
+		pll->vco_param = vco_param;
+
+		parent_rate = __get_rate(parent_name);
+		if (WARN_ON(!parent_rate))
+			goto err_clk_register;
+
+		rate_index = pll_get_rate_index(pll, rate);
+		if (WARN_ON(rate_index < 0))
+			goto err_clk_register;
+
+		ret = pll_set_rate(pll, rate_index, parent_rate);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+	}
+
+	clk = clk_register(NULL, &pll->hw);
+	if (WARN_ON(IS_ERR(clk)))
+		goto err_clk_register;
+
+	pll->clk_data.clk_num = 1;
+	pll->clk_data.clks = &clk;
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get,
+			&pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_add;
+
+	return;
+
+err_clk_add:
+	clk_unregister(clk);
+err_clk_register:
+	if (pll->asiu_base)
+		iounmap(pll->asiu_base);
+err_asiu_iomap:
+	iounmap(pll->pwr_base);
+err_pwr_iomap:
+	iounmap(pll->pll_base);
+err_pll_iomap:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc.h b/drivers/clk/bcm/clk-iproc.h
new file mode 100644
index 0000000..4aa0479
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc.h
@@ -0,0 +1,155 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _CLK_IPROC_H
+#define _CLK_IPROC_H
+
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/of.h>
+#include <linux/clk-provider.h>
+
+#define IPROC_CLK_NAME_LEN 25
+#define IPROC_CLK_INVALID_OFFSET 0xffffffff
+#define bit_mask(width) ((1 << (width)) - 1)
+
+/* clock should not be disabled at runtime */
+#define IPROC_CLK_AON BIT(0)
+
+/* PLL requires gating through ASIU */
+#define IPROC_CLK_PLL_ASIU BIT(1)
+
+/* PLL has fractional part of the NDIV */
+#define IPROC_CLK_PLL_HAS_NDIV_FRAC BIT(2)
+
+/*
+ * Parameters for VCO frequency configuration
+ *
+ * VCO frequency =
+ * ((ndiv_int + ndiv_frac / 2^20) * (ref freqeuncy  / pdiv)
+ */
+struct iproc_pll_vco_freq_param {
+	unsigned long rate;
+	unsigned int ndiv_int;
+	unsigned int ndiv_frac;
+	unsigned int pdiv;
+};
+
+struct iproc_clk_reg_op {
+	unsigned int offset;
+	unsigned int shift;
+	unsigned int width;
+};
+
+/*
+ * Clock gating control at the top ASIU level
+ */
+struct iproc_asiu_gate {
+	unsigned int offset;
+	unsigned int en_shift;
+};
+
+/*
+ * Control of powering on/off of a PLL
+ *
+ * Before powering off a PLL, input isolation (ISO) needs to be enabled
+ */
+struct iproc_pll_aon_pwr_ctrl {
+	unsigned int offset;
+	unsigned int pwr_width;
+	unsigned int pwr_shift;
+	unsigned int iso_shift;
+};
+
+/*
+ * Control of the PLL reset, with Ki, Kp, and Ka parameters
+ */
+struct iproc_pll_reset_ctrl {
+	unsigned int offset;
+	unsigned int reset_shift;
+	unsigned int p_reset_shift;
+	unsigned int ki_shift;
+	unsigned int ki_width;
+	unsigned int kp_shift;
+	unsigned int kp_width;
+	unsigned int ka_shift;
+	unsigned int ka_width;
+};
+
+struct iproc_pll_vco_ctrl {
+	unsigned int u_offset;
+	unsigned int l_offset;
+};
+
+/*
+ * Main PLL control parameters
+ */
+struct iproc_pll_ctrl {
+	unsigned long flags;
+	struct iproc_pll_aon_pwr_ctrl aon;
+	struct iproc_asiu_gate asiu;
+	struct iproc_pll_reset_ctrl reset;
+	struct iproc_clk_reg_op ndiv_int;
+	struct iproc_clk_reg_op ndiv_frac;
+	struct iproc_clk_reg_op pdiv;
+	struct iproc_pll_vco_ctrl vco_ctrl;
+	struct iproc_clk_reg_op status;
+};
+
+/*
+ * Controls enabling/disabling a PLL derived clock
+ */
+struct iproc_clk_enable_ctrl {
+	unsigned int offset;
+	unsigned int enable_shift;
+	unsigned int hold_shift;
+	unsigned int bypass_shift;
+};
+
+/*
+ * Main clock control parameters for clocks derived from the PLLs
+ */
+struct iproc_clk_ctrl {
+	unsigned int channel;
+	unsigned long flags;
+	struct iproc_clk_enable_ctrl enable;
+	struct iproc_clk_reg_op mdiv;
+};
+
+/*
+ * Divisor of the ASIU clocks
+ */
+struct iproc_asiu_div {
+	unsigned int offset;
+	unsigned int en_shift;
+	unsigned int high_shift;
+	unsigned int high_width;
+	unsigned int low_shift;
+	unsigned int low_width;
+};
+
+extern void __init iproc_armpll_setup(struct device_node *node);
+extern void __init iproc_pll_setup(struct device_node *node,
+		const struct iproc_pll_ctrl *ctrl,
+		const struct iproc_pll_vco_freq_param *vco_param,
+		unsigned int num_freqs);
+extern void __init iproc_clk_setup(struct device_node *node,
+		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks);
+extern void __init iproc_asiu_setup(struct device_node *node,
+		const struct iproc_asiu_div *div,
+		const struct iproc_asiu_gate *gate, unsigned int num_clks);
+
+#endif /* _CLK_IPROC_H */
-- 
1.7.9.5

[PATCH v3 2/5] clk: iproc: add initial common clock support

[Ray Jui]

This adds basic and generic support for various iProc PLLs and clocks
including the ARMPLL, GENPLL, LCPLL, MIPIPLL, and ASIU clocks.

SoCs under the iProc architecture can define their specific register
offsets and clock parameters for their PLL and clock controllers. These
parameters can be passed as arugments into the generic iProc PLL and
clock setup functions

Derived from code originally provided by Jonathan Richardson
<jonathar-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>

Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
---
 drivers/clk/bcm/Kconfig            |    9 +
 drivers/clk/bcm/Makefile           |    1 +
 drivers/clk/bcm/clk-iproc-armpll.c |  286 +++++++++++++++++++++
 drivers/clk/bcm/clk-iproc-asiu.c   |  275 ++++++++++++++++++++
 drivers/clk/bcm/clk-iproc-clk.c    |  238 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-pll.c    |  483 ++++++++++++++++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc.h        |  155 ++++++++++++
 7 files changed, 1447 insertions(+)
 create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
 create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
 create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
 create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
 create mode 100644 drivers/clk/bcm/clk-iproc.h

diff --git a/drivers/clk/bcm/Kconfig b/drivers/clk/bcm/Kconfig
index 75506e5..66b5b7f 100644
--- a/drivers/clk/bcm/Kconfig
+++ b/drivers/clk/bcm/Kconfig
@@ -7,3 +7,12 @@ config CLK_BCM_KONA
 	  Enable common clock framework support for Broadcom SoCs
 	  using "Kona" style clock control units, including those
 	  in the BCM281xx and BCM21664 families.
+
+config COMMON_CLK_IPROC
+	bool "Broadcom iProc clock support"
+	depends on ARCH_BCM_IPROC
+	depends on COMMON_CLK
+	default y
+	help
+	  Enable common clock framework support for Broadcom SoCs
+	  based on the "iProc" architecture
diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
index 6297d05..6926636 100644
--- a/drivers/clk/bcm/Makefile
+++ b/drivers/clk/bcm/Makefile
@@ -2,3 +2,4 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
+obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
diff --git a/drivers/clk/bcm/clk-iproc-armpll.c b/drivers/clk/bcm/clk-iproc-armpll.c
new file mode 100644
index 0000000..ec9b130
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-armpll.c
@@ -0,0 +1,286 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+
+#define IPROC_CLK_MAX_FREQ_POLICY                    0x3
+#define IPROC_CLK_POLICY_FREQ_OFFSET                 0x008
+#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT      8
+#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK       0x7
+
+#define IPROC_CLK_PLLARMA_OFFSET                     0xc00
+#define IPROC_CLK_PLLARMA_LOCK_SHIFT                 28
+#define IPROC_CLK_PLLARMA_PDIV_SHIFT                 24
+#define IPROC_CLK_PLLARMA_PDIV_MASK                  0xf
+#define IPROC_CLK_PLLARMA_NDIV_INT_SHIFT             8
+#define IPROC_CLK_PLLARMA_NDIV_INT_MASK              0x3ff
+
+#define IPROC_CLK_PLLARMB_OFFSET                     0xc04
+#define IPROC_CLK_PLLARMB_NDIV_FRAC_MASK             0xfffff
+
+#define IPROC_CLK_PLLARMC_OFFSET                     0xc08
+#define IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT            8
+#define IPROC_CLK_PLLARMC_MDIV_MASK                  0xff
+
+#define IPROC_CLK_PLLARMCTL5_OFFSET                  0xc20
+#define IPROC_CLK_PLLARMCTL5_H_MDIV_MASK             0xff
+
+#define IPROC_CLK_PLLARM_OFFSET_OFFSET               0xc24
+#define IPROC_CLK_PLLARM_SW_CTL_SHIFT                29
+#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT       20
+#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK        0xff
+#define IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK       0xfffff
+
+#define IPROC_CLK_ARM_DIV_OFFSET                     0xe00
+#define IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT  4
+#define IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK        0xf
+
+#define IPROC_CLK_POLICY_DBG_OFFSET                  0xec0
+#define IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT          12
+#define IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK           0x7
+
+enum iproc_arm_pll_fid {
+	ARM_PLL_FID_CRYSTAL_CLK   = 0,
+	ARM_PLL_FID_SYS_CLK       = 2,
+	ARM_PLL_FID_CH0_SLOW_CLK  = 6,
+	ARM_PLL_FID_CH1_FAST_CLK  = 7
+};
+
+struct iproc_arm_pll {
+	struct clk_hw hw;
+	void __iomem *base;
+	struct clk_onecell_data clk_data;
+	unsigned long rate;
+};
+
+#define to_iproc_arm_pll(hw) container_of(hw, struct iproc_arm_pll, hw)
+
+static unsigned int __get_fid(struct iproc_arm_pll *pll)
+{
+	u32 val;
+	unsigned int policy, fid, active_fid;
+
+	val = readl(pll->base + IPROC_CLK_ARM_DIV_OFFSET);
+	if (val & (1 << IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT))
+		policy = val & IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK;
+	else
+		policy = 0;
+
+	/* something is seriously wrong */
+	BUG_ON(policy > IPROC_CLK_MAX_FREQ_POLICY);
+
+	val = readl(pll->base + IPROC_CLK_POLICY_FREQ_OFFSET);
+	fid = (val >> (IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT * policy)) &
+		IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK;
+
+	val = readl(pll->base + IPROC_CLK_POLICY_DBG_OFFSET);
+	active_fid = IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK &
+		(val >> IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT);
+	if (fid != active_fid) {
+		pr_debug("%s: fid override %u->%u\n", __func__,	fid,
+				active_fid);
+		fid = active_fid;
+	}
+
+	pr_debug("%s: active fid: %u\n", __func__, fid);
+
+	return fid;
+}
+
+/*
+ * Determine the mdiv (post divider) based on the frequency ID being used.
+ * There are 4 sources that can be used to derive the output clock rate:
+ *    - 25 MHz Crystal
+ *    - System clock
+ *    - PLL channel 0 (slow clock)
+ *    - PLL channel 1 (fast clock)
+ */
+static int __get_mdiv(struct iproc_arm_pll *pll)
+{
+	unsigned int fid;
+	int mdiv;
+	u32 val;
+
+	fid = __get_fid(pll);
+
+	switch (fid) {
+	case ARM_PLL_FID_CRYSTAL_CLK:
+	case ARM_PLL_FID_SYS_CLK:
+		mdiv = 1;
+		break;
+
+	case ARM_PLL_FID_CH0_SLOW_CLK:
+		val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
+		mdiv = val & IPROC_CLK_PLLARMC_MDIV_MASK;
+		if (mdiv == 0)
+			mdiv = 256;
+		break;
+
+	case ARM_PLL_FID_CH1_FAST_CLK:
+		val = readl(pll->base +	IPROC_CLK_PLLARMCTL5_OFFSET);
+		mdiv = val & IPROC_CLK_PLLARMCTL5_H_MDIV_MASK;
+		if (mdiv == 0)
+			mdiv = 256;
+		break;
+
+	default:
+		mdiv = -EFAULT;
+	}
+
+	return mdiv;
+}
+
+static unsigned int __get_ndiv(struct iproc_arm_pll *pll)
+{
+	u32 val;
+	unsigned int ndiv_int, ndiv_frac, ndiv;
+
+	val = readl(pll->base + IPROC_CLK_PLLARM_OFFSET_OFFSET);
+	if (val & (1 << IPROC_CLK_PLLARM_SW_CTL_SHIFT)) {
+		/*
+		 * offset mode is active. Read the ndiv from the PLLARM OFFSET
+		 * register
+		 */
+		ndiv_int = (val >> IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT) &
+			IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK;
+		if (ndiv_int == 0)
+			ndiv_int = 256;
+
+		ndiv_frac = val & IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK;
+	} else {
+		/* offset mode not active */
+		val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
+		ndiv_int = (val >> IPROC_CLK_PLLARMA_NDIV_INT_SHIFT) &
+			IPROC_CLK_PLLARMA_NDIV_INT_MASK;
+		if (ndiv_int == 0)
+			ndiv_int = 1024;
+
+		val = readl(pll->base + IPROC_CLK_PLLARMB_OFFSET);
+		ndiv_frac = val & IPROC_CLK_PLLARMB_NDIV_FRAC_MASK;
+	}
+
+	ndiv = (ndiv_int << 20) | ndiv_frac;
+
+	return ndiv;
+}
+
+/*
+ * The output frequency of the ARM PLL is calculated based on the ARM PLL
+ * divider values:
+ *   pdiv = ARM PLL pre-divider
+ *   ndiv = ARM PLL multiplier
+ *   mdiv = ARM PLL post divider
+ *
+ * The frequency is calculated by:
+ *   ((ndiv * parent clock rate) / pdiv) / mdiv
+ */
+static unsigned long iproc_arm_pll_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_arm_pll *pll = to_iproc_arm_pll(hw);
+	u32 val;
+	int mdiv;
+	u64 ndiv;
+	unsigned int pdiv;
+
+	/* in bypass mode, use parent rate */
+	val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
+	if (val & (1 << IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT)) {
+		pll->rate = parent_rate;
+		return pll->rate;
+	}
+
+	/* PLL needs to be locked */
+	val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
+	if (!(val & (1 << IPROC_CLK_PLLARMA_LOCK_SHIFT))) {
+		pll->rate = 0;
+		return 0;
+	}
+
+	pdiv = (val >> IPROC_CLK_PLLARMA_PDIV_SHIFT) &
+		IPROC_CLK_PLLARMA_PDIV_MASK;
+	if (pdiv == 0)
+		pdiv = 16;
+
+	ndiv = __get_ndiv(pll);
+	mdiv = __get_mdiv(pll);
+	if (mdiv <= 0) {
+		pll->rate = 0;
+		return 0;
+	}
+	pll->rate = (ndiv * parent_rate) >> 20;
+	pll->rate = (pll->rate / pdiv) / mdiv;
+
+	pr_debug("%s: ARM PLL rate: %lu. parent rate: %lu\n", __func__,
+			pll->rate, parent_rate);
+	pr_debug("%s: ndiv_int: %u, pdiv: %u, mdiv: %d\n", __func__,
+			(unsigned int)(ndiv >> 20), pdiv, mdiv);
+
+	return pll->rate;
+}
+
+static const struct clk_ops iproc_arm_pll_ops = {
+	.recalc_rate = iproc_arm_pll_recalc_rate,
+};
+
+void __init iproc_armpll_setup(struct device_node *node)
+{
+	int ret;
+	struct clk *clk;
+	struct iproc_arm_pll *pll;
+	struct clk_init_data init;
+	const char *parent_name;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->base = of_iomap(node, 0);
+	if (WARN_ON(!pll->base))
+		goto err_free_pll;
+
+	init.name = node->name;
+	init.ops = &iproc_arm_pll_ops;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	pll->hw.init = &init;
+
+	clk = clk_register(NULL, &pll->hw);
+	if (WARN_ON(IS_ERR(clk)))
+		goto err_iounmap;
+
+	pll->clk_data.clk_num = 1;
+	pll->clk_data.clks = &clk;
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_unregister;
+
+	return;
+
+err_clk_unregister:
+	clk_unregister(clk);
+err_iounmap:
+	iounmap(pll->base);
+err_free_pll:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc-asiu.c b/drivers/clk/bcm/clk-iproc-asiu.c
new file mode 100644
index 0000000..ab86b8c
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-asiu.c
@@ -0,0 +1,275 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+struct iproc_asiu;
+
+struct iproc_asiu_clk {
+	struct clk_hw hw;
+	const char *name;
+	struct iproc_asiu *asiu;
+	unsigned long rate;
+	struct iproc_asiu_div div;
+	struct iproc_asiu_gate gate;
+};
+
+struct iproc_asiu {
+	void __iomem *div_base;
+	void __iomem *gate_base;
+
+	struct clk_onecell_data clk_data;
+	struct iproc_asiu_clk *clks;
+};
+
+#define to_asiu_clk(hw) container_of(hw, struct iproc_asiu_clk, hw)
+
+static int iproc_asiu_clk_enable(struct clk_hw *hw)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+
+	/* some clocks at the ASIU level are always enabled */
+	if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
+		return 0;
+
+	val = readl(asiu->gate_base + clk->gate.offset);
+	val |= (1 << clk->gate.en_shift);
+	writel(val, asiu->gate_base + clk->gate.offset);
+
+	return 0;
+}
+
+static void iproc_asiu_clk_disable(struct clk_hw *hw)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+
+	/* some clocks at the ASIU level are always enabled */
+	if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
+		return;
+
+	val = readl(asiu->gate_base + clk->gate.offset);
+	val &= ~(1 << clk->gate.en_shift);
+	writel(val, asiu->gate_base + clk->gate.offset);
+}
+
+static unsigned long iproc_asiu_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+	unsigned int div_h, div_l;
+
+	if (parent_rate == 0) {
+		clk->rate = 0;
+		return 0;
+	}
+
+	/* if clock divisor is not enabled, simply return parent rate */
+	val = readl(asiu->div_base + clk->div.offset);
+	if ((val & (1 << clk->div.en_shift)) == 0) {
+		clk->rate = parent_rate;
+		return parent_rate;
+	}
+
+	/* clock rate = parent rate / (high_div + 1) + (low_div + 1) */
+	div_h = (val >> clk->div.high_shift) & bit_mask(clk->div.high_width);
+	div_h++;
+	div_l = (val >> clk->div.low_shift) & bit_mask(clk->div.low_width);
+	div_l++;
+
+	clk->rate = parent_rate / (div_h + div_l);
+	pr_debug("%s: rate: %lu. parent rate: %lu div_h: %u div_l: %u\n",
+		__func__, clk->rate, parent_rate, div_h, div_l);
+
+	return clk->rate;
+}
+
+static long iproc_asiu_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	unsigned int div;
+
+	if (rate == 0 || *parent_rate == 0)
+		return -EINVAL;
+
+	if (rate == *parent_rate)
+		return *parent_rate;
+
+	div = DIV_ROUND_UP(*parent_rate, rate);
+	if (div < 2)
+		return *parent_rate;
+
+	return *parent_rate / div;
+}
+
+static int iproc_asiu_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	unsigned int div, div_h, div_l;
+	u32 val;
+
+	if (rate == 0 || parent_rate == 0)
+		return -EINVAL;
+
+	/* simply disable the divisor if one wants the same rate as parent */
+	if (rate == parent_rate) {
+		val = readl(asiu->div_base + clk->div.offset);
+		val &= ~(1 << clk->div.en_shift);
+		writel(val, asiu->div_base + clk->div.offset);
+		return 0;
+	}
+
+	div = DIV_ROUND_UP(parent_rate, rate);
+	if (div < 2)
+		return -EINVAL;
+
+	div_h = div_l = div >> 1;
+	div_h--;
+	div_l--;
+
+	val = readl(asiu->div_base + clk->div.offset);
+	val |= 1 << clk->div.en_shift;
+	if (div_h) {
+		val &= ~(bit_mask(clk->div.high_width)
+				<< clk->div.high_shift);
+		val |= div_h << clk->div.high_shift;
+	} else {
+		val &= ~(bit_mask(clk->div.high_width)
+				<< clk->div.high_shift);
+	}
+	if (div_l) {
+		val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
+		val |= div_l << clk->div.low_shift;
+	} else {
+		val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
+	}
+	writel(val, asiu->div_base + clk->div.offset);
+
+	return 0;
+}
+
+static const struct clk_ops iproc_asiu_ops = {
+	.enable = iproc_asiu_clk_enable,
+	.disable = iproc_asiu_clk_disable,
+	.recalc_rate = iproc_asiu_clk_recalc_rate,
+	.round_rate = iproc_asiu_clk_round_rate,
+	.set_rate = iproc_asiu_clk_set_rate,
+};
+
+void __init iproc_asiu_setup(struct device_node *node,
+		const struct iproc_asiu_div *div,
+		const struct iproc_asiu_gate *gate, unsigned int num_clks)
+{
+	int i, ret;
+	struct iproc_asiu *asiu;
+
+	if (WARN_ON(!gate || !div))
+		return;
+
+	asiu = kzalloc(sizeof(*asiu), GFP_KERNEL);
+	if (WARN_ON(!asiu))
+		return;
+
+	asiu->clk_data.clk_num = num_clks;
+	asiu->clk_data.clks = kcalloc(num_clks, sizeof(*asiu->clk_data.clks),
+			GFP_KERNEL);
+	if (WARN_ON(!asiu->clk_data.clks))
+		goto err_clks;
+
+	asiu->clks = kcalloc(num_clks, sizeof(*asiu->clks), GFP_KERNEL);
+	if (WARN_ON(!asiu->clks))
+		goto err_asiu_clks;
+
+	asiu->div_base = of_iomap(node, 0);
+	if (WARN_ON(!asiu->div_base))
+		goto err_iomap_div;
+
+	asiu->gate_base = of_iomap(node, 1);
+	if (WARN_ON(!asiu->gate_base))
+		goto err_iomap_gate;
+
+	for (i = 0; i < num_clks; i++) {
+		struct clk_init_data init;
+		struct clk *clk;
+		const char *parent_name;
+		struct iproc_asiu_clk *asiu_clk;
+		const char *clk_name;
+
+		clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
+		if (WARN_ON(!clk_name))
+			goto err_clk_register;
+
+		ret = of_property_read_string_index(node, "clock-output-names",
+				i, &clk_name);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+
+		asiu_clk = &asiu->clks[i];
+		asiu_clk->name = clk_name;
+		asiu_clk->asiu = asiu;
+		asiu_clk->div = div[i];
+		asiu_clk->gate = gate[i];
+		init.name = clk_name;
+		init.ops = &iproc_asiu_ops;
+		init.flags = 0;
+		parent_name = of_clk_get_parent_name(node, 0);
+		init.parent_names = (parent_name ? &parent_name : NULL);
+		init.num_parents = (parent_name ? 1 : 0);
+		asiu_clk->hw.init = &init;
+
+		clk = clk_register(NULL, &asiu_clk->hw);
+		if (WARN_ON(IS_ERR(clk)))
+			goto err_clk_register;
+		asiu->clk_data.clks[i] = clk;
+	}
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get,
+			&asiu->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_register;
+
+	return;
+
+err_clk_register:
+	for (i = 0; i < num_clks; i++)
+		kfree(asiu->clks[i].name);
+	iounmap(asiu->gate_base);
+
+err_iomap_gate:
+	iounmap(asiu->div_base);
+
+err_iomap_div:
+	kfree(asiu->clks);
+
+err_asiu_clks:
+	kfree(asiu->clk_data.clks);
+
+err_clks:
+	kfree(asiu);
+}
diff --git a/drivers/clk/bcm/clk-iproc-clk.c b/drivers/clk/bcm/clk-iproc-clk.c
new file mode 100644
index 0000000..be3c42c
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-clk.c
@@ -0,0 +1,238 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+struct iproc_pll;
+
+struct iproc_clk {
+	struct clk_hw hw;
+	const char *name;
+	struct iproc_pll *pll;
+	unsigned long rate;
+	const struct iproc_clk_ctrl *ctrl;
+};
+
+struct iproc_pll {
+	void __iomem *base;
+	struct clk_onecell_data clk_data;
+	struct iproc_clk *clks;
+};
+
+#define to_iproc_clk(hw) container_of(hw, struct iproc_clk, hw)
+
+static int iproc_clk_enable(struct clk_hw *hw)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+
+	/* channel enable is active low */
+	val = readl(pll->base + ctrl->enable.offset);
+	val &= ~(1 << ctrl->enable.enable_shift);
+	writel(val, pll->base + ctrl->enable.offset);
+
+	/* also make sure channel is not held */
+	val = readl(pll->base + ctrl->enable.offset);
+	val &= ~(1 << ctrl->enable.hold_shift);
+	writel(val, pll->base + ctrl->enable.offset);
+
+	return 0;
+}
+
+static void iproc_clk_disable(struct clk_hw *hw)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+
+	if (ctrl->flags & IPROC_CLK_AON)
+		return;
+
+	val = readl(pll->base + ctrl->enable.offset);
+	val |= 1 << ctrl->enable.enable_shift;
+	writel(val, pll->base + ctrl->enable.offset);
+}
+
+static unsigned long iproc_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+	unsigned int mdiv;
+
+	if (parent_rate == 0)
+		return 0;
+
+	val = readl(pll->base + ctrl->mdiv.offset);
+	mdiv = (val >> ctrl->mdiv.shift) & bit_mask(ctrl->mdiv.width);
+	if (mdiv == 0)
+		mdiv = 256;
+
+	clk->rate = parent_rate / mdiv;
+
+	return clk->rate;
+}
+
+static long iproc_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	unsigned int div;
+
+	if (rate == 0 || *parent_rate == 0)
+		return -EINVAL;
+
+	if (rate == *parent_rate)
+		return *parent_rate;
+
+	div = DIV_ROUND_UP(*parent_rate, rate);
+	if (div < 2)
+		return *parent_rate;
+
+	if (div > 256)
+		div = 256;
+
+	return *parent_rate / div;
+}
+
+static int iproc_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+	unsigned int div;
+
+	if (rate == 0 || parent_rate == 0)
+		return -EINVAL;
+
+	div = DIV_ROUND_UP(parent_rate, rate);
+	if (div > 256)
+		return -EINVAL;
+
+	val = readl(pll->base + ctrl->mdiv.offset);
+	if (div == 256) {
+		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
+	} else {
+		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
+		val |= div << ctrl->mdiv.shift;
+	}
+	writel(val, pll->base + ctrl->mdiv.offset);
+	clk->rate = parent_rate / div;
+
+	return 0;
+}
+
+static const struct clk_ops iproc_clk_ops = {
+	.enable = iproc_clk_enable,
+	.disable = iproc_clk_disable,
+	.recalc_rate = iproc_clk_recalc_rate,
+	.round_rate = iproc_clk_round_rate,
+	.set_rate = iproc_clk_set_rate,
+};
+
+void __init iproc_clk_setup(struct device_node *node,
+		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks)
+{
+	int i, ret;
+	struct iproc_pll *pll;
+
+	if (WARN_ON(!ctrl))
+		return;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->clk_data.clk_num = num_clks;
+	pll->clk_data.clks = kcalloc(num_clks, sizeof(*pll->clk_data.clks),
+			GFP_KERNEL);
+	if (WARN_ON(!pll->clk_data.clks))
+		goto err_clks;
+
+	pll->clks = kcalloc(num_clks, sizeof(*pll->clks), GFP_KERNEL);
+	if (WARN_ON(!pll->clks))
+		goto err_pll_clks;
+
+	pll->base = of_iomap(node, 0);
+	if (WARN_ON(!pll->base))
+		goto err_iomap;
+
+	for (i = 0; i < num_clks; i++) {
+		struct clk_init_data init;
+		struct clk *clk;
+		const char *parent_name;
+		struct iproc_clk *iclk;
+		const char *clk_name;
+
+		clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
+		if (WARN_ON(!clk_name))
+			goto err_clk_register;
+
+		ret = of_property_read_string_index(node, "clock-output-names",
+				i, &clk_name);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+
+		iclk = &pll->clks[i];
+		iclk->name = clk_name;
+		iclk->pll = pll;
+		iclk->ctrl = &ctrl[i];
+		init.name = clk_name;
+		init.ops = &iproc_clk_ops;
+		init.flags = 0;
+		parent_name = of_clk_get_parent_name(node, 0);
+		init.parent_names = (parent_name ? &parent_name : NULL);
+		init.num_parents = (parent_name ? 1 : 0);
+		iclk->hw.init = &init;
+
+		clk = clk_register(NULL, &iclk->hw);
+		if (WARN_ON(IS_ERR(clk)))
+			goto err_clk_register;
+		pll->clk_data.clks[i] = clk;
+	}
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_register;
+
+	return;
+
+err_clk_register:
+	for (i = 0; i < num_clks; i++)
+		kfree(pll->clks[i].name);
+	iounmap(pll->base);
+
+err_iomap:
+	kfree(pll->clks);
+
+err_pll_clks:
+	kfree(pll->clk_data.clks);
+
+err_clks:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc-pll.c b/drivers/clk/bcm/clk-iproc-pll.c
new file mode 100644
index 0000000..cd3bd38
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-pll.c
@@ -0,0 +1,483 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+#define PLL_VCO_HIGH_SHIFT 19
+#define PLL_VCO_LOW_SHIFT  30
+
+/* number of delay loops waiting for PLL to lock */
+#define LOCK_DELAY 100
+
+/* number of VCO frequency bands */
+#define NUM_FREQ_BANDS 8
+
+#define NUM_KP_BANDS 3
+enum kp_band {
+	KP_BAND_MID = 0,
+	KP_BAND_HIGH,
+	KP_BAND_HIGH_HIGH
+};
+
+static const unsigned int kp_table[NUM_KP_BANDS][NUM_FREQ_BANDS] = {
+	{ 5, 6, 6, 7, 7, 8, 9, 10 },
+	{ 4, 4, 5, 5, 6, 7, 8, 9  },
+	{ 4, 5, 5, 6, 7, 8, 9, 10 },
+};
+
+static const unsigned long ref_freq_table[NUM_FREQ_BANDS][2] = {
+	{ 10000000,  12500000  },
+	{ 12500000,  15000000  },
+	{ 15000000,  20000000  },
+	{ 20000000,  25000000  },
+	{ 25000000,  50000000  },
+	{ 50000000,  75000000  },
+	{ 75000000,  100000000 },
+	{ 100000000, 125000000 },
+};
+
+enum vco_freq_range {
+	VCO_LOW       = 700000000U,
+	VCO_MID       = 1200000000U,
+	VCO_HIGH      = 2200000000U,
+	VCO_HIGH_HIGH = 3100000000U,
+	VCO_MAX       = 4000000000U,
+};
+
+struct iproc_pll {
+	struct clk_hw hw;
+	void __iomem *pll_base;
+	void __iomem *pwr_base;
+	void __iomem *asiu_base;
+	struct clk_onecell_data clk_data;
+	const char *name;
+	const struct iproc_pll_ctrl *ctrl;
+	const struct iproc_pll_vco_freq_param *vco_param;
+	unsigned int num_vco_entries;
+	unsigned long rate;
+};
+
+#define to_iproc_pll(hw) container_of(hw, struct iproc_pll, hw)
+
+/*
+ * Get the clock rate based on name
+ */
+static unsigned long __get_rate(const char *clk_name)
+{
+	struct clk *clk;
+
+	clk = __clk_lookup(clk_name);
+	if (!clk) {
+		pr_err("%s: unable to find clock by name: %s\n", __func__,
+				clk_name);
+		return 0;
+	}
+
+	return clk_get_rate(clk);
+}
+
+/*
+ * Based on the target frequency, find a match from the VCO frequency parameter
+ * table and return its index
+ */
+static int pll_get_rate_index(struct iproc_pll *pll, unsigned int target_rate)
+{
+	int i;
+
+	for (i = 0; i < pll->num_vco_entries; i++)
+		if (target_rate == pll->vco_param[i].rate)
+			break;
+
+	if (i >= pll->num_vco_entries)
+		return -EINVAL;
+
+	return i;
+}
+
+static int get_kp(unsigned long ref_freq, enum kp_band kp_index)
+{
+	int i;
+
+	if (ref_freq < ref_freq_table[0][0])
+		return -EINVAL;
+
+	for (i = 0; i < NUM_FREQ_BANDS; i++) {
+		if (ref_freq >= ref_freq_table[i][0] &&
+			ref_freq < ref_freq_table[i][1])
+			return kp_table[kp_index][i];
+	}
+	return -EINVAL;
+}
+
+static int pll_wait_for_lock(struct iproc_pll *pll)
+{
+	int i;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+
+	for (i = 0; i < LOCK_DELAY; i++) {
+		u32 val = readl(pll->pll_base + ctrl->status.offset);
+
+		if (val & (1 << ctrl->status.shift))
+			return 0;
+		udelay(10);
+	}
+
+	return -EIO;
+}
+
+static void __pll_disable(struct iproc_pll *pll)
+{
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		val = readl(pll->asiu_base + ctrl->asiu.offset);
+		val &= ~(1 << ctrl->asiu.en_shift);
+		writel(val, pll->asiu_base + ctrl->asiu.offset);
+	}
+
+	/* latch input value so core power can be shut down */
+	val = readl(pll->pwr_base + ctrl->aon.offset);
+	val |= (1 << ctrl->aon.iso_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+
+	/* power down the core */
+	val &= ~(bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+}
+
+static int __pll_enable(struct iproc_pll *pll)
+{
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+
+	/* power up the PLL and make sure it's not latched */
+	val = readl(pll->pwr_base + ctrl->aon.offset);
+	val |= bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift;
+	val &= ~(1 << ctrl->aon.iso_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+
+	/* certain PLLs also need to be ungated from the ASIU top level */
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		val = readl(pll->asiu_base + ctrl->asiu.offset);
+		val |= (1 << ctrl->asiu.en_shift);
+		writel(val, pll->asiu_base + ctrl->asiu.offset);
+	}
+
+	return 0;
+}
+
+static void __pll_put_in_reset(struct iproc_pll *pll)
+{
+	u32 val;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
+
+	val = readl(pll->pll_base + reset->offset);
+	val &= ~(1 << reset->reset_shift | 1 << reset->p_reset_shift);
+	writel(val, pll->pll_base + reset->offset);
+}
+
+static void __pll_bring_out_reset(struct iproc_pll *pll, unsigned int kp,
+		unsigned int ka, unsigned int ki)
+{
+	u32 val;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
+
+	val = readl(pll->pll_base + reset->offset);
+	val &= ~(bit_mask(reset->ki_width) << reset->ki_shift |
+		bit_mask(reset->kp_width) << reset->kp_shift |
+		bit_mask(reset->ka_width) << reset->ka_shift);
+	val |=  ki << reset->ki_shift | kp << reset->kp_shift |
+		ka << reset->ka_shift;
+	val |= 1 << reset->reset_shift | 1 << reset->p_reset_shift;
+	writel(val, pll->pll_base + reset->offset);
+}
+
+static int pll_set_rate(struct iproc_pll *pll, unsigned int rate_index,
+		unsigned long parent_rate)
+{
+	const struct iproc_pll_vco_freq_param *vco =
+				&pll->vco_param[rate_index];
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	int ka = 0, ki, kp, ret;
+	unsigned long rate = vco->rate;
+	u32 val;
+	enum kp_band kp_index;
+	unsigned long ref_freq;
+
+	/*
+	 * reference frequency = parent frequency / PDIV
+	 * If PDIV = 0, then it becomes a multiplier (x2)
+	 */
+	if (vco->pdiv == 0)
+		ref_freq = parent_rate * 2;
+	else
+		ref_freq = parent_rate / vco->pdiv;
+
+	/* determine Ki and Kp index based on target VCO frequency */
+	if (rate >= VCO_LOW && rate < VCO_HIGH) {
+		ki = 4;
+		kp_index = KP_BAND_MID;
+	} else if (rate >= VCO_HIGH && rate && rate < VCO_HIGH_HIGH) {
+		ki = 3;
+		kp_index = KP_BAND_HIGH;
+	} else if (rate >= VCO_HIGH_HIGH && rate < VCO_MAX) {
+		ki = 3;
+		kp_index = KP_BAND_HIGH_HIGH;
+	} else {
+		pr_err("%s: pll: %s has invalid rate: %lu\n", __func__,
+				pll->name, rate);
+		return -EINVAL;
+	}
+
+	kp = get_kp(ref_freq, kp_index);
+	if (kp < 0) {
+		pr_err("%s: pll: %s has invalid kp\n", __func__, pll->name);
+		return kp;
+	}
+
+	ret = __pll_enable(pll);
+	if (ret) {
+		pr_err("%s: pll: %s fails to enable\n", __func__, pll->name);
+		return ret;
+	}
+
+	/* put PLL in reset */
+	__pll_put_in_reset(pll);
+
+	writel(0, pll->pll_base + ctrl->vco_ctrl.u_offset);
+	val = readl(pll->pll_base + ctrl->vco_ctrl.l_offset);
+
+	if (rate >= VCO_LOW && rate < VCO_MID)
+		val |= (1 << PLL_VCO_LOW_SHIFT);
+
+	if (rate < VCO_HIGH)
+		val &= ~(1 << PLL_VCO_HIGH_SHIFT);
+	else
+		val |= (1 << PLL_VCO_HIGH_SHIFT);
+
+	writel(val, pll->pll_base + ctrl->vco_ctrl.l_offset);
+
+	/* program integer part of NDIV */
+	val = readl(pll->pll_base + ctrl->ndiv_int.offset);
+	val &= ~(bit_mask(ctrl->ndiv_int.width) << ctrl->ndiv_int.shift);
+	val |= vco->ndiv_int << ctrl->ndiv_int.shift;
+	writel(val, pll->pll_base + ctrl->ndiv_int.offset);
+
+	/* program fractional part of NDIV */
+	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
+		val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
+		val &= ~(bit_mask(ctrl->ndiv_frac.width) <<
+				ctrl->ndiv_frac.shift);
+		val |= vco->ndiv_frac << ctrl->ndiv_frac.shift;
+		writel(val, pll->pll_base + ctrl->ndiv_frac.offset);
+	}
+
+	/* program PDIV */
+	val = readl(pll->pll_base + ctrl->pdiv.offset);
+	val &= ~(bit_mask(ctrl->pdiv.width) << ctrl->pdiv.shift);
+	val |= vco->pdiv << ctrl->pdiv.shift;
+	writel(val, pll->pll_base + ctrl->pdiv.offset);
+
+	__pll_bring_out_reset(pll, kp, ka, ki);
+
+	ret = pll_wait_for_lock(pll);
+	if (ret < 0) {
+		pr_err("%s: pll: %s failed to lock\n", __func__, pll->name);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int iproc_pll_enable(struct clk_hw *hw)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+
+	return __pll_enable(pll);
+}
+
+static void iproc_pll_disable(struct clk_hw *hw)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+
+	if (ctrl->flags & IPROC_CLK_AON)
+		return;
+
+	__pll_disable(pll);
+}
+
+static unsigned long iproc_pll_recalc_rate(struct clk_hw *hw,
+	unsigned long parent_rate)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+	u64 ndiv;
+	unsigned int ndiv_int, ndiv_frac, pdiv;
+
+	if (parent_rate == 0)
+		return 0;
+
+	/* PLL needs to be locked */
+	val = readl(pll->pll_base + ctrl->status.offset);
+	if ((val & (1 << ctrl->status.shift)) == 0) {
+		pll->rate = 0;
+		return 0;
+	}
+
+	/*
+	 * PLL output frequency =
+	 *
+	 * ((ndiv_int + ndiv_frac / 2^20) * (parent clock rate / pdiv)
+	 */
+	val = readl(pll->pll_base + ctrl->ndiv_int.offset);
+	ndiv_int = (val >> ctrl->ndiv_int.shift) &
+		bit_mask(ctrl->ndiv_int.width);
+	ndiv = ndiv_int << ctrl->ndiv_int.shift;
+
+	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
+		val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
+		ndiv_frac = (val >> ctrl->ndiv_frac.shift) &
+			bit_mask(ctrl->ndiv_frac.width);
+
+		if (ndiv_frac != 0)
+			ndiv = (ndiv_int << ctrl->ndiv_int.shift) | ndiv_frac;
+	}
+
+	val = readl(pll->pll_base + ctrl->pdiv.offset);
+	pdiv = (val >> ctrl->pdiv.shift) & bit_mask(ctrl->pdiv.width);
+
+	pll->rate = (ndiv * parent_rate) >> ctrl->ndiv_int.shift;
+
+	if (pdiv == 0)
+		pll->rate *= 2;
+	else
+		pll->rate /= pdiv;
+
+	return pll->rate;
+}
+
+static const struct clk_ops iproc_pll_ops = {
+	.enable = iproc_pll_enable,
+	.disable = iproc_pll_disable,
+	.recalc_rate = iproc_pll_recalc_rate,
+};
+
+void __init iproc_pll_setup(struct device_node *node,
+		const struct iproc_pll_ctrl *ctrl,
+		const struct iproc_pll_vco_freq_param *vco_param,
+		unsigned int num_vco_entries)
+{
+	int ret;
+	struct clk *clk;
+	struct iproc_pll *pll;
+	struct clk_init_data init;
+	const char *parent_name;
+	unsigned int rate;
+
+	if (WARN_ON(!ctrl))
+		return;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->pll_base = of_iomap(node, 0);
+	if (WARN_ON(!pll->pll_base))
+		goto err_pll_iomap;
+
+	pll->pwr_base = of_iomap(node, 1);
+	if (WARN_ON(!pll->pwr_base))
+		goto err_pwr_iomap;
+
+	/* some PLLs require gating control at the top ASIU level */
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		pll->asiu_base = of_iomap(node, 2);
+		if (WARN_ON(!pll->asiu_base))
+			goto err_asiu_iomap;
+	}
+
+	pll->ctrl = ctrl;
+	pll->name = node->name;
+	init.name = node->name;
+	init.ops = &iproc_pll_ops;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	pll->hw.init = &init;
+
+	/* configure the PLL to the desired VCO frequency if specified */
+	ret = of_property_read_u32(node, "clock-frequency", &rate);
+	if (!ret) {
+		unsigned long parent_rate;
+		int rate_index;
+
+		if (WARN_ON(!vco_param))
+			goto err_clk_register;
+
+		pll->num_vco_entries = num_vco_entries;
+		pll->vco_param = vco_param;
+
+		parent_rate = __get_rate(parent_name);
+		if (WARN_ON(!parent_rate))
+			goto err_clk_register;
+
+		rate_index = pll_get_rate_index(pll, rate);
+		if (WARN_ON(rate_index < 0))
+			goto err_clk_register;
+
+		ret = pll_set_rate(pll, rate_index, parent_rate);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+	}
+
+	clk = clk_register(NULL, &pll->hw);
+	if (WARN_ON(IS_ERR(clk)))
+		goto err_clk_register;
+
+	pll->clk_data.clk_num = 1;
+	pll->clk_data.clks = &clk;
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get,
+			&pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_add;
+
+	return;
+
+err_clk_add:
+	clk_unregister(clk);
+err_clk_register:
+	if (pll->asiu_base)
+		iounmap(pll->asiu_base);
+err_asiu_iomap:
+	iounmap(pll->pwr_base);
+err_pwr_iomap:
+	iounmap(pll->pll_base);
+err_pll_iomap:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc.h b/drivers/clk/bcm/clk-iproc.h
new file mode 100644
index 0000000..4aa0479
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc.h
@@ -0,0 +1,155 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _CLK_IPROC_H
+#define _CLK_IPROC_H
+
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/of.h>
+#include <linux/clk-provider.h>
+
+#define IPROC_CLK_NAME_LEN 25
+#define IPROC_CLK_INVALID_OFFSET 0xffffffff
+#define bit_mask(width) ((1 << (width)) - 1)
+
+/* clock should not be disabled at runtime */
+#define IPROC_CLK_AON BIT(0)
+
+/* PLL requires gating through ASIU */
+#define IPROC_CLK_PLL_ASIU BIT(1)
+
+/* PLL has fractional part of the NDIV */
+#define IPROC_CLK_PLL_HAS_NDIV_FRAC BIT(2)
+
+/*
+ * Parameters for VCO frequency configuration
+ *
+ * VCO frequency =
+ * ((ndiv_int + ndiv_frac / 2^20) * (ref freqeuncy  / pdiv)
+ */
+struct iproc_pll_vco_freq_param {
+	unsigned long rate;
+	unsigned int ndiv_int;
+	unsigned int ndiv_frac;
+	unsigned int pdiv;
+};
+
+struct iproc_clk_reg_op {
+	unsigned int offset;
+	unsigned int shift;
+	unsigned int width;
+};
+
+/*
+ * Clock gating control at the top ASIU level
+ */
+struct iproc_asiu_gate {
+	unsigned int offset;
+	unsigned int en_shift;
+};
+
+/*
+ * Control of powering on/off of a PLL
+ *
+ * Before powering off a PLL, input isolation (ISO) needs to be enabled
+ */
+struct iproc_pll_aon_pwr_ctrl {
+	unsigned int offset;
+	unsigned int pwr_width;
+	unsigned int pwr_shift;
+	unsigned int iso_shift;
+};
+
+/*
+ * Control of the PLL reset, with Ki, Kp, and Ka parameters
+ */
+struct iproc_pll_reset_ctrl {
+	unsigned int offset;
+	unsigned int reset_shift;
+	unsigned int p_reset_shift;
+	unsigned int ki_shift;
+	unsigned int ki_width;
+	unsigned int kp_shift;
+	unsigned int kp_width;
+	unsigned int ka_shift;
+	unsigned int ka_width;
+};
+
+struct iproc_pll_vco_ctrl {
+	unsigned int u_offset;
+	unsigned int l_offset;
+};
+
+/*
+ * Main PLL control parameters
+ */
+struct iproc_pll_ctrl {
+	unsigned long flags;
+	struct iproc_pll_aon_pwr_ctrl aon;
+	struct iproc_asiu_gate asiu;
+	struct iproc_pll_reset_ctrl reset;
+	struct iproc_clk_reg_op ndiv_int;
+	struct iproc_clk_reg_op ndiv_frac;
+	struct iproc_clk_reg_op pdiv;
+	struct iproc_pll_vco_ctrl vco_ctrl;
+	struct iproc_clk_reg_op status;
+};
+
+/*
+ * Controls enabling/disabling a PLL derived clock
+ */
+struct iproc_clk_enable_ctrl {
+	unsigned int offset;
+	unsigned int enable_shift;
+	unsigned int hold_shift;
+	unsigned int bypass_shift;
+};
+
+/*
+ * Main clock control parameters for clocks derived from the PLLs
+ */
+struct iproc_clk_ctrl {
+	unsigned int channel;
+	unsigned long flags;
+	struct iproc_clk_enable_ctrl enable;
+	struct iproc_clk_reg_op mdiv;
+};
+
+/*
+ * Divisor of the ASIU clocks
+ */
+struct iproc_asiu_div {
+	unsigned int offset;
+	unsigned int en_shift;
+	unsigned int high_shift;
+	unsigned int high_width;
+	unsigned int low_shift;
+	unsigned int low_width;
+};
+
+extern void __init iproc_armpll_setup(struct device_node *node);
+extern void __init iproc_pll_setup(struct device_node *node,
+		const struct iproc_pll_ctrl *ctrl,
+		const struct iproc_pll_vco_freq_param *vco_param,
+		unsigned int num_freqs);
+extern void __init iproc_clk_setup(struct device_node *node,
+		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks);
+extern void __init iproc_asiu_setup(struct device_node *node,
+		const struct iproc_asiu_div *div,
+		const struct iproc_asiu_gate *gate, unsigned int num_clks);
+
+#endif /* _CLK_IPROC_H */
-- 
1.7.9.5

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[PATCH v3 2/5] clk: iproc: add initial common clock support

[Ray Jui]

This adds basic and generic support for various iProc PLLs and clocks
including the ARMPLL, GENPLL, LCPLL, MIPIPLL, and ASIU clocks.

SoCs under the iProc architecture can define their specific register
offsets and clock parameters for their PLL and clock controllers. These
parameters can be passed as arugments into the generic iProc PLL and
clock setup functions

Derived from code originally provided by Jonathan Richardson
<jonathar@broadcom.com>

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/clk/bcm/Kconfig            |    9 +
 drivers/clk/bcm/Makefile           |    1 +
 drivers/clk/bcm/clk-iproc-armpll.c |  286 +++++++++++++++++++++
 drivers/clk/bcm/clk-iproc-asiu.c   |  275 ++++++++++++++++++++
 drivers/clk/bcm/clk-iproc-clk.c    |  238 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-pll.c    |  483 ++++++++++++++++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc.h        |  155 ++++++++++++
 7 files changed, 1447 insertions(+)
 create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
 create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
 create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
 create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
 create mode 100644 drivers/clk/bcm/clk-iproc.h

diff --git a/drivers/clk/bcm/Kconfig b/drivers/clk/bcm/Kconfig
index 75506e5..66b5b7f 100644
--- a/drivers/clk/bcm/Kconfig
+++ b/drivers/clk/bcm/Kconfig
@@ -7,3 +7,12 @@ config CLK_BCM_KONA
 	  Enable common clock framework support for Broadcom SoCs
 	  using "Kona" style clock control units, including those
 	  in the BCM281xx and BCM21664 families.
+
+config COMMON_CLK_IPROC
+	bool "Broadcom iProc clock support"
+	depends on ARCH_BCM_IPROC
+	depends on COMMON_CLK
+	default y
+	help
+	  Enable common clock framework support for Broadcom SoCs
+	  based on the "iProc" architecture
diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
index 6297d05..6926636 100644
--- a/drivers/clk/bcm/Makefile
+++ b/drivers/clk/bcm/Makefile
@@ -2,3 +2,4 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
+obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
diff --git a/drivers/clk/bcm/clk-iproc-armpll.c b/drivers/clk/bcm/clk-iproc-armpll.c
new file mode 100644
index 0000000..ec9b130
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-armpll.c
@@ -0,0 +1,286 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+
+#define IPROC_CLK_MAX_FREQ_POLICY                    0x3
+#define IPROC_CLK_POLICY_FREQ_OFFSET                 0x008
+#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT      8
+#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK       0x7
+
+#define IPROC_CLK_PLLARMA_OFFSET                     0xc00
+#define IPROC_CLK_PLLARMA_LOCK_SHIFT                 28
+#define IPROC_CLK_PLLARMA_PDIV_SHIFT                 24
+#define IPROC_CLK_PLLARMA_PDIV_MASK                  0xf
+#define IPROC_CLK_PLLARMA_NDIV_INT_SHIFT             8
+#define IPROC_CLK_PLLARMA_NDIV_INT_MASK              0x3ff
+
+#define IPROC_CLK_PLLARMB_OFFSET                     0xc04
+#define IPROC_CLK_PLLARMB_NDIV_FRAC_MASK             0xfffff
+
+#define IPROC_CLK_PLLARMC_OFFSET                     0xc08
+#define IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT            8
+#define IPROC_CLK_PLLARMC_MDIV_MASK                  0xff
+
+#define IPROC_CLK_PLLARMCTL5_OFFSET                  0xc20
+#define IPROC_CLK_PLLARMCTL5_H_MDIV_MASK             0xff
+
+#define IPROC_CLK_PLLARM_OFFSET_OFFSET               0xc24
+#define IPROC_CLK_PLLARM_SW_CTL_SHIFT                29
+#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT       20
+#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK        0xff
+#define IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK       0xfffff
+
+#define IPROC_CLK_ARM_DIV_OFFSET                     0xe00
+#define IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT  4
+#define IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK        0xf
+
+#define IPROC_CLK_POLICY_DBG_OFFSET                  0xec0
+#define IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT          12
+#define IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK           0x7
+
+enum iproc_arm_pll_fid {
+	ARM_PLL_FID_CRYSTAL_CLK   = 0,
+	ARM_PLL_FID_SYS_CLK       = 2,
+	ARM_PLL_FID_CH0_SLOW_CLK  = 6,
+	ARM_PLL_FID_CH1_FAST_CLK  = 7
+};
+
+struct iproc_arm_pll {
+	struct clk_hw hw;
+	void __iomem *base;
+	struct clk_onecell_data clk_data;
+	unsigned long rate;
+};
+
+#define to_iproc_arm_pll(hw) container_of(hw, struct iproc_arm_pll, hw)
+
+static unsigned int __get_fid(struct iproc_arm_pll *pll)
+{
+	u32 val;
+	unsigned int policy, fid, active_fid;
+
+	val = readl(pll->base + IPROC_CLK_ARM_DIV_OFFSET);
+	if (val & (1 << IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT))
+		policy = val & IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK;
+	else
+		policy = 0;
+
+	/* something is seriously wrong */
+	BUG_ON(policy > IPROC_CLK_MAX_FREQ_POLICY);
+
+	val = readl(pll->base + IPROC_CLK_POLICY_FREQ_OFFSET);
+	fid = (val >> (IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT * policy)) &
+		IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK;
+
+	val = readl(pll->base + IPROC_CLK_POLICY_DBG_OFFSET);
+	active_fid = IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK &
+		(val >> IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT);
+	if (fid != active_fid) {
+		pr_debug("%s: fid override %u->%u\n", __func__,	fid,
+				active_fid);
+		fid = active_fid;
+	}
+
+	pr_debug("%s: active fid: %u\n", __func__, fid);
+
+	return fid;
+}
+
+/*
+ * Determine the mdiv (post divider) based on the frequency ID being used.
+ * There are 4 sources that can be used to derive the output clock rate:
+ *    - 25 MHz Crystal
+ *    - System clock
+ *    - PLL channel 0 (slow clock)
+ *    - PLL channel 1 (fast clock)
+ */
+static int __get_mdiv(struct iproc_arm_pll *pll)
+{
+	unsigned int fid;
+	int mdiv;
+	u32 val;
+
+	fid = __get_fid(pll);
+
+	switch (fid) {
+	case ARM_PLL_FID_CRYSTAL_CLK:
+	case ARM_PLL_FID_SYS_CLK:
+		mdiv = 1;
+		break;
+
+	case ARM_PLL_FID_CH0_SLOW_CLK:
+		val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
+		mdiv = val & IPROC_CLK_PLLARMC_MDIV_MASK;
+		if (mdiv == 0)
+			mdiv = 256;
+		break;
+
+	case ARM_PLL_FID_CH1_FAST_CLK:
+		val = readl(pll->base +	IPROC_CLK_PLLARMCTL5_OFFSET);
+		mdiv = val & IPROC_CLK_PLLARMCTL5_H_MDIV_MASK;
+		if (mdiv == 0)
+			mdiv = 256;
+		break;
+
+	default:
+		mdiv = -EFAULT;
+	}
+
+	return mdiv;
+}
+
+static unsigned int __get_ndiv(struct iproc_arm_pll *pll)
+{
+	u32 val;
+	unsigned int ndiv_int, ndiv_frac, ndiv;
+
+	val = readl(pll->base + IPROC_CLK_PLLARM_OFFSET_OFFSET);
+	if (val & (1 << IPROC_CLK_PLLARM_SW_CTL_SHIFT)) {
+		/*
+		 * offset mode is active. Read the ndiv from the PLLARM OFFSET
+		 * register
+		 */
+		ndiv_int = (val >> IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT) &
+			IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK;
+		if (ndiv_int == 0)
+			ndiv_int = 256;
+
+		ndiv_frac = val & IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK;
+	} else {
+		/* offset mode not active */
+		val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
+		ndiv_int = (val >> IPROC_CLK_PLLARMA_NDIV_INT_SHIFT) &
+			IPROC_CLK_PLLARMA_NDIV_INT_MASK;
+		if (ndiv_int == 0)
+			ndiv_int = 1024;
+
+		val = readl(pll->base + IPROC_CLK_PLLARMB_OFFSET);
+		ndiv_frac = val & IPROC_CLK_PLLARMB_NDIV_FRAC_MASK;
+	}
+
+	ndiv = (ndiv_int << 20) | ndiv_frac;
+
+	return ndiv;
+}
+
+/*
+ * The output frequency of the ARM PLL is calculated based on the ARM PLL
+ * divider values:
+ *   pdiv = ARM PLL pre-divider
+ *   ndiv = ARM PLL multiplier
+ *   mdiv = ARM PLL post divider
+ *
+ * The frequency is calculated by:
+ *   ((ndiv * parent clock rate) / pdiv) / mdiv
+ */
+static unsigned long iproc_arm_pll_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_arm_pll *pll = to_iproc_arm_pll(hw);
+	u32 val;
+	int mdiv;
+	u64 ndiv;
+	unsigned int pdiv;
+
+	/* in bypass mode, use parent rate */
+	val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
+	if (val & (1 << IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT)) {
+		pll->rate = parent_rate;
+		return pll->rate;
+	}
+
+	/* PLL needs to be locked */
+	val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
+	if (!(val & (1 << IPROC_CLK_PLLARMA_LOCK_SHIFT))) {
+		pll->rate = 0;
+		return 0;
+	}
+
+	pdiv = (val >> IPROC_CLK_PLLARMA_PDIV_SHIFT) &
+		IPROC_CLK_PLLARMA_PDIV_MASK;
+	if (pdiv == 0)
+		pdiv = 16;
+
+	ndiv = __get_ndiv(pll);
+	mdiv = __get_mdiv(pll);
+	if (mdiv <= 0) {
+		pll->rate = 0;
+		return 0;
+	}
+	pll->rate = (ndiv * parent_rate) >> 20;
+	pll->rate = (pll->rate / pdiv) / mdiv;
+
+	pr_debug("%s: ARM PLL rate: %lu. parent rate: %lu\n", __func__,
+			pll->rate, parent_rate);
+	pr_debug("%s: ndiv_int: %u, pdiv: %u, mdiv: %d\n", __func__,
+			(unsigned int)(ndiv >> 20), pdiv, mdiv);
+
+	return pll->rate;
+}
+
+static const struct clk_ops iproc_arm_pll_ops = {
+	.recalc_rate = iproc_arm_pll_recalc_rate,
+};
+
+void __init iproc_armpll_setup(struct device_node *node)
+{
+	int ret;
+	struct clk *clk;
+	struct iproc_arm_pll *pll;
+	struct clk_init_data init;
+	const char *parent_name;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->base = of_iomap(node, 0);
+	if (WARN_ON(!pll->base))
+		goto err_free_pll;
+
+	init.name = node->name;
+	init.ops = &iproc_arm_pll_ops;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	pll->hw.init = &init;
+
+	clk = clk_register(NULL, &pll->hw);
+	if (WARN_ON(IS_ERR(clk)))
+		goto err_iounmap;
+
+	pll->clk_data.clk_num = 1;
+	pll->clk_data.clks = &clk;
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_unregister;
+
+	return;
+
+err_clk_unregister:
+	clk_unregister(clk);
+err_iounmap:
+	iounmap(pll->base);
+err_free_pll:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc-asiu.c b/drivers/clk/bcm/clk-iproc-asiu.c
new file mode 100644
index 0000000..ab86b8c
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-asiu.c
@@ -0,0 +1,275 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+struct iproc_asiu;
+
+struct iproc_asiu_clk {
+	struct clk_hw hw;
+	const char *name;
+	struct iproc_asiu *asiu;
+	unsigned long rate;
+	struct iproc_asiu_div div;
+	struct iproc_asiu_gate gate;
+};
+
+struct iproc_asiu {
+	void __iomem *div_base;
+	void __iomem *gate_base;
+
+	struct clk_onecell_data clk_data;
+	struct iproc_asiu_clk *clks;
+};
+
+#define to_asiu_clk(hw) container_of(hw, struct iproc_asiu_clk, hw)
+
+static int iproc_asiu_clk_enable(struct clk_hw *hw)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+
+	/* some clocks at the ASIU level are always enabled */
+	if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
+		return 0;
+
+	val = readl(asiu->gate_base + clk->gate.offset);
+	val |= (1 << clk->gate.en_shift);
+	writel(val, asiu->gate_base + clk->gate.offset);
+
+	return 0;
+}
+
+static void iproc_asiu_clk_disable(struct clk_hw *hw)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+
+	/* some clocks at the ASIU level are always enabled */
+	if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
+		return;
+
+	val = readl(asiu->gate_base + clk->gate.offset);
+	val &= ~(1 << clk->gate.en_shift);
+	writel(val, asiu->gate_base + clk->gate.offset);
+}
+
+static unsigned long iproc_asiu_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+	unsigned int div_h, div_l;
+
+	if (parent_rate == 0) {
+		clk->rate = 0;
+		return 0;
+	}
+
+	/* if clock divisor is not enabled, simply return parent rate */
+	val = readl(asiu->div_base + clk->div.offset);
+	if ((val & (1 << clk->div.en_shift)) == 0) {
+		clk->rate = parent_rate;
+		return parent_rate;
+	}
+
+	/* clock rate = parent rate / (high_div + 1) + (low_div + 1) */
+	div_h = (val >> clk->div.high_shift) & bit_mask(clk->div.high_width);
+	div_h++;
+	div_l = (val >> clk->div.low_shift) & bit_mask(clk->div.low_width);
+	div_l++;
+
+	clk->rate = parent_rate / (div_h + div_l);
+	pr_debug("%s: rate: %lu. parent rate: %lu div_h: %u div_l: %u\n",
+		__func__, clk->rate, parent_rate, div_h, div_l);
+
+	return clk->rate;
+}
+
+static long iproc_asiu_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	unsigned int div;
+
+	if (rate == 0 || *parent_rate == 0)
+		return -EINVAL;
+
+	if (rate == *parent_rate)
+		return *parent_rate;
+
+	div = DIV_ROUND_UP(*parent_rate, rate);
+	if (div < 2)
+		return *parent_rate;
+
+	return *parent_rate / div;
+}
+
+static int iproc_asiu_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	unsigned int div, div_h, div_l;
+	u32 val;
+
+	if (rate == 0 || parent_rate == 0)
+		return -EINVAL;
+
+	/* simply disable the divisor if one wants the same rate as parent */
+	if (rate == parent_rate) {
+		val = readl(asiu->div_base + clk->div.offset);
+		val &= ~(1 << clk->div.en_shift);
+		writel(val, asiu->div_base + clk->div.offset);
+		return 0;
+	}
+
+	div = DIV_ROUND_UP(parent_rate, rate);
+	if (div < 2)
+		return -EINVAL;
+
+	div_h = div_l = div >> 1;
+	div_h--;
+	div_l--;
+
+	val = readl(asiu->div_base + clk->div.offset);
+	val |= 1 << clk->div.en_shift;
+	if (div_h) {
+		val &= ~(bit_mask(clk->div.high_width)
+				<< clk->div.high_shift);
+		val |= div_h << clk->div.high_shift;
+	} else {
+		val &= ~(bit_mask(clk->div.high_width)
+				<< clk->div.high_shift);
+	}
+	if (div_l) {
+		val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
+		val |= div_l << clk->div.low_shift;
+	} else {
+		val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
+	}
+	writel(val, asiu->div_base + clk->div.offset);
+
+	return 0;
+}
+
+static const struct clk_ops iproc_asiu_ops = {
+	.enable = iproc_asiu_clk_enable,
+	.disable = iproc_asiu_clk_disable,
+	.recalc_rate = iproc_asiu_clk_recalc_rate,
+	.round_rate = iproc_asiu_clk_round_rate,
+	.set_rate = iproc_asiu_clk_set_rate,
+};
+
+void __init iproc_asiu_setup(struct device_node *node,
+		const struct iproc_asiu_div *div,
+		const struct iproc_asiu_gate *gate, unsigned int num_clks)
+{
+	int i, ret;
+	struct iproc_asiu *asiu;
+
+	if (WARN_ON(!gate || !div))
+		return;
+
+	asiu = kzalloc(sizeof(*asiu), GFP_KERNEL);
+	if (WARN_ON(!asiu))
+		return;
+
+	asiu->clk_data.clk_num = num_clks;
+	asiu->clk_data.clks = kcalloc(num_clks, sizeof(*asiu->clk_data.clks),
+			GFP_KERNEL);
+	if (WARN_ON(!asiu->clk_data.clks))
+		goto err_clks;
+
+	asiu->clks = kcalloc(num_clks, sizeof(*asiu->clks), GFP_KERNEL);
+	if (WARN_ON(!asiu->clks))
+		goto err_asiu_clks;
+
+	asiu->div_base = of_iomap(node, 0);
+	if (WARN_ON(!asiu->div_base))
+		goto err_iomap_div;
+
+	asiu->gate_base = of_iomap(node, 1);
+	if (WARN_ON(!asiu->gate_base))
+		goto err_iomap_gate;
+
+	for (i = 0; i < num_clks; i++) {
+		struct clk_init_data init;
+		struct clk *clk;
+		const char *parent_name;
+		struct iproc_asiu_clk *asiu_clk;
+		const char *clk_name;
+
+		clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
+		if (WARN_ON(!clk_name))
+			goto err_clk_register;
+
+		ret = of_property_read_string_index(node, "clock-output-names",
+				i, &clk_name);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+
+		asiu_clk = &asiu->clks[i];
+		asiu_clk->name = clk_name;
+		asiu_clk->asiu = asiu;
+		asiu_clk->div = div[i];
+		asiu_clk->gate = gate[i];
+		init.name = clk_name;
+		init.ops = &iproc_asiu_ops;
+		init.flags = 0;
+		parent_name = of_clk_get_parent_name(node, 0);
+		init.parent_names = (parent_name ? &parent_name : NULL);
+		init.num_parents = (parent_name ? 1 : 0);
+		asiu_clk->hw.init = &init;
+
+		clk = clk_register(NULL, &asiu_clk->hw);
+		if (WARN_ON(IS_ERR(clk)))
+			goto err_clk_register;
+		asiu->clk_data.clks[i] = clk;
+	}
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get,
+			&asiu->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_register;
+
+	return;
+
+err_clk_register:
+	for (i = 0; i < num_clks; i++)
+		kfree(asiu->clks[i].name);
+	iounmap(asiu->gate_base);
+
+err_iomap_gate:
+	iounmap(asiu->div_base);
+
+err_iomap_div:
+	kfree(asiu->clks);
+
+err_asiu_clks:
+	kfree(asiu->clk_data.clks);
+
+err_clks:
+	kfree(asiu);
+}
diff --git a/drivers/clk/bcm/clk-iproc-clk.c b/drivers/clk/bcm/clk-iproc-clk.c
new file mode 100644
index 0000000..be3c42c
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-clk.c
@@ -0,0 +1,238 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+struct iproc_pll;
+
+struct iproc_clk {
+	struct clk_hw hw;
+	const char *name;
+	struct iproc_pll *pll;
+	unsigned long rate;
+	const struct iproc_clk_ctrl *ctrl;
+};
+
+struct iproc_pll {
+	void __iomem *base;
+	struct clk_onecell_data clk_data;
+	struct iproc_clk *clks;
+};
+
+#define to_iproc_clk(hw) container_of(hw, struct iproc_clk, hw)
+
+static int iproc_clk_enable(struct clk_hw *hw)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+
+	/* channel enable is active low */
+	val = readl(pll->base + ctrl->enable.offset);
+	val &= ~(1 << ctrl->enable.enable_shift);
+	writel(val, pll->base + ctrl->enable.offset);
+
+	/* also make sure channel is not held */
+	val = readl(pll->base + ctrl->enable.offset);
+	val &= ~(1 << ctrl->enable.hold_shift);
+	writel(val, pll->base + ctrl->enable.offset);
+
+	return 0;
+}
+
+static void iproc_clk_disable(struct clk_hw *hw)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+
+	if (ctrl->flags & IPROC_CLK_AON)
+		return;
+
+	val = readl(pll->base + ctrl->enable.offset);
+	val |= 1 << ctrl->enable.enable_shift;
+	writel(val, pll->base + ctrl->enable.offset);
+}
+
+static unsigned long iproc_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+	unsigned int mdiv;
+
+	if (parent_rate == 0)
+		return 0;
+
+	val = readl(pll->base + ctrl->mdiv.offset);
+	mdiv = (val >> ctrl->mdiv.shift) & bit_mask(ctrl->mdiv.width);
+	if (mdiv == 0)
+		mdiv = 256;
+
+	clk->rate = parent_rate / mdiv;
+
+	return clk->rate;
+}
+
+static long iproc_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	unsigned int div;
+
+	if (rate == 0 || *parent_rate == 0)
+		return -EINVAL;
+
+	if (rate == *parent_rate)
+		return *parent_rate;
+
+	div = DIV_ROUND_UP(*parent_rate, rate);
+	if (div < 2)
+		return *parent_rate;
+
+	if (div > 256)
+		div = 256;
+
+	return *parent_rate / div;
+}
+
+static int iproc_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+	unsigned int div;
+
+	if (rate == 0 || parent_rate == 0)
+		return -EINVAL;
+
+	div = DIV_ROUND_UP(parent_rate, rate);
+	if (div > 256)
+		return -EINVAL;
+
+	val = readl(pll->base + ctrl->mdiv.offset);
+	if (div == 256) {
+		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
+	} else {
+		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
+		val |= div << ctrl->mdiv.shift;
+	}
+	writel(val, pll->base + ctrl->mdiv.offset);
+	clk->rate = parent_rate / div;
+
+	return 0;
+}
+
+static const struct clk_ops iproc_clk_ops = {
+	.enable = iproc_clk_enable,
+	.disable = iproc_clk_disable,
+	.recalc_rate = iproc_clk_recalc_rate,
+	.round_rate = iproc_clk_round_rate,
+	.set_rate = iproc_clk_set_rate,
+};
+
+void __init iproc_clk_setup(struct device_node *node,
+		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks)
+{
+	int i, ret;
+	struct iproc_pll *pll;
+
+	if (WARN_ON(!ctrl))
+		return;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->clk_data.clk_num = num_clks;
+	pll->clk_data.clks = kcalloc(num_clks, sizeof(*pll->clk_data.clks),
+			GFP_KERNEL);
+	if (WARN_ON(!pll->clk_data.clks))
+		goto err_clks;
+
+	pll->clks = kcalloc(num_clks, sizeof(*pll->clks), GFP_KERNEL);
+	if (WARN_ON(!pll->clks))
+		goto err_pll_clks;
+
+	pll->base = of_iomap(node, 0);
+	if (WARN_ON(!pll->base))
+		goto err_iomap;
+
+	for (i = 0; i < num_clks; i++) {
+		struct clk_init_data init;
+		struct clk *clk;
+		const char *parent_name;
+		struct iproc_clk *iclk;
+		const char *clk_name;
+
+		clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
+		if (WARN_ON(!clk_name))
+			goto err_clk_register;
+
+		ret = of_property_read_string_index(node, "clock-output-names",
+				i, &clk_name);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+
+		iclk = &pll->clks[i];
+		iclk->name = clk_name;
+		iclk->pll = pll;
+		iclk->ctrl = &ctrl[i];
+		init.name = clk_name;
+		init.ops = &iproc_clk_ops;
+		init.flags = 0;
+		parent_name = of_clk_get_parent_name(node, 0);
+		init.parent_names = (parent_name ? &parent_name : NULL);
+		init.num_parents = (parent_name ? 1 : 0);
+		iclk->hw.init = &init;
+
+		clk = clk_register(NULL, &iclk->hw);
+		if (WARN_ON(IS_ERR(clk)))
+			goto err_clk_register;
+		pll->clk_data.clks[i] = clk;
+	}
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_register;
+
+	return;
+
+err_clk_register:
+	for (i = 0; i < num_clks; i++)
+		kfree(pll->clks[i].name);
+	iounmap(pll->base);
+
+err_iomap:
+	kfree(pll->clks);
+
+err_pll_clks:
+	kfree(pll->clk_data.clks);
+
+err_clks:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc-pll.c b/drivers/clk/bcm/clk-iproc-pll.c
new file mode 100644
index 0000000..cd3bd38
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-pll.c
@@ -0,0 +1,483 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+#define PLL_VCO_HIGH_SHIFT 19
+#define PLL_VCO_LOW_SHIFT  30
+
+/* number of delay loops waiting for PLL to lock */
+#define LOCK_DELAY 100
+
+/* number of VCO frequency bands */
+#define NUM_FREQ_BANDS 8
+
+#define NUM_KP_BANDS 3
+enum kp_band {
+	KP_BAND_MID = 0,
+	KP_BAND_HIGH,
+	KP_BAND_HIGH_HIGH
+};
+
+static const unsigned int kp_table[NUM_KP_BANDS][NUM_FREQ_BANDS] = {
+	{ 5, 6, 6, 7, 7, 8, 9, 10 },
+	{ 4, 4, 5, 5, 6, 7, 8, 9  },
+	{ 4, 5, 5, 6, 7, 8, 9, 10 },
+};
+
+static const unsigned long ref_freq_table[NUM_FREQ_BANDS][2] = {
+	{ 10000000,  12500000  },
+	{ 12500000,  15000000  },
+	{ 15000000,  20000000  },
+	{ 20000000,  25000000  },
+	{ 25000000,  50000000  },
+	{ 50000000,  75000000  },
+	{ 75000000,  100000000 },
+	{ 100000000, 125000000 },
+};
+
+enum vco_freq_range {
+	VCO_LOW       = 700000000U,
+	VCO_MID       = 1200000000U,
+	VCO_HIGH      = 2200000000U,
+	VCO_HIGH_HIGH = 3100000000U,
+	VCO_MAX       = 4000000000U,
+};
+
+struct iproc_pll {
+	struct clk_hw hw;
+	void __iomem *pll_base;
+	void __iomem *pwr_base;
+	void __iomem *asiu_base;
+	struct clk_onecell_data clk_data;
+	const char *name;
+	const struct iproc_pll_ctrl *ctrl;
+	const struct iproc_pll_vco_freq_param *vco_param;
+	unsigned int num_vco_entries;
+	unsigned long rate;
+};
+
+#define to_iproc_pll(hw) container_of(hw, struct iproc_pll, hw)
+
+/*
+ * Get the clock rate based on name
+ */
+static unsigned long __get_rate(const char *clk_name)
+{
+	struct clk *clk;
+
+	clk = __clk_lookup(clk_name);
+	if (!clk) {
+		pr_err("%s: unable to find clock by name: %s\n", __func__,
+				clk_name);
+		return 0;
+	}
+
+	return clk_get_rate(clk);
+}
+
+/*
+ * Based on the target frequency, find a match from the VCO frequency parameter
+ * table and return its index
+ */
+static int pll_get_rate_index(struct iproc_pll *pll, unsigned int target_rate)
+{
+	int i;
+
+	for (i = 0; i < pll->num_vco_entries; i++)
+		if (target_rate == pll->vco_param[i].rate)
+			break;
+
+	if (i >= pll->num_vco_entries)
+		return -EINVAL;
+
+	return i;
+}
+
+static int get_kp(unsigned long ref_freq, enum kp_band kp_index)
+{
+	int i;
+
+	if (ref_freq < ref_freq_table[0][0])
+		return -EINVAL;
+
+	for (i = 0; i < NUM_FREQ_BANDS; i++) {
+		if (ref_freq >= ref_freq_table[i][0] &&
+			ref_freq < ref_freq_table[i][1])
+			return kp_table[kp_index][i];
+	}
+	return -EINVAL;
+}
+
+static int pll_wait_for_lock(struct iproc_pll *pll)
+{
+	int i;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+
+	for (i = 0; i < LOCK_DELAY; i++) {
+		u32 val = readl(pll->pll_base + ctrl->status.offset);
+
+		if (val & (1 << ctrl->status.shift))
+			return 0;
+		udelay(10);
+	}
+
+	return -EIO;
+}
+
+static void __pll_disable(struct iproc_pll *pll)
+{
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		val = readl(pll->asiu_base + ctrl->asiu.offset);
+		val &= ~(1 << ctrl->asiu.en_shift);
+		writel(val, pll->asiu_base + ctrl->asiu.offset);
+	}
+
+	/* latch input value so core power can be shut down */
+	val = readl(pll->pwr_base + ctrl->aon.offset);
+	val |= (1 << ctrl->aon.iso_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+
+	/* power down the core */
+	val &= ~(bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+}
+
+static int __pll_enable(struct iproc_pll *pll)
+{
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+
+	/* power up the PLL and make sure it's not latched */
+	val = readl(pll->pwr_base + ctrl->aon.offset);
+	val |= bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift;
+	val &= ~(1 << ctrl->aon.iso_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+
+	/* certain PLLs also need to be ungated from the ASIU top level */
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		val = readl(pll->asiu_base + ctrl->asiu.offset);
+		val |= (1 << ctrl->asiu.en_shift);
+		writel(val, pll->asiu_base + ctrl->asiu.offset);
+	}
+
+	return 0;
+}
+
+static void __pll_put_in_reset(struct iproc_pll *pll)
+{
+	u32 val;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
+
+	val = readl(pll->pll_base + reset->offset);
+	val &= ~(1 << reset->reset_shift | 1 << reset->p_reset_shift);
+	writel(val, pll->pll_base + reset->offset);
+}
+
+static void __pll_bring_out_reset(struct iproc_pll *pll, unsigned int kp,
+		unsigned int ka, unsigned int ki)
+{
+	u32 val;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
+
+	val = readl(pll->pll_base + reset->offset);
+	val &= ~(bit_mask(reset->ki_width) << reset->ki_shift |
+		bit_mask(reset->kp_width) << reset->kp_shift |
+		bit_mask(reset->ka_width) << reset->ka_shift);
+	val |=  ki << reset->ki_shift | kp << reset->kp_shift |
+		ka << reset->ka_shift;
+	val |= 1 << reset->reset_shift | 1 << reset->p_reset_shift;
+	writel(val, pll->pll_base + reset->offset);
+}
+
+static int pll_set_rate(struct iproc_pll *pll, unsigned int rate_index,
+		unsigned long parent_rate)
+{
+	const struct iproc_pll_vco_freq_param *vco =
+				&pll->vco_param[rate_index];
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	int ka = 0, ki, kp, ret;
+	unsigned long rate = vco->rate;
+	u32 val;
+	enum kp_band kp_index;
+	unsigned long ref_freq;
+
+	/*
+	 * reference frequency = parent frequency / PDIV
+	 * If PDIV = 0, then it becomes a multiplier (x2)
+	 */
+	if (vco->pdiv == 0)
+		ref_freq = parent_rate * 2;
+	else
+		ref_freq = parent_rate / vco->pdiv;
+
+	/* determine Ki and Kp index based on target VCO frequency */
+	if (rate >= VCO_LOW && rate < VCO_HIGH) {
+		ki = 4;
+		kp_index = KP_BAND_MID;
+	} else if (rate >= VCO_HIGH && rate && rate < VCO_HIGH_HIGH) {
+		ki = 3;
+		kp_index = KP_BAND_HIGH;
+	} else if (rate >= VCO_HIGH_HIGH && rate < VCO_MAX) {
+		ki = 3;
+		kp_index = KP_BAND_HIGH_HIGH;
+	} else {
+		pr_err("%s: pll: %s has invalid rate: %lu\n", __func__,
+				pll->name, rate);
+		return -EINVAL;
+	}
+
+	kp = get_kp(ref_freq, kp_index);
+	if (kp < 0) {
+		pr_err("%s: pll: %s has invalid kp\n", __func__, pll->name);
+		return kp;
+	}
+
+	ret = __pll_enable(pll);
+	if (ret) {
+		pr_err("%s: pll: %s fails to enable\n", __func__, pll->name);
+		return ret;
+	}
+
+	/* put PLL in reset */
+	__pll_put_in_reset(pll);
+
+	writel(0, pll->pll_base + ctrl->vco_ctrl.u_offset);
+	val = readl(pll->pll_base + ctrl->vco_ctrl.l_offset);
+
+	if (rate >= VCO_LOW && rate < VCO_MID)
+		val |= (1 << PLL_VCO_LOW_SHIFT);
+
+	if (rate < VCO_HIGH)
+		val &= ~(1 << PLL_VCO_HIGH_SHIFT);
+	else
+		val |= (1 << PLL_VCO_HIGH_SHIFT);
+
+	writel(val, pll->pll_base + ctrl->vco_ctrl.l_offset);
+
+	/* program integer part of NDIV */
+	val = readl(pll->pll_base + ctrl->ndiv_int.offset);
+	val &= ~(bit_mask(ctrl->ndiv_int.width) << ctrl->ndiv_int.shift);
+	val |= vco->ndiv_int << ctrl->ndiv_int.shift;
+	writel(val, pll->pll_base + ctrl->ndiv_int.offset);
+
+	/* program fractional part of NDIV */
+	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
+		val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
+		val &= ~(bit_mask(ctrl->ndiv_frac.width) <<
+				ctrl->ndiv_frac.shift);
+		val |= vco->ndiv_frac << ctrl->ndiv_frac.shift;
+		writel(val, pll->pll_base + ctrl->ndiv_frac.offset);
+	}
+
+	/* program PDIV */
+	val = readl(pll->pll_base + ctrl->pdiv.offset);
+	val &= ~(bit_mask(ctrl->pdiv.width) << ctrl->pdiv.shift);
+	val |= vco->pdiv << ctrl->pdiv.shift;
+	writel(val, pll->pll_base + ctrl->pdiv.offset);
+
+	__pll_bring_out_reset(pll, kp, ka, ki);
+
+	ret = pll_wait_for_lock(pll);
+	if (ret < 0) {
+		pr_err("%s: pll: %s failed to lock\n", __func__, pll->name);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int iproc_pll_enable(struct clk_hw *hw)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+
+	return __pll_enable(pll);
+}
+
+static void iproc_pll_disable(struct clk_hw *hw)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+
+	if (ctrl->flags & IPROC_CLK_AON)
+		return;
+
+	__pll_disable(pll);
+}
+
+static unsigned long iproc_pll_recalc_rate(struct clk_hw *hw,
+	unsigned long parent_rate)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+	u64 ndiv;
+	unsigned int ndiv_int, ndiv_frac, pdiv;
+
+	if (parent_rate == 0)
+		return 0;
+
+	/* PLL needs to be locked */
+	val = readl(pll->pll_base + ctrl->status.offset);
+	if ((val & (1 << ctrl->status.shift)) == 0) {
+		pll->rate = 0;
+		return 0;
+	}
+
+	/*
+	 * PLL output frequency =
+	 *
+	 * ((ndiv_int + ndiv_frac / 2^20) * (parent clock rate / pdiv)
+	 */
+	val = readl(pll->pll_base + ctrl->ndiv_int.offset);
+	ndiv_int = (val >> ctrl->ndiv_int.shift) &
+		bit_mask(ctrl->ndiv_int.width);
+	ndiv = ndiv_int << ctrl->ndiv_int.shift;
+
+	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
+		val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
+		ndiv_frac = (val >> ctrl->ndiv_frac.shift) &
+			bit_mask(ctrl->ndiv_frac.width);
+
+		if (ndiv_frac != 0)
+			ndiv = (ndiv_int << ctrl->ndiv_int.shift) | ndiv_frac;
+	}
+
+	val = readl(pll->pll_base + ctrl->pdiv.offset);
+	pdiv = (val >> ctrl->pdiv.shift) & bit_mask(ctrl->pdiv.width);
+
+	pll->rate = (ndiv * parent_rate) >> ctrl->ndiv_int.shift;
+
+	if (pdiv == 0)
+		pll->rate *= 2;
+	else
+		pll->rate /= pdiv;
+
+	return pll->rate;
+}
+
+static const struct clk_ops iproc_pll_ops = {
+	.enable = iproc_pll_enable,
+	.disable = iproc_pll_disable,
+	.recalc_rate = iproc_pll_recalc_rate,
+};
+
+void __init iproc_pll_setup(struct device_node *node,
+		const struct iproc_pll_ctrl *ctrl,
+		const struct iproc_pll_vco_freq_param *vco_param,
+		unsigned int num_vco_entries)
+{
+	int ret;
+	struct clk *clk;
+	struct iproc_pll *pll;
+	struct clk_init_data init;
+	const char *parent_name;
+	unsigned int rate;
+
+	if (WARN_ON(!ctrl))
+		return;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->pll_base = of_iomap(node, 0);
+	if (WARN_ON(!pll->pll_base))
+		goto err_pll_iomap;
+
+	pll->pwr_base = of_iomap(node, 1);
+	if (WARN_ON(!pll->pwr_base))
+		goto err_pwr_iomap;
+
+	/* some PLLs require gating control at the top ASIU level */
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		pll->asiu_base = of_iomap(node, 2);
+		if (WARN_ON(!pll->asiu_base))
+			goto err_asiu_iomap;
+	}
+
+	pll->ctrl = ctrl;
+	pll->name = node->name;
+	init.name = node->name;
+	init.ops = &iproc_pll_ops;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	pll->hw.init = &init;
+
+	/* configure the PLL to the desired VCO frequency if specified */
+	ret = of_property_read_u32(node, "clock-frequency", &rate);
+	if (!ret) {
+		unsigned long parent_rate;
+		int rate_index;
+
+		if (WARN_ON(!vco_param))
+			goto err_clk_register;
+
+		pll->num_vco_entries = num_vco_entries;
+		pll->vco_param = vco_param;
+
+		parent_rate = __get_rate(parent_name);
+		if (WARN_ON(!parent_rate))
+			goto err_clk_register;
+
+		rate_index = pll_get_rate_index(pll, rate);
+		if (WARN_ON(rate_index < 0))
+			goto err_clk_register;
+
+		ret = pll_set_rate(pll, rate_index, parent_rate);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+	}
+
+	clk = clk_register(NULL, &pll->hw);
+	if (WARN_ON(IS_ERR(clk)))
+		goto err_clk_register;
+
+	pll->clk_data.clk_num = 1;
+	pll->clk_data.clks = &clk;
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get,
+			&pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_add;
+
+	return;
+
+err_clk_add:
+	clk_unregister(clk);
+err_clk_register:
+	if (pll->asiu_base)
+		iounmap(pll->asiu_base);
+err_asiu_iomap:
+	iounmap(pll->pwr_base);
+err_pwr_iomap:
+	iounmap(pll->pll_base);
+err_pll_iomap:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc.h b/drivers/clk/bcm/clk-iproc.h
new file mode 100644
index 0000000..4aa0479
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc.h
@@ -0,0 +1,155 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _CLK_IPROC_H
+#define _CLK_IPROC_H
+
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/of.h>
+#include <linux/clk-provider.h>
+
+#define IPROC_CLK_NAME_LEN 25
+#define IPROC_CLK_INVALID_OFFSET 0xffffffff
+#define bit_mask(width) ((1 << (width)) - 1)
+
+/* clock should not be disabled at runtime */
+#define IPROC_CLK_AON BIT(0)
+
+/* PLL requires gating through ASIU */
+#define IPROC_CLK_PLL_ASIU BIT(1)
+
+/* PLL has fractional part of the NDIV */
+#define IPROC_CLK_PLL_HAS_NDIV_FRAC BIT(2)
+
+/*
+ * Parameters for VCO frequency configuration
+ *
+ * VCO frequency =
+ * ((ndiv_int + ndiv_frac / 2^20) * (ref freqeuncy  / pdiv)
+ */
+struct iproc_pll_vco_freq_param {
+	unsigned long rate;
+	unsigned int ndiv_int;
+	unsigned int ndiv_frac;
+	unsigned int pdiv;
+};
+
+struct iproc_clk_reg_op {
+	unsigned int offset;
+	unsigned int shift;
+	unsigned int width;
+};
+
+/*
+ * Clock gating control@the top ASIU level
+ */
+struct iproc_asiu_gate {
+	unsigned int offset;
+	unsigned int en_shift;
+};
+
+/*
+ * Control of powering on/off of a PLL
+ *
+ * Before powering off a PLL, input isolation (ISO) needs to be enabled
+ */
+struct iproc_pll_aon_pwr_ctrl {
+	unsigned int offset;
+	unsigned int pwr_width;
+	unsigned int pwr_shift;
+	unsigned int iso_shift;
+};
+
+/*
+ * Control of the PLL reset, with Ki, Kp, and Ka parameters
+ */
+struct iproc_pll_reset_ctrl {
+	unsigned int offset;
+	unsigned int reset_shift;
+	unsigned int p_reset_shift;
+	unsigned int ki_shift;
+	unsigned int ki_width;
+	unsigned int kp_shift;
+	unsigned int kp_width;
+	unsigned int ka_shift;
+	unsigned int ka_width;
+};
+
+struct iproc_pll_vco_ctrl {
+	unsigned int u_offset;
+	unsigned int l_offset;
+};
+
+/*
+ * Main PLL control parameters
+ */
+struct iproc_pll_ctrl {
+	unsigned long flags;
+	struct iproc_pll_aon_pwr_ctrl aon;
+	struct iproc_asiu_gate asiu;
+	struct iproc_pll_reset_ctrl reset;
+	struct iproc_clk_reg_op ndiv_int;
+	struct iproc_clk_reg_op ndiv_frac;
+	struct iproc_clk_reg_op pdiv;
+	struct iproc_pll_vco_ctrl vco_ctrl;
+	struct iproc_clk_reg_op status;
+};
+
+/*
+ * Controls enabling/disabling a PLL derived clock
+ */
+struct iproc_clk_enable_ctrl {
+	unsigned int offset;
+	unsigned int enable_shift;
+	unsigned int hold_shift;
+	unsigned int bypass_shift;
+};
+
+/*
+ * Main clock control parameters for clocks derived from the PLLs
+ */
+struct iproc_clk_ctrl {
+	unsigned int channel;
+	unsigned long flags;
+	struct iproc_clk_enable_ctrl enable;
+	struct iproc_clk_reg_op mdiv;
+};
+
+/*
+ * Divisor of the ASIU clocks
+ */
+struct iproc_asiu_div {
+	unsigned int offset;
+	unsigned int en_shift;
+	unsigned int high_shift;
+	unsigned int high_width;
+	unsigned int low_shift;
+	unsigned int low_width;
+};
+
+extern void __init iproc_armpll_setup(struct device_node *node);
+extern void __init iproc_pll_setup(struct device_node *node,
+		const struct iproc_pll_ctrl *ctrl,
+		const struct iproc_pll_vco_freq_param *vco_param,
+		unsigned int num_freqs);
+extern void __init iproc_clk_setup(struct device_node *node,
+		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks);
+extern void __init iproc_asiu_setup(struct device_node *node,
+		const struct iproc_asiu_div *div,
+		const struct iproc_asiu_gate *gate, unsigned int num_clks);
+
+#endif /* _CLK_IPROC_H */
-- 
1.7.9.5

[PATCH v3 3/5] clk: Change bcm clocks build dependency

[Ray Jui]

The clock code under drivers/clk/bcm now contains code for both the
Broadcom mobile SoCs and the iProc SoCs. Change the the makefile
dependency to be under config flag CONFIG_ARCH_BCM that's enabled for
both families of SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 drivers/clk/Makefile |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index d5fba5b..eff0213 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -41,7 +41,7 @@ obj-$(CONFIG_ARCH_VT8500)		+= clk-vt8500.o
 obj-$(CONFIG_COMMON_CLK_WM831X)		+= clk-wm831x.o
 obj-$(CONFIG_COMMON_CLK_XGENE)		+= clk-xgene.o
 obj-$(CONFIG_COMMON_CLK_AT91)		+= at91/
-obj-$(CONFIG_ARCH_BCM_MOBILE)		+= bcm/
+obj-$(CONFIG_ARCH_BCM)			+= bcm/
 obj-$(CONFIG_ARCH_BERLIN)		+= berlin/
 obj-$(CONFIG_ARCH_HI3xxx)		+= hisilicon/
 obj-$(CONFIG_ARCH_HIP04)		+= hisilicon/
-- 
1.7.9.5

[PATCH v3 3/5] clk: Change bcm clocks build dependency

[Ray Jui]

The clock code under drivers/clk/bcm now contains code for both the
Broadcom mobile SoCs and the iProc SoCs. Change the the makefile
dependency to be under config flag CONFIG_ARCH_BCM that's enabled for
both families of SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 drivers/clk/Makefile |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index d5fba5b..eff0213 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -41,7 +41,7 @@ obj-$(CONFIG_ARCH_VT8500)		+= clk-vt8500.o
 obj-$(CONFIG_COMMON_CLK_WM831X)		+= clk-wm831x.o
 obj-$(CONFIG_COMMON_CLK_XGENE)		+= clk-xgene.o
 obj-$(CONFIG_COMMON_CLK_AT91)		+= at91/
-obj-$(CONFIG_ARCH_BCM_MOBILE)		+= bcm/
+obj-$(CONFIG_ARCH_BCM)			+= bcm/
 obj-$(CONFIG_ARCH_BERLIN)		+= berlin/
 obj-$(CONFIG_ARCH_HI3xxx)		+= hisilicon/
 obj-$(CONFIG_ARCH_HIP04)		+= hisilicon/
-- 
1.7.9.5

[PATCH v3 3/5] clk: Change bcm clocks build dependency

[Ray Jui]

The clock code under drivers/clk/bcm now contains code for both the
Broadcom mobile SoCs and the iProc SoCs. Change the the makefile
dependency to be under config flag CONFIG_ARCH_BCM that's enabled for
both families of SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 drivers/clk/Makefile |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index d5fba5b..eff0213 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -41,7 +41,7 @@ obj-$(CONFIG_ARCH_VT8500)		+= clk-vt8500.o
 obj-$(CONFIG_COMMON_CLK_WM831X)		+= clk-wm831x.o
 obj-$(CONFIG_COMMON_CLK_XGENE)		+= clk-xgene.o
 obj-$(CONFIG_COMMON_CLK_AT91)		+= at91/
-obj-$(CONFIG_ARCH_BCM_MOBILE)		+= bcm/
+obj-$(CONFIG_ARCH_BCM)			+= bcm/
 obj-$(CONFIG_ARCH_BERLIN)		+= berlin/
 obj-$(CONFIG_ARCH_HI3xxx)		+= hisilicon/
 obj-$(CONFIG_ARCH_HIP04)		+= hisilicon/
-- 
1.7.9.5

[PATCH v3 4/5] clk: cygnus: add clock support for Broadcom Cygnus

[Ray Jui]

The Broadcom Cygnus SoC is architected under the iProc architecture. It
has the following PLLs: ARMPLL, GENPLL, LCPLL0, MIPIPLL, all dervied
from an onboard crystal. Cygnus also has various ASIU clocks that are
derived directly from the onboard crystal.

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/clk/bcm/Makefile               |    1 +
 drivers/clk/bcm/clk-cygnus.c           |  277 ++++++++++++++++++++++++++++++++
 include/dt-bindings/clock/bcm-cygnus.h |   65 ++++++++
 3 files changed, 343 insertions(+)
 create mode 100644 drivers/clk/bcm/clk-cygnus.c
 create mode 100644 include/dt-bindings/clock/bcm-cygnus.h

diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
index 6926636..afcbe55 100644
--- a/drivers/clk/bcm/Makefile
+++ b/drivers/clk/bcm/Makefile
@@ -3,3 +3,4 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
 obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
+obj-$(CONFIG_ARCH_BCM_CYGNUS)	+= clk-cygnus.o
diff --git a/drivers/clk/bcm/clk-cygnus.c b/drivers/clk/bcm/clk-cygnus.c
new file mode 100644
index 0000000..3b79197
--- /dev/null
+++ b/drivers/clk/bcm/clk-cygnus.c
@@ -0,0 +1,277 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include <dt-bindings/clock/bcm-cygnus.h>
+#include "clk-iproc.h"
+
+#define reg_val(o, s, w) { .offset = o, .shift = s, .width = w, }
+
+#define aon_val(o, pw, ps, is) { .offset = o, .pwr_width = pw, \
+	.pwr_shift = ps, .iso_shift = is }
+
+#define asiu_div_val(o, es, hs, hw, ls, lw) \
+		{ .offset = o, .en_shift = es, .high_shift = hs, \
+		.high_width = hw, .low_shift = ls, .low_width = lw }
+
+#define reset_val(o, rs, prs, kis, kiw, kps, kpw, kas, kaw) { .offset = o, \
+	.reset_shift = rs, .p_reset_shift = prs, .ki_shift = kis, \
+	.ki_width = kiw, .kp_shift = kps, .kp_width = kpw, .ka_shift = kas, \
+	.ka_width = kaw }
+
+#define vco_ctrl_val(uo, lo) { .u_offset = uo, .l_offset = lo }
+
+#define enable_val(o, es, hs, bs) { .offset = o, .enable_shift = es, \
+	.hold_shift = hs, .bypass_shift = bs }
+
+#define asiu_gate_val(o, es) { .offset = o, .en_shift = es }
+
+static void __init cygnus_armpll_init(struct device_node *node)
+{
+	iproc_armpll_setup(node);
+}
+CLK_OF_DECLARE(cygnus_armpll, "brcm,cygnus-armpll", cygnus_armpll_init);
+
+static const struct iproc_pll_ctrl genpll = {
+	.flags = IPROC_CLK_AON | IPROC_CLK_PLL_HAS_NDIV_FRAC,
+	.aon = aon_val(0x0, 2, 1, 0),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 3),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static void __init cygnus_genpll_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &genpll, NULL, 0);
+}
+CLK_OF_DECLARE(cygnus_genpll, "brcm,cygnus-genpll", cygnus_genpll_init);
+
+static const struct iproc_pll_ctrl lcpll0 = {
+	.flags = IPROC_CLK_AON,
+	.aon = aon_val(0x0, 2, 5, 4),
+	.reset = reset_val(0x0, 31, 30, 27, 3, 23, 4, 19, 4),
+	.ndiv_int = reg_val(0x4, 16, 10),
+	.pdiv = reg_val(0x4, 26, 4),
+	.vco_ctrl = vco_ctrl_val(0x10, 0x14),
+	.status = reg_val(0x18, 12, 1),
+};
+
+static void __init cygnus_lcpll0_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &lcpll0, NULL, 0);
+}
+CLK_OF_DECLARE(cygnus_lcpll0, "brcm,cygnus-lcpll0", cygnus_lcpll0_init);
+
+/*
+ * MIPI PLL VCO frequency parameter table
+ */
+static const struct iproc_pll_vco_freq_param mipipll_vco_params[] = {
+	/* rate (Hz) ndiv_int ndiv_frac pdiv */
+	{ 750000000UL,   30,     0,        1 },
+	{ 1000000000UL,  40,     0,        1 },
+	{ 1350000000ul,  54,     0,        1 },
+	{ 2000000000UL,  80,     0,        1 },
+	{ 2100000000UL,  84,     0,        1 },
+	{ 2250000000UL,  90,     0,        1 },
+	{ 2500000000UL,  100,    0,        1 },
+	{ 2700000000UL,  54,     0,        0 },
+	{ 2975000000UL,  119,    0,        1 },
+	{ 3100000000UL,  124,    0,        1 },
+	{ 3150000000UL,  126,    0,        1 },
+};
+
+static const struct iproc_pll_ctrl mipipll = {
+	.flags = IPROC_CLK_PLL_ASIU | IPROC_CLK_PLL_HAS_NDIV_FRAC,
+	.aon = aon_val(0x0, 4, 17, 16),
+	.asiu = asiu_gate_val(0x0, 3),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 4),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static void __init cygnus_mipipll_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &mipipll, mipipll_vco_params,
+			ARRAY_SIZE(mipipll_vco_params));
+}
+CLK_OF_DECLARE(cygnus_mipipll, "brcm,cygnus-mipipll", cygnus_mipipll_init);
+
+static const struct iproc_clk_ctrl genpll_clk[] = {
+	[BCM_CYGNUS_GENPLL_AXI21_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AXI21_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 6, 0, 12),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_250MHZ_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_250MHZ_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 7, 1, 13),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_IHOST_SYS_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_IHOST_SYS_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 8, 2, 14),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_GENPLL_ENET_SW_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_ENET_SW_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 9, 3, 15),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_AUDIO_125_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AUDIO_125_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 10, 4, 16),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_CAN_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_CAN_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 11, 5, 17),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static void __init cygnus_genpll_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, genpll_clk, ARRAY_SIZE(genpll_clk));
+}
+CLK_OF_DECLARE(cygnus_genpll_clk, "brcm,cygnus-genpll-clk",
+		cygnus_genpll_clk_init);
+
+static const struct iproc_clk_ctrl lcpll0_clk[] = {
+	[BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 7, 1, 13),
+		.mdiv = reg_val(0x8, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_DDR_PHY_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_DDR_PHY_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 8, 2, 14),
+		.mdiv = reg_val(0x8, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SDIO_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SDIO_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 9, 3, 15),
+		.mdiv = reg_val(0x8, 20, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 10, 4, 16),
+		.mdiv = reg_val(0xc, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SMART_CARD_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SMART_CARD_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 11, 5, 17),
+		.mdiv = reg_val(0xc, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_LCPLL0_CH5_UNUSED,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 12, 6, 18),
+		.mdiv = reg_val(0xc, 20, 8),
+	},
+};
+
+static void __init cygnus_lcpll0_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, lcpll0_clk, ARRAY_SIZE(lcpll0_clk));
+}
+CLK_OF_DECLARE(cygnus_lcpll0_clk, "brcm,cygnus-lcpll0-clk",
+		cygnus_lcpll0_clk_init);
+
+static const struct iproc_clk_ctrl mipipll_clk[] = {
+	[BCM_CYGNUS_MIPIPLL_CH0_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH0_UNUSED,
+		.enable = enable_val(0x4, 12, 6, 18),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH1_LCD] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH1_LCD,
+		.enable = enable_val(0x4, 13, 7, 19),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH2_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH2_UNUSED,
+		.enable = enable_val(0x4, 14, 8, 20),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH3_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH3_UNUSED,
+		.enable = enable_val(0x4, 15, 9, 21),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH4_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH4_UNUSED,
+		.enable = enable_val(0x4, 16, 10, 22),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH5_UNUSED,
+		.enable = enable_val(0x4, 17, 11, 23),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static void __init cygnus_mipipll_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, mipipll_clk, ARRAY_SIZE(mipipll_clk));
+}
+CLK_OF_DECLARE(cygnus_mipipll_clk, "brcm,cygnus-mipipll-clk",
+		cygnus_mipipll_clk_init);
+
+static const struct iproc_asiu_div asiu_div[] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
+		asiu_div_val(0x0, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_ADC_CLK] =
+		asiu_div_val(0x4, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_PWM_CLK] =
+		asiu_div_val(0x8, 31, 16, 10, 0, 10),
+};
+
+static const struct iproc_asiu_gate asiu_gate[] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
+		asiu_gate_val(0x0, 7),
+	[BCM_CYGNUS_ASIU_ADC_CLK] =
+		asiu_gate_val(0x0, 9),
+	[BCM_CYGNUS_ASIU_PWM_CLK] =
+		asiu_gate_val(IPROC_CLK_INVALID_OFFSET, 0),
+};
+
+static void __init cygnus_asiu_init(struct device_node *node)
+{
+	iproc_asiu_setup(node, asiu_div, asiu_gate, ARRAY_SIZE(asiu_div));
+}
+CLK_OF_DECLARE(cygnus_asiu_clk, "brcm,cygnus-asiu-clk", cygnus_asiu_init);
diff --git a/include/dt-bindings/clock/bcm-cygnus.h b/include/dt-bindings/clock/bcm-cygnus.h
new file mode 100644
index 0000000..8ec8a72
--- /dev/null
+++ b/include/dt-bindings/clock/bcm-cygnus.h
@@ -0,0 +1,65 @@
+/*
+ *  BSD LICENSE
+ *
+ *  Copyright(c) 2014 Broadcom Corporation.  All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in
+ *      the documentation and/or other materials provided with the
+ *      distribution.
+ *    * Neither the name of Broadcom Corporation nor the names of its
+ *      contributors may be used to endorse or promote products derived
+ *      from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _CLOCK_BCM_CYGNUS_H
+#define _CLOCK_BCM_CYGNUS_H
+
+/* GENPLL clock channel ID */
+#define BCM_CYGNUS_GENPLL_AXI21_CLK          0
+#define BCM_CYGNUS_GENPLL_250MHZ_CLK         1
+#define BCM_CYGNUS_GENPLL_IHOST_SYS_CLK      2
+#define BCM_CYGNUS_GENPLL_ENET_SW_CLK        3
+#define BCM_CYGNUS_GENPLL_AUDIO_125_CLK      4
+#define BCM_CYGNUS_GENPLL_CAN_CLK            5
+
+/* LCPLL0 clock channel ID */
+#define BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK    0
+#define BCM_CYGNUS_LCPLL0_DDR_PHY_CLK         1
+#define BCM_CYGNUS_LCPLL0_SDIO_CLK            2
+#define BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK     3
+#define BCM_CYGNUS_LCPLL0_SMART_CARD_CLK      4
+#define BCM_CYGNUS_LCPLL0_CH5_UNUSED          5
+
+/* MIPI PLL clock channel ID */
+#define BCM_CYGNUS_MIPIPLL_CH0_UNUSED         0
+#define BCM_CYGNUS_MIPIPLL_CH1_LCD            1
+#define BCM_CYGNUS_MIPIPLL_CH2_UNUSED         2
+#define BCM_CYGNUS_MIPIPLL_CH3_UNUSED         3
+#define BCM_CYGNUS_MIPIPLL_CH4_UNUSED         4
+#define BCM_CYGNUS_MIPIPLL_CH5_UNUSED         5
+
+/* ASIU clock IDs */
+#define BCM_CYGNUS_ASIU_KEYPAD_CLK    0
+#define BCM_CYGNUS_ASIU_ADC_CLK       1
+#define BCM_CYGNUS_ASIU_PWM_CLK       2
+
+#endif /* _CLOCK_BCM_CYGNUS_H */
-- 
1.7.9.5

[PATCH v3 4/5] clk: cygnus: add clock support for Broadcom Cygnus

[Ray Jui]

The Broadcom Cygnus SoC is architected under the iProc architecture. It
has the following PLLs: ARMPLL, GENPLL, LCPLL0, MIPIPLL, all dervied
from an onboard crystal. Cygnus also has various ASIU clocks that are
derived directly from the onboard crystal.

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/clk/bcm/Makefile               |    1 +
 drivers/clk/bcm/clk-cygnus.c           |  277 ++++++++++++++++++++++++++++++++
 include/dt-bindings/clock/bcm-cygnus.h |   65 ++++++++
 3 files changed, 343 insertions(+)
 create mode 100644 drivers/clk/bcm/clk-cygnus.c
 create mode 100644 include/dt-bindings/clock/bcm-cygnus.h

diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
index 6926636..afcbe55 100644
--- a/drivers/clk/bcm/Makefile
+++ b/drivers/clk/bcm/Makefile
@@ -3,3 +3,4 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
 obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
+obj-$(CONFIG_ARCH_BCM_CYGNUS)	+= clk-cygnus.o
diff --git a/drivers/clk/bcm/clk-cygnus.c b/drivers/clk/bcm/clk-cygnus.c
new file mode 100644
index 0000000..3b79197
--- /dev/null
+++ b/drivers/clk/bcm/clk-cygnus.c
@@ -0,0 +1,277 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include <dt-bindings/clock/bcm-cygnus.h>
+#include "clk-iproc.h"
+
+#define reg_val(o, s, w) { .offset = o, .shift = s, .width = w, }
+
+#define aon_val(o, pw, ps, is) { .offset = o, .pwr_width = pw, \
+	.pwr_shift = ps, .iso_shift = is }
+
+#define asiu_div_val(o, es, hs, hw, ls, lw) \
+		{ .offset = o, .en_shift = es, .high_shift = hs, \
+		.high_width = hw, .low_shift = ls, .low_width = lw }
+
+#define reset_val(o, rs, prs, kis, kiw, kps, kpw, kas, kaw) { .offset = o, \
+	.reset_shift = rs, .p_reset_shift = prs, .ki_shift = kis, \
+	.ki_width = kiw, .kp_shift = kps, .kp_width = kpw, .ka_shift = kas, \
+	.ka_width = kaw }
+
+#define vco_ctrl_val(uo, lo) { .u_offset = uo, .l_offset = lo }
+
+#define enable_val(o, es, hs, bs) { .offset = o, .enable_shift = es, \
+	.hold_shift = hs, .bypass_shift = bs }
+
+#define asiu_gate_val(o, es) { .offset = o, .en_shift = es }
+
+static void __init cygnus_armpll_init(struct device_node *node)
+{
+	iproc_armpll_setup(node);
+}
+CLK_OF_DECLARE(cygnus_armpll, "brcm,cygnus-armpll", cygnus_armpll_init);
+
+static const struct iproc_pll_ctrl genpll = {
+	.flags = IPROC_CLK_AON | IPROC_CLK_PLL_HAS_NDIV_FRAC,
+	.aon = aon_val(0x0, 2, 1, 0),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 3),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static void __init cygnus_genpll_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &genpll, NULL, 0);
+}
+CLK_OF_DECLARE(cygnus_genpll, "brcm,cygnus-genpll", cygnus_genpll_init);
+
+static const struct iproc_pll_ctrl lcpll0 = {
+	.flags = IPROC_CLK_AON,
+	.aon = aon_val(0x0, 2, 5, 4),
+	.reset = reset_val(0x0, 31, 30, 27, 3, 23, 4, 19, 4),
+	.ndiv_int = reg_val(0x4, 16, 10),
+	.pdiv = reg_val(0x4, 26, 4),
+	.vco_ctrl = vco_ctrl_val(0x10, 0x14),
+	.status = reg_val(0x18, 12, 1),
+};
+
+static void __init cygnus_lcpll0_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &lcpll0, NULL, 0);
+}
+CLK_OF_DECLARE(cygnus_lcpll0, "brcm,cygnus-lcpll0", cygnus_lcpll0_init);
+
+/*
+ * MIPI PLL VCO frequency parameter table
+ */
+static const struct iproc_pll_vco_freq_param mipipll_vco_params[] = {
+	/* rate (Hz) ndiv_int ndiv_frac pdiv */
+	{ 750000000UL,   30,     0,        1 },
+	{ 1000000000UL,  40,     0,        1 },
+	{ 1350000000ul,  54,     0,        1 },
+	{ 2000000000UL,  80,     0,        1 },
+	{ 2100000000UL,  84,     0,        1 },
+	{ 2250000000UL,  90,     0,        1 },
+	{ 2500000000UL,  100,    0,        1 },
+	{ 2700000000UL,  54,     0,        0 },
+	{ 2975000000UL,  119,    0,        1 },
+	{ 3100000000UL,  124,    0,        1 },
+	{ 3150000000UL,  126,    0,        1 },
+};
+
+static const struct iproc_pll_ctrl mipipll = {
+	.flags = IPROC_CLK_PLL_ASIU | IPROC_CLK_PLL_HAS_NDIV_FRAC,
+	.aon = aon_val(0x0, 4, 17, 16),
+	.asiu = asiu_gate_val(0x0, 3),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 4),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static void __init cygnus_mipipll_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &mipipll, mipipll_vco_params,
+			ARRAY_SIZE(mipipll_vco_params));
+}
+CLK_OF_DECLARE(cygnus_mipipll, "brcm,cygnus-mipipll", cygnus_mipipll_init);
+
+static const struct iproc_clk_ctrl genpll_clk[] = {
+	[BCM_CYGNUS_GENPLL_AXI21_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AXI21_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 6, 0, 12),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_250MHZ_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_250MHZ_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 7, 1, 13),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_IHOST_SYS_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_IHOST_SYS_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 8, 2, 14),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_GENPLL_ENET_SW_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_ENET_SW_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 9, 3, 15),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_AUDIO_125_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AUDIO_125_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 10, 4, 16),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_CAN_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_CAN_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 11, 5, 17),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static void __init cygnus_genpll_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, genpll_clk, ARRAY_SIZE(genpll_clk));
+}
+CLK_OF_DECLARE(cygnus_genpll_clk, "brcm,cygnus-genpll-clk",
+		cygnus_genpll_clk_init);
+
+static const struct iproc_clk_ctrl lcpll0_clk[] = {
+	[BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 7, 1, 13),
+		.mdiv = reg_val(0x8, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_DDR_PHY_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_DDR_PHY_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 8, 2, 14),
+		.mdiv = reg_val(0x8, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SDIO_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SDIO_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 9, 3, 15),
+		.mdiv = reg_val(0x8, 20, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 10, 4, 16),
+		.mdiv = reg_val(0xc, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SMART_CARD_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SMART_CARD_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 11, 5, 17),
+		.mdiv = reg_val(0xc, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_LCPLL0_CH5_UNUSED,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 12, 6, 18),
+		.mdiv = reg_val(0xc, 20, 8),
+	},
+};
+
+static void __init cygnus_lcpll0_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, lcpll0_clk, ARRAY_SIZE(lcpll0_clk));
+}
+CLK_OF_DECLARE(cygnus_lcpll0_clk, "brcm,cygnus-lcpll0-clk",
+		cygnus_lcpll0_clk_init);
+
+static const struct iproc_clk_ctrl mipipll_clk[] = {
+	[BCM_CYGNUS_MIPIPLL_CH0_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH0_UNUSED,
+		.enable = enable_val(0x4, 12, 6, 18),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH1_LCD] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH1_LCD,
+		.enable = enable_val(0x4, 13, 7, 19),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH2_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH2_UNUSED,
+		.enable = enable_val(0x4, 14, 8, 20),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH3_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH3_UNUSED,
+		.enable = enable_val(0x4, 15, 9, 21),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH4_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH4_UNUSED,
+		.enable = enable_val(0x4, 16, 10, 22),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH5_UNUSED,
+		.enable = enable_val(0x4, 17, 11, 23),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static void __init cygnus_mipipll_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, mipipll_clk, ARRAY_SIZE(mipipll_clk));
+}
+CLK_OF_DECLARE(cygnus_mipipll_clk, "brcm,cygnus-mipipll-clk",
+		cygnus_mipipll_clk_init);
+
+static const struct iproc_asiu_div asiu_div[] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
+		asiu_div_val(0x0, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_ADC_CLK] =
+		asiu_div_val(0x4, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_PWM_CLK] =
+		asiu_div_val(0x8, 31, 16, 10, 0, 10),
+};
+
+static const struct iproc_asiu_gate asiu_gate[] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
+		asiu_gate_val(0x0, 7),
+	[BCM_CYGNUS_ASIU_ADC_CLK] =
+		asiu_gate_val(0x0, 9),
+	[BCM_CYGNUS_ASIU_PWM_CLK] =
+		asiu_gate_val(IPROC_CLK_INVALID_OFFSET, 0),
+};
+
+static void __init cygnus_asiu_init(struct device_node *node)
+{
+	iproc_asiu_setup(node, asiu_div, asiu_gate, ARRAY_SIZE(asiu_div));
+}
+CLK_OF_DECLARE(cygnus_asiu_clk, "brcm,cygnus-asiu-clk", cygnus_asiu_init);
diff --git a/include/dt-bindings/clock/bcm-cygnus.h b/include/dt-bindings/clock/bcm-cygnus.h
new file mode 100644
index 0000000..8ec8a72
--- /dev/null
+++ b/include/dt-bindings/clock/bcm-cygnus.h
@@ -0,0 +1,65 @@
+/*
+ *  BSD LICENSE
+ *
+ *  Copyright(c) 2014 Broadcom Corporation.  All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in
+ *      the documentation and/or other materials provided with the
+ *      distribution.
+ *    * Neither the name of Broadcom Corporation nor the names of its
+ *      contributors may be used to endorse or promote products derived
+ *      from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _CLOCK_BCM_CYGNUS_H
+#define _CLOCK_BCM_CYGNUS_H
+
+/* GENPLL clock channel ID */
+#define BCM_CYGNUS_GENPLL_AXI21_CLK          0
+#define BCM_CYGNUS_GENPLL_250MHZ_CLK         1
+#define BCM_CYGNUS_GENPLL_IHOST_SYS_CLK      2
+#define BCM_CYGNUS_GENPLL_ENET_SW_CLK        3
+#define BCM_CYGNUS_GENPLL_AUDIO_125_CLK      4
+#define BCM_CYGNUS_GENPLL_CAN_CLK            5
+
+/* LCPLL0 clock channel ID */
+#define BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK    0
+#define BCM_CYGNUS_LCPLL0_DDR_PHY_CLK         1
+#define BCM_CYGNUS_LCPLL0_SDIO_CLK            2
+#define BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK     3
+#define BCM_CYGNUS_LCPLL0_SMART_CARD_CLK      4
+#define BCM_CYGNUS_LCPLL0_CH5_UNUSED          5
+
+/* MIPI PLL clock channel ID */
+#define BCM_CYGNUS_MIPIPLL_CH0_UNUSED         0
+#define BCM_CYGNUS_MIPIPLL_CH1_LCD            1
+#define BCM_CYGNUS_MIPIPLL_CH2_UNUSED         2
+#define BCM_CYGNUS_MIPIPLL_CH3_UNUSED         3
+#define BCM_CYGNUS_MIPIPLL_CH4_UNUSED         4
+#define BCM_CYGNUS_MIPIPLL_CH5_UNUSED         5
+
+/* ASIU clock IDs */
+#define BCM_CYGNUS_ASIU_KEYPAD_CLK    0
+#define BCM_CYGNUS_ASIU_ADC_CLK       1
+#define BCM_CYGNUS_ASIU_PWM_CLK       2
+
+#endif /* _CLOCK_BCM_CYGNUS_H */
-- 
1.7.9.5

[PATCH v3 4/5] clk: cygnus: add clock support for Broadcom Cygnus

[Ray Jui]

The Broadcom Cygnus SoC is architected under the iProc architecture. It
has the following PLLs: ARMPLL, GENPLL, LCPLL0, MIPIPLL, all dervied
from an onboard crystal. Cygnus also has various ASIU clocks that are
derived directly from the onboard crystal.

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/clk/bcm/Makefile               |    1 +
 drivers/clk/bcm/clk-cygnus.c           |  277 ++++++++++++++++++++++++++++++++
 include/dt-bindings/clock/bcm-cygnus.h |   65 ++++++++
 3 files changed, 343 insertions(+)
 create mode 100644 drivers/clk/bcm/clk-cygnus.c
 create mode 100644 include/dt-bindings/clock/bcm-cygnus.h

diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
index 6926636..afcbe55 100644
--- a/drivers/clk/bcm/Makefile
+++ b/drivers/clk/bcm/Makefile
@@ -3,3 +3,4 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
 obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
+obj-$(CONFIG_ARCH_BCM_CYGNUS)	+= clk-cygnus.o
diff --git a/drivers/clk/bcm/clk-cygnus.c b/drivers/clk/bcm/clk-cygnus.c
new file mode 100644
index 0000000..3b79197
--- /dev/null
+++ b/drivers/clk/bcm/clk-cygnus.c
@@ -0,0 +1,277 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include <dt-bindings/clock/bcm-cygnus.h>
+#include "clk-iproc.h"
+
+#define reg_val(o, s, w) { .offset = o, .shift = s, .width = w, }
+
+#define aon_val(o, pw, ps, is) { .offset = o, .pwr_width = pw, \
+	.pwr_shift = ps, .iso_shift = is }
+
+#define asiu_div_val(o, es, hs, hw, ls, lw) \
+		{ .offset = o, .en_shift = es, .high_shift = hs, \
+		.high_width = hw, .low_shift = ls, .low_width = lw }
+
+#define reset_val(o, rs, prs, kis, kiw, kps, kpw, kas, kaw) { .offset = o, \
+	.reset_shift = rs, .p_reset_shift = prs, .ki_shift = kis, \
+	.ki_width = kiw, .kp_shift = kps, .kp_width = kpw, .ka_shift = kas, \
+	.ka_width = kaw }
+
+#define vco_ctrl_val(uo, lo) { .u_offset = uo, .l_offset = lo }
+
+#define enable_val(o, es, hs, bs) { .offset = o, .enable_shift = es, \
+	.hold_shift = hs, .bypass_shift = bs }
+
+#define asiu_gate_val(o, es) { .offset = o, .en_shift = es }
+
+static void __init cygnus_armpll_init(struct device_node *node)
+{
+	iproc_armpll_setup(node);
+}
+CLK_OF_DECLARE(cygnus_armpll, "brcm,cygnus-armpll", cygnus_armpll_init);
+
+static const struct iproc_pll_ctrl genpll = {
+	.flags = IPROC_CLK_AON | IPROC_CLK_PLL_HAS_NDIV_FRAC,
+	.aon = aon_val(0x0, 2, 1, 0),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 3),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static void __init cygnus_genpll_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &genpll, NULL, 0);
+}
+CLK_OF_DECLARE(cygnus_genpll, "brcm,cygnus-genpll", cygnus_genpll_init);
+
+static const struct iproc_pll_ctrl lcpll0 = {
+	.flags = IPROC_CLK_AON,
+	.aon = aon_val(0x0, 2, 5, 4),
+	.reset = reset_val(0x0, 31, 30, 27, 3, 23, 4, 19, 4),
+	.ndiv_int = reg_val(0x4, 16, 10),
+	.pdiv = reg_val(0x4, 26, 4),
+	.vco_ctrl = vco_ctrl_val(0x10, 0x14),
+	.status = reg_val(0x18, 12, 1),
+};
+
+static void __init cygnus_lcpll0_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &lcpll0, NULL, 0);
+}
+CLK_OF_DECLARE(cygnus_lcpll0, "brcm,cygnus-lcpll0", cygnus_lcpll0_init);
+
+/*
+ * MIPI PLL VCO frequency parameter table
+ */
+static const struct iproc_pll_vco_freq_param mipipll_vco_params[] = {
+	/* rate (Hz) ndiv_int ndiv_frac pdiv */
+	{ 750000000UL,   30,     0,        1 },
+	{ 1000000000UL,  40,     0,        1 },
+	{ 1350000000ul,  54,     0,        1 },
+	{ 2000000000UL,  80,     0,        1 },
+	{ 2100000000UL,  84,     0,        1 },
+	{ 2250000000UL,  90,     0,        1 },
+	{ 2500000000UL,  100,    0,        1 },
+	{ 2700000000UL,  54,     0,        0 },
+	{ 2975000000UL,  119,    0,        1 },
+	{ 3100000000UL,  124,    0,        1 },
+	{ 3150000000UL,  126,    0,        1 },
+};
+
+static const struct iproc_pll_ctrl mipipll = {
+	.flags = IPROC_CLK_PLL_ASIU | IPROC_CLK_PLL_HAS_NDIV_FRAC,
+	.aon = aon_val(0x0, 4, 17, 16),
+	.asiu = asiu_gate_val(0x0, 3),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 4),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static void __init cygnus_mipipll_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &mipipll, mipipll_vco_params,
+			ARRAY_SIZE(mipipll_vco_params));
+}
+CLK_OF_DECLARE(cygnus_mipipll, "brcm,cygnus-mipipll", cygnus_mipipll_init);
+
+static const struct iproc_clk_ctrl genpll_clk[] = {
+	[BCM_CYGNUS_GENPLL_AXI21_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AXI21_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 6, 0, 12),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_250MHZ_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_250MHZ_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 7, 1, 13),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_IHOST_SYS_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_IHOST_SYS_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 8, 2, 14),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_GENPLL_ENET_SW_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_ENET_SW_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 9, 3, 15),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_AUDIO_125_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AUDIO_125_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 10, 4, 16),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_CAN_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_CAN_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 11, 5, 17),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static void __init cygnus_genpll_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, genpll_clk, ARRAY_SIZE(genpll_clk));
+}
+CLK_OF_DECLARE(cygnus_genpll_clk, "brcm,cygnus-genpll-clk",
+		cygnus_genpll_clk_init);
+
+static const struct iproc_clk_ctrl lcpll0_clk[] = {
+	[BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 7, 1, 13),
+		.mdiv = reg_val(0x8, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_DDR_PHY_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_DDR_PHY_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 8, 2, 14),
+		.mdiv = reg_val(0x8, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SDIO_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SDIO_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 9, 3, 15),
+		.mdiv = reg_val(0x8, 20, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 10, 4, 16),
+		.mdiv = reg_val(0xc, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SMART_CARD_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SMART_CARD_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 11, 5, 17),
+		.mdiv = reg_val(0xc, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_LCPLL0_CH5_UNUSED,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 12, 6, 18),
+		.mdiv = reg_val(0xc, 20, 8),
+	},
+};
+
+static void __init cygnus_lcpll0_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, lcpll0_clk, ARRAY_SIZE(lcpll0_clk));
+}
+CLK_OF_DECLARE(cygnus_lcpll0_clk, "brcm,cygnus-lcpll0-clk",
+		cygnus_lcpll0_clk_init);
+
+static const struct iproc_clk_ctrl mipipll_clk[] = {
+	[BCM_CYGNUS_MIPIPLL_CH0_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH0_UNUSED,
+		.enable = enable_val(0x4, 12, 6, 18),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH1_LCD] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH1_LCD,
+		.enable = enable_val(0x4, 13, 7, 19),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH2_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH2_UNUSED,
+		.enable = enable_val(0x4, 14, 8, 20),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH3_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH3_UNUSED,
+		.enable = enable_val(0x4, 15, 9, 21),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH4_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH4_UNUSED,
+		.enable = enable_val(0x4, 16, 10, 22),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH5_UNUSED,
+		.enable = enable_val(0x4, 17, 11, 23),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static void __init cygnus_mipipll_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, mipipll_clk, ARRAY_SIZE(mipipll_clk));
+}
+CLK_OF_DECLARE(cygnus_mipipll_clk, "brcm,cygnus-mipipll-clk",
+		cygnus_mipipll_clk_init);
+
+static const struct iproc_asiu_div asiu_div[] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
+		asiu_div_val(0x0, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_ADC_CLK] =
+		asiu_div_val(0x4, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_PWM_CLK] =
+		asiu_div_val(0x8, 31, 16, 10, 0, 10),
+};
+
+static const struct iproc_asiu_gate asiu_gate[] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
+		asiu_gate_val(0x0, 7),
+	[BCM_CYGNUS_ASIU_ADC_CLK] =
+		asiu_gate_val(0x0, 9),
+	[BCM_CYGNUS_ASIU_PWM_CLK] =
+		asiu_gate_val(IPROC_CLK_INVALID_OFFSET, 0),
+};
+
+static void __init cygnus_asiu_init(struct device_node *node)
+{
+	iproc_asiu_setup(node, asiu_div, asiu_gate, ARRAY_SIZE(asiu_div));
+}
+CLK_OF_DECLARE(cygnus_asiu_clk, "brcm,cygnus-asiu-clk", cygnus_asiu_init);
diff --git a/include/dt-bindings/clock/bcm-cygnus.h b/include/dt-bindings/clock/bcm-cygnus.h
new file mode 100644
index 0000000..8ec8a72
--- /dev/null
+++ b/include/dt-bindings/clock/bcm-cygnus.h
@@ -0,0 +1,65 @@
+/*
+ *  BSD LICENSE
+ *
+ *  Copyright(c) 2014 Broadcom Corporation.  All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in
+ *      the documentation and/or other materials provided with the
+ *      distribution.
+ *    * Neither the name of Broadcom Corporation nor the names of its
+ *      contributors may be used to endorse or promote products derived
+ *      from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _CLOCK_BCM_CYGNUS_H
+#define _CLOCK_BCM_CYGNUS_H
+
+/* GENPLL clock channel ID */
+#define BCM_CYGNUS_GENPLL_AXI21_CLK          0
+#define BCM_CYGNUS_GENPLL_250MHZ_CLK         1
+#define BCM_CYGNUS_GENPLL_IHOST_SYS_CLK      2
+#define BCM_CYGNUS_GENPLL_ENET_SW_CLK        3
+#define BCM_CYGNUS_GENPLL_AUDIO_125_CLK      4
+#define BCM_CYGNUS_GENPLL_CAN_CLK            5
+
+/* LCPLL0 clock channel ID */
+#define BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK    0
+#define BCM_CYGNUS_LCPLL0_DDR_PHY_CLK         1
+#define BCM_CYGNUS_LCPLL0_SDIO_CLK            2
+#define BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK     3
+#define BCM_CYGNUS_LCPLL0_SMART_CARD_CLK      4
+#define BCM_CYGNUS_LCPLL0_CH5_UNUSED          5
+
+/* MIPI PLL clock channel ID */
+#define BCM_CYGNUS_MIPIPLL_CH0_UNUSED         0
+#define BCM_CYGNUS_MIPIPLL_CH1_LCD            1
+#define BCM_CYGNUS_MIPIPLL_CH2_UNUSED         2
+#define BCM_CYGNUS_MIPIPLL_CH3_UNUSED         3
+#define BCM_CYGNUS_MIPIPLL_CH4_UNUSED         4
+#define BCM_CYGNUS_MIPIPLL_CH5_UNUSED         5
+
+/* ASIU clock IDs */
+#define BCM_CYGNUS_ASIU_KEYPAD_CLK    0
+#define BCM_CYGNUS_ASIU_ADC_CLK       1
+#define BCM_CYGNUS_ASIU_PWM_CLK       2
+
+#endif /* _CLOCK_BCM_CYGNUS_H */
-- 
1.7.9.5

[PATCH v3 5/5] ARM: dts: enable clock support for Broadcom Cygnus

[Ray Jui]

Replace current device tree dummy clocks with real clock support for
Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbraden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus-clock.dtsi |  110 ++++++++++++++++++++++++-------
 arch/arm/boot/dts/bcm-cygnus.dtsi       |    2 +-
 2 files changed, 86 insertions(+), 26 deletions(-)

diff --git a/arch/arm/boot/dts/bcm-cygnus-clock.dtsi b/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
index 60d8389..f2da5e2 100644
--- a/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
@@ -36,56 +36,116 @@ clocks {
 	ranges;
 
 	osc: oscillator {
+		#clock-cells = <0>;
 		compatible = "fixed-clock";
-		#clock-cells = <1>;
 		clock-frequency = <25000000>;
 	};
 
-	apb_clk: apb_clk {
-		compatible = "fixed-clock";
+	/* Cygnus ARM PLL */
+	armpll: armpll {
 		#clock-cells = <0>;
-		clock-frequency = <1000000000>;
+		compatible = "brcm,cygnus-armpll";
+		clocks = <&osc>;
+		reg = <0x19000000 0x1000>;
 	};
 
-	periph_clk: periph_clk {
-		compatible = "fixed-clock";
+	/* peripheral clock for system timer */
+	arm_periph_clk: arm_periph_clk {
 		#clock-cells = <0>;
-		clock-frequency = <500000000>;
+		compatible = "fixed-factor-clock";
+		clocks = <&armpll>;
+		clock-div = <2>;
+		clock-mult = <1>;
 	};
 
-	sdio_clk: lcpll_ch2 {
-		compatible = "fixed-clock";
+	/* APB bus clock */
+	apb_clk: apb_clk {
 		#clock-cells = <0>;
-		clock-frequency = <200000000>;
+		compatible = "fixed-factor-clock";
+		clocks = <&armpll>;
+		clock-div = <4>;
+		clock-mult = <1>;
 	};
 
-	axi81_clk: axi81_clk {
-		compatible = "fixed-clock";
+	genpll: genpll {
 		#clock-cells = <0>;
-		clock-frequency = <100000000>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
 	};
 
-	keypad_clk: keypad_clk {
-		compatible = "fixed-clock";
+	/* various clocks running off the GENPLL */
+	genpll_clks: genpll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-genpll-clk";
+		reg = <0x0301d000 0x2c>;
+		clocks = <&genpll>;
+		clock-output-names = "axi21", "250mhz", "ihost_sys",
+			"enet_sw", "audio_125", "can";
+	};
+
+	/* always 1/2 of the axi21 clock */
+	axi41_clk: axi41_clk {
 		#clock-cells = <0>;
-		clock-frequency = <31806>;
+		compatible = "fixed-factor-clock";
+		clocks = <&genpll_clks 0>;
+		clock-div = <2>;
+		clock-mult = <1>;
 	};
 
-	adc_clk: adc_clk {
-		compatible = "fixed-clock";
+	/* always 1/4 of the axi21 clock */
+	axi81_clk: axi81_clk {
 		#clock-cells = <0>;
-		clock-frequency = <1562500>;
+		compatible = "fixed-factor-clock";
+		clocks = <&genpll_clks 0>;
+		clock-div = <4>;
+		clock-mult = <1>;
 	};
 
-	pwm_clk: pwm_clk {
-		compatible = "fixed-clock";
+	lcpll0: lcpll0 {
 		#clock-cells = <0>;
-		clock-frequency = <1000000>;
+		compatible = "brcm,cygnus-lcpll0";
+		reg = <0x0301d02c 0x1c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
 	};
 
-	lcd_clk: mipipll_ch1 {
-		compatible = "fixed-clock";
+	/* various clocks running off the LCPLL0 */
+	lcpll0_clks: lcpll0_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-lcpll0-clk";
+		reg = <0x0301d02c 0x1c>;
+		clocks = <&lcpll0>;
+		clock-output-names = "pcie_phy", "ddr_phy", "sdio",
+			"usb_phy", "smart_card", "ch5";
+	};
+
+	mipipll: mipipll {
 		#clock-cells = <0>;
-		clock-frequency = <100000000>;
+		compatible = "brcm,cygnus-mipipll";
+		reg = <0x180a9800 0x2c>,
+			<0x0301c020 0x4>,
+			<0x180aa024 0x4>;
+		clock-frequency = <1350000000>;
+		clocks = <&osc>;
+	};
+
+	mipipll_clks: mipipll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-mipipll-clk";
+		reg = <0x180a9800 0x2c>;
+		clocks = <&mipipll>;
+		clock-output-names = "ch0_unused", "ch1_lcd", "ch2_unused",
+			"ch3_unused", "ch4_unused", "ch5_unused";
+	};
+
+	asiu_clks: asiu_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-asiu-clk";
+		reg = <0x0301d048 0xc>,
+			<0x180aa024 0x4>;
+		clocks = <&osc>;
+		clock-output-names = "keypad", "adc/touch", "pwm";
 	};
 };
diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..2b99e9c 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -134,7 +134,7 @@
 		compatible = "arm,cortex-a9-global-timer";
 		reg = <0x19020200 0x100>;
 		interrupts = <GIC_PPI 11 IRQ_TYPE_LEVEL_HIGH>;
-		clocks = <&periph_clk>;
+		clocks = <&arm_periph_clk>;
 	};
 
 };
-- 
1.7.9.5

[PATCH v3 5/5] ARM: dts: enable clock support for Broadcom Cygnus

[Ray Jui]

Replace current device tree dummy clocks with real clock support for
Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbraden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus-clock.dtsi |  110 ++++++++++++++++++++++++-------
 arch/arm/boot/dts/bcm-cygnus.dtsi       |    2 +-
 2 files changed, 86 insertions(+), 26 deletions(-)

diff --git a/arch/arm/boot/dts/bcm-cygnus-clock.dtsi b/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
index 60d8389..f2da5e2 100644
--- a/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
@@ -36,56 +36,116 @@ clocks {
 	ranges;
 
 	osc: oscillator {
+		#clock-cells = <0>;
 		compatible = "fixed-clock";
-		#clock-cells = <1>;
 		clock-frequency = <25000000>;
 	};
 
-	apb_clk: apb_clk {
-		compatible = "fixed-clock";
+	/* Cygnus ARM PLL */
+	armpll: armpll {
 		#clock-cells = <0>;
-		clock-frequency = <1000000000>;
+		compatible = "brcm,cygnus-armpll";
+		clocks = <&osc>;
+		reg = <0x19000000 0x1000>;
 	};
 
-	periph_clk: periph_clk {
-		compatible = "fixed-clock";
+	/* peripheral clock for system timer */
+	arm_periph_clk: arm_periph_clk {
 		#clock-cells = <0>;
-		clock-frequency = <500000000>;
+		compatible = "fixed-factor-clock";
+		clocks = <&armpll>;
+		clock-div = <2>;
+		clock-mult = <1>;
 	};
 
-	sdio_clk: lcpll_ch2 {
-		compatible = "fixed-clock";
+	/* APB bus clock */
+	apb_clk: apb_clk {
 		#clock-cells = <0>;
-		clock-frequency = <200000000>;
+		compatible = "fixed-factor-clock";
+		clocks = <&armpll>;
+		clock-div = <4>;
+		clock-mult = <1>;
 	};
 
-	axi81_clk: axi81_clk {
-		compatible = "fixed-clock";
+	genpll: genpll {
 		#clock-cells = <0>;
-		clock-frequency = <100000000>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
 	};
 
-	keypad_clk: keypad_clk {
-		compatible = "fixed-clock";
+	/* various clocks running off the GENPLL */
+	genpll_clks: genpll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-genpll-clk";
+		reg = <0x0301d000 0x2c>;
+		clocks = <&genpll>;
+		clock-output-names = "axi21", "250mhz", "ihost_sys",
+			"enet_sw", "audio_125", "can";
+	};
+
+	/* always 1/2 of the axi21 clock */
+	axi41_clk: axi41_clk {
 		#clock-cells = <0>;
-		clock-frequency = <31806>;
+		compatible = "fixed-factor-clock";
+		clocks = <&genpll_clks 0>;
+		clock-div = <2>;
+		clock-mult = <1>;
 	};
 
-	adc_clk: adc_clk {
-		compatible = "fixed-clock";
+	/* always 1/4 of the axi21 clock */
+	axi81_clk: axi81_clk {
 		#clock-cells = <0>;
-		clock-frequency = <1562500>;
+		compatible = "fixed-factor-clock";
+		clocks = <&genpll_clks 0>;
+		clock-div = <4>;
+		clock-mult = <1>;
 	};
 
-	pwm_clk: pwm_clk {
-		compatible = "fixed-clock";
+	lcpll0: lcpll0 {
 		#clock-cells = <0>;
-		clock-frequency = <1000000>;
+		compatible = "brcm,cygnus-lcpll0";
+		reg = <0x0301d02c 0x1c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
 	};
 
-	lcd_clk: mipipll_ch1 {
-		compatible = "fixed-clock";
+	/* various clocks running off the LCPLL0 */
+	lcpll0_clks: lcpll0_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-lcpll0-clk";
+		reg = <0x0301d02c 0x1c>;
+		clocks = <&lcpll0>;
+		clock-output-names = "pcie_phy", "ddr_phy", "sdio",
+			"usb_phy", "smart_card", "ch5";
+	};
+
+	mipipll: mipipll {
 		#clock-cells = <0>;
-		clock-frequency = <100000000>;
+		compatible = "brcm,cygnus-mipipll";
+		reg = <0x180a9800 0x2c>,
+			<0x0301c020 0x4>,
+			<0x180aa024 0x4>;
+		clock-frequency = <1350000000>;
+		clocks = <&osc>;
+	};
+
+	mipipll_clks: mipipll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-mipipll-clk";
+		reg = <0x180a9800 0x2c>;
+		clocks = <&mipipll>;
+		clock-output-names = "ch0_unused", "ch1_lcd", "ch2_unused",
+			"ch3_unused", "ch4_unused", "ch5_unused";
+	};
+
+	asiu_clks: asiu_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-asiu-clk";
+		reg = <0x0301d048 0xc>,
+			<0x180aa024 0x4>;
+		clocks = <&osc>;
+		clock-output-names = "keypad", "adc/touch", "pwm";
 	};
 };
diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..2b99e9c 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -134,7 +134,7 @@
 		compatible = "arm,cortex-a9-global-timer";
 		reg = <0x19020200 0x100>;
 		interrupts = <GIC_PPI 11 IRQ_TYPE_LEVEL_HIGH>;
-		clocks = <&periph_clk>;
+		clocks = <&arm_periph_clk>;
 	};
 
 };
-- 
1.7.9.5

[PATCH v3 5/5] ARM: dts: enable clock support for Broadcom Cygnus

[Ray Jui]

Replace current device tree dummy clocks with real clock support for
Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbraden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus-clock.dtsi |  110 ++++++++++++++++++++++++-------
 arch/arm/boot/dts/bcm-cygnus.dtsi       |    2 +-
 2 files changed, 86 insertions(+), 26 deletions(-)

diff --git a/arch/arm/boot/dts/bcm-cygnus-clock.dtsi b/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
index 60d8389..f2da5e2 100644
--- a/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
@@ -36,56 +36,116 @@ clocks {
 	ranges;
 
 	osc: oscillator {
+		#clock-cells = <0>;
 		compatible = "fixed-clock";
-		#clock-cells = <1>;
 		clock-frequency = <25000000>;
 	};
 
-	apb_clk: apb_clk {
-		compatible = "fixed-clock";
+	/* Cygnus ARM PLL */
+	armpll: armpll {
 		#clock-cells = <0>;
-		clock-frequency = <1000000000>;
+		compatible = "brcm,cygnus-armpll";
+		clocks = <&osc>;
+		reg = <0x19000000 0x1000>;
 	};
 
-	periph_clk: periph_clk {
-		compatible = "fixed-clock";
+	/* peripheral clock for system timer */
+	arm_periph_clk: arm_periph_clk {
 		#clock-cells = <0>;
-		clock-frequency = <500000000>;
+		compatible = "fixed-factor-clock";
+		clocks = <&armpll>;
+		clock-div = <2>;
+		clock-mult = <1>;
 	};
 
-	sdio_clk: lcpll_ch2 {
-		compatible = "fixed-clock";
+	/* APB bus clock */
+	apb_clk: apb_clk {
 		#clock-cells = <0>;
-		clock-frequency = <200000000>;
+		compatible = "fixed-factor-clock";
+		clocks = <&armpll>;
+		clock-div = <4>;
+		clock-mult = <1>;
 	};
 
-	axi81_clk: axi81_clk {
-		compatible = "fixed-clock";
+	genpll: genpll {
 		#clock-cells = <0>;
-		clock-frequency = <100000000>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
 	};
 
-	keypad_clk: keypad_clk {
-		compatible = "fixed-clock";
+	/* various clocks running off the GENPLL */
+	genpll_clks: genpll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-genpll-clk";
+		reg = <0x0301d000 0x2c>;
+		clocks = <&genpll>;
+		clock-output-names = "axi21", "250mhz", "ihost_sys",
+			"enet_sw", "audio_125", "can";
+	};
+
+	/* always 1/2 of the axi21 clock */
+	axi41_clk: axi41_clk {
 		#clock-cells = <0>;
-		clock-frequency = <31806>;
+		compatible = "fixed-factor-clock";
+		clocks = <&genpll_clks 0>;
+		clock-div = <2>;
+		clock-mult = <1>;
 	};
 
-	adc_clk: adc_clk {
-		compatible = "fixed-clock";
+	/* always 1/4 of the axi21 clock */
+	axi81_clk: axi81_clk {
 		#clock-cells = <0>;
-		clock-frequency = <1562500>;
+		compatible = "fixed-factor-clock";
+		clocks = <&genpll_clks 0>;
+		clock-div = <4>;
+		clock-mult = <1>;
 	};
 
-	pwm_clk: pwm_clk {
-		compatible = "fixed-clock";
+	lcpll0: lcpll0 {
 		#clock-cells = <0>;
-		clock-frequency = <1000000>;
+		compatible = "brcm,cygnus-lcpll0";
+		reg = <0x0301d02c 0x1c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
 	};
 
-	lcd_clk: mipipll_ch1 {
-		compatible = "fixed-clock";
+	/* various clocks running off the LCPLL0 */
+	lcpll0_clks: lcpll0_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-lcpll0-clk";
+		reg = <0x0301d02c 0x1c>;
+		clocks = <&lcpll0>;
+		clock-output-names = "pcie_phy", "ddr_phy", "sdio",
+			"usb_phy", "smart_card", "ch5";
+	};
+
+	mipipll: mipipll {
 		#clock-cells = <0>;
-		clock-frequency = <100000000>;
+		compatible = "brcm,cygnus-mipipll";
+		reg = <0x180a9800 0x2c>,
+			<0x0301c020 0x4>,
+			<0x180aa024 0x4>;
+		clock-frequency = <1350000000>;
+		clocks = <&osc>;
+	};
+
+	mipipll_clks: mipipll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-mipipll-clk";
+		reg = <0x180a9800 0x2c>;
+		clocks = <&mipipll>;
+		clock-output-names = "ch0_unused", "ch1_lcd", "ch2_unused",
+			"ch3_unused", "ch4_unused", "ch5_unused";
+	};
+
+	asiu_clks: asiu_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-asiu-clk";
+		reg = <0x0301d048 0xc>,
+			<0x180aa024 0x4>;
+		clocks = <&osc>;
+		clock-output-names = "keypad", "adc/touch", "pwm";
 	};
 };
diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..2b99e9c 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -134,7 +134,7 @@
 		compatible = "arm,cortex-a9-global-timer";
 		reg = <0x19020200 0x100>;
 		interrupts = <GIC_PPI 11 IRQ_TYPE_LEVEL_HIGH>;
-		clocks = <&periph_clk>;
+		clocks = <&arm_periph_clk>;
 	};
 
 };
-- 
1.7.9.5

Re: [PATCH v3 0/5] Add common clock support for Broadcom iProc architecture

[Arnd Bergmann]

On Wednesday 07 January 2015 11:22:43 Ray Jui wrote:
> This patchset contains the initial common clock support for Broadcom's iProc
> family of SoCs. The iProc clock architecture comprises of various PLLs, e.g.,
> ARMPLL, GENPLL, LCPLL0, MIPIPLL, and etc. An onboard crystal serves as the
> basic reference clock for these PLLs. Each PLL may have several leaf clocks.
> One special group of clocks is the ASIU clocks, which are dervied directly
> from the crystal reference clock.
> 

Looks good to me now.

	Arnd

[PATCH v3 0/5] Add common clock support for Broadcom iProc architecture

[Arnd Bergmann]

On Wednesday 07 January 2015 11:22:43 Ray Jui wrote:
> This patchset contains the initial common clock support for Broadcom's iProc
> family of SoCs. The iProc clock architecture comprises of various PLLs, e.g.,
> ARMPLL, GENPLL, LCPLL0, MIPIPLL, and etc. An onboard crystal serves as the
> basic reference clock for these PLLs. Each PLL may have several leaf clocks.
> One special group of clocks is the ASIU clocks, which are dervied directly
> from the crystal reference clock.
> 

Looks good to me now.

	Arnd

Re: [PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Linus Walleij]

On Fri, Nov 28, 2014 at 12:46 AM, Ray Jui <rjui@broadcom.com> wrote:

> Device tree binding documentation for Broadcom Cygnus pinctrl driver
>
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> ---
>  .../bindings/pinctrl/brcm,cygnus-pinctrl.txt       |   92 ++++++++++++++++++++
>  1 file changed, 92 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
>
> diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
> new file mode 100644
> index 0000000..86e4579
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
> @@ -0,0 +1,92 @@
> +Broadcom Cygnus Pin Controller
> +
> +The Cygnus pin controller supports setting the alternate functions of groups
> +of pins. Pinmux configuration on individual pins is not supported by the
> +Cygnus A0 SoC.
> +
> +Required properties:
> +
> +- compatible:
> +    Must be "brcm,cygnus-pinctrl"
> +
> +- reg:
> +    Define the base and range of the I/O address space that contain the Cygnus
> +pin control registers

The following is subnodes. Indicate clearly in the binding that these are
*not* properties of the main node, but individual subnodes.

> +- brcm,groups:
> +    This can be strings of one or more group names. This defines the group(s)
> +that one wants to configure
> +
> +- brcm,function:
> +    This is the alternate function that one wants to configure to. Valid
> +alternate functions are "alt1", "alt2", "alt3", "alt4"

NAK. We have standardized bindings for groups and functions,
and there are pending patches from Sören Brinkmann adding
this to the pinctrl DT parsing core.

Just use "groups" and "function" and refer to
Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt

Then "alt1", "alt2" etc are non-functional names of functions.
Use the real function names, like "spi0" or so. This
alt-business seems to be just a shortcut to make it
simple, don't do that.

Then you use e.g. "spi0" as a group name. I prefer you
call that "spi0_grp" or something to say it is a group of
pins associated with spi0, as spi0 is actually the
function.

If unsure of the definitions of group and function, refer
to Documentation/pinctrl.txt

Yours,
Linus Walleij

Re: [PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Linus Walleij]

On Fri, Nov 28, 2014 at 12:46 AM, Ray Jui <rjui@broadcom.com> wrote:

> Device tree binding documentation for Broadcom Cygnus pinctrl driver
>
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> ---
>  .../bindings/pinctrl/brcm,cygnus-pinctrl.txt       |   92 ++++++++++++++++++++
>  1 file changed, 92 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
>
> diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
> new file mode 100644
> index 0000000..86e4579
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
> @@ -0,0 +1,92 @@
> +Broadcom Cygnus Pin Controller
> +
> +The Cygnus pin controller supports setting the alternate functions of groups
> +of pins. Pinmux configuration on individual pins is not supported by the
> +Cygnus A0 SoC.
> +
> +Required properties:
> +
> +- compatible:
> +    Must be "brcm,cygnus-pinctrl"
> +
> +- reg:
> +    Define the base and range of the I/O address space that contain the Cygnus
> +pin control registers

The following is subnodes. Indicate clearly in the binding that these are
*not* properties of the main node, but individual subnodes.

> +- brcm,groups:
> +    This can be strings of one or more group names. This defines the group(s)
> +that one wants to configure
> +
> +- brcm,function:
> +    This is the alternate function that one wants to configure to. Valid
> +alternate functions are "alt1", "alt2", "alt3", "alt4"

NAK. We have standardized bindings for groups and functions,
and there are pending patches from Sören Brinkmann adding
this to the pinctrl DT parsing core.

Just use "groups" and "function" and refer to
Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt

Then "alt1", "alt2" etc are non-functional names of functions.
Use the real function names, like "spi0" or so. This
alt-business seems to be just a shortcut to make it
simple, don't do that.

Then you use e.g. "spi0" as a group name. I prefer you
call that "spi0_grp" or something to say it is a group of
pins associated with spi0, as spi0 is actually the
function.

If unsure of the definitions of group and function, refer
to Documentation/pinctrl.txt

Yours,
Linus Walleij

[PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Linus Walleij]

On Fri, Nov 28, 2014 at 12:46 AM, Ray Jui <rjui@broadcom.com> wrote:

> Device tree binding documentation for Broadcom Cygnus pinctrl driver
>
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> ---
>  .../bindings/pinctrl/brcm,cygnus-pinctrl.txt       |   92 ++++++++++++++++++++
>  1 file changed, 92 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
>
> diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
> new file mode 100644
> index 0000000..86e4579
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
> @@ -0,0 +1,92 @@
> +Broadcom Cygnus Pin Controller
> +
> +The Cygnus pin controller supports setting the alternate functions of groups
> +of pins. Pinmux configuration on individual pins is not supported by the
> +Cygnus A0 SoC.
> +
> +Required properties:
> +
> +- compatible:
> +    Must be "brcm,cygnus-pinctrl"
> +
> +- reg:
> +    Define the base and range of the I/O address space that contain the Cygnus
> +pin control registers

The following is subnodes. Indicate clearly in the binding that these are
*not* properties of the main node, but individual subnodes.

> +- brcm,groups:
> +    This can be strings of one or more group names. This defines the group(s)
> +that one wants to configure
> +
> +- brcm,function:
> +    This is the alternate function that one wants to configure to. Valid
> +alternate functions are "alt1", "alt2", "alt3", "alt4"

NAK. We have standardized bindings for groups and functions,
and there are pending patches from S?ren Brinkmann adding
this to the pinctrl DT parsing core.

Just use "groups" and "function" and refer to
Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt

Then "alt1", "alt2" etc are non-functional names of functions.
Use the real function names, like "spi0" or so. This
alt-business seems to be just a shortcut to make it
simple, don't do that.

Then you use e.g. "spi0" as a group name. I prefer you
call that "spi0_grp" or something to say it is a group of
pins associated with spi0, as spi0 is actually the
function.

If unsure of the definitions of group and function, refer
to Documentation/pinctrl.txt

Yours,
Linus Walleij

Re: [PATCH 2/4] pinctrl: cygnus: add initial pinctrl support

[Linus Walleij]

On Fri, Nov 28, 2014 at 12:46 AM, Ray Jui <rjui@broadcom.com> wrote:

> This adds the initial driver support for the Broadcom Cygnus pinctrl
> controller. The Cygnus pinctrl controller supports group based
> alternate function configuration
>
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
> ---
>  drivers/pinctrl/Kconfig              |    7 +
>  drivers/pinctrl/Makefile             |    1 +
>  drivers/pinctrl/pinctrl-bcm-cygnus.c |  753 ++++++++++++++++++++++++++++++++++

With the proliferation of Broadcom drivers, please first send a
patch moving pinctrl-bcm281xx.c and pinctrl-bcm2835.c to
drivers/pinctrl/broadcom or something, so we can collect them
there.

I don't know if the hardware has any similarity though, so invite
the authors of the previous drivers to review this code.

> +config PINCTRL_BCM_CYGNUS
> +       bool "Broadcom Cygnus pinctrl driver"
> +       depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
> +       select PINMUX
> +       select PINCONF
> +       select GENERIC_PINCONF

Nice that you use GENERIC_PINCONF! :)

> +/*
> + * Cygnus pinctrl core
> + *
> + * @pctl: pointer to pinctrl_dev
> + * @dev: pointer to the device
> + * @base: I/O register base for Cygnus pinctrl configuration
> + *
> + */
> +struct cygnus_pinctrl {
> +       struct pinctrl_dev *pctl;
> +       struct device *dev;
> +       void __iomem *base;
> +
> +       const struct pinctrl_pin_desc *pins;
> +       unsigned num_pins;

Why is this not simply just a part of struct pinctrl_desc?
Why does it have to be multiplied here?

> +/*
> + * List of groups of pins
> + */
> +static const unsigned gpio0_pins[] = { 12 };
> +static const unsigned gpio1_pins[] = { 13 };
> +static const unsigned gpio2_pins[] = { 14 };
> +static const unsigned gpio3_pins[] = { 15 };
> +static const unsigned gpio4_pins[] = { 16 };
> +static const unsigned gpio5_pins[] = { 17 };
> +static const unsigned gpio6_pins[] = { 18 };
> +static const unsigned gpio7_pins[] = { 19 };
> +static const unsigned gpio8_pins[] = { 20 };
> +static const unsigned gpio9_pins[] = { 21 };
> +static const unsigned gpio10_pins[] = { 22 };
> +static const unsigned gpio11_pins[] = { 23 };
> +static const unsigned gpio12_pins[] = { 24 };
> +static const unsigned gpio13_pins[] = { 25 };
> +static const unsigned gpio14_pins[] = { 26 };
> +static const unsigned gpio15_pins[] = { 27 };
> +static const unsigned gpio16_pins[] = { 28 };
> +static const unsigned gpio17_pins[] = { 29 };
> +static const unsigned gpio18_pins[] = { 30 };
> +static const unsigned gpio19_pins[] = { 31 };
> +static const unsigned gpio20_pins[] = { 32 };
> +static const unsigned gpio21_pins[] = { 33 };
> +static const unsigned gpio22_pins[] = { 34 };
> +static const unsigned gpio23_pins[] = { 35 };

Have you considered implementing .gpio_request_enable()
and .gpio_disable_free() to get around having to have one
group for each GPIO line?

> +static const unsigned pwm0_pins[] = { 38 };
> +static const unsigned pwm1_pins[] = { 39 };
> +static const unsigned pwm2_pins[] = { 40 };
> +static const unsigned pwm3_pins[] = { 41 };
> +static const unsigned sdio0_pins[] = { 94, 95, 96, 97, 98, 99 };
> +static const unsigned smart_card0_pins[] = { 42, 43, 44, 46, 47 };
> +static const unsigned smart_card1_pins[] = { 48, 49, 50, 52, 53 };
> +static const unsigned spi0_pins[] = { 54, 55, 56, 57 };
> +static const unsigned spi1_pins[] = { 58, 59, 60, 61 };
> +static const unsigned spi2_pins[] = { 62, 63, 64, 65 };
> +static const unsigned spi3_pins[] = { 66, 67, 68, 69 };
> +static const unsigned d1w_pins[] = { 10, 11 };
> +static const unsigned lcd_pins[] = { 126, 127, 128, 129, 130, 131, 132,        133,
> +       134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147,
> +       148, 149, 150, 151, 152, 153, 154, 155 };
> +static const unsigned uart0_pins[] = { 70, 71, 72, 73 };
> +static const unsigned uart1_dte_pins[] = { 75, 76, 77, 78 };
> +static const unsigned uart1_pins[] = { 74, 79, 80, 81 };
> +static const unsigned uart3_pins[] = { 82, 83 };
> +static const unsigned qspi_pins[] = { 104, 105, 106, 107 };
> +static const unsigned nand_pins[] = { 110, 111, 112, 113, 114, 115, 116, 117,
> +       118, 119, 120, 121, 122, 123, 124, 125 };
> +static const unsigned sdio0_cd_pins[] = { 103 };
> +static const unsigned sdio0_mmc_pins[] = { 100, 101, 102 };
> +static const unsigned can0_spi4_pins[] = { 86, 87 };
> +static const unsigned can1_spi4_pins[] = { 88, 89 };
> +static const unsigned sdio1_cd_pins[] = { 93 };
> +static const unsigned sdio1_led_pins[] = { 84, 85 };
> +static const unsigned sdio1_mmc_pins[] = { 90, 91, 92 };
> +static const unsigned camera_led_pins[] = { 156, 157, 158, 159, 160 };
> +static const unsigned camera_rgmii_pins[] = { 169, 170, 171, 169, 170, 171,
> +       172, 173 };
> +static const unsigned camera_sram_rgmii_pins[] = { 161, 162, 163, 164, 165,
> +       166, 167, 168 };
> +static const unsigned qspi_gpio_pins[] = { 108, 109 };
> +static const unsigned smart_card0_fcb_pins[] = { 45 };
> +static const unsigned smart_card1_fcb_pins[] = { 51 };
> +static const unsigned gpio0_3p3_pins[] = { 176 };
> +static const unsigned gpio1_3p3_pins[] = { 177 };
> +static const unsigned gpio2_3p3_pins[] = { 178 };

Looks good...

> +/*
> + * List of groups names. Need to match the order in cygnus_pin_groups
> + */
> +static const char * const cygnus_pin_group_names[] = {
> +       "gpio0",
> +       "gpio1",
> +       "gpio2",
> +       "gpio3",
> +       "gpio4",
> +       "gpio5",
> +       "gpio6",
> +       "gpio7",
> +       "gpio8",
> +       "gpio9",
> +       "gpio10",
> +       "gpio11",
> +       "gpio12",
> +       "gpio13",
> +       "gpio14",
> +       "gpio15",
> +       "gpio16",
> +       "gpio17",
> +       "gpio18",
> +       "gpio19",
> +       "gpio20",
> +       "gpio21",
> +       "gpio22",
> +       "gpio23",
> +       "pwm0",
> +       "pwm1",
> +       "pwm2",
> +       "pwm3",
> +       "sdio0",
> +       "smart_card0",
> +       "smart_card1",
> +       "spi0",
> +       "spi1",
> +       "spi2",
> +       "spi3",
> +       "d1w",
> +       "lcd",
> +       "uart0",
> +       "uart1_dte",
> +       "uart1",
> +       "uart3",
> +       "qspi",
> +       "nand",
> +       "sdio0_cd",
> +       "sdio0_mmc",
> +       "can0_spi4",
> +       "can1_spi4",
> +       "sdio1_cd",
> +       "sdio1_led",
> +       "sdio1_mmc",
> +       "camera_led",
> +       "camera_rgmii",
> +       "camera_sram_rgmii",
> +       "qspi_gpio",
> +       "smart_card0_fcb",
> +       "smart_card1_fcb",
> +       "gpio0_3p3",
> +       "gpio1_3p3",
> +       "gpio2_3p3",
> +};

This looks very much like function names as noted in the binding.
I would say, suffix every group with _grp or something so it's not
as confusing. Remember, spi0 is a function of the SoC,
pins {1,2} is just a group of pins that it may appear on.

> +#define CYGNUS_PIN_FUNCTION(fcn_name, mux_val)                 \
> +{                                                              \
> +       .name = #fcn_name,                                      \
> +       .group_names = cygnus_pin_group_names,                  \
> +       .num_groups = ARRAY_SIZE(cygnus_pin_group_names),       \
> +       .mux = mux_val,                                         \
> +}
> +
> +/*
> + * Cygnus has 4 alternate functions. All groups can be configured to any of
> + * the 4 alternate functions
> + */
> +static const struct cygnus_pin_function cygnus_pin_functions[] = {
> +       CYGNUS_PIN_FUNCTION(alt1, 0),
> +       CYGNUS_PIN_FUNCTION(alt2, 1),
> +       CYGNUS_PIN_FUNCTION(alt3, 2),
> +       CYGNUS_PIN_FUNCTION(alt4, 3),
> +};

These are not functions. These are per-pin mux ways.

Re-read the documentation of what a function is: it is not something
abstract like "alternative something" but something very direct like
uart0 or spi0.

> +static int cygnus_dt_node_to_map(struct pinctrl_dev *pctrl_dev,
> +               struct device_node *np, struct pinctrl_map **map,
> +               unsigned *num_maps)
> +{

After Sören Brinkmanns patches youy should be able to use core
functions for this and avoid this code altogether.

> +       num_groups = of_property_count_strings(np, "brcm,groups");

As mentioned, just "groups".

> +       ret = of_property_read_string(np, "brcm,function", &function_name);

As mentioned, just "function".

> +       ret = pinctrl_utils_reserve_map(pctrl_dev, map, &reserved_maps,
> +                       num_maps, num_groups);

Good use of utilities!

Apart from this things look nice.

The main comment to address is the definition of functions.

Yours,
Linus Walleij

Re: [PATCH 2/4] pinctrl: cygnus: add initial pinctrl support

[Linus Walleij]

On Fri, Nov 28, 2014 at 12:46 AM, Ray Jui <rjui@broadcom.com> wrote:

> This adds the initial driver support for the Broadcom Cygnus pinctrl
> controller. The Cygnus pinctrl controller supports group based
> alternate function configuration
>
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
> ---
>  drivers/pinctrl/Kconfig              |    7 +
>  drivers/pinctrl/Makefile             |    1 +
>  drivers/pinctrl/pinctrl-bcm-cygnus.c |  753 ++++++++++++++++++++++++++++++++++

With the proliferation of Broadcom drivers, please first send a
patch moving pinctrl-bcm281xx.c and pinctrl-bcm2835.c to
drivers/pinctrl/broadcom or something, so we can collect them
there.

I don't know if the hardware has any similarity though, so invite
the authors of the previous drivers to review this code.

> +config PINCTRL_BCM_CYGNUS
> +       bool "Broadcom Cygnus pinctrl driver"
> +       depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
> +       select PINMUX
> +       select PINCONF
> +       select GENERIC_PINCONF

Nice that you use GENERIC_PINCONF! :)

> +/*
> + * Cygnus pinctrl core
> + *
> + * @pctl: pointer to pinctrl_dev
> + * @dev: pointer to the device
> + * @base: I/O register base for Cygnus pinctrl configuration
> + *
> + */
> +struct cygnus_pinctrl {
> +       struct pinctrl_dev *pctl;
> +       struct device *dev;
> +       void __iomem *base;
> +
> +       const struct pinctrl_pin_desc *pins;
> +       unsigned num_pins;

Why is this not simply just a part of struct pinctrl_desc?
Why does it have to be multiplied here?

> +/*
> + * List of groups of pins
> + */
> +static const unsigned gpio0_pins[] = { 12 };
> +static const unsigned gpio1_pins[] = { 13 };
> +static const unsigned gpio2_pins[] = { 14 };
> +static const unsigned gpio3_pins[] = { 15 };
> +static const unsigned gpio4_pins[] = { 16 };
> +static const unsigned gpio5_pins[] = { 17 };
> +static const unsigned gpio6_pins[] = { 18 };
> +static const unsigned gpio7_pins[] = { 19 };
> +static const unsigned gpio8_pins[] = { 20 };
> +static const unsigned gpio9_pins[] = { 21 };
> +static const unsigned gpio10_pins[] = { 22 };
> +static const unsigned gpio11_pins[] = { 23 };
> +static const unsigned gpio12_pins[] = { 24 };
> +static const unsigned gpio13_pins[] = { 25 };
> +static const unsigned gpio14_pins[] = { 26 };
> +static const unsigned gpio15_pins[] = { 27 };
> +static const unsigned gpio16_pins[] = { 28 };
> +static const unsigned gpio17_pins[] = { 29 };
> +static const unsigned gpio18_pins[] = { 30 };
> +static const unsigned gpio19_pins[] = { 31 };
> +static const unsigned gpio20_pins[] = { 32 };
> +static const unsigned gpio21_pins[] = { 33 };
> +static const unsigned gpio22_pins[] = { 34 };
> +static const unsigned gpio23_pins[] = { 35 };

Have you considered implementing .gpio_request_enable()
and .gpio_disable_free() to get around having to have one
group for each GPIO line?

> +static const unsigned pwm0_pins[] = { 38 };
> +static const unsigned pwm1_pins[] = { 39 };
> +static const unsigned pwm2_pins[] = { 40 };
> +static const unsigned pwm3_pins[] = { 41 };
> +static const unsigned sdio0_pins[] = { 94, 95, 96, 97, 98, 99 };
> +static const unsigned smart_card0_pins[] = { 42, 43, 44, 46, 47 };
> +static const unsigned smart_card1_pins[] = { 48, 49, 50, 52, 53 };
> +static const unsigned spi0_pins[] = { 54, 55, 56, 57 };
> +static const unsigned spi1_pins[] = { 58, 59, 60, 61 };
> +static const unsigned spi2_pins[] = { 62, 63, 64, 65 };
> +static const unsigned spi3_pins[] = { 66, 67, 68, 69 };
> +static const unsigned d1w_pins[] = { 10, 11 };
> +static const unsigned lcd_pins[] = { 126, 127, 128, 129, 130, 131, 132,        133,
> +       134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147,
> +       148, 149, 150, 151, 152, 153, 154, 155 };
> +static const unsigned uart0_pins[] = { 70, 71, 72, 73 };
> +static const unsigned uart1_dte_pins[] = { 75, 76, 77, 78 };
> +static const unsigned uart1_pins[] = { 74, 79, 80, 81 };
> +static const unsigned uart3_pins[] = { 82, 83 };
> +static const unsigned qspi_pins[] = { 104, 105, 106, 107 };
> +static const unsigned nand_pins[] = { 110, 111, 112, 113, 114, 115, 116, 117,
> +       118, 119, 120, 121, 122, 123, 124, 125 };
> +static const unsigned sdio0_cd_pins[] = { 103 };
> +static const unsigned sdio0_mmc_pins[] = { 100, 101, 102 };
> +static const unsigned can0_spi4_pins[] = { 86, 87 };
> +static const unsigned can1_spi4_pins[] = { 88, 89 };
> +static const unsigned sdio1_cd_pins[] = { 93 };
> +static const unsigned sdio1_led_pins[] = { 84, 85 };
> +static const unsigned sdio1_mmc_pins[] = { 90, 91, 92 };
> +static const unsigned camera_led_pins[] = { 156, 157, 158, 159, 160 };
> +static const unsigned camera_rgmii_pins[] = { 169, 170, 171, 169, 170, 171,
> +       172, 173 };
> +static const unsigned camera_sram_rgmii_pins[] = { 161, 162, 163, 164, 165,
> +       166, 167, 168 };
> +static const unsigned qspi_gpio_pins[] = { 108, 109 };
> +static const unsigned smart_card0_fcb_pins[] = { 45 };
> +static const unsigned smart_card1_fcb_pins[] = { 51 };
> +static const unsigned gpio0_3p3_pins[] = { 176 };
> +static const unsigned gpio1_3p3_pins[] = { 177 };
> +static const unsigned gpio2_3p3_pins[] = { 178 };

Looks good...

> +/*
> + * List of groups names. Need to match the order in cygnus_pin_groups
> + */
> +static const char * const cygnus_pin_group_names[] = {
> +       "gpio0",
> +       "gpio1",
> +       "gpio2",
> +       "gpio3",
> +       "gpio4",
> +       "gpio5",
> +       "gpio6",
> +       "gpio7",
> +       "gpio8",
> +       "gpio9",
> +       "gpio10",
> +       "gpio11",
> +       "gpio12",
> +       "gpio13",
> +       "gpio14",
> +       "gpio15",
> +       "gpio16",
> +       "gpio17",
> +       "gpio18",
> +       "gpio19",
> +       "gpio20",
> +       "gpio21",
> +       "gpio22",
> +       "gpio23",
> +       "pwm0",
> +       "pwm1",
> +       "pwm2",
> +       "pwm3",
> +       "sdio0",
> +       "smart_card0",
> +       "smart_card1",
> +       "spi0",
> +       "spi1",
> +       "spi2",
> +       "spi3",
> +       "d1w",
> +       "lcd",
> +       "uart0",
> +       "uart1_dte",
> +       "uart1",
> +       "uart3",
> +       "qspi",
> +       "nand",
> +       "sdio0_cd",
> +       "sdio0_mmc",
> +       "can0_spi4",
> +       "can1_spi4",
> +       "sdio1_cd",
> +       "sdio1_led",
> +       "sdio1_mmc",
> +       "camera_led",
> +       "camera_rgmii",
> +       "camera_sram_rgmii",
> +       "qspi_gpio",
> +       "smart_card0_fcb",
> +       "smart_card1_fcb",
> +       "gpio0_3p3",
> +       "gpio1_3p3",
> +       "gpio2_3p3",
> +};

This looks very much like function names as noted in the binding.
I would say, suffix every group with _grp or something so it's not
as confusing. Remember, spi0 is a function of the SoC,
pins {1,2} is just a group of pins that it may appear on.

> +#define CYGNUS_PIN_FUNCTION(fcn_name, mux_val)                 \
> +{                                                              \
> +       .name = #fcn_name,                                      \
> +       .group_names = cygnus_pin_group_names,                  \
> +       .num_groups = ARRAY_SIZE(cygnus_pin_group_names),       \
> +       .mux = mux_val,                                         \
> +}
> +
> +/*
> + * Cygnus has 4 alternate functions. All groups can be configured to any of
> + * the 4 alternate functions
> + */
> +static const struct cygnus_pin_function cygnus_pin_functions[] = {
> +       CYGNUS_PIN_FUNCTION(alt1, 0),
> +       CYGNUS_PIN_FUNCTION(alt2, 1),
> +       CYGNUS_PIN_FUNCTION(alt3, 2),
> +       CYGNUS_PIN_FUNCTION(alt4, 3),
> +};

These are not functions. These are per-pin mux ways.

Re-read the documentation of what a function is: it is not something
abstract like "alternative something" but something very direct like
uart0 or spi0.

> +static int cygnus_dt_node_to_map(struct pinctrl_dev *pctrl_dev,
> +               struct device_node *np, struct pinctrl_map **map,
> +               unsigned *num_maps)
> +{

After Sören Brinkmanns patches youy should be able to use core
functions for this and avoid this code altogether.

> +       num_groups = of_property_count_strings(np, "brcm,groups");

As mentioned, just "groups".

> +       ret = of_property_read_string(np, "brcm,function", &function_name);

As mentioned, just "function".

> +       ret = pinctrl_utils_reserve_map(pctrl_dev, map, &reserved_maps,
> +                       num_maps, num_groups);

Good use of utilities!

Apart from this things look nice.

The main comment to address is the definition of functions.

Yours,
Linus Walleij

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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

[PATCH 2/4] pinctrl: cygnus: add initial pinctrl support

[Linus Walleij]

On Fri, Nov 28, 2014 at 12:46 AM, Ray Jui <rjui@broadcom.com> wrote:

> This adds the initial driver support for the Broadcom Cygnus pinctrl
> controller. The Cygnus pinctrl controller supports group based
> alternate function configuration
>
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
> ---
>  drivers/pinctrl/Kconfig              |    7 +
>  drivers/pinctrl/Makefile             |    1 +
>  drivers/pinctrl/pinctrl-bcm-cygnus.c |  753 ++++++++++++++++++++++++++++++++++

With the proliferation of Broadcom drivers, please first send a
patch moving pinctrl-bcm281xx.c and pinctrl-bcm2835.c to
drivers/pinctrl/broadcom or something, so we can collect them
there.

I don't know if the hardware has any similarity though, so invite
the authors of the previous drivers to review this code.

> +config PINCTRL_BCM_CYGNUS
> +       bool "Broadcom Cygnus pinctrl driver"
> +       depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
> +       select PINMUX
> +       select PINCONF
> +       select GENERIC_PINCONF

Nice that you use GENERIC_PINCONF! :)

> +/*
> + * Cygnus pinctrl core
> + *
> + * @pctl: pointer to pinctrl_dev
> + * @dev: pointer to the device
> + * @base: I/O register base for Cygnus pinctrl configuration
> + *
> + */
> +struct cygnus_pinctrl {
> +       struct pinctrl_dev *pctl;
> +       struct device *dev;
> +       void __iomem *base;
> +
> +       const struct pinctrl_pin_desc *pins;
> +       unsigned num_pins;

Why is this not simply just a part of struct pinctrl_desc?
Why does it have to be multiplied here?

> +/*
> + * List of groups of pins
> + */
> +static const unsigned gpio0_pins[] = { 12 };
> +static const unsigned gpio1_pins[] = { 13 };
> +static const unsigned gpio2_pins[] = { 14 };
> +static const unsigned gpio3_pins[] = { 15 };
> +static const unsigned gpio4_pins[] = { 16 };
> +static const unsigned gpio5_pins[] = { 17 };
> +static const unsigned gpio6_pins[] = { 18 };
> +static const unsigned gpio7_pins[] = { 19 };
> +static const unsigned gpio8_pins[] = { 20 };
> +static const unsigned gpio9_pins[] = { 21 };
> +static const unsigned gpio10_pins[] = { 22 };
> +static const unsigned gpio11_pins[] = { 23 };
> +static const unsigned gpio12_pins[] = { 24 };
> +static const unsigned gpio13_pins[] = { 25 };
> +static const unsigned gpio14_pins[] = { 26 };
> +static const unsigned gpio15_pins[] = { 27 };
> +static const unsigned gpio16_pins[] = { 28 };
> +static const unsigned gpio17_pins[] = { 29 };
> +static const unsigned gpio18_pins[] = { 30 };
> +static const unsigned gpio19_pins[] = { 31 };
> +static const unsigned gpio20_pins[] = { 32 };
> +static const unsigned gpio21_pins[] = { 33 };
> +static const unsigned gpio22_pins[] = { 34 };
> +static const unsigned gpio23_pins[] = { 35 };

Have you considered implementing .gpio_request_enable()
and .gpio_disable_free() to get around having to have one
group for each GPIO line?

> +static const unsigned pwm0_pins[] = { 38 };
> +static const unsigned pwm1_pins[] = { 39 };
> +static const unsigned pwm2_pins[] = { 40 };
> +static const unsigned pwm3_pins[] = { 41 };
> +static const unsigned sdio0_pins[] = { 94, 95, 96, 97, 98, 99 };
> +static const unsigned smart_card0_pins[] = { 42, 43, 44, 46, 47 };
> +static const unsigned smart_card1_pins[] = { 48, 49, 50, 52, 53 };
> +static const unsigned spi0_pins[] = { 54, 55, 56, 57 };
> +static const unsigned spi1_pins[] = { 58, 59, 60, 61 };
> +static const unsigned spi2_pins[] = { 62, 63, 64, 65 };
> +static const unsigned spi3_pins[] = { 66, 67, 68, 69 };
> +static const unsigned d1w_pins[] = { 10, 11 };
> +static const unsigned lcd_pins[] = { 126, 127, 128, 129, 130, 131, 132,        133,
> +       134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147,
> +       148, 149, 150, 151, 152, 153, 154, 155 };
> +static const unsigned uart0_pins[] = { 70, 71, 72, 73 };
> +static const unsigned uart1_dte_pins[] = { 75, 76, 77, 78 };
> +static const unsigned uart1_pins[] = { 74, 79, 80, 81 };
> +static const unsigned uart3_pins[] = { 82, 83 };
> +static const unsigned qspi_pins[] = { 104, 105, 106, 107 };
> +static const unsigned nand_pins[] = { 110, 111, 112, 113, 114, 115, 116, 117,
> +       118, 119, 120, 121, 122, 123, 124, 125 };
> +static const unsigned sdio0_cd_pins[] = { 103 };
> +static const unsigned sdio0_mmc_pins[] = { 100, 101, 102 };
> +static const unsigned can0_spi4_pins[] = { 86, 87 };
> +static const unsigned can1_spi4_pins[] = { 88, 89 };
> +static const unsigned sdio1_cd_pins[] = { 93 };
> +static const unsigned sdio1_led_pins[] = { 84, 85 };
> +static const unsigned sdio1_mmc_pins[] = { 90, 91, 92 };
> +static const unsigned camera_led_pins[] = { 156, 157, 158, 159, 160 };
> +static const unsigned camera_rgmii_pins[] = { 169, 170, 171, 169, 170, 171,
> +       172, 173 };
> +static const unsigned camera_sram_rgmii_pins[] = { 161, 162, 163, 164, 165,
> +       166, 167, 168 };
> +static const unsigned qspi_gpio_pins[] = { 108, 109 };
> +static const unsigned smart_card0_fcb_pins[] = { 45 };
> +static const unsigned smart_card1_fcb_pins[] = { 51 };
> +static const unsigned gpio0_3p3_pins[] = { 176 };
> +static const unsigned gpio1_3p3_pins[] = { 177 };
> +static const unsigned gpio2_3p3_pins[] = { 178 };

Looks good...

> +/*
> + * List of groups names. Need to match the order in cygnus_pin_groups
> + */
> +static const char * const cygnus_pin_group_names[] = {
> +       "gpio0",
> +       "gpio1",
> +       "gpio2",
> +       "gpio3",
> +       "gpio4",
> +       "gpio5",
> +       "gpio6",
> +       "gpio7",
> +       "gpio8",
> +       "gpio9",
> +       "gpio10",
> +       "gpio11",
> +       "gpio12",
> +       "gpio13",
> +       "gpio14",
> +       "gpio15",
> +       "gpio16",
> +       "gpio17",
> +       "gpio18",
> +       "gpio19",
> +       "gpio20",
> +       "gpio21",
> +       "gpio22",
> +       "gpio23",
> +       "pwm0",
> +       "pwm1",
> +       "pwm2",
> +       "pwm3",
> +       "sdio0",
> +       "smart_card0",
> +       "smart_card1",
> +       "spi0",
> +       "spi1",
> +       "spi2",
> +       "spi3",
> +       "d1w",
> +       "lcd",
> +       "uart0",
> +       "uart1_dte",
> +       "uart1",
> +       "uart3",
> +       "qspi",
> +       "nand",
> +       "sdio0_cd",
> +       "sdio0_mmc",
> +       "can0_spi4",
> +       "can1_spi4",
> +       "sdio1_cd",
> +       "sdio1_led",
> +       "sdio1_mmc",
> +       "camera_led",
> +       "camera_rgmii",
> +       "camera_sram_rgmii",
> +       "qspi_gpio",
> +       "smart_card0_fcb",
> +       "smart_card1_fcb",
> +       "gpio0_3p3",
> +       "gpio1_3p3",
> +       "gpio2_3p3",
> +};

This looks very much like function names as noted in the binding.
I would say, suffix every group with _grp or something so it's not
as confusing. Remember, spi0 is a function of the SoC,
pins {1,2} is just a group of pins that it may appear on.

> +#define CYGNUS_PIN_FUNCTION(fcn_name, mux_val)                 \
> +{                                                              \
> +       .name = #fcn_name,                                      \
> +       .group_names = cygnus_pin_group_names,                  \
> +       .num_groups = ARRAY_SIZE(cygnus_pin_group_names),       \
> +       .mux = mux_val,                                         \
> +}
> +
> +/*
> + * Cygnus has 4 alternate functions. All groups can be configured to any of
> + * the 4 alternate functions
> + */
> +static const struct cygnus_pin_function cygnus_pin_functions[] = {
> +       CYGNUS_PIN_FUNCTION(alt1, 0),
> +       CYGNUS_PIN_FUNCTION(alt2, 1),
> +       CYGNUS_PIN_FUNCTION(alt3, 2),
> +       CYGNUS_PIN_FUNCTION(alt4, 3),
> +};

These are not functions. These are per-pin mux ways.

Re-read the documentation of what a function is: it is not something
abstract like "alternative something" but something very direct like
uart0 or spi0.

> +static int cygnus_dt_node_to_map(struct pinctrl_dev *pctrl_dev,
> +               struct device_node *np, struct pinctrl_map **map,
> +               unsigned *num_maps)
> +{

After S?ren Brinkmanns patches youy should be able to use core
functions for this and avoid this code altogether.

> +       num_groups = of_property_count_strings(np, "brcm,groups");

As mentioned, just "groups".

> +       ret = of_property_read_string(np, "brcm,function", &function_name);

As mentioned, just "function".

> +       ret = pinctrl_utils_reserve_map(pctrl_dev, map, &reserved_maps,
> +                       num_maps, num_groups);

Good use of utilities!

Apart from this things look nice.

The main comment to address is the definition of functions.

Yours,
Linus Walleij

Re: [PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Ray Jui]

On 1/9/2015 2:12 AM, Linus Walleij wrote:
> On Fri, Nov 28, 2014 at 12:46 AM, Ray Jui <rjui@broadcom.com> wrote:
> 
>> Device tree binding documentation for Broadcom Cygnus pinctrl driver
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>> ---
>>  .../bindings/pinctrl/brcm,cygnus-pinctrl.txt       |   92 ++++++++++++++++++++
>>  1 file changed, 92 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
>>
>> diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
>> new file mode 100644
>> index 0000000..86e4579
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
>> @@ -0,0 +1,92 @@
>> +Broadcom Cygnus Pin Controller
>> +
>> +The Cygnus pin controller supports setting the alternate functions of groups
>> +of pins. Pinmux configuration on individual pins is not supported by the
>> +Cygnus A0 SoC.
>> +
>> +Required properties:
>> +
>> +- compatible:
>> +    Must be "brcm,cygnus-pinctrl"
>> +
>> +- reg:
>> +    Define the base and range of the I/O address space that contain the Cygnus
>> +pin control registers
> 
> The following is subnodes. Indicate clearly in the binding that these are
> *not* properties of the main node, but individual subnodes.
> 
Right. I'll fix the document.

>> +- brcm,groups:
>> +    This can be strings of one or more group names. This defines the group(s)
>> +that one wants to configure
>> +
>> +- brcm,function:
>> +    This is the alternate function that one wants to configure to. Valid
>> +alternate functions are "alt1", "alt2", "alt3", "alt4"
> 
> NAK. We have standardized bindings for groups and functions,
> and there are pending patches from Sören Brinkmann adding
> this to the pinctrl DT parsing core.
> 
> Just use "groups" and "function" and refer to
> Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
> 
> Then "alt1", "alt2" etc are non-functional names of functions.
> Use the real function names, like "spi0" or so. This
> alt-business seems to be just a shortcut to make it
> simple, don't do that.
> 
> Then you use e.g. "spi0" as a group name. I prefer you
> call that "spi0_grp" or something to say it is a group of
> pins associated with spi0, as spi0 is actually the
> function.
> 
Hmmm, I did this by following brcm,bcm11351-pinctrl.txt:
- function: String. Specifies the pin mux selection. Values must be one
of: "alt1", "alt2", "alt3", "alt4"

But you are right, in the pinctrl binding document it describes the
generic pin multiplexing nodes use "function" and "group".

Let me try to explain how the Cygnus pinctrl controller works and maybe
you can help to comment whether or not it's suitable for what's
described in pinctrl-binding.txt for the usage of "function" and "group".

The Cygnus pinctrl contoller has a limitation that the mux configuration
can only be group based. "group" here is a real configuration in the
Cygnus pinctrl controller registers. One can configure a "group" to
alternate function 1, 2, 3, or 4.

For example, the group "lcd" covers 30 pins. When I configure "lcd" to
alternate function 1, all 30 pins are muxed to LCD function. When
configured to function 2, all pins are muxed to SRAM function. Now, here
comes the issue, when configured to function 3, pins 1-15 and 20-30
become GPIO function, but pins 16-19 becomes SPI5 function. When it's
configured to function 4, all 30 pins become GPIO.

In some other cases, when I configure a group to other functions, there
could be spare pins which become unused (not brought out to the pad).
Or, the spare pins may also become a separate function.

Based on the LCD example, I'd assume I would do the following for the
default LCD function:

lcd_node {
	group = "lcd_grp";
	function = "lcd";
};

And in the case of function 3, I would call the function "spi5" and
assume the rest of pins become either GPIO (or unused)?

spi5_node {
	group = "lcd_grp";
	function = "spi5";
};


> If unsure of the definitions of group and function, refer
> to Documentation/pinctrl.txt
> 
> Yours,
> Linus Walleij
> 

Re: [PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Ray Jui]

On 1/9/2015 2:12 AM, Linus Walleij wrote:
> On Fri, Nov 28, 2014 at 12:46 AM, Ray Jui <rjui@broadcom.com> wrote:
> 
>> Device tree binding documentation for Broadcom Cygnus pinctrl driver
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>> ---
>>  .../bindings/pinctrl/brcm,cygnus-pinctrl.txt       |   92 ++++++++++++++++++++
>>  1 file changed, 92 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
>>
>> diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
>> new file mode 100644
>> index 0000000..86e4579
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
>> @@ -0,0 +1,92 @@
>> +Broadcom Cygnus Pin Controller
>> +
>> +The Cygnus pin controller supports setting the alternate functions of groups
>> +of pins. Pinmux configuration on individual pins is not supported by the
>> +Cygnus A0 SoC.
>> +
>> +Required properties:
>> +
>> +- compatible:
>> +    Must be "brcm,cygnus-pinctrl"
>> +
>> +- reg:
>> +    Define the base and range of the I/O address space that contain the Cygnus
>> +pin control registers
> 
> The following is subnodes. Indicate clearly in the binding that these are
> *not* properties of the main node, but individual subnodes.
> 
Right. I'll fix the document.

>> +- brcm,groups:
>> +    This can be strings of one or more group names. This defines the group(s)
>> +that one wants to configure
>> +
>> +- brcm,function:
>> +    This is the alternate function that one wants to configure to. Valid
>> +alternate functions are "alt1", "alt2", "alt3", "alt4"
> 
> NAK. We have standardized bindings for groups and functions,
> and there are pending patches from Sören Brinkmann adding
> this to the pinctrl DT parsing core.
> 
> Just use "groups" and "function" and refer to
> Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
> 
> Then "alt1", "alt2" etc are non-functional names of functions.
> Use the real function names, like "spi0" or so. This
> alt-business seems to be just a shortcut to make it
> simple, don't do that.
> 
> Then you use e.g. "spi0" as a group name. I prefer you
> call that "spi0_grp" or something to say it is a group of
> pins associated with spi0, as spi0 is actually the
> function.
> 
Hmmm, I did this by following brcm,bcm11351-pinctrl.txt:
- function: String. Specifies the pin mux selection. Values must be one
of: "alt1", "alt2", "alt3", "alt4"

But you are right, in the pinctrl binding document it describes the
generic pin multiplexing nodes use "function" and "group".

Let me try to explain how the Cygnus pinctrl controller works and maybe
you can help to comment whether or not it's suitable for what's
described in pinctrl-binding.txt for the usage of "function" and "group".

The Cygnus pinctrl contoller has a limitation that the mux configuration
can only be group based. "group" here is a real configuration in the
Cygnus pinctrl controller registers. One can configure a "group" to
alternate function 1, 2, 3, or 4.

For example, the group "lcd" covers 30 pins. When I configure "lcd" to
alternate function 1, all 30 pins are muxed to LCD function. When
configured to function 2, all pins are muxed to SRAM function. Now, here
comes the issue, when configured to function 3, pins 1-15 and 20-30
become GPIO function, but pins 16-19 becomes SPI5 function. When it's
configured to function 4, all 30 pins become GPIO.

In some other cases, when I configure a group to other functions, there
could be spare pins which become unused (not brought out to the pad).
Or, the spare pins may also become a separate function.

Based on the LCD example, I'd assume I would do the following for the
default LCD function:

lcd_node {
	group = "lcd_grp";
	function = "lcd";
};

And in the case of function 3, I would call the function "spi5" and
assume the rest of pins become either GPIO (or unused)?

spi5_node {
	group = "lcd_grp";
	function = "spi5";
};


> If unsure of the definitions of group and function, refer
> to Documentation/pinctrl.txt
> 
> Yours,
> Linus Walleij
> 

[PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Ray Jui]

On 1/9/2015 2:12 AM, Linus Walleij wrote:
> On Fri, Nov 28, 2014 at 12:46 AM, Ray Jui <rjui@broadcom.com> wrote:
> 
>> Device tree binding documentation for Broadcom Cygnus pinctrl driver
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>> ---
>>  .../bindings/pinctrl/brcm,cygnus-pinctrl.txt       |   92 ++++++++++++++++++++
>>  1 file changed, 92 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
>>
>> diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
>> new file mode 100644
>> index 0000000..86e4579
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinctrl.txt
>> @@ -0,0 +1,92 @@
>> +Broadcom Cygnus Pin Controller
>> +
>> +The Cygnus pin controller supports setting the alternate functions of groups
>> +of pins. Pinmux configuration on individual pins is not supported by the
>> +Cygnus A0 SoC.
>> +
>> +Required properties:
>> +
>> +- compatible:
>> +    Must be "brcm,cygnus-pinctrl"
>> +
>> +- reg:
>> +    Define the base and range of the I/O address space that contain the Cygnus
>> +pin control registers
> 
> The following is subnodes. Indicate clearly in the binding that these are
> *not* properties of the main node, but individual subnodes.
> 
Right. I'll fix the document.

>> +- brcm,groups:
>> +    This can be strings of one or more group names. This defines the group(s)
>> +that one wants to configure
>> +
>> +- brcm,function:
>> +    This is the alternate function that one wants to configure to. Valid
>> +alternate functions are "alt1", "alt2", "alt3", "alt4"
> 
> NAK. We have standardized bindings for groups and functions,
> and there are pending patches from S?ren Brinkmann adding
> this to the pinctrl DT parsing core.
> 
> Just use "groups" and "function" and refer to
> Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
> 
> Then "alt1", "alt2" etc are non-functional names of functions.
> Use the real function names, like "spi0" or so. This
> alt-business seems to be just a shortcut to make it
> simple, don't do that.
> 
> Then you use e.g. "spi0" as a group name. I prefer you
> call that "spi0_grp" or something to say it is a group of
> pins associated with spi0, as spi0 is actually the
> function.
> 
Hmmm, I did this by following brcm,bcm11351-pinctrl.txt:
- function: String. Specifies the pin mux selection. Values must be one
of: "alt1", "alt2", "alt3", "alt4"

But you are right, in the pinctrl binding document it describes the
generic pin multiplexing nodes use "function" and "group".

Let me try to explain how the Cygnus pinctrl controller works and maybe
you can help to comment whether or not it's suitable for what's
described in pinctrl-binding.txt for the usage of "function" and "group".

The Cygnus pinctrl contoller has a limitation that the mux configuration
can only be group based. "group" here is a real configuration in the
Cygnus pinctrl controller registers. One can configure a "group" to
alternate function 1, 2, 3, or 4.

For example, the group "lcd" covers 30 pins. When I configure "lcd" to
alternate function 1, all 30 pins are muxed to LCD function. When
configured to function 2, all pins are muxed to SRAM function. Now, here
comes the issue, when configured to function 3, pins 1-15 and 20-30
become GPIO function, but pins 16-19 becomes SPI5 function. When it's
configured to function 4, all 30 pins become GPIO.

In some other cases, when I configure a group to other functions, there
could be spare pins which become unused (not brought out to the pad).
Or, the spare pins may also become a separate function.

Based on the LCD example, I'd assume I would do the following for the
default LCD function:

lcd_node {
	group = "lcd_grp";
	function = "lcd";
};

And in the case of function 3, I would call the function "spi5" and
assume the rest of pins become either GPIO (or unused)?

spi5_node {
	group = "lcd_grp";
	function = "spi5";
};


> If unsure of the definitions of group and function, refer
> to Documentation/pinctrl.txt
> 
> Yours,
> Linus Walleij
> 

Re: [PATCH 2/4] pinctrl: cygnus: add initial pinctrl support

[Ray Jui]

On 1/9/2015 3:03 AM, Linus Walleij wrote:
> On Fri, Nov 28, 2014 at 12:46 AM, Ray Jui <rjui@broadcom.com> wrote:
> 
>> This adds the initial driver support for the Broadcom Cygnus pinctrl
>> controller. The Cygnus pinctrl controller supports group based
>> alternate function configuration
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>> Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
>> ---
>>  drivers/pinctrl/Kconfig              |    7 +
>>  drivers/pinctrl/Makefile             |    1 +
>>  drivers/pinctrl/pinctrl-bcm-cygnus.c |  753 ++++++++++++++++++++++++++++++++++
> 
> With the proliferation of Broadcom drivers, please first send a
> patch moving pinctrl-bcm281xx.c and pinctrl-bcm2835.c to
> drivers/pinctrl/broadcom or something, so we can collect them
> there.
> 
Okay. This change will be included as the first patch in the next patch set.

> I don't know if the hardware has any similarity though, so invite
> the authors of the previous drivers to review this code.
> 
They are completely different. The only similarity between Cygnus and
bcm281xx pinctrl is that they use the same concept of alternation
functions (1, 2, 3, 4) for mux configuration.

>> +config PINCTRL_BCM_CYGNUS
>> +       bool "Broadcom Cygnus pinctrl driver"
>> +       depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
>> +       select PINMUX
>> +       select PINCONF
>> +       select GENERIC_PINCONF
> 
> Nice that you use GENERIC_PINCONF! :)
> 
>> +/*
>> + * Cygnus pinctrl core
>> + *
>> + * @pctl: pointer to pinctrl_dev
>> + * @dev: pointer to the device
>> + * @base: I/O register base for Cygnus pinctrl configuration
>> + *
>> + */
>> +struct cygnus_pinctrl {
>> +       struct pinctrl_dev *pctl;
>> +       struct device *dev;
>> +       void __iomem *base;
>> +
>> +       const struct pinctrl_pin_desc *pins;
>> +       unsigned num_pins;
> 
> Why is this not simply just a part of struct pinctrl_desc?
> Why does it have to be multiplied here?
> 
Okay. Let me look into this.

>> +/*
>> + * List of groups of pins
>> + */
>> +static const unsigned gpio0_pins[] = { 12 };
>> +static const unsigned gpio1_pins[] = { 13 };
>> +static const unsigned gpio2_pins[] = { 14 };
>> +static const unsigned gpio3_pins[] = { 15 };
>> +static const unsigned gpio4_pins[] = { 16 };
>> +static const unsigned gpio5_pins[] = { 17 };
>> +static const unsigned gpio6_pins[] = { 18 };
>> +static const unsigned gpio7_pins[] = { 19 };
>> +static const unsigned gpio8_pins[] = { 20 };
>> +static const unsigned gpio9_pins[] = { 21 };
>> +static const unsigned gpio10_pins[] = { 22 };
>> +static const unsigned gpio11_pins[] = { 23 };
>> +static const unsigned gpio12_pins[] = { 24 };
>> +static const unsigned gpio13_pins[] = { 25 };
>> +static const unsigned gpio14_pins[] = { 26 };
>> +static const unsigned gpio15_pins[] = { 27 };
>> +static const unsigned gpio16_pins[] = { 28 };
>> +static const unsigned gpio17_pins[] = { 29 };
>> +static const unsigned gpio18_pins[] = { 30 };
>> +static const unsigned gpio19_pins[] = { 31 };
>> +static const unsigned gpio20_pins[] = { 32 };
>> +static const unsigned gpio21_pins[] = { 33 };
>> +static const unsigned gpio22_pins[] = { 34 };
>> +static const unsigned gpio23_pins[] = { 35 };
> 
> Have you considered implementing .gpio_request_enable()
> and .gpio_disable_free() to get around having to have one
> group for each GPIO line?
> 
Okay the Cygnus pin controller is really a mess. GPIO 0 ~ GPIO23 are
really 23 distinct groups, each with one pin. Then the rest of GPIOs go
under other groups. In general, when we set a group to alternate
function 4, all pins become GPIO.

>> +static const unsigned pwm0_pins[] = { 38 };
>> +static const unsigned pwm1_pins[] = { 39 };
>> +static const unsigned pwm2_pins[] = { 40 };
>> +static const unsigned pwm3_pins[] = { 41 };
>> +static const unsigned sdio0_pins[] = { 94, 95, 96, 97, 98, 99 };
>> +static const unsigned smart_card0_pins[] = { 42, 43, 44, 46, 47 };
>> +static const unsigned smart_card1_pins[] = { 48, 49, 50, 52, 53 };
>> +static const unsigned spi0_pins[] = { 54, 55, 56, 57 };
>> +static const unsigned spi1_pins[] = { 58, 59, 60, 61 };
>> +static const unsigned spi2_pins[] = { 62, 63, 64, 65 };
>> +static const unsigned spi3_pins[] = { 66, 67, 68, 69 };
>> +static const unsigned d1w_pins[] = { 10, 11 };
>> +static const unsigned lcd_pins[] = { 126, 127, 128, 129, 130, 131, 132,        133,
>> +       134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147,
>> +       148, 149, 150, 151, 152, 153, 154, 155 };
>> +static const unsigned uart0_pins[] = { 70, 71, 72, 73 };
>> +static const unsigned uart1_dte_pins[] = { 75, 76, 77, 78 };
>> +static const unsigned uart1_pins[] = { 74, 79, 80, 81 };
>> +static const unsigned uart3_pins[] = { 82, 83 };
>> +static const unsigned qspi_pins[] = { 104, 105, 106, 107 };
>> +static const unsigned nand_pins[] = { 110, 111, 112, 113, 114, 115, 116, 117,
>> +       118, 119, 120, 121, 122, 123, 124, 125 };
>> +static const unsigned sdio0_cd_pins[] = { 103 };
>> +static const unsigned sdio0_mmc_pins[] = { 100, 101, 102 };
>> +static const unsigned can0_spi4_pins[] = { 86, 87 };
>> +static const unsigned can1_spi4_pins[] = { 88, 89 };
>> +static const unsigned sdio1_cd_pins[] = { 93 };
>> +static const unsigned sdio1_led_pins[] = { 84, 85 };
>> +static const unsigned sdio1_mmc_pins[] = { 90, 91, 92 };
>> +static const unsigned camera_led_pins[] = { 156, 157, 158, 159, 160 };
>> +static const unsigned camera_rgmii_pins[] = { 169, 170, 171, 169, 170, 171,
>> +       172, 173 };
>> +static const unsigned camera_sram_rgmii_pins[] = { 161, 162, 163, 164, 165,
>> +       166, 167, 168 };
>> +static const unsigned qspi_gpio_pins[] = { 108, 109 };
>> +static const unsigned smart_card0_fcb_pins[] = { 45 };
>> +static const unsigned smart_card1_fcb_pins[] = { 51 };
>> +static const unsigned gpio0_3p3_pins[] = { 176 };
>> +static const unsigned gpio1_3p3_pins[] = { 177 };
>> +static const unsigned gpio2_3p3_pins[] = { 178 };
> 
> Looks good...
> 
Note these pins are definitions in the driver that help to describe the
pad layout. We can't really configure any individual pins in Cygnus.

>> +/*
>> + * List of groups names. Need to match the order in cygnus_pin_groups
>> + */
>> +static const char * const cygnus_pin_group_names[] = {
>> +       "gpio0",
>> +       "gpio1",
>> +       "gpio2",
>> +       "gpio3",
>> +       "gpio4",
>> +       "gpio5",
>> +       "gpio6",
>> +       "gpio7",
>> +       "gpio8",
>> +       "gpio9",
>> +       "gpio10",
>> +       "gpio11",
>> +       "gpio12",
>> +       "gpio13",
>> +       "gpio14",
>> +       "gpio15",
>> +       "gpio16",
>> +       "gpio17",
>> +       "gpio18",
>> +       "gpio19",
>> +       "gpio20",
>> +       "gpio21",
>> +       "gpio22",
>> +       "gpio23",
>> +       "pwm0",
>> +       "pwm1",
>> +       "pwm2",
>> +       "pwm3",
>> +       "sdio0",
>> +       "smart_card0",
>> +       "smart_card1",
>> +       "spi0",
>> +       "spi1",
>> +       "spi2",
>> +       "spi3",
>> +       "d1w",
>> +       "lcd",
>> +       "uart0",
>> +       "uart1_dte",
>> +       "uart1",
>> +       "uart3",
>> +       "qspi",
>> +       "nand",
>> +       "sdio0_cd",
>> +       "sdio0_mmc",
>> +       "can0_spi4",
>> +       "can1_spi4",
>> +       "sdio1_cd",
>> +       "sdio1_led",
>> +       "sdio1_mmc",
>> +       "camera_led",
>> +       "camera_rgmii",
>> +       "camera_sram_rgmii",
>> +       "qspi_gpio",
>> +       "smart_card0_fcb",
>> +       "smart_card1_fcb",
>> +       "gpio0_3p3",
>> +       "gpio1_3p3",
>> +       "gpio2_3p3",
>> +};
> 
> This looks very much like function names as noted in the binding.
> I would say, suffix every group with _grp or something so it's not
> as confusing. Remember, spi0 is a function of the SoC,
> pins {1,2} is just a group of pins that it may appear on.
> 
Yes, suffix every group with _grp helps a lot to clarify the confusion.
Will fix this.

>> +#define CYGNUS_PIN_FUNCTION(fcn_name, mux_val)                 \
>> +{                                                              \
>> +       .name = #fcn_name,                                      \
>> +       .group_names = cygnus_pin_group_names,                  \
>> +       .num_groups = ARRAY_SIZE(cygnus_pin_group_names),       \
>> +       .mux = mux_val,                                         \
>> +}
>> +
>> +/*
>> + * Cygnus has 4 alternate functions. All groups can be configured to any of
>> + * the 4 alternate functions
>> + */
>> +static const struct cygnus_pin_function cygnus_pin_functions[] = {
>> +       CYGNUS_PIN_FUNCTION(alt1, 0),
>> +       CYGNUS_PIN_FUNCTION(alt2, 1),
>> +       CYGNUS_PIN_FUNCTION(alt3, 2),
>> +       CYGNUS_PIN_FUNCTION(alt4, 3),
>> +};
> 
> These are not functions. These are per-pin mux ways.
> 
> Re-read the documentation of what a function is: it is not something
> abstract like "alternative something" but something very direct like
> uart0 or spi0.
> 
Yes, agree. Will fix.

>> +static int cygnus_dt_node_to_map(struct pinctrl_dev *pctrl_dev,
>> +               struct device_node *np, struct pinctrl_map **map,
>> +               unsigned *num_maps)
>> +{
> 
> After Sören Brinkmanns patches youy should be able to use core
> functions for this and avoid this code altogether.
> 

Will that help to take care our case, based on the way we will use
"function" and "group"?

>> +       num_groups = of_property_count_strings(np, "brcm,groups");
> 
> As mentioned, just "groups".
> 
I guess I will use "group"?

>> +       ret = of_property_read_string(np, "brcm,function", &function_name);
> 
> As mentioned, just "function".
> 
Yes.

>> +       ret = pinctrl_utils_reserve_map(pctrl_dev, map, &reserved_maps,
>> +                       num_maps, num_groups);
> 
> Good use of utilities!
> 
> Apart from this things look nice.
> 
> The main comment to address is the definition of functions.
> 
> Yours,
> Linus Walleij
> 
Thanks a lot for the review!!!

Re: [PATCH 2/4] pinctrl: cygnus: add initial pinctrl support

[Ray Jui]

On 1/9/2015 3:03 AM, Linus Walleij wrote:
> On Fri, Nov 28, 2014 at 12:46 AM, Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org> wrote:
> 
>> This adds the initial driver support for the Broadcom Cygnus pinctrl
>> controller. The Cygnus pinctrl controller supports group based
>> alternate function configuration
>>
>> Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>> Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>> Signed-off-by: Fengguang Wu <fengguang.wu-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
>> ---
>>  drivers/pinctrl/Kconfig              |    7 +
>>  drivers/pinctrl/Makefile             |    1 +
>>  drivers/pinctrl/pinctrl-bcm-cygnus.c |  753 ++++++++++++++++++++++++++++++++++
> 
> With the proliferation of Broadcom drivers, please first send a
> patch moving pinctrl-bcm281xx.c and pinctrl-bcm2835.c to
> drivers/pinctrl/broadcom or something, so we can collect them
> there.
> 
Okay. This change will be included as the first patch in the next patch set.

> I don't know if the hardware has any similarity though, so invite
> the authors of the previous drivers to review this code.
> 
They are completely different. The only similarity between Cygnus and
bcm281xx pinctrl is that they use the same concept of alternation
functions (1, 2, 3, 4) for mux configuration.

>> +config PINCTRL_BCM_CYGNUS
>> +       bool "Broadcom Cygnus pinctrl driver"
>> +       depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
>> +       select PINMUX
>> +       select PINCONF
>> +       select GENERIC_PINCONF
> 
> Nice that you use GENERIC_PINCONF! :)
> 
>> +/*
>> + * Cygnus pinctrl core
>> + *
>> + * @pctl: pointer to pinctrl_dev
>> + * @dev: pointer to the device
>> + * @base: I/O register base for Cygnus pinctrl configuration
>> + *
>> + */
>> +struct cygnus_pinctrl {
>> +       struct pinctrl_dev *pctl;
>> +       struct device *dev;
>> +       void __iomem *base;
>> +
>> +       const struct pinctrl_pin_desc *pins;
>> +       unsigned num_pins;
> 
> Why is this not simply just a part of struct pinctrl_desc?
> Why does it have to be multiplied here?
> 
Okay. Let me look into this.

>> +/*
>> + * List of groups of pins
>> + */
>> +static const unsigned gpio0_pins[] = { 12 };
>> +static const unsigned gpio1_pins[] = { 13 };
>> +static const unsigned gpio2_pins[] = { 14 };
>> +static const unsigned gpio3_pins[] = { 15 };
>> +static const unsigned gpio4_pins[] = { 16 };
>> +static const unsigned gpio5_pins[] = { 17 };
>> +static const unsigned gpio6_pins[] = { 18 };
>> +static const unsigned gpio7_pins[] = { 19 };
>> +static const unsigned gpio8_pins[] = { 20 };
>> +static const unsigned gpio9_pins[] = { 21 };
>> +static const unsigned gpio10_pins[] = { 22 };
>> +static const unsigned gpio11_pins[] = { 23 };
>> +static const unsigned gpio12_pins[] = { 24 };
>> +static const unsigned gpio13_pins[] = { 25 };
>> +static const unsigned gpio14_pins[] = { 26 };
>> +static const unsigned gpio15_pins[] = { 27 };
>> +static const unsigned gpio16_pins[] = { 28 };
>> +static const unsigned gpio17_pins[] = { 29 };
>> +static const unsigned gpio18_pins[] = { 30 };
>> +static const unsigned gpio19_pins[] = { 31 };
>> +static const unsigned gpio20_pins[] = { 32 };
>> +static const unsigned gpio21_pins[] = { 33 };
>> +static const unsigned gpio22_pins[] = { 34 };
>> +static const unsigned gpio23_pins[] = { 35 };
> 
> Have you considered implementing .gpio_request_enable()
> and .gpio_disable_free() to get around having to have one
> group for each GPIO line?
> 
Okay the Cygnus pin controller is really a mess. GPIO 0 ~ GPIO23 are
really 23 distinct groups, each with one pin. Then the rest of GPIOs go
under other groups. In general, when we set a group to alternate
function 4, all pins become GPIO.

>> +static const unsigned pwm0_pins[] = { 38 };
>> +static const unsigned pwm1_pins[] = { 39 };
>> +static const unsigned pwm2_pins[] = { 40 };
>> +static const unsigned pwm3_pins[] = { 41 };
>> +static const unsigned sdio0_pins[] = { 94, 95, 96, 97, 98, 99 };
>> +static const unsigned smart_card0_pins[] = { 42, 43, 44, 46, 47 };
>> +static const unsigned smart_card1_pins[] = { 48, 49, 50, 52, 53 };
>> +static const unsigned spi0_pins[] = { 54, 55, 56, 57 };
>> +static const unsigned spi1_pins[] = { 58, 59, 60, 61 };
>> +static const unsigned spi2_pins[] = { 62, 63, 64, 65 };
>> +static const unsigned spi3_pins[] = { 66, 67, 68, 69 };
>> +static const unsigned d1w_pins[] = { 10, 11 };
>> +static const unsigned lcd_pins[] = { 126, 127, 128, 129, 130, 131, 132,        133,
>> +       134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147,
>> +       148, 149, 150, 151, 152, 153, 154, 155 };
>> +static const unsigned uart0_pins[] = { 70, 71, 72, 73 };
>> +static const unsigned uart1_dte_pins[] = { 75, 76, 77, 78 };
>> +static const unsigned uart1_pins[] = { 74, 79, 80, 81 };
>> +static const unsigned uart3_pins[] = { 82, 83 };
>> +static const unsigned qspi_pins[] = { 104, 105, 106, 107 };
>> +static const unsigned nand_pins[] = { 110, 111, 112, 113, 114, 115, 116, 117,
>> +       118, 119, 120, 121, 122, 123, 124, 125 };
>> +static const unsigned sdio0_cd_pins[] = { 103 };
>> +static const unsigned sdio0_mmc_pins[] = { 100, 101, 102 };
>> +static const unsigned can0_spi4_pins[] = { 86, 87 };
>> +static const unsigned can1_spi4_pins[] = { 88, 89 };
>> +static const unsigned sdio1_cd_pins[] = { 93 };
>> +static const unsigned sdio1_led_pins[] = { 84, 85 };
>> +static const unsigned sdio1_mmc_pins[] = { 90, 91, 92 };
>> +static const unsigned camera_led_pins[] = { 156, 157, 158, 159, 160 };
>> +static const unsigned camera_rgmii_pins[] = { 169, 170, 171, 169, 170, 171,
>> +       172, 173 };
>> +static const unsigned camera_sram_rgmii_pins[] = { 161, 162, 163, 164, 165,
>> +       166, 167, 168 };
>> +static const unsigned qspi_gpio_pins[] = { 108, 109 };
>> +static const unsigned smart_card0_fcb_pins[] = { 45 };
>> +static const unsigned smart_card1_fcb_pins[] = { 51 };
>> +static const unsigned gpio0_3p3_pins[] = { 176 };
>> +static const unsigned gpio1_3p3_pins[] = { 177 };
>> +static const unsigned gpio2_3p3_pins[] = { 178 };
> 
> Looks good...
> 
Note these pins are definitions in the driver that help to describe the
pad layout. We can't really configure any individual pins in Cygnus.

>> +/*
>> + * List of groups names. Need to match the order in cygnus_pin_groups
>> + */
>> +static const char * const cygnus_pin_group_names[] = {
>> +       "gpio0",
>> +       "gpio1",
>> +       "gpio2",
>> +       "gpio3",
>> +       "gpio4",
>> +       "gpio5",
>> +       "gpio6",
>> +       "gpio7",
>> +       "gpio8",
>> +       "gpio9",
>> +       "gpio10",
>> +       "gpio11",
>> +       "gpio12",
>> +       "gpio13",
>> +       "gpio14",
>> +       "gpio15",
>> +       "gpio16",
>> +       "gpio17",
>> +       "gpio18",
>> +       "gpio19",
>> +       "gpio20",
>> +       "gpio21",
>> +       "gpio22",
>> +       "gpio23",
>> +       "pwm0",
>> +       "pwm1",
>> +       "pwm2",
>> +       "pwm3",
>> +       "sdio0",
>> +       "smart_card0",
>> +       "smart_card1",
>> +       "spi0",
>> +       "spi1",
>> +       "spi2",
>> +       "spi3",
>> +       "d1w",
>> +       "lcd",
>> +       "uart0",
>> +       "uart1_dte",
>> +       "uart1",
>> +       "uart3",
>> +       "qspi",
>> +       "nand",
>> +       "sdio0_cd",
>> +       "sdio0_mmc",
>> +       "can0_spi4",
>> +       "can1_spi4",
>> +       "sdio1_cd",
>> +       "sdio1_led",
>> +       "sdio1_mmc",
>> +       "camera_led",
>> +       "camera_rgmii",
>> +       "camera_sram_rgmii",
>> +       "qspi_gpio",
>> +       "smart_card0_fcb",
>> +       "smart_card1_fcb",
>> +       "gpio0_3p3",
>> +       "gpio1_3p3",
>> +       "gpio2_3p3",
>> +};
> 
> This looks very much like function names as noted in the binding.
> I would say, suffix every group with _grp or something so it's not
> as confusing. Remember, spi0 is a function of the SoC,
> pins {1,2} is just a group of pins that it may appear on.
> 
Yes, suffix every group with _grp helps a lot to clarify the confusion.
Will fix this.

>> +#define CYGNUS_PIN_FUNCTION(fcn_name, mux_val)                 \
>> +{                                                              \
>> +       .name = #fcn_name,                                      \
>> +       .group_names = cygnus_pin_group_names,                  \
>> +       .num_groups = ARRAY_SIZE(cygnus_pin_group_names),       \
>> +       .mux = mux_val,                                         \
>> +}
>> +
>> +/*
>> + * Cygnus has 4 alternate functions. All groups can be configured to any of
>> + * the 4 alternate functions
>> + */
>> +static const struct cygnus_pin_function cygnus_pin_functions[] = {
>> +       CYGNUS_PIN_FUNCTION(alt1, 0),
>> +       CYGNUS_PIN_FUNCTION(alt2, 1),
>> +       CYGNUS_PIN_FUNCTION(alt3, 2),
>> +       CYGNUS_PIN_FUNCTION(alt4, 3),
>> +};
> 
> These are not functions. These are per-pin mux ways.
> 
> Re-read the documentation of what a function is: it is not something
> abstract like "alternative something" but something very direct like
> uart0 or spi0.
> 
Yes, agree. Will fix.

>> +static int cygnus_dt_node_to_map(struct pinctrl_dev *pctrl_dev,
>> +               struct device_node *np, struct pinctrl_map **map,
>> +               unsigned *num_maps)
>> +{
> 
> After Sören Brinkmanns patches youy should be able to use core
> functions for this and avoid this code altogether.
> 

Will that help to take care our case, based on the way we will use
"function" and "group"?

>> +       num_groups = of_property_count_strings(np, "brcm,groups");
> 
> As mentioned, just "groups".
> 
I guess I will use "group"?

>> +       ret = of_property_read_string(np, "brcm,function", &function_name);
> 
> As mentioned, just "function".
> 
Yes.

>> +       ret = pinctrl_utils_reserve_map(pctrl_dev, map, &reserved_maps,
>> +                       num_maps, num_groups);
> 
> Good use of utilities!
> 
> Apart from this things look nice.
> 
> The main comment to address is the definition of functions.
> 
> Yours,
> Linus Walleij
> 
Thanks a lot for the review!!!
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[PATCH 2/4] pinctrl: cygnus: add initial pinctrl support

[Ray Jui]

On 1/9/2015 3:03 AM, Linus Walleij wrote:
> On Fri, Nov 28, 2014 at 12:46 AM, Ray Jui <rjui@broadcom.com> wrote:
> 
>> This adds the initial driver support for the Broadcom Cygnus pinctrl
>> controller. The Cygnus pinctrl controller supports group based
>> alternate function configuration
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>> Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
>> ---
>>  drivers/pinctrl/Kconfig              |    7 +
>>  drivers/pinctrl/Makefile             |    1 +
>>  drivers/pinctrl/pinctrl-bcm-cygnus.c |  753 ++++++++++++++++++++++++++++++++++
> 
> With the proliferation of Broadcom drivers, please first send a
> patch moving pinctrl-bcm281xx.c and pinctrl-bcm2835.c to
> drivers/pinctrl/broadcom or something, so we can collect them
> there.
> 
Okay. This change will be included as the first patch in the next patch set.

> I don't know if the hardware has any similarity though, so invite
> the authors of the previous drivers to review this code.
> 
They are completely different. The only similarity between Cygnus and
bcm281xx pinctrl is that they use the same concept of alternation
functions (1, 2, 3, 4) for mux configuration.

>> +config PINCTRL_BCM_CYGNUS
>> +       bool "Broadcom Cygnus pinctrl driver"
>> +       depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
>> +       select PINMUX
>> +       select PINCONF
>> +       select GENERIC_PINCONF
> 
> Nice that you use GENERIC_PINCONF! :)
> 
>> +/*
>> + * Cygnus pinctrl core
>> + *
>> + * @pctl: pointer to pinctrl_dev
>> + * @dev: pointer to the device
>> + * @base: I/O register base for Cygnus pinctrl configuration
>> + *
>> + */
>> +struct cygnus_pinctrl {
>> +       struct pinctrl_dev *pctl;
>> +       struct device *dev;
>> +       void __iomem *base;
>> +
>> +       const struct pinctrl_pin_desc *pins;
>> +       unsigned num_pins;
> 
> Why is this not simply just a part of struct pinctrl_desc?
> Why does it have to be multiplied here?
> 
Okay. Let me look into this.

>> +/*
>> + * List of groups of pins
>> + */
>> +static const unsigned gpio0_pins[] = { 12 };
>> +static const unsigned gpio1_pins[] = { 13 };
>> +static const unsigned gpio2_pins[] = { 14 };
>> +static const unsigned gpio3_pins[] = { 15 };
>> +static const unsigned gpio4_pins[] = { 16 };
>> +static const unsigned gpio5_pins[] = { 17 };
>> +static const unsigned gpio6_pins[] = { 18 };
>> +static const unsigned gpio7_pins[] = { 19 };
>> +static const unsigned gpio8_pins[] = { 20 };
>> +static const unsigned gpio9_pins[] = { 21 };
>> +static const unsigned gpio10_pins[] = { 22 };
>> +static const unsigned gpio11_pins[] = { 23 };
>> +static const unsigned gpio12_pins[] = { 24 };
>> +static const unsigned gpio13_pins[] = { 25 };
>> +static const unsigned gpio14_pins[] = { 26 };
>> +static const unsigned gpio15_pins[] = { 27 };
>> +static const unsigned gpio16_pins[] = { 28 };
>> +static const unsigned gpio17_pins[] = { 29 };
>> +static const unsigned gpio18_pins[] = { 30 };
>> +static const unsigned gpio19_pins[] = { 31 };
>> +static const unsigned gpio20_pins[] = { 32 };
>> +static const unsigned gpio21_pins[] = { 33 };
>> +static const unsigned gpio22_pins[] = { 34 };
>> +static const unsigned gpio23_pins[] = { 35 };
> 
> Have you considered implementing .gpio_request_enable()
> and .gpio_disable_free() to get around having to have one
> group for each GPIO line?
> 
Okay the Cygnus pin controller is really a mess. GPIO 0 ~ GPIO23 are
really 23 distinct groups, each with one pin. Then the rest of GPIOs go
under other groups. In general, when we set a group to alternate
function 4, all pins become GPIO.

>> +static const unsigned pwm0_pins[] = { 38 };
>> +static const unsigned pwm1_pins[] = { 39 };
>> +static const unsigned pwm2_pins[] = { 40 };
>> +static const unsigned pwm3_pins[] = { 41 };
>> +static const unsigned sdio0_pins[] = { 94, 95, 96, 97, 98, 99 };
>> +static const unsigned smart_card0_pins[] = { 42, 43, 44, 46, 47 };
>> +static const unsigned smart_card1_pins[] = { 48, 49, 50, 52, 53 };
>> +static const unsigned spi0_pins[] = { 54, 55, 56, 57 };
>> +static const unsigned spi1_pins[] = { 58, 59, 60, 61 };
>> +static const unsigned spi2_pins[] = { 62, 63, 64, 65 };
>> +static const unsigned spi3_pins[] = { 66, 67, 68, 69 };
>> +static const unsigned d1w_pins[] = { 10, 11 };
>> +static const unsigned lcd_pins[] = { 126, 127, 128, 129, 130, 131, 132,        133,
>> +       134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147,
>> +       148, 149, 150, 151, 152, 153, 154, 155 };
>> +static const unsigned uart0_pins[] = { 70, 71, 72, 73 };
>> +static const unsigned uart1_dte_pins[] = { 75, 76, 77, 78 };
>> +static const unsigned uart1_pins[] = { 74, 79, 80, 81 };
>> +static const unsigned uart3_pins[] = { 82, 83 };
>> +static const unsigned qspi_pins[] = { 104, 105, 106, 107 };
>> +static const unsigned nand_pins[] = { 110, 111, 112, 113, 114, 115, 116, 117,
>> +       118, 119, 120, 121, 122, 123, 124, 125 };
>> +static const unsigned sdio0_cd_pins[] = { 103 };
>> +static const unsigned sdio0_mmc_pins[] = { 100, 101, 102 };
>> +static const unsigned can0_spi4_pins[] = { 86, 87 };
>> +static const unsigned can1_spi4_pins[] = { 88, 89 };
>> +static const unsigned sdio1_cd_pins[] = { 93 };
>> +static const unsigned sdio1_led_pins[] = { 84, 85 };
>> +static const unsigned sdio1_mmc_pins[] = { 90, 91, 92 };
>> +static const unsigned camera_led_pins[] = { 156, 157, 158, 159, 160 };
>> +static const unsigned camera_rgmii_pins[] = { 169, 170, 171, 169, 170, 171,
>> +       172, 173 };
>> +static const unsigned camera_sram_rgmii_pins[] = { 161, 162, 163, 164, 165,
>> +       166, 167, 168 };
>> +static const unsigned qspi_gpio_pins[] = { 108, 109 };
>> +static const unsigned smart_card0_fcb_pins[] = { 45 };
>> +static const unsigned smart_card1_fcb_pins[] = { 51 };
>> +static const unsigned gpio0_3p3_pins[] = { 176 };
>> +static const unsigned gpio1_3p3_pins[] = { 177 };
>> +static const unsigned gpio2_3p3_pins[] = { 178 };
> 
> Looks good...
> 
Note these pins are definitions in the driver that help to describe the
pad layout. We can't really configure any individual pins in Cygnus.

>> +/*
>> + * List of groups names. Need to match the order in cygnus_pin_groups
>> + */
>> +static const char * const cygnus_pin_group_names[] = {
>> +       "gpio0",
>> +       "gpio1",
>> +       "gpio2",
>> +       "gpio3",
>> +       "gpio4",
>> +       "gpio5",
>> +       "gpio6",
>> +       "gpio7",
>> +       "gpio8",
>> +       "gpio9",
>> +       "gpio10",
>> +       "gpio11",
>> +       "gpio12",
>> +       "gpio13",
>> +       "gpio14",
>> +       "gpio15",
>> +       "gpio16",
>> +       "gpio17",
>> +       "gpio18",
>> +       "gpio19",
>> +       "gpio20",
>> +       "gpio21",
>> +       "gpio22",
>> +       "gpio23",
>> +       "pwm0",
>> +       "pwm1",
>> +       "pwm2",
>> +       "pwm3",
>> +       "sdio0",
>> +       "smart_card0",
>> +       "smart_card1",
>> +       "spi0",
>> +       "spi1",
>> +       "spi2",
>> +       "spi3",
>> +       "d1w",
>> +       "lcd",
>> +       "uart0",
>> +       "uart1_dte",
>> +       "uart1",
>> +       "uart3",
>> +       "qspi",
>> +       "nand",
>> +       "sdio0_cd",
>> +       "sdio0_mmc",
>> +       "can0_spi4",
>> +       "can1_spi4",
>> +       "sdio1_cd",
>> +       "sdio1_led",
>> +       "sdio1_mmc",
>> +       "camera_led",
>> +       "camera_rgmii",
>> +       "camera_sram_rgmii",
>> +       "qspi_gpio",
>> +       "smart_card0_fcb",
>> +       "smart_card1_fcb",
>> +       "gpio0_3p3",
>> +       "gpio1_3p3",
>> +       "gpio2_3p3",
>> +};
> 
> This looks very much like function names as noted in the binding.
> I would say, suffix every group with _grp or something so it's not
> as confusing. Remember, spi0 is a function of the SoC,
> pins {1,2} is just a group of pins that it may appear on.
> 
Yes, suffix every group with _grp helps a lot to clarify the confusion.
Will fix this.

>> +#define CYGNUS_PIN_FUNCTION(fcn_name, mux_val)                 \
>> +{                                                              \
>> +       .name = #fcn_name,                                      \
>> +       .group_names = cygnus_pin_group_names,                  \
>> +       .num_groups = ARRAY_SIZE(cygnus_pin_group_names),       \
>> +       .mux = mux_val,                                         \
>> +}
>> +
>> +/*
>> + * Cygnus has 4 alternate functions. All groups can be configured to any of
>> + * the 4 alternate functions
>> + */
>> +static const struct cygnus_pin_function cygnus_pin_functions[] = {
>> +       CYGNUS_PIN_FUNCTION(alt1, 0),
>> +       CYGNUS_PIN_FUNCTION(alt2, 1),
>> +       CYGNUS_PIN_FUNCTION(alt3, 2),
>> +       CYGNUS_PIN_FUNCTION(alt4, 3),
>> +};
> 
> These are not functions. These are per-pin mux ways.
> 
> Re-read the documentation of what a function is: it is not something
> abstract like "alternative something" but something very direct like
> uart0 or spi0.
> 
Yes, agree. Will fix.

>> +static int cygnus_dt_node_to_map(struct pinctrl_dev *pctrl_dev,
>> +               struct device_node *np, struct pinctrl_map **map,
>> +               unsigned *num_maps)
>> +{
> 
> After S?ren Brinkmanns patches youy should be able to use core
> functions for this and avoid this code altogether.
> 

Will that help to take care our case, based on the way we will use
"function" and "group"?

>> +       num_groups = of_property_count_strings(np, "brcm,groups");
> 
> As mentioned, just "groups".
> 
I guess I will use "group"?

>> +       ret = of_property_read_string(np, "brcm,function", &function_name);
> 
> As mentioned, just "function".
> 
Yes.

>> +       ret = pinctrl_utils_reserve_map(pctrl_dev, map, &reserved_maps,
>> +                       num_maps, num_groups);
> 
> Good use of utilities!
> 
> Apart from this things look nice.
> 
> The main comment to address is the definition of functions.
> 
> Yours,
> Linus Walleij
> 
Thanks a lot for the review!!!

Re: [PATCH 1/5] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Linus Walleij]

On Sat, Dec 6, 2014 at 1:40 AM, Ray Jui <rjui@broadcom.com> wrote:

> Document the GPIO device tree binding for Broadcom Cygnus SoC
>
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
(...)
> +- #gpio-cells:
> +    Must be two. The first cell is the GPIO pin number (within the
> +controller's domain) and the second cell is used for the following:
> +    bit[0]: polarity (0 for normal and 1 for inverted)
> +    bit[18:16]: internal pull up/down: 0 - pull up/down disabled
> +                                       1 - pull up enabled
> +                                       2 - pull down enabled
> +    bit[22:20]: drive strength: 0 - 2 mA
> +                                1 - 4 mA
> +                                2 - 6 mA
> +                                3 - 8 mA
> +                                4 - 10 mA
> +                                5 - 12 mA
> +                                6 - 14 mA
> +                                7 - 16 mA

No. This pull up/down and drive strength is pin controller
business, use a pin control backend behind the GPIO driver
see Documentation/pinctrl.txt.

Initial states for these configurations can be set up using
pin control hogs since pin control and GPIO is orthogonal.

Yours,
Linus Walleij

Re: [PATCH 1/5] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Linus Walleij]

On Sat, Dec 6, 2014 at 1:40 AM, Ray Jui <rjui@broadcom.com> wrote:

> Document the GPIO device tree binding for Broadcom Cygnus SoC
>
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
(...)
> +- #gpio-cells:
> +    Must be two. The first cell is the GPIO pin number (within the
> +controller's domain) and the second cell is used for the following:
> +    bit[0]: polarity (0 for normal and 1 for inverted)
> +    bit[18:16]: internal pull up/down: 0 - pull up/down disabled
> +                                       1 - pull up enabled
> +                                       2 - pull down enabled
> +    bit[22:20]: drive strength: 0 - 2 mA
> +                                1 - 4 mA
> +                                2 - 6 mA
> +                                3 - 8 mA
> +                                4 - 10 mA
> +                                5 - 12 mA
> +                                6 - 14 mA
> +                                7 - 16 mA

No. This pull up/down and drive strength is pin controller
business, use a pin control backend behind the GPIO driver
see Documentation/pinctrl.txt.

Initial states for these configurations can be set up using
pin control hogs since pin control and GPIO is orthogonal.

Yours,
Linus Walleij

[PATCH 1/5] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Linus Walleij]

On Sat, Dec 6, 2014 at 1:40 AM, Ray Jui <rjui@broadcom.com> wrote:

> Document the GPIO device tree binding for Broadcom Cygnus SoC
>
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
(...)
> +- #gpio-cells:
> +    Must be two. The first cell is the GPIO pin number (within the
> +controller's domain) and the second cell is used for the following:
> +    bit[0]: polarity (0 for normal and 1 for inverted)
> +    bit[18:16]: internal pull up/down: 0 - pull up/down disabled
> +                                       1 - pull up enabled
> +                                       2 - pull down enabled
> +    bit[22:20]: drive strength: 0 - 2 mA
> +                                1 - 4 mA
> +                                2 - 6 mA
> +                                3 - 8 mA
> +                                4 - 10 mA
> +                                5 - 12 mA
> +                                6 - 14 mA
> +                                7 - 16 mA

No. This pull up/down and drive strength is pin controller
business, use a pin control backend behind the GPIO driver
see Documentation/pinctrl.txt.

Initial states for these configurations can be set up using
pin control hogs since pin control and GPIO is orthogonal.

Yours,
Linus Walleij

Re: [PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Linus Walleij]

On Mon, Dec 15, 2014 at 10:57 PM, Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org> wrote:
> On Monday 15 December 2014 13:35:47 Ray Jui wrote:
>>
>> Like I said previously, dynamic GPIO allocation works fine in the
>> kernel, as long as all of our GPIO clients in the kernel use gpiod based
>> API, which is what we will enforce going forward. The only problem is
>> with some of our customers who use GPIO through sysfs and expect fixed
>> global GPIO numbers. Thinking about this more, it's probably not that
>> difficult to add a script for those customers to convert/map the GPIO
>> numbers based on readings parsed from sysfs, so I guess that's fine.
>>
>
> I think we discussed the user space interface a number of times
> in the past, but I forgot the outcome. Either there is already
> a way to name gpio lines uniquely in sysfs, or there should be
> one.

There is one. The struct gpio_chip contains a .names field with
strings giving names to the GPIOs on the chip.

This field does not have standardized DT bindings or anything
but should be used.

Overall the sysfs interface is an abomination for relying on
the notoriously unstable GPIO numberspace and other things.
It was merged when the subsystem lacked a maintainer.

Yours,
Linus Walleij
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Re: [PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Linus Walleij]

On Mon, Dec 15, 2014 at 10:57 PM, Arnd Bergmann <arnd@arndb.de> wrote:
> On Monday 15 December 2014 13:35:47 Ray Jui wrote:
>>
>> Like I said previously, dynamic GPIO allocation works fine in the
>> kernel, as long as all of our GPIO clients in the kernel use gpiod based
>> API, which is what we will enforce going forward. The only problem is
>> with some of our customers who use GPIO through sysfs and expect fixed
>> global GPIO numbers. Thinking about this more, it's probably not that
>> difficult to add a script for those customers to convert/map the GPIO
>> numbers based on readings parsed from sysfs, so I guess that's fine.
>>
>
> I think we discussed the user space interface a number of times
> in the past, but I forgot the outcome. Either there is already
> a way to name gpio lines uniquely in sysfs, or there should be
> one.

There is one. The struct gpio_chip contains a .names field with
strings giving names to the GPIOs on the chip.

This field does not have standardized DT bindings or anything
but should be used.

Overall the sysfs interface is an abomination for relying on
the notoriously unstable GPIO numberspace and other things.
It was merged when the subsystem lacked a maintainer.

Yours,
Linus Walleij

[PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Linus Walleij]

On Mon, Dec 15, 2014 at 10:57 PM, Arnd Bergmann <arnd@arndb.de> wrote:
> On Monday 15 December 2014 13:35:47 Ray Jui wrote:
>>
>> Like I said previously, dynamic GPIO allocation works fine in the
>> kernel, as long as all of our GPIO clients in the kernel use gpiod based
>> API, which is what we will enforce going forward. The only problem is
>> with some of our customers who use GPIO through sysfs and expect fixed
>> global GPIO numbers. Thinking about this more, it's probably not that
>> difficult to add a script for those customers to convert/map the GPIO
>> numbers based on readings parsed from sysfs, so I guess that's fine.
>>
>
> I think we discussed the user space interface a number of times
> in the past, but I forgot the outcome. Either there is already
> a way to name gpio lines uniquely in sysfs, or there should be
> one.

There is one. The struct gpio_chip contains a .names field with
strings giving names to the GPIOs on the chip.

This field does not have standardized DT bindings or anything
but should be used.

Overall the sysfs interface is an abomination for relying on
the notoriously unstable GPIO numberspace and other things.
It was merged when the subsystem lacked a maintainer.

Yours,
Linus Walleij

Re: [PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Linus Walleij]

On Wed, Dec 17, 2014 at 11:44 AM, Russell King - ARM Linux
<linux@arm.linux.org.uk> wrote:
> On Wed, Dec 17, 2014 at 11:45:01AM +0900, Alexandre Courbot wrote:
>> Actually we are not that far from being able to do completely without
>> any GPIO number, and maybe that's what we should aim for. I think the
>> only remaining offender is the sysfs interface.
>
> And that is a user API, and there's lots of users of it (eg, on Raspberry
> Pi platforms.)  So changing it isn't going to be easy - I'd say that it's
> impractical.
>
> What you're suggesting would be like re-numbering Linux syscalls.

The problem is that right now if we set the .base of a gpio_chip
to -1 for dynamic allocation of GPIO numbers and we have more
than one GPIO chip in the system, the numbers basically depend
on probe order, and may theoretically even differ between two boots.

So in these cases preserving the ABI means preserving the
unpredictability of these assigned numbers or something.

For the old usecases with a single GPIO controller and a fixed
base offset of e.g. 0 (which I suspect was implicit in the initial
design of the subsystem) things work fine as always, it's these new
dynamic use cases that destabilize the ABI.

Yours,
Linus Walleij

Re: [PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Linus Walleij]

On Wed, Dec 17, 2014 at 11:44 AM, Russell King - ARM Linux
<linux@arm.linux.org.uk> wrote:
> On Wed, Dec 17, 2014 at 11:45:01AM +0900, Alexandre Courbot wrote:
>> Actually we are not that far from being able to do completely without
>> any GPIO number, and maybe that's what we should aim for. I think the
>> only remaining offender is the sysfs interface.
>
> And that is a user API, and there's lots of users of it (eg, on Raspberry
> Pi platforms.)  So changing it isn't going to be easy - I'd say that it's
> impractical.
>
> What you're suggesting would be like re-numbering Linux syscalls.

The problem is that right now if we set the .base of a gpio_chip
to -1 for dynamic allocation of GPIO numbers and we have more
than one GPIO chip in the system, the numbers basically depend
on probe order, and may theoretically even differ between two boots.

So in these cases preserving the ABI means preserving the
unpredictability of these assigned numbers or something.

For the old usecases with a single GPIO controller and a fixed
base offset of e.g. 0 (which I suspect was implicit in the initial
design of the subsystem) things work fine as always, it's these new
dynamic use cases that destabilize the ABI.

Yours,
Linus Walleij

[PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Linus Walleij]

On Wed, Dec 17, 2014 at 11:44 AM, Russell King - ARM Linux
<linux@arm.linux.org.uk> wrote:
> On Wed, Dec 17, 2014 at 11:45:01AM +0900, Alexandre Courbot wrote:
>> Actually we are not that far from being able to do completely without
>> any GPIO number, and maybe that's what we should aim for. I think the
>> only remaining offender is the sysfs interface.
>
> And that is a user API, and there's lots of users of it (eg, on Raspberry
> Pi platforms.)  So changing it isn't going to be easy - I'd say that it's
> impractical.
>
> What you're suggesting would be like re-numbering Linux syscalls.

The problem is that right now if we set the .base of a gpio_chip
to -1 for dynamic allocation of GPIO numbers and we have more
than one GPIO chip in the system, the numbers basically depend
on probe order, and may theoretically even differ between two boots.

So in these cases preserving the ABI means preserving the
unpredictability of these assigned numbers or something.

For the old usecases with a single GPIO controller and a fixed
base offset of e.g. 0 (which I suspect was implicit in the initial
design of the subsystem) things work fine as always, it's these new
dynamic use cases that destabilize the ABI.

Yours,
Linus Walleij

Re: [PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Linus Walleij]

On Fri, Jan 9, 2015 at 7:26 PM, Ray Jui <rjui@broadcom.com> wrote:
> On 1/9/2015 2:12 AM, Linus Walleij wrote:

>> Just use "groups" and "function" and refer to
>> Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
>>
>> Then "alt1", "alt2" etc are non-functional names of functions.
>> Use the real function names, like "spi0" or so. This
>> alt-business seems to be just a shortcut to make it
>> simple, don't do that.
>>
>> Then you use e.g. "spi0" as a group name. I prefer you
>> call that "spi0_grp" or something to say it is a group of
>> pins associated with spi0, as spi0 is actually the
>> function.
>>
> Hmmm, I did this by following brcm,bcm11351-pinctrl.txt:
> - function: String. Specifies the pin mux selection. Values must be one
> of: "alt1", "alt2", "alt3", "alt4"
>
> But you are right, in the pinctrl binding document it describes the
> generic pin multiplexing nodes use "function" and "group".

Note "function" and "groups". Note groups is pluralis. You can
select multiple groups for a single function.

> For example, the group "lcd" covers 30 pins. When I configure "lcd" to
> alternate function 1, all 30 pins are muxed to LCD function. When
> configured to function 2, all pins are muxed to SRAM function. Now, here
> comes the issue, when configured to function 3, pins 1-15 and 20-30
> become GPIO function, but pins 16-19 becomes SPI5 function. When it's
> configured to function 4, all 30 pins become GPIO.

I would split the use case in two groups for LCD and SRAM,
and three groups for GPIO:
"lcd_grp", "sram_grp", "gpio-1-15_grp",
"gpio-16-19_grp", "gpio-20-30_grp", "spi5_grp"

Valid combinations become

function = "lcd"
groups = "lcd_grp";

function = "sram"
groups = "sram_grp"

For all GPIO only this:

function = "gpio"
groups = "gpio-1-16_grp", "gpio-16-19_grp", "gpio-20-30_grp"

For a combined GPIO+SPI:

function = "gpio"
groups = "gpio-1-16_grp", "gpio-20-30_grp"

function = "spi5"
groups = "spi5_grp"

The pinctrl runtile will protest if you try to combine spi5_grp
with gpio-16-19_grp.

> In some other cases, when I configure a group to other functions, there
> could be spare pins which become unused (not brought out to the pad).
> Or, the spare pins may also become a separate function.

That's cool.

> Based on the LCD example, I'd assume I would do the following for the
> default LCD function:
>
> lcd_node {
>         group = "lcd_grp";
>         function = "lcd";
> };
>
> And in the case of function 3, I would call the function "spi5" and
> assume the rest of pins become either GPIO (or unused)?
>
> spi5_node {
>         group = "lcd_grp";
>         function = "spi5";
> };

Looks cool per above.

You need some clever code in the driver to handle double-configuration
of registers and so on, but I think it can be done.

Using pin control as a GPIO backend can be a bit tricky and will need
some testing and elaboration, but the subsystem will block collisions.

Yours,
Linus Walleij

Re: [PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Linus Walleij]

On Fri, Jan 9, 2015 at 7:26 PM, Ray Jui <rjui@broadcom.com> wrote:
> On 1/9/2015 2:12 AM, Linus Walleij wrote:

>> Just use "groups" and "function" and refer to
>> Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
>>
>> Then "alt1", "alt2" etc are non-functional names of functions.
>> Use the real function names, like "spi0" or so. This
>> alt-business seems to be just a shortcut to make it
>> simple, don't do that.
>>
>> Then you use e.g. "spi0" as a group name. I prefer you
>> call that "spi0_grp" or something to say it is a group of
>> pins associated with spi0, as spi0 is actually the
>> function.
>>
> Hmmm, I did this by following brcm,bcm11351-pinctrl.txt:
> - function: String. Specifies the pin mux selection. Values must be one
> of: "alt1", "alt2", "alt3", "alt4"
>
> But you are right, in the pinctrl binding document it describes the
> generic pin multiplexing nodes use "function" and "group".

Note "function" and "groups". Note groups is pluralis. You can
select multiple groups for a single function.

> For example, the group "lcd" covers 30 pins. When I configure "lcd" to
> alternate function 1, all 30 pins are muxed to LCD function. When
> configured to function 2, all pins are muxed to SRAM function. Now, here
> comes the issue, when configured to function 3, pins 1-15 and 20-30
> become GPIO function, but pins 16-19 becomes SPI5 function. When it's
> configured to function 4, all 30 pins become GPIO.

I would split the use case in two groups for LCD and SRAM,
and three groups for GPIO:
"lcd_grp", "sram_grp", "gpio-1-15_grp",
"gpio-16-19_grp", "gpio-20-30_grp", "spi5_grp"

Valid combinations become

function = "lcd"
groups = "lcd_grp";

function = "sram"
groups = "sram_grp"

For all GPIO only this:

function = "gpio"
groups = "gpio-1-16_grp", "gpio-16-19_grp", "gpio-20-30_grp"

For a combined GPIO+SPI:

function = "gpio"
groups = "gpio-1-16_grp", "gpio-20-30_grp"

function = "spi5"
groups = "spi5_grp"

The pinctrl runtile will protest if you try to combine spi5_grp
with gpio-16-19_grp.

> In some other cases, when I configure a group to other functions, there
> could be spare pins which become unused (not brought out to the pad).
> Or, the spare pins may also become a separate function.

That's cool.

> Based on the LCD example, I'd assume I would do the following for the
> default LCD function:
>
> lcd_node {
>         group = "lcd_grp";
>         function = "lcd";
> };
>
> And in the case of function 3, I would call the function "spi5" and
> assume the rest of pins become either GPIO (or unused)?
>
> spi5_node {
>         group = "lcd_grp";
>         function = "spi5";
> };

Looks cool per above.

You need some clever code in the driver to handle double-configuration
of registers and so on, but I think it can be done.

Using pin control as a GPIO backend can be a bit tricky and will need
some testing and elaboration, but the subsystem will block collisions.

Yours,
Linus Walleij

[PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Linus Walleij]

On Fri, Jan 9, 2015 at 7:26 PM, Ray Jui <rjui@broadcom.com> wrote:
> On 1/9/2015 2:12 AM, Linus Walleij wrote:

>> Just use "groups" and "function" and refer to
>> Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
>>
>> Then "alt1", "alt2" etc are non-functional names of functions.
>> Use the real function names, like "spi0" or so. This
>> alt-business seems to be just a shortcut to make it
>> simple, don't do that.
>>
>> Then you use e.g. "spi0" as a group name. I prefer you
>> call that "spi0_grp" or something to say it is a group of
>> pins associated with spi0, as spi0 is actually the
>> function.
>>
> Hmmm, I did this by following brcm,bcm11351-pinctrl.txt:
> - function: String. Specifies the pin mux selection. Values must be one
> of: "alt1", "alt2", "alt3", "alt4"
>
> But you are right, in the pinctrl binding document it describes the
> generic pin multiplexing nodes use "function" and "group".

Note "function" and "groups". Note groups is pluralis. You can
select multiple groups for a single function.

> For example, the group "lcd" covers 30 pins. When I configure "lcd" to
> alternate function 1, all 30 pins are muxed to LCD function. When
> configured to function 2, all pins are muxed to SRAM function. Now, here
> comes the issue, when configured to function 3, pins 1-15 and 20-30
> become GPIO function, but pins 16-19 becomes SPI5 function. When it's
> configured to function 4, all 30 pins become GPIO.

I would split the use case in two groups for LCD and SRAM,
and three groups for GPIO:
"lcd_grp", "sram_grp", "gpio-1-15_grp",
"gpio-16-19_grp", "gpio-20-30_grp", "spi5_grp"

Valid combinations become

function = "lcd"
groups = "lcd_grp";

function = "sram"
groups = "sram_grp"

For all GPIO only this:

function = "gpio"
groups = "gpio-1-16_grp", "gpio-16-19_grp", "gpio-20-30_grp"

For a combined GPIO+SPI:

function = "gpio"
groups = "gpio-1-16_grp", "gpio-20-30_grp"

function = "spi5"
groups = "spi5_grp"

The pinctrl runtile will protest if you try to combine spi5_grp
with gpio-16-19_grp.

> In some other cases, when I configure a group to other functions, there
> could be spare pins which become unused (not brought out to the pad).
> Or, the spare pins may also become a separate function.

That's cool.

> Based on the LCD example, I'd assume I would do the following for the
> default LCD function:
>
> lcd_node {
>         group = "lcd_grp";
>         function = "lcd";
> };
>
> And in the case of function 3, I would call the function "spi5" and
> assume the rest of pins become either GPIO (or unused)?
>
> spi5_node {
>         group = "lcd_grp";
>         function = "spi5";
> };

Looks cool per above.

You need some clever code in the driver to handle double-configuration
of registers and so on, but I think it can be done.

Using pin control as a GPIO backend can be a bit tricky and will need
some testing and elaboration, but the subsystem will block collisions.

Yours,
Linus Walleij

Re: [PATCH 2/4] pinctrl: cygnus: add initial pinctrl support

[Linus Walleij]

On Fri, Jan 9, 2015 at 7:38 PM, Ray Jui <rjui@broadcom.com> wrote:
> On 1/9/2015 3:03 AM, Linus Walleij wrote:
>> On Fri, Nov 28, 2014 at 12:46 AM, Ray Jui <rjui@broadcom.com> wrote:

>> I don't know if the hardware has any similarity though, so invite
>> the authors of the previous drivers to review this code.
>>
> They are completely different. The only similarity between Cygnus and
> bcm281xx pinctrl is that they use the same concept of alternation
> functions (1, 2, 3, 4) for mux configuration.

Then you can probably look at that driver for inspiration on how to handle
the situation you described earlier with collissions.

>>> +/*
>>> + * List of groups of pins
>>> + */
>>> +static const unsigned gpio0_pins[] = { 12 };
>>> +static const unsigned gpio1_pins[] = { 13 };
>>> +static const unsigned gpio2_pins[] = { 14 };
>>> +static const unsigned gpio3_pins[] = { 15 };
>>> +static const unsigned gpio4_pins[] = { 16 };
>>> +static const unsigned gpio5_pins[] = { 17 };
>>> +static const unsigned gpio6_pins[] = { 18 };
>>> +static const unsigned gpio7_pins[] = { 19 };
>>> +static const unsigned gpio8_pins[] = { 20 };
>>> +static const unsigned gpio9_pins[] = { 21 };
>>> +static const unsigned gpio10_pins[] = { 22 };
>>> +static const unsigned gpio11_pins[] = { 23 };
>>> +static const unsigned gpio12_pins[] = { 24 };
>>> +static const unsigned gpio13_pins[] = { 25 };
>>> +static const unsigned gpio14_pins[] = { 26 };
>>> +static const unsigned gpio15_pins[] = { 27 };
>>> +static const unsigned gpio16_pins[] = { 28 };
>>> +static const unsigned gpio17_pins[] = { 29 };
>>> +static const unsigned gpio18_pins[] = { 30 };
>>> +static const unsigned gpio19_pins[] = { 31 };
>>> +static const unsigned gpio20_pins[] = { 32 };
>>> +static const unsigned gpio21_pins[] = { 33 };
>>> +static const unsigned gpio22_pins[] = { 34 };
>>> +static const unsigned gpio23_pins[] = { 35 };
>>
>> Have you considered implementing .gpio_request_enable()
>> and .gpio_disable_free() to get around having to have one
>> group for each GPIO line?
>>
> Okay the Cygnus pin controller is really a mess. GPIO 0 ~ GPIO23 are
> really 23 distinct groups, each with one pin. Then the rest of GPIOs go
> under other groups. In general, when we set a group to alternate
> function 4, all pins become GPIO.

It will require some complicated code no matter how you
handle it I'm afraid. Rely on the pin control subsystem
to handle collisions though.

>>> +static const unsigned qspi_gpio_pins[] = { 108, 109 };
>>> +static const unsigned smart_card0_fcb_pins[] = { 45 };
>>> +static const unsigned smart_card1_fcb_pins[] = { 51 };
>>> +static const unsigned gpio0_3p3_pins[] = { 176 };
>>> +static const unsigned gpio1_3p3_pins[] = { 177 };
>>> +static const unsigned gpio2_3p3_pins[] = { 178 };
>>
>> Looks good...
>>
> Note these pins are definitions in the driver that help to describe the
> pad layout. We can't really configure any individual pins in Cygnus.

Yeah it's a groupwise controller then, that's similar to
e.g. the coh901 driver.

We should be able to accomodate this...

>>> +static int cygnus_dt_node_to_map(struct pinctrl_dev *pctrl_dev,
>>> +               struct device_node *np, struct pinctrl_map **map,
>>> +               unsigned *num_maps)
>>> +{
>>
>> After Sören Brinkmanns patches youy should be able to use core
>> functions for this and avoid this code altogether.
>
> Will that help to take care our case, based on the way we will use
> "function" and "group"?

groupS but yes it will work with your controller, though I think
.set_mux and the controller state will need some elaborate code
to handle what the framework requests.

>>> +       num_groups = of_property_count_strings(np, "brcm,groups");
>>
>> As mentioned, just "groups".
>>
> I guess I will use "group"?

No groups, as with the standard attribute "gpios", this may be
a single group too, it's just a standard binding.

Yours,
Linus Walleij

Re: [PATCH 2/4] pinctrl: cygnus: add initial pinctrl support

[Linus Walleij]

On Fri, Jan 9, 2015 at 7:38 PM, Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org> wrote:
> On 1/9/2015 3:03 AM, Linus Walleij wrote:
>> On Fri, Nov 28, 2014 at 12:46 AM, Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org> wrote:

>> I don't know if the hardware has any similarity though, so invite
>> the authors of the previous drivers to review this code.
>>
> They are completely different. The only similarity between Cygnus and
> bcm281xx pinctrl is that they use the same concept of alternation
> functions (1, 2, 3, 4) for mux configuration.

Then you can probably look at that driver for inspiration on how to handle
the situation you described earlier with collissions.

>>> +/*
>>> + * List of groups of pins
>>> + */
>>> +static const unsigned gpio0_pins[] = { 12 };
>>> +static const unsigned gpio1_pins[] = { 13 };
>>> +static const unsigned gpio2_pins[] = { 14 };
>>> +static const unsigned gpio3_pins[] = { 15 };
>>> +static const unsigned gpio4_pins[] = { 16 };
>>> +static const unsigned gpio5_pins[] = { 17 };
>>> +static const unsigned gpio6_pins[] = { 18 };
>>> +static const unsigned gpio7_pins[] = { 19 };
>>> +static const unsigned gpio8_pins[] = { 20 };
>>> +static const unsigned gpio9_pins[] = { 21 };
>>> +static const unsigned gpio10_pins[] = { 22 };
>>> +static const unsigned gpio11_pins[] = { 23 };
>>> +static const unsigned gpio12_pins[] = { 24 };
>>> +static const unsigned gpio13_pins[] = { 25 };
>>> +static const unsigned gpio14_pins[] = { 26 };
>>> +static const unsigned gpio15_pins[] = { 27 };
>>> +static const unsigned gpio16_pins[] = { 28 };
>>> +static const unsigned gpio17_pins[] = { 29 };
>>> +static const unsigned gpio18_pins[] = { 30 };
>>> +static const unsigned gpio19_pins[] = { 31 };
>>> +static const unsigned gpio20_pins[] = { 32 };
>>> +static const unsigned gpio21_pins[] = { 33 };
>>> +static const unsigned gpio22_pins[] = { 34 };
>>> +static const unsigned gpio23_pins[] = { 35 };
>>
>> Have you considered implementing .gpio_request_enable()
>> and .gpio_disable_free() to get around having to have one
>> group for each GPIO line?
>>
> Okay the Cygnus pin controller is really a mess. GPIO 0 ~ GPIO23 are
> really 23 distinct groups, each with one pin. Then the rest of GPIOs go
> under other groups. In general, when we set a group to alternate
> function 4, all pins become GPIO.

It will require some complicated code no matter how you
handle it I'm afraid. Rely on the pin control subsystem
to handle collisions though.

>>> +static const unsigned qspi_gpio_pins[] = { 108, 109 };
>>> +static const unsigned smart_card0_fcb_pins[] = { 45 };
>>> +static const unsigned smart_card1_fcb_pins[] = { 51 };
>>> +static const unsigned gpio0_3p3_pins[] = { 176 };
>>> +static const unsigned gpio1_3p3_pins[] = { 177 };
>>> +static const unsigned gpio2_3p3_pins[] = { 178 };
>>
>> Looks good...
>>
> Note these pins are definitions in the driver that help to describe the
> pad layout. We can't really configure any individual pins in Cygnus.

Yeah it's a groupwise controller then, that's similar to
e.g. the coh901 driver.

We should be able to accomodate this...

>>> +static int cygnus_dt_node_to_map(struct pinctrl_dev *pctrl_dev,
>>> +               struct device_node *np, struct pinctrl_map **map,
>>> +               unsigned *num_maps)
>>> +{
>>
>> After Sören Brinkmanns patches youy should be able to use core
>> functions for this and avoid this code altogether.
>
> Will that help to take care our case, based on the way we will use
> "function" and "group"?

groupS but yes it will work with your controller, though I think
.set_mux and the controller state will need some elaborate code
to handle what the framework requests.

>>> +       num_groups = of_property_count_strings(np, "brcm,groups");
>>
>> As mentioned, just "groups".
>>
> I guess I will use "group"?

No groups, as with the standard attribute "gpios", this may be
a single group too, it's just a standard binding.

Yours,
Linus Walleij
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[PATCH 2/4] pinctrl: cygnus: add initial pinctrl support

[Linus Walleij]

On Fri, Jan 9, 2015 at 7:38 PM, Ray Jui <rjui@broadcom.com> wrote:
> On 1/9/2015 3:03 AM, Linus Walleij wrote:
>> On Fri, Nov 28, 2014 at 12:46 AM, Ray Jui <rjui@broadcom.com> wrote:

>> I don't know if the hardware has any similarity though, so invite
>> the authors of the previous drivers to review this code.
>>
> They are completely different. The only similarity between Cygnus and
> bcm281xx pinctrl is that they use the same concept of alternation
> functions (1, 2, 3, 4) for mux configuration.

Then you can probably look at that driver for inspiration on how to handle
the situation you described earlier with collissions.

>>> +/*
>>> + * List of groups of pins
>>> + */
>>> +static const unsigned gpio0_pins[] = { 12 };
>>> +static const unsigned gpio1_pins[] = { 13 };
>>> +static const unsigned gpio2_pins[] = { 14 };
>>> +static const unsigned gpio3_pins[] = { 15 };
>>> +static const unsigned gpio4_pins[] = { 16 };
>>> +static const unsigned gpio5_pins[] = { 17 };
>>> +static const unsigned gpio6_pins[] = { 18 };
>>> +static const unsigned gpio7_pins[] = { 19 };
>>> +static const unsigned gpio8_pins[] = { 20 };
>>> +static const unsigned gpio9_pins[] = { 21 };
>>> +static const unsigned gpio10_pins[] = { 22 };
>>> +static const unsigned gpio11_pins[] = { 23 };
>>> +static const unsigned gpio12_pins[] = { 24 };
>>> +static const unsigned gpio13_pins[] = { 25 };
>>> +static const unsigned gpio14_pins[] = { 26 };
>>> +static const unsigned gpio15_pins[] = { 27 };
>>> +static const unsigned gpio16_pins[] = { 28 };
>>> +static const unsigned gpio17_pins[] = { 29 };
>>> +static const unsigned gpio18_pins[] = { 30 };
>>> +static const unsigned gpio19_pins[] = { 31 };
>>> +static const unsigned gpio20_pins[] = { 32 };
>>> +static const unsigned gpio21_pins[] = { 33 };
>>> +static const unsigned gpio22_pins[] = { 34 };
>>> +static const unsigned gpio23_pins[] = { 35 };
>>
>> Have you considered implementing .gpio_request_enable()
>> and .gpio_disable_free() to get around having to have one
>> group for each GPIO line?
>>
> Okay the Cygnus pin controller is really a mess. GPIO 0 ~ GPIO23 are
> really 23 distinct groups, each with one pin. Then the rest of GPIOs go
> under other groups. In general, when we set a group to alternate
> function 4, all pins become GPIO.

It will require some complicated code no matter how you
handle it I'm afraid. Rely on the pin control subsystem
to handle collisions though.

>>> +static const unsigned qspi_gpio_pins[] = { 108, 109 };
>>> +static const unsigned smart_card0_fcb_pins[] = { 45 };
>>> +static const unsigned smart_card1_fcb_pins[] = { 51 };
>>> +static const unsigned gpio0_3p3_pins[] = { 176 };
>>> +static const unsigned gpio1_3p3_pins[] = { 177 };
>>> +static const unsigned gpio2_3p3_pins[] = { 178 };
>>
>> Looks good...
>>
> Note these pins are definitions in the driver that help to describe the
> pad layout. We can't really configure any individual pins in Cygnus.

Yeah it's a groupwise controller then, that's similar to
e.g. the coh901 driver.

We should be able to accomodate this...

>>> +static int cygnus_dt_node_to_map(struct pinctrl_dev *pctrl_dev,
>>> +               struct device_node *np, struct pinctrl_map **map,
>>> +               unsigned *num_maps)
>>> +{
>>
>> After S?ren Brinkmanns patches youy should be able to use core
>> functions for this and avoid this code altogether.
>
> Will that help to take care our case, based on the way we will use
> "function" and "group"?

groupS but yes it will work with your controller, though I think
.set_mux and the controller state will need some elaborate code
to handle what the framework requests.

>>> +       num_groups = of_property_count_strings(np, "brcm,groups");
>>
>> As mentioned, just "groups".
>>
> I guess I will use "group"?

No groups, as with the standard attribute "gpios", this may be
a single group too, it's just a standard binding.

Yours,
Linus Walleij

Re: [PATCH v6 2/3] gpio: Cygnus: add GPIO driver

[Linus Walleij]

On Tue, Dec 16, 2014 at 3:18 AM, Ray Jui <rjui@broadcom.com> wrote:

> This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
> SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller, 2) the
> chipCommonG GPIO controller, and 3) the ALWAYS-ON GPIO controller
>
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>

(Big thanks to Alexandre for doing the major part of the review,
good work with following up so far!)

(...)
> +config GPIO_BCM_CYGNUS
> +       bool "Broadcom Cygnus GPIO support"
> +       depends on ARCH_BCM_CYGNUS && OF_GPIO

select GPIOLIB_IRQCHIP

See more about this below.

> +++ b/drivers/gpio/gpio-bcm-cygnus.c
> @@ -0,0 +1,607 @@
> +/*
> + * Copyright (C) 2014 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/slab.h>
> +#include <linux/module.h>
> +#include <linux/irq.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/gpio.h>
> +#include <linux/ioport.h>
> +#include <linux/of_device.h>
> +#include <linux/of_irq.h>
> +#include <linux/irqchip/chained_irq.h>

Skip <linux/irq.h> and <linux/irqchip/chained_irq.h>
as these move to the core with GPIOLIB_IRQCHIP

> +#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
> +#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
> +#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
> +#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
> +#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
> +#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
> +#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
> +#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
> +#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
> +#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
> +#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
> +#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
> +
> +/* drive strength control for ASIU GPIO */
> +#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
> +
> +/* drive strength control for CCM GPIO */
> +#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00

This stuff (drive strength) is pin control, pin config.
It does not belong in a pure GPIO driver. If you're
making a combined pin control + GPIO driver, it
shall be put in drivers/pinctrl/*

> +#define GPIO_BANK_SIZE 0x200
> +#define NGPIOS_PER_BANK 32
> +#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
> +
> +#define CYGNUS_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + (reg))
> +#define CYGNUS_GPIO_SHIFT(pin) ((pin) % NGPIOS_PER_BANK)
> +
> +#define GPIO_FLAG_BIT_MASK           0xffff
> +#define GPIO_PULL_BIT_SHIFT          16
> +#define GPIO_PULL_BIT_MASK           0x3
> +
> +#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
> +#define GPIO_DRV_STRENGTH_BITS       3
> +#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
> +
> +/*
> + * For GPIO internal pull up/down registers
> + */
> +enum gpio_pull {
> +       GPIO_PULL_NONE = 0,
> +       GPIO_PULL_UP,
> +       GPIO_PULL_DOWN,
> +       GPIO_PULL_INVALID,
> +};
> +
> +/*
> + * GPIO drive strength
> + */
> +enum gpio_drv_strength {
> +       GPIO_DRV_STRENGTH_2MA = 0,
> +       GPIO_DRV_STRENGTH_4MA,
> +       GPIO_DRV_STRENGTH_6MA,
> +       GPIO_DRV_STRENGTH_8MA,
> +       GPIO_DRV_STRENGTH_10MA,
> +       GPIO_DRV_STRENGTH_12MA,
> +       GPIO_DRV_STRENGTH_14MA,
> +       GPIO_DRV_STRENGTH_16MA,
> +       GPIO_DRV_STRENGTH_INVALID,
> +};


All this pull up/down and drive strength is pin config for
the pin control subsystem.

> +struct cygnus_gpio {
> +       struct device *dev;
> +       void __iomem *base;
> +       void __iomem *io_ctrl;
> +       spinlock_t lock;
> +       struct gpio_chip gc;
> +       unsigned num_banks;
> +       int irq;
> +       struct irq_domain *irq_domain;

Skip irq and irqdomain and use GPIOLIB_IRQCHIP

> +static u32 cygnus_readl(struct cygnus_gpio *cygnus_gpio, unsigned int offset)
> +{
> +       return readl(cygnus_gpio->base + offset);
> +}
> +
> +static void cygnus_writel(struct cygnus_gpio *cygnus_gpio,
> +                         unsigned int offset, u32 val)
> +{
> +       writel(val, cygnus_gpio->base + offset);
> +}

I don't see the value of using these accessors over just inlining
your readl/writel stuff.

(...)
> +static int cygnus_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
> +{
> +       struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
> +
> +       return irq_find_mapping(cygnus_gpio->irq_domain, offset);
> +}

This goes away to the core with GPIOLIB_IRQCHIP

> +static void cygnus_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
> +{
> +       struct cygnus_gpio *cygnus_gpio;
> +       struct irq_chip *chip = irq_desc_get_chip(desc);
> +       int i, bit;
> +
> +       chained_irq_enter(chip, desc);
> +
> +       cygnus_gpio = irq_get_handler_data(irq);
> +
> +       /* go through the entire GPIO banks and handle all interrupts */
> +       for (i = 0; i < cygnus_gpio->num_banks; i++) {
> +               unsigned long val = cygnus_readl(cygnus_gpio,
> +                               (i * GPIO_BANK_SIZE) +
> +                               CYGNUS_GPIO_INT_MSTAT_OFFSET);
> +
> +               for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
> +                       unsigned pin = NGPIOS_PER_BANK * i + bit;
> +                       int child_irq =
> +                               cygnus_gpio_to_irq(&cygnus_gpio->gc, pin);
> +
> +                       /*
> +                        * Clear the interrupt before invoking the
> +                        * handler, so we do not leave any window
> +                        */
> +                       cygnus_writel(cygnus_gpio, (i * GPIO_BANK_SIZE) +
> +                               CYGNUS_GPIO_INT_CLR_OFFSET, BIT(bit));
> +
> +                       generic_handle_irq(child_irq);
> +               }
> +       }
> +
> +       chained_irq_exit(chip, desc);
> +}

Looks good, but you will need to have the struct gpio_chip * as
handler data to use GPIOLIB_IRQCHIP, so get from there to
the struct cygnus_gpio something like:

struct gpio_chip *gc = irq_desc_get_handler_data(desc);
struct cygnus_gpio *cyg = to_cygnus_gpio(gc);

> +static int cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
> +{
> +       struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
> +       unsigned int offset = CYGNUS_GPIO_REG(gpio,
> +                       CYGNUS_GPIO_DATA_IN_OFFSET);
> +       unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
> +       u32 val;
> +
> +       val = cygnus_readl(cygnus_gpio, offset);
> +       val = (val >> shift) & 1;

No, do this:

return !!(cygnus_readl(cygnus_gpio, offset) & BIT(shift));

Maybe rename the "shift" variable to "bit" or just use the macro
directly in the readl().

> +static int cygnus_gpio_irq_map(struct irq_domain *d, unsigned int irq,
> +                              irq_hw_number_t hwirq)
> +{
> +       int ret;
> +
> +       ret = irq_set_chip_data(irq, d->host_data);
> +       if (ret < 0)
> +               return ret;
> +       irq_set_lockdep_class(irq, &gpio_lock_class);
> +       irq_set_chip_and_handler(irq, &cygnus_gpio_irq_chip,
> +                       handle_simple_irq);
> +       set_irq_flags(irq, IRQF_VALID);
> +
> +       return 0;
> +}
> +
> +static void cygnus_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
> +{
> +       irq_set_chip_and_handler(irq, NULL, NULL);
> +       irq_set_chip_data(irq, NULL);
> +}
> +
> +static struct irq_domain_ops cygnus_irq_ops = {
> +       .map = cygnus_gpio_irq_map,
> +       .unmap = cygnus_gpio_irq_unmap,
> +       .xlate = irq_domain_xlate_twocell,
> +};

All this goes away with GPIOLIB_IRQCHIP (that is what is good about it).

> +#ifdef CONFIG_OF_GPIO

What, that should be defined all the time, you depend on it in
Kconfig!

> +static void cygnus_gpio_set_pull(struct cygnus_gpio *cygnus_gpio,
> +                                unsigned gpio, enum gpio_pull pull)
(...)
> +static void cygnus_gpio_set_strength(struct cygnus_gpio *cygnus_gpio,
> +               unsigned gpio, enum gpio_drv_strength strength)
(...)
> +static int cygnus_gpio_of_xlate(struct gpio_chip *gc,
> +               const struct of_phandle_args *gpiospec, u32 *flags)

NAK. This is pin control, put this in the pin control driver.

I guess the same that is part of this patch series.

(...)
> +static int cygnus_gpio_probe(struct platform_device *pdev)
> +{
> +       struct device *dev = &pdev->dev;
> +       struct resource *res;
> +       struct cygnus_gpio *cygnus_gpio;
> +       struct gpio_chip *gc;
> +       u32 i, ngpios;
> +       int ret;
> +
> +       cygnus_gpio = devm_kzalloc(dev, sizeof(*cygnus_gpio), GFP_KERNEL);
> +       if (!cygnus_gpio)
> +               return -ENOMEM;
> +
> +       cygnus_gpio->dev = dev;
> +       platform_set_drvdata(pdev, cygnus_gpio);
> +
> +       if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
> +               dev_err(&pdev->dev, "missing ngpios DT property\n");
> +               return -ENODEV;
> +       }
> +       cygnus_gpio->num_banks = (ngpios + NGPIOS_PER_BANK - 1) /
> +               NGPIOS_PER_BANK;
> +
> +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +       cygnus_gpio->base = devm_ioremap_resource(dev, res);
> +       if (IS_ERR(cygnus_gpio->base)) {
> +               dev_err(&pdev->dev, "unable to map I/O memory\n");
> +               return PTR_ERR(cygnus_gpio->base);
> +       }
> +
> +       /*
> +        * Only certain types of Cygnus GPIO interfaces have I/O control
> +        * registers
> +        */
> +       res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> +       if (res) {
> +               cygnus_gpio->io_ctrl = devm_ioremap_resource(dev, res);
> +               if (IS_ERR(cygnus_gpio->io_ctrl)) {
> +                       dev_err(&pdev->dev, "unable to map I/O memory\n");
> +                       return PTR_ERR(cygnus_gpio->io_ctrl);
> +               }
> +       }

This is a good indication that it's a separate piece of HW and should
be a separate pin control driver.

> +
> +       spin_lock_init(&cygnus_gpio->lock);
> +
> +       gc = &cygnus_gpio->gc;
> +       gc->base = -1;
> +       gc->ngpio = ngpios;
> +       gc->label = dev_name(dev);
> +       gc->dev = dev;
> +#ifdef CONFIG_OF_GPIO

You depend on this symbol.

> +       gc->of_node = dev->of_node;
> +       gc->of_gpio_n_cells = 2;
> +       gc->of_xlate = cygnus_gpio_of_xlate;
> +#endif
> +       gc->direction_input = cygnus_gpio_direction_input;
> +       gc->direction_output = cygnus_gpio_direction_output;
> +       gc->set = cygnus_gpio_set;
> +       gc->get = cygnus_gpio_get;
> +       gc->to_irq = cygnus_gpio_to_irq;
> +
> +       ret = gpiochip_add(gc);
> +       if (ret < 0) {
> +               dev_err(&pdev->dev, "unable to add GPIO chip\n");
> +               return ret;
> +       }
> +
> +       /*
> +        * Some of the GPIO interfaces do not have interrupt wired to the main
> +        * processor
> +        */
> +       cygnus_gpio->irq = platform_get_irq(pdev, 0);
> +       if (cygnus_gpio->irq < 0) {
> +               ret = cygnus_gpio->irq;
> +               if (ret == -EPROBE_DEFER)
> +                       goto err_rm_gpiochip;
> +
> +               dev_info(&pdev->dev, "no interrupt hook\n");
> +       }

>From here:

> +       cygnus_gpio->irq_domain = irq_domain_add_linear(dev->of_node,
> +                       gc->ngpio, &cygnus_irq_ops, cygnus_gpio);
> +       if (!cygnus_gpio->irq_domain) {
> +               dev_err(&pdev->dev, "unable to allocate IRQ domain\n");
> +               ret = -ENXIO;
> +               goto err_rm_gpiochip;
> +       }
> +
> +       for (i = 0; i < gc->ngpio; i++) {
> +               int irq = irq_create_mapping(cygnus_gpio->irq_domain, i);
> +
> +               irq_set_lockdep_class(irq, &gpio_lock_class);
> +               irq_set_chip_data(irq, cygnus_gpio);
> +               irq_set_chip_and_handler(irq, &cygnus_gpio_irq_chip,
> +                               handle_simple_irq);
> +               set_irq_flags(irq, IRQF_VALID);
> +       }
> +
> +       irq_set_chained_handler(cygnus_gpio->irq, cygnus_gpio_irq_handler);
> +       irq_set_handler_data(cygnus_gpio->irq, cygnus_gpio);

To here, replace with a single call to
gpiochip_set_chained_irqchip(chip *, irq_chip *, irq, handler)...

Look at other drivers using GPIOLIB_IRQCHIP for inspiration.

Yours,
Linus Walleij

Re: [PATCH v6 2/3] gpio: Cygnus: add GPIO driver

[Linus Walleij]

On Tue, Dec 16, 2014 at 3:18 AM, Ray Jui <rjui@broadcom.com> wrote:

> This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
> SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller, 2) the
> chipCommonG GPIO controller, and 3) the ALWAYS-ON GPIO controller
>
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>

(Big thanks to Alexandre for doing the major part of the review,
good work with following up so far!)

(...)
> +config GPIO_BCM_CYGNUS
> +       bool "Broadcom Cygnus GPIO support"
> +       depends on ARCH_BCM_CYGNUS && OF_GPIO

select GPIOLIB_IRQCHIP

See more about this below.

> +++ b/drivers/gpio/gpio-bcm-cygnus.c
> @@ -0,0 +1,607 @@
> +/*
> + * Copyright (C) 2014 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/slab.h>
> +#include <linux/module.h>
> +#include <linux/irq.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/gpio.h>
> +#include <linux/ioport.h>
> +#include <linux/of_device.h>
> +#include <linux/of_irq.h>
> +#include <linux/irqchip/chained_irq.h>

Skip <linux/irq.h> and <linux/irqchip/chained_irq.h>
as these move to the core with GPIOLIB_IRQCHIP

> +#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
> +#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
> +#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
> +#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
> +#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
> +#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
> +#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
> +#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
> +#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
> +#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
> +#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
> +#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
> +
> +/* drive strength control for ASIU GPIO */
> +#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
> +
> +/* drive strength control for CCM GPIO */
> +#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00

This stuff (drive strength) is pin control, pin config.
It does not belong in a pure GPIO driver. If you're
making a combined pin control + GPIO driver, it
shall be put in drivers/pinctrl/*

> +#define GPIO_BANK_SIZE 0x200
> +#define NGPIOS_PER_BANK 32
> +#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
> +
> +#define CYGNUS_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + (reg))
> +#define CYGNUS_GPIO_SHIFT(pin) ((pin) % NGPIOS_PER_BANK)
> +
> +#define GPIO_FLAG_BIT_MASK           0xffff
> +#define GPIO_PULL_BIT_SHIFT          16
> +#define GPIO_PULL_BIT_MASK           0x3
> +
> +#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
> +#define GPIO_DRV_STRENGTH_BITS       3
> +#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
> +
> +/*
> + * For GPIO internal pull up/down registers
> + */
> +enum gpio_pull {
> +       GPIO_PULL_NONE = 0,
> +       GPIO_PULL_UP,
> +       GPIO_PULL_DOWN,
> +       GPIO_PULL_INVALID,
> +};
> +
> +/*
> + * GPIO drive strength
> + */
> +enum gpio_drv_strength {
> +       GPIO_DRV_STRENGTH_2MA = 0,
> +       GPIO_DRV_STRENGTH_4MA,
> +       GPIO_DRV_STRENGTH_6MA,
> +       GPIO_DRV_STRENGTH_8MA,
> +       GPIO_DRV_STRENGTH_10MA,
> +       GPIO_DRV_STRENGTH_12MA,
> +       GPIO_DRV_STRENGTH_14MA,
> +       GPIO_DRV_STRENGTH_16MA,
> +       GPIO_DRV_STRENGTH_INVALID,
> +};


All this pull up/down and drive strength is pin config for
the pin control subsystem.

> +struct cygnus_gpio {
> +       struct device *dev;
> +       void __iomem *base;
> +       void __iomem *io_ctrl;
> +       spinlock_t lock;
> +       struct gpio_chip gc;
> +       unsigned num_banks;
> +       int irq;
> +       struct irq_domain *irq_domain;

Skip irq and irqdomain and use GPIOLIB_IRQCHIP

> +static u32 cygnus_readl(struct cygnus_gpio *cygnus_gpio, unsigned int offset)
> +{
> +       return readl(cygnus_gpio->base + offset);
> +}
> +
> +static void cygnus_writel(struct cygnus_gpio *cygnus_gpio,
> +                         unsigned int offset, u32 val)
> +{
> +       writel(val, cygnus_gpio->base + offset);
> +}

I don't see the value of using these accessors over just inlining
your readl/writel stuff.

(...)
> +static int cygnus_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
> +{
> +       struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
> +
> +       return irq_find_mapping(cygnus_gpio->irq_domain, offset);
> +}

This goes away to the core with GPIOLIB_IRQCHIP

> +static void cygnus_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
> +{
> +       struct cygnus_gpio *cygnus_gpio;
> +       struct irq_chip *chip = irq_desc_get_chip(desc);
> +       int i, bit;
> +
> +       chained_irq_enter(chip, desc);
> +
> +       cygnus_gpio = irq_get_handler_data(irq);
> +
> +       /* go through the entire GPIO banks and handle all interrupts */
> +       for (i = 0; i < cygnus_gpio->num_banks; i++) {
> +               unsigned long val = cygnus_readl(cygnus_gpio,
> +                               (i * GPIO_BANK_SIZE) +
> +                               CYGNUS_GPIO_INT_MSTAT_OFFSET);
> +
> +               for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
> +                       unsigned pin = NGPIOS_PER_BANK * i + bit;
> +                       int child_irq =
> +                               cygnus_gpio_to_irq(&cygnus_gpio->gc, pin);
> +
> +                       /*
> +                        * Clear the interrupt before invoking the
> +                        * handler, so we do not leave any window
> +                        */
> +                       cygnus_writel(cygnus_gpio, (i * GPIO_BANK_SIZE) +
> +                               CYGNUS_GPIO_INT_CLR_OFFSET, BIT(bit));
> +
> +                       generic_handle_irq(child_irq);
> +               }
> +       }
> +
> +       chained_irq_exit(chip, desc);
> +}

Looks good, but you will need to have the struct gpio_chip * as
handler data to use GPIOLIB_IRQCHIP, so get from there to
the struct cygnus_gpio something like:

struct gpio_chip *gc = irq_desc_get_handler_data(desc);
struct cygnus_gpio *cyg = to_cygnus_gpio(gc);

> +static int cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
> +{
> +       struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
> +       unsigned int offset = CYGNUS_GPIO_REG(gpio,
> +                       CYGNUS_GPIO_DATA_IN_OFFSET);
> +       unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
> +       u32 val;
> +
> +       val = cygnus_readl(cygnus_gpio, offset);
> +       val = (val >> shift) & 1;

No, do this:

return !!(cygnus_readl(cygnus_gpio, offset) & BIT(shift));

Maybe rename the "shift" variable to "bit" or just use the macro
directly in the readl().

> +static int cygnus_gpio_irq_map(struct irq_domain *d, unsigned int irq,
> +                              irq_hw_number_t hwirq)
> +{
> +       int ret;
> +
> +       ret = irq_set_chip_data(irq, d->host_data);
> +       if (ret < 0)
> +               return ret;
> +       irq_set_lockdep_class(irq, &gpio_lock_class);
> +       irq_set_chip_and_handler(irq, &cygnus_gpio_irq_chip,
> +                       handle_simple_irq);
> +       set_irq_flags(irq, IRQF_VALID);
> +
> +       return 0;
> +}
> +
> +static void cygnus_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
> +{
> +       irq_set_chip_and_handler(irq, NULL, NULL);
> +       irq_set_chip_data(irq, NULL);
> +}
> +
> +static struct irq_domain_ops cygnus_irq_ops = {
> +       .map = cygnus_gpio_irq_map,
> +       .unmap = cygnus_gpio_irq_unmap,
> +       .xlate = irq_domain_xlate_twocell,
> +};

All this goes away with GPIOLIB_IRQCHIP (that is what is good about it).

> +#ifdef CONFIG_OF_GPIO

What, that should be defined all the time, you depend on it in
Kconfig!

> +static void cygnus_gpio_set_pull(struct cygnus_gpio *cygnus_gpio,
> +                                unsigned gpio, enum gpio_pull pull)
(...)
> +static void cygnus_gpio_set_strength(struct cygnus_gpio *cygnus_gpio,
> +               unsigned gpio, enum gpio_drv_strength strength)
(...)
> +static int cygnus_gpio_of_xlate(struct gpio_chip *gc,
> +               const struct of_phandle_args *gpiospec, u32 *flags)

NAK. This is pin control, put this in the pin control driver.

I guess the same that is part of this patch series.

(...)
> +static int cygnus_gpio_probe(struct platform_device *pdev)
> +{
> +       struct device *dev = &pdev->dev;
> +       struct resource *res;
> +       struct cygnus_gpio *cygnus_gpio;
> +       struct gpio_chip *gc;
> +       u32 i, ngpios;
> +       int ret;
> +
> +       cygnus_gpio = devm_kzalloc(dev, sizeof(*cygnus_gpio), GFP_KERNEL);
> +       if (!cygnus_gpio)
> +               return -ENOMEM;
> +
> +       cygnus_gpio->dev = dev;
> +       platform_set_drvdata(pdev, cygnus_gpio);
> +
> +       if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
> +               dev_err(&pdev->dev, "missing ngpios DT property\n");
> +               return -ENODEV;
> +       }
> +       cygnus_gpio->num_banks = (ngpios + NGPIOS_PER_BANK - 1) /
> +               NGPIOS_PER_BANK;
> +
> +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +       cygnus_gpio->base = devm_ioremap_resource(dev, res);
> +       if (IS_ERR(cygnus_gpio->base)) {
> +               dev_err(&pdev->dev, "unable to map I/O memory\n");
> +               return PTR_ERR(cygnus_gpio->base);
> +       }
> +
> +       /*
> +        * Only certain types of Cygnus GPIO interfaces have I/O control
> +        * registers
> +        */
> +       res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> +       if (res) {
> +               cygnus_gpio->io_ctrl = devm_ioremap_resource(dev, res);
> +               if (IS_ERR(cygnus_gpio->io_ctrl)) {
> +                       dev_err(&pdev->dev, "unable to map I/O memory\n");
> +                       return PTR_ERR(cygnus_gpio->io_ctrl);
> +               }
> +       }

This is a good indication that it's a separate piece of HW and should
be a separate pin control driver.

> +
> +       spin_lock_init(&cygnus_gpio->lock);
> +
> +       gc = &cygnus_gpio->gc;
> +       gc->base = -1;
> +       gc->ngpio = ngpios;
> +       gc->label = dev_name(dev);
> +       gc->dev = dev;
> +#ifdef CONFIG_OF_GPIO

You depend on this symbol.

> +       gc->of_node = dev->of_node;
> +       gc->of_gpio_n_cells = 2;
> +       gc->of_xlate = cygnus_gpio_of_xlate;
> +#endif
> +       gc->direction_input = cygnus_gpio_direction_input;
> +       gc->direction_output = cygnus_gpio_direction_output;
> +       gc->set = cygnus_gpio_set;
> +       gc->get = cygnus_gpio_get;
> +       gc->to_irq = cygnus_gpio_to_irq;
> +
> +       ret = gpiochip_add(gc);
> +       if (ret < 0) {
> +               dev_err(&pdev->dev, "unable to add GPIO chip\n");
> +               return ret;
> +       }
> +
> +       /*
> +        * Some of the GPIO interfaces do not have interrupt wired to the main
> +        * processor
> +        */
> +       cygnus_gpio->irq = platform_get_irq(pdev, 0);
> +       if (cygnus_gpio->irq < 0) {
> +               ret = cygnus_gpio->irq;
> +               if (ret == -EPROBE_DEFER)
> +                       goto err_rm_gpiochip;
> +
> +               dev_info(&pdev->dev, "no interrupt hook\n");
> +       }

>From here:

> +       cygnus_gpio->irq_domain = irq_domain_add_linear(dev->of_node,
> +                       gc->ngpio, &cygnus_irq_ops, cygnus_gpio);
> +       if (!cygnus_gpio->irq_domain) {
> +               dev_err(&pdev->dev, "unable to allocate IRQ domain\n");
> +               ret = -ENXIO;
> +               goto err_rm_gpiochip;
> +       }
> +
> +       for (i = 0; i < gc->ngpio; i++) {
> +               int irq = irq_create_mapping(cygnus_gpio->irq_domain, i);
> +
> +               irq_set_lockdep_class(irq, &gpio_lock_class);
> +               irq_set_chip_data(irq, cygnus_gpio);
> +               irq_set_chip_and_handler(irq, &cygnus_gpio_irq_chip,
> +                               handle_simple_irq);
> +               set_irq_flags(irq, IRQF_VALID);
> +       }
> +
> +       irq_set_chained_handler(cygnus_gpio->irq, cygnus_gpio_irq_handler);
> +       irq_set_handler_data(cygnus_gpio->irq, cygnus_gpio);

To here, replace with a single call to
gpiochip_set_chained_irqchip(chip *, irq_chip *, irq, handler)...

Look at other drivers using GPIOLIB_IRQCHIP for inspiration.

Yours,
Linus Walleij

[PATCH v6 2/3] gpio: Cygnus: add GPIO driver

[Linus Walleij]

On Tue, Dec 16, 2014 at 3:18 AM, Ray Jui <rjui@broadcom.com> wrote:

> This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
> SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller, 2) the
> chipCommonG GPIO controller, and 3) the ALWAYS-ON GPIO controller
>
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>

(Big thanks to Alexandre for doing the major part of the review,
good work with following up so far!)

(...)
> +config GPIO_BCM_CYGNUS
> +       bool "Broadcom Cygnus GPIO support"
> +       depends on ARCH_BCM_CYGNUS && OF_GPIO

select GPIOLIB_IRQCHIP

See more about this below.

> +++ b/drivers/gpio/gpio-bcm-cygnus.c
> @@ -0,0 +1,607 @@
> +/*
> + * Copyright (C) 2014 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/slab.h>
> +#include <linux/module.h>
> +#include <linux/irq.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/gpio.h>
> +#include <linux/ioport.h>
> +#include <linux/of_device.h>
> +#include <linux/of_irq.h>
> +#include <linux/irqchip/chained_irq.h>

Skip <linux/irq.h> and <linux/irqchip/chained_irq.h>
as these move to the core with GPIOLIB_IRQCHIP

> +#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
> +#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
> +#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
> +#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
> +#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
> +#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
> +#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
> +#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
> +#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
> +#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
> +#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
> +#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
> +
> +/* drive strength control for ASIU GPIO */
> +#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
> +
> +/* drive strength control for CCM GPIO */
> +#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00

This stuff (drive strength) is pin control, pin config.
It does not belong in a pure GPIO driver. If you're
making a combined pin control + GPIO driver, it
shall be put in drivers/pinctrl/*

> +#define GPIO_BANK_SIZE 0x200
> +#define NGPIOS_PER_BANK 32
> +#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
> +
> +#define CYGNUS_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + (reg))
> +#define CYGNUS_GPIO_SHIFT(pin) ((pin) % NGPIOS_PER_BANK)
> +
> +#define GPIO_FLAG_BIT_MASK           0xffff
> +#define GPIO_PULL_BIT_SHIFT          16
> +#define GPIO_PULL_BIT_MASK           0x3
> +
> +#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
> +#define GPIO_DRV_STRENGTH_BITS       3
> +#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
> +
> +/*
> + * For GPIO internal pull up/down registers
> + */
> +enum gpio_pull {
> +       GPIO_PULL_NONE = 0,
> +       GPIO_PULL_UP,
> +       GPIO_PULL_DOWN,
> +       GPIO_PULL_INVALID,
> +};
> +
> +/*
> + * GPIO drive strength
> + */
> +enum gpio_drv_strength {
> +       GPIO_DRV_STRENGTH_2MA = 0,
> +       GPIO_DRV_STRENGTH_4MA,
> +       GPIO_DRV_STRENGTH_6MA,
> +       GPIO_DRV_STRENGTH_8MA,
> +       GPIO_DRV_STRENGTH_10MA,
> +       GPIO_DRV_STRENGTH_12MA,
> +       GPIO_DRV_STRENGTH_14MA,
> +       GPIO_DRV_STRENGTH_16MA,
> +       GPIO_DRV_STRENGTH_INVALID,
> +};


All this pull up/down and drive strength is pin config for
the pin control subsystem.

> +struct cygnus_gpio {
> +       struct device *dev;
> +       void __iomem *base;
> +       void __iomem *io_ctrl;
> +       spinlock_t lock;
> +       struct gpio_chip gc;
> +       unsigned num_banks;
> +       int irq;
> +       struct irq_domain *irq_domain;

Skip irq and irqdomain and use GPIOLIB_IRQCHIP

> +static u32 cygnus_readl(struct cygnus_gpio *cygnus_gpio, unsigned int offset)
> +{
> +       return readl(cygnus_gpio->base + offset);
> +}
> +
> +static void cygnus_writel(struct cygnus_gpio *cygnus_gpio,
> +                         unsigned int offset, u32 val)
> +{
> +       writel(val, cygnus_gpio->base + offset);
> +}

I don't see the value of using these accessors over just inlining
your readl/writel stuff.

(...)
> +static int cygnus_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
> +{
> +       struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
> +
> +       return irq_find_mapping(cygnus_gpio->irq_domain, offset);
> +}

This goes away to the core with GPIOLIB_IRQCHIP

> +static void cygnus_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
> +{
> +       struct cygnus_gpio *cygnus_gpio;
> +       struct irq_chip *chip = irq_desc_get_chip(desc);
> +       int i, bit;
> +
> +       chained_irq_enter(chip, desc);
> +
> +       cygnus_gpio = irq_get_handler_data(irq);
> +
> +       /* go through the entire GPIO banks and handle all interrupts */
> +       for (i = 0; i < cygnus_gpio->num_banks; i++) {
> +               unsigned long val = cygnus_readl(cygnus_gpio,
> +                               (i * GPIO_BANK_SIZE) +
> +                               CYGNUS_GPIO_INT_MSTAT_OFFSET);
> +
> +               for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
> +                       unsigned pin = NGPIOS_PER_BANK * i + bit;
> +                       int child_irq =
> +                               cygnus_gpio_to_irq(&cygnus_gpio->gc, pin);
> +
> +                       /*
> +                        * Clear the interrupt before invoking the
> +                        * handler, so we do not leave any window
> +                        */
> +                       cygnus_writel(cygnus_gpio, (i * GPIO_BANK_SIZE) +
> +                               CYGNUS_GPIO_INT_CLR_OFFSET, BIT(bit));
> +
> +                       generic_handle_irq(child_irq);
> +               }
> +       }
> +
> +       chained_irq_exit(chip, desc);
> +}

Looks good, but you will need to have the struct gpio_chip * as
handler data to use GPIOLIB_IRQCHIP, so get from there to
the struct cygnus_gpio something like:

struct gpio_chip *gc = irq_desc_get_handler_data(desc);
struct cygnus_gpio *cyg = to_cygnus_gpio(gc);

> +static int cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
> +{
> +       struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
> +       unsigned int offset = CYGNUS_GPIO_REG(gpio,
> +                       CYGNUS_GPIO_DATA_IN_OFFSET);
> +       unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
> +       u32 val;
> +
> +       val = cygnus_readl(cygnus_gpio, offset);
> +       val = (val >> shift) & 1;

No, do this:

return !!(cygnus_readl(cygnus_gpio, offset) & BIT(shift));

Maybe rename the "shift" variable to "bit" or just use the macro
directly in the readl().

> +static int cygnus_gpio_irq_map(struct irq_domain *d, unsigned int irq,
> +                              irq_hw_number_t hwirq)
> +{
> +       int ret;
> +
> +       ret = irq_set_chip_data(irq, d->host_data);
> +       if (ret < 0)
> +               return ret;
> +       irq_set_lockdep_class(irq, &gpio_lock_class);
> +       irq_set_chip_and_handler(irq, &cygnus_gpio_irq_chip,
> +                       handle_simple_irq);
> +       set_irq_flags(irq, IRQF_VALID);
> +
> +       return 0;
> +}
> +
> +static void cygnus_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
> +{
> +       irq_set_chip_and_handler(irq, NULL, NULL);
> +       irq_set_chip_data(irq, NULL);
> +}
> +
> +static struct irq_domain_ops cygnus_irq_ops = {
> +       .map = cygnus_gpio_irq_map,
> +       .unmap = cygnus_gpio_irq_unmap,
> +       .xlate = irq_domain_xlate_twocell,
> +};

All this goes away with GPIOLIB_IRQCHIP (that is what is good about it).

> +#ifdef CONFIG_OF_GPIO

What, that should be defined all the time, you depend on it in
Kconfig!

> +static void cygnus_gpio_set_pull(struct cygnus_gpio *cygnus_gpio,
> +                                unsigned gpio, enum gpio_pull pull)
(...)
> +static void cygnus_gpio_set_strength(struct cygnus_gpio *cygnus_gpio,
> +               unsigned gpio, enum gpio_drv_strength strength)
(...)
> +static int cygnus_gpio_of_xlate(struct gpio_chip *gc,
> +               const struct of_phandle_args *gpiospec, u32 *flags)

NAK. This is pin control, put this in the pin control driver.

I guess the same that is part of this patch series.

(...)
> +static int cygnus_gpio_probe(struct platform_device *pdev)
> +{
> +       struct device *dev = &pdev->dev;
> +       struct resource *res;
> +       struct cygnus_gpio *cygnus_gpio;
> +       struct gpio_chip *gc;
> +       u32 i, ngpios;
> +       int ret;
> +
> +       cygnus_gpio = devm_kzalloc(dev, sizeof(*cygnus_gpio), GFP_KERNEL);
> +       if (!cygnus_gpio)
> +               return -ENOMEM;
> +
> +       cygnus_gpio->dev = dev;
> +       platform_set_drvdata(pdev, cygnus_gpio);
> +
> +       if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
> +               dev_err(&pdev->dev, "missing ngpios DT property\n");
> +               return -ENODEV;
> +       }
> +       cygnus_gpio->num_banks = (ngpios + NGPIOS_PER_BANK - 1) /
> +               NGPIOS_PER_BANK;
> +
> +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +       cygnus_gpio->base = devm_ioremap_resource(dev, res);
> +       if (IS_ERR(cygnus_gpio->base)) {
> +               dev_err(&pdev->dev, "unable to map I/O memory\n");
> +               return PTR_ERR(cygnus_gpio->base);
> +       }
> +
> +       /*
> +        * Only certain types of Cygnus GPIO interfaces have I/O control
> +        * registers
> +        */
> +       res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> +       if (res) {
> +               cygnus_gpio->io_ctrl = devm_ioremap_resource(dev, res);
> +               if (IS_ERR(cygnus_gpio->io_ctrl)) {
> +                       dev_err(&pdev->dev, "unable to map I/O memory\n");
> +                       return PTR_ERR(cygnus_gpio->io_ctrl);
> +               }
> +       }

This is a good indication that it's a separate piece of HW and should
be a separate pin control driver.

> +
> +       spin_lock_init(&cygnus_gpio->lock);
> +
> +       gc = &cygnus_gpio->gc;
> +       gc->base = -1;
> +       gc->ngpio = ngpios;
> +       gc->label = dev_name(dev);
> +       gc->dev = dev;
> +#ifdef CONFIG_OF_GPIO

You depend on this symbol.

> +       gc->of_node = dev->of_node;
> +       gc->of_gpio_n_cells = 2;
> +       gc->of_xlate = cygnus_gpio_of_xlate;
> +#endif
> +       gc->direction_input = cygnus_gpio_direction_input;
> +       gc->direction_output = cygnus_gpio_direction_output;
> +       gc->set = cygnus_gpio_set;
> +       gc->get = cygnus_gpio_get;
> +       gc->to_irq = cygnus_gpio_to_irq;
> +
> +       ret = gpiochip_add(gc);
> +       if (ret < 0) {
> +               dev_err(&pdev->dev, "unable to add GPIO chip\n");
> +               return ret;
> +       }
> +
> +       /*
> +        * Some of the GPIO interfaces do not have interrupt wired to the main
> +        * processor
> +        */
> +       cygnus_gpio->irq = platform_get_irq(pdev, 0);
> +       if (cygnus_gpio->irq < 0) {
> +               ret = cygnus_gpio->irq;
> +               if (ret == -EPROBE_DEFER)
> +                       goto err_rm_gpiochip;
> +
> +               dev_info(&pdev->dev, "no interrupt hook\n");
> +       }

>From here:

> +       cygnus_gpio->irq_domain = irq_domain_add_linear(dev->of_node,
> +                       gc->ngpio, &cygnus_irq_ops, cygnus_gpio);
> +       if (!cygnus_gpio->irq_domain) {
> +               dev_err(&pdev->dev, "unable to allocate IRQ domain\n");
> +               ret = -ENXIO;
> +               goto err_rm_gpiochip;
> +       }
> +
> +       for (i = 0; i < gc->ngpio; i++) {
> +               int irq = irq_create_mapping(cygnus_gpio->irq_domain, i);
> +
> +               irq_set_lockdep_class(irq, &gpio_lock_class);
> +               irq_set_chip_data(irq, cygnus_gpio);
> +               irq_set_chip_and_handler(irq, &cygnus_gpio_irq_chip,
> +                               handle_simple_irq);
> +               set_irq_flags(irq, IRQF_VALID);
> +       }
> +
> +       irq_set_chained_handler(cygnus_gpio->irq, cygnus_gpio_irq_handler);
> +       irq_set_handler_data(cygnus_gpio->irq, cygnus_gpio);

To here, replace with a single call to
gpiochip_set_chained_irqchip(chip *, irq_chip *, irq, handler)...

Look at other drivers using GPIOLIB_IRQCHIP for inspiration.

Yours,
Linus Walleij

Re: [PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Russell King - ARM Linux]

On Tue, Jan 13, 2015 at 09:06:15AM +0100, Linus Walleij wrote:
> On Wed, Dec 17, 2014 at 11:44 AM, Russell King - ARM Linux
> <linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org> wrote:
> > On Wed, Dec 17, 2014 at 11:45:01AM +0900, Alexandre Courbot wrote:
> >> Actually we are not that far from being able to do completely without
> >> any GPIO number, and maybe that's what we should aim for. I think the
> >> only remaining offender is the sysfs interface.
> >
> > And that is a user API, and there's lots of users of it (eg, on Raspberry
> > Pi platforms.)  So changing it isn't going to be easy - I'd say that it's
> > impractical.
> >
> > What you're suggesting would be like re-numbering Linux syscalls.
> 
> The problem is that right now if we set the .base of a gpio_chip
> to -1 for dynamic allocation of GPIO numbers and we have more
> than one GPIO chip in the system, the numbers basically depend
> on probe order, and may theoretically even differ between two boots.
> 
> So in these cases preserving the ABI means preserving the
> unpredictability of these assigned numbers or something.
> 
> For the old usecases with a single GPIO controller and a fixed
> base offset of e.g. 0 (which I suspect was implicit in the initial
> design of the subsystem) things work fine as always, it's these new
> dynamic use cases that destabilize the ABI.

Since GPIOs are exported through sysfs into userland by GPIO number,
and we know that there are users of it (see
https://github.com/pilight/wiringX) which hard encode GPIO numbers,
so this is *really* something that we as kernel developers can't
change without breaking such users.

So, what I'm saying is be very careful about moving to a fully
dynamic space: you could end up breaking userspace if you do.

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Re: [PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Russell King - ARM Linux]

On Tue, Jan 13, 2015 at 09:06:15AM +0100, Linus Walleij wrote:
> On Wed, Dec 17, 2014 at 11:44 AM, Russell King - ARM Linux
> <linux@arm.linux.org.uk> wrote:
> > On Wed, Dec 17, 2014 at 11:45:01AM +0900, Alexandre Courbot wrote:
> >> Actually we are not that far from being able to do completely without
> >> any GPIO number, and maybe that's what we should aim for. I think the
> >> only remaining offender is the sysfs interface.
> >
> > And that is a user API, and there's lots of users of it (eg, on Raspberry
> > Pi platforms.)  So changing it isn't going to be easy - I'd say that it's
> > impractical.
> >
> > What you're suggesting would be like re-numbering Linux syscalls.
> 
> The problem is that right now if we set the .base of a gpio_chip
> to -1 for dynamic allocation of GPIO numbers and we have more
> than one GPIO chip in the system, the numbers basically depend
> on probe order, and may theoretically even differ between two boots.
> 
> So in these cases preserving the ABI means preserving the
> unpredictability of these assigned numbers or something.
> 
> For the old usecases with a single GPIO controller and a fixed
> base offset of e.g. 0 (which I suspect was implicit in the initial
> design of the subsystem) things work fine as always, it's these new
> dynamic use cases that destabilize the ABI.

Since GPIOs are exported through sysfs into userland by GPIO number,
and we know that there are users of it (see
https://github.com/pilight/wiringX) which hard encode GPIO numbers,
so this is *really* something that we as kernel developers can't
change without breaking such users.

So, what I'm saying is be very careful about moving to a fully
dynamic space: you could end up breaking userspace if you do.

-- 
FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up
according to speedtest.net.

[PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Russell King - ARM Linux]

On Tue, Jan 13, 2015 at 09:06:15AM +0100, Linus Walleij wrote:
> On Wed, Dec 17, 2014 at 11:44 AM, Russell King - ARM Linux
> <linux@arm.linux.org.uk> wrote:
> > On Wed, Dec 17, 2014 at 11:45:01AM +0900, Alexandre Courbot wrote:
> >> Actually we are not that far from being able to do completely without
> >> any GPIO number, and maybe that's what we should aim for. I think the
> >> only remaining offender is the sysfs interface.
> >
> > And that is a user API, and there's lots of users of it (eg, on Raspberry
> > Pi platforms.)  So changing it isn't going to be easy - I'd say that it's
> > impractical.
> >
> > What you're suggesting would be like re-numbering Linux syscalls.
> 
> The problem is that right now if we set the .base of a gpio_chip
> to -1 for dynamic allocation of GPIO numbers and we have more
> than one GPIO chip in the system, the numbers basically depend
> on probe order, and may theoretically even differ between two boots.
> 
> So in these cases preserving the ABI means preserving the
> unpredictability of these assigned numbers or something.
> 
> For the old usecases with a single GPIO controller and a fixed
> base offset of e.g. 0 (which I suspect was implicit in the initial
> design of the subsystem) things work fine as always, it's these new
> dynamic use cases that destabilize the ABI.

Since GPIOs are exported through sysfs into userland by GPIO number,
and we know that there are users of it (see
https://github.com/pilight/wiringX) which hard encode GPIO numbers,
so this is *really* something that we as kernel developers can't
change without breaking such users.

So, what I'm saying is be very careful about moving to a fully
dynamic space: you could end up breaking userspace if you do.

-- 
FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up
according to speedtest.net.

Re: [PATCH v6 2/3] gpio: Cygnus: add GPIO driver

[Ray Jui]

On 1/13/2015 12:53 AM, Linus Walleij wrote:
> On Tue, Dec 16, 2014 at 3:18 AM, Ray Jui <rjui@broadcom.com> wrote:
> 
>> This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
>> SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller, 2) the
>> chipCommonG GPIO controller, and 3) the ALWAYS-ON GPIO controller
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> 
> (Big thanks to Alexandre for doing the major part of the review,
> good work with following up so far!)
> 
> (...)
Yes, reviews from Alex and others are very helpful!

>> +config GPIO_BCM_CYGNUS
>> +       bool "Broadcom Cygnus GPIO support"
>> +       depends on ARCH_BCM_CYGNUS && OF_GPIO
> 
> select GPIOLIB_IRQCHIP
> 
> See more about this below.
> 
>> +++ b/drivers/gpio/gpio-bcm-cygnus.c
>> @@ -0,0 +1,607 @@
>> +/*
>> + * Copyright (C) 2014 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/slab.h>
>> +#include <linux/module.h>
>> +#include <linux/irq.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/io.h>
>> +#include <linux/gpio.h>
>> +#include <linux/ioport.h>
>> +#include <linux/of_device.h>
>> +#include <linux/of_irq.h>
>> +#include <linux/irqchip/chained_irq.h>
> 
> Skip <linux/irq.h> and <linux/irqchip/chained_irq.h>
> as these move to the core with GPIOLIB_IRQCHIP
> 
Will do.

>> +#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
>> +#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
>> +#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
>> +#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
>> +#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
>> +#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
>> +#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
>> +#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
>> +#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
>> +#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
>> +#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
>> +#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
>> +
>> +/* drive strength control for ASIU GPIO */
>> +#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
>> +
>> +/* drive strength control for CCM GPIO */
>> +#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00
> 
> This stuff (drive strength) is pin control, pin config.
> It does not belong in a pure GPIO driver. If you're
> making a combined pin control + GPIO driver, it
> shall be put in drivers/pinctrl/*
> 
Okay, I have some questions here. Are you suggesting me to register this
driver to both the pinctrl subsystem and gpiolib and move it to under
drivers/pinctrl/*? And obviously I should handle all pinctrl related
functions (drive strength, pull up/down, and etc.) using the standard
pinctrl bindings.

Or Are you suggesting me to combine this driver with the other Cygnus
pinctrl driver (which only supports pinmux)?

Note in Cygnus, all pinmux logic is done in the pinmux block. And there
are 3 GPIO controllers, that handle GPIO, drive strength of the GPIO
pins, internal pull up/down of the GPIO pins, which are handled in this
driver. So this driver is generic to all 3 GPIO controllers, as you can
see from the device tree bindings, there are 3 nodes.

Therefore, I think it makes sense to have one pinmux driver that handles
the pinmux block, and one generic pinctrl + gpio driver that handles
functions supported by all 3 GPIO controllers. Does this make sense to you?

>> +#define GPIO_BANK_SIZE 0x200
>> +#define NGPIOS_PER_BANK 32
>> +#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
>> +
>> +#define CYGNUS_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + (reg))
>> +#define CYGNUS_GPIO_SHIFT(pin) ((pin) % NGPIOS_PER_BANK)
>> +
>> +#define GPIO_FLAG_BIT_MASK           0xffff
>> +#define GPIO_PULL_BIT_SHIFT          16
>> +#define GPIO_PULL_BIT_MASK           0x3
>> +
>> +#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
>> +#define GPIO_DRV_STRENGTH_BITS       3
>> +#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
>> +
>> +/*
>> + * For GPIO internal pull up/down registers
>> + */
>> +enum gpio_pull {
>> +       GPIO_PULL_NONE = 0,
>> +       GPIO_PULL_UP,
>> +       GPIO_PULL_DOWN,
>> +       GPIO_PULL_INVALID,
>> +};
>> +
>> +/*
>> + * GPIO drive strength
>> + */
>> +enum gpio_drv_strength {
>> +       GPIO_DRV_STRENGTH_2MA = 0,
>> +       GPIO_DRV_STRENGTH_4MA,
>> +       GPIO_DRV_STRENGTH_6MA,
>> +       GPIO_DRV_STRENGTH_8MA,
>> +       GPIO_DRV_STRENGTH_10MA,
>> +       GPIO_DRV_STRENGTH_12MA,
>> +       GPIO_DRV_STRENGTH_14MA,
>> +       GPIO_DRV_STRENGTH_16MA,
>> +       GPIO_DRV_STRENGTH_INVALID,
>> +};
> 
> 
> All this pull up/down and drive strength is pin config for
> the pin control subsystem.
> 
Yes.

>> +struct cygnus_gpio {
>> +       struct device *dev;
>> +       void __iomem *base;
>> +       void __iomem *io_ctrl;
>> +       spinlock_t lock;
>> +       struct gpio_chip gc;
>> +       unsigned num_banks;
>> +       int irq;
>> +       struct irq_domain *irq_domain;
> 
> Skip irq and irqdomain and use GPIOLIB_IRQCHIP
> 
Will switch to GPIOLIB_IRQCHIP.

>> +static u32 cygnus_readl(struct cygnus_gpio *cygnus_gpio, unsigned int offset)
>> +{
>> +       return readl(cygnus_gpio->base + offset);
>> +}
>> +
>> +static void cygnus_writel(struct cygnus_gpio *cygnus_gpio,
>> +                         unsigned int offset, u32 val)
>> +{
>> +       writel(val, cygnus_gpio->base + offset);
>> +}
> 
> I don't see the value of using these accessors over just inlining
> your readl/writel stuff.
> 
> (...)
Hmmm....I can change this back to simply readl/writel

>> +static int cygnus_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
>> +{
>> +       struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
>> +
>> +       return irq_find_mapping(cygnus_gpio->irq_domain, offset);
>> +}
> 
> This goes away to the core with GPIOLIB_IRQCHIP
> 
Okay, thanks!

>> +static void cygnus_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
>> +{
>> +       struct cygnus_gpio *cygnus_gpio;
>> +       struct irq_chip *chip = irq_desc_get_chip(desc);
>> +       int i, bit;
>> +
>> +       chained_irq_enter(chip, desc);
>> +
>> +       cygnus_gpio = irq_get_handler_data(irq);
>> +
>> +       /* go through the entire GPIO banks and handle all interrupts */
>> +       for (i = 0; i < cygnus_gpio->num_banks; i++) {
>> +               unsigned long val = cygnus_readl(cygnus_gpio,
>> +                               (i * GPIO_BANK_SIZE) +
>> +                               CYGNUS_GPIO_INT_MSTAT_OFFSET);
>> +
>> +               for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
>> +                       unsigned pin = NGPIOS_PER_BANK * i + bit;
>> +                       int child_irq =
>> +                               cygnus_gpio_to_irq(&cygnus_gpio->gc, pin);
>> +
>> +                       /*
>> +                        * Clear the interrupt before invoking the
>> +                        * handler, so we do not leave any window
>> +                        */
>> +                       cygnus_writel(cygnus_gpio, (i * GPIO_BANK_SIZE) +
>> +                               CYGNUS_GPIO_INT_CLR_OFFSET, BIT(bit));
>> +
>> +                       generic_handle_irq(child_irq);
>> +               }
>> +       }
>> +
>> +       chained_irq_exit(chip, desc);
>> +}
> 
> Looks good, but you will need to have the struct gpio_chip * as
> handler data to use GPIOLIB_IRQCHIP, so get from there to
> the struct cygnus_gpio something like:
> 
> struct gpio_chip *gc = irq_desc_get_handler_data(desc);
> struct cygnus_gpio *cyg = to_cygnus_gpio(gc);
> 
Okay thanks!

>> +static int cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
>> +{
>> +       struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
>> +       unsigned int offset = CYGNUS_GPIO_REG(gpio,
>> +                       CYGNUS_GPIO_DATA_IN_OFFSET);
>> +       unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
>> +       u32 val;
>> +
>> +       val = cygnus_readl(cygnus_gpio, offset);
>> +       val = (val >> shift) & 1;
> 
> No, do this:
> 
> return !!(cygnus_readl(cygnus_gpio, offset) & BIT(shift));
> 
> Maybe rename the "shift" variable to "bit" or just use the macro
> directly in the readl().
> 
Will do!

>> +static int cygnus_gpio_irq_map(struct irq_domain *d, unsigned int irq,
>> +                              irq_hw_number_t hwirq)
>> +{
>> +       int ret;
>> +
>> +       ret = irq_set_chip_data(irq, d->host_data);
>> +       if (ret < 0)
>> +               return ret;
>> +       irq_set_lockdep_class(irq, &gpio_lock_class);
>> +       irq_set_chip_and_handler(irq, &cygnus_gpio_irq_chip,
>> +                       handle_simple_irq);
>> +       set_irq_flags(irq, IRQF_VALID);
>> +
>> +       return 0;
>> +}
>> +
>> +static void cygnus_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
>> +{
>> +       irq_set_chip_and_handler(irq, NULL, NULL);
>> +       irq_set_chip_data(irq, NULL);
>> +}
>> +
>> +static struct irq_domain_ops cygnus_irq_ops = {
>> +       .map = cygnus_gpio_irq_map,
>> +       .unmap = cygnus_gpio_irq_unmap,
>> +       .xlate = irq_domain_xlate_twocell,
>> +};
> 
> All this goes away with GPIOLIB_IRQCHIP (that is what is good about it).
> 
Great!

>> +#ifdef CONFIG_OF_GPIO
> 
> What, that should be defined all the time, you depend on it in
> Kconfig!
> 
Yes. Will get rid of this

>> +static void cygnus_gpio_set_pull(struct cygnus_gpio *cygnus_gpio,
>> +                                unsigned gpio, enum gpio_pull pull)
> (...)
>> +static void cygnus_gpio_set_strength(struct cygnus_gpio *cygnus_gpio,
>> +               unsigned gpio, enum gpio_drv_strength strength)
> (...)
>> +static int cygnus_gpio_of_xlate(struct gpio_chip *gc,
>> +               const struct of_phandle_args *gpiospec, u32 *flags)
> 
> NAK. This is pin control, put this in the pin control driver.
> 
> I guess the same that is part of this patch series.
> 
> (...)
Agreed.

>> +static int cygnus_gpio_probe(struct platform_device *pdev)
>> +{
>> +       struct device *dev = &pdev->dev;
>> +       struct resource *res;
>> +       struct cygnus_gpio *cygnus_gpio;
>> +       struct gpio_chip *gc;
>> +       u32 i, ngpios;
>> +       int ret;
>> +
>> +       cygnus_gpio = devm_kzalloc(dev, sizeof(*cygnus_gpio), GFP_KERNEL);
>> +       if (!cygnus_gpio)
>> +               return -ENOMEM;
>> +
>> +       cygnus_gpio->dev = dev;
>> +       platform_set_drvdata(pdev, cygnus_gpio);
>> +
>> +       if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
>> +               dev_err(&pdev->dev, "missing ngpios DT property\n");
>> +               return -ENODEV;
>> +       }
>> +       cygnus_gpio->num_banks = (ngpios + NGPIOS_PER_BANK - 1) /
>> +               NGPIOS_PER_BANK;
>> +
>> +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +       cygnus_gpio->base = devm_ioremap_resource(dev, res);
>> +       if (IS_ERR(cygnus_gpio->base)) {
>> +               dev_err(&pdev->dev, "unable to map I/O memory\n");
>> +               return PTR_ERR(cygnus_gpio->base);
>> +       }
>> +
>> +       /*
>> +        * Only certain types of Cygnus GPIO interfaces have I/O control
>> +        * registers
>> +        */
>> +       res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
>> +       if (res) {
>> +               cygnus_gpio->io_ctrl = devm_ioremap_resource(dev, res);
>> +               if (IS_ERR(cygnus_gpio->io_ctrl)) {
>> +                       dev_err(&pdev->dev, "unable to map I/O memory\n");
>> +                       return PTR_ERR(cygnus_gpio->io_ctrl);
>> +               }
>> +       }
> 
> This is a good indication that it's a separate piece of HW and should
> be a separate pin control driver.
> 
Okay.

>> +
>> +       spin_lock_init(&cygnus_gpio->lock);
>> +
>> +       gc = &cygnus_gpio->gc;
>> +       gc->base = -1;
>> +       gc->ngpio = ngpios;
>> +       gc->label = dev_name(dev);
>> +       gc->dev = dev;
>> +#ifdef CONFIG_OF_GPIO
> 
> You depend on this symbol.
> 
Will get rid of it.

>> +       gc->of_node = dev->of_node;
>> +       gc->of_gpio_n_cells = 2;
>> +       gc->of_xlate = cygnus_gpio_of_xlate;
>> +#endif
>> +       gc->direction_input = cygnus_gpio_direction_input;
>> +       gc->direction_output = cygnus_gpio_direction_output;
>> +       gc->set = cygnus_gpio_set;
>> +       gc->get = cygnus_gpio_get;
>> +       gc->to_irq = cygnus_gpio_to_irq;
>> +
>> +       ret = gpiochip_add(gc);
>> +       if (ret < 0) {
>> +               dev_err(&pdev->dev, "unable to add GPIO chip\n");
>> +               return ret;
>> +       }
>> +
>> +       /*
>> +        * Some of the GPIO interfaces do not have interrupt wired to the main
>> +        * processor
>> +        */
>> +       cygnus_gpio->irq = platform_get_irq(pdev, 0);
>> +       if (cygnus_gpio->irq < 0) {
>> +               ret = cygnus_gpio->irq;
>> +               if (ret == -EPROBE_DEFER)
>> +                       goto err_rm_gpiochip;
>> +
>> +               dev_info(&pdev->dev, "no interrupt hook\n");
>> +       }
> 
> From here:
> 
>> +       cygnus_gpio->irq_domain = irq_domain_add_linear(dev->of_node,
>> +                       gc->ngpio, &cygnus_irq_ops, cygnus_gpio);
>> +       if (!cygnus_gpio->irq_domain) {
>> +               dev_err(&pdev->dev, "unable to allocate IRQ domain\n");
>> +               ret = -ENXIO;
>> +               goto err_rm_gpiochip;
>> +       }
>> +
>> +       for (i = 0; i < gc->ngpio; i++) {
>> +               int irq = irq_create_mapping(cygnus_gpio->irq_domain, i);
>> +
>> +               irq_set_lockdep_class(irq, &gpio_lock_class);
>> +               irq_set_chip_data(irq, cygnus_gpio);
>> +               irq_set_chip_and_handler(irq, &cygnus_gpio_irq_chip,
>> +                               handle_simple_irq);
>> +               set_irq_flags(irq, IRQF_VALID);
>> +       }
>> +
>> +       irq_set_chained_handler(cygnus_gpio->irq, cygnus_gpio_irq_handler);
>> +       irq_set_handler_data(cygnus_gpio->irq, cygnus_gpio);
> 
> To here, replace with a single call to
> gpiochip_set_chained_irqchip(chip *, irq_chip *, irq, handler)...
This is excellent! Thanks!

> 
> Look at other drivers using GPIOLIB_IRQCHIP for inspiration.
> 
> Yours,
> Linus Walleij
> 

Re: [PATCH v6 2/3] gpio: Cygnus: add GPIO driver

[Ray Jui]

On 1/13/2015 12:53 AM, Linus Walleij wrote:
> On Tue, Dec 16, 2014 at 3:18 AM, Ray Jui <rjui@broadcom.com> wrote:
> 
>> This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
>> SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller, 2) the
>> chipCommonG GPIO controller, and 3) the ALWAYS-ON GPIO controller
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> 
> (Big thanks to Alexandre for doing the major part of the review,
> good work with following up so far!)
> 
> (...)
Yes, reviews from Alex and others are very helpful!

>> +config GPIO_BCM_CYGNUS
>> +       bool "Broadcom Cygnus GPIO support"
>> +       depends on ARCH_BCM_CYGNUS && OF_GPIO
> 
> select GPIOLIB_IRQCHIP
> 
> See more about this below.
> 
>> +++ b/drivers/gpio/gpio-bcm-cygnus.c
>> @@ -0,0 +1,607 @@
>> +/*
>> + * Copyright (C) 2014 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/slab.h>
>> +#include <linux/module.h>
>> +#include <linux/irq.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/io.h>
>> +#include <linux/gpio.h>
>> +#include <linux/ioport.h>
>> +#include <linux/of_device.h>
>> +#include <linux/of_irq.h>
>> +#include <linux/irqchip/chained_irq.h>
> 
> Skip <linux/irq.h> and <linux/irqchip/chained_irq.h>
> as these move to the core with GPIOLIB_IRQCHIP
> 
Will do.

>> +#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
>> +#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
>> +#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
>> +#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
>> +#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
>> +#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
>> +#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
>> +#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
>> +#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
>> +#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
>> +#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
>> +#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
>> +
>> +/* drive strength control for ASIU GPIO */
>> +#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
>> +
>> +/* drive strength control for CCM GPIO */
>> +#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00
> 
> This stuff (drive strength) is pin control, pin config.
> It does not belong in a pure GPIO driver. If you're
> making a combined pin control + GPIO driver, it
> shall be put in drivers/pinctrl/*
> 
Okay, I have some questions here. Are you suggesting me to register this
driver to both the pinctrl subsystem and gpiolib and move it to under
drivers/pinctrl/*? And obviously I should handle all pinctrl related
functions (drive strength, pull up/down, and etc.) using the standard
pinctrl bindings.

Or Are you suggesting me to combine this driver with the other Cygnus
pinctrl driver (which only supports pinmux)?

Note in Cygnus, all pinmux logic is done in the pinmux block. And there
are 3 GPIO controllers, that handle GPIO, drive strength of the GPIO
pins, internal pull up/down of the GPIO pins, which are handled in this
driver. So this driver is generic to all 3 GPIO controllers, as you can
see from the device tree bindings, there are 3 nodes.

Therefore, I think it makes sense to have one pinmux driver that handles
the pinmux block, and one generic pinctrl + gpio driver that handles
functions supported by all 3 GPIO controllers. Does this make sense to you?

>> +#define GPIO_BANK_SIZE 0x200
>> +#define NGPIOS_PER_BANK 32
>> +#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
>> +
>> +#define CYGNUS_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + (reg))
>> +#define CYGNUS_GPIO_SHIFT(pin) ((pin) % NGPIOS_PER_BANK)
>> +
>> +#define GPIO_FLAG_BIT_MASK           0xffff
>> +#define GPIO_PULL_BIT_SHIFT          16
>> +#define GPIO_PULL_BIT_MASK           0x3
>> +
>> +#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
>> +#define GPIO_DRV_STRENGTH_BITS       3
>> +#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
>> +
>> +/*
>> + * For GPIO internal pull up/down registers
>> + */
>> +enum gpio_pull {
>> +       GPIO_PULL_NONE = 0,
>> +       GPIO_PULL_UP,
>> +       GPIO_PULL_DOWN,
>> +       GPIO_PULL_INVALID,
>> +};
>> +
>> +/*
>> + * GPIO drive strength
>> + */
>> +enum gpio_drv_strength {
>> +       GPIO_DRV_STRENGTH_2MA = 0,
>> +       GPIO_DRV_STRENGTH_4MA,
>> +       GPIO_DRV_STRENGTH_6MA,
>> +       GPIO_DRV_STRENGTH_8MA,
>> +       GPIO_DRV_STRENGTH_10MA,
>> +       GPIO_DRV_STRENGTH_12MA,
>> +       GPIO_DRV_STRENGTH_14MA,
>> +       GPIO_DRV_STRENGTH_16MA,
>> +       GPIO_DRV_STRENGTH_INVALID,
>> +};
> 
> 
> All this pull up/down and drive strength is pin config for
> the pin control subsystem.
> 
Yes.

>> +struct cygnus_gpio {
>> +       struct device *dev;
>> +       void __iomem *base;
>> +       void __iomem *io_ctrl;
>> +       spinlock_t lock;
>> +       struct gpio_chip gc;
>> +       unsigned num_banks;
>> +       int irq;
>> +       struct irq_domain *irq_domain;
> 
> Skip irq and irqdomain and use GPIOLIB_IRQCHIP
> 
Will switch to GPIOLIB_IRQCHIP.

>> +static u32 cygnus_readl(struct cygnus_gpio *cygnus_gpio, unsigned int offset)
>> +{
>> +       return readl(cygnus_gpio->base + offset);
>> +}
>> +
>> +static void cygnus_writel(struct cygnus_gpio *cygnus_gpio,
>> +                         unsigned int offset, u32 val)
>> +{
>> +       writel(val, cygnus_gpio->base + offset);
>> +}
> 
> I don't see the value of using these accessors over just inlining
> your readl/writel stuff.
> 
> (...)
Hmmm....I can change this back to simply readl/writel

>> +static int cygnus_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
>> +{
>> +       struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
>> +
>> +       return irq_find_mapping(cygnus_gpio->irq_domain, offset);
>> +}
> 
> This goes away to the core with GPIOLIB_IRQCHIP
> 
Okay, thanks!

>> +static void cygnus_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
>> +{
>> +       struct cygnus_gpio *cygnus_gpio;
>> +       struct irq_chip *chip = irq_desc_get_chip(desc);
>> +       int i, bit;
>> +
>> +       chained_irq_enter(chip, desc);
>> +
>> +       cygnus_gpio = irq_get_handler_data(irq);
>> +
>> +       /* go through the entire GPIO banks and handle all interrupts */
>> +       for (i = 0; i < cygnus_gpio->num_banks; i++) {
>> +               unsigned long val = cygnus_readl(cygnus_gpio,
>> +                               (i * GPIO_BANK_SIZE) +
>> +                               CYGNUS_GPIO_INT_MSTAT_OFFSET);
>> +
>> +               for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
>> +                       unsigned pin = NGPIOS_PER_BANK * i + bit;
>> +                       int child_irq =
>> +                               cygnus_gpio_to_irq(&cygnus_gpio->gc, pin);
>> +
>> +                       /*
>> +                        * Clear the interrupt before invoking the
>> +                        * handler, so we do not leave any window
>> +                        */
>> +                       cygnus_writel(cygnus_gpio, (i * GPIO_BANK_SIZE) +
>> +                               CYGNUS_GPIO_INT_CLR_OFFSET, BIT(bit));
>> +
>> +                       generic_handle_irq(child_irq);
>> +               }
>> +       }
>> +
>> +       chained_irq_exit(chip, desc);
>> +}
> 
> Looks good, but you will need to have the struct gpio_chip * as
> handler data to use GPIOLIB_IRQCHIP, so get from there to
> the struct cygnus_gpio something like:
> 
> struct gpio_chip *gc = irq_desc_get_handler_data(desc);
> struct cygnus_gpio *cyg = to_cygnus_gpio(gc);
> 
Okay thanks!

>> +static int cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
>> +{
>> +       struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
>> +       unsigned int offset = CYGNUS_GPIO_REG(gpio,
>> +                       CYGNUS_GPIO_DATA_IN_OFFSET);
>> +       unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
>> +       u32 val;
>> +
>> +       val = cygnus_readl(cygnus_gpio, offset);
>> +       val = (val >> shift) & 1;
> 
> No, do this:
> 
> return !!(cygnus_readl(cygnus_gpio, offset) & BIT(shift));
> 
> Maybe rename the "shift" variable to "bit" or just use the macro
> directly in the readl().
> 
Will do!

>> +static int cygnus_gpio_irq_map(struct irq_domain *d, unsigned int irq,
>> +                              irq_hw_number_t hwirq)
>> +{
>> +       int ret;
>> +
>> +       ret = irq_set_chip_data(irq, d->host_data);
>> +       if (ret < 0)
>> +               return ret;
>> +       irq_set_lockdep_class(irq, &gpio_lock_class);
>> +       irq_set_chip_and_handler(irq, &cygnus_gpio_irq_chip,
>> +                       handle_simple_irq);
>> +       set_irq_flags(irq, IRQF_VALID);
>> +
>> +       return 0;
>> +}
>> +
>> +static void cygnus_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
>> +{
>> +       irq_set_chip_and_handler(irq, NULL, NULL);
>> +       irq_set_chip_data(irq, NULL);
>> +}
>> +
>> +static struct irq_domain_ops cygnus_irq_ops = {
>> +       .map = cygnus_gpio_irq_map,
>> +       .unmap = cygnus_gpio_irq_unmap,
>> +       .xlate = irq_domain_xlate_twocell,
>> +};
> 
> All this goes away with GPIOLIB_IRQCHIP (that is what is good about it).
> 
Great!

>> +#ifdef CONFIG_OF_GPIO
> 
> What, that should be defined all the time, you depend on it in
> Kconfig!
> 
Yes. Will get rid of this

>> +static void cygnus_gpio_set_pull(struct cygnus_gpio *cygnus_gpio,
>> +                                unsigned gpio, enum gpio_pull pull)
> (...)
>> +static void cygnus_gpio_set_strength(struct cygnus_gpio *cygnus_gpio,
>> +               unsigned gpio, enum gpio_drv_strength strength)
> (...)
>> +static int cygnus_gpio_of_xlate(struct gpio_chip *gc,
>> +               const struct of_phandle_args *gpiospec, u32 *flags)
> 
> NAK. This is pin control, put this in the pin control driver.
> 
> I guess the same that is part of this patch series.
> 
> (...)
Agreed.

>> +static int cygnus_gpio_probe(struct platform_device *pdev)
>> +{
>> +       struct device *dev = &pdev->dev;
>> +       struct resource *res;
>> +       struct cygnus_gpio *cygnus_gpio;
>> +       struct gpio_chip *gc;
>> +       u32 i, ngpios;
>> +       int ret;
>> +
>> +       cygnus_gpio = devm_kzalloc(dev, sizeof(*cygnus_gpio), GFP_KERNEL);
>> +       if (!cygnus_gpio)
>> +               return -ENOMEM;
>> +
>> +       cygnus_gpio->dev = dev;
>> +       platform_set_drvdata(pdev, cygnus_gpio);
>> +
>> +       if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
>> +               dev_err(&pdev->dev, "missing ngpios DT property\n");
>> +               return -ENODEV;
>> +       }
>> +       cygnus_gpio->num_banks = (ngpios + NGPIOS_PER_BANK - 1) /
>> +               NGPIOS_PER_BANK;
>> +
>> +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +       cygnus_gpio->base = devm_ioremap_resource(dev, res);
>> +       if (IS_ERR(cygnus_gpio->base)) {
>> +               dev_err(&pdev->dev, "unable to map I/O memory\n");
>> +               return PTR_ERR(cygnus_gpio->base);
>> +       }
>> +
>> +       /*
>> +        * Only certain types of Cygnus GPIO interfaces have I/O control
>> +        * registers
>> +        */
>> +       res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
>> +       if (res) {
>> +               cygnus_gpio->io_ctrl = devm_ioremap_resource(dev, res);
>> +               if (IS_ERR(cygnus_gpio->io_ctrl)) {
>> +                       dev_err(&pdev->dev, "unable to map I/O memory\n");
>> +                       return PTR_ERR(cygnus_gpio->io_ctrl);
>> +               }
>> +       }
> 
> This is a good indication that it's a separate piece of HW and should
> be a separate pin control driver.
> 
Okay.

>> +
>> +       spin_lock_init(&cygnus_gpio->lock);
>> +
>> +       gc = &cygnus_gpio->gc;
>> +       gc->base = -1;
>> +       gc->ngpio = ngpios;
>> +       gc->label = dev_name(dev);
>> +       gc->dev = dev;
>> +#ifdef CONFIG_OF_GPIO
> 
> You depend on this symbol.
> 
Will get rid of it.

>> +       gc->of_node = dev->of_node;
>> +       gc->of_gpio_n_cells = 2;
>> +       gc->of_xlate = cygnus_gpio_of_xlate;
>> +#endif
>> +       gc->direction_input = cygnus_gpio_direction_input;
>> +       gc->direction_output = cygnus_gpio_direction_output;
>> +       gc->set = cygnus_gpio_set;
>> +       gc->get = cygnus_gpio_get;
>> +       gc->to_irq = cygnus_gpio_to_irq;
>> +
>> +       ret = gpiochip_add(gc);
>> +       if (ret < 0) {
>> +               dev_err(&pdev->dev, "unable to add GPIO chip\n");
>> +               return ret;
>> +       }
>> +
>> +       /*
>> +        * Some of the GPIO interfaces do not have interrupt wired to the main
>> +        * processor
>> +        */
>> +       cygnus_gpio->irq = platform_get_irq(pdev, 0);
>> +       if (cygnus_gpio->irq < 0) {
>> +               ret = cygnus_gpio->irq;
>> +               if (ret == -EPROBE_DEFER)
>> +                       goto err_rm_gpiochip;
>> +
>> +               dev_info(&pdev->dev, "no interrupt hook\n");
>> +       }
> 
> From here:
> 
>> +       cygnus_gpio->irq_domain = irq_domain_add_linear(dev->of_node,
>> +                       gc->ngpio, &cygnus_irq_ops, cygnus_gpio);
>> +       if (!cygnus_gpio->irq_domain) {
>> +               dev_err(&pdev->dev, "unable to allocate IRQ domain\n");
>> +               ret = -ENXIO;
>> +               goto err_rm_gpiochip;
>> +       }
>> +
>> +       for (i = 0; i < gc->ngpio; i++) {
>> +               int irq = irq_create_mapping(cygnus_gpio->irq_domain, i);
>> +
>> +               irq_set_lockdep_class(irq, &gpio_lock_class);
>> +               irq_set_chip_data(irq, cygnus_gpio);
>> +               irq_set_chip_and_handler(irq, &cygnus_gpio_irq_chip,
>> +                               handle_simple_irq);
>> +               set_irq_flags(irq, IRQF_VALID);
>> +       }
>> +
>> +       irq_set_chained_handler(cygnus_gpio->irq, cygnus_gpio_irq_handler);
>> +       irq_set_handler_data(cygnus_gpio->irq, cygnus_gpio);
> 
> To here, replace with a single call to
> gpiochip_set_chained_irqchip(chip *, irq_chip *, irq, handler)...
This is excellent! Thanks!

> 
> Look at other drivers using GPIOLIB_IRQCHIP for inspiration.
> 
> Yours,
> Linus Walleij
> 

[PATCH v6 2/3] gpio: Cygnus: add GPIO driver

[Ray Jui]

On 1/13/2015 12:53 AM, Linus Walleij wrote:
> On Tue, Dec 16, 2014 at 3:18 AM, Ray Jui <rjui@broadcom.com> wrote:
> 
>> This GPIO driver supports all 3 GPIO controllers in the Broadcom Cygnus
>> SoC. The 3 GPIO controllers are 1) the ASIU GPIO controller, 2) the
>> chipCommonG GPIO controller, and 3) the ALWAYS-ON GPIO controller
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> 
> (Big thanks to Alexandre for doing the major part of the review,
> good work with following up so far!)
> 
> (...)
Yes, reviews from Alex and others are very helpful!

>> +config GPIO_BCM_CYGNUS
>> +       bool "Broadcom Cygnus GPIO support"
>> +       depends on ARCH_BCM_CYGNUS && OF_GPIO
> 
> select GPIOLIB_IRQCHIP
> 
> See more about this below.
> 
>> +++ b/drivers/gpio/gpio-bcm-cygnus.c
>> @@ -0,0 +1,607 @@
>> +/*
>> + * Copyright (C) 2014 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/slab.h>
>> +#include <linux/module.h>
>> +#include <linux/irq.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/io.h>
>> +#include <linux/gpio.h>
>> +#include <linux/ioport.h>
>> +#include <linux/of_device.h>
>> +#include <linux/of_irq.h>
>> +#include <linux/irqchip/chained_irq.h>
> 
> Skip <linux/irq.h> and <linux/irqchip/chained_irq.h>
> as these move to the core with GPIOLIB_IRQCHIP
> 
Will do.

>> +#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
>> +#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
>> +#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
>> +#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
>> +#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
>> +#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
>> +#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
>> +#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
>> +#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
>> +#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
>> +#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
>> +#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
>> +
>> +/* drive strength control for ASIU GPIO */
>> +#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
>> +
>> +/* drive strength control for CCM GPIO */
>> +#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00
> 
> This stuff (drive strength) is pin control, pin config.
> It does not belong in a pure GPIO driver. If you're
> making a combined pin control + GPIO driver, it
> shall be put in drivers/pinctrl/*
> 
Okay, I have some questions here. Are you suggesting me to register this
driver to both the pinctrl subsystem and gpiolib and move it to under
drivers/pinctrl/*? And obviously I should handle all pinctrl related
functions (drive strength, pull up/down, and etc.) using the standard
pinctrl bindings.

Or Are you suggesting me to combine this driver with the other Cygnus
pinctrl driver (which only supports pinmux)?

Note in Cygnus, all pinmux logic is done in the pinmux block. And there
are 3 GPIO controllers, that handle GPIO, drive strength of the GPIO
pins, internal pull up/down of the GPIO pins, which are handled in this
driver. So this driver is generic to all 3 GPIO controllers, as you can
see from the device tree bindings, there are 3 nodes.

Therefore, I think it makes sense to have one pinmux driver that handles
the pinmux block, and one generic pinctrl + gpio driver that handles
functions supported by all 3 GPIO controllers. Does this make sense to you?

>> +#define GPIO_BANK_SIZE 0x200
>> +#define NGPIOS_PER_BANK 32
>> +#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
>> +
>> +#define CYGNUS_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + (reg))
>> +#define CYGNUS_GPIO_SHIFT(pin) ((pin) % NGPIOS_PER_BANK)
>> +
>> +#define GPIO_FLAG_BIT_MASK           0xffff
>> +#define GPIO_PULL_BIT_SHIFT          16
>> +#define GPIO_PULL_BIT_MASK           0x3
>> +
>> +#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
>> +#define GPIO_DRV_STRENGTH_BITS       3
>> +#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
>> +
>> +/*
>> + * For GPIO internal pull up/down registers
>> + */
>> +enum gpio_pull {
>> +       GPIO_PULL_NONE = 0,
>> +       GPIO_PULL_UP,
>> +       GPIO_PULL_DOWN,
>> +       GPIO_PULL_INVALID,
>> +};
>> +
>> +/*
>> + * GPIO drive strength
>> + */
>> +enum gpio_drv_strength {
>> +       GPIO_DRV_STRENGTH_2MA = 0,
>> +       GPIO_DRV_STRENGTH_4MA,
>> +       GPIO_DRV_STRENGTH_6MA,
>> +       GPIO_DRV_STRENGTH_8MA,
>> +       GPIO_DRV_STRENGTH_10MA,
>> +       GPIO_DRV_STRENGTH_12MA,
>> +       GPIO_DRV_STRENGTH_14MA,
>> +       GPIO_DRV_STRENGTH_16MA,
>> +       GPIO_DRV_STRENGTH_INVALID,
>> +};
> 
> 
> All this pull up/down and drive strength is pin config for
> the pin control subsystem.
> 
Yes.

>> +struct cygnus_gpio {
>> +       struct device *dev;
>> +       void __iomem *base;
>> +       void __iomem *io_ctrl;
>> +       spinlock_t lock;
>> +       struct gpio_chip gc;
>> +       unsigned num_banks;
>> +       int irq;
>> +       struct irq_domain *irq_domain;
> 
> Skip irq and irqdomain and use GPIOLIB_IRQCHIP
> 
Will switch to GPIOLIB_IRQCHIP.

>> +static u32 cygnus_readl(struct cygnus_gpio *cygnus_gpio, unsigned int offset)
>> +{
>> +       return readl(cygnus_gpio->base + offset);
>> +}
>> +
>> +static void cygnus_writel(struct cygnus_gpio *cygnus_gpio,
>> +                         unsigned int offset, u32 val)
>> +{
>> +       writel(val, cygnus_gpio->base + offset);
>> +}
> 
> I don't see the value of using these accessors over just inlining
> your readl/writel stuff.
> 
> (...)
Hmmm....I can change this back to simply readl/writel

>> +static int cygnus_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
>> +{
>> +       struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
>> +
>> +       return irq_find_mapping(cygnus_gpio->irq_domain, offset);
>> +}
> 
> This goes away to the core with GPIOLIB_IRQCHIP
> 
Okay, thanks!

>> +static void cygnus_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
>> +{
>> +       struct cygnus_gpio *cygnus_gpio;
>> +       struct irq_chip *chip = irq_desc_get_chip(desc);
>> +       int i, bit;
>> +
>> +       chained_irq_enter(chip, desc);
>> +
>> +       cygnus_gpio = irq_get_handler_data(irq);
>> +
>> +       /* go through the entire GPIO banks and handle all interrupts */
>> +       for (i = 0; i < cygnus_gpio->num_banks; i++) {
>> +               unsigned long val = cygnus_readl(cygnus_gpio,
>> +                               (i * GPIO_BANK_SIZE) +
>> +                               CYGNUS_GPIO_INT_MSTAT_OFFSET);
>> +
>> +               for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
>> +                       unsigned pin = NGPIOS_PER_BANK * i + bit;
>> +                       int child_irq =
>> +                               cygnus_gpio_to_irq(&cygnus_gpio->gc, pin);
>> +
>> +                       /*
>> +                        * Clear the interrupt before invoking the
>> +                        * handler, so we do not leave any window
>> +                        */
>> +                       cygnus_writel(cygnus_gpio, (i * GPIO_BANK_SIZE) +
>> +                               CYGNUS_GPIO_INT_CLR_OFFSET, BIT(bit));
>> +
>> +                       generic_handle_irq(child_irq);
>> +               }
>> +       }
>> +
>> +       chained_irq_exit(chip, desc);
>> +}
> 
> Looks good, but you will need to have the struct gpio_chip * as
> handler data to use GPIOLIB_IRQCHIP, so get from there to
> the struct cygnus_gpio something like:
> 
> struct gpio_chip *gc = irq_desc_get_handler_data(desc);
> struct cygnus_gpio *cyg = to_cygnus_gpio(gc);
> 
Okay thanks!

>> +static int cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
>> +{
>> +       struct cygnus_gpio *cygnus_gpio = to_cygnus_gpio(gc);
>> +       unsigned int offset = CYGNUS_GPIO_REG(gpio,
>> +                       CYGNUS_GPIO_DATA_IN_OFFSET);
>> +       unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
>> +       u32 val;
>> +
>> +       val = cygnus_readl(cygnus_gpio, offset);
>> +       val = (val >> shift) & 1;
> 
> No, do this:
> 
> return !!(cygnus_readl(cygnus_gpio, offset) & BIT(shift));
> 
> Maybe rename the "shift" variable to "bit" or just use the macro
> directly in the readl().
> 
Will do!

>> +static int cygnus_gpio_irq_map(struct irq_domain *d, unsigned int irq,
>> +                              irq_hw_number_t hwirq)
>> +{
>> +       int ret;
>> +
>> +       ret = irq_set_chip_data(irq, d->host_data);
>> +       if (ret < 0)
>> +               return ret;
>> +       irq_set_lockdep_class(irq, &gpio_lock_class);
>> +       irq_set_chip_and_handler(irq, &cygnus_gpio_irq_chip,
>> +                       handle_simple_irq);
>> +       set_irq_flags(irq, IRQF_VALID);
>> +
>> +       return 0;
>> +}
>> +
>> +static void cygnus_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
>> +{
>> +       irq_set_chip_and_handler(irq, NULL, NULL);
>> +       irq_set_chip_data(irq, NULL);
>> +}
>> +
>> +static struct irq_domain_ops cygnus_irq_ops = {
>> +       .map = cygnus_gpio_irq_map,
>> +       .unmap = cygnus_gpio_irq_unmap,
>> +       .xlate = irq_domain_xlate_twocell,
>> +};
> 
> All this goes away with GPIOLIB_IRQCHIP (that is what is good about it).
> 
Great!

>> +#ifdef CONFIG_OF_GPIO
> 
> What, that should be defined all the time, you depend on it in
> Kconfig!
> 
Yes. Will get rid of this

>> +static void cygnus_gpio_set_pull(struct cygnus_gpio *cygnus_gpio,
>> +                                unsigned gpio, enum gpio_pull pull)
> (...)
>> +static void cygnus_gpio_set_strength(struct cygnus_gpio *cygnus_gpio,
>> +               unsigned gpio, enum gpio_drv_strength strength)
> (...)
>> +static int cygnus_gpio_of_xlate(struct gpio_chip *gc,
>> +               const struct of_phandle_args *gpiospec, u32 *flags)
> 
> NAK. This is pin control, put this in the pin control driver.
> 
> I guess the same that is part of this patch series.
> 
> (...)
Agreed.

>> +static int cygnus_gpio_probe(struct platform_device *pdev)
>> +{
>> +       struct device *dev = &pdev->dev;
>> +       struct resource *res;
>> +       struct cygnus_gpio *cygnus_gpio;
>> +       struct gpio_chip *gc;
>> +       u32 i, ngpios;
>> +       int ret;
>> +
>> +       cygnus_gpio = devm_kzalloc(dev, sizeof(*cygnus_gpio), GFP_KERNEL);
>> +       if (!cygnus_gpio)
>> +               return -ENOMEM;
>> +
>> +       cygnus_gpio->dev = dev;
>> +       platform_set_drvdata(pdev, cygnus_gpio);
>> +
>> +       if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
>> +               dev_err(&pdev->dev, "missing ngpios DT property\n");
>> +               return -ENODEV;
>> +       }
>> +       cygnus_gpio->num_banks = (ngpios + NGPIOS_PER_BANK - 1) /
>> +               NGPIOS_PER_BANK;
>> +
>> +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +       cygnus_gpio->base = devm_ioremap_resource(dev, res);
>> +       if (IS_ERR(cygnus_gpio->base)) {
>> +               dev_err(&pdev->dev, "unable to map I/O memory\n");
>> +               return PTR_ERR(cygnus_gpio->base);
>> +       }
>> +
>> +       /*
>> +        * Only certain types of Cygnus GPIO interfaces have I/O control
>> +        * registers
>> +        */
>> +       res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
>> +       if (res) {
>> +               cygnus_gpio->io_ctrl = devm_ioremap_resource(dev, res);
>> +               if (IS_ERR(cygnus_gpio->io_ctrl)) {
>> +                       dev_err(&pdev->dev, "unable to map I/O memory\n");
>> +                       return PTR_ERR(cygnus_gpio->io_ctrl);
>> +               }
>> +       }
> 
> This is a good indication that it's a separate piece of HW and should
> be a separate pin control driver.
> 
Okay.

>> +
>> +       spin_lock_init(&cygnus_gpio->lock);
>> +
>> +       gc = &cygnus_gpio->gc;
>> +       gc->base = -1;
>> +       gc->ngpio = ngpios;
>> +       gc->label = dev_name(dev);
>> +       gc->dev = dev;
>> +#ifdef CONFIG_OF_GPIO
> 
> You depend on this symbol.
> 
Will get rid of it.

>> +       gc->of_node = dev->of_node;
>> +       gc->of_gpio_n_cells = 2;
>> +       gc->of_xlate = cygnus_gpio_of_xlate;
>> +#endif
>> +       gc->direction_input = cygnus_gpio_direction_input;
>> +       gc->direction_output = cygnus_gpio_direction_output;
>> +       gc->set = cygnus_gpio_set;
>> +       gc->get = cygnus_gpio_get;
>> +       gc->to_irq = cygnus_gpio_to_irq;
>> +
>> +       ret = gpiochip_add(gc);
>> +       if (ret < 0) {
>> +               dev_err(&pdev->dev, "unable to add GPIO chip\n");
>> +               return ret;
>> +       }
>> +
>> +       /*
>> +        * Some of the GPIO interfaces do not have interrupt wired to the main
>> +        * processor
>> +        */
>> +       cygnus_gpio->irq = platform_get_irq(pdev, 0);
>> +       if (cygnus_gpio->irq < 0) {
>> +               ret = cygnus_gpio->irq;
>> +               if (ret == -EPROBE_DEFER)
>> +                       goto err_rm_gpiochip;
>> +
>> +               dev_info(&pdev->dev, "no interrupt hook\n");
>> +       }
> 
> From here:
> 
>> +       cygnus_gpio->irq_domain = irq_domain_add_linear(dev->of_node,
>> +                       gc->ngpio, &cygnus_irq_ops, cygnus_gpio);
>> +       if (!cygnus_gpio->irq_domain) {
>> +               dev_err(&pdev->dev, "unable to allocate IRQ domain\n");
>> +               ret = -ENXIO;
>> +               goto err_rm_gpiochip;
>> +       }
>> +
>> +       for (i = 0; i < gc->ngpio; i++) {
>> +               int irq = irq_create_mapping(cygnus_gpio->irq_domain, i);
>> +
>> +               irq_set_lockdep_class(irq, &gpio_lock_class);
>> +               irq_set_chip_data(irq, cygnus_gpio);
>> +               irq_set_chip_and_handler(irq, &cygnus_gpio_irq_chip,
>> +                               handle_simple_irq);
>> +               set_irq_flags(irq, IRQF_VALID);
>> +       }
>> +
>> +       irq_set_chained_handler(cygnus_gpio->irq, cygnus_gpio_irq_handler);
>> +       irq_set_handler_data(cygnus_gpio->irq, cygnus_gpio);
> 
> To here, replace with a single call to
> gpiochip_set_chained_irqchip(chip *, irq_chip *, irq, handler)...
This is excellent! Thanks!

> 
> Look at other drivers using GPIOLIB_IRQCHIP for inspiration.
> 
> Yours,
> Linus Walleij
> 

Re: [PATCH 1/5] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

On 1/12/2015 11:57 PM, Linus Walleij wrote:
> On Sat, Dec 6, 2014 at 1:40 AM, Ray Jui <rjui@broadcom.com> wrote:
> 
>> Document the GPIO device tree binding for Broadcom Cygnus SoC
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> (...)
>> +- #gpio-cells:
>> +    Must be two. The first cell is the GPIO pin number (within the
>> +controller's domain) and the second cell is used for the following:
>> +    bit[0]: polarity (0 for normal and 1 for inverted)
>> +    bit[18:16]: internal pull up/down: 0 - pull up/down disabled
>> +                                       1 - pull up enabled
>> +                                       2 - pull down enabled
>> +    bit[22:20]: drive strength: 0 - 2 mA
>> +                                1 - 4 mA
>> +                                2 - 6 mA
>> +                                3 - 8 mA
>> +                                4 - 10 mA
>> +                                5 - 12 mA
>> +                                6 - 14 mA
>> +                                7 - 16 mA
> 
> No. This pull up/down and drive strength is pin controller
> business, use a pin control backend behind the GPIO driver
> see Documentation/pinctrl.txt.
> 
> Initial states for these configurations can be set up using
> pin control hogs since pin control and GPIO is orthogonal.
> 
Yes, I got it! See my reply in the GPIO driver review. Thanks.

> Yours,
> Linus Walleij
> 

Re: [PATCH 1/5] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

On 1/12/2015 11:57 PM, Linus Walleij wrote:
> On Sat, Dec 6, 2014 at 1:40 AM, Ray Jui <rjui@broadcom.com> wrote:
> 
>> Document the GPIO device tree binding for Broadcom Cygnus SoC
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> (...)
>> +- #gpio-cells:
>> +    Must be two. The first cell is the GPIO pin number (within the
>> +controller's domain) and the second cell is used for the following:
>> +    bit[0]: polarity (0 for normal and 1 for inverted)
>> +    bit[18:16]: internal pull up/down: 0 - pull up/down disabled
>> +                                       1 - pull up enabled
>> +                                       2 - pull down enabled
>> +    bit[22:20]: drive strength: 0 - 2 mA
>> +                                1 - 4 mA
>> +                                2 - 6 mA
>> +                                3 - 8 mA
>> +                                4 - 10 mA
>> +                                5 - 12 mA
>> +                                6 - 14 mA
>> +                                7 - 16 mA
> 
> No. This pull up/down and drive strength is pin controller
> business, use a pin control backend behind the GPIO driver
> see Documentation/pinctrl.txt.
> 
> Initial states for these configurations can be set up using
> pin control hogs since pin control and GPIO is orthogonal.
> 
Yes, I got it! See my reply in the GPIO driver review. Thanks.

> Yours,
> Linus Walleij
> 

[PATCH 1/5] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Ray Jui]

On 1/12/2015 11:57 PM, Linus Walleij wrote:
> On Sat, Dec 6, 2014 at 1:40 AM, Ray Jui <rjui@broadcom.com> wrote:
> 
>> Document the GPIO device tree binding for Broadcom Cygnus SoC
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> (...)
>> +- #gpio-cells:
>> +    Must be two. The first cell is the GPIO pin number (within the
>> +controller's domain) and the second cell is used for the following:
>> +    bit[0]: polarity (0 for normal and 1 for inverted)
>> +    bit[18:16]: internal pull up/down: 0 - pull up/down disabled
>> +                                       1 - pull up enabled
>> +                                       2 - pull down enabled
>> +    bit[22:20]: drive strength: 0 - 2 mA
>> +                                1 - 4 mA
>> +                                2 - 6 mA
>> +                                3 - 8 mA
>> +                                4 - 10 mA
>> +                                5 - 12 mA
>> +                                6 - 14 mA
>> +                                7 - 16 mA
> 
> No. This pull up/down and drive strength is pin controller
> business, use a pin control backend behind the GPIO driver
> see Documentation/pinctrl.txt.
> 
> Initial states for these configurations can be set up using
> pin control hogs since pin control and GPIO is orthogonal.
> 
Yes, I got it! See my reply in the GPIO driver review. Thanks.

> Yours,
> Linus Walleij
> 

Re: [PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Ray Jui]

On 1/13/2015 12:20 AM, Linus Walleij wrote:
> On Fri, Jan 9, 2015 at 7:26 PM, Ray Jui <rjui@broadcom.com> wrote:
>> On 1/9/2015 2:12 AM, Linus Walleij wrote:
> 
>>> Just use "groups" and "function" and refer to
>>> Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
>>>
>>> Then "alt1", "alt2" etc are non-functional names of functions.
>>> Use the real function names, like "spi0" or so. This
>>> alt-business seems to be just a shortcut to make it
>>> simple, don't do that.
>>>
>>> Then you use e.g. "spi0" as a group name. I prefer you
>>> call that "spi0_grp" or something to say it is a group of
>>> pins associated with spi0, as spi0 is actually the
>>> function.
>>>
>> Hmmm, I did this by following brcm,bcm11351-pinctrl.txt:
>> - function: String. Specifies the pin mux selection. Values must be one
>> of: "alt1", "alt2", "alt3", "alt4"
>>
>> But you are right, in the pinctrl binding document it describes the
>> generic pin multiplexing nodes use "function" and "group".
> 
> Note "function" and "groups". Note groups is pluralis. You can
> select multiple groups for a single function.
> 
>> For example, the group "lcd" covers 30 pins. When I configure "lcd" to
>> alternate function 1, all 30 pins are muxed to LCD function. When
>> configured to function 2, all pins are muxed to SRAM function. Now, here
>> comes the issue, when configured to function 3, pins 1-15 and 20-30
>> become GPIO function, but pins 16-19 becomes SPI5 function. When it's
>> configured to function 4, all 30 pins become GPIO.
> 
> I would split the use case in two groups for LCD and SRAM,
> and three groups for GPIO:
> "lcd_grp", "sram_grp", "gpio-1-15_grp",
> "gpio-16-19_grp", "gpio-20-30_grp", "spi5_grp"
> 

> Valid combinations become
> 
> function = "lcd"
> groups = "lcd_grp";
> 
> function = "sram"
> groups = "sram_grp"
> 
> For all GPIO only this:
> 
> function = "gpio"
> groups = "gpio-1-16_grp", "gpio-16-19_grp", "gpio-20-30_grp"
> 
> For a combined GPIO+SPI:
> 
> function = "gpio"
> groups = "gpio-1-16_grp", "gpio-20-30_grp"
> 
> function = "spi5"
> groups = "spi5_grp"
> 
> The pinctrl runtile will protest if you try to combine spi5_grp
> with gpio-16-19_grp.
> 
Okay this makes sense. Thanks.

>> In some other cases, when I configure a group to other functions, there
>> could be spare pins which become unused (not brought out to the pad).
>> Or, the spare pins may also become a separate function.
> 
> That's cool.
> 
>> Based on the LCD example, I'd assume I would do the following for the
>> default LCD function:
>>
>> lcd_node {
>>         group = "lcd_grp";
>>         function = "lcd";
>> };
>>
>> And in the case of function 3, I would call the function "spi5" and
>> assume the rest of pins become either GPIO (or unused)?
>>
>> spi5_node {
>>         group = "lcd_grp";
>>         function = "spi5";
>> };
> 
> Looks cool per above.
> 
> You need some clever code in the driver to handle double-configuration
> of registers and so on, but I think it can be done.
Let me see what I can come up with.

> 
> Using pin control as a GPIO backend can be a bit tricky and will need
> some testing and elaboration, but the subsystem will block collisions.
> 
> Yours,
> Linus Walleij
> 

Re: [PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Ray Jui]

On 1/13/2015 12:20 AM, Linus Walleij wrote:
> On Fri, Jan 9, 2015 at 7:26 PM, Ray Jui <rjui@broadcom.com> wrote:
>> On 1/9/2015 2:12 AM, Linus Walleij wrote:
> 
>>> Just use "groups" and "function" and refer to
>>> Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
>>>
>>> Then "alt1", "alt2" etc are non-functional names of functions.
>>> Use the real function names, like "spi0" or so. This
>>> alt-business seems to be just a shortcut to make it
>>> simple, don't do that.
>>>
>>> Then you use e.g. "spi0" as a group name. I prefer you
>>> call that "spi0_grp" or something to say it is a group of
>>> pins associated with spi0, as spi0 is actually the
>>> function.
>>>
>> Hmmm, I did this by following brcm,bcm11351-pinctrl.txt:
>> - function: String. Specifies the pin mux selection. Values must be one
>> of: "alt1", "alt2", "alt3", "alt4"
>>
>> But you are right, in the pinctrl binding document it describes the
>> generic pin multiplexing nodes use "function" and "group".
> 
> Note "function" and "groups". Note groups is pluralis. You can
> select multiple groups for a single function.
> 
>> For example, the group "lcd" covers 30 pins. When I configure "lcd" to
>> alternate function 1, all 30 pins are muxed to LCD function. When
>> configured to function 2, all pins are muxed to SRAM function. Now, here
>> comes the issue, when configured to function 3, pins 1-15 and 20-30
>> become GPIO function, but pins 16-19 becomes SPI5 function. When it's
>> configured to function 4, all 30 pins become GPIO.
> 
> I would split the use case in two groups for LCD and SRAM,
> and three groups for GPIO:
> "lcd_grp", "sram_grp", "gpio-1-15_grp",
> "gpio-16-19_grp", "gpio-20-30_grp", "spi5_grp"
> 

> Valid combinations become
> 
> function = "lcd"
> groups = "lcd_grp";
> 
> function = "sram"
> groups = "sram_grp"
> 
> For all GPIO only this:
> 
> function = "gpio"
> groups = "gpio-1-16_grp", "gpio-16-19_grp", "gpio-20-30_grp"
> 
> For a combined GPIO+SPI:
> 
> function = "gpio"
> groups = "gpio-1-16_grp", "gpio-20-30_grp"
> 
> function = "spi5"
> groups = "spi5_grp"
> 
> The pinctrl runtile will protest if you try to combine spi5_grp
> with gpio-16-19_grp.
> 
Okay this makes sense. Thanks.

>> In some other cases, when I configure a group to other functions, there
>> could be spare pins which become unused (not brought out to the pad).
>> Or, the spare pins may also become a separate function.
> 
> That's cool.
> 
>> Based on the LCD example, I'd assume I would do the following for the
>> default LCD function:
>>
>> lcd_node {
>>         group = "lcd_grp";
>>         function = "lcd";
>> };
>>
>> And in the case of function 3, I would call the function "spi5" and
>> assume the rest of pins become either GPIO (or unused)?
>>
>> spi5_node {
>>         group = "lcd_grp";
>>         function = "spi5";
>> };
> 
> Looks cool per above.
> 
> You need some clever code in the driver to handle double-configuration
> of registers and so on, but I think it can be done.
Let me see what I can come up with.

> 
> Using pin control as a GPIO backend can be a bit tricky and will need
> some testing and elaboration, but the subsystem will block collisions.
> 
> Yours,
> Linus Walleij
> 

[PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Ray Jui]

On 1/13/2015 12:20 AM, Linus Walleij wrote:
> On Fri, Jan 9, 2015 at 7:26 PM, Ray Jui <rjui@broadcom.com> wrote:
>> On 1/9/2015 2:12 AM, Linus Walleij wrote:
> 
>>> Just use "groups" and "function" and refer to
>>> Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
>>>
>>> Then "alt1", "alt2" etc are non-functional names of functions.
>>> Use the real function names, like "spi0" or so. This
>>> alt-business seems to be just a shortcut to make it
>>> simple, don't do that.
>>>
>>> Then you use e.g. "spi0" as a group name. I prefer you
>>> call that "spi0_grp" or something to say it is a group of
>>> pins associated with spi0, as spi0 is actually the
>>> function.
>>>
>> Hmmm, I did this by following brcm,bcm11351-pinctrl.txt:
>> - function: String. Specifies the pin mux selection. Values must be one
>> of: "alt1", "alt2", "alt3", "alt4"
>>
>> But you are right, in the pinctrl binding document it describes the
>> generic pin multiplexing nodes use "function" and "group".
> 
> Note "function" and "groups". Note groups is pluralis. You can
> select multiple groups for a single function.
> 
>> For example, the group "lcd" covers 30 pins. When I configure "lcd" to
>> alternate function 1, all 30 pins are muxed to LCD function. When
>> configured to function 2, all pins are muxed to SRAM function. Now, here
>> comes the issue, when configured to function 3, pins 1-15 and 20-30
>> become GPIO function, but pins 16-19 becomes SPI5 function. When it's
>> configured to function 4, all 30 pins become GPIO.
> 
> I would split the use case in two groups for LCD and SRAM,
> and three groups for GPIO:
> "lcd_grp", "sram_grp", "gpio-1-15_grp",
> "gpio-16-19_grp", "gpio-20-30_grp", "spi5_grp"
> 

> Valid combinations become
> 
> function = "lcd"
> groups = "lcd_grp";
> 
> function = "sram"
> groups = "sram_grp"
> 
> For all GPIO only this:
> 
> function = "gpio"
> groups = "gpio-1-16_grp", "gpio-16-19_grp", "gpio-20-30_grp"
> 
> For a combined GPIO+SPI:
> 
> function = "gpio"
> groups = "gpio-1-16_grp", "gpio-20-30_grp"
> 
> function = "spi5"
> groups = "spi5_grp"
> 
> The pinctrl runtile will protest if you try to combine spi5_grp
> with gpio-16-19_grp.
> 
Okay this makes sense. Thanks.

>> In some other cases, when I configure a group to other functions, there
>> could be spare pins which become unused (not brought out to the pad).
>> Or, the spare pins may also become a separate function.
> 
> That's cool.
> 
>> Based on the LCD example, I'd assume I would do the following for the
>> default LCD function:
>>
>> lcd_node {
>>         group = "lcd_grp";
>>         function = "lcd";
>> };
>>
>> And in the case of function 3, I would call the function "spi5" and
>> assume the rest of pins become either GPIO (or unused)?
>>
>> spi5_node {
>>         group = "lcd_grp";
>>         function = "spi5";
>> };
> 
> Looks cool per above.
> 
> You need some clever code in the driver to handle double-configuration
> of registers and so on, but I think it can be done.
Let me see what I can come up with.

> 
> Using pin control as a GPIO backend can be a bit tricky and will need
> some testing and elaboration, but the subsystem will block collisions.
> 
> Yours,
> Linus Walleij
> 

Re: [PATCH 2/4] pinctrl: cygnus: add initial pinctrl support

[Ray Jui]

On 1/13/2015 12:25 AM, Linus Walleij wrote:
> On Fri, Jan 9, 2015 at 7:38 PM, Ray Jui <rjui@broadcom.com> wrote:
>> On 1/9/2015 3:03 AM, Linus Walleij wrote:
>>> On Fri, Nov 28, 2014 at 12:46 AM, Ray Jui <rjui@broadcom.com> wrote:
> 
>>> I don't know if the hardware has any similarity though, so invite
>>> the authors of the previous drivers to review this code.
>>>
>> They are completely different. The only similarity between Cygnus and
>> bcm281xx pinctrl is that they use the same concept of alternation
>> functions (1, 2, 3, 4) for mux configuration.
> 
> Then you can probably look at that driver for inspiration on how to handle
> the situation you described earlier with collissions.
> 
>>>> +/*
>>>> + * List of groups of pins
>>>> + */
>>>> +static const unsigned gpio0_pins[] = { 12 };
>>>> +static const unsigned gpio1_pins[] = { 13 };
>>>> +static const unsigned gpio2_pins[] = { 14 };
>>>> +static const unsigned gpio3_pins[] = { 15 };
>>>> +static const unsigned gpio4_pins[] = { 16 };
>>>> +static const unsigned gpio5_pins[] = { 17 };
>>>> +static const unsigned gpio6_pins[] = { 18 };
>>>> +static const unsigned gpio7_pins[] = { 19 };
>>>> +static const unsigned gpio8_pins[] = { 20 };
>>>> +static const unsigned gpio9_pins[] = { 21 };
>>>> +static const unsigned gpio10_pins[] = { 22 };
>>>> +static const unsigned gpio11_pins[] = { 23 };
>>>> +static const unsigned gpio12_pins[] = { 24 };
>>>> +static const unsigned gpio13_pins[] = { 25 };
>>>> +static const unsigned gpio14_pins[] = { 26 };
>>>> +static const unsigned gpio15_pins[] = { 27 };
>>>> +static const unsigned gpio16_pins[] = { 28 };
>>>> +static const unsigned gpio17_pins[] = { 29 };
>>>> +static const unsigned gpio18_pins[] = { 30 };
>>>> +static const unsigned gpio19_pins[] = { 31 };
>>>> +static const unsigned gpio20_pins[] = { 32 };
>>>> +static const unsigned gpio21_pins[] = { 33 };
>>>> +static const unsigned gpio22_pins[] = { 34 };
>>>> +static const unsigned gpio23_pins[] = { 35 };
>>>
>>> Have you considered implementing .gpio_request_enable()
>>> and .gpio_disable_free() to get around having to have one
>>> group for each GPIO line?
>>>
>> Okay the Cygnus pin controller is really a mess. GPIO 0 ~ GPIO23 are
>> really 23 distinct groups, each with one pin. Then the rest of GPIOs go
>> under other groups. In general, when we set a group to alternate
>> function 4, all pins become GPIO.
> 
> It will require some complicated code no matter how you
> handle it I'm afraid. Rely on the pin control subsystem
> to handle collisions though.
> 
>>>> +static const unsigned qspi_gpio_pins[] = { 108, 109 };
>>>> +static const unsigned smart_card0_fcb_pins[] = { 45 };
>>>> +static const unsigned smart_card1_fcb_pins[] = { 51 };
>>>> +static const unsigned gpio0_3p3_pins[] = { 176 };
>>>> +static const unsigned gpio1_3p3_pins[] = { 177 };
>>>> +static const unsigned gpio2_3p3_pins[] = { 178 };
>>>
>>> Looks good...
>>>
>> Note these pins are definitions in the driver that help to describe the
>> pad layout. We can't really configure any individual pins in Cygnus.
> 
> Yeah it's a groupwise controller then, that's similar to
> e.g. the coh901 driver.
> 
> We should be able to accomodate this...
> 
Okay will check the coh901 driver.

>>>> +static int cygnus_dt_node_to_map(struct pinctrl_dev *pctrl_dev,
>>>> +               struct device_node *np, struct pinctrl_map **map,
>>>> +               unsigned *num_maps)
>>>> +{
>>>
>>> After Sören Brinkmanns patches youy should be able to use core
>>> functions for this and avoid this code altogether.
>>
>> Will that help to take care our case, based on the way we will use
>> "function" and "group"?
> 
> groupS but yes it will work with your controller, though I think
> .set_mux and the controller state will need some elaborate code
> to handle what the framework requests.
> 
Thanks.

>>>> +       num_groups = of_property_count_strings(np, "brcm,groups");
>>>
>>> As mentioned, just "groups".
>>>
>> I guess I will use "group"?
> 
> No groups, as with the standard attribute "gpios", this may be
> a single group too, it's just a standard binding.
> 
Okay.

> Yours,
> Linus Walleij
> 

[PATCH 2/4] pinctrl: cygnus: add initial pinctrl support

[Ray Jui]

On 1/13/2015 12:25 AM, Linus Walleij wrote:
> On Fri, Jan 9, 2015 at 7:38 PM, Ray Jui <rjui@broadcom.com> wrote:
>> On 1/9/2015 3:03 AM, Linus Walleij wrote:
>>> On Fri, Nov 28, 2014 at 12:46 AM, Ray Jui <rjui@broadcom.com> wrote:
> 
>>> I don't know if the hardware has any similarity though, so invite
>>> the authors of the previous drivers to review this code.
>>>
>> They are completely different. The only similarity between Cygnus and
>> bcm281xx pinctrl is that they use the same concept of alternation
>> functions (1, 2, 3, 4) for mux configuration.
> 
> Then you can probably look at that driver for inspiration on how to handle
> the situation you described earlier with collissions.
> 
>>>> +/*
>>>> + * List of groups of pins
>>>> + */
>>>> +static const unsigned gpio0_pins[] = { 12 };
>>>> +static const unsigned gpio1_pins[] = { 13 };
>>>> +static const unsigned gpio2_pins[] = { 14 };
>>>> +static const unsigned gpio3_pins[] = { 15 };
>>>> +static const unsigned gpio4_pins[] = { 16 };
>>>> +static const unsigned gpio5_pins[] = { 17 };
>>>> +static const unsigned gpio6_pins[] = { 18 };
>>>> +static const unsigned gpio7_pins[] = { 19 };
>>>> +static const unsigned gpio8_pins[] = { 20 };
>>>> +static const unsigned gpio9_pins[] = { 21 };
>>>> +static const unsigned gpio10_pins[] = { 22 };
>>>> +static const unsigned gpio11_pins[] = { 23 };
>>>> +static const unsigned gpio12_pins[] = { 24 };
>>>> +static const unsigned gpio13_pins[] = { 25 };
>>>> +static const unsigned gpio14_pins[] = { 26 };
>>>> +static const unsigned gpio15_pins[] = { 27 };
>>>> +static const unsigned gpio16_pins[] = { 28 };
>>>> +static const unsigned gpio17_pins[] = { 29 };
>>>> +static const unsigned gpio18_pins[] = { 30 };
>>>> +static const unsigned gpio19_pins[] = { 31 };
>>>> +static const unsigned gpio20_pins[] = { 32 };
>>>> +static const unsigned gpio21_pins[] = { 33 };
>>>> +static const unsigned gpio22_pins[] = { 34 };
>>>> +static const unsigned gpio23_pins[] = { 35 };
>>>
>>> Have you considered implementing .gpio_request_enable()
>>> and .gpio_disable_free() to get around having to have one
>>> group for each GPIO line?
>>>
>> Okay the Cygnus pin controller is really a mess. GPIO 0 ~ GPIO23 are
>> really 23 distinct groups, each with one pin. Then the rest of GPIOs go
>> under other groups. In general, when we set a group to alternate
>> function 4, all pins become GPIO.
> 
> It will require some complicated code no matter how you
> handle it I'm afraid. Rely on the pin control subsystem
> to handle collisions though.
> 
>>>> +static const unsigned qspi_gpio_pins[] = { 108, 109 };
>>>> +static const unsigned smart_card0_fcb_pins[] = { 45 };
>>>> +static const unsigned smart_card1_fcb_pins[] = { 51 };
>>>> +static const unsigned gpio0_3p3_pins[] = { 176 };
>>>> +static const unsigned gpio1_3p3_pins[] = { 177 };
>>>> +static const unsigned gpio2_3p3_pins[] = { 178 };
>>>
>>> Looks good...
>>>
>> Note these pins are definitions in the driver that help to describe the
>> pad layout. We can't really configure any individual pins in Cygnus.
> 
> Yeah it's a groupwise controller then, that's similar to
> e.g. the coh901 driver.
> 
> We should be able to accomodate this...
> 
Okay will check the coh901 driver.

>>>> +static int cygnus_dt_node_to_map(struct pinctrl_dev *pctrl_dev,
>>>> +               struct device_node *np, struct pinctrl_map **map,
>>>> +               unsigned *num_maps)
>>>> +{
>>>
>>> After S?ren Brinkmanns patches youy should be able to use core
>>> functions for this and avoid this code altogether.
>>
>> Will that help to take care our case, based on the way we will use
>> "function" and "group"?
> 
> groupS but yes it will work with your controller, though I think
> .set_mux and the controller state will need some elaborate code
> to handle what the framework requests.
> 
Thanks.

>>>> +       num_groups = of_property_count_strings(np, "brcm,groups");
>>>
>>> As mentioned, just "groups".
>>>
>> I guess I will use "group"?
> 
> No groups, as with the standard attribute "gpios", this may be
> a single group too, it's just a standard binding.
> 
Okay.

> Yours,
> Linus Walleij
> 

Re: [PATCH v3 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Uwe Kleine-König]

Hello,

On Tue, Dec 09, 2014 at 07:57:11PM -0800, Ray Jui wrote:
> Add initial support to the Broadcom iProc I2C controller found in the
> iProc family of SoCs.
> 
> The iProc I2C controller has separate internal TX and RX FIFOs, each has
> a size of 64 bytes. The iProc I2C controller supports two bus speeds
> including standard mode (100kHz) and fast mode (400kHz)
> 
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> ---
>  drivers/i2c/busses/Kconfig         |   10 +
>  drivers/i2c/busses/Makefile        |    1 +
>  drivers/i2c/busses/i2c-bcm-iproc.c |  500 ++++++++++++++++++++++++++++++++++++
>  3 files changed, 511 insertions(+)
>  create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c
> 
> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
> index c1351d9..df21366 100644
> --- a/drivers/i2c/busses/Kconfig
> +++ b/drivers/i2c/busses/Kconfig
> @@ -372,6 +372,16 @@ config I2C_BCM2835
>  	  This support is also available as a module.  If so, the module
>  	  will be called i2c-bcm2835.
>  
> +config I2C_BCM_IPROC
> +	tristate "Broadcom iProc I2C controller"
> +	depends on ARCH_BCM_IPROC
> +	default y
It would be nice to have the following here to improve compile coverage
testing:

	depends on ARCH_BCM_IPROC || COMPILE_TEST
	default ARCH_BCM_IPROC

> +	help
> +	  If you say yes to this option, support will be included for the
> +	  Broadcom iProc I2C controller.
> +
> +	  If you don't know what to do here, say N.
> +
>  config I2C_BCM_KONA
>  	tristate "BCM Kona I2C adapter"
>  	depends on ARCH_BCM_MOBILE
> diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
> index 5e6c822..216e7be 100644
> --- a/drivers/i2c/busses/Makefile
> +++ b/drivers/i2c/busses/Makefile
> @@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
>  obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
>  obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
>  obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
> +obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
>  obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
>  obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
>  obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
> diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
> new file mode 100644
> index 0000000..35ac497
> --- /dev/null
> +++ b/drivers/i2c/busses/i2c-bcm-iproc.c
> @@ -0,0 +1,500 @@
> +/*
> + * Copyright (C) 2014 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/device.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/sched.h>
> +#include <linux/i2c.h>
> +#include <linux/interrupt.h>
> +#include <linux/platform_device.h>
> +#include <linux/clk.h>
> +#include <linux/io.h>
> +#include <linux/slab.h>
> +#include <linux/delay.h>
> +
> +#define CFG_OFFSET                   0x00
> +#define CFG_RESET_SHIFT              31
> +#define CFG_EN_SHIFT                 30
> +#define CFG_M_RETRY_CNT_SHIFT        16
> +#define CFG_M_RETRY_CNT_MASK         0x0f
> +
> +#define TIM_CFG_OFFSET               0x04
> +#define TIME_CFG_MODE_400_SHIFT      31
> +
> +#define M_FIFO_CTRL_OFFSET           0x0c
> +#define M_FIFO_RX_FLUSH_SHIFT        31
> +#define M_FIFO_TX_FLUSH_SHIFT        30
> +#define M_FIFO_RX_CNT_SHIFT          16
> +#define M_FIFO_RX_CNT_MASK           0x7f
> +#define M_FIFO_RX_THLD_SHIFT         8
> +#define M_FIFO_RX_THLD_MASK          0x3f
> +
> +#define M_CMD_OFFSET                 0x30
> +#define M_CMD_START_BUSY_SHIFT       31
> +#define M_CMD_STATUS_SHIFT           25
> +#define M_CMD_STATUS_MASK            0x07
> +#define M_CMD_STATUS_SUCCESS         0x0
> +#define M_CMD_STATUS_LOST_ARB        0x1
> +#define M_CMD_STATUS_NACK_ADDR       0x2
> +#define M_CMD_STATUS_NACK_DATA       0x3
> +#define M_CMD_STATUS_TIMEOUT         0x4
> +#define M_CMD_PROTOCOL_SHIFT         9
> +#define M_CMD_PROTOCOL_MASK          0xf
> +#define M_CMD_PROTOCOL_BLK_WR        0x7
> +#define M_CMD_PROTOCOL_BLK_RD        0x8
> +#define M_CMD_PEC_SHIFT              8
> +#define M_CMD_RD_CNT_SHIFT           0
> +#define M_CMD_RD_CNT_MASK            0xff
> +
> +#define IE_OFFSET                    0x38
> +#define IE_M_RX_FIFO_FULL_SHIFT      31
> +#define IE_M_RX_THLD_SHIFT           30
> +#define IE_M_START_BUSY_SHIFT        28
> +
> +#define IS_OFFSET                    0x3c
> +#define IS_M_RX_FIFO_FULL_SHIFT      31
> +#define IS_M_RX_THLD_SHIFT           30
> +#define IS_M_START_BUSY_SHIFT        28
> +
> +#define M_TX_OFFSET                  0x40
> +#define M_TX_WR_STATUS_SHIFT         31
> +#define M_TX_DATA_SHIFT              0
> +#define M_TX_DATA_MASK               0xff
> +
> +#define M_RX_OFFSET                  0x44
> +#define M_RX_STATUS_SHIFT            30
> +#define M_RX_STATUS_MASK             0x03
> +#define M_RX_PEC_ERR_SHIFT           29
> +#define M_RX_DATA_SHIFT              0
> +#define M_RX_DATA_MASK               0xff
> +
> +#define I2C_TIMEOUT_MESC             100
> +#define M_TX_RX_FIFO_SIZE            64
> +
> +enum bus_speed_index {
> +	I2C_SPD_100K = 0,
> +	I2C_SPD_400K,
> +};
> +
> +struct bcm_iproc_i2c_dev {
> +	struct device *device;
> +
> +	void __iomem *base;
> +	struct i2c_msg *msg;
> +
> +	struct i2c_adapter adapter;
> +
> +	struct completion done;
> +};
> +
> +/*
> + * Can be expanded in the future if more interrupt status bits are utilized
> + */
> +#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
> +
> +static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
> +{
> +	struct bcm_iproc_i2c_dev *dev = data;
> +	u32 status = readl(dev->base + IS_OFFSET);
> +
> +	status &= ISR_MASK;
> +
> +	if (!status)
> +		return IRQ_NONE;
> +
> +	writel(status, dev->base + IS_OFFSET);
> +	complete_all(&dev->done);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static int __wait_for_bus_idle(struct bcm_iproc_i2c_dev *dev)
> +{
> +	unsigned long timeout = jiffies + msecs_to_jiffies(I2C_TIMEOUT_MESC);
> +
> +	while (readl(dev->base + M_CMD_OFFSET) &
> +			(1 << M_CMD_START_BUSY_SHIFT)) {
> +		if (time_after(jiffies, timeout)) {
> +			dev_err(dev->device, "wait for bus idle timeout\n");
> +			return -ETIMEDOUT;
> +		}
Add a call to cpu_relax here. Do you really need a tight loop here?

> +	}
> +
> +	return 0;
> +}
> +
> +static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *dev,
> +				     struct i2c_msg *msg, u8 *addr)
> +{
> +
> +	if (msg->flags & I2C_M_TEN) {
> +		dev_err(dev->device, "no support for 10-bit address\n");
> +		return -EINVAL;
> +	}
> +
> +	*addr = (msg->addr << 1) & 0xfe;
I don't see what difference the & 0xfe makes. I think you can drop that.

> +
> +	if (msg->flags & I2C_M_RD)
> +		*addr |= 1;
> +
> +	return 0;
> +}
> +
> +static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *dev)
> +{
> +	u32 val;
> +
> +	val = readl(dev->base + M_CMD_OFFSET);
> +	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
> +
> +	switch (val) {
> +	case M_CMD_STATUS_SUCCESS:
> +		return 0;
> +
> +	case M_CMD_STATUS_LOST_ARB:
> +		dev_err(dev->device, "lost bus arbitration\n");
I wouldn't dev_err that, only dev_dbg. I'm not sure how usual the errors
for the next two cases is, maybe degrade them to dev_dbg, too?

> +		return -EREMOTEIO;
> +
> +	case M_CMD_STATUS_NACK_ADDR:
> +		dev_err(dev->device, "NAK addr:0x%02x\n", dev->msg->addr);
> +		return -EREMOTEIO;
> +
> +	case M_CMD_STATUS_NACK_DATA:
> +		dev_err(dev->device, "NAK data\n");
> +		return -EREMOTEIO;
> +
> +	case M_CMD_STATUS_TIMEOUT:
> +		dev_err(dev->device, "bus timeout\n");
> +		return -ETIMEDOUT;
> +
> +	default:
> +		dev_err(dev->device, "unknown error code=%d\n", val);
> +		return -EREMOTEIO;
> +	}
> +
> +	return -EREMOTEIO;
> +}
> +
> +static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *dev,
> +					 struct i2c_msg *msg)
> +{
> +	int ret, i;
> +	u8 addr;
> +	u32 val;
> +	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
> +
> +	if (msg->len < 1 || msg->len > M_TX_RX_FIFO_SIZE - 1) {
> +		dev_err(dev->device,
> +			"supported data length is 1 - %u bytes\n",
> +				M_TX_RX_FIFO_SIZE - 1);
> +		return -EINVAL;
> +	}
> +
> +	dev->msg = msg;
> +	ret = __wait_for_bus_idle(dev);
> +	if (ret)
> +		return ret;
> +
> +	ret = bcm_iproc_i2c_format_addr(dev, msg, &addr);
> +	if (ret)
> +		return ret;
> +
> +	/* load slave address into the TX FIFO */
> +	writel(addr, dev->base + M_TX_OFFSET);
> +
> +	/* for a write transaction, load data into the TX FIFO */
> +	if (!(msg->flags & I2C_M_RD)) {
> +		for (i = 0; i < msg->len; i++) {
> +			val = msg->buf[i];
> +
> +			/* mark the last byte */
> +			if (i == msg->len - 1)
> +				val |= 1 << M_TX_WR_STATUS_SHIFT;
> +
> +			writel(val, dev->base + M_TX_OFFSET);
> +		}
> +	}
> +
> +	/* mark as incomplete before starting the transaction */
> +	reinit_completion(&dev->done);
> +
> +	/*
> +	 * Enable the "start busy" interrupt, which will be triggered after
> +	 * the transaction is done
This sound's wrong. I'd expect "start busy" to trigger as soon as the
controller gets hold of the bus.

> +	 */
> +	writel(1 << IE_M_START_BUSY_SHIFT, dev->base + IE_OFFSET);
> +
> +	/*
> +	 * Now we can activate the transfer. For a read operation, specify the
> +	 * number of bytes to read
> +	 */
> +	val = 1 << M_CMD_START_BUSY_SHIFT;
> +	if (msg->flags & I2C_M_RD) {
> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
> +			(msg->len << M_CMD_RD_CNT_SHIFT);
> +	} else {
> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
> +	}
> +	writel(val, dev->base + M_CMD_OFFSET);
> +
> +	time_left = wait_for_completion_timeout(&dev->done, time_left);
> +
> +	/* disable all interrupts */
> +	writel(0, dev->base + IE_OFFSET);
> +
> +	if (!time_left) {
> +		dev_err(dev->device, "transaction times out\n");
> +
> +		/* flush FIFOs */
> +		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
> +			(1 << M_FIFO_TX_FLUSH_SHIFT);
> +		writel(val, dev->base + M_FIFO_CTRL_OFFSET);
> +		return -EREMOTEIO;
> +	}
> +
> +	ret = bcm_iproc_i2c_check_status(dev);
> +	if (ret) {
> +		/* flush both TX/RX FIFOs */
> +		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
> +			(1 << M_FIFO_TX_FLUSH_SHIFT);
> +		writel(val, dev->base + M_FIFO_CTRL_OFFSET);
> +		return ret;
> +	}
> +
> +	/*
> +	 * For a read operation, we now need to load the data from FIFO
> +	 * into the memory buffer
> +	 */
> +	if (msg->flags & I2C_M_RD) {
> +		for (i = 0; i < msg->len; i++) {
> +			msg->buf[i] = (readl(dev->base + M_RX_OFFSET) >>
> +					M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
> +		}
> +	}
> +
> +	dev_dbg(dev->device, "xfer %c, addr=0x%02x, len=%d\n",
> +			(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
> +			msg->len);
> +	dev_dbg(dev->device, "**** data start ****\n");
> +	for (i = 0; i < msg->len; i++)
> +		dev_dbg(dev->device, "0x%02x ",  msg->buf[i]);
> +	dev_dbg(dev->device, "**** data end ****\n");
> +
> +	return 0;
> +}
> +
> +static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
> +			      struct i2c_msg msgs[], int num)
> +{
> +	struct bcm_iproc_i2c_dev *dev = i2c_get_adapdata(adapter);
> +	int ret, i;
> +
> +	/* go through all messages */
> +	for (i = 0; i < num; i++) {
> +		ret = bcm_iproc_i2c_xfer_single_msg(dev, &msgs[i]);
> +		if (ret) {
> +			dev_err(dev->device, "xfer failed\n");
> +			return ret;
> +		}
> +	}
> +
> +	return num;
> +}
> +
> +static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
> +{
> +	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
> +}
> +
> +static const struct i2c_algorithm bcm_iproc_algo = {
> +	.master_xfer = bcm_iproc_i2c_xfer,
> +	.functionality = bcm_iproc_i2c_functionality,
> +};
> +
> +static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *dev)
> +{
> +	unsigned int bus_speed, speed_bit;
> +	u32 val;
> +	int ret = of_property_read_u32(dev->device->of_node, "clock-frequency",
> +				       &bus_speed);
Inconsistent coding style. At most other places you use 2 tabs to indent
a continued line. (Well you use this style for breaks in function
declarations. Using the same style for both cases would be nice.)

> +	if (ret < 0) {
> +		dev_err(dev->device, "missing clock-frequency property\n");
> +		return -ENODEV;
> +	}
> +
> +	switch (bus_speed) {
> +	case 100000:
> +		speed_bit = 0;
> +		break;
> +	case 400000:
> +		speed_bit = 1;
> +		break;
> +	default:
> +		dev_err(dev->device, "%d Hz bus speed not supported\n",
> +				bus_speed);
> +		dev_err(dev->device, "valid speeds are 100khz and 400khz\n");
> +		return -EINVAL;
> +	}
I'd be more graceful here:

	if (bus_speed < 100000)
		error_out;
	else if (bus_speed < 400000)
		speed_bit = 0;
	else
		/* >= 400000 */
		speed_bit = 1;

> +
> +	val = readl(dev->base + TIM_CFG_OFFSET);
> +	val &= ~(1 << TIME_CFG_MODE_400_SHIFT);
> +	val |= speed_bit << TIME_CFG_MODE_400_SHIFT;
> +	writel(val, dev->base + TIM_CFG_OFFSET);
> +
> +	dev_info(dev->device, "bus set to %u Hz\n", bus_speed);
> +
> +	return 0;
> +}
> +
> +static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *dev)
> +{
> +	u32 val;
> +
> +	/* put controller in reset */
> +	val = readl(dev->base + CFG_OFFSET);
> +	val |= 1 << CFG_RESET_SHIFT;
> +	val &= ~(1 << CFG_EN_SHIFT);
> +	writel(val, dev->base + CFG_OFFSET);
> +
> +	/* wait 100 usec per spec */
> +	udelay(100);
> +
> +	/* bring controller out of reset */
> +	val = readl(dev->base + CFG_OFFSET);
Is it necessary to reread the register value here?

> +	val &= ~(1 << CFG_RESET_SHIFT);
> +	writel(val, dev->base + CFG_OFFSET);
> +
> +	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
> +	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
> +	writel(val, dev->base + M_FIFO_CTRL_OFFSET);
> +
> +	/* disable all interrupts */
> +	val = 0;
> +	writel(val, dev->base + IE_OFFSET);
writel(0, dev->base + IE_OFFSET);

> +	/* clear all pending interrupts */
> +	val = readl(dev->base + IS_OFFSET);
> +	writel(val, dev->base + IS_OFFSET);
writel(0xffffffff, dev->base + IS_OFFSET); ??

> +
> +	return 0;
> +}
> +
> +static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *dev)
> +{
> +	u32 val;
> +
> +	val = readl(dev->base + CFG_OFFSET);
> +	val |= 1 << CFG_EN_SHIFT;
> +	writel(val, dev->base + CFG_OFFSET);
> +}
> +
> +static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *dev)
> +{
> +	u32 val;
> +
> +	val = readl(dev->base + CFG_OFFSET);
> +	val &= ~(1 << CFG_EN_SHIFT);
> +	writel(val, dev->base + CFG_OFFSET);
> +}
> +
> +static int bcm_iproc_i2c_probe(struct platform_device *pdev)
> +{
> +	int irq, ret = 0;
> +	struct bcm_iproc_i2c_dev *dev;
"dev" is a misleading name here. I'd call this

	bcm_iproc_i2c_ddata *ddata;

> +	struct i2c_adapter *adap;
> +	struct resource *res;
> +
> +	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
> +	if (!dev)
> +		return -ENOMEM;
> +
> +	platform_set_drvdata(pdev, dev);
> +	dev->device = &pdev->dev;
> +	init_completion(&dev->done);
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	dev->base = devm_ioremap_resource(dev->device, res);
> +	if (IS_ERR(dev->base))
> +		return -ENOMEM;
		return PTR_ERR(dev->base);

> +
> +	ret = bcm_iproc_i2c_init(dev);
> +	if (ret)
> +		return ret;
> +
> +	ret = bcm_iproc_i2c_cfg_speed(dev);
> +	if (ret)
> +		return ret;
> +
> +	irq = platform_get_irq(pdev, 0);
> +	if (irq < 0) {
irq == 0 should be handled as error, too.

> +		dev_err(dev->device, "no irq resource\n");
> +		return irq;
> +	}
> +
> +	ret = devm_request_irq(&pdev->dev, irq, bcm_iproc_i2c_isr,
> +			IRQF_SHARED, pdev->name, dev);
> +	if (ret) {
> +		dev_err(dev->device, "unable to request irq %i\n", irq);
> +		return ret;
> +	}
> +
> +	bcm_iproc_i2c_enable(dev);
> +
> +	adap = &dev->adapter;
> +	i2c_set_adapdata(adap, dev);
> +	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
> +	adap->algo = &bcm_iproc_algo;
> +	adap->dev.parent = &pdev->dev;
> +	adap->dev.of_node = pdev->dev.of_node;
> +
> +	ret = i2c_add_adapter(adap);
> +	if (ret) {
> +		dev_err(dev->device, "failed to add adapter\n");
> +		return ret;
> +	}
> +
> +	dev_info(dev->device, "device registered successfully\n");
This just clutters the boot log. Please remove.

> +
> +	return 0;
> +}
> +
> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
> +{
> +	struct bcm_iproc_i2c_dev *dev = platform_get_drvdata(pdev);
> +
> +	i2c_del_adapter(&dev->adapter);
> +	bcm_iproc_i2c_disable(dev);
I think you have a problem here if bcm_iproc_i2c_remove is called while
an irq is still being serviced. I'm not sure how to prevent this
properly for a shared interrupt.

> +
> +	return 0;
> +}
> +
> +static const struct of_device_id bcm_iproc_i2c_of_match[] = {
> +	{.compatible = "brcm,iproc-i2c",},
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
> +
> +static struct platform_driver bcm_iproc_i2c_driver = {
> +	.driver = {
> +		   .name = "bcm-iproc-i2c",
> +		   .of_match_table = bcm_iproc_i2c_of_match,
> +		   },
Inconsistent indention.

> +	.probe = bcm_iproc_i2c_probe,
> +	.remove = bcm_iproc_i2c_remove,
> +};
> +module_platform_driver(bcm_iproc_i2c_driver);
> +
> +MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
> +MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
> +MODULE_LICENSE("GPL v2");

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

Re: [PATCH v3 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Uwe Kleine-König]

Hello,

On Tue, Dec 09, 2014 at 07:57:11PM -0800, Ray Jui wrote:
> Add initial support to the Broadcom iProc I2C controller found in the
> iProc family of SoCs.
> 
> The iProc I2C controller has separate internal TX and RX FIFOs, each has
> a size of 64 bytes. The iProc I2C controller supports two bus speeds
> including standard mode (100kHz) and fast mode (400kHz)
> 
> Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
> Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
> ---
>  drivers/i2c/busses/Kconfig         |   10 +
>  drivers/i2c/busses/Makefile        |    1 +
>  drivers/i2c/busses/i2c-bcm-iproc.c |  500 ++++++++++++++++++++++++++++++++++++
>  3 files changed, 511 insertions(+)
>  create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c
> 
> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
> index c1351d9..df21366 100644
> --- a/drivers/i2c/busses/Kconfig
> +++ b/drivers/i2c/busses/Kconfig
> @@ -372,6 +372,16 @@ config I2C_BCM2835
>  	  This support is also available as a module.  If so, the module
>  	  will be called i2c-bcm2835.
>  
> +config I2C_BCM_IPROC
> +	tristate "Broadcom iProc I2C controller"
> +	depends on ARCH_BCM_IPROC
> +	default y
It would be nice to have the following here to improve compile coverage
testing:

	depends on ARCH_BCM_IPROC || COMPILE_TEST
	default ARCH_BCM_IPROC

> +	help
> +	  If you say yes to this option, support will be included for the
> +	  Broadcom iProc I2C controller.
> +
> +	  If you don't know what to do here, say N.
> +
>  config I2C_BCM_KONA
>  	tristate "BCM Kona I2C adapter"
>  	depends on ARCH_BCM_MOBILE
> diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
> index 5e6c822..216e7be 100644
> --- a/drivers/i2c/busses/Makefile
> +++ b/drivers/i2c/busses/Makefile
> @@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
>  obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
>  obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
>  obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
> +obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
>  obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
>  obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
>  obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
> diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
> new file mode 100644
> index 0000000..35ac497
> --- /dev/null
> +++ b/drivers/i2c/busses/i2c-bcm-iproc.c
> @@ -0,0 +1,500 @@
> +/*
> + * Copyright (C) 2014 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/device.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/sched.h>
> +#include <linux/i2c.h>
> +#include <linux/interrupt.h>
> +#include <linux/platform_device.h>
> +#include <linux/clk.h>
> +#include <linux/io.h>
> +#include <linux/slab.h>
> +#include <linux/delay.h>
> +
> +#define CFG_OFFSET                   0x00
> +#define CFG_RESET_SHIFT              31
> +#define CFG_EN_SHIFT                 30
> +#define CFG_M_RETRY_CNT_SHIFT        16
> +#define CFG_M_RETRY_CNT_MASK         0x0f
> +
> +#define TIM_CFG_OFFSET               0x04
> +#define TIME_CFG_MODE_400_SHIFT      31
> +
> +#define M_FIFO_CTRL_OFFSET           0x0c
> +#define M_FIFO_RX_FLUSH_SHIFT        31
> +#define M_FIFO_TX_FLUSH_SHIFT        30
> +#define M_FIFO_RX_CNT_SHIFT          16
> +#define M_FIFO_RX_CNT_MASK           0x7f
> +#define M_FIFO_RX_THLD_SHIFT         8
> +#define M_FIFO_RX_THLD_MASK          0x3f
> +
> +#define M_CMD_OFFSET                 0x30
> +#define M_CMD_START_BUSY_SHIFT       31
> +#define M_CMD_STATUS_SHIFT           25
> +#define M_CMD_STATUS_MASK            0x07
> +#define M_CMD_STATUS_SUCCESS         0x0
> +#define M_CMD_STATUS_LOST_ARB        0x1
> +#define M_CMD_STATUS_NACK_ADDR       0x2
> +#define M_CMD_STATUS_NACK_DATA       0x3
> +#define M_CMD_STATUS_TIMEOUT         0x4
> +#define M_CMD_PROTOCOL_SHIFT         9
> +#define M_CMD_PROTOCOL_MASK          0xf
> +#define M_CMD_PROTOCOL_BLK_WR        0x7
> +#define M_CMD_PROTOCOL_BLK_RD        0x8
> +#define M_CMD_PEC_SHIFT              8
> +#define M_CMD_RD_CNT_SHIFT           0
> +#define M_CMD_RD_CNT_MASK            0xff
> +
> +#define IE_OFFSET                    0x38
> +#define IE_M_RX_FIFO_FULL_SHIFT      31
> +#define IE_M_RX_THLD_SHIFT           30
> +#define IE_M_START_BUSY_SHIFT        28
> +
> +#define IS_OFFSET                    0x3c
> +#define IS_M_RX_FIFO_FULL_SHIFT      31
> +#define IS_M_RX_THLD_SHIFT           30
> +#define IS_M_START_BUSY_SHIFT        28
> +
> +#define M_TX_OFFSET                  0x40
> +#define M_TX_WR_STATUS_SHIFT         31
> +#define M_TX_DATA_SHIFT              0
> +#define M_TX_DATA_MASK               0xff
> +
> +#define M_RX_OFFSET                  0x44
> +#define M_RX_STATUS_SHIFT            30
> +#define M_RX_STATUS_MASK             0x03
> +#define M_RX_PEC_ERR_SHIFT           29
> +#define M_RX_DATA_SHIFT              0
> +#define M_RX_DATA_MASK               0xff
> +
> +#define I2C_TIMEOUT_MESC             100
> +#define M_TX_RX_FIFO_SIZE            64
> +
> +enum bus_speed_index {
> +	I2C_SPD_100K = 0,
> +	I2C_SPD_400K,
> +};
> +
> +struct bcm_iproc_i2c_dev {
> +	struct device *device;
> +
> +	void __iomem *base;
> +	struct i2c_msg *msg;
> +
> +	struct i2c_adapter adapter;
> +
> +	struct completion done;
> +};
> +
> +/*
> + * Can be expanded in the future if more interrupt status bits are utilized
> + */
> +#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
> +
> +static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
> +{
> +	struct bcm_iproc_i2c_dev *dev = data;
> +	u32 status = readl(dev->base + IS_OFFSET);
> +
> +	status &= ISR_MASK;
> +
> +	if (!status)
> +		return IRQ_NONE;
> +
> +	writel(status, dev->base + IS_OFFSET);
> +	complete_all(&dev->done);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static int __wait_for_bus_idle(struct bcm_iproc_i2c_dev *dev)
> +{
> +	unsigned long timeout = jiffies + msecs_to_jiffies(I2C_TIMEOUT_MESC);
> +
> +	while (readl(dev->base + M_CMD_OFFSET) &
> +			(1 << M_CMD_START_BUSY_SHIFT)) {
> +		if (time_after(jiffies, timeout)) {
> +			dev_err(dev->device, "wait for bus idle timeout\n");
> +			return -ETIMEDOUT;
> +		}
Add a call to cpu_relax here. Do you really need a tight loop here?

> +	}
> +
> +	return 0;
> +}
> +
> +static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *dev,
> +				     struct i2c_msg *msg, u8 *addr)
> +{
> +
> +	if (msg->flags & I2C_M_TEN) {
> +		dev_err(dev->device, "no support for 10-bit address\n");
> +		return -EINVAL;
> +	}
> +
> +	*addr = (msg->addr << 1) & 0xfe;
I don't see what difference the & 0xfe makes. I think you can drop that.

> +
> +	if (msg->flags & I2C_M_RD)
> +		*addr |= 1;
> +
> +	return 0;
> +}
> +
> +static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *dev)
> +{
> +	u32 val;
> +
> +	val = readl(dev->base + M_CMD_OFFSET);
> +	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
> +
> +	switch (val) {
> +	case M_CMD_STATUS_SUCCESS:
> +		return 0;
> +
> +	case M_CMD_STATUS_LOST_ARB:
> +		dev_err(dev->device, "lost bus arbitration\n");
I wouldn't dev_err that, only dev_dbg. I'm not sure how usual the errors
for the next two cases is, maybe degrade them to dev_dbg, too?

> +		return -EREMOTEIO;
> +
> +	case M_CMD_STATUS_NACK_ADDR:
> +		dev_err(dev->device, "NAK addr:0x%02x\n", dev->msg->addr);
> +		return -EREMOTEIO;
> +
> +	case M_CMD_STATUS_NACK_DATA:
> +		dev_err(dev->device, "NAK data\n");
> +		return -EREMOTEIO;
> +
> +	case M_CMD_STATUS_TIMEOUT:
> +		dev_err(dev->device, "bus timeout\n");
> +		return -ETIMEDOUT;
> +
> +	default:
> +		dev_err(dev->device, "unknown error code=%d\n", val);
> +		return -EREMOTEIO;
> +	}
> +
> +	return -EREMOTEIO;
> +}
> +
> +static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *dev,
> +					 struct i2c_msg *msg)
> +{
> +	int ret, i;
> +	u8 addr;
> +	u32 val;
> +	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
> +
> +	if (msg->len < 1 || msg->len > M_TX_RX_FIFO_SIZE - 1) {
> +		dev_err(dev->device,
> +			"supported data length is 1 - %u bytes\n",
> +				M_TX_RX_FIFO_SIZE - 1);
> +		return -EINVAL;
> +	}
> +
> +	dev->msg = msg;
> +	ret = __wait_for_bus_idle(dev);
> +	if (ret)
> +		return ret;
> +
> +	ret = bcm_iproc_i2c_format_addr(dev, msg, &addr);
> +	if (ret)
> +		return ret;
> +
> +	/* load slave address into the TX FIFO */
> +	writel(addr, dev->base + M_TX_OFFSET);
> +
> +	/* for a write transaction, load data into the TX FIFO */
> +	if (!(msg->flags & I2C_M_RD)) {
> +		for (i = 0; i < msg->len; i++) {
> +			val = msg->buf[i];
> +
> +			/* mark the last byte */
> +			if (i == msg->len - 1)
> +				val |= 1 << M_TX_WR_STATUS_SHIFT;
> +
> +			writel(val, dev->base + M_TX_OFFSET);
> +		}
> +	}
> +
> +	/* mark as incomplete before starting the transaction */
> +	reinit_completion(&dev->done);
> +
> +	/*
> +	 * Enable the "start busy" interrupt, which will be triggered after
> +	 * the transaction is done
This sound's wrong. I'd expect "start busy" to trigger as soon as the
controller gets hold of the bus.

> +	 */
> +	writel(1 << IE_M_START_BUSY_SHIFT, dev->base + IE_OFFSET);
> +
> +	/*
> +	 * Now we can activate the transfer. For a read operation, specify the
> +	 * number of bytes to read
> +	 */
> +	val = 1 << M_CMD_START_BUSY_SHIFT;
> +	if (msg->flags & I2C_M_RD) {
> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
> +			(msg->len << M_CMD_RD_CNT_SHIFT);
> +	} else {
> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
> +	}
> +	writel(val, dev->base + M_CMD_OFFSET);
> +
> +	time_left = wait_for_completion_timeout(&dev->done, time_left);
> +
> +	/* disable all interrupts */
> +	writel(0, dev->base + IE_OFFSET);
> +
> +	if (!time_left) {
> +		dev_err(dev->device, "transaction times out\n");
> +
> +		/* flush FIFOs */
> +		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
> +			(1 << M_FIFO_TX_FLUSH_SHIFT);
> +		writel(val, dev->base + M_FIFO_CTRL_OFFSET);
> +		return -EREMOTEIO;
> +	}
> +
> +	ret = bcm_iproc_i2c_check_status(dev);
> +	if (ret) {
> +		/* flush both TX/RX FIFOs */
> +		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
> +			(1 << M_FIFO_TX_FLUSH_SHIFT);
> +		writel(val, dev->base + M_FIFO_CTRL_OFFSET);
> +		return ret;
> +	}
> +
> +	/*
> +	 * For a read operation, we now need to load the data from FIFO
> +	 * into the memory buffer
> +	 */
> +	if (msg->flags & I2C_M_RD) {
> +		for (i = 0; i < msg->len; i++) {
> +			msg->buf[i] = (readl(dev->base + M_RX_OFFSET) >>
> +					M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
> +		}
> +	}
> +
> +	dev_dbg(dev->device, "xfer %c, addr=0x%02x, len=%d\n",
> +			(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
> +			msg->len);
> +	dev_dbg(dev->device, "**** data start ****\n");
> +	for (i = 0; i < msg->len; i++)
> +		dev_dbg(dev->device, "0x%02x ",  msg->buf[i]);
> +	dev_dbg(dev->device, "**** data end ****\n");
> +
> +	return 0;
> +}
> +
> +static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
> +			      struct i2c_msg msgs[], int num)
> +{
> +	struct bcm_iproc_i2c_dev *dev = i2c_get_adapdata(adapter);
> +	int ret, i;
> +
> +	/* go through all messages */
> +	for (i = 0; i < num; i++) {
> +		ret = bcm_iproc_i2c_xfer_single_msg(dev, &msgs[i]);
> +		if (ret) {
> +			dev_err(dev->device, "xfer failed\n");
> +			return ret;
> +		}
> +	}
> +
> +	return num;
> +}
> +
> +static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
> +{
> +	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
> +}
> +
> +static const struct i2c_algorithm bcm_iproc_algo = {
> +	.master_xfer = bcm_iproc_i2c_xfer,
> +	.functionality = bcm_iproc_i2c_functionality,
> +};
> +
> +static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *dev)
> +{
> +	unsigned int bus_speed, speed_bit;
> +	u32 val;
> +	int ret = of_property_read_u32(dev->device->of_node, "clock-frequency",
> +				       &bus_speed);
Inconsistent coding style. At most other places you use 2 tabs to indent
a continued line. (Well you use this style for breaks in function
declarations. Using the same style for both cases would be nice.)

> +	if (ret < 0) {
> +		dev_err(dev->device, "missing clock-frequency property\n");
> +		return -ENODEV;
> +	}
> +
> +	switch (bus_speed) {
> +	case 100000:
> +		speed_bit = 0;
> +		break;
> +	case 400000:
> +		speed_bit = 1;
> +		break;
> +	default:
> +		dev_err(dev->device, "%d Hz bus speed not supported\n",
> +				bus_speed);
> +		dev_err(dev->device, "valid speeds are 100khz and 400khz\n");
> +		return -EINVAL;
> +	}
I'd be more graceful here:

	if (bus_speed < 100000)
		error_out;
	else if (bus_speed < 400000)
		speed_bit = 0;
	else
		/* >= 400000 */
		speed_bit = 1;

> +
> +	val = readl(dev->base + TIM_CFG_OFFSET);
> +	val &= ~(1 << TIME_CFG_MODE_400_SHIFT);
> +	val |= speed_bit << TIME_CFG_MODE_400_SHIFT;
> +	writel(val, dev->base + TIM_CFG_OFFSET);
> +
> +	dev_info(dev->device, "bus set to %u Hz\n", bus_speed);
> +
> +	return 0;
> +}
> +
> +static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *dev)
> +{
> +	u32 val;
> +
> +	/* put controller in reset */
> +	val = readl(dev->base + CFG_OFFSET);
> +	val |= 1 << CFG_RESET_SHIFT;
> +	val &= ~(1 << CFG_EN_SHIFT);
> +	writel(val, dev->base + CFG_OFFSET);
> +
> +	/* wait 100 usec per spec */
> +	udelay(100);
> +
> +	/* bring controller out of reset */
> +	val = readl(dev->base + CFG_OFFSET);
Is it necessary to reread the register value here?

> +	val &= ~(1 << CFG_RESET_SHIFT);
> +	writel(val, dev->base + CFG_OFFSET);
> +
> +	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
> +	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
> +	writel(val, dev->base + M_FIFO_CTRL_OFFSET);
> +
> +	/* disable all interrupts */
> +	val = 0;
> +	writel(val, dev->base + IE_OFFSET);
writel(0, dev->base + IE_OFFSET);

> +	/* clear all pending interrupts */
> +	val = readl(dev->base + IS_OFFSET);
> +	writel(val, dev->base + IS_OFFSET);
writel(0xffffffff, dev->base + IS_OFFSET); ??

> +
> +	return 0;
> +}
> +
> +static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *dev)
> +{
> +	u32 val;
> +
> +	val = readl(dev->base + CFG_OFFSET);
> +	val |= 1 << CFG_EN_SHIFT;
> +	writel(val, dev->base + CFG_OFFSET);
> +}
> +
> +static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *dev)
> +{
> +	u32 val;
> +
> +	val = readl(dev->base + CFG_OFFSET);
> +	val &= ~(1 << CFG_EN_SHIFT);
> +	writel(val, dev->base + CFG_OFFSET);
> +}
> +
> +static int bcm_iproc_i2c_probe(struct platform_device *pdev)
> +{
> +	int irq, ret = 0;
> +	struct bcm_iproc_i2c_dev *dev;
"dev" is a misleading name here. I'd call this

	bcm_iproc_i2c_ddata *ddata;

> +	struct i2c_adapter *adap;
> +	struct resource *res;
> +
> +	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
> +	if (!dev)
> +		return -ENOMEM;
> +
> +	platform_set_drvdata(pdev, dev);
> +	dev->device = &pdev->dev;
> +	init_completion(&dev->done);
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	dev->base = devm_ioremap_resource(dev->device, res);
> +	if (IS_ERR(dev->base))
> +		return -ENOMEM;
		return PTR_ERR(dev->base);

> +
> +	ret = bcm_iproc_i2c_init(dev);
> +	if (ret)
> +		return ret;
> +
> +	ret = bcm_iproc_i2c_cfg_speed(dev);
> +	if (ret)
> +		return ret;
> +
> +	irq = platform_get_irq(pdev, 0);
> +	if (irq < 0) {
irq == 0 should be handled as error, too.

> +		dev_err(dev->device, "no irq resource\n");
> +		return irq;
> +	}
> +
> +	ret = devm_request_irq(&pdev->dev, irq, bcm_iproc_i2c_isr,
> +			IRQF_SHARED, pdev->name, dev);
> +	if (ret) {
> +		dev_err(dev->device, "unable to request irq %i\n", irq);
> +		return ret;
> +	}
> +
> +	bcm_iproc_i2c_enable(dev);
> +
> +	adap = &dev->adapter;
> +	i2c_set_adapdata(adap, dev);
> +	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
> +	adap->algo = &bcm_iproc_algo;
> +	adap->dev.parent = &pdev->dev;
> +	adap->dev.of_node = pdev->dev.of_node;
> +
> +	ret = i2c_add_adapter(adap);
> +	if (ret) {
> +		dev_err(dev->device, "failed to add adapter\n");
> +		return ret;
> +	}
> +
> +	dev_info(dev->device, "device registered successfully\n");
This just clutters the boot log. Please remove.

> +
> +	return 0;
> +}
> +
> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
> +{
> +	struct bcm_iproc_i2c_dev *dev = platform_get_drvdata(pdev);
> +
> +	i2c_del_adapter(&dev->adapter);
> +	bcm_iproc_i2c_disable(dev);
I think you have a problem here if bcm_iproc_i2c_remove is called while
an irq is still being serviced. I'm not sure how to prevent this
properly for a shared interrupt.

> +
> +	return 0;
> +}
> +
> +static const struct of_device_id bcm_iproc_i2c_of_match[] = {
> +	{.compatible = "brcm,iproc-i2c",},
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
> +
> +static struct platform_driver bcm_iproc_i2c_driver = {
> +	.driver = {
> +		   .name = "bcm-iproc-i2c",
> +		   .of_match_table = bcm_iproc_i2c_of_match,
> +		   },
Inconsistent indention.

> +	.probe = bcm_iproc_i2c_probe,
> +	.remove = bcm_iproc_i2c_remove,
> +};
> +module_platform_driver(bcm_iproc_i2c_driver);
> +
> +MODULE_AUTHOR("Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>");
> +MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
> +MODULE_LICENSE("GPL v2");

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

[PATCH v3 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Uwe Kleine-König]

Hello,

On Tue, Dec 09, 2014 at 07:57:11PM -0800, Ray Jui wrote:
> Add initial support to the Broadcom iProc I2C controller found in the
> iProc family of SoCs.
> 
> The iProc I2C controller has separate internal TX and RX FIFOs, each has
> a size of 64 bytes. The iProc I2C controller supports two bus speeds
> including standard mode (100kHz) and fast mode (400kHz)
> 
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> ---
>  drivers/i2c/busses/Kconfig         |   10 +
>  drivers/i2c/busses/Makefile        |    1 +
>  drivers/i2c/busses/i2c-bcm-iproc.c |  500 ++++++++++++++++++++++++++++++++++++
>  3 files changed, 511 insertions(+)
>  create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c
> 
> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
> index c1351d9..df21366 100644
> --- a/drivers/i2c/busses/Kconfig
> +++ b/drivers/i2c/busses/Kconfig
> @@ -372,6 +372,16 @@ config I2C_BCM2835
>  	  This support is also available as a module.  If so, the module
>  	  will be called i2c-bcm2835.
>  
> +config I2C_BCM_IPROC
> +	tristate "Broadcom iProc I2C controller"
> +	depends on ARCH_BCM_IPROC
> +	default y
It would be nice to have the following here to improve compile coverage
testing:

	depends on ARCH_BCM_IPROC || COMPILE_TEST
	default ARCH_BCM_IPROC

> +	help
> +	  If you say yes to this option, support will be included for the
> +	  Broadcom iProc I2C controller.
> +
> +	  If you don't know what to do here, say N.
> +
>  config I2C_BCM_KONA
>  	tristate "BCM Kona I2C adapter"
>  	depends on ARCH_BCM_MOBILE
> diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
> index 5e6c822..216e7be 100644
> --- a/drivers/i2c/busses/Makefile
> +++ b/drivers/i2c/busses/Makefile
> @@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
>  obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
>  obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
>  obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
> +obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
>  obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
>  obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
>  obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
> diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
> new file mode 100644
> index 0000000..35ac497
> --- /dev/null
> +++ b/drivers/i2c/busses/i2c-bcm-iproc.c
> @@ -0,0 +1,500 @@
> +/*
> + * Copyright (C) 2014 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/device.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/sched.h>
> +#include <linux/i2c.h>
> +#include <linux/interrupt.h>
> +#include <linux/platform_device.h>
> +#include <linux/clk.h>
> +#include <linux/io.h>
> +#include <linux/slab.h>
> +#include <linux/delay.h>
> +
> +#define CFG_OFFSET                   0x00
> +#define CFG_RESET_SHIFT              31
> +#define CFG_EN_SHIFT                 30
> +#define CFG_M_RETRY_CNT_SHIFT        16
> +#define CFG_M_RETRY_CNT_MASK         0x0f
> +
> +#define TIM_CFG_OFFSET               0x04
> +#define TIME_CFG_MODE_400_SHIFT      31
> +
> +#define M_FIFO_CTRL_OFFSET           0x0c
> +#define M_FIFO_RX_FLUSH_SHIFT        31
> +#define M_FIFO_TX_FLUSH_SHIFT        30
> +#define M_FIFO_RX_CNT_SHIFT          16
> +#define M_FIFO_RX_CNT_MASK           0x7f
> +#define M_FIFO_RX_THLD_SHIFT         8
> +#define M_FIFO_RX_THLD_MASK          0x3f
> +
> +#define M_CMD_OFFSET                 0x30
> +#define M_CMD_START_BUSY_SHIFT       31
> +#define M_CMD_STATUS_SHIFT           25
> +#define M_CMD_STATUS_MASK            0x07
> +#define M_CMD_STATUS_SUCCESS         0x0
> +#define M_CMD_STATUS_LOST_ARB        0x1
> +#define M_CMD_STATUS_NACK_ADDR       0x2
> +#define M_CMD_STATUS_NACK_DATA       0x3
> +#define M_CMD_STATUS_TIMEOUT         0x4
> +#define M_CMD_PROTOCOL_SHIFT         9
> +#define M_CMD_PROTOCOL_MASK          0xf
> +#define M_CMD_PROTOCOL_BLK_WR        0x7
> +#define M_CMD_PROTOCOL_BLK_RD        0x8
> +#define M_CMD_PEC_SHIFT              8
> +#define M_CMD_RD_CNT_SHIFT           0
> +#define M_CMD_RD_CNT_MASK            0xff
> +
> +#define IE_OFFSET                    0x38
> +#define IE_M_RX_FIFO_FULL_SHIFT      31
> +#define IE_M_RX_THLD_SHIFT           30
> +#define IE_M_START_BUSY_SHIFT        28
> +
> +#define IS_OFFSET                    0x3c
> +#define IS_M_RX_FIFO_FULL_SHIFT      31
> +#define IS_M_RX_THLD_SHIFT           30
> +#define IS_M_START_BUSY_SHIFT        28
> +
> +#define M_TX_OFFSET                  0x40
> +#define M_TX_WR_STATUS_SHIFT         31
> +#define M_TX_DATA_SHIFT              0
> +#define M_TX_DATA_MASK               0xff
> +
> +#define M_RX_OFFSET                  0x44
> +#define M_RX_STATUS_SHIFT            30
> +#define M_RX_STATUS_MASK             0x03
> +#define M_RX_PEC_ERR_SHIFT           29
> +#define M_RX_DATA_SHIFT              0
> +#define M_RX_DATA_MASK               0xff
> +
> +#define I2C_TIMEOUT_MESC             100
> +#define M_TX_RX_FIFO_SIZE            64
> +
> +enum bus_speed_index {
> +	I2C_SPD_100K = 0,
> +	I2C_SPD_400K,
> +};
> +
> +struct bcm_iproc_i2c_dev {
> +	struct device *device;
> +
> +	void __iomem *base;
> +	struct i2c_msg *msg;
> +
> +	struct i2c_adapter adapter;
> +
> +	struct completion done;
> +};
> +
> +/*
> + * Can be expanded in the future if more interrupt status bits are utilized
> + */
> +#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
> +
> +static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
> +{
> +	struct bcm_iproc_i2c_dev *dev = data;
> +	u32 status = readl(dev->base + IS_OFFSET);
> +
> +	status &= ISR_MASK;
> +
> +	if (!status)
> +		return IRQ_NONE;
> +
> +	writel(status, dev->base + IS_OFFSET);
> +	complete_all(&dev->done);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static int __wait_for_bus_idle(struct bcm_iproc_i2c_dev *dev)
> +{
> +	unsigned long timeout = jiffies + msecs_to_jiffies(I2C_TIMEOUT_MESC);
> +
> +	while (readl(dev->base + M_CMD_OFFSET) &
> +			(1 << M_CMD_START_BUSY_SHIFT)) {
> +		if (time_after(jiffies, timeout)) {
> +			dev_err(dev->device, "wait for bus idle timeout\n");
> +			return -ETIMEDOUT;
> +		}
Add a call to cpu_relax here. Do you really need a tight loop here?

> +	}
> +
> +	return 0;
> +}
> +
> +static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *dev,
> +				     struct i2c_msg *msg, u8 *addr)
> +{
> +
> +	if (msg->flags & I2C_M_TEN) {
> +		dev_err(dev->device, "no support for 10-bit address\n");
> +		return -EINVAL;
> +	}
> +
> +	*addr = (msg->addr << 1) & 0xfe;
I don't see what difference the & 0xfe makes. I think you can drop that.

> +
> +	if (msg->flags & I2C_M_RD)
> +		*addr |= 1;
> +
> +	return 0;
> +}
> +
> +static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *dev)
> +{
> +	u32 val;
> +
> +	val = readl(dev->base + M_CMD_OFFSET);
> +	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
> +
> +	switch (val) {
> +	case M_CMD_STATUS_SUCCESS:
> +		return 0;
> +
> +	case M_CMD_STATUS_LOST_ARB:
> +		dev_err(dev->device, "lost bus arbitration\n");
I wouldn't dev_err that, only dev_dbg. I'm not sure how usual the errors
for the next two cases is, maybe degrade them to dev_dbg, too?

> +		return -EREMOTEIO;
> +
> +	case M_CMD_STATUS_NACK_ADDR:
> +		dev_err(dev->device, "NAK addr:0x%02x\n", dev->msg->addr);
> +		return -EREMOTEIO;
> +
> +	case M_CMD_STATUS_NACK_DATA:
> +		dev_err(dev->device, "NAK data\n");
> +		return -EREMOTEIO;
> +
> +	case M_CMD_STATUS_TIMEOUT:
> +		dev_err(dev->device, "bus timeout\n");
> +		return -ETIMEDOUT;
> +
> +	default:
> +		dev_err(dev->device, "unknown error code=%d\n", val);
> +		return -EREMOTEIO;
> +	}
> +
> +	return -EREMOTEIO;
> +}
> +
> +static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *dev,
> +					 struct i2c_msg *msg)
> +{
> +	int ret, i;
> +	u8 addr;
> +	u32 val;
> +	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
> +
> +	if (msg->len < 1 || msg->len > M_TX_RX_FIFO_SIZE - 1) {
> +		dev_err(dev->device,
> +			"supported data length is 1 - %u bytes\n",
> +				M_TX_RX_FIFO_SIZE - 1);
> +		return -EINVAL;
> +	}
> +
> +	dev->msg = msg;
> +	ret = __wait_for_bus_idle(dev);
> +	if (ret)
> +		return ret;
> +
> +	ret = bcm_iproc_i2c_format_addr(dev, msg, &addr);
> +	if (ret)
> +		return ret;
> +
> +	/* load slave address into the TX FIFO */
> +	writel(addr, dev->base + M_TX_OFFSET);
> +
> +	/* for a write transaction, load data into the TX FIFO */
> +	if (!(msg->flags & I2C_M_RD)) {
> +		for (i = 0; i < msg->len; i++) {
> +			val = msg->buf[i];
> +
> +			/* mark the last byte */
> +			if (i == msg->len - 1)
> +				val |= 1 << M_TX_WR_STATUS_SHIFT;
> +
> +			writel(val, dev->base + M_TX_OFFSET);
> +		}
> +	}
> +
> +	/* mark as incomplete before starting the transaction */
> +	reinit_completion(&dev->done);
> +
> +	/*
> +	 * Enable the "start busy" interrupt, which will be triggered after
> +	 * the transaction is done
This sound's wrong. I'd expect "start busy" to trigger as soon as the
controller gets hold of the bus.

> +	 */
> +	writel(1 << IE_M_START_BUSY_SHIFT, dev->base + IE_OFFSET);
> +
> +	/*
> +	 * Now we can activate the transfer. For a read operation, specify the
> +	 * number of bytes to read
> +	 */
> +	val = 1 << M_CMD_START_BUSY_SHIFT;
> +	if (msg->flags & I2C_M_RD) {
> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
> +			(msg->len << M_CMD_RD_CNT_SHIFT);
> +	} else {
> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
> +	}
> +	writel(val, dev->base + M_CMD_OFFSET);
> +
> +	time_left = wait_for_completion_timeout(&dev->done, time_left);
> +
> +	/* disable all interrupts */
> +	writel(0, dev->base + IE_OFFSET);
> +
> +	if (!time_left) {
> +		dev_err(dev->device, "transaction times out\n");
> +
> +		/* flush FIFOs */
> +		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
> +			(1 << M_FIFO_TX_FLUSH_SHIFT);
> +		writel(val, dev->base + M_FIFO_CTRL_OFFSET);
> +		return -EREMOTEIO;
> +	}
> +
> +	ret = bcm_iproc_i2c_check_status(dev);
> +	if (ret) {
> +		/* flush both TX/RX FIFOs */
> +		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
> +			(1 << M_FIFO_TX_FLUSH_SHIFT);
> +		writel(val, dev->base + M_FIFO_CTRL_OFFSET);
> +		return ret;
> +	}
> +
> +	/*
> +	 * For a read operation, we now need to load the data from FIFO
> +	 * into the memory buffer
> +	 */
> +	if (msg->flags & I2C_M_RD) {
> +		for (i = 0; i < msg->len; i++) {
> +			msg->buf[i] = (readl(dev->base + M_RX_OFFSET) >>
> +					M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
> +		}
> +	}
> +
> +	dev_dbg(dev->device, "xfer %c, addr=0x%02x, len=%d\n",
> +			(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
> +			msg->len);
> +	dev_dbg(dev->device, "**** data start ****\n");
> +	for (i = 0; i < msg->len; i++)
> +		dev_dbg(dev->device, "0x%02x ",  msg->buf[i]);
> +	dev_dbg(dev->device, "**** data end ****\n");
> +
> +	return 0;
> +}
> +
> +static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
> +			      struct i2c_msg msgs[], int num)
> +{
> +	struct bcm_iproc_i2c_dev *dev = i2c_get_adapdata(adapter);
> +	int ret, i;
> +
> +	/* go through all messages */
> +	for (i = 0; i < num; i++) {
> +		ret = bcm_iproc_i2c_xfer_single_msg(dev, &msgs[i]);
> +		if (ret) {
> +			dev_err(dev->device, "xfer failed\n");
> +			return ret;
> +		}
> +	}
> +
> +	return num;
> +}
> +
> +static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
> +{
> +	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
> +}
> +
> +static const struct i2c_algorithm bcm_iproc_algo = {
> +	.master_xfer = bcm_iproc_i2c_xfer,
> +	.functionality = bcm_iproc_i2c_functionality,
> +};
> +
> +static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *dev)
> +{
> +	unsigned int bus_speed, speed_bit;
> +	u32 val;
> +	int ret = of_property_read_u32(dev->device->of_node, "clock-frequency",
> +				       &bus_speed);
Inconsistent coding style. At most other places you use 2 tabs to indent
a continued line. (Well you use this style for breaks in function
declarations. Using the same style for both cases would be nice.)

> +	if (ret < 0) {
> +		dev_err(dev->device, "missing clock-frequency property\n");
> +		return -ENODEV;
> +	}
> +
> +	switch (bus_speed) {
> +	case 100000:
> +		speed_bit = 0;
> +		break;
> +	case 400000:
> +		speed_bit = 1;
> +		break;
> +	default:
> +		dev_err(dev->device, "%d Hz bus speed not supported\n",
> +				bus_speed);
> +		dev_err(dev->device, "valid speeds are 100khz and 400khz\n");
> +		return -EINVAL;
> +	}
I'd be more graceful here:

	if (bus_speed < 100000)
		error_out;
	else if (bus_speed < 400000)
		speed_bit = 0;
	else
		/* >= 400000 */
		speed_bit = 1;

> +
> +	val = readl(dev->base + TIM_CFG_OFFSET);
> +	val &= ~(1 << TIME_CFG_MODE_400_SHIFT);
> +	val |= speed_bit << TIME_CFG_MODE_400_SHIFT;
> +	writel(val, dev->base + TIM_CFG_OFFSET);
> +
> +	dev_info(dev->device, "bus set to %u Hz\n", bus_speed);
> +
> +	return 0;
> +}
> +
> +static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *dev)
> +{
> +	u32 val;
> +
> +	/* put controller in reset */
> +	val = readl(dev->base + CFG_OFFSET);
> +	val |= 1 << CFG_RESET_SHIFT;
> +	val &= ~(1 << CFG_EN_SHIFT);
> +	writel(val, dev->base + CFG_OFFSET);
> +
> +	/* wait 100 usec per spec */
> +	udelay(100);
> +
> +	/* bring controller out of reset */
> +	val = readl(dev->base + CFG_OFFSET);
Is it necessary to reread the register value here?

> +	val &= ~(1 << CFG_RESET_SHIFT);
> +	writel(val, dev->base + CFG_OFFSET);
> +
> +	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
> +	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
> +	writel(val, dev->base + M_FIFO_CTRL_OFFSET);
> +
> +	/* disable all interrupts */
> +	val = 0;
> +	writel(val, dev->base + IE_OFFSET);
writel(0, dev->base + IE_OFFSET);

> +	/* clear all pending interrupts */
> +	val = readl(dev->base + IS_OFFSET);
> +	writel(val, dev->base + IS_OFFSET);
writel(0xffffffff, dev->base + IS_OFFSET); ??

> +
> +	return 0;
> +}
> +
> +static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *dev)
> +{
> +	u32 val;
> +
> +	val = readl(dev->base + CFG_OFFSET);
> +	val |= 1 << CFG_EN_SHIFT;
> +	writel(val, dev->base + CFG_OFFSET);
> +}
> +
> +static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *dev)
> +{
> +	u32 val;
> +
> +	val = readl(dev->base + CFG_OFFSET);
> +	val &= ~(1 << CFG_EN_SHIFT);
> +	writel(val, dev->base + CFG_OFFSET);
> +}
> +
> +static int bcm_iproc_i2c_probe(struct platform_device *pdev)
> +{
> +	int irq, ret = 0;
> +	struct bcm_iproc_i2c_dev *dev;
"dev" is a misleading name here. I'd call this

	bcm_iproc_i2c_ddata *ddata;

> +	struct i2c_adapter *adap;
> +	struct resource *res;
> +
> +	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
> +	if (!dev)
> +		return -ENOMEM;
> +
> +	platform_set_drvdata(pdev, dev);
> +	dev->device = &pdev->dev;
> +	init_completion(&dev->done);
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	dev->base = devm_ioremap_resource(dev->device, res);
> +	if (IS_ERR(dev->base))
> +		return -ENOMEM;
		return PTR_ERR(dev->base);

> +
> +	ret = bcm_iproc_i2c_init(dev);
> +	if (ret)
> +		return ret;
> +
> +	ret = bcm_iproc_i2c_cfg_speed(dev);
> +	if (ret)
> +		return ret;
> +
> +	irq = platform_get_irq(pdev, 0);
> +	if (irq < 0) {
irq == 0 should be handled as error, too.

> +		dev_err(dev->device, "no irq resource\n");
> +		return irq;
> +	}
> +
> +	ret = devm_request_irq(&pdev->dev, irq, bcm_iproc_i2c_isr,
> +			IRQF_SHARED, pdev->name, dev);
> +	if (ret) {
> +		dev_err(dev->device, "unable to request irq %i\n", irq);
> +		return ret;
> +	}
> +
> +	bcm_iproc_i2c_enable(dev);
> +
> +	adap = &dev->adapter;
> +	i2c_set_adapdata(adap, dev);
> +	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
> +	adap->algo = &bcm_iproc_algo;
> +	adap->dev.parent = &pdev->dev;
> +	adap->dev.of_node = pdev->dev.of_node;
> +
> +	ret = i2c_add_adapter(adap);
> +	if (ret) {
> +		dev_err(dev->device, "failed to add adapter\n");
> +		return ret;
> +	}
> +
> +	dev_info(dev->device, "device registered successfully\n");
This just clutters the boot log. Please remove.

> +
> +	return 0;
> +}
> +
> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
> +{
> +	struct bcm_iproc_i2c_dev *dev = platform_get_drvdata(pdev);
> +
> +	i2c_del_adapter(&dev->adapter);
> +	bcm_iproc_i2c_disable(dev);
I think you have a problem here if bcm_iproc_i2c_remove is called while
an irq is still being serviced. I'm not sure how to prevent this
properly for a shared interrupt.

> +
> +	return 0;
> +}
> +
> +static const struct of_device_id bcm_iproc_i2c_of_match[] = {
> +	{.compatible = "brcm,iproc-i2c",},
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
> +
> +static struct platform_driver bcm_iproc_i2c_driver = {
> +	.driver = {
> +		   .name = "bcm-iproc-i2c",
> +		   .of_match_table = bcm_iproc_i2c_of_match,
> +		   },
Inconsistent indention.

> +	.probe = bcm_iproc_i2c_probe,
> +	.remove = bcm_iproc_i2c_remove,
> +};
> +module_platform_driver(bcm_iproc_i2c_driver);
> +
> +MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
> +MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
> +MODULE_LICENSE("GPL v2");

-- 
Pengutronix e.K.                           | Uwe Kleine-K?nig            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

Re: [PATCH v3 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/13/2015 2:50 PM, Uwe Kleine-König wrote:
> Hello,
> 
> On Tue, Dec 09, 2014 at 07:57:11PM -0800, Ray Jui wrote:
>> Add initial support to the Broadcom iProc I2C controller found in the
>> iProc family of SoCs.
>>
>> The iProc I2C controller has separate internal TX and RX FIFOs, each has
>> a size of 64 bytes. The iProc I2C controller supports two bus speeds
>> including standard mode (100kHz) and fast mode (400kHz)
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>> ---
>>  drivers/i2c/busses/Kconfig         |   10 +
>>  drivers/i2c/busses/Makefile        |    1 +
>>  drivers/i2c/busses/i2c-bcm-iproc.c |  500 ++++++++++++++++++++++++++++++++++++
>>  3 files changed, 511 insertions(+)
>>  create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c
>>
>> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
>> index c1351d9..df21366 100644
>> --- a/drivers/i2c/busses/Kconfig
>> +++ b/drivers/i2c/busses/Kconfig
>> @@ -372,6 +372,16 @@ config I2C_BCM2835
>>  	  This support is also available as a module.  If so, the module
>>  	  will be called i2c-bcm2835.
>>  
>> +config I2C_BCM_IPROC
>> +	tristate "Broadcom iProc I2C controller"
>> +	depends on ARCH_BCM_IPROC
>> +	default y
> It would be nice to have the following here to improve compile coverage
> testing:
> 
> 	depends on ARCH_BCM_IPROC || COMPILE_TEST
> 	default ARCH_BCM_IPROC
> 
Sure will do!

>> +	help
>> +	  If you say yes to this option, support will be included for the
>> +	  Broadcom iProc I2C controller.
>> +
>> +	  If you don't know what to do here, say N.
>> +
>>  config I2C_BCM_KONA
>>  	tristate "BCM Kona I2C adapter"
>>  	depends on ARCH_BCM_MOBILE
>> diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
>> index 5e6c822..216e7be 100644
>> --- a/drivers/i2c/busses/Makefile
>> +++ b/drivers/i2c/busses/Makefile
>> @@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
>>  obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
>>  obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
>>  obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
>> +obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
>>  obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
>>  obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
>>  obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
>> diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
>> new file mode 100644
>> index 0000000..35ac497
>> --- /dev/null
>> +++ b/drivers/i2c/busses/i2c-bcm-iproc.c
>> @@ -0,0 +1,500 @@
>> +/*
>> + * Copyright (C) 2014 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#include <linux/device.h>
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/sched.h>
>> +#include <linux/i2c.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/clk.h>
>> +#include <linux/io.h>
>> +#include <linux/slab.h>
>> +#include <linux/delay.h>
>> +
>> +#define CFG_OFFSET                   0x00
>> +#define CFG_RESET_SHIFT              31
>> +#define CFG_EN_SHIFT                 30
>> +#define CFG_M_RETRY_CNT_SHIFT        16
>> +#define CFG_M_RETRY_CNT_MASK         0x0f
>> +
>> +#define TIM_CFG_OFFSET               0x04
>> +#define TIME_CFG_MODE_400_SHIFT      31
>> +
>> +#define M_FIFO_CTRL_OFFSET           0x0c
>> +#define M_FIFO_RX_FLUSH_SHIFT        31
>> +#define M_FIFO_TX_FLUSH_SHIFT        30
>> +#define M_FIFO_RX_CNT_SHIFT          16
>> +#define M_FIFO_RX_CNT_MASK           0x7f
>> +#define M_FIFO_RX_THLD_SHIFT         8
>> +#define M_FIFO_RX_THLD_MASK          0x3f
>> +
>> +#define M_CMD_OFFSET                 0x30
>> +#define M_CMD_START_BUSY_SHIFT       31
>> +#define M_CMD_STATUS_SHIFT           25
>> +#define M_CMD_STATUS_MASK            0x07
>> +#define M_CMD_STATUS_SUCCESS         0x0
>> +#define M_CMD_STATUS_LOST_ARB        0x1
>> +#define M_CMD_STATUS_NACK_ADDR       0x2
>> +#define M_CMD_STATUS_NACK_DATA       0x3
>> +#define M_CMD_STATUS_TIMEOUT         0x4
>> +#define M_CMD_PROTOCOL_SHIFT         9
>> +#define M_CMD_PROTOCOL_MASK          0xf
>> +#define M_CMD_PROTOCOL_BLK_WR        0x7
>> +#define M_CMD_PROTOCOL_BLK_RD        0x8
>> +#define M_CMD_PEC_SHIFT              8
>> +#define M_CMD_RD_CNT_SHIFT           0
>> +#define M_CMD_RD_CNT_MASK            0xff
>> +
>> +#define IE_OFFSET                    0x38
>> +#define IE_M_RX_FIFO_FULL_SHIFT      31
>> +#define IE_M_RX_THLD_SHIFT           30
>> +#define IE_M_START_BUSY_SHIFT        28
>> +
>> +#define IS_OFFSET                    0x3c
>> +#define IS_M_RX_FIFO_FULL_SHIFT      31
>> +#define IS_M_RX_THLD_SHIFT           30
>> +#define IS_M_START_BUSY_SHIFT        28
>> +
>> +#define M_TX_OFFSET                  0x40
>> +#define M_TX_WR_STATUS_SHIFT         31
>> +#define M_TX_DATA_SHIFT              0
>> +#define M_TX_DATA_MASK               0xff
>> +
>> +#define M_RX_OFFSET                  0x44
>> +#define M_RX_STATUS_SHIFT            30
>> +#define M_RX_STATUS_MASK             0x03
>> +#define M_RX_PEC_ERR_SHIFT           29
>> +#define M_RX_DATA_SHIFT              0
>> +#define M_RX_DATA_MASK               0xff
>> +
>> +#define I2C_TIMEOUT_MESC             100
>> +#define M_TX_RX_FIFO_SIZE            64
>> +
>> +enum bus_speed_index {
>> +	I2C_SPD_100K = 0,
>> +	I2C_SPD_400K,
>> +};
>> +
>> +struct bcm_iproc_i2c_dev {
>> +	struct device *device;
>> +
>> +	void __iomem *base;
>> +	struct i2c_msg *msg;
>> +
>> +	struct i2c_adapter adapter;
>> +
>> +	struct completion done;
>> +};
>> +
>> +/*
>> + * Can be expanded in the future if more interrupt status bits are utilized
>> + */
>> +#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
>> +
>> +static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
>> +{
>> +	struct bcm_iproc_i2c_dev *dev = data;
>> +	u32 status = readl(dev->base + IS_OFFSET);
>> +
>> +	status &= ISR_MASK;
>> +
>> +	if (!status)
>> +		return IRQ_NONE;
>> +
>> +	writel(status, dev->base + IS_OFFSET);
>> +	complete_all(&dev->done);
>> +
>> +	return IRQ_HANDLED;
>> +}
>> +
>> +static int __wait_for_bus_idle(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +	unsigned long timeout = jiffies + msecs_to_jiffies(I2C_TIMEOUT_MESC);
>> +
>> +	while (readl(dev->base + M_CMD_OFFSET) &
>> +			(1 << M_CMD_START_BUSY_SHIFT)) {
>> +		if (time_after(jiffies, timeout)) {
>> +			dev_err(dev->device, "wait for bus idle timeout\n");
>> +			return -ETIMEDOUT;
>> +		}
> Add a call to cpu_relax here. Do you really need a tight loop here?
> 
Yes, thanks!

>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *dev,
>> +				     struct i2c_msg *msg, u8 *addr)
>> +{
>> +
>> +	if (msg->flags & I2C_M_TEN) {
>> +		dev_err(dev->device, "no support for 10-bit address\n");
>> +		return -EINVAL;
>> +	}
>> +
>> +	*addr = (msg->addr << 1) & 0xfe;
> I don't see what difference the & 0xfe makes. I think you can drop that.
> 
Yeah just see this now. Thanks!

>> +
>> +	if (msg->flags & I2C_M_RD)
>> +		*addr |= 1;
>> +
>> +	return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +	u32 val;
>> +
>> +	val = readl(dev->base + M_CMD_OFFSET);
>> +	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
>> +
>> +	switch (val) {
>> +	case M_CMD_STATUS_SUCCESS:
>> +		return 0;
>> +
>> +	case M_CMD_STATUS_LOST_ARB:
>> +		dev_err(dev->device, "lost bus arbitration\n");
> I wouldn't dev_err that, only dev_dbg. I'm not sure how usual the errors
> for the next two cases is, maybe degrade them to dev_dbg, too?
> 
These errors are rare, and it's nice to keep them at the dev_err level
so the user will be more aware.

>> +		return -EREMOTEIO;
>> +
>> +	case M_CMD_STATUS_NACK_ADDR:
>> +		dev_err(dev->device, "NAK addr:0x%02x\n", dev->msg->addr);
>> +		return -EREMOTEIO;
>> +
>> +	case M_CMD_STATUS_NACK_DATA:
>> +		dev_err(dev->device, "NAK data\n");
>> +		return -EREMOTEIO;
>> +
>> +	case M_CMD_STATUS_TIMEOUT:
>> +		dev_err(dev->device, "bus timeout\n");
>> +		return -ETIMEDOUT;
>> +
>> +	default:
>> +		dev_err(dev->device, "unknown error code=%d\n", val);
>> +		return -EREMOTEIO;
>> +	}
>> +
>> +	return -EREMOTEIO;
>> +}
>> +
>> +static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *dev,
>> +					 struct i2c_msg *msg)
>> +{
>> +	int ret, i;
>> +	u8 addr;
>> +	u32 val;
>> +	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
>> +
>> +	if (msg->len < 1 || msg->len > M_TX_RX_FIFO_SIZE - 1) {
>> +		dev_err(dev->device,
>> +			"supported data length is 1 - %u bytes\n",
>> +				M_TX_RX_FIFO_SIZE - 1);
>> +		return -EINVAL;
>> +	}
>> +
>> +	dev->msg = msg;
>> +	ret = __wait_for_bus_idle(dev);
>> +	if (ret)
>> +		return ret;
>> +
>> +	ret = bcm_iproc_i2c_format_addr(dev, msg, &addr);
>> +	if (ret)
>> +		return ret;
>> +
>> +	/* load slave address into the TX FIFO */
>> +	writel(addr, dev->base + M_TX_OFFSET);
>> +
>> +	/* for a write transaction, load data into the TX FIFO */
>> +	if (!(msg->flags & I2C_M_RD)) {
>> +		for (i = 0; i < msg->len; i++) {
>> +			val = msg->buf[i];
>> +
>> +			/* mark the last byte */
>> +			if (i == msg->len - 1)
>> +				val |= 1 << M_TX_WR_STATUS_SHIFT;
>> +
>> +			writel(val, dev->base + M_TX_OFFSET);
>> +		}
>> +	}
>> +
>> +	/* mark as incomplete before starting the transaction */
>> +	reinit_completion(&dev->done);
>> +
>> +	/*
>> +	 * Enable the "start busy" interrupt, which will be triggered after
>> +	 * the transaction is done
> This sound's wrong. I'd expect "start busy" to trigger as soon as the
> controller gets hold of the bus.
> 
Okay maybe the naming is misleading. But this is the real name used in
the register description from the datasheet. I'll add more comment in
the code to make it more clear.

Basically this enables the interrupt that triggers when the controller
internal start_busy bit transitions from 1 to 0, i.e., after a
transaction finishes. The interrupt won't be triggered when a new
transaction starts since it causes the start_busy bit to transit from 0
to 1.

>> +	 */
>> +	writel(1 << IE_M_START_BUSY_SHIFT, dev->base + IE_OFFSET);
>> +
>> +	/*
>> +	 * Now we can activate the transfer. For a read operation, specify the
>> +	 * number of bytes to read
>> +	 */
>> +	val = 1 << M_CMD_START_BUSY_SHIFT;
>> +	if (msg->flags & I2C_M_RD) {
>> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
>> +			(msg->len << M_CMD_RD_CNT_SHIFT);
>> +	} else {
>> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
>> +	}
>> +	writel(val, dev->base + M_CMD_OFFSET);
>> +
>> +	time_left = wait_for_completion_timeout(&dev->done, time_left);
>> +
>> +	/* disable all interrupts */
>> +	writel(0, dev->base + IE_OFFSET);
>> +
>> +	if (!time_left) {
>> +		dev_err(dev->device, "transaction times out\n");
>> +
>> +		/* flush FIFOs */
>> +		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
>> +			(1 << M_FIFO_TX_FLUSH_SHIFT);
>> +		writel(val, dev->base + M_FIFO_CTRL_OFFSET);
>> +		return -EREMOTEIO;
>> +	}
>> +
>> +	ret = bcm_iproc_i2c_check_status(dev);
>> +	if (ret) {
>> +		/* flush both TX/RX FIFOs */
>> +		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
>> +			(1 << M_FIFO_TX_FLUSH_SHIFT);
>> +		writel(val, dev->base + M_FIFO_CTRL_OFFSET);
>> +		return ret;
>> +	}
>> +
>> +	/*
>> +	 * For a read operation, we now need to load the data from FIFO
>> +	 * into the memory buffer
>> +	 */
>> +	if (msg->flags & I2C_M_RD) {
>> +		for (i = 0; i < msg->len; i++) {
>> +			msg->buf[i] = (readl(dev->base + M_RX_OFFSET) >>
>> +					M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
>> +		}
>> +	}
>> +
>> +	dev_dbg(dev->device, "xfer %c, addr=0x%02x, len=%d\n",
>> +			(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
>> +			msg->len);
>> +	dev_dbg(dev->device, "**** data start ****\n");
>> +	for (i = 0; i < msg->len; i++)
>> +		dev_dbg(dev->device, "0x%02x ",  msg->buf[i]);
>> +	dev_dbg(dev->device, "**** data end ****\n");
>> +
>> +	return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
>> +			      struct i2c_msg msgs[], int num)
>> +{
>> +	struct bcm_iproc_i2c_dev *dev = i2c_get_adapdata(adapter);
>> +	int ret, i;
>> +
>> +	/* go through all messages */
>> +	for (i = 0; i < num; i++) {
>> +		ret = bcm_iproc_i2c_xfer_single_msg(dev, &msgs[i]);
>> +		if (ret) {
>> +			dev_err(dev->device, "xfer failed\n");
>> +			return ret;
>> +		}
>> +	}
>> +
>> +	return num;
>> +}
>> +
>> +static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
>> +{
>> +	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
>> +}
>> +
>> +static const struct i2c_algorithm bcm_iproc_algo = {
>> +	.master_xfer = bcm_iproc_i2c_xfer,
>> +	.functionality = bcm_iproc_i2c_functionality,
>> +};
>> +
>> +static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +	unsigned int bus_speed, speed_bit;
>> +	u32 val;
>> +	int ret = of_property_read_u32(dev->device->of_node, "clock-frequency",
>> +				       &bus_speed);
> Inconsistent coding style. At most other places you use 2 tabs to indent
> a continued line. (Well you use this style for breaks in function
> declarations. Using the same style for both cases would be nice.)
> 
Will try to use this style for both continued lines and function
declarations. Thanks!

>> +	if (ret < 0) {
>> +		dev_err(dev->device, "missing clock-frequency property\n");
>> +		return -ENODEV;
>> +	}
>> +
>> +	switch (bus_speed) {
>> +	case 100000:
>> +		speed_bit = 0;
>> +		break;
>> +	case 400000:
>> +		speed_bit = 1;
>> +		break;
>> +	default:
>> +		dev_err(dev->device, "%d Hz bus speed not supported\n",
>> +				bus_speed);
>> +		dev_err(dev->device, "valid speeds are 100khz and 400khz\n");
>> +		return -EINVAL;
>> +	}
> I'd be more graceful here:
> 
> 	if (bus_speed < 100000)
> 		error_out;
> 	else if (bus_speed < 400000)
> 		speed_bit = 0;
> 	else
> 		/* >= 400000 */
> 		speed_bit = 1;
> 
Okay I can do that. Thanks.

>> +
>> +	val = readl(dev->base + TIM_CFG_OFFSET);
>> +	val &= ~(1 << TIME_CFG_MODE_400_SHIFT);
>> +	val |= speed_bit << TIME_CFG_MODE_400_SHIFT;
>> +	writel(val, dev->base + TIM_CFG_OFFSET);
>> +
>> +	dev_info(dev->device, "bus set to %u Hz\n", bus_speed);
>> +
>> +	return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +	u32 val;
>> +
>> +	/* put controller in reset */
>> +	val = readl(dev->base + CFG_OFFSET);
>> +	val |= 1 << CFG_RESET_SHIFT;
>> +	val &= ~(1 << CFG_EN_SHIFT);
>> +	writel(val, dev->base + CFG_OFFSET);
>> +
>> +	/* wait 100 usec per spec */
>> +	udelay(100);
>> +
>> +	/* bring controller out of reset */
>> +	val = readl(dev->base + CFG_OFFSET);
> Is it necessary to reread the register value here?
> 
I guess not, since there's no one else modifies this register. Will get
rid of the redundant read here. Thanks!

>> +	val &= ~(1 << CFG_RESET_SHIFT);
>> +	writel(val, dev->base + CFG_OFFSET);
>> +
>> +	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
>> +	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
>> +	writel(val, dev->base + M_FIFO_CTRL_OFFSET);
>> +
>> +	/* disable all interrupts */
>> +	val = 0;
>> +	writel(val, dev->base + IE_OFFSET);
> writel(0, dev->base + IE_OFFSET);
> 
Right.

>> +	/* clear all pending interrupts */
>> +	val = readl(dev->base + IS_OFFSET);
>> +	writel(val, dev->base + IS_OFFSET);
> writel(0xffffffff, dev->base + IS_OFFSET); ??
> 
Yes, better.

>> +
>> +	return 0;
>> +}
>> +
>> +static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +	u32 val;
>> +
>> +	val = readl(dev->base + CFG_OFFSET);
>> +	val |= 1 << CFG_EN_SHIFT;
>> +	writel(val, dev->base + CFG_OFFSET);
>> +}
>> +
>> +static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +	u32 val;
>> +
>> +	val = readl(dev->base + CFG_OFFSET);
>> +	val &= ~(1 << CFG_EN_SHIFT);
>> +	writel(val, dev->base + CFG_OFFSET);
>> +}
>> +
>> +static int bcm_iproc_i2c_probe(struct platform_device *pdev)
>> +{
>> +	int irq, ret = 0;
>> +	struct bcm_iproc_i2c_dev *dev;
> "dev" is a misleading name here. I'd call this
> 
> 	bcm_iproc_i2c_ddata *ddata;
> 
I will change it to iproc_i2c;

>> +	struct i2c_adapter *adap;
>> +	struct resource *res;
>> +
>> +	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
>> +	if (!dev)
>> +		return -ENOMEM;
>> +
>> +	platform_set_drvdata(pdev, dev);
>> +	dev->device = &pdev->dev;
>> +	init_completion(&dev->done);
>> +
>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +	dev->base = devm_ioremap_resource(dev->device, res);
>> +	if (IS_ERR(dev->base))
>> +		return -ENOMEM;
> 		return PTR_ERR(dev->base);
> 
Okay. Thanks.

>> +
>> +	ret = bcm_iproc_i2c_init(dev);
>> +	if (ret)
>> +		return ret;
>> +
>> +	ret = bcm_iproc_i2c_cfg_speed(dev);
>> +	if (ret)
>> +		return ret;
>> +
>> +	irq = platform_get_irq(pdev, 0);
>> +	if (irq < 0) {
> irq == 0 should be handled as error, too.
> 
Ah. I thought zero is a valid global interrupt number, and I see other
drivers checking against < 0 as well. Is my understanding incorrect?

>> +		dev_err(dev->device, "no irq resource\n");
>> +		return irq;
>> +	}
>> +
>> +	ret = devm_request_irq(&pdev->dev, irq, bcm_iproc_i2c_isr,
>> +			IRQF_SHARED, pdev->name, dev);
>> +	if (ret) {
>> +		dev_err(dev->device, "unable to request irq %i\n", irq);
>> +		return ret;
>> +	}
>> +
>> +	bcm_iproc_i2c_enable(dev);
>> +
>> +	adap = &dev->adapter;
>> +	i2c_set_adapdata(adap, dev);
>> +	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
>> +	adap->algo = &bcm_iproc_algo;
>> +	adap->dev.parent = &pdev->dev;
>> +	adap->dev.of_node = pdev->dev.of_node;
>> +
>> +	ret = i2c_add_adapter(adap);
>> +	if (ret) {
>> +		dev_err(dev->device, "failed to add adapter\n");
>> +		return ret;
>> +	}
>> +
>> +	dev_info(dev->device, "device registered successfully\n");
> This just clutters the boot log. Please remove.
> 
Okay.

>> +
>> +	return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
>> +{
>> +	struct bcm_iproc_i2c_dev *dev = platform_get_drvdata(pdev);
>> +
>> +	i2c_del_adapter(&dev->adapter);
>> +	bcm_iproc_i2c_disable(dev);
> I think you have a problem here if bcm_iproc_i2c_remove is called while
> an irq is still being serviced. I'm not sure how to prevent this
> properly for a shared interrupt.
> 
Can I grab i2c_lock_adapter to ensure the bus is locked (so there's no
outstanding transactions or IRQs by the time we remove the adapter)? But
I see no I2C bus driver does this in their remove function...

>> +
>> +	return 0;
>> +}
>> +
>> +static const struct of_device_id bcm_iproc_i2c_of_match[] = {
>> +	{.compatible = "brcm,iproc-i2c",},
>> +	{},
>> +};
>> +MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
>> +
>> +static struct platform_driver bcm_iproc_i2c_driver = {
>> +	.driver = {
>> +		   .name = "bcm-iproc-i2c",
>> +		   .of_match_table = bcm_iproc_i2c_of_match,
>> +		   },
> Inconsistent indention.
> 
Sorry. Will fix.

>> +	.probe = bcm_iproc_i2c_probe,
>> +	.remove = bcm_iproc_i2c_remove,
>> +};
>> +module_platform_driver(bcm_iproc_i2c_driver);
>> +
>> +MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
>> +MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
>> +MODULE_LICENSE("GPL v2");
> 

Re: [PATCH v3 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/13/2015 2:50 PM, Uwe Kleine-König wrote:
> Hello,
> 
> On Tue, Dec 09, 2014 at 07:57:11PM -0800, Ray Jui wrote:
>> Add initial support to the Broadcom iProc I2C controller found in the
>> iProc family of SoCs.
>>
>> The iProc I2C controller has separate internal TX and RX FIFOs, each has
>> a size of 64 bytes. The iProc I2C controller supports two bus speeds
>> including standard mode (100kHz) and fast mode (400kHz)
>>
>> Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>> Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>> ---
>>  drivers/i2c/busses/Kconfig         |   10 +
>>  drivers/i2c/busses/Makefile        |    1 +
>>  drivers/i2c/busses/i2c-bcm-iproc.c |  500 ++++++++++++++++++++++++++++++++++++
>>  3 files changed, 511 insertions(+)
>>  create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c
>>
>> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
>> index c1351d9..df21366 100644
>> --- a/drivers/i2c/busses/Kconfig
>> +++ b/drivers/i2c/busses/Kconfig
>> @@ -372,6 +372,16 @@ config I2C_BCM2835
>>  	  This support is also available as a module.  If so, the module
>>  	  will be called i2c-bcm2835.
>>  
>> +config I2C_BCM_IPROC
>> +	tristate "Broadcom iProc I2C controller"
>> +	depends on ARCH_BCM_IPROC
>> +	default y
> It would be nice to have the following here to improve compile coverage
> testing:
> 
> 	depends on ARCH_BCM_IPROC || COMPILE_TEST
> 	default ARCH_BCM_IPROC
> 
Sure will do!

>> +	help
>> +	  If you say yes to this option, support will be included for the
>> +	  Broadcom iProc I2C controller.
>> +
>> +	  If you don't know what to do here, say N.
>> +
>>  config I2C_BCM_KONA
>>  	tristate "BCM Kona I2C adapter"
>>  	depends on ARCH_BCM_MOBILE
>> diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
>> index 5e6c822..216e7be 100644
>> --- a/drivers/i2c/busses/Makefile
>> +++ b/drivers/i2c/busses/Makefile
>> @@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
>>  obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
>>  obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
>>  obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
>> +obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
>>  obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
>>  obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
>>  obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
>> diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
>> new file mode 100644
>> index 0000000..35ac497
>> --- /dev/null
>> +++ b/drivers/i2c/busses/i2c-bcm-iproc.c
>> @@ -0,0 +1,500 @@
>> +/*
>> + * Copyright (C) 2014 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#include <linux/device.h>
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/sched.h>
>> +#include <linux/i2c.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/clk.h>
>> +#include <linux/io.h>
>> +#include <linux/slab.h>
>> +#include <linux/delay.h>
>> +
>> +#define CFG_OFFSET                   0x00
>> +#define CFG_RESET_SHIFT              31
>> +#define CFG_EN_SHIFT                 30
>> +#define CFG_M_RETRY_CNT_SHIFT        16
>> +#define CFG_M_RETRY_CNT_MASK         0x0f
>> +
>> +#define TIM_CFG_OFFSET               0x04
>> +#define TIME_CFG_MODE_400_SHIFT      31
>> +
>> +#define M_FIFO_CTRL_OFFSET           0x0c
>> +#define M_FIFO_RX_FLUSH_SHIFT        31
>> +#define M_FIFO_TX_FLUSH_SHIFT        30
>> +#define M_FIFO_RX_CNT_SHIFT          16
>> +#define M_FIFO_RX_CNT_MASK           0x7f
>> +#define M_FIFO_RX_THLD_SHIFT         8
>> +#define M_FIFO_RX_THLD_MASK          0x3f
>> +
>> +#define M_CMD_OFFSET                 0x30
>> +#define M_CMD_START_BUSY_SHIFT       31
>> +#define M_CMD_STATUS_SHIFT           25
>> +#define M_CMD_STATUS_MASK            0x07
>> +#define M_CMD_STATUS_SUCCESS         0x0
>> +#define M_CMD_STATUS_LOST_ARB        0x1
>> +#define M_CMD_STATUS_NACK_ADDR       0x2
>> +#define M_CMD_STATUS_NACK_DATA       0x3
>> +#define M_CMD_STATUS_TIMEOUT         0x4
>> +#define M_CMD_PROTOCOL_SHIFT         9
>> +#define M_CMD_PROTOCOL_MASK          0xf
>> +#define M_CMD_PROTOCOL_BLK_WR        0x7
>> +#define M_CMD_PROTOCOL_BLK_RD        0x8
>> +#define M_CMD_PEC_SHIFT              8
>> +#define M_CMD_RD_CNT_SHIFT           0
>> +#define M_CMD_RD_CNT_MASK            0xff
>> +
>> +#define IE_OFFSET                    0x38
>> +#define IE_M_RX_FIFO_FULL_SHIFT      31
>> +#define IE_M_RX_THLD_SHIFT           30
>> +#define IE_M_START_BUSY_SHIFT        28
>> +
>> +#define IS_OFFSET                    0x3c
>> +#define IS_M_RX_FIFO_FULL_SHIFT      31
>> +#define IS_M_RX_THLD_SHIFT           30
>> +#define IS_M_START_BUSY_SHIFT        28
>> +
>> +#define M_TX_OFFSET                  0x40
>> +#define M_TX_WR_STATUS_SHIFT         31
>> +#define M_TX_DATA_SHIFT              0
>> +#define M_TX_DATA_MASK               0xff
>> +
>> +#define M_RX_OFFSET                  0x44
>> +#define M_RX_STATUS_SHIFT            30
>> +#define M_RX_STATUS_MASK             0x03
>> +#define M_RX_PEC_ERR_SHIFT           29
>> +#define M_RX_DATA_SHIFT              0
>> +#define M_RX_DATA_MASK               0xff
>> +
>> +#define I2C_TIMEOUT_MESC             100
>> +#define M_TX_RX_FIFO_SIZE            64
>> +
>> +enum bus_speed_index {
>> +	I2C_SPD_100K = 0,
>> +	I2C_SPD_400K,
>> +};
>> +
>> +struct bcm_iproc_i2c_dev {
>> +	struct device *device;
>> +
>> +	void __iomem *base;
>> +	struct i2c_msg *msg;
>> +
>> +	struct i2c_adapter adapter;
>> +
>> +	struct completion done;
>> +};
>> +
>> +/*
>> + * Can be expanded in the future if more interrupt status bits are utilized
>> + */
>> +#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
>> +
>> +static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
>> +{
>> +	struct bcm_iproc_i2c_dev *dev = data;
>> +	u32 status = readl(dev->base + IS_OFFSET);
>> +
>> +	status &= ISR_MASK;
>> +
>> +	if (!status)
>> +		return IRQ_NONE;
>> +
>> +	writel(status, dev->base + IS_OFFSET);
>> +	complete_all(&dev->done);
>> +
>> +	return IRQ_HANDLED;
>> +}
>> +
>> +static int __wait_for_bus_idle(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +	unsigned long timeout = jiffies + msecs_to_jiffies(I2C_TIMEOUT_MESC);
>> +
>> +	while (readl(dev->base + M_CMD_OFFSET) &
>> +			(1 << M_CMD_START_BUSY_SHIFT)) {
>> +		if (time_after(jiffies, timeout)) {
>> +			dev_err(dev->device, "wait for bus idle timeout\n");
>> +			return -ETIMEDOUT;
>> +		}
> Add a call to cpu_relax here. Do you really need a tight loop here?
> 
Yes, thanks!

>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *dev,
>> +				     struct i2c_msg *msg, u8 *addr)
>> +{
>> +
>> +	if (msg->flags & I2C_M_TEN) {
>> +		dev_err(dev->device, "no support for 10-bit address\n");
>> +		return -EINVAL;
>> +	}
>> +
>> +	*addr = (msg->addr << 1) & 0xfe;
> I don't see what difference the & 0xfe makes. I think you can drop that.
> 
Yeah just see this now. Thanks!

>> +
>> +	if (msg->flags & I2C_M_RD)
>> +		*addr |= 1;
>> +
>> +	return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +	u32 val;
>> +
>> +	val = readl(dev->base + M_CMD_OFFSET);
>> +	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
>> +
>> +	switch (val) {
>> +	case M_CMD_STATUS_SUCCESS:
>> +		return 0;
>> +
>> +	case M_CMD_STATUS_LOST_ARB:
>> +		dev_err(dev->device, "lost bus arbitration\n");
> I wouldn't dev_err that, only dev_dbg. I'm not sure how usual the errors
> for the next two cases is, maybe degrade them to dev_dbg, too?
> 
These errors are rare, and it's nice to keep them at the dev_err level
so the user will be more aware.

>> +		return -EREMOTEIO;
>> +
>> +	case M_CMD_STATUS_NACK_ADDR:
>> +		dev_err(dev->device, "NAK addr:0x%02x\n", dev->msg->addr);
>> +		return -EREMOTEIO;
>> +
>> +	case M_CMD_STATUS_NACK_DATA:
>> +		dev_err(dev->device, "NAK data\n");
>> +		return -EREMOTEIO;
>> +
>> +	case M_CMD_STATUS_TIMEOUT:
>> +		dev_err(dev->device, "bus timeout\n");
>> +		return -ETIMEDOUT;
>> +
>> +	default:
>> +		dev_err(dev->device, "unknown error code=%d\n", val);
>> +		return -EREMOTEIO;
>> +	}
>> +
>> +	return -EREMOTEIO;
>> +}
>> +
>> +static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *dev,
>> +					 struct i2c_msg *msg)
>> +{
>> +	int ret, i;
>> +	u8 addr;
>> +	u32 val;
>> +	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
>> +
>> +	if (msg->len < 1 || msg->len > M_TX_RX_FIFO_SIZE - 1) {
>> +		dev_err(dev->device,
>> +			"supported data length is 1 - %u bytes\n",
>> +				M_TX_RX_FIFO_SIZE - 1);
>> +		return -EINVAL;
>> +	}
>> +
>> +	dev->msg = msg;
>> +	ret = __wait_for_bus_idle(dev);
>> +	if (ret)
>> +		return ret;
>> +
>> +	ret = bcm_iproc_i2c_format_addr(dev, msg, &addr);
>> +	if (ret)
>> +		return ret;
>> +
>> +	/* load slave address into the TX FIFO */
>> +	writel(addr, dev->base + M_TX_OFFSET);
>> +
>> +	/* for a write transaction, load data into the TX FIFO */
>> +	if (!(msg->flags & I2C_M_RD)) {
>> +		for (i = 0; i < msg->len; i++) {
>> +			val = msg->buf[i];
>> +
>> +			/* mark the last byte */
>> +			if (i == msg->len - 1)
>> +				val |= 1 << M_TX_WR_STATUS_SHIFT;
>> +
>> +			writel(val, dev->base + M_TX_OFFSET);
>> +		}
>> +	}
>> +
>> +	/* mark as incomplete before starting the transaction */
>> +	reinit_completion(&dev->done);
>> +
>> +	/*
>> +	 * Enable the "start busy" interrupt, which will be triggered after
>> +	 * the transaction is done
> This sound's wrong. I'd expect "start busy" to trigger as soon as the
> controller gets hold of the bus.
> 
Okay maybe the naming is misleading. But this is the real name used in
the register description from the datasheet. I'll add more comment in
the code to make it more clear.

Basically this enables the interrupt that triggers when the controller
internal start_busy bit transitions from 1 to 0, i.e., after a
transaction finishes. The interrupt won't be triggered when a new
transaction starts since it causes the start_busy bit to transit from 0
to 1.

>> +	 */
>> +	writel(1 << IE_M_START_BUSY_SHIFT, dev->base + IE_OFFSET);
>> +
>> +	/*
>> +	 * Now we can activate the transfer. For a read operation, specify the
>> +	 * number of bytes to read
>> +	 */
>> +	val = 1 << M_CMD_START_BUSY_SHIFT;
>> +	if (msg->flags & I2C_M_RD) {
>> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
>> +			(msg->len << M_CMD_RD_CNT_SHIFT);
>> +	} else {
>> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
>> +	}
>> +	writel(val, dev->base + M_CMD_OFFSET);
>> +
>> +	time_left = wait_for_completion_timeout(&dev->done, time_left);
>> +
>> +	/* disable all interrupts */
>> +	writel(0, dev->base + IE_OFFSET);
>> +
>> +	if (!time_left) {
>> +		dev_err(dev->device, "transaction times out\n");
>> +
>> +		/* flush FIFOs */
>> +		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
>> +			(1 << M_FIFO_TX_FLUSH_SHIFT);
>> +		writel(val, dev->base + M_FIFO_CTRL_OFFSET);
>> +		return -EREMOTEIO;
>> +	}
>> +
>> +	ret = bcm_iproc_i2c_check_status(dev);
>> +	if (ret) {
>> +		/* flush both TX/RX FIFOs */
>> +		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
>> +			(1 << M_FIFO_TX_FLUSH_SHIFT);
>> +		writel(val, dev->base + M_FIFO_CTRL_OFFSET);
>> +		return ret;
>> +	}
>> +
>> +	/*
>> +	 * For a read operation, we now need to load the data from FIFO
>> +	 * into the memory buffer
>> +	 */
>> +	if (msg->flags & I2C_M_RD) {
>> +		for (i = 0; i < msg->len; i++) {
>> +			msg->buf[i] = (readl(dev->base + M_RX_OFFSET) >>
>> +					M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
>> +		}
>> +	}
>> +
>> +	dev_dbg(dev->device, "xfer %c, addr=0x%02x, len=%d\n",
>> +			(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
>> +			msg->len);
>> +	dev_dbg(dev->device, "**** data start ****\n");
>> +	for (i = 0; i < msg->len; i++)
>> +		dev_dbg(dev->device, "0x%02x ",  msg->buf[i]);
>> +	dev_dbg(dev->device, "**** data end ****\n");
>> +
>> +	return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
>> +			      struct i2c_msg msgs[], int num)
>> +{
>> +	struct bcm_iproc_i2c_dev *dev = i2c_get_adapdata(adapter);
>> +	int ret, i;
>> +
>> +	/* go through all messages */
>> +	for (i = 0; i < num; i++) {
>> +		ret = bcm_iproc_i2c_xfer_single_msg(dev, &msgs[i]);
>> +		if (ret) {
>> +			dev_err(dev->device, "xfer failed\n");
>> +			return ret;
>> +		}
>> +	}
>> +
>> +	return num;
>> +}
>> +
>> +static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
>> +{
>> +	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
>> +}
>> +
>> +static const struct i2c_algorithm bcm_iproc_algo = {
>> +	.master_xfer = bcm_iproc_i2c_xfer,
>> +	.functionality = bcm_iproc_i2c_functionality,
>> +};
>> +
>> +static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +	unsigned int bus_speed, speed_bit;
>> +	u32 val;
>> +	int ret = of_property_read_u32(dev->device->of_node, "clock-frequency",
>> +				       &bus_speed);
> Inconsistent coding style. At most other places you use 2 tabs to indent
> a continued line. (Well you use this style for breaks in function
> declarations. Using the same style for both cases would be nice.)
> 
Will try to use this style for both continued lines and function
declarations. Thanks!

>> +	if (ret < 0) {
>> +		dev_err(dev->device, "missing clock-frequency property\n");
>> +		return -ENODEV;
>> +	}
>> +
>> +	switch (bus_speed) {
>> +	case 100000:
>> +		speed_bit = 0;
>> +		break;
>> +	case 400000:
>> +		speed_bit = 1;
>> +		break;
>> +	default:
>> +		dev_err(dev->device, "%d Hz bus speed not supported\n",
>> +				bus_speed);
>> +		dev_err(dev->device, "valid speeds are 100khz and 400khz\n");
>> +		return -EINVAL;
>> +	}
> I'd be more graceful here:
> 
> 	if (bus_speed < 100000)
> 		error_out;
> 	else if (bus_speed < 400000)
> 		speed_bit = 0;
> 	else
> 		/* >= 400000 */
> 		speed_bit = 1;
> 
Okay I can do that. Thanks.

>> +
>> +	val = readl(dev->base + TIM_CFG_OFFSET);
>> +	val &= ~(1 << TIME_CFG_MODE_400_SHIFT);
>> +	val |= speed_bit << TIME_CFG_MODE_400_SHIFT;
>> +	writel(val, dev->base + TIM_CFG_OFFSET);
>> +
>> +	dev_info(dev->device, "bus set to %u Hz\n", bus_speed);
>> +
>> +	return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +	u32 val;
>> +
>> +	/* put controller in reset */
>> +	val = readl(dev->base + CFG_OFFSET);
>> +	val |= 1 << CFG_RESET_SHIFT;
>> +	val &= ~(1 << CFG_EN_SHIFT);
>> +	writel(val, dev->base + CFG_OFFSET);
>> +
>> +	/* wait 100 usec per spec */
>> +	udelay(100);
>> +
>> +	/* bring controller out of reset */
>> +	val = readl(dev->base + CFG_OFFSET);
> Is it necessary to reread the register value here?
> 
I guess not, since there's no one else modifies this register. Will get
rid of the redundant read here. Thanks!

>> +	val &= ~(1 << CFG_RESET_SHIFT);
>> +	writel(val, dev->base + CFG_OFFSET);
>> +
>> +	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
>> +	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
>> +	writel(val, dev->base + M_FIFO_CTRL_OFFSET);
>> +
>> +	/* disable all interrupts */
>> +	val = 0;
>> +	writel(val, dev->base + IE_OFFSET);
> writel(0, dev->base + IE_OFFSET);
> 
Right.

>> +	/* clear all pending interrupts */
>> +	val = readl(dev->base + IS_OFFSET);
>> +	writel(val, dev->base + IS_OFFSET);
> writel(0xffffffff, dev->base + IS_OFFSET); ??
> 
Yes, better.

>> +
>> +	return 0;
>> +}
>> +
>> +static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +	u32 val;
>> +
>> +	val = readl(dev->base + CFG_OFFSET);
>> +	val |= 1 << CFG_EN_SHIFT;
>> +	writel(val, dev->base + CFG_OFFSET);
>> +}
>> +
>> +static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +	u32 val;
>> +
>> +	val = readl(dev->base + CFG_OFFSET);
>> +	val &= ~(1 << CFG_EN_SHIFT);
>> +	writel(val, dev->base + CFG_OFFSET);
>> +}
>> +
>> +static int bcm_iproc_i2c_probe(struct platform_device *pdev)
>> +{
>> +	int irq, ret = 0;
>> +	struct bcm_iproc_i2c_dev *dev;
> "dev" is a misleading name here. I'd call this
> 
> 	bcm_iproc_i2c_ddata *ddata;
> 
I will change it to iproc_i2c;

>> +	struct i2c_adapter *adap;
>> +	struct resource *res;
>> +
>> +	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
>> +	if (!dev)
>> +		return -ENOMEM;
>> +
>> +	platform_set_drvdata(pdev, dev);
>> +	dev->device = &pdev->dev;
>> +	init_completion(&dev->done);
>> +
>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +	dev->base = devm_ioremap_resource(dev->device, res);
>> +	if (IS_ERR(dev->base))
>> +		return -ENOMEM;
> 		return PTR_ERR(dev->base);
> 
Okay. Thanks.

>> +
>> +	ret = bcm_iproc_i2c_init(dev);
>> +	if (ret)
>> +		return ret;
>> +
>> +	ret = bcm_iproc_i2c_cfg_speed(dev);
>> +	if (ret)
>> +		return ret;
>> +
>> +	irq = platform_get_irq(pdev, 0);
>> +	if (irq < 0) {
> irq == 0 should be handled as error, too.
> 
Ah. I thought zero is a valid global interrupt number, and I see other
drivers checking against < 0 as well. Is my understanding incorrect?

>> +		dev_err(dev->device, "no irq resource\n");
>> +		return irq;
>> +	}
>> +
>> +	ret = devm_request_irq(&pdev->dev, irq, bcm_iproc_i2c_isr,
>> +			IRQF_SHARED, pdev->name, dev);
>> +	if (ret) {
>> +		dev_err(dev->device, "unable to request irq %i\n", irq);
>> +		return ret;
>> +	}
>> +
>> +	bcm_iproc_i2c_enable(dev);
>> +
>> +	adap = &dev->adapter;
>> +	i2c_set_adapdata(adap, dev);
>> +	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
>> +	adap->algo = &bcm_iproc_algo;
>> +	adap->dev.parent = &pdev->dev;
>> +	adap->dev.of_node = pdev->dev.of_node;
>> +
>> +	ret = i2c_add_adapter(adap);
>> +	if (ret) {
>> +		dev_err(dev->device, "failed to add adapter\n");
>> +		return ret;
>> +	}
>> +
>> +	dev_info(dev->device, "device registered successfully\n");
> This just clutters the boot log. Please remove.
> 
Okay.

>> +
>> +	return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
>> +{
>> +	struct bcm_iproc_i2c_dev *dev = platform_get_drvdata(pdev);
>> +
>> +	i2c_del_adapter(&dev->adapter);
>> +	bcm_iproc_i2c_disable(dev);
> I think you have a problem here if bcm_iproc_i2c_remove is called while
> an irq is still being serviced. I'm not sure how to prevent this
> properly for a shared interrupt.
> 
Can I grab i2c_lock_adapter to ensure the bus is locked (so there's no
outstanding transactions or IRQs by the time we remove the adapter)? But
I see no I2C bus driver does this in their remove function...

>> +
>> +	return 0;
>> +}
>> +
>> +static const struct of_device_id bcm_iproc_i2c_of_match[] = {
>> +	{.compatible = "brcm,iproc-i2c",},
>> +	{},
>> +};
>> +MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
>> +
>> +static struct platform_driver bcm_iproc_i2c_driver = {
>> +	.driver = {
>> +		   .name = "bcm-iproc-i2c",
>> +		   .of_match_table = bcm_iproc_i2c_of_match,
>> +		   },
> Inconsistent indention.
> 
Sorry. Will fix.

>> +	.probe = bcm_iproc_i2c_probe,
>> +	.remove = bcm_iproc_i2c_remove,
>> +};
>> +module_platform_driver(bcm_iproc_i2c_driver);
>> +
>> +MODULE_AUTHOR("Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>");
>> +MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
>> +MODULE_LICENSE("GPL v2");
> 

[PATCH v3 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/13/2015 2:50 PM, Uwe Kleine-K?nig wrote:
> Hello,
> 
> On Tue, Dec 09, 2014 at 07:57:11PM -0800, Ray Jui wrote:
>> Add initial support to the Broadcom iProc I2C controller found in the
>> iProc family of SoCs.
>>
>> The iProc I2C controller has separate internal TX and RX FIFOs, each has
>> a size of 64 bytes. The iProc I2C controller supports two bus speeds
>> including standard mode (100kHz) and fast mode (400kHz)
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>> ---
>>  drivers/i2c/busses/Kconfig         |   10 +
>>  drivers/i2c/busses/Makefile        |    1 +
>>  drivers/i2c/busses/i2c-bcm-iproc.c |  500 ++++++++++++++++++++++++++++++++++++
>>  3 files changed, 511 insertions(+)
>>  create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c
>>
>> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
>> index c1351d9..df21366 100644
>> --- a/drivers/i2c/busses/Kconfig
>> +++ b/drivers/i2c/busses/Kconfig
>> @@ -372,6 +372,16 @@ config I2C_BCM2835
>>  	  This support is also available as a module.  If so, the module
>>  	  will be called i2c-bcm2835.
>>  
>> +config I2C_BCM_IPROC
>> +	tristate "Broadcom iProc I2C controller"
>> +	depends on ARCH_BCM_IPROC
>> +	default y
> It would be nice to have the following here to improve compile coverage
> testing:
> 
> 	depends on ARCH_BCM_IPROC || COMPILE_TEST
> 	default ARCH_BCM_IPROC
> 
Sure will do!

>> +	help
>> +	  If you say yes to this option, support will be included for the
>> +	  Broadcom iProc I2C controller.
>> +
>> +	  If you don't know what to do here, say N.
>> +
>>  config I2C_BCM_KONA
>>  	tristate "BCM Kona I2C adapter"
>>  	depends on ARCH_BCM_MOBILE
>> diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
>> index 5e6c822..216e7be 100644
>> --- a/drivers/i2c/busses/Makefile
>> +++ b/drivers/i2c/busses/Makefile
>> @@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
>>  obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
>>  obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
>>  obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
>> +obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
>>  obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
>>  obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
>>  obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
>> diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
>> new file mode 100644
>> index 0000000..35ac497
>> --- /dev/null
>> +++ b/drivers/i2c/busses/i2c-bcm-iproc.c
>> @@ -0,0 +1,500 @@
>> +/*
>> + * Copyright (C) 2014 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#include <linux/device.h>
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/sched.h>
>> +#include <linux/i2c.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/clk.h>
>> +#include <linux/io.h>
>> +#include <linux/slab.h>
>> +#include <linux/delay.h>
>> +
>> +#define CFG_OFFSET                   0x00
>> +#define CFG_RESET_SHIFT              31
>> +#define CFG_EN_SHIFT                 30
>> +#define CFG_M_RETRY_CNT_SHIFT        16
>> +#define CFG_M_RETRY_CNT_MASK         0x0f
>> +
>> +#define TIM_CFG_OFFSET               0x04
>> +#define TIME_CFG_MODE_400_SHIFT      31
>> +
>> +#define M_FIFO_CTRL_OFFSET           0x0c
>> +#define M_FIFO_RX_FLUSH_SHIFT        31
>> +#define M_FIFO_TX_FLUSH_SHIFT        30
>> +#define M_FIFO_RX_CNT_SHIFT          16
>> +#define M_FIFO_RX_CNT_MASK           0x7f
>> +#define M_FIFO_RX_THLD_SHIFT         8
>> +#define M_FIFO_RX_THLD_MASK          0x3f
>> +
>> +#define M_CMD_OFFSET                 0x30
>> +#define M_CMD_START_BUSY_SHIFT       31
>> +#define M_CMD_STATUS_SHIFT           25
>> +#define M_CMD_STATUS_MASK            0x07
>> +#define M_CMD_STATUS_SUCCESS         0x0
>> +#define M_CMD_STATUS_LOST_ARB        0x1
>> +#define M_CMD_STATUS_NACK_ADDR       0x2
>> +#define M_CMD_STATUS_NACK_DATA       0x3
>> +#define M_CMD_STATUS_TIMEOUT         0x4
>> +#define M_CMD_PROTOCOL_SHIFT         9
>> +#define M_CMD_PROTOCOL_MASK          0xf
>> +#define M_CMD_PROTOCOL_BLK_WR        0x7
>> +#define M_CMD_PROTOCOL_BLK_RD        0x8
>> +#define M_CMD_PEC_SHIFT              8
>> +#define M_CMD_RD_CNT_SHIFT           0
>> +#define M_CMD_RD_CNT_MASK            0xff
>> +
>> +#define IE_OFFSET                    0x38
>> +#define IE_M_RX_FIFO_FULL_SHIFT      31
>> +#define IE_M_RX_THLD_SHIFT           30
>> +#define IE_M_START_BUSY_SHIFT        28
>> +
>> +#define IS_OFFSET                    0x3c
>> +#define IS_M_RX_FIFO_FULL_SHIFT      31
>> +#define IS_M_RX_THLD_SHIFT           30
>> +#define IS_M_START_BUSY_SHIFT        28
>> +
>> +#define M_TX_OFFSET                  0x40
>> +#define M_TX_WR_STATUS_SHIFT         31
>> +#define M_TX_DATA_SHIFT              0
>> +#define M_TX_DATA_MASK               0xff
>> +
>> +#define M_RX_OFFSET                  0x44
>> +#define M_RX_STATUS_SHIFT            30
>> +#define M_RX_STATUS_MASK             0x03
>> +#define M_RX_PEC_ERR_SHIFT           29
>> +#define M_RX_DATA_SHIFT              0
>> +#define M_RX_DATA_MASK               0xff
>> +
>> +#define I2C_TIMEOUT_MESC             100
>> +#define M_TX_RX_FIFO_SIZE            64
>> +
>> +enum bus_speed_index {
>> +	I2C_SPD_100K = 0,
>> +	I2C_SPD_400K,
>> +};
>> +
>> +struct bcm_iproc_i2c_dev {
>> +	struct device *device;
>> +
>> +	void __iomem *base;
>> +	struct i2c_msg *msg;
>> +
>> +	struct i2c_adapter adapter;
>> +
>> +	struct completion done;
>> +};
>> +
>> +/*
>> + * Can be expanded in the future if more interrupt status bits are utilized
>> + */
>> +#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
>> +
>> +static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
>> +{
>> +	struct bcm_iproc_i2c_dev *dev = data;
>> +	u32 status = readl(dev->base + IS_OFFSET);
>> +
>> +	status &= ISR_MASK;
>> +
>> +	if (!status)
>> +		return IRQ_NONE;
>> +
>> +	writel(status, dev->base + IS_OFFSET);
>> +	complete_all(&dev->done);
>> +
>> +	return IRQ_HANDLED;
>> +}
>> +
>> +static int __wait_for_bus_idle(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +	unsigned long timeout = jiffies + msecs_to_jiffies(I2C_TIMEOUT_MESC);
>> +
>> +	while (readl(dev->base + M_CMD_OFFSET) &
>> +			(1 << M_CMD_START_BUSY_SHIFT)) {
>> +		if (time_after(jiffies, timeout)) {
>> +			dev_err(dev->device, "wait for bus idle timeout\n");
>> +			return -ETIMEDOUT;
>> +		}
> Add a call to cpu_relax here. Do you really need a tight loop here?
> 
Yes, thanks!

>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *dev,
>> +				     struct i2c_msg *msg, u8 *addr)
>> +{
>> +
>> +	if (msg->flags & I2C_M_TEN) {
>> +		dev_err(dev->device, "no support for 10-bit address\n");
>> +		return -EINVAL;
>> +	}
>> +
>> +	*addr = (msg->addr << 1) & 0xfe;
> I don't see what difference the & 0xfe makes. I think you can drop that.
> 
Yeah just see this now. Thanks!

>> +
>> +	if (msg->flags & I2C_M_RD)
>> +		*addr |= 1;
>> +
>> +	return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +	u32 val;
>> +
>> +	val = readl(dev->base + M_CMD_OFFSET);
>> +	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
>> +
>> +	switch (val) {
>> +	case M_CMD_STATUS_SUCCESS:
>> +		return 0;
>> +
>> +	case M_CMD_STATUS_LOST_ARB:
>> +		dev_err(dev->device, "lost bus arbitration\n");
> I wouldn't dev_err that, only dev_dbg. I'm not sure how usual the errors
> for the next two cases is, maybe degrade them to dev_dbg, too?
> 
These errors are rare, and it's nice to keep them at the dev_err level
so the user will be more aware.

>> +		return -EREMOTEIO;
>> +
>> +	case M_CMD_STATUS_NACK_ADDR:
>> +		dev_err(dev->device, "NAK addr:0x%02x\n", dev->msg->addr);
>> +		return -EREMOTEIO;
>> +
>> +	case M_CMD_STATUS_NACK_DATA:
>> +		dev_err(dev->device, "NAK data\n");
>> +		return -EREMOTEIO;
>> +
>> +	case M_CMD_STATUS_TIMEOUT:
>> +		dev_err(dev->device, "bus timeout\n");
>> +		return -ETIMEDOUT;
>> +
>> +	default:
>> +		dev_err(dev->device, "unknown error code=%d\n", val);
>> +		return -EREMOTEIO;
>> +	}
>> +
>> +	return -EREMOTEIO;
>> +}
>> +
>> +static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *dev,
>> +					 struct i2c_msg *msg)
>> +{
>> +	int ret, i;
>> +	u8 addr;
>> +	u32 val;
>> +	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
>> +
>> +	if (msg->len < 1 || msg->len > M_TX_RX_FIFO_SIZE - 1) {
>> +		dev_err(dev->device,
>> +			"supported data length is 1 - %u bytes\n",
>> +				M_TX_RX_FIFO_SIZE - 1);
>> +		return -EINVAL;
>> +	}
>> +
>> +	dev->msg = msg;
>> +	ret = __wait_for_bus_idle(dev);
>> +	if (ret)
>> +		return ret;
>> +
>> +	ret = bcm_iproc_i2c_format_addr(dev, msg, &addr);
>> +	if (ret)
>> +		return ret;
>> +
>> +	/* load slave address into the TX FIFO */
>> +	writel(addr, dev->base + M_TX_OFFSET);
>> +
>> +	/* for a write transaction, load data into the TX FIFO */
>> +	if (!(msg->flags & I2C_M_RD)) {
>> +		for (i = 0; i < msg->len; i++) {
>> +			val = msg->buf[i];
>> +
>> +			/* mark the last byte */
>> +			if (i == msg->len - 1)
>> +				val |= 1 << M_TX_WR_STATUS_SHIFT;
>> +
>> +			writel(val, dev->base + M_TX_OFFSET);
>> +		}
>> +	}
>> +
>> +	/* mark as incomplete before starting the transaction */
>> +	reinit_completion(&dev->done);
>> +
>> +	/*
>> +	 * Enable the "start busy" interrupt, which will be triggered after
>> +	 * the transaction is done
> This sound's wrong. I'd expect "start busy" to trigger as soon as the
> controller gets hold of the bus.
> 
Okay maybe the naming is misleading. But this is the real name used in
the register description from the datasheet. I'll add more comment in
the code to make it more clear.

Basically this enables the interrupt that triggers when the controller
internal start_busy bit transitions from 1 to 0, i.e., after a
transaction finishes. The interrupt won't be triggered when a new
transaction starts since it causes the start_busy bit to transit from 0
to 1.

>> +	 */
>> +	writel(1 << IE_M_START_BUSY_SHIFT, dev->base + IE_OFFSET);
>> +
>> +	/*
>> +	 * Now we can activate the transfer. For a read operation, specify the
>> +	 * number of bytes to read
>> +	 */
>> +	val = 1 << M_CMD_START_BUSY_SHIFT;
>> +	if (msg->flags & I2C_M_RD) {
>> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
>> +			(msg->len << M_CMD_RD_CNT_SHIFT);
>> +	} else {
>> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
>> +	}
>> +	writel(val, dev->base + M_CMD_OFFSET);
>> +
>> +	time_left = wait_for_completion_timeout(&dev->done, time_left);
>> +
>> +	/* disable all interrupts */
>> +	writel(0, dev->base + IE_OFFSET);
>> +
>> +	if (!time_left) {
>> +		dev_err(dev->device, "transaction times out\n");
>> +
>> +		/* flush FIFOs */
>> +		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
>> +			(1 << M_FIFO_TX_FLUSH_SHIFT);
>> +		writel(val, dev->base + M_FIFO_CTRL_OFFSET);
>> +		return -EREMOTEIO;
>> +	}
>> +
>> +	ret = bcm_iproc_i2c_check_status(dev);
>> +	if (ret) {
>> +		/* flush both TX/RX FIFOs */
>> +		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
>> +			(1 << M_FIFO_TX_FLUSH_SHIFT);
>> +		writel(val, dev->base + M_FIFO_CTRL_OFFSET);
>> +		return ret;
>> +	}
>> +
>> +	/*
>> +	 * For a read operation, we now need to load the data from FIFO
>> +	 * into the memory buffer
>> +	 */
>> +	if (msg->flags & I2C_M_RD) {
>> +		for (i = 0; i < msg->len; i++) {
>> +			msg->buf[i] = (readl(dev->base + M_RX_OFFSET) >>
>> +					M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
>> +		}
>> +	}
>> +
>> +	dev_dbg(dev->device, "xfer %c, addr=0x%02x, len=%d\n",
>> +			(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
>> +			msg->len);
>> +	dev_dbg(dev->device, "**** data start ****\n");
>> +	for (i = 0; i < msg->len; i++)
>> +		dev_dbg(dev->device, "0x%02x ",  msg->buf[i]);
>> +	dev_dbg(dev->device, "**** data end ****\n");
>> +
>> +	return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
>> +			      struct i2c_msg msgs[], int num)
>> +{
>> +	struct bcm_iproc_i2c_dev *dev = i2c_get_adapdata(adapter);
>> +	int ret, i;
>> +
>> +	/* go through all messages */
>> +	for (i = 0; i < num; i++) {
>> +		ret = bcm_iproc_i2c_xfer_single_msg(dev, &msgs[i]);
>> +		if (ret) {
>> +			dev_err(dev->device, "xfer failed\n");
>> +			return ret;
>> +		}
>> +	}
>> +
>> +	return num;
>> +}
>> +
>> +static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
>> +{
>> +	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
>> +}
>> +
>> +static const struct i2c_algorithm bcm_iproc_algo = {
>> +	.master_xfer = bcm_iproc_i2c_xfer,
>> +	.functionality = bcm_iproc_i2c_functionality,
>> +};
>> +
>> +static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +	unsigned int bus_speed, speed_bit;
>> +	u32 val;
>> +	int ret = of_property_read_u32(dev->device->of_node, "clock-frequency",
>> +				       &bus_speed);
> Inconsistent coding style. At most other places you use 2 tabs to indent
> a continued line. (Well you use this style for breaks in function
> declarations. Using the same style for both cases would be nice.)
> 
Will try to use this style for both continued lines and function
declarations. Thanks!

>> +	if (ret < 0) {
>> +		dev_err(dev->device, "missing clock-frequency property\n");
>> +		return -ENODEV;
>> +	}
>> +
>> +	switch (bus_speed) {
>> +	case 100000:
>> +		speed_bit = 0;
>> +		break;
>> +	case 400000:
>> +		speed_bit = 1;
>> +		break;
>> +	default:
>> +		dev_err(dev->device, "%d Hz bus speed not supported\n",
>> +				bus_speed);
>> +		dev_err(dev->device, "valid speeds are 100khz and 400khz\n");
>> +		return -EINVAL;
>> +	}
> I'd be more graceful here:
> 
> 	if (bus_speed < 100000)
> 		error_out;
> 	else if (bus_speed < 400000)
> 		speed_bit = 0;
> 	else
> 		/* >= 400000 */
> 		speed_bit = 1;
> 
Okay I can do that. Thanks.

>> +
>> +	val = readl(dev->base + TIM_CFG_OFFSET);
>> +	val &= ~(1 << TIME_CFG_MODE_400_SHIFT);
>> +	val |= speed_bit << TIME_CFG_MODE_400_SHIFT;
>> +	writel(val, dev->base + TIM_CFG_OFFSET);
>> +
>> +	dev_info(dev->device, "bus set to %u Hz\n", bus_speed);
>> +
>> +	return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +	u32 val;
>> +
>> +	/* put controller in reset */
>> +	val = readl(dev->base + CFG_OFFSET);
>> +	val |= 1 << CFG_RESET_SHIFT;
>> +	val &= ~(1 << CFG_EN_SHIFT);
>> +	writel(val, dev->base + CFG_OFFSET);
>> +
>> +	/* wait 100 usec per spec */
>> +	udelay(100);
>> +
>> +	/* bring controller out of reset */
>> +	val = readl(dev->base + CFG_OFFSET);
> Is it necessary to reread the register value here?
> 
I guess not, since there's no one else modifies this register. Will get
rid of the redundant read here. Thanks!

>> +	val &= ~(1 << CFG_RESET_SHIFT);
>> +	writel(val, dev->base + CFG_OFFSET);
>> +
>> +	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
>> +	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
>> +	writel(val, dev->base + M_FIFO_CTRL_OFFSET);
>> +
>> +	/* disable all interrupts */
>> +	val = 0;
>> +	writel(val, dev->base + IE_OFFSET);
> writel(0, dev->base + IE_OFFSET);
> 
Right.

>> +	/* clear all pending interrupts */
>> +	val = readl(dev->base + IS_OFFSET);
>> +	writel(val, dev->base + IS_OFFSET);
> writel(0xffffffff, dev->base + IS_OFFSET); ??
> 
Yes, better.

>> +
>> +	return 0;
>> +}
>> +
>> +static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +	u32 val;
>> +
>> +	val = readl(dev->base + CFG_OFFSET);
>> +	val |= 1 << CFG_EN_SHIFT;
>> +	writel(val, dev->base + CFG_OFFSET);
>> +}
>> +
>> +static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *dev)
>> +{
>> +	u32 val;
>> +
>> +	val = readl(dev->base + CFG_OFFSET);
>> +	val &= ~(1 << CFG_EN_SHIFT);
>> +	writel(val, dev->base + CFG_OFFSET);
>> +}
>> +
>> +static int bcm_iproc_i2c_probe(struct platform_device *pdev)
>> +{
>> +	int irq, ret = 0;
>> +	struct bcm_iproc_i2c_dev *dev;
> "dev" is a misleading name here. I'd call this
> 
> 	bcm_iproc_i2c_ddata *ddata;
> 
I will change it to iproc_i2c;

>> +	struct i2c_adapter *adap;
>> +	struct resource *res;
>> +
>> +	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
>> +	if (!dev)
>> +		return -ENOMEM;
>> +
>> +	platform_set_drvdata(pdev, dev);
>> +	dev->device = &pdev->dev;
>> +	init_completion(&dev->done);
>> +
>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +	dev->base = devm_ioremap_resource(dev->device, res);
>> +	if (IS_ERR(dev->base))
>> +		return -ENOMEM;
> 		return PTR_ERR(dev->base);
> 
Okay. Thanks.

>> +
>> +	ret = bcm_iproc_i2c_init(dev);
>> +	if (ret)
>> +		return ret;
>> +
>> +	ret = bcm_iproc_i2c_cfg_speed(dev);
>> +	if (ret)
>> +		return ret;
>> +
>> +	irq = platform_get_irq(pdev, 0);
>> +	if (irq < 0) {
> irq == 0 should be handled as error, too.
> 
Ah. I thought zero is a valid global interrupt number, and I see other
drivers checking against < 0 as well. Is my understanding incorrect?

>> +		dev_err(dev->device, "no irq resource\n");
>> +		return irq;
>> +	}
>> +
>> +	ret = devm_request_irq(&pdev->dev, irq, bcm_iproc_i2c_isr,
>> +			IRQF_SHARED, pdev->name, dev);
>> +	if (ret) {
>> +		dev_err(dev->device, "unable to request irq %i\n", irq);
>> +		return ret;
>> +	}
>> +
>> +	bcm_iproc_i2c_enable(dev);
>> +
>> +	adap = &dev->adapter;
>> +	i2c_set_adapdata(adap, dev);
>> +	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
>> +	adap->algo = &bcm_iproc_algo;
>> +	adap->dev.parent = &pdev->dev;
>> +	adap->dev.of_node = pdev->dev.of_node;
>> +
>> +	ret = i2c_add_adapter(adap);
>> +	if (ret) {
>> +		dev_err(dev->device, "failed to add adapter\n");
>> +		return ret;
>> +	}
>> +
>> +	dev_info(dev->device, "device registered successfully\n");
> This just clutters the boot log. Please remove.
> 
Okay.

>> +
>> +	return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
>> +{
>> +	struct bcm_iproc_i2c_dev *dev = platform_get_drvdata(pdev);
>> +
>> +	i2c_del_adapter(&dev->adapter);
>> +	bcm_iproc_i2c_disable(dev);
> I think you have a problem here if bcm_iproc_i2c_remove is called while
> an irq is still being serviced. I'm not sure how to prevent this
> properly for a shared interrupt.
> 
Can I grab i2c_lock_adapter to ensure the bus is locked (so there's no
outstanding transactions or IRQs by the time we remove the adapter)? But
I see no I2C bus driver does this in their remove function...

>> +
>> +	return 0;
>> +}
>> +
>> +static const struct of_device_id bcm_iproc_i2c_of_match[] = {
>> +	{.compatible = "brcm,iproc-i2c",},
>> +	{},
>> +};
>> +MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
>> +
>> +static struct platform_driver bcm_iproc_i2c_driver = {
>> +	.driver = {
>> +		   .name = "bcm-iproc-i2c",
>> +		   .of_match_table = bcm_iproc_i2c_of_match,
>> +		   },
> Inconsistent indention.
> 
Sorry. Will fix.

>> +	.probe = bcm_iproc_i2c_probe,
>> +	.remove = bcm_iproc_i2c_remove,
>> +};
>> +module_platform_driver(bcm_iproc_i2c_driver);
>> +
>> +MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
>> +MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
>> +MODULE_LICENSE("GPL v2");
> 

Re: [PATCH v3 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Uwe Kleine-König]

Hello,

On Tue, Jan 13, 2015 at 06:14:17PM -0800, Ray Jui wrote:
> >> +	irq = platform_get_irq(pdev, 0);
> >> +	if (irq < 0) {
> > irq == 0 should be handled as error, too.
> > 
> Ah. I thought zero is a valid global interrupt number, and I see other
> drivers checking against < 0 as well. Is my understanding incorrect?
These are wrong, too. 0 should never be a valid interrupt number. There
are some exceptions but mostly for historic reasons. The right handling
is used for example in drivers/i2c/busses/i2c-efm32.c.

> >> +		dev_err(dev->device, "no irq resource\n");
> >> +		return irq;
> >> +	}
> [...]
> >> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
> >> +{
> >> +	struct bcm_iproc_i2c_dev *dev = platform_get_drvdata(pdev);
> >> +
> >> +	i2c_del_adapter(&dev->adapter);
> >> +	bcm_iproc_i2c_disable(dev);
> > I think you have a problem here if bcm_iproc_i2c_remove is called while
> > an irq is still being serviced. I'm not sure how to prevent this
> > properly for a shared interrupt.
> > 
> Can I grab i2c_lock_adapter to ensure the bus is locked (so there's no
> outstanding transactions or IRQs by the time we remove the adapter)? But
> I see no I2C bus driver does this in their remove function...
The problem I pointed out is the reason for some driver authors not to
use devm_request_irq. If you use plain request_irq and the matching
free_irq in the .remove callback you can be sure that the irq isn't
running any more as soon as free_irq returns.

BTW, if you use vim, you can add

	set cinoptions=(,:
	if has("autocmd")
		filetype plugin indent on
	endif

to your .vimrc. Then while typing vim does the indention right and
consistent, and with the = command you can reindent.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

[PATCH v3 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Uwe Kleine-König]

Hello,

On Tue, Jan 13, 2015 at 06:14:17PM -0800, Ray Jui wrote:
> >> +	irq = platform_get_irq(pdev, 0);
> >> +	if (irq < 0) {
> > irq == 0 should be handled as error, too.
> > 
> Ah. I thought zero is a valid global interrupt number, and I see other
> drivers checking against < 0 as well. Is my understanding incorrect?
These are wrong, too. 0 should never be a valid interrupt number. There
are some exceptions but mostly for historic reasons. The right handling
is used for example in drivers/i2c/busses/i2c-efm32.c.

> >> +		dev_err(dev->device, "no irq resource\n");
> >> +		return irq;
> >> +	}
> [...]
> >> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
> >> +{
> >> +	struct bcm_iproc_i2c_dev *dev = platform_get_drvdata(pdev);
> >> +
> >> +	i2c_del_adapter(&dev->adapter);
> >> +	bcm_iproc_i2c_disable(dev);
> > I think you have a problem here if bcm_iproc_i2c_remove is called while
> > an irq is still being serviced. I'm not sure how to prevent this
> > properly for a shared interrupt.
> > 
> Can I grab i2c_lock_adapter to ensure the bus is locked (so there's no
> outstanding transactions or IRQs by the time we remove the adapter)? But
> I see no I2C bus driver does this in their remove function...
The problem I pointed out is the reason for some driver authors not to
use devm_request_irq. If you use plain request_irq and the matching
free_irq in the .remove callback you can be sure that the irq isn't
running any more as soon as free_irq returns.

BTW, if you use vim, you can add

	set cinoptions=(,:
	if has("autocmd")
		filetype plugin indent on
	endif

to your .vimrc. Then while typing vim does the indention right and
consistent, and with the = command you can reindent.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-K?nig            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

Re: [PATCH v3 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/13/2015 11:51 PM, Uwe Kleine-König wrote:
> Hello,
> 
> On Tue, Jan 13, 2015 at 06:14:17PM -0800, Ray Jui wrote:
>>>> +	irq = platform_get_irq(pdev, 0);
>>>> +	if (irq < 0) {
>>> irq == 0 should be handled as error, too.
>>>
>> Ah. I thought zero is a valid global interrupt number, and I see other
>> drivers checking against < 0 as well. Is my understanding incorrect?
> These are wrong, too. 0 should never be a valid interrupt number. There
> are some exceptions but mostly for historic reasons. The right handling
> is used for example in drivers/i2c/busses/i2c-efm32.c.
> 
Okay. Will check against <= 0. Thanks.

>>>> +		dev_err(dev->device, "no irq resource\n");
>>>> +		return irq;
>>>> +	}
>> [...]
>>>> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
>>>> +{
>>>> +	struct bcm_iproc_i2c_dev *dev = platform_get_drvdata(pdev);
>>>> +
>>>> +	i2c_del_adapter(&dev->adapter);
>>>> +	bcm_iproc_i2c_disable(dev);
>>> I think you have a problem here if bcm_iproc_i2c_remove is called while
>>> an irq is still being serviced. I'm not sure how to prevent this
>>> properly for a shared interrupt.
>>>
>> Can I grab i2c_lock_adapter to ensure the bus is locked (so there's no
>> outstanding transactions or IRQs by the time we remove the adapter)? But
>> I see no I2C bus driver does this in their remove function...
> The problem I pointed out is the reason for some driver authors not to
> use devm_request_irq. If you use plain request_irq and the matching
> free_irq in the .remove callback you can be sure that the irq isn't
> running any more as soon as free_irq returns.
> 
Okay. Will change to use request_irq and make sure that it's freed in
the remove function. Also, the interrupt is dedicated to the I2C
controller, so I'll remove the IRQF_SHARED flag.

> BTW, if you use vim, you can add
> 
> 	set cinoptions=(,:
> 	if has("autocmd")
> 		filetype plugin indent on
> 	endif
> 
> to your .vimrc. Then while typing vim does the indention right and
> consistent, and with the = command you can reindent.
> 
Wow this is excellent! Just tried and it works perfectly. Thanks a lot!!!

> Best regards
> Uwe
> 

Re: [PATCH v3 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/13/2015 11:51 PM, Uwe Kleine-König wrote:
> Hello,
> 
> On Tue, Jan 13, 2015 at 06:14:17PM -0800, Ray Jui wrote:
>>>> +	irq = platform_get_irq(pdev, 0);
>>>> +	if (irq < 0) {
>>> irq == 0 should be handled as error, too.
>>>
>> Ah. I thought zero is a valid global interrupt number, and I see other
>> drivers checking against < 0 as well. Is my understanding incorrect?
> These are wrong, too. 0 should never be a valid interrupt number. There
> are some exceptions but mostly for historic reasons. The right handling
> is used for example in drivers/i2c/busses/i2c-efm32.c.
> 
Okay. Will check against <= 0. Thanks.

>>>> +		dev_err(dev->device, "no irq resource\n");
>>>> +		return irq;
>>>> +	}
>> [...]
>>>> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
>>>> +{
>>>> +	struct bcm_iproc_i2c_dev *dev = platform_get_drvdata(pdev);
>>>> +
>>>> +	i2c_del_adapter(&dev->adapter);
>>>> +	bcm_iproc_i2c_disable(dev);
>>> I think you have a problem here if bcm_iproc_i2c_remove is called while
>>> an irq is still being serviced. I'm not sure how to prevent this
>>> properly for a shared interrupt.
>>>
>> Can I grab i2c_lock_adapter to ensure the bus is locked (so there's no
>> outstanding transactions or IRQs by the time we remove the adapter)? But
>> I see no I2C bus driver does this in their remove function...
> The problem I pointed out is the reason for some driver authors not to
> use devm_request_irq. If you use plain request_irq and the matching
> free_irq in the .remove callback you can be sure that the irq isn't
> running any more as soon as free_irq returns.
> 
Okay. Will change to use request_irq and make sure that it's freed in
the remove function. Also, the interrupt is dedicated to the I2C
controller, so I'll remove the IRQF_SHARED flag.

> BTW, if you use vim, you can add
> 
> 	set cinoptions=(,:
> 	if has("autocmd")
> 		filetype plugin indent on
> 	endif
> 
> to your .vimrc. Then while typing vim does the indention right and
> consistent, and with the = command you can reindent.
> 
Wow this is excellent! Just tried and it works perfectly. Thanks a lot!!!

> Best regards
> Uwe
> 

[PATCH v3 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/13/2015 11:51 PM, Uwe Kleine-K?nig wrote:
> Hello,
> 
> On Tue, Jan 13, 2015 at 06:14:17PM -0800, Ray Jui wrote:
>>>> +	irq = platform_get_irq(pdev, 0);
>>>> +	if (irq < 0) {
>>> irq == 0 should be handled as error, too.
>>>
>> Ah. I thought zero is a valid global interrupt number, and I see other
>> drivers checking against < 0 as well. Is my understanding incorrect?
> These are wrong, too. 0 should never be a valid interrupt number. There
> are some exceptions but mostly for historic reasons. The right handling
> is used for example in drivers/i2c/busses/i2c-efm32.c.
> 
Okay. Will check against <= 0. Thanks.

>>>> +		dev_err(dev->device, "no irq resource\n");
>>>> +		return irq;
>>>> +	}
>> [...]
>>>> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
>>>> +{
>>>> +	struct bcm_iproc_i2c_dev *dev = platform_get_drvdata(pdev);
>>>> +
>>>> +	i2c_del_adapter(&dev->adapter);
>>>> +	bcm_iproc_i2c_disable(dev);
>>> I think you have a problem here if bcm_iproc_i2c_remove is called while
>>> an irq is still being serviced. I'm not sure how to prevent this
>>> properly for a shared interrupt.
>>>
>> Can I grab i2c_lock_adapter to ensure the bus is locked (so there's no
>> outstanding transactions or IRQs by the time we remove the adapter)? But
>> I see no I2C bus driver does this in their remove function...
> The problem I pointed out is the reason for some driver authors not to
> use devm_request_irq. If you use plain request_irq and the matching
> free_irq in the .remove callback you can be sure that the irq isn't
> running any more as soon as free_irq returns.
> 
Okay. Will change to use request_irq and make sure that it's freed in
the remove function. Also, the interrupt is dedicated to the I2C
controller, so I'll remove the IRQF_SHARED flag.

> BTW, if you use vim, you can add
> 
> 	set cinoptions=(,:
> 	if has("autocmd")
> 		filetype plugin indent on
> 	endif
> 
> to your .vimrc. Then while typing vim does the indention right and
> consistent, and with the = command you can reindent.
> 
Wow this is excellent! Just tried and it works perfectly. Thanks a lot!!!

> Best regards
> Uwe
> 

[PATCH v4 0/3] Add I2C support to Broadcom iProc

[Ray Jui]

This patchset contains the initial I2C support for Broadcom iProc family of
SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has a
size of 64 bytes. The iProc I2C controller supports two bus speeds including
standard mode (100 kHz) and fast mode (400 kHz)

Changes from v3:
 - Add config dependency to COMPILE_TEST to allow the driver to be build tested
   by other platforms
 - Improve CPU utilization efficiency in the loop of waiting for bus to idle
 - Add more comment in the driver to clarify the way how the "start busy"
   interrupt is triggered from the I2C controller
 - Fix inconsistent coding style and format
 - Improve the bus speed validation logic in the driver
 - Add code to free the interrupt line in driver's remove function. Also
   change to use non-devm API to request the interrupt line
 - Other miscellaneous improvements and fixes

Changes from v2:
 - Have the I2C driver default to y so it does not need to be selected from
   ARCH_BCM_IPROC. This also helps to get rid of one patch. The driver still
   depends on ARCH_BCM_IPROC
 - Get rid of redundant check on resource returned by platform_get_resource

Changes from v1:
 - Fix function argument parenthesis
 - Get rid of redundant driver owner field

Ray Jui (3):
  i2c: iProc: define Broadcom iProc I2C binding
  i2c: iproc: Add Broadcom iProc I2C Driver
  ARM: dts: add I2C device nodes for Broadcom Cygnus

 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   20 +
 drivers/i2c/busses/Kconfig                         |   10 +
 drivers/i2c/busses/Makefile                        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c                 |  503 ++++++++++++++++++++
 5 files changed, 571 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

-- 
1.7.9.5

[PATCH v4 0/3] Add I2C support to Broadcom iProc

[Ray Jui]

This patchset contains the initial I2C support for Broadcom iProc family of
SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has a
size of 64 bytes. The iProc I2C controller supports two bus speeds including
standard mode (100 kHz) and fast mode (400 kHz)

Changes from v3:
 - Add config dependency to COMPILE_TEST to allow the driver to be build tested
   by other platforms
 - Improve CPU utilization efficiency in the loop of waiting for bus to idle
 - Add more comment in the driver to clarify the way how the "start busy"
   interrupt is triggered from the I2C controller
 - Fix inconsistent coding style and format
 - Improve the bus speed validation logic in the driver
 - Add code to free the interrupt line in driver's remove function. Also
   change to use non-devm API to request the interrupt line
 - Other miscellaneous improvements and fixes

Changes from v2:
 - Have the I2C driver default to y so it does not need to be selected from
   ARCH_BCM_IPROC. This also helps to get rid of one patch. The driver still
   depends on ARCH_BCM_IPROC
 - Get rid of redundant check on resource returned by platform_get_resource

Changes from v1:
 - Fix function argument parenthesis
 - Get rid of redundant driver owner field

Ray Jui (3):
  i2c: iProc: define Broadcom iProc I2C binding
  i2c: iproc: Add Broadcom iProc I2C Driver
  ARM: dts: add I2C device nodes for Broadcom Cygnus

 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   20 +
 drivers/i2c/busses/Kconfig                         |   10 +
 drivers/i2c/busses/Makefile                        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c                 |  503 ++++++++++++++++++++
 5 files changed, 571 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

-- 
1.7.9.5

[PATCH v4 0/3] Add I2C support to Broadcom iProc

[Ray Jui]

This patchset contains the initial I2C support for Broadcom iProc family of
SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has a
size of 64 bytes. The iProc I2C controller supports two bus speeds including
standard mode (100 kHz) and fast mode (400 kHz)

Changes from v3:
 - Add config dependency to COMPILE_TEST to allow the driver to be build tested
   by other platforms
 - Improve CPU utilization efficiency in the loop of waiting for bus to idle
 - Add more comment in the driver to clarify the way how the "start busy"
   interrupt is triggered from the I2C controller
 - Fix inconsistent coding style and format
 - Improve the bus speed validation logic in the driver
 - Add code to free the interrupt line in driver's remove function. Also
   change to use non-devm API to request the interrupt line
 - Other miscellaneous improvements and fixes

Changes from v2:
 - Have the I2C driver default to y so it does not need to be selected from
   ARCH_BCM_IPROC. This also helps to get rid of one patch. The driver still
   depends on ARCH_BCM_IPROC
 - Get rid of redundant check on resource returned by platform_get_resource

Changes from v1:
 - Fix function argument parenthesis
 - Get rid of redundant driver owner field

Ray Jui (3):
  i2c: iProc: define Broadcom iProc I2C binding
  i2c: iproc: Add Broadcom iProc I2C Driver
  ARM: dts: add I2C device nodes for Broadcom Cygnus

 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   20 +
 drivers/i2c/busses/Kconfig                         |   10 +
 drivers/i2c/busses/Makefile                        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c                 |  503 ++++++++++++++++++++
 5 files changed, 571 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

-- 
1.7.9.5

[PATCH v4 1/3] i2c: iProc: define Broadcom iProc I2C binding

[Ray Jui]

Document the I2C device tree binding for Broadcom iProc family of
SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt

diff --git a/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
new file mode 100644
index 0000000..81f982c
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
@@ -0,0 +1,37 @@
+Broadcom iProc I2C controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,iproc-i2c"
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+    I2C controller registers
+
+- interrupts:
+    Should contain the I2C interrupt
+
+- clock-frequency:
+    This is the I2C bus clock. Need to be either 100000 or 400000
+
+- #address-cells:
+    Always 1 (for I2C addresses)
+
+- #size-cells:
+    Always 0
+
+Example:
+	i2c0: i2c@18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+
+		codec: wm8750@1a {
+			compatible = "wlf,wm8750";
+			reg = <0x1a>;
+		};
+	};
-- 
1.7.9.5

[PATCH v4 1/3] i2c: iProc: define Broadcom iProc I2C binding

[Ray Jui]

Document the I2C device tree binding for Broadcom iProc family of
SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt

diff --git a/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
new file mode 100644
index 0000000..81f982c
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
@@ -0,0 +1,37 @@
+Broadcom iProc I2C controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,iproc-i2c"
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+    I2C controller registers
+
+- interrupts:
+    Should contain the I2C interrupt
+
+- clock-frequency:
+    This is the I2C bus clock. Need to be either 100000 or 400000
+
+- #address-cells:
+    Always 1 (for I2C addresses)
+
+- #size-cells:
+    Always 0
+
+Example:
+	i2c0: i2c@18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+
+		codec: wm8750@1a {
+			compatible = "wlf,wm8750";
+			reg = <0x1a>;
+		};
+	};
-- 
1.7.9.5

[PATCH v4 1/3] i2c: iProc: define Broadcom iProc I2C binding

[Ray Jui]

Document the I2C device tree binding for Broadcom iProc family of
SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt

diff --git a/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
new file mode 100644
index 0000000..81f982c
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
@@ -0,0 +1,37 @@
+Broadcom iProc I2C controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,iproc-i2c"
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+    I2C controller registers
+
+- interrupts:
+    Should contain the I2C interrupt
+
+- clock-frequency:
+    This is the I2C bus clock. Need to be either 100000 or 400000
+
+- #address-cells:
+    Always 1 (for I2C addresses)
+
+- #size-cells:
+    Always 0
+
+Example:
+	i2c0: i2c at 18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+
+		codec: wm8750 at 1a {
+			compatible = "wlf,wm8750";
+			reg = <0x1a>;
+		};
+	};
-- 
1.7.9.5

[PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

Add initial support to the Broadcom iProc I2C controller found in the
iProc family of SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has
a size of 64 bytes. The iProc I2C controller supports two bus speeds
including standard mode (100kHz) and fast mode (400kHz)

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/i2c/busses/Kconfig         |   10 +
 drivers/i2c/busses/Makefile        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c |  503 ++++++++++++++++++++++++++++++++++++
 3 files changed, 514 insertions(+)
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 31e8308..af76d23 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -372,6 +372,16 @@ config I2C_BCM2835
 	  This support is also available as a module.  If so, the module
 	  will be called i2c-bcm2835.
 
+config I2C_BCM_IPROC
+	tristate "Broadcom iProc I2C controller"
+	depends on ARCH_BCM_IPROC || COMPILE_TEST
+	default ARCH_BCM_IPROC
+	help
+	  If you say yes to this option, support will be included for the
+	  Broadcom iProc I2C controller.
+
+	  If you don't know what to do here, say N.
+
 config I2C_BCM_KONA
 	tristate "BCM Kona I2C adapter"
 	depends on ARCH_BCM_MOBILE
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 56388f6..d93b509 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
 obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
 obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
 obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
+obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
 obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
 obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
 obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
new file mode 100644
index 0000000..7d9ed4e
--- /dev/null
+++ b/drivers/i2c/busses/i2c-bcm-iproc.c
@@ -0,0 +1,503 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+
+#define CFG_OFFSET                   0x00
+#define CFG_RESET_SHIFT              31
+#define CFG_EN_SHIFT                 30
+#define CFG_M_RETRY_CNT_SHIFT        16
+#define CFG_M_RETRY_CNT_MASK         0x0f
+
+#define TIM_CFG_OFFSET               0x04
+#define TIME_CFG_MODE_400_SHIFT      31
+
+#define M_FIFO_CTRL_OFFSET           0x0c
+#define M_FIFO_RX_FLUSH_SHIFT        31
+#define M_FIFO_TX_FLUSH_SHIFT        30
+#define M_FIFO_RX_CNT_SHIFT          16
+#define M_FIFO_RX_CNT_MASK           0x7f
+#define M_FIFO_RX_THLD_SHIFT         8
+#define M_FIFO_RX_THLD_MASK          0x3f
+
+#define M_CMD_OFFSET                 0x30
+#define M_CMD_START_BUSY_SHIFT       31
+#define M_CMD_STATUS_SHIFT           25
+#define M_CMD_STATUS_MASK            0x07
+#define M_CMD_STATUS_SUCCESS         0x0
+#define M_CMD_STATUS_LOST_ARB        0x1
+#define M_CMD_STATUS_NACK_ADDR       0x2
+#define M_CMD_STATUS_NACK_DATA       0x3
+#define M_CMD_STATUS_TIMEOUT         0x4
+#define M_CMD_PROTOCOL_SHIFT         9
+#define M_CMD_PROTOCOL_MASK          0xf
+#define M_CMD_PROTOCOL_BLK_WR        0x7
+#define M_CMD_PROTOCOL_BLK_RD        0x8
+#define M_CMD_PEC_SHIFT              8
+#define M_CMD_RD_CNT_SHIFT           0
+#define M_CMD_RD_CNT_MASK            0xff
+
+#define IE_OFFSET                    0x38
+#define IE_M_RX_FIFO_FULL_SHIFT      31
+#define IE_M_RX_THLD_SHIFT           30
+#define IE_M_START_BUSY_SHIFT        28
+
+#define IS_OFFSET                    0x3c
+#define IS_M_RX_FIFO_FULL_SHIFT      31
+#define IS_M_RX_THLD_SHIFT           30
+#define IS_M_START_BUSY_SHIFT        28
+
+#define M_TX_OFFSET                  0x40
+#define M_TX_WR_STATUS_SHIFT         31
+#define M_TX_DATA_SHIFT              0
+#define M_TX_DATA_MASK               0xff
+
+#define M_RX_OFFSET                  0x44
+#define M_RX_STATUS_SHIFT            30
+#define M_RX_STATUS_MASK             0x03
+#define M_RX_PEC_ERR_SHIFT           29
+#define M_RX_DATA_SHIFT              0
+#define M_RX_DATA_MASK               0xff
+
+#define I2C_TIMEOUT_MESC             100
+#define M_TX_RX_FIFO_SIZE            64
+
+enum bus_speed_index {
+	I2C_SPD_100K = 0,
+	I2C_SPD_400K,
+};
+
+struct bcm_iproc_i2c_dev {
+	struct device *device;
+	int irq;
+
+	void __iomem *base;
+	struct i2c_msg *msg;
+
+	struct i2c_adapter adapter;
+
+	struct completion done;
+};
+
+/*
+ * Can be expanded in the future if more interrupt status bits are utilized
+ */
+#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
+
+static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = data;
+	u32 status = readl(iproc_i2c->base + IS_OFFSET);
+
+	status &= ISR_MASK;
+
+	if (!status)
+		return IRQ_NONE;
+
+	writel(status, iproc_i2c->base + IS_OFFSET);
+	complete_all(&iproc_i2c->done);
+
+	return IRQ_HANDLED;
+}
+
+static int __wait_for_bus_idle(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	unsigned long timeout = jiffies + msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	while (readl(iproc_i2c->base + M_CMD_OFFSET) &
+	       (1 << M_CMD_START_BUSY_SHIFT)) {
+		if (time_after(jiffies, timeout)) {
+			dev_err(iproc_i2c->device,
+				"wait for bus idle timeout\n");
+			return -ETIMEDOUT;
+		}
+		cpu_relax();
+	}
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *iproc_i2c,
+				     struct i2c_msg *msg, u8 *addr)
+{
+
+	if (msg->flags & I2C_M_TEN) {
+		dev_err(iproc_i2c->device, "no support for 10-bit address\n");
+		return -EINVAL;
+	}
+
+	*addr = (msg->addr << 1);
+
+	if (msg->flags & I2C_M_RD)
+		*addr |= 1;
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + M_CMD_OFFSET);
+	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
+
+	switch (val) {
+	case M_CMD_STATUS_SUCCESS:
+		return 0;
+
+	case M_CMD_STATUS_LOST_ARB:
+		dev_err(iproc_i2c->device, "lost bus arbitration\n");
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_NACK_ADDR:
+		dev_err(iproc_i2c->device, "NAK addr:0x%02x\n",
+			iproc_i2c->msg->addr);
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_NACK_DATA:
+		dev_err(iproc_i2c->device, "NAK data\n");
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_TIMEOUT:
+		dev_err(iproc_i2c->device, "bus timeout\n");
+		return -ETIMEDOUT;
+
+	default:
+		dev_err(iproc_i2c->device, "unknown error code=%d\n", val);
+		return -EREMOTEIO;
+	}
+
+	return -EREMOTEIO;
+}
+
+static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *iproc_i2c,
+					 struct i2c_msg *msg)
+{
+	int ret, i;
+	u8 addr;
+	u32 val;
+	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	if (msg->len < 1 || msg->len > M_TX_RX_FIFO_SIZE - 1) {
+		dev_err(iproc_i2c->device,
+			"supported data length is 1 - %u bytes\n",
+			M_TX_RX_FIFO_SIZE - 1);
+		return -EINVAL;
+	}
+
+	iproc_i2c->msg = msg;
+	ret = __wait_for_bus_idle(iproc_i2c);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_format_addr(iproc_i2c, msg, &addr);
+	if (ret)
+		return ret;
+
+	/* load slave address into the TX FIFO */
+	writel(addr, iproc_i2c->base + M_TX_OFFSET);
+
+	/* for a write transaction, load data into the TX FIFO */
+	if (!(msg->flags & I2C_M_RD)) {
+		for (i = 0; i < msg->len; i++) {
+			val = msg->buf[i];
+
+			/* mark the last byte */
+			if (i == msg->len - 1)
+				val |= 1 << M_TX_WR_STATUS_SHIFT;
+
+			writel(val, iproc_i2c->base + M_TX_OFFSET);
+		}
+	}
+
+	/* mark as incomplete before starting the transaction */
+	reinit_completion(&iproc_i2c->done);
+
+	/*
+	 * Enable the "start busy" interrupt, which will be triggered after
+	 * the transaction is done, i.e., the internal start_busy bit
+	 * transitions from 1 to 0
+	 */
+	writel(1 << IE_M_START_BUSY_SHIFT, iproc_i2c->base + IE_OFFSET);
+
+	/*
+	 * Now we can activate the transfer. For a read operation, specify the
+	 * number of bytes to read
+	 */
+	val = 1 << M_CMD_START_BUSY_SHIFT;
+	if (msg->flags & I2C_M_RD) {
+		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
+		       (msg->len << M_CMD_RD_CNT_SHIFT);
+	} else {
+		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
+	}
+	writel(val, iproc_i2c->base + M_CMD_OFFSET);
+
+	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+
+	if (!time_left) {
+		dev_err(iproc_i2c->device, "transaction times out\n");
+
+		/* flush FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return -EREMOTEIO;
+	}
+
+	ret = bcm_iproc_i2c_check_status(iproc_i2c);
+	if (ret) {
+		/* flush both TX/RX FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return ret;
+	}
+
+	/*
+	 * For a read operation, we now need to load the data from FIFO
+	 * into the memory buffer
+	 */
+	if (msg->flags & I2C_M_RD) {
+		for (i = 0; i < msg->len; i++) {
+			msg->buf[i] = (readl(iproc_i2c->base + M_RX_OFFSET) >>
+				      M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
+		}
+	}
+
+	dev_dbg(iproc_i2c->device, "xfer %c, addr=0x%02x, len=%d\n",
+		(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
+		msg->len);
+	dev_dbg(iproc_i2c->device, "**** data start ****\n");
+	for (i = 0; i < msg->len; i++)
+		dev_dbg(iproc_i2c->device, "0x%02x ",  msg->buf[i]);
+	dev_dbg(iproc_i2c->device, "**** data end ****\n");
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
+			      struct i2c_msg msgs[], int num)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = i2c_get_adapdata(adapter);
+	int ret, i;
+
+	/* go through all messages */
+	for (i = 0; i < num; i++) {
+		ret = bcm_iproc_i2c_xfer_single_msg(iproc_i2c, &msgs[i]);
+		if (ret) {
+			dev_err(iproc_i2c->device, "xfer failed\n");
+			return ret;
+		}
+	}
+
+	return num;
+}
+
+static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm bcm_iproc_algo = {
+	.master_xfer = bcm_iproc_i2c_xfer,
+	.functionality = bcm_iproc_i2c_functionality,
+};
+
+static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	unsigned int bus_speed, speed_bit;
+	u32 val;
+	int ret = of_property_read_u32(iproc_i2c->device->of_node,
+				       "clock-frequency", &bus_speed);
+	if (ret < 0) {
+		dev_err(iproc_i2c->device,
+			"missing clock-frequency property\n");
+		return -ENODEV;
+	}
+
+	if (bus_speed < 100000) {
+		dev_err(iproc_i2c->device, "%d Hz bus speed not supported\n",
+			bus_speed);
+		dev_err(iproc_i2c->device,
+			"valid speeds are 100khz and 400khz\n");
+		return -EINVAL;
+	} else if (bus_speed < 400000) {
+		speed_bit = 0;
+	} else {
+		/* bus_speed >= 400000 */
+		speed_bit = 1;
+	}
+
+	val = readl(iproc_i2c->base + TIM_CFG_OFFSET);
+	val &= ~(1 << TIME_CFG_MODE_400_SHIFT);
+	val |= speed_bit << TIME_CFG_MODE_400_SHIFT;
+	writel(val, iproc_i2c->base + TIM_CFG_OFFSET);
+
+	dev_info(iproc_i2c->device, "bus set to %u Hz\n", bus_speed);
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	/* put controller in reset */
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val |= 1 << CFG_RESET_SHIFT;
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* wait 100 usec per spec */
+	udelay(100);
+
+	/* bring controller out of reset */
+	val &= ~(1 << CFG_RESET_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
+	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
+	writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+
+	/* clear all pending interrupts */
+	writel(0xffffffff, iproc_i2c->base + IS_OFFSET);
+
+	return 0;
+}
+
+static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val |= 1 << CFG_EN_SHIFT;
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+}
+
+static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+}
+
+static int bcm_iproc_i2c_probe(struct platform_device *pdev)
+{
+	int irq, ret = 0;
+	struct bcm_iproc_i2c_dev *iproc_i2c;
+	struct i2c_adapter *adap;
+	struct resource *res;
+
+	iproc_i2c = devm_kzalloc(&pdev->dev, sizeof(*iproc_i2c),
+				 GFP_KERNEL);
+	if (!iproc_i2c)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, iproc_i2c);
+	iproc_i2c->device = &pdev->dev;
+	init_completion(&iproc_i2c->done);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	iproc_i2c->base = devm_ioremap_resource(iproc_i2c->device, res);
+	if (IS_ERR(iproc_i2c->base))
+		return PTR_ERR(iproc_i2c->base);
+
+	ret = bcm_iproc_i2c_init(iproc_i2c);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_cfg_speed(iproc_i2c);
+	if (ret)
+		return ret;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq <= 0) {
+		dev_err(iproc_i2c->device, "no irq resource\n");
+		return irq;
+	}
+	iproc_i2c->irq = irq;
+
+	ret = request_irq(irq, bcm_iproc_i2c_isr, 0, pdev->name, iproc_i2c);
+	if (ret < 0) {
+		dev_err(iproc_i2c->device, "unable to request irq %i\n", irq);
+		return ret;
+	}
+
+	bcm_iproc_i2c_enable(iproc_i2c);
+
+	adap = &iproc_i2c->adapter;
+	i2c_set_adapdata(adap, iproc_i2c);
+	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
+	adap->algo = &bcm_iproc_algo;
+	adap->dev.parent = &pdev->dev;
+	adap->dev.of_node = pdev->dev.of_node;
+
+	ret = i2c_add_adapter(adap);
+	if (ret) {
+		dev_err(iproc_i2c->device, "failed to add adapter\n");
+		free_irq(iproc_i2c->irq, iproc_i2c);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_remove(struct platform_device *pdev)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
+
+	i2c_del_adapter(&iproc_i2c->adapter);
+	free_irq(iproc_i2c->irq, iproc_i2c);
+	bcm_iproc_i2c_disable(iproc_i2c);
+
+	return 0;
+}
+
+static const struct of_device_id bcm_iproc_i2c_of_match[] = {
+	{.compatible = "brcm,iproc-i2c",},
+	{},
+};
+MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
+
+static struct platform_driver bcm_iproc_i2c_driver = {
+	.driver = {
+		.name = "bcm-iproc-i2c",
+		.of_match_table = bcm_iproc_i2c_of_match,
+	},
+	.probe = bcm_iproc_i2c_probe,
+	.remove = bcm_iproc_i2c_remove,
+};
+module_platform_driver(bcm_iproc_i2c_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

Add initial support to the Broadcom iProc I2C controller found in the
iProc family of SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has
a size of 64 bytes. The iProc I2C controller supports two bus speeds
including standard mode (100kHz) and fast mode (400kHz)

Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
---
 drivers/i2c/busses/Kconfig         |   10 +
 drivers/i2c/busses/Makefile        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c |  503 ++++++++++++++++++++++++++++++++++++
 3 files changed, 514 insertions(+)
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 31e8308..af76d23 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -372,6 +372,16 @@ config I2C_BCM2835
 	  This support is also available as a module.  If so, the module
 	  will be called i2c-bcm2835.
 
+config I2C_BCM_IPROC
+	tristate "Broadcom iProc I2C controller"
+	depends on ARCH_BCM_IPROC || COMPILE_TEST
+	default ARCH_BCM_IPROC
+	help
+	  If you say yes to this option, support will be included for the
+	  Broadcom iProc I2C controller.
+
+	  If you don't know what to do here, say N.
+
 config I2C_BCM_KONA
 	tristate "BCM Kona I2C adapter"
 	depends on ARCH_BCM_MOBILE
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 56388f6..d93b509 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
 obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
 obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
 obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
+obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
 obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
 obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
 obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
new file mode 100644
index 0000000..7d9ed4e
--- /dev/null
+++ b/drivers/i2c/busses/i2c-bcm-iproc.c
@@ -0,0 +1,503 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+
+#define CFG_OFFSET                   0x00
+#define CFG_RESET_SHIFT              31
+#define CFG_EN_SHIFT                 30
+#define CFG_M_RETRY_CNT_SHIFT        16
+#define CFG_M_RETRY_CNT_MASK         0x0f
+
+#define TIM_CFG_OFFSET               0x04
+#define TIME_CFG_MODE_400_SHIFT      31
+
+#define M_FIFO_CTRL_OFFSET           0x0c
+#define M_FIFO_RX_FLUSH_SHIFT        31
+#define M_FIFO_TX_FLUSH_SHIFT        30
+#define M_FIFO_RX_CNT_SHIFT          16
+#define M_FIFO_RX_CNT_MASK           0x7f
+#define M_FIFO_RX_THLD_SHIFT         8
+#define M_FIFO_RX_THLD_MASK          0x3f
+
+#define M_CMD_OFFSET                 0x30
+#define M_CMD_START_BUSY_SHIFT       31
+#define M_CMD_STATUS_SHIFT           25
+#define M_CMD_STATUS_MASK            0x07
+#define M_CMD_STATUS_SUCCESS         0x0
+#define M_CMD_STATUS_LOST_ARB        0x1
+#define M_CMD_STATUS_NACK_ADDR       0x2
+#define M_CMD_STATUS_NACK_DATA       0x3
+#define M_CMD_STATUS_TIMEOUT         0x4
+#define M_CMD_PROTOCOL_SHIFT         9
+#define M_CMD_PROTOCOL_MASK          0xf
+#define M_CMD_PROTOCOL_BLK_WR        0x7
+#define M_CMD_PROTOCOL_BLK_RD        0x8
+#define M_CMD_PEC_SHIFT              8
+#define M_CMD_RD_CNT_SHIFT           0
+#define M_CMD_RD_CNT_MASK            0xff
+
+#define IE_OFFSET                    0x38
+#define IE_M_RX_FIFO_FULL_SHIFT      31
+#define IE_M_RX_THLD_SHIFT           30
+#define IE_M_START_BUSY_SHIFT        28
+
+#define IS_OFFSET                    0x3c
+#define IS_M_RX_FIFO_FULL_SHIFT      31
+#define IS_M_RX_THLD_SHIFT           30
+#define IS_M_START_BUSY_SHIFT        28
+
+#define M_TX_OFFSET                  0x40
+#define M_TX_WR_STATUS_SHIFT         31
+#define M_TX_DATA_SHIFT              0
+#define M_TX_DATA_MASK               0xff
+
+#define M_RX_OFFSET                  0x44
+#define M_RX_STATUS_SHIFT            30
+#define M_RX_STATUS_MASK             0x03
+#define M_RX_PEC_ERR_SHIFT           29
+#define M_RX_DATA_SHIFT              0
+#define M_RX_DATA_MASK               0xff
+
+#define I2C_TIMEOUT_MESC             100
+#define M_TX_RX_FIFO_SIZE            64
+
+enum bus_speed_index {
+	I2C_SPD_100K = 0,
+	I2C_SPD_400K,
+};
+
+struct bcm_iproc_i2c_dev {
+	struct device *device;
+	int irq;
+
+	void __iomem *base;
+	struct i2c_msg *msg;
+
+	struct i2c_adapter adapter;
+
+	struct completion done;
+};
+
+/*
+ * Can be expanded in the future if more interrupt status bits are utilized
+ */
+#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
+
+static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = data;
+	u32 status = readl(iproc_i2c->base + IS_OFFSET);
+
+	status &= ISR_MASK;
+
+	if (!status)
+		return IRQ_NONE;
+
+	writel(status, iproc_i2c->base + IS_OFFSET);
+	complete_all(&iproc_i2c->done);
+
+	return IRQ_HANDLED;
+}
+
+static int __wait_for_bus_idle(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	unsigned long timeout = jiffies + msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	while (readl(iproc_i2c->base + M_CMD_OFFSET) &
+	       (1 << M_CMD_START_BUSY_SHIFT)) {
+		if (time_after(jiffies, timeout)) {
+			dev_err(iproc_i2c->device,
+				"wait for bus idle timeout\n");
+			return -ETIMEDOUT;
+		}
+		cpu_relax();
+	}
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *iproc_i2c,
+				     struct i2c_msg *msg, u8 *addr)
+{
+
+	if (msg->flags & I2C_M_TEN) {
+		dev_err(iproc_i2c->device, "no support for 10-bit address\n");
+		return -EINVAL;
+	}
+
+	*addr = (msg->addr << 1);
+
+	if (msg->flags & I2C_M_RD)
+		*addr |= 1;
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + M_CMD_OFFSET);
+	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
+
+	switch (val) {
+	case M_CMD_STATUS_SUCCESS:
+		return 0;
+
+	case M_CMD_STATUS_LOST_ARB:
+		dev_err(iproc_i2c->device, "lost bus arbitration\n");
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_NACK_ADDR:
+		dev_err(iproc_i2c->device, "NAK addr:0x%02x\n",
+			iproc_i2c->msg->addr);
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_NACK_DATA:
+		dev_err(iproc_i2c->device, "NAK data\n");
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_TIMEOUT:
+		dev_err(iproc_i2c->device, "bus timeout\n");
+		return -ETIMEDOUT;
+
+	default:
+		dev_err(iproc_i2c->device, "unknown error code=%d\n", val);
+		return -EREMOTEIO;
+	}
+
+	return -EREMOTEIO;
+}
+
+static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *iproc_i2c,
+					 struct i2c_msg *msg)
+{
+	int ret, i;
+	u8 addr;
+	u32 val;
+	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	if (msg->len < 1 || msg->len > M_TX_RX_FIFO_SIZE - 1) {
+		dev_err(iproc_i2c->device,
+			"supported data length is 1 - %u bytes\n",
+			M_TX_RX_FIFO_SIZE - 1);
+		return -EINVAL;
+	}
+
+	iproc_i2c->msg = msg;
+	ret = __wait_for_bus_idle(iproc_i2c);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_format_addr(iproc_i2c, msg, &addr);
+	if (ret)
+		return ret;
+
+	/* load slave address into the TX FIFO */
+	writel(addr, iproc_i2c->base + M_TX_OFFSET);
+
+	/* for a write transaction, load data into the TX FIFO */
+	if (!(msg->flags & I2C_M_RD)) {
+		for (i = 0; i < msg->len; i++) {
+			val = msg->buf[i];
+
+			/* mark the last byte */
+			if (i == msg->len - 1)
+				val |= 1 << M_TX_WR_STATUS_SHIFT;
+
+			writel(val, iproc_i2c->base + M_TX_OFFSET);
+		}
+	}
+
+	/* mark as incomplete before starting the transaction */
+	reinit_completion(&iproc_i2c->done);
+
+	/*
+	 * Enable the "start busy" interrupt, which will be triggered after
+	 * the transaction is done, i.e., the internal start_busy bit
+	 * transitions from 1 to 0
+	 */
+	writel(1 << IE_M_START_BUSY_SHIFT, iproc_i2c->base + IE_OFFSET);
+
+	/*
+	 * Now we can activate the transfer. For a read operation, specify the
+	 * number of bytes to read
+	 */
+	val = 1 << M_CMD_START_BUSY_SHIFT;
+	if (msg->flags & I2C_M_RD) {
+		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
+		       (msg->len << M_CMD_RD_CNT_SHIFT);
+	} else {
+		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
+	}
+	writel(val, iproc_i2c->base + M_CMD_OFFSET);
+
+	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+
+	if (!time_left) {
+		dev_err(iproc_i2c->device, "transaction times out\n");
+
+		/* flush FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return -EREMOTEIO;
+	}
+
+	ret = bcm_iproc_i2c_check_status(iproc_i2c);
+	if (ret) {
+		/* flush both TX/RX FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return ret;
+	}
+
+	/*
+	 * For a read operation, we now need to load the data from FIFO
+	 * into the memory buffer
+	 */
+	if (msg->flags & I2C_M_RD) {
+		for (i = 0; i < msg->len; i++) {
+			msg->buf[i] = (readl(iproc_i2c->base + M_RX_OFFSET) >>
+				      M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
+		}
+	}
+
+	dev_dbg(iproc_i2c->device, "xfer %c, addr=0x%02x, len=%d\n",
+		(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
+		msg->len);
+	dev_dbg(iproc_i2c->device, "**** data start ****\n");
+	for (i = 0; i < msg->len; i++)
+		dev_dbg(iproc_i2c->device, "0x%02x ",  msg->buf[i]);
+	dev_dbg(iproc_i2c->device, "**** data end ****\n");
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
+			      struct i2c_msg msgs[], int num)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = i2c_get_adapdata(adapter);
+	int ret, i;
+
+	/* go through all messages */
+	for (i = 0; i < num; i++) {
+		ret = bcm_iproc_i2c_xfer_single_msg(iproc_i2c, &msgs[i]);
+		if (ret) {
+			dev_err(iproc_i2c->device, "xfer failed\n");
+			return ret;
+		}
+	}
+
+	return num;
+}
+
+static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm bcm_iproc_algo = {
+	.master_xfer = bcm_iproc_i2c_xfer,
+	.functionality = bcm_iproc_i2c_functionality,
+};
+
+static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	unsigned int bus_speed, speed_bit;
+	u32 val;
+	int ret = of_property_read_u32(iproc_i2c->device->of_node,
+				       "clock-frequency", &bus_speed);
+	if (ret < 0) {
+		dev_err(iproc_i2c->device,
+			"missing clock-frequency property\n");
+		return -ENODEV;
+	}
+
+	if (bus_speed < 100000) {
+		dev_err(iproc_i2c->device, "%d Hz bus speed not supported\n",
+			bus_speed);
+		dev_err(iproc_i2c->device,
+			"valid speeds are 100khz and 400khz\n");
+		return -EINVAL;
+	} else if (bus_speed < 400000) {
+		speed_bit = 0;
+	} else {
+		/* bus_speed >= 400000 */
+		speed_bit = 1;
+	}
+
+	val = readl(iproc_i2c->base + TIM_CFG_OFFSET);
+	val &= ~(1 << TIME_CFG_MODE_400_SHIFT);
+	val |= speed_bit << TIME_CFG_MODE_400_SHIFT;
+	writel(val, iproc_i2c->base + TIM_CFG_OFFSET);
+
+	dev_info(iproc_i2c->device, "bus set to %u Hz\n", bus_speed);
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	/* put controller in reset */
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val |= 1 << CFG_RESET_SHIFT;
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* wait 100 usec per spec */
+	udelay(100);
+
+	/* bring controller out of reset */
+	val &= ~(1 << CFG_RESET_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
+	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
+	writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+
+	/* clear all pending interrupts */
+	writel(0xffffffff, iproc_i2c->base + IS_OFFSET);
+
+	return 0;
+}
+
+static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val |= 1 << CFG_EN_SHIFT;
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+}
+
+static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+}
+
+static int bcm_iproc_i2c_probe(struct platform_device *pdev)
+{
+	int irq, ret = 0;
+	struct bcm_iproc_i2c_dev *iproc_i2c;
+	struct i2c_adapter *adap;
+	struct resource *res;
+
+	iproc_i2c = devm_kzalloc(&pdev->dev, sizeof(*iproc_i2c),
+				 GFP_KERNEL);
+	if (!iproc_i2c)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, iproc_i2c);
+	iproc_i2c->device = &pdev->dev;
+	init_completion(&iproc_i2c->done);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	iproc_i2c->base = devm_ioremap_resource(iproc_i2c->device, res);
+	if (IS_ERR(iproc_i2c->base))
+		return PTR_ERR(iproc_i2c->base);
+
+	ret = bcm_iproc_i2c_init(iproc_i2c);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_cfg_speed(iproc_i2c);
+	if (ret)
+		return ret;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq <= 0) {
+		dev_err(iproc_i2c->device, "no irq resource\n");
+		return irq;
+	}
+	iproc_i2c->irq = irq;
+
+	ret = request_irq(irq, bcm_iproc_i2c_isr, 0, pdev->name, iproc_i2c);
+	if (ret < 0) {
+		dev_err(iproc_i2c->device, "unable to request irq %i\n", irq);
+		return ret;
+	}
+
+	bcm_iproc_i2c_enable(iproc_i2c);
+
+	adap = &iproc_i2c->adapter;
+	i2c_set_adapdata(adap, iproc_i2c);
+	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
+	adap->algo = &bcm_iproc_algo;
+	adap->dev.parent = &pdev->dev;
+	adap->dev.of_node = pdev->dev.of_node;
+
+	ret = i2c_add_adapter(adap);
+	if (ret) {
+		dev_err(iproc_i2c->device, "failed to add adapter\n");
+		free_irq(iproc_i2c->irq, iproc_i2c);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_remove(struct platform_device *pdev)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
+
+	i2c_del_adapter(&iproc_i2c->adapter);
+	free_irq(iproc_i2c->irq, iproc_i2c);
+	bcm_iproc_i2c_disable(iproc_i2c);
+
+	return 0;
+}
+
+static const struct of_device_id bcm_iproc_i2c_of_match[] = {
+	{.compatible = "brcm,iproc-i2c",},
+	{},
+};
+MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
+
+static struct platform_driver bcm_iproc_i2c_driver = {
+	.driver = {
+		.name = "bcm-iproc-i2c",
+		.of_match_table = bcm_iproc_i2c_of_match,
+	},
+	.probe = bcm_iproc_i2c_probe,
+	.remove = bcm_iproc_i2c_remove,
+};
+module_platform_driver(bcm_iproc_i2c_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>");
+MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

Add initial support to the Broadcom iProc I2C controller found in the
iProc family of SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has
a size of 64 bytes. The iProc I2C controller supports two bus speeds
including standard mode (100kHz) and fast mode (400kHz)

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/i2c/busses/Kconfig         |   10 +
 drivers/i2c/busses/Makefile        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c |  503 ++++++++++++++++++++++++++++++++++++
 3 files changed, 514 insertions(+)
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 31e8308..af76d23 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -372,6 +372,16 @@ config I2C_BCM2835
 	  This support is also available as a module.  If so, the module
 	  will be called i2c-bcm2835.
 
+config I2C_BCM_IPROC
+	tristate "Broadcom iProc I2C controller"
+	depends on ARCH_BCM_IPROC || COMPILE_TEST
+	default ARCH_BCM_IPROC
+	help
+	  If you say yes to this option, support will be included for the
+	  Broadcom iProc I2C controller.
+
+	  If you don't know what to do here, say N.
+
 config I2C_BCM_KONA
 	tristate "BCM Kona I2C adapter"
 	depends on ARCH_BCM_MOBILE
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 56388f6..d93b509 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
 obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
 obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
 obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
+obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
 obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
 obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
 obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
new file mode 100644
index 0000000..7d9ed4e
--- /dev/null
+++ b/drivers/i2c/busses/i2c-bcm-iproc.c
@@ -0,0 +1,503 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+
+#define CFG_OFFSET                   0x00
+#define CFG_RESET_SHIFT              31
+#define CFG_EN_SHIFT                 30
+#define CFG_M_RETRY_CNT_SHIFT        16
+#define CFG_M_RETRY_CNT_MASK         0x0f
+
+#define TIM_CFG_OFFSET               0x04
+#define TIME_CFG_MODE_400_SHIFT      31
+
+#define M_FIFO_CTRL_OFFSET           0x0c
+#define M_FIFO_RX_FLUSH_SHIFT        31
+#define M_FIFO_TX_FLUSH_SHIFT        30
+#define M_FIFO_RX_CNT_SHIFT          16
+#define M_FIFO_RX_CNT_MASK           0x7f
+#define M_FIFO_RX_THLD_SHIFT         8
+#define M_FIFO_RX_THLD_MASK          0x3f
+
+#define M_CMD_OFFSET                 0x30
+#define M_CMD_START_BUSY_SHIFT       31
+#define M_CMD_STATUS_SHIFT           25
+#define M_CMD_STATUS_MASK            0x07
+#define M_CMD_STATUS_SUCCESS         0x0
+#define M_CMD_STATUS_LOST_ARB        0x1
+#define M_CMD_STATUS_NACK_ADDR       0x2
+#define M_CMD_STATUS_NACK_DATA       0x3
+#define M_CMD_STATUS_TIMEOUT         0x4
+#define M_CMD_PROTOCOL_SHIFT         9
+#define M_CMD_PROTOCOL_MASK          0xf
+#define M_CMD_PROTOCOL_BLK_WR        0x7
+#define M_CMD_PROTOCOL_BLK_RD        0x8
+#define M_CMD_PEC_SHIFT              8
+#define M_CMD_RD_CNT_SHIFT           0
+#define M_CMD_RD_CNT_MASK            0xff
+
+#define IE_OFFSET                    0x38
+#define IE_M_RX_FIFO_FULL_SHIFT      31
+#define IE_M_RX_THLD_SHIFT           30
+#define IE_M_START_BUSY_SHIFT        28
+
+#define IS_OFFSET                    0x3c
+#define IS_M_RX_FIFO_FULL_SHIFT      31
+#define IS_M_RX_THLD_SHIFT           30
+#define IS_M_START_BUSY_SHIFT        28
+
+#define M_TX_OFFSET                  0x40
+#define M_TX_WR_STATUS_SHIFT         31
+#define M_TX_DATA_SHIFT              0
+#define M_TX_DATA_MASK               0xff
+
+#define M_RX_OFFSET                  0x44
+#define M_RX_STATUS_SHIFT            30
+#define M_RX_STATUS_MASK             0x03
+#define M_RX_PEC_ERR_SHIFT           29
+#define M_RX_DATA_SHIFT              0
+#define M_RX_DATA_MASK               0xff
+
+#define I2C_TIMEOUT_MESC             100
+#define M_TX_RX_FIFO_SIZE            64
+
+enum bus_speed_index {
+	I2C_SPD_100K = 0,
+	I2C_SPD_400K,
+};
+
+struct bcm_iproc_i2c_dev {
+	struct device *device;
+	int irq;
+
+	void __iomem *base;
+	struct i2c_msg *msg;
+
+	struct i2c_adapter adapter;
+
+	struct completion done;
+};
+
+/*
+ * Can be expanded in the future if more interrupt status bits are utilized
+ */
+#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
+
+static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = data;
+	u32 status = readl(iproc_i2c->base + IS_OFFSET);
+
+	status &= ISR_MASK;
+
+	if (!status)
+		return IRQ_NONE;
+
+	writel(status, iproc_i2c->base + IS_OFFSET);
+	complete_all(&iproc_i2c->done);
+
+	return IRQ_HANDLED;
+}
+
+static int __wait_for_bus_idle(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	unsigned long timeout = jiffies + msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	while (readl(iproc_i2c->base + M_CMD_OFFSET) &
+	       (1 << M_CMD_START_BUSY_SHIFT)) {
+		if (time_after(jiffies, timeout)) {
+			dev_err(iproc_i2c->device,
+				"wait for bus idle timeout\n");
+			return -ETIMEDOUT;
+		}
+		cpu_relax();
+	}
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *iproc_i2c,
+				     struct i2c_msg *msg, u8 *addr)
+{
+
+	if (msg->flags & I2C_M_TEN) {
+		dev_err(iproc_i2c->device, "no support for 10-bit address\n");
+		return -EINVAL;
+	}
+
+	*addr = (msg->addr << 1);
+
+	if (msg->flags & I2C_M_RD)
+		*addr |= 1;
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + M_CMD_OFFSET);
+	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
+
+	switch (val) {
+	case M_CMD_STATUS_SUCCESS:
+		return 0;
+
+	case M_CMD_STATUS_LOST_ARB:
+		dev_err(iproc_i2c->device, "lost bus arbitration\n");
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_NACK_ADDR:
+		dev_err(iproc_i2c->device, "NAK addr:0x%02x\n",
+			iproc_i2c->msg->addr);
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_NACK_DATA:
+		dev_err(iproc_i2c->device, "NAK data\n");
+		return -EREMOTEIO;
+
+	case M_CMD_STATUS_TIMEOUT:
+		dev_err(iproc_i2c->device, "bus timeout\n");
+		return -ETIMEDOUT;
+
+	default:
+		dev_err(iproc_i2c->device, "unknown error code=%d\n", val);
+		return -EREMOTEIO;
+	}
+
+	return -EREMOTEIO;
+}
+
+static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *iproc_i2c,
+					 struct i2c_msg *msg)
+{
+	int ret, i;
+	u8 addr;
+	u32 val;
+	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	if (msg->len < 1 || msg->len > M_TX_RX_FIFO_SIZE - 1) {
+		dev_err(iproc_i2c->device,
+			"supported data length is 1 - %u bytes\n",
+			M_TX_RX_FIFO_SIZE - 1);
+		return -EINVAL;
+	}
+
+	iproc_i2c->msg = msg;
+	ret = __wait_for_bus_idle(iproc_i2c);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_format_addr(iproc_i2c, msg, &addr);
+	if (ret)
+		return ret;
+
+	/* load slave address into the TX FIFO */
+	writel(addr, iproc_i2c->base + M_TX_OFFSET);
+
+	/* for a write transaction, load data into the TX FIFO */
+	if (!(msg->flags & I2C_M_RD)) {
+		for (i = 0; i < msg->len; i++) {
+			val = msg->buf[i];
+
+			/* mark the last byte */
+			if (i == msg->len - 1)
+				val |= 1 << M_TX_WR_STATUS_SHIFT;
+
+			writel(val, iproc_i2c->base + M_TX_OFFSET);
+		}
+	}
+
+	/* mark as incomplete before starting the transaction */
+	reinit_completion(&iproc_i2c->done);
+
+	/*
+	 * Enable the "start busy" interrupt, which will be triggered after
+	 * the transaction is done, i.e., the internal start_busy bit
+	 * transitions from 1 to 0
+	 */
+	writel(1 << IE_M_START_BUSY_SHIFT, iproc_i2c->base + IE_OFFSET);
+
+	/*
+	 * Now we can activate the transfer. For a read operation, specify the
+	 * number of bytes to read
+	 */
+	val = 1 << M_CMD_START_BUSY_SHIFT;
+	if (msg->flags & I2C_M_RD) {
+		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
+		       (msg->len << M_CMD_RD_CNT_SHIFT);
+	} else {
+		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
+	}
+	writel(val, iproc_i2c->base + M_CMD_OFFSET);
+
+	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+
+	if (!time_left) {
+		dev_err(iproc_i2c->device, "transaction times out\n");
+
+		/* flush FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return -EREMOTEIO;
+	}
+
+	ret = bcm_iproc_i2c_check_status(iproc_i2c);
+	if (ret) {
+		/* flush both TX/RX FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return ret;
+	}
+
+	/*
+	 * For a read operation, we now need to load the data from FIFO
+	 * into the memory buffer
+	 */
+	if (msg->flags & I2C_M_RD) {
+		for (i = 0; i < msg->len; i++) {
+			msg->buf[i] = (readl(iproc_i2c->base + M_RX_OFFSET) >>
+				      M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
+		}
+	}
+
+	dev_dbg(iproc_i2c->device, "xfer %c, addr=0x%02x, len=%d\n",
+		(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
+		msg->len);
+	dev_dbg(iproc_i2c->device, "**** data start ****\n");
+	for (i = 0; i < msg->len; i++)
+		dev_dbg(iproc_i2c->device, "0x%02x ",  msg->buf[i]);
+	dev_dbg(iproc_i2c->device, "**** data end ****\n");
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
+			      struct i2c_msg msgs[], int num)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = i2c_get_adapdata(adapter);
+	int ret, i;
+
+	/* go through all messages */
+	for (i = 0; i < num; i++) {
+		ret = bcm_iproc_i2c_xfer_single_msg(iproc_i2c, &msgs[i]);
+		if (ret) {
+			dev_err(iproc_i2c->device, "xfer failed\n");
+			return ret;
+		}
+	}
+
+	return num;
+}
+
+static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm bcm_iproc_algo = {
+	.master_xfer = bcm_iproc_i2c_xfer,
+	.functionality = bcm_iproc_i2c_functionality,
+};
+
+static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	unsigned int bus_speed, speed_bit;
+	u32 val;
+	int ret = of_property_read_u32(iproc_i2c->device->of_node,
+				       "clock-frequency", &bus_speed);
+	if (ret < 0) {
+		dev_err(iproc_i2c->device,
+			"missing clock-frequency property\n");
+		return -ENODEV;
+	}
+
+	if (bus_speed < 100000) {
+		dev_err(iproc_i2c->device, "%d Hz bus speed not supported\n",
+			bus_speed);
+		dev_err(iproc_i2c->device,
+			"valid speeds are 100khz and 400khz\n");
+		return -EINVAL;
+	} else if (bus_speed < 400000) {
+		speed_bit = 0;
+	} else {
+		/* bus_speed >= 400000 */
+		speed_bit = 1;
+	}
+
+	val = readl(iproc_i2c->base + TIM_CFG_OFFSET);
+	val &= ~(1 << TIME_CFG_MODE_400_SHIFT);
+	val |= speed_bit << TIME_CFG_MODE_400_SHIFT;
+	writel(val, iproc_i2c->base + TIM_CFG_OFFSET);
+
+	dev_info(iproc_i2c->device, "bus set to %u Hz\n", bus_speed);
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	/* put controller in reset */
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val |= 1 << CFG_RESET_SHIFT;
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* wait 100 usec per spec */
+	udelay(100);
+
+	/* bring controller out of reset */
+	val &= ~(1 << CFG_RESET_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
+	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
+	writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+
+	/* clear all pending interrupts */
+	writel(0xffffffff, iproc_i2c->base + IS_OFFSET);
+
+	return 0;
+}
+
+static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val |= 1 << CFG_EN_SHIFT;
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+}
+
+static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+}
+
+static int bcm_iproc_i2c_probe(struct platform_device *pdev)
+{
+	int irq, ret = 0;
+	struct bcm_iproc_i2c_dev *iproc_i2c;
+	struct i2c_adapter *adap;
+	struct resource *res;
+
+	iproc_i2c = devm_kzalloc(&pdev->dev, sizeof(*iproc_i2c),
+				 GFP_KERNEL);
+	if (!iproc_i2c)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, iproc_i2c);
+	iproc_i2c->device = &pdev->dev;
+	init_completion(&iproc_i2c->done);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	iproc_i2c->base = devm_ioremap_resource(iproc_i2c->device, res);
+	if (IS_ERR(iproc_i2c->base))
+		return PTR_ERR(iproc_i2c->base);
+
+	ret = bcm_iproc_i2c_init(iproc_i2c);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_cfg_speed(iproc_i2c);
+	if (ret)
+		return ret;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq <= 0) {
+		dev_err(iproc_i2c->device, "no irq resource\n");
+		return irq;
+	}
+	iproc_i2c->irq = irq;
+
+	ret = request_irq(irq, bcm_iproc_i2c_isr, 0, pdev->name, iproc_i2c);
+	if (ret < 0) {
+		dev_err(iproc_i2c->device, "unable to request irq %i\n", irq);
+		return ret;
+	}
+
+	bcm_iproc_i2c_enable(iproc_i2c);
+
+	adap = &iproc_i2c->adapter;
+	i2c_set_adapdata(adap, iproc_i2c);
+	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
+	adap->algo = &bcm_iproc_algo;
+	adap->dev.parent = &pdev->dev;
+	adap->dev.of_node = pdev->dev.of_node;
+
+	ret = i2c_add_adapter(adap);
+	if (ret) {
+		dev_err(iproc_i2c->device, "failed to add adapter\n");
+		free_irq(iproc_i2c->irq, iproc_i2c);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_remove(struct platform_device *pdev)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
+
+	i2c_del_adapter(&iproc_i2c->adapter);
+	free_irq(iproc_i2c->irq, iproc_i2c);
+	bcm_iproc_i2c_disable(iproc_i2c);
+
+	return 0;
+}
+
+static const struct of_device_id bcm_iproc_i2c_of_match[] = {
+	{.compatible = "brcm,iproc-i2c",},
+	{},
+};
+MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
+
+static struct platform_driver bcm_iproc_i2c_driver = {
+	.driver = {
+		.name = "bcm-iproc-i2c",
+		.of_match_table = bcm_iproc_i2c_of_match,
+	},
+	.probe = bcm_iproc_i2c_probe,
+	.remove = bcm_iproc_i2c_remove,
+};
+module_platform_driver(bcm_iproc_i2c_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v4 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
them disabled there. Individual I2C devices can be enabled in board
specific dts file when I2C slave devices are enabled in the future

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..f7d6c1d 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -70,6 +70,26 @@
 		};
 	};
 
+	i2c0: i2c@18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
+	i2c1: i2c@1800b000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x1800b000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 86 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
 	uart0: serial@18020000 {
 		compatible = "snps,dw-apb-uart";
 		reg = <0x18020000 0x100>;
-- 
1.7.9.5

[PATCH v4 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
them disabled there. Individual I2C devices can be enabled in board
specific dts file when I2C slave devices are enabled in the future

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..f7d6c1d 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -70,6 +70,26 @@
 		};
 	};
 
+	i2c0: i2c@18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
+	i2c1: i2c@1800b000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x1800b000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 86 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
 	uart0: serial@18020000 {
 		compatible = "snps,dw-apb-uart";
 		reg = <0x18020000 0x100>;
-- 
1.7.9.5

[PATCH v4 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
them disabled there. Individual I2C devices can be enabled in board
specific dts file when I2C slave devices are enabled in the future

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..f7d6c1d 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -70,6 +70,26 @@
 		};
 	};
 
+	i2c0: i2c at 18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
+	i2c1: i2c at 1800b000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x1800b000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 86 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
 	uart0: serial at 18020000 {
 		compatible = "snps,dw-apb-uart";
 		reg = <0x18020000 0x100>;
-- 
1.7.9.5

Re: [PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Uwe Kleine-König]

Hello,

On Wed, Jan 14, 2015 at 02:23:32PM -0800, Ray Jui wrote:
> +#include <linux/device.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/sched.h>
> +#include <linux/i2c.h>
> +#include <linux/interrupt.h>
> +#include <linux/platform_device.h>
> +#include <linux/clk.h>
> +#include <linux/io.h>
> +#include <linux/slab.h>
> +#include <linux/delay.h>
some of them are not needed. I tested on amd64 and efm32 and could drop
linux/device.h, linux/sched.h, linux/clk.h. (BTW, I wonder that you
don't need clk handling.)

> +#define TIM_CFG_OFFSET               0x04
> +#define TIME_CFG_MODE_400_SHIFT      31
Is the register name and the bit name prefix really different or is this
a typo?

> +static int __wait_for_bus_idle(struct bcm_iproc_i2c_dev *iproc_i2c)
A bcm_iproc_i2c prefix would be nice here.

> +static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *iproc_i2c,
> +				     struct i2c_msg *msg, u8 *addr)
> +{
> +
> +	if (msg->flags & I2C_M_TEN) {
> +		dev_err(iproc_i2c->device, "no support for 10-bit address\n");
> +		return -EINVAL;
> +	}
> +
> +	*addr = (msg->addr << 1);
You can also drop the parentheses.

> +	switch (val) {
> +	case M_CMD_STATUS_SUCCESS:
> +		return 0;
> +
> +	case M_CMD_STATUS_LOST_ARB:
> +		dev_err(iproc_i2c->device, "lost bus arbitration\n");
> +		return -EREMOTEIO;
> +
> +	case M_CMD_STATUS_NACK_ADDR:
> +		dev_err(iproc_i2c->device, "NAK addr:0x%02x\n",
> +			iproc_i2c->msg->addr);
> +		return -EREMOTEIO;
> +
> +	case M_CMD_STATUS_NACK_DATA:
> +		dev_err(iproc_i2c->device, "NAK data\n");
> +		return -EREMOTEIO;
> +
> +	case M_CMD_STATUS_TIMEOUT:
> +		dev_err(iproc_i2c->device, "bus timeout\n");
> +		return -ETIMEDOUT;
> +
> +	default:
> +		dev_err(iproc_i2c->device, "unknown error code=%d\n", val);
> +		return -EREMOTEIO;
> +	}
> +
> +	return -EREMOTEIO;
This is not reached.

> +}
> +
> +static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *iproc_i2c,
> +					 struct i2c_msg *msg)
> +{
> +	int ret, i;
> +	u8 addr;
> +	u32 val;
> +	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
> +
> +	if (msg->len < 1 || msg->len > M_TX_RX_FIFO_SIZE - 1) {
Is the < 1 a hardware or a software limitation? That means your driver
doesn't support I2C_SMBUS_QUICK which is used for example by i2cdetect.

> +		dev_err(iproc_i2c->device,
> +			"supported data length is 1 - %u bytes\n",
> +			M_TX_RX_FIFO_SIZE - 1);
> +		return -EINVAL;
> +	}
> +
> +	iproc_i2c->msg = msg;
Can it happen that iproc_i2c->msg still holds an uncompleted message
here or is this serialized by the core? Wolfram? Either here something
like:

	if (iproc_i2c->msg)
		return -EBUSY;

and

	iproc_i2c->msg = NULL;

when a transfer is completed is needed, or the respective code can be
dropped from other drivers (e.g. i2c-efm32).
On the other hand .msg is only used in bcm_iproc_i2c_check_status() to
give a diagnostic message. Maybe you can drop .msg and instead give it
as an additional parameter to bcm_iproc_i2c_check_status().

> +	ret = __wait_for_bus_idle(iproc_i2c);
> +	if (ret)
> +		return ret;
I would still prefer to have something like:

	if (bcm_iproc_i2c_bus_busy())
		return -EBUSY;

instead of a tight loop here.

> +	ret = bcm_iproc_i2c_format_addr(iproc_i2c, msg, &addr);
> +	if (ret)
> +		return ret;
> +
> +	/* load slave address into the TX FIFO */
> +	writel(addr, iproc_i2c->base + M_TX_OFFSET);
> +
> +	/* for a write transaction, load data into the TX FIFO */
> +	if (!(msg->flags & I2C_M_RD)) {
> +		for (i = 0; i < msg->len; i++) {
> +			val = msg->buf[i];
> +
> +			/* mark the last byte */
> +			if (i == msg->len - 1)
> +				val |= 1 << M_TX_WR_STATUS_SHIFT;
What happens if you don't mark this last byte? Could this be used to
support transfers bigger than the fifo size?

> +	/*
> +	 * Enable the "start busy" interrupt, which will be triggered after
> +	 * the transaction is done, i.e., the internal start_busy bit
s/\.,/./ I think

> +	 * transitions from 1 to 0
s/$/./
> +	 */
> +	writel(1 << IE_M_START_BUSY_SHIFT, iproc_i2c->base + IE_OFFSET);
> +
> +	/*
> +	 * Now we can activate the transfer. For a read operation, specify the
> +	 * number of bytes to read
s/$/./

> +	 */
> +	val = 1 << M_CMD_START_BUSY_SHIFT;
> +	if (msg->flags & I2C_M_RD) {
> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
> +		       (msg->len << M_CMD_RD_CNT_SHIFT);
> +	} else {
> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
> +	}
> +	writel(val, iproc_i2c->base + M_CMD_OFFSET);
> +
> +	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);

When the interrupt fires here after the complete timed out and before
you disable the irq you still throw the result away.
> +
> +	/* disable all interrupts */
> +	writel(0, iproc_i2c->base + IE_OFFSET);
> +
> +	if (!time_left) {
> +		dev_err(iproc_i2c->device, "transaction times out\n");
s/times/timed/

> +static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
> +{
> +	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
Note that I2C_FUNC_SMBUS_EMUL includes I2C_FUNC_SMBUS_QUICK, so your
driver claims to support transfers of length 0.

> +static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
> +{
> +	unsigned int bus_speed, speed_bit;
> +	u32 val;
> +	int ret = of_property_read_u32(iproc_i2c->device->of_node,
> +				       "clock-frequency", &bus_speed);
> +	if (ret < 0) {
> +		dev_err(iproc_i2c->device,
> +			"missing clock-frequency property\n");
> +		return -ENODEV;
Is a missing property the only situation where of_property_read_u32
returns an error? Would it be sane to default to 100 kHz?

> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
> +{
> +	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
> +
> +	i2c_del_adapter(&iproc_i2c->adapter);
You need to free the irq before i2c_del_adapter.

> +	free_irq(iproc_i2c->irq, iproc_i2c);
> +	bcm_iproc_i2c_disable(iproc_i2c);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id bcm_iproc_i2c_of_match[] = {
> +	{.compatible = "brcm,iproc-i2c",},
Not sure this is specified to be a must, but I'd add spaces after { and
before }.

> +	{},
It's a good habit to write this as

	{ /* sentinel */ }

without trailing comma.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

Re: [PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Uwe Kleine-König]

Hello,

On Wed, Jan 14, 2015 at 02:23:32PM -0800, Ray Jui wrote:
> +#include <linux/device.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/sched.h>
> +#include <linux/i2c.h>
> +#include <linux/interrupt.h>
> +#include <linux/platform_device.h>
> +#include <linux/clk.h>
> +#include <linux/io.h>
> +#include <linux/slab.h>
> +#include <linux/delay.h>
some of them are not needed. I tested on amd64 and efm32 and could drop
linux/device.h, linux/sched.h, linux/clk.h. (BTW, I wonder that you
don't need clk handling.)

> +#define TIM_CFG_OFFSET               0x04
> +#define TIME_CFG_MODE_400_SHIFT      31
Is the register name and the bit name prefix really different or is this
a typo?

> +static int __wait_for_bus_idle(struct bcm_iproc_i2c_dev *iproc_i2c)
A bcm_iproc_i2c prefix would be nice here.

> +static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *iproc_i2c,
> +				     struct i2c_msg *msg, u8 *addr)
> +{
> +
> +	if (msg->flags & I2C_M_TEN) {
> +		dev_err(iproc_i2c->device, "no support for 10-bit address\n");
> +		return -EINVAL;
> +	}
> +
> +	*addr = (msg->addr << 1);
You can also drop the parentheses.

> +	switch (val) {
> +	case M_CMD_STATUS_SUCCESS:
> +		return 0;
> +
> +	case M_CMD_STATUS_LOST_ARB:
> +		dev_err(iproc_i2c->device, "lost bus arbitration\n");
> +		return -EREMOTEIO;
> +
> +	case M_CMD_STATUS_NACK_ADDR:
> +		dev_err(iproc_i2c->device, "NAK addr:0x%02x\n",
> +			iproc_i2c->msg->addr);
> +		return -EREMOTEIO;
> +
> +	case M_CMD_STATUS_NACK_DATA:
> +		dev_err(iproc_i2c->device, "NAK data\n");
> +		return -EREMOTEIO;
> +
> +	case M_CMD_STATUS_TIMEOUT:
> +		dev_err(iproc_i2c->device, "bus timeout\n");
> +		return -ETIMEDOUT;
> +
> +	default:
> +		dev_err(iproc_i2c->device, "unknown error code=%d\n", val);
> +		return -EREMOTEIO;
> +	}
> +
> +	return -EREMOTEIO;
This is not reached.

> +}
> +
> +static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *iproc_i2c,
> +					 struct i2c_msg *msg)
> +{
> +	int ret, i;
> +	u8 addr;
> +	u32 val;
> +	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
> +
> +	if (msg->len < 1 || msg->len > M_TX_RX_FIFO_SIZE - 1) {
Is the < 1 a hardware or a software limitation? That means your driver
doesn't support I2C_SMBUS_QUICK which is used for example by i2cdetect.

> +		dev_err(iproc_i2c->device,
> +			"supported data length is 1 - %u bytes\n",
> +			M_TX_RX_FIFO_SIZE - 1);
> +		return -EINVAL;
> +	}
> +
> +	iproc_i2c->msg = msg;
Can it happen that iproc_i2c->msg still holds an uncompleted message
here or is this serialized by the core? Wolfram? Either here something
like:

	if (iproc_i2c->msg)
		return -EBUSY;

and

	iproc_i2c->msg = NULL;

when a transfer is completed is needed, or the respective code can be
dropped from other drivers (e.g. i2c-efm32).
On the other hand .msg is only used in bcm_iproc_i2c_check_status() to
give a diagnostic message. Maybe you can drop .msg and instead give it
as an additional parameter to bcm_iproc_i2c_check_status().

> +	ret = __wait_for_bus_idle(iproc_i2c);
> +	if (ret)
> +		return ret;
I would still prefer to have something like:

	if (bcm_iproc_i2c_bus_busy())
		return -EBUSY;

instead of a tight loop here.

> +	ret = bcm_iproc_i2c_format_addr(iproc_i2c, msg, &addr);
> +	if (ret)
> +		return ret;
> +
> +	/* load slave address into the TX FIFO */
> +	writel(addr, iproc_i2c->base + M_TX_OFFSET);
> +
> +	/* for a write transaction, load data into the TX FIFO */
> +	if (!(msg->flags & I2C_M_RD)) {
> +		for (i = 0; i < msg->len; i++) {
> +			val = msg->buf[i];
> +
> +			/* mark the last byte */
> +			if (i == msg->len - 1)
> +				val |= 1 << M_TX_WR_STATUS_SHIFT;
What happens if you don't mark this last byte? Could this be used to
support transfers bigger than the fifo size?

> +	/*
> +	 * Enable the "start busy" interrupt, which will be triggered after
> +	 * the transaction is done, i.e., the internal start_busy bit
s/\.,/./ I think

> +	 * transitions from 1 to 0
s/$/./
> +	 */
> +	writel(1 << IE_M_START_BUSY_SHIFT, iproc_i2c->base + IE_OFFSET);
> +
> +	/*
> +	 * Now we can activate the transfer. For a read operation, specify the
> +	 * number of bytes to read
s/$/./

> +	 */
> +	val = 1 << M_CMD_START_BUSY_SHIFT;
> +	if (msg->flags & I2C_M_RD) {
> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
> +		       (msg->len << M_CMD_RD_CNT_SHIFT);
> +	} else {
> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
> +	}
> +	writel(val, iproc_i2c->base + M_CMD_OFFSET);
> +
> +	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);

When the interrupt fires here after the complete timed out and before
you disable the irq you still throw the result away.
> +
> +	/* disable all interrupts */
> +	writel(0, iproc_i2c->base + IE_OFFSET);
> +
> +	if (!time_left) {
> +		dev_err(iproc_i2c->device, "transaction times out\n");
s/times/timed/

> +static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
> +{
> +	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
Note that I2C_FUNC_SMBUS_EMUL includes I2C_FUNC_SMBUS_QUICK, so your
driver claims to support transfers of length 0.

> +static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
> +{
> +	unsigned int bus_speed, speed_bit;
> +	u32 val;
> +	int ret = of_property_read_u32(iproc_i2c->device->of_node,
> +				       "clock-frequency", &bus_speed);
> +	if (ret < 0) {
> +		dev_err(iproc_i2c->device,
> +			"missing clock-frequency property\n");
> +		return -ENODEV;
Is a missing property the only situation where of_property_read_u32
returns an error? Would it be sane to default to 100 kHz?

> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
> +{
> +	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
> +
> +	i2c_del_adapter(&iproc_i2c->adapter);
You need to free the irq before i2c_del_adapter.

> +	free_irq(iproc_i2c->irq, iproc_i2c);
> +	bcm_iproc_i2c_disable(iproc_i2c);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id bcm_iproc_i2c_of_match[] = {
> +	{.compatible = "brcm,iproc-i2c",},
Not sure this is specified to be a must, but I'd add spaces after { and
before }.

> +	{},
It's a good habit to write this as

	{ /* sentinel */ }

without trailing comma.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

[PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Uwe Kleine-König]

Hello,

On Wed, Jan 14, 2015 at 02:23:32PM -0800, Ray Jui wrote:
> +#include <linux/device.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/sched.h>
> +#include <linux/i2c.h>
> +#include <linux/interrupt.h>
> +#include <linux/platform_device.h>
> +#include <linux/clk.h>
> +#include <linux/io.h>
> +#include <linux/slab.h>
> +#include <linux/delay.h>
some of them are not needed. I tested on amd64 and efm32 and could drop
linux/device.h, linux/sched.h, linux/clk.h. (BTW, I wonder that you
don't need clk handling.)

> +#define TIM_CFG_OFFSET               0x04
> +#define TIME_CFG_MODE_400_SHIFT      31
Is the register name and the bit name prefix really different or is this
a typo?

> +static int __wait_for_bus_idle(struct bcm_iproc_i2c_dev *iproc_i2c)
A bcm_iproc_i2c prefix would be nice here.

> +static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *iproc_i2c,
> +				     struct i2c_msg *msg, u8 *addr)
> +{
> +
> +	if (msg->flags & I2C_M_TEN) {
> +		dev_err(iproc_i2c->device, "no support for 10-bit address\n");
> +		return -EINVAL;
> +	}
> +
> +	*addr = (msg->addr << 1);
You can also drop the parentheses.

> +	switch (val) {
> +	case M_CMD_STATUS_SUCCESS:
> +		return 0;
> +
> +	case M_CMD_STATUS_LOST_ARB:
> +		dev_err(iproc_i2c->device, "lost bus arbitration\n");
> +		return -EREMOTEIO;
> +
> +	case M_CMD_STATUS_NACK_ADDR:
> +		dev_err(iproc_i2c->device, "NAK addr:0x%02x\n",
> +			iproc_i2c->msg->addr);
> +		return -EREMOTEIO;
> +
> +	case M_CMD_STATUS_NACK_DATA:
> +		dev_err(iproc_i2c->device, "NAK data\n");
> +		return -EREMOTEIO;
> +
> +	case M_CMD_STATUS_TIMEOUT:
> +		dev_err(iproc_i2c->device, "bus timeout\n");
> +		return -ETIMEDOUT;
> +
> +	default:
> +		dev_err(iproc_i2c->device, "unknown error code=%d\n", val);
> +		return -EREMOTEIO;
> +	}
> +
> +	return -EREMOTEIO;
This is not reached.

> +}
> +
> +static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *iproc_i2c,
> +					 struct i2c_msg *msg)
> +{
> +	int ret, i;
> +	u8 addr;
> +	u32 val;
> +	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
> +
> +	if (msg->len < 1 || msg->len > M_TX_RX_FIFO_SIZE - 1) {
Is the < 1 a hardware or a software limitation? That means your driver
doesn't support I2C_SMBUS_QUICK which is used for example by i2cdetect.

> +		dev_err(iproc_i2c->device,
> +			"supported data length is 1 - %u bytes\n",
> +			M_TX_RX_FIFO_SIZE - 1);
> +		return -EINVAL;
> +	}
> +
> +	iproc_i2c->msg = msg;
Can it happen that iproc_i2c->msg still holds an uncompleted message
here or is this serialized by the core? Wolfram? Either here something
like:

	if (iproc_i2c->msg)
		return -EBUSY;

and

	iproc_i2c->msg = NULL;

when a transfer is completed is needed, or the respective code can be
dropped from other drivers (e.g. i2c-efm32).
On the other hand .msg is only used in bcm_iproc_i2c_check_status() to
give a diagnostic message. Maybe you can drop .msg and instead give it
as an additional parameter to bcm_iproc_i2c_check_status().

> +	ret = __wait_for_bus_idle(iproc_i2c);
> +	if (ret)
> +		return ret;
I would still prefer to have something like:

	if (bcm_iproc_i2c_bus_busy())
		return -EBUSY;

instead of a tight loop here.

> +	ret = bcm_iproc_i2c_format_addr(iproc_i2c, msg, &addr);
> +	if (ret)
> +		return ret;
> +
> +	/* load slave address into the TX FIFO */
> +	writel(addr, iproc_i2c->base + M_TX_OFFSET);
> +
> +	/* for a write transaction, load data into the TX FIFO */
> +	if (!(msg->flags & I2C_M_RD)) {
> +		for (i = 0; i < msg->len; i++) {
> +			val = msg->buf[i];
> +
> +			/* mark the last byte */
> +			if (i == msg->len - 1)
> +				val |= 1 << M_TX_WR_STATUS_SHIFT;
What happens if you don't mark this last byte? Could this be used to
support transfers bigger than the fifo size?

> +	/*
> +	 * Enable the "start busy" interrupt, which will be triggered after
> +	 * the transaction is done, i.e., the internal start_busy bit
s/\.,/./ I think

> +	 * transitions from 1 to 0
s/$/./
> +	 */
> +	writel(1 << IE_M_START_BUSY_SHIFT, iproc_i2c->base + IE_OFFSET);
> +
> +	/*
> +	 * Now we can activate the transfer. For a read operation, specify the
> +	 * number of bytes to read
s/$/./

> +	 */
> +	val = 1 << M_CMD_START_BUSY_SHIFT;
> +	if (msg->flags & I2C_M_RD) {
> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
> +		       (msg->len << M_CMD_RD_CNT_SHIFT);
> +	} else {
> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
> +	}
> +	writel(val, iproc_i2c->base + M_CMD_OFFSET);
> +
> +	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);

When the interrupt fires here after the complete timed out and before
you disable the irq you still throw the result away.
> +
> +	/* disable all interrupts */
> +	writel(0, iproc_i2c->base + IE_OFFSET);
> +
> +	if (!time_left) {
> +		dev_err(iproc_i2c->device, "transaction times out\n");
s/times/timed/

> +static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
> +{
> +	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
Note that I2C_FUNC_SMBUS_EMUL includes I2C_FUNC_SMBUS_QUICK, so your
driver claims to support transfers of length 0.

> +static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
> +{
> +	unsigned int bus_speed, speed_bit;
> +	u32 val;
> +	int ret = of_property_read_u32(iproc_i2c->device->of_node,
> +				       "clock-frequency", &bus_speed);
> +	if (ret < 0) {
> +		dev_err(iproc_i2c->device,
> +			"missing clock-frequency property\n");
> +		return -ENODEV;
Is a missing property the only situation where of_property_read_u32
returns an error? Would it be sane to default to 100 kHz?

> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
> +{
> +	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
> +
> +	i2c_del_adapter(&iproc_i2c->adapter);
You need to free the irq before i2c_del_adapter.

> +	free_irq(iproc_i2c->irq, iproc_i2c);
> +	bcm_iproc_i2c_disable(iproc_i2c);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id bcm_iproc_i2c_of_match[] = {
> +	{.compatible = "brcm,iproc-i2c",},
Not sure this is specified to be a must, but I'd add spaces after { and
before }.

> +	{},
It's a good habit to write this as

	{ /* sentinel */ }

without trailing comma.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-K?nig            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

Re: [PATCH v4 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Uwe Kleine-König]

Hello,

On Wed, Jan 14, 2015 at 02:23:33PM -0800, Ray Jui wrote:
> Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
> them disabled there. Individual I2C devices can be enabled in board
> specific dts file when I2C slave devices are enabled in the future
s/$/./

> 
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> ---
>  arch/arm/boot/dts/bcm-cygnus.dtsi |   20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
> index 5126f9e..f7d6c1d 100644
> --- a/arch/arm/boot/dts/bcm-cygnus.dtsi
> +++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
> @@ -70,6 +70,26 @@
>  		};
>  	};
>  
> +	i2c0: i2c@18008000 {
> +		compatible = "brcm,iproc-i2c";
in patch 2 you wrote the driver is for a family of SoCs, right? Then I'd
make this:

	compatible = "brcm,$mysoc-iproc-i2c", "brcm,iproc-i2c";

(or maybe s/$mysoc-iproc-i2c/$mysoc-i2c/).

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

Re: [PATCH v4 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Uwe Kleine-König]

Hello,

On Wed, Jan 14, 2015 at 02:23:33PM -0800, Ray Jui wrote:
> Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
> them disabled there. Individual I2C devices can be enabled in board
> specific dts file when I2C slave devices are enabled in the future
s/$/./

> 
> Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
> Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
> ---
>  arch/arm/boot/dts/bcm-cygnus.dtsi |   20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
> index 5126f9e..f7d6c1d 100644
> --- a/arch/arm/boot/dts/bcm-cygnus.dtsi
> +++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
> @@ -70,6 +70,26 @@
>  		};
>  	};
>  
> +	i2c0: i2c@18008000 {
> +		compatible = "brcm,iproc-i2c";
in patch 2 you wrote the driver is for a family of SoCs, right? Then I'd
make this:

	compatible = "brcm,$mysoc-iproc-i2c", "brcm,iproc-i2c";

(or maybe s/$mysoc-iproc-i2c/$mysoc-i2c/).

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

[PATCH v4 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Uwe Kleine-König]

Hello,

On Wed, Jan 14, 2015 at 02:23:33PM -0800, Ray Jui wrote:
> Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
> them disabled there. Individual I2C devices can be enabled in board
> specific dts file when I2C slave devices are enabled in the future
s/$/./

> 
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> ---
>  arch/arm/boot/dts/bcm-cygnus.dtsi |   20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
> index 5126f9e..f7d6c1d 100644
> --- a/arch/arm/boot/dts/bcm-cygnus.dtsi
> +++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
> @@ -70,6 +70,26 @@
>  		};
>  	};
>  
> +	i2c0: i2c at 18008000 {
> +		compatible = "brcm,iproc-i2c";
in patch 2 you wrote the driver is for a family of SoCs, right? Then I'd
make this:

	compatible = "brcm,$mysoc-iproc-i2c", "brcm,iproc-i2c";

(or maybe s/$mysoc-iproc-i2c/$mysoc-i2c/).

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-K?nig            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

Re: [PATCH v3 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Wolfram Sang]

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> >> +	case M_CMD_STATUS_LOST_ARB:
> >> +		dev_err(dev->device, "lost bus arbitration\n");
> > I wouldn't dev_err that, only dev_dbg. I'm not sure how usual the errors
> > for the next two cases is, maybe degrade them to dev_dbg, too?
> > 
> These errors are rare, and it's nice to keep them at the dev_err level
> so the user will be more aware.

This is wrong. Arbitration lost and NACK is pretty standard stuff on an
I2C bus. User doesn't need to know about it, it is just noise in the
logs. Timeout is different, you can report that (although I should
probably move such a message into the core). Please also use the proper
errno codes defined in Documentation/i2c/fault-codes. They should be
distinct enough to drop the messages.

> 
> >> +		return -EREMOTEIO;
> >> +
> >> +	case M_CMD_STATUS_NACK_ADDR:
> >> +		dev_err(dev->device, "NAK addr:0x%02x\n", dev->msg->addr);
> >> +		return -EREMOTEIO;
> >> +
> >> +	case M_CMD_STATUS_NACK_DATA:
> >> +		dev_err(dev->device, "NAK data\n");
> >> +		return -EREMOTEIO;
> >> +
> >> +	case M_CMD_STATUS_TIMEOUT:
> >> +		dev_err(dev->device, "bus timeout\n");
> >> +		return -ETIMEDOUT;
> >> +
> >> +	default:
> >> +		dev_err(dev->device, "unknown error code=%d\n", val);
> >> +		return -EREMOTEIO;
> >> +	}
> >> +
> >> +	return -EREMOTEIO;
> >> +}

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Re: [PATCH v3 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Wolfram Sang]

[-- Attachment #1: Type: text/plain, Size: 1331 bytes --]

> >> +	case M_CMD_STATUS_LOST_ARB:
> >> +		dev_err(dev->device, "lost bus arbitration\n");
> > I wouldn't dev_err that, only dev_dbg. I'm not sure how usual the errors
> > for the next two cases is, maybe degrade them to dev_dbg, too?
> > 
> These errors are rare, and it's nice to keep them at the dev_err level
> so the user will be more aware.

This is wrong. Arbitration lost and NACK is pretty standard stuff on an
I2C bus. User doesn't need to know about it, it is just noise in the
logs. Timeout is different, you can report that (although I should
probably move such a message into the core). Please also use the proper
errno codes defined in Documentation/i2c/fault-codes. They should be
distinct enough to drop the messages.

> 
> >> +		return -EREMOTEIO;
> >> +
> >> +	case M_CMD_STATUS_NACK_ADDR:
> >> +		dev_err(dev->device, "NAK addr:0x%02x\n", dev->msg->addr);
> >> +		return -EREMOTEIO;
> >> +
> >> +	case M_CMD_STATUS_NACK_DATA:
> >> +		dev_err(dev->device, "NAK data\n");
> >> +		return -EREMOTEIO;
> >> +
> >> +	case M_CMD_STATUS_TIMEOUT:
> >> +		dev_err(dev->device, "bus timeout\n");
> >> +		return -ETIMEDOUT;
> >> +
> >> +	default:
> >> +		dev_err(dev->device, "unknown error code=%d\n", val);
> >> +		return -EREMOTEIO;
> >> +	}
> >> +
> >> +	return -EREMOTEIO;
> >> +}

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[PATCH v3 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Wolfram Sang]

> >> +	case M_CMD_STATUS_LOST_ARB:
> >> +		dev_err(dev->device, "lost bus arbitration\n");
> > I wouldn't dev_err that, only dev_dbg. I'm not sure how usual the errors
> > for the next two cases is, maybe degrade them to dev_dbg, too?
> > 
> These errors are rare, and it's nice to keep them at the dev_err level
> so the user will be more aware.

This is wrong. Arbitration lost and NACK is pretty standard stuff on an
I2C bus. User doesn't need to know about it, it is just noise in the
logs. Timeout is different, you can report that (although I should
probably move such a message into the core). Please also use the proper
errno codes defined in Documentation/i2c/fault-codes. They should be
distinct enough to drop the messages.

> 
> >> +		return -EREMOTEIO;
> >> +
> >> +	case M_CMD_STATUS_NACK_ADDR:
> >> +		dev_err(dev->device, "NAK addr:0x%02x\n", dev->msg->addr);
> >> +		return -EREMOTEIO;
> >> +
> >> +	case M_CMD_STATUS_NACK_DATA:
> >> +		dev_err(dev->device, "NAK data\n");
> >> +		return -EREMOTEIO;
> >> +
> >> +	case M_CMD_STATUS_TIMEOUT:
> >> +		dev_err(dev->device, "bus timeout\n");
> >> +		return -ETIMEDOUT;
> >> +
> >> +	default:
> >> +		dev_err(dev->device, "unknown error code=%d\n", val);
> >> +		return -EREMOTEIO;
> >> +	}
> >> +
> >> +	return -EREMOTEIO;
> >> +}
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Re: [PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Wolfram Sang]

[-- Attachment #1: Type: text/plain, Size: 1188 bytes --]


> > +	iproc_i2c->msg = msg;
> Can it happen that iproc_i2c->msg still holds an uncompleted message
> here or is this serialized by the core? Wolfram? Either here something

We have per-adapter locks serializing transfers, if you mean that?

> > +static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
> > +{
> > +	unsigned int bus_speed, speed_bit;
> > +	u32 val;
> > +	int ret = of_property_read_u32(iproc_i2c->device->of_node,
> > +				       "clock-frequency", &bus_speed);
> > +	if (ret < 0) {
> > +		dev_err(iproc_i2c->device,
> > +			"missing clock-frequency property\n");
> > +		return -ENODEV;
> Is a missing property the only situation where of_property_read_u32
> returns an error? Would it be sane to default to 100 kHz?

Default of 100kHz instead of -ENODEV sounds very reasonable.

> > +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
> > +{
> > +	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
> > +
> > +	i2c_del_adapter(&iproc_i2c->adapter);
> You need to free the irq before i2c_del_adapter.

One could also keep using devm_request_irq and disable all interrupts
sources here?

Thanks for the reviews, Uwe!

   Wolfram


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Re: [PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Wolfram Sang]

[-- Attachment #1: Type: text/plain, Size: 1188 bytes --]


> > +	iproc_i2c->msg = msg;
> Can it happen that iproc_i2c->msg still holds an uncompleted message
> here or is this serialized by the core? Wolfram? Either here something

We have per-adapter locks serializing transfers, if you mean that?

> > +static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
> > +{
> > +	unsigned int bus_speed, speed_bit;
> > +	u32 val;
> > +	int ret = of_property_read_u32(iproc_i2c->device->of_node,
> > +				       "clock-frequency", &bus_speed);
> > +	if (ret < 0) {
> > +		dev_err(iproc_i2c->device,
> > +			"missing clock-frequency property\n");
> > +		return -ENODEV;
> Is a missing property the only situation where of_property_read_u32
> returns an error? Would it be sane to default to 100 kHz?

Default of 100kHz instead of -ENODEV sounds very reasonable.

> > +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
> > +{
> > +	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
> > +
> > +	i2c_del_adapter(&iproc_i2c->adapter);
> You need to free the irq before i2c_del_adapter.

One could also keep using devm_request_irq and disable all interrupts
sources here?

Thanks for the reviews, Uwe!

   Wolfram


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[PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Wolfram Sang]

> > +	iproc_i2c->msg = msg;
> Can it happen that iproc_i2c->msg still holds an uncompleted message
> here or is this serialized by the core? Wolfram? Either here something

We have per-adapter locks serializing transfers, if you mean that?

> > +static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
> > +{
> > +	unsigned int bus_speed, speed_bit;
> > +	u32 val;
> > +	int ret = of_property_read_u32(iproc_i2c->device->of_node,
> > +				       "clock-frequency", &bus_speed);
> > +	if (ret < 0) {
> > +		dev_err(iproc_i2c->device,
> > +			"missing clock-frequency property\n");
> > +		return -ENODEV;
> Is a missing property the only situation where of_property_read_u32
> returns an error? Would it be sane to default to 100 kHz?

Default of 100kHz instead of -ENODEV sounds very reasonable.

> > +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
> > +{
> > +	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
> > +
> > +	i2c_del_adapter(&iproc_i2c->adapter);
> You need to free the irq before i2c_del_adapter.

One could also keep using devm_request_irq and disable all interrupts
sources here?

Thanks for the reviews, Uwe!

   Wolfram

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Re: [PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Uwe Kleine-König]

Hello,

On Thu, Jan 15, 2015 at 01:07:05PM +0100, Wolfram Sang wrote:
> > > +	iproc_i2c->msg = msg;
> > Can it happen that iproc_i2c->msg still holds an uncompleted message
> > here or is this serialized by the core? Wolfram? Either here something
> 
> We have per-adapter locks serializing transfers, if you mean that?
ok, so in the efm32 driver the if (ddata->msgs) condition in
efm32_i2c_master_xfer can never be true, right?

> > > +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
> > > +{
> > > +	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
> > > +
> > > +	i2c_del_adapter(&iproc_i2c->adapter);
> > You need to free the irq before i2c_del_adapter.
> 
> One could also keep using devm_request_irq and disable all interrupts
> sources here?
calling devm_free_irq would work or writel(0, iproc_i2c->base +
IE_OFFSET) + synchronize_irq().

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

Re: [PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Uwe Kleine-König]

Hello,

On Thu, Jan 15, 2015 at 01:07:05PM +0100, Wolfram Sang wrote:
> > > +	iproc_i2c->msg = msg;
> > Can it happen that iproc_i2c->msg still holds an uncompleted message
> > here or is this serialized by the core? Wolfram? Either here something
> 
> We have per-adapter locks serializing transfers, if you mean that?
ok, so in the efm32 driver the if (ddata->msgs) condition in
efm32_i2c_master_xfer can never be true, right?

> > > +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
> > > +{
> > > +	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
> > > +
> > > +	i2c_del_adapter(&iproc_i2c->adapter);
> > You need to free the irq before i2c_del_adapter.
> 
> One could also keep using devm_request_irq and disable all interrupts
> sources here?
calling devm_free_irq would work or writel(0, iproc_i2c->base +
IE_OFFSET) + synchronize_irq().

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

[PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Uwe Kleine-König]

Hello,

On Thu, Jan 15, 2015 at 01:07:05PM +0100, Wolfram Sang wrote:
> > > +	iproc_i2c->msg = msg;
> > Can it happen that iproc_i2c->msg still holds an uncompleted message
> > here or is this serialized by the core? Wolfram? Either here something
> 
> We have per-adapter locks serializing transfers, if you mean that?
ok, so in the efm32 driver the if (ddata->msgs) condition in
efm32_i2c_master_xfer can never be true, right?

> > > +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
> > > +{
> > > +	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
> > > +
> > > +	i2c_del_adapter(&iproc_i2c->adapter);
> > You need to free the irq before i2c_del_adapter.
> 
> One could also keep using devm_request_irq and disable all interrupts
> sources here?
calling devm_free_irq would work or writel(0, iproc_i2c->base +
IE_OFFSET) + synchronize_irq().

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-K?nig            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

Re: [PATCH v6 2/3] gpio: Cygnus: add GPIO driver

[Linus Walleij]

On Tue, Jan 13, 2015 at 6:05 PM, Ray Jui <rjui@broadcom.com> wrote:
> On 1/13/2015 12:53 AM, Linus Walleij wrote:
>> On Tue, Dec 16, 2014 at 3:18 AM, Ray Jui <rjui@broadcom.com> wrote:
>>
>>> +/* drive strength control for ASIU GPIO */
>>> +#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
>>> +
>>> +/* drive strength control for CCM GPIO */
>>> +#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00
>>
>> This stuff (drive strength) is pin control, pin config.
>> It does not belong in a pure GPIO driver. If you're
>> making a combined pin control + GPIO driver, it
>> shall be put in drivers/pinctrl/*
>>
> Okay, I have some questions here. Are you suggesting me to register this
> driver to both the pinctrl subsystem and gpiolib and move it to under
> drivers/pinctrl/*?

Either you can have a combined driver in drivers/pinctrl/*
which has one probe() function calling pinctrl_register(),
gpiochip_add(), gpiochip_add_pin_range(), having the gpio
parts call into the pin control backend with
pinctrl_request_gpio(), pinctrl_free_gpio(),
pinctrl_gpio_direction_input(), pinctrl_gpio_direction_output().

Or you can split it in one driver in drivers/pinctrl/*
dealing with just the pin control stuff, and another driver
in drivers/gpio/* dealing with the GPIO stuff, each with one
probe() function.

If they are using the same register range, the first approach
is probably most intuitive. If the pin control and GPIO parts
are separated in different register ranges, probably the
second approach is the best.

> Or Are you suggesting me to combine this driver with the other Cygnus
> pinctrl driver (which only supports pinmux)?

Depends on which hardware block the pin control-like
registers belongs in. See per above.

> Note in Cygnus, all pinmux logic is done in the pinmux block. And there
> are 3 GPIO controllers, that handle GPIO, drive strength of the GPIO
> pins, internal pull up/down of the GPIO pins, which are handled in this
> driver. So this driver is generic to all 3 GPIO controllers, as you can
> see from the device tree bindings, there are 3 nodes.
>
> Therefore, I think it makes sense to have one pinmux driver that handles
> the pinmux block, and one generic pinctrl + gpio driver that handles
> functions supported by all 3 GPIO controllers. Does this make sense to you?

Yep.

Some hardware designs put the software-controlled biasing
resistors in the GPIO block electronically connected to the actual
pins, so that e.g. the biasing will be available if some MMC or
whatever is using the same pins in another muxing. In such
situations it's quite evident that they need to be a combined
GPIO and pin controller.

I have some regrets that bolting a second pin controller to the
GPIO chip make things a bit complex but it's a price we have
to pay for getting some kind of generic interface.

Yours,
Linus Walleij

Re: [PATCH v6 2/3] gpio: Cygnus: add GPIO driver

[Linus Walleij]

On Tue, Jan 13, 2015 at 6:05 PM, Ray Jui <rjui@broadcom.com> wrote:
> On 1/13/2015 12:53 AM, Linus Walleij wrote:
>> On Tue, Dec 16, 2014 at 3:18 AM, Ray Jui <rjui@broadcom.com> wrote:
>>
>>> +/* drive strength control for ASIU GPIO */
>>> +#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
>>> +
>>> +/* drive strength control for CCM GPIO */
>>> +#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00
>>
>> This stuff (drive strength) is pin control, pin config.
>> It does not belong in a pure GPIO driver. If you're
>> making a combined pin control + GPIO driver, it
>> shall be put in drivers/pinctrl/*
>>
> Okay, I have some questions here. Are you suggesting me to register this
> driver to both the pinctrl subsystem and gpiolib and move it to under
> drivers/pinctrl/*?

Either you can have a combined driver in drivers/pinctrl/*
which has one probe() function calling pinctrl_register(),
gpiochip_add(), gpiochip_add_pin_range(), having the gpio
parts call into the pin control backend with
pinctrl_request_gpio(), pinctrl_free_gpio(),
pinctrl_gpio_direction_input(), pinctrl_gpio_direction_output().

Or you can split it in one driver in drivers/pinctrl/*
dealing with just the pin control stuff, and another driver
in drivers/gpio/* dealing with the GPIO stuff, each with one
probe() function.

If they are using the same register range, the first approach
is probably most intuitive. If the pin control and GPIO parts
are separated in different register ranges, probably the
second approach is the best.

> Or Are you suggesting me to combine this driver with the other Cygnus
> pinctrl driver (which only supports pinmux)?

Depends on which hardware block the pin control-like
registers belongs in. See per above.

> Note in Cygnus, all pinmux logic is done in the pinmux block. And there
> are 3 GPIO controllers, that handle GPIO, drive strength of the GPIO
> pins, internal pull up/down of the GPIO pins, which are handled in this
> driver. So this driver is generic to all 3 GPIO controllers, as you can
> see from the device tree bindings, there are 3 nodes.
>
> Therefore, I think it makes sense to have one pinmux driver that handles
> the pinmux block, and one generic pinctrl + gpio driver that handles
> functions supported by all 3 GPIO controllers. Does this make sense to you?

Yep.

Some hardware designs put the software-controlled biasing
resistors in the GPIO block electronically connected to the actual
pins, so that e.g. the biasing will be available if some MMC or
whatever is using the same pins in another muxing. In such
situations it's quite evident that they need to be a combined
GPIO and pin controller.

I have some regrets that bolting a second pin controller to the
GPIO chip make things a bit complex but it's a price we have
to pay for getting some kind of generic interface.

Yours,
Linus Walleij

[PATCH v6 2/3] gpio: Cygnus: add GPIO driver

[Linus Walleij]

On Tue, Jan 13, 2015 at 6:05 PM, Ray Jui <rjui@broadcom.com> wrote:
> On 1/13/2015 12:53 AM, Linus Walleij wrote:
>> On Tue, Dec 16, 2014 at 3:18 AM, Ray Jui <rjui@broadcom.com> wrote:
>>
>>> +/* drive strength control for ASIU GPIO */
>>> +#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
>>> +
>>> +/* drive strength control for CCM GPIO */
>>> +#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00
>>
>> This stuff (drive strength) is pin control, pin config.
>> It does not belong in a pure GPIO driver. If you're
>> making a combined pin control + GPIO driver, it
>> shall be put in drivers/pinctrl/*
>>
> Okay, I have some questions here. Are you suggesting me to register this
> driver to both the pinctrl subsystem and gpiolib and move it to under
> drivers/pinctrl/*?

Either you can have a combined driver in drivers/pinctrl/*
which has one probe() function calling pinctrl_register(),
gpiochip_add(), gpiochip_add_pin_range(), having the gpio
parts call into the pin control backend with
pinctrl_request_gpio(), pinctrl_free_gpio(),
pinctrl_gpio_direction_input(), pinctrl_gpio_direction_output().

Or you can split it in one driver in drivers/pinctrl/*
dealing with just the pin control stuff, and another driver
in drivers/gpio/* dealing with the GPIO stuff, each with one
probe() function.

If they are using the same register range, the first approach
is probably most intuitive. If the pin control and GPIO parts
are separated in different register ranges, probably the
second approach is the best.

> Or Are you suggesting me to combine this driver with the other Cygnus
> pinctrl driver (which only supports pinmux)?

Depends on which hardware block the pin control-like
registers belongs in. See per above.

> Note in Cygnus, all pinmux logic is done in the pinmux block. And there
> are 3 GPIO controllers, that handle GPIO, drive strength of the GPIO
> pins, internal pull up/down of the GPIO pins, which are handled in this
> driver. So this driver is generic to all 3 GPIO controllers, as you can
> see from the device tree bindings, there are 3 nodes.
>
> Therefore, I think it makes sense to have one pinmux driver that handles
> the pinmux block, and one generic pinctrl + gpio driver that handles
> functions supported by all 3 GPIO controllers. Does this make sense to you?

Yep.

Some hardware designs put the software-controlled biasing
resistors in the GPIO block electronically connected to the actual
pins, so that e.g. the biasing will be available if some MMC or
whatever is using the same pins in another muxing. In such
situations it's quite evident that they need to be a combined
GPIO and pin controller.

I have some regrets that bolting a second pin controller to the
GPIO chip make things a bit complex but it's a price we have
to pay for getting some kind of generic interface.

Yours,
Linus Walleij

Re: [PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Linus Walleij]

On Tue, Jan 13, 2015 at 12:41 PM, Russell King - ARM Linux
<linux@arm.linux.org.uk> wrote:
> On Tue, Jan 13, 2015 at 09:06:15AM +0100, Linus Walleij wrote:
>> On Wed, Dec 17, 2014 at 11:44 AM, Russell King - ARM Linux
>> <linux@arm.linux.org.uk> wrote:
>> > On Wed, Dec 17, 2014 at 11:45:01AM +0900, Alexandre Courbot wrote:
>> >> Actually we are not that far from being able to do completely without
>> >> any GPIO number, and maybe that's what we should aim for. I think the
>> >> only remaining offender is the sysfs interface.
>> >
>> > And that is a user API, and there's lots of users of it (eg, on Raspberry
>> > Pi platforms.)  So changing it isn't going to be easy - I'd say that it's
>> > impractical.
>> >
>> > What you're suggesting would be like re-numbering Linux syscalls.
>>
>> The problem is that right now if we set the .base of a gpio_chip
>> to -1 for dynamic allocation of GPIO numbers and we have more
>> than one GPIO chip in the system, the numbers basically depend
>> on probe order, and may theoretically even differ between two boots.
>>
>> So in these cases preserving the ABI means preserving the
>> unpredictability of these assigned numbers or something.
>>
>> For the old usecases with a single GPIO controller and a fixed
>> base offset of e.g. 0 (which I suspect was implicit in the initial
>> design of the subsystem) things work fine as always, it's these new
>> dynamic use cases that destabilize the ABI.
>
> Since GPIOs are exported through sysfs into userland by GPIO number,
> and we know that there are users of it (see
> https://github.com/pilight/wiringX) which hard encode GPIO numbers,
> so this is *really* something that we as kernel developers can't
> change without breaking such users.

I agree.

In some other thread I came up with the idea that if
we add enumerated aliases for the GPIO controllers in the
device tree (so that each can be assigned a sequence number,
like we do on the PL011 ttys) we can assign them numbers
starting from 0.

The only reason that dynamic GPIO start from some random
high offset is that the on-chip GPIOs are assumed to be present
at offset 0+, so this is done so that the dynamic controllers
avoid colliding with them. (At least that is how I understand it.)
So on a fully DT-enabled system assigning numbers starting
from 0 should be kind of default.

Yours,
Linus Walleij

Re: [PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Linus Walleij]

On Tue, Jan 13, 2015 at 12:41 PM, Russell King - ARM Linux
<linux@arm.linux.org.uk> wrote:
> On Tue, Jan 13, 2015 at 09:06:15AM +0100, Linus Walleij wrote:
>> On Wed, Dec 17, 2014 at 11:44 AM, Russell King - ARM Linux
>> <linux@arm.linux.org.uk> wrote:
>> > On Wed, Dec 17, 2014 at 11:45:01AM +0900, Alexandre Courbot wrote:
>> >> Actually we are not that far from being able to do completely without
>> >> any GPIO number, and maybe that's what we should aim for. I think the
>> >> only remaining offender is the sysfs interface.
>> >
>> > And that is a user API, and there's lots of users of it (eg, on Raspberry
>> > Pi platforms.)  So changing it isn't going to be easy - I'd say that it's
>> > impractical.
>> >
>> > What you're suggesting would be like re-numbering Linux syscalls.
>>
>> The problem is that right now if we set the .base of a gpio_chip
>> to -1 for dynamic allocation of GPIO numbers and we have more
>> than one GPIO chip in the system, the numbers basically depend
>> on probe order, and may theoretically even differ between two boots.
>>
>> So in these cases preserving the ABI means preserving the
>> unpredictability of these assigned numbers or something.
>>
>> For the old usecases with a single GPIO controller and a fixed
>> base offset of e.g. 0 (which I suspect was implicit in the initial
>> design of the subsystem) things work fine as always, it's these new
>> dynamic use cases that destabilize the ABI.
>
> Since GPIOs are exported through sysfs into userland by GPIO number,
> and we know that there are users of it (see
> https://github.com/pilight/wiringX) which hard encode GPIO numbers,
> so this is *really* something that we as kernel developers can't
> change without breaking such users.

I agree.

In some other thread I came up with the idea that if
we add enumerated aliases for the GPIO controllers in the
device tree (so that each can be assigned a sequence number,
like we do on the PL011 ttys) we can assign them numbers
starting from 0.

The only reason that dynamic GPIO start from some random
high offset is that the on-chip GPIOs are assumed to be present
at offset 0+, so this is done so that the dynamic controllers
avoid colliding with them. (At least that is how I understand it.)
So on a fully DT-enabled system assigning numbers starting
from 0 should be kind of default.

Yours,
Linus Walleij

[PATCH v5 1/3] gpio: Cygnus: define Broadcom Cygnus GPIO binding

[Linus Walleij]

On Tue, Jan 13, 2015 at 12:41 PM, Russell King - ARM Linux
<linux@arm.linux.org.uk> wrote:
> On Tue, Jan 13, 2015 at 09:06:15AM +0100, Linus Walleij wrote:
>> On Wed, Dec 17, 2014 at 11:44 AM, Russell King - ARM Linux
>> <linux@arm.linux.org.uk> wrote:
>> > On Wed, Dec 17, 2014 at 11:45:01AM +0900, Alexandre Courbot wrote:
>> >> Actually we are not that far from being able to do completely without
>> >> any GPIO number, and maybe that's what we should aim for. I think the
>> >> only remaining offender is the sysfs interface.
>> >
>> > And that is a user API, and there's lots of users of it (eg, on Raspberry
>> > Pi platforms.)  So changing it isn't going to be easy - I'd say that it's
>> > impractical.
>> >
>> > What you're suggesting would be like re-numbering Linux syscalls.
>>
>> The problem is that right now if we set the .base of a gpio_chip
>> to -1 for dynamic allocation of GPIO numbers and we have more
>> than one GPIO chip in the system, the numbers basically depend
>> on probe order, and may theoretically even differ between two boots.
>>
>> So in these cases preserving the ABI means preserving the
>> unpredictability of these assigned numbers or something.
>>
>> For the old usecases with a single GPIO controller and a fixed
>> base offset of e.g. 0 (which I suspect was implicit in the initial
>> design of the subsystem) things work fine as always, it's these new
>> dynamic use cases that destabilize the ABI.
>
> Since GPIOs are exported through sysfs into userland by GPIO number,
> and we know that there are users of it (see
> https://github.com/pilight/wiringX) which hard encode GPIO numbers,
> so this is *really* something that we as kernel developers can't
> change without breaking such users.

I agree.

In some other thread I came up with the idea that if
we add enumerated aliases for the GPIO controllers in the
device tree (so that each can be assigned a sequence number,
like we do on the PL011 ttys) we can assign them numbers
starting from 0.

The only reason that dynamic GPIO start from some random
high offset is that the on-chip GPIOs are assumed to be present
at offset 0+, so this is done so that the dynamic controllers
avoid colliding with them. (At least that is how I understand it.)
So on a fully DT-enabled system assigning numbers starting
from 0 should be kind of default.

Yours,
Linus Walleij

Re: [PATCH v4 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

On 1/15/2015 12:44 AM, Uwe Kleine-König wrote:
> Hello,
> 
> On Wed, Jan 14, 2015 at 02:23:33PM -0800, Ray Jui wrote:
>> Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
>> them disabled there. Individual I2C devices can be enabled in board
>> specific dts file when I2C slave devices are enabled in the future
> s/$/./
> 
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>> ---
>>  arch/arm/boot/dts/bcm-cygnus.dtsi |   20 ++++++++++++++++++++
>>  1 file changed, 20 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
>> index 5126f9e..f7d6c1d 100644
>> --- a/arch/arm/boot/dts/bcm-cygnus.dtsi
>> +++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
>> @@ -70,6 +70,26 @@
>>  		};
>>  	};
>>  
>> +	i2c0: i2c@18008000 {
>> +		compatible = "brcm,iproc-i2c";
> in patch 2 you wrote the driver is for a family of SoCs, right? Then I'd
> make this:
> 
> 	compatible = "brcm,$mysoc-iproc-i2c", "brcm,iproc-i2c";
> 
Sorry could you please help to explain the intention here? Note the
iProc I2C IP can be found in various iProc family of SoCs, but to my
best knowledge, there hasn't been any changes of the IP in any of those
SoCs.

Is the compatible ID "brcm,$mysoc-iproc-i2c" only to clarify that it's
for a specific SoC? If so, what should the compatible ID array look
like? Should it be changed to the following?

static const struct of_device_id bcm_iproc_i2c_of_match[] = {
	{ .compatible = "brcm,iproc-i2c" },
	{ .compatible = "brcm,$mysoc-iproc-i2c" },
	{},
};


> (or maybe s/$mysoc-iproc-i2c/$mysoc-i2c/).
> 
> Best regards
> Uwe
> 

Re: [PATCH v4 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

On 1/15/2015 12:44 AM, Uwe Kleine-König wrote:
> Hello,
> 
> On Wed, Jan 14, 2015 at 02:23:33PM -0800, Ray Jui wrote:
>> Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
>> them disabled there. Individual I2C devices can be enabled in board
>> specific dts file when I2C slave devices are enabled in the future
> s/$/./
> 
>>
>> Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>> Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>> ---
>>  arch/arm/boot/dts/bcm-cygnus.dtsi |   20 ++++++++++++++++++++
>>  1 file changed, 20 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
>> index 5126f9e..f7d6c1d 100644
>> --- a/arch/arm/boot/dts/bcm-cygnus.dtsi
>> +++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
>> @@ -70,6 +70,26 @@
>>  		};
>>  	};
>>  
>> +	i2c0: i2c@18008000 {
>> +		compatible = "brcm,iproc-i2c";
> in patch 2 you wrote the driver is for a family of SoCs, right? Then I'd
> make this:
> 
> 	compatible = "brcm,$mysoc-iproc-i2c", "brcm,iproc-i2c";
> 
Sorry could you please help to explain the intention here? Note the
iProc I2C IP can be found in various iProc family of SoCs, but to my
best knowledge, there hasn't been any changes of the IP in any of those
SoCs.

Is the compatible ID "brcm,$mysoc-iproc-i2c" only to clarify that it's
for a specific SoC? If so, what should the compatible ID array look
like? Should it be changed to the following?

static const struct of_device_id bcm_iproc_i2c_of_match[] = {
	{ .compatible = "brcm,iproc-i2c" },
	{ .compatible = "brcm,$mysoc-iproc-i2c" },
	{},
};


> (or maybe s/$mysoc-iproc-i2c/$mysoc-i2c/).
> 
> Best regards
> Uwe
> 

[PATCH v4 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

On 1/15/2015 12:44 AM, Uwe Kleine-K?nig wrote:
> Hello,
> 
> On Wed, Jan 14, 2015 at 02:23:33PM -0800, Ray Jui wrote:
>> Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
>> them disabled there. Individual I2C devices can be enabled in board
>> specific dts file when I2C slave devices are enabled in the future
> s/$/./
> 
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>> ---
>>  arch/arm/boot/dts/bcm-cygnus.dtsi |   20 ++++++++++++++++++++
>>  1 file changed, 20 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
>> index 5126f9e..f7d6c1d 100644
>> --- a/arch/arm/boot/dts/bcm-cygnus.dtsi
>> +++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
>> @@ -70,6 +70,26 @@
>>  		};
>>  	};
>>  
>> +	i2c0: i2c at 18008000 {
>> +		compatible = "brcm,iproc-i2c";
> in patch 2 you wrote the driver is for a family of SoCs, right? Then I'd
> make this:
> 
> 	compatible = "brcm,$mysoc-iproc-i2c", "brcm,iproc-i2c";
> 
Sorry could you please help to explain the intention here? Note the
iProc I2C IP can be found in various iProc family of SoCs, but to my
best knowledge, there hasn't been any changes of the IP in any of those
SoCs.

Is the compatible ID "brcm,$mysoc-iproc-i2c" only to clarify that it's
for a specific SoC? If so, what should the compatible ID array look
like? Should it be changed to the following?

static const struct of_device_id bcm_iproc_i2c_of_match[] = {
	{ .compatible = "brcm,iproc-i2c" },
	{ .compatible = "brcm,$mysoc-iproc-i2c" },
	{},
};


> (or maybe s/$mysoc-iproc-i2c/$mysoc-i2c/).
> 
> Best regards
> Uwe
> 

Re: [PATCH v4 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Uwe Kleine-König]

Hello,

On Fri, Jan 16, 2015 at 11:24:09AM -0800, Ray Jui wrote:
> >> +	i2c0: i2c@18008000 {
> >> +		compatible = "brcm,iproc-i2c";
> > in patch 2 you wrote the driver is for a family of SoCs, right? Then I'd
> > make this:
> > 
> > 	compatible = "brcm,$mysoc-iproc-i2c", "brcm,iproc-i2c";
> > 
> Sorry could you please help to explain the intention here? Note the
> iProc I2C IP can be found in various iProc family of SoCs, but to my
> best knowledge, there hasn't been any changes of the IP in any of those
> SoCs.
This is just for making the device tree stable in the future. Consider
your gentle hardware engineers "fix" a small issue for the next
generation iproc SoC "pony" that needs an incompatible software change.

Then you can fix the driver without updating the device trees by
switching to the SoC specific compatible string for "pony". And in case
the hardware engineers didn't tell you that there is a change and the
need for the software change is only detected when the machines are
already shipped, you're happy if you can fix your kernel without needing
to change the bootloader that provides the dtb.
So start already today to add the (for now unused) compatible string.

> Is the compatible ID "brcm,$mysoc-iproc-i2c" only to clarify that it's
> for a specific SoC? If so, what should the compatible ID array look
> like? Should it be changed to the following?
> 
> static const struct of_device_id bcm_iproc_i2c_of_match[] = {
> 	{ .compatible = "brcm,iproc-i2c" },
> 	{ .compatible = "brcm,$mysoc-iproc-i2c" },
> 	{},
> };
No, there is no need, see above.

If something is still unclear, don't hesitate to ask.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

Re: [PATCH v4 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Uwe Kleine-König]

Hello,

On Fri, Jan 16, 2015 at 11:24:09AM -0800, Ray Jui wrote:
> >> +	i2c0: i2c@18008000 {
> >> +		compatible = "brcm,iproc-i2c";
> > in patch 2 you wrote the driver is for a family of SoCs, right? Then I'd
> > make this:
> > 
> > 	compatible = "brcm,$mysoc-iproc-i2c", "brcm,iproc-i2c";
> > 
> Sorry could you please help to explain the intention here? Note the
> iProc I2C IP can be found in various iProc family of SoCs, but to my
> best knowledge, there hasn't been any changes of the IP in any of those
> SoCs.
This is just for making the device tree stable in the future. Consider
your gentle hardware engineers "fix" a small issue for the next
generation iproc SoC "pony" that needs an incompatible software change.

Then you can fix the driver without updating the device trees by
switching to the SoC specific compatible string for "pony". And in case
the hardware engineers didn't tell you that there is a change and the
need for the software change is only detected when the machines are
already shipped, you're happy if you can fix your kernel without needing
to change the bootloader that provides the dtb.
So start already today to add the (for now unused) compatible string.

> Is the compatible ID "brcm,$mysoc-iproc-i2c" only to clarify that it's
> for a specific SoC? If so, what should the compatible ID array look
> like? Should it be changed to the following?
> 
> static const struct of_device_id bcm_iproc_i2c_of_match[] = {
> 	{ .compatible = "brcm,iproc-i2c" },
> 	{ .compatible = "brcm,$mysoc-iproc-i2c" },
> 	{},
> };
No, there is no need, see above.

If something is still unclear, don't hesitate to ask.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

[PATCH v4 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Uwe Kleine-König]

Hello,

On Fri, Jan 16, 2015 at 11:24:09AM -0800, Ray Jui wrote:
> >> +	i2c0: i2c at 18008000 {
> >> +		compatible = "brcm,iproc-i2c";
> > in patch 2 you wrote the driver is for a family of SoCs, right? Then I'd
> > make this:
> > 
> > 	compatible = "brcm,$mysoc-iproc-i2c", "brcm,iproc-i2c";
> > 
> Sorry could you please help to explain the intention here? Note the
> iProc I2C IP can be found in various iProc family of SoCs, but to my
> best knowledge, there hasn't been any changes of the IP in any of those
> SoCs.
This is just for making the device tree stable in the future. Consider
your gentle hardware engineers "fix" a small issue for the next
generation iproc SoC "pony" that needs an incompatible software change.

Then you can fix the driver without updating the device trees by
switching to the SoC specific compatible string for "pony". And in case
the hardware engineers didn't tell you that there is a change and the
need for the software change is only detected when the machines are
already shipped, you're happy if you can fix your kernel without needing
to change the bootloader that provides the dtb.
So start already today to add the (for now unused) compatible string.

> Is the compatible ID "brcm,$mysoc-iproc-i2c" only to clarify that it's
> for a specific SoC? If so, what should the compatible ID array look
> like? Should it be changed to the following?
> 
> static const struct of_device_id bcm_iproc_i2c_of_match[] = {
> 	{ .compatible = "brcm,iproc-i2c" },
> 	{ .compatible = "brcm,$mysoc-iproc-i2c" },
> 	{},
> };
No, there is no need, see above.

If something is still unclear, don't hesitate to ask.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-K?nig            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

Re: [PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/15/2015 12:41 AM, Uwe Kleine-König wrote:
> Hello,
> 
> On Wed, Jan 14, 2015 at 02:23:32PM -0800, Ray Jui wrote:
>> +#include <linux/device.h>
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/sched.h>
>> +#include <linux/i2c.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/clk.h>
>> +#include <linux/io.h>
>> +#include <linux/slab.h>
>> +#include <linux/delay.h>
> some of them are not needed. I tested on amd64 and efm32 and could drop
> linux/device.h, linux/sched.h, linux/clk.h. (BTW, I wonder that you
> don't need clk handling.)
Thanks. Will delete redundant header includes. I haven't found any
clocks in Cygnus clock data sheet that are labeled i2c. I suspect the
I2C clock is derived directly from the crystal and therefore we have no
gating control. As you can see, the rates of 100K and 400K are set
directly in the I2C block internal registers. That implies the I2C core
clock is fixed.

> 
>> +#define TIM_CFG_OFFSET               0x04
>> +#define TIME_CFG_MODE_400_SHIFT      31
> Is the register name and the bit name prefix really different or is this
> a typo?
> 
Yeah, typo. Will fix.

>> +static int __wait_for_bus_idle(struct bcm_iproc_i2c_dev *iproc_i2c)
> A bcm_iproc_i2c prefix would be nice here.
> 
>> +static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *iproc_i2c,
>> +				     struct i2c_msg *msg, u8 *addr)
>> +{
>> +
>> +	if (msg->flags & I2C_M_TEN) {
>> +		dev_err(iproc_i2c->device, "no support for 10-bit address\n");
>> +		return -EINVAL;
>> +	}
>> +
>> +	*addr = (msg->addr << 1);
> You can also drop the parentheses.
> 
Yes

>> +	switch (val) {
>> +	case M_CMD_STATUS_SUCCESS:
>> +		return 0;
>> +
>> +	case M_CMD_STATUS_LOST_ARB:
>> +		dev_err(iproc_i2c->device, "lost bus arbitration\n");
>> +		return -EREMOTEIO;
>> +
>> +	case M_CMD_STATUS_NACK_ADDR:
>> +		dev_err(iproc_i2c->device, "NAK addr:0x%02x\n",
>> +			iproc_i2c->msg->addr);
>> +		return -EREMOTEIO;
>> +
>> +	case M_CMD_STATUS_NACK_DATA:
>> +		dev_err(iproc_i2c->device, "NAK data\n");
>> +		return -EREMOTEIO;
>> +
>> +	case M_CMD_STATUS_TIMEOUT:
>> +		dev_err(iproc_i2c->device, "bus timeout\n");
>> +		return -ETIMEDOUT;
>> +
>> +	default:
>> +		dev_err(iproc_i2c->device, "unknown error code=%d\n", val);
>> +		return -EREMOTEIO;
>> +	}
>> +
>> +	return -EREMOTEIO;
> This is not reached.
> 
Will delete.

>> +}
>> +
>> +static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *iproc_i2c,
>> +					 struct i2c_msg *msg)
>> +{
>> +	int ret, i;
>> +	u8 addr;
>> +	u32 val;
>> +	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
>> +
>> +	if (msg->len < 1 || msg->len > M_TX_RX_FIFO_SIZE - 1) {
> Is the < 1 a hardware or a software limitation? That means your driver
> doesn't support I2C_SMBUS_QUICK which is used for example by i2cdetect.
> 
Actually a SW issue. Will fix.

>> +		dev_err(iproc_i2c->device,
>> +			"supported data length is 1 - %u bytes\n",
>> +			M_TX_RX_FIFO_SIZE - 1);
>> +		return -EINVAL;
>> +	}
>> +
>> +	iproc_i2c->msg = msg;
> Can it happen that iproc_i2c->msg still holds an uncompleted message
> here or is this serialized by the core? Wolfram? Either here something
> like:
> 
> 	if (iproc_i2c->msg)
> 		return -EBUSY;
> 
> and
> 
> 	iproc_i2c->msg = NULL;
> 
> when a transfer is completed is needed, or the respective code can be
> dropped from other drivers (e.g. i2c-efm32).
> On the other hand .msg is only used in bcm_iproc_i2c_check_status() to
> give a diagnostic message. Maybe you can drop .msg and instead give it
> as an additional parameter to bcm_iproc_i2c_check_status().
> 
Yes, I'll drop .msg in iproc_i2c.

>> +	ret = __wait_for_bus_idle(iproc_i2c);
>> +	if (ret)
>> +		return ret;
> I would still prefer to have something like:
> 
> 	if (bcm_iproc_i2c_bus_busy())
> 		return -EBUSY;
> 
> instead of a tight loop here.
> 
Okay. Will do.

>> +	ret = bcm_iproc_i2c_format_addr(iproc_i2c, msg, &addr);
>> +	if (ret)
>> +		return ret;
>> +
>> +	/* load slave address into the TX FIFO */
>> +	writel(addr, iproc_i2c->base + M_TX_OFFSET);
>> +
>> +	/* for a write transaction, load data into the TX FIFO */
>> +	if (!(msg->flags & I2C_M_RD)) {
>> +		for (i = 0; i < msg->len; i++) {
>> +			val = msg->buf[i];
>> +
>> +			/* mark the last byte */
>> +			if (i == msg->len - 1)
>> +				val |= 1 << M_TX_WR_STATUS_SHIFT;
> What happens if you don't mark this last byte? Could this be used to
> support transfers bigger than the fifo size?
> 
I do not think so. According to the iProc I2C block programming guide,
one always needs to mark the last byte in a write operation.

>> +	/*
>> +	 * Enable the "start busy" interrupt, which will be triggered after
>> +	 * the transaction is done, i.e., the internal start_busy bit
> s/\.,/./ I think
> 
>> +	 * transitions from 1 to 0
> s/$/./
Thanks.

>> +	 */
>> +	writel(1 << IE_M_START_BUSY_SHIFT, iproc_i2c->base + IE_OFFSET);
>> +
>> +	/*
>> +	 * Now we can activate the transfer. For a read operation, specify the
>> +	 * number of bytes to read
> s/$/./
> 
>> +	 */
>> +	val = 1 << M_CMD_START_BUSY_SHIFT;
>> +	if (msg->flags & I2C_M_RD) {
>> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
>> +		       (msg->len << M_CMD_RD_CNT_SHIFT);
>> +	} else {
>> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
>> +	}
>> +	writel(val, iproc_i2c->base + M_CMD_OFFSET);
>> +
>> +	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
> 
> When the interrupt fires here after the complete timed out and before
> you disable the irq you still throw the result away.
Yes, but then this comes down to the fact that if it has reached the
point that is determined to be a timeout condition in the driver, one
should really treat it as timeout error. In a normal condition,
time_left should never reach zero.

>> +
>> +	/* disable all interrupts */
>> +	writel(0, iproc_i2c->base + IE_OFFSET);
>> +
>> +	if (!time_left) {
>> +		dev_err(iproc_i2c->device, "transaction times out\n");
> s/times/timed/
> 
Thanks.

>> +static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
>> +{
>> +	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
> Note that I2C_FUNC_SMBUS_EMUL includes I2C_FUNC_SMBUS_QUICK, so your
> driver claims to support transfers of length 0.
> 
Yes. Fix the driver to support length 0 for slave address query.

>> +static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
>> +{
>> +	unsigned int bus_speed, speed_bit;
>> +	u32 val;
>> +	int ret = of_property_read_u32(iproc_i2c->device->of_node,
>> +				       "clock-frequency", &bus_speed);
>> +	if (ret < 0) {
>> +		dev_err(iproc_i2c->device,
>> +			"missing clock-frequency property\n");
>> +		return -ENODEV;
> Is a missing property the only situation where of_property_read_u32
> returns an error? Would it be sane to default to 100 kHz?
> 
Okay, agreed with you and Wolfram. Will default to 100 KHz.

>> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
>> +{
>> +	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
>> +
>> +	i2c_del_adapter(&iproc_i2c->adapter);
> You need to free the irq before i2c_del_adapter.
> 
Yes. Thanks. Change back to use devm_request_irq, and use disable_irq
here before removing the adapter.

>> +	free_irq(iproc_i2c->irq, iproc_i2c);
>> +	bcm_iproc_i2c_disable(iproc_i2c);
>> +
>> +	return 0;
>> +}
>> +
>> +static const struct of_device_id bcm_iproc_i2c_of_match[] = {
>> +	{.compatible = "brcm,iproc-i2c",},
> Not sure this is specified to be a must, but I'd add spaces after { and
> before }.
> 
Yes.

>> +	{},
> It's a good habit to write this as
> 
> 	{ /* sentinel */ }
> 
> without trailing comma.
Okay.

> 
> Best regards
> Uwe
> 
Thanks for the review!

Re: [PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/15/2015 12:41 AM, Uwe Kleine-König wrote:
> Hello,
> 
> On Wed, Jan 14, 2015 at 02:23:32PM -0800, Ray Jui wrote:
>> +#include <linux/device.h>
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/sched.h>
>> +#include <linux/i2c.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/clk.h>
>> +#include <linux/io.h>
>> +#include <linux/slab.h>
>> +#include <linux/delay.h>
> some of them are not needed. I tested on amd64 and efm32 and could drop
> linux/device.h, linux/sched.h, linux/clk.h. (BTW, I wonder that you
> don't need clk handling.)
Thanks. Will delete redundant header includes. I haven't found any
clocks in Cygnus clock data sheet that are labeled i2c. I suspect the
I2C clock is derived directly from the crystal and therefore we have no
gating control. As you can see, the rates of 100K and 400K are set
directly in the I2C block internal registers. That implies the I2C core
clock is fixed.

> 
>> +#define TIM_CFG_OFFSET               0x04
>> +#define TIME_CFG_MODE_400_SHIFT      31
> Is the register name and the bit name prefix really different or is this
> a typo?
> 
Yeah, typo. Will fix.

>> +static int __wait_for_bus_idle(struct bcm_iproc_i2c_dev *iproc_i2c)
> A bcm_iproc_i2c prefix would be nice here.
> 
>> +static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *iproc_i2c,
>> +				     struct i2c_msg *msg, u8 *addr)
>> +{
>> +
>> +	if (msg->flags & I2C_M_TEN) {
>> +		dev_err(iproc_i2c->device, "no support for 10-bit address\n");
>> +		return -EINVAL;
>> +	}
>> +
>> +	*addr = (msg->addr << 1);
> You can also drop the parentheses.
> 
Yes

>> +	switch (val) {
>> +	case M_CMD_STATUS_SUCCESS:
>> +		return 0;
>> +
>> +	case M_CMD_STATUS_LOST_ARB:
>> +		dev_err(iproc_i2c->device, "lost bus arbitration\n");
>> +		return -EREMOTEIO;
>> +
>> +	case M_CMD_STATUS_NACK_ADDR:
>> +		dev_err(iproc_i2c->device, "NAK addr:0x%02x\n",
>> +			iproc_i2c->msg->addr);
>> +		return -EREMOTEIO;
>> +
>> +	case M_CMD_STATUS_NACK_DATA:
>> +		dev_err(iproc_i2c->device, "NAK data\n");
>> +		return -EREMOTEIO;
>> +
>> +	case M_CMD_STATUS_TIMEOUT:
>> +		dev_err(iproc_i2c->device, "bus timeout\n");
>> +		return -ETIMEDOUT;
>> +
>> +	default:
>> +		dev_err(iproc_i2c->device, "unknown error code=%d\n", val);
>> +		return -EREMOTEIO;
>> +	}
>> +
>> +	return -EREMOTEIO;
> This is not reached.
> 
Will delete.

>> +}
>> +
>> +static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *iproc_i2c,
>> +					 struct i2c_msg *msg)
>> +{
>> +	int ret, i;
>> +	u8 addr;
>> +	u32 val;
>> +	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
>> +
>> +	if (msg->len < 1 || msg->len > M_TX_RX_FIFO_SIZE - 1) {
> Is the < 1 a hardware or a software limitation? That means your driver
> doesn't support I2C_SMBUS_QUICK which is used for example by i2cdetect.
> 
Actually a SW issue. Will fix.

>> +		dev_err(iproc_i2c->device,
>> +			"supported data length is 1 - %u bytes\n",
>> +			M_TX_RX_FIFO_SIZE - 1);
>> +		return -EINVAL;
>> +	}
>> +
>> +	iproc_i2c->msg = msg;
> Can it happen that iproc_i2c->msg still holds an uncompleted message
> here or is this serialized by the core? Wolfram? Either here something
> like:
> 
> 	if (iproc_i2c->msg)
> 		return -EBUSY;
> 
> and
> 
> 	iproc_i2c->msg = NULL;
> 
> when a transfer is completed is needed, or the respective code can be
> dropped from other drivers (e.g. i2c-efm32).
> On the other hand .msg is only used in bcm_iproc_i2c_check_status() to
> give a diagnostic message. Maybe you can drop .msg and instead give it
> as an additional parameter to bcm_iproc_i2c_check_status().
> 
Yes, I'll drop .msg in iproc_i2c.

>> +	ret = __wait_for_bus_idle(iproc_i2c);
>> +	if (ret)
>> +		return ret;
> I would still prefer to have something like:
> 
> 	if (bcm_iproc_i2c_bus_busy())
> 		return -EBUSY;
> 
> instead of a tight loop here.
> 
Okay. Will do.

>> +	ret = bcm_iproc_i2c_format_addr(iproc_i2c, msg, &addr);
>> +	if (ret)
>> +		return ret;
>> +
>> +	/* load slave address into the TX FIFO */
>> +	writel(addr, iproc_i2c->base + M_TX_OFFSET);
>> +
>> +	/* for a write transaction, load data into the TX FIFO */
>> +	if (!(msg->flags & I2C_M_RD)) {
>> +		for (i = 0; i < msg->len; i++) {
>> +			val = msg->buf[i];
>> +
>> +			/* mark the last byte */
>> +			if (i == msg->len - 1)
>> +				val |= 1 << M_TX_WR_STATUS_SHIFT;
> What happens if you don't mark this last byte? Could this be used to
> support transfers bigger than the fifo size?
> 
I do not think so. According to the iProc I2C block programming guide,
one always needs to mark the last byte in a write operation.

>> +	/*
>> +	 * Enable the "start busy" interrupt, which will be triggered after
>> +	 * the transaction is done, i.e., the internal start_busy bit
> s/\.,/./ I think
> 
>> +	 * transitions from 1 to 0
> s/$/./
Thanks.

>> +	 */
>> +	writel(1 << IE_M_START_BUSY_SHIFT, iproc_i2c->base + IE_OFFSET);
>> +
>> +	/*
>> +	 * Now we can activate the transfer. For a read operation, specify the
>> +	 * number of bytes to read
> s/$/./
> 
>> +	 */
>> +	val = 1 << M_CMD_START_BUSY_SHIFT;
>> +	if (msg->flags & I2C_M_RD) {
>> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
>> +		       (msg->len << M_CMD_RD_CNT_SHIFT);
>> +	} else {
>> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
>> +	}
>> +	writel(val, iproc_i2c->base + M_CMD_OFFSET);
>> +
>> +	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
> 
> When the interrupt fires here after the complete timed out and before
> you disable the irq you still throw the result away.
Yes, but then this comes down to the fact that if it has reached the
point that is determined to be a timeout condition in the driver, one
should really treat it as timeout error. In a normal condition,
time_left should never reach zero.

>> +
>> +	/* disable all interrupts */
>> +	writel(0, iproc_i2c->base + IE_OFFSET);
>> +
>> +	if (!time_left) {
>> +		dev_err(iproc_i2c->device, "transaction times out\n");
> s/times/timed/
> 
Thanks.

>> +static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
>> +{
>> +	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
> Note that I2C_FUNC_SMBUS_EMUL includes I2C_FUNC_SMBUS_QUICK, so your
> driver claims to support transfers of length 0.
> 
Yes. Fix the driver to support length 0 for slave address query.

>> +static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
>> +{
>> +	unsigned int bus_speed, speed_bit;
>> +	u32 val;
>> +	int ret = of_property_read_u32(iproc_i2c->device->of_node,
>> +				       "clock-frequency", &bus_speed);
>> +	if (ret < 0) {
>> +		dev_err(iproc_i2c->device,
>> +			"missing clock-frequency property\n");
>> +		return -ENODEV;
> Is a missing property the only situation where of_property_read_u32
> returns an error? Would it be sane to default to 100 kHz?
> 
Okay, agreed with you and Wolfram. Will default to 100 KHz.

>> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
>> +{
>> +	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
>> +
>> +	i2c_del_adapter(&iproc_i2c->adapter);
> You need to free the irq before i2c_del_adapter.
> 
Yes. Thanks. Change back to use devm_request_irq, and use disable_irq
here before removing the adapter.

>> +	free_irq(iproc_i2c->irq, iproc_i2c);
>> +	bcm_iproc_i2c_disable(iproc_i2c);
>> +
>> +	return 0;
>> +}
>> +
>> +static const struct of_device_id bcm_iproc_i2c_of_match[] = {
>> +	{.compatible = "brcm,iproc-i2c",},
> Not sure this is specified to be a must, but I'd add spaces after { and
> before }.
> 
Yes.

>> +	{},
> It's a good habit to write this as
> 
> 	{ /* sentinel */ }
> 
> without trailing comma.
Okay.

> 
> Best regards
> Uwe
> 
Thanks for the review!

[PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/15/2015 12:41 AM, Uwe Kleine-K?nig wrote:
> Hello,
> 
> On Wed, Jan 14, 2015 at 02:23:32PM -0800, Ray Jui wrote:
>> +#include <linux/device.h>
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/sched.h>
>> +#include <linux/i2c.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/clk.h>
>> +#include <linux/io.h>
>> +#include <linux/slab.h>
>> +#include <linux/delay.h>
> some of them are not needed. I tested on amd64 and efm32 and could drop
> linux/device.h, linux/sched.h, linux/clk.h. (BTW, I wonder that you
> don't need clk handling.)
Thanks. Will delete redundant header includes. I haven't found any
clocks in Cygnus clock data sheet that are labeled i2c. I suspect the
I2C clock is derived directly from the crystal and therefore we have no
gating control. As you can see, the rates of 100K and 400K are set
directly in the I2C block internal registers. That implies the I2C core
clock is fixed.

> 
>> +#define TIM_CFG_OFFSET               0x04
>> +#define TIME_CFG_MODE_400_SHIFT      31
> Is the register name and the bit name prefix really different or is this
> a typo?
> 
Yeah, typo. Will fix.

>> +static int __wait_for_bus_idle(struct bcm_iproc_i2c_dev *iproc_i2c)
> A bcm_iproc_i2c prefix would be nice here.
> 
>> +static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *iproc_i2c,
>> +				     struct i2c_msg *msg, u8 *addr)
>> +{
>> +
>> +	if (msg->flags & I2C_M_TEN) {
>> +		dev_err(iproc_i2c->device, "no support for 10-bit address\n");
>> +		return -EINVAL;
>> +	}
>> +
>> +	*addr = (msg->addr << 1);
> You can also drop the parentheses.
> 
Yes

>> +	switch (val) {
>> +	case M_CMD_STATUS_SUCCESS:
>> +		return 0;
>> +
>> +	case M_CMD_STATUS_LOST_ARB:
>> +		dev_err(iproc_i2c->device, "lost bus arbitration\n");
>> +		return -EREMOTEIO;
>> +
>> +	case M_CMD_STATUS_NACK_ADDR:
>> +		dev_err(iproc_i2c->device, "NAK addr:0x%02x\n",
>> +			iproc_i2c->msg->addr);
>> +		return -EREMOTEIO;
>> +
>> +	case M_CMD_STATUS_NACK_DATA:
>> +		dev_err(iproc_i2c->device, "NAK data\n");
>> +		return -EREMOTEIO;
>> +
>> +	case M_CMD_STATUS_TIMEOUT:
>> +		dev_err(iproc_i2c->device, "bus timeout\n");
>> +		return -ETIMEDOUT;
>> +
>> +	default:
>> +		dev_err(iproc_i2c->device, "unknown error code=%d\n", val);
>> +		return -EREMOTEIO;
>> +	}
>> +
>> +	return -EREMOTEIO;
> This is not reached.
> 
Will delete.

>> +}
>> +
>> +static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *iproc_i2c,
>> +					 struct i2c_msg *msg)
>> +{
>> +	int ret, i;
>> +	u8 addr;
>> +	u32 val;
>> +	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
>> +
>> +	if (msg->len < 1 || msg->len > M_TX_RX_FIFO_SIZE - 1) {
> Is the < 1 a hardware or a software limitation? That means your driver
> doesn't support I2C_SMBUS_QUICK which is used for example by i2cdetect.
> 
Actually a SW issue. Will fix.

>> +		dev_err(iproc_i2c->device,
>> +			"supported data length is 1 - %u bytes\n",
>> +			M_TX_RX_FIFO_SIZE - 1);
>> +		return -EINVAL;
>> +	}
>> +
>> +	iproc_i2c->msg = msg;
> Can it happen that iproc_i2c->msg still holds an uncompleted message
> here or is this serialized by the core? Wolfram? Either here something
> like:
> 
> 	if (iproc_i2c->msg)
> 		return -EBUSY;
> 
> and
> 
> 	iproc_i2c->msg = NULL;
> 
> when a transfer is completed is needed, or the respective code can be
> dropped from other drivers (e.g. i2c-efm32).
> On the other hand .msg is only used in bcm_iproc_i2c_check_status() to
> give a diagnostic message. Maybe you can drop .msg and instead give it
> as an additional parameter to bcm_iproc_i2c_check_status().
> 
Yes, I'll drop .msg in iproc_i2c.

>> +	ret = __wait_for_bus_idle(iproc_i2c);
>> +	if (ret)
>> +		return ret;
> I would still prefer to have something like:
> 
> 	if (bcm_iproc_i2c_bus_busy())
> 		return -EBUSY;
> 
> instead of a tight loop here.
> 
Okay. Will do.

>> +	ret = bcm_iproc_i2c_format_addr(iproc_i2c, msg, &addr);
>> +	if (ret)
>> +		return ret;
>> +
>> +	/* load slave address into the TX FIFO */
>> +	writel(addr, iproc_i2c->base + M_TX_OFFSET);
>> +
>> +	/* for a write transaction, load data into the TX FIFO */
>> +	if (!(msg->flags & I2C_M_RD)) {
>> +		for (i = 0; i < msg->len; i++) {
>> +			val = msg->buf[i];
>> +
>> +			/* mark the last byte */
>> +			if (i == msg->len - 1)
>> +				val |= 1 << M_TX_WR_STATUS_SHIFT;
> What happens if you don't mark this last byte? Could this be used to
> support transfers bigger than the fifo size?
> 
I do not think so. According to the iProc I2C block programming guide,
one always needs to mark the last byte in a write operation.

>> +	/*
>> +	 * Enable the "start busy" interrupt, which will be triggered after
>> +	 * the transaction is done, i.e., the internal start_busy bit
> s/\.,/./ I think
> 
>> +	 * transitions from 1 to 0
> s/$/./
Thanks.

>> +	 */
>> +	writel(1 << IE_M_START_BUSY_SHIFT, iproc_i2c->base + IE_OFFSET);
>> +
>> +	/*
>> +	 * Now we can activate the transfer. For a read operation, specify the
>> +	 * number of bytes to read
> s/$/./
> 
>> +	 */
>> +	val = 1 << M_CMD_START_BUSY_SHIFT;
>> +	if (msg->flags & I2C_M_RD) {
>> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
>> +		       (msg->len << M_CMD_RD_CNT_SHIFT);
>> +	} else {
>> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
>> +	}
>> +	writel(val, iproc_i2c->base + M_CMD_OFFSET);
>> +
>> +	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
> 
> When the interrupt fires here after the complete timed out and before
> you disable the irq you still throw the result away.
Yes, but then this comes down to the fact that if it has reached the
point that is determined to be a timeout condition in the driver, one
should really treat it as timeout error. In a normal condition,
time_left should never reach zero.

>> +
>> +	/* disable all interrupts */
>> +	writel(0, iproc_i2c->base + IE_OFFSET);
>> +
>> +	if (!time_left) {
>> +		dev_err(iproc_i2c->device, "transaction times out\n");
> s/times/timed/
> 
Thanks.

>> +static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
>> +{
>> +	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
> Note that I2C_FUNC_SMBUS_EMUL includes I2C_FUNC_SMBUS_QUICK, so your
> driver claims to support transfers of length 0.
> 
Yes. Fix the driver to support length 0 for slave address query.

>> +static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
>> +{
>> +	unsigned int bus_speed, speed_bit;
>> +	u32 val;
>> +	int ret = of_property_read_u32(iproc_i2c->device->of_node,
>> +				       "clock-frequency", &bus_speed);
>> +	if (ret < 0) {
>> +		dev_err(iproc_i2c->device,
>> +			"missing clock-frequency property\n");
>> +		return -ENODEV;
> Is a missing property the only situation where of_property_read_u32
> returns an error? Would it be sane to default to 100 kHz?
> 
Okay, agreed with you and Wolfram. Will default to 100 KHz.

>> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
>> +{
>> +	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
>> +
>> +	i2c_del_adapter(&iproc_i2c->adapter);
> You need to free the irq before i2c_del_adapter.
> 
Yes. Thanks. Change back to use devm_request_irq, and use disable_irq
here before removing the adapter.

>> +	free_irq(iproc_i2c->irq, iproc_i2c);
>> +	bcm_iproc_i2c_disable(iproc_i2c);
>> +
>> +	return 0;
>> +}
>> +
>> +static const struct of_device_id bcm_iproc_i2c_of_match[] = {
>> +	{.compatible = "brcm,iproc-i2c",},
> Not sure this is specified to be a must, but I'd add spaces after { and
> before }.
> 
Yes.

>> +	{},
> It's a good habit to write this as
> 
> 	{ /* sentinel */ }
> 
> without trailing comma.
Okay.

> 
> Best regards
> Uwe
> 
Thanks for the review!

Re: [PATCH v3 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/15/2015 3:59 AM, Wolfram Sang wrote:
>>>> +	case M_CMD_STATUS_LOST_ARB:
>>>> +		dev_err(dev->device, "lost bus arbitration\n");
>>> I wouldn't dev_err that, only dev_dbg. I'm not sure how usual the errors
>>> for the next two cases is, maybe degrade them to dev_dbg, too?
>>>
>> These errors are rare, and it's nice to keep them at the dev_err level
>> so the user will be more aware.
> 
> This is wrong. Arbitration lost and NACK is pretty standard stuff on an
> I2C bus. User doesn't need to know about it, it is just noise in the
> logs. Timeout is different, you can report that (although I should
> probably move such a message into the core). Please also use the proper
> errno codes defined in Documentation/i2c/fault-codes. They should be
> distinct enough to drop the messages.
> 
Okay will do.

>>
>>>> +		return -EREMOTEIO;
>>>> +
>>>> +	case M_CMD_STATUS_NACK_ADDR:
>>>> +		dev_err(dev->device, "NAK addr:0x%02x\n", dev->msg->addr);
>>>> +		return -EREMOTEIO;
>>>> +
>>>> +	case M_CMD_STATUS_NACK_DATA:
>>>> +		dev_err(dev->device, "NAK data\n");
>>>> +		return -EREMOTEIO;
>>>> +
>>>> +	case M_CMD_STATUS_TIMEOUT:
>>>> +		dev_err(dev->device, "bus timeout\n");
>>>> +		return -ETIMEDOUT;
>>>> +
>>>> +	default:
>>>> +		dev_err(dev->device, "unknown error code=%d\n", val);
>>>> +		return -EREMOTEIO;
>>>> +	}
>>>> +
>>>> +	return -EREMOTEIO;
>>>> +}

Re: [PATCH v3 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/15/2015 3:59 AM, Wolfram Sang wrote:
>>>> +	case M_CMD_STATUS_LOST_ARB:
>>>> +		dev_err(dev->device, "lost bus arbitration\n");
>>> I wouldn't dev_err that, only dev_dbg. I'm not sure how usual the errors
>>> for the next two cases is, maybe degrade them to dev_dbg, too?
>>>
>> These errors are rare, and it's nice to keep them at the dev_err level
>> so the user will be more aware.
> 
> This is wrong. Arbitration lost and NACK is pretty standard stuff on an
> I2C bus. User doesn't need to know about it, it is just noise in the
> logs. Timeout is different, you can report that (although I should
> probably move such a message into the core). Please also use the proper
> errno codes defined in Documentation/i2c/fault-codes. They should be
> distinct enough to drop the messages.
> 
Okay will do.

>>
>>>> +		return -EREMOTEIO;
>>>> +
>>>> +	case M_CMD_STATUS_NACK_ADDR:
>>>> +		dev_err(dev->device, "NAK addr:0x%02x\n", dev->msg->addr);
>>>> +		return -EREMOTEIO;
>>>> +
>>>> +	case M_CMD_STATUS_NACK_DATA:
>>>> +		dev_err(dev->device, "NAK data\n");
>>>> +		return -EREMOTEIO;
>>>> +
>>>> +	case M_CMD_STATUS_TIMEOUT:
>>>> +		dev_err(dev->device, "bus timeout\n");
>>>> +		return -ETIMEDOUT;
>>>> +
>>>> +	default:
>>>> +		dev_err(dev->device, "unknown error code=%d\n", val);
>>>> +		return -EREMOTEIO;
>>>> +	}
>>>> +
>>>> +	return -EREMOTEIO;
>>>> +}

[PATCH v3 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/15/2015 3:59 AM, Wolfram Sang wrote:
>>>> +	case M_CMD_STATUS_LOST_ARB:
>>>> +		dev_err(dev->device, "lost bus arbitration\n");
>>> I wouldn't dev_err that, only dev_dbg. I'm not sure how usual the errors
>>> for the next two cases is, maybe degrade them to dev_dbg, too?
>>>
>> These errors are rare, and it's nice to keep them at the dev_err level
>> so the user will be more aware.
> 
> This is wrong. Arbitration lost and NACK is pretty standard stuff on an
> I2C bus. User doesn't need to know about it, it is just noise in the
> logs. Timeout is different, you can report that (although I should
> probably move such a message into the core). Please also use the proper
> errno codes defined in Documentation/i2c/fault-codes. They should be
> distinct enough to drop the messages.
> 
Okay will do.

>>
>>>> +		return -EREMOTEIO;
>>>> +
>>>> +	case M_CMD_STATUS_NACK_ADDR:
>>>> +		dev_err(dev->device, "NAK addr:0x%02x\n", dev->msg->addr);
>>>> +		return -EREMOTEIO;
>>>> +
>>>> +	case M_CMD_STATUS_NACK_DATA:
>>>> +		dev_err(dev->device, "NAK data\n");
>>>> +		return -EREMOTEIO;
>>>> +
>>>> +	case M_CMD_STATUS_TIMEOUT:
>>>> +		dev_err(dev->device, "bus timeout\n");
>>>> +		return -ETIMEDOUT;
>>>> +
>>>> +	default:
>>>> +		dev_err(dev->device, "unknown error code=%d\n", val);
>>>> +		return -EREMOTEIO;
>>>> +	}
>>>> +
>>>> +	return -EREMOTEIO;
>>>> +}

Re: [PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/15/2015 4:07 AM, Wolfram Sang wrote:
>>> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
>>> +{
>>> +	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
>>> +
>>> +	i2c_del_adapter(&iproc_i2c->adapter);
>> You need to free the irq before i2c_del_adapter.
> 
> One could also keep using devm_request_irq and disable all interrupts
> sources here?
> 
Okay this makes sense. Will use devm_request_irq and disable interrupt
in the remove function. Thanks.

> Thanks for the reviews, Uwe!
> 
>    Wolfram
> 

Re: [PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/15/2015 4:07 AM, Wolfram Sang wrote:
>>> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
>>> +{
>>> +	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
>>> +
>>> +	i2c_del_adapter(&iproc_i2c->adapter);
>> You need to free the irq before i2c_del_adapter.
> 
> One could also keep using devm_request_irq and disable all interrupts
> sources here?
> 
Okay this makes sense. Will use devm_request_irq and disable interrupt
in the remove function. Thanks.

> Thanks for the reviews, Uwe!
> 
>    Wolfram
> 

[PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/15/2015 4:07 AM, Wolfram Sang wrote:
>>> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
>>> +{
>>> +	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
>>> +
>>> +	i2c_del_adapter(&iproc_i2c->adapter);
>> You need to free the irq before i2c_del_adapter.
> 
> One could also keep using devm_request_irq and disable all interrupts
> sources here?
> 
Okay this makes sense. Will use devm_request_irq and disable interrupt
in the remove function. Thanks.

> Thanks for the reviews, Uwe!
> 
>    Wolfram
> 

Re: [PATCH v4 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

On 1/16/2015 11:48 AM, Uwe Kleine-König wrote:
> Hello,
> 
> On Fri, Jan 16, 2015 at 11:24:09AM -0800, Ray Jui wrote:
>>>> +	i2c0: i2c@18008000 {
>>>> +		compatible = "brcm,iproc-i2c";
>>> in patch 2 you wrote the driver is for a family of SoCs, right? Then I'd
>>> make this:
>>>
>>> 	compatible = "brcm,$mysoc-iproc-i2c", "brcm,iproc-i2c";
>>>
>> Sorry could you please help to explain the intention here? Note the
>> iProc I2C IP can be found in various iProc family of SoCs, but to my
>> best knowledge, there hasn't been any changes of the IP in any of those
>> SoCs.
> This is just for making the device tree stable in the future. Consider
> your gentle hardware engineers "fix" a small issue for the next
> generation iproc SoC "pony" that needs an incompatible software change.
> 
> Then you can fix the driver without updating the device trees by
> switching to the SoC specific compatible string for "pony". And in case
> the hardware engineers didn't tell you that there is a change and the
> need for the software change is only detected when the machines are
> already shipped, you're happy if you can fix your kernel without needing
> to change the bootloader that provides the dtb.
> So start already today to add the (for now unused) compatible string.
> 
>> Is the compatible ID "brcm,$mysoc-iproc-i2c" only to clarify that it's
>> for a specific SoC? If so, what should the compatible ID array look
>> like? Should it be changed to the following?
>>
>> static const struct of_device_id bcm_iproc_i2c_of_match[] = {
>> 	{ .compatible = "brcm,iproc-i2c" },
>> 	{ .compatible = "brcm,$mysoc-iproc-i2c" },
>> 	{},
>> };
> No, there is no need, see above.
> 
> If something is still unclear, don't hesitate to ask.
> 
> Best regards
> Uwe
> 
Okay got it. Thanks for the explanation!

Re: [PATCH v4 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

On 1/16/2015 11:48 AM, Uwe Kleine-König wrote:
> Hello,
> 
> On Fri, Jan 16, 2015 at 11:24:09AM -0800, Ray Jui wrote:
>>>> +	i2c0: i2c@18008000 {
>>>> +		compatible = "brcm,iproc-i2c";
>>> in patch 2 you wrote the driver is for a family of SoCs, right? Then I'd
>>> make this:
>>>
>>> 	compatible = "brcm,$mysoc-iproc-i2c", "brcm,iproc-i2c";
>>>
>> Sorry could you please help to explain the intention here? Note the
>> iProc I2C IP can be found in various iProc family of SoCs, but to my
>> best knowledge, there hasn't been any changes of the IP in any of those
>> SoCs.
> This is just for making the device tree stable in the future. Consider
> your gentle hardware engineers "fix" a small issue for the next
> generation iproc SoC "pony" that needs an incompatible software change.
> 
> Then you can fix the driver without updating the device trees by
> switching to the SoC specific compatible string for "pony". And in case
> the hardware engineers didn't tell you that there is a change and the
> need for the software change is only detected when the machines are
> already shipped, you're happy if you can fix your kernel without needing
> to change the bootloader that provides the dtb.
> So start already today to add the (for now unused) compatible string.
> 
>> Is the compatible ID "brcm,$mysoc-iproc-i2c" only to clarify that it's
>> for a specific SoC? If so, what should the compatible ID array look
>> like? Should it be changed to the following?
>>
>> static const struct of_device_id bcm_iproc_i2c_of_match[] = {
>> 	{ .compatible = "brcm,iproc-i2c" },
>> 	{ .compatible = "brcm,$mysoc-iproc-i2c" },
>> 	{},
>> };
> No, there is no need, see above.
> 
> If something is still unclear, don't hesitate to ask.
> 
> Best regards
> Uwe
> 
Okay got it. Thanks for the explanation!
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[PATCH v4 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

On 1/16/2015 11:48 AM, Uwe Kleine-K?nig wrote:
> Hello,
> 
> On Fri, Jan 16, 2015 at 11:24:09AM -0800, Ray Jui wrote:
>>>> +	i2c0: i2c at 18008000 {
>>>> +		compatible = "brcm,iproc-i2c";
>>> in patch 2 you wrote the driver is for a family of SoCs, right? Then I'd
>>> make this:
>>>
>>> 	compatible = "brcm,$mysoc-iproc-i2c", "brcm,iproc-i2c";
>>>
>> Sorry could you please help to explain the intention here? Note the
>> iProc I2C IP can be found in various iProc family of SoCs, but to my
>> best knowledge, there hasn't been any changes of the IP in any of those
>> SoCs.
> This is just for making the device tree stable in the future. Consider
> your gentle hardware engineers "fix" a small issue for the next
> generation iproc SoC "pony" that needs an incompatible software change.
> 
> Then you can fix the driver without updating the device trees by
> switching to the SoC specific compatible string for "pony". And in case
> the hardware engineers didn't tell you that there is a change and the
> need for the software change is only detected when the machines are
> already shipped, you're happy if you can fix your kernel without needing
> to change the bootloader that provides the dtb.
> So start already today to add the (for now unused) compatible string.
> 
>> Is the compatible ID "brcm,$mysoc-iproc-i2c" only to clarify that it's
>> for a specific SoC? If so, what should the compatible ID array look
>> like? Should it be changed to the following?
>>
>> static const struct of_device_id bcm_iproc_i2c_of_match[] = {
>> 	{ .compatible = "brcm,iproc-i2c" },
>> 	{ .compatible = "brcm,$mysoc-iproc-i2c" },
>> 	{},
>> };
> No, there is no need, see above.
> 
> If something is still unclear, don't hesitate to ask.
> 
> Best regards
> Uwe
> 
Okay got it. Thanks for the explanation!

[PATCH v5 0/3] Add I2C support to Broadcom iProc

[Ray Jui]

This patchset contains the initial I2C support for Broadcom iProc family of
SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has a
size of 64 bytes. The iProc I2C controller supports two bus speeds including
standard mode (100 kHz) and fast mode (400 kHz)

Changes from v4:
 - Remove redundant header file includes
 - Change the logic that waits for the host controller to be idle to
   simply return -EBUSY
 - Use proper print level and error codes in the driver
 - Allow zero length message in the driver to support I2C_SMBUS_QUICK
 - Change back to use devm_request_irq. Disable interrupt in the remove
   function so there's no outstanding I2C interrupt when the driver is
   being removed from the framework
 - Other minor miscellaneous improvements and fixes

Changes from v3:
 - Add config dependency to COMPILE_TEST to allow the driver to be build tested
   by other platforms
 - Improve CPU utilization efficiency in the loop of waiting for bus to idle
 - Add more comment in the driver to clarify the way how the "start busy"
   interrupt is triggered from the I2C controller
 - Fix inconsistent coding style and format
 - Improve the bus speed validation logic in the driver
 - Add code to free the interrupt line in driver's remove function. Also
   change to use non-devm API to request the interrupt line
 - Other miscellaneous improvements and fixes

Changes from v2:
 - Have the I2C driver default to y so it does not need to be selected from
   ARCH_BCM_IPROC. This also helps to get rid of one patch. The driver still
   depends on ARCH_BCM_IPROC
 - Get rid of redundant check on resource returned by platform_get_resource

Changes from v1:
 - Fix function argument parenthesis
 - Get rid of redundant driver owner field

Ray Jui (3):
  i2c: iProc: define Broadcom iProc I2C binding
  i2c: iproc: Add Broadcom iProc I2C Driver
  ARM: dts: add I2C device nodes for Broadcom Cygnus

 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   20 +
 drivers/i2c/busses/Kconfig                         |   10 +
 drivers/i2c/busses/Makefile                        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c                 |  493 ++++++++++++++++++++
 5 files changed, 561 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

-- 
1.7.9.5

[PATCH v5 0/3] Add I2C support to Broadcom iProc

[Ray Jui]

This patchset contains the initial I2C support for Broadcom iProc family of
SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has a
size of 64 bytes. The iProc I2C controller supports two bus speeds including
standard mode (100 kHz) and fast mode (400 kHz)

Changes from v4:
 - Remove redundant header file includes
 - Change the logic that waits for the host controller to be idle to
   simply return -EBUSY
 - Use proper print level and error codes in the driver
 - Allow zero length message in the driver to support I2C_SMBUS_QUICK
 - Change back to use devm_request_irq. Disable interrupt in the remove
   function so there's no outstanding I2C interrupt when the driver is
   being removed from the framework
 - Other minor miscellaneous improvements and fixes

Changes from v3:
 - Add config dependency to COMPILE_TEST to allow the driver to be build tested
   by other platforms
 - Improve CPU utilization efficiency in the loop of waiting for bus to idle
 - Add more comment in the driver to clarify the way how the "start busy"
   interrupt is triggered from the I2C controller
 - Fix inconsistent coding style and format
 - Improve the bus speed validation logic in the driver
 - Add code to free the interrupt line in driver's remove function. Also
   change to use non-devm API to request the interrupt line
 - Other miscellaneous improvements and fixes

Changes from v2:
 - Have the I2C driver default to y so it does not need to be selected from
   ARCH_BCM_IPROC. This also helps to get rid of one patch. The driver still
   depends on ARCH_BCM_IPROC
 - Get rid of redundant check on resource returned by platform_get_resource

Changes from v1:
 - Fix function argument parenthesis
 - Get rid of redundant driver owner field

Ray Jui (3):
  i2c: iProc: define Broadcom iProc I2C binding
  i2c: iproc: Add Broadcom iProc I2C Driver
  ARM: dts: add I2C device nodes for Broadcom Cygnus

 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   20 +
 drivers/i2c/busses/Kconfig                         |   10 +
 drivers/i2c/busses/Makefile                        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c                 |  493 ++++++++++++++++++++
 5 files changed, 561 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

-- 
1.7.9.5

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[PATCH v5 0/3] Add I2C support to Broadcom iProc

[Ray Jui]

This patchset contains the initial I2C support for Broadcom iProc family of
SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has a
size of 64 bytes. The iProc I2C controller supports two bus speeds including
standard mode (100 kHz) and fast mode (400 kHz)

Changes from v4:
 - Remove redundant header file includes
 - Change the logic that waits for the host controller to be idle to
   simply return -EBUSY
 - Use proper print level and error codes in the driver
 - Allow zero length message in the driver to support I2C_SMBUS_QUICK
 - Change back to use devm_request_irq. Disable interrupt in the remove
   function so there's no outstanding I2C interrupt when the driver is
   being removed from the framework
 - Other minor miscellaneous improvements and fixes

Changes from v3:
 - Add config dependency to COMPILE_TEST to allow the driver to be build tested
   by other platforms
 - Improve CPU utilization efficiency in the loop of waiting for bus to idle
 - Add more comment in the driver to clarify the way how the "start busy"
   interrupt is triggered from the I2C controller
 - Fix inconsistent coding style and format
 - Improve the bus speed validation logic in the driver
 - Add code to free the interrupt line in driver's remove function. Also
   change to use non-devm API to request the interrupt line
 - Other miscellaneous improvements and fixes

Changes from v2:
 - Have the I2C driver default to y so it does not need to be selected from
   ARCH_BCM_IPROC. This also helps to get rid of one patch. The driver still
   depends on ARCH_BCM_IPROC
 - Get rid of redundant check on resource returned by platform_get_resource

Changes from v1:
 - Fix function argument parenthesis
 - Get rid of redundant driver owner field

Ray Jui (3):
  i2c: iProc: define Broadcom iProc I2C binding
  i2c: iproc: Add Broadcom iProc I2C Driver
  ARM: dts: add I2C device nodes for Broadcom Cygnus

 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   20 +
 drivers/i2c/busses/Kconfig                         |   10 +
 drivers/i2c/busses/Makefile                        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c                 |  493 ++++++++++++++++++++
 5 files changed, 561 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

-- 
1.7.9.5

[PATCH v5 1/3] i2c: iProc: define Broadcom iProc I2C binding

[Ray Jui]

Document the I2C device tree binding for Broadcom iProc family of
SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt

diff --git a/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
new file mode 100644
index 0000000..81f982c
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
@@ -0,0 +1,37 @@
+Broadcom iProc I2C controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,iproc-i2c"
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+    I2C controller registers
+
+- interrupts:
+    Should contain the I2C interrupt
+
+- clock-frequency:
+    This is the I2C bus clock. Need to be either 100000 or 400000
+
+- #address-cells:
+    Always 1 (for I2C addresses)
+
+- #size-cells:
+    Always 0
+
+Example:
+	i2c0: i2c@18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+
+		codec: wm8750@1a {
+			compatible = "wlf,wm8750";
+			reg = <0x1a>;
+		};
+	};
-- 
1.7.9.5

[PATCH v5 1/3] i2c: iProc: define Broadcom iProc I2C binding

[Ray Jui]

Document the I2C device tree binding for Broadcom iProc family of
SoCs

Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
---
 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt

diff --git a/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
new file mode 100644
index 0000000..81f982c
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
@@ -0,0 +1,37 @@
+Broadcom iProc I2C controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,iproc-i2c"
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+    I2C controller registers
+
+- interrupts:
+    Should contain the I2C interrupt
+
+- clock-frequency:
+    This is the I2C bus clock. Need to be either 100000 or 400000
+
+- #address-cells:
+    Always 1 (for I2C addresses)
+
+- #size-cells:
+    Always 0
+
+Example:
+	i2c0: i2c@18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+
+		codec: wm8750@1a {
+			compatible = "wlf,wm8750";
+			reg = <0x1a>;
+		};
+	};
-- 
1.7.9.5

[PATCH v5 1/3] i2c: iProc: define Broadcom iProc I2C binding

[Ray Jui]

Document the I2C device tree binding for Broadcom iProc family of
SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt

diff --git a/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
new file mode 100644
index 0000000..81f982c
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
@@ -0,0 +1,37 @@
+Broadcom iProc I2C controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,iproc-i2c"
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+    I2C controller registers
+
+- interrupts:
+    Should contain the I2C interrupt
+
+- clock-frequency:
+    This is the I2C bus clock. Need to be either 100000 or 400000
+
+- #address-cells:
+    Always 1 (for I2C addresses)
+
+- #size-cells:
+    Always 0
+
+Example:
+	i2c0: i2c at 18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+
+		codec: wm8750 at 1a {
+			compatible = "wlf,wm8750";
+			reg = <0x1a>;
+		};
+	};
-- 
1.7.9.5

[PATCH v5 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

Add initial support to the Broadcom iProc I2C controller found in the
iProc family of SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has
a size of 64 bytes. The iProc I2C controller supports two bus speeds
including standard mode (100kHz) and fast mode (400kHz)

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/i2c/busses/Kconfig         |   10 +
 drivers/i2c/busses/Makefile        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c |  493 ++++++++++++++++++++++++++++++++++++
 3 files changed, 504 insertions(+)
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 31e8308..af76d23 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -372,6 +372,16 @@ config I2C_BCM2835
 	  This support is also available as a module.  If so, the module
 	  will be called i2c-bcm2835.
 
+config I2C_BCM_IPROC
+	tristate "Broadcom iProc I2C controller"
+	depends on ARCH_BCM_IPROC || COMPILE_TEST
+	default ARCH_BCM_IPROC
+	help
+	  If you say yes to this option, support will be included for the
+	  Broadcom iProc I2C controller.
+
+	  If you don't know what to do here, say N.
+
 config I2C_BCM_KONA
 	tristate "BCM Kona I2C adapter"
 	depends on ARCH_BCM_MOBILE
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 56388f6..d93b509 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
 obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
 obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
 obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
+obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
 obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
 obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
 obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
new file mode 100644
index 0000000..a92d8f5
--- /dev/null
+++ b/drivers/i2c/busses/i2c-bcm-iproc.c
@@ -0,0 +1,493 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+
+#define CFG_OFFSET                   0x00
+#define CFG_RESET_SHIFT              31
+#define CFG_EN_SHIFT                 30
+#define CFG_M_RETRY_CNT_SHIFT        16
+#define CFG_M_RETRY_CNT_MASK         0x0f
+
+#define TIM_CFG_OFFSET               0x04
+#define TIM_CFG_MODE_400_SHIFT       31
+
+#define M_FIFO_CTRL_OFFSET           0x0c
+#define M_FIFO_RX_FLUSH_SHIFT        31
+#define M_FIFO_TX_FLUSH_SHIFT        30
+#define M_FIFO_RX_CNT_SHIFT          16
+#define M_FIFO_RX_CNT_MASK           0x7f
+#define M_FIFO_RX_THLD_SHIFT         8
+#define M_FIFO_RX_THLD_MASK          0x3f
+
+#define M_CMD_OFFSET                 0x30
+#define M_CMD_START_BUSY_SHIFT       31
+#define M_CMD_STATUS_SHIFT           25
+#define M_CMD_STATUS_MASK            0x07
+#define M_CMD_STATUS_SUCCESS         0x0
+#define M_CMD_STATUS_LOST_ARB        0x1
+#define M_CMD_STATUS_NACK_ADDR       0x2
+#define M_CMD_STATUS_NACK_DATA       0x3
+#define M_CMD_STATUS_TIMEOUT         0x4
+#define M_CMD_PROTOCOL_SHIFT         9
+#define M_CMD_PROTOCOL_MASK          0xf
+#define M_CMD_PROTOCOL_BLK_WR        0x7
+#define M_CMD_PROTOCOL_BLK_RD        0x8
+#define M_CMD_PEC_SHIFT              8
+#define M_CMD_RD_CNT_SHIFT           0
+#define M_CMD_RD_CNT_MASK            0xff
+
+#define IE_OFFSET                    0x38
+#define IE_M_RX_FIFO_FULL_SHIFT      31
+#define IE_M_RX_THLD_SHIFT           30
+#define IE_M_START_BUSY_SHIFT        28
+
+#define IS_OFFSET                    0x3c
+#define IS_M_RX_FIFO_FULL_SHIFT      31
+#define IS_M_RX_THLD_SHIFT           30
+#define IS_M_START_BUSY_SHIFT        28
+
+#define M_TX_OFFSET                  0x40
+#define M_TX_WR_STATUS_SHIFT         31
+#define M_TX_DATA_SHIFT              0
+#define M_TX_DATA_MASK               0xff
+
+#define M_RX_OFFSET                  0x44
+#define M_RX_STATUS_SHIFT            30
+#define M_RX_STATUS_MASK             0x03
+#define M_RX_PEC_ERR_SHIFT           29
+#define M_RX_DATA_SHIFT              0
+#define M_RX_DATA_MASK               0xff
+
+#define I2C_TIMEOUT_MESC             100
+#define M_TX_RX_FIFO_SIZE            64
+
+enum bus_speed_index {
+	I2C_SPD_100K = 0,
+	I2C_SPD_400K,
+};
+
+struct bcm_iproc_i2c_dev {
+	struct device *device;
+	int irq;
+
+	void __iomem *base;
+
+	struct i2c_adapter adapter;
+
+	struct completion done;
+};
+
+/*
+ * Can be expanded in the future if more interrupt status bits are utilized
+ */
+#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
+
+static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = data;
+	u32 status = readl(iproc_i2c->base + IS_OFFSET);
+
+	status &= ISR_MASK;
+
+	if (!status)
+		return IRQ_NONE;
+
+	writel(status, iproc_i2c->base + IS_OFFSET);
+	complete_all(&iproc_i2c->done);
+
+	return IRQ_HANDLED;
+}
+
+static bool bcm_iproc_i2c_bus_busy(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	if (readl(iproc_i2c->base + M_CMD_OFFSET) &
+	    (1 << M_CMD_START_BUSY_SHIFT))
+		return true;
+	else
+		return false;
+}
+
+static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *iproc_i2c,
+				     struct i2c_msg *msg, u8 *addr)
+{
+
+	if (msg->flags & I2C_M_TEN) {
+		dev_err(iproc_i2c->device, "no support for 10-bit address\n");
+		return -EINVAL;
+	}
+
+	*addr = msg->addr << 1;
+
+	if (msg->flags & I2C_M_RD)
+		*addr |= 1;
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *iproc_i2c,
+				      struct i2c_msg *msg)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + M_CMD_OFFSET);
+	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
+
+	switch (val) {
+	case M_CMD_STATUS_SUCCESS:
+		return 0;
+
+	case M_CMD_STATUS_LOST_ARB:
+		dev_dbg(iproc_i2c->device, "lost bus arbitration\n");
+		return -EAGAIN;
+
+	case M_CMD_STATUS_NACK_ADDR:
+		dev_dbg(iproc_i2c->device, "NAK addr:0x%02x\n", msg->addr);
+		return -ENXIO;
+
+	case M_CMD_STATUS_NACK_DATA:
+		dev_dbg(iproc_i2c->device, "NAK data\n");
+		return -ENXIO;
+
+	case M_CMD_STATUS_TIMEOUT:
+		dev_dbg(iproc_i2c->device, "bus timeout\n");
+		return -ETIMEDOUT;
+
+	default:
+		dev_dbg(iproc_i2c->device, "unknown error code=%d\n", val);
+		return -EIO;
+	}
+}
+
+static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *iproc_i2c,
+					 struct i2c_msg *msg)
+{
+	int ret, i;
+	u8 addr;
+	u32 val;
+	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	if (msg->len > M_TX_RX_FIFO_SIZE - 1) {
+		dev_err(iproc_i2c->device,
+			"only support data length up to %u bytes\n",
+			M_TX_RX_FIFO_SIZE - 1);
+		return -EINVAL;
+	}
+
+	if (bcm_iproc_i2c_bus_busy(iproc_i2c)) {
+		dev_warn(iproc_i2c->device, "bus is busy\n");
+		return -EBUSY;
+	}
+
+	ret = bcm_iproc_i2c_format_addr(iproc_i2c, msg, &addr);
+	if (ret)
+		return ret;
+
+	/* load slave address into the TX FIFO */
+	writel(addr, iproc_i2c->base + M_TX_OFFSET);
+
+	/* for a write transaction, load data into the TX FIFO */
+	if (!(msg->flags & I2C_M_RD)) {
+		for (i = 0; i < msg->len; i++) {
+			val = msg->buf[i];
+
+			/* mark the last byte */
+			if (i == msg->len - 1)
+				val |= 1 << M_TX_WR_STATUS_SHIFT;
+
+			writel(val, iproc_i2c->base + M_TX_OFFSET);
+		}
+
+		if (msg->len == 0)
+			writel(1 << M_TX_WR_STATUS_SHIFT,
+			       iproc_i2c->base + M_TX_OFFSET);
+	}
+
+	/* mark as incomplete before starting the transaction */
+	reinit_completion(&iproc_i2c->done);
+
+	/*
+	 * Enable the "start busy" interrupt, which will be triggered after the
+	 * transaction is done, i.e., the internal start_busy bit, transitions
+	 * from 1 to 0.
+	 */
+	writel(1 << IE_M_START_BUSY_SHIFT, iproc_i2c->base + IE_OFFSET);
+
+	/*
+	 * Now we can activate the transfer. For a read operation, specify the
+	 * number of bytes to read
+	 */
+	val = 1 << M_CMD_START_BUSY_SHIFT;
+	if (msg->flags & I2C_M_RD) {
+		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
+		       (msg->len << M_CMD_RD_CNT_SHIFT);
+	} else {
+		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
+	}
+	writel(val, iproc_i2c->base + M_CMD_OFFSET);
+
+	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+
+	if (!time_left) {
+		dev_err(iproc_i2c->device, "transaction timed out\n");
+
+		/* flush FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return -ETIMEDOUT;
+	}
+
+	ret = bcm_iproc_i2c_check_status(iproc_i2c, msg);
+	if (ret) {
+		/* flush both TX/RX FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return ret;
+	}
+
+	/*
+	 * For a read operation, we now need to load the data from FIFO
+	 * into the memory buffer
+	 */
+	if (msg->flags & I2C_M_RD) {
+		for (i = 0; i < msg->len; i++) {
+			msg->buf[i] = (readl(iproc_i2c->base + M_RX_OFFSET) >>
+				      M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
+		}
+	}
+
+	dev_dbg(iproc_i2c->device, "xfer %c, addr=0x%02x, len=%d\n",
+		(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
+		msg->len);
+	dev_dbg(iproc_i2c->device, "**** data start ****\n");
+	for (i = 0; i < msg->len; i++)
+		dev_dbg(iproc_i2c->device, "0x%02x ",  msg->buf[i]);
+	dev_dbg(iproc_i2c->device, "**** data end ****\n");
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
+			      struct i2c_msg msgs[], int num)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = i2c_get_adapdata(adapter);
+	int ret, i;
+
+	/* go through all messages */
+	for (i = 0; i < num; i++) {
+		ret = bcm_iproc_i2c_xfer_single_msg(iproc_i2c, &msgs[i]);
+		if (ret) {
+			dev_err(iproc_i2c->device, "xfer failed\n");
+			return ret;
+		}
+	}
+
+	return num;
+}
+
+static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm bcm_iproc_algo = {
+	.master_xfer = bcm_iproc_i2c_xfer,
+	.functionality = bcm_iproc_i2c_functionality,
+};
+
+static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	unsigned int bus_speed, speed_bit;
+	u32 val;
+	int ret = of_property_read_u32(iproc_i2c->device->of_node,
+				       "clock-frequency", &bus_speed);
+	if (ret < 0) {
+		dev_info(iproc_i2c->device,
+			"unable to interpret clock-frequency DT property\n");
+		bus_speed = 100000;
+	}
+
+	if (bus_speed < 100000) {
+		dev_err(iproc_i2c->device, "%d Hz bus speed not supported\n",
+			bus_speed);
+		dev_err(iproc_i2c->device,
+			"valid speeds are 100khz and 400khz\n");
+		return -EINVAL;
+	} else if (bus_speed < 400000) {
+		speed_bit = 0;
+	} else {
+		/* bus_speed >= 400000 */
+		speed_bit = 1;
+	}
+
+	val = readl(iproc_i2c->base + TIM_CFG_OFFSET);
+	val &= ~(1 << TIM_CFG_MODE_400_SHIFT);
+	val |= speed_bit << TIM_CFG_MODE_400_SHIFT;
+	writel(val, iproc_i2c->base + TIM_CFG_OFFSET);
+
+	dev_info(iproc_i2c->device, "bus set to %u Hz\n", bus_speed);
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	/* put controller in reset */
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val |= 1 << CFG_RESET_SHIFT;
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* wait 100 usec per spec */
+	udelay(100);
+
+	/* bring controller out of reset */
+	val &= ~(1 << CFG_RESET_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
+	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
+	writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+
+	/* clear all pending interrupts */
+	writel(0xffffffff, iproc_i2c->base + IS_OFFSET);
+
+	return 0;
+}
+
+static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val |= 1 << CFG_EN_SHIFT;
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+}
+
+static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+}
+
+static int bcm_iproc_i2c_probe(struct platform_device *pdev)
+{
+	int irq, ret = 0;
+	struct bcm_iproc_i2c_dev *iproc_i2c;
+	struct i2c_adapter *adap;
+	struct resource *res;
+
+	iproc_i2c = devm_kzalloc(&pdev->dev, sizeof(*iproc_i2c),
+				 GFP_KERNEL);
+	if (!iproc_i2c)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, iproc_i2c);
+	iproc_i2c->device = &pdev->dev;
+	init_completion(&iproc_i2c->done);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	iproc_i2c->base = devm_ioremap_resource(iproc_i2c->device, res);
+	if (IS_ERR(iproc_i2c->base))
+		return PTR_ERR(iproc_i2c->base);
+
+	ret = bcm_iproc_i2c_init(iproc_i2c);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_cfg_speed(iproc_i2c);
+	if (ret)
+		return ret;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq <= 0) {
+		dev_err(iproc_i2c->device, "no irq resource\n");
+		return irq;
+	}
+	iproc_i2c->irq = irq;
+
+	ret = devm_request_irq(iproc_i2c->device, irq, bcm_iproc_i2c_isr, 0,
+			       pdev->name, iproc_i2c);
+	if (ret < 0) {
+		dev_err(iproc_i2c->device, "unable to request irq %i\n", irq);
+		return ret;
+	}
+
+	bcm_iproc_i2c_enable(iproc_i2c);
+
+	adap = &iproc_i2c->adapter;
+	i2c_set_adapdata(adap, iproc_i2c);
+	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
+	adap->algo = &bcm_iproc_algo;
+	adap->dev.parent = &pdev->dev;
+	adap->dev.of_node = pdev->dev.of_node;
+
+	ret = i2c_add_adapter(adap);
+	if (ret) {
+		dev_err(iproc_i2c->device, "failed to add adapter\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_remove(struct platform_device *pdev)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
+
+	disable_irq(iproc_i2c->irq);
+	i2c_del_adapter(&iproc_i2c->adapter);
+	bcm_iproc_i2c_disable(iproc_i2c);
+
+	return 0;
+}
+
+static const struct of_device_id bcm_iproc_i2c_of_match[] = {
+	{ .compatible = "brcm,iproc-i2c" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
+
+static struct platform_driver bcm_iproc_i2c_driver = {
+	.driver = {
+		.name = "bcm-iproc-i2c",
+		.of_match_table = bcm_iproc_i2c_of_match,
+	},
+	.probe = bcm_iproc_i2c_probe,
+	.remove = bcm_iproc_i2c_remove,
+};
+module_platform_driver(bcm_iproc_i2c_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v5 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

Add initial support to the Broadcom iProc I2C controller found in the
iProc family of SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has
a size of 64 bytes. The iProc I2C controller supports two bus speeds
including standard mode (100kHz) and fast mode (400kHz)

Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
---
 drivers/i2c/busses/Kconfig         |   10 +
 drivers/i2c/busses/Makefile        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c |  493 ++++++++++++++++++++++++++++++++++++
 3 files changed, 504 insertions(+)
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 31e8308..af76d23 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -372,6 +372,16 @@ config I2C_BCM2835
 	  This support is also available as a module.  If so, the module
 	  will be called i2c-bcm2835.
 
+config I2C_BCM_IPROC
+	tristate "Broadcom iProc I2C controller"
+	depends on ARCH_BCM_IPROC || COMPILE_TEST
+	default ARCH_BCM_IPROC
+	help
+	  If you say yes to this option, support will be included for the
+	  Broadcom iProc I2C controller.
+
+	  If you don't know what to do here, say N.
+
 config I2C_BCM_KONA
 	tristate "BCM Kona I2C adapter"
 	depends on ARCH_BCM_MOBILE
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 56388f6..d93b509 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
 obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
 obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
 obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
+obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
 obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
 obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
 obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
new file mode 100644
index 0000000..a92d8f5
--- /dev/null
+++ b/drivers/i2c/busses/i2c-bcm-iproc.c
@@ -0,0 +1,493 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+
+#define CFG_OFFSET                   0x00
+#define CFG_RESET_SHIFT              31
+#define CFG_EN_SHIFT                 30
+#define CFG_M_RETRY_CNT_SHIFT        16
+#define CFG_M_RETRY_CNT_MASK         0x0f
+
+#define TIM_CFG_OFFSET               0x04
+#define TIM_CFG_MODE_400_SHIFT       31
+
+#define M_FIFO_CTRL_OFFSET           0x0c
+#define M_FIFO_RX_FLUSH_SHIFT        31
+#define M_FIFO_TX_FLUSH_SHIFT        30
+#define M_FIFO_RX_CNT_SHIFT          16
+#define M_FIFO_RX_CNT_MASK           0x7f
+#define M_FIFO_RX_THLD_SHIFT         8
+#define M_FIFO_RX_THLD_MASK          0x3f
+
+#define M_CMD_OFFSET                 0x30
+#define M_CMD_START_BUSY_SHIFT       31
+#define M_CMD_STATUS_SHIFT           25
+#define M_CMD_STATUS_MASK            0x07
+#define M_CMD_STATUS_SUCCESS         0x0
+#define M_CMD_STATUS_LOST_ARB        0x1
+#define M_CMD_STATUS_NACK_ADDR       0x2
+#define M_CMD_STATUS_NACK_DATA       0x3
+#define M_CMD_STATUS_TIMEOUT         0x4
+#define M_CMD_PROTOCOL_SHIFT         9
+#define M_CMD_PROTOCOL_MASK          0xf
+#define M_CMD_PROTOCOL_BLK_WR        0x7
+#define M_CMD_PROTOCOL_BLK_RD        0x8
+#define M_CMD_PEC_SHIFT              8
+#define M_CMD_RD_CNT_SHIFT           0
+#define M_CMD_RD_CNT_MASK            0xff
+
+#define IE_OFFSET                    0x38
+#define IE_M_RX_FIFO_FULL_SHIFT      31
+#define IE_M_RX_THLD_SHIFT           30
+#define IE_M_START_BUSY_SHIFT        28
+
+#define IS_OFFSET                    0x3c
+#define IS_M_RX_FIFO_FULL_SHIFT      31
+#define IS_M_RX_THLD_SHIFT           30
+#define IS_M_START_BUSY_SHIFT        28
+
+#define M_TX_OFFSET                  0x40
+#define M_TX_WR_STATUS_SHIFT         31
+#define M_TX_DATA_SHIFT              0
+#define M_TX_DATA_MASK               0xff
+
+#define M_RX_OFFSET                  0x44
+#define M_RX_STATUS_SHIFT            30
+#define M_RX_STATUS_MASK             0x03
+#define M_RX_PEC_ERR_SHIFT           29
+#define M_RX_DATA_SHIFT              0
+#define M_RX_DATA_MASK               0xff
+
+#define I2C_TIMEOUT_MESC             100
+#define M_TX_RX_FIFO_SIZE            64
+
+enum bus_speed_index {
+	I2C_SPD_100K = 0,
+	I2C_SPD_400K,
+};
+
+struct bcm_iproc_i2c_dev {
+	struct device *device;
+	int irq;
+
+	void __iomem *base;
+
+	struct i2c_adapter adapter;
+
+	struct completion done;
+};
+
+/*
+ * Can be expanded in the future if more interrupt status bits are utilized
+ */
+#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
+
+static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = data;
+	u32 status = readl(iproc_i2c->base + IS_OFFSET);
+
+	status &= ISR_MASK;
+
+	if (!status)
+		return IRQ_NONE;
+
+	writel(status, iproc_i2c->base + IS_OFFSET);
+	complete_all(&iproc_i2c->done);
+
+	return IRQ_HANDLED;
+}
+
+static bool bcm_iproc_i2c_bus_busy(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	if (readl(iproc_i2c->base + M_CMD_OFFSET) &
+	    (1 << M_CMD_START_BUSY_SHIFT))
+		return true;
+	else
+		return false;
+}
+
+static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *iproc_i2c,
+				     struct i2c_msg *msg, u8 *addr)
+{
+
+	if (msg->flags & I2C_M_TEN) {
+		dev_err(iproc_i2c->device, "no support for 10-bit address\n");
+		return -EINVAL;
+	}
+
+	*addr = msg->addr << 1;
+
+	if (msg->flags & I2C_M_RD)
+		*addr |= 1;
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *iproc_i2c,
+				      struct i2c_msg *msg)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + M_CMD_OFFSET);
+	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
+
+	switch (val) {
+	case M_CMD_STATUS_SUCCESS:
+		return 0;
+
+	case M_CMD_STATUS_LOST_ARB:
+		dev_dbg(iproc_i2c->device, "lost bus arbitration\n");
+		return -EAGAIN;
+
+	case M_CMD_STATUS_NACK_ADDR:
+		dev_dbg(iproc_i2c->device, "NAK addr:0x%02x\n", msg->addr);
+		return -ENXIO;
+
+	case M_CMD_STATUS_NACK_DATA:
+		dev_dbg(iproc_i2c->device, "NAK data\n");
+		return -ENXIO;
+
+	case M_CMD_STATUS_TIMEOUT:
+		dev_dbg(iproc_i2c->device, "bus timeout\n");
+		return -ETIMEDOUT;
+
+	default:
+		dev_dbg(iproc_i2c->device, "unknown error code=%d\n", val);
+		return -EIO;
+	}
+}
+
+static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *iproc_i2c,
+					 struct i2c_msg *msg)
+{
+	int ret, i;
+	u8 addr;
+	u32 val;
+	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	if (msg->len > M_TX_RX_FIFO_SIZE - 1) {
+		dev_err(iproc_i2c->device,
+			"only support data length up to %u bytes\n",
+			M_TX_RX_FIFO_SIZE - 1);
+		return -EINVAL;
+	}
+
+	if (bcm_iproc_i2c_bus_busy(iproc_i2c)) {
+		dev_warn(iproc_i2c->device, "bus is busy\n");
+		return -EBUSY;
+	}
+
+	ret = bcm_iproc_i2c_format_addr(iproc_i2c, msg, &addr);
+	if (ret)
+		return ret;
+
+	/* load slave address into the TX FIFO */
+	writel(addr, iproc_i2c->base + M_TX_OFFSET);
+
+	/* for a write transaction, load data into the TX FIFO */
+	if (!(msg->flags & I2C_M_RD)) {
+		for (i = 0; i < msg->len; i++) {
+			val = msg->buf[i];
+
+			/* mark the last byte */
+			if (i == msg->len - 1)
+				val |= 1 << M_TX_WR_STATUS_SHIFT;
+
+			writel(val, iproc_i2c->base + M_TX_OFFSET);
+		}
+
+		if (msg->len == 0)
+			writel(1 << M_TX_WR_STATUS_SHIFT,
+			       iproc_i2c->base + M_TX_OFFSET);
+	}
+
+	/* mark as incomplete before starting the transaction */
+	reinit_completion(&iproc_i2c->done);
+
+	/*
+	 * Enable the "start busy" interrupt, which will be triggered after the
+	 * transaction is done, i.e., the internal start_busy bit, transitions
+	 * from 1 to 0.
+	 */
+	writel(1 << IE_M_START_BUSY_SHIFT, iproc_i2c->base + IE_OFFSET);
+
+	/*
+	 * Now we can activate the transfer. For a read operation, specify the
+	 * number of bytes to read
+	 */
+	val = 1 << M_CMD_START_BUSY_SHIFT;
+	if (msg->flags & I2C_M_RD) {
+		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
+		       (msg->len << M_CMD_RD_CNT_SHIFT);
+	} else {
+		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
+	}
+	writel(val, iproc_i2c->base + M_CMD_OFFSET);
+
+	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+
+	if (!time_left) {
+		dev_err(iproc_i2c->device, "transaction timed out\n");
+
+		/* flush FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return -ETIMEDOUT;
+	}
+
+	ret = bcm_iproc_i2c_check_status(iproc_i2c, msg);
+	if (ret) {
+		/* flush both TX/RX FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return ret;
+	}
+
+	/*
+	 * For a read operation, we now need to load the data from FIFO
+	 * into the memory buffer
+	 */
+	if (msg->flags & I2C_M_RD) {
+		for (i = 0; i < msg->len; i++) {
+			msg->buf[i] = (readl(iproc_i2c->base + M_RX_OFFSET) >>
+				      M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
+		}
+	}
+
+	dev_dbg(iproc_i2c->device, "xfer %c, addr=0x%02x, len=%d\n",
+		(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
+		msg->len);
+	dev_dbg(iproc_i2c->device, "**** data start ****\n");
+	for (i = 0; i < msg->len; i++)
+		dev_dbg(iproc_i2c->device, "0x%02x ",  msg->buf[i]);
+	dev_dbg(iproc_i2c->device, "**** data end ****\n");
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
+			      struct i2c_msg msgs[], int num)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = i2c_get_adapdata(adapter);
+	int ret, i;
+
+	/* go through all messages */
+	for (i = 0; i < num; i++) {
+		ret = bcm_iproc_i2c_xfer_single_msg(iproc_i2c, &msgs[i]);
+		if (ret) {
+			dev_err(iproc_i2c->device, "xfer failed\n");
+			return ret;
+		}
+	}
+
+	return num;
+}
+
+static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm bcm_iproc_algo = {
+	.master_xfer = bcm_iproc_i2c_xfer,
+	.functionality = bcm_iproc_i2c_functionality,
+};
+
+static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	unsigned int bus_speed, speed_bit;
+	u32 val;
+	int ret = of_property_read_u32(iproc_i2c->device->of_node,
+				       "clock-frequency", &bus_speed);
+	if (ret < 0) {
+		dev_info(iproc_i2c->device,
+			"unable to interpret clock-frequency DT property\n");
+		bus_speed = 100000;
+	}
+
+	if (bus_speed < 100000) {
+		dev_err(iproc_i2c->device, "%d Hz bus speed not supported\n",
+			bus_speed);
+		dev_err(iproc_i2c->device,
+			"valid speeds are 100khz and 400khz\n");
+		return -EINVAL;
+	} else if (bus_speed < 400000) {
+		speed_bit = 0;
+	} else {
+		/* bus_speed >= 400000 */
+		speed_bit = 1;
+	}
+
+	val = readl(iproc_i2c->base + TIM_CFG_OFFSET);
+	val &= ~(1 << TIM_CFG_MODE_400_SHIFT);
+	val |= speed_bit << TIM_CFG_MODE_400_SHIFT;
+	writel(val, iproc_i2c->base + TIM_CFG_OFFSET);
+
+	dev_info(iproc_i2c->device, "bus set to %u Hz\n", bus_speed);
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	/* put controller in reset */
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val |= 1 << CFG_RESET_SHIFT;
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* wait 100 usec per spec */
+	udelay(100);
+
+	/* bring controller out of reset */
+	val &= ~(1 << CFG_RESET_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
+	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
+	writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+
+	/* clear all pending interrupts */
+	writel(0xffffffff, iproc_i2c->base + IS_OFFSET);
+
+	return 0;
+}
+
+static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val |= 1 << CFG_EN_SHIFT;
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+}
+
+static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+}
+
+static int bcm_iproc_i2c_probe(struct platform_device *pdev)
+{
+	int irq, ret = 0;
+	struct bcm_iproc_i2c_dev *iproc_i2c;
+	struct i2c_adapter *adap;
+	struct resource *res;
+
+	iproc_i2c = devm_kzalloc(&pdev->dev, sizeof(*iproc_i2c),
+				 GFP_KERNEL);
+	if (!iproc_i2c)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, iproc_i2c);
+	iproc_i2c->device = &pdev->dev;
+	init_completion(&iproc_i2c->done);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	iproc_i2c->base = devm_ioremap_resource(iproc_i2c->device, res);
+	if (IS_ERR(iproc_i2c->base))
+		return PTR_ERR(iproc_i2c->base);
+
+	ret = bcm_iproc_i2c_init(iproc_i2c);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_cfg_speed(iproc_i2c);
+	if (ret)
+		return ret;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq <= 0) {
+		dev_err(iproc_i2c->device, "no irq resource\n");
+		return irq;
+	}
+	iproc_i2c->irq = irq;
+
+	ret = devm_request_irq(iproc_i2c->device, irq, bcm_iproc_i2c_isr, 0,
+			       pdev->name, iproc_i2c);
+	if (ret < 0) {
+		dev_err(iproc_i2c->device, "unable to request irq %i\n", irq);
+		return ret;
+	}
+
+	bcm_iproc_i2c_enable(iproc_i2c);
+
+	adap = &iproc_i2c->adapter;
+	i2c_set_adapdata(adap, iproc_i2c);
+	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
+	adap->algo = &bcm_iproc_algo;
+	adap->dev.parent = &pdev->dev;
+	adap->dev.of_node = pdev->dev.of_node;
+
+	ret = i2c_add_adapter(adap);
+	if (ret) {
+		dev_err(iproc_i2c->device, "failed to add adapter\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_remove(struct platform_device *pdev)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
+
+	disable_irq(iproc_i2c->irq);
+	i2c_del_adapter(&iproc_i2c->adapter);
+	bcm_iproc_i2c_disable(iproc_i2c);
+
+	return 0;
+}
+
+static const struct of_device_id bcm_iproc_i2c_of_match[] = {
+	{ .compatible = "brcm,iproc-i2c" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
+
+static struct platform_driver bcm_iproc_i2c_driver = {
+	.driver = {
+		.name = "bcm-iproc-i2c",
+		.of_match_table = bcm_iproc_i2c_of_match,
+	},
+	.probe = bcm_iproc_i2c_probe,
+	.remove = bcm_iproc_i2c_remove,
+};
+module_platform_driver(bcm_iproc_i2c_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>");
+MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v5 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

Add initial support to the Broadcom iProc I2C controller found in the
iProc family of SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has
a size of 64 bytes. The iProc I2C controller supports two bus speeds
including standard mode (100kHz) and fast mode (400kHz)

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/i2c/busses/Kconfig         |   10 +
 drivers/i2c/busses/Makefile        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c |  493 ++++++++++++++++++++++++++++++++++++
 3 files changed, 504 insertions(+)
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 31e8308..af76d23 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -372,6 +372,16 @@ config I2C_BCM2835
 	  This support is also available as a module.  If so, the module
 	  will be called i2c-bcm2835.
 
+config I2C_BCM_IPROC
+	tristate "Broadcom iProc I2C controller"
+	depends on ARCH_BCM_IPROC || COMPILE_TEST
+	default ARCH_BCM_IPROC
+	help
+	  If you say yes to this option, support will be included for the
+	  Broadcom iProc I2C controller.
+
+	  If you don't know what to do here, say N.
+
 config I2C_BCM_KONA
 	tristate "BCM Kona I2C adapter"
 	depends on ARCH_BCM_MOBILE
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 56388f6..d93b509 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
 obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
 obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
 obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
+obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
 obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
 obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
 obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
new file mode 100644
index 0000000..a92d8f5
--- /dev/null
+++ b/drivers/i2c/busses/i2c-bcm-iproc.c
@@ -0,0 +1,493 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+
+#define CFG_OFFSET                   0x00
+#define CFG_RESET_SHIFT              31
+#define CFG_EN_SHIFT                 30
+#define CFG_M_RETRY_CNT_SHIFT        16
+#define CFG_M_RETRY_CNT_MASK         0x0f
+
+#define TIM_CFG_OFFSET               0x04
+#define TIM_CFG_MODE_400_SHIFT       31
+
+#define M_FIFO_CTRL_OFFSET           0x0c
+#define M_FIFO_RX_FLUSH_SHIFT        31
+#define M_FIFO_TX_FLUSH_SHIFT        30
+#define M_FIFO_RX_CNT_SHIFT          16
+#define M_FIFO_RX_CNT_MASK           0x7f
+#define M_FIFO_RX_THLD_SHIFT         8
+#define M_FIFO_RX_THLD_MASK          0x3f
+
+#define M_CMD_OFFSET                 0x30
+#define M_CMD_START_BUSY_SHIFT       31
+#define M_CMD_STATUS_SHIFT           25
+#define M_CMD_STATUS_MASK            0x07
+#define M_CMD_STATUS_SUCCESS         0x0
+#define M_CMD_STATUS_LOST_ARB        0x1
+#define M_CMD_STATUS_NACK_ADDR       0x2
+#define M_CMD_STATUS_NACK_DATA       0x3
+#define M_CMD_STATUS_TIMEOUT         0x4
+#define M_CMD_PROTOCOL_SHIFT         9
+#define M_CMD_PROTOCOL_MASK          0xf
+#define M_CMD_PROTOCOL_BLK_WR        0x7
+#define M_CMD_PROTOCOL_BLK_RD        0x8
+#define M_CMD_PEC_SHIFT              8
+#define M_CMD_RD_CNT_SHIFT           0
+#define M_CMD_RD_CNT_MASK            0xff
+
+#define IE_OFFSET                    0x38
+#define IE_M_RX_FIFO_FULL_SHIFT      31
+#define IE_M_RX_THLD_SHIFT           30
+#define IE_M_START_BUSY_SHIFT        28
+
+#define IS_OFFSET                    0x3c
+#define IS_M_RX_FIFO_FULL_SHIFT      31
+#define IS_M_RX_THLD_SHIFT           30
+#define IS_M_START_BUSY_SHIFT        28
+
+#define M_TX_OFFSET                  0x40
+#define M_TX_WR_STATUS_SHIFT         31
+#define M_TX_DATA_SHIFT              0
+#define M_TX_DATA_MASK               0xff
+
+#define M_RX_OFFSET                  0x44
+#define M_RX_STATUS_SHIFT            30
+#define M_RX_STATUS_MASK             0x03
+#define M_RX_PEC_ERR_SHIFT           29
+#define M_RX_DATA_SHIFT              0
+#define M_RX_DATA_MASK               0xff
+
+#define I2C_TIMEOUT_MESC             100
+#define M_TX_RX_FIFO_SIZE            64
+
+enum bus_speed_index {
+	I2C_SPD_100K = 0,
+	I2C_SPD_400K,
+};
+
+struct bcm_iproc_i2c_dev {
+	struct device *device;
+	int irq;
+
+	void __iomem *base;
+
+	struct i2c_adapter adapter;
+
+	struct completion done;
+};
+
+/*
+ * Can be expanded in the future if more interrupt status bits are utilized
+ */
+#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
+
+static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = data;
+	u32 status = readl(iproc_i2c->base + IS_OFFSET);
+
+	status &= ISR_MASK;
+
+	if (!status)
+		return IRQ_NONE;
+
+	writel(status, iproc_i2c->base + IS_OFFSET);
+	complete_all(&iproc_i2c->done);
+
+	return IRQ_HANDLED;
+}
+
+static bool bcm_iproc_i2c_bus_busy(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	if (readl(iproc_i2c->base + M_CMD_OFFSET) &
+	    (1 << M_CMD_START_BUSY_SHIFT))
+		return true;
+	else
+		return false;
+}
+
+static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *iproc_i2c,
+				     struct i2c_msg *msg, u8 *addr)
+{
+
+	if (msg->flags & I2C_M_TEN) {
+		dev_err(iproc_i2c->device, "no support for 10-bit address\n");
+		return -EINVAL;
+	}
+
+	*addr = msg->addr << 1;
+
+	if (msg->flags & I2C_M_RD)
+		*addr |= 1;
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *iproc_i2c,
+				      struct i2c_msg *msg)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + M_CMD_OFFSET);
+	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
+
+	switch (val) {
+	case M_CMD_STATUS_SUCCESS:
+		return 0;
+
+	case M_CMD_STATUS_LOST_ARB:
+		dev_dbg(iproc_i2c->device, "lost bus arbitration\n");
+		return -EAGAIN;
+
+	case M_CMD_STATUS_NACK_ADDR:
+		dev_dbg(iproc_i2c->device, "NAK addr:0x%02x\n", msg->addr);
+		return -ENXIO;
+
+	case M_CMD_STATUS_NACK_DATA:
+		dev_dbg(iproc_i2c->device, "NAK data\n");
+		return -ENXIO;
+
+	case M_CMD_STATUS_TIMEOUT:
+		dev_dbg(iproc_i2c->device, "bus timeout\n");
+		return -ETIMEDOUT;
+
+	default:
+		dev_dbg(iproc_i2c->device, "unknown error code=%d\n", val);
+		return -EIO;
+	}
+}
+
+static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *iproc_i2c,
+					 struct i2c_msg *msg)
+{
+	int ret, i;
+	u8 addr;
+	u32 val;
+	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	if (msg->len > M_TX_RX_FIFO_SIZE - 1) {
+		dev_err(iproc_i2c->device,
+			"only support data length up to %u bytes\n",
+			M_TX_RX_FIFO_SIZE - 1);
+		return -EINVAL;
+	}
+
+	if (bcm_iproc_i2c_bus_busy(iproc_i2c)) {
+		dev_warn(iproc_i2c->device, "bus is busy\n");
+		return -EBUSY;
+	}
+
+	ret = bcm_iproc_i2c_format_addr(iproc_i2c, msg, &addr);
+	if (ret)
+		return ret;
+
+	/* load slave address into the TX FIFO */
+	writel(addr, iproc_i2c->base + M_TX_OFFSET);
+
+	/* for a write transaction, load data into the TX FIFO */
+	if (!(msg->flags & I2C_M_RD)) {
+		for (i = 0; i < msg->len; i++) {
+			val = msg->buf[i];
+
+			/* mark the last byte */
+			if (i == msg->len - 1)
+				val |= 1 << M_TX_WR_STATUS_SHIFT;
+
+			writel(val, iproc_i2c->base + M_TX_OFFSET);
+		}
+
+		if (msg->len == 0)
+			writel(1 << M_TX_WR_STATUS_SHIFT,
+			       iproc_i2c->base + M_TX_OFFSET);
+	}
+
+	/* mark as incomplete before starting the transaction */
+	reinit_completion(&iproc_i2c->done);
+
+	/*
+	 * Enable the "start busy" interrupt, which will be triggered after the
+	 * transaction is done, i.e., the internal start_busy bit, transitions
+	 * from 1 to 0.
+	 */
+	writel(1 << IE_M_START_BUSY_SHIFT, iproc_i2c->base + IE_OFFSET);
+
+	/*
+	 * Now we can activate the transfer. For a read operation, specify the
+	 * number of bytes to read
+	 */
+	val = 1 << M_CMD_START_BUSY_SHIFT;
+	if (msg->flags & I2C_M_RD) {
+		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
+		       (msg->len << M_CMD_RD_CNT_SHIFT);
+	} else {
+		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
+	}
+	writel(val, iproc_i2c->base + M_CMD_OFFSET);
+
+	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+
+	if (!time_left) {
+		dev_err(iproc_i2c->device, "transaction timed out\n");
+
+		/* flush FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return -ETIMEDOUT;
+	}
+
+	ret = bcm_iproc_i2c_check_status(iproc_i2c, msg);
+	if (ret) {
+		/* flush both TX/RX FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return ret;
+	}
+
+	/*
+	 * For a read operation, we now need to load the data from FIFO
+	 * into the memory buffer
+	 */
+	if (msg->flags & I2C_M_RD) {
+		for (i = 0; i < msg->len; i++) {
+			msg->buf[i] = (readl(iproc_i2c->base + M_RX_OFFSET) >>
+				      M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
+		}
+	}
+
+	dev_dbg(iproc_i2c->device, "xfer %c, addr=0x%02x, len=%d\n",
+		(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
+		msg->len);
+	dev_dbg(iproc_i2c->device, "**** data start ****\n");
+	for (i = 0; i < msg->len; i++)
+		dev_dbg(iproc_i2c->device, "0x%02x ",  msg->buf[i]);
+	dev_dbg(iproc_i2c->device, "**** data end ****\n");
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
+			      struct i2c_msg msgs[], int num)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = i2c_get_adapdata(adapter);
+	int ret, i;
+
+	/* go through all messages */
+	for (i = 0; i < num; i++) {
+		ret = bcm_iproc_i2c_xfer_single_msg(iproc_i2c, &msgs[i]);
+		if (ret) {
+			dev_err(iproc_i2c->device, "xfer failed\n");
+			return ret;
+		}
+	}
+
+	return num;
+}
+
+static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm bcm_iproc_algo = {
+	.master_xfer = bcm_iproc_i2c_xfer,
+	.functionality = bcm_iproc_i2c_functionality,
+};
+
+static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	unsigned int bus_speed, speed_bit;
+	u32 val;
+	int ret = of_property_read_u32(iproc_i2c->device->of_node,
+				       "clock-frequency", &bus_speed);
+	if (ret < 0) {
+		dev_info(iproc_i2c->device,
+			"unable to interpret clock-frequency DT property\n");
+		bus_speed = 100000;
+	}
+
+	if (bus_speed < 100000) {
+		dev_err(iproc_i2c->device, "%d Hz bus speed not supported\n",
+			bus_speed);
+		dev_err(iproc_i2c->device,
+			"valid speeds are 100khz and 400khz\n");
+		return -EINVAL;
+	} else if (bus_speed < 400000) {
+		speed_bit = 0;
+	} else {
+		/* bus_speed >= 400000 */
+		speed_bit = 1;
+	}
+
+	val = readl(iproc_i2c->base + TIM_CFG_OFFSET);
+	val &= ~(1 << TIM_CFG_MODE_400_SHIFT);
+	val |= speed_bit << TIM_CFG_MODE_400_SHIFT;
+	writel(val, iproc_i2c->base + TIM_CFG_OFFSET);
+
+	dev_info(iproc_i2c->device, "bus set to %u Hz\n", bus_speed);
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	/* put controller in reset */
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val |= 1 << CFG_RESET_SHIFT;
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* wait 100 usec per spec */
+	udelay(100);
+
+	/* bring controller out of reset */
+	val &= ~(1 << CFG_RESET_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
+	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
+	writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+
+	/* clear all pending interrupts */
+	writel(0xffffffff, iproc_i2c->base + IS_OFFSET);
+
+	return 0;
+}
+
+static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val |= 1 << CFG_EN_SHIFT;
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+}
+
+static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+}
+
+static int bcm_iproc_i2c_probe(struct platform_device *pdev)
+{
+	int irq, ret = 0;
+	struct bcm_iproc_i2c_dev *iproc_i2c;
+	struct i2c_adapter *adap;
+	struct resource *res;
+
+	iproc_i2c = devm_kzalloc(&pdev->dev, sizeof(*iproc_i2c),
+				 GFP_KERNEL);
+	if (!iproc_i2c)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, iproc_i2c);
+	iproc_i2c->device = &pdev->dev;
+	init_completion(&iproc_i2c->done);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	iproc_i2c->base = devm_ioremap_resource(iproc_i2c->device, res);
+	if (IS_ERR(iproc_i2c->base))
+		return PTR_ERR(iproc_i2c->base);
+
+	ret = bcm_iproc_i2c_init(iproc_i2c);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_cfg_speed(iproc_i2c);
+	if (ret)
+		return ret;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq <= 0) {
+		dev_err(iproc_i2c->device, "no irq resource\n");
+		return irq;
+	}
+	iproc_i2c->irq = irq;
+
+	ret = devm_request_irq(iproc_i2c->device, irq, bcm_iproc_i2c_isr, 0,
+			       pdev->name, iproc_i2c);
+	if (ret < 0) {
+		dev_err(iproc_i2c->device, "unable to request irq %i\n", irq);
+		return ret;
+	}
+
+	bcm_iproc_i2c_enable(iproc_i2c);
+
+	adap = &iproc_i2c->adapter;
+	i2c_set_adapdata(adap, iproc_i2c);
+	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
+	adap->algo = &bcm_iproc_algo;
+	adap->dev.parent = &pdev->dev;
+	adap->dev.of_node = pdev->dev.of_node;
+
+	ret = i2c_add_adapter(adap);
+	if (ret) {
+		dev_err(iproc_i2c->device, "failed to add adapter\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_remove(struct platform_device *pdev)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
+
+	disable_irq(iproc_i2c->irq);
+	i2c_del_adapter(&iproc_i2c->adapter);
+	bcm_iproc_i2c_disable(iproc_i2c);
+
+	return 0;
+}
+
+static const struct of_device_id bcm_iproc_i2c_of_match[] = {
+	{ .compatible = "brcm,iproc-i2c" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
+
+static struct platform_driver bcm_iproc_i2c_driver = {
+	.driver = {
+		.name = "bcm-iproc-i2c",
+		.of_match_table = bcm_iproc_i2c_of_match,
+	},
+	.probe = bcm_iproc_i2c_probe,
+	.remove = bcm_iproc_i2c_remove,
+};
+module_platform_driver(bcm_iproc_i2c_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v5 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
them disabled there. Individual I2C devices can be enabled in board
specific dts file when I2C slave devices are enabled in the future

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..ff5fb6a 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -70,6 +70,26 @@
 		};
 	};
 
+	i2c0: i2c@18008000 {
+		compatible = "brcm,cygnus-iproc-i2c", "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
+	i2c1: i2c@1800b000 {
+		compatible = "brcm,cygnus-iproc-i2c", "brcm,iproc-i2c";
+		reg = <0x1800b000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 86 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
 	uart0: serial@18020000 {
 		compatible = "snps,dw-apb-uart";
 		reg = <0x18020000 0x100>;
-- 
1.7.9.5

[PATCH v5 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
them disabled there. Individual I2C devices can be enabled in board
specific dts file when I2C slave devices are enabled in the future

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..ff5fb6a 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -70,6 +70,26 @@
 		};
 	};
 
+	i2c0: i2c@18008000 {
+		compatible = "brcm,cygnus-iproc-i2c", "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
+	i2c1: i2c@1800b000 {
+		compatible = "brcm,cygnus-iproc-i2c", "brcm,iproc-i2c";
+		reg = <0x1800b000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 86 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
 	uart0: serial@18020000 {
 		compatible = "snps,dw-apb-uart";
 		reg = <0x18020000 0x100>;
-- 
1.7.9.5

[PATCH v5 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
them disabled there. Individual I2C devices can be enabled in board
specific dts file when I2C slave devices are enabled in the future

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..ff5fb6a 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -70,6 +70,26 @@
 		};
 	};
 
+	i2c0: i2c at 18008000 {
+		compatible = "brcm,cygnus-iproc-i2c", "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
+	i2c1: i2c at 1800b000 {
+		compatible = "brcm,cygnus-iproc-i2c", "brcm,iproc-i2c";
+		reg = <0x1800b000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 86 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
 	uart0: serial at 18020000 {
 		compatible = "snps,dw-apb-uart";
 		reg = <0x18020000 0x100>;
-- 
1.7.9.5

Re: [PATCH v6 2/3] gpio: Cygnus: add GPIO driver

[Ray Jui]

On 1/16/2015 2:14 AM, Linus Walleij wrote:
> On Tue, Jan 13, 2015 at 6:05 PM, Ray Jui <rjui@broadcom.com> wrote:
>> On 1/13/2015 12:53 AM, Linus Walleij wrote:
>>> On Tue, Dec 16, 2014 at 3:18 AM, Ray Jui <rjui@broadcom.com> wrote:
>>>
>>>> +/* drive strength control for ASIU GPIO */
>>>> +#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
>>>> +
>>>> +/* drive strength control for CCM GPIO */
>>>> +#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00
>>>
>>> This stuff (drive strength) is pin control, pin config.
>>> It does not belong in a pure GPIO driver. If you're
>>> making a combined pin control + GPIO driver, it
>>> shall be put in drivers/pinctrl/*
>>>
>> Okay, I have some questions here. Are you suggesting me to register this
>> driver to both the pinctrl subsystem and gpiolib and move it to under
>> drivers/pinctrl/*?
> 
> Either you can have a combined driver in drivers/pinctrl/*
> which has one probe() function calling pinctrl_register(),
> gpiochip_add(), gpiochip_add_pin_range(), having the gpio
> parts call into the pin control backend with
> pinctrl_request_gpio(), pinctrl_free_gpio(),
> pinctrl_gpio_direction_input(), pinctrl_gpio_direction_output().
> 
> Or you can split it in one driver in drivers/pinctrl/*
> dealing with just the pin control stuff, and another driver
> in drivers/gpio/* dealing with the GPIO stuff, each with one
> probe() function.
> 
> If they are using the same register range, the first approach
> is probably most intuitive. If the pin control and GPIO parts
> are separated in different register ranges, probably the
> second approach is the best.
> 
>> Or Are you suggesting me to combine this driver with the other Cygnus
>> pinctrl driver (which only supports pinmux)?
> 
> Depends on which hardware block the pin control-like
> registers belongs in. See per above.
> 
>> Note in Cygnus, all pinmux logic is done in the pinmux block. And there
>> are 3 GPIO controllers, that handle GPIO, drive strength of the GPIO
>> pins, internal pull up/down of the GPIO pins, which are handled in this
>> driver. So this driver is generic to all 3 GPIO controllers, as you can
>> see from the device tree bindings, there are 3 nodes.
>>
>> Therefore, I think it makes sense to have one pinmux driver that handles
>> the pinmux block, and one generic pinctrl + gpio driver that handles
>> functions supported by all 3 GPIO controllers. Does this make sense to you?
> 
> Yep.
> 
> Some hardware designs put the software-controlled biasing
> resistors in the GPIO block electronically connected to the actual
> pins, so that e.g. the biasing will be available if some MMC or
> whatever is using the same pins in another muxing. In such
> situations it's quite evident that they need to be a combined
> GPIO and pin controller.
> 
> I have some regrets that bolting a second pin controller to the
> GPIO chip make things a bit complex but it's a price we have
> to pay for getting some kind of generic interface.
> 
> Yours,
> Linus Walleij
> 
Okay. In summary, I think both of us think the following approach makes
sense in my situation:
- leave pinmux in pinctrl-bcm-cygnus.c
- leave pinctrl + gpio in pinctrl-bcm-cygnus-gpio.c under drivers/pinctrl/*

But by thinking about this more, I thought this would create duplicated
pinctrl descriptors in our system, one from the pinmux driver, and the
other from this pinctrl+gpio driver. That is probably undesirable?

By reviewing various drivers in the pinctrl directory, I found what
pinctrl-u300.c and pinctrl-coh901.c does seems to serve as a good model
for me to follow:
- pinctrl-u300.c is the pinmux driver
- pinctrl-coh901.c is the gpio+pinctrl driver

The GPIO pinctrl logic is in the coh901 block, so pinctrl-coh901.c
exposed two public functions u300_gpio_config_get, u300_gpio_config_set
that pinctrl-u300.c can use. The u300 populates all pinmux/pinctrl
related functions into the subsystem. This way there's only one pinctrl
descriptor, populated through pinctrl-u300.c.

Does that model make more sense to you?

Thanks,

Ray

Re: [PATCH v6 2/3] gpio: Cygnus: add GPIO driver

[Ray Jui]

On 1/16/2015 2:14 AM, Linus Walleij wrote:
> On Tue, Jan 13, 2015 at 6:05 PM, Ray Jui <rjui@broadcom.com> wrote:
>> On 1/13/2015 12:53 AM, Linus Walleij wrote:
>>> On Tue, Dec 16, 2014 at 3:18 AM, Ray Jui <rjui@broadcom.com> wrote:
>>>
>>>> +/* drive strength control for ASIU GPIO */
>>>> +#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
>>>> +
>>>> +/* drive strength control for CCM GPIO */
>>>> +#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00
>>>
>>> This stuff (drive strength) is pin control, pin config.
>>> It does not belong in a pure GPIO driver. If you're
>>> making a combined pin control + GPIO driver, it
>>> shall be put in drivers/pinctrl/*
>>>
>> Okay, I have some questions here. Are you suggesting me to register this
>> driver to both the pinctrl subsystem and gpiolib and move it to under
>> drivers/pinctrl/*?
> 
> Either you can have a combined driver in drivers/pinctrl/*
> which has one probe() function calling pinctrl_register(),
> gpiochip_add(), gpiochip_add_pin_range(), having the gpio
> parts call into the pin control backend with
> pinctrl_request_gpio(), pinctrl_free_gpio(),
> pinctrl_gpio_direction_input(), pinctrl_gpio_direction_output().
> 
> Or you can split it in one driver in drivers/pinctrl/*
> dealing with just the pin control stuff, and another driver
> in drivers/gpio/* dealing with the GPIO stuff, each with one
> probe() function.
> 
> If they are using the same register range, the first approach
> is probably most intuitive. If the pin control and GPIO parts
> are separated in different register ranges, probably the
> second approach is the best.
> 
>> Or Are you suggesting me to combine this driver with the other Cygnus
>> pinctrl driver (which only supports pinmux)?
> 
> Depends on which hardware block the pin control-like
> registers belongs in. See per above.
> 
>> Note in Cygnus, all pinmux logic is done in the pinmux block. And there
>> are 3 GPIO controllers, that handle GPIO, drive strength of the GPIO
>> pins, internal pull up/down of the GPIO pins, which are handled in this
>> driver. So this driver is generic to all 3 GPIO controllers, as you can
>> see from the device tree bindings, there are 3 nodes.
>>
>> Therefore, I think it makes sense to have one pinmux driver that handles
>> the pinmux block, and one generic pinctrl + gpio driver that handles
>> functions supported by all 3 GPIO controllers. Does this make sense to you?
> 
> Yep.
> 
> Some hardware designs put the software-controlled biasing
> resistors in the GPIO block electronically connected to the actual
> pins, so that e.g. the biasing will be available if some MMC or
> whatever is using the same pins in another muxing. In such
> situations it's quite evident that they need to be a combined
> GPIO and pin controller.
> 
> I have some regrets that bolting a second pin controller to the
> GPIO chip make things a bit complex but it's a price we have
> to pay for getting some kind of generic interface.
> 
> Yours,
> Linus Walleij
> 
Okay. In summary, I think both of us think the following approach makes
sense in my situation:
- leave pinmux in pinctrl-bcm-cygnus.c
- leave pinctrl + gpio in pinctrl-bcm-cygnus-gpio.c under drivers/pinctrl/*

But by thinking about this more, I thought this would create duplicated
pinctrl descriptors in our system, one from the pinmux driver, and the
other from this pinctrl+gpio driver. That is probably undesirable?

By reviewing various drivers in the pinctrl directory, I found what
pinctrl-u300.c and pinctrl-coh901.c does seems to serve as a good model
for me to follow:
- pinctrl-u300.c is the pinmux driver
- pinctrl-coh901.c is the gpio+pinctrl driver

The GPIO pinctrl logic is in the coh901 block, so pinctrl-coh901.c
exposed two public functions u300_gpio_config_get, u300_gpio_config_set
that pinctrl-u300.c can use. The u300 populates all pinmux/pinctrl
related functions into the subsystem. This way there's only one pinctrl
descriptor, populated through pinctrl-u300.c.

Does that model make more sense to you?

Thanks,

Ray

[PATCH v6 2/3] gpio: Cygnus: add GPIO driver

[Ray Jui]

On 1/16/2015 2:14 AM, Linus Walleij wrote:
> On Tue, Jan 13, 2015 at 6:05 PM, Ray Jui <rjui@broadcom.com> wrote:
>> On 1/13/2015 12:53 AM, Linus Walleij wrote:
>>> On Tue, Dec 16, 2014 at 3:18 AM, Ray Jui <rjui@broadcom.com> wrote:
>>>
>>>> +/* drive strength control for ASIU GPIO */
>>>> +#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
>>>> +
>>>> +/* drive strength control for CCM GPIO */
>>>> +#define CYGNUS_GPIO_CCM_DRV0_CTRL_OFFSET  0x00
>>>
>>> This stuff (drive strength) is pin control, pin config.
>>> It does not belong in a pure GPIO driver. If you're
>>> making a combined pin control + GPIO driver, it
>>> shall be put in drivers/pinctrl/*
>>>
>> Okay, I have some questions here. Are you suggesting me to register this
>> driver to both the pinctrl subsystem and gpiolib and move it to under
>> drivers/pinctrl/*?
> 
> Either you can have a combined driver in drivers/pinctrl/*
> which has one probe() function calling pinctrl_register(),
> gpiochip_add(), gpiochip_add_pin_range(), having the gpio
> parts call into the pin control backend with
> pinctrl_request_gpio(), pinctrl_free_gpio(),
> pinctrl_gpio_direction_input(), pinctrl_gpio_direction_output().
> 
> Or you can split it in one driver in drivers/pinctrl/*
> dealing with just the pin control stuff, and another driver
> in drivers/gpio/* dealing with the GPIO stuff, each with one
> probe() function.
> 
> If they are using the same register range, the first approach
> is probably most intuitive. If the pin control and GPIO parts
> are separated in different register ranges, probably the
> second approach is the best.
> 
>> Or Are you suggesting me to combine this driver with the other Cygnus
>> pinctrl driver (which only supports pinmux)?
> 
> Depends on which hardware block the pin control-like
> registers belongs in. See per above.
> 
>> Note in Cygnus, all pinmux logic is done in the pinmux block. And there
>> are 3 GPIO controllers, that handle GPIO, drive strength of the GPIO
>> pins, internal pull up/down of the GPIO pins, which are handled in this
>> driver. So this driver is generic to all 3 GPIO controllers, as you can
>> see from the device tree bindings, there are 3 nodes.
>>
>> Therefore, I think it makes sense to have one pinmux driver that handles
>> the pinmux block, and one generic pinctrl + gpio driver that handles
>> functions supported by all 3 GPIO controllers. Does this make sense to you?
> 
> Yep.
> 
> Some hardware designs put the software-controlled biasing
> resistors in the GPIO block electronically connected to the actual
> pins, so that e.g. the biasing will be available if some MMC or
> whatever is using the same pins in another muxing. In such
> situations it's quite evident that they need to be a combined
> GPIO and pin controller.
> 
> I have some regrets that bolting a second pin controller to the
> GPIO chip make things a bit complex but it's a price we have
> to pay for getting some kind of generic interface.
> 
> Yours,
> Linus Walleij
> 
Okay. In summary, I think both of us think the following approach makes
sense in my situation:
- leave pinmux in pinctrl-bcm-cygnus.c
- leave pinctrl + gpio in pinctrl-bcm-cygnus-gpio.c under drivers/pinctrl/*

But by thinking about this more, I thought this would create duplicated
pinctrl descriptors in our system, one from the pinmux driver, and the
other from this pinctrl+gpio driver. That is probably undesirable?

By reviewing various drivers in the pinctrl directory, I found what
pinctrl-u300.c and pinctrl-coh901.c does seems to serve as a good model
for me to follow:
- pinctrl-u300.c is the pinmux driver
- pinctrl-coh901.c is the gpio+pinctrl driver

The GPIO pinctrl logic is in the coh901 block, so pinctrl-coh901.c
exposed two public functions u300_gpio_config_get, u300_gpio_config_set
that pinctrl-u300.c can use. The u300 populates all pinmux/pinctrl
related functions into the subsystem. This way there's only one pinctrl
descriptor, populated through pinctrl-u300.c.

Does that model make more sense to you?

Thanks,

Ray

Re: [PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Uwe Kleine-König]

Hello,

On Fri, Jan 16, 2015 at 02:09:28PM -0800, Ray Jui wrote:
> On 1/15/2015 12:41 AM, Uwe Kleine-König wrote:
> > On Wed, Jan 14, 2015 at 02:23:32PM -0800, Ray Jui wrote:
> >> +	 */
> >> +	val = 1 << M_CMD_START_BUSY_SHIFT;
> >> +	if (msg->flags & I2C_M_RD) {
> >> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
> >> +		       (msg->len << M_CMD_RD_CNT_SHIFT);
> >> +	} else {
> >> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
> >> +	}
> >> +	writel(val, iproc_i2c->base + M_CMD_OFFSET);
> >> +
> >> +	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
> > 
> > When the interrupt fires here after the complete timed out and before
> > you disable the irq you still throw the result away.
> Yes, but then this comes down to the fact that if it has reached the
> point that is determined to be a timeout condition in the driver, one
> should really treat it as timeout error. In a normal condition,
> time_left should never reach zero.
I don't agree here. I'm not sure there is a real technical reason,
though. But still if you're in a "success after timeout already over"
situation it's IMHO better to interpret it as success, not timeout.

> >> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
> >> +{
> >> +	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
> >> +
> >> +	i2c_del_adapter(&iproc_i2c->adapter);
> > You need to free the irq before i2c_del_adapter.
> > 
> Yes. Thanks. Change back to use devm_request_irq, and use disable_irq
> here before removing the adapter.
The more lightweight approach is to set your device's irq-enable
register to zero and call synchronize_irq. (For a shared irq calling
disable_irq is even wrong here.)

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

Re: [PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Uwe Kleine-König]

Hello,

On Fri, Jan 16, 2015 at 02:09:28PM -0800, Ray Jui wrote:
> On 1/15/2015 12:41 AM, Uwe Kleine-König wrote:
> > On Wed, Jan 14, 2015 at 02:23:32PM -0800, Ray Jui wrote:
> >> +	 */
> >> +	val = 1 << M_CMD_START_BUSY_SHIFT;
> >> +	if (msg->flags & I2C_M_RD) {
> >> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
> >> +		       (msg->len << M_CMD_RD_CNT_SHIFT);
> >> +	} else {
> >> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
> >> +	}
> >> +	writel(val, iproc_i2c->base + M_CMD_OFFSET);
> >> +
> >> +	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
> > 
> > When the interrupt fires here after the complete timed out and before
> > you disable the irq you still throw the result away.
> Yes, but then this comes down to the fact that if it has reached the
> point that is determined to be a timeout condition in the driver, one
> should really treat it as timeout error. In a normal condition,
> time_left should never reach zero.
I don't agree here. I'm not sure there is a real technical reason,
though. But still if you're in a "success after timeout already over"
situation it's IMHO better to interpret it as success, not timeout.

> >> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
> >> +{
> >> +	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
> >> +
> >> +	i2c_del_adapter(&iproc_i2c->adapter);
> > You need to free the irq before i2c_del_adapter.
> > 
> Yes. Thanks. Change back to use devm_request_irq, and use disable_irq
> here before removing the adapter.
The more lightweight approach is to set your device's irq-enable
register to zero and call synchronize_irq. (For a shared irq calling
disable_irq is even wrong here.)

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

[PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Uwe Kleine-König]

Hello,

On Fri, Jan 16, 2015 at 02:09:28PM -0800, Ray Jui wrote:
> On 1/15/2015 12:41 AM, Uwe Kleine-K?nig wrote:
> > On Wed, Jan 14, 2015 at 02:23:32PM -0800, Ray Jui wrote:
> >> +	 */
> >> +	val = 1 << M_CMD_START_BUSY_SHIFT;
> >> +	if (msg->flags & I2C_M_RD) {
> >> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
> >> +		       (msg->len << M_CMD_RD_CNT_SHIFT);
> >> +	} else {
> >> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
> >> +	}
> >> +	writel(val, iproc_i2c->base + M_CMD_OFFSET);
> >> +
> >> +	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
> > 
> > When the interrupt fires here after the complete timed out and before
> > you disable the irq you still throw the result away.
> Yes, but then this comes down to the fact that if it has reached the
> point that is determined to be a timeout condition in the driver, one
> should really treat it as timeout error. In a normal condition,
> time_left should never reach zero.
I don't agree here. I'm not sure there is a real technical reason,
though. But still if you're in a "success after timeout already over"
situation it's IMHO better to interpret it as success, not timeout.

> >> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
> >> +{
> >> +	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
> >> +
> >> +	i2c_del_adapter(&iproc_i2c->adapter);
> > You need to free the irq before i2c_del_adapter.
> > 
> Yes. Thanks. Change back to use devm_request_irq, and use disable_irq
> here before removing the adapter.
The more lightweight approach is to set your device's irq-enable
register to zero and call synchronize_irq. (For a shared irq calling
disable_irq is even wrong here.)

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-K?nig            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

Re: [PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/17/2015 8:01 AM, Uwe Kleine-König wrote:
> Hello,
> 
> On Fri, Jan 16, 2015 at 02:09:28PM -0800, Ray Jui wrote:
>> On 1/15/2015 12:41 AM, Uwe Kleine-König wrote:
>>> On Wed, Jan 14, 2015 at 02:23:32PM -0800, Ray Jui wrote:
>>>> +	 */
>>>> +	val = 1 << M_CMD_START_BUSY_SHIFT;
>>>> +	if (msg->flags & I2C_M_RD) {
>>>> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
>>>> +		       (msg->len << M_CMD_RD_CNT_SHIFT);
>>>> +	} else {
>>>> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
>>>> +	}
>>>> +	writel(val, iproc_i2c->base + M_CMD_OFFSET);
>>>> +
>>>> +	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
>>>
>>> When the interrupt fires here after the complete timed out and before
>>> you disable the irq you still throw the result away.
>> Yes, but then this comes down to the fact that if it has reached the
>> point that is determined to be a timeout condition in the driver, one
>> should really treat it as timeout error. In a normal condition,
>> time_left should never reach zero.
> I don't agree here. I'm not sure there is a real technical reason,
> though. But still if you're in a "success after timeout already over"
> situation it's IMHO better to interpret it as success, not timeout.
> 
The thing is, the interrupt should never fire after
wait_for_completion_timeout returns zero here. If it does, then the
issue is really that the timeout value set in the driver is probably not
long enough. I just checked other I2C drivers. I think the way how
timeout is handled here is consistent with other I2C drivers.

>>>> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
>>>> +{
>>>> +	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
>>>> +
>>>> +	i2c_del_adapter(&iproc_i2c->adapter);
>>> You need to free the irq before i2c_del_adapter.
>>>
>> Yes. Thanks. Change back to use devm_request_irq, and use disable_irq
>> here before removing the adapter.
> The more lightweight approach is to set your device's irq-enable
> register to zero and call synchronize_irq. (For a shared irq calling
> disable_irq is even wrong here.)
> 
The fact that IRQF_SHARED flag is not set indicates this is a dedicated
IRQ line, so I thought using disable_irq here makes sense. But if both
you and Wolfram think masking all I2C interrupts at the block level +
synchronize_irq is a better approach, I can change to that. Thanks!

> Best regards
> Uwe
> 

Re: [PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/17/2015 8:01 AM, Uwe Kleine-König wrote:
> Hello,
> 
> On Fri, Jan 16, 2015 at 02:09:28PM -0800, Ray Jui wrote:
>> On 1/15/2015 12:41 AM, Uwe Kleine-König wrote:
>>> On Wed, Jan 14, 2015 at 02:23:32PM -0800, Ray Jui wrote:
>>>> +	 */
>>>> +	val = 1 << M_CMD_START_BUSY_SHIFT;
>>>> +	if (msg->flags & I2C_M_RD) {
>>>> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
>>>> +		       (msg->len << M_CMD_RD_CNT_SHIFT);
>>>> +	} else {
>>>> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
>>>> +	}
>>>> +	writel(val, iproc_i2c->base + M_CMD_OFFSET);
>>>> +
>>>> +	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
>>>
>>> When the interrupt fires here after the complete timed out and before
>>> you disable the irq you still throw the result away.
>> Yes, but then this comes down to the fact that if it has reached the
>> point that is determined to be a timeout condition in the driver, one
>> should really treat it as timeout error. In a normal condition,
>> time_left should never reach zero.
> I don't agree here. I'm not sure there is a real technical reason,
> though. But still if you're in a "success after timeout already over"
> situation it's IMHO better to interpret it as success, not timeout.
> 
The thing is, the interrupt should never fire after
wait_for_completion_timeout returns zero here. If it does, then the
issue is really that the timeout value set in the driver is probably not
long enough. I just checked other I2C drivers. I think the way how
timeout is handled here is consistent with other I2C drivers.

>>>> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
>>>> +{
>>>> +	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
>>>> +
>>>> +	i2c_del_adapter(&iproc_i2c->adapter);
>>> You need to free the irq before i2c_del_adapter.
>>>
>> Yes. Thanks. Change back to use devm_request_irq, and use disable_irq
>> here before removing the adapter.
> The more lightweight approach is to set your device's irq-enable
> register to zero and call synchronize_irq. (For a shared irq calling
> disable_irq is even wrong here.)
> 
The fact that IRQF_SHARED flag is not set indicates this is a dedicated
IRQ line, so I thought using disable_irq here makes sense. But if both
you and Wolfram think masking all I2C interrupts at the block level +
synchronize_irq is a better approach, I can change to that. Thanks!

> Best regards
> Uwe
> 

[PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/17/2015 8:01 AM, Uwe Kleine-K?nig wrote:
> Hello,
> 
> On Fri, Jan 16, 2015 at 02:09:28PM -0800, Ray Jui wrote:
>> On 1/15/2015 12:41 AM, Uwe Kleine-K?nig wrote:
>>> On Wed, Jan 14, 2015 at 02:23:32PM -0800, Ray Jui wrote:
>>>> +	 */
>>>> +	val = 1 << M_CMD_START_BUSY_SHIFT;
>>>> +	if (msg->flags & I2C_M_RD) {
>>>> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
>>>> +		       (msg->len << M_CMD_RD_CNT_SHIFT);
>>>> +	} else {
>>>> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
>>>> +	}
>>>> +	writel(val, iproc_i2c->base + M_CMD_OFFSET);
>>>> +
>>>> +	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
>>>
>>> When the interrupt fires here after the complete timed out and before
>>> you disable the irq you still throw the result away.
>> Yes, but then this comes down to the fact that if it has reached the
>> point that is determined to be a timeout condition in the driver, one
>> should really treat it as timeout error. In a normal condition,
>> time_left should never reach zero.
> I don't agree here. I'm not sure there is a real technical reason,
> though. But still if you're in a "success after timeout already over"
> situation it's IMHO better to interpret it as success, not timeout.
> 
The thing is, the interrupt should never fire after
wait_for_completion_timeout returns zero here. If it does, then the
issue is really that the timeout value set in the driver is probably not
long enough. I just checked other I2C drivers. I think the way how
timeout is handled here is consistent with other I2C drivers.

>>>> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
>>>> +{
>>>> +	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
>>>> +
>>>> +	i2c_del_adapter(&iproc_i2c->adapter);
>>> You need to free the irq before i2c_del_adapter.
>>>
>> Yes. Thanks. Change back to use devm_request_irq, and use disable_irq
>> here before removing the adapter.
> The more lightweight approach is to set your device's irq-enable
> register to zero and call synchronize_irq. (For a shared irq calling
> disable_irq is even wrong here.)
> 
The fact that IRQF_SHARED flag is not set indicates this is a dedicated
IRQ line, so I thought using disable_irq here makes sense. But if both
you and Wolfram think masking all I2C interrupts at the block level +
synchronize_irq is a better approach, I can change to that. Thanks!

> Best regards
> Uwe
> 

Re: [PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Uwe Kleine-König]

Hello,

On Sat, Jan 17, 2015 at 11:58:33AM -0800, Ray Jui wrote:
> On 1/17/2015 8:01 AM, Uwe Kleine-König wrote:
> > On Fri, Jan 16, 2015 at 02:09:28PM -0800, Ray Jui wrote:
> >> On 1/15/2015 12:41 AM, Uwe Kleine-König wrote:
> >>> On Wed, Jan 14, 2015 at 02:23:32PM -0800, Ray Jui wrote:
> >>>> +	 */
> >>>> +	val = 1 << M_CMD_START_BUSY_SHIFT;
> >>>> +	if (msg->flags & I2C_M_RD) {
> >>>> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
> >>>> +		       (msg->len << M_CMD_RD_CNT_SHIFT);
> >>>> +	} else {
> >>>> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
> >>>> +	}
> >>>> +	writel(val, iproc_i2c->base + M_CMD_OFFSET);
> >>>> +
> >>>> +	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
> >>>
> >>> When the interrupt fires here after the complete timed out and before
> >>> you disable the irq you still throw the result away.
> >> Yes, but then this comes down to the fact that if it has reached the
> >> point that is determined to be a timeout condition in the driver, one
> >> should really treat it as timeout error. In a normal condition,
> >> time_left should never reach zero.
> > I don't agree here. I'm not sure there is a real technical reason,
> > though. But still if you're in a "success after timeout already over"
> > situation it's IMHO better to interpret it as success, not timeout.
> > 
> The thing is, the interrupt should never fire after
> wait_for_completion_timeout returns zero here. If it does, then the
> issue is really that the timeout value set in the driver is probably not
> long enough. I just checked other I2C drivers. I think the way how
> timeout is handled here is consistent with other I2C drivers.
In the presence of Clock stretching there is no (theorethical) upper
limit for the time needed to transfer a given message, is there? So
(theoretically) you can never be sure not to interrupt an ongoing
transfer.

And other drivers doing the same is only an excuse to start similar, but
not to not improve :-)

> >>>> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
> >>>> +{
> >>>> +	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
> >>>> +
> >>>> +	i2c_del_adapter(&iproc_i2c->adapter);
> >>> You need to free the irq before i2c_del_adapter.
> >>>
> >> Yes. Thanks. Change back to use devm_request_irq, and use disable_irq
> >> here before removing the adapter.
> > The more lightweight approach is to set your device's irq-enable
> > register to zero and call synchronize_irq. (For a shared irq calling
> > disable_irq is even wrong here.)
> > 
> The fact that IRQF_SHARED flag is not set indicates this is a dedicated
> IRQ line, so I thought using disable_irq here makes sense. But if both
> you and Wolfram think masking all I2C interrupts at the block level +
> synchronize_irq is a better approach, I can change to that. Thanks!
I don't care much. Using synchronize_irq is the more universal approach
and so more likely correct for someone copying from your driver.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

Re: [PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Uwe Kleine-König]

Hello,

On Sat, Jan 17, 2015 at 11:58:33AM -0800, Ray Jui wrote:
> On 1/17/2015 8:01 AM, Uwe Kleine-König wrote:
> > On Fri, Jan 16, 2015 at 02:09:28PM -0800, Ray Jui wrote:
> >> On 1/15/2015 12:41 AM, Uwe Kleine-König wrote:
> >>> On Wed, Jan 14, 2015 at 02:23:32PM -0800, Ray Jui wrote:
> >>>> +	 */
> >>>> +	val = 1 << M_CMD_START_BUSY_SHIFT;
> >>>> +	if (msg->flags & I2C_M_RD) {
> >>>> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
> >>>> +		       (msg->len << M_CMD_RD_CNT_SHIFT);
> >>>> +	} else {
> >>>> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
> >>>> +	}
> >>>> +	writel(val, iproc_i2c->base + M_CMD_OFFSET);
> >>>> +
> >>>> +	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
> >>>
> >>> When the interrupt fires here after the complete timed out and before
> >>> you disable the irq you still throw the result away.
> >> Yes, but then this comes down to the fact that if it has reached the
> >> point that is determined to be a timeout condition in the driver, one
> >> should really treat it as timeout error. In a normal condition,
> >> time_left should never reach zero.
> > I don't agree here. I'm not sure there is a real technical reason,
> > though. But still if you're in a "success after timeout already over"
> > situation it's IMHO better to interpret it as success, not timeout.
> > 
> The thing is, the interrupt should never fire after
> wait_for_completion_timeout returns zero here. If it does, then the
> issue is really that the timeout value set in the driver is probably not
> long enough. I just checked other I2C drivers. I think the way how
> timeout is handled here is consistent with other I2C drivers.
In the presence of Clock stretching there is no (theorethical) upper
limit for the time needed to transfer a given message, is there? So
(theoretically) you can never be sure not to interrupt an ongoing
transfer.

And other drivers doing the same is only an excuse to start similar, but
not to not improve :-)

> >>>> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
> >>>> +{
> >>>> +	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
> >>>> +
> >>>> +	i2c_del_adapter(&iproc_i2c->adapter);
> >>> You need to free the irq before i2c_del_adapter.
> >>>
> >> Yes. Thanks. Change back to use devm_request_irq, and use disable_irq
> >> here before removing the adapter.
> > The more lightweight approach is to set your device's irq-enable
> > register to zero and call synchronize_irq. (For a shared irq calling
> > disable_irq is even wrong here.)
> > 
> The fact that IRQF_SHARED flag is not set indicates this is a dedicated
> IRQ line, so I thought using disable_irq here makes sense. But if both
> you and Wolfram think masking all I2C interrupts at the block level +
> synchronize_irq is a better approach, I can change to that. Thanks!
I don't care much. Using synchronize_irq is the more universal approach
and so more likely correct for someone copying from your driver.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

[PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Uwe Kleine-König]

Hello,

On Sat, Jan 17, 2015 at 11:58:33AM -0800, Ray Jui wrote:
> On 1/17/2015 8:01 AM, Uwe Kleine-K?nig wrote:
> > On Fri, Jan 16, 2015 at 02:09:28PM -0800, Ray Jui wrote:
> >> On 1/15/2015 12:41 AM, Uwe Kleine-K?nig wrote:
> >>> On Wed, Jan 14, 2015 at 02:23:32PM -0800, Ray Jui wrote:
> >>>> +	 */
> >>>> +	val = 1 << M_CMD_START_BUSY_SHIFT;
> >>>> +	if (msg->flags & I2C_M_RD) {
> >>>> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
> >>>> +		       (msg->len << M_CMD_RD_CNT_SHIFT);
> >>>> +	} else {
> >>>> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
> >>>> +	}
> >>>> +	writel(val, iproc_i2c->base + M_CMD_OFFSET);
> >>>> +
> >>>> +	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
> >>>
> >>> When the interrupt fires here after the complete timed out and before
> >>> you disable the irq you still throw the result away.
> >> Yes, but then this comes down to the fact that if it has reached the
> >> point that is determined to be a timeout condition in the driver, one
> >> should really treat it as timeout error. In a normal condition,
> >> time_left should never reach zero.
> > I don't agree here. I'm not sure there is a real technical reason,
> > though. But still if you're in a "success after timeout already over"
> > situation it's IMHO better to interpret it as success, not timeout.
> > 
> The thing is, the interrupt should never fire after
> wait_for_completion_timeout returns zero here. If it does, then the
> issue is really that the timeout value set in the driver is probably not
> long enough. I just checked other I2C drivers. I think the way how
> timeout is handled here is consistent with other I2C drivers.
In the presence of Clock stretching there is no (theorethical) upper
limit for the time needed to transfer a given message, is there? So
(theoretically) you can never be sure not to interrupt an ongoing
transfer.

And other drivers doing the same is only an excuse to start similar, but
not to not improve :-)

> >>>> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
> >>>> +{
> >>>> +	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
> >>>> +
> >>>> +	i2c_del_adapter(&iproc_i2c->adapter);
> >>> You need to free the irq before i2c_del_adapter.
> >>>
> >> Yes. Thanks. Change back to use devm_request_irq, and use disable_irq
> >> here before removing the adapter.
> > The more lightweight approach is to set your device's irq-enable
> > register to zero and call synchronize_irq. (For a shared irq calling
> > disable_irq is even wrong here.)
> > 
> The fact that IRQF_SHARED flag is not set indicates this is a dedicated
> IRQ line, so I thought using disable_irq here makes sense. But if both
> you and Wolfram think masking all I2C interrupts at the block level +
> synchronize_irq is a better approach, I can change to that. Thanks!
I don't care much. Using synchronize_irq is the more universal approach
and so more likely correct for someone copying from your driver.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-K?nig            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

Re: [PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/17/2015 12:18 PM, Uwe Kleine-König wrote:
> Hello,
> 
> On Sat, Jan 17, 2015 at 11:58:33AM -0800, Ray Jui wrote:
>> On 1/17/2015 8:01 AM, Uwe Kleine-König wrote:
>>> On Fri, Jan 16, 2015 at 02:09:28PM -0800, Ray Jui wrote:
>>>> On 1/15/2015 12:41 AM, Uwe Kleine-König wrote:
>>>>> On Wed, Jan 14, 2015 at 02:23:32PM -0800, Ray Jui wrote:
>>>>>> +	 */
>>>>>> +	val = 1 << M_CMD_START_BUSY_SHIFT;
>>>>>> +	if (msg->flags & I2C_M_RD) {
>>>>>> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
>>>>>> +		       (msg->len << M_CMD_RD_CNT_SHIFT);
>>>>>> +	} else {
>>>>>> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
>>>>>> +	}
>>>>>> +	writel(val, iproc_i2c->base + M_CMD_OFFSET);
>>>>>> +
>>>>>> +	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
>>>>>
>>>>> When the interrupt fires here after the complete timed out and before
>>>>> you disable the irq you still throw the result away.
>>>> Yes, but then this comes down to the fact that if it has reached the
>>>> point that is determined to be a timeout condition in the driver, one
>>>> should really treat it as timeout error. In a normal condition,
>>>> time_left should never reach zero.
>>> I don't agree here. I'm not sure there is a real technical reason,
>>> though. But still if you're in a "success after timeout already over"
>>> situation it's IMHO better to interpret it as success, not timeout.
>>>
>> The thing is, the interrupt should never fire after
>> wait_for_completion_timeout returns zero here. If it does, then the
>> issue is really that the timeout value set in the driver is probably not
>> long enough. I just checked other I2C drivers. I think the way how
>> timeout is handled here is consistent with other I2C drivers.
> In the presence of Clock stretching there is no (theorethical) upper
> limit for the time needed to transfer a given message, is there? So
> (theoretically) you can never be sure not to interrupt an ongoing
> transfer.
> 
Yes. No theoretical upper limit in the case when clock is stretched by
the slave. But how would adding an additional interrupt completion check
below help? I assume you want the the check to be like the following?

	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);

	/* disable all interrupts */
	writel(0, iproc_i2c->base + IE_OFFSET);

	if (!time_left && !completion_done()) {
		dev_err(iproc_i2c->device, "transaction timed out\n");

		/* flush FIFOs */
		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
		      (1 << M_FIFO_TX_FLUSH_SHIFT);
		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
		return -ETIMEDOUT;
	}

Does the above code make sense logically? That is,
wait_for_completion_timeout has timed out, and we are doing an
additional check below to make sure it really has timed out?

> And other drivers doing the same is only an excuse to start similar, but
> not to not improve :-)
> 
>>>>>> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
>>>>>> +{
>>>>>> +	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
>>>>>> +
>>>>>> +	i2c_del_adapter(&iproc_i2c->adapter);
>>>>> You need to free the irq before i2c_del_adapter.
>>>>>
>>>> Yes. Thanks. Change back to use devm_request_irq, and use disable_irq
>>>> here before removing the adapter.
>>> The more lightweight approach is to set your device's irq-enable
>>> register to zero and call synchronize_irq. (For a shared irq calling
>>> disable_irq is even wrong here.)
>>>
>> The fact that IRQF_SHARED flag is not set indicates this is a dedicated
>> IRQ line, so I thought using disable_irq here makes sense. But if both
>> you and Wolfram think masking all I2C interrupts at the block level +
>> synchronize_irq is a better approach, I can change to that. Thanks!
> I don't care much. Using synchronize_irq is the more universal approach
> and so more likely correct for someone copying from your driver.
> 
Sure, more universal approach and a good example for others. It takes
care of both cases of dedicated and shared interrupt. I will make that
change. Thanks.
> Best regards
> Uwe
> 

Re: [PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/17/2015 12:18 PM, Uwe Kleine-König wrote:
> Hello,
> 
> On Sat, Jan 17, 2015 at 11:58:33AM -0800, Ray Jui wrote:
>> On 1/17/2015 8:01 AM, Uwe Kleine-König wrote:
>>> On Fri, Jan 16, 2015 at 02:09:28PM -0800, Ray Jui wrote:
>>>> On 1/15/2015 12:41 AM, Uwe Kleine-König wrote:
>>>>> On Wed, Jan 14, 2015 at 02:23:32PM -0800, Ray Jui wrote:
>>>>>> +	 */
>>>>>> +	val = 1 << M_CMD_START_BUSY_SHIFT;
>>>>>> +	if (msg->flags & I2C_M_RD) {
>>>>>> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
>>>>>> +		       (msg->len << M_CMD_RD_CNT_SHIFT);
>>>>>> +	} else {
>>>>>> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
>>>>>> +	}
>>>>>> +	writel(val, iproc_i2c->base + M_CMD_OFFSET);
>>>>>> +
>>>>>> +	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
>>>>>
>>>>> When the interrupt fires here after the complete timed out and before
>>>>> you disable the irq you still throw the result away.
>>>> Yes, but then this comes down to the fact that if it has reached the
>>>> point that is determined to be a timeout condition in the driver, one
>>>> should really treat it as timeout error. In a normal condition,
>>>> time_left should never reach zero.
>>> I don't agree here. I'm not sure there is a real technical reason,
>>> though. But still if you're in a "success after timeout already over"
>>> situation it's IMHO better to interpret it as success, not timeout.
>>>
>> The thing is, the interrupt should never fire after
>> wait_for_completion_timeout returns zero here. If it does, then the
>> issue is really that the timeout value set in the driver is probably not
>> long enough. I just checked other I2C drivers. I think the way how
>> timeout is handled here is consistent with other I2C drivers.
> In the presence of Clock stretching there is no (theorethical) upper
> limit for the time needed to transfer a given message, is there? So
> (theoretically) you can never be sure not to interrupt an ongoing
> transfer.
> 
Yes. No theoretical upper limit in the case when clock is stretched by
the slave. But how would adding an additional interrupt completion check
below help? I assume you want the the check to be like the following?

	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);

	/* disable all interrupts */
	writel(0, iproc_i2c->base + IE_OFFSET);

	if (!time_left && !completion_done()) {
		dev_err(iproc_i2c->device, "transaction timed out\n");

		/* flush FIFOs */
		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
		      (1 << M_FIFO_TX_FLUSH_SHIFT);
		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
		return -ETIMEDOUT;
	}

Does the above code make sense logically? That is,
wait_for_completion_timeout has timed out, and we are doing an
additional check below to make sure it really has timed out?

> And other drivers doing the same is only an excuse to start similar, but
> not to not improve :-)
> 
>>>>>> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
>>>>>> +{
>>>>>> +	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
>>>>>> +
>>>>>> +	i2c_del_adapter(&iproc_i2c->adapter);
>>>>> You need to free the irq before i2c_del_adapter.
>>>>>
>>>> Yes. Thanks. Change back to use devm_request_irq, and use disable_irq
>>>> here before removing the adapter.
>>> The more lightweight approach is to set your device's irq-enable
>>> register to zero and call synchronize_irq. (For a shared irq calling
>>> disable_irq is even wrong here.)
>>>
>> The fact that IRQF_SHARED flag is not set indicates this is a dedicated
>> IRQ line, so I thought using disable_irq here makes sense. But if both
>> you and Wolfram think masking all I2C interrupts at the block level +
>> synchronize_irq is a better approach, I can change to that. Thanks!
> I don't care much. Using synchronize_irq is the more universal approach
> and so more likely correct for someone copying from your driver.
> 
Sure, more universal approach and a good example for others. It takes
care of both cases of dedicated and shared interrupt. I will make that
change. Thanks.
> Best regards
> Uwe
> 
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[PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/17/2015 12:18 PM, Uwe Kleine-K?nig wrote:
> Hello,
> 
> On Sat, Jan 17, 2015 at 11:58:33AM -0800, Ray Jui wrote:
>> On 1/17/2015 8:01 AM, Uwe Kleine-K?nig wrote:
>>> On Fri, Jan 16, 2015 at 02:09:28PM -0800, Ray Jui wrote:
>>>> On 1/15/2015 12:41 AM, Uwe Kleine-K?nig wrote:
>>>>> On Wed, Jan 14, 2015 at 02:23:32PM -0800, Ray Jui wrote:
>>>>>> +	 */
>>>>>> +	val = 1 << M_CMD_START_BUSY_SHIFT;
>>>>>> +	if (msg->flags & I2C_M_RD) {
>>>>>> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
>>>>>> +		       (msg->len << M_CMD_RD_CNT_SHIFT);
>>>>>> +	} else {
>>>>>> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
>>>>>> +	}
>>>>>> +	writel(val, iproc_i2c->base + M_CMD_OFFSET);
>>>>>> +
>>>>>> +	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
>>>>>
>>>>> When the interrupt fires here after the complete timed out and before
>>>>> you disable the irq you still throw the result away.
>>>> Yes, but then this comes down to the fact that if it has reached the
>>>> point that is determined to be a timeout condition in the driver, one
>>>> should really treat it as timeout error. In a normal condition,
>>>> time_left should never reach zero.
>>> I don't agree here. I'm not sure there is a real technical reason,
>>> though. But still if you're in a "success after timeout already over"
>>> situation it's IMHO better to interpret it as success, not timeout.
>>>
>> The thing is, the interrupt should never fire after
>> wait_for_completion_timeout returns zero here. If it does, then the
>> issue is really that the timeout value set in the driver is probably not
>> long enough. I just checked other I2C drivers. I think the way how
>> timeout is handled here is consistent with other I2C drivers.
> In the presence of Clock stretching there is no (theorethical) upper
> limit for the time needed to transfer a given message, is there? So
> (theoretically) you can never be sure not to interrupt an ongoing
> transfer.
> 
Yes. No theoretical upper limit in the case when clock is stretched by
the slave. But how would adding an additional interrupt completion check
below help? I assume you want the the check to be like the following?

	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);

	/* disable all interrupts */
	writel(0, iproc_i2c->base + IE_OFFSET);

	if (!time_left && !completion_done()) {
		dev_err(iproc_i2c->device, "transaction timed out\n");

		/* flush FIFOs */
		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
		      (1 << M_FIFO_TX_FLUSH_SHIFT);
		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
		return -ETIMEDOUT;
	}

Does the above code make sense logically? That is,
wait_for_completion_timeout has timed out, and we are doing an
additional check below to make sure it really has timed out?

> And other drivers doing the same is only an excuse to start similar, but
> not to not improve :-)
> 
>>>>>> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
>>>>>> +{
>>>>>> +	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
>>>>>> +
>>>>>> +	i2c_del_adapter(&iproc_i2c->adapter);
>>>>> You need to free the irq before i2c_del_adapter.
>>>>>
>>>> Yes. Thanks. Change back to use devm_request_irq, and use disable_irq
>>>> here before removing the adapter.
>>> The more lightweight approach is to set your device's irq-enable
>>> register to zero and call synchronize_irq. (For a shared irq calling
>>> disable_irq is even wrong here.)
>>>
>> The fact that IRQF_SHARED flag is not set indicates this is a dedicated
>> IRQ line, so I thought using disable_irq here makes sense. But if both
>> you and Wolfram think masking all I2C interrupts at the block level +
>> synchronize_irq is a better approach, I can change to that. Thanks!
> I don't care much. Using synchronize_irq is the more universal approach
> and so more likely correct for someone copying from your driver.
> 
Sure, more universal approach and a good example for others. It takes
care of both cases of dedicated and shared interrupt. I will make that
change. Thanks.
> Best regards
> Uwe
> 

Re: [PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Uwe Kleine-König]

Hello,

On Sat, Jan 17, 2015 at 12:51:50PM -0800, Ray Jui wrote:
> On 1/17/2015 12:18 PM, Uwe Kleine-König wrote:
> > Hello,
> > 
> > On Sat, Jan 17, 2015 at 11:58:33AM -0800, Ray Jui wrote:
> >> On 1/17/2015 8:01 AM, Uwe Kleine-König wrote:
> >>> On Fri, Jan 16, 2015 at 02:09:28PM -0800, Ray Jui wrote:
> >>>> On 1/15/2015 12:41 AM, Uwe Kleine-König wrote:
> >>>>> On Wed, Jan 14, 2015 at 02:23:32PM -0800, Ray Jui wrote:
> >>>>>> +	 */
> >>>>>> +	val = 1 << M_CMD_START_BUSY_SHIFT;
> >>>>>> +	if (msg->flags & I2C_M_RD) {
> >>>>>> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
> >>>>>> +		       (msg->len << M_CMD_RD_CNT_SHIFT);
> >>>>>> +	} else {
> >>>>>> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
> >>>>>> +	}
> >>>>>> +	writel(val, iproc_i2c->base + M_CMD_OFFSET);
> >>>>>> +
> >>>>>> +	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
> >>>>>
> >>>>> When the interrupt fires here after the complete timed out and before
> >>>>> you disable the irq you still throw the result away.
> >>>> Yes, but then this comes down to the fact that if it has reached the
> >>>> point that is determined to be a timeout condition in the driver, one
> >>>> should really treat it as timeout error. In a normal condition,
> >>>> time_left should never reach zero.
> >>> I don't agree here. I'm not sure there is a real technical reason,
> >>> though. But still if you're in a "success after timeout already over"
> >>> situation it's IMHO better to interpret it as success, not timeout.
> >>>
> >> The thing is, the interrupt should never fire after
> >> wait_for_completion_timeout returns zero here. If it does, then the
> >> issue is really that the timeout value set in the driver is probably not
> >> long enough. I just checked other I2C drivers. I think the way how
> >> timeout is handled here is consistent with other I2C drivers.
> > In the presence of Clock stretching there is no (theorethical) upper
> > limit for the time needed to transfer a given message, is there? So
> > (theoretically) you can never be sure not to interrupt an ongoing
> > transfer.
> > 
> Yes. No theoretical upper limit in the case when clock is stretched by
> the slave. But how would adding an additional interrupt completion check
> below help? I assume you want the the check to be like the following?
> 
> 	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
> 
> 	/* disable all interrupts */
> 	writel(0, iproc_i2c->base + IE_OFFSET);
> 
> 	if (!time_left && !completion_done()) {
> 		dev_err(iproc_i2c->device, "transaction timed out\n");
> 
> 		/* flush FIFOs */
> 		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
> 		      (1 << M_FIFO_TX_FLUSH_SHIFT);
> 		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
> 		return -ETIMEDOUT;
> 	}
No, I want:

	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);

	if (!transfer_was_complete) {
		handle_error();
		...

	}

	handle_successful_transfer();

and time_left == 0 is not a reliable indicator that the transfer failed.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

Re: [PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Uwe Kleine-König]

Hello,

On Sat, Jan 17, 2015 at 12:51:50PM -0800, Ray Jui wrote:
> On 1/17/2015 12:18 PM, Uwe Kleine-König wrote:
> > Hello,
> > 
> > On Sat, Jan 17, 2015 at 11:58:33AM -0800, Ray Jui wrote:
> >> On 1/17/2015 8:01 AM, Uwe Kleine-König wrote:
> >>> On Fri, Jan 16, 2015 at 02:09:28PM -0800, Ray Jui wrote:
> >>>> On 1/15/2015 12:41 AM, Uwe Kleine-König wrote:
> >>>>> On Wed, Jan 14, 2015 at 02:23:32PM -0800, Ray Jui wrote:
> >>>>>> +	 */
> >>>>>> +	val = 1 << M_CMD_START_BUSY_SHIFT;
> >>>>>> +	if (msg->flags & I2C_M_RD) {
> >>>>>> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
> >>>>>> +		       (msg->len << M_CMD_RD_CNT_SHIFT);
> >>>>>> +	} else {
> >>>>>> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
> >>>>>> +	}
> >>>>>> +	writel(val, iproc_i2c->base + M_CMD_OFFSET);
> >>>>>> +
> >>>>>> +	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
> >>>>>
> >>>>> When the interrupt fires here after the complete timed out and before
> >>>>> you disable the irq you still throw the result away.
> >>>> Yes, but then this comes down to the fact that if it has reached the
> >>>> point that is determined to be a timeout condition in the driver, one
> >>>> should really treat it as timeout error. In a normal condition,
> >>>> time_left should never reach zero.
> >>> I don't agree here. I'm not sure there is a real technical reason,
> >>> though. But still if you're in a "success after timeout already over"
> >>> situation it's IMHO better to interpret it as success, not timeout.
> >>>
> >> The thing is, the interrupt should never fire after
> >> wait_for_completion_timeout returns zero here. If it does, then the
> >> issue is really that the timeout value set in the driver is probably not
> >> long enough. I just checked other I2C drivers. I think the way how
> >> timeout is handled here is consistent with other I2C drivers.
> > In the presence of Clock stretching there is no (theorethical) upper
> > limit for the time needed to transfer a given message, is there? So
> > (theoretically) you can never be sure not to interrupt an ongoing
> > transfer.
> > 
> Yes. No theoretical upper limit in the case when clock is stretched by
> the slave. But how would adding an additional interrupt completion check
> below help? I assume you want the the check to be like the following?
> 
> 	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
> 
> 	/* disable all interrupts */
> 	writel(0, iproc_i2c->base + IE_OFFSET);
> 
> 	if (!time_left && !completion_done()) {
> 		dev_err(iproc_i2c->device, "transaction timed out\n");
> 
> 		/* flush FIFOs */
> 		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
> 		      (1 << M_FIFO_TX_FLUSH_SHIFT);
> 		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
> 		return -ETIMEDOUT;
> 	}
No, I want:

	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);

	if (!transfer_was_complete) {
		handle_error();
		...

	}

	handle_successful_transfer();

and time_left == 0 is not a reliable indicator that the transfer failed.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

[PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Uwe Kleine-König]

Hello,

On Sat, Jan 17, 2015 at 12:51:50PM -0800, Ray Jui wrote:
> On 1/17/2015 12:18 PM, Uwe Kleine-K?nig wrote:
> > Hello,
> > 
> > On Sat, Jan 17, 2015 at 11:58:33AM -0800, Ray Jui wrote:
> >> On 1/17/2015 8:01 AM, Uwe Kleine-K?nig wrote:
> >>> On Fri, Jan 16, 2015 at 02:09:28PM -0800, Ray Jui wrote:
> >>>> On 1/15/2015 12:41 AM, Uwe Kleine-K?nig wrote:
> >>>>> On Wed, Jan 14, 2015 at 02:23:32PM -0800, Ray Jui wrote:
> >>>>>> +	 */
> >>>>>> +	val = 1 << M_CMD_START_BUSY_SHIFT;
> >>>>>> +	if (msg->flags & I2C_M_RD) {
> >>>>>> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
> >>>>>> +		       (msg->len << M_CMD_RD_CNT_SHIFT);
> >>>>>> +	} else {
> >>>>>> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
> >>>>>> +	}
> >>>>>> +	writel(val, iproc_i2c->base + M_CMD_OFFSET);
> >>>>>> +
> >>>>>> +	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
> >>>>>
> >>>>> When the interrupt fires here after the complete timed out and before
> >>>>> you disable the irq you still throw the result away.
> >>>> Yes, but then this comes down to the fact that if it has reached the
> >>>> point that is determined to be a timeout condition in the driver, one
> >>>> should really treat it as timeout error. In a normal condition,
> >>>> time_left should never reach zero.
> >>> I don't agree here. I'm not sure there is a real technical reason,
> >>> though. But still if you're in a "success after timeout already over"
> >>> situation it's IMHO better to interpret it as success, not timeout.
> >>>
> >> The thing is, the interrupt should never fire after
> >> wait_for_completion_timeout returns zero here. If it does, then the
> >> issue is really that the timeout value set in the driver is probably not
> >> long enough. I just checked other I2C drivers. I think the way how
> >> timeout is handled here is consistent with other I2C drivers.
> > In the presence of Clock stretching there is no (theorethical) upper
> > limit for the time needed to transfer a given message, is there? So
> > (theoretically) you can never be sure not to interrupt an ongoing
> > transfer.
> > 
> Yes. No theoretical upper limit in the case when clock is stretched by
> the slave. But how would adding an additional interrupt completion check
> below help? I assume you want the the check to be like the following?
> 
> 	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
> 
> 	/* disable all interrupts */
> 	writel(0, iproc_i2c->base + IE_OFFSET);
> 
> 	if (!time_left && !completion_done()) {
> 		dev_err(iproc_i2c->device, "transaction timed out\n");
> 
> 		/* flush FIFOs */
> 		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
> 		      (1 << M_FIFO_TX_FLUSH_SHIFT);
> 		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
> 		return -ETIMEDOUT;
> 	}
No, I want:

	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);

	if (!transfer_was_complete) {
		handle_error();
		...

	}

	handle_successful_transfer();

and time_left == 0 is not a reliable indicator that the transfer failed.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-K?nig            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

Re: [PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/17/2015 1:10 PM, Uwe Kleine-König wrote:
> Hello,
> 
> On Sat, Jan 17, 2015 at 12:51:50PM -0800, Ray Jui wrote:
>> On 1/17/2015 12:18 PM, Uwe Kleine-König wrote:
>>> Hello,
>>>
>>> On Sat, Jan 17, 2015 at 11:58:33AM -0800, Ray Jui wrote:
>>>> On 1/17/2015 8:01 AM, Uwe Kleine-König wrote:
>>>>> On Fri, Jan 16, 2015 at 02:09:28PM -0800, Ray Jui wrote:
>>>>>> On 1/15/2015 12:41 AM, Uwe Kleine-König wrote:
>>>>>>> On Wed, Jan 14, 2015 at 02:23:32PM -0800, Ray Jui wrote:
>>>>>>>> +	 */
>>>>>>>> +	val = 1 << M_CMD_START_BUSY_SHIFT;
>>>>>>>> +	if (msg->flags & I2C_M_RD) {
>>>>>>>> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
>>>>>>>> +		       (msg->len << M_CMD_RD_CNT_SHIFT);
>>>>>>>> +	} else {
>>>>>>>> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
>>>>>>>> +	}
>>>>>>>> +	writel(val, iproc_i2c->base + M_CMD_OFFSET);
>>>>>>>> +
>>>>>>>> +	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
>>>>>>>
>>>>>>> When the interrupt fires here after the complete timed out and before
>>>>>>> you disable the irq you still throw the result away.
>>>>>> Yes, but then this comes down to the fact that if it has reached the
>>>>>> point that is determined to be a timeout condition in the driver, one
>>>>>> should really treat it as timeout error. In a normal condition,
>>>>>> time_left should never reach zero.
>>>>> I don't agree here. I'm not sure there is a real technical reason,
>>>>> though. But still if you're in a "success after timeout already over"
>>>>> situation it's IMHO better to interpret it as success, not timeout.
>>>>>
>>>> The thing is, the interrupt should never fire after
>>>> wait_for_completion_timeout returns zero here. If it does, then the
>>>> issue is really that the timeout value set in the driver is probably not
>>>> long enough. I just checked other I2C drivers. I think the way how
>>>> timeout is handled here is consistent with other I2C drivers.
>>> In the presence of Clock stretching there is no (theorethical) upper
>>> limit for the time needed to transfer a given message, is there? So
>>> (theoretically) you can never be sure not to interrupt an ongoing
>>> transfer.
>>>
>> Yes. No theoretical upper limit in the case when clock is stretched by
>> the slave. But how would adding an additional interrupt completion check
>> below help? I assume you want the the check to be like the following?
>>
>> 	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
>>
>> 	/* disable all interrupts */
>> 	writel(0, iproc_i2c->base + IE_OFFSET);
>>
>> 	if (!time_left && !completion_done()) {
>> 		dev_err(iproc_i2c->device, "transaction timed out\n");
>>
>> 		/* flush FIFOs */
>> 		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
>> 		      (1 << M_FIFO_TX_FLUSH_SHIFT);
>> 		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
>> 		return -ETIMEDOUT;
>> 	}
> No, I want:
> 
> 	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
> 
> 	if (!transfer_was_complete) {
> 		handle_error();
> 		...
> 
> 	}
> 
> 	handle_successful_transfer();
> 
> and time_left == 0 is not a reliable indicator that the transfer failed.
> 
> Best regards
> Uwe
> 
Okay I'll check both time_left and transfer_was_done:
	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);

	/* disable all interrupts */
	writel(0, iproc_i2c->base + IE_OFFSET);

	if (!time_left && !atomic_read(&iproc_i2c->transfer_is_successful)) {
		dev_err(iproc_i2c->device, "transaction timed out\n");

		/* flush FIFOs */
		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
		      (1 << M_FIFO_TX_FLUSH_SHIFT);
		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
		return -ETIMEDOUT;
	}

Re: [PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/17/2015 1:10 PM, Uwe Kleine-König wrote:
> Hello,
> 
> On Sat, Jan 17, 2015 at 12:51:50PM -0800, Ray Jui wrote:
>> On 1/17/2015 12:18 PM, Uwe Kleine-König wrote:
>>> Hello,
>>>
>>> On Sat, Jan 17, 2015 at 11:58:33AM -0800, Ray Jui wrote:
>>>> On 1/17/2015 8:01 AM, Uwe Kleine-König wrote:
>>>>> On Fri, Jan 16, 2015 at 02:09:28PM -0800, Ray Jui wrote:
>>>>>> On 1/15/2015 12:41 AM, Uwe Kleine-König wrote:
>>>>>>> On Wed, Jan 14, 2015 at 02:23:32PM -0800, Ray Jui wrote:
>>>>>>>> +	 */
>>>>>>>> +	val = 1 << M_CMD_START_BUSY_SHIFT;
>>>>>>>> +	if (msg->flags & I2C_M_RD) {
>>>>>>>> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
>>>>>>>> +		       (msg->len << M_CMD_RD_CNT_SHIFT);
>>>>>>>> +	} else {
>>>>>>>> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
>>>>>>>> +	}
>>>>>>>> +	writel(val, iproc_i2c->base + M_CMD_OFFSET);
>>>>>>>> +
>>>>>>>> +	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
>>>>>>>
>>>>>>> When the interrupt fires here after the complete timed out and before
>>>>>>> you disable the irq you still throw the result away.
>>>>>> Yes, but then this comes down to the fact that if it has reached the
>>>>>> point that is determined to be a timeout condition in the driver, one
>>>>>> should really treat it as timeout error. In a normal condition,
>>>>>> time_left should never reach zero.
>>>>> I don't agree here. I'm not sure there is a real technical reason,
>>>>> though. But still if you're in a "success after timeout already over"
>>>>> situation it's IMHO better to interpret it as success, not timeout.
>>>>>
>>>> The thing is, the interrupt should never fire after
>>>> wait_for_completion_timeout returns zero here. If it does, then the
>>>> issue is really that the timeout value set in the driver is probably not
>>>> long enough. I just checked other I2C drivers. I think the way how
>>>> timeout is handled here is consistent with other I2C drivers.
>>> In the presence of Clock stretching there is no (theorethical) upper
>>> limit for the time needed to transfer a given message, is there? So
>>> (theoretically) you can never be sure not to interrupt an ongoing
>>> transfer.
>>>
>> Yes. No theoretical upper limit in the case when clock is stretched by
>> the slave. But how would adding an additional interrupt completion check
>> below help? I assume you want the the check to be like the following?
>>
>> 	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
>>
>> 	/* disable all interrupts */
>> 	writel(0, iproc_i2c->base + IE_OFFSET);
>>
>> 	if (!time_left && !completion_done()) {
>> 		dev_err(iproc_i2c->device, "transaction timed out\n");
>>
>> 		/* flush FIFOs */
>> 		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
>> 		      (1 << M_FIFO_TX_FLUSH_SHIFT);
>> 		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
>> 		return -ETIMEDOUT;
>> 	}
> No, I want:
> 
> 	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
> 
> 	if (!transfer_was_complete) {
> 		handle_error();
> 		...
> 
> 	}
> 
> 	handle_successful_transfer();
> 
> and time_left == 0 is not a reliable indicator that the transfer failed.
> 
> Best regards
> Uwe
> 
Okay I'll check both time_left and transfer_was_done:
	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);

	/* disable all interrupts */
	writel(0, iproc_i2c->base + IE_OFFSET);

	if (!time_left && !atomic_read(&iproc_i2c->transfer_is_successful)) {
		dev_err(iproc_i2c->device, "transaction timed out\n");

		/* flush FIFOs */
		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
		      (1 << M_FIFO_TX_FLUSH_SHIFT);
		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
		return -ETIMEDOUT;
	}


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[PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/17/2015 1:10 PM, Uwe Kleine-K?nig wrote:
> Hello,
> 
> On Sat, Jan 17, 2015 at 12:51:50PM -0800, Ray Jui wrote:
>> On 1/17/2015 12:18 PM, Uwe Kleine-K?nig wrote:
>>> Hello,
>>>
>>> On Sat, Jan 17, 2015 at 11:58:33AM -0800, Ray Jui wrote:
>>>> On 1/17/2015 8:01 AM, Uwe Kleine-K?nig wrote:
>>>>> On Fri, Jan 16, 2015 at 02:09:28PM -0800, Ray Jui wrote:
>>>>>> On 1/15/2015 12:41 AM, Uwe Kleine-K?nig wrote:
>>>>>>> On Wed, Jan 14, 2015 at 02:23:32PM -0800, Ray Jui wrote:
>>>>>>>> +	 */
>>>>>>>> +	val = 1 << M_CMD_START_BUSY_SHIFT;
>>>>>>>> +	if (msg->flags & I2C_M_RD) {
>>>>>>>> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
>>>>>>>> +		       (msg->len << M_CMD_RD_CNT_SHIFT);
>>>>>>>> +	} else {
>>>>>>>> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
>>>>>>>> +	}
>>>>>>>> +	writel(val, iproc_i2c->base + M_CMD_OFFSET);
>>>>>>>> +
>>>>>>>> +	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
>>>>>>>
>>>>>>> When the interrupt fires here after the complete timed out and before
>>>>>>> you disable the irq you still throw the result away.
>>>>>> Yes, but then this comes down to the fact that if it has reached the
>>>>>> point that is determined to be a timeout condition in the driver, one
>>>>>> should really treat it as timeout error. In a normal condition,
>>>>>> time_left should never reach zero.
>>>>> I don't agree here. I'm not sure there is a real technical reason,
>>>>> though. But still if you're in a "success after timeout already over"
>>>>> situation it's IMHO better to interpret it as success, not timeout.
>>>>>
>>>> The thing is, the interrupt should never fire after
>>>> wait_for_completion_timeout returns zero here. If it does, then the
>>>> issue is really that the timeout value set in the driver is probably not
>>>> long enough. I just checked other I2C drivers. I think the way how
>>>> timeout is handled here is consistent with other I2C drivers.
>>> In the presence of Clock stretching there is no (theorethical) upper
>>> limit for the time needed to transfer a given message, is there? So
>>> (theoretically) you can never be sure not to interrupt an ongoing
>>> transfer.
>>>
>> Yes. No theoretical upper limit in the case when clock is stretched by
>> the slave. But how would adding an additional interrupt completion check
>> below help? I assume you want the the check to be like the following?
>>
>> 	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
>>
>> 	/* disable all interrupts */
>> 	writel(0, iproc_i2c->base + IE_OFFSET);
>>
>> 	if (!time_left && !completion_done()) {
>> 		dev_err(iproc_i2c->device, "transaction timed out\n");
>>
>> 		/* flush FIFOs */
>> 		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
>> 		      (1 << M_FIFO_TX_FLUSH_SHIFT);
>> 		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
>> 		return -ETIMEDOUT;
>> 	}
> No, I want:
> 
> 	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
> 
> 	if (!transfer_was_complete) {
> 		handle_error();
> 		...
> 
> 	}
> 
> 	handle_successful_transfer();
> 
> and time_left == 0 is not a reliable indicator that the transfer failed.
> 
> Best regards
> Uwe
> 
Okay I'll check both time_left and transfer_was_done:
	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);

	/* disable all interrupts */
	writel(0, iproc_i2c->base + IE_OFFSET);

	if (!time_left && !atomic_read(&iproc_i2c->transfer_is_successful)) {
		dev_err(iproc_i2c->device, "transaction timed out\n");

		/* flush FIFOs */
		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
		      (1 << M_FIFO_TX_FLUSH_SHIFT);
		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
		return -ETIMEDOUT;
	}

Re: [PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Russell King - ARM Linux]

On Sat, Jan 17, 2015 at 01:26:41PM -0800, Ray Jui wrote:
> 	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
> 
> 	/* disable all interrupts */
> 	writel(0, iproc_i2c->base + IE_OFFSET);
> 
> 	if (!time_left && !atomic_read(&iproc_i2c->transfer_is_successful)) {

Why are you using atomic_read() here?

-- 
FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up
according to speedtest.net.

Re: [PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Russell King - ARM Linux]

On Sat, Jan 17, 2015 at 01:26:41PM -0800, Ray Jui wrote:
> 	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
> 
> 	/* disable all interrupts */
> 	writel(0, iproc_i2c->base + IE_OFFSET);
> 
> 	if (!time_left && !atomic_read(&iproc_i2c->transfer_is_successful)) {

Why are you using atomic_read() here?

-- 
FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up
according to speedtest.net.

[PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Russell King - ARM Linux]

On Sat, Jan 17, 2015 at 01:26:41PM -0800, Ray Jui wrote:
> 	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
> 
> 	/* disable all interrupts */
> 	writel(0, iproc_i2c->base + IE_OFFSET);
> 
> 	if (!time_left && !atomic_read(&iproc_i2c->transfer_is_successful)) {

Why are you using atomic_read() here?

-- 
FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up
according to speedtest.net.

Re: [PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/17/2015 2:40 PM, Russell King - ARM Linux wrote:
> On Sat, Jan 17, 2015 at 01:26:41PM -0800, Ray Jui wrote:
>> 	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
>>
>> 	/* disable all interrupts */
>> 	writel(0, iproc_i2c->base + IE_OFFSET);
>>
>> 	if (!time_left && !atomic_read(&iproc_i2c->transfer_is_successful)) {
> 
> Why are you using atomic_read() here?
> 
transfer_is_successful 1) will be reset to 0 in this function (before
kick start the I2C transfer), 2) will be set to 1 in the ISR (to signal
completion of the I2C transfer), and 3) will be checked in this function
here. I thought that means I should declare it volatile, because it can
be modified in both the process context and interrupt context (and I use
atomic because I remember Linux checkpatch warns against using volatile)?

Re: [PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/17/2015 2:40 PM, Russell King - ARM Linux wrote:
> On Sat, Jan 17, 2015 at 01:26:41PM -0800, Ray Jui wrote:
>> 	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
>>
>> 	/* disable all interrupts */
>> 	writel(0, iproc_i2c->base + IE_OFFSET);
>>
>> 	if (!time_left && !atomic_read(&iproc_i2c->transfer_is_successful)) {
> 
> Why are you using atomic_read() here?
> 
transfer_is_successful 1) will be reset to 0 in this function (before
kick start the I2C transfer), 2) will be set to 1 in the ISR (to signal
completion of the I2C transfer), and 3) will be checked in this function
here. I thought that means I should declare it volatile, because it can
be modified in both the process context and interrupt context (and I use
atomic because I remember Linux checkpatch warns against using volatile)?

[PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/17/2015 2:40 PM, Russell King - ARM Linux wrote:
> On Sat, Jan 17, 2015 at 01:26:41PM -0800, Ray Jui wrote:
>> 	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
>>
>> 	/* disable all interrupts */
>> 	writel(0, iproc_i2c->base + IE_OFFSET);
>>
>> 	if (!time_left && !atomic_read(&iproc_i2c->transfer_is_successful)) {
> 
> Why are you using atomic_read() here?
> 
transfer_is_successful 1) will be reset to 0 in this function (before
kick start the I2C transfer), 2) will be set to 1 in the ISR (to signal
completion of the I2C transfer), and 3) will be checked in this function
here. I thought that means I should declare it volatile, because it can
be modified in both the process context and interrupt context (and I use
atomic because I remember Linux checkpatch warns against using volatile)?

Re: [PATCH v5 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Arend van Spriel]

On 01/17/15 00:42, Ray Jui wrote:

[...]

> +/*
> + * Can be expanded in the future if more interrupt status bits are utilized
> + */
> +#define ISR_MASK (1<<  IS_M_START_BUSY_SHIFT)
> +
> +static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
> +{
> +	struct bcm_iproc_i2c_dev *iproc_i2c = data;
> +	u32 status = readl(iproc_i2c->base + IS_OFFSET);
> +
> +	status&= ISR_MASK;
> +
> +	if (!status)
> +		return IRQ_NONE;
> +
> +	writel(status, iproc_i2c->base + IS_OFFSET);
> +	complete_all(&iproc_i2c->done);

Looking over this code it seems to me there is always a single process 
waiting for iproc_i2c->done to complete. So using complete() here would 
suffice.

Regards,
Arend

> +
> +	return IRQ_HANDLED;
> +}

Re: [PATCH v5 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Arend van Spriel]

On 01/17/15 00:42, Ray Jui wrote:

[...]

> +/*
> + * Can be expanded in the future if more interrupt status bits are utilized
> + */
> +#define ISR_MASK (1<<  IS_M_START_BUSY_SHIFT)
> +
> +static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
> +{
> +	struct bcm_iproc_i2c_dev *iproc_i2c = data;
> +	u32 status = readl(iproc_i2c->base + IS_OFFSET);
> +
> +	status&= ISR_MASK;
> +
> +	if (!status)
> +		return IRQ_NONE;
> +
> +	writel(status, iproc_i2c->base + IS_OFFSET);
> +	complete_all(&iproc_i2c->done);

Looking over this code it seems to me there is always a single process 
waiting for iproc_i2c->done to complete. So using complete() here would 
suffice.

Regards,
Arend

> +
> +	return IRQ_HANDLED;
> +}

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[PATCH v5 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Arend van Spriel]

On 01/17/15 00:42, Ray Jui wrote:

[...]

> +/*
> + * Can be expanded in the future if more interrupt status bits are utilized
> + */
> +#define ISR_MASK (1<<  IS_M_START_BUSY_SHIFT)
> +
> +static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
> +{
> +	struct bcm_iproc_i2c_dev *iproc_i2c = data;
> +	u32 status = readl(iproc_i2c->base + IS_OFFSET);
> +
> +	status&= ISR_MASK;
> +
> +	if (!status)
> +		return IRQ_NONE;
> +
> +	writel(status, iproc_i2c->base + IS_OFFSET);
> +	complete_all(&iproc_i2c->done);

Looking over this code it seems to me there is always a single process 
waiting for iproc_i2c->done to complete. So using complete() here would 
suffice.

Regards,
Arend

> +
> +	return IRQ_HANDLED;
> +}

Re: [PATCH v5 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Uwe Kleine-König]

Hello,

On Sun, Jan 18, 2015 at 10:14:04AM +0100, Arend van Spriel wrote:
> On 01/17/15 00:42, Ray Jui wrote:
> 
> [...]
> 
> >+/*
> >+ * Can be expanded in the future if more interrupt status bits are utilized
> >+ */
> >+#define ISR_MASK (1<<  IS_M_START_BUSY_SHIFT)
> >+
> >+static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
> >+{
> >+	struct bcm_iproc_i2c_dev *iproc_i2c = data;
> >+	u32 status = readl(iproc_i2c->base + IS_OFFSET);
> >+
> >+	status&= ISR_MASK;
> >+
> >+	if (!status)
> >+		return IRQ_NONE;
> >+
> >+	writel(status, iproc_i2c->base + IS_OFFSET);
> >+	complete_all(&iproc_i2c->done);
> 
> Looking over this code it seems to me there is always a single
> process waiting for iproc_i2c->done to complete. So using complete()
> here would suffice.
Yeah, there is always only a single thread waiting. That means both
complete and complete_all are suitable. AFAIK there is no reason to pick
one over the other in this case.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

Re: [PATCH v5 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Uwe Kleine-König]

Hello,

On Sun, Jan 18, 2015 at 10:14:04AM +0100, Arend van Spriel wrote:
> On 01/17/15 00:42, Ray Jui wrote:
> 
> [...]
> 
> >+/*
> >+ * Can be expanded in the future if more interrupt status bits are utilized
> >+ */
> >+#define ISR_MASK (1<<  IS_M_START_BUSY_SHIFT)
> >+
> >+static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
> >+{
> >+	struct bcm_iproc_i2c_dev *iproc_i2c = data;
> >+	u32 status = readl(iproc_i2c->base + IS_OFFSET);
> >+
> >+	status&= ISR_MASK;
> >+
> >+	if (!status)
> >+		return IRQ_NONE;
> >+
> >+	writel(status, iproc_i2c->base + IS_OFFSET);
> >+	complete_all(&iproc_i2c->done);
> 
> Looking over this code it seems to me there is always a single
> process waiting for iproc_i2c->done to complete. So using complete()
> here would suffice.
Yeah, there is always only a single thread waiting. That means both
complete and complete_all are suitable. AFAIK there is no reason to pick
one over the other in this case.

Best regards
Uwe

-- 
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Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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[PATCH v5 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Uwe Kleine-König]

Hello,

On Sun, Jan 18, 2015 at 10:14:04AM +0100, Arend van Spriel wrote:
> On 01/17/15 00:42, Ray Jui wrote:
> 
> [...]
> 
> >+/*
> >+ * Can be expanded in the future if more interrupt status bits are utilized
> >+ */
> >+#define ISR_MASK (1<<  IS_M_START_BUSY_SHIFT)
> >+
> >+static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
> >+{
> >+	struct bcm_iproc_i2c_dev *iproc_i2c = data;
> >+	u32 status = readl(iproc_i2c->base + IS_OFFSET);
> >+
> >+	status&= ISR_MASK;
> >+
> >+	if (!status)
> >+		return IRQ_NONE;
> >+
> >+	writel(status, iproc_i2c->base + IS_OFFSET);
> >+	complete_all(&iproc_i2c->done);
> 
> Looking over this code it seems to me there is always a single
> process waiting for iproc_i2c->done to complete. So using complete()
> here would suffice.
Yeah, there is always only a single thread waiting. That means both
complete and complete_all are suitable. AFAIK there is no reason to pick
one over the other in this case.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-K?nig            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

Re: [PATCH v5 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Wolfram Sang]

[-- Attachment #1: Type: text/plain, Size: 1122 bytes --]

On Sun, Jan 18, 2015 at 10:47:41AM +0100, Uwe Kleine-König wrote:
> Hello,
> 
> On Sun, Jan 18, 2015 at 10:14:04AM +0100, Arend van Spriel wrote:
> > On 01/17/15 00:42, Ray Jui wrote:
> > 
> > [...]
> > 
> > >+/*
> > >+ * Can be expanded in the future if more interrupt status bits are utilized
> > >+ */
> > >+#define ISR_MASK (1<<  IS_M_START_BUSY_SHIFT)
> > >+
> > >+static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
> > >+{
> > >+	struct bcm_iproc_i2c_dev *iproc_i2c = data;
> > >+	u32 status = readl(iproc_i2c->base + IS_OFFSET);
> > >+
> > >+	status&= ISR_MASK;
> > >+
> > >+	if (!status)
> > >+		return IRQ_NONE;
> > >+
> > >+	writel(status, iproc_i2c->base + IS_OFFSET);
> > >+	complete_all(&iproc_i2c->done);
> > 
> > Looking over this code it seems to me there is always a single
> > process waiting for iproc_i2c->done to complete. So using complete()
> > here would suffice.
> Yeah, there is always only a single thread waiting. That means both
> complete and complete_all are suitable. AFAIK there is no reason to pick
> one over the other in this case.

Clarity?


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Re: [PATCH v5 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Wolfram Sang]

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On Sun, Jan 18, 2015 at 10:47:41AM +0100, Uwe Kleine-König wrote:
> Hello,
> 
> On Sun, Jan 18, 2015 at 10:14:04AM +0100, Arend van Spriel wrote:
> > On 01/17/15 00:42, Ray Jui wrote:
> > 
> > [...]
> > 
> > >+/*
> > >+ * Can be expanded in the future if more interrupt status bits are utilized
> > >+ */
> > >+#define ISR_MASK (1<<  IS_M_START_BUSY_SHIFT)
> > >+
> > >+static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
> > >+{
> > >+	struct bcm_iproc_i2c_dev *iproc_i2c = data;
> > >+	u32 status = readl(iproc_i2c->base + IS_OFFSET);
> > >+
> > >+	status&= ISR_MASK;
> > >+
> > >+	if (!status)
> > >+		return IRQ_NONE;
> > >+
> > >+	writel(status, iproc_i2c->base + IS_OFFSET);
> > >+	complete_all(&iproc_i2c->done);
> > 
> > Looking over this code it seems to me there is always a single
> > process waiting for iproc_i2c->done to complete. So using complete()
> > here would suffice.
> Yeah, there is always only a single thread waiting. That means both
> complete and complete_all are suitable. AFAIK there is no reason to pick
> one over the other in this case.

Clarity?


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[PATCH v5 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Wolfram Sang]

On Sun, Jan 18, 2015 at 10:47:41AM +0100, Uwe Kleine-K?nig wrote:
> Hello,
> 
> On Sun, Jan 18, 2015 at 10:14:04AM +0100, Arend van Spriel wrote:
> > On 01/17/15 00:42, Ray Jui wrote:
> > 
> > [...]
> > 
> > >+/*
> > >+ * Can be expanded in the future if more interrupt status bits are utilized
> > >+ */
> > >+#define ISR_MASK (1<<  IS_M_START_BUSY_SHIFT)
> > >+
> > >+static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
> > >+{
> > >+	struct bcm_iproc_i2c_dev *iproc_i2c = data;
> > >+	u32 status = readl(iproc_i2c->base + IS_OFFSET);
> > >+
> > >+	status&= ISR_MASK;
> > >+
> > >+	if (!status)
> > >+		return IRQ_NONE;
> > >+
> > >+	writel(status, iproc_i2c->base + IS_OFFSET);
> > >+	complete_all(&iproc_i2c->done);
> > 
> > Looking over this code it seems to me there is always a single
> > process waiting for iproc_i2c->done to complete. So using complete()
> > here would suffice.
> Yeah, there is always only a single thread waiting. That means both
> complete and complete_all are suitable. AFAIK there is no reason to pick
> one over the other in this case.

Clarity?

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Re: [PATCH v5 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Uwe Kleine-König]

Hello Wolfram,

On Sun, Jan 18, 2015 at 12:06:58PM +0100, Wolfram Sang wrote:
> On Sun, Jan 18, 2015 at 10:47:41AM +0100, Uwe Kleine-König wrote:
> > On Sun, Jan 18, 2015 at 10:14:04AM +0100, Arend van Spriel wrote:
> > > On 01/17/15 00:42, Ray Jui wrote:
> > > >+	complete_all(&iproc_i2c->done);
> > > 
> > > Looking over this code it seems to me there is always a single
> > > process waiting for iproc_i2c->done to complete. So using complete()
> > > here would suffice.
> > Yeah, there is always only a single thread waiting. That means both
> > complete and complete_all are suitable. AFAIK there is no reason to pick
> > one over the other in this case.
> 
> Clarity?
And which do you consider more clear? complete_all might result in the
question: "Is there >1 waiter?" and complete might yield to "What about
the other waiters?". If you already know there is only one, both are on
par on clarity. Might only be me?! I don't care much.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

[PATCH v5 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Uwe Kleine-König]

Hello Wolfram,

On Sun, Jan 18, 2015 at 12:06:58PM +0100, Wolfram Sang wrote:
> On Sun, Jan 18, 2015 at 10:47:41AM +0100, Uwe Kleine-K?nig wrote:
> > On Sun, Jan 18, 2015 at 10:14:04AM +0100, Arend van Spriel wrote:
> > > On 01/17/15 00:42, Ray Jui wrote:
> > > >+	complete_all(&iproc_i2c->done);
> > > 
> > > Looking over this code it seems to me there is always a single
> > > process waiting for iproc_i2c->done to complete. So using complete()
> > > here would suffice.
> > Yeah, there is always only a single thread waiting. That means both
> > complete and complete_all are suitable. AFAIK there is no reason to pick
> > one over the other in this case.
> 
> Clarity?
And which do you consider more clear? complete_all might result in the
question: "Is there >1 waiter?" and complete might yield to "What about
the other waiters?". If you already know there is only one, both are on
par on clarity. Might only be me?! I don't care much.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-K?nig            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

Re: [PATCH v5 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Wolfram Sang]

[-- Attachment #1: Type: text/plain, Size: 1277 bytes --]

On Sun, Jan 18, 2015 at 12:17:59PM +0100, Uwe Kleine-König wrote:
> Hello Wolfram,
> 
> On Sun, Jan 18, 2015 at 12:06:58PM +0100, Wolfram Sang wrote:
> > On Sun, Jan 18, 2015 at 10:47:41AM +0100, Uwe Kleine-König wrote:
> > > On Sun, Jan 18, 2015 at 10:14:04AM +0100, Arend van Spriel wrote:
> > > > On 01/17/15 00:42, Ray Jui wrote:
> > > > >+	complete_all(&iproc_i2c->done);
> > > > 
> > > > Looking over this code it seems to me there is always a single
> > > > process waiting for iproc_i2c->done to complete. So using complete()
> > > > here would suffice.
> > > Yeah, there is always only a single thread waiting. That means both
> > > complete and complete_all are suitable. AFAIK there is no reason to pick
> > > one over the other in this case.
> > 
> > Clarity?
> And which do you consider more clear? complete_all might result in the
> question: "Is there >1 waiter?" and complete might yield to "What about
> the other waiters?". If you already know there is only one, both are on
> par on clarity. Might only be me?! I don't care much.

It is minor, I agree: If I read complete_all, I assume there is
something fishy if there is only one waiter. It doesn't match. It might
work, but I'll wonder if this is accidently or intentionally.


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Re: [PATCH v5 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Wolfram Sang]

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On Sun, Jan 18, 2015 at 12:17:59PM +0100, Uwe Kleine-König wrote:
> Hello Wolfram,
> 
> On Sun, Jan 18, 2015 at 12:06:58PM +0100, Wolfram Sang wrote:
> > On Sun, Jan 18, 2015 at 10:47:41AM +0100, Uwe Kleine-König wrote:
> > > On Sun, Jan 18, 2015 at 10:14:04AM +0100, Arend van Spriel wrote:
> > > > On 01/17/15 00:42, Ray Jui wrote:
> > > > >+	complete_all(&iproc_i2c->done);
> > > > 
> > > > Looking over this code it seems to me there is always a single
> > > > process waiting for iproc_i2c->done to complete. So using complete()
> > > > here would suffice.
> > > Yeah, there is always only a single thread waiting. That means both
> > > complete and complete_all are suitable. AFAIK there is no reason to pick
> > > one over the other in this case.
> > 
> > Clarity?
> And which do you consider more clear? complete_all might result in the
> question: "Is there >1 waiter?" and complete might yield to "What about
> the other waiters?". If you already know there is only one, both are on
> par on clarity. Might only be me?! I don't care much.

It is minor, I agree: If I read complete_all, I assume there is
something fishy if there is only one waiter. It doesn't match. It might
work, but I'll wonder if this is accidently or intentionally.


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[PATCH v5 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Wolfram Sang]

On Sun, Jan 18, 2015 at 12:17:59PM +0100, Uwe Kleine-K?nig wrote:
> Hello Wolfram,
> 
> On Sun, Jan 18, 2015 at 12:06:58PM +0100, Wolfram Sang wrote:
> > On Sun, Jan 18, 2015 at 10:47:41AM +0100, Uwe Kleine-K?nig wrote:
> > > On Sun, Jan 18, 2015 at 10:14:04AM +0100, Arend van Spriel wrote:
> > > > On 01/17/15 00:42, Ray Jui wrote:
> > > > >+	complete_all(&iproc_i2c->done);
> > > > 
> > > > Looking over this code it seems to me there is always a single
> > > > process waiting for iproc_i2c->done to complete. So using complete()
> > > > here would suffice.
> > > Yeah, there is always only a single thread waiting. That means both
> > > complete and complete_all are suitable. AFAIK there is no reason to pick
> > > one over the other in this case.
> > 
> > Clarity?
> And which do you consider more clear? complete_all might result in the
> question: "Is there >1 waiter?" and complete might yield to "What about
> the other waiters?". If you already know there is only one, both are on
> par on clarity. Might only be me?! I don't care much.

It is minor, I agree: If I read complete_all, I assume there is
something fishy if there is only one waiter. It doesn't match. It might
work, but I'll wonder if this is accidently or intentionally.

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Re: [PATCH v5 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Arend van Spriel]

On 01/18/15 12:17, Uwe Kleine-König wrote:
> Hello Wolfram,
>
> On Sun, Jan 18, 2015 at 12:06:58PM +0100, Wolfram Sang wrote:
>> On Sun, Jan 18, 2015 at 10:47:41AM +0100, Uwe Kleine-König wrote:
>>> On Sun, Jan 18, 2015 at 10:14:04AM +0100, Arend van Spriel wrote:
>>>> On 01/17/15 00:42, Ray Jui wrote:
>>>>> +	complete_all(&iproc_i2c->done);
>>>>
>>>> Looking over this code it seems to me there is always a single
>>>> process waiting for iproc_i2c->done to complete. So using complete()
>>>> here would suffice.
>>> Yeah, there is always only a single thread waiting. That means both
>>> complete and complete_all are suitable. AFAIK there is no reason to pick
>>> one over the other in this case.
>>
>> Clarity?
> And which do you consider more clear? complete_all might result in the
> question: "Is there>1 waiter?" and complete might yield to "What about
> the other waiters?". If you already know there is only one, both are on
> par on clarity. Might only be me?! I don't care much.

Maybe it is me, but it is not about questions but it is about implicit 
statements that the code makes (or reader derives from it). When using 
complete_all you indicate to the reader "there can be more than one 
waiter". When using complete it indicates "there is only one waiter". If 
those statements are not true that is a code issue/bug.

Regards,
Arend

> Best regards
> Uwe
>

Re: [PATCH v5 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Arend van Spriel]

On 01/18/15 12:17, Uwe Kleine-König wrote:
> Hello Wolfram,
>
> On Sun, Jan 18, 2015 at 12:06:58PM +0100, Wolfram Sang wrote:
>> On Sun, Jan 18, 2015 at 10:47:41AM +0100, Uwe Kleine-König wrote:
>>> On Sun, Jan 18, 2015 at 10:14:04AM +0100, Arend van Spriel wrote:
>>>> On 01/17/15 00:42, Ray Jui wrote:
>>>>> +	complete_all(&iproc_i2c->done);
>>>>
>>>> Looking over this code it seems to me there is always a single
>>>> process waiting for iproc_i2c->done to complete. So using complete()
>>>> here would suffice.
>>> Yeah, there is always only a single thread waiting. That means both
>>> complete and complete_all are suitable. AFAIK there is no reason to pick
>>> one over the other in this case.
>>
>> Clarity?
> And which do you consider more clear? complete_all might result in the
> question: "Is there>1 waiter?" and complete might yield to "What about
> the other waiters?". If you already know there is only one, both are on
> par on clarity. Might only be me?! I don't care much.

Maybe it is me, but it is not about questions but it is about implicit 
statements that the code makes (or reader derives from it). When using 
complete_all you indicate to the reader "there can be more than one 
waiter". When using complete it indicates "there is only one waiter". If 
those statements are not true that is a code issue/bug.

Regards,
Arend

> Best regards
> Uwe
>

[PATCH v5 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Arend van Spriel]

On 01/18/15 12:17, Uwe Kleine-K?nig wrote:
> Hello Wolfram,
>
> On Sun, Jan 18, 2015 at 12:06:58PM +0100, Wolfram Sang wrote:
>> On Sun, Jan 18, 2015 at 10:47:41AM +0100, Uwe Kleine-K?nig wrote:
>>> On Sun, Jan 18, 2015 at 10:14:04AM +0100, Arend van Spriel wrote:
>>>> On 01/17/15 00:42, Ray Jui wrote:
>>>>> +	complete_all(&iproc_i2c->done);
>>>>
>>>> Looking over this code it seems to me there is always a single
>>>> process waiting for iproc_i2c->done to complete. So using complete()
>>>> here would suffice.
>>> Yeah, there is always only a single thread waiting. That means both
>>> complete and complete_all are suitable. AFAIK there is no reason to pick
>>> one over the other in this case.
>>
>> Clarity?
> And which do you consider more clear? complete_all might result in the
> question: "Is there>1 waiter?" and complete might yield to "What about
> the other waiters?". If you already know there is only one, both are on
> par on clarity. Might only be me?! I don't care much.

Maybe it is me, but it is not about questions but it is about implicit 
statements that the code makes (or reader derives from it). When using 
complete_all you indicate to the reader "there can be more than one 
waiter". When using complete it indicates "there is only one waiter". If 
those statements are not true that is a code issue/bug.

Regards,
Arend

> Best regards
> Uwe
>

Re: [PATCH v5 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Uwe Kleine-König]

Hello,

On Sun, Jan 18, 2015 at 12:46:51PM +0100, Arend van Spriel wrote:
> On 01/18/15 12:17, Uwe Kleine-König wrote:
> >Hello Wolfram,
> >
> >On Sun, Jan 18, 2015 at 12:06:58PM +0100, Wolfram Sang wrote:
> >>On Sun, Jan 18, 2015 at 10:47:41AM +0100, Uwe Kleine-König wrote:
> >>>On Sun, Jan 18, 2015 at 10:14:04AM +0100, Arend van Spriel wrote:
> >>>>On 01/17/15 00:42, Ray Jui wrote:
> >>>>>+	complete_all(&iproc_i2c->done);
> >>>>
> >>>>Looking over this code it seems to me there is always a single
> >>>>process waiting for iproc_i2c->done to complete. So using complete()
> >>>>here would suffice.
> >>>Yeah, there is always only a single thread waiting. That means both
> >>>complete and complete_all are suitable. AFAIK there is no reason to pick
> >>>one over the other in this case.
> >>
> >>Clarity?
> >And which do you consider more clear? complete_all might result in the
> >question: "Is there>1 waiter?" and complete might yield to "What about
> >the other waiters?". If you already know there is only one, both are on
> >par on clarity. Might only be me?! I don't care much.
> 
> Maybe it is me, but it is not about questions but it is about
> implicit statements that the code makes (or reader derives from it).
> When using complete_all you indicate to the reader "there can be
> more than one waiter". When using complete it indicates "there is
> only one waiter". If those statements are not true that is a code
No, complete works just fine in the presence of >1 waiter. It just wakes
a single waiter and all others continue to wait.
That is, for single-waiter situations there is no semantic difference
between complete and complete_all. But there is a difference for
multi-waiter queues.

I think this is just a matter of your POV in the single-waiter
situation: complete might be intuitive because you just completed a
single task and complete_all might be intuitive because it signals
"I'm completely done, there is noone waiting for me any more.".

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

Re: [PATCH v5 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Uwe Kleine-König]

Hello,

On Sun, Jan 18, 2015 at 12:46:51PM +0100, Arend van Spriel wrote:
> On 01/18/15 12:17, Uwe Kleine-König wrote:
> >Hello Wolfram,
> >
> >On Sun, Jan 18, 2015 at 12:06:58PM +0100, Wolfram Sang wrote:
> >>On Sun, Jan 18, 2015 at 10:47:41AM +0100, Uwe Kleine-König wrote:
> >>>On Sun, Jan 18, 2015 at 10:14:04AM +0100, Arend van Spriel wrote:
> >>>>On 01/17/15 00:42, Ray Jui wrote:
> >>>>>+	complete_all(&iproc_i2c->done);
> >>>>
> >>>>Looking over this code it seems to me there is always a single
> >>>>process waiting for iproc_i2c->done to complete. So using complete()
> >>>>here would suffice.
> >>>Yeah, there is always only a single thread waiting. That means both
> >>>complete and complete_all are suitable. AFAIK there is no reason to pick
> >>>one over the other in this case.
> >>
> >>Clarity?
> >And which do you consider more clear? complete_all might result in the
> >question: "Is there>1 waiter?" and complete might yield to "What about
> >the other waiters?". If you already know there is only one, both are on
> >par on clarity. Might only be me?! I don't care much.
> 
> Maybe it is me, but it is not about questions but it is about
> implicit statements that the code makes (or reader derives from it).
> When using complete_all you indicate to the reader "there can be
> more than one waiter". When using complete it indicates "there is
> only one waiter". If those statements are not true that is a code
No, complete works just fine in the presence of >1 waiter. It just wakes
a single waiter and all others continue to wait.
That is, for single-waiter situations there is no semantic difference
between complete and complete_all. But there is a difference for
multi-waiter queues.

I think this is just a matter of your POV in the single-waiter
situation: complete might be intuitive because you just completed a
single task and complete_all might be intuitive because it signals
"I'm completely done, there is noone waiting for me any more.".

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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[PATCH v5 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Uwe Kleine-König]

Hello,

On Sun, Jan 18, 2015 at 12:46:51PM +0100, Arend van Spriel wrote:
> On 01/18/15 12:17, Uwe Kleine-K?nig wrote:
> >Hello Wolfram,
> >
> >On Sun, Jan 18, 2015 at 12:06:58PM +0100, Wolfram Sang wrote:
> >>On Sun, Jan 18, 2015 at 10:47:41AM +0100, Uwe Kleine-K?nig wrote:
> >>>On Sun, Jan 18, 2015 at 10:14:04AM +0100, Arend van Spriel wrote:
> >>>>On 01/17/15 00:42, Ray Jui wrote:
> >>>>>+	complete_all(&iproc_i2c->done);
> >>>>
> >>>>Looking over this code it seems to me there is always a single
> >>>>process waiting for iproc_i2c->done to complete. So using complete()
> >>>>here would suffice.
> >>>Yeah, there is always only a single thread waiting. That means both
> >>>complete and complete_all are suitable. AFAIK there is no reason to pick
> >>>one over the other in this case.
> >>
> >>Clarity?
> >And which do you consider more clear? complete_all might result in the
> >question: "Is there>1 waiter?" and complete might yield to "What about
> >the other waiters?". If you already know there is only one, both are on
> >par on clarity. Might only be me?! I don't care much.
> 
> Maybe it is me, but it is not about questions but it is about
> implicit statements that the code makes (or reader derives from it).
> When using complete_all you indicate to the reader "there can be
> more than one waiter". When using complete it indicates "there is
> only one waiter". If those statements are not true that is a code
No, complete works just fine in the presence of >1 waiter. It just wakes
a single waiter and all others continue to wait.
That is, for single-waiter situations there is no semantic difference
between complete and complete_all. But there is a difference for
multi-waiter queues.

I think this is just a matter of your POV in the single-waiter
situation: complete might be intuitive because you just completed a
single task and complete_all might be intuitive because it signals
"I'm completely done, there is noone waiting for me any more.".

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-K?nig            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

Re: [PATCH v5 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Arend van Spriel]

On 01/18/15 12:56, Uwe Kleine-König wrote:
> Hello,
>
> On Sun, Jan 18, 2015 at 12:46:51PM +0100, Arend van Spriel wrote:
>> On 01/18/15 12:17, Uwe Kleine-König wrote:
>>> Hello Wolfram,
>>>
>>> On Sun, Jan 18, 2015 at 12:06:58PM +0100, Wolfram Sang wrote:
>>>> On Sun, Jan 18, 2015 at 10:47:41AM +0100, Uwe Kleine-König wrote:
>>>>> On Sun, Jan 18, 2015 at 10:14:04AM +0100, Arend van Spriel wrote:
>>>>>> On 01/17/15 00:42, Ray Jui wrote:
>>>>>>> +	complete_all(&iproc_i2c->done);
>>>>>>
>>>>>> Looking over this code it seems to me there is always a single
>>>>>> process waiting for iproc_i2c->done to complete. So using complete()
>>>>>> here would suffice.
>>>>> Yeah, there is always only a single thread waiting. That means both
>>>>> complete and complete_all are suitable. AFAIK there is no reason to pick
>>>>> one over the other in this case.
>>>>
>>>> Clarity?
>>> And which do you consider more clear? complete_all might result in the
>>> question: "Is there>1 waiter?" and complete might yield to "What about
>>> the other waiters?". If you already know there is only one, both are on
>>> par on clarity. Might only be me?! I don't care much.
>>
>> Maybe it is me, but it is not about questions but it is about
>> implicit statements that the code makes (or reader derives from it).
>> When using complete_all you indicate to the reader "there can be
>> more than one waiter". When using complete it indicates "there is
>> only one waiter". If those statements are not true that is a code
> No, complete works just fine in the presence of>1 waiter. It just wakes
> a single waiter and all others continue to wait.

Yes. Agree.

> That is, for single-waiter situations there is no semantic difference
> between complete and complete_all. But there is a difference for
> multi-waiter queues.

Indeed.

> I think this is just a matter of your POV in the single-waiter
> situation: complete might be intuitive because you just completed a
> single task and complete_all might be intuitive because it signals
> "I'm completely done, there is noone waiting for me any more.".

Ok. Let's leave it to the author's intuition or to say it differently 
"sorry for the noise" ;-)

Regards,
Arend

> Best regards
> Uwe
>

Re: [PATCH v5 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Arend van Spriel]

On 01/18/15 12:56, Uwe Kleine-König wrote:
> Hello,
>
> On Sun, Jan 18, 2015 at 12:46:51PM +0100, Arend van Spriel wrote:
>> On 01/18/15 12:17, Uwe Kleine-König wrote:
>>> Hello Wolfram,
>>>
>>> On Sun, Jan 18, 2015 at 12:06:58PM +0100, Wolfram Sang wrote:
>>>> On Sun, Jan 18, 2015 at 10:47:41AM +0100, Uwe Kleine-König wrote:
>>>>> On Sun, Jan 18, 2015 at 10:14:04AM +0100, Arend van Spriel wrote:
>>>>>> On 01/17/15 00:42, Ray Jui wrote:
>>>>>>> +	complete_all(&iproc_i2c->done);
>>>>>>
>>>>>> Looking over this code it seems to me there is always a single
>>>>>> process waiting for iproc_i2c->done to complete. So using complete()
>>>>>> here would suffice.
>>>>> Yeah, there is always only a single thread waiting. That means both
>>>>> complete and complete_all are suitable. AFAIK there is no reason to pick
>>>>> one over the other in this case.
>>>>
>>>> Clarity?
>>> And which do you consider more clear? complete_all might result in the
>>> question: "Is there>1 waiter?" and complete might yield to "What about
>>> the other waiters?". If you already know there is only one, both are on
>>> par on clarity. Might only be me?! I don't care much.
>>
>> Maybe it is me, but it is not about questions but it is about
>> implicit statements that the code makes (or reader derives from it).
>> When using complete_all you indicate to the reader "there can be
>> more than one waiter". When using complete it indicates "there is
>> only one waiter". If those statements are not true that is a code
> No, complete works just fine in the presence of>1 waiter. It just wakes
> a single waiter and all others continue to wait.

Yes. Agree.

> That is, for single-waiter situations there is no semantic difference
> between complete and complete_all. But there is a difference for
> multi-waiter queues.

Indeed.

> I think this is just a matter of your POV in the single-waiter
> situation: complete might be intuitive because you just completed a
> single task and complete_all might be intuitive because it signals
> "I'm completely done, there is noone waiting for me any more.".

Ok. Let's leave it to the author's intuition or to say it differently 
"sorry for the noise" ;-)

Regards,
Arend

> Best regards
> Uwe
>

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[PATCH v5 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Arend van Spriel]

On 01/18/15 12:56, Uwe Kleine-K?nig wrote:
> Hello,
>
> On Sun, Jan 18, 2015 at 12:46:51PM +0100, Arend van Spriel wrote:
>> On 01/18/15 12:17, Uwe Kleine-K?nig wrote:
>>> Hello Wolfram,
>>>
>>> On Sun, Jan 18, 2015 at 12:06:58PM +0100, Wolfram Sang wrote:
>>>> On Sun, Jan 18, 2015 at 10:47:41AM +0100, Uwe Kleine-K?nig wrote:
>>>>> On Sun, Jan 18, 2015 at 10:14:04AM +0100, Arend van Spriel wrote:
>>>>>> On 01/17/15 00:42, Ray Jui wrote:
>>>>>>> +	complete_all(&iproc_i2c->done);
>>>>>>
>>>>>> Looking over this code it seems to me there is always a single
>>>>>> process waiting for iproc_i2c->done to complete. So using complete()
>>>>>> here would suffice.
>>>>> Yeah, there is always only a single thread waiting. That means both
>>>>> complete and complete_all are suitable. AFAIK there is no reason to pick
>>>>> one over the other in this case.
>>>>
>>>> Clarity?
>>> And which do you consider more clear? complete_all might result in the
>>> question: "Is there>1 waiter?" and complete might yield to "What about
>>> the other waiters?". If you already know there is only one, both are on
>>> par on clarity. Might only be me?! I don't care much.
>>
>> Maybe it is me, but it is not about questions but it is about
>> implicit statements that the code makes (or reader derives from it).
>> When using complete_all you indicate to the reader "there can be
>> more than one waiter". When using complete it indicates "there is
>> only one waiter". If those statements are not true that is a code
> No, complete works just fine in the presence of>1 waiter. It just wakes
> a single waiter and all others continue to wait.

Yes. Agree.

> That is, for single-waiter situations there is no semantic difference
> between complete and complete_all. But there is a difference for
> multi-waiter queues.

Indeed.

> I think this is just a matter of your POV in the single-waiter
> situation: complete might be intuitive because you just completed a
> single task and complete_all might be intuitive because it signals
> "I'm completely done, there is noone waiting for me any more.".

Ok. Let's leave it to the author's intuition or to say it differently 
"sorry for the noise" ;-)

Regards,
Arend

> Best regards
> Uwe
>

Re: [PATCH v5 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/18/2015 4:13 AM, Arend van Spriel wrote:
> On 01/18/15 12:56, Uwe Kleine-König wrote:
>> Hello,
>>
>> On Sun, Jan 18, 2015 at 12:46:51PM +0100, Arend van Spriel wrote:
>>> On 01/18/15 12:17, Uwe Kleine-König wrote:
>>>> Hello Wolfram,
>>>>
>>>> On Sun, Jan 18, 2015 at 12:06:58PM +0100, Wolfram Sang wrote:
>>>>> On Sun, Jan 18, 2015 at 10:47:41AM +0100, Uwe Kleine-König wrote:
>>>>>> On Sun, Jan 18, 2015 at 10:14:04AM +0100, Arend van Spriel wrote:
>>>>>>> On 01/17/15 00:42, Ray Jui wrote:
>>>>>>>> +    complete_all(&iproc_i2c->done);
>>>>>>>
>>>>>>> Looking over this code it seems to me there is always a single
>>>>>>> process waiting for iproc_i2c->done to complete. So using complete()
>>>>>>> here would suffice.
>>>>>> Yeah, there is always only a single thread waiting. That means both
>>>>>> complete and complete_all are suitable. AFAIK there is no reason
>>>>>> to pick
>>>>>> one over the other in this case.
>>>>>
>>>>> Clarity?
>>>> And which do you consider more clear? complete_all might result in the
>>>> question: "Is there>1 waiter?" and complete might yield to "What about
>>>> the other waiters?". If you already know there is only one, both are on
>>>> par on clarity. Might only be me?! I don't care much.
>>>
>>> Maybe it is me, but it is not about questions but it is about
>>> implicit statements that the code makes (or reader derives from it).
>>> When using complete_all you indicate to the reader "there can be
>>> more than one waiter". When using complete it indicates "there is
>>> only one waiter". If those statements are not true that is a code
>> No, complete works just fine in the presence of>1 waiter. It just wakes
>> a single waiter and all others continue to wait.
> 
> Yes. Agree.
> 
>> That is, for single-waiter situations there is no semantic difference
>> between complete and complete_all. But there is a difference for
>> multi-waiter queues.
> 
> Indeed.
> 
>> I think this is just a matter of your POV in the single-waiter
>> situation: complete might be intuitive because you just completed a
>> single task and complete_all might be intuitive because it signals
>> "I'm completely done, there is noone waiting for me any more.".
> 
> Ok. Let's leave it to the author's intuition or to say it differently
> "sorry for the noise" ;-)
Will stay with complete_all since I meant to say "after this transfer
complete interrupt, there should be no one waiting anymore (although
there's currently only one waiter, and will likely stay that way)"

Thanks!

> 
> Regards,
> Arend
> 
>> Best regards
>> Uwe
>>
> 

Re: [PATCH v5 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/18/2015 4:13 AM, Arend van Spriel wrote:
> On 01/18/15 12:56, Uwe Kleine-König wrote:
>> Hello,
>>
>> On Sun, Jan 18, 2015 at 12:46:51PM +0100, Arend van Spriel wrote:
>>> On 01/18/15 12:17, Uwe Kleine-König wrote:
>>>> Hello Wolfram,
>>>>
>>>> On Sun, Jan 18, 2015 at 12:06:58PM +0100, Wolfram Sang wrote:
>>>>> On Sun, Jan 18, 2015 at 10:47:41AM +0100, Uwe Kleine-König wrote:
>>>>>> On Sun, Jan 18, 2015 at 10:14:04AM +0100, Arend van Spriel wrote:
>>>>>>> On 01/17/15 00:42, Ray Jui wrote:
>>>>>>>> +    complete_all(&iproc_i2c->done);
>>>>>>>
>>>>>>> Looking over this code it seems to me there is always a single
>>>>>>> process waiting for iproc_i2c->done to complete. So using complete()
>>>>>>> here would suffice.
>>>>>> Yeah, there is always only a single thread waiting. That means both
>>>>>> complete and complete_all are suitable. AFAIK there is no reason
>>>>>> to pick
>>>>>> one over the other in this case.
>>>>>
>>>>> Clarity?
>>>> And which do you consider more clear? complete_all might result in the
>>>> question: "Is there>1 waiter?" and complete might yield to "What about
>>>> the other waiters?". If you already know there is only one, both are on
>>>> par on clarity. Might only be me?! I don't care much.
>>>
>>> Maybe it is me, but it is not about questions but it is about
>>> implicit statements that the code makes (or reader derives from it).
>>> When using complete_all you indicate to the reader "there can be
>>> more than one waiter". When using complete it indicates "there is
>>> only one waiter". If those statements are not true that is a code
>> No, complete works just fine in the presence of>1 waiter. It just wakes
>> a single waiter and all others continue to wait.
> 
> Yes. Agree.
> 
>> That is, for single-waiter situations there is no semantic difference
>> between complete and complete_all. But there is a difference for
>> multi-waiter queues.
> 
> Indeed.
> 
>> I think this is just a matter of your POV in the single-waiter
>> situation: complete might be intuitive because you just completed a
>> single task and complete_all might be intuitive because it signals
>> "I'm completely done, there is noone waiting for me any more.".
> 
> Ok. Let's leave it to the author's intuition or to say it differently
> "sorry for the noise" ;-)
Will stay with complete_all since I meant to say "after this transfer
complete interrupt, there should be no one waiting anymore (although
there's currently only one waiter, and will likely stay that way)"

Thanks!

> 
> Regards,
> Arend
> 
>> Best regards
>> Uwe
>>
> 
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[PATCH v5 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/18/2015 4:13 AM, Arend van Spriel wrote:
> On 01/18/15 12:56, Uwe Kleine-K?nig wrote:
>> Hello,
>>
>> On Sun, Jan 18, 2015 at 12:46:51PM +0100, Arend van Spriel wrote:
>>> On 01/18/15 12:17, Uwe Kleine-K?nig wrote:
>>>> Hello Wolfram,
>>>>
>>>> On Sun, Jan 18, 2015 at 12:06:58PM +0100, Wolfram Sang wrote:
>>>>> On Sun, Jan 18, 2015 at 10:47:41AM +0100, Uwe Kleine-K?nig wrote:
>>>>>> On Sun, Jan 18, 2015 at 10:14:04AM +0100, Arend van Spriel wrote:
>>>>>>> On 01/17/15 00:42, Ray Jui wrote:
>>>>>>>> +    complete_all(&iproc_i2c->done);
>>>>>>>
>>>>>>> Looking over this code it seems to me there is always a single
>>>>>>> process waiting for iproc_i2c->done to complete. So using complete()
>>>>>>> here would suffice.
>>>>>> Yeah, there is always only a single thread waiting. That means both
>>>>>> complete and complete_all are suitable. AFAIK there is no reason
>>>>>> to pick
>>>>>> one over the other in this case.
>>>>>
>>>>> Clarity?
>>>> And which do you consider more clear? complete_all might result in the
>>>> question: "Is there>1 waiter?" and complete might yield to "What about
>>>> the other waiters?". If you already know there is only one, both are on
>>>> par on clarity. Might only be me?! I don't care much.
>>>
>>> Maybe it is me, but it is not about questions but it is about
>>> implicit statements that the code makes (or reader derives from it).
>>> When using complete_all you indicate to the reader "there can be
>>> more than one waiter". When using complete it indicates "there is
>>> only one waiter". If those statements are not true that is a code
>> No, complete works just fine in the presence of>1 waiter. It just wakes
>> a single waiter and all others continue to wait.
> 
> Yes. Agree.
> 
>> That is, for single-waiter situations there is no semantic difference
>> between complete and complete_all. But there is a difference for
>> multi-waiter queues.
> 
> Indeed.
> 
>> I think this is just a matter of your POV in the single-waiter
>> situation: complete might be intuitive because you just completed a
>> single task and complete_all might be intuitive because it signals
>> "I'm completely done, there is noone waiting for me any more.".
> 
> Ok. Let's leave it to the author's intuition or to say it differently
> "sorry for the noise" ;-)
Will stay with complete_all since I meant to say "after this transfer
complete interrupt, there should be no one waiting anymore (although
there's currently only one waiter, and will likely stay that way)"

Thanks!

> 
> Regards,
> Arend
> 
>> Best regards
>> Uwe
>>
> 

[PATCH v6 0/3] Add I2C support to Broadcom iProc

[Ray Jui]

This patchset contains the initial I2C support for Broadcom iProc family of
SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has a
size of 64 bytes. The iProc I2C controller supports two bus speeds including
standard mode (100 kHz) and fast mode (400 kHz)

Changes from v5:
 - Improve the "waiting for transaction to be complete" logic to take care of
   the corner case when an interrupt fires after wait_for_completion_timeout
   times out
 - Improve the logic to disable I2C interrupt in the remove function. Make it
   more generic so it works for both dedicated and shared interrupt

Changes from v4:
 - Remove redundant header file includes
 - Change the logic that waits for the host controller to be idle to
   simply return -EBUSY
 - Use proper print level and error codes in the driver
 - Allow zero length message in the driver to support I2C_SMBUS_QUICK
 - Change back to use devm_request_irq. Disable interrupt in the remove
   function so there's no outstanding I2C interrupt when the driver is
   being removed from the framework
 - Other minor miscellaneous improvements and fixes

Changes from v3:
 - Add config dependency to COMPILE_TEST to allow the driver to be build tested
   by other platforms
 - Improve CPU utilization efficiency in the loop of waiting for bus to idle
 - Add more comment in the driver to clarify the way how the "start busy"
   interrupt is triggered from the I2C controller
 - Fix inconsistent coding style and format
 - Improve the bus speed validation logic in the driver
 - Add code to free the interrupt line in driver's remove function. Also
   change to use non-devm API to request the interrupt line
 - Other miscellaneous improvements and fixes

Changes from v2:
 - Have the I2C driver default to y so it does not need to be selected from
   ARCH_BCM_IPROC. This also helps to get rid of one patch. The driver still
   depends on ARCH_BCM_IPROC
 - Get rid of redundant check on resource returned by platform_get_resource

Changes from v1:
 - Fix function argument parenthesis
 - Get rid of redundant driver owner field

Ray Jui (3):
  i2c: iProc: define Broadcom iProc I2C binding
  i2c: iproc: Add Broadcom iProc I2C Driver
  ARM: dts: add I2C device nodes for Broadcom Cygnus

 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   20 +
 drivers/i2c/busses/Kconfig                         |   10 +
 drivers/i2c/busses/Makefile                        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c                 |  499 ++++++++++++++++++++
 5 files changed, 567 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

-- 
1.7.9.5

[PATCH v6 0/3] Add I2C support to Broadcom iProc

[Ray Jui]

This patchset contains the initial I2C support for Broadcom iProc family of
SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has a
size of 64 bytes. The iProc I2C controller supports two bus speeds including
standard mode (100 kHz) and fast mode (400 kHz)

Changes from v5:
 - Improve the "waiting for transaction to be complete" logic to take care of
   the corner case when an interrupt fires after wait_for_completion_timeout
   times out
 - Improve the logic to disable I2C interrupt in the remove function. Make it
   more generic so it works for both dedicated and shared interrupt

Changes from v4:
 - Remove redundant header file includes
 - Change the logic that waits for the host controller to be idle to
   simply return -EBUSY
 - Use proper print level and error codes in the driver
 - Allow zero length message in the driver to support I2C_SMBUS_QUICK
 - Change back to use devm_request_irq. Disable interrupt in the remove
   function so there's no outstanding I2C interrupt when the driver is
   being removed from the framework
 - Other minor miscellaneous improvements and fixes

Changes from v3:
 - Add config dependency to COMPILE_TEST to allow the driver to be build tested
   by other platforms
 - Improve CPU utilization efficiency in the loop of waiting for bus to idle
 - Add more comment in the driver to clarify the way how the "start busy"
   interrupt is triggered from the I2C controller
 - Fix inconsistent coding style and format
 - Improve the bus speed validation logic in the driver
 - Add code to free the interrupt line in driver's remove function. Also
   change to use non-devm API to request the interrupt line
 - Other miscellaneous improvements and fixes

Changes from v2:
 - Have the I2C driver default to y so it does not need to be selected from
   ARCH_BCM_IPROC. This also helps to get rid of one patch. The driver still
   depends on ARCH_BCM_IPROC
 - Get rid of redundant check on resource returned by platform_get_resource

Changes from v1:
 - Fix function argument parenthesis
 - Get rid of redundant driver owner field

Ray Jui (3):
  i2c: iProc: define Broadcom iProc I2C binding
  i2c: iproc: Add Broadcom iProc I2C Driver
  ARM: dts: add I2C device nodes for Broadcom Cygnus

 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   20 +
 drivers/i2c/busses/Kconfig                         |   10 +
 drivers/i2c/busses/Makefile                        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c                 |  499 ++++++++++++++++++++
 5 files changed, 567 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

-- 
1.7.9.5

--
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[PATCH v6 0/3] Add I2C support to Broadcom iProc

[Ray Jui]

This patchset contains the initial I2C support for Broadcom iProc family of
SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has a
size of 64 bytes. The iProc I2C controller supports two bus speeds including
standard mode (100 kHz) and fast mode (400 kHz)

Changes from v5:
 - Improve the "waiting for transaction to be complete" logic to take care of
   the corner case when an interrupt fires after wait_for_completion_timeout
   times out
 - Improve the logic to disable I2C interrupt in the remove function. Make it
   more generic so it works for both dedicated and shared interrupt

Changes from v4:
 - Remove redundant header file includes
 - Change the logic that waits for the host controller to be idle to
   simply return -EBUSY
 - Use proper print level and error codes in the driver
 - Allow zero length message in the driver to support I2C_SMBUS_QUICK
 - Change back to use devm_request_irq. Disable interrupt in the remove
   function so there's no outstanding I2C interrupt when the driver is
   being removed from the framework
 - Other minor miscellaneous improvements and fixes

Changes from v3:
 - Add config dependency to COMPILE_TEST to allow the driver to be build tested
   by other platforms
 - Improve CPU utilization efficiency in the loop of waiting for bus to idle
 - Add more comment in the driver to clarify the way how the "start busy"
   interrupt is triggered from the I2C controller
 - Fix inconsistent coding style and format
 - Improve the bus speed validation logic in the driver
 - Add code to free the interrupt line in driver's remove function. Also
   change to use non-devm API to request the interrupt line
 - Other miscellaneous improvements and fixes

Changes from v2:
 - Have the I2C driver default to y so it does not need to be selected from
   ARCH_BCM_IPROC. This also helps to get rid of one patch. The driver still
   depends on ARCH_BCM_IPROC
 - Get rid of redundant check on resource returned by platform_get_resource

Changes from v1:
 - Fix function argument parenthesis
 - Get rid of redundant driver owner field

Ray Jui (3):
  i2c: iProc: define Broadcom iProc I2C binding
  i2c: iproc: Add Broadcom iProc I2C Driver
  ARM: dts: add I2C device nodes for Broadcom Cygnus

 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   20 +
 drivers/i2c/busses/Kconfig                         |   10 +
 drivers/i2c/busses/Makefile                        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c                 |  499 ++++++++++++++++++++
 5 files changed, 567 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

-- 
1.7.9.5

[PATCH v6 1/3] i2c: iProc: define Broadcom iProc I2C binding

[Ray Jui]

Document the I2C device tree binding for Broadcom iProc family of
SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt

diff --git a/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
new file mode 100644
index 0000000..81f982c
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
@@ -0,0 +1,37 @@
+Broadcom iProc I2C controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,iproc-i2c"
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+    I2C controller registers
+
+- interrupts:
+    Should contain the I2C interrupt
+
+- clock-frequency:
+    This is the I2C bus clock. Need to be either 100000 or 400000
+
+- #address-cells:
+    Always 1 (for I2C addresses)
+
+- #size-cells:
+    Always 0
+
+Example:
+	i2c0: i2c@18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+
+		codec: wm8750@1a {
+			compatible = "wlf,wm8750";
+			reg = <0x1a>;
+		};
+	};
-- 
1.7.9.5

[PATCH v6 1/3] i2c: iProc: define Broadcom iProc I2C binding

[Ray Jui]

Document the I2C device tree binding for Broadcom iProc family of
SoCs

Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
---
 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt

diff --git a/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
new file mode 100644
index 0000000..81f982c
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
@@ -0,0 +1,37 @@
+Broadcom iProc I2C controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,iproc-i2c"
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+    I2C controller registers
+
+- interrupts:
+    Should contain the I2C interrupt
+
+- clock-frequency:
+    This is the I2C bus clock. Need to be either 100000 or 400000
+
+- #address-cells:
+    Always 1 (for I2C addresses)
+
+- #size-cells:
+    Always 0
+
+Example:
+	i2c0: i2c@18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+
+		codec: wm8750@1a {
+			compatible = "wlf,wm8750";
+			reg = <0x1a>;
+		};
+	};
-- 
1.7.9.5

--
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[PATCH v6 1/3] i2c: iProc: define Broadcom iProc I2C binding

[Ray Jui]

Document the I2C device tree binding for Broadcom iProc family of
SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt

diff --git a/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
new file mode 100644
index 0000000..81f982c
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
@@ -0,0 +1,37 @@
+Broadcom iProc I2C controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,iproc-i2c"
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+    I2C controller registers
+
+- interrupts:
+    Should contain the I2C interrupt
+
+- clock-frequency:
+    This is the I2C bus clock. Need to be either 100000 or 400000
+
+- #address-cells:
+    Always 1 (for I2C addresses)
+
+- #size-cells:
+    Always 0
+
+Example:
+	i2c0: i2c at 18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+
+		codec: wm8750 at 1a {
+			compatible = "wlf,wm8750";
+			reg = <0x1a>;
+		};
+	};
-- 
1.7.9.5

[PATCH v6 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

Add initial support to the Broadcom iProc I2C controller found in the
iProc family of SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has
a size of 64 bytes. The iProc I2C controller supports two bus speeds
including standard mode (100kHz) and fast mode (400kHz)

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/i2c/busses/Kconfig         |   10 +
 drivers/i2c/busses/Makefile        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c |  499 ++++++++++++++++++++++++++++++++++++
 3 files changed, 510 insertions(+)
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 31e8308..af76d23 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -372,6 +372,16 @@ config I2C_BCM2835
 	  This support is also available as a module.  If so, the module
 	  will be called i2c-bcm2835.
 
+config I2C_BCM_IPROC
+	tristate "Broadcom iProc I2C controller"
+	depends on ARCH_BCM_IPROC || COMPILE_TEST
+	default ARCH_BCM_IPROC
+	help
+	  If you say yes to this option, support will be included for the
+	  Broadcom iProc I2C controller.
+
+	  If you don't know what to do here, say N.
+
 config I2C_BCM_KONA
 	tristate "BCM Kona I2C adapter"
 	depends on ARCH_BCM_MOBILE
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 56388f6..d93b509 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
 obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
 obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
 obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
+obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
 obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
 obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
 obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
new file mode 100644
index 0000000..1ebacd7
--- /dev/null
+++ b/drivers/i2c/busses/i2c-bcm-iproc.c
@@ -0,0 +1,499 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+
+#define CFG_OFFSET                   0x00
+#define CFG_RESET_SHIFT              31
+#define CFG_EN_SHIFT                 30
+#define CFG_M_RETRY_CNT_SHIFT        16
+#define CFG_M_RETRY_CNT_MASK         0x0f
+
+#define TIM_CFG_OFFSET               0x04
+#define TIM_CFG_MODE_400_SHIFT       31
+
+#define M_FIFO_CTRL_OFFSET           0x0c
+#define M_FIFO_RX_FLUSH_SHIFT        31
+#define M_FIFO_TX_FLUSH_SHIFT        30
+#define M_FIFO_RX_CNT_SHIFT          16
+#define M_FIFO_RX_CNT_MASK           0x7f
+#define M_FIFO_RX_THLD_SHIFT         8
+#define M_FIFO_RX_THLD_MASK          0x3f
+
+#define M_CMD_OFFSET                 0x30
+#define M_CMD_START_BUSY_SHIFT       31
+#define M_CMD_STATUS_SHIFT           25
+#define M_CMD_STATUS_MASK            0x07
+#define M_CMD_STATUS_SUCCESS         0x0
+#define M_CMD_STATUS_LOST_ARB        0x1
+#define M_CMD_STATUS_NACK_ADDR       0x2
+#define M_CMD_STATUS_NACK_DATA       0x3
+#define M_CMD_STATUS_TIMEOUT         0x4
+#define M_CMD_PROTOCOL_SHIFT         9
+#define M_CMD_PROTOCOL_MASK          0xf
+#define M_CMD_PROTOCOL_BLK_WR        0x7
+#define M_CMD_PROTOCOL_BLK_RD        0x8
+#define M_CMD_PEC_SHIFT              8
+#define M_CMD_RD_CNT_SHIFT           0
+#define M_CMD_RD_CNT_MASK            0xff
+
+#define IE_OFFSET                    0x38
+#define IE_M_RX_FIFO_FULL_SHIFT      31
+#define IE_M_RX_THLD_SHIFT           30
+#define IE_M_START_BUSY_SHIFT        28
+
+#define IS_OFFSET                    0x3c
+#define IS_M_RX_FIFO_FULL_SHIFT      31
+#define IS_M_RX_THLD_SHIFT           30
+#define IS_M_START_BUSY_SHIFT        28
+
+#define M_TX_OFFSET                  0x40
+#define M_TX_WR_STATUS_SHIFT         31
+#define M_TX_DATA_SHIFT              0
+#define M_TX_DATA_MASK               0xff
+
+#define M_RX_OFFSET                  0x44
+#define M_RX_STATUS_SHIFT            30
+#define M_RX_STATUS_MASK             0x03
+#define M_RX_PEC_ERR_SHIFT           29
+#define M_RX_DATA_SHIFT              0
+#define M_RX_DATA_MASK               0xff
+
+#define I2C_TIMEOUT_MESC             100
+#define M_TX_RX_FIFO_SIZE            64
+
+enum bus_speed_index {
+	I2C_SPD_100K = 0,
+	I2C_SPD_400K,
+};
+
+struct bcm_iproc_i2c_dev {
+	struct device *device;
+	int irq;
+
+	void __iomem *base;
+
+	struct i2c_adapter adapter;
+
+	struct completion done;
+	atomic_t xfer_is_done;
+};
+
+/*
+ * Can be expanded in the future if more interrupt status bits are utilized
+ */
+#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
+
+static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = data;
+	u32 status = readl(iproc_i2c->base + IS_OFFSET);
+
+	status &= ISR_MASK;
+
+	if (!status)
+		return IRQ_NONE;
+
+	writel(status, iproc_i2c->base + IS_OFFSET);
+	atomic_set(&iproc_i2c->xfer_is_done, 1);
+	complete_all(&iproc_i2c->done);
+
+	return IRQ_HANDLED;
+}
+
+static bool bcm_iproc_i2c_bus_busy(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	if (readl(iproc_i2c->base + M_CMD_OFFSET) &
+	    (1 << M_CMD_START_BUSY_SHIFT))
+		return true;
+	else
+		return false;
+}
+
+static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *iproc_i2c,
+				     struct i2c_msg *msg, u8 *addr)
+{
+
+	if (msg->flags & I2C_M_TEN) {
+		dev_err(iproc_i2c->device, "no support for 10-bit address\n");
+		return -EINVAL;
+	}
+
+	*addr = msg->addr << 1;
+
+	if (msg->flags & I2C_M_RD)
+		*addr |= 1;
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *iproc_i2c,
+				      struct i2c_msg *msg)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + M_CMD_OFFSET);
+	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
+
+	switch (val) {
+	case M_CMD_STATUS_SUCCESS:
+		return 0;
+
+	case M_CMD_STATUS_LOST_ARB:
+		dev_dbg(iproc_i2c->device, "lost bus arbitration\n");
+		return -EAGAIN;
+
+	case M_CMD_STATUS_NACK_ADDR:
+		dev_dbg(iproc_i2c->device, "NAK addr:0x%02x\n", msg->addr);
+		return -ENXIO;
+
+	case M_CMD_STATUS_NACK_DATA:
+		dev_dbg(iproc_i2c->device, "NAK data\n");
+		return -ENXIO;
+
+	case M_CMD_STATUS_TIMEOUT:
+		dev_dbg(iproc_i2c->device, "bus timeout\n");
+		return -ETIMEDOUT;
+
+	default:
+		dev_dbg(iproc_i2c->device, "unknown error code=%d\n", val);
+		return -EIO;
+	}
+}
+
+static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *iproc_i2c,
+					 struct i2c_msg *msg)
+{
+	int ret, i;
+	u8 addr;
+	u32 val;
+	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	if (msg->len > M_TX_RX_FIFO_SIZE - 1) {
+		dev_err(iproc_i2c->device,
+			"only support data length up to %u bytes\n",
+			M_TX_RX_FIFO_SIZE - 1);
+		return -EINVAL;
+	}
+
+	if (bcm_iproc_i2c_bus_busy(iproc_i2c)) {
+		dev_warn(iproc_i2c->device, "bus is busy\n");
+		return -EBUSY;
+	}
+
+	ret = bcm_iproc_i2c_format_addr(iproc_i2c, msg, &addr);
+	if (ret)
+		return ret;
+
+	/* load slave address into the TX FIFO */
+	writel(addr, iproc_i2c->base + M_TX_OFFSET);
+
+	/* for a write transaction, load data into the TX FIFO */
+	if (!(msg->flags & I2C_M_RD)) {
+		for (i = 0; i < msg->len; i++) {
+			val = msg->buf[i];
+
+			/* mark the last byte */
+			if (i == msg->len - 1)
+				val |= 1 << M_TX_WR_STATUS_SHIFT;
+
+			writel(val, iproc_i2c->base + M_TX_OFFSET);
+		}
+
+		if (msg->len == 0)
+			writel(1 << M_TX_WR_STATUS_SHIFT,
+			       iproc_i2c->base + M_TX_OFFSET);
+	}
+
+	/* mark as incomplete before starting the transaction */
+	reinit_completion(&iproc_i2c->done);
+	atomic_set(&iproc_i2c->xfer_is_done, 0);
+
+	/*
+	 * Enable the "start busy" interrupt, which will be triggered after the
+	 * transaction is done, i.e., the internal start_busy bit, transitions
+	 * from 1 to 0.
+	 */
+	writel(1 << IE_M_START_BUSY_SHIFT, iproc_i2c->base + IE_OFFSET);
+
+	/*
+	 * Now we can activate the transfer. For a read operation, specify the
+	 * number of bytes to read
+	 */
+	val = 1 << M_CMD_START_BUSY_SHIFT;
+	if (msg->flags & I2C_M_RD) {
+		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
+		       (msg->len << M_CMD_RD_CNT_SHIFT);
+	} else {
+		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
+	}
+	writel(val, iproc_i2c->base + M_CMD_OFFSET);
+
+	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+
+	if (!time_left && !atomic_read(&iproc_i2c->xfer_is_done)) {
+		dev_err(iproc_i2c->device, "transaction timed out\n");
+
+		/* flush FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return -ETIMEDOUT;
+	}
+
+	ret = bcm_iproc_i2c_check_status(iproc_i2c, msg);
+	if (ret) {
+		/* flush both TX/RX FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return ret;
+	}
+
+	/*
+	 * For a read operation, we now need to load the data from FIFO
+	 * into the memory buffer
+	 */
+	if (msg->flags & I2C_M_RD) {
+		for (i = 0; i < msg->len; i++) {
+			msg->buf[i] = (readl(iproc_i2c->base + M_RX_OFFSET) >>
+				      M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
+		}
+	}
+
+	dev_dbg(iproc_i2c->device, "xfer %c, addr=0x%02x, len=%d\n",
+		(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
+		msg->len);
+	dev_dbg(iproc_i2c->device, "**** data start ****\n");
+	for (i = 0; i < msg->len; i++)
+		dev_dbg(iproc_i2c->device, "0x%02x ",  msg->buf[i]);
+	dev_dbg(iproc_i2c->device, "**** data end ****\n");
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
+			      struct i2c_msg msgs[], int num)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = i2c_get_adapdata(adapter);
+	int ret, i;
+
+	/* go through all messages */
+	for (i = 0; i < num; i++) {
+		ret = bcm_iproc_i2c_xfer_single_msg(iproc_i2c, &msgs[i]);
+		if (ret) {
+			dev_err(iproc_i2c->device, "xfer failed\n");
+			return ret;
+		}
+	}
+
+	return num;
+}
+
+static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm bcm_iproc_algo = {
+	.master_xfer = bcm_iproc_i2c_xfer,
+	.functionality = bcm_iproc_i2c_functionality,
+};
+
+static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	unsigned int bus_speed, speed_bit;
+	u32 val;
+	int ret = of_property_read_u32(iproc_i2c->device->of_node,
+				       "clock-frequency", &bus_speed);
+	if (ret < 0) {
+		dev_info(iproc_i2c->device,
+			"unable to interpret clock-frequency DT property\n");
+		bus_speed = 100000;
+	}
+
+	if (bus_speed < 100000) {
+		dev_err(iproc_i2c->device, "%d Hz bus speed not supported\n",
+			bus_speed);
+		dev_err(iproc_i2c->device,
+			"valid speeds are 100khz and 400khz\n");
+		return -EINVAL;
+	} else if (bus_speed < 400000) {
+		speed_bit = 0;
+	} else {
+		/* bus_speed >= 400000 */
+		speed_bit = 1;
+	}
+
+	val = readl(iproc_i2c->base + TIM_CFG_OFFSET);
+	val &= ~(1 << TIM_CFG_MODE_400_SHIFT);
+	val |= speed_bit << TIM_CFG_MODE_400_SHIFT;
+	writel(val, iproc_i2c->base + TIM_CFG_OFFSET);
+
+	dev_info(iproc_i2c->device, "bus set to %u Hz\n", bus_speed);
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	/* put controller in reset */
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val |= 1 << CFG_RESET_SHIFT;
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* wait 100 usec per spec */
+	udelay(100);
+
+	/* bring controller out of reset */
+	val &= ~(1 << CFG_RESET_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
+	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
+	writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+
+	/* clear all pending interrupts */
+	writel(0xffffffff, iproc_i2c->base + IS_OFFSET);
+
+	return 0;
+}
+
+static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val |= 1 << CFG_EN_SHIFT;
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+}
+
+static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+}
+
+static int bcm_iproc_i2c_probe(struct platform_device *pdev)
+{
+	int irq, ret = 0;
+	struct bcm_iproc_i2c_dev *iproc_i2c;
+	struct i2c_adapter *adap;
+	struct resource *res;
+
+	iproc_i2c = devm_kzalloc(&pdev->dev, sizeof(*iproc_i2c),
+				 GFP_KERNEL);
+	if (!iproc_i2c)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, iproc_i2c);
+	iproc_i2c->device = &pdev->dev;
+	init_completion(&iproc_i2c->done);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	iproc_i2c->base = devm_ioremap_resource(iproc_i2c->device, res);
+	if (IS_ERR(iproc_i2c->base))
+		return PTR_ERR(iproc_i2c->base);
+
+	ret = bcm_iproc_i2c_init(iproc_i2c);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_cfg_speed(iproc_i2c);
+	if (ret)
+		return ret;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq <= 0) {
+		dev_err(iproc_i2c->device, "no irq resource\n");
+		return irq;
+	}
+	iproc_i2c->irq = irq;
+
+	ret = devm_request_irq(iproc_i2c->device, irq, bcm_iproc_i2c_isr, 0,
+			       pdev->name, iproc_i2c);
+	if (ret < 0) {
+		dev_err(iproc_i2c->device, "unable to request irq %i\n", irq);
+		return ret;
+	}
+
+	bcm_iproc_i2c_enable(iproc_i2c);
+
+	adap = &iproc_i2c->adapter;
+	i2c_set_adapdata(adap, iproc_i2c);
+	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
+	adap->algo = &bcm_iproc_algo;
+	adap->dev.parent = &pdev->dev;
+	adap->dev.of_node = pdev->dev.of_node;
+
+	ret = i2c_add_adapter(adap);
+	if (ret) {
+		dev_err(iproc_i2c->device, "failed to add adapter\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_remove(struct platform_device *pdev)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
+
+	/* make sure there's no pending interrupt when we remove the adapter */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+	synchronize_irq(iproc_i2c->irq);
+
+	i2c_del_adapter(&iproc_i2c->adapter);
+	bcm_iproc_i2c_disable(iproc_i2c);
+
+	return 0;
+}
+
+static const struct of_device_id bcm_iproc_i2c_of_match[] = {
+	{ .compatible = "brcm,iproc-i2c" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
+
+static struct platform_driver bcm_iproc_i2c_driver = {
+	.driver = {
+		.name = "bcm-iproc-i2c",
+		.of_match_table = bcm_iproc_i2c_of_match,
+	},
+	.probe = bcm_iproc_i2c_probe,
+	.remove = bcm_iproc_i2c_remove,
+};
+module_platform_driver(bcm_iproc_i2c_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v6 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

Add initial support to the Broadcom iProc I2C controller found in the
iProc family of SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has
a size of 64 bytes. The iProc I2C controller supports two bus speeds
including standard mode (100kHz) and fast mode (400kHz)

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/i2c/busses/Kconfig         |   10 +
 drivers/i2c/busses/Makefile        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c |  499 ++++++++++++++++++++++++++++++++++++
 3 files changed, 510 insertions(+)
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 31e8308..af76d23 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -372,6 +372,16 @@ config I2C_BCM2835
 	  This support is also available as a module.  If so, the module
 	  will be called i2c-bcm2835.
 
+config I2C_BCM_IPROC
+	tristate "Broadcom iProc I2C controller"
+	depends on ARCH_BCM_IPROC || COMPILE_TEST
+	default ARCH_BCM_IPROC
+	help
+	  If you say yes to this option, support will be included for the
+	  Broadcom iProc I2C controller.
+
+	  If you don't know what to do here, say N.
+
 config I2C_BCM_KONA
 	tristate "BCM Kona I2C adapter"
 	depends on ARCH_BCM_MOBILE
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 56388f6..d93b509 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
 obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
 obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
 obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
+obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
 obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
 obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
 obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
new file mode 100644
index 0000000..1ebacd7
--- /dev/null
+++ b/drivers/i2c/busses/i2c-bcm-iproc.c
@@ -0,0 +1,499 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+
+#define CFG_OFFSET                   0x00
+#define CFG_RESET_SHIFT              31
+#define CFG_EN_SHIFT                 30
+#define CFG_M_RETRY_CNT_SHIFT        16
+#define CFG_M_RETRY_CNT_MASK         0x0f
+
+#define TIM_CFG_OFFSET               0x04
+#define TIM_CFG_MODE_400_SHIFT       31
+
+#define M_FIFO_CTRL_OFFSET           0x0c
+#define M_FIFO_RX_FLUSH_SHIFT        31
+#define M_FIFO_TX_FLUSH_SHIFT        30
+#define M_FIFO_RX_CNT_SHIFT          16
+#define M_FIFO_RX_CNT_MASK           0x7f
+#define M_FIFO_RX_THLD_SHIFT         8
+#define M_FIFO_RX_THLD_MASK          0x3f
+
+#define M_CMD_OFFSET                 0x30
+#define M_CMD_START_BUSY_SHIFT       31
+#define M_CMD_STATUS_SHIFT           25
+#define M_CMD_STATUS_MASK            0x07
+#define M_CMD_STATUS_SUCCESS         0x0
+#define M_CMD_STATUS_LOST_ARB        0x1
+#define M_CMD_STATUS_NACK_ADDR       0x2
+#define M_CMD_STATUS_NACK_DATA       0x3
+#define M_CMD_STATUS_TIMEOUT         0x4
+#define M_CMD_PROTOCOL_SHIFT         9
+#define M_CMD_PROTOCOL_MASK          0xf
+#define M_CMD_PROTOCOL_BLK_WR        0x7
+#define M_CMD_PROTOCOL_BLK_RD        0x8
+#define M_CMD_PEC_SHIFT              8
+#define M_CMD_RD_CNT_SHIFT           0
+#define M_CMD_RD_CNT_MASK            0xff
+
+#define IE_OFFSET                    0x38
+#define IE_M_RX_FIFO_FULL_SHIFT      31
+#define IE_M_RX_THLD_SHIFT           30
+#define IE_M_START_BUSY_SHIFT        28
+
+#define IS_OFFSET                    0x3c
+#define IS_M_RX_FIFO_FULL_SHIFT      31
+#define IS_M_RX_THLD_SHIFT           30
+#define IS_M_START_BUSY_SHIFT        28
+
+#define M_TX_OFFSET                  0x40
+#define M_TX_WR_STATUS_SHIFT         31
+#define M_TX_DATA_SHIFT              0
+#define M_TX_DATA_MASK               0xff
+
+#define M_RX_OFFSET                  0x44
+#define M_RX_STATUS_SHIFT            30
+#define M_RX_STATUS_MASK             0x03
+#define M_RX_PEC_ERR_SHIFT           29
+#define M_RX_DATA_SHIFT              0
+#define M_RX_DATA_MASK               0xff
+
+#define I2C_TIMEOUT_MESC             100
+#define M_TX_RX_FIFO_SIZE            64
+
+enum bus_speed_index {
+	I2C_SPD_100K = 0,
+	I2C_SPD_400K,
+};
+
+struct bcm_iproc_i2c_dev {
+	struct device *device;
+	int irq;
+
+	void __iomem *base;
+
+	struct i2c_adapter adapter;
+
+	struct completion done;
+	atomic_t xfer_is_done;
+};
+
+/*
+ * Can be expanded in the future if more interrupt status bits are utilized
+ */
+#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
+
+static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = data;
+	u32 status = readl(iproc_i2c->base + IS_OFFSET);
+
+	status &= ISR_MASK;
+
+	if (!status)
+		return IRQ_NONE;
+
+	writel(status, iproc_i2c->base + IS_OFFSET);
+	atomic_set(&iproc_i2c->xfer_is_done, 1);
+	complete_all(&iproc_i2c->done);
+
+	return IRQ_HANDLED;
+}
+
+static bool bcm_iproc_i2c_bus_busy(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	if (readl(iproc_i2c->base + M_CMD_OFFSET) &
+	    (1 << M_CMD_START_BUSY_SHIFT))
+		return true;
+	else
+		return false;
+}
+
+static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *iproc_i2c,
+				     struct i2c_msg *msg, u8 *addr)
+{
+
+	if (msg->flags & I2C_M_TEN) {
+		dev_err(iproc_i2c->device, "no support for 10-bit address\n");
+		return -EINVAL;
+	}
+
+	*addr = msg->addr << 1;
+
+	if (msg->flags & I2C_M_RD)
+		*addr |= 1;
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *iproc_i2c,
+				      struct i2c_msg *msg)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + M_CMD_OFFSET);
+	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
+
+	switch (val) {
+	case M_CMD_STATUS_SUCCESS:
+		return 0;
+
+	case M_CMD_STATUS_LOST_ARB:
+		dev_dbg(iproc_i2c->device, "lost bus arbitration\n");
+		return -EAGAIN;
+
+	case M_CMD_STATUS_NACK_ADDR:
+		dev_dbg(iproc_i2c->device, "NAK addr:0x%02x\n", msg->addr);
+		return -ENXIO;
+
+	case M_CMD_STATUS_NACK_DATA:
+		dev_dbg(iproc_i2c->device, "NAK data\n");
+		return -ENXIO;
+
+	case M_CMD_STATUS_TIMEOUT:
+		dev_dbg(iproc_i2c->device, "bus timeout\n");
+		return -ETIMEDOUT;
+
+	default:
+		dev_dbg(iproc_i2c->device, "unknown error code=%d\n", val);
+		return -EIO;
+	}
+}
+
+static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *iproc_i2c,
+					 struct i2c_msg *msg)
+{
+	int ret, i;
+	u8 addr;
+	u32 val;
+	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	if (msg->len > M_TX_RX_FIFO_SIZE - 1) {
+		dev_err(iproc_i2c->device,
+			"only support data length up to %u bytes\n",
+			M_TX_RX_FIFO_SIZE - 1);
+		return -EINVAL;
+	}
+
+	if (bcm_iproc_i2c_bus_busy(iproc_i2c)) {
+		dev_warn(iproc_i2c->device, "bus is busy\n");
+		return -EBUSY;
+	}
+
+	ret = bcm_iproc_i2c_format_addr(iproc_i2c, msg, &addr);
+	if (ret)
+		return ret;
+
+	/* load slave address into the TX FIFO */
+	writel(addr, iproc_i2c->base + M_TX_OFFSET);
+
+	/* for a write transaction, load data into the TX FIFO */
+	if (!(msg->flags & I2C_M_RD)) {
+		for (i = 0; i < msg->len; i++) {
+			val = msg->buf[i];
+
+			/* mark the last byte */
+			if (i == msg->len - 1)
+				val |= 1 << M_TX_WR_STATUS_SHIFT;
+
+			writel(val, iproc_i2c->base + M_TX_OFFSET);
+		}
+
+		if (msg->len == 0)
+			writel(1 << M_TX_WR_STATUS_SHIFT,
+			       iproc_i2c->base + M_TX_OFFSET);
+	}
+
+	/* mark as incomplete before starting the transaction */
+	reinit_completion(&iproc_i2c->done);
+	atomic_set(&iproc_i2c->xfer_is_done, 0);
+
+	/*
+	 * Enable the "start busy" interrupt, which will be triggered after the
+	 * transaction is done, i.e., the internal start_busy bit, transitions
+	 * from 1 to 0.
+	 */
+	writel(1 << IE_M_START_BUSY_SHIFT, iproc_i2c->base + IE_OFFSET);
+
+	/*
+	 * Now we can activate the transfer. For a read operation, specify the
+	 * number of bytes to read
+	 */
+	val = 1 << M_CMD_START_BUSY_SHIFT;
+	if (msg->flags & I2C_M_RD) {
+		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
+		       (msg->len << M_CMD_RD_CNT_SHIFT);
+	} else {
+		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
+	}
+	writel(val, iproc_i2c->base + M_CMD_OFFSET);
+
+	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+
+	if (!time_left && !atomic_read(&iproc_i2c->xfer_is_done)) {
+		dev_err(iproc_i2c->device, "transaction timed out\n");
+
+		/* flush FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return -ETIMEDOUT;
+	}
+
+	ret = bcm_iproc_i2c_check_status(iproc_i2c, msg);
+	if (ret) {
+		/* flush both TX/RX FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return ret;
+	}
+
+	/*
+	 * For a read operation, we now need to load the data from FIFO
+	 * into the memory buffer
+	 */
+	if (msg->flags & I2C_M_RD) {
+		for (i = 0; i < msg->len; i++) {
+			msg->buf[i] = (readl(iproc_i2c->base + M_RX_OFFSET) >>
+				      M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
+		}
+	}
+
+	dev_dbg(iproc_i2c->device, "xfer %c, addr=0x%02x, len=%d\n",
+		(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
+		msg->len);
+	dev_dbg(iproc_i2c->device, "**** data start ****\n");
+	for (i = 0; i < msg->len; i++)
+		dev_dbg(iproc_i2c->device, "0x%02x ",  msg->buf[i]);
+	dev_dbg(iproc_i2c->device, "**** data end ****\n");
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
+			      struct i2c_msg msgs[], int num)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = i2c_get_adapdata(adapter);
+	int ret, i;
+
+	/* go through all messages */
+	for (i = 0; i < num; i++) {
+		ret = bcm_iproc_i2c_xfer_single_msg(iproc_i2c, &msgs[i]);
+		if (ret) {
+			dev_err(iproc_i2c->device, "xfer failed\n");
+			return ret;
+		}
+	}
+
+	return num;
+}
+
+static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm bcm_iproc_algo = {
+	.master_xfer = bcm_iproc_i2c_xfer,
+	.functionality = bcm_iproc_i2c_functionality,
+};
+
+static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	unsigned int bus_speed, speed_bit;
+	u32 val;
+	int ret = of_property_read_u32(iproc_i2c->device->of_node,
+				       "clock-frequency", &bus_speed);
+	if (ret < 0) {
+		dev_info(iproc_i2c->device,
+			"unable to interpret clock-frequency DT property\n");
+		bus_speed = 100000;
+	}
+
+	if (bus_speed < 100000) {
+		dev_err(iproc_i2c->device, "%d Hz bus speed not supported\n",
+			bus_speed);
+		dev_err(iproc_i2c->device,
+			"valid speeds are 100khz and 400khz\n");
+		return -EINVAL;
+	} else if (bus_speed < 400000) {
+		speed_bit = 0;
+	} else {
+		/* bus_speed >= 400000 */
+		speed_bit = 1;
+	}
+
+	val = readl(iproc_i2c->base + TIM_CFG_OFFSET);
+	val &= ~(1 << TIM_CFG_MODE_400_SHIFT);
+	val |= speed_bit << TIM_CFG_MODE_400_SHIFT;
+	writel(val, iproc_i2c->base + TIM_CFG_OFFSET);
+
+	dev_info(iproc_i2c->device, "bus set to %u Hz\n", bus_speed);
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	/* put controller in reset */
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val |= 1 << CFG_RESET_SHIFT;
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* wait 100 usec per spec */
+	udelay(100);
+
+	/* bring controller out of reset */
+	val &= ~(1 << CFG_RESET_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
+	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
+	writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+
+	/* clear all pending interrupts */
+	writel(0xffffffff, iproc_i2c->base + IS_OFFSET);
+
+	return 0;
+}
+
+static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val |= 1 << CFG_EN_SHIFT;
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+}
+
+static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+}
+
+static int bcm_iproc_i2c_probe(struct platform_device *pdev)
+{
+	int irq, ret = 0;
+	struct bcm_iproc_i2c_dev *iproc_i2c;
+	struct i2c_adapter *adap;
+	struct resource *res;
+
+	iproc_i2c = devm_kzalloc(&pdev->dev, sizeof(*iproc_i2c),
+				 GFP_KERNEL);
+	if (!iproc_i2c)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, iproc_i2c);
+	iproc_i2c->device = &pdev->dev;
+	init_completion(&iproc_i2c->done);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	iproc_i2c->base = devm_ioremap_resource(iproc_i2c->device, res);
+	if (IS_ERR(iproc_i2c->base))
+		return PTR_ERR(iproc_i2c->base);
+
+	ret = bcm_iproc_i2c_init(iproc_i2c);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_cfg_speed(iproc_i2c);
+	if (ret)
+		return ret;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq <= 0) {
+		dev_err(iproc_i2c->device, "no irq resource\n");
+		return irq;
+	}
+	iproc_i2c->irq = irq;
+
+	ret = devm_request_irq(iproc_i2c->device, irq, bcm_iproc_i2c_isr, 0,
+			       pdev->name, iproc_i2c);
+	if (ret < 0) {
+		dev_err(iproc_i2c->device, "unable to request irq %i\n", irq);
+		return ret;
+	}
+
+	bcm_iproc_i2c_enable(iproc_i2c);
+
+	adap = &iproc_i2c->adapter;
+	i2c_set_adapdata(adap, iproc_i2c);
+	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
+	adap->algo = &bcm_iproc_algo;
+	adap->dev.parent = &pdev->dev;
+	adap->dev.of_node = pdev->dev.of_node;
+
+	ret = i2c_add_adapter(adap);
+	if (ret) {
+		dev_err(iproc_i2c->device, "failed to add adapter\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_remove(struct platform_device *pdev)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
+
+	/* make sure there's no pending interrupt when we remove the adapter */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+	synchronize_irq(iproc_i2c->irq);
+
+	i2c_del_adapter(&iproc_i2c->adapter);
+	bcm_iproc_i2c_disable(iproc_i2c);
+
+	return 0;
+}
+
+static const struct of_device_id bcm_iproc_i2c_of_match[] = {
+	{ .compatible = "brcm,iproc-i2c" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
+
+static struct platform_driver bcm_iproc_i2c_driver = {
+	.driver = {
+		.name = "bcm-iproc-i2c",
+		.of_match_table = bcm_iproc_i2c_of_match,
+	},
+	.probe = bcm_iproc_i2c_probe,
+	.remove = bcm_iproc_i2c_remove,
+};
+module_platform_driver(bcm_iproc_i2c_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v6 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

Add initial support to the Broadcom iProc I2C controller found in the
iProc family of SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has
a size of 64 bytes. The iProc I2C controller supports two bus speeds
including standard mode (100kHz) and fast mode (400kHz)

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/i2c/busses/Kconfig         |   10 +
 drivers/i2c/busses/Makefile        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c |  499 ++++++++++++++++++++++++++++++++++++
 3 files changed, 510 insertions(+)
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 31e8308..af76d23 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -372,6 +372,16 @@ config I2C_BCM2835
 	  This support is also available as a module.  If so, the module
 	  will be called i2c-bcm2835.
 
+config I2C_BCM_IPROC
+	tristate "Broadcom iProc I2C controller"
+	depends on ARCH_BCM_IPROC || COMPILE_TEST
+	default ARCH_BCM_IPROC
+	help
+	  If you say yes to this option, support will be included for the
+	  Broadcom iProc I2C controller.
+
+	  If you don't know what to do here, say N.
+
 config I2C_BCM_KONA
 	tristate "BCM Kona I2C adapter"
 	depends on ARCH_BCM_MOBILE
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 56388f6..d93b509 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
 obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
 obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
 obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
+obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
 obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
 obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
 obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
new file mode 100644
index 0000000..1ebacd7
--- /dev/null
+++ b/drivers/i2c/busses/i2c-bcm-iproc.c
@@ -0,0 +1,499 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+
+#define CFG_OFFSET                   0x00
+#define CFG_RESET_SHIFT              31
+#define CFG_EN_SHIFT                 30
+#define CFG_M_RETRY_CNT_SHIFT        16
+#define CFG_M_RETRY_CNT_MASK         0x0f
+
+#define TIM_CFG_OFFSET               0x04
+#define TIM_CFG_MODE_400_SHIFT       31
+
+#define M_FIFO_CTRL_OFFSET           0x0c
+#define M_FIFO_RX_FLUSH_SHIFT        31
+#define M_FIFO_TX_FLUSH_SHIFT        30
+#define M_FIFO_RX_CNT_SHIFT          16
+#define M_FIFO_RX_CNT_MASK           0x7f
+#define M_FIFO_RX_THLD_SHIFT         8
+#define M_FIFO_RX_THLD_MASK          0x3f
+
+#define M_CMD_OFFSET                 0x30
+#define M_CMD_START_BUSY_SHIFT       31
+#define M_CMD_STATUS_SHIFT           25
+#define M_CMD_STATUS_MASK            0x07
+#define M_CMD_STATUS_SUCCESS         0x0
+#define M_CMD_STATUS_LOST_ARB        0x1
+#define M_CMD_STATUS_NACK_ADDR       0x2
+#define M_CMD_STATUS_NACK_DATA       0x3
+#define M_CMD_STATUS_TIMEOUT         0x4
+#define M_CMD_PROTOCOL_SHIFT         9
+#define M_CMD_PROTOCOL_MASK          0xf
+#define M_CMD_PROTOCOL_BLK_WR        0x7
+#define M_CMD_PROTOCOL_BLK_RD        0x8
+#define M_CMD_PEC_SHIFT              8
+#define M_CMD_RD_CNT_SHIFT           0
+#define M_CMD_RD_CNT_MASK            0xff
+
+#define IE_OFFSET                    0x38
+#define IE_M_RX_FIFO_FULL_SHIFT      31
+#define IE_M_RX_THLD_SHIFT           30
+#define IE_M_START_BUSY_SHIFT        28
+
+#define IS_OFFSET                    0x3c
+#define IS_M_RX_FIFO_FULL_SHIFT      31
+#define IS_M_RX_THLD_SHIFT           30
+#define IS_M_START_BUSY_SHIFT        28
+
+#define M_TX_OFFSET                  0x40
+#define M_TX_WR_STATUS_SHIFT         31
+#define M_TX_DATA_SHIFT              0
+#define M_TX_DATA_MASK               0xff
+
+#define M_RX_OFFSET                  0x44
+#define M_RX_STATUS_SHIFT            30
+#define M_RX_STATUS_MASK             0x03
+#define M_RX_PEC_ERR_SHIFT           29
+#define M_RX_DATA_SHIFT              0
+#define M_RX_DATA_MASK               0xff
+
+#define I2C_TIMEOUT_MESC             100
+#define M_TX_RX_FIFO_SIZE            64
+
+enum bus_speed_index {
+	I2C_SPD_100K = 0,
+	I2C_SPD_400K,
+};
+
+struct bcm_iproc_i2c_dev {
+	struct device *device;
+	int irq;
+
+	void __iomem *base;
+
+	struct i2c_adapter adapter;
+
+	struct completion done;
+	atomic_t xfer_is_done;
+};
+
+/*
+ * Can be expanded in the future if more interrupt status bits are utilized
+ */
+#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
+
+static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = data;
+	u32 status = readl(iproc_i2c->base + IS_OFFSET);
+
+	status &= ISR_MASK;
+
+	if (!status)
+		return IRQ_NONE;
+
+	writel(status, iproc_i2c->base + IS_OFFSET);
+	atomic_set(&iproc_i2c->xfer_is_done, 1);
+	complete_all(&iproc_i2c->done);
+
+	return IRQ_HANDLED;
+}
+
+static bool bcm_iproc_i2c_bus_busy(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	if (readl(iproc_i2c->base + M_CMD_OFFSET) &
+	    (1 << M_CMD_START_BUSY_SHIFT))
+		return true;
+	else
+		return false;
+}
+
+static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *iproc_i2c,
+				     struct i2c_msg *msg, u8 *addr)
+{
+
+	if (msg->flags & I2C_M_TEN) {
+		dev_err(iproc_i2c->device, "no support for 10-bit address\n");
+		return -EINVAL;
+	}
+
+	*addr = msg->addr << 1;
+
+	if (msg->flags & I2C_M_RD)
+		*addr |= 1;
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *iproc_i2c,
+				      struct i2c_msg *msg)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + M_CMD_OFFSET);
+	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
+
+	switch (val) {
+	case M_CMD_STATUS_SUCCESS:
+		return 0;
+
+	case M_CMD_STATUS_LOST_ARB:
+		dev_dbg(iproc_i2c->device, "lost bus arbitration\n");
+		return -EAGAIN;
+
+	case M_CMD_STATUS_NACK_ADDR:
+		dev_dbg(iproc_i2c->device, "NAK addr:0x%02x\n", msg->addr);
+		return -ENXIO;
+
+	case M_CMD_STATUS_NACK_DATA:
+		dev_dbg(iproc_i2c->device, "NAK data\n");
+		return -ENXIO;
+
+	case M_CMD_STATUS_TIMEOUT:
+		dev_dbg(iproc_i2c->device, "bus timeout\n");
+		return -ETIMEDOUT;
+
+	default:
+		dev_dbg(iproc_i2c->device, "unknown error code=%d\n", val);
+		return -EIO;
+	}
+}
+
+static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *iproc_i2c,
+					 struct i2c_msg *msg)
+{
+	int ret, i;
+	u8 addr;
+	u32 val;
+	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	if (msg->len > M_TX_RX_FIFO_SIZE - 1) {
+		dev_err(iproc_i2c->device,
+			"only support data length up to %u bytes\n",
+			M_TX_RX_FIFO_SIZE - 1);
+		return -EINVAL;
+	}
+
+	if (bcm_iproc_i2c_bus_busy(iproc_i2c)) {
+		dev_warn(iproc_i2c->device, "bus is busy\n");
+		return -EBUSY;
+	}
+
+	ret = bcm_iproc_i2c_format_addr(iproc_i2c, msg, &addr);
+	if (ret)
+		return ret;
+
+	/* load slave address into the TX FIFO */
+	writel(addr, iproc_i2c->base + M_TX_OFFSET);
+
+	/* for a write transaction, load data into the TX FIFO */
+	if (!(msg->flags & I2C_M_RD)) {
+		for (i = 0; i < msg->len; i++) {
+			val = msg->buf[i];
+
+			/* mark the last byte */
+			if (i == msg->len - 1)
+				val |= 1 << M_TX_WR_STATUS_SHIFT;
+
+			writel(val, iproc_i2c->base + M_TX_OFFSET);
+		}
+
+		if (msg->len == 0)
+			writel(1 << M_TX_WR_STATUS_SHIFT,
+			       iproc_i2c->base + M_TX_OFFSET);
+	}
+
+	/* mark as incomplete before starting the transaction */
+	reinit_completion(&iproc_i2c->done);
+	atomic_set(&iproc_i2c->xfer_is_done, 0);
+
+	/*
+	 * Enable the "start busy" interrupt, which will be triggered after the
+	 * transaction is done, i.e., the internal start_busy bit, transitions
+	 * from 1 to 0.
+	 */
+	writel(1 << IE_M_START_BUSY_SHIFT, iproc_i2c->base + IE_OFFSET);
+
+	/*
+	 * Now we can activate the transfer. For a read operation, specify the
+	 * number of bytes to read
+	 */
+	val = 1 << M_CMD_START_BUSY_SHIFT;
+	if (msg->flags & I2C_M_RD) {
+		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
+		       (msg->len << M_CMD_RD_CNT_SHIFT);
+	} else {
+		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
+	}
+	writel(val, iproc_i2c->base + M_CMD_OFFSET);
+
+	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+
+	if (!time_left && !atomic_read(&iproc_i2c->xfer_is_done)) {
+		dev_err(iproc_i2c->device, "transaction timed out\n");
+
+		/* flush FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return -ETIMEDOUT;
+	}
+
+	ret = bcm_iproc_i2c_check_status(iproc_i2c, msg);
+	if (ret) {
+		/* flush both TX/RX FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return ret;
+	}
+
+	/*
+	 * For a read operation, we now need to load the data from FIFO
+	 * into the memory buffer
+	 */
+	if (msg->flags & I2C_M_RD) {
+		for (i = 0; i < msg->len; i++) {
+			msg->buf[i] = (readl(iproc_i2c->base + M_RX_OFFSET) >>
+				      M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
+		}
+	}
+
+	dev_dbg(iproc_i2c->device, "xfer %c, addr=0x%02x, len=%d\n",
+		(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
+		msg->len);
+	dev_dbg(iproc_i2c->device, "**** data start ****\n");
+	for (i = 0; i < msg->len; i++)
+		dev_dbg(iproc_i2c->device, "0x%02x ",  msg->buf[i]);
+	dev_dbg(iproc_i2c->device, "**** data end ****\n");
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
+			      struct i2c_msg msgs[], int num)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = i2c_get_adapdata(adapter);
+	int ret, i;
+
+	/* go through all messages */
+	for (i = 0; i < num; i++) {
+		ret = bcm_iproc_i2c_xfer_single_msg(iproc_i2c, &msgs[i]);
+		if (ret) {
+			dev_err(iproc_i2c->device, "xfer failed\n");
+			return ret;
+		}
+	}
+
+	return num;
+}
+
+static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm bcm_iproc_algo = {
+	.master_xfer = bcm_iproc_i2c_xfer,
+	.functionality = bcm_iproc_i2c_functionality,
+};
+
+static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	unsigned int bus_speed, speed_bit;
+	u32 val;
+	int ret = of_property_read_u32(iproc_i2c->device->of_node,
+				       "clock-frequency", &bus_speed);
+	if (ret < 0) {
+		dev_info(iproc_i2c->device,
+			"unable to interpret clock-frequency DT property\n");
+		bus_speed = 100000;
+	}
+
+	if (bus_speed < 100000) {
+		dev_err(iproc_i2c->device, "%d Hz bus speed not supported\n",
+			bus_speed);
+		dev_err(iproc_i2c->device,
+			"valid speeds are 100khz and 400khz\n");
+		return -EINVAL;
+	} else if (bus_speed < 400000) {
+		speed_bit = 0;
+	} else {
+		/* bus_speed >= 400000 */
+		speed_bit = 1;
+	}
+
+	val = readl(iproc_i2c->base + TIM_CFG_OFFSET);
+	val &= ~(1 << TIM_CFG_MODE_400_SHIFT);
+	val |= speed_bit << TIM_CFG_MODE_400_SHIFT;
+	writel(val, iproc_i2c->base + TIM_CFG_OFFSET);
+
+	dev_info(iproc_i2c->device, "bus set to %u Hz\n", bus_speed);
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	/* put controller in reset */
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val |= 1 << CFG_RESET_SHIFT;
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* wait 100 usec per spec */
+	udelay(100);
+
+	/* bring controller out of reset */
+	val &= ~(1 << CFG_RESET_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
+	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
+	writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+
+	/* clear all pending interrupts */
+	writel(0xffffffff, iproc_i2c->base + IS_OFFSET);
+
+	return 0;
+}
+
+static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val |= 1 << CFG_EN_SHIFT;
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+}
+
+static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+}
+
+static int bcm_iproc_i2c_probe(struct platform_device *pdev)
+{
+	int irq, ret = 0;
+	struct bcm_iproc_i2c_dev *iproc_i2c;
+	struct i2c_adapter *adap;
+	struct resource *res;
+
+	iproc_i2c = devm_kzalloc(&pdev->dev, sizeof(*iproc_i2c),
+				 GFP_KERNEL);
+	if (!iproc_i2c)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, iproc_i2c);
+	iproc_i2c->device = &pdev->dev;
+	init_completion(&iproc_i2c->done);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	iproc_i2c->base = devm_ioremap_resource(iproc_i2c->device, res);
+	if (IS_ERR(iproc_i2c->base))
+		return PTR_ERR(iproc_i2c->base);
+
+	ret = bcm_iproc_i2c_init(iproc_i2c);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_cfg_speed(iproc_i2c);
+	if (ret)
+		return ret;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq <= 0) {
+		dev_err(iproc_i2c->device, "no irq resource\n");
+		return irq;
+	}
+	iproc_i2c->irq = irq;
+
+	ret = devm_request_irq(iproc_i2c->device, irq, bcm_iproc_i2c_isr, 0,
+			       pdev->name, iproc_i2c);
+	if (ret < 0) {
+		dev_err(iproc_i2c->device, "unable to request irq %i\n", irq);
+		return ret;
+	}
+
+	bcm_iproc_i2c_enable(iproc_i2c);
+
+	adap = &iproc_i2c->adapter;
+	i2c_set_adapdata(adap, iproc_i2c);
+	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
+	adap->algo = &bcm_iproc_algo;
+	adap->dev.parent = &pdev->dev;
+	adap->dev.of_node = pdev->dev.of_node;
+
+	ret = i2c_add_adapter(adap);
+	if (ret) {
+		dev_err(iproc_i2c->device, "failed to add adapter\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_remove(struct platform_device *pdev)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
+
+	/* make sure there's no pending interrupt when we remove the adapter */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+	synchronize_irq(iproc_i2c->irq);
+
+	i2c_del_adapter(&iproc_i2c->adapter);
+	bcm_iproc_i2c_disable(iproc_i2c);
+
+	return 0;
+}
+
+static const struct of_device_id bcm_iproc_i2c_of_match[] = {
+	{ .compatible = "brcm,iproc-i2c" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
+
+static struct platform_driver bcm_iproc_i2c_driver = {
+	.driver = {
+		.name = "bcm-iproc-i2c",
+		.of_match_table = bcm_iproc_i2c_of_match,
+	},
+	.probe = bcm_iproc_i2c_probe,
+	.remove = bcm_iproc_i2c_remove,
+};
+module_platform_driver(bcm_iproc_i2c_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v6 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
them disabled there. Individual I2C devices can be enabled in board
specific dts file when I2C slave devices are enabled in the future

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..ff5fb6a 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -70,6 +70,26 @@
 		};
 	};
 
+	i2c0: i2c@18008000 {
+		compatible = "brcm,cygnus-iproc-i2c", "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
+	i2c1: i2c@1800b000 {
+		compatible = "brcm,cygnus-iproc-i2c", "brcm,iproc-i2c";
+		reg = <0x1800b000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 86 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
 	uart0: serial@18020000 {
 		compatible = "snps,dw-apb-uart";
 		reg = <0x18020000 0x100>;
-- 
1.7.9.5

[PATCH v6 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
them disabled there. Individual I2C devices can be enabled in board
specific dts file when I2C slave devices are enabled in the future

Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..ff5fb6a 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -70,6 +70,26 @@
 		};
 	};
 
+	i2c0: i2c@18008000 {
+		compatible = "brcm,cygnus-iproc-i2c", "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
+	i2c1: i2c@1800b000 {
+		compatible = "brcm,cygnus-iproc-i2c", "brcm,iproc-i2c";
+		reg = <0x1800b000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 86 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
 	uart0: serial@18020000 {
 		compatible = "snps,dw-apb-uart";
 		reg = <0x18020000 0x100>;
-- 
1.7.9.5

[PATCH v6 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
them disabled there. Individual I2C devices can be enabled in board
specific dts file when I2C slave devices are enabled in the future

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..ff5fb6a 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -70,6 +70,26 @@
 		};
 	};
 
+	i2c0: i2c at 18008000 {
+		compatible = "brcm,cygnus-iproc-i2c", "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
+	i2c1: i2c at 1800b000 {
+		compatible = "brcm,cygnus-iproc-i2c", "brcm,iproc-i2c";
+		reg = <0x1800b000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 86 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
 	uart0: serial at 18020000 {
 		compatible = "snps,dw-apb-uart";
 		reg = <0x18020000 0x100>;
-- 
1.7.9.5

Re: [PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Russell King - ARM Linux]

On Sat, Jan 17, 2015 at 04:30:33PM -0800, Ray Jui wrote:
> 
> 
> On 1/17/2015 2:40 PM, Russell King - ARM Linux wrote:
> > On Sat, Jan 17, 2015 at 01:26:41PM -0800, Ray Jui wrote:
> >> 	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
> >>
> >> 	/* disable all interrupts */
> >> 	writel(0, iproc_i2c->base + IE_OFFSET);
> >>
> >> 	if (!time_left && !atomic_read(&iproc_i2c->transfer_is_successful)) {
> > 
> > Why are you using atomic_read() here?
> > 
> transfer_is_successful 1) will be reset to 0 in this function (before
> kick start the I2C transfer), 2) will be set to 1 in the ISR (to signal
> completion of the I2C transfer), and 3) will be checked in this function
> here. I thought that means I should declare it volatile, because it can
> be modified in both the process context and interrupt context (and I use
> atomic because I remember Linux checkpatch warns against using volatile)?

You don't need volatile or atomic_t for that.

Rather than switching to atomic_t when seeing the checkpatch warning,
you'd do better to read Documentation/volatile-considered-harmful.txt
to understand why checkpatch issues the warning, and realise that you
don't need it for the above.

Note that in the above code, the compiler can't make an assumption
about iproc_i2c->transfer_is_successful because it can't tell whether
a called function (eg, wait_for_completion_timeout()) could modify it.

Another possible issue with the above code are these lines:

	/* disable all interrupts */
	writel(0, iproc_i2c->base + IE_OFFSET);

It would be nice to think that would hit the hardware immediately, but
that's making assumptions about hardware which are not necessary true.
Your interrupt handler could even be running on another CPU after you've
asked for that register to be written.

Depending on what you're trying to achieve here, you may need:

	/* disable all interrupts */
	writel(0, iproc_i2c->base + IE_OFFSET);
	/* read it back to ensure the write has hit */
	readl(iproc_i2c->base + IE_OFFSET);

	/* make sure the interrupt handler isn't running */
	synchronize_irq(...->irq);

if what you're trying to do is to ensure that the interrupt handler has
finished running.

-- 
FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up
according to speedtest.net.

[PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Russell King - ARM Linux]

On Sat, Jan 17, 2015 at 04:30:33PM -0800, Ray Jui wrote:
> 
> 
> On 1/17/2015 2:40 PM, Russell King - ARM Linux wrote:
> > On Sat, Jan 17, 2015 at 01:26:41PM -0800, Ray Jui wrote:
> >> 	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
> >>
> >> 	/* disable all interrupts */
> >> 	writel(0, iproc_i2c->base + IE_OFFSET);
> >>
> >> 	if (!time_left && !atomic_read(&iproc_i2c->transfer_is_successful)) {
> > 
> > Why are you using atomic_read() here?
> > 
> transfer_is_successful 1) will be reset to 0 in this function (before
> kick start the I2C transfer), 2) will be set to 1 in the ISR (to signal
> completion of the I2C transfer), and 3) will be checked in this function
> here. I thought that means I should declare it volatile, because it can
> be modified in both the process context and interrupt context (and I use
> atomic because I remember Linux checkpatch warns against using volatile)?

You don't need volatile or atomic_t for that.

Rather than switching to atomic_t when seeing the checkpatch warning,
you'd do better to read Documentation/volatile-considered-harmful.txt
to understand why checkpatch issues the warning, and realise that you
don't need it for the above.

Note that in the above code, the compiler can't make an assumption
about iproc_i2c->transfer_is_successful because it can't tell whether
a called function (eg, wait_for_completion_timeout()) could modify it.

Another possible issue with the above code are these lines:

	/* disable all interrupts */
	writel(0, iproc_i2c->base + IE_OFFSET);

It would be nice to think that would hit the hardware immediately, but
that's making assumptions about hardware which are not necessary true.
Your interrupt handler could even be running on another CPU after you've
asked for that register to be written.

Depending on what you're trying to achieve here, you may need:

	/* disable all interrupts */
	writel(0, iproc_i2c->base + IE_OFFSET);
	/* read it back to ensure the write has hit */
	readl(iproc_i2c->base + IE_OFFSET);

	/* make sure the interrupt handler isn't running */
	synchronize_irq(...->irq);

if what you're trying to do is to ensure that the interrupt handler has
finished running.

-- 
FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up
according to speedtest.net.

Re: [PATCH v6 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Russell King - ARM Linux]

To see why atomic_t is pure obfuscation:

typedef struct {
        int counter;
} atomic_t;

So, counter is a plain int.

On Mon, Jan 19, 2015 at 11:23:47AM -0800, Ray Jui wrote:
> +static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
> +{
> +	struct bcm_iproc_i2c_dev *iproc_i2c = data;
> +	u32 status = readl(iproc_i2c->base + IS_OFFSET);
> +
> +	status &= ISR_MASK;
> +
> +	if (!status)
> +		return IRQ_NONE;
> +
> +	writel(status, iproc_i2c->base + IS_OFFSET);
> +	atomic_set(&iproc_i2c->xfer_is_done, 1);

#define atomic_set(v,i) (((v)->counter) = (i))

So, this is the same as doing:

	iproc_i2c->xfer_is_done.counter = 1;

which is merely setting the 'int' to 1.

> +	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
> +
> +	/* disable all interrupts */
> +	writel(0, iproc_i2c->base + IE_OFFSET);
> +
> +	if (!time_left && !atomic_read(&iproc_i2c->xfer_is_done)) {

#define atomic_read(v)  ACCESS_ONCE((v)->counter)

This is practically the same as:

	if (!time_left && !iproc_i2c->xfer_is_done.counter) {

except that this access will be guaranteed to happen just once at this
location (see ACCESS_ONCE() in include/linux/compiler.h).

However, complete()..wait_for_completion() ensures that there are
barriers in the way: complete takes a spinlock on the waiter, so the
write to iproc_i2c->xfer_is_done.counter will be visible by the time
wait_for_completion() returns, and wait_for_completion() also does.
The same spinlock is also manipulated by wait_for_completion(), which
means there's barriers there as well, so it can't cache the value of
"counter" across that call.

So, the "volatile" access guaranteed by ACCESS_ONCE() isn't even
needed here.

(It would be needed if you were spinning in a loop, calling no other
functions - but then you're supposed to use cpu_relax() in that
circumstance, which has a compiler barrier in it, which ensures that
it will re-read such a variable each time.)

-- 
FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up
according to speedtest.net.

Re: [PATCH v6 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Russell King - ARM Linux]

To see why atomic_t is pure obfuscation:

typedef struct {
        int counter;
} atomic_t;

So, counter is a plain int.

On Mon, Jan 19, 2015 at 11:23:47AM -0800, Ray Jui wrote:
> +static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
> +{
> +	struct bcm_iproc_i2c_dev *iproc_i2c = data;
> +	u32 status = readl(iproc_i2c->base + IS_OFFSET);
> +
> +	status &= ISR_MASK;
> +
> +	if (!status)
> +		return IRQ_NONE;
> +
> +	writel(status, iproc_i2c->base + IS_OFFSET);
> +	atomic_set(&iproc_i2c->xfer_is_done, 1);

#define atomic_set(v,i) (((v)->counter) = (i))

So, this is the same as doing:

	iproc_i2c->xfer_is_done.counter = 1;

which is merely setting the 'int' to 1.

> +	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
> +
> +	/* disable all interrupts */
> +	writel(0, iproc_i2c->base + IE_OFFSET);
> +
> +	if (!time_left && !atomic_read(&iproc_i2c->xfer_is_done)) {

#define atomic_read(v)  ACCESS_ONCE((v)->counter)

This is practically the same as:

	if (!time_left && !iproc_i2c->xfer_is_done.counter) {

except that this access will be guaranteed to happen just once at this
location (see ACCESS_ONCE() in include/linux/compiler.h).

However, complete()..wait_for_completion() ensures that there are
barriers in the way: complete takes a spinlock on the waiter, so the
write to iproc_i2c->xfer_is_done.counter will be visible by the time
wait_for_completion() returns, and wait_for_completion() also does.
The same spinlock is also manipulated by wait_for_completion(), which
means there's barriers there as well, so it can't cache the value of
"counter" across that call.

So, the "volatile" access guaranteed by ACCESS_ONCE() isn't even
needed here.

(It would be needed if you were spinning in a loop, calling no other
functions - but then you're supposed to use cpu_relax() in that
circumstance, which has a compiler barrier in it, which ensures that
it will re-read such a variable each time.)

-- 
FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up
according to speedtest.net.
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[PATCH v6 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Russell King - ARM Linux]

To see why atomic_t is pure obfuscation:

typedef struct {
        int counter;
} atomic_t;

So, counter is a plain int.

On Mon, Jan 19, 2015 at 11:23:47AM -0800, Ray Jui wrote:
> +static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
> +{
> +	struct bcm_iproc_i2c_dev *iproc_i2c = data;
> +	u32 status = readl(iproc_i2c->base + IS_OFFSET);
> +
> +	status &= ISR_MASK;
> +
> +	if (!status)
> +		return IRQ_NONE;
> +
> +	writel(status, iproc_i2c->base + IS_OFFSET);
> +	atomic_set(&iproc_i2c->xfer_is_done, 1);

#define atomic_set(v,i) (((v)->counter) = (i))

So, this is the same as doing:

	iproc_i2c->xfer_is_done.counter = 1;

which is merely setting the 'int' to 1.

> +	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
> +
> +	/* disable all interrupts */
> +	writel(0, iproc_i2c->base + IE_OFFSET);
> +
> +	if (!time_left && !atomic_read(&iproc_i2c->xfer_is_done)) {

#define atomic_read(v)  ACCESS_ONCE((v)->counter)

This is practically the same as:

	if (!time_left && !iproc_i2c->xfer_is_done.counter) {

except that this access will be guaranteed to happen just once at this
location (see ACCESS_ONCE() in include/linux/compiler.h).

However, complete()..wait_for_completion() ensures that there are
barriers in the way: complete takes a spinlock on the waiter, so the
write to iproc_i2c->xfer_is_done.counter will be visible by the time
wait_for_completion() returns, and wait_for_completion() also does.
The same spinlock is also manipulated by wait_for_completion(), which
means there's barriers there as well, so it can't cache the value of
"counter" across that call.

So, the "volatile" access guaranteed by ACCESS_ONCE() isn't even
needed here.

(It would be needed if you were spinning in a loop, calling no other
functions - but then you're supposed to use cpu_relax() in that
circumstance, which has a compiler barrier in it, which ensures that
it will re-read such a variable each time.)

-- 
FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up
according to speedtest.net.

Re: [PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/19/2015 11:28 AM, Russell King - ARM Linux wrote:
> On Sat, Jan 17, 2015 at 04:30:33PM -0800, Ray Jui wrote:
>>
>>
>> On 1/17/2015 2:40 PM, Russell King - ARM Linux wrote:
>>> On Sat, Jan 17, 2015 at 01:26:41PM -0800, Ray Jui wrote:
>>>> 	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
>>>>
>>>> 	/* disable all interrupts */
>>>> 	writel(0, iproc_i2c->base + IE_OFFSET);
>>>>
>>>> 	if (!time_left && !atomic_read(&iproc_i2c->transfer_is_successful)) {
>>>
>>> Why are you using atomic_read() here?
>>>
>> transfer_is_successful 1) will be reset to 0 in this function (before
>> kick start the I2C transfer), 2) will be set to 1 in the ISR (to signal
>> completion of the I2C transfer), and 3) will be checked in this function
>> here. I thought that means I should declare it volatile, because it can
>> be modified in both the process context and interrupt context (and I use
>> atomic because I remember Linux checkpatch warns against using volatile)?
> 
> You don't need volatile or atomic_t for that.
> 
> Rather than switching to atomic_t when seeing the checkpatch warning,
> you'd do better to read Documentation/volatile-considered-harmful.txt
> to understand why checkpatch issues the warning, and realise that you
> don't need it for the above.
> 
> Note that in the above code, the compiler can't make an assumption
> about iproc_i2c->transfer_is_successful because it can't tell whether
> a called function (eg, wait_for_completion_timeout()) could modify it.
> 
Got it. Thanks.

> Another possible issue with the above code are these lines:
> 
> 	/* disable all interrupts */
> 	writel(0, iproc_i2c->base + IE_OFFSET);
> 
> It would be nice to think that would hit the hardware immediately, but
> that's making assumptions about hardware which are not necessary true.
> Your interrupt handler could even be running on another CPU after you've
> asked for that register to be written.
> 
> Depending on what you're trying to achieve here, you may need:
> 
> 	/* disable all interrupts */
> 	writel(0, iproc_i2c->base + IE_OFFSET);
> 	/* read it back to ensure the write has hit */
> 	readl(iproc_i2c->base + IE_OFFSET);
> 
> 	/* make sure the interrupt handler isn't running */
> 	synchronize_irq(...->irq);
> 
> if what you're trying to do is to ensure that the interrupt handler has
> finished running.
> 
This will be the most robust way of handling this. Given that we've
added an additional flag to check to make sure there's no interrupt
missed after wait_for_completion_timeout times out, it makes sense to
ensure that by the time when we check the flag there's no pending irq.
I'll add this to the driver and make 'xfer_is_done' an 'int' instead of
'atomic_t'. I will also add the call to readl to flush the write in the
remove function after interrupts are disabled.

Re: [PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/19/2015 11:28 AM, Russell King - ARM Linux wrote:
> On Sat, Jan 17, 2015 at 04:30:33PM -0800, Ray Jui wrote:
>>
>>
>> On 1/17/2015 2:40 PM, Russell King - ARM Linux wrote:
>>> On Sat, Jan 17, 2015 at 01:26:41PM -0800, Ray Jui wrote:
>>>> 	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
>>>>
>>>> 	/* disable all interrupts */
>>>> 	writel(0, iproc_i2c->base + IE_OFFSET);
>>>>
>>>> 	if (!time_left && !atomic_read(&iproc_i2c->transfer_is_successful)) {
>>>
>>> Why are you using atomic_read() here?
>>>
>> transfer_is_successful 1) will be reset to 0 in this function (before
>> kick start the I2C transfer), 2) will be set to 1 in the ISR (to signal
>> completion of the I2C transfer), and 3) will be checked in this function
>> here. I thought that means I should declare it volatile, because it can
>> be modified in both the process context and interrupt context (and I use
>> atomic because I remember Linux checkpatch warns against using volatile)?
> 
> You don't need volatile or atomic_t for that.
> 
> Rather than switching to atomic_t when seeing the checkpatch warning,
> you'd do better to read Documentation/volatile-considered-harmful.txt
> to understand why checkpatch issues the warning, and realise that you
> don't need it for the above.
> 
> Note that in the above code, the compiler can't make an assumption
> about iproc_i2c->transfer_is_successful because it can't tell whether
> a called function (eg, wait_for_completion_timeout()) could modify it.
> 
Got it. Thanks.

> Another possible issue with the above code are these lines:
> 
> 	/* disable all interrupts */
> 	writel(0, iproc_i2c->base + IE_OFFSET);
> 
> It would be nice to think that would hit the hardware immediately, but
> that's making assumptions about hardware which are not necessary true.
> Your interrupt handler could even be running on another CPU after you've
> asked for that register to be written.
> 
> Depending on what you're trying to achieve here, you may need:
> 
> 	/* disable all interrupts */
> 	writel(0, iproc_i2c->base + IE_OFFSET);
> 	/* read it back to ensure the write has hit */
> 	readl(iproc_i2c->base + IE_OFFSET);
> 
> 	/* make sure the interrupt handler isn't running */
> 	synchronize_irq(...->irq);
> 
> if what you're trying to do is to ensure that the interrupt handler has
> finished running.
> 
This will be the most robust way of handling this. Given that we've
added an additional flag to check to make sure there's no interrupt
missed after wait_for_completion_timeout times out, it makes sense to
ensure that by the time when we check the flag there's no pending irq.
I'll add this to the driver and make 'xfer_is_done' an 'int' instead of
'atomic_t'. I will also add the call to readl to flush the write in the
remove function after interrupts are disabled.

[PATCH v4 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/19/2015 11:28 AM, Russell King - ARM Linux wrote:
> On Sat, Jan 17, 2015 at 04:30:33PM -0800, Ray Jui wrote:
>>
>>
>> On 1/17/2015 2:40 PM, Russell King - ARM Linux wrote:
>>> On Sat, Jan 17, 2015 at 01:26:41PM -0800, Ray Jui wrote:
>>>> 	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
>>>>
>>>> 	/* disable all interrupts */
>>>> 	writel(0, iproc_i2c->base + IE_OFFSET);
>>>>
>>>> 	if (!time_left && !atomic_read(&iproc_i2c->transfer_is_successful)) {
>>>
>>> Why are you using atomic_read() here?
>>>
>> transfer_is_successful 1) will be reset to 0 in this function (before
>> kick start the I2C transfer), 2) will be set to 1 in the ISR (to signal
>> completion of the I2C transfer), and 3) will be checked in this function
>> here. I thought that means I should declare it volatile, because it can
>> be modified in both the process context and interrupt context (and I use
>> atomic because I remember Linux checkpatch warns against using volatile)?
> 
> You don't need volatile or atomic_t for that.
> 
> Rather than switching to atomic_t when seeing the checkpatch warning,
> you'd do better to read Documentation/volatile-considered-harmful.txt
> to understand why checkpatch issues the warning, and realise that you
> don't need it for the above.
> 
> Note that in the above code, the compiler can't make an assumption
> about iproc_i2c->transfer_is_successful because it can't tell whether
> a called function (eg, wait_for_completion_timeout()) could modify it.
> 
Got it. Thanks.

> Another possible issue with the above code are these lines:
> 
> 	/* disable all interrupts */
> 	writel(0, iproc_i2c->base + IE_OFFSET);
> 
> It would be nice to think that would hit the hardware immediately, but
> that's making assumptions about hardware which are not necessary true.
> Your interrupt handler could even be running on another CPU after you've
> asked for that register to be written.
> 
> Depending on what you're trying to achieve here, you may need:
> 
> 	/* disable all interrupts */
> 	writel(0, iproc_i2c->base + IE_OFFSET);
> 	/* read it back to ensure the write has hit */
> 	readl(iproc_i2c->base + IE_OFFSET);
> 
> 	/* make sure the interrupt handler isn't running */
> 	synchronize_irq(...->irq);
> 
> if what you're trying to do is to ensure that the interrupt handler has
> finished running.
> 
This will be the most robust way of handling this. Given that we've
added an additional flag to check to make sure there's no interrupt
missed after wait_for_completion_timeout times out, it makes sense to
ensure that by the time when we check the flag there's no pending irq.
I'll add this to the driver and make 'xfer_is_done' an 'int' instead of
'atomic_t'. I will also add the call to readl to flush the write in the
remove function after interrupts are disabled.

Re: [PATCH v6 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/19/2015 11:44 AM, Russell King - ARM Linux wrote:
> To see why atomic_t is pure obfuscation:
> 
> typedef struct {
>         int counter;
> } atomic_t;
> 
> So, counter is a plain int.
> 
> On Mon, Jan 19, 2015 at 11:23:47AM -0800, Ray Jui wrote:
>> +static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
>> +{
>> +	struct bcm_iproc_i2c_dev *iproc_i2c = data;
>> +	u32 status = readl(iproc_i2c->base + IS_OFFSET);
>> +
>> +	status &= ISR_MASK;
>> +
>> +	if (!status)
>> +		return IRQ_NONE;
>> +
>> +	writel(status, iproc_i2c->base + IS_OFFSET);
>> +	atomic_set(&iproc_i2c->xfer_is_done, 1);
> 
> #define atomic_set(v,i) (((v)->counter) = (i))
> 
> So, this is the same as doing:
> 
> 	iproc_i2c->xfer_is_done.counter = 1;
> 
> which is merely setting the 'int' to 1.
> 
>> +	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
>> +
>> +	/* disable all interrupts */
>> +	writel(0, iproc_i2c->base + IE_OFFSET);
>> +
>> +	if (!time_left && !atomic_read(&iproc_i2c->xfer_is_done)) {
> 
> #define atomic_read(v)  ACCESS_ONCE((v)->counter)
> 
> This is practically the same as:
> 
> 	if (!time_left && !iproc_i2c->xfer_is_done.counter) {
> 
> except that this access will be guaranteed to happen just once at this
> location (see ACCESS_ONCE() in include/linux/compiler.h).
> 
> However, complete()..wait_for_completion() ensures that there are
> barriers in the way: complete takes a spinlock on the waiter, so the
> write to iproc_i2c->xfer_is_done.counter will be visible by the time
> wait_for_completion() returns, and wait_for_completion() also does.
> The same spinlock is also manipulated by wait_for_completion(), which
> means there's barriers there as well, so it can't cache the value of
> "counter" across that call.
> 
> So, the "volatile" access guaranteed by ACCESS_ONCE() isn't even
> needed here.
> 
> (It would be needed if you were spinning in a loop, calling no other
> functions - but then you're supposed to use cpu_relax() in that
> circumstance, which has a compiler barrier in it, which ensures that
> it will re-read such a variable each time.)
> 
I really learned a good lesson here. Thanks for the thorough explanation!

Re: [PATCH v6 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/19/2015 11:44 AM, Russell King - ARM Linux wrote:
> To see why atomic_t is pure obfuscation:
> 
> typedef struct {
>         int counter;
> } atomic_t;
> 
> So, counter is a plain int.
> 
> On Mon, Jan 19, 2015 at 11:23:47AM -0800, Ray Jui wrote:
>> +static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
>> +{
>> +	struct bcm_iproc_i2c_dev *iproc_i2c = data;
>> +	u32 status = readl(iproc_i2c->base + IS_OFFSET);
>> +
>> +	status &= ISR_MASK;
>> +
>> +	if (!status)
>> +		return IRQ_NONE;
>> +
>> +	writel(status, iproc_i2c->base + IS_OFFSET);
>> +	atomic_set(&iproc_i2c->xfer_is_done, 1);
> 
> #define atomic_set(v,i) (((v)->counter) = (i))
> 
> So, this is the same as doing:
> 
> 	iproc_i2c->xfer_is_done.counter = 1;
> 
> which is merely setting the 'int' to 1.
> 
>> +	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
>> +
>> +	/* disable all interrupts */
>> +	writel(0, iproc_i2c->base + IE_OFFSET);
>> +
>> +	if (!time_left && !atomic_read(&iproc_i2c->xfer_is_done)) {
> 
> #define atomic_read(v)  ACCESS_ONCE((v)->counter)
> 
> This is practically the same as:
> 
> 	if (!time_left && !iproc_i2c->xfer_is_done.counter) {
> 
> except that this access will be guaranteed to happen just once at this
> location (see ACCESS_ONCE() in include/linux/compiler.h).
> 
> However, complete()..wait_for_completion() ensures that there are
> barriers in the way: complete takes a spinlock on the waiter, so the
> write to iproc_i2c->xfer_is_done.counter will be visible by the time
> wait_for_completion() returns, and wait_for_completion() also does.
> The same spinlock is also manipulated by wait_for_completion(), which
> means there's barriers there as well, so it can't cache the value of
> "counter" across that call.
> 
> So, the "volatile" access guaranteed by ACCESS_ONCE() isn't even
> needed here.
> 
> (It would be needed if you were spinning in a loop, calling no other
> functions - but then you're supposed to use cpu_relax() in that
> circumstance, which has a compiler barrier in it, which ensures that
> it will re-read such a variable each time.)
> 
I really learned a good lesson here. Thanks for the thorough explanation!
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[PATCH v6 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 1/19/2015 11:44 AM, Russell King - ARM Linux wrote:
> To see why atomic_t is pure obfuscation:
> 
> typedef struct {
>         int counter;
> } atomic_t;
> 
> So, counter is a plain int.
> 
> On Mon, Jan 19, 2015 at 11:23:47AM -0800, Ray Jui wrote:
>> +static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
>> +{
>> +	struct bcm_iproc_i2c_dev *iproc_i2c = data;
>> +	u32 status = readl(iproc_i2c->base + IS_OFFSET);
>> +
>> +	status &= ISR_MASK;
>> +
>> +	if (!status)
>> +		return IRQ_NONE;
>> +
>> +	writel(status, iproc_i2c->base + IS_OFFSET);
>> +	atomic_set(&iproc_i2c->xfer_is_done, 1);
> 
> #define atomic_set(v,i) (((v)->counter) = (i))
> 
> So, this is the same as doing:
> 
> 	iproc_i2c->xfer_is_done.counter = 1;
> 
> which is merely setting the 'int' to 1.
> 
>> +	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
>> +
>> +	/* disable all interrupts */
>> +	writel(0, iproc_i2c->base + IE_OFFSET);
>> +
>> +	if (!time_left && !atomic_read(&iproc_i2c->xfer_is_done)) {
> 
> #define atomic_read(v)  ACCESS_ONCE((v)->counter)
> 
> This is practically the same as:
> 
> 	if (!time_left && !iproc_i2c->xfer_is_done.counter) {
> 
> except that this access will be guaranteed to happen just once at this
> location (see ACCESS_ONCE() in include/linux/compiler.h).
> 
> However, complete()..wait_for_completion() ensures that there are
> barriers in the way: complete takes a spinlock on the waiter, so the
> write to iproc_i2c->xfer_is_done.counter will be visible by the time
> wait_for_completion() returns, and wait_for_completion() also does.
> The same spinlock is also manipulated by wait_for_completion(), which
> means there's barriers there as well, so it can't cache the value of
> "counter" across that call.
> 
> So, the "volatile" access guaranteed by ACCESS_ONCE() isn't even
> needed here.
> 
> (It would be needed if you were spinning in a loop, calling no other
> functions - but then you're supposed to use cpu_relax() in that
> circumstance, which has a compiler barrier in it, which ensures that
> it will re-read such a variable each time.)
> 
I really learned a good lesson here. Thanks for the thorough explanation!

[PATCH v7 0/3] Add I2C support to Broadcom iProc

[Ray Jui]

This patchset contains the initial I2C support for Broadcom iProc family of
SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has a
size of 64 bytes. The iProc I2C controller supports two bus speeds including
standard mode (100 kHz) and fast mode (400 kHz)

Changes from v6:
 - Get rid of unnecessary atomic variable usage in the driver
 - Improve the "waiting for transaction to complete" logic further by making
   sure there's no pending/ongoing interrupt by the time when flag
   'xfer_is_done' is checked
 - After disabling interrupt with 'writel', add 'readl' to the same register
   to flush the bus to ensure the write has gone through

Changes from v5:
 - Improve the "waiting for transaction to be complete" logic to take care of
   the corner case when an interrupt fires after wait_for_completion_timeout
   times out
 - Improve the logic to disable I2C interrupt in the remove function. Make it
   more generic so it works for both dedicated and shared interrupt

Changes from v4:
 - Remove redundant header file includes
 - Change the logic that waits for the host controller to be idle to
   simply return -EBUSY
 - Use proper print level and error codes in the driver
 - Allow zero length message in the driver to support I2C_SMBUS_QUICK
 - Change back to use devm_request_irq. Disable interrupt in the remove
   function so there's no outstanding I2C interrupt when the driver is
   being removed from the framework
 - Other minor miscellaneous improvements and fixes

Changes from v3:
 - Add config dependency to COMPILE_TEST to allow the driver to be build tested
   by other platforms
 - Improve CPU utilization efficiency in the loop of waiting for bus to idle
 - Add more comment in the driver to clarify the way how the "start busy"
   interrupt is triggered from the I2C controller
 - Fix inconsistent coding style and format
 - Improve the bus speed validation logic in the driver
 - Add code to free the interrupt line in driver's remove function. Also
   change to use non-devm API to request the interrupt line
 - Other miscellaneous improvements and fixes

Changes from v2:
 - Have the I2C driver default to y so it does not need to be selected from
   ARCH_BCM_IPROC. This also helps to get rid of one patch. The driver still
   depends on ARCH_BCM_IPROC
 - Get rid of redundant check on resource returned by platform_get_resource

Changes from v1:
 - Fix function argument parenthesis
 - Get rid of redundant driver owner field

Ray Jui (3):
  i2c: iProc: define Broadcom iProc I2C binding
  i2c: iproc: Add Broadcom iProc I2C Driver
  ARM: dts: add I2C device nodes for Broadcom Cygnus

 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   20 +
 drivers/i2c/busses/Kconfig                         |   10 +
 drivers/i2c/busses/Makefile                        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c                 |  505 ++++++++++++++++++++
 5 files changed, 573 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

-- 
1.7.9.5

[PATCH v7 0/3] Add I2C support to Broadcom iProc

[Ray Jui]

This patchset contains the initial I2C support for Broadcom iProc family of
SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has a
size of 64 bytes. The iProc I2C controller supports two bus speeds including
standard mode (100 kHz) and fast mode (400 kHz)

Changes from v6:
 - Get rid of unnecessary atomic variable usage in the driver
 - Improve the "waiting for transaction to complete" logic further by making
   sure there's no pending/ongoing interrupt by the time when flag
   'xfer_is_done' is checked
 - After disabling interrupt with 'writel', add 'readl' to the same register
   to flush the bus to ensure the write has gone through

Changes from v5:
 - Improve the "waiting for transaction to be complete" logic to take care of
   the corner case when an interrupt fires after wait_for_completion_timeout
   times out
 - Improve the logic to disable I2C interrupt in the remove function. Make it
   more generic so it works for both dedicated and shared interrupt

Changes from v4:
 - Remove redundant header file includes
 - Change the logic that waits for the host controller to be idle to
   simply return -EBUSY
 - Use proper print level and error codes in the driver
 - Allow zero length message in the driver to support I2C_SMBUS_QUICK
 - Change back to use devm_request_irq. Disable interrupt in the remove
   function so there's no outstanding I2C interrupt when the driver is
   being removed from the framework
 - Other minor miscellaneous improvements and fixes

Changes from v3:
 - Add config dependency to COMPILE_TEST to allow the driver to be build tested
   by other platforms
 - Improve CPU utilization efficiency in the loop of waiting for bus to idle
 - Add more comment in the driver to clarify the way how the "start busy"
   interrupt is triggered from the I2C controller
 - Fix inconsistent coding style and format
 - Improve the bus speed validation logic in the driver
 - Add code to free the interrupt line in driver's remove function. Also
   change to use non-devm API to request the interrupt line
 - Other miscellaneous improvements and fixes

Changes from v2:
 - Have the I2C driver default to y so it does not need to be selected from
   ARCH_BCM_IPROC. This also helps to get rid of one patch. The driver still
   depends on ARCH_BCM_IPROC
 - Get rid of redundant check on resource returned by platform_get_resource

Changes from v1:
 - Fix function argument parenthesis
 - Get rid of redundant driver owner field

Ray Jui (3):
  i2c: iProc: define Broadcom iProc I2C binding
  i2c: iproc: Add Broadcom iProc I2C Driver
  ARM: dts: add I2C device nodes for Broadcom Cygnus

 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   20 +
 drivers/i2c/busses/Kconfig                         |   10 +
 drivers/i2c/busses/Makefile                        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c                 |  505 ++++++++++++++++++++
 5 files changed, 573 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

-- 
1.7.9.5

[PATCH v7 0/3] Add I2C support to Broadcom iProc

[Ray Jui]

This patchset contains the initial I2C support for Broadcom iProc family of
SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has a
size of 64 bytes. The iProc I2C controller supports two bus speeds including
standard mode (100 kHz) and fast mode (400 kHz)

Changes from v6:
 - Get rid of unnecessary atomic variable usage in the driver
 - Improve the "waiting for transaction to complete" logic further by making
   sure there's no pending/ongoing interrupt by the time when flag
   'xfer_is_done' is checked
 - After disabling interrupt with 'writel', add 'readl' to the same register
   to flush the bus to ensure the write has gone through

Changes from v5:
 - Improve the "waiting for transaction to be complete" logic to take care of
   the corner case when an interrupt fires after wait_for_completion_timeout
   times out
 - Improve the logic to disable I2C interrupt in the remove function. Make it
   more generic so it works for both dedicated and shared interrupt

Changes from v4:
 - Remove redundant header file includes
 - Change the logic that waits for the host controller to be idle to
   simply return -EBUSY
 - Use proper print level and error codes in the driver
 - Allow zero length message in the driver to support I2C_SMBUS_QUICK
 - Change back to use devm_request_irq. Disable interrupt in the remove
   function so there's no outstanding I2C interrupt when the driver is
   being removed from the framework
 - Other minor miscellaneous improvements and fixes

Changes from v3:
 - Add config dependency to COMPILE_TEST to allow the driver to be build tested
   by other platforms
 - Improve CPU utilization efficiency in the loop of waiting for bus to idle
 - Add more comment in the driver to clarify the way how the "start busy"
   interrupt is triggered from the I2C controller
 - Fix inconsistent coding style and format
 - Improve the bus speed validation logic in the driver
 - Add code to free the interrupt line in driver's remove function. Also
   change to use non-devm API to request the interrupt line
 - Other miscellaneous improvements and fixes

Changes from v2:
 - Have the I2C driver default to y so it does not need to be selected from
   ARCH_BCM_IPROC. This also helps to get rid of one patch. The driver still
   depends on ARCH_BCM_IPROC
 - Get rid of redundant check on resource returned by platform_get_resource

Changes from v1:
 - Fix function argument parenthesis
 - Get rid of redundant driver owner field

Ray Jui (3):
  i2c: iProc: define Broadcom iProc I2C binding
  i2c: iproc: Add Broadcom iProc I2C Driver
  ARM: dts: add I2C device nodes for Broadcom Cygnus

 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   20 +
 drivers/i2c/busses/Kconfig                         |   10 +
 drivers/i2c/busses/Makefile                        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c                 |  505 ++++++++++++++++++++
 5 files changed, 573 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

-- 
1.7.9.5

[PATCH v7 1/3] i2c: iProc: define Broadcom iProc I2C binding

[Ray Jui]

Document the I2C device tree binding for Broadcom iProc family of
SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt

diff --git a/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
new file mode 100644
index 0000000..81f982c
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
@@ -0,0 +1,37 @@
+Broadcom iProc I2C controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,iproc-i2c"
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+    I2C controller registers
+
+- interrupts:
+    Should contain the I2C interrupt
+
+- clock-frequency:
+    This is the I2C bus clock. Need to be either 100000 or 400000
+
+- #address-cells:
+    Always 1 (for I2C addresses)
+
+- #size-cells:
+    Always 0
+
+Example:
+	i2c0: i2c@18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+
+		codec: wm8750@1a {
+			compatible = "wlf,wm8750";
+			reg = <0x1a>;
+		};
+	};
-- 
1.7.9.5

[PATCH v7 1/3] i2c: iProc: define Broadcom iProc I2C binding

[Ray Jui]

Document the I2C device tree binding for Broadcom iProc family of
SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt

diff --git a/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
new file mode 100644
index 0000000..81f982c
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
@@ -0,0 +1,37 @@
+Broadcom iProc I2C controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,iproc-i2c"
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+    I2C controller registers
+
+- interrupts:
+    Should contain the I2C interrupt
+
+- clock-frequency:
+    This is the I2C bus clock. Need to be either 100000 or 400000
+
+- #address-cells:
+    Always 1 (for I2C addresses)
+
+- #size-cells:
+    Always 0
+
+Example:
+	i2c0: i2c@18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+
+		codec: wm8750@1a {
+			compatible = "wlf,wm8750";
+			reg = <0x1a>;
+		};
+	};
-- 
1.7.9.5

[PATCH v7 1/3] i2c: iProc: define Broadcom iProc I2C binding

[Ray Jui]

Document the I2C device tree binding for Broadcom iProc family of
SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt

diff --git a/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
new file mode 100644
index 0000000..81f982c
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
@@ -0,0 +1,37 @@
+Broadcom iProc I2C controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,iproc-i2c"
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+    I2C controller registers
+
+- interrupts:
+    Should contain the I2C interrupt
+
+- clock-frequency:
+    This is the I2C bus clock. Need to be either 100000 or 400000
+
+- #address-cells:
+    Always 1 (for I2C addresses)
+
+- #size-cells:
+    Always 0
+
+Example:
+	i2c0: i2c at 18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+
+		codec: wm8750 at 1a {
+			compatible = "wlf,wm8750";
+			reg = <0x1a>;
+		};
+	};
-- 
1.7.9.5

[PATCH v7 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

Add initial support to the Broadcom iProc I2C controller found in the
iProc family of SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has
a size of 64 bytes. The iProc I2C controller supports two bus speeds
including standard mode (100kHz) and fast mode (400kHz)

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/i2c/busses/Kconfig         |   10 +
 drivers/i2c/busses/Makefile        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c |  505 ++++++++++++++++++++++++++++++++++++
 3 files changed, 516 insertions(+)
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 31e8308..af76d23 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -372,6 +372,16 @@ config I2C_BCM2835
 	  This support is also available as a module.  If so, the module
 	  will be called i2c-bcm2835.
 
+config I2C_BCM_IPROC
+	tristate "Broadcom iProc I2C controller"
+	depends on ARCH_BCM_IPROC || COMPILE_TEST
+	default ARCH_BCM_IPROC
+	help
+	  If you say yes to this option, support will be included for the
+	  Broadcom iProc I2C controller.
+
+	  If you don't know what to do here, say N.
+
 config I2C_BCM_KONA
 	tristate "BCM Kona I2C adapter"
 	depends on ARCH_BCM_MOBILE
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 56388f6..d93b509 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
 obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
 obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
 obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
+obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
 obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
 obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
 obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
new file mode 100644
index 0000000..64c622f
--- /dev/null
+++ b/drivers/i2c/busses/i2c-bcm-iproc.c
@@ -0,0 +1,505 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+
+#define CFG_OFFSET                   0x00
+#define CFG_RESET_SHIFT              31
+#define CFG_EN_SHIFT                 30
+#define CFG_M_RETRY_CNT_SHIFT        16
+#define CFG_M_RETRY_CNT_MASK         0x0f
+
+#define TIM_CFG_OFFSET               0x04
+#define TIM_CFG_MODE_400_SHIFT       31
+
+#define M_FIFO_CTRL_OFFSET           0x0c
+#define M_FIFO_RX_FLUSH_SHIFT        31
+#define M_FIFO_TX_FLUSH_SHIFT        30
+#define M_FIFO_RX_CNT_SHIFT          16
+#define M_FIFO_RX_CNT_MASK           0x7f
+#define M_FIFO_RX_THLD_SHIFT         8
+#define M_FIFO_RX_THLD_MASK          0x3f
+
+#define M_CMD_OFFSET                 0x30
+#define M_CMD_START_BUSY_SHIFT       31
+#define M_CMD_STATUS_SHIFT           25
+#define M_CMD_STATUS_MASK            0x07
+#define M_CMD_STATUS_SUCCESS         0x0
+#define M_CMD_STATUS_LOST_ARB        0x1
+#define M_CMD_STATUS_NACK_ADDR       0x2
+#define M_CMD_STATUS_NACK_DATA       0x3
+#define M_CMD_STATUS_TIMEOUT         0x4
+#define M_CMD_PROTOCOL_SHIFT         9
+#define M_CMD_PROTOCOL_MASK          0xf
+#define M_CMD_PROTOCOL_BLK_WR        0x7
+#define M_CMD_PROTOCOL_BLK_RD        0x8
+#define M_CMD_PEC_SHIFT              8
+#define M_CMD_RD_CNT_SHIFT           0
+#define M_CMD_RD_CNT_MASK            0xff
+
+#define IE_OFFSET                    0x38
+#define IE_M_RX_FIFO_FULL_SHIFT      31
+#define IE_M_RX_THLD_SHIFT           30
+#define IE_M_START_BUSY_SHIFT        28
+
+#define IS_OFFSET                    0x3c
+#define IS_M_RX_FIFO_FULL_SHIFT      31
+#define IS_M_RX_THLD_SHIFT           30
+#define IS_M_START_BUSY_SHIFT        28
+
+#define M_TX_OFFSET                  0x40
+#define M_TX_WR_STATUS_SHIFT         31
+#define M_TX_DATA_SHIFT              0
+#define M_TX_DATA_MASK               0xff
+
+#define M_RX_OFFSET                  0x44
+#define M_RX_STATUS_SHIFT            30
+#define M_RX_STATUS_MASK             0x03
+#define M_RX_PEC_ERR_SHIFT           29
+#define M_RX_DATA_SHIFT              0
+#define M_RX_DATA_MASK               0xff
+
+#define I2C_TIMEOUT_MESC             100
+#define M_TX_RX_FIFO_SIZE            64
+
+enum bus_speed_index {
+	I2C_SPD_100K = 0,
+	I2C_SPD_400K,
+};
+
+struct bcm_iproc_i2c_dev {
+	struct device *device;
+	int irq;
+
+	void __iomem *base;
+
+	struct i2c_adapter adapter;
+
+	struct completion done;
+	int xfer_is_done;
+};
+
+/*
+ * Can be expanded in the future if more interrupt status bits are utilized
+ */
+#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
+
+static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = data;
+	u32 status = readl(iproc_i2c->base + IS_OFFSET);
+
+	status &= ISR_MASK;
+
+	if (!status)
+		return IRQ_NONE;
+
+	writel(status, iproc_i2c->base + IS_OFFSET);
+	iproc_i2c->xfer_is_done = 1;
+	complete_all(&iproc_i2c->done);
+
+	return IRQ_HANDLED;
+}
+
+static bool bcm_iproc_i2c_bus_busy(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	if (readl(iproc_i2c->base + M_CMD_OFFSET) &
+	    (1 << M_CMD_START_BUSY_SHIFT))
+		return true;
+	else
+		return false;
+}
+
+static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *iproc_i2c,
+				     struct i2c_msg *msg, u8 *addr)
+{
+
+	if (msg->flags & I2C_M_TEN) {
+		dev_err(iproc_i2c->device, "no support for 10-bit address\n");
+		return -EINVAL;
+	}
+
+	*addr = msg->addr << 1;
+
+	if (msg->flags & I2C_M_RD)
+		*addr |= 1;
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *iproc_i2c,
+				      struct i2c_msg *msg)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + M_CMD_OFFSET);
+	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
+
+	switch (val) {
+	case M_CMD_STATUS_SUCCESS:
+		return 0;
+
+	case M_CMD_STATUS_LOST_ARB:
+		dev_dbg(iproc_i2c->device, "lost bus arbitration\n");
+		return -EAGAIN;
+
+	case M_CMD_STATUS_NACK_ADDR:
+		dev_dbg(iproc_i2c->device, "NAK addr:0x%02x\n", msg->addr);
+		return -ENXIO;
+
+	case M_CMD_STATUS_NACK_DATA:
+		dev_dbg(iproc_i2c->device, "NAK data\n");
+		return -ENXIO;
+
+	case M_CMD_STATUS_TIMEOUT:
+		dev_dbg(iproc_i2c->device, "bus timeout\n");
+		return -ETIMEDOUT;
+
+	default:
+		dev_dbg(iproc_i2c->device, "unknown error code=%d\n", val);
+		return -EIO;
+	}
+}
+
+static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *iproc_i2c,
+					 struct i2c_msg *msg)
+{
+	int ret, i;
+	u8 addr;
+	u32 val;
+	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	if (msg->len > M_TX_RX_FIFO_SIZE - 1) {
+		dev_err(iproc_i2c->device,
+			"only support data length up to %u bytes\n",
+			M_TX_RX_FIFO_SIZE - 1);
+		return -EINVAL;
+	}
+
+	if (bcm_iproc_i2c_bus_busy(iproc_i2c)) {
+		dev_warn(iproc_i2c->device, "bus is busy\n");
+		return -EBUSY;
+	}
+
+	ret = bcm_iproc_i2c_format_addr(iproc_i2c, msg, &addr);
+	if (ret)
+		return ret;
+
+	/* load slave address into the TX FIFO */
+	writel(addr, iproc_i2c->base + M_TX_OFFSET);
+
+	/* for a write transaction, load data into the TX FIFO */
+	if (!(msg->flags & I2C_M_RD)) {
+		for (i = 0; i < msg->len; i++) {
+			val = msg->buf[i];
+
+			/* mark the last byte */
+			if (i == msg->len - 1)
+				val |= 1 << M_TX_WR_STATUS_SHIFT;
+
+			writel(val, iproc_i2c->base + M_TX_OFFSET);
+		}
+
+		if (msg->len == 0)
+			writel(1 << M_TX_WR_STATUS_SHIFT,
+			       iproc_i2c->base + M_TX_OFFSET);
+	}
+
+	/* mark as incomplete before starting the transaction */
+	reinit_completion(&iproc_i2c->done);
+	iproc_i2c->xfer_is_done = 0;
+
+	/*
+	 * Enable the "start busy" interrupt, which will be triggered after the
+	 * transaction is done, i.e., the internal start_busy bit, transitions
+	 * from 1 to 0.
+	 */
+	writel(1 << IE_M_START_BUSY_SHIFT, iproc_i2c->base + IE_OFFSET);
+
+	/*
+	 * Now we can activate the transfer. For a read operation, specify the
+	 * number of bytes to read
+	 */
+	val = 1 << M_CMD_START_BUSY_SHIFT;
+	if (msg->flags & I2C_M_RD) {
+		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
+		       (msg->len << M_CMD_RD_CNT_SHIFT);
+	} else {
+		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
+	}
+	writel(val, iproc_i2c->base + M_CMD_OFFSET);
+
+	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+	/* read it back to flush the write */
+	readl(iproc_i2c->base + IE_OFFSET);
+
+	/* make sure the interrupt handler isn't running */
+	synchronize_irq(iproc_i2c->irq);
+
+	if (!time_left && !iproc_i2c->xfer_is_done) {
+		dev_err(iproc_i2c->device, "transaction timed out\n");
+
+		/* flush FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return -ETIMEDOUT;
+	}
+
+	ret = bcm_iproc_i2c_check_status(iproc_i2c, msg);
+	if (ret) {
+		/* flush both TX/RX FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return ret;
+	}
+
+	/*
+	 * For a read operation, we now need to load the data from FIFO
+	 * into the memory buffer
+	 */
+	if (msg->flags & I2C_M_RD) {
+		for (i = 0; i < msg->len; i++) {
+			msg->buf[i] = (readl(iproc_i2c->base + M_RX_OFFSET) >>
+				      M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
+		}
+	}
+
+	dev_dbg(iproc_i2c->device, "xfer %c, addr=0x%02x, len=%d\n",
+		(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
+		msg->len);
+	dev_dbg(iproc_i2c->device, "**** data start ****\n");
+	for (i = 0; i < msg->len; i++)
+		dev_dbg(iproc_i2c->device, "0x%02x ",  msg->buf[i]);
+	dev_dbg(iproc_i2c->device, "**** data end ****\n");
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
+			      struct i2c_msg msgs[], int num)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = i2c_get_adapdata(adapter);
+	int ret, i;
+
+	/* go through all messages */
+	for (i = 0; i < num; i++) {
+		ret = bcm_iproc_i2c_xfer_single_msg(iproc_i2c, &msgs[i]);
+		if (ret) {
+			dev_err(iproc_i2c->device, "xfer failed\n");
+			return ret;
+		}
+	}
+
+	return num;
+}
+
+static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm bcm_iproc_algo = {
+	.master_xfer = bcm_iproc_i2c_xfer,
+	.functionality = bcm_iproc_i2c_functionality,
+};
+
+static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	unsigned int bus_speed, speed_bit;
+	u32 val;
+	int ret = of_property_read_u32(iproc_i2c->device->of_node,
+				       "clock-frequency", &bus_speed);
+	if (ret < 0) {
+		dev_info(iproc_i2c->device,
+			"unable to interpret clock-frequency DT property\n");
+		bus_speed = 100000;
+	}
+
+	if (bus_speed < 100000) {
+		dev_err(iproc_i2c->device, "%d Hz bus speed not supported\n",
+			bus_speed);
+		dev_err(iproc_i2c->device,
+			"valid speeds are 100khz and 400khz\n");
+		return -EINVAL;
+	} else if (bus_speed < 400000) {
+		speed_bit = 0;
+	} else {
+		/* bus_speed >= 400000 */
+		speed_bit = 1;
+	}
+
+	val = readl(iproc_i2c->base + TIM_CFG_OFFSET);
+	val &= ~(1 << TIM_CFG_MODE_400_SHIFT);
+	val |= speed_bit << TIM_CFG_MODE_400_SHIFT;
+	writel(val, iproc_i2c->base + TIM_CFG_OFFSET);
+
+	dev_info(iproc_i2c->device, "bus set to %u Hz\n", bus_speed);
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	/* put controller in reset */
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val |= 1 << CFG_RESET_SHIFT;
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* wait 100 usec per spec */
+	udelay(100);
+
+	/* bring controller out of reset */
+	val &= ~(1 << CFG_RESET_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
+	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
+	writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+
+	/* clear all pending interrupts */
+	writel(0xffffffff, iproc_i2c->base + IS_OFFSET);
+
+	return 0;
+}
+
+static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val |= 1 << CFG_EN_SHIFT;
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+}
+
+static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+}
+
+static int bcm_iproc_i2c_probe(struct platform_device *pdev)
+{
+	int irq, ret = 0;
+	struct bcm_iproc_i2c_dev *iproc_i2c;
+	struct i2c_adapter *adap;
+	struct resource *res;
+
+	iproc_i2c = devm_kzalloc(&pdev->dev, sizeof(*iproc_i2c),
+				 GFP_KERNEL);
+	if (!iproc_i2c)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, iproc_i2c);
+	iproc_i2c->device = &pdev->dev;
+	init_completion(&iproc_i2c->done);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	iproc_i2c->base = devm_ioremap_resource(iproc_i2c->device, res);
+	if (IS_ERR(iproc_i2c->base))
+		return PTR_ERR(iproc_i2c->base);
+
+	ret = bcm_iproc_i2c_init(iproc_i2c);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_cfg_speed(iproc_i2c);
+	if (ret)
+		return ret;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq <= 0) {
+		dev_err(iproc_i2c->device, "no irq resource\n");
+		return irq;
+	}
+	iproc_i2c->irq = irq;
+
+	ret = devm_request_irq(iproc_i2c->device, irq, bcm_iproc_i2c_isr, 0,
+			       pdev->name, iproc_i2c);
+	if (ret < 0) {
+		dev_err(iproc_i2c->device, "unable to request irq %i\n", irq);
+		return ret;
+	}
+
+	bcm_iproc_i2c_enable(iproc_i2c);
+
+	adap = &iproc_i2c->adapter;
+	i2c_set_adapdata(adap, iproc_i2c);
+	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
+	adap->algo = &bcm_iproc_algo;
+	adap->dev.parent = &pdev->dev;
+	adap->dev.of_node = pdev->dev.of_node;
+
+	ret = i2c_add_adapter(adap);
+	if (ret) {
+		dev_err(iproc_i2c->device, "failed to add adapter\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_remove(struct platform_device *pdev)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
+
+	/* make sure there's no pending interrupt when we remove the adapter */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+	readl(iproc_i2c->base + IE_OFFSET);
+	synchronize_irq(iproc_i2c->irq);
+
+	i2c_del_adapter(&iproc_i2c->adapter);
+	bcm_iproc_i2c_disable(iproc_i2c);
+
+	return 0;
+}
+
+static const struct of_device_id bcm_iproc_i2c_of_match[] = {
+	{ .compatible = "brcm,iproc-i2c" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
+
+static struct platform_driver bcm_iproc_i2c_driver = {
+	.driver = {
+		.name = "bcm-iproc-i2c",
+		.of_match_table = bcm_iproc_i2c_of_match,
+	},
+	.probe = bcm_iproc_i2c_probe,
+	.remove = bcm_iproc_i2c_remove,
+};
+module_platform_driver(bcm_iproc_i2c_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v7 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

Add initial support to the Broadcom iProc I2C controller found in the
iProc family of SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has
a size of 64 bytes. The iProc I2C controller supports two bus speeds
including standard mode (100kHz) and fast mode (400kHz)

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/i2c/busses/Kconfig         |   10 +
 drivers/i2c/busses/Makefile        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c |  505 ++++++++++++++++++++++++++++++++++++
 3 files changed, 516 insertions(+)
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 31e8308..af76d23 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -372,6 +372,16 @@ config I2C_BCM2835
 	  This support is also available as a module.  If so, the module
 	  will be called i2c-bcm2835.
 
+config I2C_BCM_IPROC
+	tristate "Broadcom iProc I2C controller"
+	depends on ARCH_BCM_IPROC || COMPILE_TEST
+	default ARCH_BCM_IPROC
+	help
+	  If you say yes to this option, support will be included for the
+	  Broadcom iProc I2C controller.
+
+	  If you don't know what to do here, say N.
+
 config I2C_BCM_KONA
 	tristate "BCM Kona I2C adapter"
 	depends on ARCH_BCM_MOBILE
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 56388f6..d93b509 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
 obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
 obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
 obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
+obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
 obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
 obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
 obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
new file mode 100644
index 0000000..64c622f
--- /dev/null
+++ b/drivers/i2c/busses/i2c-bcm-iproc.c
@@ -0,0 +1,505 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+
+#define CFG_OFFSET                   0x00
+#define CFG_RESET_SHIFT              31
+#define CFG_EN_SHIFT                 30
+#define CFG_M_RETRY_CNT_SHIFT        16
+#define CFG_M_RETRY_CNT_MASK         0x0f
+
+#define TIM_CFG_OFFSET               0x04
+#define TIM_CFG_MODE_400_SHIFT       31
+
+#define M_FIFO_CTRL_OFFSET           0x0c
+#define M_FIFO_RX_FLUSH_SHIFT        31
+#define M_FIFO_TX_FLUSH_SHIFT        30
+#define M_FIFO_RX_CNT_SHIFT          16
+#define M_FIFO_RX_CNT_MASK           0x7f
+#define M_FIFO_RX_THLD_SHIFT         8
+#define M_FIFO_RX_THLD_MASK          0x3f
+
+#define M_CMD_OFFSET                 0x30
+#define M_CMD_START_BUSY_SHIFT       31
+#define M_CMD_STATUS_SHIFT           25
+#define M_CMD_STATUS_MASK            0x07
+#define M_CMD_STATUS_SUCCESS         0x0
+#define M_CMD_STATUS_LOST_ARB        0x1
+#define M_CMD_STATUS_NACK_ADDR       0x2
+#define M_CMD_STATUS_NACK_DATA       0x3
+#define M_CMD_STATUS_TIMEOUT         0x4
+#define M_CMD_PROTOCOL_SHIFT         9
+#define M_CMD_PROTOCOL_MASK          0xf
+#define M_CMD_PROTOCOL_BLK_WR        0x7
+#define M_CMD_PROTOCOL_BLK_RD        0x8
+#define M_CMD_PEC_SHIFT              8
+#define M_CMD_RD_CNT_SHIFT           0
+#define M_CMD_RD_CNT_MASK            0xff
+
+#define IE_OFFSET                    0x38
+#define IE_M_RX_FIFO_FULL_SHIFT      31
+#define IE_M_RX_THLD_SHIFT           30
+#define IE_M_START_BUSY_SHIFT        28
+
+#define IS_OFFSET                    0x3c
+#define IS_M_RX_FIFO_FULL_SHIFT      31
+#define IS_M_RX_THLD_SHIFT           30
+#define IS_M_START_BUSY_SHIFT        28
+
+#define M_TX_OFFSET                  0x40
+#define M_TX_WR_STATUS_SHIFT         31
+#define M_TX_DATA_SHIFT              0
+#define M_TX_DATA_MASK               0xff
+
+#define M_RX_OFFSET                  0x44
+#define M_RX_STATUS_SHIFT            30
+#define M_RX_STATUS_MASK             0x03
+#define M_RX_PEC_ERR_SHIFT           29
+#define M_RX_DATA_SHIFT              0
+#define M_RX_DATA_MASK               0xff
+
+#define I2C_TIMEOUT_MESC             100
+#define M_TX_RX_FIFO_SIZE            64
+
+enum bus_speed_index {
+	I2C_SPD_100K = 0,
+	I2C_SPD_400K,
+};
+
+struct bcm_iproc_i2c_dev {
+	struct device *device;
+	int irq;
+
+	void __iomem *base;
+
+	struct i2c_adapter adapter;
+
+	struct completion done;
+	int xfer_is_done;
+};
+
+/*
+ * Can be expanded in the future if more interrupt status bits are utilized
+ */
+#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
+
+static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = data;
+	u32 status = readl(iproc_i2c->base + IS_OFFSET);
+
+	status &= ISR_MASK;
+
+	if (!status)
+		return IRQ_NONE;
+
+	writel(status, iproc_i2c->base + IS_OFFSET);
+	iproc_i2c->xfer_is_done = 1;
+	complete_all(&iproc_i2c->done);
+
+	return IRQ_HANDLED;
+}
+
+static bool bcm_iproc_i2c_bus_busy(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	if (readl(iproc_i2c->base + M_CMD_OFFSET) &
+	    (1 << M_CMD_START_BUSY_SHIFT))
+		return true;
+	else
+		return false;
+}
+
+static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *iproc_i2c,
+				     struct i2c_msg *msg, u8 *addr)
+{
+
+	if (msg->flags & I2C_M_TEN) {
+		dev_err(iproc_i2c->device, "no support for 10-bit address\n");
+		return -EINVAL;
+	}
+
+	*addr = msg->addr << 1;
+
+	if (msg->flags & I2C_M_RD)
+		*addr |= 1;
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *iproc_i2c,
+				      struct i2c_msg *msg)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + M_CMD_OFFSET);
+	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
+
+	switch (val) {
+	case M_CMD_STATUS_SUCCESS:
+		return 0;
+
+	case M_CMD_STATUS_LOST_ARB:
+		dev_dbg(iproc_i2c->device, "lost bus arbitration\n");
+		return -EAGAIN;
+
+	case M_CMD_STATUS_NACK_ADDR:
+		dev_dbg(iproc_i2c->device, "NAK addr:0x%02x\n", msg->addr);
+		return -ENXIO;
+
+	case M_CMD_STATUS_NACK_DATA:
+		dev_dbg(iproc_i2c->device, "NAK data\n");
+		return -ENXIO;
+
+	case M_CMD_STATUS_TIMEOUT:
+		dev_dbg(iproc_i2c->device, "bus timeout\n");
+		return -ETIMEDOUT;
+
+	default:
+		dev_dbg(iproc_i2c->device, "unknown error code=%d\n", val);
+		return -EIO;
+	}
+}
+
+static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *iproc_i2c,
+					 struct i2c_msg *msg)
+{
+	int ret, i;
+	u8 addr;
+	u32 val;
+	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	if (msg->len > M_TX_RX_FIFO_SIZE - 1) {
+		dev_err(iproc_i2c->device,
+			"only support data length up to %u bytes\n",
+			M_TX_RX_FIFO_SIZE - 1);
+		return -EINVAL;
+	}
+
+	if (bcm_iproc_i2c_bus_busy(iproc_i2c)) {
+		dev_warn(iproc_i2c->device, "bus is busy\n");
+		return -EBUSY;
+	}
+
+	ret = bcm_iproc_i2c_format_addr(iproc_i2c, msg, &addr);
+	if (ret)
+		return ret;
+
+	/* load slave address into the TX FIFO */
+	writel(addr, iproc_i2c->base + M_TX_OFFSET);
+
+	/* for a write transaction, load data into the TX FIFO */
+	if (!(msg->flags & I2C_M_RD)) {
+		for (i = 0; i < msg->len; i++) {
+			val = msg->buf[i];
+
+			/* mark the last byte */
+			if (i == msg->len - 1)
+				val |= 1 << M_TX_WR_STATUS_SHIFT;
+
+			writel(val, iproc_i2c->base + M_TX_OFFSET);
+		}
+
+		if (msg->len == 0)
+			writel(1 << M_TX_WR_STATUS_SHIFT,
+			       iproc_i2c->base + M_TX_OFFSET);
+	}
+
+	/* mark as incomplete before starting the transaction */
+	reinit_completion(&iproc_i2c->done);
+	iproc_i2c->xfer_is_done = 0;
+
+	/*
+	 * Enable the "start busy" interrupt, which will be triggered after the
+	 * transaction is done, i.e., the internal start_busy bit, transitions
+	 * from 1 to 0.
+	 */
+	writel(1 << IE_M_START_BUSY_SHIFT, iproc_i2c->base + IE_OFFSET);
+
+	/*
+	 * Now we can activate the transfer. For a read operation, specify the
+	 * number of bytes to read
+	 */
+	val = 1 << M_CMD_START_BUSY_SHIFT;
+	if (msg->flags & I2C_M_RD) {
+		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
+		       (msg->len << M_CMD_RD_CNT_SHIFT);
+	} else {
+		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
+	}
+	writel(val, iproc_i2c->base + M_CMD_OFFSET);
+
+	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+	/* read it back to flush the write */
+	readl(iproc_i2c->base + IE_OFFSET);
+
+	/* make sure the interrupt handler isn't running */
+	synchronize_irq(iproc_i2c->irq);
+
+	if (!time_left && !iproc_i2c->xfer_is_done) {
+		dev_err(iproc_i2c->device, "transaction timed out\n");
+
+		/* flush FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return -ETIMEDOUT;
+	}
+
+	ret = bcm_iproc_i2c_check_status(iproc_i2c, msg);
+	if (ret) {
+		/* flush both TX/RX FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return ret;
+	}
+
+	/*
+	 * For a read operation, we now need to load the data from FIFO
+	 * into the memory buffer
+	 */
+	if (msg->flags & I2C_M_RD) {
+		for (i = 0; i < msg->len; i++) {
+			msg->buf[i] = (readl(iproc_i2c->base + M_RX_OFFSET) >>
+				      M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
+		}
+	}
+
+	dev_dbg(iproc_i2c->device, "xfer %c, addr=0x%02x, len=%d\n",
+		(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
+		msg->len);
+	dev_dbg(iproc_i2c->device, "**** data start ****\n");
+	for (i = 0; i < msg->len; i++)
+		dev_dbg(iproc_i2c->device, "0x%02x ",  msg->buf[i]);
+	dev_dbg(iproc_i2c->device, "**** data end ****\n");
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
+			      struct i2c_msg msgs[], int num)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = i2c_get_adapdata(adapter);
+	int ret, i;
+
+	/* go through all messages */
+	for (i = 0; i < num; i++) {
+		ret = bcm_iproc_i2c_xfer_single_msg(iproc_i2c, &msgs[i]);
+		if (ret) {
+			dev_err(iproc_i2c->device, "xfer failed\n");
+			return ret;
+		}
+	}
+
+	return num;
+}
+
+static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm bcm_iproc_algo = {
+	.master_xfer = bcm_iproc_i2c_xfer,
+	.functionality = bcm_iproc_i2c_functionality,
+};
+
+static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	unsigned int bus_speed, speed_bit;
+	u32 val;
+	int ret = of_property_read_u32(iproc_i2c->device->of_node,
+				       "clock-frequency", &bus_speed);
+	if (ret < 0) {
+		dev_info(iproc_i2c->device,
+			"unable to interpret clock-frequency DT property\n");
+		bus_speed = 100000;
+	}
+
+	if (bus_speed < 100000) {
+		dev_err(iproc_i2c->device, "%d Hz bus speed not supported\n",
+			bus_speed);
+		dev_err(iproc_i2c->device,
+			"valid speeds are 100khz and 400khz\n");
+		return -EINVAL;
+	} else if (bus_speed < 400000) {
+		speed_bit = 0;
+	} else {
+		/* bus_speed >= 400000 */
+		speed_bit = 1;
+	}
+
+	val = readl(iproc_i2c->base + TIM_CFG_OFFSET);
+	val &= ~(1 << TIM_CFG_MODE_400_SHIFT);
+	val |= speed_bit << TIM_CFG_MODE_400_SHIFT;
+	writel(val, iproc_i2c->base + TIM_CFG_OFFSET);
+
+	dev_info(iproc_i2c->device, "bus set to %u Hz\n", bus_speed);
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	/* put controller in reset */
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val |= 1 << CFG_RESET_SHIFT;
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* wait 100 usec per spec */
+	udelay(100);
+
+	/* bring controller out of reset */
+	val &= ~(1 << CFG_RESET_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
+	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
+	writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+
+	/* clear all pending interrupts */
+	writel(0xffffffff, iproc_i2c->base + IS_OFFSET);
+
+	return 0;
+}
+
+static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val |= 1 << CFG_EN_SHIFT;
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+}
+
+static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+}
+
+static int bcm_iproc_i2c_probe(struct platform_device *pdev)
+{
+	int irq, ret = 0;
+	struct bcm_iproc_i2c_dev *iproc_i2c;
+	struct i2c_adapter *adap;
+	struct resource *res;
+
+	iproc_i2c = devm_kzalloc(&pdev->dev, sizeof(*iproc_i2c),
+				 GFP_KERNEL);
+	if (!iproc_i2c)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, iproc_i2c);
+	iproc_i2c->device = &pdev->dev;
+	init_completion(&iproc_i2c->done);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	iproc_i2c->base = devm_ioremap_resource(iproc_i2c->device, res);
+	if (IS_ERR(iproc_i2c->base))
+		return PTR_ERR(iproc_i2c->base);
+
+	ret = bcm_iproc_i2c_init(iproc_i2c);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_cfg_speed(iproc_i2c);
+	if (ret)
+		return ret;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq <= 0) {
+		dev_err(iproc_i2c->device, "no irq resource\n");
+		return irq;
+	}
+	iproc_i2c->irq = irq;
+
+	ret = devm_request_irq(iproc_i2c->device, irq, bcm_iproc_i2c_isr, 0,
+			       pdev->name, iproc_i2c);
+	if (ret < 0) {
+		dev_err(iproc_i2c->device, "unable to request irq %i\n", irq);
+		return ret;
+	}
+
+	bcm_iproc_i2c_enable(iproc_i2c);
+
+	adap = &iproc_i2c->adapter;
+	i2c_set_adapdata(adap, iproc_i2c);
+	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
+	adap->algo = &bcm_iproc_algo;
+	adap->dev.parent = &pdev->dev;
+	adap->dev.of_node = pdev->dev.of_node;
+
+	ret = i2c_add_adapter(adap);
+	if (ret) {
+		dev_err(iproc_i2c->device, "failed to add adapter\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_remove(struct platform_device *pdev)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
+
+	/* make sure there's no pending interrupt when we remove the adapter */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+	readl(iproc_i2c->base + IE_OFFSET);
+	synchronize_irq(iproc_i2c->irq);
+
+	i2c_del_adapter(&iproc_i2c->adapter);
+	bcm_iproc_i2c_disable(iproc_i2c);
+
+	return 0;
+}
+
+static const struct of_device_id bcm_iproc_i2c_of_match[] = {
+	{ .compatible = "brcm,iproc-i2c" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
+
+static struct platform_driver bcm_iproc_i2c_driver = {
+	.driver = {
+		.name = "bcm-iproc-i2c",
+		.of_match_table = bcm_iproc_i2c_of_match,
+	},
+	.probe = bcm_iproc_i2c_probe,
+	.remove = bcm_iproc_i2c_remove,
+};
+module_platform_driver(bcm_iproc_i2c_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v7 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

Add initial support to the Broadcom iProc I2C controller found in the
iProc family of SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has
a size of 64 bytes. The iProc I2C controller supports two bus speeds
including standard mode (100kHz) and fast mode (400kHz)

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/i2c/busses/Kconfig         |   10 +
 drivers/i2c/busses/Makefile        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c |  505 ++++++++++++++++++++++++++++++++++++
 3 files changed, 516 insertions(+)
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 31e8308..af76d23 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -372,6 +372,16 @@ config I2C_BCM2835
 	  This support is also available as a module.  If so, the module
 	  will be called i2c-bcm2835.
 
+config I2C_BCM_IPROC
+	tristate "Broadcom iProc I2C controller"
+	depends on ARCH_BCM_IPROC || COMPILE_TEST
+	default ARCH_BCM_IPROC
+	help
+	  If you say yes to this option, support will be included for the
+	  Broadcom iProc I2C controller.
+
+	  If you don't know what to do here, say N.
+
 config I2C_BCM_KONA
 	tristate "BCM Kona I2C adapter"
 	depends on ARCH_BCM_MOBILE
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 56388f6..d93b509 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
 obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
 obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
 obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
+obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
 obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
 obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
 obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
new file mode 100644
index 0000000..64c622f
--- /dev/null
+++ b/drivers/i2c/busses/i2c-bcm-iproc.c
@@ -0,0 +1,505 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+
+#define CFG_OFFSET                   0x00
+#define CFG_RESET_SHIFT              31
+#define CFG_EN_SHIFT                 30
+#define CFG_M_RETRY_CNT_SHIFT        16
+#define CFG_M_RETRY_CNT_MASK         0x0f
+
+#define TIM_CFG_OFFSET               0x04
+#define TIM_CFG_MODE_400_SHIFT       31
+
+#define M_FIFO_CTRL_OFFSET           0x0c
+#define M_FIFO_RX_FLUSH_SHIFT        31
+#define M_FIFO_TX_FLUSH_SHIFT        30
+#define M_FIFO_RX_CNT_SHIFT          16
+#define M_FIFO_RX_CNT_MASK           0x7f
+#define M_FIFO_RX_THLD_SHIFT         8
+#define M_FIFO_RX_THLD_MASK          0x3f
+
+#define M_CMD_OFFSET                 0x30
+#define M_CMD_START_BUSY_SHIFT       31
+#define M_CMD_STATUS_SHIFT           25
+#define M_CMD_STATUS_MASK            0x07
+#define M_CMD_STATUS_SUCCESS         0x0
+#define M_CMD_STATUS_LOST_ARB        0x1
+#define M_CMD_STATUS_NACK_ADDR       0x2
+#define M_CMD_STATUS_NACK_DATA       0x3
+#define M_CMD_STATUS_TIMEOUT         0x4
+#define M_CMD_PROTOCOL_SHIFT         9
+#define M_CMD_PROTOCOL_MASK          0xf
+#define M_CMD_PROTOCOL_BLK_WR        0x7
+#define M_CMD_PROTOCOL_BLK_RD        0x8
+#define M_CMD_PEC_SHIFT              8
+#define M_CMD_RD_CNT_SHIFT           0
+#define M_CMD_RD_CNT_MASK            0xff
+
+#define IE_OFFSET                    0x38
+#define IE_M_RX_FIFO_FULL_SHIFT      31
+#define IE_M_RX_THLD_SHIFT           30
+#define IE_M_START_BUSY_SHIFT        28
+
+#define IS_OFFSET                    0x3c
+#define IS_M_RX_FIFO_FULL_SHIFT      31
+#define IS_M_RX_THLD_SHIFT           30
+#define IS_M_START_BUSY_SHIFT        28
+
+#define M_TX_OFFSET                  0x40
+#define M_TX_WR_STATUS_SHIFT         31
+#define M_TX_DATA_SHIFT              0
+#define M_TX_DATA_MASK               0xff
+
+#define M_RX_OFFSET                  0x44
+#define M_RX_STATUS_SHIFT            30
+#define M_RX_STATUS_MASK             0x03
+#define M_RX_PEC_ERR_SHIFT           29
+#define M_RX_DATA_SHIFT              0
+#define M_RX_DATA_MASK               0xff
+
+#define I2C_TIMEOUT_MESC             100
+#define M_TX_RX_FIFO_SIZE            64
+
+enum bus_speed_index {
+	I2C_SPD_100K = 0,
+	I2C_SPD_400K,
+};
+
+struct bcm_iproc_i2c_dev {
+	struct device *device;
+	int irq;
+
+	void __iomem *base;
+
+	struct i2c_adapter adapter;
+
+	struct completion done;
+	int xfer_is_done;
+};
+
+/*
+ * Can be expanded in the future if more interrupt status bits are utilized
+ */
+#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
+
+static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = data;
+	u32 status = readl(iproc_i2c->base + IS_OFFSET);
+
+	status &= ISR_MASK;
+
+	if (!status)
+		return IRQ_NONE;
+
+	writel(status, iproc_i2c->base + IS_OFFSET);
+	iproc_i2c->xfer_is_done = 1;
+	complete_all(&iproc_i2c->done);
+
+	return IRQ_HANDLED;
+}
+
+static bool bcm_iproc_i2c_bus_busy(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	if (readl(iproc_i2c->base + M_CMD_OFFSET) &
+	    (1 << M_CMD_START_BUSY_SHIFT))
+		return true;
+	else
+		return false;
+}
+
+static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *iproc_i2c,
+				     struct i2c_msg *msg, u8 *addr)
+{
+
+	if (msg->flags & I2C_M_TEN) {
+		dev_err(iproc_i2c->device, "no support for 10-bit address\n");
+		return -EINVAL;
+	}
+
+	*addr = msg->addr << 1;
+
+	if (msg->flags & I2C_M_RD)
+		*addr |= 1;
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *iproc_i2c,
+				      struct i2c_msg *msg)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + M_CMD_OFFSET);
+	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
+
+	switch (val) {
+	case M_CMD_STATUS_SUCCESS:
+		return 0;
+
+	case M_CMD_STATUS_LOST_ARB:
+		dev_dbg(iproc_i2c->device, "lost bus arbitration\n");
+		return -EAGAIN;
+
+	case M_CMD_STATUS_NACK_ADDR:
+		dev_dbg(iproc_i2c->device, "NAK addr:0x%02x\n", msg->addr);
+		return -ENXIO;
+
+	case M_CMD_STATUS_NACK_DATA:
+		dev_dbg(iproc_i2c->device, "NAK data\n");
+		return -ENXIO;
+
+	case M_CMD_STATUS_TIMEOUT:
+		dev_dbg(iproc_i2c->device, "bus timeout\n");
+		return -ETIMEDOUT;
+
+	default:
+		dev_dbg(iproc_i2c->device, "unknown error code=%d\n", val);
+		return -EIO;
+	}
+}
+
+static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *iproc_i2c,
+					 struct i2c_msg *msg)
+{
+	int ret, i;
+	u8 addr;
+	u32 val;
+	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	if (msg->len > M_TX_RX_FIFO_SIZE - 1) {
+		dev_err(iproc_i2c->device,
+			"only support data length up to %u bytes\n",
+			M_TX_RX_FIFO_SIZE - 1);
+		return -EINVAL;
+	}
+
+	if (bcm_iproc_i2c_bus_busy(iproc_i2c)) {
+		dev_warn(iproc_i2c->device, "bus is busy\n");
+		return -EBUSY;
+	}
+
+	ret = bcm_iproc_i2c_format_addr(iproc_i2c, msg, &addr);
+	if (ret)
+		return ret;
+
+	/* load slave address into the TX FIFO */
+	writel(addr, iproc_i2c->base + M_TX_OFFSET);
+
+	/* for a write transaction, load data into the TX FIFO */
+	if (!(msg->flags & I2C_M_RD)) {
+		for (i = 0; i < msg->len; i++) {
+			val = msg->buf[i];
+
+			/* mark the last byte */
+			if (i == msg->len - 1)
+				val |= 1 << M_TX_WR_STATUS_SHIFT;
+
+			writel(val, iproc_i2c->base + M_TX_OFFSET);
+		}
+
+		if (msg->len == 0)
+			writel(1 << M_TX_WR_STATUS_SHIFT,
+			       iproc_i2c->base + M_TX_OFFSET);
+	}
+
+	/* mark as incomplete before starting the transaction */
+	reinit_completion(&iproc_i2c->done);
+	iproc_i2c->xfer_is_done = 0;
+
+	/*
+	 * Enable the "start busy" interrupt, which will be triggered after the
+	 * transaction is done, i.e., the internal start_busy bit, transitions
+	 * from 1 to 0.
+	 */
+	writel(1 << IE_M_START_BUSY_SHIFT, iproc_i2c->base + IE_OFFSET);
+
+	/*
+	 * Now we can activate the transfer. For a read operation, specify the
+	 * number of bytes to read
+	 */
+	val = 1 << M_CMD_START_BUSY_SHIFT;
+	if (msg->flags & I2C_M_RD) {
+		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
+		       (msg->len << M_CMD_RD_CNT_SHIFT);
+	} else {
+		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
+	}
+	writel(val, iproc_i2c->base + M_CMD_OFFSET);
+
+	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+	/* read it back to flush the write */
+	readl(iproc_i2c->base + IE_OFFSET);
+
+	/* make sure the interrupt handler isn't running */
+	synchronize_irq(iproc_i2c->irq);
+
+	if (!time_left && !iproc_i2c->xfer_is_done) {
+		dev_err(iproc_i2c->device, "transaction timed out\n");
+
+		/* flush FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return -ETIMEDOUT;
+	}
+
+	ret = bcm_iproc_i2c_check_status(iproc_i2c, msg);
+	if (ret) {
+		/* flush both TX/RX FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return ret;
+	}
+
+	/*
+	 * For a read operation, we now need to load the data from FIFO
+	 * into the memory buffer
+	 */
+	if (msg->flags & I2C_M_RD) {
+		for (i = 0; i < msg->len; i++) {
+			msg->buf[i] = (readl(iproc_i2c->base + M_RX_OFFSET) >>
+				      M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
+		}
+	}
+
+	dev_dbg(iproc_i2c->device, "xfer %c, addr=0x%02x, len=%d\n",
+		(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
+		msg->len);
+	dev_dbg(iproc_i2c->device, "**** data start ****\n");
+	for (i = 0; i < msg->len; i++)
+		dev_dbg(iproc_i2c->device, "0x%02x ",  msg->buf[i]);
+	dev_dbg(iproc_i2c->device, "**** data end ****\n");
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
+			      struct i2c_msg msgs[], int num)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = i2c_get_adapdata(adapter);
+	int ret, i;
+
+	/* go through all messages */
+	for (i = 0; i < num; i++) {
+		ret = bcm_iproc_i2c_xfer_single_msg(iproc_i2c, &msgs[i]);
+		if (ret) {
+			dev_err(iproc_i2c->device, "xfer failed\n");
+			return ret;
+		}
+	}
+
+	return num;
+}
+
+static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm bcm_iproc_algo = {
+	.master_xfer = bcm_iproc_i2c_xfer,
+	.functionality = bcm_iproc_i2c_functionality,
+};
+
+static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	unsigned int bus_speed, speed_bit;
+	u32 val;
+	int ret = of_property_read_u32(iproc_i2c->device->of_node,
+				       "clock-frequency", &bus_speed);
+	if (ret < 0) {
+		dev_info(iproc_i2c->device,
+			"unable to interpret clock-frequency DT property\n");
+		bus_speed = 100000;
+	}
+
+	if (bus_speed < 100000) {
+		dev_err(iproc_i2c->device, "%d Hz bus speed not supported\n",
+			bus_speed);
+		dev_err(iproc_i2c->device,
+			"valid speeds are 100khz and 400khz\n");
+		return -EINVAL;
+	} else if (bus_speed < 400000) {
+		speed_bit = 0;
+	} else {
+		/* bus_speed >= 400000 */
+		speed_bit = 1;
+	}
+
+	val = readl(iproc_i2c->base + TIM_CFG_OFFSET);
+	val &= ~(1 << TIM_CFG_MODE_400_SHIFT);
+	val |= speed_bit << TIM_CFG_MODE_400_SHIFT;
+	writel(val, iproc_i2c->base + TIM_CFG_OFFSET);
+
+	dev_info(iproc_i2c->device, "bus set to %u Hz\n", bus_speed);
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	/* put controller in reset */
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val |= 1 << CFG_RESET_SHIFT;
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* wait 100 usec per spec */
+	udelay(100);
+
+	/* bring controller out of reset */
+	val &= ~(1 << CFG_RESET_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
+	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
+	writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+
+	/* clear all pending interrupts */
+	writel(0xffffffff, iproc_i2c->base + IS_OFFSET);
+
+	return 0;
+}
+
+static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val |= 1 << CFG_EN_SHIFT;
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+}
+
+static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+}
+
+static int bcm_iproc_i2c_probe(struct platform_device *pdev)
+{
+	int irq, ret = 0;
+	struct bcm_iproc_i2c_dev *iproc_i2c;
+	struct i2c_adapter *adap;
+	struct resource *res;
+
+	iproc_i2c = devm_kzalloc(&pdev->dev, sizeof(*iproc_i2c),
+				 GFP_KERNEL);
+	if (!iproc_i2c)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, iproc_i2c);
+	iproc_i2c->device = &pdev->dev;
+	init_completion(&iproc_i2c->done);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	iproc_i2c->base = devm_ioremap_resource(iproc_i2c->device, res);
+	if (IS_ERR(iproc_i2c->base))
+		return PTR_ERR(iproc_i2c->base);
+
+	ret = bcm_iproc_i2c_init(iproc_i2c);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_cfg_speed(iproc_i2c);
+	if (ret)
+		return ret;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq <= 0) {
+		dev_err(iproc_i2c->device, "no irq resource\n");
+		return irq;
+	}
+	iproc_i2c->irq = irq;
+
+	ret = devm_request_irq(iproc_i2c->device, irq, bcm_iproc_i2c_isr, 0,
+			       pdev->name, iproc_i2c);
+	if (ret < 0) {
+		dev_err(iproc_i2c->device, "unable to request irq %i\n", irq);
+		return ret;
+	}
+
+	bcm_iproc_i2c_enable(iproc_i2c);
+
+	adap = &iproc_i2c->adapter;
+	i2c_set_adapdata(adap, iproc_i2c);
+	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
+	adap->algo = &bcm_iproc_algo;
+	adap->dev.parent = &pdev->dev;
+	adap->dev.of_node = pdev->dev.of_node;
+
+	ret = i2c_add_adapter(adap);
+	if (ret) {
+		dev_err(iproc_i2c->device, "failed to add adapter\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_remove(struct platform_device *pdev)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
+
+	/* make sure there's no pending interrupt when we remove the adapter */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+	readl(iproc_i2c->base + IE_OFFSET);
+	synchronize_irq(iproc_i2c->irq);
+
+	i2c_del_adapter(&iproc_i2c->adapter);
+	bcm_iproc_i2c_disable(iproc_i2c);
+
+	return 0;
+}
+
+static const struct of_device_id bcm_iproc_i2c_of_match[] = {
+	{ .compatible = "brcm,iproc-i2c" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
+
+static struct platform_driver bcm_iproc_i2c_driver = {
+	.driver = {
+		.name = "bcm-iproc-i2c",
+		.of_match_table = bcm_iproc_i2c_of_match,
+	},
+	.probe = bcm_iproc_i2c_probe,
+	.remove = bcm_iproc_i2c_remove,
+};
+module_platform_driver(bcm_iproc_i2c_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v7 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
them disabled there. Individual I2C devices can be enabled in board
specific dts file when I2C slave devices are enabled in the future

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..ff5fb6a 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -70,6 +70,26 @@
 		};
 	};
 
+	i2c0: i2c@18008000 {
+		compatible = "brcm,cygnus-iproc-i2c", "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
+	i2c1: i2c@1800b000 {
+		compatible = "brcm,cygnus-iproc-i2c", "brcm,iproc-i2c";
+		reg = <0x1800b000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 86 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
 	uart0: serial@18020000 {
 		compatible = "snps,dw-apb-uart";
 		reg = <0x18020000 0x100>;
-- 
1.7.9.5

[PATCH v7 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
them disabled there. Individual I2C devices can be enabled in board
specific dts file when I2C slave devices are enabled in the future

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..ff5fb6a 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -70,6 +70,26 @@
 		};
 	};
 
+	i2c0: i2c@18008000 {
+		compatible = "brcm,cygnus-iproc-i2c", "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
+	i2c1: i2c@1800b000 {
+		compatible = "brcm,cygnus-iproc-i2c", "brcm,iproc-i2c";
+		reg = <0x1800b000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 86 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
 	uart0: serial@18020000 {
 		compatible = "snps,dw-apb-uart";
 		reg = <0x18020000 0x100>;
-- 
1.7.9.5

[PATCH v7 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
them disabled there. Individual I2C devices can be enabled in board
specific dts file when I2C slave devices are enabled in the future

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..ff5fb6a 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -70,6 +70,26 @@
 		};
 	};
 
+	i2c0: i2c at 18008000 {
+		compatible = "brcm,cygnus-iproc-i2c", "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
+	i2c1: i2c at 1800b000 {
+		compatible = "brcm,cygnus-iproc-i2c", "brcm,iproc-i2c";
+		reg = <0x1800b000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 86 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
 	uart0: serial at 18020000 {
 		compatible = "snps,dw-apb-uart";
 		reg = <0x18020000 0x100>;
-- 
1.7.9.5

Re: [PATCH v6 2/3] gpio: Cygnus: add GPIO driver

[Linus Walleij]

On Sat, Jan 17, 2015 at 1:11 AM, Ray Jui <rjui@broadcom.com> wrote:
> On 1/16/2015 2:14 AM, Linus Walleij wrote:

>> Some hardware designs put the software-controlled biasing
>> resistors in the GPIO block electronically connected to the actual
>> pins, so that e.g. the biasing will be available if some MMC or
>> whatever is using the same pins in another muxing. In such
>> situations it's quite evident that they need to be a combined
>> GPIO and pin controller.
>>
>> I have some regrets that bolting a second pin controller to the
>> GPIO chip make things a bit complex but it's a price we have
>> to pay for getting some kind of generic interface.
>
> Okay. In summary, I think both of us think the following approach makes
> sense in my situation:
> - leave pinmux in pinctrl-bcm-cygnus.c
> - leave pinctrl + gpio in pinctrl-bcm-cygnus-gpio.c under drivers/pinctrl/*
>
> But by thinking about this more, I thought this would create duplicated
> pinctrl descriptors in our system, one from the pinmux driver, and the
> other from this pinctrl+gpio driver. That is probably undesirable?

No, there are several systems with multiple pin controllers and the
framework easily handles multiple pin controllers in the same
system just as well as we handle multiple GPIO chips.

> By reviewing various drivers in the pinctrl directory, I found what
> pinctrl-u300.c and pinctrl-coh901.c does seems to serve as a good model
> for me to follow:
> - pinctrl-u300.c is the pinmux driver
> - pinctrl-coh901.c is the gpio+pinctrl driver

Yeah, I don't know if the separation between them is as beautiful
as it should be. I used it when developing the pin control
subsystem.

> The GPIO pinctrl logic is in the coh901 block, so pinctrl-coh901.c
> exposed two public functions u300_gpio_config_get, u300_gpio_config_set
> that pinctrl-u300.c can use. The u300 populates all pinmux/pinctrl
> related functions into the subsystem. This way there's only one pinctrl
> descriptor, populated through pinctrl-u300.c.
>
> Does that model make more sense to you?

Yeah I wrote it myself so I'm maybe blind for any dumbness in
the code. But I think it's kind of elegant. But it is not using the
generic pinctrl device tree bindings so it's kind of oldstyle and
bloated in that sense.

Yours,
Linus Walleij

Re: [PATCH v6 2/3] gpio: Cygnus: add GPIO driver

[Linus Walleij]

On Sat, Jan 17, 2015 at 1:11 AM, Ray Jui <rjui@broadcom.com> wrote:
> On 1/16/2015 2:14 AM, Linus Walleij wrote:

>> Some hardware designs put the software-controlled biasing
>> resistors in the GPIO block electronically connected to the actual
>> pins, so that e.g. the biasing will be available if some MMC or
>> whatever is using the same pins in another muxing. In such
>> situations it's quite evident that they need to be a combined
>> GPIO and pin controller.
>>
>> I have some regrets that bolting a second pin controller to the
>> GPIO chip make things a bit complex but it's a price we have
>> to pay for getting some kind of generic interface.
>
> Okay. In summary, I think both of us think the following approach makes
> sense in my situation:
> - leave pinmux in pinctrl-bcm-cygnus.c
> - leave pinctrl + gpio in pinctrl-bcm-cygnus-gpio.c under drivers/pinctrl/*
>
> But by thinking about this more, I thought this would create duplicated
> pinctrl descriptors in our system, one from the pinmux driver, and the
> other from this pinctrl+gpio driver. That is probably undesirable?

No, there are several systems with multiple pin controllers and the
framework easily handles multiple pin controllers in the same
system just as well as we handle multiple GPIO chips.

> By reviewing various drivers in the pinctrl directory, I found what
> pinctrl-u300.c and pinctrl-coh901.c does seems to serve as a good model
> for me to follow:
> - pinctrl-u300.c is the pinmux driver
> - pinctrl-coh901.c is the gpio+pinctrl driver

Yeah, I don't know if the separation between them is as beautiful
as it should be. I used it when developing the pin control
subsystem.

> The GPIO pinctrl logic is in the coh901 block, so pinctrl-coh901.c
> exposed two public functions u300_gpio_config_get, u300_gpio_config_set
> that pinctrl-u300.c can use. The u300 populates all pinmux/pinctrl
> related functions into the subsystem. This way there's only one pinctrl
> descriptor, populated through pinctrl-u300.c.
>
> Does that model make more sense to you?

Yeah I wrote it myself so I'm maybe blind for any dumbness in
the code. But I think it's kind of elegant. But it is not using the
generic pinctrl device tree bindings so it's kind of oldstyle and
bloated in that sense.

Yours,
Linus Walleij

[PATCH v6 2/3] gpio: Cygnus: add GPIO driver

[Linus Walleij]

On Sat, Jan 17, 2015 at 1:11 AM, Ray Jui <rjui@broadcom.com> wrote:
> On 1/16/2015 2:14 AM, Linus Walleij wrote:

>> Some hardware designs put the software-controlled biasing
>> resistors in the GPIO block electronically connected to the actual
>> pins, so that e.g. the biasing will be available if some MMC or
>> whatever is using the same pins in another muxing. In such
>> situations it's quite evident that they need to be a combined
>> GPIO and pin controller.
>>
>> I have some regrets that bolting a second pin controller to the
>> GPIO chip make things a bit complex but it's a price we have
>> to pay for getting some kind of generic interface.
>
> Okay. In summary, I think both of us think the following approach makes
> sense in my situation:
> - leave pinmux in pinctrl-bcm-cygnus.c
> - leave pinctrl + gpio in pinctrl-bcm-cygnus-gpio.c under drivers/pinctrl/*
>
> But by thinking about this more, I thought this would create duplicated
> pinctrl descriptors in our system, one from the pinmux driver, and the
> other from this pinctrl+gpio driver. That is probably undesirable?

No, there are several systems with multiple pin controllers and the
framework easily handles multiple pin controllers in the same
system just as well as we handle multiple GPIO chips.

> By reviewing various drivers in the pinctrl directory, I found what
> pinctrl-u300.c and pinctrl-coh901.c does seems to serve as a good model
> for me to follow:
> - pinctrl-u300.c is the pinmux driver
> - pinctrl-coh901.c is the gpio+pinctrl driver

Yeah, I don't know if the separation between them is as beautiful
as it should be. I used it when developing the pin control
subsystem.

> The GPIO pinctrl logic is in the coh901 block, so pinctrl-coh901.c
> exposed two public functions u300_gpio_config_get, u300_gpio_config_set
> that pinctrl-u300.c can use. The u300 populates all pinmux/pinctrl
> related functions into the subsystem. This way there's only one pinctrl
> descriptor, populated through pinctrl-u300.c.
>
> Does that model make more sense to you?

Yeah I wrote it myself so I'm maybe blind for any dumbness in
the code. But I think it's kind of elegant. But it is not using the
generic pinctrl device tree bindings so it's kind of oldstyle and
bloated in that sense.

Yours,
Linus Walleij

Re: [PATCH v6 2/3] gpio: Cygnus: add GPIO driver

[Ray Jui]

On 1/20/2015 1:53 AM, Linus Walleij wrote:
> On Sat, Jan 17, 2015 at 1:11 AM, Ray Jui <rjui@broadcom.com> wrote:
>> On 1/16/2015 2:14 AM, Linus Walleij wrote:
> 
>>> Some hardware designs put the software-controlled biasing
>>> resistors in the GPIO block electronically connected to the actual
>>> pins, so that e.g. the biasing will be available if some MMC or
>>> whatever is using the same pins in another muxing. In such
>>> situations it's quite evident that they need to be a combined
>>> GPIO and pin controller.
>>>
>>> I have some regrets that bolting a second pin controller to the
>>> GPIO chip make things a bit complex but it's a price we have
>>> to pay for getting some kind of generic interface.
>>
>> Okay. In summary, I think both of us think the following approach makes
>> sense in my situation:
>> - leave pinmux in pinctrl-bcm-cygnus.c
>> - leave pinctrl + gpio in pinctrl-bcm-cygnus-gpio.c under drivers/pinctrl/*
>>
>> But by thinking about this more, I thought this would create duplicated
>> pinctrl descriptors in our system, one from the pinmux driver, and the
>> other from this pinctrl+gpio driver. That is probably undesirable?
> 
> No, there are several systems with multiple pin controllers and the
> framework easily handles multiple pin controllers in the same
> system just as well as we handle multiple GPIO chips.
> 
>> By reviewing various drivers in the pinctrl directory, I found what
>> pinctrl-u300.c and pinctrl-coh901.c does seems to serve as a good model
>> for me to follow:
>> - pinctrl-u300.c is the pinmux driver
>> - pinctrl-coh901.c is the gpio+pinctrl driver
> 
> Yeah, I don't know if the separation between them is as beautiful
> as it should be. I used it when developing the pin control
> subsystem.
> 
>> The GPIO pinctrl logic is in the coh901 block, so pinctrl-coh901.c
>> exposed two public functions u300_gpio_config_get, u300_gpio_config_set
>> that pinctrl-u300.c can use. The u300 populates all pinmux/pinctrl
>> related functions into the subsystem. This way there's only one pinctrl
>> descriptor, populated through pinctrl-u300.c.
>>
>> Does that model make more sense to you?
> 
> Yeah I wrote it myself so I'm maybe blind for any dumbness in
> the code. But I think it's kind of elegant. But it is not using the
> generic pinctrl device tree bindings so it's kind of oldstyle and
> bloated in that sense.
> 
> Yours,
> Linus Walleij
> 
Okay. I think I have a pretty good idea of what you expect. Regarding
whether or not to keep pinctrl-bcm-cygnus.c and
pinctrl-bcm-cygnus-gpio.c completely independent with each other and
therefore have two pinctrl in the system, I'll play with it a bit more
and make a decision.

Thanks a lot for spending all these time explaining it to me. Really
appreciate it!

Re: [PATCH v6 2/3] gpio: Cygnus: add GPIO driver

[Ray Jui]

On 1/20/2015 1:53 AM, Linus Walleij wrote:
> On Sat, Jan 17, 2015 at 1:11 AM, Ray Jui <rjui@broadcom.com> wrote:
>> On 1/16/2015 2:14 AM, Linus Walleij wrote:
> 
>>> Some hardware designs put the software-controlled biasing
>>> resistors in the GPIO block electronically connected to the actual
>>> pins, so that e.g. the biasing will be available if some MMC or
>>> whatever is using the same pins in another muxing. In such
>>> situations it's quite evident that they need to be a combined
>>> GPIO and pin controller.
>>>
>>> I have some regrets that bolting a second pin controller to the
>>> GPIO chip make things a bit complex but it's a price we have
>>> to pay for getting some kind of generic interface.
>>
>> Okay. In summary, I think both of us think the following approach makes
>> sense in my situation:
>> - leave pinmux in pinctrl-bcm-cygnus.c
>> - leave pinctrl + gpio in pinctrl-bcm-cygnus-gpio.c under drivers/pinctrl/*
>>
>> But by thinking about this more, I thought this would create duplicated
>> pinctrl descriptors in our system, one from the pinmux driver, and the
>> other from this pinctrl+gpio driver. That is probably undesirable?
> 
> No, there are several systems with multiple pin controllers and the
> framework easily handles multiple pin controllers in the same
> system just as well as we handle multiple GPIO chips.
> 
>> By reviewing various drivers in the pinctrl directory, I found what
>> pinctrl-u300.c and pinctrl-coh901.c does seems to serve as a good model
>> for me to follow:
>> - pinctrl-u300.c is the pinmux driver
>> - pinctrl-coh901.c is the gpio+pinctrl driver
> 
> Yeah, I don't know if the separation between them is as beautiful
> as it should be. I used it when developing the pin control
> subsystem.
> 
>> The GPIO pinctrl logic is in the coh901 block, so pinctrl-coh901.c
>> exposed two public functions u300_gpio_config_get, u300_gpio_config_set
>> that pinctrl-u300.c can use. The u300 populates all pinmux/pinctrl
>> related functions into the subsystem. This way there's only one pinctrl
>> descriptor, populated through pinctrl-u300.c.
>>
>> Does that model make more sense to you?
> 
> Yeah I wrote it myself so I'm maybe blind for any dumbness in
> the code. But I think it's kind of elegant. But it is not using the
> generic pinctrl device tree bindings so it's kind of oldstyle and
> bloated in that sense.
> 
> Yours,
> Linus Walleij
> 
Okay. I think I have a pretty good idea of what you expect. Regarding
whether or not to keep pinctrl-bcm-cygnus.c and
pinctrl-bcm-cygnus-gpio.c completely independent with each other and
therefore have two pinctrl in the system, I'll play with it a bit more
and make a decision.

Thanks a lot for spending all these time explaining it to me. Really
appreciate it!

[PATCH v6 2/3] gpio: Cygnus: add GPIO driver

[Ray Jui]

On 1/20/2015 1:53 AM, Linus Walleij wrote:
> On Sat, Jan 17, 2015 at 1:11 AM, Ray Jui <rjui@broadcom.com> wrote:
>> On 1/16/2015 2:14 AM, Linus Walleij wrote:
> 
>>> Some hardware designs put the software-controlled biasing
>>> resistors in the GPIO block electronically connected to the actual
>>> pins, so that e.g. the biasing will be available if some MMC or
>>> whatever is using the same pins in another muxing. In such
>>> situations it's quite evident that they need to be a combined
>>> GPIO and pin controller.
>>>
>>> I have some regrets that bolting a second pin controller to the
>>> GPIO chip make things a bit complex but it's a price we have
>>> to pay for getting some kind of generic interface.
>>
>> Okay. In summary, I think both of us think the following approach makes
>> sense in my situation:
>> - leave pinmux in pinctrl-bcm-cygnus.c
>> - leave pinctrl + gpio in pinctrl-bcm-cygnus-gpio.c under drivers/pinctrl/*
>>
>> But by thinking about this more, I thought this would create duplicated
>> pinctrl descriptors in our system, one from the pinmux driver, and the
>> other from this pinctrl+gpio driver. That is probably undesirable?
> 
> No, there are several systems with multiple pin controllers and the
> framework easily handles multiple pin controllers in the same
> system just as well as we handle multiple GPIO chips.
> 
>> By reviewing various drivers in the pinctrl directory, I found what
>> pinctrl-u300.c and pinctrl-coh901.c does seems to serve as a good model
>> for me to follow:
>> - pinctrl-u300.c is the pinmux driver
>> - pinctrl-coh901.c is the gpio+pinctrl driver
> 
> Yeah, I don't know if the separation between them is as beautiful
> as it should be. I used it when developing the pin control
> subsystem.
> 
>> The GPIO pinctrl logic is in the coh901 block, so pinctrl-coh901.c
>> exposed two public functions u300_gpio_config_get, u300_gpio_config_set
>> that pinctrl-u300.c can use. The u300 populates all pinmux/pinctrl
>> related functions into the subsystem. This way there's only one pinctrl
>> descriptor, populated through pinctrl-u300.c.
>>
>> Does that model make more sense to you?
> 
> Yeah I wrote it myself so I'm maybe blind for any dumbness in
> the code. But I think it's kind of elegant. But it is not using the
> generic pinctrl device tree bindings so it's kind of oldstyle and
> bloated in that sense.
> 
> Yours,
> Linus Walleij
> 
Okay. I think I have a pretty good idea of what you expect. Regarding
whether or not to keep pinctrl-bcm-cygnus.c and
pinctrl-bcm-cygnus-gpio.c completely independent with each other and
therefore have two pinctrl in the system, I'll play with it a bit more
and make a decision.

Thanks a lot for spending all these time explaining it to me. Really
appreciate it!

Re: [PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Ray Jui]

On 1/13/2015 12:20 AM, Linus Walleij wrote:
> On Fri, Jan 9, 2015 at 7:26 PM, Ray Jui <rjui@broadcom.com> wrote:
>> On 1/9/2015 2:12 AM, Linus Walleij wrote:
> 
>>> Just use "groups" and "function" and refer to
>>> Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
>>>
>>> Then "alt1", "alt2" etc are non-functional names of functions.
>>> Use the real function names, like "spi0" or so. This
>>> alt-business seems to be just a shortcut to make it
>>> simple, don't do that.
>>>
>>> Then you use e.g. "spi0" as a group name. I prefer you
>>> call that "spi0_grp" or something to say it is a group of
>>> pins associated with spi0, as spi0 is actually the
>>> function.
>>>
>> Hmmm, I did this by following brcm,bcm11351-pinctrl.txt:
>> - function: String. Specifies the pin mux selection. Values must be one
>> of: "alt1", "alt2", "alt3", "alt4"
>>
>> But you are right, in the pinctrl binding document it describes the
>> generic pin multiplexing nodes use "function" and "group".
> 
> Note "function" and "groups". Note groups is pluralis. You can
> select multiple groups for a single function.
> 
>> For example, the group "lcd" covers 30 pins. When I configure "lcd" to
>> alternate function 1, all 30 pins are muxed to LCD function. When
>> configured to function 2, all pins are muxed to SRAM function. Now, here
>> comes the issue, when configured to function 3, pins 1-15 and 20-30
>> become GPIO function, but pins 16-19 becomes SPI5 function. When it's
>> configured to function 4, all 30 pins become GPIO.
> 
> I would split the use case in two groups for LCD and SRAM,
> and three groups for GPIO:
> "lcd_grp", "sram_grp", "gpio-1-15_grp",
> "gpio-16-19_grp", "gpio-20-30_grp", "spi5_grp"
> 
> Valid combinations become
> 
> function = "lcd"
> groups = "lcd_grp";
> 
> function = "sram"
> groups = "sram_grp"
> 
> For all GPIO only this:
> 
> function = "gpio"
> groups = "gpio-1-16_grp", "gpio-16-19_grp", "gpio-20-30_grp"
> 
> For a combined GPIO+SPI:
> 
> function = "gpio"
> groups = "gpio-1-16_grp", "gpio-20-30_grp"
> 
> function = "spi5"
> groups = "spi5_grp"
> 
> The pinctrl runtile will protest if you try to combine spi5_grp
> with gpio-16-19_grp.
> 
>> In some other cases, when I configure a group to other functions, there
>> could be spare pins which become unused (not brought out to the pad).
>> Or, the spare pins may also become a separate function.
> 
> That's cool.
> 
>> Based on the LCD example, I'd assume I would do the following for the
>> default LCD function:
>>
>> lcd_node {
>>         group = "lcd_grp";
>>         function = "lcd";
>> };
>>
>> And in the case of function 3, I would call the function "spi5" and
>> assume the rest of pins become either GPIO (or unused)?
>>
>> spi5_node {
>>         group = "lcd_grp";
>>         function = "spi5";
>> };
> 
> Looks cool per above.
> 
> You need some clever code in the driver to handle double-configuration
> of registers and so on, but I think it can be done.
> 
> Using pin control as a GPIO backend can be a bit tricky and will need
> some testing and elaboration, but the subsystem will block collisions.
> 
> Yours,
> Linus Walleij
> 

Hi Linus,

I have another question here. In the B0 revision of our Cygnus chip, the
ASIC team added a feature to allow individual pins to be muxed to GPIO.
The pinmux controller can still only do group-based muxing in general,
but at the same time, you can override most (but not all) individual
pins to GPIO.

I believe this HW design actually forces us to mix use "groups" and
"pins" in DT.

For example, assuming we mux pins 1 - 10 as MMC (one cmd line, one clk
line, and 8 data lines). One might make the decision that he only needs
4 data lines instead of 8 data lines, and he wants to free up the 4 data
lines and uses as GPIO. Based on this example, is the following DT
configuration valid?

sd_node {
    function = "sd";
    groups = "sd_grps";
};

gpio_node {
    function = "gpio";
    pins = "gpio_7", "gpio_8", "gpio_9", "gpio_10"; /* assuming 1:1
mapping between gpio and pin number to make this example simple */
};

Thanks,

Ray

Re: [PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Ray Jui]

On 1/13/2015 12:20 AM, Linus Walleij wrote:
> On Fri, Jan 9, 2015 at 7:26 PM, Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org> wrote:
>> On 1/9/2015 2:12 AM, Linus Walleij wrote:
> 
>>> Just use "groups" and "function" and refer to
>>> Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
>>>
>>> Then "alt1", "alt2" etc are non-functional names of functions.
>>> Use the real function names, like "spi0" or so. This
>>> alt-business seems to be just a shortcut to make it
>>> simple, don't do that.
>>>
>>> Then you use e.g. "spi0" as a group name. I prefer you
>>> call that "spi0_grp" or something to say it is a group of
>>> pins associated with spi0, as spi0 is actually the
>>> function.
>>>
>> Hmmm, I did this by following brcm,bcm11351-pinctrl.txt:
>> - function: String. Specifies the pin mux selection. Values must be one
>> of: "alt1", "alt2", "alt3", "alt4"
>>
>> But you are right, in the pinctrl binding document it describes the
>> generic pin multiplexing nodes use "function" and "group".
> 
> Note "function" and "groups". Note groups is pluralis. You can
> select multiple groups for a single function.
> 
>> For example, the group "lcd" covers 30 pins. When I configure "lcd" to
>> alternate function 1, all 30 pins are muxed to LCD function. When
>> configured to function 2, all pins are muxed to SRAM function. Now, here
>> comes the issue, when configured to function 3, pins 1-15 and 20-30
>> become GPIO function, but pins 16-19 becomes SPI5 function. When it's
>> configured to function 4, all 30 pins become GPIO.
> 
> I would split the use case in two groups for LCD and SRAM,
> and three groups for GPIO:
> "lcd_grp", "sram_grp", "gpio-1-15_grp",
> "gpio-16-19_grp", "gpio-20-30_grp", "spi5_grp"
> 
> Valid combinations become
> 
> function = "lcd"
> groups = "lcd_grp";
> 
> function = "sram"
> groups = "sram_grp"
> 
> For all GPIO only this:
> 
> function = "gpio"
> groups = "gpio-1-16_grp", "gpio-16-19_grp", "gpio-20-30_grp"
> 
> For a combined GPIO+SPI:
> 
> function = "gpio"
> groups = "gpio-1-16_grp", "gpio-20-30_grp"
> 
> function = "spi5"
> groups = "spi5_grp"
> 
> The pinctrl runtile will protest if you try to combine spi5_grp
> with gpio-16-19_grp.
> 
>> In some other cases, when I configure a group to other functions, there
>> could be spare pins which become unused (not brought out to the pad).
>> Or, the spare pins may also become a separate function.
> 
> That's cool.
> 
>> Based on the LCD example, I'd assume I would do the following for the
>> default LCD function:
>>
>> lcd_node {
>>         group = "lcd_grp";
>>         function = "lcd";
>> };
>>
>> And in the case of function 3, I would call the function "spi5" and
>> assume the rest of pins become either GPIO (or unused)?
>>
>> spi5_node {
>>         group = "lcd_grp";
>>         function = "spi5";
>> };
> 
> Looks cool per above.
> 
> You need some clever code in the driver to handle double-configuration
> of registers and so on, but I think it can be done.
> 
> Using pin control as a GPIO backend can be a bit tricky and will need
> some testing and elaboration, but the subsystem will block collisions.
> 
> Yours,
> Linus Walleij
> 

Hi Linus,

I have another question here. In the B0 revision of our Cygnus chip, the
ASIC team added a feature to allow individual pins to be muxed to GPIO.
The pinmux controller can still only do group-based muxing in general,
but at the same time, you can override most (but not all) individual
pins to GPIO.

I believe this HW design actually forces us to mix use "groups" and
"pins" in DT.

For example, assuming we mux pins 1 - 10 as MMC (one cmd line, one clk
line, and 8 data lines). One might make the decision that he only needs
4 data lines instead of 8 data lines, and he wants to free up the 4 data
lines and uses as GPIO. Based on this example, is the following DT
configuration valid?

sd_node {
    function = "sd";
    groups = "sd_grps";
};

gpio_node {
    function = "gpio";
    pins = "gpio_7", "gpio_8", "gpio_9", "gpio_10"; /* assuming 1:1
mapping between gpio and pin number to make this example simple */
};

Thanks,

Ray
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[PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Ray Jui]

On 1/13/2015 12:20 AM, Linus Walleij wrote:
> On Fri, Jan 9, 2015 at 7:26 PM, Ray Jui <rjui@broadcom.com> wrote:
>> On 1/9/2015 2:12 AM, Linus Walleij wrote:
> 
>>> Just use "groups" and "function" and refer to
>>> Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
>>>
>>> Then "alt1", "alt2" etc are non-functional names of functions.
>>> Use the real function names, like "spi0" or so. This
>>> alt-business seems to be just a shortcut to make it
>>> simple, don't do that.
>>>
>>> Then you use e.g. "spi0" as a group name. I prefer you
>>> call that "spi0_grp" or something to say it is a group of
>>> pins associated with spi0, as spi0 is actually the
>>> function.
>>>
>> Hmmm, I did this by following brcm,bcm11351-pinctrl.txt:
>> - function: String. Specifies the pin mux selection. Values must be one
>> of: "alt1", "alt2", "alt3", "alt4"
>>
>> But you are right, in the pinctrl binding document it describes the
>> generic pin multiplexing nodes use "function" and "group".
> 
> Note "function" and "groups". Note groups is pluralis. You can
> select multiple groups for a single function.
> 
>> For example, the group "lcd" covers 30 pins. When I configure "lcd" to
>> alternate function 1, all 30 pins are muxed to LCD function. When
>> configured to function 2, all pins are muxed to SRAM function. Now, here
>> comes the issue, when configured to function 3, pins 1-15 and 20-30
>> become GPIO function, but pins 16-19 becomes SPI5 function. When it's
>> configured to function 4, all 30 pins become GPIO.
> 
> I would split the use case in two groups for LCD and SRAM,
> and three groups for GPIO:
> "lcd_grp", "sram_grp", "gpio-1-15_grp",
> "gpio-16-19_grp", "gpio-20-30_grp", "spi5_grp"
> 
> Valid combinations become
> 
> function = "lcd"
> groups = "lcd_grp";
> 
> function = "sram"
> groups = "sram_grp"
> 
> For all GPIO only this:
> 
> function = "gpio"
> groups = "gpio-1-16_grp", "gpio-16-19_grp", "gpio-20-30_grp"
> 
> For a combined GPIO+SPI:
> 
> function = "gpio"
> groups = "gpio-1-16_grp", "gpio-20-30_grp"
> 
> function = "spi5"
> groups = "spi5_grp"
> 
> The pinctrl runtile will protest if you try to combine spi5_grp
> with gpio-16-19_grp.
> 
>> In some other cases, when I configure a group to other functions, there
>> could be spare pins which become unused (not brought out to the pad).
>> Or, the spare pins may also become a separate function.
> 
> That's cool.
> 
>> Based on the LCD example, I'd assume I would do the following for the
>> default LCD function:
>>
>> lcd_node {
>>         group = "lcd_grp";
>>         function = "lcd";
>> };
>>
>> And in the case of function 3, I would call the function "spi5" and
>> assume the rest of pins become either GPIO (or unused)?
>>
>> spi5_node {
>>         group = "lcd_grp";
>>         function = "spi5";
>> };
> 
> Looks cool per above.
> 
> You need some clever code in the driver to handle double-configuration
> of registers and so on, but I think it can be done.
> 
> Using pin control as a GPIO backend can be a bit tricky and will need
> some testing and elaboration, but the subsystem will block collisions.
> 
> Yours,
> Linus Walleij
> 

Hi Linus,

I have another question here. In the B0 revision of our Cygnus chip, the
ASIC team added a feature to allow individual pins to be muxed to GPIO.
The pinmux controller can still only do group-based muxing in general,
but at the same time, you can override most (but not all) individual
pins to GPIO.

I believe this HW design actually forces us to mix use "groups" and
"pins" in DT.

For example, assuming we mux pins 1 - 10 as MMC (one cmd line, one clk
line, and 8 data lines). One might make the decision that he only needs
4 data lines instead of 8 data lines, and he wants to free up the 4 data
lines and uses as GPIO. Based on this example, is the following DT
configuration valid?

sd_node {
    function = "sd";
    groups = "sd_grps";
};

gpio_node {
    function = "gpio";
    pins = "gpio_7", "gpio_8", "gpio_9", "gpio_10"; /* assuming 1:1
mapping between gpio and pin number to make this example simple */
};

Thanks,

Ray

Re: [PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Ray Jui]

On 1/22/2015 6:14 PM, Ray Jui wrote:
> 
> 
> On 1/13/2015 12:20 AM, Linus Walleij wrote:
>> On Fri, Jan 9, 2015 at 7:26 PM, Ray Jui <rjui@broadcom.com> wrote:
>>> On 1/9/2015 2:12 AM, Linus Walleij wrote:
>>
>>>> Just use "groups" and "function" and refer to
>>>> Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
>>>>
>>>> Then "alt1", "alt2" etc are non-functional names of functions.
>>>> Use the real function names, like "spi0" or so. This
>>>> alt-business seems to be just a shortcut to make it
>>>> simple, don't do that.
>>>>
>>>> Then you use e.g. "spi0" as a group name. I prefer you
>>>> call that "spi0_grp" or something to say it is a group of
>>>> pins associated with spi0, as spi0 is actually the
>>>> function.
>>>>
>>> Hmmm, I did this by following brcm,bcm11351-pinctrl.txt:
>>> - function: String. Specifies the pin mux selection. Values must be one
>>> of: "alt1", "alt2", "alt3", "alt4"
>>>
>>> But you are right, in the pinctrl binding document it describes the
>>> generic pin multiplexing nodes use "function" and "group".
>>
>> Note "function" and "groups". Note groups is pluralis. You can
>> select multiple groups for a single function.
>>
>>> For example, the group "lcd" covers 30 pins. When I configure "lcd" to
>>> alternate function 1, all 30 pins are muxed to LCD function. When
>>> configured to function 2, all pins are muxed to SRAM function. Now, here
>>> comes the issue, when configured to function 3, pins 1-15 and 20-30
>>> become GPIO function, but pins 16-19 becomes SPI5 function. When it's
>>> configured to function 4, all 30 pins become GPIO.
>>
>> I would split the use case in two groups for LCD and SRAM,
>> and three groups for GPIO:
>> "lcd_grp", "sram_grp", "gpio-1-15_grp",
>> "gpio-16-19_grp", "gpio-20-30_grp", "spi5_grp"
>>
>> Valid combinations become
>>
>> function = "lcd"
>> groups = "lcd_grp";
>>
>> function = "sram"
>> groups = "sram_grp"
>>
>> For all GPIO only this:
>>
>> function = "gpio"
>> groups = "gpio-1-16_grp", "gpio-16-19_grp", "gpio-20-30_grp"
>>
>> For a combined GPIO+SPI:
>>
>> function = "gpio"
>> groups = "gpio-1-16_grp", "gpio-20-30_grp"
>>
>> function = "spi5"
>> groups = "spi5_grp"
>>
>> The pinctrl runtile will protest if you try to combine spi5_grp
>> with gpio-16-19_grp.
>>
>>> In some other cases, when I configure a group to other functions, there
>>> could be spare pins which become unused (not brought out to the pad).
>>> Or, the spare pins may also become a separate function.
>>
>> That's cool.
>>
>>> Based on the LCD example, I'd assume I would do the following for the
>>> default LCD function:
>>>
>>> lcd_node {
>>>         group = "lcd_grp";
>>>         function = "lcd";
>>> };
>>>
>>> And in the case of function 3, I would call the function "spi5" and
>>> assume the rest of pins become either GPIO (or unused)?
>>>
>>> spi5_node {
>>>         group = "lcd_grp";
>>>         function = "spi5";
>>> };
>>
>> Looks cool per above.
>>
>> You need some clever code in the driver to handle double-configuration
>> of registers and so on, but I think it can be done.
>>
>> Using pin control as a GPIO backend can be a bit tricky and will need
>> some testing and elaboration, but the subsystem will block collisions.
>>
>> Yours,
>> Linus Walleij
>>
> 
> Hi Linus,
> 
> I have another question here. In the B0 revision of our Cygnus chip, the
> ASIC team added a feature to allow individual pins to be muxed to GPIO.
> The pinmux controller can still only do group-based muxing in general,
> but at the same time, you can override most (but not all) individual
> pins to GPIO.
> 
> I believe this HW design actually forces us to mix use "groups" and
> "pins" in DT.
> 
> For example, assuming we mux pins 1 - 10 as MMC (one cmd line, one clk
> line, and 8 data lines). One might make the decision that he only needs
> 4 data lines instead of 8 data lines, and he wants to free up the 4 data
> lines and uses as GPIO. Based on this example, is the following DT
> configuration valid?
> 
> sd_node {
>     function = "sd";
>     groups = "sd_grps";
> };
> 
> gpio_node {
>     function = "gpio";
>     pins = "gpio_7", "gpio_8", "gpio_9", "gpio_10"; /* assuming 1:1
> mapping between gpio and pin number to make this example simple */
> };
> 
> Thanks,
> 
> Ray
>

I dig into the pinctrl framework code a bit more and found that I can
use pinctrl_request_gpio from the GPIO driver and implement
gpio_request_enable in the pinctrl driver.

The only problem I see now is that these APIs seem to expect the use of
global GPIO numbers? And all pinctrl drivers I checked seem to be hard
coding the GPIO to pin mapping when declaring the struct
pinctrl_gpio_range array. How would this work in a system like ours that
have 3 GPIO controllers and was required to use a dynamic GPIO number
(i.e., we use gpio->base = -1, so it derives the base from
CONFIG_ARCH_NR_GPIO and goes backwards)?

I guess I can do some runtime calculation in my pinctrl driver to figure
out the GPIO->pin mapping based on CONFIG_ARCH_NR_GPIO, but this is
assuming that we always fix the order of the device nodes of the 3 GPIO
controllers.

I hope I'm not missing something here?

Thanks,

Ray

Re: [PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Ray Jui]

On 1/22/2015 6:14 PM, Ray Jui wrote:
> 
> 
> On 1/13/2015 12:20 AM, Linus Walleij wrote:
>> On Fri, Jan 9, 2015 at 7:26 PM, Ray Jui <rjui@broadcom.com> wrote:
>>> On 1/9/2015 2:12 AM, Linus Walleij wrote:
>>
>>>> Just use "groups" and "function" and refer to
>>>> Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
>>>>
>>>> Then "alt1", "alt2" etc are non-functional names of functions.
>>>> Use the real function names, like "spi0" or so. This
>>>> alt-business seems to be just a shortcut to make it
>>>> simple, don't do that.
>>>>
>>>> Then you use e.g. "spi0" as a group name. I prefer you
>>>> call that "spi0_grp" or something to say it is a group of
>>>> pins associated with spi0, as spi0 is actually the
>>>> function.
>>>>
>>> Hmmm, I did this by following brcm,bcm11351-pinctrl.txt:
>>> - function: String. Specifies the pin mux selection. Values must be one
>>> of: "alt1", "alt2", "alt3", "alt4"
>>>
>>> But you are right, in the pinctrl binding document it describes the
>>> generic pin multiplexing nodes use "function" and "group".
>>
>> Note "function" and "groups". Note groups is pluralis. You can
>> select multiple groups for a single function.
>>
>>> For example, the group "lcd" covers 30 pins. When I configure "lcd" to
>>> alternate function 1, all 30 pins are muxed to LCD function. When
>>> configured to function 2, all pins are muxed to SRAM function. Now, here
>>> comes the issue, when configured to function 3, pins 1-15 and 20-30
>>> become GPIO function, but pins 16-19 becomes SPI5 function. When it's
>>> configured to function 4, all 30 pins become GPIO.
>>
>> I would split the use case in two groups for LCD and SRAM,
>> and three groups for GPIO:
>> "lcd_grp", "sram_grp", "gpio-1-15_grp",
>> "gpio-16-19_grp", "gpio-20-30_grp", "spi5_grp"
>>
>> Valid combinations become
>>
>> function = "lcd"
>> groups = "lcd_grp";
>>
>> function = "sram"
>> groups = "sram_grp"
>>
>> For all GPIO only this:
>>
>> function = "gpio"
>> groups = "gpio-1-16_grp", "gpio-16-19_grp", "gpio-20-30_grp"
>>
>> For a combined GPIO+SPI:
>>
>> function = "gpio"
>> groups = "gpio-1-16_grp", "gpio-20-30_grp"
>>
>> function = "spi5"
>> groups = "spi5_grp"
>>
>> The pinctrl runtile will protest if you try to combine spi5_grp
>> with gpio-16-19_grp.
>>
>>> In some other cases, when I configure a group to other functions, there
>>> could be spare pins which become unused (not brought out to the pad).
>>> Or, the spare pins may also become a separate function.
>>
>> That's cool.
>>
>>> Based on the LCD example, I'd assume I would do the following for the
>>> default LCD function:
>>>
>>> lcd_node {
>>>         group = "lcd_grp";
>>>         function = "lcd";
>>> };
>>>
>>> And in the case of function 3, I would call the function "spi5" and
>>> assume the rest of pins become either GPIO (or unused)?
>>>
>>> spi5_node {
>>>         group = "lcd_grp";
>>>         function = "spi5";
>>> };
>>
>> Looks cool per above.
>>
>> You need some clever code in the driver to handle double-configuration
>> of registers and so on, but I think it can be done.
>>
>> Using pin control as a GPIO backend can be a bit tricky and will need
>> some testing and elaboration, but the subsystem will block collisions.
>>
>> Yours,
>> Linus Walleij
>>
> 
> Hi Linus,
> 
> I have another question here. In the B0 revision of our Cygnus chip, the
> ASIC team added a feature to allow individual pins to be muxed to GPIO.
> The pinmux controller can still only do group-based muxing in general,
> but at the same time, you can override most (but not all) individual
> pins to GPIO.
> 
> I believe this HW design actually forces us to mix use "groups" and
> "pins" in DT.
> 
> For example, assuming we mux pins 1 - 10 as MMC (one cmd line, one clk
> line, and 8 data lines). One might make the decision that he only needs
> 4 data lines instead of 8 data lines, and he wants to free up the 4 data
> lines and uses as GPIO. Based on this example, is the following DT
> configuration valid?
> 
> sd_node {
>     function = "sd";
>     groups = "sd_grps";
> };
> 
> gpio_node {
>     function = "gpio";
>     pins = "gpio_7", "gpio_8", "gpio_9", "gpio_10"; /* assuming 1:1
> mapping between gpio and pin number to make this example simple */
> };
> 
> Thanks,
> 
> Ray
>

I dig into the pinctrl framework code a bit more and found that I can
use pinctrl_request_gpio from the GPIO driver and implement
gpio_request_enable in the pinctrl driver.

The only problem I see now is that these APIs seem to expect the use of
global GPIO numbers? And all pinctrl drivers I checked seem to be hard
coding the GPIO to pin mapping when declaring the struct
pinctrl_gpio_range array. How would this work in a system like ours that
have 3 GPIO controllers and was required to use a dynamic GPIO number
(i.e., we use gpio->base = -1, so it derives the base from
CONFIG_ARCH_NR_GPIO and goes backwards)?

I guess I can do some runtime calculation in my pinctrl driver to figure
out the GPIO->pin mapping based on CONFIG_ARCH_NR_GPIO, but this is
assuming that we always fix the order of the device nodes of the 3 GPIO
controllers.

I hope I'm not missing something here?

Thanks,

Ray

[PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Ray Jui]

On 1/22/2015 6:14 PM, Ray Jui wrote:
> 
> 
> On 1/13/2015 12:20 AM, Linus Walleij wrote:
>> On Fri, Jan 9, 2015 at 7:26 PM, Ray Jui <rjui@broadcom.com> wrote:
>>> On 1/9/2015 2:12 AM, Linus Walleij wrote:
>>
>>>> Just use "groups" and "function" and refer to
>>>> Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
>>>>
>>>> Then "alt1", "alt2" etc are non-functional names of functions.
>>>> Use the real function names, like "spi0" or so. This
>>>> alt-business seems to be just a shortcut to make it
>>>> simple, don't do that.
>>>>
>>>> Then you use e.g. "spi0" as a group name. I prefer you
>>>> call that "spi0_grp" or something to say it is a group of
>>>> pins associated with spi0, as spi0 is actually the
>>>> function.
>>>>
>>> Hmmm, I did this by following brcm,bcm11351-pinctrl.txt:
>>> - function: String. Specifies the pin mux selection. Values must be one
>>> of: "alt1", "alt2", "alt3", "alt4"
>>>
>>> But you are right, in the pinctrl binding document it describes the
>>> generic pin multiplexing nodes use "function" and "group".
>>
>> Note "function" and "groups". Note groups is pluralis. You can
>> select multiple groups for a single function.
>>
>>> For example, the group "lcd" covers 30 pins. When I configure "lcd" to
>>> alternate function 1, all 30 pins are muxed to LCD function. When
>>> configured to function 2, all pins are muxed to SRAM function. Now, here
>>> comes the issue, when configured to function 3, pins 1-15 and 20-30
>>> become GPIO function, but pins 16-19 becomes SPI5 function. When it's
>>> configured to function 4, all 30 pins become GPIO.
>>
>> I would split the use case in two groups for LCD and SRAM,
>> and three groups for GPIO:
>> "lcd_grp", "sram_grp", "gpio-1-15_grp",
>> "gpio-16-19_grp", "gpio-20-30_grp", "spi5_grp"
>>
>> Valid combinations become
>>
>> function = "lcd"
>> groups = "lcd_grp";
>>
>> function = "sram"
>> groups = "sram_grp"
>>
>> For all GPIO only this:
>>
>> function = "gpio"
>> groups = "gpio-1-16_grp", "gpio-16-19_grp", "gpio-20-30_grp"
>>
>> For a combined GPIO+SPI:
>>
>> function = "gpio"
>> groups = "gpio-1-16_grp", "gpio-20-30_grp"
>>
>> function = "spi5"
>> groups = "spi5_grp"
>>
>> The pinctrl runtile will protest if you try to combine spi5_grp
>> with gpio-16-19_grp.
>>
>>> In some other cases, when I configure a group to other functions, there
>>> could be spare pins which become unused (not brought out to the pad).
>>> Or, the spare pins may also become a separate function.
>>
>> That's cool.
>>
>>> Based on the LCD example, I'd assume I would do the following for the
>>> default LCD function:
>>>
>>> lcd_node {
>>>         group = "lcd_grp";
>>>         function = "lcd";
>>> };
>>>
>>> And in the case of function 3, I would call the function "spi5" and
>>> assume the rest of pins become either GPIO (or unused)?
>>>
>>> spi5_node {
>>>         group = "lcd_grp";
>>>         function = "spi5";
>>> };
>>
>> Looks cool per above.
>>
>> You need some clever code in the driver to handle double-configuration
>> of registers and so on, but I think it can be done.
>>
>> Using pin control as a GPIO backend can be a bit tricky and will need
>> some testing and elaboration, but the subsystem will block collisions.
>>
>> Yours,
>> Linus Walleij
>>
> 
> Hi Linus,
> 
> I have another question here. In the B0 revision of our Cygnus chip, the
> ASIC team added a feature to allow individual pins to be muxed to GPIO.
> The pinmux controller can still only do group-based muxing in general,
> but at the same time, you can override most (but not all) individual
> pins to GPIO.
> 
> I believe this HW design actually forces us to mix use "groups" and
> "pins" in DT.
> 
> For example, assuming we mux pins 1 - 10 as MMC (one cmd line, one clk
> line, and 8 data lines). One might make the decision that he only needs
> 4 data lines instead of 8 data lines, and he wants to free up the 4 data
> lines and uses as GPIO. Based on this example, is the following DT
> configuration valid?
> 
> sd_node {
>     function = "sd";
>     groups = "sd_grps";
> };
> 
> gpio_node {
>     function = "gpio";
>     pins = "gpio_7", "gpio_8", "gpio_9", "gpio_10"; /* assuming 1:1
> mapping between gpio and pin number to make this example simple */
> };
> 
> Thanks,
> 
> Ray
>

I dig into the pinctrl framework code a bit more and found that I can
use pinctrl_request_gpio from the GPIO driver and implement
gpio_request_enable in the pinctrl driver.

The only problem I see now is that these APIs seem to expect the use of
global GPIO numbers? And all pinctrl drivers I checked seem to be hard
coding the GPIO to pin mapping when declaring the struct
pinctrl_gpio_range array. How would this work in a system like ours that
have 3 GPIO controllers and was required to use a dynamic GPIO number
(i.e., we use gpio->base = -1, so it derives the base from
CONFIG_ARCH_NR_GPIO and goes backwards)?

I guess I can do some runtime calculation in my pinctrl driver to figure
out the GPIO->pin mapping based on CONFIG_ARCH_NR_GPIO, but this is
assuming that we always fix the order of the device nodes of the 3 GPIO
controllers.

I hope I'm not missing something here?

Thanks,

Ray

Re: [PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Linus Walleij]

On Fri, Jan 23, 2015 at 3:14 AM, Ray Jui <rjui@broadcom.com> wrote:

> I have another question here. In the B0 revision of our Cygnus chip, the
> ASIC team added a feature to allow individual pins to be muxed to GPIO.
> The pinmux controller can still only do group-based muxing in general,
> but at the same time, you can override most (but not all) individual
> pins to GPIO.
>
> I believe this HW design actually forces us to mix use "groups" and
> "pins" in DT.
>
> For example, assuming we mux pins 1 - 10 as MMC (one cmd line, one clk
> line, and 8 data lines). One might make the decision that he only needs
> 4 data lines instead of 8 data lines, and he wants to free up the 4 data
> lines and uses as GPIO.

I would split the 8 available data lines in two groups,
like "data-1-4" and "data-5-8" since the use case is such
that either you use four or eight lines, not 6 or 7, either
just "data-1-4" or both "data-1-4" and "data-5-8".

> Based on this example, is the following DT
> configuration valid?

> sd_node {
>     function = "sd";
>     groups = "sd_grps";
> };
>
> gpio_node {
>     function = "gpio";
>     pins = "gpio_7", "gpio_8", "gpio_9", "gpio_10"; /* assuming 1:1
> mapping between gpio and pin number to make this example simple */
> };

Muxing an individual GPIO from the device tree is seldom a
good idea as you realized in your follow-up mail ;)

But this:

sd_node {
     function = "sd";
     groups = "data-1-4", "data-5-8", "other-pin-group";
};

Is perfectly fine. One function, several groups.

Yours,
Linus Walleij

Re: [PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Linus Walleij]

On Fri, Jan 23, 2015 at 3:14 AM, Ray Jui <rjui@broadcom.com> wrote:

> I have another question here. In the B0 revision of our Cygnus chip, the
> ASIC team added a feature to allow individual pins to be muxed to GPIO.
> The pinmux controller can still only do group-based muxing in general,
> but at the same time, you can override most (but not all) individual
> pins to GPIO.
>
> I believe this HW design actually forces us to mix use "groups" and
> "pins" in DT.
>
> For example, assuming we mux pins 1 - 10 as MMC (one cmd line, one clk
> line, and 8 data lines). One might make the decision that he only needs
> 4 data lines instead of 8 data lines, and he wants to free up the 4 data
> lines and uses as GPIO.

I would split the 8 available data lines in two groups,
like "data-1-4" and "data-5-8" since the use case is such
that either you use four or eight lines, not 6 or 7, either
just "data-1-4" or both "data-1-4" and "data-5-8".

> Based on this example, is the following DT
> configuration valid?

> sd_node {
>     function = "sd";
>     groups = "sd_grps";
> };
>
> gpio_node {
>     function = "gpio";
>     pins = "gpio_7", "gpio_8", "gpio_9", "gpio_10"; /* assuming 1:1
> mapping between gpio and pin number to make this example simple */
> };

Muxing an individual GPIO from the device tree is seldom a
good idea as you realized in your follow-up mail ;)

But this:

sd_node {
     function = "sd";
     groups = "data-1-4", "data-5-8", "other-pin-group";
};

Is perfectly fine. One function, several groups.

Yours,
Linus Walleij

[PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Linus Walleij]

On Fri, Jan 23, 2015 at 3:14 AM, Ray Jui <rjui@broadcom.com> wrote:

> I have another question here. In the B0 revision of our Cygnus chip, the
> ASIC team added a feature to allow individual pins to be muxed to GPIO.
> The pinmux controller can still only do group-based muxing in general,
> but at the same time, you can override most (but not all) individual
> pins to GPIO.
>
> I believe this HW design actually forces us to mix use "groups" and
> "pins" in DT.
>
> For example, assuming we mux pins 1 - 10 as MMC (one cmd line, one clk
> line, and 8 data lines). One might make the decision that he only needs
> 4 data lines instead of 8 data lines, and he wants to free up the 4 data
> lines and uses as GPIO.

I would split the 8 available data lines in two groups,
like "data-1-4" and "data-5-8" since the use case is such
that either you use four or eight lines, not 6 or 7, either
just "data-1-4" or both "data-1-4" and "data-5-8".

> Based on this example, is the following DT
> configuration valid?

> sd_node {
>     function = "sd";
>     groups = "sd_grps";
> };
>
> gpio_node {
>     function = "gpio";
>     pins = "gpio_7", "gpio_8", "gpio_9", "gpio_10"; /* assuming 1:1
> mapping between gpio and pin number to make this example simple */
> };

Muxing an individual GPIO from the device tree is seldom a
good idea as you realized in your follow-up mail ;)

But this:

sd_node {
     function = "sd";
     groups = "data-1-4", "data-5-8", "other-pin-group";
};

Is perfectly fine. One function, several groups.

Yours,
Linus Walleij

Re: [PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Linus Walleij]

On Fri, Jan 23, 2015 at 7:49 AM, Ray Jui <rjui@broadcom.com> wrote:

> I dig into the pinctrl framework code a bit more and found that I can
> use pinctrl_request_gpio from the GPIO driver and implement
> gpio_request_enable in the pinctrl driver.

Yep :) ain't it nice.

> The only problem I see now is that these APIs seem to expect the use of
> global GPIO numbers?

No they don't, only if you use the deprecated pinctrl_add_gpio_range().

Instead, when you register your struct gpio_chip, use
gpiochip_add_pin_range() and this will use relative offsets
without relying on global GPIO numbers.

This latter call replaces pinctrl_add_gpio_range().

> I hope I'm not missing something here?

You're missing gpiochip_add_pin_range() ;)

Yours,
Linus Walleij

Re: [PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Linus Walleij]

On Fri, Jan 23, 2015 at 7:49 AM, Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org> wrote:

> I dig into the pinctrl framework code a bit more and found that I can
> use pinctrl_request_gpio from the GPIO driver and implement
> gpio_request_enable in the pinctrl driver.

Yep :) ain't it nice.

> The only problem I see now is that these APIs seem to expect the use of
> global GPIO numbers?

No they don't, only if you use the deprecated pinctrl_add_gpio_range().

Instead, when you register your struct gpio_chip, use
gpiochip_add_pin_range() and this will use relative offsets
without relying on global GPIO numbers.

This latter call replaces pinctrl_add_gpio_range().

> I hope I'm not missing something here?

You're missing gpiochip_add_pin_range() ;)

Yours,
Linus Walleij
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[PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Linus Walleij]

On Fri, Jan 23, 2015 at 7:49 AM, Ray Jui <rjui@broadcom.com> wrote:

> I dig into the pinctrl framework code a bit more and found that I can
> use pinctrl_request_gpio from the GPIO driver and implement
> gpio_request_enable in the pinctrl driver.

Yep :) ain't it nice.

> The only problem I see now is that these APIs seem to expect the use of
> global GPIO numbers?

No they don't, only if you use the deprecated pinctrl_add_gpio_range().

Instead, when you register your struct gpio_chip, use
gpiochip_add_pin_range() and this will use relative offsets
without relying on global GPIO numbers.

This latter call replaces pinctrl_add_gpio_range().

> I hope I'm not missing something here?

You're missing gpiochip_add_pin_range() ;)

Yours,
Linus Walleij

Re: [PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Ray Jui]

On 1/30/2015 6:18 AM, Linus Walleij wrote:
> On Fri, Jan 23, 2015 at 7:49 AM, Ray Jui <rjui@broadcom.com> wrote:
> 
>> I dig into the pinctrl framework code a bit more and found that I can
>> use pinctrl_request_gpio from the GPIO driver and implement
>> gpio_request_enable in the pinctrl driver.
> 
> Yep :) ain't it nice.
> 
>> The only problem I see now is that these APIs seem to expect the use of
>> global GPIO numbers?
> 
> No they don't, only if you use the deprecated pinctrl_add_gpio_range().
> 
> Instead, when you register your struct gpio_chip, use
> gpiochip_add_pin_range() and this will use relative offsets
> without relying on global GPIO numbers.
> 
> This latter call replaces pinctrl_add_gpio_range().
> 
>> I hope I'm not missing something here?
> 
> You're missing gpiochip_add_pin_range() ;)
> 
> Yours,
> Linus Walleij
> 
Yeah, I realized this while implementing the driver, :)

I'm now in the final testing/cleaning phase of both Cygnus pinmux and
gpio/pinconf driver. I really appreciate that the pinctrl framework
allows the two to work seamlessly with each other and at the same time
provides the necessary interface to bridge the two, :)

I should be able to send out the patches of the two drivers for review
sometime next week.

Thanks for the help!

Ray

Re: [PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Ray Jui]

On 1/30/2015 6:18 AM, Linus Walleij wrote:
> On Fri, Jan 23, 2015 at 7:49 AM, Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org> wrote:
> 
>> I dig into the pinctrl framework code a bit more and found that I can
>> use pinctrl_request_gpio from the GPIO driver and implement
>> gpio_request_enable in the pinctrl driver.
> 
> Yep :) ain't it nice.
> 
>> The only problem I see now is that these APIs seem to expect the use of
>> global GPIO numbers?
> 
> No they don't, only if you use the deprecated pinctrl_add_gpio_range().
> 
> Instead, when you register your struct gpio_chip, use
> gpiochip_add_pin_range() and this will use relative offsets
> without relying on global GPIO numbers.
> 
> This latter call replaces pinctrl_add_gpio_range().
> 
>> I hope I'm not missing something here?
> 
> You're missing gpiochip_add_pin_range() ;)
> 
> Yours,
> Linus Walleij
> 
Yeah, I realized this while implementing the driver, :)

I'm now in the final testing/cleaning phase of both Cygnus pinmux and
gpio/pinconf driver. I really appreciate that the pinctrl framework
allows the two to work seamlessly with each other and at the same time
provides the necessary interface to bridge the two, :)

I should be able to send out the patches of the two drivers for review
sometime next week.

Thanks for the help!

Ray
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[PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Ray Jui]

On 1/30/2015 6:18 AM, Linus Walleij wrote:
> On Fri, Jan 23, 2015 at 7:49 AM, Ray Jui <rjui@broadcom.com> wrote:
> 
>> I dig into the pinctrl framework code a bit more and found that I can
>> use pinctrl_request_gpio from the GPIO driver and implement
>> gpio_request_enable in the pinctrl driver.
> 
> Yep :) ain't it nice.
> 
>> The only problem I see now is that these APIs seem to expect the use of
>> global GPIO numbers?
> 
> No they don't, only if you use the deprecated pinctrl_add_gpio_range().
> 
> Instead, when you register your struct gpio_chip, use
> gpiochip_add_pin_range() and this will use relative offsets
> without relying on global GPIO numbers.
> 
> This latter call replaces pinctrl_add_gpio_range().
> 
>> I hope I'm not missing something here?
> 
> You're missing gpiochip_add_pin_range() ;)
> 
> Yours,
> Linus Walleij
> 
Yeah, I realized this while implementing the driver, :)

I'm now in the final testing/cleaning phase of both Cygnus pinmux and
gpio/pinconf driver. I really appreciate that the pinctrl framework
allows the two to work seamlessly with each other and at the same time
provides the necessary interface to bridge the two, :)

I should be able to send out the patches of the two drivers for review
sometime next week.

Thanks for the help!

Ray

[PATCH v3 0/4] Add pinctrl support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial pinctrl (IOMUX) support for the Broadcom
Cygnus SoC. The Cygnus IOMUX controller supports group based mux configuration
and allows certain pins to be muxed to GPIO function individually

Changes from v2:
 - Consolidate all Broadcom pinctrl drivers into drivers/pinctrl/bcm/*
 - Change the Cygnus IOMUX driver to use standard Linux pinctrl subnode
properties such as "function" and "groups" for pinmux configuration, instead
of non-standard properties such as "brcm,function" and "brcm,group"
 - Use real function names like "spi0", "lcd", "key", and etc. instead of HW
specific mux names like "alt1", "alt2", "alt3", and etc.
 - Add suffix "grp" to all group names
 - Add support to allow individual pins to be muxed to GPIO function through
subsystem callbacks "gpio_request_enable" and "gpio_disable_free", and get rid
of all GPIO groups
 - Other minor improvements in the driver

Changes from v1:
 - Fix a typo in device tree binding document

Ray Jui (4):
  pinctrl: bcm: consolidate Broadcom pinctrl drivers
  pinctrl: Broadcom Cygnus pinctrl device tree binding
  pinctrl: cygnus: add initial IOMUX driver support
  ARM: dts: enable IOMUX for Broadcom Cygnus

 .../bindings/pinctrl/brcm,cygnus-pinmux.txt        |  159 +++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |    6 +
 drivers/pinctrl/Kconfig                            |   19 +-
 drivers/pinctrl/Makefile                           |    4 +-
 drivers/pinctrl/bcm/Kconfig                        |   34 +
 drivers/pinctrl/bcm/Makefile                       |    5 +
 drivers/pinctrl/bcm/pinctrl-bcm281xx.c             | 1455 ++++++++++++++++++++
 drivers/pinctrl/bcm/pinctrl-bcm2835.c              | 1072 ++++++++++++++
 drivers/pinctrl/bcm/pinctrl-cygnus-mux.c           | 1087 +++++++++++++++
 drivers/pinctrl/pinctrl-bcm281xx.c                 | 1455 --------------------
 drivers/pinctrl/pinctrl-bcm2835.c                  | 1072 --------------
 11 files changed, 3821 insertions(+), 2547 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinmux.txt
 create mode 100644 drivers/pinctrl/bcm/Kconfig
 create mode 100644 drivers/pinctrl/bcm/Makefile
 create mode 100644 drivers/pinctrl/bcm/pinctrl-bcm281xx.c
 create mode 100644 drivers/pinctrl/bcm/pinctrl-bcm2835.c
 create mode 100644 drivers/pinctrl/bcm/pinctrl-cygnus-mux.c
 delete mode 100644 drivers/pinctrl/pinctrl-bcm281xx.c
 delete mode 100644 drivers/pinctrl/pinctrl-bcm2835.c

-- 
1.7.9.5

[PATCH v3 0/4] Add pinctrl support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial pinctrl (IOMUX) support for the Broadcom
Cygnus SoC. The Cygnus IOMUX controller supports group based mux configuration
and allows certain pins to be muxed to GPIO function individually

Changes from v2:
 - Consolidate all Broadcom pinctrl drivers into drivers/pinctrl/bcm/*
 - Change the Cygnus IOMUX driver to use standard Linux pinctrl subnode
properties such as "function" and "groups" for pinmux configuration, instead
of non-standard properties such as "brcm,function" and "brcm,group"
 - Use real function names like "spi0", "lcd", "key", and etc. instead of HW
specific mux names like "alt1", "alt2", "alt3", and etc.
 - Add suffix "grp" to all group names
 - Add support to allow individual pins to be muxed to GPIO function through
subsystem callbacks "gpio_request_enable" and "gpio_disable_free", and get rid
of all GPIO groups
 - Other minor improvements in the driver

Changes from v1:
 - Fix a typo in device tree binding document

Ray Jui (4):
  pinctrl: bcm: consolidate Broadcom pinctrl drivers
  pinctrl: Broadcom Cygnus pinctrl device tree binding
  pinctrl: cygnus: add initial IOMUX driver support
  ARM: dts: enable IOMUX for Broadcom Cygnus

 .../bindings/pinctrl/brcm,cygnus-pinmux.txt        |  159 +++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |    6 +
 drivers/pinctrl/Kconfig                            |   19 +-
 drivers/pinctrl/Makefile                           |    4 +-
 drivers/pinctrl/bcm/Kconfig                        |   34 +
 drivers/pinctrl/bcm/Makefile                       |    5 +
 drivers/pinctrl/bcm/pinctrl-bcm281xx.c             | 1455 ++++++++++++++++++++
 drivers/pinctrl/bcm/pinctrl-bcm2835.c              | 1072 ++++++++++++++
 drivers/pinctrl/bcm/pinctrl-cygnus-mux.c           | 1087 +++++++++++++++
 drivers/pinctrl/pinctrl-bcm281xx.c                 | 1455 --------------------
 drivers/pinctrl/pinctrl-bcm2835.c                  | 1072 --------------
 11 files changed, 3821 insertions(+), 2547 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinmux.txt
 create mode 100644 drivers/pinctrl/bcm/Kconfig
 create mode 100644 drivers/pinctrl/bcm/Makefile
 create mode 100644 drivers/pinctrl/bcm/pinctrl-bcm281xx.c
 create mode 100644 drivers/pinctrl/bcm/pinctrl-bcm2835.c
 create mode 100644 drivers/pinctrl/bcm/pinctrl-cygnus-mux.c
 delete mode 100644 drivers/pinctrl/pinctrl-bcm281xx.c
 delete mode 100644 drivers/pinctrl/pinctrl-bcm2835.c

-- 
1.7.9.5

[PATCH v3 0/4] Add pinctrl support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial pinctrl (IOMUX) support for the Broadcom
Cygnus SoC. The Cygnus IOMUX controller supports group based mux configuration
and allows certain pins to be muxed to GPIO function individually

Changes from v2:
 - Consolidate all Broadcom pinctrl drivers into drivers/pinctrl/bcm/*
 - Change the Cygnus IOMUX driver to use standard Linux pinctrl subnode
properties such as "function" and "groups" for pinmux configuration, instead
of non-standard properties such as "brcm,function" and "brcm,group"
 - Use real function names like "spi0", "lcd", "key", and etc. instead of HW
specific mux names like "alt1", "alt2", "alt3", and etc.
 - Add suffix "grp" to all group names
 - Add support to allow individual pins to be muxed to GPIO function through
subsystem callbacks "gpio_request_enable" and "gpio_disable_free", and get rid
of all GPIO groups
 - Other minor improvements in the driver

Changes from v1:
 - Fix a typo in device tree binding document

Ray Jui (4):
  pinctrl: bcm: consolidate Broadcom pinctrl drivers
  pinctrl: Broadcom Cygnus pinctrl device tree binding
  pinctrl: cygnus: add initial IOMUX driver support
  ARM: dts: enable IOMUX for Broadcom Cygnus

 .../bindings/pinctrl/brcm,cygnus-pinmux.txt        |  159 +++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |    6 +
 drivers/pinctrl/Kconfig                            |   19 +-
 drivers/pinctrl/Makefile                           |    4 +-
 drivers/pinctrl/bcm/Kconfig                        |   34 +
 drivers/pinctrl/bcm/Makefile                       |    5 +
 drivers/pinctrl/bcm/pinctrl-bcm281xx.c             | 1455 ++++++++++++++++++++
 drivers/pinctrl/bcm/pinctrl-bcm2835.c              | 1072 ++++++++++++++
 drivers/pinctrl/bcm/pinctrl-cygnus-mux.c           | 1087 +++++++++++++++
 drivers/pinctrl/pinctrl-bcm281xx.c                 | 1455 --------------------
 drivers/pinctrl/pinctrl-bcm2835.c                  | 1072 --------------
 11 files changed, 3821 insertions(+), 2547 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinmux.txt
 create mode 100644 drivers/pinctrl/bcm/Kconfig
 create mode 100644 drivers/pinctrl/bcm/Makefile
 create mode 100644 drivers/pinctrl/bcm/pinctrl-bcm281xx.c
 create mode 100644 drivers/pinctrl/bcm/pinctrl-bcm2835.c
 create mode 100644 drivers/pinctrl/bcm/pinctrl-cygnus-mux.c
 delete mode 100644 drivers/pinctrl/pinctrl-bcm281xx.c
 delete mode 100644 drivers/pinctrl/pinctrl-bcm2835.c

-- 
1.7.9.5

[PATCH v3 1/4] pinctrl: bcm: consolidate Broadcom pinctrl drivers

[Ray Jui]

Consolidate Broadcom pinctrl drivers into drivers/pinctrl/bcm/*

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 drivers/pinctrl/Kconfig                |   19 +-
 drivers/pinctrl/Makefile               |    4 +-
 drivers/pinctrl/bcm/Kconfig            |   21 +
 drivers/pinctrl/bcm/Makefile           |    4 +
 drivers/pinctrl/bcm/pinctrl-bcm281xx.c | 1455 ++++++++++++++++++++++++++++++++
 drivers/pinctrl/bcm/pinctrl-bcm2835.c  | 1072 +++++++++++++++++++++++
 drivers/pinctrl/pinctrl-bcm281xx.c     | 1455 --------------------------------
 drivers/pinctrl/pinctrl-bcm2835.c      | 1072 -----------------------
 8 files changed, 2555 insertions(+), 2547 deletions(-)
 create mode 100644 drivers/pinctrl/bcm/Kconfig
 create mode 100644 drivers/pinctrl/bcm/Makefile
 create mode 100644 drivers/pinctrl/bcm/pinctrl-bcm281xx.c
 create mode 100644 drivers/pinctrl/bcm/pinctrl-bcm2835.c
 delete mode 100644 drivers/pinctrl/pinctrl-bcm281xx.c
 delete mode 100644 drivers/pinctrl/pinctrl-bcm2835.c

diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index d014f22..6cfdad7 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -67,24 +67,6 @@ config PINCTRL_AT91
 	help
 	  Say Y here to enable the at91 pinctrl driver
 
-config PINCTRL_BCM2835
-	bool
-	select PINMUX
-	select PINCONF
-
-config PINCTRL_BCM281XX
-	bool "Broadcom BCM281xx pinctrl driver"
-	depends on OF && (ARCH_BCM_MOBILE || COMPILE_TEST)
-	select PINMUX
-	select PINCONF
-	select GENERIC_PINCONF
-	select REGMAP_MMIO
-	help
-	  Say Y here to support Broadcom BCM281xx pinctrl driver, which is used
-	  for the BCM281xx SoC family, including BCM11130, BCM11140, BCM11351,
-	  BCM28145, and BCM28155 SoCs.  This driver requires the pinctrl
-	  framework.  GPIO is provided by a separate GPIO driver.
-
 config PINCTRL_LANTIQ
 	bool
 	depends on LANTIQ
@@ -191,6 +173,7 @@ config PINCTRL_PALMAS
 	  open drain configuration for the Palmas series devices like
 	  TPS65913, TPS80036 etc.
 
+source "drivers/pinctrl/bcm/Kconfig"
 source "drivers/pinctrl/berlin/Kconfig"
 source "drivers/pinctrl/freescale/Kconfig"
 source "drivers/pinctrl/intel/Kconfig"
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index c030b3d..c018bbf 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -14,8 +14,6 @@ obj-$(CONFIG_PINCTRL_AS3722)	+= pinctrl-as3722.o
 obj-$(CONFIG_PINCTRL_BF54x)	+= pinctrl-adi2-bf54x.o
 obj-$(CONFIG_PINCTRL_BF60x)	+= pinctrl-adi2-bf60x.o
 obj-$(CONFIG_PINCTRL_AT91)	+= pinctrl-at91.o
-obj-$(CONFIG_PINCTRL_BCM2835)	+= pinctrl-bcm2835.o
-obj-$(CONFIG_PINCTRL_BCM281XX)	+= pinctrl-bcm281xx.o
 obj-$(CONFIG_PINCTRL_FALCON)	+= pinctrl-falcon.o
 obj-$(CONFIG_PINCTRL_PALMAS)	+= pinctrl-palmas.o
 obj-$(CONFIG_PINCTRL_ROCKCHIP)	+= pinctrl-rockchip.o
@@ -36,6 +34,8 @@ obj-$(CONFIG_PINCTRL_LANTIQ)	+= pinctrl-lantiq.o
 obj-$(CONFIG_PINCTRL_TB10X)	+= pinctrl-tb10x.o
 obj-$(CONFIG_PINCTRL_ST) 	+= pinctrl-st.o
 
+obj-$(CONFIG_ARCH_BCM)		+= bcm/
+obj-$(CONFIG_ARCH_BCM2835)	+= bcm/
 obj-$(CONFIG_ARCH_BERLIN)	+= berlin/
 obj-y				+= freescale/
 obj-$(CONFIG_X86)		+= intel/
diff --git a/drivers/pinctrl/bcm/Kconfig b/drivers/pinctrl/bcm/Kconfig
new file mode 100644
index 0000000..bc6d048
--- /dev/null
+++ b/drivers/pinctrl/bcm/Kconfig
@@ -0,0 +1,21 @@
+#
+# Broadcom pinctrl drivers
+#
+
+config PINCTRL_BCM281XX
+	bool "Broadcom BCM281xx pinctrl driver"
+	depends on OF && (ARCH_BCM_MOBILE || COMPILE_TEST)
+	select PINMUX
+	select PINCONF
+	select GENERIC_PINCONF
+	select REGMAP_MMIO
+	help
+	  Say Y here to support Broadcom BCM281xx pinctrl driver, which is used
+	  for the BCM281xx SoC family, including BCM11130, BCM11140, BCM11351,
+	  BCM28145, and BCM28155 SoCs.  This driver requires the pinctrl
+	  framework.  GPIO is provided by a separate GPIO driver.
+
+config PINCTRL_BCM2835
+	bool
+	select PINMUX
+	select PINCONF
diff --git a/drivers/pinctrl/bcm/Makefile b/drivers/pinctrl/bcm/Makefile
new file mode 100644
index 0000000..7ba80a3
--- /dev/null
+++ b/drivers/pinctrl/bcm/Makefile
@@ -0,0 +1,4 @@
+# Broadcom pinctrl support
+
+obj-$(CONFIG_PINCTRL_BCM281XX)	+= pinctrl-bcm281xx.o
+obj-$(CONFIG_PINCTRL_BCM2835)	+= pinctrl-bcm2835.o
diff --git a/drivers/pinctrl/bcm/pinctrl-bcm281xx.c b/drivers/pinctrl/bcm/pinctrl-bcm281xx.c
new file mode 100644
index 0000000..73d99076
--- /dev/null
+++ b/drivers/pinctrl/bcm/pinctrl-bcm281xx.c
@@ -0,0 +1,1455 @@
+/*
+ * Copyright (C) 2013 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include "../core.h"
+#include "../pinctrl-utils.h"
+
+/* BCM281XX Pin Control Registers Definitions */
+
+/* Function Select bits are the same for all pin control registers */
+#define BCM281XX_PIN_REG_F_SEL_MASK		0x0700
+#define BCM281XX_PIN_REG_F_SEL_SHIFT		8
+
+/* Standard pin register */
+#define BCM281XX_STD_PIN_REG_DRV_STR_MASK	0x0007
+#define BCM281XX_STD_PIN_REG_DRV_STR_SHIFT	0
+#define BCM281XX_STD_PIN_REG_INPUT_DIS_MASK	0x0008
+#define BCM281XX_STD_PIN_REG_INPUT_DIS_SHIFT	3
+#define BCM281XX_STD_PIN_REG_SLEW_MASK		0x0010
+#define BCM281XX_STD_PIN_REG_SLEW_SHIFT		4
+#define BCM281XX_STD_PIN_REG_PULL_UP_MASK	0x0020
+#define BCM281XX_STD_PIN_REG_PULL_UP_SHIFT	5
+#define BCM281XX_STD_PIN_REG_PULL_DN_MASK	0x0040
+#define BCM281XX_STD_PIN_REG_PULL_DN_SHIFT	6
+#define BCM281XX_STD_PIN_REG_HYST_MASK		0x0080
+#define BCM281XX_STD_PIN_REG_HYST_SHIFT		7
+
+/* I2C pin register */
+#define BCM281XX_I2C_PIN_REG_INPUT_DIS_MASK	0x0004
+#define BCM281XX_I2C_PIN_REG_INPUT_DIS_SHIFT	2
+#define BCM281XX_I2C_PIN_REG_SLEW_MASK		0x0008
+#define BCM281XX_I2C_PIN_REG_SLEW_SHIFT		3
+#define BCM281XX_I2C_PIN_REG_PULL_UP_STR_MASK	0x0070
+#define BCM281XX_I2C_PIN_REG_PULL_UP_STR_SHIFT	4
+
+/* HDMI pin register */
+#define BCM281XX_HDMI_PIN_REG_INPUT_DIS_MASK	0x0008
+#define BCM281XX_HDMI_PIN_REG_INPUT_DIS_SHIFT	3
+#define BCM281XX_HDMI_PIN_REG_MODE_MASK		0x0010
+#define BCM281XX_HDMI_PIN_REG_MODE_SHIFT	4
+
+/**
+ * bcm281xx_pin_type - types of pin register
+ */
+enum bcm281xx_pin_type {
+	BCM281XX_PIN_TYPE_UNKNOWN = 0,
+	BCM281XX_PIN_TYPE_STD,
+	BCM281XX_PIN_TYPE_I2C,
+	BCM281XX_PIN_TYPE_HDMI,
+};
+
+static enum bcm281xx_pin_type std_pin = BCM281XX_PIN_TYPE_STD;
+static enum bcm281xx_pin_type i2c_pin = BCM281XX_PIN_TYPE_I2C;
+static enum bcm281xx_pin_type hdmi_pin = BCM281XX_PIN_TYPE_HDMI;
+
+/**
+ * bcm281xx_pin_function- define pin function
+ */
+struct bcm281xx_pin_function {
+	const char *name;
+	const char * const *groups;
+	const unsigned ngroups;
+};
+
+/**
+ * bcm281xx_pinctrl_data - Broadcom-specific pinctrl data
+ * @reg_base - base of pinctrl registers
+ */
+struct bcm281xx_pinctrl_data {
+	void __iomem *reg_base;
+
+	/* List of all pins */
+	const struct pinctrl_pin_desc *pins;
+	const unsigned npins;
+
+	const struct bcm281xx_pin_function *functions;
+	const unsigned nfunctions;
+
+	struct regmap *regmap;
+};
+
+/*
+ * Pin number definition.  The order here must be the same as defined in the
+ * PADCTRLREG block in the RDB.
+ */
+#define BCM281XX_PIN_ADCSYNC		0
+#define BCM281XX_PIN_BAT_RM		1
+#define BCM281XX_PIN_BSC1_SCL		2
+#define BCM281XX_PIN_BSC1_SDA		3
+#define BCM281XX_PIN_BSC2_SCL		4
+#define BCM281XX_PIN_BSC2_SDA		5
+#define BCM281XX_PIN_CLASSGPWR		6
+#define BCM281XX_PIN_CLK_CX8		7
+#define BCM281XX_PIN_CLKOUT_0		8
+#define BCM281XX_PIN_CLKOUT_1		9
+#define BCM281XX_PIN_CLKOUT_2		10
+#define BCM281XX_PIN_CLKOUT_3		11
+#define BCM281XX_PIN_CLKREQ_IN_0	12
+#define BCM281XX_PIN_CLKREQ_IN_1	13
+#define BCM281XX_PIN_CWS_SYS_REQ1	14
+#define BCM281XX_PIN_CWS_SYS_REQ2	15
+#define BCM281XX_PIN_CWS_SYS_REQ3	16
+#define BCM281XX_PIN_DIGMIC1_CLK	17
+#define BCM281XX_PIN_DIGMIC1_DQ		18
+#define BCM281XX_PIN_DIGMIC2_CLK	19
+#define BCM281XX_PIN_DIGMIC2_DQ		20
+#define BCM281XX_PIN_GPEN13		21
+#define BCM281XX_PIN_GPEN14		22
+#define BCM281XX_PIN_GPEN15		23
+#define BCM281XX_PIN_GPIO00		24
+#define BCM281XX_PIN_GPIO01		25
+#define BCM281XX_PIN_GPIO02		26
+#define BCM281XX_PIN_GPIO03		27
+#define BCM281XX_PIN_GPIO04		28
+#define BCM281XX_PIN_GPIO05		29
+#define BCM281XX_PIN_GPIO06		30
+#define BCM281XX_PIN_GPIO07		31
+#define BCM281XX_PIN_GPIO08		32
+#define BCM281XX_PIN_GPIO09		33
+#define BCM281XX_PIN_GPIO10		34
+#define BCM281XX_PIN_GPIO11		35
+#define BCM281XX_PIN_GPIO12		36
+#define BCM281XX_PIN_GPIO13		37
+#define BCM281XX_PIN_GPIO14		38
+#define BCM281XX_PIN_GPS_PABLANK	39
+#define BCM281XX_PIN_GPS_TMARK		40
+#define BCM281XX_PIN_HDMI_SCL		41
+#define BCM281XX_PIN_HDMI_SDA		42
+#define BCM281XX_PIN_IC_DM		43
+#define BCM281XX_PIN_IC_DP		44
+#define BCM281XX_PIN_KP_COL_IP_0	45
+#define BCM281XX_PIN_KP_COL_IP_1	46
+#define BCM281XX_PIN_KP_COL_IP_2	47
+#define BCM281XX_PIN_KP_COL_IP_3	48
+#define BCM281XX_PIN_KP_ROW_OP_0	49
+#define BCM281XX_PIN_KP_ROW_OP_1	50
+#define BCM281XX_PIN_KP_ROW_OP_2	51
+#define BCM281XX_PIN_KP_ROW_OP_3	52
+#define BCM281XX_PIN_LCD_B_0		53
+#define BCM281XX_PIN_LCD_B_1		54
+#define BCM281XX_PIN_LCD_B_2		55
+#define BCM281XX_PIN_LCD_B_3		56
+#define BCM281XX_PIN_LCD_B_4		57
+#define BCM281XX_PIN_LCD_B_5		58
+#define BCM281XX_PIN_LCD_B_6		59
+#define BCM281XX_PIN_LCD_B_7		60
+#define BCM281XX_PIN_LCD_G_0		61
+#define BCM281XX_PIN_LCD_G_1		62
+#define BCM281XX_PIN_LCD_G_2		63
+#define BCM281XX_PIN_LCD_G_3		64
+#define BCM281XX_PIN_LCD_G_4		65
+#define BCM281XX_PIN_LCD_G_5		66
+#define BCM281XX_PIN_LCD_G_6		67
+#define BCM281XX_PIN_LCD_G_7		68
+#define BCM281XX_PIN_LCD_HSYNC		69
+#define BCM281XX_PIN_LCD_OE		70
+#define BCM281XX_PIN_LCD_PCLK		71
+#define BCM281XX_PIN_LCD_R_0		72
+#define BCM281XX_PIN_LCD_R_1		73
+#define BCM281XX_PIN_LCD_R_2		74
+#define BCM281XX_PIN_LCD_R_3		75
+#define BCM281XX_PIN_LCD_R_4		76
+#define BCM281XX_PIN_LCD_R_5		77
+#define BCM281XX_PIN_LCD_R_6		78
+#define BCM281XX_PIN_LCD_R_7		79
+#define BCM281XX_PIN_LCD_VSYNC		80
+#define BCM281XX_PIN_MDMGPIO0		81
+#define BCM281XX_PIN_MDMGPIO1		82
+#define BCM281XX_PIN_MDMGPIO2		83
+#define BCM281XX_PIN_MDMGPIO3		84
+#define BCM281XX_PIN_MDMGPIO4		85
+#define BCM281XX_PIN_MDMGPIO5		86
+#define BCM281XX_PIN_MDMGPIO6		87
+#define BCM281XX_PIN_MDMGPIO7		88
+#define BCM281XX_PIN_MDMGPIO8		89
+#define BCM281XX_PIN_MPHI_DATA_0	90
+#define BCM281XX_PIN_MPHI_DATA_1	91
+#define BCM281XX_PIN_MPHI_DATA_2	92
+#define BCM281XX_PIN_MPHI_DATA_3	93
+#define BCM281XX_PIN_MPHI_DATA_4	94
+#define BCM281XX_PIN_MPHI_DATA_5	95
+#define BCM281XX_PIN_MPHI_DATA_6	96
+#define BCM281XX_PIN_MPHI_DATA_7	97
+#define BCM281XX_PIN_MPHI_DATA_8	98
+#define BCM281XX_PIN_MPHI_DATA_9	99
+#define BCM281XX_PIN_MPHI_DATA_10	100
+#define BCM281XX_PIN_MPHI_DATA_11	101
+#define BCM281XX_PIN_MPHI_DATA_12	102
+#define BCM281XX_PIN_MPHI_DATA_13	103
+#define BCM281XX_PIN_MPHI_DATA_14	104
+#define BCM281XX_PIN_MPHI_DATA_15	105
+#define BCM281XX_PIN_MPHI_HA0		106
+#define BCM281XX_PIN_MPHI_HAT0		107
+#define BCM281XX_PIN_MPHI_HAT1		108
+#define BCM281XX_PIN_MPHI_HCE0_N	109
+#define BCM281XX_PIN_MPHI_HCE1_N	110
+#define BCM281XX_PIN_MPHI_HRD_N		111
+#define BCM281XX_PIN_MPHI_HWR_N		112
+#define BCM281XX_PIN_MPHI_RUN0		113
+#define BCM281XX_PIN_MPHI_RUN1		114
+#define BCM281XX_PIN_MTX_SCAN_CLK	115
+#define BCM281XX_PIN_MTX_SCAN_DATA	116
+#define BCM281XX_PIN_NAND_AD_0		117
+#define BCM281XX_PIN_NAND_AD_1		118
+#define BCM281XX_PIN_NAND_AD_2		119
+#define BCM281XX_PIN_NAND_AD_3		120
+#define BCM281XX_PIN_NAND_AD_4		121
+#define BCM281XX_PIN_NAND_AD_5		122
+#define BCM281XX_PIN_NAND_AD_6		123
+#define BCM281XX_PIN_NAND_AD_7		124
+#define BCM281XX_PIN_NAND_ALE		125
+#define BCM281XX_PIN_NAND_CEN_0		126
+#define BCM281XX_PIN_NAND_CEN_1		127
+#define BCM281XX_PIN_NAND_CLE		128
+#define BCM281XX_PIN_NAND_OEN		129
+#define BCM281XX_PIN_NAND_RDY_0		130
+#define BCM281XX_PIN_NAND_RDY_1		131
+#define BCM281XX_PIN_NAND_WEN		132
+#define BCM281XX_PIN_NAND_WP		133
+#define BCM281XX_PIN_PC1		134
+#define BCM281XX_PIN_PC2		135
+#define BCM281XX_PIN_PMU_INT		136
+#define BCM281XX_PIN_PMU_SCL		137
+#define BCM281XX_PIN_PMU_SDA		138
+#define BCM281XX_PIN_RFST2G_MTSLOTEN3G	139
+#define BCM281XX_PIN_RGMII_0_RX_CTL	140
+#define BCM281XX_PIN_RGMII_0_RXC	141
+#define BCM281XX_PIN_RGMII_0_RXD_0	142
+#define BCM281XX_PIN_RGMII_0_RXD_1	143
+#define BCM281XX_PIN_RGMII_0_RXD_2	144
+#define BCM281XX_PIN_RGMII_0_RXD_3	145
+#define BCM281XX_PIN_RGMII_0_TX_CTL	146
+#define BCM281XX_PIN_RGMII_0_TXC	147
+#define BCM281XX_PIN_RGMII_0_TXD_0	148
+#define BCM281XX_PIN_RGMII_0_TXD_1	149
+#define BCM281XX_PIN_RGMII_0_TXD_2	150
+#define BCM281XX_PIN_RGMII_0_TXD_3	151
+#define BCM281XX_PIN_RGMII_1_RX_CTL	152
+#define BCM281XX_PIN_RGMII_1_RXC	153
+#define BCM281XX_PIN_RGMII_1_RXD_0	154
+#define BCM281XX_PIN_RGMII_1_RXD_1	155
+#define BCM281XX_PIN_RGMII_1_RXD_2	156
+#define BCM281XX_PIN_RGMII_1_RXD_3	157
+#define BCM281XX_PIN_RGMII_1_TX_CTL	158
+#define BCM281XX_PIN_RGMII_1_TXC	159
+#define BCM281XX_PIN_RGMII_1_TXD_0	160
+#define BCM281XX_PIN_RGMII_1_TXD_1	161
+#define BCM281XX_PIN_RGMII_1_TXD_2	162
+#define BCM281XX_PIN_RGMII_1_TXD_3	163
+#define BCM281XX_PIN_RGMII_GPIO_0	164
+#define BCM281XX_PIN_RGMII_GPIO_1	165
+#define BCM281XX_PIN_RGMII_GPIO_2	166
+#define BCM281XX_PIN_RGMII_GPIO_3	167
+#define BCM281XX_PIN_RTXDATA2G_TXDATA3G1	168
+#define BCM281XX_PIN_RTXEN2G_TXDATA3G2	169
+#define BCM281XX_PIN_RXDATA3G0		170
+#define BCM281XX_PIN_RXDATA3G1		171
+#define BCM281XX_PIN_RXDATA3G2		172
+#define BCM281XX_PIN_SDIO1_CLK		173
+#define BCM281XX_PIN_SDIO1_CMD		174
+#define BCM281XX_PIN_SDIO1_DATA_0	175
+#define BCM281XX_PIN_SDIO1_DATA_1	176
+#define BCM281XX_PIN_SDIO1_DATA_2	177
+#define BCM281XX_PIN_SDIO1_DATA_3	178
+#define BCM281XX_PIN_SDIO4_CLK		179
+#define BCM281XX_PIN_SDIO4_CMD		180
+#define BCM281XX_PIN_SDIO4_DATA_0	181
+#define BCM281XX_PIN_SDIO4_DATA_1	182
+#define BCM281XX_PIN_SDIO4_DATA_2	183
+#define BCM281XX_PIN_SDIO4_DATA_3	184
+#define BCM281XX_PIN_SIM_CLK		185
+#define BCM281XX_PIN_SIM_DATA		186
+#define BCM281XX_PIN_SIM_DET		187
+#define BCM281XX_PIN_SIM_RESETN		188
+#define BCM281XX_PIN_SIM2_CLK		189
+#define BCM281XX_PIN_SIM2_DATA		190
+#define BCM281XX_PIN_SIM2_DET		191
+#define BCM281XX_PIN_SIM2_RESETN	192
+#define BCM281XX_PIN_SRI_C		193
+#define BCM281XX_PIN_SRI_D		194
+#define BCM281XX_PIN_SRI_E		195
+#define BCM281XX_PIN_SSP_EXTCLK		196
+#define BCM281XX_PIN_SSP0_CLK		197
+#define BCM281XX_PIN_SSP0_FS		198
+#define BCM281XX_PIN_SSP0_RXD		199
+#define BCM281XX_PIN_SSP0_TXD		200
+#define BCM281XX_PIN_SSP2_CLK		201
+#define BCM281XX_PIN_SSP2_FS_0		202
+#define BCM281XX_PIN_SSP2_FS_1		203
+#define BCM281XX_PIN_SSP2_FS_2		204
+#define BCM281XX_PIN_SSP2_FS_3		205
+#define BCM281XX_PIN_SSP2_RXD_0		206
+#define BCM281XX_PIN_SSP2_RXD_1		207
+#define BCM281XX_PIN_SSP2_TXD_0		208
+#define BCM281XX_PIN_SSP2_TXD_1		209
+#define BCM281XX_PIN_SSP3_CLK		210
+#define BCM281XX_PIN_SSP3_FS		211
+#define BCM281XX_PIN_SSP3_RXD		212
+#define BCM281XX_PIN_SSP3_TXD		213
+#define BCM281XX_PIN_SSP4_CLK		214
+#define BCM281XX_PIN_SSP4_FS		215
+#define BCM281XX_PIN_SSP4_RXD		216
+#define BCM281XX_PIN_SSP4_TXD		217
+#define BCM281XX_PIN_SSP5_CLK		218
+#define BCM281XX_PIN_SSP5_FS		219
+#define BCM281XX_PIN_SSP5_RXD		220
+#define BCM281XX_PIN_SSP5_TXD		221
+#define BCM281XX_PIN_SSP6_CLK		222
+#define BCM281XX_PIN_SSP6_FS		223
+#define BCM281XX_PIN_SSP6_RXD		224
+#define BCM281XX_PIN_SSP6_TXD		225
+#define BCM281XX_PIN_STAT_1		226
+#define BCM281XX_PIN_STAT_2		227
+#define BCM281XX_PIN_SYSCLKEN		228
+#define BCM281XX_PIN_TRACECLK		229
+#define BCM281XX_PIN_TRACEDT00		230
+#define BCM281XX_PIN_TRACEDT01		231
+#define BCM281XX_PIN_TRACEDT02		232
+#define BCM281XX_PIN_TRACEDT03		233
+#define BCM281XX_PIN_TRACEDT04		234
+#define BCM281XX_PIN_TRACEDT05		235
+#define BCM281XX_PIN_TRACEDT06		236
+#define BCM281XX_PIN_TRACEDT07		237
+#define BCM281XX_PIN_TRACEDT08		238
+#define BCM281XX_PIN_TRACEDT09		239
+#define BCM281XX_PIN_TRACEDT10		240
+#define BCM281XX_PIN_TRACEDT11		241
+#define BCM281XX_PIN_TRACEDT12		242
+#define BCM281XX_PIN_TRACEDT13		243
+#define BCM281XX_PIN_TRACEDT14		244
+#define BCM281XX_PIN_TRACEDT15		245
+#define BCM281XX_PIN_TXDATA3G0		246
+#define BCM281XX_PIN_TXPWRIND		247
+#define BCM281XX_PIN_UARTB1_UCTS	248
+#define BCM281XX_PIN_UARTB1_URTS	249
+#define BCM281XX_PIN_UARTB1_URXD	250
+#define BCM281XX_PIN_UARTB1_UTXD	251
+#define BCM281XX_PIN_UARTB2_URXD	252
+#define BCM281XX_PIN_UARTB2_UTXD	253
+#define BCM281XX_PIN_UARTB3_UCTS	254
+#define BCM281XX_PIN_UARTB3_URTS	255
+#define BCM281XX_PIN_UARTB3_URXD	256
+#define BCM281XX_PIN_UARTB3_UTXD	257
+#define BCM281XX_PIN_UARTB4_UCTS	258
+#define BCM281XX_PIN_UARTB4_URTS	259
+#define BCM281XX_PIN_UARTB4_URXD	260
+#define BCM281XX_PIN_UARTB4_UTXD	261
+#define BCM281XX_PIN_VC_CAM1_SCL	262
+#define BCM281XX_PIN_VC_CAM1_SDA	263
+#define BCM281XX_PIN_VC_CAM2_SCL	264
+#define BCM281XX_PIN_VC_CAM2_SDA	265
+#define BCM281XX_PIN_VC_CAM3_SCL	266
+#define BCM281XX_PIN_VC_CAM3_SDA	267
+
+#define BCM281XX_PIN_DESC(a, b, c) \
+	{ .number = a, .name = b, .drv_data = &c##_pin }
+
+/*
+ * Pin description definition.  The order here must be the same as defined in
+ * the PADCTRLREG block in the RDB, since the pin number is used as an index
+ * into this array.
+ */
+static const struct pinctrl_pin_desc bcm281xx_pinctrl_pins[] = {
+	BCM281XX_PIN_DESC(BCM281XX_PIN_ADCSYNC, "adcsync", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_BAT_RM, "bat_rm", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_BSC1_SCL, "bsc1_scl", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_BSC1_SDA, "bsc1_sda", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_BSC2_SCL, "bsc2_scl", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_BSC2_SDA, "bsc2_sda", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CLASSGPWR, "classgpwr", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CLK_CX8, "clk_cx8", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKOUT_0, "clkout_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKOUT_1, "clkout_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKOUT_2, "clkout_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKOUT_3, "clkout_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKREQ_IN_0, "clkreq_in_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKREQ_IN_1, "clkreq_in_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CWS_SYS_REQ1, "cws_sys_req1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CWS_SYS_REQ2, "cws_sys_req2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CWS_SYS_REQ3, "cws_sys_req3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_DIGMIC1_CLK, "digmic1_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_DIGMIC1_DQ, "digmic1_dq", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_DIGMIC2_CLK, "digmic2_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_DIGMIC2_DQ, "digmic2_dq", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPEN13, "gpen13", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPEN14, "gpen14", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPEN15, "gpen15", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO00, "gpio00", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO01, "gpio01", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO02, "gpio02", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO03, "gpio03", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO04, "gpio04", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO05, "gpio05", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO06, "gpio06", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO07, "gpio07", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO08, "gpio08", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO09, "gpio09", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO10, "gpio10", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO11, "gpio11", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO12, "gpio12", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO13, "gpio13", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO14, "gpio14", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPS_PABLANK, "gps_pablank", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPS_TMARK, "gps_tmark", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_HDMI_SCL, "hdmi_scl", hdmi),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_HDMI_SDA, "hdmi_sda", hdmi),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_IC_DM, "ic_dm", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_IC_DP, "ic_dp", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_COL_IP_0, "kp_col_ip_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_COL_IP_1, "kp_col_ip_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_COL_IP_2, "kp_col_ip_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_COL_IP_3, "kp_col_ip_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_ROW_OP_0, "kp_row_op_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_ROW_OP_1, "kp_row_op_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_ROW_OP_2, "kp_row_op_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_ROW_OP_3, "kp_row_op_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_0, "lcd_b_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_1, "lcd_b_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_2, "lcd_b_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_3, "lcd_b_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_4, "lcd_b_4", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_5, "lcd_b_5", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_6, "lcd_b_6", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_7, "lcd_b_7", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_0, "lcd_g_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_1, "lcd_g_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_2, "lcd_g_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_3, "lcd_g_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_4, "lcd_g_4", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_5, "lcd_g_5", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_6, "lcd_g_6", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_7, "lcd_g_7", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_HSYNC, "lcd_hsync", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_OE, "lcd_oe", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_PCLK, "lcd_pclk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_0, "lcd_r_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_1, "lcd_r_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_2, "lcd_r_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_3, "lcd_r_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_4, "lcd_r_4", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_5, "lcd_r_5", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_6, "lcd_r_6", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_7, "lcd_r_7", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_VSYNC, "lcd_vsync", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO0, "mdmgpio0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO1, "mdmgpio1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO2, "mdmgpio2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO3, "mdmgpio3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO4, "mdmgpio4", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO5, "mdmgpio5", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO6, "mdmgpio6", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO7, "mdmgpio7", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO8, "mdmgpio8", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_0, "mphi_data_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_1, "mphi_data_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_2, "mphi_data_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_3, "mphi_data_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_4, "mphi_data_4", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_5, "mphi_data_5", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_6, "mphi_data_6", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_7, "mphi_data_7", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_8, "mphi_data_8", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_9, "mphi_data_9", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_10, "mphi_data_10", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_11, "mphi_data_11", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_12, "mphi_data_12", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_13, "mphi_data_13", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_14, "mphi_data_14", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_15, "mphi_data_15", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HA0, "mphi_ha0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HAT0, "mphi_hat0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HAT1, "mphi_hat1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HCE0_N, "mphi_hce0_n", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HCE1_N, "mphi_hce1_n", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HRD_N, "mphi_hrd_n", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HWR_N, "mphi_hwr_n", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_RUN0, "mphi_run0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_RUN1, "mphi_run1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MTX_SCAN_CLK, "mtx_scan_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MTX_SCAN_DATA, "mtx_scan_data", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_0, "nand_ad_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_1, "nand_ad_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_2, "nand_ad_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_3, "nand_ad_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_4, "nand_ad_4", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_5, "nand_ad_5", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_6, "nand_ad_6", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_7, "nand_ad_7", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_ALE, "nand_ale", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_CEN_0, "nand_cen_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_CEN_1, "nand_cen_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_CLE, "nand_cle", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_OEN, "nand_oen", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_RDY_0, "nand_rdy_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_RDY_1, "nand_rdy_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_WEN, "nand_wen", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_WP, "nand_wp", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_PC1, "pc1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_PC2, "pc2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_PMU_INT, "pmu_int", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_PMU_SCL, "pmu_scl", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_PMU_SDA, "pmu_sda", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RFST2G_MTSLOTEN3G, "rfst2g_mtsloten3g",
+		std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RX_CTL, "rgmii_0_rx_ctl", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXC, "rgmii_0_rxc", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXD_0, "rgmii_0_rxd_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXD_1, "rgmii_0_rxd_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXD_2, "rgmii_0_rxd_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXD_3, "rgmii_0_rxd_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TX_CTL, "rgmii_0_tx_ctl", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXC, "rgmii_0_txc", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXD_0, "rgmii_0_txd_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXD_1, "rgmii_0_txd_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXD_2, "rgmii_0_txd_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXD_3, "rgmii_0_txd_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RX_CTL, "rgmii_1_rx_ctl", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXC, "rgmii_1_rxc", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXD_0, "rgmii_1_rxd_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXD_1, "rgmii_1_rxd_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXD_2, "rgmii_1_rxd_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXD_3, "rgmii_1_rxd_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TX_CTL, "rgmii_1_tx_ctl", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXC, "rgmii_1_txc", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXD_0, "rgmii_1_txd_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXD_1, "rgmii_1_txd_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXD_2, "rgmii_1_txd_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXD_3, "rgmii_1_txd_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_GPIO_0, "rgmii_gpio_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_GPIO_1, "rgmii_gpio_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_GPIO_2, "rgmii_gpio_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_GPIO_3, "rgmii_gpio_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RTXDATA2G_TXDATA3G1,
+		"rtxdata2g_txdata3g1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RTXEN2G_TXDATA3G2, "rtxen2g_txdata3g2",
+		std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RXDATA3G0, "rxdata3g0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RXDATA3G1, "rxdata3g1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RXDATA3G2, "rxdata3g2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_CLK, "sdio1_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_CMD, "sdio1_cmd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_DATA_0, "sdio1_data_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_DATA_1, "sdio1_data_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_DATA_2, "sdio1_data_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_DATA_3, "sdio1_data_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_CLK, "sdio4_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_CMD, "sdio4_cmd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_DATA_0, "sdio4_data_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_DATA_1, "sdio4_data_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_DATA_2, "sdio4_data_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_DATA_3, "sdio4_data_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM_CLK, "sim_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM_DATA, "sim_data", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM_DET, "sim_det", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM_RESETN, "sim_resetn", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM2_CLK, "sim2_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM2_DATA, "sim2_data", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM2_DET, "sim2_det", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM2_RESETN, "sim2_resetn", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SRI_C, "sri_c", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SRI_D, "sri_d", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SRI_E, "sri_e", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP_EXTCLK, "ssp_extclk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP0_CLK, "ssp0_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP0_FS, "ssp0_fs", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP0_RXD, "ssp0_rxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP0_TXD, "ssp0_txd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_CLK, "ssp2_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_FS_0, "ssp2_fs_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_FS_1, "ssp2_fs_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_FS_2, "ssp2_fs_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_FS_3, "ssp2_fs_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_RXD_0, "ssp2_rxd_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_RXD_1, "ssp2_rxd_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_TXD_0, "ssp2_txd_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_TXD_1, "ssp2_txd_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP3_CLK, "ssp3_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP3_FS, "ssp3_fs", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP3_RXD, "ssp3_rxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP3_TXD, "ssp3_txd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP4_CLK, "ssp4_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP4_FS, "ssp4_fs", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP4_RXD, "ssp4_rxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP4_TXD, "ssp4_txd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP5_CLK, "ssp5_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP5_FS, "ssp5_fs", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP5_RXD, "ssp5_rxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP5_TXD, "ssp5_txd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP6_CLK, "ssp6_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP6_FS, "ssp6_fs", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP6_RXD, "ssp6_rxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP6_TXD, "ssp6_txd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_STAT_1, "stat_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_STAT_2, "stat_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SYSCLKEN, "sysclken", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACECLK, "traceclk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT00, "tracedt00", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT01, "tracedt01", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT02, "tracedt02", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT03, "tracedt03", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT04, "tracedt04", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT05, "tracedt05", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT06, "tracedt06", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT07, "tracedt07", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT08, "tracedt08", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT09, "tracedt09", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT10, "tracedt10", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT11, "tracedt11", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT12, "tracedt12", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT13, "tracedt13", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT14, "tracedt14", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT15, "tracedt15", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TXDATA3G0, "txdata3g0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TXPWRIND, "txpwrind", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB1_UCTS, "uartb1_ucts", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB1_URTS, "uartb1_urts", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB1_URXD, "uartb1_urxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB1_UTXD, "uartb1_utxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB2_URXD, "uartb2_urxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB2_UTXD, "uartb2_utxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB3_UCTS, "uartb3_ucts", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB3_URTS, "uartb3_urts", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB3_URXD, "uartb3_urxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB3_UTXD, "uartb3_utxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB4_UCTS, "uartb4_ucts", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB4_URTS, "uartb4_urts", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB4_URXD, "uartb4_urxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB4_UTXD, "uartb4_utxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM1_SCL, "vc_cam1_scl", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM1_SDA, "vc_cam1_sda", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM2_SCL, "vc_cam2_scl", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM2_SDA, "vc_cam2_sda", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM3_SCL, "vc_cam3_scl", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM3_SDA, "vc_cam3_sda", i2c),
+};
+
+static const char * const bcm281xx_alt_groups[] = {
+	"adcsync",
+	"bat_rm",
+	"bsc1_scl",
+	"bsc1_sda",
+	"bsc2_scl",
+	"bsc2_sda",
+	"classgpwr",
+	"clk_cx8",
+	"clkout_0",
+	"clkout_1",
+	"clkout_2",
+	"clkout_3",
+	"clkreq_in_0",
+	"clkreq_in_1",
+	"cws_sys_req1",
+	"cws_sys_req2",
+	"cws_sys_req3",
+	"digmic1_clk",
+	"digmic1_dq",
+	"digmic2_clk",
+	"digmic2_dq",
+	"gpen13",
+	"gpen14",
+	"gpen15",
+	"gpio00",
+	"gpio01",
+	"gpio02",
+	"gpio03",
+	"gpio04",
+	"gpio05",
+	"gpio06",
+	"gpio07",
+	"gpio08",
+	"gpio09",
+	"gpio10",
+	"gpio11",
+	"gpio12",
+	"gpio13",
+	"gpio14",
+	"gps_pablank",
+	"gps_tmark",
+	"hdmi_scl",
+	"hdmi_sda",
+	"ic_dm",
+	"ic_dp",
+	"kp_col_ip_0",
+	"kp_col_ip_1",
+	"kp_col_ip_2",
+	"kp_col_ip_3",
+	"kp_row_op_0",
+	"kp_row_op_1",
+	"kp_row_op_2",
+	"kp_row_op_3",
+	"lcd_b_0",
+	"lcd_b_1",
+	"lcd_b_2",
+	"lcd_b_3",
+	"lcd_b_4",
+	"lcd_b_5",
+	"lcd_b_6",
+	"lcd_b_7",
+	"lcd_g_0",
+	"lcd_g_1",
+	"lcd_g_2",
+	"lcd_g_3",
+	"lcd_g_4",
+	"lcd_g_5",
+	"lcd_g_6",
+	"lcd_g_7",
+	"lcd_hsync",
+	"lcd_oe",
+	"lcd_pclk",
+	"lcd_r_0",
+	"lcd_r_1",
+	"lcd_r_2",
+	"lcd_r_3",
+	"lcd_r_4",
+	"lcd_r_5",
+	"lcd_r_6",
+	"lcd_r_7",
+	"lcd_vsync",
+	"mdmgpio0",
+	"mdmgpio1",
+	"mdmgpio2",
+	"mdmgpio3",
+	"mdmgpio4",
+	"mdmgpio5",
+	"mdmgpio6",
+	"mdmgpio7",
+	"mdmgpio8",
+	"mphi_data_0",
+	"mphi_data_1",
+	"mphi_data_2",
+	"mphi_data_3",
+	"mphi_data_4",
+	"mphi_data_5",
+	"mphi_data_6",
+	"mphi_data_7",
+	"mphi_data_8",
+	"mphi_data_9",
+	"mphi_data_10",
+	"mphi_data_11",
+	"mphi_data_12",
+	"mphi_data_13",
+	"mphi_data_14",
+	"mphi_data_15",
+	"mphi_ha0",
+	"mphi_hat0",
+	"mphi_hat1",
+	"mphi_hce0_n",
+	"mphi_hce1_n",
+	"mphi_hrd_n",
+	"mphi_hwr_n",
+	"mphi_run0",
+	"mphi_run1",
+	"mtx_scan_clk",
+	"mtx_scan_data",
+	"nand_ad_0",
+	"nand_ad_1",
+	"nand_ad_2",
+	"nand_ad_3",
+	"nand_ad_4",
+	"nand_ad_5",
+	"nand_ad_6",
+	"nand_ad_7",
+	"nand_ale",
+	"nand_cen_0",
+	"nand_cen_1",
+	"nand_cle",
+	"nand_oen",
+	"nand_rdy_0",
+	"nand_rdy_1",
+	"nand_wen",
+	"nand_wp",
+	"pc1",
+	"pc2",
+	"pmu_int",
+	"pmu_scl",
+	"pmu_sda",
+	"rfst2g_mtsloten3g",
+	"rgmii_0_rx_ctl",
+	"rgmii_0_rxc",
+	"rgmii_0_rxd_0",
+	"rgmii_0_rxd_1",
+	"rgmii_0_rxd_2",
+	"rgmii_0_rxd_3",
+	"rgmii_0_tx_ctl",
+	"rgmii_0_txc",
+	"rgmii_0_txd_0",
+	"rgmii_0_txd_1",
+	"rgmii_0_txd_2",
+	"rgmii_0_txd_3",
+	"rgmii_1_rx_ctl",
+	"rgmii_1_rxc",
+	"rgmii_1_rxd_0",
+	"rgmii_1_rxd_1",
+	"rgmii_1_rxd_2",
+	"rgmii_1_rxd_3",
+	"rgmii_1_tx_ctl",
+	"rgmii_1_txc",
+	"rgmii_1_txd_0",
+	"rgmii_1_txd_1",
+	"rgmii_1_txd_2",
+	"rgmii_1_txd_3",
+	"rgmii_gpio_0",
+	"rgmii_gpio_1",
+	"rgmii_gpio_2",
+	"rgmii_gpio_3",
+	"rtxdata2g_txdata3g1",
+	"rtxen2g_txdata3g2",
+	"rxdata3g0",
+	"rxdata3g1",
+	"rxdata3g2",
+	"sdio1_clk",
+	"sdio1_cmd",
+	"sdio1_data_0",
+	"sdio1_data_1",
+	"sdio1_data_2",
+	"sdio1_data_3",
+	"sdio4_clk",
+	"sdio4_cmd",
+	"sdio4_data_0",
+	"sdio4_data_1",
+	"sdio4_data_2",
+	"sdio4_data_3",
+	"sim_clk",
+	"sim_data",
+	"sim_det",
+	"sim_resetn",
+	"sim2_clk",
+	"sim2_data",
+	"sim2_det",
+	"sim2_resetn",
+	"sri_c",
+	"sri_d",
+	"sri_e",
+	"ssp_extclk",
+	"ssp0_clk",
+	"ssp0_fs",
+	"ssp0_rxd",
+	"ssp0_txd",
+	"ssp2_clk",
+	"ssp2_fs_0",
+	"ssp2_fs_1",
+	"ssp2_fs_2",
+	"ssp2_fs_3",
+	"ssp2_rxd_0",
+	"ssp2_rxd_1",
+	"ssp2_txd_0",
+	"ssp2_txd_1",
+	"ssp3_clk",
+	"ssp3_fs",
+	"ssp3_rxd",
+	"ssp3_txd",
+	"ssp4_clk",
+	"ssp4_fs",
+	"ssp4_rxd",
+	"ssp4_txd",
+	"ssp5_clk",
+	"ssp5_fs",
+	"ssp5_rxd",
+	"ssp5_txd",
+	"ssp6_clk",
+	"ssp6_fs",
+	"ssp6_rxd",
+	"ssp6_txd",
+	"stat_1",
+	"stat_2",
+	"sysclken",
+	"traceclk",
+	"tracedt00",
+	"tracedt01",
+	"tracedt02",
+	"tracedt03",
+	"tracedt04",
+	"tracedt05",
+	"tracedt06",
+	"tracedt07",
+	"tracedt08",
+	"tracedt09",
+	"tracedt10",
+	"tracedt11",
+	"tracedt12",
+	"tracedt13",
+	"tracedt14",
+	"tracedt15",
+	"txdata3g0",
+	"txpwrind",
+	"uartb1_ucts",
+	"uartb1_urts",
+	"uartb1_urxd",
+	"uartb1_utxd",
+	"uartb2_urxd",
+	"uartb2_utxd",
+	"uartb3_ucts",
+	"uartb3_urts",
+	"uartb3_urxd",
+	"uartb3_utxd",
+	"uartb4_ucts",
+	"uartb4_urts",
+	"uartb4_urxd",
+	"uartb4_utxd",
+	"vc_cam1_scl",
+	"vc_cam1_sda",
+	"vc_cam2_scl",
+	"vc_cam2_sda",
+	"vc_cam3_scl",
+	"vc_cam3_sda",
+};
+
+/* Every pin can implement all ALT1-ALT4 functions */
+#define BCM281XX_PIN_FUNCTION(fcn_name)			\
+{							\
+	.name = #fcn_name,				\
+	.groups = bcm281xx_alt_groups,			\
+	.ngroups = ARRAY_SIZE(bcm281xx_alt_groups),	\
+}
+
+static const struct bcm281xx_pin_function bcm281xx_functions[] = {
+	BCM281XX_PIN_FUNCTION(alt1),
+	BCM281XX_PIN_FUNCTION(alt2),
+	BCM281XX_PIN_FUNCTION(alt3),
+	BCM281XX_PIN_FUNCTION(alt4),
+};
+
+static struct bcm281xx_pinctrl_data bcm281xx_pinctrl = {
+	.pins = bcm281xx_pinctrl_pins,
+	.npins = ARRAY_SIZE(bcm281xx_pinctrl_pins),
+	.functions = bcm281xx_functions,
+	.nfunctions = ARRAY_SIZE(bcm281xx_functions),
+};
+
+static inline enum bcm281xx_pin_type pin_type_get(struct pinctrl_dev *pctldev,
+						  unsigned pin)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+
+	if (pin >= pdata->npins)
+		return BCM281XX_PIN_TYPE_UNKNOWN;
+
+	return *(enum bcm281xx_pin_type *)(pdata->pins[pin].drv_data);
+}
+
+#define BCM281XX_PIN_SHIFT(type, param) \
+	(BCM281XX_ ## type ## _PIN_REG_ ## param ## _SHIFT)
+
+#define BCM281XX_PIN_MASK(type, param) \
+	(BCM281XX_ ## type ## _PIN_REG_ ## param ## _MASK)
+
+/*
+ * This helper function is used to build up the value and mask used to write to
+ * a pin register, but does not actually write to the register.
+ */
+static inline void bcm281xx_pin_update(u32 *reg_val, u32 *reg_mask,
+				       u32 param_val, u32 param_shift,
+				       u32 param_mask)
+{
+	*reg_val &= ~param_mask;
+	*reg_val |= (param_val << param_shift) & param_mask;
+	*reg_mask |= param_mask;
+}
+
+static struct regmap_config bcm281xx_pinctrl_regmap_config = {
+	.reg_bits = 32,
+	.reg_stride = 4,
+	.val_bits = 32,
+	.max_register = BCM281XX_PIN_VC_CAM3_SDA,
+};
+
+static int bcm281xx_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+
+	return pdata->npins;
+}
+
+static const char *bcm281xx_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
+						   unsigned group)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+
+	return pdata->pins[group].name;
+}
+
+static int bcm281xx_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
+					   unsigned group,
+					   const unsigned **pins,
+					   unsigned *num_pins)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+
+	*pins = &pdata->pins[group].number;
+	*num_pins = 1;
+
+	return 0;
+}
+
+static void bcm281xx_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
+					  struct seq_file *s,
+					  unsigned offset)
+{
+	seq_printf(s, " %s", dev_name(pctldev->dev));
+}
+
+static struct pinctrl_ops bcm281xx_pinctrl_ops = {
+	.get_groups_count = bcm281xx_pinctrl_get_groups_count,
+	.get_group_name = bcm281xx_pinctrl_get_group_name,
+	.get_group_pins = bcm281xx_pinctrl_get_group_pins,
+	.pin_dbg_show = bcm281xx_pinctrl_pin_dbg_show,
+	.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
+	.dt_free_map = pinctrl_utils_dt_free_map,
+};
+
+static int bcm281xx_pinctrl_get_fcns_count(struct pinctrl_dev *pctldev)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+
+	return pdata->nfunctions;
+}
+
+static const char *bcm281xx_pinctrl_get_fcn_name(struct pinctrl_dev *pctldev,
+						 unsigned function)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+
+	return pdata->functions[function].name;
+}
+
+static int bcm281xx_pinctrl_get_fcn_groups(struct pinctrl_dev *pctldev,
+					   unsigned function,
+					   const char * const **groups,
+					   unsigned * const num_groups)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+
+	*groups = pdata->functions[function].groups;
+	*num_groups = pdata->functions[function].ngroups;
+
+	return 0;
+}
+
+static int bcm281xx_pinmux_set(struct pinctrl_dev *pctldev,
+			       unsigned function,
+			       unsigned group)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+	const struct bcm281xx_pin_function *f = &pdata->functions[function];
+	u32 offset = 4 * pdata->pins[group].number;
+	int rc = 0;
+
+	dev_dbg(pctldev->dev,
+		"%s(): Enable function %s (%d) of pin %s (%d) @offset 0x%x.\n",
+		__func__, f->name, function, pdata->pins[group].name,
+		pdata->pins[group].number, offset);
+
+	rc = regmap_update_bits(pdata->regmap, offset,
+		BCM281XX_PIN_REG_F_SEL_MASK,
+		function << BCM281XX_PIN_REG_F_SEL_SHIFT);
+	if (rc)
+		dev_err(pctldev->dev,
+			"Error updating register for pin %s (%d).\n",
+			pdata->pins[group].name, pdata->pins[group].number);
+
+	return rc;
+}
+
+static struct pinmux_ops bcm281xx_pinctrl_pinmux_ops = {
+	.get_functions_count = bcm281xx_pinctrl_get_fcns_count,
+	.get_function_name = bcm281xx_pinctrl_get_fcn_name,
+	.get_function_groups = bcm281xx_pinctrl_get_fcn_groups,
+	.set_mux = bcm281xx_pinmux_set,
+};
+
+static int bcm281xx_pinctrl_pin_config_get(struct pinctrl_dev *pctldev,
+					   unsigned pin,
+					   unsigned long *config)
+{
+	return -ENOTSUPP;
+}
+
+
+/* Goes through the configs and update register val/mask */
+static int bcm281xx_std_pin_update(struct pinctrl_dev *pctldev,
+				   unsigned pin,
+				   unsigned long *configs,
+				   unsigned num_configs,
+				   u32 *val,
+				   u32 *mask)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+	int i;
+	enum pin_config_param param;
+	u16 arg;
+
+	for (i = 0; i < num_configs; i++) {
+		param = pinconf_to_config_param(configs[i]);
+		arg = pinconf_to_config_argument(configs[i]);
+
+		switch (param) {
+		case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
+			arg = (arg >= 1 ? 1 : 0);
+			bcm281xx_pin_update(val, mask, arg,
+				BCM281XX_PIN_SHIFT(STD, HYST),
+				BCM281XX_PIN_MASK(STD, HYST));
+			break;
+		/*
+		 * The pin bias can only be one of pull-up, pull-down, or
+		 * disable.  The user does not need to specify a value for the
+		 * property, and the default value from pinconf-generic is
+		 * ignored.
+		 */
+		case PIN_CONFIG_BIAS_DISABLE:
+			bcm281xx_pin_update(val, mask, 0,
+				BCM281XX_PIN_SHIFT(STD, PULL_UP),
+				BCM281XX_PIN_MASK(STD, PULL_UP));
+			bcm281xx_pin_update(val, mask, 0,
+				BCM281XX_PIN_SHIFT(STD, PULL_DN),
+				BCM281XX_PIN_MASK(STD, PULL_DN));
+			break;
+
+		case PIN_CONFIG_BIAS_PULL_UP:
+			bcm281xx_pin_update(val, mask, 1,
+				BCM281XX_PIN_SHIFT(STD, PULL_UP),
+				BCM281XX_PIN_MASK(STD, PULL_UP));
+			bcm281xx_pin_update(val, mask, 0,
+				BCM281XX_PIN_SHIFT(STD, PULL_DN),
+				BCM281XX_PIN_MASK(STD, PULL_DN));
+			break;
+
+		case PIN_CONFIG_BIAS_PULL_DOWN:
+			bcm281xx_pin_update(val, mask, 0,
+				BCM281XX_PIN_SHIFT(STD, PULL_UP),
+				BCM281XX_PIN_MASK(STD, PULL_UP));
+			bcm281xx_pin_update(val, mask, 1,
+				BCM281XX_PIN_SHIFT(STD, PULL_DN),
+				BCM281XX_PIN_MASK(STD, PULL_DN));
+			break;
+
+		case PIN_CONFIG_SLEW_RATE:
+			arg = (arg >= 1 ? 1 : 0);
+			bcm281xx_pin_update(val, mask, arg,
+				BCM281XX_PIN_SHIFT(STD, SLEW),
+				BCM281XX_PIN_MASK(STD, SLEW));
+			break;
+
+		case PIN_CONFIG_INPUT_ENABLE:
+			/* inversed since register is for input _disable_ */
+			arg = (arg >= 1 ? 0 : 1);
+			bcm281xx_pin_update(val, mask, arg,
+				BCM281XX_PIN_SHIFT(STD, INPUT_DIS),
+				BCM281XX_PIN_MASK(STD, INPUT_DIS));
+			break;
+
+		case PIN_CONFIG_DRIVE_STRENGTH:
+			/* Valid range is 2-16 mA, even numbers only */
+			if ((arg < 2) || (arg > 16) || (arg % 2)) {
+				dev_err(pctldev->dev,
+					"Invalid Drive Strength value (%d) for "
+					"pin %s (%d). Valid values are "
+					"(2..16) mA, even numbers only.\n",
+					arg, pdata->pins[pin].name, pin);
+				return -EINVAL;
+			}
+			bcm281xx_pin_update(val, mask, (arg/2)-1,
+				BCM281XX_PIN_SHIFT(STD, DRV_STR),
+				BCM281XX_PIN_MASK(STD, DRV_STR));
+			break;
+
+		default:
+			dev_err(pctldev->dev,
+				"Unrecognized pin config %d for pin %s (%d).\n",
+				param, pdata->pins[pin].name, pin);
+			return -EINVAL;
+
+		} /* switch config */
+	} /* for each config */
+
+	return 0;
+}
+
+/*
+ * The pull-up strength for an I2C pin is represented by bits 4-6 in the
+ * register with the following mapping:
+ *   0b000: No pull-up
+ *   0b001: 1200 Ohm
+ *   0b010: 1800 Ohm
+ *   0b011: 720 Ohm
+ *   0b100: 2700 Ohm
+ *   0b101: 831 Ohm
+ *   0b110: 1080 Ohm
+ *   0b111: 568 Ohm
+ * This array maps pull-up strength in Ohms to register values (1+index).
+ */
+static const u16 bcm281xx_pullup_map[] = {
+	1200, 1800, 720, 2700, 831, 1080, 568
+};
+
+/* Goes through the configs and update register val/mask */
+static int bcm281xx_i2c_pin_update(struct pinctrl_dev *pctldev,
+				   unsigned pin,
+				   unsigned long *configs,
+				   unsigned num_configs,
+				   u32 *val,
+				   u32 *mask)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+	int i, j;
+	enum pin_config_param param;
+	u16 arg;
+
+	for (i = 0; i < num_configs; i++) {
+		param = pinconf_to_config_param(configs[i]);
+		arg = pinconf_to_config_argument(configs[i]);
+
+		switch (param) {
+		case PIN_CONFIG_BIAS_PULL_UP:
+			for (j = 0; j < ARRAY_SIZE(bcm281xx_pullup_map); j++)
+				if (bcm281xx_pullup_map[j] == arg)
+					break;
+
+			if (j == ARRAY_SIZE(bcm281xx_pullup_map)) {
+				dev_err(pctldev->dev,
+					"Invalid pull-up value (%d) for pin %s "
+					"(%d). Valid values are 568, 720, 831, "
+					"1080, 1200, 1800, 2700 Ohms.\n",
+					arg, pdata->pins[pin].name, pin);
+				return -EINVAL;
+			}
+
+			bcm281xx_pin_update(val, mask, j+1,
+				BCM281XX_PIN_SHIFT(I2C, PULL_UP_STR),
+				BCM281XX_PIN_MASK(I2C, PULL_UP_STR));
+			break;
+
+		case PIN_CONFIG_BIAS_DISABLE:
+			bcm281xx_pin_update(val, mask, 0,
+				BCM281XX_PIN_SHIFT(I2C, PULL_UP_STR),
+				BCM281XX_PIN_MASK(I2C, PULL_UP_STR));
+			break;
+
+		case PIN_CONFIG_SLEW_RATE:
+			arg = (arg >= 1 ? 1 : 0);
+			bcm281xx_pin_update(val, mask, arg,
+				BCM281XX_PIN_SHIFT(I2C, SLEW),
+				BCM281XX_PIN_MASK(I2C, SLEW));
+			break;
+
+		case PIN_CONFIG_INPUT_ENABLE:
+			/* inversed since register is for input _disable_ */
+			arg = (arg >= 1 ? 0 : 1);
+			bcm281xx_pin_update(val, mask, arg,
+				BCM281XX_PIN_SHIFT(I2C, INPUT_DIS),
+				BCM281XX_PIN_MASK(I2C, INPUT_DIS));
+			break;
+
+		default:
+			dev_err(pctldev->dev,
+				"Unrecognized pin config %d for pin %s (%d).\n",
+				param, pdata->pins[pin].name, pin);
+			return -EINVAL;
+
+		} /* switch config */
+	} /* for each config */
+
+	return 0;
+}
+
+/* Goes through the configs and update register val/mask */
+static int bcm281xx_hdmi_pin_update(struct pinctrl_dev *pctldev,
+				    unsigned pin,
+				    unsigned long *configs,
+				    unsigned num_configs,
+				    u32 *val,
+				    u32 *mask)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+	int i;
+	enum pin_config_param param;
+	u16 arg;
+
+	for (i = 0; i < num_configs; i++) {
+		param = pinconf_to_config_param(configs[i]);
+		arg = pinconf_to_config_argument(configs[i]);
+
+		switch (param) {
+		case PIN_CONFIG_SLEW_RATE:
+			arg = (arg >= 1 ? 1 : 0);
+			bcm281xx_pin_update(val, mask, arg,
+				BCM281XX_PIN_SHIFT(HDMI, MODE),
+				BCM281XX_PIN_MASK(HDMI, MODE));
+			break;
+
+		case PIN_CONFIG_INPUT_ENABLE:
+			/* inversed since register is for input _disable_ */
+			arg = (arg >= 1 ? 0 : 1);
+			bcm281xx_pin_update(val, mask, arg,
+				BCM281XX_PIN_SHIFT(HDMI, INPUT_DIS),
+				BCM281XX_PIN_MASK(HDMI, INPUT_DIS));
+			break;
+
+		default:
+			dev_err(pctldev->dev,
+				"Unrecognized pin config %d for pin %s (%d).\n",
+				param, pdata->pins[pin].name, pin);
+			return -EINVAL;
+
+		} /* switch config */
+	} /* for each config */
+
+	return 0;
+}
+
+static int bcm281xx_pinctrl_pin_config_set(struct pinctrl_dev *pctldev,
+					   unsigned pin,
+					   unsigned long *configs,
+					   unsigned num_configs)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+	enum bcm281xx_pin_type pin_type;
+	u32 offset = 4 * pin;
+	u32 cfg_val, cfg_mask;
+	int rc;
+
+	cfg_val = 0;
+	cfg_mask = 0;
+	pin_type = pin_type_get(pctldev, pin);
+
+	/* Different pins have different configuration options */
+	switch (pin_type) {
+	case BCM281XX_PIN_TYPE_STD:
+		rc = bcm281xx_std_pin_update(pctldev, pin, configs,
+			num_configs, &cfg_val, &cfg_mask);
+		break;
+
+	case BCM281XX_PIN_TYPE_I2C:
+		rc = bcm281xx_i2c_pin_update(pctldev, pin, configs,
+			num_configs, &cfg_val, &cfg_mask);
+		break;
+
+	case BCM281XX_PIN_TYPE_HDMI:
+		rc = bcm281xx_hdmi_pin_update(pctldev, pin, configs,
+			num_configs, &cfg_val, &cfg_mask);
+		break;
+
+	default:
+		dev_err(pctldev->dev, "Unknown pin type for pin %s (%d).\n",
+			pdata->pins[pin].name, pin);
+		return -EINVAL;
+
+	} /* switch pin type */
+
+	if (rc)
+		return rc;
+
+	dev_dbg(pctldev->dev,
+		"%s(): Set pin %s (%d) with config 0x%x, mask 0x%x\n",
+		__func__, pdata->pins[pin].name, pin, cfg_val, cfg_mask);
+
+	rc = regmap_update_bits(pdata->regmap, offset, cfg_mask, cfg_val);
+	if (rc) {
+		dev_err(pctldev->dev,
+			"Error updating register for pin %s (%d).\n",
+			pdata->pins[pin].name, pin);
+		return rc;
+	}
+
+	return 0;
+}
+
+static struct pinconf_ops bcm281xx_pinctrl_pinconf_ops = {
+	.pin_config_get = bcm281xx_pinctrl_pin_config_get,
+	.pin_config_set = bcm281xx_pinctrl_pin_config_set,
+};
+
+static struct pinctrl_desc bcm281xx_pinctrl_desc = {
+	/* name, pins, npins members initialized in probe function */
+	.pctlops = &bcm281xx_pinctrl_ops,
+	.pmxops = &bcm281xx_pinctrl_pinmux_ops,
+	.confops = &bcm281xx_pinctrl_pinconf_ops,
+	.owner = THIS_MODULE,
+};
+
+static int __init bcm281xx_pinctrl_probe(struct platform_device *pdev)
+{
+	struct bcm281xx_pinctrl_data *pdata = &bcm281xx_pinctrl;
+	struct resource *res;
+	struct pinctrl_dev *pctl;
+
+	/* So far We can assume there is only 1 bank of registers */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	pdata->reg_base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(pdata->reg_base)) {
+		dev_err(&pdev->dev, "Failed to ioremap MEM resource\n");
+		return -ENODEV;
+	}
+
+	/* Initialize the dynamic part of pinctrl_desc */
+	pdata->regmap = devm_regmap_init_mmio(&pdev->dev, pdata->reg_base,
+		&bcm281xx_pinctrl_regmap_config);
+	if (IS_ERR(pdata->regmap)) {
+		dev_err(&pdev->dev, "Regmap MMIO init failed.\n");
+		return -ENODEV;
+	}
+
+	bcm281xx_pinctrl_desc.name = dev_name(&pdev->dev);
+	bcm281xx_pinctrl_desc.pins = bcm281xx_pinctrl.pins;
+	bcm281xx_pinctrl_desc.npins = bcm281xx_pinctrl.npins;
+
+	pctl = pinctrl_register(&bcm281xx_pinctrl_desc,
+				&pdev->dev,
+				pdata);
+	if (!pctl) {
+		dev_err(&pdev->dev, "Failed to register pinctrl\n");
+		return -ENODEV;
+	}
+
+	platform_set_drvdata(pdev, pdata);
+
+	return 0;
+}
+
+static struct of_device_id bcm281xx_pinctrl_of_match[] = {
+	{ .compatible = "brcm,bcm11351-pinctrl", },
+	{ },
+};
+
+static struct platform_driver bcm281xx_pinctrl_driver = {
+	.driver = {
+		.name = "bcm281xx-pinctrl",
+		.of_match_table = bcm281xx_pinctrl_of_match,
+	},
+};
+
+module_platform_driver_probe(bcm281xx_pinctrl_driver, bcm281xx_pinctrl_probe);
+
+MODULE_AUTHOR("Broadcom Corporation <bcm-kernel-feedback-list@broadcom.com>");
+MODULE_AUTHOR("Sherman Yin <syin@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom BCM281xx pinctrl driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/pinctrl/bcm/pinctrl-bcm2835.c b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
new file mode 100644
index 0000000..9aa8a3f
--- /dev/null
+++ b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
@@ -0,0 +1,1072 @@
+/*
+ * Driver for Broadcom BCM2835 GPIO unit (pinctrl + GPIO)
+ *
+ * Copyright (C) 2012 Chris Boot, Simon Arlott, Stephen Warren
+ *
+ * This driver is inspired by:
+ * pinctrl-nomadik.c, please see original file for copyright information
+ * pinctrl-tegra.c, please see original file for copyright information
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/bitmap.h>
+#include <linux/bug.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/irqdesc.h>
+#include <linux/irqdomain.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/pinctrl/machine.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/platform_device.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+
+#define MODULE_NAME "pinctrl-bcm2835"
+#define BCM2835_NUM_GPIOS 54
+#define BCM2835_NUM_BANKS 2
+
+#define BCM2835_PIN_BITMAP_SZ \
+	DIV_ROUND_UP(BCM2835_NUM_GPIOS, sizeof(unsigned long) * 8)
+
+/* GPIO register offsets */
+#define GPFSEL0		0x0	/* Function Select */
+#define GPSET0		0x1c	/* Pin Output Set */
+#define GPCLR0		0x28	/* Pin Output Clear */
+#define GPLEV0		0x34	/* Pin Level */
+#define GPEDS0		0x40	/* Pin Event Detect Status */
+#define GPREN0		0x4c	/* Pin Rising Edge Detect Enable */
+#define GPFEN0		0x58	/* Pin Falling Edge Detect Enable */
+#define GPHEN0		0x64	/* Pin High Detect Enable */
+#define GPLEN0		0x70	/* Pin Low Detect Enable */
+#define GPAREN0		0x7c	/* Pin Async Rising Edge Detect */
+#define GPAFEN0		0x88	/* Pin Async Falling Edge Detect */
+#define GPPUD		0x94	/* Pin Pull-up/down Enable */
+#define GPPUDCLK0	0x98	/* Pin Pull-up/down Enable Clock */
+
+#define FSEL_REG(p)		(GPFSEL0 + (((p) / 10) * 4))
+#define FSEL_SHIFT(p)		(((p) % 10) * 3)
+#define GPIO_REG_OFFSET(p)	((p) / 32)
+#define GPIO_REG_SHIFT(p)	((p) % 32)
+
+enum bcm2835_pinconf_param {
+	/* argument: bcm2835_pinconf_pull */
+	BCM2835_PINCONF_PARAM_PULL,
+};
+
+enum bcm2835_pinconf_pull {
+	BCM2835_PINCONFIG_PULL_NONE,
+	BCM2835_PINCONFIG_PULL_DOWN,
+	BCM2835_PINCONFIG_PULL_UP,
+};
+
+#define BCM2835_PINCONF_PACK(_param_, _arg_) ((_param_) << 16 | (_arg_))
+#define BCM2835_PINCONF_UNPACK_PARAM(_conf_) ((_conf_) >> 16)
+#define BCM2835_PINCONF_UNPACK_ARG(_conf_) ((_conf_) & 0xffff)
+
+struct bcm2835_gpio_irqdata {
+	struct bcm2835_pinctrl *pc;
+	int bank;
+};
+
+struct bcm2835_pinctrl {
+	struct device *dev;
+	void __iomem *base;
+	int irq[BCM2835_NUM_BANKS];
+
+	/* note: locking assumes each bank will have its own unsigned long */
+	unsigned long enabled_irq_map[BCM2835_NUM_BANKS];
+	unsigned int irq_type[BCM2835_NUM_GPIOS];
+
+	struct pinctrl_dev *pctl_dev;
+	struct irq_domain *irq_domain;
+	struct gpio_chip gpio_chip;
+	struct pinctrl_gpio_range gpio_range;
+
+	struct bcm2835_gpio_irqdata irq_data[BCM2835_NUM_BANKS];
+	spinlock_t irq_lock[BCM2835_NUM_BANKS];
+};
+
+static struct lock_class_key gpio_lock_class;
+
+/* pins are just named GPIO0..GPIO53 */
+#define BCM2835_GPIO_PIN(a) PINCTRL_PIN(a, "gpio" #a)
+static struct pinctrl_pin_desc bcm2835_gpio_pins[] = {
+	BCM2835_GPIO_PIN(0),
+	BCM2835_GPIO_PIN(1),
+	BCM2835_GPIO_PIN(2),
+	BCM2835_GPIO_PIN(3),
+	BCM2835_GPIO_PIN(4),
+	BCM2835_GPIO_PIN(5),
+	BCM2835_GPIO_PIN(6),
+	BCM2835_GPIO_PIN(7),
+	BCM2835_GPIO_PIN(8),
+	BCM2835_GPIO_PIN(9),
+	BCM2835_GPIO_PIN(10),
+	BCM2835_GPIO_PIN(11),
+	BCM2835_GPIO_PIN(12),
+	BCM2835_GPIO_PIN(13),
+	BCM2835_GPIO_PIN(14),
+	BCM2835_GPIO_PIN(15),
+	BCM2835_GPIO_PIN(16),
+	BCM2835_GPIO_PIN(17),
+	BCM2835_GPIO_PIN(18),
+	BCM2835_GPIO_PIN(19),
+	BCM2835_GPIO_PIN(20),
+	BCM2835_GPIO_PIN(21),
+	BCM2835_GPIO_PIN(22),
+	BCM2835_GPIO_PIN(23),
+	BCM2835_GPIO_PIN(24),
+	BCM2835_GPIO_PIN(25),
+	BCM2835_GPIO_PIN(26),
+	BCM2835_GPIO_PIN(27),
+	BCM2835_GPIO_PIN(28),
+	BCM2835_GPIO_PIN(29),
+	BCM2835_GPIO_PIN(30),
+	BCM2835_GPIO_PIN(31),
+	BCM2835_GPIO_PIN(32),
+	BCM2835_GPIO_PIN(33),
+	BCM2835_GPIO_PIN(34),
+	BCM2835_GPIO_PIN(35),
+	BCM2835_GPIO_PIN(36),
+	BCM2835_GPIO_PIN(37),
+	BCM2835_GPIO_PIN(38),
+	BCM2835_GPIO_PIN(39),
+	BCM2835_GPIO_PIN(40),
+	BCM2835_GPIO_PIN(41),
+	BCM2835_GPIO_PIN(42),
+	BCM2835_GPIO_PIN(43),
+	BCM2835_GPIO_PIN(44),
+	BCM2835_GPIO_PIN(45),
+	BCM2835_GPIO_PIN(46),
+	BCM2835_GPIO_PIN(47),
+	BCM2835_GPIO_PIN(48),
+	BCM2835_GPIO_PIN(49),
+	BCM2835_GPIO_PIN(50),
+	BCM2835_GPIO_PIN(51),
+	BCM2835_GPIO_PIN(52),
+	BCM2835_GPIO_PIN(53),
+};
+
+/* one pin per group */
+static const char * const bcm2835_gpio_groups[] = {
+	"gpio0",
+	"gpio1",
+	"gpio2",
+	"gpio3",
+	"gpio4",
+	"gpio5",
+	"gpio6",
+	"gpio7",
+	"gpio8",
+	"gpio9",
+	"gpio10",
+	"gpio11",
+	"gpio12",
+	"gpio13",
+	"gpio14",
+	"gpio15",
+	"gpio16",
+	"gpio17",
+	"gpio18",
+	"gpio19",
+	"gpio20",
+	"gpio21",
+	"gpio22",
+	"gpio23",
+	"gpio24",
+	"gpio25",
+	"gpio26",
+	"gpio27",
+	"gpio28",
+	"gpio29",
+	"gpio30",
+	"gpio31",
+	"gpio32",
+	"gpio33",
+	"gpio34",
+	"gpio35",
+	"gpio36",
+	"gpio37",
+	"gpio38",
+	"gpio39",
+	"gpio40",
+	"gpio41",
+	"gpio42",
+	"gpio43",
+	"gpio44",
+	"gpio45",
+	"gpio46",
+	"gpio47",
+	"gpio48",
+	"gpio49",
+	"gpio50",
+	"gpio51",
+	"gpio52",
+	"gpio53",
+};
+
+enum bcm2835_fsel {
+	BCM2835_FSEL_GPIO_IN = 0,
+	BCM2835_FSEL_GPIO_OUT = 1,
+	BCM2835_FSEL_ALT0 = 4,
+	BCM2835_FSEL_ALT1 = 5,
+	BCM2835_FSEL_ALT2 = 6,
+	BCM2835_FSEL_ALT3 = 7,
+	BCM2835_FSEL_ALT4 = 3,
+	BCM2835_FSEL_ALT5 = 2,
+	BCM2835_FSEL_COUNT = 8,
+	BCM2835_FSEL_MASK = 0x7,
+};
+
+static const char * const bcm2835_functions[BCM2835_FSEL_COUNT] = {
+	[BCM2835_FSEL_GPIO_IN] = "gpio_in",
+	[BCM2835_FSEL_GPIO_OUT] = "gpio_out",
+	[BCM2835_FSEL_ALT0] = "alt0",
+	[BCM2835_FSEL_ALT1] = "alt1",
+	[BCM2835_FSEL_ALT2] = "alt2",
+	[BCM2835_FSEL_ALT3] = "alt3",
+	[BCM2835_FSEL_ALT4] = "alt4",
+	[BCM2835_FSEL_ALT5] = "alt5",
+};
+
+static const char * const irq_type_names[] = {
+	[IRQ_TYPE_NONE] = "none",
+	[IRQ_TYPE_EDGE_RISING] = "edge-rising",
+	[IRQ_TYPE_EDGE_FALLING] = "edge-falling",
+	[IRQ_TYPE_EDGE_BOTH] = "edge-both",
+	[IRQ_TYPE_LEVEL_HIGH] = "level-high",
+	[IRQ_TYPE_LEVEL_LOW] = "level-low",
+};
+
+static inline u32 bcm2835_gpio_rd(struct bcm2835_pinctrl *pc, unsigned reg)
+{
+	return readl(pc->base + reg);
+}
+
+static inline void bcm2835_gpio_wr(struct bcm2835_pinctrl *pc, unsigned reg,
+		u32 val)
+{
+	writel(val, pc->base + reg);
+}
+
+static inline int bcm2835_gpio_get_bit(struct bcm2835_pinctrl *pc, unsigned reg,
+		unsigned bit)
+{
+	reg += GPIO_REG_OFFSET(bit) * 4;
+	return (bcm2835_gpio_rd(pc, reg) >> GPIO_REG_SHIFT(bit)) & 1;
+}
+
+/* note NOT a read/modify/write cycle */
+static inline void bcm2835_gpio_set_bit(struct bcm2835_pinctrl *pc,
+		unsigned reg, unsigned bit)
+{
+	reg += GPIO_REG_OFFSET(bit) * 4;
+	bcm2835_gpio_wr(pc, reg, BIT(GPIO_REG_SHIFT(bit)));
+}
+
+static inline enum bcm2835_fsel bcm2835_pinctrl_fsel_get(
+		struct bcm2835_pinctrl *pc, unsigned pin)
+{
+	u32 val = bcm2835_gpio_rd(pc, FSEL_REG(pin));
+	enum bcm2835_fsel status = (val >> FSEL_SHIFT(pin)) & BCM2835_FSEL_MASK;
+
+	dev_dbg(pc->dev, "get %08x (%u => %s)\n", val, pin,
+			bcm2835_functions[status]);
+
+	return status;
+}
+
+static inline void bcm2835_pinctrl_fsel_set(
+		struct bcm2835_pinctrl *pc, unsigned pin,
+		enum bcm2835_fsel fsel)
+{
+	u32 val = bcm2835_gpio_rd(pc, FSEL_REG(pin));
+	enum bcm2835_fsel cur = (val >> FSEL_SHIFT(pin)) & BCM2835_FSEL_MASK;
+
+	dev_dbg(pc->dev, "read %08x (%u => %s)\n", val, pin,
+			bcm2835_functions[cur]);
+
+	if (cur == fsel)
+		return;
+
+	if (cur != BCM2835_FSEL_GPIO_IN && fsel != BCM2835_FSEL_GPIO_IN) {
+		/* always transition through GPIO_IN */
+		val &= ~(BCM2835_FSEL_MASK << FSEL_SHIFT(pin));
+		val |= BCM2835_FSEL_GPIO_IN << FSEL_SHIFT(pin);
+
+		dev_dbg(pc->dev, "trans %08x (%u <= %s)\n", val, pin,
+				bcm2835_functions[BCM2835_FSEL_GPIO_IN]);
+		bcm2835_gpio_wr(pc, FSEL_REG(pin), val);
+	}
+
+	val &= ~(BCM2835_FSEL_MASK << FSEL_SHIFT(pin));
+	val |= fsel << FSEL_SHIFT(pin);
+
+	dev_dbg(pc->dev, "write %08x (%u <= %s)\n", val, pin,
+			bcm2835_functions[fsel]);
+	bcm2835_gpio_wr(pc, FSEL_REG(pin), val);
+}
+
+static int bcm2835_gpio_request(struct gpio_chip *chip, unsigned offset)
+{
+	return pinctrl_request_gpio(chip->base + offset);
+}
+
+static void bcm2835_gpio_free(struct gpio_chip *chip, unsigned offset)
+{
+	pinctrl_free_gpio(chip->base + offset);
+}
+
+static int bcm2835_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+	return pinctrl_gpio_direction_input(chip->base + offset);
+}
+
+static int bcm2835_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+	struct bcm2835_pinctrl *pc = dev_get_drvdata(chip->dev);
+
+	return bcm2835_gpio_get_bit(pc, GPLEV0, offset);
+}
+
+static int bcm2835_gpio_direction_output(struct gpio_chip *chip,
+		unsigned offset, int value)
+{
+	return pinctrl_gpio_direction_output(chip->base + offset);
+}
+
+static void bcm2835_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+	struct bcm2835_pinctrl *pc = dev_get_drvdata(chip->dev);
+
+	bcm2835_gpio_set_bit(pc, value ? GPSET0 : GPCLR0, offset);
+}
+
+static int bcm2835_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+	struct bcm2835_pinctrl *pc = dev_get_drvdata(chip->dev);
+
+	return irq_linear_revmap(pc->irq_domain, offset);
+}
+
+static struct gpio_chip bcm2835_gpio_chip = {
+	.label = MODULE_NAME,
+	.owner = THIS_MODULE,
+	.request = bcm2835_gpio_request,
+	.free = bcm2835_gpio_free,
+	.direction_input = bcm2835_gpio_direction_input,
+	.direction_output = bcm2835_gpio_direction_output,
+	.get = bcm2835_gpio_get,
+	.set = bcm2835_gpio_set,
+	.to_irq = bcm2835_gpio_to_irq,
+	.base = -1,
+	.ngpio = BCM2835_NUM_GPIOS,
+	.can_sleep = false,
+};
+
+static irqreturn_t bcm2835_gpio_irq_handler(int irq, void *dev_id)
+{
+	struct bcm2835_gpio_irqdata *irqdata = dev_id;
+	struct bcm2835_pinctrl *pc = irqdata->pc;
+	int bank = irqdata->bank;
+	unsigned long events;
+	unsigned offset;
+	unsigned gpio;
+	unsigned int type;
+
+	events = bcm2835_gpio_rd(pc, GPEDS0 + bank * 4);
+	events &= pc->enabled_irq_map[bank];
+	for_each_set_bit(offset, &events, 32) {
+		gpio = (32 * bank) + offset;
+		type = pc->irq_type[gpio];
+
+		/* ack edge triggered IRQs immediately */
+		if (!(type & IRQ_TYPE_LEVEL_MASK))
+			bcm2835_gpio_set_bit(pc, GPEDS0, gpio);
+
+		generic_handle_irq(irq_linear_revmap(pc->irq_domain, gpio));
+
+		/* ack level triggered IRQ after handling them */
+		if (type & IRQ_TYPE_LEVEL_MASK)
+			bcm2835_gpio_set_bit(pc, GPEDS0, gpio);
+	}
+	return events ? IRQ_HANDLED : IRQ_NONE;
+}
+
+static inline void __bcm2835_gpio_irq_config(struct bcm2835_pinctrl *pc,
+	unsigned reg, unsigned offset, bool enable)
+{
+	u32 value;
+	reg += GPIO_REG_OFFSET(offset) * 4;
+	value = bcm2835_gpio_rd(pc, reg);
+	if (enable)
+		value |= BIT(GPIO_REG_SHIFT(offset));
+	else
+		value &= ~(BIT(GPIO_REG_SHIFT(offset)));
+	bcm2835_gpio_wr(pc, reg, value);
+}
+
+/* fast path for IRQ handler */
+static void bcm2835_gpio_irq_config(struct bcm2835_pinctrl *pc,
+	unsigned offset, bool enable)
+{
+	switch (pc->irq_type[offset]) {
+	case IRQ_TYPE_EDGE_RISING:
+		__bcm2835_gpio_irq_config(pc, GPREN0, offset, enable);
+		break;
+
+	case IRQ_TYPE_EDGE_FALLING:
+		__bcm2835_gpio_irq_config(pc, GPFEN0, offset, enable);
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		__bcm2835_gpio_irq_config(pc, GPREN0, offset, enable);
+		__bcm2835_gpio_irq_config(pc, GPFEN0, offset, enable);
+		break;
+
+	case IRQ_TYPE_LEVEL_HIGH:
+		__bcm2835_gpio_irq_config(pc, GPHEN0, offset, enable);
+		break;
+
+	case IRQ_TYPE_LEVEL_LOW:
+		__bcm2835_gpio_irq_config(pc, GPLEN0, offset, enable);
+		break;
+	}
+}
+
+static void bcm2835_gpio_irq_enable(struct irq_data *data)
+{
+	struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data);
+	unsigned gpio = irqd_to_hwirq(data);
+	unsigned offset = GPIO_REG_SHIFT(gpio);
+	unsigned bank = GPIO_REG_OFFSET(gpio);
+	unsigned long flags;
+
+	spin_lock_irqsave(&pc->irq_lock[bank], flags);
+	set_bit(offset, &pc->enabled_irq_map[bank]);
+	bcm2835_gpio_irq_config(pc, gpio, true);
+	spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
+}
+
+static void bcm2835_gpio_irq_disable(struct irq_data *data)
+{
+	struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data);
+	unsigned gpio = irqd_to_hwirq(data);
+	unsigned offset = GPIO_REG_SHIFT(gpio);
+	unsigned bank = GPIO_REG_OFFSET(gpio);
+	unsigned long flags;
+
+	spin_lock_irqsave(&pc->irq_lock[bank], flags);
+	bcm2835_gpio_irq_config(pc, gpio, false);
+	clear_bit(offset, &pc->enabled_irq_map[bank]);
+	spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
+}
+
+static int __bcm2835_gpio_irq_set_type_disabled(struct bcm2835_pinctrl *pc,
+	unsigned offset, unsigned int type)
+{
+	switch (type) {
+	case IRQ_TYPE_NONE:
+	case IRQ_TYPE_EDGE_RISING:
+	case IRQ_TYPE_EDGE_FALLING:
+	case IRQ_TYPE_EDGE_BOTH:
+	case IRQ_TYPE_LEVEL_HIGH:
+	case IRQ_TYPE_LEVEL_LOW:
+		pc->irq_type[offset] = type;
+		break;
+
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+/* slower path for reconfiguring IRQ type */
+static int __bcm2835_gpio_irq_set_type_enabled(struct bcm2835_pinctrl *pc,
+	unsigned offset, unsigned int type)
+{
+	switch (type) {
+	case IRQ_TYPE_NONE:
+		if (pc->irq_type[offset] != type) {
+			bcm2835_gpio_irq_config(pc, offset, false);
+			pc->irq_type[offset] = type;
+		}
+		break;
+
+	case IRQ_TYPE_EDGE_RISING:
+		if (pc->irq_type[offset] == IRQ_TYPE_EDGE_BOTH) {
+			/* RISING already enabled, disable FALLING */
+			pc->irq_type[offset] = IRQ_TYPE_EDGE_FALLING;
+			bcm2835_gpio_irq_config(pc, offset, false);
+			pc->irq_type[offset] = type;
+		} else if (pc->irq_type[offset] != type) {
+			bcm2835_gpio_irq_config(pc, offset, false);
+			pc->irq_type[offset] = type;
+			bcm2835_gpio_irq_config(pc, offset, true);
+		}
+		break;
+
+	case IRQ_TYPE_EDGE_FALLING:
+		if (pc->irq_type[offset] == IRQ_TYPE_EDGE_BOTH) {
+			/* FALLING already enabled, disable RISING */
+			pc->irq_type[offset] = IRQ_TYPE_EDGE_RISING;
+			bcm2835_gpio_irq_config(pc, offset, false);
+			pc->irq_type[offset] = type;
+		} else if (pc->irq_type[offset] != type) {
+			bcm2835_gpio_irq_config(pc, offset, false);
+			pc->irq_type[offset] = type;
+			bcm2835_gpio_irq_config(pc, offset, true);
+		}
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		if (pc->irq_type[offset] == IRQ_TYPE_EDGE_RISING) {
+			/* RISING already enabled, enable FALLING too */
+			pc->irq_type[offset] = IRQ_TYPE_EDGE_FALLING;
+			bcm2835_gpio_irq_config(pc, offset, true);
+			pc->irq_type[offset] = type;
+		} else if (pc->irq_type[offset] == IRQ_TYPE_EDGE_FALLING) {
+			/* FALLING already enabled, enable RISING too */
+			pc->irq_type[offset] = IRQ_TYPE_EDGE_RISING;
+			bcm2835_gpio_irq_config(pc, offset, true);
+			pc->irq_type[offset] = type;
+		} else if (pc->irq_type[offset] != type) {
+			bcm2835_gpio_irq_config(pc, offset, false);
+			pc->irq_type[offset] = type;
+			bcm2835_gpio_irq_config(pc, offset, true);
+		}
+		break;
+
+	case IRQ_TYPE_LEVEL_HIGH:
+	case IRQ_TYPE_LEVEL_LOW:
+		if (pc->irq_type[offset] != type) {
+			bcm2835_gpio_irq_config(pc, offset, false);
+			pc->irq_type[offset] = type;
+			bcm2835_gpio_irq_config(pc, offset, true);
+		}
+		break;
+
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int bcm2835_gpio_irq_set_type(struct irq_data *data, unsigned int type)
+{
+	struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data);
+	unsigned gpio = irqd_to_hwirq(data);
+	unsigned offset = GPIO_REG_SHIFT(gpio);
+	unsigned bank = GPIO_REG_OFFSET(gpio);
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&pc->irq_lock[bank], flags);
+
+	if (test_bit(offset, &pc->enabled_irq_map[bank]))
+		ret = __bcm2835_gpio_irq_set_type_enabled(pc, gpio, type);
+	else
+		ret = __bcm2835_gpio_irq_set_type_disabled(pc, gpio, type);
+
+	spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
+
+	return ret;
+}
+
+static struct irq_chip bcm2835_gpio_irq_chip = {
+	.name = MODULE_NAME,
+	.irq_enable = bcm2835_gpio_irq_enable,
+	.irq_disable = bcm2835_gpio_irq_disable,
+	.irq_set_type = bcm2835_gpio_irq_set_type,
+};
+
+static int bcm2835_pctl_get_groups_count(struct pinctrl_dev *pctldev)
+{
+	return ARRAY_SIZE(bcm2835_gpio_groups);
+}
+
+static const char *bcm2835_pctl_get_group_name(struct pinctrl_dev *pctldev,
+		unsigned selector)
+{
+	return bcm2835_gpio_groups[selector];
+}
+
+static int bcm2835_pctl_get_group_pins(struct pinctrl_dev *pctldev,
+		unsigned selector,
+		const unsigned **pins,
+		unsigned *num_pins)
+{
+	*pins = &bcm2835_gpio_pins[selector].number;
+	*num_pins = 1;
+
+	return 0;
+}
+
+static void bcm2835_pctl_pin_dbg_show(struct pinctrl_dev *pctldev,
+		struct seq_file *s,
+		unsigned offset)
+{
+	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
+	enum bcm2835_fsel fsel = bcm2835_pinctrl_fsel_get(pc, offset);
+	const char *fname = bcm2835_functions[fsel];
+	int value = bcm2835_gpio_get_bit(pc, GPLEV0, offset);
+	int irq = irq_find_mapping(pc->irq_domain, offset);
+
+	seq_printf(s, "function %s in %s; irq %d (%s)",
+		fname, value ? "hi" : "lo",
+		irq, irq_type_names[pc->irq_type[offset]]);
+}
+
+static void bcm2835_pctl_dt_free_map(struct pinctrl_dev *pctldev,
+		struct pinctrl_map *maps, unsigned num_maps)
+{
+	int i;
+
+	for (i = 0; i < num_maps; i++)
+		if (maps[i].type == PIN_MAP_TYPE_CONFIGS_PIN)
+			kfree(maps[i].data.configs.configs);
+
+	kfree(maps);
+}
+
+static int bcm2835_pctl_dt_node_to_map_func(struct bcm2835_pinctrl *pc,
+		struct device_node *np, u32 pin, u32 fnum,
+		struct pinctrl_map **maps)
+{
+	struct pinctrl_map *map = *maps;
+
+	if (fnum >= ARRAY_SIZE(bcm2835_functions)) {
+		dev_err(pc->dev, "%s: invalid brcm,function %d\n",
+			of_node_full_name(np), fnum);
+		return -EINVAL;
+	}
+
+	map->type = PIN_MAP_TYPE_MUX_GROUP;
+	map->data.mux.group = bcm2835_gpio_groups[pin];
+	map->data.mux.function = bcm2835_functions[fnum];
+	(*maps)++;
+
+	return 0;
+}
+
+static int bcm2835_pctl_dt_node_to_map_pull(struct bcm2835_pinctrl *pc,
+		struct device_node *np, u32 pin, u32 pull,
+		struct pinctrl_map **maps)
+{
+	struct pinctrl_map *map = *maps;
+	unsigned long *configs;
+
+	if (pull > 2) {
+		dev_err(pc->dev, "%s: invalid brcm,pull %d\n",
+			of_node_full_name(np), pull);
+		return -EINVAL;
+	}
+
+	configs = kzalloc(sizeof(*configs), GFP_KERNEL);
+	if (!configs)
+		return -ENOMEM;
+	configs[0] = BCM2835_PINCONF_PACK(BCM2835_PINCONF_PARAM_PULL, pull);
+
+	map->type = PIN_MAP_TYPE_CONFIGS_PIN;
+	map->data.configs.group_or_pin = bcm2835_gpio_pins[pin].name;
+	map->data.configs.configs = configs;
+	map->data.configs.num_configs = 1;
+	(*maps)++;
+
+	return 0;
+}
+
+static int bcm2835_pctl_dt_node_to_map(struct pinctrl_dev *pctldev,
+		struct device_node *np,
+		struct pinctrl_map **map, unsigned *num_maps)
+{
+	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
+	struct property *pins, *funcs, *pulls;
+	int num_pins, num_funcs, num_pulls, maps_per_pin;
+	struct pinctrl_map *maps, *cur_map;
+	int i, err;
+	u32 pin, func, pull;
+
+	pins = of_find_property(np, "brcm,pins", NULL);
+	if (!pins) {
+		dev_err(pc->dev, "%s: missing brcm,pins property\n",
+				of_node_full_name(np));
+		return -EINVAL;
+	}
+
+	funcs = of_find_property(np, "brcm,function", NULL);
+	pulls = of_find_property(np, "brcm,pull", NULL);
+
+	if (!funcs && !pulls) {
+		dev_err(pc->dev,
+			"%s: neither brcm,function nor brcm,pull specified\n",
+			of_node_full_name(np));
+		return -EINVAL;
+	}
+
+	num_pins = pins->length / 4;
+	num_funcs = funcs ? (funcs->length / 4) : 0;
+	num_pulls = pulls ? (pulls->length / 4) : 0;
+
+	if (num_funcs > 1 && num_funcs != num_pins) {
+		dev_err(pc->dev,
+			"%s: brcm,function must have 1 or %d entries\n",
+			of_node_full_name(np), num_pins);
+		return -EINVAL;
+	}
+
+	if (num_pulls > 1 && num_pulls != num_pins) {
+		dev_err(pc->dev,
+			"%s: brcm,pull must have 1 or %d entries\n",
+			of_node_full_name(np), num_pins);
+		return -EINVAL;
+	}
+
+	maps_per_pin = 0;
+	if (num_funcs)
+		maps_per_pin++;
+	if (num_pulls)
+		maps_per_pin++;
+	cur_map = maps = kzalloc(num_pins * maps_per_pin * sizeof(*maps),
+				GFP_KERNEL);
+	if (!maps)
+		return -ENOMEM;
+
+	for (i = 0; i < num_pins; i++) {
+		err = of_property_read_u32_index(np, "brcm,pins", i, &pin);
+		if (err)
+			goto out;
+		if (pin >= ARRAY_SIZE(bcm2835_gpio_pins)) {
+			dev_err(pc->dev, "%s: invalid brcm,pins value %d\n",
+				of_node_full_name(np), pin);
+			err = -EINVAL;
+			goto out;
+		}
+
+		if (num_funcs) {
+			err = of_property_read_u32_index(np, "brcm,function",
+					(num_funcs > 1) ? i : 0, &func);
+			if (err)
+				goto out;
+			err = bcm2835_pctl_dt_node_to_map_func(pc, np, pin,
+							func, &cur_map);
+			if (err)
+				goto out;
+		}
+		if (num_pulls) {
+			err = of_property_read_u32_index(np, "brcm,pull",
+					(num_funcs > 1) ? i : 0, &pull);
+			if (err)
+				goto out;
+			err = bcm2835_pctl_dt_node_to_map_pull(pc, np, pin,
+							pull, &cur_map);
+			if (err)
+				goto out;
+		}
+	}
+
+	*map = maps;
+	*num_maps = num_pins * maps_per_pin;
+
+	return 0;
+
+out:
+	kfree(maps);
+	return err;
+}
+
+static const struct pinctrl_ops bcm2835_pctl_ops = {
+	.get_groups_count = bcm2835_pctl_get_groups_count,
+	.get_group_name = bcm2835_pctl_get_group_name,
+	.get_group_pins = bcm2835_pctl_get_group_pins,
+	.pin_dbg_show = bcm2835_pctl_pin_dbg_show,
+	.dt_node_to_map = bcm2835_pctl_dt_node_to_map,
+	.dt_free_map = bcm2835_pctl_dt_free_map,
+};
+
+static int bcm2835_pmx_get_functions_count(struct pinctrl_dev *pctldev)
+{
+	return BCM2835_FSEL_COUNT;
+}
+
+static const char *bcm2835_pmx_get_function_name(struct pinctrl_dev *pctldev,
+		unsigned selector)
+{
+	return bcm2835_functions[selector];
+}
+
+static int bcm2835_pmx_get_function_groups(struct pinctrl_dev *pctldev,
+		unsigned selector,
+		const char * const **groups,
+		unsigned * const num_groups)
+{
+	/* every pin can do every function */
+	*groups = bcm2835_gpio_groups;
+	*num_groups = ARRAY_SIZE(bcm2835_gpio_groups);
+
+	return 0;
+}
+
+static int bcm2835_pmx_set(struct pinctrl_dev *pctldev,
+		unsigned func_selector,
+		unsigned group_selector)
+{
+	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
+
+	bcm2835_pinctrl_fsel_set(pc, group_selector, func_selector);
+
+	return 0;
+}
+
+static void bcm2835_pmx_gpio_disable_free(struct pinctrl_dev *pctldev,
+		struct pinctrl_gpio_range *range,
+		unsigned offset)
+{
+	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
+
+	/* disable by setting to GPIO_IN */
+	bcm2835_pinctrl_fsel_set(pc, offset, BCM2835_FSEL_GPIO_IN);
+}
+
+static int bcm2835_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
+		struct pinctrl_gpio_range *range,
+		unsigned offset,
+		bool input)
+{
+	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
+	enum bcm2835_fsel fsel = input ?
+		BCM2835_FSEL_GPIO_IN : BCM2835_FSEL_GPIO_OUT;
+
+	bcm2835_pinctrl_fsel_set(pc, offset, fsel);
+
+	return 0;
+}
+
+static const struct pinmux_ops bcm2835_pmx_ops = {
+	.get_functions_count = bcm2835_pmx_get_functions_count,
+	.get_function_name = bcm2835_pmx_get_function_name,
+	.get_function_groups = bcm2835_pmx_get_function_groups,
+	.set_mux = bcm2835_pmx_set,
+	.gpio_disable_free = bcm2835_pmx_gpio_disable_free,
+	.gpio_set_direction = bcm2835_pmx_gpio_set_direction,
+};
+
+static int bcm2835_pinconf_get(struct pinctrl_dev *pctldev,
+			unsigned pin, unsigned long *config)
+{
+	/* No way to read back config in HW */
+	return -ENOTSUPP;
+}
+
+static int bcm2835_pinconf_set(struct pinctrl_dev *pctldev,
+			unsigned pin, unsigned long *configs,
+			unsigned num_configs)
+{
+	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
+	enum bcm2835_pinconf_param param;
+	u16 arg;
+	u32 off, bit;
+	int i;
+
+	for (i = 0; i < num_configs; i++) {
+		param = BCM2835_PINCONF_UNPACK_PARAM(configs[i]);
+		arg = BCM2835_PINCONF_UNPACK_ARG(configs[i]);
+
+		if (param != BCM2835_PINCONF_PARAM_PULL)
+			return -EINVAL;
+
+		off = GPIO_REG_OFFSET(pin);
+		bit = GPIO_REG_SHIFT(pin);
+
+		bcm2835_gpio_wr(pc, GPPUD, arg & 3);
+		/*
+		 * Docs say to wait 150 cycles, but not of what. We assume a
+		 * 1 MHz clock here, which is pretty slow...
+		 */
+		udelay(150);
+		bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), BIT(bit));
+		udelay(150);
+		bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), 0);
+	} /* for each config */
+
+	return 0;
+}
+
+static const struct pinconf_ops bcm2835_pinconf_ops = {
+	.pin_config_get = bcm2835_pinconf_get,
+	.pin_config_set = bcm2835_pinconf_set,
+};
+
+static struct pinctrl_desc bcm2835_pinctrl_desc = {
+	.name = MODULE_NAME,
+	.pins = bcm2835_gpio_pins,
+	.npins = ARRAY_SIZE(bcm2835_gpio_pins),
+	.pctlops = &bcm2835_pctl_ops,
+	.pmxops = &bcm2835_pmx_ops,
+	.confops = &bcm2835_pinconf_ops,
+	.owner = THIS_MODULE,
+};
+
+static struct pinctrl_gpio_range bcm2835_pinctrl_gpio_range = {
+	.name = MODULE_NAME,
+	.npins = BCM2835_NUM_GPIOS,
+};
+
+static int bcm2835_pinctrl_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct bcm2835_pinctrl *pc;
+	struct resource iomem;
+	int err, i;
+	BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_pins) != BCM2835_NUM_GPIOS);
+	BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_groups) != BCM2835_NUM_GPIOS);
+
+	pc = devm_kzalloc(dev, sizeof(*pc), GFP_KERNEL);
+	if (!pc)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, pc);
+	pc->dev = dev;
+
+	err = of_address_to_resource(np, 0, &iomem);
+	if (err) {
+		dev_err(dev, "could not get IO memory\n");
+		return err;
+	}
+
+	pc->base = devm_ioremap_resource(dev, &iomem);
+	if (IS_ERR(pc->base))
+		return PTR_ERR(pc->base);
+
+	pc->gpio_chip = bcm2835_gpio_chip;
+	pc->gpio_chip.dev = dev;
+	pc->gpio_chip.of_node = np;
+
+	pc->irq_domain = irq_domain_add_linear(np, BCM2835_NUM_GPIOS,
+			&irq_domain_simple_ops, NULL);
+	if (!pc->irq_domain) {
+		dev_err(dev, "could not create IRQ domain\n");
+		return -ENOMEM;
+	}
+
+	for (i = 0; i < BCM2835_NUM_GPIOS; i++) {
+		int irq = irq_create_mapping(pc->irq_domain, i);
+		irq_set_lockdep_class(irq, &gpio_lock_class);
+		irq_set_chip_and_handler(irq, &bcm2835_gpio_irq_chip,
+				handle_simple_irq);
+		irq_set_chip_data(irq, pc);
+		set_irq_flags(irq, IRQF_VALID);
+	}
+
+	for (i = 0; i < BCM2835_NUM_BANKS; i++) {
+		unsigned long events;
+		unsigned offset;
+		int len;
+		char *name;
+
+		/* clear event detection flags */
+		bcm2835_gpio_wr(pc, GPREN0 + i * 4, 0);
+		bcm2835_gpio_wr(pc, GPFEN0 + i * 4, 0);
+		bcm2835_gpio_wr(pc, GPHEN0 + i * 4, 0);
+		bcm2835_gpio_wr(pc, GPLEN0 + i * 4, 0);
+		bcm2835_gpio_wr(pc, GPAREN0 + i * 4, 0);
+		bcm2835_gpio_wr(pc, GPAFEN0 + i * 4, 0);
+
+		/* clear all the events */
+		events = bcm2835_gpio_rd(pc, GPEDS0 + i * 4);
+		for_each_set_bit(offset, &events, 32)
+			bcm2835_gpio_wr(pc, GPEDS0 + i * 4, BIT(offset));
+
+		pc->irq[i] = irq_of_parse_and_map(np, i);
+		pc->irq_data[i].pc = pc;
+		pc->irq_data[i].bank = i;
+		spin_lock_init(&pc->irq_lock[i]);
+
+		len = strlen(dev_name(pc->dev)) + 16;
+		name = devm_kzalloc(pc->dev, len, GFP_KERNEL);
+		if (!name)
+			return -ENOMEM;
+		snprintf(name, len, "%s:bank%d", dev_name(pc->dev), i);
+
+		err = devm_request_irq(dev, pc->irq[i],
+			bcm2835_gpio_irq_handler, IRQF_SHARED,
+			name, &pc->irq_data[i]);
+		if (err) {
+			dev_err(dev, "unable to request IRQ %d\n", pc->irq[i]);
+			return err;
+		}
+	}
+
+	err = gpiochip_add(&pc->gpio_chip);
+	if (err) {
+		dev_err(dev, "could not add GPIO chip\n");
+		return err;
+	}
+
+	pc->pctl_dev = pinctrl_register(&bcm2835_pinctrl_desc, dev, pc);
+	if (!pc->pctl_dev) {
+		gpiochip_remove(&pc->gpio_chip);
+		return -EINVAL;
+	}
+
+	pc->gpio_range = bcm2835_pinctrl_gpio_range;
+	pc->gpio_range.base = pc->gpio_chip.base;
+	pc->gpio_range.gc = &pc->gpio_chip;
+	pinctrl_add_gpio_range(pc->pctl_dev, &pc->gpio_range);
+
+	return 0;
+}
+
+static int bcm2835_pinctrl_remove(struct platform_device *pdev)
+{
+	struct bcm2835_pinctrl *pc = platform_get_drvdata(pdev);
+
+	pinctrl_unregister(pc->pctl_dev);
+	gpiochip_remove(&pc->gpio_chip);
+
+	return 0;
+}
+
+static struct of_device_id bcm2835_pinctrl_match[] = {
+	{ .compatible = "brcm,bcm2835-gpio" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, bcm2835_pinctrl_match);
+
+static struct platform_driver bcm2835_pinctrl_driver = {
+	.probe = bcm2835_pinctrl_probe,
+	.remove = bcm2835_pinctrl_remove,
+	.driver = {
+		.name = MODULE_NAME,
+		.of_match_table = bcm2835_pinctrl_match,
+	},
+};
+module_platform_driver(bcm2835_pinctrl_driver);
+
+MODULE_AUTHOR("Chris Boot, Simon Arlott, Stephen Warren");
+MODULE_DESCRIPTION("BCM2835 Pin control driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/pinctrl/pinctrl-bcm281xx.c b/drivers/pinctrl/pinctrl-bcm281xx.c
deleted file mode 100644
index fa2a00f..0000000
--- a/drivers/pinctrl/pinctrl-bcm281xx.c
+++ /dev/null
@@ -1,1455 +0,0 @@
-/*
- * Copyright (C) 2013 Broadcom Corporation
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation version 2.
- *
- * This program is distributed "as is" WITHOUT ANY WARRANTY of any
- * kind, whether express or implied; without even the implied warranty
- * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
-#include <linux/err.h>
-#include <linux/io.h>
-#include <linux/module.h>
-#include <linux/of.h>
-#include <linux/platform_device.h>
-#include <linux/pinctrl/pinctrl.h>
-#include <linux/pinctrl/pinmux.h>
-#include <linux/pinctrl/pinconf.h>
-#include <linux/pinctrl/pinconf-generic.h>
-#include <linux/regmap.h>
-#include <linux/slab.h>
-#include "core.h"
-#include "pinctrl-utils.h"
-
-/* BCM281XX Pin Control Registers Definitions */
-
-/* Function Select bits are the same for all pin control registers */
-#define BCM281XX_PIN_REG_F_SEL_MASK		0x0700
-#define BCM281XX_PIN_REG_F_SEL_SHIFT		8
-
-/* Standard pin register */
-#define BCM281XX_STD_PIN_REG_DRV_STR_MASK	0x0007
-#define BCM281XX_STD_PIN_REG_DRV_STR_SHIFT	0
-#define BCM281XX_STD_PIN_REG_INPUT_DIS_MASK	0x0008
-#define BCM281XX_STD_PIN_REG_INPUT_DIS_SHIFT	3
-#define BCM281XX_STD_PIN_REG_SLEW_MASK		0x0010
-#define BCM281XX_STD_PIN_REG_SLEW_SHIFT		4
-#define BCM281XX_STD_PIN_REG_PULL_UP_MASK	0x0020
-#define BCM281XX_STD_PIN_REG_PULL_UP_SHIFT	5
-#define BCM281XX_STD_PIN_REG_PULL_DN_MASK	0x0040
-#define BCM281XX_STD_PIN_REG_PULL_DN_SHIFT	6
-#define BCM281XX_STD_PIN_REG_HYST_MASK		0x0080
-#define BCM281XX_STD_PIN_REG_HYST_SHIFT		7
-
-/* I2C pin register */
-#define BCM281XX_I2C_PIN_REG_INPUT_DIS_MASK	0x0004
-#define BCM281XX_I2C_PIN_REG_INPUT_DIS_SHIFT	2
-#define BCM281XX_I2C_PIN_REG_SLEW_MASK		0x0008
-#define BCM281XX_I2C_PIN_REG_SLEW_SHIFT		3
-#define BCM281XX_I2C_PIN_REG_PULL_UP_STR_MASK	0x0070
-#define BCM281XX_I2C_PIN_REG_PULL_UP_STR_SHIFT	4
-
-/* HDMI pin register */
-#define BCM281XX_HDMI_PIN_REG_INPUT_DIS_MASK	0x0008
-#define BCM281XX_HDMI_PIN_REG_INPUT_DIS_SHIFT	3
-#define BCM281XX_HDMI_PIN_REG_MODE_MASK		0x0010
-#define BCM281XX_HDMI_PIN_REG_MODE_SHIFT	4
-
-/**
- * bcm281xx_pin_type - types of pin register
- */
-enum bcm281xx_pin_type {
-	BCM281XX_PIN_TYPE_UNKNOWN = 0,
-	BCM281XX_PIN_TYPE_STD,
-	BCM281XX_PIN_TYPE_I2C,
-	BCM281XX_PIN_TYPE_HDMI,
-};
-
-static enum bcm281xx_pin_type std_pin = BCM281XX_PIN_TYPE_STD;
-static enum bcm281xx_pin_type i2c_pin = BCM281XX_PIN_TYPE_I2C;
-static enum bcm281xx_pin_type hdmi_pin = BCM281XX_PIN_TYPE_HDMI;
-
-/**
- * bcm281xx_pin_function- define pin function
- */
-struct bcm281xx_pin_function {
-	const char *name;
-	const char * const *groups;
-	const unsigned ngroups;
-};
-
-/**
- * bcm281xx_pinctrl_data - Broadcom-specific pinctrl data
- * @reg_base - base of pinctrl registers
- */
-struct bcm281xx_pinctrl_data {
-	void __iomem *reg_base;
-
-	/* List of all pins */
-	const struct pinctrl_pin_desc *pins;
-	const unsigned npins;
-
-	const struct bcm281xx_pin_function *functions;
-	const unsigned nfunctions;
-
-	struct regmap *regmap;
-};
-
-/*
- * Pin number definition.  The order here must be the same as defined in the
- * PADCTRLREG block in the RDB.
- */
-#define BCM281XX_PIN_ADCSYNC		0
-#define BCM281XX_PIN_BAT_RM		1
-#define BCM281XX_PIN_BSC1_SCL		2
-#define BCM281XX_PIN_BSC1_SDA		3
-#define BCM281XX_PIN_BSC2_SCL		4
-#define BCM281XX_PIN_BSC2_SDA		5
-#define BCM281XX_PIN_CLASSGPWR		6
-#define BCM281XX_PIN_CLK_CX8		7
-#define BCM281XX_PIN_CLKOUT_0		8
-#define BCM281XX_PIN_CLKOUT_1		9
-#define BCM281XX_PIN_CLKOUT_2		10
-#define BCM281XX_PIN_CLKOUT_3		11
-#define BCM281XX_PIN_CLKREQ_IN_0	12
-#define BCM281XX_PIN_CLKREQ_IN_1	13
-#define BCM281XX_PIN_CWS_SYS_REQ1	14
-#define BCM281XX_PIN_CWS_SYS_REQ2	15
-#define BCM281XX_PIN_CWS_SYS_REQ3	16
-#define BCM281XX_PIN_DIGMIC1_CLK	17
-#define BCM281XX_PIN_DIGMIC1_DQ		18
-#define BCM281XX_PIN_DIGMIC2_CLK	19
-#define BCM281XX_PIN_DIGMIC2_DQ		20
-#define BCM281XX_PIN_GPEN13		21
-#define BCM281XX_PIN_GPEN14		22
-#define BCM281XX_PIN_GPEN15		23
-#define BCM281XX_PIN_GPIO00		24
-#define BCM281XX_PIN_GPIO01		25
-#define BCM281XX_PIN_GPIO02		26
-#define BCM281XX_PIN_GPIO03		27
-#define BCM281XX_PIN_GPIO04		28
-#define BCM281XX_PIN_GPIO05		29
-#define BCM281XX_PIN_GPIO06		30
-#define BCM281XX_PIN_GPIO07		31
-#define BCM281XX_PIN_GPIO08		32
-#define BCM281XX_PIN_GPIO09		33
-#define BCM281XX_PIN_GPIO10		34
-#define BCM281XX_PIN_GPIO11		35
-#define BCM281XX_PIN_GPIO12		36
-#define BCM281XX_PIN_GPIO13		37
-#define BCM281XX_PIN_GPIO14		38
-#define BCM281XX_PIN_GPS_PABLANK	39
-#define BCM281XX_PIN_GPS_TMARK		40
-#define BCM281XX_PIN_HDMI_SCL		41
-#define BCM281XX_PIN_HDMI_SDA		42
-#define BCM281XX_PIN_IC_DM		43
-#define BCM281XX_PIN_IC_DP		44
-#define BCM281XX_PIN_KP_COL_IP_0	45
-#define BCM281XX_PIN_KP_COL_IP_1	46
-#define BCM281XX_PIN_KP_COL_IP_2	47
-#define BCM281XX_PIN_KP_COL_IP_3	48
-#define BCM281XX_PIN_KP_ROW_OP_0	49
-#define BCM281XX_PIN_KP_ROW_OP_1	50
-#define BCM281XX_PIN_KP_ROW_OP_2	51
-#define BCM281XX_PIN_KP_ROW_OP_3	52
-#define BCM281XX_PIN_LCD_B_0		53
-#define BCM281XX_PIN_LCD_B_1		54
-#define BCM281XX_PIN_LCD_B_2		55
-#define BCM281XX_PIN_LCD_B_3		56
-#define BCM281XX_PIN_LCD_B_4		57
-#define BCM281XX_PIN_LCD_B_5		58
-#define BCM281XX_PIN_LCD_B_6		59
-#define BCM281XX_PIN_LCD_B_7		60
-#define BCM281XX_PIN_LCD_G_0		61
-#define BCM281XX_PIN_LCD_G_1		62
-#define BCM281XX_PIN_LCD_G_2		63
-#define BCM281XX_PIN_LCD_G_3		64
-#define BCM281XX_PIN_LCD_G_4		65
-#define BCM281XX_PIN_LCD_G_5		66
-#define BCM281XX_PIN_LCD_G_6		67
-#define BCM281XX_PIN_LCD_G_7		68
-#define BCM281XX_PIN_LCD_HSYNC		69
-#define BCM281XX_PIN_LCD_OE		70
-#define BCM281XX_PIN_LCD_PCLK		71
-#define BCM281XX_PIN_LCD_R_0		72
-#define BCM281XX_PIN_LCD_R_1		73
-#define BCM281XX_PIN_LCD_R_2		74
-#define BCM281XX_PIN_LCD_R_3		75
-#define BCM281XX_PIN_LCD_R_4		76
-#define BCM281XX_PIN_LCD_R_5		77
-#define BCM281XX_PIN_LCD_R_6		78
-#define BCM281XX_PIN_LCD_R_7		79
-#define BCM281XX_PIN_LCD_VSYNC		80
-#define BCM281XX_PIN_MDMGPIO0		81
-#define BCM281XX_PIN_MDMGPIO1		82
-#define BCM281XX_PIN_MDMGPIO2		83
-#define BCM281XX_PIN_MDMGPIO3		84
-#define BCM281XX_PIN_MDMGPIO4		85
-#define BCM281XX_PIN_MDMGPIO5		86
-#define BCM281XX_PIN_MDMGPIO6		87
-#define BCM281XX_PIN_MDMGPIO7		88
-#define BCM281XX_PIN_MDMGPIO8		89
-#define BCM281XX_PIN_MPHI_DATA_0	90
-#define BCM281XX_PIN_MPHI_DATA_1	91
-#define BCM281XX_PIN_MPHI_DATA_2	92
-#define BCM281XX_PIN_MPHI_DATA_3	93
-#define BCM281XX_PIN_MPHI_DATA_4	94
-#define BCM281XX_PIN_MPHI_DATA_5	95
-#define BCM281XX_PIN_MPHI_DATA_6	96
-#define BCM281XX_PIN_MPHI_DATA_7	97
-#define BCM281XX_PIN_MPHI_DATA_8	98
-#define BCM281XX_PIN_MPHI_DATA_9	99
-#define BCM281XX_PIN_MPHI_DATA_10	100
-#define BCM281XX_PIN_MPHI_DATA_11	101
-#define BCM281XX_PIN_MPHI_DATA_12	102
-#define BCM281XX_PIN_MPHI_DATA_13	103
-#define BCM281XX_PIN_MPHI_DATA_14	104
-#define BCM281XX_PIN_MPHI_DATA_15	105
-#define BCM281XX_PIN_MPHI_HA0		106
-#define BCM281XX_PIN_MPHI_HAT0		107
-#define BCM281XX_PIN_MPHI_HAT1		108
-#define BCM281XX_PIN_MPHI_HCE0_N	109
-#define BCM281XX_PIN_MPHI_HCE1_N	110
-#define BCM281XX_PIN_MPHI_HRD_N		111
-#define BCM281XX_PIN_MPHI_HWR_N		112
-#define BCM281XX_PIN_MPHI_RUN0		113
-#define BCM281XX_PIN_MPHI_RUN1		114
-#define BCM281XX_PIN_MTX_SCAN_CLK	115
-#define BCM281XX_PIN_MTX_SCAN_DATA	116
-#define BCM281XX_PIN_NAND_AD_0		117
-#define BCM281XX_PIN_NAND_AD_1		118
-#define BCM281XX_PIN_NAND_AD_2		119
-#define BCM281XX_PIN_NAND_AD_3		120
-#define BCM281XX_PIN_NAND_AD_4		121
-#define BCM281XX_PIN_NAND_AD_5		122
-#define BCM281XX_PIN_NAND_AD_6		123
-#define BCM281XX_PIN_NAND_AD_7		124
-#define BCM281XX_PIN_NAND_ALE		125
-#define BCM281XX_PIN_NAND_CEN_0		126
-#define BCM281XX_PIN_NAND_CEN_1		127
-#define BCM281XX_PIN_NAND_CLE		128
-#define BCM281XX_PIN_NAND_OEN		129
-#define BCM281XX_PIN_NAND_RDY_0		130
-#define BCM281XX_PIN_NAND_RDY_1		131
-#define BCM281XX_PIN_NAND_WEN		132
-#define BCM281XX_PIN_NAND_WP		133
-#define BCM281XX_PIN_PC1		134
-#define BCM281XX_PIN_PC2		135
-#define BCM281XX_PIN_PMU_INT		136
-#define BCM281XX_PIN_PMU_SCL		137
-#define BCM281XX_PIN_PMU_SDA		138
-#define BCM281XX_PIN_RFST2G_MTSLOTEN3G	139
-#define BCM281XX_PIN_RGMII_0_RX_CTL	140
-#define BCM281XX_PIN_RGMII_0_RXC	141
-#define BCM281XX_PIN_RGMII_0_RXD_0	142
-#define BCM281XX_PIN_RGMII_0_RXD_1	143
-#define BCM281XX_PIN_RGMII_0_RXD_2	144
-#define BCM281XX_PIN_RGMII_0_RXD_3	145
-#define BCM281XX_PIN_RGMII_0_TX_CTL	146
-#define BCM281XX_PIN_RGMII_0_TXC	147
-#define BCM281XX_PIN_RGMII_0_TXD_0	148
-#define BCM281XX_PIN_RGMII_0_TXD_1	149
-#define BCM281XX_PIN_RGMII_0_TXD_2	150
-#define BCM281XX_PIN_RGMII_0_TXD_3	151
-#define BCM281XX_PIN_RGMII_1_RX_CTL	152
-#define BCM281XX_PIN_RGMII_1_RXC	153
-#define BCM281XX_PIN_RGMII_1_RXD_0	154
-#define BCM281XX_PIN_RGMII_1_RXD_1	155
-#define BCM281XX_PIN_RGMII_1_RXD_2	156
-#define BCM281XX_PIN_RGMII_1_RXD_3	157
-#define BCM281XX_PIN_RGMII_1_TX_CTL	158
-#define BCM281XX_PIN_RGMII_1_TXC	159
-#define BCM281XX_PIN_RGMII_1_TXD_0	160
-#define BCM281XX_PIN_RGMII_1_TXD_1	161
-#define BCM281XX_PIN_RGMII_1_TXD_2	162
-#define BCM281XX_PIN_RGMII_1_TXD_3	163
-#define BCM281XX_PIN_RGMII_GPIO_0	164
-#define BCM281XX_PIN_RGMII_GPIO_1	165
-#define BCM281XX_PIN_RGMII_GPIO_2	166
-#define BCM281XX_PIN_RGMII_GPIO_3	167
-#define BCM281XX_PIN_RTXDATA2G_TXDATA3G1	168
-#define BCM281XX_PIN_RTXEN2G_TXDATA3G2	169
-#define BCM281XX_PIN_RXDATA3G0		170
-#define BCM281XX_PIN_RXDATA3G1		171
-#define BCM281XX_PIN_RXDATA3G2		172
-#define BCM281XX_PIN_SDIO1_CLK		173
-#define BCM281XX_PIN_SDIO1_CMD		174
-#define BCM281XX_PIN_SDIO1_DATA_0	175
-#define BCM281XX_PIN_SDIO1_DATA_1	176
-#define BCM281XX_PIN_SDIO1_DATA_2	177
-#define BCM281XX_PIN_SDIO1_DATA_3	178
-#define BCM281XX_PIN_SDIO4_CLK		179
-#define BCM281XX_PIN_SDIO4_CMD		180
-#define BCM281XX_PIN_SDIO4_DATA_0	181
-#define BCM281XX_PIN_SDIO4_DATA_1	182
-#define BCM281XX_PIN_SDIO4_DATA_2	183
-#define BCM281XX_PIN_SDIO4_DATA_3	184
-#define BCM281XX_PIN_SIM_CLK		185
-#define BCM281XX_PIN_SIM_DATA		186
-#define BCM281XX_PIN_SIM_DET		187
-#define BCM281XX_PIN_SIM_RESETN		188
-#define BCM281XX_PIN_SIM2_CLK		189
-#define BCM281XX_PIN_SIM2_DATA		190
-#define BCM281XX_PIN_SIM2_DET		191
-#define BCM281XX_PIN_SIM2_RESETN	192
-#define BCM281XX_PIN_SRI_C		193
-#define BCM281XX_PIN_SRI_D		194
-#define BCM281XX_PIN_SRI_E		195
-#define BCM281XX_PIN_SSP_EXTCLK		196
-#define BCM281XX_PIN_SSP0_CLK		197
-#define BCM281XX_PIN_SSP0_FS		198
-#define BCM281XX_PIN_SSP0_RXD		199
-#define BCM281XX_PIN_SSP0_TXD		200
-#define BCM281XX_PIN_SSP2_CLK		201
-#define BCM281XX_PIN_SSP2_FS_0		202
-#define BCM281XX_PIN_SSP2_FS_1		203
-#define BCM281XX_PIN_SSP2_FS_2		204
-#define BCM281XX_PIN_SSP2_FS_3		205
-#define BCM281XX_PIN_SSP2_RXD_0		206
-#define BCM281XX_PIN_SSP2_RXD_1		207
-#define BCM281XX_PIN_SSP2_TXD_0		208
-#define BCM281XX_PIN_SSP2_TXD_1		209
-#define BCM281XX_PIN_SSP3_CLK		210
-#define BCM281XX_PIN_SSP3_FS		211
-#define BCM281XX_PIN_SSP3_RXD		212
-#define BCM281XX_PIN_SSP3_TXD		213
-#define BCM281XX_PIN_SSP4_CLK		214
-#define BCM281XX_PIN_SSP4_FS		215
-#define BCM281XX_PIN_SSP4_RXD		216
-#define BCM281XX_PIN_SSP4_TXD		217
-#define BCM281XX_PIN_SSP5_CLK		218
-#define BCM281XX_PIN_SSP5_FS		219
-#define BCM281XX_PIN_SSP5_RXD		220
-#define BCM281XX_PIN_SSP5_TXD		221
-#define BCM281XX_PIN_SSP6_CLK		222
-#define BCM281XX_PIN_SSP6_FS		223
-#define BCM281XX_PIN_SSP6_RXD		224
-#define BCM281XX_PIN_SSP6_TXD		225
-#define BCM281XX_PIN_STAT_1		226
-#define BCM281XX_PIN_STAT_2		227
-#define BCM281XX_PIN_SYSCLKEN		228
-#define BCM281XX_PIN_TRACECLK		229
-#define BCM281XX_PIN_TRACEDT00		230
-#define BCM281XX_PIN_TRACEDT01		231
-#define BCM281XX_PIN_TRACEDT02		232
-#define BCM281XX_PIN_TRACEDT03		233
-#define BCM281XX_PIN_TRACEDT04		234
-#define BCM281XX_PIN_TRACEDT05		235
-#define BCM281XX_PIN_TRACEDT06		236
-#define BCM281XX_PIN_TRACEDT07		237
-#define BCM281XX_PIN_TRACEDT08		238
-#define BCM281XX_PIN_TRACEDT09		239
-#define BCM281XX_PIN_TRACEDT10		240
-#define BCM281XX_PIN_TRACEDT11		241
-#define BCM281XX_PIN_TRACEDT12		242
-#define BCM281XX_PIN_TRACEDT13		243
-#define BCM281XX_PIN_TRACEDT14		244
-#define BCM281XX_PIN_TRACEDT15		245
-#define BCM281XX_PIN_TXDATA3G0		246
-#define BCM281XX_PIN_TXPWRIND		247
-#define BCM281XX_PIN_UARTB1_UCTS	248
-#define BCM281XX_PIN_UARTB1_URTS	249
-#define BCM281XX_PIN_UARTB1_URXD	250
-#define BCM281XX_PIN_UARTB1_UTXD	251
-#define BCM281XX_PIN_UARTB2_URXD	252
-#define BCM281XX_PIN_UARTB2_UTXD	253
-#define BCM281XX_PIN_UARTB3_UCTS	254
-#define BCM281XX_PIN_UARTB3_URTS	255
-#define BCM281XX_PIN_UARTB3_URXD	256
-#define BCM281XX_PIN_UARTB3_UTXD	257
-#define BCM281XX_PIN_UARTB4_UCTS	258
-#define BCM281XX_PIN_UARTB4_URTS	259
-#define BCM281XX_PIN_UARTB4_URXD	260
-#define BCM281XX_PIN_UARTB4_UTXD	261
-#define BCM281XX_PIN_VC_CAM1_SCL	262
-#define BCM281XX_PIN_VC_CAM1_SDA	263
-#define BCM281XX_PIN_VC_CAM2_SCL	264
-#define BCM281XX_PIN_VC_CAM2_SDA	265
-#define BCM281XX_PIN_VC_CAM3_SCL	266
-#define BCM281XX_PIN_VC_CAM3_SDA	267
-
-#define BCM281XX_PIN_DESC(a, b, c) \
-	{ .number = a, .name = b, .drv_data = &c##_pin }
-
-/*
- * Pin description definition.  The order here must be the same as defined in
- * the PADCTRLREG block in the RDB, since the pin number is used as an index
- * into this array.
- */
-static const struct pinctrl_pin_desc bcm281xx_pinctrl_pins[] = {
-	BCM281XX_PIN_DESC(BCM281XX_PIN_ADCSYNC, "adcsync", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_BAT_RM, "bat_rm", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_BSC1_SCL, "bsc1_scl", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_BSC1_SDA, "bsc1_sda", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_BSC2_SCL, "bsc2_scl", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_BSC2_SDA, "bsc2_sda", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CLASSGPWR, "classgpwr", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CLK_CX8, "clk_cx8", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKOUT_0, "clkout_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKOUT_1, "clkout_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKOUT_2, "clkout_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKOUT_3, "clkout_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKREQ_IN_0, "clkreq_in_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKREQ_IN_1, "clkreq_in_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CWS_SYS_REQ1, "cws_sys_req1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CWS_SYS_REQ2, "cws_sys_req2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CWS_SYS_REQ3, "cws_sys_req3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_DIGMIC1_CLK, "digmic1_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_DIGMIC1_DQ, "digmic1_dq", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_DIGMIC2_CLK, "digmic2_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_DIGMIC2_DQ, "digmic2_dq", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPEN13, "gpen13", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPEN14, "gpen14", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPEN15, "gpen15", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO00, "gpio00", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO01, "gpio01", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO02, "gpio02", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO03, "gpio03", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO04, "gpio04", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO05, "gpio05", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO06, "gpio06", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO07, "gpio07", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO08, "gpio08", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO09, "gpio09", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO10, "gpio10", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO11, "gpio11", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO12, "gpio12", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO13, "gpio13", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO14, "gpio14", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPS_PABLANK, "gps_pablank", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPS_TMARK, "gps_tmark", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_HDMI_SCL, "hdmi_scl", hdmi),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_HDMI_SDA, "hdmi_sda", hdmi),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_IC_DM, "ic_dm", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_IC_DP, "ic_dp", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_COL_IP_0, "kp_col_ip_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_COL_IP_1, "kp_col_ip_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_COL_IP_2, "kp_col_ip_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_COL_IP_3, "kp_col_ip_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_ROW_OP_0, "kp_row_op_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_ROW_OP_1, "kp_row_op_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_ROW_OP_2, "kp_row_op_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_ROW_OP_3, "kp_row_op_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_0, "lcd_b_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_1, "lcd_b_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_2, "lcd_b_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_3, "lcd_b_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_4, "lcd_b_4", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_5, "lcd_b_5", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_6, "lcd_b_6", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_7, "lcd_b_7", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_0, "lcd_g_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_1, "lcd_g_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_2, "lcd_g_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_3, "lcd_g_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_4, "lcd_g_4", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_5, "lcd_g_5", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_6, "lcd_g_6", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_7, "lcd_g_7", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_HSYNC, "lcd_hsync", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_OE, "lcd_oe", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_PCLK, "lcd_pclk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_0, "lcd_r_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_1, "lcd_r_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_2, "lcd_r_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_3, "lcd_r_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_4, "lcd_r_4", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_5, "lcd_r_5", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_6, "lcd_r_6", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_7, "lcd_r_7", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_VSYNC, "lcd_vsync", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO0, "mdmgpio0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO1, "mdmgpio1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO2, "mdmgpio2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO3, "mdmgpio3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO4, "mdmgpio4", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO5, "mdmgpio5", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO6, "mdmgpio6", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO7, "mdmgpio7", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO8, "mdmgpio8", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_0, "mphi_data_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_1, "mphi_data_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_2, "mphi_data_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_3, "mphi_data_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_4, "mphi_data_4", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_5, "mphi_data_5", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_6, "mphi_data_6", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_7, "mphi_data_7", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_8, "mphi_data_8", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_9, "mphi_data_9", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_10, "mphi_data_10", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_11, "mphi_data_11", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_12, "mphi_data_12", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_13, "mphi_data_13", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_14, "mphi_data_14", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_15, "mphi_data_15", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HA0, "mphi_ha0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HAT0, "mphi_hat0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HAT1, "mphi_hat1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HCE0_N, "mphi_hce0_n", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HCE1_N, "mphi_hce1_n", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HRD_N, "mphi_hrd_n", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HWR_N, "mphi_hwr_n", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_RUN0, "mphi_run0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_RUN1, "mphi_run1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MTX_SCAN_CLK, "mtx_scan_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MTX_SCAN_DATA, "mtx_scan_data", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_0, "nand_ad_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_1, "nand_ad_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_2, "nand_ad_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_3, "nand_ad_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_4, "nand_ad_4", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_5, "nand_ad_5", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_6, "nand_ad_6", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_7, "nand_ad_7", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_ALE, "nand_ale", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_CEN_0, "nand_cen_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_CEN_1, "nand_cen_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_CLE, "nand_cle", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_OEN, "nand_oen", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_RDY_0, "nand_rdy_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_RDY_1, "nand_rdy_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_WEN, "nand_wen", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_WP, "nand_wp", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_PC1, "pc1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_PC2, "pc2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_PMU_INT, "pmu_int", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_PMU_SCL, "pmu_scl", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_PMU_SDA, "pmu_sda", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RFST2G_MTSLOTEN3G, "rfst2g_mtsloten3g",
-		std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RX_CTL, "rgmii_0_rx_ctl", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXC, "rgmii_0_rxc", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXD_0, "rgmii_0_rxd_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXD_1, "rgmii_0_rxd_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXD_2, "rgmii_0_rxd_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXD_3, "rgmii_0_rxd_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TX_CTL, "rgmii_0_tx_ctl", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXC, "rgmii_0_txc", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXD_0, "rgmii_0_txd_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXD_1, "rgmii_0_txd_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXD_2, "rgmii_0_txd_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXD_3, "rgmii_0_txd_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RX_CTL, "rgmii_1_rx_ctl", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXC, "rgmii_1_rxc", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXD_0, "rgmii_1_rxd_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXD_1, "rgmii_1_rxd_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXD_2, "rgmii_1_rxd_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXD_3, "rgmii_1_rxd_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TX_CTL, "rgmii_1_tx_ctl", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXC, "rgmii_1_txc", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXD_0, "rgmii_1_txd_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXD_1, "rgmii_1_txd_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXD_2, "rgmii_1_txd_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXD_3, "rgmii_1_txd_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_GPIO_0, "rgmii_gpio_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_GPIO_1, "rgmii_gpio_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_GPIO_2, "rgmii_gpio_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_GPIO_3, "rgmii_gpio_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RTXDATA2G_TXDATA3G1,
-		"rtxdata2g_txdata3g1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RTXEN2G_TXDATA3G2, "rtxen2g_txdata3g2",
-		std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RXDATA3G0, "rxdata3g0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RXDATA3G1, "rxdata3g1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RXDATA3G2, "rxdata3g2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_CLK, "sdio1_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_CMD, "sdio1_cmd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_DATA_0, "sdio1_data_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_DATA_1, "sdio1_data_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_DATA_2, "sdio1_data_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_DATA_3, "sdio1_data_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_CLK, "sdio4_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_CMD, "sdio4_cmd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_DATA_0, "sdio4_data_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_DATA_1, "sdio4_data_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_DATA_2, "sdio4_data_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_DATA_3, "sdio4_data_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM_CLK, "sim_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM_DATA, "sim_data", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM_DET, "sim_det", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM_RESETN, "sim_resetn", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM2_CLK, "sim2_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM2_DATA, "sim2_data", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM2_DET, "sim2_det", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM2_RESETN, "sim2_resetn", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SRI_C, "sri_c", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SRI_D, "sri_d", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SRI_E, "sri_e", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP_EXTCLK, "ssp_extclk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP0_CLK, "ssp0_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP0_FS, "ssp0_fs", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP0_RXD, "ssp0_rxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP0_TXD, "ssp0_txd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_CLK, "ssp2_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_FS_0, "ssp2_fs_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_FS_1, "ssp2_fs_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_FS_2, "ssp2_fs_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_FS_3, "ssp2_fs_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_RXD_0, "ssp2_rxd_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_RXD_1, "ssp2_rxd_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_TXD_0, "ssp2_txd_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_TXD_1, "ssp2_txd_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP3_CLK, "ssp3_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP3_FS, "ssp3_fs", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP3_RXD, "ssp3_rxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP3_TXD, "ssp3_txd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP4_CLK, "ssp4_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP4_FS, "ssp4_fs", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP4_RXD, "ssp4_rxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP4_TXD, "ssp4_txd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP5_CLK, "ssp5_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP5_FS, "ssp5_fs", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP5_RXD, "ssp5_rxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP5_TXD, "ssp5_txd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP6_CLK, "ssp6_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP6_FS, "ssp6_fs", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP6_RXD, "ssp6_rxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP6_TXD, "ssp6_txd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_STAT_1, "stat_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_STAT_2, "stat_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SYSCLKEN, "sysclken", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACECLK, "traceclk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT00, "tracedt00", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT01, "tracedt01", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT02, "tracedt02", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT03, "tracedt03", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT04, "tracedt04", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT05, "tracedt05", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT06, "tracedt06", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT07, "tracedt07", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT08, "tracedt08", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT09, "tracedt09", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT10, "tracedt10", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT11, "tracedt11", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT12, "tracedt12", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT13, "tracedt13", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT14, "tracedt14", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT15, "tracedt15", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TXDATA3G0, "txdata3g0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TXPWRIND, "txpwrind", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB1_UCTS, "uartb1_ucts", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB1_URTS, "uartb1_urts", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB1_URXD, "uartb1_urxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB1_UTXD, "uartb1_utxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB2_URXD, "uartb2_urxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB2_UTXD, "uartb2_utxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB3_UCTS, "uartb3_ucts", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB3_URTS, "uartb3_urts", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB3_URXD, "uartb3_urxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB3_UTXD, "uartb3_utxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB4_UCTS, "uartb4_ucts", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB4_URTS, "uartb4_urts", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB4_URXD, "uartb4_urxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB4_UTXD, "uartb4_utxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM1_SCL, "vc_cam1_scl", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM1_SDA, "vc_cam1_sda", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM2_SCL, "vc_cam2_scl", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM2_SDA, "vc_cam2_sda", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM3_SCL, "vc_cam3_scl", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM3_SDA, "vc_cam3_sda", i2c),
-};
-
-static const char * const bcm281xx_alt_groups[] = {
-	"adcsync",
-	"bat_rm",
-	"bsc1_scl",
-	"bsc1_sda",
-	"bsc2_scl",
-	"bsc2_sda",
-	"classgpwr",
-	"clk_cx8",
-	"clkout_0",
-	"clkout_1",
-	"clkout_2",
-	"clkout_3",
-	"clkreq_in_0",
-	"clkreq_in_1",
-	"cws_sys_req1",
-	"cws_sys_req2",
-	"cws_sys_req3",
-	"digmic1_clk",
-	"digmic1_dq",
-	"digmic2_clk",
-	"digmic2_dq",
-	"gpen13",
-	"gpen14",
-	"gpen15",
-	"gpio00",
-	"gpio01",
-	"gpio02",
-	"gpio03",
-	"gpio04",
-	"gpio05",
-	"gpio06",
-	"gpio07",
-	"gpio08",
-	"gpio09",
-	"gpio10",
-	"gpio11",
-	"gpio12",
-	"gpio13",
-	"gpio14",
-	"gps_pablank",
-	"gps_tmark",
-	"hdmi_scl",
-	"hdmi_sda",
-	"ic_dm",
-	"ic_dp",
-	"kp_col_ip_0",
-	"kp_col_ip_1",
-	"kp_col_ip_2",
-	"kp_col_ip_3",
-	"kp_row_op_0",
-	"kp_row_op_1",
-	"kp_row_op_2",
-	"kp_row_op_3",
-	"lcd_b_0",
-	"lcd_b_1",
-	"lcd_b_2",
-	"lcd_b_3",
-	"lcd_b_4",
-	"lcd_b_5",
-	"lcd_b_6",
-	"lcd_b_7",
-	"lcd_g_0",
-	"lcd_g_1",
-	"lcd_g_2",
-	"lcd_g_3",
-	"lcd_g_4",
-	"lcd_g_5",
-	"lcd_g_6",
-	"lcd_g_7",
-	"lcd_hsync",
-	"lcd_oe",
-	"lcd_pclk",
-	"lcd_r_0",
-	"lcd_r_1",
-	"lcd_r_2",
-	"lcd_r_3",
-	"lcd_r_4",
-	"lcd_r_5",
-	"lcd_r_6",
-	"lcd_r_7",
-	"lcd_vsync",
-	"mdmgpio0",
-	"mdmgpio1",
-	"mdmgpio2",
-	"mdmgpio3",
-	"mdmgpio4",
-	"mdmgpio5",
-	"mdmgpio6",
-	"mdmgpio7",
-	"mdmgpio8",
-	"mphi_data_0",
-	"mphi_data_1",
-	"mphi_data_2",
-	"mphi_data_3",
-	"mphi_data_4",
-	"mphi_data_5",
-	"mphi_data_6",
-	"mphi_data_7",
-	"mphi_data_8",
-	"mphi_data_9",
-	"mphi_data_10",
-	"mphi_data_11",
-	"mphi_data_12",
-	"mphi_data_13",
-	"mphi_data_14",
-	"mphi_data_15",
-	"mphi_ha0",
-	"mphi_hat0",
-	"mphi_hat1",
-	"mphi_hce0_n",
-	"mphi_hce1_n",
-	"mphi_hrd_n",
-	"mphi_hwr_n",
-	"mphi_run0",
-	"mphi_run1",
-	"mtx_scan_clk",
-	"mtx_scan_data",
-	"nand_ad_0",
-	"nand_ad_1",
-	"nand_ad_2",
-	"nand_ad_3",
-	"nand_ad_4",
-	"nand_ad_5",
-	"nand_ad_6",
-	"nand_ad_7",
-	"nand_ale",
-	"nand_cen_0",
-	"nand_cen_1",
-	"nand_cle",
-	"nand_oen",
-	"nand_rdy_0",
-	"nand_rdy_1",
-	"nand_wen",
-	"nand_wp",
-	"pc1",
-	"pc2",
-	"pmu_int",
-	"pmu_scl",
-	"pmu_sda",
-	"rfst2g_mtsloten3g",
-	"rgmii_0_rx_ctl",
-	"rgmii_0_rxc",
-	"rgmii_0_rxd_0",
-	"rgmii_0_rxd_1",
-	"rgmii_0_rxd_2",
-	"rgmii_0_rxd_3",
-	"rgmii_0_tx_ctl",
-	"rgmii_0_txc",
-	"rgmii_0_txd_0",
-	"rgmii_0_txd_1",
-	"rgmii_0_txd_2",
-	"rgmii_0_txd_3",
-	"rgmii_1_rx_ctl",
-	"rgmii_1_rxc",
-	"rgmii_1_rxd_0",
-	"rgmii_1_rxd_1",
-	"rgmii_1_rxd_2",
-	"rgmii_1_rxd_3",
-	"rgmii_1_tx_ctl",
-	"rgmii_1_txc",
-	"rgmii_1_txd_0",
-	"rgmii_1_txd_1",
-	"rgmii_1_txd_2",
-	"rgmii_1_txd_3",
-	"rgmii_gpio_0",
-	"rgmii_gpio_1",
-	"rgmii_gpio_2",
-	"rgmii_gpio_3",
-	"rtxdata2g_txdata3g1",
-	"rtxen2g_txdata3g2",
-	"rxdata3g0",
-	"rxdata3g1",
-	"rxdata3g2",
-	"sdio1_clk",
-	"sdio1_cmd",
-	"sdio1_data_0",
-	"sdio1_data_1",
-	"sdio1_data_2",
-	"sdio1_data_3",
-	"sdio4_clk",
-	"sdio4_cmd",
-	"sdio4_data_0",
-	"sdio4_data_1",
-	"sdio4_data_2",
-	"sdio4_data_3",
-	"sim_clk",
-	"sim_data",
-	"sim_det",
-	"sim_resetn",
-	"sim2_clk",
-	"sim2_data",
-	"sim2_det",
-	"sim2_resetn",
-	"sri_c",
-	"sri_d",
-	"sri_e",
-	"ssp_extclk",
-	"ssp0_clk",
-	"ssp0_fs",
-	"ssp0_rxd",
-	"ssp0_txd",
-	"ssp2_clk",
-	"ssp2_fs_0",
-	"ssp2_fs_1",
-	"ssp2_fs_2",
-	"ssp2_fs_3",
-	"ssp2_rxd_0",
-	"ssp2_rxd_1",
-	"ssp2_txd_0",
-	"ssp2_txd_1",
-	"ssp3_clk",
-	"ssp3_fs",
-	"ssp3_rxd",
-	"ssp3_txd",
-	"ssp4_clk",
-	"ssp4_fs",
-	"ssp4_rxd",
-	"ssp4_txd",
-	"ssp5_clk",
-	"ssp5_fs",
-	"ssp5_rxd",
-	"ssp5_txd",
-	"ssp6_clk",
-	"ssp6_fs",
-	"ssp6_rxd",
-	"ssp6_txd",
-	"stat_1",
-	"stat_2",
-	"sysclken",
-	"traceclk",
-	"tracedt00",
-	"tracedt01",
-	"tracedt02",
-	"tracedt03",
-	"tracedt04",
-	"tracedt05",
-	"tracedt06",
-	"tracedt07",
-	"tracedt08",
-	"tracedt09",
-	"tracedt10",
-	"tracedt11",
-	"tracedt12",
-	"tracedt13",
-	"tracedt14",
-	"tracedt15",
-	"txdata3g0",
-	"txpwrind",
-	"uartb1_ucts",
-	"uartb1_urts",
-	"uartb1_urxd",
-	"uartb1_utxd",
-	"uartb2_urxd",
-	"uartb2_utxd",
-	"uartb3_ucts",
-	"uartb3_urts",
-	"uartb3_urxd",
-	"uartb3_utxd",
-	"uartb4_ucts",
-	"uartb4_urts",
-	"uartb4_urxd",
-	"uartb4_utxd",
-	"vc_cam1_scl",
-	"vc_cam1_sda",
-	"vc_cam2_scl",
-	"vc_cam2_sda",
-	"vc_cam3_scl",
-	"vc_cam3_sda",
-};
-
-/* Every pin can implement all ALT1-ALT4 functions */
-#define BCM281XX_PIN_FUNCTION(fcn_name)			\
-{							\
-	.name = #fcn_name,				\
-	.groups = bcm281xx_alt_groups,			\
-	.ngroups = ARRAY_SIZE(bcm281xx_alt_groups),	\
-}
-
-static const struct bcm281xx_pin_function bcm281xx_functions[] = {
-	BCM281XX_PIN_FUNCTION(alt1),
-	BCM281XX_PIN_FUNCTION(alt2),
-	BCM281XX_PIN_FUNCTION(alt3),
-	BCM281XX_PIN_FUNCTION(alt4),
-};
-
-static struct bcm281xx_pinctrl_data bcm281xx_pinctrl = {
-	.pins = bcm281xx_pinctrl_pins,
-	.npins = ARRAY_SIZE(bcm281xx_pinctrl_pins),
-	.functions = bcm281xx_functions,
-	.nfunctions = ARRAY_SIZE(bcm281xx_functions),
-};
-
-static inline enum bcm281xx_pin_type pin_type_get(struct pinctrl_dev *pctldev,
-						  unsigned pin)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-
-	if (pin >= pdata->npins)
-		return BCM281XX_PIN_TYPE_UNKNOWN;
-
-	return *(enum bcm281xx_pin_type *)(pdata->pins[pin].drv_data);
-}
-
-#define BCM281XX_PIN_SHIFT(type, param) \
-	(BCM281XX_ ## type ## _PIN_REG_ ## param ## _SHIFT)
-
-#define BCM281XX_PIN_MASK(type, param) \
-	(BCM281XX_ ## type ## _PIN_REG_ ## param ## _MASK)
-
-/*
- * This helper function is used to build up the value and mask used to write to
- * a pin register, but does not actually write to the register.
- */
-static inline void bcm281xx_pin_update(u32 *reg_val, u32 *reg_mask,
-				       u32 param_val, u32 param_shift,
-				       u32 param_mask)
-{
-	*reg_val &= ~param_mask;
-	*reg_val |= (param_val << param_shift) & param_mask;
-	*reg_mask |= param_mask;
-}
-
-static struct regmap_config bcm281xx_pinctrl_regmap_config = {
-	.reg_bits = 32,
-	.reg_stride = 4,
-	.val_bits = 32,
-	.max_register = BCM281XX_PIN_VC_CAM3_SDA,
-};
-
-static int bcm281xx_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-
-	return pdata->npins;
-}
-
-static const char *bcm281xx_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
-						   unsigned group)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-
-	return pdata->pins[group].name;
-}
-
-static int bcm281xx_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
-					   unsigned group,
-					   const unsigned **pins,
-					   unsigned *num_pins)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-
-	*pins = &pdata->pins[group].number;
-	*num_pins = 1;
-
-	return 0;
-}
-
-static void bcm281xx_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
-					  struct seq_file *s,
-					  unsigned offset)
-{
-	seq_printf(s, " %s", dev_name(pctldev->dev));
-}
-
-static struct pinctrl_ops bcm281xx_pinctrl_ops = {
-	.get_groups_count = bcm281xx_pinctrl_get_groups_count,
-	.get_group_name = bcm281xx_pinctrl_get_group_name,
-	.get_group_pins = bcm281xx_pinctrl_get_group_pins,
-	.pin_dbg_show = bcm281xx_pinctrl_pin_dbg_show,
-	.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
-	.dt_free_map = pinctrl_utils_dt_free_map,
-};
-
-static int bcm281xx_pinctrl_get_fcns_count(struct pinctrl_dev *pctldev)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-
-	return pdata->nfunctions;
-}
-
-static const char *bcm281xx_pinctrl_get_fcn_name(struct pinctrl_dev *pctldev,
-						 unsigned function)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-
-	return pdata->functions[function].name;
-}
-
-static int bcm281xx_pinctrl_get_fcn_groups(struct pinctrl_dev *pctldev,
-					   unsigned function,
-					   const char * const **groups,
-					   unsigned * const num_groups)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-
-	*groups = pdata->functions[function].groups;
-	*num_groups = pdata->functions[function].ngroups;
-
-	return 0;
-}
-
-static int bcm281xx_pinmux_set(struct pinctrl_dev *pctldev,
-			       unsigned function,
-			       unsigned group)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-	const struct bcm281xx_pin_function *f = &pdata->functions[function];
-	u32 offset = 4 * pdata->pins[group].number;
-	int rc = 0;
-
-	dev_dbg(pctldev->dev,
-		"%s(): Enable function %s (%d) of pin %s (%d) @offset 0x%x.\n",
-		__func__, f->name, function, pdata->pins[group].name,
-		pdata->pins[group].number, offset);
-
-	rc = regmap_update_bits(pdata->regmap, offset,
-		BCM281XX_PIN_REG_F_SEL_MASK,
-		function << BCM281XX_PIN_REG_F_SEL_SHIFT);
-	if (rc)
-		dev_err(pctldev->dev,
-			"Error updating register for pin %s (%d).\n",
-			pdata->pins[group].name, pdata->pins[group].number);
-
-	return rc;
-}
-
-static struct pinmux_ops bcm281xx_pinctrl_pinmux_ops = {
-	.get_functions_count = bcm281xx_pinctrl_get_fcns_count,
-	.get_function_name = bcm281xx_pinctrl_get_fcn_name,
-	.get_function_groups = bcm281xx_pinctrl_get_fcn_groups,
-	.set_mux = bcm281xx_pinmux_set,
-};
-
-static int bcm281xx_pinctrl_pin_config_get(struct pinctrl_dev *pctldev,
-					   unsigned pin,
-					   unsigned long *config)
-{
-	return -ENOTSUPP;
-}
-
-
-/* Goes through the configs and update register val/mask */
-static int bcm281xx_std_pin_update(struct pinctrl_dev *pctldev,
-				   unsigned pin,
-				   unsigned long *configs,
-				   unsigned num_configs,
-				   u32 *val,
-				   u32 *mask)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-	int i;
-	enum pin_config_param param;
-	u16 arg;
-
-	for (i = 0; i < num_configs; i++) {
-		param = pinconf_to_config_param(configs[i]);
-		arg = pinconf_to_config_argument(configs[i]);
-
-		switch (param) {
-		case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
-			arg = (arg >= 1 ? 1 : 0);
-			bcm281xx_pin_update(val, mask, arg,
-				BCM281XX_PIN_SHIFT(STD, HYST),
-				BCM281XX_PIN_MASK(STD, HYST));
-			break;
-		/*
-		 * The pin bias can only be one of pull-up, pull-down, or
-		 * disable.  The user does not need to specify a value for the
-		 * property, and the default value from pinconf-generic is
-		 * ignored.
-		 */
-		case PIN_CONFIG_BIAS_DISABLE:
-			bcm281xx_pin_update(val, mask, 0,
-				BCM281XX_PIN_SHIFT(STD, PULL_UP),
-				BCM281XX_PIN_MASK(STD, PULL_UP));
-			bcm281xx_pin_update(val, mask, 0,
-				BCM281XX_PIN_SHIFT(STD, PULL_DN),
-				BCM281XX_PIN_MASK(STD, PULL_DN));
-			break;
-
-		case PIN_CONFIG_BIAS_PULL_UP:
-			bcm281xx_pin_update(val, mask, 1,
-				BCM281XX_PIN_SHIFT(STD, PULL_UP),
-				BCM281XX_PIN_MASK(STD, PULL_UP));
-			bcm281xx_pin_update(val, mask, 0,
-				BCM281XX_PIN_SHIFT(STD, PULL_DN),
-				BCM281XX_PIN_MASK(STD, PULL_DN));
-			break;
-
-		case PIN_CONFIG_BIAS_PULL_DOWN:
-			bcm281xx_pin_update(val, mask, 0,
-				BCM281XX_PIN_SHIFT(STD, PULL_UP),
-				BCM281XX_PIN_MASK(STD, PULL_UP));
-			bcm281xx_pin_update(val, mask, 1,
-				BCM281XX_PIN_SHIFT(STD, PULL_DN),
-				BCM281XX_PIN_MASK(STD, PULL_DN));
-			break;
-
-		case PIN_CONFIG_SLEW_RATE:
-			arg = (arg >= 1 ? 1 : 0);
-			bcm281xx_pin_update(val, mask, arg,
-				BCM281XX_PIN_SHIFT(STD, SLEW),
-				BCM281XX_PIN_MASK(STD, SLEW));
-			break;
-
-		case PIN_CONFIG_INPUT_ENABLE:
-			/* inversed since register is for input _disable_ */
-			arg = (arg >= 1 ? 0 : 1);
-			bcm281xx_pin_update(val, mask, arg,
-				BCM281XX_PIN_SHIFT(STD, INPUT_DIS),
-				BCM281XX_PIN_MASK(STD, INPUT_DIS));
-			break;
-
-		case PIN_CONFIG_DRIVE_STRENGTH:
-			/* Valid range is 2-16 mA, even numbers only */
-			if ((arg < 2) || (arg > 16) || (arg % 2)) {
-				dev_err(pctldev->dev,
-					"Invalid Drive Strength value (%d) for "
-					"pin %s (%d). Valid values are "
-					"(2..16) mA, even numbers only.\n",
-					arg, pdata->pins[pin].name, pin);
-				return -EINVAL;
-			}
-			bcm281xx_pin_update(val, mask, (arg/2)-1,
-				BCM281XX_PIN_SHIFT(STD, DRV_STR),
-				BCM281XX_PIN_MASK(STD, DRV_STR));
-			break;
-
-		default:
-			dev_err(pctldev->dev,
-				"Unrecognized pin config %d for pin %s (%d).\n",
-				param, pdata->pins[pin].name, pin);
-			return -EINVAL;
-
-		} /* switch config */
-	} /* for each config */
-
-	return 0;
-}
-
-/*
- * The pull-up strength for an I2C pin is represented by bits 4-6 in the
- * register with the following mapping:
- *   0b000: No pull-up
- *   0b001: 1200 Ohm
- *   0b010: 1800 Ohm
- *   0b011: 720 Ohm
- *   0b100: 2700 Ohm
- *   0b101: 831 Ohm
- *   0b110: 1080 Ohm
- *   0b111: 568 Ohm
- * This array maps pull-up strength in Ohms to register values (1+index).
- */
-static const u16 bcm281xx_pullup_map[] = {
-	1200, 1800, 720, 2700, 831, 1080, 568
-};
-
-/* Goes through the configs and update register val/mask */
-static int bcm281xx_i2c_pin_update(struct pinctrl_dev *pctldev,
-				   unsigned pin,
-				   unsigned long *configs,
-				   unsigned num_configs,
-				   u32 *val,
-				   u32 *mask)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-	int i, j;
-	enum pin_config_param param;
-	u16 arg;
-
-	for (i = 0; i < num_configs; i++) {
-		param = pinconf_to_config_param(configs[i]);
-		arg = pinconf_to_config_argument(configs[i]);
-
-		switch (param) {
-		case PIN_CONFIG_BIAS_PULL_UP:
-			for (j = 0; j < ARRAY_SIZE(bcm281xx_pullup_map); j++)
-				if (bcm281xx_pullup_map[j] == arg)
-					break;
-
-			if (j == ARRAY_SIZE(bcm281xx_pullup_map)) {
-				dev_err(pctldev->dev,
-					"Invalid pull-up value (%d) for pin %s "
-					"(%d). Valid values are 568, 720, 831, "
-					"1080, 1200, 1800, 2700 Ohms.\n",
-					arg, pdata->pins[pin].name, pin);
-				return -EINVAL;
-			}
-
-			bcm281xx_pin_update(val, mask, j+1,
-				BCM281XX_PIN_SHIFT(I2C, PULL_UP_STR),
-				BCM281XX_PIN_MASK(I2C, PULL_UP_STR));
-			break;
-
-		case PIN_CONFIG_BIAS_DISABLE:
-			bcm281xx_pin_update(val, mask, 0,
-				BCM281XX_PIN_SHIFT(I2C, PULL_UP_STR),
-				BCM281XX_PIN_MASK(I2C, PULL_UP_STR));
-			break;
-
-		case PIN_CONFIG_SLEW_RATE:
-			arg = (arg >= 1 ? 1 : 0);
-			bcm281xx_pin_update(val, mask, arg,
-				BCM281XX_PIN_SHIFT(I2C, SLEW),
-				BCM281XX_PIN_MASK(I2C, SLEW));
-			break;
-
-		case PIN_CONFIG_INPUT_ENABLE:
-			/* inversed since register is for input _disable_ */
-			arg = (arg >= 1 ? 0 : 1);
-			bcm281xx_pin_update(val, mask, arg,
-				BCM281XX_PIN_SHIFT(I2C, INPUT_DIS),
-				BCM281XX_PIN_MASK(I2C, INPUT_DIS));
-			break;
-
-		default:
-			dev_err(pctldev->dev,
-				"Unrecognized pin config %d for pin %s (%d).\n",
-				param, pdata->pins[pin].name, pin);
-			return -EINVAL;
-
-		} /* switch config */
-	} /* for each config */
-
-	return 0;
-}
-
-/* Goes through the configs and update register val/mask */
-static int bcm281xx_hdmi_pin_update(struct pinctrl_dev *pctldev,
-				    unsigned pin,
-				    unsigned long *configs,
-				    unsigned num_configs,
-				    u32 *val,
-				    u32 *mask)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-	int i;
-	enum pin_config_param param;
-	u16 arg;
-
-	for (i = 0; i < num_configs; i++) {
-		param = pinconf_to_config_param(configs[i]);
-		arg = pinconf_to_config_argument(configs[i]);
-
-		switch (param) {
-		case PIN_CONFIG_SLEW_RATE:
-			arg = (arg >= 1 ? 1 : 0);
-			bcm281xx_pin_update(val, mask, arg,
-				BCM281XX_PIN_SHIFT(HDMI, MODE),
-				BCM281XX_PIN_MASK(HDMI, MODE));
-			break;
-
-		case PIN_CONFIG_INPUT_ENABLE:
-			/* inversed since register is for input _disable_ */
-			arg = (arg >= 1 ? 0 : 1);
-			bcm281xx_pin_update(val, mask, arg,
-				BCM281XX_PIN_SHIFT(HDMI, INPUT_DIS),
-				BCM281XX_PIN_MASK(HDMI, INPUT_DIS));
-			break;
-
-		default:
-			dev_err(pctldev->dev,
-				"Unrecognized pin config %d for pin %s (%d).\n",
-				param, pdata->pins[pin].name, pin);
-			return -EINVAL;
-
-		} /* switch config */
-	} /* for each config */
-
-	return 0;
-}
-
-static int bcm281xx_pinctrl_pin_config_set(struct pinctrl_dev *pctldev,
-					   unsigned pin,
-					   unsigned long *configs,
-					   unsigned num_configs)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-	enum bcm281xx_pin_type pin_type;
-	u32 offset = 4 * pin;
-	u32 cfg_val, cfg_mask;
-	int rc;
-
-	cfg_val = 0;
-	cfg_mask = 0;
-	pin_type = pin_type_get(pctldev, pin);
-
-	/* Different pins have different configuration options */
-	switch (pin_type) {
-	case BCM281XX_PIN_TYPE_STD:
-		rc = bcm281xx_std_pin_update(pctldev, pin, configs,
-			num_configs, &cfg_val, &cfg_mask);
-		break;
-
-	case BCM281XX_PIN_TYPE_I2C:
-		rc = bcm281xx_i2c_pin_update(pctldev, pin, configs,
-			num_configs, &cfg_val, &cfg_mask);
-		break;
-
-	case BCM281XX_PIN_TYPE_HDMI:
-		rc = bcm281xx_hdmi_pin_update(pctldev, pin, configs,
-			num_configs, &cfg_val, &cfg_mask);
-		break;
-
-	default:
-		dev_err(pctldev->dev, "Unknown pin type for pin %s (%d).\n",
-			pdata->pins[pin].name, pin);
-		return -EINVAL;
-
-	} /* switch pin type */
-
-	if (rc)
-		return rc;
-
-	dev_dbg(pctldev->dev,
-		"%s(): Set pin %s (%d) with config 0x%x, mask 0x%x\n",
-		__func__, pdata->pins[pin].name, pin, cfg_val, cfg_mask);
-
-	rc = regmap_update_bits(pdata->regmap, offset, cfg_mask, cfg_val);
-	if (rc) {
-		dev_err(pctldev->dev,
-			"Error updating register for pin %s (%d).\n",
-			pdata->pins[pin].name, pin);
-		return rc;
-	}
-
-	return 0;
-}
-
-static struct pinconf_ops bcm281xx_pinctrl_pinconf_ops = {
-	.pin_config_get = bcm281xx_pinctrl_pin_config_get,
-	.pin_config_set = bcm281xx_pinctrl_pin_config_set,
-};
-
-static struct pinctrl_desc bcm281xx_pinctrl_desc = {
-	/* name, pins, npins members initialized in probe function */
-	.pctlops = &bcm281xx_pinctrl_ops,
-	.pmxops = &bcm281xx_pinctrl_pinmux_ops,
-	.confops = &bcm281xx_pinctrl_pinconf_ops,
-	.owner = THIS_MODULE,
-};
-
-static int __init bcm281xx_pinctrl_probe(struct platform_device *pdev)
-{
-	struct bcm281xx_pinctrl_data *pdata = &bcm281xx_pinctrl;
-	struct resource *res;
-	struct pinctrl_dev *pctl;
-
-	/* So far We can assume there is only 1 bank of registers */
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	pdata->reg_base = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(pdata->reg_base)) {
-		dev_err(&pdev->dev, "Failed to ioremap MEM resource\n");
-		return -ENODEV;
-	}
-
-	/* Initialize the dynamic part of pinctrl_desc */
-	pdata->regmap = devm_regmap_init_mmio(&pdev->dev, pdata->reg_base,
-		&bcm281xx_pinctrl_regmap_config);
-	if (IS_ERR(pdata->regmap)) {
-		dev_err(&pdev->dev, "Regmap MMIO init failed.\n");
-		return -ENODEV;
-	}
-
-	bcm281xx_pinctrl_desc.name = dev_name(&pdev->dev);
-	bcm281xx_pinctrl_desc.pins = bcm281xx_pinctrl.pins;
-	bcm281xx_pinctrl_desc.npins = bcm281xx_pinctrl.npins;
-
-	pctl = pinctrl_register(&bcm281xx_pinctrl_desc,
-				&pdev->dev,
-				pdata);
-	if (!pctl) {
-		dev_err(&pdev->dev, "Failed to register pinctrl\n");
-		return -ENODEV;
-	}
-
-	platform_set_drvdata(pdev, pdata);
-
-	return 0;
-}
-
-static struct of_device_id bcm281xx_pinctrl_of_match[] = {
-	{ .compatible = "brcm,bcm11351-pinctrl", },
-	{ },
-};
-
-static struct platform_driver bcm281xx_pinctrl_driver = {
-	.driver = {
-		.name = "bcm281xx-pinctrl",
-		.of_match_table = bcm281xx_pinctrl_of_match,
-	},
-};
-
-module_platform_driver_probe(bcm281xx_pinctrl_driver, bcm281xx_pinctrl_probe);
-
-MODULE_AUTHOR("Broadcom Corporation <bcm-kernel-feedback-list@broadcom.com>");
-MODULE_AUTHOR("Sherman Yin <syin@broadcom.com>");
-MODULE_DESCRIPTION("Broadcom BCM281xx pinctrl driver");
-MODULE_LICENSE("GPL v2");
diff --git a/drivers/pinctrl/pinctrl-bcm2835.c b/drivers/pinctrl/pinctrl-bcm2835.c
deleted file mode 100644
index 9aa8a3f..0000000
--- a/drivers/pinctrl/pinctrl-bcm2835.c
+++ /dev/null
@@ -1,1072 +0,0 @@
-/*
- * Driver for Broadcom BCM2835 GPIO unit (pinctrl + GPIO)
- *
- * Copyright (C) 2012 Chris Boot, Simon Arlott, Stephen Warren
- *
- * This driver is inspired by:
- * pinctrl-nomadik.c, please see original file for copyright information
- * pinctrl-tegra.c, please see original file for copyright information
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
-
-#include <linux/bitmap.h>
-#include <linux/bug.h>
-#include <linux/delay.h>
-#include <linux/device.h>
-#include <linux/err.h>
-#include <linux/gpio.h>
-#include <linux/interrupt.h>
-#include <linux/io.h>
-#include <linux/irq.h>
-#include <linux/irqdesc.h>
-#include <linux/irqdomain.h>
-#include <linux/module.h>
-#include <linux/of_address.h>
-#include <linux/of.h>
-#include <linux/of_irq.h>
-#include <linux/pinctrl/consumer.h>
-#include <linux/pinctrl/machine.h>
-#include <linux/pinctrl/pinconf.h>
-#include <linux/pinctrl/pinctrl.h>
-#include <linux/pinctrl/pinmux.h>
-#include <linux/platform_device.h>
-#include <linux/seq_file.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
-#include <linux/types.h>
-
-#define MODULE_NAME "pinctrl-bcm2835"
-#define BCM2835_NUM_GPIOS 54
-#define BCM2835_NUM_BANKS 2
-
-#define BCM2835_PIN_BITMAP_SZ \
-	DIV_ROUND_UP(BCM2835_NUM_GPIOS, sizeof(unsigned long) * 8)
-
-/* GPIO register offsets */
-#define GPFSEL0		0x0	/* Function Select */
-#define GPSET0		0x1c	/* Pin Output Set */
-#define GPCLR0		0x28	/* Pin Output Clear */
-#define GPLEV0		0x34	/* Pin Level */
-#define GPEDS0		0x40	/* Pin Event Detect Status */
-#define GPREN0		0x4c	/* Pin Rising Edge Detect Enable */
-#define GPFEN0		0x58	/* Pin Falling Edge Detect Enable */
-#define GPHEN0		0x64	/* Pin High Detect Enable */
-#define GPLEN0		0x70	/* Pin Low Detect Enable */
-#define GPAREN0		0x7c	/* Pin Async Rising Edge Detect */
-#define GPAFEN0		0x88	/* Pin Async Falling Edge Detect */
-#define GPPUD		0x94	/* Pin Pull-up/down Enable */
-#define GPPUDCLK0	0x98	/* Pin Pull-up/down Enable Clock */
-
-#define FSEL_REG(p)		(GPFSEL0 + (((p) / 10) * 4))
-#define FSEL_SHIFT(p)		(((p) % 10) * 3)
-#define GPIO_REG_OFFSET(p)	((p) / 32)
-#define GPIO_REG_SHIFT(p)	((p) % 32)
-
-enum bcm2835_pinconf_param {
-	/* argument: bcm2835_pinconf_pull */
-	BCM2835_PINCONF_PARAM_PULL,
-};
-
-enum bcm2835_pinconf_pull {
-	BCM2835_PINCONFIG_PULL_NONE,
-	BCM2835_PINCONFIG_PULL_DOWN,
-	BCM2835_PINCONFIG_PULL_UP,
-};
-
-#define BCM2835_PINCONF_PACK(_param_, _arg_) ((_param_) << 16 | (_arg_))
-#define BCM2835_PINCONF_UNPACK_PARAM(_conf_) ((_conf_) >> 16)
-#define BCM2835_PINCONF_UNPACK_ARG(_conf_) ((_conf_) & 0xffff)
-
-struct bcm2835_gpio_irqdata {
-	struct bcm2835_pinctrl *pc;
-	int bank;
-};
-
-struct bcm2835_pinctrl {
-	struct device *dev;
-	void __iomem *base;
-	int irq[BCM2835_NUM_BANKS];
-
-	/* note: locking assumes each bank will have its own unsigned long */
-	unsigned long enabled_irq_map[BCM2835_NUM_BANKS];
-	unsigned int irq_type[BCM2835_NUM_GPIOS];
-
-	struct pinctrl_dev *pctl_dev;
-	struct irq_domain *irq_domain;
-	struct gpio_chip gpio_chip;
-	struct pinctrl_gpio_range gpio_range;
-
-	struct bcm2835_gpio_irqdata irq_data[BCM2835_NUM_BANKS];
-	spinlock_t irq_lock[BCM2835_NUM_BANKS];
-};
-
-static struct lock_class_key gpio_lock_class;
-
-/* pins are just named GPIO0..GPIO53 */
-#define BCM2835_GPIO_PIN(a) PINCTRL_PIN(a, "gpio" #a)
-static struct pinctrl_pin_desc bcm2835_gpio_pins[] = {
-	BCM2835_GPIO_PIN(0),
-	BCM2835_GPIO_PIN(1),
-	BCM2835_GPIO_PIN(2),
-	BCM2835_GPIO_PIN(3),
-	BCM2835_GPIO_PIN(4),
-	BCM2835_GPIO_PIN(5),
-	BCM2835_GPIO_PIN(6),
-	BCM2835_GPIO_PIN(7),
-	BCM2835_GPIO_PIN(8),
-	BCM2835_GPIO_PIN(9),
-	BCM2835_GPIO_PIN(10),
-	BCM2835_GPIO_PIN(11),
-	BCM2835_GPIO_PIN(12),
-	BCM2835_GPIO_PIN(13),
-	BCM2835_GPIO_PIN(14),
-	BCM2835_GPIO_PIN(15),
-	BCM2835_GPIO_PIN(16),
-	BCM2835_GPIO_PIN(17),
-	BCM2835_GPIO_PIN(18),
-	BCM2835_GPIO_PIN(19),
-	BCM2835_GPIO_PIN(20),
-	BCM2835_GPIO_PIN(21),
-	BCM2835_GPIO_PIN(22),
-	BCM2835_GPIO_PIN(23),
-	BCM2835_GPIO_PIN(24),
-	BCM2835_GPIO_PIN(25),
-	BCM2835_GPIO_PIN(26),
-	BCM2835_GPIO_PIN(27),
-	BCM2835_GPIO_PIN(28),
-	BCM2835_GPIO_PIN(29),
-	BCM2835_GPIO_PIN(30),
-	BCM2835_GPIO_PIN(31),
-	BCM2835_GPIO_PIN(32),
-	BCM2835_GPIO_PIN(33),
-	BCM2835_GPIO_PIN(34),
-	BCM2835_GPIO_PIN(35),
-	BCM2835_GPIO_PIN(36),
-	BCM2835_GPIO_PIN(37),
-	BCM2835_GPIO_PIN(38),
-	BCM2835_GPIO_PIN(39),
-	BCM2835_GPIO_PIN(40),
-	BCM2835_GPIO_PIN(41),
-	BCM2835_GPIO_PIN(42),
-	BCM2835_GPIO_PIN(43),
-	BCM2835_GPIO_PIN(44),
-	BCM2835_GPIO_PIN(45),
-	BCM2835_GPIO_PIN(46),
-	BCM2835_GPIO_PIN(47),
-	BCM2835_GPIO_PIN(48),
-	BCM2835_GPIO_PIN(49),
-	BCM2835_GPIO_PIN(50),
-	BCM2835_GPIO_PIN(51),
-	BCM2835_GPIO_PIN(52),
-	BCM2835_GPIO_PIN(53),
-};
-
-/* one pin per group */
-static const char * const bcm2835_gpio_groups[] = {
-	"gpio0",
-	"gpio1",
-	"gpio2",
-	"gpio3",
-	"gpio4",
-	"gpio5",
-	"gpio6",
-	"gpio7",
-	"gpio8",
-	"gpio9",
-	"gpio10",
-	"gpio11",
-	"gpio12",
-	"gpio13",
-	"gpio14",
-	"gpio15",
-	"gpio16",
-	"gpio17",
-	"gpio18",
-	"gpio19",
-	"gpio20",
-	"gpio21",
-	"gpio22",
-	"gpio23",
-	"gpio24",
-	"gpio25",
-	"gpio26",
-	"gpio27",
-	"gpio28",
-	"gpio29",
-	"gpio30",
-	"gpio31",
-	"gpio32",
-	"gpio33",
-	"gpio34",
-	"gpio35",
-	"gpio36",
-	"gpio37",
-	"gpio38",
-	"gpio39",
-	"gpio40",
-	"gpio41",
-	"gpio42",
-	"gpio43",
-	"gpio44",
-	"gpio45",
-	"gpio46",
-	"gpio47",
-	"gpio48",
-	"gpio49",
-	"gpio50",
-	"gpio51",
-	"gpio52",
-	"gpio53",
-};
-
-enum bcm2835_fsel {
-	BCM2835_FSEL_GPIO_IN = 0,
-	BCM2835_FSEL_GPIO_OUT = 1,
-	BCM2835_FSEL_ALT0 = 4,
-	BCM2835_FSEL_ALT1 = 5,
-	BCM2835_FSEL_ALT2 = 6,
-	BCM2835_FSEL_ALT3 = 7,
-	BCM2835_FSEL_ALT4 = 3,
-	BCM2835_FSEL_ALT5 = 2,
-	BCM2835_FSEL_COUNT = 8,
-	BCM2835_FSEL_MASK = 0x7,
-};
-
-static const char * const bcm2835_functions[BCM2835_FSEL_COUNT] = {
-	[BCM2835_FSEL_GPIO_IN] = "gpio_in",
-	[BCM2835_FSEL_GPIO_OUT] = "gpio_out",
-	[BCM2835_FSEL_ALT0] = "alt0",
-	[BCM2835_FSEL_ALT1] = "alt1",
-	[BCM2835_FSEL_ALT2] = "alt2",
-	[BCM2835_FSEL_ALT3] = "alt3",
-	[BCM2835_FSEL_ALT4] = "alt4",
-	[BCM2835_FSEL_ALT5] = "alt5",
-};
-
-static const char * const irq_type_names[] = {
-	[IRQ_TYPE_NONE] = "none",
-	[IRQ_TYPE_EDGE_RISING] = "edge-rising",
-	[IRQ_TYPE_EDGE_FALLING] = "edge-falling",
-	[IRQ_TYPE_EDGE_BOTH] = "edge-both",
-	[IRQ_TYPE_LEVEL_HIGH] = "level-high",
-	[IRQ_TYPE_LEVEL_LOW] = "level-low",
-};
-
-static inline u32 bcm2835_gpio_rd(struct bcm2835_pinctrl *pc, unsigned reg)
-{
-	return readl(pc->base + reg);
-}
-
-static inline void bcm2835_gpio_wr(struct bcm2835_pinctrl *pc, unsigned reg,
-		u32 val)
-{
-	writel(val, pc->base + reg);
-}
-
-static inline int bcm2835_gpio_get_bit(struct bcm2835_pinctrl *pc, unsigned reg,
-		unsigned bit)
-{
-	reg += GPIO_REG_OFFSET(bit) * 4;
-	return (bcm2835_gpio_rd(pc, reg) >> GPIO_REG_SHIFT(bit)) & 1;
-}
-
-/* note NOT a read/modify/write cycle */
-static inline void bcm2835_gpio_set_bit(struct bcm2835_pinctrl *pc,
-		unsigned reg, unsigned bit)
-{
-	reg += GPIO_REG_OFFSET(bit) * 4;
-	bcm2835_gpio_wr(pc, reg, BIT(GPIO_REG_SHIFT(bit)));
-}
-
-static inline enum bcm2835_fsel bcm2835_pinctrl_fsel_get(
-		struct bcm2835_pinctrl *pc, unsigned pin)
-{
-	u32 val = bcm2835_gpio_rd(pc, FSEL_REG(pin));
-	enum bcm2835_fsel status = (val >> FSEL_SHIFT(pin)) & BCM2835_FSEL_MASK;
-
-	dev_dbg(pc->dev, "get %08x (%u => %s)\n", val, pin,
-			bcm2835_functions[status]);
-
-	return status;
-}
-
-static inline void bcm2835_pinctrl_fsel_set(
-		struct bcm2835_pinctrl *pc, unsigned pin,
-		enum bcm2835_fsel fsel)
-{
-	u32 val = bcm2835_gpio_rd(pc, FSEL_REG(pin));
-	enum bcm2835_fsel cur = (val >> FSEL_SHIFT(pin)) & BCM2835_FSEL_MASK;
-
-	dev_dbg(pc->dev, "read %08x (%u => %s)\n", val, pin,
-			bcm2835_functions[cur]);
-
-	if (cur == fsel)
-		return;
-
-	if (cur != BCM2835_FSEL_GPIO_IN && fsel != BCM2835_FSEL_GPIO_IN) {
-		/* always transition through GPIO_IN */
-		val &= ~(BCM2835_FSEL_MASK << FSEL_SHIFT(pin));
-		val |= BCM2835_FSEL_GPIO_IN << FSEL_SHIFT(pin);
-
-		dev_dbg(pc->dev, "trans %08x (%u <= %s)\n", val, pin,
-				bcm2835_functions[BCM2835_FSEL_GPIO_IN]);
-		bcm2835_gpio_wr(pc, FSEL_REG(pin), val);
-	}
-
-	val &= ~(BCM2835_FSEL_MASK << FSEL_SHIFT(pin));
-	val |= fsel << FSEL_SHIFT(pin);
-
-	dev_dbg(pc->dev, "write %08x (%u <= %s)\n", val, pin,
-			bcm2835_functions[fsel]);
-	bcm2835_gpio_wr(pc, FSEL_REG(pin), val);
-}
-
-static int bcm2835_gpio_request(struct gpio_chip *chip, unsigned offset)
-{
-	return pinctrl_request_gpio(chip->base + offset);
-}
-
-static void bcm2835_gpio_free(struct gpio_chip *chip, unsigned offset)
-{
-	pinctrl_free_gpio(chip->base + offset);
-}
-
-static int bcm2835_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
-{
-	return pinctrl_gpio_direction_input(chip->base + offset);
-}
-
-static int bcm2835_gpio_get(struct gpio_chip *chip, unsigned offset)
-{
-	struct bcm2835_pinctrl *pc = dev_get_drvdata(chip->dev);
-
-	return bcm2835_gpio_get_bit(pc, GPLEV0, offset);
-}
-
-static int bcm2835_gpio_direction_output(struct gpio_chip *chip,
-		unsigned offset, int value)
-{
-	return pinctrl_gpio_direction_output(chip->base + offset);
-}
-
-static void bcm2835_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
-{
-	struct bcm2835_pinctrl *pc = dev_get_drvdata(chip->dev);
-
-	bcm2835_gpio_set_bit(pc, value ? GPSET0 : GPCLR0, offset);
-}
-
-static int bcm2835_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
-{
-	struct bcm2835_pinctrl *pc = dev_get_drvdata(chip->dev);
-
-	return irq_linear_revmap(pc->irq_domain, offset);
-}
-
-static struct gpio_chip bcm2835_gpio_chip = {
-	.label = MODULE_NAME,
-	.owner = THIS_MODULE,
-	.request = bcm2835_gpio_request,
-	.free = bcm2835_gpio_free,
-	.direction_input = bcm2835_gpio_direction_input,
-	.direction_output = bcm2835_gpio_direction_output,
-	.get = bcm2835_gpio_get,
-	.set = bcm2835_gpio_set,
-	.to_irq = bcm2835_gpio_to_irq,
-	.base = -1,
-	.ngpio = BCM2835_NUM_GPIOS,
-	.can_sleep = false,
-};
-
-static irqreturn_t bcm2835_gpio_irq_handler(int irq, void *dev_id)
-{
-	struct bcm2835_gpio_irqdata *irqdata = dev_id;
-	struct bcm2835_pinctrl *pc = irqdata->pc;
-	int bank = irqdata->bank;
-	unsigned long events;
-	unsigned offset;
-	unsigned gpio;
-	unsigned int type;
-
-	events = bcm2835_gpio_rd(pc, GPEDS0 + bank * 4);
-	events &= pc->enabled_irq_map[bank];
-	for_each_set_bit(offset, &events, 32) {
-		gpio = (32 * bank) + offset;
-		type = pc->irq_type[gpio];
-
-		/* ack edge triggered IRQs immediately */
-		if (!(type & IRQ_TYPE_LEVEL_MASK))
-			bcm2835_gpio_set_bit(pc, GPEDS0, gpio);
-
-		generic_handle_irq(irq_linear_revmap(pc->irq_domain, gpio));
-
-		/* ack level triggered IRQ after handling them */
-		if (type & IRQ_TYPE_LEVEL_MASK)
-			bcm2835_gpio_set_bit(pc, GPEDS0, gpio);
-	}
-	return events ? IRQ_HANDLED : IRQ_NONE;
-}
-
-static inline void __bcm2835_gpio_irq_config(struct bcm2835_pinctrl *pc,
-	unsigned reg, unsigned offset, bool enable)
-{
-	u32 value;
-	reg += GPIO_REG_OFFSET(offset) * 4;
-	value = bcm2835_gpio_rd(pc, reg);
-	if (enable)
-		value |= BIT(GPIO_REG_SHIFT(offset));
-	else
-		value &= ~(BIT(GPIO_REG_SHIFT(offset)));
-	bcm2835_gpio_wr(pc, reg, value);
-}
-
-/* fast path for IRQ handler */
-static void bcm2835_gpio_irq_config(struct bcm2835_pinctrl *pc,
-	unsigned offset, bool enable)
-{
-	switch (pc->irq_type[offset]) {
-	case IRQ_TYPE_EDGE_RISING:
-		__bcm2835_gpio_irq_config(pc, GPREN0, offset, enable);
-		break;
-
-	case IRQ_TYPE_EDGE_FALLING:
-		__bcm2835_gpio_irq_config(pc, GPFEN0, offset, enable);
-		break;
-
-	case IRQ_TYPE_EDGE_BOTH:
-		__bcm2835_gpio_irq_config(pc, GPREN0, offset, enable);
-		__bcm2835_gpio_irq_config(pc, GPFEN0, offset, enable);
-		break;
-
-	case IRQ_TYPE_LEVEL_HIGH:
-		__bcm2835_gpio_irq_config(pc, GPHEN0, offset, enable);
-		break;
-
-	case IRQ_TYPE_LEVEL_LOW:
-		__bcm2835_gpio_irq_config(pc, GPLEN0, offset, enable);
-		break;
-	}
-}
-
-static void bcm2835_gpio_irq_enable(struct irq_data *data)
-{
-	struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data);
-	unsigned gpio = irqd_to_hwirq(data);
-	unsigned offset = GPIO_REG_SHIFT(gpio);
-	unsigned bank = GPIO_REG_OFFSET(gpio);
-	unsigned long flags;
-
-	spin_lock_irqsave(&pc->irq_lock[bank], flags);
-	set_bit(offset, &pc->enabled_irq_map[bank]);
-	bcm2835_gpio_irq_config(pc, gpio, true);
-	spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
-}
-
-static void bcm2835_gpio_irq_disable(struct irq_data *data)
-{
-	struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data);
-	unsigned gpio = irqd_to_hwirq(data);
-	unsigned offset = GPIO_REG_SHIFT(gpio);
-	unsigned bank = GPIO_REG_OFFSET(gpio);
-	unsigned long flags;
-
-	spin_lock_irqsave(&pc->irq_lock[bank], flags);
-	bcm2835_gpio_irq_config(pc, gpio, false);
-	clear_bit(offset, &pc->enabled_irq_map[bank]);
-	spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
-}
-
-static int __bcm2835_gpio_irq_set_type_disabled(struct bcm2835_pinctrl *pc,
-	unsigned offset, unsigned int type)
-{
-	switch (type) {
-	case IRQ_TYPE_NONE:
-	case IRQ_TYPE_EDGE_RISING:
-	case IRQ_TYPE_EDGE_FALLING:
-	case IRQ_TYPE_EDGE_BOTH:
-	case IRQ_TYPE_LEVEL_HIGH:
-	case IRQ_TYPE_LEVEL_LOW:
-		pc->irq_type[offset] = type;
-		break;
-
-	default:
-		return -EINVAL;
-	}
-	return 0;
-}
-
-/* slower path for reconfiguring IRQ type */
-static int __bcm2835_gpio_irq_set_type_enabled(struct bcm2835_pinctrl *pc,
-	unsigned offset, unsigned int type)
-{
-	switch (type) {
-	case IRQ_TYPE_NONE:
-		if (pc->irq_type[offset] != type) {
-			bcm2835_gpio_irq_config(pc, offset, false);
-			pc->irq_type[offset] = type;
-		}
-		break;
-
-	case IRQ_TYPE_EDGE_RISING:
-		if (pc->irq_type[offset] == IRQ_TYPE_EDGE_BOTH) {
-			/* RISING already enabled, disable FALLING */
-			pc->irq_type[offset] = IRQ_TYPE_EDGE_FALLING;
-			bcm2835_gpio_irq_config(pc, offset, false);
-			pc->irq_type[offset] = type;
-		} else if (pc->irq_type[offset] != type) {
-			bcm2835_gpio_irq_config(pc, offset, false);
-			pc->irq_type[offset] = type;
-			bcm2835_gpio_irq_config(pc, offset, true);
-		}
-		break;
-
-	case IRQ_TYPE_EDGE_FALLING:
-		if (pc->irq_type[offset] == IRQ_TYPE_EDGE_BOTH) {
-			/* FALLING already enabled, disable RISING */
-			pc->irq_type[offset] = IRQ_TYPE_EDGE_RISING;
-			bcm2835_gpio_irq_config(pc, offset, false);
-			pc->irq_type[offset] = type;
-		} else if (pc->irq_type[offset] != type) {
-			bcm2835_gpio_irq_config(pc, offset, false);
-			pc->irq_type[offset] = type;
-			bcm2835_gpio_irq_config(pc, offset, true);
-		}
-		break;
-
-	case IRQ_TYPE_EDGE_BOTH:
-		if (pc->irq_type[offset] == IRQ_TYPE_EDGE_RISING) {
-			/* RISING already enabled, enable FALLING too */
-			pc->irq_type[offset] = IRQ_TYPE_EDGE_FALLING;
-			bcm2835_gpio_irq_config(pc, offset, true);
-			pc->irq_type[offset] = type;
-		} else if (pc->irq_type[offset] == IRQ_TYPE_EDGE_FALLING) {
-			/* FALLING already enabled, enable RISING too */
-			pc->irq_type[offset] = IRQ_TYPE_EDGE_RISING;
-			bcm2835_gpio_irq_config(pc, offset, true);
-			pc->irq_type[offset] = type;
-		} else if (pc->irq_type[offset] != type) {
-			bcm2835_gpio_irq_config(pc, offset, false);
-			pc->irq_type[offset] = type;
-			bcm2835_gpio_irq_config(pc, offset, true);
-		}
-		break;
-
-	case IRQ_TYPE_LEVEL_HIGH:
-	case IRQ_TYPE_LEVEL_LOW:
-		if (pc->irq_type[offset] != type) {
-			bcm2835_gpio_irq_config(pc, offset, false);
-			pc->irq_type[offset] = type;
-			bcm2835_gpio_irq_config(pc, offset, true);
-		}
-		break;
-
-	default:
-		return -EINVAL;
-	}
-	return 0;
-}
-
-static int bcm2835_gpio_irq_set_type(struct irq_data *data, unsigned int type)
-{
-	struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data);
-	unsigned gpio = irqd_to_hwirq(data);
-	unsigned offset = GPIO_REG_SHIFT(gpio);
-	unsigned bank = GPIO_REG_OFFSET(gpio);
-	unsigned long flags;
-	int ret;
-
-	spin_lock_irqsave(&pc->irq_lock[bank], flags);
-
-	if (test_bit(offset, &pc->enabled_irq_map[bank]))
-		ret = __bcm2835_gpio_irq_set_type_enabled(pc, gpio, type);
-	else
-		ret = __bcm2835_gpio_irq_set_type_disabled(pc, gpio, type);
-
-	spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
-
-	return ret;
-}
-
-static struct irq_chip bcm2835_gpio_irq_chip = {
-	.name = MODULE_NAME,
-	.irq_enable = bcm2835_gpio_irq_enable,
-	.irq_disable = bcm2835_gpio_irq_disable,
-	.irq_set_type = bcm2835_gpio_irq_set_type,
-};
-
-static int bcm2835_pctl_get_groups_count(struct pinctrl_dev *pctldev)
-{
-	return ARRAY_SIZE(bcm2835_gpio_groups);
-}
-
-static const char *bcm2835_pctl_get_group_name(struct pinctrl_dev *pctldev,
-		unsigned selector)
-{
-	return bcm2835_gpio_groups[selector];
-}
-
-static int bcm2835_pctl_get_group_pins(struct pinctrl_dev *pctldev,
-		unsigned selector,
-		const unsigned **pins,
-		unsigned *num_pins)
-{
-	*pins = &bcm2835_gpio_pins[selector].number;
-	*num_pins = 1;
-
-	return 0;
-}
-
-static void bcm2835_pctl_pin_dbg_show(struct pinctrl_dev *pctldev,
-		struct seq_file *s,
-		unsigned offset)
-{
-	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
-	enum bcm2835_fsel fsel = bcm2835_pinctrl_fsel_get(pc, offset);
-	const char *fname = bcm2835_functions[fsel];
-	int value = bcm2835_gpio_get_bit(pc, GPLEV0, offset);
-	int irq = irq_find_mapping(pc->irq_domain, offset);
-
-	seq_printf(s, "function %s in %s; irq %d (%s)",
-		fname, value ? "hi" : "lo",
-		irq, irq_type_names[pc->irq_type[offset]]);
-}
-
-static void bcm2835_pctl_dt_free_map(struct pinctrl_dev *pctldev,
-		struct pinctrl_map *maps, unsigned num_maps)
-{
-	int i;
-
-	for (i = 0; i < num_maps; i++)
-		if (maps[i].type == PIN_MAP_TYPE_CONFIGS_PIN)
-			kfree(maps[i].data.configs.configs);
-
-	kfree(maps);
-}
-
-static int bcm2835_pctl_dt_node_to_map_func(struct bcm2835_pinctrl *pc,
-		struct device_node *np, u32 pin, u32 fnum,
-		struct pinctrl_map **maps)
-{
-	struct pinctrl_map *map = *maps;
-
-	if (fnum >= ARRAY_SIZE(bcm2835_functions)) {
-		dev_err(pc->dev, "%s: invalid brcm,function %d\n",
-			of_node_full_name(np), fnum);
-		return -EINVAL;
-	}
-
-	map->type = PIN_MAP_TYPE_MUX_GROUP;
-	map->data.mux.group = bcm2835_gpio_groups[pin];
-	map->data.mux.function = bcm2835_functions[fnum];
-	(*maps)++;
-
-	return 0;
-}
-
-static int bcm2835_pctl_dt_node_to_map_pull(struct bcm2835_pinctrl *pc,
-		struct device_node *np, u32 pin, u32 pull,
-		struct pinctrl_map **maps)
-{
-	struct pinctrl_map *map = *maps;
-	unsigned long *configs;
-
-	if (pull > 2) {
-		dev_err(pc->dev, "%s: invalid brcm,pull %d\n",
-			of_node_full_name(np), pull);
-		return -EINVAL;
-	}
-
-	configs = kzalloc(sizeof(*configs), GFP_KERNEL);
-	if (!configs)
-		return -ENOMEM;
-	configs[0] = BCM2835_PINCONF_PACK(BCM2835_PINCONF_PARAM_PULL, pull);
-
-	map->type = PIN_MAP_TYPE_CONFIGS_PIN;
-	map->data.configs.group_or_pin = bcm2835_gpio_pins[pin].name;
-	map->data.configs.configs = configs;
-	map->data.configs.num_configs = 1;
-	(*maps)++;
-
-	return 0;
-}
-
-static int bcm2835_pctl_dt_node_to_map(struct pinctrl_dev *pctldev,
-		struct device_node *np,
-		struct pinctrl_map **map, unsigned *num_maps)
-{
-	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
-	struct property *pins, *funcs, *pulls;
-	int num_pins, num_funcs, num_pulls, maps_per_pin;
-	struct pinctrl_map *maps, *cur_map;
-	int i, err;
-	u32 pin, func, pull;
-
-	pins = of_find_property(np, "brcm,pins", NULL);
-	if (!pins) {
-		dev_err(pc->dev, "%s: missing brcm,pins property\n",
-				of_node_full_name(np));
-		return -EINVAL;
-	}
-
-	funcs = of_find_property(np, "brcm,function", NULL);
-	pulls = of_find_property(np, "brcm,pull", NULL);
-
-	if (!funcs && !pulls) {
-		dev_err(pc->dev,
-			"%s: neither brcm,function nor brcm,pull specified\n",
-			of_node_full_name(np));
-		return -EINVAL;
-	}
-
-	num_pins = pins->length / 4;
-	num_funcs = funcs ? (funcs->length / 4) : 0;
-	num_pulls = pulls ? (pulls->length / 4) : 0;
-
-	if (num_funcs > 1 && num_funcs != num_pins) {
-		dev_err(pc->dev,
-			"%s: brcm,function must have 1 or %d entries\n",
-			of_node_full_name(np), num_pins);
-		return -EINVAL;
-	}
-
-	if (num_pulls > 1 && num_pulls != num_pins) {
-		dev_err(pc->dev,
-			"%s: brcm,pull must have 1 or %d entries\n",
-			of_node_full_name(np), num_pins);
-		return -EINVAL;
-	}
-
-	maps_per_pin = 0;
-	if (num_funcs)
-		maps_per_pin++;
-	if (num_pulls)
-		maps_per_pin++;
-	cur_map = maps = kzalloc(num_pins * maps_per_pin * sizeof(*maps),
-				GFP_KERNEL);
-	if (!maps)
-		return -ENOMEM;
-
-	for (i = 0; i < num_pins; i++) {
-		err = of_property_read_u32_index(np, "brcm,pins", i, &pin);
-		if (err)
-			goto out;
-		if (pin >= ARRAY_SIZE(bcm2835_gpio_pins)) {
-			dev_err(pc->dev, "%s: invalid brcm,pins value %d\n",
-				of_node_full_name(np), pin);
-			err = -EINVAL;
-			goto out;
-		}
-
-		if (num_funcs) {
-			err = of_property_read_u32_index(np, "brcm,function",
-					(num_funcs > 1) ? i : 0, &func);
-			if (err)
-				goto out;
-			err = bcm2835_pctl_dt_node_to_map_func(pc, np, pin,
-							func, &cur_map);
-			if (err)
-				goto out;
-		}
-		if (num_pulls) {
-			err = of_property_read_u32_index(np, "brcm,pull",
-					(num_funcs > 1) ? i : 0, &pull);
-			if (err)
-				goto out;
-			err = bcm2835_pctl_dt_node_to_map_pull(pc, np, pin,
-							pull, &cur_map);
-			if (err)
-				goto out;
-		}
-	}
-
-	*map = maps;
-	*num_maps = num_pins * maps_per_pin;
-
-	return 0;
-
-out:
-	kfree(maps);
-	return err;
-}
-
-static const struct pinctrl_ops bcm2835_pctl_ops = {
-	.get_groups_count = bcm2835_pctl_get_groups_count,
-	.get_group_name = bcm2835_pctl_get_group_name,
-	.get_group_pins = bcm2835_pctl_get_group_pins,
-	.pin_dbg_show = bcm2835_pctl_pin_dbg_show,
-	.dt_node_to_map = bcm2835_pctl_dt_node_to_map,
-	.dt_free_map = bcm2835_pctl_dt_free_map,
-};
-
-static int bcm2835_pmx_get_functions_count(struct pinctrl_dev *pctldev)
-{
-	return BCM2835_FSEL_COUNT;
-}
-
-static const char *bcm2835_pmx_get_function_name(struct pinctrl_dev *pctldev,
-		unsigned selector)
-{
-	return bcm2835_functions[selector];
-}
-
-static int bcm2835_pmx_get_function_groups(struct pinctrl_dev *pctldev,
-		unsigned selector,
-		const char * const **groups,
-		unsigned * const num_groups)
-{
-	/* every pin can do every function */
-	*groups = bcm2835_gpio_groups;
-	*num_groups = ARRAY_SIZE(bcm2835_gpio_groups);
-
-	return 0;
-}
-
-static int bcm2835_pmx_set(struct pinctrl_dev *pctldev,
-		unsigned func_selector,
-		unsigned group_selector)
-{
-	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
-
-	bcm2835_pinctrl_fsel_set(pc, group_selector, func_selector);
-
-	return 0;
-}
-
-static void bcm2835_pmx_gpio_disable_free(struct pinctrl_dev *pctldev,
-		struct pinctrl_gpio_range *range,
-		unsigned offset)
-{
-	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
-
-	/* disable by setting to GPIO_IN */
-	bcm2835_pinctrl_fsel_set(pc, offset, BCM2835_FSEL_GPIO_IN);
-}
-
-static int bcm2835_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
-		struct pinctrl_gpio_range *range,
-		unsigned offset,
-		bool input)
-{
-	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
-	enum bcm2835_fsel fsel = input ?
-		BCM2835_FSEL_GPIO_IN : BCM2835_FSEL_GPIO_OUT;
-
-	bcm2835_pinctrl_fsel_set(pc, offset, fsel);
-
-	return 0;
-}
-
-static const struct pinmux_ops bcm2835_pmx_ops = {
-	.get_functions_count = bcm2835_pmx_get_functions_count,
-	.get_function_name = bcm2835_pmx_get_function_name,
-	.get_function_groups = bcm2835_pmx_get_function_groups,
-	.set_mux = bcm2835_pmx_set,
-	.gpio_disable_free = bcm2835_pmx_gpio_disable_free,
-	.gpio_set_direction = bcm2835_pmx_gpio_set_direction,
-};
-
-static int bcm2835_pinconf_get(struct pinctrl_dev *pctldev,
-			unsigned pin, unsigned long *config)
-{
-	/* No way to read back config in HW */
-	return -ENOTSUPP;
-}
-
-static int bcm2835_pinconf_set(struct pinctrl_dev *pctldev,
-			unsigned pin, unsigned long *configs,
-			unsigned num_configs)
-{
-	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
-	enum bcm2835_pinconf_param param;
-	u16 arg;
-	u32 off, bit;
-	int i;
-
-	for (i = 0; i < num_configs; i++) {
-		param = BCM2835_PINCONF_UNPACK_PARAM(configs[i]);
-		arg = BCM2835_PINCONF_UNPACK_ARG(configs[i]);
-
-		if (param != BCM2835_PINCONF_PARAM_PULL)
-			return -EINVAL;
-
-		off = GPIO_REG_OFFSET(pin);
-		bit = GPIO_REG_SHIFT(pin);
-
-		bcm2835_gpio_wr(pc, GPPUD, arg & 3);
-		/*
-		 * Docs say to wait 150 cycles, but not of what. We assume a
-		 * 1 MHz clock here, which is pretty slow...
-		 */
-		udelay(150);
-		bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), BIT(bit));
-		udelay(150);
-		bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), 0);
-	} /* for each config */
-
-	return 0;
-}
-
-static const struct pinconf_ops bcm2835_pinconf_ops = {
-	.pin_config_get = bcm2835_pinconf_get,
-	.pin_config_set = bcm2835_pinconf_set,
-};
-
-static struct pinctrl_desc bcm2835_pinctrl_desc = {
-	.name = MODULE_NAME,
-	.pins = bcm2835_gpio_pins,
-	.npins = ARRAY_SIZE(bcm2835_gpio_pins),
-	.pctlops = &bcm2835_pctl_ops,
-	.pmxops = &bcm2835_pmx_ops,
-	.confops = &bcm2835_pinconf_ops,
-	.owner = THIS_MODULE,
-};
-
-static struct pinctrl_gpio_range bcm2835_pinctrl_gpio_range = {
-	.name = MODULE_NAME,
-	.npins = BCM2835_NUM_GPIOS,
-};
-
-static int bcm2835_pinctrl_probe(struct platform_device *pdev)
-{
-	struct device *dev = &pdev->dev;
-	struct device_node *np = dev->of_node;
-	struct bcm2835_pinctrl *pc;
-	struct resource iomem;
-	int err, i;
-	BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_pins) != BCM2835_NUM_GPIOS);
-	BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_groups) != BCM2835_NUM_GPIOS);
-
-	pc = devm_kzalloc(dev, sizeof(*pc), GFP_KERNEL);
-	if (!pc)
-		return -ENOMEM;
-
-	platform_set_drvdata(pdev, pc);
-	pc->dev = dev;
-
-	err = of_address_to_resource(np, 0, &iomem);
-	if (err) {
-		dev_err(dev, "could not get IO memory\n");
-		return err;
-	}
-
-	pc->base = devm_ioremap_resource(dev, &iomem);
-	if (IS_ERR(pc->base))
-		return PTR_ERR(pc->base);
-
-	pc->gpio_chip = bcm2835_gpio_chip;
-	pc->gpio_chip.dev = dev;
-	pc->gpio_chip.of_node = np;
-
-	pc->irq_domain = irq_domain_add_linear(np, BCM2835_NUM_GPIOS,
-			&irq_domain_simple_ops, NULL);
-	if (!pc->irq_domain) {
-		dev_err(dev, "could not create IRQ domain\n");
-		return -ENOMEM;
-	}
-
-	for (i = 0; i < BCM2835_NUM_GPIOS; i++) {
-		int irq = irq_create_mapping(pc->irq_domain, i);
-		irq_set_lockdep_class(irq, &gpio_lock_class);
-		irq_set_chip_and_handler(irq, &bcm2835_gpio_irq_chip,
-				handle_simple_irq);
-		irq_set_chip_data(irq, pc);
-		set_irq_flags(irq, IRQF_VALID);
-	}
-
-	for (i = 0; i < BCM2835_NUM_BANKS; i++) {
-		unsigned long events;
-		unsigned offset;
-		int len;
-		char *name;
-
-		/* clear event detection flags */
-		bcm2835_gpio_wr(pc, GPREN0 + i * 4, 0);
-		bcm2835_gpio_wr(pc, GPFEN0 + i * 4, 0);
-		bcm2835_gpio_wr(pc, GPHEN0 + i * 4, 0);
-		bcm2835_gpio_wr(pc, GPLEN0 + i * 4, 0);
-		bcm2835_gpio_wr(pc, GPAREN0 + i * 4, 0);
-		bcm2835_gpio_wr(pc, GPAFEN0 + i * 4, 0);
-
-		/* clear all the events */
-		events = bcm2835_gpio_rd(pc, GPEDS0 + i * 4);
-		for_each_set_bit(offset, &events, 32)
-			bcm2835_gpio_wr(pc, GPEDS0 + i * 4, BIT(offset));
-
-		pc->irq[i] = irq_of_parse_and_map(np, i);
-		pc->irq_data[i].pc = pc;
-		pc->irq_data[i].bank = i;
-		spin_lock_init(&pc->irq_lock[i]);
-
-		len = strlen(dev_name(pc->dev)) + 16;
-		name = devm_kzalloc(pc->dev, len, GFP_KERNEL);
-		if (!name)
-			return -ENOMEM;
-		snprintf(name, len, "%s:bank%d", dev_name(pc->dev), i);
-
-		err = devm_request_irq(dev, pc->irq[i],
-			bcm2835_gpio_irq_handler, IRQF_SHARED,
-			name, &pc->irq_data[i]);
-		if (err) {
-			dev_err(dev, "unable to request IRQ %d\n", pc->irq[i]);
-			return err;
-		}
-	}
-
-	err = gpiochip_add(&pc->gpio_chip);
-	if (err) {
-		dev_err(dev, "could not add GPIO chip\n");
-		return err;
-	}
-
-	pc->pctl_dev = pinctrl_register(&bcm2835_pinctrl_desc, dev, pc);
-	if (!pc->pctl_dev) {
-		gpiochip_remove(&pc->gpio_chip);
-		return -EINVAL;
-	}
-
-	pc->gpio_range = bcm2835_pinctrl_gpio_range;
-	pc->gpio_range.base = pc->gpio_chip.base;
-	pc->gpio_range.gc = &pc->gpio_chip;
-	pinctrl_add_gpio_range(pc->pctl_dev, &pc->gpio_range);
-
-	return 0;
-}
-
-static int bcm2835_pinctrl_remove(struct platform_device *pdev)
-{
-	struct bcm2835_pinctrl *pc = platform_get_drvdata(pdev);
-
-	pinctrl_unregister(pc->pctl_dev);
-	gpiochip_remove(&pc->gpio_chip);
-
-	return 0;
-}
-
-static struct of_device_id bcm2835_pinctrl_match[] = {
-	{ .compatible = "brcm,bcm2835-gpio" },
-	{}
-};
-MODULE_DEVICE_TABLE(of, bcm2835_pinctrl_match);
-
-static struct platform_driver bcm2835_pinctrl_driver = {
-	.probe = bcm2835_pinctrl_probe,
-	.remove = bcm2835_pinctrl_remove,
-	.driver = {
-		.name = MODULE_NAME,
-		.of_match_table = bcm2835_pinctrl_match,
-	},
-};
-module_platform_driver(bcm2835_pinctrl_driver);
-
-MODULE_AUTHOR("Chris Boot, Simon Arlott, Stephen Warren");
-MODULE_DESCRIPTION("BCM2835 Pin control driver");
-MODULE_LICENSE("GPL");
-- 
1.7.9.5

[PATCH v3 1/4] pinctrl: bcm: consolidate Broadcom pinctrl drivers

[Ray Jui]

Consolidate Broadcom pinctrl drivers into drivers/pinctrl/bcm/*

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 drivers/pinctrl/Kconfig                |   19 +-
 drivers/pinctrl/Makefile               |    4 +-
 drivers/pinctrl/bcm/Kconfig            |   21 +
 drivers/pinctrl/bcm/Makefile           |    4 +
 drivers/pinctrl/bcm/pinctrl-bcm281xx.c | 1455 ++++++++++++++++++++++++++++++++
 drivers/pinctrl/bcm/pinctrl-bcm2835.c  | 1072 +++++++++++++++++++++++
 drivers/pinctrl/pinctrl-bcm281xx.c     | 1455 --------------------------------
 drivers/pinctrl/pinctrl-bcm2835.c      | 1072 -----------------------
 8 files changed, 2555 insertions(+), 2547 deletions(-)
 create mode 100644 drivers/pinctrl/bcm/Kconfig
 create mode 100644 drivers/pinctrl/bcm/Makefile
 create mode 100644 drivers/pinctrl/bcm/pinctrl-bcm281xx.c
 create mode 100644 drivers/pinctrl/bcm/pinctrl-bcm2835.c
 delete mode 100644 drivers/pinctrl/pinctrl-bcm281xx.c
 delete mode 100644 drivers/pinctrl/pinctrl-bcm2835.c

diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index d014f22..6cfdad7 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -67,24 +67,6 @@ config PINCTRL_AT91
 	help
 	  Say Y here to enable the at91 pinctrl driver
 
-config PINCTRL_BCM2835
-	bool
-	select PINMUX
-	select PINCONF
-
-config PINCTRL_BCM281XX
-	bool "Broadcom BCM281xx pinctrl driver"
-	depends on OF && (ARCH_BCM_MOBILE || COMPILE_TEST)
-	select PINMUX
-	select PINCONF
-	select GENERIC_PINCONF
-	select REGMAP_MMIO
-	help
-	  Say Y here to support Broadcom BCM281xx pinctrl driver, which is used
-	  for the BCM281xx SoC family, including BCM11130, BCM11140, BCM11351,
-	  BCM28145, and BCM28155 SoCs.  This driver requires the pinctrl
-	  framework.  GPIO is provided by a separate GPIO driver.
-
 config PINCTRL_LANTIQ
 	bool
 	depends on LANTIQ
@@ -191,6 +173,7 @@ config PINCTRL_PALMAS
 	  open drain configuration for the Palmas series devices like
 	  TPS65913, TPS80036 etc.
 
+source "drivers/pinctrl/bcm/Kconfig"
 source "drivers/pinctrl/berlin/Kconfig"
 source "drivers/pinctrl/freescale/Kconfig"
 source "drivers/pinctrl/intel/Kconfig"
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index c030b3d..c018bbf 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -14,8 +14,6 @@ obj-$(CONFIG_PINCTRL_AS3722)	+= pinctrl-as3722.o
 obj-$(CONFIG_PINCTRL_BF54x)	+= pinctrl-adi2-bf54x.o
 obj-$(CONFIG_PINCTRL_BF60x)	+= pinctrl-adi2-bf60x.o
 obj-$(CONFIG_PINCTRL_AT91)	+= pinctrl-at91.o
-obj-$(CONFIG_PINCTRL_BCM2835)	+= pinctrl-bcm2835.o
-obj-$(CONFIG_PINCTRL_BCM281XX)	+= pinctrl-bcm281xx.o
 obj-$(CONFIG_PINCTRL_FALCON)	+= pinctrl-falcon.o
 obj-$(CONFIG_PINCTRL_PALMAS)	+= pinctrl-palmas.o
 obj-$(CONFIG_PINCTRL_ROCKCHIP)	+= pinctrl-rockchip.o
@@ -36,6 +34,8 @@ obj-$(CONFIG_PINCTRL_LANTIQ)	+= pinctrl-lantiq.o
 obj-$(CONFIG_PINCTRL_TB10X)	+= pinctrl-tb10x.o
 obj-$(CONFIG_PINCTRL_ST) 	+= pinctrl-st.o
 
+obj-$(CONFIG_ARCH_BCM)		+= bcm/
+obj-$(CONFIG_ARCH_BCM2835)	+= bcm/
 obj-$(CONFIG_ARCH_BERLIN)	+= berlin/
 obj-y				+= freescale/
 obj-$(CONFIG_X86)		+= intel/
diff --git a/drivers/pinctrl/bcm/Kconfig b/drivers/pinctrl/bcm/Kconfig
new file mode 100644
index 0000000..bc6d048
--- /dev/null
+++ b/drivers/pinctrl/bcm/Kconfig
@@ -0,0 +1,21 @@
+#
+# Broadcom pinctrl drivers
+#
+
+config PINCTRL_BCM281XX
+	bool "Broadcom BCM281xx pinctrl driver"
+	depends on OF && (ARCH_BCM_MOBILE || COMPILE_TEST)
+	select PINMUX
+	select PINCONF
+	select GENERIC_PINCONF
+	select REGMAP_MMIO
+	help
+	  Say Y here to support Broadcom BCM281xx pinctrl driver, which is used
+	  for the BCM281xx SoC family, including BCM11130, BCM11140, BCM11351,
+	  BCM28145, and BCM28155 SoCs.  This driver requires the pinctrl
+	  framework.  GPIO is provided by a separate GPIO driver.
+
+config PINCTRL_BCM2835
+	bool
+	select PINMUX
+	select PINCONF
diff --git a/drivers/pinctrl/bcm/Makefile b/drivers/pinctrl/bcm/Makefile
new file mode 100644
index 0000000..7ba80a3
--- /dev/null
+++ b/drivers/pinctrl/bcm/Makefile
@@ -0,0 +1,4 @@
+# Broadcom pinctrl support
+
+obj-$(CONFIG_PINCTRL_BCM281XX)	+= pinctrl-bcm281xx.o
+obj-$(CONFIG_PINCTRL_BCM2835)	+= pinctrl-bcm2835.o
diff --git a/drivers/pinctrl/bcm/pinctrl-bcm281xx.c b/drivers/pinctrl/bcm/pinctrl-bcm281xx.c
new file mode 100644
index 0000000..73d99076
--- /dev/null
+++ b/drivers/pinctrl/bcm/pinctrl-bcm281xx.c
@@ -0,0 +1,1455 @@
+/*
+ * Copyright (C) 2013 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include "../core.h"
+#include "../pinctrl-utils.h"
+
+/* BCM281XX Pin Control Registers Definitions */
+
+/* Function Select bits are the same for all pin control registers */
+#define BCM281XX_PIN_REG_F_SEL_MASK		0x0700
+#define BCM281XX_PIN_REG_F_SEL_SHIFT		8
+
+/* Standard pin register */
+#define BCM281XX_STD_PIN_REG_DRV_STR_MASK	0x0007
+#define BCM281XX_STD_PIN_REG_DRV_STR_SHIFT	0
+#define BCM281XX_STD_PIN_REG_INPUT_DIS_MASK	0x0008
+#define BCM281XX_STD_PIN_REG_INPUT_DIS_SHIFT	3
+#define BCM281XX_STD_PIN_REG_SLEW_MASK		0x0010
+#define BCM281XX_STD_PIN_REG_SLEW_SHIFT		4
+#define BCM281XX_STD_PIN_REG_PULL_UP_MASK	0x0020
+#define BCM281XX_STD_PIN_REG_PULL_UP_SHIFT	5
+#define BCM281XX_STD_PIN_REG_PULL_DN_MASK	0x0040
+#define BCM281XX_STD_PIN_REG_PULL_DN_SHIFT	6
+#define BCM281XX_STD_PIN_REG_HYST_MASK		0x0080
+#define BCM281XX_STD_PIN_REG_HYST_SHIFT		7
+
+/* I2C pin register */
+#define BCM281XX_I2C_PIN_REG_INPUT_DIS_MASK	0x0004
+#define BCM281XX_I2C_PIN_REG_INPUT_DIS_SHIFT	2
+#define BCM281XX_I2C_PIN_REG_SLEW_MASK		0x0008
+#define BCM281XX_I2C_PIN_REG_SLEW_SHIFT		3
+#define BCM281XX_I2C_PIN_REG_PULL_UP_STR_MASK	0x0070
+#define BCM281XX_I2C_PIN_REG_PULL_UP_STR_SHIFT	4
+
+/* HDMI pin register */
+#define BCM281XX_HDMI_PIN_REG_INPUT_DIS_MASK	0x0008
+#define BCM281XX_HDMI_PIN_REG_INPUT_DIS_SHIFT	3
+#define BCM281XX_HDMI_PIN_REG_MODE_MASK		0x0010
+#define BCM281XX_HDMI_PIN_REG_MODE_SHIFT	4
+
+/**
+ * bcm281xx_pin_type - types of pin register
+ */
+enum bcm281xx_pin_type {
+	BCM281XX_PIN_TYPE_UNKNOWN = 0,
+	BCM281XX_PIN_TYPE_STD,
+	BCM281XX_PIN_TYPE_I2C,
+	BCM281XX_PIN_TYPE_HDMI,
+};
+
+static enum bcm281xx_pin_type std_pin = BCM281XX_PIN_TYPE_STD;
+static enum bcm281xx_pin_type i2c_pin = BCM281XX_PIN_TYPE_I2C;
+static enum bcm281xx_pin_type hdmi_pin = BCM281XX_PIN_TYPE_HDMI;
+
+/**
+ * bcm281xx_pin_function- define pin function
+ */
+struct bcm281xx_pin_function {
+	const char *name;
+	const char * const *groups;
+	const unsigned ngroups;
+};
+
+/**
+ * bcm281xx_pinctrl_data - Broadcom-specific pinctrl data
+ * @reg_base - base of pinctrl registers
+ */
+struct bcm281xx_pinctrl_data {
+	void __iomem *reg_base;
+
+	/* List of all pins */
+	const struct pinctrl_pin_desc *pins;
+	const unsigned npins;
+
+	const struct bcm281xx_pin_function *functions;
+	const unsigned nfunctions;
+
+	struct regmap *regmap;
+};
+
+/*
+ * Pin number definition.  The order here must be the same as defined in the
+ * PADCTRLREG block in the RDB.
+ */
+#define BCM281XX_PIN_ADCSYNC		0
+#define BCM281XX_PIN_BAT_RM		1
+#define BCM281XX_PIN_BSC1_SCL		2
+#define BCM281XX_PIN_BSC1_SDA		3
+#define BCM281XX_PIN_BSC2_SCL		4
+#define BCM281XX_PIN_BSC2_SDA		5
+#define BCM281XX_PIN_CLASSGPWR		6
+#define BCM281XX_PIN_CLK_CX8		7
+#define BCM281XX_PIN_CLKOUT_0		8
+#define BCM281XX_PIN_CLKOUT_1		9
+#define BCM281XX_PIN_CLKOUT_2		10
+#define BCM281XX_PIN_CLKOUT_3		11
+#define BCM281XX_PIN_CLKREQ_IN_0	12
+#define BCM281XX_PIN_CLKREQ_IN_1	13
+#define BCM281XX_PIN_CWS_SYS_REQ1	14
+#define BCM281XX_PIN_CWS_SYS_REQ2	15
+#define BCM281XX_PIN_CWS_SYS_REQ3	16
+#define BCM281XX_PIN_DIGMIC1_CLK	17
+#define BCM281XX_PIN_DIGMIC1_DQ		18
+#define BCM281XX_PIN_DIGMIC2_CLK	19
+#define BCM281XX_PIN_DIGMIC2_DQ		20
+#define BCM281XX_PIN_GPEN13		21
+#define BCM281XX_PIN_GPEN14		22
+#define BCM281XX_PIN_GPEN15		23
+#define BCM281XX_PIN_GPIO00		24
+#define BCM281XX_PIN_GPIO01		25
+#define BCM281XX_PIN_GPIO02		26
+#define BCM281XX_PIN_GPIO03		27
+#define BCM281XX_PIN_GPIO04		28
+#define BCM281XX_PIN_GPIO05		29
+#define BCM281XX_PIN_GPIO06		30
+#define BCM281XX_PIN_GPIO07		31
+#define BCM281XX_PIN_GPIO08		32
+#define BCM281XX_PIN_GPIO09		33
+#define BCM281XX_PIN_GPIO10		34
+#define BCM281XX_PIN_GPIO11		35
+#define BCM281XX_PIN_GPIO12		36
+#define BCM281XX_PIN_GPIO13		37
+#define BCM281XX_PIN_GPIO14		38
+#define BCM281XX_PIN_GPS_PABLANK	39
+#define BCM281XX_PIN_GPS_TMARK		40
+#define BCM281XX_PIN_HDMI_SCL		41
+#define BCM281XX_PIN_HDMI_SDA		42
+#define BCM281XX_PIN_IC_DM		43
+#define BCM281XX_PIN_IC_DP		44
+#define BCM281XX_PIN_KP_COL_IP_0	45
+#define BCM281XX_PIN_KP_COL_IP_1	46
+#define BCM281XX_PIN_KP_COL_IP_2	47
+#define BCM281XX_PIN_KP_COL_IP_3	48
+#define BCM281XX_PIN_KP_ROW_OP_0	49
+#define BCM281XX_PIN_KP_ROW_OP_1	50
+#define BCM281XX_PIN_KP_ROW_OP_2	51
+#define BCM281XX_PIN_KP_ROW_OP_3	52
+#define BCM281XX_PIN_LCD_B_0		53
+#define BCM281XX_PIN_LCD_B_1		54
+#define BCM281XX_PIN_LCD_B_2		55
+#define BCM281XX_PIN_LCD_B_3		56
+#define BCM281XX_PIN_LCD_B_4		57
+#define BCM281XX_PIN_LCD_B_5		58
+#define BCM281XX_PIN_LCD_B_6		59
+#define BCM281XX_PIN_LCD_B_7		60
+#define BCM281XX_PIN_LCD_G_0		61
+#define BCM281XX_PIN_LCD_G_1		62
+#define BCM281XX_PIN_LCD_G_2		63
+#define BCM281XX_PIN_LCD_G_3		64
+#define BCM281XX_PIN_LCD_G_4		65
+#define BCM281XX_PIN_LCD_G_5		66
+#define BCM281XX_PIN_LCD_G_6		67
+#define BCM281XX_PIN_LCD_G_7		68
+#define BCM281XX_PIN_LCD_HSYNC		69
+#define BCM281XX_PIN_LCD_OE		70
+#define BCM281XX_PIN_LCD_PCLK		71
+#define BCM281XX_PIN_LCD_R_0		72
+#define BCM281XX_PIN_LCD_R_1		73
+#define BCM281XX_PIN_LCD_R_2		74
+#define BCM281XX_PIN_LCD_R_3		75
+#define BCM281XX_PIN_LCD_R_4		76
+#define BCM281XX_PIN_LCD_R_5		77
+#define BCM281XX_PIN_LCD_R_6		78
+#define BCM281XX_PIN_LCD_R_7		79
+#define BCM281XX_PIN_LCD_VSYNC		80
+#define BCM281XX_PIN_MDMGPIO0		81
+#define BCM281XX_PIN_MDMGPIO1		82
+#define BCM281XX_PIN_MDMGPIO2		83
+#define BCM281XX_PIN_MDMGPIO3		84
+#define BCM281XX_PIN_MDMGPIO4		85
+#define BCM281XX_PIN_MDMGPIO5		86
+#define BCM281XX_PIN_MDMGPIO6		87
+#define BCM281XX_PIN_MDMGPIO7		88
+#define BCM281XX_PIN_MDMGPIO8		89
+#define BCM281XX_PIN_MPHI_DATA_0	90
+#define BCM281XX_PIN_MPHI_DATA_1	91
+#define BCM281XX_PIN_MPHI_DATA_2	92
+#define BCM281XX_PIN_MPHI_DATA_3	93
+#define BCM281XX_PIN_MPHI_DATA_4	94
+#define BCM281XX_PIN_MPHI_DATA_5	95
+#define BCM281XX_PIN_MPHI_DATA_6	96
+#define BCM281XX_PIN_MPHI_DATA_7	97
+#define BCM281XX_PIN_MPHI_DATA_8	98
+#define BCM281XX_PIN_MPHI_DATA_9	99
+#define BCM281XX_PIN_MPHI_DATA_10	100
+#define BCM281XX_PIN_MPHI_DATA_11	101
+#define BCM281XX_PIN_MPHI_DATA_12	102
+#define BCM281XX_PIN_MPHI_DATA_13	103
+#define BCM281XX_PIN_MPHI_DATA_14	104
+#define BCM281XX_PIN_MPHI_DATA_15	105
+#define BCM281XX_PIN_MPHI_HA0		106
+#define BCM281XX_PIN_MPHI_HAT0		107
+#define BCM281XX_PIN_MPHI_HAT1		108
+#define BCM281XX_PIN_MPHI_HCE0_N	109
+#define BCM281XX_PIN_MPHI_HCE1_N	110
+#define BCM281XX_PIN_MPHI_HRD_N		111
+#define BCM281XX_PIN_MPHI_HWR_N		112
+#define BCM281XX_PIN_MPHI_RUN0		113
+#define BCM281XX_PIN_MPHI_RUN1		114
+#define BCM281XX_PIN_MTX_SCAN_CLK	115
+#define BCM281XX_PIN_MTX_SCAN_DATA	116
+#define BCM281XX_PIN_NAND_AD_0		117
+#define BCM281XX_PIN_NAND_AD_1		118
+#define BCM281XX_PIN_NAND_AD_2		119
+#define BCM281XX_PIN_NAND_AD_3		120
+#define BCM281XX_PIN_NAND_AD_4		121
+#define BCM281XX_PIN_NAND_AD_5		122
+#define BCM281XX_PIN_NAND_AD_6		123
+#define BCM281XX_PIN_NAND_AD_7		124
+#define BCM281XX_PIN_NAND_ALE		125
+#define BCM281XX_PIN_NAND_CEN_0		126
+#define BCM281XX_PIN_NAND_CEN_1		127
+#define BCM281XX_PIN_NAND_CLE		128
+#define BCM281XX_PIN_NAND_OEN		129
+#define BCM281XX_PIN_NAND_RDY_0		130
+#define BCM281XX_PIN_NAND_RDY_1		131
+#define BCM281XX_PIN_NAND_WEN		132
+#define BCM281XX_PIN_NAND_WP		133
+#define BCM281XX_PIN_PC1		134
+#define BCM281XX_PIN_PC2		135
+#define BCM281XX_PIN_PMU_INT		136
+#define BCM281XX_PIN_PMU_SCL		137
+#define BCM281XX_PIN_PMU_SDA		138
+#define BCM281XX_PIN_RFST2G_MTSLOTEN3G	139
+#define BCM281XX_PIN_RGMII_0_RX_CTL	140
+#define BCM281XX_PIN_RGMII_0_RXC	141
+#define BCM281XX_PIN_RGMII_0_RXD_0	142
+#define BCM281XX_PIN_RGMII_0_RXD_1	143
+#define BCM281XX_PIN_RGMII_0_RXD_2	144
+#define BCM281XX_PIN_RGMII_0_RXD_3	145
+#define BCM281XX_PIN_RGMII_0_TX_CTL	146
+#define BCM281XX_PIN_RGMII_0_TXC	147
+#define BCM281XX_PIN_RGMII_0_TXD_0	148
+#define BCM281XX_PIN_RGMII_0_TXD_1	149
+#define BCM281XX_PIN_RGMII_0_TXD_2	150
+#define BCM281XX_PIN_RGMII_0_TXD_3	151
+#define BCM281XX_PIN_RGMII_1_RX_CTL	152
+#define BCM281XX_PIN_RGMII_1_RXC	153
+#define BCM281XX_PIN_RGMII_1_RXD_0	154
+#define BCM281XX_PIN_RGMII_1_RXD_1	155
+#define BCM281XX_PIN_RGMII_1_RXD_2	156
+#define BCM281XX_PIN_RGMII_1_RXD_3	157
+#define BCM281XX_PIN_RGMII_1_TX_CTL	158
+#define BCM281XX_PIN_RGMII_1_TXC	159
+#define BCM281XX_PIN_RGMII_1_TXD_0	160
+#define BCM281XX_PIN_RGMII_1_TXD_1	161
+#define BCM281XX_PIN_RGMII_1_TXD_2	162
+#define BCM281XX_PIN_RGMII_1_TXD_3	163
+#define BCM281XX_PIN_RGMII_GPIO_0	164
+#define BCM281XX_PIN_RGMII_GPIO_1	165
+#define BCM281XX_PIN_RGMII_GPIO_2	166
+#define BCM281XX_PIN_RGMII_GPIO_3	167
+#define BCM281XX_PIN_RTXDATA2G_TXDATA3G1	168
+#define BCM281XX_PIN_RTXEN2G_TXDATA3G2	169
+#define BCM281XX_PIN_RXDATA3G0		170
+#define BCM281XX_PIN_RXDATA3G1		171
+#define BCM281XX_PIN_RXDATA3G2		172
+#define BCM281XX_PIN_SDIO1_CLK		173
+#define BCM281XX_PIN_SDIO1_CMD		174
+#define BCM281XX_PIN_SDIO1_DATA_0	175
+#define BCM281XX_PIN_SDIO1_DATA_1	176
+#define BCM281XX_PIN_SDIO1_DATA_2	177
+#define BCM281XX_PIN_SDIO1_DATA_3	178
+#define BCM281XX_PIN_SDIO4_CLK		179
+#define BCM281XX_PIN_SDIO4_CMD		180
+#define BCM281XX_PIN_SDIO4_DATA_0	181
+#define BCM281XX_PIN_SDIO4_DATA_1	182
+#define BCM281XX_PIN_SDIO4_DATA_2	183
+#define BCM281XX_PIN_SDIO4_DATA_3	184
+#define BCM281XX_PIN_SIM_CLK		185
+#define BCM281XX_PIN_SIM_DATA		186
+#define BCM281XX_PIN_SIM_DET		187
+#define BCM281XX_PIN_SIM_RESETN		188
+#define BCM281XX_PIN_SIM2_CLK		189
+#define BCM281XX_PIN_SIM2_DATA		190
+#define BCM281XX_PIN_SIM2_DET		191
+#define BCM281XX_PIN_SIM2_RESETN	192
+#define BCM281XX_PIN_SRI_C		193
+#define BCM281XX_PIN_SRI_D		194
+#define BCM281XX_PIN_SRI_E		195
+#define BCM281XX_PIN_SSP_EXTCLK		196
+#define BCM281XX_PIN_SSP0_CLK		197
+#define BCM281XX_PIN_SSP0_FS		198
+#define BCM281XX_PIN_SSP0_RXD		199
+#define BCM281XX_PIN_SSP0_TXD		200
+#define BCM281XX_PIN_SSP2_CLK		201
+#define BCM281XX_PIN_SSP2_FS_0		202
+#define BCM281XX_PIN_SSP2_FS_1		203
+#define BCM281XX_PIN_SSP2_FS_2		204
+#define BCM281XX_PIN_SSP2_FS_3		205
+#define BCM281XX_PIN_SSP2_RXD_0		206
+#define BCM281XX_PIN_SSP2_RXD_1		207
+#define BCM281XX_PIN_SSP2_TXD_0		208
+#define BCM281XX_PIN_SSP2_TXD_1		209
+#define BCM281XX_PIN_SSP3_CLK		210
+#define BCM281XX_PIN_SSP3_FS		211
+#define BCM281XX_PIN_SSP3_RXD		212
+#define BCM281XX_PIN_SSP3_TXD		213
+#define BCM281XX_PIN_SSP4_CLK		214
+#define BCM281XX_PIN_SSP4_FS		215
+#define BCM281XX_PIN_SSP4_RXD		216
+#define BCM281XX_PIN_SSP4_TXD		217
+#define BCM281XX_PIN_SSP5_CLK		218
+#define BCM281XX_PIN_SSP5_FS		219
+#define BCM281XX_PIN_SSP5_RXD		220
+#define BCM281XX_PIN_SSP5_TXD		221
+#define BCM281XX_PIN_SSP6_CLK		222
+#define BCM281XX_PIN_SSP6_FS		223
+#define BCM281XX_PIN_SSP6_RXD		224
+#define BCM281XX_PIN_SSP6_TXD		225
+#define BCM281XX_PIN_STAT_1		226
+#define BCM281XX_PIN_STAT_2		227
+#define BCM281XX_PIN_SYSCLKEN		228
+#define BCM281XX_PIN_TRACECLK		229
+#define BCM281XX_PIN_TRACEDT00		230
+#define BCM281XX_PIN_TRACEDT01		231
+#define BCM281XX_PIN_TRACEDT02		232
+#define BCM281XX_PIN_TRACEDT03		233
+#define BCM281XX_PIN_TRACEDT04		234
+#define BCM281XX_PIN_TRACEDT05		235
+#define BCM281XX_PIN_TRACEDT06		236
+#define BCM281XX_PIN_TRACEDT07		237
+#define BCM281XX_PIN_TRACEDT08		238
+#define BCM281XX_PIN_TRACEDT09		239
+#define BCM281XX_PIN_TRACEDT10		240
+#define BCM281XX_PIN_TRACEDT11		241
+#define BCM281XX_PIN_TRACEDT12		242
+#define BCM281XX_PIN_TRACEDT13		243
+#define BCM281XX_PIN_TRACEDT14		244
+#define BCM281XX_PIN_TRACEDT15		245
+#define BCM281XX_PIN_TXDATA3G0		246
+#define BCM281XX_PIN_TXPWRIND		247
+#define BCM281XX_PIN_UARTB1_UCTS	248
+#define BCM281XX_PIN_UARTB1_URTS	249
+#define BCM281XX_PIN_UARTB1_URXD	250
+#define BCM281XX_PIN_UARTB1_UTXD	251
+#define BCM281XX_PIN_UARTB2_URXD	252
+#define BCM281XX_PIN_UARTB2_UTXD	253
+#define BCM281XX_PIN_UARTB3_UCTS	254
+#define BCM281XX_PIN_UARTB3_URTS	255
+#define BCM281XX_PIN_UARTB3_URXD	256
+#define BCM281XX_PIN_UARTB3_UTXD	257
+#define BCM281XX_PIN_UARTB4_UCTS	258
+#define BCM281XX_PIN_UARTB4_URTS	259
+#define BCM281XX_PIN_UARTB4_URXD	260
+#define BCM281XX_PIN_UARTB4_UTXD	261
+#define BCM281XX_PIN_VC_CAM1_SCL	262
+#define BCM281XX_PIN_VC_CAM1_SDA	263
+#define BCM281XX_PIN_VC_CAM2_SCL	264
+#define BCM281XX_PIN_VC_CAM2_SDA	265
+#define BCM281XX_PIN_VC_CAM3_SCL	266
+#define BCM281XX_PIN_VC_CAM3_SDA	267
+
+#define BCM281XX_PIN_DESC(a, b, c) \
+	{ .number = a, .name = b, .drv_data = &c##_pin }
+
+/*
+ * Pin description definition.  The order here must be the same as defined in
+ * the PADCTRLREG block in the RDB, since the pin number is used as an index
+ * into this array.
+ */
+static const struct pinctrl_pin_desc bcm281xx_pinctrl_pins[] = {
+	BCM281XX_PIN_DESC(BCM281XX_PIN_ADCSYNC, "adcsync", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_BAT_RM, "bat_rm", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_BSC1_SCL, "bsc1_scl", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_BSC1_SDA, "bsc1_sda", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_BSC2_SCL, "bsc2_scl", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_BSC2_SDA, "bsc2_sda", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CLASSGPWR, "classgpwr", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CLK_CX8, "clk_cx8", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKOUT_0, "clkout_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKOUT_1, "clkout_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKOUT_2, "clkout_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKOUT_3, "clkout_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKREQ_IN_0, "clkreq_in_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKREQ_IN_1, "clkreq_in_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CWS_SYS_REQ1, "cws_sys_req1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CWS_SYS_REQ2, "cws_sys_req2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CWS_SYS_REQ3, "cws_sys_req3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_DIGMIC1_CLK, "digmic1_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_DIGMIC1_DQ, "digmic1_dq", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_DIGMIC2_CLK, "digmic2_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_DIGMIC2_DQ, "digmic2_dq", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPEN13, "gpen13", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPEN14, "gpen14", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPEN15, "gpen15", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO00, "gpio00", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO01, "gpio01", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO02, "gpio02", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO03, "gpio03", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO04, "gpio04", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO05, "gpio05", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO06, "gpio06", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO07, "gpio07", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO08, "gpio08", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO09, "gpio09", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO10, "gpio10", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO11, "gpio11", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO12, "gpio12", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO13, "gpio13", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO14, "gpio14", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPS_PABLANK, "gps_pablank", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPS_TMARK, "gps_tmark", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_HDMI_SCL, "hdmi_scl", hdmi),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_HDMI_SDA, "hdmi_sda", hdmi),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_IC_DM, "ic_dm", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_IC_DP, "ic_dp", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_COL_IP_0, "kp_col_ip_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_COL_IP_1, "kp_col_ip_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_COL_IP_2, "kp_col_ip_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_COL_IP_3, "kp_col_ip_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_ROW_OP_0, "kp_row_op_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_ROW_OP_1, "kp_row_op_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_ROW_OP_2, "kp_row_op_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_ROW_OP_3, "kp_row_op_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_0, "lcd_b_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_1, "lcd_b_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_2, "lcd_b_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_3, "lcd_b_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_4, "lcd_b_4", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_5, "lcd_b_5", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_6, "lcd_b_6", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_7, "lcd_b_7", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_0, "lcd_g_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_1, "lcd_g_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_2, "lcd_g_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_3, "lcd_g_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_4, "lcd_g_4", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_5, "lcd_g_5", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_6, "lcd_g_6", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_7, "lcd_g_7", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_HSYNC, "lcd_hsync", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_OE, "lcd_oe", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_PCLK, "lcd_pclk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_0, "lcd_r_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_1, "lcd_r_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_2, "lcd_r_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_3, "lcd_r_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_4, "lcd_r_4", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_5, "lcd_r_5", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_6, "lcd_r_6", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_7, "lcd_r_7", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_VSYNC, "lcd_vsync", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO0, "mdmgpio0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO1, "mdmgpio1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO2, "mdmgpio2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO3, "mdmgpio3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO4, "mdmgpio4", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO5, "mdmgpio5", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO6, "mdmgpio6", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO7, "mdmgpio7", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO8, "mdmgpio8", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_0, "mphi_data_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_1, "mphi_data_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_2, "mphi_data_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_3, "mphi_data_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_4, "mphi_data_4", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_5, "mphi_data_5", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_6, "mphi_data_6", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_7, "mphi_data_7", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_8, "mphi_data_8", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_9, "mphi_data_9", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_10, "mphi_data_10", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_11, "mphi_data_11", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_12, "mphi_data_12", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_13, "mphi_data_13", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_14, "mphi_data_14", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_15, "mphi_data_15", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HA0, "mphi_ha0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HAT0, "mphi_hat0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HAT1, "mphi_hat1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HCE0_N, "mphi_hce0_n", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HCE1_N, "mphi_hce1_n", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HRD_N, "mphi_hrd_n", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HWR_N, "mphi_hwr_n", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_RUN0, "mphi_run0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_RUN1, "mphi_run1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MTX_SCAN_CLK, "mtx_scan_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MTX_SCAN_DATA, "mtx_scan_data", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_0, "nand_ad_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_1, "nand_ad_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_2, "nand_ad_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_3, "nand_ad_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_4, "nand_ad_4", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_5, "nand_ad_5", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_6, "nand_ad_6", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_7, "nand_ad_7", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_ALE, "nand_ale", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_CEN_0, "nand_cen_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_CEN_1, "nand_cen_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_CLE, "nand_cle", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_OEN, "nand_oen", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_RDY_0, "nand_rdy_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_RDY_1, "nand_rdy_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_WEN, "nand_wen", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_WP, "nand_wp", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_PC1, "pc1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_PC2, "pc2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_PMU_INT, "pmu_int", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_PMU_SCL, "pmu_scl", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_PMU_SDA, "pmu_sda", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RFST2G_MTSLOTEN3G, "rfst2g_mtsloten3g",
+		std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RX_CTL, "rgmii_0_rx_ctl", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXC, "rgmii_0_rxc", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXD_0, "rgmii_0_rxd_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXD_1, "rgmii_0_rxd_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXD_2, "rgmii_0_rxd_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXD_3, "rgmii_0_rxd_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TX_CTL, "rgmii_0_tx_ctl", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXC, "rgmii_0_txc", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXD_0, "rgmii_0_txd_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXD_1, "rgmii_0_txd_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXD_2, "rgmii_0_txd_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXD_3, "rgmii_0_txd_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RX_CTL, "rgmii_1_rx_ctl", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXC, "rgmii_1_rxc", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXD_0, "rgmii_1_rxd_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXD_1, "rgmii_1_rxd_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXD_2, "rgmii_1_rxd_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXD_3, "rgmii_1_rxd_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TX_CTL, "rgmii_1_tx_ctl", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXC, "rgmii_1_txc", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXD_0, "rgmii_1_txd_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXD_1, "rgmii_1_txd_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXD_2, "rgmii_1_txd_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXD_3, "rgmii_1_txd_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_GPIO_0, "rgmii_gpio_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_GPIO_1, "rgmii_gpio_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_GPIO_2, "rgmii_gpio_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_GPIO_3, "rgmii_gpio_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RTXDATA2G_TXDATA3G1,
+		"rtxdata2g_txdata3g1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RTXEN2G_TXDATA3G2, "rtxen2g_txdata3g2",
+		std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RXDATA3G0, "rxdata3g0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RXDATA3G1, "rxdata3g1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RXDATA3G2, "rxdata3g2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_CLK, "sdio1_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_CMD, "sdio1_cmd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_DATA_0, "sdio1_data_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_DATA_1, "sdio1_data_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_DATA_2, "sdio1_data_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_DATA_3, "sdio1_data_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_CLK, "sdio4_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_CMD, "sdio4_cmd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_DATA_0, "sdio4_data_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_DATA_1, "sdio4_data_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_DATA_2, "sdio4_data_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_DATA_3, "sdio4_data_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM_CLK, "sim_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM_DATA, "sim_data", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM_DET, "sim_det", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM_RESETN, "sim_resetn", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM2_CLK, "sim2_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM2_DATA, "sim2_data", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM2_DET, "sim2_det", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM2_RESETN, "sim2_resetn", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SRI_C, "sri_c", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SRI_D, "sri_d", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SRI_E, "sri_e", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP_EXTCLK, "ssp_extclk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP0_CLK, "ssp0_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP0_FS, "ssp0_fs", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP0_RXD, "ssp0_rxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP0_TXD, "ssp0_txd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_CLK, "ssp2_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_FS_0, "ssp2_fs_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_FS_1, "ssp2_fs_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_FS_2, "ssp2_fs_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_FS_3, "ssp2_fs_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_RXD_0, "ssp2_rxd_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_RXD_1, "ssp2_rxd_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_TXD_0, "ssp2_txd_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_TXD_1, "ssp2_txd_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP3_CLK, "ssp3_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP3_FS, "ssp3_fs", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP3_RXD, "ssp3_rxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP3_TXD, "ssp3_txd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP4_CLK, "ssp4_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP4_FS, "ssp4_fs", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP4_RXD, "ssp4_rxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP4_TXD, "ssp4_txd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP5_CLK, "ssp5_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP5_FS, "ssp5_fs", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP5_RXD, "ssp5_rxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP5_TXD, "ssp5_txd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP6_CLK, "ssp6_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP6_FS, "ssp6_fs", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP6_RXD, "ssp6_rxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP6_TXD, "ssp6_txd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_STAT_1, "stat_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_STAT_2, "stat_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SYSCLKEN, "sysclken", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACECLK, "traceclk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT00, "tracedt00", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT01, "tracedt01", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT02, "tracedt02", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT03, "tracedt03", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT04, "tracedt04", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT05, "tracedt05", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT06, "tracedt06", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT07, "tracedt07", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT08, "tracedt08", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT09, "tracedt09", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT10, "tracedt10", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT11, "tracedt11", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT12, "tracedt12", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT13, "tracedt13", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT14, "tracedt14", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT15, "tracedt15", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TXDATA3G0, "txdata3g0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TXPWRIND, "txpwrind", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB1_UCTS, "uartb1_ucts", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB1_URTS, "uartb1_urts", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB1_URXD, "uartb1_urxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB1_UTXD, "uartb1_utxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB2_URXD, "uartb2_urxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB2_UTXD, "uartb2_utxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB3_UCTS, "uartb3_ucts", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB3_URTS, "uartb3_urts", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB3_URXD, "uartb3_urxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB3_UTXD, "uartb3_utxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB4_UCTS, "uartb4_ucts", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB4_URTS, "uartb4_urts", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB4_URXD, "uartb4_urxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB4_UTXD, "uartb4_utxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM1_SCL, "vc_cam1_scl", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM1_SDA, "vc_cam1_sda", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM2_SCL, "vc_cam2_scl", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM2_SDA, "vc_cam2_sda", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM3_SCL, "vc_cam3_scl", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM3_SDA, "vc_cam3_sda", i2c),
+};
+
+static const char * const bcm281xx_alt_groups[] = {
+	"adcsync",
+	"bat_rm",
+	"bsc1_scl",
+	"bsc1_sda",
+	"bsc2_scl",
+	"bsc2_sda",
+	"classgpwr",
+	"clk_cx8",
+	"clkout_0",
+	"clkout_1",
+	"clkout_2",
+	"clkout_3",
+	"clkreq_in_0",
+	"clkreq_in_1",
+	"cws_sys_req1",
+	"cws_sys_req2",
+	"cws_sys_req3",
+	"digmic1_clk",
+	"digmic1_dq",
+	"digmic2_clk",
+	"digmic2_dq",
+	"gpen13",
+	"gpen14",
+	"gpen15",
+	"gpio00",
+	"gpio01",
+	"gpio02",
+	"gpio03",
+	"gpio04",
+	"gpio05",
+	"gpio06",
+	"gpio07",
+	"gpio08",
+	"gpio09",
+	"gpio10",
+	"gpio11",
+	"gpio12",
+	"gpio13",
+	"gpio14",
+	"gps_pablank",
+	"gps_tmark",
+	"hdmi_scl",
+	"hdmi_sda",
+	"ic_dm",
+	"ic_dp",
+	"kp_col_ip_0",
+	"kp_col_ip_1",
+	"kp_col_ip_2",
+	"kp_col_ip_3",
+	"kp_row_op_0",
+	"kp_row_op_1",
+	"kp_row_op_2",
+	"kp_row_op_3",
+	"lcd_b_0",
+	"lcd_b_1",
+	"lcd_b_2",
+	"lcd_b_3",
+	"lcd_b_4",
+	"lcd_b_5",
+	"lcd_b_6",
+	"lcd_b_7",
+	"lcd_g_0",
+	"lcd_g_1",
+	"lcd_g_2",
+	"lcd_g_3",
+	"lcd_g_4",
+	"lcd_g_5",
+	"lcd_g_6",
+	"lcd_g_7",
+	"lcd_hsync",
+	"lcd_oe",
+	"lcd_pclk",
+	"lcd_r_0",
+	"lcd_r_1",
+	"lcd_r_2",
+	"lcd_r_3",
+	"lcd_r_4",
+	"lcd_r_5",
+	"lcd_r_6",
+	"lcd_r_7",
+	"lcd_vsync",
+	"mdmgpio0",
+	"mdmgpio1",
+	"mdmgpio2",
+	"mdmgpio3",
+	"mdmgpio4",
+	"mdmgpio5",
+	"mdmgpio6",
+	"mdmgpio7",
+	"mdmgpio8",
+	"mphi_data_0",
+	"mphi_data_1",
+	"mphi_data_2",
+	"mphi_data_3",
+	"mphi_data_4",
+	"mphi_data_5",
+	"mphi_data_6",
+	"mphi_data_7",
+	"mphi_data_8",
+	"mphi_data_9",
+	"mphi_data_10",
+	"mphi_data_11",
+	"mphi_data_12",
+	"mphi_data_13",
+	"mphi_data_14",
+	"mphi_data_15",
+	"mphi_ha0",
+	"mphi_hat0",
+	"mphi_hat1",
+	"mphi_hce0_n",
+	"mphi_hce1_n",
+	"mphi_hrd_n",
+	"mphi_hwr_n",
+	"mphi_run0",
+	"mphi_run1",
+	"mtx_scan_clk",
+	"mtx_scan_data",
+	"nand_ad_0",
+	"nand_ad_1",
+	"nand_ad_2",
+	"nand_ad_3",
+	"nand_ad_4",
+	"nand_ad_5",
+	"nand_ad_6",
+	"nand_ad_7",
+	"nand_ale",
+	"nand_cen_0",
+	"nand_cen_1",
+	"nand_cle",
+	"nand_oen",
+	"nand_rdy_0",
+	"nand_rdy_1",
+	"nand_wen",
+	"nand_wp",
+	"pc1",
+	"pc2",
+	"pmu_int",
+	"pmu_scl",
+	"pmu_sda",
+	"rfst2g_mtsloten3g",
+	"rgmii_0_rx_ctl",
+	"rgmii_0_rxc",
+	"rgmii_0_rxd_0",
+	"rgmii_0_rxd_1",
+	"rgmii_0_rxd_2",
+	"rgmii_0_rxd_3",
+	"rgmii_0_tx_ctl",
+	"rgmii_0_txc",
+	"rgmii_0_txd_0",
+	"rgmii_0_txd_1",
+	"rgmii_0_txd_2",
+	"rgmii_0_txd_3",
+	"rgmii_1_rx_ctl",
+	"rgmii_1_rxc",
+	"rgmii_1_rxd_0",
+	"rgmii_1_rxd_1",
+	"rgmii_1_rxd_2",
+	"rgmii_1_rxd_3",
+	"rgmii_1_tx_ctl",
+	"rgmii_1_txc",
+	"rgmii_1_txd_0",
+	"rgmii_1_txd_1",
+	"rgmii_1_txd_2",
+	"rgmii_1_txd_3",
+	"rgmii_gpio_0",
+	"rgmii_gpio_1",
+	"rgmii_gpio_2",
+	"rgmii_gpio_3",
+	"rtxdata2g_txdata3g1",
+	"rtxen2g_txdata3g2",
+	"rxdata3g0",
+	"rxdata3g1",
+	"rxdata3g2",
+	"sdio1_clk",
+	"sdio1_cmd",
+	"sdio1_data_0",
+	"sdio1_data_1",
+	"sdio1_data_2",
+	"sdio1_data_3",
+	"sdio4_clk",
+	"sdio4_cmd",
+	"sdio4_data_0",
+	"sdio4_data_1",
+	"sdio4_data_2",
+	"sdio4_data_3",
+	"sim_clk",
+	"sim_data",
+	"sim_det",
+	"sim_resetn",
+	"sim2_clk",
+	"sim2_data",
+	"sim2_det",
+	"sim2_resetn",
+	"sri_c",
+	"sri_d",
+	"sri_e",
+	"ssp_extclk",
+	"ssp0_clk",
+	"ssp0_fs",
+	"ssp0_rxd",
+	"ssp0_txd",
+	"ssp2_clk",
+	"ssp2_fs_0",
+	"ssp2_fs_1",
+	"ssp2_fs_2",
+	"ssp2_fs_3",
+	"ssp2_rxd_0",
+	"ssp2_rxd_1",
+	"ssp2_txd_0",
+	"ssp2_txd_1",
+	"ssp3_clk",
+	"ssp3_fs",
+	"ssp3_rxd",
+	"ssp3_txd",
+	"ssp4_clk",
+	"ssp4_fs",
+	"ssp4_rxd",
+	"ssp4_txd",
+	"ssp5_clk",
+	"ssp5_fs",
+	"ssp5_rxd",
+	"ssp5_txd",
+	"ssp6_clk",
+	"ssp6_fs",
+	"ssp6_rxd",
+	"ssp6_txd",
+	"stat_1",
+	"stat_2",
+	"sysclken",
+	"traceclk",
+	"tracedt00",
+	"tracedt01",
+	"tracedt02",
+	"tracedt03",
+	"tracedt04",
+	"tracedt05",
+	"tracedt06",
+	"tracedt07",
+	"tracedt08",
+	"tracedt09",
+	"tracedt10",
+	"tracedt11",
+	"tracedt12",
+	"tracedt13",
+	"tracedt14",
+	"tracedt15",
+	"txdata3g0",
+	"txpwrind",
+	"uartb1_ucts",
+	"uartb1_urts",
+	"uartb1_urxd",
+	"uartb1_utxd",
+	"uartb2_urxd",
+	"uartb2_utxd",
+	"uartb3_ucts",
+	"uartb3_urts",
+	"uartb3_urxd",
+	"uartb3_utxd",
+	"uartb4_ucts",
+	"uartb4_urts",
+	"uartb4_urxd",
+	"uartb4_utxd",
+	"vc_cam1_scl",
+	"vc_cam1_sda",
+	"vc_cam2_scl",
+	"vc_cam2_sda",
+	"vc_cam3_scl",
+	"vc_cam3_sda",
+};
+
+/* Every pin can implement all ALT1-ALT4 functions */
+#define BCM281XX_PIN_FUNCTION(fcn_name)			\
+{							\
+	.name = #fcn_name,				\
+	.groups = bcm281xx_alt_groups,			\
+	.ngroups = ARRAY_SIZE(bcm281xx_alt_groups),	\
+}
+
+static const struct bcm281xx_pin_function bcm281xx_functions[] = {
+	BCM281XX_PIN_FUNCTION(alt1),
+	BCM281XX_PIN_FUNCTION(alt2),
+	BCM281XX_PIN_FUNCTION(alt3),
+	BCM281XX_PIN_FUNCTION(alt4),
+};
+
+static struct bcm281xx_pinctrl_data bcm281xx_pinctrl = {
+	.pins = bcm281xx_pinctrl_pins,
+	.npins = ARRAY_SIZE(bcm281xx_pinctrl_pins),
+	.functions = bcm281xx_functions,
+	.nfunctions = ARRAY_SIZE(bcm281xx_functions),
+};
+
+static inline enum bcm281xx_pin_type pin_type_get(struct pinctrl_dev *pctldev,
+						  unsigned pin)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+
+	if (pin >= pdata->npins)
+		return BCM281XX_PIN_TYPE_UNKNOWN;
+
+	return *(enum bcm281xx_pin_type *)(pdata->pins[pin].drv_data);
+}
+
+#define BCM281XX_PIN_SHIFT(type, param) \
+	(BCM281XX_ ## type ## _PIN_REG_ ## param ## _SHIFT)
+
+#define BCM281XX_PIN_MASK(type, param) \
+	(BCM281XX_ ## type ## _PIN_REG_ ## param ## _MASK)
+
+/*
+ * This helper function is used to build up the value and mask used to write to
+ * a pin register, but does not actually write to the register.
+ */
+static inline void bcm281xx_pin_update(u32 *reg_val, u32 *reg_mask,
+				       u32 param_val, u32 param_shift,
+				       u32 param_mask)
+{
+	*reg_val &= ~param_mask;
+	*reg_val |= (param_val << param_shift) & param_mask;
+	*reg_mask |= param_mask;
+}
+
+static struct regmap_config bcm281xx_pinctrl_regmap_config = {
+	.reg_bits = 32,
+	.reg_stride = 4,
+	.val_bits = 32,
+	.max_register = BCM281XX_PIN_VC_CAM3_SDA,
+};
+
+static int bcm281xx_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+
+	return pdata->npins;
+}
+
+static const char *bcm281xx_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
+						   unsigned group)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+
+	return pdata->pins[group].name;
+}
+
+static int bcm281xx_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
+					   unsigned group,
+					   const unsigned **pins,
+					   unsigned *num_pins)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+
+	*pins = &pdata->pins[group].number;
+	*num_pins = 1;
+
+	return 0;
+}
+
+static void bcm281xx_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
+					  struct seq_file *s,
+					  unsigned offset)
+{
+	seq_printf(s, " %s", dev_name(pctldev->dev));
+}
+
+static struct pinctrl_ops bcm281xx_pinctrl_ops = {
+	.get_groups_count = bcm281xx_pinctrl_get_groups_count,
+	.get_group_name = bcm281xx_pinctrl_get_group_name,
+	.get_group_pins = bcm281xx_pinctrl_get_group_pins,
+	.pin_dbg_show = bcm281xx_pinctrl_pin_dbg_show,
+	.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
+	.dt_free_map = pinctrl_utils_dt_free_map,
+};
+
+static int bcm281xx_pinctrl_get_fcns_count(struct pinctrl_dev *pctldev)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+
+	return pdata->nfunctions;
+}
+
+static const char *bcm281xx_pinctrl_get_fcn_name(struct pinctrl_dev *pctldev,
+						 unsigned function)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+
+	return pdata->functions[function].name;
+}
+
+static int bcm281xx_pinctrl_get_fcn_groups(struct pinctrl_dev *pctldev,
+					   unsigned function,
+					   const char * const **groups,
+					   unsigned * const num_groups)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+
+	*groups = pdata->functions[function].groups;
+	*num_groups = pdata->functions[function].ngroups;
+
+	return 0;
+}
+
+static int bcm281xx_pinmux_set(struct pinctrl_dev *pctldev,
+			       unsigned function,
+			       unsigned group)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+	const struct bcm281xx_pin_function *f = &pdata->functions[function];
+	u32 offset = 4 * pdata->pins[group].number;
+	int rc = 0;
+
+	dev_dbg(pctldev->dev,
+		"%s(): Enable function %s (%d) of pin %s (%d) @offset 0x%x.\n",
+		__func__, f->name, function, pdata->pins[group].name,
+		pdata->pins[group].number, offset);
+
+	rc = regmap_update_bits(pdata->regmap, offset,
+		BCM281XX_PIN_REG_F_SEL_MASK,
+		function << BCM281XX_PIN_REG_F_SEL_SHIFT);
+	if (rc)
+		dev_err(pctldev->dev,
+			"Error updating register for pin %s (%d).\n",
+			pdata->pins[group].name, pdata->pins[group].number);
+
+	return rc;
+}
+
+static struct pinmux_ops bcm281xx_pinctrl_pinmux_ops = {
+	.get_functions_count = bcm281xx_pinctrl_get_fcns_count,
+	.get_function_name = bcm281xx_pinctrl_get_fcn_name,
+	.get_function_groups = bcm281xx_pinctrl_get_fcn_groups,
+	.set_mux = bcm281xx_pinmux_set,
+};
+
+static int bcm281xx_pinctrl_pin_config_get(struct pinctrl_dev *pctldev,
+					   unsigned pin,
+					   unsigned long *config)
+{
+	return -ENOTSUPP;
+}
+
+
+/* Goes through the configs and update register val/mask */
+static int bcm281xx_std_pin_update(struct pinctrl_dev *pctldev,
+				   unsigned pin,
+				   unsigned long *configs,
+				   unsigned num_configs,
+				   u32 *val,
+				   u32 *mask)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+	int i;
+	enum pin_config_param param;
+	u16 arg;
+
+	for (i = 0; i < num_configs; i++) {
+		param = pinconf_to_config_param(configs[i]);
+		arg = pinconf_to_config_argument(configs[i]);
+
+		switch (param) {
+		case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
+			arg = (arg >= 1 ? 1 : 0);
+			bcm281xx_pin_update(val, mask, arg,
+				BCM281XX_PIN_SHIFT(STD, HYST),
+				BCM281XX_PIN_MASK(STD, HYST));
+			break;
+		/*
+		 * The pin bias can only be one of pull-up, pull-down, or
+		 * disable.  The user does not need to specify a value for the
+		 * property, and the default value from pinconf-generic is
+		 * ignored.
+		 */
+		case PIN_CONFIG_BIAS_DISABLE:
+			bcm281xx_pin_update(val, mask, 0,
+				BCM281XX_PIN_SHIFT(STD, PULL_UP),
+				BCM281XX_PIN_MASK(STD, PULL_UP));
+			bcm281xx_pin_update(val, mask, 0,
+				BCM281XX_PIN_SHIFT(STD, PULL_DN),
+				BCM281XX_PIN_MASK(STD, PULL_DN));
+			break;
+
+		case PIN_CONFIG_BIAS_PULL_UP:
+			bcm281xx_pin_update(val, mask, 1,
+				BCM281XX_PIN_SHIFT(STD, PULL_UP),
+				BCM281XX_PIN_MASK(STD, PULL_UP));
+			bcm281xx_pin_update(val, mask, 0,
+				BCM281XX_PIN_SHIFT(STD, PULL_DN),
+				BCM281XX_PIN_MASK(STD, PULL_DN));
+			break;
+
+		case PIN_CONFIG_BIAS_PULL_DOWN:
+			bcm281xx_pin_update(val, mask, 0,
+				BCM281XX_PIN_SHIFT(STD, PULL_UP),
+				BCM281XX_PIN_MASK(STD, PULL_UP));
+			bcm281xx_pin_update(val, mask, 1,
+				BCM281XX_PIN_SHIFT(STD, PULL_DN),
+				BCM281XX_PIN_MASK(STD, PULL_DN));
+			break;
+
+		case PIN_CONFIG_SLEW_RATE:
+			arg = (arg >= 1 ? 1 : 0);
+			bcm281xx_pin_update(val, mask, arg,
+				BCM281XX_PIN_SHIFT(STD, SLEW),
+				BCM281XX_PIN_MASK(STD, SLEW));
+			break;
+
+		case PIN_CONFIG_INPUT_ENABLE:
+			/* inversed since register is for input _disable_ */
+			arg = (arg >= 1 ? 0 : 1);
+			bcm281xx_pin_update(val, mask, arg,
+				BCM281XX_PIN_SHIFT(STD, INPUT_DIS),
+				BCM281XX_PIN_MASK(STD, INPUT_DIS));
+			break;
+
+		case PIN_CONFIG_DRIVE_STRENGTH:
+			/* Valid range is 2-16 mA, even numbers only */
+			if ((arg < 2) || (arg > 16) || (arg % 2)) {
+				dev_err(pctldev->dev,
+					"Invalid Drive Strength value (%d) for "
+					"pin %s (%d). Valid values are "
+					"(2..16) mA, even numbers only.\n",
+					arg, pdata->pins[pin].name, pin);
+				return -EINVAL;
+			}
+			bcm281xx_pin_update(val, mask, (arg/2)-1,
+				BCM281XX_PIN_SHIFT(STD, DRV_STR),
+				BCM281XX_PIN_MASK(STD, DRV_STR));
+			break;
+
+		default:
+			dev_err(pctldev->dev,
+				"Unrecognized pin config %d for pin %s (%d).\n",
+				param, pdata->pins[pin].name, pin);
+			return -EINVAL;
+
+		} /* switch config */
+	} /* for each config */
+
+	return 0;
+}
+
+/*
+ * The pull-up strength for an I2C pin is represented by bits 4-6 in the
+ * register with the following mapping:
+ *   0b000: No pull-up
+ *   0b001: 1200 Ohm
+ *   0b010: 1800 Ohm
+ *   0b011: 720 Ohm
+ *   0b100: 2700 Ohm
+ *   0b101: 831 Ohm
+ *   0b110: 1080 Ohm
+ *   0b111: 568 Ohm
+ * This array maps pull-up strength in Ohms to register values (1+index).
+ */
+static const u16 bcm281xx_pullup_map[] = {
+	1200, 1800, 720, 2700, 831, 1080, 568
+};
+
+/* Goes through the configs and update register val/mask */
+static int bcm281xx_i2c_pin_update(struct pinctrl_dev *pctldev,
+				   unsigned pin,
+				   unsigned long *configs,
+				   unsigned num_configs,
+				   u32 *val,
+				   u32 *mask)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+	int i, j;
+	enum pin_config_param param;
+	u16 arg;
+
+	for (i = 0; i < num_configs; i++) {
+		param = pinconf_to_config_param(configs[i]);
+		arg = pinconf_to_config_argument(configs[i]);
+
+		switch (param) {
+		case PIN_CONFIG_BIAS_PULL_UP:
+			for (j = 0; j < ARRAY_SIZE(bcm281xx_pullup_map); j++)
+				if (bcm281xx_pullup_map[j] == arg)
+					break;
+
+			if (j == ARRAY_SIZE(bcm281xx_pullup_map)) {
+				dev_err(pctldev->dev,
+					"Invalid pull-up value (%d) for pin %s "
+					"(%d). Valid values are 568, 720, 831, "
+					"1080, 1200, 1800, 2700 Ohms.\n",
+					arg, pdata->pins[pin].name, pin);
+				return -EINVAL;
+			}
+
+			bcm281xx_pin_update(val, mask, j+1,
+				BCM281XX_PIN_SHIFT(I2C, PULL_UP_STR),
+				BCM281XX_PIN_MASK(I2C, PULL_UP_STR));
+			break;
+
+		case PIN_CONFIG_BIAS_DISABLE:
+			bcm281xx_pin_update(val, mask, 0,
+				BCM281XX_PIN_SHIFT(I2C, PULL_UP_STR),
+				BCM281XX_PIN_MASK(I2C, PULL_UP_STR));
+			break;
+
+		case PIN_CONFIG_SLEW_RATE:
+			arg = (arg >= 1 ? 1 : 0);
+			bcm281xx_pin_update(val, mask, arg,
+				BCM281XX_PIN_SHIFT(I2C, SLEW),
+				BCM281XX_PIN_MASK(I2C, SLEW));
+			break;
+
+		case PIN_CONFIG_INPUT_ENABLE:
+			/* inversed since register is for input _disable_ */
+			arg = (arg >= 1 ? 0 : 1);
+			bcm281xx_pin_update(val, mask, arg,
+				BCM281XX_PIN_SHIFT(I2C, INPUT_DIS),
+				BCM281XX_PIN_MASK(I2C, INPUT_DIS));
+			break;
+
+		default:
+			dev_err(pctldev->dev,
+				"Unrecognized pin config %d for pin %s (%d).\n",
+				param, pdata->pins[pin].name, pin);
+			return -EINVAL;
+
+		} /* switch config */
+	} /* for each config */
+
+	return 0;
+}
+
+/* Goes through the configs and update register val/mask */
+static int bcm281xx_hdmi_pin_update(struct pinctrl_dev *pctldev,
+				    unsigned pin,
+				    unsigned long *configs,
+				    unsigned num_configs,
+				    u32 *val,
+				    u32 *mask)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+	int i;
+	enum pin_config_param param;
+	u16 arg;
+
+	for (i = 0; i < num_configs; i++) {
+		param = pinconf_to_config_param(configs[i]);
+		arg = pinconf_to_config_argument(configs[i]);
+
+		switch (param) {
+		case PIN_CONFIG_SLEW_RATE:
+			arg = (arg >= 1 ? 1 : 0);
+			bcm281xx_pin_update(val, mask, arg,
+				BCM281XX_PIN_SHIFT(HDMI, MODE),
+				BCM281XX_PIN_MASK(HDMI, MODE));
+			break;
+
+		case PIN_CONFIG_INPUT_ENABLE:
+			/* inversed since register is for input _disable_ */
+			arg = (arg >= 1 ? 0 : 1);
+			bcm281xx_pin_update(val, mask, arg,
+				BCM281XX_PIN_SHIFT(HDMI, INPUT_DIS),
+				BCM281XX_PIN_MASK(HDMI, INPUT_DIS));
+			break;
+
+		default:
+			dev_err(pctldev->dev,
+				"Unrecognized pin config %d for pin %s (%d).\n",
+				param, pdata->pins[pin].name, pin);
+			return -EINVAL;
+
+		} /* switch config */
+	} /* for each config */
+
+	return 0;
+}
+
+static int bcm281xx_pinctrl_pin_config_set(struct pinctrl_dev *pctldev,
+					   unsigned pin,
+					   unsigned long *configs,
+					   unsigned num_configs)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+	enum bcm281xx_pin_type pin_type;
+	u32 offset = 4 * pin;
+	u32 cfg_val, cfg_mask;
+	int rc;
+
+	cfg_val = 0;
+	cfg_mask = 0;
+	pin_type = pin_type_get(pctldev, pin);
+
+	/* Different pins have different configuration options */
+	switch (pin_type) {
+	case BCM281XX_PIN_TYPE_STD:
+		rc = bcm281xx_std_pin_update(pctldev, pin, configs,
+			num_configs, &cfg_val, &cfg_mask);
+		break;
+
+	case BCM281XX_PIN_TYPE_I2C:
+		rc = bcm281xx_i2c_pin_update(pctldev, pin, configs,
+			num_configs, &cfg_val, &cfg_mask);
+		break;
+
+	case BCM281XX_PIN_TYPE_HDMI:
+		rc = bcm281xx_hdmi_pin_update(pctldev, pin, configs,
+			num_configs, &cfg_val, &cfg_mask);
+		break;
+
+	default:
+		dev_err(pctldev->dev, "Unknown pin type for pin %s (%d).\n",
+			pdata->pins[pin].name, pin);
+		return -EINVAL;
+
+	} /* switch pin type */
+
+	if (rc)
+		return rc;
+
+	dev_dbg(pctldev->dev,
+		"%s(): Set pin %s (%d) with config 0x%x, mask 0x%x\n",
+		__func__, pdata->pins[pin].name, pin, cfg_val, cfg_mask);
+
+	rc = regmap_update_bits(pdata->regmap, offset, cfg_mask, cfg_val);
+	if (rc) {
+		dev_err(pctldev->dev,
+			"Error updating register for pin %s (%d).\n",
+			pdata->pins[pin].name, pin);
+		return rc;
+	}
+
+	return 0;
+}
+
+static struct pinconf_ops bcm281xx_pinctrl_pinconf_ops = {
+	.pin_config_get = bcm281xx_pinctrl_pin_config_get,
+	.pin_config_set = bcm281xx_pinctrl_pin_config_set,
+};
+
+static struct pinctrl_desc bcm281xx_pinctrl_desc = {
+	/* name, pins, npins members initialized in probe function */
+	.pctlops = &bcm281xx_pinctrl_ops,
+	.pmxops = &bcm281xx_pinctrl_pinmux_ops,
+	.confops = &bcm281xx_pinctrl_pinconf_ops,
+	.owner = THIS_MODULE,
+};
+
+static int __init bcm281xx_pinctrl_probe(struct platform_device *pdev)
+{
+	struct bcm281xx_pinctrl_data *pdata = &bcm281xx_pinctrl;
+	struct resource *res;
+	struct pinctrl_dev *pctl;
+
+	/* So far We can assume there is only 1 bank of registers */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	pdata->reg_base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(pdata->reg_base)) {
+		dev_err(&pdev->dev, "Failed to ioremap MEM resource\n");
+		return -ENODEV;
+	}
+
+	/* Initialize the dynamic part of pinctrl_desc */
+	pdata->regmap = devm_regmap_init_mmio(&pdev->dev, pdata->reg_base,
+		&bcm281xx_pinctrl_regmap_config);
+	if (IS_ERR(pdata->regmap)) {
+		dev_err(&pdev->dev, "Regmap MMIO init failed.\n");
+		return -ENODEV;
+	}
+
+	bcm281xx_pinctrl_desc.name = dev_name(&pdev->dev);
+	bcm281xx_pinctrl_desc.pins = bcm281xx_pinctrl.pins;
+	bcm281xx_pinctrl_desc.npins = bcm281xx_pinctrl.npins;
+
+	pctl = pinctrl_register(&bcm281xx_pinctrl_desc,
+				&pdev->dev,
+				pdata);
+	if (!pctl) {
+		dev_err(&pdev->dev, "Failed to register pinctrl\n");
+		return -ENODEV;
+	}
+
+	platform_set_drvdata(pdev, pdata);
+
+	return 0;
+}
+
+static struct of_device_id bcm281xx_pinctrl_of_match[] = {
+	{ .compatible = "brcm,bcm11351-pinctrl", },
+	{ },
+};
+
+static struct platform_driver bcm281xx_pinctrl_driver = {
+	.driver = {
+		.name = "bcm281xx-pinctrl",
+		.of_match_table = bcm281xx_pinctrl_of_match,
+	},
+};
+
+module_platform_driver_probe(bcm281xx_pinctrl_driver, bcm281xx_pinctrl_probe);
+
+MODULE_AUTHOR("Broadcom Corporation <bcm-kernel-feedback-list@broadcom.com>");
+MODULE_AUTHOR("Sherman Yin <syin@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom BCM281xx pinctrl driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/pinctrl/bcm/pinctrl-bcm2835.c b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
new file mode 100644
index 0000000..9aa8a3f
--- /dev/null
+++ b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
@@ -0,0 +1,1072 @@
+/*
+ * Driver for Broadcom BCM2835 GPIO unit (pinctrl + GPIO)
+ *
+ * Copyright (C) 2012 Chris Boot, Simon Arlott, Stephen Warren
+ *
+ * This driver is inspired by:
+ * pinctrl-nomadik.c, please see original file for copyright information
+ * pinctrl-tegra.c, please see original file for copyright information
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/bitmap.h>
+#include <linux/bug.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/irqdesc.h>
+#include <linux/irqdomain.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/pinctrl/machine.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/platform_device.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+
+#define MODULE_NAME "pinctrl-bcm2835"
+#define BCM2835_NUM_GPIOS 54
+#define BCM2835_NUM_BANKS 2
+
+#define BCM2835_PIN_BITMAP_SZ \
+	DIV_ROUND_UP(BCM2835_NUM_GPIOS, sizeof(unsigned long) * 8)
+
+/* GPIO register offsets */
+#define GPFSEL0		0x0	/* Function Select */
+#define GPSET0		0x1c	/* Pin Output Set */
+#define GPCLR0		0x28	/* Pin Output Clear */
+#define GPLEV0		0x34	/* Pin Level */
+#define GPEDS0		0x40	/* Pin Event Detect Status */
+#define GPREN0		0x4c	/* Pin Rising Edge Detect Enable */
+#define GPFEN0		0x58	/* Pin Falling Edge Detect Enable */
+#define GPHEN0		0x64	/* Pin High Detect Enable */
+#define GPLEN0		0x70	/* Pin Low Detect Enable */
+#define GPAREN0		0x7c	/* Pin Async Rising Edge Detect */
+#define GPAFEN0		0x88	/* Pin Async Falling Edge Detect */
+#define GPPUD		0x94	/* Pin Pull-up/down Enable */
+#define GPPUDCLK0	0x98	/* Pin Pull-up/down Enable Clock */
+
+#define FSEL_REG(p)		(GPFSEL0 + (((p) / 10) * 4))
+#define FSEL_SHIFT(p)		(((p) % 10) * 3)
+#define GPIO_REG_OFFSET(p)	((p) / 32)
+#define GPIO_REG_SHIFT(p)	((p) % 32)
+
+enum bcm2835_pinconf_param {
+	/* argument: bcm2835_pinconf_pull */
+	BCM2835_PINCONF_PARAM_PULL,
+};
+
+enum bcm2835_pinconf_pull {
+	BCM2835_PINCONFIG_PULL_NONE,
+	BCM2835_PINCONFIG_PULL_DOWN,
+	BCM2835_PINCONFIG_PULL_UP,
+};
+
+#define BCM2835_PINCONF_PACK(_param_, _arg_) ((_param_) << 16 | (_arg_))
+#define BCM2835_PINCONF_UNPACK_PARAM(_conf_) ((_conf_) >> 16)
+#define BCM2835_PINCONF_UNPACK_ARG(_conf_) ((_conf_) & 0xffff)
+
+struct bcm2835_gpio_irqdata {
+	struct bcm2835_pinctrl *pc;
+	int bank;
+};
+
+struct bcm2835_pinctrl {
+	struct device *dev;
+	void __iomem *base;
+	int irq[BCM2835_NUM_BANKS];
+
+	/* note: locking assumes each bank will have its own unsigned long */
+	unsigned long enabled_irq_map[BCM2835_NUM_BANKS];
+	unsigned int irq_type[BCM2835_NUM_GPIOS];
+
+	struct pinctrl_dev *pctl_dev;
+	struct irq_domain *irq_domain;
+	struct gpio_chip gpio_chip;
+	struct pinctrl_gpio_range gpio_range;
+
+	struct bcm2835_gpio_irqdata irq_data[BCM2835_NUM_BANKS];
+	spinlock_t irq_lock[BCM2835_NUM_BANKS];
+};
+
+static struct lock_class_key gpio_lock_class;
+
+/* pins are just named GPIO0..GPIO53 */
+#define BCM2835_GPIO_PIN(a) PINCTRL_PIN(a, "gpio" #a)
+static struct pinctrl_pin_desc bcm2835_gpio_pins[] = {
+	BCM2835_GPIO_PIN(0),
+	BCM2835_GPIO_PIN(1),
+	BCM2835_GPIO_PIN(2),
+	BCM2835_GPIO_PIN(3),
+	BCM2835_GPIO_PIN(4),
+	BCM2835_GPIO_PIN(5),
+	BCM2835_GPIO_PIN(6),
+	BCM2835_GPIO_PIN(7),
+	BCM2835_GPIO_PIN(8),
+	BCM2835_GPIO_PIN(9),
+	BCM2835_GPIO_PIN(10),
+	BCM2835_GPIO_PIN(11),
+	BCM2835_GPIO_PIN(12),
+	BCM2835_GPIO_PIN(13),
+	BCM2835_GPIO_PIN(14),
+	BCM2835_GPIO_PIN(15),
+	BCM2835_GPIO_PIN(16),
+	BCM2835_GPIO_PIN(17),
+	BCM2835_GPIO_PIN(18),
+	BCM2835_GPIO_PIN(19),
+	BCM2835_GPIO_PIN(20),
+	BCM2835_GPIO_PIN(21),
+	BCM2835_GPIO_PIN(22),
+	BCM2835_GPIO_PIN(23),
+	BCM2835_GPIO_PIN(24),
+	BCM2835_GPIO_PIN(25),
+	BCM2835_GPIO_PIN(26),
+	BCM2835_GPIO_PIN(27),
+	BCM2835_GPIO_PIN(28),
+	BCM2835_GPIO_PIN(29),
+	BCM2835_GPIO_PIN(30),
+	BCM2835_GPIO_PIN(31),
+	BCM2835_GPIO_PIN(32),
+	BCM2835_GPIO_PIN(33),
+	BCM2835_GPIO_PIN(34),
+	BCM2835_GPIO_PIN(35),
+	BCM2835_GPIO_PIN(36),
+	BCM2835_GPIO_PIN(37),
+	BCM2835_GPIO_PIN(38),
+	BCM2835_GPIO_PIN(39),
+	BCM2835_GPIO_PIN(40),
+	BCM2835_GPIO_PIN(41),
+	BCM2835_GPIO_PIN(42),
+	BCM2835_GPIO_PIN(43),
+	BCM2835_GPIO_PIN(44),
+	BCM2835_GPIO_PIN(45),
+	BCM2835_GPIO_PIN(46),
+	BCM2835_GPIO_PIN(47),
+	BCM2835_GPIO_PIN(48),
+	BCM2835_GPIO_PIN(49),
+	BCM2835_GPIO_PIN(50),
+	BCM2835_GPIO_PIN(51),
+	BCM2835_GPIO_PIN(52),
+	BCM2835_GPIO_PIN(53),
+};
+
+/* one pin per group */
+static const char * const bcm2835_gpio_groups[] = {
+	"gpio0",
+	"gpio1",
+	"gpio2",
+	"gpio3",
+	"gpio4",
+	"gpio5",
+	"gpio6",
+	"gpio7",
+	"gpio8",
+	"gpio9",
+	"gpio10",
+	"gpio11",
+	"gpio12",
+	"gpio13",
+	"gpio14",
+	"gpio15",
+	"gpio16",
+	"gpio17",
+	"gpio18",
+	"gpio19",
+	"gpio20",
+	"gpio21",
+	"gpio22",
+	"gpio23",
+	"gpio24",
+	"gpio25",
+	"gpio26",
+	"gpio27",
+	"gpio28",
+	"gpio29",
+	"gpio30",
+	"gpio31",
+	"gpio32",
+	"gpio33",
+	"gpio34",
+	"gpio35",
+	"gpio36",
+	"gpio37",
+	"gpio38",
+	"gpio39",
+	"gpio40",
+	"gpio41",
+	"gpio42",
+	"gpio43",
+	"gpio44",
+	"gpio45",
+	"gpio46",
+	"gpio47",
+	"gpio48",
+	"gpio49",
+	"gpio50",
+	"gpio51",
+	"gpio52",
+	"gpio53",
+};
+
+enum bcm2835_fsel {
+	BCM2835_FSEL_GPIO_IN = 0,
+	BCM2835_FSEL_GPIO_OUT = 1,
+	BCM2835_FSEL_ALT0 = 4,
+	BCM2835_FSEL_ALT1 = 5,
+	BCM2835_FSEL_ALT2 = 6,
+	BCM2835_FSEL_ALT3 = 7,
+	BCM2835_FSEL_ALT4 = 3,
+	BCM2835_FSEL_ALT5 = 2,
+	BCM2835_FSEL_COUNT = 8,
+	BCM2835_FSEL_MASK = 0x7,
+};
+
+static const char * const bcm2835_functions[BCM2835_FSEL_COUNT] = {
+	[BCM2835_FSEL_GPIO_IN] = "gpio_in",
+	[BCM2835_FSEL_GPIO_OUT] = "gpio_out",
+	[BCM2835_FSEL_ALT0] = "alt0",
+	[BCM2835_FSEL_ALT1] = "alt1",
+	[BCM2835_FSEL_ALT2] = "alt2",
+	[BCM2835_FSEL_ALT3] = "alt3",
+	[BCM2835_FSEL_ALT4] = "alt4",
+	[BCM2835_FSEL_ALT5] = "alt5",
+};
+
+static const char * const irq_type_names[] = {
+	[IRQ_TYPE_NONE] = "none",
+	[IRQ_TYPE_EDGE_RISING] = "edge-rising",
+	[IRQ_TYPE_EDGE_FALLING] = "edge-falling",
+	[IRQ_TYPE_EDGE_BOTH] = "edge-both",
+	[IRQ_TYPE_LEVEL_HIGH] = "level-high",
+	[IRQ_TYPE_LEVEL_LOW] = "level-low",
+};
+
+static inline u32 bcm2835_gpio_rd(struct bcm2835_pinctrl *pc, unsigned reg)
+{
+	return readl(pc->base + reg);
+}
+
+static inline void bcm2835_gpio_wr(struct bcm2835_pinctrl *pc, unsigned reg,
+		u32 val)
+{
+	writel(val, pc->base + reg);
+}
+
+static inline int bcm2835_gpio_get_bit(struct bcm2835_pinctrl *pc, unsigned reg,
+		unsigned bit)
+{
+	reg += GPIO_REG_OFFSET(bit) * 4;
+	return (bcm2835_gpio_rd(pc, reg) >> GPIO_REG_SHIFT(bit)) & 1;
+}
+
+/* note NOT a read/modify/write cycle */
+static inline void bcm2835_gpio_set_bit(struct bcm2835_pinctrl *pc,
+		unsigned reg, unsigned bit)
+{
+	reg += GPIO_REG_OFFSET(bit) * 4;
+	bcm2835_gpio_wr(pc, reg, BIT(GPIO_REG_SHIFT(bit)));
+}
+
+static inline enum bcm2835_fsel bcm2835_pinctrl_fsel_get(
+		struct bcm2835_pinctrl *pc, unsigned pin)
+{
+	u32 val = bcm2835_gpio_rd(pc, FSEL_REG(pin));
+	enum bcm2835_fsel status = (val >> FSEL_SHIFT(pin)) & BCM2835_FSEL_MASK;
+
+	dev_dbg(pc->dev, "get %08x (%u => %s)\n", val, pin,
+			bcm2835_functions[status]);
+
+	return status;
+}
+
+static inline void bcm2835_pinctrl_fsel_set(
+		struct bcm2835_pinctrl *pc, unsigned pin,
+		enum bcm2835_fsel fsel)
+{
+	u32 val = bcm2835_gpio_rd(pc, FSEL_REG(pin));
+	enum bcm2835_fsel cur = (val >> FSEL_SHIFT(pin)) & BCM2835_FSEL_MASK;
+
+	dev_dbg(pc->dev, "read %08x (%u => %s)\n", val, pin,
+			bcm2835_functions[cur]);
+
+	if (cur == fsel)
+		return;
+
+	if (cur != BCM2835_FSEL_GPIO_IN && fsel != BCM2835_FSEL_GPIO_IN) {
+		/* always transition through GPIO_IN */
+		val &= ~(BCM2835_FSEL_MASK << FSEL_SHIFT(pin));
+		val |= BCM2835_FSEL_GPIO_IN << FSEL_SHIFT(pin);
+
+		dev_dbg(pc->dev, "trans %08x (%u <= %s)\n", val, pin,
+				bcm2835_functions[BCM2835_FSEL_GPIO_IN]);
+		bcm2835_gpio_wr(pc, FSEL_REG(pin), val);
+	}
+
+	val &= ~(BCM2835_FSEL_MASK << FSEL_SHIFT(pin));
+	val |= fsel << FSEL_SHIFT(pin);
+
+	dev_dbg(pc->dev, "write %08x (%u <= %s)\n", val, pin,
+			bcm2835_functions[fsel]);
+	bcm2835_gpio_wr(pc, FSEL_REG(pin), val);
+}
+
+static int bcm2835_gpio_request(struct gpio_chip *chip, unsigned offset)
+{
+	return pinctrl_request_gpio(chip->base + offset);
+}
+
+static void bcm2835_gpio_free(struct gpio_chip *chip, unsigned offset)
+{
+	pinctrl_free_gpio(chip->base + offset);
+}
+
+static int bcm2835_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+	return pinctrl_gpio_direction_input(chip->base + offset);
+}
+
+static int bcm2835_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+	struct bcm2835_pinctrl *pc = dev_get_drvdata(chip->dev);
+
+	return bcm2835_gpio_get_bit(pc, GPLEV0, offset);
+}
+
+static int bcm2835_gpio_direction_output(struct gpio_chip *chip,
+		unsigned offset, int value)
+{
+	return pinctrl_gpio_direction_output(chip->base + offset);
+}
+
+static void bcm2835_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+	struct bcm2835_pinctrl *pc = dev_get_drvdata(chip->dev);
+
+	bcm2835_gpio_set_bit(pc, value ? GPSET0 : GPCLR0, offset);
+}
+
+static int bcm2835_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+	struct bcm2835_pinctrl *pc = dev_get_drvdata(chip->dev);
+
+	return irq_linear_revmap(pc->irq_domain, offset);
+}
+
+static struct gpio_chip bcm2835_gpio_chip = {
+	.label = MODULE_NAME,
+	.owner = THIS_MODULE,
+	.request = bcm2835_gpio_request,
+	.free = bcm2835_gpio_free,
+	.direction_input = bcm2835_gpio_direction_input,
+	.direction_output = bcm2835_gpio_direction_output,
+	.get = bcm2835_gpio_get,
+	.set = bcm2835_gpio_set,
+	.to_irq = bcm2835_gpio_to_irq,
+	.base = -1,
+	.ngpio = BCM2835_NUM_GPIOS,
+	.can_sleep = false,
+};
+
+static irqreturn_t bcm2835_gpio_irq_handler(int irq, void *dev_id)
+{
+	struct bcm2835_gpio_irqdata *irqdata = dev_id;
+	struct bcm2835_pinctrl *pc = irqdata->pc;
+	int bank = irqdata->bank;
+	unsigned long events;
+	unsigned offset;
+	unsigned gpio;
+	unsigned int type;
+
+	events = bcm2835_gpio_rd(pc, GPEDS0 + bank * 4);
+	events &= pc->enabled_irq_map[bank];
+	for_each_set_bit(offset, &events, 32) {
+		gpio = (32 * bank) + offset;
+		type = pc->irq_type[gpio];
+
+		/* ack edge triggered IRQs immediately */
+		if (!(type & IRQ_TYPE_LEVEL_MASK))
+			bcm2835_gpio_set_bit(pc, GPEDS0, gpio);
+
+		generic_handle_irq(irq_linear_revmap(pc->irq_domain, gpio));
+
+		/* ack level triggered IRQ after handling them */
+		if (type & IRQ_TYPE_LEVEL_MASK)
+			bcm2835_gpio_set_bit(pc, GPEDS0, gpio);
+	}
+	return events ? IRQ_HANDLED : IRQ_NONE;
+}
+
+static inline void __bcm2835_gpio_irq_config(struct bcm2835_pinctrl *pc,
+	unsigned reg, unsigned offset, bool enable)
+{
+	u32 value;
+	reg += GPIO_REG_OFFSET(offset) * 4;
+	value = bcm2835_gpio_rd(pc, reg);
+	if (enable)
+		value |= BIT(GPIO_REG_SHIFT(offset));
+	else
+		value &= ~(BIT(GPIO_REG_SHIFT(offset)));
+	bcm2835_gpio_wr(pc, reg, value);
+}
+
+/* fast path for IRQ handler */
+static void bcm2835_gpio_irq_config(struct bcm2835_pinctrl *pc,
+	unsigned offset, bool enable)
+{
+	switch (pc->irq_type[offset]) {
+	case IRQ_TYPE_EDGE_RISING:
+		__bcm2835_gpio_irq_config(pc, GPREN0, offset, enable);
+		break;
+
+	case IRQ_TYPE_EDGE_FALLING:
+		__bcm2835_gpio_irq_config(pc, GPFEN0, offset, enable);
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		__bcm2835_gpio_irq_config(pc, GPREN0, offset, enable);
+		__bcm2835_gpio_irq_config(pc, GPFEN0, offset, enable);
+		break;
+
+	case IRQ_TYPE_LEVEL_HIGH:
+		__bcm2835_gpio_irq_config(pc, GPHEN0, offset, enable);
+		break;
+
+	case IRQ_TYPE_LEVEL_LOW:
+		__bcm2835_gpio_irq_config(pc, GPLEN0, offset, enable);
+		break;
+	}
+}
+
+static void bcm2835_gpio_irq_enable(struct irq_data *data)
+{
+	struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data);
+	unsigned gpio = irqd_to_hwirq(data);
+	unsigned offset = GPIO_REG_SHIFT(gpio);
+	unsigned bank = GPIO_REG_OFFSET(gpio);
+	unsigned long flags;
+
+	spin_lock_irqsave(&pc->irq_lock[bank], flags);
+	set_bit(offset, &pc->enabled_irq_map[bank]);
+	bcm2835_gpio_irq_config(pc, gpio, true);
+	spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
+}
+
+static void bcm2835_gpio_irq_disable(struct irq_data *data)
+{
+	struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data);
+	unsigned gpio = irqd_to_hwirq(data);
+	unsigned offset = GPIO_REG_SHIFT(gpio);
+	unsigned bank = GPIO_REG_OFFSET(gpio);
+	unsigned long flags;
+
+	spin_lock_irqsave(&pc->irq_lock[bank], flags);
+	bcm2835_gpio_irq_config(pc, gpio, false);
+	clear_bit(offset, &pc->enabled_irq_map[bank]);
+	spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
+}
+
+static int __bcm2835_gpio_irq_set_type_disabled(struct bcm2835_pinctrl *pc,
+	unsigned offset, unsigned int type)
+{
+	switch (type) {
+	case IRQ_TYPE_NONE:
+	case IRQ_TYPE_EDGE_RISING:
+	case IRQ_TYPE_EDGE_FALLING:
+	case IRQ_TYPE_EDGE_BOTH:
+	case IRQ_TYPE_LEVEL_HIGH:
+	case IRQ_TYPE_LEVEL_LOW:
+		pc->irq_type[offset] = type;
+		break;
+
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+/* slower path for reconfiguring IRQ type */
+static int __bcm2835_gpio_irq_set_type_enabled(struct bcm2835_pinctrl *pc,
+	unsigned offset, unsigned int type)
+{
+	switch (type) {
+	case IRQ_TYPE_NONE:
+		if (pc->irq_type[offset] != type) {
+			bcm2835_gpio_irq_config(pc, offset, false);
+			pc->irq_type[offset] = type;
+		}
+		break;
+
+	case IRQ_TYPE_EDGE_RISING:
+		if (pc->irq_type[offset] == IRQ_TYPE_EDGE_BOTH) {
+			/* RISING already enabled, disable FALLING */
+			pc->irq_type[offset] = IRQ_TYPE_EDGE_FALLING;
+			bcm2835_gpio_irq_config(pc, offset, false);
+			pc->irq_type[offset] = type;
+		} else if (pc->irq_type[offset] != type) {
+			bcm2835_gpio_irq_config(pc, offset, false);
+			pc->irq_type[offset] = type;
+			bcm2835_gpio_irq_config(pc, offset, true);
+		}
+		break;
+
+	case IRQ_TYPE_EDGE_FALLING:
+		if (pc->irq_type[offset] == IRQ_TYPE_EDGE_BOTH) {
+			/* FALLING already enabled, disable RISING */
+			pc->irq_type[offset] = IRQ_TYPE_EDGE_RISING;
+			bcm2835_gpio_irq_config(pc, offset, false);
+			pc->irq_type[offset] = type;
+		} else if (pc->irq_type[offset] != type) {
+			bcm2835_gpio_irq_config(pc, offset, false);
+			pc->irq_type[offset] = type;
+			bcm2835_gpio_irq_config(pc, offset, true);
+		}
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		if (pc->irq_type[offset] == IRQ_TYPE_EDGE_RISING) {
+			/* RISING already enabled, enable FALLING too */
+			pc->irq_type[offset] = IRQ_TYPE_EDGE_FALLING;
+			bcm2835_gpio_irq_config(pc, offset, true);
+			pc->irq_type[offset] = type;
+		} else if (pc->irq_type[offset] == IRQ_TYPE_EDGE_FALLING) {
+			/* FALLING already enabled, enable RISING too */
+			pc->irq_type[offset] = IRQ_TYPE_EDGE_RISING;
+			bcm2835_gpio_irq_config(pc, offset, true);
+			pc->irq_type[offset] = type;
+		} else if (pc->irq_type[offset] != type) {
+			bcm2835_gpio_irq_config(pc, offset, false);
+			pc->irq_type[offset] = type;
+			bcm2835_gpio_irq_config(pc, offset, true);
+		}
+		break;
+
+	case IRQ_TYPE_LEVEL_HIGH:
+	case IRQ_TYPE_LEVEL_LOW:
+		if (pc->irq_type[offset] != type) {
+			bcm2835_gpio_irq_config(pc, offset, false);
+			pc->irq_type[offset] = type;
+			bcm2835_gpio_irq_config(pc, offset, true);
+		}
+		break;
+
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int bcm2835_gpio_irq_set_type(struct irq_data *data, unsigned int type)
+{
+	struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data);
+	unsigned gpio = irqd_to_hwirq(data);
+	unsigned offset = GPIO_REG_SHIFT(gpio);
+	unsigned bank = GPIO_REG_OFFSET(gpio);
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&pc->irq_lock[bank], flags);
+
+	if (test_bit(offset, &pc->enabled_irq_map[bank]))
+		ret = __bcm2835_gpio_irq_set_type_enabled(pc, gpio, type);
+	else
+		ret = __bcm2835_gpio_irq_set_type_disabled(pc, gpio, type);
+
+	spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
+
+	return ret;
+}
+
+static struct irq_chip bcm2835_gpio_irq_chip = {
+	.name = MODULE_NAME,
+	.irq_enable = bcm2835_gpio_irq_enable,
+	.irq_disable = bcm2835_gpio_irq_disable,
+	.irq_set_type = bcm2835_gpio_irq_set_type,
+};
+
+static int bcm2835_pctl_get_groups_count(struct pinctrl_dev *pctldev)
+{
+	return ARRAY_SIZE(bcm2835_gpio_groups);
+}
+
+static const char *bcm2835_pctl_get_group_name(struct pinctrl_dev *pctldev,
+		unsigned selector)
+{
+	return bcm2835_gpio_groups[selector];
+}
+
+static int bcm2835_pctl_get_group_pins(struct pinctrl_dev *pctldev,
+		unsigned selector,
+		const unsigned **pins,
+		unsigned *num_pins)
+{
+	*pins = &bcm2835_gpio_pins[selector].number;
+	*num_pins = 1;
+
+	return 0;
+}
+
+static void bcm2835_pctl_pin_dbg_show(struct pinctrl_dev *pctldev,
+		struct seq_file *s,
+		unsigned offset)
+{
+	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
+	enum bcm2835_fsel fsel = bcm2835_pinctrl_fsel_get(pc, offset);
+	const char *fname = bcm2835_functions[fsel];
+	int value = bcm2835_gpio_get_bit(pc, GPLEV0, offset);
+	int irq = irq_find_mapping(pc->irq_domain, offset);
+
+	seq_printf(s, "function %s in %s; irq %d (%s)",
+		fname, value ? "hi" : "lo",
+		irq, irq_type_names[pc->irq_type[offset]]);
+}
+
+static void bcm2835_pctl_dt_free_map(struct pinctrl_dev *pctldev,
+		struct pinctrl_map *maps, unsigned num_maps)
+{
+	int i;
+
+	for (i = 0; i < num_maps; i++)
+		if (maps[i].type == PIN_MAP_TYPE_CONFIGS_PIN)
+			kfree(maps[i].data.configs.configs);
+
+	kfree(maps);
+}
+
+static int bcm2835_pctl_dt_node_to_map_func(struct bcm2835_pinctrl *pc,
+		struct device_node *np, u32 pin, u32 fnum,
+		struct pinctrl_map **maps)
+{
+	struct pinctrl_map *map = *maps;
+
+	if (fnum >= ARRAY_SIZE(bcm2835_functions)) {
+		dev_err(pc->dev, "%s: invalid brcm,function %d\n",
+			of_node_full_name(np), fnum);
+		return -EINVAL;
+	}
+
+	map->type = PIN_MAP_TYPE_MUX_GROUP;
+	map->data.mux.group = bcm2835_gpio_groups[pin];
+	map->data.mux.function = bcm2835_functions[fnum];
+	(*maps)++;
+
+	return 0;
+}
+
+static int bcm2835_pctl_dt_node_to_map_pull(struct bcm2835_pinctrl *pc,
+		struct device_node *np, u32 pin, u32 pull,
+		struct pinctrl_map **maps)
+{
+	struct pinctrl_map *map = *maps;
+	unsigned long *configs;
+
+	if (pull > 2) {
+		dev_err(pc->dev, "%s: invalid brcm,pull %d\n",
+			of_node_full_name(np), pull);
+		return -EINVAL;
+	}
+
+	configs = kzalloc(sizeof(*configs), GFP_KERNEL);
+	if (!configs)
+		return -ENOMEM;
+	configs[0] = BCM2835_PINCONF_PACK(BCM2835_PINCONF_PARAM_PULL, pull);
+
+	map->type = PIN_MAP_TYPE_CONFIGS_PIN;
+	map->data.configs.group_or_pin = bcm2835_gpio_pins[pin].name;
+	map->data.configs.configs = configs;
+	map->data.configs.num_configs = 1;
+	(*maps)++;
+
+	return 0;
+}
+
+static int bcm2835_pctl_dt_node_to_map(struct pinctrl_dev *pctldev,
+		struct device_node *np,
+		struct pinctrl_map **map, unsigned *num_maps)
+{
+	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
+	struct property *pins, *funcs, *pulls;
+	int num_pins, num_funcs, num_pulls, maps_per_pin;
+	struct pinctrl_map *maps, *cur_map;
+	int i, err;
+	u32 pin, func, pull;
+
+	pins = of_find_property(np, "brcm,pins", NULL);
+	if (!pins) {
+		dev_err(pc->dev, "%s: missing brcm,pins property\n",
+				of_node_full_name(np));
+		return -EINVAL;
+	}
+
+	funcs = of_find_property(np, "brcm,function", NULL);
+	pulls = of_find_property(np, "brcm,pull", NULL);
+
+	if (!funcs && !pulls) {
+		dev_err(pc->dev,
+			"%s: neither brcm,function nor brcm,pull specified\n",
+			of_node_full_name(np));
+		return -EINVAL;
+	}
+
+	num_pins = pins->length / 4;
+	num_funcs = funcs ? (funcs->length / 4) : 0;
+	num_pulls = pulls ? (pulls->length / 4) : 0;
+
+	if (num_funcs > 1 && num_funcs != num_pins) {
+		dev_err(pc->dev,
+			"%s: brcm,function must have 1 or %d entries\n",
+			of_node_full_name(np), num_pins);
+		return -EINVAL;
+	}
+
+	if (num_pulls > 1 && num_pulls != num_pins) {
+		dev_err(pc->dev,
+			"%s: brcm,pull must have 1 or %d entries\n",
+			of_node_full_name(np), num_pins);
+		return -EINVAL;
+	}
+
+	maps_per_pin = 0;
+	if (num_funcs)
+		maps_per_pin++;
+	if (num_pulls)
+		maps_per_pin++;
+	cur_map = maps = kzalloc(num_pins * maps_per_pin * sizeof(*maps),
+				GFP_KERNEL);
+	if (!maps)
+		return -ENOMEM;
+
+	for (i = 0; i < num_pins; i++) {
+		err = of_property_read_u32_index(np, "brcm,pins", i, &pin);
+		if (err)
+			goto out;
+		if (pin >= ARRAY_SIZE(bcm2835_gpio_pins)) {
+			dev_err(pc->dev, "%s: invalid brcm,pins value %d\n",
+				of_node_full_name(np), pin);
+			err = -EINVAL;
+			goto out;
+		}
+
+		if (num_funcs) {
+			err = of_property_read_u32_index(np, "brcm,function",
+					(num_funcs > 1) ? i : 0, &func);
+			if (err)
+				goto out;
+			err = bcm2835_pctl_dt_node_to_map_func(pc, np, pin,
+							func, &cur_map);
+			if (err)
+				goto out;
+		}
+		if (num_pulls) {
+			err = of_property_read_u32_index(np, "brcm,pull",
+					(num_funcs > 1) ? i : 0, &pull);
+			if (err)
+				goto out;
+			err = bcm2835_pctl_dt_node_to_map_pull(pc, np, pin,
+							pull, &cur_map);
+			if (err)
+				goto out;
+		}
+	}
+
+	*map = maps;
+	*num_maps = num_pins * maps_per_pin;
+
+	return 0;
+
+out:
+	kfree(maps);
+	return err;
+}
+
+static const struct pinctrl_ops bcm2835_pctl_ops = {
+	.get_groups_count = bcm2835_pctl_get_groups_count,
+	.get_group_name = bcm2835_pctl_get_group_name,
+	.get_group_pins = bcm2835_pctl_get_group_pins,
+	.pin_dbg_show = bcm2835_pctl_pin_dbg_show,
+	.dt_node_to_map = bcm2835_pctl_dt_node_to_map,
+	.dt_free_map = bcm2835_pctl_dt_free_map,
+};
+
+static int bcm2835_pmx_get_functions_count(struct pinctrl_dev *pctldev)
+{
+	return BCM2835_FSEL_COUNT;
+}
+
+static const char *bcm2835_pmx_get_function_name(struct pinctrl_dev *pctldev,
+		unsigned selector)
+{
+	return bcm2835_functions[selector];
+}
+
+static int bcm2835_pmx_get_function_groups(struct pinctrl_dev *pctldev,
+		unsigned selector,
+		const char * const **groups,
+		unsigned * const num_groups)
+{
+	/* every pin can do every function */
+	*groups = bcm2835_gpio_groups;
+	*num_groups = ARRAY_SIZE(bcm2835_gpio_groups);
+
+	return 0;
+}
+
+static int bcm2835_pmx_set(struct pinctrl_dev *pctldev,
+		unsigned func_selector,
+		unsigned group_selector)
+{
+	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
+
+	bcm2835_pinctrl_fsel_set(pc, group_selector, func_selector);
+
+	return 0;
+}
+
+static void bcm2835_pmx_gpio_disable_free(struct pinctrl_dev *pctldev,
+		struct pinctrl_gpio_range *range,
+		unsigned offset)
+{
+	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
+
+	/* disable by setting to GPIO_IN */
+	bcm2835_pinctrl_fsel_set(pc, offset, BCM2835_FSEL_GPIO_IN);
+}
+
+static int bcm2835_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
+		struct pinctrl_gpio_range *range,
+		unsigned offset,
+		bool input)
+{
+	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
+	enum bcm2835_fsel fsel = input ?
+		BCM2835_FSEL_GPIO_IN : BCM2835_FSEL_GPIO_OUT;
+
+	bcm2835_pinctrl_fsel_set(pc, offset, fsel);
+
+	return 0;
+}
+
+static const struct pinmux_ops bcm2835_pmx_ops = {
+	.get_functions_count = bcm2835_pmx_get_functions_count,
+	.get_function_name = bcm2835_pmx_get_function_name,
+	.get_function_groups = bcm2835_pmx_get_function_groups,
+	.set_mux = bcm2835_pmx_set,
+	.gpio_disable_free = bcm2835_pmx_gpio_disable_free,
+	.gpio_set_direction = bcm2835_pmx_gpio_set_direction,
+};
+
+static int bcm2835_pinconf_get(struct pinctrl_dev *pctldev,
+			unsigned pin, unsigned long *config)
+{
+	/* No way to read back config in HW */
+	return -ENOTSUPP;
+}
+
+static int bcm2835_pinconf_set(struct pinctrl_dev *pctldev,
+			unsigned pin, unsigned long *configs,
+			unsigned num_configs)
+{
+	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
+	enum bcm2835_pinconf_param param;
+	u16 arg;
+	u32 off, bit;
+	int i;
+
+	for (i = 0; i < num_configs; i++) {
+		param = BCM2835_PINCONF_UNPACK_PARAM(configs[i]);
+		arg = BCM2835_PINCONF_UNPACK_ARG(configs[i]);
+
+		if (param != BCM2835_PINCONF_PARAM_PULL)
+			return -EINVAL;
+
+		off = GPIO_REG_OFFSET(pin);
+		bit = GPIO_REG_SHIFT(pin);
+
+		bcm2835_gpio_wr(pc, GPPUD, arg & 3);
+		/*
+		 * Docs say to wait 150 cycles, but not of what. We assume a
+		 * 1 MHz clock here, which is pretty slow...
+		 */
+		udelay(150);
+		bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), BIT(bit));
+		udelay(150);
+		bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), 0);
+	} /* for each config */
+
+	return 0;
+}
+
+static const struct pinconf_ops bcm2835_pinconf_ops = {
+	.pin_config_get = bcm2835_pinconf_get,
+	.pin_config_set = bcm2835_pinconf_set,
+};
+
+static struct pinctrl_desc bcm2835_pinctrl_desc = {
+	.name = MODULE_NAME,
+	.pins = bcm2835_gpio_pins,
+	.npins = ARRAY_SIZE(bcm2835_gpio_pins),
+	.pctlops = &bcm2835_pctl_ops,
+	.pmxops = &bcm2835_pmx_ops,
+	.confops = &bcm2835_pinconf_ops,
+	.owner = THIS_MODULE,
+};
+
+static struct pinctrl_gpio_range bcm2835_pinctrl_gpio_range = {
+	.name = MODULE_NAME,
+	.npins = BCM2835_NUM_GPIOS,
+};
+
+static int bcm2835_pinctrl_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct bcm2835_pinctrl *pc;
+	struct resource iomem;
+	int err, i;
+	BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_pins) != BCM2835_NUM_GPIOS);
+	BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_groups) != BCM2835_NUM_GPIOS);
+
+	pc = devm_kzalloc(dev, sizeof(*pc), GFP_KERNEL);
+	if (!pc)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, pc);
+	pc->dev = dev;
+
+	err = of_address_to_resource(np, 0, &iomem);
+	if (err) {
+		dev_err(dev, "could not get IO memory\n");
+		return err;
+	}
+
+	pc->base = devm_ioremap_resource(dev, &iomem);
+	if (IS_ERR(pc->base))
+		return PTR_ERR(pc->base);
+
+	pc->gpio_chip = bcm2835_gpio_chip;
+	pc->gpio_chip.dev = dev;
+	pc->gpio_chip.of_node = np;
+
+	pc->irq_domain = irq_domain_add_linear(np, BCM2835_NUM_GPIOS,
+			&irq_domain_simple_ops, NULL);
+	if (!pc->irq_domain) {
+		dev_err(dev, "could not create IRQ domain\n");
+		return -ENOMEM;
+	}
+
+	for (i = 0; i < BCM2835_NUM_GPIOS; i++) {
+		int irq = irq_create_mapping(pc->irq_domain, i);
+		irq_set_lockdep_class(irq, &gpio_lock_class);
+		irq_set_chip_and_handler(irq, &bcm2835_gpio_irq_chip,
+				handle_simple_irq);
+		irq_set_chip_data(irq, pc);
+		set_irq_flags(irq, IRQF_VALID);
+	}
+
+	for (i = 0; i < BCM2835_NUM_BANKS; i++) {
+		unsigned long events;
+		unsigned offset;
+		int len;
+		char *name;
+
+		/* clear event detection flags */
+		bcm2835_gpio_wr(pc, GPREN0 + i * 4, 0);
+		bcm2835_gpio_wr(pc, GPFEN0 + i * 4, 0);
+		bcm2835_gpio_wr(pc, GPHEN0 + i * 4, 0);
+		bcm2835_gpio_wr(pc, GPLEN0 + i * 4, 0);
+		bcm2835_gpio_wr(pc, GPAREN0 + i * 4, 0);
+		bcm2835_gpio_wr(pc, GPAFEN0 + i * 4, 0);
+
+		/* clear all the events */
+		events = bcm2835_gpio_rd(pc, GPEDS0 + i * 4);
+		for_each_set_bit(offset, &events, 32)
+			bcm2835_gpio_wr(pc, GPEDS0 + i * 4, BIT(offset));
+
+		pc->irq[i] = irq_of_parse_and_map(np, i);
+		pc->irq_data[i].pc = pc;
+		pc->irq_data[i].bank = i;
+		spin_lock_init(&pc->irq_lock[i]);
+
+		len = strlen(dev_name(pc->dev)) + 16;
+		name = devm_kzalloc(pc->dev, len, GFP_KERNEL);
+		if (!name)
+			return -ENOMEM;
+		snprintf(name, len, "%s:bank%d", dev_name(pc->dev), i);
+
+		err = devm_request_irq(dev, pc->irq[i],
+			bcm2835_gpio_irq_handler, IRQF_SHARED,
+			name, &pc->irq_data[i]);
+		if (err) {
+			dev_err(dev, "unable to request IRQ %d\n", pc->irq[i]);
+			return err;
+		}
+	}
+
+	err = gpiochip_add(&pc->gpio_chip);
+	if (err) {
+		dev_err(dev, "could not add GPIO chip\n");
+		return err;
+	}
+
+	pc->pctl_dev = pinctrl_register(&bcm2835_pinctrl_desc, dev, pc);
+	if (!pc->pctl_dev) {
+		gpiochip_remove(&pc->gpio_chip);
+		return -EINVAL;
+	}
+
+	pc->gpio_range = bcm2835_pinctrl_gpio_range;
+	pc->gpio_range.base = pc->gpio_chip.base;
+	pc->gpio_range.gc = &pc->gpio_chip;
+	pinctrl_add_gpio_range(pc->pctl_dev, &pc->gpio_range);
+
+	return 0;
+}
+
+static int bcm2835_pinctrl_remove(struct platform_device *pdev)
+{
+	struct bcm2835_pinctrl *pc = platform_get_drvdata(pdev);
+
+	pinctrl_unregister(pc->pctl_dev);
+	gpiochip_remove(&pc->gpio_chip);
+
+	return 0;
+}
+
+static struct of_device_id bcm2835_pinctrl_match[] = {
+	{ .compatible = "brcm,bcm2835-gpio" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, bcm2835_pinctrl_match);
+
+static struct platform_driver bcm2835_pinctrl_driver = {
+	.probe = bcm2835_pinctrl_probe,
+	.remove = bcm2835_pinctrl_remove,
+	.driver = {
+		.name = MODULE_NAME,
+		.of_match_table = bcm2835_pinctrl_match,
+	},
+};
+module_platform_driver(bcm2835_pinctrl_driver);
+
+MODULE_AUTHOR("Chris Boot, Simon Arlott, Stephen Warren");
+MODULE_DESCRIPTION("BCM2835 Pin control driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/pinctrl/pinctrl-bcm281xx.c b/drivers/pinctrl/pinctrl-bcm281xx.c
deleted file mode 100644
index fa2a00f..0000000
--- a/drivers/pinctrl/pinctrl-bcm281xx.c
+++ /dev/null
@@ -1,1455 +0,0 @@
-/*
- * Copyright (C) 2013 Broadcom Corporation
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation version 2.
- *
- * This program is distributed "as is" WITHOUT ANY WARRANTY of any
- * kind, whether express or implied; without even the implied warranty
- * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
-#include <linux/err.h>
-#include <linux/io.h>
-#include <linux/module.h>
-#include <linux/of.h>
-#include <linux/platform_device.h>
-#include <linux/pinctrl/pinctrl.h>
-#include <linux/pinctrl/pinmux.h>
-#include <linux/pinctrl/pinconf.h>
-#include <linux/pinctrl/pinconf-generic.h>
-#include <linux/regmap.h>
-#include <linux/slab.h>
-#include "core.h"
-#include "pinctrl-utils.h"
-
-/* BCM281XX Pin Control Registers Definitions */
-
-/* Function Select bits are the same for all pin control registers */
-#define BCM281XX_PIN_REG_F_SEL_MASK		0x0700
-#define BCM281XX_PIN_REG_F_SEL_SHIFT		8
-
-/* Standard pin register */
-#define BCM281XX_STD_PIN_REG_DRV_STR_MASK	0x0007
-#define BCM281XX_STD_PIN_REG_DRV_STR_SHIFT	0
-#define BCM281XX_STD_PIN_REG_INPUT_DIS_MASK	0x0008
-#define BCM281XX_STD_PIN_REG_INPUT_DIS_SHIFT	3
-#define BCM281XX_STD_PIN_REG_SLEW_MASK		0x0010
-#define BCM281XX_STD_PIN_REG_SLEW_SHIFT		4
-#define BCM281XX_STD_PIN_REG_PULL_UP_MASK	0x0020
-#define BCM281XX_STD_PIN_REG_PULL_UP_SHIFT	5
-#define BCM281XX_STD_PIN_REG_PULL_DN_MASK	0x0040
-#define BCM281XX_STD_PIN_REG_PULL_DN_SHIFT	6
-#define BCM281XX_STD_PIN_REG_HYST_MASK		0x0080
-#define BCM281XX_STD_PIN_REG_HYST_SHIFT		7
-
-/* I2C pin register */
-#define BCM281XX_I2C_PIN_REG_INPUT_DIS_MASK	0x0004
-#define BCM281XX_I2C_PIN_REG_INPUT_DIS_SHIFT	2
-#define BCM281XX_I2C_PIN_REG_SLEW_MASK		0x0008
-#define BCM281XX_I2C_PIN_REG_SLEW_SHIFT		3
-#define BCM281XX_I2C_PIN_REG_PULL_UP_STR_MASK	0x0070
-#define BCM281XX_I2C_PIN_REG_PULL_UP_STR_SHIFT	4
-
-/* HDMI pin register */
-#define BCM281XX_HDMI_PIN_REG_INPUT_DIS_MASK	0x0008
-#define BCM281XX_HDMI_PIN_REG_INPUT_DIS_SHIFT	3
-#define BCM281XX_HDMI_PIN_REG_MODE_MASK		0x0010
-#define BCM281XX_HDMI_PIN_REG_MODE_SHIFT	4
-
-/**
- * bcm281xx_pin_type - types of pin register
- */
-enum bcm281xx_pin_type {
-	BCM281XX_PIN_TYPE_UNKNOWN = 0,
-	BCM281XX_PIN_TYPE_STD,
-	BCM281XX_PIN_TYPE_I2C,
-	BCM281XX_PIN_TYPE_HDMI,
-};
-
-static enum bcm281xx_pin_type std_pin = BCM281XX_PIN_TYPE_STD;
-static enum bcm281xx_pin_type i2c_pin = BCM281XX_PIN_TYPE_I2C;
-static enum bcm281xx_pin_type hdmi_pin = BCM281XX_PIN_TYPE_HDMI;
-
-/**
- * bcm281xx_pin_function- define pin function
- */
-struct bcm281xx_pin_function {
-	const char *name;
-	const char * const *groups;
-	const unsigned ngroups;
-};
-
-/**
- * bcm281xx_pinctrl_data - Broadcom-specific pinctrl data
- * @reg_base - base of pinctrl registers
- */
-struct bcm281xx_pinctrl_data {
-	void __iomem *reg_base;
-
-	/* List of all pins */
-	const struct pinctrl_pin_desc *pins;
-	const unsigned npins;
-
-	const struct bcm281xx_pin_function *functions;
-	const unsigned nfunctions;
-
-	struct regmap *regmap;
-};
-
-/*
- * Pin number definition.  The order here must be the same as defined in the
- * PADCTRLREG block in the RDB.
- */
-#define BCM281XX_PIN_ADCSYNC		0
-#define BCM281XX_PIN_BAT_RM		1
-#define BCM281XX_PIN_BSC1_SCL		2
-#define BCM281XX_PIN_BSC1_SDA		3
-#define BCM281XX_PIN_BSC2_SCL		4
-#define BCM281XX_PIN_BSC2_SDA		5
-#define BCM281XX_PIN_CLASSGPWR		6
-#define BCM281XX_PIN_CLK_CX8		7
-#define BCM281XX_PIN_CLKOUT_0		8
-#define BCM281XX_PIN_CLKOUT_1		9
-#define BCM281XX_PIN_CLKOUT_2		10
-#define BCM281XX_PIN_CLKOUT_3		11
-#define BCM281XX_PIN_CLKREQ_IN_0	12
-#define BCM281XX_PIN_CLKREQ_IN_1	13
-#define BCM281XX_PIN_CWS_SYS_REQ1	14
-#define BCM281XX_PIN_CWS_SYS_REQ2	15
-#define BCM281XX_PIN_CWS_SYS_REQ3	16
-#define BCM281XX_PIN_DIGMIC1_CLK	17
-#define BCM281XX_PIN_DIGMIC1_DQ		18
-#define BCM281XX_PIN_DIGMIC2_CLK	19
-#define BCM281XX_PIN_DIGMIC2_DQ		20
-#define BCM281XX_PIN_GPEN13		21
-#define BCM281XX_PIN_GPEN14		22
-#define BCM281XX_PIN_GPEN15		23
-#define BCM281XX_PIN_GPIO00		24
-#define BCM281XX_PIN_GPIO01		25
-#define BCM281XX_PIN_GPIO02		26
-#define BCM281XX_PIN_GPIO03		27
-#define BCM281XX_PIN_GPIO04		28
-#define BCM281XX_PIN_GPIO05		29
-#define BCM281XX_PIN_GPIO06		30
-#define BCM281XX_PIN_GPIO07		31
-#define BCM281XX_PIN_GPIO08		32
-#define BCM281XX_PIN_GPIO09		33
-#define BCM281XX_PIN_GPIO10		34
-#define BCM281XX_PIN_GPIO11		35
-#define BCM281XX_PIN_GPIO12		36
-#define BCM281XX_PIN_GPIO13		37
-#define BCM281XX_PIN_GPIO14		38
-#define BCM281XX_PIN_GPS_PABLANK	39
-#define BCM281XX_PIN_GPS_TMARK		40
-#define BCM281XX_PIN_HDMI_SCL		41
-#define BCM281XX_PIN_HDMI_SDA		42
-#define BCM281XX_PIN_IC_DM		43
-#define BCM281XX_PIN_IC_DP		44
-#define BCM281XX_PIN_KP_COL_IP_0	45
-#define BCM281XX_PIN_KP_COL_IP_1	46
-#define BCM281XX_PIN_KP_COL_IP_2	47
-#define BCM281XX_PIN_KP_COL_IP_3	48
-#define BCM281XX_PIN_KP_ROW_OP_0	49
-#define BCM281XX_PIN_KP_ROW_OP_1	50
-#define BCM281XX_PIN_KP_ROW_OP_2	51
-#define BCM281XX_PIN_KP_ROW_OP_3	52
-#define BCM281XX_PIN_LCD_B_0		53
-#define BCM281XX_PIN_LCD_B_1		54
-#define BCM281XX_PIN_LCD_B_2		55
-#define BCM281XX_PIN_LCD_B_3		56
-#define BCM281XX_PIN_LCD_B_4		57
-#define BCM281XX_PIN_LCD_B_5		58
-#define BCM281XX_PIN_LCD_B_6		59
-#define BCM281XX_PIN_LCD_B_7		60
-#define BCM281XX_PIN_LCD_G_0		61
-#define BCM281XX_PIN_LCD_G_1		62
-#define BCM281XX_PIN_LCD_G_2		63
-#define BCM281XX_PIN_LCD_G_3		64
-#define BCM281XX_PIN_LCD_G_4		65
-#define BCM281XX_PIN_LCD_G_5		66
-#define BCM281XX_PIN_LCD_G_6		67
-#define BCM281XX_PIN_LCD_G_7		68
-#define BCM281XX_PIN_LCD_HSYNC		69
-#define BCM281XX_PIN_LCD_OE		70
-#define BCM281XX_PIN_LCD_PCLK		71
-#define BCM281XX_PIN_LCD_R_0		72
-#define BCM281XX_PIN_LCD_R_1		73
-#define BCM281XX_PIN_LCD_R_2		74
-#define BCM281XX_PIN_LCD_R_3		75
-#define BCM281XX_PIN_LCD_R_4		76
-#define BCM281XX_PIN_LCD_R_5		77
-#define BCM281XX_PIN_LCD_R_6		78
-#define BCM281XX_PIN_LCD_R_7		79
-#define BCM281XX_PIN_LCD_VSYNC		80
-#define BCM281XX_PIN_MDMGPIO0		81
-#define BCM281XX_PIN_MDMGPIO1		82
-#define BCM281XX_PIN_MDMGPIO2		83
-#define BCM281XX_PIN_MDMGPIO3		84
-#define BCM281XX_PIN_MDMGPIO4		85
-#define BCM281XX_PIN_MDMGPIO5		86
-#define BCM281XX_PIN_MDMGPIO6		87
-#define BCM281XX_PIN_MDMGPIO7		88
-#define BCM281XX_PIN_MDMGPIO8		89
-#define BCM281XX_PIN_MPHI_DATA_0	90
-#define BCM281XX_PIN_MPHI_DATA_1	91
-#define BCM281XX_PIN_MPHI_DATA_2	92
-#define BCM281XX_PIN_MPHI_DATA_3	93
-#define BCM281XX_PIN_MPHI_DATA_4	94
-#define BCM281XX_PIN_MPHI_DATA_5	95
-#define BCM281XX_PIN_MPHI_DATA_6	96
-#define BCM281XX_PIN_MPHI_DATA_7	97
-#define BCM281XX_PIN_MPHI_DATA_8	98
-#define BCM281XX_PIN_MPHI_DATA_9	99
-#define BCM281XX_PIN_MPHI_DATA_10	100
-#define BCM281XX_PIN_MPHI_DATA_11	101
-#define BCM281XX_PIN_MPHI_DATA_12	102
-#define BCM281XX_PIN_MPHI_DATA_13	103
-#define BCM281XX_PIN_MPHI_DATA_14	104
-#define BCM281XX_PIN_MPHI_DATA_15	105
-#define BCM281XX_PIN_MPHI_HA0		106
-#define BCM281XX_PIN_MPHI_HAT0		107
-#define BCM281XX_PIN_MPHI_HAT1		108
-#define BCM281XX_PIN_MPHI_HCE0_N	109
-#define BCM281XX_PIN_MPHI_HCE1_N	110
-#define BCM281XX_PIN_MPHI_HRD_N		111
-#define BCM281XX_PIN_MPHI_HWR_N		112
-#define BCM281XX_PIN_MPHI_RUN0		113
-#define BCM281XX_PIN_MPHI_RUN1		114
-#define BCM281XX_PIN_MTX_SCAN_CLK	115
-#define BCM281XX_PIN_MTX_SCAN_DATA	116
-#define BCM281XX_PIN_NAND_AD_0		117
-#define BCM281XX_PIN_NAND_AD_1		118
-#define BCM281XX_PIN_NAND_AD_2		119
-#define BCM281XX_PIN_NAND_AD_3		120
-#define BCM281XX_PIN_NAND_AD_4		121
-#define BCM281XX_PIN_NAND_AD_5		122
-#define BCM281XX_PIN_NAND_AD_6		123
-#define BCM281XX_PIN_NAND_AD_7		124
-#define BCM281XX_PIN_NAND_ALE		125
-#define BCM281XX_PIN_NAND_CEN_0		126
-#define BCM281XX_PIN_NAND_CEN_1		127
-#define BCM281XX_PIN_NAND_CLE		128
-#define BCM281XX_PIN_NAND_OEN		129
-#define BCM281XX_PIN_NAND_RDY_0		130
-#define BCM281XX_PIN_NAND_RDY_1		131
-#define BCM281XX_PIN_NAND_WEN		132
-#define BCM281XX_PIN_NAND_WP		133
-#define BCM281XX_PIN_PC1		134
-#define BCM281XX_PIN_PC2		135
-#define BCM281XX_PIN_PMU_INT		136
-#define BCM281XX_PIN_PMU_SCL		137
-#define BCM281XX_PIN_PMU_SDA		138
-#define BCM281XX_PIN_RFST2G_MTSLOTEN3G	139
-#define BCM281XX_PIN_RGMII_0_RX_CTL	140
-#define BCM281XX_PIN_RGMII_0_RXC	141
-#define BCM281XX_PIN_RGMII_0_RXD_0	142
-#define BCM281XX_PIN_RGMII_0_RXD_1	143
-#define BCM281XX_PIN_RGMII_0_RXD_2	144
-#define BCM281XX_PIN_RGMII_0_RXD_3	145
-#define BCM281XX_PIN_RGMII_0_TX_CTL	146
-#define BCM281XX_PIN_RGMII_0_TXC	147
-#define BCM281XX_PIN_RGMII_0_TXD_0	148
-#define BCM281XX_PIN_RGMII_0_TXD_1	149
-#define BCM281XX_PIN_RGMII_0_TXD_2	150
-#define BCM281XX_PIN_RGMII_0_TXD_3	151
-#define BCM281XX_PIN_RGMII_1_RX_CTL	152
-#define BCM281XX_PIN_RGMII_1_RXC	153
-#define BCM281XX_PIN_RGMII_1_RXD_0	154
-#define BCM281XX_PIN_RGMII_1_RXD_1	155
-#define BCM281XX_PIN_RGMII_1_RXD_2	156
-#define BCM281XX_PIN_RGMII_1_RXD_3	157
-#define BCM281XX_PIN_RGMII_1_TX_CTL	158
-#define BCM281XX_PIN_RGMII_1_TXC	159
-#define BCM281XX_PIN_RGMII_1_TXD_0	160
-#define BCM281XX_PIN_RGMII_1_TXD_1	161
-#define BCM281XX_PIN_RGMII_1_TXD_2	162
-#define BCM281XX_PIN_RGMII_1_TXD_3	163
-#define BCM281XX_PIN_RGMII_GPIO_0	164
-#define BCM281XX_PIN_RGMII_GPIO_1	165
-#define BCM281XX_PIN_RGMII_GPIO_2	166
-#define BCM281XX_PIN_RGMII_GPIO_3	167
-#define BCM281XX_PIN_RTXDATA2G_TXDATA3G1	168
-#define BCM281XX_PIN_RTXEN2G_TXDATA3G2	169
-#define BCM281XX_PIN_RXDATA3G0		170
-#define BCM281XX_PIN_RXDATA3G1		171
-#define BCM281XX_PIN_RXDATA3G2		172
-#define BCM281XX_PIN_SDIO1_CLK		173
-#define BCM281XX_PIN_SDIO1_CMD		174
-#define BCM281XX_PIN_SDIO1_DATA_0	175
-#define BCM281XX_PIN_SDIO1_DATA_1	176
-#define BCM281XX_PIN_SDIO1_DATA_2	177
-#define BCM281XX_PIN_SDIO1_DATA_3	178
-#define BCM281XX_PIN_SDIO4_CLK		179
-#define BCM281XX_PIN_SDIO4_CMD		180
-#define BCM281XX_PIN_SDIO4_DATA_0	181
-#define BCM281XX_PIN_SDIO4_DATA_1	182
-#define BCM281XX_PIN_SDIO4_DATA_2	183
-#define BCM281XX_PIN_SDIO4_DATA_3	184
-#define BCM281XX_PIN_SIM_CLK		185
-#define BCM281XX_PIN_SIM_DATA		186
-#define BCM281XX_PIN_SIM_DET		187
-#define BCM281XX_PIN_SIM_RESETN		188
-#define BCM281XX_PIN_SIM2_CLK		189
-#define BCM281XX_PIN_SIM2_DATA		190
-#define BCM281XX_PIN_SIM2_DET		191
-#define BCM281XX_PIN_SIM2_RESETN	192
-#define BCM281XX_PIN_SRI_C		193
-#define BCM281XX_PIN_SRI_D		194
-#define BCM281XX_PIN_SRI_E		195
-#define BCM281XX_PIN_SSP_EXTCLK		196
-#define BCM281XX_PIN_SSP0_CLK		197
-#define BCM281XX_PIN_SSP0_FS		198
-#define BCM281XX_PIN_SSP0_RXD		199
-#define BCM281XX_PIN_SSP0_TXD		200
-#define BCM281XX_PIN_SSP2_CLK		201
-#define BCM281XX_PIN_SSP2_FS_0		202
-#define BCM281XX_PIN_SSP2_FS_1		203
-#define BCM281XX_PIN_SSP2_FS_2		204
-#define BCM281XX_PIN_SSP2_FS_3		205
-#define BCM281XX_PIN_SSP2_RXD_0		206
-#define BCM281XX_PIN_SSP2_RXD_1		207
-#define BCM281XX_PIN_SSP2_TXD_0		208
-#define BCM281XX_PIN_SSP2_TXD_1		209
-#define BCM281XX_PIN_SSP3_CLK		210
-#define BCM281XX_PIN_SSP3_FS		211
-#define BCM281XX_PIN_SSP3_RXD		212
-#define BCM281XX_PIN_SSP3_TXD		213
-#define BCM281XX_PIN_SSP4_CLK		214
-#define BCM281XX_PIN_SSP4_FS		215
-#define BCM281XX_PIN_SSP4_RXD		216
-#define BCM281XX_PIN_SSP4_TXD		217
-#define BCM281XX_PIN_SSP5_CLK		218
-#define BCM281XX_PIN_SSP5_FS		219
-#define BCM281XX_PIN_SSP5_RXD		220
-#define BCM281XX_PIN_SSP5_TXD		221
-#define BCM281XX_PIN_SSP6_CLK		222
-#define BCM281XX_PIN_SSP6_FS		223
-#define BCM281XX_PIN_SSP6_RXD		224
-#define BCM281XX_PIN_SSP6_TXD		225
-#define BCM281XX_PIN_STAT_1		226
-#define BCM281XX_PIN_STAT_2		227
-#define BCM281XX_PIN_SYSCLKEN		228
-#define BCM281XX_PIN_TRACECLK		229
-#define BCM281XX_PIN_TRACEDT00		230
-#define BCM281XX_PIN_TRACEDT01		231
-#define BCM281XX_PIN_TRACEDT02		232
-#define BCM281XX_PIN_TRACEDT03		233
-#define BCM281XX_PIN_TRACEDT04		234
-#define BCM281XX_PIN_TRACEDT05		235
-#define BCM281XX_PIN_TRACEDT06		236
-#define BCM281XX_PIN_TRACEDT07		237
-#define BCM281XX_PIN_TRACEDT08		238
-#define BCM281XX_PIN_TRACEDT09		239
-#define BCM281XX_PIN_TRACEDT10		240
-#define BCM281XX_PIN_TRACEDT11		241
-#define BCM281XX_PIN_TRACEDT12		242
-#define BCM281XX_PIN_TRACEDT13		243
-#define BCM281XX_PIN_TRACEDT14		244
-#define BCM281XX_PIN_TRACEDT15		245
-#define BCM281XX_PIN_TXDATA3G0		246
-#define BCM281XX_PIN_TXPWRIND		247
-#define BCM281XX_PIN_UARTB1_UCTS	248
-#define BCM281XX_PIN_UARTB1_URTS	249
-#define BCM281XX_PIN_UARTB1_URXD	250
-#define BCM281XX_PIN_UARTB1_UTXD	251
-#define BCM281XX_PIN_UARTB2_URXD	252
-#define BCM281XX_PIN_UARTB2_UTXD	253
-#define BCM281XX_PIN_UARTB3_UCTS	254
-#define BCM281XX_PIN_UARTB3_URTS	255
-#define BCM281XX_PIN_UARTB3_URXD	256
-#define BCM281XX_PIN_UARTB3_UTXD	257
-#define BCM281XX_PIN_UARTB4_UCTS	258
-#define BCM281XX_PIN_UARTB4_URTS	259
-#define BCM281XX_PIN_UARTB4_URXD	260
-#define BCM281XX_PIN_UARTB4_UTXD	261
-#define BCM281XX_PIN_VC_CAM1_SCL	262
-#define BCM281XX_PIN_VC_CAM1_SDA	263
-#define BCM281XX_PIN_VC_CAM2_SCL	264
-#define BCM281XX_PIN_VC_CAM2_SDA	265
-#define BCM281XX_PIN_VC_CAM3_SCL	266
-#define BCM281XX_PIN_VC_CAM3_SDA	267
-
-#define BCM281XX_PIN_DESC(a, b, c) \
-	{ .number = a, .name = b, .drv_data = &c##_pin }
-
-/*
- * Pin description definition.  The order here must be the same as defined in
- * the PADCTRLREG block in the RDB, since the pin number is used as an index
- * into this array.
- */
-static const struct pinctrl_pin_desc bcm281xx_pinctrl_pins[] = {
-	BCM281XX_PIN_DESC(BCM281XX_PIN_ADCSYNC, "adcsync", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_BAT_RM, "bat_rm", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_BSC1_SCL, "bsc1_scl", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_BSC1_SDA, "bsc1_sda", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_BSC2_SCL, "bsc2_scl", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_BSC2_SDA, "bsc2_sda", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CLASSGPWR, "classgpwr", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CLK_CX8, "clk_cx8", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKOUT_0, "clkout_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKOUT_1, "clkout_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKOUT_2, "clkout_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKOUT_3, "clkout_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKREQ_IN_0, "clkreq_in_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKREQ_IN_1, "clkreq_in_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CWS_SYS_REQ1, "cws_sys_req1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CWS_SYS_REQ2, "cws_sys_req2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CWS_SYS_REQ3, "cws_sys_req3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_DIGMIC1_CLK, "digmic1_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_DIGMIC1_DQ, "digmic1_dq", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_DIGMIC2_CLK, "digmic2_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_DIGMIC2_DQ, "digmic2_dq", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPEN13, "gpen13", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPEN14, "gpen14", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPEN15, "gpen15", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO00, "gpio00", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO01, "gpio01", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO02, "gpio02", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO03, "gpio03", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO04, "gpio04", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO05, "gpio05", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO06, "gpio06", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO07, "gpio07", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO08, "gpio08", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO09, "gpio09", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO10, "gpio10", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO11, "gpio11", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO12, "gpio12", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO13, "gpio13", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO14, "gpio14", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPS_PABLANK, "gps_pablank", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPS_TMARK, "gps_tmark", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_HDMI_SCL, "hdmi_scl", hdmi),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_HDMI_SDA, "hdmi_sda", hdmi),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_IC_DM, "ic_dm", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_IC_DP, "ic_dp", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_COL_IP_0, "kp_col_ip_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_COL_IP_1, "kp_col_ip_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_COL_IP_2, "kp_col_ip_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_COL_IP_3, "kp_col_ip_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_ROW_OP_0, "kp_row_op_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_ROW_OP_1, "kp_row_op_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_ROW_OP_2, "kp_row_op_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_ROW_OP_3, "kp_row_op_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_0, "lcd_b_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_1, "lcd_b_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_2, "lcd_b_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_3, "lcd_b_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_4, "lcd_b_4", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_5, "lcd_b_5", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_6, "lcd_b_6", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_7, "lcd_b_7", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_0, "lcd_g_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_1, "lcd_g_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_2, "lcd_g_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_3, "lcd_g_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_4, "lcd_g_4", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_5, "lcd_g_5", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_6, "lcd_g_6", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_7, "lcd_g_7", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_HSYNC, "lcd_hsync", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_OE, "lcd_oe", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_PCLK, "lcd_pclk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_0, "lcd_r_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_1, "lcd_r_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_2, "lcd_r_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_3, "lcd_r_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_4, "lcd_r_4", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_5, "lcd_r_5", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_6, "lcd_r_6", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_7, "lcd_r_7", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_VSYNC, "lcd_vsync", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO0, "mdmgpio0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO1, "mdmgpio1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO2, "mdmgpio2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO3, "mdmgpio3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO4, "mdmgpio4", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO5, "mdmgpio5", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO6, "mdmgpio6", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO7, "mdmgpio7", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO8, "mdmgpio8", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_0, "mphi_data_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_1, "mphi_data_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_2, "mphi_data_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_3, "mphi_data_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_4, "mphi_data_4", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_5, "mphi_data_5", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_6, "mphi_data_6", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_7, "mphi_data_7", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_8, "mphi_data_8", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_9, "mphi_data_9", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_10, "mphi_data_10", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_11, "mphi_data_11", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_12, "mphi_data_12", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_13, "mphi_data_13", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_14, "mphi_data_14", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_15, "mphi_data_15", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HA0, "mphi_ha0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HAT0, "mphi_hat0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HAT1, "mphi_hat1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HCE0_N, "mphi_hce0_n", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HCE1_N, "mphi_hce1_n", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HRD_N, "mphi_hrd_n", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HWR_N, "mphi_hwr_n", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_RUN0, "mphi_run0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_RUN1, "mphi_run1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MTX_SCAN_CLK, "mtx_scan_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MTX_SCAN_DATA, "mtx_scan_data", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_0, "nand_ad_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_1, "nand_ad_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_2, "nand_ad_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_3, "nand_ad_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_4, "nand_ad_4", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_5, "nand_ad_5", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_6, "nand_ad_6", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_7, "nand_ad_7", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_ALE, "nand_ale", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_CEN_0, "nand_cen_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_CEN_1, "nand_cen_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_CLE, "nand_cle", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_OEN, "nand_oen", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_RDY_0, "nand_rdy_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_RDY_1, "nand_rdy_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_WEN, "nand_wen", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_WP, "nand_wp", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_PC1, "pc1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_PC2, "pc2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_PMU_INT, "pmu_int", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_PMU_SCL, "pmu_scl", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_PMU_SDA, "pmu_sda", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RFST2G_MTSLOTEN3G, "rfst2g_mtsloten3g",
-		std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RX_CTL, "rgmii_0_rx_ctl", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXC, "rgmii_0_rxc", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXD_0, "rgmii_0_rxd_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXD_1, "rgmii_0_rxd_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXD_2, "rgmii_0_rxd_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXD_3, "rgmii_0_rxd_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TX_CTL, "rgmii_0_tx_ctl", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXC, "rgmii_0_txc", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXD_0, "rgmii_0_txd_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXD_1, "rgmii_0_txd_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXD_2, "rgmii_0_txd_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXD_3, "rgmii_0_txd_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RX_CTL, "rgmii_1_rx_ctl", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXC, "rgmii_1_rxc", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXD_0, "rgmii_1_rxd_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXD_1, "rgmii_1_rxd_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXD_2, "rgmii_1_rxd_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXD_3, "rgmii_1_rxd_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TX_CTL, "rgmii_1_tx_ctl", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXC, "rgmii_1_txc", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXD_0, "rgmii_1_txd_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXD_1, "rgmii_1_txd_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXD_2, "rgmii_1_txd_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXD_3, "rgmii_1_txd_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_GPIO_0, "rgmii_gpio_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_GPIO_1, "rgmii_gpio_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_GPIO_2, "rgmii_gpio_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_GPIO_3, "rgmii_gpio_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RTXDATA2G_TXDATA3G1,
-		"rtxdata2g_txdata3g1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RTXEN2G_TXDATA3G2, "rtxen2g_txdata3g2",
-		std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RXDATA3G0, "rxdata3g0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RXDATA3G1, "rxdata3g1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RXDATA3G2, "rxdata3g2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_CLK, "sdio1_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_CMD, "sdio1_cmd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_DATA_0, "sdio1_data_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_DATA_1, "sdio1_data_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_DATA_2, "sdio1_data_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_DATA_3, "sdio1_data_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_CLK, "sdio4_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_CMD, "sdio4_cmd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_DATA_0, "sdio4_data_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_DATA_1, "sdio4_data_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_DATA_2, "sdio4_data_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_DATA_3, "sdio4_data_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM_CLK, "sim_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM_DATA, "sim_data", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM_DET, "sim_det", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM_RESETN, "sim_resetn", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM2_CLK, "sim2_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM2_DATA, "sim2_data", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM2_DET, "sim2_det", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM2_RESETN, "sim2_resetn", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SRI_C, "sri_c", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SRI_D, "sri_d", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SRI_E, "sri_e", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP_EXTCLK, "ssp_extclk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP0_CLK, "ssp0_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP0_FS, "ssp0_fs", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP0_RXD, "ssp0_rxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP0_TXD, "ssp0_txd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_CLK, "ssp2_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_FS_0, "ssp2_fs_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_FS_1, "ssp2_fs_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_FS_2, "ssp2_fs_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_FS_3, "ssp2_fs_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_RXD_0, "ssp2_rxd_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_RXD_1, "ssp2_rxd_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_TXD_0, "ssp2_txd_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_TXD_1, "ssp2_txd_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP3_CLK, "ssp3_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP3_FS, "ssp3_fs", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP3_RXD, "ssp3_rxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP3_TXD, "ssp3_txd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP4_CLK, "ssp4_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP4_FS, "ssp4_fs", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP4_RXD, "ssp4_rxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP4_TXD, "ssp4_txd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP5_CLK, "ssp5_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP5_FS, "ssp5_fs", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP5_RXD, "ssp5_rxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP5_TXD, "ssp5_txd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP6_CLK, "ssp6_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP6_FS, "ssp6_fs", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP6_RXD, "ssp6_rxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP6_TXD, "ssp6_txd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_STAT_1, "stat_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_STAT_2, "stat_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SYSCLKEN, "sysclken", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACECLK, "traceclk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT00, "tracedt00", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT01, "tracedt01", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT02, "tracedt02", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT03, "tracedt03", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT04, "tracedt04", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT05, "tracedt05", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT06, "tracedt06", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT07, "tracedt07", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT08, "tracedt08", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT09, "tracedt09", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT10, "tracedt10", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT11, "tracedt11", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT12, "tracedt12", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT13, "tracedt13", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT14, "tracedt14", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT15, "tracedt15", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TXDATA3G0, "txdata3g0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TXPWRIND, "txpwrind", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB1_UCTS, "uartb1_ucts", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB1_URTS, "uartb1_urts", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB1_URXD, "uartb1_urxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB1_UTXD, "uartb1_utxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB2_URXD, "uartb2_urxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB2_UTXD, "uartb2_utxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB3_UCTS, "uartb3_ucts", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB3_URTS, "uartb3_urts", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB3_URXD, "uartb3_urxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB3_UTXD, "uartb3_utxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB4_UCTS, "uartb4_ucts", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB4_URTS, "uartb4_urts", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB4_URXD, "uartb4_urxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB4_UTXD, "uartb4_utxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM1_SCL, "vc_cam1_scl", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM1_SDA, "vc_cam1_sda", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM2_SCL, "vc_cam2_scl", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM2_SDA, "vc_cam2_sda", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM3_SCL, "vc_cam3_scl", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM3_SDA, "vc_cam3_sda", i2c),
-};
-
-static const char * const bcm281xx_alt_groups[] = {
-	"adcsync",
-	"bat_rm",
-	"bsc1_scl",
-	"bsc1_sda",
-	"bsc2_scl",
-	"bsc2_sda",
-	"classgpwr",
-	"clk_cx8",
-	"clkout_0",
-	"clkout_1",
-	"clkout_2",
-	"clkout_3",
-	"clkreq_in_0",
-	"clkreq_in_1",
-	"cws_sys_req1",
-	"cws_sys_req2",
-	"cws_sys_req3",
-	"digmic1_clk",
-	"digmic1_dq",
-	"digmic2_clk",
-	"digmic2_dq",
-	"gpen13",
-	"gpen14",
-	"gpen15",
-	"gpio00",
-	"gpio01",
-	"gpio02",
-	"gpio03",
-	"gpio04",
-	"gpio05",
-	"gpio06",
-	"gpio07",
-	"gpio08",
-	"gpio09",
-	"gpio10",
-	"gpio11",
-	"gpio12",
-	"gpio13",
-	"gpio14",
-	"gps_pablank",
-	"gps_tmark",
-	"hdmi_scl",
-	"hdmi_sda",
-	"ic_dm",
-	"ic_dp",
-	"kp_col_ip_0",
-	"kp_col_ip_1",
-	"kp_col_ip_2",
-	"kp_col_ip_3",
-	"kp_row_op_0",
-	"kp_row_op_1",
-	"kp_row_op_2",
-	"kp_row_op_3",
-	"lcd_b_0",
-	"lcd_b_1",
-	"lcd_b_2",
-	"lcd_b_3",
-	"lcd_b_4",
-	"lcd_b_5",
-	"lcd_b_6",
-	"lcd_b_7",
-	"lcd_g_0",
-	"lcd_g_1",
-	"lcd_g_2",
-	"lcd_g_3",
-	"lcd_g_4",
-	"lcd_g_5",
-	"lcd_g_6",
-	"lcd_g_7",
-	"lcd_hsync",
-	"lcd_oe",
-	"lcd_pclk",
-	"lcd_r_0",
-	"lcd_r_1",
-	"lcd_r_2",
-	"lcd_r_3",
-	"lcd_r_4",
-	"lcd_r_5",
-	"lcd_r_6",
-	"lcd_r_7",
-	"lcd_vsync",
-	"mdmgpio0",
-	"mdmgpio1",
-	"mdmgpio2",
-	"mdmgpio3",
-	"mdmgpio4",
-	"mdmgpio5",
-	"mdmgpio6",
-	"mdmgpio7",
-	"mdmgpio8",
-	"mphi_data_0",
-	"mphi_data_1",
-	"mphi_data_2",
-	"mphi_data_3",
-	"mphi_data_4",
-	"mphi_data_5",
-	"mphi_data_6",
-	"mphi_data_7",
-	"mphi_data_8",
-	"mphi_data_9",
-	"mphi_data_10",
-	"mphi_data_11",
-	"mphi_data_12",
-	"mphi_data_13",
-	"mphi_data_14",
-	"mphi_data_15",
-	"mphi_ha0",
-	"mphi_hat0",
-	"mphi_hat1",
-	"mphi_hce0_n",
-	"mphi_hce1_n",
-	"mphi_hrd_n",
-	"mphi_hwr_n",
-	"mphi_run0",
-	"mphi_run1",
-	"mtx_scan_clk",
-	"mtx_scan_data",
-	"nand_ad_0",
-	"nand_ad_1",
-	"nand_ad_2",
-	"nand_ad_3",
-	"nand_ad_4",
-	"nand_ad_5",
-	"nand_ad_6",
-	"nand_ad_7",
-	"nand_ale",
-	"nand_cen_0",
-	"nand_cen_1",
-	"nand_cle",
-	"nand_oen",
-	"nand_rdy_0",
-	"nand_rdy_1",
-	"nand_wen",
-	"nand_wp",
-	"pc1",
-	"pc2",
-	"pmu_int",
-	"pmu_scl",
-	"pmu_sda",
-	"rfst2g_mtsloten3g",
-	"rgmii_0_rx_ctl",
-	"rgmii_0_rxc",
-	"rgmii_0_rxd_0",
-	"rgmii_0_rxd_1",
-	"rgmii_0_rxd_2",
-	"rgmii_0_rxd_3",
-	"rgmii_0_tx_ctl",
-	"rgmii_0_txc",
-	"rgmii_0_txd_0",
-	"rgmii_0_txd_1",
-	"rgmii_0_txd_2",
-	"rgmii_0_txd_3",
-	"rgmii_1_rx_ctl",
-	"rgmii_1_rxc",
-	"rgmii_1_rxd_0",
-	"rgmii_1_rxd_1",
-	"rgmii_1_rxd_2",
-	"rgmii_1_rxd_3",
-	"rgmii_1_tx_ctl",
-	"rgmii_1_txc",
-	"rgmii_1_txd_0",
-	"rgmii_1_txd_1",
-	"rgmii_1_txd_2",
-	"rgmii_1_txd_3",
-	"rgmii_gpio_0",
-	"rgmii_gpio_1",
-	"rgmii_gpio_2",
-	"rgmii_gpio_3",
-	"rtxdata2g_txdata3g1",
-	"rtxen2g_txdata3g2",
-	"rxdata3g0",
-	"rxdata3g1",
-	"rxdata3g2",
-	"sdio1_clk",
-	"sdio1_cmd",
-	"sdio1_data_0",
-	"sdio1_data_1",
-	"sdio1_data_2",
-	"sdio1_data_3",
-	"sdio4_clk",
-	"sdio4_cmd",
-	"sdio4_data_0",
-	"sdio4_data_1",
-	"sdio4_data_2",
-	"sdio4_data_3",
-	"sim_clk",
-	"sim_data",
-	"sim_det",
-	"sim_resetn",
-	"sim2_clk",
-	"sim2_data",
-	"sim2_det",
-	"sim2_resetn",
-	"sri_c",
-	"sri_d",
-	"sri_e",
-	"ssp_extclk",
-	"ssp0_clk",
-	"ssp0_fs",
-	"ssp0_rxd",
-	"ssp0_txd",
-	"ssp2_clk",
-	"ssp2_fs_0",
-	"ssp2_fs_1",
-	"ssp2_fs_2",
-	"ssp2_fs_3",
-	"ssp2_rxd_0",
-	"ssp2_rxd_1",
-	"ssp2_txd_0",
-	"ssp2_txd_1",
-	"ssp3_clk",
-	"ssp3_fs",
-	"ssp3_rxd",
-	"ssp3_txd",
-	"ssp4_clk",
-	"ssp4_fs",
-	"ssp4_rxd",
-	"ssp4_txd",
-	"ssp5_clk",
-	"ssp5_fs",
-	"ssp5_rxd",
-	"ssp5_txd",
-	"ssp6_clk",
-	"ssp6_fs",
-	"ssp6_rxd",
-	"ssp6_txd",
-	"stat_1",
-	"stat_2",
-	"sysclken",
-	"traceclk",
-	"tracedt00",
-	"tracedt01",
-	"tracedt02",
-	"tracedt03",
-	"tracedt04",
-	"tracedt05",
-	"tracedt06",
-	"tracedt07",
-	"tracedt08",
-	"tracedt09",
-	"tracedt10",
-	"tracedt11",
-	"tracedt12",
-	"tracedt13",
-	"tracedt14",
-	"tracedt15",
-	"txdata3g0",
-	"txpwrind",
-	"uartb1_ucts",
-	"uartb1_urts",
-	"uartb1_urxd",
-	"uartb1_utxd",
-	"uartb2_urxd",
-	"uartb2_utxd",
-	"uartb3_ucts",
-	"uartb3_urts",
-	"uartb3_urxd",
-	"uartb3_utxd",
-	"uartb4_ucts",
-	"uartb4_urts",
-	"uartb4_urxd",
-	"uartb4_utxd",
-	"vc_cam1_scl",
-	"vc_cam1_sda",
-	"vc_cam2_scl",
-	"vc_cam2_sda",
-	"vc_cam3_scl",
-	"vc_cam3_sda",
-};
-
-/* Every pin can implement all ALT1-ALT4 functions */
-#define BCM281XX_PIN_FUNCTION(fcn_name)			\
-{							\
-	.name = #fcn_name,				\
-	.groups = bcm281xx_alt_groups,			\
-	.ngroups = ARRAY_SIZE(bcm281xx_alt_groups),	\
-}
-
-static const struct bcm281xx_pin_function bcm281xx_functions[] = {
-	BCM281XX_PIN_FUNCTION(alt1),
-	BCM281XX_PIN_FUNCTION(alt2),
-	BCM281XX_PIN_FUNCTION(alt3),
-	BCM281XX_PIN_FUNCTION(alt4),
-};
-
-static struct bcm281xx_pinctrl_data bcm281xx_pinctrl = {
-	.pins = bcm281xx_pinctrl_pins,
-	.npins = ARRAY_SIZE(bcm281xx_pinctrl_pins),
-	.functions = bcm281xx_functions,
-	.nfunctions = ARRAY_SIZE(bcm281xx_functions),
-};
-
-static inline enum bcm281xx_pin_type pin_type_get(struct pinctrl_dev *pctldev,
-						  unsigned pin)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-
-	if (pin >= pdata->npins)
-		return BCM281XX_PIN_TYPE_UNKNOWN;
-
-	return *(enum bcm281xx_pin_type *)(pdata->pins[pin].drv_data);
-}
-
-#define BCM281XX_PIN_SHIFT(type, param) \
-	(BCM281XX_ ## type ## _PIN_REG_ ## param ## _SHIFT)
-
-#define BCM281XX_PIN_MASK(type, param) \
-	(BCM281XX_ ## type ## _PIN_REG_ ## param ## _MASK)
-
-/*
- * This helper function is used to build up the value and mask used to write to
- * a pin register, but does not actually write to the register.
- */
-static inline void bcm281xx_pin_update(u32 *reg_val, u32 *reg_mask,
-				       u32 param_val, u32 param_shift,
-				       u32 param_mask)
-{
-	*reg_val &= ~param_mask;
-	*reg_val |= (param_val << param_shift) & param_mask;
-	*reg_mask |= param_mask;
-}
-
-static struct regmap_config bcm281xx_pinctrl_regmap_config = {
-	.reg_bits = 32,
-	.reg_stride = 4,
-	.val_bits = 32,
-	.max_register = BCM281XX_PIN_VC_CAM3_SDA,
-};
-
-static int bcm281xx_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-
-	return pdata->npins;
-}
-
-static const char *bcm281xx_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
-						   unsigned group)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-
-	return pdata->pins[group].name;
-}
-
-static int bcm281xx_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
-					   unsigned group,
-					   const unsigned **pins,
-					   unsigned *num_pins)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-
-	*pins = &pdata->pins[group].number;
-	*num_pins = 1;
-
-	return 0;
-}
-
-static void bcm281xx_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
-					  struct seq_file *s,
-					  unsigned offset)
-{
-	seq_printf(s, " %s", dev_name(pctldev->dev));
-}
-
-static struct pinctrl_ops bcm281xx_pinctrl_ops = {
-	.get_groups_count = bcm281xx_pinctrl_get_groups_count,
-	.get_group_name = bcm281xx_pinctrl_get_group_name,
-	.get_group_pins = bcm281xx_pinctrl_get_group_pins,
-	.pin_dbg_show = bcm281xx_pinctrl_pin_dbg_show,
-	.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
-	.dt_free_map = pinctrl_utils_dt_free_map,
-};
-
-static int bcm281xx_pinctrl_get_fcns_count(struct pinctrl_dev *pctldev)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-
-	return pdata->nfunctions;
-}
-
-static const char *bcm281xx_pinctrl_get_fcn_name(struct pinctrl_dev *pctldev,
-						 unsigned function)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-
-	return pdata->functions[function].name;
-}
-
-static int bcm281xx_pinctrl_get_fcn_groups(struct pinctrl_dev *pctldev,
-					   unsigned function,
-					   const char * const **groups,
-					   unsigned * const num_groups)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-
-	*groups = pdata->functions[function].groups;
-	*num_groups = pdata->functions[function].ngroups;
-
-	return 0;
-}
-
-static int bcm281xx_pinmux_set(struct pinctrl_dev *pctldev,
-			       unsigned function,
-			       unsigned group)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-	const struct bcm281xx_pin_function *f = &pdata->functions[function];
-	u32 offset = 4 * pdata->pins[group].number;
-	int rc = 0;
-
-	dev_dbg(pctldev->dev,
-		"%s(): Enable function %s (%d) of pin %s (%d) @offset 0x%x.\n",
-		__func__, f->name, function, pdata->pins[group].name,
-		pdata->pins[group].number, offset);
-
-	rc = regmap_update_bits(pdata->regmap, offset,
-		BCM281XX_PIN_REG_F_SEL_MASK,
-		function << BCM281XX_PIN_REG_F_SEL_SHIFT);
-	if (rc)
-		dev_err(pctldev->dev,
-			"Error updating register for pin %s (%d).\n",
-			pdata->pins[group].name, pdata->pins[group].number);
-
-	return rc;
-}
-
-static struct pinmux_ops bcm281xx_pinctrl_pinmux_ops = {
-	.get_functions_count = bcm281xx_pinctrl_get_fcns_count,
-	.get_function_name = bcm281xx_pinctrl_get_fcn_name,
-	.get_function_groups = bcm281xx_pinctrl_get_fcn_groups,
-	.set_mux = bcm281xx_pinmux_set,
-};
-
-static int bcm281xx_pinctrl_pin_config_get(struct pinctrl_dev *pctldev,
-					   unsigned pin,
-					   unsigned long *config)
-{
-	return -ENOTSUPP;
-}
-
-
-/* Goes through the configs and update register val/mask */
-static int bcm281xx_std_pin_update(struct pinctrl_dev *pctldev,
-				   unsigned pin,
-				   unsigned long *configs,
-				   unsigned num_configs,
-				   u32 *val,
-				   u32 *mask)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-	int i;
-	enum pin_config_param param;
-	u16 arg;
-
-	for (i = 0; i < num_configs; i++) {
-		param = pinconf_to_config_param(configs[i]);
-		arg = pinconf_to_config_argument(configs[i]);
-
-		switch (param) {
-		case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
-			arg = (arg >= 1 ? 1 : 0);
-			bcm281xx_pin_update(val, mask, arg,
-				BCM281XX_PIN_SHIFT(STD, HYST),
-				BCM281XX_PIN_MASK(STD, HYST));
-			break;
-		/*
-		 * The pin bias can only be one of pull-up, pull-down, or
-		 * disable.  The user does not need to specify a value for the
-		 * property, and the default value from pinconf-generic is
-		 * ignored.
-		 */
-		case PIN_CONFIG_BIAS_DISABLE:
-			bcm281xx_pin_update(val, mask, 0,
-				BCM281XX_PIN_SHIFT(STD, PULL_UP),
-				BCM281XX_PIN_MASK(STD, PULL_UP));
-			bcm281xx_pin_update(val, mask, 0,
-				BCM281XX_PIN_SHIFT(STD, PULL_DN),
-				BCM281XX_PIN_MASK(STD, PULL_DN));
-			break;
-
-		case PIN_CONFIG_BIAS_PULL_UP:
-			bcm281xx_pin_update(val, mask, 1,
-				BCM281XX_PIN_SHIFT(STD, PULL_UP),
-				BCM281XX_PIN_MASK(STD, PULL_UP));
-			bcm281xx_pin_update(val, mask, 0,
-				BCM281XX_PIN_SHIFT(STD, PULL_DN),
-				BCM281XX_PIN_MASK(STD, PULL_DN));
-			break;
-
-		case PIN_CONFIG_BIAS_PULL_DOWN:
-			bcm281xx_pin_update(val, mask, 0,
-				BCM281XX_PIN_SHIFT(STD, PULL_UP),
-				BCM281XX_PIN_MASK(STD, PULL_UP));
-			bcm281xx_pin_update(val, mask, 1,
-				BCM281XX_PIN_SHIFT(STD, PULL_DN),
-				BCM281XX_PIN_MASK(STD, PULL_DN));
-			break;
-
-		case PIN_CONFIG_SLEW_RATE:
-			arg = (arg >= 1 ? 1 : 0);
-			bcm281xx_pin_update(val, mask, arg,
-				BCM281XX_PIN_SHIFT(STD, SLEW),
-				BCM281XX_PIN_MASK(STD, SLEW));
-			break;
-
-		case PIN_CONFIG_INPUT_ENABLE:
-			/* inversed since register is for input _disable_ */
-			arg = (arg >= 1 ? 0 : 1);
-			bcm281xx_pin_update(val, mask, arg,
-				BCM281XX_PIN_SHIFT(STD, INPUT_DIS),
-				BCM281XX_PIN_MASK(STD, INPUT_DIS));
-			break;
-
-		case PIN_CONFIG_DRIVE_STRENGTH:
-			/* Valid range is 2-16 mA, even numbers only */
-			if ((arg < 2) || (arg > 16) || (arg % 2)) {
-				dev_err(pctldev->dev,
-					"Invalid Drive Strength value (%d) for "
-					"pin %s (%d). Valid values are "
-					"(2..16) mA, even numbers only.\n",
-					arg, pdata->pins[pin].name, pin);
-				return -EINVAL;
-			}
-			bcm281xx_pin_update(val, mask, (arg/2)-1,
-				BCM281XX_PIN_SHIFT(STD, DRV_STR),
-				BCM281XX_PIN_MASK(STD, DRV_STR));
-			break;
-
-		default:
-			dev_err(pctldev->dev,
-				"Unrecognized pin config %d for pin %s (%d).\n",
-				param, pdata->pins[pin].name, pin);
-			return -EINVAL;
-
-		} /* switch config */
-	} /* for each config */
-
-	return 0;
-}
-
-/*
- * The pull-up strength for an I2C pin is represented by bits 4-6 in the
- * register with the following mapping:
- *   0b000: No pull-up
- *   0b001: 1200 Ohm
- *   0b010: 1800 Ohm
- *   0b011: 720 Ohm
- *   0b100: 2700 Ohm
- *   0b101: 831 Ohm
- *   0b110: 1080 Ohm
- *   0b111: 568 Ohm
- * This array maps pull-up strength in Ohms to register values (1+index).
- */
-static const u16 bcm281xx_pullup_map[] = {
-	1200, 1800, 720, 2700, 831, 1080, 568
-};
-
-/* Goes through the configs and update register val/mask */
-static int bcm281xx_i2c_pin_update(struct pinctrl_dev *pctldev,
-				   unsigned pin,
-				   unsigned long *configs,
-				   unsigned num_configs,
-				   u32 *val,
-				   u32 *mask)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-	int i, j;
-	enum pin_config_param param;
-	u16 arg;
-
-	for (i = 0; i < num_configs; i++) {
-		param = pinconf_to_config_param(configs[i]);
-		arg = pinconf_to_config_argument(configs[i]);
-
-		switch (param) {
-		case PIN_CONFIG_BIAS_PULL_UP:
-			for (j = 0; j < ARRAY_SIZE(bcm281xx_pullup_map); j++)
-				if (bcm281xx_pullup_map[j] == arg)
-					break;
-
-			if (j == ARRAY_SIZE(bcm281xx_pullup_map)) {
-				dev_err(pctldev->dev,
-					"Invalid pull-up value (%d) for pin %s "
-					"(%d). Valid values are 568, 720, 831, "
-					"1080, 1200, 1800, 2700 Ohms.\n",
-					arg, pdata->pins[pin].name, pin);
-				return -EINVAL;
-			}
-
-			bcm281xx_pin_update(val, mask, j+1,
-				BCM281XX_PIN_SHIFT(I2C, PULL_UP_STR),
-				BCM281XX_PIN_MASK(I2C, PULL_UP_STR));
-			break;
-
-		case PIN_CONFIG_BIAS_DISABLE:
-			bcm281xx_pin_update(val, mask, 0,
-				BCM281XX_PIN_SHIFT(I2C, PULL_UP_STR),
-				BCM281XX_PIN_MASK(I2C, PULL_UP_STR));
-			break;
-
-		case PIN_CONFIG_SLEW_RATE:
-			arg = (arg >= 1 ? 1 : 0);
-			bcm281xx_pin_update(val, mask, arg,
-				BCM281XX_PIN_SHIFT(I2C, SLEW),
-				BCM281XX_PIN_MASK(I2C, SLEW));
-			break;
-
-		case PIN_CONFIG_INPUT_ENABLE:
-			/* inversed since register is for input _disable_ */
-			arg = (arg >= 1 ? 0 : 1);
-			bcm281xx_pin_update(val, mask, arg,
-				BCM281XX_PIN_SHIFT(I2C, INPUT_DIS),
-				BCM281XX_PIN_MASK(I2C, INPUT_DIS));
-			break;
-
-		default:
-			dev_err(pctldev->dev,
-				"Unrecognized pin config %d for pin %s (%d).\n",
-				param, pdata->pins[pin].name, pin);
-			return -EINVAL;
-
-		} /* switch config */
-	} /* for each config */
-
-	return 0;
-}
-
-/* Goes through the configs and update register val/mask */
-static int bcm281xx_hdmi_pin_update(struct pinctrl_dev *pctldev,
-				    unsigned pin,
-				    unsigned long *configs,
-				    unsigned num_configs,
-				    u32 *val,
-				    u32 *mask)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-	int i;
-	enum pin_config_param param;
-	u16 arg;
-
-	for (i = 0; i < num_configs; i++) {
-		param = pinconf_to_config_param(configs[i]);
-		arg = pinconf_to_config_argument(configs[i]);
-
-		switch (param) {
-		case PIN_CONFIG_SLEW_RATE:
-			arg = (arg >= 1 ? 1 : 0);
-			bcm281xx_pin_update(val, mask, arg,
-				BCM281XX_PIN_SHIFT(HDMI, MODE),
-				BCM281XX_PIN_MASK(HDMI, MODE));
-			break;
-
-		case PIN_CONFIG_INPUT_ENABLE:
-			/* inversed since register is for input _disable_ */
-			arg = (arg >= 1 ? 0 : 1);
-			bcm281xx_pin_update(val, mask, arg,
-				BCM281XX_PIN_SHIFT(HDMI, INPUT_DIS),
-				BCM281XX_PIN_MASK(HDMI, INPUT_DIS));
-			break;
-
-		default:
-			dev_err(pctldev->dev,
-				"Unrecognized pin config %d for pin %s (%d).\n",
-				param, pdata->pins[pin].name, pin);
-			return -EINVAL;
-
-		} /* switch config */
-	} /* for each config */
-
-	return 0;
-}
-
-static int bcm281xx_pinctrl_pin_config_set(struct pinctrl_dev *pctldev,
-					   unsigned pin,
-					   unsigned long *configs,
-					   unsigned num_configs)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-	enum bcm281xx_pin_type pin_type;
-	u32 offset = 4 * pin;
-	u32 cfg_val, cfg_mask;
-	int rc;
-
-	cfg_val = 0;
-	cfg_mask = 0;
-	pin_type = pin_type_get(pctldev, pin);
-
-	/* Different pins have different configuration options */
-	switch (pin_type) {
-	case BCM281XX_PIN_TYPE_STD:
-		rc = bcm281xx_std_pin_update(pctldev, pin, configs,
-			num_configs, &cfg_val, &cfg_mask);
-		break;
-
-	case BCM281XX_PIN_TYPE_I2C:
-		rc = bcm281xx_i2c_pin_update(pctldev, pin, configs,
-			num_configs, &cfg_val, &cfg_mask);
-		break;
-
-	case BCM281XX_PIN_TYPE_HDMI:
-		rc = bcm281xx_hdmi_pin_update(pctldev, pin, configs,
-			num_configs, &cfg_val, &cfg_mask);
-		break;
-
-	default:
-		dev_err(pctldev->dev, "Unknown pin type for pin %s (%d).\n",
-			pdata->pins[pin].name, pin);
-		return -EINVAL;
-
-	} /* switch pin type */
-
-	if (rc)
-		return rc;
-
-	dev_dbg(pctldev->dev,
-		"%s(): Set pin %s (%d) with config 0x%x, mask 0x%x\n",
-		__func__, pdata->pins[pin].name, pin, cfg_val, cfg_mask);
-
-	rc = regmap_update_bits(pdata->regmap, offset, cfg_mask, cfg_val);
-	if (rc) {
-		dev_err(pctldev->dev,
-			"Error updating register for pin %s (%d).\n",
-			pdata->pins[pin].name, pin);
-		return rc;
-	}
-
-	return 0;
-}
-
-static struct pinconf_ops bcm281xx_pinctrl_pinconf_ops = {
-	.pin_config_get = bcm281xx_pinctrl_pin_config_get,
-	.pin_config_set = bcm281xx_pinctrl_pin_config_set,
-};
-
-static struct pinctrl_desc bcm281xx_pinctrl_desc = {
-	/* name, pins, npins members initialized in probe function */
-	.pctlops = &bcm281xx_pinctrl_ops,
-	.pmxops = &bcm281xx_pinctrl_pinmux_ops,
-	.confops = &bcm281xx_pinctrl_pinconf_ops,
-	.owner = THIS_MODULE,
-};
-
-static int __init bcm281xx_pinctrl_probe(struct platform_device *pdev)
-{
-	struct bcm281xx_pinctrl_data *pdata = &bcm281xx_pinctrl;
-	struct resource *res;
-	struct pinctrl_dev *pctl;
-
-	/* So far We can assume there is only 1 bank of registers */
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	pdata->reg_base = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(pdata->reg_base)) {
-		dev_err(&pdev->dev, "Failed to ioremap MEM resource\n");
-		return -ENODEV;
-	}
-
-	/* Initialize the dynamic part of pinctrl_desc */
-	pdata->regmap = devm_regmap_init_mmio(&pdev->dev, pdata->reg_base,
-		&bcm281xx_pinctrl_regmap_config);
-	if (IS_ERR(pdata->regmap)) {
-		dev_err(&pdev->dev, "Regmap MMIO init failed.\n");
-		return -ENODEV;
-	}
-
-	bcm281xx_pinctrl_desc.name = dev_name(&pdev->dev);
-	bcm281xx_pinctrl_desc.pins = bcm281xx_pinctrl.pins;
-	bcm281xx_pinctrl_desc.npins = bcm281xx_pinctrl.npins;
-
-	pctl = pinctrl_register(&bcm281xx_pinctrl_desc,
-				&pdev->dev,
-				pdata);
-	if (!pctl) {
-		dev_err(&pdev->dev, "Failed to register pinctrl\n");
-		return -ENODEV;
-	}
-
-	platform_set_drvdata(pdev, pdata);
-
-	return 0;
-}
-
-static struct of_device_id bcm281xx_pinctrl_of_match[] = {
-	{ .compatible = "brcm,bcm11351-pinctrl", },
-	{ },
-};
-
-static struct platform_driver bcm281xx_pinctrl_driver = {
-	.driver = {
-		.name = "bcm281xx-pinctrl",
-		.of_match_table = bcm281xx_pinctrl_of_match,
-	},
-};
-
-module_platform_driver_probe(bcm281xx_pinctrl_driver, bcm281xx_pinctrl_probe);
-
-MODULE_AUTHOR("Broadcom Corporation <bcm-kernel-feedback-list@broadcom.com>");
-MODULE_AUTHOR("Sherman Yin <syin@broadcom.com>");
-MODULE_DESCRIPTION("Broadcom BCM281xx pinctrl driver");
-MODULE_LICENSE("GPL v2");
diff --git a/drivers/pinctrl/pinctrl-bcm2835.c b/drivers/pinctrl/pinctrl-bcm2835.c
deleted file mode 100644
index 9aa8a3f..0000000
--- a/drivers/pinctrl/pinctrl-bcm2835.c
+++ /dev/null
@@ -1,1072 +0,0 @@
-/*
- * Driver for Broadcom BCM2835 GPIO unit (pinctrl + GPIO)
- *
- * Copyright (C) 2012 Chris Boot, Simon Arlott, Stephen Warren
- *
- * This driver is inspired by:
- * pinctrl-nomadik.c, please see original file for copyright information
- * pinctrl-tegra.c, please see original file for copyright information
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
-
-#include <linux/bitmap.h>
-#include <linux/bug.h>
-#include <linux/delay.h>
-#include <linux/device.h>
-#include <linux/err.h>
-#include <linux/gpio.h>
-#include <linux/interrupt.h>
-#include <linux/io.h>
-#include <linux/irq.h>
-#include <linux/irqdesc.h>
-#include <linux/irqdomain.h>
-#include <linux/module.h>
-#include <linux/of_address.h>
-#include <linux/of.h>
-#include <linux/of_irq.h>
-#include <linux/pinctrl/consumer.h>
-#include <linux/pinctrl/machine.h>
-#include <linux/pinctrl/pinconf.h>
-#include <linux/pinctrl/pinctrl.h>
-#include <linux/pinctrl/pinmux.h>
-#include <linux/platform_device.h>
-#include <linux/seq_file.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
-#include <linux/types.h>
-
-#define MODULE_NAME "pinctrl-bcm2835"
-#define BCM2835_NUM_GPIOS 54
-#define BCM2835_NUM_BANKS 2
-
-#define BCM2835_PIN_BITMAP_SZ \
-	DIV_ROUND_UP(BCM2835_NUM_GPIOS, sizeof(unsigned long) * 8)
-
-/* GPIO register offsets */
-#define GPFSEL0		0x0	/* Function Select */
-#define GPSET0		0x1c	/* Pin Output Set */
-#define GPCLR0		0x28	/* Pin Output Clear */
-#define GPLEV0		0x34	/* Pin Level */
-#define GPEDS0		0x40	/* Pin Event Detect Status */
-#define GPREN0		0x4c	/* Pin Rising Edge Detect Enable */
-#define GPFEN0		0x58	/* Pin Falling Edge Detect Enable */
-#define GPHEN0		0x64	/* Pin High Detect Enable */
-#define GPLEN0		0x70	/* Pin Low Detect Enable */
-#define GPAREN0		0x7c	/* Pin Async Rising Edge Detect */
-#define GPAFEN0		0x88	/* Pin Async Falling Edge Detect */
-#define GPPUD		0x94	/* Pin Pull-up/down Enable */
-#define GPPUDCLK0	0x98	/* Pin Pull-up/down Enable Clock */
-
-#define FSEL_REG(p)		(GPFSEL0 + (((p) / 10) * 4))
-#define FSEL_SHIFT(p)		(((p) % 10) * 3)
-#define GPIO_REG_OFFSET(p)	((p) / 32)
-#define GPIO_REG_SHIFT(p)	((p) % 32)
-
-enum bcm2835_pinconf_param {
-	/* argument: bcm2835_pinconf_pull */
-	BCM2835_PINCONF_PARAM_PULL,
-};
-
-enum bcm2835_pinconf_pull {
-	BCM2835_PINCONFIG_PULL_NONE,
-	BCM2835_PINCONFIG_PULL_DOWN,
-	BCM2835_PINCONFIG_PULL_UP,
-};
-
-#define BCM2835_PINCONF_PACK(_param_, _arg_) ((_param_) << 16 | (_arg_))
-#define BCM2835_PINCONF_UNPACK_PARAM(_conf_) ((_conf_) >> 16)
-#define BCM2835_PINCONF_UNPACK_ARG(_conf_) ((_conf_) & 0xffff)
-
-struct bcm2835_gpio_irqdata {
-	struct bcm2835_pinctrl *pc;
-	int bank;
-};
-
-struct bcm2835_pinctrl {
-	struct device *dev;
-	void __iomem *base;
-	int irq[BCM2835_NUM_BANKS];
-
-	/* note: locking assumes each bank will have its own unsigned long */
-	unsigned long enabled_irq_map[BCM2835_NUM_BANKS];
-	unsigned int irq_type[BCM2835_NUM_GPIOS];
-
-	struct pinctrl_dev *pctl_dev;
-	struct irq_domain *irq_domain;
-	struct gpio_chip gpio_chip;
-	struct pinctrl_gpio_range gpio_range;
-
-	struct bcm2835_gpio_irqdata irq_data[BCM2835_NUM_BANKS];
-	spinlock_t irq_lock[BCM2835_NUM_BANKS];
-};
-
-static struct lock_class_key gpio_lock_class;
-
-/* pins are just named GPIO0..GPIO53 */
-#define BCM2835_GPIO_PIN(a) PINCTRL_PIN(a, "gpio" #a)
-static struct pinctrl_pin_desc bcm2835_gpio_pins[] = {
-	BCM2835_GPIO_PIN(0),
-	BCM2835_GPIO_PIN(1),
-	BCM2835_GPIO_PIN(2),
-	BCM2835_GPIO_PIN(3),
-	BCM2835_GPIO_PIN(4),
-	BCM2835_GPIO_PIN(5),
-	BCM2835_GPIO_PIN(6),
-	BCM2835_GPIO_PIN(7),
-	BCM2835_GPIO_PIN(8),
-	BCM2835_GPIO_PIN(9),
-	BCM2835_GPIO_PIN(10),
-	BCM2835_GPIO_PIN(11),
-	BCM2835_GPIO_PIN(12),
-	BCM2835_GPIO_PIN(13),
-	BCM2835_GPIO_PIN(14),
-	BCM2835_GPIO_PIN(15),
-	BCM2835_GPIO_PIN(16),
-	BCM2835_GPIO_PIN(17),
-	BCM2835_GPIO_PIN(18),
-	BCM2835_GPIO_PIN(19),
-	BCM2835_GPIO_PIN(20),
-	BCM2835_GPIO_PIN(21),
-	BCM2835_GPIO_PIN(22),
-	BCM2835_GPIO_PIN(23),
-	BCM2835_GPIO_PIN(24),
-	BCM2835_GPIO_PIN(25),
-	BCM2835_GPIO_PIN(26),
-	BCM2835_GPIO_PIN(27),
-	BCM2835_GPIO_PIN(28),
-	BCM2835_GPIO_PIN(29),
-	BCM2835_GPIO_PIN(30),
-	BCM2835_GPIO_PIN(31),
-	BCM2835_GPIO_PIN(32),
-	BCM2835_GPIO_PIN(33),
-	BCM2835_GPIO_PIN(34),
-	BCM2835_GPIO_PIN(35),
-	BCM2835_GPIO_PIN(36),
-	BCM2835_GPIO_PIN(37),
-	BCM2835_GPIO_PIN(38),
-	BCM2835_GPIO_PIN(39),
-	BCM2835_GPIO_PIN(40),
-	BCM2835_GPIO_PIN(41),
-	BCM2835_GPIO_PIN(42),
-	BCM2835_GPIO_PIN(43),
-	BCM2835_GPIO_PIN(44),
-	BCM2835_GPIO_PIN(45),
-	BCM2835_GPIO_PIN(46),
-	BCM2835_GPIO_PIN(47),
-	BCM2835_GPIO_PIN(48),
-	BCM2835_GPIO_PIN(49),
-	BCM2835_GPIO_PIN(50),
-	BCM2835_GPIO_PIN(51),
-	BCM2835_GPIO_PIN(52),
-	BCM2835_GPIO_PIN(53),
-};
-
-/* one pin per group */
-static const char * const bcm2835_gpio_groups[] = {
-	"gpio0",
-	"gpio1",
-	"gpio2",
-	"gpio3",
-	"gpio4",
-	"gpio5",
-	"gpio6",
-	"gpio7",
-	"gpio8",
-	"gpio9",
-	"gpio10",
-	"gpio11",
-	"gpio12",
-	"gpio13",
-	"gpio14",
-	"gpio15",
-	"gpio16",
-	"gpio17",
-	"gpio18",
-	"gpio19",
-	"gpio20",
-	"gpio21",
-	"gpio22",
-	"gpio23",
-	"gpio24",
-	"gpio25",
-	"gpio26",
-	"gpio27",
-	"gpio28",
-	"gpio29",
-	"gpio30",
-	"gpio31",
-	"gpio32",
-	"gpio33",
-	"gpio34",
-	"gpio35",
-	"gpio36",
-	"gpio37",
-	"gpio38",
-	"gpio39",
-	"gpio40",
-	"gpio41",
-	"gpio42",
-	"gpio43",
-	"gpio44",
-	"gpio45",
-	"gpio46",
-	"gpio47",
-	"gpio48",
-	"gpio49",
-	"gpio50",
-	"gpio51",
-	"gpio52",
-	"gpio53",
-};
-
-enum bcm2835_fsel {
-	BCM2835_FSEL_GPIO_IN = 0,
-	BCM2835_FSEL_GPIO_OUT = 1,
-	BCM2835_FSEL_ALT0 = 4,
-	BCM2835_FSEL_ALT1 = 5,
-	BCM2835_FSEL_ALT2 = 6,
-	BCM2835_FSEL_ALT3 = 7,
-	BCM2835_FSEL_ALT4 = 3,
-	BCM2835_FSEL_ALT5 = 2,
-	BCM2835_FSEL_COUNT = 8,
-	BCM2835_FSEL_MASK = 0x7,
-};
-
-static const char * const bcm2835_functions[BCM2835_FSEL_COUNT] = {
-	[BCM2835_FSEL_GPIO_IN] = "gpio_in",
-	[BCM2835_FSEL_GPIO_OUT] = "gpio_out",
-	[BCM2835_FSEL_ALT0] = "alt0",
-	[BCM2835_FSEL_ALT1] = "alt1",
-	[BCM2835_FSEL_ALT2] = "alt2",
-	[BCM2835_FSEL_ALT3] = "alt3",
-	[BCM2835_FSEL_ALT4] = "alt4",
-	[BCM2835_FSEL_ALT5] = "alt5",
-};
-
-static const char * const irq_type_names[] = {
-	[IRQ_TYPE_NONE] = "none",
-	[IRQ_TYPE_EDGE_RISING] = "edge-rising",
-	[IRQ_TYPE_EDGE_FALLING] = "edge-falling",
-	[IRQ_TYPE_EDGE_BOTH] = "edge-both",
-	[IRQ_TYPE_LEVEL_HIGH] = "level-high",
-	[IRQ_TYPE_LEVEL_LOW] = "level-low",
-};
-
-static inline u32 bcm2835_gpio_rd(struct bcm2835_pinctrl *pc, unsigned reg)
-{
-	return readl(pc->base + reg);
-}
-
-static inline void bcm2835_gpio_wr(struct bcm2835_pinctrl *pc, unsigned reg,
-		u32 val)
-{
-	writel(val, pc->base + reg);
-}
-
-static inline int bcm2835_gpio_get_bit(struct bcm2835_pinctrl *pc, unsigned reg,
-		unsigned bit)
-{
-	reg += GPIO_REG_OFFSET(bit) * 4;
-	return (bcm2835_gpio_rd(pc, reg) >> GPIO_REG_SHIFT(bit)) & 1;
-}
-
-/* note NOT a read/modify/write cycle */
-static inline void bcm2835_gpio_set_bit(struct bcm2835_pinctrl *pc,
-		unsigned reg, unsigned bit)
-{
-	reg += GPIO_REG_OFFSET(bit) * 4;
-	bcm2835_gpio_wr(pc, reg, BIT(GPIO_REG_SHIFT(bit)));
-}
-
-static inline enum bcm2835_fsel bcm2835_pinctrl_fsel_get(
-		struct bcm2835_pinctrl *pc, unsigned pin)
-{
-	u32 val = bcm2835_gpio_rd(pc, FSEL_REG(pin));
-	enum bcm2835_fsel status = (val >> FSEL_SHIFT(pin)) & BCM2835_FSEL_MASK;
-
-	dev_dbg(pc->dev, "get %08x (%u => %s)\n", val, pin,
-			bcm2835_functions[status]);
-
-	return status;
-}
-
-static inline void bcm2835_pinctrl_fsel_set(
-		struct bcm2835_pinctrl *pc, unsigned pin,
-		enum bcm2835_fsel fsel)
-{
-	u32 val = bcm2835_gpio_rd(pc, FSEL_REG(pin));
-	enum bcm2835_fsel cur = (val >> FSEL_SHIFT(pin)) & BCM2835_FSEL_MASK;
-
-	dev_dbg(pc->dev, "read %08x (%u => %s)\n", val, pin,
-			bcm2835_functions[cur]);
-
-	if (cur == fsel)
-		return;
-
-	if (cur != BCM2835_FSEL_GPIO_IN && fsel != BCM2835_FSEL_GPIO_IN) {
-		/* always transition through GPIO_IN */
-		val &= ~(BCM2835_FSEL_MASK << FSEL_SHIFT(pin));
-		val |= BCM2835_FSEL_GPIO_IN << FSEL_SHIFT(pin);
-
-		dev_dbg(pc->dev, "trans %08x (%u <= %s)\n", val, pin,
-				bcm2835_functions[BCM2835_FSEL_GPIO_IN]);
-		bcm2835_gpio_wr(pc, FSEL_REG(pin), val);
-	}
-
-	val &= ~(BCM2835_FSEL_MASK << FSEL_SHIFT(pin));
-	val |= fsel << FSEL_SHIFT(pin);
-
-	dev_dbg(pc->dev, "write %08x (%u <= %s)\n", val, pin,
-			bcm2835_functions[fsel]);
-	bcm2835_gpio_wr(pc, FSEL_REG(pin), val);
-}
-
-static int bcm2835_gpio_request(struct gpio_chip *chip, unsigned offset)
-{
-	return pinctrl_request_gpio(chip->base + offset);
-}
-
-static void bcm2835_gpio_free(struct gpio_chip *chip, unsigned offset)
-{
-	pinctrl_free_gpio(chip->base + offset);
-}
-
-static int bcm2835_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
-{
-	return pinctrl_gpio_direction_input(chip->base + offset);
-}
-
-static int bcm2835_gpio_get(struct gpio_chip *chip, unsigned offset)
-{
-	struct bcm2835_pinctrl *pc = dev_get_drvdata(chip->dev);
-
-	return bcm2835_gpio_get_bit(pc, GPLEV0, offset);
-}
-
-static int bcm2835_gpio_direction_output(struct gpio_chip *chip,
-		unsigned offset, int value)
-{
-	return pinctrl_gpio_direction_output(chip->base + offset);
-}
-
-static void bcm2835_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
-{
-	struct bcm2835_pinctrl *pc = dev_get_drvdata(chip->dev);
-
-	bcm2835_gpio_set_bit(pc, value ? GPSET0 : GPCLR0, offset);
-}
-
-static int bcm2835_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
-{
-	struct bcm2835_pinctrl *pc = dev_get_drvdata(chip->dev);
-
-	return irq_linear_revmap(pc->irq_domain, offset);
-}
-
-static struct gpio_chip bcm2835_gpio_chip = {
-	.label = MODULE_NAME,
-	.owner = THIS_MODULE,
-	.request = bcm2835_gpio_request,
-	.free = bcm2835_gpio_free,
-	.direction_input = bcm2835_gpio_direction_input,
-	.direction_output = bcm2835_gpio_direction_output,
-	.get = bcm2835_gpio_get,
-	.set = bcm2835_gpio_set,
-	.to_irq = bcm2835_gpio_to_irq,
-	.base = -1,
-	.ngpio = BCM2835_NUM_GPIOS,
-	.can_sleep = false,
-};
-
-static irqreturn_t bcm2835_gpio_irq_handler(int irq, void *dev_id)
-{
-	struct bcm2835_gpio_irqdata *irqdata = dev_id;
-	struct bcm2835_pinctrl *pc = irqdata->pc;
-	int bank = irqdata->bank;
-	unsigned long events;
-	unsigned offset;
-	unsigned gpio;
-	unsigned int type;
-
-	events = bcm2835_gpio_rd(pc, GPEDS0 + bank * 4);
-	events &= pc->enabled_irq_map[bank];
-	for_each_set_bit(offset, &events, 32) {
-		gpio = (32 * bank) + offset;
-		type = pc->irq_type[gpio];
-
-		/* ack edge triggered IRQs immediately */
-		if (!(type & IRQ_TYPE_LEVEL_MASK))
-			bcm2835_gpio_set_bit(pc, GPEDS0, gpio);
-
-		generic_handle_irq(irq_linear_revmap(pc->irq_domain, gpio));
-
-		/* ack level triggered IRQ after handling them */
-		if (type & IRQ_TYPE_LEVEL_MASK)
-			bcm2835_gpio_set_bit(pc, GPEDS0, gpio);
-	}
-	return events ? IRQ_HANDLED : IRQ_NONE;
-}
-
-static inline void __bcm2835_gpio_irq_config(struct bcm2835_pinctrl *pc,
-	unsigned reg, unsigned offset, bool enable)
-{
-	u32 value;
-	reg += GPIO_REG_OFFSET(offset) * 4;
-	value = bcm2835_gpio_rd(pc, reg);
-	if (enable)
-		value |= BIT(GPIO_REG_SHIFT(offset));
-	else
-		value &= ~(BIT(GPIO_REG_SHIFT(offset)));
-	bcm2835_gpio_wr(pc, reg, value);
-}
-
-/* fast path for IRQ handler */
-static void bcm2835_gpio_irq_config(struct bcm2835_pinctrl *pc,
-	unsigned offset, bool enable)
-{
-	switch (pc->irq_type[offset]) {
-	case IRQ_TYPE_EDGE_RISING:
-		__bcm2835_gpio_irq_config(pc, GPREN0, offset, enable);
-		break;
-
-	case IRQ_TYPE_EDGE_FALLING:
-		__bcm2835_gpio_irq_config(pc, GPFEN0, offset, enable);
-		break;
-
-	case IRQ_TYPE_EDGE_BOTH:
-		__bcm2835_gpio_irq_config(pc, GPREN0, offset, enable);
-		__bcm2835_gpio_irq_config(pc, GPFEN0, offset, enable);
-		break;
-
-	case IRQ_TYPE_LEVEL_HIGH:
-		__bcm2835_gpio_irq_config(pc, GPHEN0, offset, enable);
-		break;
-
-	case IRQ_TYPE_LEVEL_LOW:
-		__bcm2835_gpio_irq_config(pc, GPLEN0, offset, enable);
-		break;
-	}
-}
-
-static void bcm2835_gpio_irq_enable(struct irq_data *data)
-{
-	struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data);
-	unsigned gpio = irqd_to_hwirq(data);
-	unsigned offset = GPIO_REG_SHIFT(gpio);
-	unsigned bank = GPIO_REG_OFFSET(gpio);
-	unsigned long flags;
-
-	spin_lock_irqsave(&pc->irq_lock[bank], flags);
-	set_bit(offset, &pc->enabled_irq_map[bank]);
-	bcm2835_gpio_irq_config(pc, gpio, true);
-	spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
-}
-
-static void bcm2835_gpio_irq_disable(struct irq_data *data)
-{
-	struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data);
-	unsigned gpio = irqd_to_hwirq(data);
-	unsigned offset = GPIO_REG_SHIFT(gpio);
-	unsigned bank = GPIO_REG_OFFSET(gpio);
-	unsigned long flags;
-
-	spin_lock_irqsave(&pc->irq_lock[bank], flags);
-	bcm2835_gpio_irq_config(pc, gpio, false);
-	clear_bit(offset, &pc->enabled_irq_map[bank]);
-	spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
-}
-
-static int __bcm2835_gpio_irq_set_type_disabled(struct bcm2835_pinctrl *pc,
-	unsigned offset, unsigned int type)
-{
-	switch (type) {
-	case IRQ_TYPE_NONE:
-	case IRQ_TYPE_EDGE_RISING:
-	case IRQ_TYPE_EDGE_FALLING:
-	case IRQ_TYPE_EDGE_BOTH:
-	case IRQ_TYPE_LEVEL_HIGH:
-	case IRQ_TYPE_LEVEL_LOW:
-		pc->irq_type[offset] = type;
-		break;
-
-	default:
-		return -EINVAL;
-	}
-	return 0;
-}
-
-/* slower path for reconfiguring IRQ type */
-static int __bcm2835_gpio_irq_set_type_enabled(struct bcm2835_pinctrl *pc,
-	unsigned offset, unsigned int type)
-{
-	switch (type) {
-	case IRQ_TYPE_NONE:
-		if (pc->irq_type[offset] != type) {
-			bcm2835_gpio_irq_config(pc, offset, false);
-			pc->irq_type[offset] = type;
-		}
-		break;
-
-	case IRQ_TYPE_EDGE_RISING:
-		if (pc->irq_type[offset] == IRQ_TYPE_EDGE_BOTH) {
-			/* RISING already enabled, disable FALLING */
-			pc->irq_type[offset] = IRQ_TYPE_EDGE_FALLING;
-			bcm2835_gpio_irq_config(pc, offset, false);
-			pc->irq_type[offset] = type;
-		} else if (pc->irq_type[offset] != type) {
-			bcm2835_gpio_irq_config(pc, offset, false);
-			pc->irq_type[offset] = type;
-			bcm2835_gpio_irq_config(pc, offset, true);
-		}
-		break;
-
-	case IRQ_TYPE_EDGE_FALLING:
-		if (pc->irq_type[offset] == IRQ_TYPE_EDGE_BOTH) {
-			/* FALLING already enabled, disable RISING */
-			pc->irq_type[offset] = IRQ_TYPE_EDGE_RISING;
-			bcm2835_gpio_irq_config(pc, offset, false);
-			pc->irq_type[offset] = type;
-		} else if (pc->irq_type[offset] != type) {
-			bcm2835_gpio_irq_config(pc, offset, false);
-			pc->irq_type[offset] = type;
-			bcm2835_gpio_irq_config(pc, offset, true);
-		}
-		break;
-
-	case IRQ_TYPE_EDGE_BOTH:
-		if (pc->irq_type[offset] == IRQ_TYPE_EDGE_RISING) {
-			/* RISING already enabled, enable FALLING too */
-			pc->irq_type[offset] = IRQ_TYPE_EDGE_FALLING;
-			bcm2835_gpio_irq_config(pc, offset, true);
-			pc->irq_type[offset] = type;
-		} else if (pc->irq_type[offset] == IRQ_TYPE_EDGE_FALLING) {
-			/* FALLING already enabled, enable RISING too */
-			pc->irq_type[offset] = IRQ_TYPE_EDGE_RISING;
-			bcm2835_gpio_irq_config(pc, offset, true);
-			pc->irq_type[offset] = type;
-		} else if (pc->irq_type[offset] != type) {
-			bcm2835_gpio_irq_config(pc, offset, false);
-			pc->irq_type[offset] = type;
-			bcm2835_gpio_irq_config(pc, offset, true);
-		}
-		break;
-
-	case IRQ_TYPE_LEVEL_HIGH:
-	case IRQ_TYPE_LEVEL_LOW:
-		if (pc->irq_type[offset] != type) {
-			bcm2835_gpio_irq_config(pc, offset, false);
-			pc->irq_type[offset] = type;
-			bcm2835_gpio_irq_config(pc, offset, true);
-		}
-		break;
-
-	default:
-		return -EINVAL;
-	}
-	return 0;
-}
-
-static int bcm2835_gpio_irq_set_type(struct irq_data *data, unsigned int type)
-{
-	struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data);
-	unsigned gpio = irqd_to_hwirq(data);
-	unsigned offset = GPIO_REG_SHIFT(gpio);
-	unsigned bank = GPIO_REG_OFFSET(gpio);
-	unsigned long flags;
-	int ret;
-
-	spin_lock_irqsave(&pc->irq_lock[bank], flags);
-
-	if (test_bit(offset, &pc->enabled_irq_map[bank]))
-		ret = __bcm2835_gpio_irq_set_type_enabled(pc, gpio, type);
-	else
-		ret = __bcm2835_gpio_irq_set_type_disabled(pc, gpio, type);
-
-	spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
-
-	return ret;
-}
-
-static struct irq_chip bcm2835_gpio_irq_chip = {
-	.name = MODULE_NAME,
-	.irq_enable = bcm2835_gpio_irq_enable,
-	.irq_disable = bcm2835_gpio_irq_disable,
-	.irq_set_type = bcm2835_gpio_irq_set_type,
-};
-
-static int bcm2835_pctl_get_groups_count(struct pinctrl_dev *pctldev)
-{
-	return ARRAY_SIZE(bcm2835_gpio_groups);
-}
-
-static const char *bcm2835_pctl_get_group_name(struct pinctrl_dev *pctldev,
-		unsigned selector)
-{
-	return bcm2835_gpio_groups[selector];
-}
-
-static int bcm2835_pctl_get_group_pins(struct pinctrl_dev *pctldev,
-		unsigned selector,
-		const unsigned **pins,
-		unsigned *num_pins)
-{
-	*pins = &bcm2835_gpio_pins[selector].number;
-	*num_pins = 1;
-
-	return 0;
-}
-
-static void bcm2835_pctl_pin_dbg_show(struct pinctrl_dev *pctldev,
-		struct seq_file *s,
-		unsigned offset)
-{
-	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
-	enum bcm2835_fsel fsel = bcm2835_pinctrl_fsel_get(pc, offset);
-	const char *fname = bcm2835_functions[fsel];
-	int value = bcm2835_gpio_get_bit(pc, GPLEV0, offset);
-	int irq = irq_find_mapping(pc->irq_domain, offset);
-
-	seq_printf(s, "function %s in %s; irq %d (%s)",
-		fname, value ? "hi" : "lo",
-		irq, irq_type_names[pc->irq_type[offset]]);
-}
-
-static void bcm2835_pctl_dt_free_map(struct pinctrl_dev *pctldev,
-		struct pinctrl_map *maps, unsigned num_maps)
-{
-	int i;
-
-	for (i = 0; i < num_maps; i++)
-		if (maps[i].type == PIN_MAP_TYPE_CONFIGS_PIN)
-			kfree(maps[i].data.configs.configs);
-
-	kfree(maps);
-}
-
-static int bcm2835_pctl_dt_node_to_map_func(struct bcm2835_pinctrl *pc,
-		struct device_node *np, u32 pin, u32 fnum,
-		struct pinctrl_map **maps)
-{
-	struct pinctrl_map *map = *maps;
-
-	if (fnum >= ARRAY_SIZE(bcm2835_functions)) {
-		dev_err(pc->dev, "%s: invalid brcm,function %d\n",
-			of_node_full_name(np), fnum);
-		return -EINVAL;
-	}
-
-	map->type = PIN_MAP_TYPE_MUX_GROUP;
-	map->data.mux.group = bcm2835_gpio_groups[pin];
-	map->data.mux.function = bcm2835_functions[fnum];
-	(*maps)++;
-
-	return 0;
-}
-
-static int bcm2835_pctl_dt_node_to_map_pull(struct bcm2835_pinctrl *pc,
-		struct device_node *np, u32 pin, u32 pull,
-		struct pinctrl_map **maps)
-{
-	struct pinctrl_map *map = *maps;
-	unsigned long *configs;
-
-	if (pull > 2) {
-		dev_err(pc->dev, "%s: invalid brcm,pull %d\n",
-			of_node_full_name(np), pull);
-		return -EINVAL;
-	}
-
-	configs = kzalloc(sizeof(*configs), GFP_KERNEL);
-	if (!configs)
-		return -ENOMEM;
-	configs[0] = BCM2835_PINCONF_PACK(BCM2835_PINCONF_PARAM_PULL, pull);
-
-	map->type = PIN_MAP_TYPE_CONFIGS_PIN;
-	map->data.configs.group_or_pin = bcm2835_gpio_pins[pin].name;
-	map->data.configs.configs = configs;
-	map->data.configs.num_configs = 1;
-	(*maps)++;
-
-	return 0;
-}
-
-static int bcm2835_pctl_dt_node_to_map(struct pinctrl_dev *pctldev,
-		struct device_node *np,
-		struct pinctrl_map **map, unsigned *num_maps)
-{
-	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
-	struct property *pins, *funcs, *pulls;
-	int num_pins, num_funcs, num_pulls, maps_per_pin;
-	struct pinctrl_map *maps, *cur_map;
-	int i, err;
-	u32 pin, func, pull;
-
-	pins = of_find_property(np, "brcm,pins", NULL);
-	if (!pins) {
-		dev_err(pc->dev, "%s: missing brcm,pins property\n",
-				of_node_full_name(np));
-		return -EINVAL;
-	}
-
-	funcs = of_find_property(np, "brcm,function", NULL);
-	pulls = of_find_property(np, "brcm,pull", NULL);
-
-	if (!funcs && !pulls) {
-		dev_err(pc->dev,
-			"%s: neither brcm,function nor brcm,pull specified\n",
-			of_node_full_name(np));
-		return -EINVAL;
-	}
-
-	num_pins = pins->length / 4;
-	num_funcs = funcs ? (funcs->length / 4) : 0;
-	num_pulls = pulls ? (pulls->length / 4) : 0;
-
-	if (num_funcs > 1 && num_funcs != num_pins) {
-		dev_err(pc->dev,
-			"%s: brcm,function must have 1 or %d entries\n",
-			of_node_full_name(np), num_pins);
-		return -EINVAL;
-	}
-
-	if (num_pulls > 1 && num_pulls != num_pins) {
-		dev_err(pc->dev,
-			"%s: brcm,pull must have 1 or %d entries\n",
-			of_node_full_name(np), num_pins);
-		return -EINVAL;
-	}
-
-	maps_per_pin = 0;
-	if (num_funcs)
-		maps_per_pin++;
-	if (num_pulls)
-		maps_per_pin++;
-	cur_map = maps = kzalloc(num_pins * maps_per_pin * sizeof(*maps),
-				GFP_KERNEL);
-	if (!maps)
-		return -ENOMEM;
-
-	for (i = 0; i < num_pins; i++) {
-		err = of_property_read_u32_index(np, "brcm,pins", i, &pin);
-		if (err)
-			goto out;
-		if (pin >= ARRAY_SIZE(bcm2835_gpio_pins)) {
-			dev_err(pc->dev, "%s: invalid brcm,pins value %d\n",
-				of_node_full_name(np), pin);
-			err = -EINVAL;
-			goto out;
-		}
-
-		if (num_funcs) {
-			err = of_property_read_u32_index(np, "brcm,function",
-					(num_funcs > 1) ? i : 0, &func);
-			if (err)
-				goto out;
-			err = bcm2835_pctl_dt_node_to_map_func(pc, np, pin,
-							func, &cur_map);
-			if (err)
-				goto out;
-		}
-		if (num_pulls) {
-			err = of_property_read_u32_index(np, "brcm,pull",
-					(num_funcs > 1) ? i : 0, &pull);
-			if (err)
-				goto out;
-			err = bcm2835_pctl_dt_node_to_map_pull(pc, np, pin,
-							pull, &cur_map);
-			if (err)
-				goto out;
-		}
-	}
-
-	*map = maps;
-	*num_maps = num_pins * maps_per_pin;
-
-	return 0;
-
-out:
-	kfree(maps);
-	return err;
-}
-
-static const struct pinctrl_ops bcm2835_pctl_ops = {
-	.get_groups_count = bcm2835_pctl_get_groups_count,
-	.get_group_name = bcm2835_pctl_get_group_name,
-	.get_group_pins = bcm2835_pctl_get_group_pins,
-	.pin_dbg_show = bcm2835_pctl_pin_dbg_show,
-	.dt_node_to_map = bcm2835_pctl_dt_node_to_map,
-	.dt_free_map = bcm2835_pctl_dt_free_map,
-};
-
-static int bcm2835_pmx_get_functions_count(struct pinctrl_dev *pctldev)
-{
-	return BCM2835_FSEL_COUNT;
-}
-
-static const char *bcm2835_pmx_get_function_name(struct pinctrl_dev *pctldev,
-		unsigned selector)
-{
-	return bcm2835_functions[selector];
-}
-
-static int bcm2835_pmx_get_function_groups(struct pinctrl_dev *pctldev,
-		unsigned selector,
-		const char * const **groups,
-		unsigned * const num_groups)
-{
-	/* every pin can do every function */
-	*groups = bcm2835_gpio_groups;
-	*num_groups = ARRAY_SIZE(bcm2835_gpio_groups);
-
-	return 0;
-}
-
-static int bcm2835_pmx_set(struct pinctrl_dev *pctldev,
-		unsigned func_selector,
-		unsigned group_selector)
-{
-	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
-
-	bcm2835_pinctrl_fsel_set(pc, group_selector, func_selector);
-
-	return 0;
-}
-
-static void bcm2835_pmx_gpio_disable_free(struct pinctrl_dev *pctldev,
-		struct pinctrl_gpio_range *range,
-		unsigned offset)
-{
-	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
-
-	/* disable by setting to GPIO_IN */
-	bcm2835_pinctrl_fsel_set(pc, offset, BCM2835_FSEL_GPIO_IN);
-}
-
-static int bcm2835_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
-		struct pinctrl_gpio_range *range,
-		unsigned offset,
-		bool input)
-{
-	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
-	enum bcm2835_fsel fsel = input ?
-		BCM2835_FSEL_GPIO_IN : BCM2835_FSEL_GPIO_OUT;
-
-	bcm2835_pinctrl_fsel_set(pc, offset, fsel);
-
-	return 0;
-}
-
-static const struct pinmux_ops bcm2835_pmx_ops = {
-	.get_functions_count = bcm2835_pmx_get_functions_count,
-	.get_function_name = bcm2835_pmx_get_function_name,
-	.get_function_groups = bcm2835_pmx_get_function_groups,
-	.set_mux = bcm2835_pmx_set,
-	.gpio_disable_free = bcm2835_pmx_gpio_disable_free,
-	.gpio_set_direction = bcm2835_pmx_gpio_set_direction,
-};
-
-static int bcm2835_pinconf_get(struct pinctrl_dev *pctldev,
-			unsigned pin, unsigned long *config)
-{
-	/* No way to read back config in HW */
-	return -ENOTSUPP;
-}
-
-static int bcm2835_pinconf_set(struct pinctrl_dev *pctldev,
-			unsigned pin, unsigned long *configs,
-			unsigned num_configs)
-{
-	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
-	enum bcm2835_pinconf_param param;
-	u16 arg;
-	u32 off, bit;
-	int i;
-
-	for (i = 0; i < num_configs; i++) {
-		param = BCM2835_PINCONF_UNPACK_PARAM(configs[i]);
-		arg = BCM2835_PINCONF_UNPACK_ARG(configs[i]);
-
-		if (param != BCM2835_PINCONF_PARAM_PULL)
-			return -EINVAL;
-
-		off = GPIO_REG_OFFSET(pin);
-		bit = GPIO_REG_SHIFT(pin);
-
-		bcm2835_gpio_wr(pc, GPPUD, arg & 3);
-		/*
-		 * Docs say to wait 150 cycles, but not of what. We assume a
-		 * 1 MHz clock here, which is pretty slow...
-		 */
-		udelay(150);
-		bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), BIT(bit));
-		udelay(150);
-		bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), 0);
-	} /* for each config */
-
-	return 0;
-}
-
-static const struct pinconf_ops bcm2835_pinconf_ops = {
-	.pin_config_get = bcm2835_pinconf_get,
-	.pin_config_set = bcm2835_pinconf_set,
-};
-
-static struct pinctrl_desc bcm2835_pinctrl_desc = {
-	.name = MODULE_NAME,
-	.pins = bcm2835_gpio_pins,
-	.npins = ARRAY_SIZE(bcm2835_gpio_pins),
-	.pctlops = &bcm2835_pctl_ops,
-	.pmxops = &bcm2835_pmx_ops,
-	.confops = &bcm2835_pinconf_ops,
-	.owner = THIS_MODULE,
-};
-
-static struct pinctrl_gpio_range bcm2835_pinctrl_gpio_range = {
-	.name = MODULE_NAME,
-	.npins = BCM2835_NUM_GPIOS,
-};
-
-static int bcm2835_pinctrl_probe(struct platform_device *pdev)
-{
-	struct device *dev = &pdev->dev;
-	struct device_node *np = dev->of_node;
-	struct bcm2835_pinctrl *pc;
-	struct resource iomem;
-	int err, i;
-	BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_pins) != BCM2835_NUM_GPIOS);
-	BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_groups) != BCM2835_NUM_GPIOS);
-
-	pc = devm_kzalloc(dev, sizeof(*pc), GFP_KERNEL);
-	if (!pc)
-		return -ENOMEM;
-
-	platform_set_drvdata(pdev, pc);
-	pc->dev = dev;
-
-	err = of_address_to_resource(np, 0, &iomem);
-	if (err) {
-		dev_err(dev, "could not get IO memory\n");
-		return err;
-	}
-
-	pc->base = devm_ioremap_resource(dev, &iomem);
-	if (IS_ERR(pc->base))
-		return PTR_ERR(pc->base);
-
-	pc->gpio_chip = bcm2835_gpio_chip;
-	pc->gpio_chip.dev = dev;
-	pc->gpio_chip.of_node = np;
-
-	pc->irq_domain = irq_domain_add_linear(np, BCM2835_NUM_GPIOS,
-			&irq_domain_simple_ops, NULL);
-	if (!pc->irq_domain) {
-		dev_err(dev, "could not create IRQ domain\n");
-		return -ENOMEM;
-	}
-
-	for (i = 0; i < BCM2835_NUM_GPIOS; i++) {
-		int irq = irq_create_mapping(pc->irq_domain, i);
-		irq_set_lockdep_class(irq, &gpio_lock_class);
-		irq_set_chip_and_handler(irq, &bcm2835_gpio_irq_chip,
-				handle_simple_irq);
-		irq_set_chip_data(irq, pc);
-		set_irq_flags(irq, IRQF_VALID);
-	}
-
-	for (i = 0; i < BCM2835_NUM_BANKS; i++) {
-		unsigned long events;
-		unsigned offset;
-		int len;
-		char *name;
-
-		/* clear event detection flags */
-		bcm2835_gpio_wr(pc, GPREN0 + i * 4, 0);
-		bcm2835_gpio_wr(pc, GPFEN0 + i * 4, 0);
-		bcm2835_gpio_wr(pc, GPHEN0 + i * 4, 0);
-		bcm2835_gpio_wr(pc, GPLEN0 + i * 4, 0);
-		bcm2835_gpio_wr(pc, GPAREN0 + i * 4, 0);
-		bcm2835_gpio_wr(pc, GPAFEN0 + i * 4, 0);
-
-		/* clear all the events */
-		events = bcm2835_gpio_rd(pc, GPEDS0 + i * 4);
-		for_each_set_bit(offset, &events, 32)
-			bcm2835_gpio_wr(pc, GPEDS0 + i * 4, BIT(offset));
-
-		pc->irq[i] = irq_of_parse_and_map(np, i);
-		pc->irq_data[i].pc = pc;
-		pc->irq_data[i].bank = i;
-		spin_lock_init(&pc->irq_lock[i]);
-
-		len = strlen(dev_name(pc->dev)) + 16;
-		name = devm_kzalloc(pc->dev, len, GFP_KERNEL);
-		if (!name)
-			return -ENOMEM;
-		snprintf(name, len, "%s:bank%d", dev_name(pc->dev), i);
-
-		err = devm_request_irq(dev, pc->irq[i],
-			bcm2835_gpio_irq_handler, IRQF_SHARED,
-			name, &pc->irq_data[i]);
-		if (err) {
-			dev_err(dev, "unable to request IRQ %d\n", pc->irq[i]);
-			return err;
-		}
-	}
-
-	err = gpiochip_add(&pc->gpio_chip);
-	if (err) {
-		dev_err(dev, "could not add GPIO chip\n");
-		return err;
-	}
-
-	pc->pctl_dev = pinctrl_register(&bcm2835_pinctrl_desc, dev, pc);
-	if (!pc->pctl_dev) {
-		gpiochip_remove(&pc->gpio_chip);
-		return -EINVAL;
-	}
-
-	pc->gpio_range = bcm2835_pinctrl_gpio_range;
-	pc->gpio_range.base = pc->gpio_chip.base;
-	pc->gpio_range.gc = &pc->gpio_chip;
-	pinctrl_add_gpio_range(pc->pctl_dev, &pc->gpio_range);
-
-	return 0;
-}
-
-static int bcm2835_pinctrl_remove(struct platform_device *pdev)
-{
-	struct bcm2835_pinctrl *pc = platform_get_drvdata(pdev);
-
-	pinctrl_unregister(pc->pctl_dev);
-	gpiochip_remove(&pc->gpio_chip);
-
-	return 0;
-}
-
-static struct of_device_id bcm2835_pinctrl_match[] = {
-	{ .compatible = "brcm,bcm2835-gpio" },
-	{}
-};
-MODULE_DEVICE_TABLE(of, bcm2835_pinctrl_match);
-
-static struct platform_driver bcm2835_pinctrl_driver = {
-	.probe = bcm2835_pinctrl_probe,
-	.remove = bcm2835_pinctrl_remove,
-	.driver = {
-		.name = MODULE_NAME,
-		.of_match_table = bcm2835_pinctrl_match,
-	},
-};
-module_platform_driver(bcm2835_pinctrl_driver);
-
-MODULE_AUTHOR("Chris Boot, Simon Arlott, Stephen Warren");
-MODULE_DESCRIPTION("BCM2835 Pin control driver");
-MODULE_LICENSE("GPL");
-- 
1.7.9.5

[PATCH v3 2/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Ray Jui]

Device tree binding documentation for Broadcom Cygnus IOMUX driver

Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
---
 .../bindings/pinctrl/brcm,cygnus-pinmux.txt        |  159 ++++++++++++++++++++
 1 file changed, 159 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinmux.txt

diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinmux.txt b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinmux.txt
new file mode 100644
index 0000000..1082b8b
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinmux.txt
@@ -0,0 +1,159 @@
+Broadcom Cygnus IOMUX Controller
+
+The Cygnus IOMUX controller supports group based mux configuration. In
+addition, certain pins can be muxed to GPIO function individually.
+
+Required properties:
+
+- compatible:
+    Must be "brcm,cygnus-pinmux"
+
+- reg:
+    Define the base and range of the I/O address space that contains the Cygnus
+IOMUX registers
+
+Required properties in child nodes:
+
+- function:
+    The mux function to select
+
+- groups:
+    The list of groups to select with a given function
+
+Each child node represents a configuration. Client devices reference the child
+node to enable a mux configuration
+
+For more details, refer to
+Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
+
+For example:
+
+	pinmux: pinmux@0x0301d0c8 {
+		compatible = "brcm,cygnus-pinmux";
+		reg = <0x0301d0c8 0x1b0>;
+
+		i2s_0: i2s_0 {
+			function = "i2s0";
+			groups = "i2s0_0_grp", "i2s0_1_grp";
+		};
+
+		i2s_1: i2s_1 {
+			function = "i2s1";
+			groups = "i2s1_0_grp", "i2s1_1_grp";
+		};
+
+		i2s_2: i2s_2 {
+			function = "i2s2";
+			groups = "i2s2_0_grp", "i2s2_1_grp", "i2s2_2_grp",
+				 "i2s2_3_grp", "i2s2_4_grp";
+		};
+
+		spi_0: spi_0 {
+			function = "spi0";
+			groups = "spi0_grp";
+		};
+	}
+
+	spi0@18028000 {
+			compatible = "arm,pl022", "arm,primecell";
+			reg = <0x18028000 0x1000>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			interrupts = <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>;
+			pinctrl-0 = <&spi_0>;
+			clocks = <&axi81_clk>;
+			clock-names = "apb_pclk";
+	};
+
+List of supported functions and groups in Cygnus:
+
+"gpio": N/A (to be removed for A0)
+
+"i2s0": "i2s0_0_grp", "i2s0_1_grp"
+
+"i2s1": "i2s1_0_grp", "i2s1_1_grp"
+
+"i2s2": "i2s2_0_grp", "i2s2_1_grp", "i2s2_2_grp", "i2s2_3_grp", "i2s2_4_grp"
+
+"spdif": "spdif_grp"
+
+"pwm0": "pwm0_grp"
+
+"pwm1": "pwm1_grp"
+
+"pwm2": "pwm2_grp"
+
+"pwm3": "pwm3_grp"
+
+"pwm4": "pwm4_grp"
+
+"pwm5": "pwm5_grp"
+
+"key": "key0_grp", "key1_grp", "key2_grp", "key3_grp", "key4_grp", "key5_grp",
+"key6_grp", "key7_grp", "key8_grp", "key9_grp", "key10_grp", "key11_grp",
+"key12_grp", "key13_grp", "key14_grp", "key15_grp"
+
+"audio_dte": "audio_dte0_grp", "audio_dte1_grp", "audio_dte2_grp", "audio_dte3_grp"
+
+"smart_card0": "smart_card0_grp", "smart_card0_fcb_grp"
+
+"smart_card1": "smart_card1_grp", "smart_card1_fcb_grp"
+
+"spi0": "spi0_grp"
+
+"spi1": "spi1_grp"
+
+"spi2": "spi2_grp"
+
+"spi3": "spi3_grp"
+
+"spi4": "spi4_0_grp", "spi4_1_grp"
+
+"spi5": "spi5_grp"
+
+"sw_led0": "sw_led0_0_grp", "sw_led0_1_grp"
+
+"sw_led1": "sw_led1_grp"
+
+"sw_led2": "sw_led2_0_grp", "sw_led2_1_grp"
+
+"d1w": "d1w_grp"
+
+"lcd": "lcd_grp"
+
+"sram": "sram_0_grp", "sram_1_grp"
+
+"uart0": "uart0_grp"
+
+"uart1": "uart1_grp", "uart1_dte_grp"
+
+"uart2": "uart2_grp"
+
+"uart3": "uart3_grp"
+
+"uart4": "uart4_grp"
+
+"qspi": "qspi_0_grp", "qspi_1_grp"
+
+"nand": "nand_grp"
+
+"sdio0": "sdio0_grp", "sdio0_cd_grp", "sdio0_mmc_grp"
+
+"sdio1": "sdio1_data_0_grp", "sdio1_data_1_grp", "sdio1_cd_grp",
+"sdio1_led_grp", "sdio1_mmc_grp"
+
+"can0": "can0_grp"
+
+"can1": "can1_grp"
+
+"cam": "cam_led_grp", "cam_0_grp", "cam_1_grp"
+
+"bsc1": "bsc1_grp"
+
+"pcie_clkreq": "pcie_clkreq_grp"
+
+"usb0_oc": "usb0_oc_grp"
+
+"usb1_oc": "usb1_oc_grp"
+
+"usb2_oc": "usb2_oc_grp"
-- 
1.7.9.5

--
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[PATCH v3 2/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Ray Jui]

Device tree binding documentation for Broadcom Cygnus IOMUX driver

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../bindings/pinctrl/brcm,cygnus-pinmux.txt        |  159 ++++++++++++++++++++
 1 file changed, 159 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinmux.txt

diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinmux.txt b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinmux.txt
new file mode 100644
index 0000000..1082b8b
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinmux.txt
@@ -0,0 +1,159 @@
+Broadcom Cygnus IOMUX Controller
+
+The Cygnus IOMUX controller supports group based mux configuration. In
+addition, certain pins can be muxed to GPIO function individually.
+
+Required properties:
+
+- compatible:
+    Must be "brcm,cygnus-pinmux"
+
+- reg:
+    Define the base and range of the I/O address space that contains the Cygnus
+IOMUX registers
+
+Required properties in child nodes:
+
+- function:
+    The mux function to select
+
+- groups:
+    The list of groups to select with a given function
+
+Each child node represents a configuration. Client devices reference the child
+node to enable a mux configuration
+
+For more details, refer to
+Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
+
+For example:
+
+	pinmux: pinmux@0x0301d0c8 {
+		compatible = "brcm,cygnus-pinmux";
+		reg = <0x0301d0c8 0x1b0>;
+
+		i2s_0: i2s_0 {
+			function = "i2s0";
+			groups = "i2s0_0_grp", "i2s0_1_grp";
+		};
+
+		i2s_1: i2s_1 {
+			function = "i2s1";
+			groups = "i2s1_0_grp", "i2s1_1_grp";
+		};
+
+		i2s_2: i2s_2 {
+			function = "i2s2";
+			groups = "i2s2_0_grp", "i2s2_1_grp", "i2s2_2_grp",
+				 "i2s2_3_grp", "i2s2_4_grp";
+		};
+
+		spi_0: spi_0 {
+			function = "spi0";
+			groups = "spi0_grp";
+		};
+	}
+
+	spi0@18028000 {
+			compatible = "arm,pl022", "arm,primecell";
+			reg = <0x18028000 0x1000>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			interrupts = <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>;
+			pinctrl-0 = <&spi_0>;
+			clocks = <&axi81_clk>;
+			clock-names = "apb_pclk";
+	};
+
+List of supported functions and groups in Cygnus:
+
+"gpio": N/A (to be removed for A0)
+
+"i2s0": "i2s0_0_grp", "i2s0_1_grp"
+
+"i2s1": "i2s1_0_grp", "i2s1_1_grp"
+
+"i2s2": "i2s2_0_grp", "i2s2_1_grp", "i2s2_2_grp", "i2s2_3_grp", "i2s2_4_grp"
+
+"spdif": "spdif_grp"
+
+"pwm0": "pwm0_grp"
+
+"pwm1": "pwm1_grp"
+
+"pwm2": "pwm2_grp"
+
+"pwm3": "pwm3_grp"
+
+"pwm4": "pwm4_grp"
+
+"pwm5": "pwm5_grp"
+
+"key": "key0_grp", "key1_grp", "key2_grp", "key3_grp", "key4_grp", "key5_grp",
+"key6_grp", "key7_grp", "key8_grp", "key9_grp", "key10_grp", "key11_grp",
+"key12_grp", "key13_grp", "key14_grp", "key15_grp"
+
+"audio_dte": "audio_dte0_grp", "audio_dte1_grp", "audio_dte2_grp", "audio_dte3_grp"
+
+"smart_card0": "smart_card0_grp", "smart_card0_fcb_grp"
+
+"smart_card1": "smart_card1_grp", "smart_card1_fcb_grp"
+
+"spi0": "spi0_grp"
+
+"spi1": "spi1_grp"
+
+"spi2": "spi2_grp"
+
+"spi3": "spi3_grp"
+
+"spi4": "spi4_0_grp", "spi4_1_grp"
+
+"spi5": "spi5_grp"
+
+"sw_led0": "sw_led0_0_grp", "sw_led0_1_grp"
+
+"sw_led1": "sw_led1_grp"
+
+"sw_led2": "sw_led2_0_grp", "sw_led2_1_grp"
+
+"d1w": "d1w_grp"
+
+"lcd": "lcd_grp"
+
+"sram": "sram_0_grp", "sram_1_grp"
+
+"uart0": "uart0_grp"
+
+"uart1": "uart1_grp", "uart1_dte_grp"
+
+"uart2": "uart2_grp"
+
+"uart3": "uart3_grp"
+
+"uart4": "uart4_grp"
+
+"qspi": "qspi_0_grp", "qspi_1_grp"
+
+"nand": "nand_grp"
+
+"sdio0": "sdio0_grp", "sdio0_cd_grp", "sdio0_mmc_grp"
+
+"sdio1": "sdio1_data_0_grp", "sdio1_data_1_grp", "sdio1_cd_grp",
+"sdio1_led_grp", "sdio1_mmc_grp"
+
+"can0": "can0_grp"
+
+"can1": "can1_grp"
+
+"cam": "cam_led_grp", "cam_0_grp", "cam_1_grp"
+
+"bsc1": "bsc1_grp"
+
+"pcie_clkreq": "pcie_clkreq_grp"
+
+"usb0_oc": "usb0_oc_grp"
+
+"usb1_oc": "usb1_oc_grp"
+
+"usb2_oc": "usb2_oc_grp"
-- 
1.7.9.5

[PATCH v3 2/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Ray Jui]

Device tree binding documentation for Broadcom Cygnus IOMUX driver

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../bindings/pinctrl/brcm,cygnus-pinmux.txt        |  159 ++++++++++++++++++++
 1 file changed, 159 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinmux.txt

diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinmux.txt b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinmux.txt
new file mode 100644
index 0000000..1082b8b
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinmux.txt
@@ -0,0 +1,159 @@
+Broadcom Cygnus IOMUX Controller
+
+The Cygnus IOMUX controller supports group based mux configuration. In
+addition, certain pins can be muxed to GPIO function individually.
+
+Required properties:
+
+- compatible:
+    Must be "brcm,cygnus-pinmux"
+
+- reg:
+    Define the base and range of the I/O address space that contains the Cygnus
+IOMUX registers
+
+Required properties in child nodes:
+
+- function:
+    The mux function to select
+
+- groups:
+    The list of groups to select with a given function
+
+Each child node represents a configuration. Client devices reference the child
+node to enable a mux configuration
+
+For more details, refer to
+Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
+
+For example:
+
+	pinmux: pinmux at 0x0301d0c8 {
+		compatible = "brcm,cygnus-pinmux";
+		reg = <0x0301d0c8 0x1b0>;
+
+		i2s_0: i2s_0 {
+			function = "i2s0";
+			groups = "i2s0_0_grp", "i2s0_1_grp";
+		};
+
+		i2s_1: i2s_1 {
+			function = "i2s1";
+			groups = "i2s1_0_grp", "i2s1_1_grp";
+		};
+
+		i2s_2: i2s_2 {
+			function = "i2s2";
+			groups = "i2s2_0_grp", "i2s2_1_grp", "i2s2_2_grp",
+				 "i2s2_3_grp", "i2s2_4_grp";
+		};
+
+		spi_0: spi_0 {
+			function = "spi0";
+			groups = "spi0_grp";
+		};
+	}
+
+	spi0 at 18028000 {
+			compatible = "arm,pl022", "arm,primecell";
+			reg = <0x18028000 0x1000>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			interrupts = <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>;
+			pinctrl-0 = <&spi_0>;
+			clocks = <&axi81_clk>;
+			clock-names = "apb_pclk";
+	};
+
+List of supported functions and groups in Cygnus:
+
+"gpio": N/A (to be removed for A0)
+
+"i2s0": "i2s0_0_grp", "i2s0_1_grp"
+
+"i2s1": "i2s1_0_grp", "i2s1_1_grp"
+
+"i2s2": "i2s2_0_grp", "i2s2_1_grp", "i2s2_2_grp", "i2s2_3_grp", "i2s2_4_grp"
+
+"spdif": "spdif_grp"
+
+"pwm0": "pwm0_grp"
+
+"pwm1": "pwm1_grp"
+
+"pwm2": "pwm2_grp"
+
+"pwm3": "pwm3_grp"
+
+"pwm4": "pwm4_grp"
+
+"pwm5": "pwm5_grp"
+
+"key": "key0_grp", "key1_grp", "key2_grp", "key3_grp", "key4_grp", "key5_grp",
+"key6_grp", "key7_grp", "key8_grp", "key9_grp", "key10_grp", "key11_grp",
+"key12_grp", "key13_grp", "key14_grp", "key15_grp"
+
+"audio_dte": "audio_dte0_grp", "audio_dte1_grp", "audio_dte2_grp", "audio_dte3_grp"
+
+"smart_card0": "smart_card0_grp", "smart_card0_fcb_grp"
+
+"smart_card1": "smart_card1_grp", "smart_card1_fcb_grp"
+
+"spi0": "spi0_grp"
+
+"spi1": "spi1_grp"
+
+"spi2": "spi2_grp"
+
+"spi3": "spi3_grp"
+
+"spi4": "spi4_0_grp", "spi4_1_grp"
+
+"spi5": "spi5_grp"
+
+"sw_led0": "sw_led0_0_grp", "sw_led0_1_grp"
+
+"sw_led1": "sw_led1_grp"
+
+"sw_led2": "sw_led2_0_grp", "sw_led2_1_grp"
+
+"d1w": "d1w_grp"
+
+"lcd": "lcd_grp"
+
+"sram": "sram_0_grp", "sram_1_grp"
+
+"uart0": "uart0_grp"
+
+"uart1": "uart1_grp", "uart1_dte_grp"
+
+"uart2": "uart2_grp"
+
+"uart3": "uart3_grp"
+
+"uart4": "uart4_grp"
+
+"qspi": "qspi_0_grp", "qspi_1_grp"
+
+"nand": "nand_grp"
+
+"sdio0": "sdio0_grp", "sdio0_cd_grp", "sdio0_mmc_grp"
+
+"sdio1": "sdio1_data_0_grp", "sdio1_data_1_grp", "sdio1_cd_grp",
+"sdio1_led_grp", "sdio1_mmc_grp"
+
+"can0": "can0_grp"
+
+"can1": "can1_grp"
+
+"cam": "cam_led_grp", "cam_0_grp", "cam_1_grp"
+
+"bsc1": "bsc1_grp"
+
+"pcie_clkreq": "pcie_clkreq_grp"
+
+"usb0_oc": "usb0_oc_grp"
+
+"usb1_oc": "usb1_oc_grp"
+
+"usb2_oc": "usb2_oc_grp"
-- 
1.7.9.5

[PATCH v3 3/4] pinctrl: cygnus: add initial IOMUX driver support

[Ray Jui]

This adds the initial driver support for the Broadcom Cygnus IOMUX
controller. The Cygnus IOMUX controller supports group based mux
configuration but allows certain pins to be muxed to GPIO individually

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/pinctrl/bcm/Kconfig              |   13 +
 drivers/pinctrl/bcm/Makefile             |    5 +-
 drivers/pinctrl/bcm/pinctrl-cygnus-mux.c | 1087 ++++++++++++++++++++++++++++++
 3 files changed, 1103 insertions(+), 2 deletions(-)
 create mode 100644 drivers/pinctrl/bcm/pinctrl-cygnus-mux.c

diff --git a/drivers/pinctrl/bcm/Kconfig b/drivers/pinctrl/bcm/Kconfig
index bc6d048..eb13201 100644
--- a/drivers/pinctrl/bcm/Kconfig
+++ b/drivers/pinctrl/bcm/Kconfig
@@ -19,3 +19,16 @@ config PINCTRL_BCM2835
 	bool
 	select PINMUX
 	select PINCONF
+
+config PINCTRL_CYGNUS_MUX
+	bool "Broadcom Cygnus IOMUX driver"
+	depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
+	select PINMUX
+	select GENERIC_PINCONF
+	default ARCH_BCM_CYGNUS
+	help
+	  Say yes here to enable the Broadcom Cygnus IOMUX driver.
+
+	  The Broadcom Cygnus IOMUX driver supports group based IOMUX
+	  configuration, with the exception that certain individual pins
+	  can be overrided to GPIO function
diff --git a/drivers/pinctrl/bcm/Makefile b/drivers/pinctrl/bcm/Makefile
index 7ba80a3..bb6beb6 100644
--- a/drivers/pinctrl/bcm/Makefile
+++ b/drivers/pinctrl/bcm/Makefile
@@ -1,4 +1,5 @@
 # Broadcom pinctrl support
 
-obj-$(CONFIG_PINCTRL_BCM281XX)	+= pinctrl-bcm281xx.o
-obj-$(CONFIG_PINCTRL_BCM2835)	+= pinctrl-bcm2835.o
+obj-$(CONFIG_PINCTRL_BCM281XX)		+= pinctrl-bcm281xx.o
+obj-$(CONFIG_PINCTRL_BCM2835)		+= pinctrl-bcm2835.o
+obj-$(CONFIG_PINCTRL_CYGNUS_MUX)	+= pinctrl-cygnus-mux.o
diff --git a/drivers/pinctrl/bcm/pinctrl-cygnus-mux.c b/drivers/pinctrl/bcm/pinctrl-cygnus-mux.c
new file mode 100644
index 0000000..33565b4
--- /dev/null
+++ b/drivers/pinctrl/bcm/pinctrl-cygnus-mux.c
@@ -0,0 +1,1087 @@
+/* Copyright (C) 2014-2015 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * This file contains the Cygnus IOMUX driver that supports group based PINMUX
+ * configuration. Although PINMUX configuration is mainly group based, the
+ * Cygnus IOMUX controller allows certain pins to be individually muxed to GPIO
+ * function, and therefore be controlled by the Cygnus ASIU GPIO controller
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include "../core.h"
+#include "../pinctrl-utils.h"
+
+#define CYGNUS_NUM_IOMUX_REGS     8
+#define CYGNUS_NUM_MUX_PER_REG    8
+#define CYGNUS_NUM_IOMUX          (CYGNUS_NUM_IOMUX_REGS * \
+				   CYGNUS_NUM_MUX_PER_REG)
+
+/*
+ * Cygnus IOMUX register description
+ *
+ * @offset: register offset for mux configuration of a group
+ * @shift: bit shift for mux configuration of a group
+ * @alt: alternate function to set to
+ */
+struct cygnus_mux {
+	unsigned int offset;
+	unsigned int shift;
+	unsigned int alt;
+};
+
+/*
+ * Keep track of Cygnus IOMUX configuration and prevent double configuration
+ *
+ * @cygnus_mux: Cygnus IOMUX register description
+ * @is_configured: flag to indicate whether a mux setting has already been
+ * configured
+ */
+struct cygnus_mux_log {
+	struct cygnus_mux mux;
+	bool is_configured;
+};
+
+/*
+ * Group based IOMUX configuration
+ *
+ * @name: name of the group
+ * @pins: array of pins used by this group
+ * @num_pins: total number of pins used by this group
+ * @mux: Cygnus group based IOMUX configuration
+ */
+struct cygnus_pin_group {
+	const char *name;
+	const unsigned *pins;
+	const unsigned num_pins;
+	const struct cygnus_mux mux;
+};
+
+/*
+ * Cygnus mux function and supported pin groups
+ *
+ * @name: name of the function
+ * @groups: array of groups that can be supported by this function
+ * @num_groups: total number of groups that can be supported by this function
+ */
+struct cygnus_pin_function {
+	const char *name;
+	const char * const *groups;
+	const unsigned num_groups;
+};
+
+/*
+ * Cygnus IOMUX pinctrl core
+ *
+ * @pctl: pointer to pinctrl_dev
+ * @dev: pointer to device
+ * @base0: first I/O register base of the Cygnus IOMUX controller
+ * @base1: second I/O register base
+ * @groups: pointer to array of groups
+ * @num_groups: total number of groups
+ * @functions: pointer to array of functions
+ * @num_functions: total number of functions
+ * @mux_log: pointer to the array of mux logs
+ * @lock: lock to protect register access
+ */
+struct cygnus_pinctrl {
+	struct pinctrl_dev *pctl;
+	struct device *dev;
+	void __iomem *base0;
+	void __iomem *base1;
+
+	const struct cygnus_pin_group *groups;
+	unsigned num_groups;
+
+	const struct cygnus_pin_function *functions;
+	unsigned num_functions;
+
+	struct cygnus_mux_log *mux_log;
+
+	spinlock_t lock;
+};
+
+/*
+ * Certain pins can be individually muxed to GPIO function
+ *
+ * @is_supported: flag to indicate GPIO mux is supported for this pin
+ * @offset: register offset for GPIO mux override of a pin
+ * @shift: bit shift for GPIO mux override of a pin
+ */
+struct cygnus_gpio_mux {
+	int is_supported;
+	unsigned int offset;
+	unsigned int shift;
+};
+
+/*
+ * Description of a pin in Cygnus
+ *
+ * @pin: pin number
+ * @name: pin name
+ * @gpio_mux: GPIO override related information
+ */
+struct cygnus_pin {
+	unsigned pin;
+	char *name;
+	struct cygnus_gpio_mux gpio_mux;
+};
+
+#define CYGNUS_PIN_DESC(p, n, i, o, s)	\
+{					\
+	.pin = p,			\
+	.name = n,			\
+	.gpio_mux = {			\
+		.is_supported = i,	\
+		.offset = o,		\
+		.shift = s,		\
+	},				\
+}
+
+/*
+ * List of pins in Cygnus
+ */
+static struct cygnus_pin cygnus_pins[] = {
+	CYGNUS_PIN_DESC(0, "ext_device_reset_n", 0, 0, 0),
+	CYGNUS_PIN_DESC(1, "chip_mode0", 0, 0, 0),
+	CYGNUS_PIN_DESC(2, "chip_mode1", 0, 0, 0),
+	CYGNUS_PIN_DESC(3, "chip_mode2", 0, 0, 0),
+	CYGNUS_PIN_DESC(4, "chip_mode3", 0, 0, 0),
+	CYGNUS_PIN_DESC(5, "chip_mode4", 0, 0, 0),
+	CYGNUS_PIN_DESC(6, "bsc0_scl", 0, 0, 0),
+	CYGNUS_PIN_DESC(7, "bsc0_sda", 0, 0, 0),
+	CYGNUS_PIN_DESC(8, "bsc1_scl", 0, 0, 0),
+	CYGNUS_PIN_DESC(9, "bsc1_sda", 0, 0, 0),
+	CYGNUS_PIN_DESC(10, "d1w_dq", 1, 0x28, 0),
+	CYGNUS_PIN_DESC(11, "d1wowstz_l", 1, 0x4, 28),
+	CYGNUS_PIN_DESC(12, "gpio0", 0, 0, 0),
+	CYGNUS_PIN_DESC(13, "gpio1", 0, 0, 0),
+	CYGNUS_PIN_DESC(14, "gpio2", 0, 0, 0),
+	CYGNUS_PIN_DESC(15, "gpio3", 0, 0, 0),
+	CYGNUS_PIN_DESC(16, "gpio4", 0, 0, 0),
+	CYGNUS_PIN_DESC(17, "gpio5", 0, 0, 0),
+	CYGNUS_PIN_DESC(18, "gpio6", 0, 0, 0),
+	CYGNUS_PIN_DESC(19, "gpio7", 0, 0, 0),
+	CYGNUS_PIN_DESC(20, "gpio8", 0, 0, 0),
+	CYGNUS_PIN_DESC(21, "gpio9", 0, 0, 0),
+	CYGNUS_PIN_DESC(22, "gpio10", 0, 0, 0),
+	CYGNUS_PIN_DESC(23, "gpio11", 0, 0, 0),
+	CYGNUS_PIN_DESC(24, "gpio12", 0, 0, 0),
+	CYGNUS_PIN_DESC(25, "gpio13", 0, 0, 0),
+	CYGNUS_PIN_DESC(26, "gpio14", 0, 0, 0),
+	CYGNUS_PIN_DESC(27, "gpio15", 0, 0, 0),
+	CYGNUS_PIN_DESC(28, "gpio16", 0, 0, 0),
+	CYGNUS_PIN_DESC(29, "gpio17", 0, 0, 0),
+	CYGNUS_PIN_DESC(30, "gpio18", 0, 0, 0),
+	CYGNUS_PIN_DESC(31, "gpio19", 0, 0, 0),
+	CYGNUS_PIN_DESC(32, "gpio20", 0, 0, 0),
+	CYGNUS_PIN_DESC(33, "gpio21", 0, 0, 0),
+	CYGNUS_PIN_DESC(34, "gpio22", 0, 0, 0),
+	CYGNUS_PIN_DESC(35, "gpio23", 0, 0, 0),
+	CYGNUS_PIN_DESC(36, "mdc", 0, 0, 0),
+	CYGNUS_PIN_DESC(37, "mdio", 0, 0, 0),
+	CYGNUS_PIN_DESC(38, "pwm0", 1, 0x10, 30),
+	CYGNUS_PIN_DESC(39, "pwm1", 1, 0x10, 28),
+	CYGNUS_PIN_DESC(40, "pwm2", 1, 0x10, 26),
+	CYGNUS_PIN_DESC(41, "pwm3", 1, 0x10, 24),
+	CYGNUS_PIN_DESC(42, "sc0_clk", 1, 0x10, 22),
+	CYGNUS_PIN_DESC(43, "sc0_cmdvcc_l", 1, 0x10, 20),
+	CYGNUS_PIN_DESC(44, "sc0_detect", 1, 0x10, 18),
+	CYGNUS_PIN_DESC(45, "sc0_fcb", 1, 0x10, 16),
+	CYGNUS_PIN_DESC(46, "sc0_io", 1, 0x10, 14),
+	CYGNUS_PIN_DESC(47, "sc0_rst_l", 1, 0x10, 12),
+	CYGNUS_PIN_DESC(48, "sc1_clk", 1, 0x10, 10),
+	CYGNUS_PIN_DESC(49, "sc1_cmdvcc_l", 1, 0x10, 8),
+	CYGNUS_PIN_DESC(50, "sc1_detect", 1, 0x10, 6),
+	CYGNUS_PIN_DESC(51, "sc1_fcb", 1, 0x10, 4),
+	CYGNUS_PIN_DESC(52, "sc1_io", 1, 0x10, 2),
+	CYGNUS_PIN_DESC(53, "sc1_rst_l", 1, 0x10, 0),
+	CYGNUS_PIN_DESC(54, "spi0_clk", 1, 0x18, 10),
+	CYGNUS_PIN_DESC(55, "spi0_mosi", 1, 0x18, 6),
+	CYGNUS_PIN_DESC(56, "spi0_miso", 1, 0x18, 8),
+	CYGNUS_PIN_DESC(57, "spi0_ss", 1, 0x18, 4),
+	CYGNUS_PIN_DESC(58, "spi1_clk", 1, 0x18, 2),
+	CYGNUS_PIN_DESC(59, "spi1_mosi", 1, 0x1c, 30),
+	CYGNUS_PIN_DESC(60, "spi1_miso", 1, 0x18, 0),
+	CYGNUS_PIN_DESC(61, "spi1_ss", 1, 0x1c, 28),
+	CYGNUS_PIN_DESC(62, "spi2_clk", 1, 0x1c, 26),
+	CYGNUS_PIN_DESC(63, "spi2_mosi", 1, 0x1c, 22),
+	CYGNUS_PIN_DESC(64, "spi2_miso", 1, 0x1c, 24),
+	CYGNUS_PIN_DESC(65, "spi2_ss", 1, 0x1c, 20),
+	CYGNUS_PIN_DESC(66, "spi3_clk", 1, 0x1c, 18),
+	CYGNUS_PIN_DESC(67, "spi3_mosi", 1, 0x1c, 14),
+	CYGNUS_PIN_DESC(68, "spi3_miso", 1, 0x1c, 16),
+	CYGNUS_PIN_DESC(69, "spi3_ss", 1, 0x1c, 12),
+	CYGNUS_PIN_DESC(70, "uart0_cts", 1, 0x1c, 10),
+	CYGNUS_PIN_DESC(71, "uart0_rts", 1, 0x1c, 8),
+	CYGNUS_PIN_DESC(72, "uart0_rx", 1, 0x1c, 6),
+	CYGNUS_PIN_DESC(73, "uart0_tx", 1, 0x1c, 4),
+	CYGNUS_PIN_DESC(74, "uart1_cts", 1, 0x1c, 2),
+	CYGNUS_PIN_DESC(75, "uart1_dcd", 1, 0x1c, 0),
+	CYGNUS_PIN_DESC(76, "uart1_dsr", 1, 0x20, 14),
+	CYGNUS_PIN_DESC(77, "uart1_dtr", 1, 0x20, 12),
+	CYGNUS_PIN_DESC(78, "uart1_ri", 1, 0x20, 10),
+	CYGNUS_PIN_DESC(79, "uart1_rts", 1, 0x20, 8),
+	CYGNUS_PIN_DESC(80, "uart1_rx", 1, 0x20, 6),
+	CYGNUS_PIN_DESC(81, "uart1_tx", 1, 0x20, 4),
+	CYGNUS_PIN_DESC(82, "uart3_rx", 1, 0x20, 2),
+	CYGNUS_PIN_DESC(83, "uart3_tx", 1, 0x20, 0),
+	CYGNUS_PIN_DESC(84, "sdio1_clk_sdcard", 1, 0x14, 6),
+	CYGNUS_PIN_DESC(85, "sdio1_cmd", 1, 0x14, 4),
+	CYGNUS_PIN_DESC(86, "sdio1_data0", 1, 0x14, 2),
+	CYGNUS_PIN_DESC(87, "sdio1_data1", 1, 0x14, 0),
+	CYGNUS_PIN_DESC(88, "sdio1_data2", 1, 0x18, 30),
+	CYGNUS_PIN_DESC(89, "sdio1_data3", 1, 0x18, 28),
+	CYGNUS_PIN_DESC(90, "sdio1_wp_n", 1, 0x18, 24),
+	CYGNUS_PIN_DESC(91, "sdio1_card_rst", 1, 0x14, 10),
+	CYGNUS_PIN_DESC(92, "sdio1_led_on", 1, 0x18, 26),
+	CYGNUS_PIN_DESC(93, "sdio1_cd", 1, 0x14, 8),
+	CYGNUS_PIN_DESC(94, "sdio0_clk_sdcard", 1, 0x14, 26),
+	CYGNUS_PIN_DESC(95, "sdio0_cmd", 1, 0x14, 24),
+	CYGNUS_PIN_DESC(96, "sdio0_data0", 1, 0x14, 22),
+	CYGNUS_PIN_DESC(97, "sdio0_data1", 1, 0x14, 20),
+	CYGNUS_PIN_DESC(98, "sdio0_data2", 1, 0x14, 18),
+	CYGNUS_PIN_DESC(99, "sdio0_data3", 1, 0x14, 16),
+	CYGNUS_PIN_DESC(100, "sdio0_wp_n", 1, 0x14, 12),
+	CYGNUS_PIN_DESC(101, "sdio0_card_rst", 1, 0x14, 30),
+	CYGNUS_PIN_DESC(102, "sdio0_led_on", 1, 0x14, 14),
+	CYGNUS_PIN_DESC(103, "sdio0_cd", 1, 0x14, 28),
+	CYGNUS_PIN_DESC(104, "sflash_clk", 1, 0x18, 22),
+	CYGNUS_PIN_DESC(105, "sflash_cs_l", 1, 0x18, 20),
+	CYGNUS_PIN_DESC(106, "sflash_mosi", 1, 0x18, 14),
+	CYGNUS_PIN_DESC(107, "sflash_miso", 1, 0x18, 16),
+	CYGNUS_PIN_DESC(108, "sflash_wp_n", 1, 0x18, 12),
+	CYGNUS_PIN_DESC(109, "sflash_hold_n", 1, 0x18, 18),
+	CYGNUS_PIN_DESC(110, "nand_ale", 1, 0xc, 30),
+	CYGNUS_PIN_DESC(111, "nand_ce0_l", 1, 0xc, 28),
+	CYGNUS_PIN_DESC(112, "nand_ce1_l", 1, 0xc, 26),
+	CYGNUS_PIN_DESC(113, "nand_cle", 1, 0xc, 24),
+	CYGNUS_PIN_DESC(114, "nand_dq0", 1, 0xc, 22),
+	CYGNUS_PIN_DESC(115, "nand_dq1", 1, 0xc, 20),
+	CYGNUS_PIN_DESC(116, "nand_dq2", 1, 0xc, 18),
+	CYGNUS_PIN_DESC(117, "nand_dq3", 1, 0xc, 16),
+	CYGNUS_PIN_DESC(118, "nand_dq4", 1, 0xc, 14),
+	CYGNUS_PIN_DESC(119, "nand_dq5", 1, 0xc, 12),
+	CYGNUS_PIN_DESC(120, "nand_dq6", 1, 0xc, 10),
+	CYGNUS_PIN_DESC(121, "nand_dq7", 1, 0xc, 8),
+	CYGNUS_PIN_DESC(122, "nand_rb_l", 1, 0xc, 6),
+	CYGNUS_PIN_DESC(123, "nand_re_l", 1, 0xc, 4),
+	CYGNUS_PIN_DESC(124, "nand_we_l", 1, 0xc, 2),
+	CYGNUS_PIN_DESC(125, "nand_wp_l", 1, 0xc, 0),
+	CYGNUS_PIN_DESC(126, "lcd_clac", 1, 0x4, 26),
+	CYGNUS_PIN_DESC(127, "lcd_clcp", 1, 0x4, 24),
+	CYGNUS_PIN_DESC(128, "lcd_cld0", 1, 0x4, 22),
+	CYGNUS_PIN_DESC(129, "lcd_cld1", 1, 0x4, 0),
+	CYGNUS_PIN_DESC(130, "lcd_cld10", 1, 0x4, 20),
+	CYGNUS_PIN_DESC(131, "lcd_cld11", 1, 0x4, 18),
+	CYGNUS_PIN_DESC(132, "lcd_cld12", 1, 0x4, 16),
+	CYGNUS_PIN_DESC(133, "lcd_cld13", 1, 0x4, 14),
+	CYGNUS_PIN_DESC(134, "lcd_cld14", 1, 0x4, 12),
+	CYGNUS_PIN_DESC(135, "lcd_cld15", 1, 0x4, 10),
+	CYGNUS_PIN_DESC(136, "lcd_cld16", 1, 0x4, 8),
+	CYGNUS_PIN_DESC(137, "lcd_cld17", 1, 0x4, 6),
+	CYGNUS_PIN_DESC(138, "lcd_cld18", 1, 0x4, 4),
+	CYGNUS_PIN_DESC(139, "lcd_cld19", 1, 0x4, 2),
+	CYGNUS_PIN_DESC(140, "lcd_cld2", 1, 0x8, 22),
+	CYGNUS_PIN_DESC(141, "lcd_cld20", 1, 0x8, 30),
+	CYGNUS_PIN_DESC(142, "lcd_cld21", 1, 0x8, 28),
+	CYGNUS_PIN_DESC(143, "lcd_cld22", 1, 0x8, 26),
+	CYGNUS_PIN_DESC(144, "lcd_cld23", 1, 0x8, 24),
+	CYGNUS_PIN_DESC(145, "lcd_cld3", 1, 0x8, 20),
+	CYGNUS_PIN_DESC(146, "lcd_cld4", 1, 0x8, 18),
+	CYGNUS_PIN_DESC(147, "lcd_cld5", 1, 0x8, 16),
+	CYGNUS_PIN_DESC(148, "lcd_cld6", 1, 0x8, 14),
+	CYGNUS_PIN_DESC(149, "lcd_cld7", 1, 0x8, 12),
+	CYGNUS_PIN_DESC(150, "lcd_cld8", 1, 0x8, 10),
+	CYGNUS_PIN_DESC(151, "lcd_cld9", 1, 0x8, 8),
+	CYGNUS_PIN_DESC(152, "lcd_clfp", 1, 0x8, 6),
+	CYGNUS_PIN_DESC(153, "lcd_clle", 1, 0x8, 4),
+	CYGNUS_PIN_DESC(154, "lcd_cllp", 1, 0x8, 2),
+	CYGNUS_PIN_DESC(155, "lcd_clpower", 1, 0x8, 0),
+	CYGNUS_PIN_DESC(156, "camera_vsync", 1, 0x4, 30),
+	CYGNUS_PIN_DESC(157, "camera_trigger", 1, 0x0, 0),
+	CYGNUS_PIN_DESC(158, "camera_strobe", 1, 0x0, 2),
+	CYGNUS_PIN_DESC(159, "camera_standby", 1, 0x0, 4),
+	CYGNUS_PIN_DESC(160, "camera_reset_n", 1, 0x0, 6),
+	CYGNUS_PIN_DESC(161, "camera_pixdata9", 1, 0x0, 8),
+	CYGNUS_PIN_DESC(162, "camera_pixdata8", 1, 0x0, 10),
+	CYGNUS_PIN_DESC(163, "camera_pixdata7", 1, 0x0, 12),
+	CYGNUS_PIN_DESC(164, "camera_pixdata6", 1, 0x0, 14),
+	CYGNUS_PIN_DESC(165, "camera_pixdata5", 1, 0x0, 16),
+	CYGNUS_PIN_DESC(166, "camera_pixdata4", 1, 0x0, 18),
+	CYGNUS_PIN_DESC(167, "camera_pixdata3", 1, 0x0, 20),
+	CYGNUS_PIN_DESC(168, "camera_pixdata2", 1, 0x0, 22),
+	CYGNUS_PIN_DESC(169, "camera_pixdata1", 1, 0x0, 24),
+	CYGNUS_PIN_DESC(170, "camera_pixdata0", 1, 0x0, 26),
+	CYGNUS_PIN_DESC(171, "camera_pixclk", 1, 0x0, 28),
+	CYGNUS_PIN_DESC(172, "camera_hsync", 1, 0x0, 30),
+	CYGNUS_PIN_DESC(173, "camera_pll_ref_clk", 0, 0, 0),
+	CYGNUS_PIN_DESC(174, "usb_id_indication", 0, 0, 0),
+	CYGNUS_PIN_DESC(175, "usb_vbus_indication", 0, 0, 0),
+	CYGNUS_PIN_DESC(176, "gpio0_3p3", 0, 0, 0),
+	CYGNUS_PIN_DESC(177, "gpio1_3p3", 0, 0, 0),
+	CYGNUS_PIN_DESC(178, "gpio2_3p3", 0, 0, 0),
+	CYGNUS_PIN_DESC(179, "gpio3_3p3", 0, 0, 0),
+};
+
+/*
+ * List of groups of pins
+ */
+static const unsigned bsc1_pins[] = { 8, 9 };
+static const unsigned pcie_clkreq_pins[] = { 8, 9 };
+
+static const unsigned i2s2_0_pins[] = { 12 };
+static const unsigned i2s2_1_pins[] = { 13 };
+static const unsigned i2s2_2_pins[] = { 14 };
+static const unsigned i2s2_3_pins[] = { 15 };
+static const unsigned i2s2_4_pins[] = { 16 };
+
+static const unsigned pwm4_pins[] = { 17 };
+static const unsigned pwm5_pins[] = { 18 };
+
+static const unsigned key0_pins[] = { 20 };
+static const unsigned key1_pins[] = { 21 };
+static const unsigned key2_pins[] = { 22 };
+static const unsigned key3_pins[] = { 23 };
+static const unsigned key4_pins[] = { 24 };
+static const unsigned key5_pins[] = { 25 };
+
+static const unsigned key6_pins[] = { 26 };
+static const unsigned audio_dte0_pins[] = { 26 };
+
+static const unsigned key7_pins[] = { 27 };
+static const unsigned audio_dte1_pins[] = { 27 };
+
+static const unsigned key8_pins[] = { 28 };
+static const unsigned key9_pins[] = { 29 };
+static const unsigned key10_pins[] = { 30 };
+static const unsigned key11_pins[] = { 31 };
+static const unsigned key12_pins[] = { 32 };
+static const unsigned key13_pins[] = { 33 };
+
+static const unsigned key14_pins[] = { 34 };
+static const unsigned audio_dte2_pins[] = { 34 };
+
+static const unsigned key15_pins[] = { 35 };
+static const unsigned audio_dte3_pins[] = { 35 };
+
+static const unsigned pwm0_pins[] = { 38 };
+static const unsigned pwm1_pins[] = { 39 };
+static const unsigned pwm2_pins[] = { 40 };
+static const unsigned pwm3_pins[] = { 41 };
+
+static const unsigned sdio0_pins[] = { 94, 95, 96, 97, 98, 99 };
+
+static const unsigned smart_card0_pins[] = { 42, 43, 44, 46, 47 };
+static const unsigned i2s0_0_pins[] = { 42, 43, 44, 46 };
+static const unsigned spdif_pins[] = { 47 };
+
+static const unsigned smart_card1_pins[] = { 48, 49, 50, 52, 53 };
+static const unsigned i2s1_0_pins[] = { 48, 49, 50, 52 };
+
+static const unsigned spi0_pins[] = { 54, 55, 56, 57 };
+
+static const unsigned spi1_pins[] = { 58, 59, 60, 61 };
+
+static const unsigned spi2_pins[] = { 62, 63, 64, 65 };
+
+static const unsigned spi3_pins[] = { 66, 67, 68, 69 };
+static const unsigned sw_led0_0_pins[] = { 66, 67, 68, 69 };
+
+static const unsigned d1w_pins[] = { 10, 11 };
+static const unsigned uart4_pins[] = { 10, 11 };
+static const unsigned sw_led2_0_pins[] = { 10, 11 };
+
+static const unsigned lcd_pins[] = { 126, 127, 128, 129, 130, 131, 132, 133,
+	134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147,
+	148, 149, 150, 151, 152, 153, 154, 155 };
+static const unsigned sram_0_pins[] = { 126, 127, 128, 129, 130, 131, 132, 133,
+	134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147,
+	148, 149, 150, 151, 152, 153, 154, 155 };
+static const unsigned spi5_pins[] = { 141, 142, 143, 144 };
+
+static const unsigned uart0_pins[] = { 70, 71, 72, 73 };
+static const unsigned sw_led0_1_pins[] = { 70, 71, 72, 73 };
+
+static const unsigned uart1_dte_pins[] = { 75, 76, 77, 78 };
+static const unsigned uart2_pins[] = { 75, 76, 77, 78 };
+
+static const unsigned uart1_pins[] = { 74, 79, 80, 81 };
+
+static const unsigned uart3_pins[] = { 82, 83 };
+
+static const unsigned qspi_0_pins[] = { 104, 105, 106, 107 };
+
+static const unsigned nand_pins[] = { 110, 111, 112, 113, 114, 115, 116, 117,
+	118, 119, 120, 121, 122, 123, 124, 125 };
+
+static const unsigned sdio0_cd_pins[] = { 103 };
+
+static const unsigned sdio0_mmc_pins[] = { 100, 101, 102 };
+
+static const unsigned sdio1_data_0_pins[] = { 86, 87 };
+static const unsigned can0_pins[] = { 86, 87 };
+static const unsigned spi4_0_pins[] = { 86, 87 };
+
+static const unsigned sdio1_data_1_pins[] = { 88, 89 };
+static const unsigned can1_pins[] = { 88, 89 };
+static const unsigned spi4_1_pins[] = { 88, 89 };
+
+static const unsigned sdio1_cd_pins[] = { 93 };
+
+static const unsigned sdio1_led_pins[] = { 84, 85 };
+static const unsigned sw_led2_1_pins[] = { 84, 85 };
+
+static const unsigned sdio1_mmc_pins[] = { 90, 91, 92 };
+
+static const unsigned cam_led_pins[] = { 156, 157, 158, 159, 160 };
+static const unsigned sw_led1_pins[] = { 156, 157, 158, 159 };
+
+static const unsigned cam_0_pins[] = { 169, 170, 171, 169, 170 };
+
+static const unsigned cam_1_pins[] = { 161, 162, 163, 164, 165, 166, 167,
+	168 };
+static const unsigned sram_1_pins[] = { 161, 162, 163, 164, 165, 166, 167,
+	168 };
+
+static const unsigned qspi_1_pins[] = { 108, 109 };
+
+static const unsigned smart_card0_fcb_pins[] = { 45 };
+static const unsigned i2s0_1_pins[] = { 45 };
+
+static const unsigned smart_card1_fcb_pins[] = { 51 };
+static const unsigned i2s1_1_pins[] = { 51 };
+
+static const unsigned gpio0_3p3_pins[] = { 176 };
+static const unsigned usb0_oc_pins[] = { 176 };
+
+static const unsigned gpio1_3p3_pins[] = { 177 };
+static const unsigned usb1_oc_pins[] = { 177 };
+
+static const unsigned gpio2_3p3_pins[] = { 178 };
+static const unsigned usb2_oc_pins[] = { 178 };
+
+#define CYGNUS_PIN_GROUP(group_name, off, sh, al)	\
+{							\
+	.name = #group_name"""_grp",			\
+	.pins = group_name ## _pins,			\
+	.num_pins = ARRAY_SIZE(group_name ## _pins),	\
+	.mux = {					\
+		.offset = off,				\
+		.shift = sh,				\
+		.alt = al,				\
+	}						\
+}
+
+/*
+ * List of Cygnus pin groups
+ */
+static const struct cygnus_pin_group cygnus_pin_groups[] = {
+	CYGNUS_PIN_GROUP(i2s2_0, 0x0, 0, 2),
+	CYGNUS_PIN_GROUP(i2s2_1, 0x0, 4, 2),
+	CYGNUS_PIN_GROUP(i2s2_2, 0x0, 8, 2),
+	CYGNUS_PIN_GROUP(i2s2_3, 0x0, 12, 2),
+	CYGNUS_PIN_GROUP(i2s2_4, 0x0, 16, 2),
+	CYGNUS_PIN_GROUP(pwm4, 0x0, 20, 0),
+	CYGNUS_PIN_GROUP(pwm5, 0x0, 24, 2),
+	CYGNUS_PIN_GROUP(key0, 0x4, 0, 1),
+	CYGNUS_PIN_GROUP(key1, 0x4, 4, 1),
+	CYGNUS_PIN_GROUP(key2, 0x4, 8, 1),
+	CYGNUS_PIN_GROUP(key3, 0x4, 12, 1),
+	CYGNUS_PIN_GROUP(key4, 0x4, 16, 1),
+	CYGNUS_PIN_GROUP(key5, 0x4, 20, 1),
+	CYGNUS_PIN_GROUP(key6, 0x4, 24, 1),
+	CYGNUS_PIN_GROUP(audio_dte0, 0x4, 24, 2),
+	CYGNUS_PIN_GROUP(key7, 0x4, 28, 1),
+	CYGNUS_PIN_GROUP(audio_dte1, 0x4, 28, 2),
+	CYGNUS_PIN_GROUP(key8, 0x8, 0, 1),
+	CYGNUS_PIN_GROUP(key9, 0x8, 4, 1),
+	CYGNUS_PIN_GROUP(key10, 0x8, 8, 1),
+	CYGNUS_PIN_GROUP(key11, 0x8, 12, 1),
+	CYGNUS_PIN_GROUP(key12, 0x8, 16, 1),
+	CYGNUS_PIN_GROUP(key13, 0x8, 20, 1),
+	CYGNUS_PIN_GROUP(key14, 0x8, 24, 1),
+	CYGNUS_PIN_GROUP(audio_dte2, 0x8, 24, 2),
+	CYGNUS_PIN_GROUP(key15, 0x8, 28, 1),
+	CYGNUS_PIN_GROUP(audio_dte3, 0x8, 28, 2),
+	CYGNUS_PIN_GROUP(pwm0, 0xc, 0, 0),
+	CYGNUS_PIN_GROUP(pwm1, 0xc, 4, 0),
+	CYGNUS_PIN_GROUP(pwm2, 0xc, 8, 0),
+	CYGNUS_PIN_GROUP(pwm3, 0xc, 12, 0),
+	CYGNUS_PIN_GROUP(sdio0, 0xc, 16, 0),
+	CYGNUS_PIN_GROUP(smart_card0, 0xc, 20, 0),
+	CYGNUS_PIN_GROUP(i2s0_0, 0xc, 20, 1),
+	CYGNUS_PIN_GROUP(spdif, 0xc, 20, 1),
+	CYGNUS_PIN_GROUP(smart_card1, 0xc, 24, 0),
+	CYGNUS_PIN_GROUP(i2s1_0, 0xc, 24, 1),
+	CYGNUS_PIN_GROUP(spi0, 0x10, 0, 0),
+	CYGNUS_PIN_GROUP(spi1, 0x10, 4, 0),
+	CYGNUS_PIN_GROUP(spi2, 0x10, 8, 0),
+	CYGNUS_PIN_GROUP(spi3, 0x10, 12, 0),
+	CYGNUS_PIN_GROUP(sw_led0_0, 0x10, 12, 2),
+	CYGNUS_PIN_GROUP(d1w, 0x10, 16, 0),
+	CYGNUS_PIN_GROUP(uart4, 0x10, 16, 1),
+	CYGNUS_PIN_GROUP(sw_led2_0, 0x10, 16, 2),
+	CYGNUS_PIN_GROUP(lcd, 0x10, 20, 0),
+	CYGNUS_PIN_GROUP(sram_0, 0x10, 20, 1),
+	CYGNUS_PIN_GROUP(spi5, 0x10, 20, 2),
+	CYGNUS_PIN_GROUP(uart0, 0x14, 0, 0),
+	CYGNUS_PIN_GROUP(sw_led0_1, 0x14, 0, 2),
+	CYGNUS_PIN_GROUP(uart1_dte, 0x14, 4, 0),
+	CYGNUS_PIN_GROUP(uart2, 0x14, 4, 1),
+	CYGNUS_PIN_GROUP(uart1, 0x14, 8, 0),
+	CYGNUS_PIN_GROUP(uart3, 0x14, 12, 0),
+	CYGNUS_PIN_GROUP(qspi_0, 0x14, 16, 0),
+	CYGNUS_PIN_GROUP(nand, 0x14, 20, 0),
+	CYGNUS_PIN_GROUP(sdio0_cd, 0x18, 0, 0),
+	CYGNUS_PIN_GROUP(sdio0_mmc, 0x18, 4, 0),
+	CYGNUS_PIN_GROUP(sdio1_data_0, 0x18, 8, 0),
+	CYGNUS_PIN_GROUP(can0, 0x18, 8, 1),
+	CYGNUS_PIN_GROUP(spi4_0, 0x18, 8, 2),
+	CYGNUS_PIN_GROUP(sdio1_data_1, 0x18, 12, 0),
+	CYGNUS_PIN_GROUP(can1, 0x18, 12, 1),
+	CYGNUS_PIN_GROUP(spi4_1, 0x18, 12, 2),
+	CYGNUS_PIN_GROUP(sdio1_cd, 0x18, 16, 0),
+	CYGNUS_PIN_GROUP(sdio1_led, 0x18, 20, 0),
+	CYGNUS_PIN_GROUP(sw_led2_1, 0x18, 20, 2),
+	CYGNUS_PIN_GROUP(sdio1_mmc, 0x18, 24, 0),
+	CYGNUS_PIN_GROUP(cam_led, 0x1c, 0, 0),
+	CYGNUS_PIN_GROUP(sw_led1, 0x1c, 0, 1),
+	CYGNUS_PIN_GROUP(cam_0, 0x1c, 4, 0),
+	CYGNUS_PIN_GROUP(cam_1, 0x1c, 8, 0),
+	CYGNUS_PIN_GROUP(sram_1, 0x1c, 8, 1),
+	CYGNUS_PIN_GROUP(qspi_1, 0x1c, 12, 0),
+	CYGNUS_PIN_GROUP(bsc1, 0x1c, 16, 0),
+	CYGNUS_PIN_GROUP(pcie_clkreq, 0x1c, 16, 1),
+	CYGNUS_PIN_GROUP(smart_card0_fcb, 0x20, 0, 0),
+	CYGNUS_PIN_GROUP(i2s0_1, 0x20, 0, 1),
+	CYGNUS_PIN_GROUP(smart_card1_fcb, 0x20, 4, 0),
+	CYGNUS_PIN_GROUP(i2s1_1, 0x20, 4, 1),
+	CYGNUS_PIN_GROUP(gpio0_3p3, 0x28, 0, 0),
+	CYGNUS_PIN_GROUP(usb0_oc, 0x28, 0, 1),
+	CYGNUS_PIN_GROUP(gpio1_3p3, 0x28, 4, 0),
+	CYGNUS_PIN_GROUP(usb1_oc, 0x28, 4, 1),
+	CYGNUS_PIN_GROUP(gpio2_3p3, 0x28, 8, 0),
+	CYGNUS_PIN_GROUP(usb2_oc, 0x28, 8, 1),
+};
+
+/*
+ * List of groups supported by functions
+ */
+static const char * const i2s0_grps[] = { "i2s0_0_grp", "i2s0_1_grp" };
+static const char * const i2s1_grps[] = { "i2s1_0_grp", "i2s1_1_grp" };
+static const char * const i2s2_grps[] = { "i2s2_0_grp", "i2s2_1_grp",
+	"i2s2_2_grp", "i2s2_3_grp", "i2s2_4_grp" };
+static const char * const spdif_grps[] = { "spdif_grp" };
+static const char * const pwm0_grps[] = { "pwm0_grp" };
+static const char * const pwm1_grps[] = { "pwm1_grp" };
+static const char * const pwm2_grps[] = { "pwm2_grp" };
+static const char * const pwm3_grps[] = { "pwm3_grp" };
+static const char * const pwm4_grps[] = { "pwm4_grp" };
+static const char * const pwm5_grps[] = { "pwm5_grp" };
+static const char * const key_grps[] = { "key0_grp", "key1_grp", "key2_grp",
+	"key3_grp", "key4_grp", "key5_grp", "key6_grp", "key7_grp", "key8_grp",
+	"key9_grp", "key10_grp", "key11_grp", "key12_grp", "key13_grp",
+	"key14_grp", "key15_grp" };
+static const char * const audio_dte_grps[] = { "audio_dte0_grp",
+	"audio_dte1_grp", "audio_dte2_grp", "audio_dte3_grp" };
+static const char * const smart_card0_grps[] = { "smart_card0_grp",
+	"smart_card0_fcb_grp" };
+static const char * const smart_card1_grps[] = { "smart_card1_grp",
+	"smart_card1_fcb_grp" };
+static const char * const spi0_grps[] = { "spi0_grp" };
+static const char * const spi1_grps[] = { "spi1_grp" };
+static const char * const spi2_grps[] = { "spi2_grp" };
+static const char * const spi3_grps[] = { "spi3_grp" };
+static const char * const spi4_grps[] = { "spi4_0_grp", "spi4_1_grp" };
+static const char * const spi5_grps[] = { "spi5_grp" };
+
+static const char * const sw_led0_grps[] = { "sw_led0_0_grp",
+	"sw_led0_1_grp" };
+static const char * const sw_led1_grps[] = { "sw_led1_grp" };
+static const char * const sw_led2_grps[] = { "sw_led2_0_grp",
+	"sw_led2_1_grp" };
+static const char * const d1w_grps[] = { "d1w_grp" };
+static const char * const lcd_grps[] = { "lcd_grp" };
+static const char * const sram_grps[] = { "sram_0_grp", "sram_1_grp" };
+
+static const char * const uart0_grps[] = { "uart0_grp" };
+static const char * const uart1_grps[] = { "uart1_grp", "uart1_dte_grp" };
+static const char * const uart2_grps[] = { "uart2_grp" };
+static const char * const uart3_grps[] = { "uart3_grp" };
+static const char * const uart4_grps[] = { "uart4_grp" };
+static const char * const qspi_grps[] = { "qspi_0_grp", "qspi_1_grp" };
+static const char * const nand_grps[] = { "nand_grp" };
+static const char * const sdio0_grps[] = { "sdio0_grp", "sdio0_cd_grp",
+	"sdio0_mmc_grp" };
+static const char * const sdio1_grps[] = { "sdio1_data_0_grp",
+	"sdio1_data_1_grp", "sdio1_cd_grp", "sdio1_led_grp", "sdio1_mmc_grp" };
+static const char * const can0_grps[] = { "can0_grp" };
+static const char * const can1_grps[] = { "can1_grp" };
+static const char * const cam_grps[] = { "cam_led_grp", "cam_0_grp",
+	"cam_1_grp" };
+static const char * const bsc1_grps[] = { "bsc1_grp" };
+static const char * const pcie_clkreq_grps[] = { "pcie_clkreq_grp" };
+static const char * const usb0_oc_grps[] = { "usb0_oc_grp" };
+static const char * const usb1_oc_grps[] = { "usb1_oc_grp" };
+static const char * const usb2_oc_grps[] = { "usb2_oc_grp" };
+
+#define CYGNUS_PIN_FUNCTION(func)				\
+{								\
+	.name = #func,						\
+	.groups = func ## _grps,				\
+	.num_groups = ARRAY_SIZE(func ## _grps),		\
+}
+
+/*
+ * List of supported functions in Cygnus
+ */
+static const struct cygnus_pin_function cygnus_pin_functions[] = {
+	CYGNUS_PIN_FUNCTION(i2s0),
+	CYGNUS_PIN_FUNCTION(i2s1),
+	CYGNUS_PIN_FUNCTION(i2s2),
+	CYGNUS_PIN_FUNCTION(spdif),
+	CYGNUS_PIN_FUNCTION(pwm0),
+	CYGNUS_PIN_FUNCTION(pwm1),
+	CYGNUS_PIN_FUNCTION(pwm2),
+	CYGNUS_PIN_FUNCTION(pwm3),
+	CYGNUS_PIN_FUNCTION(pwm4),
+	CYGNUS_PIN_FUNCTION(pwm5),
+	CYGNUS_PIN_FUNCTION(key),
+	CYGNUS_PIN_FUNCTION(audio_dte),
+	CYGNUS_PIN_FUNCTION(smart_card0),
+	CYGNUS_PIN_FUNCTION(smart_card1),
+	CYGNUS_PIN_FUNCTION(spi0),
+	CYGNUS_PIN_FUNCTION(spi1),
+	CYGNUS_PIN_FUNCTION(spi2),
+	CYGNUS_PIN_FUNCTION(spi3),
+	CYGNUS_PIN_FUNCTION(spi4),
+	CYGNUS_PIN_FUNCTION(spi5),
+	CYGNUS_PIN_FUNCTION(sw_led0),
+	CYGNUS_PIN_FUNCTION(sw_led1),
+	CYGNUS_PIN_FUNCTION(sw_led2),
+	CYGNUS_PIN_FUNCTION(d1w),
+	CYGNUS_PIN_FUNCTION(lcd),
+	CYGNUS_PIN_FUNCTION(sram),
+	CYGNUS_PIN_FUNCTION(uart0),
+	CYGNUS_PIN_FUNCTION(uart1),
+	CYGNUS_PIN_FUNCTION(uart2),
+	CYGNUS_PIN_FUNCTION(uart3),
+	CYGNUS_PIN_FUNCTION(uart4),
+	CYGNUS_PIN_FUNCTION(qspi),
+	CYGNUS_PIN_FUNCTION(nand),
+	CYGNUS_PIN_FUNCTION(sdio0),
+	CYGNUS_PIN_FUNCTION(sdio1),
+	CYGNUS_PIN_FUNCTION(can0),
+	CYGNUS_PIN_FUNCTION(can1),
+	CYGNUS_PIN_FUNCTION(cam),
+	CYGNUS_PIN_FUNCTION(bsc1),
+	CYGNUS_PIN_FUNCTION(pcie_clkreq),
+	CYGNUS_PIN_FUNCTION(usb0_oc),
+	CYGNUS_PIN_FUNCTION(usb1_oc),
+	CYGNUS_PIN_FUNCTION(usb2_oc),
+};
+
+static int cygnus_get_groups_count(struct pinctrl_dev *pctrl_dev)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->num_groups;
+}
+
+static const char *cygnus_get_group_name(struct pinctrl_dev *pctrl_dev,
+					 unsigned selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->groups[selector].name;
+}
+
+static int cygnus_get_group_pins(struct pinctrl_dev *pctrl_dev,
+				 unsigned selector, const unsigned **pins,
+				 unsigned *num_pins)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	*pins = pinctrl->groups[selector].pins;
+	*num_pins = pinctrl->groups[selector].num_pins;
+
+	return 0;
+}
+
+static void cygnus_pin_dbg_show(struct pinctrl_dev *pctrl_dev,
+				struct seq_file *s, unsigned offset)
+{
+	seq_printf(s, " %s", dev_name(pctrl_dev->dev));
+}
+
+static bool cygnus_function_is_valid(const char *function_name)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(cygnus_pin_functions); i++) {
+		if (!strcmp(cygnus_pin_functions[i].name, function_name))
+			return true;
+	}
+
+	return false;
+}
+
+/*
+ * TODO: Use API from pinctrl framework once "groups" parsing is supported
+ */
+static int cygnus_dt_node_to_map(struct pinctrl_dev *pctrl_dev,
+				 struct device_node *np,
+				 struct pinctrl_map **map,
+				 unsigned *num_maps)
+{
+	int ret, num_groups;
+	unsigned reserved_maps = 0;
+	struct property *prop;
+	const char *group_name, *function_name;
+
+	*map = NULL;
+	*num_maps = 0;
+
+	num_groups = of_property_count_strings(np, "groups");
+	if (num_groups < 0) {
+		dev_err(pctrl_dev->dev, "could not parse property groups\n");
+		return -EINVAL;
+	}
+
+	ret = of_property_read_string(np, "function", &function_name);
+	if (ret < 0) {
+		dev_err(pctrl_dev->dev,	"could not parse property function\n");
+		return -EINVAL;
+	}
+
+	/* check if it's a valid function */
+	if (!cygnus_function_is_valid(function_name)) {
+		dev_warn(pctrl_dev->dev, "invalid function name: %s\n",
+				function_name);
+	}
+
+	ret = pinctrl_utils_reserve_map(pctrl_dev, map, &reserved_maps,
+			num_maps, num_groups);
+	if (ret) {
+		dev_err(pctrl_dev->dev, "unable to reserve map\n");
+		return ret;
+	}
+
+	of_property_for_each_string(np, "groups", prop, group_name) {
+		ret = pinctrl_utils_add_map_mux(pctrl_dev, map,
+				&reserved_maps, num_maps, group_name,
+				function_name);
+		if (ret) {
+			dev_err(pctrl_dev->dev, "can't add map: %d\n", ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static struct pinctrl_ops cygnus_pinctrl_ops = {
+	.get_groups_count = cygnus_get_groups_count,
+	.get_group_name = cygnus_get_group_name,
+	.get_group_pins = cygnus_get_group_pins,
+	.pin_dbg_show = cygnus_pin_dbg_show,
+	.dt_node_to_map = cygnus_dt_node_to_map,
+	.dt_free_map = pinctrl_utils_dt_free_map,
+};
+
+static int cygnus_get_functions_count(struct pinctrl_dev *pctrl_dev)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->num_functions;
+}
+
+static const char *cygnus_get_function_name(struct pinctrl_dev *pctrl_dev,
+					    unsigned selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->functions[selector].name;
+}
+
+static int cygnus_get_function_groups(struct pinctrl_dev *pctrl_dev,
+				      unsigned selector,
+				      const char * const **groups,
+				      unsigned * const num_groups)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	*groups = pinctrl->functions[selector].groups;
+	*num_groups = pinctrl->functions[selector].num_groups;
+
+	return 0;
+}
+
+static int cygnus_pinmux_set(struct cygnus_pinctrl *pinctrl,
+			     const struct cygnus_pin_function *func,
+			     const struct cygnus_pin_group *grp,
+			     struct cygnus_mux_log *mux_log)
+{
+	const struct cygnus_mux *mux = &grp->mux;
+	int i;
+	u32 val, mask = 0x7;
+	unsigned long flags;
+
+	for (i = 0; i < CYGNUS_NUM_IOMUX; i++) {
+		if (mux->offset != mux_log[i].mux.offset ||
+		    mux->shift != mux_log[i].mux.shift)
+			continue;
+
+		/* match found if we reach here */
+
+		/* if this is a new configuration, just do it! */
+		if (!mux_log[i].is_configured)
+			break;
+
+		/*
+		 * IOMUX has been configured previously and one is trying to
+		 * configure it to a different function
+		 */
+		if (mux_log[i].mux.alt != mux->alt) {
+			dev_err(pinctrl->dev,
+				"double configuration error detected!\n");
+			dev_err(pinctrl->dev, "func:%s grp:%s\n",
+				func->name, grp->name);
+			return -EINVAL;
+		} else {
+			/*
+			 * One tries to configure it to the same function.
+			 * Just quit and don't bother
+			 */
+			return 0;
+		}
+	}
+
+	mux_log[i].mux.alt = mux->alt;
+	mux_log[i].is_configured = true;
+
+	spin_lock_irqsave(&pinctrl->lock, flags);
+
+	val = readl(pinctrl->base0 + grp->mux.offset);
+	val &= ~(mask << grp->mux.shift);
+	val |= grp->mux.alt << grp->mux.shift;
+	writel(val, pinctrl->base0 + grp->mux.offset);
+
+	spin_unlock_irqrestore(&pinctrl->lock, flags);
+
+	return 0;
+}
+
+static int cygnus_pinmux_set_mux(struct pinctrl_dev *pctrl_dev,
+				 unsigned func_select, unsigned grp_select)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+	const struct cygnus_pin_function *func =
+		&pinctrl->functions[func_select];
+	const struct cygnus_pin_group *grp = &pinctrl->groups[grp_select];
+
+	dev_dbg(pctrl_dev->dev, "func:%u name:%s grp:%u name:%s\n",
+		func_select, func->name, grp_select, grp->name);
+
+	dev_dbg(pctrl_dev->dev, "offset:0x%08x shift:%u alt:%u\n",
+		grp->mux.offset, grp->mux.shift, grp->mux.alt);
+
+	return cygnus_pinmux_set(pinctrl, func, grp, pinctrl->mux_log);
+}
+
+static int cygnus_gpio_request_enable(struct pinctrl_dev *pctrl_dev,
+				      struct pinctrl_gpio_range *range,
+				      unsigned pin)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+	struct cygnus_gpio_mux *mux = pctrl_dev->desc->pins[pin].drv_data;
+	u32 val;
+	unsigned long flags;
+
+	/* not all pins support GPIO pinmux override */
+	if (!mux->is_supported)
+		return -ENOTSUPP;
+
+	spin_lock_irqsave(&pinctrl->lock, flags);
+
+	val = readl(pinctrl->base1 + mux->offset);
+	val |= 0x3 << mux->shift;
+	writel(val, pinctrl->base1 + mux->offset);
+
+	spin_unlock_irqrestore(&pinctrl->lock, flags);
+
+	dev_dbg(pctrl_dev->dev,
+		"gpio request enable pin=%u offset=0x%x shift=%u\n",
+		pin, mux->offset, mux->shift);
+
+	return 0;
+}
+
+static void cygnus_gpio_disable_free(struct pinctrl_dev *pctrl_dev,
+				     struct pinctrl_gpio_range *range,
+				     unsigned pin)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+	struct cygnus_gpio_mux *mux = pctrl_dev->desc->pins[pin].drv_data;
+	u32 val;
+	unsigned long flags;
+
+	if (!mux->is_supported)
+		return;
+
+	spin_lock_irqsave(&pinctrl->lock, flags);
+
+	val = readl(pinctrl->base1 + mux->offset);
+	val &= ~(0x3 << mux->shift);
+	writel(val, pinctrl->base1 + mux->offset);
+
+	spin_unlock_irqrestore(&pinctrl->lock, flags);
+
+	dev_err(pctrl_dev->dev,
+		"gpio disable free pin=%u offset=0x%x shift=%u\n",
+		pin, mux->offset, mux->shift);
+}
+
+static struct pinmux_ops cygnus_pinmux_ops = {
+	.get_functions_count = cygnus_get_functions_count,
+	.get_function_name = cygnus_get_function_name,
+	.get_function_groups = cygnus_get_function_groups,
+	.set_mux = cygnus_pinmux_set_mux,
+	.gpio_request_enable = cygnus_gpio_request_enable,
+	.gpio_disable_free = cygnus_gpio_disable_free,
+};
+
+static struct pinctrl_desc cygnus_pinctrl_desc = {
+	.name = "cygnus-pinmux",
+	.pctlops = &cygnus_pinctrl_ops,
+	.pmxops = &cygnus_pinmux_ops,
+};
+
+static int cygnus_mux_log_init(struct cygnus_pinctrl *pinctrl)
+{
+	struct cygnus_mux_log *log;
+	unsigned int i, j;
+
+	pinctrl->mux_log = devm_kcalloc(pinctrl->dev, CYGNUS_NUM_IOMUX,
+					sizeof(struct cygnus_mux_log),
+					GFP_KERNEL);
+	if (!pinctrl->mux_log)
+		return -ENOMEM;
+
+	log = pinctrl->mux_log;
+	for (i = 0; i < CYGNUS_NUM_IOMUX_REGS; i++) {
+		for (j = 0; j < CYGNUS_NUM_MUX_PER_REG; j++) {
+			log = &pinctrl->mux_log[i * CYGNUS_NUM_MUX_PER_REG
+				+ j];
+			log->mux.offset = i * 4;
+			log->mux.shift = j * 4;
+			log->mux.alt = 0;
+			log->is_configured = false;
+		}
+	}
+
+	return 0;
+}
+
+static int cygnus_pinmux_probe(struct platform_device *pdev)
+{
+	struct cygnus_pinctrl *pinctrl;
+	struct resource *res;
+	int i, ret;
+	struct pinctrl_pin_desc *pins;
+	unsigned num_pins = ARRAY_SIZE(cygnus_pins);
+
+	pinctrl = devm_kzalloc(&pdev->dev, sizeof(*pinctrl), GFP_KERNEL);
+	if (!pinctrl)
+		return -ENOMEM;
+
+	pinctrl->dev = &pdev->dev;
+	platform_set_drvdata(pdev, pinctrl);
+	spin_lock_init(&pinctrl->lock);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	pinctrl->base0 = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(pinctrl->base0)) {
+		dev_err(&pdev->dev, "unable to map I/O space\n");
+		return PTR_ERR(pinctrl->base0);
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	pinctrl->base1 = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(pinctrl->base1)) {
+		dev_err(&pdev->dev, "unable to map I/O space\n");
+		return PTR_ERR(pinctrl->base1);
+	}
+
+	ret = cygnus_mux_log_init(pinctrl);
+	if (ret) {
+		dev_err(&pdev->dev, "unable to initialize IOMUX log\n");
+		return ret;
+	}
+
+	pins = devm_kcalloc(&pdev->dev, num_pins, sizeof(*pins), GFP_KERNEL);
+	if (!pins)
+		return -ENOMEM;
+
+	for (i = 0; i < num_pins; i++) {
+		pins[i].number = cygnus_pins[i].pin;
+		pins[i].name = cygnus_pins[i].name;
+		pins[i].drv_data = &cygnus_pins[i].gpio_mux;
+	}
+
+	pinctrl->groups = cygnus_pin_groups;
+	pinctrl->num_groups = ARRAY_SIZE(cygnus_pin_groups);
+	pinctrl->functions = cygnus_pin_functions;
+	pinctrl->num_functions = ARRAY_SIZE(cygnus_pin_functions);
+	cygnus_pinctrl_desc.pins = pins;
+	cygnus_pinctrl_desc.npins = num_pins;
+
+	pinctrl->pctl = pinctrl_register(&cygnus_pinctrl_desc, &pdev->dev,
+			pinctrl);
+	if (!pinctrl->pctl) {
+		dev_err(&pdev->dev, "unable to register Cygnus IOMUX pinctrl\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static struct of_device_id cygnus_pinmux_of_match[] = {
+	{ .compatible = "brcm,cygnus-pinmux" },
+	{ }
+};
+
+static struct platform_driver cygnus_pinmux_driver = {
+	.driver = {
+		.name = "cygnus-pinmux",
+		.of_match_table = cygnus_pinmux_of_match,
+	},
+	.probe = cygnus_pinmux_probe,
+};
+
+static int __init cygnus_pinmux_init(void)
+{
+	return platform_driver_register(&cygnus_pinmux_driver);
+}
+arch_initcall(cygnus_pinmux_init);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus IOMUX driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v3 3/4] pinctrl: cygnus: add initial IOMUX driver support

[Ray Jui]

This adds the initial driver support for the Broadcom Cygnus IOMUX
controller. The Cygnus IOMUX controller supports group based mux
configuration but allows certain pins to be muxed to GPIO individually

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/pinctrl/bcm/Kconfig              |   13 +
 drivers/pinctrl/bcm/Makefile             |    5 +-
 drivers/pinctrl/bcm/pinctrl-cygnus-mux.c | 1087 ++++++++++++++++++++++++++++++
 3 files changed, 1103 insertions(+), 2 deletions(-)
 create mode 100644 drivers/pinctrl/bcm/pinctrl-cygnus-mux.c

diff --git a/drivers/pinctrl/bcm/Kconfig b/drivers/pinctrl/bcm/Kconfig
index bc6d048..eb13201 100644
--- a/drivers/pinctrl/bcm/Kconfig
+++ b/drivers/pinctrl/bcm/Kconfig
@@ -19,3 +19,16 @@ config PINCTRL_BCM2835
 	bool
 	select PINMUX
 	select PINCONF
+
+config PINCTRL_CYGNUS_MUX
+	bool "Broadcom Cygnus IOMUX driver"
+	depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
+	select PINMUX
+	select GENERIC_PINCONF
+	default ARCH_BCM_CYGNUS
+	help
+	  Say yes here to enable the Broadcom Cygnus IOMUX driver.
+
+	  The Broadcom Cygnus IOMUX driver supports group based IOMUX
+	  configuration, with the exception that certain individual pins
+	  can be overrided to GPIO function
diff --git a/drivers/pinctrl/bcm/Makefile b/drivers/pinctrl/bcm/Makefile
index 7ba80a3..bb6beb6 100644
--- a/drivers/pinctrl/bcm/Makefile
+++ b/drivers/pinctrl/bcm/Makefile
@@ -1,4 +1,5 @@
 # Broadcom pinctrl support
 
-obj-$(CONFIG_PINCTRL_BCM281XX)	+= pinctrl-bcm281xx.o
-obj-$(CONFIG_PINCTRL_BCM2835)	+= pinctrl-bcm2835.o
+obj-$(CONFIG_PINCTRL_BCM281XX)		+= pinctrl-bcm281xx.o
+obj-$(CONFIG_PINCTRL_BCM2835)		+= pinctrl-bcm2835.o
+obj-$(CONFIG_PINCTRL_CYGNUS_MUX)	+= pinctrl-cygnus-mux.o
diff --git a/drivers/pinctrl/bcm/pinctrl-cygnus-mux.c b/drivers/pinctrl/bcm/pinctrl-cygnus-mux.c
new file mode 100644
index 0000000..33565b4
--- /dev/null
+++ b/drivers/pinctrl/bcm/pinctrl-cygnus-mux.c
@@ -0,0 +1,1087 @@
+/* Copyright (C) 2014-2015 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * This file contains the Cygnus IOMUX driver that supports group based PINMUX
+ * configuration. Although PINMUX configuration is mainly group based, the
+ * Cygnus IOMUX controller allows certain pins to be individually muxed to GPIO
+ * function, and therefore be controlled by the Cygnus ASIU GPIO controller
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include "../core.h"
+#include "../pinctrl-utils.h"
+
+#define CYGNUS_NUM_IOMUX_REGS     8
+#define CYGNUS_NUM_MUX_PER_REG    8
+#define CYGNUS_NUM_IOMUX          (CYGNUS_NUM_IOMUX_REGS * \
+				   CYGNUS_NUM_MUX_PER_REG)
+
+/*
+ * Cygnus IOMUX register description
+ *
+ * @offset: register offset for mux configuration of a group
+ * @shift: bit shift for mux configuration of a group
+ * @alt: alternate function to set to
+ */
+struct cygnus_mux {
+	unsigned int offset;
+	unsigned int shift;
+	unsigned int alt;
+};
+
+/*
+ * Keep track of Cygnus IOMUX configuration and prevent double configuration
+ *
+ * @cygnus_mux: Cygnus IOMUX register description
+ * @is_configured: flag to indicate whether a mux setting has already been
+ * configured
+ */
+struct cygnus_mux_log {
+	struct cygnus_mux mux;
+	bool is_configured;
+};
+
+/*
+ * Group based IOMUX configuration
+ *
+ * @name: name of the group
+ * @pins: array of pins used by this group
+ * @num_pins: total number of pins used by this group
+ * @mux: Cygnus group based IOMUX configuration
+ */
+struct cygnus_pin_group {
+	const char *name;
+	const unsigned *pins;
+	const unsigned num_pins;
+	const struct cygnus_mux mux;
+};
+
+/*
+ * Cygnus mux function and supported pin groups
+ *
+ * @name: name of the function
+ * @groups: array of groups that can be supported by this function
+ * @num_groups: total number of groups that can be supported by this function
+ */
+struct cygnus_pin_function {
+	const char *name;
+	const char * const *groups;
+	const unsigned num_groups;
+};
+
+/*
+ * Cygnus IOMUX pinctrl core
+ *
+ * @pctl: pointer to pinctrl_dev
+ * @dev: pointer to device
+ * @base0: first I/O register base of the Cygnus IOMUX controller
+ * @base1: second I/O register base
+ * @groups: pointer to array of groups
+ * @num_groups: total number of groups
+ * @functions: pointer to array of functions
+ * @num_functions: total number of functions
+ * @mux_log: pointer to the array of mux logs
+ * @lock: lock to protect register access
+ */
+struct cygnus_pinctrl {
+	struct pinctrl_dev *pctl;
+	struct device *dev;
+	void __iomem *base0;
+	void __iomem *base1;
+
+	const struct cygnus_pin_group *groups;
+	unsigned num_groups;
+
+	const struct cygnus_pin_function *functions;
+	unsigned num_functions;
+
+	struct cygnus_mux_log *mux_log;
+
+	spinlock_t lock;
+};
+
+/*
+ * Certain pins can be individually muxed to GPIO function
+ *
+ * @is_supported: flag to indicate GPIO mux is supported for this pin
+ * @offset: register offset for GPIO mux override of a pin
+ * @shift: bit shift for GPIO mux override of a pin
+ */
+struct cygnus_gpio_mux {
+	int is_supported;
+	unsigned int offset;
+	unsigned int shift;
+};
+
+/*
+ * Description of a pin in Cygnus
+ *
+ * @pin: pin number
+ * @name: pin name
+ * @gpio_mux: GPIO override related information
+ */
+struct cygnus_pin {
+	unsigned pin;
+	char *name;
+	struct cygnus_gpio_mux gpio_mux;
+};
+
+#define CYGNUS_PIN_DESC(p, n, i, o, s)	\
+{					\
+	.pin = p,			\
+	.name = n,			\
+	.gpio_mux = {			\
+		.is_supported = i,	\
+		.offset = o,		\
+		.shift = s,		\
+	},				\
+}
+
+/*
+ * List of pins in Cygnus
+ */
+static struct cygnus_pin cygnus_pins[] = {
+	CYGNUS_PIN_DESC(0, "ext_device_reset_n", 0, 0, 0),
+	CYGNUS_PIN_DESC(1, "chip_mode0", 0, 0, 0),
+	CYGNUS_PIN_DESC(2, "chip_mode1", 0, 0, 0),
+	CYGNUS_PIN_DESC(3, "chip_mode2", 0, 0, 0),
+	CYGNUS_PIN_DESC(4, "chip_mode3", 0, 0, 0),
+	CYGNUS_PIN_DESC(5, "chip_mode4", 0, 0, 0),
+	CYGNUS_PIN_DESC(6, "bsc0_scl", 0, 0, 0),
+	CYGNUS_PIN_DESC(7, "bsc0_sda", 0, 0, 0),
+	CYGNUS_PIN_DESC(8, "bsc1_scl", 0, 0, 0),
+	CYGNUS_PIN_DESC(9, "bsc1_sda", 0, 0, 0),
+	CYGNUS_PIN_DESC(10, "d1w_dq", 1, 0x28, 0),
+	CYGNUS_PIN_DESC(11, "d1wowstz_l", 1, 0x4, 28),
+	CYGNUS_PIN_DESC(12, "gpio0", 0, 0, 0),
+	CYGNUS_PIN_DESC(13, "gpio1", 0, 0, 0),
+	CYGNUS_PIN_DESC(14, "gpio2", 0, 0, 0),
+	CYGNUS_PIN_DESC(15, "gpio3", 0, 0, 0),
+	CYGNUS_PIN_DESC(16, "gpio4", 0, 0, 0),
+	CYGNUS_PIN_DESC(17, "gpio5", 0, 0, 0),
+	CYGNUS_PIN_DESC(18, "gpio6", 0, 0, 0),
+	CYGNUS_PIN_DESC(19, "gpio7", 0, 0, 0),
+	CYGNUS_PIN_DESC(20, "gpio8", 0, 0, 0),
+	CYGNUS_PIN_DESC(21, "gpio9", 0, 0, 0),
+	CYGNUS_PIN_DESC(22, "gpio10", 0, 0, 0),
+	CYGNUS_PIN_DESC(23, "gpio11", 0, 0, 0),
+	CYGNUS_PIN_DESC(24, "gpio12", 0, 0, 0),
+	CYGNUS_PIN_DESC(25, "gpio13", 0, 0, 0),
+	CYGNUS_PIN_DESC(26, "gpio14", 0, 0, 0),
+	CYGNUS_PIN_DESC(27, "gpio15", 0, 0, 0),
+	CYGNUS_PIN_DESC(28, "gpio16", 0, 0, 0),
+	CYGNUS_PIN_DESC(29, "gpio17", 0, 0, 0),
+	CYGNUS_PIN_DESC(30, "gpio18", 0, 0, 0),
+	CYGNUS_PIN_DESC(31, "gpio19", 0, 0, 0),
+	CYGNUS_PIN_DESC(32, "gpio20", 0, 0, 0),
+	CYGNUS_PIN_DESC(33, "gpio21", 0, 0, 0),
+	CYGNUS_PIN_DESC(34, "gpio22", 0, 0, 0),
+	CYGNUS_PIN_DESC(35, "gpio23", 0, 0, 0),
+	CYGNUS_PIN_DESC(36, "mdc", 0, 0, 0),
+	CYGNUS_PIN_DESC(37, "mdio", 0, 0, 0),
+	CYGNUS_PIN_DESC(38, "pwm0", 1, 0x10, 30),
+	CYGNUS_PIN_DESC(39, "pwm1", 1, 0x10, 28),
+	CYGNUS_PIN_DESC(40, "pwm2", 1, 0x10, 26),
+	CYGNUS_PIN_DESC(41, "pwm3", 1, 0x10, 24),
+	CYGNUS_PIN_DESC(42, "sc0_clk", 1, 0x10, 22),
+	CYGNUS_PIN_DESC(43, "sc0_cmdvcc_l", 1, 0x10, 20),
+	CYGNUS_PIN_DESC(44, "sc0_detect", 1, 0x10, 18),
+	CYGNUS_PIN_DESC(45, "sc0_fcb", 1, 0x10, 16),
+	CYGNUS_PIN_DESC(46, "sc0_io", 1, 0x10, 14),
+	CYGNUS_PIN_DESC(47, "sc0_rst_l", 1, 0x10, 12),
+	CYGNUS_PIN_DESC(48, "sc1_clk", 1, 0x10, 10),
+	CYGNUS_PIN_DESC(49, "sc1_cmdvcc_l", 1, 0x10, 8),
+	CYGNUS_PIN_DESC(50, "sc1_detect", 1, 0x10, 6),
+	CYGNUS_PIN_DESC(51, "sc1_fcb", 1, 0x10, 4),
+	CYGNUS_PIN_DESC(52, "sc1_io", 1, 0x10, 2),
+	CYGNUS_PIN_DESC(53, "sc1_rst_l", 1, 0x10, 0),
+	CYGNUS_PIN_DESC(54, "spi0_clk", 1, 0x18, 10),
+	CYGNUS_PIN_DESC(55, "spi0_mosi", 1, 0x18, 6),
+	CYGNUS_PIN_DESC(56, "spi0_miso", 1, 0x18, 8),
+	CYGNUS_PIN_DESC(57, "spi0_ss", 1, 0x18, 4),
+	CYGNUS_PIN_DESC(58, "spi1_clk", 1, 0x18, 2),
+	CYGNUS_PIN_DESC(59, "spi1_mosi", 1, 0x1c, 30),
+	CYGNUS_PIN_DESC(60, "spi1_miso", 1, 0x18, 0),
+	CYGNUS_PIN_DESC(61, "spi1_ss", 1, 0x1c, 28),
+	CYGNUS_PIN_DESC(62, "spi2_clk", 1, 0x1c, 26),
+	CYGNUS_PIN_DESC(63, "spi2_mosi", 1, 0x1c, 22),
+	CYGNUS_PIN_DESC(64, "spi2_miso", 1, 0x1c, 24),
+	CYGNUS_PIN_DESC(65, "spi2_ss", 1, 0x1c, 20),
+	CYGNUS_PIN_DESC(66, "spi3_clk", 1, 0x1c, 18),
+	CYGNUS_PIN_DESC(67, "spi3_mosi", 1, 0x1c, 14),
+	CYGNUS_PIN_DESC(68, "spi3_miso", 1, 0x1c, 16),
+	CYGNUS_PIN_DESC(69, "spi3_ss", 1, 0x1c, 12),
+	CYGNUS_PIN_DESC(70, "uart0_cts", 1, 0x1c, 10),
+	CYGNUS_PIN_DESC(71, "uart0_rts", 1, 0x1c, 8),
+	CYGNUS_PIN_DESC(72, "uart0_rx", 1, 0x1c, 6),
+	CYGNUS_PIN_DESC(73, "uart0_tx", 1, 0x1c, 4),
+	CYGNUS_PIN_DESC(74, "uart1_cts", 1, 0x1c, 2),
+	CYGNUS_PIN_DESC(75, "uart1_dcd", 1, 0x1c, 0),
+	CYGNUS_PIN_DESC(76, "uart1_dsr", 1, 0x20, 14),
+	CYGNUS_PIN_DESC(77, "uart1_dtr", 1, 0x20, 12),
+	CYGNUS_PIN_DESC(78, "uart1_ri", 1, 0x20, 10),
+	CYGNUS_PIN_DESC(79, "uart1_rts", 1, 0x20, 8),
+	CYGNUS_PIN_DESC(80, "uart1_rx", 1, 0x20, 6),
+	CYGNUS_PIN_DESC(81, "uart1_tx", 1, 0x20, 4),
+	CYGNUS_PIN_DESC(82, "uart3_rx", 1, 0x20, 2),
+	CYGNUS_PIN_DESC(83, "uart3_tx", 1, 0x20, 0),
+	CYGNUS_PIN_DESC(84, "sdio1_clk_sdcard", 1, 0x14, 6),
+	CYGNUS_PIN_DESC(85, "sdio1_cmd", 1, 0x14, 4),
+	CYGNUS_PIN_DESC(86, "sdio1_data0", 1, 0x14, 2),
+	CYGNUS_PIN_DESC(87, "sdio1_data1", 1, 0x14, 0),
+	CYGNUS_PIN_DESC(88, "sdio1_data2", 1, 0x18, 30),
+	CYGNUS_PIN_DESC(89, "sdio1_data3", 1, 0x18, 28),
+	CYGNUS_PIN_DESC(90, "sdio1_wp_n", 1, 0x18, 24),
+	CYGNUS_PIN_DESC(91, "sdio1_card_rst", 1, 0x14, 10),
+	CYGNUS_PIN_DESC(92, "sdio1_led_on", 1, 0x18, 26),
+	CYGNUS_PIN_DESC(93, "sdio1_cd", 1, 0x14, 8),
+	CYGNUS_PIN_DESC(94, "sdio0_clk_sdcard", 1, 0x14, 26),
+	CYGNUS_PIN_DESC(95, "sdio0_cmd", 1, 0x14, 24),
+	CYGNUS_PIN_DESC(96, "sdio0_data0", 1, 0x14, 22),
+	CYGNUS_PIN_DESC(97, "sdio0_data1", 1, 0x14, 20),
+	CYGNUS_PIN_DESC(98, "sdio0_data2", 1, 0x14, 18),
+	CYGNUS_PIN_DESC(99, "sdio0_data3", 1, 0x14, 16),
+	CYGNUS_PIN_DESC(100, "sdio0_wp_n", 1, 0x14, 12),
+	CYGNUS_PIN_DESC(101, "sdio0_card_rst", 1, 0x14, 30),
+	CYGNUS_PIN_DESC(102, "sdio0_led_on", 1, 0x14, 14),
+	CYGNUS_PIN_DESC(103, "sdio0_cd", 1, 0x14, 28),
+	CYGNUS_PIN_DESC(104, "sflash_clk", 1, 0x18, 22),
+	CYGNUS_PIN_DESC(105, "sflash_cs_l", 1, 0x18, 20),
+	CYGNUS_PIN_DESC(106, "sflash_mosi", 1, 0x18, 14),
+	CYGNUS_PIN_DESC(107, "sflash_miso", 1, 0x18, 16),
+	CYGNUS_PIN_DESC(108, "sflash_wp_n", 1, 0x18, 12),
+	CYGNUS_PIN_DESC(109, "sflash_hold_n", 1, 0x18, 18),
+	CYGNUS_PIN_DESC(110, "nand_ale", 1, 0xc, 30),
+	CYGNUS_PIN_DESC(111, "nand_ce0_l", 1, 0xc, 28),
+	CYGNUS_PIN_DESC(112, "nand_ce1_l", 1, 0xc, 26),
+	CYGNUS_PIN_DESC(113, "nand_cle", 1, 0xc, 24),
+	CYGNUS_PIN_DESC(114, "nand_dq0", 1, 0xc, 22),
+	CYGNUS_PIN_DESC(115, "nand_dq1", 1, 0xc, 20),
+	CYGNUS_PIN_DESC(116, "nand_dq2", 1, 0xc, 18),
+	CYGNUS_PIN_DESC(117, "nand_dq3", 1, 0xc, 16),
+	CYGNUS_PIN_DESC(118, "nand_dq4", 1, 0xc, 14),
+	CYGNUS_PIN_DESC(119, "nand_dq5", 1, 0xc, 12),
+	CYGNUS_PIN_DESC(120, "nand_dq6", 1, 0xc, 10),
+	CYGNUS_PIN_DESC(121, "nand_dq7", 1, 0xc, 8),
+	CYGNUS_PIN_DESC(122, "nand_rb_l", 1, 0xc, 6),
+	CYGNUS_PIN_DESC(123, "nand_re_l", 1, 0xc, 4),
+	CYGNUS_PIN_DESC(124, "nand_we_l", 1, 0xc, 2),
+	CYGNUS_PIN_DESC(125, "nand_wp_l", 1, 0xc, 0),
+	CYGNUS_PIN_DESC(126, "lcd_clac", 1, 0x4, 26),
+	CYGNUS_PIN_DESC(127, "lcd_clcp", 1, 0x4, 24),
+	CYGNUS_PIN_DESC(128, "lcd_cld0", 1, 0x4, 22),
+	CYGNUS_PIN_DESC(129, "lcd_cld1", 1, 0x4, 0),
+	CYGNUS_PIN_DESC(130, "lcd_cld10", 1, 0x4, 20),
+	CYGNUS_PIN_DESC(131, "lcd_cld11", 1, 0x4, 18),
+	CYGNUS_PIN_DESC(132, "lcd_cld12", 1, 0x4, 16),
+	CYGNUS_PIN_DESC(133, "lcd_cld13", 1, 0x4, 14),
+	CYGNUS_PIN_DESC(134, "lcd_cld14", 1, 0x4, 12),
+	CYGNUS_PIN_DESC(135, "lcd_cld15", 1, 0x4, 10),
+	CYGNUS_PIN_DESC(136, "lcd_cld16", 1, 0x4, 8),
+	CYGNUS_PIN_DESC(137, "lcd_cld17", 1, 0x4, 6),
+	CYGNUS_PIN_DESC(138, "lcd_cld18", 1, 0x4, 4),
+	CYGNUS_PIN_DESC(139, "lcd_cld19", 1, 0x4, 2),
+	CYGNUS_PIN_DESC(140, "lcd_cld2", 1, 0x8, 22),
+	CYGNUS_PIN_DESC(141, "lcd_cld20", 1, 0x8, 30),
+	CYGNUS_PIN_DESC(142, "lcd_cld21", 1, 0x8, 28),
+	CYGNUS_PIN_DESC(143, "lcd_cld22", 1, 0x8, 26),
+	CYGNUS_PIN_DESC(144, "lcd_cld23", 1, 0x8, 24),
+	CYGNUS_PIN_DESC(145, "lcd_cld3", 1, 0x8, 20),
+	CYGNUS_PIN_DESC(146, "lcd_cld4", 1, 0x8, 18),
+	CYGNUS_PIN_DESC(147, "lcd_cld5", 1, 0x8, 16),
+	CYGNUS_PIN_DESC(148, "lcd_cld6", 1, 0x8, 14),
+	CYGNUS_PIN_DESC(149, "lcd_cld7", 1, 0x8, 12),
+	CYGNUS_PIN_DESC(150, "lcd_cld8", 1, 0x8, 10),
+	CYGNUS_PIN_DESC(151, "lcd_cld9", 1, 0x8, 8),
+	CYGNUS_PIN_DESC(152, "lcd_clfp", 1, 0x8, 6),
+	CYGNUS_PIN_DESC(153, "lcd_clle", 1, 0x8, 4),
+	CYGNUS_PIN_DESC(154, "lcd_cllp", 1, 0x8, 2),
+	CYGNUS_PIN_DESC(155, "lcd_clpower", 1, 0x8, 0),
+	CYGNUS_PIN_DESC(156, "camera_vsync", 1, 0x4, 30),
+	CYGNUS_PIN_DESC(157, "camera_trigger", 1, 0x0, 0),
+	CYGNUS_PIN_DESC(158, "camera_strobe", 1, 0x0, 2),
+	CYGNUS_PIN_DESC(159, "camera_standby", 1, 0x0, 4),
+	CYGNUS_PIN_DESC(160, "camera_reset_n", 1, 0x0, 6),
+	CYGNUS_PIN_DESC(161, "camera_pixdata9", 1, 0x0, 8),
+	CYGNUS_PIN_DESC(162, "camera_pixdata8", 1, 0x0, 10),
+	CYGNUS_PIN_DESC(163, "camera_pixdata7", 1, 0x0, 12),
+	CYGNUS_PIN_DESC(164, "camera_pixdata6", 1, 0x0, 14),
+	CYGNUS_PIN_DESC(165, "camera_pixdata5", 1, 0x0, 16),
+	CYGNUS_PIN_DESC(166, "camera_pixdata4", 1, 0x0, 18),
+	CYGNUS_PIN_DESC(167, "camera_pixdata3", 1, 0x0, 20),
+	CYGNUS_PIN_DESC(168, "camera_pixdata2", 1, 0x0, 22),
+	CYGNUS_PIN_DESC(169, "camera_pixdata1", 1, 0x0, 24),
+	CYGNUS_PIN_DESC(170, "camera_pixdata0", 1, 0x0, 26),
+	CYGNUS_PIN_DESC(171, "camera_pixclk", 1, 0x0, 28),
+	CYGNUS_PIN_DESC(172, "camera_hsync", 1, 0x0, 30),
+	CYGNUS_PIN_DESC(173, "camera_pll_ref_clk", 0, 0, 0),
+	CYGNUS_PIN_DESC(174, "usb_id_indication", 0, 0, 0),
+	CYGNUS_PIN_DESC(175, "usb_vbus_indication", 0, 0, 0),
+	CYGNUS_PIN_DESC(176, "gpio0_3p3", 0, 0, 0),
+	CYGNUS_PIN_DESC(177, "gpio1_3p3", 0, 0, 0),
+	CYGNUS_PIN_DESC(178, "gpio2_3p3", 0, 0, 0),
+	CYGNUS_PIN_DESC(179, "gpio3_3p3", 0, 0, 0),
+};
+
+/*
+ * List of groups of pins
+ */
+static const unsigned bsc1_pins[] = { 8, 9 };
+static const unsigned pcie_clkreq_pins[] = { 8, 9 };
+
+static const unsigned i2s2_0_pins[] = { 12 };
+static const unsigned i2s2_1_pins[] = { 13 };
+static const unsigned i2s2_2_pins[] = { 14 };
+static const unsigned i2s2_3_pins[] = { 15 };
+static const unsigned i2s2_4_pins[] = { 16 };
+
+static const unsigned pwm4_pins[] = { 17 };
+static const unsigned pwm5_pins[] = { 18 };
+
+static const unsigned key0_pins[] = { 20 };
+static const unsigned key1_pins[] = { 21 };
+static const unsigned key2_pins[] = { 22 };
+static const unsigned key3_pins[] = { 23 };
+static const unsigned key4_pins[] = { 24 };
+static const unsigned key5_pins[] = { 25 };
+
+static const unsigned key6_pins[] = { 26 };
+static const unsigned audio_dte0_pins[] = { 26 };
+
+static const unsigned key7_pins[] = { 27 };
+static const unsigned audio_dte1_pins[] = { 27 };
+
+static const unsigned key8_pins[] = { 28 };
+static const unsigned key9_pins[] = { 29 };
+static const unsigned key10_pins[] = { 30 };
+static const unsigned key11_pins[] = { 31 };
+static const unsigned key12_pins[] = { 32 };
+static const unsigned key13_pins[] = { 33 };
+
+static const unsigned key14_pins[] = { 34 };
+static const unsigned audio_dte2_pins[] = { 34 };
+
+static const unsigned key15_pins[] = { 35 };
+static const unsigned audio_dte3_pins[] = { 35 };
+
+static const unsigned pwm0_pins[] = { 38 };
+static const unsigned pwm1_pins[] = { 39 };
+static const unsigned pwm2_pins[] = { 40 };
+static const unsigned pwm3_pins[] = { 41 };
+
+static const unsigned sdio0_pins[] = { 94, 95, 96, 97, 98, 99 };
+
+static const unsigned smart_card0_pins[] = { 42, 43, 44, 46, 47 };
+static const unsigned i2s0_0_pins[] = { 42, 43, 44, 46 };
+static const unsigned spdif_pins[] = { 47 };
+
+static const unsigned smart_card1_pins[] = { 48, 49, 50, 52, 53 };
+static const unsigned i2s1_0_pins[] = { 48, 49, 50, 52 };
+
+static const unsigned spi0_pins[] = { 54, 55, 56, 57 };
+
+static const unsigned spi1_pins[] = { 58, 59, 60, 61 };
+
+static const unsigned spi2_pins[] = { 62, 63, 64, 65 };
+
+static const unsigned spi3_pins[] = { 66, 67, 68, 69 };
+static const unsigned sw_led0_0_pins[] = { 66, 67, 68, 69 };
+
+static const unsigned d1w_pins[] = { 10, 11 };
+static const unsigned uart4_pins[] = { 10, 11 };
+static const unsigned sw_led2_0_pins[] = { 10, 11 };
+
+static const unsigned lcd_pins[] = { 126, 127, 128, 129, 130, 131, 132, 133,
+	134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147,
+	148, 149, 150, 151, 152, 153, 154, 155 };
+static const unsigned sram_0_pins[] = { 126, 127, 128, 129, 130, 131, 132, 133,
+	134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147,
+	148, 149, 150, 151, 152, 153, 154, 155 };
+static const unsigned spi5_pins[] = { 141, 142, 143, 144 };
+
+static const unsigned uart0_pins[] = { 70, 71, 72, 73 };
+static const unsigned sw_led0_1_pins[] = { 70, 71, 72, 73 };
+
+static const unsigned uart1_dte_pins[] = { 75, 76, 77, 78 };
+static const unsigned uart2_pins[] = { 75, 76, 77, 78 };
+
+static const unsigned uart1_pins[] = { 74, 79, 80, 81 };
+
+static const unsigned uart3_pins[] = { 82, 83 };
+
+static const unsigned qspi_0_pins[] = { 104, 105, 106, 107 };
+
+static const unsigned nand_pins[] = { 110, 111, 112, 113, 114, 115, 116, 117,
+	118, 119, 120, 121, 122, 123, 124, 125 };
+
+static const unsigned sdio0_cd_pins[] = { 103 };
+
+static const unsigned sdio0_mmc_pins[] = { 100, 101, 102 };
+
+static const unsigned sdio1_data_0_pins[] = { 86, 87 };
+static const unsigned can0_pins[] = { 86, 87 };
+static const unsigned spi4_0_pins[] = { 86, 87 };
+
+static const unsigned sdio1_data_1_pins[] = { 88, 89 };
+static const unsigned can1_pins[] = { 88, 89 };
+static const unsigned spi4_1_pins[] = { 88, 89 };
+
+static const unsigned sdio1_cd_pins[] = { 93 };
+
+static const unsigned sdio1_led_pins[] = { 84, 85 };
+static const unsigned sw_led2_1_pins[] = { 84, 85 };
+
+static const unsigned sdio1_mmc_pins[] = { 90, 91, 92 };
+
+static const unsigned cam_led_pins[] = { 156, 157, 158, 159, 160 };
+static const unsigned sw_led1_pins[] = { 156, 157, 158, 159 };
+
+static const unsigned cam_0_pins[] = { 169, 170, 171, 169, 170 };
+
+static const unsigned cam_1_pins[] = { 161, 162, 163, 164, 165, 166, 167,
+	168 };
+static const unsigned sram_1_pins[] = { 161, 162, 163, 164, 165, 166, 167,
+	168 };
+
+static const unsigned qspi_1_pins[] = { 108, 109 };
+
+static const unsigned smart_card0_fcb_pins[] = { 45 };
+static const unsigned i2s0_1_pins[] = { 45 };
+
+static const unsigned smart_card1_fcb_pins[] = { 51 };
+static const unsigned i2s1_1_pins[] = { 51 };
+
+static const unsigned gpio0_3p3_pins[] = { 176 };
+static const unsigned usb0_oc_pins[] = { 176 };
+
+static const unsigned gpio1_3p3_pins[] = { 177 };
+static const unsigned usb1_oc_pins[] = { 177 };
+
+static const unsigned gpio2_3p3_pins[] = { 178 };
+static const unsigned usb2_oc_pins[] = { 178 };
+
+#define CYGNUS_PIN_GROUP(group_name, off, sh, al)	\
+{							\
+	.name = #group_name"""_grp",			\
+	.pins = group_name ## _pins,			\
+	.num_pins = ARRAY_SIZE(group_name ## _pins),	\
+	.mux = {					\
+		.offset = off,				\
+		.shift = sh,				\
+		.alt = al,				\
+	}						\
+}
+
+/*
+ * List of Cygnus pin groups
+ */
+static const struct cygnus_pin_group cygnus_pin_groups[] = {
+	CYGNUS_PIN_GROUP(i2s2_0, 0x0, 0, 2),
+	CYGNUS_PIN_GROUP(i2s2_1, 0x0, 4, 2),
+	CYGNUS_PIN_GROUP(i2s2_2, 0x0, 8, 2),
+	CYGNUS_PIN_GROUP(i2s2_3, 0x0, 12, 2),
+	CYGNUS_PIN_GROUP(i2s2_4, 0x0, 16, 2),
+	CYGNUS_PIN_GROUP(pwm4, 0x0, 20, 0),
+	CYGNUS_PIN_GROUP(pwm5, 0x0, 24, 2),
+	CYGNUS_PIN_GROUP(key0, 0x4, 0, 1),
+	CYGNUS_PIN_GROUP(key1, 0x4, 4, 1),
+	CYGNUS_PIN_GROUP(key2, 0x4, 8, 1),
+	CYGNUS_PIN_GROUP(key3, 0x4, 12, 1),
+	CYGNUS_PIN_GROUP(key4, 0x4, 16, 1),
+	CYGNUS_PIN_GROUP(key5, 0x4, 20, 1),
+	CYGNUS_PIN_GROUP(key6, 0x4, 24, 1),
+	CYGNUS_PIN_GROUP(audio_dte0, 0x4, 24, 2),
+	CYGNUS_PIN_GROUP(key7, 0x4, 28, 1),
+	CYGNUS_PIN_GROUP(audio_dte1, 0x4, 28, 2),
+	CYGNUS_PIN_GROUP(key8, 0x8, 0, 1),
+	CYGNUS_PIN_GROUP(key9, 0x8, 4, 1),
+	CYGNUS_PIN_GROUP(key10, 0x8, 8, 1),
+	CYGNUS_PIN_GROUP(key11, 0x8, 12, 1),
+	CYGNUS_PIN_GROUP(key12, 0x8, 16, 1),
+	CYGNUS_PIN_GROUP(key13, 0x8, 20, 1),
+	CYGNUS_PIN_GROUP(key14, 0x8, 24, 1),
+	CYGNUS_PIN_GROUP(audio_dte2, 0x8, 24, 2),
+	CYGNUS_PIN_GROUP(key15, 0x8, 28, 1),
+	CYGNUS_PIN_GROUP(audio_dte3, 0x8, 28, 2),
+	CYGNUS_PIN_GROUP(pwm0, 0xc, 0, 0),
+	CYGNUS_PIN_GROUP(pwm1, 0xc, 4, 0),
+	CYGNUS_PIN_GROUP(pwm2, 0xc, 8, 0),
+	CYGNUS_PIN_GROUP(pwm3, 0xc, 12, 0),
+	CYGNUS_PIN_GROUP(sdio0, 0xc, 16, 0),
+	CYGNUS_PIN_GROUP(smart_card0, 0xc, 20, 0),
+	CYGNUS_PIN_GROUP(i2s0_0, 0xc, 20, 1),
+	CYGNUS_PIN_GROUP(spdif, 0xc, 20, 1),
+	CYGNUS_PIN_GROUP(smart_card1, 0xc, 24, 0),
+	CYGNUS_PIN_GROUP(i2s1_0, 0xc, 24, 1),
+	CYGNUS_PIN_GROUP(spi0, 0x10, 0, 0),
+	CYGNUS_PIN_GROUP(spi1, 0x10, 4, 0),
+	CYGNUS_PIN_GROUP(spi2, 0x10, 8, 0),
+	CYGNUS_PIN_GROUP(spi3, 0x10, 12, 0),
+	CYGNUS_PIN_GROUP(sw_led0_0, 0x10, 12, 2),
+	CYGNUS_PIN_GROUP(d1w, 0x10, 16, 0),
+	CYGNUS_PIN_GROUP(uart4, 0x10, 16, 1),
+	CYGNUS_PIN_GROUP(sw_led2_0, 0x10, 16, 2),
+	CYGNUS_PIN_GROUP(lcd, 0x10, 20, 0),
+	CYGNUS_PIN_GROUP(sram_0, 0x10, 20, 1),
+	CYGNUS_PIN_GROUP(spi5, 0x10, 20, 2),
+	CYGNUS_PIN_GROUP(uart0, 0x14, 0, 0),
+	CYGNUS_PIN_GROUP(sw_led0_1, 0x14, 0, 2),
+	CYGNUS_PIN_GROUP(uart1_dte, 0x14, 4, 0),
+	CYGNUS_PIN_GROUP(uart2, 0x14, 4, 1),
+	CYGNUS_PIN_GROUP(uart1, 0x14, 8, 0),
+	CYGNUS_PIN_GROUP(uart3, 0x14, 12, 0),
+	CYGNUS_PIN_GROUP(qspi_0, 0x14, 16, 0),
+	CYGNUS_PIN_GROUP(nand, 0x14, 20, 0),
+	CYGNUS_PIN_GROUP(sdio0_cd, 0x18, 0, 0),
+	CYGNUS_PIN_GROUP(sdio0_mmc, 0x18, 4, 0),
+	CYGNUS_PIN_GROUP(sdio1_data_0, 0x18, 8, 0),
+	CYGNUS_PIN_GROUP(can0, 0x18, 8, 1),
+	CYGNUS_PIN_GROUP(spi4_0, 0x18, 8, 2),
+	CYGNUS_PIN_GROUP(sdio1_data_1, 0x18, 12, 0),
+	CYGNUS_PIN_GROUP(can1, 0x18, 12, 1),
+	CYGNUS_PIN_GROUP(spi4_1, 0x18, 12, 2),
+	CYGNUS_PIN_GROUP(sdio1_cd, 0x18, 16, 0),
+	CYGNUS_PIN_GROUP(sdio1_led, 0x18, 20, 0),
+	CYGNUS_PIN_GROUP(sw_led2_1, 0x18, 20, 2),
+	CYGNUS_PIN_GROUP(sdio1_mmc, 0x18, 24, 0),
+	CYGNUS_PIN_GROUP(cam_led, 0x1c, 0, 0),
+	CYGNUS_PIN_GROUP(sw_led1, 0x1c, 0, 1),
+	CYGNUS_PIN_GROUP(cam_0, 0x1c, 4, 0),
+	CYGNUS_PIN_GROUP(cam_1, 0x1c, 8, 0),
+	CYGNUS_PIN_GROUP(sram_1, 0x1c, 8, 1),
+	CYGNUS_PIN_GROUP(qspi_1, 0x1c, 12, 0),
+	CYGNUS_PIN_GROUP(bsc1, 0x1c, 16, 0),
+	CYGNUS_PIN_GROUP(pcie_clkreq, 0x1c, 16, 1),
+	CYGNUS_PIN_GROUP(smart_card0_fcb, 0x20, 0, 0),
+	CYGNUS_PIN_GROUP(i2s0_1, 0x20, 0, 1),
+	CYGNUS_PIN_GROUP(smart_card1_fcb, 0x20, 4, 0),
+	CYGNUS_PIN_GROUP(i2s1_1, 0x20, 4, 1),
+	CYGNUS_PIN_GROUP(gpio0_3p3, 0x28, 0, 0),
+	CYGNUS_PIN_GROUP(usb0_oc, 0x28, 0, 1),
+	CYGNUS_PIN_GROUP(gpio1_3p3, 0x28, 4, 0),
+	CYGNUS_PIN_GROUP(usb1_oc, 0x28, 4, 1),
+	CYGNUS_PIN_GROUP(gpio2_3p3, 0x28, 8, 0),
+	CYGNUS_PIN_GROUP(usb2_oc, 0x28, 8, 1),
+};
+
+/*
+ * List of groups supported by functions
+ */
+static const char * const i2s0_grps[] = { "i2s0_0_grp", "i2s0_1_grp" };
+static const char * const i2s1_grps[] = { "i2s1_0_grp", "i2s1_1_grp" };
+static const char * const i2s2_grps[] = { "i2s2_0_grp", "i2s2_1_grp",
+	"i2s2_2_grp", "i2s2_3_grp", "i2s2_4_grp" };
+static const char * const spdif_grps[] = { "spdif_grp" };
+static const char * const pwm0_grps[] = { "pwm0_grp" };
+static const char * const pwm1_grps[] = { "pwm1_grp" };
+static const char * const pwm2_grps[] = { "pwm2_grp" };
+static const char * const pwm3_grps[] = { "pwm3_grp" };
+static const char * const pwm4_grps[] = { "pwm4_grp" };
+static const char * const pwm5_grps[] = { "pwm5_grp" };
+static const char * const key_grps[] = { "key0_grp", "key1_grp", "key2_grp",
+	"key3_grp", "key4_grp", "key5_grp", "key6_grp", "key7_grp", "key8_grp",
+	"key9_grp", "key10_grp", "key11_grp", "key12_grp", "key13_grp",
+	"key14_grp", "key15_grp" };
+static const char * const audio_dte_grps[] = { "audio_dte0_grp",
+	"audio_dte1_grp", "audio_dte2_grp", "audio_dte3_grp" };
+static const char * const smart_card0_grps[] = { "smart_card0_grp",
+	"smart_card0_fcb_grp" };
+static const char * const smart_card1_grps[] = { "smart_card1_grp",
+	"smart_card1_fcb_grp" };
+static const char * const spi0_grps[] = { "spi0_grp" };
+static const char * const spi1_grps[] = { "spi1_grp" };
+static const char * const spi2_grps[] = { "spi2_grp" };
+static const char * const spi3_grps[] = { "spi3_grp" };
+static const char * const spi4_grps[] = { "spi4_0_grp", "spi4_1_grp" };
+static const char * const spi5_grps[] = { "spi5_grp" };
+
+static const char * const sw_led0_grps[] = { "sw_led0_0_grp",
+	"sw_led0_1_grp" };
+static const char * const sw_led1_grps[] = { "sw_led1_grp" };
+static const char * const sw_led2_grps[] = { "sw_led2_0_grp",
+	"sw_led2_1_grp" };
+static const char * const d1w_grps[] = { "d1w_grp" };
+static const char * const lcd_grps[] = { "lcd_grp" };
+static const char * const sram_grps[] = { "sram_0_grp", "sram_1_grp" };
+
+static const char * const uart0_grps[] = { "uart0_grp" };
+static const char * const uart1_grps[] = { "uart1_grp", "uart1_dte_grp" };
+static const char * const uart2_grps[] = { "uart2_grp" };
+static const char * const uart3_grps[] = { "uart3_grp" };
+static const char * const uart4_grps[] = { "uart4_grp" };
+static const char * const qspi_grps[] = { "qspi_0_grp", "qspi_1_grp" };
+static const char * const nand_grps[] = { "nand_grp" };
+static const char * const sdio0_grps[] = { "sdio0_grp", "sdio0_cd_grp",
+	"sdio0_mmc_grp" };
+static const char * const sdio1_grps[] = { "sdio1_data_0_grp",
+	"sdio1_data_1_grp", "sdio1_cd_grp", "sdio1_led_grp", "sdio1_mmc_grp" };
+static const char * const can0_grps[] = { "can0_grp" };
+static const char * const can1_grps[] = { "can1_grp" };
+static const char * const cam_grps[] = { "cam_led_grp", "cam_0_grp",
+	"cam_1_grp" };
+static const char * const bsc1_grps[] = { "bsc1_grp" };
+static const char * const pcie_clkreq_grps[] = { "pcie_clkreq_grp" };
+static const char * const usb0_oc_grps[] = { "usb0_oc_grp" };
+static const char * const usb1_oc_grps[] = { "usb1_oc_grp" };
+static const char * const usb2_oc_grps[] = { "usb2_oc_grp" };
+
+#define CYGNUS_PIN_FUNCTION(func)				\
+{								\
+	.name = #func,						\
+	.groups = func ## _grps,				\
+	.num_groups = ARRAY_SIZE(func ## _grps),		\
+}
+
+/*
+ * List of supported functions in Cygnus
+ */
+static const struct cygnus_pin_function cygnus_pin_functions[] = {
+	CYGNUS_PIN_FUNCTION(i2s0),
+	CYGNUS_PIN_FUNCTION(i2s1),
+	CYGNUS_PIN_FUNCTION(i2s2),
+	CYGNUS_PIN_FUNCTION(spdif),
+	CYGNUS_PIN_FUNCTION(pwm0),
+	CYGNUS_PIN_FUNCTION(pwm1),
+	CYGNUS_PIN_FUNCTION(pwm2),
+	CYGNUS_PIN_FUNCTION(pwm3),
+	CYGNUS_PIN_FUNCTION(pwm4),
+	CYGNUS_PIN_FUNCTION(pwm5),
+	CYGNUS_PIN_FUNCTION(key),
+	CYGNUS_PIN_FUNCTION(audio_dte),
+	CYGNUS_PIN_FUNCTION(smart_card0),
+	CYGNUS_PIN_FUNCTION(smart_card1),
+	CYGNUS_PIN_FUNCTION(spi0),
+	CYGNUS_PIN_FUNCTION(spi1),
+	CYGNUS_PIN_FUNCTION(spi2),
+	CYGNUS_PIN_FUNCTION(spi3),
+	CYGNUS_PIN_FUNCTION(spi4),
+	CYGNUS_PIN_FUNCTION(spi5),
+	CYGNUS_PIN_FUNCTION(sw_led0),
+	CYGNUS_PIN_FUNCTION(sw_led1),
+	CYGNUS_PIN_FUNCTION(sw_led2),
+	CYGNUS_PIN_FUNCTION(d1w),
+	CYGNUS_PIN_FUNCTION(lcd),
+	CYGNUS_PIN_FUNCTION(sram),
+	CYGNUS_PIN_FUNCTION(uart0),
+	CYGNUS_PIN_FUNCTION(uart1),
+	CYGNUS_PIN_FUNCTION(uart2),
+	CYGNUS_PIN_FUNCTION(uart3),
+	CYGNUS_PIN_FUNCTION(uart4),
+	CYGNUS_PIN_FUNCTION(qspi),
+	CYGNUS_PIN_FUNCTION(nand),
+	CYGNUS_PIN_FUNCTION(sdio0),
+	CYGNUS_PIN_FUNCTION(sdio1),
+	CYGNUS_PIN_FUNCTION(can0),
+	CYGNUS_PIN_FUNCTION(can1),
+	CYGNUS_PIN_FUNCTION(cam),
+	CYGNUS_PIN_FUNCTION(bsc1),
+	CYGNUS_PIN_FUNCTION(pcie_clkreq),
+	CYGNUS_PIN_FUNCTION(usb0_oc),
+	CYGNUS_PIN_FUNCTION(usb1_oc),
+	CYGNUS_PIN_FUNCTION(usb2_oc),
+};
+
+static int cygnus_get_groups_count(struct pinctrl_dev *pctrl_dev)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->num_groups;
+}
+
+static const char *cygnus_get_group_name(struct pinctrl_dev *pctrl_dev,
+					 unsigned selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->groups[selector].name;
+}
+
+static int cygnus_get_group_pins(struct pinctrl_dev *pctrl_dev,
+				 unsigned selector, const unsigned **pins,
+				 unsigned *num_pins)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	*pins = pinctrl->groups[selector].pins;
+	*num_pins = pinctrl->groups[selector].num_pins;
+
+	return 0;
+}
+
+static void cygnus_pin_dbg_show(struct pinctrl_dev *pctrl_dev,
+				struct seq_file *s, unsigned offset)
+{
+	seq_printf(s, " %s", dev_name(pctrl_dev->dev));
+}
+
+static bool cygnus_function_is_valid(const char *function_name)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(cygnus_pin_functions); i++) {
+		if (!strcmp(cygnus_pin_functions[i].name, function_name))
+			return true;
+	}
+
+	return false;
+}
+
+/*
+ * TODO: Use API from pinctrl framework once "groups" parsing is supported
+ */
+static int cygnus_dt_node_to_map(struct pinctrl_dev *pctrl_dev,
+				 struct device_node *np,
+				 struct pinctrl_map **map,
+				 unsigned *num_maps)
+{
+	int ret, num_groups;
+	unsigned reserved_maps = 0;
+	struct property *prop;
+	const char *group_name, *function_name;
+
+	*map = NULL;
+	*num_maps = 0;
+
+	num_groups = of_property_count_strings(np, "groups");
+	if (num_groups < 0) {
+		dev_err(pctrl_dev->dev, "could not parse property groups\n");
+		return -EINVAL;
+	}
+
+	ret = of_property_read_string(np, "function", &function_name);
+	if (ret < 0) {
+		dev_err(pctrl_dev->dev,	"could not parse property function\n");
+		return -EINVAL;
+	}
+
+	/* check if it's a valid function */
+	if (!cygnus_function_is_valid(function_name)) {
+		dev_warn(pctrl_dev->dev, "invalid function name: %s\n",
+				function_name);
+	}
+
+	ret = pinctrl_utils_reserve_map(pctrl_dev, map, &reserved_maps,
+			num_maps, num_groups);
+	if (ret) {
+		dev_err(pctrl_dev->dev, "unable to reserve map\n");
+		return ret;
+	}
+
+	of_property_for_each_string(np, "groups", prop, group_name) {
+		ret = pinctrl_utils_add_map_mux(pctrl_dev, map,
+				&reserved_maps, num_maps, group_name,
+				function_name);
+		if (ret) {
+			dev_err(pctrl_dev->dev, "can't add map: %d\n", ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static struct pinctrl_ops cygnus_pinctrl_ops = {
+	.get_groups_count = cygnus_get_groups_count,
+	.get_group_name = cygnus_get_group_name,
+	.get_group_pins = cygnus_get_group_pins,
+	.pin_dbg_show = cygnus_pin_dbg_show,
+	.dt_node_to_map = cygnus_dt_node_to_map,
+	.dt_free_map = pinctrl_utils_dt_free_map,
+};
+
+static int cygnus_get_functions_count(struct pinctrl_dev *pctrl_dev)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->num_functions;
+}
+
+static const char *cygnus_get_function_name(struct pinctrl_dev *pctrl_dev,
+					    unsigned selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->functions[selector].name;
+}
+
+static int cygnus_get_function_groups(struct pinctrl_dev *pctrl_dev,
+				      unsigned selector,
+				      const char * const **groups,
+				      unsigned * const num_groups)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	*groups = pinctrl->functions[selector].groups;
+	*num_groups = pinctrl->functions[selector].num_groups;
+
+	return 0;
+}
+
+static int cygnus_pinmux_set(struct cygnus_pinctrl *pinctrl,
+			     const struct cygnus_pin_function *func,
+			     const struct cygnus_pin_group *grp,
+			     struct cygnus_mux_log *mux_log)
+{
+	const struct cygnus_mux *mux = &grp->mux;
+	int i;
+	u32 val, mask = 0x7;
+	unsigned long flags;
+
+	for (i = 0; i < CYGNUS_NUM_IOMUX; i++) {
+		if (mux->offset != mux_log[i].mux.offset ||
+		    mux->shift != mux_log[i].mux.shift)
+			continue;
+
+		/* match found if we reach here */
+
+		/* if this is a new configuration, just do it! */
+		if (!mux_log[i].is_configured)
+			break;
+
+		/*
+		 * IOMUX has been configured previously and one is trying to
+		 * configure it to a different function
+		 */
+		if (mux_log[i].mux.alt != mux->alt) {
+			dev_err(pinctrl->dev,
+				"double configuration error detected!\n");
+			dev_err(pinctrl->dev, "func:%s grp:%s\n",
+				func->name, grp->name);
+			return -EINVAL;
+		} else {
+			/*
+			 * One tries to configure it to the same function.
+			 * Just quit and don't bother
+			 */
+			return 0;
+		}
+	}
+
+	mux_log[i].mux.alt = mux->alt;
+	mux_log[i].is_configured = true;
+
+	spin_lock_irqsave(&pinctrl->lock, flags);
+
+	val = readl(pinctrl->base0 + grp->mux.offset);
+	val &= ~(mask << grp->mux.shift);
+	val |= grp->mux.alt << grp->mux.shift;
+	writel(val, pinctrl->base0 + grp->mux.offset);
+
+	spin_unlock_irqrestore(&pinctrl->lock, flags);
+
+	return 0;
+}
+
+static int cygnus_pinmux_set_mux(struct pinctrl_dev *pctrl_dev,
+				 unsigned func_select, unsigned grp_select)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+	const struct cygnus_pin_function *func =
+		&pinctrl->functions[func_select];
+	const struct cygnus_pin_group *grp = &pinctrl->groups[grp_select];
+
+	dev_dbg(pctrl_dev->dev, "func:%u name:%s grp:%u name:%s\n",
+		func_select, func->name, grp_select, grp->name);
+
+	dev_dbg(pctrl_dev->dev, "offset:0x%08x shift:%u alt:%u\n",
+		grp->mux.offset, grp->mux.shift, grp->mux.alt);
+
+	return cygnus_pinmux_set(pinctrl, func, grp, pinctrl->mux_log);
+}
+
+static int cygnus_gpio_request_enable(struct pinctrl_dev *pctrl_dev,
+				      struct pinctrl_gpio_range *range,
+				      unsigned pin)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+	struct cygnus_gpio_mux *mux = pctrl_dev->desc->pins[pin].drv_data;
+	u32 val;
+	unsigned long flags;
+
+	/* not all pins support GPIO pinmux override */
+	if (!mux->is_supported)
+		return -ENOTSUPP;
+
+	spin_lock_irqsave(&pinctrl->lock, flags);
+
+	val = readl(pinctrl->base1 + mux->offset);
+	val |= 0x3 << mux->shift;
+	writel(val, pinctrl->base1 + mux->offset);
+
+	spin_unlock_irqrestore(&pinctrl->lock, flags);
+
+	dev_dbg(pctrl_dev->dev,
+		"gpio request enable pin=%u offset=0x%x shift=%u\n",
+		pin, mux->offset, mux->shift);
+
+	return 0;
+}
+
+static void cygnus_gpio_disable_free(struct pinctrl_dev *pctrl_dev,
+				     struct pinctrl_gpio_range *range,
+				     unsigned pin)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+	struct cygnus_gpio_mux *mux = pctrl_dev->desc->pins[pin].drv_data;
+	u32 val;
+	unsigned long flags;
+
+	if (!mux->is_supported)
+		return;
+
+	spin_lock_irqsave(&pinctrl->lock, flags);
+
+	val = readl(pinctrl->base1 + mux->offset);
+	val &= ~(0x3 << mux->shift);
+	writel(val, pinctrl->base1 + mux->offset);
+
+	spin_unlock_irqrestore(&pinctrl->lock, flags);
+
+	dev_err(pctrl_dev->dev,
+		"gpio disable free pin=%u offset=0x%x shift=%u\n",
+		pin, mux->offset, mux->shift);
+}
+
+static struct pinmux_ops cygnus_pinmux_ops = {
+	.get_functions_count = cygnus_get_functions_count,
+	.get_function_name = cygnus_get_function_name,
+	.get_function_groups = cygnus_get_function_groups,
+	.set_mux = cygnus_pinmux_set_mux,
+	.gpio_request_enable = cygnus_gpio_request_enable,
+	.gpio_disable_free = cygnus_gpio_disable_free,
+};
+
+static struct pinctrl_desc cygnus_pinctrl_desc = {
+	.name = "cygnus-pinmux",
+	.pctlops = &cygnus_pinctrl_ops,
+	.pmxops = &cygnus_pinmux_ops,
+};
+
+static int cygnus_mux_log_init(struct cygnus_pinctrl *pinctrl)
+{
+	struct cygnus_mux_log *log;
+	unsigned int i, j;
+
+	pinctrl->mux_log = devm_kcalloc(pinctrl->dev, CYGNUS_NUM_IOMUX,
+					sizeof(struct cygnus_mux_log),
+					GFP_KERNEL);
+	if (!pinctrl->mux_log)
+		return -ENOMEM;
+
+	log = pinctrl->mux_log;
+	for (i = 0; i < CYGNUS_NUM_IOMUX_REGS; i++) {
+		for (j = 0; j < CYGNUS_NUM_MUX_PER_REG; j++) {
+			log = &pinctrl->mux_log[i * CYGNUS_NUM_MUX_PER_REG
+				+ j];
+			log->mux.offset = i * 4;
+			log->mux.shift = j * 4;
+			log->mux.alt = 0;
+			log->is_configured = false;
+		}
+	}
+
+	return 0;
+}
+
+static int cygnus_pinmux_probe(struct platform_device *pdev)
+{
+	struct cygnus_pinctrl *pinctrl;
+	struct resource *res;
+	int i, ret;
+	struct pinctrl_pin_desc *pins;
+	unsigned num_pins = ARRAY_SIZE(cygnus_pins);
+
+	pinctrl = devm_kzalloc(&pdev->dev, sizeof(*pinctrl), GFP_KERNEL);
+	if (!pinctrl)
+		return -ENOMEM;
+
+	pinctrl->dev = &pdev->dev;
+	platform_set_drvdata(pdev, pinctrl);
+	spin_lock_init(&pinctrl->lock);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	pinctrl->base0 = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(pinctrl->base0)) {
+		dev_err(&pdev->dev, "unable to map I/O space\n");
+		return PTR_ERR(pinctrl->base0);
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	pinctrl->base1 = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(pinctrl->base1)) {
+		dev_err(&pdev->dev, "unable to map I/O space\n");
+		return PTR_ERR(pinctrl->base1);
+	}
+
+	ret = cygnus_mux_log_init(pinctrl);
+	if (ret) {
+		dev_err(&pdev->dev, "unable to initialize IOMUX log\n");
+		return ret;
+	}
+
+	pins = devm_kcalloc(&pdev->dev, num_pins, sizeof(*pins), GFP_KERNEL);
+	if (!pins)
+		return -ENOMEM;
+
+	for (i = 0; i < num_pins; i++) {
+		pins[i].number = cygnus_pins[i].pin;
+		pins[i].name = cygnus_pins[i].name;
+		pins[i].drv_data = &cygnus_pins[i].gpio_mux;
+	}
+
+	pinctrl->groups = cygnus_pin_groups;
+	pinctrl->num_groups = ARRAY_SIZE(cygnus_pin_groups);
+	pinctrl->functions = cygnus_pin_functions;
+	pinctrl->num_functions = ARRAY_SIZE(cygnus_pin_functions);
+	cygnus_pinctrl_desc.pins = pins;
+	cygnus_pinctrl_desc.npins = num_pins;
+
+	pinctrl->pctl = pinctrl_register(&cygnus_pinctrl_desc, &pdev->dev,
+			pinctrl);
+	if (!pinctrl->pctl) {
+		dev_err(&pdev->dev, "unable to register Cygnus IOMUX pinctrl\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static struct of_device_id cygnus_pinmux_of_match[] = {
+	{ .compatible = "brcm,cygnus-pinmux" },
+	{ }
+};
+
+static struct platform_driver cygnus_pinmux_driver = {
+	.driver = {
+		.name = "cygnus-pinmux",
+		.of_match_table = cygnus_pinmux_of_match,
+	},
+	.probe = cygnus_pinmux_probe,
+};
+
+static int __init cygnus_pinmux_init(void)
+{
+	return platform_driver_register(&cygnus_pinmux_driver);
+}
+arch_initcall(cygnus_pinmux_init);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus IOMUX driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v3 3/4] pinctrl: cygnus: add initial IOMUX driver support

[Ray Jui]

This adds the initial driver support for the Broadcom Cygnus IOMUX
controller. The Cygnus IOMUX controller supports group based mux
configuration but allows certain pins to be muxed to GPIO individually

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/pinctrl/bcm/Kconfig              |   13 +
 drivers/pinctrl/bcm/Makefile             |    5 +-
 drivers/pinctrl/bcm/pinctrl-cygnus-mux.c | 1087 ++++++++++++++++++++++++++++++
 3 files changed, 1103 insertions(+), 2 deletions(-)
 create mode 100644 drivers/pinctrl/bcm/pinctrl-cygnus-mux.c

diff --git a/drivers/pinctrl/bcm/Kconfig b/drivers/pinctrl/bcm/Kconfig
index bc6d048..eb13201 100644
--- a/drivers/pinctrl/bcm/Kconfig
+++ b/drivers/pinctrl/bcm/Kconfig
@@ -19,3 +19,16 @@ config PINCTRL_BCM2835
 	bool
 	select PINMUX
 	select PINCONF
+
+config PINCTRL_CYGNUS_MUX
+	bool "Broadcom Cygnus IOMUX driver"
+	depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
+	select PINMUX
+	select GENERIC_PINCONF
+	default ARCH_BCM_CYGNUS
+	help
+	  Say yes here to enable the Broadcom Cygnus IOMUX driver.
+
+	  The Broadcom Cygnus IOMUX driver supports group based IOMUX
+	  configuration, with the exception that certain individual pins
+	  can be overrided to GPIO function
diff --git a/drivers/pinctrl/bcm/Makefile b/drivers/pinctrl/bcm/Makefile
index 7ba80a3..bb6beb6 100644
--- a/drivers/pinctrl/bcm/Makefile
+++ b/drivers/pinctrl/bcm/Makefile
@@ -1,4 +1,5 @@
 # Broadcom pinctrl support
 
-obj-$(CONFIG_PINCTRL_BCM281XX)	+= pinctrl-bcm281xx.o
-obj-$(CONFIG_PINCTRL_BCM2835)	+= pinctrl-bcm2835.o
+obj-$(CONFIG_PINCTRL_BCM281XX)		+= pinctrl-bcm281xx.o
+obj-$(CONFIG_PINCTRL_BCM2835)		+= pinctrl-bcm2835.o
+obj-$(CONFIG_PINCTRL_CYGNUS_MUX)	+= pinctrl-cygnus-mux.o
diff --git a/drivers/pinctrl/bcm/pinctrl-cygnus-mux.c b/drivers/pinctrl/bcm/pinctrl-cygnus-mux.c
new file mode 100644
index 0000000..33565b4
--- /dev/null
+++ b/drivers/pinctrl/bcm/pinctrl-cygnus-mux.c
@@ -0,0 +1,1087 @@
+/* Copyright (C) 2014-2015 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * This file contains the Cygnus IOMUX driver that supports group based PINMUX
+ * configuration. Although PINMUX configuration is mainly group based, the
+ * Cygnus IOMUX controller allows certain pins to be individually muxed to GPIO
+ * function, and therefore be controlled by the Cygnus ASIU GPIO controller
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include "../core.h"
+#include "../pinctrl-utils.h"
+
+#define CYGNUS_NUM_IOMUX_REGS     8
+#define CYGNUS_NUM_MUX_PER_REG    8
+#define CYGNUS_NUM_IOMUX          (CYGNUS_NUM_IOMUX_REGS * \
+				   CYGNUS_NUM_MUX_PER_REG)
+
+/*
+ * Cygnus IOMUX register description
+ *
+ * @offset: register offset for mux configuration of a group
+ * @shift: bit shift for mux configuration of a group
+ * @alt: alternate function to set to
+ */
+struct cygnus_mux {
+	unsigned int offset;
+	unsigned int shift;
+	unsigned int alt;
+};
+
+/*
+ * Keep track of Cygnus IOMUX configuration and prevent double configuration
+ *
+ * @cygnus_mux: Cygnus IOMUX register description
+ * @is_configured: flag to indicate whether a mux setting has already been
+ * configured
+ */
+struct cygnus_mux_log {
+	struct cygnus_mux mux;
+	bool is_configured;
+};
+
+/*
+ * Group based IOMUX configuration
+ *
+ * @name: name of the group
+ * @pins: array of pins used by this group
+ * @num_pins: total number of pins used by this group
+ * @mux: Cygnus group based IOMUX configuration
+ */
+struct cygnus_pin_group {
+	const char *name;
+	const unsigned *pins;
+	const unsigned num_pins;
+	const struct cygnus_mux mux;
+};
+
+/*
+ * Cygnus mux function and supported pin groups
+ *
+ * @name: name of the function
+ * @groups: array of groups that can be supported by this function
+ * @num_groups: total number of groups that can be supported by this function
+ */
+struct cygnus_pin_function {
+	const char *name;
+	const char * const *groups;
+	const unsigned num_groups;
+};
+
+/*
+ * Cygnus IOMUX pinctrl core
+ *
+ * @pctl: pointer to pinctrl_dev
+ * @dev: pointer to device
+ * @base0: first I/O register base of the Cygnus IOMUX controller
+ * @base1: second I/O register base
+ * @groups: pointer to array of groups
+ * @num_groups: total number of groups
+ * @functions: pointer to array of functions
+ * @num_functions: total number of functions
+ * @mux_log: pointer to the array of mux logs
+ * @lock: lock to protect register access
+ */
+struct cygnus_pinctrl {
+	struct pinctrl_dev *pctl;
+	struct device *dev;
+	void __iomem *base0;
+	void __iomem *base1;
+
+	const struct cygnus_pin_group *groups;
+	unsigned num_groups;
+
+	const struct cygnus_pin_function *functions;
+	unsigned num_functions;
+
+	struct cygnus_mux_log *mux_log;
+
+	spinlock_t lock;
+};
+
+/*
+ * Certain pins can be individually muxed to GPIO function
+ *
+ * @is_supported: flag to indicate GPIO mux is supported for this pin
+ * @offset: register offset for GPIO mux override of a pin
+ * @shift: bit shift for GPIO mux override of a pin
+ */
+struct cygnus_gpio_mux {
+	int is_supported;
+	unsigned int offset;
+	unsigned int shift;
+};
+
+/*
+ * Description of a pin in Cygnus
+ *
+ * @pin: pin number
+ * @name: pin name
+ * @gpio_mux: GPIO override related information
+ */
+struct cygnus_pin {
+	unsigned pin;
+	char *name;
+	struct cygnus_gpio_mux gpio_mux;
+};
+
+#define CYGNUS_PIN_DESC(p, n, i, o, s)	\
+{					\
+	.pin = p,			\
+	.name = n,			\
+	.gpio_mux = {			\
+		.is_supported = i,	\
+		.offset = o,		\
+		.shift = s,		\
+	},				\
+}
+
+/*
+ * List of pins in Cygnus
+ */
+static struct cygnus_pin cygnus_pins[] = {
+	CYGNUS_PIN_DESC(0, "ext_device_reset_n", 0, 0, 0),
+	CYGNUS_PIN_DESC(1, "chip_mode0", 0, 0, 0),
+	CYGNUS_PIN_DESC(2, "chip_mode1", 0, 0, 0),
+	CYGNUS_PIN_DESC(3, "chip_mode2", 0, 0, 0),
+	CYGNUS_PIN_DESC(4, "chip_mode3", 0, 0, 0),
+	CYGNUS_PIN_DESC(5, "chip_mode4", 0, 0, 0),
+	CYGNUS_PIN_DESC(6, "bsc0_scl", 0, 0, 0),
+	CYGNUS_PIN_DESC(7, "bsc0_sda", 0, 0, 0),
+	CYGNUS_PIN_DESC(8, "bsc1_scl", 0, 0, 0),
+	CYGNUS_PIN_DESC(9, "bsc1_sda", 0, 0, 0),
+	CYGNUS_PIN_DESC(10, "d1w_dq", 1, 0x28, 0),
+	CYGNUS_PIN_DESC(11, "d1wowstz_l", 1, 0x4, 28),
+	CYGNUS_PIN_DESC(12, "gpio0", 0, 0, 0),
+	CYGNUS_PIN_DESC(13, "gpio1", 0, 0, 0),
+	CYGNUS_PIN_DESC(14, "gpio2", 0, 0, 0),
+	CYGNUS_PIN_DESC(15, "gpio3", 0, 0, 0),
+	CYGNUS_PIN_DESC(16, "gpio4", 0, 0, 0),
+	CYGNUS_PIN_DESC(17, "gpio5", 0, 0, 0),
+	CYGNUS_PIN_DESC(18, "gpio6", 0, 0, 0),
+	CYGNUS_PIN_DESC(19, "gpio7", 0, 0, 0),
+	CYGNUS_PIN_DESC(20, "gpio8", 0, 0, 0),
+	CYGNUS_PIN_DESC(21, "gpio9", 0, 0, 0),
+	CYGNUS_PIN_DESC(22, "gpio10", 0, 0, 0),
+	CYGNUS_PIN_DESC(23, "gpio11", 0, 0, 0),
+	CYGNUS_PIN_DESC(24, "gpio12", 0, 0, 0),
+	CYGNUS_PIN_DESC(25, "gpio13", 0, 0, 0),
+	CYGNUS_PIN_DESC(26, "gpio14", 0, 0, 0),
+	CYGNUS_PIN_DESC(27, "gpio15", 0, 0, 0),
+	CYGNUS_PIN_DESC(28, "gpio16", 0, 0, 0),
+	CYGNUS_PIN_DESC(29, "gpio17", 0, 0, 0),
+	CYGNUS_PIN_DESC(30, "gpio18", 0, 0, 0),
+	CYGNUS_PIN_DESC(31, "gpio19", 0, 0, 0),
+	CYGNUS_PIN_DESC(32, "gpio20", 0, 0, 0),
+	CYGNUS_PIN_DESC(33, "gpio21", 0, 0, 0),
+	CYGNUS_PIN_DESC(34, "gpio22", 0, 0, 0),
+	CYGNUS_PIN_DESC(35, "gpio23", 0, 0, 0),
+	CYGNUS_PIN_DESC(36, "mdc", 0, 0, 0),
+	CYGNUS_PIN_DESC(37, "mdio", 0, 0, 0),
+	CYGNUS_PIN_DESC(38, "pwm0", 1, 0x10, 30),
+	CYGNUS_PIN_DESC(39, "pwm1", 1, 0x10, 28),
+	CYGNUS_PIN_DESC(40, "pwm2", 1, 0x10, 26),
+	CYGNUS_PIN_DESC(41, "pwm3", 1, 0x10, 24),
+	CYGNUS_PIN_DESC(42, "sc0_clk", 1, 0x10, 22),
+	CYGNUS_PIN_DESC(43, "sc0_cmdvcc_l", 1, 0x10, 20),
+	CYGNUS_PIN_DESC(44, "sc0_detect", 1, 0x10, 18),
+	CYGNUS_PIN_DESC(45, "sc0_fcb", 1, 0x10, 16),
+	CYGNUS_PIN_DESC(46, "sc0_io", 1, 0x10, 14),
+	CYGNUS_PIN_DESC(47, "sc0_rst_l", 1, 0x10, 12),
+	CYGNUS_PIN_DESC(48, "sc1_clk", 1, 0x10, 10),
+	CYGNUS_PIN_DESC(49, "sc1_cmdvcc_l", 1, 0x10, 8),
+	CYGNUS_PIN_DESC(50, "sc1_detect", 1, 0x10, 6),
+	CYGNUS_PIN_DESC(51, "sc1_fcb", 1, 0x10, 4),
+	CYGNUS_PIN_DESC(52, "sc1_io", 1, 0x10, 2),
+	CYGNUS_PIN_DESC(53, "sc1_rst_l", 1, 0x10, 0),
+	CYGNUS_PIN_DESC(54, "spi0_clk", 1, 0x18, 10),
+	CYGNUS_PIN_DESC(55, "spi0_mosi", 1, 0x18, 6),
+	CYGNUS_PIN_DESC(56, "spi0_miso", 1, 0x18, 8),
+	CYGNUS_PIN_DESC(57, "spi0_ss", 1, 0x18, 4),
+	CYGNUS_PIN_DESC(58, "spi1_clk", 1, 0x18, 2),
+	CYGNUS_PIN_DESC(59, "spi1_mosi", 1, 0x1c, 30),
+	CYGNUS_PIN_DESC(60, "spi1_miso", 1, 0x18, 0),
+	CYGNUS_PIN_DESC(61, "spi1_ss", 1, 0x1c, 28),
+	CYGNUS_PIN_DESC(62, "spi2_clk", 1, 0x1c, 26),
+	CYGNUS_PIN_DESC(63, "spi2_mosi", 1, 0x1c, 22),
+	CYGNUS_PIN_DESC(64, "spi2_miso", 1, 0x1c, 24),
+	CYGNUS_PIN_DESC(65, "spi2_ss", 1, 0x1c, 20),
+	CYGNUS_PIN_DESC(66, "spi3_clk", 1, 0x1c, 18),
+	CYGNUS_PIN_DESC(67, "spi3_mosi", 1, 0x1c, 14),
+	CYGNUS_PIN_DESC(68, "spi3_miso", 1, 0x1c, 16),
+	CYGNUS_PIN_DESC(69, "spi3_ss", 1, 0x1c, 12),
+	CYGNUS_PIN_DESC(70, "uart0_cts", 1, 0x1c, 10),
+	CYGNUS_PIN_DESC(71, "uart0_rts", 1, 0x1c, 8),
+	CYGNUS_PIN_DESC(72, "uart0_rx", 1, 0x1c, 6),
+	CYGNUS_PIN_DESC(73, "uart0_tx", 1, 0x1c, 4),
+	CYGNUS_PIN_DESC(74, "uart1_cts", 1, 0x1c, 2),
+	CYGNUS_PIN_DESC(75, "uart1_dcd", 1, 0x1c, 0),
+	CYGNUS_PIN_DESC(76, "uart1_dsr", 1, 0x20, 14),
+	CYGNUS_PIN_DESC(77, "uart1_dtr", 1, 0x20, 12),
+	CYGNUS_PIN_DESC(78, "uart1_ri", 1, 0x20, 10),
+	CYGNUS_PIN_DESC(79, "uart1_rts", 1, 0x20, 8),
+	CYGNUS_PIN_DESC(80, "uart1_rx", 1, 0x20, 6),
+	CYGNUS_PIN_DESC(81, "uart1_tx", 1, 0x20, 4),
+	CYGNUS_PIN_DESC(82, "uart3_rx", 1, 0x20, 2),
+	CYGNUS_PIN_DESC(83, "uart3_tx", 1, 0x20, 0),
+	CYGNUS_PIN_DESC(84, "sdio1_clk_sdcard", 1, 0x14, 6),
+	CYGNUS_PIN_DESC(85, "sdio1_cmd", 1, 0x14, 4),
+	CYGNUS_PIN_DESC(86, "sdio1_data0", 1, 0x14, 2),
+	CYGNUS_PIN_DESC(87, "sdio1_data1", 1, 0x14, 0),
+	CYGNUS_PIN_DESC(88, "sdio1_data2", 1, 0x18, 30),
+	CYGNUS_PIN_DESC(89, "sdio1_data3", 1, 0x18, 28),
+	CYGNUS_PIN_DESC(90, "sdio1_wp_n", 1, 0x18, 24),
+	CYGNUS_PIN_DESC(91, "sdio1_card_rst", 1, 0x14, 10),
+	CYGNUS_PIN_DESC(92, "sdio1_led_on", 1, 0x18, 26),
+	CYGNUS_PIN_DESC(93, "sdio1_cd", 1, 0x14, 8),
+	CYGNUS_PIN_DESC(94, "sdio0_clk_sdcard", 1, 0x14, 26),
+	CYGNUS_PIN_DESC(95, "sdio0_cmd", 1, 0x14, 24),
+	CYGNUS_PIN_DESC(96, "sdio0_data0", 1, 0x14, 22),
+	CYGNUS_PIN_DESC(97, "sdio0_data1", 1, 0x14, 20),
+	CYGNUS_PIN_DESC(98, "sdio0_data2", 1, 0x14, 18),
+	CYGNUS_PIN_DESC(99, "sdio0_data3", 1, 0x14, 16),
+	CYGNUS_PIN_DESC(100, "sdio0_wp_n", 1, 0x14, 12),
+	CYGNUS_PIN_DESC(101, "sdio0_card_rst", 1, 0x14, 30),
+	CYGNUS_PIN_DESC(102, "sdio0_led_on", 1, 0x14, 14),
+	CYGNUS_PIN_DESC(103, "sdio0_cd", 1, 0x14, 28),
+	CYGNUS_PIN_DESC(104, "sflash_clk", 1, 0x18, 22),
+	CYGNUS_PIN_DESC(105, "sflash_cs_l", 1, 0x18, 20),
+	CYGNUS_PIN_DESC(106, "sflash_mosi", 1, 0x18, 14),
+	CYGNUS_PIN_DESC(107, "sflash_miso", 1, 0x18, 16),
+	CYGNUS_PIN_DESC(108, "sflash_wp_n", 1, 0x18, 12),
+	CYGNUS_PIN_DESC(109, "sflash_hold_n", 1, 0x18, 18),
+	CYGNUS_PIN_DESC(110, "nand_ale", 1, 0xc, 30),
+	CYGNUS_PIN_DESC(111, "nand_ce0_l", 1, 0xc, 28),
+	CYGNUS_PIN_DESC(112, "nand_ce1_l", 1, 0xc, 26),
+	CYGNUS_PIN_DESC(113, "nand_cle", 1, 0xc, 24),
+	CYGNUS_PIN_DESC(114, "nand_dq0", 1, 0xc, 22),
+	CYGNUS_PIN_DESC(115, "nand_dq1", 1, 0xc, 20),
+	CYGNUS_PIN_DESC(116, "nand_dq2", 1, 0xc, 18),
+	CYGNUS_PIN_DESC(117, "nand_dq3", 1, 0xc, 16),
+	CYGNUS_PIN_DESC(118, "nand_dq4", 1, 0xc, 14),
+	CYGNUS_PIN_DESC(119, "nand_dq5", 1, 0xc, 12),
+	CYGNUS_PIN_DESC(120, "nand_dq6", 1, 0xc, 10),
+	CYGNUS_PIN_DESC(121, "nand_dq7", 1, 0xc, 8),
+	CYGNUS_PIN_DESC(122, "nand_rb_l", 1, 0xc, 6),
+	CYGNUS_PIN_DESC(123, "nand_re_l", 1, 0xc, 4),
+	CYGNUS_PIN_DESC(124, "nand_we_l", 1, 0xc, 2),
+	CYGNUS_PIN_DESC(125, "nand_wp_l", 1, 0xc, 0),
+	CYGNUS_PIN_DESC(126, "lcd_clac", 1, 0x4, 26),
+	CYGNUS_PIN_DESC(127, "lcd_clcp", 1, 0x4, 24),
+	CYGNUS_PIN_DESC(128, "lcd_cld0", 1, 0x4, 22),
+	CYGNUS_PIN_DESC(129, "lcd_cld1", 1, 0x4, 0),
+	CYGNUS_PIN_DESC(130, "lcd_cld10", 1, 0x4, 20),
+	CYGNUS_PIN_DESC(131, "lcd_cld11", 1, 0x4, 18),
+	CYGNUS_PIN_DESC(132, "lcd_cld12", 1, 0x4, 16),
+	CYGNUS_PIN_DESC(133, "lcd_cld13", 1, 0x4, 14),
+	CYGNUS_PIN_DESC(134, "lcd_cld14", 1, 0x4, 12),
+	CYGNUS_PIN_DESC(135, "lcd_cld15", 1, 0x4, 10),
+	CYGNUS_PIN_DESC(136, "lcd_cld16", 1, 0x4, 8),
+	CYGNUS_PIN_DESC(137, "lcd_cld17", 1, 0x4, 6),
+	CYGNUS_PIN_DESC(138, "lcd_cld18", 1, 0x4, 4),
+	CYGNUS_PIN_DESC(139, "lcd_cld19", 1, 0x4, 2),
+	CYGNUS_PIN_DESC(140, "lcd_cld2", 1, 0x8, 22),
+	CYGNUS_PIN_DESC(141, "lcd_cld20", 1, 0x8, 30),
+	CYGNUS_PIN_DESC(142, "lcd_cld21", 1, 0x8, 28),
+	CYGNUS_PIN_DESC(143, "lcd_cld22", 1, 0x8, 26),
+	CYGNUS_PIN_DESC(144, "lcd_cld23", 1, 0x8, 24),
+	CYGNUS_PIN_DESC(145, "lcd_cld3", 1, 0x8, 20),
+	CYGNUS_PIN_DESC(146, "lcd_cld4", 1, 0x8, 18),
+	CYGNUS_PIN_DESC(147, "lcd_cld5", 1, 0x8, 16),
+	CYGNUS_PIN_DESC(148, "lcd_cld6", 1, 0x8, 14),
+	CYGNUS_PIN_DESC(149, "lcd_cld7", 1, 0x8, 12),
+	CYGNUS_PIN_DESC(150, "lcd_cld8", 1, 0x8, 10),
+	CYGNUS_PIN_DESC(151, "lcd_cld9", 1, 0x8, 8),
+	CYGNUS_PIN_DESC(152, "lcd_clfp", 1, 0x8, 6),
+	CYGNUS_PIN_DESC(153, "lcd_clle", 1, 0x8, 4),
+	CYGNUS_PIN_DESC(154, "lcd_cllp", 1, 0x8, 2),
+	CYGNUS_PIN_DESC(155, "lcd_clpower", 1, 0x8, 0),
+	CYGNUS_PIN_DESC(156, "camera_vsync", 1, 0x4, 30),
+	CYGNUS_PIN_DESC(157, "camera_trigger", 1, 0x0, 0),
+	CYGNUS_PIN_DESC(158, "camera_strobe", 1, 0x0, 2),
+	CYGNUS_PIN_DESC(159, "camera_standby", 1, 0x0, 4),
+	CYGNUS_PIN_DESC(160, "camera_reset_n", 1, 0x0, 6),
+	CYGNUS_PIN_DESC(161, "camera_pixdata9", 1, 0x0, 8),
+	CYGNUS_PIN_DESC(162, "camera_pixdata8", 1, 0x0, 10),
+	CYGNUS_PIN_DESC(163, "camera_pixdata7", 1, 0x0, 12),
+	CYGNUS_PIN_DESC(164, "camera_pixdata6", 1, 0x0, 14),
+	CYGNUS_PIN_DESC(165, "camera_pixdata5", 1, 0x0, 16),
+	CYGNUS_PIN_DESC(166, "camera_pixdata4", 1, 0x0, 18),
+	CYGNUS_PIN_DESC(167, "camera_pixdata3", 1, 0x0, 20),
+	CYGNUS_PIN_DESC(168, "camera_pixdata2", 1, 0x0, 22),
+	CYGNUS_PIN_DESC(169, "camera_pixdata1", 1, 0x0, 24),
+	CYGNUS_PIN_DESC(170, "camera_pixdata0", 1, 0x0, 26),
+	CYGNUS_PIN_DESC(171, "camera_pixclk", 1, 0x0, 28),
+	CYGNUS_PIN_DESC(172, "camera_hsync", 1, 0x0, 30),
+	CYGNUS_PIN_DESC(173, "camera_pll_ref_clk", 0, 0, 0),
+	CYGNUS_PIN_DESC(174, "usb_id_indication", 0, 0, 0),
+	CYGNUS_PIN_DESC(175, "usb_vbus_indication", 0, 0, 0),
+	CYGNUS_PIN_DESC(176, "gpio0_3p3", 0, 0, 0),
+	CYGNUS_PIN_DESC(177, "gpio1_3p3", 0, 0, 0),
+	CYGNUS_PIN_DESC(178, "gpio2_3p3", 0, 0, 0),
+	CYGNUS_PIN_DESC(179, "gpio3_3p3", 0, 0, 0),
+};
+
+/*
+ * List of groups of pins
+ */
+static const unsigned bsc1_pins[] = { 8, 9 };
+static const unsigned pcie_clkreq_pins[] = { 8, 9 };
+
+static const unsigned i2s2_0_pins[] = { 12 };
+static const unsigned i2s2_1_pins[] = { 13 };
+static const unsigned i2s2_2_pins[] = { 14 };
+static const unsigned i2s2_3_pins[] = { 15 };
+static const unsigned i2s2_4_pins[] = { 16 };
+
+static const unsigned pwm4_pins[] = { 17 };
+static const unsigned pwm5_pins[] = { 18 };
+
+static const unsigned key0_pins[] = { 20 };
+static const unsigned key1_pins[] = { 21 };
+static const unsigned key2_pins[] = { 22 };
+static const unsigned key3_pins[] = { 23 };
+static const unsigned key4_pins[] = { 24 };
+static const unsigned key5_pins[] = { 25 };
+
+static const unsigned key6_pins[] = { 26 };
+static const unsigned audio_dte0_pins[] = { 26 };
+
+static const unsigned key7_pins[] = { 27 };
+static const unsigned audio_dte1_pins[] = { 27 };
+
+static const unsigned key8_pins[] = { 28 };
+static const unsigned key9_pins[] = { 29 };
+static const unsigned key10_pins[] = { 30 };
+static const unsigned key11_pins[] = { 31 };
+static const unsigned key12_pins[] = { 32 };
+static const unsigned key13_pins[] = { 33 };
+
+static const unsigned key14_pins[] = { 34 };
+static const unsigned audio_dte2_pins[] = { 34 };
+
+static const unsigned key15_pins[] = { 35 };
+static const unsigned audio_dte3_pins[] = { 35 };
+
+static const unsigned pwm0_pins[] = { 38 };
+static const unsigned pwm1_pins[] = { 39 };
+static const unsigned pwm2_pins[] = { 40 };
+static const unsigned pwm3_pins[] = { 41 };
+
+static const unsigned sdio0_pins[] = { 94, 95, 96, 97, 98, 99 };
+
+static const unsigned smart_card0_pins[] = { 42, 43, 44, 46, 47 };
+static const unsigned i2s0_0_pins[] = { 42, 43, 44, 46 };
+static const unsigned spdif_pins[] = { 47 };
+
+static const unsigned smart_card1_pins[] = { 48, 49, 50, 52, 53 };
+static const unsigned i2s1_0_pins[] = { 48, 49, 50, 52 };
+
+static const unsigned spi0_pins[] = { 54, 55, 56, 57 };
+
+static const unsigned spi1_pins[] = { 58, 59, 60, 61 };
+
+static const unsigned spi2_pins[] = { 62, 63, 64, 65 };
+
+static const unsigned spi3_pins[] = { 66, 67, 68, 69 };
+static const unsigned sw_led0_0_pins[] = { 66, 67, 68, 69 };
+
+static const unsigned d1w_pins[] = { 10, 11 };
+static const unsigned uart4_pins[] = { 10, 11 };
+static const unsigned sw_led2_0_pins[] = { 10, 11 };
+
+static const unsigned lcd_pins[] = { 126, 127, 128, 129, 130, 131, 132, 133,
+	134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147,
+	148, 149, 150, 151, 152, 153, 154, 155 };
+static const unsigned sram_0_pins[] = { 126, 127, 128, 129, 130, 131, 132, 133,
+	134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147,
+	148, 149, 150, 151, 152, 153, 154, 155 };
+static const unsigned spi5_pins[] = { 141, 142, 143, 144 };
+
+static const unsigned uart0_pins[] = { 70, 71, 72, 73 };
+static const unsigned sw_led0_1_pins[] = { 70, 71, 72, 73 };
+
+static const unsigned uart1_dte_pins[] = { 75, 76, 77, 78 };
+static const unsigned uart2_pins[] = { 75, 76, 77, 78 };
+
+static const unsigned uart1_pins[] = { 74, 79, 80, 81 };
+
+static const unsigned uart3_pins[] = { 82, 83 };
+
+static const unsigned qspi_0_pins[] = { 104, 105, 106, 107 };
+
+static const unsigned nand_pins[] = { 110, 111, 112, 113, 114, 115, 116, 117,
+	118, 119, 120, 121, 122, 123, 124, 125 };
+
+static const unsigned sdio0_cd_pins[] = { 103 };
+
+static const unsigned sdio0_mmc_pins[] = { 100, 101, 102 };
+
+static const unsigned sdio1_data_0_pins[] = { 86, 87 };
+static const unsigned can0_pins[] = { 86, 87 };
+static const unsigned spi4_0_pins[] = { 86, 87 };
+
+static const unsigned sdio1_data_1_pins[] = { 88, 89 };
+static const unsigned can1_pins[] = { 88, 89 };
+static const unsigned spi4_1_pins[] = { 88, 89 };
+
+static const unsigned sdio1_cd_pins[] = { 93 };
+
+static const unsigned sdio1_led_pins[] = { 84, 85 };
+static const unsigned sw_led2_1_pins[] = { 84, 85 };
+
+static const unsigned sdio1_mmc_pins[] = { 90, 91, 92 };
+
+static const unsigned cam_led_pins[] = { 156, 157, 158, 159, 160 };
+static const unsigned sw_led1_pins[] = { 156, 157, 158, 159 };
+
+static const unsigned cam_0_pins[] = { 169, 170, 171, 169, 170 };
+
+static const unsigned cam_1_pins[] = { 161, 162, 163, 164, 165, 166, 167,
+	168 };
+static const unsigned sram_1_pins[] = { 161, 162, 163, 164, 165, 166, 167,
+	168 };
+
+static const unsigned qspi_1_pins[] = { 108, 109 };
+
+static const unsigned smart_card0_fcb_pins[] = { 45 };
+static const unsigned i2s0_1_pins[] = { 45 };
+
+static const unsigned smart_card1_fcb_pins[] = { 51 };
+static const unsigned i2s1_1_pins[] = { 51 };
+
+static const unsigned gpio0_3p3_pins[] = { 176 };
+static const unsigned usb0_oc_pins[] = { 176 };
+
+static const unsigned gpio1_3p3_pins[] = { 177 };
+static const unsigned usb1_oc_pins[] = { 177 };
+
+static const unsigned gpio2_3p3_pins[] = { 178 };
+static const unsigned usb2_oc_pins[] = { 178 };
+
+#define CYGNUS_PIN_GROUP(group_name, off, sh, al)	\
+{							\
+	.name = #group_name"""_grp",			\
+	.pins = group_name ## _pins,			\
+	.num_pins = ARRAY_SIZE(group_name ## _pins),	\
+	.mux = {					\
+		.offset = off,				\
+		.shift = sh,				\
+		.alt = al,				\
+	}						\
+}
+
+/*
+ * List of Cygnus pin groups
+ */
+static const struct cygnus_pin_group cygnus_pin_groups[] = {
+	CYGNUS_PIN_GROUP(i2s2_0, 0x0, 0, 2),
+	CYGNUS_PIN_GROUP(i2s2_1, 0x0, 4, 2),
+	CYGNUS_PIN_GROUP(i2s2_2, 0x0, 8, 2),
+	CYGNUS_PIN_GROUP(i2s2_3, 0x0, 12, 2),
+	CYGNUS_PIN_GROUP(i2s2_4, 0x0, 16, 2),
+	CYGNUS_PIN_GROUP(pwm4, 0x0, 20, 0),
+	CYGNUS_PIN_GROUP(pwm5, 0x0, 24, 2),
+	CYGNUS_PIN_GROUP(key0, 0x4, 0, 1),
+	CYGNUS_PIN_GROUP(key1, 0x4, 4, 1),
+	CYGNUS_PIN_GROUP(key2, 0x4, 8, 1),
+	CYGNUS_PIN_GROUP(key3, 0x4, 12, 1),
+	CYGNUS_PIN_GROUP(key4, 0x4, 16, 1),
+	CYGNUS_PIN_GROUP(key5, 0x4, 20, 1),
+	CYGNUS_PIN_GROUP(key6, 0x4, 24, 1),
+	CYGNUS_PIN_GROUP(audio_dte0, 0x4, 24, 2),
+	CYGNUS_PIN_GROUP(key7, 0x4, 28, 1),
+	CYGNUS_PIN_GROUP(audio_dte1, 0x4, 28, 2),
+	CYGNUS_PIN_GROUP(key8, 0x8, 0, 1),
+	CYGNUS_PIN_GROUP(key9, 0x8, 4, 1),
+	CYGNUS_PIN_GROUP(key10, 0x8, 8, 1),
+	CYGNUS_PIN_GROUP(key11, 0x8, 12, 1),
+	CYGNUS_PIN_GROUP(key12, 0x8, 16, 1),
+	CYGNUS_PIN_GROUP(key13, 0x8, 20, 1),
+	CYGNUS_PIN_GROUP(key14, 0x8, 24, 1),
+	CYGNUS_PIN_GROUP(audio_dte2, 0x8, 24, 2),
+	CYGNUS_PIN_GROUP(key15, 0x8, 28, 1),
+	CYGNUS_PIN_GROUP(audio_dte3, 0x8, 28, 2),
+	CYGNUS_PIN_GROUP(pwm0, 0xc, 0, 0),
+	CYGNUS_PIN_GROUP(pwm1, 0xc, 4, 0),
+	CYGNUS_PIN_GROUP(pwm2, 0xc, 8, 0),
+	CYGNUS_PIN_GROUP(pwm3, 0xc, 12, 0),
+	CYGNUS_PIN_GROUP(sdio0, 0xc, 16, 0),
+	CYGNUS_PIN_GROUP(smart_card0, 0xc, 20, 0),
+	CYGNUS_PIN_GROUP(i2s0_0, 0xc, 20, 1),
+	CYGNUS_PIN_GROUP(spdif, 0xc, 20, 1),
+	CYGNUS_PIN_GROUP(smart_card1, 0xc, 24, 0),
+	CYGNUS_PIN_GROUP(i2s1_0, 0xc, 24, 1),
+	CYGNUS_PIN_GROUP(spi0, 0x10, 0, 0),
+	CYGNUS_PIN_GROUP(spi1, 0x10, 4, 0),
+	CYGNUS_PIN_GROUP(spi2, 0x10, 8, 0),
+	CYGNUS_PIN_GROUP(spi3, 0x10, 12, 0),
+	CYGNUS_PIN_GROUP(sw_led0_0, 0x10, 12, 2),
+	CYGNUS_PIN_GROUP(d1w, 0x10, 16, 0),
+	CYGNUS_PIN_GROUP(uart4, 0x10, 16, 1),
+	CYGNUS_PIN_GROUP(sw_led2_0, 0x10, 16, 2),
+	CYGNUS_PIN_GROUP(lcd, 0x10, 20, 0),
+	CYGNUS_PIN_GROUP(sram_0, 0x10, 20, 1),
+	CYGNUS_PIN_GROUP(spi5, 0x10, 20, 2),
+	CYGNUS_PIN_GROUP(uart0, 0x14, 0, 0),
+	CYGNUS_PIN_GROUP(sw_led0_1, 0x14, 0, 2),
+	CYGNUS_PIN_GROUP(uart1_dte, 0x14, 4, 0),
+	CYGNUS_PIN_GROUP(uart2, 0x14, 4, 1),
+	CYGNUS_PIN_GROUP(uart1, 0x14, 8, 0),
+	CYGNUS_PIN_GROUP(uart3, 0x14, 12, 0),
+	CYGNUS_PIN_GROUP(qspi_0, 0x14, 16, 0),
+	CYGNUS_PIN_GROUP(nand, 0x14, 20, 0),
+	CYGNUS_PIN_GROUP(sdio0_cd, 0x18, 0, 0),
+	CYGNUS_PIN_GROUP(sdio0_mmc, 0x18, 4, 0),
+	CYGNUS_PIN_GROUP(sdio1_data_0, 0x18, 8, 0),
+	CYGNUS_PIN_GROUP(can0, 0x18, 8, 1),
+	CYGNUS_PIN_GROUP(spi4_0, 0x18, 8, 2),
+	CYGNUS_PIN_GROUP(sdio1_data_1, 0x18, 12, 0),
+	CYGNUS_PIN_GROUP(can1, 0x18, 12, 1),
+	CYGNUS_PIN_GROUP(spi4_1, 0x18, 12, 2),
+	CYGNUS_PIN_GROUP(sdio1_cd, 0x18, 16, 0),
+	CYGNUS_PIN_GROUP(sdio1_led, 0x18, 20, 0),
+	CYGNUS_PIN_GROUP(sw_led2_1, 0x18, 20, 2),
+	CYGNUS_PIN_GROUP(sdio1_mmc, 0x18, 24, 0),
+	CYGNUS_PIN_GROUP(cam_led, 0x1c, 0, 0),
+	CYGNUS_PIN_GROUP(sw_led1, 0x1c, 0, 1),
+	CYGNUS_PIN_GROUP(cam_0, 0x1c, 4, 0),
+	CYGNUS_PIN_GROUP(cam_1, 0x1c, 8, 0),
+	CYGNUS_PIN_GROUP(sram_1, 0x1c, 8, 1),
+	CYGNUS_PIN_GROUP(qspi_1, 0x1c, 12, 0),
+	CYGNUS_PIN_GROUP(bsc1, 0x1c, 16, 0),
+	CYGNUS_PIN_GROUP(pcie_clkreq, 0x1c, 16, 1),
+	CYGNUS_PIN_GROUP(smart_card0_fcb, 0x20, 0, 0),
+	CYGNUS_PIN_GROUP(i2s0_1, 0x20, 0, 1),
+	CYGNUS_PIN_GROUP(smart_card1_fcb, 0x20, 4, 0),
+	CYGNUS_PIN_GROUP(i2s1_1, 0x20, 4, 1),
+	CYGNUS_PIN_GROUP(gpio0_3p3, 0x28, 0, 0),
+	CYGNUS_PIN_GROUP(usb0_oc, 0x28, 0, 1),
+	CYGNUS_PIN_GROUP(gpio1_3p3, 0x28, 4, 0),
+	CYGNUS_PIN_GROUP(usb1_oc, 0x28, 4, 1),
+	CYGNUS_PIN_GROUP(gpio2_3p3, 0x28, 8, 0),
+	CYGNUS_PIN_GROUP(usb2_oc, 0x28, 8, 1),
+};
+
+/*
+ * List of groups supported by functions
+ */
+static const char * const i2s0_grps[] = { "i2s0_0_grp", "i2s0_1_grp" };
+static const char * const i2s1_grps[] = { "i2s1_0_grp", "i2s1_1_grp" };
+static const char * const i2s2_grps[] = { "i2s2_0_grp", "i2s2_1_grp",
+	"i2s2_2_grp", "i2s2_3_grp", "i2s2_4_grp" };
+static const char * const spdif_grps[] = { "spdif_grp" };
+static const char * const pwm0_grps[] = { "pwm0_grp" };
+static const char * const pwm1_grps[] = { "pwm1_grp" };
+static const char * const pwm2_grps[] = { "pwm2_grp" };
+static const char * const pwm3_grps[] = { "pwm3_grp" };
+static const char * const pwm4_grps[] = { "pwm4_grp" };
+static const char * const pwm5_grps[] = { "pwm5_grp" };
+static const char * const key_grps[] = { "key0_grp", "key1_grp", "key2_grp",
+	"key3_grp", "key4_grp", "key5_grp", "key6_grp", "key7_grp", "key8_grp",
+	"key9_grp", "key10_grp", "key11_grp", "key12_grp", "key13_grp",
+	"key14_grp", "key15_grp" };
+static const char * const audio_dte_grps[] = { "audio_dte0_grp",
+	"audio_dte1_grp", "audio_dte2_grp", "audio_dte3_grp" };
+static const char * const smart_card0_grps[] = { "smart_card0_grp",
+	"smart_card0_fcb_grp" };
+static const char * const smart_card1_grps[] = { "smart_card1_grp",
+	"smart_card1_fcb_grp" };
+static const char * const spi0_grps[] = { "spi0_grp" };
+static const char * const spi1_grps[] = { "spi1_grp" };
+static const char * const spi2_grps[] = { "spi2_grp" };
+static const char * const spi3_grps[] = { "spi3_grp" };
+static const char * const spi4_grps[] = { "spi4_0_grp", "spi4_1_grp" };
+static const char * const spi5_grps[] = { "spi5_grp" };
+
+static const char * const sw_led0_grps[] = { "sw_led0_0_grp",
+	"sw_led0_1_grp" };
+static const char * const sw_led1_grps[] = { "sw_led1_grp" };
+static const char * const sw_led2_grps[] = { "sw_led2_0_grp",
+	"sw_led2_1_grp" };
+static const char * const d1w_grps[] = { "d1w_grp" };
+static const char * const lcd_grps[] = { "lcd_grp" };
+static const char * const sram_grps[] = { "sram_0_grp", "sram_1_grp" };
+
+static const char * const uart0_grps[] = { "uart0_grp" };
+static const char * const uart1_grps[] = { "uart1_grp", "uart1_dte_grp" };
+static const char * const uart2_grps[] = { "uart2_grp" };
+static const char * const uart3_grps[] = { "uart3_grp" };
+static const char * const uart4_grps[] = { "uart4_grp" };
+static const char * const qspi_grps[] = { "qspi_0_grp", "qspi_1_grp" };
+static const char * const nand_grps[] = { "nand_grp" };
+static const char * const sdio0_grps[] = { "sdio0_grp", "sdio0_cd_grp",
+	"sdio0_mmc_grp" };
+static const char * const sdio1_grps[] = { "sdio1_data_0_grp",
+	"sdio1_data_1_grp", "sdio1_cd_grp", "sdio1_led_grp", "sdio1_mmc_grp" };
+static const char * const can0_grps[] = { "can0_grp" };
+static const char * const can1_grps[] = { "can1_grp" };
+static const char * const cam_grps[] = { "cam_led_grp", "cam_0_grp",
+	"cam_1_grp" };
+static const char * const bsc1_grps[] = { "bsc1_grp" };
+static const char * const pcie_clkreq_grps[] = { "pcie_clkreq_grp" };
+static const char * const usb0_oc_grps[] = { "usb0_oc_grp" };
+static const char * const usb1_oc_grps[] = { "usb1_oc_grp" };
+static const char * const usb2_oc_grps[] = { "usb2_oc_grp" };
+
+#define CYGNUS_PIN_FUNCTION(func)				\
+{								\
+	.name = #func,						\
+	.groups = func ## _grps,				\
+	.num_groups = ARRAY_SIZE(func ## _grps),		\
+}
+
+/*
+ * List of supported functions in Cygnus
+ */
+static const struct cygnus_pin_function cygnus_pin_functions[] = {
+	CYGNUS_PIN_FUNCTION(i2s0),
+	CYGNUS_PIN_FUNCTION(i2s1),
+	CYGNUS_PIN_FUNCTION(i2s2),
+	CYGNUS_PIN_FUNCTION(spdif),
+	CYGNUS_PIN_FUNCTION(pwm0),
+	CYGNUS_PIN_FUNCTION(pwm1),
+	CYGNUS_PIN_FUNCTION(pwm2),
+	CYGNUS_PIN_FUNCTION(pwm3),
+	CYGNUS_PIN_FUNCTION(pwm4),
+	CYGNUS_PIN_FUNCTION(pwm5),
+	CYGNUS_PIN_FUNCTION(key),
+	CYGNUS_PIN_FUNCTION(audio_dte),
+	CYGNUS_PIN_FUNCTION(smart_card0),
+	CYGNUS_PIN_FUNCTION(smart_card1),
+	CYGNUS_PIN_FUNCTION(spi0),
+	CYGNUS_PIN_FUNCTION(spi1),
+	CYGNUS_PIN_FUNCTION(spi2),
+	CYGNUS_PIN_FUNCTION(spi3),
+	CYGNUS_PIN_FUNCTION(spi4),
+	CYGNUS_PIN_FUNCTION(spi5),
+	CYGNUS_PIN_FUNCTION(sw_led0),
+	CYGNUS_PIN_FUNCTION(sw_led1),
+	CYGNUS_PIN_FUNCTION(sw_led2),
+	CYGNUS_PIN_FUNCTION(d1w),
+	CYGNUS_PIN_FUNCTION(lcd),
+	CYGNUS_PIN_FUNCTION(sram),
+	CYGNUS_PIN_FUNCTION(uart0),
+	CYGNUS_PIN_FUNCTION(uart1),
+	CYGNUS_PIN_FUNCTION(uart2),
+	CYGNUS_PIN_FUNCTION(uart3),
+	CYGNUS_PIN_FUNCTION(uart4),
+	CYGNUS_PIN_FUNCTION(qspi),
+	CYGNUS_PIN_FUNCTION(nand),
+	CYGNUS_PIN_FUNCTION(sdio0),
+	CYGNUS_PIN_FUNCTION(sdio1),
+	CYGNUS_PIN_FUNCTION(can0),
+	CYGNUS_PIN_FUNCTION(can1),
+	CYGNUS_PIN_FUNCTION(cam),
+	CYGNUS_PIN_FUNCTION(bsc1),
+	CYGNUS_PIN_FUNCTION(pcie_clkreq),
+	CYGNUS_PIN_FUNCTION(usb0_oc),
+	CYGNUS_PIN_FUNCTION(usb1_oc),
+	CYGNUS_PIN_FUNCTION(usb2_oc),
+};
+
+static int cygnus_get_groups_count(struct pinctrl_dev *pctrl_dev)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->num_groups;
+}
+
+static const char *cygnus_get_group_name(struct pinctrl_dev *pctrl_dev,
+					 unsigned selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->groups[selector].name;
+}
+
+static int cygnus_get_group_pins(struct pinctrl_dev *pctrl_dev,
+				 unsigned selector, const unsigned **pins,
+				 unsigned *num_pins)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	*pins = pinctrl->groups[selector].pins;
+	*num_pins = pinctrl->groups[selector].num_pins;
+
+	return 0;
+}
+
+static void cygnus_pin_dbg_show(struct pinctrl_dev *pctrl_dev,
+				struct seq_file *s, unsigned offset)
+{
+	seq_printf(s, " %s", dev_name(pctrl_dev->dev));
+}
+
+static bool cygnus_function_is_valid(const char *function_name)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(cygnus_pin_functions); i++) {
+		if (!strcmp(cygnus_pin_functions[i].name, function_name))
+			return true;
+	}
+
+	return false;
+}
+
+/*
+ * TODO: Use API from pinctrl framework once "groups" parsing is supported
+ */
+static int cygnus_dt_node_to_map(struct pinctrl_dev *pctrl_dev,
+				 struct device_node *np,
+				 struct pinctrl_map **map,
+				 unsigned *num_maps)
+{
+	int ret, num_groups;
+	unsigned reserved_maps = 0;
+	struct property *prop;
+	const char *group_name, *function_name;
+
+	*map = NULL;
+	*num_maps = 0;
+
+	num_groups = of_property_count_strings(np, "groups");
+	if (num_groups < 0) {
+		dev_err(pctrl_dev->dev, "could not parse property groups\n");
+		return -EINVAL;
+	}
+
+	ret = of_property_read_string(np, "function", &function_name);
+	if (ret < 0) {
+		dev_err(pctrl_dev->dev,	"could not parse property function\n");
+		return -EINVAL;
+	}
+
+	/* check if it's a valid function */
+	if (!cygnus_function_is_valid(function_name)) {
+		dev_warn(pctrl_dev->dev, "invalid function name: %s\n",
+				function_name);
+	}
+
+	ret = pinctrl_utils_reserve_map(pctrl_dev, map, &reserved_maps,
+			num_maps, num_groups);
+	if (ret) {
+		dev_err(pctrl_dev->dev, "unable to reserve map\n");
+		return ret;
+	}
+
+	of_property_for_each_string(np, "groups", prop, group_name) {
+		ret = pinctrl_utils_add_map_mux(pctrl_dev, map,
+				&reserved_maps, num_maps, group_name,
+				function_name);
+		if (ret) {
+			dev_err(pctrl_dev->dev, "can't add map: %d\n", ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static struct pinctrl_ops cygnus_pinctrl_ops = {
+	.get_groups_count = cygnus_get_groups_count,
+	.get_group_name = cygnus_get_group_name,
+	.get_group_pins = cygnus_get_group_pins,
+	.pin_dbg_show = cygnus_pin_dbg_show,
+	.dt_node_to_map = cygnus_dt_node_to_map,
+	.dt_free_map = pinctrl_utils_dt_free_map,
+};
+
+static int cygnus_get_functions_count(struct pinctrl_dev *pctrl_dev)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->num_functions;
+}
+
+static const char *cygnus_get_function_name(struct pinctrl_dev *pctrl_dev,
+					    unsigned selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->functions[selector].name;
+}
+
+static int cygnus_get_function_groups(struct pinctrl_dev *pctrl_dev,
+				      unsigned selector,
+				      const char * const **groups,
+				      unsigned * const num_groups)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	*groups = pinctrl->functions[selector].groups;
+	*num_groups = pinctrl->functions[selector].num_groups;
+
+	return 0;
+}
+
+static int cygnus_pinmux_set(struct cygnus_pinctrl *pinctrl,
+			     const struct cygnus_pin_function *func,
+			     const struct cygnus_pin_group *grp,
+			     struct cygnus_mux_log *mux_log)
+{
+	const struct cygnus_mux *mux = &grp->mux;
+	int i;
+	u32 val, mask = 0x7;
+	unsigned long flags;
+
+	for (i = 0; i < CYGNUS_NUM_IOMUX; i++) {
+		if (mux->offset != mux_log[i].mux.offset ||
+		    mux->shift != mux_log[i].mux.shift)
+			continue;
+
+		/* match found if we reach here */
+
+		/* if this is a new configuration, just do it! */
+		if (!mux_log[i].is_configured)
+			break;
+
+		/*
+		 * IOMUX has been configured previously and one is trying to
+		 * configure it to a different function
+		 */
+		if (mux_log[i].mux.alt != mux->alt) {
+			dev_err(pinctrl->dev,
+				"double configuration error detected!\n");
+			dev_err(pinctrl->dev, "func:%s grp:%s\n",
+				func->name, grp->name);
+			return -EINVAL;
+		} else {
+			/*
+			 * One tries to configure it to the same function.
+			 * Just quit and don't bother
+			 */
+			return 0;
+		}
+	}
+
+	mux_log[i].mux.alt = mux->alt;
+	mux_log[i].is_configured = true;
+
+	spin_lock_irqsave(&pinctrl->lock, flags);
+
+	val = readl(pinctrl->base0 + grp->mux.offset);
+	val &= ~(mask << grp->mux.shift);
+	val |= grp->mux.alt << grp->mux.shift;
+	writel(val, pinctrl->base0 + grp->mux.offset);
+
+	spin_unlock_irqrestore(&pinctrl->lock, flags);
+
+	return 0;
+}
+
+static int cygnus_pinmux_set_mux(struct pinctrl_dev *pctrl_dev,
+				 unsigned func_select, unsigned grp_select)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+	const struct cygnus_pin_function *func =
+		&pinctrl->functions[func_select];
+	const struct cygnus_pin_group *grp = &pinctrl->groups[grp_select];
+
+	dev_dbg(pctrl_dev->dev, "func:%u name:%s grp:%u name:%s\n",
+		func_select, func->name, grp_select, grp->name);
+
+	dev_dbg(pctrl_dev->dev, "offset:0x%08x shift:%u alt:%u\n",
+		grp->mux.offset, grp->mux.shift, grp->mux.alt);
+
+	return cygnus_pinmux_set(pinctrl, func, grp, pinctrl->mux_log);
+}
+
+static int cygnus_gpio_request_enable(struct pinctrl_dev *pctrl_dev,
+				      struct pinctrl_gpio_range *range,
+				      unsigned pin)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+	struct cygnus_gpio_mux *mux = pctrl_dev->desc->pins[pin].drv_data;
+	u32 val;
+	unsigned long flags;
+
+	/* not all pins support GPIO pinmux override */
+	if (!mux->is_supported)
+		return -ENOTSUPP;
+
+	spin_lock_irqsave(&pinctrl->lock, flags);
+
+	val = readl(pinctrl->base1 + mux->offset);
+	val |= 0x3 << mux->shift;
+	writel(val, pinctrl->base1 + mux->offset);
+
+	spin_unlock_irqrestore(&pinctrl->lock, flags);
+
+	dev_dbg(pctrl_dev->dev,
+		"gpio request enable pin=%u offset=0x%x shift=%u\n",
+		pin, mux->offset, mux->shift);
+
+	return 0;
+}
+
+static void cygnus_gpio_disable_free(struct pinctrl_dev *pctrl_dev,
+				     struct pinctrl_gpio_range *range,
+				     unsigned pin)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+	struct cygnus_gpio_mux *mux = pctrl_dev->desc->pins[pin].drv_data;
+	u32 val;
+	unsigned long flags;
+
+	if (!mux->is_supported)
+		return;
+
+	spin_lock_irqsave(&pinctrl->lock, flags);
+
+	val = readl(pinctrl->base1 + mux->offset);
+	val &= ~(0x3 << mux->shift);
+	writel(val, pinctrl->base1 + mux->offset);
+
+	spin_unlock_irqrestore(&pinctrl->lock, flags);
+
+	dev_err(pctrl_dev->dev,
+		"gpio disable free pin=%u offset=0x%x shift=%u\n",
+		pin, mux->offset, mux->shift);
+}
+
+static struct pinmux_ops cygnus_pinmux_ops = {
+	.get_functions_count = cygnus_get_functions_count,
+	.get_function_name = cygnus_get_function_name,
+	.get_function_groups = cygnus_get_function_groups,
+	.set_mux = cygnus_pinmux_set_mux,
+	.gpio_request_enable = cygnus_gpio_request_enable,
+	.gpio_disable_free = cygnus_gpio_disable_free,
+};
+
+static struct pinctrl_desc cygnus_pinctrl_desc = {
+	.name = "cygnus-pinmux",
+	.pctlops = &cygnus_pinctrl_ops,
+	.pmxops = &cygnus_pinmux_ops,
+};
+
+static int cygnus_mux_log_init(struct cygnus_pinctrl *pinctrl)
+{
+	struct cygnus_mux_log *log;
+	unsigned int i, j;
+
+	pinctrl->mux_log = devm_kcalloc(pinctrl->dev, CYGNUS_NUM_IOMUX,
+					sizeof(struct cygnus_mux_log),
+					GFP_KERNEL);
+	if (!pinctrl->mux_log)
+		return -ENOMEM;
+
+	log = pinctrl->mux_log;
+	for (i = 0; i < CYGNUS_NUM_IOMUX_REGS; i++) {
+		for (j = 0; j < CYGNUS_NUM_MUX_PER_REG; j++) {
+			log = &pinctrl->mux_log[i * CYGNUS_NUM_MUX_PER_REG
+				+ j];
+			log->mux.offset = i * 4;
+			log->mux.shift = j * 4;
+			log->mux.alt = 0;
+			log->is_configured = false;
+		}
+	}
+
+	return 0;
+}
+
+static int cygnus_pinmux_probe(struct platform_device *pdev)
+{
+	struct cygnus_pinctrl *pinctrl;
+	struct resource *res;
+	int i, ret;
+	struct pinctrl_pin_desc *pins;
+	unsigned num_pins = ARRAY_SIZE(cygnus_pins);
+
+	pinctrl = devm_kzalloc(&pdev->dev, sizeof(*pinctrl), GFP_KERNEL);
+	if (!pinctrl)
+		return -ENOMEM;
+
+	pinctrl->dev = &pdev->dev;
+	platform_set_drvdata(pdev, pinctrl);
+	spin_lock_init(&pinctrl->lock);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	pinctrl->base0 = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(pinctrl->base0)) {
+		dev_err(&pdev->dev, "unable to map I/O space\n");
+		return PTR_ERR(pinctrl->base0);
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	pinctrl->base1 = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(pinctrl->base1)) {
+		dev_err(&pdev->dev, "unable to map I/O space\n");
+		return PTR_ERR(pinctrl->base1);
+	}
+
+	ret = cygnus_mux_log_init(pinctrl);
+	if (ret) {
+		dev_err(&pdev->dev, "unable to initialize IOMUX log\n");
+		return ret;
+	}
+
+	pins = devm_kcalloc(&pdev->dev, num_pins, sizeof(*pins), GFP_KERNEL);
+	if (!pins)
+		return -ENOMEM;
+
+	for (i = 0; i < num_pins; i++) {
+		pins[i].number = cygnus_pins[i].pin;
+		pins[i].name = cygnus_pins[i].name;
+		pins[i].drv_data = &cygnus_pins[i].gpio_mux;
+	}
+
+	pinctrl->groups = cygnus_pin_groups;
+	pinctrl->num_groups = ARRAY_SIZE(cygnus_pin_groups);
+	pinctrl->functions = cygnus_pin_functions;
+	pinctrl->num_functions = ARRAY_SIZE(cygnus_pin_functions);
+	cygnus_pinctrl_desc.pins = pins;
+	cygnus_pinctrl_desc.npins = num_pins;
+
+	pinctrl->pctl = pinctrl_register(&cygnus_pinctrl_desc, &pdev->dev,
+			pinctrl);
+	if (!pinctrl->pctl) {
+		dev_err(&pdev->dev, "unable to register Cygnus IOMUX pinctrl\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static struct of_device_id cygnus_pinmux_of_match[] = {
+	{ .compatible = "brcm,cygnus-pinmux" },
+	{ }
+};
+
+static struct platform_driver cygnus_pinmux_driver = {
+	.driver = {
+		.name = "cygnus-pinmux",
+		.of_match_table = cygnus_pinmux_of_match,
+	},
+	.probe = cygnus_pinmux_probe,
+};
+
+static int __init cygnus_pinmux_init(void)
+{
+	return platform_driver_register(&cygnus_pinmux_driver);
+}
+arch_initcall(cygnus_pinmux_init);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus IOMUX driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v3 4/4] ARM: dts: enable IOMUX for Broadcom Cygnus

[Ray Jui]

This enables the IOMUX support for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..b014ce5 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -54,6 +54,12 @@
 
 	/include/ "bcm-cygnus-clock.dtsi"
 
+	pinctrl: pinctrl@0x0301d0c8 {
+		compatible = "brcm,cygnus-pinmux";
+		reg = <0x0301d0c8 0x30>,
+		      <0x0301d24c 0x2c>;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

[PATCH v3 4/4] ARM: dts: enable IOMUX for Broadcom Cygnus

[Ray Jui]

This enables the IOMUX support for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..b014ce5 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -54,6 +54,12 @@
 
 	/include/ "bcm-cygnus-clock.dtsi"
 
+	pinctrl: pinctrl@0x0301d0c8 {
+		compatible = "brcm,cygnus-pinmux";
+		reg = <0x0301d0c8 0x30>,
+		      <0x0301d24c 0x2c>;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

[PATCH v3 4/4] ARM: dts: enable IOMUX for Broadcom Cygnus

[Ray Jui]

This enables the IOMUX support for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..b014ce5 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -54,6 +54,12 @@
 
 	/include/ "bcm-cygnus-clock.dtsi"
 
+	pinctrl: pinctrl at 0x0301d0c8 {
+		compatible = "brcm,cygnus-pinmux";
+		reg = <0x0301d0c8 0x30>,
+		      <0x0301d24c 0x2c>;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

Re: [PATCH v3 3/4] pinctrl: cygnus: add initial IOMUX driver support

[Dmitry Torokhov]

Hi Ray,

On Mon, Feb 02, 2015 at 06:01:33PM -0800, Ray Jui wrote:
> This adds the initial driver support for the Broadcom Cygnus IOMUX
> controller. The Cygnus IOMUX controller supports group based mux
> configuration but allows certain pins to be muxed to GPIO individually
> 
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>

Just a few random nits/comments...

> ---
>  drivers/pinctrl/bcm/Kconfig              |   13 +
>  drivers/pinctrl/bcm/Makefile             |    5 +-
>  drivers/pinctrl/bcm/pinctrl-cygnus-mux.c | 1087 ++++++++++++++++++++++++++++++
>  3 files changed, 1103 insertions(+), 2 deletions(-)
>  create mode 100644 drivers/pinctrl/bcm/pinctrl-cygnus-mux.c
> 
> diff --git a/drivers/pinctrl/bcm/Kconfig b/drivers/pinctrl/bcm/Kconfig
> index bc6d048..eb13201 100644
> --- a/drivers/pinctrl/bcm/Kconfig
> +++ b/drivers/pinctrl/bcm/Kconfig
> @@ -19,3 +19,16 @@ config PINCTRL_BCM2835
>  	bool
>  	select PINMUX
>  	select PINCONF
> +
> +config PINCTRL_CYGNUS_MUX
> +	bool "Broadcom Cygnus IOMUX driver"
> +	depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
> +	select PINMUX
> +	select GENERIC_PINCONF
> +	default ARCH_BCM_CYGNUS
> +	help
> +	  Say yes here to enable the Broadcom Cygnus IOMUX driver.
> +
> +	  The Broadcom Cygnus IOMUX driver supports group based IOMUX
> +	  configuration, with the exception that certain individual pins
> +	  can be overrided to GPIO function
> diff --git a/drivers/pinctrl/bcm/Makefile b/drivers/pinctrl/bcm/Makefile
> index 7ba80a3..bb6beb6 100644
> --- a/drivers/pinctrl/bcm/Makefile
> +++ b/drivers/pinctrl/bcm/Makefile
> @@ -1,4 +1,5 @@
>  # Broadcom pinctrl support
>  
> -obj-$(CONFIG_PINCTRL_BCM281XX)	+= pinctrl-bcm281xx.o
> -obj-$(CONFIG_PINCTRL_BCM2835)	+= pinctrl-bcm2835.o
> +obj-$(CONFIG_PINCTRL_BCM281XX)		+= pinctrl-bcm281xx.o
> +obj-$(CONFIG_PINCTRL_BCM2835)		+= pinctrl-bcm2835.o
> +obj-$(CONFIG_PINCTRL_CYGNUS_MUX)	+= pinctrl-cygnus-mux.o
> diff --git a/drivers/pinctrl/bcm/pinctrl-cygnus-mux.c b/drivers/pinctrl/bcm/pinctrl-cygnus-mux.c
> new file mode 100644
> index 0000000..33565b4
> --- /dev/null
> +++ b/drivers/pinctrl/bcm/pinctrl-cygnus-mux.c
> @@ -0,0 +1,1087 @@
> +/* Copyright (C) 2014-2015 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * This file contains the Cygnus IOMUX driver that supports group based PINMUX
> + * configuration. Although PINMUX configuration is mainly group based, the
> + * Cygnus IOMUX controller allows certain pins to be individually muxed to GPIO
> + * function, and therefore be controlled by the Cygnus ASIU GPIO controller
> + */
> +
> +#include <linux/err.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/slab.h>
> +#include <linux/platform_device.h>
> +#include <linux/pinctrl/pinctrl.h>
> +#include <linux/pinctrl/pinmux.h>
> +#include <linux/pinctrl/pinconf.h>
> +#include <linux/pinctrl/pinconf-generic.h>
> +#include "../core.h"
> +#include "../pinctrl-utils.h"
> +
> +#define CYGNUS_NUM_IOMUX_REGS     8
> +#define CYGNUS_NUM_MUX_PER_REG    8
> +#define CYGNUS_NUM_IOMUX          (CYGNUS_NUM_IOMUX_REGS * \
> +				   CYGNUS_NUM_MUX_PER_REG)
> +
> +/*
> + * Cygnus IOMUX register description
> + *
> + * @offset: register offset for mux configuration of a group
> + * @shift: bit shift for mux configuration of a group
> + * @alt: alternate function to set to
> + */
> +struct cygnus_mux {
> +	unsigned int offset;
> +	unsigned int shift;
> +	unsigned int alt;
> +};
> +
> +/*
> + * Keep track of Cygnus IOMUX configuration and prevent double configuration
> + *
> + * @cygnus_mux: Cygnus IOMUX register description
> + * @is_configured: flag to indicate whether a mux setting has already been
> + * configured
> + */
> +struct cygnus_mux_log {
> +	struct cygnus_mux mux;
> +	bool is_configured;
> +};
> +
> +/*
> + * Group based IOMUX configuration
> + *
> + * @name: name of the group
> + * @pins: array of pins used by this group
> + * @num_pins: total number of pins used by this group
> + * @mux: Cygnus group based IOMUX configuration
> + */
> +struct cygnus_pin_group {
> +	const char *name;
> +	const unsigned *pins;
> +	const unsigned num_pins;
> +	const struct cygnus_mux mux;

Not: the last 2 consts are quite weird - if you want to make an instance
of cygnus_pin_group immutable you declare it as a const (and I see you
are already doing that below). With the structure as it laid out
currently you can only do static initializers.

> +};
> +
> +/*
> + * Cygnus mux function and supported pin groups
> + *
> + * @name: name of the function
> + * @groups: array of groups that can be supported by this function
> + * @num_groups: total number of groups that can be supported by this function
> + */
> +struct cygnus_pin_function {
> +	const char *name;
> +	const char * const *groups;
> +	const unsigned num_groups;

Here as well.

...

> +
> +/*
> + * List of pins in Cygnus
> + */
> +static struct cygnus_pin cygnus_pins[] = {

const?

> +	CYGNUS_PIN_DESC(0, "ext_device_reset_n", 0, 0, 0),
> +	CYGNUS_PIN_DESC(1, "chip_mode0", 0, 0, 0),

...

> +#define CYGNUS_PIN_GROUP(group_name, off, sh, al)	\
> +{							\
> +	.name = #group_name"""_grp",			\

Why do we need extra pair of quotes? BTW we can also do

	.name = __stringify(group_name) "_grp",

> +	.pins = group_name ## _pins,			\
> +	.num_pins = ARRAY_SIZE(group_name ## _pins),	\
> +	.mux = {					\
> +		.offset = off,				\
> +		.shift = sh,				\
> +		.alt = al,				\
> +	}						\
> +}

...

> +
> +static struct pinctrl_ops cygnus_pinctrl_ops = {

const?

> +	.get_groups_count = cygnus_get_groups_count,
> +	.get_group_name = cygnus_get_group_name,
> +	.get_group_pins = cygnus_get_group_pins,
> +	.pin_dbg_show = cygnus_pin_dbg_show,
> +	.dt_node_to_map = cygnus_dt_node_to_map,
> +	.dt_free_map = pinctrl_utils_dt_free_map,
> +};
> +
> +static int cygnus_get_functions_count(struct pinctrl_dev *pctrl_dev)
> +{
> +	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
> +
> +	return pinctrl->num_functions;
> +}
> +
> +static const char *cygnus_get_function_name(struct pinctrl_dev *pctrl_dev,
> +					    unsigned selector)
> +{
> +	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
> +
> +	return pinctrl->functions[selector].name;
> +}
> +
> +static int cygnus_get_function_groups(struct pinctrl_dev *pctrl_dev,
> +				      unsigned selector,
> +				      const char * const **groups,
> +				      unsigned * const num_groups)
> +{
> +	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
> +
> +	*groups = pinctrl->functions[selector].groups;
> +	*num_groups = pinctrl->functions[selector].num_groups;
> +
> +	return 0;
> +}
> +
> +static int cygnus_pinmux_set(struct cygnus_pinctrl *pinctrl,
> +			     const struct cygnus_pin_function *func,
> +			     const struct cygnus_pin_group *grp,
> +			     struct cygnus_mux_log *mux_log)
> +{
> +	const struct cygnus_mux *mux = &grp->mux;
> +	int i;
> +	u32 val, mask = 0x7;
> +	unsigned long flags;
> +
> +	for (i = 0; i < CYGNUS_NUM_IOMUX; i++) {
> +		if (mux->offset != mux_log[i].mux.offset ||
> +		    mux->shift != mux_log[i].mux.shift)
> +			continue;
> +
> +		/* match found if we reach here */
> +
> +		/* if this is a new configuration, just do it! */
> +		if (!mux_log[i].is_configured)
> +			break;
> +
> +		/*
> +		 * IOMUX has been configured previously and one is trying to
> +		 * configure it to a different function
> +		 */
> +		if (mux_log[i].mux.alt != mux->alt) {
> +			dev_err(pinctrl->dev,
> +				"double configuration error detected!\n");
> +			dev_err(pinctrl->dev, "func:%s grp:%s\n",
> +				func->name, grp->name);
> +			return -EINVAL;
> +		} else {
> +			/*
> +			 * One tries to configure it to the same function.
> +			 * Just quit and don't bother
> +			 */
> +			return 0;
> +		}
> +	}
> +
> +	mux_log[i].mux.alt = mux->alt;
> +	mux_log[i].is_configured = true;
> +
> +	spin_lock_irqsave(&pinctrl->lock, flags);
> +
> +	val = readl(pinctrl->base0 + grp->mux.offset);
> +	val &= ~(mask << grp->mux.shift);
> +	val |= grp->mux.alt << grp->mux.shift;
> +	writel(val, pinctrl->base0 + grp->mux.offset);
> +
> +	spin_unlock_irqrestore(&pinctrl->lock, flags);
> +
> +	return 0;
> +}
> +
> +static int cygnus_pinmux_set_mux(struct pinctrl_dev *pctrl_dev,
> +				 unsigned func_select, unsigned grp_select)
> +{
> +	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
> +	const struct cygnus_pin_function *func =
> +		&pinctrl->functions[func_select];
> +	const struct cygnus_pin_group *grp = &pinctrl->groups[grp_select];
> +
> +	dev_dbg(pctrl_dev->dev, "func:%u name:%s grp:%u name:%s\n",
> +		func_select, func->name, grp_select, grp->name);
> +
> +	dev_dbg(pctrl_dev->dev, "offset:0x%08x shift:%u alt:%u\n",
> +		grp->mux.offset, grp->mux.shift, grp->mux.alt);
> +
> +	return cygnus_pinmux_set(pinctrl, func, grp, pinctrl->mux_log);
> +}
> +
> +static int cygnus_gpio_request_enable(struct pinctrl_dev *pctrl_dev,
> +				      struct pinctrl_gpio_range *range,
> +				      unsigned pin)
> +{
> +	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
> +	struct cygnus_gpio_mux *mux = pctrl_dev->desc->pins[pin].drv_data;

const?

> +	u32 val;
> +	unsigned long flags;
> +
> +	/* not all pins support GPIO pinmux override */
> +	if (!mux->is_supported)
> +		return -ENOTSUPP;
> +
> +	spin_lock_irqsave(&pinctrl->lock, flags);
> +
> +	val = readl(pinctrl->base1 + mux->offset);
> +	val |= 0x3 << mux->shift;
> +	writel(val, pinctrl->base1 + mux->offset);
> +
> +	spin_unlock_irqrestore(&pinctrl->lock, flags);
> +
> +	dev_dbg(pctrl_dev->dev,
> +		"gpio request enable pin=%u offset=0x%x shift=%u\n",
> +		pin, mux->offset, mux->shift);
> +
> +	return 0;
> +}
> +
> +static void cygnus_gpio_disable_free(struct pinctrl_dev *pctrl_dev,
> +				     struct pinctrl_gpio_range *range,
> +				     unsigned pin)
> +{
> +	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
> +	struct cygnus_gpio_mux *mux = pctrl_dev->desc->pins[pin].drv_data;
> +	u32 val;
> +	unsigned long flags;
> +
> +	if (!mux->is_supported)
> +		return;
> +
> +	spin_lock_irqsave(&pinctrl->lock, flags);
> +
> +	val = readl(pinctrl->base1 + mux->offset);
> +	val &= ~(0x3 << mux->shift);
> +	writel(val, pinctrl->base1 + mux->offset);
> +
> +	spin_unlock_irqrestore(&pinctrl->lock, flags);
> +
> +	dev_err(pctrl_dev->dev,
> +		"gpio disable free pin=%u offset=0x%x shift=%u\n",
> +		pin, mux->offset, mux->shift);
> +}
> +
> +static struct pinmux_ops cygnus_pinmux_ops = {

const?

> +	.get_functions_count = cygnus_get_functions_count,
> +	.get_function_name = cygnus_get_function_name,
> +	.get_function_groups = cygnus_get_function_groups,
> +	.set_mux = cygnus_pinmux_set_mux,
> +	.gpio_request_enable = cygnus_gpio_request_enable,
> +	.gpio_disable_free = cygnus_gpio_disable_free,
> +};
> +
> +static struct pinctrl_desc cygnus_pinctrl_desc = {
> +	.name = "cygnus-pinmux",
> +	.pctlops = &cygnus_pinctrl_ops,
> +	.pmxops = &cygnus_pinmux_ops,
> +};
> +
> +static int cygnus_mux_log_init(struct cygnus_pinctrl *pinctrl)
> +{
> +	struct cygnus_mux_log *log;
> +	unsigned int i, j;
> +
> +	pinctrl->mux_log = devm_kcalloc(pinctrl->dev, CYGNUS_NUM_IOMUX,
> +					sizeof(struct cygnus_mux_log),
> +					GFP_KERNEL);
> +	if (!pinctrl->mux_log)
> +		return -ENOMEM;
> +
> +	log = pinctrl->mux_log;
> +	for (i = 0; i < CYGNUS_NUM_IOMUX_REGS; i++) {
> +		for (j = 0; j < CYGNUS_NUM_MUX_PER_REG; j++) {
> +			log = &pinctrl->mux_log[i * CYGNUS_NUM_MUX_PER_REG
> +				+ j];
> +			log->mux.offset = i * 4;
> +			log->mux.shift = j * 4;
> +			log->mux.alt = 0;
> +			log->is_configured = false;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +static int cygnus_pinmux_probe(struct platform_device *pdev)
> +{
> +	struct cygnus_pinctrl *pinctrl;
> +	struct resource *res;
> +	int i, ret;
> +	struct pinctrl_pin_desc *pins;
> +	unsigned num_pins = ARRAY_SIZE(cygnus_pins);
> +
> +	pinctrl = devm_kzalloc(&pdev->dev, sizeof(*pinctrl), GFP_KERNEL);
> +	if (!pinctrl)
> +		return -ENOMEM;
> +
> +	pinctrl->dev = &pdev->dev;
> +	platform_set_drvdata(pdev, pinctrl);
> +	spin_lock_init(&pinctrl->lock);
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	pinctrl->base0 = devm_ioremap_resource(&pdev->dev, res);
> +	if (IS_ERR(pinctrl->base0)) {
> +		dev_err(&pdev->dev, "unable to map I/O space\n");
> +		return PTR_ERR(pinctrl->base0);
> +	}
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> +	pinctrl->base1 = devm_ioremap_resource(&pdev->dev, res);
> +	if (IS_ERR(pinctrl->base1)) {
> +		dev_err(&pdev->dev, "unable to map I/O space\n");
> +		return PTR_ERR(pinctrl->base1);
> +	}
> +
> +	ret = cygnus_mux_log_init(pinctrl);
> +	if (ret) {
> +		dev_err(&pdev->dev, "unable to initialize IOMUX log\n");
> +		return ret;
> +	}
> +
> +	pins = devm_kcalloc(&pdev->dev, num_pins, sizeof(*pins), GFP_KERNEL);
> +	if (!pins)
> +		return -ENOMEM;
> +
> +	for (i = 0; i < num_pins; i++) {
> +		pins[i].number = cygnus_pins[i].pin;
> +		pins[i].name = cygnus_pins[i].name;
> +		pins[i].drv_data = &cygnus_pins[i].gpio_mux;
> +	}
> +
> +	pinctrl->groups = cygnus_pin_groups;
> +	pinctrl->num_groups = ARRAY_SIZE(cygnus_pin_groups);
> +	pinctrl->functions = cygnus_pin_functions;
> +	pinctrl->num_functions = ARRAY_SIZE(cygnus_pin_functions);
> +	cygnus_pinctrl_desc.pins = pins;
> +	cygnus_pinctrl_desc.npins = num_pins;
> +
> +	pinctrl->pctl = pinctrl_register(&cygnus_pinctrl_desc, &pdev->dev,
> +			pinctrl);
> +	if (!pinctrl->pctl) {
> +		dev_err(&pdev->dev, "unable to register Cygnus IOMUX pinctrl\n");
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +static struct of_device_id cygnus_pinmux_of_match[] = {
> +	{ .compatible = "brcm,cygnus-pinmux" },
> +	{ }
> +};
> +
> +static struct platform_driver cygnus_pinmux_driver = {
> +	.driver = {
> +		.name = "cygnus-pinmux",
> +		.of_match_table = cygnus_pinmux_of_match,
> +	},
> +	.probe = cygnus_pinmux_probe,

You also need to either provide remove() method or disallow unbinding
via sysfs by setting suppress_bind_attrs in platform driver.

> +};
> +
> +static int __init cygnus_pinmux_init(void)
> +{
> +	return platform_driver_register(&cygnus_pinmux_driver);
> +}
> +arch_initcall(cygnus_pinmux_init);
> +
> +MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
> +MODULE_DESCRIPTION("Broadcom Cygnus IOMUX driver");
> +MODULE_LICENSE("GPL v2");
> -- 
> 1.7.9.5
> 

Thanks.

-- 
Dmitry

[PATCH v3 3/4] pinctrl: cygnus: add initial IOMUX driver support

[Dmitry Torokhov]

Hi Ray,

On Mon, Feb 02, 2015 at 06:01:33PM -0800, Ray Jui wrote:
> This adds the initial driver support for the Broadcom Cygnus IOMUX
> controller. The Cygnus IOMUX controller supports group based mux
> configuration but allows certain pins to be muxed to GPIO individually
> 
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>

Just a few random nits/comments...

> ---
>  drivers/pinctrl/bcm/Kconfig              |   13 +
>  drivers/pinctrl/bcm/Makefile             |    5 +-
>  drivers/pinctrl/bcm/pinctrl-cygnus-mux.c | 1087 ++++++++++++++++++++++++++++++
>  3 files changed, 1103 insertions(+), 2 deletions(-)
>  create mode 100644 drivers/pinctrl/bcm/pinctrl-cygnus-mux.c
> 
> diff --git a/drivers/pinctrl/bcm/Kconfig b/drivers/pinctrl/bcm/Kconfig
> index bc6d048..eb13201 100644
> --- a/drivers/pinctrl/bcm/Kconfig
> +++ b/drivers/pinctrl/bcm/Kconfig
> @@ -19,3 +19,16 @@ config PINCTRL_BCM2835
>  	bool
>  	select PINMUX
>  	select PINCONF
> +
> +config PINCTRL_CYGNUS_MUX
> +	bool "Broadcom Cygnus IOMUX driver"
> +	depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
> +	select PINMUX
> +	select GENERIC_PINCONF
> +	default ARCH_BCM_CYGNUS
> +	help
> +	  Say yes here to enable the Broadcom Cygnus IOMUX driver.
> +
> +	  The Broadcom Cygnus IOMUX driver supports group based IOMUX
> +	  configuration, with the exception that certain individual pins
> +	  can be overrided to GPIO function
> diff --git a/drivers/pinctrl/bcm/Makefile b/drivers/pinctrl/bcm/Makefile
> index 7ba80a3..bb6beb6 100644
> --- a/drivers/pinctrl/bcm/Makefile
> +++ b/drivers/pinctrl/bcm/Makefile
> @@ -1,4 +1,5 @@
>  # Broadcom pinctrl support
>  
> -obj-$(CONFIG_PINCTRL_BCM281XX)	+= pinctrl-bcm281xx.o
> -obj-$(CONFIG_PINCTRL_BCM2835)	+= pinctrl-bcm2835.o
> +obj-$(CONFIG_PINCTRL_BCM281XX)		+= pinctrl-bcm281xx.o
> +obj-$(CONFIG_PINCTRL_BCM2835)		+= pinctrl-bcm2835.o
> +obj-$(CONFIG_PINCTRL_CYGNUS_MUX)	+= pinctrl-cygnus-mux.o
> diff --git a/drivers/pinctrl/bcm/pinctrl-cygnus-mux.c b/drivers/pinctrl/bcm/pinctrl-cygnus-mux.c
> new file mode 100644
> index 0000000..33565b4
> --- /dev/null
> +++ b/drivers/pinctrl/bcm/pinctrl-cygnus-mux.c
> @@ -0,0 +1,1087 @@
> +/* Copyright (C) 2014-2015 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * This file contains the Cygnus IOMUX driver that supports group based PINMUX
> + * configuration. Although PINMUX configuration is mainly group based, the
> + * Cygnus IOMUX controller allows certain pins to be individually muxed to GPIO
> + * function, and therefore be controlled by the Cygnus ASIU GPIO controller
> + */
> +
> +#include <linux/err.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/slab.h>
> +#include <linux/platform_device.h>
> +#include <linux/pinctrl/pinctrl.h>
> +#include <linux/pinctrl/pinmux.h>
> +#include <linux/pinctrl/pinconf.h>
> +#include <linux/pinctrl/pinconf-generic.h>
> +#include "../core.h"
> +#include "../pinctrl-utils.h"
> +
> +#define CYGNUS_NUM_IOMUX_REGS     8
> +#define CYGNUS_NUM_MUX_PER_REG    8
> +#define CYGNUS_NUM_IOMUX          (CYGNUS_NUM_IOMUX_REGS * \
> +				   CYGNUS_NUM_MUX_PER_REG)
> +
> +/*
> + * Cygnus IOMUX register description
> + *
> + * @offset: register offset for mux configuration of a group
> + * @shift: bit shift for mux configuration of a group
> + * @alt: alternate function to set to
> + */
> +struct cygnus_mux {
> +	unsigned int offset;
> +	unsigned int shift;
> +	unsigned int alt;
> +};
> +
> +/*
> + * Keep track of Cygnus IOMUX configuration and prevent double configuration
> + *
> + * @cygnus_mux: Cygnus IOMUX register description
> + * @is_configured: flag to indicate whether a mux setting has already been
> + * configured
> + */
> +struct cygnus_mux_log {
> +	struct cygnus_mux mux;
> +	bool is_configured;
> +};
> +
> +/*
> + * Group based IOMUX configuration
> + *
> + * @name: name of the group
> + * @pins: array of pins used by this group
> + * @num_pins: total number of pins used by this group
> + * @mux: Cygnus group based IOMUX configuration
> + */
> +struct cygnus_pin_group {
> +	const char *name;
> +	const unsigned *pins;
> +	const unsigned num_pins;
> +	const struct cygnus_mux mux;

Not: the last 2 consts are quite weird - if you want to make an instance
of cygnus_pin_group immutable you declare it as a const (and I see you
are already doing that below). With the structure as it laid out
currently you can only do static initializers.

> +};
> +
> +/*
> + * Cygnus mux function and supported pin groups
> + *
> + * @name: name of the function
> + * @groups: array of groups that can be supported by this function
> + * @num_groups: total number of groups that can be supported by this function
> + */
> +struct cygnus_pin_function {
> +	const char *name;
> +	const char * const *groups;
> +	const unsigned num_groups;

Here as well.

...

> +
> +/*
> + * List of pins in Cygnus
> + */
> +static struct cygnus_pin cygnus_pins[] = {

const?

> +	CYGNUS_PIN_DESC(0, "ext_device_reset_n", 0, 0, 0),
> +	CYGNUS_PIN_DESC(1, "chip_mode0", 0, 0, 0),

...

> +#define CYGNUS_PIN_GROUP(group_name, off, sh, al)	\
> +{							\
> +	.name = #group_name"""_grp",			\

Why do we need extra pair of quotes? BTW we can also do

	.name = __stringify(group_name) "_grp",

> +	.pins = group_name ## _pins,			\
> +	.num_pins = ARRAY_SIZE(group_name ## _pins),	\
> +	.mux = {					\
> +		.offset = off,				\
> +		.shift = sh,				\
> +		.alt = al,				\
> +	}						\
> +}

...

> +
> +static struct pinctrl_ops cygnus_pinctrl_ops = {

const?

> +	.get_groups_count = cygnus_get_groups_count,
> +	.get_group_name = cygnus_get_group_name,
> +	.get_group_pins = cygnus_get_group_pins,
> +	.pin_dbg_show = cygnus_pin_dbg_show,
> +	.dt_node_to_map = cygnus_dt_node_to_map,
> +	.dt_free_map = pinctrl_utils_dt_free_map,
> +};
> +
> +static int cygnus_get_functions_count(struct pinctrl_dev *pctrl_dev)
> +{
> +	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
> +
> +	return pinctrl->num_functions;
> +}
> +
> +static const char *cygnus_get_function_name(struct pinctrl_dev *pctrl_dev,
> +					    unsigned selector)
> +{
> +	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
> +
> +	return pinctrl->functions[selector].name;
> +}
> +
> +static int cygnus_get_function_groups(struct pinctrl_dev *pctrl_dev,
> +				      unsigned selector,
> +				      const char * const **groups,
> +				      unsigned * const num_groups)
> +{
> +	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
> +
> +	*groups = pinctrl->functions[selector].groups;
> +	*num_groups = pinctrl->functions[selector].num_groups;
> +
> +	return 0;
> +}
> +
> +static int cygnus_pinmux_set(struct cygnus_pinctrl *pinctrl,
> +			     const struct cygnus_pin_function *func,
> +			     const struct cygnus_pin_group *grp,
> +			     struct cygnus_mux_log *mux_log)
> +{
> +	const struct cygnus_mux *mux = &grp->mux;
> +	int i;
> +	u32 val, mask = 0x7;
> +	unsigned long flags;
> +
> +	for (i = 0; i < CYGNUS_NUM_IOMUX; i++) {
> +		if (mux->offset != mux_log[i].mux.offset ||
> +		    mux->shift != mux_log[i].mux.shift)
> +			continue;
> +
> +		/* match found if we reach here */
> +
> +		/* if this is a new configuration, just do it! */
> +		if (!mux_log[i].is_configured)
> +			break;
> +
> +		/*
> +		 * IOMUX has been configured previously and one is trying to
> +		 * configure it to a different function
> +		 */
> +		if (mux_log[i].mux.alt != mux->alt) {
> +			dev_err(pinctrl->dev,
> +				"double configuration error detected!\n");
> +			dev_err(pinctrl->dev, "func:%s grp:%s\n",
> +				func->name, grp->name);
> +			return -EINVAL;
> +		} else {
> +			/*
> +			 * One tries to configure it to the same function.
> +			 * Just quit and don't bother
> +			 */
> +			return 0;
> +		}
> +	}
> +
> +	mux_log[i].mux.alt = mux->alt;
> +	mux_log[i].is_configured = true;
> +
> +	spin_lock_irqsave(&pinctrl->lock, flags);
> +
> +	val = readl(pinctrl->base0 + grp->mux.offset);
> +	val &= ~(mask << grp->mux.shift);
> +	val |= grp->mux.alt << grp->mux.shift;
> +	writel(val, pinctrl->base0 + grp->mux.offset);
> +
> +	spin_unlock_irqrestore(&pinctrl->lock, flags);
> +
> +	return 0;
> +}
> +
> +static int cygnus_pinmux_set_mux(struct pinctrl_dev *pctrl_dev,
> +				 unsigned func_select, unsigned grp_select)
> +{
> +	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
> +	const struct cygnus_pin_function *func =
> +		&pinctrl->functions[func_select];
> +	const struct cygnus_pin_group *grp = &pinctrl->groups[grp_select];
> +
> +	dev_dbg(pctrl_dev->dev, "func:%u name:%s grp:%u name:%s\n",
> +		func_select, func->name, grp_select, grp->name);
> +
> +	dev_dbg(pctrl_dev->dev, "offset:0x%08x shift:%u alt:%u\n",
> +		grp->mux.offset, grp->mux.shift, grp->mux.alt);
> +
> +	return cygnus_pinmux_set(pinctrl, func, grp, pinctrl->mux_log);
> +}
> +
> +static int cygnus_gpio_request_enable(struct pinctrl_dev *pctrl_dev,
> +				      struct pinctrl_gpio_range *range,
> +				      unsigned pin)
> +{
> +	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
> +	struct cygnus_gpio_mux *mux = pctrl_dev->desc->pins[pin].drv_data;

const?

> +	u32 val;
> +	unsigned long flags;
> +
> +	/* not all pins support GPIO pinmux override */
> +	if (!mux->is_supported)
> +		return -ENOTSUPP;
> +
> +	spin_lock_irqsave(&pinctrl->lock, flags);
> +
> +	val = readl(pinctrl->base1 + mux->offset);
> +	val |= 0x3 << mux->shift;
> +	writel(val, pinctrl->base1 + mux->offset);
> +
> +	spin_unlock_irqrestore(&pinctrl->lock, flags);
> +
> +	dev_dbg(pctrl_dev->dev,
> +		"gpio request enable pin=%u offset=0x%x shift=%u\n",
> +		pin, mux->offset, mux->shift);
> +
> +	return 0;
> +}
> +
> +static void cygnus_gpio_disable_free(struct pinctrl_dev *pctrl_dev,
> +				     struct pinctrl_gpio_range *range,
> +				     unsigned pin)
> +{
> +	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
> +	struct cygnus_gpio_mux *mux = pctrl_dev->desc->pins[pin].drv_data;
> +	u32 val;
> +	unsigned long flags;
> +
> +	if (!mux->is_supported)
> +		return;
> +
> +	spin_lock_irqsave(&pinctrl->lock, flags);
> +
> +	val = readl(pinctrl->base1 + mux->offset);
> +	val &= ~(0x3 << mux->shift);
> +	writel(val, pinctrl->base1 + mux->offset);
> +
> +	spin_unlock_irqrestore(&pinctrl->lock, flags);
> +
> +	dev_err(pctrl_dev->dev,
> +		"gpio disable free pin=%u offset=0x%x shift=%u\n",
> +		pin, mux->offset, mux->shift);
> +}
> +
> +static struct pinmux_ops cygnus_pinmux_ops = {

const?

> +	.get_functions_count = cygnus_get_functions_count,
> +	.get_function_name = cygnus_get_function_name,
> +	.get_function_groups = cygnus_get_function_groups,
> +	.set_mux = cygnus_pinmux_set_mux,
> +	.gpio_request_enable = cygnus_gpio_request_enable,
> +	.gpio_disable_free = cygnus_gpio_disable_free,
> +};
> +
> +static struct pinctrl_desc cygnus_pinctrl_desc = {
> +	.name = "cygnus-pinmux",
> +	.pctlops = &cygnus_pinctrl_ops,
> +	.pmxops = &cygnus_pinmux_ops,
> +};
> +
> +static int cygnus_mux_log_init(struct cygnus_pinctrl *pinctrl)
> +{
> +	struct cygnus_mux_log *log;
> +	unsigned int i, j;
> +
> +	pinctrl->mux_log = devm_kcalloc(pinctrl->dev, CYGNUS_NUM_IOMUX,
> +					sizeof(struct cygnus_mux_log),
> +					GFP_KERNEL);
> +	if (!pinctrl->mux_log)
> +		return -ENOMEM;
> +
> +	log = pinctrl->mux_log;
> +	for (i = 0; i < CYGNUS_NUM_IOMUX_REGS; i++) {
> +		for (j = 0; j < CYGNUS_NUM_MUX_PER_REG; j++) {
> +			log = &pinctrl->mux_log[i * CYGNUS_NUM_MUX_PER_REG
> +				+ j];
> +			log->mux.offset = i * 4;
> +			log->mux.shift = j * 4;
> +			log->mux.alt = 0;
> +			log->is_configured = false;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +static int cygnus_pinmux_probe(struct platform_device *pdev)
> +{
> +	struct cygnus_pinctrl *pinctrl;
> +	struct resource *res;
> +	int i, ret;
> +	struct pinctrl_pin_desc *pins;
> +	unsigned num_pins = ARRAY_SIZE(cygnus_pins);
> +
> +	pinctrl = devm_kzalloc(&pdev->dev, sizeof(*pinctrl), GFP_KERNEL);
> +	if (!pinctrl)
> +		return -ENOMEM;
> +
> +	pinctrl->dev = &pdev->dev;
> +	platform_set_drvdata(pdev, pinctrl);
> +	spin_lock_init(&pinctrl->lock);
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	pinctrl->base0 = devm_ioremap_resource(&pdev->dev, res);
> +	if (IS_ERR(pinctrl->base0)) {
> +		dev_err(&pdev->dev, "unable to map I/O space\n");
> +		return PTR_ERR(pinctrl->base0);
> +	}
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> +	pinctrl->base1 = devm_ioremap_resource(&pdev->dev, res);
> +	if (IS_ERR(pinctrl->base1)) {
> +		dev_err(&pdev->dev, "unable to map I/O space\n");
> +		return PTR_ERR(pinctrl->base1);
> +	}
> +
> +	ret = cygnus_mux_log_init(pinctrl);
> +	if (ret) {
> +		dev_err(&pdev->dev, "unable to initialize IOMUX log\n");
> +		return ret;
> +	}
> +
> +	pins = devm_kcalloc(&pdev->dev, num_pins, sizeof(*pins), GFP_KERNEL);
> +	if (!pins)
> +		return -ENOMEM;
> +
> +	for (i = 0; i < num_pins; i++) {
> +		pins[i].number = cygnus_pins[i].pin;
> +		pins[i].name = cygnus_pins[i].name;
> +		pins[i].drv_data = &cygnus_pins[i].gpio_mux;
> +	}
> +
> +	pinctrl->groups = cygnus_pin_groups;
> +	pinctrl->num_groups = ARRAY_SIZE(cygnus_pin_groups);
> +	pinctrl->functions = cygnus_pin_functions;
> +	pinctrl->num_functions = ARRAY_SIZE(cygnus_pin_functions);
> +	cygnus_pinctrl_desc.pins = pins;
> +	cygnus_pinctrl_desc.npins = num_pins;
> +
> +	pinctrl->pctl = pinctrl_register(&cygnus_pinctrl_desc, &pdev->dev,
> +			pinctrl);
> +	if (!pinctrl->pctl) {
> +		dev_err(&pdev->dev, "unable to register Cygnus IOMUX pinctrl\n");
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +static struct of_device_id cygnus_pinmux_of_match[] = {
> +	{ .compatible = "brcm,cygnus-pinmux" },
> +	{ }
> +};
> +
> +static struct platform_driver cygnus_pinmux_driver = {
> +	.driver = {
> +		.name = "cygnus-pinmux",
> +		.of_match_table = cygnus_pinmux_of_match,
> +	},
> +	.probe = cygnus_pinmux_probe,

You also need to either provide remove() method or disallow unbinding
via sysfs by setting suppress_bind_attrs in platform driver.

> +};
> +
> +static int __init cygnus_pinmux_init(void)
> +{
> +	return platform_driver_register(&cygnus_pinmux_driver);
> +}
> +arch_initcall(cygnus_pinmux_init);
> +
> +MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
> +MODULE_DESCRIPTION("Broadcom Cygnus IOMUX driver");
> +MODULE_LICENSE("GPL v2");
> -- 
> 1.7.9.5
> 

Thanks.

-- 
Dmitry

[PATCH v4 0/5] Add common clock support for Broadcom iProc architecture

[Ray Jui]

This patchset contains the initial common clock support for Broadcom's iProc
family of SoCs. The iProc clock architecture comprises of various PLLs, e.g.,
ARMPLL, GENPLL, LCPLL0, MIPIPLL, and etc. An onboard crystal serves as the
basic reference clock for these PLLs. Each PLL may have several leaf clocks.
One special group of clocks is the ASIU clocks, which are dervied directly
from the crystal reference clock.

This patchset also contains the basic clock support for the Broadcom Cygnus
SoC, which implements the iProc clock architecture

Changes from v3:
 - Fix incorrect use of passing in of_clk_src_onecell_get when adding ARM PLL
   and other iProc PLLs as clock provider. These PLLs have zero cells in DT and
   thefore of_clk_src_simple_get should be used instead
 - Rename Cygnus MIPI PLL Channel 2 clock from BCM_CYGNUS_MIPIPLL_CH2_UNUSED
   to BCM_CYGNUS_MIPIPLL_CH2_V3D, since a 3D graphic rendering engine has been
   integrated into Cygnus revision B0 and has its core clock running off
   MIPI PLL Channel 2
 - Changed default MIPI PLL VCO frequency from 1.75 GHz to 2.1 GHz. This allows
   us to derive 300 MHz V3D clock from channel 2 through the post divisor

Changes from v2:
 - Re-arrange Cygnus clock/pll init functions so each init function is right
   next to its clock table
 - Removed #defines for number of clocks in Cygnus. Have the number of clocks
   automatically determined based on array size of the clock table

Changes from v1:
 - Separate drivers/clk/Makefile change for drivers/clk/bcm out to a standalone patch

Ray Jui (5):
  clk: iproc: define Broadcom iProc clock binding
  clk: iproc: add initial common clock support
  clk: Change bcm clocks build dependency
  clk: cygnus: add clock support for Broadcom Cygnus
  ARM: dts: enable clock support for Broadcom Cygnus

 arch/arm/boot/dts/bcm-cygnus-clock.dtsi |  110 +++++--
 arch/arm/boot/dts/bcm-cygnus.dtsi       |    2 +-
 brcm,iproc-clocks.txt                   |  178 ++++++++++++
 drivers/clk/Makefile                    |    2 +-
 drivers/clk/bcm/Kconfig                 |    9 +
 drivers/clk/bcm/Makefile                |    2 +
 drivers/clk/bcm/clk-cygnus.c            |  277 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-armpll.c      |  282 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-asiu.c        |  275 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-clk.c         |  238 +++++++++++++++
 drivers/clk/bcm/clk-iproc-pll.c         |  478 +++++++++++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc.h             |  155 ++++++++++
 include/dt-bindings/clock/bcm-cygnus.h  |   65 +++++
 13 files changed, 2046 insertions(+), 27 deletions(-)
 create mode 100644 brcm,iproc-clocks.txt
 create mode 100644 drivers/clk/bcm/clk-cygnus.c
 create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
 create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
 create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
 create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
 create mode 100644 drivers/clk/bcm/clk-iproc.h
 create mode 100644 include/dt-bindings/clock/bcm-cygnus.h

-- 
1.7.9.5

[PATCH v4 0/5] Add common clock support for Broadcom iProc architecture

[Ray Jui]

This patchset contains the initial common clock support for Broadcom's iProc
family of SoCs. The iProc clock architecture comprises of various PLLs, e.g.,
ARMPLL, GENPLL, LCPLL0, MIPIPLL, and etc. An onboard crystal serves as the
basic reference clock for these PLLs. Each PLL may have several leaf clocks.
One special group of clocks is the ASIU clocks, which are dervied directly
from the crystal reference clock.

This patchset also contains the basic clock support for the Broadcom Cygnus
SoC, which implements the iProc clock architecture

Changes from v3:
 - Fix incorrect use of passing in of_clk_src_onecell_get when adding ARM PLL
   and other iProc PLLs as clock provider. These PLLs have zero cells in DT and
   thefore of_clk_src_simple_get should be used instead
 - Rename Cygnus MIPI PLL Channel 2 clock from BCM_CYGNUS_MIPIPLL_CH2_UNUSED
   to BCM_CYGNUS_MIPIPLL_CH2_V3D, since a 3D graphic rendering engine has been
   integrated into Cygnus revision B0 and has its core clock running off
   MIPI PLL Channel 2
 - Changed default MIPI PLL VCO frequency from 1.75 GHz to 2.1 GHz. This allows
   us to derive 300 MHz V3D clock from channel 2 through the post divisor

Changes from v2:
 - Re-arrange Cygnus clock/pll init functions so each init function is right
   next to its clock table
 - Removed #defines for number of clocks in Cygnus. Have the number of clocks
   automatically determined based on array size of the clock table

Changes from v1:
 - Separate drivers/clk/Makefile change for drivers/clk/bcm out to a standalone patch

Ray Jui (5):
  clk: iproc: define Broadcom iProc clock binding
  clk: iproc: add initial common clock support
  clk: Change bcm clocks build dependency
  clk: cygnus: add clock support for Broadcom Cygnus
  ARM: dts: enable clock support for Broadcom Cygnus

 arch/arm/boot/dts/bcm-cygnus-clock.dtsi |  110 +++++--
 arch/arm/boot/dts/bcm-cygnus.dtsi       |    2 +-
 brcm,iproc-clocks.txt                   |  178 ++++++++++++
 drivers/clk/Makefile                    |    2 +-
 drivers/clk/bcm/Kconfig                 |    9 +
 drivers/clk/bcm/Makefile                |    2 +
 drivers/clk/bcm/clk-cygnus.c            |  277 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-armpll.c      |  282 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-asiu.c        |  275 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-clk.c         |  238 +++++++++++++++
 drivers/clk/bcm/clk-iproc-pll.c         |  478 +++++++++++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc.h             |  155 ++++++++++
 include/dt-bindings/clock/bcm-cygnus.h  |   65 +++++
 13 files changed, 2046 insertions(+), 27 deletions(-)
 create mode 100644 brcm,iproc-clocks.txt
 create mode 100644 drivers/clk/bcm/clk-cygnus.c
 create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
 create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
 create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
 create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
 create mode 100644 drivers/clk/bcm/clk-iproc.h
 create mode 100644 include/dt-bindings/clock/bcm-cygnus.h

-- 
1.7.9.5

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[PATCH v4 0/5] Add common clock support for Broadcom iProc architecture

[Ray Jui]

This patchset contains the initial common clock support for Broadcom's iProc
family of SoCs. The iProc clock architecture comprises of various PLLs, e.g.,
ARMPLL, GENPLL, LCPLL0, MIPIPLL, and etc. An onboard crystal serves as the
basic reference clock for these PLLs. Each PLL may have several leaf clocks.
One special group of clocks is the ASIU clocks, which are dervied directly
from the crystal reference clock.

This patchset also contains the basic clock support for the Broadcom Cygnus
SoC, which implements the iProc clock architecture

Changes from v3:
 - Fix incorrect use of passing in of_clk_src_onecell_get when adding ARM PLL
   and other iProc PLLs as clock provider. These PLLs have zero cells in DT and
   thefore of_clk_src_simple_get should be used instead
 - Rename Cygnus MIPI PLL Channel 2 clock from BCM_CYGNUS_MIPIPLL_CH2_UNUSED
   to BCM_CYGNUS_MIPIPLL_CH2_V3D, since a 3D graphic rendering engine has been
   integrated into Cygnus revision B0 and has its core clock running off
   MIPI PLL Channel 2
 - Changed default MIPI PLL VCO frequency from 1.75 GHz to 2.1 GHz. This allows
   us to derive 300 MHz V3D clock from channel 2 through the post divisor

Changes from v2:
 - Re-arrange Cygnus clock/pll init functions so each init function is right
   next to its clock table
 - Removed #defines for number of clocks in Cygnus. Have the number of clocks
   automatically determined based on array size of the clock table

Changes from v1:
 - Separate drivers/clk/Makefile change for drivers/clk/bcm out to a standalone patch

Ray Jui (5):
  clk: iproc: define Broadcom iProc clock binding
  clk: iproc: add initial common clock support
  clk: Change bcm clocks build dependency
  clk: cygnus: add clock support for Broadcom Cygnus
  ARM: dts: enable clock support for Broadcom Cygnus

 arch/arm/boot/dts/bcm-cygnus-clock.dtsi |  110 +++++--
 arch/arm/boot/dts/bcm-cygnus.dtsi       |    2 +-
 brcm,iproc-clocks.txt                   |  178 ++++++++++++
 drivers/clk/Makefile                    |    2 +-
 drivers/clk/bcm/Kconfig                 |    9 +
 drivers/clk/bcm/Makefile                |    2 +
 drivers/clk/bcm/clk-cygnus.c            |  277 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-armpll.c      |  282 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-asiu.c        |  275 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-clk.c         |  238 +++++++++++++++
 drivers/clk/bcm/clk-iproc-pll.c         |  478 +++++++++++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc.h             |  155 ++++++++++
 include/dt-bindings/clock/bcm-cygnus.h  |   65 +++++
 13 files changed, 2046 insertions(+), 27 deletions(-)
 create mode 100644 brcm,iproc-clocks.txt
 create mode 100644 drivers/clk/bcm/clk-cygnus.c
 create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
 create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
 create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
 create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
 create mode 100644 drivers/clk/bcm/clk-iproc.h
 create mode 100644 include/dt-bindings/clock/bcm-cygnus.h

-- 
1.7.9.5

[PATCH v4 1/5] clk: iproc: define Broadcom iProc clock binding

[Ray Jui]

Document the device tree binding for Broadcom iProc architecture based
clock controller

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 brcm,iproc-clocks.txt |  178 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 178 insertions(+)
 create mode 100644 brcm,iproc-clocks.txt

diff --git a/brcm,iproc-clocks.txt b/brcm,iproc-clocks.txt
new file mode 100644
index 0000000..cc64fd2
--- /dev/null
+++ b/brcm,iproc-clocks.txt
@@ -0,0 +1,178 @@
+Broadcom iProc Family Clocks
+
+This binding uses the common clock binding:
+    Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+The iProc clock controller manages clocks that are common to the iProc family.
+An SoC from the iProc family may have several PPLs, e.g., ARMPLL, GENPLL,
+LCPLL0, MIPIPLL, and etc., all derived from an onboard crystal. Each PLL
+comprises of several leaf clocks
+
+Required properties for PLLs:
+- compatible:
+    Should have a value of the form "brcm,<soc>-<pll>". For example, GENPLL on
+Cygnus has a compatible string of "brcm,cygnus-genpll"
+
+- #clock-cells:
+    Must be <0>
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL
+
+- clocks:
+    The input parent clock phandle for the PLL. For all iProc PLLs, this is an
+onboard crystal with a fixed rate
+
+Optional Properties for PLLs:
+- clock-frequency:
+    PLL frequency in Hz. If specified, PLL will be configured to run at
+<clock-frequency> instead of the default frequency after chip reset, provided
+that <clock-frequency> and its parameters are defined in the SoC specific
+frequency parameter table
+
+Example:
+
+	osc: oscillator {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <25000000>;
+	};
+
+	genpll: genpll {
+		#clock-cells = <0>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
+	};
+
+Required properties for leaf clocks of a PLL:
+
+- compatible:
+    Should have a value of the form "brcm,<soc>-<pll>-clk". For example, leaf
+clocks derived from the GENPLL on Cygnus SoC have a compatible string of
+"brcm,cygnus-genpll-clk"
+
+- #clock-cells:
+    Have a value of <1> since there are more than 1 leaf clock of a
+given PLL
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL leaf clocks
+
+- clocks:
+    The input parent PLL phandle for the leaf clock
+
+- clock-output-names:
+    An ordered list of strings defining the names of the leaf clocks
+
+Example:
+
+	genpll: genpll {
+		#clock-cells = <0>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
+	};
+
+	genpll_clks: genpll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-genpll-clk";
+		reg = <0x0301d000 0x2c>;
+		clocks = <&genpll>;
+		clock-output-names = "axi21", "250mhz", "ihost_sys",
+			"enet_sw", "audio_125", "can";
+	};
+
+Required properties for ASIU clocks:
+
+ASIU clocks are a special case. These clocks are derived directly from the
+reference clock of the onboard crystal
+
+- compatible:
+    Should have a value of the form "brcm,<soc>-asiu-clk". For example, ASIU
+clocks for Cygnus have a compatible string of "brcm,cygnus-asiu-clk"
+
+- #clock-cells:
+    Have a value of <1> since there are more than 1 ASIU clocks
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for ASIU clocks
+
+- clocks:
+    The input parent clock phandle for the ASIU clock, i.e., the onboard
+crystal
+
+- clock-output-names:
+    An ordered list of strings defining the names of the ASIU clocks
+
+Example:
+
+	osc: oscillator {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <25000000>;
+	};
+
+	asiu_clks: asiu_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-asiu-clk";
+		reg = <0x0301d048 0xc>,
+			<0x180aa024 0x4>;
+		clocks = <&osc>;
+		clock-output-names = "keypad", "adc/touch", "pwm";
+	};
+
+Cygnus
+------
+PLL and leaf clock compatible strings for Cygnus are:
+    "brcm,cygnus-armpll"
+    "brcm,cygnus-genpll"
+    "brcm,cygnus-lcpll0"
+    "brcm,cygnus-mipipll"
+    "brcm,cygnus-genpll-clk"
+    "brcm,cygnus-lcpll0-clk"
+    "brcm,cygnus-mipipll-clk"
+    "brcm,cygnus-asiu-clk"
+
+The following table defines the set of PLL/clock index and ID for Cygnus.
+These clock IDs are defined in:
+    "include/dt-bindings/clock/bcm-cygnus.h"
+
+    Clock      Source           Index   ID
+    ---        -----            -----   ---------
+    crystal    N/A              N/A     N/A
+
+    armpll     crystal          N/A     N/A
+    genpll     crystal          N/A     N/A
+    lcpll0     crystal          N/A     N/A
+    mipipll    crystal          N/A     N/A
+
+    keypad     crystal (ASIU)   0       BCM_CYGNUS_ASIU_KEYPAD_CLK
+    adc/tsc    crystal (ASIU)   1       BCM_CYGNUS_ASIU_ADC_CLK
+    pwm        crystal (ASIU)   2       BCM_CYGNUS_ASIU_PWM_CLK
+
+    axi21      genpll           0       BCM_CYGNUS_GENPLL_AXI21_CLK
+    250mhz     genpll           1       BCM_CYGNUS_GENPLL_250MHZ_CLK
+    ihost_sys  genpll           2       BCM_CYGNUS_GENPLL_IHOST_SYS_CLK
+    enet_sw    genpll           3       BCM_CYGNUS_GENPLL_ENET_SW_CLK
+    audio_125  genpll           4       BCM_CYGNUS_GENPLL_AUDIO_125_CLK
+    can        genpll           5       BCM_CYGNUS_GENPLL_CAN_CLK
+
+    pcie_phy   lcpll0           0       BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK
+    ddr_phy    lcpll0           1       BCM_CYGNUS_LCPLL0_DDR_PHY_CLK
+    sdio       lcpll0           2       BCM_CYGNUS_LCPLL0_SDIO_CLK
+    usb_phy    lcpll0           3       BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK
+    smart_card lcpll0           4       BCM_CYGNUS_LCPLL0_SMART_CARD_CLK
+    ch5        lcpll0           5       BCM_CYGNUS_LCPLL0_CH5_UNUSED
+
+    ch0_unused mipipll          0       BCM_CYGNUS_MIPIPLL_CH0_UNUSED
+    ch1_lcd    mipipll          1       BCM_CYGNUS_MIPIPLL_CH1_LCD
+    ch2_unused mipipll          2       BCM_CYGNUS_MIPIPLL_CH2_UNUSED
+    ch3_unused mipipll          3       BCM_CYGNUS_MIPIPLL_CH3_UNUSED
+    ch4_unused mipipll          4       BCM_CYGNUS_MIPIPLL_CH4_UNUSED
+    ch5_unused mipipll          5       BCM_CYGNUS_MIPIPLL_CH5_UNUSED
-- 
1.7.9.5

[PATCH v4 1/5] clk: iproc: define Broadcom iProc clock binding

[Ray Jui]

Document the device tree binding for Broadcom iProc architecture based
clock controller

Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
---
 brcm,iproc-clocks.txt |  178 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 178 insertions(+)
 create mode 100644 brcm,iproc-clocks.txt

diff --git a/brcm,iproc-clocks.txt b/brcm,iproc-clocks.txt
new file mode 100644
index 0000000..cc64fd2
--- /dev/null
+++ b/brcm,iproc-clocks.txt
@@ -0,0 +1,178 @@
+Broadcom iProc Family Clocks
+
+This binding uses the common clock binding:
+    Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+The iProc clock controller manages clocks that are common to the iProc family.
+An SoC from the iProc family may have several PPLs, e.g., ARMPLL, GENPLL,
+LCPLL0, MIPIPLL, and etc., all derived from an onboard crystal. Each PLL
+comprises of several leaf clocks
+
+Required properties for PLLs:
+- compatible:
+    Should have a value of the form "brcm,<soc>-<pll>". For example, GENPLL on
+Cygnus has a compatible string of "brcm,cygnus-genpll"
+
+- #clock-cells:
+    Must be <0>
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL
+
+- clocks:
+    The input parent clock phandle for the PLL. For all iProc PLLs, this is an
+onboard crystal with a fixed rate
+
+Optional Properties for PLLs:
+- clock-frequency:
+    PLL frequency in Hz. If specified, PLL will be configured to run at
+<clock-frequency> instead of the default frequency after chip reset, provided
+that <clock-frequency> and its parameters are defined in the SoC specific
+frequency parameter table
+
+Example:
+
+	osc: oscillator {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <25000000>;
+	};
+
+	genpll: genpll {
+		#clock-cells = <0>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
+	};
+
+Required properties for leaf clocks of a PLL:
+
+- compatible:
+    Should have a value of the form "brcm,<soc>-<pll>-clk". For example, leaf
+clocks derived from the GENPLL on Cygnus SoC have a compatible string of
+"brcm,cygnus-genpll-clk"
+
+- #clock-cells:
+    Have a value of <1> since there are more than 1 leaf clock of a
+given PLL
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL leaf clocks
+
+- clocks:
+    The input parent PLL phandle for the leaf clock
+
+- clock-output-names:
+    An ordered list of strings defining the names of the leaf clocks
+
+Example:
+
+	genpll: genpll {
+		#clock-cells = <0>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
+	};
+
+	genpll_clks: genpll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-genpll-clk";
+		reg = <0x0301d000 0x2c>;
+		clocks = <&genpll>;
+		clock-output-names = "axi21", "250mhz", "ihost_sys",
+			"enet_sw", "audio_125", "can";
+	};
+
+Required properties for ASIU clocks:
+
+ASIU clocks are a special case. These clocks are derived directly from the
+reference clock of the onboard crystal
+
+- compatible:
+    Should have a value of the form "brcm,<soc>-asiu-clk". For example, ASIU
+clocks for Cygnus have a compatible string of "brcm,cygnus-asiu-clk"
+
+- #clock-cells:
+    Have a value of <1> since there are more than 1 ASIU clocks
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for ASIU clocks
+
+- clocks:
+    The input parent clock phandle for the ASIU clock, i.e., the onboard
+crystal
+
+- clock-output-names:
+    An ordered list of strings defining the names of the ASIU clocks
+
+Example:
+
+	osc: oscillator {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <25000000>;
+	};
+
+	asiu_clks: asiu_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-asiu-clk";
+		reg = <0x0301d048 0xc>,
+			<0x180aa024 0x4>;
+		clocks = <&osc>;
+		clock-output-names = "keypad", "adc/touch", "pwm";
+	};
+
+Cygnus
+------
+PLL and leaf clock compatible strings for Cygnus are:
+    "brcm,cygnus-armpll"
+    "brcm,cygnus-genpll"
+    "brcm,cygnus-lcpll0"
+    "brcm,cygnus-mipipll"
+    "brcm,cygnus-genpll-clk"
+    "brcm,cygnus-lcpll0-clk"
+    "brcm,cygnus-mipipll-clk"
+    "brcm,cygnus-asiu-clk"
+
+The following table defines the set of PLL/clock index and ID for Cygnus.
+These clock IDs are defined in:
+    "include/dt-bindings/clock/bcm-cygnus.h"
+
+    Clock      Source           Index   ID
+    ---        -----            -----   ---------
+    crystal    N/A              N/A     N/A
+
+    armpll     crystal          N/A     N/A
+    genpll     crystal          N/A     N/A
+    lcpll0     crystal          N/A     N/A
+    mipipll    crystal          N/A     N/A
+
+    keypad     crystal (ASIU)   0       BCM_CYGNUS_ASIU_KEYPAD_CLK
+    adc/tsc    crystal (ASIU)   1       BCM_CYGNUS_ASIU_ADC_CLK
+    pwm        crystal (ASIU)   2       BCM_CYGNUS_ASIU_PWM_CLK
+
+    axi21      genpll           0       BCM_CYGNUS_GENPLL_AXI21_CLK
+    250mhz     genpll           1       BCM_CYGNUS_GENPLL_250MHZ_CLK
+    ihost_sys  genpll           2       BCM_CYGNUS_GENPLL_IHOST_SYS_CLK
+    enet_sw    genpll           3       BCM_CYGNUS_GENPLL_ENET_SW_CLK
+    audio_125  genpll           4       BCM_CYGNUS_GENPLL_AUDIO_125_CLK
+    can        genpll           5       BCM_CYGNUS_GENPLL_CAN_CLK
+
+    pcie_phy   lcpll0           0       BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK
+    ddr_phy    lcpll0           1       BCM_CYGNUS_LCPLL0_DDR_PHY_CLK
+    sdio       lcpll0           2       BCM_CYGNUS_LCPLL0_SDIO_CLK
+    usb_phy    lcpll0           3       BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK
+    smart_card lcpll0           4       BCM_CYGNUS_LCPLL0_SMART_CARD_CLK
+    ch5        lcpll0           5       BCM_CYGNUS_LCPLL0_CH5_UNUSED
+
+    ch0_unused mipipll          0       BCM_CYGNUS_MIPIPLL_CH0_UNUSED
+    ch1_lcd    mipipll          1       BCM_CYGNUS_MIPIPLL_CH1_LCD
+    ch2_unused mipipll          2       BCM_CYGNUS_MIPIPLL_CH2_UNUSED
+    ch3_unused mipipll          3       BCM_CYGNUS_MIPIPLL_CH3_UNUSED
+    ch4_unused mipipll          4       BCM_CYGNUS_MIPIPLL_CH4_UNUSED
+    ch5_unused mipipll          5       BCM_CYGNUS_MIPIPLL_CH5_UNUSED
-- 
1.7.9.5

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[PATCH v4 1/5] clk: iproc: define Broadcom iProc clock binding

[Ray Jui]

Document the device tree binding for Broadcom iProc architecture based
clock controller

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 brcm,iproc-clocks.txt |  178 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 178 insertions(+)
 create mode 100644 brcm,iproc-clocks.txt

diff --git a/brcm,iproc-clocks.txt b/brcm,iproc-clocks.txt
new file mode 100644
index 0000000..cc64fd2
--- /dev/null
+++ b/brcm,iproc-clocks.txt
@@ -0,0 +1,178 @@
+Broadcom iProc Family Clocks
+
+This binding uses the common clock binding:
+    Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+The iProc clock controller manages clocks that are common to the iProc family.
+An SoC from the iProc family may have several PPLs, e.g., ARMPLL, GENPLL,
+LCPLL0, MIPIPLL, and etc., all derived from an onboard crystal. Each PLL
+comprises of several leaf clocks
+
+Required properties for PLLs:
+- compatible:
+    Should have a value of the form "brcm,<soc>-<pll>". For example, GENPLL on
+Cygnus has a compatible string of "brcm,cygnus-genpll"
+
+- #clock-cells:
+    Must be <0>
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL
+
+- clocks:
+    The input parent clock phandle for the PLL. For all iProc PLLs, this is an
+onboard crystal with a fixed rate
+
+Optional Properties for PLLs:
+- clock-frequency:
+    PLL frequency in Hz. If specified, PLL will be configured to run at
+<clock-frequency> instead of the default frequency after chip reset, provided
+that <clock-frequency> and its parameters are defined in the SoC specific
+frequency parameter table
+
+Example:
+
+	osc: oscillator {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <25000000>;
+	};
+
+	genpll: genpll {
+		#clock-cells = <0>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
+	};
+
+Required properties for leaf clocks of a PLL:
+
+- compatible:
+    Should have a value of the form "brcm,<soc>-<pll>-clk". For example, leaf
+clocks derived from the GENPLL on Cygnus SoC have a compatible string of
+"brcm,cygnus-genpll-clk"
+
+- #clock-cells:
+    Have a value of <1> since there are more than 1 leaf clock of a
+given PLL
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL leaf clocks
+
+- clocks:
+    The input parent PLL phandle for the leaf clock
+
+- clock-output-names:
+    An ordered list of strings defining the names of the leaf clocks
+
+Example:
+
+	genpll: genpll {
+		#clock-cells = <0>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
+	};
+
+	genpll_clks: genpll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-genpll-clk";
+		reg = <0x0301d000 0x2c>;
+		clocks = <&genpll>;
+		clock-output-names = "axi21", "250mhz", "ihost_sys",
+			"enet_sw", "audio_125", "can";
+	};
+
+Required properties for ASIU clocks:
+
+ASIU clocks are a special case. These clocks are derived directly from the
+reference clock of the onboard crystal
+
+- compatible:
+    Should have a value of the form "brcm,<soc>-asiu-clk". For example, ASIU
+clocks for Cygnus have a compatible string of "brcm,cygnus-asiu-clk"
+
+- #clock-cells:
+    Have a value of <1> since there are more than 1 ASIU clocks
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for ASIU clocks
+
+- clocks:
+    The input parent clock phandle for the ASIU clock, i.e., the onboard
+crystal
+
+- clock-output-names:
+    An ordered list of strings defining the names of the ASIU clocks
+
+Example:
+
+	osc: oscillator {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <25000000>;
+	};
+
+	asiu_clks: asiu_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-asiu-clk";
+		reg = <0x0301d048 0xc>,
+			<0x180aa024 0x4>;
+		clocks = <&osc>;
+		clock-output-names = "keypad", "adc/touch", "pwm";
+	};
+
+Cygnus
+------
+PLL and leaf clock compatible strings for Cygnus are:
+    "brcm,cygnus-armpll"
+    "brcm,cygnus-genpll"
+    "brcm,cygnus-lcpll0"
+    "brcm,cygnus-mipipll"
+    "brcm,cygnus-genpll-clk"
+    "brcm,cygnus-lcpll0-clk"
+    "brcm,cygnus-mipipll-clk"
+    "brcm,cygnus-asiu-clk"
+
+The following table defines the set of PLL/clock index and ID for Cygnus.
+These clock IDs are defined in:
+    "include/dt-bindings/clock/bcm-cygnus.h"
+
+    Clock      Source           Index   ID
+    ---        -----            -----   ---------
+    crystal    N/A              N/A     N/A
+
+    armpll     crystal          N/A     N/A
+    genpll     crystal          N/A     N/A
+    lcpll0     crystal          N/A     N/A
+    mipipll    crystal          N/A     N/A
+
+    keypad     crystal (ASIU)   0       BCM_CYGNUS_ASIU_KEYPAD_CLK
+    adc/tsc    crystal (ASIU)   1       BCM_CYGNUS_ASIU_ADC_CLK
+    pwm        crystal (ASIU)   2       BCM_CYGNUS_ASIU_PWM_CLK
+
+    axi21      genpll           0       BCM_CYGNUS_GENPLL_AXI21_CLK
+    250mhz     genpll           1       BCM_CYGNUS_GENPLL_250MHZ_CLK
+    ihost_sys  genpll           2       BCM_CYGNUS_GENPLL_IHOST_SYS_CLK
+    enet_sw    genpll           3       BCM_CYGNUS_GENPLL_ENET_SW_CLK
+    audio_125  genpll           4       BCM_CYGNUS_GENPLL_AUDIO_125_CLK
+    can        genpll           5       BCM_CYGNUS_GENPLL_CAN_CLK
+
+    pcie_phy   lcpll0           0       BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK
+    ddr_phy    lcpll0           1       BCM_CYGNUS_LCPLL0_DDR_PHY_CLK
+    sdio       lcpll0           2       BCM_CYGNUS_LCPLL0_SDIO_CLK
+    usb_phy    lcpll0           3       BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK
+    smart_card lcpll0           4       BCM_CYGNUS_LCPLL0_SMART_CARD_CLK
+    ch5        lcpll0           5       BCM_CYGNUS_LCPLL0_CH5_UNUSED
+
+    ch0_unused mipipll          0       BCM_CYGNUS_MIPIPLL_CH0_UNUSED
+    ch1_lcd    mipipll          1       BCM_CYGNUS_MIPIPLL_CH1_LCD
+    ch2_unused mipipll          2       BCM_CYGNUS_MIPIPLL_CH2_UNUSED
+    ch3_unused mipipll          3       BCM_CYGNUS_MIPIPLL_CH3_UNUSED
+    ch4_unused mipipll          4       BCM_CYGNUS_MIPIPLL_CH4_UNUSED
+    ch5_unused mipipll          5       BCM_CYGNUS_MIPIPLL_CH5_UNUSED
-- 
1.7.9.5

[PATCH v4 2/5] clk: iproc: add initial common clock support

[Ray Jui]

This adds basic and generic support for various iProc PLLs and clocks
including the ARMPLL, GENPLL, LCPLL, MIPIPLL, and ASIU clocks.

SoCs under the iProc architecture can define their specific register
offsets and clock parameters for their PLL and clock controllers. These
parameters can be passed as arugments into the generic iProc PLL and
clock setup functions

Derived from code originally provided by Jonathan Richardson
<jonathar@broadcom.com>

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/clk/bcm/Kconfig            |    9 +
 drivers/clk/bcm/Makefile           |    1 +
 drivers/clk/bcm/clk-iproc-armpll.c |  282 +++++++++++++++++++++
 drivers/clk/bcm/clk-iproc-asiu.c   |  275 +++++++++++++++++++++
 drivers/clk/bcm/clk-iproc-clk.c    |  238 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-pll.c    |  478 ++++++++++++++++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc.h        |  155 ++++++++++++
 7 files changed, 1438 insertions(+)
 create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
 create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
 create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
 create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
 create mode 100644 drivers/clk/bcm/clk-iproc.h

diff --git a/drivers/clk/bcm/Kconfig b/drivers/clk/bcm/Kconfig
index 75506e5..66b5b7f 100644
--- a/drivers/clk/bcm/Kconfig
+++ b/drivers/clk/bcm/Kconfig
@@ -7,3 +7,12 @@ config CLK_BCM_KONA
 	  Enable common clock framework support for Broadcom SoCs
 	  using "Kona" style clock control units, including those
 	  in the BCM281xx and BCM21664 families.
+
+config COMMON_CLK_IPROC
+	bool "Broadcom iProc clock support"
+	depends on ARCH_BCM_IPROC
+	depends on COMMON_CLK
+	default y
+	help
+	  Enable common clock framework support for Broadcom SoCs
+	  based on the "iProc" architecture
diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
index 6297d05..6926636 100644
--- a/drivers/clk/bcm/Makefile
+++ b/drivers/clk/bcm/Makefile
@@ -2,3 +2,4 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
+obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
diff --git a/drivers/clk/bcm/clk-iproc-armpll.c b/drivers/clk/bcm/clk-iproc-armpll.c
new file mode 100644
index 0000000..965cd4e
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-armpll.c
@@ -0,0 +1,282 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+
+#define IPROC_CLK_MAX_FREQ_POLICY                    0x3
+#define IPROC_CLK_POLICY_FREQ_OFFSET                 0x008
+#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT      8
+#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK       0x7
+
+#define IPROC_CLK_PLLARMA_OFFSET                     0xc00
+#define IPROC_CLK_PLLARMA_LOCK_SHIFT                 28
+#define IPROC_CLK_PLLARMA_PDIV_SHIFT                 24
+#define IPROC_CLK_PLLARMA_PDIV_MASK                  0xf
+#define IPROC_CLK_PLLARMA_NDIV_INT_SHIFT             8
+#define IPROC_CLK_PLLARMA_NDIV_INT_MASK              0x3ff
+
+#define IPROC_CLK_PLLARMB_OFFSET                     0xc04
+#define IPROC_CLK_PLLARMB_NDIV_FRAC_MASK             0xfffff
+
+#define IPROC_CLK_PLLARMC_OFFSET                     0xc08
+#define IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT            8
+#define IPROC_CLK_PLLARMC_MDIV_MASK                  0xff
+
+#define IPROC_CLK_PLLARMCTL5_OFFSET                  0xc20
+#define IPROC_CLK_PLLARMCTL5_H_MDIV_MASK             0xff
+
+#define IPROC_CLK_PLLARM_OFFSET_OFFSET               0xc24
+#define IPROC_CLK_PLLARM_SW_CTL_SHIFT                29
+#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT       20
+#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK        0xff
+#define IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK       0xfffff
+
+#define IPROC_CLK_ARM_DIV_OFFSET                     0xe00
+#define IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT  4
+#define IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK        0xf
+
+#define IPROC_CLK_POLICY_DBG_OFFSET                  0xec0
+#define IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT          12
+#define IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK           0x7
+
+enum iproc_arm_pll_fid {
+	ARM_PLL_FID_CRYSTAL_CLK   = 0,
+	ARM_PLL_FID_SYS_CLK       = 2,
+	ARM_PLL_FID_CH0_SLOW_CLK  = 6,
+	ARM_PLL_FID_CH1_FAST_CLK  = 7
+};
+
+struct iproc_arm_pll {
+	struct clk_hw hw;
+	void __iomem *base;
+	unsigned long rate;
+};
+
+#define to_iproc_arm_pll(hw) container_of(hw, struct iproc_arm_pll, hw)
+
+static unsigned int __get_fid(struct iproc_arm_pll *pll)
+{
+	u32 val;
+	unsigned int policy, fid, active_fid;
+
+	val = readl(pll->base + IPROC_CLK_ARM_DIV_OFFSET);
+	if (val & (1 << IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT))
+		policy = val & IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK;
+	else
+		policy = 0;
+
+	/* something is seriously wrong */
+	BUG_ON(policy > IPROC_CLK_MAX_FREQ_POLICY);
+
+	val = readl(pll->base + IPROC_CLK_POLICY_FREQ_OFFSET);
+	fid = (val >> (IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT * policy)) &
+		IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK;
+
+	val = readl(pll->base + IPROC_CLK_POLICY_DBG_OFFSET);
+	active_fid = IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK &
+		(val >> IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT);
+	if (fid != active_fid) {
+		pr_debug("%s: fid override %u->%u\n", __func__,	fid,
+				active_fid);
+		fid = active_fid;
+	}
+
+	pr_debug("%s: active fid: %u\n", __func__, fid);
+
+	return fid;
+}
+
+/*
+ * Determine the mdiv (post divider) based on the frequency ID being used.
+ * There are 4 sources that can be used to derive the output clock rate:
+ *    - 25 MHz Crystal
+ *    - System clock
+ *    - PLL channel 0 (slow clock)
+ *    - PLL channel 1 (fast clock)
+ */
+static int __get_mdiv(struct iproc_arm_pll *pll)
+{
+	unsigned int fid;
+	int mdiv;
+	u32 val;
+
+	fid = __get_fid(pll);
+
+	switch (fid) {
+	case ARM_PLL_FID_CRYSTAL_CLK:
+	case ARM_PLL_FID_SYS_CLK:
+		mdiv = 1;
+		break;
+
+	case ARM_PLL_FID_CH0_SLOW_CLK:
+		val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
+		mdiv = val & IPROC_CLK_PLLARMC_MDIV_MASK;
+		if (mdiv == 0)
+			mdiv = 256;
+		break;
+
+	case ARM_PLL_FID_CH1_FAST_CLK:
+		val = readl(pll->base +	IPROC_CLK_PLLARMCTL5_OFFSET);
+		mdiv = val & IPROC_CLK_PLLARMCTL5_H_MDIV_MASK;
+		if (mdiv == 0)
+			mdiv = 256;
+		break;
+
+	default:
+		mdiv = -EFAULT;
+	}
+
+	return mdiv;
+}
+
+static unsigned int __get_ndiv(struct iproc_arm_pll *pll)
+{
+	u32 val;
+	unsigned int ndiv_int, ndiv_frac, ndiv;
+
+	val = readl(pll->base + IPROC_CLK_PLLARM_OFFSET_OFFSET);
+	if (val & (1 << IPROC_CLK_PLLARM_SW_CTL_SHIFT)) {
+		/*
+		 * offset mode is active. Read the ndiv from the PLLARM OFFSET
+		 * register
+		 */
+		ndiv_int = (val >> IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT) &
+			IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK;
+		if (ndiv_int == 0)
+			ndiv_int = 256;
+
+		ndiv_frac = val & IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK;
+	} else {
+		/* offset mode not active */
+		val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
+		ndiv_int = (val >> IPROC_CLK_PLLARMA_NDIV_INT_SHIFT) &
+			IPROC_CLK_PLLARMA_NDIV_INT_MASK;
+		if (ndiv_int == 0)
+			ndiv_int = 1024;
+
+		val = readl(pll->base + IPROC_CLK_PLLARMB_OFFSET);
+		ndiv_frac = val & IPROC_CLK_PLLARMB_NDIV_FRAC_MASK;
+	}
+
+	ndiv = (ndiv_int << 20) | ndiv_frac;
+
+	return ndiv;
+}
+
+/*
+ * The output frequency of the ARM PLL is calculated based on the ARM PLL
+ * divider values:
+ *   pdiv = ARM PLL pre-divider
+ *   ndiv = ARM PLL multiplier
+ *   mdiv = ARM PLL post divider
+ *
+ * The frequency is calculated by:
+ *   ((ndiv * parent clock rate) / pdiv) / mdiv
+ */
+static unsigned long iproc_arm_pll_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_arm_pll *pll = to_iproc_arm_pll(hw);
+	u32 val;
+	int mdiv;
+	u64 ndiv;
+	unsigned int pdiv;
+
+	/* in bypass mode, use parent rate */
+	val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
+	if (val & (1 << IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT)) {
+		pll->rate = parent_rate;
+		return pll->rate;
+	}
+
+	/* PLL needs to be locked */
+	val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
+	if (!(val & (1 << IPROC_CLK_PLLARMA_LOCK_SHIFT))) {
+		pll->rate = 0;
+		return 0;
+	}
+
+	pdiv = (val >> IPROC_CLK_PLLARMA_PDIV_SHIFT) &
+		IPROC_CLK_PLLARMA_PDIV_MASK;
+	if (pdiv == 0)
+		pdiv = 16;
+
+	ndiv = __get_ndiv(pll);
+	mdiv = __get_mdiv(pll);
+	if (mdiv <= 0) {
+		pll->rate = 0;
+		return 0;
+	}
+	pll->rate = (ndiv * parent_rate) >> 20;
+	pll->rate = (pll->rate / pdiv) / mdiv;
+
+	pr_debug("%s: ARM PLL rate: %lu. parent rate: %lu\n", __func__,
+			pll->rate, parent_rate);
+	pr_debug("%s: ndiv_int: %u, pdiv: %u, mdiv: %d\n", __func__,
+			(unsigned int)(ndiv >> 20), pdiv, mdiv);
+
+	return pll->rate;
+}
+
+static const struct clk_ops iproc_arm_pll_ops = {
+	.recalc_rate = iproc_arm_pll_recalc_rate,
+};
+
+void __init iproc_armpll_setup(struct device_node *node)
+{
+	int ret;
+	struct clk *clk;
+	struct iproc_arm_pll *pll;
+	struct clk_init_data init;
+	const char *parent_name;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->base = of_iomap(node, 0);
+	if (WARN_ON(!pll->base))
+		goto err_free_pll;
+
+	init.name = node->name;
+	init.ops = &iproc_arm_pll_ops;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	pll->hw.init = &init;
+
+	clk = clk_register(NULL, &pll->hw);
+	if (WARN_ON(IS_ERR(clk)))
+		goto err_iounmap;
+
+	ret = of_clk_add_provider(node, of_clk_src_simple_get, clk);
+	if (WARN_ON(ret))
+		goto err_clk_unregister;
+
+	return;
+
+err_clk_unregister:
+	clk_unregister(clk);
+err_iounmap:
+	iounmap(pll->base);
+err_free_pll:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc-asiu.c b/drivers/clk/bcm/clk-iproc-asiu.c
new file mode 100644
index 0000000..ab86b8c
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-asiu.c
@@ -0,0 +1,275 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+struct iproc_asiu;
+
+struct iproc_asiu_clk {
+	struct clk_hw hw;
+	const char *name;
+	struct iproc_asiu *asiu;
+	unsigned long rate;
+	struct iproc_asiu_div div;
+	struct iproc_asiu_gate gate;
+};
+
+struct iproc_asiu {
+	void __iomem *div_base;
+	void __iomem *gate_base;
+
+	struct clk_onecell_data clk_data;
+	struct iproc_asiu_clk *clks;
+};
+
+#define to_asiu_clk(hw) container_of(hw, struct iproc_asiu_clk, hw)
+
+static int iproc_asiu_clk_enable(struct clk_hw *hw)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+
+	/* some clocks at the ASIU level are always enabled */
+	if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
+		return 0;
+
+	val = readl(asiu->gate_base + clk->gate.offset);
+	val |= (1 << clk->gate.en_shift);
+	writel(val, asiu->gate_base + clk->gate.offset);
+
+	return 0;
+}
+
+static void iproc_asiu_clk_disable(struct clk_hw *hw)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+
+	/* some clocks at the ASIU level are always enabled */
+	if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
+		return;
+
+	val = readl(asiu->gate_base + clk->gate.offset);
+	val &= ~(1 << clk->gate.en_shift);
+	writel(val, asiu->gate_base + clk->gate.offset);
+}
+
+static unsigned long iproc_asiu_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+	unsigned int div_h, div_l;
+
+	if (parent_rate == 0) {
+		clk->rate = 0;
+		return 0;
+	}
+
+	/* if clock divisor is not enabled, simply return parent rate */
+	val = readl(asiu->div_base + clk->div.offset);
+	if ((val & (1 << clk->div.en_shift)) == 0) {
+		clk->rate = parent_rate;
+		return parent_rate;
+	}
+
+	/* clock rate = parent rate / (high_div + 1) + (low_div + 1) */
+	div_h = (val >> clk->div.high_shift) & bit_mask(clk->div.high_width);
+	div_h++;
+	div_l = (val >> clk->div.low_shift) & bit_mask(clk->div.low_width);
+	div_l++;
+
+	clk->rate = parent_rate / (div_h + div_l);
+	pr_debug("%s: rate: %lu. parent rate: %lu div_h: %u div_l: %u\n",
+		__func__, clk->rate, parent_rate, div_h, div_l);
+
+	return clk->rate;
+}
+
+static long iproc_asiu_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	unsigned int div;
+
+	if (rate == 0 || *parent_rate == 0)
+		return -EINVAL;
+
+	if (rate == *parent_rate)
+		return *parent_rate;
+
+	div = DIV_ROUND_UP(*parent_rate, rate);
+	if (div < 2)
+		return *parent_rate;
+
+	return *parent_rate / div;
+}
+
+static int iproc_asiu_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	unsigned int div, div_h, div_l;
+	u32 val;
+
+	if (rate == 0 || parent_rate == 0)
+		return -EINVAL;
+
+	/* simply disable the divisor if one wants the same rate as parent */
+	if (rate == parent_rate) {
+		val = readl(asiu->div_base + clk->div.offset);
+		val &= ~(1 << clk->div.en_shift);
+		writel(val, asiu->div_base + clk->div.offset);
+		return 0;
+	}
+
+	div = DIV_ROUND_UP(parent_rate, rate);
+	if (div < 2)
+		return -EINVAL;
+
+	div_h = div_l = div >> 1;
+	div_h--;
+	div_l--;
+
+	val = readl(asiu->div_base + clk->div.offset);
+	val |= 1 << clk->div.en_shift;
+	if (div_h) {
+		val &= ~(bit_mask(clk->div.high_width)
+				<< clk->div.high_shift);
+		val |= div_h << clk->div.high_shift;
+	} else {
+		val &= ~(bit_mask(clk->div.high_width)
+				<< clk->div.high_shift);
+	}
+	if (div_l) {
+		val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
+		val |= div_l << clk->div.low_shift;
+	} else {
+		val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
+	}
+	writel(val, asiu->div_base + clk->div.offset);
+
+	return 0;
+}
+
+static const struct clk_ops iproc_asiu_ops = {
+	.enable = iproc_asiu_clk_enable,
+	.disable = iproc_asiu_clk_disable,
+	.recalc_rate = iproc_asiu_clk_recalc_rate,
+	.round_rate = iproc_asiu_clk_round_rate,
+	.set_rate = iproc_asiu_clk_set_rate,
+};
+
+void __init iproc_asiu_setup(struct device_node *node,
+		const struct iproc_asiu_div *div,
+		const struct iproc_asiu_gate *gate, unsigned int num_clks)
+{
+	int i, ret;
+	struct iproc_asiu *asiu;
+
+	if (WARN_ON(!gate || !div))
+		return;
+
+	asiu = kzalloc(sizeof(*asiu), GFP_KERNEL);
+	if (WARN_ON(!asiu))
+		return;
+
+	asiu->clk_data.clk_num = num_clks;
+	asiu->clk_data.clks = kcalloc(num_clks, sizeof(*asiu->clk_data.clks),
+			GFP_KERNEL);
+	if (WARN_ON(!asiu->clk_data.clks))
+		goto err_clks;
+
+	asiu->clks = kcalloc(num_clks, sizeof(*asiu->clks), GFP_KERNEL);
+	if (WARN_ON(!asiu->clks))
+		goto err_asiu_clks;
+
+	asiu->div_base = of_iomap(node, 0);
+	if (WARN_ON(!asiu->div_base))
+		goto err_iomap_div;
+
+	asiu->gate_base = of_iomap(node, 1);
+	if (WARN_ON(!asiu->gate_base))
+		goto err_iomap_gate;
+
+	for (i = 0; i < num_clks; i++) {
+		struct clk_init_data init;
+		struct clk *clk;
+		const char *parent_name;
+		struct iproc_asiu_clk *asiu_clk;
+		const char *clk_name;
+
+		clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
+		if (WARN_ON(!clk_name))
+			goto err_clk_register;
+
+		ret = of_property_read_string_index(node, "clock-output-names",
+				i, &clk_name);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+
+		asiu_clk = &asiu->clks[i];
+		asiu_clk->name = clk_name;
+		asiu_clk->asiu = asiu;
+		asiu_clk->div = div[i];
+		asiu_clk->gate = gate[i];
+		init.name = clk_name;
+		init.ops = &iproc_asiu_ops;
+		init.flags = 0;
+		parent_name = of_clk_get_parent_name(node, 0);
+		init.parent_names = (parent_name ? &parent_name : NULL);
+		init.num_parents = (parent_name ? 1 : 0);
+		asiu_clk->hw.init = &init;
+
+		clk = clk_register(NULL, &asiu_clk->hw);
+		if (WARN_ON(IS_ERR(clk)))
+			goto err_clk_register;
+		asiu->clk_data.clks[i] = clk;
+	}
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get,
+			&asiu->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_register;
+
+	return;
+
+err_clk_register:
+	for (i = 0; i < num_clks; i++)
+		kfree(asiu->clks[i].name);
+	iounmap(asiu->gate_base);
+
+err_iomap_gate:
+	iounmap(asiu->div_base);
+
+err_iomap_div:
+	kfree(asiu->clks);
+
+err_asiu_clks:
+	kfree(asiu->clk_data.clks);
+
+err_clks:
+	kfree(asiu);
+}
diff --git a/drivers/clk/bcm/clk-iproc-clk.c b/drivers/clk/bcm/clk-iproc-clk.c
new file mode 100644
index 0000000..be3c42c
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-clk.c
@@ -0,0 +1,238 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+struct iproc_pll;
+
+struct iproc_clk {
+	struct clk_hw hw;
+	const char *name;
+	struct iproc_pll *pll;
+	unsigned long rate;
+	const struct iproc_clk_ctrl *ctrl;
+};
+
+struct iproc_pll {
+	void __iomem *base;
+	struct clk_onecell_data clk_data;
+	struct iproc_clk *clks;
+};
+
+#define to_iproc_clk(hw) container_of(hw, struct iproc_clk, hw)
+
+static int iproc_clk_enable(struct clk_hw *hw)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+
+	/* channel enable is active low */
+	val = readl(pll->base + ctrl->enable.offset);
+	val &= ~(1 << ctrl->enable.enable_shift);
+	writel(val, pll->base + ctrl->enable.offset);
+
+	/* also make sure channel is not held */
+	val = readl(pll->base + ctrl->enable.offset);
+	val &= ~(1 << ctrl->enable.hold_shift);
+	writel(val, pll->base + ctrl->enable.offset);
+
+	return 0;
+}
+
+static void iproc_clk_disable(struct clk_hw *hw)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+
+	if (ctrl->flags & IPROC_CLK_AON)
+		return;
+
+	val = readl(pll->base + ctrl->enable.offset);
+	val |= 1 << ctrl->enable.enable_shift;
+	writel(val, pll->base + ctrl->enable.offset);
+}
+
+static unsigned long iproc_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+	unsigned int mdiv;
+
+	if (parent_rate == 0)
+		return 0;
+
+	val = readl(pll->base + ctrl->mdiv.offset);
+	mdiv = (val >> ctrl->mdiv.shift) & bit_mask(ctrl->mdiv.width);
+	if (mdiv == 0)
+		mdiv = 256;
+
+	clk->rate = parent_rate / mdiv;
+
+	return clk->rate;
+}
+
+static long iproc_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	unsigned int div;
+
+	if (rate == 0 || *parent_rate == 0)
+		return -EINVAL;
+
+	if (rate == *parent_rate)
+		return *parent_rate;
+
+	div = DIV_ROUND_UP(*parent_rate, rate);
+	if (div < 2)
+		return *parent_rate;
+
+	if (div > 256)
+		div = 256;
+
+	return *parent_rate / div;
+}
+
+static int iproc_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+	unsigned int div;
+
+	if (rate == 0 || parent_rate == 0)
+		return -EINVAL;
+
+	div = DIV_ROUND_UP(parent_rate, rate);
+	if (div > 256)
+		return -EINVAL;
+
+	val = readl(pll->base + ctrl->mdiv.offset);
+	if (div == 256) {
+		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
+	} else {
+		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
+		val |= div << ctrl->mdiv.shift;
+	}
+	writel(val, pll->base + ctrl->mdiv.offset);
+	clk->rate = parent_rate / div;
+
+	return 0;
+}
+
+static const struct clk_ops iproc_clk_ops = {
+	.enable = iproc_clk_enable,
+	.disable = iproc_clk_disable,
+	.recalc_rate = iproc_clk_recalc_rate,
+	.round_rate = iproc_clk_round_rate,
+	.set_rate = iproc_clk_set_rate,
+};
+
+void __init iproc_clk_setup(struct device_node *node,
+		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks)
+{
+	int i, ret;
+	struct iproc_pll *pll;
+
+	if (WARN_ON(!ctrl))
+		return;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->clk_data.clk_num = num_clks;
+	pll->clk_data.clks = kcalloc(num_clks, sizeof(*pll->clk_data.clks),
+			GFP_KERNEL);
+	if (WARN_ON(!pll->clk_data.clks))
+		goto err_clks;
+
+	pll->clks = kcalloc(num_clks, sizeof(*pll->clks), GFP_KERNEL);
+	if (WARN_ON(!pll->clks))
+		goto err_pll_clks;
+
+	pll->base = of_iomap(node, 0);
+	if (WARN_ON(!pll->base))
+		goto err_iomap;
+
+	for (i = 0; i < num_clks; i++) {
+		struct clk_init_data init;
+		struct clk *clk;
+		const char *parent_name;
+		struct iproc_clk *iclk;
+		const char *clk_name;
+
+		clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
+		if (WARN_ON(!clk_name))
+			goto err_clk_register;
+
+		ret = of_property_read_string_index(node, "clock-output-names",
+				i, &clk_name);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+
+		iclk = &pll->clks[i];
+		iclk->name = clk_name;
+		iclk->pll = pll;
+		iclk->ctrl = &ctrl[i];
+		init.name = clk_name;
+		init.ops = &iproc_clk_ops;
+		init.flags = 0;
+		parent_name = of_clk_get_parent_name(node, 0);
+		init.parent_names = (parent_name ? &parent_name : NULL);
+		init.num_parents = (parent_name ? 1 : 0);
+		iclk->hw.init = &init;
+
+		clk = clk_register(NULL, &iclk->hw);
+		if (WARN_ON(IS_ERR(clk)))
+			goto err_clk_register;
+		pll->clk_data.clks[i] = clk;
+	}
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_register;
+
+	return;
+
+err_clk_register:
+	for (i = 0; i < num_clks; i++)
+		kfree(pll->clks[i].name);
+	iounmap(pll->base);
+
+err_iomap:
+	kfree(pll->clks);
+
+err_pll_clks:
+	kfree(pll->clk_data.clks);
+
+err_clks:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc-pll.c b/drivers/clk/bcm/clk-iproc-pll.c
new file mode 100644
index 0000000..a4d98b6
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-pll.c
@@ -0,0 +1,478 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+#define PLL_VCO_HIGH_SHIFT 19
+#define PLL_VCO_LOW_SHIFT  30
+
+/* number of delay loops waiting for PLL to lock */
+#define LOCK_DELAY 100
+
+/* number of VCO frequency bands */
+#define NUM_FREQ_BANDS 8
+
+#define NUM_KP_BANDS 3
+enum kp_band {
+	KP_BAND_MID = 0,
+	KP_BAND_HIGH,
+	KP_BAND_HIGH_HIGH
+};
+
+static const unsigned int kp_table[NUM_KP_BANDS][NUM_FREQ_BANDS] = {
+	{ 5, 6, 6, 7, 7, 8, 9, 10 },
+	{ 4, 4, 5, 5, 6, 7, 8, 9  },
+	{ 4, 5, 5, 6, 7, 8, 9, 10 },
+};
+
+static const unsigned long ref_freq_table[NUM_FREQ_BANDS][2] = {
+	{ 10000000,  12500000  },
+	{ 12500000,  15000000  },
+	{ 15000000,  20000000  },
+	{ 20000000,  25000000  },
+	{ 25000000,  50000000  },
+	{ 50000000,  75000000  },
+	{ 75000000,  100000000 },
+	{ 100000000, 125000000 },
+};
+
+enum vco_freq_range {
+	VCO_LOW       = 700000000U,
+	VCO_MID       = 1200000000U,
+	VCO_HIGH      = 2200000000U,
+	VCO_HIGH_HIGH = 3100000000U,
+	VCO_MAX       = 4000000000U,
+};
+
+struct iproc_pll {
+	struct clk_hw hw;
+	void __iomem *pll_base;
+	void __iomem *pwr_base;
+	void __iomem *asiu_base;
+	const char *name;
+	const struct iproc_pll_ctrl *ctrl;
+	const struct iproc_pll_vco_freq_param *vco_param;
+	unsigned int num_vco_entries;
+	unsigned long rate;
+};
+
+#define to_iproc_pll(hw) container_of(hw, struct iproc_pll, hw)
+
+/*
+ * Get the clock rate based on name
+ */
+static unsigned long __get_rate(const char *clk_name)
+{
+	struct clk *clk;
+
+	clk = __clk_lookup(clk_name);
+	if (!clk) {
+		pr_err("%s: unable to find clock by name: %s\n", __func__,
+				clk_name);
+		return 0;
+	}
+
+	return clk_get_rate(clk);
+}
+
+/*
+ * Based on the target frequency, find a match from the VCO frequency parameter
+ * table and return its index
+ */
+static int pll_get_rate_index(struct iproc_pll *pll, unsigned int target_rate)
+{
+	int i;
+
+	for (i = 0; i < pll->num_vco_entries; i++)
+		if (target_rate == pll->vco_param[i].rate)
+			break;
+
+	if (i >= pll->num_vco_entries)
+		return -EINVAL;
+
+	return i;
+}
+
+static int get_kp(unsigned long ref_freq, enum kp_band kp_index)
+{
+	int i;
+
+	if (ref_freq < ref_freq_table[0][0])
+		return -EINVAL;
+
+	for (i = 0; i < NUM_FREQ_BANDS; i++) {
+		if (ref_freq >= ref_freq_table[i][0] &&
+			ref_freq < ref_freq_table[i][1])
+			return kp_table[kp_index][i];
+	}
+	return -EINVAL;
+}
+
+static int pll_wait_for_lock(struct iproc_pll *pll)
+{
+	int i;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+
+	for (i = 0; i < LOCK_DELAY; i++) {
+		u32 val = readl(pll->pll_base + ctrl->status.offset);
+
+		if (val & (1 << ctrl->status.shift))
+			return 0;
+		udelay(10);
+	}
+
+	return -EIO;
+}
+
+static void __pll_disable(struct iproc_pll *pll)
+{
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		val = readl(pll->asiu_base + ctrl->asiu.offset);
+		val &= ~(1 << ctrl->asiu.en_shift);
+		writel(val, pll->asiu_base + ctrl->asiu.offset);
+	}
+
+	/* latch input value so core power can be shut down */
+	val = readl(pll->pwr_base + ctrl->aon.offset);
+	val |= (1 << ctrl->aon.iso_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+
+	/* power down the core */
+	val &= ~(bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+}
+
+static int __pll_enable(struct iproc_pll *pll)
+{
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+
+	/* power up the PLL and make sure it's not latched */
+	val = readl(pll->pwr_base + ctrl->aon.offset);
+	val |= bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift;
+	val &= ~(1 << ctrl->aon.iso_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+
+	/* certain PLLs also need to be ungated from the ASIU top level */
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		val = readl(pll->asiu_base + ctrl->asiu.offset);
+		val |= (1 << ctrl->asiu.en_shift);
+		writel(val, pll->asiu_base + ctrl->asiu.offset);
+	}
+
+	return 0;
+}
+
+static void __pll_put_in_reset(struct iproc_pll *pll)
+{
+	u32 val;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
+
+	val = readl(pll->pll_base + reset->offset);
+	val &= ~(1 << reset->reset_shift | 1 << reset->p_reset_shift);
+	writel(val, pll->pll_base + reset->offset);
+}
+
+static void __pll_bring_out_reset(struct iproc_pll *pll, unsigned int kp,
+		unsigned int ka, unsigned int ki)
+{
+	u32 val;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
+
+	val = readl(pll->pll_base + reset->offset);
+	val &= ~(bit_mask(reset->ki_width) << reset->ki_shift |
+		bit_mask(reset->kp_width) << reset->kp_shift |
+		bit_mask(reset->ka_width) << reset->ka_shift);
+	val |=  ki << reset->ki_shift | kp << reset->kp_shift |
+		ka << reset->ka_shift;
+	val |= 1 << reset->reset_shift | 1 << reset->p_reset_shift;
+	writel(val, pll->pll_base + reset->offset);
+}
+
+static int pll_set_rate(struct iproc_pll *pll, unsigned int rate_index,
+		unsigned long parent_rate)
+{
+	const struct iproc_pll_vco_freq_param *vco =
+				&pll->vco_param[rate_index];
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	int ka = 0, ki, kp, ret;
+	unsigned long rate = vco->rate;
+	u32 val;
+	enum kp_band kp_index;
+	unsigned long ref_freq;
+
+	/*
+	 * reference frequency = parent frequency / PDIV
+	 * If PDIV = 0, then it becomes a multiplier (x2)
+	 */
+	if (vco->pdiv == 0)
+		ref_freq = parent_rate * 2;
+	else
+		ref_freq = parent_rate / vco->pdiv;
+
+	/* determine Ki and Kp index based on target VCO frequency */
+	if (rate >= VCO_LOW && rate < VCO_HIGH) {
+		ki = 4;
+		kp_index = KP_BAND_MID;
+	} else if (rate >= VCO_HIGH && rate && rate < VCO_HIGH_HIGH) {
+		ki = 3;
+		kp_index = KP_BAND_HIGH;
+	} else if (rate >= VCO_HIGH_HIGH && rate < VCO_MAX) {
+		ki = 3;
+		kp_index = KP_BAND_HIGH_HIGH;
+	} else {
+		pr_err("%s: pll: %s has invalid rate: %lu\n", __func__,
+				pll->name, rate);
+		return -EINVAL;
+	}
+
+	kp = get_kp(ref_freq, kp_index);
+	if (kp < 0) {
+		pr_err("%s: pll: %s has invalid kp\n", __func__, pll->name);
+		return kp;
+	}
+
+	ret = __pll_enable(pll);
+	if (ret) {
+		pr_err("%s: pll: %s fails to enable\n", __func__, pll->name);
+		return ret;
+	}
+
+	/* put PLL in reset */
+	__pll_put_in_reset(pll);
+
+	writel(0, pll->pll_base + ctrl->vco_ctrl.u_offset);
+	val = readl(pll->pll_base + ctrl->vco_ctrl.l_offset);
+
+	if (rate >= VCO_LOW && rate < VCO_MID)
+		val |= (1 << PLL_VCO_LOW_SHIFT);
+
+	if (rate < VCO_HIGH)
+		val &= ~(1 << PLL_VCO_HIGH_SHIFT);
+	else
+		val |= (1 << PLL_VCO_HIGH_SHIFT);
+
+	writel(val, pll->pll_base + ctrl->vco_ctrl.l_offset);
+
+	/* program integer part of NDIV */
+	val = readl(pll->pll_base + ctrl->ndiv_int.offset);
+	val &= ~(bit_mask(ctrl->ndiv_int.width) << ctrl->ndiv_int.shift);
+	val |= vco->ndiv_int << ctrl->ndiv_int.shift;
+	writel(val, pll->pll_base + ctrl->ndiv_int.offset);
+
+	/* program fractional part of NDIV */
+	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
+		val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
+		val &= ~(bit_mask(ctrl->ndiv_frac.width) <<
+				ctrl->ndiv_frac.shift);
+		val |= vco->ndiv_frac << ctrl->ndiv_frac.shift;
+		writel(val, pll->pll_base + ctrl->ndiv_frac.offset);
+	}
+
+	/* program PDIV */
+	val = readl(pll->pll_base + ctrl->pdiv.offset);
+	val &= ~(bit_mask(ctrl->pdiv.width) << ctrl->pdiv.shift);
+	val |= vco->pdiv << ctrl->pdiv.shift;
+	writel(val, pll->pll_base + ctrl->pdiv.offset);
+
+	__pll_bring_out_reset(pll, kp, ka, ki);
+
+	ret = pll_wait_for_lock(pll);
+	if (ret < 0) {
+		pr_err("%s: pll: %s failed to lock\n", __func__, pll->name);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int iproc_pll_enable(struct clk_hw *hw)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+
+	return __pll_enable(pll);
+}
+
+static void iproc_pll_disable(struct clk_hw *hw)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+
+	if (ctrl->flags & IPROC_CLK_AON)
+		return;
+
+	__pll_disable(pll);
+}
+
+static unsigned long iproc_pll_recalc_rate(struct clk_hw *hw,
+	unsigned long parent_rate)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+	u64 ndiv;
+	unsigned int ndiv_int, ndiv_frac, pdiv;
+
+	if (parent_rate == 0)
+		return 0;
+
+	/* PLL needs to be locked */
+	val = readl(pll->pll_base + ctrl->status.offset);
+	if ((val & (1 << ctrl->status.shift)) == 0) {
+		pll->rate = 0;
+		return 0;
+	}
+
+	/*
+	 * PLL output frequency =
+	 *
+	 * ((ndiv_int + ndiv_frac / 2^20) * (parent clock rate / pdiv)
+	 */
+	val = readl(pll->pll_base + ctrl->ndiv_int.offset);
+	ndiv_int = (val >> ctrl->ndiv_int.shift) &
+		bit_mask(ctrl->ndiv_int.width);
+	ndiv = ndiv_int << ctrl->ndiv_int.shift;
+
+	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
+		val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
+		ndiv_frac = (val >> ctrl->ndiv_frac.shift) &
+			bit_mask(ctrl->ndiv_frac.width);
+
+		if (ndiv_frac != 0)
+			ndiv = (ndiv_int << ctrl->ndiv_int.shift) | ndiv_frac;
+	}
+
+	val = readl(pll->pll_base + ctrl->pdiv.offset);
+	pdiv = (val >> ctrl->pdiv.shift) & bit_mask(ctrl->pdiv.width);
+
+	pll->rate = (ndiv * parent_rate) >> ctrl->ndiv_int.shift;
+
+	if (pdiv == 0)
+		pll->rate *= 2;
+	else
+		pll->rate /= pdiv;
+
+	return pll->rate;
+}
+
+static const struct clk_ops iproc_pll_ops = {
+	.enable = iproc_pll_enable,
+	.disable = iproc_pll_disable,
+	.recalc_rate = iproc_pll_recalc_rate,
+};
+
+void __init iproc_pll_setup(struct device_node *node,
+		const struct iproc_pll_ctrl *ctrl,
+		const struct iproc_pll_vco_freq_param *vco_param,
+		unsigned int num_vco_entries)
+{
+	int ret;
+	struct clk *clk;
+	struct iproc_pll *pll;
+	struct clk_init_data init;
+	const char *parent_name;
+	unsigned int rate;
+
+	if (WARN_ON(!ctrl))
+		return;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->pll_base = of_iomap(node, 0);
+	if (WARN_ON(!pll->pll_base))
+		goto err_pll_iomap;
+
+	pll->pwr_base = of_iomap(node, 1);
+	if (WARN_ON(!pll->pwr_base))
+		goto err_pwr_iomap;
+
+	/* some PLLs require gating control at the top ASIU level */
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		pll->asiu_base = of_iomap(node, 2);
+		if (WARN_ON(!pll->asiu_base))
+			goto err_asiu_iomap;
+	}
+
+	pll->ctrl = ctrl;
+	pll->name = node->name;
+	init.name = node->name;
+	init.ops = &iproc_pll_ops;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	pll->hw.init = &init;
+
+	/* configure the PLL to the desired VCO frequency if specified */
+	ret = of_property_read_u32(node, "clock-frequency", &rate);
+	if (!ret) {
+		unsigned long parent_rate;
+		int rate_index;
+
+		if (WARN_ON(!vco_param))
+			goto err_clk_register;
+
+		pll->num_vco_entries = num_vco_entries;
+		pll->vco_param = vco_param;
+
+		parent_rate = __get_rate(parent_name);
+		if (WARN_ON(!parent_rate))
+			goto err_clk_register;
+
+		rate_index = pll_get_rate_index(pll, rate);
+		if (WARN_ON(rate_index < 0))
+			goto err_clk_register;
+
+		ret = pll_set_rate(pll, rate_index, parent_rate);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+	}
+
+	clk = clk_register(NULL, &pll->hw);
+	if (WARN_ON(IS_ERR(clk)))
+		goto err_clk_register;
+
+	ret = of_clk_add_provider(node, of_clk_src_simple_get, clk);
+	if (WARN_ON(ret))
+		goto err_clk_add;
+
+	return;
+
+err_clk_add:
+	clk_unregister(clk);
+err_clk_register:
+	if (pll->asiu_base)
+		iounmap(pll->asiu_base);
+err_asiu_iomap:
+	iounmap(pll->pwr_base);
+err_pwr_iomap:
+	iounmap(pll->pll_base);
+err_pll_iomap:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc.h b/drivers/clk/bcm/clk-iproc.h
new file mode 100644
index 0000000..4aa0479
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc.h
@@ -0,0 +1,155 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _CLK_IPROC_H
+#define _CLK_IPROC_H
+
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/of.h>
+#include <linux/clk-provider.h>
+
+#define IPROC_CLK_NAME_LEN 25
+#define IPROC_CLK_INVALID_OFFSET 0xffffffff
+#define bit_mask(width) ((1 << (width)) - 1)
+
+/* clock should not be disabled at runtime */
+#define IPROC_CLK_AON BIT(0)
+
+/* PLL requires gating through ASIU */
+#define IPROC_CLK_PLL_ASIU BIT(1)
+
+/* PLL has fractional part of the NDIV */
+#define IPROC_CLK_PLL_HAS_NDIV_FRAC BIT(2)
+
+/*
+ * Parameters for VCO frequency configuration
+ *
+ * VCO frequency =
+ * ((ndiv_int + ndiv_frac / 2^20) * (ref freqeuncy  / pdiv)
+ */
+struct iproc_pll_vco_freq_param {
+	unsigned long rate;
+	unsigned int ndiv_int;
+	unsigned int ndiv_frac;
+	unsigned int pdiv;
+};
+
+struct iproc_clk_reg_op {
+	unsigned int offset;
+	unsigned int shift;
+	unsigned int width;
+};
+
+/*
+ * Clock gating control at the top ASIU level
+ */
+struct iproc_asiu_gate {
+	unsigned int offset;
+	unsigned int en_shift;
+};
+
+/*
+ * Control of powering on/off of a PLL
+ *
+ * Before powering off a PLL, input isolation (ISO) needs to be enabled
+ */
+struct iproc_pll_aon_pwr_ctrl {
+	unsigned int offset;
+	unsigned int pwr_width;
+	unsigned int pwr_shift;
+	unsigned int iso_shift;
+};
+
+/*
+ * Control of the PLL reset, with Ki, Kp, and Ka parameters
+ */
+struct iproc_pll_reset_ctrl {
+	unsigned int offset;
+	unsigned int reset_shift;
+	unsigned int p_reset_shift;
+	unsigned int ki_shift;
+	unsigned int ki_width;
+	unsigned int kp_shift;
+	unsigned int kp_width;
+	unsigned int ka_shift;
+	unsigned int ka_width;
+};
+
+struct iproc_pll_vco_ctrl {
+	unsigned int u_offset;
+	unsigned int l_offset;
+};
+
+/*
+ * Main PLL control parameters
+ */
+struct iproc_pll_ctrl {
+	unsigned long flags;
+	struct iproc_pll_aon_pwr_ctrl aon;
+	struct iproc_asiu_gate asiu;
+	struct iproc_pll_reset_ctrl reset;
+	struct iproc_clk_reg_op ndiv_int;
+	struct iproc_clk_reg_op ndiv_frac;
+	struct iproc_clk_reg_op pdiv;
+	struct iproc_pll_vco_ctrl vco_ctrl;
+	struct iproc_clk_reg_op status;
+};
+
+/*
+ * Controls enabling/disabling a PLL derived clock
+ */
+struct iproc_clk_enable_ctrl {
+	unsigned int offset;
+	unsigned int enable_shift;
+	unsigned int hold_shift;
+	unsigned int bypass_shift;
+};
+
+/*
+ * Main clock control parameters for clocks derived from the PLLs
+ */
+struct iproc_clk_ctrl {
+	unsigned int channel;
+	unsigned long flags;
+	struct iproc_clk_enable_ctrl enable;
+	struct iproc_clk_reg_op mdiv;
+};
+
+/*
+ * Divisor of the ASIU clocks
+ */
+struct iproc_asiu_div {
+	unsigned int offset;
+	unsigned int en_shift;
+	unsigned int high_shift;
+	unsigned int high_width;
+	unsigned int low_shift;
+	unsigned int low_width;
+};
+
+extern void __init iproc_armpll_setup(struct device_node *node);
+extern void __init iproc_pll_setup(struct device_node *node,
+		const struct iproc_pll_ctrl *ctrl,
+		const struct iproc_pll_vco_freq_param *vco_param,
+		unsigned int num_freqs);
+extern void __init iproc_clk_setup(struct device_node *node,
+		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks);
+extern void __init iproc_asiu_setup(struct device_node *node,
+		const struct iproc_asiu_div *div,
+		const struct iproc_asiu_gate *gate, unsigned int num_clks);
+
+#endif /* _CLK_IPROC_H */
-- 
1.7.9.5

[PATCH v4 2/5] clk: iproc: add initial common clock support

[Ray Jui]

This adds basic and generic support for various iProc PLLs and clocks
including the ARMPLL, GENPLL, LCPLL, MIPIPLL, and ASIU clocks.

SoCs under the iProc architecture can define their specific register
offsets and clock parameters for their PLL and clock controllers. These
parameters can be passed as arugments into the generic iProc PLL and
clock setup functions

Derived from code originally provided by Jonathan Richardson
<jonathar@broadcom.com>

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/clk/bcm/Kconfig            |    9 +
 drivers/clk/bcm/Makefile           |    1 +
 drivers/clk/bcm/clk-iproc-armpll.c |  282 +++++++++++++++++++++
 drivers/clk/bcm/clk-iproc-asiu.c   |  275 +++++++++++++++++++++
 drivers/clk/bcm/clk-iproc-clk.c    |  238 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-pll.c    |  478 ++++++++++++++++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc.h        |  155 ++++++++++++
 7 files changed, 1438 insertions(+)
 create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
 create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
 create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
 create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
 create mode 100644 drivers/clk/bcm/clk-iproc.h

diff --git a/drivers/clk/bcm/Kconfig b/drivers/clk/bcm/Kconfig
index 75506e5..66b5b7f 100644
--- a/drivers/clk/bcm/Kconfig
+++ b/drivers/clk/bcm/Kconfig
@@ -7,3 +7,12 @@ config CLK_BCM_KONA
 	  Enable common clock framework support for Broadcom SoCs
 	  using "Kona" style clock control units, including those
 	  in the BCM281xx and BCM21664 families.
+
+config COMMON_CLK_IPROC
+	bool "Broadcom iProc clock support"
+	depends on ARCH_BCM_IPROC
+	depends on COMMON_CLK
+	default y
+	help
+	  Enable common clock framework support for Broadcom SoCs
+	  based on the "iProc" architecture
diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
index 6297d05..6926636 100644
--- a/drivers/clk/bcm/Makefile
+++ b/drivers/clk/bcm/Makefile
@@ -2,3 +2,4 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
+obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
diff --git a/drivers/clk/bcm/clk-iproc-armpll.c b/drivers/clk/bcm/clk-iproc-armpll.c
new file mode 100644
index 0000000..965cd4e
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-armpll.c
@@ -0,0 +1,282 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+
+#define IPROC_CLK_MAX_FREQ_POLICY                    0x3
+#define IPROC_CLK_POLICY_FREQ_OFFSET                 0x008
+#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT      8
+#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK       0x7
+
+#define IPROC_CLK_PLLARMA_OFFSET                     0xc00
+#define IPROC_CLK_PLLARMA_LOCK_SHIFT                 28
+#define IPROC_CLK_PLLARMA_PDIV_SHIFT                 24
+#define IPROC_CLK_PLLARMA_PDIV_MASK                  0xf
+#define IPROC_CLK_PLLARMA_NDIV_INT_SHIFT             8
+#define IPROC_CLK_PLLARMA_NDIV_INT_MASK              0x3ff
+
+#define IPROC_CLK_PLLARMB_OFFSET                     0xc04
+#define IPROC_CLK_PLLARMB_NDIV_FRAC_MASK             0xfffff
+
+#define IPROC_CLK_PLLARMC_OFFSET                     0xc08
+#define IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT            8
+#define IPROC_CLK_PLLARMC_MDIV_MASK                  0xff
+
+#define IPROC_CLK_PLLARMCTL5_OFFSET                  0xc20
+#define IPROC_CLK_PLLARMCTL5_H_MDIV_MASK             0xff
+
+#define IPROC_CLK_PLLARM_OFFSET_OFFSET               0xc24
+#define IPROC_CLK_PLLARM_SW_CTL_SHIFT                29
+#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT       20
+#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK        0xff
+#define IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK       0xfffff
+
+#define IPROC_CLK_ARM_DIV_OFFSET                     0xe00
+#define IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT  4
+#define IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK        0xf
+
+#define IPROC_CLK_POLICY_DBG_OFFSET                  0xec0
+#define IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT          12
+#define IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK           0x7
+
+enum iproc_arm_pll_fid {
+	ARM_PLL_FID_CRYSTAL_CLK   = 0,
+	ARM_PLL_FID_SYS_CLK       = 2,
+	ARM_PLL_FID_CH0_SLOW_CLK  = 6,
+	ARM_PLL_FID_CH1_FAST_CLK  = 7
+};
+
+struct iproc_arm_pll {
+	struct clk_hw hw;
+	void __iomem *base;
+	unsigned long rate;
+};
+
+#define to_iproc_arm_pll(hw) container_of(hw, struct iproc_arm_pll, hw)
+
+static unsigned int __get_fid(struct iproc_arm_pll *pll)
+{
+	u32 val;
+	unsigned int policy, fid, active_fid;
+
+	val = readl(pll->base + IPROC_CLK_ARM_DIV_OFFSET);
+	if (val & (1 << IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT))
+		policy = val & IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK;
+	else
+		policy = 0;
+
+	/* something is seriously wrong */
+	BUG_ON(policy > IPROC_CLK_MAX_FREQ_POLICY);
+
+	val = readl(pll->base + IPROC_CLK_POLICY_FREQ_OFFSET);
+	fid = (val >> (IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT * policy)) &
+		IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK;
+
+	val = readl(pll->base + IPROC_CLK_POLICY_DBG_OFFSET);
+	active_fid = IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK &
+		(val >> IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT);
+	if (fid != active_fid) {
+		pr_debug("%s: fid override %u->%u\n", __func__,	fid,
+				active_fid);
+		fid = active_fid;
+	}
+
+	pr_debug("%s: active fid: %u\n", __func__, fid);
+
+	return fid;
+}
+
+/*
+ * Determine the mdiv (post divider) based on the frequency ID being used.
+ * There are 4 sources that can be used to derive the output clock rate:
+ *    - 25 MHz Crystal
+ *    - System clock
+ *    - PLL channel 0 (slow clock)
+ *    - PLL channel 1 (fast clock)
+ */
+static int __get_mdiv(struct iproc_arm_pll *pll)
+{
+	unsigned int fid;
+	int mdiv;
+	u32 val;
+
+	fid = __get_fid(pll);
+
+	switch (fid) {
+	case ARM_PLL_FID_CRYSTAL_CLK:
+	case ARM_PLL_FID_SYS_CLK:
+		mdiv = 1;
+		break;
+
+	case ARM_PLL_FID_CH0_SLOW_CLK:
+		val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
+		mdiv = val & IPROC_CLK_PLLARMC_MDIV_MASK;
+		if (mdiv == 0)
+			mdiv = 256;
+		break;
+
+	case ARM_PLL_FID_CH1_FAST_CLK:
+		val = readl(pll->base +	IPROC_CLK_PLLARMCTL5_OFFSET);
+		mdiv = val & IPROC_CLK_PLLARMCTL5_H_MDIV_MASK;
+		if (mdiv == 0)
+			mdiv = 256;
+		break;
+
+	default:
+		mdiv = -EFAULT;
+	}
+
+	return mdiv;
+}
+
+static unsigned int __get_ndiv(struct iproc_arm_pll *pll)
+{
+	u32 val;
+	unsigned int ndiv_int, ndiv_frac, ndiv;
+
+	val = readl(pll->base + IPROC_CLK_PLLARM_OFFSET_OFFSET);
+	if (val & (1 << IPROC_CLK_PLLARM_SW_CTL_SHIFT)) {
+		/*
+		 * offset mode is active. Read the ndiv from the PLLARM OFFSET
+		 * register
+		 */
+		ndiv_int = (val >> IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT) &
+			IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK;
+		if (ndiv_int == 0)
+			ndiv_int = 256;
+
+		ndiv_frac = val & IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK;
+	} else {
+		/* offset mode not active */
+		val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
+		ndiv_int = (val >> IPROC_CLK_PLLARMA_NDIV_INT_SHIFT) &
+			IPROC_CLK_PLLARMA_NDIV_INT_MASK;
+		if (ndiv_int == 0)
+			ndiv_int = 1024;
+
+		val = readl(pll->base + IPROC_CLK_PLLARMB_OFFSET);
+		ndiv_frac = val & IPROC_CLK_PLLARMB_NDIV_FRAC_MASK;
+	}
+
+	ndiv = (ndiv_int << 20) | ndiv_frac;
+
+	return ndiv;
+}
+
+/*
+ * The output frequency of the ARM PLL is calculated based on the ARM PLL
+ * divider values:
+ *   pdiv = ARM PLL pre-divider
+ *   ndiv = ARM PLL multiplier
+ *   mdiv = ARM PLL post divider
+ *
+ * The frequency is calculated by:
+ *   ((ndiv * parent clock rate) / pdiv) / mdiv
+ */
+static unsigned long iproc_arm_pll_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_arm_pll *pll = to_iproc_arm_pll(hw);
+	u32 val;
+	int mdiv;
+	u64 ndiv;
+	unsigned int pdiv;
+
+	/* in bypass mode, use parent rate */
+	val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
+	if (val & (1 << IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT)) {
+		pll->rate = parent_rate;
+		return pll->rate;
+	}
+
+	/* PLL needs to be locked */
+	val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
+	if (!(val & (1 << IPROC_CLK_PLLARMA_LOCK_SHIFT))) {
+		pll->rate = 0;
+		return 0;
+	}
+
+	pdiv = (val >> IPROC_CLK_PLLARMA_PDIV_SHIFT) &
+		IPROC_CLK_PLLARMA_PDIV_MASK;
+	if (pdiv == 0)
+		pdiv = 16;
+
+	ndiv = __get_ndiv(pll);
+	mdiv = __get_mdiv(pll);
+	if (mdiv <= 0) {
+		pll->rate = 0;
+		return 0;
+	}
+	pll->rate = (ndiv * parent_rate) >> 20;
+	pll->rate = (pll->rate / pdiv) / mdiv;
+
+	pr_debug("%s: ARM PLL rate: %lu. parent rate: %lu\n", __func__,
+			pll->rate, parent_rate);
+	pr_debug("%s: ndiv_int: %u, pdiv: %u, mdiv: %d\n", __func__,
+			(unsigned int)(ndiv >> 20), pdiv, mdiv);
+
+	return pll->rate;
+}
+
+static const struct clk_ops iproc_arm_pll_ops = {
+	.recalc_rate = iproc_arm_pll_recalc_rate,
+};
+
+void __init iproc_armpll_setup(struct device_node *node)
+{
+	int ret;
+	struct clk *clk;
+	struct iproc_arm_pll *pll;
+	struct clk_init_data init;
+	const char *parent_name;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->base = of_iomap(node, 0);
+	if (WARN_ON(!pll->base))
+		goto err_free_pll;
+
+	init.name = node->name;
+	init.ops = &iproc_arm_pll_ops;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	pll->hw.init = &init;
+
+	clk = clk_register(NULL, &pll->hw);
+	if (WARN_ON(IS_ERR(clk)))
+		goto err_iounmap;
+
+	ret = of_clk_add_provider(node, of_clk_src_simple_get, clk);
+	if (WARN_ON(ret))
+		goto err_clk_unregister;
+
+	return;
+
+err_clk_unregister:
+	clk_unregister(clk);
+err_iounmap:
+	iounmap(pll->base);
+err_free_pll:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc-asiu.c b/drivers/clk/bcm/clk-iproc-asiu.c
new file mode 100644
index 0000000..ab86b8c
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-asiu.c
@@ -0,0 +1,275 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+struct iproc_asiu;
+
+struct iproc_asiu_clk {
+	struct clk_hw hw;
+	const char *name;
+	struct iproc_asiu *asiu;
+	unsigned long rate;
+	struct iproc_asiu_div div;
+	struct iproc_asiu_gate gate;
+};
+
+struct iproc_asiu {
+	void __iomem *div_base;
+	void __iomem *gate_base;
+
+	struct clk_onecell_data clk_data;
+	struct iproc_asiu_clk *clks;
+};
+
+#define to_asiu_clk(hw) container_of(hw, struct iproc_asiu_clk, hw)
+
+static int iproc_asiu_clk_enable(struct clk_hw *hw)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+
+	/* some clocks at the ASIU level are always enabled */
+	if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
+		return 0;
+
+	val = readl(asiu->gate_base + clk->gate.offset);
+	val |= (1 << clk->gate.en_shift);
+	writel(val, asiu->gate_base + clk->gate.offset);
+
+	return 0;
+}
+
+static void iproc_asiu_clk_disable(struct clk_hw *hw)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+
+	/* some clocks at the ASIU level are always enabled */
+	if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
+		return;
+
+	val = readl(asiu->gate_base + clk->gate.offset);
+	val &= ~(1 << clk->gate.en_shift);
+	writel(val, asiu->gate_base + clk->gate.offset);
+}
+
+static unsigned long iproc_asiu_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+	unsigned int div_h, div_l;
+
+	if (parent_rate == 0) {
+		clk->rate = 0;
+		return 0;
+	}
+
+	/* if clock divisor is not enabled, simply return parent rate */
+	val = readl(asiu->div_base + clk->div.offset);
+	if ((val & (1 << clk->div.en_shift)) == 0) {
+		clk->rate = parent_rate;
+		return parent_rate;
+	}
+
+	/* clock rate = parent rate / (high_div + 1) + (low_div + 1) */
+	div_h = (val >> clk->div.high_shift) & bit_mask(clk->div.high_width);
+	div_h++;
+	div_l = (val >> clk->div.low_shift) & bit_mask(clk->div.low_width);
+	div_l++;
+
+	clk->rate = parent_rate / (div_h + div_l);
+	pr_debug("%s: rate: %lu. parent rate: %lu div_h: %u div_l: %u\n",
+		__func__, clk->rate, parent_rate, div_h, div_l);
+
+	return clk->rate;
+}
+
+static long iproc_asiu_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	unsigned int div;
+
+	if (rate == 0 || *parent_rate == 0)
+		return -EINVAL;
+
+	if (rate == *parent_rate)
+		return *parent_rate;
+
+	div = DIV_ROUND_UP(*parent_rate, rate);
+	if (div < 2)
+		return *parent_rate;
+
+	return *parent_rate / div;
+}
+
+static int iproc_asiu_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	unsigned int div, div_h, div_l;
+	u32 val;
+
+	if (rate == 0 || parent_rate == 0)
+		return -EINVAL;
+
+	/* simply disable the divisor if one wants the same rate as parent */
+	if (rate == parent_rate) {
+		val = readl(asiu->div_base + clk->div.offset);
+		val &= ~(1 << clk->div.en_shift);
+		writel(val, asiu->div_base + clk->div.offset);
+		return 0;
+	}
+
+	div = DIV_ROUND_UP(parent_rate, rate);
+	if (div < 2)
+		return -EINVAL;
+
+	div_h = div_l = div >> 1;
+	div_h--;
+	div_l--;
+
+	val = readl(asiu->div_base + clk->div.offset);
+	val |= 1 << clk->div.en_shift;
+	if (div_h) {
+		val &= ~(bit_mask(clk->div.high_width)
+				<< clk->div.high_shift);
+		val |= div_h << clk->div.high_shift;
+	} else {
+		val &= ~(bit_mask(clk->div.high_width)
+				<< clk->div.high_shift);
+	}
+	if (div_l) {
+		val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
+		val |= div_l << clk->div.low_shift;
+	} else {
+		val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
+	}
+	writel(val, asiu->div_base + clk->div.offset);
+
+	return 0;
+}
+
+static const struct clk_ops iproc_asiu_ops = {
+	.enable = iproc_asiu_clk_enable,
+	.disable = iproc_asiu_clk_disable,
+	.recalc_rate = iproc_asiu_clk_recalc_rate,
+	.round_rate = iproc_asiu_clk_round_rate,
+	.set_rate = iproc_asiu_clk_set_rate,
+};
+
+void __init iproc_asiu_setup(struct device_node *node,
+		const struct iproc_asiu_div *div,
+		const struct iproc_asiu_gate *gate, unsigned int num_clks)
+{
+	int i, ret;
+	struct iproc_asiu *asiu;
+
+	if (WARN_ON(!gate || !div))
+		return;
+
+	asiu = kzalloc(sizeof(*asiu), GFP_KERNEL);
+	if (WARN_ON(!asiu))
+		return;
+
+	asiu->clk_data.clk_num = num_clks;
+	asiu->clk_data.clks = kcalloc(num_clks, sizeof(*asiu->clk_data.clks),
+			GFP_KERNEL);
+	if (WARN_ON(!asiu->clk_data.clks))
+		goto err_clks;
+
+	asiu->clks = kcalloc(num_clks, sizeof(*asiu->clks), GFP_KERNEL);
+	if (WARN_ON(!asiu->clks))
+		goto err_asiu_clks;
+
+	asiu->div_base = of_iomap(node, 0);
+	if (WARN_ON(!asiu->div_base))
+		goto err_iomap_div;
+
+	asiu->gate_base = of_iomap(node, 1);
+	if (WARN_ON(!asiu->gate_base))
+		goto err_iomap_gate;
+
+	for (i = 0; i < num_clks; i++) {
+		struct clk_init_data init;
+		struct clk *clk;
+		const char *parent_name;
+		struct iproc_asiu_clk *asiu_clk;
+		const char *clk_name;
+
+		clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
+		if (WARN_ON(!clk_name))
+			goto err_clk_register;
+
+		ret = of_property_read_string_index(node, "clock-output-names",
+				i, &clk_name);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+
+		asiu_clk = &asiu->clks[i];
+		asiu_clk->name = clk_name;
+		asiu_clk->asiu = asiu;
+		asiu_clk->div = div[i];
+		asiu_clk->gate = gate[i];
+		init.name = clk_name;
+		init.ops = &iproc_asiu_ops;
+		init.flags = 0;
+		parent_name = of_clk_get_parent_name(node, 0);
+		init.parent_names = (parent_name ? &parent_name : NULL);
+		init.num_parents = (parent_name ? 1 : 0);
+		asiu_clk->hw.init = &init;
+
+		clk = clk_register(NULL, &asiu_clk->hw);
+		if (WARN_ON(IS_ERR(clk)))
+			goto err_clk_register;
+		asiu->clk_data.clks[i] = clk;
+	}
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get,
+			&asiu->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_register;
+
+	return;
+
+err_clk_register:
+	for (i = 0; i < num_clks; i++)
+		kfree(asiu->clks[i].name);
+	iounmap(asiu->gate_base);
+
+err_iomap_gate:
+	iounmap(asiu->div_base);
+
+err_iomap_div:
+	kfree(asiu->clks);
+
+err_asiu_clks:
+	kfree(asiu->clk_data.clks);
+
+err_clks:
+	kfree(asiu);
+}
diff --git a/drivers/clk/bcm/clk-iproc-clk.c b/drivers/clk/bcm/clk-iproc-clk.c
new file mode 100644
index 0000000..be3c42c
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-clk.c
@@ -0,0 +1,238 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+struct iproc_pll;
+
+struct iproc_clk {
+	struct clk_hw hw;
+	const char *name;
+	struct iproc_pll *pll;
+	unsigned long rate;
+	const struct iproc_clk_ctrl *ctrl;
+};
+
+struct iproc_pll {
+	void __iomem *base;
+	struct clk_onecell_data clk_data;
+	struct iproc_clk *clks;
+};
+
+#define to_iproc_clk(hw) container_of(hw, struct iproc_clk, hw)
+
+static int iproc_clk_enable(struct clk_hw *hw)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+
+	/* channel enable is active low */
+	val = readl(pll->base + ctrl->enable.offset);
+	val &= ~(1 << ctrl->enable.enable_shift);
+	writel(val, pll->base + ctrl->enable.offset);
+
+	/* also make sure channel is not held */
+	val = readl(pll->base + ctrl->enable.offset);
+	val &= ~(1 << ctrl->enable.hold_shift);
+	writel(val, pll->base + ctrl->enable.offset);
+
+	return 0;
+}
+
+static void iproc_clk_disable(struct clk_hw *hw)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+
+	if (ctrl->flags & IPROC_CLK_AON)
+		return;
+
+	val = readl(pll->base + ctrl->enable.offset);
+	val |= 1 << ctrl->enable.enable_shift;
+	writel(val, pll->base + ctrl->enable.offset);
+}
+
+static unsigned long iproc_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+	unsigned int mdiv;
+
+	if (parent_rate == 0)
+		return 0;
+
+	val = readl(pll->base + ctrl->mdiv.offset);
+	mdiv = (val >> ctrl->mdiv.shift) & bit_mask(ctrl->mdiv.width);
+	if (mdiv == 0)
+		mdiv = 256;
+
+	clk->rate = parent_rate / mdiv;
+
+	return clk->rate;
+}
+
+static long iproc_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	unsigned int div;
+
+	if (rate == 0 || *parent_rate == 0)
+		return -EINVAL;
+
+	if (rate == *parent_rate)
+		return *parent_rate;
+
+	div = DIV_ROUND_UP(*parent_rate, rate);
+	if (div < 2)
+		return *parent_rate;
+
+	if (div > 256)
+		div = 256;
+
+	return *parent_rate / div;
+}
+
+static int iproc_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+	unsigned int div;
+
+	if (rate == 0 || parent_rate == 0)
+		return -EINVAL;
+
+	div = DIV_ROUND_UP(parent_rate, rate);
+	if (div > 256)
+		return -EINVAL;
+
+	val = readl(pll->base + ctrl->mdiv.offset);
+	if (div == 256) {
+		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
+	} else {
+		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
+		val |= div << ctrl->mdiv.shift;
+	}
+	writel(val, pll->base + ctrl->mdiv.offset);
+	clk->rate = parent_rate / div;
+
+	return 0;
+}
+
+static const struct clk_ops iproc_clk_ops = {
+	.enable = iproc_clk_enable,
+	.disable = iproc_clk_disable,
+	.recalc_rate = iproc_clk_recalc_rate,
+	.round_rate = iproc_clk_round_rate,
+	.set_rate = iproc_clk_set_rate,
+};
+
+void __init iproc_clk_setup(struct device_node *node,
+		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks)
+{
+	int i, ret;
+	struct iproc_pll *pll;
+
+	if (WARN_ON(!ctrl))
+		return;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->clk_data.clk_num = num_clks;
+	pll->clk_data.clks = kcalloc(num_clks, sizeof(*pll->clk_data.clks),
+			GFP_KERNEL);
+	if (WARN_ON(!pll->clk_data.clks))
+		goto err_clks;
+
+	pll->clks = kcalloc(num_clks, sizeof(*pll->clks), GFP_KERNEL);
+	if (WARN_ON(!pll->clks))
+		goto err_pll_clks;
+
+	pll->base = of_iomap(node, 0);
+	if (WARN_ON(!pll->base))
+		goto err_iomap;
+
+	for (i = 0; i < num_clks; i++) {
+		struct clk_init_data init;
+		struct clk *clk;
+		const char *parent_name;
+		struct iproc_clk *iclk;
+		const char *clk_name;
+
+		clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
+		if (WARN_ON(!clk_name))
+			goto err_clk_register;
+
+		ret = of_property_read_string_index(node, "clock-output-names",
+				i, &clk_name);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+
+		iclk = &pll->clks[i];
+		iclk->name = clk_name;
+		iclk->pll = pll;
+		iclk->ctrl = &ctrl[i];
+		init.name = clk_name;
+		init.ops = &iproc_clk_ops;
+		init.flags = 0;
+		parent_name = of_clk_get_parent_name(node, 0);
+		init.parent_names = (parent_name ? &parent_name : NULL);
+		init.num_parents = (parent_name ? 1 : 0);
+		iclk->hw.init = &init;
+
+		clk = clk_register(NULL, &iclk->hw);
+		if (WARN_ON(IS_ERR(clk)))
+			goto err_clk_register;
+		pll->clk_data.clks[i] = clk;
+	}
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_register;
+
+	return;
+
+err_clk_register:
+	for (i = 0; i < num_clks; i++)
+		kfree(pll->clks[i].name);
+	iounmap(pll->base);
+
+err_iomap:
+	kfree(pll->clks);
+
+err_pll_clks:
+	kfree(pll->clk_data.clks);
+
+err_clks:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc-pll.c b/drivers/clk/bcm/clk-iproc-pll.c
new file mode 100644
index 0000000..a4d98b6
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-pll.c
@@ -0,0 +1,478 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+#define PLL_VCO_HIGH_SHIFT 19
+#define PLL_VCO_LOW_SHIFT  30
+
+/* number of delay loops waiting for PLL to lock */
+#define LOCK_DELAY 100
+
+/* number of VCO frequency bands */
+#define NUM_FREQ_BANDS 8
+
+#define NUM_KP_BANDS 3
+enum kp_band {
+	KP_BAND_MID = 0,
+	KP_BAND_HIGH,
+	KP_BAND_HIGH_HIGH
+};
+
+static const unsigned int kp_table[NUM_KP_BANDS][NUM_FREQ_BANDS] = {
+	{ 5, 6, 6, 7, 7, 8, 9, 10 },
+	{ 4, 4, 5, 5, 6, 7, 8, 9  },
+	{ 4, 5, 5, 6, 7, 8, 9, 10 },
+};
+
+static const unsigned long ref_freq_table[NUM_FREQ_BANDS][2] = {
+	{ 10000000,  12500000  },
+	{ 12500000,  15000000  },
+	{ 15000000,  20000000  },
+	{ 20000000,  25000000  },
+	{ 25000000,  50000000  },
+	{ 50000000,  75000000  },
+	{ 75000000,  100000000 },
+	{ 100000000, 125000000 },
+};
+
+enum vco_freq_range {
+	VCO_LOW       = 700000000U,
+	VCO_MID       = 1200000000U,
+	VCO_HIGH      = 2200000000U,
+	VCO_HIGH_HIGH = 3100000000U,
+	VCO_MAX       = 4000000000U,
+};
+
+struct iproc_pll {
+	struct clk_hw hw;
+	void __iomem *pll_base;
+	void __iomem *pwr_base;
+	void __iomem *asiu_base;
+	const char *name;
+	const struct iproc_pll_ctrl *ctrl;
+	const struct iproc_pll_vco_freq_param *vco_param;
+	unsigned int num_vco_entries;
+	unsigned long rate;
+};
+
+#define to_iproc_pll(hw) container_of(hw, struct iproc_pll, hw)
+
+/*
+ * Get the clock rate based on name
+ */
+static unsigned long __get_rate(const char *clk_name)
+{
+	struct clk *clk;
+
+	clk = __clk_lookup(clk_name);
+	if (!clk) {
+		pr_err("%s: unable to find clock by name: %s\n", __func__,
+				clk_name);
+		return 0;
+	}
+
+	return clk_get_rate(clk);
+}
+
+/*
+ * Based on the target frequency, find a match from the VCO frequency parameter
+ * table and return its index
+ */
+static int pll_get_rate_index(struct iproc_pll *pll, unsigned int target_rate)
+{
+	int i;
+
+	for (i = 0; i < pll->num_vco_entries; i++)
+		if (target_rate == pll->vco_param[i].rate)
+			break;
+
+	if (i >= pll->num_vco_entries)
+		return -EINVAL;
+
+	return i;
+}
+
+static int get_kp(unsigned long ref_freq, enum kp_band kp_index)
+{
+	int i;
+
+	if (ref_freq < ref_freq_table[0][0])
+		return -EINVAL;
+
+	for (i = 0; i < NUM_FREQ_BANDS; i++) {
+		if (ref_freq >= ref_freq_table[i][0] &&
+			ref_freq < ref_freq_table[i][1])
+			return kp_table[kp_index][i];
+	}
+	return -EINVAL;
+}
+
+static int pll_wait_for_lock(struct iproc_pll *pll)
+{
+	int i;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+
+	for (i = 0; i < LOCK_DELAY; i++) {
+		u32 val = readl(pll->pll_base + ctrl->status.offset);
+
+		if (val & (1 << ctrl->status.shift))
+			return 0;
+		udelay(10);
+	}
+
+	return -EIO;
+}
+
+static void __pll_disable(struct iproc_pll *pll)
+{
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		val = readl(pll->asiu_base + ctrl->asiu.offset);
+		val &= ~(1 << ctrl->asiu.en_shift);
+		writel(val, pll->asiu_base + ctrl->asiu.offset);
+	}
+
+	/* latch input value so core power can be shut down */
+	val = readl(pll->pwr_base + ctrl->aon.offset);
+	val |= (1 << ctrl->aon.iso_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+
+	/* power down the core */
+	val &= ~(bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+}
+
+static int __pll_enable(struct iproc_pll *pll)
+{
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+
+	/* power up the PLL and make sure it's not latched */
+	val = readl(pll->pwr_base + ctrl->aon.offset);
+	val |= bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift;
+	val &= ~(1 << ctrl->aon.iso_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+
+	/* certain PLLs also need to be ungated from the ASIU top level */
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		val = readl(pll->asiu_base + ctrl->asiu.offset);
+		val |= (1 << ctrl->asiu.en_shift);
+		writel(val, pll->asiu_base + ctrl->asiu.offset);
+	}
+
+	return 0;
+}
+
+static void __pll_put_in_reset(struct iproc_pll *pll)
+{
+	u32 val;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
+
+	val = readl(pll->pll_base + reset->offset);
+	val &= ~(1 << reset->reset_shift | 1 << reset->p_reset_shift);
+	writel(val, pll->pll_base + reset->offset);
+}
+
+static void __pll_bring_out_reset(struct iproc_pll *pll, unsigned int kp,
+		unsigned int ka, unsigned int ki)
+{
+	u32 val;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
+
+	val = readl(pll->pll_base + reset->offset);
+	val &= ~(bit_mask(reset->ki_width) << reset->ki_shift |
+		bit_mask(reset->kp_width) << reset->kp_shift |
+		bit_mask(reset->ka_width) << reset->ka_shift);
+	val |=  ki << reset->ki_shift | kp << reset->kp_shift |
+		ka << reset->ka_shift;
+	val |= 1 << reset->reset_shift | 1 << reset->p_reset_shift;
+	writel(val, pll->pll_base + reset->offset);
+}
+
+static int pll_set_rate(struct iproc_pll *pll, unsigned int rate_index,
+		unsigned long parent_rate)
+{
+	const struct iproc_pll_vco_freq_param *vco =
+				&pll->vco_param[rate_index];
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	int ka = 0, ki, kp, ret;
+	unsigned long rate = vco->rate;
+	u32 val;
+	enum kp_band kp_index;
+	unsigned long ref_freq;
+
+	/*
+	 * reference frequency = parent frequency / PDIV
+	 * If PDIV = 0, then it becomes a multiplier (x2)
+	 */
+	if (vco->pdiv == 0)
+		ref_freq = parent_rate * 2;
+	else
+		ref_freq = parent_rate / vco->pdiv;
+
+	/* determine Ki and Kp index based on target VCO frequency */
+	if (rate >= VCO_LOW && rate < VCO_HIGH) {
+		ki = 4;
+		kp_index = KP_BAND_MID;
+	} else if (rate >= VCO_HIGH && rate && rate < VCO_HIGH_HIGH) {
+		ki = 3;
+		kp_index = KP_BAND_HIGH;
+	} else if (rate >= VCO_HIGH_HIGH && rate < VCO_MAX) {
+		ki = 3;
+		kp_index = KP_BAND_HIGH_HIGH;
+	} else {
+		pr_err("%s: pll: %s has invalid rate: %lu\n", __func__,
+				pll->name, rate);
+		return -EINVAL;
+	}
+
+	kp = get_kp(ref_freq, kp_index);
+	if (kp < 0) {
+		pr_err("%s: pll: %s has invalid kp\n", __func__, pll->name);
+		return kp;
+	}
+
+	ret = __pll_enable(pll);
+	if (ret) {
+		pr_err("%s: pll: %s fails to enable\n", __func__, pll->name);
+		return ret;
+	}
+
+	/* put PLL in reset */
+	__pll_put_in_reset(pll);
+
+	writel(0, pll->pll_base + ctrl->vco_ctrl.u_offset);
+	val = readl(pll->pll_base + ctrl->vco_ctrl.l_offset);
+
+	if (rate >= VCO_LOW && rate < VCO_MID)
+		val |= (1 << PLL_VCO_LOW_SHIFT);
+
+	if (rate < VCO_HIGH)
+		val &= ~(1 << PLL_VCO_HIGH_SHIFT);
+	else
+		val |= (1 << PLL_VCO_HIGH_SHIFT);
+
+	writel(val, pll->pll_base + ctrl->vco_ctrl.l_offset);
+
+	/* program integer part of NDIV */
+	val = readl(pll->pll_base + ctrl->ndiv_int.offset);
+	val &= ~(bit_mask(ctrl->ndiv_int.width) << ctrl->ndiv_int.shift);
+	val |= vco->ndiv_int << ctrl->ndiv_int.shift;
+	writel(val, pll->pll_base + ctrl->ndiv_int.offset);
+
+	/* program fractional part of NDIV */
+	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
+		val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
+		val &= ~(bit_mask(ctrl->ndiv_frac.width) <<
+				ctrl->ndiv_frac.shift);
+		val |= vco->ndiv_frac << ctrl->ndiv_frac.shift;
+		writel(val, pll->pll_base + ctrl->ndiv_frac.offset);
+	}
+
+	/* program PDIV */
+	val = readl(pll->pll_base + ctrl->pdiv.offset);
+	val &= ~(bit_mask(ctrl->pdiv.width) << ctrl->pdiv.shift);
+	val |= vco->pdiv << ctrl->pdiv.shift;
+	writel(val, pll->pll_base + ctrl->pdiv.offset);
+
+	__pll_bring_out_reset(pll, kp, ka, ki);
+
+	ret = pll_wait_for_lock(pll);
+	if (ret < 0) {
+		pr_err("%s: pll: %s failed to lock\n", __func__, pll->name);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int iproc_pll_enable(struct clk_hw *hw)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+
+	return __pll_enable(pll);
+}
+
+static void iproc_pll_disable(struct clk_hw *hw)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+
+	if (ctrl->flags & IPROC_CLK_AON)
+		return;
+
+	__pll_disable(pll);
+}
+
+static unsigned long iproc_pll_recalc_rate(struct clk_hw *hw,
+	unsigned long parent_rate)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+	u64 ndiv;
+	unsigned int ndiv_int, ndiv_frac, pdiv;
+
+	if (parent_rate == 0)
+		return 0;
+
+	/* PLL needs to be locked */
+	val = readl(pll->pll_base + ctrl->status.offset);
+	if ((val & (1 << ctrl->status.shift)) == 0) {
+		pll->rate = 0;
+		return 0;
+	}
+
+	/*
+	 * PLL output frequency =
+	 *
+	 * ((ndiv_int + ndiv_frac / 2^20) * (parent clock rate / pdiv)
+	 */
+	val = readl(pll->pll_base + ctrl->ndiv_int.offset);
+	ndiv_int = (val >> ctrl->ndiv_int.shift) &
+		bit_mask(ctrl->ndiv_int.width);
+	ndiv = ndiv_int << ctrl->ndiv_int.shift;
+
+	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
+		val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
+		ndiv_frac = (val >> ctrl->ndiv_frac.shift) &
+			bit_mask(ctrl->ndiv_frac.width);
+
+		if (ndiv_frac != 0)
+			ndiv = (ndiv_int << ctrl->ndiv_int.shift) | ndiv_frac;
+	}
+
+	val = readl(pll->pll_base + ctrl->pdiv.offset);
+	pdiv = (val >> ctrl->pdiv.shift) & bit_mask(ctrl->pdiv.width);
+
+	pll->rate = (ndiv * parent_rate) >> ctrl->ndiv_int.shift;
+
+	if (pdiv == 0)
+		pll->rate *= 2;
+	else
+		pll->rate /= pdiv;
+
+	return pll->rate;
+}
+
+static const struct clk_ops iproc_pll_ops = {
+	.enable = iproc_pll_enable,
+	.disable = iproc_pll_disable,
+	.recalc_rate = iproc_pll_recalc_rate,
+};
+
+void __init iproc_pll_setup(struct device_node *node,
+		const struct iproc_pll_ctrl *ctrl,
+		const struct iproc_pll_vco_freq_param *vco_param,
+		unsigned int num_vco_entries)
+{
+	int ret;
+	struct clk *clk;
+	struct iproc_pll *pll;
+	struct clk_init_data init;
+	const char *parent_name;
+	unsigned int rate;
+
+	if (WARN_ON(!ctrl))
+		return;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->pll_base = of_iomap(node, 0);
+	if (WARN_ON(!pll->pll_base))
+		goto err_pll_iomap;
+
+	pll->pwr_base = of_iomap(node, 1);
+	if (WARN_ON(!pll->pwr_base))
+		goto err_pwr_iomap;
+
+	/* some PLLs require gating control at the top ASIU level */
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		pll->asiu_base = of_iomap(node, 2);
+		if (WARN_ON(!pll->asiu_base))
+			goto err_asiu_iomap;
+	}
+
+	pll->ctrl = ctrl;
+	pll->name = node->name;
+	init.name = node->name;
+	init.ops = &iproc_pll_ops;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	pll->hw.init = &init;
+
+	/* configure the PLL to the desired VCO frequency if specified */
+	ret = of_property_read_u32(node, "clock-frequency", &rate);
+	if (!ret) {
+		unsigned long parent_rate;
+		int rate_index;
+
+		if (WARN_ON(!vco_param))
+			goto err_clk_register;
+
+		pll->num_vco_entries = num_vco_entries;
+		pll->vco_param = vco_param;
+
+		parent_rate = __get_rate(parent_name);
+		if (WARN_ON(!parent_rate))
+			goto err_clk_register;
+
+		rate_index = pll_get_rate_index(pll, rate);
+		if (WARN_ON(rate_index < 0))
+			goto err_clk_register;
+
+		ret = pll_set_rate(pll, rate_index, parent_rate);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+	}
+
+	clk = clk_register(NULL, &pll->hw);
+	if (WARN_ON(IS_ERR(clk)))
+		goto err_clk_register;
+
+	ret = of_clk_add_provider(node, of_clk_src_simple_get, clk);
+	if (WARN_ON(ret))
+		goto err_clk_add;
+
+	return;
+
+err_clk_add:
+	clk_unregister(clk);
+err_clk_register:
+	if (pll->asiu_base)
+		iounmap(pll->asiu_base);
+err_asiu_iomap:
+	iounmap(pll->pwr_base);
+err_pwr_iomap:
+	iounmap(pll->pll_base);
+err_pll_iomap:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc.h b/drivers/clk/bcm/clk-iproc.h
new file mode 100644
index 0000000..4aa0479
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc.h
@@ -0,0 +1,155 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _CLK_IPROC_H
+#define _CLK_IPROC_H
+
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/of.h>
+#include <linux/clk-provider.h>
+
+#define IPROC_CLK_NAME_LEN 25
+#define IPROC_CLK_INVALID_OFFSET 0xffffffff
+#define bit_mask(width) ((1 << (width)) - 1)
+
+/* clock should not be disabled at runtime */
+#define IPROC_CLK_AON BIT(0)
+
+/* PLL requires gating through ASIU */
+#define IPROC_CLK_PLL_ASIU BIT(1)
+
+/* PLL has fractional part of the NDIV */
+#define IPROC_CLK_PLL_HAS_NDIV_FRAC BIT(2)
+
+/*
+ * Parameters for VCO frequency configuration
+ *
+ * VCO frequency =
+ * ((ndiv_int + ndiv_frac / 2^20) * (ref freqeuncy  / pdiv)
+ */
+struct iproc_pll_vco_freq_param {
+	unsigned long rate;
+	unsigned int ndiv_int;
+	unsigned int ndiv_frac;
+	unsigned int pdiv;
+};
+
+struct iproc_clk_reg_op {
+	unsigned int offset;
+	unsigned int shift;
+	unsigned int width;
+};
+
+/*
+ * Clock gating control at the top ASIU level
+ */
+struct iproc_asiu_gate {
+	unsigned int offset;
+	unsigned int en_shift;
+};
+
+/*
+ * Control of powering on/off of a PLL
+ *
+ * Before powering off a PLL, input isolation (ISO) needs to be enabled
+ */
+struct iproc_pll_aon_pwr_ctrl {
+	unsigned int offset;
+	unsigned int pwr_width;
+	unsigned int pwr_shift;
+	unsigned int iso_shift;
+};
+
+/*
+ * Control of the PLL reset, with Ki, Kp, and Ka parameters
+ */
+struct iproc_pll_reset_ctrl {
+	unsigned int offset;
+	unsigned int reset_shift;
+	unsigned int p_reset_shift;
+	unsigned int ki_shift;
+	unsigned int ki_width;
+	unsigned int kp_shift;
+	unsigned int kp_width;
+	unsigned int ka_shift;
+	unsigned int ka_width;
+};
+
+struct iproc_pll_vco_ctrl {
+	unsigned int u_offset;
+	unsigned int l_offset;
+};
+
+/*
+ * Main PLL control parameters
+ */
+struct iproc_pll_ctrl {
+	unsigned long flags;
+	struct iproc_pll_aon_pwr_ctrl aon;
+	struct iproc_asiu_gate asiu;
+	struct iproc_pll_reset_ctrl reset;
+	struct iproc_clk_reg_op ndiv_int;
+	struct iproc_clk_reg_op ndiv_frac;
+	struct iproc_clk_reg_op pdiv;
+	struct iproc_pll_vco_ctrl vco_ctrl;
+	struct iproc_clk_reg_op status;
+};
+
+/*
+ * Controls enabling/disabling a PLL derived clock
+ */
+struct iproc_clk_enable_ctrl {
+	unsigned int offset;
+	unsigned int enable_shift;
+	unsigned int hold_shift;
+	unsigned int bypass_shift;
+};
+
+/*
+ * Main clock control parameters for clocks derived from the PLLs
+ */
+struct iproc_clk_ctrl {
+	unsigned int channel;
+	unsigned long flags;
+	struct iproc_clk_enable_ctrl enable;
+	struct iproc_clk_reg_op mdiv;
+};
+
+/*
+ * Divisor of the ASIU clocks
+ */
+struct iproc_asiu_div {
+	unsigned int offset;
+	unsigned int en_shift;
+	unsigned int high_shift;
+	unsigned int high_width;
+	unsigned int low_shift;
+	unsigned int low_width;
+};
+
+extern void __init iproc_armpll_setup(struct device_node *node);
+extern void __init iproc_pll_setup(struct device_node *node,
+		const struct iproc_pll_ctrl *ctrl,
+		const struct iproc_pll_vco_freq_param *vco_param,
+		unsigned int num_freqs);
+extern void __init iproc_clk_setup(struct device_node *node,
+		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks);
+extern void __init iproc_asiu_setup(struct device_node *node,
+		const struct iproc_asiu_div *div,
+		const struct iproc_asiu_gate *gate, unsigned int num_clks);
+
+#endif /* _CLK_IPROC_H */
-- 
1.7.9.5

[PATCH v4 2/5] clk: iproc: add initial common clock support

[Ray Jui]

This adds basic and generic support for various iProc PLLs and clocks
including the ARMPLL, GENPLL, LCPLL, MIPIPLL, and ASIU clocks.

SoCs under the iProc architecture can define their specific register
offsets and clock parameters for their PLL and clock controllers. These
parameters can be passed as arugments into the generic iProc PLL and
clock setup functions

Derived from code originally provided by Jonathan Richardson
<jonathar@broadcom.com>

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/clk/bcm/Kconfig            |    9 +
 drivers/clk/bcm/Makefile           |    1 +
 drivers/clk/bcm/clk-iproc-armpll.c |  282 +++++++++++++++++++++
 drivers/clk/bcm/clk-iproc-asiu.c   |  275 +++++++++++++++++++++
 drivers/clk/bcm/clk-iproc-clk.c    |  238 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-pll.c    |  478 ++++++++++++++++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc.h        |  155 ++++++++++++
 7 files changed, 1438 insertions(+)
 create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
 create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
 create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
 create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
 create mode 100644 drivers/clk/bcm/clk-iproc.h

diff --git a/drivers/clk/bcm/Kconfig b/drivers/clk/bcm/Kconfig
index 75506e5..66b5b7f 100644
--- a/drivers/clk/bcm/Kconfig
+++ b/drivers/clk/bcm/Kconfig
@@ -7,3 +7,12 @@ config CLK_BCM_KONA
 	  Enable common clock framework support for Broadcom SoCs
 	  using "Kona" style clock control units, including those
 	  in the BCM281xx and BCM21664 families.
+
+config COMMON_CLK_IPROC
+	bool "Broadcom iProc clock support"
+	depends on ARCH_BCM_IPROC
+	depends on COMMON_CLK
+	default y
+	help
+	  Enable common clock framework support for Broadcom SoCs
+	  based on the "iProc" architecture
diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
index 6297d05..6926636 100644
--- a/drivers/clk/bcm/Makefile
+++ b/drivers/clk/bcm/Makefile
@@ -2,3 +2,4 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
+obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
diff --git a/drivers/clk/bcm/clk-iproc-armpll.c b/drivers/clk/bcm/clk-iproc-armpll.c
new file mode 100644
index 0000000..965cd4e
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-armpll.c
@@ -0,0 +1,282 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+
+#define IPROC_CLK_MAX_FREQ_POLICY                    0x3
+#define IPROC_CLK_POLICY_FREQ_OFFSET                 0x008
+#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT      8
+#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK       0x7
+
+#define IPROC_CLK_PLLARMA_OFFSET                     0xc00
+#define IPROC_CLK_PLLARMA_LOCK_SHIFT                 28
+#define IPROC_CLK_PLLARMA_PDIV_SHIFT                 24
+#define IPROC_CLK_PLLARMA_PDIV_MASK                  0xf
+#define IPROC_CLK_PLLARMA_NDIV_INT_SHIFT             8
+#define IPROC_CLK_PLLARMA_NDIV_INT_MASK              0x3ff
+
+#define IPROC_CLK_PLLARMB_OFFSET                     0xc04
+#define IPROC_CLK_PLLARMB_NDIV_FRAC_MASK             0xfffff
+
+#define IPROC_CLK_PLLARMC_OFFSET                     0xc08
+#define IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT            8
+#define IPROC_CLK_PLLARMC_MDIV_MASK                  0xff
+
+#define IPROC_CLK_PLLARMCTL5_OFFSET                  0xc20
+#define IPROC_CLK_PLLARMCTL5_H_MDIV_MASK             0xff
+
+#define IPROC_CLK_PLLARM_OFFSET_OFFSET               0xc24
+#define IPROC_CLK_PLLARM_SW_CTL_SHIFT                29
+#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT       20
+#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK        0xff
+#define IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK       0xfffff
+
+#define IPROC_CLK_ARM_DIV_OFFSET                     0xe00
+#define IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT  4
+#define IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK        0xf
+
+#define IPROC_CLK_POLICY_DBG_OFFSET                  0xec0
+#define IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT          12
+#define IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK           0x7
+
+enum iproc_arm_pll_fid {
+	ARM_PLL_FID_CRYSTAL_CLK   = 0,
+	ARM_PLL_FID_SYS_CLK       = 2,
+	ARM_PLL_FID_CH0_SLOW_CLK  = 6,
+	ARM_PLL_FID_CH1_FAST_CLK  = 7
+};
+
+struct iproc_arm_pll {
+	struct clk_hw hw;
+	void __iomem *base;
+	unsigned long rate;
+};
+
+#define to_iproc_arm_pll(hw) container_of(hw, struct iproc_arm_pll, hw)
+
+static unsigned int __get_fid(struct iproc_arm_pll *pll)
+{
+	u32 val;
+	unsigned int policy, fid, active_fid;
+
+	val = readl(pll->base + IPROC_CLK_ARM_DIV_OFFSET);
+	if (val & (1 << IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT))
+		policy = val & IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK;
+	else
+		policy = 0;
+
+	/* something is seriously wrong */
+	BUG_ON(policy > IPROC_CLK_MAX_FREQ_POLICY);
+
+	val = readl(pll->base + IPROC_CLK_POLICY_FREQ_OFFSET);
+	fid = (val >> (IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT * policy)) &
+		IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK;
+
+	val = readl(pll->base + IPROC_CLK_POLICY_DBG_OFFSET);
+	active_fid = IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK &
+		(val >> IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT);
+	if (fid != active_fid) {
+		pr_debug("%s: fid override %u->%u\n", __func__,	fid,
+				active_fid);
+		fid = active_fid;
+	}
+
+	pr_debug("%s: active fid: %u\n", __func__, fid);
+
+	return fid;
+}
+
+/*
+ * Determine the mdiv (post divider) based on the frequency ID being used.
+ * There are 4 sources that can be used to derive the output clock rate:
+ *    - 25 MHz Crystal
+ *    - System clock
+ *    - PLL channel 0 (slow clock)
+ *    - PLL channel 1 (fast clock)
+ */
+static int __get_mdiv(struct iproc_arm_pll *pll)
+{
+	unsigned int fid;
+	int mdiv;
+	u32 val;
+
+	fid = __get_fid(pll);
+
+	switch (fid) {
+	case ARM_PLL_FID_CRYSTAL_CLK:
+	case ARM_PLL_FID_SYS_CLK:
+		mdiv = 1;
+		break;
+
+	case ARM_PLL_FID_CH0_SLOW_CLK:
+		val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
+		mdiv = val & IPROC_CLK_PLLARMC_MDIV_MASK;
+		if (mdiv == 0)
+			mdiv = 256;
+		break;
+
+	case ARM_PLL_FID_CH1_FAST_CLK:
+		val = readl(pll->base +	IPROC_CLK_PLLARMCTL5_OFFSET);
+		mdiv = val & IPROC_CLK_PLLARMCTL5_H_MDIV_MASK;
+		if (mdiv == 0)
+			mdiv = 256;
+		break;
+
+	default:
+		mdiv = -EFAULT;
+	}
+
+	return mdiv;
+}
+
+static unsigned int __get_ndiv(struct iproc_arm_pll *pll)
+{
+	u32 val;
+	unsigned int ndiv_int, ndiv_frac, ndiv;
+
+	val = readl(pll->base + IPROC_CLK_PLLARM_OFFSET_OFFSET);
+	if (val & (1 << IPROC_CLK_PLLARM_SW_CTL_SHIFT)) {
+		/*
+		 * offset mode is active. Read the ndiv from the PLLARM OFFSET
+		 * register
+		 */
+		ndiv_int = (val >> IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT) &
+			IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK;
+		if (ndiv_int == 0)
+			ndiv_int = 256;
+
+		ndiv_frac = val & IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK;
+	} else {
+		/* offset mode not active */
+		val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
+		ndiv_int = (val >> IPROC_CLK_PLLARMA_NDIV_INT_SHIFT) &
+			IPROC_CLK_PLLARMA_NDIV_INT_MASK;
+		if (ndiv_int == 0)
+			ndiv_int = 1024;
+
+		val = readl(pll->base + IPROC_CLK_PLLARMB_OFFSET);
+		ndiv_frac = val & IPROC_CLK_PLLARMB_NDIV_FRAC_MASK;
+	}
+
+	ndiv = (ndiv_int << 20) | ndiv_frac;
+
+	return ndiv;
+}
+
+/*
+ * The output frequency of the ARM PLL is calculated based on the ARM PLL
+ * divider values:
+ *   pdiv = ARM PLL pre-divider
+ *   ndiv = ARM PLL multiplier
+ *   mdiv = ARM PLL post divider
+ *
+ * The frequency is calculated by:
+ *   ((ndiv * parent clock rate) / pdiv) / mdiv
+ */
+static unsigned long iproc_arm_pll_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_arm_pll *pll = to_iproc_arm_pll(hw);
+	u32 val;
+	int mdiv;
+	u64 ndiv;
+	unsigned int pdiv;
+
+	/* in bypass mode, use parent rate */
+	val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
+	if (val & (1 << IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT)) {
+		pll->rate = parent_rate;
+		return pll->rate;
+	}
+
+	/* PLL needs to be locked */
+	val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
+	if (!(val & (1 << IPROC_CLK_PLLARMA_LOCK_SHIFT))) {
+		pll->rate = 0;
+		return 0;
+	}
+
+	pdiv = (val >> IPROC_CLK_PLLARMA_PDIV_SHIFT) &
+		IPROC_CLK_PLLARMA_PDIV_MASK;
+	if (pdiv == 0)
+		pdiv = 16;
+
+	ndiv = __get_ndiv(pll);
+	mdiv = __get_mdiv(pll);
+	if (mdiv <= 0) {
+		pll->rate = 0;
+		return 0;
+	}
+	pll->rate = (ndiv * parent_rate) >> 20;
+	pll->rate = (pll->rate / pdiv) / mdiv;
+
+	pr_debug("%s: ARM PLL rate: %lu. parent rate: %lu\n", __func__,
+			pll->rate, parent_rate);
+	pr_debug("%s: ndiv_int: %u, pdiv: %u, mdiv: %d\n", __func__,
+			(unsigned int)(ndiv >> 20), pdiv, mdiv);
+
+	return pll->rate;
+}
+
+static const struct clk_ops iproc_arm_pll_ops = {
+	.recalc_rate = iproc_arm_pll_recalc_rate,
+};
+
+void __init iproc_armpll_setup(struct device_node *node)
+{
+	int ret;
+	struct clk *clk;
+	struct iproc_arm_pll *pll;
+	struct clk_init_data init;
+	const char *parent_name;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->base = of_iomap(node, 0);
+	if (WARN_ON(!pll->base))
+		goto err_free_pll;
+
+	init.name = node->name;
+	init.ops = &iproc_arm_pll_ops;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	pll->hw.init = &init;
+
+	clk = clk_register(NULL, &pll->hw);
+	if (WARN_ON(IS_ERR(clk)))
+		goto err_iounmap;
+
+	ret = of_clk_add_provider(node, of_clk_src_simple_get, clk);
+	if (WARN_ON(ret))
+		goto err_clk_unregister;
+
+	return;
+
+err_clk_unregister:
+	clk_unregister(clk);
+err_iounmap:
+	iounmap(pll->base);
+err_free_pll:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc-asiu.c b/drivers/clk/bcm/clk-iproc-asiu.c
new file mode 100644
index 0000000..ab86b8c
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-asiu.c
@@ -0,0 +1,275 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+struct iproc_asiu;
+
+struct iproc_asiu_clk {
+	struct clk_hw hw;
+	const char *name;
+	struct iproc_asiu *asiu;
+	unsigned long rate;
+	struct iproc_asiu_div div;
+	struct iproc_asiu_gate gate;
+};
+
+struct iproc_asiu {
+	void __iomem *div_base;
+	void __iomem *gate_base;
+
+	struct clk_onecell_data clk_data;
+	struct iproc_asiu_clk *clks;
+};
+
+#define to_asiu_clk(hw) container_of(hw, struct iproc_asiu_clk, hw)
+
+static int iproc_asiu_clk_enable(struct clk_hw *hw)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+
+	/* some clocks at the ASIU level are always enabled */
+	if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
+		return 0;
+
+	val = readl(asiu->gate_base + clk->gate.offset);
+	val |= (1 << clk->gate.en_shift);
+	writel(val, asiu->gate_base + clk->gate.offset);
+
+	return 0;
+}
+
+static void iproc_asiu_clk_disable(struct clk_hw *hw)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+
+	/* some clocks at the ASIU level are always enabled */
+	if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
+		return;
+
+	val = readl(asiu->gate_base + clk->gate.offset);
+	val &= ~(1 << clk->gate.en_shift);
+	writel(val, asiu->gate_base + clk->gate.offset);
+}
+
+static unsigned long iproc_asiu_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+	unsigned int div_h, div_l;
+
+	if (parent_rate == 0) {
+		clk->rate = 0;
+		return 0;
+	}
+
+	/* if clock divisor is not enabled, simply return parent rate */
+	val = readl(asiu->div_base + clk->div.offset);
+	if ((val & (1 << clk->div.en_shift)) == 0) {
+		clk->rate = parent_rate;
+		return parent_rate;
+	}
+
+	/* clock rate = parent rate / (high_div + 1) + (low_div + 1) */
+	div_h = (val >> clk->div.high_shift) & bit_mask(clk->div.high_width);
+	div_h++;
+	div_l = (val >> clk->div.low_shift) & bit_mask(clk->div.low_width);
+	div_l++;
+
+	clk->rate = parent_rate / (div_h + div_l);
+	pr_debug("%s: rate: %lu. parent rate: %lu div_h: %u div_l: %u\n",
+		__func__, clk->rate, parent_rate, div_h, div_l);
+
+	return clk->rate;
+}
+
+static long iproc_asiu_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	unsigned int div;
+
+	if (rate == 0 || *parent_rate == 0)
+		return -EINVAL;
+
+	if (rate == *parent_rate)
+		return *parent_rate;
+
+	div = DIV_ROUND_UP(*parent_rate, rate);
+	if (div < 2)
+		return *parent_rate;
+
+	return *parent_rate / div;
+}
+
+static int iproc_asiu_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	unsigned int div, div_h, div_l;
+	u32 val;
+
+	if (rate == 0 || parent_rate == 0)
+		return -EINVAL;
+
+	/* simply disable the divisor if one wants the same rate as parent */
+	if (rate == parent_rate) {
+		val = readl(asiu->div_base + clk->div.offset);
+		val &= ~(1 << clk->div.en_shift);
+		writel(val, asiu->div_base + clk->div.offset);
+		return 0;
+	}
+
+	div = DIV_ROUND_UP(parent_rate, rate);
+	if (div < 2)
+		return -EINVAL;
+
+	div_h = div_l = div >> 1;
+	div_h--;
+	div_l--;
+
+	val = readl(asiu->div_base + clk->div.offset);
+	val |= 1 << clk->div.en_shift;
+	if (div_h) {
+		val &= ~(bit_mask(clk->div.high_width)
+				<< clk->div.high_shift);
+		val |= div_h << clk->div.high_shift;
+	} else {
+		val &= ~(bit_mask(clk->div.high_width)
+				<< clk->div.high_shift);
+	}
+	if (div_l) {
+		val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
+		val |= div_l << clk->div.low_shift;
+	} else {
+		val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
+	}
+	writel(val, asiu->div_base + clk->div.offset);
+
+	return 0;
+}
+
+static const struct clk_ops iproc_asiu_ops = {
+	.enable = iproc_asiu_clk_enable,
+	.disable = iproc_asiu_clk_disable,
+	.recalc_rate = iproc_asiu_clk_recalc_rate,
+	.round_rate = iproc_asiu_clk_round_rate,
+	.set_rate = iproc_asiu_clk_set_rate,
+};
+
+void __init iproc_asiu_setup(struct device_node *node,
+		const struct iproc_asiu_div *div,
+		const struct iproc_asiu_gate *gate, unsigned int num_clks)
+{
+	int i, ret;
+	struct iproc_asiu *asiu;
+
+	if (WARN_ON(!gate || !div))
+		return;
+
+	asiu = kzalloc(sizeof(*asiu), GFP_KERNEL);
+	if (WARN_ON(!asiu))
+		return;
+
+	asiu->clk_data.clk_num = num_clks;
+	asiu->clk_data.clks = kcalloc(num_clks, sizeof(*asiu->clk_data.clks),
+			GFP_KERNEL);
+	if (WARN_ON(!asiu->clk_data.clks))
+		goto err_clks;
+
+	asiu->clks = kcalloc(num_clks, sizeof(*asiu->clks), GFP_KERNEL);
+	if (WARN_ON(!asiu->clks))
+		goto err_asiu_clks;
+
+	asiu->div_base = of_iomap(node, 0);
+	if (WARN_ON(!asiu->div_base))
+		goto err_iomap_div;
+
+	asiu->gate_base = of_iomap(node, 1);
+	if (WARN_ON(!asiu->gate_base))
+		goto err_iomap_gate;
+
+	for (i = 0; i < num_clks; i++) {
+		struct clk_init_data init;
+		struct clk *clk;
+		const char *parent_name;
+		struct iproc_asiu_clk *asiu_clk;
+		const char *clk_name;
+
+		clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
+		if (WARN_ON(!clk_name))
+			goto err_clk_register;
+
+		ret = of_property_read_string_index(node, "clock-output-names",
+				i, &clk_name);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+
+		asiu_clk = &asiu->clks[i];
+		asiu_clk->name = clk_name;
+		asiu_clk->asiu = asiu;
+		asiu_clk->div = div[i];
+		asiu_clk->gate = gate[i];
+		init.name = clk_name;
+		init.ops = &iproc_asiu_ops;
+		init.flags = 0;
+		parent_name = of_clk_get_parent_name(node, 0);
+		init.parent_names = (parent_name ? &parent_name : NULL);
+		init.num_parents = (parent_name ? 1 : 0);
+		asiu_clk->hw.init = &init;
+
+		clk = clk_register(NULL, &asiu_clk->hw);
+		if (WARN_ON(IS_ERR(clk)))
+			goto err_clk_register;
+		asiu->clk_data.clks[i] = clk;
+	}
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get,
+			&asiu->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_register;
+
+	return;
+
+err_clk_register:
+	for (i = 0; i < num_clks; i++)
+		kfree(asiu->clks[i].name);
+	iounmap(asiu->gate_base);
+
+err_iomap_gate:
+	iounmap(asiu->div_base);
+
+err_iomap_div:
+	kfree(asiu->clks);
+
+err_asiu_clks:
+	kfree(asiu->clk_data.clks);
+
+err_clks:
+	kfree(asiu);
+}
diff --git a/drivers/clk/bcm/clk-iproc-clk.c b/drivers/clk/bcm/clk-iproc-clk.c
new file mode 100644
index 0000000..be3c42c
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-clk.c
@@ -0,0 +1,238 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+struct iproc_pll;
+
+struct iproc_clk {
+	struct clk_hw hw;
+	const char *name;
+	struct iproc_pll *pll;
+	unsigned long rate;
+	const struct iproc_clk_ctrl *ctrl;
+};
+
+struct iproc_pll {
+	void __iomem *base;
+	struct clk_onecell_data clk_data;
+	struct iproc_clk *clks;
+};
+
+#define to_iproc_clk(hw) container_of(hw, struct iproc_clk, hw)
+
+static int iproc_clk_enable(struct clk_hw *hw)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+
+	/* channel enable is active low */
+	val = readl(pll->base + ctrl->enable.offset);
+	val &= ~(1 << ctrl->enable.enable_shift);
+	writel(val, pll->base + ctrl->enable.offset);
+
+	/* also make sure channel is not held */
+	val = readl(pll->base + ctrl->enable.offset);
+	val &= ~(1 << ctrl->enable.hold_shift);
+	writel(val, pll->base + ctrl->enable.offset);
+
+	return 0;
+}
+
+static void iproc_clk_disable(struct clk_hw *hw)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+
+	if (ctrl->flags & IPROC_CLK_AON)
+		return;
+
+	val = readl(pll->base + ctrl->enable.offset);
+	val |= 1 << ctrl->enable.enable_shift;
+	writel(val, pll->base + ctrl->enable.offset);
+}
+
+static unsigned long iproc_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+	unsigned int mdiv;
+
+	if (parent_rate == 0)
+		return 0;
+
+	val = readl(pll->base + ctrl->mdiv.offset);
+	mdiv = (val >> ctrl->mdiv.shift) & bit_mask(ctrl->mdiv.width);
+	if (mdiv == 0)
+		mdiv = 256;
+
+	clk->rate = parent_rate / mdiv;
+
+	return clk->rate;
+}
+
+static long iproc_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	unsigned int div;
+
+	if (rate == 0 || *parent_rate == 0)
+		return -EINVAL;
+
+	if (rate == *parent_rate)
+		return *parent_rate;
+
+	div = DIV_ROUND_UP(*parent_rate, rate);
+	if (div < 2)
+		return *parent_rate;
+
+	if (div > 256)
+		div = 256;
+
+	return *parent_rate / div;
+}
+
+static int iproc_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+	unsigned int div;
+
+	if (rate == 0 || parent_rate == 0)
+		return -EINVAL;
+
+	div = DIV_ROUND_UP(parent_rate, rate);
+	if (div > 256)
+		return -EINVAL;
+
+	val = readl(pll->base + ctrl->mdiv.offset);
+	if (div == 256) {
+		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
+	} else {
+		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
+		val |= div << ctrl->mdiv.shift;
+	}
+	writel(val, pll->base + ctrl->mdiv.offset);
+	clk->rate = parent_rate / div;
+
+	return 0;
+}
+
+static const struct clk_ops iproc_clk_ops = {
+	.enable = iproc_clk_enable,
+	.disable = iproc_clk_disable,
+	.recalc_rate = iproc_clk_recalc_rate,
+	.round_rate = iproc_clk_round_rate,
+	.set_rate = iproc_clk_set_rate,
+};
+
+void __init iproc_clk_setup(struct device_node *node,
+		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks)
+{
+	int i, ret;
+	struct iproc_pll *pll;
+
+	if (WARN_ON(!ctrl))
+		return;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->clk_data.clk_num = num_clks;
+	pll->clk_data.clks = kcalloc(num_clks, sizeof(*pll->clk_data.clks),
+			GFP_KERNEL);
+	if (WARN_ON(!pll->clk_data.clks))
+		goto err_clks;
+
+	pll->clks = kcalloc(num_clks, sizeof(*pll->clks), GFP_KERNEL);
+	if (WARN_ON(!pll->clks))
+		goto err_pll_clks;
+
+	pll->base = of_iomap(node, 0);
+	if (WARN_ON(!pll->base))
+		goto err_iomap;
+
+	for (i = 0; i < num_clks; i++) {
+		struct clk_init_data init;
+		struct clk *clk;
+		const char *parent_name;
+		struct iproc_clk *iclk;
+		const char *clk_name;
+
+		clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
+		if (WARN_ON(!clk_name))
+			goto err_clk_register;
+
+		ret = of_property_read_string_index(node, "clock-output-names",
+				i, &clk_name);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+
+		iclk = &pll->clks[i];
+		iclk->name = clk_name;
+		iclk->pll = pll;
+		iclk->ctrl = &ctrl[i];
+		init.name = clk_name;
+		init.ops = &iproc_clk_ops;
+		init.flags = 0;
+		parent_name = of_clk_get_parent_name(node, 0);
+		init.parent_names = (parent_name ? &parent_name : NULL);
+		init.num_parents = (parent_name ? 1 : 0);
+		iclk->hw.init = &init;
+
+		clk = clk_register(NULL, &iclk->hw);
+		if (WARN_ON(IS_ERR(clk)))
+			goto err_clk_register;
+		pll->clk_data.clks[i] = clk;
+	}
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_register;
+
+	return;
+
+err_clk_register:
+	for (i = 0; i < num_clks; i++)
+		kfree(pll->clks[i].name);
+	iounmap(pll->base);
+
+err_iomap:
+	kfree(pll->clks);
+
+err_pll_clks:
+	kfree(pll->clk_data.clks);
+
+err_clks:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc-pll.c b/drivers/clk/bcm/clk-iproc-pll.c
new file mode 100644
index 0000000..a4d98b6
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-pll.c
@@ -0,0 +1,478 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+#define PLL_VCO_HIGH_SHIFT 19
+#define PLL_VCO_LOW_SHIFT  30
+
+/* number of delay loops waiting for PLL to lock */
+#define LOCK_DELAY 100
+
+/* number of VCO frequency bands */
+#define NUM_FREQ_BANDS 8
+
+#define NUM_KP_BANDS 3
+enum kp_band {
+	KP_BAND_MID = 0,
+	KP_BAND_HIGH,
+	KP_BAND_HIGH_HIGH
+};
+
+static const unsigned int kp_table[NUM_KP_BANDS][NUM_FREQ_BANDS] = {
+	{ 5, 6, 6, 7, 7, 8, 9, 10 },
+	{ 4, 4, 5, 5, 6, 7, 8, 9  },
+	{ 4, 5, 5, 6, 7, 8, 9, 10 },
+};
+
+static const unsigned long ref_freq_table[NUM_FREQ_BANDS][2] = {
+	{ 10000000,  12500000  },
+	{ 12500000,  15000000  },
+	{ 15000000,  20000000  },
+	{ 20000000,  25000000  },
+	{ 25000000,  50000000  },
+	{ 50000000,  75000000  },
+	{ 75000000,  100000000 },
+	{ 100000000, 125000000 },
+};
+
+enum vco_freq_range {
+	VCO_LOW       = 700000000U,
+	VCO_MID       = 1200000000U,
+	VCO_HIGH      = 2200000000U,
+	VCO_HIGH_HIGH = 3100000000U,
+	VCO_MAX       = 4000000000U,
+};
+
+struct iproc_pll {
+	struct clk_hw hw;
+	void __iomem *pll_base;
+	void __iomem *pwr_base;
+	void __iomem *asiu_base;
+	const char *name;
+	const struct iproc_pll_ctrl *ctrl;
+	const struct iproc_pll_vco_freq_param *vco_param;
+	unsigned int num_vco_entries;
+	unsigned long rate;
+};
+
+#define to_iproc_pll(hw) container_of(hw, struct iproc_pll, hw)
+
+/*
+ * Get the clock rate based on name
+ */
+static unsigned long __get_rate(const char *clk_name)
+{
+	struct clk *clk;
+
+	clk = __clk_lookup(clk_name);
+	if (!clk) {
+		pr_err("%s: unable to find clock by name: %s\n", __func__,
+				clk_name);
+		return 0;
+	}
+
+	return clk_get_rate(clk);
+}
+
+/*
+ * Based on the target frequency, find a match from the VCO frequency parameter
+ * table and return its index
+ */
+static int pll_get_rate_index(struct iproc_pll *pll, unsigned int target_rate)
+{
+	int i;
+
+	for (i = 0; i < pll->num_vco_entries; i++)
+		if (target_rate == pll->vco_param[i].rate)
+			break;
+
+	if (i >= pll->num_vco_entries)
+		return -EINVAL;
+
+	return i;
+}
+
+static int get_kp(unsigned long ref_freq, enum kp_band kp_index)
+{
+	int i;
+
+	if (ref_freq < ref_freq_table[0][0])
+		return -EINVAL;
+
+	for (i = 0; i < NUM_FREQ_BANDS; i++) {
+		if (ref_freq >= ref_freq_table[i][0] &&
+			ref_freq < ref_freq_table[i][1])
+			return kp_table[kp_index][i];
+	}
+	return -EINVAL;
+}
+
+static int pll_wait_for_lock(struct iproc_pll *pll)
+{
+	int i;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+
+	for (i = 0; i < LOCK_DELAY; i++) {
+		u32 val = readl(pll->pll_base + ctrl->status.offset);
+
+		if (val & (1 << ctrl->status.shift))
+			return 0;
+		udelay(10);
+	}
+
+	return -EIO;
+}
+
+static void __pll_disable(struct iproc_pll *pll)
+{
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		val = readl(pll->asiu_base + ctrl->asiu.offset);
+		val &= ~(1 << ctrl->asiu.en_shift);
+		writel(val, pll->asiu_base + ctrl->asiu.offset);
+	}
+
+	/* latch input value so core power can be shut down */
+	val = readl(pll->pwr_base + ctrl->aon.offset);
+	val |= (1 << ctrl->aon.iso_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+
+	/* power down the core */
+	val &= ~(bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+}
+
+static int __pll_enable(struct iproc_pll *pll)
+{
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+
+	/* power up the PLL and make sure it's not latched */
+	val = readl(pll->pwr_base + ctrl->aon.offset);
+	val |= bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift;
+	val &= ~(1 << ctrl->aon.iso_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+
+	/* certain PLLs also need to be ungated from the ASIU top level */
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		val = readl(pll->asiu_base + ctrl->asiu.offset);
+		val |= (1 << ctrl->asiu.en_shift);
+		writel(val, pll->asiu_base + ctrl->asiu.offset);
+	}
+
+	return 0;
+}
+
+static void __pll_put_in_reset(struct iproc_pll *pll)
+{
+	u32 val;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
+
+	val = readl(pll->pll_base + reset->offset);
+	val &= ~(1 << reset->reset_shift | 1 << reset->p_reset_shift);
+	writel(val, pll->pll_base + reset->offset);
+}
+
+static void __pll_bring_out_reset(struct iproc_pll *pll, unsigned int kp,
+		unsigned int ka, unsigned int ki)
+{
+	u32 val;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
+
+	val = readl(pll->pll_base + reset->offset);
+	val &= ~(bit_mask(reset->ki_width) << reset->ki_shift |
+		bit_mask(reset->kp_width) << reset->kp_shift |
+		bit_mask(reset->ka_width) << reset->ka_shift);
+	val |=  ki << reset->ki_shift | kp << reset->kp_shift |
+		ka << reset->ka_shift;
+	val |= 1 << reset->reset_shift | 1 << reset->p_reset_shift;
+	writel(val, pll->pll_base + reset->offset);
+}
+
+static int pll_set_rate(struct iproc_pll *pll, unsigned int rate_index,
+		unsigned long parent_rate)
+{
+	const struct iproc_pll_vco_freq_param *vco =
+				&pll->vco_param[rate_index];
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	int ka = 0, ki, kp, ret;
+	unsigned long rate = vco->rate;
+	u32 val;
+	enum kp_band kp_index;
+	unsigned long ref_freq;
+
+	/*
+	 * reference frequency = parent frequency / PDIV
+	 * If PDIV = 0, then it becomes a multiplier (x2)
+	 */
+	if (vco->pdiv == 0)
+		ref_freq = parent_rate * 2;
+	else
+		ref_freq = parent_rate / vco->pdiv;
+
+	/* determine Ki and Kp index based on target VCO frequency */
+	if (rate >= VCO_LOW && rate < VCO_HIGH) {
+		ki = 4;
+		kp_index = KP_BAND_MID;
+	} else if (rate >= VCO_HIGH && rate && rate < VCO_HIGH_HIGH) {
+		ki = 3;
+		kp_index = KP_BAND_HIGH;
+	} else if (rate >= VCO_HIGH_HIGH && rate < VCO_MAX) {
+		ki = 3;
+		kp_index = KP_BAND_HIGH_HIGH;
+	} else {
+		pr_err("%s: pll: %s has invalid rate: %lu\n", __func__,
+				pll->name, rate);
+		return -EINVAL;
+	}
+
+	kp = get_kp(ref_freq, kp_index);
+	if (kp < 0) {
+		pr_err("%s: pll: %s has invalid kp\n", __func__, pll->name);
+		return kp;
+	}
+
+	ret = __pll_enable(pll);
+	if (ret) {
+		pr_err("%s: pll: %s fails to enable\n", __func__, pll->name);
+		return ret;
+	}
+
+	/* put PLL in reset */
+	__pll_put_in_reset(pll);
+
+	writel(0, pll->pll_base + ctrl->vco_ctrl.u_offset);
+	val = readl(pll->pll_base + ctrl->vco_ctrl.l_offset);
+
+	if (rate >= VCO_LOW && rate < VCO_MID)
+		val |= (1 << PLL_VCO_LOW_SHIFT);
+
+	if (rate < VCO_HIGH)
+		val &= ~(1 << PLL_VCO_HIGH_SHIFT);
+	else
+		val |= (1 << PLL_VCO_HIGH_SHIFT);
+
+	writel(val, pll->pll_base + ctrl->vco_ctrl.l_offset);
+
+	/* program integer part of NDIV */
+	val = readl(pll->pll_base + ctrl->ndiv_int.offset);
+	val &= ~(bit_mask(ctrl->ndiv_int.width) << ctrl->ndiv_int.shift);
+	val |= vco->ndiv_int << ctrl->ndiv_int.shift;
+	writel(val, pll->pll_base + ctrl->ndiv_int.offset);
+
+	/* program fractional part of NDIV */
+	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
+		val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
+		val &= ~(bit_mask(ctrl->ndiv_frac.width) <<
+				ctrl->ndiv_frac.shift);
+		val |= vco->ndiv_frac << ctrl->ndiv_frac.shift;
+		writel(val, pll->pll_base + ctrl->ndiv_frac.offset);
+	}
+
+	/* program PDIV */
+	val = readl(pll->pll_base + ctrl->pdiv.offset);
+	val &= ~(bit_mask(ctrl->pdiv.width) << ctrl->pdiv.shift);
+	val |= vco->pdiv << ctrl->pdiv.shift;
+	writel(val, pll->pll_base + ctrl->pdiv.offset);
+
+	__pll_bring_out_reset(pll, kp, ka, ki);
+
+	ret = pll_wait_for_lock(pll);
+	if (ret < 0) {
+		pr_err("%s: pll: %s failed to lock\n", __func__, pll->name);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int iproc_pll_enable(struct clk_hw *hw)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+
+	return __pll_enable(pll);
+}
+
+static void iproc_pll_disable(struct clk_hw *hw)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+
+	if (ctrl->flags & IPROC_CLK_AON)
+		return;
+
+	__pll_disable(pll);
+}
+
+static unsigned long iproc_pll_recalc_rate(struct clk_hw *hw,
+	unsigned long parent_rate)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+	u64 ndiv;
+	unsigned int ndiv_int, ndiv_frac, pdiv;
+
+	if (parent_rate == 0)
+		return 0;
+
+	/* PLL needs to be locked */
+	val = readl(pll->pll_base + ctrl->status.offset);
+	if ((val & (1 << ctrl->status.shift)) == 0) {
+		pll->rate = 0;
+		return 0;
+	}
+
+	/*
+	 * PLL output frequency =
+	 *
+	 * ((ndiv_int + ndiv_frac / 2^20) * (parent clock rate / pdiv)
+	 */
+	val = readl(pll->pll_base + ctrl->ndiv_int.offset);
+	ndiv_int = (val >> ctrl->ndiv_int.shift) &
+		bit_mask(ctrl->ndiv_int.width);
+	ndiv = ndiv_int << ctrl->ndiv_int.shift;
+
+	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
+		val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
+		ndiv_frac = (val >> ctrl->ndiv_frac.shift) &
+			bit_mask(ctrl->ndiv_frac.width);
+
+		if (ndiv_frac != 0)
+			ndiv = (ndiv_int << ctrl->ndiv_int.shift) | ndiv_frac;
+	}
+
+	val = readl(pll->pll_base + ctrl->pdiv.offset);
+	pdiv = (val >> ctrl->pdiv.shift) & bit_mask(ctrl->pdiv.width);
+
+	pll->rate = (ndiv * parent_rate) >> ctrl->ndiv_int.shift;
+
+	if (pdiv == 0)
+		pll->rate *= 2;
+	else
+		pll->rate /= pdiv;
+
+	return pll->rate;
+}
+
+static const struct clk_ops iproc_pll_ops = {
+	.enable = iproc_pll_enable,
+	.disable = iproc_pll_disable,
+	.recalc_rate = iproc_pll_recalc_rate,
+};
+
+void __init iproc_pll_setup(struct device_node *node,
+		const struct iproc_pll_ctrl *ctrl,
+		const struct iproc_pll_vco_freq_param *vco_param,
+		unsigned int num_vco_entries)
+{
+	int ret;
+	struct clk *clk;
+	struct iproc_pll *pll;
+	struct clk_init_data init;
+	const char *parent_name;
+	unsigned int rate;
+
+	if (WARN_ON(!ctrl))
+		return;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->pll_base = of_iomap(node, 0);
+	if (WARN_ON(!pll->pll_base))
+		goto err_pll_iomap;
+
+	pll->pwr_base = of_iomap(node, 1);
+	if (WARN_ON(!pll->pwr_base))
+		goto err_pwr_iomap;
+
+	/* some PLLs require gating control at the top ASIU level */
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		pll->asiu_base = of_iomap(node, 2);
+		if (WARN_ON(!pll->asiu_base))
+			goto err_asiu_iomap;
+	}
+
+	pll->ctrl = ctrl;
+	pll->name = node->name;
+	init.name = node->name;
+	init.ops = &iproc_pll_ops;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	pll->hw.init = &init;
+
+	/* configure the PLL to the desired VCO frequency if specified */
+	ret = of_property_read_u32(node, "clock-frequency", &rate);
+	if (!ret) {
+		unsigned long parent_rate;
+		int rate_index;
+
+		if (WARN_ON(!vco_param))
+			goto err_clk_register;
+
+		pll->num_vco_entries = num_vco_entries;
+		pll->vco_param = vco_param;
+
+		parent_rate = __get_rate(parent_name);
+		if (WARN_ON(!parent_rate))
+			goto err_clk_register;
+
+		rate_index = pll_get_rate_index(pll, rate);
+		if (WARN_ON(rate_index < 0))
+			goto err_clk_register;
+
+		ret = pll_set_rate(pll, rate_index, parent_rate);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+	}
+
+	clk = clk_register(NULL, &pll->hw);
+	if (WARN_ON(IS_ERR(clk)))
+		goto err_clk_register;
+
+	ret = of_clk_add_provider(node, of_clk_src_simple_get, clk);
+	if (WARN_ON(ret))
+		goto err_clk_add;
+
+	return;
+
+err_clk_add:
+	clk_unregister(clk);
+err_clk_register:
+	if (pll->asiu_base)
+		iounmap(pll->asiu_base);
+err_asiu_iomap:
+	iounmap(pll->pwr_base);
+err_pwr_iomap:
+	iounmap(pll->pll_base);
+err_pll_iomap:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc.h b/drivers/clk/bcm/clk-iproc.h
new file mode 100644
index 0000000..4aa0479
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc.h
@@ -0,0 +1,155 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _CLK_IPROC_H
+#define _CLK_IPROC_H
+
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/of.h>
+#include <linux/clk-provider.h>
+
+#define IPROC_CLK_NAME_LEN 25
+#define IPROC_CLK_INVALID_OFFSET 0xffffffff
+#define bit_mask(width) ((1 << (width)) - 1)
+
+/* clock should not be disabled at runtime */
+#define IPROC_CLK_AON BIT(0)
+
+/* PLL requires gating through ASIU */
+#define IPROC_CLK_PLL_ASIU BIT(1)
+
+/* PLL has fractional part of the NDIV */
+#define IPROC_CLK_PLL_HAS_NDIV_FRAC BIT(2)
+
+/*
+ * Parameters for VCO frequency configuration
+ *
+ * VCO frequency =
+ * ((ndiv_int + ndiv_frac / 2^20) * (ref freqeuncy  / pdiv)
+ */
+struct iproc_pll_vco_freq_param {
+	unsigned long rate;
+	unsigned int ndiv_int;
+	unsigned int ndiv_frac;
+	unsigned int pdiv;
+};
+
+struct iproc_clk_reg_op {
+	unsigned int offset;
+	unsigned int shift;
+	unsigned int width;
+};
+
+/*
+ * Clock gating control@the top ASIU level
+ */
+struct iproc_asiu_gate {
+	unsigned int offset;
+	unsigned int en_shift;
+};
+
+/*
+ * Control of powering on/off of a PLL
+ *
+ * Before powering off a PLL, input isolation (ISO) needs to be enabled
+ */
+struct iproc_pll_aon_pwr_ctrl {
+	unsigned int offset;
+	unsigned int pwr_width;
+	unsigned int pwr_shift;
+	unsigned int iso_shift;
+};
+
+/*
+ * Control of the PLL reset, with Ki, Kp, and Ka parameters
+ */
+struct iproc_pll_reset_ctrl {
+	unsigned int offset;
+	unsigned int reset_shift;
+	unsigned int p_reset_shift;
+	unsigned int ki_shift;
+	unsigned int ki_width;
+	unsigned int kp_shift;
+	unsigned int kp_width;
+	unsigned int ka_shift;
+	unsigned int ka_width;
+};
+
+struct iproc_pll_vco_ctrl {
+	unsigned int u_offset;
+	unsigned int l_offset;
+};
+
+/*
+ * Main PLL control parameters
+ */
+struct iproc_pll_ctrl {
+	unsigned long flags;
+	struct iproc_pll_aon_pwr_ctrl aon;
+	struct iproc_asiu_gate asiu;
+	struct iproc_pll_reset_ctrl reset;
+	struct iproc_clk_reg_op ndiv_int;
+	struct iproc_clk_reg_op ndiv_frac;
+	struct iproc_clk_reg_op pdiv;
+	struct iproc_pll_vco_ctrl vco_ctrl;
+	struct iproc_clk_reg_op status;
+};
+
+/*
+ * Controls enabling/disabling a PLL derived clock
+ */
+struct iproc_clk_enable_ctrl {
+	unsigned int offset;
+	unsigned int enable_shift;
+	unsigned int hold_shift;
+	unsigned int bypass_shift;
+};
+
+/*
+ * Main clock control parameters for clocks derived from the PLLs
+ */
+struct iproc_clk_ctrl {
+	unsigned int channel;
+	unsigned long flags;
+	struct iproc_clk_enable_ctrl enable;
+	struct iproc_clk_reg_op mdiv;
+};
+
+/*
+ * Divisor of the ASIU clocks
+ */
+struct iproc_asiu_div {
+	unsigned int offset;
+	unsigned int en_shift;
+	unsigned int high_shift;
+	unsigned int high_width;
+	unsigned int low_shift;
+	unsigned int low_width;
+};
+
+extern void __init iproc_armpll_setup(struct device_node *node);
+extern void __init iproc_pll_setup(struct device_node *node,
+		const struct iproc_pll_ctrl *ctrl,
+		const struct iproc_pll_vco_freq_param *vco_param,
+		unsigned int num_freqs);
+extern void __init iproc_clk_setup(struct device_node *node,
+		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks);
+extern void __init iproc_asiu_setup(struct device_node *node,
+		const struct iproc_asiu_div *div,
+		const struct iproc_asiu_gate *gate, unsigned int num_clks);
+
+#endif /* _CLK_IPROC_H */
-- 
1.7.9.5

[PATCH v4 3/5] clk: Change bcm clocks build dependency

[Ray Jui]

The clock code under drivers/clk/bcm now contains code for both the
Broadcom mobile SoCs and the iProc SoCs. Change the the makefile
dependency to be under config flag CONFIG_ARCH_BCM that's enabled for
both families of SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 drivers/clk/Makefile |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index d5fba5b..eff0213 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -41,7 +41,7 @@ obj-$(CONFIG_ARCH_VT8500)		+= clk-vt8500.o
 obj-$(CONFIG_COMMON_CLK_WM831X)		+= clk-wm831x.o
 obj-$(CONFIG_COMMON_CLK_XGENE)		+= clk-xgene.o
 obj-$(CONFIG_COMMON_CLK_AT91)		+= at91/
-obj-$(CONFIG_ARCH_BCM_MOBILE)		+= bcm/
+obj-$(CONFIG_ARCH_BCM)			+= bcm/
 obj-$(CONFIG_ARCH_BERLIN)		+= berlin/
 obj-$(CONFIG_ARCH_HI3xxx)		+= hisilicon/
 obj-$(CONFIG_ARCH_HIP04)		+= hisilicon/
-- 
1.7.9.5

[PATCH v4 3/5] clk: Change bcm clocks build dependency

[Ray Jui]

The clock code under drivers/clk/bcm now contains code for both the
Broadcom mobile SoCs and the iProc SoCs. Change the the makefile
dependency to be under config flag CONFIG_ARCH_BCM that's enabled for
both families of SoCs

Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
---
 drivers/clk/Makefile |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index d5fba5b..eff0213 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -41,7 +41,7 @@ obj-$(CONFIG_ARCH_VT8500)		+= clk-vt8500.o
 obj-$(CONFIG_COMMON_CLK_WM831X)		+= clk-wm831x.o
 obj-$(CONFIG_COMMON_CLK_XGENE)		+= clk-xgene.o
 obj-$(CONFIG_COMMON_CLK_AT91)		+= at91/
-obj-$(CONFIG_ARCH_BCM_MOBILE)		+= bcm/
+obj-$(CONFIG_ARCH_BCM)			+= bcm/
 obj-$(CONFIG_ARCH_BERLIN)		+= berlin/
 obj-$(CONFIG_ARCH_HI3xxx)		+= hisilicon/
 obj-$(CONFIG_ARCH_HIP04)		+= hisilicon/
-- 
1.7.9.5

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[PATCH v4 3/5] clk: Change bcm clocks build dependency

[Ray Jui]

The clock code under drivers/clk/bcm now contains code for both the
Broadcom mobile SoCs and the iProc SoCs. Change the the makefile
dependency to be under config flag CONFIG_ARCH_BCM that's enabled for
both families of SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 drivers/clk/Makefile |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index d5fba5b..eff0213 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -41,7 +41,7 @@ obj-$(CONFIG_ARCH_VT8500)		+= clk-vt8500.o
 obj-$(CONFIG_COMMON_CLK_WM831X)		+= clk-wm831x.o
 obj-$(CONFIG_COMMON_CLK_XGENE)		+= clk-xgene.o
 obj-$(CONFIG_COMMON_CLK_AT91)		+= at91/
-obj-$(CONFIG_ARCH_BCM_MOBILE)		+= bcm/
+obj-$(CONFIG_ARCH_BCM)			+= bcm/
 obj-$(CONFIG_ARCH_BERLIN)		+= berlin/
 obj-$(CONFIG_ARCH_HI3xxx)		+= hisilicon/
 obj-$(CONFIG_ARCH_HIP04)		+= hisilicon/
-- 
1.7.9.5

[PATCH v4 4/5] clk: cygnus: add clock support for Broadcom Cygnus

[Ray Jui]

The Broadcom Cygnus SoC is architected under the iProc architecture. It
has the following PLLs: ARMPLL, GENPLL, LCPLL0, MIPIPLL, all dervied
from an onboard crystal. Cygnus also has various ASIU clocks that are
derived directly from the onboard crystal.

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/clk/bcm/Makefile               |    1 +
 drivers/clk/bcm/clk-cygnus.c           |  277 ++++++++++++++++++++++++++++++++
 include/dt-bindings/clock/bcm-cygnus.h |   65 ++++++++
 3 files changed, 343 insertions(+)
 create mode 100644 drivers/clk/bcm/clk-cygnus.c
 create mode 100644 include/dt-bindings/clock/bcm-cygnus.h

diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
index 6926636..afcbe55 100644
--- a/drivers/clk/bcm/Makefile
+++ b/drivers/clk/bcm/Makefile
@@ -3,3 +3,4 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
 obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
+obj-$(CONFIG_ARCH_BCM_CYGNUS)	+= clk-cygnus.o
diff --git a/drivers/clk/bcm/clk-cygnus.c b/drivers/clk/bcm/clk-cygnus.c
new file mode 100644
index 0000000..f1dbfd7
--- /dev/null
+++ b/drivers/clk/bcm/clk-cygnus.c
@@ -0,0 +1,277 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include <dt-bindings/clock/bcm-cygnus.h>
+#include "clk-iproc.h"
+
+#define reg_val(o, s, w) { .offset = o, .shift = s, .width = w, }
+
+#define aon_val(o, pw, ps, is) { .offset = o, .pwr_width = pw, \
+	.pwr_shift = ps, .iso_shift = is }
+
+#define asiu_div_val(o, es, hs, hw, ls, lw) \
+		{ .offset = o, .en_shift = es, .high_shift = hs, \
+		.high_width = hw, .low_shift = ls, .low_width = lw }
+
+#define reset_val(o, rs, prs, kis, kiw, kps, kpw, kas, kaw) { .offset = o, \
+	.reset_shift = rs, .p_reset_shift = prs, .ki_shift = kis, \
+	.ki_width = kiw, .kp_shift = kps, .kp_width = kpw, .ka_shift = kas, \
+	.ka_width = kaw }
+
+#define vco_ctrl_val(uo, lo) { .u_offset = uo, .l_offset = lo }
+
+#define enable_val(o, es, hs, bs) { .offset = o, .enable_shift = es, \
+	.hold_shift = hs, .bypass_shift = bs }
+
+#define asiu_gate_val(o, es) { .offset = o, .en_shift = es }
+
+static void __init cygnus_armpll_init(struct device_node *node)
+{
+	iproc_armpll_setup(node);
+}
+CLK_OF_DECLARE(cygnus_armpll, "brcm,cygnus-armpll", cygnus_armpll_init);
+
+static const struct iproc_pll_ctrl genpll = {
+	.flags = IPROC_CLK_AON | IPROC_CLK_PLL_HAS_NDIV_FRAC,
+	.aon = aon_val(0x0, 2, 1, 0),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 3),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static void __init cygnus_genpll_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &genpll, NULL, 0);
+}
+CLK_OF_DECLARE(cygnus_genpll, "brcm,cygnus-genpll", cygnus_genpll_init);
+
+static const struct iproc_pll_ctrl lcpll0 = {
+	.flags = IPROC_CLK_AON,
+	.aon = aon_val(0x0, 2, 5, 4),
+	.reset = reset_val(0x0, 31, 30, 27, 3, 23, 4, 19, 4),
+	.ndiv_int = reg_val(0x4, 16, 10),
+	.pdiv = reg_val(0x4, 26, 4),
+	.vco_ctrl = vco_ctrl_val(0x10, 0x14),
+	.status = reg_val(0x18, 12, 1),
+};
+
+static void __init cygnus_lcpll0_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &lcpll0, NULL, 0);
+}
+CLK_OF_DECLARE(cygnus_lcpll0, "brcm,cygnus-lcpll0", cygnus_lcpll0_init);
+
+/*
+ * MIPI PLL VCO frequency parameter table
+ */
+static const struct iproc_pll_vco_freq_param mipipll_vco_params[] = {
+	/* rate (Hz) ndiv_int ndiv_frac pdiv */
+	{ 750000000UL,   30,     0,        1 },
+	{ 1000000000UL,  40,     0,        1 },
+	{ 1350000000ul,  54,     0,        1 },
+	{ 2000000000UL,  80,     0,        1 },
+	{ 2100000000UL,  84,     0,        1 },
+	{ 2250000000UL,  90,     0,        1 },
+	{ 2500000000UL,  100,    0,        1 },
+	{ 2700000000UL,  54,     0,        0 },
+	{ 2975000000UL,  119,    0,        1 },
+	{ 3100000000UL,  124,    0,        1 },
+	{ 3150000000UL,  126,    0,        1 },
+};
+
+static const struct iproc_pll_ctrl mipipll = {
+	.flags = IPROC_CLK_PLL_ASIU | IPROC_CLK_PLL_HAS_NDIV_FRAC,
+	.aon = aon_val(0x0, 4, 17, 16),
+	.asiu = asiu_gate_val(0x0, 3),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 4),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static void __init cygnus_mipipll_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &mipipll, mipipll_vco_params,
+			ARRAY_SIZE(mipipll_vco_params));
+}
+CLK_OF_DECLARE(cygnus_mipipll, "brcm,cygnus-mipipll", cygnus_mipipll_init);
+
+static const struct iproc_clk_ctrl genpll_clk[] = {
+	[BCM_CYGNUS_GENPLL_AXI21_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AXI21_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 6, 0, 12),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_250MHZ_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_250MHZ_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 7, 1, 13),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_IHOST_SYS_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_IHOST_SYS_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 8, 2, 14),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_GENPLL_ENET_SW_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_ENET_SW_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 9, 3, 15),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_AUDIO_125_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AUDIO_125_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 10, 4, 16),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_CAN_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_CAN_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 11, 5, 17),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static void __init cygnus_genpll_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, genpll_clk, ARRAY_SIZE(genpll_clk));
+}
+CLK_OF_DECLARE(cygnus_genpll_clk, "brcm,cygnus-genpll-clk",
+		cygnus_genpll_clk_init);
+
+static const struct iproc_clk_ctrl lcpll0_clk[] = {
+	[BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 7, 1, 13),
+		.mdiv = reg_val(0x8, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_DDR_PHY_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_DDR_PHY_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 8, 2, 14),
+		.mdiv = reg_val(0x8, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SDIO_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SDIO_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 9, 3, 15),
+		.mdiv = reg_val(0x8, 20, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 10, 4, 16),
+		.mdiv = reg_val(0xc, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SMART_CARD_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SMART_CARD_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 11, 5, 17),
+		.mdiv = reg_val(0xc, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_LCPLL0_CH5_UNUSED,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 12, 6, 18),
+		.mdiv = reg_val(0xc, 20, 8),
+	},
+};
+
+static void __init cygnus_lcpll0_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, lcpll0_clk, ARRAY_SIZE(lcpll0_clk));
+}
+CLK_OF_DECLARE(cygnus_lcpll0_clk, "brcm,cygnus-lcpll0-clk",
+		cygnus_lcpll0_clk_init);
+
+static const struct iproc_clk_ctrl mipipll_clk[] = {
+	[BCM_CYGNUS_MIPIPLL_CH0_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH0_UNUSED,
+		.enable = enable_val(0x4, 12, 6, 18),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH1_LCD] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH1_LCD,
+		.enable = enable_val(0x4, 13, 7, 19),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH2_V3D] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH2_V3D,
+		.enable = enable_val(0x4, 14, 8, 20),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH3_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH3_UNUSED,
+		.enable = enable_val(0x4, 15, 9, 21),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH4_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH4_UNUSED,
+		.enable = enable_val(0x4, 16, 10, 22),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH5_UNUSED,
+		.enable = enable_val(0x4, 17, 11, 23),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static void __init cygnus_mipipll_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, mipipll_clk, ARRAY_SIZE(mipipll_clk));
+}
+CLK_OF_DECLARE(cygnus_mipipll_clk, "brcm,cygnus-mipipll-clk",
+		cygnus_mipipll_clk_init);
+
+static const struct iproc_asiu_div asiu_div[] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
+		asiu_div_val(0x0, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_ADC_CLK] =
+		asiu_div_val(0x4, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_PWM_CLK] =
+		asiu_div_val(0x8, 31, 16, 10, 0, 10),
+};
+
+static const struct iproc_asiu_gate asiu_gate[] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
+		asiu_gate_val(0x0, 7),
+	[BCM_CYGNUS_ASIU_ADC_CLK] =
+		asiu_gate_val(0x0, 9),
+	[BCM_CYGNUS_ASIU_PWM_CLK] =
+		asiu_gate_val(IPROC_CLK_INVALID_OFFSET, 0),
+};
+
+static void __init cygnus_asiu_init(struct device_node *node)
+{
+	iproc_asiu_setup(node, asiu_div, asiu_gate, ARRAY_SIZE(asiu_div));
+}
+CLK_OF_DECLARE(cygnus_asiu_clk, "brcm,cygnus-asiu-clk", cygnus_asiu_init);
diff --git a/include/dt-bindings/clock/bcm-cygnus.h b/include/dt-bindings/clock/bcm-cygnus.h
new file mode 100644
index 0000000..9d30582
--- /dev/null
+++ b/include/dt-bindings/clock/bcm-cygnus.h
@@ -0,0 +1,65 @@
+/*
+ *  BSD LICENSE
+ *
+ *  Copyright(c) 2014 Broadcom Corporation.  All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in
+ *      the documentation and/or other materials provided with the
+ *      distribution.
+ *    * Neither the name of Broadcom Corporation nor the names of its
+ *      contributors may be used to endorse or promote products derived
+ *      from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _CLOCK_BCM_CYGNUS_H
+#define _CLOCK_BCM_CYGNUS_H
+
+/* GENPLL clock channel ID */
+#define BCM_CYGNUS_GENPLL_AXI21_CLK          0
+#define BCM_CYGNUS_GENPLL_250MHZ_CLK         1
+#define BCM_CYGNUS_GENPLL_IHOST_SYS_CLK      2
+#define BCM_CYGNUS_GENPLL_ENET_SW_CLK        3
+#define BCM_CYGNUS_GENPLL_AUDIO_125_CLK      4
+#define BCM_CYGNUS_GENPLL_CAN_CLK            5
+
+/* LCPLL0 clock channel ID */
+#define BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK    0
+#define BCM_CYGNUS_LCPLL0_DDR_PHY_CLK         1
+#define BCM_CYGNUS_LCPLL0_SDIO_CLK            2
+#define BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK     3
+#define BCM_CYGNUS_LCPLL0_SMART_CARD_CLK      4
+#define BCM_CYGNUS_LCPLL0_CH5_UNUSED          5
+
+/* MIPI PLL clock channel ID */
+#define BCM_CYGNUS_MIPIPLL_CH0_UNUSED         0
+#define BCM_CYGNUS_MIPIPLL_CH1_LCD            1
+#define BCM_CYGNUS_MIPIPLL_CH2_V3D            2
+#define BCM_CYGNUS_MIPIPLL_CH3_UNUSED         3
+#define BCM_CYGNUS_MIPIPLL_CH4_UNUSED         4
+#define BCM_CYGNUS_MIPIPLL_CH5_UNUSED         5
+
+/* ASIU clock IDs */
+#define BCM_CYGNUS_ASIU_KEYPAD_CLK    0
+#define BCM_CYGNUS_ASIU_ADC_CLK       1
+#define BCM_CYGNUS_ASIU_PWM_CLK       2
+
+#endif /* _CLOCK_BCM_CYGNUS_H */
-- 
1.7.9.5

[PATCH v4 4/5] clk: cygnus: add clock support for Broadcom Cygnus

[Ray Jui]

The Broadcom Cygnus SoC is architected under the iProc architecture. It
has the following PLLs: ARMPLL, GENPLL, LCPLL0, MIPIPLL, all dervied
from an onboard crystal. Cygnus also has various ASIU clocks that are
derived directly from the onboard crystal.

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/clk/bcm/Makefile               |    1 +
 drivers/clk/bcm/clk-cygnus.c           |  277 ++++++++++++++++++++++++++++++++
 include/dt-bindings/clock/bcm-cygnus.h |   65 ++++++++
 3 files changed, 343 insertions(+)
 create mode 100644 drivers/clk/bcm/clk-cygnus.c
 create mode 100644 include/dt-bindings/clock/bcm-cygnus.h

diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
index 6926636..afcbe55 100644
--- a/drivers/clk/bcm/Makefile
+++ b/drivers/clk/bcm/Makefile
@@ -3,3 +3,4 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
 obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
+obj-$(CONFIG_ARCH_BCM_CYGNUS)	+= clk-cygnus.o
diff --git a/drivers/clk/bcm/clk-cygnus.c b/drivers/clk/bcm/clk-cygnus.c
new file mode 100644
index 0000000..f1dbfd7
--- /dev/null
+++ b/drivers/clk/bcm/clk-cygnus.c
@@ -0,0 +1,277 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include <dt-bindings/clock/bcm-cygnus.h>
+#include "clk-iproc.h"
+
+#define reg_val(o, s, w) { .offset = o, .shift = s, .width = w, }
+
+#define aon_val(o, pw, ps, is) { .offset = o, .pwr_width = pw, \
+	.pwr_shift = ps, .iso_shift = is }
+
+#define asiu_div_val(o, es, hs, hw, ls, lw) \
+		{ .offset = o, .en_shift = es, .high_shift = hs, \
+		.high_width = hw, .low_shift = ls, .low_width = lw }
+
+#define reset_val(o, rs, prs, kis, kiw, kps, kpw, kas, kaw) { .offset = o, \
+	.reset_shift = rs, .p_reset_shift = prs, .ki_shift = kis, \
+	.ki_width = kiw, .kp_shift = kps, .kp_width = kpw, .ka_shift = kas, \
+	.ka_width = kaw }
+
+#define vco_ctrl_val(uo, lo) { .u_offset = uo, .l_offset = lo }
+
+#define enable_val(o, es, hs, bs) { .offset = o, .enable_shift = es, \
+	.hold_shift = hs, .bypass_shift = bs }
+
+#define asiu_gate_val(o, es) { .offset = o, .en_shift = es }
+
+static void __init cygnus_armpll_init(struct device_node *node)
+{
+	iproc_armpll_setup(node);
+}
+CLK_OF_DECLARE(cygnus_armpll, "brcm,cygnus-armpll", cygnus_armpll_init);
+
+static const struct iproc_pll_ctrl genpll = {
+	.flags = IPROC_CLK_AON | IPROC_CLK_PLL_HAS_NDIV_FRAC,
+	.aon = aon_val(0x0, 2, 1, 0),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 3),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static void __init cygnus_genpll_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &genpll, NULL, 0);
+}
+CLK_OF_DECLARE(cygnus_genpll, "brcm,cygnus-genpll", cygnus_genpll_init);
+
+static const struct iproc_pll_ctrl lcpll0 = {
+	.flags = IPROC_CLK_AON,
+	.aon = aon_val(0x0, 2, 5, 4),
+	.reset = reset_val(0x0, 31, 30, 27, 3, 23, 4, 19, 4),
+	.ndiv_int = reg_val(0x4, 16, 10),
+	.pdiv = reg_val(0x4, 26, 4),
+	.vco_ctrl = vco_ctrl_val(0x10, 0x14),
+	.status = reg_val(0x18, 12, 1),
+};
+
+static void __init cygnus_lcpll0_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &lcpll0, NULL, 0);
+}
+CLK_OF_DECLARE(cygnus_lcpll0, "brcm,cygnus-lcpll0", cygnus_lcpll0_init);
+
+/*
+ * MIPI PLL VCO frequency parameter table
+ */
+static const struct iproc_pll_vco_freq_param mipipll_vco_params[] = {
+	/* rate (Hz) ndiv_int ndiv_frac pdiv */
+	{ 750000000UL,   30,     0,        1 },
+	{ 1000000000UL,  40,     0,        1 },
+	{ 1350000000ul,  54,     0,        1 },
+	{ 2000000000UL,  80,     0,        1 },
+	{ 2100000000UL,  84,     0,        1 },
+	{ 2250000000UL,  90,     0,        1 },
+	{ 2500000000UL,  100,    0,        1 },
+	{ 2700000000UL,  54,     0,        0 },
+	{ 2975000000UL,  119,    0,        1 },
+	{ 3100000000UL,  124,    0,        1 },
+	{ 3150000000UL,  126,    0,        1 },
+};
+
+static const struct iproc_pll_ctrl mipipll = {
+	.flags = IPROC_CLK_PLL_ASIU | IPROC_CLK_PLL_HAS_NDIV_FRAC,
+	.aon = aon_val(0x0, 4, 17, 16),
+	.asiu = asiu_gate_val(0x0, 3),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 4),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static void __init cygnus_mipipll_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &mipipll, mipipll_vco_params,
+			ARRAY_SIZE(mipipll_vco_params));
+}
+CLK_OF_DECLARE(cygnus_mipipll, "brcm,cygnus-mipipll", cygnus_mipipll_init);
+
+static const struct iproc_clk_ctrl genpll_clk[] = {
+	[BCM_CYGNUS_GENPLL_AXI21_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AXI21_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 6, 0, 12),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_250MHZ_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_250MHZ_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 7, 1, 13),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_IHOST_SYS_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_IHOST_SYS_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 8, 2, 14),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_GENPLL_ENET_SW_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_ENET_SW_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 9, 3, 15),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_AUDIO_125_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AUDIO_125_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 10, 4, 16),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_CAN_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_CAN_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 11, 5, 17),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static void __init cygnus_genpll_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, genpll_clk, ARRAY_SIZE(genpll_clk));
+}
+CLK_OF_DECLARE(cygnus_genpll_clk, "brcm,cygnus-genpll-clk",
+		cygnus_genpll_clk_init);
+
+static const struct iproc_clk_ctrl lcpll0_clk[] = {
+	[BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 7, 1, 13),
+		.mdiv = reg_val(0x8, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_DDR_PHY_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_DDR_PHY_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 8, 2, 14),
+		.mdiv = reg_val(0x8, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SDIO_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SDIO_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 9, 3, 15),
+		.mdiv = reg_val(0x8, 20, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 10, 4, 16),
+		.mdiv = reg_val(0xc, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SMART_CARD_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SMART_CARD_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 11, 5, 17),
+		.mdiv = reg_val(0xc, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_LCPLL0_CH5_UNUSED,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 12, 6, 18),
+		.mdiv = reg_val(0xc, 20, 8),
+	},
+};
+
+static void __init cygnus_lcpll0_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, lcpll0_clk, ARRAY_SIZE(lcpll0_clk));
+}
+CLK_OF_DECLARE(cygnus_lcpll0_clk, "brcm,cygnus-lcpll0-clk",
+		cygnus_lcpll0_clk_init);
+
+static const struct iproc_clk_ctrl mipipll_clk[] = {
+	[BCM_CYGNUS_MIPIPLL_CH0_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH0_UNUSED,
+		.enable = enable_val(0x4, 12, 6, 18),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH1_LCD] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH1_LCD,
+		.enable = enable_val(0x4, 13, 7, 19),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH2_V3D] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH2_V3D,
+		.enable = enable_val(0x4, 14, 8, 20),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH3_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH3_UNUSED,
+		.enable = enable_val(0x4, 15, 9, 21),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH4_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH4_UNUSED,
+		.enable = enable_val(0x4, 16, 10, 22),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH5_UNUSED,
+		.enable = enable_val(0x4, 17, 11, 23),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static void __init cygnus_mipipll_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, mipipll_clk, ARRAY_SIZE(mipipll_clk));
+}
+CLK_OF_DECLARE(cygnus_mipipll_clk, "brcm,cygnus-mipipll-clk",
+		cygnus_mipipll_clk_init);
+
+static const struct iproc_asiu_div asiu_div[] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
+		asiu_div_val(0x0, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_ADC_CLK] =
+		asiu_div_val(0x4, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_PWM_CLK] =
+		asiu_div_val(0x8, 31, 16, 10, 0, 10),
+};
+
+static const struct iproc_asiu_gate asiu_gate[] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
+		asiu_gate_val(0x0, 7),
+	[BCM_CYGNUS_ASIU_ADC_CLK] =
+		asiu_gate_val(0x0, 9),
+	[BCM_CYGNUS_ASIU_PWM_CLK] =
+		asiu_gate_val(IPROC_CLK_INVALID_OFFSET, 0),
+};
+
+static void __init cygnus_asiu_init(struct device_node *node)
+{
+	iproc_asiu_setup(node, asiu_div, asiu_gate, ARRAY_SIZE(asiu_div));
+}
+CLK_OF_DECLARE(cygnus_asiu_clk, "brcm,cygnus-asiu-clk", cygnus_asiu_init);
diff --git a/include/dt-bindings/clock/bcm-cygnus.h b/include/dt-bindings/clock/bcm-cygnus.h
new file mode 100644
index 0000000..9d30582
--- /dev/null
+++ b/include/dt-bindings/clock/bcm-cygnus.h
@@ -0,0 +1,65 @@
+/*
+ *  BSD LICENSE
+ *
+ *  Copyright(c) 2014 Broadcom Corporation.  All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in
+ *      the documentation and/or other materials provided with the
+ *      distribution.
+ *    * Neither the name of Broadcom Corporation nor the names of its
+ *      contributors may be used to endorse or promote products derived
+ *      from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _CLOCK_BCM_CYGNUS_H
+#define _CLOCK_BCM_CYGNUS_H
+
+/* GENPLL clock channel ID */
+#define BCM_CYGNUS_GENPLL_AXI21_CLK          0
+#define BCM_CYGNUS_GENPLL_250MHZ_CLK         1
+#define BCM_CYGNUS_GENPLL_IHOST_SYS_CLK      2
+#define BCM_CYGNUS_GENPLL_ENET_SW_CLK        3
+#define BCM_CYGNUS_GENPLL_AUDIO_125_CLK      4
+#define BCM_CYGNUS_GENPLL_CAN_CLK            5
+
+/* LCPLL0 clock channel ID */
+#define BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK    0
+#define BCM_CYGNUS_LCPLL0_DDR_PHY_CLK         1
+#define BCM_CYGNUS_LCPLL0_SDIO_CLK            2
+#define BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK     3
+#define BCM_CYGNUS_LCPLL0_SMART_CARD_CLK      4
+#define BCM_CYGNUS_LCPLL0_CH5_UNUSED          5
+
+/* MIPI PLL clock channel ID */
+#define BCM_CYGNUS_MIPIPLL_CH0_UNUSED         0
+#define BCM_CYGNUS_MIPIPLL_CH1_LCD            1
+#define BCM_CYGNUS_MIPIPLL_CH2_V3D            2
+#define BCM_CYGNUS_MIPIPLL_CH3_UNUSED         3
+#define BCM_CYGNUS_MIPIPLL_CH4_UNUSED         4
+#define BCM_CYGNUS_MIPIPLL_CH5_UNUSED         5
+
+/* ASIU clock IDs */
+#define BCM_CYGNUS_ASIU_KEYPAD_CLK    0
+#define BCM_CYGNUS_ASIU_ADC_CLK       1
+#define BCM_CYGNUS_ASIU_PWM_CLK       2
+
+#endif /* _CLOCK_BCM_CYGNUS_H */
-- 
1.7.9.5

[PATCH v4 4/5] clk: cygnus: add clock support for Broadcom Cygnus

[Ray Jui]

The Broadcom Cygnus SoC is architected under the iProc architecture. It
has the following PLLs: ARMPLL, GENPLL, LCPLL0, MIPIPLL, all dervied
from an onboard crystal. Cygnus also has various ASIU clocks that are
derived directly from the onboard crystal.

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/clk/bcm/Makefile               |    1 +
 drivers/clk/bcm/clk-cygnus.c           |  277 ++++++++++++++++++++++++++++++++
 include/dt-bindings/clock/bcm-cygnus.h |   65 ++++++++
 3 files changed, 343 insertions(+)
 create mode 100644 drivers/clk/bcm/clk-cygnus.c
 create mode 100644 include/dt-bindings/clock/bcm-cygnus.h

diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
index 6926636..afcbe55 100644
--- a/drivers/clk/bcm/Makefile
+++ b/drivers/clk/bcm/Makefile
@@ -3,3 +3,4 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
 obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
+obj-$(CONFIG_ARCH_BCM_CYGNUS)	+= clk-cygnus.o
diff --git a/drivers/clk/bcm/clk-cygnus.c b/drivers/clk/bcm/clk-cygnus.c
new file mode 100644
index 0000000..f1dbfd7
--- /dev/null
+++ b/drivers/clk/bcm/clk-cygnus.c
@@ -0,0 +1,277 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include <dt-bindings/clock/bcm-cygnus.h>
+#include "clk-iproc.h"
+
+#define reg_val(o, s, w) { .offset = o, .shift = s, .width = w, }
+
+#define aon_val(o, pw, ps, is) { .offset = o, .pwr_width = pw, \
+	.pwr_shift = ps, .iso_shift = is }
+
+#define asiu_div_val(o, es, hs, hw, ls, lw) \
+		{ .offset = o, .en_shift = es, .high_shift = hs, \
+		.high_width = hw, .low_shift = ls, .low_width = lw }
+
+#define reset_val(o, rs, prs, kis, kiw, kps, kpw, kas, kaw) { .offset = o, \
+	.reset_shift = rs, .p_reset_shift = prs, .ki_shift = kis, \
+	.ki_width = kiw, .kp_shift = kps, .kp_width = kpw, .ka_shift = kas, \
+	.ka_width = kaw }
+
+#define vco_ctrl_val(uo, lo) { .u_offset = uo, .l_offset = lo }
+
+#define enable_val(o, es, hs, bs) { .offset = o, .enable_shift = es, \
+	.hold_shift = hs, .bypass_shift = bs }
+
+#define asiu_gate_val(o, es) { .offset = o, .en_shift = es }
+
+static void __init cygnus_armpll_init(struct device_node *node)
+{
+	iproc_armpll_setup(node);
+}
+CLK_OF_DECLARE(cygnus_armpll, "brcm,cygnus-armpll", cygnus_armpll_init);
+
+static const struct iproc_pll_ctrl genpll = {
+	.flags = IPROC_CLK_AON | IPROC_CLK_PLL_HAS_NDIV_FRAC,
+	.aon = aon_val(0x0, 2, 1, 0),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 3),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static void __init cygnus_genpll_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &genpll, NULL, 0);
+}
+CLK_OF_DECLARE(cygnus_genpll, "brcm,cygnus-genpll", cygnus_genpll_init);
+
+static const struct iproc_pll_ctrl lcpll0 = {
+	.flags = IPROC_CLK_AON,
+	.aon = aon_val(0x0, 2, 5, 4),
+	.reset = reset_val(0x0, 31, 30, 27, 3, 23, 4, 19, 4),
+	.ndiv_int = reg_val(0x4, 16, 10),
+	.pdiv = reg_val(0x4, 26, 4),
+	.vco_ctrl = vco_ctrl_val(0x10, 0x14),
+	.status = reg_val(0x18, 12, 1),
+};
+
+static void __init cygnus_lcpll0_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &lcpll0, NULL, 0);
+}
+CLK_OF_DECLARE(cygnus_lcpll0, "brcm,cygnus-lcpll0", cygnus_lcpll0_init);
+
+/*
+ * MIPI PLL VCO frequency parameter table
+ */
+static const struct iproc_pll_vco_freq_param mipipll_vco_params[] = {
+	/* rate (Hz) ndiv_int ndiv_frac pdiv */
+	{ 750000000UL,   30,     0,        1 },
+	{ 1000000000UL,  40,     0,        1 },
+	{ 1350000000ul,  54,     0,        1 },
+	{ 2000000000UL,  80,     0,        1 },
+	{ 2100000000UL,  84,     0,        1 },
+	{ 2250000000UL,  90,     0,        1 },
+	{ 2500000000UL,  100,    0,        1 },
+	{ 2700000000UL,  54,     0,        0 },
+	{ 2975000000UL,  119,    0,        1 },
+	{ 3100000000UL,  124,    0,        1 },
+	{ 3150000000UL,  126,    0,        1 },
+};
+
+static const struct iproc_pll_ctrl mipipll = {
+	.flags = IPROC_CLK_PLL_ASIU | IPROC_CLK_PLL_HAS_NDIV_FRAC,
+	.aon = aon_val(0x0, 4, 17, 16),
+	.asiu = asiu_gate_val(0x0, 3),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 4),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static void __init cygnus_mipipll_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &mipipll, mipipll_vco_params,
+			ARRAY_SIZE(mipipll_vco_params));
+}
+CLK_OF_DECLARE(cygnus_mipipll, "brcm,cygnus-mipipll", cygnus_mipipll_init);
+
+static const struct iproc_clk_ctrl genpll_clk[] = {
+	[BCM_CYGNUS_GENPLL_AXI21_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AXI21_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 6, 0, 12),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_250MHZ_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_250MHZ_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 7, 1, 13),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_IHOST_SYS_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_IHOST_SYS_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 8, 2, 14),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_GENPLL_ENET_SW_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_ENET_SW_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 9, 3, 15),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_AUDIO_125_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AUDIO_125_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 10, 4, 16),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_CAN_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_CAN_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 11, 5, 17),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static void __init cygnus_genpll_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, genpll_clk, ARRAY_SIZE(genpll_clk));
+}
+CLK_OF_DECLARE(cygnus_genpll_clk, "brcm,cygnus-genpll-clk",
+		cygnus_genpll_clk_init);
+
+static const struct iproc_clk_ctrl lcpll0_clk[] = {
+	[BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 7, 1, 13),
+		.mdiv = reg_val(0x8, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_DDR_PHY_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_DDR_PHY_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 8, 2, 14),
+		.mdiv = reg_val(0x8, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SDIO_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SDIO_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 9, 3, 15),
+		.mdiv = reg_val(0x8, 20, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 10, 4, 16),
+		.mdiv = reg_val(0xc, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SMART_CARD_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SMART_CARD_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 11, 5, 17),
+		.mdiv = reg_val(0xc, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_LCPLL0_CH5_UNUSED,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 12, 6, 18),
+		.mdiv = reg_val(0xc, 20, 8),
+	},
+};
+
+static void __init cygnus_lcpll0_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, lcpll0_clk, ARRAY_SIZE(lcpll0_clk));
+}
+CLK_OF_DECLARE(cygnus_lcpll0_clk, "brcm,cygnus-lcpll0-clk",
+		cygnus_lcpll0_clk_init);
+
+static const struct iproc_clk_ctrl mipipll_clk[] = {
+	[BCM_CYGNUS_MIPIPLL_CH0_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH0_UNUSED,
+		.enable = enable_val(0x4, 12, 6, 18),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH1_LCD] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH1_LCD,
+		.enable = enable_val(0x4, 13, 7, 19),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH2_V3D] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH2_V3D,
+		.enable = enable_val(0x4, 14, 8, 20),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH3_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH3_UNUSED,
+		.enable = enable_val(0x4, 15, 9, 21),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH4_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH4_UNUSED,
+		.enable = enable_val(0x4, 16, 10, 22),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH5_UNUSED,
+		.enable = enable_val(0x4, 17, 11, 23),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static void __init cygnus_mipipll_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, mipipll_clk, ARRAY_SIZE(mipipll_clk));
+}
+CLK_OF_DECLARE(cygnus_mipipll_clk, "brcm,cygnus-mipipll-clk",
+		cygnus_mipipll_clk_init);
+
+static const struct iproc_asiu_div asiu_div[] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
+		asiu_div_val(0x0, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_ADC_CLK] =
+		asiu_div_val(0x4, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_PWM_CLK] =
+		asiu_div_val(0x8, 31, 16, 10, 0, 10),
+};
+
+static const struct iproc_asiu_gate asiu_gate[] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
+		asiu_gate_val(0x0, 7),
+	[BCM_CYGNUS_ASIU_ADC_CLK] =
+		asiu_gate_val(0x0, 9),
+	[BCM_CYGNUS_ASIU_PWM_CLK] =
+		asiu_gate_val(IPROC_CLK_INVALID_OFFSET, 0),
+};
+
+static void __init cygnus_asiu_init(struct device_node *node)
+{
+	iproc_asiu_setup(node, asiu_div, asiu_gate, ARRAY_SIZE(asiu_div));
+}
+CLK_OF_DECLARE(cygnus_asiu_clk, "brcm,cygnus-asiu-clk", cygnus_asiu_init);
diff --git a/include/dt-bindings/clock/bcm-cygnus.h b/include/dt-bindings/clock/bcm-cygnus.h
new file mode 100644
index 0000000..9d30582
--- /dev/null
+++ b/include/dt-bindings/clock/bcm-cygnus.h
@@ -0,0 +1,65 @@
+/*
+ *  BSD LICENSE
+ *
+ *  Copyright(c) 2014 Broadcom Corporation.  All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in
+ *      the documentation and/or other materials provided with the
+ *      distribution.
+ *    * Neither the name of Broadcom Corporation nor the names of its
+ *      contributors may be used to endorse or promote products derived
+ *      from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _CLOCK_BCM_CYGNUS_H
+#define _CLOCK_BCM_CYGNUS_H
+
+/* GENPLL clock channel ID */
+#define BCM_CYGNUS_GENPLL_AXI21_CLK          0
+#define BCM_CYGNUS_GENPLL_250MHZ_CLK         1
+#define BCM_CYGNUS_GENPLL_IHOST_SYS_CLK      2
+#define BCM_CYGNUS_GENPLL_ENET_SW_CLK        3
+#define BCM_CYGNUS_GENPLL_AUDIO_125_CLK      4
+#define BCM_CYGNUS_GENPLL_CAN_CLK            5
+
+/* LCPLL0 clock channel ID */
+#define BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK    0
+#define BCM_CYGNUS_LCPLL0_DDR_PHY_CLK         1
+#define BCM_CYGNUS_LCPLL0_SDIO_CLK            2
+#define BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK     3
+#define BCM_CYGNUS_LCPLL0_SMART_CARD_CLK      4
+#define BCM_CYGNUS_LCPLL0_CH5_UNUSED          5
+
+/* MIPI PLL clock channel ID */
+#define BCM_CYGNUS_MIPIPLL_CH0_UNUSED         0
+#define BCM_CYGNUS_MIPIPLL_CH1_LCD            1
+#define BCM_CYGNUS_MIPIPLL_CH2_V3D            2
+#define BCM_CYGNUS_MIPIPLL_CH3_UNUSED         3
+#define BCM_CYGNUS_MIPIPLL_CH4_UNUSED         4
+#define BCM_CYGNUS_MIPIPLL_CH5_UNUSED         5
+
+/* ASIU clock IDs */
+#define BCM_CYGNUS_ASIU_KEYPAD_CLK    0
+#define BCM_CYGNUS_ASIU_ADC_CLK       1
+#define BCM_CYGNUS_ASIU_PWM_CLK       2
+
+#endif /* _CLOCK_BCM_CYGNUS_H */
-- 
1.7.9.5

[PATCH v4 5/5] ARM: dts: enable clock support for Broadcom Cygnus

[Ray Jui]

Replace current device tree dummy clocks with real clock support for
Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbraden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus-clock.dtsi |  110 ++++++++++++++++++++++++-------
 arch/arm/boot/dts/bcm-cygnus.dtsi       |    2 +-
 2 files changed, 86 insertions(+), 26 deletions(-)

diff --git a/arch/arm/boot/dts/bcm-cygnus-clock.dtsi b/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
index 60d8389..abb8a3f 100644
--- a/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
@@ -36,56 +36,116 @@ clocks {
 	ranges;
 
 	osc: oscillator {
+		#clock-cells = <0>;
 		compatible = "fixed-clock";
-		#clock-cells = <1>;
 		clock-frequency = <25000000>;
 	};
 
-	apb_clk: apb_clk {
-		compatible = "fixed-clock";
+	/* Cygnus ARM PLL */
+	armpll: armpll {
 		#clock-cells = <0>;
-		clock-frequency = <1000000000>;
+		compatible = "brcm,cygnus-armpll";
+		clocks = <&osc>;
+		reg = <0x19000000 0x1000>;
 	};
 
-	periph_clk: periph_clk {
-		compatible = "fixed-clock";
+	/* peripheral clock for system timer */
+	arm_periph_clk: arm_periph_clk {
 		#clock-cells = <0>;
-		clock-frequency = <500000000>;
+		compatible = "fixed-factor-clock";
+		clocks = <&armpll>;
+		clock-div = <2>;
+		clock-mult = <1>;
 	};
 
-	sdio_clk: lcpll_ch2 {
-		compatible = "fixed-clock";
+	/* APB bus clock */
+	apb_clk: apb_clk {
 		#clock-cells = <0>;
-		clock-frequency = <200000000>;
+		compatible = "fixed-factor-clock";
+		clocks = <&armpll>;
+		clock-div = <4>;
+		clock-mult = <1>;
 	};
 
-	axi81_clk: axi81_clk {
-		compatible = "fixed-clock";
+	genpll: genpll {
 		#clock-cells = <0>;
-		clock-frequency = <100000000>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
 	};
 
-	keypad_clk: keypad_clk {
-		compatible = "fixed-clock";
+	/* various clocks running off the GENPLL */
+	genpll_clks: genpll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-genpll-clk";
+		reg = <0x0301d000 0x2c>;
+		clocks = <&genpll>;
+		clock-output-names = "axi21", "250mhz", "ihost_sys",
+			"enet_sw", "audio_125", "can";
+	};
+
+	/* always 1/2 of the axi21 clock */
+	axi41_clk: axi41_clk {
 		#clock-cells = <0>;
-		clock-frequency = <31806>;
+		compatible = "fixed-factor-clock";
+		clocks = <&genpll_clks 0>;
+		clock-div = <2>;
+		clock-mult = <1>;
 	};
 
-	adc_clk: adc_clk {
-		compatible = "fixed-clock";
+	/* always 1/4 of the axi21 clock */
+	axi81_clk: axi81_clk {
 		#clock-cells = <0>;
-		clock-frequency = <1562500>;
+		compatible = "fixed-factor-clock";
+		clocks = <&genpll_clks 0>;
+		clock-div = <4>;
+		clock-mult = <1>;
 	};
 
-	pwm_clk: pwm_clk {
-		compatible = "fixed-clock";
+	lcpll0: lcpll0 {
 		#clock-cells = <0>;
-		clock-frequency = <1000000>;
+		compatible = "brcm,cygnus-lcpll0";
+		reg = <0x0301d02c 0x1c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
 	};
 
-	lcd_clk: mipipll_ch1 {
-		compatible = "fixed-clock";
+	/* various clocks running off the LCPLL0 */
+	lcpll0_clks: lcpll0_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-lcpll0-clk";
+		reg = <0x0301d02c 0x1c>;
+		clocks = <&lcpll0>;
+		clock-output-names = "pcie_phy", "ddr_phy", "sdio",
+			"usb_phy", "smart_card", "ch5";
+	};
+
+	mipipll: mipipll {
 		#clock-cells = <0>;
-		clock-frequency = <100000000>;
+		compatible = "brcm,cygnus-mipipll";
+		reg = <0x180a9800 0x2c>,
+			<0x0301c020 0x4>,
+			<0x180aa024 0x4>;
+		clock-frequency = <2100000000>;
+		clocks = <&osc>;
+	};
+
+	mipipll_clks: mipipll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-mipipll-clk";
+		reg = <0x180a9800 0x2c>;
+		clocks = <&mipipll>;
+		clock-output-names = "ch0_unused", "ch1_lcd", "ch2_unused",
+			"ch3_unused", "ch4_unused", "ch5_unused";
+	};
+
+	asiu_clks: asiu_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-asiu-clk";
+		reg = <0x0301d048 0xc>,
+			<0x180aa024 0x4>;
+		clocks = <&osc>;
+		clock-output-names = "keypad", "adc/touch", "pwm";
 	};
 };
diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..2b99e9c 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -134,7 +134,7 @@
 		compatible = "arm,cortex-a9-global-timer";
 		reg = <0x19020200 0x100>;
 		interrupts = <GIC_PPI 11 IRQ_TYPE_LEVEL_HIGH>;
-		clocks = <&periph_clk>;
+		clocks = <&arm_periph_clk>;
 	};
 
 };
-- 
1.7.9.5

[PATCH v4 5/5] ARM: dts: enable clock support for Broadcom Cygnus

[Ray Jui]

Replace current device tree dummy clocks with real clock support for
Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbraden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus-clock.dtsi |  110 ++++++++++++++++++++++++-------
 arch/arm/boot/dts/bcm-cygnus.dtsi       |    2 +-
 2 files changed, 86 insertions(+), 26 deletions(-)

diff --git a/arch/arm/boot/dts/bcm-cygnus-clock.dtsi b/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
index 60d8389..abb8a3f 100644
--- a/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
@@ -36,56 +36,116 @@ clocks {
 	ranges;
 
 	osc: oscillator {
+		#clock-cells = <0>;
 		compatible = "fixed-clock";
-		#clock-cells = <1>;
 		clock-frequency = <25000000>;
 	};
 
-	apb_clk: apb_clk {
-		compatible = "fixed-clock";
+	/* Cygnus ARM PLL */
+	armpll: armpll {
 		#clock-cells = <0>;
-		clock-frequency = <1000000000>;
+		compatible = "brcm,cygnus-armpll";
+		clocks = <&osc>;
+		reg = <0x19000000 0x1000>;
 	};
 
-	periph_clk: periph_clk {
-		compatible = "fixed-clock";
+	/* peripheral clock for system timer */
+	arm_periph_clk: arm_periph_clk {
 		#clock-cells = <0>;
-		clock-frequency = <500000000>;
+		compatible = "fixed-factor-clock";
+		clocks = <&armpll>;
+		clock-div = <2>;
+		clock-mult = <1>;
 	};
 
-	sdio_clk: lcpll_ch2 {
-		compatible = "fixed-clock";
+	/* APB bus clock */
+	apb_clk: apb_clk {
 		#clock-cells = <0>;
-		clock-frequency = <200000000>;
+		compatible = "fixed-factor-clock";
+		clocks = <&armpll>;
+		clock-div = <4>;
+		clock-mult = <1>;
 	};
 
-	axi81_clk: axi81_clk {
-		compatible = "fixed-clock";
+	genpll: genpll {
 		#clock-cells = <0>;
-		clock-frequency = <100000000>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
 	};
 
-	keypad_clk: keypad_clk {
-		compatible = "fixed-clock";
+	/* various clocks running off the GENPLL */
+	genpll_clks: genpll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-genpll-clk";
+		reg = <0x0301d000 0x2c>;
+		clocks = <&genpll>;
+		clock-output-names = "axi21", "250mhz", "ihost_sys",
+			"enet_sw", "audio_125", "can";
+	};
+
+	/* always 1/2 of the axi21 clock */
+	axi41_clk: axi41_clk {
 		#clock-cells = <0>;
-		clock-frequency = <31806>;
+		compatible = "fixed-factor-clock";
+		clocks = <&genpll_clks 0>;
+		clock-div = <2>;
+		clock-mult = <1>;
 	};
 
-	adc_clk: adc_clk {
-		compatible = "fixed-clock";
+	/* always 1/4 of the axi21 clock */
+	axi81_clk: axi81_clk {
 		#clock-cells = <0>;
-		clock-frequency = <1562500>;
+		compatible = "fixed-factor-clock";
+		clocks = <&genpll_clks 0>;
+		clock-div = <4>;
+		clock-mult = <1>;
 	};
 
-	pwm_clk: pwm_clk {
-		compatible = "fixed-clock";
+	lcpll0: lcpll0 {
 		#clock-cells = <0>;
-		clock-frequency = <1000000>;
+		compatible = "brcm,cygnus-lcpll0";
+		reg = <0x0301d02c 0x1c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
 	};
 
-	lcd_clk: mipipll_ch1 {
-		compatible = "fixed-clock";
+	/* various clocks running off the LCPLL0 */
+	lcpll0_clks: lcpll0_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-lcpll0-clk";
+		reg = <0x0301d02c 0x1c>;
+		clocks = <&lcpll0>;
+		clock-output-names = "pcie_phy", "ddr_phy", "sdio",
+			"usb_phy", "smart_card", "ch5";
+	};
+
+	mipipll: mipipll {
 		#clock-cells = <0>;
-		clock-frequency = <100000000>;
+		compatible = "brcm,cygnus-mipipll";
+		reg = <0x180a9800 0x2c>,
+			<0x0301c020 0x4>,
+			<0x180aa024 0x4>;
+		clock-frequency = <2100000000>;
+		clocks = <&osc>;
+	};
+
+	mipipll_clks: mipipll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-mipipll-clk";
+		reg = <0x180a9800 0x2c>;
+		clocks = <&mipipll>;
+		clock-output-names = "ch0_unused", "ch1_lcd", "ch2_unused",
+			"ch3_unused", "ch4_unused", "ch5_unused";
+	};
+
+	asiu_clks: asiu_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-asiu-clk";
+		reg = <0x0301d048 0xc>,
+			<0x180aa024 0x4>;
+		clocks = <&osc>;
+		clock-output-names = "keypad", "adc/touch", "pwm";
 	};
 };
diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..2b99e9c 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -134,7 +134,7 @@
 		compatible = "arm,cortex-a9-global-timer";
 		reg = <0x19020200 0x100>;
 		interrupts = <GIC_PPI 11 IRQ_TYPE_LEVEL_HIGH>;
-		clocks = <&periph_clk>;
+		clocks = <&arm_periph_clk>;
 	};
 
 };
-- 
1.7.9.5

[PATCH v4 5/5] ARM: dts: enable clock support for Broadcom Cygnus

[Ray Jui]

Replace current device tree dummy clocks with real clock support for
Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbraden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus-clock.dtsi |  110 ++++++++++++++++++++++++-------
 arch/arm/boot/dts/bcm-cygnus.dtsi       |    2 +-
 2 files changed, 86 insertions(+), 26 deletions(-)

diff --git a/arch/arm/boot/dts/bcm-cygnus-clock.dtsi b/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
index 60d8389..abb8a3f 100644
--- a/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
@@ -36,56 +36,116 @@ clocks {
 	ranges;
 
 	osc: oscillator {
+		#clock-cells = <0>;
 		compatible = "fixed-clock";
-		#clock-cells = <1>;
 		clock-frequency = <25000000>;
 	};
 
-	apb_clk: apb_clk {
-		compatible = "fixed-clock";
+	/* Cygnus ARM PLL */
+	armpll: armpll {
 		#clock-cells = <0>;
-		clock-frequency = <1000000000>;
+		compatible = "brcm,cygnus-armpll";
+		clocks = <&osc>;
+		reg = <0x19000000 0x1000>;
 	};
 
-	periph_clk: periph_clk {
-		compatible = "fixed-clock";
+	/* peripheral clock for system timer */
+	arm_periph_clk: arm_periph_clk {
 		#clock-cells = <0>;
-		clock-frequency = <500000000>;
+		compatible = "fixed-factor-clock";
+		clocks = <&armpll>;
+		clock-div = <2>;
+		clock-mult = <1>;
 	};
 
-	sdio_clk: lcpll_ch2 {
-		compatible = "fixed-clock";
+	/* APB bus clock */
+	apb_clk: apb_clk {
 		#clock-cells = <0>;
-		clock-frequency = <200000000>;
+		compatible = "fixed-factor-clock";
+		clocks = <&armpll>;
+		clock-div = <4>;
+		clock-mult = <1>;
 	};
 
-	axi81_clk: axi81_clk {
-		compatible = "fixed-clock";
+	genpll: genpll {
 		#clock-cells = <0>;
-		clock-frequency = <100000000>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
 	};
 
-	keypad_clk: keypad_clk {
-		compatible = "fixed-clock";
+	/* various clocks running off the GENPLL */
+	genpll_clks: genpll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-genpll-clk";
+		reg = <0x0301d000 0x2c>;
+		clocks = <&genpll>;
+		clock-output-names = "axi21", "250mhz", "ihost_sys",
+			"enet_sw", "audio_125", "can";
+	};
+
+	/* always 1/2 of the axi21 clock */
+	axi41_clk: axi41_clk {
 		#clock-cells = <0>;
-		clock-frequency = <31806>;
+		compatible = "fixed-factor-clock";
+		clocks = <&genpll_clks 0>;
+		clock-div = <2>;
+		clock-mult = <1>;
 	};
 
-	adc_clk: adc_clk {
-		compatible = "fixed-clock";
+	/* always 1/4 of the axi21 clock */
+	axi81_clk: axi81_clk {
 		#clock-cells = <0>;
-		clock-frequency = <1562500>;
+		compatible = "fixed-factor-clock";
+		clocks = <&genpll_clks 0>;
+		clock-div = <4>;
+		clock-mult = <1>;
 	};
 
-	pwm_clk: pwm_clk {
-		compatible = "fixed-clock";
+	lcpll0: lcpll0 {
 		#clock-cells = <0>;
-		clock-frequency = <1000000>;
+		compatible = "brcm,cygnus-lcpll0";
+		reg = <0x0301d02c 0x1c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
 	};
 
-	lcd_clk: mipipll_ch1 {
-		compatible = "fixed-clock";
+	/* various clocks running off the LCPLL0 */
+	lcpll0_clks: lcpll0_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-lcpll0-clk";
+		reg = <0x0301d02c 0x1c>;
+		clocks = <&lcpll0>;
+		clock-output-names = "pcie_phy", "ddr_phy", "sdio",
+			"usb_phy", "smart_card", "ch5";
+	};
+
+	mipipll: mipipll {
 		#clock-cells = <0>;
-		clock-frequency = <100000000>;
+		compatible = "brcm,cygnus-mipipll";
+		reg = <0x180a9800 0x2c>,
+			<0x0301c020 0x4>,
+			<0x180aa024 0x4>;
+		clock-frequency = <2100000000>;
+		clocks = <&osc>;
+	};
+
+	mipipll_clks: mipipll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-mipipll-clk";
+		reg = <0x180a9800 0x2c>;
+		clocks = <&mipipll>;
+		clock-output-names = "ch0_unused", "ch1_lcd", "ch2_unused",
+			"ch3_unused", "ch4_unused", "ch5_unused";
+	};
+
+	asiu_clks: asiu_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-asiu-clk";
+		reg = <0x0301d048 0xc>,
+			<0x180aa024 0x4>;
+		clocks = <&osc>;
+		clock-output-names = "keypad", "adc/touch", "pwm";
 	};
 };
diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..2b99e9c 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -134,7 +134,7 @@
 		compatible = "arm,cortex-a9-global-timer";
 		reg = <0x19020200 0x100>;
 		interrupts = <GIC_PPI 11 IRQ_TYPE_LEVEL_HIGH>;
-		clocks = <&periph_clk>;
+		clocks = <&arm_periph_clk>;
 	};
 
 };
-- 
1.7.9.5

Re: [PATCH v3 3/4] pinctrl: cygnus: add initial IOMUX driver support

[Ray Jui]

On 2/3/2015 9:40 AM, Dmitry Torokhov wrote:
> Hi Ray,
> 
> On Mon, Feb 02, 2015 at 06:01:33PM -0800, Ray Jui wrote:
>> This adds the initial driver support for the Broadcom Cygnus IOMUX
>> controller. The Cygnus IOMUX controller supports group based mux
>> configuration but allows certain pins to be muxed to GPIO individually
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> 
> Just a few random nits/comments...
> 
>> ---
>>  drivers/pinctrl/bcm/Kconfig              |   13 +
>>  drivers/pinctrl/bcm/Makefile             |    5 +-
>>  drivers/pinctrl/bcm/pinctrl-cygnus-mux.c | 1087 ++++++++++++++++++++++++++++++
>>  3 files changed, 1103 insertions(+), 2 deletions(-)
>>  create mode 100644 drivers/pinctrl/bcm/pinctrl-cygnus-mux.c
>>
>> diff --git a/drivers/pinctrl/bcm/Kconfig b/drivers/pinctrl/bcm/Kconfig
>> index bc6d048..eb13201 100644
>> --- a/drivers/pinctrl/bcm/Kconfig
>> +++ b/drivers/pinctrl/bcm/Kconfig
>> @@ -19,3 +19,16 @@ config PINCTRL_BCM2835
>>  	bool
>>  	select PINMUX
>>  	select PINCONF
>> +
>> +config PINCTRL_CYGNUS_MUX
>> +	bool "Broadcom Cygnus IOMUX driver"
>> +	depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
>> +	select PINMUX
>> +	select GENERIC_PINCONF
>> +	default ARCH_BCM_CYGNUS
>> +	help
>> +	  Say yes here to enable the Broadcom Cygnus IOMUX driver.
>> +
>> +	  The Broadcom Cygnus IOMUX driver supports group based IOMUX
>> +	  configuration, with the exception that certain individual pins
>> +	  can be overrided to GPIO function
>> diff --git a/drivers/pinctrl/bcm/Makefile b/drivers/pinctrl/bcm/Makefile
>> index 7ba80a3..bb6beb6 100644
>> --- a/drivers/pinctrl/bcm/Makefile
>> +++ b/drivers/pinctrl/bcm/Makefile
>> @@ -1,4 +1,5 @@
>>  # Broadcom pinctrl support
>>  
>> -obj-$(CONFIG_PINCTRL_BCM281XX)	+= pinctrl-bcm281xx.o
>> -obj-$(CONFIG_PINCTRL_BCM2835)	+= pinctrl-bcm2835.o
>> +obj-$(CONFIG_PINCTRL_BCM281XX)		+= pinctrl-bcm281xx.o
>> +obj-$(CONFIG_PINCTRL_BCM2835)		+= pinctrl-bcm2835.o
>> +obj-$(CONFIG_PINCTRL_CYGNUS_MUX)	+= pinctrl-cygnus-mux.o
>> diff --git a/drivers/pinctrl/bcm/pinctrl-cygnus-mux.c b/drivers/pinctrl/bcm/pinctrl-cygnus-mux.c
>> new file mode 100644
>> index 0000000..33565b4
>> --- /dev/null
>> +++ b/drivers/pinctrl/bcm/pinctrl-cygnus-mux.c
>> @@ -0,0 +1,1087 @@
>> +/* Copyright (C) 2014-2015 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + *
>> + * This file contains the Cygnus IOMUX driver that supports group based PINMUX
>> + * configuration. Although PINMUX configuration is mainly group based, the
>> + * Cygnus IOMUX controller allows certain pins to be individually muxed to GPIO
>> + * function, and therefore be controlled by the Cygnus ASIU GPIO controller
>> + */
>> +
>> +#include <linux/err.h>
>> +#include <linux/io.h>
>> +#include <linux/module.h>
>> +#include <linux/of.h>
>> +#include <linux/slab.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/pinctrl/pinctrl.h>
>> +#include <linux/pinctrl/pinmux.h>
>> +#include <linux/pinctrl/pinconf.h>
>> +#include <linux/pinctrl/pinconf-generic.h>
>> +#include "../core.h"
>> +#include "../pinctrl-utils.h"
>> +
>> +#define CYGNUS_NUM_IOMUX_REGS     8
>> +#define CYGNUS_NUM_MUX_PER_REG    8
>> +#define CYGNUS_NUM_IOMUX          (CYGNUS_NUM_IOMUX_REGS * \
>> +				   CYGNUS_NUM_MUX_PER_REG)
>> +
>> +/*
>> + * Cygnus IOMUX register description
>> + *
>> + * @offset: register offset for mux configuration of a group
>> + * @shift: bit shift for mux configuration of a group
>> + * @alt: alternate function to set to
>> + */
>> +struct cygnus_mux {
>> +	unsigned int offset;
>> +	unsigned int shift;
>> +	unsigned int alt;
>> +};
>> +
>> +/*
>> + * Keep track of Cygnus IOMUX configuration and prevent double configuration
>> + *
>> + * @cygnus_mux: Cygnus IOMUX register description
>> + * @is_configured: flag to indicate whether a mux setting has already been
>> + * configured
>> + */
>> +struct cygnus_mux_log {
>> +	struct cygnus_mux mux;
>> +	bool is_configured;
>> +};
>> +
>> +/*
>> + * Group based IOMUX configuration
>> + *
>> + * @name: name of the group
>> + * @pins: array of pins used by this group
>> + * @num_pins: total number of pins used by this group
>> + * @mux: Cygnus group based IOMUX configuration
>> + */
>> +struct cygnus_pin_group {
>> +	const char *name;
>> +	const unsigned *pins;
>> +	const unsigned num_pins;
>> +	const struct cygnus_mux mux;
> 
> Not: the last 2 consts are quite weird - if you want to make an instance
> of cygnus_pin_group immutable you declare it as a const (and I see you
> are already doing that below). With the structure as it laid out
> currently you can only do static initializers.
> 
Right. I'll remove the last two const.

>> +};
>> +
>> +/*
>> + * Cygnus mux function and supported pin groups
>> + *
>> + * @name: name of the function
>> + * @groups: array of groups that can be supported by this function
>> + * @num_groups: total number of groups that can be supported by this function
>> + */
>> +struct cygnus_pin_function {
>> +	const char *name;
>> +	const char * const *groups;
>> +	const unsigned num_groups;
> 
> Here as well.
> 
> ...
> 
Yes. Will remove the last const.

>> +
>> +/*
>> + * List of pins in Cygnus
>> + */
>> +static struct cygnus_pin cygnus_pins[] = {
> 
> const?
> 
I cannot make it const here, since the address of "gpio_mux" is later
passed to pinctrl_pin_desc's private data:

pins[i].drv_data = &cygnus_pins[i].gpio_mux;

>> +	CYGNUS_PIN_DESC(0, "ext_device_reset_n", 0, 0, 0),
>> +	CYGNUS_PIN_DESC(1, "chip_mode0", 0, 0, 0),
> 
> ...
> 
>> +#define CYGNUS_PIN_GROUP(group_name, off, sh, al)	\
>> +{							\
>> +	.name = #group_name"""_grp",			\
> 
> Why do we need extra pair of quotes? BTW we can also do
> 
> 	.name = __stringify(group_name) "_grp",
> 
Okay. I will change to use __stringify. Thanks.

>> +	.pins = group_name ## _pins,			\
>> +	.num_pins = ARRAY_SIZE(group_name ## _pins),	\
>> +	.mux = {					\
>> +		.offset = off,				\
>> +		.shift = sh,				\
>> +		.alt = al,				\
>> +	}						\
>> +}
> 
> ...
> 
>> +
>> +static struct pinctrl_ops cygnus_pinctrl_ops = {
> 
> const?
> 
Yes.

>> +	.get_groups_count = cygnus_get_groups_count,
>> +	.get_group_name = cygnus_get_group_name,
>> +	.get_group_pins = cygnus_get_group_pins,
>> +	.pin_dbg_show = cygnus_pin_dbg_show,
>> +	.dt_node_to_map = cygnus_dt_node_to_map,
>> +	.dt_free_map = pinctrl_utils_dt_free_map,
>> +};
>> +
>> +static int cygnus_get_functions_count(struct pinctrl_dev *pctrl_dev)
>> +{
>> +	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
>> +
>> +	return pinctrl->num_functions;
>> +}
>> +
>> +static const char *cygnus_get_function_name(struct pinctrl_dev *pctrl_dev,
>> +					    unsigned selector)
>> +{
>> +	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
>> +
>> +	return pinctrl->functions[selector].name;
>> +}
>> +
>> +static int cygnus_get_function_groups(struct pinctrl_dev *pctrl_dev,
>> +				      unsigned selector,
>> +				      const char * const **groups,
>> +				      unsigned * const num_groups)
>> +{
>> +	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
>> +
>> +	*groups = pinctrl->functions[selector].groups;
>> +	*num_groups = pinctrl->functions[selector].num_groups;
>> +
>> +	return 0;
>> +}
>> +
>> +static int cygnus_pinmux_set(struct cygnus_pinctrl *pinctrl,
>> +			     const struct cygnus_pin_function *func,
>> +			     const struct cygnus_pin_group *grp,
>> +			     struct cygnus_mux_log *mux_log)
>> +{
>> +	const struct cygnus_mux *mux = &grp->mux;
>> +	int i;
>> +	u32 val, mask = 0x7;
>> +	unsigned long flags;
>> +
>> +	for (i = 0; i < CYGNUS_NUM_IOMUX; i++) {
>> +		if (mux->offset != mux_log[i].mux.offset ||
>> +		    mux->shift != mux_log[i].mux.shift)
>> +			continue;
>> +
>> +		/* match found if we reach here */
>> +
>> +		/* if this is a new configuration, just do it! */
>> +		if (!mux_log[i].is_configured)
>> +			break;
>> +
>> +		/*
>> +		 * IOMUX has been configured previously and one is trying to
>> +		 * configure it to a different function
>> +		 */
>> +		if (mux_log[i].mux.alt != mux->alt) {
>> +			dev_err(pinctrl->dev,
>> +				"double configuration error detected!\n");
>> +			dev_err(pinctrl->dev, "func:%s grp:%s\n",
>> +				func->name, grp->name);
>> +			return -EINVAL;
>> +		} else {
>> +			/*
>> +			 * One tries to configure it to the same function.
>> +			 * Just quit and don't bother
>> +			 */
>> +			return 0;
>> +		}
>> +	}
>> +
>> +	mux_log[i].mux.alt = mux->alt;
>> +	mux_log[i].is_configured = true;
>> +
>> +	spin_lock_irqsave(&pinctrl->lock, flags);
>> +
>> +	val = readl(pinctrl->base0 + grp->mux.offset);
>> +	val &= ~(mask << grp->mux.shift);
>> +	val |= grp->mux.alt << grp->mux.shift;
>> +	writel(val, pinctrl->base0 + grp->mux.offset);
>> +
>> +	spin_unlock_irqrestore(&pinctrl->lock, flags);
>> +
>> +	return 0;
>> +}
>> +
>> +static int cygnus_pinmux_set_mux(struct pinctrl_dev *pctrl_dev,
>> +				 unsigned func_select, unsigned grp_select)
>> +{
>> +	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
>> +	const struct cygnus_pin_function *func =
>> +		&pinctrl->functions[func_select];
>> +	const struct cygnus_pin_group *grp = &pinctrl->groups[grp_select];
>> +
>> +	dev_dbg(pctrl_dev->dev, "func:%u name:%s grp:%u name:%s\n",
>> +		func_select, func->name, grp_select, grp->name);
>> +
>> +	dev_dbg(pctrl_dev->dev, "offset:0x%08x shift:%u alt:%u\n",
>> +		grp->mux.offset, grp->mux.shift, grp->mux.alt);
>> +
>> +	return cygnus_pinmux_set(pinctrl, func, grp, pinctrl->mux_log);
>> +}
>> +
>> +static int cygnus_gpio_request_enable(struct pinctrl_dev *pctrl_dev,
>> +				      struct pinctrl_gpio_range *range,
>> +				      unsigned pin)
>> +{
>> +	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
>> +	struct cygnus_gpio_mux *mux = pctrl_dev->desc->pins[pin].drv_data;
> 
> const?
> 
Yes.

>> +	u32 val;
>> +	unsigned long flags;
>> +
>> +	/* not all pins support GPIO pinmux override */
>> +	if (!mux->is_supported)
>> +		return -ENOTSUPP;
>> +
>> +	spin_lock_irqsave(&pinctrl->lock, flags);
>> +
>> +	val = readl(pinctrl->base1 + mux->offset);
>> +	val |= 0x3 << mux->shift;
>> +	writel(val, pinctrl->base1 + mux->offset);
>> +
>> +	spin_unlock_irqrestore(&pinctrl->lock, flags);
>> +
>> +	dev_dbg(pctrl_dev->dev,
>> +		"gpio request enable pin=%u offset=0x%x shift=%u\n",
>> +		pin, mux->offset, mux->shift);
>> +
>> +	return 0;
>> +}
>> +
>> +static void cygnus_gpio_disable_free(struct pinctrl_dev *pctrl_dev,
>> +				     struct pinctrl_gpio_range *range,
>> +				     unsigned pin)
>> +{
>> +	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
>> +	struct cygnus_gpio_mux *mux = pctrl_dev->desc->pins[pin].drv_data;
>> +	u32 val;
>> +	unsigned long flags;
>> +
>> +	if (!mux->is_supported)
>> +		return;
>> +
>> +	spin_lock_irqsave(&pinctrl->lock, flags);
>> +
>> +	val = readl(pinctrl->base1 + mux->offset);
>> +	val &= ~(0x3 << mux->shift);
>> +	writel(val, pinctrl->base1 + mux->offset);
>> +
>> +	spin_unlock_irqrestore(&pinctrl->lock, flags);
>> +
>> +	dev_err(pctrl_dev->dev,
>> +		"gpio disable free pin=%u offset=0x%x shift=%u\n",
>> +		pin, mux->offset, mux->shift);
>> +}
>> +
>> +static struct pinmux_ops cygnus_pinmux_ops = {
> 
> const?
> 
Yes.

>> +	.get_functions_count = cygnus_get_functions_count,
>> +	.get_function_name = cygnus_get_function_name,
>> +	.get_function_groups = cygnus_get_function_groups,
>> +	.set_mux = cygnus_pinmux_set_mux,
>> +	.gpio_request_enable = cygnus_gpio_request_enable,
>> +	.gpio_disable_free = cygnus_gpio_disable_free,
>> +};
>> +
>> +static struct pinctrl_desc cygnus_pinctrl_desc = {
>> +	.name = "cygnus-pinmux",
>> +	.pctlops = &cygnus_pinctrl_ops,
>> +	.pmxops = &cygnus_pinmux_ops,
>> +};
>> +
>> +static int cygnus_mux_log_init(struct cygnus_pinctrl *pinctrl)
>> +{
>> +	struct cygnus_mux_log *log;
>> +	unsigned int i, j;
>> +
>> +	pinctrl->mux_log = devm_kcalloc(pinctrl->dev, CYGNUS_NUM_IOMUX,
>> +					sizeof(struct cygnus_mux_log),
>> +					GFP_KERNEL);
>> +	if (!pinctrl->mux_log)
>> +		return -ENOMEM;
>> +
>> +	log = pinctrl->mux_log;
>> +	for (i = 0; i < CYGNUS_NUM_IOMUX_REGS; i++) {
>> +		for (j = 0; j < CYGNUS_NUM_MUX_PER_REG; j++) {
>> +			log = &pinctrl->mux_log[i * CYGNUS_NUM_MUX_PER_REG
>> +				+ j];
>> +			log->mux.offset = i * 4;
>> +			log->mux.shift = j * 4;
>> +			log->mux.alt = 0;
>> +			log->is_configured = false;
>> +		}
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static int cygnus_pinmux_probe(struct platform_device *pdev)
>> +{
>> +	struct cygnus_pinctrl *pinctrl;
>> +	struct resource *res;
>> +	int i, ret;
>> +	struct pinctrl_pin_desc *pins;
>> +	unsigned num_pins = ARRAY_SIZE(cygnus_pins);
>> +
>> +	pinctrl = devm_kzalloc(&pdev->dev, sizeof(*pinctrl), GFP_KERNEL);
>> +	if (!pinctrl)
>> +		return -ENOMEM;
>> +
>> +	pinctrl->dev = &pdev->dev;
>> +	platform_set_drvdata(pdev, pinctrl);
>> +	spin_lock_init(&pinctrl->lock);
>> +
>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +	pinctrl->base0 = devm_ioremap_resource(&pdev->dev, res);
>> +	if (IS_ERR(pinctrl->base0)) {
>> +		dev_err(&pdev->dev, "unable to map I/O space\n");
>> +		return PTR_ERR(pinctrl->base0);
>> +	}
>> +
>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
>> +	pinctrl->base1 = devm_ioremap_resource(&pdev->dev, res);
>> +	if (IS_ERR(pinctrl->base1)) {
>> +		dev_err(&pdev->dev, "unable to map I/O space\n");
>> +		return PTR_ERR(pinctrl->base1);
>> +	}
>> +
>> +	ret = cygnus_mux_log_init(pinctrl);
>> +	if (ret) {
>> +		dev_err(&pdev->dev, "unable to initialize IOMUX log\n");
>> +		return ret;
>> +	}
>> +
>> +	pins = devm_kcalloc(&pdev->dev, num_pins, sizeof(*pins), GFP_KERNEL);
>> +	if (!pins)
>> +		return -ENOMEM;
>> +
>> +	for (i = 0; i < num_pins; i++) {
>> +		pins[i].number = cygnus_pins[i].pin;
>> +		pins[i].name = cygnus_pins[i].name;
>> +		pins[i].drv_data = &cygnus_pins[i].gpio_mux;
>> +	}
>> +
>> +	pinctrl->groups = cygnus_pin_groups;
>> +	pinctrl->num_groups = ARRAY_SIZE(cygnus_pin_groups);
>> +	pinctrl->functions = cygnus_pin_functions;
>> +	pinctrl->num_functions = ARRAY_SIZE(cygnus_pin_functions);
>> +	cygnus_pinctrl_desc.pins = pins;
>> +	cygnus_pinctrl_desc.npins = num_pins;
>> +
>> +	pinctrl->pctl = pinctrl_register(&cygnus_pinctrl_desc, &pdev->dev,
>> +			pinctrl);
>> +	if (!pinctrl->pctl) {
>> +		dev_err(&pdev->dev, "unable to register Cygnus IOMUX pinctrl\n");
>> +		return -EINVAL;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static struct of_device_id cygnus_pinmux_of_match[] = {
>> +	{ .compatible = "brcm,cygnus-pinmux" },
>> +	{ }
>> +};
>> +
>> +static struct platform_driver cygnus_pinmux_driver = {
>> +	.driver = {
>> +		.name = "cygnus-pinmux",
>> +		.of_match_table = cygnus_pinmux_of_match,
>> +	},
>> +	.probe = cygnus_pinmux_probe,
> 
> You also need to either provide remove() method or disallow unbinding
> via sysfs by setting suppress_bind_attrs in platform driver.
> 
I do not expect this driver to ever be compiled as module and
uninstalled at runtime. I'll add .suppress_bind_attrs = true, thanks!
>> +};
>> +
>> +static int __init cygnus_pinmux_init(void)
>> +{
>> +	return platform_driver_register(&cygnus_pinmux_driver);
>> +}
>> +arch_initcall(cygnus_pinmux_init);
>> +
>> +MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
>> +MODULE_DESCRIPTION("Broadcom Cygnus IOMUX driver");
>> +MODULE_LICENSE("GPL v2");
>> -- 
>> 1.7.9.5
>>
> 
> Thanks.
> 
Thanks for the review!

Ray

Re: [PATCH v3 3/4] pinctrl: cygnus: add initial IOMUX driver support

[Ray Jui]

On 2/3/2015 9:40 AM, Dmitry Torokhov wrote:
> Hi Ray,
> 
> On Mon, Feb 02, 2015 at 06:01:33PM -0800, Ray Jui wrote:
>> This adds the initial driver support for the Broadcom Cygnus IOMUX
>> controller. The Cygnus IOMUX controller supports group based mux
>> configuration but allows certain pins to be muxed to GPIO individually
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> 
> Just a few random nits/comments...
> 
>> ---
>>  drivers/pinctrl/bcm/Kconfig              |   13 +
>>  drivers/pinctrl/bcm/Makefile             |    5 +-
>>  drivers/pinctrl/bcm/pinctrl-cygnus-mux.c | 1087 ++++++++++++++++++++++++++++++
>>  3 files changed, 1103 insertions(+), 2 deletions(-)
>>  create mode 100644 drivers/pinctrl/bcm/pinctrl-cygnus-mux.c
>>
>> diff --git a/drivers/pinctrl/bcm/Kconfig b/drivers/pinctrl/bcm/Kconfig
>> index bc6d048..eb13201 100644
>> --- a/drivers/pinctrl/bcm/Kconfig
>> +++ b/drivers/pinctrl/bcm/Kconfig
>> @@ -19,3 +19,16 @@ config PINCTRL_BCM2835
>>  	bool
>>  	select PINMUX
>>  	select PINCONF
>> +
>> +config PINCTRL_CYGNUS_MUX
>> +	bool "Broadcom Cygnus IOMUX driver"
>> +	depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
>> +	select PINMUX
>> +	select GENERIC_PINCONF
>> +	default ARCH_BCM_CYGNUS
>> +	help
>> +	  Say yes here to enable the Broadcom Cygnus IOMUX driver.
>> +
>> +	  The Broadcom Cygnus IOMUX driver supports group based IOMUX
>> +	  configuration, with the exception that certain individual pins
>> +	  can be overrided to GPIO function
>> diff --git a/drivers/pinctrl/bcm/Makefile b/drivers/pinctrl/bcm/Makefile
>> index 7ba80a3..bb6beb6 100644
>> --- a/drivers/pinctrl/bcm/Makefile
>> +++ b/drivers/pinctrl/bcm/Makefile
>> @@ -1,4 +1,5 @@
>>  # Broadcom pinctrl support
>>  
>> -obj-$(CONFIG_PINCTRL_BCM281XX)	+= pinctrl-bcm281xx.o
>> -obj-$(CONFIG_PINCTRL_BCM2835)	+= pinctrl-bcm2835.o
>> +obj-$(CONFIG_PINCTRL_BCM281XX)		+= pinctrl-bcm281xx.o
>> +obj-$(CONFIG_PINCTRL_BCM2835)		+= pinctrl-bcm2835.o
>> +obj-$(CONFIG_PINCTRL_CYGNUS_MUX)	+= pinctrl-cygnus-mux.o
>> diff --git a/drivers/pinctrl/bcm/pinctrl-cygnus-mux.c b/drivers/pinctrl/bcm/pinctrl-cygnus-mux.c
>> new file mode 100644
>> index 0000000..33565b4
>> --- /dev/null
>> +++ b/drivers/pinctrl/bcm/pinctrl-cygnus-mux.c
>> @@ -0,0 +1,1087 @@
>> +/* Copyright (C) 2014-2015 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + *
>> + * This file contains the Cygnus IOMUX driver that supports group based PINMUX
>> + * configuration. Although PINMUX configuration is mainly group based, the
>> + * Cygnus IOMUX controller allows certain pins to be individually muxed to GPIO
>> + * function, and therefore be controlled by the Cygnus ASIU GPIO controller
>> + */
>> +
>> +#include <linux/err.h>
>> +#include <linux/io.h>
>> +#include <linux/module.h>
>> +#include <linux/of.h>
>> +#include <linux/slab.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/pinctrl/pinctrl.h>
>> +#include <linux/pinctrl/pinmux.h>
>> +#include <linux/pinctrl/pinconf.h>
>> +#include <linux/pinctrl/pinconf-generic.h>
>> +#include "../core.h"
>> +#include "../pinctrl-utils.h"
>> +
>> +#define CYGNUS_NUM_IOMUX_REGS     8
>> +#define CYGNUS_NUM_MUX_PER_REG    8
>> +#define CYGNUS_NUM_IOMUX          (CYGNUS_NUM_IOMUX_REGS * \
>> +				   CYGNUS_NUM_MUX_PER_REG)
>> +
>> +/*
>> + * Cygnus IOMUX register description
>> + *
>> + * @offset: register offset for mux configuration of a group
>> + * @shift: bit shift for mux configuration of a group
>> + * @alt: alternate function to set to
>> + */
>> +struct cygnus_mux {
>> +	unsigned int offset;
>> +	unsigned int shift;
>> +	unsigned int alt;
>> +};
>> +
>> +/*
>> + * Keep track of Cygnus IOMUX configuration and prevent double configuration
>> + *
>> + * @cygnus_mux: Cygnus IOMUX register description
>> + * @is_configured: flag to indicate whether a mux setting has already been
>> + * configured
>> + */
>> +struct cygnus_mux_log {
>> +	struct cygnus_mux mux;
>> +	bool is_configured;
>> +};
>> +
>> +/*
>> + * Group based IOMUX configuration
>> + *
>> + * @name: name of the group
>> + * @pins: array of pins used by this group
>> + * @num_pins: total number of pins used by this group
>> + * @mux: Cygnus group based IOMUX configuration
>> + */
>> +struct cygnus_pin_group {
>> +	const char *name;
>> +	const unsigned *pins;
>> +	const unsigned num_pins;
>> +	const struct cygnus_mux mux;
> 
> Not: the last 2 consts are quite weird - if you want to make an instance
> of cygnus_pin_group immutable you declare it as a const (and I see you
> are already doing that below). With the structure as it laid out
> currently you can only do static initializers.
> 
Right. I'll remove the last two const.

>> +};
>> +
>> +/*
>> + * Cygnus mux function and supported pin groups
>> + *
>> + * @name: name of the function
>> + * @groups: array of groups that can be supported by this function
>> + * @num_groups: total number of groups that can be supported by this function
>> + */
>> +struct cygnus_pin_function {
>> +	const char *name;
>> +	const char * const *groups;
>> +	const unsigned num_groups;
> 
> Here as well.
> 
> ...
> 
Yes. Will remove the last const.

>> +
>> +/*
>> + * List of pins in Cygnus
>> + */
>> +static struct cygnus_pin cygnus_pins[] = {
> 
> const?
> 
I cannot make it const here, since the address of "gpio_mux" is later
passed to pinctrl_pin_desc's private data:

pins[i].drv_data = &cygnus_pins[i].gpio_mux;

>> +	CYGNUS_PIN_DESC(0, "ext_device_reset_n", 0, 0, 0),
>> +	CYGNUS_PIN_DESC(1, "chip_mode0", 0, 0, 0),
> 
> ...
> 
>> +#define CYGNUS_PIN_GROUP(group_name, off, sh, al)	\
>> +{							\
>> +	.name = #group_name"""_grp",			\
> 
> Why do we need extra pair of quotes? BTW we can also do
> 
> 	.name = __stringify(group_name) "_grp",
> 
Okay. I will change to use __stringify. Thanks.

>> +	.pins = group_name ## _pins,			\
>> +	.num_pins = ARRAY_SIZE(group_name ## _pins),	\
>> +	.mux = {					\
>> +		.offset = off,				\
>> +		.shift = sh,				\
>> +		.alt = al,				\
>> +	}						\
>> +}
> 
> ...
> 
>> +
>> +static struct pinctrl_ops cygnus_pinctrl_ops = {
> 
> const?
> 
Yes.

>> +	.get_groups_count = cygnus_get_groups_count,
>> +	.get_group_name = cygnus_get_group_name,
>> +	.get_group_pins = cygnus_get_group_pins,
>> +	.pin_dbg_show = cygnus_pin_dbg_show,
>> +	.dt_node_to_map = cygnus_dt_node_to_map,
>> +	.dt_free_map = pinctrl_utils_dt_free_map,
>> +};
>> +
>> +static int cygnus_get_functions_count(struct pinctrl_dev *pctrl_dev)
>> +{
>> +	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
>> +
>> +	return pinctrl->num_functions;
>> +}
>> +
>> +static const char *cygnus_get_function_name(struct pinctrl_dev *pctrl_dev,
>> +					    unsigned selector)
>> +{
>> +	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
>> +
>> +	return pinctrl->functions[selector].name;
>> +}
>> +
>> +static int cygnus_get_function_groups(struct pinctrl_dev *pctrl_dev,
>> +				      unsigned selector,
>> +				      const char * const **groups,
>> +				      unsigned * const num_groups)
>> +{
>> +	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
>> +
>> +	*groups = pinctrl->functions[selector].groups;
>> +	*num_groups = pinctrl->functions[selector].num_groups;
>> +
>> +	return 0;
>> +}
>> +
>> +static int cygnus_pinmux_set(struct cygnus_pinctrl *pinctrl,
>> +			     const struct cygnus_pin_function *func,
>> +			     const struct cygnus_pin_group *grp,
>> +			     struct cygnus_mux_log *mux_log)
>> +{
>> +	const struct cygnus_mux *mux = &grp->mux;
>> +	int i;
>> +	u32 val, mask = 0x7;
>> +	unsigned long flags;
>> +
>> +	for (i = 0; i < CYGNUS_NUM_IOMUX; i++) {
>> +		if (mux->offset != mux_log[i].mux.offset ||
>> +		    mux->shift != mux_log[i].mux.shift)
>> +			continue;
>> +
>> +		/* match found if we reach here */
>> +
>> +		/* if this is a new configuration, just do it! */
>> +		if (!mux_log[i].is_configured)
>> +			break;
>> +
>> +		/*
>> +		 * IOMUX has been configured previously and one is trying to
>> +		 * configure it to a different function
>> +		 */
>> +		if (mux_log[i].mux.alt != mux->alt) {
>> +			dev_err(pinctrl->dev,
>> +				"double configuration error detected!\n");
>> +			dev_err(pinctrl->dev, "func:%s grp:%s\n",
>> +				func->name, grp->name);
>> +			return -EINVAL;
>> +		} else {
>> +			/*
>> +			 * One tries to configure it to the same function.
>> +			 * Just quit and don't bother
>> +			 */
>> +			return 0;
>> +		}
>> +	}
>> +
>> +	mux_log[i].mux.alt = mux->alt;
>> +	mux_log[i].is_configured = true;
>> +
>> +	spin_lock_irqsave(&pinctrl->lock, flags);
>> +
>> +	val = readl(pinctrl->base0 + grp->mux.offset);
>> +	val &= ~(mask << grp->mux.shift);
>> +	val |= grp->mux.alt << grp->mux.shift;
>> +	writel(val, pinctrl->base0 + grp->mux.offset);
>> +
>> +	spin_unlock_irqrestore(&pinctrl->lock, flags);
>> +
>> +	return 0;
>> +}
>> +
>> +static int cygnus_pinmux_set_mux(struct pinctrl_dev *pctrl_dev,
>> +				 unsigned func_select, unsigned grp_select)
>> +{
>> +	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
>> +	const struct cygnus_pin_function *func =
>> +		&pinctrl->functions[func_select];
>> +	const struct cygnus_pin_group *grp = &pinctrl->groups[grp_select];
>> +
>> +	dev_dbg(pctrl_dev->dev, "func:%u name:%s grp:%u name:%s\n",
>> +		func_select, func->name, grp_select, grp->name);
>> +
>> +	dev_dbg(pctrl_dev->dev, "offset:0x%08x shift:%u alt:%u\n",
>> +		grp->mux.offset, grp->mux.shift, grp->mux.alt);
>> +
>> +	return cygnus_pinmux_set(pinctrl, func, grp, pinctrl->mux_log);
>> +}
>> +
>> +static int cygnus_gpio_request_enable(struct pinctrl_dev *pctrl_dev,
>> +				      struct pinctrl_gpio_range *range,
>> +				      unsigned pin)
>> +{
>> +	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
>> +	struct cygnus_gpio_mux *mux = pctrl_dev->desc->pins[pin].drv_data;
> 
> const?
> 
Yes.

>> +	u32 val;
>> +	unsigned long flags;
>> +
>> +	/* not all pins support GPIO pinmux override */
>> +	if (!mux->is_supported)
>> +		return -ENOTSUPP;
>> +
>> +	spin_lock_irqsave(&pinctrl->lock, flags);
>> +
>> +	val = readl(pinctrl->base1 + mux->offset);
>> +	val |= 0x3 << mux->shift;
>> +	writel(val, pinctrl->base1 + mux->offset);
>> +
>> +	spin_unlock_irqrestore(&pinctrl->lock, flags);
>> +
>> +	dev_dbg(pctrl_dev->dev,
>> +		"gpio request enable pin=%u offset=0x%x shift=%u\n",
>> +		pin, mux->offset, mux->shift);
>> +
>> +	return 0;
>> +}
>> +
>> +static void cygnus_gpio_disable_free(struct pinctrl_dev *pctrl_dev,
>> +				     struct pinctrl_gpio_range *range,
>> +				     unsigned pin)
>> +{
>> +	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
>> +	struct cygnus_gpio_mux *mux = pctrl_dev->desc->pins[pin].drv_data;
>> +	u32 val;
>> +	unsigned long flags;
>> +
>> +	if (!mux->is_supported)
>> +		return;
>> +
>> +	spin_lock_irqsave(&pinctrl->lock, flags);
>> +
>> +	val = readl(pinctrl->base1 + mux->offset);
>> +	val &= ~(0x3 << mux->shift);
>> +	writel(val, pinctrl->base1 + mux->offset);
>> +
>> +	spin_unlock_irqrestore(&pinctrl->lock, flags);
>> +
>> +	dev_err(pctrl_dev->dev,
>> +		"gpio disable free pin=%u offset=0x%x shift=%u\n",
>> +		pin, mux->offset, mux->shift);
>> +}
>> +
>> +static struct pinmux_ops cygnus_pinmux_ops = {
> 
> const?
> 
Yes.

>> +	.get_functions_count = cygnus_get_functions_count,
>> +	.get_function_name = cygnus_get_function_name,
>> +	.get_function_groups = cygnus_get_function_groups,
>> +	.set_mux = cygnus_pinmux_set_mux,
>> +	.gpio_request_enable = cygnus_gpio_request_enable,
>> +	.gpio_disable_free = cygnus_gpio_disable_free,
>> +};
>> +
>> +static struct pinctrl_desc cygnus_pinctrl_desc = {
>> +	.name = "cygnus-pinmux",
>> +	.pctlops = &cygnus_pinctrl_ops,
>> +	.pmxops = &cygnus_pinmux_ops,
>> +};
>> +
>> +static int cygnus_mux_log_init(struct cygnus_pinctrl *pinctrl)
>> +{
>> +	struct cygnus_mux_log *log;
>> +	unsigned int i, j;
>> +
>> +	pinctrl->mux_log = devm_kcalloc(pinctrl->dev, CYGNUS_NUM_IOMUX,
>> +					sizeof(struct cygnus_mux_log),
>> +					GFP_KERNEL);
>> +	if (!pinctrl->mux_log)
>> +		return -ENOMEM;
>> +
>> +	log = pinctrl->mux_log;
>> +	for (i = 0; i < CYGNUS_NUM_IOMUX_REGS; i++) {
>> +		for (j = 0; j < CYGNUS_NUM_MUX_PER_REG; j++) {
>> +			log = &pinctrl->mux_log[i * CYGNUS_NUM_MUX_PER_REG
>> +				+ j];
>> +			log->mux.offset = i * 4;
>> +			log->mux.shift = j * 4;
>> +			log->mux.alt = 0;
>> +			log->is_configured = false;
>> +		}
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static int cygnus_pinmux_probe(struct platform_device *pdev)
>> +{
>> +	struct cygnus_pinctrl *pinctrl;
>> +	struct resource *res;
>> +	int i, ret;
>> +	struct pinctrl_pin_desc *pins;
>> +	unsigned num_pins = ARRAY_SIZE(cygnus_pins);
>> +
>> +	pinctrl = devm_kzalloc(&pdev->dev, sizeof(*pinctrl), GFP_KERNEL);
>> +	if (!pinctrl)
>> +		return -ENOMEM;
>> +
>> +	pinctrl->dev = &pdev->dev;
>> +	platform_set_drvdata(pdev, pinctrl);
>> +	spin_lock_init(&pinctrl->lock);
>> +
>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +	pinctrl->base0 = devm_ioremap_resource(&pdev->dev, res);
>> +	if (IS_ERR(pinctrl->base0)) {
>> +		dev_err(&pdev->dev, "unable to map I/O space\n");
>> +		return PTR_ERR(pinctrl->base0);
>> +	}
>> +
>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
>> +	pinctrl->base1 = devm_ioremap_resource(&pdev->dev, res);
>> +	if (IS_ERR(pinctrl->base1)) {
>> +		dev_err(&pdev->dev, "unable to map I/O space\n");
>> +		return PTR_ERR(pinctrl->base1);
>> +	}
>> +
>> +	ret = cygnus_mux_log_init(pinctrl);
>> +	if (ret) {
>> +		dev_err(&pdev->dev, "unable to initialize IOMUX log\n");
>> +		return ret;
>> +	}
>> +
>> +	pins = devm_kcalloc(&pdev->dev, num_pins, sizeof(*pins), GFP_KERNEL);
>> +	if (!pins)
>> +		return -ENOMEM;
>> +
>> +	for (i = 0; i < num_pins; i++) {
>> +		pins[i].number = cygnus_pins[i].pin;
>> +		pins[i].name = cygnus_pins[i].name;
>> +		pins[i].drv_data = &cygnus_pins[i].gpio_mux;
>> +	}
>> +
>> +	pinctrl->groups = cygnus_pin_groups;
>> +	pinctrl->num_groups = ARRAY_SIZE(cygnus_pin_groups);
>> +	pinctrl->functions = cygnus_pin_functions;
>> +	pinctrl->num_functions = ARRAY_SIZE(cygnus_pin_functions);
>> +	cygnus_pinctrl_desc.pins = pins;
>> +	cygnus_pinctrl_desc.npins = num_pins;
>> +
>> +	pinctrl->pctl = pinctrl_register(&cygnus_pinctrl_desc, &pdev->dev,
>> +			pinctrl);
>> +	if (!pinctrl->pctl) {
>> +		dev_err(&pdev->dev, "unable to register Cygnus IOMUX pinctrl\n");
>> +		return -EINVAL;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static struct of_device_id cygnus_pinmux_of_match[] = {
>> +	{ .compatible = "brcm,cygnus-pinmux" },
>> +	{ }
>> +};
>> +
>> +static struct platform_driver cygnus_pinmux_driver = {
>> +	.driver = {
>> +		.name = "cygnus-pinmux",
>> +		.of_match_table = cygnus_pinmux_of_match,
>> +	},
>> +	.probe = cygnus_pinmux_probe,
> 
> You also need to either provide remove() method or disallow unbinding
> via sysfs by setting suppress_bind_attrs in platform driver.
> 
I do not expect this driver to ever be compiled as module and
uninstalled at runtime. I'll add .suppress_bind_attrs = true, thanks!
>> +};
>> +
>> +static int __init cygnus_pinmux_init(void)
>> +{
>> +	return platform_driver_register(&cygnus_pinmux_driver);
>> +}
>> +arch_initcall(cygnus_pinmux_init);
>> +
>> +MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
>> +MODULE_DESCRIPTION("Broadcom Cygnus IOMUX driver");
>> +MODULE_LICENSE("GPL v2");
>> -- 
>> 1.7.9.5
>>
> 
> Thanks.
> 
Thanks for the review!

Ray

[PATCH v3 3/4] pinctrl: cygnus: add initial IOMUX driver support

[Ray Jui]

On 2/3/2015 9:40 AM, Dmitry Torokhov wrote:
> Hi Ray,
> 
> On Mon, Feb 02, 2015 at 06:01:33PM -0800, Ray Jui wrote:
>> This adds the initial driver support for the Broadcom Cygnus IOMUX
>> controller. The Cygnus IOMUX controller supports group based mux
>> configuration but allows certain pins to be muxed to GPIO individually
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> 
> Just a few random nits/comments...
> 
>> ---
>>  drivers/pinctrl/bcm/Kconfig              |   13 +
>>  drivers/pinctrl/bcm/Makefile             |    5 +-
>>  drivers/pinctrl/bcm/pinctrl-cygnus-mux.c | 1087 ++++++++++++++++++++++++++++++
>>  3 files changed, 1103 insertions(+), 2 deletions(-)
>>  create mode 100644 drivers/pinctrl/bcm/pinctrl-cygnus-mux.c
>>
>> diff --git a/drivers/pinctrl/bcm/Kconfig b/drivers/pinctrl/bcm/Kconfig
>> index bc6d048..eb13201 100644
>> --- a/drivers/pinctrl/bcm/Kconfig
>> +++ b/drivers/pinctrl/bcm/Kconfig
>> @@ -19,3 +19,16 @@ config PINCTRL_BCM2835
>>  	bool
>>  	select PINMUX
>>  	select PINCONF
>> +
>> +config PINCTRL_CYGNUS_MUX
>> +	bool "Broadcom Cygnus IOMUX driver"
>> +	depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
>> +	select PINMUX
>> +	select GENERIC_PINCONF
>> +	default ARCH_BCM_CYGNUS
>> +	help
>> +	  Say yes here to enable the Broadcom Cygnus IOMUX driver.
>> +
>> +	  The Broadcom Cygnus IOMUX driver supports group based IOMUX
>> +	  configuration, with the exception that certain individual pins
>> +	  can be overrided to GPIO function
>> diff --git a/drivers/pinctrl/bcm/Makefile b/drivers/pinctrl/bcm/Makefile
>> index 7ba80a3..bb6beb6 100644
>> --- a/drivers/pinctrl/bcm/Makefile
>> +++ b/drivers/pinctrl/bcm/Makefile
>> @@ -1,4 +1,5 @@
>>  # Broadcom pinctrl support
>>  
>> -obj-$(CONFIG_PINCTRL_BCM281XX)	+= pinctrl-bcm281xx.o
>> -obj-$(CONFIG_PINCTRL_BCM2835)	+= pinctrl-bcm2835.o
>> +obj-$(CONFIG_PINCTRL_BCM281XX)		+= pinctrl-bcm281xx.o
>> +obj-$(CONFIG_PINCTRL_BCM2835)		+= pinctrl-bcm2835.o
>> +obj-$(CONFIG_PINCTRL_CYGNUS_MUX)	+= pinctrl-cygnus-mux.o
>> diff --git a/drivers/pinctrl/bcm/pinctrl-cygnus-mux.c b/drivers/pinctrl/bcm/pinctrl-cygnus-mux.c
>> new file mode 100644
>> index 0000000..33565b4
>> --- /dev/null
>> +++ b/drivers/pinctrl/bcm/pinctrl-cygnus-mux.c
>> @@ -0,0 +1,1087 @@
>> +/* Copyright (C) 2014-2015 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + *
>> + * This file contains the Cygnus IOMUX driver that supports group based PINMUX
>> + * configuration. Although PINMUX configuration is mainly group based, the
>> + * Cygnus IOMUX controller allows certain pins to be individually muxed to GPIO
>> + * function, and therefore be controlled by the Cygnus ASIU GPIO controller
>> + */
>> +
>> +#include <linux/err.h>
>> +#include <linux/io.h>
>> +#include <linux/module.h>
>> +#include <linux/of.h>
>> +#include <linux/slab.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/pinctrl/pinctrl.h>
>> +#include <linux/pinctrl/pinmux.h>
>> +#include <linux/pinctrl/pinconf.h>
>> +#include <linux/pinctrl/pinconf-generic.h>
>> +#include "../core.h"
>> +#include "../pinctrl-utils.h"
>> +
>> +#define CYGNUS_NUM_IOMUX_REGS     8
>> +#define CYGNUS_NUM_MUX_PER_REG    8
>> +#define CYGNUS_NUM_IOMUX          (CYGNUS_NUM_IOMUX_REGS * \
>> +				   CYGNUS_NUM_MUX_PER_REG)
>> +
>> +/*
>> + * Cygnus IOMUX register description
>> + *
>> + * @offset: register offset for mux configuration of a group
>> + * @shift: bit shift for mux configuration of a group
>> + * @alt: alternate function to set to
>> + */
>> +struct cygnus_mux {
>> +	unsigned int offset;
>> +	unsigned int shift;
>> +	unsigned int alt;
>> +};
>> +
>> +/*
>> + * Keep track of Cygnus IOMUX configuration and prevent double configuration
>> + *
>> + * @cygnus_mux: Cygnus IOMUX register description
>> + * @is_configured: flag to indicate whether a mux setting has already been
>> + * configured
>> + */
>> +struct cygnus_mux_log {
>> +	struct cygnus_mux mux;
>> +	bool is_configured;
>> +};
>> +
>> +/*
>> + * Group based IOMUX configuration
>> + *
>> + * @name: name of the group
>> + * @pins: array of pins used by this group
>> + * @num_pins: total number of pins used by this group
>> + * @mux: Cygnus group based IOMUX configuration
>> + */
>> +struct cygnus_pin_group {
>> +	const char *name;
>> +	const unsigned *pins;
>> +	const unsigned num_pins;
>> +	const struct cygnus_mux mux;
> 
> Not: the last 2 consts are quite weird - if you want to make an instance
> of cygnus_pin_group immutable you declare it as a const (and I see you
> are already doing that below). With the structure as it laid out
> currently you can only do static initializers.
> 
Right. I'll remove the last two const.

>> +};
>> +
>> +/*
>> + * Cygnus mux function and supported pin groups
>> + *
>> + * @name: name of the function
>> + * @groups: array of groups that can be supported by this function
>> + * @num_groups: total number of groups that can be supported by this function
>> + */
>> +struct cygnus_pin_function {
>> +	const char *name;
>> +	const char * const *groups;
>> +	const unsigned num_groups;
> 
> Here as well.
> 
> ...
> 
Yes. Will remove the last const.

>> +
>> +/*
>> + * List of pins in Cygnus
>> + */
>> +static struct cygnus_pin cygnus_pins[] = {
> 
> const?
> 
I cannot make it const here, since the address of "gpio_mux" is later
passed to pinctrl_pin_desc's private data:

pins[i].drv_data = &cygnus_pins[i].gpio_mux;

>> +	CYGNUS_PIN_DESC(0, "ext_device_reset_n", 0, 0, 0),
>> +	CYGNUS_PIN_DESC(1, "chip_mode0", 0, 0, 0),
> 
> ...
> 
>> +#define CYGNUS_PIN_GROUP(group_name, off, sh, al)	\
>> +{							\
>> +	.name = #group_name"""_grp",			\
> 
> Why do we need extra pair of quotes? BTW we can also do
> 
> 	.name = __stringify(group_name) "_grp",
> 
Okay. I will change to use __stringify. Thanks.

>> +	.pins = group_name ## _pins,			\
>> +	.num_pins = ARRAY_SIZE(group_name ## _pins),	\
>> +	.mux = {					\
>> +		.offset = off,				\
>> +		.shift = sh,				\
>> +		.alt = al,				\
>> +	}						\
>> +}
> 
> ...
> 
>> +
>> +static struct pinctrl_ops cygnus_pinctrl_ops = {
> 
> const?
> 
Yes.

>> +	.get_groups_count = cygnus_get_groups_count,
>> +	.get_group_name = cygnus_get_group_name,
>> +	.get_group_pins = cygnus_get_group_pins,
>> +	.pin_dbg_show = cygnus_pin_dbg_show,
>> +	.dt_node_to_map = cygnus_dt_node_to_map,
>> +	.dt_free_map = pinctrl_utils_dt_free_map,
>> +};
>> +
>> +static int cygnus_get_functions_count(struct pinctrl_dev *pctrl_dev)
>> +{
>> +	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
>> +
>> +	return pinctrl->num_functions;
>> +}
>> +
>> +static const char *cygnus_get_function_name(struct pinctrl_dev *pctrl_dev,
>> +					    unsigned selector)
>> +{
>> +	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
>> +
>> +	return pinctrl->functions[selector].name;
>> +}
>> +
>> +static int cygnus_get_function_groups(struct pinctrl_dev *pctrl_dev,
>> +				      unsigned selector,
>> +				      const char * const **groups,
>> +				      unsigned * const num_groups)
>> +{
>> +	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
>> +
>> +	*groups = pinctrl->functions[selector].groups;
>> +	*num_groups = pinctrl->functions[selector].num_groups;
>> +
>> +	return 0;
>> +}
>> +
>> +static int cygnus_pinmux_set(struct cygnus_pinctrl *pinctrl,
>> +			     const struct cygnus_pin_function *func,
>> +			     const struct cygnus_pin_group *grp,
>> +			     struct cygnus_mux_log *mux_log)
>> +{
>> +	const struct cygnus_mux *mux = &grp->mux;
>> +	int i;
>> +	u32 val, mask = 0x7;
>> +	unsigned long flags;
>> +
>> +	for (i = 0; i < CYGNUS_NUM_IOMUX; i++) {
>> +		if (mux->offset != mux_log[i].mux.offset ||
>> +		    mux->shift != mux_log[i].mux.shift)
>> +			continue;
>> +
>> +		/* match found if we reach here */
>> +
>> +		/* if this is a new configuration, just do it! */
>> +		if (!mux_log[i].is_configured)
>> +			break;
>> +
>> +		/*
>> +		 * IOMUX has been configured previously and one is trying to
>> +		 * configure it to a different function
>> +		 */
>> +		if (mux_log[i].mux.alt != mux->alt) {
>> +			dev_err(pinctrl->dev,
>> +				"double configuration error detected!\n");
>> +			dev_err(pinctrl->dev, "func:%s grp:%s\n",
>> +				func->name, grp->name);
>> +			return -EINVAL;
>> +		} else {
>> +			/*
>> +			 * One tries to configure it to the same function.
>> +			 * Just quit and don't bother
>> +			 */
>> +			return 0;
>> +		}
>> +	}
>> +
>> +	mux_log[i].mux.alt = mux->alt;
>> +	mux_log[i].is_configured = true;
>> +
>> +	spin_lock_irqsave(&pinctrl->lock, flags);
>> +
>> +	val = readl(pinctrl->base0 + grp->mux.offset);
>> +	val &= ~(mask << grp->mux.shift);
>> +	val |= grp->mux.alt << grp->mux.shift;
>> +	writel(val, pinctrl->base0 + grp->mux.offset);
>> +
>> +	spin_unlock_irqrestore(&pinctrl->lock, flags);
>> +
>> +	return 0;
>> +}
>> +
>> +static int cygnus_pinmux_set_mux(struct pinctrl_dev *pctrl_dev,
>> +				 unsigned func_select, unsigned grp_select)
>> +{
>> +	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
>> +	const struct cygnus_pin_function *func =
>> +		&pinctrl->functions[func_select];
>> +	const struct cygnus_pin_group *grp = &pinctrl->groups[grp_select];
>> +
>> +	dev_dbg(pctrl_dev->dev, "func:%u name:%s grp:%u name:%s\n",
>> +		func_select, func->name, grp_select, grp->name);
>> +
>> +	dev_dbg(pctrl_dev->dev, "offset:0x%08x shift:%u alt:%u\n",
>> +		grp->mux.offset, grp->mux.shift, grp->mux.alt);
>> +
>> +	return cygnus_pinmux_set(pinctrl, func, grp, pinctrl->mux_log);
>> +}
>> +
>> +static int cygnus_gpio_request_enable(struct pinctrl_dev *pctrl_dev,
>> +				      struct pinctrl_gpio_range *range,
>> +				      unsigned pin)
>> +{
>> +	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
>> +	struct cygnus_gpio_mux *mux = pctrl_dev->desc->pins[pin].drv_data;
> 
> const?
> 
Yes.

>> +	u32 val;
>> +	unsigned long flags;
>> +
>> +	/* not all pins support GPIO pinmux override */
>> +	if (!mux->is_supported)
>> +		return -ENOTSUPP;
>> +
>> +	spin_lock_irqsave(&pinctrl->lock, flags);
>> +
>> +	val = readl(pinctrl->base1 + mux->offset);
>> +	val |= 0x3 << mux->shift;
>> +	writel(val, pinctrl->base1 + mux->offset);
>> +
>> +	spin_unlock_irqrestore(&pinctrl->lock, flags);
>> +
>> +	dev_dbg(pctrl_dev->dev,
>> +		"gpio request enable pin=%u offset=0x%x shift=%u\n",
>> +		pin, mux->offset, mux->shift);
>> +
>> +	return 0;
>> +}
>> +
>> +static void cygnus_gpio_disable_free(struct pinctrl_dev *pctrl_dev,
>> +				     struct pinctrl_gpio_range *range,
>> +				     unsigned pin)
>> +{
>> +	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
>> +	struct cygnus_gpio_mux *mux = pctrl_dev->desc->pins[pin].drv_data;
>> +	u32 val;
>> +	unsigned long flags;
>> +
>> +	if (!mux->is_supported)
>> +		return;
>> +
>> +	spin_lock_irqsave(&pinctrl->lock, flags);
>> +
>> +	val = readl(pinctrl->base1 + mux->offset);
>> +	val &= ~(0x3 << mux->shift);
>> +	writel(val, pinctrl->base1 + mux->offset);
>> +
>> +	spin_unlock_irqrestore(&pinctrl->lock, flags);
>> +
>> +	dev_err(pctrl_dev->dev,
>> +		"gpio disable free pin=%u offset=0x%x shift=%u\n",
>> +		pin, mux->offset, mux->shift);
>> +}
>> +
>> +static struct pinmux_ops cygnus_pinmux_ops = {
> 
> const?
> 
Yes.

>> +	.get_functions_count = cygnus_get_functions_count,
>> +	.get_function_name = cygnus_get_function_name,
>> +	.get_function_groups = cygnus_get_function_groups,
>> +	.set_mux = cygnus_pinmux_set_mux,
>> +	.gpio_request_enable = cygnus_gpio_request_enable,
>> +	.gpio_disable_free = cygnus_gpio_disable_free,
>> +};
>> +
>> +static struct pinctrl_desc cygnus_pinctrl_desc = {
>> +	.name = "cygnus-pinmux",
>> +	.pctlops = &cygnus_pinctrl_ops,
>> +	.pmxops = &cygnus_pinmux_ops,
>> +};
>> +
>> +static int cygnus_mux_log_init(struct cygnus_pinctrl *pinctrl)
>> +{
>> +	struct cygnus_mux_log *log;
>> +	unsigned int i, j;
>> +
>> +	pinctrl->mux_log = devm_kcalloc(pinctrl->dev, CYGNUS_NUM_IOMUX,
>> +					sizeof(struct cygnus_mux_log),
>> +					GFP_KERNEL);
>> +	if (!pinctrl->mux_log)
>> +		return -ENOMEM;
>> +
>> +	log = pinctrl->mux_log;
>> +	for (i = 0; i < CYGNUS_NUM_IOMUX_REGS; i++) {
>> +		for (j = 0; j < CYGNUS_NUM_MUX_PER_REG; j++) {
>> +			log = &pinctrl->mux_log[i * CYGNUS_NUM_MUX_PER_REG
>> +				+ j];
>> +			log->mux.offset = i * 4;
>> +			log->mux.shift = j * 4;
>> +			log->mux.alt = 0;
>> +			log->is_configured = false;
>> +		}
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static int cygnus_pinmux_probe(struct platform_device *pdev)
>> +{
>> +	struct cygnus_pinctrl *pinctrl;
>> +	struct resource *res;
>> +	int i, ret;
>> +	struct pinctrl_pin_desc *pins;
>> +	unsigned num_pins = ARRAY_SIZE(cygnus_pins);
>> +
>> +	pinctrl = devm_kzalloc(&pdev->dev, sizeof(*pinctrl), GFP_KERNEL);
>> +	if (!pinctrl)
>> +		return -ENOMEM;
>> +
>> +	pinctrl->dev = &pdev->dev;
>> +	platform_set_drvdata(pdev, pinctrl);
>> +	spin_lock_init(&pinctrl->lock);
>> +
>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +	pinctrl->base0 = devm_ioremap_resource(&pdev->dev, res);
>> +	if (IS_ERR(pinctrl->base0)) {
>> +		dev_err(&pdev->dev, "unable to map I/O space\n");
>> +		return PTR_ERR(pinctrl->base0);
>> +	}
>> +
>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
>> +	pinctrl->base1 = devm_ioremap_resource(&pdev->dev, res);
>> +	if (IS_ERR(pinctrl->base1)) {
>> +		dev_err(&pdev->dev, "unable to map I/O space\n");
>> +		return PTR_ERR(pinctrl->base1);
>> +	}
>> +
>> +	ret = cygnus_mux_log_init(pinctrl);
>> +	if (ret) {
>> +		dev_err(&pdev->dev, "unable to initialize IOMUX log\n");
>> +		return ret;
>> +	}
>> +
>> +	pins = devm_kcalloc(&pdev->dev, num_pins, sizeof(*pins), GFP_KERNEL);
>> +	if (!pins)
>> +		return -ENOMEM;
>> +
>> +	for (i = 0; i < num_pins; i++) {
>> +		pins[i].number = cygnus_pins[i].pin;
>> +		pins[i].name = cygnus_pins[i].name;
>> +		pins[i].drv_data = &cygnus_pins[i].gpio_mux;
>> +	}
>> +
>> +	pinctrl->groups = cygnus_pin_groups;
>> +	pinctrl->num_groups = ARRAY_SIZE(cygnus_pin_groups);
>> +	pinctrl->functions = cygnus_pin_functions;
>> +	pinctrl->num_functions = ARRAY_SIZE(cygnus_pin_functions);
>> +	cygnus_pinctrl_desc.pins = pins;
>> +	cygnus_pinctrl_desc.npins = num_pins;
>> +
>> +	pinctrl->pctl = pinctrl_register(&cygnus_pinctrl_desc, &pdev->dev,
>> +			pinctrl);
>> +	if (!pinctrl->pctl) {
>> +		dev_err(&pdev->dev, "unable to register Cygnus IOMUX pinctrl\n");
>> +		return -EINVAL;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static struct of_device_id cygnus_pinmux_of_match[] = {
>> +	{ .compatible = "brcm,cygnus-pinmux" },
>> +	{ }
>> +};
>> +
>> +static struct platform_driver cygnus_pinmux_driver = {
>> +	.driver = {
>> +		.name = "cygnus-pinmux",
>> +		.of_match_table = cygnus_pinmux_of_match,
>> +	},
>> +	.probe = cygnus_pinmux_probe,
> 
> You also need to either provide remove() method or disallow unbinding
> via sysfs by setting suppress_bind_attrs in platform driver.
> 
I do not expect this driver to ever be compiled as module and
uninstalled at runtime. I'll add .suppress_bind_attrs = true, thanks!
>> +};
>> +
>> +static int __init cygnus_pinmux_init(void)
>> +{
>> +	return platform_driver_register(&cygnus_pinmux_driver);
>> +}
>> +arch_initcall(cygnus_pinmux_init);
>> +
>> +MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
>> +MODULE_DESCRIPTION("Broadcom Cygnus IOMUX driver");
>> +MODULE_LICENSE("GPL v2");
>> -- 
>> 1.7.9.5
>>
> 
> Thanks.
> 
Thanks for the review!

Ray

Re: [PATCH v3 3/4] pinctrl: cygnus: add initial IOMUX driver support

[Dmitry Torokhov]

On Tue, Feb 03, 2015 at 11:29:36AM -0800, Ray Jui wrote:
> On 2/3/2015 9:40 AM, Dmitry Torokhov wrote:
> > On Mon, Feb 02, 2015 at 06:01:33PM -0800, Ray Jui wrote:
> >> +
> >> +/*
> >> + * List of pins in Cygnus
> >> + */
> >> +static struct cygnus_pin cygnus_pins[] = {
> > 
> > const?
> > 
> I cannot make it const here, since the address of "gpio_mux" is later
> passed to pinctrl_pin_desc's private data:
> 
> pins[i].drv_data = &cygnus_pins[i].gpio_mux;

The pinctrl code says:

"@drv_data: driver-defined per-pin data. pinctrl core does not touch
this"

so we could theoretically cast away the constness and restore it when
we access drv_data in pin control methods, but I won't insist. I am
not sure which way looks nicer.

Thanks.

-- 
Dmitry

[PATCH v3 3/4] pinctrl: cygnus: add initial IOMUX driver support

[Dmitry Torokhov]

On Tue, Feb 03, 2015 at 11:29:36AM -0800, Ray Jui wrote:
> On 2/3/2015 9:40 AM, Dmitry Torokhov wrote:
> > On Mon, Feb 02, 2015 at 06:01:33PM -0800, Ray Jui wrote:
> >> +
> >> +/*
> >> + * List of pins in Cygnus
> >> + */
> >> +static struct cygnus_pin cygnus_pins[] = {
> > 
> > const?
> > 
> I cannot make it const here, since the address of "gpio_mux" is later
> passed to pinctrl_pin_desc's private data:
> 
> pins[i].drv_data = &cygnus_pins[i].gpio_mux;

The pinctrl code says:

"@drv_data: driver-defined per-pin data. pinctrl core does not touch
this"

so we could theoretically cast away the constness and restore it when
we access drv_data in pin control methods, but I won't insist. I am
not sure which way looks nicer.

Thanks.

-- 
Dmitry

Re: [PATCH v3 3/4] pinctrl: cygnus: add initial IOMUX driver support

[Ray Jui]

On 2/3/2015 12:00 PM, Dmitry Torokhov wrote:
> On Tue, Feb 03, 2015 at 11:29:36AM -0800, Ray Jui wrote:
>> On 2/3/2015 9:40 AM, Dmitry Torokhov wrote:
>>> On Mon, Feb 02, 2015 at 06:01:33PM -0800, Ray Jui wrote:
>>>> +
>>>> +/*
>>>> + * List of pins in Cygnus
>>>> + */
>>>> +static struct cygnus_pin cygnus_pins[] = {
>>>
>>> const?
>>>
>> I cannot make it const here, since the address of "gpio_mux" is later
>> passed to pinctrl_pin_desc's private data:
>>
>> pins[i].drv_data = &cygnus_pins[i].gpio_mux;
> 
> The pinctrl code says:
> 
> "@drv_data: driver-defined per-pin data. pinctrl core does not touch
> this"
> 
> so we could theoretically cast away the constness and restore it when
> we access drv_data in pin control methods, but I won't insist. I am
> not sure which way looks nicer.
> 
> Thanks.
> 
Yeah, I agreed that by declaring the cygnus_pins array const, it makes
it more obvious that "we do not expect any of its parameters to change."
But later if we cast &gpio_mux to void * before assigned to drv_data of
pinctrl_pin_desc, we sort of break it up...I'll keep this part of code
as it is for now.

Thanks,

Ray

Re: [PATCH v3 3/4] pinctrl: cygnus: add initial IOMUX driver support

[Ray Jui]

On 2/3/2015 12:00 PM, Dmitry Torokhov wrote:
> On Tue, Feb 03, 2015 at 11:29:36AM -0800, Ray Jui wrote:
>> On 2/3/2015 9:40 AM, Dmitry Torokhov wrote:
>>> On Mon, Feb 02, 2015 at 06:01:33PM -0800, Ray Jui wrote:
>>>> +
>>>> +/*
>>>> + * List of pins in Cygnus
>>>> + */
>>>> +static struct cygnus_pin cygnus_pins[] = {
>>>
>>> const?
>>>
>> I cannot make it const here, since the address of "gpio_mux" is later
>> passed to pinctrl_pin_desc's private data:
>>
>> pins[i].drv_data = &cygnus_pins[i].gpio_mux;
> 
> The pinctrl code says:
> 
> "@drv_data: driver-defined per-pin data. pinctrl core does not touch
> this"
> 
> so we could theoretically cast away the constness and restore it when
> we access drv_data in pin control methods, but I won't insist. I am
> not sure which way looks nicer.
> 
> Thanks.
> 
Yeah, I agreed that by declaring the cygnus_pins array const, it makes
it more obvious that "we do not expect any of its parameters to change."
But later if we cast &gpio_mux to void * before assigned to drv_data of
pinctrl_pin_desc, we sort of break it up...I'll keep this part of code
as it is for now.

Thanks,

Ray

[PATCH v3 3/4] pinctrl: cygnus: add initial IOMUX driver support

[Ray Jui]

On 2/3/2015 12:00 PM, Dmitry Torokhov wrote:
> On Tue, Feb 03, 2015 at 11:29:36AM -0800, Ray Jui wrote:
>> On 2/3/2015 9:40 AM, Dmitry Torokhov wrote:
>>> On Mon, Feb 02, 2015 at 06:01:33PM -0800, Ray Jui wrote:
>>>> +
>>>> +/*
>>>> + * List of pins in Cygnus
>>>> + */
>>>> +static struct cygnus_pin cygnus_pins[] = {
>>>
>>> const?
>>>
>> I cannot make it const here, since the address of "gpio_mux" is later
>> passed to pinctrl_pin_desc's private data:
>>
>> pins[i].drv_data = &cygnus_pins[i].gpio_mux;
> 
> The pinctrl code says:
> 
> "@drv_data: driver-defined per-pin data. pinctrl core does not touch
> this"
> 
> so we could theoretically cast away the constness and restore it when
> we access drv_data in pin control methods, but I won't insist. I am
> not sure which way looks nicer.
> 
> Thanks.
> 
Yeah, I agreed that by declaring the cygnus_pins array const, it makes
it more obvious that "we do not expect any of its parameters to change."
But later if we cast &gpio_mux to void * before assigned to drv_data of
pinctrl_pin_desc, we sort of break it up...I'll keep this part of code
as it is for now.

Thanks,

Ray

[PATCH v7 0/4] Add gpio/pinconf support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial GPIO/PINCONF support for the Broadcom
Cygnus SoC.

Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
the this driver.

All 3 Cygnus GPIO controllers support basic PINCONF functions such as bias
pull up, pull down, and drive strength configurations, when these pins are
muxed to GPIO.

Pins from the ASIU GPIO can be individually muxed to GPIO function, through
interaction with the Cygnus IOMUX controller.

Note this patchset has a dependency on the other patchset "Add pinctrl support
to Broadcom Cygnus SoC" that is also under review

Changes from v6:
 - Move the driver from drivers/gpio/* to drivers/pinctrl/* since this driver
   supports both GPIO and some basic PINCONF features
 - Support PINCONF features through standard DT subnodes properties including
   "bias-disable", "bias-pull-up", "bias-pull-down", and "drive-strength", by
   creating local PINCONF controller
 - Add support to allow individual ASIU GPIO pins to be muxed as GPIO, through
   interactions with the Cygnus IOMUX driver
 - Convert the driver to use standard GPIOCHIP_IRQ APIs. This helps to reduce
   customized code in the driver
 - Other miscellaneous imrpovements in the driver
 - Enable GPIO based phone hook detection support for BCM911360 phone factor
   board

Changes from v5:
 - Get rid of DT property "linux,gpio-base". Use dynamic allocation for GPIO base
   number

Changes from v4:
 - Use DT property "linux,gpio-base" to define GPIO base number
 - factorize common code to improve code readability and reduce code size
 - remove "bcm_" prefix on function and struct names
 - improve debugging prints
 - default GPIO_BCM_CYGNUS to y in Kconfig (it still depends on
   ARCH_BCM_CYGNUS). This way we do not need to select it from the
   arch/arm/mach-bcm/Kconfig
 - Get rid of redundant MAINTAINER entry for this driver. It will be maintained
   by Broadcom iProc/Cygnus maintainers
 - Update device tree document based on driver changes

Changes from v3:
 - Fix dt property tpyo
 - Fix incorrect GPIO compatible ID in device tree binding document example

Changes from v2:
 - Consolidate different compatible IDs into "brcm,cygnus-gpio"
 - Get rid of redundant "no-interrupt" property

Changes from v1:
 - Get rid of inline qualifier
 - Get rid of redundant check in the ISR
 - Other minor fixes to imrove code readability

Ray Jui (4):
  pinctrl: Cygnus: define Broadcom Cygnus GPIO/PINCONF binding
  pinctrl: cygnus: add gpio/pinconf driver
  ARM: dts: enable GPIO for Broadcom Cygnus
  ARM: dts: cygnus: enable GPIO based hook detection

 .../bindings/pinctrl/brcm,cygnus-gpio.txt          |  102 +++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   33 +
 arch/arm/boot/dts/bcm911360_entphn.dts             |   13 +
 drivers/pinctrl/bcm/Kconfig                        |   22 +
 drivers/pinctrl/bcm/Makefile                       |    1 +
 drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c          |  920 ++++++++++++++++++++
 6 files changed, 1091 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt
 create mode 100644 drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c

-- 
1.7.9.5

[PATCH v7 0/4] Add gpio/pinconf support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial GPIO/PINCONF support for the Broadcom
Cygnus SoC.

Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
the this driver.

All 3 Cygnus GPIO controllers support basic PINCONF functions such as bias
pull up, pull down, and drive strength configurations, when these pins are
muxed to GPIO.

Pins from the ASIU GPIO can be individually muxed to GPIO function, through
interaction with the Cygnus IOMUX controller.

Note this patchset has a dependency on the other patchset "Add pinctrl support
to Broadcom Cygnus SoC" that is also under review

Changes from v6:
 - Move the driver from drivers/gpio/* to drivers/pinctrl/* since this driver
   supports both GPIO and some basic PINCONF features
 - Support PINCONF features through standard DT subnodes properties including
   "bias-disable", "bias-pull-up", "bias-pull-down", and "drive-strength", by
   creating local PINCONF controller
 - Add support to allow individual ASIU GPIO pins to be muxed as GPIO, through
   interactions with the Cygnus IOMUX driver
 - Convert the driver to use standard GPIOCHIP_IRQ APIs. This helps to reduce
   customized code in the driver
 - Other miscellaneous imrpovements in the driver
 - Enable GPIO based phone hook detection support for BCM911360 phone factor
   board

Changes from v5:
 - Get rid of DT property "linux,gpio-base". Use dynamic allocation for GPIO base
   number

Changes from v4:
 - Use DT property "linux,gpio-base" to define GPIO base number
 - factorize common code to improve code readability and reduce code size
 - remove "bcm_" prefix on function and struct names
 - improve debugging prints
 - default GPIO_BCM_CYGNUS to y in Kconfig (it still depends on
   ARCH_BCM_CYGNUS). This way we do not need to select it from the
   arch/arm/mach-bcm/Kconfig
 - Get rid of redundant MAINTAINER entry for this driver. It will be maintained
   by Broadcom iProc/Cygnus maintainers
 - Update device tree document based on driver changes

Changes from v3:
 - Fix dt property tpyo
 - Fix incorrect GPIO compatible ID in device tree binding document example

Changes from v2:
 - Consolidate different compatible IDs into "brcm,cygnus-gpio"
 - Get rid of redundant "no-interrupt" property

Changes from v1:
 - Get rid of inline qualifier
 - Get rid of redundant check in the ISR
 - Other minor fixes to imrove code readability

Ray Jui (4):
  pinctrl: Cygnus: define Broadcom Cygnus GPIO/PINCONF binding
  pinctrl: cygnus: add gpio/pinconf driver
  ARM: dts: enable GPIO for Broadcom Cygnus
  ARM: dts: cygnus: enable GPIO based hook detection

 .../bindings/pinctrl/brcm,cygnus-gpio.txt          |  102 +++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   33 +
 arch/arm/boot/dts/bcm911360_entphn.dts             |   13 +
 drivers/pinctrl/bcm/Kconfig                        |   22 +
 drivers/pinctrl/bcm/Makefile                       |    1 +
 drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c          |  920 ++++++++++++++++++++
 6 files changed, 1091 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt
 create mode 100644 drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c

-- 
1.7.9.5

[PATCH v7 0/4] Add gpio/pinconf support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial GPIO/PINCONF support for the Broadcom
Cygnus SoC.

Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
the this driver.

All 3 Cygnus GPIO controllers support basic PINCONF functions such as bias
pull up, pull down, and drive strength configurations, when these pins are
muxed to GPIO.

Pins from the ASIU GPIO can be individually muxed to GPIO function, through
interaction with the Cygnus IOMUX controller.

Note this patchset has a dependency on the other patchset "Add pinctrl support
to Broadcom Cygnus SoC" that is also under review

Changes from v6:
 - Move the driver from drivers/gpio/* to drivers/pinctrl/* since this driver
   supports both GPIO and some basic PINCONF features
 - Support PINCONF features through standard DT subnodes properties including
   "bias-disable", "bias-pull-up", "bias-pull-down", and "drive-strength", by
   creating local PINCONF controller
 - Add support to allow individual ASIU GPIO pins to be muxed as GPIO, through
   interactions with the Cygnus IOMUX driver
 - Convert the driver to use standard GPIOCHIP_IRQ APIs. This helps to reduce
   customized code in the driver
 - Other miscellaneous imrpovements in the driver
 - Enable GPIO based phone hook detection support for BCM911360 phone factor
   board

Changes from v5:
 - Get rid of DT property "linux,gpio-base". Use dynamic allocation for GPIO base
   number

Changes from v4:
 - Use DT property "linux,gpio-base" to define GPIO base number
 - factorize common code to improve code readability and reduce code size
 - remove "bcm_" prefix on function and struct names
 - improve debugging prints
 - default GPIO_BCM_CYGNUS to y in Kconfig (it still depends on
   ARCH_BCM_CYGNUS). This way we do not need to select it from the
   arch/arm/mach-bcm/Kconfig
 - Get rid of redundant MAINTAINER entry for this driver. It will be maintained
   by Broadcom iProc/Cygnus maintainers
 - Update device tree document based on driver changes

Changes from v3:
 - Fix dt property tpyo
 - Fix incorrect GPIO compatible ID in device tree binding document example

Changes from v2:
 - Consolidate different compatible IDs into "brcm,cygnus-gpio"
 - Get rid of redundant "no-interrupt" property

Changes from v1:
 - Get rid of inline qualifier
 - Get rid of redundant check in the ISR
 - Other minor fixes to imrove code readability

Ray Jui (4):
  pinctrl: Cygnus: define Broadcom Cygnus GPIO/PINCONF binding
  pinctrl: cygnus: add gpio/pinconf driver
  ARM: dts: enable GPIO for Broadcom Cygnus
  ARM: dts: cygnus: enable GPIO based hook detection

 .../bindings/pinctrl/brcm,cygnus-gpio.txt          |  102 +++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   33 +
 arch/arm/boot/dts/bcm911360_entphn.dts             |   13 +
 drivers/pinctrl/bcm/Kconfig                        |   22 +
 drivers/pinctrl/bcm/Makefile                       |    1 +
 drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c          |  920 ++++++++++++++++++++
 6 files changed, 1091 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt
 create mode 100644 drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c

-- 
1.7.9.5

[PATCH v7 1/4] pinctrl: Cygnus: define Broadcom Cygnus GPIO/PINCONF binding

[Ray Jui]

Document the GPIO/PINCONF device tree binding for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
---
 .../bindings/pinctrl/brcm,cygnus-gpio.txt          |  102 ++++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt

diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt
new file mode 100644
index 0000000..9b9196c
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt
@@ -0,0 +1,102 @@
+Broadcom Cygnus GPIO/PINCONF Controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,cygnus-gpio"
+
+- reg:
+    Define the base and range of the I/O address space that contains the Cygnus
+GPIO/PINCONF controller registers
+
+- ngpios:
+    Total number of GPIOs the controller provides
+
+- #gpio-cells:
+    Must be two. The first cell is the GPIO pin number (within the
+controller's pin space) and the second cell is used for the following:
+    bit[0]: polarity (0 for active high and 1 for active low)
+
+- gpio-controller:
+    Specifies that the node is a GPIO controller
+
+Optional properties:
+
+- interrupts:
+    Interrupt ID
+
+- interrupt-controller:
+    Specifies that the node is an interrupt controller
+
+- pinmux:
+    Specifies the phandle to the IOMUX device, where pins can be individually
+muxed to GPIO
+
+Supported generic PINCONF properties in child nodes:
+
+- pins:
+    The list of pins (within the controller's own pin space) that properties
+in the node apply to. Pin names are "gpio-<pin>"
+
+- bias-disable:
+    Disable pin bias
+
+- bias-pull-up:
+    Enable internal pull up resistor
+
+- bias-pull-down:
+    Enable internal pull down resistor
+
+- drive-strength:
+    Valid drive strength values include 2, 4, 6, 8, 10, 12, 14, 16 (mA)
+
+Example:
+	gpio_ccm: gpio@1800a000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x1800a000 0x50>,
+		      <0x0301d164 0x20>;
+		ngpios = <24>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+
+		touch_pins: touch_pins {
+			pwr: pwr {
+				pins = "gpio-0";
+				drive-strength = <16>;
+			};
+
+			event: event {
+				pins = "gpio-1";
+				bias-pull-up;
+			};
+		};
+	};
+
+	gpio_asiu: gpio@180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <146>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+	};
+
+	/*
+	 * Touchscreen that uses the CCM GPIO 0 and 1
+	 */
+	tsc {
+		...
+		...
+		gpio-pwr = <&gpio_ccm 0 0>;
+		gpio-event = <&gpio_ccm 1 0>;
+	};
+
+	/* Bluetooth that uses the ASIU GPIO 5, with polarity inverted */
+	bluetooth {
+		...
+		...
+		bcm,rfkill-bank-sel = <&gpio_asiu 5 1>
+	}
-- 
1.7.9.5

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[PATCH v7 1/4] pinctrl: Cygnus: define Broadcom Cygnus GPIO/PINCONF binding

[Ray Jui]

Document the GPIO/PINCONF device tree binding for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../bindings/pinctrl/brcm,cygnus-gpio.txt          |  102 ++++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt

diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt
new file mode 100644
index 0000000..9b9196c
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt
@@ -0,0 +1,102 @@
+Broadcom Cygnus GPIO/PINCONF Controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,cygnus-gpio"
+
+- reg:
+    Define the base and range of the I/O address space that contains the Cygnus
+GPIO/PINCONF controller registers
+
+- ngpios:
+    Total number of GPIOs the controller provides
+
+- #gpio-cells:
+    Must be two. The first cell is the GPIO pin number (within the
+controller's pin space) and the second cell is used for the following:
+    bit[0]: polarity (0 for active high and 1 for active low)
+
+- gpio-controller:
+    Specifies that the node is a GPIO controller
+
+Optional properties:
+
+- interrupts:
+    Interrupt ID
+
+- interrupt-controller:
+    Specifies that the node is an interrupt controller
+
+- pinmux:
+    Specifies the phandle to the IOMUX device, where pins can be individually
+muxed to GPIO
+
+Supported generic PINCONF properties in child nodes:
+
+- pins:
+    The list of pins (within the controller's own pin space) that properties
+in the node apply to. Pin names are "gpio-<pin>"
+
+- bias-disable:
+    Disable pin bias
+
+- bias-pull-up:
+    Enable internal pull up resistor
+
+- bias-pull-down:
+    Enable internal pull down resistor
+
+- drive-strength:
+    Valid drive strength values include 2, 4, 6, 8, 10, 12, 14, 16 (mA)
+
+Example:
+	gpio_ccm: gpio@1800a000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x1800a000 0x50>,
+		      <0x0301d164 0x20>;
+		ngpios = <24>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+
+		touch_pins: touch_pins {
+			pwr: pwr {
+				pins = "gpio-0";
+				drive-strength = <16>;
+			};
+
+			event: event {
+				pins = "gpio-1";
+				bias-pull-up;
+			};
+		};
+	};
+
+	gpio_asiu: gpio@180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <146>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+	};
+
+	/*
+	 * Touchscreen that uses the CCM GPIO 0 and 1
+	 */
+	tsc {
+		...
+		...
+		gpio-pwr = <&gpio_ccm 0 0>;
+		gpio-event = <&gpio_ccm 1 0>;
+	};
+
+	/* Bluetooth that uses the ASIU GPIO 5, with polarity inverted */
+	bluetooth {
+		...
+		...
+		bcm,rfkill-bank-sel = <&gpio_asiu 5 1>
+	}
-- 
1.7.9.5

[PATCH v7 1/4] pinctrl: Cygnus: define Broadcom Cygnus GPIO/PINCONF binding

[Ray Jui]

Document the GPIO/PINCONF device tree binding for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../bindings/pinctrl/brcm,cygnus-gpio.txt          |  102 ++++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt

diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt
new file mode 100644
index 0000000..9b9196c
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt
@@ -0,0 +1,102 @@
+Broadcom Cygnus GPIO/PINCONF Controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,cygnus-gpio"
+
+- reg:
+    Define the base and range of the I/O address space that contains the Cygnus
+GPIO/PINCONF controller registers
+
+- ngpios:
+    Total number of GPIOs the controller provides
+
+- #gpio-cells:
+    Must be two. The first cell is the GPIO pin number (within the
+controller's pin space) and the second cell is used for the following:
+    bit[0]: polarity (0 for active high and 1 for active low)
+
+- gpio-controller:
+    Specifies that the node is a GPIO controller
+
+Optional properties:
+
+- interrupts:
+    Interrupt ID
+
+- interrupt-controller:
+    Specifies that the node is an interrupt controller
+
+- pinmux:
+    Specifies the phandle to the IOMUX device, where pins can be individually
+muxed to GPIO
+
+Supported generic PINCONF properties in child nodes:
+
+- pins:
+    The list of pins (within the controller's own pin space) that properties
+in the node apply to. Pin names are "gpio-<pin>"
+
+- bias-disable:
+    Disable pin bias
+
+- bias-pull-up:
+    Enable internal pull up resistor
+
+- bias-pull-down:
+    Enable internal pull down resistor
+
+- drive-strength:
+    Valid drive strength values include 2, 4, 6, 8, 10, 12, 14, 16 (mA)
+
+Example:
+	gpio_ccm: gpio at 1800a000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x1800a000 0x50>,
+		      <0x0301d164 0x20>;
+		ngpios = <24>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+
+		touch_pins: touch_pins {
+			pwr: pwr {
+				pins = "gpio-0";
+				drive-strength = <16>;
+			};
+
+			event: event {
+				pins = "gpio-1";
+				bias-pull-up;
+			};
+		};
+	};
+
+	gpio_asiu: gpio at 180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <146>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+	};
+
+	/*
+	 * Touchscreen that uses the CCM GPIO 0 and 1
+	 */
+	tsc {
+		...
+		...
+		gpio-pwr = <&gpio_ccm 0 0>;
+		gpio-event = <&gpio_ccm 1 0>;
+	};
+
+	/* Bluetooth that uses the ASIU GPIO 5, with polarity inverted */
+	bluetooth {
+		...
+		...
+		bcm,rfkill-bank-sel = <&gpio_asiu 5 1>
+	}
-- 
1.7.9.5

[PATCH v7 2/4] pinctrl: cygnus: add gpio/pinconf driver

[Ray Jui]

This adds the initial support of the Broadcom Cygnus GPIO/PINCONF driver
that supports all 3 GPIO controllers on Cygnus including the ASIU GPIO
controller, the chipCommonG GPIO controller, and the always-on GPIO
controller. Basic PINCONF configurations such as bias pull up/down, and
drive strength are also supported in this driver.

Pins from the ASIU GPIO controller can be individually muxed to GPIO
function, through interaction with the Cygnus IOMUX controller

Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
---
 drivers/pinctrl/bcm/Kconfig               |   22 +
 drivers/pinctrl/bcm/Makefile              |    1 +
 drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c |  920 +++++++++++++++++++++++++++++
 3 files changed, 943 insertions(+)
 create mode 100644 drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c

diff --git a/drivers/pinctrl/bcm/Kconfig b/drivers/pinctrl/bcm/Kconfig
index eb13201..cd11d4d 100644
--- a/drivers/pinctrl/bcm/Kconfig
+++ b/drivers/pinctrl/bcm/Kconfig
@@ -20,6 +20,28 @@ config PINCTRL_BCM2835
 	select PINMUX
 	select PINCONF
 
+config PINCTRL_CYGNUS_GPIO
+	bool "Broadcom Cygnus GPIO (with PINCONF) driver"
+	depends on OF_GPIO && ARCH_BCM_CYGNUS
+	select GPIOLIB_IRQCHIP
+	select PINCONF
+	select GENERIC_PINCONF
+	default ARCH_BCM_CYGNUS
+	help
+	  Say yes here to enable the Broadcom Cygnus GPIO driver.
+
+	  The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
+	  GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
+	  the always-ON GPIO controller (CRMU/AON). All 3 GPIO controllers are
+	  supported by this driver.
+
+	  All 3 Cygnus GPIO controllers support basic PINCONF functions such
+	  as bias pull up, pull down, and drive strength configurations, when
+	  these pins are muxed to GPIO.
+
+	  Pins from the ASIU GPIO can be individually muxed to GPIO function,
+	  through interaction with the Cygnus IOMUX controller.
+
 config PINCTRL_CYGNUS_MUX
 	bool "Broadcom Cygnus IOMUX driver"
 	depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
diff --git a/drivers/pinctrl/bcm/Makefile b/drivers/pinctrl/bcm/Makefile
index bb6beb6..2b2f70e 100644
--- a/drivers/pinctrl/bcm/Makefile
+++ b/drivers/pinctrl/bcm/Makefile
@@ -2,4 +2,5 @@
 
 obj-$(CONFIG_PINCTRL_BCM281XX)		+= pinctrl-bcm281xx.o
 obj-$(CONFIG_PINCTRL_BCM2835)		+= pinctrl-bcm2835.o
+obj-$(CONFIG_PINCTRL_CYGNUS_GPIO)	+= pinctrl-cygnus-gpio.o
 obj-$(CONFIG_PINCTRL_CYGNUS_MUX)	+= pinctrl-cygnus-mux.o
diff --git a/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c b/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c
new file mode 100644
index 0000000..cfe4478
--- /dev/null
+++ b/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c
@@ -0,0 +1,920 @@
+/*
+ * Copyright (C) 2014-2015 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * This file contains the Broadcom Cygnus GPIO driver that supports 3
+ * GPIO controllers on Cygnus including the ASIU GPIO controller, the
+ * chipCommonG GPIO controller, and the always-on GPIO controller. Basic
+ * PINCONF such as bias pull up/down, and drive strength are also supported
+ * in this driver.
+ *
+ * Pins from the ASIU GPIO can be individually muxed to GPIO function,
+ * through the interaction with the Cygnus IOMUX controller
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/ioport.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+
+#include "../pinctrl-utils.h"
+
+#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
+#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
+#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
+#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
+#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
+#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
+#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
+#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
+#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
+#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
+#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
+#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
+
+/* drive strength control for ASIU GPIO */
+#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
+
+/* drive strength control for CCM/CRMU (AON) GPIO */
+#define CYGNUS_GPIO_DRV0_CTRL_OFFSET  0x00
+
+#define GPIO_BANK_SIZE 0x200
+#define NGPIOS_PER_BANK 32
+#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
+
+#define CYGNUS_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + (reg))
+#define CYGNUS_GPIO_SHIFT(pin) ((pin) % NGPIOS_PER_BANK)
+
+#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
+#define GPIO_DRV_STRENGTH_BITS       3
+#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
+
+/*
+ * Cygnus GPIO core
+ *
+ * @dev: pointer to device
+ * @base: I/O register base for Cygnus GPIO controller
+ * @io_ctrl: I/O register base for certain type of Cygnus GPIO controller that
+ * has the PINCONF support implemented outside of the GPIO block
+ * @lock: lock to protect access to I/O registers
+ * @gc: GPIO chip
+ * @num_banks: number of GPIO banks, each bank supports up to 32 GPIOs
+ * @pinmux_is_supported: flag to indicate this GPIO controller contains pins
+ * that can be individually muxed to GPIO
+ * @pctl: pointer to pinctrl_dev
+ * @pctldesc: pinctrl descriptor
+ * @pins: pointer to array of pins
+ */
+struct cygnus_gpio {
+	struct device *dev;
+
+	void __iomem *base;
+	void __iomem *io_ctrl;
+
+	spinlock_t lock;
+
+	struct gpio_chip gc;
+	unsigned num_banks;
+
+	int pinmux_is_supported;
+
+	struct pinctrl_dev *pctl;
+	struct pinctrl_desc pctldesc;
+	struct pinctrl_pin_desc *pins;
+};
+
+static struct cygnus_gpio *to_cygnus_gpio(struct gpio_chip *gc)
+{
+	return container_of(gc, struct cygnus_gpio, gc);
+}
+
+/*
+ * Mapping from PINCONF pins to GPIO pins is 1-to-1
+ */
+static unsigned cygnus_pin_to_gpio(unsigned pin)
+{
+	return pin;
+}
+
+static u32 cygnus_readl(struct cygnus_gpio *chip, unsigned int offset)
+{
+	return readl(chip->base + offset);
+}
+
+static void cygnus_writel(struct cygnus_gpio *chip, unsigned int offset,
+			  u32 val)
+{
+	writel(val, chip->base + offset);
+}
+
+/**
+ *  cygnus_set_bit - set or clear one bit (corresponding to the GPIO pin) in a
+ *  Cygnus GPIO register
+ *
+ *  @cygnus_gpio: Cygnus GPIO device
+ *  @reg: register offset
+ *  @gpio: GPIO pin
+ *  @set: set or clear. 1 - set; 0 -clear
+ */
+static void cygnus_set_bit(struct cygnus_gpio *chip, unsigned int reg,
+			   unsigned gpio, int set)
+{
+	unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val;
+
+	val = cygnus_readl(chip, offset);
+	if (set)
+		val |= BIT(shift);
+	else
+		val &= ~BIT(shift);
+	cygnus_writel(chip, offset, val);
+}
+
+static int cygnus_get_bit(struct cygnus_gpio *chip, unsigned int reg,
+			  unsigned gpio)
+{
+	unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val;
+
+	val = cygnus_readl(chip, offset) & BIT(shift);
+	if (val)
+		return 1;
+	else
+		return 0;
+}
+
+static void cygnus_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+	struct gpio_chip *gc = irq_desc_get_handler_data(desc);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	struct irq_chip *irq_chip = irq_desc_get_chip(desc);
+	int i, bit;
+
+	chained_irq_enter(irq_chip, desc);
+
+	/* go through the entire GPIO banks and handle all interrupts */
+	for (i = 0; i < chip->num_banks; i++) {
+		unsigned long val = cygnus_readl(chip,
+				(i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_MSTAT_OFFSET);
+
+		for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
+			unsigned pin = NGPIOS_PER_BANK * i + bit;
+			int child_irq = irq_find_mapping(gc->irqdomain, pin);
+
+			/*
+			 * Clear the interrupt before invoking the
+			 * handler, so we do not leave any window
+			 */
+			cygnus_writel(chip, (i * GPIO_BANK_SIZE) +
+				      CYGNUS_GPIO_INT_CLR_OFFSET, BIT(bit));
+
+			generic_handle_irq(child_irq);
+		}
+	}
+
+	chained_irq_exit(irq_chip, desc);
+}
+
+
+static void cygnus_gpio_irq_ack(struct irq_data *d)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned gpio = d->hwirq;
+	unsigned int offset = CYGNUS_GPIO_REG(gpio,
+			CYGNUS_GPIO_INT_CLR_OFFSET);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val = BIT(shift);
+
+	cygnus_writel(chip, offset, val);
+}
+
+/**
+ *  cygnus_gpio_irq_set_mask - mask/unmask a GPIO interrupt
+ *
+ *  @d: IRQ chip data
+ *  @mask: mask/unmask GPIO interrupt. 0 - mask (disable); 1 - unmask (enable)
+ */
+static void cygnus_gpio_irq_set_mask(struct irq_data *d, int mask)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned gpio = d->hwirq;
+
+	cygnus_set_bit(chip, CYGNUS_GPIO_INT_MSK_OFFSET, gpio, mask);
+}
+
+static void cygnus_gpio_irq_mask(struct irq_data *d)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_gpio_irq_set_mask(d, 0);
+	spin_unlock_irqrestore(&chip->lock, flags);
+}
+
+static void cygnus_gpio_irq_unmask(struct irq_data *d)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_gpio_irq_set_mask(d, 1);
+	spin_unlock_irqrestore(&chip->lock, flags);
+}
+
+static int cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned gpio = d->hwirq;
+	int int_type = 0, dual_edge = 0, edge_lvl = 0;
+	unsigned long flags;
+
+	switch (type & IRQ_TYPE_SENSE_MASK) {
+	case IRQ_TYPE_EDGE_RISING:
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_EDGE_FALLING:
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		dual_edge = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_HIGH:
+		int_type = 1;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_LOW:
+		int_type = 1;
+		break;
+
+	default:
+		dev_err(chip->dev, "invalid GPIO IRQ type 0x%x\n",
+			type);
+		return -EINVAL;
+	}
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_set_bit(chip, CYGNUS_GPIO_IN_TYPE_OFFSET, gpio, int_type);
+	cygnus_set_bit(chip, CYGNUS_GPIO_INT_DE_OFFSET, gpio, dual_edge);
+	cygnus_set_bit(chip, CYGNUS_GPIO_INT_EDGE_OFFSET, gpio,
+		       edge_lvl);
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	dev_dbg(chip->dev,
+		"gpio:%u set int_type:%d dual_edge:%d edge_lvl:%d\n",
+		gpio, int_type, dual_edge, edge_lvl);
+
+	return 0;
+}
+
+static struct irq_chip cygnus_gpio_irq_chip = {
+	.name = "bcm-cygnus-gpio",
+	.irq_ack = cygnus_gpio_irq_ack,
+	.irq_mask = cygnus_gpio_irq_mask,
+	.irq_unmask = cygnus_gpio_irq_unmask,
+	.irq_set_type = cygnus_gpio_irq_set_type,
+};
+
+/*
+ * Request the Cygnus IOMUX pinmux controller to mux individual pins to GPIO
+ */
+static int cygnus_gpio_request(struct gpio_chip *gc, unsigned offset)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned gpio = gc->base + offset;
+
+	/* not all Cygnus GPIO pins can be muxed individually */
+	if (!chip->pinmux_is_supported)
+		return 0;
+
+	return pinctrl_request_gpio(gpio);
+}
+
+static void cygnus_gpio_free(struct gpio_chip *gc, unsigned offset)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned gpio = gc->base + offset;
+
+	if (!chip->pinmux_is_supported)
+		return;
+
+	pinctrl_free_gpio(gpio);
+}
+
+static int cygnus_gpio_direction_input(struct gpio_chip *gc, unsigned gpio)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_set_bit(chip, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 0);
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	dev_dbg(chip->dev, "gpio:%u set input\n", gpio);
+
+	return 0;
+}
+
+static int cygnus_gpio_direction_output(struct gpio_chip *gc, unsigned gpio,
+					int value)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_set_bit(chip, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 1);
+	cygnus_set_bit(chip, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	dev_dbg(chip->dev, "gpio:%u set output, value:%d\n", gpio, value);
+
+	return 0;
+}
+
+static void cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio, int value)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_set_bit(chip, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	dev_dbg(chip->dev, "gpio:%u set, value:%d\n", gpio, value);
+}
+
+static int cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned int offset = CYGNUS_GPIO_REG(gpio,
+					      CYGNUS_GPIO_DATA_IN_OFFSET);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+
+	return !!(cygnus_readl(chip, offset) & BIT(shift));
+}
+
+static int cygnus_get_groups_count(struct pinctrl_dev *pctldev)
+{
+	return 1;
+}
+
+/*
+ * Only one group: "gpio_grp", since this local pinctrl device only performs
+ * GPIO specific PINCONF configurations
+ */
+static const char *cygnus_get_group_name(struct pinctrl_dev *pctldev,
+					 unsigned selector)
+{
+
+	return "gpio_grp";
+}
+
+static const struct pinctrl_ops cygnus_pctrl_ops = {
+	.get_groups_count = cygnus_get_groups_count,
+	.get_group_name = cygnus_get_group_name,
+	.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
+	.dt_free_map = pinctrl_utils_dt_free_map,
+};
+
+static int cygnus_gpio_set_pull(struct cygnus_gpio *chip, unsigned gpio,
+				int disable, int pull_up)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+
+	if (disable) {
+		cygnus_set_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio, 0);
+	} else {
+		cygnus_set_bit(chip, CYGNUS_GPIO_PAD_RES_OFFSET, gpio,
+			       pull_up);
+		cygnus_set_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio, 1);
+	}
+
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	dev_dbg(chip->dev, "gpio:%u set pullup:%d\n", gpio, pull_up);
+
+	return 0;
+}
+
+static void cygnus_gpio_get_pull(struct cygnus_gpio *chip, unsigned gpio,
+				 int *disable, int *pull_up)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	*disable = !cygnus_get_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio);
+	*pull_up = cygnus_get_bit(chip, CYGNUS_GPIO_PAD_RES_OFFSET, gpio);
+	spin_unlock_irqrestore(&chip->lock, flags);
+}
+
+static int cygnus_gpio_set_strength(struct cygnus_gpio *chip, unsigned gpio,
+				    unsigned strength)
+{
+	void __iomem *base;
+	unsigned int i, offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	/* make sure drive strength is supported */
+	if (strength < 2 ||  strength > 16 || (strength % 2))
+		return -ENOTSUPP;
+
+	if (chip->io_ctrl) {
+		base = chip->io_ctrl;
+		offset = CYGNUS_GPIO_DRV0_CTRL_OFFSET;
+	} else {
+		base = chip->base;
+		offset = CYGNUS_GPIO_REG(gpio,
+					 CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET);
+	}
+
+	shift = CYGNUS_GPIO_SHIFT(gpio);
+
+	dev_dbg(chip->dev, "gpio:%u set drive strength:%d mA\n", gpio,
+		strength);
+
+	spin_lock_irqsave(&chip->lock, flags);
+	strength = (strength / 2) - 1;
+	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
+		val = readl(base + offset);
+		val &= ~BIT(shift);
+		val |= ((strength >> i) & 0x1) << shift;
+		writel(val, base + offset);
+		offset += 4;
+	}
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	return 0;
+}
+
+static int cygnus_gpio_get_strength(struct cygnus_gpio *chip, unsigned gpio,
+				    u16 *strength)
+{
+	void __iomem *base;
+	unsigned int i, offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	if (chip->io_ctrl) {
+		base = chip->io_ctrl;
+		offset = CYGNUS_GPIO_DRV0_CTRL_OFFSET;
+	} else {
+		base = chip->base;
+		offset = CYGNUS_GPIO_REG(gpio,
+					 CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET);
+	}
+
+	shift = CYGNUS_GPIO_SHIFT(gpio);
+
+	spin_lock_irqsave(&chip->lock, flags);
+	*strength = 0;
+	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
+		val = readl(base + offset) & BIT(shift);
+		val >>= shift;
+		*strength += (val << i);
+		offset += 4;
+	}
+
+	/* convert to mA */
+	*strength = (*strength + 1) * 2;
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	return 0;
+}
+
+static int cygnus_pin_config_get(struct pinctrl_dev *pctldev, unsigned pin,
+				 unsigned long *config)
+{
+	struct cygnus_gpio *chip = pinctrl_dev_get_drvdata(pctldev);
+	enum pin_config_param param = pinconf_to_config_param(*config);
+	unsigned gpio = cygnus_pin_to_gpio(pin);
+	u16 arg;
+	int disable, pull_up, ret;
+
+	switch (param) {
+	case PIN_CONFIG_BIAS_DISABLE:
+		cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
+		if (disable)
+			return 0;
+		else
+			return -EINVAL;
+
+	case PIN_CONFIG_BIAS_PULL_UP:
+		cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
+		if (!disable && pull_up)
+			return 0;
+		else
+			return -EINVAL;
+
+	case PIN_CONFIG_BIAS_PULL_DOWN:
+		cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
+		if (!disable && !pull_up)
+			return 0;
+		else
+			return -EINVAL;
+
+	case PIN_CONFIG_DRIVE_STRENGTH:
+		ret = cygnus_gpio_get_strength(chip, gpio, &arg);
+		if (ret)
+			return ret;
+		else
+			*config = pinconf_to_config_packed(param, arg);
+
+		return 0;
+
+	default:
+		return -ENOTSUPP;
+	}
+
+	return -ENOTSUPP;
+}
+
+static int cygnus_pin_config_set(struct pinctrl_dev *pctldev, unsigned pin,
+				 unsigned long *configs, unsigned num_configs)
+{
+	struct cygnus_gpio *chip = pinctrl_dev_get_drvdata(pctldev);
+	enum pin_config_param param;
+	u16 arg;
+	unsigned i, gpio = cygnus_pin_to_gpio(pin);
+	int ret = -ENOTSUPP;
+
+	for (i = 0; i < num_configs; i++) {
+		param = pinconf_to_config_param(configs[i]);
+		arg = pinconf_to_config_argument(configs[i]);
+
+		switch (param) {
+		case PIN_CONFIG_BIAS_DISABLE:
+			ret = cygnus_gpio_set_pull(chip, gpio, 1, 0);
+			if (ret < 0)
+				goto out;
+			break;
+
+		case PIN_CONFIG_BIAS_PULL_UP:
+			ret = cygnus_gpio_set_pull(chip, gpio, 0, 1);
+			if (ret < 0)
+				goto out;
+			break;
+
+		case PIN_CONFIG_BIAS_PULL_DOWN:
+			ret = cygnus_gpio_set_pull(chip, gpio, 0, 0);
+			if (ret < 0)
+				goto out;
+			break;
+
+		case PIN_CONFIG_DRIVE_STRENGTH:
+			ret = cygnus_gpio_set_strength(chip, gpio, arg);
+			if (ret < 0)
+				goto out;
+			break;
+
+		default:
+			dev_err(chip->dev, "invalid configuration\n");
+			return -ENOTSUPP;
+		}
+	} /* for each config */
+
+out:
+	return ret;
+}
+
+static const struct pinconf_ops cygnus_pconf_ops = {
+	.is_generic = true,
+	.pin_config_get = cygnus_pin_config_get,
+	.pin_config_set = cygnus_pin_config_set,
+};
+
+/*
+ * Map a GPIO in the local gpio_chip pin space to a pin in the Cygnus IOMUX
+ * pinctrl pin space
+ */
+struct cygnus_gpio_pin_range {
+	unsigned offset;
+	unsigned pin_base;
+	unsigned num_pins;
+};
+
+#define CYGNUS_PINRANGE(o, p, n) { .offset = o, .pin_base = p, .num_pins = n }
+
+/*
+ * Pin mapping table for mapping local GPIO pins to Cygnus IOMUX pinctrl pins
+ */
+static const struct cygnus_gpio_pin_range cygnus_gpio_pintable[] = {
+	CYGNUS_PINRANGE(0, 42, 1),
+	CYGNUS_PINRANGE(1, 44, 3),
+	CYGNUS_PINRANGE(4, 48, 1),
+	CYGNUS_PINRANGE(5, 50, 3),
+	CYGNUS_PINRANGE(8, 126, 1),
+	CYGNUS_PINRANGE(9, 155, 1),
+	CYGNUS_PINRANGE(10, 152, 1),
+	CYGNUS_PINRANGE(11, 154, 1),
+	CYGNUS_PINRANGE(12, 153, 1),
+	CYGNUS_PINRANGE(13, 127, 3),
+	CYGNUS_PINRANGE(16, 140, 1),
+	CYGNUS_PINRANGE(17, 145, 7),
+	CYGNUS_PINRANGE(24, 130, 10),
+	CYGNUS_PINRANGE(34, 141, 4),
+	CYGNUS_PINRANGE(38, 54, 1),
+	CYGNUS_PINRANGE(39, 56, 3),
+	CYGNUS_PINRANGE(42, 60, 3),
+	CYGNUS_PINRANGE(45, 64, 3),
+	CYGNUS_PINRANGE(48, 68, 2),
+	CYGNUS_PINRANGE(50, 84, 6),
+	CYGNUS_PINRANGE(56, 94, 6),
+	CYGNUS_PINRANGE(62, 72, 1),
+	CYGNUS_PINRANGE(63, 70, 1),
+	CYGNUS_PINRANGE(64, 80, 1),
+	CYGNUS_PINRANGE(65, 74, 3),
+	CYGNUS_PINRANGE(68, 78, 1),
+	CYGNUS_PINRANGE(69, 82, 1),
+	CYGNUS_PINRANGE(70, 156, 17),
+	CYGNUS_PINRANGE(87, 104, 12),
+	CYGNUS_PINRANGE(99, 102, 2),
+	CYGNUS_PINRANGE(101, 90, 4),
+	CYGNUS_PINRANGE(105, 116, 10),
+	CYGNUS_PINRANGE(123, 11, 1),
+	CYGNUS_PINRANGE(124, 38, 4),
+	CYGNUS_PINRANGE(128, 43, 1),
+	CYGNUS_PINRANGE(129, 47, 1),
+	CYGNUS_PINRANGE(130, 49, 1),
+	CYGNUS_PINRANGE(131, 53, 1),
+	CYGNUS_PINRANGE(132, 55, 1),
+	CYGNUS_PINRANGE(133, 59, 1),
+	CYGNUS_PINRANGE(134, 63, 1),
+	CYGNUS_PINRANGE(135, 67, 1),
+	CYGNUS_PINRANGE(136, 71, 1),
+	CYGNUS_PINRANGE(137, 73, 1),
+	CYGNUS_PINRANGE(138, 77, 1),
+	CYGNUS_PINRANGE(139, 79, 1),
+	CYGNUS_PINRANGE(140, 81, 1),
+	CYGNUS_PINRANGE(141, 83, 1),
+	CYGNUS_PINRANGE(142, 10, 1)
+};
+
+/*
+ * The Cygnus IOMUX controller mainly supports group based mux configuration,
+ * but certain pins can be muxed to GPIO individually. Only the ASIU GPIO
+ * controller can support this, so it's an optional configuration
+ *
+ * Return -ENODEV means no support and that's fine
+ */
+static int cygnus_gpio_pinmux_add_range(struct cygnus_gpio *chip)
+{
+	struct device_node *node = chip->dev->of_node;
+	struct device_node *pinmux_node;
+	struct platform_device *pinmux_pdev;
+	struct gpio_chip *gc = &chip->gc;
+	int i, ret;
+
+	/* parse DT to find the phandle to the pinmux controller */
+	pinmux_node = of_parse_phandle(node, "pinmux", 0);
+	if (!pinmux_node)
+		return -ENODEV;
+
+	pinmux_pdev = of_find_device_by_node(pinmux_node);
+	if (!pinmux_pdev) {
+		dev_err(chip->dev, "failed to get pinmux device\n");
+		return -EINVAL;
+	}
+
+	/* now need to create the mapping between local GPIO and PINMUX pins */
+	for (i = 0; i < ARRAY_SIZE(cygnus_gpio_pintable); i++) {
+		ret = gpiochip_add_pin_range(gc, dev_name(&pinmux_pdev->dev),
+					     cygnus_gpio_pintable[i].offset,
+					     cygnus_gpio_pintable[i].pin_base,
+					     cygnus_gpio_pintable[i].num_pins);
+		if (ret) {
+			dev_err(chip->dev, "unable to add GPIO pin range\n");
+			goto err_rm_pin_range;
+		}
+	}
+
+	chip->pinmux_is_supported = 1;
+	return 0;
+
+err_rm_pin_range:
+	gpiochip_remove_pin_ranges(gc);
+	return ret;
+}
+
+static void cygnus_gpio_pinmux_remove_range(struct cygnus_gpio *chip)
+{
+	struct gpio_chip *gc = &chip->gc;
+
+	if (chip->pinmux_is_supported)
+		gpiochip_remove_pin_ranges(gc);
+}
+
+/*
+ * Cygnus GPIO controller supports some PINCONF related configurations such as
+ * pull up, pull down, and drive strength, when the pin is configured to GPIO
+ *
+ * Here a local pinctrl device is created with simple 1-to-1 pin mapping to the
+ * local GPIO pins
+ */
+static int cygnus_gpio_register_pinconf(struct cygnus_gpio *chip)
+{
+	struct pinctrl_desc *pctldesc = &chip->pctldesc;
+	struct pinctrl_pin_desc *pins;
+	struct gpio_chip *gc = &chip->gc;
+	int i, ret;
+
+	pins = devm_kcalloc(chip->dev, gc->ngpio, sizeof(*pins), GFP_KERNEL);
+	if (!pins)
+		return -ENOMEM;
+	chip->pins = pins;
+
+	for (i = 0; i < gc->ngpio; i++) {
+		pins[i].number = i;
+		pins[i].name = kasprintf(GFP_KERNEL, "gpio-%d", i);
+		if (!pins[i].name) {
+			ret = -ENOMEM;
+			goto err_kfree;
+		}
+	}
+
+	pctldesc->name = dev_name(chip->dev);
+	pctldesc->pctlops = &cygnus_pctrl_ops;
+	pctldesc->pins = pins;
+	pctldesc->npins = gc->ngpio;
+	pctldesc->confops = &cygnus_pconf_ops;
+
+	chip->pctl = pinctrl_register(pctldesc, chip->dev, chip);
+	if (!chip->pctl) {
+		dev_err(chip->dev, "unable to register pinctrl device\n");
+		ret = -EINVAL;
+		goto err_kfree;
+	}
+
+	return 0;
+
+err_kfree:
+	for (i = 0; i < gc->ngpio; i++)
+		kfree(pins[i].name);
+
+	return ret;
+}
+
+static void cygnus_gpio_unregister_pinconf(struct cygnus_gpio *chip)
+{
+	struct gpio_chip *gc = &chip->gc;
+	int i;
+
+	if (chip->pctl)
+		pinctrl_unregister(chip->pctl);
+
+	for (i = 0; i < gc->ngpio; i++)
+		kfree(chip->pins[i].name);
+}
+
+static const struct of_device_id cygnus_gpio_of_match[] = {
+	{ .compatible = "brcm,cygnus-gpio" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, cygnus_gpio_of_match);
+
+static int cygnus_gpio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+	struct cygnus_gpio *chip;
+	struct gpio_chip *gc;
+	u32 ngpios;
+	int irq, ret;
+
+	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
+	chip->dev = dev;
+	platform_set_drvdata(pdev, chip);
+
+	if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
+		dev_err(dev, "missing ngpios DT property\n");
+		return -ENODEV;
+	}
+	chip->num_banks = (ngpios + NGPIOS_PER_BANK - 1) / NGPIOS_PER_BANK;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	chip->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(chip->base)) {
+		dev_err(dev, "unable to map I/O memory\n");
+		return PTR_ERR(chip->base);
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (res) {
+		chip->io_ctrl = devm_ioremap_resource(dev, res);
+		if (IS_ERR(chip->io_ctrl)) {
+			dev_err(dev, "unable to map I/O memory\n");
+			return PTR_ERR(chip->io_ctrl);
+		}
+	}
+
+	spin_lock_init(&chip->lock);
+
+	gc = &chip->gc;
+	gc->base = -1;
+	gc->ngpio = ngpios;
+	gc->label = dev_name(dev);
+	gc->dev = dev;
+	gc->of_node = dev->of_node;
+	gc->request = cygnus_gpio_request;
+	gc->free = cygnus_gpio_free;
+	gc->direction_input = cygnus_gpio_direction_input;
+	gc->direction_output = cygnus_gpio_direction_output;
+	gc->set = cygnus_gpio_set;
+	gc->get = cygnus_gpio_get;
+
+	ret = gpiochip_add(gc);
+	if (ret < 0) {
+		dev_err(dev, "unable to add GPIO chip\n");
+		return ret;
+	}
+
+	ret = cygnus_gpio_pinmux_add_range(chip);
+	if (ret && ret != -ENODEV) {
+		dev_err(dev, "unable to add GPIO pin range\n");
+		goto err_rm_gpiochip;
+	}
+
+	ret = cygnus_gpio_register_pinconf(chip);
+	if (ret) {
+		dev_err(dev, "unable to register pinconf\n");
+		goto err_rm_range;
+	}
+
+	/* optional GPIO interrupt support */
+	irq = platform_get_irq(pdev, 0);
+	if (irq) {
+		ret = gpiochip_irqchip_add(gc, &cygnus_gpio_irq_chip, 0,
+					   handle_simple_irq, IRQ_TYPE_NONE);
+		if (ret) {
+			dev_err(dev, "no GPIO irqchip\n");
+			goto err_unregister_pinconf;
+		}
+
+		gpiochip_set_chained_irqchip(gc, &cygnus_gpio_irq_chip, irq,
+					     cygnus_gpio_irq_handler);
+	}
+
+	return 0;
+
+err_unregister_pinconf:
+	cygnus_gpio_unregister_pinconf(chip);
+
+err_rm_range:
+	cygnus_gpio_pinmux_remove_range(chip);
+
+err_rm_gpiochip:
+	gpiochip_remove(gc);
+
+	return ret;
+}
+
+static struct platform_driver cygnus_gpio_driver = {
+	.driver = {
+		.name = "cygnus-gpio",
+		.of_match_table = cygnus_gpio_of_match,
+	},
+	.probe = cygnus_gpio_probe,
+};
+
+static int __init cygnus_gpio_init(void)
+{
+	return platform_driver_probe(&cygnus_gpio_driver, cygnus_gpio_probe);
+}
+arch_initcall_sync(cygnus_gpio_init);
+
+MODULE_AUTHOR("Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>");
+MODULE_DESCRIPTION("Broadcom Cygnus GPIO Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

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[PATCH v7 2/4] pinctrl: cygnus: add gpio/pinconf driver

[Ray Jui]

This adds the initial support of the Broadcom Cygnus GPIO/PINCONF driver
that supports all 3 GPIO controllers on Cygnus including the ASIU GPIO
controller, the chipCommonG GPIO controller, and the always-on GPIO
controller. Basic PINCONF configurations such as bias pull up/down, and
drive strength are also supported in this driver.

Pins from the ASIU GPIO controller can be individually muxed to GPIO
function, through interaction with the Cygnus IOMUX controller

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/pinctrl/bcm/Kconfig               |   22 +
 drivers/pinctrl/bcm/Makefile              |    1 +
 drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c |  920 +++++++++++++++++++++++++++++
 3 files changed, 943 insertions(+)
 create mode 100644 drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c

diff --git a/drivers/pinctrl/bcm/Kconfig b/drivers/pinctrl/bcm/Kconfig
index eb13201..cd11d4d 100644
--- a/drivers/pinctrl/bcm/Kconfig
+++ b/drivers/pinctrl/bcm/Kconfig
@@ -20,6 +20,28 @@ config PINCTRL_BCM2835
 	select PINMUX
 	select PINCONF
 
+config PINCTRL_CYGNUS_GPIO
+	bool "Broadcom Cygnus GPIO (with PINCONF) driver"
+	depends on OF_GPIO && ARCH_BCM_CYGNUS
+	select GPIOLIB_IRQCHIP
+	select PINCONF
+	select GENERIC_PINCONF
+	default ARCH_BCM_CYGNUS
+	help
+	  Say yes here to enable the Broadcom Cygnus GPIO driver.
+
+	  The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
+	  GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
+	  the always-ON GPIO controller (CRMU/AON). All 3 GPIO controllers are
+	  supported by this driver.
+
+	  All 3 Cygnus GPIO controllers support basic PINCONF functions such
+	  as bias pull up, pull down, and drive strength configurations, when
+	  these pins are muxed to GPIO.
+
+	  Pins from the ASIU GPIO can be individually muxed to GPIO function,
+	  through interaction with the Cygnus IOMUX controller.
+
 config PINCTRL_CYGNUS_MUX
 	bool "Broadcom Cygnus IOMUX driver"
 	depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
diff --git a/drivers/pinctrl/bcm/Makefile b/drivers/pinctrl/bcm/Makefile
index bb6beb6..2b2f70e 100644
--- a/drivers/pinctrl/bcm/Makefile
+++ b/drivers/pinctrl/bcm/Makefile
@@ -2,4 +2,5 @@
 
 obj-$(CONFIG_PINCTRL_BCM281XX)		+= pinctrl-bcm281xx.o
 obj-$(CONFIG_PINCTRL_BCM2835)		+= pinctrl-bcm2835.o
+obj-$(CONFIG_PINCTRL_CYGNUS_GPIO)	+= pinctrl-cygnus-gpio.o
 obj-$(CONFIG_PINCTRL_CYGNUS_MUX)	+= pinctrl-cygnus-mux.o
diff --git a/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c b/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c
new file mode 100644
index 0000000..cfe4478
--- /dev/null
+++ b/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c
@@ -0,0 +1,920 @@
+/*
+ * Copyright (C) 2014-2015 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * This file contains the Broadcom Cygnus GPIO driver that supports 3
+ * GPIO controllers on Cygnus including the ASIU GPIO controller, the
+ * chipCommonG GPIO controller, and the always-on GPIO controller. Basic
+ * PINCONF such as bias pull up/down, and drive strength are also supported
+ * in this driver.
+ *
+ * Pins from the ASIU GPIO can be individually muxed to GPIO function,
+ * through the interaction with the Cygnus IOMUX controller
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/ioport.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+
+#include "../pinctrl-utils.h"
+
+#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
+#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
+#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
+#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
+#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
+#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
+#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
+#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
+#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
+#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
+#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
+#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
+
+/* drive strength control for ASIU GPIO */
+#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
+
+/* drive strength control for CCM/CRMU (AON) GPIO */
+#define CYGNUS_GPIO_DRV0_CTRL_OFFSET  0x00
+
+#define GPIO_BANK_SIZE 0x200
+#define NGPIOS_PER_BANK 32
+#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
+
+#define CYGNUS_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + (reg))
+#define CYGNUS_GPIO_SHIFT(pin) ((pin) % NGPIOS_PER_BANK)
+
+#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
+#define GPIO_DRV_STRENGTH_BITS       3
+#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
+
+/*
+ * Cygnus GPIO core
+ *
+ * @dev: pointer to device
+ * @base: I/O register base for Cygnus GPIO controller
+ * @io_ctrl: I/O register base for certain type of Cygnus GPIO controller that
+ * has the PINCONF support implemented outside of the GPIO block
+ * @lock: lock to protect access to I/O registers
+ * @gc: GPIO chip
+ * @num_banks: number of GPIO banks, each bank supports up to 32 GPIOs
+ * @pinmux_is_supported: flag to indicate this GPIO controller contains pins
+ * that can be individually muxed to GPIO
+ * @pctl: pointer to pinctrl_dev
+ * @pctldesc: pinctrl descriptor
+ * @pins: pointer to array of pins
+ */
+struct cygnus_gpio {
+	struct device *dev;
+
+	void __iomem *base;
+	void __iomem *io_ctrl;
+
+	spinlock_t lock;
+
+	struct gpio_chip gc;
+	unsigned num_banks;
+
+	int pinmux_is_supported;
+
+	struct pinctrl_dev *pctl;
+	struct pinctrl_desc pctldesc;
+	struct pinctrl_pin_desc *pins;
+};
+
+static struct cygnus_gpio *to_cygnus_gpio(struct gpio_chip *gc)
+{
+	return container_of(gc, struct cygnus_gpio, gc);
+}
+
+/*
+ * Mapping from PINCONF pins to GPIO pins is 1-to-1
+ */
+static unsigned cygnus_pin_to_gpio(unsigned pin)
+{
+	return pin;
+}
+
+static u32 cygnus_readl(struct cygnus_gpio *chip, unsigned int offset)
+{
+	return readl(chip->base + offset);
+}
+
+static void cygnus_writel(struct cygnus_gpio *chip, unsigned int offset,
+			  u32 val)
+{
+	writel(val, chip->base + offset);
+}
+
+/**
+ *  cygnus_set_bit - set or clear one bit (corresponding to the GPIO pin) in a
+ *  Cygnus GPIO register
+ *
+ *  @cygnus_gpio: Cygnus GPIO device
+ *  @reg: register offset
+ *  @gpio: GPIO pin
+ *  @set: set or clear. 1 - set; 0 -clear
+ */
+static void cygnus_set_bit(struct cygnus_gpio *chip, unsigned int reg,
+			   unsigned gpio, int set)
+{
+	unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val;
+
+	val = cygnus_readl(chip, offset);
+	if (set)
+		val |= BIT(shift);
+	else
+		val &= ~BIT(shift);
+	cygnus_writel(chip, offset, val);
+}
+
+static int cygnus_get_bit(struct cygnus_gpio *chip, unsigned int reg,
+			  unsigned gpio)
+{
+	unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val;
+
+	val = cygnus_readl(chip, offset) & BIT(shift);
+	if (val)
+		return 1;
+	else
+		return 0;
+}
+
+static void cygnus_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+	struct gpio_chip *gc = irq_desc_get_handler_data(desc);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	struct irq_chip *irq_chip = irq_desc_get_chip(desc);
+	int i, bit;
+
+	chained_irq_enter(irq_chip, desc);
+
+	/* go through the entire GPIO banks and handle all interrupts */
+	for (i = 0; i < chip->num_banks; i++) {
+		unsigned long val = cygnus_readl(chip,
+				(i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_MSTAT_OFFSET);
+
+		for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
+			unsigned pin = NGPIOS_PER_BANK * i + bit;
+			int child_irq = irq_find_mapping(gc->irqdomain, pin);
+
+			/*
+			 * Clear the interrupt before invoking the
+			 * handler, so we do not leave any window
+			 */
+			cygnus_writel(chip, (i * GPIO_BANK_SIZE) +
+				      CYGNUS_GPIO_INT_CLR_OFFSET, BIT(bit));
+
+			generic_handle_irq(child_irq);
+		}
+	}
+
+	chained_irq_exit(irq_chip, desc);
+}
+
+
+static void cygnus_gpio_irq_ack(struct irq_data *d)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned gpio = d->hwirq;
+	unsigned int offset = CYGNUS_GPIO_REG(gpio,
+			CYGNUS_GPIO_INT_CLR_OFFSET);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val = BIT(shift);
+
+	cygnus_writel(chip, offset, val);
+}
+
+/**
+ *  cygnus_gpio_irq_set_mask - mask/unmask a GPIO interrupt
+ *
+ *  @d: IRQ chip data
+ *  @mask: mask/unmask GPIO interrupt. 0 - mask (disable); 1 - unmask (enable)
+ */
+static void cygnus_gpio_irq_set_mask(struct irq_data *d, int mask)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned gpio = d->hwirq;
+
+	cygnus_set_bit(chip, CYGNUS_GPIO_INT_MSK_OFFSET, gpio, mask);
+}
+
+static void cygnus_gpio_irq_mask(struct irq_data *d)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_gpio_irq_set_mask(d, 0);
+	spin_unlock_irqrestore(&chip->lock, flags);
+}
+
+static void cygnus_gpio_irq_unmask(struct irq_data *d)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_gpio_irq_set_mask(d, 1);
+	spin_unlock_irqrestore(&chip->lock, flags);
+}
+
+static int cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned gpio = d->hwirq;
+	int int_type = 0, dual_edge = 0, edge_lvl = 0;
+	unsigned long flags;
+
+	switch (type & IRQ_TYPE_SENSE_MASK) {
+	case IRQ_TYPE_EDGE_RISING:
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_EDGE_FALLING:
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		dual_edge = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_HIGH:
+		int_type = 1;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_LOW:
+		int_type = 1;
+		break;
+
+	default:
+		dev_err(chip->dev, "invalid GPIO IRQ type 0x%x\n",
+			type);
+		return -EINVAL;
+	}
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_set_bit(chip, CYGNUS_GPIO_IN_TYPE_OFFSET, gpio, int_type);
+	cygnus_set_bit(chip, CYGNUS_GPIO_INT_DE_OFFSET, gpio, dual_edge);
+	cygnus_set_bit(chip, CYGNUS_GPIO_INT_EDGE_OFFSET, gpio,
+		       edge_lvl);
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	dev_dbg(chip->dev,
+		"gpio:%u set int_type:%d dual_edge:%d edge_lvl:%d\n",
+		gpio, int_type, dual_edge, edge_lvl);
+
+	return 0;
+}
+
+static struct irq_chip cygnus_gpio_irq_chip = {
+	.name = "bcm-cygnus-gpio",
+	.irq_ack = cygnus_gpio_irq_ack,
+	.irq_mask = cygnus_gpio_irq_mask,
+	.irq_unmask = cygnus_gpio_irq_unmask,
+	.irq_set_type = cygnus_gpio_irq_set_type,
+};
+
+/*
+ * Request the Cygnus IOMUX pinmux controller to mux individual pins to GPIO
+ */
+static int cygnus_gpio_request(struct gpio_chip *gc, unsigned offset)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned gpio = gc->base + offset;
+
+	/* not all Cygnus GPIO pins can be muxed individually */
+	if (!chip->pinmux_is_supported)
+		return 0;
+
+	return pinctrl_request_gpio(gpio);
+}
+
+static void cygnus_gpio_free(struct gpio_chip *gc, unsigned offset)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned gpio = gc->base + offset;
+
+	if (!chip->pinmux_is_supported)
+		return;
+
+	pinctrl_free_gpio(gpio);
+}
+
+static int cygnus_gpio_direction_input(struct gpio_chip *gc, unsigned gpio)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_set_bit(chip, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 0);
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	dev_dbg(chip->dev, "gpio:%u set input\n", gpio);
+
+	return 0;
+}
+
+static int cygnus_gpio_direction_output(struct gpio_chip *gc, unsigned gpio,
+					int value)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_set_bit(chip, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 1);
+	cygnus_set_bit(chip, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	dev_dbg(chip->dev, "gpio:%u set output, value:%d\n", gpio, value);
+
+	return 0;
+}
+
+static void cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio, int value)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_set_bit(chip, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	dev_dbg(chip->dev, "gpio:%u set, value:%d\n", gpio, value);
+}
+
+static int cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned int offset = CYGNUS_GPIO_REG(gpio,
+					      CYGNUS_GPIO_DATA_IN_OFFSET);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+
+	return !!(cygnus_readl(chip, offset) & BIT(shift));
+}
+
+static int cygnus_get_groups_count(struct pinctrl_dev *pctldev)
+{
+	return 1;
+}
+
+/*
+ * Only one group: "gpio_grp", since this local pinctrl device only performs
+ * GPIO specific PINCONF configurations
+ */
+static const char *cygnus_get_group_name(struct pinctrl_dev *pctldev,
+					 unsigned selector)
+{
+
+	return "gpio_grp";
+}
+
+static const struct pinctrl_ops cygnus_pctrl_ops = {
+	.get_groups_count = cygnus_get_groups_count,
+	.get_group_name = cygnus_get_group_name,
+	.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
+	.dt_free_map = pinctrl_utils_dt_free_map,
+};
+
+static int cygnus_gpio_set_pull(struct cygnus_gpio *chip, unsigned gpio,
+				int disable, int pull_up)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+
+	if (disable) {
+		cygnus_set_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio, 0);
+	} else {
+		cygnus_set_bit(chip, CYGNUS_GPIO_PAD_RES_OFFSET, gpio,
+			       pull_up);
+		cygnus_set_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio, 1);
+	}
+
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	dev_dbg(chip->dev, "gpio:%u set pullup:%d\n", gpio, pull_up);
+
+	return 0;
+}
+
+static void cygnus_gpio_get_pull(struct cygnus_gpio *chip, unsigned gpio,
+				 int *disable, int *pull_up)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	*disable = !cygnus_get_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio);
+	*pull_up = cygnus_get_bit(chip, CYGNUS_GPIO_PAD_RES_OFFSET, gpio);
+	spin_unlock_irqrestore(&chip->lock, flags);
+}
+
+static int cygnus_gpio_set_strength(struct cygnus_gpio *chip, unsigned gpio,
+				    unsigned strength)
+{
+	void __iomem *base;
+	unsigned int i, offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	/* make sure drive strength is supported */
+	if (strength < 2 ||  strength > 16 || (strength % 2))
+		return -ENOTSUPP;
+
+	if (chip->io_ctrl) {
+		base = chip->io_ctrl;
+		offset = CYGNUS_GPIO_DRV0_CTRL_OFFSET;
+	} else {
+		base = chip->base;
+		offset = CYGNUS_GPIO_REG(gpio,
+					 CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET);
+	}
+
+	shift = CYGNUS_GPIO_SHIFT(gpio);
+
+	dev_dbg(chip->dev, "gpio:%u set drive strength:%d mA\n", gpio,
+		strength);
+
+	spin_lock_irqsave(&chip->lock, flags);
+	strength = (strength / 2) - 1;
+	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
+		val = readl(base + offset);
+		val &= ~BIT(shift);
+		val |= ((strength >> i) & 0x1) << shift;
+		writel(val, base + offset);
+		offset += 4;
+	}
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	return 0;
+}
+
+static int cygnus_gpio_get_strength(struct cygnus_gpio *chip, unsigned gpio,
+				    u16 *strength)
+{
+	void __iomem *base;
+	unsigned int i, offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	if (chip->io_ctrl) {
+		base = chip->io_ctrl;
+		offset = CYGNUS_GPIO_DRV0_CTRL_OFFSET;
+	} else {
+		base = chip->base;
+		offset = CYGNUS_GPIO_REG(gpio,
+					 CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET);
+	}
+
+	shift = CYGNUS_GPIO_SHIFT(gpio);
+
+	spin_lock_irqsave(&chip->lock, flags);
+	*strength = 0;
+	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
+		val = readl(base + offset) & BIT(shift);
+		val >>= shift;
+		*strength += (val << i);
+		offset += 4;
+	}
+
+	/* convert to mA */
+	*strength = (*strength + 1) * 2;
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	return 0;
+}
+
+static int cygnus_pin_config_get(struct pinctrl_dev *pctldev, unsigned pin,
+				 unsigned long *config)
+{
+	struct cygnus_gpio *chip = pinctrl_dev_get_drvdata(pctldev);
+	enum pin_config_param param = pinconf_to_config_param(*config);
+	unsigned gpio = cygnus_pin_to_gpio(pin);
+	u16 arg;
+	int disable, pull_up, ret;
+
+	switch (param) {
+	case PIN_CONFIG_BIAS_DISABLE:
+		cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
+		if (disable)
+			return 0;
+		else
+			return -EINVAL;
+
+	case PIN_CONFIG_BIAS_PULL_UP:
+		cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
+		if (!disable && pull_up)
+			return 0;
+		else
+			return -EINVAL;
+
+	case PIN_CONFIG_BIAS_PULL_DOWN:
+		cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
+		if (!disable && !pull_up)
+			return 0;
+		else
+			return -EINVAL;
+
+	case PIN_CONFIG_DRIVE_STRENGTH:
+		ret = cygnus_gpio_get_strength(chip, gpio, &arg);
+		if (ret)
+			return ret;
+		else
+			*config = pinconf_to_config_packed(param, arg);
+
+		return 0;
+
+	default:
+		return -ENOTSUPP;
+	}
+
+	return -ENOTSUPP;
+}
+
+static int cygnus_pin_config_set(struct pinctrl_dev *pctldev, unsigned pin,
+				 unsigned long *configs, unsigned num_configs)
+{
+	struct cygnus_gpio *chip = pinctrl_dev_get_drvdata(pctldev);
+	enum pin_config_param param;
+	u16 arg;
+	unsigned i, gpio = cygnus_pin_to_gpio(pin);
+	int ret = -ENOTSUPP;
+
+	for (i = 0; i < num_configs; i++) {
+		param = pinconf_to_config_param(configs[i]);
+		arg = pinconf_to_config_argument(configs[i]);
+
+		switch (param) {
+		case PIN_CONFIG_BIAS_DISABLE:
+			ret = cygnus_gpio_set_pull(chip, gpio, 1, 0);
+			if (ret < 0)
+				goto out;
+			break;
+
+		case PIN_CONFIG_BIAS_PULL_UP:
+			ret = cygnus_gpio_set_pull(chip, gpio, 0, 1);
+			if (ret < 0)
+				goto out;
+			break;
+
+		case PIN_CONFIG_BIAS_PULL_DOWN:
+			ret = cygnus_gpio_set_pull(chip, gpio, 0, 0);
+			if (ret < 0)
+				goto out;
+			break;
+
+		case PIN_CONFIG_DRIVE_STRENGTH:
+			ret = cygnus_gpio_set_strength(chip, gpio, arg);
+			if (ret < 0)
+				goto out;
+			break;
+
+		default:
+			dev_err(chip->dev, "invalid configuration\n");
+			return -ENOTSUPP;
+		}
+	} /* for each config */
+
+out:
+	return ret;
+}
+
+static const struct pinconf_ops cygnus_pconf_ops = {
+	.is_generic = true,
+	.pin_config_get = cygnus_pin_config_get,
+	.pin_config_set = cygnus_pin_config_set,
+};
+
+/*
+ * Map a GPIO in the local gpio_chip pin space to a pin in the Cygnus IOMUX
+ * pinctrl pin space
+ */
+struct cygnus_gpio_pin_range {
+	unsigned offset;
+	unsigned pin_base;
+	unsigned num_pins;
+};
+
+#define CYGNUS_PINRANGE(o, p, n) { .offset = o, .pin_base = p, .num_pins = n }
+
+/*
+ * Pin mapping table for mapping local GPIO pins to Cygnus IOMUX pinctrl pins
+ */
+static const struct cygnus_gpio_pin_range cygnus_gpio_pintable[] = {
+	CYGNUS_PINRANGE(0, 42, 1),
+	CYGNUS_PINRANGE(1, 44, 3),
+	CYGNUS_PINRANGE(4, 48, 1),
+	CYGNUS_PINRANGE(5, 50, 3),
+	CYGNUS_PINRANGE(8, 126, 1),
+	CYGNUS_PINRANGE(9, 155, 1),
+	CYGNUS_PINRANGE(10, 152, 1),
+	CYGNUS_PINRANGE(11, 154, 1),
+	CYGNUS_PINRANGE(12, 153, 1),
+	CYGNUS_PINRANGE(13, 127, 3),
+	CYGNUS_PINRANGE(16, 140, 1),
+	CYGNUS_PINRANGE(17, 145, 7),
+	CYGNUS_PINRANGE(24, 130, 10),
+	CYGNUS_PINRANGE(34, 141, 4),
+	CYGNUS_PINRANGE(38, 54, 1),
+	CYGNUS_PINRANGE(39, 56, 3),
+	CYGNUS_PINRANGE(42, 60, 3),
+	CYGNUS_PINRANGE(45, 64, 3),
+	CYGNUS_PINRANGE(48, 68, 2),
+	CYGNUS_PINRANGE(50, 84, 6),
+	CYGNUS_PINRANGE(56, 94, 6),
+	CYGNUS_PINRANGE(62, 72, 1),
+	CYGNUS_PINRANGE(63, 70, 1),
+	CYGNUS_PINRANGE(64, 80, 1),
+	CYGNUS_PINRANGE(65, 74, 3),
+	CYGNUS_PINRANGE(68, 78, 1),
+	CYGNUS_PINRANGE(69, 82, 1),
+	CYGNUS_PINRANGE(70, 156, 17),
+	CYGNUS_PINRANGE(87, 104, 12),
+	CYGNUS_PINRANGE(99, 102, 2),
+	CYGNUS_PINRANGE(101, 90, 4),
+	CYGNUS_PINRANGE(105, 116, 10),
+	CYGNUS_PINRANGE(123, 11, 1),
+	CYGNUS_PINRANGE(124, 38, 4),
+	CYGNUS_PINRANGE(128, 43, 1),
+	CYGNUS_PINRANGE(129, 47, 1),
+	CYGNUS_PINRANGE(130, 49, 1),
+	CYGNUS_PINRANGE(131, 53, 1),
+	CYGNUS_PINRANGE(132, 55, 1),
+	CYGNUS_PINRANGE(133, 59, 1),
+	CYGNUS_PINRANGE(134, 63, 1),
+	CYGNUS_PINRANGE(135, 67, 1),
+	CYGNUS_PINRANGE(136, 71, 1),
+	CYGNUS_PINRANGE(137, 73, 1),
+	CYGNUS_PINRANGE(138, 77, 1),
+	CYGNUS_PINRANGE(139, 79, 1),
+	CYGNUS_PINRANGE(140, 81, 1),
+	CYGNUS_PINRANGE(141, 83, 1),
+	CYGNUS_PINRANGE(142, 10, 1)
+};
+
+/*
+ * The Cygnus IOMUX controller mainly supports group based mux configuration,
+ * but certain pins can be muxed to GPIO individually. Only the ASIU GPIO
+ * controller can support this, so it's an optional configuration
+ *
+ * Return -ENODEV means no support and that's fine
+ */
+static int cygnus_gpio_pinmux_add_range(struct cygnus_gpio *chip)
+{
+	struct device_node *node = chip->dev->of_node;
+	struct device_node *pinmux_node;
+	struct platform_device *pinmux_pdev;
+	struct gpio_chip *gc = &chip->gc;
+	int i, ret;
+
+	/* parse DT to find the phandle to the pinmux controller */
+	pinmux_node = of_parse_phandle(node, "pinmux", 0);
+	if (!pinmux_node)
+		return -ENODEV;
+
+	pinmux_pdev = of_find_device_by_node(pinmux_node);
+	if (!pinmux_pdev) {
+		dev_err(chip->dev, "failed to get pinmux device\n");
+		return -EINVAL;
+	}
+
+	/* now need to create the mapping between local GPIO and PINMUX pins */
+	for (i = 0; i < ARRAY_SIZE(cygnus_gpio_pintable); i++) {
+		ret = gpiochip_add_pin_range(gc, dev_name(&pinmux_pdev->dev),
+					     cygnus_gpio_pintable[i].offset,
+					     cygnus_gpio_pintable[i].pin_base,
+					     cygnus_gpio_pintable[i].num_pins);
+		if (ret) {
+			dev_err(chip->dev, "unable to add GPIO pin range\n");
+			goto err_rm_pin_range;
+		}
+	}
+
+	chip->pinmux_is_supported = 1;
+	return 0;
+
+err_rm_pin_range:
+	gpiochip_remove_pin_ranges(gc);
+	return ret;
+}
+
+static void cygnus_gpio_pinmux_remove_range(struct cygnus_gpio *chip)
+{
+	struct gpio_chip *gc = &chip->gc;
+
+	if (chip->pinmux_is_supported)
+		gpiochip_remove_pin_ranges(gc);
+}
+
+/*
+ * Cygnus GPIO controller supports some PINCONF related configurations such as
+ * pull up, pull down, and drive strength, when the pin is configured to GPIO
+ *
+ * Here a local pinctrl device is created with simple 1-to-1 pin mapping to the
+ * local GPIO pins
+ */
+static int cygnus_gpio_register_pinconf(struct cygnus_gpio *chip)
+{
+	struct pinctrl_desc *pctldesc = &chip->pctldesc;
+	struct pinctrl_pin_desc *pins;
+	struct gpio_chip *gc = &chip->gc;
+	int i, ret;
+
+	pins = devm_kcalloc(chip->dev, gc->ngpio, sizeof(*pins), GFP_KERNEL);
+	if (!pins)
+		return -ENOMEM;
+	chip->pins = pins;
+
+	for (i = 0; i < gc->ngpio; i++) {
+		pins[i].number = i;
+		pins[i].name = kasprintf(GFP_KERNEL, "gpio-%d", i);
+		if (!pins[i].name) {
+			ret = -ENOMEM;
+			goto err_kfree;
+		}
+	}
+
+	pctldesc->name = dev_name(chip->dev);
+	pctldesc->pctlops = &cygnus_pctrl_ops;
+	pctldesc->pins = pins;
+	pctldesc->npins = gc->ngpio;
+	pctldesc->confops = &cygnus_pconf_ops;
+
+	chip->pctl = pinctrl_register(pctldesc, chip->dev, chip);
+	if (!chip->pctl) {
+		dev_err(chip->dev, "unable to register pinctrl device\n");
+		ret = -EINVAL;
+		goto err_kfree;
+	}
+
+	return 0;
+
+err_kfree:
+	for (i = 0; i < gc->ngpio; i++)
+		kfree(pins[i].name);
+
+	return ret;
+}
+
+static void cygnus_gpio_unregister_pinconf(struct cygnus_gpio *chip)
+{
+	struct gpio_chip *gc = &chip->gc;
+	int i;
+
+	if (chip->pctl)
+		pinctrl_unregister(chip->pctl);
+
+	for (i = 0; i < gc->ngpio; i++)
+		kfree(chip->pins[i].name);
+}
+
+static const struct of_device_id cygnus_gpio_of_match[] = {
+	{ .compatible = "brcm,cygnus-gpio" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, cygnus_gpio_of_match);
+
+static int cygnus_gpio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+	struct cygnus_gpio *chip;
+	struct gpio_chip *gc;
+	u32 ngpios;
+	int irq, ret;
+
+	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
+	chip->dev = dev;
+	platform_set_drvdata(pdev, chip);
+
+	if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
+		dev_err(dev, "missing ngpios DT property\n");
+		return -ENODEV;
+	}
+	chip->num_banks = (ngpios + NGPIOS_PER_BANK - 1) / NGPIOS_PER_BANK;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	chip->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(chip->base)) {
+		dev_err(dev, "unable to map I/O memory\n");
+		return PTR_ERR(chip->base);
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (res) {
+		chip->io_ctrl = devm_ioremap_resource(dev, res);
+		if (IS_ERR(chip->io_ctrl)) {
+			dev_err(dev, "unable to map I/O memory\n");
+			return PTR_ERR(chip->io_ctrl);
+		}
+	}
+
+	spin_lock_init(&chip->lock);
+
+	gc = &chip->gc;
+	gc->base = -1;
+	gc->ngpio = ngpios;
+	gc->label = dev_name(dev);
+	gc->dev = dev;
+	gc->of_node = dev->of_node;
+	gc->request = cygnus_gpio_request;
+	gc->free = cygnus_gpio_free;
+	gc->direction_input = cygnus_gpio_direction_input;
+	gc->direction_output = cygnus_gpio_direction_output;
+	gc->set = cygnus_gpio_set;
+	gc->get = cygnus_gpio_get;
+
+	ret = gpiochip_add(gc);
+	if (ret < 0) {
+		dev_err(dev, "unable to add GPIO chip\n");
+		return ret;
+	}
+
+	ret = cygnus_gpio_pinmux_add_range(chip);
+	if (ret && ret != -ENODEV) {
+		dev_err(dev, "unable to add GPIO pin range\n");
+		goto err_rm_gpiochip;
+	}
+
+	ret = cygnus_gpio_register_pinconf(chip);
+	if (ret) {
+		dev_err(dev, "unable to register pinconf\n");
+		goto err_rm_range;
+	}
+
+	/* optional GPIO interrupt support */
+	irq = platform_get_irq(pdev, 0);
+	if (irq) {
+		ret = gpiochip_irqchip_add(gc, &cygnus_gpio_irq_chip, 0,
+					   handle_simple_irq, IRQ_TYPE_NONE);
+		if (ret) {
+			dev_err(dev, "no GPIO irqchip\n");
+			goto err_unregister_pinconf;
+		}
+
+		gpiochip_set_chained_irqchip(gc, &cygnus_gpio_irq_chip, irq,
+					     cygnus_gpio_irq_handler);
+	}
+
+	return 0;
+
+err_unregister_pinconf:
+	cygnus_gpio_unregister_pinconf(chip);
+
+err_rm_range:
+	cygnus_gpio_pinmux_remove_range(chip);
+
+err_rm_gpiochip:
+	gpiochip_remove(gc);
+
+	return ret;
+}
+
+static struct platform_driver cygnus_gpio_driver = {
+	.driver = {
+		.name = "cygnus-gpio",
+		.of_match_table = cygnus_gpio_of_match,
+	},
+	.probe = cygnus_gpio_probe,
+};
+
+static int __init cygnus_gpio_init(void)
+{
+	return platform_driver_probe(&cygnus_gpio_driver, cygnus_gpio_probe);
+}
+arch_initcall_sync(cygnus_gpio_init);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus GPIO Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v7 2/4] pinctrl: cygnus: add gpio/pinconf driver

[Ray Jui]

This adds the initial support of the Broadcom Cygnus GPIO/PINCONF driver
that supports all 3 GPIO controllers on Cygnus including the ASIU GPIO
controller, the chipCommonG GPIO controller, and the always-on GPIO
controller. Basic PINCONF configurations such as bias pull up/down, and
drive strength are also supported in this driver.

Pins from the ASIU GPIO controller can be individually muxed to GPIO
function, through interaction with the Cygnus IOMUX controller

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/pinctrl/bcm/Kconfig               |   22 +
 drivers/pinctrl/bcm/Makefile              |    1 +
 drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c |  920 +++++++++++++++++++++++++++++
 3 files changed, 943 insertions(+)
 create mode 100644 drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c

diff --git a/drivers/pinctrl/bcm/Kconfig b/drivers/pinctrl/bcm/Kconfig
index eb13201..cd11d4d 100644
--- a/drivers/pinctrl/bcm/Kconfig
+++ b/drivers/pinctrl/bcm/Kconfig
@@ -20,6 +20,28 @@ config PINCTRL_BCM2835
 	select PINMUX
 	select PINCONF
 
+config PINCTRL_CYGNUS_GPIO
+	bool "Broadcom Cygnus GPIO (with PINCONF) driver"
+	depends on OF_GPIO && ARCH_BCM_CYGNUS
+	select GPIOLIB_IRQCHIP
+	select PINCONF
+	select GENERIC_PINCONF
+	default ARCH_BCM_CYGNUS
+	help
+	  Say yes here to enable the Broadcom Cygnus GPIO driver.
+
+	  The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
+	  GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
+	  the always-ON GPIO controller (CRMU/AON). All 3 GPIO controllers are
+	  supported by this driver.
+
+	  All 3 Cygnus GPIO controllers support basic PINCONF functions such
+	  as bias pull up, pull down, and drive strength configurations, when
+	  these pins are muxed to GPIO.
+
+	  Pins from the ASIU GPIO can be individually muxed to GPIO function,
+	  through interaction with the Cygnus IOMUX controller.
+
 config PINCTRL_CYGNUS_MUX
 	bool "Broadcom Cygnus IOMUX driver"
 	depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
diff --git a/drivers/pinctrl/bcm/Makefile b/drivers/pinctrl/bcm/Makefile
index bb6beb6..2b2f70e 100644
--- a/drivers/pinctrl/bcm/Makefile
+++ b/drivers/pinctrl/bcm/Makefile
@@ -2,4 +2,5 @@
 
 obj-$(CONFIG_PINCTRL_BCM281XX)		+= pinctrl-bcm281xx.o
 obj-$(CONFIG_PINCTRL_BCM2835)		+= pinctrl-bcm2835.o
+obj-$(CONFIG_PINCTRL_CYGNUS_GPIO)	+= pinctrl-cygnus-gpio.o
 obj-$(CONFIG_PINCTRL_CYGNUS_MUX)	+= pinctrl-cygnus-mux.o
diff --git a/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c b/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c
new file mode 100644
index 0000000..cfe4478
--- /dev/null
+++ b/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c
@@ -0,0 +1,920 @@
+/*
+ * Copyright (C) 2014-2015 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * This file contains the Broadcom Cygnus GPIO driver that supports 3
+ * GPIO controllers on Cygnus including the ASIU GPIO controller, the
+ * chipCommonG GPIO controller, and the always-on GPIO controller. Basic
+ * PINCONF such as bias pull up/down, and drive strength are also supported
+ * in this driver.
+ *
+ * Pins from the ASIU GPIO can be individually muxed to GPIO function,
+ * through the interaction with the Cygnus IOMUX controller
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/ioport.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+
+#include "../pinctrl-utils.h"
+
+#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
+#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
+#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
+#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
+#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
+#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
+#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
+#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
+#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
+#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
+#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
+#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
+
+/* drive strength control for ASIU GPIO */
+#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
+
+/* drive strength control for CCM/CRMU (AON) GPIO */
+#define CYGNUS_GPIO_DRV0_CTRL_OFFSET  0x00
+
+#define GPIO_BANK_SIZE 0x200
+#define NGPIOS_PER_BANK 32
+#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
+
+#define CYGNUS_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + (reg))
+#define CYGNUS_GPIO_SHIFT(pin) ((pin) % NGPIOS_PER_BANK)
+
+#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
+#define GPIO_DRV_STRENGTH_BITS       3
+#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
+
+/*
+ * Cygnus GPIO core
+ *
+ * @dev: pointer to device
+ * @base: I/O register base for Cygnus GPIO controller
+ * @io_ctrl: I/O register base for certain type of Cygnus GPIO controller that
+ * has the PINCONF support implemented outside of the GPIO block
+ * @lock: lock to protect access to I/O registers
+ * @gc: GPIO chip
+ * @num_banks: number of GPIO banks, each bank supports up to 32 GPIOs
+ * @pinmux_is_supported: flag to indicate this GPIO controller contains pins
+ * that can be individually muxed to GPIO
+ * @pctl: pointer to pinctrl_dev
+ * @pctldesc: pinctrl descriptor
+ * @pins: pointer to array of pins
+ */
+struct cygnus_gpio {
+	struct device *dev;
+
+	void __iomem *base;
+	void __iomem *io_ctrl;
+
+	spinlock_t lock;
+
+	struct gpio_chip gc;
+	unsigned num_banks;
+
+	int pinmux_is_supported;
+
+	struct pinctrl_dev *pctl;
+	struct pinctrl_desc pctldesc;
+	struct pinctrl_pin_desc *pins;
+};
+
+static struct cygnus_gpio *to_cygnus_gpio(struct gpio_chip *gc)
+{
+	return container_of(gc, struct cygnus_gpio, gc);
+}
+
+/*
+ * Mapping from PINCONF pins to GPIO pins is 1-to-1
+ */
+static unsigned cygnus_pin_to_gpio(unsigned pin)
+{
+	return pin;
+}
+
+static u32 cygnus_readl(struct cygnus_gpio *chip, unsigned int offset)
+{
+	return readl(chip->base + offset);
+}
+
+static void cygnus_writel(struct cygnus_gpio *chip, unsigned int offset,
+			  u32 val)
+{
+	writel(val, chip->base + offset);
+}
+
+/**
+ *  cygnus_set_bit - set or clear one bit (corresponding to the GPIO pin) in a
+ *  Cygnus GPIO register
+ *
+ *  @cygnus_gpio: Cygnus GPIO device
+ *  @reg: register offset
+ *  @gpio: GPIO pin
+ *  @set: set or clear. 1 - set; 0 -clear
+ */
+static void cygnus_set_bit(struct cygnus_gpio *chip, unsigned int reg,
+			   unsigned gpio, int set)
+{
+	unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val;
+
+	val = cygnus_readl(chip, offset);
+	if (set)
+		val |= BIT(shift);
+	else
+		val &= ~BIT(shift);
+	cygnus_writel(chip, offset, val);
+}
+
+static int cygnus_get_bit(struct cygnus_gpio *chip, unsigned int reg,
+			  unsigned gpio)
+{
+	unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val;
+
+	val = cygnus_readl(chip, offset) & BIT(shift);
+	if (val)
+		return 1;
+	else
+		return 0;
+}
+
+static void cygnus_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+	struct gpio_chip *gc = irq_desc_get_handler_data(desc);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	struct irq_chip *irq_chip = irq_desc_get_chip(desc);
+	int i, bit;
+
+	chained_irq_enter(irq_chip, desc);
+
+	/* go through the entire GPIO banks and handle all interrupts */
+	for (i = 0; i < chip->num_banks; i++) {
+		unsigned long val = cygnus_readl(chip,
+				(i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_MSTAT_OFFSET);
+
+		for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
+			unsigned pin = NGPIOS_PER_BANK * i + bit;
+			int child_irq = irq_find_mapping(gc->irqdomain, pin);
+
+			/*
+			 * Clear the interrupt before invoking the
+			 * handler, so we do not leave any window
+			 */
+			cygnus_writel(chip, (i * GPIO_BANK_SIZE) +
+				      CYGNUS_GPIO_INT_CLR_OFFSET, BIT(bit));
+
+			generic_handle_irq(child_irq);
+		}
+	}
+
+	chained_irq_exit(irq_chip, desc);
+}
+
+
+static void cygnus_gpio_irq_ack(struct irq_data *d)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned gpio = d->hwirq;
+	unsigned int offset = CYGNUS_GPIO_REG(gpio,
+			CYGNUS_GPIO_INT_CLR_OFFSET);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val = BIT(shift);
+
+	cygnus_writel(chip, offset, val);
+}
+
+/**
+ *  cygnus_gpio_irq_set_mask - mask/unmask a GPIO interrupt
+ *
+ *  @d: IRQ chip data
+ *  @mask: mask/unmask GPIO interrupt. 0 - mask (disable); 1 - unmask (enable)
+ */
+static void cygnus_gpio_irq_set_mask(struct irq_data *d, int mask)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned gpio = d->hwirq;
+
+	cygnus_set_bit(chip, CYGNUS_GPIO_INT_MSK_OFFSET, gpio, mask);
+}
+
+static void cygnus_gpio_irq_mask(struct irq_data *d)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_gpio_irq_set_mask(d, 0);
+	spin_unlock_irqrestore(&chip->lock, flags);
+}
+
+static void cygnus_gpio_irq_unmask(struct irq_data *d)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_gpio_irq_set_mask(d, 1);
+	spin_unlock_irqrestore(&chip->lock, flags);
+}
+
+static int cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned gpio = d->hwirq;
+	int int_type = 0, dual_edge = 0, edge_lvl = 0;
+	unsigned long flags;
+
+	switch (type & IRQ_TYPE_SENSE_MASK) {
+	case IRQ_TYPE_EDGE_RISING:
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_EDGE_FALLING:
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		dual_edge = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_HIGH:
+		int_type = 1;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_LOW:
+		int_type = 1;
+		break;
+
+	default:
+		dev_err(chip->dev, "invalid GPIO IRQ type 0x%x\n",
+			type);
+		return -EINVAL;
+	}
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_set_bit(chip, CYGNUS_GPIO_IN_TYPE_OFFSET, gpio, int_type);
+	cygnus_set_bit(chip, CYGNUS_GPIO_INT_DE_OFFSET, gpio, dual_edge);
+	cygnus_set_bit(chip, CYGNUS_GPIO_INT_EDGE_OFFSET, gpio,
+		       edge_lvl);
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	dev_dbg(chip->dev,
+		"gpio:%u set int_type:%d dual_edge:%d edge_lvl:%d\n",
+		gpio, int_type, dual_edge, edge_lvl);
+
+	return 0;
+}
+
+static struct irq_chip cygnus_gpio_irq_chip = {
+	.name = "bcm-cygnus-gpio",
+	.irq_ack = cygnus_gpio_irq_ack,
+	.irq_mask = cygnus_gpio_irq_mask,
+	.irq_unmask = cygnus_gpio_irq_unmask,
+	.irq_set_type = cygnus_gpio_irq_set_type,
+};
+
+/*
+ * Request the Cygnus IOMUX pinmux controller to mux individual pins to GPIO
+ */
+static int cygnus_gpio_request(struct gpio_chip *gc, unsigned offset)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned gpio = gc->base + offset;
+
+	/* not all Cygnus GPIO pins can be muxed individually */
+	if (!chip->pinmux_is_supported)
+		return 0;
+
+	return pinctrl_request_gpio(gpio);
+}
+
+static void cygnus_gpio_free(struct gpio_chip *gc, unsigned offset)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned gpio = gc->base + offset;
+
+	if (!chip->pinmux_is_supported)
+		return;
+
+	pinctrl_free_gpio(gpio);
+}
+
+static int cygnus_gpio_direction_input(struct gpio_chip *gc, unsigned gpio)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_set_bit(chip, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 0);
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	dev_dbg(chip->dev, "gpio:%u set input\n", gpio);
+
+	return 0;
+}
+
+static int cygnus_gpio_direction_output(struct gpio_chip *gc, unsigned gpio,
+					int value)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_set_bit(chip, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 1);
+	cygnus_set_bit(chip, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	dev_dbg(chip->dev, "gpio:%u set output, value:%d\n", gpio, value);
+
+	return 0;
+}
+
+static void cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio, int value)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_set_bit(chip, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	dev_dbg(chip->dev, "gpio:%u set, value:%d\n", gpio, value);
+}
+
+static int cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned int offset = CYGNUS_GPIO_REG(gpio,
+					      CYGNUS_GPIO_DATA_IN_OFFSET);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+
+	return !!(cygnus_readl(chip, offset) & BIT(shift));
+}
+
+static int cygnus_get_groups_count(struct pinctrl_dev *pctldev)
+{
+	return 1;
+}
+
+/*
+ * Only one group: "gpio_grp", since this local pinctrl device only performs
+ * GPIO specific PINCONF configurations
+ */
+static const char *cygnus_get_group_name(struct pinctrl_dev *pctldev,
+					 unsigned selector)
+{
+
+	return "gpio_grp";
+}
+
+static const struct pinctrl_ops cygnus_pctrl_ops = {
+	.get_groups_count = cygnus_get_groups_count,
+	.get_group_name = cygnus_get_group_name,
+	.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
+	.dt_free_map = pinctrl_utils_dt_free_map,
+};
+
+static int cygnus_gpio_set_pull(struct cygnus_gpio *chip, unsigned gpio,
+				int disable, int pull_up)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+
+	if (disable) {
+		cygnus_set_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio, 0);
+	} else {
+		cygnus_set_bit(chip, CYGNUS_GPIO_PAD_RES_OFFSET, gpio,
+			       pull_up);
+		cygnus_set_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio, 1);
+	}
+
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	dev_dbg(chip->dev, "gpio:%u set pullup:%d\n", gpio, pull_up);
+
+	return 0;
+}
+
+static void cygnus_gpio_get_pull(struct cygnus_gpio *chip, unsigned gpio,
+				 int *disable, int *pull_up)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	*disable = !cygnus_get_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio);
+	*pull_up = cygnus_get_bit(chip, CYGNUS_GPIO_PAD_RES_OFFSET, gpio);
+	spin_unlock_irqrestore(&chip->lock, flags);
+}
+
+static int cygnus_gpio_set_strength(struct cygnus_gpio *chip, unsigned gpio,
+				    unsigned strength)
+{
+	void __iomem *base;
+	unsigned int i, offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	/* make sure drive strength is supported */
+	if (strength < 2 ||  strength > 16 || (strength % 2))
+		return -ENOTSUPP;
+
+	if (chip->io_ctrl) {
+		base = chip->io_ctrl;
+		offset = CYGNUS_GPIO_DRV0_CTRL_OFFSET;
+	} else {
+		base = chip->base;
+		offset = CYGNUS_GPIO_REG(gpio,
+					 CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET);
+	}
+
+	shift = CYGNUS_GPIO_SHIFT(gpio);
+
+	dev_dbg(chip->dev, "gpio:%u set drive strength:%d mA\n", gpio,
+		strength);
+
+	spin_lock_irqsave(&chip->lock, flags);
+	strength = (strength / 2) - 1;
+	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
+		val = readl(base + offset);
+		val &= ~BIT(shift);
+		val |= ((strength >> i) & 0x1) << shift;
+		writel(val, base + offset);
+		offset += 4;
+	}
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	return 0;
+}
+
+static int cygnus_gpio_get_strength(struct cygnus_gpio *chip, unsigned gpio,
+				    u16 *strength)
+{
+	void __iomem *base;
+	unsigned int i, offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	if (chip->io_ctrl) {
+		base = chip->io_ctrl;
+		offset = CYGNUS_GPIO_DRV0_CTRL_OFFSET;
+	} else {
+		base = chip->base;
+		offset = CYGNUS_GPIO_REG(gpio,
+					 CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET);
+	}
+
+	shift = CYGNUS_GPIO_SHIFT(gpio);
+
+	spin_lock_irqsave(&chip->lock, flags);
+	*strength = 0;
+	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
+		val = readl(base + offset) & BIT(shift);
+		val >>= shift;
+		*strength += (val << i);
+		offset += 4;
+	}
+
+	/* convert to mA */
+	*strength = (*strength + 1) * 2;
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	return 0;
+}
+
+static int cygnus_pin_config_get(struct pinctrl_dev *pctldev, unsigned pin,
+				 unsigned long *config)
+{
+	struct cygnus_gpio *chip = pinctrl_dev_get_drvdata(pctldev);
+	enum pin_config_param param = pinconf_to_config_param(*config);
+	unsigned gpio = cygnus_pin_to_gpio(pin);
+	u16 arg;
+	int disable, pull_up, ret;
+
+	switch (param) {
+	case PIN_CONFIG_BIAS_DISABLE:
+		cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
+		if (disable)
+			return 0;
+		else
+			return -EINVAL;
+
+	case PIN_CONFIG_BIAS_PULL_UP:
+		cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
+		if (!disable && pull_up)
+			return 0;
+		else
+			return -EINVAL;
+
+	case PIN_CONFIG_BIAS_PULL_DOWN:
+		cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
+		if (!disable && !pull_up)
+			return 0;
+		else
+			return -EINVAL;
+
+	case PIN_CONFIG_DRIVE_STRENGTH:
+		ret = cygnus_gpio_get_strength(chip, gpio, &arg);
+		if (ret)
+			return ret;
+		else
+			*config = pinconf_to_config_packed(param, arg);
+
+		return 0;
+
+	default:
+		return -ENOTSUPP;
+	}
+
+	return -ENOTSUPP;
+}
+
+static int cygnus_pin_config_set(struct pinctrl_dev *pctldev, unsigned pin,
+				 unsigned long *configs, unsigned num_configs)
+{
+	struct cygnus_gpio *chip = pinctrl_dev_get_drvdata(pctldev);
+	enum pin_config_param param;
+	u16 arg;
+	unsigned i, gpio = cygnus_pin_to_gpio(pin);
+	int ret = -ENOTSUPP;
+
+	for (i = 0; i < num_configs; i++) {
+		param = pinconf_to_config_param(configs[i]);
+		arg = pinconf_to_config_argument(configs[i]);
+
+		switch (param) {
+		case PIN_CONFIG_BIAS_DISABLE:
+			ret = cygnus_gpio_set_pull(chip, gpio, 1, 0);
+			if (ret < 0)
+				goto out;
+			break;
+
+		case PIN_CONFIG_BIAS_PULL_UP:
+			ret = cygnus_gpio_set_pull(chip, gpio, 0, 1);
+			if (ret < 0)
+				goto out;
+			break;
+
+		case PIN_CONFIG_BIAS_PULL_DOWN:
+			ret = cygnus_gpio_set_pull(chip, gpio, 0, 0);
+			if (ret < 0)
+				goto out;
+			break;
+
+		case PIN_CONFIG_DRIVE_STRENGTH:
+			ret = cygnus_gpio_set_strength(chip, gpio, arg);
+			if (ret < 0)
+				goto out;
+			break;
+
+		default:
+			dev_err(chip->dev, "invalid configuration\n");
+			return -ENOTSUPP;
+		}
+	} /* for each config */
+
+out:
+	return ret;
+}
+
+static const struct pinconf_ops cygnus_pconf_ops = {
+	.is_generic = true,
+	.pin_config_get = cygnus_pin_config_get,
+	.pin_config_set = cygnus_pin_config_set,
+};
+
+/*
+ * Map a GPIO in the local gpio_chip pin space to a pin in the Cygnus IOMUX
+ * pinctrl pin space
+ */
+struct cygnus_gpio_pin_range {
+	unsigned offset;
+	unsigned pin_base;
+	unsigned num_pins;
+};
+
+#define CYGNUS_PINRANGE(o, p, n) { .offset = o, .pin_base = p, .num_pins = n }
+
+/*
+ * Pin mapping table for mapping local GPIO pins to Cygnus IOMUX pinctrl pins
+ */
+static const struct cygnus_gpio_pin_range cygnus_gpio_pintable[] = {
+	CYGNUS_PINRANGE(0, 42, 1),
+	CYGNUS_PINRANGE(1, 44, 3),
+	CYGNUS_PINRANGE(4, 48, 1),
+	CYGNUS_PINRANGE(5, 50, 3),
+	CYGNUS_PINRANGE(8, 126, 1),
+	CYGNUS_PINRANGE(9, 155, 1),
+	CYGNUS_PINRANGE(10, 152, 1),
+	CYGNUS_PINRANGE(11, 154, 1),
+	CYGNUS_PINRANGE(12, 153, 1),
+	CYGNUS_PINRANGE(13, 127, 3),
+	CYGNUS_PINRANGE(16, 140, 1),
+	CYGNUS_PINRANGE(17, 145, 7),
+	CYGNUS_PINRANGE(24, 130, 10),
+	CYGNUS_PINRANGE(34, 141, 4),
+	CYGNUS_PINRANGE(38, 54, 1),
+	CYGNUS_PINRANGE(39, 56, 3),
+	CYGNUS_PINRANGE(42, 60, 3),
+	CYGNUS_PINRANGE(45, 64, 3),
+	CYGNUS_PINRANGE(48, 68, 2),
+	CYGNUS_PINRANGE(50, 84, 6),
+	CYGNUS_PINRANGE(56, 94, 6),
+	CYGNUS_PINRANGE(62, 72, 1),
+	CYGNUS_PINRANGE(63, 70, 1),
+	CYGNUS_PINRANGE(64, 80, 1),
+	CYGNUS_PINRANGE(65, 74, 3),
+	CYGNUS_PINRANGE(68, 78, 1),
+	CYGNUS_PINRANGE(69, 82, 1),
+	CYGNUS_PINRANGE(70, 156, 17),
+	CYGNUS_PINRANGE(87, 104, 12),
+	CYGNUS_PINRANGE(99, 102, 2),
+	CYGNUS_PINRANGE(101, 90, 4),
+	CYGNUS_PINRANGE(105, 116, 10),
+	CYGNUS_PINRANGE(123, 11, 1),
+	CYGNUS_PINRANGE(124, 38, 4),
+	CYGNUS_PINRANGE(128, 43, 1),
+	CYGNUS_PINRANGE(129, 47, 1),
+	CYGNUS_PINRANGE(130, 49, 1),
+	CYGNUS_PINRANGE(131, 53, 1),
+	CYGNUS_PINRANGE(132, 55, 1),
+	CYGNUS_PINRANGE(133, 59, 1),
+	CYGNUS_PINRANGE(134, 63, 1),
+	CYGNUS_PINRANGE(135, 67, 1),
+	CYGNUS_PINRANGE(136, 71, 1),
+	CYGNUS_PINRANGE(137, 73, 1),
+	CYGNUS_PINRANGE(138, 77, 1),
+	CYGNUS_PINRANGE(139, 79, 1),
+	CYGNUS_PINRANGE(140, 81, 1),
+	CYGNUS_PINRANGE(141, 83, 1),
+	CYGNUS_PINRANGE(142, 10, 1)
+};
+
+/*
+ * The Cygnus IOMUX controller mainly supports group based mux configuration,
+ * but certain pins can be muxed to GPIO individually. Only the ASIU GPIO
+ * controller can support this, so it's an optional configuration
+ *
+ * Return -ENODEV means no support and that's fine
+ */
+static int cygnus_gpio_pinmux_add_range(struct cygnus_gpio *chip)
+{
+	struct device_node *node = chip->dev->of_node;
+	struct device_node *pinmux_node;
+	struct platform_device *pinmux_pdev;
+	struct gpio_chip *gc = &chip->gc;
+	int i, ret;
+
+	/* parse DT to find the phandle to the pinmux controller */
+	pinmux_node = of_parse_phandle(node, "pinmux", 0);
+	if (!pinmux_node)
+		return -ENODEV;
+
+	pinmux_pdev = of_find_device_by_node(pinmux_node);
+	if (!pinmux_pdev) {
+		dev_err(chip->dev, "failed to get pinmux device\n");
+		return -EINVAL;
+	}
+
+	/* now need to create the mapping between local GPIO and PINMUX pins */
+	for (i = 0; i < ARRAY_SIZE(cygnus_gpio_pintable); i++) {
+		ret = gpiochip_add_pin_range(gc, dev_name(&pinmux_pdev->dev),
+					     cygnus_gpio_pintable[i].offset,
+					     cygnus_gpio_pintable[i].pin_base,
+					     cygnus_gpio_pintable[i].num_pins);
+		if (ret) {
+			dev_err(chip->dev, "unable to add GPIO pin range\n");
+			goto err_rm_pin_range;
+		}
+	}
+
+	chip->pinmux_is_supported = 1;
+	return 0;
+
+err_rm_pin_range:
+	gpiochip_remove_pin_ranges(gc);
+	return ret;
+}
+
+static void cygnus_gpio_pinmux_remove_range(struct cygnus_gpio *chip)
+{
+	struct gpio_chip *gc = &chip->gc;
+
+	if (chip->pinmux_is_supported)
+		gpiochip_remove_pin_ranges(gc);
+}
+
+/*
+ * Cygnus GPIO controller supports some PINCONF related configurations such as
+ * pull up, pull down, and drive strength, when the pin is configured to GPIO
+ *
+ * Here a local pinctrl device is created with simple 1-to-1 pin mapping to the
+ * local GPIO pins
+ */
+static int cygnus_gpio_register_pinconf(struct cygnus_gpio *chip)
+{
+	struct pinctrl_desc *pctldesc = &chip->pctldesc;
+	struct pinctrl_pin_desc *pins;
+	struct gpio_chip *gc = &chip->gc;
+	int i, ret;
+
+	pins = devm_kcalloc(chip->dev, gc->ngpio, sizeof(*pins), GFP_KERNEL);
+	if (!pins)
+		return -ENOMEM;
+	chip->pins = pins;
+
+	for (i = 0; i < gc->ngpio; i++) {
+		pins[i].number = i;
+		pins[i].name = kasprintf(GFP_KERNEL, "gpio-%d", i);
+		if (!pins[i].name) {
+			ret = -ENOMEM;
+			goto err_kfree;
+		}
+	}
+
+	pctldesc->name = dev_name(chip->dev);
+	pctldesc->pctlops = &cygnus_pctrl_ops;
+	pctldesc->pins = pins;
+	pctldesc->npins = gc->ngpio;
+	pctldesc->confops = &cygnus_pconf_ops;
+
+	chip->pctl = pinctrl_register(pctldesc, chip->dev, chip);
+	if (!chip->pctl) {
+		dev_err(chip->dev, "unable to register pinctrl device\n");
+		ret = -EINVAL;
+		goto err_kfree;
+	}
+
+	return 0;
+
+err_kfree:
+	for (i = 0; i < gc->ngpio; i++)
+		kfree(pins[i].name);
+
+	return ret;
+}
+
+static void cygnus_gpio_unregister_pinconf(struct cygnus_gpio *chip)
+{
+	struct gpio_chip *gc = &chip->gc;
+	int i;
+
+	if (chip->pctl)
+		pinctrl_unregister(chip->pctl);
+
+	for (i = 0; i < gc->ngpio; i++)
+		kfree(chip->pins[i].name);
+}
+
+static const struct of_device_id cygnus_gpio_of_match[] = {
+	{ .compatible = "brcm,cygnus-gpio" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, cygnus_gpio_of_match);
+
+static int cygnus_gpio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+	struct cygnus_gpio *chip;
+	struct gpio_chip *gc;
+	u32 ngpios;
+	int irq, ret;
+
+	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
+	chip->dev = dev;
+	platform_set_drvdata(pdev, chip);
+
+	if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
+		dev_err(dev, "missing ngpios DT property\n");
+		return -ENODEV;
+	}
+	chip->num_banks = (ngpios + NGPIOS_PER_BANK - 1) / NGPIOS_PER_BANK;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	chip->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(chip->base)) {
+		dev_err(dev, "unable to map I/O memory\n");
+		return PTR_ERR(chip->base);
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (res) {
+		chip->io_ctrl = devm_ioremap_resource(dev, res);
+		if (IS_ERR(chip->io_ctrl)) {
+			dev_err(dev, "unable to map I/O memory\n");
+			return PTR_ERR(chip->io_ctrl);
+		}
+	}
+
+	spin_lock_init(&chip->lock);
+
+	gc = &chip->gc;
+	gc->base = -1;
+	gc->ngpio = ngpios;
+	gc->label = dev_name(dev);
+	gc->dev = dev;
+	gc->of_node = dev->of_node;
+	gc->request = cygnus_gpio_request;
+	gc->free = cygnus_gpio_free;
+	gc->direction_input = cygnus_gpio_direction_input;
+	gc->direction_output = cygnus_gpio_direction_output;
+	gc->set = cygnus_gpio_set;
+	gc->get = cygnus_gpio_get;
+
+	ret = gpiochip_add(gc);
+	if (ret < 0) {
+		dev_err(dev, "unable to add GPIO chip\n");
+		return ret;
+	}
+
+	ret = cygnus_gpio_pinmux_add_range(chip);
+	if (ret && ret != -ENODEV) {
+		dev_err(dev, "unable to add GPIO pin range\n");
+		goto err_rm_gpiochip;
+	}
+
+	ret = cygnus_gpio_register_pinconf(chip);
+	if (ret) {
+		dev_err(dev, "unable to register pinconf\n");
+		goto err_rm_range;
+	}
+
+	/* optional GPIO interrupt support */
+	irq = platform_get_irq(pdev, 0);
+	if (irq) {
+		ret = gpiochip_irqchip_add(gc, &cygnus_gpio_irq_chip, 0,
+					   handle_simple_irq, IRQ_TYPE_NONE);
+		if (ret) {
+			dev_err(dev, "no GPIO irqchip\n");
+			goto err_unregister_pinconf;
+		}
+
+		gpiochip_set_chained_irqchip(gc, &cygnus_gpio_irq_chip, irq,
+					     cygnus_gpio_irq_handler);
+	}
+
+	return 0;
+
+err_unregister_pinconf:
+	cygnus_gpio_unregister_pinconf(chip);
+
+err_rm_range:
+	cygnus_gpio_pinmux_remove_range(chip);
+
+err_rm_gpiochip:
+	gpiochip_remove(gc);
+
+	return ret;
+}
+
+static struct platform_driver cygnus_gpio_driver = {
+	.driver = {
+		.name = "cygnus-gpio",
+		.of_match_table = cygnus_gpio_of_match,
+	},
+	.probe = cygnus_gpio_probe,
+};
+
+static int __init cygnus_gpio_init(void)
+{
+	return platform_driver_probe(&cygnus_gpio_driver, cygnus_gpio_probe);
+}
+arch_initcall_sync(cygnus_gpio_init);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus GPIO Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v7 3/4] ARM: dts: enable GPIO for Broadcom Cygnus

[Ray Jui]

This enables all 3 GPIO controllers including the ASIU GPIO, the
chipcommonG GPIO, and the ALWAYS-ON GPIO, for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index b014ce5..a3b8621 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -60,6 +60,39 @@
 		      <0x0301d24c 0x2c>;
 	};
 
+	gpio_crmu: gpio@03024800 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x03024800 0x50>,
+		      <0x03024008 0x18>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+	};
+
+	gpio_ccm: gpio@1800a000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x1800a000 0x50>,
+		      <0x0301d164 0x20>;
+		ngpios = <24>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+	};
+
+	gpio_asiu: gpio@180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <146>;
+		#gpio-cells = <2>;
+		gpio-controller;
+
+		pinmux = <&pinctrl>;
+
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

[PATCH v7 3/4] ARM: dts: enable GPIO for Broadcom Cygnus

[Ray Jui]

This enables all 3 GPIO controllers including the ASIU GPIO, the
chipcommonG GPIO, and the ALWAYS-ON GPIO, for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index b014ce5..a3b8621 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -60,6 +60,39 @@
 		      <0x0301d24c 0x2c>;
 	};
 
+	gpio_crmu: gpio@03024800 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x03024800 0x50>,
+		      <0x03024008 0x18>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+	};
+
+	gpio_ccm: gpio@1800a000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x1800a000 0x50>,
+		      <0x0301d164 0x20>;
+		ngpios = <24>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+	};
+
+	gpio_asiu: gpio@180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <146>;
+		#gpio-cells = <2>;
+		gpio-controller;
+
+		pinmux = <&pinctrl>;
+
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

[PATCH v7 3/4] ARM: dts: enable GPIO for Broadcom Cygnus

[Ray Jui]

This enables all 3 GPIO controllers including the ASIU GPIO, the
chipcommonG GPIO, and the ALWAYS-ON GPIO, for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index b014ce5..a3b8621 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -60,6 +60,39 @@
 		      <0x0301d24c 0x2c>;
 	};
 
+	gpio_crmu: gpio at 03024800 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x03024800 0x50>,
+		      <0x03024008 0x18>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+	};
+
+	gpio_ccm: gpio at 1800a000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x1800a000 0x50>,
+		      <0x0301d164 0x20>;
+		ngpios = <24>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+	};
+
+	gpio_asiu: gpio at 180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <146>;
+		#gpio-cells = <2>;
+		gpio-controller;
+
+		pinmux = <&pinctrl>;
+
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

[PATCH v7 4/4] ARM: dts: cygnus: enable GPIO based hook detection

[Ray Jui]

This enables GPIO based phone hook detection for Broadcom BCM911360
phone factor board (bcm911360_entphn)

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 arch/arm/boot/dts/bcm911360_entphn.dts |   13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/arm/boot/dts/bcm911360_entphn.dts b/arch/arm/boot/dts/bcm911360_entphn.dts
index d2ee952..7db4843 100644
--- a/arch/arm/boot/dts/bcm911360_entphn.dts
+++ b/arch/arm/boot/dts/bcm911360_entphn.dts
@@ -33,6 +33,7 @@
 /dts-v1/;
 
 #include "bcm-cygnus.dtsi"
+#include "dt-bindings/input/input.h"
 
 / {
 	model = "Cygnus Enterprise Phone (BCM911360_ENTPHN)";
@@ -50,4 +51,16 @@
 	uart3: serial@18023000 {
 		status = "okay";
 	};
+
+	gpio_keys {
+		compatible = "gpio-keys";
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		hook {
+			label = "HOOK";
+			linux,code = <KEY_O>;
+			gpios = <&gpio_asiu 48 0>;
+		};
+	};
 };
-- 
1.7.9.5

[PATCH v7 4/4] ARM: dts: cygnus: enable GPIO based hook detection

[Ray Jui]

This enables GPIO based phone hook detection for Broadcom BCM911360
phone factor board (bcm911360_entphn)

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 arch/arm/boot/dts/bcm911360_entphn.dts |   13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/arm/boot/dts/bcm911360_entphn.dts b/arch/arm/boot/dts/bcm911360_entphn.dts
index d2ee952..7db4843 100644
--- a/arch/arm/boot/dts/bcm911360_entphn.dts
+++ b/arch/arm/boot/dts/bcm911360_entphn.dts
@@ -33,6 +33,7 @@
 /dts-v1/;
 
 #include "bcm-cygnus.dtsi"
+#include "dt-bindings/input/input.h"
 
 / {
 	model = "Cygnus Enterprise Phone (BCM911360_ENTPHN)";
@@ -50,4 +51,16 @@
 	uart3: serial@18023000 {
 		status = "okay";
 	};
+
+	gpio_keys {
+		compatible = "gpio-keys";
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		hook {
+			label = "HOOK";
+			linux,code = <KEY_O>;
+			gpios = <&gpio_asiu 48 0>;
+		};
+	};
 };
-- 
1.7.9.5

[PATCH v7 4/4] ARM: dts: cygnus: enable GPIO based hook detection

[Ray Jui]

This enables GPIO based phone hook detection for Broadcom BCM911360
phone factor board (bcm911360_entphn)

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 arch/arm/boot/dts/bcm911360_entphn.dts |   13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/arm/boot/dts/bcm911360_entphn.dts b/arch/arm/boot/dts/bcm911360_entphn.dts
index d2ee952..7db4843 100644
--- a/arch/arm/boot/dts/bcm911360_entphn.dts
+++ b/arch/arm/boot/dts/bcm911360_entphn.dts
@@ -33,6 +33,7 @@
 /dts-v1/;
 
 #include "bcm-cygnus.dtsi"
+#include "dt-bindings/input/input.h"
 
 / {
 	model = "Cygnus Enterprise Phone (BCM911360_ENTPHN)";
@@ -50,4 +51,16 @@
 	uart3: serial at 18023000 {
 		status = "okay";
 	};
+
+	gpio_keys {
+		compatible = "gpio-keys";
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		hook {
+			label = "HOOK";
+			linux,code = <KEY_O>;
+			gpios = <&gpio_asiu 48 0>;
+		};
+	};
 };
-- 
1.7.9.5

Re: [PATCH v7 2/4] pinctrl: cygnus: add gpio/pinconf driver

[Dmitry Torokhov]

On Tue, Feb 03, 2015 at 05:09:06PM -0800, Ray Jui wrote:
> This adds the initial support of the Broadcom Cygnus GPIO/PINCONF driver
> that supports all 3 GPIO controllers on Cygnus including the ASIU GPIO
> controller, the chipCommonG GPIO controller, and the always-on GPIO
> controller. Basic PINCONF configurations such as bias pull up/down, and
> drive strength are also supported in this driver.
> 
> Pins from the ASIU GPIO controller can be individually muxed to GPIO
> function, through interaction with the Cygnus IOMUX controller
> 
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> ---
>  drivers/pinctrl/bcm/Kconfig               |   22 +
>  drivers/pinctrl/bcm/Makefile              |    1 +
>  drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c |  920 +++++++++++++++++++++++++++++
>  3 files changed, 943 insertions(+)
>  create mode 100644 drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c
> 
> diff --git a/drivers/pinctrl/bcm/Kconfig b/drivers/pinctrl/bcm/Kconfig
> index eb13201..cd11d4d 100644
> --- a/drivers/pinctrl/bcm/Kconfig
> +++ b/drivers/pinctrl/bcm/Kconfig
> @@ -20,6 +20,28 @@ config PINCTRL_BCM2835
>  	select PINMUX
>  	select PINCONF
>  
> +config PINCTRL_CYGNUS_GPIO
> +	bool "Broadcom Cygnus GPIO (with PINCONF) driver"
> +	depends on OF_GPIO && ARCH_BCM_CYGNUS
> +	select GPIOLIB_IRQCHIP
> +	select PINCONF
> +	select GENERIC_PINCONF
> +	default ARCH_BCM_CYGNUS
> +	help
> +	  Say yes here to enable the Broadcom Cygnus GPIO driver.
> +
> +	  The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
> +	  GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
> +	  the always-ON GPIO controller (CRMU/AON). All 3 GPIO controllers are
> +	  supported by this driver.
> +
> +	  All 3 Cygnus GPIO controllers support basic PINCONF functions such
> +	  as bias pull up, pull down, and drive strength configurations, when
> +	  these pins are muxed to GPIO.
> +
> +	  Pins from the ASIU GPIO can be individually muxed to GPIO function,
> +	  through interaction with the Cygnus IOMUX controller.
> +
>  config PINCTRL_CYGNUS_MUX
>  	bool "Broadcom Cygnus IOMUX driver"
>  	depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
> diff --git a/drivers/pinctrl/bcm/Makefile b/drivers/pinctrl/bcm/Makefile
> index bb6beb6..2b2f70e 100644
> --- a/drivers/pinctrl/bcm/Makefile
> +++ b/drivers/pinctrl/bcm/Makefile
> @@ -2,4 +2,5 @@
>  
>  obj-$(CONFIG_PINCTRL_BCM281XX)		+= pinctrl-bcm281xx.o
>  obj-$(CONFIG_PINCTRL_BCM2835)		+= pinctrl-bcm2835.o
> +obj-$(CONFIG_PINCTRL_CYGNUS_GPIO)	+= pinctrl-cygnus-gpio.o
>  obj-$(CONFIG_PINCTRL_CYGNUS_MUX)	+= pinctrl-cygnus-mux.o
> diff --git a/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c b/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c
> new file mode 100644
> index 0000000..cfe4478
> --- /dev/null
> +++ b/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c
> @@ -0,0 +1,920 @@
> +/*
> + * Copyright (C) 2014-2015 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * This file contains the Broadcom Cygnus GPIO driver that supports 3
> + * GPIO controllers on Cygnus including the ASIU GPIO controller, the
> + * chipCommonG GPIO controller, and the always-on GPIO controller. Basic
> + * PINCONF such as bias pull up/down, and drive strength are also supported
> + * in this driver.
> + *
> + * Pins from the ASIU GPIO can be individually muxed to GPIO function,
> + * through the interaction with the Cygnus IOMUX controller
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/slab.h>
> +#include <linux/module.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/gpio.h>
> +#include <linux/ioport.h>
> +#include <linux/of_device.h>
> +#include <linux/of_irq.h>
> +#include <linux/pinctrl/pinctrl.h>
> +#include <linux/pinctrl/pinmux.h>
> +#include <linux/pinctrl/pinconf.h>
> +#include <linux/pinctrl/pinconf-generic.h>
> +
> +#include "../pinctrl-utils.h"
> +
> +#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
> +#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
> +#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
> +#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
> +#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
> +#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
> +#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
> +#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
> +#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
> +#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
> +#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
> +#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
> +
> +/* drive strength control for ASIU GPIO */
> +#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
> +
> +/* drive strength control for CCM/CRMU (AON) GPIO */
> +#define CYGNUS_GPIO_DRV0_CTRL_OFFSET  0x00
> +
> +#define GPIO_BANK_SIZE 0x200
> +#define NGPIOS_PER_BANK 32
> +#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
> +
> +#define CYGNUS_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + (reg))
> +#define CYGNUS_GPIO_SHIFT(pin) ((pin) % NGPIOS_PER_BANK)
> +
> +#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
> +#define GPIO_DRV_STRENGTH_BITS       3
> +#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
> +
> +/*
> + * Cygnus GPIO core
> + *
> + * @dev: pointer to device
> + * @base: I/O register base for Cygnus GPIO controller
> + * @io_ctrl: I/O register base for certain type of Cygnus GPIO controller that
> + * has the PINCONF support implemented outside of the GPIO block
> + * @lock: lock to protect access to I/O registers
> + * @gc: GPIO chip
> + * @num_banks: number of GPIO banks, each bank supports up to 32 GPIOs
> + * @pinmux_is_supported: flag to indicate this GPIO controller contains pins
> + * that can be individually muxed to GPIO
> + * @pctl: pointer to pinctrl_dev
> + * @pctldesc: pinctrl descriptor
> + * @pins: pointer to array of pins
> + */
> +struct cygnus_gpio {
> +	struct device *dev;
> +
> +	void __iomem *base;
> +	void __iomem *io_ctrl;
> +
> +	spinlock_t lock;
> +
> +	struct gpio_chip gc;
> +	unsigned num_banks;
> +
> +	int pinmux_is_supported;

bool?

> +
> +	struct pinctrl_dev *pctl;
> +	struct pinctrl_desc pctldesc;
> +	struct pinctrl_pin_desc *pins;
> +};
> +
> +static struct cygnus_gpio *to_cygnus_gpio(struct gpio_chip *gc)
> +{
> +	return container_of(gc, struct cygnus_gpio, gc);
> +}
> +
> +/*
> + * Mapping from PINCONF pins to GPIO pins is 1-to-1
> + */
> +static unsigned cygnus_pin_to_gpio(unsigned pin)
> +{
> +	return pin;
> +}
> +
> +static u32 cygnus_readl(struct cygnus_gpio *chip, unsigned int offset)
> +{
> +	return readl(chip->base + offset);
> +}
> +
> +static void cygnus_writel(struct cygnus_gpio *chip, unsigned int offset,
> +			  u32 val)
> +{
> +	writel(val, chip->base + offset);
> +}
> +
> +/**
> + *  cygnus_set_bit - set or clear one bit (corresponding to the GPIO pin) in a
> + *  Cygnus GPIO register
> + *
> + *  @cygnus_gpio: Cygnus GPIO device
> + *  @reg: register offset
> + *  @gpio: GPIO pin
> + *  @set: set or clear. 1 - set; 0 -clear
> + */
> +static void cygnus_set_bit(struct cygnus_gpio *chip, unsigned int reg,
> +			   unsigned gpio, int set)
> +{
> +	unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
> +	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
> +	u32 val;
> +
> +	val = cygnus_readl(chip, offset);
> +	if (set)
> +		val |= BIT(shift);
> +	else
> +		val &= ~BIT(shift);
> +	cygnus_writel(chip, offset, val);
> +}
> +
> +static int cygnus_get_bit(struct cygnus_gpio *chip, unsigned int reg,
> +			  unsigned gpio)
> +{
> +	unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
> +	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
> +	u32 val;
> +
> +	val = cygnus_readl(chip, offset) & BIT(shift);
> +	if (val)
> +		return 1;
> +	else
> +		return 0;
> +}
> +
> +static void cygnus_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
> +{
> +	struct gpio_chip *gc = irq_desc_get_handler_data(desc);
> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
> +	struct irq_chip *irq_chip = irq_desc_get_chip(desc);
> +	int i, bit;
> +
> +	chained_irq_enter(irq_chip, desc);
> +
> +	/* go through the entire GPIO banks and handle all interrupts */
> +	for (i = 0; i < chip->num_banks; i++) {
> +		unsigned long val = cygnus_readl(chip,
> +				(i * GPIO_BANK_SIZE) +
> +				CYGNUS_GPIO_INT_MSTAT_OFFSET);
> +
> +		for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
> +			unsigned pin = NGPIOS_PER_BANK * i + bit;
> +			int child_irq = irq_find_mapping(gc->irqdomain, pin);
> +
> +			/*
> +			 * Clear the interrupt before invoking the
> +			 * handler, so we do not leave any window
> +			 */
> +			cygnus_writel(chip, (i * GPIO_BANK_SIZE) +
> +				      CYGNUS_GPIO_INT_CLR_OFFSET, BIT(bit));
> +
> +			generic_handle_irq(child_irq);
> +		}
> +	}
> +
> +	chained_irq_exit(irq_chip, desc);
> +}
> +
> +
> +static void cygnus_gpio_irq_ack(struct irq_data *d)
> +{
> +	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
> +	unsigned gpio = d->hwirq;
> +	unsigned int offset = CYGNUS_GPIO_REG(gpio,
> +			CYGNUS_GPIO_INT_CLR_OFFSET);
> +	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
> +	u32 val = BIT(shift);
> +
> +	cygnus_writel(chip, offset, val);
> +}
> +
> +/**
> + *  cygnus_gpio_irq_set_mask - mask/unmask a GPIO interrupt
> + *
> + *  @d: IRQ chip data
> + *  @mask: mask/unmask GPIO interrupt. 0 - mask (disable); 1 - unmask (enable)
> + */
> +static void cygnus_gpio_irq_set_mask(struct irq_data *d, int mask)
> +{
> +	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
> +	unsigned gpio = d->hwirq;
> +
> +	cygnus_set_bit(chip, CYGNUS_GPIO_INT_MSK_OFFSET, gpio, mask);
> +}
> +
> +static void cygnus_gpio_irq_mask(struct irq_data *d)
> +{
> +	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&chip->lock, flags);
> +	cygnus_gpio_irq_set_mask(d, 0);
> +	spin_unlock_irqrestore(&chip->lock, flags);
> +}
> +
> +static void cygnus_gpio_irq_unmask(struct irq_data *d)
> +{
> +	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&chip->lock, flags);
> +	cygnus_gpio_irq_set_mask(d, 1);
> +	spin_unlock_irqrestore(&chip->lock, flags);
> +}
> +
> +static int cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
> +{
> +	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
> +	unsigned gpio = d->hwirq;
> +	int int_type = 0, dual_edge = 0, edge_lvl = 0;
> +	unsigned long flags;
> +
> +	switch (type & IRQ_TYPE_SENSE_MASK) {
> +	case IRQ_TYPE_EDGE_RISING:
> +		edge_lvl = 1;
> +		break;
> +
> +	case IRQ_TYPE_EDGE_FALLING:
> +		break;
> +
> +	case IRQ_TYPE_EDGE_BOTH:
> +		dual_edge = 1;
> +		break;
> +
> +	case IRQ_TYPE_LEVEL_HIGH:
> +		int_type = 1;
> +		edge_lvl = 1;
> +		break;
> +
> +	case IRQ_TYPE_LEVEL_LOW:
> +		int_type = 1;
> +		break;
> +
> +	default:
> +		dev_err(chip->dev, "invalid GPIO IRQ type 0x%x\n",
> +			type);
> +		return -EINVAL;
> +	}
> +
> +	spin_lock_irqsave(&chip->lock, flags);
> +	cygnus_set_bit(chip, CYGNUS_GPIO_IN_TYPE_OFFSET, gpio, int_type);
> +	cygnus_set_bit(chip, CYGNUS_GPIO_INT_DE_OFFSET, gpio, dual_edge);
> +	cygnus_set_bit(chip, CYGNUS_GPIO_INT_EDGE_OFFSET, gpio,
> +		       edge_lvl);
> +	spin_unlock_irqrestore(&chip->lock, flags);
> +
> +	dev_dbg(chip->dev,
> +		"gpio:%u set int_type:%d dual_edge:%d edge_lvl:%d\n",
> +		gpio, int_type, dual_edge, edge_lvl);
> +
> +	return 0;
> +}
> +
> +static struct irq_chip cygnus_gpio_irq_chip = {
> +	.name = "bcm-cygnus-gpio",
> +	.irq_ack = cygnus_gpio_irq_ack,
> +	.irq_mask = cygnus_gpio_irq_mask,
> +	.irq_unmask = cygnus_gpio_irq_unmask,
> +	.irq_set_type = cygnus_gpio_irq_set_type,
> +};
> +
> +/*
> + * Request the Cygnus IOMUX pinmux controller to mux individual pins to GPIO
> + */
> +static int cygnus_gpio_request(struct gpio_chip *gc, unsigned offset)
> +{
> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
> +	unsigned gpio = gc->base + offset;
> +
> +	/* not all Cygnus GPIO pins can be muxed individually */
> +	if (!chip->pinmux_is_supported)
> +		return 0;
> +
> +	return pinctrl_request_gpio(gpio);
> +}
> +
> +static void cygnus_gpio_free(struct gpio_chip *gc, unsigned offset)
> +{
> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
> +	unsigned gpio = gc->base + offset;
> +
> +	if (!chip->pinmux_is_supported)
> +		return;
> +
> +	pinctrl_free_gpio(gpio);
> +}
> +
> +static int cygnus_gpio_direction_input(struct gpio_chip *gc, unsigned gpio)
> +{
> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&chip->lock, flags);
> +	cygnus_set_bit(chip, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 0);
> +	spin_unlock_irqrestore(&chip->lock, flags);
> +
> +	dev_dbg(chip->dev, "gpio:%u set input\n", gpio);
> +
> +	return 0;
> +}
> +
> +static int cygnus_gpio_direction_output(struct gpio_chip *gc, unsigned gpio,
> +					int value)
> +{
> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&chip->lock, flags);
> +	cygnus_set_bit(chip, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 1);
> +	cygnus_set_bit(chip, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
> +	spin_unlock_irqrestore(&chip->lock, flags);
> +
> +	dev_dbg(chip->dev, "gpio:%u set output, value:%d\n", gpio, value);
> +
> +	return 0;
> +}
> +
> +static void cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio, int value)
> +{
> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&chip->lock, flags);
> +	cygnus_set_bit(chip, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
> +	spin_unlock_irqrestore(&chip->lock, flags);
> +
> +	dev_dbg(chip->dev, "gpio:%u set, value:%d\n", gpio, value);
> +}
> +
> +static int cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
> +{
> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
> +	unsigned int offset = CYGNUS_GPIO_REG(gpio,
> +					      CYGNUS_GPIO_DATA_IN_OFFSET);
> +	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
> +
> +	return !!(cygnus_readl(chip, offset) & BIT(shift));
> +}
> +
> +static int cygnus_get_groups_count(struct pinctrl_dev *pctldev)
> +{
> +	return 1;
> +}
> +
> +/*
> + * Only one group: "gpio_grp", since this local pinctrl device only performs
> + * GPIO specific PINCONF configurations
> + */
> +static const char *cygnus_get_group_name(struct pinctrl_dev *pctldev,
> +					 unsigned selector)
> +{
> +

Extra blank line.

> +	return "gpio_grp";
> +}
> +
> +static const struct pinctrl_ops cygnus_pctrl_ops = {
> +	.get_groups_count = cygnus_get_groups_count,
> +	.get_group_name = cygnus_get_group_name,
> +	.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
> +	.dt_free_map = pinctrl_utils_dt_free_map,
> +};
> +
> +static int cygnus_gpio_set_pull(struct cygnus_gpio *chip, unsigned gpio,
> +				int disable, int pull_up)
> +{
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&chip->lock, flags);
> +
> +	if (disable) {
> +		cygnus_set_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio, 0);
> +	} else {
> +		cygnus_set_bit(chip, CYGNUS_GPIO_PAD_RES_OFFSET, gpio,
> +			       pull_up);
> +		cygnus_set_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio, 1);
> +	}
> +
> +	spin_unlock_irqrestore(&chip->lock, flags);
> +
> +	dev_dbg(chip->dev, "gpio:%u set pullup:%d\n", gpio, pull_up);
> +
> +	return 0;
> +}
> +
> +static void cygnus_gpio_get_pull(struct cygnus_gpio *chip, unsigned gpio,
> +				 int *disable, int *pull_up)
> +{
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&chip->lock, flags);
> +	*disable = !cygnus_get_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio);
> +	*pull_up = cygnus_get_bit(chip, CYGNUS_GPIO_PAD_RES_OFFSET, gpio);
> +	spin_unlock_irqrestore(&chip->lock, flags);
> +}
> +
> +static int cygnus_gpio_set_strength(struct cygnus_gpio *chip, unsigned gpio,
> +				    unsigned strength)
> +{
> +	void __iomem *base;
> +	unsigned int i, offset, shift;
> +	u32 val;
> +	unsigned long flags;
> +
> +	/* make sure drive strength is supported */
> +	if (strength < 2 ||  strength > 16 || (strength % 2))
> +		return -ENOTSUPP;
> +
> +	if (chip->io_ctrl) {
> +		base = chip->io_ctrl;
> +		offset = CYGNUS_GPIO_DRV0_CTRL_OFFSET;
> +	} else {
> +		base = chip->base;
> +		offset = CYGNUS_GPIO_REG(gpio,
> +					 CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET);
> +	}
> +
> +	shift = CYGNUS_GPIO_SHIFT(gpio);
> +
> +	dev_dbg(chip->dev, "gpio:%u set drive strength:%d mA\n", gpio,
> +		strength);
> +
> +	spin_lock_irqsave(&chip->lock, flags);
> +	strength = (strength / 2) - 1;
> +	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
> +		val = readl(base + offset);
> +		val &= ~BIT(shift);
> +		val |= ((strength >> i) & 0x1) << shift;
> +		writel(val, base + offset);
> +		offset += 4;
> +	}
> +	spin_unlock_irqrestore(&chip->lock, flags);
> +
> +	return 0;
> +}
> +
> +static int cygnus_gpio_get_strength(struct cygnus_gpio *chip, unsigned gpio,
> +				    u16 *strength)
> +{
> +	void __iomem *base;
> +	unsigned int i, offset, shift;
> +	u32 val;
> +	unsigned long flags;
> +
> +	if (chip->io_ctrl) {
> +		base = chip->io_ctrl;
> +		offset = CYGNUS_GPIO_DRV0_CTRL_OFFSET;
> +	} else {
> +		base = chip->base;
> +		offset = CYGNUS_GPIO_REG(gpio,
> +					 CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET);
> +	}
> +
> +	shift = CYGNUS_GPIO_SHIFT(gpio);
> +
> +	spin_lock_irqsave(&chip->lock, flags);
> +	*strength = 0;
> +	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
> +		val = readl(base + offset) & BIT(shift);
> +		val >>= shift;
> +		*strength += (val << i);
> +		offset += 4;
> +	}
> +
> +	/* convert to mA */
> +	*strength = (*strength + 1) * 2;
> +	spin_unlock_irqrestore(&chip->lock, flags);
> +
> +	return 0;
> +}
> +
> +static int cygnus_pin_config_get(struct pinctrl_dev *pctldev, unsigned pin,
> +				 unsigned long *config)
> +{
> +	struct cygnus_gpio *chip = pinctrl_dev_get_drvdata(pctldev);
> +	enum pin_config_param param = pinconf_to_config_param(*config);
> +	unsigned gpio = cygnus_pin_to_gpio(pin);
> +	u16 arg;
> +	int disable, pull_up, ret;
> +
> +	switch (param) {
> +	case PIN_CONFIG_BIAS_DISABLE:
> +		cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
> +		if (disable)
> +			return 0;
> +		else
> +			return -EINVAL;
> +
> +	case PIN_CONFIG_BIAS_PULL_UP:
> +		cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
> +		if (!disable && pull_up)
> +			return 0;
> +		else
> +			return -EINVAL;
> +
> +	case PIN_CONFIG_BIAS_PULL_DOWN:
> +		cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
> +		if (!disable && !pull_up)
> +			return 0;
> +		else
> +			return -EINVAL;
> +
> +	case PIN_CONFIG_DRIVE_STRENGTH:
> +		ret = cygnus_gpio_get_strength(chip, gpio, &arg);
> +		if (ret)
> +			return ret;
> +		else
> +			*config = pinconf_to_config_packed(param, arg);
> +
> +		return 0;
> +
> +	default:
> +		return -ENOTSUPP;
> +	}
> +
> +	return -ENOTSUPP;
> +}
> +
> +static int cygnus_pin_config_set(struct pinctrl_dev *pctldev, unsigned pin,
> +				 unsigned long *configs, unsigned num_configs)
> +{
> +	struct cygnus_gpio *chip = pinctrl_dev_get_drvdata(pctldev);
> +	enum pin_config_param param;
> +	u16 arg;
> +	unsigned i, gpio = cygnus_pin_to_gpio(pin);
> +	int ret = -ENOTSUPP;
> +
> +	for (i = 0; i < num_configs; i++) {
> +		param = pinconf_to_config_param(configs[i]);
> +		arg = pinconf_to_config_argument(configs[i]);
> +
> +		switch (param) {
> +		case PIN_CONFIG_BIAS_DISABLE:
> +			ret = cygnus_gpio_set_pull(chip, gpio, 1, 0);
> +			if (ret < 0)
> +				goto out;
> +			break;
> +
> +		case PIN_CONFIG_BIAS_PULL_UP:
> +			ret = cygnus_gpio_set_pull(chip, gpio, 0, 1);
> +			if (ret < 0)
> +				goto out;
> +			break;
> +
> +		case PIN_CONFIG_BIAS_PULL_DOWN:
> +			ret = cygnus_gpio_set_pull(chip, gpio, 0, 0);
> +			if (ret < 0)
> +				goto out;
> +			break;
> +
> +		case PIN_CONFIG_DRIVE_STRENGTH:
> +			ret = cygnus_gpio_set_strength(chip, gpio, arg);
> +			if (ret < 0)
> +				goto out;
> +			break;
> +
> +		default:
> +			dev_err(chip->dev, "invalid configuration\n");
> +			return -ENOTSUPP;
> +		}
> +	} /* for each config */
> +
> +out:
> +	return ret;
> +}
> +
> +static const struct pinconf_ops cygnus_pconf_ops = {
> +	.is_generic = true,
> +	.pin_config_get = cygnus_pin_config_get,
> +	.pin_config_set = cygnus_pin_config_set,
> +};
> +
> +/*
> + * Map a GPIO in the local gpio_chip pin space to a pin in the Cygnus IOMUX
> + * pinctrl pin space
> + */
> +struct cygnus_gpio_pin_range {
> +	unsigned offset;
> +	unsigned pin_base;
> +	unsigned num_pins;
> +};
> +
> +#define CYGNUS_PINRANGE(o, p, n) { .offset = o, .pin_base = p, .num_pins = n }
> +
> +/*
> + * Pin mapping table for mapping local GPIO pins to Cygnus IOMUX pinctrl pins
> + */
> +static const struct cygnus_gpio_pin_range cygnus_gpio_pintable[] = {
> +	CYGNUS_PINRANGE(0, 42, 1),
> +	CYGNUS_PINRANGE(1, 44, 3),
> +	CYGNUS_PINRANGE(4, 48, 1),
> +	CYGNUS_PINRANGE(5, 50, 3),
> +	CYGNUS_PINRANGE(8, 126, 1),
> +	CYGNUS_PINRANGE(9, 155, 1),
> +	CYGNUS_PINRANGE(10, 152, 1),
> +	CYGNUS_PINRANGE(11, 154, 1),
> +	CYGNUS_PINRANGE(12, 153, 1),
> +	CYGNUS_PINRANGE(13, 127, 3),
> +	CYGNUS_PINRANGE(16, 140, 1),
> +	CYGNUS_PINRANGE(17, 145, 7),
> +	CYGNUS_PINRANGE(24, 130, 10),
> +	CYGNUS_PINRANGE(34, 141, 4),
> +	CYGNUS_PINRANGE(38, 54, 1),
> +	CYGNUS_PINRANGE(39, 56, 3),
> +	CYGNUS_PINRANGE(42, 60, 3),
> +	CYGNUS_PINRANGE(45, 64, 3),
> +	CYGNUS_PINRANGE(48, 68, 2),
> +	CYGNUS_PINRANGE(50, 84, 6),
> +	CYGNUS_PINRANGE(56, 94, 6),
> +	CYGNUS_PINRANGE(62, 72, 1),
> +	CYGNUS_PINRANGE(63, 70, 1),
> +	CYGNUS_PINRANGE(64, 80, 1),
> +	CYGNUS_PINRANGE(65, 74, 3),
> +	CYGNUS_PINRANGE(68, 78, 1),
> +	CYGNUS_PINRANGE(69, 82, 1),
> +	CYGNUS_PINRANGE(70, 156, 17),
> +	CYGNUS_PINRANGE(87, 104, 12),
> +	CYGNUS_PINRANGE(99, 102, 2),
> +	CYGNUS_PINRANGE(101, 90, 4),
> +	CYGNUS_PINRANGE(105, 116, 10),
> +	CYGNUS_PINRANGE(123, 11, 1),
> +	CYGNUS_PINRANGE(124, 38, 4),
> +	CYGNUS_PINRANGE(128, 43, 1),
> +	CYGNUS_PINRANGE(129, 47, 1),
> +	CYGNUS_PINRANGE(130, 49, 1),
> +	CYGNUS_PINRANGE(131, 53, 1),
> +	CYGNUS_PINRANGE(132, 55, 1),
> +	CYGNUS_PINRANGE(133, 59, 1),
> +	CYGNUS_PINRANGE(134, 63, 1),
> +	CYGNUS_PINRANGE(135, 67, 1),
> +	CYGNUS_PINRANGE(136, 71, 1),
> +	CYGNUS_PINRANGE(137, 73, 1),
> +	CYGNUS_PINRANGE(138, 77, 1),
> +	CYGNUS_PINRANGE(139, 79, 1),
> +	CYGNUS_PINRANGE(140, 81, 1),
> +	CYGNUS_PINRANGE(141, 83, 1),
> +	CYGNUS_PINRANGE(142, 10, 1)
> +};
> +
> +/*
> + * The Cygnus IOMUX controller mainly supports group based mux configuration,
> + * but certain pins can be muxed to GPIO individually. Only the ASIU GPIO
> + * controller can support this, so it's an optional configuration
> + *
> + * Return -ENODEV means no support and that's fine
> + */
> +static int cygnus_gpio_pinmux_add_range(struct cygnus_gpio *chip)
> +{
> +	struct device_node *node = chip->dev->of_node;
> +	struct device_node *pinmux_node;
> +	struct platform_device *pinmux_pdev;
> +	struct gpio_chip *gc = &chip->gc;
> +	int i, ret;
> +
> +	/* parse DT to find the phandle to the pinmux controller */
> +	pinmux_node = of_parse_phandle(node, "pinmux", 0);
> +	if (!pinmux_node)
> +		return -ENODEV;
> +
> +	pinmux_pdev = of_find_device_by_node(pinmux_node);
> +	if (!pinmux_pdev) {
> +		dev_err(chip->dev, "failed to get pinmux device\n");
> +		return -EINVAL;
> +	}
> +
> +	/* now need to create the mapping between local GPIO and PINMUX pins */
> +	for (i = 0; i < ARRAY_SIZE(cygnus_gpio_pintable); i++) {
> +		ret = gpiochip_add_pin_range(gc, dev_name(&pinmux_pdev->dev),
> +					     cygnus_gpio_pintable[i].offset,
> +					     cygnus_gpio_pintable[i].pin_base,
> +					     cygnus_gpio_pintable[i].num_pins);
> +		if (ret) {
> +			dev_err(chip->dev, "unable to add GPIO pin range\n");
> +			goto err_rm_pin_range;
> +		}
> +	}
> +
> +	chip->pinmux_is_supported = 1;

	chip->pinmux_is_supported = true;

?

> +	return 0;
> +
> +err_rm_pin_range:
> +	gpiochip_remove_pin_ranges(gc);

I think you need:

	put_dveice(&pinmux_pdev->dev);

since of_find_device_by_node calls bus_find_device() that takes
reference to found device.

... And now that I look at this majority of users of
of_find_device_by_node() is broken like that :(

BTW, it looks like you only need pinmux_dev for it's name so you
probably need to drop reference in success path as well.

> +	return ret;
> +}
> +
> +static void cygnus_gpio_pinmux_remove_range(struct cygnus_gpio *chip)
> +{
> +	struct gpio_chip *gc = &chip->gc;
> +
> +	if (chip->pinmux_is_supported)
> +		gpiochip_remove_pin_ranges(gc);
> +}
> +
> +/*
> + * Cygnus GPIO controller supports some PINCONF related configurations such as
> + * pull up, pull down, and drive strength, when the pin is configured to GPIO
> + *
> + * Here a local pinctrl device is created with simple 1-to-1 pin mapping to the
> + * local GPIO pins
> + */
> +static int cygnus_gpio_register_pinconf(struct cygnus_gpio *chip)
> +{
> +	struct pinctrl_desc *pctldesc = &chip->pctldesc;
> +	struct pinctrl_pin_desc *pins;
> +	struct gpio_chip *gc = &chip->gc;
> +	int i, ret;
> +
> +	pins = devm_kcalloc(chip->dev, gc->ngpio, sizeof(*pins), GFP_KERNEL);
> +	if (!pins)
> +		return -ENOMEM;
> +	chip->pins = pins;
> +
> +	for (i = 0; i < gc->ngpio; i++) {
> +		pins[i].number = i;
> +		pins[i].name = kasprintf(GFP_KERNEL, "gpio-%d", i);

We have devm_kasprintf().

> +		if (!pins[i].name) {
> +			ret = -ENOMEM;
> +			goto err_kfree;
> +		}
> +	}
> +
> +	pctldesc->name = dev_name(chip->dev);
> +	pctldesc->pctlops = &cygnus_pctrl_ops;
> +	pctldesc->pins = pins;
> +	pctldesc->npins = gc->ngpio;
> +	pctldesc->confops = &cygnus_pconf_ops;
> +
> +	chip->pctl = pinctrl_register(pctldesc, chip->dev, chip);
> +	if (!chip->pctl) {
> +		dev_err(chip->dev, "unable to register pinctrl device\n");
> +		ret = -EINVAL;
> +		goto err_kfree;
> +	}
> +
> +	return 0;
> +
> +err_kfree:
> +	for (i = 0; i < gc->ngpio; i++)
> +		kfree(pins[i].name);
> +
> +	return ret;
> +}
> +
> +static void cygnus_gpio_unregister_pinconf(struct cygnus_gpio *chip)
> +{
> +	struct gpio_chip *gc = &chip->gc;
> +	int i;
> +
> +	if (chip->pctl)
> +		pinctrl_unregister(chip->pctl);
> +
> +	for (i = 0; i < gc->ngpio; i++)
> +		kfree(chip->pins[i].name);

Should not be needed if you use devm_kasprintf.

> +}
> +
> +static const struct of_device_id cygnus_gpio_of_match[] = {
> +	{ .compatible = "brcm,cygnus-gpio" },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, cygnus_gpio_of_match);
> +
> +static int cygnus_gpio_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct resource *res;
> +	struct cygnus_gpio *chip;
> +	struct gpio_chip *gc;
> +	u32 ngpios;
> +	int irq, ret;
> +
> +	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
> +	if (!chip)
> +		return -ENOMEM;
> +
> +	chip->dev = dev;
> +	platform_set_drvdata(pdev, chip);
> +
> +	if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
> +		dev_err(dev, "missing ngpios DT property\n");
> +		return -ENODEV;
> +	}
> +	chip->num_banks = (ngpios + NGPIOS_PER_BANK - 1) / NGPIOS_PER_BANK;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	chip->base = devm_ioremap_resource(dev, res);
> +	if (IS_ERR(chip->base)) {
> +		dev_err(dev, "unable to map I/O memory\n");
> +		return PTR_ERR(chip->base);
> +	}
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> +	if (res) {
> +		chip->io_ctrl = devm_ioremap_resource(dev, res);
> +		if (IS_ERR(chip->io_ctrl)) {
> +			dev_err(dev, "unable to map I/O memory\n");
> +			return PTR_ERR(chip->io_ctrl);
> +		}
> +	}
> +
> +	spin_lock_init(&chip->lock);
> +
> +	gc = &chip->gc;
> +	gc->base = -1;
> +	gc->ngpio = ngpios;
> +	gc->label = dev_name(dev);
> +	gc->dev = dev;
> +	gc->of_node = dev->of_node;
> +	gc->request = cygnus_gpio_request;
> +	gc->free = cygnus_gpio_free;
> +	gc->direction_input = cygnus_gpio_direction_input;
> +	gc->direction_output = cygnus_gpio_direction_output;
> +	gc->set = cygnus_gpio_set;
> +	gc->get = cygnus_gpio_get;
> +
> +	ret = gpiochip_add(gc);
> +	if (ret < 0) {
> +		dev_err(dev, "unable to add GPIO chip\n");
> +		return ret;
> +	}
> +
> +	ret = cygnus_gpio_pinmux_add_range(chip);
> +	if (ret && ret != -ENODEV) {
> +		dev_err(dev, "unable to add GPIO pin range\n");
> +		goto err_rm_gpiochip;
> +	}
> +
> +	ret = cygnus_gpio_register_pinconf(chip);
> +	if (ret) {
> +		dev_err(dev, "unable to register pinconf\n");
> +		goto err_rm_range;
> +	}
> +
> +	/* optional GPIO interrupt support */
> +	irq = platform_get_irq(pdev, 0);
> +	if (irq) {
> +		ret = gpiochip_irqchip_add(gc, &cygnus_gpio_irq_chip, 0,
> +					   handle_simple_irq, IRQ_TYPE_NONE);
> +		if (ret) {
> +			dev_err(dev, "no GPIO irqchip\n");
> +			goto err_unregister_pinconf;
> +		}
> +
> +		gpiochip_set_chained_irqchip(gc, &cygnus_gpio_irq_chip, irq,
> +					     cygnus_gpio_irq_handler);
> +	}
> +
> +	return 0;
> +
> +err_unregister_pinconf:
> +	cygnus_gpio_unregister_pinconf(chip);
> +
> +err_rm_range:
> +	cygnus_gpio_pinmux_remove_range(chip);
> +
> +err_rm_gpiochip:
> +	gpiochip_remove(gc);
> +
> +	return ret;
> +}
> +
> +static struct platform_driver cygnus_gpio_driver = {
> +	.driver = {
> +		.name = "cygnus-gpio",
> +		.of_match_table = cygnus_gpio_of_match,
> +	},
> +	.probe = cygnus_gpio_probe,

The same comment about suppress_bind_attrs.

> +};
> +
> +static int __init cygnus_gpio_init(void)
> +{
> +	return platform_driver_probe(&cygnus_gpio_driver, cygnus_gpio_probe);
> +}
> +arch_initcall_sync(cygnus_gpio_init);
> +
> +MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
> +MODULE_DESCRIPTION("Broadcom Cygnus GPIO Driver");
> +MODULE_LICENSE("GPL v2");
> -- 
> 1.7.9.5
> 

Thanks.

-- 
Dmitry

[PATCH v7 2/4] pinctrl: cygnus: add gpio/pinconf driver

[Dmitry Torokhov]

On Tue, Feb 03, 2015 at 05:09:06PM -0800, Ray Jui wrote:
> This adds the initial support of the Broadcom Cygnus GPIO/PINCONF driver
> that supports all 3 GPIO controllers on Cygnus including the ASIU GPIO
> controller, the chipCommonG GPIO controller, and the always-on GPIO
> controller. Basic PINCONF configurations such as bias pull up/down, and
> drive strength are also supported in this driver.
> 
> Pins from the ASIU GPIO controller can be individually muxed to GPIO
> function, through interaction with the Cygnus IOMUX controller
> 
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> ---
>  drivers/pinctrl/bcm/Kconfig               |   22 +
>  drivers/pinctrl/bcm/Makefile              |    1 +
>  drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c |  920 +++++++++++++++++++++++++++++
>  3 files changed, 943 insertions(+)
>  create mode 100644 drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c
> 
> diff --git a/drivers/pinctrl/bcm/Kconfig b/drivers/pinctrl/bcm/Kconfig
> index eb13201..cd11d4d 100644
> --- a/drivers/pinctrl/bcm/Kconfig
> +++ b/drivers/pinctrl/bcm/Kconfig
> @@ -20,6 +20,28 @@ config PINCTRL_BCM2835
>  	select PINMUX
>  	select PINCONF
>  
> +config PINCTRL_CYGNUS_GPIO
> +	bool "Broadcom Cygnus GPIO (with PINCONF) driver"
> +	depends on OF_GPIO && ARCH_BCM_CYGNUS
> +	select GPIOLIB_IRQCHIP
> +	select PINCONF
> +	select GENERIC_PINCONF
> +	default ARCH_BCM_CYGNUS
> +	help
> +	  Say yes here to enable the Broadcom Cygnus GPIO driver.
> +
> +	  The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
> +	  GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
> +	  the always-ON GPIO controller (CRMU/AON). All 3 GPIO controllers are
> +	  supported by this driver.
> +
> +	  All 3 Cygnus GPIO controllers support basic PINCONF functions such
> +	  as bias pull up, pull down, and drive strength configurations, when
> +	  these pins are muxed to GPIO.
> +
> +	  Pins from the ASIU GPIO can be individually muxed to GPIO function,
> +	  through interaction with the Cygnus IOMUX controller.
> +
>  config PINCTRL_CYGNUS_MUX
>  	bool "Broadcom Cygnus IOMUX driver"
>  	depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
> diff --git a/drivers/pinctrl/bcm/Makefile b/drivers/pinctrl/bcm/Makefile
> index bb6beb6..2b2f70e 100644
> --- a/drivers/pinctrl/bcm/Makefile
> +++ b/drivers/pinctrl/bcm/Makefile
> @@ -2,4 +2,5 @@
>  
>  obj-$(CONFIG_PINCTRL_BCM281XX)		+= pinctrl-bcm281xx.o
>  obj-$(CONFIG_PINCTRL_BCM2835)		+= pinctrl-bcm2835.o
> +obj-$(CONFIG_PINCTRL_CYGNUS_GPIO)	+= pinctrl-cygnus-gpio.o
>  obj-$(CONFIG_PINCTRL_CYGNUS_MUX)	+= pinctrl-cygnus-mux.o
> diff --git a/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c b/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c
> new file mode 100644
> index 0000000..cfe4478
> --- /dev/null
> +++ b/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c
> @@ -0,0 +1,920 @@
> +/*
> + * Copyright (C) 2014-2015 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * This file contains the Broadcom Cygnus GPIO driver that supports 3
> + * GPIO controllers on Cygnus including the ASIU GPIO controller, the
> + * chipCommonG GPIO controller, and the always-on GPIO controller. Basic
> + * PINCONF such as bias pull up/down, and drive strength are also supported
> + * in this driver.
> + *
> + * Pins from the ASIU GPIO can be individually muxed to GPIO function,
> + * through the interaction with the Cygnus IOMUX controller
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/slab.h>
> +#include <linux/module.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/gpio.h>
> +#include <linux/ioport.h>
> +#include <linux/of_device.h>
> +#include <linux/of_irq.h>
> +#include <linux/pinctrl/pinctrl.h>
> +#include <linux/pinctrl/pinmux.h>
> +#include <linux/pinctrl/pinconf.h>
> +#include <linux/pinctrl/pinconf-generic.h>
> +
> +#include "../pinctrl-utils.h"
> +
> +#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
> +#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
> +#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
> +#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
> +#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
> +#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
> +#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
> +#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
> +#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
> +#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
> +#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
> +#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
> +
> +/* drive strength control for ASIU GPIO */
> +#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
> +
> +/* drive strength control for CCM/CRMU (AON) GPIO */
> +#define CYGNUS_GPIO_DRV0_CTRL_OFFSET  0x00
> +
> +#define GPIO_BANK_SIZE 0x200
> +#define NGPIOS_PER_BANK 32
> +#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
> +
> +#define CYGNUS_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + (reg))
> +#define CYGNUS_GPIO_SHIFT(pin) ((pin) % NGPIOS_PER_BANK)
> +
> +#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
> +#define GPIO_DRV_STRENGTH_BITS       3
> +#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
> +
> +/*
> + * Cygnus GPIO core
> + *
> + * @dev: pointer to device
> + * @base: I/O register base for Cygnus GPIO controller
> + * @io_ctrl: I/O register base for certain type of Cygnus GPIO controller that
> + * has the PINCONF support implemented outside of the GPIO block
> + * @lock: lock to protect access to I/O registers
> + * @gc: GPIO chip
> + * @num_banks: number of GPIO banks, each bank supports up to 32 GPIOs
> + * @pinmux_is_supported: flag to indicate this GPIO controller contains pins
> + * that can be individually muxed to GPIO
> + * @pctl: pointer to pinctrl_dev
> + * @pctldesc: pinctrl descriptor
> + * @pins: pointer to array of pins
> + */
> +struct cygnus_gpio {
> +	struct device *dev;
> +
> +	void __iomem *base;
> +	void __iomem *io_ctrl;
> +
> +	spinlock_t lock;
> +
> +	struct gpio_chip gc;
> +	unsigned num_banks;
> +
> +	int pinmux_is_supported;

bool?

> +
> +	struct pinctrl_dev *pctl;
> +	struct pinctrl_desc pctldesc;
> +	struct pinctrl_pin_desc *pins;
> +};
> +
> +static struct cygnus_gpio *to_cygnus_gpio(struct gpio_chip *gc)
> +{
> +	return container_of(gc, struct cygnus_gpio, gc);
> +}
> +
> +/*
> + * Mapping from PINCONF pins to GPIO pins is 1-to-1
> + */
> +static unsigned cygnus_pin_to_gpio(unsigned pin)
> +{
> +	return pin;
> +}
> +
> +static u32 cygnus_readl(struct cygnus_gpio *chip, unsigned int offset)
> +{
> +	return readl(chip->base + offset);
> +}
> +
> +static void cygnus_writel(struct cygnus_gpio *chip, unsigned int offset,
> +			  u32 val)
> +{
> +	writel(val, chip->base + offset);
> +}
> +
> +/**
> + *  cygnus_set_bit - set or clear one bit (corresponding to the GPIO pin) in a
> + *  Cygnus GPIO register
> + *
> + *  @cygnus_gpio: Cygnus GPIO device
> + *  @reg: register offset
> + *  @gpio: GPIO pin
> + *  @set: set or clear. 1 - set; 0 -clear
> + */
> +static void cygnus_set_bit(struct cygnus_gpio *chip, unsigned int reg,
> +			   unsigned gpio, int set)
> +{
> +	unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
> +	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
> +	u32 val;
> +
> +	val = cygnus_readl(chip, offset);
> +	if (set)
> +		val |= BIT(shift);
> +	else
> +		val &= ~BIT(shift);
> +	cygnus_writel(chip, offset, val);
> +}
> +
> +static int cygnus_get_bit(struct cygnus_gpio *chip, unsigned int reg,
> +			  unsigned gpio)
> +{
> +	unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
> +	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
> +	u32 val;
> +
> +	val = cygnus_readl(chip, offset) & BIT(shift);
> +	if (val)
> +		return 1;
> +	else
> +		return 0;
> +}
> +
> +static void cygnus_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
> +{
> +	struct gpio_chip *gc = irq_desc_get_handler_data(desc);
> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
> +	struct irq_chip *irq_chip = irq_desc_get_chip(desc);
> +	int i, bit;
> +
> +	chained_irq_enter(irq_chip, desc);
> +
> +	/* go through the entire GPIO banks and handle all interrupts */
> +	for (i = 0; i < chip->num_banks; i++) {
> +		unsigned long val = cygnus_readl(chip,
> +				(i * GPIO_BANK_SIZE) +
> +				CYGNUS_GPIO_INT_MSTAT_OFFSET);
> +
> +		for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
> +			unsigned pin = NGPIOS_PER_BANK * i + bit;
> +			int child_irq = irq_find_mapping(gc->irqdomain, pin);
> +
> +			/*
> +			 * Clear the interrupt before invoking the
> +			 * handler, so we do not leave any window
> +			 */
> +			cygnus_writel(chip, (i * GPIO_BANK_SIZE) +
> +				      CYGNUS_GPIO_INT_CLR_OFFSET, BIT(bit));
> +
> +			generic_handle_irq(child_irq);
> +		}
> +	}
> +
> +	chained_irq_exit(irq_chip, desc);
> +}
> +
> +
> +static void cygnus_gpio_irq_ack(struct irq_data *d)
> +{
> +	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
> +	unsigned gpio = d->hwirq;
> +	unsigned int offset = CYGNUS_GPIO_REG(gpio,
> +			CYGNUS_GPIO_INT_CLR_OFFSET);
> +	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
> +	u32 val = BIT(shift);
> +
> +	cygnus_writel(chip, offset, val);
> +}
> +
> +/**
> + *  cygnus_gpio_irq_set_mask - mask/unmask a GPIO interrupt
> + *
> + *  @d: IRQ chip data
> + *  @mask: mask/unmask GPIO interrupt. 0 - mask (disable); 1 - unmask (enable)
> + */
> +static void cygnus_gpio_irq_set_mask(struct irq_data *d, int mask)
> +{
> +	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
> +	unsigned gpio = d->hwirq;
> +
> +	cygnus_set_bit(chip, CYGNUS_GPIO_INT_MSK_OFFSET, gpio, mask);
> +}
> +
> +static void cygnus_gpio_irq_mask(struct irq_data *d)
> +{
> +	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&chip->lock, flags);
> +	cygnus_gpio_irq_set_mask(d, 0);
> +	spin_unlock_irqrestore(&chip->lock, flags);
> +}
> +
> +static void cygnus_gpio_irq_unmask(struct irq_data *d)
> +{
> +	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&chip->lock, flags);
> +	cygnus_gpio_irq_set_mask(d, 1);
> +	spin_unlock_irqrestore(&chip->lock, flags);
> +}
> +
> +static int cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
> +{
> +	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
> +	unsigned gpio = d->hwirq;
> +	int int_type = 0, dual_edge = 0, edge_lvl = 0;
> +	unsigned long flags;
> +
> +	switch (type & IRQ_TYPE_SENSE_MASK) {
> +	case IRQ_TYPE_EDGE_RISING:
> +		edge_lvl = 1;
> +		break;
> +
> +	case IRQ_TYPE_EDGE_FALLING:
> +		break;
> +
> +	case IRQ_TYPE_EDGE_BOTH:
> +		dual_edge = 1;
> +		break;
> +
> +	case IRQ_TYPE_LEVEL_HIGH:
> +		int_type = 1;
> +		edge_lvl = 1;
> +		break;
> +
> +	case IRQ_TYPE_LEVEL_LOW:
> +		int_type = 1;
> +		break;
> +
> +	default:
> +		dev_err(chip->dev, "invalid GPIO IRQ type 0x%x\n",
> +			type);
> +		return -EINVAL;
> +	}
> +
> +	spin_lock_irqsave(&chip->lock, flags);
> +	cygnus_set_bit(chip, CYGNUS_GPIO_IN_TYPE_OFFSET, gpio, int_type);
> +	cygnus_set_bit(chip, CYGNUS_GPIO_INT_DE_OFFSET, gpio, dual_edge);
> +	cygnus_set_bit(chip, CYGNUS_GPIO_INT_EDGE_OFFSET, gpio,
> +		       edge_lvl);
> +	spin_unlock_irqrestore(&chip->lock, flags);
> +
> +	dev_dbg(chip->dev,
> +		"gpio:%u set int_type:%d dual_edge:%d edge_lvl:%d\n",
> +		gpio, int_type, dual_edge, edge_lvl);
> +
> +	return 0;
> +}
> +
> +static struct irq_chip cygnus_gpio_irq_chip = {
> +	.name = "bcm-cygnus-gpio",
> +	.irq_ack = cygnus_gpio_irq_ack,
> +	.irq_mask = cygnus_gpio_irq_mask,
> +	.irq_unmask = cygnus_gpio_irq_unmask,
> +	.irq_set_type = cygnus_gpio_irq_set_type,
> +};
> +
> +/*
> + * Request the Cygnus IOMUX pinmux controller to mux individual pins to GPIO
> + */
> +static int cygnus_gpio_request(struct gpio_chip *gc, unsigned offset)
> +{
> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
> +	unsigned gpio = gc->base + offset;
> +
> +	/* not all Cygnus GPIO pins can be muxed individually */
> +	if (!chip->pinmux_is_supported)
> +		return 0;
> +
> +	return pinctrl_request_gpio(gpio);
> +}
> +
> +static void cygnus_gpio_free(struct gpio_chip *gc, unsigned offset)
> +{
> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
> +	unsigned gpio = gc->base + offset;
> +
> +	if (!chip->pinmux_is_supported)
> +		return;
> +
> +	pinctrl_free_gpio(gpio);
> +}
> +
> +static int cygnus_gpio_direction_input(struct gpio_chip *gc, unsigned gpio)
> +{
> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&chip->lock, flags);
> +	cygnus_set_bit(chip, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 0);
> +	spin_unlock_irqrestore(&chip->lock, flags);
> +
> +	dev_dbg(chip->dev, "gpio:%u set input\n", gpio);
> +
> +	return 0;
> +}
> +
> +static int cygnus_gpio_direction_output(struct gpio_chip *gc, unsigned gpio,
> +					int value)
> +{
> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&chip->lock, flags);
> +	cygnus_set_bit(chip, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 1);
> +	cygnus_set_bit(chip, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
> +	spin_unlock_irqrestore(&chip->lock, flags);
> +
> +	dev_dbg(chip->dev, "gpio:%u set output, value:%d\n", gpio, value);
> +
> +	return 0;
> +}
> +
> +static void cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio, int value)
> +{
> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&chip->lock, flags);
> +	cygnus_set_bit(chip, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
> +	spin_unlock_irqrestore(&chip->lock, flags);
> +
> +	dev_dbg(chip->dev, "gpio:%u set, value:%d\n", gpio, value);
> +}
> +
> +static int cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
> +{
> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
> +	unsigned int offset = CYGNUS_GPIO_REG(gpio,
> +					      CYGNUS_GPIO_DATA_IN_OFFSET);
> +	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
> +
> +	return !!(cygnus_readl(chip, offset) & BIT(shift));
> +}
> +
> +static int cygnus_get_groups_count(struct pinctrl_dev *pctldev)
> +{
> +	return 1;
> +}
> +
> +/*
> + * Only one group: "gpio_grp", since this local pinctrl device only performs
> + * GPIO specific PINCONF configurations
> + */
> +static const char *cygnus_get_group_name(struct pinctrl_dev *pctldev,
> +					 unsigned selector)
> +{
> +

Extra blank line.

> +	return "gpio_grp";
> +}
> +
> +static const struct pinctrl_ops cygnus_pctrl_ops = {
> +	.get_groups_count = cygnus_get_groups_count,
> +	.get_group_name = cygnus_get_group_name,
> +	.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
> +	.dt_free_map = pinctrl_utils_dt_free_map,
> +};
> +
> +static int cygnus_gpio_set_pull(struct cygnus_gpio *chip, unsigned gpio,
> +				int disable, int pull_up)
> +{
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&chip->lock, flags);
> +
> +	if (disable) {
> +		cygnus_set_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio, 0);
> +	} else {
> +		cygnus_set_bit(chip, CYGNUS_GPIO_PAD_RES_OFFSET, gpio,
> +			       pull_up);
> +		cygnus_set_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio, 1);
> +	}
> +
> +	spin_unlock_irqrestore(&chip->lock, flags);
> +
> +	dev_dbg(chip->dev, "gpio:%u set pullup:%d\n", gpio, pull_up);
> +
> +	return 0;
> +}
> +
> +static void cygnus_gpio_get_pull(struct cygnus_gpio *chip, unsigned gpio,
> +				 int *disable, int *pull_up)
> +{
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&chip->lock, flags);
> +	*disable = !cygnus_get_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio);
> +	*pull_up = cygnus_get_bit(chip, CYGNUS_GPIO_PAD_RES_OFFSET, gpio);
> +	spin_unlock_irqrestore(&chip->lock, flags);
> +}
> +
> +static int cygnus_gpio_set_strength(struct cygnus_gpio *chip, unsigned gpio,
> +				    unsigned strength)
> +{
> +	void __iomem *base;
> +	unsigned int i, offset, shift;
> +	u32 val;
> +	unsigned long flags;
> +
> +	/* make sure drive strength is supported */
> +	if (strength < 2 ||  strength > 16 || (strength % 2))
> +		return -ENOTSUPP;
> +
> +	if (chip->io_ctrl) {
> +		base = chip->io_ctrl;
> +		offset = CYGNUS_GPIO_DRV0_CTRL_OFFSET;
> +	} else {
> +		base = chip->base;
> +		offset = CYGNUS_GPIO_REG(gpio,
> +					 CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET);
> +	}
> +
> +	shift = CYGNUS_GPIO_SHIFT(gpio);
> +
> +	dev_dbg(chip->dev, "gpio:%u set drive strength:%d mA\n", gpio,
> +		strength);
> +
> +	spin_lock_irqsave(&chip->lock, flags);
> +	strength = (strength / 2) - 1;
> +	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
> +		val = readl(base + offset);
> +		val &= ~BIT(shift);
> +		val |= ((strength >> i) & 0x1) << shift;
> +		writel(val, base + offset);
> +		offset += 4;
> +	}
> +	spin_unlock_irqrestore(&chip->lock, flags);
> +
> +	return 0;
> +}
> +
> +static int cygnus_gpio_get_strength(struct cygnus_gpio *chip, unsigned gpio,
> +				    u16 *strength)
> +{
> +	void __iomem *base;
> +	unsigned int i, offset, shift;
> +	u32 val;
> +	unsigned long flags;
> +
> +	if (chip->io_ctrl) {
> +		base = chip->io_ctrl;
> +		offset = CYGNUS_GPIO_DRV0_CTRL_OFFSET;
> +	} else {
> +		base = chip->base;
> +		offset = CYGNUS_GPIO_REG(gpio,
> +					 CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET);
> +	}
> +
> +	shift = CYGNUS_GPIO_SHIFT(gpio);
> +
> +	spin_lock_irqsave(&chip->lock, flags);
> +	*strength = 0;
> +	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
> +		val = readl(base + offset) & BIT(shift);
> +		val >>= shift;
> +		*strength += (val << i);
> +		offset += 4;
> +	}
> +
> +	/* convert to mA */
> +	*strength = (*strength + 1) * 2;
> +	spin_unlock_irqrestore(&chip->lock, flags);
> +
> +	return 0;
> +}
> +
> +static int cygnus_pin_config_get(struct pinctrl_dev *pctldev, unsigned pin,
> +				 unsigned long *config)
> +{
> +	struct cygnus_gpio *chip = pinctrl_dev_get_drvdata(pctldev);
> +	enum pin_config_param param = pinconf_to_config_param(*config);
> +	unsigned gpio = cygnus_pin_to_gpio(pin);
> +	u16 arg;
> +	int disable, pull_up, ret;
> +
> +	switch (param) {
> +	case PIN_CONFIG_BIAS_DISABLE:
> +		cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
> +		if (disable)
> +			return 0;
> +		else
> +			return -EINVAL;
> +
> +	case PIN_CONFIG_BIAS_PULL_UP:
> +		cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
> +		if (!disable && pull_up)
> +			return 0;
> +		else
> +			return -EINVAL;
> +
> +	case PIN_CONFIG_BIAS_PULL_DOWN:
> +		cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
> +		if (!disable && !pull_up)
> +			return 0;
> +		else
> +			return -EINVAL;
> +
> +	case PIN_CONFIG_DRIVE_STRENGTH:
> +		ret = cygnus_gpio_get_strength(chip, gpio, &arg);
> +		if (ret)
> +			return ret;
> +		else
> +			*config = pinconf_to_config_packed(param, arg);
> +
> +		return 0;
> +
> +	default:
> +		return -ENOTSUPP;
> +	}
> +
> +	return -ENOTSUPP;
> +}
> +
> +static int cygnus_pin_config_set(struct pinctrl_dev *pctldev, unsigned pin,
> +				 unsigned long *configs, unsigned num_configs)
> +{
> +	struct cygnus_gpio *chip = pinctrl_dev_get_drvdata(pctldev);
> +	enum pin_config_param param;
> +	u16 arg;
> +	unsigned i, gpio = cygnus_pin_to_gpio(pin);
> +	int ret = -ENOTSUPP;
> +
> +	for (i = 0; i < num_configs; i++) {
> +		param = pinconf_to_config_param(configs[i]);
> +		arg = pinconf_to_config_argument(configs[i]);
> +
> +		switch (param) {
> +		case PIN_CONFIG_BIAS_DISABLE:
> +			ret = cygnus_gpio_set_pull(chip, gpio, 1, 0);
> +			if (ret < 0)
> +				goto out;
> +			break;
> +
> +		case PIN_CONFIG_BIAS_PULL_UP:
> +			ret = cygnus_gpio_set_pull(chip, gpio, 0, 1);
> +			if (ret < 0)
> +				goto out;
> +			break;
> +
> +		case PIN_CONFIG_BIAS_PULL_DOWN:
> +			ret = cygnus_gpio_set_pull(chip, gpio, 0, 0);
> +			if (ret < 0)
> +				goto out;
> +			break;
> +
> +		case PIN_CONFIG_DRIVE_STRENGTH:
> +			ret = cygnus_gpio_set_strength(chip, gpio, arg);
> +			if (ret < 0)
> +				goto out;
> +			break;
> +
> +		default:
> +			dev_err(chip->dev, "invalid configuration\n");
> +			return -ENOTSUPP;
> +		}
> +	} /* for each config */
> +
> +out:
> +	return ret;
> +}
> +
> +static const struct pinconf_ops cygnus_pconf_ops = {
> +	.is_generic = true,
> +	.pin_config_get = cygnus_pin_config_get,
> +	.pin_config_set = cygnus_pin_config_set,
> +};
> +
> +/*
> + * Map a GPIO in the local gpio_chip pin space to a pin in the Cygnus IOMUX
> + * pinctrl pin space
> + */
> +struct cygnus_gpio_pin_range {
> +	unsigned offset;
> +	unsigned pin_base;
> +	unsigned num_pins;
> +};
> +
> +#define CYGNUS_PINRANGE(o, p, n) { .offset = o, .pin_base = p, .num_pins = n }
> +
> +/*
> + * Pin mapping table for mapping local GPIO pins to Cygnus IOMUX pinctrl pins
> + */
> +static const struct cygnus_gpio_pin_range cygnus_gpio_pintable[] = {
> +	CYGNUS_PINRANGE(0, 42, 1),
> +	CYGNUS_PINRANGE(1, 44, 3),
> +	CYGNUS_PINRANGE(4, 48, 1),
> +	CYGNUS_PINRANGE(5, 50, 3),
> +	CYGNUS_PINRANGE(8, 126, 1),
> +	CYGNUS_PINRANGE(9, 155, 1),
> +	CYGNUS_PINRANGE(10, 152, 1),
> +	CYGNUS_PINRANGE(11, 154, 1),
> +	CYGNUS_PINRANGE(12, 153, 1),
> +	CYGNUS_PINRANGE(13, 127, 3),
> +	CYGNUS_PINRANGE(16, 140, 1),
> +	CYGNUS_PINRANGE(17, 145, 7),
> +	CYGNUS_PINRANGE(24, 130, 10),
> +	CYGNUS_PINRANGE(34, 141, 4),
> +	CYGNUS_PINRANGE(38, 54, 1),
> +	CYGNUS_PINRANGE(39, 56, 3),
> +	CYGNUS_PINRANGE(42, 60, 3),
> +	CYGNUS_PINRANGE(45, 64, 3),
> +	CYGNUS_PINRANGE(48, 68, 2),
> +	CYGNUS_PINRANGE(50, 84, 6),
> +	CYGNUS_PINRANGE(56, 94, 6),
> +	CYGNUS_PINRANGE(62, 72, 1),
> +	CYGNUS_PINRANGE(63, 70, 1),
> +	CYGNUS_PINRANGE(64, 80, 1),
> +	CYGNUS_PINRANGE(65, 74, 3),
> +	CYGNUS_PINRANGE(68, 78, 1),
> +	CYGNUS_PINRANGE(69, 82, 1),
> +	CYGNUS_PINRANGE(70, 156, 17),
> +	CYGNUS_PINRANGE(87, 104, 12),
> +	CYGNUS_PINRANGE(99, 102, 2),
> +	CYGNUS_PINRANGE(101, 90, 4),
> +	CYGNUS_PINRANGE(105, 116, 10),
> +	CYGNUS_PINRANGE(123, 11, 1),
> +	CYGNUS_PINRANGE(124, 38, 4),
> +	CYGNUS_PINRANGE(128, 43, 1),
> +	CYGNUS_PINRANGE(129, 47, 1),
> +	CYGNUS_PINRANGE(130, 49, 1),
> +	CYGNUS_PINRANGE(131, 53, 1),
> +	CYGNUS_PINRANGE(132, 55, 1),
> +	CYGNUS_PINRANGE(133, 59, 1),
> +	CYGNUS_PINRANGE(134, 63, 1),
> +	CYGNUS_PINRANGE(135, 67, 1),
> +	CYGNUS_PINRANGE(136, 71, 1),
> +	CYGNUS_PINRANGE(137, 73, 1),
> +	CYGNUS_PINRANGE(138, 77, 1),
> +	CYGNUS_PINRANGE(139, 79, 1),
> +	CYGNUS_PINRANGE(140, 81, 1),
> +	CYGNUS_PINRANGE(141, 83, 1),
> +	CYGNUS_PINRANGE(142, 10, 1)
> +};
> +
> +/*
> + * The Cygnus IOMUX controller mainly supports group based mux configuration,
> + * but certain pins can be muxed to GPIO individually. Only the ASIU GPIO
> + * controller can support this, so it's an optional configuration
> + *
> + * Return -ENODEV means no support and that's fine
> + */
> +static int cygnus_gpio_pinmux_add_range(struct cygnus_gpio *chip)
> +{
> +	struct device_node *node = chip->dev->of_node;
> +	struct device_node *pinmux_node;
> +	struct platform_device *pinmux_pdev;
> +	struct gpio_chip *gc = &chip->gc;
> +	int i, ret;
> +
> +	/* parse DT to find the phandle to the pinmux controller */
> +	pinmux_node = of_parse_phandle(node, "pinmux", 0);
> +	if (!pinmux_node)
> +		return -ENODEV;
> +
> +	pinmux_pdev = of_find_device_by_node(pinmux_node);
> +	if (!pinmux_pdev) {
> +		dev_err(chip->dev, "failed to get pinmux device\n");
> +		return -EINVAL;
> +	}
> +
> +	/* now need to create the mapping between local GPIO and PINMUX pins */
> +	for (i = 0; i < ARRAY_SIZE(cygnus_gpio_pintable); i++) {
> +		ret = gpiochip_add_pin_range(gc, dev_name(&pinmux_pdev->dev),
> +					     cygnus_gpio_pintable[i].offset,
> +					     cygnus_gpio_pintable[i].pin_base,
> +					     cygnus_gpio_pintable[i].num_pins);
> +		if (ret) {
> +			dev_err(chip->dev, "unable to add GPIO pin range\n");
> +			goto err_rm_pin_range;
> +		}
> +	}
> +
> +	chip->pinmux_is_supported = 1;

	chip->pinmux_is_supported = true;

?

> +	return 0;
> +
> +err_rm_pin_range:
> +	gpiochip_remove_pin_ranges(gc);

I think you need:

	put_dveice(&pinmux_pdev->dev);

since of_find_device_by_node calls bus_find_device() that takes
reference to found device.

... And now that I look at this majority of users of
of_find_device_by_node() is broken like that :(

BTW, it looks like you only need pinmux_dev for it's name so you
probably need to drop reference in success path as well.

> +	return ret;
> +}
> +
> +static void cygnus_gpio_pinmux_remove_range(struct cygnus_gpio *chip)
> +{
> +	struct gpio_chip *gc = &chip->gc;
> +
> +	if (chip->pinmux_is_supported)
> +		gpiochip_remove_pin_ranges(gc);
> +}
> +
> +/*
> + * Cygnus GPIO controller supports some PINCONF related configurations such as
> + * pull up, pull down, and drive strength, when the pin is configured to GPIO
> + *
> + * Here a local pinctrl device is created with simple 1-to-1 pin mapping to the
> + * local GPIO pins
> + */
> +static int cygnus_gpio_register_pinconf(struct cygnus_gpio *chip)
> +{
> +	struct pinctrl_desc *pctldesc = &chip->pctldesc;
> +	struct pinctrl_pin_desc *pins;
> +	struct gpio_chip *gc = &chip->gc;
> +	int i, ret;
> +
> +	pins = devm_kcalloc(chip->dev, gc->ngpio, sizeof(*pins), GFP_KERNEL);
> +	if (!pins)
> +		return -ENOMEM;
> +	chip->pins = pins;
> +
> +	for (i = 0; i < gc->ngpio; i++) {
> +		pins[i].number = i;
> +		pins[i].name = kasprintf(GFP_KERNEL, "gpio-%d", i);

We have devm_kasprintf().

> +		if (!pins[i].name) {
> +			ret = -ENOMEM;
> +			goto err_kfree;
> +		}
> +	}
> +
> +	pctldesc->name = dev_name(chip->dev);
> +	pctldesc->pctlops = &cygnus_pctrl_ops;
> +	pctldesc->pins = pins;
> +	pctldesc->npins = gc->ngpio;
> +	pctldesc->confops = &cygnus_pconf_ops;
> +
> +	chip->pctl = pinctrl_register(pctldesc, chip->dev, chip);
> +	if (!chip->pctl) {
> +		dev_err(chip->dev, "unable to register pinctrl device\n");
> +		ret = -EINVAL;
> +		goto err_kfree;
> +	}
> +
> +	return 0;
> +
> +err_kfree:
> +	for (i = 0; i < gc->ngpio; i++)
> +		kfree(pins[i].name);
> +
> +	return ret;
> +}
> +
> +static void cygnus_gpio_unregister_pinconf(struct cygnus_gpio *chip)
> +{
> +	struct gpio_chip *gc = &chip->gc;
> +	int i;
> +
> +	if (chip->pctl)
> +		pinctrl_unregister(chip->pctl);
> +
> +	for (i = 0; i < gc->ngpio; i++)
> +		kfree(chip->pins[i].name);

Should not be needed if you use devm_kasprintf.

> +}
> +
> +static const struct of_device_id cygnus_gpio_of_match[] = {
> +	{ .compatible = "brcm,cygnus-gpio" },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, cygnus_gpio_of_match);
> +
> +static int cygnus_gpio_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct resource *res;
> +	struct cygnus_gpio *chip;
> +	struct gpio_chip *gc;
> +	u32 ngpios;
> +	int irq, ret;
> +
> +	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
> +	if (!chip)
> +		return -ENOMEM;
> +
> +	chip->dev = dev;
> +	platform_set_drvdata(pdev, chip);
> +
> +	if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
> +		dev_err(dev, "missing ngpios DT property\n");
> +		return -ENODEV;
> +	}
> +	chip->num_banks = (ngpios + NGPIOS_PER_BANK - 1) / NGPIOS_PER_BANK;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	chip->base = devm_ioremap_resource(dev, res);
> +	if (IS_ERR(chip->base)) {
> +		dev_err(dev, "unable to map I/O memory\n");
> +		return PTR_ERR(chip->base);
> +	}
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> +	if (res) {
> +		chip->io_ctrl = devm_ioremap_resource(dev, res);
> +		if (IS_ERR(chip->io_ctrl)) {
> +			dev_err(dev, "unable to map I/O memory\n");
> +			return PTR_ERR(chip->io_ctrl);
> +		}
> +	}
> +
> +	spin_lock_init(&chip->lock);
> +
> +	gc = &chip->gc;
> +	gc->base = -1;
> +	gc->ngpio = ngpios;
> +	gc->label = dev_name(dev);
> +	gc->dev = dev;
> +	gc->of_node = dev->of_node;
> +	gc->request = cygnus_gpio_request;
> +	gc->free = cygnus_gpio_free;
> +	gc->direction_input = cygnus_gpio_direction_input;
> +	gc->direction_output = cygnus_gpio_direction_output;
> +	gc->set = cygnus_gpio_set;
> +	gc->get = cygnus_gpio_get;
> +
> +	ret = gpiochip_add(gc);
> +	if (ret < 0) {
> +		dev_err(dev, "unable to add GPIO chip\n");
> +		return ret;
> +	}
> +
> +	ret = cygnus_gpio_pinmux_add_range(chip);
> +	if (ret && ret != -ENODEV) {
> +		dev_err(dev, "unable to add GPIO pin range\n");
> +		goto err_rm_gpiochip;
> +	}
> +
> +	ret = cygnus_gpio_register_pinconf(chip);
> +	if (ret) {
> +		dev_err(dev, "unable to register pinconf\n");
> +		goto err_rm_range;
> +	}
> +
> +	/* optional GPIO interrupt support */
> +	irq = platform_get_irq(pdev, 0);
> +	if (irq) {
> +		ret = gpiochip_irqchip_add(gc, &cygnus_gpio_irq_chip, 0,
> +					   handle_simple_irq, IRQ_TYPE_NONE);
> +		if (ret) {
> +			dev_err(dev, "no GPIO irqchip\n");
> +			goto err_unregister_pinconf;
> +		}
> +
> +		gpiochip_set_chained_irqchip(gc, &cygnus_gpio_irq_chip, irq,
> +					     cygnus_gpio_irq_handler);
> +	}
> +
> +	return 0;
> +
> +err_unregister_pinconf:
> +	cygnus_gpio_unregister_pinconf(chip);
> +
> +err_rm_range:
> +	cygnus_gpio_pinmux_remove_range(chip);
> +
> +err_rm_gpiochip:
> +	gpiochip_remove(gc);
> +
> +	return ret;
> +}
> +
> +static struct platform_driver cygnus_gpio_driver = {
> +	.driver = {
> +		.name = "cygnus-gpio",
> +		.of_match_table = cygnus_gpio_of_match,
> +	},
> +	.probe = cygnus_gpio_probe,

The same comment about suppress_bind_attrs.

> +};
> +
> +static int __init cygnus_gpio_init(void)
> +{
> +	return platform_driver_probe(&cygnus_gpio_driver, cygnus_gpio_probe);
> +}
> +arch_initcall_sync(cygnus_gpio_init);
> +
> +MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
> +MODULE_DESCRIPTION("Broadcom Cygnus GPIO Driver");
> +MODULE_LICENSE("GPL v2");
> -- 
> 1.7.9.5
> 

Thanks.

-- 
Dmitry

[PATCH v4 0/4] Add pinctrl support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial pinctrl (IOMUX) support for the Broadcom
Cygnus SoC. The Cygnus IOMUX controller supports group based mux configuration
and allows certain pins to be muxed to GPIO function individually

Changes from v3:
 - Fix the driver to have more proper use of "const" in various places
 - Other minor improvements

Changes from v2:
 - Consolidate all Broadcom pinctrl drivers into drivers/pinctrl/bcm/*
 - Change the Cygnus IOMUX driver to use standard Linux pinctrl subnode
properties such as "function" and "groups" for pinmux configuration, instead
of non-standard properties such as "brcm,function" and "brcm,group"
 - Use real function names like "spi0", "lcd", "key", and etc. instead of HW
specific mux names like "alt1", "alt2", "alt3", and etc.
 - Add suffix "grp" to all group names
 - Add support to allow individual pins to be muxed to GPIO function through
subsystem callbacks "gpio_request_enable" and "gpio_disable_free", and get rid
of all GPIO groups
 - Other minor improvements in the driver

Changes from v1:
 - Fix a typo in device tree binding document

Ray Jui (4):
  pinctrl: bcm: consolidate Broadcom pinctrl drivers
  pinctrl: Broadcom Cygnus pinctrl device tree binding
  pinctrl: cygnus: add initial IOMUX driver support
  ARM: dts: enable IOMUX for Broadcom Cygnus

 .../bindings/pinctrl/brcm,cygnus-pinmux.txt        |  157 +++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |    6 +
 drivers/pinctrl/Kconfig                            |   19 +-
 drivers/pinctrl/Makefile                           |    4 +-
 drivers/pinctrl/bcm/Kconfig                        |   34 +
 drivers/pinctrl/bcm/Makefile                       |    5 +
 drivers/pinctrl/bcm/pinctrl-bcm281xx.c             | 1455 ++++++++++++++++++++
 drivers/pinctrl/bcm/pinctrl-bcm2835.c              | 1072 ++++++++++++++
 drivers/pinctrl/bcm/pinctrl-cygnus-mux.c           | 1088 +++++++++++++++
 drivers/pinctrl/pinctrl-bcm281xx.c                 | 1455 --------------------
 drivers/pinctrl/pinctrl-bcm2835.c                  | 1072 --------------
 11 files changed, 3820 insertions(+), 2547 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinmux.txt
 create mode 100644 drivers/pinctrl/bcm/Kconfig
 create mode 100644 drivers/pinctrl/bcm/Makefile
 create mode 100644 drivers/pinctrl/bcm/pinctrl-bcm281xx.c
 create mode 100644 drivers/pinctrl/bcm/pinctrl-bcm2835.c
 create mode 100644 drivers/pinctrl/bcm/pinctrl-cygnus-mux.c
 delete mode 100644 drivers/pinctrl/pinctrl-bcm281xx.c
 delete mode 100644 drivers/pinctrl/pinctrl-bcm2835.c

-- 
1.7.9.5

--
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[PATCH v4 0/4] Add pinctrl support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial pinctrl (IOMUX) support for the Broadcom
Cygnus SoC. The Cygnus IOMUX controller supports group based mux configuration
and allows certain pins to be muxed to GPIO function individually

Changes from v3:
 - Fix the driver to have more proper use of "const" in various places
 - Other minor improvements

Changes from v2:
 - Consolidate all Broadcom pinctrl drivers into drivers/pinctrl/bcm/*
 - Change the Cygnus IOMUX driver to use standard Linux pinctrl subnode
properties such as "function" and "groups" for pinmux configuration, instead
of non-standard properties such as "brcm,function" and "brcm,group"
 - Use real function names like "spi0", "lcd", "key", and etc. instead of HW
specific mux names like "alt1", "alt2", "alt3", and etc.
 - Add suffix "grp" to all group names
 - Add support to allow individual pins to be muxed to GPIO function through
subsystem callbacks "gpio_request_enable" and "gpio_disable_free", and get rid
of all GPIO groups
 - Other minor improvements in the driver

Changes from v1:
 - Fix a typo in device tree binding document

Ray Jui (4):
  pinctrl: bcm: consolidate Broadcom pinctrl drivers
  pinctrl: Broadcom Cygnus pinctrl device tree binding
  pinctrl: cygnus: add initial IOMUX driver support
  ARM: dts: enable IOMUX for Broadcom Cygnus

 .../bindings/pinctrl/brcm,cygnus-pinmux.txt        |  157 +++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |    6 +
 drivers/pinctrl/Kconfig                            |   19 +-
 drivers/pinctrl/Makefile                           |    4 +-
 drivers/pinctrl/bcm/Kconfig                        |   34 +
 drivers/pinctrl/bcm/Makefile                       |    5 +
 drivers/pinctrl/bcm/pinctrl-bcm281xx.c             | 1455 ++++++++++++++++++++
 drivers/pinctrl/bcm/pinctrl-bcm2835.c              | 1072 ++++++++++++++
 drivers/pinctrl/bcm/pinctrl-cygnus-mux.c           | 1088 +++++++++++++++
 drivers/pinctrl/pinctrl-bcm281xx.c                 | 1455 --------------------
 drivers/pinctrl/pinctrl-bcm2835.c                  | 1072 --------------
 11 files changed, 3820 insertions(+), 2547 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinmux.txt
 create mode 100644 drivers/pinctrl/bcm/Kconfig
 create mode 100644 drivers/pinctrl/bcm/Makefile
 create mode 100644 drivers/pinctrl/bcm/pinctrl-bcm281xx.c
 create mode 100644 drivers/pinctrl/bcm/pinctrl-bcm2835.c
 create mode 100644 drivers/pinctrl/bcm/pinctrl-cygnus-mux.c
 delete mode 100644 drivers/pinctrl/pinctrl-bcm281xx.c
 delete mode 100644 drivers/pinctrl/pinctrl-bcm2835.c

-- 
1.7.9.5

[PATCH v4 0/4] Add pinctrl support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial pinctrl (IOMUX) support for the Broadcom
Cygnus SoC. The Cygnus IOMUX controller supports group based mux configuration
and allows certain pins to be muxed to GPIO function individually

Changes from v3:
 - Fix the driver to have more proper use of "const" in various places
 - Other minor improvements

Changes from v2:
 - Consolidate all Broadcom pinctrl drivers into drivers/pinctrl/bcm/*
 - Change the Cygnus IOMUX driver to use standard Linux pinctrl subnode
properties such as "function" and "groups" for pinmux configuration, instead
of non-standard properties such as "brcm,function" and "brcm,group"
 - Use real function names like "spi0", "lcd", "key", and etc. instead of HW
specific mux names like "alt1", "alt2", "alt3", and etc.
 - Add suffix "grp" to all group names
 - Add support to allow individual pins to be muxed to GPIO function through
subsystem callbacks "gpio_request_enable" and "gpio_disable_free", and get rid
of all GPIO groups
 - Other minor improvements in the driver

Changes from v1:
 - Fix a typo in device tree binding document

Ray Jui (4):
  pinctrl: bcm: consolidate Broadcom pinctrl drivers
  pinctrl: Broadcom Cygnus pinctrl device tree binding
  pinctrl: cygnus: add initial IOMUX driver support
  ARM: dts: enable IOMUX for Broadcom Cygnus

 .../bindings/pinctrl/brcm,cygnus-pinmux.txt        |  157 +++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |    6 +
 drivers/pinctrl/Kconfig                            |   19 +-
 drivers/pinctrl/Makefile                           |    4 +-
 drivers/pinctrl/bcm/Kconfig                        |   34 +
 drivers/pinctrl/bcm/Makefile                       |    5 +
 drivers/pinctrl/bcm/pinctrl-bcm281xx.c             | 1455 ++++++++++++++++++++
 drivers/pinctrl/bcm/pinctrl-bcm2835.c              | 1072 ++++++++++++++
 drivers/pinctrl/bcm/pinctrl-cygnus-mux.c           | 1088 +++++++++++++++
 drivers/pinctrl/pinctrl-bcm281xx.c                 | 1455 --------------------
 drivers/pinctrl/pinctrl-bcm2835.c                  | 1072 --------------
 11 files changed, 3820 insertions(+), 2547 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinmux.txt
 create mode 100644 drivers/pinctrl/bcm/Kconfig
 create mode 100644 drivers/pinctrl/bcm/Makefile
 create mode 100644 drivers/pinctrl/bcm/pinctrl-bcm281xx.c
 create mode 100644 drivers/pinctrl/bcm/pinctrl-bcm2835.c
 create mode 100644 drivers/pinctrl/bcm/pinctrl-cygnus-mux.c
 delete mode 100644 drivers/pinctrl/pinctrl-bcm281xx.c
 delete mode 100644 drivers/pinctrl/pinctrl-bcm2835.c

-- 
1.7.9.5

[PATCH v4 1/4] pinctrl: bcm: consolidate Broadcom pinctrl drivers

[Ray Jui]

Consolidate Broadcom pinctrl drivers into drivers/pinctrl/bcm/*

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 drivers/pinctrl/Kconfig                |   19 +-
 drivers/pinctrl/Makefile               |    4 +-
 drivers/pinctrl/bcm/Kconfig            |   21 +
 drivers/pinctrl/bcm/Makefile           |    4 +
 drivers/pinctrl/bcm/pinctrl-bcm281xx.c | 1455 ++++++++++++++++++++++++++++++++
 drivers/pinctrl/bcm/pinctrl-bcm2835.c  | 1072 +++++++++++++++++++++++
 drivers/pinctrl/pinctrl-bcm281xx.c     | 1455 --------------------------------
 drivers/pinctrl/pinctrl-bcm2835.c      | 1072 -----------------------
 8 files changed, 2555 insertions(+), 2547 deletions(-)
 create mode 100644 drivers/pinctrl/bcm/Kconfig
 create mode 100644 drivers/pinctrl/bcm/Makefile
 create mode 100644 drivers/pinctrl/bcm/pinctrl-bcm281xx.c
 create mode 100644 drivers/pinctrl/bcm/pinctrl-bcm2835.c
 delete mode 100644 drivers/pinctrl/pinctrl-bcm281xx.c
 delete mode 100644 drivers/pinctrl/pinctrl-bcm2835.c

diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index d014f22..6cfdad7 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -67,24 +67,6 @@ config PINCTRL_AT91
 	help
 	  Say Y here to enable the at91 pinctrl driver
 
-config PINCTRL_BCM2835
-	bool
-	select PINMUX
-	select PINCONF
-
-config PINCTRL_BCM281XX
-	bool "Broadcom BCM281xx pinctrl driver"
-	depends on OF && (ARCH_BCM_MOBILE || COMPILE_TEST)
-	select PINMUX
-	select PINCONF
-	select GENERIC_PINCONF
-	select REGMAP_MMIO
-	help
-	  Say Y here to support Broadcom BCM281xx pinctrl driver, which is used
-	  for the BCM281xx SoC family, including BCM11130, BCM11140, BCM11351,
-	  BCM28145, and BCM28155 SoCs.  This driver requires the pinctrl
-	  framework.  GPIO is provided by a separate GPIO driver.
-
 config PINCTRL_LANTIQ
 	bool
 	depends on LANTIQ
@@ -191,6 +173,7 @@ config PINCTRL_PALMAS
 	  open drain configuration for the Palmas series devices like
 	  TPS65913, TPS80036 etc.
 
+source "drivers/pinctrl/bcm/Kconfig"
 source "drivers/pinctrl/berlin/Kconfig"
 source "drivers/pinctrl/freescale/Kconfig"
 source "drivers/pinctrl/intel/Kconfig"
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index c030b3d..c018bbf 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -14,8 +14,6 @@ obj-$(CONFIG_PINCTRL_AS3722)	+= pinctrl-as3722.o
 obj-$(CONFIG_PINCTRL_BF54x)	+= pinctrl-adi2-bf54x.o
 obj-$(CONFIG_PINCTRL_BF60x)	+= pinctrl-adi2-bf60x.o
 obj-$(CONFIG_PINCTRL_AT91)	+= pinctrl-at91.o
-obj-$(CONFIG_PINCTRL_BCM2835)	+= pinctrl-bcm2835.o
-obj-$(CONFIG_PINCTRL_BCM281XX)	+= pinctrl-bcm281xx.o
 obj-$(CONFIG_PINCTRL_FALCON)	+= pinctrl-falcon.o
 obj-$(CONFIG_PINCTRL_PALMAS)	+= pinctrl-palmas.o
 obj-$(CONFIG_PINCTRL_ROCKCHIP)	+= pinctrl-rockchip.o
@@ -36,6 +34,8 @@ obj-$(CONFIG_PINCTRL_LANTIQ)	+= pinctrl-lantiq.o
 obj-$(CONFIG_PINCTRL_TB10X)	+= pinctrl-tb10x.o
 obj-$(CONFIG_PINCTRL_ST) 	+= pinctrl-st.o
 
+obj-$(CONFIG_ARCH_BCM)		+= bcm/
+obj-$(CONFIG_ARCH_BCM2835)	+= bcm/
 obj-$(CONFIG_ARCH_BERLIN)	+= berlin/
 obj-y				+= freescale/
 obj-$(CONFIG_X86)		+= intel/
diff --git a/drivers/pinctrl/bcm/Kconfig b/drivers/pinctrl/bcm/Kconfig
new file mode 100644
index 0000000..bc6d048
--- /dev/null
+++ b/drivers/pinctrl/bcm/Kconfig
@@ -0,0 +1,21 @@
+#
+# Broadcom pinctrl drivers
+#
+
+config PINCTRL_BCM281XX
+	bool "Broadcom BCM281xx pinctrl driver"
+	depends on OF && (ARCH_BCM_MOBILE || COMPILE_TEST)
+	select PINMUX
+	select PINCONF
+	select GENERIC_PINCONF
+	select REGMAP_MMIO
+	help
+	  Say Y here to support Broadcom BCM281xx pinctrl driver, which is used
+	  for the BCM281xx SoC family, including BCM11130, BCM11140, BCM11351,
+	  BCM28145, and BCM28155 SoCs.  This driver requires the pinctrl
+	  framework.  GPIO is provided by a separate GPIO driver.
+
+config PINCTRL_BCM2835
+	bool
+	select PINMUX
+	select PINCONF
diff --git a/drivers/pinctrl/bcm/Makefile b/drivers/pinctrl/bcm/Makefile
new file mode 100644
index 0000000..7ba80a3
--- /dev/null
+++ b/drivers/pinctrl/bcm/Makefile
@@ -0,0 +1,4 @@
+# Broadcom pinctrl support
+
+obj-$(CONFIG_PINCTRL_BCM281XX)	+= pinctrl-bcm281xx.o
+obj-$(CONFIG_PINCTRL_BCM2835)	+= pinctrl-bcm2835.o
diff --git a/drivers/pinctrl/bcm/pinctrl-bcm281xx.c b/drivers/pinctrl/bcm/pinctrl-bcm281xx.c
new file mode 100644
index 0000000..73d99076
--- /dev/null
+++ b/drivers/pinctrl/bcm/pinctrl-bcm281xx.c
@@ -0,0 +1,1455 @@
+/*
+ * Copyright (C) 2013 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include "../core.h"
+#include "../pinctrl-utils.h"
+
+/* BCM281XX Pin Control Registers Definitions */
+
+/* Function Select bits are the same for all pin control registers */
+#define BCM281XX_PIN_REG_F_SEL_MASK		0x0700
+#define BCM281XX_PIN_REG_F_SEL_SHIFT		8
+
+/* Standard pin register */
+#define BCM281XX_STD_PIN_REG_DRV_STR_MASK	0x0007
+#define BCM281XX_STD_PIN_REG_DRV_STR_SHIFT	0
+#define BCM281XX_STD_PIN_REG_INPUT_DIS_MASK	0x0008
+#define BCM281XX_STD_PIN_REG_INPUT_DIS_SHIFT	3
+#define BCM281XX_STD_PIN_REG_SLEW_MASK		0x0010
+#define BCM281XX_STD_PIN_REG_SLEW_SHIFT		4
+#define BCM281XX_STD_PIN_REG_PULL_UP_MASK	0x0020
+#define BCM281XX_STD_PIN_REG_PULL_UP_SHIFT	5
+#define BCM281XX_STD_PIN_REG_PULL_DN_MASK	0x0040
+#define BCM281XX_STD_PIN_REG_PULL_DN_SHIFT	6
+#define BCM281XX_STD_PIN_REG_HYST_MASK		0x0080
+#define BCM281XX_STD_PIN_REG_HYST_SHIFT		7
+
+/* I2C pin register */
+#define BCM281XX_I2C_PIN_REG_INPUT_DIS_MASK	0x0004
+#define BCM281XX_I2C_PIN_REG_INPUT_DIS_SHIFT	2
+#define BCM281XX_I2C_PIN_REG_SLEW_MASK		0x0008
+#define BCM281XX_I2C_PIN_REG_SLEW_SHIFT		3
+#define BCM281XX_I2C_PIN_REG_PULL_UP_STR_MASK	0x0070
+#define BCM281XX_I2C_PIN_REG_PULL_UP_STR_SHIFT	4
+
+/* HDMI pin register */
+#define BCM281XX_HDMI_PIN_REG_INPUT_DIS_MASK	0x0008
+#define BCM281XX_HDMI_PIN_REG_INPUT_DIS_SHIFT	3
+#define BCM281XX_HDMI_PIN_REG_MODE_MASK		0x0010
+#define BCM281XX_HDMI_PIN_REG_MODE_SHIFT	4
+
+/**
+ * bcm281xx_pin_type - types of pin register
+ */
+enum bcm281xx_pin_type {
+	BCM281XX_PIN_TYPE_UNKNOWN = 0,
+	BCM281XX_PIN_TYPE_STD,
+	BCM281XX_PIN_TYPE_I2C,
+	BCM281XX_PIN_TYPE_HDMI,
+};
+
+static enum bcm281xx_pin_type std_pin = BCM281XX_PIN_TYPE_STD;
+static enum bcm281xx_pin_type i2c_pin = BCM281XX_PIN_TYPE_I2C;
+static enum bcm281xx_pin_type hdmi_pin = BCM281XX_PIN_TYPE_HDMI;
+
+/**
+ * bcm281xx_pin_function- define pin function
+ */
+struct bcm281xx_pin_function {
+	const char *name;
+	const char * const *groups;
+	const unsigned ngroups;
+};
+
+/**
+ * bcm281xx_pinctrl_data - Broadcom-specific pinctrl data
+ * @reg_base - base of pinctrl registers
+ */
+struct bcm281xx_pinctrl_data {
+	void __iomem *reg_base;
+
+	/* List of all pins */
+	const struct pinctrl_pin_desc *pins;
+	const unsigned npins;
+
+	const struct bcm281xx_pin_function *functions;
+	const unsigned nfunctions;
+
+	struct regmap *regmap;
+};
+
+/*
+ * Pin number definition.  The order here must be the same as defined in the
+ * PADCTRLREG block in the RDB.
+ */
+#define BCM281XX_PIN_ADCSYNC		0
+#define BCM281XX_PIN_BAT_RM		1
+#define BCM281XX_PIN_BSC1_SCL		2
+#define BCM281XX_PIN_BSC1_SDA		3
+#define BCM281XX_PIN_BSC2_SCL		4
+#define BCM281XX_PIN_BSC2_SDA		5
+#define BCM281XX_PIN_CLASSGPWR		6
+#define BCM281XX_PIN_CLK_CX8		7
+#define BCM281XX_PIN_CLKOUT_0		8
+#define BCM281XX_PIN_CLKOUT_1		9
+#define BCM281XX_PIN_CLKOUT_2		10
+#define BCM281XX_PIN_CLKOUT_3		11
+#define BCM281XX_PIN_CLKREQ_IN_0	12
+#define BCM281XX_PIN_CLKREQ_IN_1	13
+#define BCM281XX_PIN_CWS_SYS_REQ1	14
+#define BCM281XX_PIN_CWS_SYS_REQ2	15
+#define BCM281XX_PIN_CWS_SYS_REQ3	16
+#define BCM281XX_PIN_DIGMIC1_CLK	17
+#define BCM281XX_PIN_DIGMIC1_DQ		18
+#define BCM281XX_PIN_DIGMIC2_CLK	19
+#define BCM281XX_PIN_DIGMIC2_DQ		20
+#define BCM281XX_PIN_GPEN13		21
+#define BCM281XX_PIN_GPEN14		22
+#define BCM281XX_PIN_GPEN15		23
+#define BCM281XX_PIN_GPIO00		24
+#define BCM281XX_PIN_GPIO01		25
+#define BCM281XX_PIN_GPIO02		26
+#define BCM281XX_PIN_GPIO03		27
+#define BCM281XX_PIN_GPIO04		28
+#define BCM281XX_PIN_GPIO05		29
+#define BCM281XX_PIN_GPIO06		30
+#define BCM281XX_PIN_GPIO07		31
+#define BCM281XX_PIN_GPIO08		32
+#define BCM281XX_PIN_GPIO09		33
+#define BCM281XX_PIN_GPIO10		34
+#define BCM281XX_PIN_GPIO11		35
+#define BCM281XX_PIN_GPIO12		36
+#define BCM281XX_PIN_GPIO13		37
+#define BCM281XX_PIN_GPIO14		38
+#define BCM281XX_PIN_GPS_PABLANK	39
+#define BCM281XX_PIN_GPS_TMARK		40
+#define BCM281XX_PIN_HDMI_SCL		41
+#define BCM281XX_PIN_HDMI_SDA		42
+#define BCM281XX_PIN_IC_DM		43
+#define BCM281XX_PIN_IC_DP		44
+#define BCM281XX_PIN_KP_COL_IP_0	45
+#define BCM281XX_PIN_KP_COL_IP_1	46
+#define BCM281XX_PIN_KP_COL_IP_2	47
+#define BCM281XX_PIN_KP_COL_IP_3	48
+#define BCM281XX_PIN_KP_ROW_OP_0	49
+#define BCM281XX_PIN_KP_ROW_OP_1	50
+#define BCM281XX_PIN_KP_ROW_OP_2	51
+#define BCM281XX_PIN_KP_ROW_OP_3	52
+#define BCM281XX_PIN_LCD_B_0		53
+#define BCM281XX_PIN_LCD_B_1		54
+#define BCM281XX_PIN_LCD_B_2		55
+#define BCM281XX_PIN_LCD_B_3		56
+#define BCM281XX_PIN_LCD_B_4		57
+#define BCM281XX_PIN_LCD_B_5		58
+#define BCM281XX_PIN_LCD_B_6		59
+#define BCM281XX_PIN_LCD_B_7		60
+#define BCM281XX_PIN_LCD_G_0		61
+#define BCM281XX_PIN_LCD_G_1		62
+#define BCM281XX_PIN_LCD_G_2		63
+#define BCM281XX_PIN_LCD_G_3		64
+#define BCM281XX_PIN_LCD_G_4		65
+#define BCM281XX_PIN_LCD_G_5		66
+#define BCM281XX_PIN_LCD_G_6		67
+#define BCM281XX_PIN_LCD_G_7		68
+#define BCM281XX_PIN_LCD_HSYNC		69
+#define BCM281XX_PIN_LCD_OE		70
+#define BCM281XX_PIN_LCD_PCLK		71
+#define BCM281XX_PIN_LCD_R_0		72
+#define BCM281XX_PIN_LCD_R_1		73
+#define BCM281XX_PIN_LCD_R_2		74
+#define BCM281XX_PIN_LCD_R_3		75
+#define BCM281XX_PIN_LCD_R_4		76
+#define BCM281XX_PIN_LCD_R_5		77
+#define BCM281XX_PIN_LCD_R_6		78
+#define BCM281XX_PIN_LCD_R_7		79
+#define BCM281XX_PIN_LCD_VSYNC		80
+#define BCM281XX_PIN_MDMGPIO0		81
+#define BCM281XX_PIN_MDMGPIO1		82
+#define BCM281XX_PIN_MDMGPIO2		83
+#define BCM281XX_PIN_MDMGPIO3		84
+#define BCM281XX_PIN_MDMGPIO4		85
+#define BCM281XX_PIN_MDMGPIO5		86
+#define BCM281XX_PIN_MDMGPIO6		87
+#define BCM281XX_PIN_MDMGPIO7		88
+#define BCM281XX_PIN_MDMGPIO8		89
+#define BCM281XX_PIN_MPHI_DATA_0	90
+#define BCM281XX_PIN_MPHI_DATA_1	91
+#define BCM281XX_PIN_MPHI_DATA_2	92
+#define BCM281XX_PIN_MPHI_DATA_3	93
+#define BCM281XX_PIN_MPHI_DATA_4	94
+#define BCM281XX_PIN_MPHI_DATA_5	95
+#define BCM281XX_PIN_MPHI_DATA_6	96
+#define BCM281XX_PIN_MPHI_DATA_7	97
+#define BCM281XX_PIN_MPHI_DATA_8	98
+#define BCM281XX_PIN_MPHI_DATA_9	99
+#define BCM281XX_PIN_MPHI_DATA_10	100
+#define BCM281XX_PIN_MPHI_DATA_11	101
+#define BCM281XX_PIN_MPHI_DATA_12	102
+#define BCM281XX_PIN_MPHI_DATA_13	103
+#define BCM281XX_PIN_MPHI_DATA_14	104
+#define BCM281XX_PIN_MPHI_DATA_15	105
+#define BCM281XX_PIN_MPHI_HA0		106
+#define BCM281XX_PIN_MPHI_HAT0		107
+#define BCM281XX_PIN_MPHI_HAT1		108
+#define BCM281XX_PIN_MPHI_HCE0_N	109
+#define BCM281XX_PIN_MPHI_HCE1_N	110
+#define BCM281XX_PIN_MPHI_HRD_N		111
+#define BCM281XX_PIN_MPHI_HWR_N		112
+#define BCM281XX_PIN_MPHI_RUN0		113
+#define BCM281XX_PIN_MPHI_RUN1		114
+#define BCM281XX_PIN_MTX_SCAN_CLK	115
+#define BCM281XX_PIN_MTX_SCAN_DATA	116
+#define BCM281XX_PIN_NAND_AD_0		117
+#define BCM281XX_PIN_NAND_AD_1		118
+#define BCM281XX_PIN_NAND_AD_2		119
+#define BCM281XX_PIN_NAND_AD_3		120
+#define BCM281XX_PIN_NAND_AD_4		121
+#define BCM281XX_PIN_NAND_AD_5		122
+#define BCM281XX_PIN_NAND_AD_6		123
+#define BCM281XX_PIN_NAND_AD_7		124
+#define BCM281XX_PIN_NAND_ALE		125
+#define BCM281XX_PIN_NAND_CEN_0		126
+#define BCM281XX_PIN_NAND_CEN_1		127
+#define BCM281XX_PIN_NAND_CLE		128
+#define BCM281XX_PIN_NAND_OEN		129
+#define BCM281XX_PIN_NAND_RDY_0		130
+#define BCM281XX_PIN_NAND_RDY_1		131
+#define BCM281XX_PIN_NAND_WEN		132
+#define BCM281XX_PIN_NAND_WP		133
+#define BCM281XX_PIN_PC1		134
+#define BCM281XX_PIN_PC2		135
+#define BCM281XX_PIN_PMU_INT		136
+#define BCM281XX_PIN_PMU_SCL		137
+#define BCM281XX_PIN_PMU_SDA		138
+#define BCM281XX_PIN_RFST2G_MTSLOTEN3G	139
+#define BCM281XX_PIN_RGMII_0_RX_CTL	140
+#define BCM281XX_PIN_RGMII_0_RXC	141
+#define BCM281XX_PIN_RGMII_0_RXD_0	142
+#define BCM281XX_PIN_RGMII_0_RXD_1	143
+#define BCM281XX_PIN_RGMII_0_RXD_2	144
+#define BCM281XX_PIN_RGMII_0_RXD_3	145
+#define BCM281XX_PIN_RGMII_0_TX_CTL	146
+#define BCM281XX_PIN_RGMII_0_TXC	147
+#define BCM281XX_PIN_RGMII_0_TXD_0	148
+#define BCM281XX_PIN_RGMII_0_TXD_1	149
+#define BCM281XX_PIN_RGMII_0_TXD_2	150
+#define BCM281XX_PIN_RGMII_0_TXD_3	151
+#define BCM281XX_PIN_RGMII_1_RX_CTL	152
+#define BCM281XX_PIN_RGMII_1_RXC	153
+#define BCM281XX_PIN_RGMII_1_RXD_0	154
+#define BCM281XX_PIN_RGMII_1_RXD_1	155
+#define BCM281XX_PIN_RGMII_1_RXD_2	156
+#define BCM281XX_PIN_RGMII_1_RXD_3	157
+#define BCM281XX_PIN_RGMII_1_TX_CTL	158
+#define BCM281XX_PIN_RGMII_1_TXC	159
+#define BCM281XX_PIN_RGMII_1_TXD_0	160
+#define BCM281XX_PIN_RGMII_1_TXD_1	161
+#define BCM281XX_PIN_RGMII_1_TXD_2	162
+#define BCM281XX_PIN_RGMII_1_TXD_3	163
+#define BCM281XX_PIN_RGMII_GPIO_0	164
+#define BCM281XX_PIN_RGMII_GPIO_1	165
+#define BCM281XX_PIN_RGMII_GPIO_2	166
+#define BCM281XX_PIN_RGMII_GPIO_3	167
+#define BCM281XX_PIN_RTXDATA2G_TXDATA3G1	168
+#define BCM281XX_PIN_RTXEN2G_TXDATA3G2	169
+#define BCM281XX_PIN_RXDATA3G0		170
+#define BCM281XX_PIN_RXDATA3G1		171
+#define BCM281XX_PIN_RXDATA3G2		172
+#define BCM281XX_PIN_SDIO1_CLK		173
+#define BCM281XX_PIN_SDIO1_CMD		174
+#define BCM281XX_PIN_SDIO1_DATA_0	175
+#define BCM281XX_PIN_SDIO1_DATA_1	176
+#define BCM281XX_PIN_SDIO1_DATA_2	177
+#define BCM281XX_PIN_SDIO1_DATA_3	178
+#define BCM281XX_PIN_SDIO4_CLK		179
+#define BCM281XX_PIN_SDIO4_CMD		180
+#define BCM281XX_PIN_SDIO4_DATA_0	181
+#define BCM281XX_PIN_SDIO4_DATA_1	182
+#define BCM281XX_PIN_SDIO4_DATA_2	183
+#define BCM281XX_PIN_SDIO4_DATA_3	184
+#define BCM281XX_PIN_SIM_CLK		185
+#define BCM281XX_PIN_SIM_DATA		186
+#define BCM281XX_PIN_SIM_DET		187
+#define BCM281XX_PIN_SIM_RESETN		188
+#define BCM281XX_PIN_SIM2_CLK		189
+#define BCM281XX_PIN_SIM2_DATA		190
+#define BCM281XX_PIN_SIM2_DET		191
+#define BCM281XX_PIN_SIM2_RESETN	192
+#define BCM281XX_PIN_SRI_C		193
+#define BCM281XX_PIN_SRI_D		194
+#define BCM281XX_PIN_SRI_E		195
+#define BCM281XX_PIN_SSP_EXTCLK		196
+#define BCM281XX_PIN_SSP0_CLK		197
+#define BCM281XX_PIN_SSP0_FS		198
+#define BCM281XX_PIN_SSP0_RXD		199
+#define BCM281XX_PIN_SSP0_TXD		200
+#define BCM281XX_PIN_SSP2_CLK		201
+#define BCM281XX_PIN_SSP2_FS_0		202
+#define BCM281XX_PIN_SSP2_FS_1		203
+#define BCM281XX_PIN_SSP2_FS_2		204
+#define BCM281XX_PIN_SSP2_FS_3		205
+#define BCM281XX_PIN_SSP2_RXD_0		206
+#define BCM281XX_PIN_SSP2_RXD_1		207
+#define BCM281XX_PIN_SSP2_TXD_0		208
+#define BCM281XX_PIN_SSP2_TXD_1		209
+#define BCM281XX_PIN_SSP3_CLK		210
+#define BCM281XX_PIN_SSP3_FS		211
+#define BCM281XX_PIN_SSP3_RXD		212
+#define BCM281XX_PIN_SSP3_TXD		213
+#define BCM281XX_PIN_SSP4_CLK		214
+#define BCM281XX_PIN_SSP4_FS		215
+#define BCM281XX_PIN_SSP4_RXD		216
+#define BCM281XX_PIN_SSP4_TXD		217
+#define BCM281XX_PIN_SSP5_CLK		218
+#define BCM281XX_PIN_SSP5_FS		219
+#define BCM281XX_PIN_SSP5_RXD		220
+#define BCM281XX_PIN_SSP5_TXD		221
+#define BCM281XX_PIN_SSP6_CLK		222
+#define BCM281XX_PIN_SSP6_FS		223
+#define BCM281XX_PIN_SSP6_RXD		224
+#define BCM281XX_PIN_SSP6_TXD		225
+#define BCM281XX_PIN_STAT_1		226
+#define BCM281XX_PIN_STAT_2		227
+#define BCM281XX_PIN_SYSCLKEN		228
+#define BCM281XX_PIN_TRACECLK		229
+#define BCM281XX_PIN_TRACEDT00		230
+#define BCM281XX_PIN_TRACEDT01		231
+#define BCM281XX_PIN_TRACEDT02		232
+#define BCM281XX_PIN_TRACEDT03		233
+#define BCM281XX_PIN_TRACEDT04		234
+#define BCM281XX_PIN_TRACEDT05		235
+#define BCM281XX_PIN_TRACEDT06		236
+#define BCM281XX_PIN_TRACEDT07		237
+#define BCM281XX_PIN_TRACEDT08		238
+#define BCM281XX_PIN_TRACEDT09		239
+#define BCM281XX_PIN_TRACEDT10		240
+#define BCM281XX_PIN_TRACEDT11		241
+#define BCM281XX_PIN_TRACEDT12		242
+#define BCM281XX_PIN_TRACEDT13		243
+#define BCM281XX_PIN_TRACEDT14		244
+#define BCM281XX_PIN_TRACEDT15		245
+#define BCM281XX_PIN_TXDATA3G0		246
+#define BCM281XX_PIN_TXPWRIND		247
+#define BCM281XX_PIN_UARTB1_UCTS	248
+#define BCM281XX_PIN_UARTB1_URTS	249
+#define BCM281XX_PIN_UARTB1_URXD	250
+#define BCM281XX_PIN_UARTB1_UTXD	251
+#define BCM281XX_PIN_UARTB2_URXD	252
+#define BCM281XX_PIN_UARTB2_UTXD	253
+#define BCM281XX_PIN_UARTB3_UCTS	254
+#define BCM281XX_PIN_UARTB3_URTS	255
+#define BCM281XX_PIN_UARTB3_URXD	256
+#define BCM281XX_PIN_UARTB3_UTXD	257
+#define BCM281XX_PIN_UARTB4_UCTS	258
+#define BCM281XX_PIN_UARTB4_URTS	259
+#define BCM281XX_PIN_UARTB4_URXD	260
+#define BCM281XX_PIN_UARTB4_UTXD	261
+#define BCM281XX_PIN_VC_CAM1_SCL	262
+#define BCM281XX_PIN_VC_CAM1_SDA	263
+#define BCM281XX_PIN_VC_CAM2_SCL	264
+#define BCM281XX_PIN_VC_CAM2_SDA	265
+#define BCM281XX_PIN_VC_CAM3_SCL	266
+#define BCM281XX_PIN_VC_CAM3_SDA	267
+
+#define BCM281XX_PIN_DESC(a, b, c) \
+	{ .number = a, .name = b, .drv_data = &c##_pin }
+
+/*
+ * Pin description definition.  The order here must be the same as defined in
+ * the PADCTRLREG block in the RDB, since the pin number is used as an index
+ * into this array.
+ */
+static const struct pinctrl_pin_desc bcm281xx_pinctrl_pins[] = {
+	BCM281XX_PIN_DESC(BCM281XX_PIN_ADCSYNC, "adcsync", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_BAT_RM, "bat_rm", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_BSC1_SCL, "bsc1_scl", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_BSC1_SDA, "bsc1_sda", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_BSC2_SCL, "bsc2_scl", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_BSC2_SDA, "bsc2_sda", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CLASSGPWR, "classgpwr", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CLK_CX8, "clk_cx8", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKOUT_0, "clkout_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKOUT_1, "clkout_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKOUT_2, "clkout_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKOUT_3, "clkout_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKREQ_IN_0, "clkreq_in_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKREQ_IN_1, "clkreq_in_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CWS_SYS_REQ1, "cws_sys_req1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CWS_SYS_REQ2, "cws_sys_req2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CWS_SYS_REQ3, "cws_sys_req3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_DIGMIC1_CLK, "digmic1_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_DIGMIC1_DQ, "digmic1_dq", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_DIGMIC2_CLK, "digmic2_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_DIGMIC2_DQ, "digmic2_dq", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPEN13, "gpen13", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPEN14, "gpen14", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPEN15, "gpen15", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO00, "gpio00", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO01, "gpio01", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO02, "gpio02", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO03, "gpio03", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO04, "gpio04", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO05, "gpio05", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO06, "gpio06", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO07, "gpio07", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO08, "gpio08", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO09, "gpio09", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO10, "gpio10", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO11, "gpio11", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO12, "gpio12", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO13, "gpio13", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO14, "gpio14", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPS_PABLANK, "gps_pablank", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPS_TMARK, "gps_tmark", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_HDMI_SCL, "hdmi_scl", hdmi),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_HDMI_SDA, "hdmi_sda", hdmi),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_IC_DM, "ic_dm", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_IC_DP, "ic_dp", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_COL_IP_0, "kp_col_ip_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_COL_IP_1, "kp_col_ip_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_COL_IP_2, "kp_col_ip_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_COL_IP_3, "kp_col_ip_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_ROW_OP_0, "kp_row_op_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_ROW_OP_1, "kp_row_op_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_ROW_OP_2, "kp_row_op_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_ROW_OP_3, "kp_row_op_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_0, "lcd_b_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_1, "lcd_b_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_2, "lcd_b_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_3, "lcd_b_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_4, "lcd_b_4", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_5, "lcd_b_5", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_6, "lcd_b_6", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_7, "lcd_b_7", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_0, "lcd_g_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_1, "lcd_g_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_2, "lcd_g_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_3, "lcd_g_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_4, "lcd_g_4", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_5, "lcd_g_5", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_6, "lcd_g_6", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_7, "lcd_g_7", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_HSYNC, "lcd_hsync", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_OE, "lcd_oe", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_PCLK, "lcd_pclk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_0, "lcd_r_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_1, "lcd_r_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_2, "lcd_r_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_3, "lcd_r_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_4, "lcd_r_4", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_5, "lcd_r_5", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_6, "lcd_r_6", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_7, "lcd_r_7", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_VSYNC, "lcd_vsync", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO0, "mdmgpio0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO1, "mdmgpio1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO2, "mdmgpio2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO3, "mdmgpio3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO4, "mdmgpio4", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO5, "mdmgpio5", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO6, "mdmgpio6", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO7, "mdmgpio7", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO8, "mdmgpio8", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_0, "mphi_data_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_1, "mphi_data_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_2, "mphi_data_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_3, "mphi_data_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_4, "mphi_data_4", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_5, "mphi_data_5", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_6, "mphi_data_6", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_7, "mphi_data_7", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_8, "mphi_data_8", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_9, "mphi_data_9", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_10, "mphi_data_10", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_11, "mphi_data_11", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_12, "mphi_data_12", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_13, "mphi_data_13", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_14, "mphi_data_14", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_15, "mphi_data_15", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HA0, "mphi_ha0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HAT0, "mphi_hat0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HAT1, "mphi_hat1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HCE0_N, "mphi_hce0_n", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HCE1_N, "mphi_hce1_n", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HRD_N, "mphi_hrd_n", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HWR_N, "mphi_hwr_n", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_RUN0, "mphi_run0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_RUN1, "mphi_run1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MTX_SCAN_CLK, "mtx_scan_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MTX_SCAN_DATA, "mtx_scan_data", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_0, "nand_ad_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_1, "nand_ad_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_2, "nand_ad_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_3, "nand_ad_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_4, "nand_ad_4", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_5, "nand_ad_5", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_6, "nand_ad_6", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_7, "nand_ad_7", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_ALE, "nand_ale", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_CEN_0, "nand_cen_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_CEN_1, "nand_cen_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_CLE, "nand_cle", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_OEN, "nand_oen", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_RDY_0, "nand_rdy_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_RDY_1, "nand_rdy_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_WEN, "nand_wen", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_WP, "nand_wp", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_PC1, "pc1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_PC2, "pc2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_PMU_INT, "pmu_int", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_PMU_SCL, "pmu_scl", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_PMU_SDA, "pmu_sda", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RFST2G_MTSLOTEN3G, "rfst2g_mtsloten3g",
+		std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RX_CTL, "rgmii_0_rx_ctl", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXC, "rgmii_0_rxc", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXD_0, "rgmii_0_rxd_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXD_1, "rgmii_0_rxd_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXD_2, "rgmii_0_rxd_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXD_3, "rgmii_0_rxd_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TX_CTL, "rgmii_0_tx_ctl", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXC, "rgmii_0_txc", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXD_0, "rgmii_0_txd_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXD_1, "rgmii_0_txd_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXD_2, "rgmii_0_txd_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXD_3, "rgmii_0_txd_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RX_CTL, "rgmii_1_rx_ctl", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXC, "rgmii_1_rxc", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXD_0, "rgmii_1_rxd_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXD_1, "rgmii_1_rxd_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXD_2, "rgmii_1_rxd_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXD_3, "rgmii_1_rxd_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TX_CTL, "rgmii_1_tx_ctl", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXC, "rgmii_1_txc", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXD_0, "rgmii_1_txd_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXD_1, "rgmii_1_txd_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXD_2, "rgmii_1_txd_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXD_3, "rgmii_1_txd_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_GPIO_0, "rgmii_gpio_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_GPIO_1, "rgmii_gpio_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_GPIO_2, "rgmii_gpio_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_GPIO_3, "rgmii_gpio_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RTXDATA2G_TXDATA3G1,
+		"rtxdata2g_txdata3g1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RTXEN2G_TXDATA3G2, "rtxen2g_txdata3g2",
+		std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RXDATA3G0, "rxdata3g0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RXDATA3G1, "rxdata3g1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RXDATA3G2, "rxdata3g2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_CLK, "sdio1_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_CMD, "sdio1_cmd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_DATA_0, "sdio1_data_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_DATA_1, "sdio1_data_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_DATA_2, "sdio1_data_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_DATA_3, "sdio1_data_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_CLK, "sdio4_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_CMD, "sdio4_cmd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_DATA_0, "sdio4_data_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_DATA_1, "sdio4_data_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_DATA_2, "sdio4_data_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_DATA_3, "sdio4_data_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM_CLK, "sim_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM_DATA, "sim_data", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM_DET, "sim_det", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM_RESETN, "sim_resetn", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM2_CLK, "sim2_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM2_DATA, "sim2_data", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM2_DET, "sim2_det", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM2_RESETN, "sim2_resetn", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SRI_C, "sri_c", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SRI_D, "sri_d", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SRI_E, "sri_e", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP_EXTCLK, "ssp_extclk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP0_CLK, "ssp0_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP0_FS, "ssp0_fs", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP0_RXD, "ssp0_rxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP0_TXD, "ssp0_txd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_CLK, "ssp2_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_FS_0, "ssp2_fs_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_FS_1, "ssp2_fs_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_FS_2, "ssp2_fs_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_FS_3, "ssp2_fs_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_RXD_0, "ssp2_rxd_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_RXD_1, "ssp2_rxd_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_TXD_0, "ssp2_txd_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_TXD_1, "ssp2_txd_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP3_CLK, "ssp3_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP3_FS, "ssp3_fs", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP3_RXD, "ssp3_rxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP3_TXD, "ssp3_txd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP4_CLK, "ssp4_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP4_FS, "ssp4_fs", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP4_RXD, "ssp4_rxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP4_TXD, "ssp4_txd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP5_CLK, "ssp5_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP5_FS, "ssp5_fs", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP5_RXD, "ssp5_rxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP5_TXD, "ssp5_txd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP6_CLK, "ssp6_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP6_FS, "ssp6_fs", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP6_RXD, "ssp6_rxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP6_TXD, "ssp6_txd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_STAT_1, "stat_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_STAT_2, "stat_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SYSCLKEN, "sysclken", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACECLK, "traceclk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT00, "tracedt00", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT01, "tracedt01", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT02, "tracedt02", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT03, "tracedt03", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT04, "tracedt04", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT05, "tracedt05", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT06, "tracedt06", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT07, "tracedt07", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT08, "tracedt08", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT09, "tracedt09", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT10, "tracedt10", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT11, "tracedt11", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT12, "tracedt12", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT13, "tracedt13", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT14, "tracedt14", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT15, "tracedt15", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TXDATA3G0, "txdata3g0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TXPWRIND, "txpwrind", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB1_UCTS, "uartb1_ucts", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB1_URTS, "uartb1_urts", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB1_URXD, "uartb1_urxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB1_UTXD, "uartb1_utxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB2_URXD, "uartb2_urxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB2_UTXD, "uartb2_utxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB3_UCTS, "uartb3_ucts", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB3_URTS, "uartb3_urts", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB3_URXD, "uartb3_urxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB3_UTXD, "uartb3_utxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB4_UCTS, "uartb4_ucts", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB4_URTS, "uartb4_urts", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB4_URXD, "uartb4_urxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB4_UTXD, "uartb4_utxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM1_SCL, "vc_cam1_scl", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM1_SDA, "vc_cam1_sda", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM2_SCL, "vc_cam2_scl", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM2_SDA, "vc_cam2_sda", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM3_SCL, "vc_cam3_scl", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM3_SDA, "vc_cam3_sda", i2c),
+};
+
+static const char * const bcm281xx_alt_groups[] = {
+	"adcsync",
+	"bat_rm",
+	"bsc1_scl",
+	"bsc1_sda",
+	"bsc2_scl",
+	"bsc2_sda",
+	"classgpwr",
+	"clk_cx8",
+	"clkout_0",
+	"clkout_1",
+	"clkout_2",
+	"clkout_3",
+	"clkreq_in_0",
+	"clkreq_in_1",
+	"cws_sys_req1",
+	"cws_sys_req2",
+	"cws_sys_req3",
+	"digmic1_clk",
+	"digmic1_dq",
+	"digmic2_clk",
+	"digmic2_dq",
+	"gpen13",
+	"gpen14",
+	"gpen15",
+	"gpio00",
+	"gpio01",
+	"gpio02",
+	"gpio03",
+	"gpio04",
+	"gpio05",
+	"gpio06",
+	"gpio07",
+	"gpio08",
+	"gpio09",
+	"gpio10",
+	"gpio11",
+	"gpio12",
+	"gpio13",
+	"gpio14",
+	"gps_pablank",
+	"gps_tmark",
+	"hdmi_scl",
+	"hdmi_sda",
+	"ic_dm",
+	"ic_dp",
+	"kp_col_ip_0",
+	"kp_col_ip_1",
+	"kp_col_ip_2",
+	"kp_col_ip_3",
+	"kp_row_op_0",
+	"kp_row_op_1",
+	"kp_row_op_2",
+	"kp_row_op_3",
+	"lcd_b_0",
+	"lcd_b_1",
+	"lcd_b_2",
+	"lcd_b_3",
+	"lcd_b_4",
+	"lcd_b_5",
+	"lcd_b_6",
+	"lcd_b_7",
+	"lcd_g_0",
+	"lcd_g_1",
+	"lcd_g_2",
+	"lcd_g_3",
+	"lcd_g_4",
+	"lcd_g_5",
+	"lcd_g_6",
+	"lcd_g_7",
+	"lcd_hsync",
+	"lcd_oe",
+	"lcd_pclk",
+	"lcd_r_0",
+	"lcd_r_1",
+	"lcd_r_2",
+	"lcd_r_3",
+	"lcd_r_4",
+	"lcd_r_5",
+	"lcd_r_6",
+	"lcd_r_7",
+	"lcd_vsync",
+	"mdmgpio0",
+	"mdmgpio1",
+	"mdmgpio2",
+	"mdmgpio3",
+	"mdmgpio4",
+	"mdmgpio5",
+	"mdmgpio6",
+	"mdmgpio7",
+	"mdmgpio8",
+	"mphi_data_0",
+	"mphi_data_1",
+	"mphi_data_2",
+	"mphi_data_3",
+	"mphi_data_4",
+	"mphi_data_5",
+	"mphi_data_6",
+	"mphi_data_7",
+	"mphi_data_8",
+	"mphi_data_9",
+	"mphi_data_10",
+	"mphi_data_11",
+	"mphi_data_12",
+	"mphi_data_13",
+	"mphi_data_14",
+	"mphi_data_15",
+	"mphi_ha0",
+	"mphi_hat0",
+	"mphi_hat1",
+	"mphi_hce0_n",
+	"mphi_hce1_n",
+	"mphi_hrd_n",
+	"mphi_hwr_n",
+	"mphi_run0",
+	"mphi_run1",
+	"mtx_scan_clk",
+	"mtx_scan_data",
+	"nand_ad_0",
+	"nand_ad_1",
+	"nand_ad_2",
+	"nand_ad_3",
+	"nand_ad_4",
+	"nand_ad_5",
+	"nand_ad_6",
+	"nand_ad_7",
+	"nand_ale",
+	"nand_cen_0",
+	"nand_cen_1",
+	"nand_cle",
+	"nand_oen",
+	"nand_rdy_0",
+	"nand_rdy_1",
+	"nand_wen",
+	"nand_wp",
+	"pc1",
+	"pc2",
+	"pmu_int",
+	"pmu_scl",
+	"pmu_sda",
+	"rfst2g_mtsloten3g",
+	"rgmii_0_rx_ctl",
+	"rgmii_0_rxc",
+	"rgmii_0_rxd_0",
+	"rgmii_0_rxd_1",
+	"rgmii_0_rxd_2",
+	"rgmii_0_rxd_3",
+	"rgmii_0_tx_ctl",
+	"rgmii_0_txc",
+	"rgmii_0_txd_0",
+	"rgmii_0_txd_1",
+	"rgmii_0_txd_2",
+	"rgmii_0_txd_3",
+	"rgmii_1_rx_ctl",
+	"rgmii_1_rxc",
+	"rgmii_1_rxd_0",
+	"rgmii_1_rxd_1",
+	"rgmii_1_rxd_2",
+	"rgmii_1_rxd_3",
+	"rgmii_1_tx_ctl",
+	"rgmii_1_txc",
+	"rgmii_1_txd_0",
+	"rgmii_1_txd_1",
+	"rgmii_1_txd_2",
+	"rgmii_1_txd_3",
+	"rgmii_gpio_0",
+	"rgmii_gpio_1",
+	"rgmii_gpio_2",
+	"rgmii_gpio_3",
+	"rtxdata2g_txdata3g1",
+	"rtxen2g_txdata3g2",
+	"rxdata3g0",
+	"rxdata3g1",
+	"rxdata3g2",
+	"sdio1_clk",
+	"sdio1_cmd",
+	"sdio1_data_0",
+	"sdio1_data_1",
+	"sdio1_data_2",
+	"sdio1_data_3",
+	"sdio4_clk",
+	"sdio4_cmd",
+	"sdio4_data_0",
+	"sdio4_data_1",
+	"sdio4_data_2",
+	"sdio4_data_3",
+	"sim_clk",
+	"sim_data",
+	"sim_det",
+	"sim_resetn",
+	"sim2_clk",
+	"sim2_data",
+	"sim2_det",
+	"sim2_resetn",
+	"sri_c",
+	"sri_d",
+	"sri_e",
+	"ssp_extclk",
+	"ssp0_clk",
+	"ssp0_fs",
+	"ssp0_rxd",
+	"ssp0_txd",
+	"ssp2_clk",
+	"ssp2_fs_0",
+	"ssp2_fs_1",
+	"ssp2_fs_2",
+	"ssp2_fs_3",
+	"ssp2_rxd_0",
+	"ssp2_rxd_1",
+	"ssp2_txd_0",
+	"ssp2_txd_1",
+	"ssp3_clk",
+	"ssp3_fs",
+	"ssp3_rxd",
+	"ssp3_txd",
+	"ssp4_clk",
+	"ssp4_fs",
+	"ssp4_rxd",
+	"ssp4_txd",
+	"ssp5_clk",
+	"ssp5_fs",
+	"ssp5_rxd",
+	"ssp5_txd",
+	"ssp6_clk",
+	"ssp6_fs",
+	"ssp6_rxd",
+	"ssp6_txd",
+	"stat_1",
+	"stat_2",
+	"sysclken",
+	"traceclk",
+	"tracedt00",
+	"tracedt01",
+	"tracedt02",
+	"tracedt03",
+	"tracedt04",
+	"tracedt05",
+	"tracedt06",
+	"tracedt07",
+	"tracedt08",
+	"tracedt09",
+	"tracedt10",
+	"tracedt11",
+	"tracedt12",
+	"tracedt13",
+	"tracedt14",
+	"tracedt15",
+	"txdata3g0",
+	"txpwrind",
+	"uartb1_ucts",
+	"uartb1_urts",
+	"uartb1_urxd",
+	"uartb1_utxd",
+	"uartb2_urxd",
+	"uartb2_utxd",
+	"uartb3_ucts",
+	"uartb3_urts",
+	"uartb3_urxd",
+	"uartb3_utxd",
+	"uartb4_ucts",
+	"uartb4_urts",
+	"uartb4_urxd",
+	"uartb4_utxd",
+	"vc_cam1_scl",
+	"vc_cam1_sda",
+	"vc_cam2_scl",
+	"vc_cam2_sda",
+	"vc_cam3_scl",
+	"vc_cam3_sda",
+};
+
+/* Every pin can implement all ALT1-ALT4 functions */
+#define BCM281XX_PIN_FUNCTION(fcn_name)			\
+{							\
+	.name = #fcn_name,				\
+	.groups = bcm281xx_alt_groups,			\
+	.ngroups = ARRAY_SIZE(bcm281xx_alt_groups),	\
+}
+
+static const struct bcm281xx_pin_function bcm281xx_functions[] = {
+	BCM281XX_PIN_FUNCTION(alt1),
+	BCM281XX_PIN_FUNCTION(alt2),
+	BCM281XX_PIN_FUNCTION(alt3),
+	BCM281XX_PIN_FUNCTION(alt4),
+};
+
+static struct bcm281xx_pinctrl_data bcm281xx_pinctrl = {
+	.pins = bcm281xx_pinctrl_pins,
+	.npins = ARRAY_SIZE(bcm281xx_pinctrl_pins),
+	.functions = bcm281xx_functions,
+	.nfunctions = ARRAY_SIZE(bcm281xx_functions),
+};
+
+static inline enum bcm281xx_pin_type pin_type_get(struct pinctrl_dev *pctldev,
+						  unsigned pin)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+
+	if (pin >= pdata->npins)
+		return BCM281XX_PIN_TYPE_UNKNOWN;
+
+	return *(enum bcm281xx_pin_type *)(pdata->pins[pin].drv_data);
+}
+
+#define BCM281XX_PIN_SHIFT(type, param) \
+	(BCM281XX_ ## type ## _PIN_REG_ ## param ## _SHIFT)
+
+#define BCM281XX_PIN_MASK(type, param) \
+	(BCM281XX_ ## type ## _PIN_REG_ ## param ## _MASK)
+
+/*
+ * This helper function is used to build up the value and mask used to write to
+ * a pin register, but does not actually write to the register.
+ */
+static inline void bcm281xx_pin_update(u32 *reg_val, u32 *reg_mask,
+				       u32 param_val, u32 param_shift,
+				       u32 param_mask)
+{
+	*reg_val &= ~param_mask;
+	*reg_val |= (param_val << param_shift) & param_mask;
+	*reg_mask |= param_mask;
+}
+
+static struct regmap_config bcm281xx_pinctrl_regmap_config = {
+	.reg_bits = 32,
+	.reg_stride = 4,
+	.val_bits = 32,
+	.max_register = BCM281XX_PIN_VC_CAM3_SDA,
+};
+
+static int bcm281xx_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+
+	return pdata->npins;
+}
+
+static const char *bcm281xx_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
+						   unsigned group)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+
+	return pdata->pins[group].name;
+}
+
+static int bcm281xx_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
+					   unsigned group,
+					   const unsigned **pins,
+					   unsigned *num_pins)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+
+	*pins = &pdata->pins[group].number;
+	*num_pins = 1;
+
+	return 0;
+}
+
+static void bcm281xx_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
+					  struct seq_file *s,
+					  unsigned offset)
+{
+	seq_printf(s, " %s", dev_name(pctldev->dev));
+}
+
+static struct pinctrl_ops bcm281xx_pinctrl_ops = {
+	.get_groups_count = bcm281xx_pinctrl_get_groups_count,
+	.get_group_name = bcm281xx_pinctrl_get_group_name,
+	.get_group_pins = bcm281xx_pinctrl_get_group_pins,
+	.pin_dbg_show = bcm281xx_pinctrl_pin_dbg_show,
+	.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
+	.dt_free_map = pinctrl_utils_dt_free_map,
+};
+
+static int bcm281xx_pinctrl_get_fcns_count(struct pinctrl_dev *pctldev)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+
+	return pdata->nfunctions;
+}
+
+static const char *bcm281xx_pinctrl_get_fcn_name(struct pinctrl_dev *pctldev,
+						 unsigned function)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+
+	return pdata->functions[function].name;
+}
+
+static int bcm281xx_pinctrl_get_fcn_groups(struct pinctrl_dev *pctldev,
+					   unsigned function,
+					   const char * const **groups,
+					   unsigned * const num_groups)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+
+	*groups = pdata->functions[function].groups;
+	*num_groups = pdata->functions[function].ngroups;
+
+	return 0;
+}
+
+static int bcm281xx_pinmux_set(struct pinctrl_dev *pctldev,
+			       unsigned function,
+			       unsigned group)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+	const struct bcm281xx_pin_function *f = &pdata->functions[function];
+	u32 offset = 4 * pdata->pins[group].number;
+	int rc = 0;
+
+	dev_dbg(pctldev->dev,
+		"%s(): Enable function %s (%d) of pin %s (%d) @offset 0x%x.\n",
+		__func__, f->name, function, pdata->pins[group].name,
+		pdata->pins[group].number, offset);
+
+	rc = regmap_update_bits(pdata->regmap, offset,
+		BCM281XX_PIN_REG_F_SEL_MASK,
+		function << BCM281XX_PIN_REG_F_SEL_SHIFT);
+	if (rc)
+		dev_err(pctldev->dev,
+			"Error updating register for pin %s (%d).\n",
+			pdata->pins[group].name, pdata->pins[group].number);
+
+	return rc;
+}
+
+static struct pinmux_ops bcm281xx_pinctrl_pinmux_ops = {
+	.get_functions_count = bcm281xx_pinctrl_get_fcns_count,
+	.get_function_name = bcm281xx_pinctrl_get_fcn_name,
+	.get_function_groups = bcm281xx_pinctrl_get_fcn_groups,
+	.set_mux = bcm281xx_pinmux_set,
+};
+
+static int bcm281xx_pinctrl_pin_config_get(struct pinctrl_dev *pctldev,
+					   unsigned pin,
+					   unsigned long *config)
+{
+	return -ENOTSUPP;
+}
+
+
+/* Goes through the configs and update register val/mask */
+static int bcm281xx_std_pin_update(struct pinctrl_dev *pctldev,
+				   unsigned pin,
+				   unsigned long *configs,
+				   unsigned num_configs,
+				   u32 *val,
+				   u32 *mask)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+	int i;
+	enum pin_config_param param;
+	u16 arg;
+
+	for (i = 0; i < num_configs; i++) {
+		param = pinconf_to_config_param(configs[i]);
+		arg = pinconf_to_config_argument(configs[i]);
+
+		switch (param) {
+		case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
+			arg = (arg >= 1 ? 1 : 0);
+			bcm281xx_pin_update(val, mask, arg,
+				BCM281XX_PIN_SHIFT(STD, HYST),
+				BCM281XX_PIN_MASK(STD, HYST));
+			break;
+		/*
+		 * The pin bias can only be one of pull-up, pull-down, or
+		 * disable.  The user does not need to specify a value for the
+		 * property, and the default value from pinconf-generic is
+		 * ignored.
+		 */
+		case PIN_CONFIG_BIAS_DISABLE:
+			bcm281xx_pin_update(val, mask, 0,
+				BCM281XX_PIN_SHIFT(STD, PULL_UP),
+				BCM281XX_PIN_MASK(STD, PULL_UP));
+			bcm281xx_pin_update(val, mask, 0,
+				BCM281XX_PIN_SHIFT(STD, PULL_DN),
+				BCM281XX_PIN_MASK(STD, PULL_DN));
+			break;
+
+		case PIN_CONFIG_BIAS_PULL_UP:
+			bcm281xx_pin_update(val, mask, 1,
+				BCM281XX_PIN_SHIFT(STD, PULL_UP),
+				BCM281XX_PIN_MASK(STD, PULL_UP));
+			bcm281xx_pin_update(val, mask, 0,
+				BCM281XX_PIN_SHIFT(STD, PULL_DN),
+				BCM281XX_PIN_MASK(STD, PULL_DN));
+			break;
+
+		case PIN_CONFIG_BIAS_PULL_DOWN:
+			bcm281xx_pin_update(val, mask, 0,
+				BCM281XX_PIN_SHIFT(STD, PULL_UP),
+				BCM281XX_PIN_MASK(STD, PULL_UP));
+			bcm281xx_pin_update(val, mask, 1,
+				BCM281XX_PIN_SHIFT(STD, PULL_DN),
+				BCM281XX_PIN_MASK(STD, PULL_DN));
+			break;
+
+		case PIN_CONFIG_SLEW_RATE:
+			arg = (arg >= 1 ? 1 : 0);
+			bcm281xx_pin_update(val, mask, arg,
+				BCM281XX_PIN_SHIFT(STD, SLEW),
+				BCM281XX_PIN_MASK(STD, SLEW));
+			break;
+
+		case PIN_CONFIG_INPUT_ENABLE:
+			/* inversed since register is for input _disable_ */
+			arg = (arg >= 1 ? 0 : 1);
+			bcm281xx_pin_update(val, mask, arg,
+				BCM281XX_PIN_SHIFT(STD, INPUT_DIS),
+				BCM281XX_PIN_MASK(STD, INPUT_DIS));
+			break;
+
+		case PIN_CONFIG_DRIVE_STRENGTH:
+			/* Valid range is 2-16 mA, even numbers only */
+			if ((arg < 2) || (arg > 16) || (arg % 2)) {
+				dev_err(pctldev->dev,
+					"Invalid Drive Strength value (%d) for "
+					"pin %s (%d). Valid values are "
+					"(2..16) mA, even numbers only.\n",
+					arg, pdata->pins[pin].name, pin);
+				return -EINVAL;
+			}
+			bcm281xx_pin_update(val, mask, (arg/2)-1,
+				BCM281XX_PIN_SHIFT(STD, DRV_STR),
+				BCM281XX_PIN_MASK(STD, DRV_STR));
+			break;
+
+		default:
+			dev_err(pctldev->dev,
+				"Unrecognized pin config %d for pin %s (%d).\n",
+				param, pdata->pins[pin].name, pin);
+			return -EINVAL;
+
+		} /* switch config */
+	} /* for each config */
+
+	return 0;
+}
+
+/*
+ * The pull-up strength for an I2C pin is represented by bits 4-6 in the
+ * register with the following mapping:
+ *   0b000: No pull-up
+ *   0b001: 1200 Ohm
+ *   0b010: 1800 Ohm
+ *   0b011: 720 Ohm
+ *   0b100: 2700 Ohm
+ *   0b101: 831 Ohm
+ *   0b110: 1080 Ohm
+ *   0b111: 568 Ohm
+ * This array maps pull-up strength in Ohms to register values (1+index).
+ */
+static const u16 bcm281xx_pullup_map[] = {
+	1200, 1800, 720, 2700, 831, 1080, 568
+};
+
+/* Goes through the configs and update register val/mask */
+static int bcm281xx_i2c_pin_update(struct pinctrl_dev *pctldev,
+				   unsigned pin,
+				   unsigned long *configs,
+				   unsigned num_configs,
+				   u32 *val,
+				   u32 *mask)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+	int i, j;
+	enum pin_config_param param;
+	u16 arg;
+
+	for (i = 0; i < num_configs; i++) {
+		param = pinconf_to_config_param(configs[i]);
+		arg = pinconf_to_config_argument(configs[i]);
+
+		switch (param) {
+		case PIN_CONFIG_BIAS_PULL_UP:
+			for (j = 0; j < ARRAY_SIZE(bcm281xx_pullup_map); j++)
+				if (bcm281xx_pullup_map[j] == arg)
+					break;
+
+			if (j == ARRAY_SIZE(bcm281xx_pullup_map)) {
+				dev_err(pctldev->dev,
+					"Invalid pull-up value (%d) for pin %s "
+					"(%d). Valid values are 568, 720, 831, "
+					"1080, 1200, 1800, 2700 Ohms.\n",
+					arg, pdata->pins[pin].name, pin);
+				return -EINVAL;
+			}
+
+			bcm281xx_pin_update(val, mask, j+1,
+				BCM281XX_PIN_SHIFT(I2C, PULL_UP_STR),
+				BCM281XX_PIN_MASK(I2C, PULL_UP_STR));
+			break;
+
+		case PIN_CONFIG_BIAS_DISABLE:
+			bcm281xx_pin_update(val, mask, 0,
+				BCM281XX_PIN_SHIFT(I2C, PULL_UP_STR),
+				BCM281XX_PIN_MASK(I2C, PULL_UP_STR));
+			break;
+
+		case PIN_CONFIG_SLEW_RATE:
+			arg = (arg >= 1 ? 1 : 0);
+			bcm281xx_pin_update(val, mask, arg,
+				BCM281XX_PIN_SHIFT(I2C, SLEW),
+				BCM281XX_PIN_MASK(I2C, SLEW));
+			break;
+
+		case PIN_CONFIG_INPUT_ENABLE:
+			/* inversed since register is for input _disable_ */
+			arg = (arg >= 1 ? 0 : 1);
+			bcm281xx_pin_update(val, mask, arg,
+				BCM281XX_PIN_SHIFT(I2C, INPUT_DIS),
+				BCM281XX_PIN_MASK(I2C, INPUT_DIS));
+			break;
+
+		default:
+			dev_err(pctldev->dev,
+				"Unrecognized pin config %d for pin %s (%d).\n",
+				param, pdata->pins[pin].name, pin);
+			return -EINVAL;
+
+		} /* switch config */
+	} /* for each config */
+
+	return 0;
+}
+
+/* Goes through the configs and update register val/mask */
+static int bcm281xx_hdmi_pin_update(struct pinctrl_dev *pctldev,
+				    unsigned pin,
+				    unsigned long *configs,
+				    unsigned num_configs,
+				    u32 *val,
+				    u32 *mask)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+	int i;
+	enum pin_config_param param;
+	u16 arg;
+
+	for (i = 0; i < num_configs; i++) {
+		param = pinconf_to_config_param(configs[i]);
+		arg = pinconf_to_config_argument(configs[i]);
+
+		switch (param) {
+		case PIN_CONFIG_SLEW_RATE:
+			arg = (arg >= 1 ? 1 : 0);
+			bcm281xx_pin_update(val, mask, arg,
+				BCM281XX_PIN_SHIFT(HDMI, MODE),
+				BCM281XX_PIN_MASK(HDMI, MODE));
+			break;
+
+		case PIN_CONFIG_INPUT_ENABLE:
+			/* inversed since register is for input _disable_ */
+			arg = (arg >= 1 ? 0 : 1);
+			bcm281xx_pin_update(val, mask, arg,
+				BCM281XX_PIN_SHIFT(HDMI, INPUT_DIS),
+				BCM281XX_PIN_MASK(HDMI, INPUT_DIS));
+			break;
+
+		default:
+			dev_err(pctldev->dev,
+				"Unrecognized pin config %d for pin %s (%d).\n",
+				param, pdata->pins[pin].name, pin);
+			return -EINVAL;
+
+		} /* switch config */
+	} /* for each config */
+
+	return 0;
+}
+
+static int bcm281xx_pinctrl_pin_config_set(struct pinctrl_dev *pctldev,
+					   unsigned pin,
+					   unsigned long *configs,
+					   unsigned num_configs)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+	enum bcm281xx_pin_type pin_type;
+	u32 offset = 4 * pin;
+	u32 cfg_val, cfg_mask;
+	int rc;
+
+	cfg_val = 0;
+	cfg_mask = 0;
+	pin_type = pin_type_get(pctldev, pin);
+
+	/* Different pins have different configuration options */
+	switch (pin_type) {
+	case BCM281XX_PIN_TYPE_STD:
+		rc = bcm281xx_std_pin_update(pctldev, pin, configs,
+			num_configs, &cfg_val, &cfg_mask);
+		break;
+
+	case BCM281XX_PIN_TYPE_I2C:
+		rc = bcm281xx_i2c_pin_update(pctldev, pin, configs,
+			num_configs, &cfg_val, &cfg_mask);
+		break;
+
+	case BCM281XX_PIN_TYPE_HDMI:
+		rc = bcm281xx_hdmi_pin_update(pctldev, pin, configs,
+			num_configs, &cfg_val, &cfg_mask);
+		break;
+
+	default:
+		dev_err(pctldev->dev, "Unknown pin type for pin %s (%d).\n",
+			pdata->pins[pin].name, pin);
+		return -EINVAL;
+
+	} /* switch pin type */
+
+	if (rc)
+		return rc;
+
+	dev_dbg(pctldev->dev,
+		"%s(): Set pin %s (%d) with config 0x%x, mask 0x%x\n",
+		__func__, pdata->pins[pin].name, pin, cfg_val, cfg_mask);
+
+	rc = regmap_update_bits(pdata->regmap, offset, cfg_mask, cfg_val);
+	if (rc) {
+		dev_err(pctldev->dev,
+			"Error updating register for pin %s (%d).\n",
+			pdata->pins[pin].name, pin);
+		return rc;
+	}
+
+	return 0;
+}
+
+static struct pinconf_ops bcm281xx_pinctrl_pinconf_ops = {
+	.pin_config_get = bcm281xx_pinctrl_pin_config_get,
+	.pin_config_set = bcm281xx_pinctrl_pin_config_set,
+};
+
+static struct pinctrl_desc bcm281xx_pinctrl_desc = {
+	/* name, pins, npins members initialized in probe function */
+	.pctlops = &bcm281xx_pinctrl_ops,
+	.pmxops = &bcm281xx_pinctrl_pinmux_ops,
+	.confops = &bcm281xx_pinctrl_pinconf_ops,
+	.owner = THIS_MODULE,
+};
+
+static int __init bcm281xx_pinctrl_probe(struct platform_device *pdev)
+{
+	struct bcm281xx_pinctrl_data *pdata = &bcm281xx_pinctrl;
+	struct resource *res;
+	struct pinctrl_dev *pctl;
+
+	/* So far We can assume there is only 1 bank of registers */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	pdata->reg_base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(pdata->reg_base)) {
+		dev_err(&pdev->dev, "Failed to ioremap MEM resource\n");
+		return -ENODEV;
+	}
+
+	/* Initialize the dynamic part of pinctrl_desc */
+	pdata->regmap = devm_regmap_init_mmio(&pdev->dev, pdata->reg_base,
+		&bcm281xx_pinctrl_regmap_config);
+	if (IS_ERR(pdata->regmap)) {
+		dev_err(&pdev->dev, "Regmap MMIO init failed.\n");
+		return -ENODEV;
+	}
+
+	bcm281xx_pinctrl_desc.name = dev_name(&pdev->dev);
+	bcm281xx_pinctrl_desc.pins = bcm281xx_pinctrl.pins;
+	bcm281xx_pinctrl_desc.npins = bcm281xx_pinctrl.npins;
+
+	pctl = pinctrl_register(&bcm281xx_pinctrl_desc,
+				&pdev->dev,
+				pdata);
+	if (!pctl) {
+		dev_err(&pdev->dev, "Failed to register pinctrl\n");
+		return -ENODEV;
+	}
+
+	platform_set_drvdata(pdev, pdata);
+
+	return 0;
+}
+
+static struct of_device_id bcm281xx_pinctrl_of_match[] = {
+	{ .compatible = "brcm,bcm11351-pinctrl", },
+	{ },
+};
+
+static struct platform_driver bcm281xx_pinctrl_driver = {
+	.driver = {
+		.name = "bcm281xx-pinctrl",
+		.of_match_table = bcm281xx_pinctrl_of_match,
+	},
+};
+
+module_platform_driver_probe(bcm281xx_pinctrl_driver, bcm281xx_pinctrl_probe);
+
+MODULE_AUTHOR("Broadcom Corporation <bcm-kernel-feedback-list@broadcom.com>");
+MODULE_AUTHOR("Sherman Yin <syin@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom BCM281xx pinctrl driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/pinctrl/bcm/pinctrl-bcm2835.c b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
new file mode 100644
index 0000000..9aa8a3f
--- /dev/null
+++ b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
@@ -0,0 +1,1072 @@
+/*
+ * Driver for Broadcom BCM2835 GPIO unit (pinctrl + GPIO)
+ *
+ * Copyright (C) 2012 Chris Boot, Simon Arlott, Stephen Warren
+ *
+ * This driver is inspired by:
+ * pinctrl-nomadik.c, please see original file for copyright information
+ * pinctrl-tegra.c, please see original file for copyright information
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/bitmap.h>
+#include <linux/bug.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/irqdesc.h>
+#include <linux/irqdomain.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/pinctrl/machine.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/platform_device.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+
+#define MODULE_NAME "pinctrl-bcm2835"
+#define BCM2835_NUM_GPIOS 54
+#define BCM2835_NUM_BANKS 2
+
+#define BCM2835_PIN_BITMAP_SZ \
+	DIV_ROUND_UP(BCM2835_NUM_GPIOS, sizeof(unsigned long) * 8)
+
+/* GPIO register offsets */
+#define GPFSEL0		0x0	/* Function Select */
+#define GPSET0		0x1c	/* Pin Output Set */
+#define GPCLR0		0x28	/* Pin Output Clear */
+#define GPLEV0		0x34	/* Pin Level */
+#define GPEDS0		0x40	/* Pin Event Detect Status */
+#define GPREN0		0x4c	/* Pin Rising Edge Detect Enable */
+#define GPFEN0		0x58	/* Pin Falling Edge Detect Enable */
+#define GPHEN0		0x64	/* Pin High Detect Enable */
+#define GPLEN0		0x70	/* Pin Low Detect Enable */
+#define GPAREN0		0x7c	/* Pin Async Rising Edge Detect */
+#define GPAFEN0		0x88	/* Pin Async Falling Edge Detect */
+#define GPPUD		0x94	/* Pin Pull-up/down Enable */
+#define GPPUDCLK0	0x98	/* Pin Pull-up/down Enable Clock */
+
+#define FSEL_REG(p)		(GPFSEL0 + (((p) / 10) * 4))
+#define FSEL_SHIFT(p)		(((p) % 10) * 3)
+#define GPIO_REG_OFFSET(p)	((p) / 32)
+#define GPIO_REG_SHIFT(p)	((p) % 32)
+
+enum bcm2835_pinconf_param {
+	/* argument: bcm2835_pinconf_pull */
+	BCM2835_PINCONF_PARAM_PULL,
+};
+
+enum bcm2835_pinconf_pull {
+	BCM2835_PINCONFIG_PULL_NONE,
+	BCM2835_PINCONFIG_PULL_DOWN,
+	BCM2835_PINCONFIG_PULL_UP,
+};
+
+#define BCM2835_PINCONF_PACK(_param_, _arg_) ((_param_) << 16 | (_arg_))
+#define BCM2835_PINCONF_UNPACK_PARAM(_conf_) ((_conf_) >> 16)
+#define BCM2835_PINCONF_UNPACK_ARG(_conf_) ((_conf_) & 0xffff)
+
+struct bcm2835_gpio_irqdata {
+	struct bcm2835_pinctrl *pc;
+	int bank;
+};
+
+struct bcm2835_pinctrl {
+	struct device *dev;
+	void __iomem *base;
+	int irq[BCM2835_NUM_BANKS];
+
+	/* note: locking assumes each bank will have its own unsigned long */
+	unsigned long enabled_irq_map[BCM2835_NUM_BANKS];
+	unsigned int irq_type[BCM2835_NUM_GPIOS];
+
+	struct pinctrl_dev *pctl_dev;
+	struct irq_domain *irq_domain;
+	struct gpio_chip gpio_chip;
+	struct pinctrl_gpio_range gpio_range;
+
+	struct bcm2835_gpio_irqdata irq_data[BCM2835_NUM_BANKS];
+	spinlock_t irq_lock[BCM2835_NUM_BANKS];
+};
+
+static struct lock_class_key gpio_lock_class;
+
+/* pins are just named GPIO0..GPIO53 */
+#define BCM2835_GPIO_PIN(a) PINCTRL_PIN(a, "gpio" #a)
+static struct pinctrl_pin_desc bcm2835_gpio_pins[] = {
+	BCM2835_GPIO_PIN(0),
+	BCM2835_GPIO_PIN(1),
+	BCM2835_GPIO_PIN(2),
+	BCM2835_GPIO_PIN(3),
+	BCM2835_GPIO_PIN(4),
+	BCM2835_GPIO_PIN(5),
+	BCM2835_GPIO_PIN(6),
+	BCM2835_GPIO_PIN(7),
+	BCM2835_GPIO_PIN(8),
+	BCM2835_GPIO_PIN(9),
+	BCM2835_GPIO_PIN(10),
+	BCM2835_GPIO_PIN(11),
+	BCM2835_GPIO_PIN(12),
+	BCM2835_GPIO_PIN(13),
+	BCM2835_GPIO_PIN(14),
+	BCM2835_GPIO_PIN(15),
+	BCM2835_GPIO_PIN(16),
+	BCM2835_GPIO_PIN(17),
+	BCM2835_GPIO_PIN(18),
+	BCM2835_GPIO_PIN(19),
+	BCM2835_GPIO_PIN(20),
+	BCM2835_GPIO_PIN(21),
+	BCM2835_GPIO_PIN(22),
+	BCM2835_GPIO_PIN(23),
+	BCM2835_GPIO_PIN(24),
+	BCM2835_GPIO_PIN(25),
+	BCM2835_GPIO_PIN(26),
+	BCM2835_GPIO_PIN(27),
+	BCM2835_GPIO_PIN(28),
+	BCM2835_GPIO_PIN(29),
+	BCM2835_GPIO_PIN(30),
+	BCM2835_GPIO_PIN(31),
+	BCM2835_GPIO_PIN(32),
+	BCM2835_GPIO_PIN(33),
+	BCM2835_GPIO_PIN(34),
+	BCM2835_GPIO_PIN(35),
+	BCM2835_GPIO_PIN(36),
+	BCM2835_GPIO_PIN(37),
+	BCM2835_GPIO_PIN(38),
+	BCM2835_GPIO_PIN(39),
+	BCM2835_GPIO_PIN(40),
+	BCM2835_GPIO_PIN(41),
+	BCM2835_GPIO_PIN(42),
+	BCM2835_GPIO_PIN(43),
+	BCM2835_GPIO_PIN(44),
+	BCM2835_GPIO_PIN(45),
+	BCM2835_GPIO_PIN(46),
+	BCM2835_GPIO_PIN(47),
+	BCM2835_GPIO_PIN(48),
+	BCM2835_GPIO_PIN(49),
+	BCM2835_GPIO_PIN(50),
+	BCM2835_GPIO_PIN(51),
+	BCM2835_GPIO_PIN(52),
+	BCM2835_GPIO_PIN(53),
+};
+
+/* one pin per group */
+static const char * const bcm2835_gpio_groups[] = {
+	"gpio0",
+	"gpio1",
+	"gpio2",
+	"gpio3",
+	"gpio4",
+	"gpio5",
+	"gpio6",
+	"gpio7",
+	"gpio8",
+	"gpio9",
+	"gpio10",
+	"gpio11",
+	"gpio12",
+	"gpio13",
+	"gpio14",
+	"gpio15",
+	"gpio16",
+	"gpio17",
+	"gpio18",
+	"gpio19",
+	"gpio20",
+	"gpio21",
+	"gpio22",
+	"gpio23",
+	"gpio24",
+	"gpio25",
+	"gpio26",
+	"gpio27",
+	"gpio28",
+	"gpio29",
+	"gpio30",
+	"gpio31",
+	"gpio32",
+	"gpio33",
+	"gpio34",
+	"gpio35",
+	"gpio36",
+	"gpio37",
+	"gpio38",
+	"gpio39",
+	"gpio40",
+	"gpio41",
+	"gpio42",
+	"gpio43",
+	"gpio44",
+	"gpio45",
+	"gpio46",
+	"gpio47",
+	"gpio48",
+	"gpio49",
+	"gpio50",
+	"gpio51",
+	"gpio52",
+	"gpio53",
+};
+
+enum bcm2835_fsel {
+	BCM2835_FSEL_GPIO_IN = 0,
+	BCM2835_FSEL_GPIO_OUT = 1,
+	BCM2835_FSEL_ALT0 = 4,
+	BCM2835_FSEL_ALT1 = 5,
+	BCM2835_FSEL_ALT2 = 6,
+	BCM2835_FSEL_ALT3 = 7,
+	BCM2835_FSEL_ALT4 = 3,
+	BCM2835_FSEL_ALT5 = 2,
+	BCM2835_FSEL_COUNT = 8,
+	BCM2835_FSEL_MASK = 0x7,
+};
+
+static const char * const bcm2835_functions[BCM2835_FSEL_COUNT] = {
+	[BCM2835_FSEL_GPIO_IN] = "gpio_in",
+	[BCM2835_FSEL_GPIO_OUT] = "gpio_out",
+	[BCM2835_FSEL_ALT0] = "alt0",
+	[BCM2835_FSEL_ALT1] = "alt1",
+	[BCM2835_FSEL_ALT2] = "alt2",
+	[BCM2835_FSEL_ALT3] = "alt3",
+	[BCM2835_FSEL_ALT4] = "alt4",
+	[BCM2835_FSEL_ALT5] = "alt5",
+};
+
+static const char * const irq_type_names[] = {
+	[IRQ_TYPE_NONE] = "none",
+	[IRQ_TYPE_EDGE_RISING] = "edge-rising",
+	[IRQ_TYPE_EDGE_FALLING] = "edge-falling",
+	[IRQ_TYPE_EDGE_BOTH] = "edge-both",
+	[IRQ_TYPE_LEVEL_HIGH] = "level-high",
+	[IRQ_TYPE_LEVEL_LOW] = "level-low",
+};
+
+static inline u32 bcm2835_gpio_rd(struct bcm2835_pinctrl *pc, unsigned reg)
+{
+	return readl(pc->base + reg);
+}
+
+static inline void bcm2835_gpio_wr(struct bcm2835_pinctrl *pc, unsigned reg,
+		u32 val)
+{
+	writel(val, pc->base + reg);
+}
+
+static inline int bcm2835_gpio_get_bit(struct bcm2835_pinctrl *pc, unsigned reg,
+		unsigned bit)
+{
+	reg += GPIO_REG_OFFSET(bit) * 4;
+	return (bcm2835_gpio_rd(pc, reg) >> GPIO_REG_SHIFT(bit)) & 1;
+}
+
+/* note NOT a read/modify/write cycle */
+static inline void bcm2835_gpio_set_bit(struct bcm2835_pinctrl *pc,
+		unsigned reg, unsigned bit)
+{
+	reg += GPIO_REG_OFFSET(bit) * 4;
+	bcm2835_gpio_wr(pc, reg, BIT(GPIO_REG_SHIFT(bit)));
+}
+
+static inline enum bcm2835_fsel bcm2835_pinctrl_fsel_get(
+		struct bcm2835_pinctrl *pc, unsigned pin)
+{
+	u32 val = bcm2835_gpio_rd(pc, FSEL_REG(pin));
+	enum bcm2835_fsel status = (val >> FSEL_SHIFT(pin)) & BCM2835_FSEL_MASK;
+
+	dev_dbg(pc->dev, "get %08x (%u => %s)\n", val, pin,
+			bcm2835_functions[status]);
+
+	return status;
+}
+
+static inline void bcm2835_pinctrl_fsel_set(
+		struct bcm2835_pinctrl *pc, unsigned pin,
+		enum bcm2835_fsel fsel)
+{
+	u32 val = bcm2835_gpio_rd(pc, FSEL_REG(pin));
+	enum bcm2835_fsel cur = (val >> FSEL_SHIFT(pin)) & BCM2835_FSEL_MASK;
+
+	dev_dbg(pc->dev, "read %08x (%u => %s)\n", val, pin,
+			bcm2835_functions[cur]);
+
+	if (cur == fsel)
+		return;
+
+	if (cur != BCM2835_FSEL_GPIO_IN && fsel != BCM2835_FSEL_GPIO_IN) {
+		/* always transition through GPIO_IN */
+		val &= ~(BCM2835_FSEL_MASK << FSEL_SHIFT(pin));
+		val |= BCM2835_FSEL_GPIO_IN << FSEL_SHIFT(pin);
+
+		dev_dbg(pc->dev, "trans %08x (%u <= %s)\n", val, pin,
+				bcm2835_functions[BCM2835_FSEL_GPIO_IN]);
+		bcm2835_gpio_wr(pc, FSEL_REG(pin), val);
+	}
+
+	val &= ~(BCM2835_FSEL_MASK << FSEL_SHIFT(pin));
+	val |= fsel << FSEL_SHIFT(pin);
+
+	dev_dbg(pc->dev, "write %08x (%u <= %s)\n", val, pin,
+			bcm2835_functions[fsel]);
+	bcm2835_gpio_wr(pc, FSEL_REG(pin), val);
+}
+
+static int bcm2835_gpio_request(struct gpio_chip *chip, unsigned offset)
+{
+	return pinctrl_request_gpio(chip->base + offset);
+}
+
+static void bcm2835_gpio_free(struct gpio_chip *chip, unsigned offset)
+{
+	pinctrl_free_gpio(chip->base + offset);
+}
+
+static int bcm2835_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+	return pinctrl_gpio_direction_input(chip->base + offset);
+}
+
+static int bcm2835_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+	struct bcm2835_pinctrl *pc = dev_get_drvdata(chip->dev);
+
+	return bcm2835_gpio_get_bit(pc, GPLEV0, offset);
+}
+
+static int bcm2835_gpio_direction_output(struct gpio_chip *chip,
+		unsigned offset, int value)
+{
+	return pinctrl_gpio_direction_output(chip->base + offset);
+}
+
+static void bcm2835_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+	struct bcm2835_pinctrl *pc = dev_get_drvdata(chip->dev);
+
+	bcm2835_gpio_set_bit(pc, value ? GPSET0 : GPCLR0, offset);
+}
+
+static int bcm2835_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+	struct bcm2835_pinctrl *pc = dev_get_drvdata(chip->dev);
+
+	return irq_linear_revmap(pc->irq_domain, offset);
+}
+
+static struct gpio_chip bcm2835_gpio_chip = {
+	.label = MODULE_NAME,
+	.owner = THIS_MODULE,
+	.request = bcm2835_gpio_request,
+	.free = bcm2835_gpio_free,
+	.direction_input = bcm2835_gpio_direction_input,
+	.direction_output = bcm2835_gpio_direction_output,
+	.get = bcm2835_gpio_get,
+	.set = bcm2835_gpio_set,
+	.to_irq = bcm2835_gpio_to_irq,
+	.base = -1,
+	.ngpio = BCM2835_NUM_GPIOS,
+	.can_sleep = false,
+};
+
+static irqreturn_t bcm2835_gpio_irq_handler(int irq, void *dev_id)
+{
+	struct bcm2835_gpio_irqdata *irqdata = dev_id;
+	struct bcm2835_pinctrl *pc = irqdata->pc;
+	int bank = irqdata->bank;
+	unsigned long events;
+	unsigned offset;
+	unsigned gpio;
+	unsigned int type;
+
+	events = bcm2835_gpio_rd(pc, GPEDS0 + bank * 4);
+	events &= pc->enabled_irq_map[bank];
+	for_each_set_bit(offset, &events, 32) {
+		gpio = (32 * bank) + offset;
+		type = pc->irq_type[gpio];
+
+		/* ack edge triggered IRQs immediately */
+		if (!(type & IRQ_TYPE_LEVEL_MASK))
+			bcm2835_gpio_set_bit(pc, GPEDS0, gpio);
+
+		generic_handle_irq(irq_linear_revmap(pc->irq_domain, gpio));
+
+		/* ack level triggered IRQ after handling them */
+		if (type & IRQ_TYPE_LEVEL_MASK)
+			bcm2835_gpio_set_bit(pc, GPEDS0, gpio);
+	}
+	return events ? IRQ_HANDLED : IRQ_NONE;
+}
+
+static inline void __bcm2835_gpio_irq_config(struct bcm2835_pinctrl *pc,
+	unsigned reg, unsigned offset, bool enable)
+{
+	u32 value;
+	reg += GPIO_REG_OFFSET(offset) * 4;
+	value = bcm2835_gpio_rd(pc, reg);
+	if (enable)
+		value |= BIT(GPIO_REG_SHIFT(offset));
+	else
+		value &= ~(BIT(GPIO_REG_SHIFT(offset)));
+	bcm2835_gpio_wr(pc, reg, value);
+}
+
+/* fast path for IRQ handler */
+static void bcm2835_gpio_irq_config(struct bcm2835_pinctrl *pc,
+	unsigned offset, bool enable)
+{
+	switch (pc->irq_type[offset]) {
+	case IRQ_TYPE_EDGE_RISING:
+		__bcm2835_gpio_irq_config(pc, GPREN0, offset, enable);
+		break;
+
+	case IRQ_TYPE_EDGE_FALLING:
+		__bcm2835_gpio_irq_config(pc, GPFEN0, offset, enable);
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		__bcm2835_gpio_irq_config(pc, GPREN0, offset, enable);
+		__bcm2835_gpio_irq_config(pc, GPFEN0, offset, enable);
+		break;
+
+	case IRQ_TYPE_LEVEL_HIGH:
+		__bcm2835_gpio_irq_config(pc, GPHEN0, offset, enable);
+		break;
+
+	case IRQ_TYPE_LEVEL_LOW:
+		__bcm2835_gpio_irq_config(pc, GPLEN0, offset, enable);
+		break;
+	}
+}
+
+static void bcm2835_gpio_irq_enable(struct irq_data *data)
+{
+	struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data);
+	unsigned gpio = irqd_to_hwirq(data);
+	unsigned offset = GPIO_REG_SHIFT(gpio);
+	unsigned bank = GPIO_REG_OFFSET(gpio);
+	unsigned long flags;
+
+	spin_lock_irqsave(&pc->irq_lock[bank], flags);
+	set_bit(offset, &pc->enabled_irq_map[bank]);
+	bcm2835_gpio_irq_config(pc, gpio, true);
+	spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
+}
+
+static void bcm2835_gpio_irq_disable(struct irq_data *data)
+{
+	struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data);
+	unsigned gpio = irqd_to_hwirq(data);
+	unsigned offset = GPIO_REG_SHIFT(gpio);
+	unsigned bank = GPIO_REG_OFFSET(gpio);
+	unsigned long flags;
+
+	spin_lock_irqsave(&pc->irq_lock[bank], flags);
+	bcm2835_gpio_irq_config(pc, gpio, false);
+	clear_bit(offset, &pc->enabled_irq_map[bank]);
+	spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
+}
+
+static int __bcm2835_gpio_irq_set_type_disabled(struct bcm2835_pinctrl *pc,
+	unsigned offset, unsigned int type)
+{
+	switch (type) {
+	case IRQ_TYPE_NONE:
+	case IRQ_TYPE_EDGE_RISING:
+	case IRQ_TYPE_EDGE_FALLING:
+	case IRQ_TYPE_EDGE_BOTH:
+	case IRQ_TYPE_LEVEL_HIGH:
+	case IRQ_TYPE_LEVEL_LOW:
+		pc->irq_type[offset] = type;
+		break;
+
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+/* slower path for reconfiguring IRQ type */
+static int __bcm2835_gpio_irq_set_type_enabled(struct bcm2835_pinctrl *pc,
+	unsigned offset, unsigned int type)
+{
+	switch (type) {
+	case IRQ_TYPE_NONE:
+		if (pc->irq_type[offset] != type) {
+			bcm2835_gpio_irq_config(pc, offset, false);
+			pc->irq_type[offset] = type;
+		}
+		break;
+
+	case IRQ_TYPE_EDGE_RISING:
+		if (pc->irq_type[offset] == IRQ_TYPE_EDGE_BOTH) {
+			/* RISING already enabled, disable FALLING */
+			pc->irq_type[offset] = IRQ_TYPE_EDGE_FALLING;
+			bcm2835_gpio_irq_config(pc, offset, false);
+			pc->irq_type[offset] = type;
+		} else if (pc->irq_type[offset] != type) {
+			bcm2835_gpio_irq_config(pc, offset, false);
+			pc->irq_type[offset] = type;
+			bcm2835_gpio_irq_config(pc, offset, true);
+		}
+		break;
+
+	case IRQ_TYPE_EDGE_FALLING:
+		if (pc->irq_type[offset] == IRQ_TYPE_EDGE_BOTH) {
+			/* FALLING already enabled, disable RISING */
+			pc->irq_type[offset] = IRQ_TYPE_EDGE_RISING;
+			bcm2835_gpio_irq_config(pc, offset, false);
+			pc->irq_type[offset] = type;
+		} else if (pc->irq_type[offset] != type) {
+			bcm2835_gpio_irq_config(pc, offset, false);
+			pc->irq_type[offset] = type;
+			bcm2835_gpio_irq_config(pc, offset, true);
+		}
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		if (pc->irq_type[offset] == IRQ_TYPE_EDGE_RISING) {
+			/* RISING already enabled, enable FALLING too */
+			pc->irq_type[offset] = IRQ_TYPE_EDGE_FALLING;
+			bcm2835_gpio_irq_config(pc, offset, true);
+			pc->irq_type[offset] = type;
+		} else if (pc->irq_type[offset] == IRQ_TYPE_EDGE_FALLING) {
+			/* FALLING already enabled, enable RISING too */
+			pc->irq_type[offset] = IRQ_TYPE_EDGE_RISING;
+			bcm2835_gpio_irq_config(pc, offset, true);
+			pc->irq_type[offset] = type;
+		} else if (pc->irq_type[offset] != type) {
+			bcm2835_gpio_irq_config(pc, offset, false);
+			pc->irq_type[offset] = type;
+			bcm2835_gpio_irq_config(pc, offset, true);
+		}
+		break;
+
+	case IRQ_TYPE_LEVEL_HIGH:
+	case IRQ_TYPE_LEVEL_LOW:
+		if (pc->irq_type[offset] != type) {
+			bcm2835_gpio_irq_config(pc, offset, false);
+			pc->irq_type[offset] = type;
+			bcm2835_gpio_irq_config(pc, offset, true);
+		}
+		break;
+
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int bcm2835_gpio_irq_set_type(struct irq_data *data, unsigned int type)
+{
+	struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data);
+	unsigned gpio = irqd_to_hwirq(data);
+	unsigned offset = GPIO_REG_SHIFT(gpio);
+	unsigned bank = GPIO_REG_OFFSET(gpio);
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&pc->irq_lock[bank], flags);
+
+	if (test_bit(offset, &pc->enabled_irq_map[bank]))
+		ret = __bcm2835_gpio_irq_set_type_enabled(pc, gpio, type);
+	else
+		ret = __bcm2835_gpio_irq_set_type_disabled(pc, gpio, type);
+
+	spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
+
+	return ret;
+}
+
+static struct irq_chip bcm2835_gpio_irq_chip = {
+	.name = MODULE_NAME,
+	.irq_enable = bcm2835_gpio_irq_enable,
+	.irq_disable = bcm2835_gpio_irq_disable,
+	.irq_set_type = bcm2835_gpio_irq_set_type,
+};
+
+static int bcm2835_pctl_get_groups_count(struct pinctrl_dev *pctldev)
+{
+	return ARRAY_SIZE(bcm2835_gpio_groups);
+}
+
+static const char *bcm2835_pctl_get_group_name(struct pinctrl_dev *pctldev,
+		unsigned selector)
+{
+	return bcm2835_gpio_groups[selector];
+}
+
+static int bcm2835_pctl_get_group_pins(struct pinctrl_dev *pctldev,
+		unsigned selector,
+		const unsigned **pins,
+		unsigned *num_pins)
+{
+	*pins = &bcm2835_gpio_pins[selector].number;
+	*num_pins = 1;
+
+	return 0;
+}
+
+static void bcm2835_pctl_pin_dbg_show(struct pinctrl_dev *pctldev,
+		struct seq_file *s,
+		unsigned offset)
+{
+	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
+	enum bcm2835_fsel fsel = bcm2835_pinctrl_fsel_get(pc, offset);
+	const char *fname = bcm2835_functions[fsel];
+	int value = bcm2835_gpio_get_bit(pc, GPLEV0, offset);
+	int irq = irq_find_mapping(pc->irq_domain, offset);
+
+	seq_printf(s, "function %s in %s; irq %d (%s)",
+		fname, value ? "hi" : "lo",
+		irq, irq_type_names[pc->irq_type[offset]]);
+}
+
+static void bcm2835_pctl_dt_free_map(struct pinctrl_dev *pctldev,
+		struct pinctrl_map *maps, unsigned num_maps)
+{
+	int i;
+
+	for (i = 0; i < num_maps; i++)
+		if (maps[i].type == PIN_MAP_TYPE_CONFIGS_PIN)
+			kfree(maps[i].data.configs.configs);
+
+	kfree(maps);
+}
+
+static int bcm2835_pctl_dt_node_to_map_func(struct bcm2835_pinctrl *pc,
+		struct device_node *np, u32 pin, u32 fnum,
+		struct pinctrl_map **maps)
+{
+	struct pinctrl_map *map = *maps;
+
+	if (fnum >= ARRAY_SIZE(bcm2835_functions)) {
+		dev_err(pc->dev, "%s: invalid brcm,function %d\n",
+			of_node_full_name(np), fnum);
+		return -EINVAL;
+	}
+
+	map->type = PIN_MAP_TYPE_MUX_GROUP;
+	map->data.mux.group = bcm2835_gpio_groups[pin];
+	map->data.mux.function = bcm2835_functions[fnum];
+	(*maps)++;
+
+	return 0;
+}
+
+static int bcm2835_pctl_dt_node_to_map_pull(struct bcm2835_pinctrl *pc,
+		struct device_node *np, u32 pin, u32 pull,
+		struct pinctrl_map **maps)
+{
+	struct pinctrl_map *map = *maps;
+	unsigned long *configs;
+
+	if (pull > 2) {
+		dev_err(pc->dev, "%s: invalid brcm,pull %d\n",
+			of_node_full_name(np), pull);
+		return -EINVAL;
+	}
+
+	configs = kzalloc(sizeof(*configs), GFP_KERNEL);
+	if (!configs)
+		return -ENOMEM;
+	configs[0] = BCM2835_PINCONF_PACK(BCM2835_PINCONF_PARAM_PULL, pull);
+
+	map->type = PIN_MAP_TYPE_CONFIGS_PIN;
+	map->data.configs.group_or_pin = bcm2835_gpio_pins[pin].name;
+	map->data.configs.configs = configs;
+	map->data.configs.num_configs = 1;
+	(*maps)++;
+
+	return 0;
+}
+
+static int bcm2835_pctl_dt_node_to_map(struct pinctrl_dev *pctldev,
+		struct device_node *np,
+		struct pinctrl_map **map, unsigned *num_maps)
+{
+	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
+	struct property *pins, *funcs, *pulls;
+	int num_pins, num_funcs, num_pulls, maps_per_pin;
+	struct pinctrl_map *maps, *cur_map;
+	int i, err;
+	u32 pin, func, pull;
+
+	pins = of_find_property(np, "brcm,pins", NULL);
+	if (!pins) {
+		dev_err(pc->dev, "%s: missing brcm,pins property\n",
+				of_node_full_name(np));
+		return -EINVAL;
+	}
+
+	funcs = of_find_property(np, "brcm,function", NULL);
+	pulls = of_find_property(np, "brcm,pull", NULL);
+
+	if (!funcs && !pulls) {
+		dev_err(pc->dev,
+			"%s: neither brcm,function nor brcm,pull specified\n",
+			of_node_full_name(np));
+		return -EINVAL;
+	}
+
+	num_pins = pins->length / 4;
+	num_funcs = funcs ? (funcs->length / 4) : 0;
+	num_pulls = pulls ? (pulls->length / 4) : 0;
+
+	if (num_funcs > 1 && num_funcs != num_pins) {
+		dev_err(pc->dev,
+			"%s: brcm,function must have 1 or %d entries\n",
+			of_node_full_name(np), num_pins);
+		return -EINVAL;
+	}
+
+	if (num_pulls > 1 && num_pulls != num_pins) {
+		dev_err(pc->dev,
+			"%s: brcm,pull must have 1 or %d entries\n",
+			of_node_full_name(np), num_pins);
+		return -EINVAL;
+	}
+
+	maps_per_pin = 0;
+	if (num_funcs)
+		maps_per_pin++;
+	if (num_pulls)
+		maps_per_pin++;
+	cur_map = maps = kzalloc(num_pins * maps_per_pin * sizeof(*maps),
+				GFP_KERNEL);
+	if (!maps)
+		return -ENOMEM;
+
+	for (i = 0; i < num_pins; i++) {
+		err = of_property_read_u32_index(np, "brcm,pins", i, &pin);
+		if (err)
+			goto out;
+		if (pin >= ARRAY_SIZE(bcm2835_gpio_pins)) {
+			dev_err(pc->dev, "%s: invalid brcm,pins value %d\n",
+				of_node_full_name(np), pin);
+			err = -EINVAL;
+			goto out;
+		}
+
+		if (num_funcs) {
+			err = of_property_read_u32_index(np, "brcm,function",
+					(num_funcs > 1) ? i : 0, &func);
+			if (err)
+				goto out;
+			err = bcm2835_pctl_dt_node_to_map_func(pc, np, pin,
+							func, &cur_map);
+			if (err)
+				goto out;
+		}
+		if (num_pulls) {
+			err = of_property_read_u32_index(np, "brcm,pull",
+					(num_funcs > 1) ? i : 0, &pull);
+			if (err)
+				goto out;
+			err = bcm2835_pctl_dt_node_to_map_pull(pc, np, pin,
+							pull, &cur_map);
+			if (err)
+				goto out;
+		}
+	}
+
+	*map = maps;
+	*num_maps = num_pins * maps_per_pin;
+
+	return 0;
+
+out:
+	kfree(maps);
+	return err;
+}
+
+static const struct pinctrl_ops bcm2835_pctl_ops = {
+	.get_groups_count = bcm2835_pctl_get_groups_count,
+	.get_group_name = bcm2835_pctl_get_group_name,
+	.get_group_pins = bcm2835_pctl_get_group_pins,
+	.pin_dbg_show = bcm2835_pctl_pin_dbg_show,
+	.dt_node_to_map = bcm2835_pctl_dt_node_to_map,
+	.dt_free_map = bcm2835_pctl_dt_free_map,
+};
+
+static int bcm2835_pmx_get_functions_count(struct pinctrl_dev *pctldev)
+{
+	return BCM2835_FSEL_COUNT;
+}
+
+static const char *bcm2835_pmx_get_function_name(struct pinctrl_dev *pctldev,
+		unsigned selector)
+{
+	return bcm2835_functions[selector];
+}
+
+static int bcm2835_pmx_get_function_groups(struct pinctrl_dev *pctldev,
+		unsigned selector,
+		const char * const **groups,
+		unsigned * const num_groups)
+{
+	/* every pin can do every function */
+	*groups = bcm2835_gpio_groups;
+	*num_groups = ARRAY_SIZE(bcm2835_gpio_groups);
+
+	return 0;
+}
+
+static int bcm2835_pmx_set(struct pinctrl_dev *pctldev,
+		unsigned func_selector,
+		unsigned group_selector)
+{
+	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
+
+	bcm2835_pinctrl_fsel_set(pc, group_selector, func_selector);
+
+	return 0;
+}
+
+static void bcm2835_pmx_gpio_disable_free(struct pinctrl_dev *pctldev,
+		struct pinctrl_gpio_range *range,
+		unsigned offset)
+{
+	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
+
+	/* disable by setting to GPIO_IN */
+	bcm2835_pinctrl_fsel_set(pc, offset, BCM2835_FSEL_GPIO_IN);
+}
+
+static int bcm2835_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
+		struct pinctrl_gpio_range *range,
+		unsigned offset,
+		bool input)
+{
+	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
+	enum bcm2835_fsel fsel = input ?
+		BCM2835_FSEL_GPIO_IN : BCM2835_FSEL_GPIO_OUT;
+
+	bcm2835_pinctrl_fsel_set(pc, offset, fsel);
+
+	return 0;
+}
+
+static const struct pinmux_ops bcm2835_pmx_ops = {
+	.get_functions_count = bcm2835_pmx_get_functions_count,
+	.get_function_name = bcm2835_pmx_get_function_name,
+	.get_function_groups = bcm2835_pmx_get_function_groups,
+	.set_mux = bcm2835_pmx_set,
+	.gpio_disable_free = bcm2835_pmx_gpio_disable_free,
+	.gpio_set_direction = bcm2835_pmx_gpio_set_direction,
+};
+
+static int bcm2835_pinconf_get(struct pinctrl_dev *pctldev,
+			unsigned pin, unsigned long *config)
+{
+	/* No way to read back config in HW */
+	return -ENOTSUPP;
+}
+
+static int bcm2835_pinconf_set(struct pinctrl_dev *pctldev,
+			unsigned pin, unsigned long *configs,
+			unsigned num_configs)
+{
+	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
+	enum bcm2835_pinconf_param param;
+	u16 arg;
+	u32 off, bit;
+	int i;
+
+	for (i = 0; i < num_configs; i++) {
+		param = BCM2835_PINCONF_UNPACK_PARAM(configs[i]);
+		arg = BCM2835_PINCONF_UNPACK_ARG(configs[i]);
+
+		if (param != BCM2835_PINCONF_PARAM_PULL)
+			return -EINVAL;
+
+		off = GPIO_REG_OFFSET(pin);
+		bit = GPIO_REG_SHIFT(pin);
+
+		bcm2835_gpio_wr(pc, GPPUD, arg & 3);
+		/*
+		 * Docs say to wait 150 cycles, but not of what. We assume a
+		 * 1 MHz clock here, which is pretty slow...
+		 */
+		udelay(150);
+		bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), BIT(bit));
+		udelay(150);
+		bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), 0);
+	} /* for each config */
+
+	return 0;
+}
+
+static const struct pinconf_ops bcm2835_pinconf_ops = {
+	.pin_config_get = bcm2835_pinconf_get,
+	.pin_config_set = bcm2835_pinconf_set,
+};
+
+static struct pinctrl_desc bcm2835_pinctrl_desc = {
+	.name = MODULE_NAME,
+	.pins = bcm2835_gpio_pins,
+	.npins = ARRAY_SIZE(bcm2835_gpio_pins),
+	.pctlops = &bcm2835_pctl_ops,
+	.pmxops = &bcm2835_pmx_ops,
+	.confops = &bcm2835_pinconf_ops,
+	.owner = THIS_MODULE,
+};
+
+static struct pinctrl_gpio_range bcm2835_pinctrl_gpio_range = {
+	.name = MODULE_NAME,
+	.npins = BCM2835_NUM_GPIOS,
+};
+
+static int bcm2835_pinctrl_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct bcm2835_pinctrl *pc;
+	struct resource iomem;
+	int err, i;
+	BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_pins) != BCM2835_NUM_GPIOS);
+	BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_groups) != BCM2835_NUM_GPIOS);
+
+	pc = devm_kzalloc(dev, sizeof(*pc), GFP_KERNEL);
+	if (!pc)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, pc);
+	pc->dev = dev;
+
+	err = of_address_to_resource(np, 0, &iomem);
+	if (err) {
+		dev_err(dev, "could not get IO memory\n");
+		return err;
+	}
+
+	pc->base = devm_ioremap_resource(dev, &iomem);
+	if (IS_ERR(pc->base))
+		return PTR_ERR(pc->base);
+
+	pc->gpio_chip = bcm2835_gpio_chip;
+	pc->gpio_chip.dev = dev;
+	pc->gpio_chip.of_node = np;
+
+	pc->irq_domain = irq_domain_add_linear(np, BCM2835_NUM_GPIOS,
+			&irq_domain_simple_ops, NULL);
+	if (!pc->irq_domain) {
+		dev_err(dev, "could not create IRQ domain\n");
+		return -ENOMEM;
+	}
+
+	for (i = 0; i < BCM2835_NUM_GPIOS; i++) {
+		int irq = irq_create_mapping(pc->irq_domain, i);
+		irq_set_lockdep_class(irq, &gpio_lock_class);
+		irq_set_chip_and_handler(irq, &bcm2835_gpio_irq_chip,
+				handle_simple_irq);
+		irq_set_chip_data(irq, pc);
+		set_irq_flags(irq, IRQF_VALID);
+	}
+
+	for (i = 0; i < BCM2835_NUM_BANKS; i++) {
+		unsigned long events;
+		unsigned offset;
+		int len;
+		char *name;
+
+		/* clear event detection flags */
+		bcm2835_gpio_wr(pc, GPREN0 + i * 4, 0);
+		bcm2835_gpio_wr(pc, GPFEN0 + i * 4, 0);
+		bcm2835_gpio_wr(pc, GPHEN0 + i * 4, 0);
+		bcm2835_gpio_wr(pc, GPLEN0 + i * 4, 0);
+		bcm2835_gpio_wr(pc, GPAREN0 + i * 4, 0);
+		bcm2835_gpio_wr(pc, GPAFEN0 + i * 4, 0);
+
+		/* clear all the events */
+		events = bcm2835_gpio_rd(pc, GPEDS0 + i * 4);
+		for_each_set_bit(offset, &events, 32)
+			bcm2835_gpio_wr(pc, GPEDS0 + i * 4, BIT(offset));
+
+		pc->irq[i] = irq_of_parse_and_map(np, i);
+		pc->irq_data[i].pc = pc;
+		pc->irq_data[i].bank = i;
+		spin_lock_init(&pc->irq_lock[i]);
+
+		len = strlen(dev_name(pc->dev)) + 16;
+		name = devm_kzalloc(pc->dev, len, GFP_KERNEL);
+		if (!name)
+			return -ENOMEM;
+		snprintf(name, len, "%s:bank%d", dev_name(pc->dev), i);
+
+		err = devm_request_irq(dev, pc->irq[i],
+			bcm2835_gpio_irq_handler, IRQF_SHARED,
+			name, &pc->irq_data[i]);
+		if (err) {
+			dev_err(dev, "unable to request IRQ %d\n", pc->irq[i]);
+			return err;
+		}
+	}
+
+	err = gpiochip_add(&pc->gpio_chip);
+	if (err) {
+		dev_err(dev, "could not add GPIO chip\n");
+		return err;
+	}
+
+	pc->pctl_dev = pinctrl_register(&bcm2835_pinctrl_desc, dev, pc);
+	if (!pc->pctl_dev) {
+		gpiochip_remove(&pc->gpio_chip);
+		return -EINVAL;
+	}
+
+	pc->gpio_range = bcm2835_pinctrl_gpio_range;
+	pc->gpio_range.base = pc->gpio_chip.base;
+	pc->gpio_range.gc = &pc->gpio_chip;
+	pinctrl_add_gpio_range(pc->pctl_dev, &pc->gpio_range);
+
+	return 0;
+}
+
+static int bcm2835_pinctrl_remove(struct platform_device *pdev)
+{
+	struct bcm2835_pinctrl *pc = platform_get_drvdata(pdev);
+
+	pinctrl_unregister(pc->pctl_dev);
+	gpiochip_remove(&pc->gpio_chip);
+
+	return 0;
+}
+
+static struct of_device_id bcm2835_pinctrl_match[] = {
+	{ .compatible = "brcm,bcm2835-gpio" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, bcm2835_pinctrl_match);
+
+static struct platform_driver bcm2835_pinctrl_driver = {
+	.probe = bcm2835_pinctrl_probe,
+	.remove = bcm2835_pinctrl_remove,
+	.driver = {
+		.name = MODULE_NAME,
+		.of_match_table = bcm2835_pinctrl_match,
+	},
+};
+module_platform_driver(bcm2835_pinctrl_driver);
+
+MODULE_AUTHOR("Chris Boot, Simon Arlott, Stephen Warren");
+MODULE_DESCRIPTION("BCM2835 Pin control driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/pinctrl/pinctrl-bcm281xx.c b/drivers/pinctrl/pinctrl-bcm281xx.c
deleted file mode 100644
index fa2a00f..0000000
--- a/drivers/pinctrl/pinctrl-bcm281xx.c
+++ /dev/null
@@ -1,1455 +0,0 @@
-/*
- * Copyright (C) 2013 Broadcom Corporation
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation version 2.
- *
- * This program is distributed "as is" WITHOUT ANY WARRANTY of any
- * kind, whether express or implied; without even the implied warranty
- * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
-#include <linux/err.h>
-#include <linux/io.h>
-#include <linux/module.h>
-#include <linux/of.h>
-#include <linux/platform_device.h>
-#include <linux/pinctrl/pinctrl.h>
-#include <linux/pinctrl/pinmux.h>
-#include <linux/pinctrl/pinconf.h>
-#include <linux/pinctrl/pinconf-generic.h>
-#include <linux/regmap.h>
-#include <linux/slab.h>
-#include "core.h"
-#include "pinctrl-utils.h"
-
-/* BCM281XX Pin Control Registers Definitions */
-
-/* Function Select bits are the same for all pin control registers */
-#define BCM281XX_PIN_REG_F_SEL_MASK		0x0700
-#define BCM281XX_PIN_REG_F_SEL_SHIFT		8
-
-/* Standard pin register */
-#define BCM281XX_STD_PIN_REG_DRV_STR_MASK	0x0007
-#define BCM281XX_STD_PIN_REG_DRV_STR_SHIFT	0
-#define BCM281XX_STD_PIN_REG_INPUT_DIS_MASK	0x0008
-#define BCM281XX_STD_PIN_REG_INPUT_DIS_SHIFT	3
-#define BCM281XX_STD_PIN_REG_SLEW_MASK		0x0010
-#define BCM281XX_STD_PIN_REG_SLEW_SHIFT		4
-#define BCM281XX_STD_PIN_REG_PULL_UP_MASK	0x0020
-#define BCM281XX_STD_PIN_REG_PULL_UP_SHIFT	5
-#define BCM281XX_STD_PIN_REG_PULL_DN_MASK	0x0040
-#define BCM281XX_STD_PIN_REG_PULL_DN_SHIFT	6
-#define BCM281XX_STD_PIN_REG_HYST_MASK		0x0080
-#define BCM281XX_STD_PIN_REG_HYST_SHIFT		7
-
-/* I2C pin register */
-#define BCM281XX_I2C_PIN_REG_INPUT_DIS_MASK	0x0004
-#define BCM281XX_I2C_PIN_REG_INPUT_DIS_SHIFT	2
-#define BCM281XX_I2C_PIN_REG_SLEW_MASK		0x0008
-#define BCM281XX_I2C_PIN_REG_SLEW_SHIFT		3
-#define BCM281XX_I2C_PIN_REG_PULL_UP_STR_MASK	0x0070
-#define BCM281XX_I2C_PIN_REG_PULL_UP_STR_SHIFT	4
-
-/* HDMI pin register */
-#define BCM281XX_HDMI_PIN_REG_INPUT_DIS_MASK	0x0008
-#define BCM281XX_HDMI_PIN_REG_INPUT_DIS_SHIFT	3
-#define BCM281XX_HDMI_PIN_REG_MODE_MASK		0x0010
-#define BCM281XX_HDMI_PIN_REG_MODE_SHIFT	4
-
-/**
- * bcm281xx_pin_type - types of pin register
- */
-enum bcm281xx_pin_type {
-	BCM281XX_PIN_TYPE_UNKNOWN = 0,
-	BCM281XX_PIN_TYPE_STD,
-	BCM281XX_PIN_TYPE_I2C,
-	BCM281XX_PIN_TYPE_HDMI,
-};
-
-static enum bcm281xx_pin_type std_pin = BCM281XX_PIN_TYPE_STD;
-static enum bcm281xx_pin_type i2c_pin = BCM281XX_PIN_TYPE_I2C;
-static enum bcm281xx_pin_type hdmi_pin = BCM281XX_PIN_TYPE_HDMI;
-
-/**
- * bcm281xx_pin_function- define pin function
- */
-struct bcm281xx_pin_function {
-	const char *name;
-	const char * const *groups;
-	const unsigned ngroups;
-};
-
-/**
- * bcm281xx_pinctrl_data - Broadcom-specific pinctrl data
- * @reg_base - base of pinctrl registers
- */
-struct bcm281xx_pinctrl_data {
-	void __iomem *reg_base;
-
-	/* List of all pins */
-	const struct pinctrl_pin_desc *pins;
-	const unsigned npins;
-
-	const struct bcm281xx_pin_function *functions;
-	const unsigned nfunctions;
-
-	struct regmap *regmap;
-};
-
-/*
- * Pin number definition.  The order here must be the same as defined in the
- * PADCTRLREG block in the RDB.
- */
-#define BCM281XX_PIN_ADCSYNC		0
-#define BCM281XX_PIN_BAT_RM		1
-#define BCM281XX_PIN_BSC1_SCL		2
-#define BCM281XX_PIN_BSC1_SDA		3
-#define BCM281XX_PIN_BSC2_SCL		4
-#define BCM281XX_PIN_BSC2_SDA		5
-#define BCM281XX_PIN_CLASSGPWR		6
-#define BCM281XX_PIN_CLK_CX8		7
-#define BCM281XX_PIN_CLKOUT_0		8
-#define BCM281XX_PIN_CLKOUT_1		9
-#define BCM281XX_PIN_CLKOUT_2		10
-#define BCM281XX_PIN_CLKOUT_3		11
-#define BCM281XX_PIN_CLKREQ_IN_0	12
-#define BCM281XX_PIN_CLKREQ_IN_1	13
-#define BCM281XX_PIN_CWS_SYS_REQ1	14
-#define BCM281XX_PIN_CWS_SYS_REQ2	15
-#define BCM281XX_PIN_CWS_SYS_REQ3	16
-#define BCM281XX_PIN_DIGMIC1_CLK	17
-#define BCM281XX_PIN_DIGMIC1_DQ		18
-#define BCM281XX_PIN_DIGMIC2_CLK	19
-#define BCM281XX_PIN_DIGMIC2_DQ		20
-#define BCM281XX_PIN_GPEN13		21
-#define BCM281XX_PIN_GPEN14		22
-#define BCM281XX_PIN_GPEN15		23
-#define BCM281XX_PIN_GPIO00		24
-#define BCM281XX_PIN_GPIO01		25
-#define BCM281XX_PIN_GPIO02		26
-#define BCM281XX_PIN_GPIO03		27
-#define BCM281XX_PIN_GPIO04		28
-#define BCM281XX_PIN_GPIO05		29
-#define BCM281XX_PIN_GPIO06		30
-#define BCM281XX_PIN_GPIO07		31
-#define BCM281XX_PIN_GPIO08		32
-#define BCM281XX_PIN_GPIO09		33
-#define BCM281XX_PIN_GPIO10		34
-#define BCM281XX_PIN_GPIO11		35
-#define BCM281XX_PIN_GPIO12		36
-#define BCM281XX_PIN_GPIO13		37
-#define BCM281XX_PIN_GPIO14		38
-#define BCM281XX_PIN_GPS_PABLANK	39
-#define BCM281XX_PIN_GPS_TMARK		40
-#define BCM281XX_PIN_HDMI_SCL		41
-#define BCM281XX_PIN_HDMI_SDA		42
-#define BCM281XX_PIN_IC_DM		43
-#define BCM281XX_PIN_IC_DP		44
-#define BCM281XX_PIN_KP_COL_IP_0	45
-#define BCM281XX_PIN_KP_COL_IP_1	46
-#define BCM281XX_PIN_KP_COL_IP_2	47
-#define BCM281XX_PIN_KP_COL_IP_3	48
-#define BCM281XX_PIN_KP_ROW_OP_0	49
-#define BCM281XX_PIN_KP_ROW_OP_1	50
-#define BCM281XX_PIN_KP_ROW_OP_2	51
-#define BCM281XX_PIN_KP_ROW_OP_3	52
-#define BCM281XX_PIN_LCD_B_0		53
-#define BCM281XX_PIN_LCD_B_1		54
-#define BCM281XX_PIN_LCD_B_2		55
-#define BCM281XX_PIN_LCD_B_3		56
-#define BCM281XX_PIN_LCD_B_4		57
-#define BCM281XX_PIN_LCD_B_5		58
-#define BCM281XX_PIN_LCD_B_6		59
-#define BCM281XX_PIN_LCD_B_7		60
-#define BCM281XX_PIN_LCD_G_0		61
-#define BCM281XX_PIN_LCD_G_1		62
-#define BCM281XX_PIN_LCD_G_2		63
-#define BCM281XX_PIN_LCD_G_3		64
-#define BCM281XX_PIN_LCD_G_4		65
-#define BCM281XX_PIN_LCD_G_5		66
-#define BCM281XX_PIN_LCD_G_6		67
-#define BCM281XX_PIN_LCD_G_7		68
-#define BCM281XX_PIN_LCD_HSYNC		69
-#define BCM281XX_PIN_LCD_OE		70
-#define BCM281XX_PIN_LCD_PCLK		71
-#define BCM281XX_PIN_LCD_R_0		72
-#define BCM281XX_PIN_LCD_R_1		73
-#define BCM281XX_PIN_LCD_R_2		74
-#define BCM281XX_PIN_LCD_R_3		75
-#define BCM281XX_PIN_LCD_R_4		76
-#define BCM281XX_PIN_LCD_R_5		77
-#define BCM281XX_PIN_LCD_R_6		78
-#define BCM281XX_PIN_LCD_R_7		79
-#define BCM281XX_PIN_LCD_VSYNC		80
-#define BCM281XX_PIN_MDMGPIO0		81
-#define BCM281XX_PIN_MDMGPIO1		82
-#define BCM281XX_PIN_MDMGPIO2		83
-#define BCM281XX_PIN_MDMGPIO3		84
-#define BCM281XX_PIN_MDMGPIO4		85
-#define BCM281XX_PIN_MDMGPIO5		86
-#define BCM281XX_PIN_MDMGPIO6		87
-#define BCM281XX_PIN_MDMGPIO7		88
-#define BCM281XX_PIN_MDMGPIO8		89
-#define BCM281XX_PIN_MPHI_DATA_0	90
-#define BCM281XX_PIN_MPHI_DATA_1	91
-#define BCM281XX_PIN_MPHI_DATA_2	92
-#define BCM281XX_PIN_MPHI_DATA_3	93
-#define BCM281XX_PIN_MPHI_DATA_4	94
-#define BCM281XX_PIN_MPHI_DATA_5	95
-#define BCM281XX_PIN_MPHI_DATA_6	96
-#define BCM281XX_PIN_MPHI_DATA_7	97
-#define BCM281XX_PIN_MPHI_DATA_8	98
-#define BCM281XX_PIN_MPHI_DATA_9	99
-#define BCM281XX_PIN_MPHI_DATA_10	100
-#define BCM281XX_PIN_MPHI_DATA_11	101
-#define BCM281XX_PIN_MPHI_DATA_12	102
-#define BCM281XX_PIN_MPHI_DATA_13	103
-#define BCM281XX_PIN_MPHI_DATA_14	104
-#define BCM281XX_PIN_MPHI_DATA_15	105
-#define BCM281XX_PIN_MPHI_HA0		106
-#define BCM281XX_PIN_MPHI_HAT0		107
-#define BCM281XX_PIN_MPHI_HAT1		108
-#define BCM281XX_PIN_MPHI_HCE0_N	109
-#define BCM281XX_PIN_MPHI_HCE1_N	110
-#define BCM281XX_PIN_MPHI_HRD_N		111
-#define BCM281XX_PIN_MPHI_HWR_N		112
-#define BCM281XX_PIN_MPHI_RUN0		113
-#define BCM281XX_PIN_MPHI_RUN1		114
-#define BCM281XX_PIN_MTX_SCAN_CLK	115
-#define BCM281XX_PIN_MTX_SCAN_DATA	116
-#define BCM281XX_PIN_NAND_AD_0		117
-#define BCM281XX_PIN_NAND_AD_1		118
-#define BCM281XX_PIN_NAND_AD_2		119
-#define BCM281XX_PIN_NAND_AD_3		120
-#define BCM281XX_PIN_NAND_AD_4		121
-#define BCM281XX_PIN_NAND_AD_5		122
-#define BCM281XX_PIN_NAND_AD_6		123
-#define BCM281XX_PIN_NAND_AD_7		124
-#define BCM281XX_PIN_NAND_ALE		125
-#define BCM281XX_PIN_NAND_CEN_0		126
-#define BCM281XX_PIN_NAND_CEN_1		127
-#define BCM281XX_PIN_NAND_CLE		128
-#define BCM281XX_PIN_NAND_OEN		129
-#define BCM281XX_PIN_NAND_RDY_0		130
-#define BCM281XX_PIN_NAND_RDY_1		131
-#define BCM281XX_PIN_NAND_WEN		132
-#define BCM281XX_PIN_NAND_WP		133
-#define BCM281XX_PIN_PC1		134
-#define BCM281XX_PIN_PC2		135
-#define BCM281XX_PIN_PMU_INT		136
-#define BCM281XX_PIN_PMU_SCL		137
-#define BCM281XX_PIN_PMU_SDA		138
-#define BCM281XX_PIN_RFST2G_MTSLOTEN3G	139
-#define BCM281XX_PIN_RGMII_0_RX_CTL	140
-#define BCM281XX_PIN_RGMII_0_RXC	141
-#define BCM281XX_PIN_RGMII_0_RXD_0	142
-#define BCM281XX_PIN_RGMII_0_RXD_1	143
-#define BCM281XX_PIN_RGMII_0_RXD_2	144
-#define BCM281XX_PIN_RGMII_0_RXD_3	145
-#define BCM281XX_PIN_RGMII_0_TX_CTL	146
-#define BCM281XX_PIN_RGMII_0_TXC	147
-#define BCM281XX_PIN_RGMII_0_TXD_0	148
-#define BCM281XX_PIN_RGMII_0_TXD_1	149
-#define BCM281XX_PIN_RGMII_0_TXD_2	150
-#define BCM281XX_PIN_RGMII_0_TXD_3	151
-#define BCM281XX_PIN_RGMII_1_RX_CTL	152
-#define BCM281XX_PIN_RGMII_1_RXC	153
-#define BCM281XX_PIN_RGMII_1_RXD_0	154
-#define BCM281XX_PIN_RGMII_1_RXD_1	155
-#define BCM281XX_PIN_RGMII_1_RXD_2	156
-#define BCM281XX_PIN_RGMII_1_RXD_3	157
-#define BCM281XX_PIN_RGMII_1_TX_CTL	158
-#define BCM281XX_PIN_RGMII_1_TXC	159
-#define BCM281XX_PIN_RGMII_1_TXD_0	160
-#define BCM281XX_PIN_RGMII_1_TXD_1	161
-#define BCM281XX_PIN_RGMII_1_TXD_2	162
-#define BCM281XX_PIN_RGMII_1_TXD_3	163
-#define BCM281XX_PIN_RGMII_GPIO_0	164
-#define BCM281XX_PIN_RGMII_GPIO_1	165
-#define BCM281XX_PIN_RGMII_GPIO_2	166
-#define BCM281XX_PIN_RGMII_GPIO_3	167
-#define BCM281XX_PIN_RTXDATA2G_TXDATA3G1	168
-#define BCM281XX_PIN_RTXEN2G_TXDATA3G2	169
-#define BCM281XX_PIN_RXDATA3G0		170
-#define BCM281XX_PIN_RXDATA3G1		171
-#define BCM281XX_PIN_RXDATA3G2		172
-#define BCM281XX_PIN_SDIO1_CLK		173
-#define BCM281XX_PIN_SDIO1_CMD		174
-#define BCM281XX_PIN_SDIO1_DATA_0	175
-#define BCM281XX_PIN_SDIO1_DATA_1	176
-#define BCM281XX_PIN_SDIO1_DATA_2	177
-#define BCM281XX_PIN_SDIO1_DATA_3	178
-#define BCM281XX_PIN_SDIO4_CLK		179
-#define BCM281XX_PIN_SDIO4_CMD		180
-#define BCM281XX_PIN_SDIO4_DATA_0	181
-#define BCM281XX_PIN_SDIO4_DATA_1	182
-#define BCM281XX_PIN_SDIO4_DATA_2	183
-#define BCM281XX_PIN_SDIO4_DATA_3	184
-#define BCM281XX_PIN_SIM_CLK		185
-#define BCM281XX_PIN_SIM_DATA		186
-#define BCM281XX_PIN_SIM_DET		187
-#define BCM281XX_PIN_SIM_RESETN		188
-#define BCM281XX_PIN_SIM2_CLK		189
-#define BCM281XX_PIN_SIM2_DATA		190
-#define BCM281XX_PIN_SIM2_DET		191
-#define BCM281XX_PIN_SIM2_RESETN	192
-#define BCM281XX_PIN_SRI_C		193
-#define BCM281XX_PIN_SRI_D		194
-#define BCM281XX_PIN_SRI_E		195
-#define BCM281XX_PIN_SSP_EXTCLK		196
-#define BCM281XX_PIN_SSP0_CLK		197
-#define BCM281XX_PIN_SSP0_FS		198
-#define BCM281XX_PIN_SSP0_RXD		199
-#define BCM281XX_PIN_SSP0_TXD		200
-#define BCM281XX_PIN_SSP2_CLK		201
-#define BCM281XX_PIN_SSP2_FS_0		202
-#define BCM281XX_PIN_SSP2_FS_1		203
-#define BCM281XX_PIN_SSP2_FS_2		204
-#define BCM281XX_PIN_SSP2_FS_3		205
-#define BCM281XX_PIN_SSP2_RXD_0		206
-#define BCM281XX_PIN_SSP2_RXD_1		207
-#define BCM281XX_PIN_SSP2_TXD_0		208
-#define BCM281XX_PIN_SSP2_TXD_1		209
-#define BCM281XX_PIN_SSP3_CLK		210
-#define BCM281XX_PIN_SSP3_FS		211
-#define BCM281XX_PIN_SSP3_RXD		212
-#define BCM281XX_PIN_SSP3_TXD		213
-#define BCM281XX_PIN_SSP4_CLK		214
-#define BCM281XX_PIN_SSP4_FS		215
-#define BCM281XX_PIN_SSP4_RXD		216
-#define BCM281XX_PIN_SSP4_TXD		217
-#define BCM281XX_PIN_SSP5_CLK		218
-#define BCM281XX_PIN_SSP5_FS		219
-#define BCM281XX_PIN_SSP5_RXD		220
-#define BCM281XX_PIN_SSP5_TXD		221
-#define BCM281XX_PIN_SSP6_CLK		222
-#define BCM281XX_PIN_SSP6_FS		223
-#define BCM281XX_PIN_SSP6_RXD		224
-#define BCM281XX_PIN_SSP6_TXD		225
-#define BCM281XX_PIN_STAT_1		226
-#define BCM281XX_PIN_STAT_2		227
-#define BCM281XX_PIN_SYSCLKEN		228
-#define BCM281XX_PIN_TRACECLK		229
-#define BCM281XX_PIN_TRACEDT00		230
-#define BCM281XX_PIN_TRACEDT01		231
-#define BCM281XX_PIN_TRACEDT02		232
-#define BCM281XX_PIN_TRACEDT03		233
-#define BCM281XX_PIN_TRACEDT04		234
-#define BCM281XX_PIN_TRACEDT05		235
-#define BCM281XX_PIN_TRACEDT06		236
-#define BCM281XX_PIN_TRACEDT07		237
-#define BCM281XX_PIN_TRACEDT08		238
-#define BCM281XX_PIN_TRACEDT09		239
-#define BCM281XX_PIN_TRACEDT10		240
-#define BCM281XX_PIN_TRACEDT11		241
-#define BCM281XX_PIN_TRACEDT12		242
-#define BCM281XX_PIN_TRACEDT13		243
-#define BCM281XX_PIN_TRACEDT14		244
-#define BCM281XX_PIN_TRACEDT15		245
-#define BCM281XX_PIN_TXDATA3G0		246
-#define BCM281XX_PIN_TXPWRIND		247
-#define BCM281XX_PIN_UARTB1_UCTS	248
-#define BCM281XX_PIN_UARTB1_URTS	249
-#define BCM281XX_PIN_UARTB1_URXD	250
-#define BCM281XX_PIN_UARTB1_UTXD	251
-#define BCM281XX_PIN_UARTB2_URXD	252
-#define BCM281XX_PIN_UARTB2_UTXD	253
-#define BCM281XX_PIN_UARTB3_UCTS	254
-#define BCM281XX_PIN_UARTB3_URTS	255
-#define BCM281XX_PIN_UARTB3_URXD	256
-#define BCM281XX_PIN_UARTB3_UTXD	257
-#define BCM281XX_PIN_UARTB4_UCTS	258
-#define BCM281XX_PIN_UARTB4_URTS	259
-#define BCM281XX_PIN_UARTB4_URXD	260
-#define BCM281XX_PIN_UARTB4_UTXD	261
-#define BCM281XX_PIN_VC_CAM1_SCL	262
-#define BCM281XX_PIN_VC_CAM1_SDA	263
-#define BCM281XX_PIN_VC_CAM2_SCL	264
-#define BCM281XX_PIN_VC_CAM2_SDA	265
-#define BCM281XX_PIN_VC_CAM3_SCL	266
-#define BCM281XX_PIN_VC_CAM3_SDA	267
-
-#define BCM281XX_PIN_DESC(a, b, c) \
-	{ .number = a, .name = b, .drv_data = &c##_pin }
-
-/*
- * Pin description definition.  The order here must be the same as defined in
- * the PADCTRLREG block in the RDB, since the pin number is used as an index
- * into this array.
- */
-static const struct pinctrl_pin_desc bcm281xx_pinctrl_pins[] = {
-	BCM281XX_PIN_DESC(BCM281XX_PIN_ADCSYNC, "adcsync", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_BAT_RM, "bat_rm", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_BSC1_SCL, "bsc1_scl", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_BSC1_SDA, "bsc1_sda", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_BSC2_SCL, "bsc2_scl", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_BSC2_SDA, "bsc2_sda", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CLASSGPWR, "classgpwr", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CLK_CX8, "clk_cx8", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKOUT_0, "clkout_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKOUT_1, "clkout_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKOUT_2, "clkout_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKOUT_3, "clkout_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKREQ_IN_0, "clkreq_in_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKREQ_IN_1, "clkreq_in_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CWS_SYS_REQ1, "cws_sys_req1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CWS_SYS_REQ2, "cws_sys_req2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CWS_SYS_REQ3, "cws_sys_req3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_DIGMIC1_CLK, "digmic1_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_DIGMIC1_DQ, "digmic1_dq", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_DIGMIC2_CLK, "digmic2_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_DIGMIC2_DQ, "digmic2_dq", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPEN13, "gpen13", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPEN14, "gpen14", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPEN15, "gpen15", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO00, "gpio00", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO01, "gpio01", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO02, "gpio02", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO03, "gpio03", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO04, "gpio04", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO05, "gpio05", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO06, "gpio06", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO07, "gpio07", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO08, "gpio08", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO09, "gpio09", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO10, "gpio10", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO11, "gpio11", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO12, "gpio12", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO13, "gpio13", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO14, "gpio14", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPS_PABLANK, "gps_pablank", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPS_TMARK, "gps_tmark", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_HDMI_SCL, "hdmi_scl", hdmi),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_HDMI_SDA, "hdmi_sda", hdmi),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_IC_DM, "ic_dm", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_IC_DP, "ic_dp", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_COL_IP_0, "kp_col_ip_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_COL_IP_1, "kp_col_ip_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_COL_IP_2, "kp_col_ip_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_COL_IP_3, "kp_col_ip_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_ROW_OP_0, "kp_row_op_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_ROW_OP_1, "kp_row_op_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_ROW_OP_2, "kp_row_op_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_ROW_OP_3, "kp_row_op_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_0, "lcd_b_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_1, "lcd_b_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_2, "lcd_b_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_3, "lcd_b_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_4, "lcd_b_4", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_5, "lcd_b_5", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_6, "lcd_b_6", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_7, "lcd_b_7", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_0, "lcd_g_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_1, "lcd_g_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_2, "lcd_g_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_3, "lcd_g_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_4, "lcd_g_4", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_5, "lcd_g_5", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_6, "lcd_g_6", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_7, "lcd_g_7", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_HSYNC, "lcd_hsync", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_OE, "lcd_oe", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_PCLK, "lcd_pclk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_0, "lcd_r_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_1, "lcd_r_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_2, "lcd_r_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_3, "lcd_r_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_4, "lcd_r_4", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_5, "lcd_r_5", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_6, "lcd_r_6", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_7, "lcd_r_7", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_VSYNC, "lcd_vsync", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO0, "mdmgpio0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO1, "mdmgpio1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO2, "mdmgpio2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO3, "mdmgpio3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO4, "mdmgpio4", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO5, "mdmgpio5", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO6, "mdmgpio6", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO7, "mdmgpio7", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO8, "mdmgpio8", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_0, "mphi_data_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_1, "mphi_data_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_2, "mphi_data_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_3, "mphi_data_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_4, "mphi_data_4", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_5, "mphi_data_5", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_6, "mphi_data_6", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_7, "mphi_data_7", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_8, "mphi_data_8", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_9, "mphi_data_9", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_10, "mphi_data_10", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_11, "mphi_data_11", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_12, "mphi_data_12", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_13, "mphi_data_13", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_14, "mphi_data_14", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_15, "mphi_data_15", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HA0, "mphi_ha0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HAT0, "mphi_hat0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HAT1, "mphi_hat1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HCE0_N, "mphi_hce0_n", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HCE1_N, "mphi_hce1_n", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HRD_N, "mphi_hrd_n", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HWR_N, "mphi_hwr_n", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_RUN0, "mphi_run0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_RUN1, "mphi_run1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MTX_SCAN_CLK, "mtx_scan_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MTX_SCAN_DATA, "mtx_scan_data", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_0, "nand_ad_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_1, "nand_ad_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_2, "nand_ad_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_3, "nand_ad_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_4, "nand_ad_4", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_5, "nand_ad_5", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_6, "nand_ad_6", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_7, "nand_ad_7", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_ALE, "nand_ale", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_CEN_0, "nand_cen_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_CEN_1, "nand_cen_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_CLE, "nand_cle", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_OEN, "nand_oen", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_RDY_0, "nand_rdy_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_RDY_1, "nand_rdy_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_WEN, "nand_wen", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_WP, "nand_wp", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_PC1, "pc1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_PC2, "pc2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_PMU_INT, "pmu_int", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_PMU_SCL, "pmu_scl", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_PMU_SDA, "pmu_sda", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RFST2G_MTSLOTEN3G, "rfst2g_mtsloten3g",
-		std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RX_CTL, "rgmii_0_rx_ctl", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXC, "rgmii_0_rxc", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXD_0, "rgmii_0_rxd_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXD_1, "rgmii_0_rxd_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXD_2, "rgmii_0_rxd_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXD_3, "rgmii_0_rxd_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TX_CTL, "rgmii_0_tx_ctl", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXC, "rgmii_0_txc", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXD_0, "rgmii_0_txd_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXD_1, "rgmii_0_txd_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXD_2, "rgmii_0_txd_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXD_3, "rgmii_0_txd_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RX_CTL, "rgmii_1_rx_ctl", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXC, "rgmii_1_rxc", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXD_0, "rgmii_1_rxd_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXD_1, "rgmii_1_rxd_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXD_2, "rgmii_1_rxd_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXD_3, "rgmii_1_rxd_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TX_CTL, "rgmii_1_tx_ctl", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXC, "rgmii_1_txc", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXD_0, "rgmii_1_txd_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXD_1, "rgmii_1_txd_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXD_2, "rgmii_1_txd_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXD_3, "rgmii_1_txd_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_GPIO_0, "rgmii_gpio_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_GPIO_1, "rgmii_gpio_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_GPIO_2, "rgmii_gpio_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_GPIO_3, "rgmii_gpio_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RTXDATA2G_TXDATA3G1,
-		"rtxdata2g_txdata3g1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RTXEN2G_TXDATA3G2, "rtxen2g_txdata3g2",
-		std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RXDATA3G0, "rxdata3g0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RXDATA3G1, "rxdata3g1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RXDATA3G2, "rxdata3g2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_CLK, "sdio1_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_CMD, "sdio1_cmd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_DATA_0, "sdio1_data_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_DATA_1, "sdio1_data_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_DATA_2, "sdio1_data_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_DATA_3, "sdio1_data_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_CLK, "sdio4_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_CMD, "sdio4_cmd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_DATA_0, "sdio4_data_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_DATA_1, "sdio4_data_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_DATA_2, "sdio4_data_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_DATA_3, "sdio4_data_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM_CLK, "sim_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM_DATA, "sim_data", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM_DET, "sim_det", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM_RESETN, "sim_resetn", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM2_CLK, "sim2_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM2_DATA, "sim2_data", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM2_DET, "sim2_det", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM2_RESETN, "sim2_resetn", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SRI_C, "sri_c", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SRI_D, "sri_d", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SRI_E, "sri_e", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP_EXTCLK, "ssp_extclk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP0_CLK, "ssp0_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP0_FS, "ssp0_fs", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP0_RXD, "ssp0_rxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP0_TXD, "ssp0_txd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_CLK, "ssp2_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_FS_0, "ssp2_fs_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_FS_1, "ssp2_fs_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_FS_2, "ssp2_fs_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_FS_3, "ssp2_fs_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_RXD_0, "ssp2_rxd_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_RXD_1, "ssp2_rxd_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_TXD_0, "ssp2_txd_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_TXD_1, "ssp2_txd_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP3_CLK, "ssp3_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP3_FS, "ssp3_fs", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP3_RXD, "ssp3_rxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP3_TXD, "ssp3_txd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP4_CLK, "ssp4_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP4_FS, "ssp4_fs", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP4_RXD, "ssp4_rxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP4_TXD, "ssp4_txd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP5_CLK, "ssp5_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP5_FS, "ssp5_fs", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP5_RXD, "ssp5_rxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP5_TXD, "ssp5_txd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP6_CLK, "ssp6_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP6_FS, "ssp6_fs", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP6_RXD, "ssp6_rxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP6_TXD, "ssp6_txd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_STAT_1, "stat_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_STAT_2, "stat_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SYSCLKEN, "sysclken", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACECLK, "traceclk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT00, "tracedt00", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT01, "tracedt01", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT02, "tracedt02", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT03, "tracedt03", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT04, "tracedt04", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT05, "tracedt05", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT06, "tracedt06", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT07, "tracedt07", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT08, "tracedt08", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT09, "tracedt09", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT10, "tracedt10", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT11, "tracedt11", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT12, "tracedt12", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT13, "tracedt13", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT14, "tracedt14", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT15, "tracedt15", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TXDATA3G0, "txdata3g0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TXPWRIND, "txpwrind", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB1_UCTS, "uartb1_ucts", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB1_URTS, "uartb1_urts", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB1_URXD, "uartb1_urxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB1_UTXD, "uartb1_utxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB2_URXD, "uartb2_urxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB2_UTXD, "uartb2_utxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB3_UCTS, "uartb3_ucts", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB3_URTS, "uartb3_urts", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB3_URXD, "uartb3_urxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB3_UTXD, "uartb3_utxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB4_UCTS, "uartb4_ucts", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB4_URTS, "uartb4_urts", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB4_URXD, "uartb4_urxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB4_UTXD, "uartb4_utxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM1_SCL, "vc_cam1_scl", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM1_SDA, "vc_cam1_sda", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM2_SCL, "vc_cam2_scl", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM2_SDA, "vc_cam2_sda", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM3_SCL, "vc_cam3_scl", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM3_SDA, "vc_cam3_sda", i2c),
-};
-
-static const char * const bcm281xx_alt_groups[] = {
-	"adcsync",
-	"bat_rm",
-	"bsc1_scl",
-	"bsc1_sda",
-	"bsc2_scl",
-	"bsc2_sda",
-	"classgpwr",
-	"clk_cx8",
-	"clkout_0",
-	"clkout_1",
-	"clkout_2",
-	"clkout_3",
-	"clkreq_in_0",
-	"clkreq_in_1",
-	"cws_sys_req1",
-	"cws_sys_req2",
-	"cws_sys_req3",
-	"digmic1_clk",
-	"digmic1_dq",
-	"digmic2_clk",
-	"digmic2_dq",
-	"gpen13",
-	"gpen14",
-	"gpen15",
-	"gpio00",
-	"gpio01",
-	"gpio02",
-	"gpio03",
-	"gpio04",
-	"gpio05",
-	"gpio06",
-	"gpio07",
-	"gpio08",
-	"gpio09",
-	"gpio10",
-	"gpio11",
-	"gpio12",
-	"gpio13",
-	"gpio14",
-	"gps_pablank",
-	"gps_tmark",
-	"hdmi_scl",
-	"hdmi_sda",
-	"ic_dm",
-	"ic_dp",
-	"kp_col_ip_0",
-	"kp_col_ip_1",
-	"kp_col_ip_2",
-	"kp_col_ip_3",
-	"kp_row_op_0",
-	"kp_row_op_1",
-	"kp_row_op_2",
-	"kp_row_op_3",
-	"lcd_b_0",
-	"lcd_b_1",
-	"lcd_b_2",
-	"lcd_b_3",
-	"lcd_b_4",
-	"lcd_b_5",
-	"lcd_b_6",
-	"lcd_b_7",
-	"lcd_g_0",
-	"lcd_g_1",
-	"lcd_g_2",
-	"lcd_g_3",
-	"lcd_g_4",
-	"lcd_g_5",
-	"lcd_g_6",
-	"lcd_g_7",
-	"lcd_hsync",
-	"lcd_oe",
-	"lcd_pclk",
-	"lcd_r_0",
-	"lcd_r_1",
-	"lcd_r_2",
-	"lcd_r_3",
-	"lcd_r_4",
-	"lcd_r_5",
-	"lcd_r_6",
-	"lcd_r_7",
-	"lcd_vsync",
-	"mdmgpio0",
-	"mdmgpio1",
-	"mdmgpio2",
-	"mdmgpio3",
-	"mdmgpio4",
-	"mdmgpio5",
-	"mdmgpio6",
-	"mdmgpio7",
-	"mdmgpio8",
-	"mphi_data_0",
-	"mphi_data_1",
-	"mphi_data_2",
-	"mphi_data_3",
-	"mphi_data_4",
-	"mphi_data_5",
-	"mphi_data_6",
-	"mphi_data_7",
-	"mphi_data_8",
-	"mphi_data_9",
-	"mphi_data_10",
-	"mphi_data_11",
-	"mphi_data_12",
-	"mphi_data_13",
-	"mphi_data_14",
-	"mphi_data_15",
-	"mphi_ha0",
-	"mphi_hat0",
-	"mphi_hat1",
-	"mphi_hce0_n",
-	"mphi_hce1_n",
-	"mphi_hrd_n",
-	"mphi_hwr_n",
-	"mphi_run0",
-	"mphi_run1",
-	"mtx_scan_clk",
-	"mtx_scan_data",
-	"nand_ad_0",
-	"nand_ad_1",
-	"nand_ad_2",
-	"nand_ad_3",
-	"nand_ad_4",
-	"nand_ad_5",
-	"nand_ad_6",
-	"nand_ad_7",
-	"nand_ale",
-	"nand_cen_0",
-	"nand_cen_1",
-	"nand_cle",
-	"nand_oen",
-	"nand_rdy_0",
-	"nand_rdy_1",
-	"nand_wen",
-	"nand_wp",
-	"pc1",
-	"pc2",
-	"pmu_int",
-	"pmu_scl",
-	"pmu_sda",
-	"rfst2g_mtsloten3g",
-	"rgmii_0_rx_ctl",
-	"rgmii_0_rxc",
-	"rgmii_0_rxd_0",
-	"rgmii_0_rxd_1",
-	"rgmii_0_rxd_2",
-	"rgmii_0_rxd_3",
-	"rgmii_0_tx_ctl",
-	"rgmii_0_txc",
-	"rgmii_0_txd_0",
-	"rgmii_0_txd_1",
-	"rgmii_0_txd_2",
-	"rgmii_0_txd_3",
-	"rgmii_1_rx_ctl",
-	"rgmii_1_rxc",
-	"rgmii_1_rxd_0",
-	"rgmii_1_rxd_1",
-	"rgmii_1_rxd_2",
-	"rgmii_1_rxd_3",
-	"rgmii_1_tx_ctl",
-	"rgmii_1_txc",
-	"rgmii_1_txd_0",
-	"rgmii_1_txd_1",
-	"rgmii_1_txd_2",
-	"rgmii_1_txd_3",
-	"rgmii_gpio_0",
-	"rgmii_gpio_1",
-	"rgmii_gpio_2",
-	"rgmii_gpio_3",
-	"rtxdata2g_txdata3g1",
-	"rtxen2g_txdata3g2",
-	"rxdata3g0",
-	"rxdata3g1",
-	"rxdata3g2",
-	"sdio1_clk",
-	"sdio1_cmd",
-	"sdio1_data_0",
-	"sdio1_data_1",
-	"sdio1_data_2",
-	"sdio1_data_3",
-	"sdio4_clk",
-	"sdio4_cmd",
-	"sdio4_data_0",
-	"sdio4_data_1",
-	"sdio4_data_2",
-	"sdio4_data_3",
-	"sim_clk",
-	"sim_data",
-	"sim_det",
-	"sim_resetn",
-	"sim2_clk",
-	"sim2_data",
-	"sim2_det",
-	"sim2_resetn",
-	"sri_c",
-	"sri_d",
-	"sri_e",
-	"ssp_extclk",
-	"ssp0_clk",
-	"ssp0_fs",
-	"ssp0_rxd",
-	"ssp0_txd",
-	"ssp2_clk",
-	"ssp2_fs_0",
-	"ssp2_fs_1",
-	"ssp2_fs_2",
-	"ssp2_fs_3",
-	"ssp2_rxd_0",
-	"ssp2_rxd_1",
-	"ssp2_txd_0",
-	"ssp2_txd_1",
-	"ssp3_clk",
-	"ssp3_fs",
-	"ssp3_rxd",
-	"ssp3_txd",
-	"ssp4_clk",
-	"ssp4_fs",
-	"ssp4_rxd",
-	"ssp4_txd",
-	"ssp5_clk",
-	"ssp5_fs",
-	"ssp5_rxd",
-	"ssp5_txd",
-	"ssp6_clk",
-	"ssp6_fs",
-	"ssp6_rxd",
-	"ssp6_txd",
-	"stat_1",
-	"stat_2",
-	"sysclken",
-	"traceclk",
-	"tracedt00",
-	"tracedt01",
-	"tracedt02",
-	"tracedt03",
-	"tracedt04",
-	"tracedt05",
-	"tracedt06",
-	"tracedt07",
-	"tracedt08",
-	"tracedt09",
-	"tracedt10",
-	"tracedt11",
-	"tracedt12",
-	"tracedt13",
-	"tracedt14",
-	"tracedt15",
-	"txdata3g0",
-	"txpwrind",
-	"uartb1_ucts",
-	"uartb1_urts",
-	"uartb1_urxd",
-	"uartb1_utxd",
-	"uartb2_urxd",
-	"uartb2_utxd",
-	"uartb3_ucts",
-	"uartb3_urts",
-	"uartb3_urxd",
-	"uartb3_utxd",
-	"uartb4_ucts",
-	"uartb4_urts",
-	"uartb4_urxd",
-	"uartb4_utxd",
-	"vc_cam1_scl",
-	"vc_cam1_sda",
-	"vc_cam2_scl",
-	"vc_cam2_sda",
-	"vc_cam3_scl",
-	"vc_cam3_sda",
-};
-
-/* Every pin can implement all ALT1-ALT4 functions */
-#define BCM281XX_PIN_FUNCTION(fcn_name)			\
-{							\
-	.name = #fcn_name,				\
-	.groups = bcm281xx_alt_groups,			\
-	.ngroups = ARRAY_SIZE(bcm281xx_alt_groups),	\
-}
-
-static const struct bcm281xx_pin_function bcm281xx_functions[] = {
-	BCM281XX_PIN_FUNCTION(alt1),
-	BCM281XX_PIN_FUNCTION(alt2),
-	BCM281XX_PIN_FUNCTION(alt3),
-	BCM281XX_PIN_FUNCTION(alt4),
-};
-
-static struct bcm281xx_pinctrl_data bcm281xx_pinctrl = {
-	.pins = bcm281xx_pinctrl_pins,
-	.npins = ARRAY_SIZE(bcm281xx_pinctrl_pins),
-	.functions = bcm281xx_functions,
-	.nfunctions = ARRAY_SIZE(bcm281xx_functions),
-};
-
-static inline enum bcm281xx_pin_type pin_type_get(struct pinctrl_dev *pctldev,
-						  unsigned pin)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-
-	if (pin >= pdata->npins)
-		return BCM281XX_PIN_TYPE_UNKNOWN;
-
-	return *(enum bcm281xx_pin_type *)(pdata->pins[pin].drv_data);
-}
-
-#define BCM281XX_PIN_SHIFT(type, param) \
-	(BCM281XX_ ## type ## _PIN_REG_ ## param ## _SHIFT)
-
-#define BCM281XX_PIN_MASK(type, param) \
-	(BCM281XX_ ## type ## _PIN_REG_ ## param ## _MASK)
-
-/*
- * This helper function is used to build up the value and mask used to write to
- * a pin register, but does not actually write to the register.
- */
-static inline void bcm281xx_pin_update(u32 *reg_val, u32 *reg_mask,
-				       u32 param_val, u32 param_shift,
-				       u32 param_mask)
-{
-	*reg_val &= ~param_mask;
-	*reg_val |= (param_val << param_shift) & param_mask;
-	*reg_mask |= param_mask;
-}
-
-static struct regmap_config bcm281xx_pinctrl_regmap_config = {
-	.reg_bits = 32,
-	.reg_stride = 4,
-	.val_bits = 32,
-	.max_register = BCM281XX_PIN_VC_CAM3_SDA,
-};
-
-static int bcm281xx_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-
-	return pdata->npins;
-}
-
-static const char *bcm281xx_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
-						   unsigned group)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-
-	return pdata->pins[group].name;
-}
-
-static int bcm281xx_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
-					   unsigned group,
-					   const unsigned **pins,
-					   unsigned *num_pins)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-
-	*pins = &pdata->pins[group].number;
-	*num_pins = 1;
-
-	return 0;
-}
-
-static void bcm281xx_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
-					  struct seq_file *s,
-					  unsigned offset)
-{
-	seq_printf(s, " %s", dev_name(pctldev->dev));
-}
-
-static struct pinctrl_ops bcm281xx_pinctrl_ops = {
-	.get_groups_count = bcm281xx_pinctrl_get_groups_count,
-	.get_group_name = bcm281xx_pinctrl_get_group_name,
-	.get_group_pins = bcm281xx_pinctrl_get_group_pins,
-	.pin_dbg_show = bcm281xx_pinctrl_pin_dbg_show,
-	.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
-	.dt_free_map = pinctrl_utils_dt_free_map,
-};
-
-static int bcm281xx_pinctrl_get_fcns_count(struct pinctrl_dev *pctldev)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-
-	return pdata->nfunctions;
-}
-
-static const char *bcm281xx_pinctrl_get_fcn_name(struct pinctrl_dev *pctldev,
-						 unsigned function)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-
-	return pdata->functions[function].name;
-}
-
-static int bcm281xx_pinctrl_get_fcn_groups(struct pinctrl_dev *pctldev,
-					   unsigned function,
-					   const char * const **groups,
-					   unsigned * const num_groups)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-
-	*groups = pdata->functions[function].groups;
-	*num_groups = pdata->functions[function].ngroups;
-
-	return 0;
-}
-
-static int bcm281xx_pinmux_set(struct pinctrl_dev *pctldev,
-			       unsigned function,
-			       unsigned group)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-	const struct bcm281xx_pin_function *f = &pdata->functions[function];
-	u32 offset = 4 * pdata->pins[group].number;
-	int rc = 0;
-
-	dev_dbg(pctldev->dev,
-		"%s(): Enable function %s (%d) of pin %s (%d) @offset 0x%x.\n",
-		__func__, f->name, function, pdata->pins[group].name,
-		pdata->pins[group].number, offset);
-
-	rc = regmap_update_bits(pdata->regmap, offset,
-		BCM281XX_PIN_REG_F_SEL_MASK,
-		function << BCM281XX_PIN_REG_F_SEL_SHIFT);
-	if (rc)
-		dev_err(pctldev->dev,
-			"Error updating register for pin %s (%d).\n",
-			pdata->pins[group].name, pdata->pins[group].number);
-
-	return rc;
-}
-
-static struct pinmux_ops bcm281xx_pinctrl_pinmux_ops = {
-	.get_functions_count = bcm281xx_pinctrl_get_fcns_count,
-	.get_function_name = bcm281xx_pinctrl_get_fcn_name,
-	.get_function_groups = bcm281xx_pinctrl_get_fcn_groups,
-	.set_mux = bcm281xx_pinmux_set,
-};
-
-static int bcm281xx_pinctrl_pin_config_get(struct pinctrl_dev *pctldev,
-					   unsigned pin,
-					   unsigned long *config)
-{
-	return -ENOTSUPP;
-}
-
-
-/* Goes through the configs and update register val/mask */
-static int bcm281xx_std_pin_update(struct pinctrl_dev *pctldev,
-				   unsigned pin,
-				   unsigned long *configs,
-				   unsigned num_configs,
-				   u32 *val,
-				   u32 *mask)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-	int i;
-	enum pin_config_param param;
-	u16 arg;
-
-	for (i = 0; i < num_configs; i++) {
-		param = pinconf_to_config_param(configs[i]);
-		arg = pinconf_to_config_argument(configs[i]);
-
-		switch (param) {
-		case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
-			arg = (arg >= 1 ? 1 : 0);
-			bcm281xx_pin_update(val, mask, arg,
-				BCM281XX_PIN_SHIFT(STD, HYST),
-				BCM281XX_PIN_MASK(STD, HYST));
-			break;
-		/*
-		 * The pin bias can only be one of pull-up, pull-down, or
-		 * disable.  The user does not need to specify a value for the
-		 * property, and the default value from pinconf-generic is
-		 * ignored.
-		 */
-		case PIN_CONFIG_BIAS_DISABLE:
-			bcm281xx_pin_update(val, mask, 0,
-				BCM281XX_PIN_SHIFT(STD, PULL_UP),
-				BCM281XX_PIN_MASK(STD, PULL_UP));
-			bcm281xx_pin_update(val, mask, 0,
-				BCM281XX_PIN_SHIFT(STD, PULL_DN),
-				BCM281XX_PIN_MASK(STD, PULL_DN));
-			break;
-
-		case PIN_CONFIG_BIAS_PULL_UP:
-			bcm281xx_pin_update(val, mask, 1,
-				BCM281XX_PIN_SHIFT(STD, PULL_UP),
-				BCM281XX_PIN_MASK(STD, PULL_UP));
-			bcm281xx_pin_update(val, mask, 0,
-				BCM281XX_PIN_SHIFT(STD, PULL_DN),
-				BCM281XX_PIN_MASK(STD, PULL_DN));
-			break;
-
-		case PIN_CONFIG_BIAS_PULL_DOWN:
-			bcm281xx_pin_update(val, mask, 0,
-				BCM281XX_PIN_SHIFT(STD, PULL_UP),
-				BCM281XX_PIN_MASK(STD, PULL_UP));
-			bcm281xx_pin_update(val, mask, 1,
-				BCM281XX_PIN_SHIFT(STD, PULL_DN),
-				BCM281XX_PIN_MASK(STD, PULL_DN));
-			break;
-
-		case PIN_CONFIG_SLEW_RATE:
-			arg = (arg >= 1 ? 1 : 0);
-			bcm281xx_pin_update(val, mask, arg,
-				BCM281XX_PIN_SHIFT(STD, SLEW),
-				BCM281XX_PIN_MASK(STD, SLEW));
-			break;
-
-		case PIN_CONFIG_INPUT_ENABLE:
-			/* inversed since register is for input _disable_ */
-			arg = (arg >= 1 ? 0 : 1);
-			bcm281xx_pin_update(val, mask, arg,
-				BCM281XX_PIN_SHIFT(STD, INPUT_DIS),
-				BCM281XX_PIN_MASK(STD, INPUT_DIS));
-			break;
-
-		case PIN_CONFIG_DRIVE_STRENGTH:
-			/* Valid range is 2-16 mA, even numbers only */
-			if ((arg < 2) || (arg > 16) || (arg % 2)) {
-				dev_err(pctldev->dev,
-					"Invalid Drive Strength value (%d) for "
-					"pin %s (%d). Valid values are "
-					"(2..16) mA, even numbers only.\n",
-					arg, pdata->pins[pin].name, pin);
-				return -EINVAL;
-			}
-			bcm281xx_pin_update(val, mask, (arg/2)-1,
-				BCM281XX_PIN_SHIFT(STD, DRV_STR),
-				BCM281XX_PIN_MASK(STD, DRV_STR));
-			break;
-
-		default:
-			dev_err(pctldev->dev,
-				"Unrecognized pin config %d for pin %s (%d).\n",
-				param, pdata->pins[pin].name, pin);
-			return -EINVAL;
-
-		} /* switch config */
-	} /* for each config */
-
-	return 0;
-}
-
-/*
- * The pull-up strength for an I2C pin is represented by bits 4-6 in the
- * register with the following mapping:
- *   0b000: No pull-up
- *   0b001: 1200 Ohm
- *   0b010: 1800 Ohm
- *   0b011: 720 Ohm
- *   0b100: 2700 Ohm
- *   0b101: 831 Ohm
- *   0b110: 1080 Ohm
- *   0b111: 568 Ohm
- * This array maps pull-up strength in Ohms to register values (1+index).
- */
-static const u16 bcm281xx_pullup_map[] = {
-	1200, 1800, 720, 2700, 831, 1080, 568
-};
-
-/* Goes through the configs and update register val/mask */
-static int bcm281xx_i2c_pin_update(struct pinctrl_dev *pctldev,
-				   unsigned pin,
-				   unsigned long *configs,
-				   unsigned num_configs,
-				   u32 *val,
-				   u32 *mask)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-	int i, j;
-	enum pin_config_param param;
-	u16 arg;
-
-	for (i = 0; i < num_configs; i++) {
-		param = pinconf_to_config_param(configs[i]);
-		arg = pinconf_to_config_argument(configs[i]);
-
-		switch (param) {
-		case PIN_CONFIG_BIAS_PULL_UP:
-			for (j = 0; j < ARRAY_SIZE(bcm281xx_pullup_map); j++)
-				if (bcm281xx_pullup_map[j] == arg)
-					break;
-
-			if (j == ARRAY_SIZE(bcm281xx_pullup_map)) {
-				dev_err(pctldev->dev,
-					"Invalid pull-up value (%d) for pin %s "
-					"(%d). Valid values are 568, 720, 831, "
-					"1080, 1200, 1800, 2700 Ohms.\n",
-					arg, pdata->pins[pin].name, pin);
-				return -EINVAL;
-			}
-
-			bcm281xx_pin_update(val, mask, j+1,
-				BCM281XX_PIN_SHIFT(I2C, PULL_UP_STR),
-				BCM281XX_PIN_MASK(I2C, PULL_UP_STR));
-			break;
-
-		case PIN_CONFIG_BIAS_DISABLE:
-			bcm281xx_pin_update(val, mask, 0,
-				BCM281XX_PIN_SHIFT(I2C, PULL_UP_STR),
-				BCM281XX_PIN_MASK(I2C, PULL_UP_STR));
-			break;
-
-		case PIN_CONFIG_SLEW_RATE:
-			arg = (arg >= 1 ? 1 : 0);
-			bcm281xx_pin_update(val, mask, arg,
-				BCM281XX_PIN_SHIFT(I2C, SLEW),
-				BCM281XX_PIN_MASK(I2C, SLEW));
-			break;
-
-		case PIN_CONFIG_INPUT_ENABLE:
-			/* inversed since register is for input _disable_ */
-			arg = (arg >= 1 ? 0 : 1);
-			bcm281xx_pin_update(val, mask, arg,
-				BCM281XX_PIN_SHIFT(I2C, INPUT_DIS),
-				BCM281XX_PIN_MASK(I2C, INPUT_DIS));
-			break;
-
-		default:
-			dev_err(pctldev->dev,
-				"Unrecognized pin config %d for pin %s (%d).\n",
-				param, pdata->pins[pin].name, pin);
-			return -EINVAL;
-
-		} /* switch config */
-	} /* for each config */
-
-	return 0;
-}
-
-/* Goes through the configs and update register val/mask */
-static int bcm281xx_hdmi_pin_update(struct pinctrl_dev *pctldev,
-				    unsigned pin,
-				    unsigned long *configs,
-				    unsigned num_configs,
-				    u32 *val,
-				    u32 *mask)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-	int i;
-	enum pin_config_param param;
-	u16 arg;
-
-	for (i = 0; i < num_configs; i++) {
-		param = pinconf_to_config_param(configs[i]);
-		arg = pinconf_to_config_argument(configs[i]);
-
-		switch (param) {
-		case PIN_CONFIG_SLEW_RATE:
-			arg = (arg >= 1 ? 1 : 0);
-			bcm281xx_pin_update(val, mask, arg,
-				BCM281XX_PIN_SHIFT(HDMI, MODE),
-				BCM281XX_PIN_MASK(HDMI, MODE));
-			break;
-
-		case PIN_CONFIG_INPUT_ENABLE:
-			/* inversed since register is for input _disable_ */
-			arg = (arg >= 1 ? 0 : 1);
-			bcm281xx_pin_update(val, mask, arg,
-				BCM281XX_PIN_SHIFT(HDMI, INPUT_DIS),
-				BCM281XX_PIN_MASK(HDMI, INPUT_DIS));
-			break;
-
-		default:
-			dev_err(pctldev->dev,
-				"Unrecognized pin config %d for pin %s (%d).\n",
-				param, pdata->pins[pin].name, pin);
-			return -EINVAL;
-
-		} /* switch config */
-	} /* for each config */
-
-	return 0;
-}
-
-static int bcm281xx_pinctrl_pin_config_set(struct pinctrl_dev *pctldev,
-					   unsigned pin,
-					   unsigned long *configs,
-					   unsigned num_configs)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-	enum bcm281xx_pin_type pin_type;
-	u32 offset = 4 * pin;
-	u32 cfg_val, cfg_mask;
-	int rc;
-
-	cfg_val = 0;
-	cfg_mask = 0;
-	pin_type = pin_type_get(pctldev, pin);
-
-	/* Different pins have different configuration options */
-	switch (pin_type) {
-	case BCM281XX_PIN_TYPE_STD:
-		rc = bcm281xx_std_pin_update(pctldev, pin, configs,
-			num_configs, &cfg_val, &cfg_mask);
-		break;
-
-	case BCM281XX_PIN_TYPE_I2C:
-		rc = bcm281xx_i2c_pin_update(pctldev, pin, configs,
-			num_configs, &cfg_val, &cfg_mask);
-		break;
-
-	case BCM281XX_PIN_TYPE_HDMI:
-		rc = bcm281xx_hdmi_pin_update(pctldev, pin, configs,
-			num_configs, &cfg_val, &cfg_mask);
-		break;
-
-	default:
-		dev_err(pctldev->dev, "Unknown pin type for pin %s (%d).\n",
-			pdata->pins[pin].name, pin);
-		return -EINVAL;
-
-	} /* switch pin type */
-
-	if (rc)
-		return rc;
-
-	dev_dbg(pctldev->dev,
-		"%s(): Set pin %s (%d) with config 0x%x, mask 0x%x\n",
-		__func__, pdata->pins[pin].name, pin, cfg_val, cfg_mask);
-
-	rc = regmap_update_bits(pdata->regmap, offset, cfg_mask, cfg_val);
-	if (rc) {
-		dev_err(pctldev->dev,
-			"Error updating register for pin %s (%d).\n",
-			pdata->pins[pin].name, pin);
-		return rc;
-	}
-
-	return 0;
-}
-
-static struct pinconf_ops bcm281xx_pinctrl_pinconf_ops = {
-	.pin_config_get = bcm281xx_pinctrl_pin_config_get,
-	.pin_config_set = bcm281xx_pinctrl_pin_config_set,
-};
-
-static struct pinctrl_desc bcm281xx_pinctrl_desc = {
-	/* name, pins, npins members initialized in probe function */
-	.pctlops = &bcm281xx_pinctrl_ops,
-	.pmxops = &bcm281xx_pinctrl_pinmux_ops,
-	.confops = &bcm281xx_pinctrl_pinconf_ops,
-	.owner = THIS_MODULE,
-};
-
-static int __init bcm281xx_pinctrl_probe(struct platform_device *pdev)
-{
-	struct bcm281xx_pinctrl_data *pdata = &bcm281xx_pinctrl;
-	struct resource *res;
-	struct pinctrl_dev *pctl;
-
-	/* So far We can assume there is only 1 bank of registers */
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	pdata->reg_base = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(pdata->reg_base)) {
-		dev_err(&pdev->dev, "Failed to ioremap MEM resource\n");
-		return -ENODEV;
-	}
-
-	/* Initialize the dynamic part of pinctrl_desc */
-	pdata->regmap = devm_regmap_init_mmio(&pdev->dev, pdata->reg_base,
-		&bcm281xx_pinctrl_regmap_config);
-	if (IS_ERR(pdata->regmap)) {
-		dev_err(&pdev->dev, "Regmap MMIO init failed.\n");
-		return -ENODEV;
-	}
-
-	bcm281xx_pinctrl_desc.name = dev_name(&pdev->dev);
-	bcm281xx_pinctrl_desc.pins = bcm281xx_pinctrl.pins;
-	bcm281xx_pinctrl_desc.npins = bcm281xx_pinctrl.npins;
-
-	pctl = pinctrl_register(&bcm281xx_pinctrl_desc,
-				&pdev->dev,
-				pdata);
-	if (!pctl) {
-		dev_err(&pdev->dev, "Failed to register pinctrl\n");
-		return -ENODEV;
-	}
-
-	platform_set_drvdata(pdev, pdata);
-
-	return 0;
-}
-
-static struct of_device_id bcm281xx_pinctrl_of_match[] = {
-	{ .compatible = "brcm,bcm11351-pinctrl", },
-	{ },
-};
-
-static struct platform_driver bcm281xx_pinctrl_driver = {
-	.driver = {
-		.name = "bcm281xx-pinctrl",
-		.of_match_table = bcm281xx_pinctrl_of_match,
-	},
-};
-
-module_platform_driver_probe(bcm281xx_pinctrl_driver, bcm281xx_pinctrl_probe);
-
-MODULE_AUTHOR("Broadcom Corporation <bcm-kernel-feedback-list@broadcom.com>");
-MODULE_AUTHOR("Sherman Yin <syin@broadcom.com>");
-MODULE_DESCRIPTION("Broadcom BCM281xx pinctrl driver");
-MODULE_LICENSE("GPL v2");
diff --git a/drivers/pinctrl/pinctrl-bcm2835.c b/drivers/pinctrl/pinctrl-bcm2835.c
deleted file mode 100644
index 9aa8a3f..0000000
--- a/drivers/pinctrl/pinctrl-bcm2835.c
+++ /dev/null
@@ -1,1072 +0,0 @@
-/*
- * Driver for Broadcom BCM2835 GPIO unit (pinctrl + GPIO)
- *
- * Copyright (C) 2012 Chris Boot, Simon Arlott, Stephen Warren
- *
- * This driver is inspired by:
- * pinctrl-nomadik.c, please see original file for copyright information
- * pinctrl-tegra.c, please see original file for copyright information
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
-
-#include <linux/bitmap.h>
-#include <linux/bug.h>
-#include <linux/delay.h>
-#include <linux/device.h>
-#include <linux/err.h>
-#include <linux/gpio.h>
-#include <linux/interrupt.h>
-#include <linux/io.h>
-#include <linux/irq.h>
-#include <linux/irqdesc.h>
-#include <linux/irqdomain.h>
-#include <linux/module.h>
-#include <linux/of_address.h>
-#include <linux/of.h>
-#include <linux/of_irq.h>
-#include <linux/pinctrl/consumer.h>
-#include <linux/pinctrl/machine.h>
-#include <linux/pinctrl/pinconf.h>
-#include <linux/pinctrl/pinctrl.h>
-#include <linux/pinctrl/pinmux.h>
-#include <linux/platform_device.h>
-#include <linux/seq_file.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
-#include <linux/types.h>
-
-#define MODULE_NAME "pinctrl-bcm2835"
-#define BCM2835_NUM_GPIOS 54
-#define BCM2835_NUM_BANKS 2
-
-#define BCM2835_PIN_BITMAP_SZ \
-	DIV_ROUND_UP(BCM2835_NUM_GPIOS, sizeof(unsigned long) * 8)
-
-/* GPIO register offsets */
-#define GPFSEL0		0x0	/* Function Select */
-#define GPSET0		0x1c	/* Pin Output Set */
-#define GPCLR0		0x28	/* Pin Output Clear */
-#define GPLEV0		0x34	/* Pin Level */
-#define GPEDS0		0x40	/* Pin Event Detect Status */
-#define GPREN0		0x4c	/* Pin Rising Edge Detect Enable */
-#define GPFEN0		0x58	/* Pin Falling Edge Detect Enable */
-#define GPHEN0		0x64	/* Pin High Detect Enable */
-#define GPLEN0		0x70	/* Pin Low Detect Enable */
-#define GPAREN0		0x7c	/* Pin Async Rising Edge Detect */
-#define GPAFEN0		0x88	/* Pin Async Falling Edge Detect */
-#define GPPUD		0x94	/* Pin Pull-up/down Enable */
-#define GPPUDCLK0	0x98	/* Pin Pull-up/down Enable Clock */
-
-#define FSEL_REG(p)		(GPFSEL0 + (((p) / 10) * 4))
-#define FSEL_SHIFT(p)		(((p) % 10) * 3)
-#define GPIO_REG_OFFSET(p)	((p) / 32)
-#define GPIO_REG_SHIFT(p)	((p) % 32)
-
-enum bcm2835_pinconf_param {
-	/* argument: bcm2835_pinconf_pull */
-	BCM2835_PINCONF_PARAM_PULL,
-};
-
-enum bcm2835_pinconf_pull {
-	BCM2835_PINCONFIG_PULL_NONE,
-	BCM2835_PINCONFIG_PULL_DOWN,
-	BCM2835_PINCONFIG_PULL_UP,
-};
-
-#define BCM2835_PINCONF_PACK(_param_, _arg_) ((_param_) << 16 | (_arg_))
-#define BCM2835_PINCONF_UNPACK_PARAM(_conf_) ((_conf_) >> 16)
-#define BCM2835_PINCONF_UNPACK_ARG(_conf_) ((_conf_) & 0xffff)
-
-struct bcm2835_gpio_irqdata {
-	struct bcm2835_pinctrl *pc;
-	int bank;
-};
-
-struct bcm2835_pinctrl {
-	struct device *dev;
-	void __iomem *base;
-	int irq[BCM2835_NUM_BANKS];
-
-	/* note: locking assumes each bank will have its own unsigned long */
-	unsigned long enabled_irq_map[BCM2835_NUM_BANKS];
-	unsigned int irq_type[BCM2835_NUM_GPIOS];
-
-	struct pinctrl_dev *pctl_dev;
-	struct irq_domain *irq_domain;
-	struct gpio_chip gpio_chip;
-	struct pinctrl_gpio_range gpio_range;
-
-	struct bcm2835_gpio_irqdata irq_data[BCM2835_NUM_BANKS];
-	spinlock_t irq_lock[BCM2835_NUM_BANKS];
-};
-
-static struct lock_class_key gpio_lock_class;
-
-/* pins are just named GPIO0..GPIO53 */
-#define BCM2835_GPIO_PIN(a) PINCTRL_PIN(a, "gpio" #a)
-static struct pinctrl_pin_desc bcm2835_gpio_pins[] = {
-	BCM2835_GPIO_PIN(0),
-	BCM2835_GPIO_PIN(1),
-	BCM2835_GPIO_PIN(2),
-	BCM2835_GPIO_PIN(3),
-	BCM2835_GPIO_PIN(4),
-	BCM2835_GPIO_PIN(5),
-	BCM2835_GPIO_PIN(6),
-	BCM2835_GPIO_PIN(7),
-	BCM2835_GPIO_PIN(8),
-	BCM2835_GPIO_PIN(9),
-	BCM2835_GPIO_PIN(10),
-	BCM2835_GPIO_PIN(11),
-	BCM2835_GPIO_PIN(12),
-	BCM2835_GPIO_PIN(13),
-	BCM2835_GPIO_PIN(14),
-	BCM2835_GPIO_PIN(15),
-	BCM2835_GPIO_PIN(16),
-	BCM2835_GPIO_PIN(17),
-	BCM2835_GPIO_PIN(18),
-	BCM2835_GPIO_PIN(19),
-	BCM2835_GPIO_PIN(20),
-	BCM2835_GPIO_PIN(21),
-	BCM2835_GPIO_PIN(22),
-	BCM2835_GPIO_PIN(23),
-	BCM2835_GPIO_PIN(24),
-	BCM2835_GPIO_PIN(25),
-	BCM2835_GPIO_PIN(26),
-	BCM2835_GPIO_PIN(27),
-	BCM2835_GPIO_PIN(28),
-	BCM2835_GPIO_PIN(29),
-	BCM2835_GPIO_PIN(30),
-	BCM2835_GPIO_PIN(31),
-	BCM2835_GPIO_PIN(32),
-	BCM2835_GPIO_PIN(33),
-	BCM2835_GPIO_PIN(34),
-	BCM2835_GPIO_PIN(35),
-	BCM2835_GPIO_PIN(36),
-	BCM2835_GPIO_PIN(37),
-	BCM2835_GPIO_PIN(38),
-	BCM2835_GPIO_PIN(39),
-	BCM2835_GPIO_PIN(40),
-	BCM2835_GPIO_PIN(41),
-	BCM2835_GPIO_PIN(42),
-	BCM2835_GPIO_PIN(43),
-	BCM2835_GPIO_PIN(44),
-	BCM2835_GPIO_PIN(45),
-	BCM2835_GPIO_PIN(46),
-	BCM2835_GPIO_PIN(47),
-	BCM2835_GPIO_PIN(48),
-	BCM2835_GPIO_PIN(49),
-	BCM2835_GPIO_PIN(50),
-	BCM2835_GPIO_PIN(51),
-	BCM2835_GPIO_PIN(52),
-	BCM2835_GPIO_PIN(53),
-};
-
-/* one pin per group */
-static const char * const bcm2835_gpio_groups[] = {
-	"gpio0",
-	"gpio1",
-	"gpio2",
-	"gpio3",
-	"gpio4",
-	"gpio5",
-	"gpio6",
-	"gpio7",
-	"gpio8",
-	"gpio9",
-	"gpio10",
-	"gpio11",
-	"gpio12",
-	"gpio13",
-	"gpio14",
-	"gpio15",
-	"gpio16",
-	"gpio17",
-	"gpio18",
-	"gpio19",
-	"gpio20",
-	"gpio21",
-	"gpio22",
-	"gpio23",
-	"gpio24",
-	"gpio25",
-	"gpio26",
-	"gpio27",
-	"gpio28",
-	"gpio29",
-	"gpio30",
-	"gpio31",
-	"gpio32",
-	"gpio33",
-	"gpio34",
-	"gpio35",
-	"gpio36",
-	"gpio37",
-	"gpio38",
-	"gpio39",
-	"gpio40",
-	"gpio41",
-	"gpio42",
-	"gpio43",
-	"gpio44",
-	"gpio45",
-	"gpio46",
-	"gpio47",
-	"gpio48",
-	"gpio49",
-	"gpio50",
-	"gpio51",
-	"gpio52",
-	"gpio53",
-};
-
-enum bcm2835_fsel {
-	BCM2835_FSEL_GPIO_IN = 0,
-	BCM2835_FSEL_GPIO_OUT = 1,
-	BCM2835_FSEL_ALT0 = 4,
-	BCM2835_FSEL_ALT1 = 5,
-	BCM2835_FSEL_ALT2 = 6,
-	BCM2835_FSEL_ALT3 = 7,
-	BCM2835_FSEL_ALT4 = 3,
-	BCM2835_FSEL_ALT5 = 2,
-	BCM2835_FSEL_COUNT = 8,
-	BCM2835_FSEL_MASK = 0x7,
-};
-
-static const char * const bcm2835_functions[BCM2835_FSEL_COUNT] = {
-	[BCM2835_FSEL_GPIO_IN] = "gpio_in",
-	[BCM2835_FSEL_GPIO_OUT] = "gpio_out",
-	[BCM2835_FSEL_ALT0] = "alt0",
-	[BCM2835_FSEL_ALT1] = "alt1",
-	[BCM2835_FSEL_ALT2] = "alt2",
-	[BCM2835_FSEL_ALT3] = "alt3",
-	[BCM2835_FSEL_ALT4] = "alt4",
-	[BCM2835_FSEL_ALT5] = "alt5",
-};
-
-static const char * const irq_type_names[] = {
-	[IRQ_TYPE_NONE] = "none",
-	[IRQ_TYPE_EDGE_RISING] = "edge-rising",
-	[IRQ_TYPE_EDGE_FALLING] = "edge-falling",
-	[IRQ_TYPE_EDGE_BOTH] = "edge-both",
-	[IRQ_TYPE_LEVEL_HIGH] = "level-high",
-	[IRQ_TYPE_LEVEL_LOW] = "level-low",
-};
-
-static inline u32 bcm2835_gpio_rd(struct bcm2835_pinctrl *pc, unsigned reg)
-{
-	return readl(pc->base + reg);
-}
-
-static inline void bcm2835_gpio_wr(struct bcm2835_pinctrl *pc, unsigned reg,
-		u32 val)
-{
-	writel(val, pc->base + reg);
-}
-
-static inline int bcm2835_gpio_get_bit(struct bcm2835_pinctrl *pc, unsigned reg,
-		unsigned bit)
-{
-	reg += GPIO_REG_OFFSET(bit) * 4;
-	return (bcm2835_gpio_rd(pc, reg) >> GPIO_REG_SHIFT(bit)) & 1;
-}
-
-/* note NOT a read/modify/write cycle */
-static inline void bcm2835_gpio_set_bit(struct bcm2835_pinctrl *pc,
-		unsigned reg, unsigned bit)
-{
-	reg += GPIO_REG_OFFSET(bit) * 4;
-	bcm2835_gpio_wr(pc, reg, BIT(GPIO_REG_SHIFT(bit)));
-}
-
-static inline enum bcm2835_fsel bcm2835_pinctrl_fsel_get(
-		struct bcm2835_pinctrl *pc, unsigned pin)
-{
-	u32 val = bcm2835_gpio_rd(pc, FSEL_REG(pin));
-	enum bcm2835_fsel status = (val >> FSEL_SHIFT(pin)) & BCM2835_FSEL_MASK;
-
-	dev_dbg(pc->dev, "get %08x (%u => %s)\n", val, pin,
-			bcm2835_functions[status]);
-
-	return status;
-}
-
-static inline void bcm2835_pinctrl_fsel_set(
-		struct bcm2835_pinctrl *pc, unsigned pin,
-		enum bcm2835_fsel fsel)
-{
-	u32 val = bcm2835_gpio_rd(pc, FSEL_REG(pin));
-	enum bcm2835_fsel cur = (val >> FSEL_SHIFT(pin)) & BCM2835_FSEL_MASK;
-
-	dev_dbg(pc->dev, "read %08x (%u => %s)\n", val, pin,
-			bcm2835_functions[cur]);
-
-	if (cur == fsel)
-		return;
-
-	if (cur != BCM2835_FSEL_GPIO_IN && fsel != BCM2835_FSEL_GPIO_IN) {
-		/* always transition through GPIO_IN */
-		val &= ~(BCM2835_FSEL_MASK << FSEL_SHIFT(pin));
-		val |= BCM2835_FSEL_GPIO_IN << FSEL_SHIFT(pin);
-
-		dev_dbg(pc->dev, "trans %08x (%u <= %s)\n", val, pin,
-				bcm2835_functions[BCM2835_FSEL_GPIO_IN]);
-		bcm2835_gpio_wr(pc, FSEL_REG(pin), val);
-	}
-
-	val &= ~(BCM2835_FSEL_MASK << FSEL_SHIFT(pin));
-	val |= fsel << FSEL_SHIFT(pin);
-
-	dev_dbg(pc->dev, "write %08x (%u <= %s)\n", val, pin,
-			bcm2835_functions[fsel]);
-	bcm2835_gpio_wr(pc, FSEL_REG(pin), val);
-}
-
-static int bcm2835_gpio_request(struct gpio_chip *chip, unsigned offset)
-{
-	return pinctrl_request_gpio(chip->base + offset);
-}
-
-static void bcm2835_gpio_free(struct gpio_chip *chip, unsigned offset)
-{
-	pinctrl_free_gpio(chip->base + offset);
-}
-
-static int bcm2835_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
-{
-	return pinctrl_gpio_direction_input(chip->base + offset);
-}
-
-static int bcm2835_gpio_get(struct gpio_chip *chip, unsigned offset)
-{
-	struct bcm2835_pinctrl *pc = dev_get_drvdata(chip->dev);
-
-	return bcm2835_gpio_get_bit(pc, GPLEV0, offset);
-}
-
-static int bcm2835_gpio_direction_output(struct gpio_chip *chip,
-		unsigned offset, int value)
-{
-	return pinctrl_gpio_direction_output(chip->base + offset);
-}
-
-static void bcm2835_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
-{
-	struct bcm2835_pinctrl *pc = dev_get_drvdata(chip->dev);
-
-	bcm2835_gpio_set_bit(pc, value ? GPSET0 : GPCLR0, offset);
-}
-
-static int bcm2835_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
-{
-	struct bcm2835_pinctrl *pc = dev_get_drvdata(chip->dev);
-
-	return irq_linear_revmap(pc->irq_domain, offset);
-}
-
-static struct gpio_chip bcm2835_gpio_chip = {
-	.label = MODULE_NAME,
-	.owner = THIS_MODULE,
-	.request = bcm2835_gpio_request,
-	.free = bcm2835_gpio_free,
-	.direction_input = bcm2835_gpio_direction_input,
-	.direction_output = bcm2835_gpio_direction_output,
-	.get = bcm2835_gpio_get,
-	.set = bcm2835_gpio_set,
-	.to_irq = bcm2835_gpio_to_irq,
-	.base = -1,
-	.ngpio = BCM2835_NUM_GPIOS,
-	.can_sleep = false,
-};
-
-static irqreturn_t bcm2835_gpio_irq_handler(int irq, void *dev_id)
-{
-	struct bcm2835_gpio_irqdata *irqdata = dev_id;
-	struct bcm2835_pinctrl *pc = irqdata->pc;
-	int bank = irqdata->bank;
-	unsigned long events;
-	unsigned offset;
-	unsigned gpio;
-	unsigned int type;
-
-	events = bcm2835_gpio_rd(pc, GPEDS0 + bank * 4);
-	events &= pc->enabled_irq_map[bank];
-	for_each_set_bit(offset, &events, 32) {
-		gpio = (32 * bank) + offset;
-		type = pc->irq_type[gpio];
-
-		/* ack edge triggered IRQs immediately */
-		if (!(type & IRQ_TYPE_LEVEL_MASK))
-			bcm2835_gpio_set_bit(pc, GPEDS0, gpio);
-
-		generic_handle_irq(irq_linear_revmap(pc->irq_domain, gpio));
-
-		/* ack level triggered IRQ after handling them */
-		if (type & IRQ_TYPE_LEVEL_MASK)
-			bcm2835_gpio_set_bit(pc, GPEDS0, gpio);
-	}
-	return events ? IRQ_HANDLED : IRQ_NONE;
-}
-
-static inline void __bcm2835_gpio_irq_config(struct bcm2835_pinctrl *pc,
-	unsigned reg, unsigned offset, bool enable)
-{
-	u32 value;
-	reg += GPIO_REG_OFFSET(offset) * 4;
-	value = bcm2835_gpio_rd(pc, reg);
-	if (enable)
-		value |= BIT(GPIO_REG_SHIFT(offset));
-	else
-		value &= ~(BIT(GPIO_REG_SHIFT(offset)));
-	bcm2835_gpio_wr(pc, reg, value);
-}
-
-/* fast path for IRQ handler */
-static void bcm2835_gpio_irq_config(struct bcm2835_pinctrl *pc,
-	unsigned offset, bool enable)
-{
-	switch (pc->irq_type[offset]) {
-	case IRQ_TYPE_EDGE_RISING:
-		__bcm2835_gpio_irq_config(pc, GPREN0, offset, enable);
-		break;
-
-	case IRQ_TYPE_EDGE_FALLING:
-		__bcm2835_gpio_irq_config(pc, GPFEN0, offset, enable);
-		break;
-
-	case IRQ_TYPE_EDGE_BOTH:
-		__bcm2835_gpio_irq_config(pc, GPREN0, offset, enable);
-		__bcm2835_gpio_irq_config(pc, GPFEN0, offset, enable);
-		break;
-
-	case IRQ_TYPE_LEVEL_HIGH:
-		__bcm2835_gpio_irq_config(pc, GPHEN0, offset, enable);
-		break;
-
-	case IRQ_TYPE_LEVEL_LOW:
-		__bcm2835_gpio_irq_config(pc, GPLEN0, offset, enable);
-		break;
-	}
-}
-
-static void bcm2835_gpio_irq_enable(struct irq_data *data)
-{
-	struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data);
-	unsigned gpio = irqd_to_hwirq(data);
-	unsigned offset = GPIO_REG_SHIFT(gpio);
-	unsigned bank = GPIO_REG_OFFSET(gpio);
-	unsigned long flags;
-
-	spin_lock_irqsave(&pc->irq_lock[bank], flags);
-	set_bit(offset, &pc->enabled_irq_map[bank]);
-	bcm2835_gpio_irq_config(pc, gpio, true);
-	spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
-}
-
-static void bcm2835_gpio_irq_disable(struct irq_data *data)
-{
-	struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data);
-	unsigned gpio = irqd_to_hwirq(data);
-	unsigned offset = GPIO_REG_SHIFT(gpio);
-	unsigned bank = GPIO_REG_OFFSET(gpio);
-	unsigned long flags;
-
-	spin_lock_irqsave(&pc->irq_lock[bank], flags);
-	bcm2835_gpio_irq_config(pc, gpio, false);
-	clear_bit(offset, &pc->enabled_irq_map[bank]);
-	spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
-}
-
-static int __bcm2835_gpio_irq_set_type_disabled(struct bcm2835_pinctrl *pc,
-	unsigned offset, unsigned int type)
-{
-	switch (type) {
-	case IRQ_TYPE_NONE:
-	case IRQ_TYPE_EDGE_RISING:
-	case IRQ_TYPE_EDGE_FALLING:
-	case IRQ_TYPE_EDGE_BOTH:
-	case IRQ_TYPE_LEVEL_HIGH:
-	case IRQ_TYPE_LEVEL_LOW:
-		pc->irq_type[offset] = type;
-		break;
-
-	default:
-		return -EINVAL;
-	}
-	return 0;
-}
-
-/* slower path for reconfiguring IRQ type */
-static int __bcm2835_gpio_irq_set_type_enabled(struct bcm2835_pinctrl *pc,
-	unsigned offset, unsigned int type)
-{
-	switch (type) {
-	case IRQ_TYPE_NONE:
-		if (pc->irq_type[offset] != type) {
-			bcm2835_gpio_irq_config(pc, offset, false);
-			pc->irq_type[offset] = type;
-		}
-		break;
-
-	case IRQ_TYPE_EDGE_RISING:
-		if (pc->irq_type[offset] == IRQ_TYPE_EDGE_BOTH) {
-			/* RISING already enabled, disable FALLING */
-			pc->irq_type[offset] = IRQ_TYPE_EDGE_FALLING;
-			bcm2835_gpio_irq_config(pc, offset, false);
-			pc->irq_type[offset] = type;
-		} else if (pc->irq_type[offset] != type) {
-			bcm2835_gpio_irq_config(pc, offset, false);
-			pc->irq_type[offset] = type;
-			bcm2835_gpio_irq_config(pc, offset, true);
-		}
-		break;
-
-	case IRQ_TYPE_EDGE_FALLING:
-		if (pc->irq_type[offset] == IRQ_TYPE_EDGE_BOTH) {
-			/* FALLING already enabled, disable RISING */
-			pc->irq_type[offset] = IRQ_TYPE_EDGE_RISING;
-			bcm2835_gpio_irq_config(pc, offset, false);
-			pc->irq_type[offset] = type;
-		} else if (pc->irq_type[offset] != type) {
-			bcm2835_gpio_irq_config(pc, offset, false);
-			pc->irq_type[offset] = type;
-			bcm2835_gpio_irq_config(pc, offset, true);
-		}
-		break;
-
-	case IRQ_TYPE_EDGE_BOTH:
-		if (pc->irq_type[offset] == IRQ_TYPE_EDGE_RISING) {
-			/* RISING already enabled, enable FALLING too */
-			pc->irq_type[offset] = IRQ_TYPE_EDGE_FALLING;
-			bcm2835_gpio_irq_config(pc, offset, true);
-			pc->irq_type[offset] = type;
-		} else if (pc->irq_type[offset] == IRQ_TYPE_EDGE_FALLING) {
-			/* FALLING already enabled, enable RISING too */
-			pc->irq_type[offset] = IRQ_TYPE_EDGE_RISING;
-			bcm2835_gpio_irq_config(pc, offset, true);
-			pc->irq_type[offset] = type;
-		} else if (pc->irq_type[offset] != type) {
-			bcm2835_gpio_irq_config(pc, offset, false);
-			pc->irq_type[offset] = type;
-			bcm2835_gpio_irq_config(pc, offset, true);
-		}
-		break;
-
-	case IRQ_TYPE_LEVEL_HIGH:
-	case IRQ_TYPE_LEVEL_LOW:
-		if (pc->irq_type[offset] != type) {
-			bcm2835_gpio_irq_config(pc, offset, false);
-			pc->irq_type[offset] = type;
-			bcm2835_gpio_irq_config(pc, offset, true);
-		}
-		break;
-
-	default:
-		return -EINVAL;
-	}
-	return 0;
-}
-
-static int bcm2835_gpio_irq_set_type(struct irq_data *data, unsigned int type)
-{
-	struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data);
-	unsigned gpio = irqd_to_hwirq(data);
-	unsigned offset = GPIO_REG_SHIFT(gpio);
-	unsigned bank = GPIO_REG_OFFSET(gpio);
-	unsigned long flags;
-	int ret;
-
-	spin_lock_irqsave(&pc->irq_lock[bank], flags);
-
-	if (test_bit(offset, &pc->enabled_irq_map[bank]))
-		ret = __bcm2835_gpio_irq_set_type_enabled(pc, gpio, type);
-	else
-		ret = __bcm2835_gpio_irq_set_type_disabled(pc, gpio, type);
-
-	spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
-
-	return ret;
-}
-
-static struct irq_chip bcm2835_gpio_irq_chip = {
-	.name = MODULE_NAME,
-	.irq_enable = bcm2835_gpio_irq_enable,
-	.irq_disable = bcm2835_gpio_irq_disable,
-	.irq_set_type = bcm2835_gpio_irq_set_type,
-};
-
-static int bcm2835_pctl_get_groups_count(struct pinctrl_dev *pctldev)
-{
-	return ARRAY_SIZE(bcm2835_gpio_groups);
-}
-
-static const char *bcm2835_pctl_get_group_name(struct pinctrl_dev *pctldev,
-		unsigned selector)
-{
-	return bcm2835_gpio_groups[selector];
-}
-
-static int bcm2835_pctl_get_group_pins(struct pinctrl_dev *pctldev,
-		unsigned selector,
-		const unsigned **pins,
-		unsigned *num_pins)
-{
-	*pins = &bcm2835_gpio_pins[selector].number;
-	*num_pins = 1;
-
-	return 0;
-}
-
-static void bcm2835_pctl_pin_dbg_show(struct pinctrl_dev *pctldev,
-		struct seq_file *s,
-		unsigned offset)
-{
-	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
-	enum bcm2835_fsel fsel = bcm2835_pinctrl_fsel_get(pc, offset);
-	const char *fname = bcm2835_functions[fsel];
-	int value = bcm2835_gpio_get_bit(pc, GPLEV0, offset);
-	int irq = irq_find_mapping(pc->irq_domain, offset);
-
-	seq_printf(s, "function %s in %s; irq %d (%s)",
-		fname, value ? "hi" : "lo",
-		irq, irq_type_names[pc->irq_type[offset]]);
-}
-
-static void bcm2835_pctl_dt_free_map(struct pinctrl_dev *pctldev,
-		struct pinctrl_map *maps, unsigned num_maps)
-{
-	int i;
-
-	for (i = 0; i < num_maps; i++)
-		if (maps[i].type == PIN_MAP_TYPE_CONFIGS_PIN)
-			kfree(maps[i].data.configs.configs);
-
-	kfree(maps);
-}
-
-static int bcm2835_pctl_dt_node_to_map_func(struct bcm2835_pinctrl *pc,
-		struct device_node *np, u32 pin, u32 fnum,
-		struct pinctrl_map **maps)
-{
-	struct pinctrl_map *map = *maps;
-
-	if (fnum >= ARRAY_SIZE(bcm2835_functions)) {
-		dev_err(pc->dev, "%s: invalid brcm,function %d\n",
-			of_node_full_name(np), fnum);
-		return -EINVAL;
-	}
-
-	map->type = PIN_MAP_TYPE_MUX_GROUP;
-	map->data.mux.group = bcm2835_gpio_groups[pin];
-	map->data.mux.function = bcm2835_functions[fnum];
-	(*maps)++;
-
-	return 0;
-}
-
-static int bcm2835_pctl_dt_node_to_map_pull(struct bcm2835_pinctrl *pc,
-		struct device_node *np, u32 pin, u32 pull,
-		struct pinctrl_map **maps)
-{
-	struct pinctrl_map *map = *maps;
-	unsigned long *configs;
-
-	if (pull > 2) {
-		dev_err(pc->dev, "%s: invalid brcm,pull %d\n",
-			of_node_full_name(np), pull);
-		return -EINVAL;
-	}
-
-	configs = kzalloc(sizeof(*configs), GFP_KERNEL);
-	if (!configs)
-		return -ENOMEM;
-	configs[0] = BCM2835_PINCONF_PACK(BCM2835_PINCONF_PARAM_PULL, pull);
-
-	map->type = PIN_MAP_TYPE_CONFIGS_PIN;
-	map->data.configs.group_or_pin = bcm2835_gpio_pins[pin].name;
-	map->data.configs.configs = configs;
-	map->data.configs.num_configs = 1;
-	(*maps)++;
-
-	return 0;
-}
-
-static int bcm2835_pctl_dt_node_to_map(struct pinctrl_dev *pctldev,
-		struct device_node *np,
-		struct pinctrl_map **map, unsigned *num_maps)
-{
-	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
-	struct property *pins, *funcs, *pulls;
-	int num_pins, num_funcs, num_pulls, maps_per_pin;
-	struct pinctrl_map *maps, *cur_map;
-	int i, err;
-	u32 pin, func, pull;
-
-	pins = of_find_property(np, "brcm,pins", NULL);
-	if (!pins) {
-		dev_err(pc->dev, "%s: missing brcm,pins property\n",
-				of_node_full_name(np));
-		return -EINVAL;
-	}
-
-	funcs = of_find_property(np, "brcm,function", NULL);
-	pulls = of_find_property(np, "brcm,pull", NULL);
-
-	if (!funcs && !pulls) {
-		dev_err(pc->dev,
-			"%s: neither brcm,function nor brcm,pull specified\n",
-			of_node_full_name(np));
-		return -EINVAL;
-	}
-
-	num_pins = pins->length / 4;
-	num_funcs = funcs ? (funcs->length / 4) : 0;
-	num_pulls = pulls ? (pulls->length / 4) : 0;
-
-	if (num_funcs > 1 && num_funcs != num_pins) {
-		dev_err(pc->dev,
-			"%s: brcm,function must have 1 or %d entries\n",
-			of_node_full_name(np), num_pins);
-		return -EINVAL;
-	}
-
-	if (num_pulls > 1 && num_pulls != num_pins) {
-		dev_err(pc->dev,
-			"%s: brcm,pull must have 1 or %d entries\n",
-			of_node_full_name(np), num_pins);
-		return -EINVAL;
-	}
-
-	maps_per_pin = 0;
-	if (num_funcs)
-		maps_per_pin++;
-	if (num_pulls)
-		maps_per_pin++;
-	cur_map = maps = kzalloc(num_pins * maps_per_pin * sizeof(*maps),
-				GFP_KERNEL);
-	if (!maps)
-		return -ENOMEM;
-
-	for (i = 0; i < num_pins; i++) {
-		err = of_property_read_u32_index(np, "brcm,pins", i, &pin);
-		if (err)
-			goto out;
-		if (pin >= ARRAY_SIZE(bcm2835_gpio_pins)) {
-			dev_err(pc->dev, "%s: invalid brcm,pins value %d\n",
-				of_node_full_name(np), pin);
-			err = -EINVAL;
-			goto out;
-		}
-
-		if (num_funcs) {
-			err = of_property_read_u32_index(np, "brcm,function",
-					(num_funcs > 1) ? i : 0, &func);
-			if (err)
-				goto out;
-			err = bcm2835_pctl_dt_node_to_map_func(pc, np, pin,
-							func, &cur_map);
-			if (err)
-				goto out;
-		}
-		if (num_pulls) {
-			err = of_property_read_u32_index(np, "brcm,pull",
-					(num_funcs > 1) ? i : 0, &pull);
-			if (err)
-				goto out;
-			err = bcm2835_pctl_dt_node_to_map_pull(pc, np, pin,
-							pull, &cur_map);
-			if (err)
-				goto out;
-		}
-	}
-
-	*map = maps;
-	*num_maps = num_pins * maps_per_pin;
-
-	return 0;
-
-out:
-	kfree(maps);
-	return err;
-}
-
-static const struct pinctrl_ops bcm2835_pctl_ops = {
-	.get_groups_count = bcm2835_pctl_get_groups_count,
-	.get_group_name = bcm2835_pctl_get_group_name,
-	.get_group_pins = bcm2835_pctl_get_group_pins,
-	.pin_dbg_show = bcm2835_pctl_pin_dbg_show,
-	.dt_node_to_map = bcm2835_pctl_dt_node_to_map,
-	.dt_free_map = bcm2835_pctl_dt_free_map,
-};
-
-static int bcm2835_pmx_get_functions_count(struct pinctrl_dev *pctldev)
-{
-	return BCM2835_FSEL_COUNT;
-}
-
-static const char *bcm2835_pmx_get_function_name(struct pinctrl_dev *pctldev,
-		unsigned selector)
-{
-	return bcm2835_functions[selector];
-}
-
-static int bcm2835_pmx_get_function_groups(struct pinctrl_dev *pctldev,
-		unsigned selector,
-		const char * const **groups,
-		unsigned * const num_groups)
-{
-	/* every pin can do every function */
-	*groups = bcm2835_gpio_groups;
-	*num_groups = ARRAY_SIZE(bcm2835_gpio_groups);
-
-	return 0;
-}
-
-static int bcm2835_pmx_set(struct pinctrl_dev *pctldev,
-		unsigned func_selector,
-		unsigned group_selector)
-{
-	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
-
-	bcm2835_pinctrl_fsel_set(pc, group_selector, func_selector);
-
-	return 0;
-}
-
-static void bcm2835_pmx_gpio_disable_free(struct pinctrl_dev *pctldev,
-		struct pinctrl_gpio_range *range,
-		unsigned offset)
-{
-	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
-
-	/* disable by setting to GPIO_IN */
-	bcm2835_pinctrl_fsel_set(pc, offset, BCM2835_FSEL_GPIO_IN);
-}
-
-static int bcm2835_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
-		struct pinctrl_gpio_range *range,
-		unsigned offset,
-		bool input)
-{
-	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
-	enum bcm2835_fsel fsel = input ?
-		BCM2835_FSEL_GPIO_IN : BCM2835_FSEL_GPIO_OUT;
-
-	bcm2835_pinctrl_fsel_set(pc, offset, fsel);
-
-	return 0;
-}
-
-static const struct pinmux_ops bcm2835_pmx_ops = {
-	.get_functions_count = bcm2835_pmx_get_functions_count,
-	.get_function_name = bcm2835_pmx_get_function_name,
-	.get_function_groups = bcm2835_pmx_get_function_groups,
-	.set_mux = bcm2835_pmx_set,
-	.gpio_disable_free = bcm2835_pmx_gpio_disable_free,
-	.gpio_set_direction = bcm2835_pmx_gpio_set_direction,
-};
-
-static int bcm2835_pinconf_get(struct pinctrl_dev *pctldev,
-			unsigned pin, unsigned long *config)
-{
-	/* No way to read back config in HW */
-	return -ENOTSUPP;
-}
-
-static int bcm2835_pinconf_set(struct pinctrl_dev *pctldev,
-			unsigned pin, unsigned long *configs,
-			unsigned num_configs)
-{
-	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
-	enum bcm2835_pinconf_param param;
-	u16 arg;
-	u32 off, bit;
-	int i;
-
-	for (i = 0; i < num_configs; i++) {
-		param = BCM2835_PINCONF_UNPACK_PARAM(configs[i]);
-		arg = BCM2835_PINCONF_UNPACK_ARG(configs[i]);
-
-		if (param != BCM2835_PINCONF_PARAM_PULL)
-			return -EINVAL;
-
-		off = GPIO_REG_OFFSET(pin);
-		bit = GPIO_REG_SHIFT(pin);
-
-		bcm2835_gpio_wr(pc, GPPUD, arg & 3);
-		/*
-		 * Docs say to wait 150 cycles, but not of what. We assume a
-		 * 1 MHz clock here, which is pretty slow...
-		 */
-		udelay(150);
-		bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), BIT(bit));
-		udelay(150);
-		bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), 0);
-	} /* for each config */
-
-	return 0;
-}
-
-static const struct pinconf_ops bcm2835_pinconf_ops = {
-	.pin_config_get = bcm2835_pinconf_get,
-	.pin_config_set = bcm2835_pinconf_set,
-};
-
-static struct pinctrl_desc bcm2835_pinctrl_desc = {
-	.name = MODULE_NAME,
-	.pins = bcm2835_gpio_pins,
-	.npins = ARRAY_SIZE(bcm2835_gpio_pins),
-	.pctlops = &bcm2835_pctl_ops,
-	.pmxops = &bcm2835_pmx_ops,
-	.confops = &bcm2835_pinconf_ops,
-	.owner = THIS_MODULE,
-};
-
-static struct pinctrl_gpio_range bcm2835_pinctrl_gpio_range = {
-	.name = MODULE_NAME,
-	.npins = BCM2835_NUM_GPIOS,
-};
-
-static int bcm2835_pinctrl_probe(struct platform_device *pdev)
-{
-	struct device *dev = &pdev->dev;
-	struct device_node *np = dev->of_node;
-	struct bcm2835_pinctrl *pc;
-	struct resource iomem;
-	int err, i;
-	BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_pins) != BCM2835_NUM_GPIOS);
-	BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_groups) != BCM2835_NUM_GPIOS);
-
-	pc = devm_kzalloc(dev, sizeof(*pc), GFP_KERNEL);
-	if (!pc)
-		return -ENOMEM;
-
-	platform_set_drvdata(pdev, pc);
-	pc->dev = dev;
-
-	err = of_address_to_resource(np, 0, &iomem);
-	if (err) {
-		dev_err(dev, "could not get IO memory\n");
-		return err;
-	}
-
-	pc->base = devm_ioremap_resource(dev, &iomem);
-	if (IS_ERR(pc->base))
-		return PTR_ERR(pc->base);
-
-	pc->gpio_chip = bcm2835_gpio_chip;
-	pc->gpio_chip.dev = dev;
-	pc->gpio_chip.of_node = np;
-
-	pc->irq_domain = irq_domain_add_linear(np, BCM2835_NUM_GPIOS,
-			&irq_domain_simple_ops, NULL);
-	if (!pc->irq_domain) {
-		dev_err(dev, "could not create IRQ domain\n");
-		return -ENOMEM;
-	}
-
-	for (i = 0; i < BCM2835_NUM_GPIOS; i++) {
-		int irq = irq_create_mapping(pc->irq_domain, i);
-		irq_set_lockdep_class(irq, &gpio_lock_class);
-		irq_set_chip_and_handler(irq, &bcm2835_gpio_irq_chip,
-				handle_simple_irq);
-		irq_set_chip_data(irq, pc);
-		set_irq_flags(irq, IRQF_VALID);
-	}
-
-	for (i = 0; i < BCM2835_NUM_BANKS; i++) {
-		unsigned long events;
-		unsigned offset;
-		int len;
-		char *name;
-
-		/* clear event detection flags */
-		bcm2835_gpio_wr(pc, GPREN0 + i * 4, 0);
-		bcm2835_gpio_wr(pc, GPFEN0 + i * 4, 0);
-		bcm2835_gpio_wr(pc, GPHEN0 + i * 4, 0);
-		bcm2835_gpio_wr(pc, GPLEN0 + i * 4, 0);
-		bcm2835_gpio_wr(pc, GPAREN0 + i * 4, 0);
-		bcm2835_gpio_wr(pc, GPAFEN0 + i * 4, 0);
-
-		/* clear all the events */
-		events = bcm2835_gpio_rd(pc, GPEDS0 + i * 4);
-		for_each_set_bit(offset, &events, 32)
-			bcm2835_gpio_wr(pc, GPEDS0 + i * 4, BIT(offset));
-
-		pc->irq[i] = irq_of_parse_and_map(np, i);
-		pc->irq_data[i].pc = pc;
-		pc->irq_data[i].bank = i;
-		spin_lock_init(&pc->irq_lock[i]);
-
-		len = strlen(dev_name(pc->dev)) + 16;
-		name = devm_kzalloc(pc->dev, len, GFP_KERNEL);
-		if (!name)
-			return -ENOMEM;
-		snprintf(name, len, "%s:bank%d", dev_name(pc->dev), i);
-
-		err = devm_request_irq(dev, pc->irq[i],
-			bcm2835_gpio_irq_handler, IRQF_SHARED,
-			name, &pc->irq_data[i]);
-		if (err) {
-			dev_err(dev, "unable to request IRQ %d\n", pc->irq[i]);
-			return err;
-		}
-	}
-
-	err = gpiochip_add(&pc->gpio_chip);
-	if (err) {
-		dev_err(dev, "could not add GPIO chip\n");
-		return err;
-	}
-
-	pc->pctl_dev = pinctrl_register(&bcm2835_pinctrl_desc, dev, pc);
-	if (!pc->pctl_dev) {
-		gpiochip_remove(&pc->gpio_chip);
-		return -EINVAL;
-	}
-
-	pc->gpio_range = bcm2835_pinctrl_gpio_range;
-	pc->gpio_range.base = pc->gpio_chip.base;
-	pc->gpio_range.gc = &pc->gpio_chip;
-	pinctrl_add_gpio_range(pc->pctl_dev, &pc->gpio_range);
-
-	return 0;
-}
-
-static int bcm2835_pinctrl_remove(struct platform_device *pdev)
-{
-	struct bcm2835_pinctrl *pc = platform_get_drvdata(pdev);
-
-	pinctrl_unregister(pc->pctl_dev);
-	gpiochip_remove(&pc->gpio_chip);
-
-	return 0;
-}
-
-static struct of_device_id bcm2835_pinctrl_match[] = {
-	{ .compatible = "brcm,bcm2835-gpio" },
-	{}
-};
-MODULE_DEVICE_TABLE(of, bcm2835_pinctrl_match);
-
-static struct platform_driver bcm2835_pinctrl_driver = {
-	.probe = bcm2835_pinctrl_probe,
-	.remove = bcm2835_pinctrl_remove,
-	.driver = {
-		.name = MODULE_NAME,
-		.of_match_table = bcm2835_pinctrl_match,
-	},
-};
-module_platform_driver(bcm2835_pinctrl_driver);
-
-MODULE_AUTHOR("Chris Boot, Simon Arlott, Stephen Warren");
-MODULE_DESCRIPTION("BCM2835 Pin control driver");
-MODULE_LICENSE("GPL");
-- 
1.7.9.5

[PATCH v4 1/4] pinctrl: bcm: consolidate Broadcom pinctrl drivers

[Ray Jui]

Consolidate Broadcom pinctrl drivers into drivers/pinctrl/bcm/*

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 drivers/pinctrl/Kconfig                |   19 +-
 drivers/pinctrl/Makefile               |    4 +-
 drivers/pinctrl/bcm/Kconfig            |   21 +
 drivers/pinctrl/bcm/Makefile           |    4 +
 drivers/pinctrl/bcm/pinctrl-bcm281xx.c | 1455 ++++++++++++++++++++++++++++++++
 drivers/pinctrl/bcm/pinctrl-bcm2835.c  | 1072 +++++++++++++++++++++++
 drivers/pinctrl/pinctrl-bcm281xx.c     | 1455 --------------------------------
 drivers/pinctrl/pinctrl-bcm2835.c      | 1072 -----------------------
 8 files changed, 2555 insertions(+), 2547 deletions(-)
 create mode 100644 drivers/pinctrl/bcm/Kconfig
 create mode 100644 drivers/pinctrl/bcm/Makefile
 create mode 100644 drivers/pinctrl/bcm/pinctrl-bcm281xx.c
 create mode 100644 drivers/pinctrl/bcm/pinctrl-bcm2835.c
 delete mode 100644 drivers/pinctrl/pinctrl-bcm281xx.c
 delete mode 100644 drivers/pinctrl/pinctrl-bcm2835.c

diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index d014f22..6cfdad7 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -67,24 +67,6 @@ config PINCTRL_AT91
 	help
 	  Say Y here to enable the at91 pinctrl driver
 
-config PINCTRL_BCM2835
-	bool
-	select PINMUX
-	select PINCONF
-
-config PINCTRL_BCM281XX
-	bool "Broadcom BCM281xx pinctrl driver"
-	depends on OF && (ARCH_BCM_MOBILE || COMPILE_TEST)
-	select PINMUX
-	select PINCONF
-	select GENERIC_PINCONF
-	select REGMAP_MMIO
-	help
-	  Say Y here to support Broadcom BCM281xx pinctrl driver, which is used
-	  for the BCM281xx SoC family, including BCM11130, BCM11140, BCM11351,
-	  BCM28145, and BCM28155 SoCs.  This driver requires the pinctrl
-	  framework.  GPIO is provided by a separate GPIO driver.
-
 config PINCTRL_LANTIQ
 	bool
 	depends on LANTIQ
@@ -191,6 +173,7 @@ config PINCTRL_PALMAS
 	  open drain configuration for the Palmas series devices like
 	  TPS65913, TPS80036 etc.
 
+source "drivers/pinctrl/bcm/Kconfig"
 source "drivers/pinctrl/berlin/Kconfig"
 source "drivers/pinctrl/freescale/Kconfig"
 source "drivers/pinctrl/intel/Kconfig"
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index c030b3d..c018bbf 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -14,8 +14,6 @@ obj-$(CONFIG_PINCTRL_AS3722)	+= pinctrl-as3722.o
 obj-$(CONFIG_PINCTRL_BF54x)	+= pinctrl-adi2-bf54x.o
 obj-$(CONFIG_PINCTRL_BF60x)	+= pinctrl-adi2-bf60x.o
 obj-$(CONFIG_PINCTRL_AT91)	+= pinctrl-at91.o
-obj-$(CONFIG_PINCTRL_BCM2835)	+= pinctrl-bcm2835.o
-obj-$(CONFIG_PINCTRL_BCM281XX)	+= pinctrl-bcm281xx.o
 obj-$(CONFIG_PINCTRL_FALCON)	+= pinctrl-falcon.o
 obj-$(CONFIG_PINCTRL_PALMAS)	+= pinctrl-palmas.o
 obj-$(CONFIG_PINCTRL_ROCKCHIP)	+= pinctrl-rockchip.o
@@ -36,6 +34,8 @@ obj-$(CONFIG_PINCTRL_LANTIQ)	+= pinctrl-lantiq.o
 obj-$(CONFIG_PINCTRL_TB10X)	+= pinctrl-tb10x.o
 obj-$(CONFIG_PINCTRL_ST) 	+= pinctrl-st.o
 
+obj-$(CONFIG_ARCH_BCM)		+= bcm/
+obj-$(CONFIG_ARCH_BCM2835)	+= bcm/
 obj-$(CONFIG_ARCH_BERLIN)	+= berlin/
 obj-y				+= freescale/
 obj-$(CONFIG_X86)		+= intel/
diff --git a/drivers/pinctrl/bcm/Kconfig b/drivers/pinctrl/bcm/Kconfig
new file mode 100644
index 0000000..bc6d048
--- /dev/null
+++ b/drivers/pinctrl/bcm/Kconfig
@@ -0,0 +1,21 @@
+#
+# Broadcom pinctrl drivers
+#
+
+config PINCTRL_BCM281XX
+	bool "Broadcom BCM281xx pinctrl driver"
+	depends on OF && (ARCH_BCM_MOBILE || COMPILE_TEST)
+	select PINMUX
+	select PINCONF
+	select GENERIC_PINCONF
+	select REGMAP_MMIO
+	help
+	  Say Y here to support Broadcom BCM281xx pinctrl driver, which is used
+	  for the BCM281xx SoC family, including BCM11130, BCM11140, BCM11351,
+	  BCM28145, and BCM28155 SoCs.  This driver requires the pinctrl
+	  framework.  GPIO is provided by a separate GPIO driver.
+
+config PINCTRL_BCM2835
+	bool
+	select PINMUX
+	select PINCONF
diff --git a/drivers/pinctrl/bcm/Makefile b/drivers/pinctrl/bcm/Makefile
new file mode 100644
index 0000000..7ba80a3
--- /dev/null
+++ b/drivers/pinctrl/bcm/Makefile
@@ -0,0 +1,4 @@
+# Broadcom pinctrl support
+
+obj-$(CONFIG_PINCTRL_BCM281XX)	+= pinctrl-bcm281xx.o
+obj-$(CONFIG_PINCTRL_BCM2835)	+= pinctrl-bcm2835.o
diff --git a/drivers/pinctrl/bcm/pinctrl-bcm281xx.c b/drivers/pinctrl/bcm/pinctrl-bcm281xx.c
new file mode 100644
index 0000000..73d99076
--- /dev/null
+++ b/drivers/pinctrl/bcm/pinctrl-bcm281xx.c
@@ -0,0 +1,1455 @@
+/*
+ * Copyright (C) 2013 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include "../core.h"
+#include "../pinctrl-utils.h"
+
+/* BCM281XX Pin Control Registers Definitions */
+
+/* Function Select bits are the same for all pin control registers */
+#define BCM281XX_PIN_REG_F_SEL_MASK		0x0700
+#define BCM281XX_PIN_REG_F_SEL_SHIFT		8
+
+/* Standard pin register */
+#define BCM281XX_STD_PIN_REG_DRV_STR_MASK	0x0007
+#define BCM281XX_STD_PIN_REG_DRV_STR_SHIFT	0
+#define BCM281XX_STD_PIN_REG_INPUT_DIS_MASK	0x0008
+#define BCM281XX_STD_PIN_REG_INPUT_DIS_SHIFT	3
+#define BCM281XX_STD_PIN_REG_SLEW_MASK		0x0010
+#define BCM281XX_STD_PIN_REG_SLEW_SHIFT		4
+#define BCM281XX_STD_PIN_REG_PULL_UP_MASK	0x0020
+#define BCM281XX_STD_PIN_REG_PULL_UP_SHIFT	5
+#define BCM281XX_STD_PIN_REG_PULL_DN_MASK	0x0040
+#define BCM281XX_STD_PIN_REG_PULL_DN_SHIFT	6
+#define BCM281XX_STD_PIN_REG_HYST_MASK		0x0080
+#define BCM281XX_STD_PIN_REG_HYST_SHIFT		7
+
+/* I2C pin register */
+#define BCM281XX_I2C_PIN_REG_INPUT_DIS_MASK	0x0004
+#define BCM281XX_I2C_PIN_REG_INPUT_DIS_SHIFT	2
+#define BCM281XX_I2C_PIN_REG_SLEW_MASK		0x0008
+#define BCM281XX_I2C_PIN_REG_SLEW_SHIFT		3
+#define BCM281XX_I2C_PIN_REG_PULL_UP_STR_MASK	0x0070
+#define BCM281XX_I2C_PIN_REG_PULL_UP_STR_SHIFT	4
+
+/* HDMI pin register */
+#define BCM281XX_HDMI_PIN_REG_INPUT_DIS_MASK	0x0008
+#define BCM281XX_HDMI_PIN_REG_INPUT_DIS_SHIFT	3
+#define BCM281XX_HDMI_PIN_REG_MODE_MASK		0x0010
+#define BCM281XX_HDMI_PIN_REG_MODE_SHIFT	4
+
+/**
+ * bcm281xx_pin_type - types of pin register
+ */
+enum bcm281xx_pin_type {
+	BCM281XX_PIN_TYPE_UNKNOWN = 0,
+	BCM281XX_PIN_TYPE_STD,
+	BCM281XX_PIN_TYPE_I2C,
+	BCM281XX_PIN_TYPE_HDMI,
+};
+
+static enum bcm281xx_pin_type std_pin = BCM281XX_PIN_TYPE_STD;
+static enum bcm281xx_pin_type i2c_pin = BCM281XX_PIN_TYPE_I2C;
+static enum bcm281xx_pin_type hdmi_pin = BCM281XX_PIN_TYPE_HDMI;
+
+/**
+ * bcm281xx_pin_function- define pin function
+ */
+struct bcm281xx_pin_function {
+	const char *name;
+	const char * const *groups;
+	const unsigned ngroups;
+};
+
+/**
+ * bcm281xx_pinctrl_data - Broadcom-specific pinctrl data
+ * @reg_base - base of pinctrl registers
+ */
+struct bcm281xx_pinctrl_data {
+	void __iomem *reg_base;
+
+	/* List of all pins */
+	const struct pinctrl_pin_desc *pins;
+	const unsigned npins;
+
+	const struct bcm281xx_pin_function *functions;
+	const unsigned nfunctions;
+
+	struct regmap *regmap;
+};
+
+/*
+ * Pin number definition.  The order here must be the same as defined in the
+ * PADCTRLREG block in the RDB.
+ */
+#define BCM281XX_PIN_ADCSYNC		0
+#define BCM281XX_PIN_BAT_RM		1
+#define BCM281XX_PIN_BSC1_SCL		2
+#define BCM281XX_PIN_BSC1_SDA		3
+#define BCM281XX_PIN_BSC2_SCL		4
+#define BCM281XX_PIN_BSC2_SDA		5
+#define BCM281XX_PIN_CLASSGPWR		6
+#define BCM281XX_PIN_CLK_CX8		7
+#define BCM281XX_PIN_CLKOUT_0		8
+#define BCM281XX_PIN_CLKOUT_1		9
+#define BCM281XX_PIN_CLKOUT_2		10
+#define BCM281XX_PIN_CLKOUT_3		11
+#define BCM281XX_PIN_CLKREQ_IN_0	12
+#define BCM281XX_PIN_CLKREQ_IN_1	13
+#define BCM281XX_PIN_CWS_SYS_REQ1	14
+#define BCM281XX_PIN_CWS_SYS_REQ2	15
+#define BCM281XX_PIN_CWS_SYS_REQ3	16
+#define BCM281XX_PIN_DIGMIC1_CLK	17
+#define BCM281XX_PIN_DIGMIC1_DQ		18
+#define BCM281XX_PIN_DIGMIC2_CLK	19
+#define BCM281XX_PIN_DIGMIC2_DQ		20
+#define BCM281XX_PIN_GPEN13		21
+#define BCM281XX_PIN_GPEN14		22
+#define BCM281XX_PIN_GPEN15		23
+#define BCM281XX_PIN_GPIO00		24
+#define BCM281XX_PIN_GPIO01		25
+#define BCM281XX_PIN_GPIO02		26
+#define BCM281XX_PIN_GPIO03		27
+#define BCM281XX_PIN_GPIO04		28
+#define BCM281XX_PIN_GPIO05		29
+#define BCM281XX_PIN_GPIO06		30
+#define BCM281XX_PIN_GPIO07		31
+#define BCM281XX_PIN_GPIO08		32
+#define BCM281XX_PIN_GPIO09		33
+#define BCM281XX_PIN_GPIO10		34
+#define BCM281XX_PIN_GPIO11		35
+#define BCM281XX_PIN_GPIO12		36
+#define BCM281XX_PIN_GPIO13		37
+#define BCM281XX_PIN_GPIO14		38
+#define BCM281XX_PIN_GPS_PABLANK	39
+#define BCM281XX_PIN_GPS_TMARK		40
+#define BCM281XX_PIN_HDMI_SCL		41
+#define BCM281XX_PIN_HDMI_SDA		42
+#define BCM281XX_PIN_IC_DM		43
+#define BCM281XX_PIN_IC_DP		44
+#define BCM281XX_PIN_KP_COL_IP_0	45
+#define BCM281XX_PIN_KP_COL_IP_1	46
+#define BCM281XX_PIN_KP_COL_IP_2	47
+#define BCM281XX_PIN_KP_COL_IP_3	48
+#define BCM281XX_PIN_KP_ROW_OP_0	49
+#define BCM281XX_PIN_KP_ROW_OP_1	50
+#define BCM281XX_PIN_KP_ROW_OP_2	51
+#define BCM281XX_PIN_KP_ROW_OP_3	52
+#define BCM281XX_PIN_LCD_B_0		53
+#define BCM281XX_PIN_LCD_B_1		54
+#define BCM281XX_PIN_LCD_B_2		55
+#define BCM281XX_PIN_LCD_B_3		56
+#define BCM281XX_PIN_LCD_B_4		57
+#define BCM281XX_PIN_LCD_B_5		58
+#define BCM281XX_PIN_LCD_B_6		59
+#define BCM281XX_PIN_LCD_B_7		60
+#define BCM281XX_PIN_LCD_G_0		61
+#define BCM281XX_PIN_LCD_G_1		62
+#define BCM281XX_PIN_LCD_G_2		63
+#define BCM281XX_PIN_LCD_G_3		64
+#define BCM281XX_PIN_LCD_G_4		65
+#define BCM281XX_PIN_LCD_G_5		66
+#define BCM281XX_PIN_LCD_G_6		67
+#define BCM281XX_PIN_LCD_G_7		68
+#define BCM281XX_PIN_LCD_HSYNC		69
+#define BCM281XX_PIN_LCD_OE		70
+#define BCM281XX_PIN_LCD_PCLK		71
+#define BCM281XX_PIN_LCD_R_0		72
+#define BCM281XX_PIN_LCD_R_1		73
+#define BCM281XX_PIN_LCD_R_2		74
+#define BCM281XX_PIN_LCD_R_3		75
+#define BCM281XX_PIN_LCD_R_4		76
+#define BCM281XX_PIN_LCD_R_5		77
+#define BCM281XX_PIN_LCD_R_6		78
+#define BCM281XX_PIN_LCD_R_7		79
+#define BCM281XX_PIN_LCD_VSYNC		80
+#define BCM281XX_PIN_MDMGPIO0		81
+#define BCM281XX_PIN_MDMGPIO1		82
+#define BCM281XX_PIN_MDMGPIO2		83
+#define BCM281XX_PIN_MDMGPIO3		84
+#define BCM281XX_PIN_MDMGPIO4		85
+#define BCM281XX_PIN_MDMGPIO5		86
+#define BCM281XX_PIN_MDMGPIO6		87
+#define BCM281XX_PIN_MDMGPIO7		88
+#define BCM281XX_PIN_MDMGPIO8		89
+#define BCM281XX_PIN_MPHI_DATA_0	90
+#define BCM281XX_PIN_MPHI_DATA_1	91
+#define BCM281XX_PIN_MPHI_DATA_2	92
+#define BCM281XX_PIN_MPHI_DATA_3	93
+#define BCM281XX_PIN_MPHI_DATA_4	94
+#define BCM281XX_PIN_MPHI_DATA_5	95
+#define BCM281XX_PIN_MPHI_DATA_6	96
+#define BCM281XX_PIN_MPHI_DATA_7	97
+#define BCM281XX_PIN_MPHI_DATA_8	98
+#define BCM281XX_PIN_MPHI_DATA_9	99
+#define BCM281XX_PIN_MPHI_DATA_10	100
+#define BCM281XX_PIN_MPHI_DATA_11	101
+#define BCM281XX_PIN_MPHI_DATA_12	102
+#define BCM281XX_PIN_MPHI_DATA_13	103
+#define BCM281XX_PIN_MPHI_DATA_14	104
+#define BCM281XX_PIN_MPHI_DATA_15	105
+#define BCM281XX_PIN_MPHI_HA0		106
+#define BCM281XX_PIN_MPHI_HAT0		107
+#define BCM281XX_PIN_MPHI_HAT1		108
+#define BCM281XX_PIN_MPHI_HCE0_N	109
+#define BCM281XX_PIN_MPHI_HCE1_N	110
+#define BCM281XX_PIN_MPHI_HRD_N		111
+#define BCM281XX_PIN_MPHI_HWR_N		112
+#define BCM281XX_PIN_MPHI_RUN0		113
+#define BCM281XX_PIN_MPHI_RUN1		114
+#define BCM281XX_PIN_MTX_SCAN_CLK	115
+#define BCM281XX_PIN_MTX_SCAN_DATA	116
+#define BCM281XX_PIN_NAND_AD_0		117
+#define BCM281XX_PIN_NAND_AD_1		118
+#define BCM281XX_PIN_NAND_AD_2		119
+#define BCM281XX_PIN_NAND_AD_3		120
+#define BCM281XX_PIN_NAND_AD_4		121
+#define BCM281XX_PIN_NAND_AD_5		122
+#define BCM281XX_PIN_NAND_AD_6		123
+#define BCM281XX_PIN_NAND_AD_7		124
+#define BCM281XX_PIN_NAND_ALE		125
+#define BCM281XX_PIN_NAND_CEN_0		126
+#define BCM281XX_PIN_NAND_CEN_1		127
+#define BCM281XX_PIN_NAND_CLE		128
+#define BCM281XX_PIN_NAND_OEN		129
+#define BCM281XX_PIN_NAND_RDY_0		130
+#define BCM281XX_PIN_NAND_RDY_1		131
+#define BCM281XX_PIN_NAND_WEN		132
+#define BCM281XX_PIN_NAND_WP		133
+#define BCM281XX_PIN_PC1		134
+#define BCM281XX_PIN_PC2		135
+#define BCM281XX_PIN_PMU_INT		136
+#define BCM281XX_PIN_PMU_SCL		137
+#define BCM281XX_PIN_PMU_SDA		138
+#define BCM281XX_PIN_RFST2G_MTSLOTEN3G	139
+#define BCM281XX_PIN_RGMII_0_RX_CTL	140
+#define BCM281XX_PIN_RGMII_0_RXC	141
+#define BCM281XX_PIN_RGMII_0_RXD_0	142
+#define BCM281XX_PIN_RGMII_0_RXD_1	143
+#define BCM281XX_PIN_RGMII_0_RXD_2	144
+#define BCM281XX_PIN_RGMII_0_RXD_3	145
+#define BCM281XX_PIN_RGMII_0_TX_CTL	146
+#define BCM281XX_PIN_RGMII_0_TXC	147
+#define BCM281XX_PIN_RGMII_0_TXD_0	148
+#define BCM281XX_PIN_RGMII_0_TXD_1	149
+#define BCM281XX_PIN_RGMII_0_TXD_2	150
+#define BCM281XX_PIN_RGMII_0_TXD_3	151
+#define BCM281XX_PIN_RGMII_1_RX_CTL	152
+#define BCM281XX_PIN_RGMII_1_RXC	153
+#define BCM281XX_PIN_RGMII_1_RXD_0	154
+#define BCM281XX_PIN_RGMII_1_RXD_1	155
+#define BCM281XX_PIN_RGMII_1_RXD_2	156
+#define BCM281XX_PIN_RGMII_1_RXD_3	157
+#define BCM281XX_PIN_RGMII_1_TX_CTL	158
+#define BCM281XX_PIN_RGMII_1_TXC	159
+#define BCM281XX_PIN_RGMII_1_TXD_0	160
+#define BCM281XX_PIN_RGMII_1_TXD_1	161
+#define BCM281XX_PIN_RGMII_1_TXD_2	162
+#define BCM281XX_PIN_RGMII_1_TXD_3	163
+#define BCM281XX_PIN_RGMII_GPIO_0	164
+#define BCM281XX_PIN_RGMII_GPIO_1	165
+#define BCM281XX_PIN_RGMII_GPIO_2	166
+#define BCM281XX_PIN_RGMII_GPIO_3	167
+#define BCM281XX_PIN_RTXDATA2G_TXDATA3G1	168
+#define BCM281XX_PIN_RTXEN2G_TXDATA3G2	169
+#define BCM281XX_PIN_RXDATA3G0		170
+#define BCM281XX_PIN_RXDATA3G1		171
+#define BCM281XX_PIN_RXDATA3G2		172
+#define BCM281XX_PIN_SDIO1_CLK		173
+#define BCM281XX_PIN_SDIO1_CMD		174
+#define BCM281XX_PIN_SDIO1_DATA_0	175
+#define BCM281XX_PIN_SDIO1_DATA_1	176
+#define BCM281XX_PIN_SDIO1_DATA_2	177
+#define BCM281XX_PIN_SDIO1_DATA_3	178
+#define BCM281XX_PIN_SDIO4_CLK		179
+#define BCM281XX_PIN_SDIO4_CMD		180
+#define BCM281XX_PIN_SDIO4_DATA_0	181
+#define BCM281XX_PIN_SDIO4_DATA_1	182
+#define BCM281XX_PIN_SDIO4_DATA_2	183
+#define BCM281XX_PIN_SDIO4_DATA_3	184
+#define BCM281XX_PIN_SIM_CLK		185
+#define BCM281XX_PIN_SIM_DATA		186
+#define BCM281XX_PIN_SIM_DET		187
+#define BCM281XX_PIN_SIM_RESETN		188
+#define BCM281XX_PIN_SIM2_CLK		189
+#define BCM281XX_PIN_SIM2_DATA		190
+#define BCM281XX_PIN_SIM2_DET		191
+#define BCM281XX_PIN_SIM2_RESETN	192
+#define BCM281XX_PIN_SRI_C		193
+#define BCM281XX_PIN_SRI_D		194
+#define BCM281XX_PIN_SRI_E		195
+#define BCM281XX_PIN_SSP_EXTCLK		196
+#define BCM281XX_PIN_SSP0_CLK		197
+#define BCM281XX_PIN_SSP0_FS		198
+#define BCM281XX_PIN_SSP0_RXD		199
+#define BCM281XX_PIN_SSP0_TXD		200
+#define BCM281XX_PIN_SSP2_CLK		201
+#define BCM281XX_PIN_SSP2_FS_0		202
+#define BCM281XX_PIN_SSP2_FS_1		203
+#define BCM281XX_PIN_SSP2_FS_2		204
+#define BCM281XX_PIN_SSP2_FS_3		205
+#define BCM281XX_PIN_SSP2_RXD_0		206
+#define BCM281XX_PIN_SSP2_RXD_1		207
+#define BCM281XX_PIN_SSP2_TXD_0		208
+#define BCM281XX_PIN_SSP2_TXD_1		209
+#define BCM281XX_PIN_SSP3_CLK		210
+#define BCM281XX_PIN_SSP3_FS		211
+#define BCM281XX_PIN_SSP3_RXD		212
+#define BCM281XX_PIN_SSP3_TXD		213
+#define BCM281XX_PIN_SSP4_CLK		214
+#define BCM281XX_PIN_SSP4_FS		215
+#define BCM281XX_PIN_SSP4_RXD		216
+#define BCM281XX_PIN_SSP4_TXD		217
+#define BCM281XX_PIN_SSP5_CLK		218
+#define BCM281XX_PIN_SSP5_FS		219
+#define BCM281XX_PIN_SSP5_RXD		220
+#define BCM281XX_PIN_SSP5_TXD		221
+#define BCM281XX_PIN_SSP6_CLK		222
+#define BCM281XX_PIN_SSP6_FS		223
+#define BCM281XX_PIN_SSP6_RXD		224
+#define BCM281XX_PIN_SSP6_TXD		225
+#define BCM281XX_PIN_STAT_1		226
+#define BCM281XX_PIN_STAT_2		227
+#define BCM281XX_PIN_SYSCLKEN		228
+#define BCM281XX_PIN_TRACECLK		229
+#define BCM281XX_PIN_TRACEDT00		230
+#define BCM281XX_PIN_TRACEDT01		231
+#define BCM281XX_PIN_TRACEDT02		232
+#define BCM281XX_PIN_TRACEDT03		233
+#define BCM281XX_PIN_TRACEDT04		234
+#define BCM281XX_PIN_TRACEDT05		235
+#define BCM281XX_PIN_TRACEDT06		236
+#define BCM281XX_PIN_TRACEDT07		237
+#define BCM281XX_PIN_TRACEDT08		238
+#define BCM281XX_PIN_TRACEDT09		239
+#define BCM281XX_PIN_TRACEDT10		240
+#define BCM281XX_PIN_TRACEDT11		241
+#define BCM281XX_PIN_TRACEDT12		242
+#define BCM281XX_PIN_TRACEDT13		243
+#define BCM281XX_PIN_TRACEDT14		244
+#define BCM281XX_PIN_TRACEDT15		245
+#define BCM281XX_PIN_TXDATA3G0		246
+#define BCM281XX_PIN_TXPWRIND		247
+#define BCM281XX_PIN_UARTB1_UCTS	248
+#define BCM281XX_PIN_UARTB1_URTS	249
+#define BCM281XX_PIN_UARTB1_URXD	250
+#define BCM281XX_PIN_UARTB1_UTXD	251
+#define BCM281XX_PIN_UARTB2_URXD	252
+#define BCM281XX_PIN_UARTB2_UTXD	253
+#define BCM281XX_PIN_UARTB3_UCTS	254
+#define BCM281XX_PIN_UARTB3_URTS	255
+#define BCM281XX_PIN_UARTB3_URXD	256
+#define BCM281XX_PIN_UARTB3_UTXD	257
+#define BCM281XX_PIN_UARTB4_UCTS	258
+#define BCM281XX_PIN_UARTB4_URTS	259
+#define BCM281XX_PIN_UARTB4_URXD	260
+#define BCM281XX_PIN_UARTB4_UTXD	261
+#define BCM281XX_PIN_VC_CAM1_SCL	262
+#define BCM281XX_PIN_VC_CAM1_SDA	263
+#define BCM281XX_PIN_VC_CAM2_SCL	264
+#define BCM281XX_PIN_VC_CAM2_SDA	265
+#define BCM281XX_PIN_VC_CAM3_SCL	266
+#define BCM281XX_PIN_VC_CAM3_SDA	267
+
+#define BCM281XX_PIN_DESC(a, b, c) \
+	{ .number = a, .name = b, .drv_data = &c##_pin }
+
+/*
+ * Pin description definition.  The order here must be the same as defined in
+ * the PADCTRLREG block in the RDB, since the pin number is used as an index
+ * into this array.
+ */
+static const struct pinctrl_pin_desc bcm281xx_pinctrl_pins[] = {
+	BCM281XX_PIN_DESC(BCM281XX_PIN_ADCSYNC, "adcsync", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_BAT_RM, "bat_rm", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_BSC1_SCL, "bsc1_scl", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_BSC1_SDA, "bsc1_sda", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_BSC2_SCL, "bsc2_scl", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_BSC2_SDA, "bsc2_sda", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CLASSGPWR, "classgpwr", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CLK_CX8, "clk_cx8", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKOUT_0, "clkout_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKOUT_1, "clkout_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKOUT_2, "clkout_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKOUT_3, "clkout_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKREQ_IN_0, "clkreq_in_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKREQ_IN_1, "clkreq_in_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CWS_SYS_REQ1, "cws_sys_req1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CWS_SYS_REQ2, "cws_sys_req2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_CWS_SYS_REQ3, "cws_sys_req3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_DIGMIC1_CLK, "digmic1_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_DIGMIC1_DQ, "digmic1_dq", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_DIGMIC2_CLK, "digmic2_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_DIGMIC2_DQ, "digmic2_dq", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPEN13, "gpen13", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPEN14, "gpen14", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPEN15, "gpen15", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO00, "gpio00", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO01, "gpio01", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO02, "gpio02", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO03, "gpio03", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO04, "gpio04", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO05, "gpio05", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO06, "gpio06", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO07, "gpio07", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO08, "gpio08", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO09, "gpio09", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO10, "gpio10", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO11, "gpio11", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO12, "gpio12", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO13, "gpio13", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO14, "gpio14", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPS_PABLANK, "gps_pablank", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_GPS_TMARK, "gps_tmark", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_HDMI_SCL, "hdmi_scl", hdmi),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_HDMI_SDA, "hdmi_sda", hdmi),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_IC_DM, "ic_dm", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_IC_DP, "ic_dp", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_COL_IP_0, "kp_col_ip_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_COL_IP_1, "kp_col_ip_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_COL_IP_2, "kp_col_ip_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_COL_IP_3, "kp_col_ip_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_ROW_OP_0, "kp_row_op_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_ROW_OP_1, "kp_row_op_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_ROW_OP_2, "kp_row_op_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_ROW_OP_3, "kp_row_op_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_0, "lcd_b_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_1, "lcd_b_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_2, "lcd_b_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_3, "lcd_b_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_4, "lcd_b_4", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_5, "lcd_b_5", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_6, "lcd_b_6", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_7, "lcd_b_7", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_0, "lcd_g_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_1, "lcd_g_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_2, "lcd_g_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_3, "lcd_g_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_4, "lcd_g_4", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_5, "lcd_g_5", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_6, "lcd_g_6", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_7, "lcd_g_7", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_HSYNC, "lcd_hsync", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_OE, "lcd_oe", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_PCLK, "lcd_pclk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_0, "lcd_r_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_1, "lcd_r_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_2, "lcd_r_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_3, "lcd_r_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_4, "lcd_r_4", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_5, "lcd_r_5", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_6, "lcd_r_6", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_7, "lcd_r_7", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_VSYNC, "lcd_vsync", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO0, "mdmgpio0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO1, "mdmgpio1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO2, "mdmgpio2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO3, "mdmgpio3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO4, "mdmgpio4", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO5, "mdmgpio5", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO6, "mdmgpio6", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO7, "mdmgpio7", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO8, "mdmgpio8", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_0, "mphi_data_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_1, "mphi_data_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_2, "mphi_data_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_3, "mphi_data_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_4, "mphi_data_4", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_5, "mphi_data_5", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_6, "mphi_data_6", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_7, "mphi_data_7", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_8, "mphi_data_8", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_9, "mphi_data_9", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_10, "mphi_data_10", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_11, "mphi_data_11", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_12, "mphi_data_12", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_13, "mphi_data_13", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_14, "mphi_data_14", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_15, "mphi_data_15", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HA0, "mphi_ha0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HAT0, "mphi_hat0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HAT1, "mphi_hat1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HCE0_N, "mphi_hce0_n", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HCE1_N, "mphi_hce1_n", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HRD_N, "mphi_hrd_n", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HWR_N, "mphi_hwr_n", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_RUN0, "mphi_run0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_RUN1, "mphi_run1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MTX_SCAN_CLK, "mtx_scan_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_MTX_SCAN_DATA, "mtx_scan_data", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_0, "nand_ad_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_1, "nand_ad_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_2, "nand_ad_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_3, "nand_ad_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_4, "nand_ad_4", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_5, "nand_ad_5", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_6, "nand_ad_6", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_7, "nand_ad_7", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_ALE, "nand_ale", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_CEN_0, "nand_cen_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_CEN_1, "nand_cen_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_CLE, "nand_cle", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_OEN, "nand_oen", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_RDY_0, "nand_rdy_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_RDY_1, "nand_rdy_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_WEN, "nand_wen", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_WP, "nand_wp", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_PC1, "pc1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_PC2, "pc2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_PMU_INT, "pmu_int", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_PMU_SCL, "pmu_scl", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_PMU_SDA, "pmu_sda", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RFST2G_MTSLOTEN3G, "rfst2g_mtsloten3g",
+		std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RX_CTL, "rgmii_0_rx_ctl", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXC, "rgmii_0_rxc", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXD_0, "rgmii_0_rxd_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXD_1, "rgmii_0_rxd_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXD_2, "rgmii_0_rxd_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXD_3, "rgmii_0_rxd_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TX_CTL, "rgmii_0_tx_ctl", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXC, "rgmii_0_txc", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXD_0, "rgmii_0_txd_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXD_1, "rgmii_0_txd_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXD_2, "rgmii_0_txd_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXD_3, "rgmii_0_txd_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RX_CTL, "rgmii_1_rx_ctl", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXC, "rgmii_1_rxc", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXD_0, "rgmii_1_rxd_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXD_1, "rgmii_1_rxd_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXD_2, "rgmii_1_rxd_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXD_3, "rgmii_1_rxd_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TX_CTL, "rgmii_1_tx_ctl", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXC, "rgmii_1_txc", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXD_0, "rgmii_1_txd_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXD_1, "rgmii_1_txd_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXD_2, "rgmii_1_txd_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXD_3, "rgmii_1_txd_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_GPIO_0, "rgmii_gpio_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_GPIO_1, "rgmii_gpio_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_GPIO_2, "rgmii_gpio_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_GPIO_3, "rgmii_gpio_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RTXDATA2G_TXDATA3G1,
+		"rtxdata2g_txdata3g1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RTXEN2G_TXDATA3G2, "rtxen2g_txdata3g2",
+		std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RXDATA3G0, "rxdata3g0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RXDATA3G1, "rxdata3g1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_RXDATA3G2, "rxdata3g2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_CLK, "sdio1_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_CMD, "sdio1_cmd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_DATA_0, "sdio1_data_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_DATA_1, "sdio1_data_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_DATA_2, "sdio1_data_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_DATA_3, "sdio1_data_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_CLK, "sdio4_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_CMD, "sdio4_cmd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_DATA_0, "sdio4_data_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_DATA_1, "sdio4_data_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_DATA_2, "sdio4_data_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_DATA_3, "sdio4_data_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM_CLK, "sim_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM_DATA, "sim_data", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM_DET, "sim_det", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM_RESETN, "sim_resetn", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM2_CLK, "sim2_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM2_DATA, "sim2_data", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM2_DET, "sim2_det", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM2_RESETN, "sim2_resetn", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SRI_C, "sri_c", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SRI_D, "sri_d", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SRI_E, "sri_e", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP_EXTCLK, "ssp_extclk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP0_CLK, "ssp0_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP0_FS, "ssp0_fs", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP0_RXD, "ssp0_rxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP0_TXD, "ssp0_txd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_CLK, "ssp2_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_FS_0, "ssp2_fs_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_FS_1, "ssp2_fs_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_FS_2, "ssp2_fs_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_FS_3, "ssp2_fs_3", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_RXD_0, "ssp2_rxd_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_RXD_1, "ssp2_rxd_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_TXD_0, "ssp2_txd_0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_TXD_1, "ssp2_txd_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP3_CLK, "ssp3_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP3_FS, "ssp3_fs", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP3_RXD, "ssp3_rxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP3_TXD, "ssp3_txd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP4_CLK, "ssp4_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP4_FS, "ssp4_fs", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP4_RXD, "ssp4_rxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP4_TXD, "ssp4_txd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP5_CLK, "ssp5_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP5_FS, "ssp5_fs", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP5_RXD, "ssp5_rxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP5_TXD, "ssp5_txd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP6_CLK, "ssp6_clk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP6_FS, "ssp6_fs", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP6_RXD, "ssp6_rxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP6_TXD, "ssp6_txd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_STAT_1, "stat_1", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_STAT_2, "stat_2", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_SYSCLKEN, "sysclken", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACECLK, "traceclk", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT00, "tracedt00", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT01, "tracedt01", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT02, "tracedt02", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT03, "tracedt03", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT04, "tracedt04", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT05, "tracedt05", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT06, "tracedt06", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT07, "tracedt07", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT08, "tracedt08", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT09, "tracedt09", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT10, "tracedt10", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT11, "tracedt11", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT12, "tracedt12", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT13, "tracedt13", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT14, "tracedt14", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT15, "tracedt15", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TXDATA3G0, "txdata3g0", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_TXPWRIND, "txpwrind", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB1_UCTS, "uartb1_ucts", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB1_URTS, "uartb1_urts", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB1_URXD, "uartb1_urxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB1_UTXD, "uartb1_utxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB2_URXD, "uartb2_urxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB2_UTXD, "uartb2_utxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB3_UCTS, "uartb3_ucts", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB3_URTS, "uartb3_urts", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB3_URXD, "uartb3_urxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB3_UTXD, "uartb3_utxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB4_UCTS, "uartb4_ucts", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB4_URTS, "uartb4_urts", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB4_URXD, "uartb4_urxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB4_UTXD, "uartb4_utxd", std),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM1_SCL, "vc_cam1_scl", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM1_SDA, "vc_cam1_sda", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM2_SCL, "vc_cam2_scl", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM2_SDA, "vc_cam2_sda", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM3_SCL, "vc_cam3_scl", i2c),
+	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM3_SDA, "vc_cam3_sda", i2c),
+};
+
+static const char * const bcm281xx_alt_groups[] = {
+	"adcsync",
+	"bat_rm",
+	"bsc1_scl",
+	"bsc1_sda",
+	"bsc2_scl",
+	"bsc2_sda",
+	"classgpwr",
+	"clk_cx8",
+	"clkout_0",
+	"clkout_1",
+	"clkout_2",
+	"clkout_3",
+	"clkreq_in_0",
+	"clkreq_in_1",
+	"cws_sys_req1",
+	"cws_sys_req2",
+	"cws_sys_req3",
+	"digmic1_clk",
+	"digmic1_dq",
+	"digmic2_clk",
+	"digmic2_dq",
+	"gpen13",
+	"gpen14",
+	"gpen15",
+	"gpio00",
+	"gpio01",
+	"gpio02",
+	"gpio03",
+	"gpio04",
+	"gpio05",
+	"gpio06",
+	"gpio07",
+	"gpio08",
+	"gpio09",
+	"gpio10",
+	"gpio11",
+	"gpio12",
+	"gpio13",
+	"gpio14",
+	"gps_pablank",
+	"gps_tmark",
+	"hdmi_scl",
+	"hdmi_sda",
+	"ic_dm",
+	"ic_dp",
+	"kp_col_ip_0",
+	"kp_col_ip_1",
+	"kp_col_ip_2",
+	"kp_col_ip_3",
+	"kp_row_op_0",
+	"kp_row_op_1",
+	"kp_row_op_2",
+	"kp_row_op_3",
+	"lcd_b_0",
+	"lcd_b_1",
+	"lcd_b_2",
+	"lcd_b_3",
+	"lcd_b_4",
+	"lcd_b_5",
+	"lcd_b_6",
+	"lcd_b_7",
+	"lcd_g_0",
+	"lcd_g_1",
+	"lcd_g_2",
+	"lcd_g_3",
+	"lcd_g_4",
+	"lcd_g_5",
+	"lcd_g_6",
+	"lcd_g_7",
+	"lcd_hsync",
+	"lcd_oe",
+	"lcd_pclk",
+	"lcd_r_0",
+	"lcd_r_1",
+	"lcd_r_2",
+	"lcd_r_3",
+	"lcd_r_4",
+	"lcd_r_5",
+	"lcd_r_6",
+	"lcd_r_7",
+	"lcd_vsync",
+	"mdmgpio0",
+	"mdmgpio1",
+	"mdmgpio2",
+	"mdmgpio3",
+	"mdmgpio4",
+	"mdmgpio5",
+	"mdmgpio6",
+	"mdmgpio7",
+	"mdmgpio8",
+	"mphi_data_0",
+	"mphi_data_1",
+	"mphi_data_2",
+	"mphi_data_3",
+	"mphi_data_4",
+	"mphi_data_5",
+	"mphi_data_6",
+	"mphi_data_7",
+	"mphi_data_8",
+	"mphi_data_9",
+	"mphi_data_10",
+	"mphi_data_11",
+	"mphi_data_12",
+	"mphi_data_13",
+	"mphi_data_14",
+	"mphi_data_15",
+	"mphi_ha0",
+	"mphi_hat0",
+	"mphi_hat1",
+	"mphi_hce0_n",
+	"mphi_hce1_n",
+	"mphi_hrd_n",
+	"mphi_hwr_n",
+	"mphi_run0",
+	"mphi_run1",
+	"mtx_scan_clk",
+	"mtx_scan_data",
+	"nand_ad_0",
+	"nand_ad_1",
+	"nand_ad_2",
+	"nand_ad_3",
+	"nand_ad_4",
+	"nand_ad_5",
+	"nand_ad_6",
+	"nand_ad_7",
+	"nand_ale",
+	"nand_cen_0",
+	"nand_cen_1",
+	"nand_cle",
+	"nand_oen",
+	"nand_rdy_0",
+	"nand_rdy_1",
+	"nand_wen",
+	"nand_wp",
+	"pc1",
+	"pc2",
+	"pmu_int",
+	"pmu_scl",
+	"pmu_sda",
+	"rfst2g_mtsloten3g",
+	"rgmii_0_rx_ctl",
+	"rgmii_0_rxc",
+	"rgmii_0_rxd_0",
+	"rgmii_0_rxd_1",
+	"rgmii_0_rxd_2",
+	"rgmii_0_rxd_3",
+	"rgmii_0_tx_ctl",
+	"rgmii_0_txc",
+	"rgmii_0_txd_0",
+	"rgmii_0_txd_1",
+	"rgmii_0_txd_2",
+	"rgmii_0_txd_3",
+	"rgmii_1_rx_ctl",
+	"rgmii_1_rxc",
+	"rgmii_1_rxd_0",
+	"rgmii_1_rxd_1",
+	"rgmii_1_rxd_2",
+	"rgmii_1_rxd_3",
+	"rgmii_1_tx_ctl",
+	"rgmii_1_txc",
+	"rgmii_1_txd_0",
+	"rgmii_1_txd_1",
+	"rgmii_1_txd_2",
+	"rgmii_1_txd_3",
+	"rgmii_gpio_0",
+	"rgmii_gpio_1",
+	"rgmii_gpio_2",
+	"rgmii_gpio_3",
+	"rtxdata2g_txdata3g1",
+	"rtxen2g_txdata3g2",
+	"rxdata3g0",
+	"rxdata3g1",
+	"rxdata3g2",
+	"sdio1_clk",
+	"sdio1_cmd",
+	"sdio1_data_0",
+	"sdio1_data_1",
+	"sdio1_data_2",
+	"sdio1_data_3",
+	"sdio4_clk",
+	"sdio4_cmd",
+	"sdio4_data_0",
+	"sdio4_data_1",
+	"sdio4_data_2",
+	"sdio4_data_3",
+	"sim_clk",
+	"sim_data",
+	"sim_det",
+	"sim_resetn",
+	"sim2_clk",
+	"sim2_data",
+	"sim2_det",
+	"sim2_resetn",
+	"sri_c",
+	"sri_d",
+	"sri_e",
+	"ssp_extclk",
+	"ssp0_clk",
+	"ssp0_fs",
+	"ssp0_rxd",
+	"ssp0_txd",
+	"ssp2_clk",
+	"ssp2_fs_0",
+	"ssp2_fs_1",
+	"ssp2_fs_2",
+	"ssp2_fs_3",
+	"ssp2_rxd_0",
+	"ssp2_rxd_1",
+	"ssp2_txd_0",
+	"ssp2_txd_1",
+	"ssp3_clk",
+	"ssp3_fs",
+	"ssp3_rxd",
+	"ssp3_txd",
+	"ssp4_clk",
+	"ssp4_fs",
+	"ssp4_rxd",
+	"ssp4_txd",
+	"ssp5_clk",
+	"ssp5_fs",
+	"ssp5_rxd",
+	"ssp5_txd",
+	"ssp6_clk",
+	"ssp6_fs",
+	"ssp6_rxd",
+	"ssp6_txd",
+	"stat_1",
+	"stat_2",
+	"sysclken",
+	"traceclk",
+	"tracedt00",
+	"tracedt01",
+	"tracedt02",
+	"tracedt03",
+	"tracedt04",
+	"tracedt05",
+	"tracedt06",
+	"tracedt07",
+	"tracedt08",
+	"tracedt09",
+	"tracedt10",
+	"tracedt11",
+	"tracedt12",
+	"tracedt13",
+	"tracedt14",
+	"tracedt15",
+	"txdata3g0",
+	"txpwrind",
+	"uartb1_ucts",
+	"uartb1_urts",
+	"uartb1_urxd",
+	"uartb1_utxd",
+	"uartb2_urxd",
+	"uartb2_utxd",
+	"uartb3_ucts",
+	"uartb3_urts",
+	"uartb3_urxd",
+	"uartb3_utxd",
+	"uartb4_ucts",
+	"uartb4_urts",
+	"uartb4_urxd",
+	"uartb4_utxd",
+	"vc_cam1_scl",
+	"vc_cam1_sda",
+	"vc_cam2_scl",
+	"vc_cam2_sda",
+	"vc_cam3_scl",
+	"vc_cam3_sda",
+};
+
+/* Every pin can implement all ALT1-ALT4 functions */
+#define BCM281XX_PIN_FUNCTION(fcn_name)			\
+{							\
+	.name = #fcn_name,				\
+	.groups = bcm281xx_alt_groups,			\
+	.ngroups = ARRAY_SIZE(bcm281xx_alt_groups),	\
+}
+
+static const struct bcm281xx_pin_function bcm281xx_functions[] = {
+	BCM281XX_PIN_FUNCTION(alt1),
+	BCM281XX_PIN_FUNCTION(alt2),
+	BCM281XX_PIN_FUNCTION(alt3),
+	BCM281XX_PIN_FUNCTION(alt4),
+};
+
+static struct bcm281xx_pinctrl_data bcm281xx_pinctrl = {
+	.pins = bcm281xx_pinctrl_pins,
+	.npins = ARRAY_SIZE(bcm281xx_pinctrl_pins),
+	.functions = bcm281xx_functions,
+	.nfunctions = ARRAY_SIZE(bcm281xx_functions),
+};
+
+static inline enum bcm281xx_pin_type pin_type_get(struct pinctrl_dev *pctldev,
+						  unsigned pin)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+
+	if (pin >= pdata->npins)
+		return BCM281XX_PIN_TYPE_UNKNOWN;
+
+	return *(enum bcm281xx_pin_type *)(pdata->pins[pin].drv_data);
+}
+
+#define BCM281XX_PIN_SHIFT(type, param) \
+	(BCM281XX_ ## type ## _PIN_REG_ ## param ## _SHIFT)
+
+#define BCM281XX_PIN_MASK(type, param) \
+	(BCM281XX_ ## type ## _PIN_REG_ ## param ## _MASK)
+
+/*
+ * This helper function is used to build up the value and mask used to write to
+ * a pin register, but does not actually write to the register.
+ */
+static inline void bcm281xx_pin_update(u32 *reg_val, u32 *reg_mask,
+				       u32 param_val, u32 param_shift,
+				       u32 param_mask)
+{
+	*reg_val &= ~param_mask;
+	*reg_val |= (param_val << param_shift) & param_mask;
+	*reg_mask |= param_mask;
+}
+
+static struct regmap_config bcm281xx_pinctrl_regmap_config = {
+	.reg_bits = 32,
+	.reg_stride = 4,
+	.val_bits = 32,
+	.max_register = BCM281XX_PIN_VC_CAM3_SDA,
+};
+
+static int bcm281xx_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+
+	return pdata->npins;
+}
+
+static const char *bcm281xx_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
+						   unsigned group)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+
+	return pdata->pins[group].name;
+}
+
+static int bcm281xx_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
+					   unsigned group,
+					   const unsigned **pins,
+					   unsigned *num_pins)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+
+	*pins = &pdata->pins[group].number;
+	*num_pins = 1;
+
+	return 0;
+}
+
+static void bcm281xx_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
+					  struct seq_file *s,
+					  unsigned offset)
+{
+	seq_printf(s, " %s", dev_name(pctldev->dev));
+}
+
+static struct pinctrl_ops bcm281xx_pinctrl_ops = {
+	.get_groups_count = bcm281xx_pinctrl_get_groups_count,
+	.get_group_name = bcm281xx_pinctrl_get_group_name,
+	.get_group_pins = bcm281xx_pinctrl_get_group_pins,
+	.pin_dbg_show = bcm281xx_pinctrl_pin_dbg_show,
+	.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
+	.dt_free_map = pinctrl_utils_dt_free_map,
+};
+
+static int bcm281xx_pinctrl_get_fcns_count(struct pinctrl_dev *pctldev)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+
+	return pdata->nfunctions;
+}
+
+static const char *bcm281xx_pinctrl_get_fcn_name(struct pinctrl_dev *pctldev,
+						 unsigned function)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+
+	return pdata->functions[function].name;
+}
+
+static int bcm281xx_pinctrl_get_fcn_groups(struct pinctrl_dev *pctldev,
+					   unsigned function,
+					   const char * const **groups,
+					   unsigned * const num_groups)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+
+	*groups = pdata->functions[function].groups;
+	*num_groups = pdata->functions[function].ngroups;
+
+	return 0;
+}
+
+static int bcm281xx_pinmux_set(struct pinctrl_dev *pctldev,
+			       unsigned function,
+			       unsigned group)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+	const struct bcm281xx_pin_function *f = &pdata->functions[function];
+	u32 offset = 4 * pdata->pins[group].number;
+	int rc = 0;
+
+	dev_dbg(pctldev->dev,
+		"%s(): Enable function %s (%d) of pin %s (%d) @offset 0x%x.\n",
+		__func__, f->name, function, pdata->pins[group].name,
+		pdata->pins[group].number, offset);
+
+	rc = regmap_update_bits(pdata->regmap, offset,
+		BCM281XX_PIN_REG_F_SEL_MASK,
+		function << BCM281XX_PIN_REG_F_SEL_SHIFT);
+	if (rc)
+		dev_err(pctldev->dev,
+			"Error updating register for pin %s (%d).\n",
+			pdata->pins[group].name, pdata->pins[group].number);
+
+	return rc;
+}
+
+static struct pinmux_ops bcm281xx_pinctrl_pinmux_ops = {
+	.get_functions_count = bcm281xx_pinctrl_get_fcns_count,
+	.get_function_name = bcm281xx_pinctrl_get_fcn_name,
+	.get_function_groups = bcm281xx_pinctrl_get_fcn_groups,
+	.set_mux = bcm281xx_pinmux_set,
+};
+
+static int bcm281xx_pinctrl_pin_config_get(struct pinctrl_dev *pctldev,
+					   unsigned pin,
+					   unsigned long *config)
+{
+	return -ENOTSUPP;
+}
+
+
+/* Goes through the configs and update register val/mask */
+static int bcm281xx_std_pin_update(struct pinctrl_dev *pctldev,
+				   unsigned pin,
+				   unsigned long *configs,
+				   unsigned num_configs,
+				   u32 *val,
+				   u32 *mask)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+	int i;
+	enum pin_config_param param;
+	u16 arg;
+
+	for (i = 0; i < num_configs; i++) {
+		param = pinconf_to_config_param(configs[i]);
+		arg = pinconf_to_config_argument(configs[i]);
+
+		switch (param) {
+		case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
+			arg = (arg >= 1 ? 1 : 0);
+			bcm281xx_pin_update(val, mask, arg,
+				BCM281XX_PIN_SHIFT(STD, HYST),
+				BCM281XX_PIN_MASK(STD, HYST));
+			break;
+		/*
+		 * The pin bias can only be one of pull-up, pull-down, or
+		 * disable.  The user does not need to specify a value for the
+		 * property, and the default value from pinconf-generic is
+		 * ignored.
+		 */
+		case PIN_CONFIG_BIAS_DISABLE:
+			bcm281xx_pin_update(val, mask, 0,
+				BCM281XX_PIN_SHIFT(STD, PULL_UP),
+				BCM281XX_PIN_MASK(STD, PULL_UP));
+			bcm281xx_pin_update(val, mask, 0,
+				BCM281XX_PIN_SHIFT(STD, PULL_DN),
+				BCM281XX_PIN_MASK(STD, PULL_DN));
+			break;
+
+		case PIN_CONFIG_BIAS_PULL_UP:
+			bcm281xx_pin_update(val, mask, 1,
+				BCM281XX_PIN_SHIFT(STD, PULL_UP),
+				BCM281XX_PIN_MASK(STD, PULL_UP));
+			bcm281xx_pin_update(val, mask, 0,
+				BCM281XX_PIN_SHIFT(STD, PULL_DN),
+				BCM281XX_PIN_MASK(STD, PULL_DN));
+			break;
+
+		case PIN_CONFIG_BIAS_PULL_DOWN:
+			bcm281xx_pin_update(val, mask, 0,
+				BCM281XX_PIN_SHIFT(STD, PULL_UP),
+				BCM281XX_PIN_MASK(STD, PULL_UP));
+			bcm281xx_pin_update(val, mask, 1,
+				BCM281XX_PIN_SHIFT(STD, PULL_DN),
+				BCM281XX_PIN_MASK(STD, PULL_DN));
+			break;
+
+		case PIN_CONFIG_SLEW_RATE:
+			arg = (arg >= 1 ? 1 : 0);
+			bcm281xx_pin_update(val, mask, arg,
+				BCM281XX_PIN_SHIFT(STD, SLEW),
+				BCM281XX_PIN_MASK(STD, SLEW));
+			break;
+
+		case PIN_CONFIG_INPUT_ENABLE:
+			/* inversed since register is for input _disable_ */
+			arg = (arg >= 1 ? 0 : 1);
+			bcm281xx_pin_update(val, mask, arg,
+				BCM281XX_PIN_SHIFT(STD, INPUT_DIS),
+				BCM281XX_PIN_MASK(STD, INPUT_DIS));
+			break;
+
+		case PIN_CONFIG_DRIVE_STRENGTH:
+			/* Valid range is 2-16 mA, even numbers only */
+			if ((arg < 2) || (arg > 16) || (arg % 2)) {
+				dev_err(pctldev->dev,
+					"Invalid Drive Strength value (%d) for "
+					"pin %s (%d). Valid values are "
+					"(2..16) mA, even numbers only.\n",
+					arg, pdata->pins[pin].name, pin);
+				return -EINVAL;
+			}
+			bcm281xx_pin_update(val, mask, (arg/2)-1,
+				BCM281XX_PIN_SHIFT(STD, DRV_STR),
+				BCM281XX_PIN_MASK(STD, DRV_STR));
+			break;
+
+		default:
+			dev_err(pctldev->dev,
+				"Unrecognized pin config %d for pin %s (%d).\n",
+				param, pdata->pins[pin].name, pin);
+			return -EINVAL;
+
+		} /* switch config */
+	} /* for each config */
+
+	return 0;
+}
+
+/*
+ * The pull-up strength for an I2C pin is represented by bits 4-6 in the
+ * register with the following mapping:
+ *   0b000: No pull-up
+ *   0b001: 1200 Ohm
+ *   0b010: 1800 Ohm
+ *   0b011: 720 Ohm
+ *   0b100: 2700 Ohm
+ *   0b101: 831 Ohm
+ *   0b110: 1080 Ohm
+ *   0b111: 568 Ohm
+ * This array maps pull-up strength in Ohms to register values (1+index).
+ */
+static const u16 bcm281xx_pullup_map[] = {
+	1200, 1800, 720, 2700, 831, 1080, 568
+};
+
+/* Goes through the configs and update register val/mask */
+static int bcm281xx_i2c_pin_update(struct pinctrl_dev *pctldev,
+				   unsigned pin,
+				   unsigned long *configs,
+				   unsigned num_configs,
+				   u32 *val,
+				   u32 *mask)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+	int i, j;
+	enum pin_config_param param;
+	u16 arg;
+
+	for (i = 0; i < num_configs; i++) {
+		param = pinconf_to_config_param(configs[i]);
+		arg = pinconf_to_config_argument(configs[i]);
+
+		switch (param) {
+		case PIN_CONFIG_BIAS_PULL_UP:
+			for (j = 0; j < ARRAY_SIZE(bcm281xx_pullup_map); j++)
+				if (bcm281xx_pullup_map[j] == arg)
+					break;
+
+			if (j == ARRAY_SIZE(bcm281xx_pullup_map)) {
+				dev_err(pctldev->dev,
+					"Invalid pull-up value (%d) for pin %s "
+					"(%d). Valid values are 568, 720, 831, "
+					"1080, 1200, 1800, 2700 Ohms.\n",
+					arg, pdata->pins[pin].name, pin);
+				return -EINVAL;
+			}
+
+			bcm281xx_pin_update(val, mask, j+1,
+				BCM281XX_PIN_SHIFT(I2C, PULL_UP_STR),
+				BCM281XX_PIN_MASK(I2C, PULL_UP_STR));
+			break;
+
+		case PIN_CONFIG_BIAS_DISABLE:
+			bcm281xx_pin_update(val, mask, 0,
+				BCM281XX_PIN_SHIFT(I2C, PULL_UP_STR),
+				BCM281XX_PIN_MASK(I2C, PULL_UP_STR));
+			break;
+
+		case PIN_CONFIG_SLEW_RATE:
+			arg = (arg >= 1 ? 1 : 0);
+			bcm281xx_pin_update(val, mask, arg,
+				BCM281XX_PIN_SHIFT(I2C, SLEW),
+				BCM281XX_PIN_MASK(I2C, SLEW));
+			break;
+
+		case PIN_CONFIG_INPUT_ENABLE:
+			/* inversed since register is for input _disable_ */
+			arg = (arg >= 1 ? 0 : 1);
+			bcm281xx_pin_update(val, mask, arg,
+				BCM281XX_PIN_SHIFT(I2C, INPUT_DIS),
+				BCM281XX_PIN_MASK(I2C, INPUT_DIS));
+			break;
+
+		default:
+			dev_err(pctldev->dev,
+				"Unrecognized pin config %d for pin %s (%d).\n",
+				param, pdata->pins[pin].name, pin);
+			return -EINVAL;
+
+		} /* switch config */
+	} /* for each config */
+
+	return 0;
+}
+
+/* Goes through the configs and update register val/mask */
+static int bcm281xx_hdmi_pin_update(struct pinctrl_dev *pctldev,
+				    unsigned pin,
+				    unsigned long *configs,
+				    unsigned num_configs,
+				    u32 *val,
+				    u32 *mask)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+	int i;
+	enum pin_config_param param;
+	u16 arg;
+
+	for (i = 0; i < num_configs; i++) {
+		param = pinconf_to_config_param(configs[i]);
+		arg = pinconf_to_config_argument(configs[i]);
+
+		switch (param) {
+		case PIN_CONFIG_SLEW_RATE:
+			arg = (arg >= 1 ? 1 : 0);
+			bcm281xx_pin_update(val, mask, arg,
+				BCM281XX_PIN_SHIFT(HDMI, MODE),
+				BCM281XX_PIN_MASK(HDMI, MODE));
+			break;
+
+		case PIN_CONFIG_INPUT_ENABLE:
+			/* inversed since register is for input _disable_ */
+			arg = (arg >= 1 ? 0 : 1);
+			bcm281xx_pin_update(val, mask, arg,
+				BCM281XX_PIN_SHIFT(HDMI, INPUT_DIS),
+				BCM281XX_PIN_MASK(HDMI, INPUT_DIS));
+			break;
+
+		default:
+			dev_err(pctldev->dev,
+				"Unrecognized pin config %d for pin %s (%d).\n",
+				param, pdata->pins[pin].name, pin);
+			return -EINVAL;
+
+		} /* switch config */
+	} /* for each config */
+
+	return 0;
+}
+
+static int bcm281xx_pinctrl_pin_config_set(struct pinctrl_dev *pctldev,
+					   unsigned pin,
+					   unsigned long *configs,
+					   unsigned num_configs)
+{
+	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
+	enum bcm281xx_pin_type pin_type;
+	u32 offset = 4 * pin;
+	u32 cfg_val, cfg_mask;
+	int rc;
+
+	cfg_val = 0;
+	cfg_mask = 0;
+	pin_type = pin_type_get(pctldev, pin);
+
+	/* Different pins have different configuration options */
+	switch (pin_type) {
+	case BCM281XX_PIN_TYPE_STD:
+		rc = bcm281xx_std_pin_update(pctldev, pin, configs,
+			num_configs, &cfg_val, &cfg_mask);
+		break;
+
+	case BCM281XX_PIN_TYPE_I2C:
+		rc = bcm281xx_i2c_pin_update(pctldev, pin, configs,
+			num_configs, &cfg_val, &cfg_mask);
+		break;
+
+	case BCM281XX_PIN_TYPE_HDMI:
+		rc = bcm281xx_hdmi_pin_update(pctldev, pin, configs,
+			num_configs, &cfg_val, &cfg_mask);
+		break;
+
+	default:
+		dev_err(pctldev->dev, "Unknown pin type for pin %s (%d).\n",
+			pdata->pins[pin].name, pin);
+		return -EINVAL;
+
+	} /* switch pin type */
+
+	if (rc)
+		return rc;
+
+	dev_dbg(pctldev->dev,
+		"%s(): Set pin %s (%d) with config 0x%x, mask 0x%x\n",
+		__func__, pdata->pins[pin].name, pin, cfg_val, cfg_mask);
+
+	rc = regmap_update_bits(pdata->regmap, offset, cfg_mask, cfg_val);
+	if (rc) {
+		dev_err(pctldev->dev,
+			"Error updating register for pin %s (%d).\n",
+			pdata->pins[pin].name, pin);
+		return rc;
+	}
+
+	return 0;
+}
+
+static struct pinconf_ops bcm281xx_pinctrl_pinconf_ops = {
+	.pin_config_get = bcm281xx_pinctrl_pin_config_get,
+	.pin_config_set = bcm281xx_pinctrl_pin_config_set,
+};
+
+static struct pinctrl_desc bcm281xx_pinctrl_desc = {
+	/* name, pins, npins members initialized in probe function */
+	.pctlops = &bcm281xx_pinctrl_ops,
+	.pmxops = &bcm281xx_pinctrl_pinmux_ops,
+	.confops = &bcm281xx_pinctrl_pinconf_ops,
+	.owner = THIS_MODULE,
+};
+
+static int __init bcm281xx_pinctrl_probe(struct platform_device *pdev)
+{
+	struct bcm281xx_pinctrl_data *pdata = &bcm281xx_pinctrl;
+	struct resource *res;
+	struct pinctrl_dev *pctl;
+
+	/* So far We can assume there is only 1 bank of registers */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	pdata->reg_base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(pdata->reg_base)) {
+		dev_err(&pdev->dev, "Failed to ioremap MEM resource\n");
+		return -ENODEV;
+	}
+
+	/* Initialize the dynamic part of pinctrl_desc */
+	pdata->regmap = devm_regmap_init_mmio(&pdev->dev, pdata->reg_base,
+		&bcm281xx_pinctrl_regmap_config);
+	if (IS_ERR(pdata->regmap)) {
+		dev_err(&pdev->dev, "Regmap MMIO init failed.\n");
+		return -ENODEV;
+	}
+
+	bcm281xx_pinctrl_desc.name = dev_name(&pdev->dev);
+	bcm281xx_pinctrl_desc.pins = bcm281xx_pinctrl.pins;
+	bcm281xx_pinctrl_desc.npins = bcm281xx_pinctrl.npins;
+
+	pctl = pinctrl_register(&bcm281xx_pinctrl_desc,
+				&pdev->dev,
+				pdata);
+	if (!pctl) {
+		dev_err(&pdev->dev, "Failed to register pinctrl\n");
+		return -ENODEV;
+	}
+
+	platform_set_drvdata(pdev, pdata);
+
+	return 0;
+}
+
+static struct of_device_id bcm281xx_pinctrl_of_match[] = {
+	{ .compatible = "brcm,bcm11351-pinctrl", },
+	{ },
+};
+
+static struct platform_driver bcm281xx_pinctrl_driver = {
+	.driver = {
+		.name = "bcm281xx-pinctrl",
+		.of_match_table = bcm281xx_pinctrl_of_match,
+	},
+};
+
+module_platform_driver_probe(bcm281xx_pinctrl_driver, bcm281xx_pinctrl_probe);
+
+MODULE_AUTHOR("Broadcom Corporation <bcm-kernel-feedback-list@broadcom.com>");
+MODULE_AUTHOR("Sherman Yin <syin@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom BCM281xx pinctrl driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/pinctrl/bcm/pinctrl-bcm2835.c b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
new file mode 100644
index 0000000..9aa8a3f
--- /dev/null
+++ b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
@@ -0,0 +1,1072 @@
+/*
+ * Driver for Broadcom BCM2835 GPIO unit (pinctrl + GPIO)
+ *
+ * Copyright (C) 2012 Chris Boot, Simon Arlott, Stephen Warren
+ *
+ * This driver is inspired by:
+ * pinctrl-nomadik.c, please see original file for copyright information
+ * pinctrl-tegra.c, please see original file for copyright information
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/bitmap.h>
+#include <linux/bug.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/irqdesc.h>
+#include <linux/irqdomain.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/pinctrl/machine.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/platform_device.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+
+#define MODULE_NAME "pinctrl-bcm2835"
+#define BCM2835_NUM_GPIOS 54
+#define BCM2835_NUM_BANKS 2
+
+#define BCM2835_PIN_BITMAP_SZ \
+	DIV_ROUND_UP(BCM2835_NUM_GPIOS, sizeof(unsigned long) * 8)
+
+/* GPIO register offsets */
+#define GPFSEL0		0x0	/* Function Select */
+#define GPSET0		0x1c	/* Pin Output Set */
+#define GPCLR0		0x28	/* Pin Output Clear */
+#define GPLEV0		0x34	/* Pin Level */
+#define GPEDS0		0x40	/* Pin Event Detect Status */
+#define GPREN0		0x4c	/* Pin Rising Edge Detect Enable */
+#define GPFEN0		0x58	/* Pin Falling Edge Detect Enable */
+#define GPHEN0		0x64	/* Pin High Detect Enable */
+#define GPLEN0		0x70	/* Pin Low Detect Enable */
+#define GPAREN0		0x7c	/* Pin Async Rising Edge Detect */
+#define GPAFEN0		0x88	/* Pin Async Falling Edge Detect */
+#define GPPUD		0x94	/* Pin Pull-up/down Enable */
+#define GPPUDCLK0	0x98	/* Pin Pull-up/down Enable Clock */
+
+#define FSEL_REG(p)		(GPFSEL0 + (((p) / 10) * 4))
+#define FSEL_SHIFT(p)		(((p) % 10) * 3)
+#define GPIO_REG_OFFSET(p)	((p) / 32)
+#define GPIO_REG_SHIFT(p)	((p) % 32)
+
+enum bcm2835_pinconf_param {
+	/* argument: bcm2835_pinconf_pull */
+	BCM2835_PINCONF_PARAM_PULL,
+};
+
+enum bcm2835_pinconf_pull {
+	BCM2835_PINCONFIG_PULL_NONE,
+	BCM2835_PINCONFIG_PULL_DOWN,
+	BCM2835_PINCONFIG_PULL_UP,
+};
+
+#define BCM2835_PINCONF_PACK(_param_, _arg_) ((_param_) << 16 | (_arg_))
+#define BCM2835_PINCONF_UNPACK_PARAM(_conf_) ((_conf_) >> 16)
+#define BCM2835_PINCONF_UNPACK_ARG(_conf_) ((_conf_) & 0xffff)
+
+struct bcm2835_gpio_irqdata {
+	struct bcm2835_pinctrl *pc;
+	int bank;
+};
+
+struct bcm2835_pinctrl {
+	struct device *dev;
+	void __iomem *base;
+	int irq[BCM2835_NUM_BANKS];
+
+	/* note: locking assumes each bank will have its own unsigned long */
+	unsigned long enabled_irq_map[BCM2835_NUM_BANKS];
+	unsigned int irq_type[BCM2835_NUM_GPIOS];
+
+	struct pinctrl_dev *pctl_dev;
+	struct irq_domain *irq_domain;
+	struct gpio_chip gpio_chip;
+	struct pinctrl_gpio_range gpio_range;
+
+	struct bcm2835_gpio_irqdata irq_data[BCM2835_NUM_BANKS];
+	spinlock_t irq_lock[BCM2835_NUM_BANKS];
+};
+
+static struct lock_class_key gpio_lock_class;
+
+/* pins are just named GPIO0..GPIO53 */
+#define BCM2835_GPIO_PIN(a) PINCTRL_PIN(a, "gpio" #a)
+static struct pinctrl_pin_desc bcm2835_gpio_pins[] = {
+	BCM2835_GPIO_PIN(0),
+	BCM2835_GPIO_PIN(1),
+	BCM2835_GPIO_PIN(2),
+	BCM2835_GPIO_PIN(3),
+	BCM2835_GPIO_PIN(4),
+	BCM2835_GPIO_PIN(5),
+	BCM2835_GPIO_PIN(6),
+	BCM2835_GPIO_PIN(7),
+	BCM2835_GPIO_PIN(8),
+	BCM2835_GPIO_PIN(9),
+	BCM2835_GPIO_PIN(10),
+	BCM2835_GPIO_PIN(11),
+	BCM2835_GPIO_PIN(12),
+	BCM2835_GPIO_PIN(13),
+	BCM2835_GPIO_PIN(14),
+	BCM2835_GPIO_PIN(15),
+	BCM2835_GPIO_PIN(16),
+	BCM2835_GPIO_PIN(17),
+	BCM2835_GPIO_PIN(18),
+	BCM2835_GPIO_PIN(19),
+	BCM2835_GPIO_PIN(20),
+	BCM2835_GPIO_PIN(21),
+	BCM2835_GPIO_PIN(22),
+	BCM2835_GPIO_PIN(23),
+	BCM2835_GPIO_PIN(24),
+	BCM2835_GPIO_PIN(25),
+	BCM2835_GPIO_PIN(26),
+	BCM2835_GPIO_PIN(27),
+	BCM2835_GPIO_PIN(28),
+	BCM2835_GPIO_PIN(29),
+	BCM2835_GPIO_PIN(30),
+	BCM2835_GPIO_PIN(31),
+	BCM2835_GPIO_PIN(32),
+	BCM2835_GPIO_PIN(33),
+	BCM2835_GPIO_PIN(34),
+	BCM2835_GPIO_PIN(35),
+	BCM2835_GPIO_PIN(36),
+	BCM2835_GPIO_PIN(37),
+	BCM2835_GPIO_PIN(38),
+	BCM2835_GPIO_PIN(39),
+	BCM2835_GPIO_PIN(40),
+	BCM2835_GPIO_PIN(41),
+	BCM2835_GPIO_PIN(42),
+	BCM2835_GPIO_PIN(43),
+	BCM2835_GPIO_PIN(44),
+	BCM2835_GPIO_PIN(45),
+	BCM2835_GPIO_PIN(46),
+	BCM2835_GPIO_PIN(47),
+	BCM2835_GPIO_PIN(48),
+	BCM2835_GPIO_PIN(49),
+	BCM2835_GPIO_PIN(50),
+	BCM2835_GPIO_PIN(51),
+	BCM2835_GPIO_PIN(52),
+	BCM2835_GPIO_PIN(53),
+};
+
+/* one pin per group */
+static const char * const bcm2835_gpio_groups[] = {
+	"gpio0",
+	"gpio1",
+	"gpio2",
+	"gpio3",
+	"gpio4",
+	"gpio5",
+	"gpio6",
+	"gpio7",
+	"gpio8",
+	"gpio9",
+	"gpio10",
+	"gpio11",
+	"gpio12",
+	"gpio13",
+	"gpio14",
+	"gpio15",
+	"gpio16",
+	"gpio17",
+	"gpio18",
+	"gpio19",
+	"gpio20",
+	"gpio21",
+	"gpio22",
+	"gpio23",
+	"gpio24",
+	"gpio25",
+	"gpio26",
+	"gpio27",
+	"gpio28",
+	"gpio29",
+	"gpio30",
+	"gpio31",
+	"gpio32",
+	"gpio33",
+	"gpio34",
+	"gpio35",
+	"gpio36",
+	"gpio37",
+	"gpio38",
+	"gpio39",
+	"gpio40",
+	"gpio41",
+	"gpio42",
+	"gpio43",
+	"gpio44",
+	"gpio45",
+	"gpio46",
+	"gpio47",
+	"gpio48",
+	"gpio49",
+	"gpio50",
+	"gpio51",
+	"gpio52",
+	"gpio53",
+};
+
+enum bcm2835_fsel {
+	BCM2835_FSEL_GPIO_IN = 0,
+	BCM2835_FSEL_GPIO_OUT = 1,
+	BCM2835_FSEL_ALT0 = 4,
+	BCM2835_FSEL_ALT1 = 5,
+	BCM2835_FSEL_ALT2 = 6,
+	BCM2835_FSEL_ALT3 = 7,
+	BCM2835_FSEL_ALT4 = 3,
+	BCM2835_FSEL_ALT5 = 2,
+	BCM2835_FSEL_COUNT = 8,
+	BCM2835_FSEL_MASK = 0x7,
+};
+
+static const char * const bcm2835_functions[BCM2835_FSEL_COUNT] = {
+	[BCM2835_FSEL_GPIO_IN] = "gpio_in",
+	[BCM2835_FSEL_GPIO_OUT] = "gpio_out",
+	[BCM2835_FSEL_ALT0] = "alt0",
+	[BCM2835_FSEL_ALT1] = "alt1",
+	[BCM2835_FSEL_ALT2] = "alt2",
+	[BCM2835_FSEL_ALT3] = "alt3",
+	[BCM2835_FSEL_ALT4] = "alt4",
+	[BCM2835_FSEL_ALT5] = "alt5",
+};
+
+static const char * const irq_type_names[] = {
+	[IRQ_TYPE_NONE] = "none",
+	[IRQ_TYPE_EDGE_RISING] = "edge-rising",
+	[IRQ_TYPE_EDGE_FALLING] = "edge-falling",
+	[IRQ_TYPE_EDGE_BOTH] = "edge-both",
+	[IRQ_TYPE_LEVEL_HIGH] = "level-high",
+	[IRQ_TYPE_LEVEL_LOW] = "level-low",
+};
+
+static inline u32 bcm2835_gpio_rd(struct bcm2835_pinctrl *pc, unsigned reg)
+{
+	return readl(pc->base + reg);
+}
+
+static inline void bcm2835_gpio_wr(struct bcm2835_pinctrl *pc, unsigned reg,
+		u32 val)
+{
+	writel(val, pc->base + reg);
+}
+
+static inline int bcm2835_gpio_get_bit(struct bcm2835_pinctrl *pc, unsigned reg,
+		unsigned bit)
+{
+	reg += GPIO_REG_OFFSET(bit) * 4;
+	return (bcm2835_gpio_rd(pc, reg) >> GPIO_REG_SHIFT(bit)) & 1;
+}
+
+/* note NOT a read/modify/write cycle */
+static inline void bcm2835_gpio_set_bit(struct bcm2835_pinctrl *pc,
+		unsigned reg, unsigned bit)
+{
+	reg += GPIO_REG_OFFSET(bit) * 4;
+	bcm2835_gpio_wr(pc, reg, BIT(GPIO_REG_SHIFT(bit)));
+}
+
+static inline enum bcm2835_fsel bcm2835_pinctrl_fsel_get(
+		struct bcm2835_pinctrl *pc, unsigned pin)
+{
+	u32 val = bcm2835_gpio_rd(pc, FSEL_REG(pin));
+	enum bcm2835_fsel status = (val >> FSEL_SHIFT(pin)) & BCM2835_FSEL_MASK;
+
+	dev_dbg(pc->dev, "get %08x (%u => %s)\n", val, pin,
+			bcm2835_functions[status]);
+
+	return status;
+}
+
+static inline void bcm2835_pinctrl_fsel_set(
+		struct bcm2835_pinctrl *pc, unsigned pin,
+		enum bcm2835_fsel fsel)
+{
+	u32 val = bcm2835_gpio_rd(pc, FSEL_REG(pin));
+	enum bcm2835_fsel cur = (val >> FSEL_SHIFT(pin)) & BCM2835_FSEL_MASK;
+
+	dev_dbg(pc->dev, "read %08x (%u => %s)\n", val, pin,
+			bcm2835_functions[cur]);
+
+	if (cur == fsel)
+		return;
+
+	if (cur != BCM2835_FSEL_GPIO_IN && fsel != BCM2835_FSEL_GPIO_IN) {
+		/* always transition through GPIO_IN */
+		val &= ~(BCM2835_FSEL_MASK << FSEL_SHIFT(pin));
+		val |= BCM2835_FSEL_GPIO_IN << FSEL_SHIFT(pin);
+
+		dev_dbg(pc->dev, "trans %08x (%u <= %s)\n", val, pin,
+				bcm2835_functions[BCM2835_FSEL_GPIO_IN]);
+		bcm2835_gpio_wr(pc, FSEL_REG(pin), val);
+	}
+
+	val &= ~(BCM2835_FSEL_MASK << FSEL_SHIFT(pin));
+	val |= fsel << FSEL_SHIFT(pin);
+
+	dev_dbg(pc->dev, "write %08x (%u <= %s)\n", val, pin,
+			bcm2835_functions[fsel]);
+	bcm2835_gpio_wr(pc, FSEL_REG(pin), val);
+}
+
+static int bcm2835_gpio_request(struct gpio_chip *chip, unsigned offset)
+{
+	return pinctrl_request_gpio(chip->base + offset);
+}
+
+static void bcm2835_gpio_free(struct gpio_chip *chip, unsigned offset)
+{
+	pinctrl_free_gpio(chip->base + offset);
+}
+
+static int bcm2835_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+	return pinctrl_gpio_direction_input(chip->base + offset);
+}
+
+static int bcm2835_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+	struct bcm2835_pinctrl *pc = dev_get_drvdata(chip->dev);
+
+	return bcm2835_gpio_get_bit(pc, GPLEV0, offset);
+}
+
+static int bcm2835_gpio_direction_output(struct gpio_chip *chip,
+		unsigned offset, int value)
+{
+	return pinctrl_gpio_direction_output(chip->base + offset);
+}
+
+static void bcm2835_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+	struct bcm2835_pinctrl *pc = dev_get_drvdata(chip->dev);
+
+	bcm2835_gpio_set_bit(pc, value ? GPSET0 : GPCLR0, offset);
+}
+
+static int bcm2835_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+	struct bcm2835_pinctrl *pc = dev_get_drvdata(chip->dev);
+
+	return irq_linear_revmap(pc->irq_domain, offset);
+}
+
+static struct gpio_chip bcm2835_gpio_chip = {
+	.label = MODULE_NAME,
+	.owner = THIS_MODULE,
+	.request = bcm2835_gpio_request,
+	.free = bcm2835_gpio_free,
+	.direction_input = bcm2835_gpio_direction_input,
+	.direction_output = bcm2835_gpio_direction_output,
+	.get = bcm2835_gpio_get,
+	.set = bcm2835_gpio_set,
+	.to_irq = bcm2835_gpio_to_irq,
+	.base = -1,
+	.ngpio = BCM2835_NUM_GPIOS,
+	.can_sleep = false,
+};
+
+static irqreturn_t bcm2835_gpio_irq_handler(int irq, void *dev_id)
+{
+	struct bcm2835_gpio_irqdata *irqdata = dev_id;
+	struct bcm2835_pinctrl *pc = irqdata->pc;
+	int bank = irqdata->bank;
+	unsigned long events;
+	unsigned offset;
+	unsigned gpio;
+	unsigned int type;
+
+	events = bcm2835_gpio_rd(pc, GPEDS0 + bank * 4);
+	events &= pc->enabled_irq_map[bank];
+	for_each_set_bit(offset, &events, 32) {
+		gpio = (32 * bank) + offset;
+		type = pc->irq_type[gpio];
+
+		/* ack edge triggered IRQs immediately */
+		if (!(type & IRQ_TYPE_LEVEL_MASK))
+			bcm2835_gpio_set_bit(pc, GPEDS0, gpio);
+
+		generic_handle_irq(irq_linear_revmap(pc->irq_domain, gpio));
+
+		/* ack level triggered IRQ after handling them */
+		if (type & IRQ_TYPE_LEVEL_MASK)
+			bcm2835_gpio_set_bit(pc, GPEDS0, gpio);
+	}
+	return events ? IRQ_HANDLED : IRQ_NONE;
+}
+
+static inline void __bcm2835_gpio_irq_config(struct bcm2835_pinctrl *pc,
+	unsigned reg, unsigned offset, bool enable)
+{
+	u32 value;
+	reg += GPIO_REG_OFFSET(offset) * 4;
+	value = bcm2835_gpio_rd(pc, reg);
+	if (enable)
+		value |= BIT(GPIO_REG_SHIFT(offset));
+	else
+		value &= ~(BIT(GPIO_REG_SHIFT(offset)));
+	bcm2835_gpio_wr(pc, reg, value);
+}
+
+/* fast path for IRQ handler */
+static void bcm2835_gpio_irq_config(struct bcm2835_pinctrl *pc,
+	unsigned offset, bool enable)
+{
+	switch (pc->irq_type[offset]) {
+	case IRQ_TYPE_EDGE_RISING:
+		__bcm2835_gpio_irq_config(pc, GPREN0, offset, enable);
+		break;
+
+	case IRQ_TYPE_EDGE_FALLING:
+		__bcm2835_gpio_irq_config(pc, GPFEN0, offset, enable);
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		__bcm2835_gpio_irq_config(pc, GPREN0, offset, enable);
+		__bcm2835_gpio_irq_config(pc, GPFEN0, offset, enable);
+		break;
+
+	case IRQ_TYPE_LEVEL_HIGH:
+		__bcm2835_gpio_irq_config(pc, GPHEN0, offset, enable);
+		break;
+
+	case IRQ_TYPE_LEVEL_LOW:
+		__bcm2835_gpio_irq_config(pc, GPLEN0, offset, enable);
+		break;
+	}
+}
+
+static void bcm2835_gpio_irq_enable(struct irq_data *data)
+{
+	struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data);
+	unsigned gpio = irqd_to_hwirq(data);
+	unsigned offset = GPIO_REG_SHIFT(gpio);
+	unsigned bank = GPIO_REG_OFFSET(gpio);
+	unsigned long flags;
+
+	spin_lock_irqsave(&pc->irq_lock[bank], flags);
+	set_bit(offset, &pc->enabled_irq_map[bank]);
+	bcm2835_gpio_irq_config(pc, gpio, true);
+	spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
+}
+
+static void bcm2835_gpio_irq_disable(struct irq_data *data)
+{
+	struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data);
+	unsigned gpio = irqd_to_hwirq(data);
+	unsigned offset = GPIO_REG_SHIFT(gpio);
+	unsigned bank = GPIO_REG_OFFSET(gpio);
+	unsigned long flags;
+
+	spin_lock_irqsave(&pc->irq_lock[bank], flags);
+	bcm2835_gpio_irq_config(pc, gpio, false);
+	clear_bit(offset, &pc->enabled_irq_map[bank]);
+	spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
+}
+
+static int __bcm2835_gpio_irq_set_type_disabled(struct bcm2835_pinctrl *pc,
+	unsigned offset, unsigned int type)
+{
+	switch (type) {
+	case IRQ_TYPE_NONE:
+	case IRQ_TYPE_EDGE_RISING:
+	case IRQ_TYPE_EDGE_FALLING:
+	case IRQ_TYPE_EDGE_BOTH:
+	case IRQ_TYPE_LEVEL_HIGH:
+	case IRQ_TYPE_LEVEL_LOW:
+		pc->irq_type[offset] = type;
+		break;
+
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+/* slower path for reconfiguring IRQ type */
+static int __bcm2835_gpio_irq_set_type_enabled(struct bcm2835_pinctrl *pc,
+	unsigned offset, unsigned int type)
+{
+	switch (type) {
+	case IRQ_TYPE_NONE:
+		if (pc->irq_type[offset] != type) {
+			bcm2835_gpio_irq_config(pc, offset, false);
+			pc->irq_type[offset] = type;
+		}
+		break;
+
+	case IRQ_TYPE_EDGE_RISING:
+		if (pc->irq_type[offset] == IRQ_TYPE_EDGE_BOTH) {
+			/* RISING already enabled, disable FALLING */
+			pc->irq_type[offset] = IRQ_TYPE_EDGE_FALLING;
+			bcm2835_gpio_irq_config(pc, offset, false);
+			pc->irq_type[offset] = type;
+		} else if (pc->irq_type[offset] != type) {
+			bcm2835_gpio_irq_config(pc, offset, false);
+			pc->irq_type[offset] = type;
+			bcm2835_gpio_irq_config(pc, offset, true);
+		}
+		break;
+
+	case IRQ_TYPE_EDGE_FALLING:
+		if (pc->irq_type[offset] == IRQ_TYPE_EDGE_BOTH) {
+			/* FALLING already enabled, disable RISING */
+			pc->irq_type[offset] = IRQ_TYPE_EDGE_RISING;
+			bcm2835_gpio_irq_config(pc, offset, false);
+			pc->irq_type[offset] = type;
+		} else if (pc->irq_type[offset] != type) {
+			bcm2835_gpio_irq_config(pc, offset, false);
+			pc->irq_type[offset] = type;
+			bcm2835_gpio_irq_config(pc, offset, true);
+		}
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		if (pc->irq_type[offset] == IRQ_TYPE_EDGE_RISING) {
+			/* RISING already enabled, enable FALLING too */
+			pc->irq_type[offset] = IRQ_TYPE_EDGE_FALLING;
+			bcm2835_gpio_irq_config(pc, offset, true);
+			pc->irq_type[offset] = type;
+		} else if (pc->irq_type[offset] == IRQ_TYPE_EDGE_FALLING) {
+			/* FALLING already enabled, enable RISING too */
+			pc->irq_type[offset] = IRQ_TYPE_EDGE_RISING;
+			bcm2835_gpio_irq_config(pc, offset, true);
+			pc->irq_type[offset] = type;
+		} else if (pc->irq_type[offset] != type) {
+			bcm2835_gpio_irq_config(pc, offset, false);
+			pc->irq_type[offset] = type;
+			bcm2835_gpio_irq_config(pc, offset, true);
+		}
+		break;
+
+	case IRQ_TYPE_LEVEL_HIGH:
+	case IRQ_TYPE_LEVEL_LOW:
+		if (pc->irq_type[offset] != type) {
+			bcm2835_gpio_irq_config(pc, offset, false);
+			pc->irq_type[offset] = type;
+			bcm2835_gpio_irq_config(pc, offset, true);
+		}
+		break;
+
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int bcm2835_gpio_irq_set_type(struct irq_data *data, unsigned int type)
+{
+	struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data);
+	unsigned gpio = irqd_to_hwirq(data);
+	unsigned offset = GPIO_REG_SHIFT(gpio);
+	unsigned bank = GPIO_REG_OFFSET(gpio);
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&pc->irq_lock[bank], flags);
+
+	if (test_bit(offset, &pc->enabled_irq_map[bank]))
+		ret = __bcm2835_gpio_irq_set_type_enabled(pc, gpio, type);
+	else
+		ret = __bcm2835_gpio_irq_set_type_disabled(pc, gpio, type);
+
+	spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
+
+	return ret;
+}
+
+static struct irq_chip bcm2835_gpio_irq_chip = {
+	.name = MODULE_NAME,
+	.irq_enable = bcm2835_gpio_irq_enable,
+	.irq_disable = bcm2835_gpio_irq_disable,
+	.irq_set_type = bcm2835_gpio_irq_set_type,
+};
+
+static int bcm2835_pctl_get_groups_count(struct pinctrl_dev *pctldev)
+{
+	return ARRAY_SIZE(bcm2835_gpio_groups);
+}
+
+static const char *bcm2835_pctl_get_group_name(struct pinctrl_dev *pctldev,
+		unsigned selector)
+{
+	return bcm2835_gpio_groups[selector];
+}
+
+static int bcm2835_pctl_get_group_pins(struct pinctrl_dev *pctldev,
+		unsigned selector,
+		const unsigned **pins,
+		unsigned *num_pins)
+{
+	*pins = &bcm2835_gpio_pins[selector].number;
+	*num_pins = 1;
+
+	return 0;
+}
+
+static void bcm2835_pctl_pin_dbg_show(struct pinctrl_dev *pctldev,
+		struct seq_file *s,
+		unsigned offset)
+{
+	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
+	enum bcm2835_fsel fsel = bcm2835_pinctrl_fsel_get(pc, offset);
+	const char *fname = bcm2835_functions[fsel];
+	int value = bcm2835_gpio_get_bit(pc, GPLEV0, offset);
+	int irq = irq_find_mapping(pc->irq_domain, offset);
+
+	seq_printf(s, "function %s in %s; irq %d (%s)",
+		fname, value ? "hi" : "lo",
+		irq, irq_type_names[pc->irq_type[offset]]);
+}
+
+static void bcm2835_pctl_dt_free_map(struct pinctrl_dev *pctldev,
+		struct pinctrl_map *maps, unsigned num_maps)
+{
+	int i;
+
+	for (i = 0; i < num_maps; i++)
+		if (maps[i].type == PIN_MAP_TYPE_CONFIGS_PIN)
+			kfree(maps[i].data.configs.configs);
+
+	kfree(maps);
+}
+
+static int bcm2835_pctl_dt_node_to_map_func(struct bcm2835_pinctrl *pc,
+		struct device_node *np, u32 pin, u32 fnum,
+		struct pinctrl_map **maps)
+{
+	struct pinctrl_map *map = *maps;
+
+	if (fnum >= ARRAY_SIZE(bcm2835_functions)) {
+		dev_err(pc->dev, "%s: invalid brcm,function %d\n",
+			of_node_full_name(np), fnum);
+		return -EINVAL;
+	}
+
+	map->type = PIN_MAP_TYPE_MUX_GROUP;
+	map->data.mux.group = bcm2835_gpio_groups[pin];
+	map->data.mux.function = bcm2835_functions[fnum];
+	(*maps)++;
+
+	return 0;
+}
+
+static int bcm2835_pctl_dt_node_to_map_pull(struct bcm2835_pinctrl *pc,
+		struct device_node *np, u32 pin, u32 pull,
+		struct pinctrl_map **maps)
+{
+	struct pinctrl_map *map = *maps;
+	unsigned long *configs;
+
+	if (pull > 2) {
+		dev_err(pc->dev, "%s: invalid brcm,pull %d\n",
+			of_node_full_name(np), pull);
+		return -EINVAL;
+	}
+
+	configs = kzalloc(sizeof(*configs), GFP_KERNEL);
+	if (!configs)
+		return -ENOMEM;
+	configs[0] = BCM2835_PINCONF_PACK(BCM2835_PINCONF_PARAM_PULL, pull);
+
+	map->type = PIN_MAP_TYPE_CONFIGS_PIN;
+	map->data.configs.group_or_pin = bcm2835_gpio_pins[pin].name;
+	map->data.configs.configs = configs;
+	map->data.configs.num_configs = 1;
+	(*maps)++;
+
+	return 0;
+}
+
+static int bcm2835_pctl_dt_node_to_map(struct pinctrl_dev *pctldev,
+		struct device_node *np,
+		struct pinctrl_map **map, unsigned *num_maps)
+{
+	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
+	struct property *pins, *funcs, *pulls;
+	int num_pins, num_funcs, num_pulls, maps_per_pin;
+	struct pinctrl_map *maps, *cur_map;
+	int i, err;
+	u32 pin, func, pull;
+
+	pins = of_find_property(np, "brcm,pins", NULL);
+	if (!pins) {
+		dev_err(pc->dev, "%s: missing brcm,pins property\n",
+				of_node_full_name(np));
+		return -EINVAL;
+	}
+
+	funcs = of_find_property(np, "brcm,function", NULL);
+	pulls = of_find_property(np, "brcm,pull", NULL);
+
+	if (!funcs && !pulls) {
+		dev_err(pc->dev,
+			"%s: neither brcm,function nor brcm,pull specified\n",
+			of_node_full_name(np));
+		return -EINVAL;
+	}
+
+	num_pins = pins->length / 4;
+	num_funcs = funcs ? (funcs->length / 4) : 0;
+	num_pulls = pulls ? (pulls->length / 4) : 0;
+
+	if (num_funcs > 1 && num_funcs != num_pins) {
+		dev_err(pc->dev,
+			"%s: brcm,function must have 1 or %d entries\n",
+			of_node_full_name(np), num_pins);
+		return -EINVAL;
+	}
+
+	if (num_pulls > 1 && num_pulls != num_pins) {
+		dev_err(pc->dev,
+			"%s: brcm,pull must have 1 or %d entries\n",
+			of_node_full_name(np), num_pins);
+		return -EINVAL;
+	}
+
+	maps_per_pin = 0;
+	if (num_funcs)
+		maps_per_pin++;
+	if (num_pulls)
+		maps_per_pin++;
+	cur_map = maps = kzalloc(num_pins * maps_per_pin * sizeof(*maps),
+				GFP_KERNEL);
+	if (!maps)
+		return -ENOMEM;
+
+	for (i = 0; i < num_pins; i++) {
+		err = of_property_read_u32_index(np, "brcm,pins", i, &pin);
+		if (err)
+			goto out;
+		if (pin >= ARRAY_SIZE(bcm2835_gpio_pins)) {
+			dev_err(pc->dev, "%s: invalid brcm,pins value %d\n",
+				of_node_full_name(np), pin);
+			err = -EINVAL;
+			goto out;
+		}
+
+		if (num_funcs) {
+			err = of_property_read_u32_index(np, "brcm,function",
+					(num_funcs > 1) ? i : 0, &func);
+			if (err)
+				goto out;
+			err = bcm2835_pctl_dt_node_to_map_func(pc, np, pin,
+							func, &cur_map);
+			if (err)
+				goto out;
+		}
+		if (num_pulls) {
+			err = of_property_read_u32_index(np, "brcm,pull",
+					(num_funcs > 1) ? i : 0, &pull);
+			if (err)
+				goto out;
+			err = bcm2835_pctl_dt_node_to_map_pull(pc, np, pin,
+							pull, &cur_map);
+			if (err)
+				goto out;
+		}
+	}
+
+	*map = maps;
+	*num_maps = num_pins * maps_per_pin;
+
+	return 0;
+
+out:
+	kfree(maps);
+	return err;
+}
+
+static const struct pinctrl_ops bcm2835_pctl_ops = {
+	.get_groups_count = bcm2835_pctl_get_groups_count,
+	.get_group_name = bcm2835_pctl_get_group_name,
+	.get_group_pins = bcm2835_pctl_get_group_pins,
+	.pin_dbg_show = bcm2835_pctl_pin_dbg_show,
+	.dt_node_to_map = bcm2835_pctl_dt_node_to_map,
+	.dt_free_map = bcm2835_pctl_dt_free_map,
+};
+
+static int bcm2835_pmx_get_functions_count(struct pinctrl_dev *pctldev)
+{
+	return BCM2835_FSEL_COUNT;
+}
+
+static const char *bcm2835_pmx_get_function_name(struct pinctrl_dev *pctldev,
+		unsigned selector)
+{
+	return bcm2835_functions[selector];
+}
+
+static int bcm2835_pmx_get_function_groups(struct pinctrl_dev *pctldev,
+		unsigned selector,
+		const char * const **groups,
+		unsigned * const num_groups)
+{
+	/* every pin can do every function */
+	*groups = bcm2835_gpio_groups;
+	*num_groups = ARRAY_SIZE(bcm2835_gpio_groups);
+
+	return 0;
+}
+
+static int bcm2835_pmx_set(struct pinctrl_dev *pctldev,
+		unsigned func_selector,
+		unsigned group_selector)
+{
+	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
+
+	bcm2835_pinctrl_fsel_set(pc, group_selector, func_selector);
+
+	return 0;
+}
+
+static void bcm2835_pmx_gpio_disable_free(struct pinctrl_dev *pctldev,
+		struct pinctrl_gpio_range *range,
+		unsigned offset)
+{
+	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
+
+	/* disable by setting to GPIO_IN */
+	bcm2835_pinctrl_fsel_set(pc, offset, BCM2835_FSEL_GPIO_IN);
+}
+
+static int bcm2835_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
+		struct pinctrl_gpio_range *range,
+		unsigned offset,
+		bool input)
+{
+	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
+	enum bcm2835_fsel fsel = input ?
+		BCM2835_FSEL_GPIO_IN : BCM2835_FSEL_GPIO_OUT;
+
+	bcm2835_pinctrl_fsel_set(pc, offset, fsel);
+
+	return 0;
+}
+
+static const struct pinmux_ops bcm2835_pmx_ops = {
+	.get_functions_count = bcm2835_pmx_get_functions_count,
+	.get_function_name = bcm2835_pmx_get_function_name,
+	.get_function_groups = bcm2835_pmx_get_function_groups,
+	.set_mux = bcm2835_pmx_set,
+	.gpio_disable_free = bcm2835_pmx_gpio_disable_free,
+	.gpio_set_direction = bcm2835_pmx_gpio_set_direction,
+};
+
+static int bcm2835_pinconf_get(struct pinctrl_dev *pctldev,
+			unsigned pin, unsigned long *config)
+{
+	/* No way to read back config in HW */
+	return -ENOTSUPP;
+}
+
+static int bcm2835_pinconf_set(struct pinctrl_dev *pctldev,
+			unsigned pin, unsigned long *configs,
+			unsigned num_configs)
+{
+	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
+	enum bcm2835_pinconf_param param;
+	u16 arg;
+	u32 off, bit;
+	int i;
+
+	for (i = 0; i < num_configs; i++) {
+		param = BCM2835_PINCONF_UNPACK_PARAM(configs[i]);
+		arg = BCM2835_PINCONF_UNPACK_ARG(configs[i]);
+
+		if (param != BCM2835_PINCONF_PARAM_PULL)
+			return -EINVAL;
+
+		off = GPIO_REG_OFFSET(pin);
+		bit = GPIO_REG_SHIFT(pin);
+
+		bcm2835_gpio_wr(pc, GPPUD, arg & 3);
+		/*
+		 * Docs say to wait 150 cycles, but not of what. We assume a
+		 * 1 MHz clock here, which is pretty slow...
+		 */
+		udelay(150);
+		bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), BIT(bit));
+		udelay(150);
+		bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), 0);
+	} /* for each config */
+
+	return 0;
+}
+
+static const struct pinconf_ops bcm2835_pinconf_ops = {
+	.pin_config_get = bcm2835_pinconf_get,
+	.pin_config_set = bcm2835_pinconf_set,
+};
+
+static struct pinctrl_desc bcm2835_pinctrl_desc = {
+	.name = MODULE_NAME,
+	.pins = bcm2835_gpio_pins,
+	.npins = ARRAY_SIZE(bcm2835_gpio_pins),
+	.pctlops = &bcm2835_pctl_ops,
+	.pmxops = &bcm2835_pmx_ops,
+	.confops = &bcm2835_pinconf_ops,
+	.owner = THIS_MODULE,
+};
+
+static struct pinctrl_gpio_range bcm2835_pinctrl_gpio_range = {
+	.name = MODULE_NAME,
+	.npins = BCM2835_NUM_GPIOS,
+};
+
+static int bcm2835_pinctrl_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct bcm2835_pinctrl *pc;
+	struct resource iomem;
+	int err, i;
+	BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_pins) != BCM2835_NUM_GPIOS);
+	BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_groups) != BCM2835_NUM_GPIOS);
+
+	pc = devm_kzalloc(dev, sizeof(*pc), GFP_KERNEL);
+	if (!pc)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, pc);
+	pc->dev = dev;
+
+	err = of_address_to_resource(np, 0, &iomem);
+	if (err) {
+		dev_err(dev, "could not get IO memory\n");
+		return err;
+	}
+
+	pc->base = devm_ioremap_resource(dev, &iomem);
+	if (IS_ERR(pc->base))
+		return PTR_ERR(pc->base);
+
+	pc->gpio_chip = bcm2835_gpio_chip;
+	pc->gpio_chip.dev = dev;
+	pc->gpio_chip.of_node = np;
+
+	pc->irq_domain = irq_domain_add_linear(np, BCM2835_NUM_GPIOS,
+			&irq_domain_simple_ops, NULL);
+	if (!pc->irq_domain) {
+		dev_err(dev, "could not create IRQ domain\n");
+		return -ENOMEM;
+	}
+
+	for (i = 0; i < BCM2835_NUM_GPIOS; i++) {
+		int irq = irq_create_mapping(pc->irq_domain, i);
+		irq_set_lockdep_class(irq, &gpio_lock_class);
+		irq_set_chip_and_handler(irq, &bcm2835_gpio_irq_chip,
+				handle_simple_irq);
+		irq_set_chip_data(irq, pc);
+		set_irq_flags(irq, IRQF_VALID);
+	}
+
+	for (i = 0; i < BCM2835_NUM_BANKS; i++) {
+		unsigned long events;
+		unsigned offset;
+		int len;
+		char *name;
+
+		/* clear event detection flags */
+		bcm2835_gpio_wr(pc, GPREN0 + i * 4, 0);
+		bcm2835_gpio_wr(pc, GPFEN0 + i * 4, 0);
+		bcm2835_gpio_wr(pc, GPHEN0 + i * 4, 0);
+		bcm2835_gpio_wr(pc, GPLEN0 + i * 4, 0);
+		bcm2835_gpio_wr(pc, GPAREN0 + i * 4, 0);
+		bcm2835_gpio_wr(pc, GPAFEN0 + i * 4, 0);
+
+		/* clear all the events */
+		events = bcm2835_gpio_rd(pc, GPEDS0 + i * 4);
+		for_each_set_bit(offset, &events, 32)
+			bcm2835_gpio_wr(pc, GPEDS0 + i * 4, BIT(offset));
+
+		pc->irq[i] = irq_of_parse_and_map(np, i);
+		pc->irq_data[i].pc = pc;
+		pc->irq_data[i].bank = i;
+		spin_lock_init(&pc->irq_lock[i]);
+
+		len = strlen(dev_name(pc->dev)) + 16;
+		name = devm_kzalloc(pc->dev, len, GFP_KERNEL);
+		if (!name)
+			return -ENOMEM;
+		snprintf(name, len, "%s:bank%d", dev_name(pc->dev), i);
+
+		err = devm_request_irq(dev, pc->irq[i],
+			bcm2835_gpio_irq_handler, IRQF_SHARED,
+			name, &pc->irq_data[i]);
+		if (err) {
+			dev_err(dev, "unable to request IRQ %d\n", pc->irq[i]);
+			return err;
+		}
+	}
+
+	err = gpiochip_add(&pc->gpio_chip);
+	if (err) {
+		dev_err(dev, "could not add GPIO chip\n");
+		return err;
+	}
+
+	pc->pctl_dev = pinctrl_register(&bcm2835_pinctrl_desc, dev, pc);
+	if (!pc->pctl_dev) {
+		gpiochip_remove(&pc->gpio_chip);
+		return -EINVAL;
+	}
+
+	pc->gpio_range = bcm2835_pinctrl_gpio_range;
+	pc->gpio_range.base = pc->gpio_chip.base;
+	pc->gpio_range.gc = &pc->gpio_chip;
+	pinctrl_add_gpio_range(pc->pctl_dev, &pc->gpio_range);
+
+	return 0;
+}
+
+static int bcm2835_pinctrl_remove(struct platform_device *pdev)
+{
+	struct bcm2835_pinctrl *pc = platform_get_drvdata(pdev);
+
+	pinctrl_unregister(pc->pctl_dev);
+	gpiochip_remove(&pc->gpio_chip);
+
+	return 0;
+}
+
+static struct of_device_id bcm2835_pinctrl_match[] = {
+	{ .compatible = "brcm,bcm2835-gpio" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, bcm2835_pinctrl_match);
+
+static struct platform_driver bcm2835_pinctrl_driver = {
+	.probe = bcm2835_pinctrl_probe,
+	.remove = bcm2835_pinctrl_remove,
+	.driver = {
+		.name = MODULE_NAME,
+		.of_match_table = bcm2835_pinctrl_match,
+	},
+};
+module_platform_driver(bcm2835_pinctrl_driver);
+
+MODULE_AUTHOR("Chris Boot, Simon Arlott, Stephen Warren");
+MODULE_DESCRIPTION("BCM2835 Pin control driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/pinctrl/pinctrl-bcm281xx.c b/drivers/pinctrl/pinctrl-bcm281xx.c
deleted file mode 100644
index fa2a00f..0000000
--- a/drivers/pinctrl/pinctrl-bcm281xx.c
+++ /dev/null
@@ -1,1455 +0,0 @@
-/*
- * Copyright (C) 2013 Broadcom Corporation
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation version 2.
- *
- * This program is distributed "as is" WITHOUT ANY WARRANTY of any
- * kind, whether express or implied; without even the implied warranty
- * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
-#include <linux/err.h>
-#include <linux/io.h>
-#include <linux/module.h>
-#include <linux/of.h>
-#include <linux/platform_device.h>
-#include <linux/pinctrl/pinctrl.h>
-#include <linux/pinctrl/pinmux.h>
-#include <linux/pinctrl/pinconf.h>
-#include <linux/pinctrl/pinconf-generic.h>
-#include <linux/regmap.h>
-#include <linux/slab.h>
-#include "core.h"
-#include "pinctrl-utils.h"
-
-/* BCM281XX Pin Control Registers Definitions */
-
-/* Function Select bits are the same for all pin control registers */
-#define BCM281XX_PIN_REG_F_SEL_MASK		0x0700
-#define BCM281XX_PIN_REG_F_SEL_SHIFT		8
-
-/* Standard pin register */
-#define BCM281XX_STD_PIN_REG_DRV_STR_MASK	0x0007
-#define BCM281XX_STD_PIN_REG_DRV_STR_SHIFT	0
-#define BCM281XX_STD_PIN_REG_INPUT_DIS_MASK	0x0008
-#define BCM281XX_STD_PIN_REG_INPUT_DIS_SHIFT	3
-#define BCM281XX_STD_PIN_REG_SLEW_MASK		0x0010
-#define BCM281XX_STD_PIN_REG_SLEW_SHIFT		4
-#define BCM281XX_STD_PIN_REG_PULL_UP_MASK	0x0020
-#define BCM281XX_STD_PIN_REG_PULL_UP_SHIFT	5
-#define BCM281XX_STD_PIN_REG_PULL_DN_MASK	0x0040
-#define BCM281XX_STD_PIN_REG_PULL_DN_SHIFT	6
-#define BCM281XX_STD_PIN_REG_HYST_MASK		0x0080
-#define BCM281XX_STD_PIN_REG_HYST_SHIFT		7
-
-/* I2C pin register */
-#define BCM281XX_I2C_PIN_REG_INPUT_DIS_MASK	0x0004
-#define BCM281XX_I2C_PIN_REG_INPUT_DIS_SHIFT	2
-#define BCM281XX_I2C_PIN_REG_SLEW_MASK		0x0008
-#define BCM281XX_I2C_PIN_REG_SLEW_SHIFT		3
-#define BCM281XX_I2C_PIN_REG_PULL_UP_STR_MASK	0x0070
-#define BCM281XX_I2C_PIN_REG_PULL_UP_STR_SHIFT	4
-
-/* HDMI pin register */
-#define BCM281XX_HDMI_PIN_REG_INPUT_DIS_MASK	0x0008
-#define BCM281XX_HDMI_PIN_REG_INPUT_DIS_SHIFT	3
-#define BCM281XX_HDMI_PIN_REG_MODE_MASK		0x0010
-#define BCM281XX_HDMI_PIN_REG_MODE_SHIFT	4
-
-/**
- * bcm281xx_pin_type - types of pin register
- */
-enum bcm281xx_pin_type {
-	BCM281XX_PIN_TYPE_UNKNOWN = 0,
-	BCM281XX_PIN_TYPE_STD,
-	BCM281XX_PIN_TYPE_I2C,
-	BCM281XX_PIN_TYPE_HDMI,
-};
-
-static enum bcm281xx_pin_type std_pin = BCM281XX_PIN_TYPE_STD;
-static enum bcm281xx_pin_type i2c_pin = BCM281XX_PIN_TYPE_I2C;
-static enum bcm281xx_pin_type hdmi_pin = BCM281XX_PIN_TYPE_HDMI;
-
-/**
- * bcm281xx_pin_function- define pin function
- */
-struct bcm281xx_pin_function {
-	const char *name;
-	const char * const *groups;
-	const unsigned ngroups;
-};
-
-/**
- * bcm281xx_pinctrl_data - Broadcom-specific pinctrl data
- * @reg_base - base of pinctrl registers
- */
-struct bcm281xx_pinctrl_data {
-	void __iomem *reg_base;
-
-	/* List of all pins */
-	const struct pinctrl_pin_desc *pins;
-	const unsigned npins;
-
-	const struct bcm281xx_pin_function *functions;
-	const unsigned nfunctions;
-
-	struct regmap *regmap;
-};
-
-/*
- * Pin number definition.  The order here must be the same as defined in the
- * PADCTRLREG block in the RDB.
- */
-#define BCM281XX_PIN_ADCSYNC		0
-#define BCM281XX_PIN_BAT_RM		1
-#define BCM281XX_PIN_BSC1_SCL		2
-#define BCM281XX_PIN_BSC1_SDA		3
-#define BCM281XX_PIN_BSC2_SCL		4
-#define BCM281XX_PIN_BSC2_SDA		5
-#define BCM281XX_PIN_CLASSGPWR		6
-#define BCM281XX_PIN_CLK_CX8		7
-#define BCM281XX_PIN_CLKOUT_0		8
-#define BCM281XX_PIN_CLKOUT_1		9
-#define BCM281XX_PIN_CLKOUT_2		10
-#define BCM281XX_PIN_CLKOUT_3		11
-#define BCM281XX_PIN_CLKREQ_IN_0	12
-#define BCM281XX_PIN_CLKREQ_IN_1	13
-#define BCM281XX_PIN_CWS_SYS_REQ1	14
-#define BCM281XX_PIN_CWS_SYS_REQ2	15
-#define BCM281XX_PIN_CWS_SYS_REQ3	16
-#define BCM281XX_PIN_DIGMIC1_CLK	17
-#define BCM281XX_PIN_DIGMIC1_DQ		18
-#define BCM281XX_PIN_DIGMIC2_CLK	19
-#define BCM281XX_PIN_DIGMIC2_DQ		20
-#define BCM281XX_PIN_GPEN13		21
-#define BCM281XX_PIN_GPEN14		22
-#define BCM281XX_PIN_GPEN15		23
-#define BCM281XX_PIN_GPIO00		24
-#define BCM281XX_PIN_GPIO01		25
-#define BCM281XX_PIN_GPIO02		26
-#define BCM281XX_PIN_GPIO03		27
-#define BCM281XX_PIN_GPIO04		28
-#define BCM281XX_PIN_GPIO05		29
-#define BCM281XX_PIN_GPIO06		30
-#define BCM281XX_PIN_GPIO07		31
-#define BCM281XX_PIN_GPIO08		32
-#define BCM281XX_PIN_GPIO09		33
-#define BCM281XX_PIN_GPIO10		34
-#define BCM281XX_PIN_GPIO11		35
-#define BCM281XX_PIN_GPIO12		36
-#define BCM281XX_PIN_GPIO13		37
-#define BCM281XX_PIN_GPIO14		38
-#define BCM281XX_PIN_GPS_PABLANK	39
-#define BCM281XX_PIN_GPS_TMARK		40
-#define BCM281XX_PIN_HDMI_SCL		41
-#define BCM281XX_PIN_HDMI_SDA		42
-#define BCM281XX_PIN_IC_DM		43
-#define BCM281XX_PIN_IC_DP		44
-#define BCM281XX_PIN_KP_COL_IP_0	45
-#define BCM281XX_PIN_KP_COL_IP_1	46
-#define BCM281XX_PIN_KP_COL_IP_2	47
-#define BCM281XX_PIN_KP_COL_IP_3	48
-#define BCM281XX_PIN_KP_ROW_OP_0	49
-#define BCM281XX_PIN_KP_ROW_OP_1	50
-#define BCM281XX_PIN_KP_ROW_OP_2	51
-#define BCM281XX_PIN_KP_ROW_OP_3	52
-#define BCM281XX_PIN_LCD_B_0		53
-#define BCM281XX_PIN_LCD_B_1		54
-#define BCM281XX_PIN_LCD_B_2		55
-#define BCM281XX_PIN_LCD_B_3		56
-#define BCM281XX_PIN_LCD_B_4		57
-#define BCM281XX_PIN_LCD_B_5		58
-#define BCM281XX_PIN_LCD_B_6		59
-#define BCM281XX_PIN_LCD_B_7		60
-#define BCM281XX_PIN_LCD_G_0		61
-#define BCM281XX_PIN_LCD_G_1		62
-#define BCM281XX_PIN_LCD_G_2		63
-#define BCM281XX_PIN_LCD_G_3		64
-#define BCM281XX_PIN_LCD_G_4		65
-#define BCM281XX_PIN_LCD_G_5		66
-#define BCM281XX_PIN_LCD_G_6		67
-#define BCM281XX_PIN_LCD_G_7		68
-#define BCM281XX_PIN_LCD_HSYNC		69
-#define BCM281XX_PIN_LCD_OE		70
-#define BCM281XX_PIN_LCD_PCLK		71
-#define BCM281XX_PIN_LCD_R_0		72
-#define BCM281XX_PIN_LCD_R_1		73
-#define BCM281XX_PIN_LCD_R_2		74
-#define BCM281XX_PIN_LCD_R_3		75
-#define BCM281XX_PIN_LCD_R_4		76
-#define BCM281XX_PIN_LCD_R_5		77
-#define BCM281XX_PIN_LCD_R_6		78
-#define BCM281XX_PIN_LCD_R_7		79
-#define BCM281XX_PIN_LCD_VSYNC		80
-#define BCM281XX_PIN_MDMGPIO0		81
-#define BCM281XX_PIN_MDMGPIO1		82
-#define BCM281XX_PIN_MDMGPIO2		83
-#define BCM281XX_PIN_MDMGPIO3		84
-#define BCM281XX_PIN_MDMGPIO4		85
-#define BCM281XX_PIN_MDMGPIO5		86
-#define BCM281XX_PIN_MDMGPIO6		87
-#define BCM281XX_PIN_MDMGPIO7		88
-#define BCM281XX_PIN_MDMGPIO8		89
-#define BCM281XX_PIN_MPHI_DATA_0	90
-#define BCM281XX_PIN_MPHI_DATA_1	91
-#define BCM281XX_PIN_MPHI_DATA_2	92
-#define BCM281XX_PIN_MPHI_DATA_3	93
-#define BCM281XX_PIN_MPHI_DATA_4	94
-#define BCM281XX_PIN_MPHI_DATA_5	95
-#define BCM281XX_PIN_MPHI_DATA_6	96
-#define BCM281XX_PIN_MPHI_DATA_7	97
-#define BCM281XX_PIN_MPHI_DATA_8	98
-#define BCM281XX_PIN_MPHI_DATA_9	99
-#define BCM281XX_PIN_MPHI_DATA_10	100
-#define BCM281XX_PIN_MPHI_DATA_11	101
-#define BCM281XX_PIN_MPHI_DATA_12	102
-#define BCM281XX_PIN_MPHI_DATA_13	103
-#define BCM281XX_PIN_MPHI_DATA_14	104
-#define BCM281XX_PIN_MPHI_DATA_15	105
-#define BCM281XX_PIN_MPHI_HA0		106
-#define BCM281XX_PIN_MPHI_HAT0		107
-#define BCM281XX_PIN_MPHI_HAT1		108
-#define BCM281XX_PIN_MPHI_HCE0_N	109
-#define BCM281XX_PIN_MPHI_HCE1_N	110
-#define BCM281XX_PIN_MPHI_HRD_N		111
-#define BCM281XX_PIN_MPHI_HWR_N		112
-#define BCM281XX_PIN_MPHI_RUN0		113
-#define BCM281XX_PIN_MPHI_RUN1		114
-#define BCM281XX_PIN_MTX_SCAN_CLK	115
-#define BCM281XX_PIN_MTX_SCAN_DATA	116
-#define BCM281XX_PIN_NAND_AD_0		117
-#define BCM281XX_PIN_NAND_AD_1		118
-#define BCM281XX_PIN_NAND_AD_2		119
-#define BCM281XX_PIN_NAND_AD_3		120
-#define BCM281XX_PIN_NAND_AD_4		121
-#define BCM281XX_PIN_NAND_AD_5		122
-#define BCM281XX_PIN_NAND_AD_6		123
-#define BCM281XX_PIN_NAND_AD_7		124
-#define BCM281XX_PIN_NAND_ALE		125
-#define BCM281XX_PIN_NAND_CEN_0		126
-#define BCM281XX_PIN_NAND_CEN_1		127
-#define BCM281XX_PIN_NAND_CLE		128
-#define BCM281XX_PIN_NAND_OEN		129
-#define BCM281XX_PIN_NAND_RDY_0		130
-#define BCM281XX_PIN_NAND_RDY_1		131
-#define BCM281XX_PIN_NAND_WEN		132
-#define BCM281XX_PIN_NAND_WP		133
-#define BCM281XX_PIN_PC1		134
-#define BCM281XX_PIN_PC2		135
-#define BCM281XX_PIN_PMU_INT		136
-#define BCM281XX_PIN_PMU_SCL		137
-#define BCM281XX_PIN_PMU_SDA		138
-#define BCM281XX_PIN_RFST2G_MTSLOTEN3G	139
-#define BCM281XX_PIN_RGMII_0_RX_CTL	140
-#define BCM281XX_PIN_RGMII_0_RXC	141
-#define BCM281XX_PIN_RGMII_0_RXD_0	142
-#define BCM281XX_PIN_RGMII_0_RXD_1	143
-#define BCM281XX_PIN_RGMII_0_RXD_2	144
-#define BCM281XX_PIN_RGMII_0_RXD_3	145
-#define BCM281XX_PIN_RGMII_0_TX_CTL	146
-#define BCM281XX_PIN_RGMII_0_TXC	147
-#define BCM281XX_PIN_RGMII_0_TXD_0	148
-#define BCM281XX_PIN_RGMII_0_TXD_1	149
-#define BCM281XX_PIN_RGMII_0_TXD_2	150
-#define BCM281XX_PIN_RGMII_0_TXD_3	151
-#define BCM281XX_PIN_RGMII_1_RX_CTL	152
-#define BCM281XX_PIN_RGMII_1_RXC	153
-#define BCM281XX_PIN_RGMII_1_RXD_0	154
-#define BCM281XX_PIN_RGMII_1_RXD_1	155
-#define BCM281XX_PIN_RGMII_1_RXD_2	156
-#define BCM281XX_PIN_RGMII_1_RXD_3	157
-#define BCM281XX_PIN_RGMII_1_TX_CTL	158
-#define BCM281XX_PIN_RGMII_1_TXC	159
-#define BCM281XX_PIN_RGMII_1_TXD_0	160
-#define BCM281XX_PIN_RGMII_1_TXD_1	161
-#define BCM281XX_PIN_RGMII_1_TXD_2	162
-#define BCM281XX_PIN_RGMII_1_TXD_3	163
-#define BCM281XX_PIN_RGMII_GPIO_0	164
-#define BCM281XX_PIN_RGMII_GPIO_1	165
-#define BCM281XX_PIN_RGMII_GPIO_2	166
-#define BCM281XX_PIN_RGMII_GPIO_3	167
-#define BCM281XX_PIN_RTXDATA2G_TXDATA3G1	168
-#define BCM281XX_PIN_RTXEN2G_TXDATA3G2	169
-#define BCM281XX_PIN_RXDATA3G0		170
-#define BCM281XX_PIN_RXDATA3G1		171
-#define BCM281XX_PIN_RXDATA3G2		172
-#define BCM281XX_PIN_SDIO1_CLK		173
-#define BCM281XX_PIN_SDIO1_CMD		174
-#define BCM281XX_PIN_SDIO1_DATA_0	175
-#define BCM281XX_PIN_SDIO1_DATA_1	176
-#define BCM281XX_PIN_SDIO1_DATA_2	177
-#define BCM281XX_PIN_SDIO1_DATA_3	178
-#define BCM281XX_PIN_SDIO4_CLK		179
-#define BCM281XX_PIN_SDIO4_CMD		180
-#define BCM281XX_PIN_SDIO4_DATA_0	181
-#define BCM281XX_PIN_SDIO4_DATA_1	182
-#define BCM281XX_PIN_SDIO4_DATA_2	183
-#define BCM281XX_PIN_SDIO4_DATA_3	184
-#define BCM281XX_PIN_SIM_CLK		185
-#define BCM281XX_PIN_SIM_DATA		186
-#define BCM281XX_PIN_SIM_DET		187
-#define BCM281XX_PIN_SIM_RESETN		188
-#define BCM281XX_PIN_SIM2_CLK		189
-#define BCM281XX_PIN_SIM2_DATA		190
-#define BCM281XX_PIN_SIM2_DET		191
-#define BCM281XX_PIN_SIM2_RESETN	192
-#define BCM281XX_PIN_SRI_C		193
-#define BCM281XX_PIN_SRI_D		194
-#define BCM281XX_PIN_SRI_E		195
-#define BCM281XX_PIN_SSP_EXTCLK		196
-#define BCM281XX_PIN_SSP0_CLK		197
-#define BCM281XX_PIN_SSP0_FS		198
-#define BCM281XX_PIN_SSP0_RXD		199
-#define BCM281XX_PIN_SSP0_TXD		200
-#define BCM281XX_PIN_SSP2_CLK		201
-#define BCM281XX_PIN_SSP2_FS_0		202
-#define BCM281XX_PIN_SSP2_FS_1		203
-#define BCM281XX_PIN_SSP2_FS_2		204
-#define BCM281XX_PIN_SSP2_FS_3		205
-#define BCM281XX_PIN_SSP2_RXD_0		206
-#define BCM281XX_PIN_SSP2_RXD_1		207
-#define BCM281XX_PIN_SSP2_TXD_0		208
-#define BCM281XX_PIN_SSP2_TXD_1		209
-#define BCM281XX_PIN_SSP3_CLK		210
-#define BCM281XX_PIN_SSP3_FS		211
-#define BCM281XX_PIN_SSP3_RXD		212
-#define BCM281XX_PIN_SSP3_TXD		213
-#define BCM281XX_PIN_SSP4_CLK		214
-#define BCM281XX_PIN_SSP4_FS		215
-#define BCM281XX_PIN_SSP4_RXD		216
-#define BCM281XX_PIN_SSP4_TXD		217
-#define BCM281XX_PIN_SSP5_CLK		218
-#define BCM281XX_PIN_SSP5_FS		219
-#define BCM281XX_PIN_SSP5_RXD		220
-#define BCM281XX_PIN_SSP5_TXD		221
-#define BCM281XX_PIN_SSP6_CLK		222
-#define BCM281XX_PIN_SSP6_FS		223
-#define BCM281XX_PIN_SSP6_RXD		224
-#define BCM281XX_PIN_SSP6_TXD		225
-#define BCM281XX_PIN_STAT_1		226
-#define BCM281XX_PIN_STAT_2		227
-#define BCM281XX_PIN_SYSCLKEN		228
-#define BCM281XX_PIN_TRACECLK		229
-#define BCM281XX_PIN_TRACEDT00		230
-#define BCM281XX_PIN_TRACEDT01		231
-#define BCM281XX_PIN_TRACEDT02		232
-#define BCM281XX_PIN_TRACEDT03		233
-#define BCM281XX_PIN_TRACEDT04		234
-#define BCM281XX_PIN_TRACEDT05		235
-#define BCM281XX_PIN_TRACEDT06		236
-#define BCM281XX_PIN_TRACEDT07		237
-#define BCM281XX_PIN_TRACEDT08		238
-#define BCM281XX_PIN_TRACEDT09		239
-#define BCM281XX_PIN_TRACEDT10		240
-#define BCM281XX_PIN_TRACEDT11		241
-#define BCM281XX_PIN_TRACEDT12		242
-#define BCM281XX_PIN_TRACEDT13		243
-#define BCM281XX_PIN_TRACEDT14		244
-#define BCM281XX_PIN_TRACEDT15		245
-#define BCM281XX_PIN_TXDATA3G0		246
-#define BCM281XX_PIN_TXPWRIND		247
-#define BCM281XX_PIN_UARTB1_UCTS	248
-#define BCM281XX_PIN_UARTB1_URTS	249
-#define BCM281XX_PIN_UARTB1_URXD	250
-#define BCM281XX_PIN_UARTB1_UTXD	251
-#define BCM281XX_PIN_UARTB2_URXD	252
-#define BCM281XX_PIN_UARTB2_UTXD	253
-#define BCM281XX_PIN_UARTB3_UCTS	254
-#define BCM281XX_PIN_UARTB3_URTS	255
-#define BCM281XX_PIN_UARTB3_URXD	256
-#define BCM281XX_PIN_UARTB3_UTXD	257
-#define BCM281XX_PIN_UARTB4_UCTS	258
-#define BCM281XX_PIN_UARTB4_URTS	259
-#define BCM281XX_PIN_UARTB4_URXD	260
-#define BCM281XX_PIN_UARTB4_UTXD	261
-#define BCM281XX_PIN_VC_CAM1_SCL	262
-#define BCM281XX_PIN_VC_CAM1_SDA	263
-#define BCM281XX_PIN_VC_CAM2_SCL	264
-#define BCM281XX_PIN_VC_CAM2_SDA	265
-#define BCM281XX_PIN_VC_CAM3_SCL	266
-#define BCM281XX_PIN_VC_CAM3_SDA	267
-
-#define BCM281XX_PIN_DESC(a, b, c) \
-	{ .number = a, .name = b, .drv_data = &c##_pin }
-
-/*
- * Pin description definition.  The order here must be the same as defined in
- * the PADCTRLREG block in the RDB, since the pin number is used as an index
- * into this array.
- */
-static const struct pinctrl_pin_desc bcm281xx_pinctrl_pins[] = {
-	BCM281XX_PIN_DESC(BCM281XX_PIN_ADCSYNC, "adcsync", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_BAT_RM, "bat_rm", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_BSC1_SCL, "bsc1_scl", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_BSC1_SDA, "bsc1_sda", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_BSC2_SCL, "bsc2_scl", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_BSC2_SDA, "bsc2_sda", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CLASSGPWR, "classgpwr", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CLK_CX8, "clk_cx8", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKOUT_0, "clkout_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKOUT_1, "clkout_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKOUT_2, "clkout_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKOUT_3, "clkout_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKREQ_IN_0, "clkreq_in_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CLKREQ_IN_1, "clkreq_in_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CWS_SYS_REQ1, "cws_sys_req1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CWS_SYS_REQ2, "cws_sys_req2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_CWS_SYS_REQ3, "cws_sys_req3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_DIGMIC1_CLK, "digmic1_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_DIGMIC1_DQ, "digmic1_dq", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_DIGMIC2_CLK, "digmic2_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_DIGMIC2_DQ, "digmic2_dq", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPEN13, "gpen13", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPEN14, "gpen14", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPEN15, "gpen15", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO00, "gpio00", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO01, "gpio01", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO02, "gpio02", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO03, "gpio03", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO04, "gpio04", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO05, "gpio05", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO06, "gpio06", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO07, "gpio07", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO08, "gpio08", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO09, "gpio09", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO10, "gpio10", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO11, "gpio11", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO12, "gpio12", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO13, "gpio13", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPIO14, "gpio14", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPS_PABLANK, "gps_pablank", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_GPS_TMARK, "gps_tmark", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_HDMI_SCL, "hdmi_scl", hdmi),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_HDMI_SDA, "hdmi_sda", hdmi),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_IC_DM, "ic_dm", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_IC_DP, "ic_dp", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_COL_IP_0, "kp_col_ip_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_COL_IP_1, "kp_col_ip_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_COL_IP_2, "kp_col_ip_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_COL_IP_3, "kp_col_ip_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_ROW_OP_0, "kp_row_op_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_ROW_OP_1, "kp_row_op_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_ROW_OP_2, "kp_row_op_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_KP_ROW_OP_3, "kp_row_op_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_0, "lcd_b_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_1, "lcd_b_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_2, "lcd_b_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_3, "lcd_b_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_4, "lcd_b_4", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_5, "lcd_b_5", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_6, "lcd_b_6", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_B_7, "lcd_b_7", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_0, "lcd_g_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_1, "lcd_g_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_2, "lcd_g_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_3, "lcd_g_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_4, "lcd_g_4", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_5, "lcd_g_5", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_6, "lcd_g_6", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_G_7, "lcd_g_7", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_HSYNC, "lcd_hsync", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_OE, "lcd_oe", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_PCLK, "lcd_pclk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_0, "lcd_r_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_1, "lcd_r_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_2, "lcd_r_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_3, "lcd_r_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_4, "lcd_r_4", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_5, "lcd_r_5", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_6, "lcd_r_6", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_R_7, "lcd_r_7", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_LCD_VSYNC, "lcd_vsync", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO0, "mdmgpio0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO1, "mdmgpio1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO2, "mdmgpio2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO3, "mdmgpio3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO4, "mdmgpio4", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO5, "mdmgpio5", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO6, "mdmgpio6", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO7, "mdmgpio7", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MDMGPIO8, "mdmgpio8", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_0, "mphi_data_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_1, "mphi_data_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_2, "mphi_data_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_3, "mphi_data_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_4, "mphi_data_4", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_5, "mphi_data_5", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_6, "mphi_data_6", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_7, "mphi_data_7", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_8, "mphi_data_8", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_9, "mphi_data_9", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_10, "mphi_data_10", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_11, "mphi_data_11", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_12, "mphi_data_12", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_13, "mphi_data_13", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_14, "mphi_data_14", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_DATA_15, "mphi_data_15", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HA0, "mphi_ha0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HAT0, "mphi_hat0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HAT1, "mphi_hat1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HCE0_N, "mphi_hce0_n", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HCE1_N, "mphi_hce1_n", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HRD_N, "mphi_hrd_n", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_HWR_N, "mphi_hwr_n", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_RUN0, "mphi_run0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MPHI_RUN1, "mphi_run1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MTX_SCAN_CLK, "mtx_scan_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_MTX_SCAN_DATA, "mtx_scan_data", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_0, "nand_ad_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_1, "nand_ad_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_2, "nand_ad_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_3, "nand_ad_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_4, "nand_ad_4", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_5, "nand_ad_5", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_6, "nand_ad_6", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_AD_7, "nand_ad_7", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_ALE, "nand_ale", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_CEN_0, "nand_cen_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_CEN_1, "nand_cen_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_CLE, "nand_cle", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_OEN, "nand_oen", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_RDY_0, "nand_rdy_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_RDY_1, "nand_rdy_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_WEN, "nand_wen", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_NAND_WP, "nand_wp", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_PC1, "pc1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_PC2, "pc2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_PMU_INT, "pmu_int", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_PMU_SCL, "pmu_scl", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_PMU_SDA, "pmu_sda", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RFST2G_MTSLOTEN3G, "rfst2g_mtsloten3g",
-		std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RX_CTL, "rgmii_0_rx_ctl", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXC, "rgmii_0_rxc", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXD_0, "rgmii_0_rxd_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXD_1, "rgmii_0_rxd_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXD_2, "rgmii_0_rxd_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_RXD_3, "rgmii_0_rxd_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TX_CTL, "rgmii_0_tx_ctl", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXC, "rgmii_0_txc", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXD_0, "rgmii_0_txd_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXD_1, "rgmii_0_txd_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXD_2, "rgmii_0_txd_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_0_TXD_3, "rgmii_0_txd_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RX_CTL, "rgmii_1_rx_ctl", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXC, "rgmii_1_rxc", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXD_0, "rgmii_1_rxd_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXD_1, "rgmii_1_rxd_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXD_2, "rgmii_1_rxd_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_RXD_3, "rgmii_1_rxd_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TX_CTL, "rgmii_1_tx_ctl", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXC, "rgmii_1_txc", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXD_0, "rgmii_1_txd_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXD_1, "rgmii_1_txd_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXD_2, "rgmii_1_txd_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_1_TXD_3, "rgmii_1_txd_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_GPIO_0, "rgmii_gpio_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_GPIO_1, "rgmii_gpio_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_GPIO_2, "rgmii_gpio_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RGMII_GPIO_3, "rgmii_gpio_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RTXDATA2G_TXDATA3G1,
-		"rtxdata2g_txdata3g1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RTXEN2G_TXDATA3G2, "rtxen2g_txdata3g2",
-		std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RXDATA3G0, "rxdata3g0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RXDATA3G1, "rxdata3g1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_RXDATA3G2, "rxdata3g2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_CLK, "sdio1_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_CMD, "sdio1_cmd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_DATA_0, "sdio1_data_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_DATA_1, "sdio1_data_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_DATA_2, "sdio1_data_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO1_DATA_3, "sdio1_data_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_CLK, "sdio4_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_CMD, "sdio4_cmd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_DATA_0, "sdio4_data_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_DATA_1, "sdio4_data_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_DATA_2, "sdio4_data_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SDIO4_DATA_3, "sdio4_data_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM_CLK, "sim_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM_DATA, "sim_data", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM_DET, "sim_det", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM_RESETN, "sim_resetn", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM2_CLK, "sim2_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM2_DATA, "sim2_data", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM2_DET, "sim2_det", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SIM2_RESETN, "sim2_resetn", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SRI_C, "sri_c", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SRI_D, "sri_d", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SRI_E, "sri_e", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP_EXTCLK, "ssp_extclk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP0_CLK, "ssp0_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP0_FS, "ssp0_fs", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP0_RXD, "ssp0_rxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP0_TXD, "ssp0_txd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_CLK, "ssp2_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_FS_0, "ssp2_fs_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_FS_1, "ssp2_fs_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_FS_2, "ssp2_fs_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_FS_3, "ssp2_fs_3", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_RXD_0, "ssp2_rxd_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_RXD_1, "ssp2_rxd_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_TXD_0, "ssp2_txd_0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP2_TXD_1, "ssp2_txd_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP3_CLK, "ssp3_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP3_FS, "ssp3_fs", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP3_RXD, "ssp3_rxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP3_TXD, "ssp3_txd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP4_CLK, "ssp4_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP4_FS, "ssp4_fs", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP4_RXD, "ssp4_rxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP4_TXD, "ssp4_txd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP5_CLK, "ssp5_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP5_FS, "ssp5_fs", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP5_RXD, "ssp5_rxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP5_TXD, "ssp5_txd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP6_CLK, "ssp6_clk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP6_FS, "ssp6_fs", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP6_RXD, "ssp6_rxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SSP6_TXD, "ssp6_txd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_STAT_1, "stat_1", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_STAT_2, "stat_2", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_SYSCLKEN, "sysclken", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACECLK, "traceclk", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT00, "tracedt00", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT01, "tracedt01", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT02, "tracedt02", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT03, "tracedt03", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT04, "tracedt04", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT05, "tracedt05", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT06, "tracedt06", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT07, "tracedt07", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT08, "tracedt08", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT09, "tracedt09", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT10, "tracedt10", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT11, "tracedt11", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT12, "tracedt12", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT13, "tracedt13", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT14, "tracedt14", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TRACEDT15, "tracedt15", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TXDATA3G0, "txdata3g0", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_TXPWRIND, "txpwrind", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB1_UCTS, "uartb1_ucts", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB1_URTS, "uartb1_urts", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB1_URXD, "uartb1_urxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB1_UTXD, "uartb1_utxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB2_URXD, "uartb2_urxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB2_UTXD, "uartb2_utxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB3_UCTS, "uartb3_ucts", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB3_URTS, "uartb3_urts", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB3_URXD, "uartb3_urxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB3_UTXD, "uartb3_utxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB4_UCTS, "uartb4_ucts", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB4_URTS, "uartb4_urts", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB4_URXD, "uartb4_urxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_UARTB4_UTXD, "uartb4_utxd", std),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM1_SCL, "vc_cam1_scl", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM1_SDA, "vc_cam1_sda", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM2_SCL, "vc_cam2_scl", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM2_SDA, "vc_cam2_sda", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM3_SCL, "vc_cam3_scl", i2c),
-	BCM281XX_PIN_DESC(BCM281XX_PIN_VC_CAM3_SDA, "vc_cam3_sda", i2c),
-};
-
-static const char * const bcm281xx_alt_groups[] = {
-	"adcsync",
-	"bat_rm",
-	"bsc1_scl",
-	"bsc1_sda",
-	"bsc2_scl",
-	"bsc2_sda",
-	"classgpwr",
-	"clk_cx8",
-	"clkout_0",
-	"clkout_1",
-	"clkout_2",
-	"clkout_3",
-	"clkreq_in_0",
-	"clkreq_in_1",
-	"cws_sys_req1",
-	"cws_sys_req2",
-	"cws_sys_req3",
-	"digmic1_clk",
-	"digmic1_dq",
-	"digmic2_clk",
-	"digmic2_dq",
-	"gpen13",
-	"gpen14",
-	"gpen15",
-	"gpio00",
-	"gpio01",
-	"gpio02",
-	"gpio03",
-	"gpio04",
-	"gpio05",
-	"gpio06",
-	"gpio07",
-	"gpio08",
-	"gpio09",
-	"gpio10",
-	"gpio11",
-	"gpio12",
-	"gpio13",
-	"gpio14",
-	"gps_pablank",
-	"gps_tmark",
-	"hdmi_scl",
-	"hdmi_sda",
-	"ic_dm",
-	"ic_dp",
-	"kp_col_ip_0",
-	"kp_col_ip_1",
-	"kp_col_ip_2",
-	"kp_col_ip_3",
-	"kp_row_op_0",
-	"kp_row_op_1",
-	"kp_row_op_2",
-	"kp_row_op_3",
-	"lcd_b_0",
-	"lcd_b_1",
-	"lcd_b_2",
-	"lcd_b_3",
-	"lcd_b_4",
-	"lcd_b_5",
-	"lcd_b_6",
-	"lcd_b_7",
-	"lcd_g_0",
-	"lcd_g_1",
-	"lcd_g_2",
-	"lcd_g_3",
-	"lcd_g_4",
-	"lcd_g_5",
-	"lcd_g_6",
-	"lcd_g_7",
-	"lcd_hsync",
-	"lcd_oe",
-	"lcd_pclk",
-	"lcd_r_0",
-	"lcd_r_1",
-	"lcd_r_2",
-	"lcd_r_3",
-	"lcd_r_4",
-	"lcd_r_5",
-	"lcd_r_6",
-	"lcd_r_7",
-	"lcd_vsync",
-	"mdmgpio0",
-	"mdmgpio1",
-	"mdmgpio2",
-	"mdmgpio3",
-	"mdmgpio4",
-	"mdmgpio5",
-	"mdmgpio6",
-	"mdmgpio7",
-	"mdmgpio8",
-	"mphi_data_0",
-	"mphi_data_1",
-	"mphi_data_2",
-	"mphi_data_3",
-	"mphi_data_4",
-	"mphi_data_5",
-	"mphi_data_6",
-	"mphi_data_7",
-	"mphi_data_8",
-	"mphi_data_9",
-	"mphi_data_10",
-	"mphi_data_11",
-	"mphi_data_12",
-	"mphi_data_13",
-	"mphi_data_14",
-	"mphi_data_15",
-	"mphi_ha0",
-	"mphi_hat0",
-	"mphi_hat1",
-	"mphi_hce0_n",
-	"mphi_hce1_n",
-	"mphi_hrd_n",
-	"mphi_hwr_n",
-	"mphi_run0",
-	"mphi_run1",
-	"mtx_scan_clk",
-	"mtx_scan_data",
-	"nand_ad_0",
-	"nand_ad_1",
-	"nand_ad_2",
-	"nand_ad_3",
-	"nand_ad_4",
-	"nand_ad_5",
-	"nand_ad_6",
-	"nand_ad_7",
-	"nand_ale",
-	"nand_cen_0",
-	"nand_cen_1",
-	"nand_cle",
-	"nand_oen",
-	"nand_rdy_0",
-	"nand_rdy_1",
-	"nand_wen",
-	"nand_wp",
-	"pc1",
-	"pc2",
-	"pmu_int",
-	"pmu_scl",
-	"pmu_sda",
-	"rfst2g_mtsloten3g",
-	"rgmii_0_rx_ctl",
-	"rgmii_0_rxc",
-	"rgmii_0_rxd_0",
-	"rgmii_0_rxd_1",
-	"rgmii_0_rxd_2",
-	"rgmii_0_rxd_3",
-	"rgmii_0_tx_ctl",
-	"rgmii_0_txc",
-	"rgmii_0_txd_0",
-	"rgmii_0_txd_1",
-	"rgmii_0_txd_2",
-	"rgmii_0_txd_3",
-	"rgmii_1_rx_ctl",
-	"rgmii_1_rxc",
-	"rgmii_1_rxd_0",
-	"rgmii_1_rxd_1",
-	"rgmii_1_rxd_2",
-	"rgmii_1_rxd_3",
-	"rgmii_1_tx_ctl",
-	"rgmii_1_txc",
-	"rgmii_1_txd_0",
-	"rgmii_1_txd_1",
-	"rgmii_1_txd_2",
-	"rgmii_1_txd_3",
-	"rgmii_gpio_0",
-	"rgmii_gpio_1",
-	"rgmii_gpio_2",
-	"rgmii_gpio_3",
-	"rtxdata2g_txdata3g1",
-	"rtxen2g_txdata3g2",
-	"rxdata3g0",
-	"rxdata3g1",
-	"rxdata3g2",
-	"sdio1_clk",
-	"sdio1_cmd",
-	"sdio1_data_0",
-	"sdio1_data_1",
-	"sdio1_data_2",
-	"sdio1_data_3",
-	"sdio4_clk",
-	"sdio4_cmd",
-	"sdio4_data_0",
-	"sdio4_data_1",
-	"sdio4_data_2",
-	"sdio4_data_3",
-	"sim_clk",
-	"sim_data",
-	"sim_det",
-	"sim_resetn",
-	"sim2_clk",
-	"sim2_data",
-	"sim2_det",
-	"sim2_resetn",
-	"sri_c",
-	"sri_d",
-	"sri_e",
-	"ssp_extclk",
-	"ssp0_clk",
-	"ssp0_fs",
-	"ssp0_rxd",
-	"ssp0_txd",
-	"ssp2_clk",
-	"ssp2_fs_0",
-	"ssp2_fs_1",
-	"ssp2_fs_2",
-	"ssp2_fs_3",
-	"ssp2_rxd_0",
-	"ssp2_rxd_1",
-	"ssp2_txd_0",
-	"ssp2_txd_1",
-	"ssp3_clk",
-	"ssp3_fs",
-	"ssp3_rxd",
-	"ssp3_txd",
-	"ssp4_clk",
-	"ssp4_fs",
-	"ssp4_rxd",
-	"ssp4_txd",
-	"ssp5_clk",
-	"ssp5_fs",
-	"ssp5_rxd",
-	"ssp5_txd",
-	"ssp6_clk",
-	"ssp6_fs",
-	"ssp6_rxd",
-	"ssp6_txd",
-	"stat_1",
-	"stat_2",
-	"sysclken",
-	"traceclk",
-	"tracedt00",
-	"tracedt01",
-	"tracedt02",
-	"tracedt03",
-	"tracedt04",
-	"tracedt05",
-	"tracedt06",
-	"tracedt07",
-	"tracedt08",
-	"tracedt09",
-	"tracedt10",
-	"tracedt11",
-	"tracedt12",
-	"tracedt13",
-	"tracedt14",
-	"tracedt15",
-	"txdata3g0",
-	"txpwrind",
-	"uartb1_ucts",
-	"uartb1_urts",
-	"uartb1_urxd",
-	"uartb1_utxd",
-	"uartb2_urxd",
-	"uartb2_utxd",
-	"uartb3_ucts",
-	"uartb3_urts",
-	"uartb3_urxd",
-	"uartb3_utxd",
-	"uartb4_ucts",
-	"uartb4_urts",
-	"uartb4_urxd",
-	"uartb4_utxd",
-	"vc_cam1_scl",
-	"vc_cam1_sda",
-	"vc_cam2_scl",
-	"vc_cam2_sda",
-	"vc_cam3_scl",
-	"vc_cam3_sda",
-};
-
-/* Every pin can implement all ALT1-ALT4 functions */
-#define BCM281XX_PIN_FUNCTION(fcn_name)			\
-{							\
-	.name = #fcn_name,				\
-	.groups = bcm281xx_alt_groups,			\
-	.ngroups = ARRAY_SIZE(bcm281xx_alt_groups),	\
-}
-
-static const struct bcm281xx_pin_function bcm281xx_functions[] = {
-	BCM281XX_PIN_FUNCTION(alt1),
-	BCM281XX_PIN_FUNCTION(alt2),
-	BCM281XX_PIN_FUNCTION(alt3),
-	BCM281XX_PIN_FUNCTION(alt4),
-};
-
-static struct bcm281xx_pinctrl_data bcm281xx_pinctrl = {
-	.pins = bcm281xx_pinctrl_pins,
-	.npins = ARRAY_SIZE(bcm281xx_pinctrl_pins),
-	.functions = bcm281xx_functions,
-	.nfunctions = ARRAY_SIZE(bcm281xx_functions),
-};
-
-static inline enum bcm281xx_pin_type pin_type_get(struct pinctrl_dev *pctldev,
-						  unsigned pin)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-
-	if (pin >= pdata->npins)
-		return BCM281XX_PIN_TYPE_UNKNOWN;
-
-	return *(enum bcm281xx_pin_type *)(pdata->pins[pin].drv_data);
-}
-
-#define BCM281XX_PIN_SHIFT(type, param) \
-	(BCM281XX_ ## type ## _PIN_REG_ ## param ## _SHIFT)
-
-#define BCM281XX_PIN_MASK(type, param) \
-	(BCM281XX_ ## type ## _PIN_REG_ ## param ## _MASK)
-
-/*
- * This helper function is used to build up the value and mask used to write to
- * a pin register, but does not actually write to the register.
- */
-static inline void bcm281xx_pin_update(u32 *reg_val, u32 *reg_mask,
-				       u32 param_val, u32 param_shift,
-				       u32 param_mask)
-{
-	*reg_val &= ~param_mask;
-	*reg_val |= (param_val << param_shift) & param_mask;
-	*reg_mask |= param_mask;
-}
-
-static struct regmap_config bcm281xx_pinctrl_regmap_config = {
-	.reg_bits = 32,
-	.reg_stride = 4,
-	.val_bits = 32,
-	.max_register = BCM281XX_PIN_VC_CAM3_SDA,
-};
-
-static int bcm281xx_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-
-	return pdata->npins;
-}
-
-static const char *bcm281xx_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
-						   unsigned group)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-
-	return pdata->pins[group].name;
-}
-
-static int bcm281xx_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
-					   unsigned group,
-					   const unsigned **pins,
-					   unsigned *num_pins)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-
-	*pins = &pdata->pins[group].number;
-	*num_pins = 1;
-
-	return 0;
-}
-
-static void bcm281xx_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
-					  struct seq_file *s,
-					  unsigned offset)
-{
-	seq_printf(s, " %s", dev_name(pctldev->dev));
-}
-
-static struct pinctrl_ops bcm281xx_pinctrl_ops = {
-	.get_groups_count = bcm281xx_pinctrl_get_groups_count,
-	.get_group_name = bcm281xx_pinctrl_get_group_name,
-	.get_group_pins = bcm281xx_pinctrl_get_group_pins,
-	.pin_dbg_show = bcm281xx_pinctrl_pin_dbg_show,
-	.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
-	.dt_free_map = pinctrl_utils_dt_free_map,
-};
-
-static int bcm281xx_pinctrl_get_fcns_count(struct pinctrl_dev *pctldev)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-
-	return pdata->nfunctions;
-}
-
-static const char *bcm281xx_pinctrl_get_fcn_name(struct pinctrl_dev *pctldev,
-						 unsigned function)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-
-	return pdata->functions[function].name;
-}
-
-static int bcm281xx_pinctrl_get_fcn_groups(struct pinctrl_dev *pctldev,
-					   unsigned function,
-					   const char * const **groups,
-					   unsigned * const num_groups)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-
-	*groups = pdata->functions[function].groups;
-	*num_groups = pdata->functions[function].ngroups;
-
-	return 0;
-}
-
-static int bcm281xx_pinmux_set(struct pinctrl_dev *pctldev,
-			       unsigned function,
-			       unsigned group)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-	const struct bcm281xx_pin_function *f = &pdata->functions[function];
-	u32 offset = 4 * pdata->pins[group].number;
-	int rc = 0;
-
-	dev_dbg(pctldev->dev,
-		"%s(): Enable function %s (%d) of pin %s (%d) @offset 0x%x.\n",
-		__func__, f->name, function, pdata->pins[group].name,
-		pdata->pins[group].number, offset);
-
-	rc = regmap_update_bits(pdata->regmap, offset,
-		BCM281XX_PIN_REG_F_SEL_MASK,
-		function << BCM281XX_PIN_REG_F_SEL_SHIFT);
-	if (rc)
-		dev_err(pctldev->dev,
-			"Error updating register for pin %s (%d).\n",
-			pdata->pins[group].name, pdata->pins[group].number);
-
-	return rc;
-}
-
-static struct pinmux_ops bcm281xx_pinctrl_pinmux_ops = {
-	.get_functions_count = bcm281xx_pinctrl_get_fcns_count,
-	.get_function_name = bcm281xx_pinctrl_get_fcn_name,
-	.get_function_groups = bcm281xx_pinctrl_get_fcn_groups,
-	.set_mux = bcm281xx_pinmux_set,
-};
-
-static int bcm281xx_pinctrl_pin_config_get(struct pinctrl_dev *pctldev,
-					   unsigned pin,
-					   unsigned long *config)
-{
-	return -ENOTSUPP;
-}
-
-
-/* Goes through the configs and update register val/mask */
-static int bcm281xx_std_pin_update(struct pinctrl_dev *pctldev,
-				   unsigned pin,
-				   unsigned long *configs,
-				   unsigned num_configs,
-				   u32 *val,
-				   u32 *mask)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-	int i;
-	enum pin_config_param param;
-	u16 arg;
-
-	for (i = 0; i < num_configs; i++) {
-		param = pinconf_to_config_param(configs[i]);
-		arg = pinconf_to_config_argument(configs[i]);
-
-		switch (param) {
-		case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
-			arg = (arg >= 1 ? 1 : 0);
-			bcm281xx_pin_update(val, mask, arg,
-				BCM281XX_PIN_SHIFT(STD, HYST),
-				BCM281XX_PIN_MASK(STD, HYST));
-			break;
-		/*
-		 * The pin bias can only be one of pull-up, pull-down, or
-		 * disable.  The user does not need to specify a value for the
-		 * property, and the default value from pinconf-generic is
-		 * ignored.
-		 */
-		case PIN_CONFIG_BIAS_DISABLE:
-			bcm281xx_pin_update(val, mask, 0,
-				BCM281XX_PIN_SHIFT(STD, PULL_UP),
-				BCM281XX_PIN_MASK(STD, PULL_UP));
-			bcm281xx_pin_update(val, mask, 0,
-				BCM281XX_PIN_SHIFT(STD, PULL_DN),
-				BCM281XX_PIN_MASK(STD, PULL_DN));
-			break;
-
-		case PIN_CONFIG_BIAS_PULL_UP:
-			bcm281xx_pin_update(val, mask, 1,
-				BCM281XX_PIN_SHIFT(STD, PULL_UP),
-				BCM281XX_PIN_MASK(STD, PULL_UP));
-			bcm281xx_pin_update(val, mask, 0,
-				BCM281XX_PIN_SHIFT(STD, PULL_DN),
-				BCM281XX_PIN_MASK(STD, PULL_DN));
-			break;
-
-		case PIN_CONFIG_BIAS_PULL_DOWN:
-			bcm281xx_pin_update(val, mask, 0,
-				BCM281XX_PIN_SHIFT(STD, PULL_UP),
-				BCM281XX_PIN_MASK(STD, PULL_UP));
-			bcm281xx_pin_update(val, mask, 1,
-				BCM281XX_PIN_SHIFT(STD, PULL_DN),
-				BCM281XX_PIN_MASK(STD, PULL_DN));
-			break;
-
-		case PIN_CONFIG_SLEW_RATE:
-			arg = (arg >= 1 ? 1 : 0);
-			bcm281xx_pin_update(val, mask, arg,
-				BCM281XX_PIN_SHIFT(STD, SLEW),
-				BCM281XX_PIN_MASK(STD, SLEW));
-			break;
-
-		case PIN_CONFIG_INPUT_ENABLE:
-			/* inversed since register is for input _disable_ */
-			arg = (arg >= 1 ? 0 : 1);
-			bcm281xx_pin_update(val, mask, arg,
-				BCM281XX_PIN_SHIFT(STD, INPUT_DIS),
-				BCM281XX_PIN_MASK(STD, INPUT_DIS));
-			break;
-
-		case PIN_CONFIG_DRIVE_STRENGTH:
-			/* Valid range is 2-16 mA, even numbers only */
-			if ((arg < 2) || (arg > 16) || (arg % 2)) {
-				dev_err(pctldev->dev,
-					"Invalid Drive Strength value (%d) for "
-					"pin %s (%d). Valid values are "
-					"(2..16) mA, even numbers only.\n",
-					arg, pdata->pins[pin].name, pin);
-				return -EINVAL;
-			}
-			bcm281xx_pin_update(val, mask, (arg/2)-1,
-				BCM281XX_PIN_SHIFT(STD, DRV_STR),
-				BCM281XX_PIN_MASK(STD, DRV_STR));
-			break;
-
-		default:
-			dev_err(pctldev->dev,
-				"Unrecognized pin config %d for pin %s (%d).\n",
-				param, pdata->pins[pin].name, pin);
-			return -EINVAL;
-
-		} /* switch config */
-	} /* for each config */
-
-	return 0;
-}
-
-/*
- * The pull-up strength for an I2C pin is represented by bits 4-6 in the
- * register with the following mapping:
- *   0b000: No pull-up
- *   0b001: 1200 Ohm
- *   0b010: 1800 Ohm
- *   0b011: 720 Ohm
- *   0b100: 2700 Ohm
- *   0b101: 831 Ohm
- *   0b110: 1080 Ohm
- *   0b111: 568 Ohm
- * This array maps pull-up strength in Ohms to register values (1+index).
- */
-static const u16 bcm281xx_pullup_map[] = {
-	1200, 1800, 720, 2700, 831, 1080, 568
-};
-
-/* Goes through the configs and update register val/mask */
-static int bcm281xx_i2c_pin_update(struct pinctrl_dev *pctldev,
-				   unsigned pin,
-				   unsigned long *configs,
-				   unsigned num_configs,
-				   u32 *val,
-				   u32 *mask)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-	int i, j;
-	enum pin_config_param param;
-	u16 arg;
-
-	for (i = 0; i < num_configs; i++) {
-		param = pinconf_to_config_param(configs[i]);
-		arg = pinconf_to_config_argument(configs[i]);
-
-		switch (param) {
-		case PIN_CONFIG_BIAS_PULL_UP:
-			for (j = 0; j < ARRAY_SIZE(bcm281xx_pullup_map); j++)
-				if (bcm281xx_pullup_map[j] == arg)
-					break;
-
-			if (j == ARRAY_SIZE(bcm281xx_pullup_map)) {
-				dev_err(pctldev->dev,
-					"Invalid pull-up value (%d) for pin %s "
-					"(%d). Valid values are 568, 720, 831, "
-					"1080, 1200, 1800, 2700 Ohms.\n",
-					arg, pdata->pins[pin].name, pin);
-				return -EINVAL;
-			}
-
-			bcm281xx_pin_update(val, mask, j+1,
-				BCM281XX_PIN_SHIFT(I2C, PULL_UP_STR),
-				BCM281XX_PIN_MASK(I2C, PULL_UP_STR));
-			break;
-
-		case PIN_CONFIG_BIAS_DISABLE:
-			bcm281xx_pin_update(val, mask, 0,
-				BCM281XX_PIN_SHIFT(I2C, PULL_UP_STR),
-				BCM281XX_PIN_MASK(I2C, PULL_UP_STR));
-			break;
-
-		case PIN_CONFIG_SLEW_RATE:
-			arg = (arg >= 1 ? 1 : 0);
-			bcm281xx_pin_update(val, mask, arg,
-				BCM281XX_PIN_SHIFT(I2C, SLEW),
-				BCM281XX_PIN_MASK(I2C, SLEW));
-			break;
-
-		case PIN_CONFIG_INPUT_ENABLE:
-			/* inversed since register is for input _disable_ */
-			arg = (arg >= 1 ? 0 : 1);
-			bcm281xx_pin_update(val, mask, arg,
-				BCM281XX_PIN_SHIFT(I2C, INPUT_DIS),
-				BCM281XX_PIN_MASK(I2C, INPUT_DIS));
-			break;
-
-		default:
-			dev_err(pctldev->dev,
-				"Unrecognized pin config %d for pin %s (%d).\n",
-				param, pdata->pins[pin].name, pin);
-			return -EINVAL;
-
-		} /* switch config */
-	} /* for each config */
-
-	return 0;
-}
-
-/* Goes through the configs and update register val/mask */
-static int bcm281xx_hdmi_pin_update(struct pinctrl_dev *pctldev,
-				    unsigned pin,
-				    unsigned long *configs,
-				    unsigned num_configs,
-				    u32 *val,
-				    u32 *mask)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-	int i;
-	enum pin_config_param param;
-	u16 arg;
-
-	for (i = 0; i < num_configs; i++) {
-		param = pinconf_to_config_param(configs[i]);
-		arg = pinconf_to_config_argument(configs[i]);
-
-		switch (param) {
-		case PIN_CONFIG_SLEW_RATE:
-			arg = (arg >= 1 ? 1 : 0);
-			bcm281xx_pin_update(val, mask, arg,
-				BCM281XX_PIN_SHIFT(HDMI, MODE),
-				BCM281XX_PIN_MASK(HDMI, MODE));
-			break;
-
-		case PIN_CONFIG_INPUT_ENABLE:
-			/* inversed since register is for input _disable_ */
-			arg = (arg >= 1 ? 0 : 1);
-			bcm281xx_pin_update(val, mask, arg,
-				BCM281XX_PIN_SHIFT(HDMI, INPUT_DIS),
-				BCM281XX_PIN_MASK(HDMI, INPUT_DIS));
-			break;
-
-		default:
-			dev_err(pctldev->dev,
-				"Unrecognized pin config %d for pin %s (%d).\n",
-				param, pdata->pins[pin].name, pin);
-			return -EINVAL;
-
-		} /* switch config */
-	} /* for each config */
-
-	return 0;
-}
-
-static int bcm281xx_pinctrl_pin_config_set(struct pinctrl_dev *pctldev,
-					   unsigned pin,
-					   unsigned long *configs,
-					   unsigned num_configs)
-{
-	struct bcm281xx_pinctrl_data *pdata = pinctrl_dev_get_drvdata(pctldev);
-	enum bcm281xx_pin_type pin_type;
-	u32 offset = 4 * pin;
-	u32 cfg_val, cfg_mask;
-	int rc;
-
-	cfg_val = 0;
-	cfg_mask = 0;
-	pin_type = pin_type_get(pctldev, pin);
-
-	/* Different pins have different configuration options */
-	switch (pin_type) {
-	case BCM281XX_PIN_TYPE_STD:
-		rc = bcm281xx_std_pin_update(pctldev, pin, configs,
-			num_configs, &cfg_val, &cfg_mask);
-		break;
-
-	case BCM281XX_PIN_TYPE_I2C:
-		rc = bcm281xx_i2c_pin_update(pctldev, pin, configs,
-			num_configs, &cfg_val, &cfg_mask);
-		break;
-
-	case BCM281XX_PIN_TYPE_HDMI:
-		rc = bcm281xx_hdmi_pin_update(pctldev, pin, configs,
-			num_configs, &cfg_val, &cfg_mask);
-		break;
-
-	default:
-		dev_err(pctldev->dev, "Unknown pin type for pin %s (%d).\n",
-			pdata->pins[pin].name, pin);
-		return -EINVAL;
-
-	} /* switch pin type */
-
-	if (rc)
-		return rc;
-
-	dev_dbg(pctldev->dev,
-		"%s(): Set pin %s (%d) with config 0x%x, mask 0x%x\n",
-		__func__, pdata->pins[pin].name, pin, cfg_val, cfg_mask);
-
-	rc = regmap_update_bits(pdata->regmap, offset, cfg_mask, cfg_val);
-	if (rc) {
-		dev_err(pctldev->dev,
-			"Error updating register for pin %s (%d).\n",
-			pdata->pins[pin].name, pin);
-		return rc;
-	}
-
-	return 0;
-}
-
-static struct pinconf_ops bcm281xx_pinctrl_pinconf_ops = {
-	.pin_config_get = bcm281xx_pinctrl_pin_config_get,
-	.pin_config_set = bcm281xx_pinctrl_pin_config_set,
-};
-
-static struct pinctrl_desc bcm281xx_pinctrl_desc = {
-	/* name, pins, npins members initialized in probe function */
-	.pctlops = &bcm281xx_pinctrl_ops,
-	.pmxops = &bcm281xx_pinctrl_pinmux_ops,
-	.confops = &bcm281xx_pinctrl_pinconf_ops,
-	.owner = THIS_MODULE,
-};
-
-static int __init bcm281xx_pinctrl_probe(struct platform_device *pdev)
-{
-	struct bcm281xx_pinctrl_data *pdata = &bcm281xx_pinctrl;
-	struct resource *res;
-	struct pinctrl_dev *pctl;
-
-	/* So far We can assume there is only 1 bank of registers */
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	pdata->reg_base = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(pdata->reg_base)) {
-		dev_err(&pdev->dev, "Failed to ioremap MEM resource\n");
-		return -ENODEV;
-	}
-
-	/* Initialize the dynamic part of pinctrl_desc */
-	pdata->regmap = devm_regmap_init_mmio(&pdev->dev, pdata->reg_base,
-		&bcm281xx_pinctrl_regmap_config);
-	if (IS_ERR(pdata->regmap)) {
-		dev_err(&pdev->dev, "Regmap MMIO init failed.\n");
-		return -ENODEV;
-	}
-
-	bcm281xx_pinctrl_desc.name = dev_name(&pdev->dev);
-	bcm281xx_pinctrl_desc.pins = bcm281xx_pinctrl.pins;
-	bcm281xx_pinctrl_desc.npins = bcm281xx_pinctrl.npins;
-
-	pctl = pinctrl_register(&bcm281xx_pinctrl_desc,
-				&pdev->dev,
-				pdata);
-	if (!pctl) {
-		dev_err(&pdev->dev, "Failed to register pinctrl\n");
-		return -ENODEV;
-	}
-
-	platform_set_drvdata(pdev, pdata);
-
-	return 0;
-}
-
-static struct of_device_id bcm281xx_pinctrl_of_match[] = {
-	{ .compatible = "brcm,bcm11351-pinctrl", },
-	{ },
-};
-
-static struct platform_driver bcm281xx_pinctrl_driver = {
-	.driver = {
-		.name = "bcm281xx-pinctrl",
-		.of_match_table = bcm281xx_pinctrl_of_match,
-	},
-};
-
-module_platform_driver_probe(bcm281xx_pinctrl_driver, bcm281xx_pinctrl_probe);
-
-MODULE_AUTHOR("Broadcom Corporation <bcm-kernel-feedback-list@broadcom.com>");
-MODULE_AUTHOR("Sherman Yin <syin@broadcom.com>");
-MODULE_DESCRIPTION("Broadcom BCM281xx pinctrl driver");
-MODULE_LICENSE("GPL v2");
diff --git a/drivers/pinctrl/pinctrl-bcm2835.c b/drivers/pinctrl/pinctrl-bcm2835.c
deleted file mode 100644
index 9aa8a3f..0000000
--- a/drivers/pinctrl/pinctrl-bcm2835.c
+++ /dev/null
@@ -1,1072 +0,0 @@
-/*
- * Driver for Broadcom BCM2835 GPIO unit (pinctrl + GPIO)
- *
- * Copyright (C) 2012 Chris Boot, Simon Arlott, Stephen Warren
- *
- * This driver is inspired by:
- * pinctrl-nomadik.c, please see original file for copyright information
- * pinctrl-tegra.c, please see original file for copyright information
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
-
-#include <linux/bitmap.h>
-#include <linux/bug.h>
-#include <linux/delay.h>
-#include <linux/device.h>
-#include <linux/err.h>
-#include <linux/gpio.h>
-#include <linux/interrupt.h>
-#include <linux/io.h>
-#include <linux/irq.h>
-#include <linux/irqdesc.h>
-#include <linux/irqdomain.h>
-#include <linux/module.h>
-#include <linux/of_address.h>
-#include <linux/of.h>
-#include <linux/of_irq.h>
-#include <linux/pinctrl/consumer.h>
-#include <linux/pinctrl/machine.h>
-#include <linux/pinctrl/pinconf.h>
-#include <linux/pinctrl/pinctrl.h>
-#include <linux/pinctrl/pinmux.h>
-#include <linux/platform_device.h>
-#include <linux/seq_file.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
-#include <linux/types.h>
-
-#define MODULE_NAME "pinctrl-bcm2835"
-#define BCM2835_NUM_GPIOS 54
-#define BCM2835_NUM_BANKS 2
-
-#define BCM2835_PIN_BITMAP_SZ \
-	DIV_ROUND_UP(BCM2835_NUM_GPIOS, sizeof(unsigned long) * 8)
-
-/* GPIO register offsets */
-#define GPFSEL0		0x0	/* Function Select */
-#define GPSET0		0x1c	/* Pin Output Set */
-#define GPCLR0		0x28	/* Pin Output Clear */
-#define GPLEV0		0x34	/* Pin Level */
-#define GPEDS0		0x40	/* Pin Event Detect Status */
-#define GPREN0		0x4c	/* Pin Rising Edge Detect Enable */
-#define GPFEN0		0x58	/* Pin Falling Edge Detect Enable */
-#define GPHEN0		0x64	/* Pin High Detect Enable */
-#define GPLEN0		0x70	/* Pin Low Detect Enable */
-#define GPAREN0		0x7c	/* Pin Async Rising Edge Detect */
-#define GPAFEN0		0x88	/* Pin Async Falling Edge Detect */
-#define GPPUD		0x94	/* Pin Pull-up/down Enable */
-#define GPPUDCLK0	0x98	/* Pin Pull-up/down Enable Clock */
-
-#define FSEL_REG(p)		(GPFSEL0 + (((p) / 10) * 4))
-#define FSEL_SHIFT(p)		(((p) % 10) * 3)
-#define GPIO_REG_OFFSET(p)	((p) / 32)
-#define GPIO_REG_SHIFT(p)	((p) % 32)
-
-enum bcm2835_pinconf_param {
-	/* argument: bcm2835_pinconf_pull */
-	BCM2835_PINCONF_PARAM_PULL,
-};
-
-enum bcm2835_pinconf_pull {
-	BCM2835_PINCONFIG_PULL_NONE,
-	BCM2835_PINCONFIG_PULL_DOWN,
-	BCM2835_PINCONFIG_PULL_UP,
-};
-
-#define BCM2835_PINCONF_PACK(_param_, _arg_) ((_param_) << 16 | (_arg_))
-#define BCM2835_PINCONF_UNPACK_PARAM(_conf_) ((_conf_) >> 16)
-#define BCM2835_PINCONF_UNPACK_ARG(_conf_) ((_conf_) & 0xffff)
-
-struct bcm2835_gpio_irqdata {
-	struct bcm2835_pinctrl *pc;
-	int bank;
-};
-
-struct bcm2835_pinctrl {
-	struct device *dev;
-	void __iomem *base;
-	int irq[BCM2835_NUM_BANKS];
-
-	/* note: locking assumes each bank will have its own unsigned long */
-	unsigned long enabled_irq_map[BCM2835_NUM_BANKS];
-	unsigned int irq_type[BCM2835_NUM_GPIOS];
-
-	struct pinctrl_dev *pctl_dev;
-	struct irq_domain *irq_domain;
-	struct gpio_chip gpio_chip;
-	struct pinctrl_gpio_range gpio_range;
-
-	struct bcm2835_gpio_irqdata irq_data[BCM2835_NUM_BANKS];
-	spinlock_t irq_lock[BCM2835_NUM_BANKS];
-};
-
-static struct lock_class_key gpio_lock_class;
-
-/* pins are just named GPIO0..GPIO53 */
-#define BCM2835_GPIO_PIN(a) PINCTRL_PIN(a, "gpio" #a)
-static struct pinctrl_pin_desc bcm2835_gpio_pins[] = {
-	BCM2835_GPIO_PIN(0),
-	BCM2835_GPIO_PIN(1),
-	BCM2835_GPIO_PIN(2),
-	BCM2835_GPIO_PIN(3),
-	BCM2835_GPIO_PIN(4),
-	BCM2835_GPIO_PIN(5),
-	BCM2835_GPIO_PIN(6),
-	BCM2835_GPIO_PIN(7),
-	BCM2835_GPIO_PIN(8),
-	BCM2835_GPIO_PIN(9),
-	BCM2835_GPIO_PIN(10),
-	BCM2835_GPIO_PIN(11),
-	BCM2835_GPIO_PIN(12),
-	BCM2835_GPIO_PIN(13),
-	BCM2835_GPIO_PIN(14),
-	BCM2835_GPIO_PIN(15),
-	BCM2835_GPIO_PIN(16),
-	BCM2835_GPIO_PIN(17),
-	BCM2835_GPIO_PIN(18),
-	BCM2835_GPIO_PIN(19),
-	BCM2835_GPIO_PIN(20),
-	BCM2835_GPIO_PIN(21),
-	BCM2835_GPIO_PIN(22),
-	BCM2835_GPIO_PIN(23),
-	BCM2835_GPIO_PIN(24),
-	BCM2835_GPIO_PIN(25),
-	BCM2835_GPIO_PIN(26),
-	BCM2835_GPIO_PIN(27),
-	BCM2835_GPIO_PIN(28),
-	BCM2835_GPIO_PIN(29),
-	BCM2835_GPIO_PIN(30),
-	BCM2835_GPIO_PIN(31),
-	BCM2835_GPIO_PIN(32),
-	BCM2835_GPIO_PIN(33),
-	BCM2835_GPIO_PIN(34),
-	BCM2835_GPIO_PIN(35),
-	BCM2835_GPIO_PIN(36),
-	BCM2835_GPIO_PIN(37),
-	BCM2835_GPIO_PIN(38),
-	BCM2835_GPIO_PIN(39),
-	BCM2835_GPIO_PIN(40),
-	BCM2835_GPIO_PIN(41),
-	BCM2835_GPIO_PIN(42),
-	BCM2835_GPIO_PIN(43),
-	BCM2835_GPIO_PIN(44),
-	BCM2835_GPIO_PIN(45),
-	BCM2835_GPIO_PIN(46),
-	BCM2835_GPIO_PIN(47),
-	BCM2835_GPIO_PIN(48),
-	BCM2835_GPIO_PIN(49),
-	BCM2835_GPIO_PIN(50),
-	BCM2835_GPIO_PIN(51),
-	BCM2835_GPIO_PIN(52),
-	BCM2835_GPIO_PIN(53),
-};
-
-/* one pin per group */
-static const char * const bcm2835_gpio_groups[] = {
-	"gpio0",
-	"gpio1",
-	"gpio2",
-	"gpio3",
-	"gpio4",
-	"gpio5",
-	"gpio6",
-	"gpio7",
-	"gpio8",
-	"gpio9",
-	"gpio10",
-	"gpio11",
-	"gpio12",
-	"gpio13",
-	"gpio14",
-	"gpio15",
-	"gpio16",
-	"gpio17",
-	"gpio18",
-	"gpio19",
-	"gpio20",
-	"gpio21",
-	"gpio22",
-	"gpio23",
-	"gpio24",
-	"gpio25",
-	"gpio26",
-	"gpio27",
-	"gpio28",
-	"gpio29",
-	"gpio30",
-	"gpio31",
-	"gpio32",
-	"gpio33",
-	"gpio34",
-	"gpio35",
-	"gpio36",
-	"gpio37",
-	"gpio38",
-	"gpio39",
-	"gpio40",
-	"gpio41",
-	"gpio42",
-	"gpio43",
-	"gpio44",
-	"gpio45",
-	"gpio46",
-	"gpio47",
-	"gpio48",
-	"gpio49",
-	"gpio50",
-	"gpio51",
-	"gpio52",
-	"gpio53",
-};
-
-enum bcm2835_fsel {
-	BCM2835_FSEL_GPIO_IN = 0,
-	BCM2835_FSEL_GPIO_OUT = 1,
-	BCM2835_FSEL_ALT0 = 4,
-	BCM2835_FSEL_ALT1 = 5,
-	BCM2835_FSEL_ALT2 = 6,
-	BCM2835_FSEL_ALT3 = 7,
-	BCM2835_FSEL_ALT4 = 3,
-	BCM2835_FSEL_ALT5 = 2,
-	BCM2835_FSEL_COUNT = 8,
-	BCM2835_FSEL_MASK = 0x7,
-};
-
-static const char * const bcm2835_functions[BCM2835_FSEL_COUNT] = {
-	[BCM2835_FSEL_GPIO_IN] = "gpio_in",
-	[BCM2835_FSEL_GPIO_OUT] = "gpio_out",
-	[BCM2835_FSEL_ALT0] = "alt0",
-	[BCM2835_FSEL_ALT1] = "alt1",
-	[BCM2835_FSEL_ALT2] = "alt2",
-	[BCM2835_FSEL_ALT3] = "alt3",
-	[BCM2835_FSEL_ALT4] = "alt4",
-	[BCM2835_FSEL_ALT5] = "alt5",
-};
-
-static const char * const irq_type_names[] = {
-	[IRQ_TYPE_NONE] = "none",
-	[IRQ_TYPE_EDGE_RISING] = "edge-rising",
-	[IRQ_TYPE_EDGE_FALLING] = "edge-falling",
-	[IRQ_TYPE_EDGE_BOTH] = "edge-both",
-	[IRQ_TYPE_LEVEL_HIGH] = "level-high",
-	[IRQ_TYPE_LEVEL_LOW] = "level-low",
-};
-
-static inline u32 bcm2835_gpio_rd(struct bcm2835_pinctrl *pc, unsigned reg)
-{
-	return readl(pc->base + reg);
-}
-
-static inline void bcm2835_gpio_wr(struct bcm2835_pinctrl *pc, unsigned reg,
-		u32 val)
-{
-	writel(val, pc->base + reg);
-}
-
-static inline int bcm2835_gpio_get_bit(struct bcm2835_pinctrl *pc, unsigned reg,
-		unsigned bit)
-{
-	reg += GPIO_REG_OFFSET(bit) * 4;
-	return (bcm2835_gpio_rd(pc, reg) >> GPIO_REG_SHIFT(bit)) & 1;
-}
-
-/* note NOT a read/modify/write cycle */
-static inline void bcm2835_gpio_set_bit(struct bcm2835_pinctrl *pc,
-		unsigned reg, unsigned bit)
-{
-	reg += GPIO_REG_OFFSET(bit) * 4;
-	bcm2835_gpio_wr(pc, reg, BIT(GPIO_REG_SHIFT(bit)));
-}
-
-static inline enum bcm2835_fsel bcm2835_pinctrl_fsel_get(
-		struct bcm2835_pinctrl *pc, unsigned pin)
-{
-	u32 val = bcm2835_gpio_rd(pc, FSEL_REG(pin));
-	enum bcm2835_fsel status = (val >> FSEL_SHIFT(pin)) & BCM2835_FSEL_MASK;
-
-	dev_dbg(pc->dev, "get %08x (%u => %s)\n", val, pin,
-			bcm2835_functions[status]);
-
-	return status;
-}
-
-static inline void bcm2835_pinctrl_fsel_set(
-		struct bcm2835_pinctrl *pc, unsigned pin,
-		enum bcm2835_fsel fsel)
-{
-	u32 val = bcm2835_gpio_rd(pc, FSEL_REG(pin));
-	enum bcm2835_fsel cur = (val >> FSEL_SHIFT(pin)) & BCM2835_FSEL_MASK;
-
-	dev_dbg(pc->dev, "read %08x (%u => %s)\n", val, pin,
-			bcm2835_functions[cur]);
-
-	if (cur == fsel)
-		return;
-
-	if (cur != BCM2835_FSEL_GPIO_IN && fsel != BCM2835_FSEL_GPIO_IN) {
-		/* always transition through GPIO_IN */
-		val &= ~(BCM2835_FSEL_MASK << FSEL_SHIFT(pin));
-		val |= BCM2835_FSEL_GPIO_IN << FSEL_SHIFT(pin);
-
-		dev_dbg(pc->dev, "trans %08x (%u <= %s)\n", val, pin,
-				bcm2835_functions[BCM2835_FSEL_GPIO_IN]);
-		bcm2835_gpio_wr(pc, FSEL_REG(pin), val);
-	}
-
-	val &= ~(BCM2835_FSEL_MASK << FSEL_SHIFT(pin));
-	val |= fsel << FSEL_SHIFT(pin);
-
-	dev_dbg(pc->dev, "write %08x (%u <= %s)\n", val, pin,
-			bcm2835_functions[fsel]);
-	bcm2835_gpio_wr(pc, FSEL_REG(pin), val);
-}
-
-static int bcm2835_gpio_request(struct gpio_chip *chip, unsigned offset)
-{
-	return pinctrl_request_gpio(chip->base + offset);
-}
-
-static void bcm2835_gpio_free(struct gpio_chip *chip, unsigned offset)
-{
-	pinctrl_free_gpio(chip->base + offset);
-}
-
-static int bcm2835_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
-{
-	return pinctrl_gpio_direction_input(chip->base + offset);
-}
-
-static int bcm2835_gpio_get(struct gpio_chip *chip, unsigned offset)
-{
-	struct bcm2835_pinctrl *pc = dev_get_drvdata(chip->dev);
-
-	return bcm2835_gpio_get_bit(pc, GPLEV0, offset);
-}
-
-static int bcm2835_gpio_direction_output(struct gpio_chip *chip,
-		unsigned offset, int value)
-{
-	return pinctrl_gpio_direction_output(chip->base + offset);
-}
-
-static void bcm2835_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
-{
-	struct bcm2835_pinctrl *pc = dev_get_drvdata(chip->dev);
-
-	bcm2835_gpio_set_bit(pc, value ? GPSET0 : GPCLR0, offset);
-}
-
-static int bcm2835_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
-{
-	struct bcm2835_pinctrl *pc = dev_get_drvdata(chip->dev);
-
-	return irq_linear_revmap(pc->irq_domain, offset);
-}
-
-static struct gpio_chip bcm2835_gpio_chip = {
-	.label = MODULE_NAME,
-	.owner = THIS_MODULE,
-	.request = bcm2835_gpio_request,
-	.free = bcm2835_gpio_free,
-	.direction_input = bcm2835_gpio_direction_input,
-	.direction_output = bcm2835_gpio_direction_output,
-	.get = bcm2835_gpio_get,
-	.set = bcm2835_gpio_set,
-	.to_irq = bcm2835_gpio_to_irq,
-	.base = -1,
-	.ngpio = BCM2835_NUM_GPIOS,
-	.can_sleep = false,
-};
-
-static irqreturn_t bcm2835_gpio_irq_handler(int irq, void *dev_id)
-{
-	struct bcm2835_gpio_irqdata *irqdata = dev_id;
-	struct bcm2835_pinctrl *pc = irqdata->pc;
-	int bank = irqdata->bank;
-	unsigned long events;
-	unsigned offset;
-	unsigned gpio;
-	unsigned int type;
-
-	events = bcm2835_gpio_rd(pc, GPEDS0 + bank * 4);
-	events &= pc->enabled_irq_map[bank];
-	for_each_set_bit(offset, &events, 32) {
-		gpio = (32 * bank) + offset;
-		type = pc->irq_type[gpio];
-
-		/* ack edge triggered IRQs immediately */
-		if (!(type & IRQ_TYPE_LEVEL_MASK))
-			bcm2835_gpio_set_bit(pc, GPEDS0, gpio);
-
-		generic_handle_irq(irq_linear_revmap(pc->irq_domain, gpio));
-
-		/* ack level triggered IRQ after handling them */
-		if (type & IRQ_TYPE_LEVEL_MASK)
-			bcm2835_gpio_set_bit(pc, GPEDS0, gpio);
-	}
-	return events ? IRQ_HANDLED : IRQ_NONE;
-}
-
-static inline void __bcm2835_gpio_irq_config(struct bcm2835_pinctrl *pc,
-	unsigned reg, unsigned offset, bool enable)
-{
-	u32 value;
-	reg += GPIO_REG_OFFSET(offset) * 4;
-	value = bcm2835_gpio_rd(pc, reg);
-	if (enable)
-		value |= BIT(GPIO_REG_SHIFT(offset));
-	else
-		value &= ~(BIT(GPIO_REG_SHIFT(offset)));
-	bcm2835_gpio_wr(pc, reg, value);
-}
-
-/* fast path for IRQ handler */
-static void bcm2835_gpio_irq_config(struct bcm2835_pinctrl *pc,
-	unsigned offset, bool enable)
-{
-	switch (pc->irq_type[offset]) {
-	case IRQ_TYPE_EDGE_RISING:
-		__bcm2835_gpio_irq_config(pc, GPREN0, offset, enable);
-		break;
-
-	case IRQ_TYPE_EDGE_FALLING:
-		__bcm2835_gpio_irq_config(pc, GPFEN0, offset, enable);
-		break;
-
-	case IRQ_TYPE_EDGE_BOTH:
-		__bcm2835_gpio_irq_config(pc, GPREN0, offset, enable);
-		__bcm2835_gpio_irq_config(pc, GPFEN0, offset, enable);
-		break;
-
-	case IRQ_TYPE_LEVEL_HIGH:
-		__bcm2835_gpio_irq_config(pc, GPHEN0, offset, enable);
-		break;
-
-	case IRQ_TYPE_LEVEL_LOW:
-		__bcm2835_gpio_irq_config(pc, GPLEN0, offset, enable);
-		break;
-	}
-}
-
-static void bcm2835_gpio_irq_enable(struct irq_data *data)
-{
-	struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data);
-	unsigned gpio = irqd_to_hwirq(data);
-	unsigned offset = GPIO_REG_SHIFT(gpio);
-	unsigned bank = GPIO_REG_OFFSET(gpio);
-	unsigned long flags;
-
-	spin_lock_irqsave(&pc->irq_lock[bank], flags);
-	set_bit(offset, &pc->enabled_irq_map[bank]);
-	bcm2835_gpio_irq_config(pc, gpio, true);
-	spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
-}
-
-static void bcm2835_gpio_irq_disable(struct irq_data *data)
-{
-	struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data);
-	unsigned gpio = irqd_to_hwirq(data);
-	unsigned offset = GPIO_REG_SHIFT(gpio);
-	unsigned bank = GPIO_REG_OFFSET(gpio);
-	unsigned long flags;
-
-	spin_lock_irqsave(&pc->irq_lock[bank], flags);
-	bcm2835_gpio_irq_config(pc, gpio, false);
-	clear_bit(offset, &pc->enabled_irq_map[bank]);
-	spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
-}
-
-static int __bcm2835_gpio_irq_set_type_disabled(struct bcm2835_pinctrl *pc,
-	unsigned offset, unsigned int type)
-{
-	switch (type) {
-	case IRQ_TYPE_NONE:
-	case IRQ_TYPE_EDGE_RISING:
-	case IRQ_TYPE_EDGE_FALLING:
-	case IRQ_TYPE_EDGE_BOTH:
-	case IRQ_TYPE_LEVEL_HIGH:
-	case IRQ_TYPE_LEVEL_LOW:
-		pc->irq_type[offset] = type;
-		break;
-
-	default:
-		return -EINVAL;
-	}
-	return 0;
-}
-
-/* slower path for reconfiguring IRQ type */
-static int __bcm2835_gpio_irq_set_type_enabled(struct bcm2835_pinctrl *pc,
-	unsigned offset, unsigned int type)
-{
-	switch (type) {
-	case IRQ_TYPE_NONE:
-		if (pc->irq_type[offset] != type) {
-			bcm2835_gpio_irq_config(pc, offset, false);
-			pc->irq_type[offset] = type;
-		}
-		break;
-
-	case IRQ_TYPE_EDGE_RISING:
-		if (pc->irq_type[offset] == IRQ_TYPE_EDGE_BOTH) {
-			/* RISING already enabled, disable FALLING */
-			pc->irq_type[offset] = IRQ_TYPE_EDGE_FALLING;
-			bcm2835_gpio_irq_config(pc, offset, false);
-			pc->irq_type[offset] = type;
-		} else if (pc->irq_type[offset] != type) {
-			bcm2835_gpio_irq_config(pc, offset, false);
-			pc->irq_type[offset] = type;
-			bcm2835_gpio_irq_config(pc, offset, true);
-		}
-		break;
-
-	case IRQ_TYPE_EDGE_FALLING:
-		if (pc->irq_type[offset] == IRQ_TYPE_EDGE_BOTH) {
-			/* FALLING already enabled, disable RISING */
-			pc->irq_type[offset] = IRQ_TYPE_EDGE_RISING;
-			bcm2835_gpio_irq_config(pc, offset, false);
-			pc->irq_type[offset] = type;
-		} else if (pc->irq_type[offset] != type) {
-			bcm2835_gpio_irq_config(pc, offset, false);
-			pc->irq_type[offset] = type;
-			bcm2835_gpio_irq_config(pc, offset, true);
-		}
-		break;
-
-	case IRQ_TYPE_EDGE_BOTH:
-		if (pc->irq_type[offset] == IRQ_TYPE_EDGE_RISING) {
-			/* RISING already enabled, enable FALLING too */
-			pc->irq_type[offset] = IRQ_TYPE_EDGE_FALLING;
-			bcm2835_gpio_irq_config(pc, offset, true);
-			pc->irq_type[offset] = type;
-		} else if (pc->irq_type[offset] == IRQ_TYPE_EDGE_FALLING) {
-			/* FALLING already enabled, enable RISING too */
-			pc->irq_type[offset] = IRQ_TYPE_EDGE_RISING;
-			bcm2835_gpio_irq_config(pc, offset, true);
-			pc->irq_type[offset] = type;
-		} else if (pc->irq_type[offset] != type) {
-			bcm2835_gpio_irq_config(pc, offset, false);
-			pc->irq_type[offset] = type;
-			bcm2835_gpio_irq_config(pc, offset, true);
-		}
-		break;
-
-	case IRQ_TYPE_LEVEL_HIGH:
-	case IRQ_TYPE_LEVEL_LOW:
-		if (pc->irq_type[offset] != type) {
-			bcm2835_gpio_irq_config(pc, offset, false);
-			pc->irq_type[offset] = type;
-			bcm2835_gpio_irq_config(pc, offset, true);
-		}
-		break;
-
-	default:
-		return -EINVAL;
-	}
-	return 0;
-}
-
-static int bcm2835_gpio_irq_set_type(struct irq_data *data, unsigned int type)
-{
-	struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data);
-	unsigned gpio = irqd_to_hwirq(data);
-	unsigned offset = GPIO_REG_SHIFT(gpio);
-	unsigned bank = GPIO_REG_OFFSET(gpio);
-	unsigned long flags;
-	int ret;
-
-	spin_lock_irqsave(&pc->irq_lock[bank], flags);
-
-	if (test_bit(offset, &pc->enabled_irq_map[bank]))
-		ret = __bcm2835_gpio_irq_set_type_enabled(pc, gpio, type);
-	else
-		ret = __bcm2835_gpio_irq_set_type_disabled(pc, gpio, type);
-
-	spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
-
-	return ret;
-}
-
-static struct irq_chip bcm2835_gpio_irq_chip = {
-	.name = MODULE_NAME,
-	.irq_enable = bcm2835_gpio_irq_enable,
-	.irq_disable = bcm2835_gpio_irq_disable,
-	.irq_set_type = bcm2835_gpio_irq_set_type,
-};
-
-static int bcm2835_pctl_get_groups_count(struct pinctrl_dev *pctldev)
-{
-	return ARRAY_SIZE(bcm2835_gpio_groups);
-}
-
-static const char *bcm2835_pctl_get_group_name(struct pinctrl_dev *pctldev,
-		unsigned selector)
-{
-	return bcm2835_gpio_groups[selector];
-}
-
-static int bcm2835_pctl_get_group_pins(struct pinctrl_dev *pctldev,
-		unsigned selector,
-		const unsigned **pins,
-		unsigned *num_pins)
-{
-	*pins = &bcm2835_gpio_pins[selector].number;
-	*num_pins = 1;
-
-	return 0;
-}
-
-static void bcm2835_pctl_pin_dbg_show(struct pinctrl_dev *pctldev,
-		struct seq_file *s,
-		unsigned offset)
-{
-	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
-	enum bcm2835_fsel fsel = bcm2835_pinctrl_fsel_get(pc, offset);
-	const char *fname = bcm2835_functions[fsel];
-	int value = bcm2835_gpio_get_bit(pc, GPLEV0, offset);
-	int irq = irq_find_mapping(pc->irq_domain, offset);
-
-	seq_printf(s, "function %s in %s; irq %d (%s)",
-		fname, value ? "hi" : "lo",
-		irq, irq_type_names[pc->irq_type[offset]]);
-}
-
-static void bcm2835_pctl_dt_free_map(struct pinctrl_dev *pctldev,
-		struct pinctrl_map *maps, unsigned num_maps)
-{
-	int i;
-
-	for (i = 0; i < num_maps; i++)
-		if (maps[i].type == PIN_MAP_TYPE_CONFIGS_PIN)
-			kfree(maps[i].data.configs.configs);
-
-	kfree(maps);
-}
-
-static int bcm2835_pctl_dt_node_to_map_func(struct bcm2835_pinctrl *pc,
-		struct device_node *np, u32 pin, u32 fnum,
-		struct pinctrl_map **maps)
-{
-	struct pinctrl_map *map = *maps;
-
-	if (fnum >= ARRAY_SIZE(bcm2835_functions)) {
-		dev_err(pc->dev, "%s: invalid brcm,function %d\n",
-			of_node_full_name(np), fnum);
-		return -EINVAL;
-	}
-
-	map->type = PIN_MAP_TYPE_MUX_GROUP;
-	map->data.mux.group = bcm2835_gpio_groups[pin];
-	map->data.mux.function = bcm2835_functions[fnum];
-	(*maps)++;
-
-	return 0;
-}
-
-static int bcm2835_pctl_dt_node_to_map_pull(struct bcm2835_pinctrl *pc,
-		struct device_node *np, u32 pin, u32 pull,
-		struct pinctrl_map **maps)
-{
-	struct pinctrl_map *map = *maps;
-	unsigned long *configs;
-
-	if (pull > 2) {
-		dev_err(pc->dev, "%s: invalid brcm,pull %d\n",
-			of_node_full_name(np), pull);
-		return -EINVAL;
-	}
-
-	configs = kzalloc(sizeof(*configs), GFP_KERNEL);
-	if (!configs)
-		return -ENOMEM;
-	configs[0] = BCM2835_PINCONF_PACK(BCM2835_PINCONF_PARAM_PULL, pull);
-
-	map->type = PIN_MAP_TYPE_CONFIGS_PIN;
-	map->data.configs.group_or_pin = bcm2835_gpio_pins[pin].name;
-	map->data.configs.configs = configs;
-	map->data.configs.num_configs = 1;
-	(*maps)++;
-
-	return 0;
-}
-
-static int bcm2835_pctl_dt_node_to_map(struct pinctrl_dev *pctldev,
-		struct device_node *np,
-		struct pinctrl_map **map, unsigned *num_maps)
-{
-	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
-	struct property *pins, *funcs, *pulls;
-	int num_pins, num_funcs, num_pulls, maps_per_pin;
-	struct pinctrl_map *maps, *cur_map;
-	int i, err;
-	u32 pin, func, pull;
-
-	pins = of_find_property(np, "brcm,pins", NULL);
-	if (!pins) {
-		dev_err(pc->dev, "%s: missing brcm,pins property\n",
-				of_node_full_name(np));
-		return -EINVAL;
-	}
-
-	funcs = of_find_property(np, "brcm,function", NULL);
-	pulls = of_find_property(np, "brcm,pull", NULL);
-
-	if (!funcs && !pulls) {
-		dev_err(pc->dev,
-			"%s: neither brcm,function nor brcm,pull specified\n",
-			of_node_full_name(np));
-		return -EINVAL;
-	}
-
-	num_pins = pins->length / 4;
-	num_funcs = funcs ? (funcs->length / 4) : 0;
-	num_pulls = pulls ? (pulls->length / 4) : 0;
-
-	if (num_funcs > 1 && num_funcs != num_pins) {
-		dev_err(pc->dev,
-			"%s: brcm,function must have 1 or %d entries\n",
-			of_node_full_name(np), num_pins);
-		return -EINVAL;
-	}
-
-	if (num_pulls > 1 && num_pulls != num_pins) {
-		dev_err(pc->dev,
-			"%s: brcm,pull must have 1 or %d entries\n",
-			of_node_full_name(np), num_pins);
-		return -EINVAL;
-	}
-
-	maps_per_pin = 0;
-	if (num_funcs)
-		maps_per_pin++;
-	if (num_pulls)
-		maps_per_pin++;
-	cur_map = maps = kzalloc(num_pins * maps_per_pin * sizeof(*maps),
-				GFP_KERNEL);
-	if (!maps)
-		return -ENOMEM;
-
-	for (i = 0; i < num_pins; i++) {
-		err = of_property_read_u32_index(np, "brcm,pins", i, &pin);
-		if (err)
-			goto out;
-		if (pin >= ARRAY_SIZE(bcm2835_gpio_pins)) {
-			dev_err(pc->dev, "%s: invalid brcm,pins value %d\n",
-				of_node_full_name(np), pin);
-			err = -EINVAL;
-			goto out;
-		}
-
-		if (num_funcs) {
-			err = of_property_read_u32_index(np, "brcm,function",
-					(num_funcs > 1) ? i : 0, &func);
-			if (err)
-				goto out;
-			err = bcm2835_pctl_dt_node_to_map_func(pc, np, pin,
-							func, &cur_map);
-			if (err)
-				goto out;
-		}
-		if (num_pulls) {
-			err = of_property_read_u32_index(np, "brcm,pull",
-					(num_funcs > 1) ? i : 0, &pull);
-			if (err)
-				goto out;
-			err = bcm2835_pctl_dt_node_to_map_pull(pc, np, pin,
-							pull, &cur_map);
-			if (err)
-				goto out;
-		}
-	}
-
-	*map = maps;
-	*num_maps = num_pins * maps_per_pin;
-
-	return 0;
-
-out:
-	kfree(maps);
-	return err;
-}
-
-static const struct pinctrl_ops bcm2835_pctl_ops = {
-	.get_groups_count = bcm2835_pctl_get_groups_count,
-	.get_group_name = bcm2835_pctl_get_group_name,
-	.get_group_pins = bcm2835_pctl_get_group_pins,
-	.pin_dbg_show = bcm2835_pctl_pin_dbg_show,
-	.dt_node_to_map = bcm2835_pctl_dt_node_to_map,
-	.dt_free_map = bcm2835_pctl_dt_free_map,
-};
-
-static int bcm2835_pmx_get_functions_count(struct pinctrl_dev *pctldev)
-{
-	return BCM2835_FSEL_COUNT;
-}
-
-static const char *bcm2835_pmx_get_function_name(struct pinctrl_dev *pctldev,
-		unsigned selector)
-{
-	return bcm2835_functions[selector];
-}
-
-static int bcm2835_pmx_get_function_groups(struct pinctrl_dev *pctldev,
-		unsigned selector,
-		const char * const **groups,
-		unsigned * const num_groups)
-{
-	/* every pin can do every function */
-	*groups = bcm2835_gpio_groups;
-	*num_groups = ARRAY_SIZE(bcm2835_gpio_groups);
-
-	return 0;
-}
-
-static int bcm2835_pmx_set(struct pinctrl_dev *pctldev,
-		unsigned func_selector,
-		unsigned group_selector)
-{
-	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
-
-	bcm2835_pinctrl_fsel_set(pc, group_selector, func_selector);
-
-	return 0;
-}
-
-static void bcm2835_pmx_gpio_disable_free(struct pinctrl_dev *pctldev,
-		struct pinctrl_gpio_range *range,
-		unsigned offset)
-{
-	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
-
-	/* disable by setting to GPIO_IN */
-	bcm2835_pinctrl_fsel_set(pc, offset, BCM2835_FSEL_GPIO_IN);
-}
-
-static int bcm2835_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
-		struct pinctrl_gpio_range *range,
-		unsigned offset,
-		bool input)
-{
-	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
-	enum bcm2835_fsel fsel = input ?
-		BCM2835_FSEL_GPIO_IN : BCM2835_FSEL_GPIO_OUT;
-
-	bcm2835_pinctrl_fsel_set(pc, offset, fsel);
-
-	return 0;
-}
-
-static const struct pinmux_ops bcm2835_pmx_ops = {
-	.get_functions_count = bcm2835_pmx_get_functions_count,
-	.get_function_name = bcm2835_pmx_get_function_name,
-	.get_function_groups = bcm2835_pmx_get_function_groups,
-	.set_mux = bcm2835_pmx_set,
-	.gpio_disable_free = bcm2835_pmx_gpio_disable_free,
-	.gpio_set_direction = bcm2835_pmx_gpio_set_direction,
-};
-
-static int bcm2835_pinconf_get(struct pinctrl_dev *pctldev,
-			unsigned pin, unsigned long *config)
-{
-	/* No way to read back config in HW */
-	return -ENOTSUPP;
-}
-
-static int bcm2835_pinconf_set(struct pinctrl_dev *pctldev,
-			unsigned pin, unsigned long *configs,
-			unsigned num_configs)
-{
-	struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
-	enum bcm2835_pinconf_param param;
-	u16 arg;
-	u32 off, bit;
-	int i;
-
-	for (i = 0; i < num_configs; i++) {
-		param = BCM2835_PINCONF_UNPACK_PARAM(configs[i]);
-		arg = BCM2835_PINCONF_UNPACK_ARG(configs[i]);
-
-		if (param != BCM2835_PINCONF_PARAM_PULL)
-			return -EINVAL;
-
-		off = GPIO_REG_OFFSET(pin);
-		bit = GPIO_REG_SHIFT(pin);
-
-		bcm2835_gpio_wr(pc, GPPUD, arg & 3);
-		/*
-		 * Docs say to wait 150 cycles, but not of what. We assume a
-		 * 1 MHz clock here, which is pretty slow...
-		 */
-		udelay(150);
-		bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), BIT(bit));
-		udelay(150);
-		bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), 0);
-	} /* for each config */
-
-	return 0;
-}
-
-static const struct pinconf_ops bcm2835_pinconf_ops = {
-	.pin_config_get = bcm2835_pinconf_get,
-	.pin_config_set = bcm2835_pinconf_set,
-};
-
-static struct pinctrl_desc bcm2835_pinctrl_desc = {
-	.name = MODULE_NAME,
-	.pins = bcm2835_gpio_pins,
-	.npins = ARRAY_SIZE(bcm2835_gpio_pins),
-	.pctlops = &bcm2835_pctl_ops,
-	.pmxops = &bcm2835_pmx_ops,
-	.confops = &bcm2835_pinconf_ops,
-	.owner = THIS_MODULE,
-};
-
-static struct pinctrl_gpio_range bcm2835_pinctrl_gpio_range = {
-	.name = MODULE_NAME,
-	.npins = BCM2835_NUM_GPIOS,
-};
-
-static int bcm2835_pinctrl_probe(struct platform_device *pdev)
-{
-	struct device *dev = &pdev->dev;
-	struct device_node *np = dev->of_node;
-	struct bcm2835_pinctrl *pc;
-	struct resource iomem;
-	int err, i;
-	BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_pins) != BCM2835_NUM_GPIOS);
-	BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_groups) != BCM2835_NUM_GPIOS);
-
-	pc = devm_kzalloc(dev, sizeof(*pc), GFP_KERNEL);
-	if (!pc)
-		return -ENOMEM;
-
-	platform_set_drvdata(pdev, pc);
-	pc->dev = dev;
-
-	err = of_address_to_resource(np, 0, &iomem);
-	if (err) {
-		dev_err(dev, "could not get IO memory\n");
-		return err;
-	}
-
-	pc->base = devm_ioremap_resource(dev, &iomem);
-	if (IS_ERR(pc->base))
-		return PTR_ERR(pc->base);
-
-	pc->gpio_chip = bcm2835_gpio_chip;
-	pc->gpio_chip.dev = dev;
-	pc->gpio_chip.of_node = np;
-
-	pc->irq_domain = irq_domain_add_linear(np, BCM2835_NUM_GPIOS,
-			&irq_domain_simple_ops, NULL);
-	if (!pc->irq_domain) {
-		dev_err(dev, "could not create IRQ domain\n");
-		return -ENOMEM;
-	}
-
-	for (i = 0; i < BCM2835_NUM_GPIOS; i++) {
-		int irq = irq_create_mapping(pc->irq_domain, i);
-		irq_set_lockdep_class(irq, &gpio_lock_class);
-		irq_set_chip_and_handler(irq, &bcm2835_gpio_irq_chip,
-				handle_simple_irq);
-		irq_set_chip_data(irq, pc);
-		set_irq_flags(irq, IRQF_VALID);
-	}
-
-	for (i = 0; i < BCM2835_NUM_BANKS; i++) {
-		unsigned long events;
-		unsigned offset;
-		int len;
-		char *name;
-
-		/* clear event detection flags */
-		bcm2835_gpio_wr(pc, GPREN0 + i * 4, 0);
-		bcm2835_gpio_wr(pc, GPFEN0 + i * 4, 0);
-		bcm2835_gpio_wr(pc, GPHEN0 + i * 4, 0);
-		bcm2835_gpio_wr(pc, GPLEN0 + i * 4, 0);
-		bcm2835_gpio_wr(pc, GPAREN0 + i * 4, 0);
-		bcm2835_gpio_wr(pc, GPAFEN0 + i * 4, 0);
-
-		/* clear all the events */
-		events = bcm2835_gpio_rd(pc, GPEDS0 + i * 4);
-		for_each_set_bit(offset, &events, 32)
-			bcm2835_gpio_wr(pc, GPEDS0 + i * 4, BIT(offset));
-
-		pc->irq[i] = irq_of_parse_and_map(np, i);
-		pc->irq_data[i].pc = pc;
-		pc->irq_data[i].bank = i;
-		spin_lock_init(&pc->irq_lock[i]);
-
-		len = strlen(dev_name(pc->dev)) + 16;
-		name = devm_kzalloc(pc->dev, len, GFP_KERNEL);
-		if (!name)
-			return -ENOMEM;
-		snprintf(name, len, "%s:bank%d", dev_name(pc->dev), i);
-
-		err = devm_request_irq(dev, pc->irq[i],
-			bcm2835_gpio_irq_handler, IRQF_SHARED,
-			name, &pc->irq_data[i]);
-		if (err) {
-			dev_err(dev, "unable to request IRQ %d\n", pc->irq[i]);
-			return err;
-		}
-	}
-
-	err = gpiochip_add(&pc->gpio_chip);
-	if (err) {
-		dev_err(dev, "could not add GPIO chip\n");
-		return err;
-	}
-
-	pc->pctl_dev = pinctrl_register(&bcm2835_pinctrl_desc, dev, pc);
-	if (!pc->pctl_dev) {
-		gpiochip_remove(&pc->gpio_chip);
-		return -EINVAL;
-	}
-
-	pc->gpio_range = bcm2835_pinctrl_gpio_range;
-	pc->gpio_range.base = pc->gpio_chip.base;
-	pc->gpio_range.gc = &pc->gpio_chip;
-	pinctrl_add_gpio_range(pc->pctl_dev, &pc->gpio_range);
-
-	return 0;
-}
-
-static int bcm2835_pinctrl_remove(struct platform_device *pdev)
-{
-	struct bcm2835_pinctrl *pc = platform_get_drvdata(pdev);
-
-	pinctrl_unregister(pc->pctl_dev);
-	gpiochip_remove(&pc->gpio_chip);
-
-	return 0;
-}
-
-static struct of_device_id bcm2835_pinctrl_match[] = {
-	{ .compatible = "brcm,bcm2835-gpio" },
-	{}
-};
-MODULE_DEVICE_TABLE(of, bcm2835_pinctrl_match);
-
-static struct platform_driver bcm2835_pinctrl_driver = {
-	.probe = bcm2835_pinctrl_probe,
-	.remove = bcm2835_pinctrl_remove,
-	.driver = {
-		.name = MODULE_NAME,
-		.of_match_table = bcm2835_pinctrl_match,
-	},
-};
-module_platform_driver(bcm2835_pinctrl_driver);
-
-MODULE_AUTHOR("Chris Boot, Simon Arlott, Stephen Warren");
-MODULE_DESCRIPTION("BCM2835 Pin control driver");
-MODULE_LICENSE("GPL");
-- 
1.7.9.5

[PATCH v4 2/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Ray Jui]

Device tree binding documentation for Broadcom Cygnus IOMUX driver

Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
---
 .../bindings/pinctrl/brcm,cygnus-pinmux.txt        |  157 ++++++++++++++++++++
 1 file changed, 157 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinmux.txt

diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinmux.txt b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinmux.txt
new file mode 100644
index 0000000..985ad90
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinmux.txt
@@ -0,0 +1,157 @@
+Broadcom Cygnus IOMUX Controller
+
+The Cygnus IOMUX controller supports group based mux configuration. In
+addition, certain pins can be muxed to GPIO function individually.
+
+Required properties:
+
+- compatible:
+    Must be "brcm,cygnus-pinmux"
+
+- reg:
+    Define the base and range of the I/O address space that contains the Cygnus
+IOMUX registers
+
+Required properties in child nodes:
+
+- function:
+    The mux function to select
+
+- groups:
+    The list of groups to select with a given function
+
+Each child node represents a configuration. Client devices reference the child
+node to enable a mux configuration
+
+For more details, refer to
+Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
+
+For example:
+
+	pinmux: pinmux@0x0301d0c8 {
+		compatible = "brcm,cygnus-pinmux";
+		reg = <0x0301d0c8 0x1b0>;
+
+		i2s_0: i2s_0 {
+			function = "i2s0";
+			groups = "i2s0_0_grp", "i2s0_1_grp";
+		};
+
+		i2s_1: i2s_1 {
+			function = "i2s1";
+			groups = "i2s1_0_grp", "i2s1_1_grp";
+		};
+
+		i2s_2: i2s_2 {
+			function = "i2s2";
+			groups = "i2s2_0_grp", "i2s2_1_grp", "i2s2_2_grp",
+				 "i2s2_3_grp", "i2s2_4_grp";
+		};
+
+		spi_0: spi_0 {
+			function = "spi0";
+			groups = "spi0_grp";
+		};
+	}
+
+	spi0@18028000 {
+			compatible = "arm,pl022", "arm,primecell";
+			reg = <0x18028000 0x1000>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			interrupts = <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>;
+			pinctrl-0 = <&spi_0>;
+			clocks = <&axi81_clk>;
+			clock-names = "apb_pclk";
+	};
+
+List of supported functions and groups in Cygnus:
+
+"i2s0": "i2s0_0_grp", "i2s0_1_grp"
+
+"i2s1": "i2s1_0_grp", "i2s1_1_grp"
+
+"i2s2": "i2s2_0_grp", "i2s2_1_grp", "i2s2_2_grp", "i2s2_3_grp", "i2s2_4_grp"
+
+"spdif": "spdif_grp"
+
+"pwm0": "pwm0_grp"
+
+"pwm1": "pwm1_grp"
+
+"pwm2": "pwm2_grp"
+
+"pwm3": "pwm3_grp"
+
+"pwm4": "pwm4_grp"
+
+"pwm5": "pwm5_grp"
+
+"key": "key0_grp", "key1_grp", "key2_grp", "key3_grp", "key4_grp", "key5_grp",
+"key6_grp", "key7_grp", "key8_grp", "key9_grp", "key10_grp", "key11_grp",
+"key12_grp", "key13_grp", "key14_grp", "key15_grp"
+
+"audio_dte": "audio_dte0_grp", "audio_dte1_grp", "audio_dte2_grp", "audio_dte3_grp"
+
+"smart_card0": "smart_card0_grp", "smart_card0_fcb_grp"
+
+"smart_card1": "smart_card1_grp", "smart_card1_fcb_grp"
+
+"spi0": "spi0_grp"
+
+"spi1": "spi1_grp"
+
+"spi2": "spi2_grp"
+
+"spi3": "spi3_grp"
+
+"spi4": "spi4_0_grp", "spi4_1_grp"
+
+"spi5": "spi5_grp"
+
+"sw_led0": "sw_led0_0_grp", "sw_led0_1_grp"
+
+"sw_led1": "sw_led1_grp"
+
+"sw_led2": "sw_led2_0_grp", "sw_led2_1_grp"
+
+"d1w": "d1w_grp"
+
+"lcd": "lcd_grp"
+
+"sram": "sram_0_grp", "sram_1_grp"
+
+"uart0": "uart0_grp"
+
+"uart1": "uart1_grp", "uart1_dte_grp"
+
+"uart2": "uart2_grp"
+
+"uart3": "uart3_grp"
+
+"uart4": "uart4_grp"
+
+"qspi": "qspi_0_grp", "qspi_1_grp"
+
+"nand": "nand_grp"
+
+"sdio0": "sdio0_grp", "sdio0_cd_grp", "sdio0_mmc_grp"
+
+"sdio1": "sdio1_data_0_grp", "sdio1_data_1_grp", "sdio1_cd_grp",
+"sdio1_led_grp", "sdio1_mmc_grp"
+
+"can0": "can0_grp"
+
+"can1": "can1_grp"
+
+"cam": "cam_led_grp", "cam_0_grp", "cam_1_grp"
+
+"bsc1": "bsc1_grp"
+
+"pcie_clkreq": "pcie_clkreq_grp"
+
+"usb0_oc": "usb0_oc_grp"
+
+"usb1_oc": "usb1_oc_grp"
+
+"usb2_oc": "usb2_oc_grp"
-- 
1.7.9.5

--
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[PATCH v4 2/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Ray Jui]

Device tree binding documentation for Broadcom Cygnus IOMUX driver

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../bindings/pinctrl/brcm,cygnus-pinmux.txt        |  157 ++++++++++++++++++++
 1 file changed, 157 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinmux.txt

diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinmux.txt b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinmux.txt
new file mode 100644
index 0000000..985ad90
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinmux.txt
@@ -0,0 +1,157 @@
+Broadcom Cygnus IOMUX Controller
+
+The Cygnus IOMUX controller supports group based mux configuration. In
+addition, certain pins can be muxed to GPIO function individually.
+
+Required properties:
+
+- compatible:
+    Must be "brcm,cygnus-pinmux"
+
+- reg:
+    Define the base and range of the I/O address space that contains the Cygnus
+IOMUX registers
+
+Required properties in child nodes:
+
+- function:
+    The mux function to select
+
+- groups:
+    The list of groups to select with a given function
+
+Each child node represents a configuration. Client devices reference the child
+node to enable a mux configuration
+
+For more details, refer to
+Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
+
+For example:
+
+	pinmux: pinmux@0x0301d0c8 {
+		compatible = "brcm,cygnus-pinmux";
+		reg = <0x0301d0c8 0x1b0>;
+
+		i2s_0: i2s_0 {
+			function = "i2s0";
+			groups = "i2s0_0_grp", "i2s0_1_grp";
+		};
+
+		i2s_1: i2s_1 {
+			function = "i2s1";
+			groups = "i2s1_0_grp", "i2s1_1_grp";
+		};
+
+		i2s_2: i2s_2 {
+			function = "i2s2";
+			groups = "i2s2_0_grp", "i2s2_1_grp", "i2s2_2_grp",
+				 "i2s2_3_grp", "i2s2_4_grp";
+		};
+
+		spi_0: spi_0 {
+			function = "spi0";
+			groups = "spi0_grp";
+		};
+	}
+
+	spi0@18028000 {
+			compatible = "arm,pl022", "arm,primecell";
+			reg = <0x18028000 0x1000>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			interrupts = <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>;
+			pinctrl-0 = <&spi_0>;
+			clocks = <&axi81_clk>;
+			clock-names = "apb_pclk";
+	};
+
+List of supported functions and groups in Cygnus:
+
+"i2s0": "i2s0_0_grp", "i2s0_1_grp"
+
+"i2s1": "i2s1_0_grp", "i2s1_1_grp"
+
+"i2s2": "i2s2_0_grp", "i2s2_1_grp", "i2s2_2_grp", "i2s2_3_grp", "i2s2_4_grp"
+
+"spdif": "spdif_grp"
+
+"pwm0": "pwm0_grp"
+
+"pwm1": "pwm1_grp"
+
+"pwm2": "pwm2_grp"
+
+"pwm3": "pwm3_grp"
+
+"pwm4": "pwm4_grp"
+
+"pwm5": "pwm5_grp"
+
+"key": "key0_grp", "key1_grp", "key2_grp", "key3_grp", "key4_grp", "key5_grp",
+"key6_grp", "key7_grp", "key8_grp", "key9_grp", "key10_grp", "key11_grp",
+"key12_grp", "key13_grp", "key14_grp", "key15_grp"
+
+"audio_dte": "audio_dte0_grp", "audio_dte1_grp", "audio_dte2_grp", "audio_dte3_grp"
+
+"smart_card0": "smart_card0_grp", "smart_card0_fcb_grp"
+
+"smart_card1": "smart_card1_grp", "smart_card1_fcb_grp"
+
+"spi0": "spi0_grp"
+
+"spi1": "spi1_grp"
+
+"spi2": "spi2_grp"
+
+"spi3": "spi3_grp"
+
+"spi4": "spi4_0_grp", "spi4_1_grp"
+
+"spi5": "spi5_grp"
+
+"sw_led0": "sw_led0_0_grp", "sw_led0_1_grp"
+
+"sw_led1": "sw_led1_grp"
+
+"sw_led2": "sw_led2_0_grp", "sw_led2_1_grp"
+
+"d1w": "d1w_grp"
+
+"lcd": "lcd_grp"
+
+"sram": "sram_0_grp", "sram_1_grp"
+
+"uart0": "uart0_grp"
+
+"uart1": "uart1_grp", "uart1_dte_grp"
+
+"uart2": "uart2_grp"
+
+"uart3": "uart3_grp"
+
+"uart4": "uart4_grp"
+
+"qspi": "qspi_0_grp", "qspi_1_grp"
+
+"nand": "nand_grp"
+
+"sdio0": "sdio0_grp", "sdio0_cd_grp", "sdio0_mmc_grp"
+
+"sdio1": "sdio1_data_0_grp", "sdio1_data_1_grp", "sdio1_cd_grp",
+"sdio1_led_grp", "sdio1_mmc_grp"
+
+"can0": "can0_grp"
+
+"can1": "can1_grp"
+
+"cam": "cam_led_grp", "cam_0_grp", "cam_1_grp"
+
+"bsc1": "bsc1_grp"
+
+"pcie_clkreq": "pcie_clkreq_grp"
+
+"usb0_oc": "usb0_oc_grp"
+
+"usb1_oc": "usb1_oc_grp"
+
+"usb2_oc": "usb2_oc_grp"
-- 
1.7.9.5

[PATCH v4 2/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

[Ray Jui]

Device tree binding documentation for Broadcom Cygnus IOMUX driver

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../bindings/pinctrl/brcm,cygnus-pinmux.txt        |  157 ++++++++++++++++++++
 1 file changed, 157 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinmux.txt

diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinmux.txt b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinmux.txt
new file mode 100644
index 0000000..985ad90
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-pinmux.txt
@@ -0,0 +1,157 @@
+Broadcom Cygnus IOMUX Controller
+
+The Cygnus IOMUX controller supports group based mux configuration. In
+addition, certain pins can be muxed to GPIO function individually.
+
+Required properties:
+
+- compatible:
+    Must be "brcm,cygnus-pinmux"
+
+- reg:
+    Define the base and range of the I/O address space that contains the Cygnus
+IOMUX registers
+
+Required properties in child nodes:
+
+- function:
+    The mux function to select
+
+- groups:
+    The list of groups to select with a given function
+
+Each child node represents a configuration. Client devices reference the child
+node to enable a mux configuration
+
+For more details, refer to
+Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
+
+For example:
+
+	pinmux: pinmux at 0x0301d0c8 {
+		compatible = "brcm,cygnus-pinmux";
+		reg = <0x0301d0c8 0x1b0>;
+
+		i2s_0: i2s_0 {
+			function = "i2s0";
+			groups = "i2s0_0_grp", "i2s0_1_grp";
+		};
+
+		i2s_1: i2s_1 {
+			function = "i2s1";
+			groups = "i2s1_0_grp", "i2s1_1_grp";
+		};
+
+		i2s_2: i2s_2 {
+			function = "i2s2";
+			groups = "i2s2_0_grp", "i2s2_1_grp", "i2s2_2_grp",
+				 "i2s2_3_grp", "i2s2_4_grp";
+		};
+
+		spi_0: spi_0 {
+			function = "spi0";
+			groups = "spi0_grp";
+		};
+	}
+
+	spi0 at 18028000 {
+			compatible = "arm,pl022", "arm,primecell";
+			reg = <0x18028000 0x1000>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			interrupts = <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>;
+			pinctrl-0 = <&spi_0>;
+			clocks = <&axi81_clk>;
+			clock-names = "apb_pclk";
+	};
+
+List of supported functions and groups in Cygnus:
+
+"i2s0": "i2s0_0_grp", "i2s0_1_grp"
+
+"i2s1": "i2s1_0_grp", "i2s1_1_grp"
+
+"i2s2": "i2s2_0_grp", "i2s2_1_grp", "i2s2_2_grp", "i2s2_3_grp", "i2s2_4_grp"
+
+"spdif": "spdif_grp"
+
+"pwm0": "pwm0_grp"
+
+"pwm1": "pwm1_grp"
+
+"pwm2": "pwm2_grp"
+
+"pwm3": "pwm3_grp"
+
+"pwm4": "pwm4_grp"
+
+"pwm5": "pwm5_grp"
+
+"key": "key0_grp", "key1_grp", "key2_grp", "key3_grp", "key4_grp", "key5_grp",
+"key6_grp", "key7_grp", "key8_grp", "key9_grp", "key10_grp", "key11_grp",
+"key12_grp", "key13_grp", "key14_grp", "key15_grp"
+
+"audio_dte": "audio_dte0_grp", "audio_dte1_grp", "audio_dte2_grp", "audio_dte3_grp"
+
+"smart_card0": "smart_card0_grp", "smart_card0_fcb_grp"
+
+"smart_card1": "smart_card1_grp", "smart_card1_fcb_grp"
+
+"spi0": "spi0_grp"
+
+"spi1": "spi1_grp"
+
+"spi2": "spi2_grp"
+
+"spi3": "spi3_grp"
+
+"spi4": "spi4_0_grp", "spi4_1_grp"
+
+"spi5": "spi5_grp"
+
+"sw_led0": "sw_led0_0_grp", "sw_led0_1_grp"
+
+"sw_led1": "sw_led1_grp"
+
+"sw_led2": "sw_led2_0_grp", "sw_led2_1_grp"
+
+"d1w": "d1w_grp"
+
+"lcd": "lcd_grp"
+
+"sram": "sram_0_grp", "sram_1_grp"
+
+"uart0": "uart0_grp"
+
+"uart1": "uart1_grp", "uart1_dte_grp"
+
+"uart2": "uart2_grp"
+
+"uart3": "uart3_grp"
+
+"uart4": "uart4_grp"
+
+"qspi": "qspi_0_grp", "qspi_1_grp"
+
+"nand": "nand_grp"
+
+"sdio0": "sdio0_grp", "sdio0_cd_grp", "sdio0_mmc_grp"
+
+"sdio1": "sdio1_data_0_grp", "sdio1_data_1_grp", "sdio1_cd_grp",
+"sdio1_led_grp", "sdio1_mmc_grp"
+
+"can0": "can0_grp"
+
+"can1": "can1_grp"
+
+"cam": "cam_led_grp", "cam_0_grp", "cam_1_grp"
+
+"bsc1": "bsc1_grp"
+
+"pcie_clkreq": "pcie_clkreq_grp"
+
+"usb0_oc": "usb0_oc_grp"
+
+"usb1_oc": "usb1_oc_grp"
+
+"usb2_oc": "usb2_oc_grp"
-- 
1.7.9.5

[PATCH v4 3/4] pinctrl: cygnus: add initial IOMUX driver support

[Ray Jui]

This adds the initial driver support for the Broadcom Cygnus IOMUX
controller. The Cygnus IOMUX controller supports group based mux
configuration but allows certain pins to be muxed to GPIO individually

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/pinctrl/bcm/Kconfig              |   13 +
 drivers/pinctrl/bcm/Makefile             |    5 +-
 drivers/pinctrl/bcm/pinctrl-cygnus-mux.c | 1088 ++++++++++++++++++++++++++++++
 3 files changed, 1104 insertions(+), 2 deletions(-)
 create mode 100644 drivers/pinctrl/bcm/pinctrl-cygnus-mux.c

diff --git a/drivers/pinctrl/bcm/Kconfig b/drivers/pinctrl/bcm/Kconfig
index bc6d048..eb13201 100644
--- a/drivers/pinctrl/bcm/Kconfig
+++ b/drivers/pinctrl/bcm/Kconfig
@@ -19,3 +19,16 @@ config PINCTRL_BCM2835
 	bool
 	select PINMUX
 	select PINCONF
+
+config PINCTRL_CYGNUS_MUX
+	bool "Broadcom Cygnus IOMUX driver"
+	depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
+	select PINMUX
+	select GENERIC_PINCONF
+	default ARCH_BCM_CYGNUS
+	help
+	  Say yes here to enable the Broadcom Cygnus IOMUX driver.
+
+	  The Broadcom Cygnus IOMUX driver supports group based IOMUX
+	  configuration, with the exception that certain individual pins
+	  can be overrided to GPIO function
diff --git a/drivers/pinctrl/bcm/Makefile b/drivers/pinctrl/bcm/Makefile
index 7ba80a3..bb6beb6 100644
--- a/drivers/pinctrl/bcm/Makefile
+++ b/drivers/pinctrl/bcm/Makefile
@@ -1,4 +1,5 @@
 # Broadcom pinctrl support
 
-obj-$(CONFIG_PINCTRL_BCM281XX)	+= pinctrl-bcm281xx.o
-obj-$(CONFIG_PINCTRL_BCM2835)	+= pinctrl-bcm2835.o
+obj-$(CONFIG_PINCTRL_BCM281XX)		+= pinctrl-bcm281xx.o
+obj-$(CONFIG_PINCTRL_BCM2835)		+= pinctrl-bcm2835.o
+obj-$(CONFIG_PINCTRL_CYGNUS_MUX)	+= pinctrl-cygnus-mux.o
diff --git a/drivers/pinctrl/bcm/pinctrl-cygnus-mux.c b/drivers/pinctrl/bcm/pinctrl-cygnus-mux.c
new file mode 100644
index 0000000..c4c4ed2
--- /dev/null
+++ b/drivers/pinctrl/bcm/pinctrl-cygnus-mux.c
@@ -0,0 +1,1088 @@
+/* Copyright (C) 2014-2015 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * This file contains the Cygnus IOMUX driver that supports group based PINMUX
+ * configuration. Although PINMUX configuration is mainly group based, the
+ * Cygnus IOMUX controller allows certain pins to be individually muxed to GPIO
+ * function, and therefore be controlled by the Cygnus ASIU GPIO controller
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include "../core.h"
+#include "../pinctrl-utils.h"
+
+#define CYGNUS_NUM_IOMUX_REGS     8
+#define CYGNUS_NUM_MUX_PER_REG    8
+#define CYGNUS_NUM_IOMUX          (CYGNUS_NUM_IOMUX_REGS * \
+				   CYGNUS_NUM_MUX_PER_REG)
+
+/*
+ * Cygnus IOMUX register description
+ *
+ * @offset: register offset for mux configuration of a group
+ * @shift: bit shift for mux configuration of a group
+ * @alt: alternate function to set to
+ */
+struct cygnus_mux {
+	unsigned int offset;
+	unsigned int shift;
+	unsigned int alt;
+};
+
+/*
+ * Keep track of Cygnus IOMUX configuration and prevent double configuration
+ *
+ * @cygnus_mux: Cygnus IOMUX register description
+ * @is_configured: flag to indicate whether a mux setting has already been
+ * configured
+ */
+struct cygnus_mux_log {
+	struct cygnus_mux mux;
+	bool is_configured;
+};
+
+/*
+ * Group based IOMUX configuration
+ *
+ * @name: name of the group
+ * @pins: array of pins used by this group
+ * @num_pins: total number of pins used by this group
+ * @mux: Cygnus group based IOMUX configuration
+ */
+struct cygnus_pin_group {
+	const char *name;
+	const unsigned *pins;
+	unsigned num_pins;
+	struct cygnus_mux mux;
+};
+
+/*
+ * Cygnus mux function and supported pin groups
+ *
+ * @name: name of the function
+ * @groups: array of groups that can be supported by this function
+ * @num_groups: total number of groups that can be supported by this function
+ */
+struct cygnus_pin_function {
+	const char *name;
+	const char * const *groups;
+	unsigned num_groups;
+};
+
+/*
+ * Cygnus IOMUX pinctrl core
+ *
+ * @pctl: pointer to pinctrl_dev
+ * @dev: pointer to device
+ * @base0: first I/O register base of the Cygnus IOMUX controller
+ * @base1: second I/O register base
+ * @groups: pointer to array of groups
+ * @num_groups: total number of groups
+ * @functions: pointer to array of functions
+ * @num_functions: total number of functions
+ * @mux_log: pointer to the array of mux logs
+ * @lock: lock to protect register access
+ */
+struct cygnus_pinctrl {
+	struct pinctrl_dev *pctl;
+	struct device *dev;
+	void __iomem *base0;
+	void __iomem *base1;
+
+	const struct cygnus_pin_group *groups;
+	unsigned num_groups;
+
+	const struct cygnus_pin_function *functions;
+	unsigned num_functions;
+
+	struct cygnus_mux_log *mux_log;
+
+	spinlock_t lock;
+};
+
+/*
+ * Certain pins can be individually muxed to GPIO function
+ *
+ * @is_supported: flag to indicate GPIO mux is supported for this pin
+ * @offset: register offset for GPIO mux override of a pin
+ * @shift: bit shift for GPIO mux override of a pin
+ */
+struct cygnus_gpio_mux {
+	int is_supported;
+	unsigned int offset;
+	unsigned int shift;
+};
+
+/*
+ * Description of a pin in Cygnus
+ *
+ * @pin: pin number
+ * @name: pin name
+ * @gpio_mux: GPIO override related information
+ */
+struct cygnus_pin {
+	unsigned pin;
+	char *name;
+	struct cygnus_gpio_mux gpio_mux;
+};
+
+#define CYGNUS_PIN_DESC(p, n, i, o, s)	\
+{					\
+	.pin = p,			\
+	.name = n,			\
+	.gpio_mux = {			\
+		.is_supported = i,	\
+		.offset = o,		\
+		.shift = s,		\
+	},				\
+}
+
+/*
+ * List of pins in Cygnus
+ */
+static struct cygnus_pin cygnus_pins[] = {
+	CYGNUS_PIN_DESC(0, "ext_device_reset_n", 0, 0, 0),
+	CYGNUS_PIN_DESC(1, "chip_mode0", 0, 0, 0),
+	CYGNUS_PIN_DESC(2, "chip_mode1", 0, 0, 0),
+	CYGNUS_PIN_DESC(3, "chip_mode2", 0, 0, 0),
+	CYGNUS_PIN_DESC(4, "chip_mode3", 0, 0, 0),
+	CYGNUS_PIN_DESC(5, "chip_mode4", 0, 0, 0),
+	CYGNUS_PIN_DESC(6, "bsc0_scl", 0, 0, 0),
+	CYGNUS_PIN_DESC(7, "bsc0_sda", 0, 0, 0),
+	CYGNUS_PIN_DESC(8, "bsc1_scl", 0, 0, 0),
+	CYGNUS_PIN_DESC(9, "bsc1_sda", 0, 0, 0),
+	CYGNUS_PIN_DESC(10, "d1w_dq", 1, 0x28, 0),
+	CYGNUS_PIN_DESC(11, "d1wowstz_l", 1, 0x4, 28),
+	CYGNUS_PIN_DESC(12, "gpio0", 0, 0, 0),
+	CYGNUS_PIN_DESC(13, "gpio1", 0, 0, 0),
+	CYGNUS_PIN_DESC(14, "gpio2", 0, 0, 0),
+	CYGNUS_PIN_DESC(15, "gpio3", 0, 0, 0),
+	CYGNUS_PIN_DESC(16, "gpio4", 0, 0, 0),
+	CYGNUS_PIN_DESC(17, "gpio5", 0, 0, 0),
+	CYGNUS_PIN_DESC(18, "gpio6", 0, 0, 0),
+	CYGNUS_PIN_DESC(19, "gpio7", 0, 0, 0),
+	CYGNUS_PIN_DESC(20, "gpio8", 0, 0, 0),
+	CYGNUS_PIN_DESC(21, "gpio9", 0, 0, 0),
+	CYGNUS_PIN_DESC(22, "gpio10", 0, 0, 0),
+	CYGNUS_PIN_DESC(23, "gpio11", 0, 0, 0),
+	CYGNUS_PIN_DESC(24, "gpio12", 0, 0, 0),
+	CYGNUS_PIN_DESC(25, "gpio13", 0, 0, 0),
+	CYGNUS_PIN_DESC(26, "gpio14", 0, 0, 0),
+	CYGNUS_PIN_DESC(27, "gpio15", 0, 0, 0),
+	CYGNUS_PIN_DESC(28, "gpio16", 0, 0, 0),
+	CYGNUS_PIN_DESC(29, "gpio17", 0, 0, 0),
+	CYGNUS_PIN_DESC(30, "gpio18", 0, 0, 0),
+	CYGNUS_PIN_DESC(31, "gpio19", 0, 0, 0),
+	CYGNUS_PIN_DESC(32, "gpio20", 0, 0, 0),
+	CYGNUS_PIN_DESC(33, "gpio21", 0, 0, 0),
+	CYGNUS_PIN_DESC(34, "gpio22", 0, 0, 0),
+	CYGNUS_PIN_DESC(35, "gpio23", 0, 0, 0),
+	CYGNUS_PIN_DESC(36, "mdc", 0, 0, 0),
+	CYGNUS_PIN_DESC(37, "mdio", 0, 0, 0),
+	CYGNUS_PIN_DESC(38, "pwm0", 1, 0x10, 30),
+	CYGNUS_PIN_DESC(39, "pwm1", 1, 0x10, 28),
+	CYGNUS_PIN_DESC(40, "pwm2", 1, 0x10, 26),
+	CYGNUS_PIN_DESC(41, "pwm3", 1, 0x10, 24),
+	CYGNUS_PIN_DESC(42, "sc0_clk", 1, 0x10, 22),
+	CYGNUS_PIN_DESC(43, "sc0_cmdvcc_l", 1, 0x10, 20),
+	CYGNUS_PIN_DESC(44, "sc0_detect", 1, 0x10, 18),
+	CYGNUS_PIN_DESC(45, "sc0_fcb", 1, 0x10, 16),
+	CYGNUS_PIN_DESC(46, "sc0_io", 1, 0x10, 14),
+	CYGNUS_PIN_DESC(47, "sc0_rst_l", 1, 0x10, 12),
+	CYGNUS_PIN_DESC(48, "sc1_clk", 1, 0x10, 10),
+	CYGNUS_PIN_DESC(49, "sc1_cmdvcc_l", 1, 0x10, 8),
+	CYGNUS_PIN_DESC(50, "sc1_detect", 1, 0x10, 6),
+	CYGNUS_PIN_DESC(51, "sc1_fcb", 1, 0x10, 4),
+	CYGNUS_PIN_DESC(52, "sc1_io", 1, 0x10, 2),
+	CYGNUS_PIN_DESC(53, "sc1_rst_l", 1, 0x10, 0),
+	CYGNUS_PIN_DESC(54, "spi0_clk", 1, 0x18, 10),
+	CYGNUS_PIN_DESC(55, "spi0_mosi", 1, 0x18, 6),
+	CYGNUS_PIN_DESC(56, "spi0_miso", 1, 0x18, 8),
+	CYGNUS_PIN_DESC(57, "spi0_ss", 1, 0x18, 4),
+	CYGNUS_PIN_DESC(58, "spi1_clk", 1, 0x18, 2),
+	CYGNUS_PIN_DESC(59, "spi1_mosi", 1, 0x1c, 30),
+	CYGNUS_PIN_DESC(60, "spi1_miso", 1, 0x18, 0),
+	CYGNUS_PIN_DESC(61, "spi1_ss", 1, 0x1c, 28),
+	CYGNUS_PIN_DESC(62, "spi2_clk", 1, 0x1c, 26),
+	CYGNUS_PIN_DESC(63, "spi2_mosi", 1, 0x1c, 22),
+	CYGNUS_PIN_DESC(64, "spi2_miso", 1, 0x1c, 24),
+	CYGNUS_PIN_DESC(65, "spi2_ss", 1, 0x1c, 20),
+	CYGNUS_PIN_DESC(66, "spi3_clk", 1, 0x1c, 18),
+	CYGNUS_PIN_DESC(67, "spi3_mosi", 1, 0x1c, 14),
+	CYGNUS_PIN_DESC(68, "spi3_miso", 1, 0x1c, 16),
+	CYGNUS_PIN_DESC(69, "spi3_ss", 1, 0x1c, 12),
+	CYGNUS_PIN_DESC(70, "uart0_cts", 1, 0x1c, 10),
+	CYGNUS_PIN_DESC(71, "uart0_rts", 1, 0x1c, 8),
+	CYGNUS_PIN_DESC(72, "uart0_rx", 1, 0x1c, 6),
+	CYGNUS_PIN_DESC(73, "uart0_tx", 1, 0x1c, 4),
+	CYGNUS_PIN_DESC(74, "uart1_cts", 1, 0x1c, 2),
+	CYGNUS_PIN_DESC(75, "uart1_dcd", 1, 0x1c, 0),
+	CYGNUS_PIN_DESC(76, "uart1_dsr", 1, 0x20, 14),
+	CYGNUS_PIN_DESC(77, "uart1_dtr", 1, 0x20, 12),
+	CYGNUS_PIN_DESC(78, "uart1_ri", 1, 0x20, 10),
+	CYGNUS_PIN_DESC(79, "uart1_rts", 1, 0x20, 8),
+	CYGNUS_PIN_DESC(80, "uart1_rx", 1, 0x20, 6),
+	CYGNUS_PIN_DESC(81, "uart1_tx", 1, 0x20, 4),
+	CYGNUS_PIN_DESC(82, "uart3_rx", 1, 0x20, 2),
+	CYGNUS_PIN_DESC(83, "uart3_tx", 1, 0x20, 0),
+	CYGNUS_PIN_DESC(84, "sdio1_clk_sdcard", 1, 0x14, 6),
+	CYGNUS_PIN_DESC(85, "sdio1_cmd", 1, 0x14, 4),
+	CYGNUS_PIN_DESC(86, "sdio1_data0", 1, 0x14, 2),
+	CYGNUS_PIN_DESC(87, "sdio1_data1", 1, 0x14, 0),
+	CYGNUS_PIN_DESC(88, "sdio1_data2", 1, 0x18, 30),
+	CYGNUS_PIN_DESC(89, "sdio1_data3", 1, 0x18, 28),
+	CYGNUS_PIN_DESC(90, "sdio1_wp_n", 1, 0x18, 24),
+	CYGNUS_PIN_DESC(91, "sdio1_card_rst", 1, 0x14, 10),
+	CYGNUS_PIN_DESC(92, "sdio1_led_on", 1, 0x18, 26),
+	CYGNUS_PIN_DESC(93, "sdio1_cd", 1, 0x14, 8),
+	CYGNUS_PIN_DESC(94, "sdio0_clk_sdcard", 1, 0x14, 26),
+	CYGNUS_PIN_DESC(95, "sdio0_cmd", 1, 0x14, 24),
+	CYGNUS_PIN_DESC(96, "sdio0_data0", 1, 0x14, 22),
+	CYGNUS_PIN_DESC(97, "sdio0_data1", 1, 0x14, 20),
+	CYGNUS_PIN_DESC(98, "sdio0_data2", 1, 0x14, 18),
+	CYGNUS_PIN_DESC(99, "sdio0_data3", 1, 0x14, 16),
+	CYGNUS_PIN_DESC(100, "sdio0_wp_n", 1, 0x14, 12),
+	CYGNUS_PIN_DESC(101, "sdio0_card_rst", 1, 0x14, 30),
+	CYGNUS_PIN_DESC(102, "sdio0_led_on", 1, 0x14, 14),
+	CYGNUS_PIN_DESC(103, "sdio0_cd", 1, 0x14, 28),
+	CYGNUS_PIN_DESC(104, "sflash_clk", 1, 0x18, 22),
+	CYGNUS_PIN_DESC(105, "sflash_cs_l", 1, 0x18, 20),
+	CYGNUS_PIN_DESC(106, "sflash_mosi", 1, 0x18, 14),
+	CYGNUS_PIN_DESC(107, "sflash_miso", 1, 0x18, 16),
+	CYGNUS_PIN_DESC(108, "sflash_wp_n", 1, 0x18, 12),
+	CYGNUS_PIN_DESC(109, "sflash_hold_n", 1, 0x18, 18),
+	CYGNUS_PIN_DESC(110, "nand_ale", 1, 0xc, 30),
+	CYGNUS_PIN_DESC(111, "nand_ce0_l", 1, 0xc, 28),
+	CYGNUS_PIN_DESC(112, "nand_ce1_l", 1, 0xc, 26),
+	CYGNUS_PIN_DESC(113, "nand_cle", 1, 0xc, 24),
+	CYGNUS_PIN_DESC(114, "nand_dq0", 1, 0xc, 22),
+	CYGNUS_PIN_DESC(115, "nand_dq1", 1, 0xc, 20),
+	CYGNUS_PIN_DESC(116, "nand_dq2", 1, 0xc, 18),
+	CYGNUS_PIN_DESC(117, "nand_dq3", 1, 0xc, 16),
+	CYGNUS_PIN_DESC(118, "nand_dq4", 1, 0xc, 14),
+	CYGNUS_PIN_DESC(119, "nand_dq5", 1, 0xc, 12),
+	CYGNUS_PIN_DESC(120, "nand_dq6", 1, 0xc, 10),
+	CYGNUS_PIN_DESC(121, "nand_dq7", 1, 0xc, 8),
+	CYGNUS_PIN_DESC(122, "nand_rb_l", 1, 0xc, 6),
+	CYGNUS_PIN_DESC(123, "nand_re_l", 1, 0xc, 4),
+	CYGNUS_PIN_DESC(124, "nand_we_l", 1, 0xc, 2),
+	CYGNUS_PIN_DESC(125, "nand_wp_l", 1, 0xc, 0),
+	CYGNUS_PIN_DESC(126, "lcd_clac", 1, 0x4, 26),
+	CYGNUS_PIN_DESC(127, "lcd_clcp", 1, 0x4, 24),
+	CYGNUS_PIN_DESC(128, "lcd_cld0", 1, 0x4, 22),
+	CYGNUS_PIN_DESC(129, "lcd_cld1", 1, 0x4, 0),
+	CYGNUS_PIN_DESC(130, "lcd_cld10", 1, 0x4, 20),
+	CYGNUS_PIN_DESC(131, "lcd_cld11", 1, 0x4, 18),
+	CYGNUS_PIN_DESC(132, "lcd_cld12", 1, 0x4, 16),
+	CYGNUS_PIN_DESC(133, "lcd_cld13", 1, 0x4, 14),
+	CYGNUS_PIN_DESC(134, "lcd_cld14", 1, 0x4, 12),
+	CYGNUS_PIN_DESC(135, "lcd_cld15", 1, 0x4, 10),
+	CYGNUS_PIN_DESC(136, "lcd_cld16", 1, 0x4, 8),
+	CYGNUS_PIN_DESC(137, "lcd_cld17", 1, 0x4, 6),
+	CYGNUS_PIN_DESC(138, "lcd_cld18", 1, 0x4, 4),
+	CYGNUS_PIN_DESC(139, "lcd_cld19", 1, 0x4, 2),
+	CYGNUS_PIN_DESC(140, "lcd_cld2", 1, 0x8, 22),
+	CYGNUS_PIN_DESC(141, "lcd_cld20", 1, 0x8, 30),
+	CYGNUS_PIN_DESC(142, "lcd_cld21", 1, 0x8, 28),
+	CYGNUS_PIN_DESC(143, "lcd_cld22", 1, 0x8, 26),
+	CYGNUS_PIN_DESC(144, "lcd_cld23", 1, 0x8, 24),
+	CYGNUS_PIN_DESC(145, "lcd_cld3", 1, 0x8, 20),
+	CYGNUS_PIN_DESC(146, "lcd_cld4", 1, 0x8, 18),
+	CYGNUS_PIN_DESC(147, "lcd_cld5", 1, 0x8, 16),
+	CYGNUS_PIN_DESC(148, "lcd_cld6", 1, 0x8, 14),
+	CYGNUS_PIN_DESC(149, "lcd_cld7", 1, 0x8, 12),
+	CYGNUS_PIN_DESC(150, "lcd_cld8", 1, 0x8, 10),
+	CYGNUS_PIN_DESC(151, "lcd_cld9", 1, 0x8, 8),
+	CYGNUS_PIN_DESC(152, "lcd_clfp", 1, 0x8, 6),
+	CYGNUS_PIN_DESC(153, "lcd_clle", 1, 0x8, 4),
+	CYGNUS_PIN_DESC(154, "lcd_cllp", 1, 0x8, 2),
+	CYGNUS_PIN_DESC(155, "lcd_clpower", 1, 0x8, 0),
+	CYGNUS_PIN_DESC(156, "camera_vsync", 1, 0x4, 30),
+	CYGNUS_PIN_DESC(157, "camera_trigger", 1, 0x0, 0),
+	CYGNUS_PIN_DESC(158, "camera_strobe", 1, 0x0, 2),
+	CYGNUS_PIN_DESC(159, "camera_standby", 1, 0x0, 4),
+	CYGNUS_PIN_DESC(160, "camera_reset_n", 1, 0x0, 6),
+	CYGNUS_PIN_DESC(161, "camera_pixdata9", 1, 0x0, 8),
+	CYGNUS_PIN_DESC(162, "camera_pixdata8", 1, 0x0, 10),
+	CYGNUS_PIN_DESC(163, "camera_pixdata7", 1, 0x0, 12),
+	CYGNUS_PIN_DESC(164, "camera_pixdata6", 1, 0x0, 14),
+	CYGNUS_PIN_DESC(165, "camera_pixdata5", 1, 0x0, 16),
+	CYGNUS_PIN_DESC(166, "camera_pixdata4", 1, 0x0, 18),
+	CYGNUS_PIN_DESC(167, "camera_pixdata3", 1, 0x0, 20),
+	CYGNUS_PIN_DESC(168, "camera_pixdata2", 1, 0x0, 22),
+	CYGNUS_PIN_DESC(169, "camera_pixdata1", 1, 0x0, 24),
+	CYGNUS_PIN_DESC(170, "camera_pixdata0", 1, 0x0, 26),
+	CYGNUS_PIN_DESC(171, "camera_pixclk", 1, 0x0, 28),
+	CYGNUS_PIN_DESC(172, "camera_hsync", 1, 0x0, 30),
+	CYGNUS_PIN_DESC(173, "camera_pll_ref_clk", 0, 0, 0),
+	CYGNUS_PIN_DESC(174, "usb_id_indication", 0, 0, 0),
+	CYGNUS_PIN_DESC(175, "usb_vbus_indication", 0, 0, 0),
+	CYGNUS_PIN_DESC(176, "gpio0_3p3", 0, 0, 0),
+	CYGNUS_PIN_DESC(177, "gpio1_3p3", 0, 0, 0),
+	CYGNUS_PIN_DESC(178, "gpio2_3p3", 0, 0, 0),
+	CYGNUS_PIN_DESC(179, "gpio3_3p3", 0, 0, 0),
+};
+
+/*
+ * List of groups of pins
+ */
+static const unsigned bsc1_pins[] = { 8, 9 };
+static const unsigned pcie_clkreq_pins[] = { 8, 9 };
+
+static const unsigned i2s2_0_pins[] = { 12 };
+static const unsigned i2s2_1_pins[] = { 13 };
+static const unsigned i2s2_2_pins[] = { 14 };
+static const unsigned i2s2_3_pins[] = { 15 };
+static const unsigned i2s2_4_pins[] = { 16 };
+
+static const unsigned pwm4_pins[] = { 17 };
+static const unsigned pwm5_pins[] = { 18 };
+
+static const unsigned key0_pins[] = { 20 };
+static const unsigned key1_pins[] = { 21 };
+static const unsigned key2_pins[] = { 22 };
+static const unsigned key3_pins[] = { 23 };
+static const unsigned key4_pins[] = { 24 };
+static const unsigned key5_pins[] = { 25 };
+
+static const unsigned key6_pins[] = { 26 };
+static const unsigned audio_dte0_pins[] = { 26 };
+
+static const unsigned key7_pins[] = { 27 };
+static const unsigned audio_dte1_pins[] = { 27 };
+
+static const unsigned key8_pins[] = { 28 };
+static const unsigned key9_pins[] = { 29 };
+static const unsigned key10_pins[] = { 30 };
+static const unsigned key11_pins[] = { 31 };
+static const unsigned key12_pins[] = { 32 };
+static const unsigned key13_pins[] = { 33 };
+
+static const unsigned key14_pins[] = { 34 };
+static const unsigned audio_dte2_pins[] = { 34 };
+
+static const unsigned key15_pins[] = { 35 };
+static const unsigned audio_dte3_pins[] = { 35 };
+
+static const unsigned pwm0_pins[] = { 38 };
+static const unsigned pwm1_pins[] = { 39 };
+static const unsigned pwm2_pins[] = { 40 };
+static const unsigned pwm3_pins[] = { 41 };
+
+static const unsigned sdio0_pins[] = { 94, 95, 96, 97, 98, 99 };
+
+static const unsigned smart_card0_pins[] = { 42, 43, 44, 46, 47 };
+static const unsigned i2s0_0_pins[] = { 42, 43, 44, 46 };
+static const unsigned spdif_pins[] = { 47 };
+
+static const unsigned smart_card1_pins[] = { 48, 49, 50, 52, 53 };
+static const unsigned i2s1_0_pins[] = { 48, 49, 50, 52 };
+
+static const unsigned spi0_pins[] = { 54, 55, 56, 57 };
+
+static const unsigned spi1_pins[] = { 58, 59, 60, 61 };
+
+static const unsigned spi2_pins[] = { 62, 63, 64, 65 };
+
+static const unsigned spi3_pins[] = { 66, 67, 68, 69 };
+static const unsigned sw_led0_0_pins[] = { 66, 67, 68, 69 };
+
+static const unsigned d1w_pins[] = { 10, 11 };
+static const unsigned uart4_pins[] = { 10, 11 };
+static const unsigned sw_led2_0_pins[] = { 10, 11 };
+
+static const unsigned lcd_pins[] = { 126, 127, 128, 129, 130, 131, 132, 133,
+	134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147,
+	148, 149, 150, 151, 152, 153, 154, 155 };
+static const unsigned sram_0_pins[] = { 126, 127, 128, 129, 130, 131, 132, 133,
+	134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147,
+	148, 149, 150, 151, 152, 153, 154, 155 };
+static const unsigned spi5_pins[] = { 141, 142, 143, 144 };
+
+static const unsigned uart0_pins[] = { 70, 71, 72, 73 };
+static const unsigned sw_led0_1_pins[] = { 70, 71, 72, 73 };
+
+static const unsigned uart1_dte_pins[] = { 75, 76, 77, 78 };
+static const unsigned uart2_pins[] = { 75, 76, 77, 78 };
+
+static const unsigned uart1_pins[] = { 74, 79, 80, 81 };
+
+static const unsigned uart3_pins[] = { 82, 83 };
+
+static const unsigned qspi_0_pins[] = { 104, 105, 106, 107 };
+
+static const unsigned nand_pins[] = { 110, 111, 112, 113, 114, 115, 116, 117,
+	118, 119, 120, 121, 122, 123, 124, 125 };
+
+static const unsigned sdio0_cd_pins[] = { 103 };
+
+static const unsigned sdio0_mmc_pins[] = { 100, 101, 102 };
+
+static const unsigned sdio1_data_0_pins[] = { 86, 87 };
+static const unsigned can0_pins[] = { 86, 87 };
+static const unsigned spi4_0_pins[] = { 86, 87 };
+
+static const unsigned sdio1_data_1_pins[] = { 88, 89 };
+static const unsigned can1_pins[] = { 88, 89 };
+static const unsigned spi4_1_pins[] = { 88, 89 };
+
+static const unsigned sdio1_cd_pins[] = { 93 };
+
+static const unsigned sdio1_led_pins[] = { 84, 85 };
+static const unsigned sw_led2_1_pins[] = { 84, 85 };
+
+static const unsigned sdio1_mmc_pins[] = { 90, 91, 92 };
+
+static const unsigned cam_led_pins[] = { 156, 157, 158, 159, 160 };
+static const unsigned sw_led1_pins[] = { 156, 157, 158, 159 };
+
+static const unsigned cam_0_pins[] = { 169, 170, 171, 169, 170 };
+
+static const unsigned cam_1_pins[] = { 161, 162, 163, 164, 165, 166, 167,
+	168 };
+static const unsigned sram_1_pins[] = { 161, 162, 163, 164, 165, 166, 167,
+	168 };
+
+static const unsigned qspi_1_pins[] = { 108, 109 };
+
+static const unsigned smart_card0_fcb_pins[] = { 45 };
+static const unsigned i2s0_1_pins[] = { 45 };
+
+static const unsigned smart_card1_fcb_pins[] = { 51 };
+static const unsigned i2s1_1_pins[] = { 51 };
+
+static const unsigned gpio0_3p3_pins[] = { 176 };
+static const unsigned usb0_oc_pins[] = { 176 };
+
+static const unsigned gpio1_3p3_pins[] = { 177 };
+static const unsigned usb1_oc_pins[] = { 177 };
+
+static const unsigned gpio2_3p3_pins[] = { 178 };
+static const unsigned usb2_oc_pins[] = { 178 };
+
+#define CYGNUS_PIN_GROUP(group_name, off, sh, al)	\
+{							\
+	.name = __stringify(group_name) "_grp",		\
+	.pins = group_name ## _pins,			\
+	.num_pins = ARRAY_SIZE(group_name ## _pins),	\
+	.mux = {					\
+		.offset = off,				\
+		.shift = sh,				\
+		.alt = al,				\
+	}						\
+}
+
+/*
+ * List of Cygnus pin groups
+ */
+static const struct cygnus_pin_group cygnus_pin_groups[] = {
+	CYGNUS_PIN_GROUP(i2s2_0, 0x0, 0, 2),
+	CYGNUS_PIN_GROUP(i2s2_1, 0x0, 4, 2),
+	CYGNUS_PIN_GROUP(i2s2_2, 0x0, 8, 2),
+	CYGNUS_PIN_GROUP(i2s2_3, 0x0, 12, 2),
+	CYGNUS_PIN_GROUP(i2s2_4, 0x0, 16, 2),
+	CYGNUS_PIN_GROUP(pwm4, 0x0, 20, 0),
+	CYGNUS_PIN_GROUP(pwm5, 0x0, 24, 2),
+	CYGNUS_PIN_GROUP(key0, 0x4, 0, 1),
+	CYGNUS_PIN_GROUP(key1, 0x4, 4, 1),
+	CYGNUS_PIN_GROUP(key2, 0x4, 8, 1),
+	CYGNUS_PIN_GROUP(key3, 0x4, 12, 1),
+	CYGNUS_PIN_GROUP(key4, 0x4, 16, 1),
+	CYGNUS_PIN_GROUP(key5, 0x4, 20, 1),
+	CYGNUS_PIN_GROUP(key6, 0x4, 24, 1),
+	CYGNUS_PIN_GROUP(audio_dte0, 0x4, 24, 2),
+	CYGNUS_PIN_GROUP(key7, 0x4, 28, 1),
+	CYGNUS_PIN_GROUP(audio_dte1, 0x4, 28, 2),
+	CYGNUS_PIN_GROUP(key8, 0x8, 0, 1),
+	CYGNUS_PIN_GROUP(key9, 0x8, 4, 1),
+	CYGNUS_PIN_GROUP(key10, 0x8, 8, 1),
+	CYGNUS_PIN_GROUP(key11, 0x8, 12, 1),
+	CYGNUS_PIN_GROUP(key12, 0x8, 16, 1),
+	CYGNUS_PIN_GROUP(key13, 0x8, 20, 1),
+	CYGNUS_PIN_GROUP(key14, 0x8, 24, 1),
+	CYGNUS_PIN_GROUP(audio_dte2, 0x8, 24, 2),
+	CYGNUS_PIN_GROUP(key15, 0x8, 28, 1),
+	CYGNUS_PIN_GROUP(audio_dte3, 0x8, 28, 2),
+	CYGNUS_PIN_GROUP(pwm0, 0xc, 0, 0),
+	CYGNUS_PIN_GROUP(pwm1, 0xc, 4, 0),
+	CYGNUS_PIN_GROUP(pwm2, 0xc, 8, 0),
+	CYGNUS_PIN_GROUP(pwm3, 0xc, 12, 0),
+	CYGNUS_PIN_GROUP(sdio0, 0xc, 16, 0),
+	CYGNUS_PIN_GROUP(smart_card0, 0xc, 20, 0),
+	CYGNUS_PIN_GROUP(i2s0_0, 0xc, 20, 1),
+	CYGNUS_PIN_GROUP(spdif, 0xc, 20, 1),
+	CYGNUS_PIN_GROUP(smart_card1, 0xc, 24, 0),
+	CYGNUS_PIN_GROUP(i2s1_0, 0xc, 24, 1),
+	CYGNUS_PIN_GROUP(spi0, 0x10, 0, 0),
+	CYGNUS_PIN_GROUP(spi1, 0x10, 4, 0),
+	CYGNUS_PIN_GROUP(spi2, 0x10, 8, 0),
+	CYGNUS_PIN_GROUP(spi3, 0x10, 12, 0),
+	CYGNUS_PIN_GROUP(sw_led0_0, 0x10, 12, 2),
+	CYGNUS_PIN_GROUP(d1w, 0x10, 16, 0),
+	CYGNUS_PIN_GROUP(uart4, 0x10, 16, 1),
+	CYGNUS_PIN_GROUP(sw_led2_0, 0x10, 16, 2),
+	CYGNUS_PIN_GROUP(lcd, 0x10, 20, 0),
+	CYGNUS_PIN_GROUP(sram_0, 0x10, 20, 1),
+	CYGNUS_PIN_GROUP(spi5, 0x10, 20, 2),
+	CYGNUS_PIN_GROUP(uart0, 0x14, 0, 0),
+	CYGNUS_PIN_GROUP(sw_led0_1, 0x14, 0, 2),
+	CYGNUS_PIN_GROUP(uart1_dte, 0x14, 4, 0),
+	CYGNUS_PIN_GROUP(uart2, 0x14, 4, 1),
+	CYGNUS_PIN_GROUP(uart1, 0x14, 8, 0),
+	CYGNUS_PIN_GROUP(uart3, 0x14, 12, 0),
+	CYGNUS_PIN_GROUP(qspi_0, 0x14, 16, 0),
+	CYGNUS_PIN_GROUP(nand, 0x14, 20, 0),
+	CYGNUS_PIN_GROUP(sdio0_cd, 0x18, 0, 0),
+	CYGNUS_PIN_GROUP(sdio0_mmc, 0x18, 4, 0),
+	CYGNUS_PIN_GROUP(sdio1_data_0, 0x18, 8, 0),
+	CYGNUS_PIN_GROUP(can0, 0x18, 8, 1),
+	CYGNUS_PIN_GROUP(spi4_0, 0x18, 8, 2),
+	CYGNUS_PIN_GROUP(sdio1_data_1, 0x18, 12, 0),
+	CYGNUS_PIN_GROUP(can1, 0x18, 12, 1),
+	CYGNUS_PIN_GROUP(spi4_1, 0x18, 12, 2),
+	CYGNUS_PIN_GROUP(sdio1_cd, 0x18, 16, 0),
+	CYGNUS_PIN_GROUP(sdio1_led, 0x18, 20, 0),
+	CYGNUS_PIN_GROUP(sw_led2_1, 0x18, 20, 2),
+	CYGNUS_PIN_GROUP(sdio1_mmc, 0x18, 24, 0),
+	CYGNUS_PIN_GROUP(cam_led, 0x1c, 0, 0),
+	CYGNUS_PIN_GROUP(sw_led1, 0x1c, 0, 1),
+	CYGNUS_PIN_GROUP(cam_0, 0x1c, 4, 0),
+	CYGNUS_PIN_GROUP(cam_1, 0x1c, 8, 0),
+	CYGNUS_PIN_GROUP(sram_1, 0x1c, 8, 1),
+	CYGNUS_PIN_GROUP(qspi_1, 0x1c, 12, 0),
+	CYGNUS_PIN_GROUP(bsc1, 0x1c, 16, 0),
+	CYGNUS_PIN_GROUP(pcie_clkreq, 0x1c, 16, 1),
+	CYGNUS_PIN_GROUP(smart_card0_fcb, 0x20, 0, 0),
+	CYGNUS_PIN_GROUP(i2s0_1, 0x20, 0, 1),
+	CYGNUS_PIN_GROUP(smart_card1_fcb, 0x20, 4, 0),
+	CYGNUS_PIN_GROUP(i2s1_1, 0x20, 4, 1),
+	CYGNUS_PIN_GROUP(gpio0_3p3, 0x28, 0, 0),
+	CYGNUS_PIN_GROUP(usb0_oc, 0x28, 0, 1),
+	CYGNUS_PIN_GROUP(gpio1_3p3, 0x28, 4, 0),
+	CYGNUS_PIN_GROUP(usb1_oc, 0x28, 4, 1),
+	CYGNUS_PIN_GROUP(gpio2_3p3, 0x28, 8, 0),
+	CYGNUS_PIN_GROUP(usb2_oc, 0x28, 8, 1),
+};
+
+/*
+ * List of groups supported by functions
+ */
+static const char * const i2s0_grps[] = { "i2s0_0_grp", "i2s0_1_grp" };
+static const char * const i2s1_grps[] = { "i2s1_0_grp", "i2s1_1_grp" };
+static const char * const i2s2_grps[] = { "i2s2_0_grp", "i2s2_1_grp",
+	"i2s2_2_grp", "i2s2_3_grp", "i2s2_4_grp" };
+static const char * const spdif_grps[] = { "spdif_grp" };
+static const char * const pwm0_grps[] = { "pwm0_grp" };
+static const char * const pwm1_grps[] = { "pwm1_grp" };
+static const char * const pwm2_grps[] = { "pwm2_grp" };
+static const char * const pwm3_grps[] = { "pwm3_grp" };
+static const char * const pwm4_grps[] = { "pwm4_grp" };
+static const char * const pwm5_grps[] = { "pwm5_grp" };
+static const char * const key_grps[] = { "key0_grp", "key1_grp", "key2_grp",
+	"key3_grp", "key4_grp", "key5_grp", "key6_grp", "key7_grp", "key8_grp",
+	"key9_grp", "key10_grp", "key11_grp", "key12_grp", "key13_grp",
+	"key14_grp", "key15_grp" };
+static const char * const audio_dte_grps[] = { "audio_dte0_grp",
+	"audio_dte1_grp", "audio_dte2_grp", "audio_dte3_grp" };
+static const char * const smart_card0_grps[] = { "smart_card0_grp",
+	"smart_card0_fcb_grp" };
+static const char * const smart_card1_grps[] = { "smart_card1_grp",
+	"smart_card1_fcb_grp" };
+static const char * const spi0_grps[] = { "spi0_grp" };
+static const char * const spi1_grps[] = { "spi1_grp" };
+static const char * const spi2_grps[] = { "spi2_grp" };
+static const char * const spi3_grps[] = { "spi3_grp" };
+static const char * const spi4_grps[] = { "spi4_0_grp", "spi4_1_grp" };
+static const char * const spi5_grps[] = { "spi5_grp" };
+
+static const char * const sw_led0_grps[] = { "sw_led0_0_grp",
+	"sw_led0_1_grp" };
+static const char * const sw_led1_grps[] = { "sw_led1_grp" };
+static const char * const sw_led2_grps[] = { "sw_led2_0_grp",
+	"sw_led2_1_grp" };
+static const char * const d1w_grps[] = { "d1w_grp" };
+static const char * const lcd_grps[] = { "lcd_grp" };
+static const char * const sram_grps[] = { "sram_0_grp", "sram_1_grp" };
+
+static const char * const uart0_grps[] = { "uart0_grp" };
+static const char * const uart1_grps[] = { "uart1_grp", "uart1_dte_grp" };
+static const char * const uart2_grps[] = { "uart2_grp" };
+static const char * const uart3_grps[] = { "uart3_grp" };
+static const char * const uart4_grps[] = { "uart4_grp" };
+static const char * const qspi_grps[] = { "qspi_0_grp", "qspi_1_grp" };
+static const char * const nand_grps[] = { "nand_grp" };
+static const char * const sdio0_grps[] = { "sdio0_grp", "sdio0_cd_grp",
+	"sdio0_mmc_grp" };
+static const char * const sdio1_grps[] = { "sdio1_data_0_grp",
+	"sdio1_data_1_grp", "sdio1_cd_grp", "sdio1_led_grp", "sdio1_mmc_grp" };
+static const char * const can0_grps[] = { "can0_grp" };
+static const char * const can1_grps[] = { "can1_grp" };
+static const char * const cam_grps[] = { "cam_led_grp", "cam_0_grp",
+	"cam_1_grp" };
+static const char * const bsc1_grps[] = { "bsc1_grp" };
+static const char * const pcie_clkreq_grps[] = { "pcie_clkreq_grp" };
+static const char * const usb0_oc_grps[] = { "usb0_oc_grp" };
+static const char * const usb1_oc_grps[] = { "usb1_oc_grp" };
+static const char * const usb2_oc_grps[] = { "usb2_oc_grp" };
+
+#define CYGNUS_PIN_FUNCTION(func)				\
+{								\
+	.name = #func,						\
+	.groups = func ## _grps,				\
+	.num_groups = ARRAY_SIZE(func ## _grps),		\
+}
+
+/*
+ * List of supported functions in Cygnus
+ */
+static const struct cygnus_pin_function cygnus_pin_functions[] = {
+	CYGNUS_PIN_FUNCTION(i2s0),
+	CYGNUS_PIN_FUNCTION(i2s1),
+	CYGNUS_PIN_FUNCTION(i2s2),
+	CYGNUS_PIN_FUNCTION(spdif),
+	CYGNUS_PIN_FUNCTION(pwm0),
+	CYGNUS_PIN_FUNCTION(pwm1),
+	CYGNUS_PIN_FUNCTION(pwm2),
+	CYGNUS_PIN_FUNCTION(pwm3),
+	CYGNUS_PIN_FUNCTION(pwm4),
+	CYGNUS_PIN_FUNCTION(pwm5),
+	CYGNUS_PIN_FUNCTION(key),
+	CYGNUS_PIN_FUNCTION(audio_dte),
+	CYGNUS_PIN_FUNCTION(smart_card0),
+	CYGNUS_PIN_FUNCTION(smart_card1),
+	CYGNUS_PIN_FUNCTION(spi0),
+	CYGNUS_PIN_FUNCTION(spi1),
+	CYGNUS_PIN_FUNCTION(spi2),
+	CYGNUS_PIN_FUNCTION(spi3),
+	CYGNUS_PIN_FUNCTION(spi4),
+	CYGNUS_PIN_FUNCTION(spi5),
+	CYGNUS_PIN_FUNCTION(sw_led0),
+	CYGNUS_PIN_FUNCTION(sw_led1),
+	CYGNUS_PIN_FUNCTION(sw_led2),
+	CYGNUS_PIN_FUNCTION(d1w),
+	CYGNUS_PIN_FUNCTION(lcd),
+	CYGNUS_PIN_FUNCTION(sram),
+	CYGNUS_PIN_FUNCTION(uart0),
+	CYGNUS_PIN_FUNCTION(uart1),
+	CYGNUS_PIN_FUNCTION(uart2),
+	CYGNUS_PIN_FUNCTION(uart3),
+	CYGNUS_PIN_FUNCTION(uart4),
+	CYGNUS_PIN_FUNCTION(qspi),
+	CYGNUS_PIN_FUNCTION(nand),
+	CYGNUS_PIN_FUNCTION(sdio0),
+	CYGNUS_PIN_FUNCTION(sdio1),
+	CYGNUS_PIN_FUNCTION(can0),
+	CYGNUS_PIN_FUNCTION(can1),
+	CYGNUS_PIN_FUNCTION(cam),
+	CYGNUS_PIN_FUNCTION(bsc1),
+	CYGNUS_PIN_FUNCTION(pcie_clkreq),
+	CYGNUS_PIN_FUNCTION(usb0_oc),
+	CYGNUS_PIN_FUNCTION(usb1_oc),
+	CYGNUS_PIN_FUNCTION(usb2_oc),
+};
+
+static int cygnus_get_groups_count(struct pinctrl_dev *pctrl_dev)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->num_groups;
+}
+
+static const char *cygnus_get_group_name(struct pinctrl_dev *pctrl_dev,
+					 unsigned selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->groups[selector].name;
+}
+
+static int cygnus_get_group_pins(struct pinctrl_dev *pctrl_dev,
+				 unsigned selector, const unsigned **pins,
+				 unsigned *num_pins)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	*pins = pinctrl->groups[selector].pins;
+	*num_pins = pinctrl->groups[selector].num_pins;
+
+	return 0;
+}
+
+static void cygnus_pin_dbg_show(struct pinctrl_dev *pctrl_dev,
+				struct seq_file *s, unsigned offset)
+{
+	seq_printf(s, " %s", dev_name(pctrl_dev->dev));
+}
+
+static bool cygnus_function_is_valid(const char *function_name)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(cygnus_pin_functions); i++) {
+		if (!strcmp(cygnus_pin_functions[i].name, function_name))
+			return true;
+	}
+
+	return false;
+}
+
+/*
+ * TODO: Use API from pinctrl framework once "groups" parsing is supported
+ */
+static int cygnus_dt_node_to_map(struct pinctrl_dev *pctrl_dev,
+				 struct device_node *np,
+				 struct pinctrl_map **map,
+				 unsigned *num_maps)
+{
+	int ret, num_groups;
+	unsigned reserved_maps = 0;
+	struct property *prop;
+	const char *group_name, *function_name;
+
+	*map = NULL;
+	*num_maps = 0;
+
+	num_groups = of_property_count_strings(np, "groups");
+	if (num_groups < 0) {
+		dev_err(pctrl_dev->dev, "could not parse property groups\n");
+		return -EINVAL;
+	}
+
+	ret = of_property_read_string(np, "function", &function_name);
+	if (ret < 0) {
+		dev_err(pctrl_dev->dev,	"could not parse property function\n");
+		return -EINVAL;
+	}
+
+	/* check if it's a valid function */
+	if (!cygnus_function_is_valid(function_name)) {
+		dev_warn(pctrl_dev->dev, "invalid function name: %s\n",
+				function_name);
+	}
+
+	ret = pinctrl_utils_reserve_map(pctrl_dev, map, &reserved_maps,
+			num_maps, num_groups);
+	if (ret) {
+		dev_err(pctrl_dev->dev, "unable to reserve map\n");
+		return ret;
+	}
+
+	of_property_for_each_string(np, "groups", prop, group_name) {
+		ret = pinctrl_utils_add_map_mux(pctrl_dev, map,
+				&reserved_maps, num_maps, group_name,
+				function_name);
+		if (ret) {
+			dev_err(pctrl_dev->dev, "can't add map: %d\n", ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static const struct pinctrl_ops cygnus_pinctrl_ops = {
+	.get_groups_count = cygnus_get_groups_count,
+	.get_group_name = cygnus_get_group_name,
+	.get_group_pins = cygnus_get_group_pins,
+	.pin_dbg_show = cygnus_pin_dbg_show,
+	.dt_node_to_map = cygnus_dt_node_to_map,
+	.dt_free_map = pinctrl_utils_dt_free_map,
+};
+
+static int cygnus_get_functions_count(struct pinctrl_dev *pctrl_dev)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->num_functions;
+}
+
+static const char *cygnus_get_function_name(struct pinctrl_dev *pctrl_dev,
+					    unsigned selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->functions[selector].name;
+}
+
+static int cygnus_get_function_groups(struct pinctrl_dev *pctrl_dev,
+				      unsigned selector,
+				      const char * const **groups,
+				      unsigned * const num_groups)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	*groups = pinctrl->functions[selector].groups;
+	*num_groups = pinctrl->functions[selector].num_groups;
+
+	return 0;
+}
+
+static int cygnus_pinmux_set(struct cygnus_pinctrl *pinctrl,
+			     const struct cygnus_pin_function *func,
+			     const struct cygnus_pin_group *grp,
+			     struct cygnus_mux_log *mux_log)
+{
+	const struct cygnus_mux *mux = &grp->mux;
+	int i;
+	u32 val, mask = 0x7;
+	unsigned long flags;
+
+	for (i = 0; i < CYGNUS_NUM_IOMUX; i++) {
+		if (mux->offset != mux_log[i].mux.offset ||
+		    mux->shift != mux_log[i].mux.shift)
+			continue;
+
+		/* match found if we reach here */
+
+		/* if this is a new configuration, just do it! */
+		if (!mux_log[i].is_configured)
+			break;
+
+		/*
+		 * IOMUX has been configured previously and one is trying to
+		 * configure it to a different function
+		 */
+		if (mux_log[i].mux.alt != mux->alt) {
+			dev_err(pinctrl->dev,
+				"double configuration error detected!\n");
+			dev_err(pinctrl->dev, "func:%s grp:%s\n",
+				func->name, grp->name);
+			return -EINVAL;
+		} else {
+			/*
+			 * One tries to configure it to the same function.
+			 * Just quit and don't bother
+			 */
+			return 0;
+		}
+	}
+
+	mux_log[i].mux.alt = mux->alt;
+	mux_log[i].is_configured = true;
+
+	spin_lock_irqsave(&pinctrl->lock, flags);
+
+	val = readl(pinctrl->base0 + grp->mux.offset);
+	val &= ~(mask << grp->mux.shift);
+	val |= grp->mux.alt << grp->mux.shift;
+	writel(val, pinctrl->base0 + grp->mux.offset);
+
+	spin_unlock_irqrestore(&pinctrl->lock, flags);
+
+	return 0;
+}
+
+static int cygnus_pinmux_set_mux(struct pinctrl_dev *pctrl_dev,
+				 unsigned func_select, unsigned grp_select)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+	const struct cygnus_pin_function *func =
+		&pinctrl->functions[func_select];
+	const struct cygnus_pin_group *grp = &pinctrl->groups[grp_select];
+
+	dev_dbg(pctrl_dev->dev, "func:%u name:%s grp:%u name:%s\n",
+		func_select, func->name, grp_select, grp->name);
+
+	dev_dbg(pctrl_dev->dev, "offset:0x%08x shift:%u alt:%u\n",
+		grp->mux.offset, grp->mux.shift, grp->mux.alt);
+
+	return cygnus_pinmux_set(pinctrl, func, grp, pinctrl->mux_log);
+}
+
+static int cygnus_gpio_request_enable(struct pinctrl_dev *pctrl_dev,
+				      struct pinctrl_gpio_range *range,
+				      unsigned pin)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+	const struct cygnus_gpio_mux *mux = pctrl_dev->desc->pins[pin].drv_data;
+	u32 val;
+	unsigned long flags;
+
+	/* not all pins support GPIO pinmux override */
+	if (!mux->is_supported)
+		return -ENOTSUPP;
+
+	spin_lock_irqsave(&pinctrl->lock, flags);
+
+	val = readl(pinctrl->base1 + mux->offset);
+	val |= 0x3 << mux->shift;
+	writel(val, pinctrl->base1 + mux->offset);
+
+	spin_unlock_irqrestore(&pinctrl->lock, flags);
+
+	dev_dbg(pctrl_dev->dev,
+		"gpio request enable pin=%u offset=0x%x shift=%u\n",
+		pin, mux->offset, mux->shift);
+
+	return 0;
+}
+
+static void cygnus_gpio_disable_free(struct pinctrl_dev *pctrl_dev,
+				     struct pinctrl_gpio_range *range,
+				     unsigned pin)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+	struct cygnus_gpio_mux *mux = pctrl_dev->desc->pins[pin].drv_data;
+	u32 val;
+	unsigned long flags;
+
+	if (!mux->is_supported)
+		return;
+
+	spin_lock_irqsave(&pinctrl->lock, flags);
+
+	val = readl(pinctrl->base1 + mux->offset);
+	val &= ~(0x3 << mux->shift);
+	writel(val, pinctrl->base1 + mux->offset);
+
+	spin_unlock_irqrestore(&pinctrl->lock, flags);
+
+	dev_err(pctrl_dev->dev,
+		"gpio disable free pin=%u offset=0x%x shift=%u\n",
+		pin, mux->offset, mux->shift);
+}
+
+static const struct pinmux_ops cygnus_pinmux_ops = {
+	.get_functions_count = cygnus_get_functions_count,
+	.get_function_name = cygnus_get_function_name,
+	.get_function_groups = cygnus_get_function_groups,
+	.set_mux = cygnus_pinmux_set_mux,
+	.gpio_request_enable = cygnus_gpio_request_enable,
+	.gpio_disable_free = cygnus_gpio_disable_free,
+};
+
+static struct pinctrl_desc cygnus_pinctrl_desc = {
+	.name = "cygnus-pinmux",
+	.pctlops = &cygnus_pinctrl_ops,
+	.pmxops = &cygnus_pinmux_ops,
+};
+
+static int cygnus_mux_log_init(struct cygnus_pinctrl *pinctrl)
+{
+	struct cygnus_mux_log *log;
+	unsigned int i, j;
+
+	pinctrl->mux_log = devm_kcalloc(pinctrl->dev, CYGNUS_NUM_IOMUX,
+					sizeof(struct cygnus_mux_log),
+					GFP_KERNEL);
+	if (!pinctrl->mux_log)
+		return -ENOMEM;
+
+	log = pinctrl->mux_log;
+	for (i = 0; i < CYGNUS_NUM_IOMUX_REGS; i++) {
+		for (j = 0; j < CYGNUS_NUM_MUX_PER_REG; j++) {
+			log = &pinctrl->mux_log[i * CYGNUS_NUM_MUX_PER_REG
+				+ j];
+			log->mux.offset = i * 4;
+			log->mux.shift = j * 4;
+			log->mux.alt = 0;
+			log->is_configured = false;
+		}
+	}
+
+	return 0;
+}
+
+static int cygnus_pinmux_probe(struct platform_device *pdev)
+{
+	struct cygnus_pinctrl *pinctrl;
+	struct resource *res;
+	int i, ret;
+	struct pinctrl_pin_desc *pins;
+	unsigned num_pins = ARRAY_SIZE(cygnus_pins);
+
+	pinctrl = devm_kzalloc(&pdev->dev, sizeof(*pinctrl), GFP_KERNEL);
+	if (!pinctrl)
+		return -ENOMEM;
+
+	pinctrl->dev = &pdev->dev;
+	platform_set_drvdata(pdev, pinctrl);
+	spin_lock_init(&pinctrl->lock);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	pinctrl->base0 = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(pinctrl->base0)) {
+		dev_err(&pdev->dev, "unable to map I/O space\n");
+		return PTR_ERR(pinctrl->base0);
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	pinctrl->base1 = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(pinctrl->base1)) {
+		dev_err(&pdev->dev, "unable to map I/O space\n");
+		return PTR_ERR(pinctrl->base1);
+	}
+
+	ret = cygnus_mux_log_init(pinctrl);
+	if (ret) {
+		dev_err(&pdev->dev, "unable to initialize IOMUX log\n");
+		return ret;
+	}
+
+	pins = devm_kcalloc(&pdev->dev, num_pins, sizeof(*pins), GFP_KERNEL);
+	if (!pins)
+		return -ENOMEM;
+
+	for (i = 0; i < num_pins; i++) {
+		pins[i].number = cygnus_pins[i].pin;
+		pins[i].name = cygnus_pins[i].name;
+		pins[i].drv_data = &cygnus_pins[i].gpio_mux;
+	}
+
+	pinctrl->groups = cygnus_pin_groups;
+	pinctrl->num_groups = ARRAY_SIZE(cygnus_pin_groups);
+	pinctrl->functions = cygnus_pin_functions;
+	pinctrl->num_functions = ARRAY_SIZE(cygnus_pin_functions);
+	cygnus_pinctrl_desc.pins = pins;
+	cygnus_pinctrl_desc.npins = num_pins;
+
+	pinctrl->pctl = pinctrl_register(&cygnus_pinctrl_desc, &pdev->dev,
+			pinctrl);
+	if (!pinctrl->pctl) {
+		dev_err(&pdev->dev, "unable to register Cygnus IOMUX pinctrl\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static struct of_device_id cygnus_pinmux_of_match[] = {
+	{ .compatible = "brcm,cygnus-pinmux" },
+	{ }
+};
+
+static struct platform_driver cygnus_pinmux_driver = {
+	.driver = {
+		.name = "cygnus-pinmux",
+		.of_match_table = cygnus_pinmux_of_match,
+		.suppress_bind_attrs = true,
+	},
+	.probe = cygnus_pinmux_probe,
+};
+
+static int __init cygnus_pinmux_init(void)
+{
+	return platform_driver_register(&cygnus_pinmux_driver);
+}
+arch_initcall(cygnus_pinmux_init);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus IOMUX driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v4 3/4] pinctrl: cygnus: add initial IOMUX driver support

[Ray Jui]

This adds the initial driver support for the Broadcom Cygnus IOMUX
controller. The Cygnus IOMUX controller supports group based mux
configuration but allows certain pins to be muxed to GPIO individually

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/pinctrl/bcm/Kconfig              |   13 +
 drivers/pinctrl/bcm/Makefile             |    5 +-
 drivers/pinctrl/bcm/pinctrl-cygnus-mux.c | 1088 ++++++++++++++++++++++++++++++
 3 files changed, 1104 insertions(+), 2 deletions(-)
 create mode 100644 drivers/pinctrl/bcm/pinctrl-cygnus-mux.c

diff --git a/drivers/pinctrl/bcm/Kconfig b/drivers/pinctrl/bcm/Kconfig
index bc6d048..eb13201 100644
--- a/drivers/pinctrl/bcm/Kconfig
+++ b/drivers/pinctrl/bcm/Kconfig
@@ -19,3 +19,16 @@ config PINCTRL_BCM2835
 	bool
 	select PINMUX
 	select PINCONF
+
+config PINCTRL_CYGNUS_MUX
+	bool "Broadcom Cygnus IOMUX driver"
+	depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
+	select PINMUX
+	select GENERIC_PINCONF
+	default ARCH_BCM_CYGNUS
+	help
+	  Say yes here to enable the Broadcom Cygnus IOMUX driver.
+
+	  The Broadcom Cygnus IOMUX driver supports group based IOMUX
+	  configuration, with the exception that certain individual pins
+	  can be overrided to GPIO function
diff --git a/drivers/pinctrl/bcm/Makefile b/drivers/pinctrl/bcm/Makefile
index 7ba80a3..bb6beb6 100644
--- a/drivers/pinctrl/bcm/Makefile
+++ b/drivers/pinctrl/bcm/Makefile
@@ -1,4 +1,5 @@
 # Broadcom pinctrl support
 
-obj-$(CONFIG_PINCTRL_BCM281XX)	+= pinctrl-bcm281xx.o
-obj-$(CONFIG_PINCTRL_BCM2835)	+= pinctrl-bcm2835.o
+obj-$(CONFIG_PINCTRL_BCM281XX)		+= pinctrl-bcm281xx.o
+obj-$(CONFIG_PINCTRL_BCM2835)		+= pinctrl-bcm2835.o
+obj-$(CONFIG_PINCTRL_CYGNUS_MUX)	+= pinctrl-cygnus-mux.o
diff --git a/drivers/pinctrl/bcm/pinctrl-cygnus-mux.c b/drivers/pinctrl/bcm/pinctrl-cygnus-mux.c
new file mode 100644
index 0000000..c4c4ed2
--- /dev/null
+++ b/drivers/pinctrl/bcm/pinctrl-cygnus-mux.c
@@ -0,0 +1,1088 @@
+/* Copyright (C) 2014-2015 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * This file contains the Cygnus IOMUX driver that supports group based PINMUX
+ * configuration. Although PINMUX configuration is mainly group based, the
+ * Cygnus IOMUX controller allows certain pins to be individually muxed to GPIO
+ * function, and therefore be controlled by the Cygnus ASIU GPIO controller
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include "../core.h"
+#include "../pinctrl-utils.h"
+
+#define CYGNUS_NUM_IOMUX_REGS     8
+#define CYGNUS_NUM_MUX_PER_REG    8
+#define CYGNUS_NUM_IOMUX          (CYGNUS_NUM_IOMUX_REGS * \
+				   CYGNUS_NUM_MUX_PER_REG)
+
+/*
+ * Cygnus IOMUX register description
+ *
+ * @offset: register offset for mux configuration of a group
+ * @shift: bit shift for mux configuration of a group
+ * @alt: alternate function to set to
+ */
+struct cygnus_mux {
+	unsigned int offset;
+	unsigned int shift;
+	unsigned int alt;
+};
+
+/*
+ * Keep track of Cygnus IOMUX configuration and prevent double configuration
+ *
+ * @cygnus_mux: Cygnus IOMUX register description
+ * @is_configured: flag to indicate whether a mux setting has already been
+ * configured
+ */
+struct cygnus_mux_log {
+	struct cygnus_mux mux;
+	bool is_configured;
+};
+
+/*
+ * Group based IOMUX configuration
+ *
+ * @name: name of the group
+ * @pins: array of pins used by this group
+ * @num_pins: total number of pins used by this group
+ * @mux: Cygnus group based IOMUX configuration
+ */
+struct cygnus_pin_group {
+	const char *name;
+	const unsigned *pins;
+	unsigned num_pins;
+	struct cygnus_mux mux;
+};
+
+/*
+ * Cygnus mux function and supported pin groups
+ *
+ * @name: name of the function
+ * @groups: array of groups that can be supported by this function
+ * @num_groups: total number of groups that can be supported by this function
+ */
+struct cygnus_pin_function {
+	const char *name;
+	const char * const *groups;
+	unsigned num_groups;
+};
+
+/*
+ * Cygnus IOMUX pinctrl core
+ *
+ * @pctl: pointer to pinctrl_dev
+ * @dev: pointer to device
+ * @base0: first I/O register base of the Cygnus IOMUX controller
+ * @base1: second I/O register base
+ * @groups: pointer to array of groups
+ * @num_groups: total number of groups
+ * @functions: pointer to array of functions
+ * @num_functions: total number of functions
+ * @mux_log: pointer to the array of mux logs
+ * @lock: lock to protect register access
+ */
+struct cygnus_pinctrl {
+	struct pinctrl_dev *pctl;
+	struct device *dev;
+	void __iomem *base0;
+	void __iomem *base1;
+
+	const struct cygnus_pin_group *groups;
+	unsigned num_groups;
+
+	const struct cygnus_pin_function *functions;
+	unsigned num_functions;
+
+	struct cygnus_mux_log *mux_log;
+
+	spinlock_t lock;
+};
+
+/*
+ * Certain pins can be individually muxed to GPIO function
+ *
+ * @is_supported: flag to indicate GPIO mux is supported for this pin
+ * @offset: register offset for GPIO mux override of a pin
+ * @shift: bit shift for GPIO mux override of a pin
+ */
+struct cygnus_gpio_mux {
+	int is_supported;
+	unsigned int offset;
+	unsigned int shift;
+};
+
+/*
+ * Description of a pin in Cygnus
+ *
+ * @pin: pin number
+ * @name: pin name
+ * @gpio_mux: GPIO override related information
+ */
+struct cygnus_pin {
+	unsigned pin;
+	char *name;
+	struct cygnus_gpio_mux gpio_mux;
+};
+
+#define CYGNUS_PIN_DESC(p, n, i, o, s)	\
+{					\
+	.pin = p,			\
+	.name = n,			\
+	.gpio_mux = {			\
+		.is_supported = i,	\
+		.offset = o,		\
+		.shift = s,		\
+	},				\
+}
+
+/*
+ * List of pins in Cygnus
+ */
+static struct cygnus_pin cygnus_pins[] = {
+	CYGNUS_PIN_DESC(0, "ext_device_reset_n", 0, 0, 0),
+	CYGNUS_PIN_DESC(1, "chip_mode0", 0, 0, 0),
+	CYGNUS_PIN_DESC(2, "chip_mode1", 0, 0, 0),
+	CYGNUS_PIN_DESC(3, "chip_mode2", 0, 0, 0),
+	CYGNUS_PIN_DESC(4, "chip_mode3", 0, 0, 0),
+	CYGNUS_PIN_DESC(5, "chip_mode4", 0, 0, 0),
+	CYGNUS_PIN_DESC(6, "bsc0_scl", 0, 0, 0),
+	CYGNUS_PIN_DESC(7, "bsc0_sda", 0, 0, 0),
+	CYGNUS_PIN_DESC(8, "bsc1_scl", 0, 0, 0),
+	CYGNUS_PIN_DESC(9, "bsc1_sda", 0, 0, 0),
+	CYGNUS_PIN_DESC(10, "d1w_dq", 1, 0x28, 0),
+	CYGNUS_PIN_DESC(11, "d1wowstz_l", 1, 0x4, 28),
+	CYGNUS_PIN_DESC(12, "gpio0", 0, 0, 0),
+	CYGNUS_PIN_DESC(13, "gpio1", 0, 0, 0),
+	CYGNUS_PIN_DESC(14, "gpio2", 0, 0, 0),
+	CYGNUS_PIN_DESC(15, "gpio3", 0, 0, 0),
+	CYGNUS_PIN_DESC(16, "gpio4", 0, 0, 0),
+	CYGNUS_PIN_DESC(17, "gpio5", 0, 0, 0),
+	CYGNUS_PIN_DESC(18, "gpio6", 0, 0, 0),
+	CYGNUS_PIN_DESC(19, "gpio7", 0, 0, 0),
+	CYGNUS_PIN_DESC(20, "gpio8", 0, 0, 0),
+	CYGNUS_PIN_DESC(21, "gpio9", 0, 0, 0),
+	CYGNUS_PIN_DESC(22, "gpio10", 0, 0, 0),
+	CYGNUS_PIN_DESC(23, "gpio11", 0, 0, 0),
+	CYGNUS_PIN_DESC(24, "gpio12", 0, 0, 0),
+	CYGNUS_PIN_DESC(25, "gpio13", 0, 0, 0),
+	CYGNUS_PIN_DESC(26, "gpio14", 0, 0, 0),
+	CYGNUS_PIN_DESC(27, "gpio15", 0, 0, 0),
+	CYGNUS_PIN_DESC(28, "gpio16", 0, 0, 0),
+	CYGNUS_PIN_DESC(29, "gpio17", 0, 0, 0),
+	CYGNUS_PIN_DESC(30, "gpio18", 0, 0, 0),
+	CYGNUS_PIN_DESC(31, "gpio19", 0, 0, 0),
+	CYGNUS_PIN_DESC(32, "gpio20", 0, 0, 0),
+	CYGNUS_PIN_DESC(33, "gpio21", 0, 0, 0),
+	CYGNUS_PIN_DESC(34, "gpio22", 0, 0, 0),
+	CYGNUS_PIN_DESC(35, "gpio23", 0, 0, 0),
+	CYGNUS_PIN_DESC(36, "mdc", 0, 0, 0),
+	CYGNUS_PIN_DESC(37, "mdio", 0, 0, 0),
+	CYGNUS_PIN_DESC(38, "pwm0", 1, 0x10, 30),
+	CYGNUS_PIN_DESC(39, "pwm1", 1, 0x10, 28),
+	CYGNUS_PIN_DESC(40, "pwm2", 1, 0x10, 26),
+	CYGNUS_PIN_DESC(41, "pwm3", 1, 0x10, 24),
+	CYGNUS_PIN_DESC(42, "sc0_clk", 1, 0x10, 22),
+	CYGNUS_PIN_DESC(43, "sc0_cmdvcc_l", 1, 0x10, 20),
+	CYGNUS_PIN_DESC(44, "sc0_detect", 1, 0x10, 18),
+	CYGNUS_PIN_DESC(45, "sc0_fcb", 1, 0x10, 16),
+	CYGNUS_PIN_DESC(46, "sc0_io", 1, 0x10, 14),
+	CYGNUS_PIN_DESC(47, "sc0_rst_l", 1, 0x10, 12),
+	CYGNUS_PIN_DESC(48, "sc1_clk", 1, 0x10, 10),
+	CYGNUS_PIN_DESC(49, "sc1_cmdvcc_l", 1, 0x10, 8),
+	CYGNUS_PIN_DESC(50, "sc1_detect", 1, 0x10, 6),
+	CYGNUS_PIN_DESC(51, "sc1_fcb", 1, 0x10, 4),
+	CYGNUS_PIN_DESC(52, "sc1_io", 1, 0x10, 2),
+	CYGNUS_PIN_DESC(53, "sc1_rst_l", 1, 0x10, 0),
+	CYGNUS_PIN_DESC(54, "spi0_clk", 1, 0x18, 10),
+	CYGNUS_PIN_DESC(55, "spi0_mosi", 1, 0x18, 6),
+	CYGNUS_PIN_DESC(56, "spi0_miso", 1, 0x18, 8),
+	CYGNUS_PIN_DESC(57, "spi0_ss", 1, 0x18, 4),
+	CYGNUS_PIN_DESC(58, "spi1_clk", 1, 0x18, 2),
+	CYGNUS_PIN_DESC(59, "spi1_mosi", 1, 0x1c, 30),
+	CYGNUS_PIN_DESC(60, "spi1_miso", 1, 0x18, 0),
+	CYGNUS_PIN_DESC(61, "spi1_ss", 1, 0x1c, 28),
+	CYGNUS_PIN_DESC(62, "spi2_clk", 1, 0x1c, 26),
+	CYGNUS_PIN_DESC(63, "spi2_mosi", 1, 0x1c, 22),
+	CYGNUS_PIN_DESC(64, "spi2_miso", 1, 0x1c, 24),
+	CYGNUS_PIN_DESC(65, "spi2_ss", 1, 0x1c, 20),
+	CYGNUS_PIN_DESC(66, "spi3_clk", 1, 0x1c, 18),
+	CYGNUS_PIN_DESC(67, "spi3_mosi", 1, 0x1c, 14),
+	CYGNUS_PIN_DESC(68, "spi3_miso", 1, 0x1c, 16),
+	CYGNUS_PIN_DESC(69, "spi3_ss", 1, 0x1c, 12),
+	CYGNUS_PIN_DESC(70, "uart0_cts", 1, 0x1c, 10),
+	CYGNUS_PIN_DESC(71, "uart0_rts", 1, 0x1c, 8),
+	CYGNUS_PIN_DESC(72, "uart0_rx", 1, 0x1c, 6),
+	CYGNUS_PIN_DESC(73, "uart0_tx", 1, 0x1c, 4),
+	CYGNUS_PIN_DESC(74, "uart1_cts", 1, 0x1c, 2),
+	CYGNUS_PIN_DESC(75, "uart1_dcd", 1, 0x1c, 0),
+	CYGNUS_PIN_DESC(76, "uart1_dsr", 1, 0x20, 14),
+	CYGNUS_PIN_DESC(77, "uart1_dtr", 1, 0x20, 12),
+	CYGNUS_PIN_DESC(78, "uart1_ri", 1, 0x20, 10),
+	CYGNUS_PIN_DESC(79, "uart1_rts", 1, 0x20, 8),
+	CYGNUS_PIN_DESC(80, "uart1_rx", 1, 0x20, 6),
+	CYGNUS_PIN_DESC(81, "uart1_tx", 1, 0x20, 4),
+	CYGNUS_PIN_DESC(82, "uart3_rx", 1, 0x20, 2),
+	CYGNUS_PIN_DESC(83, "uart3_tx", 1, 0x20, 0),
+	CYGNUS_PIN_DESC(84, "sdio1_clk_sdcard", 1, 0x14, 6),
+	CYGNUS_PIN_DESC(85, "sdio1_cmd", 1, 0x14, 4),
+	CYGNUS_PIN_DESC(86, "sdio1_data0", 1, 0x14, 2),
+	CYGNUS_PIN_DESC(87, "sdio1_data1", 1, 0x14, 0),
+	CYGNUS_PIN_DESC(88, "sdio1_data2", 1, 0x18, 30),
+	CYGNUS_PIN_DESC(89, "sdio1_data3", 1, 0x18, 28),
+	CYGNUS_PIN_DESC(90, "sdio1_wp_n", 1, 0x18, 24),
+	CYGNUS_PIN_DESC(91, "sdio1_card_rst", 1, 0x14, 10),
+	CYGNUS_PIN_DESC(92, "sdio1_led_on", 1, 0x18, 26),
+	CYGNUS_PIN_DESC(93, "sdio1_cd", 1, 0x14, 8),
+	CYGNUS_PIN_DESC(94, "sdio0_clk_sdcard", 1, 0x14, 26),
+	CYGNUS_PIN_DESC(95, "sdio0_cmd", 1, 0x14, 24),
+	CYGNUS_PIN_DESC(96, "sdio0_data0", 1, 0x14, 22),
+	CYGNUS_PIN_DESC(97, "sdio0_data1", 1, 0x14, 20),
+	CYGNUS_PIN_DESC(98, "sdio0_data2", 1, 0x14, 18),
+	CYGNUS_PIN_DESC(99, "sdio0_data3", 1, 0x14, 16),
+	CYGNUS_PIN_DESC(100, "sdio0_wp_n", 1, 0x14, 12),
+	CYGNUS_PIN_DESC(101, "sdio0_card_rst", 1, 0x14, 30),
+	CYGNUS_PIN_DESC(102, "sdio0_led_on", 1, 0x14, 14),
+	CYGNUS_PIN_DESC(103, "sdio0_cd", 1, 0x14, 28),
+	CYGNUS_PIN_DESC(104, "sflash_clk", 1, 0x18, 22),
+	CYGNUS_PIN_DESC(105, "sflash_cs_l", 1, 0x18, 20),
+	CYGNUS_PIN_DESC(106, "sflash_mosi", 1, 0x18, 14),
+	CYGNUS_PIN_DESC(107, "sflash_miso", 1, 0x18, 16),
+	CYGNUS_PIN_DESC(108, "sflash_wp_n", 1, 0x18, 12),
+	CYGNUS_PIN_DESC(109, "sflash_hold_n", 1, 0x18, 18),
+	CYGNUS_PIN_DESC(110, "nand_ale", 1, 0xc, 30),
+	CYGNUS_PIN_DESC(111, "nand_ce0_l", 1, 0xc, 28),
+	CYGNUS_PIN_DESC(112, "nand_ce1_l", 1, 0xc, 26),
+	CYGNUS_PIN_DESC(113, "nand_cle", 1, 0xc, 24),
+	CYGNUS_PIN_DESC(114, "nand_dq0", 1, 0xc, 22),
+	CYGNUS_PIN_DESC(115, "nand_dq1", 1, 0xc, 20),
+	CYGNUS_PIN_DESC(116, "nand_dq2", 1, 0xc, 18),
+	CYGNUS_PIN_DESC(117, "nand_dq3", 1, 0xc, 16),
+	CYGNUS_PIN_DESC(118, "nand_dq4", 1, 0xc, 14),
+	CYGNUS_PIN_DESC(119, "nand_dq5", 1, 0xc, 12),
+	CYGNUS_PIN_DESC(120, "nand_dq6", 1, 0xc, 10),
+	CYGNUS_PIN_DESC(121, "nand_dq7", 1, 0xc, 8),
+	CYGNUS_PIN_DESC(122, "nand_rb_l", 1, 0xc, 6),
+	CYGNUS_PIN_DESC(123, "nand_re_l", 1, 0xc, 4),
+	CYGNUS_PIN_DESC(124, "nand_we_l", 1, 0xc, 2),
+	CYGNUS_PIN_DESC(125, "nand_wp_l", 1, 0xc, 0),
+	CYGNUS_PIN_DESC(126, "lcd_clac", 1, 0x4, 26),
+	CYGNUS_PIN_DESC(127, "lcd_clcp", 1, 0x4, 24),
+	CYGNUS_PIN_DESC(128, "lcd_cld0", 1, 0x4, 22),
+	CYGNUS_PIN_DESC(129, "lcd_cld1", 1, 0x4, 0),
+	CYGNUS_PIN_DESC(130, "lcd_cld10", 1, 0x4, 20),
+	CYGNUS_PIN_DESC(131, "lcd_cld11", 1, 0x4, 18),
+	CYGNUS_PIN_DESC(132, "lcd_cld12", 1, 0x4, 16),
+	CYGNUS_PIN_DESC(133, "lcd_cld13", 1, 0x4, 14),
+	CYGNUS_PIN_DESC(134, "lcd_cld14", 1, 0x4, 12),
+	CYGNUS_PIN_DESC(135, "lcd_cld15", 1, 0x4, 10),
+	CYGNUS_PIN_DESC(136, "lcd_cld16", 1, 0x4, 8),
+	CYGNUS_PIN_DESC(137, "lcd_cld17", 1, 0x4, 6),
+	CYGNUS_PIN_DESC(138, "lcd_cld18", 1, 0x4, 4),
+	CYGNUS_PIN_DESC(139, "lcd_cld19", 1, 0x4, 2),
+	CYGNUS_PIN_DESC(140, "lcd_cld2", 1, 0x8, 22),
+	CYGNUS_PIN_DESC(141, "lcd_cld20", 1, 0x8, 30),
+	CYGNUS_PIN_DESC(142, "lcd_cld21", 1, 0x8, 28),
+	CYGNUS_PIN_DESC(143, "lcd_cld22", 1, 0x8, 26),
+	CYGNUS_PIN_DESC(144, "lcd_cld23", 1, 0x8, 24),
+	CYGNUS_PIN_DESC(145, "lcd_cld3", 1, 0x8, 20),
+	CYGNUS_PIN_DESC(146, "lcd_cld4", 1, 0x8, 18),
+	CYGNUS_PIN_DESC(147, "lcd_cld5", 1, 0x8, 16),
+	CYGNUS_PIN_DESC(148, "lcd_cld6", 1, 0x8, 14),
+	CYGNUS_PIN_DESC(149, "lcd_cld7", 1, 0x8, 12),
+	CYGNUS_PIN_DESC(150, "lcd_cld8", 1, 0x8, 10),
+	CYGNUS_PIN_DESC(151, "lcd_cld9", 1, 0x8, 8),
+	CYGNUS_PIN_DESC(152, "lcd_clfp", 1, 0x8, 6),
+	CYGNUS_PIN_DESC(153, "lcd_clle", 1, 0x8, 4),
+	CYGNUS_PIN_DESC(154, "lcd_cllp", 1, 0x8, 2),
+	CYGNUS_PIN_DESC(155, "lcd_clpower", 1, 0x8, 0),
+	CYGNUS_PIN_DESC(156, "camera_vsync", 1, 0x4, 30),
+	CYGNUS_PIN_DESC(157, "camera_trigger", 1, 0x0, 0),
+	CYGNUS_PIN_DESC(158, "camera_strobe", 1, 0x0, 2),
+	CYGNUS_PIN_DESC(159, "camera_standby", 1, 0x0, 4),
+	CYGNUS_PIN_DESC(160, "camera_reset_n", 1, 0x0, 6),
+	CYGNUS_PIN_DESC(161, "camera_pixdata9", 1, 0x0, 8),
+	CYGNUS_PIN_DESC(162, "camera_pixdata8", 1, 0x0, 10),
+	CYGNUS_PIN_DESC(163, "camera_pixdata7", 1, 0x0, 12),
+	CYGNUS_PIN_DESC(164, "camera_pixdata6", 1, 0x0, 14),
+	CYGNUS_PIN_DESC(165, "camera_pixdata5", 1, 0x0, 16),
+	CYGNUS_PIN_DESC(166, "camera_pixdata4", 1, 0x0, 18),
+	CYGNUS_PIN_DESC(167, "camera_pixdata3", 1, 0x0, 20),
+	CYGNUS_PIN_DESC(168, "camera_pixdata2", 1, 0x0, 22),
+	CYGNUS_PIN_DESC(169, "camera_pixdata1", 1, 0x0, 24),
+	CYGNUS_PIN_DESC(170, "camera_pixdata0", 1, 0x0, 26),
+	CYGNUS_PIN_DESC(171, "camera_pixclk", 1, 0x0, 28),
+	CYGNUS_PIN_DESC(172, "camera_hsync", 1, 0x0, 30),
+	CYGNUS_PIN_DESC(173, "camera_pll_ref_clk", 0, 0, 0),
+	CYGNUS_PIN_DESC(174, "usb_id_indication", 0, 0, 0),
+	CYGNUS_PIN_DESC(175, "usb_vbus_indication", 0, 0, 0),
+	CYGNUS_PIN_DESC(176, "gpio0_3p3", 0, 0, 0),
+	CYGNUS_PIN_DESC(177, "gpio1_3p3", 0, 0, 0),
+	CYGNUS_PIN_DESC(178, "gpio2_3p3", 0, 0, 0),
+	CYGNUS_PIN_DESC(179, "gpio3_3p3", 0, 0, 0),
+};
+
+/*
+ * List of groups of pins
+ */
+static const unsigned bsc1_pins[] = { 8, 9 };
+static const unsigned pcie_clkreq_pins[] = { 8, 9 };
+
+static const unsigned i2s2_0_pins[] = { 12 };
+static const unsigned i2s2_1_pins[] = { 13 };
+static const unsigned i2s2_2_pins[] = { 14 };
+static const unsigned i2s2_3_pins[] = { 15 };
+static const unsigned i2s2_4_pins[] = { 16 };
+
+static const unsigned pwm4_pins[] = { 17 };
+static const unsigned pwm5_pins[] = { 18 };
+
+static const unsigned key0_pins[] = { 20 };
+static const unsigned key1_pins[] = { 21 };
+static const unsigned key2_pins[] = { 22 };
+static const unsigned key3_pins[] = { 23 };
+static const unsigned key4_pins[] = { 24 };
+static const unsigned key5_pins[] = { 25 };
+
+static const unsigned key6_pins[] = { 26 };
+static const unsigned audio_dte0_pins[] = { 26 };
+
+static const unsigned key7_pins[] = { 27 };
+static const unsigned audio_dte1_pins[] = { 27 };
+
+static const unsigned key8_pins[] = { 28 };
+static const unsigned key9_pins[] = { 29 };
+static const unsigned key10_pins[] = { 30 };
+static const unsigned key11_pins[] = { 31 };
+static const unsigned key12_pins[] = { 32 };
+static const unsigned key13_pins[] = { 33 };
+
+static const unsigned key14_pins[] = { 34 };
+static const unsigned audio_dte2_pins[] = { 34 };
+
+static const unsigned key15_pins[] = { 35 };
+static const unsigned audio_dte3_pins[] = { 35 };
+
+static const unsigned pwm0_pins[] = { 38 };
+static const unsigned pwm1_pins[] = { 39 };
+static const unsigned pwm2_pins[] = { 40 };
+static const unsigned pwm3_pins[] = { 41 };
+
+static const unsigned sdio0_pins[] = { 94, 95, 96, 97, 98, 99 };
+
+static const unsigned smart_card0_pins[] = { 42, 43, 44, 46, 47 };
+static const unsigned i2s0_0_pins[] = { 42, 43, 44, 46 };
+static const unsigned spdif_pins[] = { 47 };
+
+static const unsigned smart_card1_pins[] = { 48, 49, 50, 52, 53 };
+static const unsigned i2s1_0_pins[] = { 48, 49, 50, 52 };
+
+static const unsigned spi0_pins[] = { 54, 55, 56, 57 };
+
+static const unsigned spi1_pins[] = { 58, 59, 60, 61 };
+
+static const unsigned spi2_pins[] = { 62, 63, 64, 65 };
+
+static const unsigned spi3_pins[] = { 66, 67, 68, 69 };
+static const unsigned sw_led0_0_pins[] = { 66, 67, 68, 69 };
+
+static const unsigned d1w_pins[] = { 10, 11 };
+static const unsigned uart4_pins[] = { 10, 11 };
+static const unsigned sw_led2_0_pins[] = { 10, 11 };
+
+static const unsigned lcd_pins[] = { 126, 127, 128, 129, 130, 131, 132, 133,
+	134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147,
+	148, 149, 150, 151, 152, 153, 154, 155 };
+static const unsigned sram_0_pins[] = { 126, 127, 128, 129, 130, 131, 132, 133,
+	134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147,
+	148, 149, 150, 151, 152, 153, 154, 155 };
+static const unsigned spi5_pins[] = { 141, 142, 143, 144 };
+
+static const unsigned uart0_pins[] = { 70, 71, 72, 73 };
+static const unsigned sw_led0_1_pins[] = { 70, 71, 72, 73 };
+
+static const unsigned uart1_dte_pins[] = { 75, 76, 77, 78 };
+static const unsigned uart2_pins[] = { 75, 76, 77, 78 };
+
+static const unsigned uart1_pins[] = { 74, 79, 80, 81 };
+
+static const unsigned uart3_pins[] = { 82, 83 };
+
+static const unsigned qspi_0_pins[] = { 104, 105, 106, 107 };
+
+static const unsigned nand_pins[] = { 110, 111, 112, 113, 114, 115, 116, 117,
+	118, 119, 120, 121, 122, 123, 124, 125 };
+
+static const unsigned sdio0_cd_pins[] = { 103 };
+
+static const unsigned sdio0_mmc_pins[] = { 100, 101, 102 };
+
+static const unsigned sdio1_data_0_pins[] = { 86, 87 };
+static const unsigned can0_pins[] = { 86, 87 };
+static const unsigned spi4_0_pins[] = { 86, 87 };
+
+static const unsigned sdio1_data_1_pins[] = { 88, 89 };
+static const unsigned can1_pins[] = { 88, 89 };
+static const unsigned spi4_1_pins[] = { 88, 89 };
+
+static const unsigned sdio1_cd_pins[] = { 93 };
+
+static const unsigned sdio1_led_pins[] = { 84, 85 };
+static const unsigned sw_led2_1_pins[] = { 84, 85 };
+
+static const unsigned sdio1_mmc_pins[] = { 90, 91, 92 };
+
+static const unsigned cam_led_pins[] = { 156, 157, 158, 159, 160 };
+static const unsigned sw_led1_pins[] = { 156, 157, 158, 159 };
+
+static const unsigned cam_0_pins[] = { 169, 170, 171, 169, 170 };
+
+static const unsigned cam_1_pins[] = { 161, 162, 163, 164, 165, 166, 167,
+	168 };
+static const unsigned sram_1_pins[] = { 161, 162, 163, 164, 165, 166, 167,
+	168 };
+
+static const unsigned qspi_1_pins[] = { 108, 109 };
+
+static const unsigned smart_card0_fcb_pins[] = { 45 };
+static const unsigned i2s0_1_pins[] = { 45 };
+
+static const unsigned smart_card1_fcb_pins[] = { 51 };
+static const unsigned i2s1_1_pins[] = { 51 };
+
+static const unsigned gpio0_3p3_pins[] = { 176 };
+static const unsigned usb0_oc_pins[] = { 176 };
+
+static const unsigned gpio1_3p3_pins[] = { 177 };
+static const unsigned usb1_oc_pins[] = { 177 };
+
+static const unsigned gpio2_3p3_pins[] = { 178 };
+static const unsigned usb2_oc_pins[] = { 178 };
+
+#define CYGNUS_PIN_GROUP(group_name, off, sh, al)	\
+{							\
+	.name = __stringify(group_name) "_grp",		\
+	.pins = group_name ## _pins,			\
+	.num_pins = ARRAY_SIZE(group_name ## _pins),	\
+	.mux = {					\
+		.offset = off,				\
+		.shift = sh,				\
+		.alt = al,				\
+	}						\
+}
+
+/*
+ * List of Cygnus pin groups
+ */
+static const struct cygnus_pin_group cygnus_pin_groups[] = {
+	CYGNUS_PIN_GROUP(i2s2_0, 0x0, 0, 2),
+	CYGNUS_PIN_GROUP(i2s2_1, 0x0, 4, 2),
+	CYGNUS_PIN_GROUP(i2s2_2, 0x0, 8, 2),
+	CYGNUS_PIN_GROUP(i2s2_3, 0x0, 12, 2),
+	CYGNUS_PIN_GROUP(i2s2_4, 0x0, 16, 2),
+	CYGNUS_PIN_GROUP(pwm4, 0x0, 20, 0),
+	CYGNUS_PIN_GROUP(pwm5, 0x0, 24, 2),
+	CYGNUS_PIN_GROUP(key0, 0x4, 0, 1),
+	CYGNUS_PIN_GROUP(key1, 0x4, 4, 1),
+	CYGNUS_PIN_GROUP(key2, 0x4, 8, 1),
+	CYGNUS_PIN_GROUP(key3, 0x4, 12, 1),
+	CYGNUS_PIN_GROUP(key4, 0x4, 16, 1),
+	CYGNUS_PIN_GROUP(key5, 0x4, 20, 1),
+	CYGNUS_PIN_GROUP(key6, 0x4, 24, 1),
+	CYGNUS_PIN_GROUP(audio_dte0, 0x4, 24, 2),
+	CYGNUS_PIN_GROUP(key7, 0x4, 28, 1),
+	CYGNUS_PIN_GROUP(audio_dte1, 0x4, 28, 2),
+	CYGNUS_PIN_GROUP(key8, 0x8, 0, 1),
+	CYGNUS_PIN_GROUP(key9, 0x8, 4, 1),
+	CYGNUS_PIN_GROUP(key10, 0x8, 8, 1),
+	CYGNUS_PIN_GROUP(key11, 0x8, 12, 1),
+	CYGNUS_PIN_GROUP(key12, 0x8, 16, 1),
+	CYGNUS_PIN_GROUP(key13, 0x8, 20, 1),
+	CYGNUS_PIN_GROUP(key14, 0x8, 24, 1),
+	CYGNUS_PIN_GROUP(audio_dte2, 0x8, 24, 2),
+	CYGNUS_PIN_GROUP(key15, 0x8, 28, 1),
+	CYGNUS_PIN_GROUP(audio_dte3, 0x8, 28, 2),
+	CYGNUS_PIN_GROUP(pwm0, 0xc, 0, 0),
+	CYGNUS_PIN_GROUP(pwm1, 0xc, 4, 0),
+	CYGNUS_PIN_GROUP(pwm2, 0xc, 8, 0),
+	CYGNUS_PIN_GROUP(pwm3, 0xc, 12, 0),
+	CYGNUS_PIN_GROUP(sdio0, 0xc, 16, 0),
+	CYGNUS_PIN_GROUP(smart_card0, 0xc, 20, 0),
+	CYGNUS_PIN_GROUP(i2s0_0, 0xc, 20, 1),
+	CYGNUS_PIN_GROUP(spdif, 0xc, 20, 1),
+	CYGNUS_PIN_GROUP(smart_card1, 0xc, 24, 0),
+	CYGNUS_PIN_GROUP(i2s1_0, 0xc, 24, 1),
+	CYGNUS_PIN_GROUP(spi0, 0x10, 0, 0),
+	CYGNUS_PIN_GROUP(spi1, 0x10, 4, 0),
+	CYGNUS_PIN_GROUP(spi2, 0x10, 8, 0),
+	CYGNUS_PIN_GROUP(spi3, 0x10, 12, 0),
+	CYGNUS_PIN_GROUP(sw_led0_0, 0x10, 12, 2),
+	CYGNUS_PIN_GROUP(d1w, 0x10, 16, 0),
+	CYGNUS_PIN_GROUP(uart4, 0x10, 16, 1),
+	CYGNUS_PIN_GROUP(sw_led2_0, 0x10, 16, 2),
+	CYGNUS_PIN_GROUP(lcd, 0x10, 20, 0),
+	CYGNUS_PIN_GROUP(sram_0, 0x10, 20, 1),
+	CYGNUS_PIN_GROUP(spi5, 0x10, 20, 2),
+	CYGNUS_PIN_GROUP(uart0, 0x14, 0, 0),
+	CYGNUS_PIN_GROUP(sw_led0_1, 0x14, 0, 2),
+	CYGNUS_PIN_GROUP(uart1_dte, 0x14, 4, 0),
+	CYGNUS_PIN_GROUP(uart2, 0x14, 4, 1),
+	CYGNUS_PIN_GROUP(uart1, 0x14, 8, 0),
+	CYGNUS_PIN_GROUP(uart3, 0x14, 12, 0),
+	CYGNUS_PIN_GROUP(qspi_0, 0x14, 16, 0),
+	CYGNUS_PIN_GROUP(nand, 0x14, 20, 0),
+	CYGNUS_PIN_GROUP(sdio0_cd, 0x18, 0, 0),
+	CYGNUS_PIN_GROUP(sdio0_mmc, 0x18, 4, 0),
+	CYGNUS_PIN_GROUP(sdio1_data_0, 0x18, 8, 0),
+	CYGNUS_PIN_GROUP(can0, 0x18, 8, 1),
+	CYGNUS_PIN_GROUP(spi4_0, 0x18, 8, 2),
+	CYGNUS_PIN_GROUP(sdio1_data_1, 0x18, 12, 0),
+	CYGNUS_PIN_GROUP(can1, 0x18, 12, 1),
+	CYGNUS_PIN_GROUP(spi4_1, 0x18, 12, 2),
+	CYGNUS_PIN_GROUP(sdio1_cd, 0x18, 16, 0),
+	CYGNUS_PIN_GROUP(sdio1_led, 0x18, 20, 0),
+	CYGNUS_PIN_GROUP(sw_led2_1, 0x18, 20, 2),
+	CYGNUS_PIN_GROUP(sdio1_mmc, 0x18, 24, 0),
+	CYGNUS_PIN_GROUP(cam_led, 0x1c, 0, 0),
+	CYGNUS_PIN_GROUP(sw_led1, 0x1c, 0, 1),
+	CYGNUS_PIN_GROUP(cam_0, 0x1c, 4, 0),
+	CYGNUS_PIN_GROUP(cam_1, 0x1c, 8, 0),
+	CYGNUS_PIN_GROUP(sram_1, 0x1c, 8, 1),
+	CYGNUS_PIN_GROUP(qspi_1, 0x1c, 12, 0),
+	CYGNUS_PIN_GROUP(bsc1, 0x1c, 16, 0),
+	CYGNUS_PIN_GROUP(pcie_clkreq, 0x1c, 16, 1),
+	CYGNUS_PIN_GROUP(smart_card0_fcb, 0x20, 0, 0),
+	CYGNUS_PIN_GROUP(i2s0_1, 0x20, 0, 1),
+	CYGNUS_PIN_GROUP(smart_card1_fcb, 0x20, 4, 0),
+	CYGNUS_PIN_GROUP(i2s1_1, 0x20, 4, 1),
+	CYGNUS_PIN_GROUP(gpio0_3p3, 0x28, 0, 0),
+	CYGNUS_PIN_GROUP(usb0_oc, 0x28, 0, 1),
+	CYGNUS_PIN_GROUP(gpio1_3p3, 0x28, 4, 0),
+	CYGNUS_PIN_GROUP(usb1_oc, 0x28, 4, 1),
+	CYGNUS_PIN_GROUP(gpio2_3p3, 0x28, 8, 0),
+	CYGNUS_PIN_GROUP(usb2_oc, 0x28, 8, 1),
+};
+
+/*
+ * List of groups supported by functions
+ */
+static const char * const i2s0_grps[] = { "i2s0_0_grp", "i2s0_1_grp" };
+static const char * const i2s1_grps[] = { "i2s1_0_grp", "i2s1_1_grp" };
+static const char * const i2s2_grps[] = { "i2s2_0_grp", "i2s2_1_grp",
+	"i2s2_2_grp", "i2s2_3_grp", "i2s2_4_grp" };
+static const char * const spdif_grps[] = { "spdif_grp" };
+static const char * const pwm0_grps[] = { "pwm0_grp" };
+static const char * const pwm1_grps[] = { "pwm1_grp" };
+static const char * const pwm2_grps[] = { "pwm2_grp" };
+static const char * const pwm3_grps[] = { "pwm3_grp" };
+static const char * const pwm4_grps[] = { "pwm4_grp" };
+static const char * const pwm5_grps[] = { "pwm5_grp" };
+static const char * const key_grps[] = { "key0_grp", "key1_grp", "key2_grp",
+	"key3_grp", "key4_grp", "key5_grp", "key6_grp", "key7_grp", "key8_grp",
+	"key9_grp", "key10_grp", "key11_grp", "key12_grp", "key13_grp",
+	"key14_grp", "key15_grp" };
+static const char * const audio_dte_grps[] = { "audio_dte0_grp",
+	"audio_dte1_grp", "audio_dte2_grp", "audio_dte3_grp" };
+static const char * const smart_card0_grps[] = { "smart_card0_grp",
+	"smart_card0_fcb_grp" };
+static const char * const smart_card1_grps[] = { "smart_card1_grp",
+	"smart_card1_fcb_grp" };
+static const char * const spi0_grps[] = { "spi0_grp" };
+static const char * const spi1_grps[] = { "spi1_grp" };
+static const char * const spi2_grps[] = { "spi2_grp" };
+static const char * const spi3_grps[] = { "spi3_grp" };
+static const char * const spi4_grps[] = { "spi4_0_grp", "spi4_1_grp" };
+static const char * const spi5_grps[] = { "spi5_grp" };
+
+static const char * const sw_led0_grps[] = { "sw_led0_0_grp",
+	"sw_led0_1_grp" };
+static const char * const sw_led1_grps[] = { "sw_led1_grp" };
+static const char * const sw_led2_grps[] = { "sw_led2_0_grp",
+	"sw_led2_1_grp" };
+static const char * const d1w_grps[] = { "d1w_grp" };
+static const char * const lcd_grps[] = { "lcd_grp" };
+static const char * const sram_grps[] = { "sram_0_grp", "sram_1_grp" };
+
+static const char * const uart0_grps[] = { "uart0_grp" };
+static const char * const uart1_grps[] = { "uart1_grp", "uart1_dte_grp" };
+static const char * const uart2_grps[] = { "uart2_grp" };
+static const char * const uart3_grps[] = { "uart3_grp" };
+static const char * const uart4_grps[] = { "uart4_grp" };
+static const char * const qspi_grps[] = { "qspi_0_grp", "qspi_1_grp" };
+static const char * const nand_grps[] = { "nand_grp" };
+static const char * const sdio0_grps[] = { "sdio0_grp", "sdio0_cd_grp",
+	"sdio0_mmc_grp" };
+static const char * const sdio1_grps[] = { "sdio1_data_0_grp",
+	"sdio1_data_1_grp", "sdio1_cd_grp", "sdio1_led_grp", "sdio1_mmc_grp" };
+static const char * const can0_grps[] = { "can0_grp" };
+static const char * const can1_grps[] = { "can1_grp" };
+static const char * const cam_grps[] = { "cam_led_grp", "cam_0_grp",
+	"cam_1_grp" };
+static const char * const bsc1_grps[] = { "bsc1_grp" };
+static const char * const pcie_clkreq_grps[] = { "pcie_clkreq_grp" };
+static const char * const usb0_oc_grps[] = { "usb0_oc_grp" };
+static const char * const usb1_oc_grps[] = { "usb1_oc_grp" };
+static const char * const usb2_oc_grps[] = { "usb2_oc_grp" };
+
+#define CYGNUS_PIN_FUNCTION(func)				\
+{								\
+	.name = #func,						\
+	.groups = func ## _grps,				\
+	.num_groups = ARRAY_SIZE(func ## _grps),		\
+}
+
+/*
+ * List of supported functions in Cygnus
+ */
+static const struct cygnus_pin_function cygnus_pin_functions[] = {
+	CYGNUS_PIN_FUNCTION(i2s0),
+	CYGNUS_PIN_FUNCTION(i2s1),
+	CYGNUS_PIN_FUNCTION(i2s2),
+	CYGNUS_PIN_FUNCTION(spdif),
+	CYGNUS_PIN_FUNCTION(pwm0),
+	CYGNUS_PIN_FUNCTION(pwm1),
+	CYGNUS_PIN_FUNCTION(pwm2),
+	CYGNUS_PIN_FUNCTION(pwm3),
+	CYGNUS_PIN_FUNCTION(pwm4),
+	CYGNUS_PIN_FUNCTION(pwm5),
+	CYGNUS_PIN_FUNCTION(key),
+	CYGNUS_PIN_FUNCTION(audio_dte),
+	CYGNUS_PIN_FUNCTION(smart_card0),
+	CYGNUS_PIN_FUNCTION(smart_card1),
+	CYGNUS_PIN_FUNCTION(spi0),
+	CYGNUS_PIN_FUNCTION(spi1),
+	CYGNUS_PIN_FUNCTION(spi2),
+	CYGNUS_PIN_FUNCTION(spi3),
+	CYGNUS_PIN_FUNCTION(spi4),
+	CYGNUS_PIN_FUNCTION(spi5),
+	CYGNUS_PIN_FUNCTION(sw_led0),
+	CYGNUS_PIN_FUNCTION(sw_led1),
+	CYGNUS_PIN_FUNCTION(sw_led2),
+	CYGNUS_PIN_FUNCTION(d1w),
+	CYGNUS_PIN_FUNCTION(lcd),
+	CYGNUS_PIN_FUNCTION(sram),
+	CYGNUS_PIN_FUNCTION(uart0),
+	CYGNUS_PIN_FUNCTION(uart1),
+	CYGNUS_PIN_FUNCTION(uart2),
+	CYGNUS_PIN_FUNCTION(uart3),
+	CYGNUS_PIN_FUNCTION(uart4),
+	CYGNUS_PIN_FUNCTION(qspi),
+	CYGNUS_PIN_FUNCTION(nand),
+	CYGNUS_PIN_FUNCTION(sdio0),
+	CYGNUS_PIN_FUNCTION(sdio1),
+	CYGNUS_PIN_FUNCTION(can0),
+	CYGNUS_PIN_FUNCTION(can1),
+	CYGNUS_PIN_FUNCTION(cam),
+	CYGNUS_PIN_FUNCTION(bsc1),
+	CYGNUS_PIN_FUNCTION(pcie_clkreq),
+	CYGNUS_PIN_FUNCTION(usb0_oc),
+	CYGNUS_PIN_FUNCTION(usb1_oc),
+	CYGNUS_PIN_FUNCTION(usb2_oc),
+};
+
+static int cygnus_get_groups_count(struct pinctrl_dev *pctrl_dev)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->num_groups;
+}
+
+static const char *cygnus_get_group_name(struct pinctrl_dev *pctrl_dev,
+					 unsigned selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->groups[selector].name;
+}
+
+static int cygnus_get_group_pins(struct pinctrl_dev *pctrl_dev,
+				 unsigned selector, const unsigned **pins,
+				 unsigned *num_pins)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	*pins = pinctrl->groups[selector].pins;
+	*num_pins = pinctrl->groups[selector].num_pins;
+
+	return 0;
+}
+
+static void cygnus_pin_dbg_show(struct pinctrl_dev *pctrl_dev,
+				struct seq_file *s, unsigned offset)
+{
+	seq_printf(s, " %s", dev_name(pctrl_dev->dev));
+}
+
+static bool cygnus_function_is_valid(const char *function_name)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(cygnus_pin_functions); i++) {
+		if (!strcmp(cygnus_pin_functions[i].name, function_name))
+			return true;
+	}
+
+	return false;
+}
+
+/*
+ * TODO: Use API from pinctrl framework once "groups" parsing is supported
+ */
+static int cygnus_dt_node_to_map(struct pinctrl_dev *pctrl_dev,
+				 struct device_node *np,
+				 struct pinctrl_map **map,
+				 unsigned *num_maps)
+{
+	int ret, num_groups;
+	unsigned reserved_maps = 0;
+	struct property *prop;
+	const char *group_name, *function_name;
+
+	*map = NULL;
+	*num_maps = 0;
+
+	num_groups = of_property_count_strings(np, "groups");
+	if (num_groups < 0) {
+		dev_err(pctrl_dev->dev, "could not parse property groups\n");
+		return -EINVAL;
+	}
+
+	ret = of_property_read_string(np, "function", &function_name);
+	if (ret < 0) {
+		dev_err(pctrl_dev->dev,	"could not parse property function\n");
+		return -EINVAL;
+	}
+
+	/* check if it's a valid function */
+	if (!cygnus_function_is_valid(function_name)) {
+		dev_warn(pctrl_dev->dev, "invalid function name: %s\n",
+				function_name);
+	}
+
+	ret = pinctrl_utils_reserve_map(pctrl_dev, map, &reserved_maps,
+			num_maps, num_groups);
+	if (ret) {
+		dev_err(pctrl_dev->dev, "unable to reserve map\n");
+		return ret;
+	}
+
+	of_property_for_each_string(np, "groups", prop, group_name) {
+		ret = pinctrl_utils_add_map_mux(pctrl_dev, map,
+				&reserved_maps, num_maps, group_name,
+				function_name);
+		if (ret) {
+			dev_err(pctrl_dev->dev, "can't add map: %d\n", ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static const struct pinctrl_ops cygnus_pinctrl_ops = {
+	.get_groups_count = cygnus_get_groups_count,
+	.get_group_name = cygnus_get_group_name,
+	.get_group_pins = cygnus_get_group_pins,
+	.pin_dbg_show = cygnus_pin_dbg_show,
+	.dt_node_to_map = cygnus_dt_node_to_map,
+	.dt_free_map = pinctrl_utils_dt_free_map,
+};
+
+static int cygnus_get_functions_count(struct pinctrl_dev *pctrl_dev)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->num_functions;
+}
+
+static const char *cygnus_get_function_name(struct pinctrl_dev *pctrl_dev,
+					    unsigned selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->functions[selector].name;
+}
+
+static int cygnus_get_function_groups(struct pinctrl_dev *pctrl_dev,
+				      unsigned selector,
+				      const char * const **groups,
+				      unsigned * const num_groups)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	*groups = pinctrl->functions[selector].groups;
+	*num_groups = pinctrl->functions[selector].num_groups;
+
+	return 0;
+}
+
+static int cygnus_pinmux_set(struct cygnus_pinctrl *pinctrl,
+			     const struct cygnus_pin_function *func,
+			     const struct cygnus_pin_group *grp,
+			     struct cygnus_mux_log *mux_log)
+{
+	const struct cygnus_mux *mux = &grp->mux;
+	int i;
+	u32 val, mask = 0x7;
+	unsigned long flags;
+
+	for (i = 0; i < CYGNUS_NUM_IOMUX; i++) {
+		if (mux->offset != mux_log[i].mux.offset ||
+		    mux->shift != mux_log[i].mux.shift)
+			continue;
+
+		/* match found if we reach here */
+
+		/* if this is a new configuration, just do it! */
+		if (!mux_log[i].is_configured)
+			break;
+
+		/*
+		 * IOMUX has been configured previously and one is trying to
+		 * configure it to a different function
+		 */
+		if (mux_log[i].mux.alt != mux->alt) {
+			dev_err(pinctrl->dev,
+				"double configuration error detected!\n");
+			dev_err(pinctrl->dev, "func:%s grp:%s\n",
+				func->name, grp->name);
+			return -EINVAL;
+		} else {
+			/*
+			 * One tries to configure it to the same function.
+			 * Just quit and don't bother
+			 */
+			return 0;
+		}
+	}
+
+	mux_log[i].mux.alt = mux->alt;
+	mux_log[i].is_configured = true;
+
+	spin_lock_irqsave(&pinctrl->lock, flags);
+
+	val = readl(pinctrl->base0 + grp->mux.offset);
+	val &= ~(mask << grp->mux.shift);
+	val |= grp->mux.alt << grp->mux.shift;
+	writel(val, pinctrl->base0 + grp->mux.offset);
+
+	spin_unlock_irqrestore(&pinctrl->lock, flags);
+
+	return 0;
+}
+
+static int cygnus_pinmux_set_mux(struct pinctrl_dev *pctrl_dev,
+				 unsigned func_select, unsigned grp_select)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+	const struct cygnus_pin_function *func =
+		&pinctrl->functions[func_select];
+	const struct cygnus_pin_group *grp = &pinctrl->groups[grp_select];
+
+	dev_dbg(pctrl_dev->dev, "func:%u name:%s grp:%u name:%s\n",
+		func_select, func->name, grp_select, grp->name);
+
+	dev_dbg(pctrl_dev->dev, "offset:0x%08x shift:%u alt:%u\n",
+		grp->mux.offset, grp->mux.shift, grp->mux.alt);
+
+	return cygnus_pinmux_set(pinctrl, func, grp, pinctrl->mux_log);
+}
+
+static int cygnus_gpio_request_enable(struct pinctrl_dev *pctrl_dev,
+				      struct pinctrl_gpio_range *range,
+				      unsigned pin)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+	const struct cygnus_gpio_mux *mux = pctrl_dev->desc->pins[pin].drv_data;
+	u32 val;
+	unsigned long flags;
+
+	/* not all pins support GPIO pinmux override */
+	if (!mux->is_supported)
+		return -ENOTSUPP;
+
+	spin_lock_irqsave(&pinctrl->lock, flags);
+
+	val = readl(pinctrl->base1 + mux->offset);
+	val |= 0x3 << mux->shift;
+	writel(val, pinctrl->base1 + mux->offset);
+
+	spin_unlock_irqrestore(&pinctrl->lock, flags);
+
+	dev_dbg(pctrl_dev->dev,
+		"gpio request enable pin=%u offset=0x%x shift=%u\n",
+		pin, mux->offset, mux->shift);
+
+	return 0;
+}
+
+static void cygnus_gpio_disable_free(struct pinctrl_dev *pctrl_dev,
+				     struct pinctrl_gpio_range *range,
+				     unsigned pin)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+	struct cygnus_gpio_mux *mux = pctrl_dev->desc->pins[pin].drv_data;
+	u32 val;
+	unsigned long flags;
+
+	if (!mux->is_supported)
+		return;
+
+	spin_lock_irqsave(&pinctrl->lock, flags);
+
+	val = readl(pinctrl->base1 + mux->offset);
+	val &= ~(0x3 << mux->shift);
+	writel(val, pinctrl->base1 + mux->offset);
+
+	spin_unlock_irqrestore(&pinctrl->lock, flags);
+
+	dev_err(pctrl_dev->dev,
+		"gpio disable free pin=%u offset=0x%x shift=%u\n",
+		pin, mux->offset, mux->shift);
+}
+
+static const struct pinmux_ops cygnus_pinmux_ops = {
+	.get_functions_count = cygnus_get_functions_count,
+	.get_function_name = cygnus_get_function_name,
+	.get_function_groups = cygnus_get_function_groups,
+	.set_mux = cygnus_pinmux_set_mux,
+	.gpio_request_enable = cygnus_gpio_request_enable,
+	.gpio_disable_free = cygnus_gpio_disable_free,
+};
+
+static struct pinctrl_desc cygnus_pinctrl_desc = {
+	.name = "cygnus-pinmux",
+	.pctlops = &cygnus_pinctrl_ops,
+	.pmxops = &cygnus_pinmux_ops,
+};
+
+static int cygnus_mux_log_init(struct cygnus_pinctrl *pinctrl)
+{
+	struct cygnus_mux_log *log;
+	unsigned int i, j;
+
+	pinctrl->mux_log = devm_kcalloc(pinctrl->dev, CYGNUS_NUM_IOMUX,
+					sizeof(struct cygnus_mux_log),
+					GFP_KERNEL);
+	if (!pinctrl->mux_log)
+		return -ENOMEM;
+
+	log = pinctrl->mux_log;
+	for (i = 0; i < CYGNUS_NUM_IOMUX_REGS; i++) {
+		for (j = 0; j < CYGNUS_NUM_MUX_PER_REG; j++) {
+			log = &pinctrl->mux_log[i * CYGNUS_NUM_MUX_PER_REG
+				+ j];
+			log->mux.offset = i * 4;
+			log->mux.shift = j * 4;
+			log->mux.alt = 0;
+			log->is_configured = false;
+		}
+	}
+
+	return 0;
+}
+
+static int cygnus_pinmux_probe(struct platform_device *pdev)
+{
+	struct cygnus_pinctrl *pinctrl;
+	struct resource *res;
+	int i, ret;
+	struct pinctrl_pin_desc *pins;
+	unsigned num_pins = ARRAY_SIZE(cygnus_pins);
+
+	pinctrl = devm_kzalloc(&pdev->dev, sizeof(*pinctrl), GFP_KERNEL);
+	if (!pinctrl)
+		return -ENOMEM;
+
+	pinctrl->dev = &pdev->dev;
+	platform_set_drvdata(pdev, pinctrl);
+	spin_lock_init(&pinctrl->lock);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	pinctrl->base0 = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(pinctrl->base0)) {
+		dev_err(&pdev->dev, "unable to map I/O space\n");
+		return PTR_ERR(pinctrl->base0);
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	pinctrl->base1 = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(pinctrl->base1)) {
+		dev_err(&pdev->dev, "unable to map I/O space\n");
+		return PTR_ERR(pinctrl->base1);
+	}
+
+	ret = cygnus_mux_log_init(pinctrl);
+	if (ret) {
+		dev_err(&pdev->dev, "unable to initialize IOMUX log\n");
+		return ret;
+	}
+
+	pins = devm_kcalloc(&pdev->dev, num_pins, sizeof(*pins), GFP_KERNEL);
+	if (!pins)
+		return -ENOMEM;
+
+	for (i = 0; i < num_pins; i++) {
+		pins[i].number = cygnus_pins[i].pin;
+		pins[i].name = cygnus_pins[i].name;
+		pins[i].drv_data = &cygnus_pins[i].gpio_mux;
+	}
+
+	pinctrl->groups = cygnus_pin_groups;
+	pinctrl->num_groups = ARRAY_SIZE(cygnus_pin_groups);
+	pinctrl->functions = cygnus_pin_functions;
+	pinctrl->num_functions = ARRAY_SIZE(cygnus_pin_functions);
+	cygnus_pinctrl_desc.pins = pins;
+	cygnus_pinctrl_desc.npins = num_pins;
+
+	pinctrl->pctl = pinctrl_register(&cygnus_pinctrl_desc, &pdev->dev,
+			pinctrl);
+	if (!pinctrl->pctl) {
+		dev_err(&pdev->dev, "unable to register Cygnus IOMUX pinctrl\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static struct of_device_id cygnus_pinmux_of_match[] = {
+	{ .compatible = "brcm,cygnus-pinmux" },
+	{ }
+};
+
+static struct platform_driver cygnus_pinmux_driver = {
+	.driver = {
+		.name = "cygnus-pinmux",
+		.of_match_table = cygnus_pinmux_of_match,
+		.suppress_bind_attrs = true,
+	},
+	.probe = cygnus_pinmux_probe,
+};
+
+static int __init cygnus_pinmux_init(void)
+{
+	return platform_driver_register(&cygnus_pinmux_driver);
+}
+arch_initcall(cygnus_pinmux_init);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus IOMUX driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v4 3/4] pinctrl: cygnus: add initial IOMUX driver support

[Ray Jui]

This adds the initial driver support for the Broadcom Cygnus IOMUX
controller. The Cygnus IOMUX controller supports group based mux
configuration but allows certain pins to be muxed to GPIO individually

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/pinctrl/bcm/Kconfig              |   13 +
 drivers/pinctrl/bcm/Makefile             |    5 +-
 drivers/pinctrl/bcm/pinctrl-cygnus-mux.c | 1088 ++++++++++++++++++++++++++++++
 3 files changed, 1104 insertions(+), 2 deletions(-)
 create mode 100644 drivers/pinctrl/bcm/pinctrl-cygnus-mux.c

diff --git a/drivers/pinctrl/bcm/Kconfig b/drivers/pinctrl/bcm/Kconfig
index bc6d048..eb13201 100644
--- a/drivers/pinctrl/bcm/Kconfig
+++ b/drivers/pinctrl/bcm/Kconfig
@@ -19,3 +19,16 @@ config PINCTRL_BCM2835
 	bool
 	select PINMUX
 	select PINCONF
+
+config PINCTRL_CYGNUS_MUX
+	bool "Broadcom Cygnus IOMUX driver"
+	depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
+	select PINMUX
+	select GENERIC_PINCONF
+	default ARCH_BCM_CYGNUS
+	help
+	  Say yes here to enable the Broadcom Cygnus IOMUX driver.
+
+	  The Broadcom Cygnus IOMUX driver supports group based IOMUX
+	  configuration, with the exception that certain individual pins
+	  can be overrided to GPIO function
diff --git a/drivers/pinctrl/bcm/Makefile b/drivers/pinctrl/bcm/Makefile
index 7ba80a3..bb6beb6 100644
--- a/drivers/pinctrl/bcm/Makefile
+++ b/drivers/pinctrl/bcm/Makefile
@@ -1,4 +1,5 @@
 # Broadcom pinctrl support
 
-obj-$(CONFIG_PINCTRL_BCM281XX)	+= pinctrl-bcm281xx.o
-obj-$(CONFIG_PINCTRL_BCM2835)	+= pinctrl-bcm2835.o
+obj-$(CONFIG_PINCTRL_BCM281XX)		+= pinctrl-bcm281xx.o
+obj-$(CONFIG_PINCTRL_BCM2835)		+= pinctrl-bcm2835.o
+obj-$(CONFIG_PINCTRL_CYGNUS_MUX)	+= pinctrl-cygnus-mux.o
diff --git a/drivers/pinctrl/bcm/pinctrl-cygnus-mux.c b/drivers/pinctrl/bcm/pinctrl-cygnus-mux.c
new file mode 100644
index 0000000..c4c4ed2
--- /dev/null
+++ b/drivers/pinctrl/bcm/pinctrl-cygnus-mux.c
@@ -0,0 +1,1088 @@
+/* Copyright (C) 2014-2015 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * This file contains the Cygnus IOMUX driver that supports group based PINMUX
+ * configuration. Although PINMUX configuration is mainly group based, the
+ * Cygnus IOMUX controller allows certain pins to be individually muxed to GPIO
+ * function, and therefore be controlled by the Cygnus ASIU GPIO controller
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include "../core.h"
+#include "../pinctrl-utils.h"
+
+#define CYGNUS_NUM_IOMUX_REGS     8
+#define CYGNUS_NUM_MUX_PER_REG    8
+#define CYGNUS_NUM_IOMUX          (CYGNUS_NUM_IOMUX_REGS * \
+				   CYGNUS_NUM_MUX_PER_REG)
+
+/*
+ * Cygnus IOMUX register description
+ *
+ * @offset: register offset for mux configuration of a group
+ * @shift: bit shift for mux configuration of a group
+ * @alt: alternate function to set to
+ */
+struct cygnus_mux {
+	unsigned int offset;
+	unsigned int shift;
+	unsigned int alt;
+};
+
+/*
+ * Keep track of Cygnus IOMUX configuration and prevent double configuration
+ *
+ * @cygnus_mux: Cygnus IOMUX register description
+ * @is_configured: flag to indicate whether a mux setting has already been
+ * configured
+ */
+struct cygnus_mux_log {
+	struct cygnus_mux mux;
+	bool is_configured;
+};
+
+/*
+ * Group based IOMUX configuration
+ *
+ * @name: name of the group
+ * @pins: array of pins used by this group
+ * @num_pins: total number of pins used by this group
+ * @mux: Cygnus group based IOMUX configuration
+ */
+struct cygnus_pin_group {
+	const char *name;
+	const unsigned *pins;
+	unsigned num_pins;
+	struct cygnus_mux mux;
+};
+
+/*
+ * Cygnus mux function and supported pin groups
+ *
+ * @name: name of the function
+ * @groups: array of groups that can be supported by this function
+ * @num_groups: total number of groups that can be supported by this function
+ */
+struct cygnus_pin_function {
+	const char *name;
+	const char * const *groups;
+	unsigned num_groups;
+};
+
+/*
+ * Cygnus IOMUX pinctrl core
+ *
+ * @pctl: pointer to pinctrl_dev
+ * @dev: pointer to device
+ * @base0: first I/O register base of the Cygnus IOMUX controller
+ * @base1: second I/O register base
+ * @groups: pointer to array of groups
+ * @num_groups: total number of groups
+ * @functions: pointer to array of functions
+ * @num_functions: total number of functions
+ * @mux_log: pointer to the array of mux logs
+ * @lock: lock to protect register access
+ */
+struct cygnus_pinctrl {
+	struct pinctrl_dev *pctl;
+	struct device *dev;
+	void __iomem *base0;
+	void __iomem *base1;
+
+	const struct cygnus_pin_group *groups;
+	unsigned num_groups;
+
+	const struct cygnus_pin_function *functions;
+	unsigned num_functions;
+
+	struct cygnus_mux_log *mux_log;
+
+	spinlock_t lock;
+};
+
+/*
+ * Certain pins can be individually muxed to GPIO function
+ *
+ * @is_supported: flag to indicate GPIO mux is supported for this pin
+ * @offset: register offset for GPIO mux override of a pin
+ * @shift: bit shift for GPIO mux override of a pin
+ */
+struct cygnus_gpio_mux {
+	int is_supported;
+	unsigned int offset;
+	unsigned int shift;
+};
+
+/*
+ * Description of a pin in Cygnus
+ *
+ * @pin: pin number
+ * @name: pin name
+ * @gpio_mux: GPIO override related information
+ */
+struct cygnus_pin {
+	unsigned pin;
+	char *name;
+	struct cygnus_gpio_mux gpio_mux;
+};
+
+#define CYGNUS_PIN_DESC(p, n, i, o, s)	\
+{					\
+	.pin = p,			\
+	.name = n,			\
+	.gpio_mux = {			\
+		.is_supported = i,	\
+		.offset = o,		\
+		.shift = s,		\
+	},				\
+}
+
+/*
+ * List of pins in Cygnus
+ */
+static struct cygnus_pin cygnus_pins[] = {
+	CYGNUS_PIN_DESC(0, "ext_device_reset_n", 0, 0, 0),
+	CYGNUS_PIN_DESC(1, "chip_mode0", 0, 0, 0),
+	CYGNUS_PIN_DESC(2, "chip_mode1", 0, 0, 0),
+	CYGNUS_PIN_DESC(3, "chip_mode2", 0, 0, 0),
+	CYGNUS_PIN_DESC(4, "chip_mode3", 0, 0, 0),
+	CYGNUS_PIN_DESC(5, "chip_mode4", 0, 0, 0),
+	CYGNUS_PIN_DESC(6, "bsc0_scl", 0, 0, 0),
+	CYGNUS_PIN_DESC(7, "bsc0_sda", 0, 0, 0),
+	CYGNUS_PIN_DESC(8, "bsc1_scl", 0, 0, 0),
+	CYGNUS_PIN_DESC(9, "bsc1_sda", 0, 0, 0),
+	CYGNUS_PIN_DESC(10, "d1w_dq", 1, 0x28, 0),
+	CYGNUS_PIN_DESC(11, "d1wowstz_l", 1, 0x4, 28),
+	CYGNUS_PIN_DESC(12, "gpio0", 0, 0, 0),
+	CYGNUS_PIN_DESC(13, "gpio1", 0, 0, 0),
+	CYGNUS_PIN_DESC(14, "gpio2", 0, 0, 0),
+	CYGNUS_PIN_DESC(15, "gpio3", 0, 0, 0),
+	CYGNUS_PIN_DESC(16, "gpio4", 0, 0, 0),
+	CYGNUS_PIN_DESC(17, "gpio5", 0, 0, 0),
+	CYGNUS_PIN_DESC(18, "gpio6", 0, 0, 0),
+	CYGNUS_PIN_DESC(19, "gpio7", 0, 0, 0),
+	CYGNUS_PIN_DESC(20, "gpio8", 0, 0, 0),
+	CYGNUS_PIN_DESC(21, "gpio9", 0, 0, 0),
+	CYGNUS_PIN_DESC(22, "gpio10", 0, 0, 0),
+	CYGNUS_PIN_DESC(23, "gpio11", 0, 0, 0),
+	CYGNUS_PIN_DESC(24, "gpio12", 0, 0, 0),
+	CYGNUS_PIN_DESC(25, "gpio13", 0, 0, 0),
+	CYGNUS_PIN_DESC(26, "gpio14", 0, 0, 0),
+	CYGNUS_PIN_DESC(27, "gpio15", 0, 0, 0),
+	CYGNUS_PIN_DESC(28, "gpio16", 0, 0, 0),
+	CYGNUS_PIN_DESC(29, "gpio17", 0, 0, 0),
+	CYGNUS_PIN_DESC(30, "gpio18", 0, 0, 0),
+	CYGNUS_PIN_DESC(31, "gpio19", 0, 0, 0),
+	CYGNUS_PIN_DESC(32, "gpio20", 0, 0, 0),
+	CYGNUS_PIN_DESC(33, "gpio21", 0, 0, 0),
+	CYGNUS_PIN_DESC(34, "gpio22", 0, 0, 0),
+	CYGNUS_PIN_DESC(35, "gpio23", 0, 0, 0),
+	CYGNUS_PIN_DESC(36, "mdc", 0, 0, 0),
+	CYGNUS_PIN_DESC(37, "mdio", 0, 0, 0),
+	CYGNUS_PIN_DESC(38, "pwm0", 1, 0x10, 30),
+	CYGNUS_PIN_DESC(39, "pwm1", 1, 0x10, 28),
+	CYGNUS_PIN_DESC(40, "pwm2", 1, 0x10, 26),
+	CYGNUS_PIN_DESC(41, "pwm3", 1, 0x10, 24),
+	CYGNUS_PIN_DESC(42, "sc0_clk", 1, 0x10, 22),
+	CYGNUS_PIN_DESC(43, "sc0_cmdvcc_l", 1, 0x10, 20),
+	CYGNUS_PIN_DESC(44, "sc0_detect", 1, 0x10, 18),
+	CYGNUS_PIN_DESC(45, "sc0_fcb", 1, 0x10, 16),
+	CYGNUS_PIN_DESC(46, "sc0_io", 1, 0x10, 14),
+	CYGNUS_PIN_DESC(47, "sc0_rst_l", 1, 0x10, 12),
+	CYGNUS_PIN_DESC(48, "sc1_clk", 1, 0x10, 10),
+	CYGNUS_PIN_DESC(49, "sc1_cmdvcc_l", 1, 0x10, 8),
+	CYGNUS_PIN_DESC(50, "sc1_detect", 1, 0x10, 6),
+	CYGNUS_PIN_DESC(51, "sc1_fcb", 1, 0x10, 4),
+	CYGNUS_PIN_DESC(52, "sc1_io", 1, 0x10, 2),
+	CYGNUS_PIN_DESC(53, "sc1_rst_l", 1, 0x10, 0),
+	CYGNUS_PIN_DESC(54, "spi0_clk", 1, 0x18, 10),
+	CYGNUS_PIN_DESC(55, "spi0_mosi", 1, 0x18, 6),
+	CYGNUS_PIN_DESC(56, "spi0_miso", 1, 0x18, 8),
+	CYGNUS_PIN_DESC(57, "spi0_ss", 1, 0x18, 4),
+	CYGNUS_PIN_DESC(58, "spi1_clk", 1, 0x18, 2),
+	CYGNUS_PIN_DESC(59, "spi1_mosi", 1, 0x1c, 30),
+	CYGNUS_PIN_DESC(60, "spi1_miso", 1, 0x18, 0),
+	CYGNUS_PIN_DESC(61, "spi1_ss", 1, 0x1c, 28),
+	CYGNUS_PIN_DESC(62, "spi2_clk", 1, 0x1c, 26),
+	CYGNUS_PIN_DESC(63, "spi2_mosi", 1, 0x1c, 22),
+	CYGNUS_PIN_DESC(64, "spi2_miso", 1, 0x1c, 24),
+	CYGNUS_PIN_DESC(65, "spi2_ss", 1, 0x1c, 20),
+	CYGNUS_PIN_DESC(66, "spi3_clk", 1, 0x1c, 18),
+	CYGNUS_PIN_DESC(67, "spi3_mosi", 1, 0x1c, 14),
+	CYGNUS_PIN_DESC(68, "spi3_miso", 1, 0x1c, 16),
+	CYGNUS_PIN_DESC(69, "spi3_ss", 1, 0x1c, 12),
+	CYGNUS_PIN_DESC(70, "uart0_cts", 1, 0x1c, 10),
+	CYGNUS_PIN_DESC(71, "uart0_rts", 1, 0x1c, 8),
+	CYGNUS_PIN_DESC(72, "uart0_rx", 1, 0x1c, 6),
+	CYGNUS_PIN_DESC(73, "uart0_tx", 1, 0x1c, 4),
+	CYGNUS_PIN_DESC(74, "uart1_cts", 1, 0x1c, 2),
+	CYGNUS_PIN_DESC(75, "uart1_dcd", 1, 0x1c, 0),
+	CYGNUS_PIN_DESC(76, "uart1_dsr", 1, 0x20, 14),
+	CYGNUS_PIN_DESC(77, "uart1_dtr", 1, 0x20, 12),
+	CYGNUS_PIN_DESC(78, "uart1_ri", 1, 0x20, 10),
+	CYGNUS_PIN_DESC(79, "uart1_rts", 1, 0x20, 8),
+	CYGNUS_PIN_DESC(80, "uart1_rx", 1, 0x20, 6),
+	CYGNUS_PIN_DESC(81, "uart1_tx", 1, 0x20, 4),
+	CYGNUS_PIN_DESC(82, "uart3_rx", 1, 0x20, 2),
+	CYGNUS_PIN_DESC(83, "uart3_tx", 1, 0x20, 0),
+	CYGNUS_PIN_DESC(84, "sdio1_clk_sdcard", 1, 0x14, 6),
+	CYGNUS_PIN_DESC(85, "sdio1_cmd", 1, 0x14, 4),
+	CYGNUS_PIN_DESC(86, "sdio1_data0", 1, 0x14, 2),
+	CYGNUS_PIN_DESC(87, "sdio1_data1", 1, 0x14, 0),
+	CYGNUS_PIN_DESC(88, "sdio1_data2", 1, 0x18, 30),
+	CYGNUS_PIN_DESC(89, "sdio1_data3", 1, 0x18, 28),
+	CYGNUS_PIN_DESC(90, "sdio1_wp_n", 1, 0x18, 24),
+	CYGNUS_PIN_DESC(91, "sdio1_card_rst", 1, 0x14, 10),
+	CYGNUS_PIN_DESC(92, "sdio1_led_on", 1, 0x18, 26),
+	CYGNUS_PIN_DESC(93, "sdio1_cd", 1, 0x14, 8),
+	CYGNUS_PIN_DESC(94, "sdio0_clk_sdcard", 1, 0x14, 26),
+	CYGNUS_PIN_DESC(95, "sdio0_cmd", 1, 0x14, 24),
+	CYGNUS_PIN_DESC(96, "sdio0_data0", 1, 0x14, 22),
+	CYGNUS_PIN_DESC(97, "sdio0_data1", 1, 0x14, 20),
+	CYGNUS_PIN_DESC(98, "sdio0_data2", 1, 0x14, 18),
+	CYGNUS_PIN_DESC(99, "sdio0_data3", 1, 0x14, 16),
+	CYGNUS_PIN_DESC(100, "sdio0_wp_n", 1, 0x14, 12),
+	CYGNUS_PIN_DESC(101, "sdio0_card_rst", 1, 0x14, 30),
+	CYGNUS_PIN_DESC(102, "sdio0_led_on", 1, 0x14, 14),
+	CYGNUS_PIN_DESC(103, "sdio0_cd", 1, 0x14, 28),
+	CYGNUS_PIN_DESC(104, "sflash_clk", 1, 0x18, 22),
+	CYGNUS_PIN_DESC(105, "sflash_cs_l", 1, 0x18, 20),
+	CYGNUS_PIN_DESC(106, "sflash_mosi", 1, 0x18, 14),
+	CYGNUS_PIN_DESC(107, "sflash_miso", 1, 0x18, 16),
+	CYGNUS_PIN_DESC(108, "sflash_wp_n", 1, 0x18, 12),
+	CYGNUS_PIN_DESC(109, "sflash_hold_n", 1, 0x18, 18),
+	CYGNUS_PIN_DESC(110, "nand_ale", 1, 0xc, 30),
+	CYGNUS_PIN_DESC(111, "nand_ce0_l", 1, 0xc, 28),
+	CYGNUS_PIN_DESC(112, "nand_ce1_l", 1, 0xc, 26),
+	CYGNUS_PIN_DESC(113, "nand_cle", 1, 0xc, 24),
+	CYGNUS_PIN_DESC(114, "nand_dq0", 1, 0xc, 22),
+	CYGNUS_PIN_DESC(115, "nand_dq1", 1, 0xc, 20),
+	CYGNUS_PIN_DESC(116, "nand_dq2", 1, 0xc, 18),
+	CYGNUS_PIN_DESC(117, "nand_dq3", 1, 0xc, 16),
+	CYGNUS_PIN_DESC(118, "nand_dq4", 1, 0xc, 14),
+	CYGNUS_PIN_DESC(119, "nand_dq5", 1, 0xc, 12),
+	CYGNUS_PIN_DESC(120, "nand_dq6", 1, 0xc, 10),
+	CYGNUS_PIN_DESC(121, "nand_dq7", 1, 0xc, 8),
+	CYGNUS_PIN_DESC(122, "nand_rb_l", 1, 0xc, 6),
+	CYGNUS_PIN_DESC(123, "nand_re_l", 1, 0xc, 4),
+	CYGNUS_PIN_DESC(124, "nand_we_l", 1, 0xc, 2),
+	CYGNUS_PIN_DESC(125, "nand_wp_l", 1, 0xc, 0),
+	CYGNUS_PIN_DESC(126, "lcd_clac", 1, 0x4, 26),
+	CYGNUS_PIN_DESC(127, "lcd_clcp", 1, 0x4, 24),
+	CYGNUS_PIN_DESC(128, "lcd_cld0", 1, 0x4, 22),
+	CYGNUS_PIN_DESC(129, "lcd_cld1", 1, 0x4, 0),
+	CYGNUS_PIN_DESC(130, "lcd_cld10", 1, 0x4, 20),
+	CYGNUS_PIN_DESC(131, "lcd_cld11", 1, 0x4, 18),
+	CYGNUS_PIN_DESC(132, "lcd_cld12", 1, 0x4, 16),
+	CYGNUS_PIN_DESC(133, "lcd_cld13", 1, 0x4, 14),
+	CYGNUS_PIN_DESC(134, "lcd_cld14", 1, 0x4, 12),
+	CYGNUS_PIN_DESC(135, "lcd_cld15", 1, 0x4, 10),
+	CYGNUS_PIN_DESC(136, "lcd_cld16", 1, 0x4, 8),
+	CYGNUS_PIN_DESC(137, "lcd_cld17", 1, 0x4, 6),
+	CYGNUS_PIN_DESC(138, "lcd_cld18", 1, 0x4, 4),
+	CYGNUS_PIN_DESC(139, "lcd_cld19", 1, 0x4, 2),
+	CYGNUS_PIN_DESC(140, "lcd_cld2", 1, 0x8, 22),
+	CYGNUS_PIN_DESC(141, "lcd_cld20", 1, 0x8, 30),
+	CYGNUS_PIN_DESC(142, "lcd_cld21", 1, 0x8, 28),
+	CYGNUS_PIN_DESC(143, "lcd_cld22", 1, 0x8, 26),
+	CYGNUS_PIN_DESC(144, "lcd_cld23", 1, 0x8, 24),
+	CYGNUS_PIN_DESC(145, "lcd_cld3", 1, 0x8, 20),
+	CYGNUS_PIN_DESC(146, "lcd_cld4", 1, 0x8, 18),
+	CYGNUS_PIN_DESC(147, "lcd_cld5", 1, 0x8, 16),
+	CYGNUS_PIN_DESC(148, "lcd_cld6", 1, 0x8, 14),
+	CYGNUS_PIN_DESC(149, "lcd_cld7", 1, 0x8, 12),
+	CYGNUS_PIN_DESC(150, "lcd_cld8", 1, 0x8, 10),
+	CYGNUS_PIN_DESC(151, "lcd_cld9", 1, 0x8, 8),
+	CYGNUS_PIN_DESC(152, "lcd_clfp", 1, 0x8, 6),
+	CYGNUS_PIN_DESC(153, "lcd_clle", 1, 0x8, 4),
+	CYGNUS_PIN_DESC(154, "lcd_cllp", 1, 0x8, 2),
+	CYGNUS_PIN_DESC(155, "lcd_clpower", 1, 0x8, 0),
+	CYGNUS_PIN_DESC(156, "camera_vsync", 1, 0x4, 30),
+	CYGNUS_PIN_DESC(157, "camera_trigger", 1, 0x0, 0),
+	CYGNUS_PIN_DESC(158, "camera_strobe", 1, 0x0, 2),
+	CYGNUS_PIN_DESC(159, "camera_standby", 1, 0x0, 4),
+	CYGNUS_PIN_DESC(160, "camera_reset_n", 1, 0x0, 6),
+	CYGNUS_PIN_DESC(161, "camera_pixdata9", 1, 0x0, 8),
+	CYGNUS_PIN_DESC(162, "camera_pixdata8", 1, 0x0, 10),
+	CYGNUS_PIN_DESC(163, "camera_pixdata7", 1, 0x0, 12),
+	CYGNUS_PIN_DESC(164, "camera_pixdata6", 1, 0x0, 14),
+	CYGNUS_PIN_DESC(165, "camera_pixdata5", 1, 0x0, 16),
+	CYGNUS_PIN_DESC(166, "camera_pixdata4", 1, 0x0, 18),
+	CYGNUS_PIN_DESC(167, "camera_pixdata3", 1, 0x0, 20),
+	CYGNUS_PIN_DESC(168, "camera_pixdata2", 1, 0x0, 22),
+	CYGNUS_PIN_DESC(169, "camera_pixdata1", 1, 0x0, 24),
+	CYGNUS_PIN_DESC(170, "camera_pixdata0", 1, 0x0, 26),
+	CYGNUS_PIN_DESC(171, "camera_pixclk", 1, 0x0, 28),
+	CYGNUS_PIN_DESC(172, "camera_hsync", 1, 0x0, 30),
+	CYGNUS_PIN_DESC(173, "camera_pll_ref_clk", 0, 0, 0),
+	CYGNUS_PIN_DESC(174, "usb_id_indication", 0, 0, 0),
+	CYGNUS_PIN_DESC(175, "usb_vbus_indication", 0, 0, 0),
+	CYGNUS_PIN_DESC(176, "gpio0_3p3", 0, 0, 0),
+	CYGNUS_PIN_DESC(177, "gpio1_3p3", 0, 0, 0),
+	CYGNUS_PIN_DESC(178, "gpio2_3p3", 0, 0, 0),
+	CYGNUS_PIN_DESC(179, "gpio3_3p3", 0, 0, 0),
+};
+
+/*
+ * List of groups of pins
+ */
+static const unsigned bsc1_pins[] = { 8, 9 };
+static const unsigned pcie_clkreq_pins[] = { 8, 9 };
+
+static const unsigned i2s2_0_pins[] = { 12 };
+static const unsigned i2s2_1_pins[] = { 13 };
+static const unsigned i2s2_2_pins[] = { 14 };
+static const unsigned i2s2_3_pins[] = { 15 };
+static const unsigned i2s2_4_pins[] = { 16 };
+
+static const unsigned pwm4_pins[] = { 17 };
+static const unsigned pwm5_pins[] = { 18 };
+
+static const unsigned key0_pins[] = { 20 };
+static const unsigned key1_pins[] = { 21 };
+static const unsigned key2_pins[] = { 22 };
+static const unsigned key3_pins[] = { 23 };
+static const unsigned key4_pins[] = { 24 };
+static const unsigned key5_pins[] = { 25 };
+
+static const unsigned key6_pins[] = { 26 };
+static const unsigned audio_dte0_pins[] = { 26 };
+
+static const unsigned key7_pins[] = { 27 };
+static const unsigned audio_dte1_pins[] = { 27 };
+
+static const unsigned key8_pins[] = { 28 };
+static const unsigned key9_pins[] = { 29 };
+static const unsigned key10_pins[] = { 30 };
+static const unsigned key11_pins[] = { 31 };
+static const unsigned key12_pins[] = { 32 };
+static const unsigned key13_pins[] = { 33 };
+
+static const unsigned key14_pins[] = { 34 };
+static const unsigned audio_dte2_pins[] = { 34 };
+
+static const unsigned key15_pins[] = { 35 };
+static const unsigned audio_dte3_pins[] = { 35 };
+
+static const unsigned pwm0_pins[] = { 38 };
+static const unsigned pwm1_pins[] = { 39 };
+static const unsigned pwm2_pins[] = { 40 };
+static const unsigned pwm3_pins[] = { 41 };
+
+static const unsigned sdio0_pins[] = { 94, 95, 96, 97, 98, 99 };
+
+static const unsigned smart_card0_pins[] = { 42, 43, 44, 46, 47 };
+static const unsigned i2s0_0_pins[] = { 42, 43, 44, 46 };
+static const unsigned spdif_pins[] = { 47 };
+
+static const unsigned smart_card1_pins[] = { 48, 49, 50, 52, 53 };
+static const unsigned i2s1_0_pins[] = { 48, 49, 50, 52 };
+
+static const unsigned spi0_pins[] = { 54, 55, 56, 57 };
+
+static const unsigned spi1_pins[] = { 58, 59, 60, 61 };
+
+static const unsigned spi2_pins[] = { 62, 63, 64, 65 };
+
+static const unsigned spi3_pins[] = { 66, 67, 68, 69 };
+static const unsigned sw_led0_0_pins[] = { 66, 67, 68, 69 };
+
+static const unsigned d1w_pins[] = { 10, 11 };
+static const unsigned uart4_pins[] = { 10, 11 };
+static const unsigned sw_led2_0_pins[] = { 10, 11 };
+
+static const unsigned lcd_pins[] = { 126, 127, 128, 129, 130, 131, 132, 133,
+	134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147,
+	148, 149, 150, 151, 152, 153, 154, 155 };
+static const unsigned sram_0_pins[] = { 126, 127, 128, 129, 130, 131, 132, 133,
+	134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147,
+	148, 149, 150, 151, 152, 153, 154, 155 };
+static const unsigned spi5_pins[] = { 141, 142, 143, 144 };
+
+static const unsigned uart0_pins[] = { 70, 71, 72, 73 };
+static const unsigned sw_led0_1_pins[] = { 70, 71, 72, 73 };
+
+static const unsigned uart1_dte_pins[] = { 75, 76, 77, 78 };
+static const unsigned uart2_pins[] = { 75, 76, 77, 78 };
+
+static const unsigned uart1_pins[] = { 74, 79, 80, 81 };
+
+static const unsigned uart3_pins[] = { 82, 83 };
+
+static const unsigned qspi_0_pins[] = { 104, 105, 106, 107 };
+
+static const unsigned nand_pins[] = { 110, 111, 112, 113, 114, 115, 116, 117,
+	118, 119, 120, 121, 122, 123, 124, 125 };
+
+static const unsigned sdio0_cd_pins[] = { 103 };
+
+static const unsigned sdio0_mmc_pins[] = { 100, 101, 102 };
+
+static const unsigned sdio1_data_0_pins[] = { 86, 87 };
+static const unsigned can0_pins[] = { 86, 87 };
+static const unsigned spi4_0_pins[] = { 86, 87 };
+
+static const unsigned sdio1_data_1_pins[] = { 88, 89 };
+static const unsigned can1_pins[] = { 88, 89 };
+static const unsigned spi4_1_pins[] = { 88, 89 };
+
+static const unsigned sdio1_cd_pins[] = { 93 };
+
+static const unsigned sdio1_led_pins[] = { 84, 85 };
+static const unsigned sw_led2_1_pins[] = { 84, 85 };
+
+static const unsigned sdio1_mmc_pins[] = { 90, 91, 92 };
+
+static const unsigned cam_led_pins[] = { 156, 157, 158, 159, 160 };
+static const unsigned sw_led1_pins[] = { 156, 157, 158, 159 };
+
+static const unsigned cam_0_pins[] = { 169, 170, 171, 169, 170 };
+
+static const unsigned cam_1_pins[] = { 161, 162, 163, 164, 165, 166, 167,
+	168 };
+static const unsigned sram_1_pins[] = { 161, 162, 163, 164, 165, 166, 167,
+	168 };
+
+static const unsigned qspi_1_pins[] = { 108, 109 };
+
+static const unsigned smart_card0_fcb_pins[] = { 45 };
+static const unsigned i2s0_1_pins[] = { 45 };
+
+static const unsigned smart_card1_fcb_pins[] = { 51 };
+static const unsigned i2s1_1_pins[] = { 51 };
+
+static const unsigned gpio0_3p3_pins[] = { 176 };
+static const unsigned usb0_oc_pins[] = { 176 };
+
+static const unsigned gpio1_3p3_pins[] = { 177 };
+static const unsigned usb1_oc_pins[] = { 177 };
+
+static const unsigned gpio2_3p3_pins[] = { 178 };
+static const unsigned usb2_oc_pins[] = { 178 };
+
+#define CYGNUS_PIN_GROUP(group_name, off, sh, al)	\
+{							\
+	.name = __stringify(group_name) "_grp",		\
+	.pins = group_name ## _pins,			\
+	.num_pins = ARRAY_SIZE(group_name ## _pins),	\
+	.mux = {					\
+		.offset = off,				\
+		.shift = sh,				\
+		.alt = al,				\
+	}						\
+}
+
+/*
+ * List of Cygnus pin groups
+ */
+static const struct cygnus_pin_group cygnus_pin_groups[] = {
+	CYGNUS_PIN_GROUP(i2s2_0, 0x0, 0, 2),
+	CYGNUS_PIN_GROUP(i2s2_1, 0x0, 4, 2),
+	CYGNUS_PIN_GROUP(i2s2_2, 0x0, 8, 2),
+	CYGNUS_PIN_GROUP(i2s2_3, 0x0, 12, 2),
+	CYGNUS_PIN_GROUP(i2s2_4, 0x0, 16, 2),
+	CYGNUS_PIN_GROUP(pwm4, 0x0, 20, 0),
+	CYGNUS_PIN_GROUP(pwm5, 0x0, 24, 2),
+	CYGNUS_PIN_GROUP(key0, 0x4, 0, 1),
+	CYGNUS_PIN_GROUP(key1, 0x4, 4, 1),
+	CYGNUS_PIN_GROUP(key2, 0x4, 8, 1),
+	CYGNUS_PIN_GROUP(key3, 0x4, 12, 1),
+	CYGNUS_PIN_GROUP(key4, 0x4, 16, 1),
+	CYGNUS_PIN_GROUP(key5, 0x4, 20, 1),
+	CYGNUS_PIN_GROUP(key6, 0x4, 24, 1),
+	CYGNUS_PIN_GROUP(audio_dte0, 0x4, 24, 2),
+	CYGNUS_PIN_GROUP(key7, 0x4, 28, 1),
+	CYGNUS_PIN_GROUP(audio_dte1, 0x4, 28, 2),
+	CYGNUS_PIN_GROUP(key8, 0x8, 0, 1),
+	CYGNUS_PIN_GROUP(key9, 0x8, 4, 1),
+	CYGNUS_PIN_GROUP(key10, 0x8, 8, 1),
+	CYGNUS_PIN_GROUP(key11, 0x8, 12, 1),
+	CYGNUS_PIN_GROUP(key12, 0x8, 16, 1),
+	CYGNUS_PIN_GROUP(key13, 0x8, 20, 1),
+	CYGNUS_PIN_GROUP(key14, 0x8, 24, 1),
+	CYGNUS_PIN_GROUP(audio_dte2, 0x8, 24, 2),
+	CYGNUS_PIN_GROUP(key15, 0x8, 28, 1),
+	CYGNUS_PIN_GROUP(audio_dte3, 0x8, 28, 2),
+	CYGNUS_PIN_GROUP(pwm0, 0xc, 0, 0),
+	CYGNUS_PIN_GROUP(pwm1, 0xc, 4, 0),
+	CYGNUS_PIN_GROUP(pwm2, 0xc, 8, 0),
+	CYGNUS_PIN_GROUP(pwm3, 0xc, 12, 0),
+	CYGNUS_PIN_GROUP(sdio0, 0xc, 16, 0),
+	CYGNUS_PIN_GROUP(smart_card0, 0xc, 20, 0),
+	CYGNUS_PIN_GROUP(i2s0_0, 0xc, 20, 1),
+	CYGNUS_PIN_GROUP(spdif, 0xc, 20, 1),
+	CYGNUS_PIN_GROUP(smart_card1, 0xc, 24, 0),
+	CYGNUS_PIN_GROUP(i2s1_0, 0xc, 24, 1),
+	CYGNUS_PIN_GROUP(spi0, 0x10, 0, 0),
+	CYGNUS_PIN_GROUP(spi1, 0x10, 4, 0),
+	CYGNUS_PIN_GROUP(spi2, 0x10, 8, 0),
+	CYGNUS_PIN_GROUP(spi3, 0x10, 12, 0),
+	CYGNUS_PIN_GROUP(sw_led0_0, 0x10, 12, 2),
+	CYGNUS_PIN_GROUP(d1w, 0x10, 16, 0),
+	CYGNUS_PIN_GROUP(uart4, 0x10, 16, 1),
+	CYGNUS_PIN_GROUP(sw_led2_0, 0x10, 16, 2),
+	CYGNUS_PIN_GROUP(lcd, 0x10, 20, 0),
+	CYGNUS_PIN_GROUP(sram_0, 0x10, 20, 1),
+	CYGNUS_PIN_GROUP(spi5, 0x10, 20, 2),
+	CYGNUS_PIN_GROUP(uart0, 0x14, 0, 0),
+	CYGNUS_PIN_GROUP(sw_led0_1, 0x14, 0, 2),
+	CYGNUS_PIN_GROUP(uart1_dte, 0x14, 4, 0),
+	CYGNUS_PIN_GROUP(uart2, 0x14, 4, 1),
+	CYGNUS_PIN_GROUP(uart1, 0x14, 8, 0),
+	CYGNUS_PIN_GROUP(uart3, 0x14, 12, 0),
+	CYGNUS_PIN_GROUP(qspi_0, 0x14, 16, 0),
+	CYGNUS_PIN_GROUP(nand, 0x14, 20, 0),
+	CYGNUS_PIN_GROUP(sdio0_cd, 0x18, 0, 0),
+	CYGNUS_PIN_GROUP(sdio0_mmc, 0x18, 4, 0),
+	CYGNUS_PIN_GROUP(sdio1_data_0, 0x18, 8, 0),
+	CYGNUS_PIN_GROUP(can0, 0x18, 8, 1),
+	CYGNUS_PIN_GROUP(spi4_0, 0x18, 8, 2),
+	CYGNUS_PIN_GROUP(sdio1_data_1, 0x18, 12, 0),
+	CYGNUS_PIN_GROUP(can1, 0x18, 12, 1),
+	CYGNUS_PIN_GROUP(spi4_1, 0x18, 12, 2),
+	CYGNUS_PIN_GROUP(sdio1_cd, 0x18, 16, 0),
+	CYGNUS_PIN_GROUP(sdio1_led, 0x18, 20, 0),
+	CYGNUS_PIN_GROUP(sw_led2_1, 0x18, 20, 2),
+	CYGNUS_PIN_GROUP(sdio1_mmc, 0x18, 24, 0),
+	CYGNUS_PIN_GROUP(cam_led, 0x1c, 0, 0),
+	CYGNUS_PIN_GROUP(sw_led1, 0x1c, 0, 1),
+	CYGNUS_PIN_GROUP(cam_0, 0x1c, 4, 0),
+	CYGNUS_PIN_GROUP(cam_1, 0x1c, 8, 0),
+	CYGNUS_PIN_GROUP(sram_1, 0x1c, 8, 1),
+	CYGNUS_PIN_GROUP(qspi_1, 0x1c, 12, 0),
+	CYGNUS_PIN_GROUP(bsc1, 0x1c, 16, 0),
+	CYGNUS_PIN_GROUP(pcie_clkreq, 0x1c, 16, 1),
+	CYGNUS_PIN_GROUP(smart_card0_fcb, 0x20, 0, 0),
+	CYGNUS_PIN_GROUP(i2s0_1, 0x20, 0, 1),
+	CYGNUS_PIN_GROUP(smart_card1_fcb, 0x20, 4, 0),
+	CYGNUS_PIN_GROUP(i2s1_1, 0x20, 4, 1),
+	CYGNUS_PIN_GROUP(gpio0_3p3, 0x28, 0, 0),
+	CYGNUS_PIN_GROUP(usb0_oc, 0x28, 0, 1),
+	CYGNUS_PIN_GROUP(gpio1_3p3, 0x28, 4, 0),
+	CYGNUS_PIN_GROUP(usb1_oc, 0x28, 4, 1),
+	CYGNUS_PIN_GROUP(gpio2_3p3, 0x28, 8, 0),
+	CYGNUS_PIN_GROUP(usb2_oc, 0x28, 8, 1),
+};
+
+/*
+ * List of groups supported by functions
+ */
+static const char * const i2s0_grps[] = { "i2s0_0_grp", "i2s0_1_grp" };
+static const char * const i2s1_grps[] = { "i2s1_0_grp", "i2s1_1_grp" };
+static const char * const i2s2_grps[] = { "i2s2_0_grp", "i2s2_1_grp",
+	"i2s2_2_grp", "i2s2_3_grp", "i2s2_4_grp" };
+static const char * const spdif_grps[] = { "spdif_grp" };
+static const char * const pwm0_grps[] = { "pwm0_grp" };
+static const char * const pwm1_grps[] = { "pwm1_grp" };
+static const char * const pwm2_grps[] = { "pwm2_grp" };
+static const char * const pwm3_grps[] = { "pwm3_grp" };
+static const char * const pwm4_grps[] = { "pwm4_grp" };
+static const char * const pwm5_grps[] = { "pwm5_grp" };
+static const char * const key_grps[] = { "key0_grp", "key1_grp", "key2_grp",
+	"key3_grp", "key4_grp", "key5_grp", "key6_grp", "key7_grp", "key8_grp",
+	"key9_grp", "key10_grp", "key11_grp", "key12_grp", "key13_grp",
+	"key14_grp", "key15_grp" };
+static const char * const audio_dte_grps[] = { "audio_dte0_grp",
+	"audio_dte1_grp", "audio_dte2_grp", "audio_dte3_grp" };
+static const char * const smart_card0_grps[] = { "smart_card0_grp",
+	"smart_card0_fcb_grp" };
+static const char * const smart_card1_grps[] = { "smart_card1_grp",
+	"smart_card1_fcb_grp" };
+static const char * const spi0_grps[] = { "spi0_grp" };
+static const char * const spi1_grps[] = { "spi1_grp" };
+static const char * const spi2_grps[] = { "spi2_grp" };
+static const char * const spi3_grps[] = { "spi3_grp" };
+static const char * const spi4_grps[] = { "spi4_0_grp", "spi4_1_grp" };
+static const char * const spi5_grps[] = { "spi5_grp" };
+
+static const char * const sw_led0_grps[] = { "sw_led0_0_grp",
+	"sw_led0_1_grp" };
+static const char * const sw_led1_grps[] = { "sw_led1_grp" };
+static const char * const sw_led2_grps[] = { "sw_led2_0_grp",
+	"sw_led2_1_grp" };
+static const char * const d1w_grps[] = { "d1w_grp" };
+static const char * const lcd_grps[] = { "lcd_grp" };
+static const char * const sram_grps[] = { "sram_0_grp", "sram_1_grp" };
+
+static const char * const uart0_grps[] = { "uart0_grp" };
+static const char * const uart1_grps[] = { "uart1_grp", "uart1_dte_grp" };
+static const char * const uart2_grps[] = { "uart2_grp" };
+static const char * const uart3_grps[] = { "uart3_grp" };
+static const char * const uart4_grps[] = { "uart4_grp" };
+static const char * const qspi_grps[] = { "qspi_0_grp", "qspi_1_grp" };
+static const char * const nand_grps[] = { "nand_grp" };
+static const char * const sdio0_grps[] = { "sdio0_grp", "sdio0_cd_grp",
+	"sdio0_mmc_grp" };
+static const char * const sdio1_grps[] = { "sdio1_data_0_grp",
+	"sdio1_data_1_grp", "sdio1_cd_grp", "sdio1_led_grp", "sdio1_mmc_grp" };
+static const char * const can0_grps[] = { "can0_grp" };
+static const char * const can1_grps[] = { "can1_grp" };
+static const char * const cam_grps[] = { "cam_led_grp", "cam_0_grp",
+	"cam_1_grp" };
+static const char * const bsc1_grps[] = { "bsc1_grp" };
+static const char * const pcie_clkreq_grps[] = { "pcie_clkreq_grp" };
+static const char * const usb0_oc_grps[] = { "usb0_oc_grp" };
+static const char * const usb1_oc_grps[] = { "usb1_oc_grp" };
+static const char * const usb2_oc_grps[] = { "usb2_oc_grp" };
+
+#define CYGNUS_PIN_FUNCTION(func)				\
+{								\
+	.name = #func,						\
+	.groups = func ## _grps,				\
+	.num_groups = ARRAY_SIZE(func ## _grps),		\
+}
+
+/*
+ * List of supported functions in Cygnus
+ */
+static const struct cygnus_pin_function cygnus_pin_functions[] = {
+	CYGNUS_PIN_FUNCTION(i2s0),
+	CYGNUS_PIN_FUNCTION(i2s1),
+	CYGNUS_PIN_FUNCTION(i2s2),
+	CYGNUS_PIN_FUNCTION(spdif),
+	CYGNUS_PIN_FUNCTION(pwm0),
+	CYGNUS_PIN_FUNCTION(pwm1),
+	CYGNUS_PIN_FUNCTION(pwm2),
+	CYGNUS_PIN_FUNCTION(pwm3),
+	CYGNUS_PIN_FUNCTION(pwm4),
+	CYGNUS_PIN_FUNCTION(pwm5),
+	CYGNUS_PIN_FUNCTION(key),
+	CYGNUS_PIN_FUNCTION(audio_dte),
+	CYGNUS_PIN_FUNCTION(smart_card0),
+	CYGNUS_PIN_FUNCTION(smart_card1),
+	CYGNUS_PIN_FUNCTION(spi0),
+	CYGNUS_PIN_FUNCTION(spi1),
+	CYGNUS_PIN_FUNCTION(spi2),
+	CYGNUS_PIN_FUNCTION(spi3),
+	CYGNUS_PIN_FUNCTION(spi4),
+	CYGNUS_PIN_FUNCTION(spi5),
+	CYGNUS_PIN_FUNCTION(sw_led0),
+	CYGNUS_PIN_FUNCTION(sw_led1),
+	CYGNUS_PIN_FUNCTION(sw_led2),
+	CYGNUS_PIN_FUNCTION(d1w),
+	CYGNUS_PIN_FUNCTION(lcd),
+	CYGNUS_PIN_FUNCTION(sram),
+	CYGNUS_PIN_FUNCTION(uart0),
+	CYGNUS_PIN_FUNCTION(uart1),
+	CYGNUS_PIN_FUNCTION(uart2),
+	CYGNUS_PIN_FUNCTION(uart3),
+	CYGNUS_PIN_FUNCTION(uart4),
+	CYGNUS_PIN_FUNCTION(qspi),
+	CYGNUS_PIN_FUNCTION(nand),
+	CYGNUS_PIN_FUNCTION(sdio0),
+	CYGNUS_PIN_FUNCTION(sdio1),
+	CYGNUS_PIN_FUNCTION(can0),
+	CYGNUS_PIN_FUNCTION(can1),
+	CYGNUS_PIN_FUNCTION(cam),
+	CYGNUS_PIN_FUNCTION(bsc1),
+	CYGNUS_PIN_FUNCTION(pcie_clkreq),
+	CYGNUS_PIN_FUNCTION(usb0_oc),
+	CYGNUS_PIN_FUNCTION(usb1_oc),
+	CYGNUS_PIN_FUNCTION(usb2_oc),
+};
+
+static int cygnus_get_groups_count(struct pinctrl_dev *pctrl_dev)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->num_groups;
+}
+
+static const char *cygnus_get_group_name(struct pinctrl_dev *pctrl_dev,
+					 unsigned selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->groups[selector].name;
+}
+
+static int cygnus_get_group_pins(struct pinctrl_dev *pctrl_dev,
+				 unsigned selector, const unsigned **pins,
+				 unsigned *num_pins)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	*pins = pinctrl->groups[selector].pins;
+	*num_pins = pinctrl->groups[selector].num_pins;
+
+	return 0;
+}
+
+static void cygnus_pin_dbg_show(struct pinctrl_dev *pctrl_dev,
+				struct seq_file *s, unsigned offset)
+{
+	seq_printf(s, " %s", dev_name(pctrl_dev->dev));
+}
+
+static bool cygnus_function_is_valid(const char *function_name)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(cygnus_pin_functions); i++) {
+		if (!strcmp(cygnus_pin_functions[i].name, function_name))
+			return true;
+	}
+
+	return false;
+}
+
+/*
+ * TODO: Use API from pinctrl framework once "groups" parsing is supported
+ */
+static int cygnus_dt_node_to_map(struct pinctrl_dev *pctrl_dev,
+				 struct device_node *np,
+				 struct pinctrl_map **map,
+				 unsigned *num_maps)
+{
+	int ret, num_groups;
+	unsigned reserved_maps = 0;
+	struct property *prop;
+	const char *group_name, *function_name;
+
+	*map = NULL;
+	*num_maps = 0;
+
+	num_groups = of_property_count_strings(np, "groups");
+	if (num_groups < 0) {
+		dev_err(pctrl_dev->dev, "could not parse property groups\n");
+		return -EINVAL;
+	}
+
+	ret = of_property_read_string(np, "function", &function_name);
+	if (ret < 0) {
+		dev_err(pctrl_dev->dev,	"could not parse property function\n");
+		return -EINVAL;
+	}
+
+	/* check if it's a valid function */
+	if (!cygnus_function_is_valid(function_name)) {
+		dev_warn(pctrl_dev->dev, "invalid function name: %s\n",
+				function_name);
+	}
+
+	ret = pinctrl_utils_reserve_map(pctrl_dev, map, &reserved_maps,
+			num_maps, num_groups);
+	if (ret) {
+		dev_err(pctrl_dev->dev, "unable to reserve map\n");
+		return ret;
+	}
+
+	of_property_for_each_string(np, "groups", prop, group_name) {
+		ret = pinctrl_utils_add_map_mux(pctrl_dev, map,
+				&reserved_maps, num_maps, group_name,
+				function_name);
+		if (ret) {
+			dev_err(pctrl_dev->dev, "can't add map: %d\n", ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static const struct pinctrl_ops cygnus_pinctrl_ops = {
+	.get_groups_count = cygnus_get_groups_count,
+	.get_group_name = cygnus_get_group_name,
+	.get_group_pins = cygnus_get_group_pins,
+	.pin_dbg_show = cygnus_pin_dbg_show,
+	.dt_node_to_map = cygnus_dt_node_to_map,
+	.dt_free_map = pinctrl_utils_dt_free_map,
+};
+
+static int cygnus_get_functions_count(struct pinctrl_dev *pctrl_dev)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->num_functions;
+}
+
+static const char *cygnus_get_function_name(struct pinctrl_dev *pctrl_dev,
+					    unsigned selector)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	return pinctrl->functions[selector].name;
+}
+
+static int cygnus_get_function_groups(struct pinctrl_dev *pctrl_dev,
+				      unsigned selector,
+				      const char * const **groups,
+				      unsigned * const num_groups)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	*groups = pinctrl->functions[selector].groups;
+	*num_groups = pinctrl->functions[selector].num_groups;
+
+	return 0;
+}
+
+static int cygnus_pinmux_set(struct cygnus_pinctrl *pinctrl,
+			     const struct cygnus_pin_function *func,
+			     const struct cygnus_pin_group *grp,
+			     struct cygnus_mux_log *mux_log)
+{
+	const struct cygnus_mux *mux = &grp->mux;
+	int i;
+	u32 val, mask = 0x7;
+	unsigned long flags;
+
+	for (i = 0; i < CYGNUS_NUM_IOMUX; i++) {
+		if (mux->offset != mux_log[i].mux.offset ||
+		    mux->shift != mux_log[i].mux.shift)
+			continue;
+
+		/* match found if we reach here */
+
+		/* if this is a new configuration, just do it! */
+		if (!mux_log[i].is_configured)
+			break;
+
+		/*
+		 * IOMUX has been configured previously and one is trying to
+		 * configure it to a different function
+		 */
+		if (mux_log[i].mux.alt != mux->alt) {
+			dev_err(pinctrl->dev,
+				"double configuration error detected!\n");
+			dev_err(pinctrl->dev, "func:%s grp:%s\n",
+				func->name, grp->name);
+			return -EINVAL;
+		} else {
+			/*
+			 * One tries to configure it to the same function.
+			 * Just quit and don't bother
+			 */
+			return 0;
+		}
+	}
+
+	mux_log[i].mux.alt = mux->alt;
+	mux_log[i].is_configured = true;
+
+	spin_lock_irqsave(&pinctrl->lock, flags);
+
+	val = readl(pinctrl->base0 + grp->mux.offset);
+	val &= ~(mask << grp->mux.shift);
+	val |= grp->mux.alt << grp->mux.shift;
+	writel(val, pinctrl->base0 + grp->mux.offset);
+
+	spin_unlock_irqrestore(&pinctrl->lock, flags);
+
+	return 0;
+}
+
+static int cygnus_pinmux_set_mux(struct pinctrl_dev *pctrl_dev,
+				 unsigned func_select, unsigned grp_select)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+	const struct cygnus_pin_function *func =
+		&pinctrl->functions[func_select];
+	const struct cygnus_pin_group *grp = &pinctrl->groups[grp_select];
+
+	dev_dbg(pctrl_dev->dev, "func:%u name:%s grp:%u name:%s\n",
+		func_select, func->name, grp_select, grp->name);
+
+	dev_dbg(pctrl_dev->dev, "offset:0x%08x shift:%u alt:%u\n",
+		grp->mux.offset, grp->mux.shift, grp->mux.alt);
+
+	return cygnus_pinmux_set(pinctrl, func, grp, pinctrl->mux_log);
+}
+
+static int cygnus_gpio_request_enable(struct pinctrl_dev *pctrl_dev,
+				      struct pinctrl_gpio_range *range,
+				      unsigned pin)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+	const struct cygnus_gpio_mux *mux = pctrl_dev->desc->pins[pin].drv_data;
+	u32 val;
+	unsigned long flags;
+
+	/* not all pins support GPIO pinmux override */
+	if (!mux->is_supported)
+		return -ENOTSUPP;
+
+	spin_lock_irqsave(&pinctrl->lock, flags);
+
+	val = readl(pinctrl->base1 + mux->offset);
+	val |= 0x3 << mux->shift;
+	writel(val, pinctrl->base1 + mux->offset);
+
+	spin_unlock_irqrestore(&pinctrl->lock, flags);
+
+	dev_dbg(pctrl_dev->dev,
+		"gpio request enable pin=%u offset=0x%x shift=%u\n",
+		pin, mux->offset, mux->shift);
+
+	return 0;
+}
+
+static void cygnus_gpio_disable_free(struct pinctrl_dev *pctrl_dev,
+				     struct pinctrl_gpio_range *range,
+				     unsigned pin)
+{
+	struct cygnus_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+	struct cygnus_gpio_mux *mux = pctrl_dev->desc->pins[pin].drv_data;
+	u32 val;
+	unsigned long flags;
+
+	if (!mux->is_supported)
+		return;
+
+	spin_lock_irqsave(&pinctrl->lock, flags);
+
+	val = readl(pinctrl->base1 + mux->offset);
+	val &= ~(0x3 << mux->shift);
+	writel(val, pinctrl->base1 + mux->offset);
+
+	spin_unlock_irqrestore(&pinctrl->lock, flags);
+
+	dev_err(pctrl_dev->dev,
+		"gpio disable free pin=%u offset=0x%x shift=%u\n",
+		pin, mux->offset, mux->shift);
+}
+
+static const struct pinmux_ops cygnus_pinmux_ops = {
+	.get_functions_count = cygnus_get_functions_count,
+	.get_function_name = cygnus_get_function_name,
+	.get_function_groups = cygnus_get_function_groups,
+	.set_mux = cygnus_pinmux_set_mux,
+	.gpio_request_enable = cygnus_gpio_request_enable,
+	.gpio_disable_free = cygnus_gpio_disable_free,
+};
+
+static struct pinctrl_desc cygnus_pinctrl_desc = {
+	.name = "cygnus-pinmux",
+	.pctlops = &cygnus_pinctrl_ops,
+	.pmxops = &cygnus_pinmux_ops,
+};
+
+static int cygnus_mux_log_init(struct cygnus_pinctrl *pinctrl)
+{
+	struct cygnus_mux_log *log;
+	unsigned int i, j;
+
+	pinctrl->mux_log = devm_kcalloc(pinctrl->dev, CYGNUS_NUM_IOMUX,
+					sizeof(struct cygnus_mux_log),
+					GFP_KERNEL);
+	if (!pinctrl->mux_log)
+		return -ENOMEM;
+
+	log = pinctrl->mux_log;
+	for (i = 0; i < CYGNUS_NUM_IOMUX_REGS; i++) {
+		for (j = 0; j < CYGNUS_NUM_MUX_PER_REG; j++) {
+			log = &pinctrl->mux_log[i * CYGNUS_NUM_MUX_PER_REG
+				+ j];
+			log->mux.offset = i * 4;
+			log->mux.shift = j * 4;
+			log->mux.alt = 0;
+			log->is_configured = false;
+		}
+	}
+
+	return 0;
+}
+
+static int cygnus_pinmux_probe(struct platform_device *pdev)
+{
+	struct cygnus_pinctrl *pinctrl;
+	struct resource *res;
+	int i, ret;
+	struct pinctrl_pin_desc *pins;
+	unsigned num_pins = ARRAY_SIZE(cygnus_pins);
+
+	pinctrl = devm_kzalloc(&pdev->dev, sizeof(*pinctrl), GFP_KERNEL);
+	if (!pinctrl)
+		return -ENOMEM;
+
+	pinctrl->dev = &pdev->dev;
+	platform_set_drvdata(pdev, pinctrl);
+	spin_lock_init(&pinctrl->lock);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	pinctrl->base0 = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(pinctrl->base0)) {
+		dev_err(&pdev->dev, "unable to map I/O space\n");
+		return PTR_ERR(pinctrl->base0);
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	pinctrl->base1 = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(pinctrl->base1)) {
+		dev_err(&pdev->dev, "unable to map I/O space\n");
+		return PTR_ERR(pinctrl->base1);
+	}
+
+	ret = cygnus_mux_log_init(pinctrl);
+	if (ret) {
+		dev_err(&pdev->dev, "unable to initialize IOMUX log\n");
+		return ret;
+	}
+
+	pins = devm_kcalloc(&pdev->dev, num_pins, sizeof(*pins), GFP_KERNEL);
+	if (!pins)
+		return -ENOMEM;
+
+	for (i = 0; i < num_pins; i++) {
+		pins[i].number = cygnus_pins[i].pin;
+		pins[i].name = cygnus_pins[i].name;
+		pins[i].drv_data = &cygnus_pins[i].gpio_mux;
+	}
+
+	pinctrl->groups = cygnus_pin_groups;
+	pinctrl->num_groups = ARRAY_SIZE(cygnus_pin_groups);
+	pinctrl->functions = cygnus_pin_functions;
+	pinctrl->num_functions = ARRAY_SIZE(cygnus_pin_functions);
+	cygnus_pinctrl_desc.pins = pins;
+	cygnus_pinctrl_desc.npins = num_pins;
+
+	pinctrl->pctl = pinctrl_register(&cygnus_pinctrl_desc, &pdev->dev,
+			pinctrl);
+	if (!pinctrl->pctl) {
+		dev_err(&pdev->dev, "unable to register Cygnus IOMUX pinctrl\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static struct of_device_id cygnus_pinmux_of_match[] = {
+	{ .compatible = "brcm,cygnus-pinmux" },
+	{ }
+};
+
+static struct platform_driver cygnus_pinmux_driver = {
+	.driver = {
+		.name = "cygnus-pinmux",
+		.of_match_table = cygnus_pinmux_of_match,
+		.suppress_bind_attrs = true,
+	},
+	.probe = cygnus_pinmux_probe,
+};
+
+static int __init cygnus_pinmux_init(void)
+{
+	return platform_driver_register(&cygnus_pinmux_driver);
+}
+arch_initcall(cygnus_pinmux_init);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus IOMUX driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v4 4/4] ARM: dts: enable IOMUX for Broadcom Cygnus

[Ray Jui]

This enables the IOMUX support for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..b014ce5 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -54,6 +54,12 @@
 
 	/include/ "bcm-cygnus-clock.dtsi"
 
+	pinctrl: pinctrl@0x0301d0c8 {
+		compatible = "brcm,cygnus-pinmux";
+		reg = <0x0301d0c8 0x30>,
+		      <0x0301d24c 0x2c>;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

[PATCH v4 4/4] ARM: dts: enable IOMUX for Broadcom Cygnus

[Ray Jui]

This enables the IOMUX support for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..b014ce5 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -54,6 +54,12 @@
 
 	/include/ "bcm-cygnus-clock.dtsi"
 
+	pinctrl: pinctrl@0x0301d0c8 {
+		compatible = "brcm,cygnus-pinmux";
+		reg = <0x0301d0c8 0x30>,
+		      <0x0301d24c 0x2c>;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

[PATCH v4 4/4] ARM: dts: enable IOMUX for Broadcom Cygnus

[Ray Jui]

This enables the IOMUX support for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..b014ce5 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -54,6 +54,12 @@
 
 	/include/ "bcm-cygnus-clock.dtsi"
 
+	pinctrl: pinctrl at 0x0301d0c8 {
+		compatible = "brcm,cygnus-pinmux";
+		reg = <0x0301d0c8 0x30>,
+		      <0x0301d24c 0x2c>;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

Re: [PATCH v7 2/4] pinctrl: cygnus: add gpio/pinconf driver

[Ray Jui]

On 2/3/2015 5:41 PM, Dmitry Torokhov wrote:
> On Tue, Feb 03, 2015 at 05:09:06PM -0800, Ray Jui wrote:
>> This adds the initial support of the Broadcom Cygnus GPIO/PINCONF driver
>> that supports all 3 GPIO controllers on Cygnus including the ASIU GPIO
>> controller, the chipCommonG GPIO controller, and the always-on GPIO
>> controller. Basic PINCONF configurations such as bias pull up/down, and
>> drive strength are also supported in this driver.
>>
>> Pins from the ASIU GPIO controller can be individually muxed to GPIO
>> function, through interaction with the Cygnus IOMUX controller
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>> ---
>>  drivers/pinctrl/bcm/Kconfig               |   22 +
>>  drivers/pinctrl/bcm/Makefile              |    1 +
>>  drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c |  920 +++++++++++++++++++++++++++++
>>  3 files changed, 943 insertions(+)
>>  create mode 100644 drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c
>>
>> diff --git a/drivers/pinctrl/bcm/Kconfig b/drivers/pinctrl/bcm/Kconfig
>> index eb13201..cd11d4d 100644
>> --- a/drivers/pinctrl/bcm/Kconfig
>> +++ b/drivers/pinctrl/bcm/Kconfig
>> @@ -20,6 +20,28 @@ config PINCTRL_BCM2835
>>  	select PINMUX
>>  	select PINCONF
>>  
>> +config PINCTRL_CYGNUS_GPIO
>> +	bool "Broadcom Cygnus GPIO (with PINCONF) driver"
>> +	depends on OF_GPIO && ARCH_BCM_CYGNUS
>> +	select GPIOLIB_IRQCHIP
>> +	select PINCONF
>> +	select GENERIC_PINCONF
>> +	default ARCH_BCM_CYGNUS
>> +	help
>> +	  Say yes here to enable the Broadcom Cygnus GPIO driver.
>> +
>> +	  The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
>> +	  GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
>> +	  the always-ON GPIO controller (CRMU/AON). All 3 GPIO controllers are
>> +	  supported by this driver.
>> +
>> +	  All 3 Cygnus GPIO controllers support basic PINCONF functions such
>> +	  as bias pull up, pull down, and drive strength configurations, when
>> +	  these pins are muxed to GPIO.
>> +
>> +	  Pins from the ASIU GPIO can be individually muxed to GPIO function,
>> +	  through interaction with the Cygnus IOMUX controller.
>> +
>>  config PINCTRL_CYGNUS_MUX
>>  	bool "Broadcom Cygnus IOMUX driver"
>>  	depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
>> diff --git a/drivers/pinctrl/bcm/Makefile b/drivers/pinctrl/bcm/Makefile
>> index bb6beb6..2b2f70e 100644
>> --- a/drivers/pinctrl/bcm/Makefile
>> +++ b/drivers/pinctrl/bcm/Makefile
>> @@ -2,4 +2,5 @@
>>  
>>  obj-$(CONFIG_PINCTRL_BCM281XX)		+= pinctrl-bcm281xx.o
>>  obj-$(CONFIG_PINCTRL_BCM2835)		+= pinctrl-bcm2835.o
>> +obj-$(CONFIG_PINCTRL_CYGNUS_GPIO)	+= pinctrl-cygnus-gpio.o
>>  obj-$(CONFIG_PINCTRL_CYGNUS_MUX)	+= pinctrl-cygnus-mux.o
>> diff --git a/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c b/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c
>> new file mode 100644
>> index 0000000..cfe4478
>> --- /dev/null
>> +++ b/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c
>> @@ -0,0 +1,920 @@
>> +/*
>> + * Copyright (C) 2014-2015 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + *
>> + * This file contains the Broadcom Cygnus GPIO driver that supports 3
>> + * GPIO controllers on Cygnus including the ASIU GPIO controller, the
>> + * chipCommonG GPIO controller, and the always-on GPIO controller. Basic
>> + * PINCONF such as bias pull up/down, and drive strength are also supported
>> + * in this driver.
>> + *
>> + * Pins from the ASIU GPIO can be individually muxed to GPIO function,
>> + * through the interaction with the Cygnus IOMUX controller
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/slab.h>
>> +#include <linux/module.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/io.h>
>> +#include <linux/gpio.h>
>> +#include <linux/ioport.h>
>> +#include <linux/of_device.h>
>> +#include <linux/of_irq.h>
>> +#include <linux/pinctrl/pinctrl.h>
>> +#include <linux/pinctrl/pinmux.h>
>> +#include <linux/pinctrl/pinconf.h>
>> +#include <linux/pinctrl/pinconf-generic.h>
>> +
>> +#include "../pinctrl-utils.h"
>> +
>> +#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
>> +#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
>> +#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
>> +#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
>> +#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
>> +#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
>> +#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
>> +#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
>> +#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
>> +#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
>> +#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
>> +#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
>> +
>> +/* drive strength control for ASIU GPIO */
>> +#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
>> +
>> +/* drive strength control for CCM/CRMU (AON) GPIO */
>> +#define CYGNUS_GPIO_DRV0_CTRL_OFFSET  0x00
>> +
>> +#define GPIO_BANK_SIZE 0x200
>> +#define NGPIOS_PER_BANK 32
>> +#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
>> +
>> +#define CYGNUS_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + (reg))
>> +#define CYGNUS_GPIO_SHIFT(pin) ((pin) % NGPIOS_PER_BANK)
>> +
>> +#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
>> +#define GPIO_DRV_STRENGTH_BITS       3
>> +#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
>> +
>> +/*
>> + * Cygnus GPIO core
>> + *
>> + * @dev: pointer to device
>> + * @base: I/O register base for Cygnus GPIO controller
>> + * @io_ctrl: I/O register base for certain type of Cygnus GPIO controller that
>> + * has the PINCONF support implemented outside of the GPIO block
>> + * @lock: lock to protect access to I/O registers
>> + * @gc: GPIO chip
>> + * @num_banks: number of GPIO banks, each bank supports up to 32 GPIOs
>> + * @pinmux_is_supported: flag to indicate this GPIO controller contains pins
>> + * that can be individually muxed to GPIO
>> + * @pctl: pointer to pinctrl_dev
>> + * @pctldesc: pinctrl descriptor
>> + * @pins: pointer to array of pins
>> + */
>> +struct cygnus_gpio {
>> +	struct device *dev;
>> +
>> +	void __iomem *base;
>> +	void __iomem *io_ctrl;
>> +
>> +	spinlock_t lock;
>> +
>> +	struct gpio_chip gc;
>> +	unsigned num_banks;
>> +
>> +	int pinmux_is_supported;
> 
> bool?
> 
Yes. Will do.

>> +
>> +	struct pinctrl_dev *pctl;
>> +	struct pinctrl_desc pctldesc;
>> +	struct pinctrl_pin_desc *pins;
>> +};
>> +
>> +static struct cygnus_gpio *to_cygnus_gpio(struct gpio_chip *gc)
>> +{
>> +	return container_of(gc, struct cygnus_gpio, gc);
>> +}
>> +
>> +/*
>> + * Mapping from PINCONF pins to GPIO pins is 1-to-1
>> + */
>> +static unsigned cygnus_pin_to_gpio(unsigned pin)
>> +{
>> +	return pin;
>> +}
>> +
>> +static u32 cygnus_readl(struct cygnus_gpio *chip, unsigned int offset)
>> +{
>> +	return readl(chip->base + offset);
>> +}
>> +
>> +static void cygnus_writel(struct cygnus_gpio *chip, unsigned int offset,
>> +			  u32 val)
>> +{
>> +	writel(val, chip->base + offset);
>> +}
>> +
>> +/**
>> + *  cygnus_set_bit - set or clear one bit (corresponding to the GPIO pin) in a
>> + *  Cygnus GPIO register
>> + *
>> + *  @cygnus_gpio: Cygnus GPIO device
>> + *  @reg: register offset
>> + *  @gpio: GPIO pin
>> + *  @set: set or clear. 1 - set; 0 -clear
>> + */
>> +static void cygnus_set_bit(struct cygnus_gpio *chip, unsigned int reg,
>> +			   unsigned gpio, int set)
>> +{
>> +	unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
>> +	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
>> +	u32 val;
>> +
>> +	val = cygnus_readl(chip, offset);
>> +	if (set)
>> +		val |= BIT(shift);
>> +	else
>> +		val &= ~BIT(shift);
>> +	cygnus_writel(chip, offset, val);
>> +}
>> +
>> +static int cygnus_get_bit(struct cygnus_gpio *chip, unsigned int reg,
>> +			  unsigned gpio)
>> +{
>> +	unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
>> +	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
>> +	u32 val;
>> +
>> +	val = cygnus_readl(chip, offset) & BIT(shift);
>> +	if (val)
>> +		return 1;
>> +	else
>> +		return 0;
>> +}
>> +
>> +static void cygnus_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
>> +{
>> +	struct gpio_chip *gc = irq_desc_get_handler_data(desc);
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	struct irq_chip *irq_chip = irq_desc_get_chip(desc);
>> +	int i, bit;
>> +
>> +	chained_irq_enter(irq_chip, desc);
>> +
>> +	/* go through the entire GPIO banks and handle all interrupts */
>> +	for (i = 0; i < chip->num_banks; i++) {
>> +		unsigned long val = cygnus_readl(chip,
>> +				(i * GPIO_BANK_SIZE) +
>> +				CYGNUS_GPIO_INT_MSTAT_OFFSET);
>> +
>> +		for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
>> +			unsigned pin = NGPIOS_PER_BANK * i + bit;
>> +			int child_irq = irq_find_mapping(gc->irqdomain, pin);
>> +
>> +			/*
>> +			 * Clear the interrupt before invoking the
>> +			 * handler, so we do not leave any window
>> +			 */
>> +			cygnus_writel(chip, (i * GPIO_BANK_SIZE) +
>> +				      CYGNUS_GPIO_INT_CLR_OFFSET, BIT(bit));
>> +
>> +			generic_handle_irq(child_irq);
>> +		}
>> +	}
>> +
>> +	chained_irq_exit(irq_chip, desc);
>> +}
>> +
>> +
>> +static void cygnus_gpio_irq_ack(struct irq_data *d)
>> +{
>> +	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	unsigned gpio = d->hwirq;
>> +	unsigned int offset = CYGNUS_GPIO_REG(gpio,
>> +			CYGNUS_GPIO_INT_CLR_OFFSET);
>> +	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
>> +	u32 val = BIT(shift);
>> +
>> +	cygnus_writel(chip, offset, val);
>> +}
>> +
>> +/**
>> + *  cygnus_gpio_irq_set_mask - mask/unmask a GPIO interrupt
>> + *
>> + *  @d: IRQ chip data
>> + *  @mask: mask/unmask GPIO interrupt. 0 - mask (disable); 1 - unmask (enable)
>> + */
>> +static void cygnus_gpio_irq_set_mask(struct irq_data *d, int mask)
>> +{
>> +	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	unsigned gpio = d->hwirq;
>> +
>> +	cygnus_set_bit(chip, CYGNUS_GPIO_INT_MSK_OFFSET, gpio, mask);
>> +}
>> +
>> +static void cygnus_gpio_irq_mask(struct irq_data *d)
>> +{
>> +	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	unsigned long flags;
>> +
>> +	spin_lock_irqsave(&chip->lock, flags);
>> +	cygnus_gpio_irq_set_mask(d, 0);
>> +	spin_unlock_irqrestore(&chip->lock, flags);
>> +}
>> +
>> +static void cygnus_gpio_irq_unmask(struct irq_data *d)
>> +{
>> +	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	unsigned long flags;
>> +
>> +	spin_lock_irqsave(&chip->lock, flags);
>> +	cygnus_gpio_irq_set_mask(d, 1);
>> +	spin_unlock_irqrestore(&chip->lock, flags);
>> +}
>> +
>> +static int cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
>> +{
>> +	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	unsigned gpio = d->hwirq;
>> +	int int_type = 0, dual_edge = 0, edge_lvl = 0;
>> +	unsigned long flags;
>> +
>> +	switch (type & IRQ_TYPE_SENSE_MASK) {
>> +	case IRQ_TYPE_EDGE_RISING:
>> +		edge_lvl = 1;
>> +		break;
>> +
>> +	case IRQ_TYPE_EDGE_FALLING:
>> +		break;
>> +
>> +	case IRQ_TYPE_EDGE_BOTH:
>> +		dual_edge = 1;
>> +		break;
>> +
>> +	case IRQ_TYPE_LEVEL_HIGH:
>> +		int_type = 1;
>> +		edge_lvl = 1;
>> +		break;
>> +
>> +	case IRQ_TYPE_LEVEL_LOW:
>> +		int_type = 1;
>> +		break;
>> +
>> +	default:
>> +		dev_err(chip->dev, "invalid GPIO IRQ type 0x%x\n",
>> +			type);
>> +		return -EINVAL;
>> +	}
>> +
>> +	spin_lock_irqsave(&chip->lock, flags);
>> +	cygnus_set_bit(chip, CYGNUS_GPIO_IN_TYPE_OFFSET, gpio, int_type);
>> +	cygnus_set_bit(chip, CYGNUS_GPIO_INT_DE_OFFSET, gpio, dual_edge);
>> +	cygnus_set_bit(chip, CYGNUS_GPIO_INT_EDGE_OFFSET, gpio,
>> +		       edge_lvl);
>> +	spin_unlock_irqrestore(&chip->lock, flags);
>> +
>> +	dev_dbg(chip->dev,
>> +		"gpio:%u set int_type:%d dual_edge:%d edge_lvl:%d\n",
>> +		gpio, int_type, dual_edge, edge_lvl);
>> +
>> +	return 0;
>> +}
>> +
>> +static struct irq_chip cygnus_gpio_irq_chip = {
>> +	.name = "bcm-cygnus-gpio",
>> +	.irq_ack = cygnus_gpio_irq_ack,
>> +	.irq_mask = cygnus_gpio_irq_mask,
>> +	.irq_unmask = cygnus_gpio_irq_unmask,
>> +	.irq_set_type = cygnus_gpio_irq_set_type,
>> +};
>> +
>> +/*
>> + * Request the Cygnus IOMUX pinmux controller to mux individual pins to GPIO
>> + */
>> +static int cygnus_gpio_request(struct gpio_chip *gc, unsigned offset)
>> +{
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	unsigned gpio = gc->base + offset;
>> +
>> +	/* not all Cygnus GPIO pins can be muxed individually */
>> +	if (!chip->pinmux_is_supported)
>> +		return 0;
>> +
>> +	return pinctrl_request_gpio(gpio);
>> +}
>> +
>> +static void cygnus_gpio_free(struct gpio_chip *gc, unsigned offset)
>> +{
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	unsigned gpio = gc->base + offset;
>> +
>> +	if (!chip->pinmux_is_supported)
>> +		return;
>> +
>> +	pinctrl_free_gpio(gpio);
>> +}
>> +
>> +static int cygnus_gpio_direction_input(struct gpio_chip *gc, unsigned gpio)
>> +{
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	unsigned long flags;
>> +
>> +	spin_lock_irqsave(&chip->lock, flags);
>> +	cygnus_set_bit(chip, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 0);
>> +	spin_unlock_irqrestore(&chip->lock, flags);
>> +
>> +	dev_dbg(chip->dev, "gpio:%u set input\n", gpio);
>> +
>> +	return 0;
>> +}
>> +
>> +static int cygnus_gpio_direction_output(struct gpio_chip *gc, unsigned gpio,
>> +					int value)
>> +{
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	unsigned long flags;
>> +
>> +	spin_lock_irqsave(&chip->lock, flags);
>> +	cygnus_set_bit(chip, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 1);
>> +	cygnus_set_bit(chip, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
>> +	spin_unlock_irqrestore(&chip->lock, flags);
>> +
>> +	dev_dbg(chip->dev, "gpio:%u set output, value:%d\n", gpio, value);
>> +
>> +	return 0;
>> +}
>> +
>> +static void cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio, int value)
>> +{
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	unsigned long flags;
>> +
>> +	spin_lock_irqsave(&chip->lock, flags);
>> +	cygnus_set_bit(chip, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
>> +	spin_unlock_irqrestore(&chip->lock, flags);
>> +
>> +	dev_dbg(chip->dev, "gpio:%u set, value:%d\n", gpio, value);
>> +}
>> +
>> +static int cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
>> +{
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	unsigned int offset = CYGNUS_GPIO_REG(gpio,
>> +					      CYGNUS_GPIO_DATA_IN_OFFSET);
>> +	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
>> +
>> +	return !!(cygnus_readl(chip, offset) & BIT(shift));
>> +}
>> +
>> +static int cygnus_get_groups_count(struct pinctrl_dev *pctldev)
>> +{
>> +	return 1;
>> +}
>> +
>> +/*
>> + * Only one group: "gpio_grp", since this local pinctrl device only performs
>> + * GPIO specific PINCONF configurations
>> + */
>> +static const char *cygnus_get_group_name(struct pinctrl_dev *pctldev,
>> +					 unsigned selector)
>> +{
>> +
> 
> Extra blank line.
> 
Thanks!

>> +	return "gpio_grp";
>> +}
>> +
>> +static const struct pinctrl_ops cygnus_pctrl_ops = {
>> +	.get_groups_count = cygnus_get_groups_count,
>> +	.get_group_name = cygnus_get_group_name,
>> +	.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
>> +	.dt_free_map = pinctrl_utils_dt_free_map,
>> +};
>> +
>> +static int cygnus_gpio_set_pull(struct cygnus_gpio *chip, unsigned gpio,
>> +				int disable, int pull_up)
>> +{
>> +	unsigned long flags;
>> +
>> +	spin_lock_irqsave(&chip->lock, flags);
>> +
>> +	if (disable) {
>> +		cygnus_set_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio, 0);
>> +	} else {
>> +		cygnus_set_bit(chip, CYGNUS_GPIO_PAD_RES_OFFSET, gpio,
>> +			       pull_up);
>> +		cygnus_set_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio, 1);
>> +	}
>> +
>> +	spin_unlock_irqrestore(&chip->lock, flags);
>> +
>> +	dev_dbg(chip->dev, "gpio:%u set pullup:%d\n", gpio, pull_up);
>> +
>> +	return 0;
>> +}
>> +
>> +static void cygnus_gpio_get_pull(struct cygnus_gpio *chip, unsigned gpio,
>> +				 int *disable, int *pull_up)
>> +{
>> +	unsigned long flags;
>> +
>> +	spin_lock_irqsave(&chip->lock, flags);
>> +	*disable = !cygnus_get_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio);
>> +	*pull_up = cygnus_get_bit(chip, CYGNUS_GPIO_PAD_RES_OFFSET, gpio);
>> +	spin_unlock_irqrestore(&chip->lock, flags);
>> +}
>> +
>> +static int cygnus_gpio_set_strength(struct cygnus_gpio *chip, unsigned gpio,
>> +				    unsigned strength)
>> +{
>> +	void __iomem *base;
>> +	unsigned int i, offset, shift;
>> +	u32 val;
>> +	unsigned long flags;
>> +
>> +	/* make sure drive strength is supported */
>> +	if (strength < 2 ||  strength > 16 || (strength % 2))
>> +		return -ENOTSUPP;
>> +
>> +	if (chip->io_ctrl) {
>> +		base = chip->io_ctrl;
>> +		offset = CYGNUS_GPIO_DRV0_CTRL_OFFSET;
>> +	} else {
>> +		base = chip->base;
>> +		offset = CYGNUS_GPIO_REG(gpio,
>> +					 CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET);
>> +	}
>> +
>> +	shift = CYGNUS_GPIO_SHIFT(gpio);
>> +
>> +	dev_dbg(chip->dev, "gpio:%u set drive strength:%d mA\n", gpio,
>> +		strength);
>> +
>> +	spin_lock_irqsave(&chip->lock, flags);
>> +	strength = (strength / 2) - 1;
>> +	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
>> +		val = readl(base + offset);
>> +		val &= ~BIT(shift);
>> +		val |= ((strength >> i) & 0x1) << shift;
>> +		writel(val, base + offset);
>> +		offset += 4;
>> +	}
>> +	spin_unlock_irqrestore(&chip->lock, flags);
>> +
>> +	return 0;
>> +}
>> +
>> +static int cygnus_gpio_get_strength(struct cygnus_gpio *chip, unsigned gpio,
>> +				    u16 *strength)
>> +{
>> +	void __iomem *base;
>> +	unsigned int i, offset, shift;
>> +	u32 val;
>> +	unsigned long flags;
>> +
>> +	if (chip->io_ctrl) {
>> +		base = chip->io_ctrl;
>> +		offset = CYGNUS_GPIO_DRV0_CTRL_OFFSET;
>> +	} else {
>> +		base = chip->base;
>> +		offset = CYGNUS_GPIO_REG(gpio,
>> +					 CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET);
>> +	}
>> +
>> +	shift = CYGNUS_GPIO_SHIFT(gpio);
>> +
>> +	spin_lock_irqsave(&chip->lock, flags);
>> +	*strength = 0;
>> +	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
>> +		val = readl(base + offset) & BIT(shift);
>> +		val >>= shift;
>> +		*strength += (val << i);
>> +		offset += 4;
>> +	}
>> +
>> +	/* convert to mA */
>> +	*strength = (*strength + 1) * 2;
>> +	spin_unlock_irqrestore(&chip->lock, flags);
>> +
>> +	return 0;
>> +}
>> +
>> +static int cygnus_pin_config_get(struct pinctrl_dev *pctldev, unsigned pin,
>> +				 unsigned long *config)
>> +{
>> +	struct cygnus_gpio *chip = pinctrl_dev_get_drvdata(pctldev);
>> +	enum pin_config_param param = pinconf_to_config_param(*config);
>> +	unsigned gpio = cygnus_pin_to_gpio(pin);
>> +	u16 arg;
>> +	int disable, pull_up, ret;
>> +
>> +	switch (param) {
>> +	case PIN_CONFIG_BIAS_DISABLE:
>> +		cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
>> +		if (disable)
>> +			return 0;
>> +		else
>> +			return -EINVAL;
>> +
>> +	case PIN_CONFIG_BIAS_PULL_UP:
>> +		cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
>> +		if (!disable && pull_up)
>> +			return 0;
>> +		else
>> +			return -EINVAL;
>> +
>> +	case PIN_CONFIG_BIAS_PULL_DOWN:
>> +		cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
>> +		if (!disable && !pull_up)
>> +			return 0;
>> +		else
>> +			return -EINVAL;
>> +
>> +	case PIN_CONFIG_DRIVE_STRENGTH:
>> +		ret = cygnus_gpio_get_strength(chip, gpio, &arg);
>> +		if (ret)
>> +			return ret;
>> +		else
>> +			*config = pinconf_to_config_packed(param, arg);
>> +
>> +		return 0;
>> +
>> +	default:
>> +		return -ENOTSUPP;
>> +	}
>> +
>> +	return -ENOTSUPP;
>> +}
>> +
>> +static int cygnus_pin_config_set(struct pinctrl_dev *pctldev, unsigned pin,
>> +				 unsigned long *configs, unsigned num_configs)
>> +{
>> +	struct cygnus_gpio *chip = pinctrl_dev_get_drvdata(pctldev);
>> +	enum pin_config_param param;
>> +	u16 arg;
>> +	unsigned i, gpio = cygnus_pin_to_gpio(pin);
>> +	int ret = -ENOTSUPP;
>> +
>> +	for (i = 0; i < num_configs; i++) {
>> +		param = pinconf_to_config_param(configs[i]);
>> +		arg = pinconf_to_config_argument(configs[i]);
>> +
>> +		switch (param) {
>> +		case PIN_CONFIG_BIAS_DISABLE:
>> +			ret = cygnus_gpio_set_pull(chip, gpio, 1, 0);
>> +			if (ret < 0)
>> +				goto out;
>> +			break;
>> +
>> +		case PIN_CONFIG_BIAS_PULL_UP:
>> +			ret = cygnus_gpio_set_pull(chip, gpio, 0, 1);
>> +			if (ret < 0)
>> +				goto out;
>> +			break;
>> +
>> +		case PIN_CONFIG_BIAS_PULL_DOWN:
>> +			ret = cygnus_gpio_set_pull(chip, gpio, 0, 0);
>> +			if (ret < 0)
>> +				goto out;
>> +			break;
>> +
>> +		case PIN_CONFIG_DRIVE_STRENGTH:
>> +			ret = cygnus_gpio_set_strength(chip, gpio, arg);
>> +			if (ret < 0)
>> +				goto out;
>> +			break;
>> +
>> +		default:
>> +			dev_err(chip->dev, "invalid configuration\n");
>> +			return -ENOTSUPP;
>> +		}
>> +	} /* for each config */
>> +
>> +out:
>> +	return ret;
>> +}
>> +
>> +static const struct pinconf_ops cygnus_pconf_ops = {
>> +	.is_generic = true,
>> +	.pin_config_get = cygnus_pin_config_get,
>> +	.pin_config_set = cygnus_pin_config_set,
>> +};
>> +
>> +/*
>> + * Map a GPIO in the local gpio_chip pin space to a pin in the Cygnus IOMUX
>> + * pinctrl pin space
>> + */
>> +struct cygnus_gpio_pin_range {
>> +	unsigned offset;
>> +	unsigned pin_base;
>> +	unsigned num_pins;
>> +};
>> +
>> +#define CYGNUS_PINRANGE(o, p, n) { .offset = o, .pin_base = p, .num_pins = n }
>> +
>> +/*
>> + * Pin mapping table for mapping local GPIO pins to Cygnus IOMUX pinctrl pins
>> + */
>> +static const struct cygnus_gpio_pin_range cygnus_gpio_pintable[] = {
>> +	CYGNUS_PINRANGE(0, 42, 1),
>> +	CYGNUS_PINRANGE(1, 44, 3),
>> +	CYGNUS_PINRANGE(4, 48, 1),
>> +	CYGNUS_PINRANGE(5, 50, 3),
>> +	CYGNUS_PINRANGE(8, 126, 1),
>> +	CYGNUS_PINRANGE(9, 155, 1),
>> +	CYGNUS_PINRANGE(10, 152, 1),
>> +	CYGNUS_PINRANGE(11, 154, 1),
>> +	CYGNUS_PINRANGE(12, 153, 1),
>> +	CYGNUS_PINRANGE(13, 127, 3),
>> +	CYGNUS_PINRANGE(16, 140, 1),
>> +	CYGNUS_PINRANGE(17, 145, 7),
>> +	CYGNUS_PINRANGE(24, 130, 10),
>> +	CYGNUS_PINRANGE(34, 141, 4),
>> +	CYGNUS_PINRANGE(38, 54, 1),
>> +	CYGNUS_PINRANGE(39, 56, 3),
>> +	CYGNUS_PINRANGE(42, 60, 3),
>> +	CYGNUS_PINRANGE(45, 64, 3),
>> +	CYGNUS_PINRANGE(48, 68, 2),
>> +	CYGNUS_PINRANGE(50, 84, 6),
>> +	CYGNUS_PINRANGE(56, 94, 6),
>> +	CYGNUS_PINRANGE(62, 72, 1),
>> +	CYGNUS_PINRANGE(63, 70, 1),
>> +	CYGNUS_PINRANGE(64, 80, 1),
>> +	CYGNUS_PINRANGE(65, 74, 3),
>> +	CYGNUS_PINRANGE(68, 78, 1),
>> +	CYGNUS_PINRANGE(69, 82, 1),
>> +	CYGNUS_PINRANGE(70, 156, 17),
>> +	CYGNUS_PINRANGE(87, 104, 12),
>> +	CYGNUS_PINRANGE(99, 102, 2),
>> +	CYGNUS_PINRANGE(101, 90, 4),
>> +	CYGNUS_PINRANGE(105, 116, 10),
>> +	CYGNUS_PINRANGE(123, 11, 1),
>> +	CYGNUS_PINRANGE(124, 38, 4),
>> +	CYGNUS_PINRANGE(128, 43, 1),
>> +	CYGNUS_PINRANGE(129, 47, 1),
>> +	CYGNUS_PINRANGE(130, 49, 1),
>> +	CYGNUS_PINRANGE(131, 53, 1),
>> +	CYGNUS_PINRANGE(132, 55, 1),
>> +	CYGNUS_PINRANGE(133, 59, 1),
>> +	CYGNUS_PINRANGE(134, 63, 1),
>> +	CYGNUS_PINRANGE(135, 67, 1),
>> +	CYGNUS_PINRANGE(136, 71, 1),
>> +	CYGNUS_PINRANGE(137, 73, 1),
>> +	CYGNUS_PINRANGE(138, 77, 1),
>> +	CYGNUS_PINRANGE(139, 79, 1),
>> +	CYGNUS_PINRANGE(140, 81, 1),
>> +	CYGNUS_PINRANGE(141, 83, 1),
>> +	CYGNUS_PINRANGE(142, 10, 1)
>> +};
>> +
>> +/*
>> + * The Cygnus IOMUX controller mainly supports group based mux configuration,
>> + * but certain pins can be muxed to GPIO individually. Only the ASIU GPIO
>> + * controller can support this, so it's an optional configuration
>> + *
>> + * Return -ENODEV means no support and that's fine
>> + */
>> +static int cygnus_gpio_pinmux_add_range(struct cygnus_gpio *chip)
>> +{
>> +	struct device_node *node = chip->dev->of_node;
>> +	struct device_node *pinmux_node;
>> +	struct platform_device *pinmux_pdev;
>> +	struct gpio_chip *gc = &chip->gc;
>> +	int i, ret;
>> +
>> +	/* parse DT to find the phandle to the pinmux controller */
>> +	pinmux_node = of_parse_phandle(node, "pinmux", 0);
>> +	if (!pinmux_node)
>> +		return -ENODEV;
>> +
>> +	pinmux_pdev = of_find_device_by_node(pinmux_node);
>> +	if (!pinmux_pdev) {
>> +		dev_err(chip->dev, "failed to get pinmux device\n");
>> +		return -EINVAL;
>> +	}
>> +
>> +	/* now need to create the mapping between local GPIO and PINMUX pins */
>> +	for (i = 0; i < ARRAY_SIZE(cygnus_gpio_pintable); i++) {
>> +		ret = gpiochip_add_pin_range(gc, dev_name(&pinmux_pdev->dev),
>> +					     cygnus_gpio_pintable[i].offset,
>> +					     cygnus_gpio_pintable[i].pin_base,
>> +					     cygnus_gpio_pintable[i].num_pins);
>> +		if (ret) {
>> +			dev_err(chip->dev, "unable to add GPIO pin range\n");
>> +			goto err_rm_pin_range;
>> +		}
>> +	}
>> +
>> +	chip->pinmux_is_supported = 1;
> 
> 	chip->pinmux_is_supported = true;
> 
> ?
> 
>> +	return 0;
>> +
>> +err_rm_pin_range:
>> +	gpiochip_remove_pin_ranges(gc);
> 
> I think you need:
> 
> 	put_dveice(&pinmux_pdev->dev);
> 
> since of_find_device_by_node calls bus_find_device() that takes
> reference to found device.
> 
> ... And now that I look at this majority of users of
> of_find_device_by_node() is broken like that :(
> 
> BTW, it looks like you only need pinmux_dev for it's name so you
> probably need to drop reference in success path as well.
> 
Oh wow! Really good to know. Will fix!

>> +	return ret;
>> +}
>> +
>> +static void cygnus_gpio_pinmux_remove_range(struct cygnus_gpio *chip)
>> +{
>> +	struct gpio_chip *gc = &chip->gc;
>> +
>> +	if (chip->pinmux_is_supported)
>> +		gpiochip_remove_pin_ranges(gc);
>> +}
>> +
>> +/*
>> + * Cygnus GPIO controller supports some PINCONF related configurations such as
>> + * pull up, pull down, and drive strength, when the pin is configured to GPIO
>> + *
>> + * Here a local pinctrl device is created with simple 1-to-1 pin mapping to the
>> + * local GPIO pins
>> + */
>> +static int cygnus_gpio_register_pinconf(struct cygnus_gpio *chip)
>> +{
>> +	struct pinctrl_desc *pctldesc = &chip->pctldesc;
>> +	struct pinctrl_pin_desc *pins;
>> +	struct gpio_chip *gc = &chip->gc;
>> +	int i, ret;
>> +
>> +	pins = devm_kcalloc(chip->dev, gc->ngpio, sizeof(*pins), GFP_KERNEL);
>> +	if (!pins)
>> +		return -ENOMEM;
>> +	chip->pins = pins;
>> +
>> +	for (i = 0; i < gc->ngpio; i++) {
>> +		pins[i].number = i;
>> +		pins[i].name = kasprintf(GFP_KERNEL, "gpio-%d", i);
> 
> We have devm_kasprintf().
> 
I was not aware of that. Okay I'll change to devm_kasprintf so I can get
rid of some memory free code below. Thanks!

>> +		if (!pins[i].name) {
>> +			ret = -ENOMEM;
>> +			goto err_kfree;
>> +		}
>> +	}
>> +
>> +	pctldesc->name = dev_name(chip->dev);
>> +	pctldesc->pctlops = &cygnus_pctrl_ops;
>> +	pctldesc->pins = pins;
>> +	pctldesc->npins = gc->ngpio;
>> +	pctldesc->confops = &cygnus_pconf_ops;
>> +
>> +	chip->pctl = pinctrl_register(pctldesc, chip->dev, chip);
>> +	if (!chip->pctl) {
>> +		dev_err(chip->dev, "unable to register pinctrl device\n");
>> +		ret = -EINVAL;
>> +		goto err_kfree;
>> +	}
>> +
>> +	return 0;
>> +
>> +err_kfree:
>> +	for (i = 0; i < gc->ngpio; i++)
>> +		kfree(pins[i].name);
>> +
>> +	return ret;
>> +}
>> +
>> +static void cygnus_gpio_unregister_pinconf(struct cygnus_gpio *chip)
>> +{
>> +	struct gpio_chip *gc = &chip->gc;
>> +	int i;
>> +
>> +	if (chip->pctl)
>> +		pinctrl_unregister(chip->pctl);
>> +
>> +	for (i = 0; i < gc->ngpio; i++)
>> +		kfree(chip->pins[i].name);
> 
> Should not be needed if you use devm_kasprintf.
> 
Yes!

>> +}
>> +
>> +static const struct of_device_id cygnus_gpio_of_match[] = {
>> +	{ .compatible = "brcm,cygnus-gpio" },
>> +	{ }
>> +};
>> +MODULE_DEVICE_TABLE(of, cygnus_gpio_of_match);
>> +
>> +static int cygnus_gpio_probe(struct platform_device *pdev)
>> +{
>> +	struct device *dev = &pdev->dev;
>> +	struct resource *res;
>> +	struct cygnus_gpio *chip;
>> +	struct gpio_chip *gc;
>> +	u32 ngpios;
>> +	int irq, ret;
>> +
>> +	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
>> +	if (!chip)
>> +		return -ENOMEM;
>> +
>> +	chip->dev = dev;
>> +	platform_set_drvdata(pdev, chip);
>> +
>> +	if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
>> +		dev_err(dev, "missing ngpios DT property\n");
>> +		return -ENODEV;
>> +	}
>> +	chip->num_banks = (ngpios + NGPIOS_PER_BANK - 1) / NGPIOS_PER_BANK;
>> +
>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +	chip->base = devm_ioremap_resource(dev, res);
>> +	if (IS_ERR(chip->base)) {
>> +		dev_err(dev, "unable to map I/O memory\n");
>> +		return PTR_ERR(chip->base);
>> +	}
>> +
>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
>> +	if (res) {
>> +		chip->io_ctrl = devm_ioremap_resource(dev, res);
>> +		if (IS_ERR(chip->io_ctrl)) {
>> +			dev_err(dev, "unable to map I/O memory\n");
>> +			return PTR_ERR(chip->io_ctrl);
>> +		}
>> +	}
>> +
>> +	spin_lock_init(&chip->lock);
>> +
>> +	gc = &chip->gc;
>> +	gc->base = -1;
>> +	gc->ngpio = ngpios;
>> +	gc->label = dev_name(dev);
>> +	gc->dev = dev;
>> +	gc->of_node = dev->of_node;
>> +	gc->request = cygnus_gpio_request;
>> +	gc->free = cygnus_gpio_free;
>> +	gc->direction_input = cygnus_gpio_direction_input;
>> +	gc->direction_output = cygnus_gpio_direction_output;
>> +	gc->set = cygnus_gpio_set;
>> +	gc->get = cygnus_gpio_get;
>> +
>> +	ret = gpiochip_add(gc);
>> +	if (ret < 0) {
>> +		dev_err(dev, "unable to add GPIO chip\n");
>> +		return ret;
>> +	}
>> +
>> +	ret = cygnus_gpio_pinmux_add_range(chip);
>> +	if (ret && ret != -ENODEV) {
>> +		dev_err(dev, "unable to add GPIO pin range\n");
>> +		goto err_rm_gpiochip;
>> +	}
>> +
>> +	ret = cygnus_gpio_register_pinconf(chip);
>> +	if (ret) {
>> +		dev_err(dev, "unable to register pinconf\n");
>> +		goto err_rm_range;
>> +	}
>> +
>> +	/* optional GPIO interrupt support */
>> +	irq = platform_get_irq(pdev, 0);
>> +	if (irq) {
>> +		ret = gpiochip_irqchip_add(gc, &cygnus_gpio_irq_chip, 0,
>> +					   handle_simple_irq, IRQ_TYPE_NONE);
>> +		if (ret) {
>> +			dev_err(dev, "no GPIO irqchip\n");
>> +			goto err_unregister_pinconf;
>> +		}
>> +
>> +		gpiochip_set_chained_irqchip(gc, &cygnus_gpio_irq_chip, irq,
>> +					     cygnus_gpio_irq_handler);
>> +	}
>> +
>> +	return 0;
>> +
>> +err_unregister_pinconf:
>> +	cygnus_gpio_unregister_pinconf(chip);
>> +
>> +err_rm_range:
>> +	cygnus_gpio_pinmux_remove_range(chip);
>> +
>> +err_rm_gpiochip:
>> +	gpiochip_remove(gc);
>> +
>> +	return ret;
>> +}
>> +
>> +static struct platform_driver cygnus_gpio_driver = {
>> +	.driver = {
>> +		.name = "cygnus-gpio",
>> +		.of_match_table = cygnus_gpio_of_match,
>> +	},
>> +	.probe = cygnus_gpio_probe,
> 
> The same comment about suppress_bind_attrs.
> 
Okay. Will do!

>> +};
>> +
>> +static int __init cygnus_gpio_init(void)
>> +{
>> +	return platform_driver_probe(&cygnus_gpio_driver, cygnus_gpio_probe);
>> +}
>> +arch_initcall_sync(cygnus_gpio_init);
>> +
>> +MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
>> +MODULE_DESCRIPTION("Broadcom Cygnus GPIO Driver");
>> +MODULE_LICENSE("GPL v2");
>> -- 
>> 1.7.9.5
>>
> 
> Thanks.
> 
Thanks for the review, Dmitry!

Ray

Re: [PATCH v7 2/4] pinctrl: cygnus: add gpio/pinconf driver

[Ray Jui]

On 2/3/2015 5:41 PM, Dmitry Torokhov wrote:
> On Tue, Feb 03, 2015 at 05:09:06PM -0800, Ray Jui wrote:
>> This adds the initial support of the Broadcom Cygnus GPIO/PINCONF driver
>> that supports all 3 GPIO controllers on Cygnus including the ASIU GPIO
>> controller, the chipCommonG GPIO controller, and the always-on GPIO
>> controller. Basic PINCONF configurations such as bias pull up/down, and
>> drive strength are also supported in this driver.
>>
>> Pins from the ASIU GPIO controller can be individually muxed to GPIO
>> function, through interaction with the Cygnus IOMUX controller
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>> ---
>>  drivers/pinctrl/bcm/Kconfig               |   22 +
>>  drivers/pinctrl/bcm/Makefile              |    1 +
>>  drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c |  920 +++++++++++++++++++++++++++++
>>  3 files changed, 943 insertions(+)
>>  create mode 100644 drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c
>>
>> diff --git a/drivers/pinctrl/bcm/Kconfig b/drivers/pinctrl/bcm/Kconfig
>> index eb13201..cd11d4d 100644
>> --- a/drivers/pinctrl/bcm/Kconfig
>> +++ b/drivers/pinctrl/bcm/Kconfig
>> @@ -20,6 +20,28 @@ config PINCTRL_BCM2835
>>  	select PINMUX
>>  	select PINCONF
>>  
>> +config PINCTRL_CYGNUS_GPIO
>> +	bool "Broadcom Cygnus GPIO (with PINCONF) driver"
>> +	depends on OF_GPIO && ARCH_BCM_CYGNUS
>> +	select GPIOLIB_IRQCHIP
>> +	select PINCONF
>> +	select GENERIC_PINCONF
>> +	default ARCH_BCM_CYGNUS
>> +	help
>> +	  Say yes here to enable the Broadcom Cygnus GPIO driver.
>> +
>> +	  The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
>> +	  GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
>> +	  the always-ON GPIO controller (CRMU/AON). All 3 GPIO controllers are
>> +	  supported by this driver.
>> +
>> +	  All 3 Cygnus GPIO controllers support basic PINCONF functions such
>> +	  as bias pull up, pull down, and drive strength configurations, when
>> +	  these pins are muxed to GPIO.
>> +
>> +	  Pins from the ASIU GPIO can be individually muxed to GPIO function,
>> +	  through interaction with the Cygnus IOMUX controller.
>> +
>>  config PINCTRL_CYGNUS_MUX
>>  	bool "Broadcom Cygnus IOMUX driver"
>>  	depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
>> diff --git a/drivers/pinctrl/bcm/Makefile b/drivers/pinctrl/bcm/Makefile
>> index bb6beb6..2b2f70e 100644
>> --- a/drivers/pinctrl/bcm/Makefile
>> +++ b/drivers/pinctrl/bcm/Makefile
>> @@ -2,4 +2,5 @@
>>  
>>  obj-$(CONFIG_PINCTRL_BCM281XX)		+= pinctrl-bcm281xx.o
>>  obj-$(CONFIG_PINCTRL_BCM2835)		+= pinctrl-bcm2835.o
>> +obj-$(CONFIG_PINCTRL_CYGNUS_GPIO)	+= pinctrl-cygnus-gpio.o
>>  obj-$(CONFIG_PINCTRL_CYGNUS_MUX)	+= pinctrl-cygnus-mux.o
>> diff --git a/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c b/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c
>> new file mode 100644
>> index 0000000..cfe4478
>> --- /dev/null
>> +++ b/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c
>> @@ -0,0 +1,920 @@
>> +/*
>> + * Copyright (C) 2014-2015 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + *
>> + * This file contains the Broadcom Cygnus GPIO driver that supports 3
>> + * GPIO controllers on Cygnus including the ASIU GPIO controller, the
>> + * chipCommonG GPIO controller, and the always-on GPIO controller. Basic
>> + * PINCONF such as bias pull up/down, and drive strength are also supported
>> + * in this driver.
>> + *
>> + * Pins from the ASIU GPIO can be individually muxed to GPIO function,
>> + * through the interaction with the Cygnus IOMUX controller
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/slab.h>
>> +#include <linux/module.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/io.h>
>> +#include <linux/gpio.h>
>> +#include <linux/ioport.h>
>> +#include <linux/of_device.h>
>> +#include <linux/of_irq.h>
>> +#include <linux/pinctrl/pinctrl.h>
>> +#include <linux/pinctrl/pinmux.h>
>> +#include <linux/pinctrl/pinconf.h>
>> +#include <linux/pinctrl/pinconf-generic.h>
>> +
>> +#include "../pinctrl-utils.h"
>> +
>> +#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
>> +#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
>> +#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
>> +#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
>> +#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
>> +#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
>> +#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
>> +#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
>> +#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
>> +#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
>> +#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
>> +#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
>> +
>> +/* drive strength control for ASIU GPIO */
>> +#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
>> +
>> +/* drive strength control for CCM/CRMU (AON) GPIO */
>> +#define CYGNUS_GPIO_DRV0_CTRL_OFFSET  0x00
>> +
>> +#define GPIO_BANK_SIZE 0x200
>> +#define NGPIOS_PER_BANK 32
>> +#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
>> +
>> +#define CYGNUS_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + (reg))
>> +#define CYGNUS_GPIO_SHIFT(pin) ((pin) % NGPIOS_PER_BANK)
>> +
>> +#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
>> +#define GPIO_DRV_STRENGTH_BITS       3
>> +#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
>> +
>> +/*
>> + * Cygnus GPIO core
>> + *
>> + * @dev: pointer to device
>> + * @base: I/O register base for Cygnus GPIO controller
>> + * @io_ctrl: I/O register base for certain type of Cygnus GPIO controller that
>> + * has the PINCONF support implemented outside of the GPIO block
>> + * @lock: lock to protect access to I/O registers
>> + * @gc: GPIO chip
>> + * @num_banks: number of GPIO banks, each bank supports up to 32 GPIOs
>> + * @pinmux_is_supported: flag to indicate this GPIO controller contains pins
>> + * that can be individually muxed to GPIO
>> + * @pctl: pointer to pinctrl_dev
>> + * @pctldesc: pinctrl descriptor
>> + * @pins: pointer to array of pins
>> + */
>> +struct cygnus_gpio {
>> +	struct device *dev;
>> +
>> +	void __iomem *base;
>> +	void __iomem *io_ctrl;
>> +
>> +	spinlock_t lock;
>> +
>> +	struct gpio_chip gc;
>> +	unsigned num_banks;
>> +
>> +	int pinmux_is_supported;
> 
> bool?
> 
Yes. Will do.

>> +
>> +	struct pinctrl_dev *pctl;
>> +	struct pinctrl_desc pctldesc;
>> +	struct pinctrl_pin_desc *pins;
>> +};
>> +
>> +static struct cygnus_gpio *to_cygnus_gpio(struct gpio_chip *gc)
>> +{
>> +	return container_of(gc, struct cygnus_gpio, gc);
>> +}
>> +
>> +/*
>> + * Mapping from PINCONF pins to GPIO pins is 1-to-1
>> + */
>> +static unsigned cygnus_pin_to_gpio(unsigned pin)
>> +{
>> +	return pin;
>> +}
>> +
>> +static u32 cygnus_readl(struct cygnus_gpio *chip, unsigned int offset)
>> +{
>> +	return readl(chip->base + offset);
>> +}
>> +
>> +static void cygnus_writel(struct cygnus_gpio *chip, unsigned int offset,
>> +			  u32 val)
>> +{
>> +	writel(val, chip->base + offset);
>> +}
>> +
>> +/**
>> + *  cygnus_set_bit - set or clear one bit (corresponding to the GPIO pin) in a
>> + *  Cygnus GPIO register
>> + *
>> + *  @cygnus_gpio: Cygnus GPIO device
>> + *  @reg: register offset
>> + *  @gpio: GPIO pin
>> + *  @set: set or clear. 1 - set; 0 -clear
>> + */
>> +static void cygnus_set_bit(struct cygnus_gpio *chip, unsigned int reg,
>> +			   unsigned gpio, int set)
>> +{
>> +	unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
>> +	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
>> +	u32 val;
>> +
>> +	val = cygnus_readl(chip, offset);
>> +	if (set)
>> +		val |= BIT(shift);
>> +	else
>> +		val &= ~BIT(shift);
>> +	cygnus_writel(chip, offset, val);
>> +}
>> +
>> +static int cygnus_get_bit(struct cygnus_gpio *chip, unsigned int reg,
>> +			  unsigned gpio)
>> +{
>> +	unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
>> +	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
>> +	u32 val;
>> +
>> +	val = cygnus_readl(chip, offset) & BIT(shift);
>> +	if (val)
>> +		return 1;
>> +	else
>> +		return 0;
>> +}
>> +
>> +static void cygnus_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
>> +{
>> +	struct gpio_chip *gc = irq_desc_get_handler_data(desc);
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	struct irq_chip *irq_chip = irq_desc_get_chip(desc);
>> +	int i, bit;
>> +
>> +	chained_irq_enter(irq_chip, desc);
>> +
>> +	/* go through the entire GPIO banks and handle all interrupts */
>> +	for (i = 0; i < chip->num_banks; i++) {
>> +		unsigned long val = cygnus_readl(chip,
>> +				(i * GPIO_BANK_SIZE) +
>> +				CYGNUS_GPIO_INT_MSTAT_OFFSET);
>> +
>> +		for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
>> +			unsigned pin = NGPIOS_PER_BANK * i + bit;
>> +			int child_irq = irq_find_mapping(gc->irqdomain, pin);
>> +
>> +			/*
>> +			 * Clear the interrupt before invoking the
>> +			 * handler, so we do not leave any window
>> +			 */
>> +			cygnus_writel(chip, (i * GPIO_BANK_SIZE) +
>> +				      CYGNUS_GPIO_INT_CLR_OFFSET, BIT(bit));
>> +
>> +			generic_handle_irq(child_irq);
>> +		}
>> +	}
>> +
>> +	chained_irq_exit(irq_chip, desc);
>> +}
>> +
>> +
>> +static void cygnus_gpio_irq_ack(struct irq_data *d)
>> +{
>> +	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	unsigned gpio = d->hwirq;
>> +	unsigned int offset = CYGNUS_GPIO_REG(gpio,
>> +			CYGNUS_GPIO_INT_CLR_OFFSET);
>> +	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
>> +	u32 val = BIT(shift);
>> +
>> +	cygnus_writel(chip, offset, val);
>> +}
>> +
>> +/**
>> + *  cygnus_gpio_irq_set_mask - mask/unmask a GPIO interrupt
>> + *
>> + *  @d: IRQ chip data
>> + *  @mask: mask/unmask GPIO interrupt. 0 - mask (disable); 1 - unmask (enable)
>> + */
>> +static void cygnus_gpio_irq_set_mask(struct irq_data *d, int mask)
>> +{
>> +	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	unsigned gpio = d->hwirq;
>> +
>> +	cygnus_set_bit(chip, CYGNUS_GPIO_INT_MSK_OFFSET, gpio, mask);
>> +}
>> +
>> +static void cygnus_gpio_irq_mask(struct irq_data *d)
>> +{
>> +	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	unsigned long flags;
>> +
>> +	spin_lock_irqsave(&chip->lock, flags);
>> +	cygnus_gpio_irq_set_mask(d, 0);
>> +	spin_unlock_irqrestore(&chip->lock, flags);
>> +}
>> +
>> +static void cygnus_gpio_irq_unmask(struct irq_data *d)
>> +{
>> +	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	unsigned long flags;
>> +
>> +	spin_lock_irqsave(&chip->lock, flags);
>> +	cygnus_gpio_irq_set_mask(d, 1);
>> +	spin_unlock_irqrestore(&chip->lock, flags);
>> +}
>> +
>> +static int cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
>> +{
>> +	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	unsigned gpio = d->hwirq;
>> +	int int_type = 0, dual_edge = 0, edge_lvl = 0;
>> +	unsigned long flags;
>> +
>> +	switch (type & IRQ_TYPE_SENSE_MASK) {
>> +	case IRQ_TYPE_EDGE_RISING:
>> +		edge_lvl = 1;
>> +		break;
>> +
>> +	case IRQ_TYPE_EDGE_FALLING:
>> +		break;
>> +
>> +	case IRQ_TYPE_EDGE_BOTH:
>> +		dual_edge = 1;
>> +		break;
>> +
>> +	case IRQ_TYPE_LEVEL_HIGH:
>> +		int_type = 1;
>> +		edge_lvl = 1;
>> +		break;
>> +
>> +	case IRQ_TYPE_LEVEL_LOW:
>> +		int_type = 1;
>> +		break;
>> +
>> +	default:
>> +		dev_err(chip->dev, "invalid GPIO IRQ type 0x%x\n",
>> +			type);
>> +		return -EINVAL;
>> +	}
>> +
>> +	spin_lock_irqsave(&chip->lock, flags);
>> +	cygnus_set_bit(chip, CYGNUS_GPIO_IN_TYPE_OFFSET, gpio, int_type);
>> +	cygnus_set_bit(chip, CYGNUS_GPIO_INT_DE_OFFSET, gpio, dual_edge);
>> +	cygnus_set_bit(chip, CYGNUS_GPIO_INT_EDGE_OFFSET, gpio,
>> +		       edge_lvl);
>> +	spin_unlock_irqrestore(&chip->lock, flags);
>> +
>> +	dev_dbg(chip->dev,
>> +		"gpio:%u set int_type:%d dual_edge:%d edge_lvl:%d\n",
>> +		gpio, int_type, dual_edge, edge_lvl);
>> +
>> +	return 0;
>> +}
>> +
>> +static struct irq_chip cygnus_gpio_irq_chip = {
>> +	.name = "bcm-cygnus-gpio",
>> +	.irq_ack = cygnus_gpio_irq_ack,
>> +	.irq_mask = cygnus_gpio_irq_mask,
>> +	.irq_unmask = cygnus_gpio_irq_unmask,
>> +	.irq_set_type = cygnus_gpio_irq_set_type,
>> +};
>> +
>> +/*
>> + * Request the Cygnus IOMUX pinmux controller to mux individual pins to GPIO
>> + */
>> +static int cygnus_gpio_request(struct gpio_chip *gc, unsigned offset)
>> +{
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	unsigned gpio = gc->base + offset;
>> +
>> +	/* not all Cygnus GPIO pins can be muxed individually */
>> +	if (!chip->pinmux_is_supported)
>> +		return 0;
>> +
>> +	return pinctrl_request_gpio(gpio);
>> +}
>> +
>> +static void cygnus_gpio_free(struct gpio_chip *gc, unsigned offset)
>> +{
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	unsigned gpio = gc->base + offset;
>> +
>> +	if (!chip->pinmux_is_supported)
>> +		return;
>> +
>> +	pinctrl_free_gpio(gpio);
>> +}
>> +
>> +static int cygnus_gpio_direction_input(struct gpio_chip *gc, unsigned gpio)
>> +{
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	unsigned long flags;
>> +
>> +	spin_lock_irqsave(&chip->lock, flags);
>> +	cygnus_set_bit(chip, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 0);
>> +	spin_unlock_irqrestore(&chip->lock, flags);
>> +
>> +	dev_dbg(chip->dev, "gpio:%u set input\n", gpio);
>> +
>> +	return 0;
>> +}
>> +
>> +static int cygnus_gpio_direction_output(struct gpio_chip *gc, unsigned gpio,
>> +					int value)
>> +{
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	unsigned long flags;
>> +
>> +	spin_lock_irqsave(&chip->lock, flags);
>> +	cygnus_set_bit(chip, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 1);
>> +	cygnus_set_bit(chip, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
>> +	spin_unlock_irqrestore(&chip->lock, flags);
>> +
>> +	dev_dbg(chip->dev, "gpio:%u set output, value:%d\n", gpio, value);
>> +
>> +	return 0;
>> +}
>> +
>> +static void cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio, int value)
>> +{
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	unsigned long flags;
>> +
>> +	spin_lock_irqsave(&chip->lock, flags);
>> +	cygnus_set_bit(chip, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
>> +	spin_unlock_irqrestore(&chip->lock, flags);
>> +
>> +	dev_dbg(chip->dev, "gpio:%u set, value:%d\n", gpio, value);
>> +}
>> +
>> +static int cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
>> +{
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	unsigned int offset = CYGNUS_GPIO_REG(gpio,
>> +					      CYGNUS_GPIO_DATA_IN_OFFSET);
>> +	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
>> +
>> +	return !!(cygnus_readl(chip, offset) & BIT(shift));
>> +}
>> +
>> +static int cygnus_get_groups_count(struct pinctrl_dev *pctldev)
>> +{
>> +	return 1;
>> +}
>> +
>> +/*
>> + * Only one group: "gpio_grp", since this local pinctrl device only performs
>> + * GPIO specific PINCONF configurations
>> + */
>> +static const char *cygnus_get_group_name(struct pinctrl_dev *pctldev,
>> +					 unsigned selector)
>> +{
>> +
> 
> Extra blank line.
> 
Thanks!

>> +	return "gpio_grp";
>> +}
>> +
>> +static const struct pinctrl_ops cygnus_pctrl_ops = {
>> +	.get_groups_count = cygnus_get_groups_count,
>> +	.get_group_name = cygnus_get_group_name,
>> +	.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
>> +	.dt_free_map = pinctrl_utils_dt_free_map,
>> +};
>> +
>> +static int cygnus_gpio_set_pull(struct cygnus_gpio *chip, unsigned gpio,
>> +				int disable, int pull_up)
>> +{
>> +	unsigned long flags;
>> +
>> +	spin_lock_irqsave(&chip->lock, flags);
>> +
>> +	if (disable) {
>> +		cygnus_set_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio, 0);
>> +	} else {
>> +		cygnus_set_bit(chip, CYGNUS_GPIO_PAD_RES_OFFSET, gpio,
>> +			       pull_up);
>> +		cygnus_set_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio, 1);
>> +	}
>> +
>> +	spin_unlock_irqrestore(&chip->lock, flags);
>> +
>> +	dev_dbg(chip->dev, "gpio:%u set pullup:%d\n", gpio, pull_up);
>> +
>> +	return 0;
>> +}
>> +
>> +static void cygnus_gpio_get_pull(struct cygnus_gpio *chip, unsigned gpio,
>> +				 int *disable, int *pull_up)
>> +{
>> +	unsigned long flags;
>> +
>> +	spin_lock_irqsave(&chip->lock, flags);
>> +	*disable = !cygnus_get_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio);
>> +	*pull_up = cygnus_get_bit(chip, CYGNUS_GPIO_PAD_RES_OFFSET, gpio);
>> +	spin_unlock_irqrestore(&chip->lock, flags);
>> +}
>> +
>> +static int cygnus_gpio_set_strength(struct cygnus_gpio *chip, unsigned gpio,
>> +				    unsigned strength)
>> +{
>> +	void __iomem *base;
>> +	unsigned int i, offset, shift;
>> +	u32 val;
>> +	unsigned long flags;
>> +
>> +	/* make sure drive strength is supported */
>> +	if (strength < 2 ||  strength > 16 || (strength % 2))
>> +		return -ENOTSUPP;
>> +
>> +	if (chip->io_ctrl) {
>> +		base = chip->io_ctrl;
>> +		offset = CYGNUS_GPIO_DRV0_CTRL_OFFSET;
>> +	} else {
>> +		base = chip->base;
>> +		offset = CYGNUS_GPIO_REG(gpio,
>> +					 CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET);
>> +	}
>> +
>> +	shift = CYGNUS_GPIO_SHIFT(gpio);
>> +
>> +	dev_dbg(chip->dev, "gpio:%u set drive strength:%d mA\n", gpio,
>> +		strength);
>> +
>> +	spin_lock_irqsave(&chip->lock, flags);
>> +	strength = (strength / 2) - 1;
>> +	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
>> +		val = readl(base + offset);
>> +		val &= ~BIT(shift);
>> +		val |= ((strength >> i) & 0x1) << shift;
>> +		writel(val, base + offset);
>> +		offset += 4;
>> +	}
>> +	spin_unlock_irqrestore(&chip->lock, flags);
>> +
>> +	return 0;
>> +}
>> +
>> +static int cygnus_gpio_get_strength(struct cygnus_gpio *chip, unsigned gpio,
>> +				    u16 *strength)
>> +{
>> +	void __iomem *base;
>> +	unsigned int i, offset, shift;
>> +	u32 val;
>> +	unsigned long flags;
>> +
>> +	if (chip->io_ctrl) {
>> +		base = chip->io_ctrl;
>> +		offset = CYGNUS_GPIO_DRV0_CTRL_OFFSET;
>> +	} else {
>> +		base = chip->base;
>> +		offset = CYGNUS_GPIO_REG(gpio,
>> +					 CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET);
>> +	}
>> +
>> +	shift = CYGNUS_GPIO_SHIFT(gpio);
>> +
>> +	spin_lock_irqsave(&chip->lock, flags);
>> +	*strength = 0;
>> +	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
>> +		val = readl(base + offset) & BIT(shift);
>> +		val >>= shift;
>> +		*strength += (val << i);
>> +		offset += 4;
>> +	}
>> +
>> +	/* convert to mA */
>> +	*strength = (*strength + 1) * 2;
>> +	spin_unlock_irqrestore(&chip->lock, flags);
>> +
>> +	return 0;
>> +}
>> +
>> +static int cygnus_pin_config_get(struct pinctrl_dev *pctldev, unsigned pin,
>> +				 unsigned long *config)
>> +{
>> +	struct cygnus_gpio *chip = pinctrl_dev_get_drvdata(pctldev);
>> +	enum pin_config_param param = pinconf_to_config_param(*config);
>> +	unsigned gpio = cygnus_pin_to_gpio(pin);
>> +	u16 arg;
>> +	int disable, pull_up, ret;
>> +
>> +	switch (param) {
>> +	case PIN_CONFIG_BIAS_DISABLE:
>> +		cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
>> +		if (disable)
>> +			return 0;
>> +		else
>> +			return -EINVAL;
>> +
>> +	case PIN_CONFIG_BIAS_PULL_UP:
>> +		cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
>> +		if (!disable && pull_up)
>> +			return 0;
>> +		else
>> +			return -EINVAL;
>> +
>> +	case PIN_CONFIG_BIAS_PULL_DOWN:
>> +		cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
>> +		if (!disable && !pull_up)
>> +			return 0;
>> +		else
>> +			return -EINVAL;
>> +
>> +	case PIN_CONFIG_DRIVE_STRENGTH:
>> +		ret = cygnus_gpio_get_strength(chip, gpio, &arg);
>> +		if (ret)
>> +			return ret;
>> +		else
>> +			*config = pinconf_to_config_packed(param, arg);
>> +
>> +		return 0;
>> +
>> +	default:
>> +		return -ENOTSUPP;
>> +	}
>> +
>> +	return -ENOTSUPP;
>> +}
>> +
>> +static int cygnus_pin_config_set(struct pinctrl_dev *pctldev, unsigned pin,
>> +				 unsigned long *configs, unsigned num_configs)
>> +{
>> +	struct cygnus_gpio *chip = pinctrl_dev_get_drvdata(pctldev);
>> +	enum pin_config_param param;
>> +	u16 arg;
>> +	unsigned i, gpio = cygnus_pin_to_gpio(pin);
>> +	int ret = -ENOTSUPP;
>> +
>> +	for (i = 0; i < num_configs; i++) {
>> +		param = pinconf_to_config_param(configs[i]);
>> +		arg = pinconf_to_config_argument(configs[i]);
>> +
>> +		switch (param) {
>> +		case PIN_CONFIG_BIAS_DISABLE:
>> +			ret = cygnus_gpio_set_pull(chip, gpio, 1, 0);
>> +			if (ret < 0)
>> +				goto out;
>> +			break;
>> +
>> +		case PIN_CONFIG_BIAS_PULL_UP:
>> +			ret = cygnus_gpio_set_pull(chip, gpio, 0, 1);
>> +			if (ret < 0)
>> +				goto out;
>> +			break;
>> +
>> +		case PIN_CONFIG_BIAS_PULL_DOWN:
>> +			ret = cygnus_gpio_set_pull(chip, gpio, 0, 0);
>> +			if (ret < 0)
>> +				goto out;
>> +			break;
>> +
>> +		case PIN_CONFIG_DRIVE_STRENGTH:
>> +			ret = cygnus_gpio_set_strength(chip, gpio, arg);
>> +			if (ret < 0)
>> +				goto out;
>> +			break;
>> +
>> +		default:
>> +			dev_err(chip->dev, "invalid configuration\n");
>> +			return -ENOTSUPP;
>> +		}
>> +	} /* for each config */
>> +
>> +out:
>> +	return ret;
>> +}
>> +
>> +static const struct pinconf_ops cygnus_pconf_ops = {
>> +	.is_generic = true,
>> +	.pin_config_get = cygnus_pin_config_get,
>> +	.pin_config_set = cygnus_pin_config_set,
>> +};
>> +
>> +/*
>> + * Map a GPIO in the local gpio_chip pin space to a pin in the Cygnus IOMUX
>> + * pinctrl pin space
>> + */
>> +struct cygnus_gpio_pin_range {
>> +	unsigned offset;
>> +	unsigned pin_base;
>> +	unsigned num_pins;
>> +};
>> +
>> +#define CYGNUS_PINRANGE(o, p, n) { .offset = o, .pin_base = p, .num_pins = n }
>> +
>> +/*
>> + * Pin mapping table for mapping local GPIO pins to Cygnus IOMUX pinctrl pins
>> + */
>> +static const struct cygnus_gpio_pin_range cygnus_gpio_pintable[] = {
>> +	CYGNUS_PINRANGE(0, 42, 1),
>> +	CYGNUS_PINRANGE(1, 44, 3),
>> +	CYGNUS_PINRANGE(4, 48, 1),
>> +	CYGNUS_PINRANGE(5, 50, 3),
>> +	CYGNUS_PINRANGE(8, 126, 1),
>> +	CYGNUS_PINRANGE(9, 155, 1),
>> +	CYGNUS_PINRANGE(10, 152, 1),
>> +	CYGNUS_PINRANGE(11, 154, 1),
>> +	CYGNUS_PINRANGE(12, 153, 1),
>> +	CYGNUS_PINRANGE(13, 127, 3),
>> +	CYGNUS_PINRANGE(16, 140, 1),
>> +	CYGNUS_PINRANGE(17, 145, 7),
>> +	CYGNUS_PINRANGE(24, 130, 10),
>> +	CYGNUS_PINRANGE(34, 141, 4),
>> +	CYGNUS_PINRANGE(38, 54, 1),
>> +	CYGNUS_PINRANGE(39, 56, 3),
>> +	CYGNUS_PINRANGE(42, 60, 3),
>> +	CYGNUS_PINRANGE(45, 64, 3),
>> +	CYGNUS_PINRANGE(48, 68, 2),
>> +	CYGNUS_PINRANGE(50, 84, 6),
>> +	CYGNUS_PINRANGE(56, 94, 6),
>> +	CYGNUS_PINRANGE(62, 72, 1),
>> +	CYGNUS_PINRANGE(63, 70, 1),
>> +	CYGNUS_PINRANGE(64, 80, 1),
>> +	CYGNUS_PINRANGE(65, 74, 3),
>> +	CYGNUS_PINRANGE(68, 78, 1),
>> +	CYGNUS_PINRANGE(69, 82, 1),
>> +	CYGNUS_PINRANGE(70, 156, 17),
>> +	CYGNUS_PINRANGE(87, 104, 12),
>> +	CYGNUS_PINRANGE(99, 102, 2),
>> +	CYGNUS_PINRANGE(101, 90, 4),
>> +	CYGNUS_PINRANGE(105, 116, 10),
>> +	CYGNUS_PINRANGE(123, 11, 1),
>> +	CYGNUS_PINRANGE(124, 38, 4),
>> +	CYGNUS_PINRANGE(128, 43, 1),
>> +	CYGNUS_PINRANGE(129, 47, 1),
>> +	CYGNUS_PINRANGE(130, 49, 1),
>> +	CYGNUS_PINRANGE(131, 53, 1),
>> +	CYGNUS_PINRANGE(132, 55, 1),
>> +	CYGNUS_PINRANGE(133, 59, 1),
>> +	CYGNUS_PINRANGE(134, 63, 1),
>> +	CYGNUS_PINRANGE(135, 67, 1),
>> +	CYGNUS_PINRANGE(136, 71, 1),
>> +	CYGNUS_PINRANGE(137, 73, 1),
>> +	CYGNUS_PINRANGE(138, 77, 1),
>> +	CYGNUS_PINRANGE(139, 79, 1),
>> +	CYGNUS_PINRANGE(140, 81, 1),
>> +	CYGNUS_PINRANGE(141, 83, 1),
>> +	CYGNUS_PINRANGE(142, 10, 1)
>> +};
>> +
>> +/*
>> + * The Cygnus IOMUX controller mainly supports group based mux configuration,
>> + * but certain pins can be muxed to GPIO individually. Only the ASIU GPIO
>> + * controller can support this, so it's an optional configuration
>> + *
>> + * Return -ENODEV means no support and that's fine
>> + */
>> +static int cygnus_gpio_pinmux_add_range(struct cygnus_gpio *chip)
>> +{
>> +	struct device_node *node = chip->dev->of_node;
>> +	struct device_node *pinmux_node;
>> +	struct platform_device *pinmux_pdev;
>> +	struct gpio_chip *gc = &chip->gc;
>> +	int i, ret;
>> +
>> +	/* parse DT to find the phandle to the pinmux controller */
>> +	pinmux_node = of_parse_phandle(node, "pinmux", 0);
>> +	if (!pinmux_node)
>> +		return -ENODEV;
>> +
>> +	pinmux_pdev = of_find_device_by_node(pinmux_node);
>> +	if (!pinmux_pdev) {
>> +		dev_err(chip->dev, "failed to get pinmux device\n");
>> +		return -EINVAL;
>> +	}
>> +
>> +	/* now need to create the mapping between local GPIO and PINMUX pins */
>> +	for (i = 0; i < ARRAY_SIZE(cygnus_gpio_pintable); i++) {
>> +		ret = gpiochip_add_pin_range(gc, dev_name(&pinmux_pdev->dev),
>> +					     cygnus_gpio_pintable[i].offset,
>> +					     cygnus_gpio_pintable[i].pin_base,
>> +					     cygnus_gpio_pintable[i].num_pins);
>> +		if (ret) {
>> +			dev_err(chip->dev, "unable to add GPIO pin range\n");
>> +			goto err_rm_pin_range;
>> +		}
>> +	}
>> +
>> +	chip->pinmux_is_supported = 1;
> 
> 	chip->pinmux_is_supported = true;
> 
> ?
> 
>> +	return 0;
>> +
>> +err_rm_pin_range:
>> +	gpiochip_remove_pin_ranges(gc);
> 
> I think you need:
> 
> 	put_dveice(&pinmux_pdev->dev);
> 
> since of_find_device_by_node calls bus_find_device() that takes
> reference to found device.
> 
> ... And now that I look at this majority of users of
> of_find_device_by_node() is broken like that :(
> 
> BTW, it looks like you only need pinmux_dev for it's name so you
> probably need to drop reference in success path as well.
> 
Oh wow! Really good to know. Will fix!

>> +	return ret;
>> +}
>> +
>> +static void cygnus_gpio_pinmux_remove_range(struct cygnus_gpio *chip)
>> +{
>> +	struct gpio_chip *gc = &chip->gc;
>> +
>> +	if (chip->pinmux_is_supported)
>> +		gpiochip_remove_pin_ranges(gc);
>> +}
>> +
>> +/*
>> + * Cygnus GPIO controller supports some PINCONF related configurations such as
>> + * pull up, pull down, and drive strength, when the pin is configured to GPIO
>> + *
>> + * Here a local pinctrl device is created with simple 1-to-1 pin mapping to the
>> + * local GPIO pins
>> + */
>> +static int cygnus_gpio_register_pinconf(struct cygnus_gpio *chip)
>> +{
>> +	struct pinctrl_desc *pctldesc = &chip->pctldesc;
>> +	struct pinctrl_pin_desc *pins;
>> +	struct gpio_chip *gc = &chip->gc;
>> +	int i, ret;
>> +
>> +	pins = devm_kcalloc(chip->dev, gc->ngpio, sizeof(*pins), GFP_KERNEL);
>> +	if (!pins)
>> +		return -ENOMEM;
>> +	chip->pins = pins;
>> +
>> +	for (i = 0; i < gc->ngpio; i++) {
>> +		pins[i].number = i;
>> +		pins[i].name = kasprintf(GFP_KERNEL, "gpio-%d", i);
> 
> We have devm_kasprintf().
> 
I was not aware of that. Okay I'll change to devm_kasprintf so I can get
rid of some memory free code below. Thanks!

>> +		if (!pins[i].name) {
>> +			ret = -ENOMEM;
>> +			goto err_kfree;
>> +		}
>> +	}
>> +
>> +	pctldesc->name = dev_name(chip->dev);
>> +	pctldesc->pctlops = &cygnus_pctrl_ops;
>> +	pctldesc->pins = pins;
>> +	pctldesc->npins = gc->ngpio;
>> +	pctldesc->confops = &cygnus_pconf_ops;
>> +
>> +	chip->pctl = pinctrl_register(pctldesc, chip->dev, chip);
>> +	if (!chip->pctl) {
>> +		dev_err(chip->dev, "unable to register pinctrl device\n");
>> +		ret = -EINVAL;
>> +		goto err_kfree;
>> +	}
>> +
>> +	return 0;
>> +
>> +err_kfree:
>> +	for (i = 0; i < gc->ngpio; i++)
>> +		kfree(pins[i].name);
>> +
>> +	return ret;
>> +}
>> +
>> +static void cygnus_gpio_unregister_pinconf(struct cygnus_gpio *chip)
>> +{
>> +	struct gpio_chip *gc = &chip->gc;
>> +	int i;
>> +
>> +	if (chip->pctl)
>> +		pinctrl_unregister(chip->pctl);
>> +
>> +	for (i = 0; i < gc->ngpio; i++)
>> +		kfree(chip->pins[i].name);
> 
> Should not be needed if you use devm_kasprintf.
> 
Yes!

>> +}
>> +
>> +static const struct of_device_id cygnus_gpio_of_match[] = {
>> +	{ .compatible = "brcm,cygnus-gpio" },
>> +	{ }
>> +};
>> +MODULE_DEVICE_TABLE(of, cygnus_gpio_of_match);
>> +
>> +static int cygnus_gpio_probe(struct platform_device *pdev)
>> +{
>> +	struct device *dev = &pdev->dev;
>> +	struct resource *res;
>> +	struct cygnus_gpio *chip;
>> +	struct gpio_chip *gc;
>> +	u32 ngpios;
>> +	int irq, ret;
>> +
>> +	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
>> +	if (!chip)
>> +		return -ENOMEM;
>> +
>> +	chip->dev = dev;
>> +	platform_set_drvdata(pdev, chip);
>> +
>> +	if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
>> +		dev_err(dev, "missing ngpios DT property\n");
>> +		return -ENODEV;
>> +	}
>> +	chip->num_banks = (ngpios + NGPIOS_PER_BANK - 1) / NGPIOS_PER_BANK;
>> +
>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +	chip->base = devm_ioremap_resource(dev, res);
>> +	if (IS_ERR(chip->base)) {
>> +		dev_err(dev, "unable to map I/O memory\n");
>> +		return PTR_ERR(chip->base);
>> +	}
>> +
>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
>> +	if (res) {
>> +		chip->io_ctrl = devm_ioremap_resource(dev, res);
>> +		if (IS_ERR(chip->io_ctrl)) {
>> +			dev_err(dev, "unable to map I/O memory\n");
>> +			return PTR_ERR(chip->io_ctrl);
>> +		}
>> +	}
>> +
>> +	spin_lock_init(&chip->lock);
>> +
>> +	gc = &chip->gc;
>> +	gc->base = -1;
>> +	gc->ngpio = ngpios;
>> +	gc->label = dev_name(dev);
>> +	gc->dev = dev;
>> +	gc->of_node = dev->of_node;
>> +	gc->request = cygnus_gpio_request;
>> +	gc->free = cygnus_gpio_free;
>> +	gc->direction_input = cygnus_gpio_direction_input;
>> +	gc->direction_output = cygnus_gpio_direction_output;
>> +	gc->set = cygnus_gpio_set;
>> +	gc->get = cygnus_gpio_get;
>> +
>> +	ret = gpiochip_add(gc);
>> +	if (ret < 0) {
>> +		dev_err(dev, "unable to add GPIO chip\n");
>> +		return ret;
>> +	}
>> +
>> +	ret = cygnus_gpio_pinmux_add_range(chip);
>> +	if (ret && ret != -ENODEV) {
>> +		dev_err(dev, "unable to add GPIO pin range\n");
>> +		goto err_rm_gpiochip;
>> +	}
>> +
>> +	ret = cygnus_gpio_register_pinconf(chip);
>> +	if (ret) {
>> +		dev_err(dev, "unable to register pinconf\n");
>> +		goto err_rm_range;
>> +	}
>> +
>> +	/* optional GPIO interrupt support */
>> +	irq = platform_get_irq(pdev, 0);
>> +	if (irq) {
>> +		ret = gpiochip_irqchip_add(gc, &cygnus_gpio_irq_chip, 0,
>> +					   handle_simple_irq, IRQ_TYPE_NONE);
>> +		if (ret) {
>> +			dev_err(dev, "no GPIO irqchip\n");
>> +			goto err_unregister_pinconf;
>> +		}
>> +
>> +		gpiochip_set_chained_irqchip(gc, &cygnus_gpio_irq_chip, irq,
>> +					     cygnus_gpio_irq_handler);
>> +	}
>> +
>> +	return 0;
>> +
>> +err_unregister_pinconf:
>> +	cygnus_gpio_unregister_pinconf(chip);
>> +
>> +err_rm_range:
>> +	cygnus_gpio_pinmux_remove_range(chip);
>> +
>> +err_rm_gpiochip:
>> +	gpiochip_remove(gc);
>> +
>> +	return ret;
>> +}
>> +
>> +static struct platform_driver cygnus_gpio_driver = {
>> +	.driver = {
>> +		.name = "cygnus-gpio",
>> +		.of_match_table = cygnus_gpio_of_match,
>> +	},
>> +	.probe = cygnus_gpio_probe,
> 
> The same comment about suppress_bind_attrs.
> 
Okay. Will do!

>> +};
>> +
>> +static int __init cygnus_gpio_init(void)
>> +{
>> +	return platform_driver_probe(&cygnus_gpio_driver, cygnus_gpio_probe);
>> +}
>> +arch_initcall_sync(cygnus_gpio_init);
>> +
>> +MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
>> +MODULE_DESCRIPTION("Broadcom Cygnus GPIO Driver");
>> +MODULE_LICENSE("GPL v2");
>> -- 
>> 1.7.9.5
>>
> 
> Thanks.
> 
Thanks for the review, Dmitry!

Ray

[PATCH v7 2/4] pinctrl: cygnus: add gpio/pinconf driver

[Ray Jui]

On 2/3/2015 5:41 PM, Dmitry Torokhov wrote:
> On Tue, Feb 03, 2015 at 05:09:06PM -0800, Ray Jui wrote:
>> This adds the initial support of the Broadcom Cygnus GPIO/PINCONF driver
>> that supports all 3 GPIO controllers on Cygnus including the ASIU GPIO
>> controller, the chipCommonG GPIO controller, and the always-on GPIO
>> controller. Basic PINCONF configurations such as bias pull up/down, and
>> drive strength are also supported in this driver.
>>
>> Pins from the ASIU GPIO controller can be individually muxed to GPIO
>> function, through interaction with the Cygnus IOMUX controller
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>> ---
>>  drivers/pinctrl/bcm/Kconfig               |   22 +
>>  drivers/pinctrl/bcm/Makefile              |    1 +
>>  drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c |  920 +++++++++++++++++++++++++++++
>>  3 files changed, 943 insertions(+)
>>  create mode 100644 drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c
>>
>> diff --git a/drivers/pinctrl/bcm/Kconfig b/drivers/pinctrl/bcm/Kconfig
>> index eb13201..cd11d4d 100644
>> --- a/drivers/pinctrl/bcm/Kconfig
>> +++ b/drivers/pinctrl/bcm/Kconfig
>> @@ -20,6 +20,28 @@ config PINCTRL_BCM2835
>>  	select PINMUX
>>  	select PINCONF
>>  
>> +config PINCTRL_CYGNUS_GPIO
>> +	bool "Broadcom Cygnus GPIO (with PINCONF) driver"
>> +	depends on OF_GPIO && ARCH_BCM_CYGNUS
>> +	select GPIOLIB_IRQCHIP
>> +	select PINCONF
>> +	select GENERIC_PINCONF
>> +	default ARCH_BCM_CYGNUS
>> +	help
>> +	  Say yes here to enable the Broadcom Cygnus GPIO driver.
>> +
>> +	  The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
>> +	  GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
>> +	  the always-ON GPIO controller (CRMU/AON). All 3 GPIO controllers are
>> +	  supported by this driver.
>> +
>> +	  All 3 Cygnus GPIO controllers support basic PINCONF functions such
>> +	  as bias pull up, pull down, and drive strength configurations, when
>> +	  these pins are muxed to GPIO.
>> +
>> +	  Pins from the ASIU GPIO can be individually muxed to GPIO function,
>> +	  through interaction with the Cygnus IOMUX controller.
>> +
>>  config PINCTRL_CYGNUS_MUX
>>  	bool "Broadcom Cygnus IOMUX driver"
>>  	depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
>> diff --git a/drivers/pinctrl/bcm/Makefile b/drivers/pinctrl/bcm/Makefile
>> index bb6beb6..2b2f70e 100644
>> --- a/drivers/pinctrl/bcm/Makefile
>> +++ b/drivers/pinctrl/bcm/Makefile
>> @@ -2,4 +2,5 @@
>>  
>>  obj-$(CONFIG_PINCTRL_BCM281XX)		+= pinctrl-bcm281xx.o
>>  obj-$(CONFIG_PINCTRL_BCM2835)		+= pinctrl-bcm2835.o
>> +obj-$(CONFIG_PINCTRL_CYGNUS_GPIO)	+= pinctrl-cygnus-gpio.o
>>  obj-$(CONFIG_PINCTRL_CYGNUS_MUX)	+= pinctrl-cygnus-mux.o
>> diff --git a/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c b/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c
>> new file mode 100644
>> index 0000000..cfe4478
>> --- /dev/null
>> +++ b/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c
>> @@ -0,0 +1,920 @@
>> +/*
>> + * Copyright (C) 2014-2015 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + *
>> + * This file contains the Broadcom Cygnus GPIO driver that supports 3
>> + * GPIO controllers on Cygnus including the ASIU GPIO controller, the
>> + * chipCommonG GPIO controller, and the always-on GPIO controller. Basic
>> + * PINCONF such as bias pull up/down, and drive strength are also supported
>> + * in this driver.
>> + *
>> + * Pins from the ASIU GPIO can be individually muxed to GPIO function,
>> + * through the interaction with the Cygnus IOMUX controller
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/slab.h>
>> +#include <linux/module.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/io.h>
>> +#include <linux/gpio.h>
>> +#include <linux/ioport.h>
>> +#include <linux/of_device.h>
>> +#include <linux/of_irq.h>
>> +#include <linux/pinctrl/pinctrl.h>
>> +#include <linux/pinctrl/pinmux.h>
>> +#include <linux/pinctrl/pinconf.h>
>> +#include <linux/pinctrl/pinconf-generic.h>
>> +
>> +#include "../pinctrl-utils.h"
>> +
>> +#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
>> +#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
>> +#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
>> +#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
>> +#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
>> +#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
>> +#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
>> +#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
>> +#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
>> +#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
>> +#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
>> +#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
>> +
>> +/* drive strength control for ASIU GPIO */
>> +#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
>> +
>> +/* drive strength control for CCM/CRMU (AON) GPIO */
>> +#define CYGNUS_GPIO_DRV0_CTRL_OFFSET  0x00
>> +
>> +#define GPIO_BANK_SIZE 0x200
>> +#define NGPIOS_PER_BANK 32
>> +#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
>> +
>> +#define CYGNUS_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + (reg))
>> +#define CYGNUS_GPIO_SHIFT(pin) ((pin) % NGPIOS_PER_BANK)
>> +
>> +#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
>> +#define GPIO_DRV_STRENGTH_BITS       3
>> +#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
>> +
>> +/*
>> + * Cygnus GPIO core
>> + *
>> + * @dev: pointer to device
>> + * @base: I/O register base for Cygnus GPIO controller
>> + * @io_ctrl: I/O register base for certain type of Cygnus GPIO controller that
>> + * has the PINCONF support implemented outside of the GPIO block
>> + * @lock: lock to protect access to I/O registers
>> + * @gc: GPIO chip
>> + * @num_banks: number of GPIO banks, each bank supports up to 32 GPIOs
>> + * @pinmux_is_supported: flag to indicate this GPIO controller contains pins
>> + * that can be individually muxed to GPIO
>> + * @pctl: pointer to pinctrl_dev
>> + * @pctldesc: pinctrl descriptor
>> + * @pins: pointer to array of pins
>> + */
>> +struct cygnus_gpio {
>> +	struct device *dev;
>> +
>> +	void __iomem *base;
>> +	void __iomem *io_ctrl;
>> +
>> +	spinlock_t lock;
>> +
>> +	struct gpio_chip gc;
>> +	unsigned num_banks;
>> +
>> +	int pinmux_is_supported;
> 
> bool?
> 
Yes. Will do.

>> +
>> +	struct pinctrl_dev *pctl;
>> +	struct pinctrl_desc pctldesc;
>> +	struct pinctrl_pin_desc *pins;
>> +};
>> +
>> +static struct cygnus_gpio *to_cygnus_gpio(struct gpio_chip *gc)
>> +{
>> +	return container_of(gc, struct cygnus_gpio, gc);
>> +}
>> +
>> +/*
>> + * Mapping from PINCONF pins to GPIO pins is 1-to-1
>> + */
>> +static unsigned cygnus_pin_to_gpio(unsigned pin)
>> +{
>> +	return pin;
>> +}
>> +
>> +static u32 cygnus_readl(struct cygnus_gpio *chip, unsigned int offset)
>> +{
>> +	return readl(chip->base + offset);
>> +}
>> +
>> +static void cygnus_writel(struct cygnus_gpio *chip, unsigned int offset,
>> +			  u32 val)
>> +{
>> +	writel(val, chip->base + offset);
>> +}
>> +
>> +/**
>> + *  cygnus_set_bit - set or clear one bit (corresponding to the GPIO pin) in a
>> + *  Cygnus GPIO register
>> + *
>> + *  @cygnus_gpio: Cygnus GPIO device
>> + *  @reg: register offset
>> + *  @gpio: GPIO pin
>> + *  @set: set or clear. 1 - set; 0 -clear
>> + */
>> +static void cygnus_set_bit(struct cygnus_gpio *chip, unsigned int reg,
>> +			   unsigned gpio, int set)
>> +{
>> +	unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
>> +	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
>> +	u32 val;
>> +
>> +	val = cygnus_readl(chip, offset);
>> +	if (set)
>> +		val |= BIT(shift);
>> +	else
>> +		val &= ~BIT(shift);
>> +	cygnus_writel(chip, offset, val);
>> +}
>> +
>> +static int cygnus_get_bit(struct cygnus_gpio *chip, unsigned int reg,
>> +			  unsigned gpio)
>> +{
>> +	unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
>> +	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
>> +	u32 val;
>> +
>> +	val = cygnus_readl(chip, offset) & BIT(shift);
>> +	if (val)
>> +		return 1;
>> +	else
>> +		return 0;
>> +}
>> +
>> +static void cygnus_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
>> +{
>> +	struct gpio_chip *gc = irq_desc_get_handler_data(desc);
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	struct irq_chip *irq_chip = irq_desc_get_chip(desc);
>> +	int i, bit;
>> +
>> +	chained_irq_enter(irq_chip, desc);
>> +
>> +	/* go through the entire GPIO banks and handle all interrupts */
>> +	for (i = 0; i < chip->num_banks; i++) {
>> +		unsigned long val = cygnus_readl(chip,
>> +				(i * GPIO_BANK_SIZE) +
>> +				CYGNUS_GPIO_INT_MSTAT_OFFSET);
>> +
>> +		for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
>> +			unsigned pin = NGPIOS_PER_BANK * i + bit;
>> +			int child_irq = irq_find_mapping(gc->irqdomain, pin);
>> +
>> +			/*
>> +			 * Clear the interrupt before invoking the
>> +			 * handler, so we do not leave any window
>> +			 */
>> +			cygnus_writel(chip, (i * GPIO_BANK_SIZE) +
>> +				      CYGNUS_GPIO_INT_CLR_OFFSET, BIT(bit));
>> +
>> +			generic_handle_irq(child_irq);
>> +		}
>> +	}
>> +
>> +	chained_irq_exit(irq_chip, desc);
>> +}
>> +
>> +
>> +static void cygnus_gpio_irq_ack(struct irq_data *d)
>> +{
>> +	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	unsigned gpio = d->hwirq;
>> +	unsigned int offset = CYGNUS_GPIO_REG(gpio,
>> +			CYGNUS_GPIO_INT_CLR_OFFSET);
>> +	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
>> +	u32 val = BIT(shift);
>> +
>> +	cygnus_writel(chip, offset, val);
>> +}
>> +
>> +/**
>> + *  cygnus_gpio_irq_set_mask - mask/unmask a GPIO interrupt
>> + *
>> + *  @d: IRQ chip data
>> + *  @mask: mask/unmask GPIO interrupt. 0 - mask (disable); 1 - unmask (enable)
>> + */
>> +static void cygnus_gpio_irq_set_mask(struct irq_data *d, int mask)
>> +{
>> +	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	unsigned gpio = d->hwirq;
>> +
>> +	cygnus_set_bit(chip, CYGNUS_GPIO_INT_MSK_OFFSET, gpio, mask);
>> +}
>> +
>> +static void cygnus_gpio_irq_mask(struct irq_data *d)
>> +{
>> +	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	unsigned long flags;
>> +
>> +	spin_lock_irqsave(&chip->lock, flags);
>> +	cygnus_gpio_irq_set_mask(d, 0);
>> +	spin_unlock_irqrestore(&chip->lock, flags);
>> +}
>> +
>> +static void cygnus_gpio_irq_unmask(struct irq_data *d)
>> +{
>> +	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	unsigned long flags;
>> +
>> +	spin_lock_irqsave(&chip->lock, flags);
>> +	cygnus_gpio_irq_set_mask(d, 1);
>> +	spin_unlock_irqrestore(&chip->lock, flags);
>> +}
>> +
>> +static int cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
>> +{
>> +	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	unsigned gpio = d->hwirq;
>> +	int int_type = 0, dual_edge = 0, edge_lvl = 0;
>> +	unsigned long flags;
>> +
>> +	switch (type & IRQ_TYPE_SENSE_MASK) {
>> +	case IRQ_TYPE_EDGE_RISING:
>> +		edge_lvl = 1;
>> +		break;
>> +
>> +	case IRQ_TYPE_EDGE_FALLING:
>> +		break;
>> +
>> +	case IRQ_TYPE_EDGE_BOTH:
>> +		dual_edge = 1;
>> +		break;
>> +
>> +	case IRQ_TYPE_LEVEL_HIGH:
>> +		int_type = 1;
>> +		edge_lvl = 1;
>> +		break;
>> +
>> +	case IRQ_TYPE_LEVEL_LOW:
>> +		int_type = 1;
>> +		break;
>> +
>> +	default:
>> +		dev_err(chip->dev, "invalid GPIO IRQ type 0x%x\n",
>> +			type);
>> +		return -EINVAL;
>> +	}
>> +
>> +	spin_lock_irqsave(&chip->lock, flags);
>> +	cygnus_set_bit(chip, CYGNUS_GPIO_IN_TYPE_OFFSET, gpio, int_type);
>> +	cygnus_set_bit(chip, CYGNUS_GPIO_INT_DE_OFFSET, gpio, dual_edge);
>> +	cygnus_set_bit(chip, CYGNUS_GPIO_INT_EDGE_OFFSET, gpio,
>> +		       edge_lvl);
>> +	spin_unlock_irqrestore(&chip->lock, flags);
>> +
>> +	dev_dbg(chip->dev,
>> +		"gpio:%u set int_type:%d dual_edge:%d edge_lvl:%d\n",
>> +		gpio, int_type, dual_edge, edge_lvl);
>> +
>> +	return 0;
>> +}
>> +
>> +static struct irq_chip cygnus_gpio_irq_chip = {
>> +	.name = "bcm-cygnus-gpio",
>> +	.irq_ack = cygnus_gpio_irq_ack,
>> +	.irq_mask = cygnus_gpio_irq_mask,
>> +	.irq_unmask = cygnus_gpio_irq_unmask,
>> +	.irq_set_type = cygnus_gpio_irq_set_type,
>> +};
>> +
>> +/*
>> + * Request the Cygnus IOMUX pinmux controller to mux individual pins to GPIO
>> + */
>> +static int cygnus_gpio_request(struct gpio_chip *gc, unsigned offset)
>> +{
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	unsigned gpio = gc->base + offset;
>> +
>> +	/* not all Cygnus GPIO pins can be muxed individually */
>> +	if (!chip->pinmux_is_supported)
>> +		return 0;
>> +
>> +	return pinctrl_request_gpio(gpio);
>> +}
>> +
>> +static void cygnus_gpio_free(struct gpio_chip *gc, unsigned offset)
>> +{
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	unsigned gpio = gc->base + offset;
>> +
>> +	if (!chip->pinmux_is_supported)
>> +		return;
>> +
>> +	pinctrl_free_gpio(gpio);
>> +}
>> +
>> +static int cygnus_gpio_direction_input(struct gpio_chip *gc, unsigned gpio)
>> +{
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	unsigned long flags;
>> +
>> +	spin_lock_irqsave(&chip->lock, flags);
>> +	cygnus_set_bit(chip, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 0);
>> +	spin_unlock_irqrestore(&chip->lock, flags);
>> +
>> +	dev_dbg(chip->dev, "gpio:%u set input\n", gpio);
>> +
>> +	return 0;
>> +}
>> +
>> +static int cygnus_gpio_direction_output(struct gpio_chip *gc, unsigned gpio,
>> +					int value)
>> +{
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	unsigned long flags;
>> +
>> +	spin_lock_irqsave(&chip->lock, flags);
>> +	cygnus_set_bit(chip, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 1);
>> +	cygnus_set_bit(chip, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
>> +	spin_unlock_irqrestore(&chip->lock, flags);
>> +
>> +	dev_dbg(chip->dev, "gpio:%u set output, value:%d\n", gpio, value);
>> +
>> +	return 0;
>> +}
>> +
>> +static void cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio, int value)
>> +{
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	unsigned long flags;
>> +
>> +	spin_lock_irqsave(&chip->lock, flags);
>> +	cygnus_set_bit(chip, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
>> +	spin_unlock_irqrestore(&chip->lock, flags);
>> +
>> +	dev_dbg(chip->dev, "gpio:%u set, value:%d\n", gpio, value);
>> +}
>> +
>> +static int cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
>> +{
>> +	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
>> +	unsigned int offset = CYGNUS_GPIO_REG(gpio,
>> +					      CYGNUS_GPIO_DATA_IN_OFFSET);
>> +	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
>> +
>> +	return !!(cygnus_readl(chip, offset) & BIT(shift));
>> +}
>> +
>> +static int cygnus_get_groups_count(struct pinctrl_dev *pctldev)
>> +{
>> +	return 1;
>> +}
>> +
>> +/*
>> + * Only one group: "gpio_grp", since this local pinctrl device only performs
>> + * GPIO specific PINCONF configurations
>> + */
>> +static const char *cygnus_get_group_name(struct pinctrl_dev *pctldev,
>> +					 unsigned selector)
>> +{
>> +
> 
> Extra blank line.
> 
Thanks!

>> +	return "gpio_grp";
>> +}
>> +
>> +static const struct pinctrl_ops cygnus_pctrl_ops = {
>> +	.get_groups_count = cygnus_get_groups_count,
>> +	.get_group_name = cygnus_get_group_name,
>> +	.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
>> +	.dt_free_map = pinctrl_utils_dt_free_map,
>> +};
>> +
>> +static int cygnus_gpio_set_pull(struct cygnus_gpio *chip, unsigned gpio,
>> +				int disable, int pull_up)
>> +{
>> +	unsigned long flags;
>> +
>> +	spin_lock_irqsave(&chip->lock, flags);
>> +
>> +	if (disable) {
>> +		cygnus_set_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio, 0);
>> +	} else {
>> +		cygnus_set_bit(chip, CYGNUS_GPIO_PAD_RES_OFFSET, gpio,
>> +			       pull_up);
>> +		cygnus_set_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio, 1);
>> +	}
>> +
>> +	spin_unlock_irqrestore(&chip->lock, flags);
>> +
>> +	dev_dbg(chip->dev, "gpio:%u set pullup:%d\n", gpio, pull_up);
>> +
>> +	return 0;
>> +}
>> +
>> +static void cygnus_gpio_get_pull(struct cygnus_gpio *chip, unsigned gpio,
>> +				 int *disable, int *pull_up)
>> +{
>> +	unsigned long flags;
>> +
>> +	spin_lock_irqsave(&chip->lock, flags);
>> +	*disable = !cygnus_get_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio);
>> +	*pull_up = cygnus_get_bit(chip, CYGNUS_GPIO_PAD_RES_OFFSET, gpio);
>> +	spin_unlock_irqrestore(&chip->lock, flags);
>> +}
>> +
>> +static int cygnus_gpio_set_strength(struct cygnus_gpio *chip, unsigned gpio,
>> +				    unsigned strength)
>> +{
>> +	void __iomem *base;
>> +	unsigned int i, offset, shift;
>> +	u32 val;
>> +	unsigned long flags;
>> +
>> +	/* make sure drive strength is supported */
>> +	if (strength < 2 ||  strength > 16 || (strength % 2))
>> +		return -ENOTSUPP;
>> +
>> +	if (chip->io_ctrl) {
>> +		base = chip->io_ctrl;
>> +		offset = CYGNUS_GPIO_DRV0_CTRL_OFFSET;
>> +	} else {
>> +		base = chip->base;
>> +		offset = CYGNUS_GPIO_REG(gpio,
>> +					 CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET);
>> +	}
>> +
>> +	shift = CYGNUS_GPIO_SHIFT(gpio);
>> +
>> +	dev_dbg(chip->dev, "gpio:%u set drive strength:%d mA\n", gpio,
>> +		strength);
>> +
>> +	spin_lock_irqsave(&chip->lock, flags);
>> +	strength = (strength / 2) - 1;
>> +	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
>> +		val = readl(base + offset);
>> +		val &= ~BIT(shift);
>> +		val |= ((strength >> i) & 0x1) << shift;
>> +		writel(val, base + offset);
>> +		offset += 4;
>> +	}
>> +	spin_unlock_irqrestore(&chip->lock, flags);
>> +
>> +	return 0;
>> +}
>> +
>> +static int cygnus_gpio_get_strength(struct cygnus_gpio *chip, unsigned gpio,
>> +				    u16 *strength)
>> +{
>> +	void __iomem *base;
>> +	unsigned int i, offset, shift;
>> +	u32 val;
>> +	unsigned long flags;
>> +
>> +	if (chip->io_ctrl) {
>> +		base = chip->io_ctrl;
>> +		offset = CYGNUS_GPIO_DRV0_CTRL_OFFSET;
>> +	} else {
>> +		base = chip->base;
>> +		offset = CYGNUS_GPIO_REG(gpio,
>> +					 CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET);
>> +	}
>> +
>> +	shift = CYGNUS_GPIO_SHIFT(gpio);
>> +
>> +	spin_lock_irqsave(&chip->lock, flags);
>> +	*strength = 0;
>> +	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
>> +		val = readl(base + offset) & BIT(shift);
>> +		val >>= shift;
>> +		*strength += (val << i);
>> +		offset += 4;
>> +	}
>> +
>> +	/* convert to mA */
>> +	*strength = (*strength + 1) * 2;
>> +	spin_unlock_irqrestore(&chip->lock, flags);
>> +
>> +	return 0;
>> +}
>> +
>> +static int cygnus_pin_config_get(struct pinctrl_dev *pctldev, unsigned pin,
>> +				 unsigned long *config)
>> +{
>> +	struct cygnus_gpio *chip = pinctrl_dev_get_drvdata(pctldev);
>> +	enum pin_config_param param = pinconf_to_config_param(*config);
>> +	unsigned gpio = cygnus_pin_to_gpio(pin);
>> +	u16 arg;
>> +	int disable, pull_up, ret;
>> +
>> +	switch (param) {
>> +	case PIN_CONFIG_BIAS_DISABLE:
>> +		cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
>> +		if (disable)
>> +			return 0;
>> +		else
>> +			return -EINVAL;
>> +
>> +	case PIN_CONFIG_BIAS_PULL_UP:
>> +		cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
>> +		if (!disable && pull_up)
>> +			return 0;
>> +		else
>> +			return -EINVAL;
>> +
>> +	case PIN_CONFIG_BIAS_PULL_DOWN:
>> +		cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
>> +		if (!disable && !pull_up)
>> +			return 0;
>> +		else
>> +			return -EINVAL;
>> +
>> +	case PIN_CONFIG_DRIVE_STRENGTH:
>> +		ret = cygnus_gpio_get_strength(chip, gpio, &arg);
>> +		if (ret)
>> +			return ret;
>> +		else
>> +			*config = pinconf_to_config_packed(param, arg);
>> +
>> +		return 0;
>> +
>> +	default:
>> +		return -ENOTSUPP;
>> +	}
>> +
>> +	return -ENOTSUPP;
>> +}
>> +
>> +static int cygnus_pin_config_set(struct pinctrl_dev *pctldev, unsigned pin,
>> +				 unsigned long *configs, unsigned num_configs)
>> +{
>> +	struct cygnus_gpio *chip = pinctrl_dev_get_drvdata(pctldev);
>> +	enum pin_config_param param;
>> +	u16 arg;
>> +	unsigned i, gpio = cygnus_pin_to_gpio(pin);
>> +	int ret = -ENOTSUPP;
>> +
>> +	for (i = 0; i < num_configs; i++) {
>> +		param = pinconf_to_config_param(configs[i]);
>> +		arg = pinconf_to_config_argument(configs[i]);
>> +
>> +		switch (param) {
>> +		case PIN_CONFIG_BIAS_DISABLE:
>> +			ret = cygnus_gpio_set_pull(chip, gpio, 1, 0);
>> +			if (ret < 0)
>> +				goto out;
>> +			break;
>> +
>> +		case PIN_CONFIG_BIAS_PULL_UP:
>> +			ret = cygnus_gpio_set_pull(chip, gpio, 0, 1);
>> +			if (ret < 0)
>> +				goto out;
>> +			break;
>> +
>> +		case PIN_CONFIG_BIAS_PULL_DOWN:
>> +			ret = cygnus_gpio_set_pull(chip, gpio, 0, 0);
>> +			if (ret < 0)
>> +				goto out;
>> +			break;
>> +
>> +		case PIN_CONFIG_DRIVE_STRENGTH:
>> +			ret = cygnus_gpio_set_strength(chip, gpio, arg);
>> +			if (ret < 0)
>> +				goto out;
>> +			break;
>> +
>> +		default:
>> +			dev_err(chip->dev, "invalid configuration\n");
>> +			return -ENOTSUPP;
>> +		}
>> +	} /* for each config */
>> +
>> +out:
>> +	return ret;
>> +}
>> +
>> +static const struct pinconf_ops cygnus_pconf_ops = {
>> +	.is_generic = true,
>> +	.pin_config_get = cygnus_pin_config_get,
>> +	.pin_config_set = cygnus_pin_config_set,
>> +};
>> +
>> +/*
>> + * Map a GPIO in the local gpio_chip pin space to a pin in the Cygnus IOMUX
>> + * pinctrl pin space
>> + */
>> +struct cygnus_gpio_pin_range {
>> +	unsigned offset;
>> +	unsigned pin_base;
>> +	unsigned num_pins;
>> +};
>> +
>> +#define CYGNUS_PINRANGE(o, p, n) { .offset = o, .pin_base = p, .num_pins = n }
>> +
>> +/*
>> + * Pin mapping table for mapping local GPIO pins to Cygnus IOMUX pinctrl pins
>> + */
>> +static const struct cygnus_gpio_pin_range cygnus_gpio_pintable[] = {
>> +	CYGNUS_PINRANGE(0, 42, 1),
>> +	CYGNUS_PINRANGE(1, 44, 3),
>> +	CYGNUS_PINRANGE(4, 48, 1),
>> +	CYGNUS_PINRANGE(5, 50, 3),
>> +	CYGNUS_PINRANGE(8, 126, 1),
>> +	CYGNUS_PINRANGE(9, 155, 1),
>> +	CYGNUS_PINRANGE(10, 152, 1),
>> +	CYGNUS_PINRANGE(11, 154, 1),
>> +	CYGNUS_PINRANGE(12, 153, 1),
>> +	CYGNUS_PINRANGE(13, 127, 3),
>> +	CYGNUS_PINRANGE(16, 140, 1),
>> +	CYGNUS_PINRANGE(17, 145, 7),
>> +	CYGNUS_PINRANGE(24, 130, 10),
>> +	CYGNUS_PINRANGE(34, 141, 4),
>> +	CYGNUS_PINRANGE(38, 54, 1),
>> +	CYGNUS_PINRANGE(39, 56, 3),
>> +	CYGNUS_PINRANGE(42, 60, 3),
>> +	CYGNUS_PINRANGE(45, 64, 3),
>> +	CYGNUS_PINRANGE(48, 68, 2),
>> +	CYGNUS_PINRANGE(50, 84, 6),
>> +	CYGNUS_PINRANGE(56, 94, 6),
>> +	CYGNUS_PINRANGE(62, 72, 1),
>> +	CYGNUS_PINRANGE(63, 70, 1),
>> +	CYGNUS_PINRANGE(64, 80, 1),
>> +	CYGNUS_PINRANGE(65, 74, 3),
>> +	CYGNUS_PINRANGE(68, 78, 1),
>> +	CYGNUS_PINRANGE(69, 82, 1),
>> +	CYGNUS_PINRANGE(70, 156, 17),
>> +	CYGNUS_PINRANGE(87, 104, 12),
>> +	CYGNUS_PINRANGE(99, 102, 2),
>> +	CYGNUS_PINRANGE(101, 90, 4),
>> +	CYGNUS_PINRANGE(105, 116, 10),
>> +	CYGNUS_PINRANGE(123, 11, 1),
>> +	CYGNUS_PINRANGE(124, 38, 4),
>> +	CYGNUS_PINRANGE(128, 43, 1),
>> +	CYGNUS_PINRANGE(129, 47, 1),
>> +	CYGNUS_PINRANGE(130, 49, 1),
>> +	CYGNUS_PINRANGE(131, 53, 1),
>> +	CYGNUS_PINRANGE(132, 55, 1),
>> +	CYGNUS_PINRANGE(133, 59, 1),
>> +	CYGNUS_PINRANGE(134, 63, 1),
>> +	CYGNUS_PINRANGE(135, 67, 1),
>> +	CYGNUS_PINRANGE(136, 71, 1),
>> +	CYGNUS_PINRANGE(137, 73, 1),
>> +	CYGNUS_PINRANGE(138, 77, 1),
>> +	CYGNUS_PINRANGE(139, 79, 1),
>> +	CYGNUS_PINRANGE(140, 81, 1),
>> +	CYGNUS_PINRANGE(141, 83, 1),
>> +	CYGNUS_PINRANGE(142, 10, 1)
>> +};
>> +
>> +/*
>> + * The Cygnus IOMUX controller mainly supports group based mux configuration,
>> + * but certain pins can be muxed to GPIO individually. Only the ASIU GPIO
>> + * controller can support this, so it's an optional configuration
>> + *
>> + * Return -ENODEV means no support and that's fine
>> + */
>> +static int cygnus_gpio_pinmux_add_range(struct cygnus_gpio *chip)
>> +{
>> +	struct device_node *node = chip->dev->of_node;
>> +	struct device_node *pinmux_node;
>> +	struct platform_device *pinmux_pdev;
>> +	struct gpio_chip *gc = &chip->gc;
>> +	int i, ret;
>> +
>> +	/* parse DT to find the phandle to the pinmux controller */
>> +	pinmux_node = of_parse_phandle(node, "pinmux", 0);
>> +	if (!pinmux_node)
>> +		return -ENODEV;
>> +
>> +	pinmux_pdev = of_find_device_by_node(pinmux_node);
>> +	if (!pinmux_pdev) {
>> +		dev_err(chip->dev, "failed to get pinmux device\n");
>> +		return -EINVAL;
>> +	}
>> +
>> +	/* now need to create the mapping between local GPIO and PINMUX pins */
>> +	for (i = 0; i < ARRAY_SIZE(cygnus_gpio_pintable); i++) {
>> +		ret = gpiochip_add_pin_range(gc, dev_name(&pinmux_pdev->dev),
>> +					     cygnus_gpio_pintable[i].offset,
>> +					     cygnus_gpio_pintable[i].pin_base,
>> +					     cygnus_gpio_pintable[i].num_pins);
>> +		if (ret) {
>> +			dev_err(chip->dev, "unable to add GPIO pin range\n");
>> +			goto err_rm_pin_range;
>> +		}
>> +	}
>> +
>> +	chip->pinmux_is_supported = 1;
> 
> 	chip->pinmux_is_supported = true;
> 
> ?
> 
>> +	return 0;
>> +
>> +err_rm_pin_range:
>> +	gpiochip_remove_pin_ranges(gc);
> 
> I think you need:
> 
> 	put_dveice(&pinmux_pdev->dev);
> 
> since of_find_device_by_node calls bus_find_device() that takes
> reference to found device.
> 
> ... And now that I look at this majority of users of
> of_find_device_by_node() is broken like that :(
> 
> BTW, it looks like you only need pinmux_dev for it's name so you
> probably need to drop reference in success path as well.
> 
Oh wow! Really good to know. Will fix!

>> +	return ret;
>> +}
>> +
>> +static void cygnus_gpio_pinmux_remove_range(struct cygnus_gpio *chip)
>> +{
>> +	struct gpio_chip *gc = &chip->gc;
>> +
>> +	if (chip->pinmux_is_supported)
>> +		gpiochip_remove_pin_ranges(gc);
>> +}
>> +
>> +/*
>> + * Cygnus GPIO controller supports some PINCONF related configurations such as
>> + * pull up, pull down, and drive strength, when the pin is configured to GPIO
>> + *
>> + * Here a local pinctrl device is created with simple 1-to-1 pin mapping to the
>> + * local GPIO pins
>> + */
>> +static int cygnus_gpio_register_pinconf(struct cygnus_gpio *chip)
>> +{
>> +	struct pinctrl_desc *pctldesc = &chip->pctldesc;
>> +	struct pinctrl_pin_desc *pins;
>> +	struct gpio_chip *gc = &chip->gc;
>> +	int i, ret;
>> +
>> +	pins = devm_kcalloc(chip->dev, gc->ngpio, sizeof(*pins), GFP_KERNEL);
>> +	if (!pins)
>> +		return -ENOMEM;
>> +	chip->pins = pins;
>> +
>> +	for (i = 0; i < gc->ngpio; i++) {
>> +		pins[i].number = i;
>> +		pins[i].name = kasprintf(GFP_KERNEL, "gpio-%d", i);
> 
> We have devm_kasprintf().
> 
I was not aware of that. Okay I'll change to devm_kasprintf so I can get
rid of some memory free code below. Thanks!

>> +		if (!pins[i].name) {
>> +			ret = -ENOMEM;
>> +			goto err_kfree;
>> +		}
>> +	}
>> +
>> +	pctldesc->name = dev_name(chip->dev);
>> +	pctldesc->pctlops = &cygnus_pctrl_ops;
>> +	pctldesc->pins = pins;
>> +	pctldesc->npins = gc->ngpio;
>> +	pctldesc->confops = &cygnus_pconf_ops;
>> +
>> +	chip->pctl = pinctrl_register(pctldesc, chip->dev, chip);
>> +	if (!chip->pctl) {
>> +		dev_err(chip->dev, "unable to register pinctrl device\n");
>> +		ret = -EINVAL;
>> +		goto err_kfree;
>> +	}
>> +
>> +	return 0;
>> +
>> +err_kfree:
>> +	for (i = 0; i < gc->ngpio; i++)
>> +		kfree(pins[i].name);
>> +
>> +	return ret;
>> +}
>> +
>> +static void cygnus_gpio_unregister_pinconf(struct cygnus_gpio *chip)
>> +{
>> +	struct gpio_chip *gc = &chip->gc;
>> +	int i;
>> +
>> +	if (chip->pctl)
>> +		pinctrl_unregister(chip->pctl);
>> +
>> +	for (i = 0; i < gc->ngpio; i++)
>> +		kfree(chip->pins[i].name);
> 
> Should not be needed if you use devm_kasprintf.
> 
Yes!

>> +}
>> +
>> +static const struct of_device_id cygnus_gpio_of_match[] = {
>> +	{ .compatible = "brcm,cygnus-gpio" },
>> +	{ }
>> +};
>> +MODULE_DEVICE_TABLE(of, cygnus_gpio_of_match);
>> +
>> +static int cygnus_gpio_probe(struct platform_device *pdev)
>> +{
>> +	struct device *dev = &pdev->dev;
>> +	struct resource *res;
>> +	struct cygnus_gpio *chip;
>> +	struct gpio_chip *gc;
>> +	u32 ngpios;
>> +	int irq, ret;
>> +
>> +	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
>> +	if (!chip)
>> +		return -ENOMEM;
>> +
>> +	chip->dev = dev;
>> +	platform_set_drvdata(pdev, chip);
>> +
>> +	if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
>> +		dev_err(dev, "missing ngpios DT property\n");
>> +		return -ENODEV;
>> +	}
>> +	chip->num_banks = (ngpios + NGPIOS_PER_BANK - 1) / NGPIOS_PER_BANK;
>> +
>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +	chip->base = devm_ioremap_resource(dev, res);
>> +	if (IS_ERR(chip->base)) {
>> +		dev_err(dev, "unable to map I/O memory\n");
>> +		return PTR_ERR(chip->base);
>> +	}
>> +
>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
>> +	if (res) {
>> +		chip->io_ctrl = devm_ioremap_resource(dev, res);
>> +		if (IS_ERR(chip->io_ctrl)) {
>> +			dev_err(dev, "unable to map I/O memory\n");
>> +			return PTR_ERR(chip->io_ctrl);
>> +		}
>> +	}
>> +
>> +	spin_lock_init(&chip->lock);
>> +
>> +	gc = &chip->gc;
>> +	gc->base = -1;
>> +	gc->ngpio = ngpios;
>> +	gc->label = dev_name(dev);
>> +	gc->dev = dev;
>> +	gc->of_node = dev->of_node;
>> +	gc->request = cygnus_gpio_request;
>> +	gc->free = cygnus_gpio_free;
>> +	gc->direction_input = cygnus_gpio_direction_input;
>> +	gc->direction_output = cygnus_gpio_direction_output;
>> +	gc->set = cygnus_gpio_set;
>> +	gc->get = cygnus_gpio_get;
>> +
>> +	ret = gpiochip_add(gc);
>> +	if (ret < 0) {
>> +		dev_err(dev, "unable to add GPIO chip\n");
>> +		return ret;
>> +	}
>> +
>> +	ret = cygnus_gpio_pinmux_add_range(chip);
>> +	if (ret && ret != -ENODEV) {
>> +		dev_err(dev, "unable to add GPIO pin range\n");
>> +		goto err_rm_gpiochip;
>> +	}
>> +
>> +	ret = cygnus_gpio_register_pinconf(chip);
>> +	if (ret) {
>> +		dev_err(dev, "unable to register pinconf\n");
>> +		goto err_rm_range;
>> +	}
>> +
>> +	/* optional GPIO interrupt support */
>> +	irq = platform_get_irq(pdev, 0);
>> +	if (irq) {
>> +		ret = gpiochip_irqchip_add(gc, &cygnus_gpio_irq_chip, 0,
>> +					   handle_simple_irq, IRQ_TYPE_NONE);
>> +		if (ret) {
>> +			dev_err(dev, "no GPIO irqchip\n");
>> +			goto err_unregister_pinconf;
>> +		}
>> +
>> +		gpiochip_set_chained_irqchip(gc, &cygnus_gpio_irq_chip, irq,
>> +					     cygnus_gpio_irq_handler);
>> +	}
>> +
>> +	return 0;
>> +
>> +err_unregister_pinconf:
>> +	cygnus_gpio_unregister_pinconf(chip);
>> +
>> +err_rm_range:
>> +	cygnus_gpio_pinmux_remove_range(chip);
>> +
>> +err_rm_gpiochip:
>> +	gpiochip_remove(gc);
>> +
>> +	return ret;
>> +}
>> +
>> +static struct platform_driver cygnus_gpio_driver = {
>> +	.driver = {
>> +		.name = "cygnus-gpio",
>> +		.of_match_table = cygnus_gpio_of_match,
>> +	},
>> +	.probe = cygnus_gpio_probe,
> 
> The same comment about suppress_bind_attrs.
> 
Okay. Will do!

>> +};
>> +
>> +static int __init cygnus_gpio_init(void)
>> +{
>> +	return platform_driver_probe(&cygnus_gpio_driver, cygnus_gpio_probe);
>> +}
>> +arch_initcall_sync(cygnus_gpio_init);
>> +
>> +MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
>> +MODULE_DESCRIPTION("Broadcom Cygnus GPIO Driver");
>> +MODULE_LICENSE("GPL v2");
>> -- 
>> 1.7.9.5
>>
> 
> Thanks.
> 
Thanks for the review, Dmitry!

Ray

[PATCH v8 0/4] Add gpio/pinconf support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial GPIO/PINCONF support for the Broadcom
Cygnus SoC.

Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
the this driver.

All 3 Cygnus GPIO controllers support basic PINCONF functions such as bias
pull up, pull down, and drive strength configurations, when these pins are
muxed to GPIO.

Pins from the ASIU GPIO can be individually muxed to GPIO function, through
interaction with the Cygnus IOMUX controller.

Note this patchset has a dependency on the other patchset "Add pinctrl support
to Broadcom Cygnus SoC" that is also under review

Changes from v7:
 - Use 'bool' instead of 'int' for flag that indicates pinmux support in the
   driver
 - Call put_device to drop reference to the pinmux dev after call to
   of_find_device_by_node
 - Replace kasprintf with devm_kasprintf and remove memory deallocation logic
   in the driver
 - Set suppress_bind_attrs to true for the driver

Changes from v6:
 - Move the driver from drivers/gpio/* to drivers/pinctrl/* since this driver
   supports both GPIO and some basic PINCONF features
 - Support PINCONF features through standard DT subnodes properties including
   "bias-disable", "bias-pull-up", "bias-pull-down", and "drive-strength", by
   creating local PINCONF controller
 - Add support to allow individual ASIU GPIO pins to be muxed as GPIO, through
   interactions with the Cygnus IOMUX driver
 - Convert the driver to use standard GPIOCHIP_IRQ APIs. This helps to reduce
   customized code in the driver
 - Other miscellaneous imrpovements in the driver
 - Enable GPIO based phone hook detection support for BCM911360 phone factor
   board

Changes from v5:
 - Get rid of DT property "linux,gpio-base". Use dynamic allocation for GPIO base
   number

Changes from v4:
 - Use DT property "linux,gpio-base" to define GPIO base number
 - factorize common code to improve code readability and reduce code size
 - remove "bcm_" prefix on function and struct names
 - improve debugging prints
 - default GPIO_BCM_CYGNUS to y in Kconfig (it still depends on
   ARCH_BCM_CYGNUS). This way we do not need to select it from the
   arch/arm/mach-bcm/Kconfig
 - Get rid of redundant MAINTAINER entry for this driver. It will be maintained
   by Broadcom iProc/Cygnus maintainers
 - Update device tree document based on driver changes

Changes from v3:
 - Fix dt property tpyo
 - Fix incorrect GPIO compatible ID in device tree binding document example

Changes from v2:
 - Consolidate different compatible IDs into "brcm,cygnus-gpio"
 - Get rid of redundant "no-interrupt" property

Changes from v1:
 - Get rid of inline qualifier
 - Get rid of redundant check in the ISR
 - Other minor fixes to imrove code readability

Ray Jui (4):
  pinctrl: Cygnus: define Broadcom Cygnus GPIO/PINCONF binding
  pinctrl: cygnus: add gpio/pinconf driver
  ARM: dts: enable GPIO for Broadcom Cygnus
  ARM: dts: cygnus: enable GPIO based hook detection

 .../bindings/pinctrl/brcm,cygnus-gpio.txt          |  102 +++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   33 +
 arch/arm/boot/dts/bcm911360_entphn.dts             |   13 +
 drivers/pinctrl/bcm/Kconfig                        |   22 +
 drivers/pinctrl/bcm/Makefile                       |    1 +
 drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c          |  907 ++++++++++++++++++++
 6 files changed, 1078 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt
 create mode 100644 drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c

-- 
1.7.9.5

[PATCH v8 0/4] Add gpio/pinconf support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial GPIO/PINCONF support for the Broadcom
Cygnus SoC.

Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
the this driver.

All 3 Cygnus GPIO controllers support basic PINCONF functions such as bias
pull up, pull down, and drive strength configurations, when these pins are
muxed to GPIO.

Pins from the ASIU GPIO can be individually muxed to GPIO function, through
interaction with the Cygnus IOMUX controller.

Note this patchset has a dependency on the other patchset "Add pinctrl support
to Broadcom Cygnus SoC" that is also under review

Changes from v7:
 - Use 'bool' instead of 'int' for flag that indicates pinmux support in the
   driver
 - Call put_device to drop reference to the pinmux dev after call to
   of_find_device_by_node
 - Replace kasprintf with devm_kasprintf and remove memory deallocation logic
   in the driver
 - Set suppress_bind_attrs to true for the driver

Changes from v6:
 - Move the driver from drivers/gpio/* to drivers/pinctrl/* since this driver
   supports both GPIO and some basic PINCONF features
 - Support PINCONF features through standard DT subnodes properties including
   "bias-disable", "bias-pull-up", "bias-pull-down", and "drive-strength", by
   creating local PINCONF controller
 - Add support to allow individual ASIU GPIO pins to be muxed as GPIO, through
   interactions with the Cygnus IOMUX driver
 - Convert the driver to use standard GPIOCHIP_IRQ APIs. This helps to reduce
   customized code in the driver
 - Other miscellaneous imrpovements in the driver
 - Enable GPIO based phone hook detection support for BCM911360 phone factor
   board

Changes from v5:
 - Get rid of DT property "linux,gpio-base". Use dynamic allocation for GPIO base
   number

Changes from v4:
 - Use DT property "linux,gpio-base" to define GPIO base number
 - factorize common code to improve code readability and reduce code size
 - remove "bcm_" prefix on function and struct names
 - improve debugging prints
 - default GPIO_BCM_CYGNUS to y in Kconfig (it still depends on
   ARCH_BCM_CYGNUS). This way we do not need to select it from the
   arch/arm/mach-bcm/Kconfig
 - Get rid of redundant MAINTAINER entry for this driver. It will be maintained
   by Broadcom iProc/Cygnus maintainers
 - Update device tree document based on driver changes

Changes from v3:
 - Fix dt property tpyo
 - Fix incorrect GPIO compatible ID in device tree binding document example

Changes from v2:
 - Consolidate different compatible IDs into "brcm,cygnus-gpio"
 - Get rid of redundant "no-interrupt" property

Changes from v1:
 - Get rid of inline qualifier
 - Get rid of redundant check in the ISR
 - Other minor fixes to imrove code readability

Ray Jui (4):
  pinctrl: Cygnus: define Broadcom Cygnus GPIO/PINCONF binding
  pinctrl: cygnus: add gpio/pinconf driver
  ARM: dts: enable GPIO for Broadcom Cygnus
  ARM: dts: cygnus: enable GPIO based hook detection

 .../bindings/pinctrl/brcm,cygnus-gpio.txt          |  102 +++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   33 +
 arch/arm/boot/dts/bcm911360_entphn.dts             |   13 +
 drivers/pinctrl/bcm/Kconfig                        |   22 +
 drivers/pinctrl/bcm/Makefile                       |    1 +
 drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c          |  907 ++++++++++++++++++++
 6 files changed, 1078 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt
 create mode 100644 drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c

-- 
1.7.9.5

[PATCH v8 0/4] Add gpio/pinconf support to Broadcom Cygnus SoC

[Ray Jui]

This patchset contains the initial GPIO/PINCONF support for the Broadcom
Cygnus SoC.

Cygnus has 3 GPIO controllers: 1) the ASIU GPIO; 2) the chipCommonG GPIO;
and 3) the ALWAYS-ON GPIO. All 3 types of GPIO controllers are supported by
the this driver.

All 3 Cygnus GPIO controllers support basic PINCONF functions such as bias
pull up, pull down, and drive strength configurations, when these pins are
muxed to GPIO.

Pins from the ASIU GPIO can be individually muxed to GPIO function, through
interaction with the Cygnus IOMUX controller.

Note this patchset has a dependency on the other patchset "Add pinctrl support
to Broadcom Cygnus SoC" that is also under review

Changes from v7:
 - Use 'bool' instead of 'int' for flag that indicates pinmux support in the
   driver
 - Call put_device to drop reference to the pinmux dev after call to
   of_find_device_by_node
 - Replace kasprintf with devm_kasprintf and remove memory deallocation logic
   in the driver
 - Set suppress_bind_attrs to true for the driver

Changes from v6:
 - Move the driver from drivers/gpio/* to drivers/pinctrl/* since this driver
   supports both GPIO and some basic PINCONF features
 - Support PINCONF features through standard DT subnodes properties including
   "bias-disable", "bias-pull-up", "bias-pull-down", and "drive-strength", by
   creating local PINCONF controller
 - Add support to allow individual ASIU GPIO pins to be muxed as GPIO, through
   interactions with the Cygnus IOMUX driver
 - Convert the driver to use standard GPIOCHIP_IRQ APIs. This helps to reduce
   customized code in the driver
 - Other miscellaneous imrpovements in the driver
 - Enable GPIO based phone hook detection support for BCM911360 phone factor
   board

Changes from v5:
 - Get rid of DT property "linux,gpio-base". Use dynamic allocation for GPIO base
   number

Changes from v4:
 - Use DT property "linux,gpio-base" to define GPIO base number
 - factorize common code to improve code readability and reduce code size
 - remove "bcm_" prefix on function and struct names
 - improve debugging prints
 - default GPIO_BCM_CYGNUS to y in Kconfig (it still depends on
   ARCH_BCM_CYGNUS). This way we do not need to select it from the
   arch/arm/mach-bcm/Kconfig
 - Get rid of redundant MAINTAINER entry for this driver. It will be maintained
   by Broadcom iProc/Cygnus maintainers
 - Update device tree document based on driver changes

Changes from v3:
 - Fix dt property tpyo
 - Fix incorrect GPIO compatible ID in device tree binding document example

Changes from v2:
 - Consolidate different compatible IDs into "brcm,cygnus-gpio"
 - Get rid of redundant "no-interrupt" property

Changes from v1:
 - Get rid of inline qualifier
 - Get rid of redundant check in the ISR
 - Other minor fixes to imrove code readability

Ray Jui (4):
  pinctrl: Cygnus: define Broadcom Cygnus GPIO/PINCONF binding
  pinctrl: cygnus: add gpio/pinconf driver
  ARM: dts: enable GPIO for Broadcom Cygnus
  ARM: dts: cygnus: enable GPIO based hook detection

 .../bindings/pinctrl/brcm,cygnus-gpio.txt          |  102 +++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   33 +
 arch/arm/boot/dts/bcm911360_entphn.dts             |   13 +
 drivers/pinctrl/bcm/Kconfig                        |   22 +
 drivers/pinctrl/bcm/Makefile                       |    1 +
 drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c          |  907 ++++++++++++++++++++
 6 files changed, 1078 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt
 create mode 100644 drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c

-- 
1.7.9.5

[PATCH v8 1/4] pinctrl: Cygnus: define Broadcom Cygnus GPIO/PINCONF binding

[Ray Jui]

Document the GPIO/PINCONF device tree binding for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../bindings/pinctrl/brcm,cygnus-gpio.txt          |  102 ++++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt

diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt
new file mode 100644
index 0000000..9b9196c
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt
@@ -0,0 +1,102 @@
+Broadcom Cygnus GPIO/PINCONF Controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,cygnus-gpio"
+
+- reg:
+    Define the base and range of the I/O address space that contains the Cygnus
+GPIO/PINCONF controller registers
+
+- ngpios:
+    Total number of GPIOs the controller provides
+
+- #gpio-cells:
+    Must be two. The first cell is the GPIO pin number (within the
+controller's pin space) and the second cell is used for the following:
+    bit[0]: polarity (0 for active high and 1 for active low)
+
+- gpio-controller:
+    Specifies that the node is a GPIO controller
+
+Optional properties:
+
+- interrupts:
+    Interrupt ID
+
+- interrupt-controller:
+    Specifies that the node is an interrupt controller
+
+- pinmux:
+    Specifies the phandle to the IOMUX device, where pins can be individually
+muxed to GPIO
+
+Supported generic PINCONF properties in child nodes:
+
+- pins:
+    The list of pins (within the controller's own pin space) that properties
+in the node apply to. Pin names are "gpio-<pin>"
+
+- bias-disable:
+    Disable pin bias
+
+- bias-pull-up:
+    Enable internal pull up resistor
+
+- bias-pull-down:
+    Enable internal pull down resistor
+
+- drive-strength:
+    Valid drive strength values include 2, 4, 6, 8, 10, 12, 14, 16 (mA)
+
+Example:
+	gpio_ccm: gpio@1800a000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x1800a000 0x50>,
+		      <0x0301d164 0x20>;
+		ngpios = <24>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+
+		touch_pins: touch_pins {
+			pwr: pwr {
+				pins = "gpio-0";
+				drive-strength = <16>;
+			};
+
+			event: event {
+				pins = "gpio-1";
+				bias-pull-up;
+			};
+		};
+	};
+
+	gpio_asiu: gpio@180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <146>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+	};
+
+	/*
+	 * Touchscreen that uses the CCM GPIO 0 and 1
+	 */
+	tsc {
+		...
+		...
+		gpio-pwr = <&gpio_ccm 0 0>;
+		gpio-event = <&gpio_ccm 1 0>;
+	};
+
+	/* Bluetooth that uses the ASIU GPIO 5, with polarity inverted */
+	bluetooth {
+		...
+		...
+		bcm,rfkill-bank-sel = <&gpio_asiu 5 1>
+	}
-- 
1.7.9.5

[PATCH v8 1/4] pinctrl: Cygnus: define Broadcom Cygnus GPIO/PINCONF binding

[Ray Jui]

Document the GPIO/PINCONF device tree binding for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../bindings/pinctrl/brcm,cygnus-gpio.txt          |  102 ++++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt

diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt
new file mode 100644
index 0000000..9b9196c
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt
@@ -0,0 +1,102 @@
+Broadcom Cygnus GPIO/PINCONF Controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,cygnus-gpio"
+
+- reg:
+    Define the base and range of the I/O address space that contains the Cygnus
+GPIO/PINCONF controller registers
+
+- ngpios:
+    Total number of GPIOs the controller provides
+
+- #gpio-cells:
+    Must be two. The first cell is the GPIO pin number (within the
+controller's pin space) and the second cell is used for the following:
+    bit[0]: polarity (0 for active high and 1 for active low)
+
+- gpio-controller:
+    Specifies that the node is a GPIO controller
+
+Optional properties:
+
+- interrupts:
+    Interrupt ID
+
+- interrupt-controller:
+    Specifies that the node is an interrupt controller
+
+- pinmux:
+    Specifies the phandle to the IOMUX device, where pins can be individually
+muxed to GPIO
+
+Supported generic PINCONF properties in child nodes:
+
+- pins:
+    The list of pins (within the controller's own pin space) that properties
+in the node apply to. Pin names are "gpio-<pin>"
+
+- bias-disable:
+    Disable pin bias
+
+- bias-pull-up:
+    Enable internal pull up resistor
+
+- bias-pull-down:
+    Enable internal pull down resistor
+
+- drive-strength:
+    Valid drive strength values include 2, 4, 6, 8, 10, 12, 14, 16 (mA)
+
+Example:
+	gpio_ccm: gpio@1800a000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x1800a000 0x50>,
+		      <0x0301d164 0x20>;
+		ngpios = <24>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+
+		touch_pins: touch_pins {
+			pwr: pwr {
+				pins = "gpio-0";
+				drive-strength = <16>;
+			};
+
+			event: event {
+				pins = "gpio-1";
+				bias-pull-up;
+			};
+		};
+	};
+
+	gpio_asiu: gpio@180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <146>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+	};
+
+	/*
+	 * Touchscreen that uses the CCM GPIO 0 and 1
+	 */
+	tsc {
+		...
+		...
+		gpio-pwr = <&gpio_ccm 0 0>;
+		gpio-event = <&gpio_ccm 1 0>;
+	};
+
+	/* Bluetooth that uses the ASIU GPIO 5, with polarity inverted */
+	bluetooth {
+		...
+		...
+		bcm,rfkill-bank-sel = <&gpio_asiu 5 1>
+	}
-- 
1.7.9.5

[PATCH v8 1/4] pinctrl: Cygnus: define Broadcom Cygnus GPIO/PINCONF binding

[Ray Jui]

Document the GPIO/PINCONF device tree binding for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 .../bindings/pinctrl/brcm,cygnus-gpio.txt          |  102 ++++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt

diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt
new file mode 100644
index 0000000..9b9196c
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt
@@ -0,0 +1,102 @@
+Broadcom Cygnus GPIO/PINCONF Controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,cygnus-gpio"
+
+- reg:
+    Define the base and range of the I/O address space that contains the Cygnus
+GPIO/PINCONF controller registers
+
+- ngpios:
+    Total number of GPIOs the controller provides
+
+- #gpio-cells:
+    Must be two. The first cell is the GPIO pin number (within the
+controller's pin space) and the second cell is used for the following:
+    bit[0]: polarity (0 for active high and 1 for active low)
+
+- gpio-controller:
+    Specifies that the node is a GPIO controller
+
+Optional properties:
+
+- interrupts:
+    Interrupt ID
+
+- interrupt-controller:
+    Specifies that the node is an interrupt controller
+
+- pinmux:
+    Specifies the phandle to the IOMUX device, where pins can be individually
+muxed to GPIO
+
+Supported generic PINCONF properties in child nodes:
+
+- pins:
+    The list of pins (within the controller's own pin space) that properties
+in the node apply to. Pin names are "gpio-<pin>"
+
+- bias-disable:
+    Disable pin bias
+
+- bias-pull-up:
+    Enable internal pull up resistor
+
+- bias-pull-down:
+    Enable internal pull down resistor
+
+- drive-strength:
+    Valid drive strength values include 2, 4, 6, 8, 10, 12, 14, 16 (mA)
+
+Example:
+	gpio_ccm: gpio at 1800a000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x1800a000 0x50>,
+		      <0x0301d164 0x20>;
+		ngpios = <24>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+
+		touch_pins: touch_pins {
+			pwr: pwr {
+				pins = "gpio-0";
+				drive-strength = <16>;
+			};
+
+			event: event {
+				pins = "gpio-1";
+				bias-pull-up;
+			};
+		};
+	};
+
+	gpio_asiu: gpio at 180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <146>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+	};
+
+	/*
+	 * Touchscreen that uses the CCM GPIO 0 and 1
+	 */
+	tsc {
+		...
+		...
+		gpio-pwr = <&gpio_ccm 0 0>;
+		gpio-event = <&gpio_ccm 1 0>;
+	};
+
+	/* Bluetooth that uses the ASIU GPIO 5, with polarity inverted */
+	bluetooth {
+		...
+		...
+		bcm,rfkill-bank-sel = <&gpio_asiu 5 1>
+	}
-- 
1.7.9.5

[PATCH v8 2/4] pinctrl: cygnus: add gpio/pinconf driver

[Ray Jui]

This adds the initial support of the Broadcom Cygnus GPIO/PINCONF driver
that supports all 3 GPIO controllers on Cygnus including the ASIU GPIO
controller, the chipCommonG GPIO controller, and the always-on GPIO
controller. Basic PINCONF configurations such as bias pull up/down, and
drive strength are also supported in this driver.

Pins from the ASIU GPIO controller can be individually muxed to GPIO
function, through interaction with the Cygnus IOMUX controller

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/pinctrl/bcm/Kconfig               |   22 +
 drivers/pinctrl/bcm/Makefile              |    1 +
 drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c |  907 +++++++++++++++++++++++++++++
 3 files changed, 930 insertions(+)
 create mode 100644 drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c

diff --git a/drivers/pinctrl/bcm/Kconfig b/drivers/pinctrl/bcm/Kconfig
index eb13201..cd11d4d 100644
--- a/drivers/pinctrl/bcm/Kconfig
+++ b/drivers/pinctrl/bcm/Kconfig
@@ -20,6 +20,28 @@ config PINCTRL_BCM2835
 	select PINMUX
 	select PINCONF
 
+config PINCTRL_CYGNUS_GPIO
+	bool "Broadcom Cygnus GPIO (with PINCONF) driver"
+	depends on OF_GPIO && ARCH_BCM_CYGNUS
+	select GPIOLIB_IRQCHIP
+	select PINCONF
+	select GENERIC_PINCONF
+	default ARCH_BCM_CYGNUS
+	help
+	  Say yes here to enable the Broadcom Cygnus GPIO driver.
+
+	  The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
+	  GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
+	  the always-ON GPIO controller (CRMU/AON). All 3 GPIO controllers are
+	  supported by this driver.
+
+	  All 3 Cygnus GPIO controllers support basic PINCONF functions such
+	  as bias pull up, pull down, and drive strength configurations, when
+	  these pins are muxed to GPIO.
+
+	  Pins from the ASIU GPIO can be individually muxed to GPIO function,
+	  through interaction with the Cygnus IOMUX controller.
+
 config PINCTRL_CYGNUS_MUX
 	bool "Broadcom Cygnus IOMUX driver"
 	depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
diff --git a/drivers/pinctrl/bcm/Makefile b/drivers/pinctrl/bcm/Makefile
index bb6beb6..2b2f70e 100644
--- a/drivers/pinctrl/bcm/Makefile
+++ b/drivers/pinctrl/bcm/Makefile
@@ -2,4 +2,5 @@
 
 obj-$(CONFIG_PINCTRL_BCM281XX)		+= pinctrl-bcm281xx.o
 obj-$(CONFIG_PINCTRL_BCM2835)		+= pinctrl-bcm2835.o
+obj-$(CONFIG_PINCTRL_CYGNUS_GPIO)	+= pinctrl-cygnus-gpio.o
 obj-$(CONFIG_PINCTRL_CYGNUS_MUX)	+= pinctrl-cygnus-mux.o
diff --git a/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c b/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c
new file mode 100644
index 0000000..1feab0c
--- /dev/null
+++ b/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c
@@ -0,0 +1,907 @@
+/*
+ * Copyright (C) 2014-2015 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * This file contains the Broadcom Cygnus GPIO driver that supports 3
+ * GPIO controllers on Cygnus including the ASIU GPIO controller, the
+ * chipCommonG GPIO controller, and the always-on GPIO controller. Basic
+ * PINCONF such as bias pull up/down, and drive strength are also supported
+ * in this driver.
+ *
+ * Pins from the ASIU GPIO can be individually muxed to GPIO function,
+ * through the interaction with the Cygnus IOMUX controller
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/ioport.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+
+#include "../pinctrl-utils.h"
+
+#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
+#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
+#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
+#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
+#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
+#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
+#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
+#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
+#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
+#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
+#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
+#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
+
+/* drive strength control for ASIU GPIO */
+#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
+
+/* drive strength control for CCM/CRMU (AON) GPIO */
+#define CYGNUS_GPIO_DRV0_CTRL_OFFSET  0x00
+
+#define GPIO_BANK_SIZE 0x200
+#define NGPIOS_PER_BANK 32
+#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
+
+#define CYGNUS_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + (reg))
+#define CYGNUS_GPIO_SHIFT(pin) ((pin) % NGPIOS_PER_BANK)
+
+#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
+#define GPIO_DRV_STRENGTH_BITS       3
+#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
+
+/*
+ * Cygnus GPIO core
+ *
+ * @dev: pointer to device
+ * @base: I/O register base for Cygnus GPIO controller
+ * @io_ctrl: I/O register base for certain type of Cygnus GPIO controller that
+ * has the PINCONF support implemented outside of the GPIO block
+ * @lock: lock to protect access to I/O registers
+ * @gc: GPIO chip
+ * @num_banks: number of GPIO banks, each bank supports up to 32 GPIOs
+ * @pinmux_is_supported: flag to indicate this GPIO controller contains pins
+ * that can be individually muxed to GPIO
+ * @pctl: pointer to pinctrl_dev
+ * @pctldesc: pinctrl descriptor
+ */
+struct cygnus_gpio {
+	struct device *dev;
+
+	void __iomem *base;
+	void __iomem *io_ctrl;
+
+	spinlock_t lock;
+
+	struct gpio_chip gc;
+	unsigned num_banks;
+
+	bool pinmux_is_supported;
+
+	struct pinctrl_dev *pctl;
+	struct pinctrl_desc pctldesc;
+};
+
+static struct cygnus_gpio *to_cygnus_gpio(struct gpio_chip *gc)
+{
+	return container_of(gc, struct cygnus_gpio, gc);
+}
+
+/*
+ * Mapping from PINCONF pins to GPIO pins is 1-to-1
+ */
+static unsigned cygnus_pin_to_gpio(unsigned pin)
+{
+	return pin;
+}
+
+static u32 cygnus_readl(struct cygnus_gpio *chip, unsigned int offset)
+{
+	return readl(chip->base + offset);
+}
+
+static void cygnus_writel(struct cygnus_gpio *chip, unsigned int offset,
+			  u32 val)
+{
+	writel(val, chip->base + offset);
+}
+
+/**
+ *  cygnus_set_bit - set or clear one bit (corresponding to the GPIO pin) in a
+ *  Cygnus GPIO register
+ *
+ *  @cygnus_gpio: Cygnus GPIO device
+ *  @reg: register offset
+ *  @gpio: GPIO pin
+ *  @set: set or clear. 1 - set; 0 -clear
+ */
+static void cygnus_set_bit(struct cygnus_gpio *chip, unsigned int reg,
+			   unsigned gpio, int set)
+{
+	unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val;
+
+	val = cygnus_readl(chip, offset);
+	if (set)
+		val |= BIT(shift);
+	else
+		val &= ~BIT(shift);
+	cygnus_writel(chip, offset, val);
+}
+
+static int cygnus_get_bit(struct cygnus_gpio *chip, unsigned int reg,
+			  unsigned gpio)
+{
+	unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val;
+
+	val = cygnus_readl(chip, offset) & BIT(shift);
+	if (val)
+		return 1;
+	else
+		return 0;
+}
+
+static void cygnus_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+	struct gpio_chip *gc = irq_desc_get_handler_data(desc);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	struct irq_chip *irq_chip = irq_desc_get_chip(desc);
+	int i, bit;
+
+	chained_irq_enter(irq_chip, desc);
+
+	/* go through the entire GPIO banks and handle all interrupts */
+	for (i = 0; i < chip->num_banks; i++) {
+		unsigned long val = cygnus_readl(chip,
+				(i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_MSTAT_OFFSET);
+
+		for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
+			unsigned pin = NGPIOS_PER_BANK * i + bit;
+			int child_irq = irq_find_mapping(gc->irqdomain, pin);
+
+			/*
+			 * Clear the interrupt before invoking the
+			 * handler, so we do not leave any window
+			 */
+			cygnus_writel(chip, (i * GPIO_BANK_SIZE) +
+				      CYGNUS_GPIO_INT_CLR_OFFSET, BIT(bit));
+
+			generic_handle_irq(child_irq);
+		}
+	}
+
+	chained_irq_exit(irq_chip, desc);
+}
+
+
+static void cygnus_gpio_irq_ack(struct irq_data *d)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned gpio = d->hwirq;
+	unsigned int offset = CYGNUS_GPIO_REG(gpio,
+			CYGNUS_GPIO_INT_CLR_OFFSET);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val = BIT(shift);
+
+	cygnus_writel(chip, offset, val);
+}
+
+/**
+ *  cygnus_gpio_irq_set_mask - mask/unmask a GPIO interrupt
+ *
+ *  @d: IRQ chip data
+ *  @mask: mask/unmask GPIO interrupt. 0 - mask (disable); 1 - unmask (enable)
+ */
+static void cygnus_gpio_irq_set_mask(struct irq_data *d, int mask)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned gpio = d->hwirq;
+
+	cygnus_set_bit(chip, CYGNUS_GPIO_INT_MSK_OFFSET, gpio, mask);
+}
+
+static void cygnus_gpio_irq_mask(struct irq_data *d)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_gpio_irq_set_mask(d, 0);
+	spin_unlock_irqrestore(&chip->lock, flags);
+}
+
+static void cygnus_gpio_irq_unmask(struct irq_data *d)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_gpio_irq_set_mask(d, 1);
+	spin_unlock_irqrestore(&chip->lock, flags);
+}
+
+static int cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned gpio = d->hwirq;
+	int int_type = 0, dual_edge = 0, edge_lvl = 0;
+	unsigned long flags;
+
+	switch (type & IRQ_TYPE_SENSE_MASK) {
+	case IRQ_TYPE_EDGE_RISING:
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_EDGE_FALLING:
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		dual_edge = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_HIGH:
+		int_type = 1;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_LOW:
+		int_type = 1;
+		break;
+
+	default:
+		dev_err(chip->dev, "invalid GPIO IRQ type 0x%x\n",
+			type);
+		return -EINVAL;
+	}
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_set_bit(chip, CYGNUS_GPIO_IN_TYPE_OFFSET, gpio, int_type);
+	cygnus_set_bit(chip, CYGNUS_GPIO_INT_DE_OFFSET, gpio, dual_edge);
+	cygnus_set_bit(chip, CYGNUS_GPIO_INT_EDGE_OFFSET, gpio,
+		       edge_lvl);
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	dev_dbg(chip->dev,
+		"gpio:%u set int_type:%d dual_edge:%d edge_lvl:%d\n",
+		gpio, int_type, dual_edge, edge_lvl);
+
+	return 0;
+}
+
+static struct irq_chip cygnus_gpio_irq_chip = {
+	.name = "bcm-cygnus-gpio",
+	.irq_ack = cygnus_gpio_irq_ack,
+	.irq_mask = cygnus_gpio_irq_mask,
+	.irq_unmask = cygnus_gpio_irq_unmask,
+	.irq_set_type = cygnus_gpio_irq_set_type,
+};
+
+/*
+ * Request the Cygnus IOMUX pinmux controller to mux individual pins to GPIO
+ */
+static int cygnus_gpio_request(struct gpio_chip *gc, unsigned offset)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned gpio = gc->base + offset;
+
+	/* not all Cygnus GPIO pins can be muxed individually */
+	if (!chip->pinmux_is_supported)
+		return 0;
+
+	return pinctrl_request_gpio(gpio);
+}
+
+static void cygnus_gpio_free(struct gpio_chip *gc, unsigned offset)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned gpio = gc->base + offset;
+
+	if (!chip->pinmux_is_supported)
+		return;
+
+	pinctrl_free_gpio(gpio);
+}
+
+static int cygnus_gpio_direction_input(struct gpio_chip *gc, unsigned gpio)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_set_bit(chip, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 0);
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	dev_dbg(chip->dev, "gpio:%u set input\n", gpio);
+
+	return 0;
+}
+
+static int cygnus_gpio_direction_output(struct gpio_chip *gc, unsigned gpio,
+					int value)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_set_bit(chip, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 1);
+	cygnus_set_bit(chip, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	dev_dbg(chip->dev, "gpio:%u set output, value:%d\n", gpio, value);
+
+	return 0;
+}
+
+static void cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio, int value)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_set_bit(chip, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	dev_dbg(chip->dev, "gpio:%u set, value:%d\n", gpio, value);
+}
+
+static int cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned int offset = CYGNUS_GPIO_REG(gpio,
+					      CYGNUS_GPIO_DATA_IN_OFFSET);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+
+	return !!(cygnus_readl(chip, offset) & BIT(shift));
+}
+
+static int cygnus_get_groups_count(struct pinctrl_dev *pctldev)
+{
+	return 1;
+}
+
+/*
+ * Only one group: "gpio_grp", since this local pinctrl device only performs
+ * GPIO specific PINCONF configurations
+ */
+static const char *cygnus_get_group_name(struct pinctrl_dev *pctldev,
+					 unsigned selector)
+{
+	return "gpio_grp";
+}
+
+static const struct pinctrl_ops cygnus_pctrl_ops = {
+	.get_groups_count = cygnus_get_groups_count,
+	.get_group_name = cygnus_get_group_name,
+	.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
+	.dt_free_map = pinctrl_utils_dt_free_map,
+};
+
+static int cygnus_gpio_set_pull(struct cygnus_gpio *chip, unsigned gpio,
+				int disable, int pull_up)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+
+	if (disable) {
+		cygnus_set_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio, 0);
+	} else {
+		cygnus_set_bit(chip, CYGNUS_GPIO_PAD_RES_OFFSET, gpio,
+			       pull_up);
+		cygnus_set_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio, 1);
+	}
+
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	dev_dbg(chip->dev, "gpio:%u set pullup:%d\n", gpio, pull_up);
+
+	return 0;
+}
+
+static void cygnus_gpio_get_pull(struct cygnus_gpio *chip, unsigned gpio,
+				 int *disable, int *pull_up)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	*disable = !cygnus_get_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio);
+	*pull_up = cygnus_get_bit(chip, CYGNUS_GPIO_PAD_RES_OFFSET, gpio);
+	spin_unlock_irqrestore(&chip->lock, flags);
+}
+
+static int cygnus_gpio_set_strength(struct cygnus_gpio *chip, unsigned gpio,
+				    unsigned strength)
+{
+	void __iomem *base;
+	unsigned int i, offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	/* make sure drive strength is supported */
+	if (strength < 2 ||  strength > 16 || (strength % 2))
+		return -ENOTSUPP;
+
+	if (chip->io_ctrl) {
+		base = chip->io_ctrl;
+		offset = CYGNUS_GPIO_DRV0_CTRL_OFFSET;
+	} else {
+		base = chip->base;
+		offset = CYGNUS_GPIO_REG(gpio,
+					 CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET);
+	}
+
+	shift = CYGNUS_GPIO_SHIFT(gpio);
+
+	dev_dbg(chip->dev, "gpio:%u set drive strength:%d mA\n", gpio,
+		strength);
+
+	spin_lock_irqsave(&chip->lock, flags);
+	strength = (strength / 2) - 1;
+	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
+		val = readl(base + offset);
+		val &= ~BIT(shift);
+		val |= ((strength >> i) & 0x1) << shift;
+		writel(val, base + offset);
+		offset += 4;
+	}
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	return 0;
+}
+
+static int cygnus_gpio_get_strength(struct cygnus_gpio *chip, unsigned gpio,
+				    u16 *strength)
+{
+	void __iomem *base;
+	unsigned int i, offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	if (chip->io_ctrl) {
+		base = chip->io_ctrl;
+		offset = CYGNUS_GPIO_DRV0_CTRL_OFFSET;
+	} else {
+		base = chip->base;
+		offset = CYGNUS_GPIO_REG(gpio,
+					 CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET);
+	}
+
+	shift = CYGNUS_GPIO_SHIFT(gpio);
+
+	spin_lock_irqsave(&chip->lock, flags);
+	*strength = 0;
+	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
+		val = readl(base + offset) & BIT(shift);
+		val >>= shift;
+		*strength += (val << i);
+		offset += 4;
+	}
+
+	/* convert to mA */
+	*strength = (*strength + 1) * 2;
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	return 0;
+}
+
+static int cygnus_pin_config_get(struct pinctrl_dev *pctldev, unsigned pin,
+				 unsigned long *config)
+{
+	struct cygnus_gpio *chip = pinctrl_dev_get_drvdata(pctldev);
+	enum pin_config_param param = pinconf_to_config_param(*config);
+	unsigned gpio = cygnus_pin_to_gpio(pin);
+	u16 arg;
+	int disable, pull_up, ret;
+
+	switch (param) {
+	case PIN_CONFIG_BIAS_DISABLE:
+		cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
+		if (disable)
+			return 0;
+		else
+			return -EINVAL;
+
+	case PIN_CONFIG_BIAS_PULL_UP:
+		cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
+		if (!disable && pull_up)
+			return 0;
+		else
+			return -EINVAL;
+
+	case PIN_CONFIG_BIAS_PULL_DOWN:
+		cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
+		if (!disable && !pull_up)
+			return 0;
+		else
+			return -EINVAL;
+
+	case PIN_CONFIG_DRIVE_STRENGTH:
+		ret = cygnus_gpio_get_strength(chip, gpio, &arg);
+		if (ret)
+			return ret;
+		else
+			*config = pinconf_to_config_packed(param, arg);
+
+		return 0;
+
+	default:
+		return -ENOTSUPP;
+	}
+
+	return -ENOTSUPP;
+}
+
+static int cygnus_pin_config_set(struct pinctrl_dev *pctldev, unsigned pin,
+				 unsigned long *configs, unsigned num_configs)
+{
+	struct cygnus_gpio *chip = pinctrl_dev_get_drvdata(pctldev);
+	enum pin_config_param param;
+	u16 arg;
+	unsigned i, gpio = cygnus_pin_to_gpio(pin);
+	int ret = -ENOTSUPP;
+
+	for (i = 0; i < num_configs; i++) {
+		param = pinconf_to_config_param(configs[i]);
+		arg = pinconf_to_config_argument(configs[i]);
+
+		switch (param) {
+		case PIN_CONFIG_BIAS_DISABLE:
+			ret = cygnus_gpio_set_pull(chip, gpio, 1, 0);
+			if (ret < 0)
+				goto out;
+			break;
+
+		case PIN_CONFIG_BIAS_PULL_UP:
+			ret = cygnus_gpio_set_pull(chip, gpio, 0, 1);
+			if (ret < 0)
+				goto out;
+			break;
+
+		case PIN_CONFIG_BIAS_PULL_DOWN:
+			ret = cygnus_gpio_set_pull(chip, gpio, 0, 0);
+			if (ret < 0)
+				goto out;
+			break;
+
+		case PIN_CONFIG_DRIVE_STRENGTH:
+			ret = cygnus_gpio_set_strength(chip, gpio, arg);
+			if (ret < 0)
+				goto out;
+			break;
+
+		default:
+			dev_err(chip->dev, "invalid configuration\n");
+			return -ENOTSUPP;
+		}
+	} /* for each config */
+
+out:
+	return ret;
+}
+
+static const struct pinconf_ops cygnus_pconf_ops = {
+	.is_generic = true,
+	.pin_config_get = cygnus_pin_config_get,
+	.pin_config_set = cygnus_pin_config_set,
+};
+
+/*
+ * Map a GPIO in the local gpio_chip pin space to a pin in the Cygnus IOMUX
+ * pinctrl pin space
+ */
+struct cygnus_gpio_pin_range {
+	unsigned offset;
+	unsigned pin_base;
+	unsigned num_pins;
+};
+
+#define CYGNUS_PINRANGE(o, p, n) { .offset = o, .pin_base = p, .num_pins = n }
+
+/*
+ * Pin mapping table for mapping local GPIO pins to Cygnus IOMUX pinctrl pins
+ */
+static const struct cygnus_gpio_pin_range cygnus_gpio_pintable[] = {
+	CYGNUS_PINRANGE(0, 42, 1),
+	CYGNUS_PINRANGE(1, 44, 3),
+	CYGNUS_PINRANGE(4, 48, 1),
+	CYGNUS_PINRANGE(5, 50, 3),
+	CYGNUS_PINRANGE(8, 126, 1),
+	CYGNUS_PINRANGE(9, 155, 1),
+	CYGNUS_PINRANGE(10, 152, 1),
+	CYGNUS_PINRANGE(11, 154, 1),
+	CYGNUS_PINRANGE(12, 153, 1),
+	CYGNUS_PINRANGE(13, 127, 3),
+	CYGNUS_PINRANGE(16, 140, 1),
+	CYGNUS_PINRANGE(17, 145, 7),
+	CYGNUS_PINRANGE(24, 130, 10),
+	CYGNUS_PINRANGE(34, 141, 4),
+	CYGNUS_PINRANGE(38, 54, 1),
+	CYGNUS_PINRANGE(39, 56, 3),
+	CYGNUS_PINRANGE(42, 60, 3),
+	CYGNUS_PINRANGE(45, 64, 3),
+	CYGNUS_PINRANGE(48, 68, 2),
+	CYGNUS_PINRANGE(50, 84, 6),
+	CYGNUS_PINRANGE(56, 94, 6),
+	CYGNUS_PINRANGE(62, 72, 1),
+	CYGNUS_PINRANGE(63, 70, 1),
+	CYGNUS_PINRANGE(64, 80, 1),
+	CYGNUS_PINRANGE(65, 74, 3),
+	CYGNUS_PINRANGE(68, 78, 1),
+	CYGNUS_PINRANGE(69, 82, 1),
+	CYGNUS_PINRANGE(70, 156, 17),
+	CYGNUS_PINRANGE(87, 104, 12),
+	CYGNUS_PINRANGE(99, 102, 2),
+	CYGNUS_PINRANGE(101, 90, 4),
+	CYGNUS_PINRANGE(105, 116, 10),
+	CYGNUS_PINRANGE(123, 11, 1),
+	CYGNUS_PINRANGE(124, 38, 4),
+	CYGNUS_PINRANGE(128, 43, 1),
+	CYGNUS_PINRANGE(129, 47, 1),
+	CYGNUS_PINRANGE(130, 49, 1),
+	CYGNUS_PINRANGE(131, 53, 1),
+	CYGNUS_PINRANGE(132, 55, 1),
+	CYGNUS_PINRANGE(133, 59, 1),
+	CYGNUS_PINRANGE(134, 63, 1),
+	CYGNUS_PINRANGE(135, 67, 1),
+	CYGNUS_PINRANGE(136, 71, 1),
+	CYGNUS_PINRANGE(137, 73, 1),
+	CYGNUS_PINRANGE(138, 77, 1),
+	CYGNUS_PINRANGE(139, 79, 1),
+	CYGNUS_PINRANGE(140, 81, 1),
+	CYGNUS_PINRANGE(141, 83, 1),
+	CYGNUS_PINRANGE(142, 10, 1)
+};
+
+/*
+ * The Cygnus IOMUX controller mainly supports group based mux configuration,
+ * but certain pins can be muxed to GPIO individually. Only the ASIU GPIO
+ * controller can support this, so it's an optional configuration
+ *
+ * Return -ENODEV means no support and that's fine
+ */
+static int cygnus_gpio_pinmux_add_range(struct cygnus_gpio *chip)
+{
+	struct device_node *node = chip->dev->of_node;
+	struct device_node *pinmux_node;
+	struct platform_device *pinmux_pdev;
+	struct gpio_chip *gc = &chip->gc;
+	int i, ret;
+
+	/* parse DT to find the phandle to the pinmux controller */
+	pinmux_node = of_parse_phandle(node, "pinmux", 0);
+	if (!pinmux_node)
+		return -ENODEV;
+
+	pinmux_pdev = of_find_device_by_node(pinmux_node);
+	if (!pinmux_pdev) {
+		dev_err(chip->dev, "failed to get pinmux device\n");
+		return -EINVAL;
+	}
+
+	/* now need to create the mapping between local GPIO and PINMUX pins */
+	for (i = 0; i < ARRAY_SIZE(cygnus_gpio_pintable); i++) {
+		ret = gpiochip_add_pin_range(gc, dev_name(&pinmux_pdev->dev),
+					     cygnus_gpio_pintable[i].offset,
+					     cygnus_gpio_pintable[i].pin_base,
+					     cygnus_gpio_pintable[i].num_pins);
+		if (ret) {
+			dev_err(chip->dev, "unable to add GPIO pin range\n");
+			goto err_put_device;
+		}
+	}
+
+	chip->pinmux_is_supported = true;
+
+	/* no need for pinmux_pdev device reference anymore */
+	put_device(&pinmux_pdev->dev);
+	return 0;
+
+err_put_device:
+	put_device(&pinmux_pdev->dev);
+	gpiochip_remove_pin_ranges(gc);
+	return ret;
+}
+
+static void cygnus_gpio_pinmux_remove_range(struct cygnus_gpio *chip)
+{
+	struct gpio_chip *gc = &chip->gc;
+
+	if (chip->pinmux_is_supported)
+		gpiochip_remove_pin_ranges(gc);
+}
+
+/*
+ * Cygnus GPIO controller supports some PINCONF related configurations such as
+ * pull up, pull down, and drive strength, when the pin is configured to GPIO
+ *
+ * Here a local pinctrl device is created with simple 1-to-1 pin mapping to the
+ * local GPIO pins
+ */
+static int cygnus_gpio_register_pinconf(struct cygnus_gpio *chip)
+{
+	struct pinctrl_desc *pctldesc = &chip->pctldesc;
+	struct pinctrl_pin_desc *pins;
+	struct gpio_chip *gc = &chip->gc;
+	int i;
+
+	pins = devm_kcalloc(chip->dev, gc->ngpio, sizeof(*pins), GFP_KERNEL);
+	if (!pins)
+		return -ENOMEM;
+
+	for (i = 0; i < gc->ngpio; i++) {
+		pins[i].number = i;
+		pins[i].name = devm_kasprintf(chip->dev, GFP_KERNEL,
+					      "gpio-%d", i);
+		if (!pins[i].name)
+			return -ENOMEM;
+	}
+
+	pctldesc->name = dev_name(chip->dev);
+	pctldesc->pctlops = &cygnus_pctrl_ops;
+	pctldesc->pins = pins;
+	pctldesc->npins = gc->ngpio;
+	pctldesc->confops = &cygnus_pconf_ops;
+
+	chip->pctl = pinctrl_register(pctldesc, chip->dev, chip);
+	if (!chip->pctl) {
+		dev_err(chip->dev, "unable to register pinctrl device\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static void cygnus_gpio_unregister_pinconf(struct cygnus_gpio *chip)
+{
+	if (chip->pctl)
+		pinctrl_unregister(chip->pctl);
+}
+
+static const struct of_device_id cygnus_gpio_of_match[] = {
+	{ .compatible = "brcm,cygnus-gpio" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, cygnus_gpio_of_match);
+
+static int cygnus_gpio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+	struct cygnus_gpio *chip;
+	struct gpio_chip *gc;
+	u32 ngpios;
+	int irq, ret;
+
+	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
+	chip->dev = dev;
+	platform_set_drvdata(pdev, chip);
+
+	if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
+		dev_err(dev, "missing ngpios DT property\n");
+		return -ENODEV;
+	}
+	chip->num_banks = (ngpios + NGPIOS_PER_BANK - 1) / NGPIOS_PER_BANK;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	chip->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(chip->base)) {
+		dev_err(dev, "unable to map I/O memory\n");
+		return PTR_ERR(chip->base);
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (res) {
+		chip->io_ctrl = devm_ioremap_resource(dev, res);
+		if (IS_ERR(chip->io_ctrl)) {
+			dev_err(dev, "unable to map I/O memory\n");
+			return PTR_ERR(chip->io_ctrl);
+		}
+	}
+
+	spin_lock_init(&chip->lock);
+
+	gc = &chip->gc;
+	gc->base = -1;
+	gc->ngpio = ngpios;
+	gc->label = dev_name(dev);
+	gc->dev = dev;
+	gc->of_node = dev->of_node;
+	gc->request = cygnus_gpio_request;
+	gc->free = cygnus_gpio_free;
+	gc->direction_input = cygnus_gpio_direction_input;
+	gc->direction_output = cygnus_gpio_direction_output;
+	gc->set = cygnus_gpio_set;
+	gc->get = cygnus_gpio_get;
+
+	ret = gpiochip_add(gc);
+	if (ret < 0) {
+		dev_err(dev, "unable to add GPIO chip\n");
+		return ret;
+	}
+
+	ret = cygnus_gpio_pinmux_add_range(chip);
+	if (ret && ret != -ENODEV) {
+		dev_err(dev, "unable to add GPIO pin range\n");
+		goto err_rm_gpiochip;
+	}
+
+	ret = cygnus_gpio_register_pinconf(chip);
+	if (ret) {
+		dev_err(dev, "unable to register pinconf\n");
+		goto err_rm_range;
+	}
+
+	/* optional GPIO interrupt support */
+	irq = platform_get_irq(pdev, 0);
+	if (irq) {
+		ret = gpiochip_irqchip_add(gc, &cygnus_gpio_irq_chip, 0,
+					   handle_simple_irq, IRQ_TYPE_NONE);
+		if (ret) {
+			dev_err(dev, "no GPIO irqchip\n");
+			goto err_unregister_pinconf;
+		}
+
+		gpiochip_set_chained_irqchip(gc, &cygnus_gpio_irq_chip, irq,
+					     cygnus_gpio_irq_handler);
+	}
+
+	return 0;
+
+err_unregister_pinconf:
+	cygnus_gpio_unregister_pinconf(chip);
+
+err_rm_range:
+	cygnus_gpio_pinmux_remove_range(chip);
+
+err_rm_gpiochip:
+	gpiochip_remove(gc);
+
+	return ret;
+}
+
+static struct platform_driver cygnus_gpio_driver = {
+	.driver = {
+		.name = "cygnus-gpio",
+		.of_match_table = cygnus_gpio_of_match,
+		.suppress_bind_attrs = true,
+	},
+	.probe = cygnus_gpio_probe,
+};
+
+static int __init cygnus_gpio_init(void)
+{
+	return platform_driver_probe(&cygnus_gpio_driver, cygnus_gpio_probe);
+}
+arch_initcall_sync(cygnus_gpio_init);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus GPIO Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v8 2/4] pinctrl: cygnus: add gpio/pinconf driver

[Ray Jui]

This adds the initial support of the Broadcom Cygnus GPIO/PINCONF driver
that supports all 3 GPIO controllers on Cygnus including the ASIU GPIO
controller, the chipCommonG GPIO controller, and the always-on GPIO
controller. Basic PINCONF configurations such as bias pull up/down, and
drive strength are also supported in this driver.

Pins from the ASIU GPIO controller can be individually muxed to GPIO
function, through interaction with the Cygnus IOMUX controller

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/pinctrl/bcm/Kconfig               |   22 +
 drivers/pinctrl/bcm/Makefile              |    1 +
 drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c |  907 +++++++++++++++++++++++++++++
 3 files changed, 930 insertions(+)
 create mode 100644 drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c

diff --git a/drivers/pinctrl/bcm/Kconfig b/drivers/pinctrl/bcm/Kconfig
index eb13201..cd11d4d 100644
--- a/drivers/pinctrl/bcm/Kconfig
+++ b/drivers/pinctrl/bcm/Kconfig
@@ -20,6 +20,28 @@ config PINCTRL_BCM2835
 	select PINMUX
 	select PINCONF
 
+config PINCTRL_CYGNUS_GPIO
+	bool "Broadcom Cygnus GPIO (with PINCONF) driver"
+	depends on OF_GPIO && ARCH_BCM_CYGNUS
+	select GPIOLIB_IRQCHIP
+	select PINCONF
+	select GENERIC_PINCONF
+	default ARCH_BCM_CYGNUS
+	help
+	  Say yes here to enable the Broadcom Cygnus GPIO driver.
+
+	  The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
+	  GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
+	  the always-ON GPIO controller (CRMU/AON). All 3 GPIO controllers are
+	  supported by this driver.
+
+	  All 3 Cygnus GPIO controllers support basic PINCONF functions such
+	  as bias pull up, pull down, and drive strength configurations, when
+	  these pins are muxed to GPIO.
+
+	  Pins from the ASIU GPIO can be individually muxed to GPIO function,
+	  through interaction with the Cygnus IOMUX controller.
+
 config PINCTRL_CYGNUS_MUX
 	bool "Broadcom Cygnus IOMUX driver"
 	depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
diff --git a/drivers/pinctrl/bcm/Makefile b/drivers/pinctrl/bcm/Makefile
index bb6beb6..2b2f70e 100644
--- a/drivers/pinctrl/bcm/Makefile
+++ b/drivers/pinctrl/bcm/Makefile
@@ -2,4 +2,5 @@
 
 obj-$(CONFIG_PINCTRL_BCM281XX)		+= pinctrl-bcm281xx.o
 obj-$(CONFIG_PINCTRL_BCM2835)		+= pinctrl-bcm2835.o
+obj-$(CONFIG_PINCTRL_CYGNUS_GPIO)	+= pinctrl-cygnus-gpio.o
 obj-$(CONFIG_PINCTRL_CYGNUS_MUX)	+= pinctrl-cygnus-mux.o
diff --git a/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c b/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c
new file mode 100644
index 0000000..1feab0c
--- /dev/null
+++ b/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c
@@ -0,0 +1,907 @@
+/*
+ * Copyright (C) 2014-2015 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * This file contains the Broadcom Cygnus GPIO driver that supports 3
+ * GPIO controllers on Cygnus including the ASIU GPIO controller, the
+ * chipCommonG GPIO controller, and the always-on GPIO controller. Basic
+ * PINCONF such as bias pull up/down, and drive strength are also supported
+ * in this driver.
+ *
+ * Pins from the ASIU GPIO can be individually muxed to GPIO function,
+ * through the interaction with the Cygnus IOMUX controller
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/ioport.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+
+#include "../pinctrl-utils.h"
+
+#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
+#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
+#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
+#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
+#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
+#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
+#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
+#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
+#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
+#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
+#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
+#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
+
+/* drive strength control for ASIU GPIO */
+#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
+
+/* drive strength control for CCM/CRMU (AON) GPIO */
+#define CYGNUS_GPIO_DRV0_CTRL_OFFSET  0x00
+
+#define GPIO_BANK_SIZE 0x200
+#define NGPIOS_PER_BANK 32
+#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
+
+#define CYGNUS_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + (reg))
+#define CYGNUS_GPIO_SHIFT(pin) ((pin) % NGPIOS_PER_BANK)
+
+#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
+#define GPIO_DRV_STRENGTH_BITS       3
+#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
+
+/*
+ * Cygnus GPIO core
+ *
+ * @dev: pointer to device
+ * @base: I/O register base for Cygnus GPIO controller
+ * @io_ctrl: I/O register base for certain type of Cygnus GPIO controller that
+ * has the PINCONF support implemented outside of the GPIO block
+ * @lock: lock to protect access to I/O registers
+ * @gc: GPIO chip
+ * @num_banks: number of GPIO banks, each bank supports up to 32 GPIOs
+ * @pinmux_is_supported: flag to indicate this GPIO controller contains pins
+ * that can be individually muxed to GPIO
+ * @pctl: pointer to pinctrl_dev
+ * @pctldesc: pinctrl descriptor
+ */
+struct cygnus_gpio {
+	struct device *dev;
+
+	void __iomem *base;
+	void __iomem *io_ctrl;
+
+	spinlock_t lock;
+
+	struct gpio_chip gc;
+	unsigned num_banks;
+
+	bool pinmux_is_supported;
+
+	struct pinctrl_dev *pctl;
+	struct pinctrl_desc pctldesc;
+};
+
+static struct cygnus_gpio *to_cygnus_gpio(struct gpio_chip *gc)
+{
+	return container_of(gc, struct cygnus_gpio, gc);
+}
+
+/*
+ * Mapping from PINCONF pins to GPIO pins is 1-to-1
+ */
+static unsigned cygnus_pin_to_gpio(unsigned pin)
+{
+	return pin;
+}
+
+static u32 cygnus_readl(struct cygnus_gpio *chip, unsigned int offset)
+{
+	return readl(chip->base + offset);
+}
+
+static void cygnus_writel(struct cygnus_gpio *chip, unsigned int offset,
+			  u32 val)
+{
+	writel(val, chip->base + offset);
+}
+
+/**
+ *  cygnus_set_bit - set or clear one bit (corresponding to the GPIO pin) in a
+ *  Cygnus GPIO register
+ *
+ *  @cygnus_gpio: Cygnus GPIO device
+ *  @reg: register offset
+ *  @gpio: GPIO pin
+ *  @set: set or clear. 1 - set; 0 -clear
+ */
+static void cygnus_set_bit(struct cygnus_gpio *chip, unsigned int reg,
+			   unsigned gpio, int set)
+{
+	unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val;
+
+	val = cygnus_readl(chip, offset);
+	if (set)
+		val |= BIT(shift);
+	else
+		val &= ~BIT(shift);
+	cygnus_writel(chip, offset, val);
+}
+
+static int cygnus_get_bit(struct cygnus_gpio *chip, unsigned int reg,
+			  unsigned gpio)
+{
+	unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val;
+
+	val = cygnus_readl(chip, offset) & BIT(shift);
+	if (val)
+		return 1;
+	else
+		return 0;
+}
+
+static void cygnus_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+	struct gpio_chip *gc = irq_desc_get_handler_data(desc);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	struct irq_chip *irq_chip = irq_desc_get_chip(desc);
+	int i, bit;
+
+	chained_irq_enter(irq_chip, desc);
+
+	/* go through the entire GPIO banks and handle all interrupts */
+	for (i = 0; i < chip->num_banks; i++) {
+		unsigned long val = cygnus_readl(chip,
+				(i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_MSTAT_OFFSET);
+
+		for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
+			unsigned pin = NGPIOS_PER_BANK * i + bit;
+			int child_irq = irq_find_mapping(gc->irqdomain, pin);
+
+			/*
+			 * Clear the interrupt before invoking the
+			 * handler, so we do not leave any window
+			 */
+			cygnus_writel(chip, (i * GPIO_BANK_SIZE) +
+				      CYGNUS_GPIO_INT_CLR_OFFSET, BIT(bit));
+
+			generic_handle_irq(child_irq);
+		}
+	}
+
+	chained_irq_exit(irq_chip, desc);
+}
+
+
+static void cygnus_gpio_irq_ack(struct irq_data *d)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned gpio = d->hwirq;
+	unsigned int offset = CYGNUS_GPIO_REG(gpio,
+			CYGNUS_GPIO_INT_CLR_OFFSET);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val = BIT(shift);
+
+	cygnus_writel(chip, offset, val);
+}
+
+/**
+ *  cygnus_gpio_irq_set_mask - mask/unmask a GPIO interrupt
+ *
+ *  @d: IRQ chip data
+ *  @mask: mask/unmask GPIO interrupt. 0 - mask (disable); 1 - unmask (enable)
+ */
+static void cygnus_gpio_irq_set_mask(struct irq_data *d, int mask)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned gpio = d->hwirq;
+
+	cygnus_set_bit(chip, CYGNUS_GPIO_INT_MSK_OFFSET, gpio, mask);
+}
+
+static void cygnus_gpio_irq_mask(struct irq_data *d)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_gpio_irq_set_mask(d, 0);
+	spin_unlock_irqrestore(&chip->lock, flags);
+}
+
+static void cygnus_gpio_irq_unmask(struct irq_data *d)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_gpio_irq_set_mask(d, 1);
+	spin_unlock_irqrestore(&chip->lock, flags);
+}
+
+static int cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned gpio = d->hwirq;
+	int int_type = 0, dual_edge = 0, edge_lvl = 0;
+	unsigned long flags;
+
+	switch (type & IRQ_TYPE_SENSE_MASK) {
+	case IRQ_TYPE_EDGE_RISING:
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_EDGE_FALLING:
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		dual_edge = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_HIGH:
+		int_type = 1;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_LOW:
+		int_type = 1;
+		break;
+
+	default:
+		dev_err(chip->dev, "invalid GPIO IRQ type 0x%x\n",
+			type);
+		return -EINVAL;
+	}
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_set_bit(chip, CYGNUS_GPIO_IN_TYPE_OFFSET, gpio, int_type);
+	cygnus_set_bit(chip, CYGNUS_GPIO_INT_DE_OFFSET, gpio, dual_edge);
+	cygnus_set_bit(chip, CYGNUS_GPIO_INT_EDGE_OFFSET, gpio,
+		       edge_lvl);
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	dev_dbg(chip->dev,
+		"gpio:%u set int_type:%d dual_edge:%d edge_lvl:%d\n",
+		gpio, int_type, dual_edge, edge_lvl);
+
+	return 0;
+}
+
+static struct irq_chip cygnus_gpio_irq_chip = {
+	.name = "bcm-cygnus-gpio",
+	.irq_ack = cygnus_gpio_irq_ack,
+	.irq_mask = cygnus_gpio_irq_mask,
+	.irq_unmask = cygnus_gpio_irq_unmask,
+	.irq_set_type = cygnus_gpio_irq_set_type,
+};
+
+/*
+ * Request the Cygnus IOMUX pinmux controller to mux individual pins to GPIO
+ */
+static int cygnus_gpio_request(struct gpio_chip *gc, unsigned offset)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned gpio = gc->base + offset;
+
+	/* not all Cygnus GPIO pins can be muxed individually */
+	if (!chip->pinmux_is_supported)
+		return 0;
+
+	return pinctrl_request_gpio(gpio);
+}
+
+static void cygnus_gpio_free(struct gpio_chip *gc, unsigned offset)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned gpio = gc->base + offset;
+
+	if (!chip->pinmux_is_supported)
+		return;
+
+	pinctrl_free_gpio(gpio);
+}
+
+static int cygnus_gpio_direction_input(struct gpio_chip *gc, unsigned gpio)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_set_bit(chip, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 0);
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	dev_dbg(chip->dev, "gpio:%u set input\n", gpio);
+
+	return 0;
+}
+
+static int cygnus_gpio_direction_output(struct gpio_chip *gc, unsigned gpio,
+					int value)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_set_bit(chip, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 1);
+	cygnus_set_bit(chip, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	dev_dbg(chip->dev, "gpio:%u set output, value:%d\n", gpio, value);
+
+	return 0;
+}
+
+static void cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio, int value)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_set_bit(chip, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	dev_dbg(chip->dev, "gpio:%u set, value:%d\n", gpio, value);
+}
+
+static int cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned int offset = CYGNUS_GPIO_REG(gpio,
+					      CYGNUS_GPIO_DATA_IN_OFFSET);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+
+	return !!(cygnus_readl(chip, offset) & BIT(shift));
+}
+
+static int cygnus_get_groups_count(struct pinctrl_dev *pctldev)
+{
+	return 1;
+}
+
+/*
+ * Only one group: "gpio_grp", since this local pinctrl device only performs
+ * GPIO specific PINCONF configurations
+ */
+static const char *cygnus_get_group_name(struct pinctrl_dev *pctldev,
+					 unsigned selector)
+{
+	return "gpio_grp";
+}
+
+static const struct pinctrl_ops cygnus_pctrl_ops = {
+	.get_groups_count = cygnus_get_groups_count,
+	.get_group_name = cygnus_get_group_name,
+	.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
+	.dt_free_map = pinctrl_utils_dt_free_map,
+};
+
+static int cygnus_gpio_set_pull(struct cygnus_gpio *chip, unsigned gpio,
+				int disable, int pull_up)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+
+	if (disable) {
+		cygnus_set_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio, 0);
+	} else {
+		cygnus_set_bit(chip, CYGNUS_GPIO_PAD_RES_OFFSET, gpio,
+			       pull_up);
+		cygnus_set_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio, 1);
+	}
+
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	dev_dbg(chip->dev, "gpio:%u set pullup:%d\n", gpio, pull_up);
+
+	return 0;
+}
+
+static void cygnus_gpio_get_pull(struct cygnus_gpio *chip, unsigned gpio,
+				 int *disable, int *pull_up)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	*disable = !cygnus_get_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio);
+	*pull_up = cygnus_get_bit(chip, CYGNUS_GPIO_PAD_RES_OFFSET, gpio);
+	spin_unlock_irqrestore(&chip->lock, flags);
+}
+
+static int cygnus_gpio_set_strength(struct cygnus_gpio *chip, unsigned gpio,
+				    unsigned strength)
+{
+	void __iomem *base;
+	unsigned int i, offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	/* make sure drive strength is supported */
+	if (strength < 2 ||  strength > 16 || (strength % 2))
+		return -ENOTSUPP;
+
+	if (chip->io_ctrl) {
+		base = chip->io_ctrl;
+		offset = CYGNUS_GPIO_DRV0_CTRL_OFFSET;
+	} else {
+		base = chip->base;
+		offset = CYGNUS_GPIO_REG(gpio,
+					 CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET);
+	}
+
+	shift = CYGNUS_GPIO_SHIFT(gpio);
+
+	dev_dbg(chip->dev, "gpio:%u set drive strength:%d mA\n", gpio,
+		strength);
+
+	spin_lock_irqsave(&chip->lock, flags);
+	strength = (strength / 2) - 1;
+	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
+		val = readl(base + offset);
+		val &= ~BIT(shift);
+		val |= ((strength >> i) & 0x1) << shift;
+		writel(val, base + offset);
+		offset += 4;
+	}
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	return 0;
+}
+
+static int cygnus_gpio_get_strength(struct cygnus_gpio *chip, unsigned gpio,
+				    u16 *strength)
+{
+	void __iomem *base;
+	unsigned int i, offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	if (chip->io_ctrl) {
+		base = chip->io_ctrl;
+		offset = CYGNUS_GPIO_DRV0_CTRL_OFFSET;
+	} else {
+		base = chip->base;
+		offset = CYGNUS_GPIO_REG(gpio,
+					 CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET);
+	}
+
+	shift = CYGNUS_GPIO_SHIFT(gpio);
+
+	spin_lock_irqsave(&chip->lock, flags);
+	*strength = 0;
+	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
+		val = readl(base + offset) & BIT(shift);
+		val >>= shift;
+		*strength += (val << i);
+		offset += 4;
+	}
+
+	/* convert to mA */
+	*strength = (*strength + 1) * 2;
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	return 0;
+}
+
+static int cygnus_pin_config_get(struct pinctrl_dev *pctldev, unsigned pin,
+				 unsigned long *config)
+{
+	struct cygnus_gpio *chip = pinctrl_dev_get_drvdata(pctldev);
+	enum pin_config_param param = pinconf_to_config_param(*config);
+	unsigned gpio = cygnus_pin_to_gpio(pin);
+	u16 arg;
+	int disable, pull_up, ret;
+
+	switch (param) {
+	case PIN_CONFIG_BIAS_DISABLE:
+		cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
+		if (disable)
+			return 0;
+		else
+			return -EINVAL;
+
+	case PIN_CONFIG_BIAS_PULL_UP:
+		cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
+		if (!disable && pull_up)
+			return 0;
+		else
+			return -EINVAL;
+
+	case PIN_CONFIG_BIAS_PULL_DOWN:
+		cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
+		if (!disable && !pull_up)
+			return 0;
+		else
+			return -EINVAL;
+
+	case PIN_CONFIG_DRIVE_STRENGTH:
+		ret = cygnus_gpio_get_strength(chip, gpio, &arg);
+		if (ret)
+			return ret;
+		else
+			*config = pinconf_to_config_packed(param, arg);
+
+		return 0;
+
+	default:
+		return -ENOTSUPP;
+	}
+
+	return -ENOTSUPP;
+}
+
+static int cygnus_pin_config_set(struct pinctrl_dev *pctldev, unsigned pin,
+				 unsigned long *configs, unsigned num_configs)
+{
+	struct cygnus_gpio *chip = pinctrl_dev_get_drvdata(pctldev);
+	enum pin_config_param param;
+	u16 arg;
+	unsigned i, gpio = cygnus_pin_to_gpio(pin);
+	int ret = -ENOTSUPP;
+
+	for (i = 0; i < num_configs; i++) {
+		param = pinconf_to_config_param(configs[i]);
+		arg = pinconf_to_config_argument(configs[i]);
+
+		switch (param) {
+		case PIN_CONFIG_BIAS_DISABLE:
+			ret = cygnus_gpio_set_pull(chip, gpio, 1, 0);
+			if (ret < 0)
+				goto out;
+			break;
+
+		case PIN_CONFIG_BIAS_PULL_UP:
+			ret = cygnus_gpio_set_pull(chip, gpio, 0, 1);
+			if (ret < 0)
+				goto out;
+			break;
+
+		case PIN_CONFIG_BIAS_PULL_DOWN:
+			ret = cygnus_gpio_set_pull(chip, gpio, 0, 0);
+			if (ret < 0)
+				goto out;
+			break;
+
+		case PIN_CONFIG_DRIVE_STRENGTH:
+			ret = cygnus_gpio_set_strength(chip, gpio, arg);
+			if (ret < 0)
+				goto out;
+			break;
+
+		default:
+			dev_err(chip->dev, "invalid configuration\n");
+			return -ENOTSUPP;
+		}
+	} /* for each config */
+
+out:
+	return ret;
+}
+
+static const struct pinconf_ops cygnus_pconf_ops = {
+	.is_generic = true,
+	.pin_config_get = cygnus_pin_config_get,
+	.pin_config_set = cygnus_pin_config_set,
+};
+
+/*
+ * Map a GPIO in the local gpio_chip pin space to a pin in the Cygnus IOMUX
+ * pinctrl pin space
+ */
+struct cygnus_gpio_pin_range {
+	unsigned offset;
+	unsigned pin_base;
+	unsigned num_pins;
+};
+
+#define CYGNUS_PINRANGE(o, p, n) { .offset = o, .pin_base = p, .num_pins = n }
+
+/*
+ * Pin mapping table for mapping local GPIO pins to Cygnus IOMUX pinctrl pins
+ */
+static const struct cygnus_gpio_pin_range cygnus_gpio_pintable[] = {
+	CYGNUS_PINRANGE(0, 42, 1),
+	CYGNUS_PINRANGE(1, 44, 3),
+	CYGNUS_PINRANGE(4, 48, 1),
+	CYGNUS_PINRANGE(5, 50, 3),
+	CYGNUS_PINRANGE(8, 126, 1),
+	CYGNUS_PINRANGE(9, 155, 1),
+	CYGNUS_PINRANGE(10, 152, 1),
+	CYGNUS_PINRANGE(11, 154, 1),
+	CYGNUS_PINRANGE(12, 153, 1),
+	CYGNUS_PINRANGE(13, 127, 3),
+	CYGNUS_PINRANGE(16, 140, 1),
+	CYGNUS_PINRANGE(17, 145, 7),
+	CYGNUS_PINRANGE(24, 130, 10),
+	CYGNUS_PINRANGE(34, 141, 4),
+	CYGNUS_PINRANGE(38, 54, 1),
+	CYGNUS_PINRANGE(39, 56, 3),
+	CYGNUS_PINRANGE(42, 60, 3),
+	CYGNUS_PINRANGE(45, 64, 3),
+	CYGNUS_PINRANGE(48, 68, 2),
+	CYGNUS_PINRANGE(50, 84, 6),
+	CYGNUS_PINRANGE(56, 94, 6),
+	CYGNUS_PINRANGE(62, 72, 1),
+	CYGNUS_PINRANGE(63, 70, 1),
+	CYGNUS_PINRANGE(64, 80, 1),
+	CYGNUS_PINRANGE(65, 74, 3),
+	CYGNUS_PINRANGE(68, 78, 1),
+	CYGNUS_PINRANGE(69, 82, 1),
+	CYGNUS_PINRANGE(70, 156, 17),
+	CYGNUS_PINRANGE(87, 104, 12),
+	CYGNUS_PINRANGE(99, 102, 2),
+	CYGNUS_PINRANGE(101, 90, 4),
+	CYGNUS_PINRANGE(105, 116, 10),
+	CYGNUS_PINRANGE(123, 11, 1),
+	CYGNUS_PINRANGE(124, 38, 4),
+	CYGNUS_PINRANGE(128, 43, 1),
+	CYGNUS_PINRANGE(129, 47, 1),
+	CYGNUS_PINRANGE(130, 49, 1),
+	CYGNUS_PINRANGE(131, 53, 1),
+	CYGNUS_PINRANGE(132, 55, 1),
+	CYGNUS_PINRANGE(133, 59, 1),
+	CYGNUS_PINRANGE(134, 63, 1),
+	CYGNUS_PINRANGE(135, 67, 1),
+	CYGNUS_PINRANGE(136, 71, 1),
+	CYGNUS_PINRANGE(137, 73, 1),
+	CYGNUS_PINRANGE(138, 77, 1),
+	CYGNUS_PINRANGE(139, 79, 1),
+	CYGNUS_PINRANGE(140, 81, 1),
+	CYGNUS_PINRANGE(141, 83, 1),
+	CYGNUS_PINRANGE(142, 10, 1)
+};
+
+/*
+ * The Cygnus IOMUX controller mainly supports group based mux configuration,
+ * but certain pins can be muxed to GPIO individually. Only the ASIU GPIO
+ * controller can support this, so it's an optional configuration
+ *
+ * Return -ENODEV means no support and that's fine
+ */
+static int cygnus_gpio_pinmux_add_range(struct cygnus_gpio *chip)
+{
+	struct device_node *node = chip->dev->of_node;
+	struct device_node *pinmux_node;
+	struct platform_device *pinmux_pdev;
+	struct gpio_chip *gc = &chip->gc;
+	int i, ret;
+
+	/* parse DT to find the phandle to the pinmux controller */
+	pinmux_node = of_parse_phandle(node, "pinmux", 0);
+	if (!pinmux_node)
+		return -ENODEV;
+
+	pinmux_pdev = of_find_device_by_node(pinmux_node);
+	if (!pinmux_pdev) {
+		dev_err(chip->dev, "failed to get pinmux device\n");
+		return -EINVAL;
+	}
+
+	/* now need to create the mapping between local GPIO and PINMUX pins */
+	for (i = 0; i < ARRAY_SIZE(cygnus_gpio_pintable); i++) {
+		ret = gpiochip_add_pin_range(gc, dev_name(&pinmux_pdev->dev),
+					     cygnus_gpio_pintable[i].offset,
+					     cygnus_gpio_pintable[i].pin_base,
+					     cygnus_gpio_pintable[i].num_pins);
+		if (ret) {
+			dev_err(chip->dev, "unable to add GPIO pin range\n");
+			goto err_put_device;
+		}
+	}
+
+	chip->pinmux_is_supported = true;
+
+	/* no need for pinmux_pdev device reference anymore */
+	put_device(&pinmux_pdev->dev);
+	return 0;
+
+err_put_device:
+	put_device(&pinmux_pdev->dev);
+	gpiochip_remove_pin_ranges(gc);
+	return ret;
+}
+
+static void cygnus_gpio_pinmux_remove_range(struct cygnus_gpio *chip)
+{
+	struct gpio_chip *gc = &chip->gc;
+
+	if (chip->pinmux_is_supported)
+		gpiochip_remove_pin_ranges(gc);
+}
+
+/*
+ * Cygnus GPIO controller supports some PINCONF related configurations such as
+ * pull up, pull down, and drive strength, when the pin is configured to GPIO
+ *
+ * Here a local pinctrl device is created with simple 1-to-1 pin mapping to the
+ * local GPIO pins
+ */
+static int cygnus_gpio_register_pinconf(struct cygnus_gpio *chip)
+{
+	struct pinctrl_desc *pctldesc = &chip->pctldesc;
+	struct pinctrl_pin_desc *pins;
+	struct gpio_chip *gc = &chip->gc;
+	int i;
+
+	pins = devm_kcalloc(chip->dev, gc->ngpio, sizeof(*pins), GFP_KERNEL);
+	if (!pins)
+		return -ENOMEM;
+
+	for (i = 0; i < gc->ngpio; i++) {
+		pins[i].number = i;
+		pins[i].name = devm_kasprintf(chip->dev, GFP_KERNEL,
+					      "gpio-%d", i);
+		if (!pins[i].name)
+			return -ENOMEM;
+	}
+
+	pctldesc->name = dev_name(chip->dev);
+	pctldesc->pctlops = &cygnus_pctrl_ops;
+	pctldesc->pins = pins;
+	pctldesc->npins = gc->ngpio;
+	pctldesc->confops = &cygnus_pconf_ops;
+
+	chip->pctl = pinctrl_register(pctldesc, chip->dev, chip);
+	if (!chip->pctl) {
+		dev_err(chip->dev, "unable to register pinctrl device\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static void cygnus_gpio_unregister_pinconf(struct cygnus_gpio *chip)
+{
+	if (chip->pctl)
+		pinctrl_unregister(chip->pctl);
+}
+
+static const struct of_device_id cygnus_gpio_of_match[] = {
+	{ .compatible = "brcm,cygnus-gpio" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, cygnus_gpio_of_match);
+
+static int cygnus_gpio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+	struct cygnus_gpio *chip;
+	struct gpio_chip *gc;
+	u32 ngpios;
+	int irq, ret;
+
+	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
+	chip->dev = dev;
+	platform_set_drvdata(pdev, chip);
+
+	if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
+		dev_err(dev, "missing ngpios DT property\n");
+		return -ENODEV;
+	}
+	chip->num_banks = (ngpios + NGPIOS_PER_BANK - 1) / NGPIOS_PER_BANK;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	chip->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(chip->base)) {
+		dev_err(dev, "unable to map I/O memory\n");
+		return PTR_ERR(chip->base);
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (res) {
+		chip->io_ctrl = devm_ioremap_resource(dev, res);
+		if (IS_ERR(chip->io_ctrl)) {
+			dev_err(dev, "unable to map I/O memory\n");
+			return PTR_ERR(chip->io_ctrl);
+		}
+	}
+
+	spin_lock_init(&chip->lock);
+
+	gc = &chip->gc;
+	gc->base = -1;
+	gc->ngpio = ngpios;
+	gc->label = dev_name(dev);
+	gc->dev = dev;
+	gc->of_node = dev->of_node;
+	gc->request = cygnus_gpio_request;
+	gc->free = cygnus_gpio_free;
+	gc->direction_input = cygnus_gpio_direction_input;
+	gc->direction_output = cygnus_gpio_direction_output;
+	gc->set = cygnus_gpio_set;
+	gc->get = cygnus_gpio_get;
+
+	ret = gpiochip_add(gc);
+	if (ret < 0) {
+		dev_err(dev, "unable to add GPIO chip\n");
+		return ret;
+	}
+
+	ret = cygnus_gpio_pinmux_add_range(chip);
+	if (ret && ret != -ENODEV) {
+		dev_err(dev, "unable to add GPIO pin range\n");
+		goto err_rm_gpiochip;
+	}
+
+	ret = cygnus_gpio_register_pinconf(chip);
+	if (ret) {
+		dev_err(dev, "unable to register pinconf\n");
+		goto err_rm_range;
+	}
+
+	/* optional GPIO interrupt support */
+	irq = platform_get_irq(pdev, 0);
+	if (irq) {
+		ret = gpiochip_irqchip_add(gc, &cygnus_gpio_irq_chip, 0,
+					   handle_simple_irq, IRQ_TYPE_NONE);
+		if (ret) {
+			dev_err(dev, "no GPIO irqchip\n");
+			goto err_unregister_pinconf;
+		}
+
+		gpiochip_set_chained_irqchip(gc, &cygnus_gpio_irq_chip, irq,
+					     cygnus_gpio_irq_handler);
+	}
+
+	return 0;
+
+err_unregister_pinconf:
+	cygnus_gpio_unregister_pinconf(chip);
+
+err_rm_range:
+	cygnus_gpio_pinmux_remove_range(chip);
+
+err_rm_gpiochip:
+	gpiochip_remove(gc);
+
+	return ret;
+}
+
+static struct platform_driver cygnus_gpio_driver = {
+	.driver = {
+		.name = "cygnus-gpio",
+		.of_match_table = cygnus_gpio_of_match,
+		.suppress_bind_attrs = true,
+	},
+	.probe = cygnus_gpio_probe,
+};
+
+static int __init cygnus_gpio_init(void)
+{
+	return platform_driver_probe(&cygnus_gpio_driver, cygnus_gpio_probe);
+}
+arch_initcall_sync(cygnus_gpio_init);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus GPIO Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v8 2/4] pinctrl: cygnus: add gpio/pinconf driver

[Ray Jui]

This adds the initial support of the Broadcom Cygnus GPIO/PINCONF driver
that supports all 3 GPIO controllers on Cygnus including the ASIU GPIO
controller, the chipCommonG GPIO controller, and the always-on GPIO
controller. Basic PINCONF configurations such as bias pull up/down, and
drive strength are also supported in this driver.

Pins from the ASIU GPIO controller can be individually muxed to GPIO
function, through interaction with the Cygnus IOMUX controller

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/pinctrl/bcm/Kconfig               |   22 +
 drivers/pinctrl/bcm/Makefile              |    1 +
 drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c |  907 +++++++++++++++++++++++++++++
 3 files changed, 930 insertions(+)
 create mode 100644 drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c

diff --git a/drivers/pinctrl/bcm/Kconfig b/drivers/pinctrl/bcm/Kconfig
index eb13201..cd11d4d 100644
--- a/drivers/pinctrl/bcm/Kconfig
+++ b/drivers/pinctrl/bcm/Kconfig
@@ -20,6 +20,28 @@ config PINCTRL_BCM2835
 	select PINMUX
 	select PINCONF
 
+config PINCTRL_CYGNUS_GPIO
+	bool "Broadcom Cygnus GPIO (with PINCONF) driver"
+	depends on OF_GPIO && ARCH_BCM_CYGNUS
+	select GPIOLIB_IRQCHIP
+	select PINCONF
+	select GENERIC_PINCONF
+	default ARCH_BCM_CYGNUS
+	help
+	  Say yes here to enable the Broadcom Cygnus GPIO driver.
+
+	  The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
+	  GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
+	  the always-ON GPIO controller (CRMU/AON). All 3 GPIO controllers are
+	  supported by this driver.
+
+	  All 3 Cygnus GPIO controllers support basic PINCONF functions such
+	  as bias pull up, pull down, and drive strength configurations, when
+	  these pins are muxed to GPIO.
+
+	  Pins from the ASIU GPIO can be individually muxed to GPIO function,
+	  through interaction with the Cygnus IOMUX controller.
+
 config PINCTRL_CYGNUS_MUX
 	bool "Broadcom Cygnus IOMUX driver"
 	depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
diff --git a/drivers/pinctrl/bcm/Makefile b/drivers/pinctrl/bcm/Makefile
index bb6beb6..2b2f70e 100644
--- a/drivers/pinctrl/bcm/Makefile
+++ b/drivers/pinctrl/bcm/Makefile
@@ -2,4 +2,5 @@
 
 obj-$(CONFIG_PINCTRL_BCM281XX)		+= pinctrl-bcm281xx.o
 obj-$(CONFIG_PINCTRL_BCM2835)		+= pinctrl-bcm2835.o
+obj-$(CONFIG_PINCTRL_CYGNUS_GPIO)	+= pinctrl-cygnus-gpio.o
 obj-$(CONFIG_PINCTRL_CYGNUS_MUX)	+= pinctrl-cygnus-mux.o
diff --git a/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c b/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c
new file mode 100644
index 0000000..1feab0c
--- /dev/null
+++ b/drivers/pinctrl/bcm/pinctrl-cygnus-gpio.c
@@ -0,0 +1,907 @@
+/*
+ * Copyright (C) 2014-2015 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * This file contains the Broadcom Cygnus GPIO driver that supports 3
+ * GPIO controllers on Cygnus including the ASIU GPIO controller, the
+ * chipCommonG GPIO controller, and the always-on GPIO controller. Basic
+ * PINCONF such as bias pull up/down, and drive strength are also supported
+ * in this driver.
+ *
+ * Pins from the ASIU GPIO can be individually muxed to GPIO function,
+ * through the interaction with the Cygnus IOMUX controller
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/ioport.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+
+#include "../pinctrl-utils.h"
+
+#define CYGNUS_GPIO_DATA_IN_OFFSET   0x00
+#define CYGNUS_GPIO_DATA_OUT_OFFSET  0x04
+#define CYGNUS_GPIO_OUT_EN_OFFSET    0x08
+#define CYGNUS_GPIO_IN_TYPE_OFFSET   0x0c
+#define CYGNUS_GPIO_INT_DE_OFFSET    0x10
+#define CYGNUS_GPIO_INT_EDGE_OFFSET  0x14
+#define CYGNUS_GPIO_INT_MSK_OFFSET   0x18
+#define CYGNUS_GPIO_INT_STAT_OFFSET  0x1c
+#define CYGNUS_GPIO_INT_MSTAT_OFFSET 0x20
+#define CYGNUS_GPIO_INT_CLR_OFFSET   0x24
+#define CYGNUS_GPIO_PAD_RES_OFFSET   0x34
+#define CYGNUS_GPIO_RES_EN_OFFSET    0x38
+
+/* drive strength control for ASIU GPIO */
+#define CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58
+
+/* drive strength control for CCM/CRMU (AON) GPIO */
+#define CYGNUS_GPIO_DRV0_CTRL_OFFSET  0x00
+
+#define GPIO_BANK_SIZE 0x200
+#define NGPIOS_PER_BANK 32
+#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)
+
+#define CYGNUS_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + (reg))
+#define CYGNUS_GPIO_SHIFT(pin) ((pin) % NGPIOS_PER_BANK)
+
+#define GPIO_DRV_STRENGTH_BIT_SHIFT  20
+#define GPIO_DRV_STRENGTH_BITS       3
+#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
+
+/*
+ * Cygnus GPIO core
+ *
+ * @dev: pointer to device
+ * @base: I/O register base for Cygnus GPIO controller
+ * @io_ctrl: I/O register base for certain type of Cygnus GPIO controller that
+ * has the PINCONF support implemented outside of the GPIO block
+ * @lock: lock to protect access to I/O registers
+ * @gc: GPIO chip
+ * @num_banks: number of GPIO banks, each bank supports up to 32 GPIOs
+ * @pinmux_is_supported: flag to indicate this GPIO controller contains pins
+ * that can be individually muxed to GPIO
+ * @pctl: pointer to pinctrl_dev
+ * @pctldesc: pinctrl descriptor
+ */
+struct cygnus_gpio {
+	struct device *dev;
+
+	void __iomem *base;
+	void __iomem *io_ctrl;
+
+	spinlock_t lock;
+
+	struct gpio_chip gc;
+	unsigned num_banks;
+
+	bool pinmux_is_supported;
+
+	struct pinctrl_dev *pctl;
+	struct pinctrl_desc pctldesc;
+};
+
+static struct cygnus_gpio *to_cygnus_gpio(struct gpio_chip *gc)
+{
+	return container_of(gc, struct cygnus_gpio, gc);
+}
+
+/*
+ * Mapping from PINCONF pins to GPIO pins is 1-to-1
+ */
+static unsigned cygnus_pin_to_gpio(unsigned pin)
+{
+	return pin;
+}
+
+static u32 cygnus_readl(struct cygnus_gpio *chip, unsigned int offset)
+{
+	return readl(chip->base + offset);
+}
+
+static void cygnus_writel(struct cygnus_gpio *chip, unsigned int offset,
+			  u32 val)
+{
+	writel(val, chip->base + offset);
+}
+
+/**
+ *  cygnus_set_bit - set or clear one bit (corresponding to the GPIO pin) in a
+ *  Cygnus GPIO register
+ *
+ *  @cygnus_gpio: Cygnus GPIO device
+ *  @reg: register offset
+ *  @gpio: GPIO pin
+ *  @set: set or clear. 1 - set; 0 -clear
+ */
+static void cygnus_set_bit(struct cygnus_gpio *chip, unsigned int reg,
+			   unsigned gpio, int set)
+{
+	unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val;
+
+	val = cygnus_readl(chip, offset);
+	if (set)
+		val |= BIT(shift);
+	else
+		val &= ~BIT(shift);
+	cygnus_writel(chip, offset, val);
+}
+
+static int cygnus_get_bit(struct cygnus_gpio *chip, unsigned int reg,
+			  unsigned gpio)
+{
+	unsigned int offset = CYGNUS_GPIO_REG(gpio, reg);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val;
+
+	val = cygnus_readl(chip, offset) & BIT(shift);
+	if (val)
+		return 1;
+	else
+		return 0;
+}
+
+static void cygnus_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+	struct gpio_chip *gc = irq_desc_get_handler_data(desc);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	struct irq_chip *irq_chip = irq_desc_get_chip(desc);
+	int i, bit;
+
+	chained_irq_enter(irq_chip, desc);
+
+	/* go through the entire GPIO banks and handle all interrupts */
+	for (i = 0; i < chip->num_banks; i++) {
+		unsigned long val = cygnus_readl(chip,
+				(i * GPIO_BANK_SIZE) +
+				CYGNUS_GPIO_INT_MSTAT_OFFSET);
+
+		for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {
+			unsigned pin = NGPIOS_PER_BANK * i + bit;
+			int child_irq = irq_find_mapping(gc->irqdomain, pin);
+
+			/*
+			 * Clear the interrupt before invoking the
+			 * handler, so we do not leave any window
+			 */
+			cygnus_writel(chip, (i * GPIO_BANK_SIZE) +
+				      CYGNUS_GPIO_INT_CLR_OFFSET, BIT(bit));
+
+			generic_handle_irq(child_irq);
+		}
+	}
+
+	chained_irq_exit(irq_chip, desc);
+}
+
+
+static void cygnus_gpio_irq_ack(struct irq_data *d)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned gpio = d->hwirq;
+	unsigned int offset = CYGNUS_GPIO_REG(gpio,
+			CYGNUS_GPIO_INT_CLR_OFFSET);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+	u32 val = BIT(shift);
+
+	cygnus_writel(chip, offset, val);
+}
+
+/**
+ *  cygnus_gpio_irq_set_mask - mask/unmask a GPIO interrupt
+ *
+ *  @d: IRQ chip data
+ *  @mask: mask/unmask GPIO interrupt. 0 - mask (disable); 1 - unmask (enable)
+ */
+static void cygnus_gpio_irq_set_mask(struct irq_data *d, int mask)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned gpio = d->hwirq;
+
+	cygnus_set_bit(chip, CYGNUS_GPIO_INT_MSK_OFFSET, gpio, mask);
+}
+
+static void cygnus_gpio_irq_mask(struct irq_data *d)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_gpio_irq_set_mask(d, 0);
+	spin_unlock_irqrestore(&chip->lock, flags);
+}
+
+static void cygnus_gpio_irq_unmask(struct irq_data *d)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_gpio_irq_set_mask(d, 1);
+	spin_unlock_irqrestore(&chip->lock, flags);
+}
+
+static int cygnus_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned gpio = d->hwirq;
+	int int_type = 0, dual_edge = 0, edge_lvl = 0;
+	unsigned long flags;
+
+	switch (type & IRQ_TYPE_SENSE_MASK) {
+	case IRQ_TYPE_EDGE_RISING:
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_EDGE_FALLING:
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		dual_edge = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_HIGH:
+		int_type = 1;
+		edge_lvl = 1;
+		break;
+
+	case IRQ_TYPE_LEVEL_LOW:
+		int_type = 1;
+		break;
+
+	default:
+		dev_err(chip->dev, "invalid GPIO IRQ type 0x%x\n",
+			type);
+		return -EINVAL;
+	}
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_set_bit(chip, CYGNUS_GPIO_IN_TYPE_OFFSET, gpio, int_type);
+	cygnus_set_bit(chip, CYGNUS_GPIO_INT_DE_OFFSET, gpio, dual_edge);
+	cygnus_set_bit(chip, CYGNUS_GPIO_INT_EDGE_OFFSET, gpio,
+		       edge_lvl);
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	dev_dbg(chip->dev,
+		"gpio:%u set int_type:%d dual_edge:%d edge_lvl:%d\n",
+		gpio, int_type, dual_edge, edge_lvl);
+
+	return 0;
+}
+
+static struct irq_chip cygnus_gpio_irq_chip = {
+	.name = "bcm-cygnus-gpio",
+	.irq_ack = cygnus_gpio_irq_ack,
+	.irq_mask = cygnus_gpio_irq_mask,
+	.irq_unmask = cygnus_gpio_irq_unmask,
+	.irq_set_type = cygnus_gpio_irq_set_type,
+};
+
+/*
+ * Request the Cygnus IOMUX pinmux controller to mux individual pins to GPIO
+ */
+static int cygnus_gpio_request(struct gpio_chip *gc, unsigned offset)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned gpio = gc->base + offset;
+
+	/* not all Cygnus GPIO pins can be muxed individually */
+	if (!chip->pinmux_is_supported)
+		return 0;
+
+	return pinctrl_request_gpio(gpio);
+}
+
+static void cygnus_gpio_free(struct gpio_chip *gc, unsigned offset)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned gpio = gc->base + offset;
+
+	if (!chip->pinmux_is_supported)
+		return;
+
+	pinctrl_free_gpio(gpio);
+}
+
+static int cygnus_gpio_direction_input(struct gpio_chip *gc, unsigned gpio)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_set_bit(chip, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 0);
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	dev_dbg(chip->dev, "gpio:%u set input\n", gpio);
+
+	return 0;
+}
+
+static int cygnus_gpio_direction_output(struct gpio_chip *gc, unsigned gpio,
+					int value)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_set_bit(chip, CYGNUS_GPIO_OUT_EN_OFFSET, gpio, 1);
+	cygnus_set_bit(chip, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	dev_dbg(chip->dev, "gpio:%u set output, value:%d\n", gpio, value);
+
+	return 0;
+}
+
+static void cygnus_gpio_set(struct gpio_chip *gc, unsigned gpio, int value)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	cygnus_set_bit(chip, CYGNUS_GPIO_DATA_OUT_OFFSET, gpio, value);
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	dev_dbg(chip->dev, "gpio:%u set, value:%d\n", gpio, value);
+}
+
+static int cygnus_gpio_get(struct gpio_chip *gc, unsigned gpio)
+{
+	struct cygnus_gpio *chip = to_cygnus_gpio(gc);
+	unsigned int offset = CYGNUS_GPIO_REG(gpio,
+					      CYGNUS_GPIO_DATA_IN_OFFSET);
+	unsigned int shift = CYGNUS_GPIO_SHIFT(gpio);
+
+	return !!(cygnus_readl(chip, offset) & BIT(shift));
+}
+
+static int cygnus_get_groups_count(struct pinctrl_dev *pctldev)
+{
+	return 1;
+}
+
+/*
+ * Only one group: "gpio_grp", since this local pinctrl device only performs
+ * GPIO specific PINCONF configurations
+ */
+static const char *cygnus_get_group_name(struct pinctrl_dev *pctldev,
+					 unsigned selector)
+{
+	return "gpio_grp";
+}
+
+static const struct pinctrl_ops cygnus_pctrl_ops = {
+	.get_groups_count = cygnus_get_groups_count,
+	.get_group_name = cygnus_get_group_name,
+	.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
+	.dt_free_map = pinctrl_utils_dt_free_map,
+};
+
+static int cygnus_gpio_set_pull(struct cygnus_gpio *chip, unsigned gpio,
+				int disable, int pull_up)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+
+	if (disable) {
+		cygnus_set_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio, 0);
+	} else {
+		cygnus_set_bit(chip, CYGNUS_GPIO_PAD_RES_OFFSET, gpio,
+			       pull_up);
+		cygnus_set_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio, 1);
+	}
+
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	dev_dbg(chip->dev, "gpio:%u set pullup:%d\n", gpio, pull_up);
+
+	return 0;
+}
+
+static void cygnus_gpio_get_pull(struct cygnus_gpio *chip, unsigned gpio,
+				 int *disable, int *pull_up)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&chip->lock, flags);
+	*disable = !cygnus_get_bit(chip, CYGNUS_GPIO_RES_EN_OFFSET, gpio);
+	*pull_up = cygnus_get_bit(chip, CYGNUS_GPIO_PAD_RES_OFFSET, gpio);
+	spin_unlock_irqrestore(&chip->lock, flags);
+}
+
+static int cygnus_gpio_set_strength(struct cygnus_gpio *chip, unsigned gpio,
+				    unsigned strength)
+{
+	void __iomem *base;
+	unsigned int i, offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	/* make sure drive strength is supported */
+	if (strength < 2 ||  strength > 16 || (strength % 2))
+		return -ENOTSUPP;
+
+	if (chip->io_ctrl) {
+		base = chip->io_ctrl;
+		offset = CYGNUS_GPIO_DRV0_CTRL_OFFSET;
+	} else {
+		base = chip->base;
+		offset = CYGNUS_GPIO_REG(gpio,
+					 CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET);
+	}
+
+	shift = CYGNUS_GPIO_SHIFT(gpio);
+
+	dev_dbg(chip->dev, "gpio:%u set drive strength:%d mA\n", gpio,
+		strength);
+
+	spin_lock_irqsave(&chip->lock, flags);
+	strength = (strength / 2) - 1;
+	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
+		val = readl(base + offset);
+		val &= ~BIT(shift);
+		val |= ((strength >> i) & 0x1) << shift;
+		writel(val, base + offset);
+		offset += 4;
+	}
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	return 0;
+}
+
+static int cygnus_gpio_get_strength(struct cygnus_gpio *chip, unsigned gpio,
+				    u16 *strength)
+{
+	void __iomem *base;
+	unsigned int i, offset, shift;
+	u32 val;
+	unsigned long flags;
+
+	if (chip->io_ctrl) {
+		base = chip->io_ctrl;
+		offset = CYGNUS_GPIO_DRV0_CTRL_OFFSET;
+	} else {
+		base = chip->base;
+		offset = CYGNUS_GPIO_REG(gpio,
+					 CYGNUS_GPIO_ASIU_DRV0_CTRL_OFFSET);
+	}
+
+	shift = CYGNUS_GPIO_SHIFT(gpio);
+
+	spin_lock_irqsave(&chip->lock, flags);
+	*strength = 0;
+	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {
+		val = readl(base + offset) & BIT(shift);
+		val >>= shift;
+		*strength += (val << i);
+		offset += 4;
+	}
+
+	/* convert to mA */
+	*strength = (*strength + 1) * 2;
+	spin_unlock_irqrestore(&chip->lock, flags);
+
+	return 0;
+}
+
+static int cygnus_pin_config_get(struct pinctrl_dev *pctldev, unsigned pin,
+				 unsigned long *config)
+{
+	struct cygnus_gpio *chip = pinctrl_dev_get_drvdata(pctldev);
+	enum pin_config_param param = pinconf_to_config_param(*config);
+	unsigned gpio = cygnus_pin_to_gpio(pin);
+	u16 arg;
+	int disable, pull_up, ret;
+
+	switch (param) {
+	case PIN_CONFIG_BIAS_DISABLE:
+		cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
+		if (disable)
+			return 0;
+		else
+			return -EINVAL;
+
+	case PIN_CONFIG_BIAS_PULL_UP:
+		cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
+		if (!disable && pull_up)
+			return 0;
+		else
+			return -EINVAL;
+
+	case PIN_CONFIG_BIAS_PULL_DOWN:
+		cygnus_gpio_get_pull(chip, gpio, &disable, &pull_up);
+		if (!disable && !pull_up)
+			return 0;
+		else
+			return -EINVAL;
+
+	case PIN_CONFIG_DRIVE_STRENGTH:
+		ret = cygnus_gpio_get_strength(chip, gpio, &arg);
+		if (ret)
+			return ret;
+		else
+			*config = pinconf_to_config_packed(param, arg);
+
+		return 0;
+
+	default:
+		return -ENOTSUPP;
+	}
+
+	return -ENOTSUPP;
+}
+
+static int cygnus_pin_config_set(struct pinctrl_dev *pctldev, unsigned pin,
+				 unsigned long *configs, unsigned num_configs)
+{
+	struct cygnus_gpio *chip = pinctrl_dev_get_drvdata(pctldev);
+	enum pin_config_param param;
+	u16 arg;
+	unsigned i, gpio = cygnus_pin_to_gpio(pin);
+	int ret = -ENOTSUPP;
+
+	for (i = 0; i < num_configs; i++) {
+		param = pinconf_to_config_param(configs[i]);
+		arg = pinconf_to_config_argument(configs[i]);
+
+		switch (param) {
+		case PIN_CONFIG_BIAS_DISABLE:
+			ret = cygnus_gpio_set_pull(chip, gpio, 1, 0);
+			if (ret < 0)
+				goto out;
+			break;
+
+		case PIN_CONFIG_BIAS_PULL_UP:
+			ret = cygnus_gpio_set_pull(chip, gpio, 0, 1);
+			if (ret < 0)
+				goto out;
+			break;
+
+		case PIN_CONFIG_BIAS_PULL_DOWN:
+			ret = cygnus_gpio_set_pull(chip, gpio, 0, 0);
+			if (ret < 0)
+				goto out;
+			break;
+
+		case PIN_CONFIG_DRIVE_STRENGTH:
+			ret = cygnus_gpio_set_strength(chip, gpio, arg);
+			if (ret < 0)
+				goto out;
+			break;
+
+		default:
+			dev_err(chip->dev, "invalid configuration\n");
+			return -ENOTSUPP;
+		}
+	} /* for each config */
+
+out:
+	return ret;
+}
+
+static const struct pinconf_ops cygnus_pconf_ops = {
+	.is_generic = true,
+	.pin_config_get = cygnus_pin_config_get,
+	.pin_config_set = cygnus_pin_config_set,
+};
+
+/*
+ * Map a GPIO in the local gpio_chip pin space to a pin in the Cygnus IOMUX
+ * pinctrl pin space
+ */
+struct cygnus_gpio_pin_range {
+	unsigned offset;
+	unsigned pin_base;
+	unsigned num_pins;
+};
+
+#define CYGNUS_PINRANGE(o, p, n) { .offset = o, .pin_base = p, .num_pins = n }
+
+/*
+ * Pin mapping table for mapping local GPIO pins to Cygnus IOMUX pinctrl pins
+ */
+static const struct cygnus_gpio_pin_range cygnus_gpio_pintable[] = {
+	CYGNUS_PINRANGE(0, 42, 1),
+	CYGNUS_PINRANGE(1, 44, 3),
+	CYGNUS_PINRANGE(4, 48, 1),
+	CYGNUS_PINRANGE(5, 50, 3),
+	CYGNUS_PINRANGE(8, 126, 1),
+	CYGNUS_PINRANGE(9, 155, 1),
+	CYGNUS_PINRANGE(10, 152, 1),
+	CYGNUS_PINRANGE(11, 154, 1),
+	CYGNUS_PINRANGE(12, 153, 1),
+	CYGNUS_PINRANGE(13, 127, 3),
+	CYGNUS_PINRANGE(16, 140, 1),
+	CYGNUS_PINRANGE(17, 145, 7),
+	CYGNUS_PINRANGE(24, 130, 10),
+	CYGNUS_PINRANGE(34, 141, 4),
+	CYGNUS_PINRANGE(38, 54, 1),
+	CYGNUS_PINRANGE(39, 56, 3),
+	CYGNUS_PINRANGE(42, 60, 3),
+	CYGNUS_PINRANGE(45, 64, 3),
+	CYGNUS_PINRANGE(48, 68, 2),
+	CYGNUS_PINRANGE(50, 84, 6),
+	CYGNUS_PINRANGE(56, 94, 6),
+	CYGNUS_PINRANGE(62, 72, 1),
+	CYGNUS_PINRANGE(63, 70, 1),
+	CYGNUS_PINRANGE(64, 80, 1),
+	CYGNUS_PINRANGE(65, 74, 3),
+	CYGNUS_PINRANGE(68, 78, 1),
+	CYGNUS_PINRANGE(69, 82, 1),
+	CYGNUS_PINRANGE(70, 156, 17),
+	CYGNUS_PINRANGE(87, 104, 12),
+	CYGNUS_PINRANGE(99, 102, 2),
+	CYGNUS_PINRANGE(101, 90, 4),
+	CYGNUS_PINRANGE(105, 116, 10),
+	CYGNUS_PINRANGE(123, 11, 1),
+	CYGNUS_PINRANGE(124, 38, 4),
+	CYGNUS_PINRANGE(128, 43, 1),
+	CYGNUS_PINRANGE(129, 47, 1),
+	CYGNUS_PINRANGE(130, 49, 1),
+	CYGNUS_PINRANGE(131, 53, 1),
+	CYGNUS_PINRANGE(132, 55, 1),
+	CYGNUS_PINRANGE(133, 59, 1),
+	CYGNUS_PINRANGE(134, 63, 1),
+	CYGNUS_PINRANGE(135, 67, 1),
+	CYGNUS_PINRANGE(136, 71, 1),
+	CYGNUS_PINRANGE(137, 73, 1),
+	CYGNUS_PINRANGE(138, 77, 1),
+	CYGNUS_PINRANGE(139, 79, 1),
+	CYGNUS_PINRANGE(140, 81, 1),
+	CYGNUS_PINRANGE(141, 83, 1),
+	CYGNUS_PINRANGE(142, 10, 1)
+};
+
+/*
+ * The Cygnus IOMUX controller mainly supports group based mux configuration,
+ * but certain pins can be muxed to GPIO individually. Only the ASIU GPIO
+ * controller can support this, so it's an optional configuration
+ *
+ * Return -ENODEV means no support and that's fine
+ */
+static int cygnus_gpio_pinmux_add_range(struct cygnus_gpio *chip)
+{
+	struct device_node *node = chip->dev->of_node;
+	struct device_node *pinmux_node;
+	struct platform_device *pinmux_pdev;
+	struct gpio_chip *gc = &chip->gc;
+	int i, ret;
+
+	/* parse DT to find the phandle to the pinmux controller */
+	pinmux_node = of_parse_phandle(node, "pinmux", 0);
+	if (!pinmux_node)
+		return -ENODEV;
+
+	pinmux_pdev = of_find_device_by_node(pinmux_node);
+	if (!pinmux_pdev) {
+		dev_err(chip->dev, "failed to get pinmux device\n");
+		return -EINVAL;
+	}
+
+	/* now need to create the mapping between local GPIO and PINMUX pins */
+	for (i = 0; i < ARRAY_SIZE(cygnus_gpio_pintable); i++) {
+		ret = gpiochip_add_pin_range(gc, dev_name(&pinmux_pdev->dev),
+					     cygnus_gpio_pintable[i].offset,
+					     cygnus_gpio_pintable[i].pin_base,
+					     cygnus_gpio_pintable[i].num_pins);
+		if (ret) {
+			dev_err(chip->dev, "unable to add GPIO pin range\n");
+			goto err_put_device;
+		}
+	}
+
+	chip->pinmux_is_supported = true;
+
+	/* no need for pinmux_pdev device reference anymore */
+	put_device(&pinmux_pdev->dev);
+	return 0;
+
+err_put_device:
+	put_device(&pinmux_pdev->dev);
+	gpiochip_remove_pin_ranges(gc);
+	return ret;
+}
+
+static void cygnus_gpio_pinmux_remove_range(struct cygnus_gpio *chip)
+{
+	struct gpio_chip *gc = &chip->gc;
+
+	if (chip->pinmux_is_supported)
+		gpiochip_remove_pin_ranges(gc);
+}
+
+/*
+ * Cygnus GPIO controller supports some PINCONF related configurations such as
+ * pull up, pull down, and drive strength, when the pin is configured to GPIO
+ *
+ * Here a local pinctrl device is created with simple 1-to-1 pin mapping to the
+ * local GPIO pins
+ */
+static int cygnus_gpio_register_pinconf(struct cygnus_gpio *chip)
+{
+	struct pinctrl_desc *pctldesc = &chip->pctldesc;
+	struct pinctrl_pin_desc *pins;
+	struct gpio_chip *gc = &chip->gc;
+	int i;
+
+	pins = devm_kcalloc(chip->dev, gc->ngpio, sizeof(*pins), GFP_KERNEL);
+	if (!pins)
+		return -ENOMEM;
+
+	for (i = 0; i < gc->ngpio; i++) {
+		pins[i].number = i;
+		pins[i].name = devm_kasprintf(chip->dev, GFP_KERNEL,
+					      "gpio-%d", i);
+		if (!pins[i].name)
+			return -ENOMEM;
+	}
+
+	pctldesc->name = dev_name(chip->dev);
+	pctldesc->pctlops = &cygnus_pctrl_ops;
+	pctldesc->pins = pins;
+	pctldesc->npins = gc->ngpio;
+	pctldesc->confops = &cygnus_pconf_ops;
+
+	chip->pctl = pinctrl_register(pctldesc, chip->dev, chip);
+	if (!chip->pctl) {
+		dev_err(chip->dev, "unable to register pinctrl device\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static void cygnus_gpio_unregister_pinconf(struct cygnus_gpio *chip)
+{
+	if (chip->pctl)
+		pinctrl_unregister(chip->pctl);
+}
+
+static const struct of_device_id cygnus_gpio_of_match[] = {
+	{ .compatible = "brcm,cygnus-gpio" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, cygnus_gpio_of_match);
+
+static int cygnus_gpio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+	struct cygnus_gpio *chip;
+	struct gpio_chip *gc;
+	u32 ngpios;
+	int irq, ret;
+
+	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
+	chip->dev = dev;
+	platform_set_drvdata(pdev, chip);
+
+	if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {
+		dev_err(dev, "missing ngpios DT property\n");
+		return -ENODEV;
+	}
+	chip->num_banks = (ngpios + NGPIOS_PER_BANK - 1) / NGPIOS_PER_BANK;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	chip->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(chip->base)) {
+		dev_err(dev, "unable to map I/O memory\n");
+		return PTR_ERR(chip->base);
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (res) {
+		chip->io_ctrl = devm_ioremap_resource(dev, res);
+		if (IS_ERR(chip->io_ctrl)) {
+			dev_err(dev, "unable to map I/O memory\n");
+			return PTR_ERR(chip->io_ctrl);
+		}
+	}
+
+	spin_lock_init(&chip->lock);
+
+	gc = &chip->gc;
+	gc->base = -1;
+	gc->ngpio = ngpios;
+	gc->label = dev_name(dev);
+	gc->dev = dev;
+	gc->of_node = dev->of_node;
+	gc->request = cygnus_gpio_request;
+	gc->free = cygnus_gpio_free;
+	gc->direction_input = cygnus_gpio_direction_input;
+	gc->direction_output = cygnus_gpio_direction_output;
+	gc->set = cygnus_gpio_set;
+	gc->get = cygnus_gpio_get;
+
+	ret = gpiochip_add(gc);
+	if (ret < 0) {
+		dev_err(dev, "unable to add GPIO chip\n");
+		return ret;
+	}
+
+	ret = cygnus_gpio_pinmux_add_range(chip);
+	if (ret && ret != -ENODEV) {
+		dev_err(dev, "unable to add GPIO pin range\n");
+		goto err_rm_gpiochip;
+	}
+
+	ret = cygnus_gpio_register_pinconf(chip);
+	if (ret) {
+		dev_err(dev, "unable to register pinconf\n");
+		goto err_rm_range;
+	}
+
+	/* optional GPIO interrupt support */
+	irq = platform_get_irq(pdev, 0);
+	if (irq) {
+		ret = gpiochip_irqchip_add(gc, &cygnus_gpio_irq_chip, 0,
+					   handle_simple_irq, IRQ_TYPE_NONE);
+		if (ret) {
+			dev_err(dev, "no GPIO irqchip\n");
+			goto err_unregister_pinconf;
+		}
+
+		gpiochip_set_chained_irqchip(gc, &cygnus_gpio_irq_chip, irq,
+					     cygnus_gpio_irq_handler);
+	}
+
+	return 0;
+
+err_unregister_pinconf:
+	cygnus_gpio_unregister_pinconf(chip);
+
+err_rm_range:
+	cygnus_gpio_pinmux_remove_range(chip);
+
+err_rm_gpiochip:
+	gpiochip_remove(gc);
+
+	return ret;
+}
+
+static struct platform_driver cygnus_gpio_driver = {
+	.driver = {
+		.name = "cygnus-gpio",
+		.of_match_table = cygnus_gpio_of_match,
+		.suppress_bind_attrs = true,
+	},
+	.probe = cygnus_gpio_probe,
+};
+
+static int __init cygnus_gpio_init(void)
+{
+	return platform_driver_probe(&cygnus_gpio_driver, cygnus_gpio_probe);
+}
+arch_initcall_sync(cygnus_gpio_init);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Cygnus GPIO Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v8 3/4] ARM: dts: enable GPIO for Broadcom Cygnus

[Ray Jui]

This enables all 3 GPIO controllers including the ASIU GPIO, the
chipcommonG GPIO, and the ALWAYS-ON GPIO, for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index b014ce5..a3b8621 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -60,6 +60,39 @@
 		      <0x0301d24c 0x2c>;
 	};
 
+	gpio_crmu: gpio@03024800 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x03024800 0x50>,
+		      <0x03024008 0x18>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+	};
+
+	gpio_ccm: gpio@1800a000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x1800a000 0x50>,
+		      <0x0301d164 0x20>;
+		ngpios = <24>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+	};
+
+	gpio_asiu: gpio@180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <146>;
+		#gpio-cells = <2>;
+		gpio-controller;
+
+		pinmux = <&pinctrl>;
+
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

[PATCH v8 3/4] ARM: dts: enable GPIO for Broadcom Cygnus

[Ray Jui]

This enables all 3 GPIO controllers including the ASIU GPIO, the
chipcommonG GPIO, and the ALWAYS-ON GPIO, for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index b014ce5..a3b8621 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -60,6 +60,39 @@
 		      <0x0301d24c 0x2c>;
 	};
 
+	gpio_crmu: gpio@03024800 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x03024800 0x50>,
+		      <0x03024008 0x18>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+	};
+
+	gpio_ccm: gpio@1800a000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x1800a000 0x50>,
+		      <0x0301d164 0x20>;
+		ngpios = <24>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+	};
+
+	gpio_asiu: gpio@180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <146>;
+		#gpio-cells = <2>;
+		gpio-controller;
+
+		pinmux = <&pinctrl>;
+
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

[PATCH v8 3/4] ARM: dts: enable GPIO for Broadcom Cygnus

[Ray Jui]

This enables all 3 GPIO controllers including the ASIU GPIO, the
chipcommonG GPIO, and the ALWAYS-ON GPIO, for Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index b014ce5..a3b8621 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -60,6 +60,39 @@
 		      <0x0301d24c 0x2c>;
 	};
 
+	gpio_crmu: gpio at 03024800 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x03024800 0x50>,
+		      <0x03024008 0x18>;
+		ngpios = <6>;
+		#gpio-cells = <2>;
+		gpio-controller;
+	};
+
+	gpio_ccm: gpio at 1800a000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x1800a000 0x50>,
+		      <0x0301d164 0x20>;
+		ngpios = <24>;
+		#gpio-cells = <2>;
+		gpio-controller;
+		interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-controller;
+	};
+
+	gpio_asiu: gpio at 180a5000 {
+		compatible = "brcm,cygnus-gpio";
+		reg = <0x180a5000 0x668>;
+		ngpios = <146>;
+		#gpio-cells = <2>;
+		gpio-controller;
+
+		pinmux = <&pinctrl>;
+
+		interrupt-controller;
+		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
1.7.9.5

[PATCH v8 4/4] ARM: dts: cygnus: enable GPIO based hook detection

[Ray Jui]

This enables GPIO based phone hook detection for Broadcom BCM911360
phone factor board (bcm911360_entphn)

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 arch/arm/boot/dts/bcm911360_entphn.dts |   13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/arm/boot/dts/bcm911360_entphn.dts b/arch/arm/boot/dts/bcm911360_entphn.dts
index d2ee952..7db4843 100644
--- a/arch/arm/boot/dts/bcm911360_entphn.dts
+++ b/arch/arm/boot/dts/bcm911360_entphn.dts
@@ -33,6 +33,7 @@
 /dts-v1/;
 
 #include "bcm-cygnus.dtsi"
+#include "dt-bindings/input/input.h"
 
 / {
 	model = "Cygnus Enterprise Phone (BCM911360_ENTPHN)";
@@ -50,4 +51,16 @@
 	uart3: serial@18023000 {
 		status = "okay";
 	};
+
+	gpio_keys {
+		compatible = "gpio-keys";
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		hook {
+			label = "HOOK";
+			linux,code = <KEY_O>;
+			gpios = <&gpio_asiu 48 0>;
+		};
+	};
 };
-- 
1.7.9.5

[PATCH v8 4/4] ARM: dts: cygnus: enable GPIO based hook detection

[Ray Jui]

This enables GPIO based phone hook detection for Broadcom BCM911360
phone factor board (bcm911360_entphn)

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 arch/arm/boot/dts/bcm911360_entphn.dts |   13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/arm/boot/dts/bcm911360_entphn.dts b/arch/arm/boot/dts/bcm911360_entphn.dts
index d2ee952..7db4843 100644
--- a/arch/arm/boot/dts/bcm911360_entphn.dts
+++ b/arch/arm/boot/dts/bcm911360_entphn.dts
@@ -33,6 +33,7 @@
 /dts-v1/;
 
 #include "bcm-cygnus.dtsi"
+#include "dt-bindings/input/input.h"
 
 / {
 	model = "Cygnus Enterprise Phone (BCM911360_ENTPHN)";
@@ -50,4 +51,16 @@
 	uart3: serial@18023000 {
 		status = "okay";
 	};
+
+	gpio_keys {
+		compatible = "gpio-keys";
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		hook {
+			label = "HOOK";
+			linux,code = <KEY_O>;
+			gpios = <&gpio_asiu 48 0>;
+		};
+	};
 };
-- 
1.7.9.5

[PATCH v8 4/4] ARM: dts: cygnus: enable GPIO based hook detection

[Ray Jui]

This enables GPIO based phone hook detection for Broadcom BCM911360
phone factor board (bcm911360_entphn)

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 arch/arm/boot/dts/bcm911360_entphn.dts |   13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/arm/boot/dts/bcm911360_entphn.dts b/arch/arm/boot/dts/bcm911360_entphn.dts
index d2ee952..7db4843 100644
--- a/arch/arm/boot/dts/bcm911360_entphn.dts
+++ b/arch/arm/boot/dts/bcm911360_entphn.dts
@@ -33,6 +33,7 @@
 /dts-v1/;
 
 #include "bcm-cygnus.dtsi"
+#include "dt-bindings/input/input.h"
 
 / {
 	model = "Cygnus Enterprise Phone (BCM911360_ENTPHN)";
@@ -50,4 +51,16 @@
 	uart3: serial at 18023000 {
 		status = "okay";
 	};
+
+	gpio_keys {
+		compatible = "gpio-keys";
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		hook {
+			label = "HOOK";
+			linux,code = <KEY_O>;
+			gpios = <&gpio_asiu 48 0>;
+		};
+	};
 };
-- 
1.7.9.5

Re: [PATCH v4 2/5] clk: iproc: add initial common clock support

[Stephen Boyd]

On 02/03/15 10:33, Ray Jui wrote:
> +/*
> + * Get the clock rate based on name
> + */
> +static unsigned long __get_rate(const char *clk_name)
> +{
> +	struct clk *clk;
> +
> +	clk = __clk_lookup(clk_name);
> +	if (!clk) {
> +		pr_err("%s: unable to find clock by name: %s\n", __func__,
> +				clk_name);
> +		return 0;
> +	}
> +
> +	return clk_get_rate(clk);
> +}
> +

This looks like something we should be providing in the core framework.
Care to make it into an of_clk_get_parent_rate() API?

> +extern void __init iproc_armpll_setup(struct device_node *node);
> +extern void __init iproc_pll_setup(struct device_node *node,
> +		const struct iproc_pll_ctrl *ctrl,
> +		const struct iproc_pll_vco_freq_param *vco_param,
> +		unsigned int num_freqs);
> +extern void __init iproc_clk_setup(struct device_node *node,
> +		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks);
> +extern void __init iproc_asiu_setup(struct device_node *node,
> +		const struct iproc_asiu_div *div,
> +		const struct iproc_asiu_gate *gate, unsigned int num_clks);

__init is not necessary in header files.

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

[PATCH v4 2/5] clk: iproc: add initial common clock support

[Stephen Boyd]

On 02/03/15 10:33, Ray Jui wrote:
> +/*
> + * Get the clock rate based on name
> + */
> +static unsigned long __get_rate(const char *clk_name)
> +{
> +	struct clk *clk;
> +
> +	clk = __clk_lookup(clk_name);
> +	if (!clk) {
> +		pr_err("%s: unable to find clock by name: %s\n", __func__,
> +				clk_name);
> +		return 0;
> +	}
> +
> +	return clk_get_rate(clk);
> +}
> +

This looks like something we should be providing in the core framework.
Care to make it into an of_clk_get_parent_rate() API?

> +extern void __init iproc_armpll_setup(struct device_node *node);
> +extern void __init iproc_pll_setup(struct device_node *node,
> +		const struct iproc_pll_ctrl *ctrl,
> +		const struct iproc_pll_vco_freq_param *vco_param,
> +		unsigned int num_freqs);
> +extern void __init iproc_clk_setup(struct device_node *node,
> +		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks);
> +extern void __init iproc_asiu_setup(struct device_node *node,
> +		const struct iproc_asiu_div *div,
> +		const struct iproc_asiu_gate *gate, unsigned int num_clks);

__init is not necessary in header files.

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

Re: [PATCH v4 2/5] clk: iproc: add initial common clock support

[Ray Jui]

On 2/4/2015 3:13 PM, Stephen Boyd wrote:
> On 02/03/15 10:33, Ray Jui wrote:
>> +/*
>> + * Get the clock rate based on name
>> + */
>> +static unsigned long __get_rate(const char *clk_name)
>> +{
>> +	struct clk *clk;
>> +
>> +	clk = __clk_lookup(clk_name);
>> +	if (!clk) {
>> +		pr_err("%s: unable to find clock by name: %s\n", __func__,
>> +				clk_name);
>> +		return 0;
>> +	}
>> +
>> +	return clk_get_rate(clk);
>> +}
>> +
> 
> This looks like something we should be providing in the core framework.
> Care to make it into an of_clk_get_parent_rate() API?
> 

I would love to! Note __get_rate here is really getting the clock rate
with a name provided. Can you be more specific on what you want? If I'm
not mistaken, what you really want is this?

unsigned long of_clk_get_parent_rate(struct device_node *np, int index);

>> +extern void __init iproc_armpll_setup(struct device_node *node);
>> +extern void __init iproc_pll_setup(struct device_node *node,
>> +		const struct iproc_pll_ctrl *ctrl,
>> +		const struct iproc_pll_vco_freq_param *vco_param,
>> +		unsigned int num_freqs);
>> +extern void __init iproc_clk_setup(struct device_node *node,
>> +		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks);
>> +extern void __init iproc_asiu_setup(struct device_node *node,
>> +		const struct iproc_asiu_div *div,
>> +		const struct iproc_asiu_gate *gate, unsigned int num_clks);
> 
> __init is not necessary in header files.
> 

Okay I'll remove __init. Thanks.

Ray

Re: [PATCH v4 2/5] clk: iproc: add initial common clock support

[Ray Jui]

On 2/4/2015 3:13 PM, Stephen Boyd wrote:
> On 02/03/15 10:33, Ray Jui wrote:
>> +/*
>> + * Get the clock rate based on name
>> + */
>> +static unsigned long __get_rate(const char *clk_name)
>> +{
>> +	struct clk *clk;
>> +
>> +	clk = __clk_lookup(clk_name);
>> +	if (!clk) {
>> +		pr_err("%s: unable to find clock by name: %s\n", __func__,
>> +				clk_name);
>> +		return 0;
>> +	}
>> +
>> +	return clk_get_rate(clk);
>> +}
>> +
> 
> This looks like something we should be providing in the core framework.
> Care to make it into an of_clk_get_parent_rate() API?
> 

I would love to! Note __get_rate here is really getting the clock rate
with a name provided. Can you be more specific on what you want? If I'm
not mistaken, what you really want is this?

unsigned long of_clk_get_parent_rate(struct device_node *np, int index);

>> +extern void __init iproc_armpll_setup(struct device_node *node);
>> +extern void __init iproc_pll_setup(struct device_node *node,
>> +		const struct iproc_pll_ctrl *ctrl,
>> +		const struct iproc_pll_vco_freq_param *vco_param,
>> +		unsigned int num_freqs);
>> +extern void __init iproc_clk_setup(struct device_node *node,
>> +		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks);
>> +extern void __init iproc_asiu_setup(struct device_node *node,
>> +		const struct iproc_asiu_div *div,
>> +		const struct iproc_asiu_gate *gate, unsigned int num_clks);
> 
> __init is not necessary in header files.
> 

Okay I'll remove __init. Thanks.

Ray
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[PATCH v4 2/5] clk: iproc: add initial common clock support

[Ray Jui]

On 2/4/2015 3:13 PM, Stephen Boyd wrote:
> On 02/03/15 10:33, Ray Jui wrote:
>> +/*
>> + * Get the clock rate based on name
>> + */
>> +static unsigned long __get_rate(const char *clk_name)
>> +{
>> +	struct clk *clk;
>> +
>> +	clk = __clk_lookup(clk_name);
>> +	if (!clk) {
>> +		pr_err("%s: unable to find clock by name: %s\n", __func__,
>> +				clk_name);
>> +		return 0;
>> +	}
>> +
>> +	return clk_get_rate(clk);
>> +}
>> +
> 
> This looks like something we should be providing in the core framework.
> Care to make it into an of_clk_get_parent_rate() API?
> 

I would love to! Note __get_rate here is really getting the clock rate
with a name provided. Can you be more specific on what you want? If I'm
not mistaken, what you really want is this?

unsigned long of_clk_get_parent_rate(struct device_node *np, int index);

>> +extern void __init iproc_armpll_setup(struct device_node *node);
>> +extern void __init iproc_pll_setup(struct device_node *node,
>> +		const struct iproc_pll_ctrl *ctrl,
>> +		const struct iproc_pll_vco_freq_param *vco_param,
>> +		unsigned int num_freqs);
>> +extern void __init iproc_clk_setup(struct device_node *node,
>> +		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks);
>> +extern void __init iproc_asiu_setup(struct device_node *node,
>> +		const struct iproc_asiu_div *div,
>> +		const struct iproc_asiu_gate *gate, unsigned int num_clks);
> 
> __init is not necessary in header files.
> 

Okay I'll remove __init. Thanks.

Ray

Re: [PATCH v4 2/5] clk: iproc: add initial common clock support

[Stephen Boyd]

On 02/04/15 15:33, Ray Jui wrote:
>
> On 2/4/2015 3:13 PM, Stephen Boyd wrote:
>> On 02/03/15 10:33, Ray Jui wrote:
>>> +/*
>>> + * Get the clock rate based on name
>>> + */
>>> +static unsigned long __get_rate(const char *clk_name)
>>> +{
>>> +	struct clk *clk;
>>> +
>>> +	clk = __clk_lookup(clk_name);
>>> +	if (!clk) {
>>> +		pr_err("%s: unable to find clock by name: %s\n", __func__,
>>> +				clk_name);
>>> +		return 0;
>>> +	}
>>> +
>>> +	return clk_get_rate(clk);
>>> +}
>>> +
>> This looks like something we should be providing in the core framework.
>> Care to make it into an of_clk_get_parent_rate() API?
>>
> I would love to! Note __get_rate here is really getting the clock rate
> with a name provided. Can you be more specific on what you want? If I'm
> not mistaken, what you really want is this?
>
> unsigned long of_clk_get_parent_rate(struct device_node *np, int index);

Yes that looks good.

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

Re: [PATCH v4 2/5] clk: iproc: add initial common clock support

[Stephen Boyd]

On 02/04/15 15:33, Ray Jui wrote:
>
> On 2/4/2015 3:13 PM, Stephen Boyd wrote:
>> On 02/03/15 10:33, Ray Jui wrote:
>>> +/*
>>> + * Get the clock rate based on name
>>> + */
>>> +static unsigned long __get_rate(const char *clk_name)
>>> +{
>>> +	struct clk *clk;
>>> +
>>> +	clk = __clk_lookup(clk_name);
>>> +	if (!clk) {
>>> +		pr_err("%s: unable to find clock by name: %s\n", __func__,
>>> +				clk_name);
>>> +		return 0;
>>> +	}
>>> +
>>> +	return clk_get_rate(clk);
>>> +}
>>> +
>> This looks like something we should be providing in the core framework.
>> Care to make it into an of_clk_get_parent_rate() API?
>>
> I would love to! Note __get_rate here is really getting the clock rate
> with a name provided. Can you be more specific on what you want? If I'm
> not mistaken, what you really want is this?
>
> unsigned long of_clk_get_parent_rate(struct device_node *np, int index);

Yes that looks good.

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

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[PATCH v4 2/5] clk: iproc: add initial common clock support

[Stephen Boyd]

On 02/04/15 15:33, Ray Jui wrote:
>
> On 2/4/2015 3:13 PM, Stephen Boyd wrote:
>> On 02/03/15 10:33, Ray Jui wrote:
>>> +/*
>>> + * Get the clock rate based on name
>>> + */
>>> +static unsigned long __get_rate(const char *clk_name)
>>> +{
>>> +	struct clk *clk;
>>> +
>>> +	clk = __clk_lookup(clk_name);
>>> +	if (!clk) {
>>> +		pr_err("%s: unable to find clock by name: %s\n", __func__,
>>> +				clk_name);
>>> +		return 0;
>>> +	}
>>> +
>>> +	return clk_get_rate(clk);
>>> +}
>>> +
>> This looks like something we should be providing in the core framework.
>> Care to make it into an of_clk_get_parent_rate() API?
>>
> I would love to! Note __get_rate here is really getting the clock rate
> with a name provided. Can you be more specific on what you want? If I'm
> not mistaken, what you really want is this?
>
> unsigned long of_clk_get_parent_rate(struct device_node *np, int index);

Yes that looks good.

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

[PATCH v5 0/6] Add common clock support for Broadcom iProc architecture

[Ray Jui]

This patchset contains the initial common clock support for Broadcom's iProc
family of SoCs. The iProc clock architecture comprises of various PLLs, e.g.,
ARMPLL, GENPLL, LCPLL0, MIPIPLL, and etc. An onboard crystal serves as the
basic reference clock for these PLLs. Each PLL may have several leaf clocks.
One special group of clocks is the ASIU clocks, which are dervied directly
from the crystal reference clock.

This patchset also contains the basic clock support for the Broadcom Cygnus
SoC, which implements the iProc clock architecture

Changes from v4:
 - Add of_clk_get_parent_rate helper function into the clock framework
 - Switch to use of_clk_get_parent_rate in the iProc PLL clock driver

Changes from v3:
 - Fix incorrect use of passing in of_clk_src_onecell_get when adding ARM PLL
   and other iProc PLLs as clock provider. These PLLs have zero cells in DT and
   thefore of_clk_src_simple_get should be used instead
 - Rename Cygnus MIPI PLL Channel 2 clock from BCM_CYGNUS_MIPIPLL_CH2_UNUSED
   to BCM_CYGNUS_MIPIPLL_CH2_V3D, since a 3D graphic rendering engine has been
   integrated into Cygnus revision B0 and has its core clock running off
   MIPI PLL Channel 2
 - Changed default MIPI PLL VCO frequency from 1.75 GHz to 2.1 GHz. This allows
   us to derive 300 MHz V3D clock from channel 2 through the post divisor

Changes from v2:
 - Re-arrange Cygnus clock/pll init functions so each init function is right
   next to its clock table
 - Removed #defines for number of clocks in Cygnus. Have the number of clocks
   automatically determined based on array size of the clock table

Changes from v1:
 - Separate drivers/clk/Makefile change for drivers/clk/bcm out to a standalone patch

Ray Jui (6):
  clk: add of_clk_get_parent_rate function
  clk: iproc: define Broadcom iProc clock binding
  clk: iproc: add initial common clock support
  clk: Change bcm clocks build dependency
  clk: cygnus: add clock support for Broadcom Cygnus
  ARM: dts: enable clock support for Broadcom Cygnus

 arch/arm/boot/dts/bcm-cygnus-clock.dtsi |  110 ++++++--
 arch/arm/boot/dts/bcm-cygnus.dtsi       |    2 +-
 brcm,iproc-clocks.txt                   |  178 ++++++++++++
 drivers/clk/Makefile                    |    2 +-
 drivers/clk/bcm/Kconfig                 |    9 +
 drivers/clk/bcm/Makefile                |    2 +
 drivers/clk/bcm/clk-cygnus.c            |  277 +++++++++++++++++++
 drivers/clk/bcm/clk-iproc-armpll.c      |  282 +++++++++++++++++++
 drivers/clk/bcm/clk-iproc-asiu.c        |  275 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-clk.c         |  238 ++++++++++++++++
 drivers/clk/bcm/clk-iproc-pll.c         |  461 +++++++++++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc.h             |  157 +++++++++++
 drivers/clk/clk.c                       |   17 ++
 include/dt-bindings/clock/bcm-cygnus.h  |   65 +++++
 include/linux/clk-provider.h            |    6 +-
 15 files changed, 2053 insertions(+), 28 deletions(-)
 create mode 100644 brcm,iproc-clocks.txt
 create mode 100644 drivers/clk/bcm/clk-cygnus.c
 create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
 create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
 create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
 create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
 create mode 100644 drivers/clk/bcm/clk-iproc.h
 create mode 100644 include/dt-bindings/clock/bcm-cygnus.h

-- 
1.7.9.5

[PATCH v5 0/6] Add common clock support for Broadcom iProc architecture

[Ray Jui]

This patchset contains the initial common clock support for Broadcom's iProc
family of SoCs. The iProc clock architecture comprises of various PLLs, e.g.,
ARMPLL, GENPLL, LCPLL0, MIPIPLL, and etc. An onboard crystal serves as the
basic reference clock for these PLLs. Each PLL may have several leaf clocks.
One special group of clocks is the ASIU clocks, which are dervied directly
from the crystal reference clock.

This patchset also contains the basic clock support for the Broadcom Cygnus
SoC, which implements the iProc clock architecture

Changes from v4:
 - Add of_clk_get_parent_rate helper function into the clock framework
 - Switch to use of_clk_get_parent_rate in the iProc PLL clock driver

Changes from v3:
 - Fix incorrect use of passing in of_clk_src_onecell_get when adding ARM PLL
   and other iProc PLLs as clock provider. These PLLs have zero cells in DT and
   thefore of_clk_src_simple_get should be used instead
 - Rename Cygnus MIPI PLL Channel 2 clock from BCM_CYGNUS_MIPIPLL_CH2_UNUSED
   to BCM_CYGNUS_MIPIPLL_CH2_V3D, since a 3D graphic rendering engine has been
   integrated into Cygnus revision B0 and has its core clock running off
   MIPI PLL Channel 2
 - Changed default MIPI PLL VCO frequency from 1.75 GHz to 2.1 GHz. This allows
   us to derive 300 MHz V3D clock from channel 2 through the post divisor

Changes from v2:
 - Re-arrange Cygnus clock/pll init functions so each init function is right
   next to its clock table
 - Removed #defines for number of clocks in Cygnus. Have the number of clocks
   automatically determined based on array size of the clock table

Changes from v1:
 - Separate drivers/clk/Makefile change for drivers/clk/bcm out to a standalone patch

Ray Jui (6):
  clk: add of_clk_get_parent_rate function
  clk: iproc: define Broadcom iProc clock binding
  clk: iproc: add initial common clock support
  clk: Change bcm clocks build dependency
  clk: cygnus: add clock support for Broadcom Cygnus
  ARM: dts: enable clock support for Broadcom Cygnus

 arch/arm/boot/dts/bcm-cygnus-clock.dtsi |  110 ++++++--
 arch/arm/boot/dts/bcm-cygnus.dtsi       |    2 +-
 brcm,iproc-clocks.txt                   |  178 ++++++++++++
 drivers/clk/Makefile                    |    2 +-
 drivers/clk/bcm/Kconfig                 |    9 +
 drivers/clk/bcm/Makefile                |    2 +
 drivers/clk/bcm/clk-cygnus.c            |  277 +++++++++++++++++++
 drivers/clk/bcm/clk-iproc-armpll.c      |  282 +++++++++++++++++++
 drivers/clk/bcm/clk-iproc-asiu.c        |  275 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-clk.c         |  238 ++++++++++++++++
 drivers/clk/bcm/clk-iproc-pll.c         |  461 +++++++++++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc.h             |  157 +++++++++++
 drivers/clk/clk.c                       |   17 ++
 include/dt-bindings/clock/bcm-cygnus.h  |   65 +++++
 include/linux/clk-provider.h            |    6 +-
 15 files changed, 2053 insertions(+), 28 deletions(-)
 create mode 100644 brcm,iproc-clocks.txt
 create mode 100644 drivers/clk/bcm/clk-cygnus.c
 create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
 create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
 create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
 create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
 create mode 100644 drivers/clk/bcm/clk-iproc.h
 create mode 100644 include/dt-bindings/clock/bcm-cygnus.h

-- 
1.7.9.5

[PATCH v5 0/6] Add common clock support for Broadcom iProc architecture

[Ray Jui]

This patchset contains the initial common clock support for Broadcom's iProc
family of SoCs. The iProc clock architecture comprises of various PLLs, e.g.,
ARMPLL, GENPLL, LCPLL0, MIPIPLL, and etc. An onboard crystal serves as the
basic reference clock for these PLLs. Each PLL may have several leaf clocks.
One special group of clocks is the ASIU clocks, which are dervied directly
from the crystal reference clock.

This patchset also contains the basic clock support for the Broadcom Cygnus
SoC, which implements the iProc clock architecture

Changes from v4:
 - Add of_clk_get_parent_rate helper function into the clock framework
 - Switch to use of_clk_get_parent_rate in the iProc PLL clock driver

Changes from v3:
 - Fix incorrect use of passing in of_clk_src_onecell_get when adding ARM PLL
   and other iProc PLLs as clock provider. These PLLs have zero cells in DT and
   thefore of_clk_src_simple_get should be used instead
 - Rename Cygnus MIPI PLL Channel 2 clock from BCM_CYGNUS_MIPIPLL_CH2_UNUSED
   to BCM_CYGNUS_MIPIPLL_CH2_V3D, since a 3D graphic rendering engine has been
   integrated into Cygnus revision B0 and has its core clock running off
   MIPI PLL Channel 2
 - Changed default MIPI PLL VCO frequency from 1.75 GHz to 2.1 GHz. This allows
   us to derive 300 MHz V3D clock from channel 2 through the post divisor

Changes from v2:
 - Re-arrange Cygnus clock/pll init functions so each init function is right
   next to its clock table
 - Removed #defines for number of clocks in Cygnus. Have the number of clocks
   automatically determined based on array size of the clock table

Changes from v1:
 - Separate drivers/clk/Makefile change for drivers/clk/bcm out to a standalone patch

Ray Jui (6):
  clk: add of_clk_get_parent_rate function
  clk: iproc: define Broadcom iProc clock binding
  clk: iproc: add initial common clock support
  clk: Change bcm clocks build dependency
  clk: cygnus: add clock support for Broadcom Cygnus
  ARM: dts: enable clock support for Broadcom Cygnus

 arch/arm/boot/dts/bcm-cygnus-clock.dtsi |  110 ++++++--
 arch/arm/boot/dts/bcm-cygnus.dtsi       |    2 +-
 brcm,iproc-clocks.txt                   |  178 ++++++++++++
 drivers/clk/Makefile                    |    2 +-
 drivers/clk/bcm/Kconfig                 |    9 +
 drivers/clk/bcm/Makefile                |    2 +
 drivers/clk/bcm/clk-cygnus.c            |  277 +++++++++++++++++++
 drivers/clk/bcm/clk-iproc-armpll.c      |  282 +++++++++++++++++++
 drivers/clk/bcm/clk-iproc-asiu.c        |  275 ++++++++++++++++++
 drivers/clk/bcm/clk-iproc-clk.c         |  238 ++++++++++++++++
 drivers/clk/bcm/clk-iproc-pll.c         |  461 +++++++++++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc.h             |  157 +++++++++++
 drivers/clk/clk.c                       |   17 ++
 include/dt-bindings/clock/bcm-cygnus.h  |   65 +++++
 include/linux/clk-provider.h            |    6 +-
 15 files changed, 2053 insertions(+), 28 deletions(-)
 create mode 100644 brcm,iproc-clocks.txt
 create mode 100644 drivers/clk/bcm/clk-cygnus.c
 create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
 create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
 create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
 create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
 create mode 100644 drivers/clk/bcm/clk-iproc.h
 create mode 100644 include/dt-bindings/clock/bcm-cygnus.h

-- 
1.7.9.5

[PATCH v5 1/6] clk: add of_clk_get_parent_rate function

[Ray Jui]

Sometimes a clock needs to know the rate of its parent before itself is
registered to the framework. An example is that a PLL may need to
initialize itself to a specific VCO frequency, before registering to the
framework. The parent rate needs to be known, for PLL multipliers and
divisors to be configured properly.

Introduce helper function of_clk_get_parent_rate, which can be used to
obtain the parent rate of a clock, given a device node and index.

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 drivers/clk/clk.c            |   17 +++++++++++++++++
 include/linux/clk-provider.h |    6 +++++-
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index d48ac71..e1893a2 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -2581,6 +2581,23 @@ const char *of_clk_get_parent_name(struct device_node *np, int index)
 }
 EXPORT_SYMBOL_GPL(of_clk_get_parent_name);
 
+unsigned long of_clk_get_parent_rate(struct device_node *np, int index)
+{
+	const char *parent_name;
+	struct clk *parent_clk;
+
+	parent_name = of_clk_get_parent_name(np, index);
+	if (!parent_name)
+		return 0;
+
+	parent_clk = __clk_lookup(parent_name);
+	if (!parent_clk)
+		return 0;
+
+	return clk_get_rate(parent_clk);
+}
+EXPORT_SYMBOL_GPL(of_clk_get_parent_rate);
+
 struct clock_provider {
 	of_clk_init_cb_t clk_init_cb;
 	struct device_node *np;
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index d936409..e1e2d95 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -585,7 +585,7 @@ struct clk *of_clk_src_simple_get(struct of_phandle_args *clkspec,
 struct clk *of_clk_src_onecell_get(struct of_phandle_args *clkspec, void *data);
 int of_clk_get_parent_count(struct device_node *np);
 const char *of_clk_get_parent_name(struct device_node *np, int index);
-
+unsigned long of_clk_get_parent_rate(struct device_node *np, int index);
 void of_clk_init(const struct of_device_id *matches);
 
 #else /* !CONFIG_OF */
@@ -614,6 +614,10 @@ static inline const char *of_clk_get_parent_name(struct device_node *np,
 {
 	return NULL;
 }
+static unsigned long of_clk_get_parent_rate(struct device_node *np, int index)
+{
+	return 0;
+}
 #define of_clk_init(matches) \
 	{ while (0); }
 #endif /* CONFIG_OF */
-- 
1.7.9.5

[PATCH v5 1/6] clk: add of_clk_get_parent_rate function

[Ray Jui]

Sometimes a clock needs to know the rate of its parent before itself is
registered to the framework. An example is that a PLL may need to
initialize itself to a specific VCO frequency, before registering to the
framework. The parent rate needs to be known, for PLL multipliers and
divisors to be configured properly.

Introduce helper function of_clk_get_parent_rate, which can be used to
obtain the parent rate of a clock, given a device node and index.

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 drivers/clk/clk.c            |   17 +++++++++++++++++
 include/linux/clk-provider.h |    6 +++++-
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index d48ac71..e1893a2 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -2581,6 +2581,23 @@ const char *of_clk_get_parent_name(struct device_node *np, int index)
 }
 EXPORT_SYMBOL_GPL(of_clk_get_parent_name);
 
+unsigned long of_clk_get_parent_rate(struct device_node *np, int index)
+{
+	const char *parent_name;
+	struct clk *parent_clk;
+
+	parent_name = of_clk_get_parent_name(np, index);
+	if (!parent_name)
+		return 0;
+
+	parent_clk = __clk_lookup(parent_name);
+	if (!parent_clk)
+		return 0;
+
+	return clk_get_rate(parent_clk);
+}
+EXPORT_SYMBOL_GPL(of_clk_get_parent_rate);
+
 struct clock_provider {
 	of_clk_init_cb_t clk_init_cb;
 	struct device_node *np;
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index d936409..e1e2d95 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -585,7 +585,7 @@ struct clk *of_clk_src_simple_get(struct of_phandle_args *clkspec,
 struct clk *of_clk_src_onecell_get(struct of_phandle_args *clkspec, void *data);
 int of_clk_get_parent_count(struct device_node *np);
 const char *of_clk_get_parent_name(struct device_node *np, int index);
-
+unsigned long of_clk_get_parent_rate(struct device_node *np, int index);
 void of_clk_init(const struct of_device_id *matches);
 
 #else /* !CONFIG_OF */
@@ -614,6 +614,10 @@ static inline const char *of_clk_get_parent_name(struct device_node *np,
 {
 	return NULL;
 }
+static unsigned long of_clk_get_parent_rate(struct device_node *np, int index)
+{
+	return 0;
+}
 #define of_clk_init(matches) \
 	{ while (0); }
 #endif /* CONFIG_OF */
-- 
1.7.9.5

[PATCH v5 1/6] clk: add of_clk_get_parent_rate function

[Ray Jui]

Sometimes a clock needs to know the rate of its parent before itself is
registered to the framework. An example is that a PLL may need to
initialize itself to a specific VCO frequency, before registering to the
framework. The parent rate needs to be known, for PLL multipliers and
divisors to be configured properly.

Introduce helper function of_clk_get_parent_rate, which can be used to
obtain the parent rate of a clock, given a device node and index.

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 drivers/clk/clk.c            |   17 +++++++++++++++++
 include/linux/clk-provider.h |    6 +++++-
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index d48ac71..e1893a2 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -2581,6 +2581,23 @@ const char *of_clk_get_parent_name(struct device_node *np, int index)
 }
 EXPORT_SYMBOL_GPL(of_clk_get_parent_name);
 
+unsigned long of_clk_get_parent_rate(struct device_node *np, int index)
+{
+	const char *parent_name;
+	struct clk *parent_clk;
+
+	parent_name = of_clk_get_parent_name(np, index);
+	if (!parent_name)
+		return 0;
+
+	parent_clk = __clk_lookup(parent_name);
+	if (!parent_clk)
+		return 0;
+
+	return clk_get_rate(parent_clk);
+}
+EXPORT_SYMBOL_GPL(of_clk_get_parent_rate);
+
 struct clock_provider {
 	of_clk_init_cb_t clk_init_cb;
 	struct device_node *np;
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index d936409..e1e2d95 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -585,7 +585,7 @@ struct clk *of_clk_src_simple_get(struct of_phandle_args *clkspec,
 struct clk *of_clk_src_onecell_get(struct of_phandle_args *clkspec, void *data);
 int of_clk_get_parent_count(struct device_node *np);
 const char *of_clk_get_parent_name(struct device_node *np, int index);
-
+unsigned long of_clk_get_parent_rate(struct device_node *np, int index);
 void of_clk_init(const struct of_device_id *matches);
 
 #else /* !CONFIG_OF */
@@ -614,6 +614,10 @@ static inline const char *of_clk_get_parent_name(struct device_node *np,
 {
 	return NULL;
 }
+static unsigned long of_clk_get_parent_rate(struct device_node *np, int index)
+{
+	return 0;
+}
 #define of_clk_init(matches) \
 	{ while (0); }
 #endif /* CONFIG_OF */
-- 
1.7.9.5

[PATCH v5 2/6] clk: iproc: define Broadcom iProc clock binding

[Ray Jui]

Document the device tree binding for Broadcom iProc architecture based
clock controller

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 brcm,iproc-clocks.txt |  178 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 178 insertions(+)
 create mode 100644 brcm,iproc-clocks.txt

diff --git a/brcm,iproc-clocks.txt b/brcm,iproc-clocks.txt
new file mode 100644
index 0000000..cc64fd2
--- /dev/null
+++ b/brcm,iproc-clocks.txt
@@ -0,0 +1,178 @@
+Broadcom iProc Family Clocks
+
+This binding uses the common clock binding:
+    Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+The iProc clock controller manages clocks that are common to the iProc family.
+An SoC from the iProc family may have several PPLs, e.g., ARMPLL, GENPLL,
+LCPLL0, MIPIPLL, and etc., all derived from an onboard crystal. Each PLL
+comprises of several leaf clocks
+
+Required properties for PLLs:
+- compatible:
+    Should have a value of the form "brcm,<soc>-<pll>". For example, GENPLL on
+Cygnus has a compatible string of "brcm,cygnus-genpll"
+
+- #clock-cells:
+    Must be <0>
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL
+
+- clocks:
+    The input parent clock phandle for the PLL. For all iProc PLLs, this is an
+onboard crystal with a fixed rate
+
+Optional Properties for PLLs:
+- clock-frequency:
+    PLL frequency in Hz. If specified, PLL will be configured to run at
+<clock-frequency> instead of the default frequency after chip reset, provided
+that <clock-frequency> and its parameters are defined in the SoC specific
+frequency parameter table
+
+Example:
+
+	osc: oscillator {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <25000000>;
+	};
+
+	genpll: genpll {
+		#clock-cells = <0>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
+	};
+
+Required properties for leaf clocks of a PLL:
+
+- compatible:
+    Should have a value of the form "brcm,<soc>-<pll>-clk". For example, leaf
+clocks derived from the GENPLL on Cygnus SoC have a compatible string of
+"brcm,cygnus-genpll-clk"
+
+- #clock-cells:
+    Have a value of <1> since there are more than 1 leaf clock of a
+given PLL
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL leaf clocks
+
+- clocks:
+    The input parent PLL phandle for the leaf clock
+
+- clock-output-names:
+    An ordered list of strings defining the names of the leaf clocks
+
+Example:
+
+	genpll: genpll {
+		#clock-cells = <0>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
+	};
+
+	genpll_clks: genpll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-genpll-clk";
+		reg = <0x0301d000 0x2c>;
+		clocks = <&genpll>;
+		clock-output-names = "axi21", "250mhz", "ihost_sys",
+			"enet_sw", "audio_125", "can";
+	};
+
+Required properties for ASIU clocks:
+
+ASIU clocks are a special case. These clocks are derived directly from the
+reference clock of the onboard crystal
+
+- compatible:
+    Should have a value of the form "brcm,<soc>-asiu-clk". For example, ASIU
+clocks for Cygnus have a compatible string of "brcm,cygnus-asiu-clk"
+
+- #clock-cells:
+    Have a value of <1> since there are more than 1 ASIU clocks
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for ASIU clocks
+
+- clocks:
+    The input parent clock phandle for the ASIU clock, i.e., the onboard
+crystal
+
+- clock-output-names:
+    An ordered list of strings defining the names of the ASIU clocks
+
+Example:
+
+	osc: oscillator {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <25000000>;
+	};
+
+	asiu_clks: asiu_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-asiu-clk";
+		reg = <0x0301d048 0xc>,
+			<0x180aa024 0x4>;
+		clocks = <&osc>;
+		clock-output-names = "keypad", "adc/touch", "pwm";
+	};
+
+Cygnus
+------
+PLL and leaf clock compatible strings for Cygnus are:
+    "brcm,cygnus-armpll"
+    "brcm,cygnus-genpll"
+    "brcm,cygnus-lcpll0"
+    "brcm,cygnus-mipipll"
+    "brcm,cygnus-genpll-clk"
+    "brcm,cygnus-lcpll0-clk"
+    "brcm,cygnus-mipipll-clk"
+    "brcm,cygnus-asiu-clk"
+
+The following table defines the set of PLL/clock index and ID for Cygnus.
+These clock IDs are defined in:
+    "include/dt-bindings/clock/bcm-cygnus.h"
+
+    Clock      Source           Index   ID
+    ---        -----            -----   ---------
+    crystal    N/A              N/A     N/A
+
+    armpll     crystal          N/A     N/A
+    genpll     crystal          N/A     N/A
+    lcpll0     crystal          N/A     N/A
+    mipipll    crystal          N/A     N/A
+
+    keypad     crystal (ASIU)   0       BCM_CYGNUS_ASIU_KEYPAD_CLK
+    adc/tsc    crystal (ASIU)   1       BCM_CYGNUS_ASIU_ADC_CLK
+    pwm        crystal (ASIU)   2       BCM_CYGNUS_ASIU_PWM_CLK
+
+    axi21      genpll           0       BCM_CYGNUS_GENPLL_AXI21_CLK
+    250mhz     genpll           1       BCM_CYGNUS_GENPLL_250MHZ_CLK
+    ihost_sys  genpll           2       BCM_CYGNUS_GENPLL_IHOST_SYS_CLK
+    enet_sw    genpll           3       BCM_CYGNUS_GENPLL_ENET_SW_CLK
+    audio_125  genpll           4       BCM_CYGNUS_GENPLL_AUDIO_125_CLK
+    can        genpll           5       BCM_CYGNUS_GENPLL_CAN_CLK
+
+    pcie_phy   lcpll0           0       BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK
+    ddr_phy    lcpll0           1       BCM_CYGNUS_LCPLL0_DDR_PHY_CLK
+    sdio       lcpll0           2       BCM_CYGNUS_LCPLL0_SDIO_CLK
+    usb_phy    lcpll0           3       BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK
+    smart_card lcpll0           4       BCM_CYGNUS_LCPLL0_SMART_CARD_CLK
+    ch5        lcpll0           5       BCM_CYGNUS_LCPLL0_CH5_UNUSED
+
+    ch0_unused mipipll          0       BCM_CYGNUS_MIPIPLL_CH0_UNUSED
+    ch1_lcd    mipipll          1       BCM_CYGNUS_MIPIPLL_CH1_LCD
+    ch2_unused mipipll          2       BCM_CYGNUS_MIPIPLL_CH2_UNUSED
+    ch3_unused mipipll          3       BCM_CYGNUS_MIPIPLL_CH3_UNUSED
+    ch4_unused mipipll          4       BCM_CYGNUS_MIPIPLL_CH4_UNUSED
+    ch5_unused mipipll          5       BCM_CYGNUS_MIPIPLL_CH5_UNUSED
-- 
1.7.9.5

[PATCH v5 2/6] clk: iproc: define Broadcom iProc clock binding

[Ray Jui]

Document the device tree binding for Broadcom iProc architecture based
clock controller

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 brcm,iproc-clocks.txt |  178 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 178 insertions(+)
 create mode 100644 brcm,iproc-clocks.txt

diff --git a/brcm,iproc-clocks.txt b/brcm,iproc-clocks.txt
new file mode 100644
index 0000000..cc64fd2
--- /dev/null
+++ b/brcm,iproc-clocks.txt
@@ -0,0 +1,178 @@
+Broadcom iProc Family Clocks
+
+This binding uses the common clock binding:
+    Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+The iProc clock controller manages clocks that are common to the iProc family.
+An SoC from the iProc family may have several PPLs, e.g., ARMPLL, GENPLL,
+LCPLL0, MIPIPLL, and etc., all derived from an onboard crystal. Each PLL
+comprises of several leaf clocks
+
+Required properties for PLLs:
+- compatible:
+    Should have a value of the form "brcm,<soc>-<pll>". For example, GENPLL on
+Cygnus has a compatible string of "brcm,cygnus-genpll"
+
+- #clock-cells:
+    Must be <0>
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL
+
+- clocks:
+    The input parent clock phandle for the PLL. For all iProc PLLs, this is an
+onboard crystal with a fixed rate
+
+Optional Properties for PLLs:
+- clock-frequency:
+    PLL frequency in Hz. If specified, PLL will be configured to run at
+<clock-frequency> instead of the default frequency after chip reset, provided
+that <clock-frequency> and its parameters are defined in the SoC specific
+frequency parameter table
+
+Example:
+
+	osc: oscillator {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <25000000>;
+	};
+
+	genpll: genpll {
+		#clock-cells = <0>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
+	};
+
+Required properties for leaf clocks of a PLL:
+
+- compatible:
+    Should have a value of the form "brcm,<soc>-<pll>-clk". For example, leaf
+clocks derived from the GENPLL on Cygnus SoC have a compatible string of
+"brcm,cygnus-genpll-clk"
+
+- #clock-cells:
+    Have a value of <1> since there are more than 1 leaf clock of a
+given PLL
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL leaf clocks
+
+- clocks:
+    The input parent PLL phandle for the leaf clock
+
+- clock-output-names:
+    An ordered list of strings defining the names of the leaf clocks
+
+Example:
+
+	genpll: genpll {
+		#clock-cells = <0>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
+	};
+
+	genpll_clks: genpll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-genpll-clk";
+		reg = <0x0301d000 0x2c>;
+		clocks = <&genpll>;
+		clock-output-names = "axi21", "250mhz", "ihost_sys",
+			"enet_sw", "audio_125", "can";
+	};
+
+Required properties for ASIU clocks:
+
+ASIU clocks are a special case. These clocks are derived directly from the
+reference clock of the onboard crystal
+
+- compatible:
+    Should have a value of the form "brcm,<soc>-asiu-clk". For example, ASIU
+clocks for Cygnus have a compatible string of "brcm,cygnus-asiu-clk"
+
+- #clock-cells:
+    Have a value of <1> since there are more than 1 ASIU clocks
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for ASIU clocks
+
+- clocks:
+    The input parent clock phandle for the ASIU clock, i.e., the onboard
+crystal
+
+- clock-output-names:
+    An ordered list of strings defining the names of the ASIU clocks
+
+Example:
+
+	osc: oscillator {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <25000000>;
+	};
+
+	asiu_clks: asiu_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-asiu-clk";
+		reg = <0x0301d048 0xc>,
+			<0x180aa024 0x4>;
+		clocks = <&osc>;
+		clock-output-names = "keypad", "adc/touch", "pwm";
+	};
+
+Cygnus
+------
+PLL and leaf clock compatible strings for Cygnus are:
+    "brcm,cygnus-armpll"
+    "brcm,cygnus-genpll"
+    "brcm,cygnus-lcpll0"
+    "brcm,cygnus-mipipll"
+    "brcm,cygnus-genpll-clk"
+    "brcm,cygnus-lcpll0-clk"
+    "brcm,cygnus-mipipll-clk"
+    "brcm,cygnus-asiu-clk"
+
+The following table defines the set of PLL/clock index and ID for Cygnus.
+These clock IDs are defined in:
+    "include/dt-bindings/clock/bcm-cygnus.h"
+
+    Clock      Source           Index   ID
+    ---        -----            -----   ---------
+    crystal    N/A              N/A     N/A
+
+    armpll     crystal          N/A     N/A
+    genpll     crystal          N/A     N/A
+    lcpll0     crystal          N/A     N/A
+    mipipll    crystal          N/A     N/A
+
+    keypad     crystal (ASIU)   0       BCM_CYGNUS_ASIU_KEYPAD_CLK
+    adc/tsc    crystal (ASIU)   1       BCM_CYGNUS_ASIU_ADC_CLK
+    pwm        crystal (ASIU)   2       BCM_CYGNUS_ASIU_PWM_CLK
+
+    axi21      genpll           0       BCM_CYGNUS_GENPLL_AXI21_CLK
+    250mhz     genpll           1       BCM_CYGNUS_GENPLL_250MHZ_CLK
+    ihost_sys  genpll           2       BCM_CYGNUS_GENPLL_IHOST_SYS_CLK
+    enet_sw    genpll           3       BCM_CYGNUS_GENPLL_ENET_SW_CLK
+    audio_125  genpll           4       BCM_CYGNUS_GENPLL_AUDIO_125_CLK
+    can        genpll           5       BCM_CYGNUS_GENPLL_CAN_CLK
+
+    pcie_phy   lcpll0           0       BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK
+    ddr_phy    lcpll0           1       BCM_CYGNUS_LCPLL0_DDR_PHY_CLK
+    sdio       lcpll0           2       BCM_CYGNUS_LCPLL0_SDIO_CLK
+    usb_phy    lcpll0           3       BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK
+    smart_card lcpll0           4       BCM_CYGNUS_LCPLL0_SMART_CARD_CLK
+    ch5        lcpll0           5       BCM_CYGNUS_LCPLL0_CH5_UNUSED
+
+    ch0_unused mipipll          0       BCM_CYGNUS_MIPIPLL_CH0_UNUSED
+    ch1_lcd    mipipll          1       BCM_CYGNUS_MIPIPLL_CH1_LCD
+    ch2_unused mipipll          2       BCM_CYGNUS_MIPIPLL_CH2_UNUSED
+    ch3_unused mipipll          3       BCM_CYGNUS_MIPIPLL_CH3_UNUSED
+    ch4_unused mipipll          4       BCM_CYGNUS_MIPIPLL_CH4_UNUSED
+    ch5_unused mipipll          5       BCM_CYGNUS_MIPIPLL_CH5_UNUSED
-- 
1.7.9.5

[PATCH v5 2/6] clk: iproc: define Broadcom iProc clock binding

[Ray Jui]

Document the device tree binding for Broadcom iProc architecture based
clock controller

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 brcm,iproc-clocks.txt |  178 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 178 insertions(+)
 create mode 100644 brcm,iproc-clocks.txt

diff --git a/brcm,iproc-clocks.txt b/brcm,iproc-clocks.txt
new file mode 100644
index 0000000..cc64fd2
--- /dev/null
+++ b/brcm,iproc-clocks.txt
@@ -0,0 +1,178 @@
+Broadcom iProc Family Clocks
+
+This binding uses the common clock binding:
+    Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+The iProc clock controller manages clocks that are common to the iProc family.
+An SoC from the iProc family may have several PPLs, e.g., ARMPLL, GENPLL,
+LCPLL0, MIPIPLL, and etc., all derived from an onboard crystal. Each PLL
+comprises of several leaf clocks
+
+Required properties for PLLs:
+- compatible:
+    Should have a value of the form "brcm,<soc>-<pll>". For example, GENPLL on
+Cygnus has a compatible string of "brcm,cygnus-genpll"
+
+- #clock-cells:
+    Must be <0>
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL
+
+- clocks:
+    The input parent clock phandle for the PLL. For all iProc PLLs, this is an
+onboard crystal with a fixed rate
+
+Optional Properties for PLLs:
+- clock-frequency:
+    PLL frequency in Hz. If specified, PLL will be configured to run at
+<clock-frequency> instead of the default frequency after chip reset, provided
+that <clock-frequency> and its parameters are defined in the SoC specific
+frequency parameter table
+
+Example:
+
+	osc: oscillator {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <25000000>;
+	};
+
+	genpll: genpll {
+		#clock-cells = <0>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
+	};
+
+Required properties for leaf clocks of a PLL:
+
+- compatible:
+    Should have a value of the form "brcm,<soc>-<pll>-clk". For example, leaf
+clocks derived from the GENPLL on Cygnus SoC have a compatible string of
+"brcm,cygnus-genpll-clk"
+
+- #clock-cells:
+    Have a value of <1> since there are more than 1 leaf clock of a
+given PLL
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for the PLL leaf clocks
+
+- clocks:
+    The input parent PLL phandle for the leaf clock
+
+- clock-output-names:
+    An ordered list of strings defining the names of the leaf clocks
+
+Example:
+
+	genpll: genpll {
+		#clock-cells = <0>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
+	};
+
+	genpll_clks: genpll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-genpll-clk";
+		reg = <0x0301d000 0x2c>;
+		clocks = <&genpll>;
+		clock-output-names = "axi21", "250mhz", "ihost_sys",
+			"enet_sw", "audio_125", "can";
+	};
+
+Required properties for ASIU clocks:
+
+ASIU clocks are a special case. These clocks are derived directly from the
+reference clock of the onboard crystal
+
+- compatible:
+    Should have a value of the form "brcm,<soc>-asiu-clk". For example, ASIU
+clocks for Cygnus have a compatible string of "brcm,cygnus-asiu-clk"
+
+- #clock-cells:
+    Have a value of <1> since there are more than 1 ASIU clocks
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+clock control registers required for ASIU clocks
+
+- clocks:
+    The input parent clock phandle for the ASIU clock, i.e., the onboard
+crystal
+
+- clock-output-names:
+    An ordered list of strings defining the names of the ASIU clocks
+
+Example:
+
+	osc: oscillator {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <25000000>;
+	};
+
+	asiu_clks: asiu_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-asiu-clk";
+		reg = <0x0301d048 0xc>,
+			<0x180aa024 0x4>;
+		clocks = <&osc>;
+		clock-output-names = "keypad", "adc/touch", "pwm";
+	};
+
+Cygnus
+------
+PLL and leaf clock compatible strings for Cygnus are:
+    "brcm,cygnus-armpll"
+    "brcm,cygnus-genpll"
+    "brcm,cygnus-lcpll0"
+    "brcm,cygnus-mipipll"
+    "brcm,cygnus-genpll-clk"
+    "brcm,cygnus-lcpll0-clk"
+    "brcm,cygnus-mipipll-clk"
+    "brcm,cygnus-asiu-clk"
+
+The following table defines the set of PLL/clock index and ID for Cygnus.
+These clock IDs are defined in:
+    "include/dt-bindings/clock/bcm-cygnus.h"
+
+    Clock      Source           Index   ID
+    ---        -----            -----   ---------
+    crystal    N/A              N/A     N/A
+
+    armpll     crystal          N/A     N/A
+    genpll     crystal          N/A     N/A
+    lcpll0     crystal          N/A     N/A
+    mipipll    crystal          N/A     N/A
+
+    keypad     crystal (ASIU)   0       BCM_CYGNUS_ASIU_KEYPAD_CLK
+    adc/tsc    crystal (ASIU)   1       BCM_CYGNUS_ASIU_ADC_CLK
+    pwm        crystal (ASIU)   2       BCM_CYGNUS_ASIU_PWM_CLK
+
+    axi21      genpll           0       BCM_CYGNUS_GENPLL_AXI21_CLK
+    250mhz     genpll           1       BCM_CYGNUS_GENPLL_250MHZ_CLK
+    ihost_sys  genpll           2       BCM_CYGNUS_GENPLL_IHOST_SYS_CLK
+    enet_sw    genpll           3       BCM_CYGNUS_GENPLL_ENET_SW_CLK
+    audio_125  genpll           4       BCM_CYGNUS_GENPLL_AUDIO_125_CLK
+    can        genpll           5       BCM_CYGNUS_GENPLL_CAN_CLK
+
+    pcie_phy   lcpll0           0       BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK
+    ddr_phy    lcpll0           1       BCM_CYGNUS_LCPLL0_DDR_PHY_CLK
+    sdio       lcpll0           2       BCM_CYGNUS_LCPLL0_SDIO_CLK
+    usb_phy    lcpll0           3       BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK
+    smart_card lcpll0           4       BCM_CYGNUS_LCPLL0_SMART_CARD_CLK
+    ch5        lcpll0           5       BCM_CYGNUS_LCPLL0_CH5_UNUSED
+
+    ch0_unused mipipll          0       BCM_CYGNUS_MIPIPLL_CH0_UNUSED
+    ch1_lcd    mipipll          1       BCM_CYGNUS_MIPIPLL_CH1_LCD
+    ch2_unused mipipll          2       BCM_CYGNUS_MIPIPLL_CH2_UNUSED
+    ch3_unused mipipll          3       BCM_CYGNUS_MIPIPLL_CH3_UNUSED
+    ch4_unused mipipll          4       BCM_CYGNUS_MIPIPLL_CH4_UNUSED
+    ch5_unused mipipll          5       BCM_CYGNUS_MIPIPLL_CH5_UNUSED
-- 
1.7.9.5

[PATCH v5 3/6] clk: iproc: add initial common clock support

[Ray Jui]

This adds basic and generic support for various iProc PLLs and clocks
including the ARMPLL, GENPLL, LCPLL, MIPIPLL, and ASIU clocks.

SoCs under the iProc architecture can define their specific register
offsets and clock parameters for their PLL and clock controllers. These
parameters can be passed as arugments into the generic iProc PLL and
clock setup functions

Derived from code originally provided by Jonathan Richardson
<jonathar@broadcom.com>

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/clk/bcm/Kconfig            |    9 +
 drivers/clk/bcm/Makefile           |    1 +
 drivers/clk/bcm/clk-iproc-armpll.c |  282 ++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc-asiu.c   |  275 +++++++++++++++++++++
 drivers/clk/bcm/clk-iproc-clk.c    |  238 +++++++++++++++++++
 drivers/clk/bcm/clk-iproc-pll.c    |  461 ++++++++++++++++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc.h        |  157 ++++++++++++
 7 files changed, 1423 insertions(+)
 create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
 create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
 create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
 create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
 create mode 100644 drivers/clk/bcm/clk-iproc.h

diff --git a/drivers/clk/bcm/Kconfig b/drivers/clk/bcm/Kconfig
index 75506e5..66b5b7f 100644
--- a/drivers/clk/bcm/Kconfig
+++ b/drivers/clk/bcm/Kconfig
@@ -7,3 +7,12 @@ config CLK_BCM_KONA
 	  Enable common clock framework support for Broadcom SoCs
 	  using "Kona" style clock control units, including those
 	  in the BCM281xx and BCM21664 families.
+
+config COMMON_CLK_IPROC
+	bool "Broadcom iProc clock support"
+	depends on ARCH_BCM_IPROC
+	depends on COMMON_CLK
+	default y
+	help
+	  Enable common clock framework support for Broadcom SoCs
+	  based on the "iProc" architecture
diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
index 6297d05..6926636 100644
--- a/drivers/clk/bcm/Makefile
+++ b/drivers/clk/bcm/Makefile
@@ -2,3 +2,4 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
+obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
diff --git a/drivers/clk/bcm/clk-iproc-armpll.c b/drivers/clk/bcm/clk-iproc-armpll.c
new file mode 100644
index 0000000..965cd4e
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-armpll.c
@@ -0,0 +1,282 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+
+#define IPROC_CLK_MAX_FREQ_POLICY                    0x3
+#define IPROC_CLK_POLICY_FREQ_OFFSET                 0x008
+#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT      8
+#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK       0x7
+
+#define IPROC_CLK_PLLARMA_OFFSET                     0xc00
+#define IPROC_CLK_PLLARMA_LOCK_SHIFT                 28
+#define IPROC_CLK_PLLARMA_PDIV_SHIFT                 24
+#define IPROC_CLK_PLLARMA_PDIV_MASK                  0xf
+#define IPROC_CLK_PLLARMA_NDIV_INT_SHIFT             8
+#define IPROC_CLK_PLLARMA_NDIV_INT_MASK              0x3ff
+
+#define IPROC_CLK_PLLARMB_OFFSET                     0xc04
+#define IPROC_CLK_PLLARMB_NDIV_FRAC_MASK             0xfffff
+
+#define IPROC_CLK_PLLARMC_OFFSET                     0xc08
+#define IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT            8
+#define IPROC_CLK_PLLARMC_MDIV_MASK                  0xff
+
+#define IPROC_CLK_PLLARMCTL5_OFFSET                  0xc20
+#define IPROC_CLK_PLLARMCTL5_H_MDIV_MASK             0xff
+
+#define IPROC_CLK_PLLARM_OFFSET_OFFSET               0xc24
+#define IPROC_CLK_PLLARM_SW_CTL_SHIFT                29
+#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT       20
+#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK        0xff
+#define IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK       0xfffff
+
+#define IPROC_CLK_ARM_DIV_OFFSET                     0xe00
+#define IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT  4
+#define IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK        0xf
+
+#define IPROC_CLK_POLICY_DBG_OFFSET                  0xec0
+#define IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT          12
+#define IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK           0x7
+
+enum iproc_arm_pll_fid {
+	ARM_PLL_FID_CRYSTAL_CLK   = 0,
+	ARM_PLL_FID_SYS_CLK       = 2,
+	ARM_PLL_FID_CH0_SLOW_CLK  = 6,
+	ARM_PLL_FID_CH1_FAST_CLK  = 7
+};
+
+struct iproc_arm_pll {
+	struct clk_hw hw;
+	void __iomem *base;
+	unsigned long rate;
+};
+
+#define to_iproc_arm_pll(hw) container_of(hw, struct iproc_arm_pll, hw)
+
+static unsigned int __get_fid(struct iproc_arm_pll *pll)
+{
+	u32 val;
+	unsigned int policy, fid, active_fid;
+
+	val = readl(pll->base + IPROC_CLK_ARM_DIV_OFFSET);
+	if (val & (1 << IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT))
+		policy = val & IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK;
+	else
+		policy = 0;
+
+	/* something is seriously wrong */
+	BUG_ON(policy > IPROC_CLK_MAX_FREQ_POLICY);
+
+	val = readl(pll->base + IPROC_CLK_POLICY_FREQ_OFFSET);
+	fid = (val >> (IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT * policy)) &
+		IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK;
+
+	val = readl(pll->base + IPROC_CLK_POLICY_DBG_OFFSET);
+	active_fid = IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK &
+		(val >> IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT);
+	if (fid != active_fid) {
+		pr_debug("%s: fid override %u->%u\n", __func__,	fid,
+				active_fid);
+		fid = active_fid;
+	}
+
+	pr_debug("%s: active fid: %u\n", __func__, fid);
+
+	return fid;
+}
+
+/*
+ * Determine the mdiv (post divider) based on the frequency ID being used.
+ * There are 4 sources that can be used to derive the output clock rate:
+ *    - 25 MHz Crystal
+ *    - System clock
+ *    - PLL channel 0 (slow clock)
+ *    - PLL channel 1 (fast clock)
+ */
+static int __get_mdiv(struct iproc_arm_pll *pll)
+{
+	unsigned int fid;
+	int mdiv;
+	u32 val;
+
+	fid = __get_fid(pll);
+
+	switch (fid) {
+	case ARM_PLL_FID_CRYSTAL_CLK:
+	case ARM_PLL_FID_SYS_CLK:
+		mdiv = 1;
+		break;
+
+	case ARM_PLL_FID_CH0_SLOW_CLK:
+		val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
+		mdiv = val & IPROC_CLK_PLLARMC_MDIV_MASK;
+		if (mdiv == 0)
+			mdiv = 256;
+		break;
+
+	case ARM_PLL_FID_CH1_FAST_CLK:
+		val = readl(pll->base +	IPROC_CLK_PLLARMCTL5_OFFSET);
+		mdiv = val & IPROC_CLK_PLLARMCTL5_H_MDIV_MASK;
+		if (mdiv == 0)
+			mdiv = 256;
+		break;
+
+	default:
+		mdiv = -EFAULT;
+	}
+
+	return mdiv;
+}
+
+static unsigned int __get_ndiv(struct iproc_arm_pll *pll)
+{
+	u32 val;
+	unsigned int ndiv_int, ndiv_frac, ndiv;
+
+	val = readl(pll->base + IPROC_CLK_PLLARM_OFFSET_OFFSET);
+	if (val & (1 << IPROC_CLK_PLLARM_SW_CTL_SHIFT)) {
+		/*
+		 * offset mode is active. Read the ndiv from the PLLARM OFFSET
+		 * register
+		 */
+		ndiv_int = (val >> IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT) &
+			IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK;
+		if (ndiv_int == 0)
+			ndiv_int = 256;
+
+		ndiv_frac = val & IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK;
+	} else {
+		/* offset mode not active */
+		val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
+		ndiv_int = (val >> IPROC_CLK_PLLARMA_NDIV_INT_SHIFT) &
+			IPROC_CLK_PLLARMA_NDIV_INT_MASK;
+		if (ndiv_int == 0)
+			ndiv_int = 1024;
+
+		val = readl(pll->base + IPROC_CLK_PLLARMB_OFFSET);
+		ndiv_frac = val & IPROC_CLK_PLLARMB_NDIV_FRAC_MASK;
+	}
+
+	ndiv = (ndiv_int << 20) | ndiv_frac;
+
+	return ndiv;
+}
+
+/*
+ * The output frequency of the ARM PLL is calculated based on the ARM PLL
+ * divider values:
+ *   pdiv = ARM PLL pre-divider
+ *   ndiv = ARM PLL multiplier
+ *   mdiv = ARM PLL post divider
+ *
+ * The frequency is calculated by:
+ *   ((ndiv * parent clock rate) / pdiv) / mdiv
+ */
+static unsigned long iproc_arm_pll_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_arm_pll *pll = to_iproc_arm_pll(hw);
+	u32 val;
+	int mdiv;
+	u64 ndiv;
+	unsigned int pdiv;
+
+	/* in bypass mode, use parent rate */
+	val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
+	if (val & (1 << IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT)) {
+		pll->rate = parent_rate;
+		return pll->rate;
+	}
+
+	/* PLL needs to be locked */
+	val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
+	if (!(val & (1 << IPROC_CLK_PLLARMA_LOCK_SHIFT))) {
+		pll->rate = 0;
+		return 0;
+	}
+
+	pdiv = (val >> IPROC_CLK_PLLARMA_PDIV_SHIFT) &
+		IPROC_CLK_PLLARMA_PDIV_MASK;
+	if (pdiv == 0)
+		pdiv = 16;
+
+	ndiv = __get_ndiv(pll);
+	mdiv = __get_mdiv(pll);
+	if (mdiv <= 0) {
+		pll->rate = 0;
+		return 0;
+	}
+	pll->rate = (ndiv * parent_rate) >> 20;
+	pll->rate = (pll->rate / pdiv) / mdiv;
+
+	pr_debug("%s: ARM PLL rate: %lu. parent rate: %lu\n", __func__,
+			pll->rate, parent_rate);
+	pr_debug("%s: ndiv_int: %u, pdiv: %u, mdiv: %d\n", __func__,
+			(unsigned int)(ndiv >> 20), pdiv, mdiv);
+
+	return pll->rate;
+}
+
+static const struct clk_ops iproc_arm_pll_ops = {
+	.recalc_rate = iproc_arm_pll_recalc_rate,
+};
+
+void __init iproc_armpll_setup(struct device_node *node)
+{
+	int ret;
+	struct clk *clk;
+	struct iproc_arm_pll *pll;
+	struct clk_init_data init;
+	const char *parent_name;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->base = of_iomap(node, 0);
+	if (WARN_ON(!pll->base))
+		goto err_free_pll;
+
+	init.name = node->name;
+	init.ops = &iproc_arm_pll_ops;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	pll->hw.init = &init;
+
+	clk = clk_register(NULL, &pll->hw);
+	if (WARN_ON(IS_ERR(clk)))
+		goto err_iounmap;
+
+	ret = of_clk_add_provider(node, of_clk_src_simple_get, clk);
+	if (WARN_ON(ret))
+		goto err_clk_unregister;
+
+	return;
+
+err_clk_unregister:
+	clk_unregister(clk);
+err_iounmap:
+	iounmap(pll->base);
+err_free_pll:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc-asiu.c b/drivers/clk/bcm/clk-iproc-asiu.c
new file mode 100644
index 0000000..ab86b8c
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-asiu.c
@@ -0,0 +1,275 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+struct iproc_asiu;
+
+struct iproc_asiu_clk {
+	struct clk_hw hw;
+	const char *name;
+	struct iproc_asiu *asiu;
+	unsigned long rate;
+	struct iproc_asiu_div div;
+	struct iproc_asiu_gate gate;
+};
+
+struct iproc_asiu {
+	void __iomem *div_base;
+	void __iomem *gate_base;
+
+	struct clk_onecell_data clk_data;
+	struct iproc_asiu_clk *clks;
+};
+
+#define to_asiu_clk(hw) container_of(hw, struct iproc_asiu_clk, hw)
+
+static int iproc_asiu_clk_enable(struct clk_hw *hw)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+
+	/* some clocks at the ASIU level are always enabled */
+	if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
+		return 0;
+
+	val = readl(asiu->gate_base + clk->gate.offset);
+	val |= (1 << clk->gate.en_shift);
+	writel(val, asiu->gate_base + clk->gate.offset);
+
+	return 0;
+}
+
+static void iproc_asiu_clk_disable(struct clk_hw *hw)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+
+	/* some clocks at the ASIU level are always enabled */
+	if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
+		return;
+
+	val = readl(asiu->gate_base + clk->gate.offset);
+	val &= ~(1 << clk->gate.en_shift);
+	writel(val, asiu->gate_base + clk->gate.offset);
+}
+
+static unsigned long iproc_asiu_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+	unsigned int div_h, div_l;
+
+	if (parent_rate == 0) {
+		clk->rate = 0;
+		return 0;
+	}
+
+	/* if clock divisor is not enabled, simply return parent rate */
+	val = readl(asiu->div_base + clk->div.offset);
+	if ((val & (1 << clk->div.en_shift)) == 0) {
+		clk->rate = parent_rate;
+		return parent_rate;
+	}
+
+	/* clock rate = parent rate / (high_div + 1) + (low_div + 1) */
+	div_h = (val >> clk->div.high_shift) & bit_mask(clk->div.high_width);
+	div_h++;
+	div_l = (val >> clk->div.low_shift) & bit_mask(clk->div.low_width);
+	div_l++;
+
+	clk->rate = parent_rate / (div_h + div_l);
+	pr_debug("%s: rate: %lu. parent rate: %lu div_h: %u div_l: %u\n",
+		__func__, clk->rate, parent_rate, div_h, div_l);
+
+	return clk->rate;
+}
+
+static long iproc_asiu_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	unsigned int div;
+
+	if (rate == 0 || *parent_rate == 0)
+		return -EINVAL;
+
+	if (rate == *parent_rate)
+		return *parent_rate;
+
+	div = DIV_ROUND_UP(*parent_rate, rate);
+	if (div < 2)
+		return *parent_rate;
+
+	return *parent_rate / div;
+}
+
+static int iproc_asiu_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	unsigned int div, div_h, div_l;
+	u32 val;
+
+	if (rate == 0 || parent_rate == 0)
+		return -EINVAL;
+
+	/* simply disable the divisor if one wants the same rate as parent */
+	if (rate == parent_rate) {
+		val = readl(asiu->div_base + clk->div.offset);
+		val &= ~(1 << clk->div.en_shift);
+		writel(val, asiu->div_base + clk->div.offset);
+		return 0;
+	}
+
+	div = DIV_ROUND_UP(parent_rate, rate);
+	if (div < 2)
+		return -EINVAL;
+
+	div_h = div_l = div >> 1;
+	div_h--;
+	div_l--;
+
+	val = readl(asiu->div_base + clk->div.offset);
+	val |= 1 << clk->div.en_shift;
+	if (div_h) {
+		val &= ~(bit_mask(clk->div.high_width)
+				<< clk->div.high_shift);
+		val |= div_h << clk->div.high_shift;
+	} else {
+		val &= ~(bit_mask(clk->div.high_width)
+				<< clk->div.high_shift);
+	}
+	if (div_l) {
+		val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
+		val |= div_l << clk->div.low_shift;
+	} else {
+		val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
+	}
+	writel(val, asiu->div_base + clk->div.offset);
+
+	return 0;
+}
+
+static const struct clk_ops iproc_asiu_ops = {
+	.enable = iproc_asiu_clk_enable,
+	.disable = iproc_asiu_clk_disable,
+	.recalc_rate = iproc_asiu_clk_recalc_rate,
+	.round_rate = iproc_asiu_clk_round_rate,
+	.set_rate = iproc_asiu_clk_set_rate,
+};
+
+void __init iproc_asiu_setup(struct device_node *node,
+		const struct iproc_asiu_div *div,
+		const struct iproc_asiu_gate *gate, unsigned int num_clks)
+{
+	int i, ret;
+	struct iproc_asiu *asiu;
+
+	if (WARN_ON(!gate || !div))
+		return;
+
+	asiu = kzalloc(sizeof(*asiu), GFP_KERNEL);
+	if (WARN_ON(!asiu))
+		return;
+
+	asiu->clk_data.clk_num = num_clks;
+	asiu->clk_data.clks = kcalloc(num_clks, sizeof(*asiu->clk_data.clks),
+			GFP_KERNEL);
+	if (WARN_ON(!asiu->clk_data.clks))
+		goto err_clks;
+
+	asiu->clks = kcalloc(num_clks, sizeof(*asiu->clks), GFP_KERNEL);
+	if (WARN_ON(!asiu->clks))
+		goto err_asiu_clks;
+
+	asiu->div_base = of_iomap(node, 0);
+	if (WARN_ON(!asiu->div_base))
+		goto err_iomap_div;
+
+	asiu->gate_base = of_iomap(node, 1);
+	if (WARN_ON(!asiu->gate_base))
+		goto err_iomap_gate;
+
+	for (i = 0; i < num_clks; i++) {
+		struct clk_init_data init;
+		struct clk *clk;
+		const char *parent_name;
+		struct iproc_asiu_clk *asiu_clk;
+		const char *clk_name;
+
+		clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
+		if (WARN_ON(!clk_name))
+			goto err_clk_register;
+
+		ret = of_property_read_string_index(node, "clock-output-names",
+				i, &clk_name);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+
+		asiu_clk = &asiu->clks[i];
+		asiu_clk->name = clk_name;
+		asiu_clk->asiu = asiu;
+		asiu_clk->div = div[i];
+		asiu_clk->gate = gate[i];
+		init.name = clk_name;
+		init.ops = &iproc_asiu_ops;
+		init.flags = 0;
+		parent_name = of_clk_get_parent_name(node, 0);
+		init.parent_names = (parent_name ? &parent_name : NULL);
+		init.num_parents = (parent_name ? 1 : 0);
+		asiu_clk->hw.init = &init;
+
+		clk = clk_register(NULL, &asiu_clk->hw);
+		if (WARN_ON(IS_ERR(clk)))
+			goto err_clk_register;
+		asiu->clk_data.clks[i] = clk;
+	}
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get,
+			&asiu->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_register;
+
+	return;
+
+err_clk_register:
+	for (i = 0; i < num_clks; i++)
+		kfree(asiu->clks[i].name);
+	iounmap(asiu->gate_base);
+
+err_iomap_gate:
+	iounmap(asiu->div_base);
+
+err_iomap_div:
+	kfree(asiu->clks);
+
+err_asiu_clks:
+	kfree(asiu->clk_data.clks);
+
+err_clks:
+	kfree(asiu);
+}
diff --git a/drivers/clk/bcm/clk-iproc-clk.c b/drivers/clk/bcm/clk-iproc-clk.c
new file mode 100644
index 0000000..be3c42c
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-clk.c
@@ -0,0 +1,238 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+struct iproc_pll;
+
+struct iproc_clk {
+	struct clk_hw hw;
+	const char *name;
+	struct iproc_pll *pll;
+	unsigned long rate;
+	const struct iproc_clk_ctrl *ctrl;
+};
+
+struct iproc_pll {
+	void __iomem *base;
+	struct clk_onecell_data clk_data;
+	struct iproc_clk *clks;
+};
+
+#define to_iproc_clk(hw) container_of(hw, struct iproc_clk, hw)
+
+static int iproc_clk_enable(struct clk_hw *hw)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+
+	/* channel enable is active low */
+	val = readl(pll->base + ctrl->enable.offset);
+	val &= ~(1 << ctrl->enable.enable_shift);
+	writel(val, pll->base + ctrl->enable.offset);
+
+	/* also make sure channel is not held */
+	val = readl(pll->base + ctrl->enable.offset);
+	val &= ~(1 << ctrl->enable.hold_shift);
+	writel(val, pll->base + ctrl->enable.offset);
+
+	return 0;
+}
+
+static void iproc_clk_disable(struct clk_hw *hw)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+
+	if (ctrl->flags & IPROC_CLK_AON)
+		return;
+
+	val = readl(pll->base + ctrl->enable.offset);
+	val |= 1 << ctrl->enable.enable_shift;
+	writel(val, pll->base + ctrl->enable.offset);
+}
+
+static unsigned long iproc_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+	unsigned int mdiv;
+
+	if (parent_rate == 0)
+		return 0;
+
+	val = readl(pll->base + ctrl->mdiv.offset);
+	mdiv = (val >> ctrl->mdiv.shift) & bit_mask(ctrl->mdiv.width);
+	if (mdiv == 0)
+		mdiv = 256;
+
+	clk->rate = parent_rate / mdiv;
+
+	return clk->rate;
+}
+
+static long iproc_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	unsigned int div;
+
+	if (rate == 0 || *parent_rate == 0)
+		return -EINVAL;
+
+	if (rate == *parent_rate)
+		return *parent_rate;
+
+	div = DIV_ROUND_UP(*parent_rate, rate);
+	if (div < 2)
+		return *parent_rate;
+
+	if (div > 256)
+		div = 256;
+
+	return *parent_rate / div;
+}
+
+static int iproc_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+	unsigned int div;
+
+	if (rate == 0 || parent_rate == 0)
+		return -EINVAL;
+
+	div = DIV_ROUND_UP(parent_rate, rate);
+	if (div > 256)
+		return -EINVAL;
+
+	val = readl(pll->base + ctrl->mdiv.offset);
+	if (div == 256) {
+		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
+	} else {
+		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
+		val |= div << ctrl->mdiv.shift;
+	}
+	writel(val, pll->base + ctrl->mdiv.offset);
+	clk->rate = parent_rate / div;
+
+	return 0;
+}
+
+static const struct clk_ops iproc_clk_ops = {
+	.enable = iproc_clk_enable,
+	.disable = iproc_clk_disable,
+	.recalc_rate = iproc_clk_recalc_rate,
+	.round_rate = iproc_clk_round_rate,
+	.set_rate = iproc_clk_set_rate,
+};
+
+void __init iproc_clk_setup(struct device_node *node,
+		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks)
+{
+	int i, ret;
+	struct iproc_pll *pll;
+
+	if (WARN_ON(!ctrl))
+		return;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->clk_data.clk_num = num_clks;
+	pll->clk_data.clks = kcalloc(num_clks, sizeof(*pll->clk_data.clks),
+			GFP_KERNEL);
+	if (WARN_ON(!pll->clk_data.clks))
+		goto err_clks;
+
+	pll->clks = kcalloc(num_clks, sizeof(*pll->clks), GFP_KERNEL);
+	if (WARN_ON(!pll->clks))
+		goto err_pll_clks;
+
+	pll->base = of_iomap(node, 0);
+	if (WARN_ON(!pll->base))
+		goto err_iomap;
+
+	for (i = 0; i < num_clks; i++) {
+		struct clk_init_data init;
+		struct clk *clk;
+		const char *parent_name;
+		struct iproc_clk *iclk;
+		const char *clk_name;
+
+		clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
+		if (WARN_ON(!clk_name))
+			goto err_clk_register;
+
+		ret = of_property_read_string_index(node, "clock-output-names",
+				i, &clk_name);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+
+		iclk = &pll->clks[i];
+		iclk->name = clk_name;
+		iclk->pll = pll;
+		iclk->ctrl = &ctrl[i];
+		init.name = clk_name;
+		init.ops = &iproc_clk_ops;
+		init.flags = 0;
+		parent_name = of_clk_get_parent_name(node, 0);
+		init.parent_names = (parent_name ? &parent_name : NULL);
+		init.num_parents = (parent_name ? 1 : 0);
+		iclk->hw.init = &init;
+
+		clk = clk_register(NULL, &iclk->hw);
+		if (WARN_ON(IS_ERR(clk)))
+			goto err_clk_register;
+		pll->clk_data.clks[i] = clk;
+	}
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_register;
+
+	return;
+
+err_clk_register:
+	for (i = 0; i < num_clks; i++)
+		kfree(pll->clks[i].name);
+	iounmap(pll->base);
+
+err_iomap:
+	kfree(pll->clks);
+
+err_pll_clks:
+	kfree(pll->clk_data.clks);
+
+err_clks:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc-pll.c b/drivers/clk/bcm/clk-iproc-pll.c
new file mode 100644
index 0000000..3b82cbd
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-pll.c
@@ -0,0 +1,461 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+#define PLL_VCO_HIGH_SHIFT 19
+#define PLL_VCO_LOW_SHIFT  30
+
+/* number of delay loops waiting for PLL to lock */
+#define LOCK_DELAY 100
+
+/* number of VCO frequency bands */
+#define NUM_FREQ_BANDS 8
+
+#define NUM_KP_BANDS 3
+enum kp_band {
+	KP_BAND_MID = 0,
+	KP_BAND_HIGH,
+	KP_BAND_HIGH_HIGH
+};
+
+static const unsigned int kp_table[NUM_KP_BANDS][NUM_FREQ_BANDS] = {
+	{ 5, 6, 6, 7, 7, 8, 9, 10 },
+	{ 4, 4, 5, 5, 6, 7, 8, 9  },
+	{ 4, 5, 5, 6, 7, 8, 9, 10 },
+};
+
+static const unsigned long ref_freq_table[NUM_FREQ_BANDS][2] = {
+	{ 10000000,  12500000  },
+	{ 12500000,  15000000  },
+	{ 15000000,  20000000  },
+	{ 20000000,  25000000  },
+	{ 25000000,  50000000  },
+	{ 50000000,  75000000  },
+	{ 75000000,  100000000 },
+	{ 100000000, 125000000 },
+};
+
+enum vco_freq_range {
+	VCO_LOW       = 700000000U,
+	VCO_MID       = 1200000000U,
+	VCO_HIGH      = 2200000000U,
+	VCO_HIGH_HIGH = 3100000000U,
+	VCO_MAX       = 4000000000U,
+};
+
+struct iproc_pll {
+	struct clk_hw hw;
+	void __iomem *pll_base;
+	void __iomem *pwr_base;
+	void __iomem *asiu_base;
+	const char *name;
+	const struct iproc_pll_ctrl *ctrl;
+	const struct iproc_pll_vco_freq_param *vco_param;
+	unsigned int num_vco_entries;
+	unsigned long rate;
+};
+
+#define to_iproc_pll(hw) container_of(hw, struct iproc_pll, hw)
+
+/*
+ * Based on the target frequency, find a match from the VCO frequency parameter
+ * table and return its index
+ */
+static int pll_get_rate_index(struct iproc_pll *pll, unsigned int target_rate)
+{
+	int i;
+
+	for (i = 0; i < pll->num_vco_entries; i++)
+		if (target_rate == pll->vco_param[i].rate)
+			break;
+
+	if (i >= pll->num_vco_entries)
+		return -EINVAL;
+
+	return i;
+}
+
+static int get_kp(unsigned long ref_freq, enum kp_band kp_index)
+{
+	int i;
+
+	if (ref_freq < ref_freq_table[0][0])
+		return -EINVAL;
+
+	for (i = 0; i < NUM_FREQ_BANDS; i++) {
+		if (ref_freq >= ref_freq_table[i][0] &&
+			ref_freq < ref_freq_table[i][1])
+			return kp_table[kp_index][i];
+	}
+	return -EINVAL;
+}
+
+static int pll_wait_for_lock(struct iproc_pll *pll)
+{
+	int i;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+
+	for (i = 0; i < LOCK_DELAY; i++) {
+		u32 val = readl(pll->pll_base + ctrl->status.offset);
+
+		if (val & (1 << ctrl->status.shift))
+			return 0;
+		udelay(10);
+	}
+
+	return -EIO;
+}
+
+static void __pll_disable(struct iproc_pll *pll)
+{
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		val = readl(pll->asiu_base + ctrl->asiu.offset);
+		val &= ~(1 << ctrl->asiu.en_shift);
+		writel(val, pll->asiu_base + ctrl->asiu.offset);
+	}
+
+	/* latch input value so core power can be shut down */
+	val = readl(pll->pwr_base + ctrl->aon.offset);
+	val |= (1 << ctrl->aon.iso_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+
+	/* power down the core */
+	val &= ~(bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+}
+
+static int __pll_enable(struct iproc_pll *pll)
+{
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+
+	/* power up the PLL and make sure it's not latched */
+	val = readl(pll->pwr_base + ctrl->aon.offset);
+	val |= bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift;
+	val &= ~(1 << ctrl->aon.iso_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+
+	/* certain PLLs also need to be ungated from the ASIU top level */
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		val = readl(pll->asiu_base + ctrl->asiu.offset);
+		val |= (1 << ctrl->asiu.en_shift);
+		writel(val, pll->asiu_base + ctrl->asiu.offset);
+	}
+
+	return 0;
+}
+
+static void __pll_put_in_reset(struct iproc_pll *pll)
+{
+	u32 val;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
+
+	val = readl(pll->pll_base + reset->offset);
+	val &= ~(1 << reset->reset_shift | 1 << reset->p_reset_shift);
+	writel(val, pll->pll_base + reset->offset);
+}
+
+static void __pll_bring_out_reset(struct iproc_pll *pll, unsigned int kp,
+		unsigned int ka, unsigned int ki)
+{
+	u32 val;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
+
+	val = readl(pll->pll_base + reset->offset);
+	val &= ~(bit_mask(reset->ki_width) << reset->ki_shift |
+		bit_mask(reset->kp_width) << reset->kp_shift |
+		bit_mask(reset->ka_width) << reset->ka_shift);
+	val |=  ki << reset->ki_shift | kp << reset->kp_shift |
+		ka << reset->ka_shift;
+	val |= 1 << reset->reset_shift | 1 << reset->p_reset_shift;
+	writel(val, pll->pll_base + reset->offset);
+}
+
+static int pll_set_rate(struct iproc_pll *pll, unsigned int rate_index,
+		unsigned long parent_rate)
+{
+	const struct iproc_pll_vco_freq_param *vco =
+				&pll->vco_param[rate_index];
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	int ka = 0, ki, kp, ret;
+	unsigned long rate = vco->rate;
+	u32 val;
+	enum kp_band kp_index;
+	unsigned long ref_freq;
+
+	/*
+	 * reference frequency = parent frequency / PDIV
+	 * If PDIV = 0, then it becomes a multiplier (x2)
+	 */
+	if (vco->pdiv == 0)
+		ref_freq = parent_rate * 2;
+	else
+		ref_freq = parent_rate / vco->pdiv;
+
+	/* determine Ki and Kp index based on target VCO frequency */
+	if (rate >= VCO_LOW && rate < VCO_HIGH) {
+		ki = 4;
+		kp_index = KP_BAND_MID;
+	} else if (rate >= VCO_HIGH && rate && rate < VCO_HIGH_HIGH) {
+		ki = 3;
+		kp_index = KP_BAND_HIGH;
+	} else if (rate >= VCO_HIGH_HIGH && rate < VCO_MAX) {
+		ki = 3;
+		kp_index = KP_BAND_HIGH_HIGH;
+	} else {
+		pr_err("%s: pll: %s has invalid rate: %lu\n", __func__,
+				pll->name, rate);
+		return -EINVAL;
+	}
+
+	kp = get_kp(ref_freq, kp_index);
+	if (kp < 0) {
+		pr_err("%s: pll: %s has invalid kp\n", __func__, pll->name);
+		return kp;
+	}
+
+	ret = __pll_enable(pll);
+	if (ret) {
+		pr_err("%s: pll: %s fails to enable\n", __func__, pll->name);
+		return ret;
+	}
+
+	/* put PLL in reset */
+	__pll_put_in_reset(pll);
+
+	writel(0, pll->pll_base + ctrl->vco_ctrl.u_offset);
+	val = readl(pll->pll_base + ctrl->vco_ctrl.l_offset);
+
+	if (rate >= VCO_LOW && rate < VCO_MID)
+		val |= (1 << PLL_VCO_LOW_SHIFT);
+
+	if (rate < VCO_HIGH)
+		val &= ~(1 << PLL_VCO_HIGH_SHIFT);
+	else
+		val |= (1 << PLL_VCO_HIGH_SHIFT);
+
+	writel(val, pll->pll_base + ctrl->vco_ctrl.l_offset);
+
+	/* program integer part of NDIV */
+	val = readl(pll->pll_base + ctrl->ndiv_int.offset);
+	val &= ~(bit_mask(ctrl->ndiv_int.width) << ctrl->ndiv_int.shift);
+	val |= vco->ndiv_int << ctrl->ndiv_int.shift;
+	writel(val, pll->pll_base + ctrl->ndiv_int.offset);
+
+	/* program fractional part of NDIV */
+	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
+		val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
+		val &= ~(bit_mask(ctrl->ndiv_frac.width) <<
+				ctrl->ndiv_frac.shift);
+		val |= vco->ndiv_frac << ctrl->ndiv_frac.shift;
+		writel(val, pll->pll_base + ctrl->ndiv_frac.offset);
+	}
+
+	/* program PDIV */
+	val = readl(pll->pll_base + ctrl->pdiv.offset);
+	val &= ~(bit_mask(ctrl->pdiv.width) << ctrl->pdiv.shift);
+	val |= vco->pdiv << ctrl->pdiv.shift;
+	writel(val, pll->pll_base + ctrl->pdiv.offset);
+
+	__pll_bring_out_reset(pll, kp, ka, ki);
+
+	ret = pll_wait_for_lock(pll);
+	if (ret < 0) {
+		pr_err("%s: pll: %s failed to lock\n", __func__, pll->name);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int iproc_pll_enable(struct clk_hw *hw)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+
+	return __pll_enable(pll);
+}
+
+static void iproc_pll_disable(struct clk_hw *hw)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+
+	if (ctrl->flags & IPROC_CLK_AON)
+		return;
+
+	__pll_disable(pll);
+}
+
+static unsigned long iproc_pll_recalc_rate(struct clk_hw *hw,
+	unsigned long parent_rate)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+	u64 ndiv;
+	unsigned int ndiv_int, ndiv_frac, pdiv;
+
+	if (parent_rate == 0)
+		return 0;
+
+	/* PLL needs to be locked */
+	val = readl(pll->pll_base + ctrl->status.offset);
+	if ((val & (1 << ctrl->status.shift)) == 0) {
+		pll->rate = 0;
+		return 0;
+	}
+
+	/*
+	 * PLL output frequency =
+	 *
+	 * ((ndiv_int + ndiv_frac / 2^20) * (parent clock rate / pdiv)
+	 */
+	val = readl(pll->pll_base + ctrl->ndiv_int.offset);
+	ndiv_int = (val >> ctrl->ndiv_int.shift) &
+		bit_mask(ctrl->ndiv_int.width);
+	ndiv = ndiv_int << ctrl->ndiv_int.shift;
+
+	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
+		val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
+		ndiv_frac = (val >> ctrl->ndiv_frac.shift) &
+			bit_mask(ctrl->ndiv_frac.width);
+
+		if (ndiv_frac != 0)
+			ndiv = (ndiv_int << ctrl->ndiv_int.shift) | ndiv_frac;
+	}
+
+	val = readl(pll->pll_base + ctrl->pdiv.offset);
+	pdiv = (val >> ctrl->pdiv.shift) & bit_mask(ctrl->pdiv.width);
+
+	pll->rate = (ndiv * parent_rate) >> ctrl->ndiv_int.shift;
+
+	if (pdiv == 0)
+		pll->rate *= 2;
+	else
+		pll->rate /= pdiv;
+
+	return pll->rate;
+}
+
+static const struct clk_ops iproc_pll_ops = {
+	.enable = iproc_pll_enable,
+	.disable = iproc_pll_disable,
+	.recalc_rate = iproc_pll_recalc_rate,
+};
+
+void __init iproc_pll_setup(struct device_node *node,
+		const struct iproc_pll_ctrl *ctrl,
+		const struct iproc_pll_vco_freq_param *vco_param,
+		unsigned int num_vco_entries)
+{
+	int ret;
+	struct clk *clk;
+	struct iproc_pll *pll;
+	struct clk_init_data init;
+	const char *parent_name;
+	unsigned int rate;
+
+	if (WARN_ON(!ctrl))
+		return;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->pll_base = of_iomap(node, 0);
+	if (WARN_ON(!pll->pll_base))
+		goto err_pll_iomap;
+
+	pll->pwr_base = of_iomap(node, 1);
+	if (WARN_ON(!pll->pwr_base))
+		goto err_pwr_iomap;
+
+	/* some PLLs require gating control at the top ASIU level */
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		pll->asiu_base = of_iomap(node, 2);
+		if (WARN_ON(!pll->asiu_base))
+			goto err_asiu_iomap;
+	}
+
+	pll->ctrl = ctrl;
+	pll->name = node->name;
+	init.name = node->name;
+	init.ops = &iproc_pll_ops;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	pll->hw.init = &init;
+
+	/* configure the PLL to the desired VCO frequency if specified */
+	ret = of_property_read_u32(node, "clock-frequency", &rate);
+	if (!ret) {
+		unsigned long parent_rate;
+		int rate_index;
+
+		if (WARN_ON(!vco_param))
+			goto err_clk_register;
+
+		pll->num_vco_entries = num_vco_entries;
+		pll->vco_param = vco_param;
+
+		parent_rate = of_clk_get_parent_rate(node, 0);
+		if (WARN_ON(!parent_rate))
+			goto err_clk_register;
+
+		rate_index = pll_get_rate_index(pll, rate);
+		if (WARN_ON(rate_index < 0))
+			goto err_clk_register;
+
+		ret = pll_set_rate(pll, rate_index, parent_rate);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+	}
+
+	clk = clk_register(NULL, &pll->hw);
+	if (WARN_ON(IS_ERR(clk)))
+		goto err_clk_register;
+
+	ret = of_clk_add_provider(node, of_clk_src_simple_get, clk);
+	if (WARN_ON(ret))
+		goto err_clk_add;
+
+	return;
+
+err_clk_add:
+	clk_unregister(clk);
+err_clk_register:
+	if (pll->asiu_base)
+		iounmap(pll->asiu_base);
+err_asiu_iomap:
+	iounmap(pll->pwr_base);
+err_pwr_iomap:
+	iounmap(pll->pll_base);
+err_pll_iomap:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc.h b/drivers/clk/bcm/clk-iproc.h
new file mode 100644
index 0000000..cd01c1b
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc.h
@@ -0,0 +1,157 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _CLK_IPROC_H
+#define _CLK_IPROC_H
+
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/of.h>
+#include <linux/clk-provider.h>
+
+#define IPROC_CLK_NAME_LEN 25
+#define IPROC_CLK_INVALID_OFFSET 0xffffffff
+#define bit_mask(width) ((1 << (width)) - 1)
+
+/* clock should not be disabled at runtime */
+#define IPROC_CLK_AON BIT(0)
+
+/* PLL requires gating through ASIU */
+#define IPROC_CLK_PLL_ASIU BIT(1)
+
+/* PLL has fractional part of the NDIV */
+#define IPROC_CLK_PLL_HAS_NDIV_FRAC BIT(2)
+
+/*
+ * Parameters for VCO frequency configuration
+ *
+ * VCO frequency =
+ * ((ndiv_int + ndiv_frac / 2^20) * (ref freqeuncy  / pdiv)
+ */
+struct iproc_pll_vco_freq_param {
+	unsigned long rate;
+	unsigned int ndiv_int;
+	unsigned int ndiv_frac;
+	unsigned int pdiv;
+};
+
+struct iproc_clk_reg_op {
+	unsigned int offset;
+	unsigned int shift;
+	unsigned int width;
+};
+
+/*
+ * Clock gating control at the top ASIU level
+ */
+struct iproc_asiu_gate {
+	unsigned int offset;
+	unsigned int en_shift;
+};
+
+/*
+ * Control of powering on/off of a PLL
+ *
+ * Before powering off a PLL, input isolation (ISO) needs to be enabled
+ */
+struct iproc_pll_aon_pwr_ctrl {
+	unsigned int offset;
+	unsigned int pwr_width;
+	unsigned int pwr_shift;
+	unsigned int iso_shift;
+};
+
+/*
+ * Control of the PLL reset, with Ki, Kp, and Ka parameters
+ */
+struct iproc_pll_reset_ctrl {
+	unsigned int offset;
+	unsigned int reset_shift;
+	unsigned int p_reset_shift;
+	unsigned int ki_shift;
+	unsigned int ki_width;
+	unsigned int kp_shift;
+	unsigned int kp_width;
+	unsigned int ka_shift;
+	unsigned int ka_width;
+};
+
+struct iproc_pll_vco_ctrl {
+	unsigned int u_offset;
+	unsigned int l_offset;
+};
+
+/*
+ * Main PLL control parameters
+ */
+struct iproc_pll_ctrl {
+	unsigned long flags;
+	struct iproc_pll_aon_pwr_ctrl aon;
+	struct iproc_asiu_gate asiu;
+	struct iproc_pll_reset_ctrl reset;
+	struct iproc_clk_reg_op ndiv_int;
+	struct iproc_clk_reg_op ndiv_frac;
+	struct iproc_clk_reg_op pdiv;
+	struct iproc_pll_vco_ctrl vco_ctrl;
+	struct iproc_clk_reg_op status;
+};
+
+/*
+ * Controls enabling/disabling a PLL derived clock
+ */
+struct iproc_clk_enable_ctrl {
+	unsigned int offset;
+	unsigned int enable_shift;
+	unsigned int hold_shift;
+	unsigned int bypass_shift;
+};
+
+/*
+ * Main clock control parameters for clocks derived from the PLLs
+ */
+struct iproc_clk_ctrl {
+	unsigned int channel;
+	unsigned long flags;
+	struct iproc_clk_enable_ctrl enable;
+	struct iproc_clk_reg_op mdiv;
+};
+
+/*
+ * Divisor of the ASIU clocks
+ */
+struct iproc_asiu_div {
+	unsigned int offset;
+	unsigned int en_shift;
+	unsigned int high_shift;
+	unsigned int high_width;
+	unsigned int low_shift;
+	unsigned int low_width;
+};
+
+extern void iproc_armpll_setup(struct device_node *node);
+extern void iproc_pll_setup(struct device_node *node,
+			    const struct iproc_pll_ctrl *ctrl,
+			    const struct iproc_pll_vco_freq_param *vco_param,
+			    unsigned int num_freqs);
+extern void iproc_clk_setup(struct device_node *node,
+			    const struct iproc_clk_ctrl *ctrl,
+			    unsigned int num_clks);
+extern void iproc_asiu_setup(struct device_node *node,
+			     const struct iproc_asiu_div *div,
+			     const struct iproc_asiu_gate *gate,
+			     unsigned int num_clks);
+
+#endif /* _CLK_IPROC_H */
-- 
1.7.9.5

[PATCH v5 3/6] clk: iproc: add initial common clock support

[Ray Jui]

This adds basic and generic support for various iProc PLLs and clocks
including the ARMPLL, GENPLL, LCPLL, MIPIPLL, and ASIU clocks.

SoCs under the iProc architecture can define their specific register
offsets and clock parameters for their PLL and clock controllers. These
parameters can be passed as arugments into the generic iProc PLL and
clock setup functions

Derived from code originally provided by Jonathan Richardson
<jonathar@broadcom.com>

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/clk/bcm/Kconfig            |    9 +
 drivers/clk/bcm/Makefile           |    1 +
 drivers/clk/bcm/clk-iproc-armpll.c |  282 ++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc-asiu.c   |  275 +++++++++++++++++++++
 drivers/clk/bcm/clk-iproc-clk.c    |  238 +++++++++++++++++++
 drivers/clk/bcm/clk-iproc-pll.c    |  461 ++++++++++++++++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc.h        |  157 ++++++++++++
 7 files changed, 1423 insertions(+)
 create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
 create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
 create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
 create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
 create mode 100644 drivers/clk/bcm/clk-iproc.h

diff --git a/drivers/clk/bcm/Kconfig b/drivers/clk/bcm/Kconfig
index 75506e5..66b5b7f 100644
--- a/drivers/clk/bcm/Kconfig
+++ b/drivers/clk/bcm/Kconfig
@@ -7,3 +7,12 @@ config CLK_BCM_KONA
 	  Enable common clock framework support for Broadcom SoCs
 	  using "Kona" style clock control units, including those
 	  in the BCM281xx and BCM21664 families.
+
+config COMMON_CLK_IPROC
+	bool "Broadcom iProc clock support"
+	depends on ARCH_BCM_IPROC
+	depends on COMMON_CLK
+	default y
+	help
+	  Enable common clock framework support for Broadcom SoCs
+	  based on the "iProc" architecture
diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
index 6297d05..6926636 100644
--- a/drivers/clk/bcm/Makefile
+++ b/drivers/clk/bcm/Makefile
@@ -2,3 +2,4 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
+obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
diff --git a/drivers/clk/bcm/clk-iproc-armpll.c b/drivers/clk/bcm/clk-iproc-armpll.c
new file mode 100644
index 0000000..965cd4e
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-armpll.c
@@ -0,0 +1,282 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+
+#define IPROC_CLK_MAX_FREQ_POLICY                    0x3
+#define IPROC_CLK_POLICY_FREQ_OFFSET                 0x008
+#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT      8
+#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK       0x7
+
+#define IPROC_CLK_PLLARMA_OFFSET                     0xc00
+#define IPROC_CLK_PLLARMA_LOCK_SHIFT                 28
+#define IPROC_CLK_PLLARMA_PDIV_SHIFT                 24
+#define IPROC_CLK_PLLARMA_PDIV_MASK                  0xf
+#define IPROC_CLK_PLLARMA_NDIV_INT_SHIFT             8
+#define IPROC_CLK_PLLARMA_NDIV_INT_MASK              0x3ff
+
+#define IPROC_CLK_PLLARMB_OFFSET                     0xc04
+#define IPROC_CLK_PLLARMB_NDIV_FRAC_MASK             0xfffff
+
+#define IPROC_CLK_PLLARMC_OFFSET                     0xc08
+#define IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT            8
+#define IPROC_CLK_PLLARMC_MDIV_MASK                  0xff
+
+#define IPROC_CLK_PLLARMCTL5_OFFSET                  0xc20
+#define IPROC_CLK_PLLARMCTL5_H_MDIV_MASK             0xff
+
+#define IPROC_CLK_PLLARM_OFFSET_OFFSET               0xc24
+#define IPROC_CLK_PLLARM_SW_CTL_SHIFT                29
+#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT       20
+#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK        0xff
+#define IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK       0xfffff
+
+#define IPROC_CLK_ARM_DIV_OFFSET                     0xe00
+#define IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT  4
+#define IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK        0xf
+
+#define IPROC_CLK_POLICY_DBG_OFFSET                  0xec0
+#define IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT          12
+#define IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK           0x7
+
+enum iproc_arm_pll_fid {
+	ARM_PLL_FID_CRYSTAL_CLK   = 0,
+	ARM_PLL_FID_SYS_CLK       = 2,
+	ARM_PLL_FID_CH0_SLOW_CLK  = 6,
+	ARM_PLL_FID_CH1_FAST_CLK  = 7
+};
+
+struct iproc_arm_pll {
+	struct clk_hw hw;
+	void __iomem *base;
+	unsigned long rate;
+};
+
+#define to_iproc_arm_pll(hw) container_of(hw, struct iproc_arm_pll, hw)
+
+static unsigned int __get_fid(struct iproc_arm_pll *pll)
+{
+	u32 val;
+	unsigned int policy, fid, active_fid;
+
+	val = readl(pll->base + IPROC_CLK_ARM_DIV_OFFSET);
+	if (val & (1 << IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT))
+		policy = val & IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK;
+	else
+		policy = 0;
+
+	/* something is seriously wrong */
+	BUG_ON(policy > IPROC_CLK_MAX_FREQ_POLICY);
+
+	val = readl(pll->base + IPROC_CLK_POLICY_FREQ_OFFSET);
+	fid = (val >> (IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT * policy)) &
+		IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK;
+
+	val = readl(pll->base + IPROC_CLK_POLICY_DBG_OFFSET);
+	active_fid = IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK &
+		(val >> IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT);
+	if (fid != active_fid) {
+		pr_debug("%s: fid override %u->%u\n", __func__,	fid,
+				active_fid);
+		fid = active_fid;
+	}
+
+	pr_debug("%s: active fid: %u\n", __func__, fid);
+
+	return fid;
+}
+
+/*
+ * Determine the mdiv (post divider) based on the frequency ID being used.
+ * There are 4 sources that can be used to derive the output clock rate:
+ *    - 25 MHz Crystal
+ *    - System clock
+ *    - PLL channel 0 (slow clock)
+ *    - PLL channel 1 (fast clock)
+ */
+static int __get_mdiv(struct iproc_arm_pll *pll)
+{
+	unsigned int fid;
+	int mdiv;
+	u32 val;
+
+	fid = __get_fid(pll);
+
+	switch (fid) {
+	case ARM_PLL_FID_CRYSTAL_CLK:
+	case ARM_PLL_FID_SYS_CLK:
+		mdiv = 1;
+		break;
+
+	case ARM_PLL_FID_CH0_SLOW_CLK:
+		val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
+		mdiv = val & IPROC_CLK_PLLARMC_MDIV_MASK;
+		if (mdiv == 0)
+			mdiv = 256;
+		break;
+
+	case ARM_PLL_FID_CH1_FAST_CLK:
+		val = readl(pll->base +	IPROC_CLK_PLLARMCTL5_OFFSET);
+		mdiv = val & IPROC_CLK_PLLARMCTL5_H_MDIV_MASK;
+		if (mdiv == 0)
+			mdiv = 256;
+		break;
+
+	default:
+		mdiv = -EFAULT;
+	}
+
+	return mdiv;
+}
+
+static unsigned int __get_ndiv(struct iproc_arm_pll *pll)
+{
+	u32 val;
+	unsigned int ndiv_int, ndiv_frac, ndiv;
+
+	val = readl(pll->base + IPROC_CLK_PLLARM_OFFSET_OFFSET);
+	if (val & (1 << IPROC_CLK_PLLARM_SW_CTL_SHIFT)) {
+		/*
+		 * offset mode is active. Read the ndiv from the PLLARM OFFSET
+		 * register
+		 */
+		ndiv_int = (val >> IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT) &
+			IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK;
+		if (ndiv_int == 0)
+			ndiv_int = 256;
+
+		ndiv_frac = val & IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK;
+	} else {
+		/* offset mode not active */
+		val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
+		ndiv_int = (val >> IPROC_CLK_PLLARMA_NDIV_INT_SHIFT) &
+			IPROC_CLK_PLLARMA_NDIV_INT_MASK;
+		if (ndiv_int == 0)
+			ndiv_int = 1024;
+
+		val = readl(pll->base + IPROC_CLK_PLLARMB_OFFSET);
+		ndiv_frac = val & IPROC_CLK_PLLARMB_NDIV_FRAC_MASK;
+	}
+
+	ndiv = (ndiv_int << 20) | ndiv_frac;
+
+	return ndiv;
+}
+
+/*
+ * The output frequency of the ARM PLL is calculated based on the ARM PLL
+ * divider values:
+ *   pdiv = ARM PLL pre-divider
+ *   ndiv = ARM PLL multiplier
+ *   mdiv = ARM PLL post divider
+ *
+ * The frequency is calculated by:
+ *   ((ndiv * parent clock rate) / pdiv) / mdiv
+ */
+static unsigned long iproc_arm_pll_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_arm_pll *pll = to_iproc_arm_pll(hw);
+	u32 val;
+	int mdiv;
+	u64 ndiv;
+	unsigned int pdiv;
+
+	/* in bypass mode, use parent rate */
+	val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
+	if (val & (1 << IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT)) {
+		pll->rate = parent_rate;
+		return pll->rate;
+	}
+
+	/* PLL needs to be locked */
+	val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
+	if (!(val & (1 << IPROC_CLK_PLLARMA_LOCK_SHIFT))) {
+		pll->rate = 0;
+		return 0;
+	}
+
+	pdiv = (val >> IPROC_CLK_PLLARMA_PDIV_SHIFT) &
+		IPROC_CLK_PLLARMA_PDIV_MASK;
+	if (pdiv == 0)
+		pdiv = 16;
+
+	ndiv = __get_ndiv(pll);
+	mdiv = __get_mdiv(pll);
+	if (mdiv <= 0) {
+		pll->rate = 0;
+		return 0;
+	}
+	pll->rate = (ndiv * parent_rate) >> 20;
+	pll->rate = (pll->rate / pdiv) / mdiv;
+
+	pr_debug("%s: ARM PLL rate: %lu. parent rate: %lu\n", __func__,
+			pll->rate, parent_rate);
+	pr_debug("%s: ndiv_int: %u, pdiv: %u, mdiv: %d\n", __func__,
+			(unsigned int)(ndiv >> 20), pdiv, mdiv);
+
+	return pll->rate;
+}
+
+static const struct clk_ops iproc_arm_pll_ops = {
+	.recalc_rate = iproc_arm_pll_recalc_rate,
+};
+
+void __init iproc_armpll_setup(struct device_node *node)
+{
+	int ret;
+	struct clk *clk;
+	struct iproc_arm_pll *pll;
+	struct clk_init_data init;
+	const char *parent_name;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->base = of_iomap(node, 0);
+	if (WARN_ON(!pll->base))
+		goto err_free_pll;
+
+	init.name = node->name;
+	init.ops = &iproc_arm_pll_ops;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	pll->hw.init = &init;
+
+	clk = clk_register(NULL, &pll->hw);
+	if (WARN_ON(IS_ERR(clk)))
+		goto err_iounmap;
+
+	ret = of_clk_add_provider(node, of_clk_src_simple_get, clk);
+	if (WARN_ON(ret))
+		goto err_clk_unregister;
+
+	return;
+
+err_clk_unregister:
+	clk_unregister(clk);
+err_iounmap:
+	iounmap(pll->base);
+err_free_pll:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc-asiu.c b/drivers/clk/bcm/clk-iproc-asiu.c
new file mode 100644
index 0000000..ab86b8c
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-asiu.c
@@ -0,0 +1,275 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+struct iproc_asiu;
+
+struct iproc_asiu_clk {
+	struct clk_hw hw;
+	const char *name;
+	struct iproc_asiu *asiu;
+	unsigned long rate;
+	struct iproc_asiu_div div;
+	struct iproc_asiu_gate gate;
+};
+
+struct iproc_asiu {
+	void __iomem *div_base;
+	void __iomem *gate_base;
+
+	struct clk_onecell_data clk_data;
+	struct iproc_asiu_clk *clks;
+};
+
+#define to_asiu_clk(hw) container_of(hw, struct iproc_asiu_clk, hw)
+
+static int iproc_asiu_clk_enable(struct clk_hw *hw)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+
+	/* some clocks at the ASIU level are always enabled */
+	if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
+		return 0;
+
+	val = readl(asiu->gate_base + clk->gate.offset);
+	val |= (1 << clk->gate.en_shift);
+	writel(val, asiu->gate_base + clk->gate.offset);
+
+	return 0;
+}
+
+static void iproc_asiu_clk_disable(struct clk_hw *hw)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+
+	/* some clocks at the ASIU level are always enabled */
+	if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
+		return;
+
+	val = readl(asiu->gate_base + clk->gate.offset);
+	val &= ~(1 << clk->gate.en_shift);
+	writel(val, asiu->gate_base + clk->gate.offset);
+}
+
+static unsigned long iproc_asiu_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+	unsigned int div_h, div_l;
+
+	if (parent_rate == 0) {
+		clk->rate = 0;
+		return 0;
+	}
+
+	/* if clock divisor is not enabled, simply return parent rate */
+	val = readl(asiu->div_base + clk->div.offset);
+	if ((val & (1 << clk->div.en_shift)) == 0) {
+		clk->rate = parent_rate;
+		return parent_rate;
+	}
+
+	/* clock rate = parent rate / (high_div + 1) + (low_div + 1) */
+	div_h = (val >> clk->div.high_shift) & bit_mask(clk->div.high_width);
+	div_h++;
+	div_l = (val >> clk->div.low_shift) & bit_mask(clk->div.low_width);
+	div_l++;
+
+	clk->rate = parent_rate / (div_h + div_l);
+	pr_debug("%s: rate: %lu. parent rate: %lu div_h: %u div_l: %u\n",
+		__func__, clk->rate, parent_rate, div_h, div_l);
+
+	return clk->rate;
+}
+
+static long iproc_asiu_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	unsigned int div;
+
+	if (rate == 0 || *parent_rate == 0)
+		return -EINVAL;
+
+	if (rate == *parent_rate)
+		return *parent_rate;
+
+	div = DIV_ROUND_UP(*parent_rate, rate);
+	if (div < 2)
+		return *parent_rate;
+
+	return *parent_rate / div;
+}
+
+static int iproc_asiu_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	unsigned int div, div_h, div_l;
+	u32 val;
+
+	if (rate == 0 || parent_rate == 0)
+		return -EINVAL;
+
+	/* simply disable the divisor if one wants the same rate as parent */
+	if (rate == parent_rate) {
+		val = readl(asiu->div_base + clk->div.offset);
+		val &= ~(1 << clk->div.en_shift);
+		writel(val, asiu->div_base + clk->div.offset);
+		return 0;
+	}
+
+	div = DIV_ROUND_UP(parent_rate, rate);
+	if (div < 2)
+		return -EINVAL;
+
+	div_h = div_l = div >> 1;
+	div_h--;
+	div_l--;
+
+	val = readl(asiu->div_base + clk->div.offset);
+	val |= 1 << clk->div.en_shift;
+	if (div_h) {
+		val &= ~(bit_mask(clk->div.high_width)
+				<< clk->div.high_shift);
+		val |= div_h << clk->div.high_shift;
+	} else {
+		val &= ~(bit_mask(clk->div.high_width)
+				<< clk->div.high_shift);
+	}
+	if (div_l) {
+		val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
+		val |= div_l << clk->div.low_shift;
+	} else {
+		val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
+	}
+	writel(val, asiu->div_base + clk->div.offset);
+
+	return 0;
+}
+
+static const struct clk_ops iproc_asiu_ops = {
+	.enable = iproc_asiu_clk_enable,
+	.disable = iproc_asiu_clk_disable,
+	.recalc_rate = iproc_asiu_clk_recalc_rate,
+	.round_rate = iproc_asiu_clk_round_rate,
+	.set_rate = iproc_asiu_clk_set_rate,
+};
+
+void __init iproc_asiu_setup(struct device_node *node,
+		const struct iproc_asiu_div *div,
+		const struct iproc_asiu_gate *gate, unsigned int num_clks)
+{
+	int i, ret;
+	struct iproc_asiu *asiu;
+
+	if (WARN_ON(!gate || !div))
+		return;
+
+	asiu = kzalloc(sizeof(*asiu), GFP_KERNEL);
+	if (WARN_ON(!asiu))
+		return;
+
+	asiu->clk_data.clk_num = num_clks;
+	asiu->clk_data.clks = kcalloc(num_clks, sizeof(*asiu->clk_data.clks),
+			GFP_KERNEL);
+	if (WARN_ON(!asiu->clk_data.clks))
+		goto err_clks;
+
+	asiu->clks = kcalloc(num_clks, sizeof(*asiu->clks), GFP_KERNEL);
+	if (WARN_ON(!asiu->clks))
+		goto err_asiu_clks;
+
+	asiu->div_base = of_iomap(node, 0);
+	if (WARN_ON(!asiu->div_base))
+		goto err_iomap_div;
+
+	asiu->gate_base = of_iomap(node, 1);
+	if (WARN_ON(!asiu->gate_base))
+		goto err_iomap_gate;
+
+	for (i = 0; i < num_clks; i++) {
+		struct clk_init_data init;
+		struct clk *clk;
+		const char *parent_name;
+		struct iproc_asiu_clk *asiu_clk;
+		const char *clk_name;
+
+		clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
+		if (WARN_ON(!clk_name))
+			goto err_clk_register;
+
+		ret = of_property_read_string_index(node, "clock-output-names",
+				i, &clk_name);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+
+		asiu_clk = &asiu->clks[i];
+		asiu_clk->name = clk_name;
+		asiu_clk->asiu = asiu;
+		asiu_clk->div = div[i];
+		asiu_clk->gate = gate[i];
+		init.name = clk_name;
+		init.ops = &iproc_asiu_ops;
+		init.flags = 0;
+		parent_name = of_clk_get_parent_name(node, 0);
+		init.parent_names = (parent_name ? &parent_name : NULL);
+		init.num_parents = (parent_name ? 1 : 0);
+		asiu_clk->hw.init = &init;
+
+		clk = clk_register(NULL, &asiu_clk->hw);
+		if (WARN_ON(IS_ERR(clk)))
+			goto err_clk_register;
+		asiu->clk_data.clks[i] = clk;
+	}
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get,
+			&asiu->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_register;
+
+	return;
+
+err_clk_register:
+	for (i = 0; i < num_clks; i++)
+		kfree(asiu->clks[i].name);
+	iounmap(asiu->gate_base);
+
+err_iomap_gate:
+	iounmap(asiu->div_base);
+
+err_iomap_div:
+	kfree(asiu->clks);
+
+err_asiu_clks:
+	kfree(asiu->clk_data.clks);
+
+err_clks:
+	kfree(asiu);
+}
diff --git a/drivers/clk/bcm/clk-iproc-clk.c b/drivers/clk/bcm/clk-iproc-clk.c
new file mode 100644
index 0000000..be3c42c
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-clk.c
@@ -0,0 +1,238 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+struct iproc_pll;
+
+struct iproc_clk {
+	struct clk_hw hw;
+	const char *name;
+	struct iproc_pll *pll;
+	unsigned long rate;
+	const struct iproc_clk_ctrl *ctrl;
+};
+
+struct iproc_pll {
+	void __iomem *base;
+	struct clk_onecell_data clk_data;
+	struct iproc_clk *clks;
+};
+
+#define to_iproc_clk(hw) container_of(hw, struct iproc_clk, hw)
+
+static int iproc_clk_enable(struct clk_hw *hw)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+
+	/* channel enable is active low */
+	val = readl(pll->base + ctrl->enable.offset);
+	val &= ~(1 << ctrl->enable.enable_shift);
+	writel(val, pll->base + ctrl->enable.offset);
+
+	/* also make sure channel is not held */
+	val = readl(pll->base + ctrl->enable.offset);
+	val &= ~(1 << ctrl->enable.hold_shift);
+	writel(val, pll->base + ctrl->enable.offset);
+
+	return 0;
+}
+
+static void iproc_clk_disable(struct clk_hw *hw)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+
+	if (ctrl->flags & IPROC_CLK_AON)
+		return;
+
+	val = readl(pll->base + ctrl->enable.offset);
+	val |= 1 << ctrl->enable.enable_shift;
+	writel(val, pll->base + ctrl->enable.offset);
+}
+
+static unsigned long iproc_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+	unsigned int mdiv;
+
+	if (parent_rate == 0)
+		return 0;
+
+	val = readl(pll->base + ctrl->mdiv.offset);
+	mdiv = (val >> ctrl->mdiv.shift) & bit_mask(ctrl->mdiv.width);
+	if (mdiv == 0)
+		mdiv = 256;
+
+	clk->rate = parent_rate / mdiv;
+
+	return clk->rate;
+}
+
+static long iproc_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	unsigned int div;
+
+	if (rate == 0 || *parent_rate == 0)
+		return -EINVAL;
+
+	if (rate == *parent_rate)
+		return *parent_rate;
+
+	div = DIV_ROUND_UP(*parent_rate, rate);
+	if (div < 2)
+		return *parent_rate;
+
+	if (div > 256)
+		div = 256;
+
+	return *parent_rate / div;
+}
+
+static int iproc_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+	unsigned int div;
+
+	if (rate == 0 || parent_rate == 0)
+		return -EINVAL;
+
+	div = DIV_ROUND_UP(parent_rate, rate);
+	if (div > 256)
+		return -EINVAL;
+
+	val = readl(pll->base + ctrl->mdiv.offset);
+	if (div == 256) {
+		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
+	} else {
+		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
+		val |= div << ctrl->mdiv.shift;
+	}
+	writel(val, pll->base + ctrl->mdiv.offset);
+	clk->rate = parent_rate / div;
+
+	return 0;
+}
+
+static const struct clk_ops iproc_clk_ops = {
+	.enable = iproc_clk_enable,
+	.disable = iproc_clk_disable,
+	.recalc_rate = iproc_clk_recalc_rate,
+	.round_rate = iproc_clk_round_rate,
+	.set_rate = iproc_clk_set_rate,
+};
+
+void __init iproc_clk_setup(struct device_node *node,
+		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks)
+{
+	int i, ret;
+	struct iproc_pll *pll;
+
+	if (WARN_ON(!ctrl))
+		return;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->clk_data.clk_num = num_clks;
+	pll->clk_data.clks = kcalloc(num_clks, sizeof(*pll->clk_data.clks),
+			GFP_KERNEL);
+	if (WARN_ON(!pll->clk_data.clks))
+		goto err_clks;
+
+	pll->clks = kcalloc(num_clks, sizeof(*pll->clks), GFP_KERNEL);
+	if (WARN_ON(!pll->clks))
+		goto err_pll_clks;
+
+	pll->base = of_iomap(node, 0);
+	if (WARN_ON(!pll->base))
+		goto err_iomap;
+
+	for (i = 0; i < num_clks; i++) {
+		struct clk_init_data init;
+		struct clk *clk;
+		const char *parent_name;
+		struct iproc_clk *iclk;
+		const char *clk_name;
+
+		clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
+		if (WARN_ON(!clk_name))
+			goto err_clk_register;
+
+		ret = of_property_read_string_index(node, "clock-output-names",
+				i, &clk_name);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+
+		iclk = &pll->clks[i];
+		iclk->name = clk_name;
+		iclk->pll = pll;
+		iclk->ctrl = &ctrl[i];
+		init.name = clk_name;
+		init.ops = &iproc_clk_ops;
+		init.flags = 0;
+		parent_name = of_clk_get_parent_name(node, 0);
+		init.parent_names = (parent_name ? &parent_name : NULL);
+		init.num_parents = (parent_name ? 1 : 0);
+		iclk->hw.init = &init;
+
+		clk = clk_register(NULL, &iclk->hw);
+		if (WARN_ON(IS_ERR(clk)))
+			goto err_clk_register;
+		pll->clk_data.clks[i] = clk;
+	}
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_register;
+
+	return;
+
+err_clk_register:
+	for (i = 0; i < num_clks; i++)
+		kfree(pll->clks[i].name);
+	iounmap(pll->base);
+
+err_iomap:
+	kfree(pll->clks);
+
+err_pll_clks:
+	kfree(pll->clk_data.clks);
+
+err_clks:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc-pll.c b/drivers/clk/bcm/clk-iproc-pll.c
new file mode 100644
index 0000000..3b82cbd
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-pll.c
@@ -0,0 +1,461 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+#define PLL_VCO_HIGH_SHIFT 19
+#define PLL_VCO_LOW_SHIFT  30
+
+/* number of delay loops waiting for PLL to lock */
+#define LOCK_DELAY 100
+
+/* number of VCO frequency bands */
+#define NUM_FREQ_BANDS 8
+
+#define NUM_KP_BANDS 3
+enum kp_band {
+	KP_BAND_MID = 0,
+	KP_BAND_HIGH,
+	KP_BAND_HIGH_HIGH
+};
+
+static const unsigned int kp_table[NUM_KP_BANDS][NUM_FREQ_BANDS] = {
+	{ 5, 6, 6, 7, 7, 8, 9, 10 },
+	{ 4, 4, 5, 5, 6, 7, 8, 9  },
+	{ 4, 5, 5, 6, 7, 8, 9, 10 },
+};
+
+static const unsigned long ref_freq_table[NUM_FREQ_BANDS][2] = {
+	{ 10000000,  12500000  },
+	{ 12500000,  15000000  },
+	{ 15000000,  20000000  },
+	{ 20000000,  25000000  },
+	{ 25000000,  50000000  },
+	{ 50000000,  75000000  },
+	{ 75000000,  100000000 },
+	{ 100000000, 125000000 },
+};
+
+enum vco_freq_range {
+	VCO_LOW       = 700000000U,
+	VCO_MID       = 1200000000U,
+	VCO_HIGH      = 2200000000U,
+	VCO_HIGH_HIGH = 3100000000U,
+	VCO_MAX       = 4000000000U,
+};
+
+struct iproc_pll {
+	struct clk_hw hw;
+	void __iomem *pll_base;
+	void __iomem *pwr_base;
+	void __iomem *asiu_base;
+	const char *name;
+	const struct iproc_pll_ctrl *ctrl;
+	const struct iproc_pll_vco_freq_param *vco_param;
+	unsigned int num_vco_entries;
+	unsigned long rate;
+};
+
+#define to_iproc_pll(hw) container_of(hw, struct iproc_pll, hw)
+
+/*
+ * Based on the target frequency, find a match from the VCO frequency parameter
+ * table and return its index
+ */
+static int pll_get_rate_index(struct iproc_pll *pll, unsigned int target_rate)
+{
+	int i;
+
+	for (i = 0; i < pll->num_vco_entries; i++)
+		if (target_rate == pll->vco_param[i].rate)
+			break;
+
+	if (i >= pll->num_vco_entries)
+		return -EINVAL;
+
+	return i;
+}
+
+static int get_kp(unsigned long ref_freq, enum kp_band kp_index)
+{
+	int i;
+
+	if (ref_freq < ref_freq_table[0][0])
+		return -EINVAL;
+
+	for (i = 0; i < NUM_FREQ_BANDS; i++) {
+		if (ref_freq >= ref_freq_table[i][0] &&
+			ref_freq < ref_freq_table[i][1])
+			return kp_table[kp_index][i];
+	}
+	return -EINVAL;
+}
+
+static int pll_wait_for_lock(struct iproc_pll *pll)
+{
+	int i;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+
+	for (i = 0; i < LOCK_DELAY; i++) {
+		u32 val = readl(pll->pll_base + ctrl->status.offset);
+
+		if (val & (1 << ctrl->status.shift))
+			return 0;
+		udelay(10);
+	}
+
+	return -EIO;
+}
+
+static void __pll_disable(struct iproc_pll *pll)
+{
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		val = readl(pll->asiu_base + ctrl->asiu.offset);
+		val &= ~(1 << ctrl->asiu.en_shift);
+		writel(val, pll->asiu_base + ctrl->asiu.offset);
+	}
+
+	/* latch input value so core power can be shut down */
+	val = readl(pll->pwr_base + ctrl->aon.offset);
+	val |= (1 << ctrl->aon.iso_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+
+	/* power down the core */
+	val &= ~(bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+}
+
+static int __pll_enable(struct iproc_pll *pll)
+{
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+
+	/* power up the PLL and make sure it's not latched */
+	val = readl(pll->pwr_base + ctrl->aon.offset);
+	val |= bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift;
+	val &= ~(1 << ctrl->aon.iso_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+
+	/* certain PLLs also need to be ungated from the ASIU top level */
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		val = readl(pll->asiu_base + ctrl->asiu.offset);
+		val |= (1 << ctrl->asiu.en_shift);
+		writel(val, pll->asiu_base + ctrl->asiu.offset);
+	}
+
+	return 0;
+}
+
+static void __pll_put_in_reset(struct iproc_pll *pll)
+{
+	u32 val;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
+
+	val = readl(pll->pll_base + reset->offset);
+	val &= ~(1 << reset->reset_shift | 1 << reset->p_reset_shift);
+	writel(val, pll->pll_base + reset->offset);
+}
+
+static void __pll_bring_out_reset(struct iproc_pll *pll, unsigned int kp,
+		unsigned int ka, unsigned int ki)
+{
+	u32 val;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
+
+	val = readl(pll->pll_base + reset->offset);
+	val &= ~(bit_mask(reset->ki_width) << reset->ki_shift |
+		bit_mask(reset->kp_width) << reset->kp_shift |
+		bit_mask(reset->ka_width) << reset->ka_shift);
+	val |=  ki << reset->ki_shift | kp << reset->kp_shift |
+		ka << reset->ka_shift;
+	val |= 1 << reset->reset_shift | 1 << reset->p_reset_shift;
+	writel(val, pll->pll_base + reset->offset);
+}
+
+static int pll_set_rate(struct iproc_pll *pll, unsigned int rate_index,
+		unsigned long parent_rate)
+{
+	const struct iproc_pll_vco_freq_param *vco =
+				&pll->vco_param[rate_index];
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	int ka = 0, ki, kp, ret;
+	unsigned long rate = vco->rate;
+	u32 val;
+	enum kp_band kp_index;
+	unsigned long ref_freq;
+
+	/*
+	 * reference frequency = parent frequency / PDIV
+	 * If PDIV = 0, then it becomes a multiplier (x2)
+	 */
+	if (vco->pdiv == 0)
+		ref_freq = parent_rate * 2;
+	else
+		ref_freq = parent_rate / vco->pdiv;
+
+	/* determine Ki and Kp index based on target VCO frequency */
+	if (rate >= VCO_LOW && rate < VCO_HIGH) {
+		ki = 4;
+		kp_index = KP_BAND_MID;
+	} else if (rate >= VCO_HIGH && rate && rate < VCO_HIGH_HIGH) {
+		ki = 3;
+		kp_index = KP_BAND_HIGH;
+	} else if (rate >= VCO_HIGH_HIGH && rate < VCO_MAX) {
+		ki = 3;
+		kp_index = KP_BAND_HIGH_HIGH;
+	} else {
+		pr_err("%s: pll: %s has invalid rate: %lu\n", __func__,
+				pll->name, rate);
+		return -EINVAL;
+	}
+
+	kp = get_kp(ref_freq, kp_index);
+	if (kp < 0) {
+		pr_err("%s: pll: %s has invalid kp\n", __func__, pll->name);
+		return kp;
+	}
+
+	ret = __pll_enable(pll);
+	if (ret) {
+		pr_err("%s: pll: %s fails to enable\n", __func__, pll->name);
+		return ret;
+	}
+
+	/* put PLL in reset */
+	__pll_put_in_reset(pll);
+
+	writel(0, pll->pll_base + ctrl->vco_ctrl.u_offset);
+	val = readl(pll->pll_base + ctrl->vco_ctrl.l_offset);
+
+	if (rate >= VCO_LOW && rate < VCO_MID)
+		val |= (1 << PLL_VCO_LOW_SHIFT);
+
+	if (rate < VCO_HIGH)
+		val &= ~(1 << PLL_VCO_HIGH_SHIFT);
+	else
+		val |= (1 << PLL_VCO_HIGH_SHIFT);
+
+	writel(val, pll->pll_base + ctrl->vco_ctrl.l_offset);
+
+	/* program integer part of NDIV */
+	val = readl(pll->pll_base + ctrl->ndiv_int.offset);
+	val &= ~(bit_mask(ctrl->ndiv_int.width) << ctrl->ndiv_int.shift);
+	val |= vco->ndiv_int << ctrl->ndiv_int.shift;
+	writel(val, pll->pll_base + ctrl->ndiv_int.offset);
+
+	/* program fractional part of NDIV */
+	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
+		val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
+		val &= ~(bit_mask(ctrl->ndiv_frac.width) <<
+				ctrl->ndiv_frac.shift);
+		val |= vco->ndiv_frac << ctrl->ndiv_frac.shift;
+		writel(val, pll->pll_base + ctrl->ndiv_frac.offset);
+	}
+
+	/* program PDIV */
+	val = readl(pll->pll_base + ctrl->pdiv.offset);
+	val &= ~(bit_mask(ctrl->pdiv.width) << ctrl->pdiv.shift);
+	val |= vco->pdiv << ctrl->pdiv.shift;
+	writel(val, pll->pll_base + ctrl->pdiv.offset);
+
+	__pll_bring_out_reset(pll, kp, ka, ki);
+
+	ret = pll_wait_for_lock(pll);
+	if (ret < 0) {
+		pr_err("%s: pll: %s failed to lock\n", __func__, pll->name);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int iproc_pll_enable(struct clk_hw *hw)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+
+	return __pll_enable(pll);
+}
+
+static void iproc_pll_disable(struct clk_hw *hw)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+
+	if (ctrl->flags & IPROC_CLK_AON)
+		return;
+
+	__pll_disable(pll);
+}
+
+static unsigned long iproc_pll_recalc_rate(struct clk_hw *hw,
+	unsigned long parent_rate)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+	u64 ndiv;
+	unsigned int ndiv_int, ndiv_frac, pdiv;
+
+	if (parent_rate == 0)
+		return 0;
+
+	/* PLL needs to be locked */
+	val = readl(pll->pll_base + ctrl->status.offset);
+	if ((val & (1 << ctrl->status.shift)) == 0) {
+		pll->rate = 0;
+		return 0;
+	}
+
+	/*
+	 * PLL output frequency =
+	 *
+	 * ((ndiv_int + ndiv_frac / 2^20) * (parent clock rate / pdiv)
+	 */
+	val = readl(pll->pll_base + ctrl->ndiv_int.offset);
+	ndiv_int = (val >> ctrl->ndiv_int.shift) &
+		bit_mask(ctrl->ndiv_int.width);
+	ndiv = ndiv_int << ctrl->ndiv_int.shift;
+
+	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
+		val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
+		ndiv_frac = (val >> ctrl->ndiv_frac.shift) &
+			bit_mask(ctrl->ndiv_frac.width);
+
+		if (ndiv_frac != 0)
+			ndiv = (ndiv_int << ctrl->ndiv_int.shift) | ndiv_frac;
+	}
+
+	val = readl(pll->pll_base + ctrl->pdiv.offset);
+	pdiv = (val >> ctrl->pdiv.shift) & bit_mask(ctrl->pdiv.width);
+
+	pll->rate = (ndiv * parent_rate) >> ctrl->ndiv_int.shift;
+
+	if (pdiv == 0)
+		pll->rate *= 2;
+	else
+		pll->rate /= pdiv;
+
+	return pll->rate;
+}
+
+static const struct clk_ops iproc_pll_ops = {
+	.enable = iproc_pll_enable,
+	.disable = iproc_pll_disable,
+	.recalc_rate = iproc_pll_recalc_rate,
+};
+
+void __init iproc_pll_setup(struct device_node *node,
+		const struct iproc_pll_ctrl *ctrl,
+		const struct iproc_pll_vco_freq_param *vco_param,
+		unsigned int num_vco_entries)
+{
+	int ret;
+	struct clk *clk;
+	struct iproc_pll *pll;
+	struct clk_init_data init;
+	const char *parent_name;
+	unsigned int rate;
+
+	if (WARN_ON(!ctrl))
+		return;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->pll_base = of_iomap(node, 0);
+	if (WARN_ON(!pll->pll_base))
+		goto err_pll_iomap;
+
+	pll->pwr_base = of_iomap(node, 1);
+	if (WARN_ON(!pll->pwr_base))
+		goto err_pwr_iomap;
+
+	/* some PLLs require gating control at the top ASIU level */
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		pll->asiu_base = of_iomap(node, 2);
+		if (WARN_ON(!pll->asiu_base))
+			goto err_asiu_iomap;
+	}
+
+	pll->ctrl = ctrl;
+	pll->name = node->name;
+	init.name = node->name;
+	init.ops = &iproc_pll_ops;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	pll->hw.init = &init;
+
+	/* configure the PLL to the desired VCO frequency if specified */
+	ret = of_property_read_u32(node, "clock-frequency", &rate);
+	if (!ret) {
+		unsigned long parent_rate;
+		int rate_index;
+
+		if (WARN_ON(!vco_param))
+			goto err_clk_register;
+
+		pll->num_vco_entries = num_vco_entries;
+		pll->vco_param = vco_param;
+
+		parent_rate = of_clk_get_parent_rate(node, 0);
+		if (WARN_ON(!parent_rate))
+			goto err_clk_register;
+
+		rate_index = pll_get_rate_index(pll, rate);
+		if (WARN_ON(rate_index < 0))
+			goto err_clk_register;
+
+		ret = pll_set_rate(pll, rate_index, parent_rate);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+	}
+
+	clk = clk_register(NULL, &pll->hw);
+	if (WARN_ON(IS_ERR(clk)))
+		goto err_clk_register;
+
+	ret = of_clk_add_provider(node, of_clk_src_simple_get, clk);
+	if (WARN_ON(ret))
+		goto err_clk_add;
+
+	return;
+
+err_clk_add:
+	clk_unregister(clk);
+err_clk_register:
+	if (pll->asiu_base)
+		iounmap(pll->asiu_base);
+err_asiu_iomap:
+	iounmap(pll->pwr_base);
+err_pwr_iomap:
+	iounmap(pll->pll_base);
+err_pll_iomap:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc.h b/drivers/clk/bcm/clk-iproc.h
new file mode 100644
index 0000000..cd01c1b
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc.h
@@ -0,0 +1,157 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _CLK_IPROC_H
+#define _CLK_IPROC_H
+
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/of.h>
+#include <linux/clk-provider.h>
+
+#define IPROC_CLK_NAME_LEN 25
+#define IPROC_CLK_INVALID_OFFSET 0xffffffff
+#define bit_mask(width) ((1 << (width)) - 1)
+
+/* clock should not be disabled at runtime */
+#define IPROC_CLK_AON BIT(0)
+
+/* PLL requires gating through ASIU */
+#define IPROC_CLK_PLL_ASIU BIT(1)
+
+/* PLL has fractional part of the NDIV */
+#define IPROC_CLK_PLL_HAS_NDIV_FRAC BIT(2)
+
+/*
+ * Parameters for VCO frequency configuration
+ *
+ * VCO frequency =
+ * ((ndiv_int + ndiv_frac / 2^20) * (ref freqeuncy  / pdiv)
+ */
+struct iproc_pll_vco_freq_param {
+	unsigned long rate;
+	unsigned int ndiv_int;
+	unsigned int ndiv_frac;
+	unsigned int pdiv;
+};
+
+struct iproc_clk_reg_op {
+	unsigned int offset;
+	unsigned int shift;
+	unsigned int width;
+};
+
+/*
+ * Clock gating control at the top ASIU level
+ */
+struct iproc_asiu_gate {
+	unsigned int offset;
+	unsigned int en_shift;
+};
+
+/*
+ * Control of powering on/off of a PLL
+ *
+ * Before powering off a PLL, input isolation (ISO) needs to be enabled
+ */
+struct iproc_pll_aon_pwr_ctrl {
+	unsigned int offset;
+	unsigned int pwr_width;
+	unsigned int pwr_shift;
+	unsigned int iso_shift;
+};
+
+/*
+ * Control of the PLL reset, with Ki, Kp, and Ka parameters
+ */
+struct iproc_pll_reset_ctrl {
+	unsigned int offset;
+	unsigned int reset_shift;
+	unsigned int p_reset_shift;
+	unsigned int ki_shift;
+	unsigned int ki_width;
+	unsigned int kp_shift;
+	unsigned int kp_width;
+	unsigned int ka_shift;
+	unsigned int ka_width;
+};
+
+struct iproc_pll_vco_ctrl {
+	unsigned int u_offset;
+	unsigned int l_offset;
+};
+
+/*
+ * Main PLL control parameters
+ */
+struct iproc_pll_ctrl {
+	unsigned long flags;
+	struct iproc_pll_aon_pwr_ctrl aon;
+	struct iproc_asiu_gate asiu;
+	struct iproc_pll_reset_ctrl reset;
+	struct iproc_clk_reg_op ndiv_int;
+	struct iproc_clk_reg_op ndiv_frac;
+	struct iproc_clk_reg_op pdiv;
+	struct iproc_pll_vco_ctrl vco_ctrl;
+	struct iproc_clk_reg_op status;
+};
+
+/*
+ * Controls enabling/disabling a PLL derived clock
+ */
+struct iproc_clk_enable_ctrl {
+	unsigned int offset;
+	unsigned int enable_shift;
+	unsigned int hold_shift;
+	unsigned int bypass_shift;
+};
+
+/*
+ * Main clock control parameters for clocks derived from the PLLs
+ */
+struct iproc_clk_ctrl {
+	unsigned int channel;
+	unsigned long flags;
+	struct iproc_clk_enable_ctrl enable;
+	struct iproc_clk_reg_op mdiv;
+};
+
+/*
+ * Divisor of the ASIU clocks
+ */
+struct iproc_asiu_div {
+	unsigned int offset;
+	unsigned int en_shift;
+	unsigned int high_shift;
+	unsigned int high_width;
+	unsigned int low_shift;
+	unsigned int low_width;
+};
+
+extern void iproc_armpll_setup(struct device_node *node);
+extern void iproc_pll_setup(struct device_node *node,
+			    const struct iproc_pll_ctrl *ctrl,
+			    const struct iproc_pll_vco_freq_param *vco_param,
+			    unsigned int num_freqs);
+extern void iproc_clk_setup(struct device_node *node,
+			    const struct iproc_clk_ctrl *ctrl,
+			    unsigned int num_clks);
+extern void iproc_asiu_setup(struct device_node *node,
+			     const struct iproc_asiu_div *div,
+			     const struct iproc_asiu_gate *gate,
+			     unsigned int num_clks);
+
+#endif /* _CLK_IPROC_H */
-- 
1.7.9.5

[PATCH v5 3/6] clk: iproc: add initial common clock support

[Ray Jui]

This adds basic and generic support for various iProc PLLs and clocks
including the ARMPLL, GENPLL, LCPLL, MIPIPLL, and ASIU clocks.

SoCs under the iProc architecture can define their specific register
offsets and clock parameters for their PLL and clock controllers. These
parameters can be passed as arugments into the generic iProc PLL and
clock setup functions

Derived from code originally provided by Jonathan Richardson
<jonathar@broadcom.com>

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/clk/bcm/Kconfig            |    9 +
 drivers/clk/bcm/Makefile           |    1 +
 drivers/clk/bcm/clk-iproc-armpll.c |  282 ++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc-asiu.c   |  275 +++++++++++++++++++++
 drivers/clk/bcm/clk-iproc-clk.c    |  238 +++++++++++++++++++
 drivers/clk/bcm/clk-iproc-pll.c    |  461 ++++++++++++++++++++++++++++++++++++
 drivers/clk/bcm/clk-iproc.h        |  157 ++++++++++++
 7 files changed, 1423 insertions(+)
 create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
 create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
 create mode 100644 drivers/clk/bcm/clk-iproc-clk.c
 create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
 create mode 100644 drivers/clk/bcm/clk-iproc.h

diff --git a/drivers/clk/bcm/Kconfig b/drivers/clk/bcm/Kconfig
index 75506e5..66b5b7f 100644
--- a/drivers/clk/bcm/Kconfig
+++ b/drivers/clk/bcm/Kconfig
@@ -7,3 +7,12 @@ config CLK_BCM_KONA
 	  Enable common clock framework support for Broadcom SoCs
 	  using "Kona" style clock control units, including those
 	  in the BCM281xx and BCM21664 families.
+
+config COMMON_CLK_IPROC
+	bool "Broadcom iProc clock support"
+	depends on ARCH_BCM_IPROC
+	depends on COMMON_CLK
+	default y
+	help
+	  Enable common clock framework support for Broadcom SoCs
+	  based on the "iProc" architecture
diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
index 6297d05..6926636 100644
--- a/drivers/clk/bcm/Makefile
+++ b/drivers/clk/bcm/Makefile
@@ -2,3 +2,4 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
+obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
diff --git a/drivers/clk/bcm/clk-iproc-armpll.c b/drivers/clk/bcm/clk-iproc-armpll.c
new file mode 100644
index 0000000..965cd4e
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-armpll.c
@@ -0,0 +1,282 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+
+#define IPROC_CLK_MAX_FREQ_POLICY                    0x3
+#define IPROC_CLK_POLICY_FREQ_OFFSET                 0x008
+#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT      8
+#define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK       0x7
+
+#define IPROC_CLK_PLLARMA_OFFSET                     0xc00
+#define IPROC_CLK_PLLARMA_LOCK_SHIFT                 28
+#define IPROC_CLK_PLLARMA_PDIV_SHIFT                 24
+#define IPROC_CLK_PLLARMA_PDIV_MASK                  0xf
+#define IPROC_CLK_PLLARMA_NDIV_INT_SHIFT             8
+#define IPROC_CLK_PLLARMA_NDIV_INT_MASK              0x3ff
+
+#define IPROC_CLK_PLLARMB_OFFSET                     0xc04
+#define IPROC_CLK_PLLARMB_NDIV_FRAC_MASK             0xfffff
+
+#define IPROC_CLK_PLLARMC_OFFSET                     0xc08
+#define IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT            8
+#define IPROC_CLK_PLLARMC_MDIV_MASK                  0xff
+
+#define IPROC_CLK_PLLARMCTL5_OFFSET                  0xc20
+#define IPROC_CLK_PLLARMCTL5_H_MDIV_MASK             0xff
+
+#define IPROC_CLK_PLLARM_OFFSET_OFFSET               0xc24
+#define IPROC_CLK_PLLARM_SW_CTL_SHIFT                29
+#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT       20
+#define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK        0xff
+#define IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK       0xfffff
+
+#define IPROC_CLK_ARM_DIV_OFFSET                     0xe00
+#define IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT  4
+#define IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK        0xf
+
+#define IPROC_CLK_POLICY_DBG_OFFSET                  0xec0
+#define IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT          12
+#define IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK           0x7
+
+enum iproc_arm_pll_fid {
+	ARM_PLL_FID_CRYSTAL_CLK   = 0,
+	ARM_PLL_FID_SYS_CLK       = 2,
+	ARM_PLL_FID_CH0_SLOW_CLK  = 6,
+	ARM_PLL_FID_CH1_FAST_CLK  = 7
+};
+
+struct iproc_arm_pll {
+	struct clk_hw hw;
+	void __iomem *base;
+	unsigned long rate;
+};
+
+#define to_iproc_arm_pll(hw) container_of(hw, struct iproc_arm_pll, hw)
+
+static unsigned int __get_fid(struct iproc_arm_pll *pll)
+{
+	u32 val;
+	unsigned int policy, fid, active_fid;
+
+	val = readl(pll->base + IPROC_CLK_ARM_DIV_OFFSET);
+	if (val & (1 << IPROC_CLK_ARM_DIV_PLL_SELECT_OVERRIDE_SHIFT))
+		policy = val & IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK;
+	else
+		policy = 0;
+
+	/* something is seriously wrong */
+	BUG_ON(policy > IPROC_CLK_MAX_FREQ_POLICY);
+
+	val = readl(pll->base + IPROC_CLK_POLICY_FREQ_OFFSET);
+	fid = (val >> (IPROC_CLK_POLICY_FREQ_POLICY_FREQ_SHIFT * policy)) &
+		IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK;
+
+	val = readl(pll->base + IPROC_CLK_POLICY_DBG_OFFSET);
+	active_fid = IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK &
+		(val >> IPROC_CLK_POLICY_DBG_ACT_FREQ_SHIFT);
+	if (fid != active_fid) {
+		pr_debug("%s: fid override %u->%u\n", __func__,	fid,
+				active_fid);
+		fid = active_fid;
+	}
+
+	pr_debug("%s: active fid: %u\n", __func__, fid);
+
+	return fid;
+}
+
+/*
+ * Determine the mdiv (post divider) based on the frequency ID being used.
+ * There are 4 sources that can be used to derive the output clock rate:
+ *    - 25 MHz Crystal
+ *    - System clock
+ *    - PLL channel 0 (slow clock)
+ *    - PLL channel 1 (fast clock)
+ */
+static int __get_mdiv(struct iproc_arm_pll *pll)
+{
+	unsigned int fid;
+	int mdiv;
+	u32 val;
+
+	fid = __get_fid(pll);
+
+	switch (fid) {
+	case ARM_PLL_FID_CRYSTAL_CLK:
+	case ARM_PLL_FID_SYS_CLK:
+		mdiv = 1;
+		break;
+
+	case ARM_PLL_FID_CH0_SLOW_CLK:
+		val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
+		mdiv = val & IPROC_CLK_PLLARMC_MDIV_MASK;
+		if (mdiv == 0)
+			mdiv = 256;
+		break;
+
+	case ARM_PLL_FID_CH1_FAST_CLK:
+		val = readl(pll->base +	IPROC_CLK_PLLARMCTL5_OFFSET);
+		mdiv = val & IPROC_CLK_PLLARMCTL5_H_MDIV_MASK;
+		if (mdiv == 0)
+			mdiv = 256;
+		break;
+
+	default:
+		mdiv = -EFAULT;
+	}
+
+	return mdiv;
+}
+
+static unsigned int __get_ndiv(struct iproc_arm_pll *pll)
+{
+	u32 val;
+	unsigned int ndiv_int, ndiv_frac, ndiv;
+
+	val = readl(pll->base + IPROC_CLK_PLLARM_OFFSET_OFFSET);
+	if (val & (1 << IPROC_CLK_PLLARM_SW_CTL_SHIFT)) {
+		/*
+		 * offset mode is active. Read the ndiv from the PLLARM OFFSET
+		 * register
+		 */
+		ndiv_int = (val >> IPROC_CLK_PLLARM_NDIV_INT_OFFSET_SHIFT) &
+			IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK;
+		if (ndiv_int == 0)
+			ndiv_int = 256;
+
+		ndiv_frac = val & IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK;
+	} else {
+		/* offset mode not active */
+		val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
+		ndiv_int = (val >> IPROC_CLK_PLLARMA_NDIV_INT_SHIFT) &
+			IPROC_CLK_PLLARMA_NDIV_INT_MASK;
+		if (ndiv_int == 0)
+			ndiv_int = 1024;
+
+		val = readl(pll->base + IPROC_CLK_PLLARMB_OFFSET);
+		ndiv_frac = val & IPROC_CLK_PLLARMB_NDIV_FRAC_MASK;
+	}
+
+	ndiv = (ndiv_int << 20) | ndiv_frac;
+
+	return ndiv;
+}
+
+/*
+ * The output frequency of the ARM PLL is calculated based on the ARM PLL
+ * divider values:
+ *   pdiv = ARM PLL pre-divider
+ *   ndiv = ARM PLL multiplier
+ *   mdiv = ARM PLL post divider
+ *
+ * The frequency is calculated by:
+ *   ((ndiv * parent clock rate) / pdiv) / mdiv
+ */
+static unsigned long iproc_arm_pll_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_arm_pll *pll = to_iproc_arm_pll(hw);
+	u32 val;
+	int mdiv;
+	u64 ndiv;
+	unsigned int pdiv;
+
+	/* in bypass mode, use parent rate */
+	val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);
+	if (val & (1 << IPROC_CLK_PLLARMC_BYPCLK_EN_SHIFT)) {
+		pll->rate = parent_rate;
+		return pll->rate;
+	}
+
+	/* PLL needs to be locked */
+	val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);
+	if (!(val & (1 << IPROC_CLK_PLLARMA_LOCK_SHIFT))) {
+		pll->rate = 0;
+		return 0;
+	}
+
+	pdiv = (val >> IPROC_CLK_PLLARMA_PDIV_SHIFT) &
+		IPROC_CLK_PLLARMA_PDIV_MASK;
+	if (pdiv == 0)
+		pdiv = 16;
+
+	ndiv = __get_ndiv(pll);
+	mdiv = __get_mdiv(pll);
+	if (mdiv <= 0) {
+		pll->rate = 0;
+		return 0;
+	}
+	pll->rate = (ndiv * parent_rate) >> 20;
+	pll->rate = (pll->rate / pdiv) / mdiv;
+
+	pr_debug("%s: ARM PLL rate: %lu. parent rate: %lu\n", __func__,
+			pll->rate, parent_rate);
+	pr_debug("%s: ndiv_int: %u, pdiv: %u, mdiv: %d\n", __func__,
+			(unsigned int)(ndiv >> 20), pdiv, mdiv);
+
+	return pll->rate;
+}
+
+static const struct clk_ops iproc_arm_pll_ops = {
+	.recalc_rate = iproc_arm_pll_recalc_rate,
+};
+
+void __init iproc_armpll_setup(struct device_node *node)
+{
+	int ret;
+	struct clk *clk;
+	struct iproc_arm_pll *pll;
+	struct clk_init_data init;
+	const char *parent_name;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->base = of_iomap(node, 0);
+	if (WARN_ON(!pll->base))
+		goto err_free_pll;
+
+	init.name = node->name;
+	init.ops = &iproc_arm_pll_ops;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	pll->hw.init = &init;
+
+	clk = clk_register(NULL, &pll->hw);
+	if (WARN_ON(IS_ERR(clk)))
+		goto err_iounmap;
+
+	ret = of_clk_add_provider(node, of_clk_src_simple_get, clk);
+	if (WARN_ON(ret))
+		goto err_clk_unregister;
+
+	return;
+
+err_clk_unregister:
+	clk_unregister(clk);
+err_iounmap:
+	iounmap(pll->base);
+err_free_pll:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc-asiu.c b/drivers/clk/bcm/clk-iproc-asiu.c
new file mode 100644
index 0000000..ab86b8c
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-asiu.c
@@ -0,0 +1,275 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+struct iproc_asiu;
+
+struct iproc_asiu_clk {
+	struct clk_hw hw;
+	const char *name;
+	struct iproc_asiu *asiu;
+	unsigned long rate;
+	struct iproc_asiu_div div;
+	struct iproc_asiu_gate gate;
+};
+
+struct iproc_asiu {
+	void __iomem *div_base;
+	void __iomem *gate_base;
+
+	struct clk_onecell_data clk_data;
+	struct iproc_asiu_clk *clks;
+};
+
+#define to_asiu_clk(hw) container_of(hw, struct iproc_asiu_clk, hw)
+
+static int iproc_asiu_clk_enable(struct clk_hw *hw)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+
+	/* some clocks at the ASIU level are always enabled */
+	if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
+		return 0;
+
+	val = readl(asiu->gate_base + clk->gate.offset);
+	val |= (1 << clk->gate.en_shift);
+	writel(val, asiu->gate_base + clk->gate.offset);
+
+	return 0;
+}
+
+static void iproc_asiu_clk_disable(struct clk_hw *hw)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+
+	/* some clocks at the ASIU level are always enabled */
+	if (clk->gate.offset == IPROC_CLK_INVALID_OFFSET)
+		return;
+
+	val = readl(asiu->gate_base + clk->gate.offset);
+	val &= ~(1 << clk->gate.en_shift);
+	writel(val, asiu->gate_base + clk->gate.offset);
+}
+
+static unsigned long iproc_asiu_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	u32 val;
+	unsigned int div_h, div_l;
+
+	if (parent_rate == 0) {
+		clk->rate = 0;
+		return 0;
+	}
+
+	/* if clock divisor is not enabled, simply return parent rate */
+	val = readl(asiu->div_base + clk->div.offset);
+	if ((val & (1 << clk->div.en_shift)) == 0) {
+		clk->rate = parent_rate;
+		return parent_rate;
+	}
+
+	/* clock rate = parent rate / (high_div + 1) + (low_div + 1) */
+	div_h = (val >> clk->div.high_shift) & bit_mask(clk->div.high_width);
+	div_h++;
+	div_l = (val >> clk->div.low_shift) & bit_mask(clk->div.low_width);
+	div_l++;
+
+	clk->rate = parent_rate / (div_h + div_l);
+	pr_debug("%s: rate: %lu. parent rate: %lu div_h: %u div_l: %u\n",
+		__func__, clk->rate, parent_rate, div_h, div_l);
+
+	return clk->rate;
+}
+
+static long iproc_asiu_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	unsigned int div;
+
+	if (rate == 0 || *parent_rate == 0)
+		return -EINVAL;
+
+	if (rate == *parent_rate)
+		return *parent_rate;
+
+	div = DIV_ROUND_UP(*parent_rate, rate);
+	if (div < 2)
+		return *parent_rate;
+
+	return *parent_rate / div;
+}
+
+static int iproc_asiu_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct iproc_asiu_clk *clk = to_asiu_clk(hw);
+	struct iproc_asiu *asiu = clk->asiu;
+	unsigned int div, div_h, div_l;
+	u32 val;
+
+	if (rate == 0 || parent_rate == 0)
+		return -EINVAL;
+
+	/* simply disable the divisor if one wants the same rate as parent */
+	if (rate == parent_rate) {
+		val = readl(asiu->div_base + clk->div.offset);
+		val &= ~(1 << clk->div.en_shift);
+		writel(val, asiu->div_base + clk->div.offset);
+		return 0;
+	}
+
+	div = DIV_ROUND_UP(parent_rate, rate);
+	if (div < 2)
+		return -EINVAL;
+
+	div_h = div_l = div >> 1;
+	div_h--;
+	div_l--;
+
+	val = readl(asiu->div_base + clk->div.offset);
+	val |= 1 << clk->div.en_shift;
+	if (div_h) {
+		val &= ~(bit_mask(clk->div.high_width)
+				<< clk->div.high_shift);
+		val |= div_h << clk->div.high_shift;
+	} else {
+		val &= ~(bit_mask(clk->div.high_width)
+				<< clk->div.high_shift);
+	}
+	if (div_l) {
+		val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
+		val |= div_l << clk->div.low_shift;
+	} else {
+		val &= ~(bit_mask(clk->div.low_width) << clk->div.low_shift);
+	}
+	writel(val, asiu->div_base + clk->div.offset);
+
+	return 0;
+}
+
+static const struct clk_ops iproc_asiu_ops = {
+	.enable = iproc_asiu_clk_enable,
+	.disable = iproc_asiu_clk_disable,
+	.recalc_rate = iproc_asiu_clk_recalc_rate,
+	.round_rate = iproc_asiu_clk_round_rate,
+	.set_rate = iproc_asiu_clk_set_rate,
+};
+
+void __init iproc_asiu_setup(struct device_node *node,
+		const struct iproc_asiu_div *div,
+		const struct iproc_asiu_gate *gate, unsigned int num_clks)
+{
+	int i, ret;
+	struct iproc_asiu *asiu;
+
+	if (WARN_ON(!gate || !div))
+		return;
+
+	asiu = kzalloc(sizeof(*asiu), GFP_KERNEL);
+	if (WARN_ON(!asiu))
+		return;
+
+	asiu->clk_data.clk_num = num_clks;
+	asiu->clk_data.clks = kcalloc(num_clks, sizeof(*asiu->clk_data.clks),
+			GFP_KERNEL);
+	if (WARN_ON(!asiu->clk_data.clks))
+		goto err_clks;
+
+	asiu->clks = kcalloc(num_clks, sizeof(*asiu->clks), GFP_KERNEL);
+	if (WARN_ON(!asiu->clks))
+		goto err_asiu_clks;
+
+	asiu->div_base = of_iomap(node, 0);
+	if (WARN_ON(!asiu->div_base))
+		goto err_iomap_div;
+
+	asiu->gate_base = of_iomap(node, 1);
+	if (WARN_ON(!asiu->gate_base))
+		goto err_iomap_gate;
+
+	for (i = 0; i < num_clks; i++) {
+		struct clk_init_data init;
+		struct clk *clk;
+		const char *parent_name;
+		struct iproc_asiu_clk *asiu_clk;
+		const char *clk_name;
+
+		clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
+		if (WARN_ON(!clk_name))
+			goto err_clk_register;
+
+		ret = of_property_read_string_index(node, "clock-output-names",
+				i, &clk_name);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+
+		asiu_clk = &asiu->clks[i];
+		asiu_clk->name = clk_name;
+		asiu_clk->asiu = asiu;
+		asiu_clk->div = div[i];
+		asiu_clk->gate = gate[i];
+		init.name = clk_name;
+		init.ops = &iproc_asiu_ops;
+		init.flags = 0;
+		parent_name = of_clk_get_parent_name(node, 0);
+		init.parent_names = (parent_name ? &parent_name : NULL);
+		init.num_parents = (parent_name ? 1 : 0);
+		asiu_clk->hw.init = &init;
+
+		clk = clk_register(NULL, &asiu_clk->hw);
+		if (WARN_ON(IS_ERR(clk)))
+			goto err_clk_register;
+		asiu->clk_data.clks[i] = clk;
+	}
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get,
+			&asiu->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_register;
+
+	return;
+
+err_clk_register:
+	for (i = 0; i < num_clks; i++)
+		kfree(asiu->clks[i].name);
+	iounmap(asiu->gate_base);
+
+err_iomap_gate:
+	iounmap(asiu->div_base);
+
+err_iomap_div:
+	kfree(asiu->clks);
+
+err_asiu_clks:
+	kfree(asiu->clk_data.clks);
+
+err_clks:
+	kfree(asiu);
+}
diff --git a/drivers/clk/bcm/clk-iproc-clk.c b/drivers/clk/bcm/clk-iproc-clk.c
new file mode 100644
index 0000000..be3c42c
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-clk.c
@@ -0,0 +1,238 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+struct iproc_pll;
+
+struct iproc_clk {
+	struct clk_hw hw;
+	const char *name;
+	struct iproc_pll *pll;
+	unsigned long rate;
+	const struct iproc_clk_ctrl *ctrl;
+};
+
+struct iproc_pll {
+	void __iomem *base;
+	struct clk_onecell_data clk_data;
+	struct iproc_clk *clks;
+};
+
+#define to_iproc_clk(hw) container_of(hw, struct iproc_clk, hw)
+
+static int iproc_clk_enable(struct clk_hw *hw)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+
+	/* channel enable is active low */
+	val = readl(pll->base + ctrl->enable.offset);
+	val &= ~(1 << ctrl->enable.enable_shift);
+	writel(val, pll->base + ctrl->enable.offset);
+
+	/* also make sure channel is not held */
+	val = readl(pll->base + ctrl->enable.offset);
+	val &= ~(1 << ctrl->enable.hold_shift);
+	writel(val, pll->base + ctrl->enable.offset);
+
+	return 0;
+}
+
+static void iproc_clk_disable(struct clk_hw *hw)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+
+	if (ctrl->flags & IPROC_CLK_AON)
+		return;
+
+	val = readl(pll->base + ctrl->enable.offset);
+	val |= 1 << ctrl->enable.enable_shift;
+	writel(val, pll->base + ctrl->enable.offset);
+}
+
+static unsigned long iproc_clk_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+	unsigned int mdiv;
+
+	if (parent_rate == 0)
+		return 0;
+
+	val = readl(pll->base + ctrl->mdiv.offset);
+	mdiv = (val >> ctrl->mdiv.shift) & bit_mask(ctrl->mdiv.width);
+	if (mdiv == 0)
+		mdiv = 256;
+
+	clk->rate = parent_rate / mdiv;
+
+	return clk->rate;
+}
+
+static long iproc_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	unsigned int div;
+
+	if (rate == 0 || *parent_rate == 0)
+		return -EINVAL;
+
+	if (rate == *parent_rate)
+		return *parent_rate;
+
+	div = DIV_ROUND_UP(*parent_rate, rate);
+	if (div < 2)
+		return *parent_rate;
+
+	if (div > 256)
+		div = 256;
+
+	return *parent_rate / div;
+}
+
+static int iproc_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct iproc_clk *clk = to_iproc_clk(hw);
+	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
+	struct iproc_pll *pll = clk->pll;
+	u32 val;
+	unsigned int div;
+
+	if (rate == 0 || parent_rate == 0)
+		return -EINVAL;
+
+	div = DIV_ROUND_UP(parent_rate, rate);
+	if (div > 256)
+		return -EINVAL;
+
+	val = readl(pll->base + ctrl->mdiv.offset);
+	if (div == 256) {
+		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
+	} else {
+		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
+		val |= div << ctrl->mdiv.shift;
+	}
+	writel(val, pll->base + ctrl->mdiv.offset);
+	clk->rate = parent_rate / div;
+
+	return 0;
+}
+
+static const struct clk_ops iproc_clk_ops = {
+	.enable = iproc_clk_enable,
+	.disable = iproc_clk_disable,
+	.recalc_rate = iproc_clk_recalc_rate,
+	.round_rate = iproc_clk_round_rate,
+	.set_rate = iproc_clk_set_rate,
+};
+
+void __init iproc_clk_setup(struct device_node *node,
+		const struct iproc_clk_ctrl *ctrl, unsigned int num_clks)
+{
+	int i, ret;
+	struct iproc_pll *pll;
+
+	if (WARN_ON(!ctrl))
+		return;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->clk_data.clk_num = num_clks;
+	pll->clk_data.clks = kcalloc(num_clks, sizeof(*pll->clk_data.clks),
+			GFP_KERNEL);
+	if (WARN_ON(!pll->clk_data.clks))
+		goto err_clks;
+
+	pll->clks = kcalloc(num_clks, sizeof(*pll->clks), GFP_KERNEL);
+	if (WARN_ON(!pll->clks))
+		goto err_pll_clks;
+
+	pll->base = of_iomap(node, 0);
+	if (WARN_ON(!pll->base))
+		goto err_iomap;
+
+	for (i = 0; i < num_clks; i++) {
+		struct clk_init_data init;
+		struct clk *clk;
+		const char *parent_name;
+		struct iproc_clk *iclk;
+		const char *clk_name;
+
+		clk_name = kzalloc(IPROC_CLK_NAME_LEN, GFP_KERNEL);
+		if (WARN_ON(!clk_name))
+			goto err_clk_register;
+
+		ret = of_property_read_string_index(node, "clock-output-names",
+				i, &clk_name);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+
+		iclk = &pll->clks[i];
+		iclk->name = clk_name;
+		iclk->pll = pll;
+		iclk->ctrl = &ctrl[i];
+		init.name = clk_name;
+		init.ops = &iproc_clk_ops;
+		init.flags = 0;
+		parent_name = of_clk_get_parent_name(node, 0);
+		init.parent_names = (parent_name ? &parent_name : NULL);
+		init.num_parents = (parent_name ? 1 : 0);
+		iclk->hw.init = &init;
+
+		clk = clk_register(NULL, &iclk->hw);
+		if (WARN_ON(IS_ERR(clk)))
+			goto err_clk_register;
+		pll->clk_data.clks[i] = clk;
+	}
+
+	ret = of_clk_add_provider(node, of_clk_src_onecell_get, &pll->clk_data);
+	if (WARN_ON(ret))
+		goto err_clk_register;
+
+	return;
+
+err_clk_register:
+	for (i = 0; i < num_clks; i++)
+		kfree(pll->clks[i].name);
+	iounmap(pll->base);
+
+err_iomap:
+	kfree(pll->clks);
+
+err_pll_clks:
+	kfree(pll->clk_data.clks);
+
+err_clks:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc-pll.c b/drivers/clk/bcm/clk-iproc-pll.c
new file mode 100644
index 0000000..3b82cbd
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc-pll.c
@@ -0,0 +1,461 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include "clk-iproc.h"
+
+#define PLL_VCO_HIGH_SHIFT 19
+#define PLL_VCO_LOW_SHIFT  30
+
+/* number of delay loops waiting for PLL to lock */
+#define LOCK_DELAY 100
+
+/* number of VCO frequency bands */
+#define NUM_FREQ_BANDS 8
+
+#define NUM_KP_BANDS 3
+enum kp_band {
+	KP_BAND_MID = 0,
+	KP_BAND_HIGH,
+	KP_BAND_HIGH_HIGH
+};
+
+static const unsigned int kp_table[NUM_KP_BANDS][NUM_FREQ_BANDS] = {
+	{ 5, 6, 6, 7, 7, 8, 9, 10 },
+	{ 4, 4, 5, 5, 6, 7, 8, 9  },
+	{ 4, 5, 5, 6, 7, 8, 9, 10 },
+};
+
+static const unsigned long ref_freq_table[NUM_FREQ_BANDS][2] = {
+	{ 10000000,  12500000  },
+	{ 12500000,  15000000  },
+	{ 15000000,  20000000  },
+	{ 20000000,  25000000  },
+	{ 25000000,  50000000  },
+	{ 50000000,  75000000  },
+	{ 75000000,  100000000 },
+	{ 100000000, 125000000 },
+};
+
+enum vco_freq_range {
+	VCO_LOW       = 700000000U,
+	VCO_MID       = 1200000000U,
+	VCO_HIGH      = 2200000000U,
+	VCO_HIGH_HIGH = 3100000000U,
+	VCO_MAX       = 4000000000U,
+};
+
+struct iproc_pll {
+	struct clk_hw hw;
+	void __iomem *pll_base;
+	void __iomem *pwr_base;
+	void __iomem *asiu_base;
+	const char *name;
+	const struct iproc_pll_ctrl *ctrl;
+	const struct iproc_pll_vco_freq_param *vco_param;
+	unsigned int num_vco_entries;
+	unsigned long rate;
+};
+
+#define to_iproc_pll(hw) container_of(hw, struct iproc_pll, hw)
+
+/*
+ * Based on the target frequency, find a match from the VCO frequency parameter
+ * table and return its index
+ */
+static int pll_get_rate_index(struct iproc_pll *pll, unsigned int target_rate)
+{
+	int i;
+
+	for (i = 0; i < pll->num_vco_entries; i++)
+		if (target_rate == pll->vco_param[i].rate)
+			break;
+
+	if (i >= pll->num_vco_entries)
+		return -EINVAL;
+
+	return i;
+}
+
+static int get_kp(unsigned long ref_freq, enum kp_band kp_index)
+{
+	int i;
+
+	if (ref_freq < ref_freq_table[0][0])
+		return -EINVAL;
+
+	for (i = 0; i < NUM_FREQ_BANDS; i++) {
+		if (ref_freq >= ref_freq_table[i][0] &&
+			ref_freq < ref_freq_table[i][1])
+			return kp_table[kp_index][i];
+	}
+	return -EINVAL;
+}
+
+static int pll_wait_for_lock(struct iproc_pll *pll)
+{
+	int i;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+
+	for (i = 0; i < LOCK_DELAY; i++) {
+		u32 val = readl(pll->pll_base + ctrl->status.offset);
+
+		if (val & (1 << ctrl->status.shift))
+			return 0;
+		udelay(10);
+	}
+
+	return -EIO;
+}
+
+static void __pll_disable(struct iproc_pll *pll)
+{
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		val = readl(pll->asiu_base + ctrl->asiu.offset);
+		val &= ~(1 << ctrl->asiu.en_shift);
+		writel(val, pll->asiu_base + ctrl->asiu.offset);
+	}
+
+	/* latch input value so core power can be shut down */
+	val = readl(pll->pwr_base + ctrl->aon.offset);
+	val |= (1 << ctrl->aon.iso_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+
+	/* power down the core */
+	val &= ~(bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+}
+
+static int __pll_enable(struct iproc_pll *pll)
+{
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+
+	/* power up the PLL and make sure it's not latched */
+	val = readl(pll->pwr_base + ctrl->aon.offset);
+	val |= bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift;
+	val &= ~(1 << ctrl->aon.iso_shift);
+	writel(val, pll->pwr_base + ctrl->aon.offset);
+
+	/* certain PLLs also need to be ungated from the ASIU top level */
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		val = readl(pll->asiu_base + ctrl->asiu.offset);
+		val |= (1 << ctrl->asiu.en_shift);
+		writel(val, pll->asiu_base + ctrl->asiu.offset);
+	}
+
+	return 0;
+}
+
+static void __pll_put_in_reset(struct iproc_pll *pll)
+{
+	u32 val;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
+
+	val = readl(pll->pll_base + reset->offset);
+	val &= ~(1 << reset->reset_shift | 1 << reset->p_reset_shift);
+	writel(val, pll->pll_base + reset->offset);
+}
+
+static void __pll_bring_out_reset(struct iproc_pll *pll, unsigned int kp,
+		unsigned int ka, unsigned int ki)
+{
+	u32 val;
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
+
+	val = readl(pll->pll_base + reset->offset);
+	val &= ~(bit_mask(reset->ki_width) << reset->ki_shift |
+		bit_mask(reset->kp_width) << reset->kp_shift |
+		bit_mask(reset->ka_width) << reset->ka_shift);
+	val |=  ki << reset->ki_shift | kp << reset->kp_shift |
+		ka << reset->ka_shift;
+	val |= 1 << reset->reset_shift | 1 << reset->p_reset_shift;
+	writel(val, pll->pll_base + reset->offset);
+}
+
+static int pll_set_rate(struct iproc_pll *pll, unsigned int rate_index,
+		unsigned long parent_rate)
+{
+	const struct iproc_pll_vco_freq_param *vco =
+				&pll->vco_param[rate_index];
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	int ka = 0, ki, kp, ret;
+	unsigned long rate = vco->rate;
+	u32 val;
+	enum kp_band kp_index;
+	unsigned long ref_freq;
+
+	/*
+	 * reference frequency = parent frequency / PDIV
+	 * If PDIV = 0, then it becomes a multiplier (x2)
+	 */
+	if (vco->pdiv == 0)
+		ref_freq = parent_rate * 2;
+	else
+		ref_freq = parent_rate / vco->pdiv;
+
+	/* determine Ki and Kp index based on target VCO frequency */
+	if (rate >= VCO_LOW && rate < VCO_HIGH) {
+		ki = 4;
+		kp_index = KP_BAND_MID;
+	} else if (rate >= VCO_HIGH && rate && rate < VCO_HIGH_HIGH) {
+		ki = 3;
+		kp_index = KP_BAND_HIGH;
+	} else if (rate >= VCO_HIGH_HIGH && rate < VCO_MAX) {
+		ki = 3;
+		kp_index = KP_BAND_HIGH_HIGH;
+	} else {
+		pr_err("%s: pll: %s has invalid rate: %lu\n", __func__,
+				pll->name, rate);
+		return -EINVAL;
+	}
+
+	kp = get_kp(ref_freq, kp_index);
+	if (kp < 0) {
+		pr_err("%s: pll: %s has invalid kp\n", __func__, pll->name);
+		return kp;
+	}
+
+	ret = __pll_enable(pll);
+	if (ret) {
+		pr_err("%s: pll: %s fails to enable\n", __func__, pll->name);
+		return ret;
+	}
+
+	/* put PLL in reset */
+	__pll_put_in_reset(pll);
+
+	writel(0, pll->pll_base + ctrl->vco_ctrl.u_offset);
+	val = readl(pll->pll_base + ctrl->vco_ctrl.l_offset);
+
+	if (rate >= VCO_LOW && rate < VCO_MID)
+		val |= (1 << PLL_VCO_LOW_SHIFT);
+
+	if (rate < VCO_HIGH)
+		val &= ~(1 << PLL_VCO_HIGH_SHIFT);
+	else
+		val |= (1 << PLL_VCO_HIGH_SHIFT);
+
+	writel(val, pll->pll_base + ctrl->vco_ctrl.l_offset);
+
+	/* program integer part of NDIV */
+	val = readl(pll->pll_base + ctrl->ndiv_int.offset);
+	val &= ~(bit_mask(ctrl->ndiv_int.width) << ctrl->ndiv_int.shift);
+	val |= vco->ndiv_int << ctrl->ndiv_int.shift;
+	writel(val, pll->pll_base + ctrl->ndiv_int.offset);
+
+	/* program fractional part of NDIV */
+	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
+		val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
+		val &= ~(bit_mask(ctrl->ndiv_frac.width) <<
+				ctrl->ndiv_frac.shift);
+		val |= vco->ndiv_frac << ctrl->ndiv_frac.shift;
+		writel(val, pll->pll_base + ctrl->ndiv_frac.offset);
+	}
+
+	/* program PDIV */
+	val = readl(pll->pll_base + ctrl->pdiv.offset);
+	val &= ~(bit_mask(ctrl->pdiv.width) << ctrl->pdiv.shift);
+	val |= vco->pdiv << ctrl->pdiv.shift;
+	writel(val, pll->pll_base + ctrl->pdiv.offset);
+
+	__pll_bring_out_reset(pll, kp, ka, ki);
+
+	ret = pll_wait_for_lock(pll);
+	if (ret < 0) {
+		pr_err("%s: pll: %s failed to lock\n", __func__, pll->name);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int iproc_pll_enable(struct clk_hw *hw)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+
+	return __pll_enable(pll);
+}
+
+static void iproc_pll_disable(struct clk_hw *hw)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+
+	if (ctrl->flags & IPROC_CLK_AON)
+		return;
+
+	__pll_disable(pll);
+}
+
+static unsigned long iproc_pll_recalc_rate(struct clk_hw *hw,
+	unsigned long parent_rate)
+{
+	struct iproc_pll *pll = to_iproc_pll(hw);
+	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
+	u32 val;
+	u64 ndiv;
+	unsigned int ndiv_int, ndiv_frac, pdiv;
+
+	if (parent_rate == 0)
+		return 0;
+
+	/* PLL needs to be locked */
+	val = readl(pll->pll_base + ctrl->status.offset);
+	if ((val & (1 << ctrl->status.shift)) == 0) {
+		pll->rate = 0;
+		return 0;
+	}
+
+	/*
+	 * PLL output frequency =
+	 *
+	 * ((ndiv_int + ndiv_frac / 2^20) * (parent clock rate / pdiv)
+	 */
+	val = readl(pll->pll_base + ctrl->ndiv_int.offset);
+	ndiv_int = (val >> ctrl->ndiv_int.shift) &
+		bit_mask(ctrl->ndiv_int.width);
+	ndiv = ndiv_int << ctrl->ndiv_int.shift;
+
+	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
+		val = readl(pll->pll_base + ctrl->ndiv_frac.offset);
+		ndiv_frac = (val >> ctrl->ndiv_frac.shift) &
+			bit_mask(ctrl->ndiv_frac.width);
+
+		if (ndiv_frac != 0)
+			ndiv = (ndiv_int << ctrl->ndiv_int.shift) | ndiv_frac;
+	}
+
+	val = readl(pll->pll_base + ctrl->pdiv.offset);
+	pdiv = (val >> ctrl->pdiv.shift) & bit_mask(ctrl->pdiv.width);
+
+	pll->rate = (ndiv * parent_rate) >> ctrl->ndiv_int.shift;
+
+	if (pdiv == 0)
+		pll->rate *= 2;
+	else
+		pll->rate /= pdiv;
+
+	return pll->rate;
+}
+
+static const struct clk_ops iproc_pll_ops = {
+	.enable = iproc_pll_enable,
+	.disable = iproc_pll_disable,
+	.recalc_rate = iproc_pll_recalc_rate,
+};
+
+void __init iproc_pll_setup(struct device_node *node,
+		const struct iproc_pll_ctrl *ctrl,
+		const struct iproc_pll_vco_freq_param *vco_param,
+		unsigned int num_vco_entries)
+{
+	int ret;
+	struct clk *clk;
+	struct iproc_pll *pll;
+	struct clk_init_data init;
+	const char *parent_name;
+	unsigned int rate;
+
+	if (WARN_ON(!ctrl))
+		return;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (WARN_ON(!pll))
+		return;
+
+	pll->pll_base = of_iomap(node, 0);
+	if (WARN_ON(!pll->pll_base))
+		goto err_pll_iomap;
+
+	pll->pwr_base = of_iomap(node, 1);
+	if (WARN_ON(!pll->pwr_base))
+		goto err_pwr_iomap;
+
+	/* some PLLs require gating control at the top ASIU level */
+	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
+		pll->asiu_base = of_iomap(node, 2);
+		if (WARN_ON(!pll->asiu_base))
+			goto err_asiu_iomap;
+	}
+
+	pll->ctrl = ctrl;
+	pll->name = node->name;
+	init.name = node->name;
+	init.ops = &iproc_pll_ops;
+	init.flags = 0;
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	pll->hw.init = &init;
+
+	/* configure the PLL to the desired VCO frequency if specified */
+	ret = of_property_read_u32(node, "clock-frequency", &rate);
+	if (!ret) {
+		unsigned long parent_rate;
+		int rate_index;
+
+		if (WARN_ON(!vco_param))
+			goto err_clk_register;
+
+		pll->num_vco_entries = num_vco_entries;
+		pll->vco_param = vco_param;
+
+		parent_rate = of_clk_get_parent_rate(node, 0);
+		if (WARN_ON(!parent_rate))
+			goto err_clk_register;
+
+		rate_index = pll_get_rate_index(pll, rate);
+		if (WARN_ON(rate_index < 0))
+			goto err_clk_register;
+
+		ret = pll_set_rate(pll, rate_index, parent_rate);
+		if (WARN_ON(ret))
+			goto err_clk_register;
+	}
+
+	clk = clk_register(NULL, &pll->hw);
+	if (WARN_ON(IS_ERR(clk)))
+		goto err_clk_register;
+
+	ret = of_clk_add_provider(node, of_clk_src_simple_get, clk);
+	if (WARN_ON(ret))
+		goto err_clk_add;
+
+	return;
+
+err_clk_add:
+	clk_unregister(clk);
+err_clk_register:
+	if (pll->asiu_base)
+		iounmap(pll->asiu_base);
+err_asiu_iomap:
+	iounmap(pll->pwr_base);
+err_pwr_iomap:
+	iounmap(pll->pll_base);
+err_pll_iomap:
+	kfree(pll);
+}
diff --git a/drivers/clk/bcm/clk-iproc.h b/drivers/clk/bcm/clk-iproc.h
new file mode 100644
index 0000000..cd01c1b
--- /dev/null
+++ b/drivers/clk/bcm/clk-iproc.h
@@ -0,0 +1,157 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _CLK_IPROC_H
+#define _CLK_IPROC_H
+
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/of.h>
+#include <linux/clk-provider.h>
+
+#define IPROC_CLK_NAME_LEN 25
+#define IPROC_CLK_INVALID_OFFSET 0xffffffff
+#define bit_mask(width) ((1 << (width)) - 1)
+
+/* clock should not be disabled at runtime */
+#define IPROC_CLK_AON BIT(0)
+
+/* PLL requires gating through ASIU */
+#define IPROC_CLK_PLL_ASIU BIT(1)
+
+/* PLL has fractional part of the NDIV */
+#define IPROC_CLK_PLL_HAS_NDIV_FRAC BIT(2)
+
+/*
+ * Parameters for VCO frequency configuration
+ *
+ * VCO frequency =
+ * ((ndiv_int + ndiv_frac / 2^20) * (ref freqeuncy  / pdiv)
+ */
+struct iproc_pll_vco_freq_param {
+	unsigned long rate;
+	unsigned int ndiv_int;
+	unsigned int ndiv_frac;
+	unsigned int pdiv;
+};
+
+struct iproc_clk_reg_op {
+	unsigned int offset;
+	unsigned int shift;
+	unsigned int width;
+};
+
+/*
+ * Clock gating control@the top ASIU level
+ */
+struct iproc_asiu_gate {
+	unsigned int offset;
+	unsigned int en_shift;
+};
+
+/*
+ * Control of powering on/off of a PLL
+ *
+ * Before powering off a PLL, input isolation (ISO) needs to be enabled
+ */
+struct iproc_pll_aon_pwr_ctrl {
+	unsigned int offset;
+	unsigned int pwr_width;
+	unsigned int pwr_shift;
+	unsigned int iso_shift;
+};
+
+/*
+ * Control of the PLL reset, with Ki, Kp, and Ka parameters
+ */
+struct iproc_pll_reset_ctrl {
+	unsigned int offset;
+	unsigned int reset_shift;
+	unsigned int p_reset_shift;
+	unsigned int ki_shift;
+	unsigned int ki_width;
+	unsigned int kp_shift;
+	unsigned int kp_width;
+	unsigned int ka_shift;
+	unsigned int ka_width;
+};
+
+struct iproc_pll_vco_ctrl {
+	unsigned int u_offset;
+	unsigned int l_offset;
+};
+
+/*
+ * Main PLL control parameters
+ */
+struct iproc_pll_ctrl {
+	unsigned long flags;
+	struct iproc_pll_aon_pwr_ctrl aon;
+	struct iproc_asiu_gate asiu;
+	struct iproc_pll_reset_ctrl reset;
+	struct iproc_clk_reg_op ndiv_int;
+	struct iproc_clk_reg_op ndiv_frac;
+	struct iproc_clk_reg_op pdiv;
+	struct iproc_pll_vco_ctrl vco_ctrl;
+	struct iproc_clk_reg_op status;
+};
+
+/*
+ * Controls enabling/disabling a PLL derived clock
+ */
+struct iproc_clk_enable_ctrl {
+	unsigned int offset;
+	unsigned int enable_shift;
+	unsigned int hold_shift;
+	unsigned int bypass_shift;
+};
+
+/*
+ * Main clock control parameters for clocks derived from the PLLs
+ */
+struct iproc_clk_ctrl {
+	unsigned int channel;
+	unsigned long flags;
+	struct iproc_clk_enable_ctrl enable;
+	struct iproc_clk_reg_op mdiv;
+};
+
+/*
+ * Divisor of the ASIU clocks
+ */
+struct iproc_asiu_div {
+	unsigned int offset;
+	unsigned int en_shift;
+	unsigned int high_shift;
+	unsigned int high_width;
+	unsigned int low_shift;
+	unsigned int low_width;
+};
+
+extern void iproc_armpll_setup(struct device_node *node);
+extern void iproc_pll_setup(struct device_node *node,
+			    const struct iproc_pll_ctrl *ctrl,
+			    const struct iproc_pll_vco_freq_param *vco_param,
+			    unsigned int num_freqs);
+extern void iproc_clk_setup(struct device_node *node,
+			    const struct iproc_clk_ctrl *ctrl,
+			    unsigned int num_clks);
+extern void iproc_asiu_setup(struct device_node *node,
+			     const struct iproc_asiu_div *div,
+			     const struct iproc_asiu_gate *gate,
+			     unsigned int num_clks);
+
+#endif /* _CLK_IPROC_H */
-- 
1.7.9.5

[PATCH v5 4/6] clk: Change bcm clocks build dependency

[Ray Jui]

The clock code under drivers/clk/bcm now contains code for both the
Broadcom mobile SoCs and the iProc SoCs. Change the the makefile
dependency to be under config flag CONFIG_ARCH_BCM that's enabled for
both families of SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 drivers/clk/Makefile |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index d5fba5b..eff0213 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -41,7 +41,7 @@ obj-$(CONFIG_ARCH_VT8500)		+= clk-vt8500.o
 obj-$(CONFIG_COMMON_CLK_WM831X)		+= clk-wm831x.o
 obj-$(CONFIG_COMMON_CLK_XGENE)		+= clk-xgene.o
 obj-$(CONFIG_COMMON_CLK_AT91)		+= at91/
-obj-$(CONFIG_ARCH_BCM_MOBILE)		+= bcm/
+obj-$(CONFIG_ARCH_BCM)			+= bcm/
 obj-$(CONFIG_ARCH_BERLIN)		+= berlin/
 obj-$(CONFIG_ARCH_HI3xxx)		+= hisilicon/
 obj-$(CONFIG_ARCH_HIP04)		+= hisilicon/
-- 
1.7.9.5

[PATCH v5 4/6] clk: Change bcm clocks build dependency

[Ray Jui]

The clock code under drivers/clk/bcm now contains code for both the
Broadcom mobile SoCs and the iProc SoCs. Change the the makefile
dependency to be under config flag CONFIG_ARCH_BCM that's enabled for
both families of SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 drivers/clk/Makefile |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index d5fba5b..eff0213 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -41,7 +41,7 @@ obj-$(CONFIG_ARCH_VT8500)		+= clk-vt8500.o
 obj-$(CONFIG_COMMON_CLK_WM831X)		+= clk-wm831x.o
 obj-$(CONFIG_COMMON_CLK_XGENE)		+= clk-xgene.o
 obj-$(CONFIG_COMMON_CLK_AT91)		+= at91/
-obj-$(CONFIG_ARCH_BCM_MOBILE)		+= bcm/
+obj-$(CONFIG_ARCH_BCM)			+= bcm/
 obj-$(CONFIG_ARCH_BERLIN)		+= berlin/
 obj-$(CONFIG_ARCH_HI3xxx)		+= hisilicon/
 obj-$(CONFIG_ARCH_HIP04)		+= hisilicon/
-- 
1.7.9.5

[PATCH v5 4/6] clk: Change bcm clocks build dependency

[Ray Jui]

The clock code under drivers/clk/bcm now contains code for both the
Broadcom mobile SoCs and the iProc SoCs. Change the the makefile
dependency to be under config flag CONFIG_ARCH_BCM that's enabled for
both families of SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 drivers/clk/Makefile |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index d5fba5b..eff0213 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -41,7 +41,7 @@ obj-$(CONFIG_ARCH_VT8500)		+= clk-vt8500.o
 obj-$(CONFIG_COMMON_CLK_WM831X)		+= clk-wm831x.o
 obj-$(CONFIG_COMMON_CLK_XGENE)		+= clk-xgene.o
 obj-$(CONFIG_COMMON_CLK_AT91)		+= at91/
-obj-$(CONFIG_ARCH_BCM_MOBILE)		+= bcm/
+obj-$(CONFIG_ARCH_BCM)			+= bcm/
 obj-$(CONFIG_ARCH_BERLIN)		+= berlin/
 obj-$(CONFIG_ARCH_HI3xxx)		+= hisilicon/
 obj-$(CONFIG_ARCH_HIP04)		+= hisilicon/
-- 
1.7.9.5

[PATCH v5 5/6] clk: cygnus: add clock support for Broadcom Cygnus

[Ray Jui]

The Broadcom Cygnus SoC is architected under the iProc architecture. It
has the following PLLs: ARMPLL, GENPLL, LCPLL0, MIPIPLL, all dervied
from an onboard crystal. Cygnus also has various ASIU clocks that are
derived directly from the onboard crystal.

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/clk/bcm/Makefile               |    1 +
 drivers/clk/bcm/clk-cygnus.c           |  277 ++++++++++++++++++++++++++++++++
 include/dt-bindings/clock/bcm-cygnus.h |   65 ++++++++
 3 files changed, 343 insertions(+)
 create mode 100644 drivers/clk/bcm/clk-cygnus.c
 create mode 100644 include/dt-bindings/clock/bcm-cygnus.h

diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
index 6926636..afcbe55 100644
--- a/drivers/clk/bcm/Makefile
+++ b/drivers/clk/bcm/Makefile
@@ -3,3 +3,4 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
 obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
+obj-$(CONFIG_ARCH_BCM_CYGNUS)	+= clk-cygnus.o
diff --git a/drivers/clk/bcm/clk-cygnus.c b/drivers/clk/bcm/clk-cygnus.c
new file mode 100644
index 0000000..f1dbfd7
--- /dev/null
+++ b/drivers/clk/bcm/clk-cygnus.c
@@ -0,0 +1,277 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include <dt-bindings/clock/bcm-cygnus.h>
+#include "clk-iproc.h"
+
+#define reg_val(o, s, w) { .offset = o, .shift = s, .width = w, }
+
+#define aon_val(o, pw, ps, is) { .offset = o, .pwr_width = pw, \
+	.pwr_shift = ps, .iso_shift = is }
+
+#define asiu_div_val(o, es, hs, hw, ls, lw) \
+		{ .offset = o, .en_shift = es, .high_shift = hs, \
+		.high_width = hw, .low_shift = ls, .low_width = lw }
+
+#define reset_val(o, rs, prs, kis, kiw, kps, kpw, kas, kaw) { .offset = o, \
+	.reset_shift = rs, .p_reset_shift = prs, .ki_shift = kis, \
+	.ki_width = kiw, .kp_shift = kps, .kp_width = kpw, .ka_shift = kas, \
+	.ka_width = kaw }
+
+#define vco_ctrl_val(uo, lo) { .u_offset = uo, .l_offset = lo }
+
+#define enable_val(o, es, hs, bs) { .offset = o, .enable_shift = es, \
+	.hold_shift = hs, .bypass_shift = bs }
+
+#define asiu_gate_val(o, es) { .offset = o, .en_shift = es }
+
+static void __init cygnus_armpll_init(struct device_node *node)
+{
+	iproc_armpll_setup(node);
+}
+CLK_OF_DECLARE(cygnus_armpll, "brcm,cygnus-armpll", cygnus_armpll_init);
+
+static const struct iproc_pll_ctrl genpll = {
+	.flags = IPROC_CLK_AON | IPROC_CLK_PLL_HAS_NDIV_FRAC,
+	.aon = aon_val(0x0, 2, 1, 0),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 3),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static void __init cygnus_genpll_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &genpll, NULL, 0);
+}
+CLK_OF_DECLARE(cygnus_genpll, "brcm,cygnus-genpll", cygnus_genpll_init);
+
+static const struct iproc_pll_ctrl lcpll0 = {
+	.flags = IPROC_CLK_AON,
+	.aon = aon_val(0x0, 2, 5, 4),
+	.reset = reset_val(0x0, 31, 30, 27, 3, 23, 4, 19, 4),
+	.ndiv_int = reg_val(0x4, 16, 10),
+	.pdiv = reg_val(0x4, 26, 4),
+	.vco_ctrl = vco_ctrl_val(0x10, 0x14),
+	.status = reg_val(0x18, 12, 1),
+};
+
+static void __init cygnus_lcpll0_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &lcpll0, NULL, 0);
+}
+CLK_OF_DECLARE(cygnus_lcpll0, "brcm,cygnus-lcpll0", cygnus_lcpll0_init);
+
+/*
+ * MIPI PLL VCO frequency parameter table
+ */
+static const struct iproc_pll_vco_freq_param mipipll_vco_params[] = {
+	/* rate (Hz) ndiv_int ndiv_frac pdiv */
+	{ 750000000UL,   30,     0,        1 },
+	{ 1000000000UL,  40,     0,        1 },
+	{ 1350000000ul,  54,     0,        1 },
+	{ 2000000000UL,  80,     0,        1 },
+	{ 2100000000UL,  84,     0,        1 },
+	{ 2250000000UL,  90,     0,        1 },
+	{ 2500000000UL,  100,    0,        1 },
+	{ 2700000000UL,  54,     0,        0 },
+	{ 2975000000UL,  119,    0,        1 },
+	{ 3100000000UL,  124,    0,        1 },
+	{ 3150000000UL,  126,    0,        1 },
+};
+
+static const struct iproc_pll_ctrl mipipll = {
+	.flags = IPROC_CLK_PLL_ASIU | IPROC_CLK_PLL_HAS_NDIV_FRAC,
+	.aon = aon_val(0x0, 4, 17, 16),
+	.asiu = asiu_gate_val(0x0, 3),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 4),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static void __init cygnus_mipipll_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &mipipll, mipipll_vco_params,
+			ARRAY_SIZE(mipipll_vco_params));
+}
+CLK_OF_DECLARE(cygnus_mipipll, "brcm,cygnus-mipipll", cygnus_mipipll_init);
+
+static const struct iproc_clk_ctrl genpll_clk[] = {
+	[BCM_CYGNUS_GENPLL_AXI21_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AXI21_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 6, 0, 12),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_250MHZ_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_250MHZ_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 7, 1, 13),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_IHOST_SYS_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_IHOST_SYS_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 8, 2, 14),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_GENPLL_ENET_SW_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_ENET_SW_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 9, 3, 15),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_AUDIO_125_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AUDIO_125_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 10, 4, 16),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_CAN_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_CAN_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 11, 5, 17),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static void __init cygnus_genpll_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, genpll_clk, ARRAY_SIZE(genpll_clk));
+}
+CLK_OF_DECLARE(cygnus_genpll_clk, "brcm,cygnus-genpll-clk",
+		cygnus_genpll_clk_init);
+
+static const struct iproc_clk_ctrl lcpll0_clk[] = {
+	[BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 7, 1, 13),
+		.mdiv = reg_val(0x8, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_DDR_PHY_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_DDR_PHY_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 8, 2, 14),
+		.mdiv = reg_val(0x8, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SDIO_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SDIO_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 9, 3, 15),
+		.mdiv = reg_val(0x8, 20, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 10, 4, 16),
+		.mdiv = reg_val(0xc, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SMART_CARD_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SMART_CARD_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 11, 5, 17),
+		.mdiv = reg_val(0xc, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_LCPLL0_CH5_UNUSED,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 12, 6, 18),
+		.mdiv = reg_val(0xc, 20, 8),
+	},
+};
+
+static void __init cygnus_lcpll0_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, lcpll0_clk, ARRAY_SIZE(lcpll0_clk));
+}
+CLK_OF_DECLARE(cygnus_lcpll0_clk, "brcm,cygnus-lcpll0-clk",
+		cygnus_lcpll0_clk_init);
+
+static const struct iproc_clk_ctrl mipipll_clk[] = {
+	[BCM_CYGNUS_MIPIPLL_CH0_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH0_UNUSED,
+		.enable = enable_val(0x4, 12, 6, 18),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH1_LCD] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH1_LCD,
+		.enable = enable_val(0x4, 13, 7, 19),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH2_V3D] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH2_V3D,
+		.enable = enable_val(0x4, 14, 8, 20),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH3_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH3_UNUSED,
+		.enable = enable_val(0x4, 15, 9, 21),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH4_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH4_UNUSED,
+		.enable = enable_val(0x4, 16, 10, 22),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH5_UNUSED,
+		.enable = enable_val(0x4, 17, 11, 23),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static void __init cygnus_mipipll_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, mipipll_clk, ARRAY_SIZE(mipipll_clk));
+}
+CLK_OF_DECLARE(cygnus_mipipll_clk, "brcm,cygnus-mipipll-clk",
+		cygnus_mipipll_clk_init);
+
+static const struct iproc_asiu_div asiu_div[] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
+		asiu_div_val(0x0, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_ADC_CLK] =
+		asiu_div_val(0x4, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_PWM_CLK] =
+		asiu_div_val(0x8, 31, 16, 10, 0, 10),
+};
+
+static const struct iproc_asiu_gate asiu_gate[] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
+		asiu_gate_val(0x0, 7),
+	[BCM_CYGNUS_ASIU_ADC_CLK] =
+		asiu_gate_val(0x0, 9),
+	[BCM_CYGNUS_ASIU_PWM_CLK] =
+		asiu_gate_val(IPROC_CLK_INVALID_OFFSET, 0),
+};
+
+static void __init cygnus_asiu_init(struct device_node *node)
+{
+	iproc_asiu_setup(node, asiu_div, asiu_gate, ARRAY_SIZE(asiu_div));
+}
+CLK_OF_DECLARE(cygnus_asiu_clk, "brcm,cygnus-asiu-clk", cygnus_asiu_init);
diff --git a/include/dt-bindings/clock/bcm-cygnus.h b/include/dt-bindings/clock/bcm-cygnus.h
new file mode 100644
index 0000000..9d30582
--- /dev/null
+++ b/include/dt-bindings/clock/bcm-cygnus.h
@@ -0,0 +1,65 @@
+/*
+ *  BSD LICENSE
+ *
+ *  Copyright(c) 2014 Broadcom Corporation.  All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in
+ *      the documentation and/or other materials provided with the
+ *      distribution.
+ *    * Neither the name of Broadcom Corporation nor the names of its
+ *      contributors may be used to endorse or promote products derived
+ *      from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _CLOCK_BCM_CYGNUS_H
+#define _CLOCK_BCM_CYGNUS_H
+
+/* GENPLL clock channel ID */
+#define BCM_CYGNUS_GENPLL_AXI21_CLK          0
+#define BCM_CYGNUS_GENPLL_250MHZ_CLK         1
+#define BCM_CYGNUS_GENPLL_IHOST_SYS_CLK      2
+#define BCM_CYGNUS_GENPLL_ENET_SW_CLK        3
+#define BCM_CYGNUS_GENPLL_AUDIO_125_CLK      4
+#define BCM_CYGNUS_GENPLL_CAN_CLK            5
+
+/* LCPLL0 clock channel ID */
+#define BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK    0
+#define BCM_CYGNUS_LCPLL0_DDR_PHY_CLK         1
+#define BCM_CYGNUS_LCPLL0_SDIO_CLK            2
+#define BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK     3
+#define BCM_CYGNUS_LCPLL0_SMART_CARD_CLK      4
+#define BCM_CYGNUS_LCPLL0_CH5_UNUSED          5
+
+/* MIPI PLL clock channel ID */
+#define BCM_CYGNUS_MIPIPLL_CH0_UNUSED         0
+#define BCM_CYGNUS_MIPIPLL_CH1_LCD            1
+#define BCM_CYGNUS_MIPIPLL_CH2_V3D            2
+#define BCM_CYGNUS_MIPIPLL_CH3_UNUSED         3
+#define BCM_CYGNUS_MIPIPLL_CH4_UNUSED         4
+#define BCM_CYGNUS_MIPIPLL_CH5_UNUSED         5
+
+/* ASIU clock IDs */
+#define BCM_CYGNUS_ASIU_KEYPAD_CLK    0
+#define BCM_CYGNUS_ASIU_ADC_CLK       1
+#define BCM_CYGNUS_ASIU_PWM_CLK       2
+
+#endif /* _CLOCK_BCM_CYGNUS_H */
-- 
1.7.9.5

[PATCH v5 5/6] clk: cygnus: add clock support for Broadcom Cygnus

[Ray Jui]

The Broadcom Cygnus SoC is architected under the iProc architecture. It
has the following PLLs: ARMPLL, GENPLL, LCPLL0, MIPIPLL, all dervied
from an onboard crystal. Cygnus also has various ASIU clocks that are
derived directly from the onboard crystal.

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/clk/bcm/Makefile               |    1 +
 drivers/clk/bcm/clk-cygnus.c           |  277 ++++++++++++++++++++++++++++++++
 include/dt-bindings/clock/bcm-cygnus.h |   65 ++++++++
 3 files changed, 343 insertions(+)
 create mode 100644 drivers/clk/bcm/clk-cygnus.c
 create mode 100644 include/dt-bindings/clock/bcm-cygnus.h

diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
index 6926636..afcbe55 100644
--- a/drivers/clk/bcm/Makefile
+++ b/drivers/clk/bcm/Makefile
@@ -3,3 +3,4 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
 obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
+obj-$(CONFIG_ARCH_BCM_CYGNUS)	+= clk-cygnus.o
diff --git a/drivers/clk/bcm/clk-cygnus.c b/drivers/clk/bcm/clk-cygnus.c
new file mode 100644
index 0000000..f1dbfd7
--- /dev/null
+++ b/drivers/clk/bcm/clk-cygnus.c
@@ -0,0 +1,277 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include <dt-bindings/clock/bcm-cygnus.h>
+#include "clk-iproc.h"
+
+#define reg_val(o, s, w) { .offset = o, .shift = s, .width = w, }
+
+#define aon_val(o, pw, ps, is) { .offset = o, .pwr_width = pw, \
+	.pwr_shift = ps, .iso_shift = is }
+
+#define asiu_div_val(o, es, hs, hw, ls, lw) \
+		{ .offset = o, .en_shift = es, .high_shift = hs, \
+		.high_width = hw, .low_shift = ls, .low_width = lw }
+
+#define reset_val(o, rs, prs, kis, kiw, kps, kpw, kas, kaw) { .offset = o, \
+	.reset_shift = rs, .p_reset_shift = prs, .ki_shift = kis, \
+	.ki_width = kiw, .kp_shift = kps, .kp_width = kpw, .ka_shift = kas, \
+	.ka_width = kaw }
+
+#define vco_ctrl_val(uo, lo) { .u_offset = uo, .l_offset = lo }
+
+#define enable_val(o, es, hs, bs) { .offset = o, .enable_shift = es, \
+	.hold_shift = hs, .bypass_shift = bs }
+
+#define asiu_gate_val(o, es) { .offset = o, .en_shift = es }
+
+static void __init cygnus_armpll_init(struct device_node *node)
+{
+	iproc_armpll_setup(node);
+}
+CLK_OF_DECLARE(cygnus_armpll, "brcm,cygnus-armpll", cygnus_armpll_init);
+
+static const struct iproc_pll_ctrl genpll = {
+	.flags = IPROC_CLK_AON | IPROC_CLK_PLL_HAS_NDIV_FRAC,
+	.aon = aon_val(0x0, 2, 1, 0),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 3),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static void __init cygnus_genpll_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &genpll, NULL, 0);
+}
+CLK_OF_DECLARE(cygnus_genpll, "brcm,cygnus-genpll", cygnus_genpll_init);
+
+static const struct iproc_pll_ctrl lcpll0 = {
+	.flags = IPROC_CLK_AON,
+	.aon = aon_val(0x0, 2, 5, 4),
+	.reset = reset_val(0x0, 31, 30, 27, 3, 23, 4, 19, 4),
+	.ndiv_int = reg_val(0x4, 16, 10),
+	.pdiv = reg_val(0x4, 26, 4),
+	.vco_ctrl = vco_ctrl_val(0x10, 0x14),
+	.status = reg_val(0x18, 12, 1),
+};
+
+static void __init cygnus_lcpll0_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &lcpll0, NULL, 0);
+}
+CLK_OF_DECLARE(cygnus_lcpll0, "brcm,cygnus-lcpll0", cygnus_lcpll0_init);
+
+/*
+ * MIPI PLL VCO frequency parameter table
+ */
+static const struct iproc_pll_vco_freq_param mipipll_vco_params[] = {
+	/* rate (Hz) ndiv_int ndiv_frac pdiv */
+	{ 750000000UL,   30,     0,        1 },
+	{ 1000000000UL,  40,     0,        1 },
+	{ 1350000000ul,  54,     0,        1 },
+	{ 2000000000UL,  80,     0,        1 },
+	{ 2100000000UL,  84,     0,        1 },
+	{ 2250000000UL,  90,     0,        1 },
+	{ 2500000000UL,  100,    0,        1 },
+	{ 2700000000UL,  54,     0,        0 },
+	{ 2975000000UL,  119,    0,        1 },
+	{ 3100000000UL,  124,    0,        1 },
+	{ 3150000000UL,  126,    0,        1 },
+};
+
+static const struct iproc_pll_ctrl mipipll = {
+	.flags = IPROC_CLK_PLL_ASIU | IPROC_CLK_PLL_HAS_NDIV_FRAC,
+	.aon = aon_val(0x0, 4, 17, 16),
+	.asiu = asiu_gate_val(0x0, 3),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 4),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static void __init cygnus_mipipll_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &mipipll, mipipll_vco_params,
+			ARRAY_SIZE(mipipll_vco_params));
+}
+CLK_OF_DECLARE(cygnus_mipipll, "brcm,cygnus-mipipll", cygnus_mipipll_init);
+
+static const struct iproc_clk_ctrl genpll_clk[] = {
+	[BCM_CYGNUS_GENPLL_AXI21_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AXI21_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 6, 0, 12),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_250MHZ_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_250MHZ_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 7, 1, 13),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_IHOST_SYS_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_IHOST_SYS_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 8, 2, 14),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_GENPLL_ENET_SW_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_ENET_SW_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 9, 3, 15),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_AUDIO_125_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AUDIO_125_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 10, 4, 16),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_CAN_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_CAN_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 11, 5, 17),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static void __init cygnus_genpll_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, genpll_clk, ARRAY_SIZE(genpll_clk));
+}
+CLK_OF_DECLARE(cygnus_genpll_clk, "brcm,cygnus-genpll-clk",
+		cygnus_genpll_clk_init);
+
+static const struct iproc_clk_ctrl lcpll0_clk[] = {
+	[BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 7, 1, 13),
+		.mdiv = reg_val(0x8, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_DDR_PHY_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_DDR_PHY_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 8, 2, 14),
+		.mdiv = reg_val(0x8, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SDIO_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SDIO_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 9, 3, 15),
+		.mdiv = reg_val(0x8, 20, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 10, 4, 16),
+		.mdiv = reg_val(0xc, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SMART_CARD_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SMART_CARD_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 11, 5, 17),
+		.mdiv = reg_val(0xc, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_LCPLL0_CH5_UNUSED,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 12, 6, 18),
+		.mdiv = reg_val(0xc, 20, 8),
+	},
+};
+
+static void __init cygnus_lcpll0_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, lcpll0_clk, ARRAY_SIZE(lcpll0_clk));
+}
+CLK_OF_DECLARE(cygnus_lcpll0_clk, "brcm,cygnus-lcpll0-clk",
+		cygnus_lcpll0_clk_init);
+
+static const struct iproc_clk_ctrl mipipll_clk[] = {
+	[BCM_CYGNUS_MIPIPLL_CH0_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH0_UNUSED,
+		.enable = enable_val(0x4, 12, 6, 18),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH1_LCD] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH1_LCD,
+		.enable = enable_val(0x4, 13, 7, 19),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH2_V3D] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH2_V3D,
+		.enable = enable_val(0x4, 14, 8, 20),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH3_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH3_UNUSED,
+		.enable = enable_val(0x4, 15, 9, 21),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH4_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH4_UNUSED,
+		.enable = enable_val(0x4, 16, 10, 22),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH5_UNUSED,
+		.enable = enable_val(0x4, 17, 11, 23),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static void __init cygnus_mipipll_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, mipipll_clk, ARRAY_SIZE(mipipll_clk));
+}
+CLK_OF_DECLARE(cygnus_mipipll_clk, "brcm,cygnus-mipipll-clk",
+		cygnus_mipipll_clk_init);
+
+static const struct iproc_asiu_div asiu_div[] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
+		asiu_div_val(0x0, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_ADC_CLK] =
+		asiu_div_val(0x4, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_PWM_CLK] =
+		asiu_div_val(0x8, 31, 16, 10, 0, 10),
+};
+
+static const struct iproc_asiu_gate asiu_gate[] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
+		asiu_gate_val(0x0, 7),
+	[BCM_CYGNUS_ASIU_ADC_CLK] =
+		asiu_gate_val(0x0, 9),
+	[BCM_CYGNUS_ASIU_PWM_CLK] =
+		asiu_gate_val(IPROC_CLK_INVALID_OFFSET, 0),
+};
+
+static void __init cygnus_asiu_init(struct device_node *node)
+{
+	iproc_asiu_setup(node, asiu_div, asiu_gate, ARRAY_SIZE(asiu_div));
+}
+CLK_OF_DECLARE(cygnus_asiu_clk, "brcm,cygnus-asiu-clk", cygnus_asiu_init);
diff --git a/include/dt-bindings/clock/bcm-cygnus.h b/include/dt-bindings/clock/bcm-cygnus.h
new file mode 100644
index 0000000..9d30582
--- /dev/null
+++ b/include/dt-bindings/clock/bcm-cygnus.h
@@ -0,0 +1,65 @@
+/*
+ *  BSD LICENSE
+ *
+ *  Copyright(c) 2014 Broadcom Corporation.  All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in
+ *      the documentation and/or other materials provided with the
+ *      distribution.
+ *    * Neither the name of Broadcom Corporation nor the names of its
+ *      contributors may be used to endorse or promote products derived
+ *      from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _CLOCK_BCM_CYGNUS_H
+#define _CLOCK_BCM_CYGNUS_H
+
+/* GENPLL clock channel ID */
+#define BCM_CYGNUS_GENPLL_AXI21_CLK          0
+#define BCM_CYGNUS_GENPLL_250MHZ_CLK         1
+#define BCM_CYGNUS_GENPLL_IHOST_SYS_CLK      2
+#define BCM_CYGNUS_GENPLL_ENET_SW_CLK        3
+#define BCM_CYGNUS_GENPLL_AUDIO_125_CLK      4
+#define BCM_CYGNUS_GENPLL_CAN_CLK            5
+
+/* LCPLL0 clock channel ID */
+#define BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK    0
+#define BCM_CYGNUS_LCPLL0_DDR_PHY_CLK         1
+#define BCM_CYGNUS_LCPLL0_SDIO_CLK            2
+#define BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK     3
+#define BCM_CYGNUS_LCPLL0_SMART_CARD_CLK      4
+#define BCM_CYGNUS_LCPLL0_CH5_UNUSED          5
+
+/* MIPI PLL clock channel ID */
+#define BCM_CYGNUS_MIPIPLL_CH0_UNUSED         0
+#define BCM_CYGNUS_MIPIPLL_CH1_LCD            1
+#define BCM_CYGNUS_MIPIPLL_CH2_V3D            2
+#define BCM_CYGNUS_MIPIPLL_CH3_UNUSED         3
+#define BCM_CYGNUS_MIPIPLL_CH4_UNUSED         4
+#define BCM_CYGNUS_MIPIPLL_CH5_UNUSED         5
+
+/* ASIU clock IDs */
+#define BCM_CYGNUS_ASIU_KEYPAD_CLK    0
+#define BCM_CYGNUS_ASIU_ADC_CLK       1
+#define BCM_CYGNUS_ASIU_PWM_CLK       2
+
+#endif /* _CLOCK_BCM_CYGNUS_H */
-- 
1.7.9.5

[PATCH v5 5/6] clk: cygnus: add clock support for Broadcom Cygnus

[Ray Jui]

The Broadcom Cygnus SoC is architected under the iProc architecture. It
has the following PLLs: ARMPLL, GENPLL, LCPLL0, MIPIPLL, all dervied
from an onboard crystal. Cygnus also has various ASIU clocks that are
derived directly from the onboard crystal.

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/clk/bcm/Makefile               |    1 +
 drivers/clk/bcm/clk-cygnus.c           |  277 ++++++++++++++++++++++++++++++++
 include/dt-bindings/clock/bcm-cygnus.h |   65 ++++++++
 3 files changed, 343 insertions(+)
 create mode 100644 drivers/clk/bcm/clk-cygnus.c
 create mode 100644 include/dt-bindings/clock/bcm-cygnus.h

diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
index 6926636..afcbe55 100644
--- a/drivers/clk/bcm/Makefile
+++ b/drivers/clk/bcm/Makefile
@@ -3,3 +3,4 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
 obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-clk.o clk-iproc-asiu.o
+obj-$(CONFIG_ARCH_BCM_CYGNUS)	+= clk-cygnus.o
diff --git a/drivers/clk/bcm/clk-cygnus.c b/drivers/clk/bcm/clk-cygnus.c
new file mode 100644
index 0000000..f1dbfd7
--- /dev/null
+++ b/drivers/clk/bcm/clk-cygnus.c
@@ -0,0 +1,277 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include <dt-bindings/clock/bcm-cygnus.h>
+#include "clk-iproc.h"
+
+#define reg_val(o, s, w) { .offset = o, .shift = s, .width = w, }
+
+#define aon_val(o, pw, ps, is) { .offset = o, .pwr_width = pw, \
+	.pwr_shift = ps, .iso_shift = is }
+
+#define asiu_div_val(o, es, hs, hw, ls, lw) \
+		{ .offset = o, .en_shift = es, .high_shift = hs, \
+		.high_width = hw, .low_shift = ls, .low_width = lw }
+
+#define reset_val(o, rs, prs, kis, kiw, kps, kpw, kas, kaw) { .offset = o, \
+	.reset_shift = rs, .p_reset_shift = prs, .ki_shift = kis, \
+	.ki_width = kiw, .kp_shift = kps, .kp_width = kpw, .ka_shift = kas, \
+	.ka_width = kaw }
+
+#define vco_ctrl_val(uo, lo) { .u_offset = uo, .l_offset = lo }
+
+#define enable_val(o, es, hs, bs) { .offset = o, .enable_shift = es, \
+	.hold_shift = hs, .bypass_shift = bs }
+
+#define asiu_gate_val(o, es) { .offset = o, .en_shift = es }
+
+static void __init cygnus_armpll_init(struct device_node *node)
+{
+	iproc_armpll_setup(node);
+}
+CLK_OF_DECLARE(cygnus_armpll, "brcm,cygnus-armpll", cygnus_armpll_init);
+
+static const struct iproc_pll_ctrl genpll = {
+	.flags = IPROC_CLK_AON | IPROC_CLK_PLL_HAS_NDIV_FRAC,
+	.aon = aon_val(0x0, 2, 1, 0),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 3),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static void __init cygnus_genpll_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &genpll, NULL, 0);
+}
+CLK_OF_DECLARE(cygnus_genpll, "brcm,cygnus-genpll", cygnus_genpll_init);
+
+static const struct iproc_pll_ctrl lcpll0 = {
+	.flags = IPROC_CLK_AON,
+	.aon = aon_val(0x0, 2, 5, 4),
+	.reset = reset_val(0x0, 31, 30, 27, 3, 23, 4, 19, 4),
+	.ndiv_int = reg_val(0x4, 16, 10),
+	.pdiv = reg_val(0x4, 26, 4),
+	.vco_ctrl = vco_ctrl_val(0x10, 0x14),
+	.status = reg_val(0x18, 12, 1),
+};
+
+static void __init cygnus_lcpll0_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &lcpll0, NULL, 0);
+}
+CLK_OF_DECLARE(cygnus_lcpll0, "brcm,cygnus-lcpll0", cygnus_lcpll0_init);
+
+/*
+ * MIPI PLL VCO frequency parameter table
+ */
+static const struct iproc_pll_vco_freq_param mipipll_vco_params[] = {
+	/* rate (Hz) ndiv_int ndiv_frac pdiv */
+	{ 750000000UL,   30,     0,        1 },
+	{ 1000000000UL,  40,     0,        1 },
+	{ 1350000000ul,  54,     0,        1 },
+	{ 2000000000UL,  80,     0,        1 },
+	{ 2100000000UL,  84,     0,        1 },
+	{ 2250000000UL,  90,     0,        1 },
+	{ 2500000000UL,  100,    0,        1 },
+	{ 2700000000UL,  54,     0,        0 },
+	{ 2975000000UL,  119,    0,        1 },
+	{ 3100000000UL,  124,    0,        1 },
+	{ 3150000000UL,  126,    0,        1 },
+};
+
+static const struct iproc_pll_ctrl mipipll = {
+	.flags = IPROC_CLK_PLL_ASIU | IPROC_CLK_PLL_HAS_NDIV_FRAC,
+	.aon = aon_val(0x0, 4, 17, 16),
+	.asiu = asiu_gate_val(0x0, 3),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 4),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static void __init cygnus_mipipll_init(struct device_node *node)
+{
+	iproc_pll_setup(node, &mipipll, mipipll_vco_params,
+			ARRAY_SIZE(mipipll_vco_params));
+}
+CLK_OF_DECLARE(cygnus_mipipll, "brcm,cygnus-mipipll", cygnus_mipipll_init);
+
+static const struct iproc_clk_ctrl genpll_clk[] = {
+	[BCM_CYGNUS_GENPLL_AXI21_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AXI21_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 6, 0, 12),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_250MHZ_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_250MHZ_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 7, 1, 13),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_IHOST_SYS_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_IHOST_SYS_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 8, 2, 14),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_GENPLL_ENET_SW_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_ENET_SW_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 9, 3, 15),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_AUDIO_125_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AUDIO_125_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 10, 4, 16),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_CAN_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_CAN_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 11, 5, 17),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static void __init cygnus_genpll_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, genpll_clk, ARRAY_SIZE(genpll_clk));
+}
+CLK_OF_DECLARE(cygnus_genpll_clk, "brcm,cygnus-genpll-clk",
+		cygnus_genpll_clk_init);
+
+static const struct iproc_clk_ctrl lcpll0_clk[] = {
+	[BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 7, 1, 13),
+		.mdiv = reg_val(0x8, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_DDR_PHY_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_DDR_PHY_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 8, 2, 14),
+		.mdiv = reg_val(0x8, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SDIO_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SDIO_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 9, 3, 15),
+		.mdiv = reg_val(0x8, 20, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 10, 4, 16),
+		.mdiv = reg_val(0xc, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SMART_CARD_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SMART_CARD_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 11, 5, 17),
+		.mdiv = reg_val(0xc, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_LCPLL0_CH5_UNUSED,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 12, 6, 18),
+		.mdiv = reg_val(0xc, 20, 8),
+	},
+};
+
+static void __init cygnus_lcpll0_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, lcpll0_clk, ARRAY_SIZE(lcpll0_clk));
+}
+CLK_OF_DECLARE(cygnus_lcpll0_clk, "brcm,cygnus-lcpll0-clk",
+		cygnus_lcpll0_clk_init);
+
+static const struct iproc_clk_ctrl mipipll_clk[] = {
+	[BCM_CYGNUS_MIPIPLL_CH0_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH0_UNUSED,
+		.enable = enable_val(0x4, 12, 6, 18),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH1_LCD] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH1_LCD,
+		.enable = enable_val(0x4, 13, 7, 19),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH2_V3D] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH2_V3D,
+		.enable = enable_val(0x4, 14, 8, 20),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH3_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH3_UNUSED,
+		.enable = enable_val(0x4, 15, 9, 21),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH4_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH4_UNUSED,
+		.enable = enable_val(0x4, 16, 10, 22),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH5_UNUSED,
+		.enable = enable_val(0x4, 17, 11, 23),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static void __init cygnus_mipipll_clk_init(struct device_node *node)
+{
+	iproc_clk_setup(node, mipipll_clk, ARRAY_SIZE(mipipll_clk));
+}
+CLK_OF_DECLARE(cygnus_mipipll_clk, "brcm,cygnus-mipipll-clk",
+		cygnus_mipipll_clk_init);
+
+static const struct iproc_asiu_div asiu_div[] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
+		asiu_div_val(0x0, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_ADC_CLK] =
+		asiu_div_val(0x4, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_PWM_CLK] =
+		asiu_div_val(0x8, 31, 16, 10, 0, 10),
+};
+
+static const struct iproc_asiu_gate asiu_gate[] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
+		asiu_gate_val(0x0, 7),
+	[BCM_CYGNUS_ASIU_ADC_CLK] =
+		asiu_gate_val(0x0, 9),
+	[BCM_CYGNUS_ASIU_PWM_CLK] =
+		asiu_gate_val(IPROC_CLK_INVALID_OFFSET, 0),
+};
+
+static void __init cygnus_asiu_init(struct device_node *node)
+{
+	iproc_asiu_setup(node, asiu_div, asiu_gate, ARRAY_SIZE(asiu_div));
+}
+CLK_OF_DECLARE(cygnus_asiu_clk, "brcm,cygnus-asiu-clk", cygnus_asiu_init);
diff --git a/include/dt-bindings/clock/bcm-cygnus.h b/include/dt-bindings/clock/bcm-cygnus.h
new file mode 100644
index 0000000..9d30582
--- /dev/null
+++ b/include/dt-bindings/clock/bcm-cygnus.h
@@ -0,0 +1,65 @@
+/*
+ *  BSD LICENSE
+ *
+ *  Copyright(c) 2014 Broadcom Corporation.  All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in
+ *      the documentation and/or other materials provided with the
+ *      distribution.
+ *    * Neither the name of Broadcom Corporation nor the names of its
+ *      contributors may be used to endorse or promote products derived
+ *      from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _CLOCK_BCM_CYGNUS_H
+#define _CLOCK_BCM_CYGNUS_H
+
+/* GENPLL clock channel ID */
+#define BCM_CYGNUS_GENPLL_AXI21_CLK          0
+#define BCM_CYGNUS_GENPLL_250MHZ_CLK         1
+#define BCM_CYGNUS_GENPLL_IHOST_SYS_CLK      2
+#define BCM_CYGNUS_GENPLL_ENET_SW_CLK        3
+#define BCM_CYGNUS_GENPLL_AUDIO_125_CLK      4
+#define BCM_CYGNUS_GENPLL_CAN_CLK            5
+
+/* LCPLL0 clock channel ID */
+#define BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK    0
+#define BCM_CYGNUS_LCPLL0_DDR_PHY_CLK         1
+#define BCM_CYGNUS_LCPLL0_SDIO_CLK            2
+#define BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK     3
+#define BCM_CYGNUS_LCPLL0_SMART_CARD_CLK      4
+#define BCM_CYGNUS_LCPLL0_CH5_UNUSED          5
+
+/* MIPI PLL clock channel ID */
+#define BCM_CYGNUS_MIPIPLL_CH0_UNUSED         0
+#define BCM_CYGNUS_MIPIPLL_CH1_LCD            1
+#define BCM_CYGNUS_MIPIPLL_CH2_V3D            2
+#define BCM_CYGNUS_MIPIPLL_CH3_UNUSED         3
+#define BCM_CYGNUS_MIPIPLL_CH4_UNUSED         4
+#define BCM_CYGNUS_MIPIPLL_CH5_UNUSED         5
+
+/* ASIU clock IDs */
+#define BCM_CYGNUS_ASIU_KEYPAD_CLK    0
+#define BCM_CYGNUS_ASIU_ADC_CLK       1
+#define BCM_CYGNUS_ASIU_PWM_CLK       2
+
+#endif /* _CLOCK_BCM_CYGNUS_H */
-- 
1.7.9.5

[PATCH v5 6/6] ARM: dts: enable clock support for Broadcom Cygnus

[Ray Jui]

Replace current device tree dummy clocks with real clock support for
Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbraden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus-clock.dtsi |  110 ++++++++++++++++++++++++-------
 arch/arm/boot/dts/bcm-cygnus.dtsi       |    2 +-
 2 files changed, 86 insertions(+), 26 deletions(-)

diff --git a/arch/arm/boot/dts/bcm-cygnus-clock.dtsi b/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
index 60d8389..abb8a3f 100644
--- a/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
@@ -36,56 +36,116 @@ clocks {
 	ranges;
 
 	osc: oscillator {
+		#clock-cells = <0>;
 		compatible = "fixed-clock";
-		#clock-cells = <1>;
 		clock-frequency = <25000000>;
 	};
 
-	apb_clk: apb_clk {
-		compatible = "fixed-clock";
+	/* Cygnus ARM PLL */
+	armpll: armpll {
 		#clock-cells = <0>;
-		clock-frequency = <1000000000>;
+		compatible = "brcm,cygnus-armpll";
+		clocks = <&osc>;
+		reg = <0x19000000 0x1000>;
 	};
 
-	periph_clk: periph_clk {
-		compatible = "fixed-clock";
+	/* peripheral clock for system timer */
+	arm_periph_clk: arm_periph_clk {
 		#clock-cells = <0>;
-		clock-frequency = <500000000>;
+		compatible = "fixed-factor-clock";
+		clocks = <&armpll>;
+		clock-div = <2>;
+		clock-mult = <1>;
 	};
 
-	sdio_clk: lcpll_ch2 {
-		compatible = "fixed-clock";
+	/* APB bus clock */
+	apb_clk: apb_clk {
 		#clock-cells = <0>;
-		clock-frequency = <200000000>;
+		compatible = "fixed-factor-clock";
+		clocks = <&armpll>;
+		clock-div = <4>;
+		clock-mult = <1>;
 	};
 
-	axi81_clk: axi81_clk {
-		compatible = "fixed-clock";
+	genpll: genpll {
 		#clock-cells = <0>;
-		clock-frequency = <100000000>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
 	};
 
-	keypad_clk: keypad_clk {
-		compatible = "fixed-clock";
+	/* various clocks running off the GENPLL */
+	genpll_clks: genpll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-genpll-clk";
+		reg = <0x0301d000 0x2c>;
+		clocks = <&genpll>;
+		clock-output-names = "axi21", "250mhz", "ihost_sys",
+			"enet_sw", "audio_125", "can";
+	};
+
+	/* always 1/2 of the axi21 clock */
+	axi41_clk: axi41_clk {
 		#clock-cells = <0>;
-		clock-frequency = <31806>;
+		compatible = "fixed-factor-clock";
+		clocks = <&genpll_clks 0>;
+		clock-div = <2>;
+		clock-mult = <1>;
 	};
 
-	adc_clk: adc_clk {
-		compatible = "fixed-clock";
+	/* always 1/4 of the axi21 clock */
+	axi81_clk: axi81_clk {
 		#clock-cells = <0>;
-		clock-frequency = <1562500>;
+		compatible = "fixed-factor-clock";
+		clocks = <&genpll_clks 0>;
+		clock-div = <4>;
+		clock-mult = <1>;
 	};
 
-	pwm_clk: pwm_clk {
-		compatible = "fixed-clock";
+	lcpll0: lcpll0 {
 		#clock-cells = <0>;
-		clock-frequency = <1000000>;
+		compatible = "brcm,cygnus-lcpll0";
+		reg = <0x0301d02c 0x1c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
 	};
 
-	lcd_clk: mipipll_ch1 {
-		compatible = "fixed-clock";
+	/* various clocks running off the LCPLL0 */
+	lcpll0_clks: lcpll0_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-lcpll0-clk";
+		reg = <0x0301d02c 0x1c>;
+		clocks = <&lcpll0>;
+		clock-output-names = "pcie_phy", "ddr_phy", "sdio",
+			"usb_phy", "smart_card", "ch5";
+	};
+
+	mipipll: mipipll {
 		#clock-cells = <0>;
-		clock-frequency = <100000000>;
+		compatible = "brcm,cygnus-mipipll";
+		reg = <0x180a9800 0x2c>,
+			<0x0301c020 0x4>,
+			<0x180aa024 0x4>;
+		clock-frequency = <2100000000>;
+		clocks = <&osc>;
+	};
+
+	mipipll_clks: mipipll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-mipipll-clk";
+		reg = <0x180a9800 0x2c>;
+		clocks = <&mipipll>;
+		clock-output-names = "ch0_unused", "ch1_lcd", "ch2_unused",
+			"ch3_unused", "ch4_unused", "ch5_unused";
+	};
+
+	asiu_clks: asiu_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-asiu-clk";
+		reg = <0x0301d048 0xc>,
+			<0x180aa024 0x4>;
+		clocks = <&osc>;
+		clock-output-names = "keypad", "adc/touch", "pwm";
 	};
 };
diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..2b99e9c 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -134,7 +134,7 @@
 		compatible = "arm,cortex-a9-global-timer";
 		reg = <0x19020200 0x100>;
 		interrupts = <GIC_PPI 11 IRQ_TYPE_LEVEL_HIGH>;
-		clocks = <&periph_clk>;
+		clocks = <&arm_periph_clk>;
 	};
 
 };
-- 
1.7.9.5

[PATCH v5 6/6] ARM: dts: enable clock support for Broadcom Cygnus

[Ray Jui]

Replace current device tree dummy clocks with real clock support for
Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbraden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus-clock.dtsi |  110 ++++++++++++++++++++++++-------
 arch/arm/boot/dts/bcm-cygnus.dtsi       |    2 +-
 2 files changed, 86 insertions(+), 26 deletions(-)

diff --git a/arch/arm/boot/dts/bcm-cygnus-clock.dtsi b/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
index 60d8389..abb8a3f 100644
--- a/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
@@ -36,56 +36,116 @@ clocks {
 	ranges;
 
 	osc: oscillator {
+		#clock-cells = <0>;
 		compatible = "fixed-clock";
-		#clock-cells = <1>;
 		clock-frequency = <25000000>;
 	};
 
-	apb_clk: apb_clk {
-		compatible = "fixed-clock";
+	/* Cygnus ARM PLL */
+	armpll: armpll {
 		#clock-cells = <0>;
-		clock-frequency = <1000000000>;
+		compatible = "brcm,cygnus-armpll";
+		clocks = <&osc>;
+		reg = <0x19000000 0x1000>;
 	};
 
-	periph_clk: periph_clk {
-		compatible = "fixed-clock";
+	/* peripheral clock for system timer */
+	arm_periph_clk: arm_periph_clk {
 		#clock-cells = <0>;
-		clock-frequency = <500000000>;
+		compatible = "fixed-factor-clock";
+		clocks = <&armpll>;
+		clock-div = <2>;
+		clock-mult = <1>;
 	};
 
-	sdio_clk: lcpll_ch2 {
-		compatible = "fixed-clock";
+	/* APB bus clock */
+	apb_clk: apb_clk {
 		#clock-cells = <0>;
-		clock-frequency = <200000000>;
+		compatible = "fixed-factor-clock";
+		clocks = <&armpll>;
+		clock-div = <4>;
+		clock-mult = <1>;
 	};
 
-	axi81_clk: axi81_clk {
-		compatible = "fixed-clock";
+	genpll: genpll {
 		#clock-cells = <0>;
-		clock-frequency = <100000000>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
 	};
 
-	keypad_clk: keypad_clk {
-		compatible = "fixed-clock";
+	/* various clocks running off the GENPLL */
+	genpll_clks: genpll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-genpll-clk";
+		reg = <0x0301d000 0x2c>;
+		clocks = <&genpll>;
+		clock-output-names = "axi21", "250mhz", "ihost_sys",
+			"enet_sw", "audio_125", "can";
+	};
+
+	/* always 1/2 of the axi21 clock */
+	axi41_clk: axi41_clk {
 		#clock-cells = <0>;
-		clock-frequency = <31806>;
+		compatible = "fixed-factor-clock";
+		clocks = <&genpll_clks 0>;
+		clock-div = <2>;
+		clock-mult = <1>;
 	};
 
-	adc_clk: adc_clk {
-		compatible = "fixed-clock";
+	/* always 1/4 of the axi21 clock */
+	axi81_clk: axi81_clk {
 		#clock-cells = <0>;
-		clock-frequency = <1562500>;
+		compatible = "fixed-factor-clock";
+		clocks = <&genpll_clks 0>;
+		clock-div = <4>;
+		clock-mult = <1>;
 	};
 
-	pwm_clk: pwm_clk {
-		compatible = "fixed-clock";
+	lcpll0: lcpll0 {
 		#clock-cells = <0>;
-		clock-frequency = <1000000>;
+		compatible = "brcm,cygnus-lcpll0";
+		reg = <0x0301d02c 0x1c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
 	};
 
-	lcd_clk: mipipll_ch1 {
-		compatible = "fixed-clock";
+	/* various clocks running off the LCPLL0 */
+	lcpll0_clks: lcpll0_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-lcpll0-clk";
+		reg = <0x0301d02c 0x1c>;
+		clocks = <&lcpll0>;
+		clock-output-names = "pcie_phy", "ddr_phy", "sdio",
+			"usb_phy", "smart_card", "ch5";
+	};
+
+	mipipll: mipipll {
 		#clock-cells = <0>;
-		clock-frequency = <100000000>;
+		compatible = "brcm,cygnus-mipipll";
+		reg = <0x180a9800 0x2c>,
+			<0x0301c020 0x4>,
+			<0x180aa024 0x4>;
+		clock-frequency = <2100000000>;
+		clocks = <&osc>;
+	};
+
+	mipipll_clks: mipipll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-mipipll-clk";
+		reg = <0x180a9800 0x2c>;
+		clocks = <&mipipll>;
+		clock-output-names = "ch0_unused", "ch1_lcd", "ch2_unused",
+			"ch3_unused", "ch4_unused", "ch5_unused";
+	};
+
+	asiu_clks: asiu_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-asiu-clk";
+		reg = <0x0301d048 0xc>,
+			<0x180aa024 0x4>;
+		clocks = <&osc>;
+		clock-output-names = "keypad", "adc/touch", "pwm";
 	};
 };
diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..2b99e9c 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -134,7 +134,7 @@
 		compatible = "arm,cortex-a9-global-timer";
 		reg = <0x19020200 0x100>;
 		interrupts = <GIC_PPI 11 IRQ_TYPE_LEVEL_HIGH>;
-		clocks = <&periph_clk>;
+		clocks = <&arm_periph_clk>;
 	};
 
 };
-- 
1.7.9.5

[PATCH v5 6/6] ARM: dts: enable clock support for Broadcom Cygnus

[Ray Jui]

Replace current device tree dummy clocks with real clock support for
Broadcom Cygnus SoC

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbraden@broadcom.com>
---
 arch/arm/boot/dts/bcm-cygnus-clock.dtsi |  110 ++++++++++++++++++++++++-------
 arch/arm/boot/dts/bcm-cygnus.dtsi       |    2 +-
 2 files changed, 86 insertions(+), 26 deletions(-)

diff --git a/arch/arm/boot/dts/bcm-cygnus-clock.dtsi b/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
index 60d8389..abb8a3f 100644
--- a/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus-clock.dtsi
@@ -36,56 +36,116 @@ clocks {
 	ranges;
 
 	osc: oscillator {
+		#clock-cells = <0>;
 		compatible = "fixed-clock";
-		#clock-cells = <1>;
 		clock-frequency = <25000000>;
 	};
 
-	apb_clk: apb_clk {
-		compatible = "fixed-clock";
+	/* Cygnus ARM PLL */
+	armpll: armpll {
 		#clock-cells = <0>;
-		clock-frequency = <1000000000>;
+		compatible = "brcm,cygnus-armpll";
+		clocks = <&osc>;
+		reg = <0x19000000 0x1000>;
 	};
 
-	periph_clk: periph_clk {
-		compatible = "fixed-clock";
+	/* peripheral clock for system timer */
+	arm_periph_clk: arm_periph_clk {
 		#clock-cells = <0>;
-		clock-frequency = <500000000>;
+		compatible = "fixed-factor-clock";
+		clocks = <&armpll>;
+		clock-div = <2>;
+		clock-mult = <1>;
 	};
 
-	sdio_clk: lcpll_ch2 {
-		compatible = "fixed-clock";
+	/* APB bus clock */
+	apb_clk: apb_clk {
 		#clock-cells = <0>;
-		clock-frequency = <200000000>;
+		compatible = "fixed-factor-clock";
+		clocks = <&armpll>;
+		clock-div = <4>;
+		clock-mult = <1>;
 	};
 
-	axi81_clk: axi81_clk {
-		compatible = "fixed-clock";
+	genpll: genpll {
 		#clock-cells = <0>;
-		clock-frequency = <100000000>;
+		compatible = "brcm,cygnus-genpll";
+		reg = <0x0301d000 0x2c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
 	};
 
-	keypad_clk: keypad_clk {
-		compatible = "fixed-clock";
+	/* various clocks running off the GENPLL */
+	genpll_clks: genpll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-genpll-clk";
+		reg = <0x0301d000 0x2c>;
+		clocks = <&genpll>;
+		clock-output-names = "axi21", "250mhz", "ihost_sys",
+			"enet_sw", "audio_125", "can";
+	};
+
+	/* always 1/2 of the axi21 clock */
+	axi41_clk: axi41_clk {
 		#clock-cells = <0>;
-		clock-frequency = <31806>;
+		compatible = "fixed-factor-clock";
+		clocks = <&genpll_clks 0>;
+		clock-div = <2>;
+		clock-mult = <1>;
 	};
 
-	adc_clk: adc_clk {
-		compatible = "fixed-clock";
+	/* always 1/4 of the axi21 clock */
+	axi81_clk: axi81_clk {
 		#clock-cells = <0>;
-		clock-frequency = <1562500>;
+		compatible = "fixed-factor-clock";
+		clocks = <&genpll_clks 0>;
+		clock-div = <4>;
+		clock-mult = <1>;
 	};
 
-	pwm_clk: pwm_clk {
-		compatible = "fixed-clock";
+	lcpll0: lcpll0 {
 		#clock-cells = <0>;
-		clock-frequency = <1000000>;
+		compatible = "brcm,cygnus-lcpll0";
+		reg = <0x0301d02c 0x1c>,
+			<0x0301c020 0x4>;
+		clocks = <&osc>;
 	};
 
-	lcd_clk: mipipll_ch1 {
-		compatible = "fixed-clock";
+	/* various clocks running off the LCPLL0 */
+	lcpll0_clks: lcpll0_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-lcpll0-clk";
+		reg = <0x0301d02c 0x1c>;
+		clocks = <&lcpll0>;
+		clock-output-names = "pcie_phy", "ddr_phy", "sdio",
+			"usb_phy", "smart_card", "ch5";
+	};
+
+	mipipll: mipipll {
 		#clock-cells = <0>;
-		clock-frequency = <100000000>;
+		compatible = "brcm,cygnus-mipipll";
+		reg = <0x180a9800 0x2c>,
+			<0x0301c020 0x4>,
+			<0x180aa024 0x4>;
+		clock-frequency = <2100000000>;
+		clocks = <&osc>;
+	};
+
+	mipipll_clks: mipipll_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-mipipll-clk";
+		reg = <0x180a9800 0x2c>;
+		clocks = <&mipipll>;
+		clock-output-names = "ch0_unused", "ch1_lcd", "ch2_unused",
+			"ch3_unused", "ch4_unused", "ch5_unused";
+	};
+
+	asiu_clks: asiu_clks {
+		#clock-cells = <1>;
+		compatible = "brcm,cygnus-asiu-clk";
+		reg = <0x0301d048 0xc>,
+			<0x180aa024 0x4>;
+		clocks = <&osc>;
+		clock-output-names = "keypad", "adc/touch", "pwm";
 	};
 };
diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..2b99e9c 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -134,7 +134,7 @@
 		compatible = "arm,cortex-a9-global-timer";
 		reg = <0x19020200 0x100>;
 		interrupts = <GIC_PPI 11 IRQ_TYPE_LEVEL_HIGH>;
-		clocks = <&periph_clk>;
+		clocks = <&arm_periph_clk>;
 	};
 
 };
-- 
1.7.9.5

Re: [v7,2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Kevin Cernekee]

On Mon, Jan 19, 2015 at 01:51:49PM -0800, Ray Jui wrote:
> Add initial support to the Broadcom iProc I2C controller found in the
> iProc family of SoCs.
> 
> The iProc I2C controller has separate internal TX and RX FIFOs, each has
> a size of 64 bytes. The iProc I2C controller supports two bus speeds
> including standard mode (100kHz) and fast mode (400kHz)
> 
> Signed-off-by: Ray Jui <rjui <at> broadcom.com>
> Reviewed-by: Scott Branden <sbranden <at> broadcom.com>
> ---
>  drivers/i2c/busses/Kconfig         |   10 +
>  drivers/i2c/busses/Makefile        |    1 +
>  drivers/i2c/busses/i2c-bcm-iproc.c |  505 ++++++++++++++++++++++++++++++++++++
>  3 files changed, 516 insertions(+)
>  create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c
> 
> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
> index 31e8308..af76d23 100644
> --- a/drivers/i2c/busses/Kconfig
> +++ b/drivers/i2c/busses/Kconfig
>  <at>  <at>  -372,6 +372,16  <at>  <at>  config I2C_BCM2835
>  	  This support is also available as a module.  If so, the module
>  	  will be called i2c-bcm2835.
> 
> +config I2C_BCM_IPROC
> +	tristate "Broadcom iProc I2C controller"
> +	depends on ARCH_BCM_IPROC || COMPILE_TEST
> +	default ARCH_BCM_IPROC
> +	help
> +	  If you say yes to this option, support will be included for the
> +	  Broadcom iProc I2C controller.
> +
> +	  If you don't know what to do here, say N.
> +
>  config I2C_BCM_KONA
>  	tristate "BCM Kona I2C adapter"
>  	depends on ARCH_BCM_MOBILE
> diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
> index 56388f6..d93b509 100644
> --- a/drivers/i2c/busses/Makefile
> +++ b/drivers/i2c/busses/Makefile
>  <at>  <at>  -33,6 +33,7  <at>  <at>  obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
>  obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
>  obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
>  obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
> +obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
>  obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
>  obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
>  obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
> diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
> new file mode 100644
> index 0000000..64c622f
> --- /dev/null
> +++ b/drivers/i2c/busses/i2c-bcm-iproc.c
>  <at>  <at>  -0,0 +1,505  <at>  <at> 
> +/*
> + * Copyright (C) 2014 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/i2c.h>
> +#include <linux/interrupt.h>
> +#include <linux/platform_device.h>
> +#include <linux/io.h>
> +#include <linux/slab.h>
> +#include <linux/delay.h>
> +
> +#define CFG_OFFSET                   0x00
> +#define CFG_RESET_SHIFT              31
> +#define CFG_EN_SHIFT                 30
> +#define CFG_M_RETRY_CNT_SHIFT        16
> +#define CFG_M_RETRY_CNT_MASK         0x0f
> +
> +#define TIM_CFG_OFFSET               0x04
> +#define TIM_CFG_MODE_400_SHIFT       31
> +
> +#define M_FIFO_CTRL_OFFSET           0x0c
> +#define M_FIFO_RX_FLUSH_SHIFT        31
> +#define M_FIFO_TX_FLUSH_SHIFT        30
> +#define M_FIFO_RX_CNT_SHIFT          16
> +#define M_FIFO_RX_CNT_MASK           0x7f
> +#define M_FIFO_RX_THLD_SHIFT         8
> +#define M_FIFO_RX_THLD_MASK          0x3f
> +
> +#define M_CMD_OFFSET                 0x30
> +#define M_CMD_START_BUSY_SHIFT       31
> +#define M_CMD_STATUS_SHIFT           25
> +#define M_CMD_STATUS_MASK            0x07
> +#define M_CMD_STATUS_SUCCESS         0x0
> +#define M_CMD_STATUS_LOST_ARB        0x1
> +#define M_CMD_STATUS_NACK_ADDR       0x2
> +#define M_CMD_STATUS_NACK_DATA       0x3
> +#define M_CMD_STATUS_TIMEOUT         0x4
> +#define M_CMD_PROTOCOL_SHIFT         9
> +#define M_CMD_PROTOCOL_MASK          0xf
> +#define M_CMD_PROTOCOL_BLK_WR        0x7
> +#define M_CMD_PROTOCOL_BLK_RD        0x8
> +#define M_CMD_PEC_SHIFT              8
> +#define M_CMD_RD_CNT_SHIFT           0
> +#define M_CMD_RD_CNT_MASK            0xff
> +
> +#define IE_OFFSET                    0x38
> +#define IE_M_RX_FIFO_FULL_SHIFT      31
> +#define IE_M_RX_THLD_SHIFT           30
> +#define IE_M_START_BUSY_SHIFT        28
> +
> +#define IS_OFFSET                    0x3c
> +#define IS_M_RX_FIFO_FULL_SHIFT      31
> +#define IS_M_RX_THLD_SHIFT           30
> +#define IS_M_START_BUSY_SHIFT        28
> +
> +#define M_TX_OFFSET                  0x40
> +#define M_TX_WR_STATUS_SHIFT         31
> +#define M_TX_DATA_SHIFT              0
> +#define M_TX_DATA_MASK               0xff
> +
> +#define M_RX_OFFSET                  0x44
> +#define M_RX_STATUS_SHIFT            30
> +#define M_RX_STATUS_MASK             0x03
> +#define M_RX_PEC_ERR_SHIFT           29
> +#define M_RX_DATA_SHIFT              0
> +#define M_RX_DATA_MASK               0xff
> +
> +#define I2C_TIMEOUT_MESC             100
> +#define M_TX_RX_FIFO_SIZE            64
> +
> +enum bus_speed_index {
> +	I2C_SPD_100K = 0,
> +	I2C_SPD_400K,
> +};
> +
> +struct bcm_iproc_i2c_dev {
> +	struct device *device;
> +	int irq;
> +
> +	void __iomem *base;
> +
> +	struct i2c_adapter adapter;
> +
> +	struct completion done;
> +	int xfer_is_done;
> +};
> +
> +/*
> + * Can be expanded in the future if more interrupt status bits are utilized
> + */
> +#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
> +
> +static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
> +{
> +	struct bcm_iproc_i2c_dev *iproc_i2c = data;
> +	u32 status = readl(iproc_i2c->base + IS_OFFSET);
> +
> +	status &= ISR_MASK;
> +
> +	if (!status)
> +		return IRQ_NONE;
> +
> +	writel(status, iproc_i2c->base + IS_OFFSET);
> +	iproc_i2c->xfer_is_done = 1;
> +	complete_all(&iproc_i2c->done);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static bool bcm_iproc_i2c_bus_busy(struct bcm_iproc_i2c_dev *iproc_i2c)
> +{
> +	if (readl(iproc_i2c->base + M_CMD_OFFSET) &
> +	    (1 << M_CMD_START_BUSY_SHIFT))
> +		return true;
> +	else
> +		return false;
> +}
> +
> +static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *iproc_i2c,
> +				     struct i2c_msg *msg, u8 *addr)
> +{
> +
> +	if (msg->flags & I2C_M_TEN) {
> +		dev_err(iproc_i2c->device, "no support for 10-bit address\n");
> +		return -EINVAL;
> +	}

This looks harmless, but might be redundant since you aren't advertising I2C_FUNC_10BIT_ADDR anyway.

> +
> +	*addr = msg->addr << 1;
> +
> +	if (msg->flags & I2C_M_RD)
> +		*addr |= 1;
> +
> +	return 0;
> +}
> +
> +static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *iproc_i2c,
> +				      struct i2c_msg *msg)
> +{
> +	u32 val;
> +
> +	val = readl(iproc_i2c->base + M_CMD_OFFSET);
> +	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
> +
> +	switch (val) {
> +	case M_CMD_STATUS_SUCCESS:
> +		return 0;
> +
> +	case M_CMD_STATUS_LOST_ARB:
> +		dev_dbg(iproc_i2c->device, "lost bus arbitration\n");
> +		return -EAGAIN;
> +
> +	case M_CMD_STATUS_NACK_ADDR:
> +		dev_dbg(iproc_i2c->device, "NAK addr:0x%02x\n", msg->addr);
> +		return -ENXIO;
> +
> +	case M_CMD_STATUS_NACK_DATA:
> +		dev_dbg(iproc_i2c->device, "NAK data\n");
> +		return -ENXIO;
> +
> +	case M_CMD_STATUS_TIMEOUT:
> +		dev_dbg(iproc_i2c->device, "bus timeout\n");
> +		return -ETIMEDOUT;
> +
> +	default:
> +		dev_dbg(iproc_i2c->device, "unknown error code=%d\n", val);
> +		return -EIO;
> +	}
> +}
> +
> +static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *iproc_i2c,
> +					 struct i2c_msg *msg)
> +{
> +	int ret, i;
> +	u8 addr;
> +	u32 val;
> +	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
> +
> +	if (msg->len > M_TX_RX_FIFO_SIZE - 1) {
> +		dev_err(iproc_i2c->device,
> +			"only support data length up to %u bytes\n",
> +			M_TX_RX_FIFO_SIZE - 1);
> +		return -EINVAL;
> +	}

If the FIFO is 64 bytes, are we limited to 63 bytes of data because the slave address consumes 1 byte of FIFO space?  If so, it might be helpful to add a comment to that effect.

> +
> +	if (bcm_iproc_i2c_bus_busy(iproc_i2c)) {
> +		dev_warn(iproc_i2c->device, "bus is busy\n");
> +		return -EBUSY;
> +	}
> +
> +	ret = bcm_iproc_i2c_format_addr(iproc_i2c, msg, &addr);
> +	if (ret)
> +		return ret;
> +
> +	/* load slave address into the TX FIFO */
> +	writel(addr, iproc_i2c->base + M_TX_OFFSET);
> +
> +	/* for a write transaction, load data into the TX FIFO */
> +	if (!(msg->flags & I2C_M_RD)) {
> +		for (i = 0; i < msg->len; i++) {
> +			val = msg->buf[i];
> +
> +			/* mark the last byte */
> +			if (i == msg->len - 1)
> +				val |= 1 << M_TX_WR_STATUS_SHIFT;
> +
> +			writel(val, iproc_i2c->base + M_TX_OFFSET);
> +		}

If msg->len == 1 and msg->buf[0] == 0x00, we will writel(0x80000000, iproc_i2c->base + M_TX_OFFSET);

> +
> +		if (msg->len == 0)
> +			writel(1 << M_TX_WR_STATUS_SHIFT,
> +			       iproc_i2c->base + M_TX_OFFSET);

...so if msg->len == 0, does that mean this sends a dummy 0x00 data byte out on the wire?

If that's a hardware limitation (M_TX_WR_STATUS_SHIFT prohibited on the address byte), it's probably worth leaving a note in the code.

> +	}
> +
> +	/* mark as incomplete before starting the transaction */
> +	reinit_completion(&iproc_i2c->done);
> +	iproc_i2c->xfer_is_done = 0;
> +
> +	/*
> +	 * Enable the "start busy" interrupt, which will be triggered after the
> +	 * transaction is done, i.e., the internal start_busy bit, transitions
> +	 * from 1 to 0.
> +	 */
> +	writel(1 << IE_M_START_BUSY_SHIFT, iproc_i2c->base + IE_OFFSET);
> +
> +	/*
> +	 * Now we can activate the transfer. For a read operation, specify the
> +	 * number of bytes to read
> +	 */
> +	val = 1 << M_CMD_START_BUSY_SHIFT;
> +	if (msg->flags & I2C_M_RD) {
> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
> +		       (msg->len << M_CMD_RD_CNT_SHIFT);
> +	} else {
> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
> +	}
> +	writel(val, iproc_i2c->base + M_CMD_OFFSET);
> +
> +	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
> +
> +	/* disable all interrupts */
> +	writel(0, iproc_i2c->base + IE_OFFSET);
> +	/* read it back to flush the write */
> +	readl(iproc_i2c->base + IE_OFFSET);
> +
> +	/* make sure the interrupt handler isn't running */
> +	synchronize_irq(iproc_i2c->irq);
> +
> +	if (!time_left && !iproc_i2c->xfer_is_done) {
> +		dev_err(iproc_i2c->device, "transaction timed out\n");
> +
> +		/* flush FIFOs */
> +		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
> +		      (1 << M_FIFO_TX_FLUSH_SHIFT);
> +		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
> +		return -ETIMEDOUT;
> +	}
> +
> +	ret = bcm_iproc_i2c_check_status(iproc_i2c, msg);
> +	if (ret) {
> +		/* flush both TX/RX FIFOs */
> +		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
> +		      (1 << M_FIFO_TX_FLUSH_SHIFT);
> +		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
> +		return ret;
> +	}
> +
> +	/*
> +	 * For a read operation, we now need to load the data from FIFO
> +	 * into the memory buffer
> +	 */
> +	if (msg->flags & I2C_M_RD) {
> +		for (i = 0; i < msg->len; i++) {
> +			msg->buf[i] = (readl(iproc_i2c->base + M_RX_OFFSET) >>
> +				      M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
> +		}
> +	}
> +
> +	dev_dbg(iproc_i2c->device, "xfer %c, addr=0x%02x, len=%d\n",
> +		(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
> +		msg->len);
> +	dev_dbg(iproc_i2c->device, "**** data start ****\n");
> +	for (i = 0; i < msg->len; i++)
> +		dev_dbg(iproc_i2c->device, "0x%02x ",  msg->buf[i]);
> +	dev_dbg(iproc_i2c->device, "**** data end ****\n");

It might be simpler to just do:

    print_hex_dump_bytes("iproc_i2c:", DUMP_PREFIX_NONE, msg->buf, msg->len);

although you'd lose the ability to see the I2C device name.

> +
> +	return 0;
> +}
> +
> +static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
> +			      struct i2c_msg msgs[], int num)
> +{
> +	struct bcm_iproc_i2c_dev *iproc_i2c = i2c_get_adapdata(adapter);
> +	int ret, i;
> +
> +	/* go through all messages */
> +	for (i = 0; i < num; i++) {
> +		ret = bcm_iproc_i2c_xfer_single_msg(iproc_i2c, &msgs[i]);
> +		if (ret) {
> +			dev_err(iproc_i2c->device, "xfer failed\n");
> +			return ret;
> +		}
> +	}
> +
> +	return num;
> +}
> +
> +static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
> +{
> +	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
> +}
> +
> +static const struct i2c_algorithm bcm_iproc_algo = {
> +	.master_xfer = bcm_iproc_i2c_xfer,
> +	.functionality = bcm_iproc_i2c_functionality,
> +};
> +
> +static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
> +{
> +	unsigned int bus_speed, speed_bit;
> +	u32 val;
> +	int ret = of_property_read_u32(iproc_i2c->device->of_node,
> +				       "clock-frequency", &bus_speed);
> +	if (ret < 0) {
> +		dev_info(iproc_i2c->device,
> +			"unable to interpret clock-frequency DT property\n");
> +		bus_speed = 100000;
> +	}
> +
> +	if (bus_speed < 100000) {
> +		dev_err(iproc_i2c->device, "%d Hz bus speed not supported\n",
> +			bus_speed);
> +		dev_err(iproc_i2c->device,
> +			"valid speeds are 100khz and 400khz\n");
> +		return -EINVAL;
> +	} else if (bus_speed < 400000) {
> +		speed_bit = 0;
> +	} else {
> +		/* bus_speed >= 400000 */
> +		speed_bit = 1;
> +	}
> +
> +	val = readl(iproc_i2c->base + TIM_CFG_OFFSET);
> +	val &= ~(1 << TIM_CFG_MODE_400_SHIFT);
> +	val |= speed_bit << TIM_CFG_MODE_400_SHIFT;
> +	writel(val, iproc_i2c->base + TIM_CFG_OFFSET);
> +
> +	dev_info(iproc_i2c->device, "bus set to %u Hz\n", bus_speed);

The message would be more accurate if it reported 100 kHz or 400 kHz, since the driver isn't able to support arbitrary speeds.  Somebody could be surprised if they ask for 200 kHz but the transactions run at 100 kHz.

> +
> +	return 0;
> +}
> +
> +static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *iproc_i2c)
> +{
> +	u32 val;
> +
> +	/* put controller in reset */
> +	val = readl(iproc_i2c->base + CFG_OFFSET);
> +	val |= 1 << CFG_RESET_SHIFT;
> +	val &= ~(1 << CFG_EN_SHIFT);
> +	writel(val, iproc_i2c->base + CFG_OFFSET);
> +
> +	/* wait 100 usec per spec */
> +	udelay(100);
> +
> +	/* bring controller out of reset */
> +	val &= ~(1 << CFG_RESET_SHIFT);
> +	writel(val, iproc_i2c->base + CFG_OFFSET);
> +
> +	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
> +	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
> +	writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
> +
> +	/* disable all interrupts */
> +	writel(0, iproc_i2c->base + IE_OFFSET);
> +
> +	/* clear all pending interrupts */
> +	writel(0xffffffff, iproc_i2c->base + IS_OFFSET);
> +
> +	return 0;
> +}
> +
> +static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *iproc_i2c)
> +{
> +	u32 val;
> +
> +	val = readl(iproc_i2c->base + CFG_OFFSET);
> +	val |= 1 << CFG_EN_SHIFT;
> +	writel(val, iproc_i2c->base + CFG_OFFSET);
> +}
> +
> +static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *iproc_i2c)
> +{
> +	u32 val;
> +
> +	val = readl(iproc_i2c->base + CFG_OFFSET);
> +	val &= ~(1 << CFG_EN_SHIFT);
> +	writel(val, iproc_i2c->base + CFG_OFFSET);
> +}
> +
> +static int bcm_iproc_i2c_probe(struct platform_device *pdev)
> +{
> +	int irq, ret = 0;
> +	struct bcm_iproc_i2c_dev *iproc_i2c;
> +	struct i2c_adapter *adap;
> +	struct resource *res;
> +
> +	iproc_i2c = devm_kzalloc(&pdev->dev, sizeof(*iproc_i2c),
> +				 GFP_KERNEL);
> +	if (!iproc_i2c)
> +		return -ENOMEM;
> +
> +	platform_set_drvdata(pdev, iproc_i2c);
> +	iproc_i2c->device = &pdev->dev;
> +	init_completion(&iproc_i2c->done);
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	iproc_i2c->base = devm_ioremap_resource(iproc_i2c->device, res);
> +	if (IS_ERR(iproc_i2c->base))
> +		return PTR_ERR(iproc_i2c->base);
> +
> +	ret = bcm_iproc_i2c_init(iproc_i2c);
> +	if (ret)
> +		return ret;
> +
> +	ret = bcm_iproc_i2c_cfg_speed(iproc_i2c);
> +	if (ret)
> +		return ret;
> +
> +	irq = platform_get_irq(pdev, 0);
> +	if (irq <= 0) {
> +		dev_err(iproc_i2c->device, "no irq resource\n");
> +		return irq;
> +	}

AFAICT platform_get_irq() can return IRQ 0 on success.  Unlike irq_of_parse_and_map().

Other than that it looks fine to me, so for all three patches in the series:

Reviewed-by: Kevin Cernekee <cernekee@chromium.org>


> +	iproc_i2c->irq = irq;
> +
> +	ret = devm_request_irq(iproc_i2c->device, irq, bcm_iproc_i2c_isr, 0,
> +			       pdev->name, iproc_i2c);
> +	if (ret < 0) {
> +		dev_err(iproc_i2c->device, "unable to request irq %i\n", irq);
> +		return ret;
> +	}
> +
> +	bcm_iproc_i2c_enable(iproc_i2c);
> +
> +	adap = &iproc_i2c->adapter;
> +	i2c_set_adapdata(adap, iproc_i2c);
> +	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
> +	adap->algo = &bcm_iproc_algo;
> +	adap->dev.parent = &pdev->dev;
> +	adap->dev.of_node = pdev->dev.of_node;
> +
> +	ret = i2c_add_adapter(adap);
> +	if (ret) {
> +		dev_err(iproc_i2c->device, "failed to add adapter\n");
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
> +{
> +	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
> +
> +	/* make sure there's no pending interrupt when we remove the adapter */
> +	writel(0, iproc_i2c->base + IE_OFFSET);
> +	readl(iproc_i2c->base + IE_OFFSET);
> +	synchronize_irq(iproc_i2c->irq);
> +
> +	i2c_del_adapter(&iproc_i2c->adapter);
> +	bcm_iproc_i2c_disable(iproc_i2c);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id bcm_iproc_i2c_of_match[] = {
> +	{ .compatible = "brcm,iproc-i2c" },
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
> +
> +static struct platform_driver bcm_iproc_i2c_driver = {
> +	.driver = {
> +		.name = "bcm-iproc-i2c",
> +		.of_match_table = bcm_iproc_i2c_of_match,
> +	},
> +	.probe = bcm_iproc_i2c_probe,
> +	.remove = bcm_iproc_i2c_remove,
> +};
> +module_platform_driver(bcm_iproc_i2c_driver);
> +
> +MODULE_AUTHOR("Ray Jui <rjui <at> broadcom.com>");
> +MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
> +MODULE_LICENSE("GPL v2");

[v7,2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Kevin Cernekee]

On Mon, Jan 19, 2015 at 01:51:49PM -0800, Ray Jui wrote:
> Add initial support to the Broadcom iProc I2C controller found in the
> iProc family of SoCs.
> 
> The iProc I2C controller has separate internal TX and RX FIFOs, each has
> a size of 64 bytes. The iProc I2C controller supports two bus speeds
> including standard mode (100kHz) and fast mode (400kHz)
> 
> Signed-off-by: Ray Jui <rjui <at> broadcom.com>
> Reviewed-by: Scott Branden <sbranden <at> broadcom.com>
> ---
>  drivers/i2c/busses/Kconfig         |   10 +
>  drivers/i2c/busses/Makefile        |    1 +
>  drivers/i2c/busses/i2c-bcm-iproc.c |  505 ++++++++++++++++++++++++++++++++++++
>  3 files changed, 516 insertions(+)
>  create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c
> 
> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
> index 31e8308..af76d23 100644
> --- a/drivers/i2c/busses/Kconfig
> +++ b/drivers/i2c/busses/Kconfig
>  <at>  <at>  -372,6 +372,16  <at>  <at>  config I2C_BCM2835
>  	  This support is also available as a module.  If so, the module
>  	  will be called i2c-bcm2835.
> 
> +config I2C_BCM_IPROC
> +	tristate "Broadcom iProc I2C controller"
> +	depends on ARCH_BCM_IPROC || COMPILE_TEST
> +	default ARCH_BCM_IPROC
> +	help
> +	  If you say yes to this option, support will be included for the
> +	  Broadcom iProc I2C controller.
> +
> +	  If you don't know what to do here, say N.
> +
>  config I2C_BCM_KONA
>  	tristate "BCM Kona I2C adapter"
>  	depends on ARCH_BCM_MOBILE
> diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
> index 56388f6..d93b509 100644
> --- a/drivers/i2c/busses/Makefile
> +++ b/drivers/i2c/busses/Makefile
>  <at>  <at>  -33,6 +33,7  <at>  <at>  obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
>  obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
>  obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
>  obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
> +obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
>  obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
>  obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
>  obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
> diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
> new file mode 100644
> index 0000000..64c622f
> --- /dev/null
> +++ b/drivers/i2c/busses/i2c-bcm-iproc.c
>  <at>  <at>  -0,0 +1,505  <at>  <at> 
> +/*
> + * Copyright (C) 2014 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/i2c.h>
> +#include <linux/interrupt.h>
> +#include <linux/platform_device.h>
> +#include <linux/io.h>
> +#include <linux/slab.h>
> +#include <linux/delay.h>
> +
> +#define CFG_OFFSET                   0x00
> +#define CFG_RESET_SHIFT              31
> +#define CFG_EN_SHIFT                 30
> +#define CFG_M_RETRY_CNT_SHIFT        16
> +#define CFG_M_RETRY_CNT_MASK         0x0f
> +
> +#define TIM_CFG_OFFSET               0x04
> +#define TIM_CFG_MODE_400_SHIFT       31
> +
> +#define M_FIFO_CTRL_OFFSET           0x0c
> +#define M_FIFO_RX_FLUSH_SHIFT        31
> +#define M_FIFO_TX_FLUSH_SHIFT        30
> +#define M_FIFO_RX_CNT_SHIFT          16
> +#define M_FIFO_RX_CNT_MASK           0x7f
> +#define M_FIFO_RX_THLD_SHIFT         8
> +#define M_FIFO_RX_THLD_MASK          0x3f
> +
> +#define M_CMD_OFFSET                 0x30
> +#define M_CMD_START_BUSY_SHIFT       31
> +#define M_CMD_STATUS_SHIFT           25
> +#define M_CMD_STATUS_MASK            0x07
> +#define M_CMD_STATUS_SUCCESS         0x0
> +#define M_CMD_STATUS_LOST_ARB        0x1
> +#define M_CMD_STATUS_NACK_ADDR       0x2
> +#define M_CMD_STATUS_NACK_DATA       0x3
> +#define M_CMD_STATUS_TIMEOUT         0x4
> +#define M_CMD_PROTOCOL_SHIFT         9
> +#define M_CMD_PROTOCOL_MASK          0xf
> +#define M_CMD_PROTOCOL_BLK_WR        0x7
> +#define M_CMD_PROTOCOL_BLK_RD        0x8
> +#define M_CMD_PEC_SHIFT              8
> +#define M_CMD_RD_CNT_SHIFT           0
> +#define M_CMD_RD_CNT_MASK            0xff
> +
> +#define IE_OFFSET                    0x38
> +#define IE_M_RX_FIFO_FULL_SHIFT      31
> +#define IE_M_RX_THLD_SHIFT           30
> +#define IE_M_START_BUSY_SHIFT        28
> +
> +#define IS_OFFSET                    0x3c
> +#define IS_M_RX_FIFO_FULL_SHIFT      31
> +#define IS_M_RX_THLD_SHIFT           30
> +#define IS_M_START_BUSY_SHIFT        28
> +
> +#define M_TX_OFFSET                  0x40
> +#define M_TX_WR_STATUS_SHIFT         31
> +#define M_TX_DATA_SHIFT              0
> +#define M_TX_DATA_MASK               0xff
> +
> +#define M_RX_OFFSET                  0x44
> +#define M_RX_STATUS_SHIFT            30
> +#define M_RX_STATUS_MASK             0x03
> +#define M_RX_PEC_ERR_SHIFT           29
> +#define M_RX_DATA_SHIFT              0
> +#define M_RX_DATA_MASK               0xff
> +
> +#define I2C_TIMEOUT_MESC             100
> +#define M_TX_RX_FIFO_SIZE            64
> +
> +enum bus_speed_index {
> +	I2C_SPD_100K = 0,
> +	I2C_SPD_400K,
> +};
> +
> +struct bcm_iproc_i2c_dev {
> +	struct device *device;
> +	int irq;
> +
> +	void __iomem *base;
> +
> +	struct i2c_adapter adapter;
> +
> +	struct completion done;
> +	int xfer_is_done;
> +};
> +
> +/*
> + * Can be expanded in the future if more interrupt status bits are utilized
> + */
> +#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
> +
> +static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
> +{
> +	struct bcm_iproc_i2c_dev *iproc_i2c = data;
> +	u32 status = readl(iproc_i2c->base + IS_OFFSET);
> +
> +	status &= ISR_MASK;
> +
> +	if (!status)
> +		return IRQ_NONE;
> +
> +	writel(status, iproc_i2c->base + IS_OFFSET);
> +	iproc_i2c->xfer_is_done = 1;
> +	complete_all(&iproc_i2c->done);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static bool bcm_iproc_i2c_bus_busy(struct bcm_iproc_i2c_dev *iproc_i2c)
> +{
> +	if (readl(iproc_i2c->base + M_CMD_OFFSET) &
> +	    (1 << M_CMD_START_BUSY_SHIFT))
> +		return true;
> +	else
> +		return false;
> +}
> +
> +static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *iproc_i2c,
> +				     struct i2c_msg *msg, u8 *addr)
> +{
> +
> +	if (msg->flags & I2C_M_TEN) {
> +		dev_err(iproc_i2c->device, "no support for 10-bit address\n");
> +		return -EINVAL;
> +	}

This looks harmless, but might be redundant since you aren't advertising I2C_FUNC_10BIT_ADDR anyway.

> +
> +	*addr = msg->addr << 1;
> +
> +	if (msg->flags & I2C_M_RD)
> +		*addr |= 1;
> +
> +	return 0;
> +}
> +
> +static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *iproc_i2c,
> +				      struct i2c_msg *msg)
> +{
> +	u32 val;
> +
> +	val = readl(iproc_i2c->base + M_CMD_OFFSET);
> +	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
> +
> +	switch (val) {
> +	case M_CMD_STATUS_SUCCESS:
> +		return 0;
> +
> +	case M_CMD_STATUS_LOST_ARB:
> +		dev_dbg(iproc_i2c->device, "lost bus arbitration\n");
> +		return -EAGAIN;
> +
> +	case M_CMD_STATUS_NACK_ADDR:
> +		dev_dbg(iproc_i2c->device, "NAK addr:0x%02x\n", msg->addr);
> +		return -ENXIO;
> +
> +	case M_CMD_STATUS_NACK_DATA:
> +		dev_dbg(iproc_i2c->device, "NAK data\n");
> +		return -ENXIO;
> +
> +	case M_CMD_STATUS_TIMEOUT:
> +		dev_dbg(iproc_i2c->device, "bus timeout\n");
> +		return -ETIMEDOUT;
> +
> +	default:
> +		dev_dbg(iproc_i2c->device, "unknown error code=%d\n", val);
> +		return -EIO;
> +	}
> +}
> +
> +static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *iproc_i2c,
> +					 struct i2c_msg *msg)
> +{
> +	int ret, i;
> +	u8 addr;
> +	u32 val;
> +	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
> +
> +	if (msg->len > M_TX_RX_FIFO_SIZE - 1) {
> +		dev_err(iproc_i2c->device,
> +			"only support data length up to %u bytes\n",
> +			M_TX_RX_FIFO_SIZE - 1);
> +		return -EINVAL;
> +	}

If the FIFO is 64 bytes, are we limited to 63 bytes of data because the slave address consumes 1 byte of FIFO space?  If so, it might be helpful to add a comment to that effect.

> +
> +	if (bcm_iproc_i2c_bus_busy(iproc_i2c)) {
> +		dev_warn(iproc_i2c->device, "bus is busy\n");
> +		return -EBUSY;
> +	}
> +
> +	ret = bcm_iproc_i2c_format_addr(iproc_i2c, msg, &addr);
> +	if (ret)
> +		return ret;
> +
> +	/* load slave address into the TX FIFO */
> +	writel(addr, iproc_i2c->base + M_TX_OFFSET);
> +
> +	/* for a write transaction, load data into the TX FIFO */
> +	if (!(msg->flags & I2C_M_RD)) {
> +		for (i = 0; i < msg->len; i++) {
> +			val = msg->buf[i];
> +
> +			/* mark the last byte */
> +			if (i == msg->len - 1)
> +				val |= 1 << M_TX_WR_STATUS_SHIFT;
> +
> +			writel(val, iproc_i2c->base + M_TX_OFFSET);
> +		}

If msg->len == 1 and msg->buf[0] == 0x00, we will writel(0x80000000, iproc_i2c->base + M_TX_OFFSET);

> +
> +		if (msg->len == 0)
> +			writel(1 << M_TX_WR_STATUS_SHIFT,
> +			       iproc_i2c->base + M_TX_OFFSET);

...so if msg->len == 0, does that mean this sends a dummy 0x00 data byte out on the wire?

If that's a hardware limitation (M_TX_WR_STATUS_SHIFT prohibited on the address byte), it's probably worth leaving a note in the code.

> +	}
> +
> +	/* mark as incomplete before starting the transaction */
> +	reinit_completion(&iproc_i2c->done);
> +	iproc_i2c->xfer_is_done = 0;
> +
> +	/*
> +	 * Enable the "start busy" interrupt, which will be triggered after the
> +	 * transaction is done, i.e., the internal start_busy bit, transitions
> +	 * from 1 to 0.
> +	 */
> +	writel(1 << IE_M_START_BUSY_SHIFT, iproc_i2c->base + IE_OFFSET);
> +
> +	/*
> +	 * Now we can activate the transfer. For a read operation, specify the
> +	 * number of bytes to read
> +	 */
> +	val = 1 << M_CMD_START_BUSY_SHIFT;
> +	if (msg->flags & I2C_M_RD) {
> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
> +		       (msg->len << M_CMD_RD_CNT_SHIFT);
> +	} else {
> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
> +	}
> +	writel(val, iproc_i2c->base + M_CMD_OFFSET);
> +
> +	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
> +
> +	/* disable all interrupts */
> +	writel(0, iproc_i2c->base + IE_OFFSET);
> +	/* read it back to flush the write */
> +	readl(iproc_i2c->base + IE_OFFSET);
> +
> +	/* make sure the interrupt handler isn't running */
> +	synchronize_irq(iproc_i2c->irq);
> +
> +	if (!time_left && !iproc_i2c->xfer_is_done) {
> +		dev_err(iproc_i2c->device, "transaction timed out\n");
> +
> +		/* flush FIFOs */
> +		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
> +		      (1 << M_FIFO_TX_FLUSH_SHIFT);
> +		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
> +		return -ETIMEDOUT;
> +	}
> +
> +	ret = bcm_iproc_i2c_check_status(iproc_i2c, msg);
> +	if (ret) {
> +		/* flush both TX/RX FIFOs */
> +		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
> +		      (1 << M_FIFO_TX_FLUSH_SHIFT);
> +		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
> +		return ret;
> +	}
> +
> +	/*
> +	 * For a read operation, we now need to load the data from FIFO
> +	 * into the memory buffer
> +	 */
> +	if (msg->flags & I2C_M_RD) {
> +		for (i = 0; i < msg->len; i++) {
> +			msg->buf[i] = (readl(iproc_i2c->base + M_RX_OFFSET) >>
> +				      M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
> +		}
> +	}
> +
> +	dev_dbg(iproc_i2c->device, "xfer %c, addr=0x%02x, len=%d\n",
> +		(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
> +		msg->len);
> +	dev_dbg(iproc_i2c->device, "**** data start ****\n");
> +	for (i = 0; i < msg->len; i++)
> +		dev_dbg(iproc_i2c->device, "0x%02x ",  msg->buf[i]);
> +	dev_dbg(iproc_i2c->device, "**** data end ****\n");

It might be simpler to just do:

    print_hex_dump_bytes("iproc_i2c:", DUMP_PREFIX_NONE, msg->buf, msg->len);

although you'd lose the ability to see the I2C device name.

> +
> +	return 0;
> +}
> +
> +static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
> +			      struct i2c_msg msgs[], int num)
> +{
> +	struct bcm_iproc_i2c_dev *iproc_i2c = i2c_get_adapdata(adapter);
> +	int ret, i;
> +
> +	/* go through all messages */
> +	for (i = 0; i < num; i++) {
> +		ret = bcm_iproc_i2c_xfer_single_msg(iproc_i2c, &msgs[i]);
> +		if (ret) {
> +			dev_err(iproc_i2c->device, "xfer failed\n");
> +			return ret;
> +		}
> +	}
> +
> +	return num;
> +}
> +
> +static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
> +{
> +	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
> +}
> +
> +static const struct i2c_algorithm bcm_iproc_algo = {
> +	.master_xfer = bcm_iproc_i2c_xfer,
> +	.functionality = bcm_iproc_i2c_functionality,
> +};
> +
> +static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
> +{
> +	unsigned int bus_speed, speed_bit;
> +	u32 val;
> +	int ret = of_property_read_u32(iproc_i2c->device->of_node,
> +				       "clock-frequency", &bus_speed);
> +	if (ret < 0) {
> +		dev_info(iproc_i2c->device,
> +			"unable to interpret clock-frequency DT property\n");
> +		bus_speed = 100000;
> +	}
> +
> +	if (bus_speed < 100000) {
> +		dev_err(iproc_i2c->device, "%d Hz bus speed not supported\n",
> +			bus_speed);
> +		dev_err(iproc_i2c->device,
> +			"valid speeds are 100khz and 400khz\n");
> +		return -EINVAL;
> +	} else if (bus_speed < 400000) {
> +		speed_bit = 0;
> +	} else {
> +		/* bus_speed >= 400000 */
> +		speed_bit = 1;
> +	}
> +
> +	val = readl(iproc_i2c->base + TIM_CFG_OFFSET);
> +	val &= ~(1 << TIM_CFG_MODE_400_SHIFT);
> +	val |= speed_bit << TIM_CFG_MODE_400_SHIFT;
> +	writel(val, iproc_i2c->base + TIM_CFG_OFFSET);
> +
> +	dev_info(iproc_i2c->device, "bus set to %u Hz\n", bus_speed);

The message would be more accurate if it reported 100 kHz or 400 kHz, since the driver isn't able to support arbitrary speeds.  Somebody could be surprised if they ask for 200 kHz but the transactions run at 100 kHz.

> +
> +	return 0;
> +}
> +
> +static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *iproc_i2c)
> +{
> +	u32 val;
> +
> +	/* put controller in reset */
> +	val = readl(iproc_i2c->base + CFG_OFFSET);
> +	val |= 1 << CFG_RESET_SHIFT;
> +	val &= ~(1 << CFG_EN_SHIFT);
> +	writel(val, iproc_i2c->base + CFG_OFFSET);
> +
> +	/* wait 100 usec per spec */
> +	udelay(100);
> +
> +	/* bring controller out of reset */
> +	val &= ~(1 << CFG_RESET_SHIFT);
> +	writel(val, iproc_i2c->base + CFG_OFFSET);
> +
> +	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
> +	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
> +	writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
> +
> +	/* disable all interrupts */
> +	writel(0, iproc_i2c->base + IE_OFFSET);
> +
> +	/* clear all pending interrupts */
> +	writel(0xffffffff, iproc_i2c->base + IS_OFFSET);
> +
> +	return 0;
> +}
> +
> +static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *iproc_i2c)
> +{
> +	u32 val;
> +
> +	val = readl(iproc_i2c->base + CFG_OFFSET);
> +	val |= 1 << CFG_EN_SHIFT;
> +	writel(val, iproc_i2c->base + CFG_OFFSET);
> +}
> +
> +static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *iproc_i2c)
> +{
> +	u32 val;
> +
> +	val = readl(iproc_i2c->base + CFG_OFFSET);
> +	val &= ~(1 << CFG_EN_SHIFT);
> +	writel(val, iproc_i2c->base + CFG_OFFSET);
> +}
> +
> +static int bcm_iproc_i2c_probe(struct platform_device *pdev)
> +{
> +	int irq, ret = 0;
> +	struct bcm_iproc_i2c_dev *iproc_i2c;
> +	struct i2c_adapter *adap;
> +	struct resource *res;
> +
> +	iproc_i2c = devm_kzalloc(&pdev->dev, sizeof(*iproc_i2c),
> +				 GFP_KERNEL);
> +	if (!iproc_i2c)
> +		return -ENOMEM;
> +
> +	platform_set_drvdata(pdev, iproc_i2c);
> +	iproc_i2c->device = &pdev->dev;
> +	init_completion(&iproc_i2c->done);
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	iproc_i2c->base = devm_ioremap_resource(iproc_i2c->device, res);
> +	if (IS_ERR(iproc_i2c->base))
> +		return PTR_ERR(iproc_i2c->base);
> +
> +	ret = bcm_iproc_i2c_init(iproc_i2c);
> +	if (ret)
> +		return ret;
> +
> +	ret = bcm_iproc_i2c_cfg_speed(iproc_i2c);
> +	if (ret)
> +		return ret;
> +
> +	irq = platform_get_irq(pdev, 0);
> +	if (irq <= 0) {
> +		dev_err(iproc_i2c->device, "no irq resource\n");
> +		return irq;
> +	}

AFAICT platform_get_irq() can return IRQ 0 on success.  Unlike irq_of_parse_and_map().

Other than that it looks fine to me, so for all three patches in the series:

Reviewed-by: Kevin Cernekee <cernekee@chromium.org>


> +	iproc_i2c->irq = irq;
> +
> +	ret = devm_request_irq(iproc_i2c->device, irq, bcm_iproc_i2c_isr, 0,
> +			       pdev->name, iproc_i2c);
> +	if (ret < 0) {
> +		dev_err(iproc_i2c->device, "unable to request irq %i\n", irq);
> +		return ret;
> +	}
> +
> +	bcm_iproc_i2c_enable(iproc_i2c);
> +
> +	adap = &iproc_i2c->adapter;
> +	i2c_set_adapdata(adap, iproc_i2c);
> +	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
> +	adap->algo = &bcm_iproc_algo;
> +	adap->dev.parent = &pdev->dev;
> +	adap->dev.of_node = pdev->dev.of_node;
> +
> +	ret = i2c_add_adapter(adap);
> +	if (ret) {
> +		dev_err(iproc_i2c->device, "failed to add adapter\n");
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
> +{
> +	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
> +
> +	/* make sure there's no pending interrupt when we remove the adapter */
> +	writel(0, iproc_i2c->base + IE_OFFSET);
> +	readl(iproc_i2c->base + IE_OFFSET);
> +	synchronize_irq(iproc_i2c->irq);
> +
> +	i2c_del_adapter(&iproc_i2c->adapter);
> +	bcm_iproc_i2c_disable(iproc_i2c);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id bcm_iproc_i2c_of_match[] = {
> +	{ .compatible = "brcm,iproc-i2c" },
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
> +
> +static struct platform_driver bcm_iproc_i2c_driver = {
> +	.driver = {
> +		.name = "bcm-iproc-i2c",
> +		.of_match_table = bcm_iproc_i2c_of_match,
> +	},
> +	.probe = bcm_iproc_i2c_probe,
> +	.remove = bcm_iproc_i2c_remove,
> +};
> +module_platform_driver(bcm_iproc_i2c_driver);
> +
> +MODULE_AUTHOR("Ray Jui <rjui <at> broadcom.com>");
> +MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
> +MODULE_LICENSE("GPL v2");

Re: [v7,2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Dmitry Torokhov]

On Fri, Feb 6, 2015 at 2:31 PM, Kevin Cernekee <cernekee@chromium.org> wrote:
> On Mon, Jan 19, 2015 at 01:51:49PM -0800, Ray Jui wrote:
>> +
>> +     dev_dbg(iproc_i2c->device, "xfer %c, addr=0x%02x, len=%d\n",
>> +             (msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
>> +             msg->len);
>> +     dev_dbg(iproc_i2c->device, "**** data start ****\n");
>> +     for (i = 0; i < msg->len; i++)
>> +             dev_dbg(iproc_i2c->device, "0x%02x ",  msg->buf[i]);
>> +     dev_dbg(iproc_i2c->device, "**** data end ****\n");
>
> It might be simpler to just do:
>
>     print_hex_dump_bytes("iproc_i2c:", DUMP_PREFIX_NONE, msg->buf, msg->len);
>
> although you'd lose the ability to see the I2C device name.

We can also do:

dev_dbg(iproc_i2c->device, "*** data: %*ph\n", msg->len, msg->buf);

if we are OK with limiting output to 64 bytes.

Thanks,
Dmitry

Re: [v7,2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Dmitry Torokhov]

On Fri, Feb 6, 2015 at 2:31 PM, Kevin Cernekee <cernekee-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org> wrote:
> On Mon, Jan 19, 2015 at 01:51:49PM -0800, Ray Jui wrote:
>> +
>> +     dev_dbg(iproc_i2c->device, "xfer %c, addr=0x%02x, len=%d\n",
>> +             (msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
>> +             msg->len);
>> +     dev_dbg(iproc_i2c->device, "**** data start ****\n");
>> +     for (i = 0; i < msg->len; i++)
>> +             dev_dbg(iproc_i2c->device, "0x%02x ",  msg->buf[i]);
>> +     dev_dbg(iproc_i2c->device, "**** data end ****\n");
>
> It might be simpler to just do:
>
>     print_hex_dump_bytes("iproc_i2c:", DUMP_PREFIX_NONE, msg->buf, msg->len);
>
> although you'd lose the ability to see the I2C device name.

We can also do:

dev_dbg(iproc_i2c->device, "*** data: %*ph\n", msg->len, msg->buf);

if we are OK with limiting output to 64 bytes.

Thanks,
Dmitry

[v7,2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Dmitry Torokhov]

On Fri, Feb 6, 2015 at 2:31 PM, Kevin Cernekee <cernekee@chromium.org> wrote:
> On Mon, Jan 19, 2015 at 01:51:49PM -0800, Ray Jui wrote:
>> +
>> +     dev_dbg(iproc_i2c->device, "xfer %c, addr=0x%02x, len=%d\n",
>> +             (msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
>> +             msg->len);
>> +     dev_dbg(iproc_i2c->device, "**** data start ****\n");
>> +     for (i = 0; i < msg->len; i++)
>> +             dev_dbg(iproc_i2c->device, "0x%02x ",  msg->buf[i]);
>> +     dev_dbg(iproc_i2c->device, "**** data end ****\n");
>
> It might be simpler to just do:
>
>     print_hex_dump_bytes("iproc_i2c:", DUMP_PREFIX_NONE, msg->buf, msg->len);
>
> although you'd lose the ability to see the I2C device name.

We can also do:

dev_dbg(iproc_i2c->device, "*** data: %*ph\n", msg->len, msg->buf);

if we are OK with limiting output to 64 bytes.

Thanks,
Dmitry

Re: [v7,2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Kevin Cernekee]

On Fri, Feb 6, 2015 at 2:48 PM, Dmitry Torokhov <dtor@chromium.org> wrote:
> On Fri, Feb 6, 2015 at 2:31 PM, Kevin Cernekee <cernekee@chromium.org> wrote:
>> On Mon, Jan 19, 2015 at 01:51:49PM -0800, Ray Jui wrote:
>>> +
>>> +     dev_dbg(iproc_i2c->device, "xfer %c, addr=0x%02x, len=%d\n",
>>> +             (msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
>>> +             msg->len);
>>> +     dev_dbg(iproc_i2c->device, "**** data start ****\n");
>>> +     for (i = 0; i < msg->len; i++)
>>> +             dev_dbg(iproc_i2c->device, "0x%02x ",  msg->buf[i]);
>>> +     dev_dbg(iproc_i2c->device, "**** data end ****\n");
>>
>> It might be simpler to just do:
>>
>>     print_hex_dump_bytes("iproc_i2c:", DUMP_PREFIX_NONE, msg->buf, msg->len);
>>
>> although you'd lose the ability to see the I2C device name.
>
> We can also do:
>
> dev_dbg(iproc_i2c->device, "*** data: %*ph\n", msg->len, msg->buf);
>
> if we are OK with limiting output to 64 bytes.

msg->len is capped at 63 due to hardware limits, so that should work.

Re: [v7,2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Kevin Cernekee]

On Fri, Feb 6, 2015 at 2:48 PM, Dmitry Torokhov <dtor-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org> wrote:
> On Fri, Feb 6, 2015 at 2:31 PM, Kevin Cernekee <cernekee-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org> wrote:
>> On Mon, Jan 19, 2015 at 01:51:49PM -0800, Ray Jui wrote:
>>> +
>>> +     dev_dbg(iproc_i2c->device, "xfer %c, addr=0x%02x, len=%d\n",
>>> +             (msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
>>> +             msg->len);
>>> +     dev_dbg(iproc_i2c->device, "**** data start ****\n");
>>> +     for (i = 0; i < msg->len; i++)
>>> +             dev_dbg(iproc_i2c->device, "0x%02x ",  msg->buf[i]);
>>> +     dev_dbg(iproc_i2c->device, "**** data end ****\n");
>>
>> It might be simpler to just do:
>>
>>     print_hex_dump_bytes("iproc_i2c:", DUMP_PREFIX_NONE, msg->buf, msg->len);
>>
>> although you'd lose the ability to see the I2C device name.
>
> We can also do:
>
> dev_dbg(iproc_i2c->device, "*** data: %*ph\n", msg->len, msg->buf);
>
> if we are OK with limiting output to 64 bytes.

msg->len is capped at 63 due to hardware limits, so that should work.

[v7,2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Kevin Cernekee]

On Fri, Feb 6, 2015 at 2:48 PM, Dmitry Torokhov <dtor@chromium.org> wrote:
> On Fri, Feb 6, 2015 at 2:31 PM, Kevin Cernekee <cernekee@chromium.org> wrote:
>> On Mon, Jan 19, 2015 at 01:51:49PM -0800, Ray Jui wrote:
>>> +
>>> +     dev_dbg(iproc_i2c->device, "xfer %c, addr=0x%02x, len=%d\n",
>>> +             (msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
>>> +             msg->len);
>>> +     dev_dbg(iproc_i2c->device, "**** data start ****\n");
>>> +     for (i = 0; i < msg->len; i++)
>>> +             dev_dbg(iproc_i2c->device, "0x%02x ",  msg->buf[i]);
>>> +     dev_dbg(iproc_i2c->device, "**** data end ****\n");
>>
>> It might be simpler to just do:
>>
>>     print_hex_dump_bytes("iproc_i2c:", DUMP_PREFIX_NONE, msg->buf, msg->len);
>>
>> although you'd lose the ability to see the I2C device name.
>
> We can also do:
>
> dev_dbg(iproc_i2c->device, "*** data: %*ph\n", msg->len, msg->buf);
>
> if we are OK with limiting output to 64 bytes.

msg->len is capped at 63 due to hardware limits, so that should work.

Re: [v7,2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 2/6/2015 2:31 PM, Kevin Cernekee wrote:
> On Mon, Jan 19, 2015 at 01:51:49PM -0800, Ray Jui wrote:
>> Add initial support to the Broadcom iProc I2C controller found in the
>> iProc family of SoCs.
>>
>> The iProc I2C controller has separate internal TX and RX FIFOs, each has
>> a size of 64 bytes. The iProc I2C controller supports two bus speeds
>> including standard mode (100kHz) and fast mode (400kHz)
>>
>> Signed-off-by: Ray Jui <rjui <at> broadcom.com>
>> Reviewed-by: Scott Branden <sbranden <at> broadcom.com>
>> ---
>>  drivers/i2c/busses/Kconfig         |   10 +
>>  drivers/i2c/busses/Makefile        |    1 +
>>  drivers/i2c/busses/i2c-bcm-iproc.c |  505 ++++++++++++++++++++++++++++++++++++
>>  3 files changed, 516 insertions(+)
>>  create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c
>>
>> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
>> index 31e8308..af76d23 100644
>> --- a/drivers/i2c/busses/Kconfig
>> +++ b/drivers/i2c/busses/Kconfig
>>  <at>  <at>  -372,6 +372,16  <at>  <at>  config I2C_BCM2835
>>  	  This support is also available as a module.  If so, the module
>>  	  will be called i2c-bcm2835.
>>
>> +config I2C_BCM_IPROC
>> +	tristate "Broadcom iProc I2C controller"
>> +	depends on ARCH_BCM_IPROC || COMPILE_TEST
>> +	default ARCH_BCM_IPROC
>> +	help
>> +	  If you say yes to this option, support will be included for the
>> +	  Broadcom iProc I2C controller.
>> +
>> +	  If you don't know what to do here, say N.
>> +
>>  config I2C_BCM_KONA
>>  	tristate "BCM Kona I2C adapter"
>>  	depends on ARCH_BCM_MOBILE
>> diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
>> index 56388f6..d93b509 100644
>> --- a/drivers/i2c/busses/Makefile
>> +++ b/drivers/i2c/busses/Makefile
>>  <at>  <at>  -33,6 +33,7  <at>  <at>  obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
>>  obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
>>  obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
>>  obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
>> +obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
>>  obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
>>  obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
>>  obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
>> diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
>> new file mode 100644
>> index 0000000..64c622f
>> --- /dev/null
>> +++ b/drivers/i2c/busses/i2c-bcm-iproc.c
>>  <at>  <at>  -0,0 +1,505  <at>  <at> 
>> +/*
>> + * Copyright (C) 2014 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/i2c.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/io.h>
>> +#include <linux/slab.h>
>> +#include <linux/delay.h>
>> +
>> +#define CFG_OFFSET                   0x00
>> +#define CFG_RESET_SHIFT              31
>> +#define CFG_EN_SHIFT                 30
>> +#define CFG_M_RETRY_CNT_SHIFT        16
>> +#define CFG_M_RETRY_CNT_MASK         0x0f
>> +
>> +#define TIM_CFG_OFFSET               0x04
>> +#define TIM_CFG_MODE_400_SHIFT       31
>> +
>> +#define M_FIFO_CTRL_OFFSET           0x0c
>> +#define M_FIFO_RX_FLUSH_SHIFT        31
>> +#define M_FIFO_TX_FLUSH_SHIFT        30
>> +#define M_FIFO_RX_CNT_SHIFT          16
>> +#define M_FIFO_RX_CNT_MASK           0x7f
>> +#define M_FIFO_RX_THLD_SHIFT         8
>> +#define M_FIFO_RX_THLD_MASK          0x3f
>> +
>> +#define M_CMD_OFFSET                 0x30
>> +#define M_CMD_START_BUSY_SHIFT       31
>> +#define M_CMD_STATUS_SHIFT           25
>> +#define M_CMD_STATUS_MASK            0x07
>> +#define M_CMD_STATUS_SUCCESS         0x0
>> +#define M_CMD_STATUS_LOST_ARB        0x1
>> +#define M_CMD_STATUS_NACK_ADDR       0x2
>> +#define M_CMD_STATUS_NACK_DATA       0x3
>> +#define M_CMD_STATUS_TIMEOUT         0x4
>> +#define M_CMD_PROTOCOL_SHIFT         9
>> +#define M_CMD_PROTOCOL_MASK          0xf
>> +#define M_CMD_PROTOCOL_BLK_WR        0x7
>> +#define M_CMD_PROTOCOL_BLK_RD        0x8
>> +#define M_CMD_PEC_SHIFT              8
>> +#define M_CMD_RD_CNT_SHIFT           0
>> +#define M_CMD_RD_CNT_MASK            0xff
>> +
>> +#define IE_OFFSET                    0x38
>> +#define IE_M_RX_FIFO_FULL_SHIFT      31
>> +#define IE_M_RX_THLD_SHIFT           30
>> +#define IE_M_START_BUSY_SHIFT        28
>> +
>> +#define IS_OFFSET                    0x3c
>> +#define IS_M_RX_FIFO_FULL_SHIFT      31
>> +#define IS_M_RX_THLD_SHIFT           30
>> +#define IS_M_START_BUSY_SHIFT        28
>> +
>> +#define M_TX_OFFSET                  0x40
>> +#define M_TX_WR_STATUS_SHIFT         31
>> +#define M_TX_DATA_SHIFT              0
>> +#define M_TX_DATA_MASK               0xff
>> +
>> +#define M_RX_OFFSET                  0x44
>> +#define M_RX_STATUS_SHIFT            30
>> +#define M_RX_STATUS_MASK             0x03
>> +#define M_RX_PEC_ERR_SHIFT           29
>> +#define M_RX_DATA_SHIFT              0
>> +#define M_RX_DATA_MASK               0xff
>> +
>> +#define I2C_TIMEOUT_MESC             100
>> +#define M_TX_RX_FIFO_SIZE            64
>> +
>> +enum bus_speed_index {
>> +	I2C_SPD_100K = 0,
>> +	I2C_SPD_400K,
>> +};
>> +
>> +struct bcm_iproc_i2c_dev {
>> +	struct device *device;
>> +	int irq;
>> +
>> +	void __iomem *base;
>> +
>> +	struct i2c_adapter adapter;
>> +
>> +	struct completion done;
>> +	int xfer_is_done;
>> +};
>> +
>> +/*
>> + * Can be expanded in the future if more interrupt status bits are utilized
>> + */
>> +#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
>> +
>> +static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
>> +{
>> +	struct bcm_iproc_i2c_dev *iproc_i2c = data;
>> +	u32 status = readl(iproc_i2c->base + IS_OFFSET);
>> +
>> +	status &= ISR_MASK;
>> +
>> +	if (!status)
>> +		return IRQ_NONE;
>> +
>> +	writel(status, iproc_i2c->base + IS_OFFSET);
>> +	iproc_i2c->xfer_is_done = 1;
>> +	complete_all(&iproc_i2c->done);
>> +
>> +	return IRQ_HANDLED;
>> +}
>> +
>> +static bool bcm_iproc_i2c_bus_busy(struct bcm_iproc_i2c_dev *iproc_i2c)
>> +{
>> +	if (readl(iproc_i2c->base + M_CMD_OFFSET) &
>> +	    (1 << M_CMD_START_BUSY_SHIFT))
>> +		return true;
>> +	else
>> +		return false;
>> +}
>> +
>> +static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *iproc_i2c,
>> +				     struct i2c_msg *msg, u8 *addr)
>> +{
>> +
>> +	if (msg->flags & I2C_M_TEN) {
>> +		dev_err(iproc_i2c->device, "no support for 10-bit address\n");
>> +		return -EINVAL;
>> +	}
> 
> This looks harmless, but might be redundant since you aren't advertising I2C_FUNC_10BIT_ADDR anyway.
> 

Okay I'll remove that.

>> +
>> +	*addr = msg->addr << 1;
>> +
>> +	if (msg->flags & I2C_M_RD)
>> +		*addr |= 1;
>> +
>> +	return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *iproc_i2c,
>> +				      struct i2c_msg *msg)
>> +{
>> +	u32 val;
>> +
>> +	val = readl(iproc_i2c->base + M_CMD_OFFSET);
>> +	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
>> +
>> +	switch (val) {
>> +	case M_CMD_STATUS_SUCCESS:
>> +		return 0;
>> +
>> +	case M_CMD_STATUS_LOST_ARB:
>> +		dev_dbg(iproc_i2c->device, "lost bus arbitration\n");
>> +		return -EAGAIN;
>> +
>> +	case M_CMD_STATUS_NACK_ADDR:
>> +		dev_dbg(iproc_i2c->device, "NAK addr:0x%02x\n", msg->addr);
>> +		return -ENXIO;
>> +
>> +	case M_CMD_STATUS_NACK_DATA:
>> +		dev_dbg(iproc_i2c->device, "NAK data\n");
>> +		return -ENXIO;
>> +
>> +	case M_CMD_STATUS_TIMEOUT:
>> +		dev_dbg(iproc_i2c->device, "bus timeout\n");
>> +		return -ETIMEDOUT;
>> +
>> +	default:
>> +		dev_dbg(iproc_i2c->device, "unknown error code=%d\n", val);
>> +		return -EIO;
>> +	}
>> +}
>> +
>> +static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *iproc_i2c,
>> +					 struct i2c_msg *msg)
>> +{
>> +	int ret, i;
>> +	u8 addr;
>> +	u32 val;
>> +	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
>> +
>> +	if (msg->len > M_TX_RX_FIFO_SIZE - 1) {
>> +		dev_err(iproc_i2c->device,
>> +			"only support data length up to %u bytes\n",
>> +			M_TX_RX_FIFO_SIZE - 1);
>> +		return -EINVAL;
>> +	}
> 
> If the FIFO is 64 bytes, are we limited to 63 bytes of data because the slave address consumes 1 byte of FIFO space?  If so, it might be helpful to add a comment to that effect.
> 
Yeah I'll add a comment to explain this.

>> +
>> +	if (bcm_iproc_i2c_bus_busy(iproc_i2c)) {
>> +		dev_warn(iproc_i2c->device, "bus is busy\n");
>> +		return -EBUSY;
>> +	}
>> +
>> +	ret = bcm_iproc_i2c_format_addr(iproc_i2c, msg, &addr);
>> +	if (ret)
>> +		return ret;
>> +
>> +	/* load slave address into the TX FIFO */
>> +	writel(addr, iproc_i2c->base + M_TX_OFFSET);
>> +
>> +	/* for a write transaction, load data into the TX FIFO */
>> +	if (!(msg->flags & I2C_M_RD)) {
>> +		for (i = 0; i < msg->len; i++) {
>> +			val = msg->buf[i];
>> +
>> +			/* mark the last byte */
>> +			if (i == msg->len - 1)
>> +				val |= 1 << M_TX_WR_STATUS_SHIFT;
>> +
>> +			writel(val, iproc_i2c->base + M_TX_OFFSET);
>> +		}
> 
> If msg->len == 1 and msg->buf[0] == 0x00, we will writel(0x80000000, iproc_i2c->base + M_TX_OFFSET);
> 
>> +
>> +		if (msg->len == 0)
>> +			writel(1 << M_TX_WR_STATUS_SHIFT,
>> +			       iproc_i2c->base + M_TX_OFFSET);
> 
> ...so if msg->len == 0, does that mean this sends a dummy 0x00 data byte out on the wire?
> 
> If that's a hardware limitation (M_TX_WR_STATUS_SHIFT prohibited on the address byte), it's probably worth leaving a note in the code.
> 

In fact, I made a mistake here. The if statement should be completely
removed. Thanks for catching this!

>> +	}
>> +
>> +	/* mark as incomplete before starting the transaction */
>> +	reinit_completion(&iproc_i2c->done);
>> +	iproc_i2c->xfer_is_done = 0;
>> +
>> +	/*
>> +	 * Enable the "start busy" interrupt, which will be triggered after the
>> +	 * transaction is done, i.e., the internal start_busy bit, transitions
>> +	 * from 1 to 0.
>> +	 */
>> +	writel(1 << IE_M_START_BUSY_SHIFT, iproc_i2c->base + IE_OFFSET);
>> +
>> +	/*
>> +	 * Now we can activate the transfer. For a read operation, specify the
>> +	 * number of bytes to read
>> +	 */
>> +	val = 1 << M_CMD_START_BUSY_SHIFT;
>> +	if (msg->flags & I2C_M_RD) {
>> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
>> +		       (msg->len << M_CMD_RD_CNT_SHIFT);
>> +	} else {
>> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
>> +	}
>> +	writel(val, iproc_i2c->base + M_CMD_OFFSET);
>> +
>> +	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
>> +
>> +	/* disable all interrupts */
>> +	writel(0, iproc_i2c->base + IE_OFFSET);
>> +	/* read it back to flush the write */
>> +	readl(iproc_i2c->base + IE_OFFSET);
>> +
>> +	/* make sure the interrupt handler isn't running */
>> +	synchronize_irq(iproc_i2c->irq);
>> +
>> +	if (!time_left && !iproc_i2c->xfer_is_done) {
>> +		dev_err(iproc_i2c->device, "transaction timed out\n");
>> +
>> +		/* flush FIFOs */
>> +		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
>> +		      (1 << M_FIFO_TX_FLUSH_SHIFT);
>> +		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
>> +		return -ETIMEDOUT;
>> +	}
>> +
>> +	ret = bcm_iproc_i2c_check_status(iproc_i2c, msg);
>> +	if (ret) {
>> +		/* flush both TX/RX FIFOs */
>> +		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
>> +		      (1 << M_FIFO_TX_FLUSH_SHIFT);
>> +		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
>> +		return ret;
>> +	}
>> +
>> +	/*
>> +	 * For a read operation, we now need to load the data from FIFO
>> +	 * into the memory buffer
>> +	 */
>> +	if (msg->flags & I2C_M_RD) {
>> +		for (i = 0; i < msg->len; i++) {
>> +			msg->buf[i] = (readl(iproc_i2c->base + M_RX_OFFSET) >>
>> +				      M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
>> +		}
>> +	}
>> +
>> +	dev_dbg(iproc_i2c->device, "xfer %c, addr=0x%02x, len=%d\n",
>> +		(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
>> +		msg->len);
>> +	dev_dbg(iproc_i2c->device, "**** data start ****\n");
>> +	for (i = 0; i < msg->len; i++)
>> +		dev_dbg(iproc_i2c->device, "0x%02x ",  msg->buf[i]);
>> +	dev_dbg(iproc_i2c->device, "**** data end ****\n");
> 
> It might be simpler to just do:
> 
>     print_hex_dump_bytes("iproc_i2c:", DUMP_PREFIX_NONE, msg->buf, msg->len);
> 
> although you'd lose the ability to see the I2C device name.
> 

Great! I'll change this to:
dev_dbg(iproc_i2c->device, "*** data: %*ph\n", msg->len, msg->buf);
per discussions between you and Dmitry.

>> +
>> +	return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
>> +			      struct i2c_msg msgs[], int num)
>> +{
>> +	struct bcm_iproc_i2c_dev *iproc_i2c = i2c_get_adapdata(adapter);
>> +	int ret, i;
>> +
>> +	/* go through all messages */
>> +	for (i = 0; i < num; i++) {
>> +		ret = bcm_iproc_i2c_xfer_single_msg(iproc_i2c, &msgs[i]);
>> +		if (ret) {
>> +			dev_err(iproc_i2c->device, "xfer failed\n");
>> +			return ret;
>> +		}
>> +	}
>> +
>> +	return num;
>> +}
>> +
>> +static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
>> +{
>> +	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
>> +}
>> +
>> +static const struct i2c_algorithm bcm_iproc_algo = {
>> +	.master_xfer = bcm_iproc_i2c_xfer,
>> +	.functionality = bcm_iproc_i2c_functionality,
>> +};
>> +
>> +static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
>> +{
>> +	unsigned int bus_speed, speed_bit;
>> +	u32 val;
>> +	int ret = of_property_read_u32(iproc_i2c->device->of_node,
>> +				       "clock-frequency", &bus_speed);
>> +	if (ret < 0) {
>> +		dev_info(iproc_i2c->device,
>> +			"unable to interpret clock-frequency DT property\n");
>> +		bus_speed = 100000;
>> +	}
>> +
>> +	if (bus_speed < 100000) {
>> +		dev_err(iproc_i2c->device, "%d Hz bus speed not supported\n",
>> +			bus_speed);
>> +		dev_err(iproc_i2c->device,
>> +			"valid speeds are 100khz and 400khz\n");
>> +		return -EINVAL;
>> +	} else if (bus_speed < 400000) {
>> +		speed_bit = 0;
>> +	} else {
>> +		/* bus_speed >= 400000 */
>> +		speed_bit = 1;
>> +	}
>> +
>> +	val = readl(iproc_i2c->base + TIM_CFG_OFFSET);
>> +	val &= ~(1 << TIM_CFG_MODE_400_SHIFT);
>> +	val |= speed_bit << TIM_CFG_MODE_400_SHIFT;
>> +	writel(val, iproc_i2c->base + TIM_CFG_OFFSET);
>> +
>> +	dev_info(iproc_i2c->device, "bus set to %u Hz\n", bus_speed);
> 
> The message would be more accurate if it reported 100 kHz or 400 kHz, since the driver isn't able to support arbitrary speeds.  Somebody could be surprised if they ask for 200 kHz but the transactions run at 100 kHz.
> 
Right. I'll update bus_speed to the real speed that it got set to in the
above code.
>> +
>> +	return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *iproc_i2c)
>> +{
>> +	u32 val;
>> +
>> +	/* put controller in reset */
>> +	val = readl(iproc_i2c->base + CFG_OFFSET);
>> +	val |= 1 << CFG_RESET_SHIFT;
>> +	val &= ~(1 << CFG_EN_SHIFT);
>> +	writel(val, iproc_i2c->base + CFG_OFFSET);
>> +
>> +	/* wait 100 usec per spec */
>> +	udelay(100);
>> +
>> +	/* bring controller out of reset */
>> +	val &= ~(1 << CFG_RESET_SHIFT);
>> +	writel(val, iproc_i2c->base + CFG_OFFSET);
>> +
>> +	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
>> +	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
>> +	writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
>> +
>> +	/* disable all interrupts */
>> +	writel(0, iproc_i2c->base + IE_OFFSET);
>> +
>> +	/* clear all pending interrupts */
>> +	writel(0xffffffff, iproc_i2c->base + IS_OFFSET);
>> +
>> +	return 0;
>> +}
>> +
>> +static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *iproc_i2c)
>> +{
>> +	u32 val;
>> +
>> +	val = readl(iproc_i2c->base + CFG_OFFSET);
>> +	val |= 1 << CFG_EN_SHIFT;
>> +	writel(val, iproc_i2c->base + CFG_OFFSET);
>> +}
>> +
>> +static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *iproc_i2c)
>> +{
>> +	u32 val;
>> +
>> +	val = readl(iproc_i2c->base + CFG_OFFSET);
>> +	val &= ~(1 << CFG_EN_SHIFT);
>> +	writel(val, iproc_i2c->base + CFG_OFFSET);
>> +}
>> +
>> +static int bcm_iproc_i2c_probe(struct platform_device *pdev)
>> +{
>> +	int irq, ret = 0;
>> +	struct bcm_iproc_i2c_dev *iproc_i2c;
>> +	struct i2c_adapter *adap;
>> +	struct resource *res;
>> +
>> +	iproc_i2c = devm_kzalloc(&pdev->dev, sizeof(*iproc_i2c),
>> +				 GFP_KERNEL);
>> +	if (!iproc_i2c)
>> +		return -ENOMEM;
>> +
>> +	platform_set_drvdata(pdev, iproc_i2c);
>> +	iproc_i2c->device = &pdev->dev;
>> +	init_completion(&iproc_i2c->done);
>> +
>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +	iproc_i2c->base = devm_ioremap_resource(iproc_i2c->device, res);
>> +	if (IS_ERR(iproc_i2c->base))
>> +		return PTR_ERR(iproc_i2c->base);
>> +
>> +	ret = bcm_iproc_i2c_init(iproc_i2c);
>> +	if (ret)
>> +		return ret;
>> +
>> +	ret = bcm_iproc_i2c_cfg_speed(iproc_i2c);
>> +	if (ret)
>> +		return ret;
>> +
>> +	irq = platform_get_irq(pdev, 0);
>> +	if (irq <= 0) {
>> +		dev_err(iproc_i2c->device, "no irq resource\n");
>> +		return irq;
>> +	}
> 
> AFAICT platform_get_irq() can return IRQ 0 on success.  Unlike irq_of_parse_and_map().
>
In fact, irq_create_of_mapping (platform_get_irq -> of_irq_get ->
irq_create_of_mapping) can return 0 when failed.


> Other than that it looks fine to me, so for all three patches in the series:
> 
> Reviewed-by: Kevin Cernekee <cernekee@chromium.org>
> 
> 
Thank you so much for the review!

>> +	iproc_i2c->irq = irq;
>> +
>> +	ret = devm_request_irq(iproc_i2c->device, irq, bcm_iproc_i2c_isr, 0,
>> +			       pdev->name, iproc_i2c);
>> +	if (ret < 0) {
>> +		dev_err(iproc_i2c->device, "unable to request irq %i\n", irq);
>> +		return ret;
>> +	}
>> +
>> +	bcm_iproc_i2c_enable(iproc_i2c);
>> +
>> +	adap = &iproc_i2c->adapter;
>> +	i2c_set_adapdata(adap, iproc_i2c);
>> +	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
>> +	adap->algo = &bcm_iproc_algo;
>> +	adap->dev.parent = &pdev->dev;
>> +	adap->dev.of_node = pdev->dev.of_node;
>> +
>> +	ret = i2c_add_adapter(adap);
>> +	if (ret) {
>> +		dev_err(iproc_i2c->device, "failed to add adapter\n");
>> +		return ret;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
>> +{
>> +	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
>> +
>> +	/* make sure there's no pending interrupt when we remove the adapter */
>> +	writel(0, iproc_i2c->base + IE_OFFSET);
>> +	readl(iproc_i2c->base + IE_OFFSET);
>> +	synchronize_irq(iproc_i2c->irq);
>> +
>> +	i2c_del_adapter(&iproc_i2c->adapter);
>> +	bcm_iproc_i2c_disable(iproc_i2c);
>> +
>> +	return 0;
>> +}
>> +
>> +static const struct of_device_id bcm_iproc_i2c_of_match[] = {
>> +	{ .compatible = "brcm,iproc-i2c" },
>> +	{ /* sentinel */ }
>> +};
>> +MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
>> +
>> +static struct platform_driver bcm_iproc_i2c_driver = {
>> +	.driver = {
>> +		.name = "bcm-iproc-i2c",
>> +		.of_match_table = bcm_iproc_i2c_of_match,
>> +	},
>> +	.probe = bcm_iproc_i2c_probe,
>> +	.remove = bcm_iproc_i2c_remove,
>> +};
>> +module_platform_driver(bcm_iproc_i2c_driver);
>> +
>> +MODULE_AUTHOR("Ray Jui <rjui <at> broadcom.com>");
>> +MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
>> +MODULE_LICENSE("GPL v2");

Re: [v7,2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 2/6/2015 2:31 PM, Kevin Cernekee wrote:
> On Mon, Jan 19, 2015 at 01:51:49PM -0800, Ray Jui wrote:
>> Add initial support to the Broadcom iProc I2C controller found in the
>> iProc family of SoCs.
>>
>> The iProc I2C controller has separate internal TX and RX FIFOs, each has
>> a size of 64 bytes. The iProc I2C controller supports two bus speeds
>> including standard mode (100kHz) and fast mode (400kHz)
>>
>> Signed-off-by: Ray Jui <rjui <at> broadcom.com>
>> Reviewed-by: Scott Branden <sbranden <at> broadcom.com>
>> ---
>>  drivers/i2c/busses/Kconfig         |   10 +
>>  drivers/i2c/busses/Makefile        |    1 +
>>  drivers/i2c/busses/i2c-bcm-iproc.c |  505 ++++++++++++++++++++++++++++++++++++
>>  3 files changed, 516 insertions(+)
>>  create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c
>>
>> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
>> index 31e8308..af76d23 100644
>> --- a/drivers/i2c/busses/Kconfig
>> +++ b/drivers/i2c/busses/Kconfig
>>  <at>  <at>  -372,6 +372,16  <at>  <at>  config I2C_BCM2835
>>  	  This support is also available as a module.  If so, the module
>>  	  will be called i2c-bcm2835.
>>
>> +config I2C_BCM_IPROC
>> +	tristate "Broadcom iProc I2C controller"
>> +	depends on ARCH_BCM_IPROC || COMPILE_TEST
>> +	default ARCH_BCM_IPROC
>> +	help
>> +	  If you say yes to this option, support will be included for the
>> +	  Broadcom iProc I2C controller.
>> +
>> +	  If you don't know what to do here, say N.
>> +
>>  config I2C_BCM_KONA
>>  	tristate "BCM Kona I2C adapter"
>>  	depends on ARCH_BCM_MOBILE
>> diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
>> index 56388f6..d93b509 100644
>> --- a/drivers/i2c/busses/Makefile
>> +++ b/drivers/i2c/busses/Makefile
>>  <at>  <at>  -33,6 +33,7  <at>  <at>  obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
>>  obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
>>  obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
>>  obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
>> +obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
>>  obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
>>  obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
>>  obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
>> diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
>> new file mode 100644
>> index 0000000..64c622f
>> --- /dev/null
>> +++ b/drivers/i2c/busses/i2c-bcm-iproc.c
>>  <at>  <at>  -0,0 +1,505  <at>  <at> 
>> +/*
>> + * Copyright (C) 2014 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/i2c.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/io.h>
>> +#include <linux/slab.h>
>> +#include <linux/delay.h>
>> +
>> +#define CFG_OFFSET                   0x00
>> +#define CFG_RESET_SHIFT              31
>> +#define CFG_EN_SHIFT                 30
>> +#define CFG_M_RETRY_CNT_SHIFT        16
>> +#define CFG_M_RETRY_CNT_MASK         0x0f
>> +
>> +#define TIM_CFG_OFFSET               0x04
>> +#define TIM_CFG_MODE_400_SHIFT       31
>> +
>> +#define M_FIFO_CTRL_OFFSET           0x0c
>> +#define M_FIFO_RX_FLUSH_SHIFT        31
>> +#define M_FIFO_TX_FLUSH_SHIFT        30
>> +#define M_FIFO_RX_CNT_SHIFT          16
>> +#define M_FIFO_RX_CNT_MASK           0x7f
>> +#define M_FIFO_RX_THLD_SHIFT         8
>> +#define M_FIFO_RX_THLD_MASK          0x3f
>> +
>> +#define M_CMD_OFFSET                 0x30
>> +#define M_CMD_START_BUSY_SHIFT       31
>> +#define M_CMD_STATUS_SHIFT           25
>> +#define M_CMD_STATUS_MASK            0x07
>> +#define M_CMD_STATUS_SUCCESS         0x0
>> +#define M_CMD_STATUS_LOST_ARB        0x1
>> +#define M_CMD_STATUS_NACK_ADDR       0x2
>> +#define M_CMD_STATUS_NACK_DATA       0x3
>> +#define M_CMD_STATUS_TIMEOUT         0x4
>> +#define M_CMD_PROTOCOL_SHIFT         9
>> +#define M_CMD_PROTOCOL_MASK          0xf
>> +#define M_CMD_PROTOCOL_BLK_WR        0x7
>> +#define M_CMD_PROTOCOL_BLK_RD        0x8
>> +#define M_CMD_PEC_SHIFT              8
>> +#define M_CMD_RD_CNT_SHIFT           0
>> +#define M_CMD_RD_CNT_MASK            0xff
>> +
>> +#define IE_OFFSET                    0x38
>> +#define IE_M_RX_FIFO_FULL_SHIFT      31
>> +#define IE_M_RX_THLD_SHIFT           30
>> +#define IE_M_START_BUSY_SHIFT        28
>> +
>> +#define IS_OFFSET                    0x3c
>> +#define IS_M_RX_FIFO_FULL_SHIFT      31
>> +#define IS_M_RX_THLD_SHIFT           30
>> +#define IS_M_START_BUSY_SHIFT        28
>> +
>> +#define M_TX_OFFSET                  0x40
>> +#define M_TX_WR_STATUS_SHIFT         31
>> +#define M_TX_DATA_SHIFT              0
>> +#define M_TX_DATA_MASK               0xff
>> +
>> +#define M_RX_OFFSET                  0x44
>> +#define M_RX_STATUS_SHIFT            30
>> +#define M_RX_STATUS_MASK             0x03
>> +#define M_RX_PEC_ERR_SHIFT           29
>> +#define M_RX_DATA_SHIFT              0
>> +#define M_RX_DATA_MASK               0xff
>> +
>> +#define I2C_TIMEOUT_MESC             100
>> +#define M_TX_RX_FIFO_SIZE            64
>> +
>> +enum bus_speed_index {
>> +	I2C_SPD_100K = 0,
>> +	I2C_SPD_400K,
>> +};
>> +
>> +struct bcm_iproc_i2c_dev {
>> +	struct device *device;
>> +	int irq;
>> +
>> +	void __iomem *base;
>> +
>> +	struct i2c_adapter adapter;
>> +
>> +	struct completion done;
>> +	int xfer_is_done;
>> +};
>> +
>> +/*
>> + * Can be expanded in the future if more interrupt status bits are utilized
>> + */
>> +#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
>> +
>> +static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
>> +{
>> +	struct bcm_iproc_i2c_dev *iproc_i2c = data;
>> +	u32 status = readl(iproc_i2c->base + IS_OFFSET);
>> +
>> +	status &= ISR_MASK;
>> +
>> +	if (!status)
>> +		return IRQ_NONE;
>> +
>> +	writel(status, iproc_i2c->base + IS_OFFSET);
>> +	iproc_i2c->xfer_is_done = 1;
>> +	complete_all(&iproc_i2c->done);
>> +
>> +	return IRQ_HANDLED;
>> +}
>> +
>> +static bool bcm_iproc_i2c_bus_busy(struct bcm_iproc_i2c_dev *iproc_i2c)
>> +{
>> +	if (readl(iproc_i2c->base + M_CMD_OFFSET) &
>> +	    (1 << M_CMD_START_BUSY_SHIFT))
>> +		return true;
>> +	else
>> +		return false;
>> +}
>> +
>> +static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *iproc_i2c,
>> +				     struct i2c_msg *msg, u8 *addr)
>> +{
>> +
>> +	if (msg->flags & I2C_M_TEN) {
>> +		dev_err(iproc_i2c->device, "no support for 10-bit address\n");
>> +		return -EINVAL;
>> +	}
> 
> This looks harmless, but might be redundant since you aren't advertising I2C_FUNC_10BIT_ADDR anyway.
> 

Okay I'll remove that.

>> +
>> +	*addr = msg->addr << 1;
>> +
>> +	if (msg->flags & I2C_M_RD)
>> +		*addr |= 1;
>> +
>> +	return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *iproc_i2c,
>> +				      struct i2c_msg *msg)
>> +{
>> +	u32 val;
>> +
>> +	val = readl(iproc_i2c->base + M_CMD_OFFSET);
>> +	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
>> +
>> +	switch (val) {
>> +	case M_CMD_STATUS_SUCCESS:
>> +		return 0;
>> +
>> +	case M_CMD_STATUS_LOST_ARB:
>> +		dev_dbg(iproc_i2c->device, "lost bus arbitration\n");
>> +		return -EAGAIN;
>> +
>> +	case M_CMD_STATUS_NACK_ADDR:
>> +		dev_dbg(iproc_i2c->device, "NAK addr:0x%02x\n", msg->addr);
>> +		return -ENXIO;
>> +
>> +	case M_CMD_STATUS_NACK_DATA:
>> +		dev_dbg(iproc_i2c->device, "NAK data\n");
>> +		return -ENXIO;
>> +
>> +	case M_CMD_STATUS_TIMEOUT:
>> +		dev_dbg(iproc_i2c->device, "bus timeout\n");
>> +		return -ETIMEDOUT;
>> +
>> +	default:
>> +		dev_dbg(iproc_i2c->device, "unknown error code=%d\n", val);
>> +		return -EIO;
>> +	}
>> +}
>> +
>> +static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *iproc_i2c,
>> +					 struct i2c_msg *msg)
>> +{
>> +	int ret, i;
>> +	u8 addr;
>> +	u32 val;
>> +	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
>> +
>> +	if (msg->len > M_TX_RX_FIFO_SIZE - 1) {
>> +		dev_err(iproc_i2c->device,
>> +			"only support data length up to %u bytes\n",
>> +			M_TX_RX_FIFO_SIZE - 1);
>> +		return -EINVAL;
>> +	}
> 
> If the FIFO is 64 bytes, are we limited to 63 bytes of data because the slave address consumes 1 byte of FIFO space?  If so, it might be helpful to add a comment to that effect.
> 
Yeah I'll add a comment to explain this.

>> +
>> +	if (bcm_iproc_i2c_bus_busy(iproc_i2c)) {
>> +		dev_warn(iproc_i2c->device, "bus is busy\n");
>> +		return -EBUSY;
>> +	}
>> +
>> +	ret = bcm_iproc_i2c_format_addr(iproc_i2c, msg, &addr);
>> +	if (ret)
>> +		return ret;
>> +
>> +	/* load slave address into the TX FIFO */
>> +	writel(addr, iproc_i2c->base + M_TX_OFFSET);
>> +
>> +	/* for a write transaction, load data into the TX FIFO */
>> +	if (!(msg->flags & I2C_M_RD)) {
>> +		for (i = 0; i < msg->len; i++) {
>> +			val = msg->buf[i];
>> +
>> +			/* mark the last byte */
>> +			if (i == msg->len - 1)
>> +				val |= 1 << M_TX_WR_STATUS_SHIFT;
>> +
>> +			writel(val, iproc_i2c->base + M_TX_OFFSET);
>> +		}
> 
> If msg->len == 1 and msg->buf[0] == 0x00, we will writel(0x80000000, iproc_i2c->base + M_TX_OFFSET);
> 
>> +
>> +		if (msg->len == 0)
>> +			writel(1 << M_TX_WR_STATUS_SHIFT,
>> +			       iproc_i2c->base + M_TX_OFFSET);
> 
> ...so if msg->len == 0, does that mean this sends a dummy 0x00 data byte out on the wire?
> 
> If that's a hardware limitation (M_TX_WR_STATUS_SHIFT prohibited on the address byte), it's probably worth leaving a note in the code.
> 

In fact, I made a mistake here. The if statement should be completely
removed. Thanks for catching this!

>> +	}
>> +
>> +	/* mark as incomplete before starting the transaction */
>> +	reinit_completion(&iproc_i2c->done);
>> +	iproc_i2c->xfer_is_done = 0;
>> +
>> +	/*
>> +	 * Enable the "start busy" interrupt, which will be triggered after the
>> +	 * transaction is done, i.e., the internal start_busy bit, transitions
>> +	 * from 1 to 0.
>> +	 */
>> +	writel(1 << IE_M_START_BUSY_SHIFT, iproc_i2c->base + IE_OFFSET);
>> +
>> +	/*
>> +	 * Now we can activate the transfer. For a read operation, specify the
>> +	 * number of bytes to read
>> +	 */
>> +	val = 1 << M_CMD_START_BUSY_SHIFT;
>> +	if (msg->flags & I2C_M_RD) {
>> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
>> +		       (msg->len << M_CMD_RD_CNT_SHIFT);
>> +	} else {
>> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
>> +	}
>> +	writel(val, iproc_i2c->base + M_CMD_OFFSET);
>> +
>> +	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
>> +
>> +	/* disable all interrupts */
>> +	writel(0, iproc_i2c->base + IE_OFFSET);
>> +	/* read it back to flush the write */
>> +	readl(iproc_i2c->base + IE_OFFSET);
>> +
>> +	/* make sure the interrupt handler isn't running */
>> +	synchronize_irq(iproc_i2c->irq);
>> +
>> +	if (!time_left && !iproc_i2c->xfer_is_done) {
>> +		dev_err(iproc_i2c->device, "transaction timed out\n");
>> +
>> +		/* flush FIFOs */
>> +		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
>> +		      (1 << M_FIFO_TX_FLUSH_SHIFT);
>> +		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
>> +		return -ETIMEDOUT;
>> +	}
>> +
>> +	ret = bcm_iproc_i2c_check_status(iproc_i2c, msg);
>> +	if (ret) {
>> +		/* flush both TX/RX FIFOs */
>> +		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
>> +		      (1 << M_FIFO_TX_FLUSH_SHIFT);
>> +		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
>> +		return ret;
>> +	}
>> +
>> +	/*
>> +	 * For a read operation, we now need to load the data from FIFO
>> +	 * into the memory buffer
>> +	 */
>> +	if (msg->flags & I2C_M_RD) {
>> +		for (i = 0; i < msg->len; i++) {
>> +			msg->buf[i] = (readl(iproc_i2c->base + M_RX_OFFSET) >>
>> +				      M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
>> +		}
>> +	}
>> +
>> +	dev_dbg(iproc_i2c->device, "xfer %c, addr=0x%02x, len=%d\n",
>> +		(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
>> +		msg->len);
>> +	dev_dbg(iproc_i2c->device, "**** data start ****\n");
>> +	for (i = 0; i < msg->len; i++)
>> +		dev_dbg(iproc_i2c->device, "0x%02x ",  msg->buf[i]);
>> +	dev_dbg(iproc_i2c->device, "**** data end ****\n");
> 
> It might be simpler to just do:
> 
>     print_hex_dump_bytes("iproc_i2c:", DUMP_PREFIX_NONE, msg->buf, msg->len);
> 
> although you'd lose the ability to see the I2C device name.
> 

Great! I'll change this to:
dev_dbg(iproc_i2c->device, "*** data: %*ph\n", msg->len, msg->buf);
per discussions between you and Dmitry.

>> +
>> +	return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
>> +			      struct i2c_msg msgs[], int num)
>> +{
>> +	struct bcm_iproc_i2c_dev *iproc_i2c = i2c_get_adapdata(adapter);
>> +	int ret, i;
>> +
>> +	/* go through all messages */
>> +	for (i = 0; i < num; i++) {
>> +		ret = bcm_iproc_i2c_xfer_single_msg(iproc_i2c, &msgs[i]);
>> +		if (ret) {
>> +			dev_err(iproc_i2c->device, "xfer failed\n");
>> +			return ret;
>> +		}
>> +	}
>> +
>> +	return num;
>> +}
>> +
>> +static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
>> +{
>> +	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
>> +}
>> +
>> +static const struct i2c_algorithm bcm_iproc_algo = {
>> +	.master_xfer = bcm_iproc_i2c_xfer,
>> +	.functionality = bcm_iproc_i2c_functionality,
>> +};
>> +
>> +static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
>> +{
>> +	unsigned int bus_speed, speed_bit;
>> +	u32 val;
>> +	int ret = of_property_read_u32(iproc_i2c->device->of_node,
>> +				       "clock-frequency", &bus_speed);
>> +	if (ret < 0) {
>> +		dev_info(iproc_i2c->device,
>> +			"unable to interpret clock-frequency DT property\n");
>> +		bus_speed = 100000;
>> +	}
>> +
>> +	if (bus_speed < 100000) {
>> +		dev_err(iproc_i2c->device, "%d Hz bus speed not supported\n",
>> +			bus_speed);
>> +		dev_err(iproc_i2c->device,
>> +			"valid speeds are 100khz and 400khz\n");
>> +		return -EINVAL;
>> +	} else if (bus_speed < 400000) {
>> +		speed_bit = 0;
>> +	} else {
>> +		/* bus_speed >= 400000 */
>> +		speed_bit = 1;
>> +	}
>> +
>> +	val = readl(iproc_i2c->base + TIM_CFG_OFFSET);
>> +	val &= ~(1 << TIM_CFG_MODE_400_SHIFT);
>> +	val |= speed_bit << TIM_CFG_MODE_400_SHIFT;
>> +	writel(val, iproc_i2c->base + TIM_CFG_OFFSET);
>> +
>> +	dev_info(iproc_i2c->device, "bus set to %u Hz\n", bus_speed);
> 
> The message would be more accurate if it reported 100 kHz or 400 kHz, since the driver isn't able to support arbitrary speeds.  Somebody could be surprised if they ask for 200 kHz but the transactions run at 100 kHz.
> 
Right. I'll update bus_speed to the real speed that it got set to in the
above code.
>> +
>> +	return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *iproc_i2c)
>> +{
>> +	u32 val;
>> +
>> +	/* put controller in reset */
>> +	val = readl(iproc_i2c->base + CFG_OFFSET);
>> +	val |= 1 << CFG_RESET_SHIFT;
>> +	val &= ~(1 << CFG_EN_SHIFT);
>> +	writel(val, iproc_i2c->base + CFG_OFFSET);
>> +
>> +	/* wait 100 usec per spec */
>> +	udelay(100);
>> +
>> +	/* bring controller out of reset */
>> +	val &= ~(1 << CFG_RESET_SHIFT);
>> +	writel(val, iproc_i2c->base + CFG_OFFSET);
>> +
>> +	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
>> +	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
>> +	writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
>> +
>> +	/* disable all interrupts */
>> +	writel(0, iproc_i2c->base + IE_OFFSET);
>> +
>> +	/* clear all pending interrupts */
>> +	writel(0xffffffff, iproc_i2c->base + IS_OFFSET);
>> +
>> +	return 0;
>> +}
>> +
>> +static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *iproc_i2c)
>> +{
>> +	u32 val;
>> +
>> +	val = readl(iproc_i2c->base + CFG_OFFSET);
>> +	val |= 1 << CFG_EN_SHIFT;
>> +	writel(val, iproc_i2c->base + CFG_OFFSET);
>> +}
>> +
>> +static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *iproc_i2c)
>> +{
>> +	u32 val;
>> +
>> +	val = readl(iproc_i2c->base + CFG_OFFSET);
>> +	val &= ~(1 << CFG_EN_SHIFT);
>> +	writel(val, iproc_i2c->base + CFG_OFFSET);
>> +}
>> +
>> +static int bcm_iproc_i2c_probe(struct platform_device *pdev)
>> +{
>> +	int irq, ret = 0;
>> +	struct bcm_iproc_i2c_dev *iproc_i2c;
>> +	struct i2c_adapter *adap;
>> +	struct resource *res;
>> +
>> +	iproc_i2c = devm_kzalloc(&pdev->dev, sizeof(*iproc_i2c),
>> +				 GFP_KERNEL);
>> +	if (!iproc_i2c)
>> +		return -ENOMEM;
>> +
>> +	platform_set_drvdata(pdev, iproc_i2c);
>> +	iproc_i2c->device = &pdev->dev;
>> +	init_completion(&iproc_i2c->done);
>> +
>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +	iproc_i2c->base = devm_ioremap_resource(iproc_i2c->device, res);
>> +	if (IS_ERR(iproc_i2c->base))
>> +		return PTR_ERR(iproc_i2c->base);
>> +
>> +	ret = bcm_iproc_i2c_init(iproc_i2c);
>> +	if (ret)
>> +		return ret;
>> +
>> +	ret = bcm_iproc_i2c_cfg_speed(iproc_i2c);
>> +	if (ret)
>> +		return ret;
>> +
>> +	irq = platform_get_irq(pdev, 0);
>> +	if (irq <= 0) {
>> +		dev_err(iproc_i2c->device, "no irq resource\n");
>> +		return irq;
>> +	}
> 
> AFAICT platform_get_irq() can return IRQ 0 on success.  Unlike irq_of_parse_and_map().
>
In fact, irq_create_of_mapping (platform_get_irq -> of_irq_get ->
irq_create_of_mapping) can return 0 when failed.


> Other than that it looks fine to me, so for all three patches in the series:
> 
> Reviewed-by: Kevin Cernekee <cernekee-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
> 
> 
Thank you so much for the review!

>> +	iproc_i2c->irq = irq;
>> +
>> +	ret = devm_request_irq(iproc_i2c->device, irq, bcm_iproc_i2c_isr, 0,
>> +			       pdev->name, iproc_i2c);
>> +	if (ret < 0) {
>> +		dev_err(iproc_i2c->device, "unable to request irq %i\n", irq);
>> +		return ret;
>> +	}
>> +
>> +	bcm_iproc_i2c_enable(iproc_i2c);
>> +
>> +	adap = &iproc_i2c->adapter;
>> +	i2c_set_adapdata(adap, iproc_i2c);
>> +	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
>> +	adap->algo = &bcm_iproc_algo;
>> +	adap->dev.parent = &pdev->dev;
>> +	adap->dev.of_node = pdev->dev.of_node;
>> +
>> +	ret = i2c_add_adapter(adap);
>> +	if (ret) {
>> +		dev_err(iproc_i2c->device, "failed to add adapter\n");
>> +		return ret;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
>> +{
>> +	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
>> +
>> +	/* make sure there's no pending interrupt when we remove the adapter */
>> +	writel(0, iproc_i2c->base + IE_OFFSET);
>> +	readl(iproc_i2c->base + IE_OFFSET);
>> +	synchronize_irq(iproc_i2c->irq);
>> +
>> +	i2c_del_adapter(&iproc_i2c->adapter);
>> +	bcm_iproc_i2c_disable(iproc_i2c);
>> +
>> +	return 0;
>> +}
>> +
>> +static const struct of_device_id bcm_iproc_i2c_of_match[] = {
>> +	{ .compatible = "brcm,iproc-i2c" },
>> +	{ /* sentinel */ }
>> +};
>> +MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
>> +
>> +static struct platform_driver bcm_iproc_i2c_driver = {
>> +	.driver = {
>> +		.name = "bcm-iproc-i2c",
>> +		.of_match_table = bcm_iproc_i2c_of_match,
>> +	},
>> +	.probe = bcm_iproc_i2c_probe,
>> +	.remove = bcm_iproc_i2c_remove,
>> +};
>> +module_platform_driver(bcm_iproc_i2c_driver);
>> +
>> +MODULE_AUTHOR("Ray Jui <rjui <at> broadcom.com>");
>> +MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
>> +MODULE_LICENSE("GPL v2");
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[v7,2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 2/6/2015 2:31 PM, Kevin Cernekee wrote:
> On Mon, Jan 19, 2015 at 01:51:49PM -0800, Ray Jui wrote:
>> Add initial support to the Broadcom iProc I2C controller found in the
>> iProc family of SoCs.
>>
>> The iProc I2C controller has separate internal TX and RX FIFOs, each has
>> a size of 64 bytes. The iProc I2C controller supports two bus speeds
>> including standard mode (100kHz) and fast mode (400kHz)
>>
>> Signed-off-by: Ray Jui <rjui <at> broadcom.com>
>> Reviewed-by: Scott Branden <sbranden <at> broadcom.com>
>> ---
>>  drivers/i2c/busses/Kconfig         |   10 +
>>  drivers/i2c/busses/Makefile        |    1 +
>>  drivers/i2c/busses/i2c-bcm-iproc.c |  505 ++++++++++++++++++++++++++++++++++++
>>  3 files changed, 516 insertions(+)
>>  create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c
>>
>> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
>> index 31e8308..af76d23 100644
>> --- a/drivers/i2c/busses/Kconfig
>> +++ b/drivers/i2c/busses/Kconfig
>>  <at>  <at>  -372,6 +372,16  <at>  <at>  config I2C_BCM2835
>>  	  This support is also available as a module.  If so, the module
>>  	  will be called i2c-bcm2835.
>>
>> +config I2C_BCM_IPROC
>> +	tristate "Broadcom iProc I2C controller"
>> +	depends on ARCH_BCM_IPROC || COMPILE_TEST
>> +	default ARCH_BCM_IPROC
>> +	help
>> +	  If you say yes to this option, support will be included for the
>> +	  Broadcom iProc I2C controller.
>> +
>> +	  If you don't know what to do here, say N.
>> +
>>  config I2C_BCM_KONA
>>  	tristate "BCM Kona I2C adapter"
>>  	depends on ARCH_BCM_MOBILE
>> diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
>> index 56388f6..d93b509 100644
>> --- a/drivers/i2c/busses/Makefile
>> +++ b/drivers/i2c/busses/Makefile
>>  <at>  <at>  -33,6 +33,7  <at>  <at>  obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
>>  obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
>>  obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
>>  obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
>> +obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
>>  obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
>>  obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
>>  obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
>> diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
>> new file mode 100644
>> index 0000000..64c622f
>> --- /dev/null
>> +++ b/drivers/i2c/busses/i2c-bcm-iproc.c
>>  <at>  <at>  -0,0 +1,505  <at>  <at> 
>> +/*
>> + * Copyright (C) 2014 Broadcom Corporation
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation version 2.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether express or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/i2c.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/io.h>
>> +#include <linux/slab.h>
>> +#include <linux/delay.h>
>> +
>> +#define CFG_OFFSET                   0x00
>> +#define CFG_RESET_SHIFT              31
>> +#define CFG_EN_SHIFT                 30
>> +#define CFG_M_RETRY_CNT_SHIFT        16
>> +#define CFG_M_RETRY_CNT_MASK         0x0f
>> +
>> +#define TIM_CFG_OFFSET               0x04
>> +#define TIM_CFG_MODE_400_SHIFT       31
>> +
>> +#define M_FIFO_CTRL_OFFSET           0x0c
>> +#define M_FIFO_RX_FLUSH_SHIFT        31
>> +#define M_FIFO_TX_FLUSH_SHIFT        30
>> +#define M_FIFO_RX_CNT_SHIFT          16
>> +#define M_FIFO_RX_CNT_MASK           0x7f
>> +#define M_FIFO_RX_THLD_SHIFT         8
>> +#define M_FIFO_RX_THLD_MASK          0x3f
>> +
>> +#define M_CMD_OFFSET                 0x30
>> +#define M_CMD_START_BUSY_SHIFT       31
>> +#define M_CMD_STATUS_SHIFT           25
>> +#define M_CMD_STATUS_MASK            0x07
>> +#define M_CMD_STATUS_SUCCESS         0x0
>> +#define M_CMD_STATUS_LOST_ARB        0x1
>> +#define M_CMD_STATUS_NACK_ADDR       0x2
>> +#define M_CMD_STATUS_NACK_DATA       0x3
>> +#define M_CMD_STATUS_TIMEOUT         0x4
>> +#define M_CMD_PROTOCOL_SHIFT         9
>> +#define M_CMD_PROTOCOL_MASK          0xf
>> +#define M_CMD_PROTOCOL_BLK_WR        0x7
>> +#define M_CMD_PROTOCOL_BLK_RD        0x8
>> +#define M_CMD_PEC_SHIFT              8
>> +#define M_CMD_RD_CNT_SHIFT           0
>> +#define M_CMD_RD_CNT_MASK            0xff
>> +
>> +#define IE_OFFSET                    0x38
>> +#define IE_M_RX_FIFO_FULL_SHIFT      31
>> +#define IE_M_RX_THLD_SHIFT           30
>> +#define IE_M_START_BUSY_SHIFT        28
>> +
>> +#define IS_OFFSET                    0x3c
>> +#define IS_M_RX_FIFO_FULL_SHIFT      31
>> +#define IS_M_RX_THLD_SHIFT           30
>> +#define IS_M_START_BUSY_SHIFT        28
>> +
>> +#define M_TX_OFFSET                  0x40
>> +#define M_TX_WR_STATUS_SHIFT         31
>> +#define M_TX_DATA_SHIFT              0
>> +#define M_TX_DATA_MASK               0xff
>> +
>> +#define M_RX_OFFSET                  0x44
>> +#define M_RX_STATUS_SHIFT            30
>> +#define M_RX_STATUS_MASK             0x03
>> +#define M_RX_PEC_ERR_SHIFT           29
>> +#define M_RX_DATA_SHIFT              0
>> +#define M_RX_DATA_MASK               0xff
>> +
>> +#define I2C_TIMEOUT_MESC             100
>> +#define M_TX_RX_FIFO_SIZE            64
>> +
>> +enum bus_speed_index {
>> +	I2C_SPD_100K = 0,
>> +	I2C_SPD_400K,
>> +};
>> +
>> +struct bcm_iproc_i2c_dev {
>> +	struct device *device;
>> +	int irq;
>> +
>> +	void __iomem *base;
>> +
>> +	struct i2c_adapter adapter;
>> +
>> +	struct completion done;
>> +	int xfer_is_done;
>> +};
>> +
>> +/*
>> + * Can be expanded in the future if more interrupt status bits are utilized
>> + */
>> +#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
>> +
>> +static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
>> +{
>> +	struct bcm_iproc_i2c_dev *iproc_i2c = data;
>> +	u32 status = readl(iproc_i2c->base + IS_OFFSET);
>> +
>> +	status &= ISR_MASK;
>> +
>> +	if (!status)
>> +		return IRQ_NONE;
>> +
>> +	writel(status, iproc_i2c->base + IS_OFFSET);
>> +	iproc_i2c->xfer_is_done = 1;
>> +	complete_all(&iproc_i2c->done);
>> +
>> +	return IRQ_HANDLED;
>> +}
>> +
>> +static bool bcm_iproc_i2c_bus_busy(struct bcm_iproc_i2c_dev *iproc_i2c)
>> +{
>> +	if (readl(iproc_i2c->base + M_CMD_OFFSET) &
>> +	    (1 << M_CMD_START_BUSY_SHIFT))
>> +		return true;
>> +	else
>> +		return false;
>> +}
>> +
>> +static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *iproc_i2c,
>> +				     struct i2c_msg *msg, u8 *addr)
>> +{
>> +
>> +	if (msg->flags & I2C_M_TEN) {
>> +		dev_err(iproc_i2c->device, "no support for 10-bit address\n");
>> +		return -EINVAL;
>> +	}
> 
> This looks harmless, but might be redundant since you aren't advertising I2C_FUNC_10BIT_ADDR anyway.
> 

Okay I'll remove that.

>> +
>> +	*addr = msg->addr << 1;
>> +
>> +	if (msg->flags & I2C_M_RD)
>> +		*addr |= 1;
>> +
>> +	return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *iproc_i2c,
>> +				      struct i2c_msg *msg)
>> +{
>> +	u32 val;
>> +
>> +	val = readl(iproc_i2c->base + M_CMD_OFFSET);
>> +	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
>> +
>> +	switch (val) {
>> +	case M_CMD_STATUS_SUCCESS:
>> +		return 0;
>> +
>> +	case M_CMD_STATUS_LOST_ARB:
>> +		dev_dbg(iproc_i2c->device, "lost bus arbitration\n");
>> +		return -EAGAIN;
>> +
>> +	case M_CMD_STATUS_NACK_ADDR:
>> +		dev_dbg(iproc_i2c->device, "NAK addr:0x%02x\n", msg->addr);
>> +		return -ENXIO;
>> +
>> +	case M_CMD_STATUS_NACK_DATA:
>> +		dev_dbg(iproc_i2c->device, "NAK data\n");
>> +		return -ENXIO;
>> +
>> +	case M_CMD_STATUS_TIMEOUT:
>> +		dev_dbg(iproc_i2c->device, "bus timeout\n");
>> +		return -ETIMEDOUT;
>> +
>> +	default:
>> +		dev_dbg(iproc_i2c->device, "unknown error code=%d\n", val);
>> +		return -EIO;
>> +	}
>> +}
>> +
>> +static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *iproc_i2c,
>> +					 struct i2c_msg *msg)
>> +{
>> +	int ret, i;
>> +	u8 addr;
>> +	u32 val;
>> +	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
>> +
>> +	if (msg->len > M_TX_RX_FIFO_SIZE - 1) {
>> +		dev_err(iproc_i2c->device,
>> +			"only support data length up to %u bytes\n",
>> +			M_TX_RX_FIFO_SIZE - 1);
>> +		return -EINVAL;
>> +	}
> 
> If the FIFO is 64 bytes, are we limited to 63 bytes of data because the slave address consumes 1 byte of FIFO space?  If so, it might be helpful to add a comment to that effect.
> 
Yeah I'll add a comment to explain this.

>> +
>> +	if (bcm_iproc_i2c_bus_busy(iproc_i2c)) {
>> +		dev_warn(iproc_i2c->device, "bus is busy\n");
>> +		return -EBUSY;
>> +	}
>> +
>> +	ret = bcm_iproc_i2c_format_addr(iproc_i2c, msg, &addr);
>> +	if (ret)
>> +		return ret;
>> +
>> +	/* load slave address into the TX FIFO */
>> +	writel(addr, iproc_i2c->base + M_TX_OFFSET);
>> +
>> +	/* for a write transaction, load data into the TX FIFO */
>> +	if (!(msg->flags & I2C_M_RD)) {
>> +		for (i = 0; i < msg->len; i++) {
>> +			val = msg->buf[i];
>> +
>> +			/* mark the last byte */
>> +			if (i == msg->len - 1)
>> +				val |= 1 << M_TX_WR_STATUS_SHIFT;
>> +
>> +			writel(val, iproc_i2c->base + M_TX_OFFSET);
>> +		}
> 
> If msg->len == 1 and msg->buf[0] == 0x00, we will writel(0x80000000, iproc_i2c->base + M_TX_OFFSET);
> 
>> +
>> +		if (msg->len == 0)
>> +			writel(1 << M_TX_WR_STATUS_SHIFT,
>> +			       iproc_i2c->base + M_TX_OFFSET);
> 
> ...so if msg->len == 0, does that mean this sends a dummy 0x00 data byte out on the wire?
> 
> If that's a hardware limitation (M_TX_WR_STATUS_SHIFT prohibited on the address byte), it's probably worth leaving a note in the code.
> 

In fact, I made a mistake here. The if statement should be completely
removed. Thanks for catching this!

>> +	}
>> +
>> +	/* mark as incomplete before starting the transaction */
>> +	reinit_completion(&iproc_i2c->done);
>> +	iproc_i2c->xfer_is_done = 0;
>> +
>> +	/*
>> +	 * Enable the "start busy" interrupt, which will be triggered after the
>> +	 * transaction is done, i.e., the internal start_busy bit, transitions
>> +	 * from 1 to 0.
>> +	 */
>> +	writel(1 << IE_M_START_BUSY_SHIFT, iproc_i2c->base + IE_OFFSET);
>> +
>> +	/*
>> +	 * Now we can activate the transfer. For a read operation, specify the
>> +	 * number of bytes to read
>> +	 */
>> +	val = 1 << M_CMD_START_BUSY_SHIFT;
>> +	if (msg->flags & I2C_M_RD) {
>> +		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
>> +		       (msg->len << M_CMD_RD_CNT_SHIFT);
>> +	} else {
>> +		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
>> +	}
>> +	writel(val, iproc_i2c->base + M_CMD_OFFSET);
>> +
>> +	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
>> +
>> +	/* disable all interrupts */
>> +	writel(0, iproc_i2c->base + IE_OFFSET);
>> +	/* read it back to flush the write */
>> +	readl(iproc_i2c->base + IE_OFFSET);
>> +
>> +	/* make sure the interrupt handler isn't running */
>> +	synchronize_irq(iproc_i2c->irq);
>> +
>> +	if (!time_left && !iproc_i2c->xfer_is_done) {
>> +		dev_err(iproc_i2c->device, "transaction timed out\n");
>> +
>> +		/* flush FIFOs */
>> +		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
>> +		      (1 << M_FIFO_TX_FLUSH_SHIFT);
>> +		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
>> +		return -ETIMEDOUT;
>> +	}
>> +
>> +	ret = bcm_iproc_i2c_check_status(iproc_i2c, msg);
>> +	if (ret) {
>> +		/* flush both TX/RX FIFOs */
>> +		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
>> +		      (1 << M_FIFO_TX_FLUSH_SHIFT);
>> +		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
>> +		return ret;
>> +	}
>> +
>> +	/*
>> +	 * For a read operation, we now need to load the data from FIFO
>> +	 * into the memory buffer
>> +	 */
>> +	if (msg->flags & I2C_M_RD) {
>> +		for (i = 0; i < msg->len; i++) {
>> +			msg->buf[i] = (readl(iproc_i2c->base + M_RX_OFFSET) >>
>> +				      M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
>> +		}
>> +	}
>> +
>> +	dev_dbg(iproc_i2c->device, "xfer %c, addr=0x%02x, len=%d\n",
>> +		(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
>> +		msg->len);
>> +	dev_dbg(iproc_i2c->device, "**** data start ****\n");
>> +	for (i = 0; i < msg->len; i++)
>> +		dev_dbg(iproc_i2c->device, "0x%02x ",  msg->buf[i]);
>> +	dev_dbg(iproc_i2c->device, "**** data end ****\n");
> 
> It might be simpler to just do:
> 
>     print_hex_dump_bytes("iproc_i2c:", DUMP_PREFIX_NONE, msg->buf, msg->len);
> 
> although you'd lose the ability to see the I2C device name.
> 

Great! I'll change this to:
dev_dbg(iproc_i2c->device, "*** data: %*ph\n", msg->len, msg->buf);
per discussions between you and Dmitry.

>> +
>> +	return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
>> +			      struct i2c_msg msgs[], int num)
>> +{
>> +	struct bcm_iproc_i2c_dev *iproc_i2c = i2c_get_adapdata(adapter);
>> +	int ret, i;
>> +
>> +	/* go through all messages */
>> +	for (i = 0; i < num; i++) {
>> +		ret = bcm_iproc_i2c_xfer_single_msg(iproc_i2c, &msgs[i]);
>> +		if (ret) {
>> +			dev_err(iproc_i2c->device, "xfer failed\n");
>> +			return ret;
>> +		}
>> +	}
>> +
>> +	return num;
>> +}
>> +
>> +static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
>> +{
>> +	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
>> +}
>> +
>> +static const struct i2c_algorithm bcm_iproc_algo = {
>> +	.master_xfer = bcm_iproc_i2c_xfer,
>> +	.functionality = bcm_iproc_i2c_functionality,
>> +};
>> +
>> +static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
>> +{
>> +	unsigned int bus_speed, speed_bit;
>> +	u32 val;
>> +	int ret = of_property_read_u32(iproc_i2c->device->of_node,
>> +				       "clock-frequency", &bus_speed);
>> +	if (ret < 0) {
>> +		dev_info(iproc_i2c->device,
>> +			"unable to interpret clock-frequency DT property\n");
>> +		bus_speed = 100000;
>> +	}
>> +
>> +	if (bus_speed < 100000) {
>> +		dev_err(iproc_i2c->device, "%d Hz bus speed not supported\n",
>> +			bus_speed);
>> +		dev_err(iproc_i2c->device,
>> +			"valid speeds are 100khz and 400khz\n");
>> +		return -EINVAL;
>> +	} else if (bus_speed < 400000) {
>> +		speed_bit = 0;
>> +	} else {
>> +		/* bus_speed >= 400000 */
>> +		speed_bit = 1;
>> +	}
>> +
>> +	val = readl(iproc_i2c->base + TIM_CFG_OFFSET);
>> +	val &= ~(1 << TIM_CFG_MODE_400_SHIFT);
>> +	val |= speed_bit << TIM_CFG_MODE_400_SHIFT;
>> +	writel(val, iproc_i2c->base + TIM_CFG_OFFSET);
>> +
>> +	dev_info(iproc_i2c->device, "bus set to %u Hz\n", bus_speed);
> 
> The message would be more accurate if it reported 100 kHz or 400 kHz, since the driver isn't able to support arbitrary speeds.  Somebody could be surprised if they ask for 200 kHz but the transactions run at 100 kHz.
> 
Right. I'll update bus_speed to the real speed that it got set to in the
above code.
>> +
>> +	return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *iproc_i2c)
>> +{
>> +	u32 val;
>> +
>> +	/* put controller in reset */
>> +	val = readl(iproc_i2c->base + CFG_OFFSET);
>> +	val |= 1 << CFG_RESET_SHIFT;
>> +	val &= ~(1 << CFG_EN_SHIFT);
>> +	writel(val, iproc_i2c->base + CFG_OFFSET);
>> +
>> +	/* wait 100 usec per spec */
>> +	udelay(100);
>> +
>> +	/* bring controller out of reset */
>> +	val &= ~(1 << CFG_RESET_SHIFT);
>> +	writel(val, iproc_i2c->base + CFG_OFFSET);
>> +
>> +	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
>> +	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
>> +	writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
>> +
>> +	/* disable all interrupts */
>> +	writel(0, iproc_i2c->base + IE_OFFSET);
>> +
>> +	/* clear all pending interrupts */
>> +	writel(0xffffffff, iproc_i2c->base + IS_OFFSET);
>> +
>> +	return 0;
>> +}
>> +
>> +static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *iproc_i2c)
>> +{
>> +	u32 val;
>> +
>> +	val = readl(iproc_i2c->base + CFG_OFFSET);
>> +	val |= 1 << CFG_EN_SHIFT;
>> +	writel(val, iproc_i2c->base + CFG_OFFSET);
>> +}
>> +
>> +static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *iproc_i2c)
>> +{
>> +	u32 val;
>> +
>> +	val = readl(iproc_i2c->base + CFG_OFFSET);
>> +	val &= ~(1 << CFG_EN_SHIFT);
>> +	writel(val, iproc_i2c->base + CFG_OFFSET);
>> +}
>> +
>> +static int bcm_iproc_i2c_probe(struct platform_device *pdev)
>> +{
>> +	int irq, ret = 0;
>> +	struct bcm_iproc_i2c_dev *iproc_i2c;
>> +	struct i2c_adapter *adap;
>> +	struct resource *res;
>> +
>> +	iproc_i2c = devm_kzalloc(&pdev->dev, sizeof(*iproc_i2c),
>> +				 GFP_KERNEL);
>> +	if (!iproc_i2c)
>> +		return -ENOMEM;
>> +
>> +	platform_set_drvdata(pdev, iproc_i2c);
>> +	iproc_i2c->device = &pdev->dev;
>> +	init_completion(&iproc_i2c->done);
>> +
>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +	iproc_i2c->base = devm_ioremap_resource(iproc_i2c->device, res);
>> +	if (IS_ERR(iproc_i2c->base))
>> +		return PTR_ERR(iproc_i2c->base);
>> +
>> +	ret = bcm_iproc_i2c_init(iproc_i2c);
>> +	if (ret)
>> +		return ret;
>> +
>> +	ret = bcm_iproc_i2c_cfg_speed(iproc_i2c);
>> +	if (ret)
>> +		return ret;
>> +
>> +	irq = platform_get_irq(pdev, 0);
>> +	if (irq <= 0) {
>> +		dev_err(iproc_i2c->device, "no irq resource\n");
>> +		return irq;
>> +	}
> 
> AFAICT platform_get_irq() can return IRQ 0 on success.  Unlike irq_of_parse_and_map().
>
In fact, irq_create_of_mapping (platform_get_irq -> of_irq_get ->
irq_create_of_mapping) can return 0 when failed.


> Other than that it looks fine to me, so for all three patches in the series:
> 
> Reviewed-by: Kevin Cernekee <cernekee@chromium.org>
> 
> 
Thank you so much for the review!

>> +	iproc_i2c->irq = irq;
>> +
>> +	ret = devm_request_irq(iproc_i2c->device, irq, bcm_iproc_i2c_isr, 0,
>> +			       pdev->name, iproc_i2c);
>> +	if (ret < 0) {
>> +		dev_err(iproc_i2c->device, "unable to request irq %i\n", irq);
>> +		return ret;
>> +	}
>> +
>> +	bcm_iproc_i2c_enable(iproc_i2c);
>> +
>> +	adap = &iproc_i2c->adapter;
>> +	i2c_set_adapdata(adap, iproc_i2c);
>> +	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
>> +	adap->algo = &bcm_iproc_algo;
>> +	adap->dev.parent = &pdev->dev;
>> +	adap->dev.of_node = pdev->dev.of_node;
>> +
>> +	ret = i2c_add_adapter(adap);
>> +	if (ret) {
>> +		dev_err(iproc_i2c->device, "failed to add adapter\n");
>> +		return ret;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static int bcm_iproc_i2c_remove(struct platform_device *pdev)
>> +{
>> +	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
>> +
>> +	/* make sure there's no pending interrupt when we remove the adapter */
>> +	writel(0, iproc_i2c->base + IE_OFFSET);
>> +	readl(iproc_i2c->base + IE_OFFSET);
>> +	synchronize_irq(iproc_i2c->irq);
>> +
>> +	i2c_del_adapter(&iproc_i2c->adapter);
>> +	bcm_iproc_i2c_disable(iproc_i2c);
>> +
>> +	return 0;
>> +}
>> +
>> +static const struct of_device_id bcm_iproc_i2c_of_match[] = {
>> +	{ .compatible = "brcm,iproc-i2c" },
>> +	{ /* sentinel */ }
>> +};
>> +MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
>> +
>> +static struct platform_driver bcm_iproc_i2c_driver = {
>> +	.driver = {
>> +		.name = "bcm-iproc-i2c",
>> +		.of_match_table = bcm_iproc_i2c_of_match,
>> +	},
>> +	.probe = bcm_iproc_i2c_probe,
>> +	.remove = bcm_iproc_i2c_remove,
>> +};
>> +module_platform_driver(bcm_iproc_i2c_driver);
>> +
>> +MODULE_AUTHOR("Ray Jui <rjui <at> broadcom.com>");
>> +MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
>> +MODULE_LICENSE("GPL v2");

[PATCH v8 0/3] Add I2C support to Broadcom iProc

[Ray Jui]

This patchset contains the initial I2C support for Broadcom iProc family of
SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has a
size of 64 bytes. The iProc I2C controller supports two bus speeds including
standard mode (100 kHz) and fast mode (400 kHz)

Changes from v7:
 - Remove redundant 10-bit address check in the driver
 - Fix the driver that accidentally emits 1-byte of data with zero content in
   the case of SMBUS quick command
 - Improve debugging prints in the driver
 - Other minor improvements

Changes from v6:
 - Get rid of unnecessary atomic variable usage in the driver
 - Improve the "waiting for transaction to complete" logic further by making
   sure there's no pending/ongoing interrupt by the time when flag
   'xfer_is_done' is checked
 - After disabling interrupt with 'writel', add 'readl' to the same register
   to flush the bus to ensure the write has gone through

Changes from v5:
 - Improve the "waiting for transaction to be complete" logic to take care of
   the corner case when an interrupt fires after wait_for_completion_timeout
   times out
 - Improve the logic to disable I2C interrupt in the remove function. Make it
   more generic so it works for both dedicated and shared interrupt

Changes from v4:
 - Remove redundant header file includes
 - Change the logic that waits for the host controller to be idle to
   simply return -EBUSY
 - Use proper print level and error codes in the driver
 - Allow zero length message in the driver to support I2C_SMBUS_QUICK
 - Change back to use devm_request_irq. Disable interrupt in the remove
   function so there's no outstanding I2C interrupt when the driver is
   being removed from the framework
 - Other minor miscellaneous improvements and fixes

Changes from v3:
 - Add config dependency to COMPILE_TEST to allow the driver to be build tested
   by other platforms
 - Improve CPU utilization efficiency in the loop of waiting for bus to idle
 - Add more comment in the driver to clarify the way how the "start busy"
   interrupt is triggered from the I2C controller
 - Fix inconsistent coding style and format
 - Improve the bus speed validation logic in the driver
 - Add code to free the interrupt line in driver's remove function. Also
   change to use non-devm API to request the interrupt line
 - Other miscellaneous improvements and fixes

Changes from v2:
 - Have the I2C driver default to y so it does not need to be selected from
   ARCH_BCM_IPROC. This also helps to get rid of one patch. The driver still
   depends on ARCH_BCM_IPROC
 - Get rid of redundant check on resource returned by platform_get_resource

Changes from v1:
 - Fix function argument parenthesis
 - Get rid of redundant driver owner field

Ray Jui (3):
  i2c: iProc: define Broadcom iProc I2C binding
  i2c: iproc: Add Broadcom iProc I2C Driver
  ARM: dts: add I2C device nodes for Broadcom Cygnus

 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   20 +
 drivers/i2c/busses/Kconfig                         |   10 +
 drivers/i2c/busses/Makefile                        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c                 |  494 ++++++++++++++++++++
 5 files changed, 562 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

-- 
1.7.9.5

[PATCH v8 0/3] Add I2C support to Broadcom iProc

[Ray Jui]

This patchset contains the initial I2C support for Broadcom iProc family of
SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has a
size of 64 bytes. The iProc I2C controller supports two bus speeds including
standard mode (100 kHz) and fast mode (400 kHz)

Changes from v7:
 - Remove redundant 10-bit address check in the driver
 - Fix the driver that accidentally emits 1-byte of data with zero content in
   the case of SMBUS quick command
 - Improve debugging prints in the driver
 - Other minor improvements

Changes from v6:
 - Get rid of unnecessary atomic variable usage in the driver
 - Improve the "waiting for transaction to complete" logic further by making
   sure there's no pending/ongoing interrupt by the time when flag
   'xfer_is_done' is checked
 - After disabling interrupt with 'writel', add 'readl' to the same register
   to flush the bus to ensure the write has gone through

Changes from v5:
 - Improve the "waiting for transaction to be complete" logic to take care of
   the corner case when an interrupt fires after wait_for_completion_timeout
   times out
 - Improve the logic to disable I2C interrupt in the remove function. Make it
   more generic so it works for both dedicated and shared interrupt

Changes from v4:
 - Remove redundant header file includes
 - Change the logic that waits for the host controller to be idle to
   simply return -EBUSY
 - Use proper print level and error codes in the driver
 - Allow zero length message in the driver to support I2C_SMBUS_QUICK
 - Change back to use devm_request_irq. Disable interrupt in the remove
   function so there's no outstanding I2C interrupt when the driver is
   being removed from the framework
 - Other minor miscellaneous improvements and fixes

Changes from v3:
 - Add config dependency to COMPILE_TEST to allow the driver to be build tested
   by other platforms
 - Improve CPU utilization efficiency in the loop of waiting for bus to idle
 - Add more comment in the driver to clarify the way how the "start busy"
   interrupt is triggered from the I2C controller
 - Fix inconsistent coding style and format
 - Improve the bus speed validation logic in the driver
 - Add code to free the interrupt line in driver's remove function. Also
   change to use non-devm API to request the interrupt line
 - Other miscellaneous improvements and fixes

Changes from v2:
 - Have the I2C driver default to y so it does not need to be selected from
   ARCH_BCM_IPROC. This also helps to get rid of one patch. The driver still
   depends on ARCH_BCM_IPROC
 - Get rid of redundant check on resource returned by platform_get_resource

Changes from v1:
 - Fix function argument parenthesis
 - Get rid of redundant driver owner field

Ray Jui (3):
  i2c: iProc: define Broadcom iProc I2C binding
  i2c: iproc: Add Broadcom iProc I2C Driver
  ARM: dts: add I2C device nodes for Broadcom Cygnus

 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   20 +
 drivers/i2c/busses/Kconfig                         |   10 +
 drivers/i2c/busses/Makefile                        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c                 |  494 ++++++++++++++++++++
 5 files changed, 562 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

-- 
1.7.9.5

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[PATCH v8 0/3] Add I2C support to Broadcom iProc

[Ray Jui]

This patchset contains the initial I2C support for Broadcom iProc family of
SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has a
size of 64 bytes. The iProc I2C controller supports two bus speeds including
standard mode (100 kHz) and fast mode (400 kHz)

Changes from v7:
 - Remove redundant 10-bit address check in the driver
 - Fix the driver that accidentally emits 1-byte of data with zero content in
   the case of SMBUS quick command
 - Improve debugging prints in the driver
 - Other minor improvements

Changes from v6:
 - Get rid of unnecessary atomic variable usage in the driver
 - Improve the "waiting for transaction to complete" logic further by making
   sure there's no pending/ongoing interrupt by the time when flag
   'xfer_is_done' is checked
 - After disabling interrupt with 'writel', add 'readl' to the same register
   to flush the bus to ensure the write has gone through

Changes from v5:
 - Improve the "waiting for transaction to be complete" logic to take care of
   the corner case when an interrupt fires after wait_for_completion_timeout
   times out
 - Improve the logic to disable I2C interrupt in the remove function. Make it
   more generic so it works for both dedicated and shared interrupt

Changes from v4:
 - Remove redundant header file includes
 - Change the logic that waits for the host controller to be idle to
   simply return -EBUSY
 - Use proper print level and error codes in the driver
 - Allow zero length message in the driver to support I2C_SMBUS_QUICK
 - Change back to use devm_request_irq. Disable interrupt in the remove
   function so there's no outstanding I2C interrupt when the driver is
   being removed from the framework
 - Other minor miscellaneous improvements and fixes

Changes from v3:
 - Add config dependency to COMPILE_TEST to allow the driver to be build tested
   by other platforms
 - Improve CPU utilization efficiency in the loop of waiting for bus to idle
 - Add more comment in the driver to clarify the way how the "start busy"
   interrupt is triggered from the I2C controller
 - Fix inconsistent coding style and format
 - Improve the bus speed validation logic in the driver
 - Add code to free the interrupt line in driver's remove function. Also
   change to use non-devm API to request the interrupt line
 - Other miscellaneous improvements and fixes

Changes from v2:
 - Have the I2C driver default to y so it does not need to be selected from
   ARCH_BCM_IPROC. This also helps to get rid of one patch. The driver still
   depends on ARCH_BCM_IPROC
 - Get rid of redundant check on resource returned by platform_get_resource

Changes from v1:
 - Fix function argument parenthesis
 - Get rid of redundant driver owner field

Ray Jui (3):
  i2c: iProc: define Broadcom iProc I2C binding
  i2c: iproc: Add Broadcom iProc I2C Driver
  ARM: dts: add I2C device nodes for Broadcom Cygnus

 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   20 +
 drivers/i2c/busses/Kconfig                         |   10 +
 drivers/i2c/busses/Makefile                        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c                 |  494 ++++++++++++++++++++
 5 files changed, 562 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

-- 
1.7.9.5

[PATCH v8 1/3] i2c: iProc: define Broadcom iProc I2C binding

[Ray Jui]

Document the I2C device tree binding for Broadcom iProc family of
SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Reviewed-by: Kevin Cernekee <cernekee@chromium.org>
---
 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt

diff --git a/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
new file mode 100644
index 0000000..81f982c
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
@@ -0,0 +1,37 @@
+Broadcom iProc I2C controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,iproc-i2c"
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+    I2C controller registers
+
+- interrupts:
+    Should contain the I2C interrupt
+
+- clock-frequency:
+    This is the I2C bus clock. Need to be either 100000 or 400000
+
+- #address-cells:
+    Always 1 (for I2C addresses)
+
+- #size-cells:
+    Always 0
+
+Example:
+	i2c0: i2c@18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+
+		codec: wm8750@1a {
+			compatible = "wlf,wm8750";
+			reg = <0x1a>;
+		};
+	};
-- 
1.7.9.5

[PATCH v8 1/3] i2c: iProc: define Broadcom iProc I2C binding

[Ray Jui]

Document the I2C device tree binding for Broadcom iProc family of
SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Reviewed-by: Kevin Cernekee <cernekee@chromium.org>
---
 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt

diff --git a/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
new file mode 100644
index 0000000..81f982c
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
@@ -0,0 +1,37 @@
+Broadcom iProc I2C controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,iproc-i2c"
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+    I2C controller registers
+
+- interrupts:
+    Should contain the I2C interrupt
+
+- clock-frequency:
+    This is the I2C bus clock. Need to be either 100000 or 400000
+
+- #address-cells:
+    Always 1 (for I2C addresses)
+
+- #size-cells:
+    Always 0
+
+Example:
+	i2c0: i2c@18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+
+		codec: wm8750@1a {
+			compatible = "wlf,wm8750";
+			reg = <0x1a>;
+		};
+	};
-- 
1.7.9.5

[PATCH v8 1/3] i2c: iProc: define Broadcom iProc I2C binding

[Ray Jui]

Document the I2C device tree binding for Broadcom iProc family of
SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Reviewed-by: Kevin Cernekee <cernekee@chromium.org>
---
 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt

diff --git a/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
new file mode 100644
index 0000000..81f982c
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
@@ -0,0 +1,37 @@
+Broadcom iProc I2C controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,iproc-i2c"
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+    I2C controller registers
+
+- interrupts:
+    Should contain the I2C interrupt
+
+- clock-frequency:
+    This is the I2C bus clock. Need to be either 100000 or 400000
+
+- #address-cells:
+    Always 1 (for I2C addresses)
+
+- #size-cells:
+    Always 0
+
+Example:
+	i2c0: i2c at 18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+
+		codec: wm8750 at 1a {
+			compatible = "wlf,wm8750";
+			reg = <0x1a>;
+		};
+	};
-- 
1.7.9.5

[PATCH v8 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

Add initial support to the Broadcom iProc I2C controller found in the
iProc family of SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has
a size of 64 bytes. The iProc I2C controller supports two bus speeds
including standard mode (100kHz) and fast mode (400kHz)

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Reviewed-by: Kevin Cernekee <cernekee@chromium.org>
---
 drivers/i2c/busses/Kconfig         |   10 +
 drivers/i2c/busses/Makefile        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c |  494 ++++++++++++++++++++++++++++++++++++
 3 files changed, 505 insertions(+)
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index ab838d9..3d08731 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -372,6 +372,16 @@ config I2C_BCM2835
 	  This support is also available as a module.  If so, the module
 	  will be called i2c-bcm2835.
 
+config I2C_BCM_IPROC
+	tristate "Broadcom iProc I2C controller"
+	depends on ARCH_BCM_IPROC || COMPILE_TEST
+	default ARCH_BCM_IPROC
+	help
+	  If you say yes to this option, support will be included for the
+	  Broadcom iProc I2C controller.
+
+	  If you don't know what to do here, say N.
+
 config I2C_BCM_KONA
 	tristate "BCM Kona I2C adapter"
 	depends on ARCH_BCM_MOBILE
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 56388f6..d93b509 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
 obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
 obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
 obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
+obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
 obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
 obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
 obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
new file mode 100644
index 0000000..5d0a03f
--- /dev/null
+++ b/drivers/i2c/busses/i2c-bcm-iproc.c
@@ -0,0 +1,494 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+
+#define CFG_OFFSET                   0x00
+#define CFG_RESET_SHIFT              31
+#define CFG_EN_SHIFT                 30
+#define CFG_M_RETRY_CNT_SHIFT        16
+#define CFG_M_RETRY_CNT_MASK         0x0f
+
+#define TIM_CFG_OFFSET               0x04
+#define TIM_CFG_MODE_400_SHIFT       31
+
+#define M_FIFO_CTRL_OFFSET           0x0c
+#define M_FIFO_RX_FLUSH_SHIFT        31
+#define M_FIFO_TX_FLUSH_SHIFT        30
+#define M_FIFO_RX_CNT_SHIFT          16
+#define M_FIFO_RX_CNT_MASK           0x7f
+#define M_FIFO_RX_THLD_SHIFT         8
+#define M_FIFO_RX_THLD_MASK          0x3f
+
+#define M_CMD_OFFSET                 0x30
+#define M_CMD_START_BUSY_SHIFT       31
+#define M_CMD_STATUS_SHIFT           25
+#define M_CMD_STATUS_MASK            0x07
+#define M_CMD_STATUS_SUCCESS         0x0
+#define M_CMD_STATUS_LOST_ARB        0x1
+#define M_CMD_STATUS_NACK_ADDR       0x2
+#define M_CMD_STATUS_NACK_DATA       0x3
+#define M_CMD_STATUS_TIMEOUT         0x4
+#define M_CMD_PROTOCOL_SHIFT         9
+#define M_CMD_PROTOCOL_MASK          0xf
+#define M_CMD_PROTOCOL_BLK_WR        0x7
+#define M_CMD_PROTOCOL_BLK_RD        0x8
+#define M_CMD_PEC_SHIFT              8
+#define M_CMD_RD_CNT_SHIFT           0
+#define M_CMD_RD_CNT_MASK            0xff
+
+#define IE_OFFSET                    0x38
+#define IE_M_RX_FIFO_FULL_SHIFT      31
+#define IE_M_RX_THLD_SHIFT           30
+#define IE_M_START_BUSY_SHIFT        28
+
+#define IS_OFFSET                    0x3c
+#define IS_M_RX_FIFO_FULL_SHIFT      31
+#define IS_M_RX_THLD_SHIFT           30
+#define IS_M_START_BUSY_SHIFT        28
+
+#define M_TX_OFFSET                  0x40
+#define M_TX_WR_STATUS_SHIFT         31
+#define M_TX_DATA_SHIFT              0
+#define M_TX_DATA_MASK               0xff
+
+#define M_RX_OFFSET                  0x44
+#define M_RX_STATUS_SHIFT            30
+#define M_RX_STATUS_MASK             0x03
+#define M_RX_PEC_ERR_SHIFT           29
+#define M_RX_DATA_SHIFT              0
+#define M_RX_DATA_MASK               0xff
+
+#define I2C_TIMEOUT_MESC             100
+#define M_TX_RX_FIFO_SIZE            64
+
+enum bus_speed_index {
+	I2C_SPD_100K = 0,
+	I2C_SPD_400K,
+};
+
+struct bcm_iproc_i2c_dev {
+	struct device *device;
+	int irq;
+
+	void __iomem *base;
+
+	struct i2c_adapter adapter;
+
+	struct completion done;
+	int xfer_is_done;
+};
+
+/*
+ * Can be expanded in the future if more interrupt status bits are utilized
+ */
+#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
+
+static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = data;
+	u32 status = readl(iproc_i2c->base + IS_OFFSET);
+
+	status &= ISR_MASK;
+
+	if (!status)
+		return IRQ_NONE;
+
+	writel(status, iproc_i2c->base + IS_OFFSET);
+	iproc_i2c->xfer_is_done = 1;
+	complete_all(&iproc_i2c->done);
+
+	return IRQ_HANDLED;
+}
+
+static bool bcm_iproc_i2c_bus_busy(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	if (readl(iproc_i2c->base + M_CMD_OFFSET) &
+	    (1 << M_CMD_START_BUSY_SHIFT))
+		return true;
+	else
+		return false;
+}
+
+static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *iproc_i2c,
+				     struct i2c_msg *msg, u8 *addr)
+{
+	*addr = msg->addr << 1;
+
+	if (msg->flags & I2C_M_RD)
+		*addr |= 1;
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *iproc_i2c,
+				      struct i2c_msg *msg)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + M_CMD_OFFSET);
+	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
+
+	switch (val) {
+	case M_CMD_STATUS_SUCCESS:
+		return 0;
+
+	case M_CMD_STATUS_LOST_ARB:
+		dev_dbg(iproc_i2c->device, "lost bus arbitration\n");
+		return -EAGAIN;
+
+	case M_CMD_STATUS_NACK_ADDR:
+		dev_dbg(iproc_i2c->device, "NAK addr:0x%02x\n", msg->addr);
+		return -ENXIO;
+
+	case M_CMD_STATUS_NACK_DATA:
+		dev_dbg(iproc_i2c->device, "NAK data\n");
+		return -ENXIO;
+
+	case M_CMD_STATUS_TIMEOUT:
+		dev_dbg(iproc_i2c->device, "bus timeout\n");
+		return -ETIMEDOUT;
+
+	default:
+		dev_dbg(iproc_i2c->device, "unknown error code=%d\n", val);
+		return -EIO;
+	}
+}
+
+static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *iproc_i2c,
+					 struct i2c_msg *msg)
+{
+	int ret, i;
+	u8 addr;
+	u32 val;
+	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	/* need to reserve one byte in the FIFO for the slave address */
+	if (msg->len > M_TX_RX_FIFO_SIZE - 1) {
+		dev_err(iproc_i2c->device,
+			"only support data length up to %u bytes\n",
+			M_TX_RX_FIFO_SIZE - 1);
+		return -EINVAL;
+	}
+
+	if (bcm_iproc_i2c_bus_busy(iproc_i2c)) {
+		dev_warn(iproc_i2c->device, "bus is busy\n");
+		return -EBUSY;
+	}
+
+	ret = bcm_iproc_i2c_format_addr(iproc_i2c, msg, &addr);
+	if (ret)
+		return ret;
+
+	/* load slave address into the TX FIFO */
+	writel(addr, iproc_i2c->base + M_TX_OFFSET);
+
+	/* for a write transaction, load data into the TX FIFO */
+	if (!(msg->flags & I2C_M_RD)) {
+		for (i = 0; i < msg->len; i++) {
+			val = msg->buf[i];
+
+			/* mark the last byte */
+			if (i == msg->len - 1)
+				val |= 1 << M_TX_WR_STATUS_SHIFT;
+
+			writel(val, iproc_i2c->base + M_TX_OFFSET);
+		}
+	}
+
+	/* mark as incomplete before starting the transaction */
+	reinit_completion(&iproc_i2c->done);
+	iproc_i2c->xfer_is_done = 0;
+
+	/*
+	 * Enable the "start busy" interrupt, which will be triggered after the
+	 * transaction is done, i.e., the internal start_busy bit, transitions
+	 * from 1 to 0.
+	 */
+	writel(1 << IE_M_START_BUSY_SHIFT, iproc_i2c->base + IE_OFFSET);
+
+	/*
+	 * Now we can activate the transfer. For a read operation, specify the
+	 * number of bytes to read
+	 */
+	val = 1 << M_CMD_START_BUSY_SHIFT;
+	if (msg->flags & I2C_M_RD) {
+		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
+		       (msg->len << M_CMD_RD_CNT_SHIFT);
+	} else {
+		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
+	}
+	writel(val, iproc_i2c->base + M_CMD_OFFSET);
+
+	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+	/* read it back to flush the write */
+	readl(iproc_i2c->base + IE_OFFSET);
+
+	/* make sure the interrupt handler isn't running */
+	synchronize_irq(iproc_i2c->irq);
+
+	if (!time_left && !iproc_i2c->xfer_is_done) {
+		dev_err(iproc_i2c->device, "transaction timed out\n");
+
+		/* flush FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return -ETIMEDOUT;
+	}
+
+	ret = bcm_iproc_i2c_check_status(iproc_i2c, msg);
+	if (ret) {
+		/* flush both TX/RX FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return ret;
+	}
+
+	/*
+	 * For a read operation, we now need to load the data from FIFO
+	 * into the memory buffer
+	 */
+	if (msg->flags & I2C_M_RD) {
+		for (i = 0; i < msg->len; i++) {
+			msg->buf[i] = (readl(iproc_i2c->base + M_RX_OFFSET) >>
+				      M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
+		}
+	}
+
+	dev_dbg(iproc_i2c->device, "xfer %c, addr=0x%02x, len=%d\n",
+		(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
+		msg->len);
+	dev_dbg(iproc_i2c->device, "*** data: %*ph\n", msg->len, msg->buf);
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
+			      struct i2c_msg msgs[], int num)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = i2c_get_adapdata(adapter);
+	int ret, i;
+
+	/* go through all messages */
+	for (i = 0; i < num; i++) {
+		ret = bcm_iproc_i2c_xfer_single_msg(iproc_i2c, &msgs[i]);
+		if (ret) {
+			dev_dbg(iproc_i2c->device, "xfer failed\n");
+			return ret;
+		}
+	}
+
+	return num;
+}
+
+static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm bcm_iproc_algo = {
+	.master_xfer = bcm_iproc_i2c_xfer,
+	.functionality = bcm_iproc_i2c_functionality,
+};
+
+static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	unsigned int bus_speed, speed_bit;
+	u32 val;
+	int ret = of_property_read_u32(iproc_i2c->device->of_node,
+				       "clock-frequency", &bus_speed);
+	if (ret < 0) {
+		dev_info(iproc_i2c->device,
+			"unable to interpret clock-frequency DT property\n");
+		bus_speed = 100000;
+	}
+
+	if (bus_speed < 100000) {
+		dev_err(iproc_i2c->device, "%d Hz bus speed not supported\n",
+			bus_speed);
+		dev_err(iproc_i2c->device,
+			"valid speeds are 100khz and 400khz\n");
+		return -EINVAL;
+	} else if (bus_speed < 400000) {
+		bus_speed = 100000;
+		speed_bit = 0;
+	} else {
+		bus_speed = 400000;
+		speed_bit = 1;
+	}
+
+	val = readl(iproc_i2c->base + TIM_CFG_OFFSET);
+	val &= ~(1 << TIM_CFG_MODE_400_SHIFT);
+	val |= speed_bit << TIM_CFG_MODE_400_SHIFT;
+	writel(val, iproc_i2c->base + TIM_CFG_OFFSET);
+
+	dev_info(iproc_i2c->device, "bus set to %u Hz\n", bus_speed);
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	/* put controller in reset */
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val |= 1 << CFG_RESET_SHIFT;
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* wait 100 usec per spec */
+	udelay(100);
+
+	/* bring controller out of reset */
+	val &= ~(1 << CFG_RESET_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
+	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
+	writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+
+	/* clear all pending interrupts */
+	writel(0xffffffff, iproc_i2c->base + IS_OFFSET);
+
+	return 0;
+}
+
+static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val |= 1 << CFG_EN_SHIFT;
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+}
+
+static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+}
+
+static int bcm_iproc_i2c_probe(struct platform_device *pdev)
+{
+	int irq, ret = 0;
+	struct bcm_iproc_i2c_dev *iproc_i2c;
+	struct i2c_adapter *adap;
+	struct resource *res;
+
+	iproc_i2c = devm_kzalloc(&pdev->dev, sizeof(*iproc_i2c),
+				 GFP_KERNEL);
+	if (!iproc_i2c)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, iproc_i2c);
+	iproc_i2c->device = &pdev->dev;
+	init_completion(&iproc_i2c->done);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	iproc_i2c->base = devm_ioremap_resource(iproc_i2c->device, res);
+	if (IS_ERR(iproc_i2c->base))
+		return PTR_ERR(iproc_i2c->base);
+
+	ret = bcm_iproc_i2c_init(iproc_i2c);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_cfg_speed(iproc_i2c);
+	if (ret)
+		return ret;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq <= 0) {
+		dev_err(iproc_i2c->device, "no irq resource\n");
+		return irq;
+	}
+	iproc_i2c->irq = irq;
+
+	ret = devm_request_irq(iproc_i2c->device, irq, bcm_iproc_i2c_isr, 0,
+			       pdev->name, iproc_i2c);
+	if (ret < 0) {
+		dev_err(iproc_i2c->device, "unable to request irq %i\n", irq);
+		return ret;
+	}
+
+	bcm_iproc_i2c_enable(iproc_i2c);
+
+	adap = &iproc_i2c->adapter;
+	i2c_set_adapdata(adap, iproc_i2c);
+	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
+	adap->algo = &bcm_iproc_algo;
+	adap->dev.parent = &pdev->dev;
+	adap->dev.of_node = pdev->dev.of_node;
+
+	ret = i2c_add_adapter(adap);
+	if (ret) {
+		dev_err(iproc_i2c->device, "failed to add adapter\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_remove(struct platform_device *pdev)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
+
+	/* make sure there's no pending interrupt when we remove the adapter */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+	readl(iproc_i2c->base + IE_OFFSET);
+	synchronize_irq(iproc_i2c->irq);
+
+	i2c_del_adapter(&iproc_i2c->adapter);
+	bcm_iproc_i2c_disable(iproc_i2c);
+
+	return 0;
+}
+
+static const struct of_device_id bcm_iproc_i2c_of_match[] = {
+	{ .compatible = "brcm,iproc-i2c" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
+
+static struct platform_driver bcm_iproc_i2c_driver = {
+	.driver = {
+		.name = "bcm-iproc-i2c",
+		.of_match_table = bcm_iproc_i2c_of_match,
+	},
+	.probe = bcm_iproc_i2c_probe,
+	.remove = bcm_iproc_i2c_remove,
+};
+module_platform_driver(bcm_iproc_i2c_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v8 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

Add initial support to the Broadcom iProc I2C controller found in the
iProc family of SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has
a size of 64 bytes. The iProc I2C controller supports two bus speeds
including standard mode (100kHz) and fast mode (400kHz)

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Reviewed-by: Kevin Cernekee <cernekee@chromium.org>
---
 drivers/i2c/busses/Kconfig         |   10 +
 drivers/i2c/busses/Makefile        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c |  494 ++++++++++++++++++++++++++++++++++++
 3 files changed, 505 insertions(+)
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index ab838d9..3d08731 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -372,6 +372,16 @@ config I2C_BCM2835
 	  This support is also available as a module.  If so, the module
 	  will be called i2c-bcm2835.
 
+config I2C_BCM_IPROC
+	tristate "Broadcom iProc I2C controller"
+	depends on ARCH_BCM_IPROC || COMPILE_TEST
+	default ARCH_BCM_IPROC
+	help
+	  If you say yes to this option, support will be included for the
+	  Broadcom iProc I2C controller.
+
+	  If you don't know what to do here, say N.
+
 config I2C_BCM_KONA
 	tristate "BCM Kona I2C adapter"
 	depends on ARCH_BCM_MOBILE
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 56388f6..d93b509 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
 obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
 obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
 obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
+obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
 obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
 obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
 obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
new file mode 100644
index 0000000..5d0a03f
--- /dev/null
+++ b/drivers/i2c/busses/i2c-bcm-iproc.c
@@ -0,0 +1,494 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+
+#define CFG_OFFSET                   0x00
+#define CFG_RESET_SHIFT              31
+#define CFG_EN_SHIFT                 30
+#define CFG_M_RETRY_CNT_SHIFT        16
+#define CFG_M_RETRY_CNT_MASK         0x0f
+
+#define TIM_CFG_OFFSET               0x04
+#define TIM_CFG_MODE_400_SHIFT       31
+
+#define M_FIFO_CTRL_OFFSET           0x0c
+#define M_FIFO_RX_FLUSH_SHIFT        31
+#define M_FIFO_TX_FLUSH_SHIFT        30
+#define M_FIFO_RX_CNT_SHIFT          16
+#define M_FIFO_RX_CNT_MASK           0x7f
+#define M_FIFO_RX_THLD_SHIFT         8
+#define M_FIFO_RX_THLD_MASK          0x3f
+
+#define M_CMD_OFFSET                 0x30
+#define M_CMD_START_BUSY_SHIFT       31
+#define M_CMD_STATUS_SHIFT           25
+#define M_CMD_STATUS_MASK            0x07
+#define M_CMD_STATUS_SUCCESS         0x0
+#define M_CMD_STATUS_LOST_ARB        0x1
+#define M_CMD_STATUS_NACK_ADDR       0x2
+#define M_CMD_STATUS_NACK_DATA       0x3
+#define M_CMD_STATUS_TIMEOUT         0x4
+#define M_CMD_PROTOCOL_SHIFT         9
+#define M_CMD_PROTOCOL_MASK          0xf
+#define M_CMD_PROTOCOL_BLK_WR        0x7
+#define M_CMD_PROTOCOL_BLK_RD        0x8
+#define M_CMD_PEC_SHIFT              8
+#define M_CMD_RD_CNT_SHIFT           0
+#define M_CMD_RD_CNT_MASK            0xff
+
+#define IE_OFFSET                    0x38
+#define IE_M_RX_FIFO_FULL_SHIFT      31
+#define IE_M_RX_THLD_SHIFT           30
+#define IE_M_START_BUSY_SHIFT        28
+
+#define IS_OFFSET                    0x3c
+#define IS_M_RX_FIFO_FULL_SHIFT      31
+#define IS_M_RX_THLD_SHIFT           30
+#define IS_M_START_BUSY_SHIFT        28
+
+#define M_TX_OFFSET                  0x40
+#define M_TX_WR_STATUS_SHIFT         31
+#define M_TX_DATA_SHIFT              0
+#define M_TX_DATA_MASK               0xff
+
+#define M_RX_OFFSET                  0x44
+#define M_RX_STATUS_SHIFT            30
+#define M_RX_STATUS_MASK             0x03
+#define M_RX_PEC_ERR_SHIFT           29
+#define M_RX_DATA_SHIFT              0
+#define M_RX_DATA_MASK               0xff
+
+#define I2C_TIMEOUT_MESC             100
+#define M_TX_RX_FIFO_SIZE            64
+
+enum bus_speed_index {
+	I2C_SPD_100K = 0,
+	I2C_SPD_400K,
+};
+
+struct bcm_iproc_i2c_dev {
+	struct device *device;
+	int irq;
+
+	void __iomem *base;
+
+	struct i2c_adapter adapter;
+
+	struct completion done;
+	int xfer_is_done;
+};
+
+/*
+ * Can be expanded in the future if more interrupt status bits are utilized
+ */
+#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
+
+static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = data;
+	u32 status = readl(iproc_i2c->base + IS_OFFSET);
+
+	status &= ISR_MASK;
+
+	if (!status)
+		return IRQ_NONE;
+
+	writel(status, iproc_i2c->base + IS_OFFSET);
+	iproc_i2c->xfer_is_done = 1;
+	complete_all(&iproc_i2c->done);
+
+	return IRQ_HANDLED;
+}
+
+static bool bcm_iproc_i2c_bus_busy(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	if (readl(iproc_i2c->base + M_CMD_OFFSET) &
+	    (1 << M_CMD_START_BUSY_SHIFT))
+		return true;
+	else
+		return false;
+}
+
+static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *iproc_i2c,
+				     struct i2c_msg *msg, u8 *addr)
+{
+	*addr = msg->addr << 1;
+
+	if (msg->flags & I2C_M_RD)
+		*addr |= 1;
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *iproc_i2c,
+				      struct i2c_msg *msg)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + M_CMD_OFFSET);
+	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
+
+	switch (val) {
+	case M_CMD_STATUS_SUCCESS:
+		return 0;
+
+	case M_CMD_STATUS_LOST_ARB:
+		dev_dbg(iproc_i2c->device, "lost bus arbitration\n");
+		return -EAGAIN;
+
+	case M_CMD_STATUS_NACK_ADDR:
+		dev_dbg(iproc_i2c->device, "NAK addr:0x%02x\n", msg->addr);
+		return -ENXIO;
+
+	case M_CMD_STATUS_NACK_DATA:
+		dev_dbg(iproc_i2c->device, "NAK data\n");
+		return -ENXIO;
+
+	case M_CMD_STATUS_TIMEOUT:
+		dev_dbg(iproc_i2c->device, "bus timeout\n");
+		return -ETIMEDOUT;
+
+	default:
+		dev_dbg(iproc_i2c->device, "unknown error code=%d\n", val);
+		return -EIO;
+	}
+}
+
+static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *iproc_i2c,
+					 struct i2c_msg *msg)
+{
+	int ret, i;
+	u8 addr;
+	u32 val;
+	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	/* need to reserve one byte in the FIFO for the slave address */
+	if (msg->len > M_TX_RX_FIFO_SIZE - 1) {
+		dev_err(iproc_i2c->device,
+			"only support data length up to %u bytes\n",
+			M_TX_RX_FIFO_SIZE - 1);
+		return -EINVAL;
+	}
+
+	if (bcm_iproc_i2c_bus_busy(iproc_i2c)) {
+		dev_warn(iproc_i2c->device, "bus is busy\n");
+		return -EBUSY;
+	}
+
+	ret = bcm_iproc_i2c_format_addr(iproc_i2c, msg, &addr);
+	if (ret)
+		return ret;
+
+	/* load slave address into the TX FIFO */
+	writel(addr, iproc_i2c->base + M_TX_OFFSET);
+
+	/* for a write transaction, load data into the TX FIFO */
+	if (!(msg->flags & I2C_M_RD)) {
+		for (i = 0; i < msg->len; i++) {
+			val = msg->buf[i];
+
+			/* mark the last byte */
+			if (i == msg->len - 1)
+				val |= 1 << M_TX_WR_STATUS_SHIFT;
+
+			writel(val, iproc_i2c->base + M_TX_OFFSET);
+		}
+	}
+
+	/* mark as incomplete before starting the transaction */
+	reinit_completion(&iproc_i2c->done);
+	iproc_i2c->xfer_is_done = 0;
+
+	/*
+	 * Enable the "start busy" interrupt, which will be triggered after the
+	 * transaction is done, i.e., the internal start_busy bit, transitions
+	 * from 1 to 0.
+	 */
+	writel(1 << IE_M_START_BUSY_SHIFT, iproc_i2c->base + IE_OFFSET);
+
+	/*
+	 * Now we can activate the transfer. For a read operation, specify the
+	 * number of bytes to read
+	 */
+	val = 1 << M_CMD_START_BUSY_SHIFT;
+	if (msg->flags & I2C_M_RD) {
+		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
+		       (msg->len << M_CMD_RD_CNT_SHIFT);
+	} else {
+		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
+	}
+	writel(val, iproc_i2c->base + M_CMD_OFFSET);
+
+	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+	/* read it back to flush the write */
+	readl(iproc_i2c->base + IE_OFFSET);
+
+	/* make sure the interrupt handler isn't running */
+	synchronize_irq(iproc_i2c->irq);
+
+	if (!time_left && !iproc_i2c->xfer_is_done) {
+		dev_err(iproc_i2c->device, "transaction timed out\n");
+
+		/* flush FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return -ETIMEDOUT;
+	}
+
+	ret = bcm_iproc_i2c_check_status(iproc_i2c, msg);
+	if (ret) {
+		/* flush both TX/RX FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return ret;
+	}
+
+	/*
+	 * For a read operation, we now need to load the data from FIFO
+	 * into the memory buffer
+	 */
+	if (msg->flags & I2C_M_RD) {
+		for (i = 0; i < msg->len; i++) {
+			msg->buf[i] = (readl(iproc_i2c->base + M_RX_OFFSET) >>
+				      M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
+		}
+	}
+
+	dev_dbg(iproc_i2c->device, "xfer %c, addr=0x%02x, len=%d\n",
+		(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
+		msg->len);
+	dev_dbg(iproc_i2c->device, "*** data: %*ph\n", msg->len, msg->buf);
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
+			      struct i2c_msg msgs[], int num)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = i2c_get_adapdata(adapter);
+	int ret, i;
+
+	/* go through all messages */
+	for (i = 0; i < num; i++) {
+		ret = bcm_iproc_i2c_xfer_single_msg(iproc_i2c, &msgs[i]);
+		if (ret) {
+			dev_dbg(iproc_i2c->device, "xfer failed\n");
+			return ret;
+		}
+	}
+
+	return num;
+}
+
+static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm bcm_iproc_algo = {
+	.master_xfer = bcm_iproc_i2c_xfer,
+	.functionality = bcm_iproc_i2c_functionality,
+};
+
+static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	unsigned int bus_speed, speed_bit;
+	u32 val;
+	int ret = of_property_read_u32(iproc_i2c->device->of_node,
+				       "clock-frequency", &bus_speed);
+	if (ret < 0) {
+		dev_info(iproc_i2c->device,
+			"unable to interpret clock-frequency DT property\n");
+		bus_speed = 100000;
+	}
+
+	if (bus_speed < 100000) {
+		dev_err(iproc_i2c->device, "%d Hz bus speed not supported\n",
+			bus_speed);
+		dev_err(iproc_i2c->device,
+			"valid speeds are 100khz and 400khz\n");
+		return -EINVAL;
+	} else if (bus_speed < 400000) {
+		bus_speed = 100000;
+		speed_bit = 0;
+	} else {
+		bus_speed = 400000;
+		speed_bit = 1;
+	}
+
+	val = readl(iproc_i2c->base + TIM_CFG_OFFSET);
+	val &= ~(1 << TIM_CFG_MODE_400_SHIFT);
+	val |= speed_bit << TIM_CFG_MODE_400_SHIFT;
+	writel(val, iproc_i2c->base + TIM_CFG_OFFSET);
+
+	dev_info(iproc_i2c->device, "bus set to %u Hz\n", bus_speed);
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	/* put controller in reset */
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val |= 1 << CFG_RESET_SHIFT;
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* wait 100 usec per spec */
+	udelay(100);
+
+	/* bring controller out of reset */
+	val &= ~(1 << CFG_RESET_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
+	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
+	writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+
+	/* clear all pending interrupts */
+	writel(0xffffffff, iproc_i2c->base + IS_OFFSET);
+
+	return 0;
+}
+
+static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val |= 1 << CFG_EN_SHIFT;
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+}
+
+static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+}
+
+static int bcm_iproc_i2c_probe(struct platform_device *pdev)
+{
+	int irq, ret = 0;
+	struct bcm_iproc_i2c_dev *iproc_i2c;
+	struct i2c_adapter *adap;
+	struct resource *res;
+
+	iproc_i2c = devm_kzalloc(&pdev->dev, sizeof(*iproc_i2c),
+				 GFP_KERNEL);
+	if (!iproc_i2c)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, iproc_i2c);
+	iproc_i2c->device = &pdev->dev;
+	init_completion(&iproc_i2c->done);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	iproc_i2c->base = devm_ioremap_resource(iproc_i2c->device, res);
+	if (IS_ERR(iproc_i2c->base))
+		return PTR_ERR(iproc_i2c->base);
+
+	ret = bcm_iproc_i2c_init(iproc_i2c);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_cfg_speed(iproc_i2c);
+	if (ret)
+		return ret;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq <= 0) {
+		dev_err(iproc_i2c->device, "no irq resource\n");
+		return irq;
+	}
+	iproc_i2c->irq = irq;
+
+	ret = devm_request_irq(iproc_i2c->device, irq, bcm_iproc_i2c_isr, 0,
+			       pdev->name, iproc_i2c);
+	if (ret < 0) {
+		dev_err(iproc_i2c->device, "unable to request irq %i\n", irq);
+		return ret;
+	}
+
+	bcm_iproc_i2c_enable(iproc_i2c);
+
+	adap = &iproc_i2c->adapter;
+	i2c_set_adapdata(adap, iproc_i2c);
+	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
+	adap->algo = &bcm_iproc_algo;
+	adap->dev.parent = &pdev->dev;
+	adap->dev.of_node = pdev->dev.of_node;
+
+	ret = i2c_add_adapter(adap);
+	if (ret) {
+		dev_err(iproc_i2c->device, "failed to add adapter\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_remove(struct platform_device *pdev)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
+
+	/* make sure there's no pending interrupt when we remove the adapter */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+	readl(iproc_i2c->base + IE_OFFSET);
+	synchronize_irq(iproc_i2c->irq);
+
+	i2c_del_adapter(&iproc_i2c->adapter);
+	bcm_iproc_i2c_disable(iproc_i2c);
+
+	return 0;
+}
+
+static const struct of_device_id bcm_iproc_i2c_of_match[] = {
+	{ .compatible = "brcm,iproc-i2c" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
+
+static struct platform_driver bcm_iproc_i2c_driver = {
+	.driver = {
+		.name = "bcm-iproc-i2c",
+		.of_match_table = bcm_iproc_i2c_of_match,
+	},
+	.probe = bcm_iproc_i2c_probe,
+	.remove = bcm_iproc_i2c_remove,
+};
+module_platform_driver(bcm_iproc_i2c_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v8 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

Add initial support to the Broadcom iProc I2C controller found in the
iProc family of SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has
a size of 64 bytes. The iProc I2C controller supports two bus speeds
including standard mode (100kHz) and fast mode (400kHz)

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Reviewed-by: Kevin Cernekee <cernekee@chromium.org>
---
 drivers/i2c/busses/Kconfig         |   10 +
 drivers/i2c/busses/Makefile        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c |  494 ++++++++++++++++++++++++++++++++++++
 3 files changed, 505 insertions(+)
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index ab838d9..3d08731 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -372,6 +372,16 @@ config I2C_BCM2835
 	  This support is also available as a module.  If so, the module
 	  will be called i2c-bcm2835.
 
+config I2C_BCM_IPROC
+	tristate "Broadcom iProc I2C controller"
+	depends on ARCH_BCM_IPROC || COMPILE_TEST
+	default ARCH_BCM_IPROC
+	help
+	  If you say yes to this option, support will be included for the
+	  Broadcom iProc I2C controller.
+
+	  If you don't know what to do here, say N.
+
 config I2C_BCM_KONA
 	tristate "BCM Kona I2C adapter"
 	depends on ARCH_BCM_MOBILE
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 56388f6..d93b509 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
 obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
 obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
 obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
+obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
 obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
 obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
 obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
new file mode 100644
index 0000000..5d0a03f
--- /dev/null
+++ b/drivers/i2c/busses/i2c-bcm-iproc.c
@@ -0,0 +1,494 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+
+#define CFG_OFFSET                   0x00
+#define CFG_RESET_SHIFT              31
+#define CFG_EN_SHIFT                 30
+#define CFG_M_RETRY_CNT_SHIFT        16
+#define CFG_M_RETRY_CNT_MASK         0x0f
+
+#define TIM_CFG_OFFSET               0x04
+#define TIM_CFG_MODE_400_SHIFT       31
+
+#define M_FIFO_CTRL_OFFSET           0x0c
+#define M_FIFO_RX_FLUSH_SHIFT        31
+#define M_FIFO_TX_FLUSH_SHIFT        30
+#define M_FIFO_RX_CNT_SHIFT          16
+#define M_FIFO_RX_CNT_MASK           0x7f
+#define M_FIFO_RX_THLD_SHIFT         8
+#define M_FIFO_RX_THLD_MASK          0x3f
+
+#define M_CMD_OFFSET                 0x30
+#define M_CMD_START_BUSY_SHIFT       31
+#define M_CMD_STATUS_SHIFT           25
+#define M_CMD_STATUS_MASK            0x07
+#define M_CMD_STATUS_SUCCESS         0x0
+#define M_CMD_STATUS_LOST_ARB        0x1
+#define M_CMD_STATUS_NACK_ADDR       0x2
+#define M_CMD_STATUS_NACK_DATA       0x3
+#define M_CMD_STATUS_TIMEOUT         0x4
+#define M_CMD_PROTOCOL_SHIFT         9
+#define M_CMD_PROTOCOL_MASK          0xf
+#define M_CMD_PROTOCOL_BLK_WR        0x7
+#define M_CMD_PROTOCOL_BLK_RD        0x8
+#define M_CMD_PEC_SHIFT              8
+#define M_CMD_RD_CNT_SHIFT           0
+#define M_CMD_RD_CNT_MASK            0xff
+
+#define IE_OFFSET                    0x38
+#define IE_M_RX_FIFO_FULL_SHIFT      31
+#define IE_M_RX_THLD_SHIFT           30
+#define IE_M_START_BUSY_SHIFT        28
+
+#define IS_OFFSET                    0x3c
+#define IS_M_RX_FIFO_FULL_SHIFT      31
+#define IS_M_RX_THLD_SHIFT           30
+#define IS_M_START_BUSY_SHIFT        28
+
+#define M_TX_OFFSET                  0x40
+#define M_TX_WR_STATUS_SHIFT         31
+#define M_TX_DATA_SHIFT              0
+#define M_TX_DATA_MASK               0xff
+
+#define M_RX_OFFSET                  0x44
+#define M_RX_STATUS_SHIFT            30
+#define M_RX_STATUS_MASK             0x03
+#define M_RX_PEC_ERR_SHIFT           29
+#define M_RX_DATA_SHIFT              0
+#define M_RX_DATA_MASK               0xff
+
+#define I2C_TIMEOUT_MESC             100
+#define M_TX_RX_FIFO_SIZE            64
+
+enum bus_speed_index {
+	I2C_SPD_100K = 0,
+	I2C_SPD_400K,
+};
+
+struct bcm_iproc_i2c_dev {
+	struct device *device;
+	int irq;
+
+	void __iomem *base;
+
+	struct i2c_adapter adapter;
+
+	struct completion done;
+	int xfer_is_done;
+};
+
+/*
+ * Can be expanded in the future if more interrupt status bits are utilized
+ */
+#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
+
+static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = data;
+	u32 status = readl(iproc_i2c->base + IS_OFFSET);
+
+	status &= ISR_MASK;
+
+	if (!status)
+		return IRQ_NONE;
+
+	writel(status, iproc_i2c->base + IS_OFFSET);
+	iproc_i2c->xfer_is_done = 1;
+	complete_all(&iproc_i2c->done);
+
+	return IRQ_HANDLED;
+}
+
+static bool bcm_iproc_i2c_bus_busy(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	if (readl(iproc_i2c->base + M_CMD_OFFSET) &
+	    (1 << M_CMD_START_BUSY_SHIFT))
+		return true;
+	else
+		return false;
+}
+
+static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *iproc_i2c,
+				     struct i2c_msg *msg, u8 *addr)
+{
+	*addr = msg->addr << 1;
+
+	if (msg->flags & I2C_M_RD)
+		*addr |= 1;
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *iproc_i2c,
+				      struct i2c_msg *msg)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + M_CMD_OFFSET);
+	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
+
+	switch (val) {
+	case M_CMD_STATUS_SUCCESS:
+		return 0;
+
+	case M_CMD_STATUS_LOST_ARB:
+		dev_dbg(iproc_i2c->device, "lost bus arbitration\n");
+		return -EAGAIN;
+
+	case M_CMD_STATUS_NACK_ADDR:
+		dev_dbg(iproc_i2c->device, "NAK addr:0x%02x\n", msg->addr);
+		return -ENXIO;
+
+	case M_CMD_STATUS_NACK_DATA:
+		dev_dbg(iproc_i2c->device, "NAK data\n");
+		return -ENXIO;
+
+	case M_CMD_STATUS_TIMEOUT:
+		dev_dbg(iproc_i2c->device, "bus timeout\n");
+		return -ETIMEDOUT;
+
+	default:
+		dev_dbg(iproc_i2c->device, "unknown error code=%d\n", val);
+		return -EIO;
+	}
+}
+
+static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *iproc_i2c,
+					 struct i2c_msg *msg)
+{
+	int ret, i;
+	u8 addr;
+	u32 val;
+	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	/* need to reserve one byte in the FIFO for the slave address */
+	if (msg->len > M_TX_RX_FIFO_SIZE - 1) {
+		dev_err(iproc_i2c->device,
+			"only support data length up to %u bytes\n",
+			M_TX_RX_FIFO_SIZE - 1);
+		return -EINVAL;
+	}
+
+	if (bcm_iproc_i2c_bus_busy(iproc_i2c)) {
+		dev_warn(iproc_i2c->device, "bus is busy\n");
+		return -EBUSY;
+	}
+
+	ret = bcm_iproc_i2c_format_addr(iproc_i2c, msg, &addr);
+	if (ret)
+		return ret;
+
+	/* load slave address into the TX FIFO */
+	writel(addr, iproc_i2c->base + M_TX_OFFSET);
+
+	/* for a write transaction, load data into the TX FIFO */
+	if (!(msg->flags & I2C_M_RD)) {
+		for (i = 0; i < msg->len; i++) {
+			val = msg->buf[i];
+
+			/* mark the last byte */
+			if (i == msg->len - 1)
+				val |= 1 << M_TX_WR_STATUS_SHIFT;
+
+			writel(val, iproc_i2c->base + M_TX_OFFSET);
+		}
+	}
+
+	/* mark as incomplete before starting the transaction */
+	reinit_completion(&iproc_i2c->done);
+	iproc_i2c->xfer_is_done = 0;
+
+	/*
+	 * Enable the "start busy" interrupt, which will be triggered after the
+	 * transaction is done, i.e., the internal start_busy bit, transitions
+	 * from 1 to 0.
+	 */
+	writel(1 << IE_M_START_BUSY_SHIFT, iproc_i2c->base + IE_OFFSET);
+
+	/*
+	 * Now we can activate the transfer. For a read operation, specify the
+	 * number of bytes to read
+	 */
+	val = 1 << M_CMD_START_BUSY_SHIFT;
+	if (msg->flags & I2C_M_RD) {
+		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
+		       (msg->len << M_CMD_RD_CNT_SHIFT);
+	} else {
+		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
+	}
+	writel(val, iproc_i2c->base + M_CMD_OFFSET);
+
+	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+	/* read it back to flush the write */
+	readl(iproc_i2c->base + IE_OFFSET);
+
+	/* make sure the interrupt handler isn't running */
+	synchronize_irq(iproc_i2c->irq);
+
+	if (!time_left && !iproc_i2c->xfer_is_done) {
+		dev_err(iproc_i2c->device, "transaction timed out\n");
+
+		/* flush FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return -ETIMEDOUT;
+	}
+
+	ret = bcm_iproc_i2c_check_status(iproc_i2c, msg);
+	if (ret) {
+		/* flush both TX/RX FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return ret;
+	}
+
+	/*
+	 * For a read operation, we now need to load the data from FIFO
+	 * into the memory buffer
+	 */
+	if (msg->flags & I2C_M_RD) {
+		for (i = 0; i < msg->len; i++) {
+			msg->buf[i] = (readl(iproc_i2c->base + M_RX_OFFSET) >>
+				      M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
+		}
+	}
+
+	dev_dbg(iproc_i2c->device, "xfer %c, addr=0x%02x, len=%d\n",
+		(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
+		msg->len);
+	dev_dbg(iproc_i2c->device, "*** data: %*ph\n", msg->len, msg->buf);
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
+			      struct i2c_msg msgs[], int num)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = i2c_get_adapdata(adapter);
+	int ret, i;
+
+	/* go through all messages */
+	for (i = 0; i < num; i++) {
+		ret = bcm_iproc_i2c_xfer_single_msg(iproc_i2c, &msgs[i]);
+		if (ret) {
+			dev_dbg(iproc_i2c->device, "xfer failed\n");
+			return ret;
+		}
+	}
+
+	return num;
+}
+
+static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm bcm_iproc_algo = {
+	.master_xfer = bcm_iproc_i2c_xfer,
+	.functionality = bcm_iproc_i2c_functionality,
+};
+
+static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	unsigned int bus_speed, speed_bit;
+	u32 val;
+	int ret = of_property_read_u32(iproc_i2c->device->of_node,
+				       "clock-frequency", &bus_speed);
+	if (ret < 0) {
+		dev_info(iproc_i2c->device,
+			"unable to interpret clock-frequency DT property\n");
+		bus_speed = 100000;
+	}
+
+	if (bus_speed < 100000) {
+		dev_err(iproc_i2c->device, "%d Hz bus speed not supported\n",
+			bus_speed);
+		dev_err(iproc_i2c->device,
+			"valid speeds are 100khz and 400khz\n");
+		return -EINVAL;
+	} else if (bus_speed < 400000) {
+		bus_speed = 100000;
+		speed_bit = 0;
+	} else {
+		bus_speed = 400000;
+		speed_bit = 1;
+	}
+
+	val = readl(iproc_i2c->base + TIM_CFG_OFFSET);
+	val &= ~(1 << TIM_CFG_MODE_400_SHIFT);
+	val |= speed_bit << TIM_CFG_MODE_400_SHIFT;
+	writel(val, iproc_i2c->base + TIM_CFG_OFFSET);
+
+	dev_info(iproc_i2c->device, "bus set to %u Hz\n", bus_speed);
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	/* put controller in reset */
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val |= 1 << CFG_RESET_SHIFT;
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* wait 100 usec per spec */
+	udelay(100);
+
+	/* bring controller out of reset */
+	val &= ~(1 << CFG_RESET_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
+	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
+	writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+
+	/* clear all pending interrupts */
+	writel(0xffffffff, iproc_i2c->base + IS_OFFSET);
+
+	return 0;
+}
+
+static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val |= 1 << CFG_EN_SHIFT;
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+}
+
+static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+}
+
+static int bcm_iproc_i2c_probe(struct platform_device *pdev)
+{
+	int irq, ret = 0;
+	struct bcm_iproc_i2c_dev *iproc_i2c;
+	struct i2c_adapter *adap;
+	struct resource *res;
+
+	iproc_i2c = devm_kzalloc(&pdev->dev, sizeof(*iproc_i2c),
+				 GFP_KERNEL);
+	if (!iproc_i2c)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, iproc_i2c);
+	iproc_i2c->device = &pdev->dev;
+	init_completion(&iproc_i2c->done);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	iproc_i2c->base = devm_ioremap_resource(iproc_i2c->device, res);
+	if (IS_ERR(iproc_i2c->base))
+		return PTR_ERR(iproc_i2c->base);
+
+	ret = bcm_iproc_i2c_init(iproc_i2c);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_cfg_speed(iproc_i2c);
+	if (ret)
+		return ret;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq <= 0) {
+		dev_err(iproc_i2c->device, "no irq resource\n");
+		return irq;
+	}
+	iproc_i2c->irq = irq;
+
+	ret = devm_request_irq(iproc_i2c->device, irq, bcm_iproc_i2c_isr, 0,
+			       pdev->name, iproc_i2c);
+	if (ret < 0) {
+		dev_err(iproc_i2c->device, "unable to request irq %i\n", irq);
+		return ret;
+	}
+
+	bcm_iproc_i2c_enable(iproc_i2c);
+
+	adap = &iproc_i2c->adapter;
+	i2c_set_adapdata(adap, iproc_i2c);
+	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
+	adap->algo = &bcm_iproc_algo;
+	adap->dev.parent = &pdev->dev;
+	adap->dev.of_node = pdev->dev.of_node;
+
+	ret = i2c_add_adapter(adap);
+	if (ret) {
+		dev_err(iproc_i2c->device, "failed to add adapter\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_remove(struct platform_device *pdev)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
+
+	/* make sure there's no pending interrupt when we remove the adapter */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+	readl(iproc_i2c->base + IE_OFFSET);
+	synchronize_irq(iproc_i2c->irq);
+
+	i2c_del_adapter(&iproc_i2c->adapter);
+	bcm_iproc_i2c_disable(iproc_i2c);
+
+	return 0;
+}
+
+static const struct of_device_id bcm_iproc_i2c_of_match[] = {
+	{ .compatible = "brcm,iproc-i2c" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
+
+static struct platform_driver bcm_iproc_i2c_driver = {
+	.driver = {
+		.name = "bcm-iproc-i2c",
+		.of_match_table = bcm_iproc_i2c_of_match,
+	},
+	.probe = bcm_iproc_i2c_probe,
+	.remove = bcm_iproc_i2c_remove,
+};
+module_platform_driver(bcm_iproc_i2c_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v8 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
them disabled there. Individual I2C devices can be enabled in board
specific dts file when I2C slave devices are enabled in the future

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Reviewed-by: Kevin Cernekee <cernekee@chromium.org>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..ff5fb6a 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -70,6 +70,26 @@
 		};
 	};
 
+	i2c0: i2c@18008000 {
+		compatible = "brcm,cygnus-iproc-i2c", "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
+	i2c1: i2c@1800b000 {
+		compatible = "brcm,cygnus-iproc-i2c", "brcm,iproc-i2c";
+		reg = <0x1800b000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 86 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
 	uart0: serial@18020000 {
 		compatible = "snps,dw-apb-uart";
 		reg = <0x18020000 0x100>;
-- 
1.7.9.5

[PATCH v8 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
them disabled there. Individual I2C devices can be enabled in board
specific dts file when I2C slave devices are enabled in the future

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Reviewed-by: Kevin Cernekee <cernekee@chromium.org>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..ff5fb6a 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -70,6 +70,26 @@
 		};
 	};
 
+	i2c0: i2c@18008000 {
+		compatible = "brcm,cygnus-iproc-i2c", "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
+	i2c1: i2c@1800b000 {
+		compatible = "brcm,cygnus-iproc-i2c", "brcm,iproc-i2c";
+		reg = <0x1800b000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 86 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
 	uart0: serial@18020000 {
 		compatible = "snps,dw-apb-uart";
 		reg = <0x18020000 0x100>;
-- 
1.7.9.5

[PATCH v8 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
them disabled there. Individual I2C devices can be enabled in board
specific dts file when I2C slave devices are enabled in the future

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Reviewed-by: Kevin Cernekee <cernekee@chromium.org>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..ff5fb6a 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -70,6 +70,26 @@
 		};
 	};
 
+	i2c0: i2c at 18008000 {
+		compatible = "brcm,cygnus-iproc-i2c", "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
+	i2c1: i2c at 1800b000 {
+		compatible = "brcm,cygnus-iproc-i2c", "brcm,iproc-i2c";
+		reg = <0x1800b000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 86 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
 	uart0: serial at 18020000 {
 		compatible = "snps,dw-apb-uart";
 		reg = <0x18020000 0x100>;
-- 
1.7.9.5

Re: [PATCH v8 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Wolfram Sang]

[-- Attachment #1: Type: text/plain, Size: 3332 bytes --]

Hi Ray,

On Fri, Feb 06, 2015 at 05:28:26PM -0800, Ray Jui wrote:
> Add initial support to the Broadcom iProc I2C controller found in the
> iProc family of SoCs.
> 
> The iProc I2C controller has separate internal TX and RX FIFOs, each has
> a size of 64 bytes. The iProc I2C controller supports two bus speeds
> including standard mode (100kHz) and fast mode (400kHz)

Mostly looking good.

> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/i2c.h>
> +#include <linux/interrupt.h>
> +#include <linux/platform_device.h>
> +#include <linux/io.h>
> +#include <linux/slab.h>
> +#include <linux/delay.h>

Please sort the includes.

> +static bool bcm_iproc_i2c_bus_busy(struct bcm_iproc_i2c_dev *iproc_i2c)
> +{
> +	if (readl(iproc_i2c->base + M_CMD_OFFSET) &
> +	    (1 << M_CMD_START_BUSY_SHIFT))
> +		return true;
> +	else
> +		return false;
> +}

Minor: return !!(readl(...))? You decide.

> +
> +static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *iproc_i2c,
> +				     struct i2c_msg *msg, u8 *addr)
> +{
> +	*addr = msg->addr << 1;
> +
> +	if (msg->flags & I2C_M_RD)
> +		*addr |= 1;
> +
> +	return 0;
> +}

I'd suggest a oneliner.

*addr = msg->addr << 1 | (msg->flags & I2C_M_RD ? 1 : 0)

Or use !! like above.

Don't do an extra function for that. It is only used once and it also
doesn't need to be int since it can't fail anyhow.

(Note to self: I should make a macro for that in i2c.h)

> +	/* need to reserve one byte in the FIFO for the slave address */
> +	if (msg->len > M_TX_RX_FIFO_SIZE - 1) {
> +		dev_err(iproc_i2c->device,
> +			"only support data length up to %u bytes\n",
> +			M_TX_RX_FIFO_SIZE - 1);
> +		return -EINVAL;

-EOPNOTSUPP

Is it really a HW limitation? Could the driver later be extended to
continue filling the FIFO if a certain threshold is reached?

> +	dev_dbg(iproc_i2c->device, "xfer %c, addr=0x%02x, len=%d\n",
> +		(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
> +		msg->len);
> +	dev_dbg(iproc_i2c->device, "*** data: %*ph\n", msg->len, msg->buf);

Not really needed. We have tracing for that.

> +	if (bus_speed < 100000) {
> +		dev_err(iproc_i2c->device, "%d Hz bus speed not supported\n",
> +			bus_speed);
> +		dev_err(iproc_i2c->device,
> +			"valid speeds are 100khz and 400khz\n");
> +		return -EINVAL;
> +	} else if (bus_speed < 400000) {
> +		bus_speed = 100000;
> +		speed_bit = 0;
> +	} else {
> +		bus_speed = 400000;
> +		speed_bit = 1;
> +	}
> +
> +	val = readl(iproc_i2c->base + TIM_CFG_OFFSET);
> +	val &= ~(1 << TIM_CFG_MODE_400_SHIFT);
> +	val |= speed_bit << TIM_CFG_MODE_400_SHIFT;

val |= (bus_speed == 400000) ...

and skip speed_bit? You decide.

> +static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *iproc_i2c)
> +{
> +	u32 val;
> +
> +	val = readl(iproc_i2c->base + CFG_OFFSET);
> +	val |= 1 << CFG_EN_SHIFT;
> +	writel(val, iproc_i2c->base + CFG_OFFSET);
> +}
> +
> +static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *iproc_i2c)
> +{
> +	u32 val;
> +
> +	val = readl(iproc_i2c->base + CFG_OFFSET);
> +	val &= ~(1 << CFG_EN_SHIFT);
> +	writel(val, iproc_i2c->base + CFG_OFFSET);
> +}

Extra functions? They are self explaining and only used once. You
decide.

Rest looks fine, thanks!


[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 819 bytes --]

Re: [PATCH v8 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Wolfram Sang]

[-- Attachment #1: Type: text/plain, Size: 3332 bytes --]

Hi Ray,

On Fri, Feb 06, 2015 at 05:28:26PM -0800, Ray Jui wrote:
> Add initial support to the Broadcom iProc I2C controller found in the
> iProc family of SoCs.
> 
> The iProc I2C controller has separate internal TX and RX FIFOs, each has
> a size of 64 bytes. The iProc I2C controller supports two bus speeds
> including standard mode (100kHz) and fast mode (400kHz)

Mostly looking good.

> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/i2c.h>
> +#include <linux/interrupt.h>
> +#include <linux/platform_device.h>
> +#include <linux/io.h>
> +#include <linux/slab.h>
> +#include <linux/delay.h>

Please sort the includes.

> +static bool bcm_iproc_i2c_bus_busy(struct bcm_iproc_i2c_dev *iproc_i2c)
> +{
> +	if (readl(iproc_i2c->base + M_CMD_OFFSET) &
> +	    (1 << M_CMD_START_BUSY_SHIFT))
> +		return true;
> +	else
> +		return false;
> +}

Minor: return !!(readl(...))? You decide.

> +
> +static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *iproc_i2c,
> +				     struct i2c_msg *msg, u8 *addr)
> +{
> +	*addr = msg->addr << 1;
> +
> +	if (msg->flags & I2C_M_RD)
> +		*addr |= 1;
> +
> +	return 0;
> +}

I'd suggest a oneliner.

*addr = msg->addr << 1 | (msg->flags & I2C_M_RD ? 1 : 0)

Or use !! like above.

Don't do an extra function for that. It is only used once and it also
doesn't need to be int since it can't fail anyhow.

(Note to self: I should make a macro for that in i2c.h)

> +	/* need to reserve one byte in the FIFO for the slave address */
> +	if (msg->len > M_TX_RX_FIFO_SIZE - 1) {
> +		dev_err(iproc_i2c->device,
> +			"only support data length up to %u bytes\n",
> +			M_TX_RX_FIFO_SIZE - 1);
> +		return -EINVAL;

-EOPNOTSUPP

Is it really a HW limitation? Could the driver later be extended to
continue filling the FIFO if a certain threshold is reached?

> +	dev_dbg(iproc_i2c->device, "xfer %c, addr=0x%02x, len=%d\n",
> +		(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
> +		msg->len);
> +	dev_dbg(iproc_i2c->device, "*** data: %*ph\n", msg->len, msg->buf);

Not really needed. We have tracing for that.

> +	if (bus_speed < 100000) {
> +		dev_err(iproc_i2c->device, "%d Hz bus speed not supported\n",
> +			bus_speed);
> +		dev_err(iproc_i2c->device,
> +			"valid speeds are 100khz and 400khz\n");
> +		return -EINVAL;
> +	} else if (bus_speed < 400000) {
> +		bus_speed = 100000;
> +		speed_bit = 0;
> +	} else {
> +		bus_speed = 400000;
> +		speed_bit = 1;
> +	}
> +
> +	val = readl(iproc_i2c->base + TIM_CFG_OFFSET);
> +	val &= ~(1 << TIM_CFG_MODE_400_SHIFT);
> +	val |= speed_bit << TIM_CFG_MODE_400_SHIFT;

val |= (bus_speed == 400000) ...

and skip speed_bit? You decide.

> +static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *iproc_i2c)
> +{
> +	u32 val;
> +
> +	val = readl(iproc_i2c->base + CFG_OFFSET);
> +	val |= 1 << CFG_EN_SHIFT;
> +	writel(val, iproc_i2c->base + CFG_OFFSET);
> +}
> +
> +static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *iproc_i2c)
> +{
> +	u32 val;
> +
> +	val = readl(iproc_i2c->base + CFG_OFFSET);
> +	val &= ~(1 << CFG_EN_SHIFT);
> +	writel(val, iproc_i2c->base + CFG_OFFSET);
> +}

Extra functions? They are self explaining and only used once. You
decide.

Rest looks fine, thanks!


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[PATCH v8 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Wolfram Sang]

Hi Ray,

On Fri, Feb 06, 2015 at 05:28:26PM -0800, Ray Jui wrote:
> Add initial support to the Broadcom iProc I2C controller found in the
> iProc family of SoCs.
> 
> The iProc I2C controller has separate internal TX and RX FIFOs, each has
> a size of 64 bytes. The iProc I2C controller supports two bus speeds
> including standard mode (100kHz) and fast mode (400kHz)

Mostly looking good.

> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/i2c.h>
> +#include <linux/interrupt.h>
> +#include <linux/platform_device.h>
> +#include <linux/io.h>
> +#include <linux/slab.h>
> +#include <linux/delay.h>

Please sort the includes.

> +static bool bcm_iproc_i2c_bus_busy(struct bcm_iproc_i2c_dev *iproc_i2c)
> +{
> +	if (readl(iproc_i2c->base + M_CMD_OFFSET) &
> +	    (1 << M_CMD_START_BUSY_SHIFT))
> +		return true;
> +	else
> +		return false;
> +}

Minor: return !!(readl(...))? You decide.

> +
> +static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *iproc_i2c,
> +				     struct i2c_msg *msg, u8 *addr)
> +{
> +	*addr = msg->addr << 1;
> +
> +	if (msg->flags & I2C_M_RD)
> +		*addr |= 1;
> +
> +	return 0;
> +}

I'd suggest a oneliner.

*addr = msg->addr << 1 | (msg->flags & I2C_M_RD ? 1 : 0)

Or use !! like above.

Don't do an extra function for that. It is only used once and it also
doesn't need to be int since it can't fail anyhow.

(Note to self: I should make a macro for that in i2c.h)

> +	/* need to reserve one byte in the FIFO for the slave address */
> +	if (msg->len > M_TX_RX_FIFO_SIZE - 1) {
> +		dev_err(iproc_i2c->device,
> +			"only support data length up to %u bytes\n",
> +			M_TX_RX_FIFO_SIZE - 1);
> +		return -EINVAL;

-EOPNOTSUPP

Is it really a HW limitation? Could the driver later be extended to
continue filling the FIFO if a certain threshold is reached?

> +	dev_dbg(iproc_i2c->device, "xfer %c, addr=0x%02x, len=%d\n",
> +		(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
> +		msg->len);
> +	dev_dbg(iproc_i2c->device, "*** data: %*ph\n", msg->len, msg->buf);

Not really needed. We have tracing for that.

> +	if (bus_speed < 100000) {
> +		dev_err(iproc_i2c->device, "%d Hz bus speed not supported\n",
> +			bus_speed);
> +		dev_err(iproc_i2c->device,
> +			"valid speeds are 100khz and 400khz\n");
> +		return -EINVAL;
> +	} else if (bus_speed < 400000) {
> +		bus_speed = 100000;
> +		speed_bit = 0;
> +	} else {
> +		bus_speed = 400000;
> +		speed_bit = 1;
> +	}
> +
> +	val = readl(iproc_i2c->base + TIM_CFG_OFFSET);
> +	val &= ~(1 << TIM_CFG_MODE_400_SHIFT);
> +	val |= speed_bit << TIM_CFG_MODE_400_SHIFT;

val |= (bus_speed == 400000) ...

and skip speed_bit? You decide.

> +static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *iproc_i2c)
> +{
> +	u32 val;
> +
> +	val = readl(iproc_i2c->base + CFG_OFFSET);
> +	val |= 1 << CFG_EN_SHIFT;
> +	writel(val, iproc_i2c->base + CFG_OFFSET);
> +}
> +
> +static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *iproc_i2c)
> +{
> +	u32 val;
> +
> +	val = readl(iproc_i2c->base + CFG_OFFSET);
> +	val &= ~(1 << CFG_EN_SHIFT);
> +	writel(val, iproc_i2c->base + CFG_OFFSET);
> +}

Extra functions? They are self explaining and only used once. You
decide.

Rest looks fine, thanks!

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Re: [PATCH v8 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 2/7/2015 9:50 AM, Wolfram Sang wrote:
> Hi Ray,
> 
> On Fri, Feb 06, 2015 at 05:28:26PM -0800, Ray Jui wrote:
>> Add initial support to the Broadcom iProc I2C controller found in the
>> iProc family of SoCs.
>>
>> The iProc I2C controller has separate internal TX and RX FIFOs, each has
>> a size of 64 bytes. The iProc I2C controller supports two bus speeds
>> including standard mode (100kHz) and fast mode (400kHz)
> 
> Mostly looking good.
> 
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/i2c.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/io.h>
>> +#include <linux/slab.h>
>> +#include <linux/delay.h>
> 
> Please sort the includes.
> 

Will do.

>> +static bool bcm_iproc_i2c_bus_busy(struct bcm_iproc_i2c_dev *iproc_i2c)
>> +{
>> +	if (readl(iproc_i2c->base + M_CMD_OFFSET) &
>> +	    (1 << M_CMD_START_BUSY_SHIFT))
>> +		return true;
>> +	else
>> +		return false;
>> +}
> 
> Minor: return !!(readl(...))? You decide.
> 

Okay will do that. Will also remove this function since now it becomes
one line and is used only once.

>> +
>> +static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *iproc_i2c,
>> +				     struct i2c_msg *msg, u8 *addr)
>> +{
>> +	*addr = msg->addr << 1;
>> +
>> +	if (msg->flags & I2C_M_RD)
>> +		*addr |= 1;
>> +
>> +	return 0;
>> +}
> 
> I'd suggest a oneliner.
> 
> *addr = msg->addr << 1 | (msg->flags & I2C_M_RD ? 1 : 0)
> 
> Or use !! like above.
> 
> Don't do an extra function for that. It is only used once and it also
> doesn't need to be int since it can't fail anyhow.
> 
> (Note to self: I should make a macro for that in i2c.h)
> 

Yes will change. Thanks.

>> +	/* need to reserve one byte in the FIFO for the slave address */
>> +	if (msg->len > M_TX_RX_FIFO_SIZE - 1) {
>> +		dev_err(iproc_i2c->device,
>> +			"only support data length up to %u bytes\n",
>> +			M_TX_RX_FIFO_SIZE - 1);
>> +		return -EINVAL;
> 
> -EOPNOTSUPP
> 
> Is it really a HW limitation? Could the driver later be extended to
> continue filling the FIFO if a certain threshold is reached?
> 

Will return -EOPNOTSUPP. This really depends on whether or not we expect
one sequence of START + SLV ADDR + DATA + STOP per i2c message. I can
later extend the driver to refill/re-drain the FIFO for data size >= 64
bytes, if one sequence of SATRT...STOP per message is not a requirement.

>> +	dev_dbg(iproc_i2c->device, "xfer %c, addr=0x%02x, len=%d\n",
>> +		(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
>> +		msg->len);
>> +	dev_dbg(iproc_i2c->device, "*** data: %*ph\n", msg->len, msg->buf);
> 
> Not really needed. We have tracing for that.
> 

Will remove.

>> +	if (bus_speed < 100000) {
>> +		dev_err(iproc_i2c->device, "%d Hz bus speed not supported\n",
>> +			bus_speed);
>> +		dev_err(iproc_i2c->device,
>> +			"valid speeds are 100khz and 400khz\n");
>> +		return -EINVAL;
>> +	} else if (bus_speed < 400000) {
>> +		bus_speed = 100000;
>> +		speed_bit = 0;
>> +	} else {
>> +		bus_speed = 400000;
>> +		speed_bit = 1;
>> +	}
>> +
>> +	val = readl(iproc_i2c->base + TIM_CFG_OFFSET);
>> +	val &= ~(1 << TIM_CFG_MODE_400_SHIFT);
>> +	val |= speed_bit << TIM_CFG_MODE_400_SHIFT;
> 
> val |= (bus_speed == 400000) ...
> 
> and skip speed_bit? You decide.
> 

Okay, I'll get rid of speed_bit.

>> +static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *iproc_i2c)
>> +{
>> +	u32 val;
>> +
>> +	val = readl(iproc_i2c->base + CFG_OFFSET);
>> +	val |= 1 << CFG_EN_SHIFT;
>> +	writel(val, iproc_i2c->base + CFG_OFFSET);
>> +}
>> +
>> +static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *iproc_i2c)
>> +{
>> +	u32 val;
>> +
>> +	val = readl(iproc_i2c->base + CFG_OFFSET);
>> +	val &= ~(1 << CFG_EN_SHIFT);
>> +	writel(val, iproc_i2c->base + CFG_OFFSET);
>> +}
> 
> Extra functions? They are self explaining and only used once. You
> decide.

In fact I'll keep the function, since it will likely be needed later
when we add suspend/resume support to the driver. But I'll combine the
two functions and make it a single function called
bcm_iproc_i2c_enable_disable.

> 
> Rest looks fine, thanks!
> 

Thanks for the review!

Ray

Re: [PATCH v8 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 2/7/2015 9:50 AM, Wolfram Sang wrote:
> Hi Ray,
> 
> On Fri, Feb 06, 2015 at 05:28:26PM -0800, Ray Jui wrote:
>> Add initial support to the Broadcom iProc I2C controller found in the
>> iProc family of SoCs.
>>
>> The iProc I2C controller has separate internal TX and RX FIFOs, each has
>> a size of 64 bytes. The iProc I2C controller supports two bus speeds
>> including standard mode (100kHz) and fast mode (400kHz)
> 
> Mostly looking good.
> 
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/i2c.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/io.h>
>> +#include <linux/slab.h>
>> +#include <linux/delay.h>
> 
> Please sort the includes.
> 

Will do.

>> +static bool bcm_iproc_i2c_bus_busy(struct bcm_iproc_i2c_dev *iproc_i2c)
>> +{
>> +	if (readl(iproc_i2c->base + M_CMD_OFFSET) &
>> +	    (1 << M_CMD_START_BUSY_SHIFT))
>> +		return true;
>> +	else
>> +		return false;
>> +}
> 
> Minor: return !!(readl(...))? You decide.
> 

Okay will do that. Will also remove this function since now it becomes
one line and is used only once.

>> +
>> +static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *iproc_i2c,
>> +				     struct i2c_msg *msg, u8 *addr)
>> +{
>> +	*addr = msg->addr << 1;
>> +
>> +	if (msg->flags & I2C_M_RD)
>> +		*addr |= 1;
>> +
>> +	return 0;
>> +}
> 
> I'd suggest a oneliner.
> 
> *addr = msg->addr << 1 | (msg->flags & I2C_M_RD ? 1 : 0)
> 
> Or use !! like above.
> 
> Don't do an extra function for that. It is only used once and it also
> doesn't need to be int since it can't fail anyhow.
> 
> (Note to self: I should make a macro for that in i2c.h)
> 

Yes will change. Thanks.

>> +	/* need to reserve one byte in the FIFO for the slave address */
>> +	if (msg->len > M_TX_RX_FIFO_SIZE - 1) {
>> +		dev_err(iproc_i2c->device,
>> +			"only support data length up to %u bytes\n",
>> +			M_TX_RX_FIFO_SIZE - 1);
>> +		return -EINVAL;
> 
> -EOPNOTSUPP
> 
> Is it really a HW limitation? Could the driver later be extended to
> continue filling the FIFO if a certain threshold is reached?
> 

Will return -EOPNOTSUPP. This really depends on whether or not we expect
one sequence of START + SLV ADDR + DATA + STOP per i2c message. I can
later extend the driver to refill/re-drain the FIFO for data size >= 64
bytes, if one sequence of SATRT...STOP per message is not a requirement.

>> +	dev_dbg(iproc_i2c->device, "xfer %c, addr=0x%02x, len=%d\n",
>> +		(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
>> +		msg->len);
>> +	dev_dbg(iproc_i2c->device, "*** data: %*ph\n", msg->len, msg->buf);
> 
> Not really needed. We have tracing for that.
> 

Will remove.

>> +	if (bus_speed < 100000) {
>> +		dev_err(iproc_i2c->device, "%d Hz bus speed not supported\n",
>> +			bus_speed);
>> +		dev_err(iproc_i2c->device,
>> +			"valid speeds are 100khz and 400khz\n");
>> +		return -EINVAL;
>> +	} else if (bus_speed < 400000) {
>> +		bus_speed = 100000;
>> +		speed_bit = 0;
>> +	} else {
>> +		bus_speed = 400000;
>> +		speed_bit = 1;
>> +	}
>> +
>> +	val = readl(iproc_i2c->base + TIM_CFG_OFFSET);
>> +	val &= ~(1 << TIM_CFG_MODE_400_SHIFT);
>> +	val |= speed_bit << TIM_CFG_MODE_400_SHIFT;
> 
> val |= (bus_speed == 400000) ...
> 
> and skip speed_bit? You decide.
> 

Okay, I'll get rid of speed_bit.

>> +static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *iproc_i2c)
>> +{
>> +	u32 val;
>> +
>> +	val = readl(iproc_i2c->base + CFG_OFFSET);
>> +	val |= 1 << CFG_EN_SHIFT;
>> +	writel(val, iproc_i2c->base + CFG_OFFSET);
>> +}
>> +
>> +static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *iproc_i2c)
>> +{
>> +	u32 val;
>> +
>> +	val = readl(iproc_i2c->base + CFG_OFFSET);
>> +	val &= ~(1 << CFG_EN_SHIFT);
>> +	writel(val, iproc_i2c->base + CFG_OFFSET);
>> +}
> 
> Extra functions? They are self explaining and only used once. You
> decide.

In fact I'll keep the function, since it will likely be needed later
when we add suspend/resume support to the driver. But I'll combine the
two functions and make it a single function called
bcm_iproc_i2c_enable_disable.

> 
> Rest looks fine, thanks!
> 

Thanks for the review!

Ray
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[PATCH v8 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 2/7/2015 9:50 AM, Wolfram Sang wrote:
> Hi Ray,
> 
> On Fri, Feb 06, 2015 at 05:28:26PM -0800, Ray Jui wrote:
>> Add initial support to the Broadcom iProc I2C controller found in the
>> iProc family of SoCs.
>>
>> The iProc I2C controller has separate internal TX and RX FIFOs, each has
>> a size of 64 bytes. The iProc I2C controller supports two bus speeds
>> including standard mode (100kHz) and fast mode (400kHz)
> 
> Mostly looking good.
> 
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/i2c.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/io.h>
>> +#include <linux/slab.h>
>> +#include <linux/delay.h>
> 
> Please sort the includes.
> 

Will do.

>> +static bool bcm_iproc_i2c_bus_busy(struct bcm_iproc_i2c_dev *iproc_i2c)
>> +{
>> +	if (readl(iproc_i2c->base + M_CMD_OFFSET) &
>> +	    (1 << M_CMD_START_BUSY_SHIFT))
>> +		return true;
>> +	else
>> +		return false;
>> +}
> 
> Minor: return !!(readl(...))? You decide.
> 

Okay will do that. Will also remove this function since now it becomes
one line and is used only once.

>> +
>> +static int bcm_iproc_i2c_format_addr(struct bcm_iproc_i2c_dev *iproc_i2c,
>> +				     struct i2c_msg *msg, u8 *addr)
>> +{
>> +	*addr = msg->addr << 1;
>> +
>> +	if (msg->flags & I2C_M_RD)
>> +		*addr |= 1;
>> +
>> +	return 0;
>> +}
> 
> I'd suggest a oneliner.
> 
> *addr = msg->addr << 1 | (msg->flags & I2C_M_RD ? 1 : 0)
> 
> Or use !! like above.
> 
> Don't do an extra function for that. It is only used once and it also
> doesn't need to be int since it can't fail anyhow.
> 
> (Note to self: I should make a macro for that in i2c.h)
> 

Yes will change. Thanks.

>> +	/* need to reserve one byte in the FIFO for the slave address */
>> +	if (msg->len > M_TX_RX_FIFO_SIZE - 1) {
>> +		dev_err(iproc_i2c->device,
>> +			"only support data length up to %u bytes\n",
>> +			M_TX_RX_FIFO_SIZE - 1);
>> +		return -EINVAL;
> 
> -EOPNOTSUPP
> 
> Is it really a HW limitation? Could the driver later be extended to
> continue filling the FIFO if a certain threshold is reached?
> 

Will return -EOPNOTSUPP. This really depends on whether or not we expect
one sequence of START + SLV ADDR + DATA + STOP per i2c message. I can
later extend the driver to refill/re-drain the FIFO for data size >= 64
bytes, if one sequence of SATRT...STOP per message is not a requirement.

>> +	dev_dbg(iproc_i2c->device, "xfer %c, addr=0x%02x, len=%d\n",
>> +		(msg->flags & I2C_M_RD) ? 'R' : 'W', msg->addr,
>> +		msg->len);
>> +	dev_dbg(iproc_i2c->device, "*** data: %*ph\n", msg->len, msg->buf);
> 
> Not really needed. We have tracing for that.
> 

Will remove.

>> +	if (bus_speed < 100000) {
>> +		dev_err(iproc_i2c->device, "%d Hz bus speed not supported\n",
>> +			bus_speed);
>> +		dev_err(iproc_i2c->device,
>> +			"valid speeds are 100khz and 400khz\n");
>> +		return -EINVAL;
>> +	} else if (bus_speed < 400000) {
>> +		bus_speed = 100000;
>> +		speed_bit = 0;
>> +	} else {
>> +		bus_speed = 400000;
>> +		speed_bit = 1;
>> +	}
>> +
>> +	val = readl(iproc_i2c->base + TIM_CFG_OFFSET);
>> +	val &= ~(1 << TIM_CFG_MODE_400_SHIFT);
>> +	val |= speed_bit << TIM_CFG_MODE_400_SHIFT;
> 
> val |= (bus_speed == 400000) ...
> 
> and skip speed_bit? You decide.
> 

Okay, I'll get rid of speed_bit.

>> +static void bcm_iproc_i2c_enable(struct bcm_iproc_i2c_dev *iproc_i2c)
>> +{
>> +	u32 val;
>> +
>> +	val = readl(iproc_i2c->base + CFG_OFFSET);
>> +	val |= 1 << CFG_EN_SHIFT;
>> +	writel(val, iproc_i2c->base + CFG_OFFSET);
>> +}
>> +
>> +static void bcm_iproc_i2c_disable(struct bcm_iproc_i2c_dev *iproc_i2c)
>> +{
>> +	u32 val;
>> +
>> +	val = readl(iproc_i2c->base + CFG_OFFSET);
>> +	val &= ~(1 << CFG_EN_SHIFT);
>> +	writel(val, iproc_i2c->base + CFG_OFFSET);
>> +}
> 
> Extra functions? They are self explaining and only used once. You
> decide.

In fact I'll keep the function, since it will likely be needed later
when we add suspend/resume support to the driver. But I'll combine the
two functions and make it a single function called
bcm_iproc_i2c_enable_disable.

> 
> Rest looks fine, thanks!
> 

Thanks for the review!

Ray

[PATCH v9 0/3] Add I2C support to Broadcom iProc

[Ray Jui]

This patchset contains the initial I2C support for Broadcom iProc family of
SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has a
size of 64 bytes. The iProc I2C controller supports two bus speeds including
standard mode (100 kHz) and fast mode (400 kHz)

Synced code base to Linux 3.19-rc7

Changes from v8:
 - Sort header includes in alphabetical order
 - Use correct error code
 - Get rid of redundant functions and combine functions to make driver more
   slim
 - Get rid of redundant debugging prints that are already available from the
   I2C framework
 - Other minor improvements

Changes from v7:
 - Remove redundant 10-bit address check in the driver
 - Fix the driver that accidentally emits 1-byte of data with zero content in
   the case of SMBUS quick command
 - Improve debugging prints in the driver
 - Other minor improvements

Changes from v6:
 - Get rid of unnecessary atomic variable usage in the driver
 - Improve the "waiting for transaction to complete" logic further by making
   sure there's no pending/ongoing interrupt by the time when flag
   'xfer_is_done' is checked
 - After disabling interrupt with 'writel', add 'readl' to the same register
   to flush the bus to ensure the write has gone through

Changes from v5:
 - Improve the "waiting for transaction to be complete" logic to take care of
   the corner case when an interrupt fires after wait_for_completion_timeout
   times out
 - Improve the logic to disable I2C interrupt in the remove function. Make it
   more generic so it works for both dedicated and shared interrupt

Changes from v4:
 - Remove redundant header file includes
 - Change the logic that waits for the host controller to be idle to
   simply return -EBUSY
 - Use proper print level and error codes in the driver
 - Allow zero length message in the driver to support I2C_SMBUS_QUICK
 - Change back to use devm_request_irq. Disable interrupt in the remove
   function so there's no outstanding I2C interrupt when the driver is
   being removed from the framework
 - Other minor miscellaneous improvements and fixes

Changes from v3:
 - Add config dependency to COMPILE_TEST to allow the driver to be build tested
   by other platforms
 - Improve CPU utilization efficiency in the loop of waiting for bus to idle
 - Add more comment in the driver to clarify the way how the "start busy"
   interrupt is triggered from the I2C controller
 - Fix inconsistent coding style and format
 - Improve the bus speed validation logic in the driver
 - Add code to free the interrupt line in driver's remove function. Also
   change to use non-devm API to request the interrupt line
 - Other miscellaneous improvements and fixes

Changes from v2:
 - Have the I2C driver default to y so it does not need to be selected from
   ARCH_BCM_IPROC. This also helps to get rid of one patch. The driver still
   depends on ARCH_BCM_IPROC
 - Get rid of redundant check on resource returned by platform_get_resource

Changes from v1:
 - Fix function argument parenthesis
 - Get rid of redundant driver owner field

Ray Jui (3):
  i2c: iProc: define Broadcom iProc I2C binding
  i2c: iproc: Add Broadcom iProc I2C Driver
  ARM: dts: add I2C device nodes for Broadcom Cygnus

 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   20 +
 drivers/i2c/busses/Kconfig                         |   10 +
 drivers/i2c/busses/Makefile                        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c                 |  461 ++++++++++++++++++++
 5 files changed, 529 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

-- 
1.7.9.5

[PATCH v9 0/3] Add I2C support to Broadcom iProc

[Ray Jui]

This patchset contains the initial I2C support for Broadcom iProc family of
SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has a
size of 64 bytes. The iProc I2C controller supports two bus speeds including
standard mode (100 kHz) and fast mode (400 kHz)

Synced code base to Linux 3.19-rc7

Changes from v8:
 - Sort header includes in alphabetical order
 - Use correct error code
 - Get rid of redundant functions and combine functions to make driver more
   slim
 - Get rid of redundant debugging prints that are already available from the
   I2C framework
 - Other minor improvements

Changes from v7:
 - Remove redundant 10-bit address check in the driver
 - Fix the driver that accidentally emits 1-byte of data with zero content in
   the case of SMBUS quick command
 - Improve debugging prints in the driver
 - Other minor improvements

Changes from v6:
 - Get rid of unnecessary atomic variable usage in the driver
 - Improve the "waiting for transaction to complete" logic further by making
   sure there's no pending/ongoing interrupt by the time when flag
   'xfer_is_done' is checked
 - After disabling interrupt with 'writel', add 'readl' to the same register
   to flush the bus to ensure the write has gone through

Changes from v5:
 - Improve the "waiting for transaction to be complete" logic to take care of
   the corner case when an interrupt fires after wait_for_completion_timeout
   times out
 - Improve the logic to disable I2C interrupt in the remove function. Make it
   more generic so it works for both dedicated and shared interrupt

Changes from v4:
 - Remove redundant header file includes
 - Change the logic that waits for the host controller to be idle to
   simply return -EBUSY
 - Use proper print level and error codes in the driver
 - Allow zero length message in the driver to support I2C_SMBUS_QUICK
 - Change back to use devm_request_irq. Disable interrupt in the remove
   function so there's no outstanding I2C interrupt when the driver is
   being removed from the framework
 - Other minor miscellaneous improvements and fixes

Changes from v3:
 - Add config dependency to COMPILE_TEST to allow the driver to be build tested
   by other platforms
 - Improve CPU utilization efficiency in the loop of waiting for bus to idle
 - Add more comment in the driver to clarify the way how the "start busy"
   interrupt is triggered from the I2C controller
 - Fix inconsistent coding style and format
 - Improve the bus speed validation logic in the driver
 - Add code to free the interrupt line in driver's remove function. Also
   change to use non-devm API to request the interrupt line
 - Other miscellaneous improvements and fixes

Changes from v2:
 - Have the I2C driver default to y so it does not need to be selected from
   ARCH_BCM_IPROC. This also helps to get rid of one patch. The driver still
   depends on ARCH_BCM_IPROC
 - Get rid of redundant check on resource returned by platform_get_resource

Changes from v1:
 - Fix function argument parenthesis
 - Get rid of redundant driver owner field

Ray Jui (3):
  i2c: iProc: define Broadcom iProc I2C binding
  i2c: iproc: Add Broadcom iProc I2C Driver
  ARM: dts: add I2C device nodes for Broadcom Cygnus

 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   20 +
 drivers/i2c/busses/Kconfig                         |   10 +
 drivers/i2c/busses/Makefile                        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c                 |  461 ++++++++++++++++++++
 5 files changed, 529 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

-- 
1.7.9.5

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[PATCH v9 0/3] Add I2C support to Broadcom iProc

[Ray Jui]

This patchset contains the initial I2C support for Broadcom iProc family of
SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has a
size of 64 bytes. The iProc I2C controller supports two bus speeds including
standard mode (100 kHz) and fast mode (400 kHz)

Synced code base to Linux 3.19-rc7

Changes from v8:
 - Sort header includes in alphabetical order
 - Use correct error code
 - Get rid of redundant functions and combine functions to make driver more
   slim
 - Get rid of redundant debugging prints that are already available from the
   I2C framework
 - Other minor improvements

Changes from v7:
 - Remove redundant 10-bit address check in the driver
 - Fix the driver that accidentally emits 1-byte of data with zero content in
   the case of SMBUS quick command
 - Improve debugging prints in the driver
 - Other minor improvements

Changes from v6:
 - Get rid of unnecessary atomic variable usage in the driver
 - Improve the "waiting for transaction to complete" logic further by making
   sure there's no pending/ongoing interrupt by the time when flag
   'xfer_is_done' is checked
 - After disabling interrupt with 'writel', add 'readl' to the same register
   to flush the bus to ensure the write has gone through

Changes from v5:
 - Improve the "waiting for transaction to be complete" logic to take care of
   the corner case when an interrupt fires after wait_for_completion_timeout
   times out
 - Improve the logic to disable I2C interrupt in the remove function. Make it
   more generic so it works for both dedicated and shared interrupt

Changes from v4:
 - Remove redundant header file includes
 - Change the logic that waits for the host controller to be idle to
   simply return -EBUSY
 - Use proper print level and error codes in the driver
 - Allow zero length message in the driver to support I2C_SMBUS_QUICK
 - Change back to use devm_request_irq. Disable interrupt in the remove
   function so there's no outstanding I2C interrupt when the driver is
   being removed from the framework
 - Other minor miscellaneous improvements and fixes

Changes from v3:
 - Add config dependency to COMPILE_TEST to allow the driver to be build tested
   by other platforms
 - Improve CPU utilization efficiency in the loop of waiting for bus to idle
 - Add more comment in the driver to clarify the way how the "start busy"
   interrupt is triggered from the I2C controller
 - Fix inconsistent coding style and format
 - Improve the bus speed validation logic in the driver
 - Add code to free the interrupt line in driver's remove function. Also
   change to use non-devm API to request the interrupt line
 - Other miscellaneous improvements and fixes

Changes from v2:
 - Have the I2C driver default to y so it does not need to be selected from
   ARCH_BCM_IPROC. This also helps to get rid of one patch. The driver still
   depends on ARCH_BCM_IPROC
 - Get rid of redundant check on resource returned by platform_get_resource

Changes from v1:
 - Fix function argument parenthesis
 - Get rid of redundant driver owner field

Ray Jui (3):
  i2c: iProc: define Broadcom iProc I2C binding
  i2c: iproc: Add Broadcom iProc I2C Driver
  ARM: dts: add I2C device nodes for Broadcom Cygnus

 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++
 arch/arm/boot/dts/bcm-cygnus.dtsi                  |   20 +
 drivers/i2c/busses/Kconfig                         |   10 +
 drivers/i2c/busses/Makefile                        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c                 |  461 ++++++++++++++++++++
 5 files changed, 529 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

-- 
1.7.9.5

[PATCH v9 1/3] i2c: iProc: define Broadcom iProc I2C binding

[Ray Jui]

Document the I2C device tree binding for Broadcom iProc family of
SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Reviewed-by: Kevin Cernekee <cernekee@chromium.org>
---
 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt

diff --git a/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
new file mode 100644
index 0000000..81f982c
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
@@ -0,0 +1,37 @@
+Broadcom iProc I2C controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,iproc-i2c"
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+    I2C controller registers
+
+- interrupts:
+    Should contain the I2C interrupt
+
+- clock-frequency:
+    This is the I2C bus clock. Need to be either 100000 or 400000
+
+- #address-cells:
+    Always 1 (for I2C addresses)
+
+- #size-cells:
+    Always 0
+
+Example:
+	i2c0: i2c@18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+
+		codec: wm8750@1a {
+			compatible = "wlf,wm8750";
+			reg = <0x1a>;
+		};
+	};
-- 
1.7.9.5

[PATCH v9 1/3] i2c: iProc: define Broadcom iProc I2C binding

[Ray Jui]

Document the I2C device tree binding for Broadcom iProc family of
SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Reviewed-by: Kevin Cernekee <cernekee@chromium.org>
---
 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt

diff --git a/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
new file mode 100644
index 0000000..81f982c
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
@@ -0,0 +1,37 @@
+Broadcom iProc I2C controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,iproc-i2c"
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+    I2C controller registers
+
+- interrupts:
+    Should contain the I2C interrupt
+
+- clock-frequency:
+    This is the I2C bus clock. Need to be either 100000 or 400000
+
+- #address-cells:
+    Always 1 (for I2C addresses)
+
+- #size-cells:
+    Always 0
+
+Example:
+	i2c0: i2c@18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+
+		codec: wm8750@1a {
+			compatible = "wlf,wm8750";
+			reg = <0x1a>;
+		};
+	};
-- 
1.7.9.5

[PATCH v9 1/3] i2c: iProc: define Broadcom iProc I2C binding

[Ray Jui]

Document the I2C device tree binding for Broadcom iProc family of
SoCs

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Reviewed-by: Kevin Cernekee <cernekee@chromium.org>
---
 .../devicetree/bindings/i2c/brcm,iproc-i2c.txt     |   37 ++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt

diff --git a/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
new file mode 100644
index 0000000..81f982c
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
@@ -0,0 +1,37 @@
+Broadcom iProc I2C controller
+
+Required properties:
+
+- compatible:
+    Must be "brcm,iproc-i2c"
+
+- reg:
+    Define the base and range of the I/O address space that contain the iProc
+    I2C controller registers
+
+- interrupts:
+    Should contain the I2C interrupt
+
+- clock-frequency:
+    This is the I2C bus clock. Need to be either 100000 or 400000
+
+- #address-cells:
+    Always 1 (for I2C addresses)
+
+- #size-cells:
+    Always 0
+
+Example:
+	i2c0: i2c at 18008000 {
+		compatible = "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+
+		codec: wm8750 at 1a {
+			compatible = "wlf,wm8750";
+			reg = <0x1a>;
+		};
+	};
-- 
1.7.9.5

[PATCH v9 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

Add initial support to the Broadcom iProc I2C controller found in the
iProc family of SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has
a size of 64 bytes. The iProc I2C controller supports two bus speeds
including standard mode (100kHz) and fast mode (400kHz)

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Reviewed-by: Kevin Cernekee <cernekee@chromium.org>
---
 drivers/i2c/busses/Kconfig         |   10 +
 drivers/i2c/busses/Makefile        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c |  461 ++++++++++++++++++++++++++++++++++++
 3 files changed, 472 insertions(+)
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index ab838d9..3d08731 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -372,6 +372,16 @@ config I2C_BCM2835
 	  This support is also available as a module.  If so, the module
 	  will be called i2c-bcm2835.
 
+config I2C_BCM_IPROC
+	tristate "Broadcom iProc I2C controller"
+	depends on ARCH_BCM_IPROC || COMPILE_TEST
+	default ARCH_BCM_IPROC
+	help
+	  If you say yes to this option, support will be included for the
+	  Broadcom iProc I2C controller.
+
+	  If you don't know what to do here, say N.
+
 config I2C_BCM_KONA
 	tristate "BCM Kona I2C adapter"
 	depends on ARCH_BCM_MOBILE
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 56388f6..d93b509 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
 obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
 obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
 obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
+obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
 obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
 obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
 obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
new file mode 100644
index 0000000..d3c8915
--- /dev/null
+++ b/drivers/i2c/busses/i2c-bcm-iproc.c
@@ -0,0 +1,461 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#define CFG_OFFSET                   0x00
+#define CFG_RESET_SHIFT              31
+#define CFG_EN_SHIFT                 30
+#define CFG_M_RETRY_CNT_SHIFT        16
+#define CFG_M_RETRY_CNT_MASK         0x0f
+
+#define TIM_CFG_OFFSET               0x04
+#define TIM_CFG_MODE_400_SHIFT       31
+
+#define M_FIFO_CTRL_OFFSET           0x0c
+#define M_FIFO_RX_FLUSH_SHIFT        31
+#define M_FIFO_TX_FLUSH_SHIFT        30
+#define M_FIFO_RX_CNT_SHIFT          16
+#define M_FIFO_RX_CNT_MASK           0x7f
+#define M_FIFO_RX_THLD_SHIFT         8
+#define M_FIFO_RX_THLD_MASK          0x3f
+
+#define M_CMD_OFFSET                 0x30
+#define M_CMD_START_BUSY_SHIFT       31
+#define M_CMD_STATUS_SHIFT           25
+#define M_CMD_STATUS_MASK            0x07
+#define M_CMD_STATUS_SUCCESS         0x0
+#define M_CMD_STATUS_LOST_ARB        0x1
+#define M_CMD_STATUS_NACK_ADDR       0x2
+#define M_CMD_STATUS_NACK_DATA       0x3
+#define M_CMD_STATUS_TIMEOUT         0x4
+#define M_CMD_PROTOCOL_SHIFT         9
+#define M_CMD_PROTOCOL_MASK          0xf
+#define M_CMD_PROTOCOL_BLK_WR        0x7
+#define M_CMD_PROTOCOL_BLK_RD        0x8
+#define M_CMD_PEC_SHIFT              8
+#define M_CMD_RD_CNT_SHIFT           0
+#define M_CMD_RD_CNT_MASK            0xff
+
+#define IE_OFFSET                    0x38
+#define IE_M_RX_FIFO_FULL_SHIFT      31
+#define IE_M_RX_THLD_SHIFT           30
+#define IE_M_START_BUSY_SHIFT        28
+
+#define IS_OFFSET                    0x3c
+#define IS_M_RX_FIFO_FULL_SHIFT      31
+#define IS_M_RX_THLD_SHIFT           30
+#define IS_M_START_BUSY_SHIFT        28
+
+#define M_TX_OFFSET                  0x40
+#define M_TX_WR_STATUS_SHIFT         31
+#define M_TX_DATA_SHIFT              0
+#define M_TX_DATA_MASK               0xff
+
+#define M_RX_OFFSET                  0x44
+#define M_RX_STATUS_SHIFT            30
+#define M_RX_STATUS_MASK             0x03
+#define M_RX_PEC_ERR_SHIFT           29
+#define M_RX_DATA_SHIFT              0
+#define M_RX_DATA_MASK               0xff
+
+#define I2C_TIMEOUT_MESC             100
+#define M_TX_RX_FIFO_SIZE            64
+
+enum bus_speed_index {
+	I2C_SPD_100K = 0,
+	I2C_SPD_400K,
+};
+
+struct bcm_iproc_i2c_dev {
+	struct device *device;
+	int irq;
+
+	void __iomem *base;
+
+	struct i2c_adapter adapter;
+
+	struct completion done;
+	int xfer_is_done;
+};
+
+/*
+ * Can be expanded in the future if more interrupt status bits are utilized
+ */
+#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
+
+static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = data;
+	u32 status = readl(iproc_i2c->base + IS_OFFSET);
+
+	status &= ISR_MASK;
+
+	if (!status)
+		return IRQ_NONE;
+
+	writel(status, iproc_i2c->base + IS_OFFSET);
+	iproc_i2c->xfer_is_done = 1;
+	complete_all(&iproc_i2c->done);
+
+	return IRQ_HANDLED;
+}
+
+static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *iproc_i2c,
+				      struct i2c_msg *msg)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + M_CMD_OFFSET);
+	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
+
+	switch (val) {
+	case M_CMD_STATUS_SUCCESS:
+		return 0;
+
+	case M_CMD_STATUS_LOST_ARB:
+		dev_dbg(iproc_i2c->device, "lost bus arbitration\n");
+		return -EAGAIN;
+
+	case M_CMD_STATUS_NACK_ADDR:
+		dev_dbg(iproc_i2c->device, "NAK addr:0x%02x\n", msg->addr);
+		return -ENXIO;
+
+	case M_CMD_STATUS_NACK_DATA:
+		dev_dbg(iproc_i2c->device, "NAK data\n");
+		return -ENXIO;
+
+	case M_CMD_STATUS_TIMEOUT:
+		dev_dbg(iproc_i2c->device, "bus timeout\n");
+		return -ETIMEDOUT;
+
+	default:
+		dev_dbg(iproc_i2c->device, "unknown error code=%d\n", val);
+		return -EIO;
+	}
+}
+
+static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *iproc_i2c,
+					 struct i2c_msg *msg)
+{
+	int ret, i;
+	u8 addr;
+	u32 val;
+	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	/* need to reserve one byte in the FIFO for the slave address */
+	if (msg->len > M_TX_RX_FIFO_SIZE - 1) {
+		dev_err(iproc_i2c->device,
+			"only support data length up to %u bytes\n",
+			M_TX_RX_FIFO_SIZE - 1);
+		return -EOPNOTSUPP;
+	}
+
+	/* check if bus is busy */
+	if (!!(readl(iproc_i2c->base + M_CMD_OFFSET) &
+	       BIT(M_CMD_START_BUSY_SHIFT))) {
+		dev_warn(iproc_i2c->device, "bus is busy\n");
+		return -EBUSY;
+	}
+
+	/* format and load slave address into the TX FIFO */
+	addr = msg->addr << 1 | (msg->flags & I2C_M_RD ? 1 : 0);
+	writel(addr, iproc_i2c->base + M_TX_OFFSET);
+
+	/* for a write transaction, load data into the TX FIFO */
+	if (!(msg->flags & I2C_M_RD)) {
+		for (i = 0; i < msg->len; i++) {
+			val = msg->buf[i];
+
+			/* mark the last byte */
+			if (i == msg->len - 1)
+				val |= 1 << M_TX_WR_STATUS_SHIFT;
+
+			writel(val, iproc_i2c->base + M_TX_OFFSET);
+		}
+	}
+
+	/* mark as incomplete before starting the transaction */
+	reinit_completion(&iproc_i2c->done);
+	iproc_i2c->xfer_is_done = 0;
+
+	/*
+	 * Enable the "start busy" interrupt, which will be triggered after the
+	 * transaction is done, i.e., the internal start_busy bit, transitions
+	 * from 1 to 0.
+	 */
+	writel(1 << IE_M_START_BUSY_SHIFT, iproc_i2c->base + IE_OFFSET);
+
+	/*
+	 * Now we can activate the transfer. For a read operation, specify the
+	 * number of bytes to read
+	 */
+	val = 1 << M_CMD_START_BUSY_SHIFT;
+	if (msg->flags & I2C_M_RD) {
+		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
+		       (msg->len << M_CMD_RD_CNT_SHIFT);
+	} else {
+		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
+	}
+	writel(val, iproc_i2c->base + M_CMD_OFFSET);
+
+	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+	/* read it back to flush the write */
+	readl(iproc_i2c->base + IE_OFFSET);
+
+	/* make sure the interrupt handler isn't running */
+	synchronize_irq(iproc_i2c->irq);
+
+	if (!time_left && !iproc_i2c->xfer_is_done) {
+		dev_err(iproc_i2c->device, "transaction timed out\n");
+
+		/* flush FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return -ETIMEDOUT;
+	}
+
+	ret = bcm_iproc_i2c_check_status(iproc_i2c, msg);
+	if (ret) {
+		/* flush both TX/RX FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return ret;
+	}
+
+	/*
+	 * For a read operation, we now need to load the data from FIFO
+	 * into the memory buffer
+	 */
+	if (msg->flags & I2C_M_RD) {
+		for (i = 0; i < msg->len; i++) {
+			msg->buf[i] = (readl(iproc_i2c->base + M_RX_OFFSET) >>
+				      M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
+		}
+	}
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
+			      struct i2c_msg msgs[], int num)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = i2c_get_adapdata(adapter);
+	int ret, i;
+
+	/* go through all messages */
+	for (i = 0; i < num; i++) {
+		ret = bcm_iproc_i2c_xfer_single_msg(iproc_i2c, &msgs[i]);
+		if (ret) {
+			dev_dbg(iproc_i2c->device, "xfer failed\n");
+			return ret;
+		}
+	}
+
+	return num;
+}
+
+static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm bcm_iproc_algo = {
+	.master_xfer = bcm_iproc_i2c_xfer,
+	.functionality = bcm_iproc_i2c_functionality,
+};
+
+static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	unsigned int bus_speed;
+	u32 val;
+	int ret = of_property_read_u32(iproc_i2c->device->of_node,
+				       "clock-frequency", &bus_speed);
+	if (ret < 0) {
+		dev_info(iproc_i2c->device,
+			"unable to interpret clock-frequency DT property\n");
+		bus_speed = 100000;
+	}
+
+	if (bus_speed < 100000) {
+		dev_err(iproc_i2c->device, "%d Hz bus speed not supported\n",
+			bus_speed);
+		dev_err(iproc_i2c->device,
+			"valid speeds are 100khz and 400khz\n");
+		return -EINVAL;
+	} else if (bus_speed < 400000) {
+		bus_speed = 100000;
+	} else {
+		bus_speed = 400000;
+	}
+
+	val = readl(iproc_i2c->base + TIM_CFG_OFFSET);
+	val &= ~(1 << TIM_CFG_MODE_400_SHIFT);
+	val |= (bus_speed == 400000) << TIM_CFG_MODE_400_SHIFT;
+	writel(val, iproc_i2c->base + TIM_CFG_OFFSET);
+
+	dev_info(iproc_i2c->device, "bus set to %u Hz\n", bus_speed);
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	/* put controller in reset */
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val |= 1 << CFG_RESET_SHIFT;
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* wait 100 usec per spec */
+	udelay(100);
+
+	/* bring controller out of reset */
+	val &= ~(1 << CFG_RESET_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
+	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
+	writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+
+	/* clear all pending interrupts */
+	writel(0xffffffff, iproc_i2c->base + IS_OFFSET);
+
+	return 0;
+}
+
+static void bcm_iproc_i2c_enable_disable(struct bcm_iproc_i2c_dev *iproc_i2c,
+					 bool enable)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	if (enable)
+		val |= BIT(CFG_EN_SHIFT);
+	else
+		val &= ~BIT(CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+}
+
+static int bcm_iproc_i2c_probe(struct platform_device *pdev)
+{
+	int irq, ret = 0;
+	struct bcm_iproc_i2c_dev *iproc_i2c;
+	struct i2c_adapter *adap;
+	struct resource *res;
+
+	iproc_i2c = devm_kzalloc(&pdev->dev, sizeof(*iproc_i2c),
+				 GFP_KERNEL);
+	if (!iproc_i2c)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, iproc_i2c);
+	iproc_i2c->device = &pdev->dev;
+	init_completion(&iproc_i2c->done);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	iproc_i2c->base = devm_ioremap_resource(iproc_i2c->device, res);
+	if (IS_ERR(iproc_i2c->base))
+		return PTR_ERR(iproc_i2c->base);
+
+	ret = bcm_iproc_i2c_init(iproc_i2c);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_cfg_speed(iproc_i2c);
+	if (ret)
+		return ret;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq <= 0) {
+		dev_err(iproc_i2c->device, "no irq resource\n");
+		return irq;
+	}
+	iproc_i2c->irq = irq;
+
+	ret = devm_request_irq(iproc_i2c->device, irq, bcm_iproc_i2c_isr, 0,
+			       pdev->name, iproc_i2c);
+	if (ret < 0) {
+		dev_err(iproc_i2c->device, "unable to request irq %i\n", irq);
+		return ret;
+	}
+
+	bcm_iproc_i2c_enable_disable(iproc_i2c, true);
+
+	adap = &iproc_i2c->adapter;
+	i2c_set_adapdata(adap, iproc_i2c);
+	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
+	adap->algo = &bcm_iproc_algo;
+	adap->dev.parent = &pdev->dev;
+	adap->dev.of_node = pdev->dev.of_node;
+
+	ret = i2c_add_adapter(adap);
+	if (ret) {
+		dev_err(iproc_i2c->device, "failed to add adapter\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_remove(struct platform_device *pdev)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
+
+	/* make sure there's no pending interrupt when we remove the adapter */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+	readl(iproc_i2c->base + IE_OFFSET);
+	synchronize_irq(iproc_i2c->irq);
+
+	i2c_del_adapter(&iproc_i2c->adapter);
+	bcm_iproc_i2c_enable_disable(iproc_i2c, false);
+
+	return 0;
+}
+
+static const struct of_device_id bcm_iproc_i2c_of_match[] = {
+	{ .compatible = "brcm,iproc-i2c" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
+
+static struct platform_driver bcm_iproc_i2c_driver = {
+	.driver = {
+		.name = "bcm-iproc-i2c",
+		.of_match_table = bcm_iproc_i2c_of_match,
+	},
+	.probe = bcm_iproc_i2c_probe,
+	.remove = bcm_iproc_i2c_remove,
+};
+module_platform_driver(bcm_iproc_i2c_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v9 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

Add initial support to the Broadcom iProc I2C controller found in the
iProc family of SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has
a size of 64 bytes. The iProc I2C controller supports two bus speeds
including standard mode (100kHz) and fast mode (400kHz)

Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
Reviewed-by: Kevin Cernekee <cernekee-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
---
 drivers/i2c/busses/Kconfig         |   10 +
 drivers/i2c/busses/Makefile        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c |  461 ++++++++++++++++++++++++++++++++++++
 3 files changed, 472 insertions(+)
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index ab838d9..3d08731 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -372,6 +372,16 @@ config I2C_BCM2835
 	  This support is also available as a module.  If so, the module
 	  will be called i2c-bcm2835.
 
+config I2C_BCM_IPROC
+	tristate "Broadcom iProc I2C controller"
+	depends on ARCH_BCM_IPROC || COMPILE_TEST
+	default ARCH_BCM_IPROC
+	help
+	  If you say yes to this option, support will be included for the
+	  Broadcom iProc I2C controller.
+
+	  If you don't know what to do here, say N.
+
 config I2C_BCM_KONA
 	tristate "BCM Kona I2C adapter"
 	depends on ARCH_BCM_MOBILE
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 56388f6..d93b509 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
 obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
 obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
 obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
+obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
 obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
 obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
 obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
new file mode 100644
index 0000000..d3c8915
--- /dev/null
+++ b/drivers/i2c/busses/i2c-bcm-iproc.c
@@ -0,0 +1,461 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#define CFG_OFFSET                   0x00
+#define CFG_RESET_SHIFT              31
+#define CFG_EN_SHIFT                 30
+#define CFG_M_RETRY_CNT_SHIFT        16
+#define CFG_M_RETRY_CNT_MASK         0x0f
+
+#define TIM_CFG_OFFSET               0x04
+#define TIM_CFG_MODE_400_SHIFT       31
+
+#define M_FIFO_CTRL_OFFSET           0x0c
+#define M_FIFO_RX_FLUSH_SHIFT        31
+#define M_FIFO_TX_FLUSH_SHIFT        30
+#define M_FIFO_RX_CNT_SHIFT          16
+#define M_FIFO_RX_CNT_MASK           0x7f
+#define M_FIFO_RX_THLD_SHIFT         8
+#define M_FIFO_RX_THLD_MASK          0x3f
+
+#define M_CMD_OFFSET                 0x30
+#define M_CMD_START_BUSY_SHIFT       31
+#define M_CMD_STATUS_SHIFT           25
+#define M_CMD_STATUS_MASK            0x07
+#define M_CMD_STATUS_SUCCESS         0x0
+#define M_CMD_STATUS_LOST_ARB        0x1
+#define M_CMD_STATUS_NACK_ADDR       0x2
+#define M_CMD_STATUS_NACK_DATA       0x3
+#define M_CMD_STATUS_TIMEOUT         0x4
+#define M_CMD_PROTOCOL_SHIFT         9
+#define M_CMD_PROTOCOL_MASK          0xf
+#define M_CMD_PROTOCOL_BLK_WR        0x7
+#define M_CMD_PROTOCOL_BLK_RD        0x8
+#define M_CMD_PEC_SHIFT              8
+#define M_CMD_RD_CNT_SHIFT           0
+#define M_CMD_RD_CNT_MASK            0xff
+
+#define IE_OFFSET                    0x38
+#define IE_M_RX_FIFO_FULL_SHIFT      31
+#define IE_M_RX_THLD_SHIFT           30
+#define IE_M_START_BUSY_SHIFT        28
+
+#define IS_OFFSET                    0x3c
+#define IS_M_RX_FIFO_FULL_SHIFT      31
+#define IS_M_RX_THLD_SHIFT           30
+#define IS_M_START_BUSY_SHIFT        28
+
+#define M_TX_OFFSET                  0x40
+#define M_TX_WR_STATUS_SHIFT         31
+#define M_TX_DATA_SHIFT              0
+#define M_TX_DATA_MASK               0xff
+
+#define M_RX_OFFSET                  0x44
+#define M_RX_STATUS_SHIFT            30
+#define M_RX_STATUS_MASK             0x03
+#define M_RX_PEC_ERR_SHIFT           29
+#define M_RX_DATA_SHIFT              0
+#define M_RX_DATA_MASK               0xff
+
+#define I2C_TIMEOUT_MESC             100
+#define M_TX_RX_FIFO_SIZE            64
+
+enum bus_speed_index {
+	I2C_SPD_100K = 0,
+	I2C_SPD_400K,
+};
+
+struct bcm_iproc_i2c_dev {
+	struct device *device;
+	int irq;
+
+	void __iomem *base;
+
+	struct i2c_adapter adapter;
+
+	struct completion done;
+	int xfer_is_done;
+};
+
+/*
+ * Can be expanded in the future if more interrupt status bits are utilized
+ */
+#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
+
+static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = data;
+	u32 status = readl(iproc_i2c->base + IS_OFFSET);
+
+	status &= ISR_MASK;
+
+	if (!status)
+		return IRQ_NONE;
+
+	writel(status, iproc_i2c->base + IS_OFFSET);
+	iproc_i2c->xfer_is_done = 1;
+	complete_all(&iproc_i2c->done);
+
+	return IRQ_HANDLED;
+}
+
+static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *iproc_i2c,
+				      struct i2c_msg *msg)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + M_CMD_OFFSET);
+	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
+
+	switch (val) {
+	case M_CMD_STATUS_SUCCESS:
+		return 0;
+
+	case M_CMD_STATUS_LOST_ARB:
+		dev_dbg(iproc_i2c->device, "lost bus arbitration\n");
+		return -EAGAIN;
+
+	case M_CMD_STATUS_NACK_ADDR:
+		dev_dbg(iproc_i2c->device, "NAK addr:0x%02x\n", msg->addr);
+		return -ENXIO;
+
+	case M_CMD_STATUS_NACK_DATA:
+		dev_dbg(iproc_i2c->device, "NAK data\n");
+		return -ENXIO;
+
+	case M_CMD_STATUS_TIMEOUT:
+		dev_dbg(iproc_i2c->device, "bus timeout\n");
+		return -ETIMEDOUT;
+
+	default:
+		dev_dbg(iproc_i2c->device, "unknown error code=%d\n", val);
+		return -EIO;
+	}
+}
+
+static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *iproc_i2c,
+					 struct i2c_msg *msg)
+{
+	int ret, i;
+	u8 addr;
+	u32 val;
+	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	/* need to reserve one byte in the FIFO for the slave address */
+	if (msg->len > M_TX_RX_FIFO_SIZE - 1) {
+		dev_err(iproc_i2c->device,
+			"only support data length up to %u bytes\n",
+			M_TX_RX_FIFO_SIZE - 1);
+		return -EOPNOTSUPP;
+	}
+
+	/* check if bus is busy */
+	if (!!(readl(iproc_i2c->base + M_CMD_OFFSET) &
+	       BIT(M_CMD_START_BUSY_SHIFT))) {
+		dev_warn(iproc_i2c->device, "bus is busy\n");
+		return -EBUSY;
+	}
+
+	/* format and load slave address into the TX FIFO */
+	addr = msg->addr << 1 | (msg->flags & I2C_M_RD ? 1 : 0);
+	writel(addr, iproc_i2c->base + M_TX_OFFSET);
+
+	/* for a write transaction, load data into the TX FIFO */
+	if (!(msg->flags & I2C_M_RD)) {
+		for (i = 0; i < msg->len; i++) {
+			val = msg->buf[i];
+
+			/* mark the last byte */
+			if (i == msg->len - 1)
+				val |= 1 << M_TX_WR_STATUS_SHIFT;
+
+			writel(val, iproc_i2c->base + M_TX_OFFSET);
+		}
+	}
+
+	/* mark as incomplete before starting the transaction */
+	reinit_completion(&iproc_i2c->done);
+	iproc_i2c->xfer_is_done = 0;
+
+	/*
+	 * Enable the "start busy" interrupt, which will be triggered after the
+	 * transaction is done, i.e., the internal start_busy bit, transitions
+	 * from 1 to 0.
+	 */
+	writel(1 << IE_M_START_BUSY_SHIFT, iproc_i2c->base + IE_OFFSET);
+
+	/*
+	 * Now we can activate the transfer. For a read operation, specify the
+	 * number of bytes to read
+	 */
+	val = 1 << M_CMD_START_BUSY_SHIFT;
+	if (msg->flags & I2C_M_RD) {
+		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
+		       (msg->len << M_CMD_RD_CNT_SHIFT);
+	} else {
+		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
+	}
+	writel(val, iproc_i2c->base + M_CMD_OFFSET);
+
+	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+	/* read it back to flush the write */
+	readl(iproc_i2c->base + IE_OFFSET);
+
+	/* make sure the interrupt handler isn't running */
+	synchronize_irq(iproc_i2c->irq);
+
+	if (!time_left && !iproc_i2c->xfer_is_done) {
+		dev_err(iproc_i2c->device, "transaction timed out\n");
+
+		/* flush FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return -ETIMEDOUT;
+	}
+
+	ret = bcm_iproc_i2c_check_status(iproc_i2c, msg);
+	if (ret) {
+		/* flush both TX/RX FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return ret;
+	}
+
+	/*
+	 * For a read operation, we now need to load the data from FIFO
+	 * into the memory buffer
+	 */
+	if (msg->flags & I2C_M_RD) {
+		for (i = 0; i < msg->len; i++) {
+			msg->buf[i] = (readl(iproc_i2c->base + M_RX_OFFSET) >>
+				      M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
+		}
+	}
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
+			      struct i2c_msg msgs[], int num)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = i2c_get_adapdata(adapter);
+	int ret, i;
+
+	/* go through all messages */
+	for (i = 0; i < num; i++) {
+		ret = bcm_iproc_i2c_xfer_single_msg(iproc_i2c, &msgs[i]);
+		if (ret) {
+			dev_dbg(iproc_i2c->device, "xfer failed\n");
+			return ret;
+		}
+	}
+
+	return num;
+}
+
+static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm bcm_iproc_algo = {
+	.master_xfer = bcm_iproc_i2c_xfer,
+	.functionality = bcm_iproc_i2c_functionality,
+};
+
+static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	unsigned int bus_speed;
+	u32 val;
+	int ret = of_property_read_u32(iproc_i2c->device->of_node,
+				       "clock-frequency", &bus_speed);
+	if (ret < 0) {
+		dev_info(iproc_i2c->device,
+			"unable to interpret clock-frequency DT property\n");
+		bus_speed = 100000;
+	}
+
+	if (bus_speed < 100000) {
+		dev_err(iproc_i2c->device, "%d Hz bus speed not supported\n",
+			bus_speed);
+		dev_err(iproc_i2c->device,
+			"valid speeds are 100khz and 400khz\n");
+		return -EINVAL;
+	} else if (bus_speed < 400000) {
+		bus_speed = 100000;
+	} else {
+		bus_speed = 400000;
+	}
+
+	val = readl(iproc_i2c->base + TIM_CFG_OFFSET);
+	val &= ~(1 << TIM_CFG_MODE_400_SHIFT);
+	val |= (bus_speed == 400000) << TIM_CFG_MODE_400_SHIFT;
+	writel(val, iproc_i2c->base + TIM_CFG_OFFSET);
+
+	dev_info(iproc_i2c->device, "bus set to %u Hz\n", bus_speed);
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	/* put controller in reset */
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val |= 1 << CFG_RESET_SHIFT;
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* wait 100 usec per spec */
+	udelay(100);
+
+	/* bring controller out of reset */
+	val &= ~(1 << CFG_RESET_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
+	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
+	writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+
+	/* clear all pending interrupts */
+	writel(0xffffffff, iproc_i2c->base + IS_OFFSET);
+
+	return 0;
+}
+
+static void bcm_iproc_i2c_enable_disable(struct bcm_iproc_i2c_dev *iproc_i2c,
+					 bool enable)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	if (enable)
+		val |= BIT(CFG_EN_SHIFT);
+	else
+		val &= ~BIT(CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+}
+
+static int bcm_iproc_i2c_probe(struct platform_device *pdev)
+{
+	int irq, ret = 0;
+	struct bcm_iproc_i2c_dev *iproc_i2c;
+	struct i2c_adapter *adap;
+	struct resource *res;
+
+	iproc_i2c = devm_kzalloc(&pdev->dev, sizeof(*iproc_i2c),
+				 GFP_KERNEL);
+	if (!iproc_i2c)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, iproc_i2c);
+	iproc_i2c->device = &pdev->dev;
+	init_completion(&iproc_i2c->done);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	iproc_i2c->base = devm_ioremap_resource(iproc_i2c->device, res);
+	if (IS_ERR(iproc_i2c->base))
+		return PTR_ERR(iproc_i2c->base);
+
+	ret = bcm_iproc_i2c_init(iproc_i2c);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_cfg_speed(iproc_i2c);
+	if (ret)
+		return ret;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq <= 0) {
+		dev_err(iproc_i2c->device, "no irq resource\n");
+		return irq;
+	}
+	iproc_i2c->irq = irq;
+
+	ret = devm_request_irq(iproc_i2c->device, irq, bcm_iproc_i2c_isr, 0,
+			       pdev->name, iproc_i2c);
+	if (ret < 0) {
+		dev_err(iproc_i2c->device, "unable to request irq %i\n", irq);
+		return ret;
+	}
+
+	bcm_iproc_i2c_enable_disable(iproc_i2c, true);
+
+	adap = &iproc_i2c->adapter;
+	i2c_set_adapdata(adap, iproc_i2c);
+	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
+	adap->algo = &bcm_iproc_algo;
+	adap->dev.parent = &pdev->dev;
+	adap->dev.of_node = pdev->dev.of_node;
+
+	ret = i2c_add_adapter(adap);
+	if (ret) {
+		dev_err(iproc_i2c->device, "failed to add adapter\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_remove(struct platform_device *pdev)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
+
+	/* make sure there's no pending interrupt when we remove the adapter */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+	readl(iproc_i2c->base + IE_OFFSET);
+	synchronize_irq(iproc_i2c->irq);
+
+	i2c_del_adapter(&iproc_i2c->adapter);
+	bcm_iproc_i2c_enable_disable(iproc_i2c, false);
+
+	return 0;
+}
+
+static const struct of_device_id bcm_iproc_i2c_of_match[] = {
+	{ .compatible = "brcm,iproc-i2c" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
+
+static struct platform_driver bcm_iproc_i2c_driver = {
+	.driver = {
+		.name = "bcm-iproc-i2c",
+		.of_match_table = bcm_iproc_i2c_of_match,
+	},
+	.probe = bcm_iproc_i2c_probe,
+	.remove = bcm_iproc_i2c_remove,
+};
+module_platform_driver(bcm_iproc_i2c_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>");
+MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v9 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

Add initial support to the Broadcom iProc I2C controller found in the
iProc family of SoCs.

The iProc I2C controller has separate internal TX and RX FIFOs, each has
a size of 64 bytes. The iProc I2C controller supports two bus speeds
including standard mode (100kHz) and fast mode (400kHz)

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Reviewed-by: Kevin Cernekee <cernekee@chromium.org>
---
 drivers/i2c/busses/Kconfig         |   10 +
 drivers/i2c/busses/Makefile        |    1 +
 drivers/i2c/busses/i2c-bcm-iproc.c |  461 ++++++++++++++++++++++++++++++++++++
 3 files changed, 472 insertions(+)
 create mode 100644 drivers/i2c/busses/i2c-bcm-iproc.c

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index ab838d9..3d08731 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -372,6 +372,16 @@ config I2C_BCM2835
 	  This support is also available as a module.  If so, the module
 	  will be called i2c-bcm2835.
 
+config I2C_BCM_IPROC
+	tristate "Broadcom iProc I2C controller"
+	depends on ARCH_BCM_IPROC || COMPILE_TEST
+	default ARCH_BCM_IPROC
+	help
+	  If you say yes to this option, support will be included for the
+	  Broadcom iProc I2C controller.
+
+	  If you don't know what to do here, say N.
+
 config I2C_BCM_KONA
 	tristate "BCM Kona I2C adapter"
 	depends on ARCH_BCM_MOBILE
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 56388f6..d93b509 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
 obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
 obj-$(CONFIG_I2C_AXXIA)		+= i2c-axxia.o
 obj-$(CONFIG_I2C_BCM2835)	+= i2c-bcm2835.o
+obj-$(CONFIG_I2C_BCM_IPROC)	+= i2c-bcm-iproc.o
 obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
 obj-$(CONFIG_I2C_CADENCE)	+= i2c-cadence.o
 obj-$(CONFIG_I2C_CBUS_GPIO)	+= i2c-cbus-gpio.o
diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
new file mode 100644
index 0000000..d3c8915
--- /dev/null
+++ b/drivers/i2c/busses/i2c-bcm-iproc.c
@@ -0,0 +1,461 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#define CFG_OFFSET                   0x00
+#define CFG_RESET_SHIFT              31
+#define CFG_EN_SHIFT                 30
+#define CFG_M_RETRY_CNT_SHIFT        16
+#define CFG_M_RETRY_CNT_MASK         0x0f
+
+#define TIM_CFG_OFFSET               0x04
+#define TIM_CFG_MODE_400_SHIFT       31
+
+#define M_FIFO_CTRL_OFFSET           0x0c
+#define M_FIFO_RX_FLUSH_SHIFT        31
+#define M_FIFO_TX_FLUSH_SHIFT        30
+#define M_FIFO_RX_CNT_SHIFT          16
+#define M_FIFO_RX_CNT_MASK           0x7f
+#define M_FIFO_RX_THLD_SHIFT         8
+#define M_FIFO_RX_THLD_MASK          0x3f
+
+#define M_CMD_OFFSET                 0x30
+#define M_CMD_START_BUSY_SHIFT       31
+#define M_CMD_STATUS_SHIFT           25
+#define M_CMD_STATUS_MASK            0x07
+#define M_CMD_STATUS_SUCCESS         0x0
+#define M_CMD_STATUS_LOST_ARB        0x1
+#define M_CMD_STATUS_NACK_ADDR       0x2
+#define M_CMD_STATUS_NACK_DATA       0x3
+#define M_CMD_STATUS_TIMEOUT         0x4
+#define M_CMD_PROTOCOL_SHIFT         9
+#define M_CMD_PROTOCOL_MASK          0xf
+#define M_CMD_PROTOCOL_BLK_WR        0x7
+#define M_CMD_PROTOCOL_BLK_RD        0x8
+#define M_CMD_PEC_SHIFT              8
+#define M_CMD_RD_CNT_SHIFT           0
+#define M_CMD_RD_CNT_MASK            0xff
+
+#define IE_OFFSET                    0x38
+#define IE_M_RX_FIFO_FULL_SHIFT      31
+#define IE_M_RX_THLD_SHIFT           30
+#define IE_M_START_BUSY_SHIFT        28
+
+#define IS_OFFSET                    0x3c
+#define IS_M_RX_FIFO_FULL_SHIFT      31
+#define IS_M_RX_THLD_SHIFT           30
+#define IS_M_START_BUSY_SHIFT        28
+
+#define M_TX_OFFSET                  0x40
+#define M_TX_WR_STATUS_SHIFT         31
+#define M_TX_DATA_SHIFT              0
+#define M_TX_DATA_MASK               0xff
+
+#define M_RX_OFFSET                  0x44
+#define M_RX_STATUS_SHIFT            30
+#define M_RX_STATUS_MASK             0x03
+#define M_RX_PEC_ERR_SHIFT           29
+#define M_RX_DATA_SHIFT              0
+#define M_RX_DATA_MASK               0xff
+
+#define I2C_TIMEOUT_MESC             100
+#define M_TX_RX_FIFO_SIZE            64
+
+enum bus_speed_index {
+	I2C_SPD_100K = 0,
+	I2C_SPD_400K,
+};
+
+struct bcm_iproc_i2c_dev {
+	struct device *device;
+	int irq;
+
+	void __iomem *base;
+
+	struct i2c_adapter adapter;
+
+	struct completion done;
+	int xfer_is_done;
+};
+
+/*
+ * Can be expanded in the future if more interrupt status bits are utilized
+ */
+#define ISR_MASK (1 << IS_M_START_BUSY_SHIFT)
+
+static irqreturn_t bcm_iproc_i2c_isr(int irq, void *data)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = data;
+	u32 status = readl(iproc_i2c->base + IS_OFFSET);
+
+	status &= ISR_MASK;
+
+	if (!status)
+		return IRQ_NONE;
+
+	writel(status, iproc_i2c->base + IS_OFFSET);
+	iproc_i2c->xfer_is_done = 1;
+	complete_all(&iproc_i2c->done);
+
+	return IRQ_HANDLED;
+}
+
+static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *iproc_i2c,
+				      struct i2c_msg *msg)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + M_CMD_OFFSET);
+	val = (val >> M_CMD_STATUS_SHIFT) & M_CMD_STATUS_MASK;
+
+	switch (val) {
+	case M_CMD_STATUS_SUCCESS:
+		return 0;
+
+	case M_CMD_STATUS_LOST_ARB:
+		dev_dbg(iproc_i2c->device, "lost bus arbitration\n");
+		return -EAGAIN;
+
+	case M_CMD_STATUS_NACK_ADDR:
+		dev_dbg(iproc_i2c->device, "NAK addr:0x%02x\n", msg->addr);
+		return -ENXIO;
+
+	case M_CMD_STATUS_NACK_DATA:
+		dev_dbg(iproc_i2c->device, "NAK data\n");
+		return -ENXIO;
+
+	case M_CMD_STATUS_TIMEOUT:
+		dev_dbg(iproc_i2c->device, "bus timeout\n");
+		return -ETIMEDOUT;
+
+	default:
+		dev_dbg(iproc_i2c->device, "unknown error code=%d\n", val);
+		return -EIO;
+	}
+}
+
+static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *iproc_i2c,
+					 struct i2c_msg *msg)
+{
+	int ret, i;
+	u8 addr;
+	u32 val;
+	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
+
+	/* need to reserve one byte in the FIFO for the slave address */
+	if (msg->len > M_TX_RX_FIFO_SIZE - 1) {
+		dev_err(iproc_i2c->device,
+			"only support data length up to %u bytes\n",
+			M_TX_RX_FIFO_SIZE - 1);
+		return -EOPNOTSUPP;
+	}
+
+	/* check if bus is busy */
+	if (!!(readl(iproc_i2c->base + M_CMD_OFFSET) &
+	       BIT(M_CMD_START_BUSY_SHIFT))) {
+		dev_warn(iproc_i2c->device, "bus is busy\n");
+		return -EBUSY;
+	}
+
+	/* format and load slave address into the TX FIFO */
+	addr = msg->addr << 1 | (msg->flags & I2C_M_RD ? 1 : 0);
+	writel(addr, iproc_i2c->base + M_TX_OFFSET);
+
+	/* for a write transaction, load data into the TX FIFO */
+	if (!(msg->flags & I2C_M_RD)) {
+		for (i = 0; i < msg->len; i++) {
+			val = msg->buf[i];
+
+			/* mark the last byte */
+			if (i == msg->len - 1)
+				val |= 1 << M_TX_WR_STATUS_SHIFT;
+
+			writel(val, iproc_i2c->base + M_TX_OFFSET);
+		}
+	}
+
+	/* mark as incomplete before starting the transaction */
+	reinit_completion(&iproc_i2c->done);
+	iproc_i2c->xfer_is_done = 0;
+
+	/*
+	 * Enable the "start busy" interrupt, which will be triggered after the
+	 * transaction is done, i.e., the internal start_busy bit, transitions
+	 * from 1 to 0.
+	 */
+	writel(1 << IE_M_START_BUSY_SHIFT, iproc_i2c->base + IE_OFFSET);
+
+	/*
+	 * Now we can activate the transfer. For a read operation, specify the
+	 * number of bytes to read
+	 */
+	val = 1 << M_CMD_START_BUSY_SHIFT;
+	if (msg->flags & I2C_M_RD) {
+		val |= (M_CMD_PROTOCOL_BLK_RD << M_CMD_PROTOCOL_SHIFT) |
+		       (msg->len << M_CMD_RD_CNT_SHIFT);
+	} else {
+		val |= (M_CMD_PROTOCOL_BLK_WR << M_CMD_PROTOCOL_SHIFT);
+	}
+	writel(val, iproc_i2c->base + M_CMD_OFFSET);
+
+	time_left = wait_for_completion_timeout(&iproc_i2c->done, time_left);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+	/* read it back to flush the write */
+	readl(iproc_i2c->base + IE_OFFSET);
+
+	/* make sure the interrupt handler isn't running */
+	synchronize_irq(iproc_i2c->irq);
+
+	if (!time_left && !iproc_i2c->xfer_is_done) {
+		dev_err(iproc_i2c->device, "transaction timed out\n");
+
+		/* flush FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return -ETIMEDOUT;
+	}
+
+	ret = bcm_iproc_i2c_check_status(iproc_i2c, msg);
+	if (ret) {
+		/* flush both TX/RX FIFOs */
+		val = (1 << M_FIFO_RX_FLUSH_SHIFT) |
+		      (1 << M_FIFO_TX_FLUSH_SHIFT);
+		writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+		return ret;
+	}
+
+	/*
+	 * For a read operation, we now need to load the data from FIFO
+	 * into the memory buffer
+	 */
+	if (msg->flags & I2C_M_RD) {
+		for (i = 0; i < msg->len; i++) {
+			msg->buf[i] = (readl(iproc_i2c->base + M_RX_OFFSET) >>
+				      M_RX_DATA_SHIFT) & M_RX_DATA_MASK;
+		}
+	}
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_xfer(struct i2c_adapter *adapter,
+			      struct i2c_msg msgs[], int num)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = i2c_get_adapdata(adapter);
+	int ret, i;
+
+	/* go through all messages */
+	for (i = 0; i < num; i++) {
+		ret = bcm_iproc_i2c_xfer_single_msg(iproc_i2c, &msgs[i]);
+		if (ret) {
+			dev_dbg(iproc_i2c->device, "xfer failed\n");
+			return ret;
+		}
+	}
+
+	return num;
+}
+
+static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm bcm_iproc_algo = {
+	.master_xfer = bcm_iproc_i2c_xfer,
+	.functionality = bcm_iproc_i2c_functionality,
+};
+
+static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	unsigned int bus_speed;
+	u32 val;
+	int ret = of_property_read_u32(iproc_i2c->device->of_node,
+				       "clock-frequency", &bus_speed);
+	if (ret < 0) {
+		dev_info(iproc_i2c->device,
+			"unable to interpret clock-frequency DT property\n");
+		bus_speed = 100000;
+	}
+
+	if (bus_speed < 100000) {
+		dev_err(iproc_i2c->device, "%d Hz bus speed not supported\n",
+			bus_speed);
+		dev_err(iproc_i2c->device,
+			"valid speeds are 100khz and 400khz\n");
+		return -EINVAL;
+	} else if (bus_speed < 400000) {
+		bus_speed = 100000;
+	} else {
+		bus_speed = 400000;
+	}
+
+	val = readl(iproc_i2c->base + TIM_CFG_OFFSET);
+	val &= ~(1 << TIM_CFG_MODE_400_SHIFT);
+	val |= (bus_speed == 400000) << TIM_CFG_MODE_400_SHIFT;
+	writel(val, iproc_i2c->base + TIM_CFG_OFFSET);
+
+	dev_info(iproc_i2c->device, "bus set to %u Hz\n", bus_speed);
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_init(struct bcm_iproc_i2c_dev *iproc_i2c)
+{
+	u32 val;
+
+	/* put controller in reset */
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	val |= 1 << CFG_RESET_SHIFT;
+	val &= ~(1 << CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* wait 100 usec per spec */
+	udelay(100);
+
+	/* bring controller out of reset */
+	val &= ~(1 << CFG_RESET_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+
+	/* flush TX/RX FIFOs and set RX FIFO threshold to zero */
+	val = (1 << M_FIFO_RX_FLUSH_SHIFT) | (1 << M_FIFO_TX_FLUSH_SHIFT);
+	writel(val, iproc_i2c->base + M_FIFO_CTRL_OFFSET);
+
+	/* disable all interrupts */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+
+	/* clear all pending interrupts */
+	writel(0xffffffff, iproc_i2c->base + IS_OFFSET);
+
+	return 0;
+}
+
+static void bcm_iproc_i2c_enable_disable(struct bcm_iproc_i2c_dev *iproc_i2c,
+					 bool enable)
+{
+	u32 val;
+
+	val = readl(iproc_i2c->base + CFG_OFFSET);
+	if (enable)
+		val |= BIT(CFG_EN_SHIFT);
+	else
+		val &= ~BIT(CFG_EN_SHIFT);
+	writel(val, iproc_i2c->base + CFG_OFFSET);
+}
+
+static int bcm_iproc_i2c_probe(struct platform_device *pdev)
+{
+	int irq, ret = 0;
+	struct bcm_iproc_i2c_dev *iproc_i2c;
+	struct i2c_adapter *adap;
+	struct resource *res;
+
+	iproc_i2c = devm_kzalloc(&pdev->dev, sizeof(*iproc_i2c),
+				 GFP_KERNEL);
+	if (!iproc_i2c)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, iproc_i2c);
+	iproc_i2c->device = &pdev->dev;
+	init_completion(&iproc_i2c->done);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	iproc_i2c->base = devm_ioremap_resource(iproc_i2c->device, res);
+	if (IS_ERR(iproc_i2c->base))
+		return PTR_ERR(iproc_i2c->base);
+
+	ret = bcm_iproc_i2c_init(iproc_i2c);
+	if (ret)
+		return ret;
+
+	ret = bcm_iproc_i2c_cfg_speed(iproc_i2c);
+	if (ret)
+		return ret;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq <= 0) {
+		dev_err(iproc_i2c->device, "no irq resource\n");
+		return irq;
+	}
+	iproc_i2c->irq = irq;
+
+	ret = devm_request_irq(iproc_i2c->device, irq, bcm_iproc_i2c_isr, 0,
+			       pdev->name, iproc_i2c);
+	if (ret < 0) {
+		dev_err(iproc_i2c->device, "unable to request irq %i\n", irq);
+		return ret;
+	}
+
+	bcm_iproc_i2c_enable_disable(iproc_i2c, true);
+
+	adap = &iproc_i2c->adapter;
+	i2c_set_adapdata(adap, iproc_i2c);
+	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
+	adap->algo = &bcm_iproc_algo;
+	adap->dev.parent = &pdev->dev;
+	adap->dev.of_node = pdev->dev.of_node;
+
+	ret = i2c_add_adapter(adap);
+	if (ret) {
+		dev_err(iproc_i2c->device, "failed to add adapter\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int bcm_iproc_i2c_remove(struct platform_device *pdev)
+{
+	struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
+
+	/* make sure there's no pending interrupt when we remove the adapter */
+	writel(0, iproc_i2c->base + IE_OFFSET);
+	readl(iproc_i2c->base + IE_OFFSET);
+	synchronize_irq(iproc_i2c->irq);
+
+	i2c_del_adapter(&iproc_i2c->adapter);
+	bcm_iproc_i2c_enable_disable(iproc_i2c, false);
+
+	return 0;
+}
+
+static const struct of_device_id bcm_iproc_i2c_of_match[] = {
+	{ .compatible = "brcm,iproc-i2c" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, bcm_iproc_i2c_of_match);
+
+static struct platform_driver bcm_iproc_i2c_driver = {
+	.driver = {
+		.name = "bcm-iproc-i2c",
+		.of_match_table = bcm_iproc_i2c_of_match,
+	},
+	.probe = bcm_iproc_i2c_probe,
+	.remove = bcm_iproc_i2c_remove,
+};
+module_platform_driver(bcm_iproc_i2c_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom iProc I2C Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.9.5

[PATCH v9 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
them disabled there. Individual I2C devices can be enabled in board
specific dts file when I2C slave devices are enabled in the future

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Reviewed-by: Kevin Cernekee <cernekee@chromium.org>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..ff5fb6a 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -70,6 +70,26 @@
 		};
 	};
 
+	i2c0: i2c@18008000 {
+		compatible = "brcm,cygnus-iproc-i2c", "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
+	i2c1: i2c@1800b000 {
+		compatible = "brcm,cygnus-iproc-i2c", "brcm,iproc-i2c";
+		reg = <0x1800b000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 86 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
 	uart0: serial@18020000 {
 		compatible = "snps,dw-apb-uart";
 		reg = <0x18020000 0x100>;
-- 
1.7.9.5

[PATCH v9 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
them disabled there. Individual I2C devices can be enabled in board
specific dts file when I2C slave devices are enabled in the future

Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
Reviewed-by: Kevin Cernekee <cernekee-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..ff5fb6a 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -70,6 +70,26 @@
 		};
 	};
 
+	i2c0: i2c@18008000 {
+		compatible = "brcm,cygnus-iproc-i2c", "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
+	i2c1: i2c@1800b000 {
+		compatible = "brcm,cygnus-iproc-i2c", "brcm,iproc-i2c";
+		reg = <0x1800b000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 86 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
 	uart0: serial@18020000 {
 		compatible = "snps,dw-apb-uart";
 		reg = <0x18020000 0x100>;
-- 
1.7.9.5

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[PATCH v9 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
them disabled there. Individual I2C devices can be enabled in board
specific dts file when I2C slave devices are enabled in the future

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Reviewed-by: Kevin Cernekee <cernekee@chromium.org>
---
 arch/arm/boot/dts/bcm-cygnus.dtsi |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
index 5126f9e..ff5fb6a 100644
--- a/arch/arm/boot/dts/bcm-cygnus.dtsi
+++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
@@ -70,6 +70,26 @@
 		};
 	};
 
+	i2c0: i2c at 18008000 {
+		compatible = "brcm,cygnus-iproc-i2c", "brcm,iproc-i2c";
+		reg = <0x18008000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
+	i2c1: i2c at 1800b000 {
+		compatible = "brcm,cygnus-iproc-i2c", "brcm,iproc-i2c";
+		reg = <0x1800b000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 86 IRQ_TYPE_NONE>;
+		clock-frequency = <100000>;
+		status = "disabled";
+	};
+
 	uart0: serial at 18020000 {
 		compatible = "snps,dw-apb-uart";
 		reg = <0x18020000 0x100>;
-- 
1.7.9.5

Re: [PATCH v8 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Wolfram Sang]

[-- Attachment #1: Type: text/plain, Size: 662 bytes --]


> > Is it really a HW limitation? Could the driver later be extended to
> > continue filling the FIFO if a certain threshold is reached?
> > 
> 
> Will return -EOPNOTSUPP. This really depends on whether or not we expect
> one sequence of START + SLV ADDR + DATA + STOP per i2c message. I can
> later extend the driver to refill/re-drain the FIFO for data size >= 64
> bytes, if one sequence of SATRT...STOP per message is not a requirement.

It is important to have the terminology clear here: One transfer can
consist of multiple messages. The transfer uses START/STOP at the
beginning/end, the messages within the transfer only REPEATED_START.


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[PATCH v8 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Wolfram Sang]

> > Is it really a HW limitation? Could the driver later be extended to
> > continue filling the FIFO if a certain threshold is reached?
> > 
> 
> Will return -EOPNOTSUPP. This really depends on whether or not we expect
> one sequence of START + SLV ADDR + DATA + STOP per i2c message. I can
> later extend the driver to refill/re-drain the FIFO for data size >= 64
> bytes, if one sequence of SATRT...STOP per message is not a requirement.

It is important to have the terminology clear here: One transfer can
consist of multiple messages. The transfer uses START/STOP at the
beginning/end, the messages within the transfer only REPEATED_START.

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Re: [PATCH v9 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Wolfram Sang]

[-- Attachment #1: Type: text/plain, Size: 637 bytes --]

On Sat, Feb 07, 2015 at 09:25:25PM -0800, Ray Jui wrote:
> Add initial support to the Broadcom iProc I2C controller found in the
> iProc family of SoCs.
> 
> The iProc I2C controller has separate internal TX and RX FIFOs, each has
> a size of 64 bytes. The iProc I2C controller supports two bus speeds
> including standard mode (100kHz) and fast mode (400kHz)
> 
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> Reviewed-by: Kevin Cernekee <cernekee@chromium.org>

Looks good. What kind of tests have you done with exactly this version of the
driver (not earlier ones)?


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Re: [PATCH v9 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Wolfram Sang]

[-- Attachment #1: Type: text/plain, Size: 718 bytes --]

On Sat, Feb 07, 2015 at 09:25:25PM -0800, Ray Jui wrote:
> Add initial support to the Broadcom iProc I2C controller found in the
> iProc family of SoCs.
> 
> The iProc I2C controller has separate internal TX and RX FIFOs, each has
> a size of 64 bytes. The iProc I2C controller supports two bus speeds
> including standard mode (100kHz) and fast mode (400kHz)
> 
> Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
> Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
> Reviewed-by: Kevin Cernekee <cernekee-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>

Looks good. What kind of tests have you done with exactly this version of the
driver (not earlier ones)?


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[PATCH v9 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Wolfram Sang]

On Sat, Feb 07, 2015 at 09:25:25PM -0800, Ray Jui wrote:
> Add initial support to the Broadcom iProc I2C controller found in the
> iProc family of SoCs.
> 
> The iProc I2C controller has separate internal TX and RX FIFOs, each has
> a size of 64 bytes. The iProc I2C controller supports two bus speeds
> including standard mode (100kHz) and fast mode (400kHz)
> 
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> Reviewed-by: Kevin Cernekee <cernekee@chromium.org>

Looks good. What kind of tests have you done with exactly this version of the
driver (not earlier ones)?

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Re: [PATCH v9 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 2/8/2015 8:29 AM, Wolfram Sang wrote:
> On Sat, Feb 07, 2015 at 09:25:25PM -0800, Ray Jui wrote:
>> Add initial support to the Broadcom iProc I2C controller found in the
>> iProc family of SoCs.
>>
>> The iProc I2C controller has separate internal TX and RX FIFOs, each has
>> a size of 64 bytes. The iProc I2C controller supports two bus speeds
>> including standard mode (100kHz) and fast mode (400kHz)
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>> Reviewed-by: Kevin Cernekee <cernekee@chromium.org>
> 
> Looks good. What kind of tests have you done with exactly this version of the
> driver (not earlier ones)?
> 
I did build test and ran i2cdetect on Cygnus BCM958300K combo board with
the 3.19 rc7 kernel, and then I back ported this driver to our 3.10
version of the production kernel (where we have complete audio driver
support), to run some audio playback tests, which involves using the
wolfson codec (through i2c). The only line I added when back porting to
the 3.10 kernel is of_i2c_register_devices at the end of probe.

Thanks,

Ray

Re: [PATCH v9 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 2/8/2015 8:29 AM, Wolfram Sang wrote:
> On Sat, Feb 07, 2015 at 09:25:25PM -0800, Ray Jui wrote:
>> Add initial support to the Broadcom iProc I2C controller found in the
>> iProc family of SoCs.
>>
>> The iProc I2C controller has separate internal TX and RX FIFOs, each has
>> a size of 64 bytes. The iProc I2C controller supports two bus speeds
>> including standard mode (100kHz) and fast mode (400kHz)
>>
>> Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>> Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>> Reviewed-by: Kevin Cernekee <cernekee-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
> 
> Looks good. What kind of tests have you done with exactly this version of the
> driver (not earlier ones)?
> 
I did build test and ran i2cdetect on Cygnus BCM958300K combo board with
the 3.19 rc7 kernel, and then I back ported this driver to our 3.10
version of the production kernel (where we have complete audio driver
support), to run some audio playback tests, which involves using the
wolfson codec (through i2c). The only line I added when back porting to
the 3.10 kernel is of_i2c_register_devices at the end of probe.

Thanks,

Ray

[PATCH v9 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 2/8/2015 8:29 AM, Wolfram Sang wrote:
> On Sat, Feb 07, 2015 at 09:25:25PM -0800, Ray Jui wrote:
>> Add initial support to the Broadcom iProc I2C controller found in the
>> iProc family of SoCs.
>>
>> The iProc I2C controller has separate internal TX and RX FIFOs, each has
>> a size of 64 bytes. The iProc I2C controller supports two bus speeds
>> including standard mode (100kHz) and fast mode (400kHz)
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>> Reviewed-by: Kevin Cernekee <cernekee@chromium.org>
> 
> Looks good. What kind of tests have you done with exactly this version of the
> driver (not earlier ones)?
> 
I did build test and ran i2cdetect on Cygnus BCM958300K combo board with
the 3.19 rc7 kernel, and then I back ported this driver to our 3.10
version of the production kernel (where we have complete audio driver
support), to run some audio playback tests, which involves using the
wolfson codec (through i2c). The only line I added when back porting to
the 3.10 kernel is of_i2c_register_devices at the end of probe.

Thanks,

Ray

Re: [PATCH v8 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 2/8/2015 3:03 AM, Wolfram Sang wrote:
> 
>>> Is it really a HW limitation? Could the driver later be extended to
>>> continue filling the FIFO if a certain threshold is reached?
>>>
>>
>> Will return -EOPNOTSUPP. This really depends on whether or not we expect
>> one sequence of START + SLV ADDR + DATA + STOP per i2c message. I can
>> later extend the driver to refill/re-drain the FIFO for data size >= 64
>> bytes, if one sequence of SATRT...STOP per message is not a requirement.
> 
> It is important to have the terminology clear here: One transfer can
> consist of multiple messages. The transfer uses START/STOP at the
> beginning/end, the messages within the transfer only REPEATED_START.
> 
Okay. Let me check with our ASIC engineer to see if there's a way to get
the driver extended to support the case when data size is larger than
the FIFO size. From my understanding based on the data sheet I have, I
don't think that can be done with this controller. But if the ASIC
engineers tells me the opposite, I'll add it as a separate patch later.

Thanks,

Ray

[PATCH v8 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 2/8/2015 3:03 AM, Wolfram Sang wrote:
> 
>>> Is it really a HW limitation? Could the driver later be extended to
>>> continue filling the FIFO if a certain threshold is reached?
>>>
>>
>> Will return -EOPNOTSUPP. This really depends on whether or not we expect
>> one sequence of START + SLV ADDR + DATA + STOP per i2c message. I can
>> later extend the driver to refill/re-drain the FIFO for data size >= 64
>> bytes, if one sequence of SATRT...STOP per message is not a requirement.
> 
> It is important to have the terminology clear here: One transfer can
> consist of multiple messages. The transfer uses START/STOP at the
> beginning/end, the messages within the transfer only REPEATED_START.
> 
Okay. Let me check with our ASIC engineer to see if there's a way to get
the driver extended to support the case when data size is larger than
the FIFO size. From my understanding based on the data sheet I have, I
don't think that can be done with this controller. But if the ASIC
engineers tells me the opposite, I'll add it as a separate patch later.

Thanks,

Ray

Re: [PATCH v8 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Wolfram Sang]

[-- Attachment #1: Type: text/plain, Size: 383 bytes --]


> Okay. Let me check with our ASIC engineer to see if there's a way to get
> the driver extended to support the case when data size is larger than
> the FIFO size. From my understanding based on the data sheet I have, I
> don't think that can be done with this controller. But if the ASIC
> engineers tells me the opposite, I'll add it as a separate patch later.

Perfect, thanks!


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Re: [PATCH v8 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Wolfram Sang]

[-- Attachment #1: Type: text/plain, Size: 383 bytes --]


> Okay. Let me check with our ASIC engineer to see if there's a way to get
> the driver extended to support the case when data size is larger than
> the FIFO size. From my understanding based on the data sheet I have, I
> don't think that can be done with this controller. But if the ASIC
> engineers tells me the opposite, I'll add it as a separate patch later.

Perfect, thanks!


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[PATCH v8 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Wolfram Sang]

> Okay. Let me check with our ASIC engineer to see if there's a way to get
> the driver extended to support the case when data size is larger than
> the FIFO size. From my understanding based on the data sheet I have, I
> don't think that can be done with this controller. But if the ASIC
> engineers tells me the opposite, I'll add it as a separate patch later.

Perfect, thanks!

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Re: [PATCH v9 1/3] i2c: iProc: define Broadcom iProc I2C binding

[Wolfram Sang]

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On Sat, Feb 07, 2015 at 09:25:24PM -0800, Ray Jui wrote:
> Document the I2C device tree binding for Broadcom iProc family of
> SoCs
> 
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> Reviewed-by: Kevin Cernekee <cernekee@chromium.org>

Applied to for-next, thanks!


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Re: [PATCH v9 1/3] i2c: iProc: define Broadcom iProc I2C binding

[Wolfram Sang]

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On Sat, Feb 07, 2015 at 09:25:24PM -0800, Ray Jui wrote:
> Document the I2C device tree binding for Broadcom iProc family of
> SoCs
> 
> Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
> Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
> Reviewed-by: Kevin Cernekee <cernekee-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>

Applied to for-next, thanks!


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[PATCH v9 1/3] i2c: iProc: define Broadcom iProc I2C binding

[Wolfram Sang]

On Sat, Feb 07, 2015 at 09:25:24PM -0800, Ray Jui wrote:
> Document the I2C device tree binding for Broadcom iProc family of
> SoCs
> 
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> Reviewed-by: Kevin Cernekee <cernekee@chromium.org>

Applied to for-next, thanks!

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Re: [PATCH v9 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Wolfram Sang]

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On Sat, Feb 07, 2015 at 09:25:25PM -0800, Ray Jui wrote:
> Add initial support to the Broadcom iProc I2C controller found in the
> iProc family of SoCs.
> 
> The iProc I2C controller has separate internal TX and RX FIFOs, each has
> a size of 64 bytes. The iProc I2C controller supports two bus speeds
> including standard mode (100kHz) and fast mode (400kHz)
> 
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> Reviewed-by: Kevin Cernekee <cernekee@chromium.org>

Applied to for-next, thanks!

Next time, please send new patches as seperate threads, not as a reply
to the old series.


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Re: [PATCH v9 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Wolfram Sang]

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On Sat, Feb 07, 2015 at 09:25:25PM -0800, Ray Jui wrote:
> Add initial support to the Broadcom iProc I2C controller found in the
> iProc family of SoCs.
> 
> The iProc I2C controller has separate internal TX and RX FIFOs, each has
> a size of 64 bytes. The iProc I2C controller supports two bus speeds
> including standard mode (100kHz) and fast mode (400kHz)
> 
> Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
> Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
> Reviewed-by: Kevin Cernekee <cernekee-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>

Applied to for-next, thanks!

Next time, please send new patches as seperate threads, not as a reply
to the old series.


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[PATCH v9 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Wolfram Sang]

On Sat, Feb 07, 2015 at 09:25:25PM -0800, Ray Jui wrote:
> Add initial support to the Broadcom iProc I2C controller found in the
> iProc family of SoCs.
> 
> The iProc I2C controller has separate internal TX and RX FIFOs, each has
> a size of 64 bytes. The iProc I2C controller supports two bus speeds
> including standard mode (100kHz) and fast mode (400kHz)
> 
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> Reviewed-by: Kevin Cernekee <cernekee@chromium.org>

Applied to for-next, thanks!

Next time, please send new patches as seperate threads, not as a reply
to the old series.

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Re: [PATCH v9 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Wolfram Sang]

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On Sat, Feb 07, 2015 at 09:25:26PM -0800, Ray Jui wrote:
> Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
> them disabled there. Individual I2C devices can be enabled in board
> specific dts file when I2C slave devices are enabled in the future
> 
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> Reviewed-by: Kevin Cernekee <cernekee@chromium.org>

I usually don't take DTS patches. They should go via arm-soc. Please say
so if there are reasons I should take them.


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[PATCH v9 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Wolfram Sang]

On Sat, Feb 07, 2015 at 09:25:26PM -0800, Ray Jui wrote:
> Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
> them disabled there. Individual I2C devices can be enabled in board
> specific dts file when I2C slave devices are enabled in the future
> 
> Signed-off-by: Ray Jui <rjui@broadcom.com>
> Reviewed-by: Scott Branden <sbranden@broadcom.com>
> Reviewed-by: Kevin Cernekee <cernekee@chromium.org>

I usually don't take DTS patches. They should go via arm-soc. Please say
so if there are reasons I should take them.

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Re: [PATCH v8 2/4] pinctrl: cygnus: add gpio/pinconf driver

[Dmitry Torokhov]

Hi Ray,

On Wed, Feb 04, 2015 at 09:21:01AM -0800, Ray Jui wrote:
> +static int cygnus_gpio_pinmux_add_range(struct cygnus_gpio *chip)
> +{
> +	struct device_node *node = chip->dev->of_node;
> +	struct device_node *pinmux_node;
> +	struct platform_device *pinmux_pdev;
> +	struct gpio_chip *gc = &chip->gc;
> +	int i, ret;
> +
> +	/* parse DT to find the phandle to the pinmux controller */
> +	pinmux_node = of_parse_phandle(node, "pinmux", 0);
> +	if (!pinmux_node)
> +		return -ENODEV;
> +
> +	pinmux_pdev = of_find_device_by_node(pinmux_node);
> +	if (!pinmux_pdev) {
> +		dev_err(chip->dev, "failed to get pinmux device\n");
> +		return -EINVAL;
> +	}
> +
> +	/* now need to create the mapping between local GPIO and PINMUX pins */
> +	for (i = 0; i < ARRAY_SIZE(cygnus_gpio_pintable); i++) {
> +		ret = gpiochip_add_pin_range(gc, dev_name(&pinmux_pdev->dev),
> +					     cygnus_gpio_pintable[i].offset,
> +					     cygnus_gpio_pintable[i].pin_base,
> +					     cygnus_gpio_pintable[i].num_pins);
> +		if (ret) {
> +			dev_err(chip->dev, "unable to add GPIO pin range\n");
> +			goto err_put_device;
> +		}
> +	}
> +
> +	chip->pinmux_is_supported = true;
> +
> +	/* no need for pinmux_pdev device reference anymore */
> +	put_device(&pinmux_pdev->dev);

Sorry I did not notice it before, but of_parse_phandle() takes reference
to the returned device node, so you need to "put" it here and in error
path as well. Actually you can do:

	int ret = 0;

	pinmux_node = of_parse_phandle(node, "pinmux", 0);
	if (!pinmux_node)
		return -ENODEV;

	pinmux_pdev = of_find_device_by_node(pinmux_node);
	/* We do not longer need pinmux node */
	of_node_put(pinmux_node);

	if (!pinmux_dev)
		....

	for (..) {
		...
		if (ret) {
			dev_err(...);
			break;
		}
	}

	chip->pinmux_is_supported = (ret == 0);
	put_device(..);
	return ret;
}

This way you free resources in the same path.

...

> +
> +static struct platform_driver cygnus_gpio_driver = {
> +	.driver = {
> +		.name = "cygnus-gpio",
> +		.of_match_table = cygnus_gpio_of_match,
> +		.suppress_bind_attrs = true,
> +	},
> +	.probe = cygnus_gpio_probe,
> +};
> +
> +static int __init cygnus_gpio_init(void)
> +{
> +	return platform_driver_probe(&cygnus_gpio_driver, cygnus_gpio_probe);

When I asked you to add ".suppress_bind_attrs = true" I missed the fact
that you were using platform_driver_probe() which already does this
internally. However platform_driver_probe() can't handle deferred
probing, which may or may not be OK. Is there a chance that any of the
resources needed by the driver return -EPROBE_DEFER? If not then it is
safe to continue using platform_driver_probe() and you can drop
suppress_bind_attrs assignment, otherwise it may be better to switch to
platform_driver_register().

Thanks.

-- 
Dmitry

[PATCH v8 2/4] pinctrl: cygnus: add gpio/pinconf driver

[Dmitry Torokhov]

Hi Ray,

On Wed, Feb 04, 2015 at 09:21:01AM -0800, Ray Jui wrote:
> +static int cygnus_gpio_pinmux_add_range(struct cygnus_gpio *chip)
> +{
> +	struct device_node *node = chip->dev->of_node;
> +	struct device_node *pinmux_node;
> +	struct platform_device *pinmux_pdev;
> +	struct gpio_chip *gc = &chip->gc;
> +	int i, ret;
> +
> +	/* parse DT to find the phandle to the pinmux controller */
> +	pinmux_node = of_parse_phandle(node, "pinmux", 0);
> +	if (!pinmux_node)
> +		return -ENODEV;
> +
> +	pinmux_pdev = of_find_device_by_node(pinmux_node);
> +	if (!pinmux_pdev) {
> +		dev_err(chip->dev, "failed to get pinmux device\n");
> +		return -EINVAL;
> +	}
> +
> +	/* now need to create the mapping between local GPIO and PINMUX pins */
> +	for (i = 0; i < ARRAY_SIZE(cygnus_gpio_pintable); i++) {
> +		ret = gpiochip_add_pin_range(gc, dev_name(&pinmux_pdev->dev),
> +					     cygnus_gpio_pintable[i].offset,
> +					     cygnus_gpio_pintable[i].pin_base,
> +					     cygnus_gpio_pintable[i].num_pins);
> +		if (ret) {
> +			dev_err(chip->dev, "unable to add GPIO pin range\n");
> +			goto err_put_device;
> +		}
> +	}
> +
> +	chip->pinmux_is_supported = true;
> +
> +	/* no need for pinmux_pdev device reference anymore */
> +	put_device(&pinmux_pdev->dev);

Sorry I did not notice it before, but of_parse_phandle() takes reference
to the returned device node, so you need to "put" it here and in error
path as well. Actually you can do:

	int ret = 0;

	pinmux_node = of_parse_phandle(node, "pinmux", 0);
	if (!pinmux_node)
		return -ENODEV;

	pinmux_pdev = of_find_device_by_node(pinmux_node);
	/* We do not longer need pinmux node */
	of_node_put(pinmux_node);

	if (!pinmux_dev)
		....

	for (..) {
		...
		if (ret) {
			dev_err(...);
			break;
		}
	}

	chip->pinmux_is_supported = (ret == 0);
	put_device(..);
	return ret;
}

This way you free resources in the same path.

...

> +
> +static struct platform_driver cygnus_gpio_driver = {
> +	.driver = {
> +		.name = "cygnus-gpio",
> +		.of_match_table = cygnus_gpio_of_match,
> +		.suppress_bind_attrs = true,
> +	},
> +	.probe = cygnus_gpio_probe,
> +};
> +
> +static int __init cygnus_gpio_init(void)
> +{
> +	return platform_driver_probe(&cygnus_gpio_driver, cygnus_gpio_probe);

When I asked you to add ".suppress_bind_attrs = true" I missed the fact
that you were using platform_driver_probe() which already does this
internally. However platform_driver_probe() can't handle deferred
probing, which may or may not be OK. Is there a chance that any of the
resources needed by the driver return -EPROBE_DEFER? If not then it is
safe to continue using platform_driver_probe() and you can drop
suppress_bind_attrs assignment, otherwise it may be better to switch to
platform_driver_register().

Thanks.

-- 
Dmitry

Re: [PATCH v9 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 2/9/2015 4:10 AM, Wolfram Sang wrote:
> On Sat, Feb 07, 2015 at 09:25:25PM -0800, Ray Jui wrote:
>> Add initial support to the Broadcom iProc I2C controller found in the
>> iProc family of SoCs.
>>
>> The iProc I2C controller has separate internal TX and RX FIFOs, each has
>> a size of 64 bytes. The iProc I2C controller supports two bus speeds
>> including standard mode (100kHz) and fast mode (400kHz)
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>> Reviewed-by: Kevin Cernekee <cernekee@chromium.org>
> 
> Applied to for-next, thanks!
> 
> Next time, please send new patches as seperate threads, not as a reply
> to the old series.
> 

Thanks, Wolfram. I think I'm missing something here and would like to
get it clarified, so I don't make the same mistake again in the future:
I thought I've already sent these patches as a new thread, i.e., [PATCH
v9 ...], isn't it?

Thanks,

Ray

Re: [PATCH v9 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 2/9/2015 4:10 AM, Wolfram Sang wrote:
> On Sat, Feb 07, 2015 at 09:25:25PM -0800, Ray Jui wrote:
>> Add initial support to the Broadcom iProc I2C controller found in the
>> iProc family of SoCs.
>>
>> The iProc I2C controller has separate internal TX and RX FIFOs, each has
>> a size of 64 bytes. The iProc I2C controller supports two bus speeds
>> including standard mode (100kHz) and fast mode (400kHz)
>>
>> Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>> Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>> Reviewed-by: Kevin Cernekee <cernekee-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
> 
> Applied to for-next, thanks!
> 
> Next time, please send new patches as seperate threads, not as a reply
> to the old series.
> 

Thanks, Wolfram. I think I'm missing something here and would like to
get it clarified, so I don't make the same mistake again in the future:
I thought I've already sent these patches as a new thread, i.e., [PATCH
v9 ...], isn't it?

Thanks,

Ray

[PATCH v9 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 2/9/2015 4:10 AM, Wolfram Sang wrote:
> On Sat, Feb 07, 2015 at 09:25:25PM -0800, Ray Jui wrote:
>> Add initial support to the Broadcom iProc I2C controller found in the
>> iProc family of SoCs.
>>
>> The iProc I2C controller has separate internal TX and RX FIFOs, each has
>> a size of 64 bytes. The iProc I2C controller supports two bus speeds
>> including standard mode (100kHz) and fast mode (400kHz)
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>> Reviewed-by: Kevin Cernekee <cernekee@chromium.org>
> 
> Applied to for-next, thanks!
> 
> Next time, please send new patches as seperate threads, not as a reply
> to the old series.
> 

Thanks, Wolfram. I think I'm missing something here and would like to
get it clarified, so I don't make the same mistake again in the future:
I thought I've already sent these patches as a new thread, i.e., [PATCH
v9 ...], isn't it?

Thanks,

Ray

Re: [PATCH v9 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

On 2/9/2015 4:11 AM, Wolfram Sang wrote:
> On Sat, Feb 07, 2015 at 09:25:26PM -0800, Ray Jui wrote:
>> Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
>> them disabled there. Individual I2C devices can be enabled in board
>> specific dts file when I2C slave devices are enabled in the future
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>> Reviewed-by: Kevin Cernekee <cernekee@chromium.org>
> 
> I usually don't take DTS patches. They should go via arm-soc. Please say
> so if there are reasons I should take them.
> 
Okay. I'll send this as an individual patch to arm-soc.

Thanks,

Ray

Re: [PATCH v9 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

On 2/9/2015 4:11 AM, Wolfram Sang wrote:
> On Sat, Feb 07, 2015 at 09:25:26PM -0800, Ray Jui wrote:
>> Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
>> them disabled there. Individual I2C devices can be enabled in board
>> specific dts file when I2C slave devices are enabled in the future
>>
>> Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>> Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>> Reviewed-by: Kevin Cernekee <cernekee-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
> 
> I usually don't take DTS patches. They should go via arm-soc. Please say
> so if there are reasons I should take them.
> 
Okay. I'll send this as an individual patch to arm-soc.

Thanks,

Ray
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[PATCH v9 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

On 2/9/2015 4:11 AM, Wolfram Sang wrote:
> On Sat, Feb 07, 2015 at 09:25:26PM -0800, Ray Jui wrote:
>> Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
>> them disabled there. Individual I2C devices can be enabled in board
>> specific dts file when I2C slave devices are enabled in the future
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>> Reviewed-by: Kevin Cernekee <cernekee@chromium.org>
> 
> I usually don't take DTS patches. They should go via arm-soc. Please say
> so if there are reasons I should take them.
> 
Okay. I'll send this as an individual patch to arm-soc.

Thanks,

Ray

Re: [PATCH v9 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Florian Fainelli]

Le 09/02/2015 21:24, Ray Jui a écrit :
> 
> 
> On 2/9/2015 4:11 AM, Wolfram Sang wrote:
>> On Sat, Feb 07, 2015 at 09:25:26PM -0800, Ray Jui wrote:
>>> Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
>>> them disabled there. Individual I2C devices can be enabled in board
>>> specific dts file when I2C slave devices are enabled in the future
>>>
>>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>>> Reviewed-by: Kevin Cernekee <cernekee@chromium.org>
>>
>> I usually don't take DTS patches. They should go via arm-soc. Please say
>> so if there are reasons I should take them.
>>
> Okay. I'll send this as an individual patch to arm-soc.

Could you put in  in a branch somewhere on github.comù/cygnus-linus.git
so it's easy for me to pull from there?
--
Florian

Re: [PATCH v9 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Florian Fainelli]

Le 09/02/2015 21:24, Ray Jui a écrit :
> 
> 
> On 2/9/2015 4:11 AM, Wolfram Sang wrote:
>> On Sat, Feb 07, 2015 at 09:25:26PM -0800, Ray Jui wrote:
>>> Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
>>> them disabled there. Individual I2C devices can be enabled in board
>>> specific dts file when I2C slave devices are enabled in the future
>>>
>>> Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>>> Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>>> Reviewed-by: Kevin Cernekee <cernekee-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
>>
>> I usually don't take DTS patches. They should go via arm-soc. Please say
>> so if there are reasons I should take them.
>>
> Okay. I'll send this as an individual patch to arm-soc.

Could you put in  in a branch somewhere on github.comù/cygnus-linus.git
so it's easy for me to pull from there?
--
Florian
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[PATCH v9 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Florian Fainelli]

Le 09/02/2015 21:24, Ray Jui a ?crit :
> 
> 
> On 2/9/2015 4:11 AM, Wolfram Sang wrote:
>> On Sat, Feb 07, 2015 at 09:25:26PM -0800, Ray Jui wrote:
>>> Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
>>> them disabled there. Individual I2C devices can be enabled in board
>>> specific dts file when I2C slave devices are enabled in the future
>>>
>>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>>> Reviewed-by: Kevin Cernekee <cernekee@chromium.org>
>>
>> I usually don't take DTS patches. They should go via arm-soc. Please say
>> so if there are reasons I should take them.
>>
> Okay. I'll send this as an individual patch to arm-soc.

Could you put in  in a branch somewhere on github.com?/cygnus-linus.git
so it's easy for me to pull from there?
--
Florian

Re: [PATCH v9 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

On 2/9/2015 9:34 PM, Florian Fainelli wrote:
> Le 09/02/2015 21:24, Ray Jui a écrit :
>>
>>
>> On 2/9/2015 4:11 AM, Wolfram Sang wrote:
>>> On Sat, Feb 07, 2015 at 09:25:26PM -0800, Ray Jui wrote:
>>>> Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
>>>> them disabled there. Individual I2C devices can be enabled in board
>>>> specific dts file when I2C slave devices are enabled in the future
>>>>
>>>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>>>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>>>> Reviewed-by: Kevin Cernekee <cernekee@chromium.org>
>>>
>>> I usually don't take DTS patches. They should go via arm-soc. Please say
>>> so if there are reasons I should take them.
>>>
>> Okay. I'll send this as an individual patch to arm-soc.
> 
> Could you put in  in a branch somewhere on github.comù/cygnus-linus.git
> so it's easy for me to pull from there?
> --
> Florian
> 
Hi Florian,

It's in branch cygnus-i2c-v9.

Thanks!

Ray

Re: [PATCH v9 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

On 2/9/2015 9:34 PM, Florian Fainelli wrote:
> Le 09/02/2015 21:24, Ray Jui a écrit :
>>
>>
>> On 2/9/2015 4:11 AM, Wolfram Sang wrote:
>>> On Sat, Feb 07, 2015 at 09:25:26PM -0800, Ray Jui wrote:
>>>> Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
>>>> them disabled there. Individual I2C devices can be enabled in board
>>>> specific dts file when I2C slave devices are enabled in the future
>>>>
>>>> Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>>>> Reviewed-by: Scott Branden <sbranden-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
>>>> Reviewed-by: Kevin Cernekee <cernekee-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
>>>
>>> I usually don't take DTS patches. They should go via arm-soc. Please say
>>> so if there are reasons I should take them.
>>>
>> Okay. I'll send this as an individual patch to arm-soc.
> 
> Could you put in  in a branch somewhere on github.comù/cygnus-linus.git
> so it's easy for me to pull from there?
> --
> Florian
> 
Hi Florian,

It's in branch cygnus-i2c-v9.

Thanks!

Ray

[PATCH v9 3/3] ARM: dts: add I2C device nodes for Broadcom Cygnus

[Ray Jui]

On 2/9/2015 9:34 PM, Florian Fainelli wrote:
> Le 09/02/2015 21:24, Ray Jui a ?crit :
>>
>>
>> On 2/9/2015 4:11 AM, Wolfram Sang wrote:
>>> On Sat, Feb 07, 2015 at 09:25:26PM -0800, Ray Jui wrote:
>>>> Add I2C device nodes and its properties in bcm-cygnus.dtsi but keep
>>>> them disabled there. Individual I2C devices can be enabled in board
>>>> specific dts file when I2C slave devices are enabled in the future
>>>>
>>>> Signed-off-by: Ray Jui <rjui@broadcom.com>
>>>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>>>> Reviewed-by: Kevin Cernekee <cernekee@chromium.org>
>>>
>>> I usually don't take DTS patches. They should go via arm-soc. Please say
>>> so if there are reasons I should take them.
>>>
>> Okay. I'll send this as an individual patch to arm-soc.
> 
> Could you put in  in a branch somewhere on github.com?/cygnus-linus.git
> so it's easy for me to pull from there?
> --
> Florian
> 
Hi Florian,

It's in branch cygnus-i2c-v9.

Thanks!

Ray

Re: [PATCH v9 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Wolfram Sang]

[-- Attachment #1: Type: text/plain, Size: 406 bytes --]


> Thanks, Wolfram. I think I'm missing something here and would like to
> get it clarified, so I don't make the same mistake again in the future:
> I thought I've already sent these patches as a new thread, i.e., [PATCH
> v9 ...], isn't it?

Yes, but "In-Reply-To" was set and so my MUAs (mutt and Thunderbird)
threaded them to your first submission. Most people I know prefer to
have this not threaded.


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Re: [PATCH v9 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Wolfram Sang]

[-- Attachment #1: Type: text/plain, Size: 406 bytes --]


> Thanks, Wolfram. I think I'm missing something here and would like to
> get it clarified, so I don't make the same mistake again in the future:
> I thought I've already sent these patches as a new thread, i.e., [PATCH
> v9 ...], isn't it?

Yes, but "In-Reply-To" was set and so my MUAs (mutt and Thunderbird)
threaded them to your first submission. Most people I know prefer to
have this not threaded.


[-- Attachment #2: Digital signature --]
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[PATCH v9 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Wolfram Sang]

> Thanks, Wolfram. I think I'm missing something here and would like to
> get it clarified, so I don't make the same mistake again in the future:
> I thought I've already sent these patches as a new thread, i.e., [PATCH
> v9 ...], isn't it?

Yes, but "In-Reply-To" was set and so my MUAs (mutt and Thunderbird)
threaded them to your first submission. Most people I know prefer to
have this not threaded.

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Re: [PATCH v9 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 2/10/2015 12:33 AM, Wolfram Sang wrote:
> 
>> Thanks, Wolfram. I think I'm missing something here and would like to
>> get it clarified, so I don't make the same mistake again in the future:
>> I thought I've already sent these patches as a new thread, i.e., [PATCH
>> v9 ...], isn't it?
> 
> Yes, but "In-Reply-To" was set and so my MUAs (mutt and Thunderbird)
> threaded them to your first submission. Most people I know prefer to
> have this not threaded.
> 
Okay I got it now. Thanks.

Ray

Re: [PATCH v9 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 2/10/2015 12:33 AM, Wolfram Sang wrote:
> 
>> Thanks, Wolfram. I think I'm missing something here and would like to
>> get it clarified, so I don't make the same mistake again in the future:
>> I thought I've already sent these patches as a new thread, i.e., [PATCH
>> v9 ...], isn't it?
> 
> Yes, but "In-Reply-To" was set and so my MUAs (mutt and Thunderbird)
> threaded them to your first submission. Most people I know prefer to
> have this not threaded.
> 
Okay I got it now. Thanks.

Ray

[PATCH v9 2/3] i2c: iproc: Add Broadcom iProc I2C Driver

[Ray Jui]

On 2/10/2015 12:33 AM, Wolfram Sang wrote:
> 
>> Thanks, Wolfram. I think I'm missing something here and would like to
>> get it clarified, so I don't make the same mistake again in the future:
>> I thought I've already sent these patches as a new thread, i.e., [PATCH
>> v9 ...], isn't it?
> 
> Yes, but "In-Reply-To" was set and so my MUAs (mutt and Thunderbird)
> threaded them to your first submission. Most people I know prefer to
> have this not threaded.
> 
Okay I got it now. Thanks.

Ray

Re: [PATCH v8 2/4] pinctrl: cygnus: add gpio/pinconf driver

[Ray Jui]

On 2/9/2015 11:20 AM, Dmitry Torokhov wrote:
> Hi Ray,
> 
> On Wed, Feb 04, 2015 at 09:21:01AM -0800, Ray Jui wrote:
>> +static int cygnus_gpio_pinmux_add_range(struct cygnus_gpio *chip)
>> +{
>> +	struct device_node *node = chip->dev->of_node;
>> +	struct device_node *pinmux_node;
>> +	struct platform_device *pinmux_pdev;
>> +	struct gpio_chip *gc = &chip->gc;
>> +	int i, ret;
>> +
>> +	/* parse DT to find the phandle to the pinmux controller */
>> +	pinmux_node = of_parse_phandle(node, "pinmux", 0);
>> +	if (!pinmux_node)
>> +		return -ENODEV;
>> +
>> +	pinmux_pdev = of_find_device_by_node(pinmux_node);
>> +	if (!pinmux_pdev) {
>> +		dev_err(chip->dev, "failed to get pinmux device\n");
>> +		return -EINVAL;
>> +	}
>> +
>> +	/* now need to create the mapping between local GPIO and PINMUX pins */
>> +	for (i = 0; i < ARRAY_SIZE(cygnus_gpio_pintable); i++) {
>> +		ret = gpiochip_add_pin_range(gc, dev_name(&pinmux_pdev->dev),
>> +					     cygnus_gpio_pintable[i].offset,
>> +					     cygnus_gpio_pintable[i].pin_base,
>> +					     cygnus_gpio_pintable[i].num_pins);
>> +		if (ret) {
>> +			dev_err(chip->dev, "unable to add GPIO pin range\n");
>> +			goto err_put_device;
>> +		}
>> +	}
>> +
>> +	chip->pinmux_is_supported = true;
>> +
>> +	/* no need for pinmux_pdev device reference anymore */
>> +	put_device(&pinmux_pdev->dev);
> 
> Sorry I did not notice it before, but of_parse_phandle() takes reference
> to the returned device node, so you need to "put" it here and in error
> path as well. Actually you can do:
> 
> 	int ret = 0;
> 
> 	pinmux_node = of_parse_phandle(node, "pinmux", 0);
> 	if (!pinmux_node)
> 		return -ENODEV;
> 
> 	pinmux_pdev = of_find_device_by_node(pinmux_node);
> 	/* We do not longer need pinmux node */
> 	of_node_put(pinmux_node);
> 
> 	if (!pinmux_dev)
> 		....
> 
> 	for (..) {
> 		...
> 		if (ret) {
> 			dev_err(...);
> 			break;
> 		}
> 	}
> 
> 	chip->pinmux_is_supported = (ret == 0);
> 	put_device(..);
> 	return ret;
> }
> 
> This way you free resources in the same path.
> 

Thanks. I'll make the change.

> ...
> 
>> +
>> +static struct platform_driver cygnus_gpio_driver = {
>> +	.driver = {
>> +		.name = "cygnus-gpio",
>> +		.of_match_table = cygnus_gpio_of_match,
>> +		.suppress_bind_attrs = true,
>> +	},
>> +	.probe = cygnus_gpio_probe,
>> +};
>> +
>> +static int __init cygnus_gpio_init(void)
>> +{
>> +	return platform_driver_probe(&cygnus_gpio_driver, cygnus_gpio_probe);
> 
> When I asked you to add ".suppress_bind_attrs = true" I missed the fact
> that you were using platform_driver_probe() which already does this
> internally. However platform_driver_probe() can't handle deferred
> probing, which may or may not be OK. Is there a chance that any of the
> resources needed by the driver return -EPROBE_DEFER? If not then it is
> safe to continue using platform_driver_probe() and you can drop
> suppress_bind_attrs assignment, otherwise it may be better to switch to
> platform_driver_register().
> 
> Thanks.
> 

No I do not expect any resource that this driver depends on to return
-EPROBE_DEFER. The IOMUX driver that this driver depends on should be
initialized before this driver.

I'll drop .suppress_bind_attrs then. Thanks.

Ray

Re: [PATCH v8 2/4] pinctrl: cygnus: add gpio/pinconf driver

[Ray Jui]

On 2/9/2015 11:20 AM, Dmitry Torokhov wrote:
> Hi Ray,
> 
> On Wed, Feb 04, 2015 at 09:21:01AM -0800, Ray Jui wrote:
>> +static int cygnus_gpio_pinmux_add_range(struct cygnus_gpio *chip)
>> +{
>> +	struct device_node *node = chip->dev->of_node;
>> +	struct device_node *pinmux_node;
>> +	struct platform_device *pinmux_pdev;
>> +	struct gpio_chip *gc = &chip->gc;
>> +	int i, ret;
>> +
>> +	/* parse DT to find the phandle to the pinmux controller */
>> +	pinmux_node = of_parse_phandle(node, "pinmux", 0);
>> +	if (!pinmux_node)
>> +		return -ENODEV;
>> +
>> +	pinmux_pdev = of_find_device_by_node(pinmux_node);
>> +	if (!pinmux_pdev) {
>> +		dev_err(chip->dev, "failed to get pinmux device\n");
>> +		return -EINVAL;
>> +	}
>> +
>> +	/* now need to create the mapping between local GPIO and PINMUX pins */
>> +	for (i = 0; i < ARRAY_SIZE(cygnus_gpio_pintable); i++) {
>> +		ret = gpiochip_add_pin_range(gc, dev_name(&pinmux_pdev->dev),
>> +					     cygnus_gpio_pintable[i].offset,
>> +					     cygnus_gpio_pintable[i].pin_base,
>> +					     cygnus_gpio_pintable[i].num_pins);
>> +		if (ret) {
>> +			dev_err(chip->dev, "unable to add GPIO pin range\n");
>> +			goto err_put_device;
>> +		}
>> +	}
>> +
>> +	chip->pinmux_is_supported = true;
>> +
>> +	/* no need for pinmux_pdev device reference anymore */
>> +	put_device(&pinmux_pdev->dev);
> 
> Sorry I did not notice it before, but of_parse_phandle() takes reference
> to the returned device node, so you need to "put" it here and in error
> path as well. Actually you can do:
> 
> 	int ret = 0;
> 
> 	pinmux_node = of_parse_phandle(node, "pinmux", 0);
> 	if (!pinmux_node)
> 		return -ENODEV;
> 
> 	pinmux_pdev = of_find_device_by_node(pinmux_node);
> 	/* We do not longer need pinmux node */
> 	of_node_put(pinmux_node);
> 
> 	if (!pinmux_dev)
> 		....
> 
> 	for (..) {
> 		...
> 		if (ret) {
> 			dev_err(...);
> 			break;
> 		}
> 	}
> 
> 	chip->pinmux_is_supported = (ret == 0);
> 	put_device(..);
> 	return ret;
> }
> 
> This way you free resources in the same path.
> 

Thanks. I'll make the change.

> ...
> 
>> +
>> +static struct platform_driver cygnus_gpio_driver = {
>> +	.driver = {
>> +		.name = "cygnus-gpio",
>> +		.of_match_table = cygnus_gpio_of_match,
>> +		.suppress_bind_attrs = true,
>> +	},
>> +	.probe = cygnus_gpio_probe,
>> +};
>> +
>> +static int __init cygnus_gpio_init(void)
>> +{
>> +	return platform_driver_probe(&cygnus_gpio_driver, cygnus_gpio_probe);
> 
> When I asked you to add ".suppress_bind_attrs = true" I missed the fact
> that you were using platform_driver_probe() which already does this
> internally. However platform_driver_probe() can't handle deferred
> probing, which may or may not be OK. Is there a chance that any of the
> resources needed by the driver return -EPROBE_DEFER? If not then it is
> safe to continue using platform_driver_probe() and you can drop
> suppress_bind_attrs assignment, otherwise it may be better to switch to
> platform_driver_register().
> 
> Thanks.
> 

No I do not expect any resource that this driver depends on to return
-EPROBE_DEFER. The IOMUX driver that this driver depends on should be
initialized before this driver.

I'll drop .suppress_bind_attrs then. Thanks.

Ray

[PATCH v8 2/4] pinctrl: cygnus: add gpio/pinconf driver

[Ray Jui]

On 2/9/2015 11:20 AM, Dmitry Torokhov wrote:
> Hi Ray,
> 
> On Wed, Feb 04, 2015 at 09:21:01AM -0800, Ray Jui wrote:
>> +static int cygnus_gpio_pinmux_add_range(struct cygnus_gpio *chip)
>> +{
>> +	struct device_node *node = chip->dev->of_node;
>> +	struct device_node *pinmux_node;
>> +	struct platform_device *pinmux_pdev;
>> +	struct gpio_chip *gc = &chip->gc;
>> +	int i, ret;
>> +
>> +	/* parse DT to find the phandle to the pinmux controller */
>> +	pinmux_node = of_parse_phandle(node, "pinmux", 0);
>> +	if (!pinmux_node)
>> +		return -ENODEV;
>> +
>> +	pinmux_pdev = of_find_device_by_node(pinmux_node);
>> +	if (!pinmux_pdev) {
>> +		dev_err(chip->dev, "failed to get pinmux device\n");
>> +		return -EINVAL;
>> +	}
>> +
>> +	/* now need to create the mapping between local GPIO and PINMUX pins */
>> +	for (i = 0; i < ARRAY_SIZE(cygnus_gpio_pintable); i++) {
>> +		ret = gpiochip_add_pin_range(gc, dev_name(&pinmux_pdev->dev),
>> +					     cygnus_gpio_pintable[i].offset,
>> +					     cygnus_gpio_pintable[i].pin_base,
>> +					     cygnus_gpio_pintable[i].num_pins);
>> +		if (ret) {
>> +			dev_err(chip->dev, "unable to add GPIO pin range\n");
>> +			goto err_put_device;
>> +		}
>> +	}
>> +
>> +	chip->pinmux_is_supported = true;
>> +
>> +	/* no need for pinmux_pdev device reference anymore */
>> +	put_device(&pinmux_pdev->dev);
> 
> Sorry I did not notice it before, but of_parse_phandle() takes reference
> to the returned device node, so you need to "put" it here and in error
> path as well. Actually you can do:
> 
> 	int ret = 0;
> 
> 	pinmux_node = of_parse_phandle(node, "pinmux", 0);
> 	if (!pinmux_node)
> 		return -ENODEV;
> 
> 	pinmux_pdev = of_find_device_by_node(pinmux_node);
> 	/* We do not longer need pinmux node */
> 	of_node_put(pinmux_node);
> 
> 	if (!pinmux_dev)
> 		....
> 
> 	for (..) {
> 		...
> 		if (ret) {
> 			dev_err(...);
> 			break;
> 		}
> 	}
> 
> 	chip->pinmux_is_supported = (ret == 0);
> 	put_device(..);
> 	return ret;
> }
> 
> This way you free resources in the same path.
> 

Thanks. I'll make the change.

> ...
> 
>> +
>> +static struct platform_driver cygnus_gpio_driver = {
>> +	.driver = {
>> +		.name = "cygnus-gpio",
>> +		.of_match_table = cygnus_gpio_of_match,
>> +		.suppress_bind_attrs = true,
>> +	},
>> +	.probe = cygnus_gpio_probe,
>> +};
>> +
>> +static int __init cygnus_gpio_init(void)
>> +{
>> +	return platform_driver_probe(&cygnus_gpio_driver, cygnus_gpio_probe);
> 
> When I asked you to add ".suppress_bind_attrs = true" I missed the fact
> that you were using platform_driver_probe() which already does this
> internally. However platform_driver_probe() can't handle deferred
> probing, which may or may not be OK. Is there a chance that any of the
> resources needed by the driver return -EPROBE_DEFER? If not then it is
> safe to continue using platform_driver_probe() and you can drop
> suppress_bind_attrs assignment, otherwise it may be better to switch to
> platform_driver_register().
> 
> Thanks.
> 

No I do not expect any resource that this driver depends on to return
-EPROBE_DEFER. The IOMUX driver that this driver depends on should be
initialized before this driver.

I'll drop .suppress_bind_attrs then. Thanks.

Ray

Re: [PATCH v4 0/4] Add pinctrl support to Broadcom Cygnus SoC

[Dmitry Torokhov]

On Tue, Feb 03, 2015 at 06:09:57PM -0800, Ray Jui wrote:
> This patchset contains the initial pinctrl (IOMUX) support for the Broadcom
> Cygnus SoC. The Cygnus IOMUX controller supports group based mux configuration
> and allows certain pins to be muxed to GPIO function individually
> 
> Changes from v3:
>  - Fix the driver to have more proper use of "const" in various places
>  - Other minor improvements
> 
> Changes from v2:
>  - Consolidate all Broadcom pinctrl drivers into drivers/pinctrl/bcm/*
>  - Change the Cygnus IOMUX driver to use standard Linux pinctrl subnode
> properties such as "function" and "groups" for pinmux configuration, instead
> of non-standard properties such as "brcm,function" and "brcm,group"
>  - Use real function names like "spi0", "lcd", "key", and etc. instead of HW
> specific mux names like "alt1", "alt2", "alt3", and etc.
>  - Add suffix "grp" to all group names
>  - Add support to allow individual pins to be muxed to GPIO function through
> subsystem callbacks "gpio_request_enable" and "gpio_disable_free", and get rid
> of all GPIO groups
>  - Other minor improvements in the driver
> 
> Changes from v1:
>  - Fix a typo in device tree binding document

FWIW I tested this series on BCM958305K SVK.

Tested-by: Dmitry Torokhov <dtor@chromium.org>

Thanks.

-- 
Dmitry

[PATCH v4 0/4] Add pinctrl support to Broadcom Cygnus SoC

[Dmitry Torokhov]

On Tue, Feb 03, 2015 at 06:09:57PM -0800, Ray Jui wrote:
> This patchset contains the initial pinctrl (IOMUX) support for the Broadcom
> Cygnus SoC. The Cygnus IOMUX controller supports group based mux configuration
> and allows certain pins to be muxed to GPIO function individually
> 
> Changes from v3:
>  - Fix the driver to have more proper use of "const" in various places
>  - Other minor improvements
> 
> Changes from v2:
>  - Consolidate all Broadcom pinctrl drivers into drivers/pinctrl/bcm/*
>  - Change the Cygnus IOMUX driver to use standard Linux pinctrl subnode
> properties such as "function" and "groups" for pinmux configuration, instead
> of non-standard properties such as "brcm,function" and "brcm,group"
>  - Use real function names like "spi0", "lcd", "key", and etc. instead of HW
> specific mux names like "alt1", "alt2", "alt3", and etc.
>  - Add suffix "grp" to all group names
>  - Add support to allow individual pins to be muxed to GPIO function through
> subsystem callbacks "gpio_request_enable" and "gpio_disable_free", and get rid
> of all GPIO groups
>  - Other minor improvements in the driver
> 
> Changes from v1:
>  - Fix a typo in device tree binding document

FWIW I tested this series on BCM958305K SVK.

Tested-by: Dmitry Torokhov <dtor@chromium.org>

Thanks.

-- 
Dmitry

Re: [PATCH v5 0/6] Add common clock support for Broadcom iProc architecture

[Dmitry Torokhov]

On Wed, Feb 04, 2015 at 04:54:59PM -0800, Ray Jui wrote:
> This patchset contains the initial common clock support for Broadcom's iProc
> family of SoCs. The iProc clock architecture comprises of various PLLs, e.g.,
> ARMPLL, GENPLL, LCPLL0, MIPIPLL, and etc. An onboard crystal serves as the
> basic reference clock for these PLLs. Each PLL may have several leaf clocks.
> One special group of clocks is the ASIU clocks, which are dervied directly
> from the crystal reference clock.
> 
> This patchset also contains the basic clock support for the Broadcom Cygnus
> SoC, which implements the iProc clock architecture
> 
> Changes from v4:
>  - Add of_clk_get_parent_rate helper function into the clock framework
>  - Switch to use of_clk_get_parent_rate in the iProc PLL clock driver
> 
> Changes from v3:
>  - Fix incorrect use of passing in of_clk_src_onecell_get when adding ARM PLL
>    and other iProc PLLs as clock provider. These PLLs have zero cells in DT and
>    thefore of_clk_src_simple_get should be used instead
>  - Rename Cygnus MIPI PLL Channel 2 clock from BCM_CYGNUS_MIPIPLL_CH2_UNUSED
>    to BCM_CYGNUS_MIPIPLL_CH2_V3D, since a 3D graphic rendering engine has been
>    integrated into Cygnus revision B0 and has its core clock running off
>    MIPI PLL Channel 2
>  - Changed default MIPI PLL VCO frequency from 1.75 GHz to 2.1 GHz. This allows
>    us to derive 300 MHz V3D clock from channel 2 through the post divisor
> 
> Changes from v2:
>  - Re-arrange Cygnus clock/pll init functions so each init function is right
>    next to its clock table
>  - Removed #defines for number of clocks in Cygnus. Have the number of clocks
>    automatically determined based on array size of the clock table
> 
> Changes from v1:
>  - Separate drivers/clk/Makefile change for drivers/clk/bcm out to a standalone patch

FWIW I tested this series on BCM958305K SVK.

Tested-by: Dmitry Torokhov <dtor@chromium.org>

Thanks.

-- 
Dmitry

Re: [PATCH v5 0/6] Add common clock support for Broadcom iProc architecture

[Dmitry Torokhov]

On Wed, Feb 04, 2015 at 04:54:59PM -0800, Ray Jui wrote:
> This patchset contains the initial common clock support for Broadcom's iProc
> family of SoCs. The iProc clock architecture comprises of various PLLs, e.g.,
> ARMPLL, GENPLL, LCPLL0, MIPIPLL, and etc. An onboard crystal serves as the
> basic reference clock for these PLLs. Each PLL may have several leaf clocks.
> One special group of clocks is the ASIU clocks, which are dervied directly
> from the crystal reference clock.
> 
> This patchset also contains the basic clock support for the Broadcom Cygnus
> SoC, which implements the iProc clock architecture
> 
> Changes from v4:
>  - Add of_clk_get_parent_rate helper function into the clock framework
>  - Switch to use of_clk_get_parent_rate in the iProc PLL clock driver
> 
> Changes from v3:
>  - Fix incorrect use of passing in of_clk_src_onecell_get when adding ARM PLL
>    and other iProc PLLs as clock provider. These PLLs have zero cells in DT and
>    thefore of_clk_src_simple_get should be used instead
>  - Rename Cygnus MIPI PLL Channel 2 clock from BCM_CYGNUS_MIPIPLL_CH2_UNUSED
>    to BCM_CYGNUS_MIPIPLL_CH2_V3D, since a 3D graphic rendering engine has been
>    integrated into Cygnus revision B0 and has its core clock running off
>    MIPI PLL Channel 2
>  - Changed default MIPI PLL VCO frequency from 1.75 GHz to 2.1 GHz. This allows
>    us to derive 300 MHz V3D clock from channel 2 through the post divisor
> 
> Changes from v2:
>  - Re-arrange Cygnus clock/pll init functions so each init function is right
>    next to its clock table
>  - Removed #defines for number of clocks in Cygnus. Have the number of clocks
>    automatically determined based on array size of the clock table
> 
> Changes from v1:
>  - Separate drivers/clk/Makefile change for drivers/clk/bcm out to a standalone patch

FWIW I tested this series on BCM958305K SVK.

Tested-by: Dmitry Torokhov <dtor-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>

Thanks.

-- 
Dmitry
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[PATCH v5 0/6] Add common clock support for Broadcom iProc architecture

[Dmitry Torokhov]

On Wed, Feb 04, 2015 at 04:54:59PM -0800, Ray Jui wrote:
> This patchset contains the initial common clock support for Broadcom's iProc
> family of SoCs. The iProc clock architecture comprises of various PLLs, e.g.,
> ARMPLL, GENPLL, LCPLL0, MIPIPLL, and etc. An onboard crystal serves as the
> basic reference clock for these PLLs. Each PLL may have several leaf clocks.
> One special group of clocks is the ASIU clocks, which are dervied directly
> from the crystal reference clock.
> 
> This patchset also contains the basic clock support for the Broadcom Cygnus
> SoC, which implements the iProc clock architecture
> 
> Changes from v4:
>  - Add of_clk_get_parent_rate helper function into the clock framework
>  - Switch to use of_clk_get_parent_rate in the iProc PLL clock driver
> 
> Changes from v3:
>  - Fix incorrect use of passing in of_clk_src_onecell_get when adding ARM PLL
>    and other iProc PLLs as clock provider. These PLLs have zero cells in DT and
>    thefore of_clk_src_simple_get should be used instead
>  - Rename Cygnus MIPI PLL Channel 2 clock from BCM_CYGNUS_MIPIPLL_CH2_UNUSED
>    to BCM_CYGNUS_MIPIPLL_CH2_V3D, since a 3D graphic rendering engine has been
>    integrated into Cygnus revision B0 and has its core clock running off
>    MIPI PLL Channel 2
>  - Changed default MIPI PLL VCO frequency from 1.75 GHz to 2.1 GHz. This allows
>    us to derive 300 MHz V3D clock from channel 2 through the post divisor
> 
> Changes from v2:
>  - Re-arrange Cygnus clock/pll init functions so each init function is right
>    next to its clock table
>  - Removed #defines for number of clocks in Cygnus. Have the number of clocks
>    automatically determined based on array size of the clock table
> 
> Changes from v1:
>  - Separate drivers/clk/Makefile change for drivers/clk/bcm out to a standalone patch

FWIW I tested this series on BCM958305K SVK.

Tested-by: Dmitry Torokhov <dtor@chromium.org>

Thanks.

-- 
Dmitry

Re: [PATCH v5 1/6] clk: add of_clk_get_parent_rate function

[Stephen Boyd]

On 02/04/15 16:55, Ray Jui wrote:
> Sometimes a clock needs to know the rate of its parent before itself is
> registered to the framework. An example is that a PLL may need to
> initialize itself to a specific VCO frequency, before registering to the
> framework. The parent rate needs to be known, for PLL multipliers and
> divisors to be configured properly.
>
> Introduce helper function of_clk_get_parent_rate, which can be used to
> obtain the parent rate of a clock, given a device node and index.
>
> Signed-off-by: Ray Jui <rjui@broadcom.com>

Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

[PATCH v5 1/6] clk: add of_clk_get_parent_rate function

[Stephen Boyd]

On 02/04/15 16:55, Ray Jui wrote:
> Sometimes a clock needs to know the rate of its parent before itself is
> registered to the framework. An example is that a PLL may need to
> initialize itself to a specific VCO frequency, before registering to the
> framework. The parent rate needs to be known, for PLL multipliers and
> divisors to be configured properly.
>
> Introduce helper function of_clk_get_parent_rate, which can be used to
> obtain the parent rate of a clock, given a device node and index.
>
> Signed-off-by: Ray Jui <rjui@broadcom.com>

Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

Re: [PATCH v5 1/6] clk: add of_clk_get_parent_rate function

[Sascha Hauer]

Hi Ray,

On Wed, Feb 04, 2015 at 04:55:00PM -0800, Ray Jui wrote:
> Sometimes a clock needs to know the rate of its parent before itself is
> registered to the framework. An example is that a PLL may need to
> initialize itself to a specific VCO frequency, before registering to the
> framework. The parent rate needs to be known, for PLL multipliers and
> divisors to be configured properly.
> 
> Introduce helper function of_clk_get_parent_rate, which can be used to
> obtain the parent rate of a clock, given a device node and index.

I can't see how this patch helps you. First it's not guaranteed that
the parent is already registered, what do you do in this case?
Then the clock framework doesn't require that you initialize the PLL
before registering. That can be done in the clk ops later.

Sascha

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

[PATCH v5 1/6] clk: add of_clk_get_parent_rate function

[Sascha Hauer]

Hi Ray,

On Wed, Feb 04, 2015 at 04:55:00PM -0800, Ray Jui wrote:
> Sometimes a clock needs to know the rate of its parent before itself is
> registered to the framework. An example is that a PLL may need to
> initialize itself to a specific VCO frequency, before registering to the
> framework. The parent rate needs to be known, for PLL multipliers and
> divisors to be configured properly.
> 
> Introduce helper function of_clk_get_parent_rate, which can be used to
> obtain the parent rate of a clock, given a device node and index.

I can't see how this patch helps you. First it's not guaranteed that
the parent is already registered, what do you do in this case?
Then the clock framework doesn't require that you initialize the PLL
before registering. That can be done in the clk ops later.

Sascha

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

Re: [PATCH v5 1/6] clk: add of_clk_get_parent_rate function

[Ray Jui]

Hi Sascha,

On 2/25/2015 9:54 PM, Sascha Hauer wrote:
> Hi Ray,
> 
> On Wed, Feb 04, 2015 at 04:55:00PM -0800, Ray Jui wrote:
>> Sometimes a clock needs to know the rate of its parent before itself is
>> registered to the framework. An example is that a PLL may need to
>> initialize itself to a specific VCO frequency, before registering to the
>> framework. The parent rate needs to be known, for PLL multipliers and
>> divisors to be configured properly.
>>
>> Introduce helper function of_clk_get_parent_rate, which can be used to
>> obtain the parent rate of a clock, given a device node and index.
> 
> I can't see how this patch helps you. First it's not guaranteed that
> the parent is already registered, what do you do in this case?

In the case when clock parent is not found, as you can see from the
code, it simply returns zero, just like other clk get rate APIs.

I thought the order of clock registration is based on order of the clock
nodes in device tree. It makes sense to me to declare the parent clock
before a child clock, so it's guaranteed that the parent is registered
before the child.

> Then the clock framework doesn't require that you initialize the PLL
> before registering. That can be done in the clk ops later.

Sure it's not mandatory. But what's wrong with me choosing to initialize
the PLL clock to a known frequency before registering it to the framework?

Ray

Re: [PATCH v5 1/6] clk: add of_clk_get_parent_rate function

[Ray Jui]

Hi Sascha,

On 2/25/2015 9:54 PM, Sascha Hauer wrote:
> Hi Ray,
> 
> On Wed, Feb 04, 2015 at 04:55:00PM -0800, Ray Jui wrote:
>> Sometimes a clock needs to know the rate of its parent before itself is
>> registered to the framework. An example is that a PLL may need to
>> initialize itself to a specific VCO frequency, before registering to the
>> framework. The parent rate needs to be known, for PLL multipliers and
>> divisors to be configured properly.
>>
>> Introduce helper function of_clk_get_parent_rate, which can be used to
>> obtain the parent rate of a clock, given a device node and index.
> 
> I can't see how this patch helps you. First it's not guaranteed that
> the parent is already registered, what do you do in this case?

In the case when clock parent is not found, as you can see from the
code, it simply returns zero, just like other clk get rate APIs.

I thought the order of clock registration is based on order of the clock
nodes in device tree. It makes sense to me to declare the parent clock
before a child clock, so it's guaranteed that the parent is registered
before the child.

> Then the clock framework doesn't require that you initialize the PLL
> before registering. That can be done in the clk ops later.

Sure it's not mandatory. But what's wrong with me choosing to initialize
the PLL clock to a known frequency before registering it to the framework?

Ray

[PATCH v5 1/6] clk: add of_clk_get_parent_rate function

[Ray Jui]

Hi Sascha,

On 2/25/2015 9:54 PM, Sascha Hauer wrote:
> Hi Ray,
> 
> On Wed, Feb 04, 2015 at 04:55:00PM -0800, Ray Jui wrote:
>> Sometimes a clock needs to know the rate of its parent before itself is
>> registered to the framework. An example is that a PLL may need to
>> initialize itself to a specific VCO frequency, before registering to the
>> framework. The parent rate needs to be known, for PLL multipliers and
>> divisors to be configured properly.
>>
>> Introduce helper function of_clk_get_parent_rate, which can be used to
>> obtain the parent rate of a clock, given a device node and index.
> 
> I can't see how this patch helps you. First it's not guaranteed that
> the parent is already registered, what do you do in this case?

In the case when clock parent is not found, as you can see from the
code, it simply returns zero, just like other clk get rate APIs.

I thought the order of clock registration is based on order of the clock
nodes in device tree. It makes sense to me to declare the parent clock
before a child clock, so it's guaranteed that the parent is registered
before the child.

> Then the clock framework doesn't require that you initialize the PLL
> before registering. That can be done in the clk ops later.

Sure it's not mandatory. But what's wrong with me choosing to initialize
the PLL clock to a known frequency before registering it to the framework?

Ray

Re: [PATCH v5 1/6] clk: add of_clk_get_parent_rate function

[Sascha Hauer]

On Wed, Feb 25, 2015 at 10:13:15PM -0800, Ray Jui wrote:
> Hi Sascha,
> 
> On 2/25/2015 9:54 PM, Sascha Hauer wrote:
> > Hi Ray,
> > 
> > On Wed, Feb 04, 2015 at 04:55:00PM -0800, Ray Jui wrote:
> >> Sometimes a clock needs to know the rate of its parent before itself is
> >> registered to the framework. An example is that a PLL may need to
> >> initialize itself to a specific VCO frequency, before registering to the
> >> framework. The parent rate needs to be known, for PLL multipliers and
> >> divisors to be configured properly.
> >>
> >> Introduce helper function of_clk_get_parent_rate, which can be used to
> >> obtain the parent rate of a clock, given a device node and index.
> > 
> > I can't see how this patch helps you. First it's not guaranteed that
> > the parent is already registered, what do you do in this case?
> 
> In the case when clock parent is not found, as you can see from the
> code, it simply returns zero, just like other clk get rate APIs.

Yes, but what do you do with the 0 result then in your PLL initialization?

> 
> I thought the order of clock registration is based on order of the clock
> nodes in device tree. It makes sense to me to declare the parent clock
> before a child clock, so it's guaranteed that the parent is registered
> before the child.

No, you can't rely on that. The order of the device nodes may happen to
define the order of clock initialization now, but that may change.
device nodes are usually ordered by bus addresses, not by intended
initialization order. Even if you reorder them everything must still
work.

> 
> > Then the clock framework doesn't require that you initialize the PLL
> > before registering. That can be done in the clk ops later.
> 
> Sure it's not mandatory. But what's wrong with me choosing to initialize
> the PLL clock to a known frequency before registering it to the framework?

Appearantly you don't know the (input) frequency of the PLL when
registering it to the framework, so the question must be: What's wrong
with keeping it uninitialized?

If the PLL is unused then you don't care about it's initialization
status. If it happens to be enabled by a bootloader and still unused
at late_initcall time the clock framework will disable it so you
have a known state then. If a consumer for the PLL appears it's its
job to initialize it through the clk api.

Sascha

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

Re: [PATCH v5 1/6] clk: add of_clk_get_parent_rate function

[Sascha Hauer]

On Wed, Feb 25, 2015 at 10:13:15PM -0800, Ray Jui wrote:
> Hi Sascha,
> 
> On 2/25/2015 9:54 PM, Sascha Hauer wrote:
> > Hi Ray,
> > 
> > On Wed, Feb 04, 2015 at 04:55:00PM -0800, Ray Jui wrote:
> >> Sometimes a clock needs to know the rate of its parent before itself is
> >> registered to the framework. An example is that a PLL may need to
> >> initialize itself to a specific VCO frequency, before registering to the
> >> framework. The parent rate needs to be known, for PLL multipliers and
> >> divisors to be configured properly.
> >>
> >> Introduce helper function of_clk_get_parent_rate, which can be used to
> >> obtain the parent rate of a clock, given a device node and index.
> > 
> > I can't see how this patch helps you. First it's not guaranteed that
> > the parent is already registered, what do you do in this case?
> 
> In the case when clock parent is not found, as you can see from the
> code, it simply returns zero, just like other clk get rate APIs.

Yes, but what do you do with the 0 result then in your PLL initialization?

> 
> I thought the order of clock registration is based on order of the clock
> nodes in device tree. It makes sense to me to declare the parent clock
> before a child clock, so it's guaranteed that the parent is registered
> before the child.

No, you can't rely on that. The order of the device nodes may happen to
define the order of clock initialization now, but that may change.
device nodes are usually ordered by bus addresses, not by intended
initialization order. Even if you reorder them everything must still
work.

> 
> > Then the clock framework doesn't require that you initialize the PLL
> > before registering. That can be done in the clk ops later.
> 
> Sure it's not mandatory. But what's wrong with me choosing to initialize
> the PLL clock to a known frequency before registering it to the framework?

Appearantly you don't know the (input) frequency of the PLL when
registering it to the framework, so the question must be: What's wrong
with keeping it uninitialized?

If the PLL is unused then you don't care about it's initialization
status. If it happens to be enabled by a bootloader and still unused
at late_initcall time the clock framework will disable it so you
have a known state then. If a consumer for the PLL appears it's its
job to initialize it through the clk api.

Sascha

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |
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[PATCH v5 1/6] clk: add of_clk_get_parent_rate function

[Sascha Hauer]

On Wed, Feb 25, 2015 at 10:13:15PM -0800, Ray Jui wrote:
> Hi Sascha,
> 
> On 2/25/2015 9:54 PM, Sascha Hauer wrote:
> > Hi Ray,
> > 
> > On Wed, Feb 04, 2015 at 04:55:00PM -0800, Ray Jui wrote:
> >> Sometimes a clock needs to know the rate of its parent before itself is
> >> registered to the framework. An example is that a PLL may need to
> >> initialize itself to a specific VCO frequency, before registering to the
> >> framework. The parent rate needs to be known, for PLL multipliers and
> >> divisors to be configured properly.
> >>
> >> Introduce helper function of_clk_get_parent_rate, which can be used to
> >> obtain the parent rate of a clock, given a device node and index.
> > 
> > I can't see how this patch helps you. First it's not guaranteed that
> > the parent is already registered, what do you do in this case?
> 
> In the case when clock parent is not found, as you can see from the
> code, it simply returns zero, just like other clk get rate APIs.

Yes, but what do you do with the 0 result then in your PLL initialization?

> 
> I thought the order of clock registration is based on order of the clock
> nodes in device tree. It makes sense to me to declare the parent clock
> before a child clock, so it's guaranteed that the parent is registered
> before the child.

No, you can't rely on that. The order of the device nodes may happen to
define the order of clock initialization now, but that may change.
device nodes are usually ordered by bus addresses, not by intended
initialization order. Even if you reorder them everything must still
work.

> 
> > Then the clock framework doesn't require that you initialize the PLL
> > before registering. That can be done in the clk ops later.
> 
> Sure it's not mandatory. But what's wrong with me choosing to initialize
> the PLL clock to a known frequency before registering it to the framework?

Appearantly you don't know the (input) frequency of the PLL when
registering it to the framework, so the question must be: What's wrong
with keeping it uninitialized?

If the PLL is unused then you don't care about it's initialization
status. If it happens to be enabled by a bootloader and still unused
at late_initcall time the clock framework will disable it so you
have a known state then. If a consumer for the PLL appears it's its
job to initialize it through the clk api.

Sascha

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

Re: [PATCH v5 1/6] clk: add of_clk_get_parent_rate function

[Ray Jui]

On 2/25/2015 10:51 PM, Sascha Hauer wrote:
> On Wed, Feb 25, 2015 at 10:13:15PM -0800, Ray Jui wrote:
>> Hi Sascha,
>>
>> On 2/25/2015 9:54 PM, Sascha Hauer wrote:
>>> Hi Ray,
>>>
>>> On Wed, Feb 04, 2015 at 04:55:00PM -0800, Ray Jui wrote:
>>>> Sometimes a clock needs to know the rate of its parent before itself is
>>>> registered to the framework. An example is that a PLL may need to
>>>> initialize itself to a specific VCO frequency, before registering to the
>>>> framework. The parent rate needs to be known, for PLL multipliers and
>>>> divisors to be configured properly.
>>>>
>>>> Introduce helper function of_clk_get_parent_rate, which can be used to
>>>> obtain the parent rate of a clock, given a device node and index.
>>>
>>> I can't see how this patch helps you. First it's not guaranteed that
>>> the parent is already registered, what do you do in this case?
>>
>> In the case when clock parent is not found, as you can see from the
>> code, it simply returns zero, just like other clk get rate APIs.
> 
> Yes, but what do you do with the 0 result then in your PLL initialization?
> 

As of the current code, it fails the PLL frequency initialization and
bails out. Thinking about it more, it actually makes more sense to just
warn and still go ahead to register the clock, in which case it will use
whatever default frequency after chip power on reset or a frequency
configured in the bootloader.

>>
>> I thought the order of clock registration is based on order of the clock
>> nodes in device tree. It makes sense to me to declare the parent clock
>> before a child clock, so it's guaranteed that the parent is registered
>> before the child.
> 
> No, you can't rely on that. The order of the device nodes may happen to
> define the order of clock initialization now, but that may change.
> device nodes are usually ordered by bus addresses, not by intended
> initialization order. Even if you reorder them everything must still
> work.
> 

Okay I get your point that the order of device nodes may not be relied
on for device initialization order. But then another mechanism should be
deployed to give developers the option to decide on the clock
initialization sequence. It can be optional but it should be there.

>>
>>> Then the clock framework doesn't require that you initialize the PLL
>>> before registering. That can be done in the clk ops later.
>>
>> Sure it's not mandatory. But what's wrong with me choosing to initialize
>> the PLL clock to a known frequency before registering it to the framework?
> 
> Appearantly you don't know the (input) frequency of the PLL when
> registering it to the framework, so the question must be: What's wrong
> with keeping it uninitialized?
> 
> If the PLL is unused then you don't care about it's initialization
> status. If it happens to be enabled by a bootloader and still unused
> at late_initcall time the clock framework will disable it so you
> have a known state then. If a consumer for the PLL appears it's its
> job to initialize it through the clk api.
> 
> Sascha
> 

Okay, what we need here is to initialize the PLL to a desired frequency,
based on device tree settings (since it will be configured differently,
among different boards). This is a PLL that 1) has limited options of
frequencies which it can be configured to, and 2) has multiple child
clocks, where is a more suitable place to initialize it to the desired
frequency than right before registering it to the framework? I know a
lot of people do it in the bootloader, but I thought we should be given
the flexibility of configuring it in the kernel.

When you say "consumers", do you mean 1) the device driver that uses the
PLL; or 2) the device driver that use the child clock of the PLL? If
it's case 1), then we don't really have a device driver that directly
uses the PLL, and I thought that's quite normal, as most PLLs don't
directly feed into any peripherals.

We do have multiple device drivers that use the child clocks of the PLL,
but it makes no sense to configure the PLL clock in any of those drivers.

Ray

Re: [PATCH v5 1/6] clk: add of_clk_get_parent_rate function

[Ray Jui]

On 2/25/2015 10:51 PM, Sascha Hauer wrote:
> On Wed, Feb 25, 2015 at 10:13:15PM -0800, Ray Jui wrote:
>> Hi Sascha,
>>
>> On 2/25/2015 9:54 PM, Sascha Hauer wrote:
>>> Hi Ray,
>>>
>>> On Wed, Feb 04, 2015 at 04:55:00PM -0800, Ray Jui wrote:
>>>> Sometimes a clock needs to know the rate of its parent before itself is
>>>> registered to the framework. An example is that a PLL may need to
>>>> initialize itself to a specific VCO frequency, before registering to the
>>>> framework. The parent rate needs to be known, for PLL multipliers and
>>>> divisors to be configured properly.
>>>>
>>>> Introduce helper function of_clk_get_parent_rate, which can be used to
>>>> obtain the parent rate of a clock, given a device node and index.
>>>
>>> I can't see how this patch helps you. First it's not guaranteed that
>>> the parent is already registered, what do you do in this case?
>>
>> In the case when clock parent is not found, as you can see from the
>> code, it simply returns zero, just like other clk get rate APIs.
> 
> Yes, but what do you do with the 0 result then in your PLL initialization?
> 

As of the current code, it fails the PLL frequency initialization and
bails out. Thinking about it more, it actually makes more sense to just
warn and still go ahead to register the clock, in which case it will use
whatever default frequency after chip power on reset or a frequency
configured in the bootloader.

>>
>> I thought the order of clock registration is based on order of the clock
>> nodes in device tree. It makes sense to me to declare the parent clock
>> before a child clock, so it's guaranteed that the parent is registered
>> before the child.
> 
> No, you can't rely on that. The order of the device nodes may happen to
> define the order of clock initialization now, but that may change.
> device nodes are usually ordered by bus addresses, not by intended
> initialization order. Even if you reorder them everything must still
> work.
> 

Okay I get your point that the order of device nodes may not be relied
on for device initialization order. But then another mechanism should be
deployed to give developers the option to decide on the clock
initialization sequence. It can be optional but it should be there.

>>
>>> Then the clock framework doesn't require that you initialize the PLL
>>> before registering. That can be done in the clk ops later.
>>
>> Sure it's not mandatory. But what's wrong with me choosing to initialize
>> the PLL clock to a known frequency before registering it to the framework?
> 
> Appearantly you don't know the (input) frequency of the PLL when
> registering it to the framework, so the question must be: What's wrong
> with keeping it uninitialized?
> 
> If the PLL is unused then you don't care about it's initialization
> status. If it happens to be enabled by a bootloader and still unused
> at late_initcall time the clock framework will disable it so you
> have a known state then. If a consumer for the PLL appears it's its
> job to initialize it through the clk api.
> 
> Sascha
> 

Okay, what we need here is to initialize the PLL to a desired frequency,
based on device tree settings (since it will be configured differently,
among different boards). This is a PLL that 1) has limited options of
frequencies which it can be configured to, and 2) has multiple child
clocks, where is a more suitable place to initialize it to the desired
frequency than right before registering it to the framework? I know a
lot of people do it in the bootloader, but I thought we should be given
the flexibility of configuring it in the kernel.

When you say "consumers", do you mean 1) the device driver that uses the
PLL; or 2) the device driver that use the child clock of the PLL? If
it's case 1), then we don't really have a device driver that directly
uses the PLL, and I thought that's quite normal, as most PLLs don't
directly feed into any peripherals.

We do have multiple device drivers that use the child clocks of the PLL,
but it makes no sense to configure the PLL clock in any of those drivers.

Ray
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[PATCH v5 1/6] clk: add of_clk_get_parent_rate function

[Ray Jui]

On 2/25/2015 10:51 PM, Sascha Hauer wrote:
> On Wed, Feb 25, 2015 at 10:13:15PM -0800, Ray Jui wrote:
>> Hi Sascha,
>>
>> On 2/25/2015 9:54 PM, Sascha Hauer wrote:
>>> Hi Ray,
>>>
>>> On Wed, Feb 04, 2015 at 04:55:00PM -0800, Ray Jui wrote:
>>>> Sometimes a clock needs to know the rate of its parent before itself is
>>>> registered to the framework. An example is that a PLL may need to
>>>> initialize itself to a specific VCO frequency, before registering to the
>>>> framework. The parent rate needs to be known, for PLL multipliers and
>>>> divisors to be configured properly.
>>>>
>>>> Introduce helper function of_clk_get_parent_rate, which can be used to
>>>> obtain the parent rate of a clock, given a device node and index.
>>>
>>> I can't see how this patch helps you. First it's not guaranteed that
>>> the parent is already registered, what do you do in this case?
>>
>> In the case when clock parent is not found, as you can see from the
>> code, it simply returns zero, just like other clk get rate APIs.
> 
> Yes, but what do you do with the 0 result then in your PLL initialization?
> 

As of the current code, it fails the PLL frequency initialization and
bails out. Thinking about it more, it actually makes more sense to just
warn and still go ahead to register the clock, in which case it will use
whatever default frequency after chip power on reset or a frequency
configured in the bootloader.

>>
>> I thought the order of clock registration is based on order of the clock
>> nodes in device tree. It makes sense to me to declare the parent clock
>> before a child clock, so it's guaranteed that the parent is registered
>> before the child.
> 
> No, you can't rely on that. The order of the device nodes may happen to
> define the order of clock initialization now, but that may change.
> device nodes are usually ordered by bus addresses, not by intended
> initialization order. Even if you reorder them everything must still
> work.
> 

Okay I get your point that the order of device nodes may not be relied
on for device initialization order. But then another mechanism should be
deployed to give developers the option to decide on the clock
initialization sequence. It can be optional but it should be there.

>>
>>> Then the clock framework doesn't require that you initialize the PLL
>>> before registering. That can be done in the clk ops later.
>>
>> Sure it's not mandatory. But what's wrong with me choosing to initialize
>> the PLL clock to a known frequency before registering it to the framework?
> 
> Appearantly you don't know the (input) frequency of the PLL when
> registering it to the framework, so the question must be: What's wrong
> with keeping it uninitialized?
> 
> If the PLL is unused then you don't care about it's initialization
> status. If it happens to be enabled by a bootloader and still unused
> at late_initcall time the clock framework will disable it so you
> have a known state then. If a consumer for the PLL appears it's its
> job to initialize it through the clk api.
> 
> Sascha
> 

Okay, what we need here is to initialize the PLL to a desired frequency,
based on device tree settings (since it will be configured differently,
among different boards). This is a PLL that 1) has limited options of
frequencies which it can be configured to, and 2) has multiple child
clocks, where is a more suitable place to initialize it to the desired
frequency than right before registering it to the framework? I know a
lot of people do it in the bootloader, but I thought we should be given
the flexibility of configuring it in the kernel.

When you say "consumers", do you mean 1) the device driver that uses the
PLL; or 2) the device driver that use the child clock of the PLL? If
it's case 1), then we don't really have a device driver that directly
uses the PLL, and I thought that's quite normal, as most PLLs don't
directly feed into any peripherals.

We do have multiple device drivers that use the child clocks of the PLL,
but it makes no sense to configure the PLL clock in any of those drivers.

Ray

Re: [PATCH v5 1/6] clk: add of_clk_get_parent_rate function

[Sascha Hauer]

On Wed, Feb 25, 2015 at 11:42:44PM -0800, Ray Jui wrote:
> On 2/25/2015 10:51 PM, Sascha Hauer wrote:
> > On Wed, Feb 25, 2015 at 10:13:15PM -0800, Ray Jui wrote:
> >> Hi Sascha,
> >>
> >> On 2/25/2015 9:54 PM, Sascha Hauer wrote:
> >>> Hi Ray,
> >>>
> >>> On Wed, Feb 04, 2015 at 04:55:00PM -0800, Ray Jui wrote:
> >>>> Sometimes a clock needs to know the rate of its parent before itself is
> >>>> registered to the framework. An example is that a PLL may need to
> >>>> initialize itself to a specific VCO frequency, before registering to the
> >>>> framework. The parent rate needs to be known, for PLL multipliers and
> >>>> divisors to be configured properly.
> >>>>
> >>>> Introduce helper function of_clk_get_parent_rate, which can be used to
> >>>> obtain the parent rate of a clock, given a device node and index.
> >>>
> >>> I can't see how this patch helps you. First it's not guaranteed that
> >>> the parent is already registered, what do you do in this case?
> >>
> >> In the case when clock parent is not found, as you can see from the
> >> code, it simply returns zero, just like other clk get rate APIs.
> > 
> > Yes, but what do you do with the 0 result then in your PLL initialization?
> > 
> 
> As of the current code, it fails the PLL frequency initialization and
> bails out. Thinking about it more, it actually makes more sense to just
> warn and still go ahead to register the clock, in which case it will use
> whatever default frequency after chip power on reset or a frequency
> configured in the bootloader.
> 
> >>
> >> I thought the order of clock registration is based on order of the clock
> >> nodes in device tree. It makes sense to me to declare the parent clock
> >> before a child clock, so it's guaranteed that the parent is registered
> >> before the child.
> > 
> > No, you can't rely on that. The order of the device nodes may happen to
> > define the order of clock initialization now, but that may change.
> > device nodes are usually ordered by bus addresses, not by intended
> > initialization order. Even if you reorder them everything must still
> > work.
> > 
> 
> Okay I get your point that the order of device nodes may not be relied
> on for device initialization order. But then another mechanism should be
> deployed to give developers the option to decide on the clock
> initialization sequence. It can be optional but it should be there.
> 
> >>
> >>> Then the clock framework doesn't require that you initialize the PLL
> >>> before registering. That can be done in the clk ops later.
> >>
> >> Sure it's not mandatory. But what's wrong with me choosing to initialize
> >> the PLL clock to a known frequency before registering it to the framework?
> > 
> > Appearantly you don't know the (input) frequency of the PLL when
> > registering it to the framework, so the question must be: What's wrong
> > with keeping it uninitialized?
> > 
> > If the PLL is unused then you don't care about it's initialization
> > status. If it happens to be enabled by a bootloader and still unused
> > at late_initcall time the clock framework will disable it so you
> > have a known state then. If a consumer for the PLL appears it's its
> > job to initialize it through the clk api.
> > 
> > Sascha
> > 
> 
> Okay, what we need here is to initialize the PLL to a desired frequency,
> based on device tree settings (since it will be configured differently,
> among different boards). This is a PLL that 1) has limited options of
> frequencies which it can be configured to, and 2) has multiple child
> clocks, where is a more suitable place to initialize it to the desired
> frequency than right before registering it to the framework? I know a
> lot of people do it in the bootloader, but I thought we should be given
> the flexibility of configuring it in the kernel.
> 
> When you say "consumers", do you mean 1) the device driver that uses the
> PLL; or 2) the device driver that use the child clock of the PLL? If
> it's case 1), then we don't really have a device driver that directly
> uses the PLL, and I thought that's quite normal, as most PLLs don't
> directly feed into any peripherals.

I meant 1) and 2). Before a consumer comes along the state of the PLL
doesn't matter. When a consumer shows up it has to call
clk_prepare_enable which (directly or indirectly) will enable your PLL.
Then it's still time to apply the default settings you found out during
probe of the PLL.

Sascha

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

[PATCH v5 1/6] clk: add of_clk_get_parent_rate function

[Sascha Hauer]

On Wed, Feb 25, 2015 at 11:42:44PM -0800, Ray Jui wrote:
> On 2/25/2015 10:51 PM, Sascha Hauer wrote:
> > On Wed, Feb 25, 2015 at 10:13:15PM -0800, Ray Jui wrote:
> >> Hi Sascha,
> >>
> >> On 2/25/2015 9:54 PM, Sascha Hauer wrote:
> >>> Hi Ray,
> >>>
> >>> On Wed, Feb 04, 2015 at 04:55:00PM -0800, Ray Jui wrote:
> >>>> Sometimes a clock needs to know the rate of its parent before itself is
> >>>> registered to the framework. An example is that a PLL may need to
> >>>> initialize itself to a specific VCO frequency, before registering to the
> >>>> framework. The parent rate needs to be known, for PLL multipliers and
> >>>> divisors to be configured properly.
> >>>>
> >>>> Introduce helper function of_clk_get_parent_rate, which can be used to
> >>>> obtain the parent rate of a clock, given a device node and index.
> >>>
> >>> I can't see how this patch helps you. First it's not guaranteed that
> >>> the parent is already registered, what do you do in this case?
> >>
> >> In the case when clock parent is not found, as you can see from the
> >> code, it simply returns zero, just like other clk get rate APIs.
> > 
> > Yes, but what do you do with the 0 result then in your PLL initialization?
> > 
> 
> As of the current code, it fails the PLL frequency initialization and
> bails out. Thinking about it more, it actually makes more sense to just
> warn and still go ahead to register the clock, in which case it will use
> whatever default frequency after chip power on reset or a frequency
> configured in the bootloader.
> 
> >>
> >> I thought the order of clock registration is based on order of the clock
> >> nodes in device tree. It makes sense to me to declare the parent clock
> >> before a child clock, so it's guaranteed that the parent is registered
> >> before the child.
> > 
> > No, you can't rely on that. The order of the device nodes may happen to
> > define the order of clock initialization now, but that may change.
> > device nodes are usually ordered by bus addresses, not by intended
> > initialization order. Even if you reorder them everything must still
> > work.
> > 
> 
> Okay I get your point that the order of device nodes may not be relied
> on for device initialization order. But then another mechanism should be
> deployed to give developers the option to decide on the clock
> initialization sequence. It can be optional but it should be there.
> 
> >>
> >>> Then the clock framework doesn't require that you initialize the PLL
> >>> before registering. That can be done in the clk ops later.
> >>
> >> Sure it's not mandatory. But what's wrong with me choosing to initialize
> >> the PLL clock to a known frequency before registering it to the framework?
> > 
> > Appearantly you don't know the (input) frequency of the PLL when
> > registering it to the framework, so the question must be: What's wrong
> > with keeping it uninitialized?
> > 
> > If the PLL is unused then you don't care about it's initialization
> > status. If it happens to be enabled by a bootloader and still unused
> > at late_initcall time the clock framework will disable it so you
> > have a known state then. If a consumer for the PLL appears it's its
> > job to initialize it through the clk api.
> > 
> > Sascha
> > 
> 
> Okay, what we need here is to initialize the PLL to a desired frequency,
> based on device tree settings (since it will be configured differently,
> among different boards). This is a PLL that 1) has limited options of
> frequencies which it can be configured to, and 2) has multiple child
> clocks, where is a more suitable place to initialize it to the desired
> frequency than right before registering it to the framework? I know a
> lot of people do it in the bootloader, but I thought we should be given
> the flexibility of configuring it in the kernel.
> 
> When you say "consumers", do you mean 1) the device driver that uses the
> PLL; or 2) the device driver that use the child clock of the PLL? If
> it's case 1), then we don't really have a device driver that directly
> uses the PLL, and I thought that's quite normal, as most PLLs don't
> directly feed into any peripherals.

I meant 1) and 2). Before a consumer comes along the state of the PLL
doesn't matter. When a consumer shows up it has to call
clk_prepare_enable which (directly or indirectly) will enable your PLL.
Then it's still time to apply the default settings you found out during
probe of the PLL.

Sascha

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

Re: [PATCH v4 1/4] pinctrl: bcm: consolidate Broadcom pinctrl drivers

[Linus Walleij]

On Wed, Feb 4, 2015 at 3:09 AM, Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org> wrote:

> Consolidate Broadcom pinctrl drivers into drivers/pinctrl/bcm/*
>
> Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>

This patch doesn't apply so it needs to be rebased on v4.0-rc1 and resent.

And also when just moving files, always do this:

git format-patch -M ...

So that file movement is detected, and the patch will apply nicely even
if the contents of the file(s) have changed.

Can you also combine this series with the v9 GPIO etc series and
send out ONE big patch set that I can look at because right now I'm
getting really confused ...

I'll look over the rest and see if there is some remaining technical
comments (hopefully mainly patch mechanics remains).

Yours,
Linus Walleij
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: [PATCH v4 1/4] pinctrl: bcm: consolidate Broadcom pinctrl drivers

[Linus Walleij]

On Wed, Feb 4, 2015 at 3:09 AM, Ray Jui <rjui@broadcom.com> wrote:

> Consolidate Broadcom pinctrl drivers into drivers/pinctrl/bcm/*
>
> Signed-off-by: Ray Jui <rjui@broadcom.com>

This patch doesn't apply so it needs to be rebased on v4.0-rc1 and resent.

And also when just moving files, always do this:

git format-patch -M ...

So that file movement is detected, and the patch will apply nicely even
if the contents of the file(s) have changed.

Can you also combine this series with the v9 GPIO etc series and
send out ONE big patch set that I can look at because right now I'm
getting really confused ...

I'll look over the rest and see if there is some remaining technical
comments (hopefully mainly patch mechanics remains).

Yours,
Linus Walleij

[PATCH v4 1/4] pinctrl: bcm: consolidate Broadcom pinctrl drivers

[Linus Walleij]

On Wed, Feb 4, 2015 at 3:09 AM, Ray Jui <rjui@broadcom.com> wrote:

> Consolidate Broadcom pinctrl drivers into drivers/pinctrl/bcm/*
>
> Signed-off-by: Ray Jui <rjui@broadcom.com>

This patch doesn't apply so it needs to be rebased on v4.0-rc1 and resent.

And also when just moving files, always do this:

git format-patch -M ...

So that file movement is detected, and the patch will apply nicely even
if the contents of the file(s) have changed.

Can you also combine this series with the v9 GPIO etc series and
send out ONE big patch set that I can look at because right now I'm
getting really confused ...

I'll look over the rest and see if there is some remaining technical
comments (hopefully mainly patch mechanics remains).

Yours,
Linus Walleij

Re: [PATCH v4 1/4] pinctrl: bcm: consolidate Broadcom pinctrl drivers

[Ray Jui]

Hi Linus,

On 3/4/2015 1:07 AM, Linus Walleij wrote:
> On Wed, Feb 4, 2015 at 3:09 AM, Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org> wrote:
> 
>> Consolidate Broadcom pinctrl drivers into drivers/pinctrl/bcm/*
>>
>> Signed-off-by: Ray Jui <rjui-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
> 
> This patch doesn't apply so it needs to be rebased on v4.0-rc1 and resent.
> 
> And also when just moving files, always do this:
> 
> git format-patch -M ...
> 
> So that file movement is detected, and the patch will apply nicely even
> if the contents of the file(s) have changed.
> 
> Can you also combine this series with the v9 GPIO etc series and
> send out ONE big patch set that I can look at because right now I'm
> getting really confused ...
> 
> I'll look over the rest and see if there is some remaining technical
> comments (hopefully mainly patch mechanics remains).
> 
> Yours,
> Linus Walleij
> 

Okay. I'll rebase to v4.0-rc1 and consolidate both pinmux and gpio
pinctrl patch series into one, which will be PATCH v5.

Thanks,

Ray
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: [PATCH v4 1/4] pinctrl: bcm: consolidate Broadcom pinctrl drivers

[Ray Jui]

Hi Linus,

On 3/4/2015 1:07 AM, Linus Walleij wrote:
> On Wed, Feb 4, 2015 at 3:09 AM, Ray Jui <rjui@broadcom.com> wrote:
> 
>> Consolidate Broadcom pinctrl drivers into drivers/pinctrl/bcm/*
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
> 
> This patch doesn't apply so it needs to be rebased on v4.0-rc1 and resent.
> 
> And also when just moving files, always do this:
> 
> git format-patch -M ...
> 
> So that file movement is detected, and the patch will apply nicely even
> if the contents of the file(s) have changed.
> 
> Can you also combine this series with the v9 GPIO etc series and
> send out ONE big patch set that I can look at because right now I'm
> getting really confused ...
> 
> I'll look over the rest and see if there is some remaining technical
> comments (hopefully mainly patch mechanics remains).
> 
> Yours,
> Linus Walleij
> 

Okay. I'll rebase to v4.0-rc1 and consolidate both pinmux and gpio
pinctrl patch series into one, which will be PATCH v5.

Thanks,

Ray

[PATCH v4 1/4] pinctrl: bcm: consolidate Broadcom pinctrl drivers

[Ray Jui]

Hi Linus,

On 3/4/2015 1:07 AM, Linus Walleij wrote:
> On Wed, Feb 4, 2015 at 3:09 AM, Ray Jui <rjui@broadcom.com> wrote:
> 
>> Consolidate Broadcom pinctrl drivers into drivers/pinctrl/bcm/*
>>
>> Signed-off-by: Ray Jui <rjui@broadcom.com>
> 
> This patch doesn't apply so it needs to be rebased on v4.0-rc1 and resent.
> 
> And also when just moving files, always do this:
> 
> git format-patch -M ...
> 
> So that file movement is detected, and the patch will apply nicely even
> if the contents of the file(s) have changed.
> 
> Can you also combine this series with the v9 GPIO etc series and
> send out ONE big patch set that I can look at because right now I'm
> getting really confused ...
> 
> I'll look over the rest and see if there is some remaining technical
> comments (hopefully mainly patch mechanics remains).
> 
> Yours,
> Linus Walleij
> 

Okay. I'll rebase to v4.0-rc1 and consolidate both pinmux and gpio
pinctrl patch series into one, which will be PATCH v5.

Thanks,

Ray

Re: [PATCH v5 1/6] clk: add of_clk_get_parent_rate function

[Mike Turquette]

Quoting Sascha Hauer (2015-02-26 00:43:19)
> On Wed, Feb 25, 2015 at 11:42:44PM -0800, Ray Jui wrote:
> > On 2/25/2015 10:51 PM, Sascha Hauer wrote:
> > > On Wed, Feb 25, 2015 at 10:13:15PM -0800, Ray Jui wrote:
> > >> Hi Sascha,
> > >>
> > >> On 2/25/2015 9:54 PM, Sascha Hauer wrote:
> > >>> Hi Ray,
> > >>>
> > >>> On Wed, Feb 04, 2015 at 04:55:00PM -0800, Ray Jui wrote:
> > >>>> Sometimes a clock needs to know the rate of its parent before itself is
> > >>>> registered to the framework. An example is that a PLL may need to
> > >>>> initialize itself to a specific VCO frequency, before registering to the
> > >>>> framework. The parent rate needs to be known, for PLL multipliers and
> > >>>> divisors to be configured properly.
> > >>>>
> > >>>> Introduce helper function of_clk_get_parent_rate, which can be used to
> > >>>> obtain the parent rate of a clock, given a device node and index.
> > >>>
> > >>> I can't see how this patch helps you. First it's not guaranteed that
> > >>> the parent is already registered, what do you do in this case?
> > >>
> > >> In the case when clock parent is not found, as you can see from the
> > >> code, it simply returns zero, just like other clk get rate APIs.
> > > 
> > > Yes, but what do you do with the 0 result then in your PLL initialization?
> > > 
> > 
> > As of the current code, it fails the PLL frequency initialization and
> > bails out. Thinking about it more, it actually makes more sense to just
> > warn and still go ahead to register the clock, in which case it will use
> > whatever default frequency after chip power on reset or a frequency
> > configured in the bootloader.
> > 
> > >>
> > >> I thought the order of clock registration is based on order of the clock
> > >> nodes in device tree. It makes sense to me to declare the parent clock
> > >> before a child clock, so it's guaranteed that the parent is registered
> > >> before the child.
> > > 
> > > No, you can't rely on that. The order of the device nodes may happen to
> > > define the order of clock initialization now, but that may change.
> > > device nodes are usually ordered by bus addresses, not by intended
> > > initialization order. Even if you reorder them everything must still
> > > work.
> > > 
> > 
> > Okay I get your point that the order of device nodes may not be relied
> > on for device initialization order. But then another mechanism should be
> > deployed to give developers the option to decide on the clock
> > initialization sequence. It can be optional but it should be there.
> > 
> > >>
> > >>> Then the clock framework doesn't require that you initialize the PLL
> > >>> before registering. That can be done in the clk ops later.
> > >>
> > >> Sure it's not mandatory. But what's wrong with me choosing to initialize
> > >> the PLL clock to a known frequency before registering it to the framework?
> > > 
> > > Appearantly you don't know the (input) frequency of the PLL when
> > > registering it to the framework, so the question must be: What's wrong
> > > with keeping it uninitialized?
> > > 
> > > If the PLL is unused then you don't care about it's initialization
> > > status. If it happens to be enabled by a bootloader and still unused
> > > at late_initcall time the clock framework will disable it so you
> > > have a known state then. If a consumer for the PLL appears it's its
> > > job to initialize it through the clk api.
> > > 
> > > Sascha
> > > 
> > 
> > Okay, what we need here is to initialize the PLL to a desired frequency,
> > based on device tree settings (since it will be configured differently,
> > among different boards). This is a PLL that 1) has limited options of
> > frequencies which it can be configured to, and 2) has multiple child
> > clocks, where is a more suitable place to initialize it to the desired
> > frequency than right before registering it to the framework? I know a
> > lot of people do it in the bootloader, but I thought we should be given
> > the flexibility of configuring it in the kernel.
> > 
> > When you say "consumers", do you mean 1) the device driver that uses the
> > PLL; or 2) the device driver that use the child clock of the PLL? If
> > it's case 1), then we don't really have a device driver that directly
> > uses the PLL, and I thought that's quite normal, as most PLLs don't
> > directly feed into any peripherals.
> 
> I meant 1) and 2). Before a consumer comes along the state of the PLL
> doesn't matter. When a consumer shows up it has to call
> clk_prepare_enable which (directly or indirectly) will enable your PLL.
> Then it's still time to apply the default settings you found out during
> probe of the PLL.

My review comments are really for iproc_pll_setup() in patch #3, but the
discussion is here so I'll respond to this thread.

I think the root of this problem is that your pll clk_ops does not
support .set_rate. That is why your clock driver hacks in a call to
pll_set_rate in iproc_pll_setup.

Due to the above shortcoming you also do not use the assigned-clock-rate
infrastructure to set your pll rate at registration-time. There is no
reason for your driver to re-invent this logic. iproc_pll_setup is
fetching the clock-frequency property from DT and then trying to set
that rate. Instead please use the generic code.

The right way to handle this is to support a .set_rate callback (looks
like you're 90% of the way there with pll_set_rate) and then use the
assigned-clock-rates property to specify this from DT.

Regards,
Mike

> 
> Sascha
> 
> -- 
> Pengutronix e.K.                           |                             |
> Industrial Linux Solutions                 | http://www.pengutronix.de/  |
> Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
> Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

[PATCH v5 1/6] clk: add of_clk_get_parent_rate function

[Mike Turquette]

Quoting Sascha Hauer (2015-02-26 00:43:19)
> On Wed, Feb 25, 2015 at 11:42:44PM -0800, Ray Jui wrote:
> > On 2/25/2015 10:51 PM, Sascha Hauer wrote:
> > > On Wed, Feb 25, 2015 at 10:13:15PM -0800, Ray Jui wrote:
> > >> Hi Sascha,
> > >>
> > >> On 2/25/2015 9:54 PM, Sascha Hauer wrote:
> > >>> Hi Ray,
> > >>>
> > >>> On Wed, Feb 04, 2015 at 04:55:00PM -0800, Ray Jui wrote:
> > >>>> Sometimes a clock needs to know the rate of its parent before itself is
> > >>>> registered to the framework. An example is that a PLL may need to
> > >>>> initialize itself to a specific VCO frequency, before registering to the
> > >>>> framework. The parent rate needs to be known, for PLL multipliers and
> > >>>> divisors to be configured properly.
> > >>>>
> > >>>> Introduce helper function of_clk_get_parent_rate, which can be used to
> > >>>> obtain the parent rate of a clock, given a device node and index.
> > >>>
> > >>> I can't see how this patch helps you. First it's not guaranteed that
> > >>> the parent is already registered, what do you do in this case?
> > >>
> > >> In the case when clock parent is not found, as you can see from the
> > >> code, it simply returns zero, just like other clk get rate APIs.
> > > 
> > > Yes, but what do you do with the 0 result then in your PLL initialization?
> > > 
> > 
> > As of the current code, it fails the PLL frequency initialization and
> > bails out. Thinking about it more, it actually makes more sense to just
> > warn and still go ahead to register the clock, in which case it will use
> > whatever default frequency after chip power on reset or a frequency
> > configured in the bootloader.
> > 
> > >>
> > >> I thought the order of clock registration is based on order of the clock
> > >> nodes in device tree. It makes sense to me to declare the parent clock
> > >> before a child clock, so it's guaranteed that the parent is registered
> > >> before the child.
> > > 
> > > No, you can't rely on that. The order of the device nodes may happen to
> > > define the order of clock initialization now, but that may change.
> > > device nodes are usually ordered by bus addresses, not by intended
> > > initialization order. Even if you reorder them everything must still
> > > work.
> > > 
> > 
> > Okay I get your point that the order of device nodes may not be relied
> > on for device initialization order. But then another mechanism should be
> > deployed to give developers the option to decide on the clock
> > initialization sequence. It can be optional but it should be there.
> > 
> > >>
> > >>> Then the clock framework doesn't require that you initialize the PLL
> > >>> before registering. That can be done in the clk ops later.
> > >>
> > >> Sure it's not mandatory. But what's wrong with me choosing to initialize
> > >> the PLL clock to a known frequency before registering it to the framework?
> > > 
> > > Appearantly you don't know the (input) frequency of the PLL when
> > > registering it to the framework, so the question must be: What's wrong
> > > with keeping it uninitialized?
> > > 
> > > If the PLL is unused then you don't care about it's initialization
> > > status. If it happens to be enabled by a bootloader and still unused
> > > at late_initcall time the clock framework will disable it so you
> > > have a known state then. If a consumer for the PLL appears it's its
> > > job to initialize it through the clk api.
> > > 
> > > Sascha
> > > 
> > 
> > Okay, what we need here is to initialize the PLL to a desired frequency,
> > based on device tree settings (since it will be configured differently,
> > among different boards). This is a PLL that 1) has limited options of
> > frequencies which it can be configured to, and 2) has multiple child
> > clocks, where is a more suitable place to initialize it to the desired
> > frequency than right before registering it to the framework? I know a
> > lot of people do it in the bootloader, but I thought we should be given
> > the flexibility of configuring it in the kernel.
> > 
> > When you say "consumers", do you mean 1) the device driver that uses the
> > PLL; or 2) the device driver that use the child clock of the PLL? If
> > it's case 1), then we don't really have a device driver that directly
> > uses the PLL, and I thought that's quite normal, as most PLLs don't
> > directly feed into any peripherals.
> 
> I meant 1) and 2). Before a consumer comes along the state of the PLL
> doesn't matter. When a consumer shows up it has to call
> clk_prepare_enable which (directly or indirectly) will enable your PLL.
> Then it's still time to apply the default settings you found out during
> probe of the PLL.

My review comments are really for iproc_pll_setup() in patch #3, but the
discussion is here so I'll respond to this thread.

I think the root of this problem is that your pll clk_ops does not
support .set_rate. That is why your clock driver hacks in a call to
pll_set_rate in iproc_pll_setup.

Due to the above shortcoming you also do not use the assigned-clock-rate
infrastructure to set your pll rate at registration-time. There is no
reason for your driver to re-invent this logic. iproc_pll_setup is
fetching the clock-frequency property from DT and then trying to set
that rate. Instead please use the generic code.

The right way to handle this is to support a .set_rate callback (looks
like you're 90% of the way there with pll_set_rate) and then use the
assigned-clock-rates property to specify this from DT.

Regards,
Mike

> 
> Sascha
> 
> -- 
> Pengutronix e.K.                           |                             |
> Industrial Linux Solutions                 | http://www.pengutronix.de/  |
> Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
> Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

Re: [PATCH v5 1/6] clk: add of_clk_get_parent_rate function

[Ray Jui]

Hi Mike,

On 3/6/2015 11:55 AM, Mike Turquette wrote:
> Quoting Sascha Hauer (2015-02-26 00:43:19)
>> On Wed, Feb 25, 2015 at 11:42:44PM -0800, Ray Jui wrote:
>>> On 2/25/2015 10:51 PM, Sascha Hauer wrote:
>>>> On Wed, Feb 25, 2015 at 10:13:15PM -0800, Ray Jui wrote:
>>>>> Hi Sascha,
>>>>>
>>>>> On 2/25/2015 9:54 PM, Sascha Hauer wrote:
>>>>>> Hi Ray,
>>>>>>
>>>>>> On Wed, Feb 04, 2015 at 04:55:00PM -0800, Ray Jui wrote:
>>>>>>> Sometimes a clock needs to know the rate of its parent before itself is
>>>>>>> registered to the framework. An example is that a PLL may need to
>>>>>>> initialize itself to a specific VCO frequency, before registering to the
>>>>>>> framework. The parent rate needs to be known, for PLL multipliers and
>>>>>>> divisors to be configured properly.
>>>>>>>
>>>>>>> Introduce helper function of_clk_get_parent_rate, which can be used to
>>>>>>> obtain the parent rate of a clock, given a device node and index.
>>>>>>
>>>>>> I can't see how this patch helps you. First it's not guaranteed that
>>>>>> the parent is already registered, what do you do in this case?
>>>>>
>>>>> In the case when clock parent is not found, as you can see from the
>>>>> code, it simply returns zero, just like other clk get rate APIs.
>>>>
>>>> Yes, but what do you do with the 0 result then in your PLL initialization?
>>>>
>>>
>>> As of the current code, it fails the PLL frequency initialization and
>>> bails out. Thinking about it more, it actually makes more sense to just
>>> warn and still go ahead to register the clock, in which case it will use
>>> whatever default frequency after chip power on reset or a frequency
>>> configured in the bootloader.
>>>
>>>>>
>>>>> I thought the order of clock registration is based on order of the clock
>>>>> nodes in device tree. It makes sense to me to declare the parent clock
>>>>> before a child clock, so it's guaranteed that the parent is registered
>>>>> before the child.
>>>>
>>>> No, you can't rely on that. The order of the device nodes may happen to
>>>> define the order of clock initialization now, but that may change.
>>>> device nodes are usually ordered by bus addresses, not by intended
>>>> initialization order. Even if you reorder them everything must still
>>>> work.
>>>>
>>>
>>> Okay I get your point that the order of device nodes may not be relied
>>> on for device initialization order. But then another mechanism should be
>>> deployed to give developers the option to decide on the clock
>>> initialization sequence. It can be optional but it should be there.
>>>
>>>>>
>>>>>> Then the clock framework doesn't require that you initialize the PLL
>>>>>> before registering. That can be done in the clk ops later.
>>>>>
>>>>> Sure it's not mandatory. But what's wrong with me choosing to initialize
>>>>> the PLL clock to a known frequency before registering it to the framework?
>>>>
>>>> Appearantly you don't know the (input) frequency of the PLL when
>>>> registering it to the framework, so the question must be: What's wrong
>>>> with keeping it uninitialized?
>>>>
>>>> If the PLL is unused then you don't care about it's initialization
>>>> status. If it happens to be enabled by a bootloader and still unused
>>>> at late_initcall time the clock framework will disable it so you
>>>> have a known state then. If a consumer for the PLL appears it's its
>>>> job to initialize it through the clk api.
>>>>
>>>> Sascha
>>>>
>>>
>>> Okay, what we need here is to initialize the PLL to a desired frequency,
>>> based on device tree settings (since it will be configured differently,
>>> among different boards). This is a PLL that 1) has limited options of
>>> frequencies which it can be configured to, and 2) has multiple child
>>> clocks, where is a more suitable place to initialize it to the desired
>>> frequency than right before registering it to the framework? I know a
>>> lot of people do it in the bootloader, but I thought we should be given
>>> the flexibility of configuring it in the kernel.
>>>
>>> When you say "consumers", do you mean 1) the device driver that uses the
>>> PLL; or 2) the device driver that use the child clock of the PLL? If
>>> it's case 1), then we don't really have a device driver that directly
>>> uses the PLL, and I thought that's quite normal, as most PLLs don't
>>> directly feed into any peripherals.
>>
>> I meant 1) and 2). Before a consumer comes along the state of the PLL
>> doesn't matter. When a consumer shows up it has to call
>> clk_prepare_enable which (directly or indirectly) will enable your PLL.
>> Then it's still time to apply the default settings you found out during
>> probe of the PLL.
> 
> My review comments are really for iproc_pll_setup() in patch #3, but the
> discussion is here so I'll respond to this thread.
> 
> I think the root of this problem is that your pll clk_ops does not
> support .set_rate. That is why your clock driver hacks in a call to
> pll_set_rate in iproc_pll_setup.
> 
> Due to the above shortcoming you also do not use the assigned-clock-rate
> infrastructure to set your pll rate at registration-time. There is no
> reason for your driver to re-invent this logic. iproc_pll_setup is
> fetching the clock-frequency property from DT and then trying to set
> that rate. Instead please use the generic code.
> 
> The right way to handle this is to support a .set_rate callback (looks
> like you're 90% of the way there with pll_set_rate) and then use the
> assigned-clock-rates property to specify this from DT.
> 
> Regards,
> Mike
> 

Okay. It's good to know that "assigned-clock-rate" can be used and serve
exactly what we need here. I'll update my patch series to use that instead.

In this case, do you think I should still keep of_clk_get_parent_rate in
the patch series?

Thanks,

Ray

>>
>> Sascha
>>
>> -- 
>> Pengutronix e.K.                           |                             |
>> Industrial Linux Solutions                 | http://www.pengutronix.de/  |
>> Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
>> Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

Re: [PATCH v5 1/6] clk: add of_clk_get_parent_rate function

[Ray Jui]

Hi Mike,

On 3/6/2015 11:55 AM, Mike Turquette wrote:
> Quoting Sascha Hauer (2015-02-26 00:43:19)
>> On Wed, Feb 25, 2015 at 11:42:44PM -0800, Ray Jui wrote:
>>> On 2/25/2015 10:51 PM, Sascha Hauer wrote:
>>>> On Wed, Feb 25, 2015 at 10:13:15PM -0800, Ray Jui wrote:
>>>>> Hi Sascha,
>>>>>
>>>>> On 2/25/2015 9:54 PM, Sascha Hauer wrote:
>>>>>> Hi Ray,
>>>>>>
>>>>>> On Wed, Feb 04, 2015 at 04:55:00PM -0800, Ray Jui wrote:
>>>>>>> Sometimes a clock needs to know the rate of its parent before itself is
>>>>>>> registered to the framework. An example is that a PLL may need to
>>>>>>> initialize itself to a specific VCO frequency, before registering to the
>>>>>>> framework. The parent rate needs to be known, for PLL multipliers and
>>>>>>> divisors to be configured properly.
>>>>>>>
>>>>>>> Introduce helper function of_clk_get_parent_rate, which can be used to
>>>>>>> obtain the parent rate of a clock, given a device node and index.
>>>>>>
>>>>>> I can't see how this patch helps you. First it's not guaranteed that
>>>>>> the parent is already registered, what do you do in this case?
>>>>>
>>>>> In the case when clock parent is not found, as you can see from the
>>>>> code, it simply returns zero, just like other clk get rate APIs.
>>>>
>>>> Yes, but what do you do with the 0 result then in your PLL initialization?
>>>>
>>>
>>> As of the current code, it fails the PLL frequency initialization and
>>> bails out. Thinking about it more, it actually makes more sense to just
>>> warn and still go ahead to register the clock, in which case it will use
>>> whatever default frequency after chip power on reset or a frequency
>>> configured in the bootloader.
>>>
>>>>>
>>>>> I thought the order of clock registration is based on order of the clock
>>>>> nodes in device tree. It makes sense to me to declare the parent clock
>>>>> before a child clock, so it's guaranteed that the parent is registered
>>>>> before the child.
>>>>
>>>> No, you can't rely on that. The order of the device nodes may happen to
>>>> define the order of clock initialization now, but that may change.
>>>> device nodes are usually ordered by bus addresses, not by intended
>>>> initialization order. Even if you reorder them everything must still
>>>> work.
>>>>
>>>
>>> Okay I get your point that the order of device nodes may not be relied
>>> on for device initialization order. But then another mechanism should be
>>> deployed to give developers the option to decide on the clock
>>> initialization sequence. It can be optional but it should be there.
>>>
>>>>>
>>>>>> Then the clock framework doesn't require that you initialize the PLL
>>>>>> before registering. That can be done in the clk ops later.
>>>>>
>>>>> Sure it's not mandatory. But what's wrong with me choosing to initialize
>>>>> the PLL clock to a known frequency before registering it to the framework?
>>>>
>>>> Appearantly you don't know the (input) frequency of the PLL when
>>>> registering it to the framework, so the question must be: What's wrong
>>>> with keeping it uninitialized?
>>>>
>>>> If the PLL is unused then you don't care about it's initialization
>>>> status. If it happens to be enabled by a bootloader and still unused
>>>> at late_initcall time the clock framework will disable it so you
>>>> have a known state then. If a consumer for the PLL appears it's its
>>>> job to initialize it through the clk api.
>>>>
>>>> Sascha
>>>>
>>>
>>> Okay, what we need here is to initialize the PLL to a desired frequency,
>>> based on device tree settings (since it will be configured differently,
>>> among different boards). This is a PLL that 1) has limited options of
>>> frequencies which it can be configured to, and 2) has multiple child
>>> clocks, where is a more suitable place to initialize it to the desired
>>> frequency than right before registering it to the framework? I know a
>>> lot of people do it in the bootloader, but I thought we should be given
>>> the flexibility of configuring it in the kernel.
>>>
>>> When you say "consumers", do you mean 1) the device driver that uses the
>>> PLL; or 2) the device driver that use the child clock of the PLL? If
>>> it's case 1), then we don't really have a device driver that directly
>>> uses the PLL, and I thought that's quite normal, as most PLLs don't
>>> directly feed into any peripherals.
>>
>> I meant 1) and 2). Before a consumer comes along the state of the PLL
>> doesn't matter. When a consumer shows up it has to call
>> clk_prepare_enable which (directly or indirectly) will enable your PLL.
>> Then it's still time to apply the default settings you found out during
>> probe of the PLL.
> 
> My review comments are really for iproc_pll_setup() in patch #3, but the
> discussion is here so I'll respond to this thread.
> 
> I think the root of this problem is that your pll clk_ops does not
> support .set_rate. That is why your clock driver hacks in a call to
> pll_set_rate in iproc_pll_setup.
> 
> Due to the above shortcoming you also do not use the assigned-clock-rate
> infrastructure to set your pll rate at registration-time. There is no
> reason for your driver to re-invent this logic. iproc_pll_setup is
> fetching the clock-frequency property from DT and then trying to set
> that rate. Instead please use the generic code.
> 
> The right way to handle this is to support a .set_rate callback (looks
> like you're 90% of the way there with pll_set_rate) and then use the
> assigned-clock-rates property to specify this from DT.
> 
> Regards,
> Mike
> 

Okay. It's good to know that "assigned-clock-rate" can be used and serve
exactly what we need here. I'll update my patch series to use that instead.

In this case, do you think I should still keep of_clk_get_parent_rate in
the patch series?

Thanks,

Ray

>>
>> Sascha
>>
>> -- 
>> Pengutronix e.K.                           |                             |
>> Industrial Linux Solutions                 | http://www.pengutronix.de/  |
>> Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
>> Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |
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[PATCH v5 1/6] clk: add of_clk_get_parent_rate function

[Ray Jui]

Hi Mike,

On 3/6/2015 11:55 AM, Mike Turquette wrote:
> Quoting Sascha Hauer (2015-02-26 00:43:19)
>> On Wed, Feb 25, 2015 at 11:42:44PM -0800, Ray Jui wrote:
>>> On 2/25/2015 10:51 PM, Sascha Hauer wrote:
>>>> On Wed, Feb 25, 2015 at 10:13:15PM -0800, Ray Jui wrote:
>>>>> Hi Sascha,
>>>>>
>>>>> On 2/25/2015 9:54 PM, Sascha Hauer wrote:
>>>>>> Hi Ray,
>>>>>>
>>>>>> On Wed, Feb 04, 2015 at 04:55:00PM -0800, Ray Jui wrote:
>>>>>>> Sometimes a clock needs to know the rate of its parent before itself is
>>>>>>> registered to the framework. An example is that a PLL may need to
>>>>>>> initialize itself to a specific VCO frequency, before registering to the
>>>>>>> framework. The parent rate needs to be known, for PLL multipliers and
>>>>>>> divisors to be configured properly.
>>>>>>>
>>>>>>> Introduce helper function of_clk_get_parent_rate, which can be used to
>>>>>>> obtain the parent rate of a clock, given a device node and index.
>>>>>>
>>>>>> I can't see how this patch helps you. First it's not guaranteed that
>>>>>> the parent is already registered, what do you do in this case?
>>>>>
>>>>> In the case when clock parent is not found, as you can see from the
>>>>> code, it simply returns zero, just like other clk get rate APIs.
>>>>
>>>> Yes, but what do you do with the 0 result then in your PLL initialization?
>>>>
>>>
>>> As of the current code, it fails the PLL frequency initialization and
>>> bails out. Thinking about it more, it actually makes more sense to just
>>> warn and still go ahead to register the clock, in which case it will use
>>> whatever default frequency after chip power on reset or a frequency
>>> configured in the bootloader.
>>>
>>>>>
>>>>> I thought the order of clock registration is based on order of the clock
>>>>> nodes in device tree. It makes sense to me to declare the parent clock
>>>>> before a child clock, so it's guaranteed that the parent is registered
>>>>> before the child.
>>>>
>>>> No, you can't rely on that. The order of the device nodes may happen to
>>>> define the order of clock initialization now, but that may change.
>>>> device nodes are usually ordered by bus addresses, not by intended
>>>> initialization order. Even if you reorder them everything must still
>>>> work.
>>>>
>>>
>>> Okay I get your point that the order of device nodes may not be relied
>>> on for device initialization order. But then another mechanism should be
>>> deployed to give developers the option to decide on the clock
>>> initialization sequence. It can be optional but it should be there.
>>>
>>>>>
>>>>>> Then the clock framework doesn't require that you initialize the PLL
>>>>>> before registering. That can be done in the clk ops later.
>>>>>
>>>>> Sure it's not mandatory. But what's wrong with me choosing to initialize
>>>>> the PLL clock to a known frequency before registering it to the framework?
>>>>
>>>> Appearantly you don't know the (input) frequency of the PLL when
>>>> registering it to the framework, so the question must be: What's wrong
>>>> with keeping it uninitialized?
>>>>
>>>> If the PLL is unused then you don't care about it's initialization
>>>> status. If it happens to be enabled by a bootloader and still unused
>>>> at late_initcall time the clock framework will disable it so you
>>>> have a known state then. If a consumer for the PLL appears it's its
>>>> job to initialize it through the clk api.
>>>>
>>>> Sascha
>>>>
>>>
>>> Okay, what we need here is to initialize the PLL to a desired frequency,
>>> based on device tree settings (since it will be configured differently,
>>> among different boards). This is a PLL that 1) has limited options of
>>> frequencies which it can be configured to, and 2) has multiple child
>>> clocks, where is a more suitable place to initialize it to the desired
>>> frequency than right before registering it to the framework? I know a
>>> lot of people do it in the bootloader, but I thought we should be given
>>> the flexibility of configuring it in the kernel.
>>>
>>> When you say "consumers", do you mean 1) the device driver that uses the
>>> PLL; or 2) the device driver that use the child clock of the PLL? If
>>> it's case 1), then we don't really have a device driver that directly
>>> uses the PLL, and I thought that's quite normal, as most PLLs don't
>>> directly feed into any peripherals.
>>
>> I meant 1) and 2). Before a consumer comes along the state of the PLL
>> doesn't matter. When a consumer shows up it has to call
>> clk_prepare_enable which (directly or indirectly) will enable your PLL.
>> Then it's still time to apply the default settings you found out during
>> probe of the PLL.
> 
> My review comments are really for iproc_pll_setup() in patch #3, but the
> discussion is here so I'll respond to this thread.
> 
> I think the root of this problem is that your pll clk_ops does not
> support .set_rate. That is why your clock driver hacks in a call to
> pll_set_rate in iproc_pll_setup.
> 
> Due to the above shortcoming you also do not use the assigned-clock-rate
> infrastructure to set your pll rate at registration-time. There is no
> reason for your driver to re-invent this logic. iproc_pll_setup is
> fetching the clock-frequency property from DT and then trying to set
> that rate. Instead please use the generic code.
> 
> The right way to handle this is to support a .set_rate callback (looks
> like you're 90% of the way there with pll_set_rate) and then use the
> assigned-clock-rates property to specify this from DT.
> 
> Regards,
> Mike
> 

Okay. It's good to know that "assigned-clock-rate" can be used and serve
exactly what we need here. I'll update my patch series to use that instead.

In this case, do you think I should still keep of_clk_get_parent_rate in
the patch series?

Thanks,

Ray

>>
>> Sascha
>>
>> -- 
>> Pengutronix e.K.                           |                             |
>> Industrial Linux Solutions                 | http://www.pengutronix.de/  |
>> Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
>> Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

Re: [PATCH v5 1/6] clk: add of_clk_get_parent_rate function

[Mike Turquette]

Quoting Ray Jui (2015-03-06 12:07:13)
> Hi Mike,
> 
> On 3/6/2015 11:55 AM, Mike Turquette wrote:
> > Quoting Sascha Hauer (2015-02-26 00:43:19)
> >> On Wed, Feb 25, 2015 at 11:42:44PM -0800, Ray Jui wrote:
> >>> On 2/25/2015 10:51 PM, Sascha Hauer wrote:
> >>>> On Wed, Feb 25, 2015 at 10:13:15PM -0800, Ray Jui wrote:
> >>>>> Hi Sascha,
> >>>>>
> >>>>> On 2/25/2015 9:54 PM, Sascha Hauer wrote:
> >>>>>> Hi Ray,
> >>>>>>
> >>>>>> On Wed, Feb 04, 2015 at 04:55:00PM -0800, Ray Jui wrote:
> >>>>>>> Sometimes a clock needs to know the rate of its parent before itself is
> >>>>>>> registered to the framework. An example is that a PLL may need to
> >>>>>>> initialize itself to a specific VCO frequency, before registering to the
> >>>>>>> framework. The parent rate needs to be known, for PLL multipliers and
> >>>>>>> divisors to be configured properly.
> >>>>>>>
> >>>>>>> Introduce helper function of_clk_get_parent_rate, which can be used to
> >>>>>>> obtain the parent rate of a clock, given a device node and index.
> >>>>>>
> >>>>>> I can't see how this patch helps you. First it's not guaranteed that
> >>>>>> the parent is already registered, what do you do in this case?
> >>>>>
> >>>>> In the case when clock parent is not found, as you can see from the
> >>>>> code, it simply returns zero, just like other clk get rate APIs.
> >>>>
> >>>> Yes, but what do you do with the 0 result then in your PLL initialization?
> >>>>
> >>>
> >>> As of the current code, it fails the PLL frequency initialization and
> >>> bails out. Thinking about it more, it actually makes more sense to just
> >>> warn and still go ahead to register the clock, in which case it will use
> >>> whatever default frequency after chip power on reset or a frequency
> >>> configured in the bootloader.
> >>>
> >>>>>
> >>>>> I thought the order of clock registration is based on order of the clock
> >>>>> nodes in device tree. It makes sense to me to declare the parent clock
> >>>>> before a child clock, so it's guaranteed that the parent is registered
> >>>>> before the child.
> >>>>
> >>>> No, you can't rely on that. The order of the device nodes may happen to
> >>>> define the order of clock initialization now, but that may change.
> >>>> device nodes are usually ordered by bus addresses, not by intended
> >>>> initialization order. Even if you reorder them everything must still
> >>>> work.
> >>>>
> >>>
> >>> Okay I get your point that the order of device nodes may not be relied
> >>> on for device initialization order. But then another mechanism should be
> >>> deployed to give developers the option to decide on the clock
> >>> initialization sequence. It can be optional but it should be there.
> >>>
> >>>>>
> >>>>>> Then the clock framework doesn't require that you initialize the PLL
> >>>>>> before registering. That can be done in the clk ops later.
> >>>>>
> >>>>> Sure it's not mandatory. But what's wrong with me choosing to initialize
> >>>>> the PLL clock to a known frequency before registering it to the framework?
> >>>>
> >>>> Appearantly you don't know the (input) frequency of the PLL when
> >>>> registering it to the framework, so the question must be: What's wrong
> >>>> with keeping it uninitialized?
> >>>>
> >>>> If the PLL is unused then you don't care about it's initialization
> >>>> status. If it happens to be enabled by a bootloader and still unused
> >>>> at late_initcall time the clock framework will disable it so you
> >>>> have a known state then. If a consumer for the PLL appears it's its
> >>>> job to initialize it through the clk api.
> >>>>
> >>>> Sascha
> >>>>
> >>>
> >>> Okay, what we need here is to initialize the PLL to a desired frequency,
> >>> based on device tree settings (since it will be configured differently,
> >>> among different boards). This is a PLL that 1) has limited options of
> >>> frequencies which it can be configured to, and 2) has multiple child
> >>> clocks, where is a more suitable place to initialize it to the desired
> >>> frequency than right before registering it to the framework? I know a
> >>> lot of people do it in the bootloader, but I thought we should be given
> >>> the flexibility of configuring it in the kernel.
> >>>
> >>> When you say "consumers", do you mean 1) the device driver that uses the
> >>> PLL; or 2) the device driver that use the child clock of the PLL? If
> >>> it's case 1), then we don't really have a device driver that directly
> >>> uses the PLL, and I thought that's quite normal, as most PLLs don't
> >>> directly feed into any peripherals.
> >>
> >> I meant 1) and 2). Before a consumer comes along the state of the PLL
> >> doesn't matter. When a consumer shows up it has to call
> >> clk_prepare_enable which (directly or indirectly) will enable your PLL.
> >> Then it's still time to apply the default settings you found out during
> >> probe of the PLL.
> > 
> > My review comments are really for iproc_pll_setup() in patch #3, but the
> > discussion is here so I'll respond to this thread.
> > 
> > I think the root of this problem is that your pll clk_ops does not
> > support .set_rate. That is why your clock driver hacks in a call to
> > pll_set_rate in iproc_pll_setup.
> > 
> > Due to the above shortcoming you also do not use the assigned-clock-rate
> > infrastructure to set your pll rate at registration-time. There is no
> > reason for your driver to re-invent this logic. iproc_pll_setup is
> > fetching the clock-frequency property from DT and then trying to set
> > that rate. Instead please use the generic code.
> > 
> > The right way to handle this is to support a .set_rate callback (looks
> > like you're 90% of the way there with pll_set_rate) and then use the
> > assigned-clock-rates property to specify this from DT.
> > 
> > Regards,
> > Mike
> > 
> 
> Okay. It's good to know that "assigned-clock-rate" can be used and serve
> exactly what we need here. I'll update my patch series to use that instead.
> 
> In this case, do you think I should still keep of_clk_get_parent_rate in
> the patch series?

No. Without a user we should drop it, and I also do not like its use of
clk_lookup.

Thanks,
Mike

> 
> Thanks,
> 
> Ray
> 
> >>
> >> Sascha
> >>
> >> -- 
> >> Pengutronix e.K.                           |                             |
> >> Industrial Linux Solutions                 | http://www.pengutronix.de/  |
> >> Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
> >> Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

[PATCH v5 1/6] clk: add of_clk_get_parent_rate function

[Mike Turquette]

Quoting Ray Jui (2015-03-06 12:07:13)
> Hi Mike,
> 
> On 3/6/2015 11:55 AM, Mike Turquette wrote:
> > Quoting Sascha Hauer (2015-02-26 00:43:19)
> >> On Wed, Feb 25, 2015 at 11:42:44PM -0800, Ray Jui wrote:
> >>> On 2/25/2015 10:51 PM, Sascha Hauer wrote:
> >>>> On Wed, Feb 25, 2015 at 10:13:15PM -0800, Ray Jui wrote:
> >>>>> Hi Sascha,
> >>>>>
> >>>>> On 2/25/2015 9:54 PM, Sascha Hauer wrote:
> >>>>>> Hi Ray,
> >>>>>>
> >>>>>> On Wed, Feb 04, 2015 at 04:55:00PM -0800, Ray Jui wrote:
> >>>>>>> Sometimes a clock needs to know the rate of its parent before itself is
> >>>>>>> registered to the framework. An example is that a PLL may need to
> >>>>>>> initialize itself to a specific VCO frequency, before registering to the
> >>>>>>> framework. The parent rate needs to be known, for PLL multipliers and
> >>>>>>> divisors to be configured properly.
> >>>>>>>
> >>>>>>> Introduce helper function of_clk_get_parent_rate, which can be used to
> >>>>>>> obtain the parent rate of a clock, given a device node and index.
> >>>>>>
> >>>>>> I can't see how this patch helps you. First it's not guaranteed that
> >>>>>> the parent is already registered, what do you do in this case?
> >>>>>
> >>>>> In the case when clock parent is not found, as you can see from the
> >>>>> code, it simply returns zero, just like other clk get rate APIs.
> >>>>
> >>>> Yes, but what do you do with the 0 result then in your PLL initialization?
> >>>>
> >>>
> >>> As of the current code, it fails the PLL frequency initialization and
> >>> bails out. Thinking about it more, it actually makes more sense to just
> >>> warn and still go ahead to register the clock, in which case it will use
> >>> whatever default frequency after chip power on reset or a frequency
> >>> configured in the bootloader.
> >>>
> >>>>>
> >>>>> I thought the order of clock registration is based on order of the clock
> >>>>> nodes in device tree. It makes sense to me to declare the parent clock
> >>>>> before a child clock, so it's guaranteed that the parent is registered
> >>>>> before the child.
> >>>>
> >>>> No, you can't rely on that. The order of the device nodes may happen to
> >>>> define the order of clock initialization now, but that may change.
> >>>> device nodes are usually ordered by bus addresses, not by intended
> >>>> initialization order. Even if you reorder them everything must still
> >>>> work.
> >>>>
> >>>
> >>> Okay I get your point that the order of device nodes may not be relied
> >>> on for device initialization order. But then another mechanism should be
> >>> deployed to give developers the option to decide on the clock
> >>> initialization sequence. It can be optional but it should be there.
> >>>
> >>>>>
> >>>>>> Then the clock framework doesn't require that you initialize the PLL
> >>>>>> before registering. That can be done in the clk ops later.
> >>>>>
> >>>>> Sure it's not mandatory. But what's wrong with me choosing to initialize
> >>>>> the PLL clock to a known frequency before registering it to the framework?
> >>>>
> >>>> Appearantly you don't know the (input) frequency of the PLL when
> >>>> registering it to the framework, so the question must be: What's wrong
> >>>> with keeping it uninitialized?
> >>>>
> >>>> If the PLL is unused then you don't care about it's initialization
> >>>> status. If it happens to be enabled by a bootloader and still unused
> >>>> at late_initcall time the clock framework will disable it so you
> >>>> have a known state then. If a consumer for the PLL appears it's its
> >>>> job to initialize it through the clk api.
> >>>>
> >>>> Sascha
> >>>>
> >>>
> >>> Okay, what we need here is to initialize the PLL to a desired frequency,
> >>> based on device tree settings (since it will be configured differently,
> >>> among different boards). This is a PLL that 1) has limited options of
> >>> frequencies which it can be configured to, and 2) has multiple child
> >>> clocks, where is a more suitable place to initialize it to the desired
> >>> frequency than right before registering it to the framework? I know a
> >>> lot of people do it in the bootloader, but I thought we should be given
> >>> the flexibility of configuring it in the kernel.
> >>>
> >>> When you say "consumers", do you mean 1) the device driver that uses the
> >>> PLL; or 2) the device driver that use the child clock of the PLL? If
> >>> it's case 1), then we don't really have a device driver that directly
> >>> uses the PLL, and I thought that's quite normal, as most PLLs don't
> >>> directly feed into any peripherals.
> >>
> >> I meant 1) and 2). Before a consumer comes along the state of the PLL
> >> doesn't matter. When a consumer shows up it has to call
> >> clk_prepare_enable which (directly or indirectly) will enable your PLL.
> >> Then it's still time to apply the default settings you found out during
> >> probe of the PLL.
> > 
> > My review comments are really for iproc_pll_setup() in patch #3, but the
> > discussion is here so I'll respond to this thread.
> > 
> > I think the root of this problem is that your pll clk_ops does not
> > support .set_rate. That is why your clock driver hacks in a call to
> > pll_set_rate in iproc_pll_setup.
> > 
> > Due to the above shortcoming you also do not use the assigned-clock-rate
> > infrastructure to set your pll rate at registration-time. There is no
> > reason for your driver to re-invent this logic. iproc_pll_setup is
> > fetching the clock-frequency property from DT and then trying to set
> > that rate. Instead please use the generic code.
> > 
> > The right way to handle this is to support a .set_rate callback (looks
> > like you're 90% of the way there with pll_set_rate) and then use the
> > assigned-clock-rates property to specify this from DT.
> > 
> > Regards,
> > Mike
> > 
> 
> Okay. It's good to know that "assigned-clock-rate" can be used and serve
> exactly what we need here. I'll update my patch series to use that instead.
> 
> In this case, do you think I should still keep of_clk_get_parent_rate in
> the patch series?

No. Without a user we should drop it, and I also do not like its use of
clk_lookup.

Thanks,
Mike

> 
> Thanks,
> 
> Ray
> 
> >>
> >> Sascha
> >>
> >> -- 
> >> Pengutronix e.K.                           |                             |
> >> Industrial Linux Solutions                 | http://www.pengutronix.de/  |
> >> Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
> >> Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |